[PATCH v9 0/5] TI K3 M4F support on AM62 SoCs

[PATCH v9 0/5] TI K3 M4F support on AM62 SoCs

[Andrew Davis]

Hello all,

This is the continuation of the M4F RProc support series from here[0].
I'm helping out with the upstream task for Hari and so this version(v8)
is a little different than the previous(v7) postings[0]. Most notable
change I've introduced being the patches factoring out common support
from the current K3 R5 and DSP drivers have been dropped. I'd like
to do that re-factor *after* getting this driver in shape, that way
we have 3 similar drivers to factor out from vs trying to make those
changes in parallel with the series adding M4 support.

Anyway, details on our M4F subsystem can be found the
the AM62 TRM in the section on the same:

AM62x Technical Reference Manual (SPRUIV7A – MAY 2022)
https://www.ti.com/lit/pdf/SPRUIV7A

Thanks,
Andrew

[0] https://lore.kernel.org/linux-arm-kernel/20240202175538.1705-5-hnagalla@ti.com/T/

Changes for v9:
 - Fixed reserved-memory.yaml text in [1/5]
 - Split dts patch into one for SoC and one for board enable
 - Corrected DT property order and formatting [4/5][5/5]

Hari Nagalla (4):
  dt-bindings: remoteproc: k3-m4f: Add K3 AM64x SoCs
  arm64: dts: ti: k3-am62: Add M4F remoteproc node
  arm64: dts: ti: k3-am625-sk: Add M4F remoteproc node
  arm64: defconfig: Enable TI K3 M4 remoteproc driver

Martyn Welch (1):
  remoteproc: k3-m4: Add a remoteproc driver for M4F subsystem

 .../bindings/remoteproc/ti,k3-m4f-rproc.yaml  | 125 +++
 arch/arm64/boot/dts/ti/k3-am62-mcu.dtsi       |  13 +
 .../arm64/boot/dts/ti/k3-am62x-sk-common.dtsi |  19 +
 arch/arm64/configs/defconfig                  |   1 +
 drivers/remoteproc/Kconfig                    |  13 +
 drivers/remoteproc/Makefile                   |   1 +
 drivers/remoteproc/ti_k3_m4_remoteproc.c      | 785 ++++++++++++++++++
 7 files changed, 957 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/remoteproc/ti,k3-m4f-rproc.yaml
 create mode 100644 drivers/remoteproc/ti_k3_m4_remoteproc.c

-- 
2.39.2


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[PATCH v9 1/5] dt-bindings: remoteproc: k3-m4f: Add K3 AM64x SoCs

[Andrew Davis]

From: Hari Nagalla <hnagalla@ti.com>

K3 AM64x SoC has a Cortex M4F subsystem in the MCU voltage domain.
The remote processor's life cycle management and IPC mechanisms are
similar across the R5F and M4F cores from remote processor driver
point of view. However, there are subtle differences in image loading
and starting the M4F subsystems.

The YAML binding document provides the various node properties to be
configured by the consumers of the M4F subsystem.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
Signed-off-by: Hari Nagalla <hnagalla@ti.com>
Signed-off-by: Andrew Davis <afd@ti.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
---
 .../bindings/remoteproc/ti,k3-m4f-rproc.yaml  | 125 ++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/remoteproc/ti,k3-m4f-rproc.yaml

diff --git a/Documentation/devicetree/bindings/remoteproc/ti,k3-m4f-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/ti,k3-m4f-rproc.yaml
new file mode 100644
index 0000000000000..2bd0752b6ba9e
--- /dev/null
+++ b/Documentation/devicetree/bindings/remoteproc/ti,k3-m4f-rproc.yaml
@@ -0,0 +1,125 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/remoteproc/ti,k3-m4f-rproc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI K3 M4F processor subsystems
+
+maintainers:
+  - Hari Nagalla <hnagalla@ti.com>
+  - Mathieu Poirier <mathieu.poirier@linaro.org>
+
+description: |
+  Some K3 family SoCs have Arm Cortex M4F cores. AM64x is a SoC in K3
+  family with a M4F core. Typically safety oriented applications may use
+  the M4F core in isolation without an IPC. Where as some industrial and
+  home automation applications, may use the M4F core as a remote processor
+  with IPC communications.
+
+$ref: /schemas/arm/keystone/ti,k3-sci-common.yaml#
+
+properties:
+  compatible:
+    enum:
+      - ti,am64-m4fss
+
+  power-domains:
+    maxItems: 1
+
+  "#address-cells":
+    const: 2
+
+  "#size-cells":
+    const: 2
+
+  reg:
+    items:
+      - description: IRAM internal memory region
+      - description: DRAM internal memory region
+
+  reg-names:
+    items:
+      - const: iram
+      - const: dram
+
+  resets:
+    maxItems: 1
+
+  firmware-name:
+    maxItems: 1
+    description: Name of firmware to load for the M4F core
+
+  mboxes:
+    description:
+      OMAP Mailbox specifier denoting the sub-mailbox, to be used for
+      communication with the remote processor. This property should match
+      with the sub-mailbox node used in the firmware image.
+    maxItems: 1
+
+  memory-region:
+    description:
+      phandle to the reserved memory nodes to be associated with the
+      remoteproc device. Optional memory regions available for firmware
+      specific purposes.
+      (see reserved-memory/reserved-memory.yaml in dtschema project)
+    maxItems: 8
+    items:
+      - description: regions used for DMA allocations like vrings, vring buffers
+                     and memory dedicated to firmware's specific purposes.
+    additionalItems: true
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - ti,sci
+  - ti,sci-dev-id
+  - ti,sci-proc-ids
+  - resets
+  - firmware-name
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    reserved-memory {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        mcu_m4fss_dma_memory_region: m4f-dma-memory@9cb00000 {
+            compatible = "shared-dma-pool";
+            reg = <0x00 0x9cb00000 0x00 0x100000>;
+            no-map;
+        };
+
+        mcu_m4fss_memory_region: m4f-memory@9cc00000 {
+            compatible = "shared-dma-pool";
+            reg = <0x00 0x9cc00000 0x00 0xe00000>;
+            no-map;
+        };
+    };
+
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        mailbox0_cluster0: mailbox-0 {
+            #mbox-cells = <1>;
+        };
+
+        remoteproc@5000000 {
+            compatible = "ti,am64-m4fss";
+            reg = <0x00 0x5000000 0x00 0x30000>,
+                  <0x00 0x5040000 0x00 0x10000>;
+            reg-names = "iram", "dram";
+            resets = <&k3_reset 9 1>;
+            firmware-name = "am62-mcu-m4f0_0-fw";
+            mboxes = <&mailbox0_cluster0>, <&mbox_m4_0>;
+            memory-region = <&mcu_m4fss_dma_memory_region>,
+                            <&mcu_m4fss_memory_region>;
+            ti,sci = <&dmsc>;
+            ti,sci-dev-id = <9>;
+            ti,sci-proc-ids = <0x18 0xff>;
+         };
+    };
-- 
2.39.2


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[PATCH v9 2/5] remoteproc: k3-m4: Add a remoteproc driver for M4F subsystem

[Andrew Davis]

From: Martyn Welch <martyn.welch@collabora.com>

The AM62x and AM64x SoCs of the TI K3 family has a Cortex M4F core in
the MCU domain. This core is typically used for safety applications in a
stand alone mode. However, some application (non safety related) may
want to use the M4F core as a generic remote processor with IPC to the
host processor. The M4F core has internal IRAM and DRAM memories and are
exposed to the system bus for code and data loading.

A remote processor driver is added to support this subsystem, including
being able to load and boot the M4F core. Loading includes to M4F
internal memories and predefined external code/data memories. The
carve outs for external contiguous memory is defined in the M4F device
node and should match with the external memory declarations in the M4F
image binary. The M4F subsystem has two resets. One reset is for the
entire subsystem i.e including the internal memories and the other, a
local reset is only for the M4F processing core. When loading the image,
the driver first releases the subsystem reset, loads the firmware image
and then releases the local reset to let the M4F processing core run.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
Signed-off-by: Hari Nagalla <hnagalla@ti.com>
Signed-off-by: Andrew Davis <afd@ti.com>
---
 drivers/remoteproc/Kconfig               |  13 +
 drivers/remoteproc/Makefile              |   1 +
 drivers/remoteproc/ti_k3_m4_remoteproc.c | 785 +++++++++++++++++++++++
 3 files changed, 799 insertions(+)
 create mode 100644 drivers/remoteproc/ti_k3_m4_remoteproc.c

diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index 48845dc8fa852..1a7c0330c91a9 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -339,6 +339,19 @@ config TI_K3_DSP_REMOTEPROC
 	  It's safe to say N here if you're not interested in utilizing
 	  the DSP slave processors.
 
+config TI_K3_M4_REMOTEPROC
+	tristate "TI K3 M4 remoteproc support"
+	depends on ARCH_K3 || COMPILE_TEST
+	select MAILBOX
+	select OMAP2PLUS_MBOX
+	help
+	  Say m here to support TI's M4 remote processor subsystems
+	  on various TI K3 family of SoCs through the remote processor
+	  framework.
+
+	  It's safe to say N here if you're not interested in utilizing
+	  a remote processor.
+
 config TI_K3_R5_REMOTEPROC
 	tristate "TI K3 R5 remoteproc support"
 	depends on ARCH_K3
diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
index 91314a9b43cef..5ff4e2fee4abd 100644
--- a/drivers/remoteproc/Makefile
+++ b/drivers/remoteproc/Makefile
@@ -37,5 +37,6 @@ obj-$(CONFIG_ST_REMOTEPROC)		+= st_remoteproc.o
 obj-$(CONFIG_ST_SLIM_REMOTEPROC)	+= st_slim_rproc.o
 obj-$(CONFIG_STM32_RPROC)		+= stm32_rproc.o
 obj-$(CONFIG_TI_K3_DSP_REMOTEPROC)	+= ti_k3_dsp_remoteproc.o
+obj-$(CONFIG_TI_K3_M4_REMOTEPROC)	+= ti_k3_m4_remoteproc.o
 obj-$(CONFIG_TI_K3_R5_REMOTEPROC)	+= ti_k3_r5_remoteproc.o
 obj-$(CONFIG_XLNX_R5_REMOTEPROC)	+= xlnx_r5_remoteproc.o
diff --git a/drivers/remoteproc/ti_k3_m4_remoteproc.c b/drivers/remoteproc/ti_k3_m4_remoteproc.c
new file mode 100644
index 0000000000000..0030e509f6b5d
--- /dev/null
+++ b/drivers/remoteproc/ti_k3_m4_remoteproc.c
@@ -0,0 +1,785 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * TI K3 Cortex-M4 Remote Processor(s) driver
+ *
+ * Copyright (C) 2021-2024 Texas Instruments Incorporated - https://www.ti.com/
+ *	Hari Nagalla <hnagalla@ti.com>
+ */
+
+#include <linux/io.h>
+#include <linux/mailbox_client.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_reserved_mem.h>
+#include <linux/platform_device.h>
+#include <linux/remoteproc.h>
+#include <linux/reset.h>
+#include <linux/slab.h>
+
+#include "omap_remoteproc.h"
+#include "remoteproc_internal.h"
+#include "ti_sci_proc.h"
+
+/**
+ * struct k3_m4_rproc_mem - internal memory structure
+ * @cpu_addr: MPU virtual address of the memory region
+ * @bus_addr: Bus address used to access the memory region
+ * @dev_addr: Device address of the memory region from remote processor view
+ * @size: Size of the memory region
+ */
+struct k3_m4_rproc_mem {
+	void __iomem *cpu_addr;
+	phys_addr_t bus_addr;
+	u32 dev_addr;
+	size_t size;
+};
+
+/**
+ * struct k3_m4_rproc_mem_data - memory definitions for a remote processor
+ * @name: name for this memory entry
+ * @dev_addr: device address for the memory entry
+ */
+struct k3_m4_rproc_mem_data {
+	const char *name;
+	const u32 dev_addr;
+};
+
+/**
+ * struct k3_m4_rproc_dev_data - device data structure for a remote processor
+ * @mems: pointer to memory definitions for a remote processor
+ * @num_mems: number of memory regions in @mems
+ * @uses_lreset: flag to denote the need for local reset management
+ */
+struct k3_m4_rproc_dev_data {
+	const struct k3_m4_rproc_mem_data *mems;
+	u32 num_mems;
+	bool uses_lreset;
+};
+
+/**
+ * struct k3_m4_rproc - k3 remote processor driver structure
+ * @dev: cached device pointer
+ * @rproc: remoteproc device handle
+ * @mem: internal memory regions data
+ * @num_mems: number of internal memory regions
+ * @rmem: reserved memory regions data
+ * @num_rmems: number of reserved memory regions
+ * @reset: reset control handle
+ * @data: pointer to device data
+ * @tsp: TI-SCI processor control handle
+ * @ti_sci: TI-SCI handle
+ * @ti_sci_id: TI-SCI device identifier
+ * @mbox: mailbox channel handle
+ * @client: mailbox client to request the mailbox channel
+ */
+struct k3_m4_rproc {
+	struct device *dev;
+	struct rproc *rproc;
+	struct k3_m4_rproc_mem *mem;
+	int num_mems;
+	struct k3_m4_rproc_mem *rmem;
+	int num_rmems;
+	struct reset_control *reset;
+	const struct k3_m4_rproc_dev_data *data;
+	struct ti_sci_proc *tsp;
+	const struct ti_sci_handle *ti_sci;
+	u32 ti_sci_id;
+	struct mbox_chan *mbox;
+	struct mbox_client client;
+};
+
+/**
+ * k3_m4_rproc_mbox_callback() - inbound mailbox message handler
+ * @client: mailbox client pointer used for requesting the mailbox channel
+ * @data: mailbox payload
+ *
+ * This handler is invoked by the K3 mailbox driver whenever a mailbox
+ * message is received. Usually, the mailbox payload simply contains
+ * the index of the virtqueue that is kicked by the remote processor,
+ * and we let remoteproc core handle it.
+ *
+ * In addition to virtqueue indices, we also have some out-of-band values
+ * that indicate different events. Those values are deliberately very
+ * large so they don't coincide with virtqueue indices.
+ */
+static void k3_m4_rproc_mbox_callback(struct mbox_client *client, void *data)
+{
+	struct k3_m4_rproc *kproc = container_of(client, struct k3_m4_rproc,
+						  client);
+	struct device *dev = kproc->rproc->dev.parent;
+	const char *name = kproc->rproc->name;
+	u32 msg = (u32)(uintptr_t)(data);
+
+	dev_dbg(dev, "mbox msg: 0x%x\n", msg);
+
+	switch (msg) {
+	case RP_MBOX_CRASH:
+		/*
+		 * remoteproc detected an exception, but error recovery is not
+		 * supported. So, just log this for now
+		 */
+		dev_err(dev, "K3 rproc %s crashed\n", name);
+		break;
+	case RP_MBOX_ECHO_REPLY:
+		dev_info(dev, "received echo reply from %s\n", name);
+		break;
+	default:
+		/* silently handle all other valid messages */
+		if (msg >= RP_MBOX_READY && msg < RP_MBOX_END_MSG)
+			return;
+		if (msg > kproc->rproc->max_notifyid) {
+			dev_dbg(dev, "dropping unknown message 0x%x", msg);
+			return;
+		}
+		/* msg contains the index of the triggered vring */
+		if (rproc_vq_interrupt(kproc->rproc, msg) == IRQ_NONE)
+			dev_dbg(dev, "no message was found in vqid %d\n", msg);
+	}
+}
+
+/*
+ * Kick the remote processor to notify about pending unprocessed messages.
+ * The vqid usage is not used and is inconsequential, as the kick is performed
+ * through a simulated GPIO (a bit in an IPC interrupt-triggering register),
+ * the remote processor is expected to process both its Tx and Rx virtqueues.
+ */
+static void k3_m4_rproc_kick(struct rproc *rproc, int vqid)
+{
+	struct k3_m4_rproc *kproc = rproc->priv;
+	struct device *dev = rproc->dev.parent;
+	u32 msg = (u32)vqid;
+	int ret;
+
+	/* send the index of the triggered virtqueue in the mailbox payload */
+	ret = mbox_send_message(kproc->mbox, (void *)(uintptr_t)msg);
+	if (ret < 0)
+		dev_err(dev, "failed to send mailbox message, status = %d\n",
+			ret);
+}
+
+/* Put the remote processor into reset */
+static int k3_m4_rproc_reset(struct k3_m4_rproc *kproc)
+{
+	struct device *dev = kproc->dev;
+	int ret;
+
+	ret = reset_control_assert(kproc->reset);
+	if (ret) {
+		dev_err(dev, "local-reset assert failed, ret = %d\n", ret);
+		return ret;
+	}
+
+	if (kproc->data->uses_lreset)
+		return ret;
+
+	ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
+						    kproc->ti_sci_id);
+	if (ret) {
+		dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
+		if (reset_control_deassert(kproc->reset))
+			dev_warn(dev, "local-reset deassert back failed\n");
+	}
+
+	return ret;
+}
+
+/* Release the remote processor from reset */
+static int k3_m4_rproc_release(struct k3_m4_rproc *kproc)
+{
+	struct device *dev = kproc->dev;
+	int ret;
+
+	if (kproc->data->uses_lreset)
+		goto lreset;
+
+	ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
+						    kproc->ti_sci_id);
+	if (ret) {
+		dev_err(dev, "module-reset deassert failed, ret = %d\n", ret);
+		return ret;
+	}
+
+lreset:
+	ret = reset_control_deassert(kproc->reset);
+	if (ret) {
+		dev_err(dev, "local-reset deassert failed, ret = %d\n", ret);
+		if (kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
+							  kproc->ti_sci_id))
+			dev_warn(dev, "module-reset assert back failed\n");
+	}
+
+	return ret;
+}
+
+static int k3_m4_rproc_request_mbox(struct rproc *rproc)
+{
+	struct k3_m4_rproc *kproc = rproc->priv;
+	struct mbox_client *client = &kproc->client;
+	struct device *dev = kproc->dev;
+	int ret;
+
+	client->dev = dev;
+	client->tx_done = NULL;
+	client->rx_callback = k3_m4_rproc_mbox_callback;
+	client->tx_block = false;
+	client->knows_txdone = false;
+
+	kproc->mbox = mbox_request_channel(client, 0);
+	if (IS_ERR(kproc->mbox)) {
+		ret = -EBUSY;
+		dev_err(dev, "mbox_request_channel failed: %ld\n",
+			PTR_ERR(kproc->mbox));
+		return ret;
+	}
+
+	/*
+	 * Ping the remote processor, this is only for sanity-sake for now;
+	 * there is no functional effect whatsoever.
+	 *
+	 * Note that the reply will _not_ arrive immediately: this message
+	 * will wait in the mailbox fifo until the remote processor is booted.
+	 */
+	ret = mbox_send_message(kproc->mbox, (void *)RP_MBOX_ECHO_REQUEST);
+	if (ret < 0) {
+		dev_err(dev, "mbox_send_message failed: %d\n", ret);
+		mbox_free_channel(kproc->mbox);
+		return ret;
+	}
+
+	return 0;
+}
+
+/*
+ * The M4 cores have a local reset that affects only the CPU, and a
+ * generic module reset that powers on the device and allows the internal
+ * memories to be accessed while the local reset is asserted. This function is
+ * used to release the global reset on remote cores to allow loading into the
+ * internal RAMs. The .prepare() ops is invoked by remoteproc core before any
+ * firmware loading, and is followed by the .start() ops after loading to
+ * actually let the remote cores to run. This callback is invoked only in
+ * remoteproc mode.
+ */
+static int k3_m4_rproc_prepare(struct rproc *rproc)
+{
+	struct k3_m4_rproc *kproc = rproc->priv;
+	struct device *dev = kproc->dev;
+	int ret;
+
+	ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
+						    kproc->ti_sci_id);
+	if (ret)
+		dev_err(dev, "module-reset deassert failed, cannot enable internal RAM loading, ret = %d\n",
+			ret);
+
+	return ret;
+}
+
+/*
+ * This function implements the .unprepare() ops and performs the complimentary
+ * operations to that of the .prepare() ops. The function is used to assert the
+ * global reset on applicable cores. This completes the second portion of
+ * powering down the remote core. The cores themselves are only halted in the
+ * .stop() callback through the local reset, and the .unprepare() ops is invoked
+ * by the remoteproc core after the remoteproc is stopped to balance the global
+ * reset. This callback is invoked only in remoteproc mode.
+ */
+static int k3_m4_rproc_unprepare(struct rproc *rproc)
+{
+	struct k3_m4_rproc *kproc = rproc->priv;
+	struct device *dev = kproc->dev;
+	int ret;
+
+	ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
+						    kproc->ti_sci_id);
+	if (ret)
+		dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
+
+	return ret;
+}
+
+/*
+ * This function implements the .get_loaded_rsc_table() callback and is used
+ * to provide the resource table for a booted remote processor in IPC-only
+ * mode. The remote processor firmwares follow a design-by-contract approach
+ * and are expected to have the resource table at the base of the DDR region
+ * reserved for firmware usage. This provides flexibility for the remote
+ * processor to be booted by different bootloaders that may or may not have the
+ * ability to publish the resource table address and size through a DT
+ * property.
+ */
+static struct resource_table *k3_m4_get_loaded_rsc_table(struct rproc *rproc,
+							 size_t *rsc_table_sz)
+{
+	struct k3_m4_rproc *kproc = rproc->priv;
+	struct device *dev = kproc->dev;
+
+	if (!kproc->rmem[0].cpu_addr) {
+		dev_err(dev, "memory-region #1 does not exist, loaded rsc table can't be found");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	/*
+	 * NOTE: The resource table size is currently hard-coded to a maximum
+	 * of 256 bytes. The most common resource table usage for K3 firmwares
+	 * is to only have the vdev resource entry and an optional trace entry.
+	 * The exact size could be computed based on resource table address, but
+	 * the hard-coded value suffices to support the IPC-only mode.
+	 */
+	*rsc_table_sz = 256;
+	return (__force struct resource_table *)kproc->rmem[0].cpu_addr;
+}
+
+/*
+ * Custom function to translate a remote processor device address (internal
+ * RAMs only) to a kernel virtual address.  The remote processors can access
+ * their RAMs at either an internal address visible only from a remote
+ * processor, or at the SoC-level bus address. Both these addresses need to be
+ * looked through for translation. The translated addresses can be used either
+ * by the remoteproc core for loading (when using kernel remoteproc loader), or
+ * by any rpmsg bus drivers.
+ */
+static void *k3_m4_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
+{
+	struct k3_m4_rproc *kproc = rproc->priv;
+	void __iomem *va = NULL;
+	phys_addr_t bus_addr;
+	u32 dev_addr, offset;
+	size_t size;
+	int i;
+
+	if (len == 0)
+		return NULL;
+
+	for (i = 0; i < kproc->num_mems; i++) {
+		bus_addr = kproc->mem[i].bus_addr;
+		dev_addr = kproc->mem[i].dev_addr;
+		size = kproc->mem[i].size;
+
+		/* handle M4-view addresses */
+		if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
+			offset = da - dev_addr;
+			va = kproc->mem[i].cpu_addr + offset;
+			return (__force void *)va;
+		}
+
+		/* handle SoC-view addresses */
+		if (da >= bus_addr && ((da + len) <= (bus_addr + size))) {
+			offset = da - bus_addr;
+			va = kproc->mem[i].cpu_addr + offset;
+			return (__force void *)va;
+		}
+	}
+
+	/* handle static DDR reserved memory regions */
+	for (i = 0; i < kproc->num_rmems; i++) {
+		dev_addr = kproc->rmem[i].dev_addr;
+		size = kproc->rmem[i].size;
+
+		if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
+			offset = da - dev_addr;
+			va = kproc->rmem[i].cpu_addr + offset;
+			return (__force void *)va;
+		}
+	}
+
+	return NULL;
+}
+
+static int k3_m4_rproc_of_get_memories(struct platform_device *pdev,
+				       struct k3_m4_rproc *kproc)
+{
+	const struct k3_m4_rproc_dev_data *data = kproc->data;
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	int num_mems = 0;
+	int i;
+
+	num_mems = kproc->data->num_mems;
+	kproc->mem = devm_kcalloc(kproc->dev, num_mems,
+				  sizeof(*kproc->mem), GFP_KERNEL);
+	if (!kproc->mem)
+		return -ENOMEM;
+
+	for (i = 0; i < num_mems; i++) {
+		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+						   data->mems[i].name);
+		if (!res) {
+			dev_err(dev, "found no memory resource for %s\n",
+				data->mems[i].name);
+			return -EINVAL;
+		}
+		if (!devm_request_mem_region(dev, res->start,
+					     resource_size(res),
+					     dev_name(dev))) {
+			dev_err(dev, "could not request %s region for resource\n",
+				data->mems[i].name);
+			return -EBUSY;
+		}
+
+		kproc->mem[i].cpu_addr = devm_ioremap_wc(dev, res->start,
+							 resource_size(res));
+		if (!kproc->mem[i].cpu_addr) {
+			dev_err(dev, "failed to map %s memory\n",
+				data->mems[i].name);
+			return -ENOMEM;
+		}
+		kproc->mem[i].bus_addr = res->start;
+		kproc->mem[i].dev_addr = data->mems[i].dev_addr;
+		kproc->mem[i].size = resource_size(res);
+
+		dev_dbg(dev, "memory %8s: bus addr %pa size 0x%zx va %pK da 0x%x\n",
+			data->mems[i].name, &kproc->mem[i].bus_addr,
+			kproc->mem[i].size, kproc->mem[i].cpu_addr,
+			kproc->mem[i].dev_addr);
+	}
+	kproc->num_mems = num_mems;
+
+	return 0;
+}
+
+static void k3_m4_rproc_dev_mem_release(void *data)
+{
+	struct device *dev = data;
+
+	of_reserved_mem_device_release(dev);
+}
+
+static int k3_m4_reserved_mem_init(struct k3_m4_rproc *kproc)
+{
+	struct device *dev = kproc->dev;
+	struct device_node *np = dev->of_node;
+	struct device_node *rmem_np;
+	struct reserved_mem *rmem;
+	int num_rmems;
+	int ret, i;
+
+	num_rmems = of_property_count_elems_of_size(np, "memory-region",
+						    sizeof(phandle));
+	if (num_rmems < 0) {
+		dev_err(dev, "device does not reserved memory regions (%pe)\n",
+			ERR_PTR(num_rmems));
+		return -EINVAL;
+	}
+	if (num_rmems < 2) {
+		dev_err(dev, "device needs at least two memory regions to be defined, num = %d\n",
+			num_rmems);
+		return -EINVAL;
+	}
+
+	/* use reserved memory region 0 for vring DMA allocations */
+	ret = of_reserved_mem_device_init_by_idx(dev, np, 0);
+	if (ret) {
+		dev_err(dev, "device cannot initialize DMA pool (%pe)\n",
+			ERR_PTR(ret));
+		return ret;
+	}
+	ret = devm_add_action_or_reset(dev, k3_m4_rproc_dev_mem_release, dev);
+	if (ret)
+		return ret;
+
+	num_rmems--;
+	kproc->rmem = devm_kcalloc(dev, num_rmems, sizeof(*kproc->rmem), GFP_KERNEL);
+	if (!kproc->rmem)
+		return -ENOMEM;
+
+	/* use remaining reserved memory regions for static carveouts */
+	for (i = 0; i < num_rmems; i++) {
+		rmem_np = of_parse_phandle(np, "memory-region", i + 1);
+		if (!rmem_np)
+			return -EINVAL;
+
+		rmem = of_reserved_mem_lookup(rmem_np);
+		if (!rmem) {
+			of_node_put(rmem_np);
+			return -EINVAL;
+		}
+		of_node_put(rmem_np);
+
+		kproc->rmem[i].bus_addr = rmem->base;
+		/* 64-bit address regions currently not supported */
+		kproc->rmem[i].dev_addr = (u32)rmem->base;
+		kproc->rmem[i].size = rmem->size;
+		kproc->rmem[i].cpu_addr = devm_ioremap_wc(dev, rmem->base, rmem->size);
+		if (!kproc->rmem[i].cpu_addr) {
+			dev_err(dev, "failed to map reserved memory#%d at %pa of size %pa\n",
+				i + 1, &rmem->base, &rmem->size);
+			return -ENOMEM;
+		}
+
+		dev_dbg(dev, "reserved memory%d: bus addr %pa size 0x%zx va %pK da 0x%x\n",
+			i + 1, &kproc->rmem[i].bus_addr,
+			kproc->rmem[i].size, kproc->rmem[i].cpu_addr,
+			kproc->rmem[i].dev_addr);
+	}
+	kproc->num_rmems = num_rmems;
+
+	return 0;
+}
+
+static struct ti_sci_proc *k3_m4_rproc_of_get_tsp(struct device *dev,
+						  const struct ti_sci_handle *sci)
+{
+	struct ti_sci_proc *tsp;
+	u32 temp[2];
+	int ret;
+
+	ret = of_property_read_u32_array(dev->of_node, "ti,sci-proc-ids",
+					 temp, 2);
+	if (ret < 0)
+		return ERR_PTR(ret);
+
+	tsp = devm_kzalloc(dev, sizeof(*tsp), GFP_KERNEL);
+	if (!tsp)
+		return ERR_PTR(-ENOMEM);
+
+	tsp->dev = dev;
+	tsp->sci = sci;
+	tsp->ops = &sci->ops.proc_ops;
+	tsp->proc_id = temp[0];
+	tsp->host_id = temp[1];
+
+	return tsp;
+}
+
+static void k3_m4_release_tsp(void *data)
+{
+	struct ti_sci_proc *tsp = data;
+
+	ti_sci_proc_release(tsp);
+}
+
+/*
+ * Power up the M4F remote processor.
+ *
+ * This function will be invoked only after the firmware for this rproc
+ * was loaded, parsed successfully, and all of its resource requirements
+ * were met. This callback is invoked only in remoteproc mode.
+ */
+static int k3_m4_rproc_start(struct rproc *rproc)
+{
+	struct k3_m4_rproc *kproc = rproc->priv;
+	int ret;
+
+	ret = k3_m4_rproc_request_mbox(rproc);
+	if (ret)
+		return ret;
+
+	ret = k3_m4_rproc_release(kproc);
+	if (ret)
+		goto put_mbox;
+
+	return 0;
+
+put_mbox:
+	mbox_free_channel(kproc->mbox);
+	return ret;
+}
+
+/*
+ * Stop the M4 remote processor.
+ *
+ * This function puts the M4 processor into reset, and finishes processing
+ * of any pending messages. This callback is invoked only in remoteproc mode.
+ */
+static int k3_m4_rproc_stop(struct rproc *rproc)
+{
+	struct k3_m4_rproc *kproc = rproc->priv;
+
+	mbox_free_channel(kproc->mbox);
+
+	k3_m4_rproc_reset(kproc);
+
+	return 0;
+}
+
+/*
+ * Attach to a running M4 remote processor (IPC-only mode)
+ *
+ * This rproc attach callback only needs to request the mailbox, the remote
+ * processor is already booted, so there is no need to issue any TI-SCI
+ * commands to boot the M4 core. This callback is used only in IPC-only mode.
+ */
+static int k3_m4_rproc_attach(struct rproc *rproc)
+{
+	struct k3_m4_rproc *kproc = rproc->priv;
+	struct device *dev = kproc->dev;
+	int ret;
+
+	ret = k3_m4_rproc_request_mbox(rproc);
+	if (ret)
+		return ret;
+
+	dev_info(dev, "M4 initialized in IPC-only mode\n");
+	return 0;
+}
+
+/*
+ * Detach from a running M4 remote processor (IPC-only mode)
+ *
+ * This rproc detach callback performs the opposite operation to attach callback
+ * and only needs to release the mailbox, the M4 core is not stopped and will
+ * be left to continue to run its booted firmware. This callback is invoked only in
+ * IPC-only mode.
+ */
+static int k3_m4_rproc_detach(struct rproc *rproc)
+{
+	struct k3_m4_rproc *kproc = rproc->priv;
+	struct device *dev = kproc->dev;
+
+	mbox_free_channel(kproc->mbox);
+	dev_info(dev, "M4 deinitialized in IPC-only mode\n");
+	return 0;
+}
+
+static const struct rproc_ops k3_m4_rproc_ops = {
+	.start		= k3_m4_rproc_start,
+	.stop		= k3_m4_rproc_stop,
+	.attach		= k3_m4_rproc_attach,
+	.detach		= k3_m4_rproc_detach,
+	.kick		= k3_m4_rproc_kick,
+	.da_to_va	= k3_m4_rproc_da_to_va,
+	.get_loaded_rsc_table = k3_m4_get_loaded_rsc_table,
+};
+
+static int k3_m4_rproc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	const struct k3_m4_rproc_dev_data *data;
+	struct k3_m4_rproc *kproc;
+	struct rproc *rproc;
+	const char *fw_name;
+	bool r_state = false;
+	bool p_state = false;
+	int ret = 0;
+
+	data = device_get_match_data(dev);
+	if (!data)
+		return -ENODEV;
+
+	ret = rproc_of_parse_firmware(dev, 0, &fw_name);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to parse firmware-name property\n");
+
+	rproc = devm_rproc_alloc(dev, dev_name(dev), &k3_m4_rproc_ops, fw_name,
+				 sizeof(*kproc));
+	if (!rproc)
+		return -ENOMEM;
+
+	rproc->has_iommu = false;
+	rproc->recovery_disabled = true;
+	if (data->uses_lreset) {
+		rproc->ops->prepare = k3_m4_rproc_prepare;
+		rproc->ops->unprepare = k3_m4_rproc_unprepare;
+	}
+	kproc = rproc->priv;
+	kproc->rproc = rproc;
+	kproc->dev = dev;
+	kproc->data = data;
+
+	kproc->ti_sci = devm_ti_sci_get_by_phandle(dev, "ti,sci");
+	if (IS_ERR(kproc->ti_sci))
+		return dev_err_probe(dev, PTR_ERR(kproc->ti_sci),
+				     "failed to get ti-sci handle\n");
+
+	ret = of_property_read_u32(np, "ti,sci-dev-id", &kproc->ti_sci_id);
+	if (ret)
+		return dev_err_probe(dev, ret, "missing 'ti,sci-dev-id' property\n");
+
+	kproc->reset = devm_reset_control_get_exclusive(dev, NULL);
+	if (IS_ERR(kproc->reset))
+		return dev_err_probe(dev, PTR_ERR(kproc->reset), "failed to get reset\n");
+
+	kproc->tsp = k3_m4_rproc_of_get_tsp(dev, kproc->ti_sci);
+	if (IS_ERR(kproc->tsp))
+		return dev_err_probe(dev, PTR_ERR(kproc->tsp),
+				     "failed to construct ti-sci proc control\n");
+
+	ret = ti_sci_proc_request(kproc->tsp);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "ti_sci_proc_request failed\n");
+	ret = devm_add_action_or_reset(dev, k3_m4_release_tsp, kproc->tsp);
+	if (ret)
+		return ret;
+
+	ret = k3_m4_rproc_of_get_memories(pdev, kproc);
+	if (ret)
+		return ret;
+
+	ret = k3_m4_reserved_mem_init(kproc);
+	if (ret)
+		return dev_err_probe(dev, ret, "reserved memory init failed\n");
+
+	ret = kproc->ti_sci->ops.dev_ops.is_on(kproc->ti_sci, kproc->ti_sci_id,
+					       &r_state, &p_state);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "failed to get initial state, mode cannot be determined\n");
+
+	/* configure devices for either remoteproc or IPC-only mode */
+	if (p_state) {
+		dev_info(dev, "configured M4 for IPC-only mode\n");
+		rproc->state = RPROC_DETACHED;
+		/* override rproc ops with only required IPC-only mode ops */
+		rproc->ops->prepare = NULL;
+		rproc->ops->unprepare = NULL;
+		rproc->ops->start = NULL;
+		rproc->ops->stop = NULL;
+		rproc->ops->attach = k3_m4_rproc_attach;
+		rproc->ops->detach = k3_m4_rproc_detach;
+		rproc->ops->get_loaded_rsc_table = k3_m4_get_loaded_rsc_table;
+	} else {
+		dev_info(dev, "configured M4 for remoteproc mode\n");
+		/*
+		 * ensure the M4 local reset is asserted to ensure the core
+		 * doesn't execute bogus code in .prepare() when the module
+		 * reset is released.
+		 */
+		if (data->uses_lreset) {
+			ret = reset_control_status(kproc->reset);
+			if (ret < 0) {
+				return dev_err_probe(dev, ret, "failed to get reset status\n");
+			} else if (ret == 0) {
+				dev_warn(dev, "local reset is deasserted for device\n");
+				k3_m4_rproc_reset(kproc);
+			}
+		}
+	}
+
+	ret = devm_rproc_add(dev, rproc);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "failed to add register device with remoteproc core\n");
+
+	return 0;
+}
+
+static const struct k3_m4_rproc_mem_data am64_m4_mems[] = {
+	{ .name = "iram", .dev_addr = 0x0 },
+	{ .name = "dram", .dev_addr = 0x30000 },
+};
+
+static const struct k3_m4_rproc_dev_data am64_m4_data = {
+	.mems = am64_m4_mems,
+	.num_mems = ARRAY_SIZE(am64_m4_mems),
+	.uses_lreset = true,
+};
+
+static const struct of_device_id k3_m4_of_match[] = {
+	{ .compatible = "ti,am64-m4fss", .data = &am64_m4_data, },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, k3_m4_of_match);
+
+static struct platform_driver k3_m4_rproc_driver = {
+	.probe	= k3_m4_rproc_probe,
+	.driver	= {
+		.name = "k3-m4-rproc",
+		.of_match_table = k3_m4_of_match,
+	},
+};
+module_platform_driver(k3_m4_rproc_driver);
+
+MODULE_AUTHOR("Hari Nagalla <hnagalla@ti.com>");
+MODULE_DESCRIPTION("TI K3 M4 Remoteproc driver");
+MODULE_LICENSE("GPL");
-- 
2.39.2


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Re: [PATCH v9 2/5] remoteproc: k3-m4: Add a remoteproc driver for M4F subsystem

[Mathieu Poirier]

Good day,

I have started reviewing this patchset.  Comments will be scattered over
multiple days and as such, I will explicitly inform you when  am done with the
review.

On Fri, Apr 26, 2024 at 02:18:08PM -0500, Andrew Davis wrote:
> From: Martyn Welch <martyn.welch@collabora.com>
> 
> The AM62x and AM64x SoCs of the TI K3 family has a Cortex M4F core in
> the MCU domain. This core is typically used for safety applications in a
> stand alone mode. However, some application (non safety related) may
> want to use the M4F core as a generic remote processor with IPC to the
> host processor. The M4F core has internal IRAM and DRAM memories and are
> exposed to the system bus for code and data loading.
> 
> A remote processor driver is added to support this subsystem, including
> being able to load and boot the M4F core. Loading includes to M4F
> internal memories and predefined external code/data memories. The
> carve outs for external contiguous memory is defined in the M4F device
> node and should match with the external memory declarations in the M4F
> image binary. The M4F subsystem has two resets. One reset is for the
> entire subsystem i.e including the internal memories and the other, a
> local reset is only for the M4F processing core. When loading the image,
> the driver first releases the subsystem reset, loads the firmware image
> and then releases the local reset to let the M4F processing core run.
> 
> Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
> Signed-off-by: Hari Nagalla <hnagalla@ti.com>
> Signed-off-by: Andrew Davis <afd@ti.com>
> ---
>  drivers/remoteproc/Kconfig               |  13 +
>  drivers/remoteproc/Makefile              |   1 +
>  drivers/remoteproc/ti_k3_m4_remoteproc.c | 785 +++++++++++++++++++++++
>  3 files changed, 799 insertions(+)
>  create mode 100644 drivers/remoteproc/ti_k3_m4_remoteproc.c
> 
> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> index 48845dc8fa852..1a7c0330c91a9 100644
> --- a/drivers/remoteproc/Kconfig
> +++ b/drivers/remoteproc/Kconfig
> @@ -339,6 +339,19 @@ config TI_K3_DSP_REMOTEPROC
>  	  It's safe to say N here if you're not interested in utilizing
>  	  the DSP slave processors.
>  
> +config TI_K3_M4_REMOTEPROC
> +	tristate "TI K3 M4 remoteproc support"
> +	depends on ARCH_K3 || COMPILE_TEST
> +	select MAILBOX
> +	select OMAP2PLUS_MBOX
> +	help
> +	  Say m here to support TI's M4 remote processor subsystems
> +	  on various TI K3 family of SoCs through the remote processor
> +	  framework.
> +
> +	  It's safe to say N here if you're not interested in utilizing
> +	  a remote processor.
> +
>  config TI_K3_R5_REMOTEPROC
>  	tristate "TI K3 R5 remoteproc support"
>  	depends on ARCH_K3
> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
> index 91314a9b43cef..5ff4e2fee4abd 100644
> --- a/drivers/remoteproc/Makefile
> +++ b/drivers/remoteproc/Makefile
> @@ -37,5 +37,6 @@ obj-$(CONFIG_ST_REMOTEPROC)		+= st_remoteproc.o
>  obj-$(CONFIG_ST_SLIM_REMOTEPROC)	+= st_slim_rproc.o
>  obj-$(CONFIG_STM32_RPROC)		+= stm32_rproc.o
>  obj-$(CONFIG_TI_K3_DSP_REMOTEPROC)	+= ti_k3_dsp_remoteproc.o
> +obj-$(CONFIG_TI_K3_M4_REMOTEPROC)	+= ti_k3_m4_remoteproc.o
>  obj-$(CONFIG_TI_K3_R5_REMOTEPROC)	+= ti_k3_r5_remoteproc.o
>  obj-$(CONFIG_XLNX_R5_REMOTEPROC)	+= xlnx_r5_remoteproc.o
> diff --git a/drivers/remoteproc/ti_k3_m4_remoteproc.c b/drivers/remoteproc/ti_k3_m4_remoteproc.c
> new file mode 100644
> index 0000000000000..0030e509f6b5d
> --- /dev/null
> +++ b/drivers/remoteproc/ti_k3_m4_remoteproc.c
> @@ -0,0 +1,785 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * TI K3 Cortex-M4 Remote Processor(s) driver
> + *
> + * Copyright (C) 2021-2024 Texas Instruments Incorporated - https://www.ti.com/
> + *	Hari Nagalla <hnagalla@ti.com>
> + */
> +
> +#include <linux/io.h>
> +#include <linux/mailbox_client.h>
> +#include <linux/module.h>
> +#include <linux/of_address.h>
> +#include <linux/of_reserved_mem.h>
> +#include <linux/platform_device.h>
> +#include <linux/remoteproc.h>
> +#include <linux/reset.h>
> +#include <linux/slab.h>
> +
> +#include "omap_remoteproc.h"
> +#include "remoteproc_internal.h"
> +#include "ti_sci_proc.h"
> +
> +/**
> + * struct k3_m4_rproc_mem - internal memory structure
> + * @cpu_addr: MPU virtual address of the memory region
> + * @bus_addr: Bus address used to access the memory region
> + * @dev_addr: Device address of the memory region from remote processor view
> + * @size: Size of the memory region
> + */
> +struct k3_m4_rproc_mem {
> +	void __iomem *cpu_addr;
> +	phys_addr_t bus_addr;
> +	u32 dev_addr;
> +	size_t size;
> +};
> +
> +/**
> + * struct k3_m4_rproc_mem_data - memory definitions for a remote processor
> + * @name: name for this memory entry
> + * @dev_addr: device address for the memory entry
> + */
> +struct k3_m4_rproc_mem_data {
> +	const char *name;
> +	const u32 dev_addr;
> +};
> +
> +/**
> + * struct k3_m4_rproc_dev_data - device data structure for a remote processor
> + * @mems: pointer to memory definitions for a remote processor
> + * @num_mems: number of memory regions in @mems
> + * @uses_lreset: flag to denote the need for local reset management
> + */
> +struct k3_m4_rproc_dev_data {
> +	const struct k3_m4_rproc_mem_data *mems;
> +	u32 num_mems;
> +	bool uses_lreset;
> +};
> +
> +/**
> + * struct k3_m4_rproc - k3 remote processor driver structure
> + * @dev: cached device pointer
> + * @rproc: remoteproc device handle
> + * @mem: internal memory regions data
> + * @num_mems: number of internal memory regions
> + * @rmem: reserved memory regions data
> + * @num_rmems: number of reserved memory regions
> + * @reset: reset control handle
> + * @data: pointer to device data
> + * @tsp: TI-SCI processor control handle
> + * @ti_sci: TI-SCI handle
> + * @ti_sci_id: TI-SCI device identifier
> + * @mbox: mailbox channel handle
> + * @client: mailbox client to request the mailbox channel
> + */
> +struct k3_m4_rproc {
> +	struct device *dev;
> +	struct rproc *rproc;
> +	struct k3_m4_rproc_mem *mem;
> +	int num_mems;
> +	struct k3_m4_rproc_mem *rmem;
> +	int num_rmems;
> +	struct reset_control *reset;
> +	const struct k3_m4_rproc_dev_data *data;
> +	struct ti_sci_proc *tsp;
> +	const struct ti_sci_handle *ti_sci;
> +	u32 ti_sci_id;
> +	struct mbox_chan *mbox;
> +	struct mbox_client client;
> +};
> +
> +/**
> + * k3_m4_rproc_mbox_callback() - inbound mailbox message handler
> + * @client: mailbox client pointer used for requesting the mailbox channel
> + * @data: mailbox payload
> + *
> + * This handler is invoked by the K3 mailbox driver whenever a mailbox
> + * message is received. Usually, the mailbox payload simply contains
> + * the index of the virtqueue that is kicked by the remote processor,
> + * and we let remoteproc core handle it.
> + *
> + * In addition to virtqueue indices, we also have some out-of-band values
> + * that indicate different events. Those values are deliberately very
> + * large so they don't coincide with virtqueue indices.
> + */
> +static void k3_m4_rproc_mbox_callback(struct mbox_client *client, void *data)
> +{
> +	struct k3_m4_rproc *kproc = container_of(client, struct k3_m4_rproc,
> +						  client);
> +	struct device *dev = kproc->rproc->dev.parent;
> +	const char *name = kproc->rproc->name;
> +	u32 msg = (u32)(uintptr_t)(data);
> +
> +	dev_dbg(dev, "mbox msg: 0x%x\n", msg);
> +
> +	switch (msg) {
> +	case RP_MBOX_CRASH:
> +		/*
> +		 * remoteproc detected an exception, but error recovery is not
> +		 * supported. So, just log this for now
> +		 */
> +		dev_err(dev, "K3 rproc %s crashed\n", name);
> +		break;
> +	case RP_MBOX_ECHO_REPLY:
> +		dev_info(dev, "received echo reply from %s\n", name);
> +		break;
> +	default:
> +		/* silently handle all other valid messages */
> +		if (msg >= RP_MBOX_READY && msg < RP_MBOX_END_MSG)
> +			return;
> +		if (msg > kproc->rproc->max_notifyid) {
> +			dev_dbg(dev, "dropping unknown message 0x%x", msg);
> +			return;
> +		}
> +		/* msg contains the index of the triggered vring */
> +		if (rproc_vq_interrupt(kproc->rproc, msg) == IRQ_NONE)
> +			dev_dbg(dev, "no message was found in vqid %d\n", msg);
> +	}
> +}
> +
> +/*
> + * Kick the remote processor to notify about pending unprocessed messages.
> + * The vqid usage is not used and is inconsequential, as the kick is performed
> + * through a simulated GPIO (a bit in an IPC interrupt-triggering register),
> + * the remote processor is expected to process both its Tx and Rx virtqueues.
> + */
> +static void k3_m4_rproc_kick(struct rproc *rproc, int vqid)
> +{
> +	struct k3_m4_rproc *kproc = rproc->priv;
> +	struct device *dev = rproc->dev.parent;
> +	u32 msg = (u32)vqid;
> +	int ret;
> +
> +	/* send the index of the triggered virtqueue in the mailbox payload */
> +	ret = mbox_send_message(kproc->mbox, (void *)(uintptr_t)msg);
> +	if (ret < 0)
> +		dev_err(dev, "failed to send mailbox message, status = %d\n",
> +			ret);
> +}
> +
> +/* Put the remote processor into reset */
> +static int k3_m4_rproc_reset(struct k3_m4_rproc *kproc)
> +{
> +	struct device *dev = kproc->dev;
> +	int ret;
> +
> +	ret = reset_control_assert(kproc->reset);
> +	if (ret) {
> +		dev_err(dev, "local-reset assert failed, ret = %d\n", ret);
> +		return ret;
> +	}
> +
> +	if (kproc->data->uses_lreset)
> +		return ret;
> +
> +	ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
> +						    kproc->ti_sci_id);
> +	if (ret) {
> +		dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
> +		if (reset_control_deassert(kproc->reset))
> +			dev_warn(dev, "local-reset deassert back failed\n");
> +	}
> +
> +	return ret;
> +}
> +
> +/* Release the remote processor from reset */
> +static int k3_m4_rproc_release(struct k3_m4_rproc *kproc)
> +{
> +	struct device *dev = kproc->dev;
> +	int ret;
> +
> +	if (kproc->data->uses_lreset)
> +		goto lreset;
> +
> +	ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
> +						    kproc->ti_sci_id);
> +	if (ret) {
> +		dev_err(dev, "module-reset deassert failed, ret = %d\n", ret);
> +		return ret;
> +	}
> +
> +lreset:
> +	ret = reset_control_deassert(kproc->reset);
> +	if (ret) {
> +		dev_err(dev, "local-reset deassert failed, ret = %d\n", ret);
> +		if (kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
> +							  kproc->ti_sci_id))
> +			dev_warn(dev, "module-reset assert back failed\n");
> +	}
> +
> +	return ret;
> +}
> +
> +static int k3_m4_rproc_request_mbox(struct rproc *rproc)
> +{
> +	struct k3_m4_rproc *kproc = rproc->priv;
> +	struct mbox_client *client = &kproc->client;
> +	struct device *dev = kproc->dev;
> +	int ret;
> +
> +	client->dev = dev;
> +	client->tx_done = NULL;
> +	client->rx_callback = k3_m4_rproc_mbox_callback;
> +	client->tx_block = false;
> +	client->knows_txdone = false;
> +
> +	kproc->mbox = mbox_request_channel(client, 0);
> +	if (IS_ERR(kproc->mbox)) {
> +		ret = -EBUSY;
> +		dev_err(dev, "mbox_request_channel failed: %ld\n",
> +			PTR_ERR(kproc->mbox));
> +		return ret;
> +	}
> +
> +	/*
> +	 * Ping the remote processor, this is only for sanity-sake for now;
> +	 * there is no functional effect whatsoever.
> +	 *
> +	 * Note that the reply will _not_ arrive immediately: this message
> +	 * will wait in the mailbox fifo until the remote processor is booted.
> +	 */
> +	ret = mbox_send_message(kproc->mbox, (void *)RP_MBOX_ECHO_REQUEST);
> +	if (ret < 0) {
> +		dev_err(dev, "mbox_send_message failed: %d\n", ret);
> +		mbox_free_channel(kproc->mbox);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +/*
> + * The M4 cores have a local reset that affects only the CPU, and a
> + * generic module reset that powers on the device and allows the internal
> + * memories to be accessed while the local reset is asserted. This function is
> + * used to release the global reset on remote cores to allow loading into the
> + * internal RAMs. The .prepare() ops is invoked by remoteproc core before any
> + * firmware loading, and is followed by the .start() ops after loading to
> + * actually let the remote cores to run. This callback is invoked only in
> + * remoteproc mode.
> + */
> +static int k3_m4_rproc_prepare(struct rproc *rproc)
> +{
> +	struct k3_m4_rproc *kproc = rproc->priv;
> +	struct device *dev = kproc->dev;
> +	int ret;
> +
> +	ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
> +						    kproc->ti_sci_id);
> +	if (ret)
> +		dev_err(dev, "module-reset deassert failed, cannot enable internal RAM loading, ret = %d\n",
> +			ret);
> +
> +	return ret;
> +}
> +
> +/*
> + * This function implements the .unprepare() ops and performs the complimentary
> + * operations to that of the .prepare() ops. The function is used to assert the
> + * global reset on applicable cores. This completes the second portion of
> + * powering down the remote core. The cores themselves are only halted in the
> + * .stop() callback through the local reset, and the .unprepare() ops is invoked
> + * by the remoteproc core after the remoteproc is stopped to balance the global
> + * reset. This callback is invoked only in remoteproc mode.
> + */
> +static int k3_m4_rproc_unprepare(struct rproc *rproc)
> +{
> +	struct k3_m4_rproc *kproc = rproc->priv;
> +	struct device *dev = kproc->dev;
> +	int ret;
> +
> +	ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
> +						    kproc->ti_sci_id);
> +	if (ret)
> +		dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
> +
> +	return ret;
> +}
> +
> +/*
> + * This function implements the .get_loaded_rsc_table() callback and is used
> + * to provide the resource table for a booted remote processor in IPC-only
> + * mode. The remote processor firmwares follow a design-by-contract approach
> + * and are expected to have the resource table at the base of the DDR region
> + * reserved for firmware usage. This provides flexibility for the remote
> + * processor to be booted by different bootloaders that may or may not have the
> + * ability to publish the resource table address and size through a DT
> + * property.
> + */
> +static struct resource_table *k3_m4_get_loaded_rsc_table(struct rproc *rproc,
> +							 size_t *rsc_table_sz)
> +{
> +	struct k3_m4_rproc *kproc = rproc->priv;
> +	struct device *dev = kproc->dev;
> +
> +	if (!kproc->rmem[0].cpu_addr) {
> +		dev_err(dev, "memory-region #1 does not exist, loaded rsc table can't be found");
> +		return ERR_PTR(-ENOMEM);
> +	}
> +
> +	/*
> +	 * NOTE: The resource table size is currently hard-coded to a maximum
> +	 * of 256 bytes. The most common resource table usage for K3 firmwares
> +	 * is to only have the vdev resource entry and an optional trace entry.
> +	 * The exact size could be computed based on resource table address, but
> +	 * the hard-coded value suffices to support the IPC-only mode.
> +	 */
> +	*rsc_table_sz = 256;
> +	return (__force struct resource_table *)kproc->rmem[0].cpu_addr;
> +}
> +
> +/*
> + * Custom function to translate a remote processor device address (internal
> + * RAMs only) to a kernel virtual address.  The remote processors can access
> + * their RAMs at either an internal address visible only from a remote
> + * processor, or at the SoC-level bus address. Both these addresses need to be
> + * looked through for translation. The translated addresses can be used either
> + * by the remoteproc core for loading (when using kernel remoteproc loader), or
> + * by any rpmsg bus drivers.
> + */
> +static void *k3_m4_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
> +{
> +	struct k3_m4_rproc *kproc = rproc->priv;
> +	void __iomem *va = NULL;
> +	phys_addr_t bus_addr;
> +	u32 dev_addr, offset;
> +	size_t size;
> +	int i;
> +
> +	if (len == 0)
> +		return NULL;
> +
> +	for (i = 0; i < kproc->num_mems; i++) {
> +		bus_addr = kproc->mem[i].bus_addr;
> +		dev_addr = kproc->mem[i].dev_addr;
> +		size = kproc->mem[i].size;
> +
> +		/* handle M4-view addresses */
> +		if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
> +			offset = da - dev_addr;
> +			va = kproc->mem[i].cpu_addr + offset;
> +			return (__force void *)va;
> +		}
> +
> +		/* handle SoC-view addresses */
> +		if (da >= bus_addr && ((da + len) <= (bus_addr + size))) {
> +			offset = da - bus_addr;
> +			va = kproc->mem[i].cpu_addr + offset;
> +			return (__force void *)va;
> +		}
> +	}
> +
> +	/* handle static DDR reserved memory regions */
> +	for (i = 0; i < kproc->num_rmems; i++) {
> +		dev_addr = kproc->rmem[i].dev_addr;
> +		size = kproc->rmem[i].size;
> +
> +		if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
> +			offset = da - dev_addr;
> +			va = kproc->rmem[i].cpu_addr + offset;
> +			return (__force void *)va;
> +		}
> +	}
> +
> +	return NULL;
> +}
> +
> +static int k3_m4_rproc_of_get_memories(struct platform_device *pdev,
> +				       struct k3_m4_rproc *kproc)
> +{
> +	const struct k3_m4_rproc_dev_data *data = kproc->data;
> +	struct device *dev = &pdev->dev;
> +	struct resource *res;
> +	int num_mems = 0;
> +	int i;
> +
> +	num_mems = kproc->data->num_mems;
> +	kproc->mem = devm_kcalloc(kproc->dev, num_mems,
> +				  sizeof(*kproc->mem), GFP_KERNEL);
> +	if (!kproc->mem)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < num_mems; i++) {
> +		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> +						   data->mems[i].name);
> +		if (!res) {
> +			dev_err(dev, "found no memory resource for %s\n",
> +				data->mems[i].name);
> +			return -EINVAL;
> +		}
> +		if (!devm_request_mem_region(dev, res->start,
> +					     resource_size(res),
> +					     dev_name(dev))) {
> +			dev_err(dev, "could not request %s region for resource\n",
> +				data->mems[i].name);
> +			return -EBUSY;
> +		}
> +
> +		kproc->mem[i].cpu_addr = devm_ioremap_wc(dev, res->start,
> +							 resource_size(res));
> +		if (!kproc->mem[i].cpu_addr) {
> +			dev_err(dev, "failed to map %s memory\n",
> +				data->mems[i].name);
> +			return -ENOMEM;
> +		}
> +		kproc->mem[i].bus_addr = res->start;
> +		kproc->mem[i].dev_addr = data->mems[i].dev_addr;
> +		kproc->mem[i].size = resource_size(res);
> +
> +		dev_dbg(dev, "memory %8s: bus addr %pa size 0x%zx va %pK da 0x%x\n",
> +			data->mems[i].name, &kproc->mem[i].bus_addr,
> +			kproc->mem[i].size, kproc->mem[i].cpu_addr,
> +			kproc->mem[i].dev_addr);
> +	}
> +	kproc->num_mems = num_mems;
> +
> +	return 0;
> +}
> +
> +static void k3_m4_rproc_dev_mem_release(void *data)
> +{
> +	struct device *dev = data;
> +
> +	of_reserved_mem_device_release(dev);
> +}
> +
> +static int k3_m4_reserved_mem_init(struct k3_m4_rproc *kproc)
> +{
> +	struct device *dev = kproc->dev;
> +	struct device_node *np = dev->of_node;
> +	struct device_node *rmem_np;
> +	struct reserved_mem *rmem;
> +	int num_rmems;
> +	int ret, i;
> +
> +	num_rmems = of_property_count_elems_of_size(np, "memory-region",
> +						    sizeof(phandle));
> +	if (num_rmems < 0) {
> +		dev_err(dev, "device does not reserved memory regions (%pe)\n",
> +			ERR_PTR(num_rmems));
> +		return -EINVAL;
> +	}
> +	if (num_rmems < 2) {
> +		dev_err(dev, "device needs at least two memory regions to be defined, num = %d\n",
> +			num_rmems);
> +		return -EINVAL;
> +	}
> +
> +	/* use reserved memory region 0 for vring DMA allocations */
> +	ret = of_reserved_mem_device_init_by_idx(dev, np, 0);
> +	if (ret) {
> +		dev_err(dev, "device cannot initialize DMA pool (%pe)\n",
> +			ERR_PTR(ret));
> +		return ret;
> +	}
> +	ret = devm_add_action_or_reset(dev, k3_m4_rproc_dev_mem_release, dev);
> +	if (ret)
> +		return ret;
> +
> +	num_rmems--;
> +	kproc->rmem = devm_kcalloc(dev, num_rmems, sizeof(*kproc->rmem), GFP_KERNEL);
> +	if (!kproc->rmem)
> +		return -ENOMEM;
> +
> +	/* use remaining reserved memory regions for static carveouts */
> +	for (i = 0; i < num_rmems; i++) {
> +		rmem_np = of_parse_phandle(np, "memory-region", i + 1);
> +		if (!rmem_np)
> +			return -EINVAL;
> +
> +		rmem = of_reserved_mem_lookup(rmem_np);
> +		if (!rmem) {
> +			of_node_put(rmem_np);
> +			return -EINVAL;
> +		}
> +		of_node_put(rmem_np);
> +
> +		kproc->rmem[i].bus_addr = rmem->base;
> +		/* 64-bit address regions currently not supported */
> +		kproc->rmem[i].dev_addr = (u32)rmem->base;
> +		kproc->rmem[i].size = rmem->size;
> +		kproc->rmem[i].cpu_addr = devm_ioremap_wc(dev, rmem->base, rmem->size);
> +		if (!kproc->rmem[i].cpu_addr) {
> +			dev_err(dev, "failed to map reserved memory#%d at %pa of size %pa\n",
> +				i + 1, &rmem->base, &rmem->size);
> +			return -ENOMEM;
> +		}
> +
> +		dev_dbg(dev, "reserved memory%d: bus addr %pa size 0x%zx va %pK da 0x%x\n",
> +			i + 1, &kproc->rmem[i].bus_addr,
> +			kproc->rmem[i].size, kproc->rmem[i].cpu_addr,
> +			kproc->rmem[i].dev_addr);
> +	}
> +	kproc->num_rmems = num_rmems;
> +
> +	return 0;
> +}
> +
> +static struct ti_sci_proc *k3_m4_rproc_of_get_tsp(struct device *dev,
> +						  const struct ti_sci_handle *sci)
> +{
> +	struct ti_sci_proc *tsp;
> +	u32 temp[2];
> +	int ret;
> +
> +	ret = of_property_read_u32_array(dev->of_node, "ti,sci-proc-ids",
> +					 temp, 2);
> +	if (ret < 0)
> +		return ERR_PTR(ret);
> +
> +	tsp = devm_kzalloc(dev, sizeof(*tsp), GFP_KERNEL);
> +	if (!tsp)
> +		return ERR_PTR(-ENOMEM);
> +
> +	tsp->dev = dev;
> +	tsp->sci = sci;
> +	tsp->ops = &sci->ops.proc_ops;
> +	tsp->proc_id = temp[0];
> +	tsp->host_id = temp[1];
> +
> +	return tsp;
> +}
> +
> +static void k3_m4_release_tsp(void *data)
> +{
> +	struct ti_sci_proc *tsp = data;
> +
> +	ti_sci_proc_release(tsp);
> +}
> +
> +/*
> + * Power up the M4F remote processor.
> + *
> + * This function will be invoked only after the firmware for this rproc
> + * was loaded, parsed successfully, and all of its resource requirements
> + * were met. This callback is invoked only in remoteproc mode.
> + */
> +static int k3_m4_rproc_start(struct rproc *rproc)
> +{
> +	struct k3_m4_rproc *kproc = rproc->priv;
> +	int ret;
> +
> +	ret = k3_m4_rproc_request_mbox(rproc);
> +	if (ret)
> +		return ret;
> +
> +	ret = k3_m4_rproc_release(kproc);
> +	if (ret)
> +		goto put_mbox;
> +
> +	return 0;
> +
> +put_mbox:
> +	mbox_free_channel(kproc->mbox);
> +	return ret;
> +}
> +
> +/*
> + * Stop the M4 remote processor.
> + *
> + * This function puts the M4 processor into reset, and finishes processing
> + * of any pending messages. This callback is invoked only in remoteproc mode.
> + */
> +static int k3_m4_rproc_stop(struct rproc *rproc)
> +{
> +	struct k3_m4_rproc *kproc = rproc->priv;
> +
> +	mbox_free_channel(kproc->mbox);
> +
> +	k3_m4_rproc_reset(kproc);
> +
> +	return 0;
> +}
> +
> +/*
> + * Attach to a running M4 remote processor (IPC-only mode)
> + *
> + * This rproc attach callback only needs to request the mailbox, the remote
> + * processor is already booted, so there is no need to issue any TI-SCI
> + * commands to boot the M4 core. This callback is used only in IPC-only mode.
> + */
> +static int k3_m4_rproc_attach(struct rproc *rproc)
> +{
> +	struct k3_m4_rproc *kproc = rproc->priv;
> +	struct device *dev = kproc->dev;
> +	int ret;
> +
> +	ret = k3_m4_rproc_request_mbox(rproc);
> +	if (ret)
> +		return ret;
> +
> +	dev_info(dev, "M4 initialized in IPC-only mode\n");
> +	return 0;
> +}
> +
> +/*
> + * Detach from a running M4 remote processor (IPC-only mode)
> + *
> + * This rproc detach callback performs the opposite operation to attach callback
> + * and only needs to release the mailbox, the M4 core is not stopped and will
> + * be left to continue to run its booted firmware. This callback is invoked only in
> + * IPC-only mode.
> + */
> +static int k3_m4_rproc_detach(struct rproc *rproc)
> +{
> +	struct k3_m4_rproc *kproc = rproc->priv;
> +	struct device *dev = kproc->dev;
> +
> +	mbox_free_channel(kproc->mbox);
> +	dev_info(dev, "M4 deinitialized in IPC-only mode\n");
> +	return 0;
> +}
> +
> +static const struct rproc_ops k3_m4_rproc_ops = {
> +	.start		= k3_m4_rproc_start,
> +	.stop		= k3_m4_rproc_stop,
> +	.attach		= k3_m4_rproc_attach,
> +	.detach		= k3_m4_rproc_detach,
> +	.kick		= k3_m4_rproc_kick,
> +	.da_to_va	= k3_m4_rproc_da_to_va,
> +	.get_loaded_rsc_table = k3_m4_get_loaded_rsc_table,
> +};
> +
> +static int k3_m4_rproc_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct device_node *np = dev->of_node;
> +	const struct k3_m4_rproc_dev_data *data;
> +	struct k3_m4_rproc *kproc;
> +	struct rproc *rproc;
> +	const char *fw_name;
> +	bool r_state = false;
> +	bool p_state = false;
> +	int ret = 0;
> +
> +	data = device_get_match_data(dev);
> +	if (!data)
> +		return -ENODEV;
> +
> +	ret = rproc_of_parse_firmware(dev, 0, &fw_name);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "failed to parse firmware-name property\n");
> +
> +	rproc = devm_rproc_alloc(dev, dev_name(dev), &k3_m4_rproc_ops, fw_name,
> +				 sizeof(*kproc));
> +	if (!rproc)
> +		return -ENOMEM;
> +
> +	rproc->has_iommu = false;
> +	rproc->recovery_disabled = true;
> +	if (data->uses_lreset) {
> +		rproc->ops->prepare = k3_m4_rproc_prepare;
> +		rproc->ops->unprepare = k3_m4_rproc_unprepare;
> +	}
> +	kproc = rproc->priv;
> +	kproc->rproc = rproc;
> +	kproc->dev = dev;
> +	kproc->data = data;
> +
> +	kproc->ti_sci = devm_ti_sci_get_by_phandle(dev, "ti,sci");
> +	if (IS_ERR(kproc->ti_sci))
> +		return dev_err_probe(dev, PTR_ERR(kproc->ti_sci),
> +				     "failed to get ti-sci handle\n");
> +
> +	ret = of_property_read_u32(np, "ti,sci-dev-id", &kproc->ti_sci_id);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "missing 'ti,sci-dev-id' property\n");
> +
> +	kproc->reset = devm_reset_control_get_exclusive(dev, NULL);
> +	if (IS_ERR(kproc->reset))
> +		return dev_err_probe(dev, PTR_ERR(kproc->reset), "failed to get reset\n");

What happens when devm_reset_control_get_exclusive() returns NULL?

> +
> +	kproc->tsp = k3_m4_rproc_of_get_tsp(dev, kproc->ti_sci);
> +	if (IS_ERR(kproc->tsp))
> +		return dev_err_probe(dev, PTR_ERR(kproc->tsp),
> +				     "failed to construct ti-sci proc control\n");
> +
> +	ret = ti_sci_proc_request(kproc->tsp);
> +	if (ret < 0)
> +		return dev_err_probe(dev, ret, "ti_sci_proc_request failed\n");
> +	ret = devm_add_action_or_reset(dev, k3_m4_release_tsp, kproc->tsp);
> +	if (ret)
> +		return ret;
> +
> +	ret = k3_m4_rproc_of_get_memories(pdev, kproc);
> +	if (ret)
> +		return ret;
> +
> +	ret = k3_m4_reserved_mem_init(kproc);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "reserved memory init failed\n");
> +
> +	ret = kproc->ti_sci->ops.dev_ops.is_on(kproc->ti_sci, kproc->ti_sci_id,
> +					       &r_state, &p_state);
> +	if (ret)
> +		return dev_err_probe(dev, ret,
> +				     "failed to get initial state, mode cannot be determined\n");
> +
> +	/* configure devices for either remoteproc or IPC-only mode */
> +	if (p_state) {
> +		dev_info(dev, "configured M4 for IPC-only mode\n");
> +		rproc->state = RPROC_DETACHED;
> +		/* override rproc ops with only required IPC-only mode ops */
> +		rproc->ops->prepare = NULL;
> +		rproc->ops->unprepare = NULL;
> +		rproc->ops->start = NULL;
> +		rproc->ops->stop = NULL;
> +		rproc->ops->attach = k3_m4_rproc_attach;
> +		rproc->ops->detach = k3_m4_rproc_detach;
> +		rproc->ops->get_loaded_rsc_table = k3_m4_get_loaded_rsc_table;

Why are the last 3 assignment needed when they are already set in the
declaration of k3_m4_rproc_ops?

> +	} else {
> +		dev_info(dev, "configured M4 for remoteproc mode\n");
> +		/*
> +		 * ensure the M4 local reset is asserted to ensure the core
> +		 * doesn't execute bogus code in .prepare() when the module
> +		 * reset is released.
> +		 */
> +		if (data->uses_lreset) {
> +			ret = reset_control_status(kproc->reset);
> +			if (ret < 0) {
> +				return dev_err_probe(dev, ret, "failed to get reset status\n");
> +			} else if (ret == 0) {
> +				dev_warn(dev, "local reset is deasserted for device\n");
> +				k3_m4_rproc_reset(kproc);
> +			}
> +		}
> +	}
> +
> +	ret = devm_rproc_add(dev, rproc);
> +	if (ret)
> +		return dev_err_probe(dev, ret,
> +				     "failed to add register device with remoteproc core\n");
> +
> +	return 0;
> +}
> +
> +static const struct k3_m4_rproc_mem_data am64_m4_mems[] = {
> +	{ .name = "iram", .dev_addr = 0x0 },
> +	{ .name = "dram", .dev_addr = 0x30000 },
> +};

Is this hardcoded in the hardware and never expected to change?  If not please
add to the DT bindings.

More comments later or tomorrow.

Thanks,
Mathieu

> +
> +static const struct k3_m4_rproc_dev_data am64_m4_data = {
> +	.mems = am64_m4_mems,
> +	.num_mems = ARRAY_SIZE(am64_m4_mems),
> +	.uses_lreset = true,
> +};
> +
> +static const struct of_device_id k3_m4_of_match[] = {
> +	{ .compatible = "ti,am64-m4fss", .data = &am64_m4_data, },
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, k3_m4_of_match);
> +
> +static struct platform_driver k3_m4_rproc_driver = {
> +	.probe	= k3_m4_rproc_probe,
> +	.driver	= {
> +		.name = "k3-m4-rproc",
> +		.of_match_table = k3_m4_of_match,
> +	},
> +};
> +module_platform_driver(k3_m4_rproc_driver);
> +
> +MODULE_AUTHOR("Hari Nagalla <hnagalla@ti.com>");
> +MODULE_DESCRIPTION("TI K3 M4 Remoteproc driver");
> +MODULE_LICENSE("GPL");
> -- 
> 2.39.2
> 

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Re: [PATCH v9 2/5] remoteproc: k3-m4: Add a remoteproc driver for M4F subsystem

[Andrew Davis]

On 5/6/24 3:46 PM, Mathieu Poirier wrote:
> Good day,
> 
> I have started reviewing this patchset.  Comments will be scattered over
> multiple days and as such, I will explicitly inform you when  am done with the
> review.
> 
> On Fri, Apr 26, 2024 at 02:18:08PM -0500, Andrew Davis wrote:
>> From: Martyn Welch <martyn.welch@collabora.com>
>>
>> The AM62x and AM64x SoCs of the TI K3 family has a Cortex M4F core in
>> the MCU domain. This core is typically used for safety applications in a
>> stand alone mode. However, some application (non safety related) may
>> want to use the M4F core as a generic remote processor with IPC to the
>> host processor. The M4F core has internal IRAM and DRAM memories and are
>> exposed to the system bus for code and data loading.
>>
>> A remote processor driver is added to support this subsystem, including
>> being able to load and boot the M4F core. Loading includes to M4F
>> internal memories and predefined external code/data memories. The
>> carve outs for external contiguous memory is defined in the M4F device
>> node and should match with the external memory declarations in the M4F
>> image binary. The M4F subsystem has two resets. One reset is for the
>> entire subsystem i.e including the internal memories and the other, a
>> local reset is only for the M4F processing core. When loading the image,
>> the driver first releases the subsystem reset, loads the firmware image
>> and then releases the local reset to let the M4F processing core run.
>>
>> Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
>> Signed-off-by: Hari Nagalla <hnagalla@ti.com>
>> Signed-off-by: Andrew Davis <afd@ti.com>
>> ---
>>   drivers/remoteproc/Kconfig               |  13 +
>>   drivers/remoteproc/Makefile              |   1 +
>>   drivers/remoteproc/ti_k3_m4_remoteproc.c | 785 +++++++++++++++++++++++
>>   3 files changed, 799 insertions(+)
>>   create mode 100644 drivers/remoteproc/ti_k3_m4_remoteproc.c
>>
>> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
>> index 48845dc8fa852..1a7c0330c91a9 100644
>> --- a/drivers/remoteproc/Kconfig
>> +++ b/drivers/remoteproc/Kconfig
>> @@ -339,6 +339,19 @@ config TI_K3_DSP_REMOTEPROC
>>   	  It's safe to say N here if you're not interested in utilizing
>>   	  the DSP slave processors.
>>   
>> +config TI_K3_M4_REMOTEPROC
>> +	tristate "TI K3 M4 remoteproc support"
>> +	depends on ARCH_K3 || COMPILE_TEST
>> +	select MAILBOX
>> +	select OMAP2PLUS_MBOX
>> +	help
>> +	  Say m here to support TI's M4 remote processor subsystems
>> +	  on various TI K3 family of SoCs through the remote processor
>> +	  framework.
>> +
>> +	  It's safe to say N here if you're not interested in utilizing
>> +	  a remote processor.
>> +
>>   config TI_K3_R5_REMOTEPROC
>>   	tristate "TI K3 R5 remoteproc support"
>>   	depends on ARCH_K3
>> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
>> index 91314a9b43cef..5ff4e2fee4abd 100644
>> --- a/drivers/remoteproc/Makefile
>> +++ b/drivers/remoteproc/Makefile
>> @@ -37,5 +37,6 @@ obj-$(CONFIG_ST_REMOTEPROC)		+= st_remoteproc.o
>>   obj-$(CONFIG_ST_SLIM_REMOTEPROC)	+= st_slim_rproc.o
>>   obj-$(CONFIG_STM32_RPROC)		+= stm32_rproc.o
>>   obj-$(CONFIG_TI_K3_DSP_REMOTEPROC)	+= ti_k3_dsp_remoteproc.o
>> +obj-$(CONFIG_TI_K3_M4_REMOTEPROC)	+= ti_k3_m4_remoteproc.o
>>   obj-$(CONFIG_TI_K3_R5_REMOTEPROC)	+= ti_k3_r5_remoteproc.o
>>   obj-$(CONFIG_XLNX_R5_REMOTEPROC)	+= xlnx_r5_remoteproc.o
>> diff --git a/drivers/remoteproc/ti_k3_m4_remoteproc.c b/drivers/remoteproc/ti_k3_m4_remoteproc.c
>> new file mode 100644
>> index 0000000000000..0030e509f6b5d
>> --- /dev/null
>> +++ b/drivers/remoteproc/ti_k3_m4_remoteproc.c
>> @@ -0,0 +1,785 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * TI K3 Cortex-M4 Remote Processor(s) driver
>> + *
>> + * Copyright (C) 2021-2024 Texas Instruments Incorporated - https://www.ti.com/
>> + *	Hari Nagalla <hnagalla@ti.com>
>> + */
>> +
>> +#include <linux/io.h>
>> +#include <linux/mailbox_client.h>
>> +#include <linux/module.h>
>> +#include <linux/of_address.h>
>> +#include <linux/of_reserved_mem.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/remoteproc.h>
>> +#include <linux/reset.h>
>> +#include <linux/slab.h>
>> +
>> +#include "omap_remoteproc.h"
>> +#include "remoteproc_internal.h"
>> +#include "ti_sci_proc.h"
>> +
>> +/**
>> + * struct k3_m4_rproc_mem - internal memory structure
>> + * @cpu_addr: MPU virtual address of the memory region
>> + * @bus_addr: Bus address used to access the memory region
>> + * @dev_addr: Device address of the memory region from remote processor view
>> + * @size: Size of the memory region
>> + */
>> +struct k3_m4_rproc_mem {
>> +	void __iomem *cpu_addr;
>> +	phys_addr_t bus_addr;
>> +	u32 dev_addr;
>> +	size_t size;
>> +};
>> +
>> +/**
>> + * struct k3_m4_rproc_mem_data - memory definitions for a remote processor
>> + * @name: name for this memory entry
>> + * @dev_addr: device address for the memory entry
>> + */
>> +struct k3_m4_rproc_mem_data {
>> +	const char *name;
>> +	const u32 dev_addr;
>> +};
>> +
>> +/**
>> + * struct k3_m4_rproc_dev_data - device data structure for a remote processor
>> + * @mems: pointer to memory definitions for a remote processor
>> + * @num_mems: number of memory regions in @mems
>> + * @uses_lreset: flag to denote the need for local reset management
>> + */
>> +struct k3_m4_rproc_dev_data {
>> +	const struct k3_m4_rproc_mem_data *mems;
>> +	u32 num_mems;
>> +	bool uses_lreset;
>> +};
>> +
>> +/**
>> + * struct k3_m4_rproc - k3 remote processor driver structure
>> + * @dev: cached device pointer
>> + * @rproc: remoteproc device handle
>> + * @mem: internal memory regions data
>> + * @num_mems: number of internal memory regions
>> + * @rmem: reserved memory regions data
>> + * @num_rmems: number of reserved memory regions
>> + * @reset: reset control handle
>> + * @data: pointer to device data
>> + * @tsp: TI-SCI processor control handle
>> + * @ti_sci: TI-SCI handle
>> + * @ti_sci_id: TI-SCI device identifier
>> + * @mbox: mailbox channel handle
>> + * @client: mailbox client to request the mailbox channel
>> + */
>> +struct k3_m4_rproc {
>> +	struct device *dev;
>> +	struct rproc *rproc;
>> +	struct k3_m4_rproc_mem *mem;
>> +	int num_mems;
>> +	struct k3_m4_rproc_mem *rmem;
>> +	int num_rmems;
>> +	struct reset_control *reset;
>> +	const struct k3_m4_rproc_dev_data *data;
>> +	struct ti_sci_proc *tsp;
>> +	const struct ti_sci_handle *ti_sci;
>> +	u32 ti_sci_id;
>> +	struct mbox_chan *mbox;
>> +	struct mbox_client client;
>> +};
>> +
>> +/**
>> + * k3_m4_rproc_mbox_callback() - inbound mailbox message handler
>> + * @client: mailbox client pointer used for requesting the mailbox channel
>> + * @data: mailbox payload
>> + *
>> + * This handler is invoked by the K3 mailbox driver whenever a mailbox
>> + * message is received. Usually, the mailbox payload simply contains
>> + * the index of the virtqueue that is kicked by the remote processor,
>> + * and we let remoteproc core handle it.
>> + *
>> + * In addition to virtqueue indices, we also have some out-of-band values
>> + * that indicate different events. Those values are deliberately very
>> + * large so they don't coincide with virtqueue indices.
>> + */
>> +static void k3_m4_rproc_mbox_callback(struct mbox_client *client, void *data)
>> +{
>> +	struct k3_m4_rproc *kproc = container_of(client, struct k3_m4_rproc,
>> +						  client);
>> +	struct device *dev = kproc->rproc->dev.parent;
>> +	const char *name = kproc->rproc->name;
>> +	u32 msg = (u32)(uintptr_t)(data);
>> +
>> +	dev_dbg(dev, "mbox msg: 0x%x\n", msg);
>> +
>> +	switch (msg) {
>> +	case RP_MBOX_CRASH:
>> +		/*
>> +		 * remoteproc detected an exception, but error recovery is not
>> +		 * supported. So, just log this for now
>> +		 */
>> +		dev_err(dev, "K3 rproc %s crashed\n", name);
>> +		break;
>> +	case RP_MBOX_ECHO_REPLY:
>> +		dev_info(dev, "received echo reply from %s\n", name);
>> +		break;
>> +	default:
>> +		/* silently handle all other valid messages */
>> +		if (msg >= RP_MBOX_READY && msg < RP_MBOX_END_MSG)
>> +			return;
>> +		if (msg > kproc->rproc->max_notifyid) {
>> +			dev_dbg(dev, "dropping unknown message 0x%x", msg);
>> +			return;
>> +		}
>> +		/* msg contains the index of the triggered vring */
>> +		if (rproc_vq_interrupt(kproc->rproc, msg) == IRQ_NONE)
>> +			dev_dbg(dev, "no message was found in vqid %d\n", msg);
>> +	}
>> +}
>> +
>> +/*
>> + * Kick the remote processor to notify about pending unprocessed messages.
>> + * The vqid usage is not used and is inconsequential, as the kick is performed
>> + * through a simulated GPIO (a bit in an IPC interrupt-triggering register),
>> + * the remote processor is expected to process both its Tx and Rx virtqueues.
>> + */
>> +static void k3_m4_rproc_kick(struct rproc *rproc, int vqid)
>> +{
>> +	struct k3_m4_rproc *kproc = rproc->priv;
>> +	struct device *dev = rproc->dev.parent;
>> +	u32 msg = (u32)vqid;
>> +	int ret;
>> +
>> +	/* send the index of the triggered virtqueue in the mailbox payload */
>> +	ret = mbox_send_message(kproc->mbox, (void *)(uintptr_t)msg);
>> +	if (ret < 0)
>> +		dev_err(dev, "failed to send mailbox message, status = %d\n",
>> +			ret);
>> +}
>> +
>> +/* Put the remote processor into reset */
>> +static int k3_m4_rproc_reset(struct k3_m4_rproc *kproc)
>> +{
>> +	struct device *dev = kproc->dev;
>> +	int ret;
>> +
>> +	ret = reset_control_assert(kproc->reset);
>> +	if (ret) {
>> +		dev_err(dev, "local-reset assert failed, ret = %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	if (kproc->data->uses_lreset)
>> +		return ret;
>> +
>> +	ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
>> +						    kproc->ti_sci_id);
>> +	if (ret) {
>> +		dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
>> +		if (reset_control_deassert(kproc->reset))
>> +			dev_warn(dev, "local-reset deassert back failed\n");
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +/* Release the remote processor from reset */
>> +static int k3_m4_rproc_release(struct k3_m4_rproc *kproc)
>> +{
>> +	struct device *dev = kproc->dev;
>> +	int ret;
>> +
>> +	if (kproc->data->uses_lreset)
>> +		goto lreset;
>> +
>> +	ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
>> +						    kproc->ti_sci_id);
>> +	if (ret) {
>> +		dev_err(dev, "module-reset deassert failed, ret = %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +lreset:
>> +	ret = reset_control_deassert(kproc->reset);
>> +	if (ret) {
>> +		dev_err(dev, "local-reset deassert failed, ret = %d\n", ret);
>> +		if (kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
>> +							  kproc->ti_sci_id))
>> +			dev_warn(dev, "module-reset assert back failed\n");
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +static int k3_m4_rproc_request_mbox(struct rproc *rproc)
>> +{
>> +	struct k3_m4_rproc *kproc = rproc->priv;
>> +	struct mbox_client *client = &kproc->client;
>> +	struct device *dev = kproc->dev;
>> +	int ret;
>> +
>> +	client->dev = dev;
>> +	client->tx_done = NULL;
>> +	client->rx_callback = k3_m4_rproc_mbox_callback;
>> +	client->tx_block = false;
>> +	client->knows_txdone = false;
>> +
>> +	kproc->mbox = mbox_request_channel(client, 0);
>> +	if (IS_ERR(kproc->mbox)) {
>> +		ret = -EBUSY;
>> +		dev_err(dev, "mbox_request_channel failed: %ld\n",
>> +			PTR_ERR(kproc->mbox));
>> +		return ret;
>> +	}
>> +
>> +	/*
>> +	 * Ping the remote processor, this is only for sanity-sake for now;
>> +	 * there is no functional effect whatsoever.
>> +	 *
>> +	 * Note that the reply will _not_ arrive immediately: this message
>> +	 * will wait in the mailbox fifo until the remote processor is booted.
>> +	 */
>> +	ret = mbox_send_message(kproc->mbox, (void *)RP_MBOX_ECHO_REQUEST);
>> +	if (ret < 0) {
>> +		dev_err(dev, "mbox_send_message failed: %d\n", ret);
>> +		mbox_free_channel(kproc->mbox);
>> +		return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +/*
>> + * The M4 cores have a local reset that affects only the CPU, and a
>> + * generic module reset that powers on the device and allows the internal
>> + * memories to be accessed while the local reset is asserted. This function is
>> + * used to release the global reset on remote cores to allow loading into the
>> + * internal RAMs. The .prepare() ops is invoked by remoteproc core before any
>> + * firmware loading, and is followed by the .start() ops after loading to
>> + * actually let the remote cores to run. This callback is invoked only in
>> + * remoteproc mode.
>> + */
>> +static int k3_m4_rproc_prepare(struct rproc *rproc)
>> +{
>> +	struct k3_m4_rproc *kproc = rproc->priv;
>> +	struct device *dev = kproc->dev;
>> +	int ret;
>> +
>> +	ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
>> +						    kproc->ti_sci_id);
>> +	if (ret)
>> +		dev_err(dev, "module-reset deassert failed, cannot enable internal RAM loading, ret = %d\n",
>> +			ret);
>> +
>> +	return ret;
>> +}
>> +
>> +/*
>> + * This function implements the .unprepare() ops and performs the complimentary
>> + * operations to that of the .prepare() ops. The function is used to assert the
>> + * global reset on applicable cores. This completes the second portion of
>> + * powering down the remote core. The cores themselves are only halted in the
>> + * .stop() callback through the local reset, and the .unprepare() ops is invoked
>> + * by the remoteproc core after the remoteproc is stopped to balance the global
>> + * reset. This callback is invoked only in remoteproc mode.
>> + */
>> +static int k3_m4_rproc_unprepare(struct rproc *rproc)
>> +{
>> +	struct k3_m4_rproc *kproc = rproc->priv;
>> +	struct device *dev = kproc->dev;
>> +	int ret;
>> +
>> +	ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
>> +						    kproc->ti_sci_id);
>> +	if (ret)
>> +		dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
>> +
>> +	return ret;
>> +}
>> +
>> +/*
>> + * This function implements the .get_loaded_rsc_table() callback and is used
>> + * to provide the resource table for a booted remote processor in IPC-only
>> + * mode. The remote processor firmwares follow a design-by-contract approach
>> + * and are expected to have the resource table at the base of the DDR region
>> + * reserved for firmware usage. This provides flexibility for the remote
>> + * processor to be booted by different bootloaders that may or may not have the
>> + * ability to publish the resource table address and size through a DT
>> + * property.
>> + */
>> +static struct resource_table *k3_m4_get_loaded_rsc_table(struct rproc *rproc,
>> +							 size_t *rsc_table_sz)
>> +{
>> +	struct k3_m4_rproc *kproc = rproc->priv;
>> +	struct device *dev = kproc->dev;
>> +
>> +	if (!kproc->rmem[0].cpu_addr) {
>> +		dev_err(dev, "memory-region #1 does not exist, loaded rsc table can't be found");
>> +		return ERR_PTR(-ENOMEM);
>> +	}
>> +
>> +	/*
>> +	 * NOTE: The resource table size is currently hard-coded to a maximum
>> +	 * of 256 bytes. The most common resource table usage for K3 firmwares
>> +	 * is to only have the vdev resource entry and an optional trace entry.
>> +	 * The exact size could be computed based on resource table address, but
>> +	 * the hard-coded value suffices to support the IPC-only mode.
>> +	 */
>> +	*rsc_table_sz = 256;
>> +	return (__force struct resource_table *)kproc->rmem[0].cpu_addr;
>> +}
>> +
>> +/*
>> + * Custom function to translate a remote processor device address (internal
>> + * RAMs only) to a kernel virtual address.  The remote processors can access
>> + * their RAMs at either an internal address visible only from a remote
>> + * processor, or at the SoC-level bus address. Both these addresses need to be
>> + * looked through for translation. The translated addresses can be used either
>> + * by the remoteproc core for loading (when using kernel remoteproc loader), or
>> + * by any rpmsg bus drivers.
>> + */
>> +static void *k3_m4_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
>> +{
>> +	struct k3_m4_rproc *kproc = rproc->priv;
>> +	void __iomem *va = NULL;
>> +	phys_addr_t bus_addr;
>> +	u32 dev_addr, offset;
>> +	size_t size;
>> +	int i;
>> +
>> +	if (len == 0)
>> +		return NULL;
>> +
>> +	for (i = 0; i < kproc->num_mems; i++) {
>> +		bus_addr = kproc->mem[i].bus_addr;
>> +		dev_addr = kproc->mem[i].dev_addr;
>> +		size = kproc->mem[i].size;
>> +
>> +		/* handle M4-view addresses */
>> +		if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
>> +			offset = da - dev_addr;
>> +			va = kproc->mem[i].cpu_addr + offset;
>> +			return (__force void *)va;
>> +		}
>> +
>> +		/* handle SoC-view addresses */
>> +		if (da >= bus_addr && ((da + len) <= (bus_addr + size))) {
>> +			offset = da - bus_addr;
>> +			va = kproc->mem[i].cpu_addr + offset;
>> +			return (__force void *)va;
>> +		}
>> +	}
>> +
>> +	/* handle static DDR reserved memory regions */
>> +	for (i = 0; i < kproc->num_rmems; i++) {
>> +		dev_addr = kproc->rmem[i].dev_addr;
>> +		size = kproc->rmem[i].size;
>> +
>> +		if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
>> +			offset = da - dev_addr;
>> +			va = kproc->rmem[i].cpu_addr + offset;
>> +			return (__force void *)va;
>> +		}
>> +	}
>> +
>> +	return NULL;
>> +}
>> +
>> +static int k3_m4_rproc_of_get_memories(struct platform_device *pdev,
>> +				       struct k3_m4_rproc *kproc)
>> +{
>> +	const struct k3_m4_rproc_dev_data *data = kproc->data;
>> +	struct device *dev = &pdev->dev;
>> +	struct resource *res;
>> +	int num_mems = 0;
>> +	int i;
>> +
>> +	num_mems = kproc->data->num_mems;
>> +	kproc->mem = devm_kcalloc(kproc->dev, num_mems,
>> +				  sizeof(*kproc->mem), GFP_KERNEL);
>> +	if (!kproc->mem)
>> +		return -ENOMEM;
>> +
>> +	for (i = 0; i < num_mems; i++) {
>> +		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
>> +						   data->mems[i].name);
>> +		if (!res) {
>> +			dev_err(dev, "found no memory resource for %s\n",
>> +				data->mems[i].name);
>> +			return -EINVAL;
>> +		}
>> +		if (!devm_request_mem_region(dev, res->start,
>> +					     resource_size(res),
>> +					     dev_name(dev))) {
>> +			dev_err(dev, "could not request %s region for resource\n",
>> +				data->mems[i].name);
>> +			return -EBUSY;
>> +		}
>> +
>> +		kproc->mem[i].cpu_addr = devm_ioremap_wc(dev, res->start,
>> +							 resource_size(res));
>> +		if (!kproc->mem[i].cpu_addr) {
>> +			dev_err(dev, "failed to map %s memory\n",
>> +				data->mems[i].name);
>> +			return -ENOMEM;
>> +		}
>> +		kproc->mem[i].bus_addr = res->start;
>> +		kproc->mem[i].dev_addr = data->mems[i].dev_addr;
>> +		kproc->mem[i].size = resource_size(res);
>> +
>> +		dev_dbg(dev, "memory %8s: bus addr %pa size 0x%zx va %pK da 0x%x\n",
>> +			data->mems[i].name, &kproc->mem[i].bus_addr,
>> +			kproc->mem[i].size, kproc->mem[i].cpu_addr,
>> +			kproc->mem[i].dev_addr);
>> +	}
>> +	kproc->num_mems = num_mems;
>> +
>> +	return 0;
>> +}
>> +
>> +static void k3_m4_rproc_dev_mem_release(void *data)
>> +{
>> +	struct device *dev = data;
>> +
>> +	of_reserved_mem_device_release(dev);
>> +}
>> +
>> +static int k3_m4_reserved_mem_init(struct k3_m4_rproc *kproc)
>> +{
>> +	struct device *dev = kproc->dev;
>> +	struct device_node *np = dev->of_node;
>> +	struct device_node *rmem_np;
>> +	struct reserved_mem *rmem;
>> +	int num_rmems;
>> +	int ret, i;
>> +
>> +	num_rmems = of_property_count_elems_of_size(np, "memory-region",
>> +						    sizeof(phandle));
>> +	if (num_rmems < 0) {
>> +		dev_err(dev, "device does not reserved memory regions (%pe)\n",
>> +			ERR_PTR(num_rmems));
>> +		return -EINVAL;
>> +	}
>> +	if (num_rmems < 2) {
>> +		dev_err(dev, "device needs at least two memory regions to be defined, num = %d\n",
>> +			num_rmems);
>> +		return -EINVAL;
>> +	}
>> +
>> +	/* use reserved memory region 0 for vring DMA allocations */
>> +	ret = of_reserved_mem_device_init_by_idx(dev, np, 0);
>> +	if (ret) {
>> +		dev_err(dev, "device cannot initialize DMA pool (%pe)\n",
>> +			ERR_PTR(ret));
>> +		return ret;
>> +	}
>> +	ret = devm_add_action_or_reset(dev, k3_m4_rproc_dev_mem_release, dev);
>> +	if (ret)
>> +		return ret;
>> +
>> +	num_rmems--;
>> +	kproc->rmem = devm_kcalloc(dev, num_rmems, sizeof(*kproc->rmem), GFP_KERNEL);
>> +	if (!kproc->rmem)
>> +		return -ENOMEM;
>> +
>> +	/* use remaining reserved memory regions for static carveouts */
>> +	for (i = 0; i < num_rmems; i++) {
>> +		rmem_np = of_parse_phandle(np, "memory-region", i + 1);
>> +		if (!rmem_np)
>> +			return -EINVAL;
>> +
>> +		rmem = of_reserved_mem_lookup(rmem_np);
>> +		if (!rmem) {
>> +			of_node_put(rmem_np);
>> +			return -EINVAL;
>> +		}
>> +		of_node_put(rmem_np);
>> +
>> +		kproc->rmem[i].bus_addr = rmem->base;
>> +		/* 64-bit address regions currently not supported */
>> +		kproc->rmem[i].dev_addr = (u32)rmem->base;
>> +		kproc->rmem[i].size = rmem->size;
>> +		kproc->rmem[i].cpu_addr = devm_ioremap_wc(dev, rmem->base, rmem->size);
>> +		if (!kproc->rmem[i].cpu_addr) {
>> +			dev_err(dev, "failed to map reserved memory#%d at %pa of size %pa\n",
>> +				i + 1, &rmem->base, &rmem->size);
>> +			return -ENOMEM;
>> +		}
>> +
>> +		dev_dbg(dev, "reserved memory%d: bus addr %pa size 0x%zx va %pK da 0x%x\n",
>> +			i + 1, &kproc->rmem[i].bus_addr,
>> +			kproc->rmem[i].size, kproc->rmem[i].cpu_addr,
>> +			kproc->rmem[i].dev_addr);
>> +	}
>> +	kproc->num_rmems = num_rmems;
>> +
>> +	return 0;
>> +}
>> +
>> +static struct ti_sci_proc *k3_m4_rproc_of_get_tsp(struct device *dev,
>> +						  const struct ti_sci_handle *sci)
>> +{
>> +	struct ti_sci_proc *tsp;
>> +	u32 temp[2];
>> +	int ret;
>> +
>> +	ret = of_property_read_u32_array(dev->of_node, "ti,sci-proc-ids",
>> +					 temp, 2);
>> +	if (ret < 0)
>> +		return ERR_PTR(ret);
>> +
>> +	tsp = devm_kzalloc(dev, sizeof(*tsp), GFP_KERNEL);
>> +	if (!tsp)
>> +		return ERR_PTR(-ENOMEM);
>> +
>> +	tsp->dev = dev;
>> +	tsp->sci = sci;
>> +	tsp->ops = &sci->ops.proc_ops;
>> +	tsp->proc_id = temp[0];
>> +	tsp->host_id = temp[1];
>> +
>> +	return tsp;
>> +}
>> +
>> +static void k3_m4_release_tsp(void *data)
>> +{
>> +	struct ti_sci_proc *tsp = data;
>> +
>> +	ti_sci_proc_release(tsp);
>> +}
>> +
>> +/*
>> + * Power up the M4F remote processor.
>> + *
>> + * This function will be invoked only after the firmware for this rproc
>> + * was loaded, parsed successfully, and all of its resource requirements
>> + * were met. This callback is invoked only in remoteproc mode.
>> + */
>> +static int k3_m4_rproc_start(struct rproc *rproc)
>> +{
>> +	struct k3_m4_rproc *kproc = rproc->priv;
>> +	int ret;
>> +
>> +	ret = k3_m4_rproc_request_mbox(rproc);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = k3_m4_rproc_release(kproc);
>> +	if (ret)
>> +		goto put_mbox;
>> +
>> +	return 0;
>> +
>> +put_mbox:
>> +	mbox_free_channel(kproc->mbox);
>> +	return ret;
>> +}
>> +
>> +/*
>> + * Stop the M4 remote processor.
>> + *
>> + * This function puts the M4 processor into reset, and finishes processing
>> + * of any pending messages. This callback is invoked only in remoteproc mode.
>> + */
>> +static int k3_m4_rproc_stop(struct rproc *rproc)
>> +{
>> +	struct k3_m4_rproc *kproc = rproc->priv;
>> +
>> +	mbox_free_channel(kproc->mbox);
>> +
>> +	k3_m4_rproc_reset(kproc);
>> +
>> +	return 0;
>> +}
>> +
>> +/*
>> + * Attach to a running M4 remote processor (IPC-only mode)
>> + *
>> + * This rproc attach callback only needs to request the mailbox, the remote
>> + * processor is already booted, so there is no need to issue any TI-SCI
>> + * commands to boot the M4 core. This callback is used only in IPC-only mode.
>> + */
>> +static int k3_m4_rproc_attach(struct rproc *rproc)
>> +{
>> +	struct k3_m4_rproc *kproc = rproc->priv;
>> +	struct device *dev = kproc->dev;
>> +	int ret;
>> +
>> +	ret = k3_m4_rproc_request_mbox(rproc);
>> +	if (ret)
>> +		return ret;
>> +
>> +	dev_info(dev, "M4 initialized in IPC-only mode\n");
>> +	return 0;
>> +}
>> +
>> +/*
>> + * Detach from a running M4 remote processor (IPC-only mode)
>> + *
>> + * This rproc detach callback performs the opposite operation to attach callback
>> + * and only needs to release the mailbox, the M4 core is not stopped and will
>> + * be left to continue to run its booted firmware. This callback is invoked only in
>> + * IPC-only mode.
>> + */
>> +static int k3_m4_rproc_detach(struct rproc *rproc)
>> +{
>> +	struct k3_m4_rproc *kproc = rproc->priv;
>> +	struct device *dev = kproc->dev;
>> +
>> +	mbox_free_channel(kproc->mbox);
>> +	dev_info(dev, "M4 deinitialized in IPC-only mode\n");
>> +	return 0;
>> +}
>> +
>> +static const struct rproc_ops k3_m4_rproc_ops = {
>> +	.start		= k3_m4_rproc_start,
>> +	.stop		= k3_m4_rproc_stop,
>> +	.attach		= k3_m4_rproc_attach,
>> +	.detach		= k3_m4_rproc_detach,
>> +	.kick		= k3_m4_rproc_kick,
>> +	.da_to_va	= k3_m4_rproc_da_to_va,
>> +	.get_loaded_rsc_table = k3_m4_get_loaded_rsc_table,
>> +};
>> +
>> +static int k3_m4_rproc_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	struct device_node *np = dev->of_node;
>> +	const struct k3_m4_rproc_dev_data *data;
>> +	struct k3_m4_rproc *kproc;
>> +	struct rproc *rproc;
>> +	const char *fw_name;
>> +	bool r_state = false;
>> +	bool p_state = false;
>> +	int ret = 0;
>> +
>> +	data = device_get_match_data(dev);
>> +	if (!data)
>> +		return -ENODEV;
>> +
>> +	ret = rproc_of_parse_firmware(dev, 0, &fw_name);
>> +	if (ret)
>> +		return dev_err_probe(dev, ret, "failed to parse firmware-name property\n");
>> +
>> +	rproc = devm_rproc_alloc(dev, dev_name(dev), &k3_m4_rproc_ops, fw_name,
>> +				 sizeof(*kproc));
>> +	if (!rproc)
>> +		return -ENOMEM;
>> +
>> +	rproc->has_iommu = false;
>> +	rproc->recovery_disabled = true;
>> +	if (data->uses_lreset) {
>> +		rproc->ops->prepare = k3_m4_rproc_prepare;
>> +		rproc->ops->unprepare = k3_m4_rproc_unprepare;
>> +	}
>> +	kproc = rproc->priv;
>> +	kproc->rproc = rproc;
>> +	kproc->dev = dev;
>> +	kproc->data = data;
>> +
>> +	kproc->ti_sci = devm_ti_sci_get_by_phandle(dev, "ti,sci");
>> +	if (IS_ERR(kproc->ti_sci))
>> +		return dev_err_probe(dev, PTR_ERR(kproc->ti_sci),
>> +				     "failed to get ti-sci handle\n");
>> +
>> +	ret = of_property_read_u32(np, "ti,sci-dev-id", &kproc->ti_sci_id);
>> +	if (ret)
>> +		return dev_err_probe(dev, ret, "missing 'ti,sci-dev-id' property\n");
>> +
>> +	kproc->reset = devm_reset_control_get_exclusive(dev, NULL);
>> +	if (IS_ERR(kproc->reset))
>> +		return dev_err_probe(dev, PTR_ERR(kproc->reset), "failed to get reset\n");
> 
> What happens when devm_reset_control_get_exclusive() returns NULL?
> 

Only the _optional_ version of this fuction can return NULL, this fuction
will always return an error if the reset cannot be taken.

>> +
>> +	kproc->tsp = k3_m4_rproc_of_get_tsp(dev, kproc->ti_sci);
>> +	if (IS_ERR(kproc->tsp))
>> +		return dev_err_probe(dev, PTR_ERR(kproc->tsp),
>> +				     "failed to construct ti-sci proc control\n");
>> +
>> +	ret = ti_sci_proc_request(kproc->tsp);
>> +	if (ret < 0)
>> +		return dev_err_probe(dev, ret, "ti_sci_proc_request failed\n");
>> +	ret = devm_add_action_or_reset(dev, k3_m4_release_tsp, kproc->tsp);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = k3_m4_rproc_of_get_memories(pdev, kproc);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = k3_m4_reserved_mem_init(kproc);
>> +	if (ret)
>> +		return dev_err_probe(dev, ret, "reserved memory init failed\n");
>> +
>> +	ret = kproc->ti_sci->ops.dev_ops.is_on(kproc->ti_sci, kproc->ti_sci_id,
>> +					       &r_state, &p_state);
>> +	if (ret)
>> +		return dev_err_probe(dev, ret,
>> +				     "failed to get initial state, mode cannot be determined\n");
>> +
>> +	/* configure devices for either remoteproc or IPC-only mode */
>> +	if (p_state) {
>> +		dev_info(dev, "configured M4 for IPC-only mode\n");
>> +		rproc->state = RPROC_DETACHED;
>> +		/* override rproc ops with only required IPC-only mode ops */
>> +		rproc->ops->prepare = NULL;
>> +		rproc->ops->unprepare = NULL;
>> +		rproc->ops->start = NULL;
>> +		rproc->ops->stop = NULL;
>> +		rproc->ops->attach = k3_m4_rproc_attach;
>> +		rproc->ops->detach = k3_m4_rproc_detach;
>> +		rproc->ops->get_loaded_rsc_table = k3_m4_get_loaded_rsc_table;
> 
> Why are the last 3 assignment needed when they are already set in the
> declaration of k3_m4_rproc_ops?
> 

Good point, seems none of these overrides should be needed, start()/stop()
are not called for ATTCHED/DETACHED cores anyway, opposite is true for attach()/detach().

I'll drop these overrides.

>> +	} else {
>> +		dev_info(dev, "configured M4 for remoteproc mode\n");
>> +		/*
>> +		 * ensure the M4 local reset is asserted to ensure the core
>> +		 * doesn't execute bogus code in .prepare() when the module
>> +		 * reset is released.
>> +		 */
>> +		if (data->uses_lreset) {
>> +			ret = reset_control_status(kproc->reset);
>> +			if (ret < 0) {
>> +				return dev_err_probe(dev, ret, "failed to get reset status\n");
>> +			} else if (ret == 0) {
>> +				dev_warn(dev, "local reset is deasserted for device\n");
>> +				k3_m4_rproc_reset(kproc);
>> +			}
>> +		}
>> +	}
>> +
>> +	ret = devm_rproc_add(dev, rproc);
>> +	if (ret)
>> +		return dev_err_probe(dev, ret,
>> +				     "failed to add register device with remoteproc core\n");
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct k3_m4_rproc_mem_data am64_m4_mems[] = {
>> +	{ .name = "iram", .dev_addr = 0x0 },
>> +	{ .name = "dram", .dev_addr = 0x30000 },
>> +};
> 
> Is this hardcoded in the hardware and never expected to change?  If not please
> add to the DT bindings.
> 

This is a hardware hardcoded address and will be the same for this class
of K3 M4 cores.

Thanks,
Andrew

> More comments later or tomorrow.
> 
> Thanks,
> Mathieu
> 
>> +
>> +static const struct k3_m4_rproc_dev_data am64_m4_data = {
>> +	.mems = am64_m4_mems,
>> +	.num_mems = ARRAY_SIZE(am64_m4_mems),
>> +	.uses_lreset = true,
>> +};
>> +
>> +static const struct of_device_id k3_m4_of_match[] = {
>> +	{ .compatible = "ti,am64-m4fss", .data = &am64_m4_data, },
>> +	{ /* sentinel */ },
>> +};
>> +MODULE_DEVICE_TABLE(of, k3_m4_of_match);
>> +
>> +static struct platform_driver k3_m4_rproc_driver = {
>> +	.probe	= k3_m4_rproc_probe,
>> +	.driver	= {
>> +		.name = "k3-m4-rproc",
>> +		.of_match_table = k3_m4_of_match,
>> +	},
>> +};
>> +module_platform_driver(k3_m4_rproc_driver);
>> +
>> +MODULE_AUTHOR("Hari Nagalla <hnagalla@ti.com>");
>> +MODULE_DESCRIPTION("TI K3 M4 Remoteproc driver");
>> +MODULE_LICENSE("GPL");
>> -- 
>> 2.39.2
>>

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Re: [PATCH v9 2/5] remoteproc: k3-m4: Add a remoteproc driver for M4F subsystem

[Mathieu Poirier]

On Wed, 8 May 2024 at 09:36, Andrew Davis <afd@ti.com> wrote:
>
> On 5/6/24 3:46 PM, Mathieu Poirier wrote:
> > Good day,
> >
> > I have started reviewing this patchset.  Comments will be scattered over
> > multiple days and as such, I will explicitly inform you when  am done with the
> > review.
> >
> > On Fri, Apr 26, 2024 at 02:18:08PM -0500, Andrew Davis wrote:
> >> From: Martyn Welch <martyn.welch@collabora.com>
> >>
> >> The AM62x and AM64x SoCs of the TI K3 family has a Cortex M4F core in
> >> the MCU domain. This core is typically used for safety applications in a
> >> stand alone mode. However, some application (non safety related) may
> >> want to use the M4F core as a generic remote processor with IPC to the
> >> host processor. The M4F core has internal IRAM and DRAM memories and are
> >> exposed to the system bus for code and data loading.
> >>
> >> A remote processor driver is added to support this subsystem, including
> >> being able to load and boot the M4F core. Loading includes to M4F
> >> internal memories and predefined external code/data memories. The
> >> carve outs for external contiguous memory is defined in the M4F device
> >> node and should match with the external memory declarations in the M4F
> >> image binary. The M4F subsystem has two resets. One reset is for the
> >> entire subsystem i.e including the internal memories and the other, a
> >> local reset is only for the M4F processing core. When loading the image,
> >> the driver first releases the subsystem reset, loads the firmware image
> >> and then releases the local reset to let the M4F processing core run.
> >>
> >> Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
> >> Signed-off-by: Hari Nagalla <hnagalla@ti.com>
> >> Signed-off-by: Andrew Davis <afd@ti.com>
> >> ---
> >>   drivers/remoteproc/Kconfig               |  13 +
> >>   drivers/remoteproc/Makefile              |   1 +
> >>   drivers/remoteproc/ti_k3_m4_remoteproc.c | 785 +++++++++++++++++++++++
> >>   3 files changed, 799 insertions(+)
> >>   create mode 100644 drivers/remoteproc/ti_k3_m4_remoteproc.c
> >>
> >> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> >> index 48845dc8fa852..1a7c0330c91a9 100644
> >> --- a/drivers/remoteproc/Kconfig
> >> +++ b/drivers/remoteproc/Kconfig
> >> @@ -339,6 +339,19 @@ config TI_K3_DSP_REMOTEPROC
> >>        It's safe to say N here if you're not interested in utilizing
> >>        the DSP slave processors.
> >>
> >> +config TI_K3_M4_REMOTEPROC
> >> +    tristate "TI K3 M4 remoteproc support"
> >> +    depends on ARCH_K3 || COMPILE_TEST
> >> +    select MAILBOX
> >> +    select OMAP2PLUS_MBOX
> >> +    help
> >> +      Say m here to support TI's M4 remote processor subsystems
> >> +      on various TI K3 family of SoCs through the remote processor
> >> +      framework.
> >> +
> >> +      It's safe to say N here if you're not interested in utilizing
> >> +      a remote processor.
> >> +
> >>   config TI_K3_R5_REMOTEPROC
> >>      tristate "TI K3 R5 remoteproc support"
> >>      depends on ARCH_K3
> >> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
> >> index 91314a9b43cef..5ff4e2fee4abd 100644
> >> --- a/drivers/remoteproc/Makefile
> >> +++ b/drivers/remoteproc/Makefile
> >> @@ -37,5 +37,6 @@ obj-$(CONFIG_ST_REMOTEPROC)                += st_remoteproc.o
> >>   obj-$(CONFIG_ST_SLIM_REMOTEPROC)   += st_slim_rproc.o
> >>   obj-$(CONFIG_STM32_RPROC)          += stm32_rproc.o
> >>   obj-$(CONFIG_TI_K3_DSP_REMOTEPROC) += ti_k3_dsp_remoteproc.o
> >> +obj-$(CONFIG_TI_K3_M4_REMOTEPROC)   += ti_k3_m4_remoteproc.o
> >>   obj-$(CONFIG_TI_K3_R5_REMOTEPROC)  += ti_k3_r5_remoteproc.o
> >>   obj-$(CONFIG_XLNX_R5_REMOTEPROC)   += xlnx_r5_remoteproc.o
> >> diff --git a/drivers/remoteproc/ti_k3_m4_remoteproc.c b/drivers/remoteproc/ti_k3_m4_remoteproc.c
> >> new file mode 100644
> >> index 0000000000000..0030e509f6b5d
> >> --- /dev/null
> >> +++ b/drivers/remoteproc/ti_k3_m4_remoteproc.c
> >> @@ -0,0 +1,785 @@
> >> +// SPDX-License-Identifier: GPL-2.0-only
> >> +/*
> >> + * TI K3 Cortex-M4 Remote Processor(s) driver
> >> + *
> >> + * Copyright (C) 2021-2024 Texas Instruments Incorporated - https://www.ti.com/
> >> + *  Hari Nagalla <hnagalla@ti.com>
> >> + */
> >> +
> >> +#include <linux/io.h>
> >> +#include <linux/mailbox_client.h>
> >> +#include <linux/module.h>
> >> +#include <linux/of_address.h>
> >> +#include <linux/of_reserved_mem.h>
> >> +#include <linux/platform_device.h>
> >> +#include <linux/remoteproc.h>
> >> +#include <linux/reset.h>
> >> +#include <linux/slab.h>
> >> +
> >> +#include "omap_remoteproc.h"
> >> +#include "remoteproc_internal.h"
> >> +#include "ti_sci_proc.h"
> >> +
> >> +/**
> >> + * struct k3_m4_rproc_mem - internal memory structure
> >> + * @cpu_addr: MPU virtual address of the memory region
> >> + * @bus_addr: Bus address used to access the memory region
> >> + * @dev_addr: Device address of the memory region from remote processor view
> >> + * @size: Size of the memory region
> >> + */
> >> +struct k3_m4_rproc_mem {
> >> +    void __iomem *cpu_addr;
> >> +    phys_addr_t bus_addr;
> >> +    u32 dev_addr;
> >> +    size_t size;
> >> +};
> >> +
> >> +/**
> >> + * struct k3_m4_rproc_mem_data - memory definitions for a remote processor
> >> + * @name: name for this memory entry
> >> + * @dev_addr: device address for the memory entry
> >> + */
> >> +struct k3_m4_rproc_mem_data {
> >> +    const char *name;
> >> +    const u32 dev_addr;
> >> +};
> >> +
> >> +/**
> >> + * struct k3_m4_rproc_dev_data - device data structure for a remote processor
> >> + * @mems: pointer to memory definitions for a remote processor
> >> + * @num_mems: number of memory regions in @mems
> >> + * @uses_lreset: flag to denote the need for local reset management
> >> + */
> >> +struct k3_m4_rproc_dev_data {
> >> +    const struct k3_m4_rproc_mem_data *mems;
> >> +    u32 num_mems;
> >> +    bool uses_lreset;
> >> +};
> >> +
> >> +/**
> >> + * struct k3_m4_rproc - k3 remote processor driver structure
> >> + * @dev: cached device pointer
> >> + * @rproc: remoteproc device handle
> >> + * @mem: internal memory regions data
> >> + * @num_mems: number of internal memory regions
> >> + * @rmem: reserved memory regions data
> >> + * @num_rmems: number of reserved memory regions
> >> + * @reset: reset control handle
> >> + * @data: pointer to device data
> >> + * @tsp: TI-SCI processor control handle
> >> + * @ti_sci: TI-SCI handle
> >> + * @ti_sci_id: TI-SCI device identifier
> >> + * @mbox: mailbox channel handle
> >> + * @client: mailbox client to request the mailbox channel
> >> + */
> >> +struct k3_m4_rproc {
> >> +    struct device *dev;
> >> +    struct rproc *rproc;
> >> +    struct k3_m4_rproc_mem *mem;
> >> +    int num_mems;
> >> +    struct k3_m4_rproc_mem *rmem;
> >> +    int num_rmems;
> >> +    struct reset_control *reset;
> >> +    const struct k3_m4_rproc_dev_data *data;
> >> +    struct ti_sci_proc *tsp;
> >> +    const struct ti_sci_handle *ti_sci;
> >> +    u32 ti_sci_id;
> >> +    struct mbox_chan *mbox;
> >> +    struct mbox_client client;
> >> +};
> >> +
> >> +/**
> >> + * k3_m4_rproc_mbox_callback() - inbound mailbox message handler
> >> + * @client: mailbox client pointer used for requesting the mailbox channel
> >> + * @data: mailbox payload
> >> + *
> >> + * This handler is invoked by the K3 mailbox driver whenever a mailbox
> >> + * message is received. Usually, the mailbox payload simply contains
> >> + * the index of the virtqueue that is kicked by the remote processor,
> >> + * and we let remoteproc core handle it.
> >> + *
> >> + * In addition to virtqueue indices, we also have some out-of-band values
> >> + * that indicate different events. Those values are deliberately very
> >> + * large so they don't coincide with virtqueue indices.
> >> + */
> >> +static void k3_m4_rproc_mbox_callback(struct mbox_client *client, void *data)
> >> +{
> >> +    struct k3_m4_rproc *kproc = container_of(client, struct k3_m4_rproc,
> >> +                                              client);
> >> +    struct device *dev = kproc->rproc->dev.parent;
> >> +    const char *name = kproc->rproc->name;
> >> +    u32 msg = (u32)(uintptr_t)(data);
> >> +
> >> +    dev_dbg(dev, "mbox msg: 0x%x\n", msg);
> >> +
> >> +    switch (msg) {
> >> +    case RP_MBOX_CRASH:
> >> +            /*
> >> +             * remoteproc detected an exception, but error recovery is not
> >> +             * supported. So, just log this for now
> >> +             */
> >> +            dev_err(dev, "K3 rproc %s crashed\n", name);
> >> +            break;
> >> +    case RP_MBOX_ECHO_REPLY:
> >> +            dev_info(dev, "received echo reply from %s\n", name);
> >> +            break;
> >> +    default:
> >> +            /* silently handle all other valid messages */
> >> +            if (msg >= RP_MBOX_READY && msg < RP_MBOX_END_MSG)
> >> +                    return;
> >> +            if (msg > kproc->rproc->max_notifyid) {
> >> +                    dev_dbg(dev, "dropping unknown message 0x%x", msg);
> >> +                    return;
> >> +            }
> >> +            /* msg contains the index of the triggered vring */
> >> +            if (rproc_vq_interrupt(kproc->rproc, msg) == IRQ_NONE)
> >> +                    dev_dbg(dev, "no message was found in vqid %d\n", msg);
> >> +    }
> >> +}
> >> +
> >> +/*
> >> + * Kick the remote processor to notify about pending unprocessed messages.
> >> + * The vqid usage is not used and is inconsequential, as the kick is performed
> >> + * through a simulated GPIO (a bit in an IPC interrupt-triggering register),
> >> + * the remote processor is expected to process both its Tx and Rx virtqueues.
> >> + */
> >> +static void k3_m4_rproc_kick(struct rproc *rproc, int vqid)
> >> +{
> >> +    struct k3_m4_rproc *kproc = rproc->priv;
> >> +    struct device *dev = rproc->dev.parent;
> >> +    u32 msg = (u32)vqid;
> >> +    int ret;
> >> +
> >> +    /* send the index of the triggered virtqueue in the mailbox payload */
> >> +    ret = mbox_send_message(kproc->mbox, (void *)(uintptr_t)msg);
> >> +    if (ret < 0)
> >> +            dev_err(dev, "failed to send mailbox message, status = %d\n",
> >> +                    ret);
> >> +}
> >> +
> >> +/* Put the remote processor into reset */
> >> +static int k3_m4_rproc_reset(struct k3_m4_rproc *kproc)
> >> +{
> >> +    struct device *dev = kproc->dev;
> >> +    int ret;
> >> +
> >> +    ret = reset_control_assert(kproc->reset);
> >> +    if (ret) {
> >> +            dev_err(dev, "local-reset assert failed, ret = %d\n", ret);
> >> +            return ret;
> >> +    }
> >> +
> >> +    if (kproc->data->uses_lreset)
> >> +            return ret;
> >> +
> >> +    ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
> >> +                                                kproc->ti_sci_id);
> >> +    if (ret) {
> >> +            dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
> >> +            if (reset_control_deassert(kproc->reset))
> >> +                    dev_warn(dev, "local-reset deassert back failed\n");
> >> +    }
> >> +
> >> +    return ret;
> >> +}
> >> +
> >> +/* Release the remote processor from reset */
> >> +static int k3_m4_rproc_release(struct k3_m4_rproc *kproc)
> >> +{
> >> +    struct device *dev = kproc->dev;
> >> +    int ret;
> >> +
> >> +    if (kproc->data->uses_lreset)
> >> +            goto lreset;
> >> +
> >> +    ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
> >> +                                                kproc->ti_sci_id);
> >> +    if (ret) {
> >> +            dev_err(dev, "module-reset deassert failed, ret = %d\n", ret);
> >> +            return ret;
> >> +    }
> >> +
> >> +lreset:
> >> +    ret = reset_control_deassert(kproc->reset);
> >> +    if (ret) {
> >> +            dev_err(dev, "local-reset deassert failed, ret = %d\n", ret);
> >> +            if (kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
> >> +                                                      kproc->ti_sci_id))
> >> +                    dev_warn(dev, "module-reset assert back failed\n");
> >> +    }
> >> +
> >> +    return ret;
> >> +}
> >> +
> >> +static int k3_m4_rproc_request_mbox(struct rproc *rproc)
> >> +{
> >> +    struct k3_m4_rproc *kproc = rproc->priv;
> >> +    struct mbox_client *client = &kproc->client;
> >> +    struct device *dev = kproc->dev;
> >> +    int ret;
> >> +
> >> +    client->dev = dev;
> >> +    client->tx_done = NULL;
> >> +    client->rx_callback = k3_m4_rproc_mbox_callback;
> >> +    client->tx_block = false;
> >> +    client->knows_txdone = false;
> >> +
> >> +    kproc->mbox = mbox_request_channel(client, 0);
> >> +    if (IS_ERR(kproc->mbox)) {
> >> +            ret = -EBUSY;
> >> +            dev_err(dev, "mbox_request_channel failed: %ld\n",
> >> +                    PTR_ERR(kproc->mbox));
> >> +            return ret;
> >> +    }
> >> +
> >> +    /*
> >> +     * Ping the remote processor, this is only for sanity-sake for now;
> >> +     * there is no functional effect whatsoever.
> >> +     *
> >> +     * Note that the reply will _not_ arrive immediately: this message
> >> +     * will wait in the mailbox fifo until the remote processor is booted.
> >> +     */
> >> +    ret = mbox_send_message(kproc->mbox, (void *)RP_MBOX_ECHO_REQUEST);
> >> +    if (ret < 0) {
> >> +            dev_err(dev, "mbox_send_message failed: %d\n", ret);
> >> +            mbox_free_channel(kproc->mbox);
> >> +            return ret;
> >> +    }
> >> +
> >> +    return 0;
> >> +}
> >> +
> >> +/*
> >> + * The M4 cores have a local reset that affects only the CPU, and a
> >> + * generic module reset that powers on the device and allows the internal
> >> + * memories to be accessed while the local reset is asserted. This function is
> >> + * used to release the global reset on remote cores to allow loading into the
> >> + * internal RAMs. The .prepare() ops is invoked by remoteproc core before any
> >> + * firmware loading, and is followed by the .start() ops after loading to
> >> + * actually let the remote cores to run. This callback is invoked only in
> >> + * remoteproc mode.
> >> + */
> >> +static int k3_m4_rproc_prepare(struct rproc *rproc)
> >> +{
> >> +    struct k3_m4_rproc *kproc = rproc->priv;
> >> +    struct device *dev = kproc->dev;
> >> +    int ret;
> >> +
> >> +    ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
> >> +                                                kproc->ti_sci_id);
> >> +    if (ret)
> >> +            dev_err(dev, "module-reset deassert failed, cannot enable internal RAM loading, ret = %d\n",
> >> +                    ret);
> >> +
> >> +    return ret;
> >> +}
> >> +
> >> +/*
> >> + * This function implements the .unprepare() ops and performs the complimentary
> >> + * operations to that of the .prepare() ops. The function is used to assert the
> >> + * global reset on applicable cores. This completes the second portion of
> >> + * powering down the remote core. The cores themselves are only halted in the
> >> + * .stop() callback through the local reset, and the .unprepare() ops is invoked
> >> + * by the remoteproc core after the remoteproc is stopped to balance the global
> >> + * reset. This callback is invoked only in remoteproc mode.
> >> + */
> >> +static int k3_m4_rproc_unprepare(struct rproc *rproc)
> >> +{
> >> +    struct k3_m4_rproc *kproc = rproc->priv;
> >> +    struct device *dev = kproc->dev;
> >> +    int ret;
> >> +
> >> +    ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
> >> +                                                kproc->ti_sci_id);
> >> +    if (ret)
> >> +            dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
> >> +
> >> +    return ret;
> >> +}
> >> +
> >> +/*
> >> + * This function implements the .get_loaded_rsc_table() callback and is used
> >> + * to provide the resource table for a booted remote processor in IPC-only
> >> + * mode. The remote processor firmwares follow a design-by-contract approach
> >> + * and are expected to have the resource table at the base of the DDR region
> >> + * reserved for firmware usage. This provides flexibility for the remote
> >> + * processor to be booted by different bootloaders that may or may not have the
> >> + * ability to publish the resource table address and size through a DT
> >> + * property.
> >> + */
> >> +static struct resource_table *k3_m4_get_loaded_rsc_table(struct rproc *rproc,
> >> +                                                     size_t *rsc_table_sz)
> >> +{
> >> +    struct k3_m4_rproc *kproc = rproc->priv;
> >> +    struct device *dev = kproc->dev;
> >> +
> >> +    if (!kproc->rmem[0].cpu_addr) {
> >> +            dev_err(dev, "memory-region #1 does not exist, loaded rsc table can't be found");
> >> +            return ERR_PTR(-ENOMEM);
> >> +    }
> >> +
> >> +    /*
> >> +     * NOTE: The resource table size is currently hard-coded to a maximum
> >> +     * of 256 bytes. The most common resource table usage for K3 firmwares
> >> +     * is to only have the vdev resource entry and an optional trace entry.
> >> +     * The exact size could be computed based on resource table address, but
> >> +     * the hard-coded value suffices to support the IPC-only mode.
> >> +     */
> >> +    *rsc_table_sz = 256;
> >> +    return (__force struct resource_table *)kproc->rmem[0].cpu_addr;
> >> +}
> >> +
> >> +/*
> >> + * Custom function to translate a remote processor device address (internal
> >> + * RAMs only) to a kernel virtual address.  The remote processors can access
> >> + * their RAMs at either an internal address visible only from a remote
> >> + * processor, or at the SoC-level bus address. Both these addresses need to be
> >> + * looked through for translation. The translated addresses can be used either
> >> + * by the remoteproc core for loading (when using kernel remoteproc loader), or
> >> + * by any rpmsg bus drivers.
> >> + */
> >> +static void *k3_m4_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
> >> +{
> >> +    struct k3_m4_rproc *kproc = rproc->priv;
> >> +    void __iomem *va = NULL;
> >> +    phys_addr_t bus_addr;
> >> +    u32 dev_addr, offset;
> >> +    size_t size;
> >> +    int i;
> >> +
> >> +    if (len == 0)
> >> +            return NULL;
> >> +
> >> +    for (i = 0; i < kproc->num_mems; i++) {
> >> +            bus_addr = kproc->mem[i].bus_addr;
> >> +            dev_addr = kproc->mem[i].dev_addr;
> >> +            size = kproc->mem[i].size;
> >> +
> >> +            /* handle M4-view addresses */
> >> +            if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
> >> +                    offset = da - dev_addr;
> >> +                    va = kproc->mem[i].cpu_addr + offset;
> >> +                    return (__force void *)va;
> >> +            }
> >> +
> >> +            /* handle SoC-view addresses */
> >> +            if (da >= bus_addr && ((da + len) <= (bus_addr + size))) {
> >> +                    offset = da - bus_addr;
> >> +                    va = kproc->mem[i].cpu_addr + offset;
> >> +                    return (__force void *)va;
> >> +            }
> >> +    }
> >> +
> >> +    /* handle static DDR reserved memory regions */
> >> +    for (i = 0; i < kproc->num_rmems; i++) {
> >> +            dev_addr = kproc->rmem[i].dev_addr;
> >> +            size = kproc->rmem[i].size;
> >> +
> >> +            if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
> >> +                    offset = da - dev_addr;
> >> +                    va = kproc->rmem[i].cpu_addr + offset;
> >> +                    return (__force void *)va;
> >> +            }
> >> +    }
> >> +
> >> +    return NULL;
> >> +}
> >> +
> >> +static int k3_m4_rproc_of_get_memories(struct platform_device *pdev,
> >> +                                   struct k3_m4_rproc *kproc)
> >> +{
> >> +    const struct k3_m4_rproc_dev_data *data = kproc->data;
> >> +    struct device *dev = &pdev->dev;
> >> +    struct resource *res;
> >> +    int num_mems = 0;
> >> +    int i;
> >> +
> >> +    num_mems = kproc->data->num_mems;
> >> +    kproc->mem = devm_kcalloc(kproc->dev, num_mems,
> >> +                              sizeof(*kproc->mem), GFP_KERNEL);
> >> +    if (!kproc->mem)
> >> +            return -ENOMEM;
> >> +
> >> +    for (i = 0; i < num_mems; i++) {
> >> +            res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> >> +                                               data->mems[i].name);
> >> +            if (!res) {
> >> +                    dev_err(dev, "found no memory resource for %s\n",
> >> +                            data->mems[i].name);
> >> +                    return -EINVAL;
> >> +            }
> >> +            if (!devm_request_mem_region(dev, res->start,
> >> +                                         resource_size(res),
> >> +                                         dev_name(dev))) {
> >> +                    dev_err(dev, "could not request %s region for resource\n",
> >> +                            data->mems[i].name);
> >> +                    return -EBUSY;
> >> +            }
> >> +
> >> +            kproc->mem[i].cpu_addr = devm_ioremap_wc(dev, res->start,
> >> +                                                     resource_size(res));
> >> +            if (!kproc->mem[i].cpu_addr) {
> >> +                    dev_err(dev, "failed to map %s memory\n",
> >> +                            data->mems[i].name);
> >> +                    return -ENOMEM;
> >> +            }
> >> +            kproc->mem[i].bus_addr = res->start;
> >> +            kproc->mem[i].dev_addr = data->mems[i].dev_addr;
> >> +            kproc->mem[i].size = resource_size(res);
> >> +
> >> +            dev_dbg(dev, "memory %8s: bus addr %pa size 0x%zx va %pK da 0x%x\n",
> >> +                    data->mems[i].name, &kproc->mem[i].bus_addr,
> >> +                    kproc->mem[i].size, kproc->mem[i].cpu_addr,
> >> +                    kproc->mem[i].dev_addr);
> >> +    }
> >> +    kproc->num_mems = num_mems;
> >> +
> >> +    return 0;
> >> +}
> >> +
> >> +static void k3_m4_rproc_dev_mem_release(void *data)
> >> +{
> >> +    struct device *dev = data;
> >> +
> >> +    of_reserved_mem_device_release(dev);
> >> +}
> >> +
> >> +static int k3_m4_reserved_mem_init(struct k3_m4_rproc *kproc)
> >> +{
> >> +    struct device *dev = kproc->dev;
> >> +    struct device_node *np = dev->of_node;
> >> +    struct device_node *rmem_np;
> >> +    struct reserved_mem *rmem;
> >> +    int num_rmems;
> >> +    int ret, i;
> >> +
> >> +    num_rmems = of_property_count_elems_of_size(np, "memory-region",
> >> +                                                sizeof(phandle));
> >> +    if (num_rmems < 0) {
> >> +            dev_err(dev, "device does not reserved memory regions (%pe)\n",
> >> +                    ERR_PTR(num_rmems));
> >> +            return -EINVAL;
> >> +    }
> >> +    if (num_rmems < 2) {
> >> +            dev_err(dev, "device needs at least two memory regions to be defined, num = %d\n",
> >> +                    num_rmems);
> >> +            return -EINVAL;
> >> +    }
> >> +
> >> +    /* use reserved memory region 0 for vring DMA allocations */
> >> +    ret = of_reserved_mem_device_init_by_idx(dev, np, 0);
> >> +    if (ret) {
> >> +            dev_err(dev, "device cannot initialize DMA pool (%pe)\n",
> >> +                    ERR_PTR(ret));
> >> +            return ret;
> >> +    }
> >> +    ret = devm_add_action_or_reset(dev, k3_m4_rproc_dev_mem_release, dev);
> >> +    if (ret)
> >> +            return ret;
> >> +
> >> +    num_rmems--;
> >> +    kproc->rmem = devm_kcalloc(dev, num_rmems, sizeof(*kproc->rmem), GFP_KERNEL);
> >> +    if (!kproc->rmem)
> >> +            return -ENOMEM;
> >> +
> >> +    /* use remaining reserved memory regions for static carveouts */
> >> +    for (i = 0; i < num_rmems; i++) {
> >> +            rmem_np = of_parse_phandle(np, "memory-region", i + 1);
> >> +            if (!rmem_np)
> >> +                    return -EINVAL;
> >> +
> >> +            rmem = of_reserved_mem_lookup(rmem_np);
> >> +            if (!rmem) {
> >> +                    of_node_put(rmem_np);
> >> +                    return -EINVAL;
> >> +            }
> >> +            of_node_put(rmem_np);
> >> +
> >> +            kproc->rmem[i].bus_addr = rmem->base;
> >> +            /* 64-bit address regions currently not supported */
> >> +            kproc->rmem[i].dev_addr = (u32)rmem->base;
> >> +            kproc->rmem[i].size = rmem->size;
> >> +            kproc->rmem[i].cpu_addr = devm_ioremap_wc(dev, rmem->base, rmem->size);
> >> +            if (!kproc->rmem[i].cpu_addr) {
> >> +                    dev_err(dev, "failed to map reserved memory#%d at %pa of size %pa\n",
> >> +                            i + 1, &rmem->base, &rmem->size);
> >> +                    return -ENOMEM;
> >> +            }
> >> +
> >> +            dev_dbg(dev, "reserved memory%d: bus addr %pa size 0x%zx va %pK da 0x%x\n",
> >> +                    i + 1, &kproc->rmem[i].bus_addr,
> >> +                    kproc->rmem[i].size, kproc->rmem[i].cpu_addr,
> >> +                    kproc->rmem[i].dev_addr);
> >> +    }
> >> +    kproc->num_rmems = num_rmems;
> >> +
> >> +    return 0;
> >> +}
> >> +
> >> +static struct ti_sci_proc *k3_m4_rproc_of_get_tsp(struct device *dev,
> >> +                                              const struct ti_sci_handle *sci)
> >> +{
> >> +    struct ti_sci_proc *tsp;
> >> +    u32 temp[2];
> >> +    int ret;
> >> +
> >> +    ret = of_property_read_u32_array(dev->of_node, "ti,sci-proc-ids",
> >> +                                     temp, 2);
> >> +    if (ret < 0)
> >> +            return ERR_PTR(ret);
> >> +
> >> +    tsp = devm_kzalloc(dev, sizeof(*tsp), GFP_KERNEL);
> >> +    if (!tsp)
> >> +            return ERR_PTR(-ENOMEM);
> >> +
> >> +    tsp->dev = dev;
> >> +    tsp->sci = sci;
> >> +    tsp->ops = &sci->ops.proc_ops;
> >> +    tsp->proc_id = temp[0];
> >> +    tsp->host_id = temp[1];
> >> +
> >> +    return tsp;
> >> +}
> >> +
> >> +static void k3_m4_release_tsp(void *data)
> >> +{
> >> +    struct ti_sci_proc *tsp = data;
> >> +
> >> +    ti_sci_proc_release(tsp);
> >> +}
> >> +
> >> +/*
> >> + * Power up the M4F remote processor.
> >> + *
> >> + * This function will be invoked only after the firmware for this rproc
> >> + * was loaded, parsed successfully, and all of its resource requirements
> >> + * were met. This callback is invoked only in remoteproc mode.
> >> + */
> >> +static int k3_m4_rproc_start(struct rproc *rproc)
> >> +{
> >> +    struct k3_m4_rproc *kproc = rproc->priv;
> >> +    int ret;
> >> +
> >> +    ret = k3_m4_rproc_request_mbox(rproc);
> >> +    if (ret)
> >> +            return ret;
> >> +
> >> +    ret = k3_m4_rproc_release(kproc);
> >> +    if (ret)
> >> +            goto put_mbox;
> >> +
> >> +    return 0;
> >> +
> >> +put_mbox:
> >> +    mbox_free_channel(kproc->mbox);
> >> +    return ret;
> >> +}
> >> +
> >> +/*
> >> + * Stop the M4 remote processor.
> >> + *
> >> + * This function puts the M4 processor into reset, and finishes processing
> >> + * of any pending messages. This callback is invoked only in remoteproc mode.
> >> + */
> >> +static int k3_m4_rproc_stop(struct rproc *rproc)
> >> +{
> >> +    struct k3_m4_rproc *kproc = rproc->priv;
> >> +
> >> +    mbox_free_channel(kproc->mbox);
> >> +
> >> +    k3_m4_rproc_reset(kproc);
> >> +
> >> +    return 0;
> >> +}
> >> +
> >> +/*
> >> + * Attach to a running M4 remote processor (IPC-only mode)
> >> + *
> >> + * This rproc attach callback only needs to request the mailbox, the remote
> >> + * processor is already booted, so there is no need to issue any TI-SCI
> >> + * commands to boot the M4 core. This callback is used only in IPC-only mode.
> >> + */
> >> +static int k3_m4_rproc_attach(struct rproc *rproc)
> >> +{
> >> +    struct k3_m4_rproc *kproc = rproc->priv;
> >> +    struct device *dev = kproc->dev;
> >> +    int ret;
> >> +
> >> +    ret = k3_m4_rproc_request_mbox(rproc);
> >> +    if (ret)
> >> +            return ret;
> >> +
> >> +    dev_info(dev, "M4 initialized in IPC-only mode\n");
> >> +    return 0;
> >> +}
> >> +
> >> +/*
> >> + * Detach from a running M4 remote processor (IPC-only mode)
> >> + *
> >> + * This rproc detach callback performs the opposite operation to attach callback
> >> + * and only needs to release the mailbox, the M4 core is not stopped and will
> >> + * be left to continue to run its booted firmware. This callback is invoked only in
> >> + * IPC-only mode.
> >> + */
> >> +static int k3_m4_rproc_detach(struct rproc *rproc)
> >> +{
> >> +    struct k3_m4_rproc *kproc = rproc->priv;
> >> +    struct device *dev = kproc->dev;
> >> +
> >> +    mbox_free_channel(kproc->mbox);
> >> +    dev_info(dev, "M4 deinitialized in IPC-only mode\n");
> >> +    return 0;
> >> +}
> >> +
> >> +static const struct rproc_ops k3_m4_rproc_ops = {
> >> +    .start          = k3_m4_rproc_start,
> >> +    .stop           = k3_m4_rproc_stop,
> >> +    .attach         = k3_m4_rproc_attach,
> >> +    .detach         = k3_m4_rproc_detach,
> >> +    .kick           = k3_m4_rproc_kick,
> >> +    .da_to_va       = k3_m4_rproc_da_to_va,
> >> +    .get_loaded_rsc_table = k3_m4_get_loaded_rsc_table,
> >> +};
> >> +
> >> +static int k3_m4_rproc_probe(struct platform_device *pdev)
> >> +{
> >> +    struct device *dev = &pdev->dev;
> >> +    struct device_node *np = dev->of_node;
> >> +    const struct k3_m4_rproc_dev_data *data;
> >> +    struct k3_m4_rproc *kproc;
> >> +    struct rproc *rproc;
> >> +    const char *fw_name;
> >> +    bool r_state = false;
> >> +    bool p_state = false;
> >> +    int ret = 0;
> >> +
> >> +    data = device_get_match_data(dev);
> >> +    if (!data)
> >> +            return -ENODEV;
> >> +
> >> +    ret = rproc_of_parse_firmware(dev, 0, &fw_name);
> >> +    if (ret)
> >> +            return dev_err_probe(dev, ret, "failed to parse firmware-name property\n");
> >> +
> >> +    rproc = devm_rproc_alloc(dev, dev_name(dev), &k3_m4_rproc_ops, fw_name,
> >> +                             sizeof(*kproc));
> >> +    if (!rproc)
> >> +            return -ENOMEM;
> >> +
> >> +    rproc->has_iommu = false;
> >> +    rproc->recovery_disabled = true;
> >> +    if (data->uses_lreset) {
> >> +            rproc->ops->prepare = k3_m4_rproc_prepare;
> >> +            rproc->ops->unprepare = k3_m4_rproc_unprepare;
> >> +    }
> >> +    kproc = rproc->priv;
> >> +    kproc->rproc = rproc;
> >> +    kproc->dev = dev;
> >> +    kproc->data = data;
> >> +
> >> +    kproc->ti_sci = devm_ti_sci_get_by_phandle(dev, "ti,sci");
> >> +    if (IS_ERR(kproc->ti_sci))
> >> +            return dev_err_probe(dev, PTR_ERR(kproc->ti_sci),
> >> +                                 "failed to get ti-sci handle\n");
> >> +
> >> +    ret = of_property_read_u32(np, "ti,sci-dev-id", &kproc->ti_sci_id);
> >> +    if (ret)
> >> +            return dev_err_probe(dev, ret, "missing 'ti,sci-dev-id' property\n");
> >> +
> >> +    kproc->reset = devm_reset_control_get_exclusive(dev, NULL);
> >> +    if (IS_ERR(kproc->reset))
> >> +            return dev_err_probe(dev, PTR_ERR(kproc->reset), "failed to get reset\n");
> >
> > What happens when devm_reset_control_get_exclusive() returns NULL?
> >
>
> Only the _optional_ version of this fuction can return NULL, this fuction
> will always return an error if the reset cannot be taken.
>

What does optional mean?  Regardless, it's only a matter of time
before some automated tool starts complaining.

> >> +
> >> +    kproc->tsp = k3_m4_rproc_of_get_tsp(dev, kproc->ti_sci);
> >> +    if (IS_ERR(kproc->tsp))
> >> +            return dev_err_probe(dev, PTR_ERR(kproc->tsp),
> >> +                                 "failed to construct ti-sci proc control\n");
> >> +
> >> +    ret = ti_sci_proc_request(kproc->tsp);
> >> +    if (ret < 0)
> >> +            return dev_err_probe(dev, ret, "ti_sci_proc_request failed\n");
> >> +    ret = devm_add_action_or_reset(dev, k3_m4_release_tsp, kproc->tsp);
> >> +    if (ret)
> >> +            return ret;
> >> +
> >> +    ret = k3_m4_rproc_of_get_memories(pdev, kproc);
> >> +    if (ret)
> >> +            return ret;
> >> +
> >> +    ret = k3_m4_reserved_mem_init(kproc);
> >> +    if (ret)
> >> +            return dev_err_probe(dev, ret, "reserved memory init failed\n");
> >> +
> >> +    ret = kproc->ti_sci->ops.dev_ops.is_on(kproc->ti_sci, kproc->ti_sci_id,
> >> +                                           &r_state, &p_state);
> >> +    if (ret)
> >> +            return dev_err_probe(dev, ret,
> >> +                                 "failed to get initial state, mode cannot be determined\n");
> >> +
> >> +    /* configure devices for either remoteproc or IPC-only mode */
> >> +    if (p_state) {
> >> +            dev_info(dev, "configured M4 for IPC-only mode\n");
> >> +            rproc->state = RPROC_DETACHED;
> >> +            /* override rproc ops with only required IPC-only mode ops */
> >> +            rproc->ops->prepare = NULL;
> >> +            rproc->ops->unprepare = NULL;
> >> +            rproc->ops->start = NULL;
> >> +            rproc->ops->stop = NULL;
> >> +            rproc->ops->attach = k3_m4_rproc_attach;
> >> +            rproc->ops->detach = k3_m4_rproc_detach;
> >> +            rproc->ops->get_loaded_rsc_table = k3_m4_get_loaded_rsc_table;
> >
> > Why are the last 3 assignment needed when they are already set in the
> > declaration of k3_m4_rproc_ops?
> >
>
> Good point, seems none of these overrides should be needed, start()/stop()
> are not called for ATTCHED/DETACHED cores anyway, opposite is true for attach()/detach().
>
> I'll drop these overrides.
>
> >> +    } else {
> >> +            dev_info(dev, "configured M4 for remoteproc mode\n");
> >> +            /*
> >> +             * ensure the M4 local reset is asserted to ensure the core
> >> +             * doesn't execute bogus code in .prepare() when the module
> >> +             * reset is released.
> >> +             */
> >> +            if (data->uses_lreset) {
> >> +                    ret = reset_control_status(kproc->reset);
> >> +                    if (ret < 0) {
> >> +                            return dev_err_probe(dev, ret, "failed to get reset status\n");
> >> +                    } else if (ret == 0) {
> >> +                            dev_warn(dev, "local reset is deasserted for device\n");
> >> +                            k3_m4_rproc_reset(kproc);
> >> +                    }
> >> +            }
> >> +    }
> >> +
> >> +    ret = devm_rproc_add(dev, rproc);
> >> +    if (ret)
> >> +            return dev_err_probe(dev, ret,
> >> +                                 "failed to add register device with remoteproc core\n");
> >> +
> >> +    return 0;
> >> +}
> >> +
> >> +static const struct k3_m4_rproc_mem_data am64_m4_mems[] = {
> >> +    { .name = "iram", .dev_addr = 0x0 },
> >> +    { .name = "dram", .dev_addr = 0x30000 },
> >> +};
> >
> > Is this hardcoded in the hardware and never expected to change?  If not please
> > add to the DT bindings.
> >
>
> This is a hardware hardcoded address and will be the same for this class
> of K3 M4 cores.
>
> Thanks,
> Andrew
>
> > More comments later or tomorrow.
> >
> > Thanks,
> > Mathieu
> >
> >> +
> >> +static const struct k3_m4_rproc_dev_data am64_m4_data = {
> >> +    .mems = am64_m4_mems,
> >> +    .num_mems = ARRAY_SIZE(am64_m4_mems),
> >> +    .uses_lreset = true,
> >> +};
> >> +
> >> +static const struct of_device_id k3_m4_of_match[] = {
> >> +    { .compatible = "ti,am64-m4fss", .data = &am64_m4_data, },
> >> +    { /* sentinel */ },
> >> +};
> >> +MODULE_DEVICE_TABLE(of, k3_m4_of_match);
> >> +
> >> +static struct platform_driver k3_m4_rproc_driver = {
> >> +    .probe  = k3_m4_rproc_probe,
> >> +    .driver = {
> >> +            .name = "k3-m4-rproc",
> >> +            .of_match_table = k3_m4_of_match,
> >> +    },
> >> +};
> >> +module_platform_driver(k3_m4_rproc_driver);
> >> +
> >> +MODULE_AUTHOR("Hari Nagalla <hnagalla@ti.com>");
> >> +MODULE_DESCRIPTION("TI K3 M4 Remoteproc driver");
> >> +MODULE_LICENSE("GPL");
> >> --
> >> 2.39.2
> >>

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Re: [PATCH v9 2/5] remoteproc: k3-m4: Add a remoteproc driver for M4F subsystem

[Andrew Davis]

On 5/9/24 10:22 AM, Mathieu Poirier wrote:
> On Wed, 8 May 2024 at 09:36, Andrew Davis <afd@ti.com> wrote:
>>
>> On 5/6/24 3:46 PM, Mathieu Poirier wrote:
>>> Good day,
>>>
>>> I have started reviewing this patchset.  Comments will be scattered over
>>> multiple days and as such, I will explicitly inform you when  am done with the
>>> review.
>>>
>>> On Fri, Apr 26, 2024 at 02:18:08PM -0500, Andrew Davis wrote:
>>>> From: Martyn Welch <martyn.welch@collabora.com>
>>>>
>>>> The AM62x and AM64x SoCs of the TI K3 family has a Cortex M4F core in
>>>> the MCU domain. This core is typically used for safety applications in a
>>>> stand alone mode. However, some application (non safety related) may
>>>> want to use the M4F core as a generic remote processor with IPC to the
>>>> host processor. The M4F core has internal IRAM and DRAM memories and are
>>>> exposed to the system bus for code and data loading.
>>>>
>>>> A remote processor driver is added to support this subsystem, including
>>>> being able to load and boot the M4F core. Loading includes to M4F
>>>> internal memories and predefined external code/data memories. The
>>>> carve outs for external contiguous memory is defined in the M4F device
>>>> node and should match with the external memory declarations in the M4F
>>>> image binary. The M4F subsystem has two resets. One reset is for the
>>>> entire subsystem i.e including the internal memories and the other, a
>>>> local reset is only for the M4F processing core. When loading the image,
>>>> the driver first releases the subsystem reset, loads the firmware image
>>>> and then releases the local reset to let the M4F processing core run.
>>>>
>>>> Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
>>>> Signed-off-by: Hari Nagalla <hnagalla@ti.com>
>>>> Signed-off-by: Andrew Davis <afd@ti.com>
>>>> ---
>>>>    drivers/remoteproc/Kconfig               |  13 +
>>>>    drivers/remoteproc/Makefile              |   1 +
>>>>    drivers/remoteproc/ti_k3_m4_remoteproc.c | 785 +++++++++++++++++++++++
>>>>    3 files changed, 799 insertions(+)
>>>>    create mode 100644 drivers/remoteproc/ti_k3_m4_remoteproc.c
>>>>
>>>> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
>>>> index 48845dc8fa852..1a7c0330c91a9 100644
>>>> --- a/drivers/remoteproc/Kconfig
>>>> +++ b/drivers/remoteproc/Kconfig
>>>> @@ -339,6 +339,19 @@ config TI_K3_DSP_REMOTEPROC
>>>>         It's safe to say N here if you're not interested in utilizing
>>>>         the DSP slave processors.
>>>>
>>>> +config TI_K3_M4_REMOTEPROC
>>>> +    tristate "TI K3 M4 remoteproc support"
>>>> +    depends on ARCH_K3 || COMPILE_TEST
>>>> +    select MAILBOX
>>>> +    select OMAP2PLUS_MBOX
>>>> +    help
>>>> +      Say m here to support TI's M4 remote processor subsystems
>>>> +      on various TI K3 family of SoCs through the remote processor
>>>> +      framework.
>>>> +
>>>> +      It's safe to say N here if you're not interested in utilizing
>>>> +      a remote processor.
>>>> +
>>>>    config TI_K3_R5_REMOTEPROC
>>>>       tristate "TI K3 R5 remoteproc support"
>>>>       depends on ARCH_K3
>>>> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
>>>> index 91314a9b43cef..5ff4e2fee4abd 100644
>>>> --- a/drivers/remoteproc/Makefile
>>>> +++ b/drivers/remoteproc/Makefile
>>>> @@ -37,5 +37,6 @@ obj-$(CONFIG_ST_REMOTEPROC)                += st_remoteproc.o
>>>>    obj-$(CONFIG_ST_SLIM_REMOTEPROC)   += st_slim_rproc.o
>>>>    obj-$(CONFIG_STM32_RPROC)          += stm32_rproc.o
>>>>    obj-$(CONFIG_TI_K3_DSP_REMOTEPROC) += ti_k3_dsp_remoteproc.o
>>>> +obj-$(CONFIG_TI_K3_M4_REMOTEPROC)   += ti_k3_m4_remoteproc.o
>>>>    obj-$(CONFIG_TI_K3_R5_REMOTEPROC)  += ti_k3_r5_remoteproc.o
>>>>    obj-$(CONFIG_XLNX_R5_REMOTEPROC)   += xlnx_r5_remoteproc.o
>>>> diff --git a/drivers/remoteproc/ti_k3_m4_remoteproc.c b/drivers/remoteproc/ti_k3_m4_remoteproc.c
>>>> new file mode 100644
>>>> index 0000000000000..0030e509f6b5d
>>>> --- /dev/null
>>>> +++ b/drivers/remoteproc/ti_k3_m4_remoteproc.c
>>>> @@ -0,0 +1,785 @@
>>>> +// SPDX-License-Identifier: GPL-2.0-only
>>>> +/*
>>>> + * TI K3 Cortex-M4 Remote Processor(s) driver
>>>> + *
>>>> + * Copyright (C) 2021-2024 Texas Instruments Incorporated - https://www.ti.com/
>>>> + *  Hari Nagalla <hnagalla@ti.com>
>>>> + */
>>>> +
>>>> +#include <linux/io.h>
>>>> +#include <linux/mailbox_client.h>
>>>> +#include <linux/module.h>
>>>> +#include <linux/of_address.h>
>>>> +#include <linux/of_reserved_mem.h>
>>>> +#include <linux/platform_device.h>
>>>> +#include <linux/remoteproc.h>
>>>> +#include <linux/reset.h>
>>>> +#include <linux/slab.h>
>>>> +
>>>> +#include "omap_remoteproc.h"
>>>> +#include "remoteproc_internal.h"
>>>> +#include "ti_sci_proc.h"
>>>> +
>>>> +/**
>>>> + * struct k3_m4_rproc_mem - internal memory structure
>>>> + * @cpu_addr: MPU virtual address of the memory region
>>>> + * @bus_addr: Bus address used to access the memory region
>>>> + * @dev_addr: Device address of the memory region from remote processor view
>>>> + * @size: Size of the memory region
>>>> + */
>>>> +struct k3_m4_rproc_mem {
>>>> +    void __iomem *cpu_addr;
>>>> +    phys_addr_t bus_addr;
>>>> +    u32 dev_addr;
>>>> +    size_t size;
>>>> +};
>>>> +
>>>> +/**
>>>> + * struct k3_m4_rproc_mem_data - memory definitions for a remote processor
>>>> + * @name: name for this memory entry
>>>> + * @dev_addr: device address for the memory entry
>>>> + */
>>>> +struct k3_m4_rproc_mem_data {
>>>> +    const char *name;
>>>> +    const u32 dev_addr;
>>>> +};
>>>> +
>>>> +/**
>>>> + * struct k3_m4_rproc_dev_data - device data structure for a remote processor
>>>> + * @mems: pointer to memory definitions for a remote processor
>>>> + * @num_mems: number of memory regions in @mems
>>>> + * @uses_lreset: flag to denote the need for local reset management
>>>> + */
>>>> +struct k3_m4_rproc_dev_data {
>>>> +    const struct k3_m4_rproc_mem_data *mems;
>>>> +    u32 num_mems;
>>>> +    bool uses_lreset;
>>>> +};
>>>> +
>>>> +/**
>>>> + * struct k3_m4_rproc - k3 remote processor driver structure
>>>> + * @dev: cached device pointer
>>>> + * @rproc: remoteproc device handle
>>>> + * @mem: internal memory regions data
>>>> + * @num_mems: number of internal memory regions
>>>> + * @rmem: reserved memory regions data
>>>> + * @num_rmems: number of reserved memory regions
>>>> + * @reset: reset control handle
>>>> + * @data: pointer to device data
>>>> + * @tsp: TI-SCI processor control handle
>>>> + * @ti_sci: TI-SCI handle
>>>> + * @ti_sci_id: TI-SCI device identifier
>>>> + * @mbox: mailbox channel handle
>>>> + * @client: mailbox client to request the mailbox channel
>>>> + */
>>>> +struct k3_m4_rproc {
>>>> +    struct device *dev;
>>>> +    struct rproc *rproc;
>>>> +    struct k3_m4_rproc_mem *mem;
>>>> +    int num_mems;
>>>> +    struct k3_m4_rproc_mem *rmem;
>>>> +    int num_rmems;
>>>> +    struct reset_control *reset;
>>>> +    const struct k3_m4_rproc_dev_data *data;
>>>> +    struct ti_sci_proc *tsp;
>>>> +    const struct ti_sci_handle *ti_sci;
>>>> +    u32 ti_sci_id;
>>>> +    struct mbox_chan *mbox;
>>>> +    struct mbox_client client;
>>>> +};
>>>> +
>>>> +/**
>>>> + * k3_m4_rproc_mbox_callback() - inbound mailbox message handler
>>>> + * @client: mailbox client pointer used for requesting the mailbox channel
>>>> + * @data: mailbox payload
>>>> + *
>>>> + * This handler is invoked by the K3 mailbox driver whenever a mailbox
>>>> + * message is received. Usually, the mailbox payload simply contains
>>>> + * the index of the virtqueue that is kicked by the remote processor,
>>>> + * and we let remoteproc core handle it.
>>>> + *
>>>> + * In addition to virtqueue indices, we also have some out-of-band values
>>>> + * that indicate different events. Those values are deliberately very
>>>> + * large so they don't coincide with virtqueue indices.
>>>> + */
>>>> +static void k3_m4_rproc_mbox_callback(struct mbox_client *client, void *data)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = container_of(client, struct k3_m4_rproc,
>>>> +                                              client);
>>>> +    struct device *dev = kproc->rproc->dev.parent;
>>>> +    const char *name = kproc->rproc->name;
>>>> +    u32 msg = (u32)(uintptr_t)(data);
>>>> +
>>>> +    dev_dbg(dev, "mbox msg: 0x%x\n", msg);
>>>> +
>>>> +    switch (msg) {
>>>> +    case RP_MBOX_CRASH:
>>>> +            /*
>>>> +             * remoteproc detected an exception, but error recovery is not
>>>> +             * supported. So, just log this for now
>>>> +             */
>>>> +            dev_err(dev, "K3 rproc %s crashed\n", name);
>>>> +            break;
>>>> +    case RP_MBOX_ECHO_REPLY:
>>>> +            dev_info(dev, "received echo reply from %s\n", name);
>>>> +            break;
>>>> +    default:
>>>> +            /* silently handle all other valid messages */
>>>> +            if (msg >= RP_MBOX_READY && msg < RP_MBOX_END_MSG)
>>>> +                    return;
>>>> +            if (msg > kproc->rproc->max_notifyid) {
>>>> +                    dev_dbg(dev, "dropping unknown message 0x%x", msg);
>>>> +                    return;
>>>> +            }
>>>> +            /* msg contains the index of the triggered vring */
>>>> +            if (rproc_vq_interrupt(kproc->rproc, msg) == IRQ_NONE)
>>>> +                    dev_dbg(dev, "no message was found in vqid %d\n", msg);
>>>> +    }
>>>> +}
>>>> +
>>>> +/*
>>>> + * Kick the remote processor to notify about pending unprocessed messages.
>>>> + * The vqid usage is not used and is inconsequential, as the kick is performed
>>>> + * through a simulated GPIO (a bit in an IPC interrupt-triggering register),
>>>> + * the remote processor is expected to process both its Tx and Rx virtqueues.
>>>> + */
>>>> +static void k3_m4_rproc_kick(struct rproc *rproc, int vqid)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = rproc->priv;
>>>> +    struct device *dev = rproc->dev.parent;
>>>> +    u32 msg = (u32)vqid;
>>>> +    int ret;
>>>> +
>>>> +    /* send the index of the triggered virtqueue in the mailbox payload */
>>>> +    ret = mbox_send_message(kproc->mbox, (void *)(uintptr_t)msg);
>>>> +    if (ret < 0)
>>>> +            dev_err(dev, "failed to send mailbox message, status = %d\n",
>>>> +                    ret);
>>>> +}
>>>> +
>>>> +/* Put the remote processor into reset */
>>>> +static int k3_m4_rproc_reset(struct k3_m4_rproc *kproc)
>>>> +{
>>>> +    struct device *dev = kproc->dev;
>>>> +    int ret;
>>>> +
>>>> +    ret = reset_control_assert(kproc->reset);
>>>> +    if (ret) {
>>>> +            dev_err(dev, "local-reset assert failed, ret = %d\n", ret);
>>>> +            return ret;
>>>> +    }
>>>> +
>>>> +    if (kproc->data->uses_lreset)
>>>> +            return ret;
>>>> +
>>>> +    ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
>>>> +                                                kproc->ti_sci_id);
>>>> +    if (ret) {
>>>> +            dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
>>>> +            if (reset_control_deassert(kproc->reset))
>>>> +                    dev_warn(dev, "local-reset deassert back failed\n");
>>>> +    }
>>>> +
>>>> +    return ret;
>>>> +}
>>>> +
>>>> +/* Release the remote processor from reset */
>>>> +static int k3_m4_rproc_release(struct k3_m4_rproc *kproc)
>>>> +{
>>>> +    struct device *dev = kproc->dev;
>>>> +    int ret;
>>>> +
>>>> +    if (kproc->data->uses_lreset)
>>>> +            goto lreset;
>>>> +
>>>> +    ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
>>>> +                                                kproc->ti_sci_id);
>>>> +    if (ret) {
>>>> +            dev_err(dev, "module-reset deassert failed, ret = %d\n", ret);
>>>> +            return ret;
>>>> +    }
>>>> +
>>>> +lreset:
>>>> +    ret = reset_control_deassert(kproc->reset);
>>>> +    if (ret) {
>>>> +            dev_err(dev, "local-reset deassert failed, ret = %d\n", ret);
>>>> +            if (kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
>>>> +                                                      kproc->ti_sci_id))
>>>> +                    dev_warn(dev, "module-reset assert back failed\n");
>>>> +    }
>>>> +
>>>> +    return ret;
>>>> +}
>>>> +
>>>> +static int k3_m4_rproc_request_mbox(struct rproc *rproc)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = rproc->priv;
>>>> +    struct mbox_client *client = &kproc->client;
>>>> +    struct device *dev = kproc->dev;
>>>> +    int ret;
>>>> +
>>>> +    client->dev = dev;
>>>> +    client->tx_done = NULL;
>>>> +    client->rx_callback = k3_m4_rproc_mbox_callback;
>>>> +    client->tx_block = false;
>>>> +    client->knows_txdone = false;
>>>> +
>>>> +    kproc->mbox = mbox_request_channel(client, 0);
>>>> +    if (IS_ERR(kproc->mbox)) {
>>>> +            ret = -EBUSY;
>>>> +            dev_err(dev, "mbox_request_channel failed: %ld\n",
>>>> +                    PTR_ERR(kproc->mbox));
>>>> +            return ret;
>>>> +    }
>>>> +
>>>> +    /*
>>>> +     * Ping the remote processor, this is only for sanity-sake for now;
>>>> +     * there is no functional effect whatsoever.
>>>> +     *
>>>> +     * Note that the reply will _not_ arrive immediately: this message
>>>> +     * will wait in the mailbox fifo until the remote processor is booted.
>>>> +     */
>>>> +    ret = mbox_send_message(kproc->mbox, (void *)RP_MBOX_ECHO_REQUEST);
>>>> +    if (ret < 0) {
>>>> +            dev_err(dev, "mbox_send_message failed: %d\n", ret);
>>>> +            mbox_free_channel(kproc->mbox);
>>>> +            return ret;
>>>> +    }
>>>> +
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +/*
>>>> + * The M4 cores have a local reset that affects only the CPU, and a
>>>> + * generic module reset that powers on the device and allows the internal
>>>> + * memories to be accessed while the local reset is asserted. This function is
>>>> + * used to release the global reset on remote cores to allow loading into the
>>>> + * internal RAMs. The .prepare() ops is invoked by remoteproc core before any
>>>> + * firmware loading, and is followed by the .start() ops after loading to
>>>> + * actually let the remote cores to run. This callback is invoked only in
>>>> + * remoteproc mode.
>>>> + */
>>>> +static int k3_m4_rproc_prepare(struct rproc *rproc)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = rproc->priv;
>>>> +    struct device *dev = kproc->dev;
>>>> +    int ret;
>>>> +
>>>> +    ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
>>>> +                                                kproc->ti_sci_id);
>>>> +    if (ret)
>>>> +            dev_err(dev, "module-reset deassert failed, cannot enable internal RAM loading, ret = %d\n",
>>>> +                    ret);
>>>> +
>>>> +    return ret;
>>>> +}
>>>> +
>>>> +/*
>>>> + * This function implements the .unprepare() ops and performs the complimentary
>>>> + * operations to that of the .prepare() ops. The function is used to assert the
>>>> + * global reset on applicable cores. This completes the second portion of
>>>> + * powering down the remote core. The cores themselves are only halted in the
>>>> + * .stop() callback through the local reset, and the .unprepare() ops is invoked
>>>> + * by the remoteproc core after the remoteproc is stopped to balance the global
>>>> + * reset. This callback is invoked only in remoteproc mode.
>>>> + */
>>>> +static int k3_m4_rproc_unprepare(struct rproc *rproc)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = rproc->priv;
>>>> +    struct device *dev = kproc->dev;
>>>> +    int ret;
>>>> +
>>>> +    ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
>>>> +                                                kproc->ti_sci_id);
>>>> +    if (ret)
>>>> +            dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
>>>> +
>>>> +    return ret;
>>>> +}
>>>> +
>>>> +/*
>>>> + * This function implements the .get_loaded_rsc_table() callback and is used
>>>> + * to provide the resource table for a booted remote processor in IPC-only
>>>> + * mode. The remote processor firmwares follow a design-by-contract approach
>>>> + * and are expected to have the resource table at the base of the DDR region
>>>> + * reserved for firmware usage. This provides flexibility for the remote
>>>> + * processor to be booted by different bootloaders that may or may not have the
>>>> + * ability to publish the resource table address and size through a DT
>>>> + * property.
>>>> + */
>>>> +static struct resource_table *k3_m4_get_loaded_rsc_table(struct rproc *rproc,
>>>> +                                                     size_t *rsc_table_sz)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = rproc->priv;
>>>> +    struct device *dev = kproc->dev;
>>>> +
>>>> +    if (!kproc->rmem[0].cpu_addr) {
>>>> +            dev_err(dev, "memory-region #1 does not exist, loaded rsc table can't be found");
>>>> +            return ERR_PTR(-ENOMEM);
>>>> +    }
>>>> +
>>>> +    /*
>>>> +     * NOTE: The resource table size is currently hard-coded to a maximum
>>>> +     * of 256 bytes. The most common resource table usage for K3 firmwares
>>>> +     * is to only have the vdev resource entry and an optional trace entry.
>>>> +     * The exact size could be computed based on resource table address, but
>>>> +     * the hard-coded value suffices to support the IPC-only mode.
>>>> +     */
>>>> +    *rsc_table_sz = 256;
>>>> +    return (__force struct resource_table *)kproc->rmem[0].cpu_addr;
>>>> +}
>>>> +
>>>> +/*
>>>> + * Custom function to translate a remote processor device address (internal
>>>> + * RAMs only) to a kernel virtual address.  The remote processors can access
>>>> + * their RAMs at either an internal address visible only from a remote
>>>> + * processor, or at the SoC-level bus address. Both these addresses need to be
>>>> + * looked through for translation. The translated addresses can be used either
>>>> + * by the remoteproc core for loading (when using kernel remoteproc loader), or
>>>> + * by any rpmsg bus drivers.
>>>> + */
>>>> +static void *k3_m4_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = rproc->priv;
>>>> +    void __iomem *va = NULL;
>>>> +    phys_addr_t bus_addr;
>>>> +    u32 dev_addr, offset;
>>>> +    size_t size;
>>>> +    int i;
>>>> +
>>>> +    if (len == 0)
>>>> +            return NULL;
>>>> +
>>>> +    for (i = 0; i < kproc->num_mems; i++) {
>>>> +            bus_addr = kproc->mem[i].bus_addr;
>>>> +            dev_addr = kproc->mem[i].dev_addr;
>>>> +            size = kproc->mem[i].size;
>>>> +
>>>> +            /* handle M4-view addresses */
>>>> +            if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
>>>> +                    offset = da - dev_addr;
>>>> +                    va = kproc->mem[i].cpu_addr + offset;
>>>> +                    return (__force void *)va;
>>>> +            }
>>>> +
>>>> +            /* handle SoC-view addresses */
>>>> +            if (da >= bus_addr && ((da + len) <= (bus_addr + size))) {
>>>> +                    offset = da - bus_addr;
>>>> +                    va = kproc->mem[i].cpu_addr + offset;
>>>> +                    return (__force void *)va;
>>>> +            }
>>>> +    }
>>>> +
>>>> +    /* handle static DDR reserved memory regions */
>>>> +    for (i = 0; i < kproc->num_rmems; i++) {
>>>> +            dev_addr = kproc->rmem[i].dev_addr;
>>>> +            size = kproc->rmem[i].size;
>>>> +
>>>> +            if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
>>>> +                    offset = da - dev_addr;
>>>> +                    va = kproc->rmem[i].cpu_addr + offset;
>>>> +                    return (__force void *)va;
>>>> +            }
>>>> +    }
>>>> +
>>>> +    return NULL;
>>>> +}
>>>> +
>>>> +static int k3_m4_rproc_of_get_memories(struct platform_device *pdev,
>>>> +                                   struct k3_m4_rproc *kproc)
>>>> +{
>>>> +    const struct k3_m4_rproc_dev_data *data = kproc->data;
>>>> +    struct device *dev = &pdev->dev;
>>>> +    struct resource *res;
>>>> +    int num_mems = 0;
>>>> +    int i;
>>>> +
>>>> +    num_mems = kproc->data->num_mems;
>>>> +    kproc->mem = devm_kcalloc(kproc->dev, num_mems,
>>>> +                              sizeof(*kproc->mem), GFP_KERNEL);
>>>> +    if (!kproc->mem)
>>>> +            return -ENOMEM;
>>>> +
>>>> +    for (i = 0; i < num_mems; i++) {
>>>> +            res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
>>>> +                                               data->mems[i].name);
>>>> +            if (!res) {
>>>> +                    dev_err(dev, "found no memory resource for %s\n",
>>>> +                            data->mems[i].name);
>>>> +                    return -EINVAL;
>>>> +            }
>>>> +            if (!devm_request_mem_region(dev, res->start,
>>>> +                                         resource_size(res),
>>>> +                                         dev_name(dev))) {
>>>> +                    dev_err(dev, "could not request %s region for resource\n",
>>>> +                            data->mems[i].name);
>>>> +                    return -EBUSY;
>>>> +            }
>>>> +
>>>> +            kproc->mem[i].cpu_addr = devm_ioremap_wc(dev, res->start,
>>>> +                                                     resource_size(res));
>>>> +            if (!kproc->mem[i].cpu_addr) {
>>>> +                    dev_err(dev, "failed to map %s memory\n",
>>>> +                            data->mems[i].name);
>>>> +                    return -ENOMEM;
>>>> +            }
>>>> +            kproc->mem[i].bus_addr = res->start;
>>>> +            kproc->mem[i].dev_addr = data->mems[i].dev_addr;
>>>> +            kproc->mem[i].size = resource_size(res);
>>>> +
>>>> +            dev_dbg(dev, "memory %8s: bus addr %pa size 0x%zx va %pK da 0x%x\n",
>>>> +                    data->mems[i].name, &kproc->mem[i].bus_addr,
>>>> +                    kproc->mem[i].size, kproc->mem[i].cpu_addr,
>>>> +                    kproc->mem[i].dev_addr);
>>>> +    }
>>>> +    kproc->num_mems = num_mems;
>>>> +
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +static void k3_m4_rproc_dev_mem_release(void *data)
>>>> +{
>>>> +    struct device *dev = data;
>>>> +
>>>> +    of_reserved_mem_device_release(dev);
>>>> +}
>>>> +
>>>> +static int k3_m4_reserved_mem_init(struct k3_m4_rproc *kproc)
>>>> +{
>>>> +    struct device *dev = kproc->dev;
>>>> +    struct device_node *np = dev->of_node;
>>>> +    struct device_node *rmem_np;
>>>> +    struct reserved_mem *rmem;
>>>> +    int num_rmems;
>>>> +    int ret, i;
>>>> +
>>>> +    num_rmems = of_property_count_elems_of_size(np, "memory-region",
>>>> +                                                sizeof(phandle));
>>>> +    if (num_rmems < 0) {
>>>> +            dev_err(dev, "device does not reserved memory regions (%pe)\n",
>>>> +                    ERR_PTR(num_rmems));
>>>> +            return -EINVAL;
>>>> +    }
>>>> +    if (num_rmems < 2) {
>>>> +            dev_err(dev, "device needs at least two memory regions to be defined, num = %d\n",
>>>> +                    num_rmems);
>>>> +            return -EINVAL;
>>>> +    }
>>>> +
>>>> +    /* use reserved memory region 0 for vring DMA allocations */
>>>> +    ret = of_reserved_mem_device_init_by_idx(dev, np, 0);
>>>> +    if (ret) {
>>>> +            dev_err(dev, "device cannot initialize DMA pool (%pe)\n",
>>>> +                    ERR_PTR(ret));
>>>> +            return ret;
>>>> +    }
>>>> +    ret = devm_add_action_or_reset(dev, k3_m4_rproc_dev_mem_release, dev);
>>>> +    if (ret)
>>>> +            return ret;
>>>> +
>>>> +    num_rmems--;
>>>> +    kproc->rmem = devm_kcalloc(dev, num_rmems, sizeof(*kproc->rmem), GFP_KERNEL);
>>>> +    if (!kproc->rmem)
>>>> +            return -ENOMEM;
>>>> +
>>>> +    /* use remaining reserved memory regions for static carveouts */
>>>> +    for (i = 0; i < num_rmems; i++) {
>>>> +            rmem_np = of_parse_phandle(np, "memory-region", i + 1);
>>>> +            if (!rmem_np)
>>>> +                    return -EINVAL;
>>>> +
>>>> +            rmem = of_reserved_mem_lookup(rmem_np);
>>>> +            if (!rmem) {
>>>> +                    of_node_put(rmem_np);
>>>> +                    return -EINVAL;
>>>> +            }
>>>> +            of_node_put(rmem_np);
>>>> +
>>>> +            kproc->rmem[i].bus_addr = rmem->base;
>>>> +            /* 64-bit address regions currently not supported */
>>>> +            kproc->rmem[i].dev_addr = (u32)rmem->base;
>>>> +            kproc->rmem[i].size = rmem->size;
>>>> +            kproc->rmem[i].cpu_addr = devm_ioremap_wc(dev, rmem->base, rmem->size);
>>>> +            if (!kproc->rmem[i].cpu_addr) {
>>>> +                    dev_err(dev, "failed to map reserved memory#%d at %pa of size %pa\n",
>>>> +                            i + 1, &rmem->base, &rmem->size);
>>>> +                    return -ENOMEM;
>>>> +            }
>>>> +
>>>> +            dev_dbg(dev, "reserved memory%d: bus addr %pa size 0x%zx va %pK da 0x%x\n",
>>>> +                    i + 1, &kproc->rmem[i].bus_addr,
>>>> +                    kproc->rmem[i].size, kproc->rmem[i].cpu_addr,
>>>> +                    kproc->rmem[i].dev_addr);
>>>> +    }
>>>> +    kproc->num_rmems = num_rmems;
>>>> +
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +static struct ti_sci_proc *k3_m4_rproc_of_get_tsp(struct device *dev,
>>>> +                                              const struct ti_sci_handle *sci)
>>>> +{
>>>> +    struct ti_sci_proc *tsp;
>>>> +    u32 temp[2];
>>>> +    int ret;
>>>> +
>>>> +    ret = of_property_read_u32_array(dev->of_node, "ti,sci-proc-ids",
>>>> +                                     temp, 2);
>>>> +    if (ret < 0)
>>>> +            return ERR_PTR(ret);
>>>> +
>>>> +    tsp = devm_kzalloc(dev, sizeof(*tsp), GFP_KERNEL);
>>>> +    if (!tsp)
>>>> +            return ERR_PTR(-ENOMEM);
>>>> +
>>>> +    tsp->dev = dev;
>>>> +    tsp->sci = sci;
>>>> +    tsp->ops = &sci->ops.proc_ops;
>>>> +    tsp->proc_id = temp[0];
>>>> +    tsp->host_id = temp[1];
>>>> +
>>>> +    return tsp;
>>>> +}
>>>> +
>>>> +static void k3_m4_release_tsp(void *data)
>>>> +{
>>>> +    struct ti_sci_proc *tsp = data;
>>>> +
>>>> +    ti_sci_proc_release(tsp);
>>>> +}
>>>> +
>>>> +/*
>>>> + * Power up the M4F remote processor.
>>>> + *
>>>> + * This function will be invoked only after the firmware for this rproc
>>>> + * was loaded, parsed successfully, and all of its resource requirements
>>>> + * were met. This callback is invoked only in remoteproc mode.
>>>> + */
>>>> +static int k3_m4_rproc_start(struct rproc *rproc)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = rproc->priv;
>>>> +    int ret;
>>>> +
>>>> +    ret = k3_m4_rproc_request_mbox(rproc);
>>>> +    if (ret)
>>>> +            return ret;
>>>> +
>>>> +    ret = k3_m4_rproc_release(kproc);
>>>> +    if (ret)
>>>> +            goto put_mbox;
>>>> +
>>>> +    return 0;
>>>> +
>>>> +put_mbox:
>>>> +    mbox_free_channel(kproc->mbox);
>>>> +    return ret;
>>>> +}
>>>> +
>>>> +/*
>>>> + * Stop the M4 remote processor.
>>>> + *
>>>> + * This function puts the M4 processor into reset, and finishes processing
>>>> + * of any pending messages. This callback is invoked only in remoteproc mode.
>>>> + */
>>>> +static int k3_m4_rproc_stop(struct rproc *rproc)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = rproc->priv;
>>>> +
>>>> +    mbox_free_channel(kproc->mbox);
>>>> +
>>>> +    k3_m4_rproc_reset(kproc);
>>>> +
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +/*
>>>> + * Attach to a running M4 remote processor (IPC-only mode)
>>>> + *
>>>> + * This rproc attach callback only needs to request the mailbox, the remote
>>>> + * processor is already booted, so there is no need to issue any TI-SCI
>>>> + * commands to boot the M4 core. This callback is used only in IPC-only mode.
>>>> + */
>>>> +static int k3_m4_rproc_attach(struct rproc *rproc)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = rproc->priv;
>>>> +    struct device *dev = kproc->dev;
>>>> +    int ret;
>>>> +
>>>> +    ret = k3_m4_rproc_request_mbox(rproc);
>>>> +    if (ret)
>>>> +            return ret;
>>>> +
>>>> +    dev_info(dev, "M4 initialized in IPC-only mode\n");
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +/*
>>>> + * Detach from a running M4 remote processor (IPC-only mode)
>>>> + *
>>>> + * This rproc detach callback performs the opposite operation to attach callback
>>>> + * and only needs to release the mailbox, the M4 core is not stopped and will
>>>> + * be left to continue to run its booted firmware. This callback is invoked only in
>>>> + * IPC-only mode.
>>>> + */
>>>> +static int k3_m4_rproc_detach(struct rproc *rproc)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = rproc->priv;
>>>> +    struct device *dev = kproc->dev;
>>>> +
>>>> +    mbox_free_channel(kproc->mbox);
>>>> +    dev_info(dev, "M4 deinitialized in IPC-only mode\n");
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +static const struct rproc_ops k3_m4_rproc_ops = {
>>>> +    .start          = k3_m4_rproc_start,
>>>> +    .stop           = k3_m4_rproc_stop,
>>>> +    .attach         = k3_m4_rproc_attach,
>>>> +    .detach         = k3_m4_rproc_detach,
>>>> +    .kick           = k3_m4_rproc_kick,
>>>> +    .da_to_va       = k3_m4_rproc_da_to_va,
>>>> +    .get_loaded_rsc_table = k3_m4_get_loaded_rsc_table,
>>>> +};
>>>> +
>>>> +static int k3_m4_rproc_probe(struct platform_device *pdev)
>>>> +{
>>>> +    struct device *dev = &pdev->dev;
>>>> +    struct device_node *np = dev->of_node;
>>>> +    const struct k3_m4_rproc_dev_data *data;
>>>> +    struct k3_m4_rproc *kproc;
>>>> +    struct rproc *rproc;
>>>> +    const char *fw_name;
>>>> +    bool r_state = false;
>>>> +    bool p_state = false;
>>>> +    int ret = 0;
>>>> +
>>>> +    data = device_get_match_data(dev);
>>>> +    if (!data)
>>>> +            return -ENODEV;
>>>> +
>>>> +    ret = rproc_of_parse_firmware(dev, 0, &fw_name);
>>>> +    if (ret)
>>>> +            return dev_err_probe(dev, ret, "failed to parse firmware-name property\n");
>>>> +
>>>> +    rproc = devm_rproc_alloc(dev, dev_name(dev), &k3_m4_rproc_ops, fw_name,
>>>> +                             sizeof(*kproc));
>>>> +    if (!rproc)
>>>> +            return -ENOMEM;
>>>> +
>>>> +    rproc->has_iommu = false;
>>>> +    rproc->recovery_disabled = true;
>>>> +    if (data->uses_lreset) {
>>>> +            rproc->ops->prepare = k3_m4_rproc_prepare;
>>>> +            rproc->ops->unprepare = k3_m4_rproc_unprepare;
>>>> +    }
>>>> +    kproc = rproc->priv;
>>>> +    kproc->rproc = rproc;
>>>> +    kproc->dev = dev;
>>>> +    kproc->data = data;
>>>> +
>>>> +    kproc->ti_sci = devm_ti_sci_get_by_phandle(dev, "ti,sci");
>>>> +    if (IS_ERR(kproc->ti_sci))
>>>> +            return dev_err_probe(dev, PTR_ERR(kproc->ti_sci),
>>>> +                                 "failed to get ti-sci handle\n");
>>>> +
>>>> +    ret = of_property_read_u32(np, "ti,sci-dev-id", &kproc->ti_sci_id);
>>>> +    if (ret)
>>>> +            return dev_err_probe(dev, ret, "missing 'ti,sci-dev-id' property\n");
>>>> +
>>>> +    kproc->reset = devm_reset_control_get_exclusive(dev, NULL);
>>>> +    if (IS_ERR(kproc->reset))
>>>> +            return dev_err_probe(dev, PTR_ERR(kproc->reset), "failed to get reset\n");
>>>
>>> What happens when devm_reset_control_get_exclusive() returns NULL?
>>>
>>
>> Only the _optional_ version of this fuction can return NULL, this fuction
>> will always return an error if the reset cannot be taken.
>>
> 
> What does optional mean?  Regardless, it's only a matter of time
> before some automated tool starts complaining.
> 

The "optional" versions of these reset_get functions (like reset_control_get_optional)
will return NULL if the reset cannot be found. All the other reset_control_*() functions
are built to take NULL as an argument without issue. That way if `kproc->reset`
was set to NULL there is no failure (other than the reset wouldn't work, but as said,
since this is not the optional version of this function, not finding the reset
would return an error, never NULL).

And, as NULL is a valid value for kproc->reset to have, no automated tool should ever
complain (and if it did, the tool would need fixed as NULL is valid here).

>>>> +
>>>> +    kproc->tsp = k3_m4_rproc_of_get_tsp(dev, kproc->ti_sci);
>>>> +    if (IS_ERR(kproc->tsp))
>>>> +            return dev_err_probe(dev, PTR_ERR(kproc->tsp),
>>>> +                                 "failed to construct ti-sci proc control\n");
>>>> +
>>>> +    ret = ti_sci_proc_request(kproc->tsp);
>>>> +    if (ret < 0)
>>>> +            return dev_err_probe(dev, ret, "ti_sci_proc_request failed\n");
>>>> +    ret = devm_add_action_or_reset(dev, k3_m4_release_tsp, kproc->tsp);
>>>> +    if (ret)
>>>> +            return ret;
>>>> +
>>>> +    ret = k3_m4_rproc_of_get_memories(pdev, kproc);
>>>> +    if (ret)
>>>> +            return ret;
>>>> +
>>>> +    ret = k3_m4_reserved_mem_init(kproc);
>>>> +    if (ret)
>>>> +            return dev_err_probe(dev, ret, "reserved memory init failed\n");
>>>> +
>>>> +    ret = kproc->ti_sci->ops.dev_ops.is_on(kproc->ti_sci, kproc->ti_sci_id,
>>>> +                                           &r_state, &p_state);
>>>> +    if (ret)
>>>> +            return dev_err_probe(dev, ret,
>>>> +                                 "failed to get initial state, mode cannot be determined\n");
>>>> +
>>>> +    /* configure devices for either remoteproc or IPC-only mode */
>>>> +    if (p_state) {
>>>> +            dev_info(dev, "configured M4 for IPC-only mode\n");
>>>> +            rproc->state = RPROC_DETACHED;
>>>> +            /* override rproc ops with only required IPC-only mode ops */
>>>> +            rproc->ops->prepare = NULL;
>>>> +            rproc->ops->unprepare = NULL;
>>>> +            rproc->ops->start = NULL;
>>>> +            rproc->ops->stop = NULL;
>>>> +            rproc->ops->attach = k3_m4_rproc_attach;
>>>> +            rproc->ops->detach = k3_m4_rproc_detach;
>>>> +            rproc->ops->get_loaded_rsc_table = k3_m4_get_loaded_rsc_table;
>>>
>>> Why are the last 3 assignment needed when they are already set in the
>>> declaration of k3_m4_rproc_ops?
>>>
>>
>> Good point, seems none of these overrides should be needed, start()/stop()
>> are not called for ATTCHED/DETACHED cores anyway, opposite is true for attach()/detach().
>>
>> I'll drop these overrides.
>>
>>>> +    } else {
>>>> +            dev_info(dev, "configured M4 for remoteproc mode\n");
>>>> +            /*
>>>> +             * ensure the M4 local reset is asserted to ensure the core
>>>> +             * doesn't execute bogus code in .prepare() when the module
>>>> +             * reset is released.
>>>> +             */
>>>> +            if (data->uses_lreset) {
>>>> +                    ret = reset_control_status(kproc->reset);
>>>> +                    if (ret < 0) {
>>>> +                            return dev_err_probe(dev, ret, "failed to get reset status\n");
>>>> +                    } else if (ret == 0) {
>>>> +                            dev_warn(dev, "local reset is deasserted for device\n");
>>>> +                            k3_m4_rproc_reset(kproc);
>>>> +                    }
>>>> +            }
>>>> +    }
>>>> +
>>>> +    ret = devm_rproc_add(dev, rproc);
>>>> +    if (ret)
>>>> +            return dev_err_probe(dev, ret,
>>>> +                                 "failed to add register device with remoteproc core\n");
>>>> +
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +static const struct k3_m4_rproc_mem_data am64_m4_mems[] = {
>>>> +    { .name = "iram", .dev_addr = 0x0 },
>>>> +    { .name = "dram", .dev_addr = 0x30000 },
>>>> +};
>>>
>>> Is this hardcoded in the hardware and never expected to change?  If not please
>>> add to the DT bindings.
>>>
>>
>> This is a hardware hardcoded address and will be the same for this class
>> of K3 M4 cores.
>>
>> Thanks,
>> Andrew
>>
>>> More comments later or tomorrow.
>>>
>>> Thanks,
>>> Mathieu
>>>
>>>> +
>>>> +static const struct k3_m4_rproc_dev_data am64_m4_data = {
>>>> +    .mems = am64_m4_mems,
>>>> +    .num_mems = ARRAY_SIZE(am64_m4_mems),
>>>> +    .uses_lreset = true,
>>>> +};
>>>> +
>>>> +static const struct of_device_id k3_m4_of_match[] = {
>>>> +    { .compatible = "ti,am64-m4fss", .data = &am64_m4_data, },
>>>> +    { /* sentinel */ },
>>>> +};
>>>> +MODULE_DEVICE_TABLE(of, k3_m4_of_match);
>>>> +
>>>> +static struct platform_driver k3_m4_rproc_driver = {
>>>> +    .probe  = k3_m4_rproc_probe,
>>>> +    .driver = {
>>>> +            .name = "k3-m4-rproc",
>>>> +            .of_match_table = k3_m4_of_match,
>>>> +    },
>>>> +};
>>>> +module_platform_driver(k3_m4_rproc_driver);
>>>> +
>>>> +MODULE_AUTHOR("Hari Nagalla <hnagalla@ti.com>");
>>>> +MODULE_DESCRIPTION("TI K3 M4 Remoteproc driver");
>>>> +MODULE_LICENSE("GPL");
>>>> --
>>>> 2.39.2
>>>>

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Re: [PATCH v9 2/5] remoteproc: k3-m4: Add a remoteproc driver for M4F subsystem

[Mathieu Poirier]

On Thu, May 09, 2024 at 10:54:51AM -0500, Andrew Davis wrote:
> On 5/9/24 10:22 AM, Mathieu Poirier wrote:
> > On Wed, 8 May 2024 at 09:36, Andrew Davis <afd@ti.com> wrote:
> > > 
> > > On 5/6/24 3:46 PM, Mathieu Poirier wrote:
> > > > Good day,
> > > > 
> > > > I have started reviewing this patchset.  Comments will be scattered over
> > > > multiple days and as such, I will explicitly inform you when  am done with the
> > > > review.
> > > > 
> > > > On Fri, Apr 26, 2024 at 02:18:08PM -0500, Andrew Davis wrote:
> > > > > From: Martyn Welch <martyn.welch@collabora.com>
> > > > > 
> > > > > The AM62x and AM64x SoCs of the TI K3 family has a Cortex M4F core in
> > > > > the MCU domain. This core is typically used for safety applications in a
> > > > > stand alone mode. However, some application (non safety related) may
> > > > > want to use the M4F core as a generic remote processor with IPC to the
> > > > > host processor. The M4F core has internal IRAM and DRAM memories and are
> > > > > exposed to the system bus for code and data loading.
> > > > > 
> > > > > A remote processor driver is added to support this subsystem, including
> > > > > being able to load and boot the M4F core. Loading includes to M4F
> > > > > internal memories and predefined external code/data memories. The
> > > > > carve outs for external contiguous memory is defined in the M4F device
> > > > > node and should match with the external memory declarations in the M4F
> > > > > image binary. The M4F subsystem has two resets. One reset is for the
> > > > > entire subsystem i.e including the internal memories and the other, a
> > > > > local reset is only for the M4F processing core. When loading the image,
> > > > > the driver first releases the subsystem reset, loads the firmware image
> > > > > and then releases the local reset to let the M4F processing core run.
> > > > > 
> > > > > Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
> > > > > Signed-off-by: Hari Nagalla <hnagalla@ti.com>
> > > > > Signed-off-by: Andrew Davis <afd@ti.com>
> > > > > ---
> > > > >    drivers/remoteproc/Kconfig               |  13 +
> > > > >    drivers/remoteproc/Makefile              |   1 +
> > > > >    drivers/remoteproc/ti_k3_m4_remoteproc.c | 785 +++++++++++++++++++++++
> > > > >    3 files changed, 799 insertions(+)
> > > > >    create mode 100644 drivers/remoteproc/ti_k3_m4_remoteproc.c
> > > > > 
> > > > > diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> > > > > index 48845dc8fa852..1a7c0330c91a9 100644
> > > > > --- a/drivers/remoteproc/Kconfig
> > > > > +++ b/drivers/remoteproc/Kconfig
> > > > > @@ -339,6 +339,19 @@ config TI_K3_DSP_REMOTEPROC
> > > > >         It's safe to say N here if you're not interested in utilizing
> > > > >         the DSP slave processors.
> > > > > 
> > > > > +config TI_K3_M4_REMOTEPROC
> > > > > +    tristate "TI K3 M4 remoteproc support"
> > > > > +    depends on ARCH_K3 || COMPILE_TEST
> > > > > +    select MAILBOX
> > > > > +    select OMAP2PLUS_MBOX
> > > > > +    help
> > > > > +      Say m here to support TI's M4 remote processor subsystems
> > > > > +      on various TI K3 family of SoCs through the remote processor
> > > > > +      framework.
> > > > > +
> > > > > +      It's safe to say N here if you're not interested in utilizing
> > > > > +      a remote processor.
> > > > > +
> > > > >    config TI_K3_R5_REMOTEPROC
> > > > >       tristate "TI K3 R5 remoteproc support"
> > > > >       depends on ARCH_K3
> > > > > diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
> > > > > index 91314a9b43cef..5ff4e2fee4abd 100644
> > > > > --- a/drivers/remoteproc/Makefile
> > > > > +++ b/drivers/remoteproc/Makefile
> > > > > @@ -37,5 +37,6 @@ obj-$(CONFIG_ST_REMOTEPROC)                += st_remoteproc.o
> > > > >    obj-$(CONFIG_ST_SLIM_REMOTEPROC)   += st_slim_rproc.o
> > > > >    obj-$(CONFIG_STM32_RPROC)          += stm32_rproc.o
> > > > >    obj-$(CONFIG_TI_K3_DSP_REMOTEPROC) += ti_k3_dsp_remoteproc.o
> > > > > +obj-$(CONFIG_TI_K3_M4_REMOTEPROC)   += ti_k3_m4_remoteproc.o
> > > > >    obj-$(CONFIG_TI_K3_R5_REMOTEPROC)  += ti_k3_r5_remoteproc.o
> > > > >    obj-$(CONFIG_XLNX_R5_REMOTEPROC)   += xlnx_r5_remoteproc.o
> > > > > diff --git a/drivers/remoteproc/ti_k3_m4_remoteproc.c b/drivers/remoteproc/ti_k3_m4_remoteproc.c
> > > > > new file mode 100644
> > > > > index 0000000000000..0030e509f6b5d
> > > > > --- /dev/null
> > > > > +++ b/drivers/remoteproc/ti_k3_m4_remoteproc.c
> > > > > @@ -0,0 +1,785 @@
> > > > > +// SPDX-License-Identifier: GPL-2.0-only
> > > > > +/*
> > > > > + * TI K3 Cortex-M4 Remote Processor(s) driver
> > > > > + *
> > > > > + * Copyright (C) 2021-2024 Texas Instruments Incorporated - https://www.ti.com/
> > > > > + *  Hari Nagalla <hnagalla@ti.com>
> > > > > + */
> > > > > +
> > > > > +#include <linux/io.h>
> > > > > +#include <linux/mailbox_client.h>
> > > > > +#include <linux/module.h>
> > > > > +#include <linux/of_address.h>
> > > > > +#include <linux/of_reserved_mem.h>
> > > > > +#include <linux/platform_device.h>
> > > > > +#include <linux/remoteproc.h>
> > > > > +#include <linux/reset.h>
> > > > > +#include <linux/slab.h>
> > > > > +
> > > > > +#include "omap_remoteproc.h"
> > > > > +#include "remoteproc_internal.h"
> > > > > +#include "ti_sci_proc.h"
> > > > > +
> > > > > +/**
> > > > > + * struct k3_m4_rproc_mem - internal memory structure
> > > > > + * @cpu_addr: MPU virtual address of the memory region
> > > > > + * @bus_addr: Bus address used to access the memory region
> > > > > + * @dev_addr: Device address of the memory region from remote processor view
> > > > > + * @size: Size of the memory region
> > > > > + */
> > > > > +struct k3_m4_rproc_mem {
> > > > > +    void __iomem *cpu_addr;
> > > > > +    phys_addr_t bus_addr;
> > > > > +    u32 dev_addr;
> > > > > +    size_t size;
> > > > > +};
> > > > > +
> > > > > +/**
> > > > > + * struct k3_m4_rproc_mem_data - memory definitions for a remote processor
> > > > > + * @name: name for this memory entry
> > > > > + * @dev_addr: device address for the memory entry
> > > > > + */
> > > > > +struct k3_m4_rproc_mem_data {
> > > > > +    const char *name;
> > > > > +    const u32 dev_addr;
> > > > > +};
> > > > > +
> > > > > +/**
> > > > > + * struct k3_m4_rproc_dev_data - device data structure for a remote processor
> > > > > + * @mems: pointer to memory definitions for a remote processor
> > > > > + * @num_mems: number of memory regions in @mems
> > > > > + * @uses_lreset: flag to denote the need for local reset management
> > > > > + */
> > > > > +struct k3_m4_rproc_dev_data {
> > > > > +    const struct k3_m4_rproc_mem_data *mems;
> > > > > +    u32 num_mems;
> > > > > +    bool uses_lreset;
> > > > > +};
> > > > > +
> > > > > +/**
> > > > > + * struct k3_m4_rproc - k3 remote processor driver structure
> > > > > + * @dev: cached device pointer
> > > > > + * @rproc: remoteproc device handle
> > > > > + * @mem: internal memory regions data
> > > > > + * @num_mems: number of internal memory regions
> > > > > + * @rmem: reserved memory regions data
> > > > > + * @num_rmems: number of reserved memory regions
> > > > > + * @reset: reset control handle
> > > > > + * @data: pointer to device data
> > > > > + * @tsp: TI-SCI processor control handle
> > > > > + * @ti_sci: TI-SCI handle
> > > > > + * @ti_sci_id: TI-SCI device identifier
> > > > > + * @mbox: mailbox channel handle
> > > > > + * @client: mailbox client to request the mailbox channel
> > > > > + */
> > > > > +struct k3_m4_rproc {
> > > > > +    struct device *dev;
> > > > > +    struct rproc *rproc;
> > > > > +    struct k3_m4_rproc_mem *mem;
> > > > > +    int num_mems;
> > > > > +    struct k3_m4_rproc_mem *rmem;
> > > > > +    int num_rmems;
> > > > > +    struct reset_control *reset;
> > > > > +    const struct k3_m4_rproc_dev_data *data;
> > > > > +    struct ti_sci_proc *tsp;
> > > > > +    const struct ti_sci_handle *ti_sci;
> > > > > +    u32 ti_sci_id;
> > > > > +    struct mbox_chan *mbox;
> > > > > +    struct mbox_client client;
> > > > > +};
> > > > > +
> > > > > +/**
> > > > > + * k3_m4_rproc_mbox_callback() - inbound mailbox message handler
> > > > > + * @client: mailbox client pointer used for requesting the mailbox channel
> > > > > + * @data: mailbox payload
> > > > > + *
> > > > > + * This handler is invoked by the K3 mailbox driver whenever a mailbox
> > > > > + * message is received. Usually, the mailbox payload simply contains
> > > > > + * the index of the virtqueue that is kicked by the remote processor,
> > > > > + * and we let remoteproc core handle it.
> > > > > + *
> > > > > + * In addition to virtqueue indices, we also have some out-of-band values
> > > > > + * that indicate different events. Those values are deliberately very
> > > > > + * large so they don't coincide with virtqueue indices.
> > > > > + */
> > > > > +static void k3_m4_rproc_mbox_callback(struct mbox_client *client, void *data)
> > > > > +{
> > > > > +    struct k3_m4_rproc *kproc = container_of(client, struct k3_m4_rproc,
> > > > > +                                              client);
> > > > > +    struct device *dev = kproc->rproc->dev.parent;
> > > > > +    const char *name = kproc->rproc->name;
> > > > > +    u32 msg = (u32)(uintptr_t)(data);
> > > > > +
> > > > > +    dev_dbg(dev, "mbox msg: 0x%x\n", msg);
> > > > > +
> > > > > +    switch (msg) {
> > > > > +    case RP_MBOX_CRASH:
> > > > > +            /*
> > > > > +             * remoteproc detected an exception, but error recovery is not
> > > > > +             * supported. So, just log this for now
> > > > > +             */
> > > > > +            dev_err(dev, "K3 rproc %s crashed\n", name);
> > > > > +            break;
> > > > > +    case RP_MBOX_ECHO_REPLY:
> > > > > +            dev_info(dev, "received echo reply from %s\n", name);
> > > > > +            break;
> > > > > +    default:
> > > > > +            /* silently handle all other valid messages */
> > > > > +            if (msg >= RP_MBOX_READY && msg < RP_MBOX_END_MSG)
> > > > > +                    return;
> > > > > +            if (msg > kproc->rproc->max_notifyid) {
> > > > > +                    dev_dbg(dev, "dropping unknown message 0x%x", msg);
> > > > > +                    return;
> > > > > +            }
> > > > > +            /* msg contains the index of the triggered vring */
> > > > > +            if (rproc_vq_interrupt(kproc->rproc, msg) == IRQ_NONE)
> > > > > +                    dev_dbg(dev, "no message was found in vqid %d\n", msg);
> > > > > +    }
> > > > > +}
> > > > > +
> > > > > +/*
> > > > > + * Kick the remote processor to notify about pending unprocessed messages.
> > > > > + * The vqid usage is not used and is inconsequential, as the kick is performed
> > > > > + * through a simulated GPIO (a bit in an IPC interrupt-triggering register),
> > > > > + * the remote processor is expected to process both its Tx and Rx virtqueues.
> > > > > + */
> > > > > +static void k3_m4_rproc_kick(struct rproc *rproc, int vqid)
> > > > > +{
> > > > > +    struct k3_m4_rproc *kproc = rproc->priv;
> > > > > +    struct device *dev = rproc->dev.parent;
> > > > > +    u32 msg = (u32)vqid;
> > > > > +    int ret;
> > > > > +
> > > > > +    /* send the index of the triggered virtqueue in the mailbox payload */
> > > > > +    ret = mbox_send_message(kproc->mbox, (void *)(uintptr_t)msg);
> > > > > +    if (ret < 0)
> > > > > +            dev_err(dev, "failed to send mailbox message, status = %d\n",
> > > > > +                    ret);
> > > > > +}
> > > > > +
> > > > > +/* Put the remote processor into reset */
> > > > > +static int k3_m4_rproc_reset(struct k3_m4_rproc *kproc)
> > > > > +{
> > > > > +    struct device *dev = kproc->dev;
> > > > > +    int ret;
> > > > > +
> > > > > +    ret = reset_control_assert(kproc->reset);
> > > > > +    if (ret) {
> > > > > +            dev_err(dev, "local-reset assert failed, ret = %d\n", ret);
> > > > > +            return ret;
> > > > > +    }
> > > > > +
> > > > > +    if (kproc->data->uses_lreset)
> > > > > +            return ret;
> > > > > +
> > > > > +    ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
> > > > > +                                                kproc->ti_sci_id);
> > > > > +    if (ret) {
> > > > > +            dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
> > > > > +            if (reset_control_deassert(kproc->reset))
> > > > > +                    dev_warn(dev, "local-reset deassert back failed\n");
> > > > > +    }
> > > > > +
> > > > > +    return ret;
> > > > > +}
> > > > > +
> > > > > +/* Release the remote processor from reset */
> > > > > +static int k3_m4_rproc_release(struct k3_m4_rproc *kproc)
> > > > > +{
> > > > > +    struct device *dev = kproc->dev;
> > > > > +    int ret;
> > > > > +
> > > > > +    if (kproc->data->uses_lreset)
> > > > > +            goto lreset;
> > > > > +
> > > > > +    ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
> > > > > +                                                kproc->ti_sci_id);
> > > > > +    if (ret) {
> > > > > +            dev_err(dev, "module-reset deassert failed, ret = %d\n", ret);
> > > > > +            return ret;
> > > > > +    }
> > > > > +
> > > > > +lreset:
> > > > > +    ret = reset_control_deassert(kproc->reset);
> > > > > +    if (ret) {
> > > > > +            dev_err(dev, "local-reset deassert failed, ret = %d\n", ret);
> > > > > +            if (kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
> > > > > +                                                      kproc->ti_sci_id))
> > > > > +                    dev_warn(dev, "module-reset assert back failed\n");
> > > > > +    }
> > > > > +
> > > > > +    return ret;
> > > > > +}
> > > > > +
> > > > > +static int k3_m4_rproc_request_mbox(struct rproc *rproc)
> > > > > +{
> > > > > +    struct k3_m4_rproc *kproc = rproc->priv;
> > > > > +    struct mbox_client *client = &kproc->client;
> > > > > +    struct device *dev = kproc->dev;
> > > > > +    int ret;
> > > > > +
> > > > > +    client->dev = dev;
> > > > > +    client->tx_done = NULL;
> > > > > +    client->rx_callback = k3_m4_rproc_mbox_callback;
> > > > > +    client->tx_block = false;
> > > > > +    client->knows_txdone = false;
> > > > > +
> > > > > +    kproc->mbox = mbox_request_channel(client, 0);
> > > > > +    if (IS_ERR(kproc->mbox)) {
> > > > > +            ret = -EBUSY;
> > > > > +            dev_err(dev, "mbox_request_channel failed: %ld\n",
> > > > > +                    PTR_ERR(kproc->mbox));
> > > > > +            return ret;
> > > > > +    }
> > > > > +
> > > > > +    /*
> > > > > +     * Ping the remote processor, this is only for sanity-sake for now;
> > > > > +     * there is no functional effect whatsoever.
> > > > > +     *
> > > > > +     * Note that the reply will _not_ arrive immediately: this message
> > > > > +     * will wait in the mailbox fifo until the remote processor is booted.
> > > > > +     */
> > > > > +    ret = mbox_send_message(kproc->mbox, (void *)RP_MBOX_ECHO_REQUEST);
> > > > > +    if (ret < 0) {
> > > > > +            dev_err(dev, "mbox_send_message failed: %d\n", ret);
> > > > > +            mbox_free_channel(kproc->mbox);
> > > > > +            return ret;
> > > > > +    }
> > > > > +
> > > > > +    return 0;
> > > > > +}
> > > > > +
> > > > > +/*
> > > > > + * The M4 cores have a local reset that affects only the CPU, and a
> > > > > + * generic module reset that powers on the device and allows the internal
> > > > > + * memories to be accessed while the local reset is asserted. This function is
> > > > > + * used to release the global reset on remote cores to allow loading into the
> > > > > + * internal RAMs. The .prepare() ops is invoked by remoteproc core before any
> > > > > + * firmware loading, and is followed by the .start() ops after loading to
> > > > > + * actually let the remote cores to run. This callback is invoked only in
> > > > > + * remoteproc mode.
> > > > > + */
> > > > > +static int k3_m4_rproc_prepare(struct rproc *rproc)
> > > > > +{
> > > > > +    struct k3_m4_rproc *kproc = rproc->priv;
> > > > > +    struct device *dev = kproc->dev;
> > > > > +    int ret;
> > > > > +
> > > > > +    ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
> > > > > +                                                kproc->ti_sci_id);
> > > > > +    if (ret)
> > > > > +            dev_err(dev, "module-reset deassert failed, cannot enable internal RAM loading, ret = %d\n",
> > > > > +                    ret);
> > > > > +
> > > > > +    return ret;
> > > > > +}
> > > > > +
> > > > > +/*
> > > > > + * This function implements the .unprepare() ops and performs the complimentary
> > > > > + * operations to that of the .prepare() ops. The function is used to assert the
> > > > > + * global reset on applicable cores. This completes the second portion of
> > > > > + * powering down the remote core. The cores themselves are only halted in the
> > > > > + * .stop() callback through the local reset, and the .unprepare() ops is invoked
> > > > > + * by the remoteproc core after the remoteproc is stopped to balance the global
> > > > > + * reset. This callback is invoked only in remoteproc mode.
> > > > > + */
> > > > > +static int k3_m4_rproc_unprepare(struct rproc *rproc)
> > > > > +{
> > > > > +    struct k3_m4_rproc *kproc = rproc->priv;
> > > > > +    struct device *dev = kproc->dev;
> > > > > +    int ret;
> > > > > +
> > > > > +    ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
> > > > > +                                                kproc->ti_sci_id);
> > > > > +    if (ret)
> > > > > +            dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
> > > > > +
> > > > > +    return ret;
> > > > > +}
> > > > > +
> > > > > +/*
> > > > > + * This function implements the .get_loaded_rsc_table() callback and is used
> > > > > + * to provide the resource table for a booted remote processor in IPC-only
> > > > > + * mode. The remote processor firmwares follow a design-by-contract approach
> > > > > + * and are expected to have the resource table at the base of the DDR region
> > > > > + * reserved for firmware usage. This provides flexibility for the remote
> > > > > + * processor to be booted by different bootloaders that may or may not have the
> > > > > + * ability to publish the resource table address and size through a DT
> > > > > + * property.
> > > > > + */
> > > > > +static struct resource_table *k3_m4_get_loaded_rsc_table(struct rproc *rproc,
> > > > > +                                                     size_t *rsc_table_sz)
> > > > > +{
> > > > > +    struct k3_m4_rproc *kproc = rproc->priv;
> > > > > +    struct device *dev = kproc->dev;
> > > > > +
> > > > > +    if (!kproc->rmem[0].cpu_addr) {
> > > > > +            dev_err(dev, "memory-region #1 does not exist, loaded rsc table can't be found");
> > > > > +            return ERR_PTR(-ENOMEM);
> > > > > +    }
> > > > > +
> > > > > +    /*
> > > > > +     * NOTE: The resource table size is currently hard-coded to a maximum
> > > > > +     * of 256 bytes. The most common resource table usage for K3 firmwares
> > > > > +     * is to only have the vdev resource entry and an optional trace entry.
> > > > > +     * The exact size could be computed based on resource table address, but
> > > > > +     * the hard-coded value suffices to support the IPC-only mode.
> > > > > +     */
> > > > > +    *rsc_table_sz = 256;
> > > > > +    return (__force struct resource_table *)kproc->rmem[0].cpu_addr;
> > > > > +}
> > > > > +
> > > > > +/*
> > > > > + * Custom function to translate a remote processor device address (internal
> > > > > + * RAMs only) to a kernel virtual address.  The remote processors can access
> > > > > + * their RAMs at either an internal address visible only from a remote
> > > > > + * processor, or at the SoC-level bus address. Both these addresses need to be
> > > > > + * looked through for translation. The translated addresses can be used either
> > > > > + * by the remoteproc core for loading (when using kernel remoteproc loader), or
> > > > > + * by any rpmsg bus drivers.
> > > > > + */
> > > > > +static void *k3_m4_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
> > > > > +{
> > > > > +    struct k3_m4_rproc *kproc = rproc->priv;
> > > > > +    void __iomem *va = NULL;
> > > > > +    phys_addr_t bus_addr;
> > > > > +    u32 dev_addr, offset;
> > > > > +    size_t size;
> > > > > +    int i;
> > > > > +
> > > > > +    if (len == 0)
> > > > > +            return NULL;
> > > > > +
> > > > > +    for (i = 0; i < kproc->num_mems; i++) {
> > > > > +            bus_addr = kproc->mem[i].bus_addr;
> > > > > +            dev_addr = kproc->mem[i].dev_addr;
> > > > > +            size = kproc->mem[i].size;
> > > > > +
> > > > > +            /* handle M4-view addresses */
> > > > > +            if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
> > > > > +                    offset = da - dev_addr;
> > > > > +                    va = kproc->mem[i].cpu_addr + offset;
> > > > > +                    return (__force void *)va;
> > > > > +            }
> > > > > +
> > > > > +            /* handle SoC-view addresses */
> > > > > +            if (da >= bus_addr && ((da + len) <= (bus_addr + size))) {
> > > > > +                    offset = da - bus_addr;
> > > > > +                    va = kproc->mem[i].cpu_addr + offset;
> > > > > +                    return (__force void *)va;
> > > > > +            }
> > > > > +    }
> > > > > +
> > > > > +    /* handle static DDR reserved memory regions */
> > > > > +    for (i = 0; i < kproc->num_rmems; i++) {
> > > > > +            dev_addr = kproc->rmem[i].dev_addr;
> > > > > +            size = kproc->rmem[i].size;
> > > > > +
> > > > > +            if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
> > > > > +                    offset = da - dev_addr;
> > > > > +                    va = kproc->rmem[i].cpu_addr + offset;
> > > > > +                    return (__force void *)va;
> > > > > +            }
> > > > > +    }
> > > > > +
> > > > > +    return NULL;
> > > > > +}
> > > > > +
> > > > > +static int k3_m4_rproc_of_get_memories(struct platform_device *pdev,
> > > > > +                                   struct k3_m4_rproc *kproc)
> > > > > +{
> > > > > +    const struct k3_m4_rproc_dev_data *data = kproc->data;
> > > > > +    struct device *dev = &pdev->dev;
> > > > > +    struct resource *res;
> > > > > +    int num_mems = 0;
> > > > > +    int i;
> > > > > +
> > > > > +    num_mems = kproc->data->num_mems;
> > > > > +    kproc->mem = devm_kcalloc(kproc->dev, num_mems,
> > > > > +                              sizeof(*kproc->mem), GFP_KERNEL);
> > > > > +    if (!kproc->mem)
> > > > > +            return -ENOMEM;
> > > > > +
> > > > > +    for (i = 0; i < num_mems; i++) {
> > > > > +            res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > > > > +                                               data->mems[i].name);
> > > > > +            if (!res) {
> > > > > +                    dev_err(dev, "found no memory resource for %s\n",
> > > > > +                            data->mems[i].name);
> > > > > +                    return -EINVAL;
> > > > > +            }
> > > > > +            if (!devm_request_mem_region(dev, res->start,
> > > > > +                                         resource_size(res),
> > > > > +                                         dev_name(dev))) {
> > > > > +                    dev_err(dev, "could not request %s region for resource\n",
> > > > > +                            data->mems[i].name);
> > > > > +                    return -EBUSY;
> > > > > +            }
> > > > > +
> > > > > +            kproc->mem[i].cpu_addr = devm_ioremap_wc(dev, res->start,
> > > > > +                                                     resource_size(res));
> > > > > +            if (!kproc->mem[i].cpu_addr) {
> > > > > +                    dev_err(dev, "failed to map %s memory\n",
> > > > > +                            data->mems[i].name);
> > > > > +                    return -ENOMEM;
> > > > > +            }
> > > > > +            kproc->mem[i].bus_addr = res->start;
> > > > > +            kproc->mem[i].dev_addr = data->mems[i].dev_addr;
> > > > > +            kproc->mem[i].size = resource_size(res);
> > > > > +
> > > > > +            dev_dbg(dev, "memory %8s: bus addr %pa size 0x%zx va %pK da 0x%x\n",
> > > > > +                    data->mems[i].name, &kproc->mem[i].bus_addr,
> > > > > +                    kproc->mem[i].size, kproc->mem[i].cpu_addr,
> > > > > +                    kproc->mem[i].dev_addr);
> > > > > +    }
> > > > > +    kproc->num_mems = num_mems;
> > > > > +
> > > > > +    return 0;
> > > > > +}
> > > > > +
> > > > > +static void k3_m4_rproc_dev_mem_release(void *data)
> > > > > +{
> > > > > +    struct device *dev = data;
> > > > > +
> > > > > +    of_reserved_mem_device_release(dev);
> > > > > +}
> > > > > +
> > > > > +static int k3_m4_reserved_mem_init(struct k3_m4_rproc *kproc)
> > > > > +{
> > > > > +    struct device *dev = kproc->dev;
> > > > > +    struct device_node *np = dev->of_node;
> > > > > +    struct device_node *rmem_np;
> > > > > +    struct reserved_mem *rmem;
> > > > > +    int num_rmems;
> > > > > +    int ret, i;
> > > > > +
> > > > > +    num_rmems = of_property_count_elems_of_size(np, "memory-region",
> > > > > +                                                sizeof(phandle));
> > > > > +    if (num_rmems < 0) {
> > > > > +            dev_err(dev, "device does not reserved memory regions (%pe)\n",
> > > > > +                    ERR_PTR(num_rmems));
> > > > > +            return -EINVAL;
> > > > > +    }
> > > > > +    if (num_rmems < 2) {
> > > > > +            dev_err(dev, "device needs at least two memory regions to be defined, num = %d\n",
> > > > > +                    num_rmems);
> > > > > +            return -EINVAL;
> > > > > +    }
> > > > > +
> > > > > +    /* use reserved memory region 0 for vring DMA allocations */
> > > > > +    ret = of_reserved_mem_device_init_by_idx(dev, np, 0);
> > > > > +    if (ret) {
> > > > > +            dev_err(dev, "device cannot initialize DMA pool (%pe)\n",
> > > > > +                    ERR_PTR(ret));
> > > > > +            return ret;
> > > > > +    }
> > > > > +    ret = devm_add_action_or_reset(dev, k3_m4_rproc_dev_mem_release, dev);
> > > > > +    if (ret)
> > > > > +            return ret;
> > > > > +
> > > > > +    num_rmems--;
> > > > > +    kproc->rmem = devm_kcalloc(dev, num_rmems, sizeof(*kproc->rmem), GFP_KERNEL);
> > > > > +    if (!kproc->rmem)
> > > > > +            return -ENOMEM;
> > > > > +
> > > > > +    /* use remaining reserved memory regions for static carveouts */
> > > > > +    for (i = 0; i < num_rmems; i++) {
> > > > > +            rmem_np = of_parse_phandle(np, "memory-region", i + 1);
> > > > > +            if (!rmem_np)
> > > > > +                    return -EINVAL;
> > > > > +
> > > > > +            rmem = of_reserved_mem_lookup(rmem_np);
> > > > > +            if (!rmem) {
> > > > > +                    of_node_put(rmem_np);
> > > > > +                    return -EINVAL;
> > > > > +            }
> > > > > +            of_node_put(rmem_np);
> > > > > +
> > > > > +            kproc->rmem[i].bus_addr = rmem->base;
> > > > > +            /* 64-bit address regions currently not supported */
> > > > > +            kproc->rmem[i].dev_addr = (u32)rmem->base;
> > > > > +            kproc->rmem[i].size = rmem->size;
> > > > > +            kproc->rmem[i].cpu_addr = devm_ioremap_wc(dev, rmem->base, rmem->size);
> > > > > +            if (!kproc->rmem[i].cpu_addr) {
> > > > > +                    dev_err(dev, "failed to map reserved memory#%d at %pa of size %pa\n",
> > > > > +                            i + 1, &rmem->base, &rmem->size);
> > > > > +                    return -ENOMEM;
> > > > > +            }
> > > > > +
> > > > > +            dev_dbg(dev, "reserved memory%d: bus addr %pa size 0x%zx va %pK da 0x%x\n",
> > > > > +                    i + 1, &kproc->rmem[i].bus_addr,
> > > > > +                    kproc->rmem[i].size, kproc->rmem[i].cpu_addr,
> > > > > +                    kproc->rmem[i].dev_addr);
> > > > > +    }
> > > > > +    kproc->num_rmems = num_rmems;
> > > > > +
> > > > > +    return 0;
> > > > > +}
> > > > > +
> > > > > +static struct ti_sci_proc *k3_m4_rproc_of_get_tsp(struct device *dev,
> > > > > +                                              const struct ti_sci_handle *sci)
> > > > > +{
> > > > > +    struct ti_sci_proc *tsp;
> > > > > +    u32 temp[2];
> > > > > +    int ret;
> > > > > +
> > > > > +    ret = of_property_read_u32_array(dev->of_node, "ti,sci-proc-ids",
> > > > > +                                     temp, 2);
> > > > > +    if (ret < 0)
> > > > > +            return ERR_PTR(ret);
> > > > > +
> > > > > +    tsp = devm_kzalloc(dev, sizeof(*tsp), GFP_KERNEL);
> > > > > +    if (!tsp)
> > > > > +            return ERR_PTR(-ENOMEM);
> > > > > +
> > > > > +    tsp->dev = dev;
> > > > > +    tsp->sci = sci;
> > > > > +    tsp->ops = &sci->ops.proc_ops;
> > > > > +    tsp->proc_id = temp[0];
> > > > > +    tsp->host_id = temp[1];
> > > > > +
> > > > > +    return tsp;
> > > > > +}
> > > > > +
> > > > > +static void k3_m4_release_tsp(void *data)
> > > > > +{
> > > > > +    struct ti_sci_proc *tsp = data;
> > > > > +
> > > > > +    ti_sci_proc_release(tsp);
> > > > > +}
> > > > > +
> > > > > +/*
> > > > > + * Power up the M4F remote processor.
> > > > > + *
> > > > > + * This function will be invoked only after the firmware for this rproc
> > > > > + * was loaded, parsed successfully, and all of its resource requirements
> > > > > + * were met. This callback is invoked only in remoteproc mode.
> > > > > + */
> > > > > +static int k3_m4_rproc_start(struct rproc *rproc)
> > > > > +{
> > > > > +    struct k3_m4_rproc *kproc = rproc->priv;
> > > > > +    int ret;
> > > > > +
> > > > > +    ret = k3_m4_rproc_request_mbox(rproc);
> > > > > +    if (ret)
> > > > > +            return ret;
> > > > > +
> > > > > +    ret = k3_m4_rproc_release(kproc);
> > > > > +    if (ret)
> > > > > +            goto put_mbox;
> > > > > +
> > > > > +    return 0;
> > > > > +
> > > > > +put_mbox:
> > > > > +    mbox_free_channel(kproc->mbox);
> > > > > +    return ret;
> > > > > +}
> > > > > +
> > > > > +/*
> > > > > + * Stop the M4 remote processor.
> > > > > + *
> > > > > + * This function puts the M4 processor into reset, and finishes processing
> > > > > + * of any pending messages. This callback is invoked only in remoteproc mode.
> > > > > + */
> > > > > +static int k3_m4_rproc_stop(struct rproc *rproc)
> > > > > +{
> > > > > +    struct k3_m4_rproc *kproc = rproc->priv;
> > > > > +
> > > > > +    mbox_free_channel(kproc->mbox);
> > > > > +
> > > > > +    k3_m4_rproc_reset(kproc);
> > > > > +
> > > > > +    return 0;
> > > > > +}
> > > > > +
> > > > > +/*
> > > > > + * Attach to a running M4 remote processor (IPC-only mode)
> > > > > + *
> > > > > + * This rproc attach callback only needs to request the mailbox, the remote
> > > > > + * processor is already booted, so there is no need to issue any TI-SCI
> > > > > + * commands to boot the M4 core. This callback is used only in IPC-only mode.
> > > > > + */
> > > > > +static int k3_m4_rproc_attach(struct rproc *rproc)
> > > > > +{
> > > > > +    struct k3_m4_rproc *kproc = rproc->priv;
> > > > > +    struct device *dev = kproc->dev;
> > > > > +    int ret;
> > > > > +
> > > > > +    ret = k3_m4_rproc_request_mbox(rproc);
> > > > > +    if (ret)
> > > > > +            return ret;
> > > > > +
> > > > > +    dev_info(dev, "M4 initialized in IPC-only mode\n");
> > > > > +    return 0;
> > > > > +}
> > > > > +
> > > > > +/*
> > > > > + * Detach from a running M4 remote processor (IPC-only mode)
> > > > > + *
> > > > > + * This rproc detach callback performs the opposite operation to attach callback
> > > > > + * and only needs to release the mailbox, the M4 core is not stopped and will
> > > > > + * be left to continue to run its booted firmware. This callback is invoked only in
> > > > > + * IPC-only mode.
> > > > > + */
> > > > > +static int k3_m4_rproc_detach(struct rproc *rproc)
> > > > > +{
> > > > > +    struct k3_m4_rproc *kproc = rproc->priv;
> > > > > +    struct device *dev = kproc->dev;
> > > > > +
> > > > > +    mbox_free_channel(kproc->mbox);
> > > > > +    dev_info(dev, "M4 deinitialized in IPC-only mode\n");
> > > > > +    return 0;
> > > > > +}
> > > > > +
> > > > > +static const struct rproc_ops k3_m4_rproc_ops = {
> > > > > +    .start          = k3_m4_rproc_start,
> > > > > +    .stop           = k3_m4_rproc_stop,
> > > > > +    .attach         = k3_m4_rproc_attach,
> > > > > +    .detach         = k3_m4_rproc_detach,
> > > > > +    .kick           = k3_m4_rproc_kick,
> > > > > +    .da_to_va       = k3_m4_rproc_da_to_va,
> > > > > +    .get_loaded_rsc_table = k3_m4_get_loaded_rsc_table,
> > > > > +};
> > > > > +
> > > > > +static int k3_m4_rproc_probe(struct platform_device *pdev)
> > > > > +{
> > > > > +    struct device *dev = &pdev->dev;
> > > > > +    struct device_node *np = dev->of_node;
> > > > > +    const struct k3_m4_rproc_dev_data *data;
> > > > > +    struct k3_m4_rproc *kproc;
> > > > > +    struct rproc *rproc;
> > > > > +    const char *fw_name;
> > > > > +    bool r_state = false;
> > > > > +    bool p_state = false;
> > > > > +    int ret = 0;
> > > > > +
> > > > > +    data = device_get_match_data(dev);
> > > > > +    if (!data)
> > > > > +            return -ENODEV;
> > > > > +
> > > > > +    ret = rproc_of_parse_firmware(dev, 0, &fw_name);
> > > > > +    if (ret)
> > > > > +            return dev_err_probe(dev, ret, "failed to parse firmware-name property\n");
> > > > > +
> > > > > +    rproc = devm_rproc_alloc(dev, dev_name(dev), &k3_m4_rproc_ops, fw_name,
> > > > > +                             sizeof(*kproc));
> > > > > +    if (!rproc)
> > > > > +            return -ENOMEM;
> > > > > +
> > > > > +    rproc->has_iommu = false;
> > > > > +    rproc->recovery_disabled = true;
> > > > > +    if (data->uses_lreset) {
> > > > > +            rproc->ops->prepare = k3_m4_rproc_prepare;
> > > > > +            rproc->ops->unprepare = k3_m4_rproc_unprepare;
> > > > > +    }
> > > > > +    kproc = rproc->priv;
> > > > > +    kproc->rproc = rproc;
> > > > > +    kproc->dev = dev;
> > > > > +    kproc->data = data;
> > > > > +
> > > > > +    kproc->ti_sci = devm_ti_sci_get_by_phandle(dev, "ti,sci");
> > > > > +    if (IS_ERR(kproc->ti_sci))
> > > > > +            return dev_err_probe(dev, PTR_ERR(kproc->ti_sci),
> > > > > +                                 "failed to get ti-sci handle\n");
> > > > > +
> > > > > +    ret = of_property_read_u32(np, "ti,sci-dev-id", &kproc->ti_sci_id);
> > > > > +    if (ret)
> > > > > +            return dev_err_probe(dev, ret, "missing 'ti,sci-dev-id' property\n");
> > > > > +
> > > > > +    kproc->reset = devm_reset_control_get_exclusive(dev, NULL);
> > > > > +    if (IS_ERR(kproc->reset))
> > > > > +            return dev_err_probe(dev, PTR_ERR(kproc->reset), "failed to get reset\n");
> > > > 
> > > > What happens when devm_reset_control_get_exclusive() returns NULL?
> > > > 
> > > 
> > > Only the _optional_ version of this fuction can return NULL, this fuction
> > > will always return an error if the reset cannot be taken.
> > > 
> > 
> > What does optional mean?  Regardless, it's only a matter of time
> > before some automated tool starts complaining.
> > 
> 
> The "optional" versions of these reset_get functions (like reset_control_get_optional)
> will return NULL if the reset cannot be found. All the other reset_control_*() functions
> are built to take NULL as an argument without issue. That way if `kproc->reset`
> was set to NULL there is no failure (other than the reset wouldn't work, but as said,
> since this is not the optional version of this function, not finding the reset
> would return an error, never NULL).
>

After following the "optional" parameter in the reset subsystem, I agree with
your assessment.

> And, as NULL is a valid value for kproc->reset to have, no automated tool should ever
> complain (and if it did, the tool would need fixed as NULL is valid here).
>

All the functions using ->reset can handle a NULL value, so we are also good on
that front.

> > > > > +
> > > > > +    kproc->tsp = k3_m4_rproc_of_get_tsp(dev, kproc->ti_sci);
> > > > > +    if (IS_ERR(kproc->tsp))
> > > > > +            return dev_err_probe(dev, PTR_ERR(kproc->tsp),
> > > > > +                                 "failed to construct ti-sci proc control\n");
> > > > > +
> > > > > +    ret = ti_sci_proc_request(kproc->tsp);
> > > > > +    if (ret < 0)
> > > > > +            return dev_err_probe(dev, ret, "ti_sci_proc_request failed\n");
> > > > > +    ret = devm_add_action_or_reset(dev, k3_m4_release_tsp, kproc->tsp);
> > > > > +    if (ret)
> > > > > +            return ret;
> > > > > +
> > > > > +    ret = k3_m4_rproc_of_get_memories(pdev, kproc);
> > > > > +    if (ret)
> > > > > +            return ret;
> > > > > +
> > > > > +    ret = k3_m4_reserved_mem_init(kproc);
> > > > > +    if (ret)
> > > > > +            return dev_err_probe(dev, ret, "reserved memory init failed\n");
> > > > > +
> > > > > +    ret = kproc->ti_sci->ops.dev_ops.is_on(kproc->ti_sci, kproc->ti_sci_id,
> > > > > +                                           &r_state, &p_state);
> > > > > +    if (ret)
> > > > > +            return dev_err_probe(dev, ret,
> > > > > +                                 "failed to get initial state, mode cannot be determined\n");
> > > > > +
> > > > > +    /* configure devices for either remoteproc or IPC-only mode */
> > > > > +    if (p_state) {
> > > > > +            dev_info(dev, "configured M4 for IPC-only mode\n");
> > > > > +            rproc->state = RPROC_DETACHED;
> > > > > +            /* override rproc ops with only required IPC-only mode ops */
> > > > > +            rproc->ops->prepare = NULL;
> > > > > +            rproc->ops->unprepare = NULL;
> > > > > +            rproc->ops->start = NULL;
> > > > > +            rproc->ops->stop = NULL;
> > > > > +            rproc->ops->attach = k3_m4_rproc_attach;
> > > > > +            rproc->ops->detach = k3_m4_rproc_detach;
> > > > > +            rproc->ops->get_loaded_rsc_table = k3_m4_get_loaded_rsc_table;
> > > > 
> > > > Why are the last 3 assignment needed when they are already set in the
> > > > declaration of k3_m4_rproc_ops?
> > > > 
> > > 
> > > Good point, seems none of these overrides should be needed, start()/stop()
> > > are not called for ATTCHED/DETACHED cores anyway, opposite is true for attach()/detach().
> > > 
> > > I'll drop these overrides.
> > > 
> > > > > +    } else {
> > > > > +            dev_info(dev, "configured M4 for remoteproc mode\n");
> > > > > +            /*
> > > > > +             * ensure the M4 local reset is asserted to ensure the core
> > > > > +             * doesn't execute bogus code in .prepare() when the module
> > > > > +             * reset is released.
> > > > > +             */
> > > > > +            if (data->uses_lreset) {
> > > > > +                    ret = reset_control_status(kproc->reset);
> > > > > +                    if (ret < 0) {
> > > > > +                            return dev_err_probe(dev, ret, "failed to get reset status\n");
> > > > > +                    } else if (ret == 0) {
> > > > > +                            dev_warn(dev, "local reset is deasserted for device\n");
> > > > > +                            k3_m4_rproc_reset(kproc);
> > > > > +                    }
> > > > > +            }
> > > > > +    }
> > > > > +
> > > > > +    ret = devm_rproc_add(dev, rproc);
> > > > > +    if (ret)
> > > > > +            return dev_err_probe(dev, ret,
> > > > > +                                 "failed to add register device with remoteproc core\n");
> > > > > +
> > > > > +    return 0;
> > > > > +}
> > > > > +
> > > > > +static const struct k3_m4_rproc_mem_data am64_m4_mems[] = {
> > > > > +    { .name = "iram", .dev_addr = 0x0 },
> > > > > +    { .name = "dram", .dev_addr = 0x30000 },
> > > > > +};
> > > > 
> > > > Is this hardcoded in the hardware and never expected to change?  If not please
> > > > add to the DT bindings.
> > > > 
> > > 
> > > This is a hardware hardcoded address and will be the same for this class
> > > of K3 M4 cores.
> > > 
> > > Thanks,
> > > Andrew
> > > 
> > > > More comments later or tomorrow.
> > > > 
> > > > Thanks,
> > > > Mathieu
> > > > 
> > > > > +
> > > > > +static const struct k3_m4_rproc_dev_data am64_m4_data = {
> > > > > +    .mems = am64_m4_mems,
> > > > > +    .num_mems = ARRAY_SIZE(am64_m4_mems),
> > > > > +    .uses_lreset = true,
> > > > > +};
> > > > > +
> > > > > +static const struct of_device_id k3_m4_of_match[] = {
> > > > > +    { .compatible = "ti,am64-m4fss", .data = &am64_m4_data, },
> > > > > +    { /* sentinel */ },
> > > > > +};
> > > > > +MODULE_DEVICE_TABLE(of, k3_m4_of_match);
> > > > > +
> > > > > +static struct platform_driver k3_m4_rproc_driver = {
> > > > > +    .probe  = k3_m4_rproc_probe,
> > > > > +    .driver = {
> > > > > +            .name = "k3-m4-rproc",
> > > > > +            .of_match_table = k3_m4_of_match,
> > > > > +    },
> > > > > +};
> > > > > +module_platform_driver(k3_m4_rproc_driver);
> > > > > +
> > > > > +MODULE_AUTHOR("Hari Nagalla <hnagalla@ti.com>");
> > > > > +MODULE_DESCRIPTION("TI K3 M4 Remoteproc driver");
> > > > > +MODULE_LICENSE("GPL");
> > > > > --
> > > > > 2.39.2
> > > > > 

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Re: [PATCH v9 2/5] remoteproc: k3-m4: Add a remoteproc driver for M4F subsystem

[Mathieu Poirier]

On Fri, Apr 26, 2024 at 02:18:08PM -0500, Andrew Davis wrote:
> From: Martyn Welch <martyn.welch@collabora.com>
> 
> The AM62x and AM64x SoCs of the TI K3 family has a Cortex M4F core in
> the MCU domain. This core is typically used for safety applications in a
> stand alone mode. However, some application (non safety related) may
> want to use the M4F core as a generic remote processor with IPC to the
> host processor. The M4F core has internal IRAM and DRAM memories and are
> exposed to the system bus for code and data loading.
> 
> A remote processor driver is added to support this subsystem, including
> being able to load and boot the M4F core. Loading includes to M4F
> internal memories and predefined external code/data memories. The
> carve outs for external contiguous memory is defined in the M4F device
> node and should match with the external memory declarations in the M4F
> image binary. The M4F subsystem has two resets. One reset is for the
> entire subsystem i.e including the internal memories and the other, a
> local reset is only for the M4F processing core. When loading the image,
> the driver first releases the subsystem reset, loads the firmware image
> and then releases the local reset to let the M4F processing core run.
> 
> Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
> Signed-off-by: Hari Nagalla <hnagalla@ti.com>
> Signed-off-by: Andrew Davis <afd@ti.com>
> ---
>  drivers/remoteproc/Kconfig               |  13 +
>  drivers/remoteproc/Makefile              |   1 +
>  drivers/remoteproc/ti_k3_m4_remoteproc.c | 785 +++++++++++++++++++++++
>  3 files changed, 799 insertions(+)
>  create mode 100644 drivers/remoteproc/ti_k3_m4_remoteproc.c
> 
> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> index 48845dc8fa852..1a7c0330c91a9 100644
> --- a/drivers/remoteproc/Kconfig
> +++ b/drivers/remoteproc/Kconfig
> @@ -339,6 +339,19 @@ config TI_K3_DSP_REMOTEPROC
>  	  It's safe to say N here if you're not interested in utilizing
>  	  the DSP slave processors.
>  
> +config TI_K3_M4_REMOTEPROC
> +	tristate "TI K3 M4 remoteproc support"
> +	depends on ARCH_K3 || COMPILE_TEST
> +	select MAILBOX
> +	select OMAP2PLUS_MBOX
> +	help
> +	  Say m here to support TI's M4 remote processor subsystems
> +	  on various TI K3 family of SoCs through the remote processor
> +	  framework.
> +
> +	  It's safe to say N here if you're not interested in utilizing
> +	  a remote processor.
> +
>  config TI_K3_R5_REMOTEPROC
>  	tristate "TI K3 R5 remoteproc support"
>  	depends on ARCH_K3
> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
> index 91314a9b43cef..5ff4e2fee4abd 100644
> --- a/drivers/remoteproc/Makefile
> +++ b/drivers/remoteproc/Makefile
> @@ -37,5 +37,6 @@ obj-$(CONFIG_ST_REMOTEPROC)		+= st_remoteproc.o
>  obj-$(CONFIG_ST_SLIM_REMOTEPROC)	+= st_slim_rproc.o
>  obj-$(CONFIG_STM32_RPROC)		+= stm32_rproc.o
>  obj-$(CONFIG_TI_K3_DSP_REMOTEPROC)	+= ti_k3_dsp_remoteproc.o
> +obj-$(CONFIG_TI_K3_M4_REMOTEPROC)	+= ti_k3_m4_remoteproc.o
>  obj-$(CONFIG_TI_K3_R5_REMOTEPROC)	+= ti_k3_r5_remoteproc.o
>  obj-$(CONFIG_XLNX_R5_REMOTEPROC)	+= xlnx_r5_remoteproc.o
> diff --git a/drivers/remoteproc/ti_k3_m4_remoteproc.c b/drivers/remoteproc/ti_k3_m4_remoteproc.c
> new file mode 100644
> index 0000000000000..0030e509f6b5d
> --- /dev/null
> +++ b/drivers/remoteproc/ti_k3_m4_remoteproc.c
> @@ -0,0 +1,785 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * TI K3 Cortex-M4 Remote Processor(s) driver
> + *
> + * Copyright (C) 2021-2024 Texas Instruments Incorporated - https://www.ti.com/
> + *	Hari Nagalla <hnagalla@ti.com>
> + */
> +
> +#include <linux/io.h>
> +#include <linux/mailbox_client.h>
> +#include <linux/module.h>
> +#include <linux/of_address.h>
> +#include <linux/of_reserved_mem.h>
> +#include <linux/platform_device.h>
> +#include <linux/remoteproc.h>
> +#include <linux/reset.h>
> +#include <linux/slab.h>
> +
> +#include "omap_remoteproc.h"
> +#include "remoteproc_internal.h"
> +#include "ti_sci_proc.h"
> +
> +/**
> + * struct k3_m4_rproc_mem - internal memory structure
> + * @cpu_addr: MPU virtual address of the memory region
> + * @bus_addr: Bus address used to access the memory region
> + * @dev_addr: Device address of the memory region from remote processor view
> + * @size: Size of the memory region
> + */
> +struct k3_m4_rproc_mem {
> +	void __iomem *cpu_addr;
> +	phys_addr_t bus_addr;
> +	u32 dev_addr;
> +	size_t size;
> +};
> +
> +/**
> + * struct k3_m4_rproc_mem_data - memory definitions for a remote processor
> + * @name: name for this memory entry
> + * @dev_addr: device address for the memory entry
> + */
> +struct k3_m4_rproc_mem_data {
> +	const char *name;
> +	const u32 dev_addr;
> +};
> +
> +/**
> + * struct k3_m4_rproc_dev_data - device data structure for a remote processor
> + * @mems: pointer to memory definitions for a remote processor
> + * @num_mems: number of memory regions in @mems
> + * @uses_lreset: flag to denote the need for local reset management
> + */
> +struct k3_m4_rproc_dev_data {
> +	const struct k3_m4_rproc_mem_data *mems;
> +	u32 num_mems;
> +	bool uses_lreset;
> +};
> +
> +/**
> + * struct k3_m4_rproc - k3 remote processor driver structure
> + * @dev: cached device pointer
> + * @rproc: remoteproc device handle
> + * @mem: internal memory regions data
> + * @num_mems: number of internal memory regions
> + * @rmem: reserved memory regions data
> + * @num_rmems: number of reserved memory regions
> + * @reset: reset control handle
> + * @data: pointer to device data
> + * @tsp: TI-SCI processor control handle
> + * @ti_sci: TI-SCI handle
> + * @ti_sci_id: TI-SCI device identifier
> + * @mbox: mailbox channel handle
> + * @client: mailbox client to request the mailbox channel
> + */
> +struct k3_m4_rproc {
> +	struct device *dev;
> +	struct rproc *rproc;
> +	struct k3_m4_rproc_mem *mem;
> +	int num_mems;
> +	struct k3_m4_rproc_mem *rmem;
> +	int num_rmems;
> +	struct reset_control *reset;
> +	const struct k3_m4_rproc_dev_data *data;
> +	struct ti_sci_proc *tsp;
> +	const struct ti_sci_handle *ti_sci;
> +	u32 ti_sci_id;
> +	struct mbox_chan *mbox;
> +	struct mbox_client client;
> +};
> +
> +/**
> + * k3_m4_rproc_mbox_callback() - inbound mailbox message handler
> + * @client: mailbox client pointer used for requesting the mailbox channel
> + * @data: mailbox payload
> + *
> + * This handler is invoked by the K3 mailbox driver whenever a mailbox
> + * message is received. Usually, the mailbox payload simply contains
> + * the index of the virtqueue that is kicked by the remote processor,
> + * and we let remoteproc core handle it.
> + *
> + * In addition to virtqueue indices, we also have some out-of-band values
> + * that indicate different events. Those values are deliberately very
> + * large so they don't coincide with virtqueue indices.
> + */
> +static void k3_m4_rproc_mbox_callback(struct mbox_client *client, void *data)
> +{
> +	struct k3_m4_rproc *kproc = container_of(client, struct k3_m4_rproc,
> +						  client);
> +	struct device *dev = kproc->rproc->dev.parent;
> +	const char *name = kproc->rproc->name;
> +	u32 msg = (u32)(uintptr_t)(data);
> +
> +	dev_dbg(dev, "mbox msg: 0x%x\n", msg);
> +
> +	switch (msg) {
> +	case RP_MBOX_CRASH:
> +		/*
> +		 * remoteproc detected an exception, but error recovery is not
> +		 * supported. So, just log this for now
> +		 */
> +		dev_err(dev, "K3 rproc %s crashed\n", name);
> +		break;
> +	case RP_MBOX_ECHO_REPLY:
> +		dev_info(dev, "received echo reply from %s\n", name);
> +		break;
> +	default:
> +		/* silently handle all other valid messages */
> +		if (msg >= RP_MBOX_READY && msg < RP_MBOX_END_MSG)
> +			return;
> +		if (msg > kproc->rproc->max_notifyid) {
> +			dev_dbg(dev, "dropping unknown message 0x%x", msg);
> +			return;
> +		}
> +		/* msg contains the index of the triggered vring */
> +		if (rproc_vq_interrupt(kproc->rproc, msg) == IRQ_NONE)
> +			dev_dbg(dev, "no message was found in vqid %d\n", msg);
> +	}
> +}
> +
> +/*
> + * Kick the remote processor to notify about pending unprocessed messages.
> + * The vqid usage is not used and is inconsequential, as the kick is performed
> + * through a simulated GPIO (a bit in an IPC interrupt-triggering register),
> + * the remote processor is expected to process both its Tx and Rx virtqueues.
> + */
> +static void k3_m4_rproc_kick(struct rproc *rproc, int vqid)
> +{
> +	struct k3_m4_rproc *kproc = rproc->priv;
> +	struct device *dev = rproc->dev.parent;
> +	u32 msg = (u32)vqid;
> +	int ret;
> +
> +	/* send the index of the triggered virtqueue in the mailbox payload */
> +	ret = mbox_send_message(kproc->mbox, (void *)(uintptr_t)msg);

I remember discussing this but can't recall the outcome.  Still, I don't see
why (uintptr_t) is needed here.

> +	if (ret < 0)
> +		dev_err(dev, "failed to send mailbox message, status = %d\n",
> +			ret);
> +}
> +
> +/* Put the remote processor into reset */
> +static int k3_m4_rproc_reset(struct k3_m4_rproc *kproc)
> +{
> +	struct device *dev = kproc->dev;
> +	int ret;
> +
> +	ret = reset_control_assert(kproc->reset);
> +	if (ret) {
> +		dev_err(dev, "local-reset assert failed, ret = %d\n", ret);
> +		return ret;
> +	}
> +
> +	if (kproc->data->uses_lreset)
> +		return ret;
> +
> +	ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
> +						    kproc->ti_sci_id);
> +	if (ret) {
> +		dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
> +		if (reset_control_deassert(kproc->reset))
> +			dev_warn(dev, "local-reset deassert back failed\n");
> +	}
> +
> +	return ret;
> +}
> +
> +/* Release the remote processor from reset */
> +static int k3_m4_rproc_release(struct k3_m4_rproc *kproc)
> +{
> +	struct device *dev = kproc->dev;
> +	int ret;
> +
> +	if (kproc->data->uses_lreset)
> +		goto lreset;
> +
> +	ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
> +						    kproc->ti_sci_id);
> +	if (ret) {
> +		dev_err(dev, "module-reset deassert failed, ret = %d\n", ret);
> +		return ret;
> +	}
> +
> +lreset:
> +	ret = reset_control_deassert(kproc->reset);
> +	if (ret) {
> +		dev_err(dev, "local-reset deassert failed, ret = %d\n", ret);
> +		if (kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
> +							  kproc->ti_sci_id))

This is done unconditionally, even when dev_ops.get_device() above hasn't been
called.

> +			dev_warn(dev, "module-reset assert back failed\n");
> +	}
> +
> +	return ret;
> +}
> +
> +static int k3_m4_rproc_request_mbox(struct rproc *rproc)
> +{
> +	struct k3_m4_rproc *kproc = rproc->priv;
> +	struct mbox_client *client = &kproc->client;
> +	struct device *dev = kproc->dev;
> +	int ret;
> +
> +	client->dev = dev;
> +	client->tx_done = NULL;
> +	client->rx_callback = k3_m4_rproc_mbox_callback;
> +	client->tx_block = false;
> +	client->knows_txdone = false;
> +
> +	kproc->mbox = mbox_request_channel(client, 0);
> +	if (IS_ERR(kproc->mbox)) {
> +		ret = -EBUSY;
> +		dev_err(dev, "mbox_request_channel failed: %ld\n",
> +			PTR_ERR(kproc->mbox));
> +		return ret;
> +	}
> +
> +	/*
> +	 * Ping the remote processor, this is only for sanity-sake for now;
> +	 * there is no functional effect whatsoever.
> +	 *
> +	 * Note that the reply will _not_ arrive immediately: this message
> +	 * will wait in the mailbox fifo until the remote processor is booted.
> +	 */
> +	ret = mbox_send_message(kproc->mbox, (void *)RP_MBOX_ECHO_REQUEST);
> +	if (ret < 0) {
> +		dev_err(dev, "mbox_send_message failed: %d\n", ret);
> +		mbox_free_channel(kproc->mbox);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +/*
> + * The M4 cores have a local reset that affects only the CPU, and a
> + * generic module reset that powers on the device and allows the internal
> + * memories to be accessed while the local reset is asserted. This function is
> + * used to release the global reset on remote cores to allow loading into the
> + * internal RAMs. The .prepare() ops is invoked by remoteproc core before any
> + * firmware loading, and is followed by the .start() ops after loading to
> + * actually let the remote cores to run. This callback is invoked only in
> + * remoteproc mode.
> + */
> +static int k3_m4_rproc_prepare(struct rproc *rproc)
> +{
> +	struct k3_m4_rproc *kproc = rproc->priv;
> +	struct device *dev = kproc->dev;
> +	int ret;
> +
> +	ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
> +						    kproc->ti_sci_id);
> +	if (ret)
> +		dev_err(dev, "module-reset deassert failed, cannot enable internal RAM loading, ret = %d\n",
> +			ret);
> +
> +	return ret;
> +}
> +
> +/*
> + * This function implements the .unprepare() ops and performs the complimentary
> + * operations to that of the .prepare() ops. The function is used to assert the
> + * global reset on applicable cores. This completes the second portion of
> + * powering down the remote core. The cores themselves are only halted in the
> + * .stop() callback through the local reset, and the .unprepare() ops is invoked
> + * by the remoteproc core after the remoteproc is stopped to balance the global
> + * reset. This callback is invoked only in remoteproc mode.
> + */
> +static int k3_m4_rproc_unprepare(struct rproc *rproc)
> +{
> +	struct k3_m4_rproc *kproc = rproc->priv;
> +	struct device *dev = kproc->dev;
> +	int ret;
> +
> +	ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
> +						    kproc->ti_sci_id);
> +	if (ret)
> +		dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
> +
> +	return ret;
> +}
> +
> +/*
> + * This function implements the .get_loaded_rsc_table() callback and is used
> + * to provide the resource table for a booted remote processor in IPC-only
> + * mode. The remote processor firmwares follow a design-by-contract approach
> + * and are expected to have the resource table at the base of the DDR region
> + * reserved for firmware usage. This provides flexibility for the remote
> + * processor to be booted by different bootloaders that may or may not have the
> + * ability to publish the resource table address and size through a DT
> + * property.
> + */
> +static struct resource_table *k3_m4_get_loaded_rsc_table(struct rproc *rproc,
> +							 size_t *rsc_table_sz)
> +{
> +	struct k3_m4_rproc *kproc = rproc->priv;
> +	struct device *dev = kproc->dev;
> +
> +	if (!kproc->rmem[0].cpu_addr) {
> +		dev_err(dev, "memory-region #1 does not exist, loaded rsc table can't be found");
> +		return ERR_PTR(-ENOMEM);
> +	}
> +
> +	/*
> +	 * NOTE: The resource table size is currently hard-coded to a maximum
> +	 * of 256 bytes. The most common resource table usage for K3 firmwares
> +	 * is to only have the vdev resource entry and an optional trace entry.
> +	 * The exact size could be computed based on resource table address, but
> +	 * the hard-coded value suffices to support the IPC-only mode.
> +	 */
> +	*rsc_table_sz = 256;
> +	return (__force struct resource_table *)kproc->rmem[0].cpu_addr;
> +}
> +
> +/*
> + * Custom function to translate a remote processor device address (internal
> + * RAMs only) to a kernel virtual address.  The remote processors can access
> + * their RAMs at either an internal address visible only from a remote
> + * processor, or at the SoC-level bus address. Both these addresses need to be
> + * looked through for translation. The translated addresses can be used either
> + * by the remoteproc core for loading (when using kernel remoteproc loader), or
> + * by any rpmsg bus drivers.
> + */
> +static void *k3_m4_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
> +{
> +	struct k3_m4_rproc *kproc = rproc->priv;
> +	void __iomem *va = NULL;
> +	phys_addr_t bus_addr;
> +	u32 dev_addr, offset;
> +	size_t size;
> +	int i;
> +
> +	if (len == 0)
> +		return NULL;
> +
> +	for (i = 0; i < kproc->num_mems; i++) {
> +		bus_addr = kproc->mem[i].bus_addr;
> +		dev_addr = kproc->mem[i].dev_addr;
> +		size = kproc->mem[i].size;
> +
> +		/* handle M4-view addresses */
> +		if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
> +			offset = da - dev_addr;
> +			va = kproc->mem[i].cpu_addr + offset;
> +			return (__force void *)va;
> +		}
> +
> +		/* handle SoC-view addresses */
> +		if (da >= bus_addr && ((da + len) <= (bus_addr + size))) {
> +			offset = da - bus_addr;
> +			va = kproc->mem[i].cpu_addr + offset;
> +			return (__force void *)va;
> +		}
> +	}
> +
> +	/* handle static DDR reserved memory regions */
> +	for (i = 0; i < kproc->num_rmems; i++) {
> +		dev_addr = kproc->rmem[i].dev_addr;
> +		size = kproc->rmem[i].size;
> +
> +		if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
> +			offset = da - dev_addr;
> +			va = kproc->rmem[i].cpu_addr + offset;
> +			return (__force void *)va;
> +		}
> +	}
> +
> +	return NULL;
> +}
> +
> +static int k3_m4_rproc_of_get_memories(struct platform_device *pdev,
> +				       struct k3_m4_rproc *kproc)
> +{
> +	const struct k3_m4_rproc_dev_data *data = kproc->data;
> +	struct device *dev = &pdev->dev;
> +	struct resource *res;
> +	int num_mems = 0;
> +	int i;
> +
> +	num_mems = kproc->data->num_mems;
> +	kproc->mem = devm_kcalloc(kproc->dev, num_mems,
> +				  sizeof(*kproc->mem), GFP_KERNEL);
> +	if (!kproc->mem)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < num_mems; i++) {
> +		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> +						   data->mems[i].name);
> +		if (!res) {
> +			dev_err(dev, "found no memory resource for %s\n",
> +				data->mems[i].name);
> +			return -EINVAL;
> +		}
> +		if (!devm_request_mem_region(dev, res->start,
> +					     resource_size(res),
> +					     dev_name(dev))) {
> +			dev_err(dev, "could not request %s region for resource\n",
> +				data->mems[i].name);
> +			return -EBUSY;
> +		}
> +
> +		kproc->mem[i].cpu_addr = devm_ioremap_wc(dev, res->start,
> +							 resource_size(res));
> +		if (!kproc->mem[i].cpu_addr) {
> +			dev_err(dev, "failed to map %s memory\n",
> +				data->mems[i].name);
> +			return -ENOMEM;
> +		}
> +		kproc->mem[i].bus_addr = res->start;
> +		kproc->mem[i].dev_addr = data->mems[i].dev_addr;
> +		kproc->mem[i].size = resource_size(res);
> +
> +		dev_dbg(dev, "memory %8s: bus addr %pa size 0x%zx va %pK da 0x%x\n",
> +			data->mems[i].name, &kproc->mem[i].bus_addr,

I'm pretty sure you are intrested in kproc->mem[i].bus_addr rather than
&kproc->mem[i].bus_addr.

> +			kproc->mem[i].size, kproc->mem[i].cpu_addr,
> +			kproc->mem[i].dev_addr);
> +	}
> +	kproc->num_mems = num_mems;
> +
> +	return 0;
> +}
> +
> +static void k3_m4_rproc_dev_mem_release(void *data)
> +{
> +	struct device *dev = data;
> +
> +	of_reserved_mem_device_release(dev);
> +}
> +
> +static int k3_m4_reserved_mem_init(struct k3_m4_rproc *kproc)
> +{
> +	struct device *dev = kproc->dev;
> +	struct device_node *np = dev->of_node;
> +	struct device_node *rmem_np;
> +	struct reserved_mem *rmem;
> +	int num_rmems;
> +	int ret, i;
> +
> +	num_rmems = of_property_count_elems_of_size(np, "memory-region",
> +						    sizeof(phandle));
> +	if (num_rmems < 0) {
> +		dev_err(dev, "device does not reserved memory regions (%pe)\n",
> +			ERR_PTR(num_rmems));

Why use %pe and ERR_PTR() when function of_property_count_elems_of_size()
returns a simple error code?

> +		return -EINVAL;
> +	}
> +	if (num_rmems < 2) {
> +		dev_err(dev, "device needs at least two memory regions to be defined, num = %d\n",
> +			num_rmems);
> +		return -EINVAL;
> +	}
> +
> +	/* use reserved memory region 0 for vring DMA allocations */
> +	ret = of_reserved_mem_device_init_by_idx(dev, np, 0);
> +	if (ret) {
> +		dev_err(dev, "device cannot initialize DMA pool (%pe)\n",
> +			ERR_PTR(ret));

Same

> +		return ret;
> +	}
> +	ret = devm_add_action_or_reset(dev, k3_m4_rproc_dev_mem_release, dev);
> +	if (ret)
> +		return ret;
> +
> +	num_rmems--;
> +	kproc->rmem = devm_kcalloc(dev, num_rmems, sizeof(*kproc->rmem), GFP_KERNEL);
> +	if (!kproc->rmem)
> +		return -ENOMEM;
> +
> +	/* use remaining reserved memory regions for static carveouts */
> +	for (i = 0; i < num_rmems; i++) {
> +		rmem_np = of_parse_phandle(np, "memory-region", i + 1);
> +		if (!rmem_np)
> +			return -EINVAL;
> +
> +		rmem = of_reserved_mem_lookup(rmem_np);
> +		if (!rmem) {
> +			of_node_put(rmem_np);
> +			return -EINVAL;
> +		}
> +		of_node_put(rmem_np);
> +
> +		kproc->rmem[i].bus_addr = rmem->base;
> +		/* 64-bit address regions currently not supported */
> +		kproc->rmem[i].dev_addr = (u32)rmem->base;
> +		kproc->rmem[i].size = rmem->size;
> +		kproc->rmem[i].cpu_addr = devm_ioremap_wc(dev, rmem->base, rmem->size);
> +		if (!kproc->rmem[i].cpu_addr) {
> +			dev_err(dev, "failed to map reserved memory#%d at %pa of size %pa\n",
> +				i + 1, &rmem->base, &rmem->size);
> +			return -ENOMEM;
> +		}
> +
> +		dev_dbg(dev, "reserved memory%d: bus addr %pa size 0x%zx va %pK da 0x%x\n",
> +			i + 1, &kproc->rmem[i].bus_addr,
> +			kproc->rmem[i].size, kproc->rmem[i].cpu_addr,
> +			kproc->rmem[i].dev_addr);
> +	}
> +	kproc->num_rmems = num_rmems;
> +
> +	return 0;
> +}
> +
> +static struct ti_sci_proc *k3_m4_rproc_of_get_tsp(struct device *dev,
> +						  const struct ti_sci_handle *sci)
> +{
> +	struct ti_sci_proc *tsp;
> +	u32 temp[2];
> +	int ret;
> +
> +	ret = of_property_read_u32_array(dev->of_node, "ti,sci-proc-ids",
> +					 temp, 2);
> +	if (ret < 0)
> +		return ERR_PTR(ret);
> +
> +	tsp = devm_kzalloc(dev, sizeof(*tsp), GFP_KERNEL);
> +	if (!tsp)
> +		return ERR_PTR(-ENOMEM);
> +
> +	tsp->dev = dev;
> +	tsp->sci = sci;
> +	tsp->ops = &sci->ops.proc_ops;
> +	tsp->proc_id = temp[0];
> +	tsp->host_id = temp[1];
> +
> +	return tsp;
> +}
> +
> +static void k3_m4_release_tsp(void *data)
> +{
> +	struct ti_sci_proc *tsp = data;
> +
> +	ti_sci_proc_release(tsp);
> +}
> +
> +/*
> + * Power up the M4F remote processor.
> + *
> + * This function will be invoked only after the firmware for this rproc
> + * was loaded, parsed successfully, and all of its resource requirements
> + * were met. This callback is invoked only in remoteproc mode.
> + */
> +static int k3_m4_rproc_start(struct rproc *rproc)
> +{
> +	struct k3_m4_rproc *kproc = rproc->priv;
> +	int ret;
> +
> +	ret = k3_m4_rproc_request_mbox(rproc);
> +	if (ret)
> +		return ret;
> +
> +	ret = k3_m4_rproc_release(kproc);
> +	if (ret)
> +		goto put_mbox;
> +
> +	return 0;
> +
> +put_mbox:
> +	mbox_free_channel(kproc->mbox);
> +	return ret;
> +}
> +
> +/*
> + * Stop the M4 remote processor.
> + *
> + * This function puts the M4 processor into reset, and finishes processing
> + * of any pending messages. This callback is invoked only in remoteproc mode.
> + */
> +static int k3_m4_rproc_stop(struct rproc *rproc)
> +{
> +	struct k3_m4_rproc *kproc = rproc->priv;
> +
> +	mbox_free_channel(kproc->mbox);
> +
> +	k3_m4_rproc_reset(kproc);
> +
> +	return 0;
> +}
> +
> +/*
> + * Attach to a running M4 remote processor (IPC-only mode)
> + *
> + * This rproc attach callback only needs to request the mailbox, the remote
> + * processor is already booted, so there is no need to issue any TI-SCI
> + * commands to boot the M4 core. This callback is used only in IPC-only mode.
> + */
> +static int k3_m4_rproc_attach(struct rproc *rproc)
> +{
> +	struct k3_m4_rproc *kproc = rproc->priv;
> +	struct device *dev = kproc->dev;
> +	int ret;
> +
> +	ret = k3_m4_rproc_request_mbox(rproc);
> +	if (ret)
> +		return ret;
> +
> +	dev_info(dev, "M4 initialized in IPC-only mode\n");
> +	return 0;
> +}
> +
> +/*
> + * Detach from a running M4 remote processor (IPC-only mode)
> + *
> + * This rproc detach callback performs the opposite operation to attach callback
> + * and only needs to release the mailbox, the M4 core is not stopped and will
> + * be left to continue to run its booted firmware. This callback is invoked only in
> + * IPC-only mode.
> + */
> +static int k3_m4_rproc_detach(struct rproc *rproc)
> +{
> +	struct k3_m4_rproc *kproc = rproc->priv;
> +	struct device *dev = kproc->dev;
> +
> +	mbox_free_channel(kproc->mbox);
> +	dev_info(dev, "M4 deinitialized in IPC-only mode\n");
> +	return 0;
> +}
> +
> +static const struct rproc_ops k3_m4_rproc_ops = {
> +	.start		= k3_m4_rproc_start,
> +	.stop		= k3_m4_rproc_stop,
> +	.attach		= k3_m4_rproc_attach,
> +	.detach		= k3_m4_rproc_detach,
> +	.kick		= k3_m4_rproc_kick,
> +	.da_to_va	= k3_m4_rproc_da_to_va,
> +	.get_loaded_rsc_table = k3_m4_get_loaded_rsc_table,
> +};
> +
> +static int k3_m4_rproc_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct device_node *np = dev->of_node;
> +	const struct k3_m4_rproc_dev_data *data;
> +	struct k3_m4_rproc *kproc;
> +	struct rproc *rproc;
> +	const char *fw_name;
> +	bool r_state = false;
> +	bool p_state = false;
> +	int ret = 0;
> +
> +	data = device_get_match_data(dev);
> +	if (!data)
> +		return -ENODEV;
> +
> +	ret = rproc_of_parse_firmware(dev, 0, &fw_name);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "failed to parse firmware-name property\n");
> +
> +	rproc = devm_rproc_alloc(dev, dev_name(dev), &k3_m4_rproc_ops, fw_name,
> +				 sizeof(*kproc));
> +	if (!rproc)
> +		return -ENOMEM;
> +
> +	rproc->has_iommu = false;
> +	rproc->recovery_disabled = true;
> +	if (data->uses_lreset) {
> +		rproc->ops->prepare = k3_m4_rproc_prepare;
> +		rproc->ops->unprepare = k3_m4_rproc_unprepare;
> +	}
> +	kproc = rproc->priv;
> +	kproc->rproc = rproc;
> +	kproc->dev = dev;
> +	kproc->data = data;
> +
> +	kproc->ti_sci = devm_ti_sci_get_by_phandle(dev, "ti,sci");
> +	if (IS_ERR(kproc->ti_sci))
> +		return dev_err_probe(dev, PTR_ERR(kproc->ti_sci),
> +				     "failed to get ti-sci handle\n");
> +
> +	ret = of_property_read_u32(np, "ti,sci-dev-id", &kproc->ti_sci_id);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "missing 'ti,sci-dev-id' property\n");
> +
> +	kproc->reset = devm_reset_control_get_exclusive(dev, NULL);
> +	if (IS_ERR(kproc->reset))
> +		return dev_err_probe(dev, PTR_ERR(kproc->reset), "failed to get reset\n");
> +
> +	kproc->tsp = k3_m4_rproc_of_get_tsp(dev, kproc->ti_sci);
> +	if (IS_ERR(kproc->tsp))
> +		return dev_err_probe(dev, PTR_ERR(kproc->tsp),
> +				     "failed to construct ti-sci proc control\n");
> +
> +	ret = ti_sci_proc_request(kproc->tsp);
> +	if (ret < 0)
> +		return dev_err_probe(dev, ret, "ti_sci_proc_request failed\n");
> +	ret = devm_add_action_or_reset(dev, k3_m4_release_tsp, kproc->tsp);
> +	if (ret)
> +		return ret;
> +
> +	ret = k3_m4_rproc_of_get_memories(pdev, kproc);
> +	if (ret)
> +		return ret;
> +
> +	ret = k3_m4_reserved_mem_init(kproc);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "reserved memory init failed\n");
> +
> +	ret = kproc->ti_sci->ops.dev_ops.is_on(kproc->ti_sci, kproc->ti_sci_id,
> +					       &r_state, &p_state);
> +	if (ret)
> +		return dev_err_probe(dev, ret,
> +				     "failed to get initial state, mode cannot be determined\n");
> +
> +	/* configure devices for either remoteproc or IPC-only mode */
> +	if (p_state) {
> +		dev_info(dev, "configured M4 for IPC-only mode\n");
> +		rproc->state = RPROC_DETACHED;
> +		/* override rproc ops with only required IPC-only mode ops */
> +		rproc->ops->prepare = NULL;
> +		rproc->ops->unprepare = NULL;
> +		rproc->ops->start = NULL;
> +		rproc->ops->stop = NULL;
> +		rproc->ops->attach = k3_m4_rproc_attach;
> +		rproc->ops->detach = k3_m4_rproc_detach;
> +		rproc->ops->get_loaded_rsc_table = k3_m4_get_loaded_rsc_table;
> +	} else {
> +		dev_info(dev, "configured M4 for remoteproc mode\n");
> +		/*
> +		 * ensure the M4 local reset is asserted to ensure the core
> +		 * doesn't execute bogus code in .prepare() when the module
> +		 * reset is released.
> +		 */
> +		if (data->uses_lreset) {
> +			ret = reset_control_status(kproc->reset);
> +			if (ret < 0) {
> +				return dev_err_probe(dev, ret, "failed to get reset status\n");
> +			} else if (ret == 0) {
> +				dev_warn(dev, "local reset is deasserted for device\n");
> +				k3_m4_rproc_reset(kproc);
> +			}
> +		}
> +	}
> +
> +	ret = devm_rproc_add(dev, rproc);
> +	if (ret)
> +		return dev_err_probe(dev, ret,
> +				     "failed to add register device with remoteproc core\n");
> +
> +	return 0;
> +}
> +
> +static const struct k3_m4_rproc_mem_data am64_m4_mems[] = {
> +	{ .name = "iram", .dev_addr = 0x0 },
> +	{ .name = "dram", .dev_addr = 0x30000 },
> +};
> +
> +static const struct k3_m4_rproc_dev_data am64_m4_data = {
> +	.mems = am64_m4_mems,
> +	.num_mems = ARRAY_SIZE(am64_m4_mems),
> +	.uses_lreset = true,

If this is the case, why carrying k3_m4_rproc_dev_data::uses_lreset and all the
code around it?

I am done reviewing this set.

Regards,
Mathieu

> +};
> +
> +static const struct of_device_id k3_m4_of_match[] = {
> +	{ .compatible = "ti,am64-m4fss", .data = &am64_m4_data, },
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, k3_m4_of_match);
> +
> +static struct platform_driver k3_m4_rproc_driver = {
> +	.probe	= k3_m4_rproc_probe,
> +	.driver	= {
> +		.name = "k3-m4-rproc",
> +		.of_match_table = k3_m4_of_match,
> +	},
> +};
> +module_platform_driver(k3_m4_rproc_driver);
> +
> +MODULE_AUTHOR("Hari Nagalla <hnagalla@ti.com>");
> +MODULE_DESCRIPTION("TI K3 M4 Remoteproc driver");
> +MODULE_LICENSE("GPL");
> -- 
> 2.39.2
> 

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Re: [PATCH v9 2/5] remoteproc: k3-m4: Add a remoteproc driver for M4F subsystem

[Andrew Davis]

On 5/7/24 3:36 PM, Mathieu Poirier wrote:
> On Fri, Apr 26, 2024 at 02:18:08PM -0500, Andrew Davis wrote:
>> From: Martyn Welch <martyn.welch@collabora.com>
>>
>> The AM62x and AM64x SoCs of the TI K3 family has a Cortex M4F core in
>> the MCU domain. This core is typically used for safety applications in a
>> stand alone mode. However, some application (non safety related) may
>> want to use the M4F core as a generic remote processor with IPC to the
>> host processor. The M4F core has internal IRAM and DRAM memories and are
>> exposed to the system bus for code and data loading.
>>
>> A remote processor driver is added to support this subsystem, including
>> being able to load and boot the M4F core. Loading includes to M4F
>> internal memories and predefined external code/data memories. The
>> carve outs for external contiguous memory is defined in the M4F device
>> node and should match with the external memory declarations in the M4F
>> image binary. The M4F subsystem has two resets. One reset is for the
>> entire subsystem i.e including the internal memories and the other, a
>> local reset is only for the M4F processing core. When loading the image,
>> the driver first releases the subsystem reset, loads the firmware image
>> and then releases the local reset to let the M4F processing core run.
>>
>> Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
>> Signed-off-by: Hari Nagalla <hnagalla@ti.com>
>> Signed-off-by: Andrew Davis <afd@ti.com>
>> ---
>>   drivers/remoteproc/Kconfig               |  13 +
>>   drivers/remoteproc/Makefile              |   1 +
>>   drivers/remoteproc/ti_k3_m4_remoteproc.c | 785 +++++++++++++++++++++++
>>   3 files changed, 799 insertions(+)
>>   create mode 100644 drivers/remoteproc/ti_k3_m4_remoteproc.c
>>
>> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
>> index 48845dc8fa852..1a7c0330c91a9 100644
>> --- a/drivers/remoteproc/Kconfig
>> +++ b/drivers/remoteproc/Kconfig
>> @@ -339,6 +339,19 @@ config TI_K3_DSP_REMOTEPROC
>>   	  It's safe to say N here if you're not interested in utilizing
>>   	  the DSP slave processors.
>>   
>> +config TI_K3_M4_REMOTEPROC
>> +	tristate "TI K3 M4 remoteproc support"
>> +	depends on ARCH_K3 || COMPILE_TEST
>> +	select MAILBOX
>> +	select OMAP2PLUS_MBOX
>> +	help
>> +	  Say m here to support TI's M4 remote processor subsystems
>> +	  on various TI K3 family of SoCs through the remote processor
>> +	  framework.
>> +
>> +	  It's safe to say N here if you're not interested in utilizing
>> +	  a remote processor.
>> +
>>   config TI_K3_R5_REMOTEPROC
>>   	tristate "TI K3 R5 remoteproc support"
>>   	depends on ARCH_K3
>> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
>> index 91314a9b43cef..5ff4e2fee4abd 100644
>> --- a/drivers/remoteproc/Makefile
>> +++ b/drivers/remoteproc/Makefile
>> @@ -37,5 +37,6 @@ obj-$(CONFIG_ST_REMOTEPROC)		+= st_remoteproc.o
>>   obj-$(CONFIG_ST_SLIM_REMOTEPROC)	+= st_slim_rproc.o
>>   obj-$(CONFIG_STM32_RPROC)		+= stm32_rproc.o
>>   obj-$(CONFIG_TI_K3_DSP_REMOTEPROC)	+= ti_k3_dsp_remoteproc.o
>> +obj-$(CONFIG_TI_K3_M4_REMOTEPROC)	+= ti_k3_m4_remoteproc.o
>>   obj-$(CONFIG_TI_K3_R5_REMOTEPROC)	+= ti_k3_r5_remoteproc.o
>>   obj-$(CONFIG_XLNX_R5_REMOTEPROC)	+= xlnx_r5_remoteproc.o
>> diff --git a/drivers/remoteproc/ti_k3_m4_remoteproc.c b/drivers/remoteproc/ti_k3_m4_remoteproc.c
>> new file mode 100644
>> index 0000000000000..0030e509f6b5d
>> --- /dev/null
>> +++ b/drivers/remoteproc/ti_k3_m4_remoteproc.c
>> @@ -0,0 +1,785 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * TI K3 Cortex-M4 Remote Processor(s) driver
>> + *
>> + * Copyright (C) 2021-2024 Texas Instruments Incorporated - https://www.ti.com/
>> + *	Hari Nagalla <hnagalla@ti.com>
>> + */
>> +
>> +#include <linux/io.h>
>> +#include <linux/mailbox_client.h>
>> +#include <linux/module.h>
>> +#include <linux/of_address.h>
>> +#include <linux/of_reserved_mem.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/remoteproc.h>
>> +#include <linux/reset.h>
>> +#include <linux/slab.h>
>> +
>> +#include "omap_remoteproc.h"
>> +#include "remoteproc_internal.h"
>> +#include "ti_sci_proc.h"
>> +
>> +/**
>> + * struct k3_m4_rproc_mem - internal memory structure
>> + * @cpu_addr: MPU virtual address of the memory region
>> + * @bus_addr: Bus address used to access the memory region
>> + * @dev_addr: Device address of the memory region from remote processor view
>> + * @size: Size of the memory region
>> + */
>> +struct k3_m4_rproc_mem {
>> +	void __iomem *cpu_addr;
>> +	phys_addr_t bus_addr;
>> +	u32 dev_addr;
>> +	size_t size;
>> +};
>> +
>> +/**
>> + * struct k3_m4_rproc_mem_data - memory definitions for a remote processor
>> + * @name: name for this memory entry
>> + * @dev_addr: device address for the memory entry
>> + */
>> +struct k3_m4_rproc_mem_data {
>> +	const char *name;
>> +	const u32 dev_addr;
>> +};
>> +
>> +/**
>> + * struct k3_m4_rproc_dev_data - device data structure for a remote processor
>> + * @mems: pointer to memory definitions for a remote processor
>> + * @num_mems: number of memory regions in @mems
>> + * @uses_lreset: flag to denote the need for local reset management
>> + */
>> +struct k3_m4_rproc_dev_data {
>> +	const struct k3_m4_rproc_mem_data *mems;
>> +	u32 num_mems;
>> +	bool uses_lreset;
>> +};
>> +
>> +/**
>> + * struct k3_m4_rproc - k3 remote processor driver structure
>> + * @dev: cached device pointer
>> + * @rproc: remoteproc device handle
>> + * @mem: internal memory regions data
>> + * @num_mems: number of internal memory regions
>> + * @rmem: reserved memory regions data
>> + * @num_rmems: number of reserved memory regions
>> + * @reset: reset control handle
>> + * @data: pointer to device data
>> + * @tsp: TI-SCI processor control handle
>> + * @ti_sci: TI-SCI handle
>> + * @ti_sci_id: TI-SCI device identifier
>> + * @mbox: mailbox channel handle
>> + * @client: mailbox client to request the mailbox channel
>> + */
>> +struct k3_m4_rproc {
>> +	struct device *dev;
>> +	struct rproc *rproc;
>> +	struct k3_m4_rproc_mem *mem;
>> +	int num_mems;
>> +	struct k3_m4_rproc_mem *rmem;
>> +	int num_rmems;
>> +	struct reset_control *reset;
>> +	const struct k3_m4_rproc_dev_data *data;
>> +	struct ti_sci_proc *tsp;
>> +	const struct ti_sci_handle *ti_sci;
>> +	u32 ti_sci_id;
>> +	struct mbox_chan *mbox;
>> +	struct mbox_client client;
>> +};
>> +
>> +/**
>> + * k3_m4_rproc_mbox_callback() - inbound mailbox message handler
>> + * @client: mailbox client pointer used for requesting the mailbox channel
>> + * @data: mailbox payload
>> + *
>> + * This handler is invoked by the K3 mailbox driver whenever a mailbox
>> + * message is received. Usually, the mailbox payload simply contains
>> + * the index of the virtqueue that is kicked by the remote processor,
>> + * and we let remoteproc core handle it.
>> + *
>> + * In addition to virtqueue indices, we also have some out-of-band values
>> + * that indicate different events. Those values are deliberately very
>> + * large so they don't coincide with virtqueue indices.
>> + */
>> +static void k3_m4_rproc_mbox_callback(struct mbox_client *client, void *data)
>> +{
>> +	struct k3_m4_rproc *kproc = container_of(client, struct k3_m4_rproc,
>> +						  client);
>> +	struct device *dev = kproc->rproc->dev.parent;
>> +	const char *name = kproc->rproc->name;
>> +	u32 msg = (u32)(uintptr_t)(data);
>> +
>> +	dev_dbg(dev, "mbox msg: 0x%x\n", msg);
>> +
>> +	switch (msg) {
>> +	case RP_MBOX_CRASH:
>> +		/*
>> +		 * remoteproc detected an exception, but error recovery is not
>> +		 * supported. So, just log this for now
>> +		 */
>> +		dev_err(dev, "K3 rproc %s crashed\n", name);
>> +		break;
>> +	case RP_MBOX_ECHO_REPLY:
>> +		dev_info(dev, "received echo reply from %s\n", name);
>> +		break;
>> +	default:
>> +		/* silently handle all other valid messages */
>> +		if (msg >= RP_MBOX_READY && msg < RP_MBOX_END_MSG)
>> +			return;
>> +		if (msg > kproc->rproc->max_notifyid) {
>> +			dev_dbg(dev, "dropping unknown message 0x%x", msg);
>> +			return;
>> +		}
>> +		/* msg contains the index of the triggered vring */
>> +		if (rproc_vq_interrupt(kproc->rproc, msg) == IRQ_NONE)
>> +			dev_dbg(dev, "no message was found in vqid %d\n", msg);
>> +	}
>> +}
>> +
>> +/*
>> + * Kick the remote processor to notify about pending unprocessed messages.
>> + * The vqid usage is not used and is inconsequential, as the kick is performed
>> + * through a simulated GPIO (a bit in an IPC interrupt-triggering register),
>> + * the remote processor is expected to process both its Tx and Rx virtqueues.
>> + */
>> +static void k3_m4_rproc_kick(struct rproc *rproc, int vqid)
>> +{
>> +	struct k3_m4_rproc *kproc = rproc->priv;
>> +	struct device *dev = rproc->dev.parent;
>> +	u32 msg = (u32)vqid;
>> +	int ret;
>> +
>> +	/* send the index of the triggered virtqueue in the mailbox payload */
>> +	ret = mbox_send_message(kproc->mbox, (void *)(uintptr_t)msg);
> 
> I remember discussing this but can't recall the outcome.  Still, I don't see
> why (uintptr_t) is needed here.
> 

Was discussed here: https://lkml.org/lkml/2024/3/28/974

Re-quoting my response from last time:

> Doing that in one step (u32 -> void*) causes a warning when void* is 64bit
> (cast from int to pointer of different size).

>> +	if (ret < 0)
>> +		dev_err(dev, "failed to send mailbox message, status = %d\n",
>> +			ret);
>> +}
>> +
>> +/* Put the remote processor into reset */
>> +static int k3_m4_rproc_reset(struct k3_m4_rproc *kproc)
>> +{
>> +	struct device *dev = kproc->dev;
>> +	int ret;
>> +
>> +	ret = reset_control_assert(kproc->reset);
>> +	if (ret) {
>> +		dev_err(dev, "local-reset assert failed, ret = %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	if (kproc->data->uses_lreset)
>> +		return ret;
>> +
>> +	ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
>> +						    kproc->ti_sci_id);
>> +	if (ret) {
>> +		dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
>> +		if (reset_control_deassert(kproc->reset))
>> +			dev_warn(dev, "local-reset deassert back failed\n");
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +/* Release the remote processor from reset */
>> +static int k3_m4_rproc_release(struct k3_m4_rproc *kproc)
>> +{
>> +	struct device *dev = kproc->dev;
>> +	int ret;
>> +
>> +	if (kproc->data->uses_lreset)
>> +		goto lreset;
>> +
>> +	ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
>> +						    kproc->ti_sci_id);
>> +	if (ret) {
>> +		dev_err(dev, "module-reset deassert failed, ret = %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +lreset:
>> +	ret = reset_control_deassert(kproc->reset);
>> +	if (ret) {
>> +		dev_err(dev, "local-reset deassert failed, ret = %d\n", ret);
>> +		if (kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
>> +							  kproc->ti_sci_id))
> 
> This is done unconditionally, even when dev_ops.get_device() above hasn't been
> called.
> 

Will rework to fix that, seems this is also a problem for ti_k3_dsp_remoteproc.c
from which this function was based. Will fix that too when we factor out these
common functions.

>> +			dev_warn(dev, "module-reset assert back failed\n");
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +static int k3_m4_rproc_request_mbox(struct rproc *rproc)
>> +{
>> +	struct k3_m4_rproc *kproc = rproc->priv;
>> +	struct mbox_client *client = &kproc->client;
>> +	struct device *dev = kproc->dev;
>> +	int ret;
>> +
>> +	client->dev = dev;
>> +	client->tx_done = NULL;
>> +	client->rx_callback = k3_m4_rproc_mbox_callback;
>> +	client->tx_block = false;
>> +	client->knows_txdone = false;
>> +
>> +	kproc->mbox = mbox_request_channel(client, 0);
>> +	if (IS_ERR(kproc->mbox)) {
>> +		ret = -EBUSY;
>> +		dev_err(dev, "mbox_request_channel failed: %ld\n",
>> +			PTR_ERR(kproc->mbox));
>> +		return ret;
>> +	}
>> +
>> +	/*
>> +	 * Ping the remote processor, this is only for sanity-sake for now;
>> +	 * there is no functional effect whatsoever.
>> +	 *
>> +	 * Note that the reply will _not_ arrive immediately: this message
>> +	 * will wait in the mailbox fifo until the remote processor is booted.
>> +	 */
>> +	ret = mbox_send_message(kproc->mbox, (void *)RP_MBOX_ECHO_REQUEST);
>> +	if (ret < 0) {
>> +		dev_err(dev, "mbox_send_message failed: %d\n", ret);
>> +		mbox_free_channel(kproc->mbox);
>> +		return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +/*
>> + * The M4 cores have a local reset that affects only the CPU, and a
>> + * generic module reset that powers on the device and allows the internal
>> + * memories to be accessed while the local reset is asserted. This function is
>> + * used to release the global reset on remote cores to allow loading into the
>> + * internal RAMs. The .prepare() ops is invoked by remoteproc core before any
>> + * firmware loading, and is followed by the .start() ops after loading to
>> + * actually let the remote cores to run. This callback is invoked only in
>> + * remoteproc mode.
>> + */
>> +static int k3_m4_rproc_prepare(struct rproc *rproc)
>> +{
>> +	struct k3_m4_rproc *kproc = rproc->priv;
>> +	struct device *dev = kproc->dev;
>> +	int ret;
>> +
>> +	ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
>> +						    kproc->ti_sci_id);
>> +	if (ret)
>> +		dev_err(dev, "module-reset deassert failed, cannot enable internal RAM loading, ret = %d\n",
>> +			ret);
>> +
>> +	return ret;
>> +}
>> +
>> +/*
>> + * This function implements the .unprepare() ops and performs the complimentary
>> + * operations to that of the .prepare() ops. The function is used to assert the
>> + * global reset on applicable cores. This completes the second portion of
>> + * powering down the remote core. The cores themselves are only halted in the
>> + * .stop() callback through the local reset, and the .unprepare() ops is invoked
>> + * by the remoteproc core after the remoteproc is stopped to balance the global
>> + * reset. This callback is invoked only in remoteproc mode.
>> + */
>> +static int k3_m4_rproc_unprepare(struct rproc *rproc)
>> +{
>> +	struct k3_m4_rproc *kproc = rproc->priv;
>> +	struct device *dev = kproc->dev;
>> +	int ret;
>> +
>> +	ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
>> +						    kproc->ti_sci_id);
>> +	if (ret)
>> +		dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
>> +
>> +	return ret;
>> +}
>> +
>> +/*
>> + * This function implements the .get_loaded_rsc_table() callback and is used
>> + * to provide the resource table for a booted remote processor in IPC-only
>> + * mode. The remote processor firmwares follow a design-by-contract approach
>> + * and are expected to have the resource table at the base of the DDR region
>> + * reserved for firmware usage. This provides flexibility for the remote
>> + * processor to be booted by different bootloaders that may or may not have the
>> + * ability to publish the resource table address and size through a DT
>> + * property.
>> + */
>> +static struct resource_table *k3_m4_get_loaded_rsc_table(struct rproc *rproc,
>> +							 size_t *rsc_table_sz)
>> +{
>> +	struct k3_m4_rproc *kproc = rproc->priv;
>> +	struct device *dev = kproc->dev;
>> +
>> +	if (!kproc->rmem[0].cpu_addr) {
>> +		dev_err(dev, "memory-region #1 does not exist, loaded rsc table can't be found");
>> +		return ERR_PTR(-ENOMEM);
>> +	}
>> +
>> +	/*
>> +	 * NOTE: The resource table size is currently hard-coded to a maximum
>> +	 * of 256 bytes. The most common resource table usage for K3 firmwares
>> +	 * is to only have the vdev resource entry and an optional trace entry.
>> +	 * The exact size could be computed based on resource table address, but
>> +	 * the hard-coded value suffices to support the IPC-only mode.
>> +	 */
>> +	*rsc_table_sz = 256;
>> +	return (__force struct resource_table *)kproc->rmem[0].cpu_addr;
>> +}
>> +
>> +/*
>> + * Custom function to translate a remote processor device address (internal
>> + * RAMs only) to a kernel virtual address.  The remote processors can access
>> + * their RAMs at either an internal address visible only from a remote
>> + * processor, or at the SoC-level bus address. Both these addresses need to be
>> + * looked through for translation. The translated addresses can be used either
>> + * by the remoteproc core for loading (when using kernel remoteproc loader), or
>> + * by any rpmsg bus drivers.
>> + */
>> +static void *k3_m4_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
>> +{
>> +	struct k3_m4_rproc *kproc = rproc->priv;
>> +	void __iomem *va = NULL;
>> +	phys_addr_t bus_addr;
>> +	u32 dev_addr, offset;
>> +	size_t size;
>> +	int i;
>> +
>> +	if (len == 0)
>> +		return NULL;
>> +
>> +	for (i = 0; i < kproc->num_mems; i++) {
>> +		bus_addr = kproc->mem[i].bus_addr;
>> +		dev_addr = kproc->mem[i].dev_addr;
>> +		size = kproc->mem[i].size;
>> +
>> +		/* handle M4-view addresses */
>> +		if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
>> +			offset = da - dev_addr;
>> +			va = kproc->mem[i].cpu_addr + offset;
>> +			return (__force void *)va;
>> +		}
>> +
>> +		/* handle SoC-view addresses */
>> +		if (da >= bus_addr && ((da + len) <= (bus_addr + size))) {
>> +			offset = da - bus_addr;
>> +			va = kproc->mem[i].cpu_addr + offset;
>> +			return (__force void *)va;
>> +		}
>> +	}
>> +
>> +	/* handle static DDR reserved memory regions */
>> +	for (i = 0; i < kproc->num_rmems; i++) {
>> +		dev_addr = kproc->rmem[i].dev_addr;
>> +		size = kproc->rmem[i].size;
>> +
>> +		if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
>> +			offset = da - dev_addr;
>> +			va = kproc->rmem[i].cpu_addr + offset;
>> +			return (__force void *)va;
>> +		}
>> +	}
>> +
>> +	return NULL;
>> +}
>> +
>> +static int k3_m4_rproc_of_get_memories(struct platform_device *pdev,
>> +				       struct k3_m4_rproc *kproc)
>> +{
>> +	const struct k3_m4_rproc_dev_data *data = kproc->data;
>> +	struct device *dev = &pdev->dev;
>> +	struct resource *res;
>> +	int num_mems = 0;
>> +	int i;
>> +
>> +	num_mems = kproc->data->num_mems;
>> +	kproc->mem = devm_kcalloc(kproc->dev, num_mems,
>> +				  sizeof(*kproc->mem), GFP_KERNEL);
>> +	if (!kproc->mem)
>> +		return -ENOMEM;
>> +
>> +	for (i = 0; i < num_mems; i++) {
>> +		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
>> +						   data->mems[i].name);
>> +		if (!res) {
>> +			dev_err(dev, "found no memory resource for %s\n",
>> +				data->mems[i].name);
>> +			return -EINVAL;
>> +		}
>> +		if (!devm_request_mem_region(dev, res->start,
>> +					     resource_size(res),
>> +					     dev_name(dev))) {
>> +			dev_err(dev, "could not request %s region for resource\n",
>> +				data->mems[i].name);
>> +			return -EBUSY;
>> +		}
>> +
>> +		kproc->mem[i].cpu_addr = devm_ioremap_wc(dev, res->start,
>> +							 resource_size(res));
>> +		if (!kproc->mem[i].cpu_addr) {
>> +			dev_err(dev, "failed to map %s memory\n",
>> +				data->mems[i].name);
>> +			return -ENOMEM;
>> +		}
>> +		kproc->mem[i].bus_addr = res->start;
>> +		kproc->mem[i].dev_addr = data->mems[i].dev_addr;
>> +		kproc->mem[i].size = resource_size(res);
>> +
>> +		dev_dbg(dev, "memory %8s: bus addr %pa size 0x%zx va %pK da 0x%x\n",
>> +			data->mems[i].name, &kproc->mem[i].bus_addr,
> 
> I'm pretty sure you are intrested in kproc->mem[i].bus_addr rather than
> &kproc->mem[i].bus_addr.
> 

I think this is correct as it is, the %pa format takes a "reference" to what
we are interested in, so we need to pass the address of the address :)

https://www.kernel.org/doc/Documentation/printk-formats.txt

>> +			kproc->mem[i].size, kproc->mem[i].cpu_addr,
>> +			kproc->mem[i].dev_addr);
>> +	}
>> +	kproc->num_mems = num_mems;
>> +
>> +	return 0;
>> +}
>> +
>> +static void k3_m4_rproc_dev_mem_release(void *data)
>> +{
>> +	struct device *dev = data;
>> +
>> +	of_reserved_mem_device_release(dev);
>> +}
>> +
>> +static int k3_m4_reserved_mem_init(struct k3_m4_rproc *kproc)
>> +{
>> +	struct device *dev = kproc->dev;
>> +	struct device_node *np = dev->of_node;
>> +	struct device_node *rmem_np;
>> +	struct reserved_mem *rmem;
>> +	int num_rmems;
>> +	int ret, i;
>> +
>> +	num_rmems = of_property_count_elems_of_size(np, "memory-region",
>> +						    sizeof(phandle));
>> +	if (num_rmems < 0) {
>> +		dev_err(dev, "device does not reserved memory regions (%pe)\n",
>> +			ERR_PTR(num_rmems));
> 
> Why use %pe and ERR_PTR() when function of_property_count_elems_of_size()
> returns a simple error code?
> 

Done to match the same in ti_k3_dsp_remoteproc.c but I see no good reason
for it, will fix.

>> +		return -EINVAL;
>> +	}
>> +	if (num_rmems < 2) {
>> +		dev_err(dev, "device needs at least two memory regions to be defined, num = %d\n",
>> +			num_rmems);
>> +		return -EINVAL;
>> +	}
>> +
>> +	/* use reserved memory region 0 for vring DMA allocations */
>> +	ret = of_reserved_mem_device_init_by_idx(dev, np, 0);
>> +	if (ret) {
>> +		dev_err(dev, "device cannot initialize DMA pool (%pe)\n",
>> +			ERR_PTR(ret));
> 
> Same
> 
>> +		return ret;
>> +	}
>> +	ret = devm_add_action_or_reset(dev, k3_m4_rproc_dev_mem_release, dev);
>> +	if (ret)
>> +		return ret;
>> +
>> +	num_rmems--;
>> +	kproc->rmem = devm_kcalloc(dev, num_rmems, sizeof(*kproc->rmem), GFP_KERNEL);
>> +	if (!kproc->rmem)
>> +		return -ENOMEM;
>> +
>> +	/* use remaining reserved memory regions for static carveouts */
>> +	for (i = 0; i < num_rmems; i++) {
>> +		rmem_np = of_parse_phandle(np, "memory-region", i + 1);
>> +		if (!rmem_np)
>> +			return -EINVAL;
>> +
>> +		rmem = of_reserved_mem_lookup(rmem_np);
>> +		if (!rmem) {
>> +			of_node_put(rmem_np);
>> +			return -EINVAL;
>> +		}
>> +		of_node_put(rmem_np);
>> +
>> +		kproc->rmem[i].bus_addr = rmem->base;
>> +		/* 64-bit address regions currently not supported */
>> +		kproc->rmem[i].dev_addr = (u32)rmem->base;
>> +		kproc->rmem[i].size = rmem->size;
>> +		kproc->rmem[i].cpu_addr = devm_ioremap_wc(dev, rmem->base, rmem->size);
>> +		if (!kproc->rmem[i].cpu_addr) {
>> +			dev_err(dev, "failed to map reserved memory#%d at %pa of size %pa\n",
>> +				i + 1, &rmem->base, &rmem->size);
>> +			return -ENOMEM;
>> +		}
>> +
>> +		dev_dbg(dev, "reserved memory%d: bus addr %pa size 0x%zx va %pK da 0x%x\n",
>> +			i + 1, &kproc->rmem[i].bus_addr,
>> +			kproc->rmem[i].size, kproc->rmem[i].cpu_addr,
>> +			kproc->rmem[i].dev_addr);
>> +	}
>> +	kproc->num_rmems = num_rmems;
>> +
>> +	return 0;
>> +}
>> +
>> +static struct ti_sci_proc *k3_m4_rproc_of_get_tsp(struct device *dev,
>> +						  const struct ti_sci_handle *sci)
>> +{
>> +	struct ti_sci_proc *tsp;
>> +	u32 temp[2];
>> +	int ret;
>> +
>> +	ret = of_property_read_u32_array(dev->of_node, "ti,sci-proc-ids",
>> +					 temp, 2);
>> +	if (ret < 0)
>> +		return ERR_PTR(ret);
>> +
>> +	tsp = devm_kzalloc(dev, sizeof(*tsp), GFP_KERNEL);
>> +	if (!tsp)
>> +		return ERR_PTR(-ENOMEM);
>> +
>> +	tsp->dev = dev;
>> +	tsp->sci = sci;
>> +	tsp->ops = &sci->ops.proc_ops;
>> +	tsp->proc_id = temp[0];
>> +	tsp->host_id = temp[1];
>> +
>> +	return tsp;
>> +}
>> +
>> +static void k3_m4_release_tsp(void *data)
>> +{
>> +	struct ti_sci_proc *tsp = data;
>> +
>> +	ti_sci_proc_release(tsp);
>> +}
>> +
>> +/*
>> + * Power up the M4F remote processor.
>> + *
>> + * This function will be invoked only after the firmware for this rproc
>> + * was loaded, parsed successfully, and all of its resource requirements
>> + * were met. This callback is invoked only in remoteproc mode.
>> + */
>> +static int k3_m4_rproc_start(struct rproc *rproc)
>> +{
>> +	struct k3_m4_rproc *kproc = rproc->priv;
>> +	int ret;
>> +
>> +	ret = k3_m4_rproc_request_mbox(rproc);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = k3_m4_rproc_release(kproc);
>> +	if (ret)
>> +		goto put_mbox;
>> +
>> +	return 0;
>> +
>> +put_mbox:
>> +	mbox_free_channel(kproc->mbox);
>> +	return ret;
>> +}
>> +
>> +/*
>> + * Stop the M4 remote processor.
>> + *
>> + * This function puts the M4 processor into reset, and finishes processing
>> + * of any pending messages. This callback is invoked only in remoteproc mode.
>> + */
>> +static int k3_m4_rproc_stop(struct rproc *rproc)
>> +{
>> +	struct k3_m4_rproc *kproc = rproc->priv;
>> +
>> +	mbox_free_channel(kproc->mbox);
>> +
>> +	k3_m4_rproc_reset(kproc);
>> +
>> +	return 0;
>> +}
>> +
>> +/*
>> + * Attach to a running M4 remote processor (IPC-only mode)
>> + *
>> + * This rproc attach callback only needs to request the mailbox, the remote
>> + * processor is already booted, so there is no need to issue any TI-SCI
>> + * commands to boot the M4 core. This callback is used only in IPC-only mode.
>> + */
>> +static int k3_m4_rproc_attach(struct rproc *rproc)
>> +{
>> +	struct k3_m4_rproc *kproc = rproc->priv;
>> +	struct device *dev = kproc->dev;
>> +	int ret;
>> +
>> +	ret = k3_m4_rproc_request_mbox(rproc);
>> +	if (ret)
>> +		return ret;
>> +
>> +	dev_info(dev, "M4 initialized in IPC-only mode\n");
>> +	return 0;
>> +}
>> +
>> +/*
>> + * Detach from a running M4 remote processor (IPC-only mode)
>> + *
>> + * This rproc detach callback performs the opposite operation to attach callback
>> + * and only needs to release the mailbox, the M4 core is not stopped and will
>> + * be left to continue to run its booted firmware. This callback is invoked only in
>> + * IPC-only mode.
>> + */
>> +static int k3_m4_rproc_detach(struct rproc *rproc)
>> +{
>> +	struct k3_m4_rproc *kproc = rproc->priv;
>> +	struct device *dev = kproc->dev;
>> +
>> +	mbox_free_channel(kproc->mbox);
>> +	dev_info(dev, "M4 deinitialized in IPC-only mode\n");
>> +	return 0;
>> +}
>> +
>> +static const struct rproc_ops k3_m4_rproc_ops = {
>> +	.start		= k3_m4_rproc_start,
>> +	.stop		= k3_m4_rproc_stop,
>> +	.attach		= k3_m4_rproc_attach,
>> +	.detach		= k3_m4_rproc_detach,
>> +	.kick		= k3_m4_rproc_kick,
>> +	.da_to_va	= k3_m4_rproc_da_to_va,
>> +	.get_loaded_rsc_table = k3_m4_get_loaded_rsc_table,
>> +};
>> +
>> +static int k3_m4_rproc_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	struct device_node *np = dev->of_node;
>> +	const struct k3_m4_rproc_dev_data *data;
>> +	struct k3_m4_rproc *kproc;
>> +	struct rproc *rproc;
>> +	const char *fw_name;
>> +	bool r_state = false;
>> +	bool p_state = false;
>> +	int ret = 0;
>> +
>> +	data = device_get_match_data(dev);
>> +	if (!data)
>> +		return -ENODEV;
>> +
>> +	ret = rproc_of_parse_firmware(dev, 0, &fw_name);
>> +	if (ret)
>> +		return dev_err_probe(dev, ret, "failed to parse firmware-name property\n");
>> +
>> +	rproc = devm_rproc_alloc(dev, dev_name(dev), &k3_m4_rproc_ops, fw_name,
>> +				 sizeof(*kproc));
>> +	if (!rproc)
>> +		return -ENOMEM;
>> +
>> +	rproc->has_iommu = false;
>> +	rproc->recovery_disabled = true;
>> +	if (data->uses_lreset) {
>> +		rproc->ops->prepare = k3_m4_rproc_prepare;
>> +		rproc->ops->unprepare = k3_m4_rproc_unprepare;
>> +	}
>> +	kproc = rproc->priv;
>> +	kproc->rproc = rproc;
>> +	kproc->dev = dev;
>> +	kproc->data = data;
>> +
>> +	kproc->ti_sci = devm_ti_sci_get_by_phandle(dev, "ti,sci");
>> +	if (IS_ERR(kproc->ti_sci))
>> +		return dev_err_probe(dev, PTR_ERR(kproc->ti_sci),
>> +				     "failed to get ti-sci handle\n");
>> +
>> +	ret = of_property_read_u32(np, "ti,sci-dev-id", &kproc->ti_sci_id);
>> +	if (ret)
>> +		return dev_err_probe(dev, ret, "missing 'ti,sci-dev-id' property\n");
>> +
>> +	kproc->reset = devm_reset_control_get_exclusive(dev, NULL);
>> +	if (IS_ERR(kproc->reset))
>> +		return dev_err_probe(dev, PTR_ERR(kproc->reset), "failed to get reset\n");
>> +
>> +	kproc->tsp = k3_m4_rproc_of_get_tsp(dev, kproc->ti_sci);
>> +	if (IS_ERR(kproc->tsp))
>> +		return dev_err_probe(dev, PTR_ERR(kproc->tsp),
>> +				     "failed to construct ti-sci proc control\n");
>> +
>> +	ret = ti_sci_proc_request(kproc->tsp);
>> +	if (ret < 0)
>> +		return dev_err_probe(dev, ret, "ti_sci_proc_request failed\n");
>> +	ret = devm_add_action_or_reset(dev, k3_m4_release_tsp, kproc->tsp);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = k3_m4_rproc_of_get_memories(pdev, kproc);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = k3_m4_reserved_mem_init(kproc);
>> +	if (ret)
>> +		return dev_err_probe(dev, ret, "reserved memory init failed\n");
>> +
>> +	ret = kproc->ti_sci->ops.dev_ops.is_on(kproc->ti_sci, kproc->ti_sci_id,
>> +					       &r_state, &p_state);
>> +	if (ret)
>> +		return dev_err_probe(dev, ret,
>> +				     "failed to get initial state, mode cannot be determined\n");
>> +
>> +	/* configure devices for either remoteproc or IPC-only mode */
>> +	if (p_state) {
>> +		dev_info(dev, "configured M4 for IPC-only mode\n");
>> +		rproc->state = RPROC_DETACHED;
>> +		/* override rproc ops with only required IPC-only mode ops */
>> +		rproc->ops->prepare = NULL;
>> +		rproc->ops->unprepare = NULL;
>> +		rproc->ops->start = NULL;
>> +		rproc->ops->stop = NULL;
>> +		rproc->ops->attach = k3_m4_rproc_attach;
>> +		rproc->ops->detach = k3_m4_rproc_detach;
>> +		rproc->ops->get_loaded_rsc_table = k3_m4_get_loaded_rsc_table;
>> +	} else {
>> +		dev_info(dev, "configured M4 for remoteproc mode\n");
>> +		/*
>> +		 * ensure the M4 local reset is asserted to ensure the core
>> +		 * doesn't execute bogus code in .prepare() when the module
>> +		 * reset is released.
>> +		 */
>> +		if (data->uses_lreset) {
>> +			ret = reset_control_status(kproc->reset);
>> +			if (ret < 0) {
>> +				return dev_err_probe(dev, ret, "failed to get reset status\n");
>> +			} else if (ret == 0) {
>> +				dev_warn(dev, "local reset is deasserted for device\n");
>> +				k3_m4_rproc_reset(kproc);
>> +			}
>> +		}
>> +	}
>> +
>> +	ret = devm_rproc_add(dev, rproc);
>> +	if (ret)
>> +		return dev_err_probe(dev, ret,
>> +				     "failed to add register device with remoteproc core\n");
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct k3_m4_rproc_mem_data am64_m4_mems[] = {
>> +	{ .name = "iram", .dev_addr = 0x0 },
>> +	{ .name = "dram", .dev_addr = 0x30000 },
>> +};
>> +
>> +static const struct k3_m4_rproc_dev_data am64_m4_data = {
>> +	.mems = am64_m4_mems,
>> +	.num_mems = ARRAY_SIZE(am64_m4_mems),
>> +	.uses_lreset = true,
> 
> If this is the case, why carrying k3_m4_rproc_dev_data::uses_lreset and all the
> code around it?
> 

It was to keep most of these functions consistent with k3-r5 and k3-dsp drivers
which do optionally have this local reset. For now I'll just remove it from
here.

Thanks,
Andrew

> I am done reviewing this set.
> 
> Regards,
> Mathieu
> 
>> +};
>> +
>> +static const struct of_device_id k3_m4_of_match[] = {
>> +	{ .compatible = "ti,am64-m4fss", .data = &am64_m4_data, },
>> +	{ /* sentinel */ },
>> +};
>> +MODULE_DEVICE_TABLE(of, k3_m4_of_match);
>> +
>> +static struct platform_driver k3_m4_rproc_driver = {
>> +	.probe	= k3_m4_rproc_probe,
>> +	.driver	= {
>> +		.name = "k3-m4-rproc",
>> +		.of_match_table = k3_m4_of_match,
>> +	},
>> +};
>> +module_platform_driver(k3_m4_rproc_driver);
>> +
>> +MODULE_AUTHOR("Hari Nagalla <hnagalla@ti.com>");
>> +MODULE_DESCRIPTION("TI K3 M4 Remoteproc driver");
>> +MODULE_LICENSE("GPL");
>> -- 
>> 2.39.2
>>

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Re: [PATCH v9 2/5] remoteproc: k3-m4: Add a remoteproc driver for M4F subsystem

[Mathieu Poirier]

On Wed, 8 May 2024 at 10:54, Andrew Davis <afd@ti.com> wrote:
>
> On 5/7/24 3:36 PM, Mathieu Poirier wrote:
> > On Fri, Apr 26, 2024 at 02:18:08PM -0500, Andrew Davis wrote:
> >> From: Martyn Welch <martyn.welch@collabora.com>
> >>
> >> The AM62x and AM64x SoCs of the TI K3 family has a Cortex M4F core in
> >> the MCU domain. This core is typically used for safety applications in a
> >> stand alone mode. However, some application (non safety related) may
> >> want to use the M4F core as a generic remote processor with IPC to the
> >> host processor. The M4F core has internal IRAM and DRAM memories and are
> >> exposed to the system bus for code and data loading.
> >>
> >> A remote processor driver is added to support this subsystem, including
> >> being able to load and boot the M4F core. Loading includes to M4F
> >> internal memories and predefined external code/data memories. The
> >> carve outs for external contiguous memory is defined in the M4F device
> >> node and should match with the external memory declarations in the M4F
> >> image binary. The M4F subsystem has two resets. One reset is for the
> >> entire subsystem i.e including the internal memories and the other, a
> >> local reset is only for the M4F processing core. When loading the image,
> >> the driver first releases the subsystem reset, loads the firmware image
> >> and then releases the local reset to let the M4F processing core run.
> >>
> >> Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
> >> Signed-off-by: Hari Nagalla <hnagalla@ti.com>
> >> Signed-off-by: Andrew Davis <afd@ti.com>
> >> ---
> >>   drivers/remoteproc/Kconfig               |  13 +
> >>   drivers/remoteproc/Makefile              |   1 +
> >>   drivers/remoteproc/ti_k3_m4_remoteproc.c | 785 +++++++++++++++++++++++
> >>   3 files changed, 799 insertions(+)
> >>   create mode 100644 drivers/remoteproc/ti_k3_m4_remoteproc.c
> >>
> >> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> >> index 48845dc8fa852..1a7c0330c91a9 100644
> >> --- a/drivers/remoteproc/Kconfig
> >> +++ b/drivers/remoteproc/Kconfig
> >> @@ -339,6 +339,19 @@ config TI_K3_DSP_REMOTEPROC
> >>        It's safe to say N here if you're not interested in utilizing
> >>        the DSP slave processors.
> >>
> >> +config TI_K3_M4_REMOTEPROC
> >> +    tristate "TI K3 M4 remoteproc support"
> >> +    depends on ARCH_K3 || COMPILE_TEST
> >> +    select MAILBOX
> >> +    select OMAP2PLUS_MBOX
> >> +    help
> >> +      Say m here to support TI's M4 remote processor subsystems
> >> +      on various TI K3 family of SoCs through the remote processor
> >> +      framework.
> >> +
> >> +      It's safe to say N here if you're not interested in utilizing
> >> +      a remote processor.
> >> +
> >>   config TI_K3_R5_REMOTEPROC
> >>      tristate "TI K3 R5 remoteproc support"
> >>      depends on ARCH_K3
> >> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
> >> index 91314a9b43cef..5ff4e2fee4abd 100644
> >> --- a/drivers/remoteproc/Makefile
> >> +++ b/drivers/remoteproc/Makefile
> >> @@ -37,5 +37,6 @@ obj-$(CONFIG_ST_REMOTEPROC)                += st_remoteproc.o
> >>   obj-$(CONFIG_ST_SLIM_REMOTEPROC)   += st_slim_rproc.o
> >>   obj-$(CONFIG_STM32_RPROC)          += stm32_rproc.o
> >>   obj-$(CONFIG_TI_K3_DSP_REMOTEPROC) += ti_k3_dsp_remoteproc.o
> >> +obj-$(CONFIG_TI_K3_M4_REMOTEPROC)   += ti_k3_m4_remoteproc.o
> >>   obj-$(CONFIG_TI_K3_R5_REMOTEPROC)  += ti_k3_r5_remoteproc.o
> >>   obj-$(CONFIG_XLNX_R5_REMOTEPROC)   += xlnx_r5_remoteproc.o
> >> diff --git a/drivers/remoteproc/ti_k3_m4_remoteproc.c b/drivers/remoteproc/ti_k3_m4_remoteproc.c
> >> new file mode 100644
> >> index 0000000000000..0030e509f6b5d
> >> --- /dev/null
> >> +++ b/drivers/remoteproc/ti_k3_m4_remoteproc.c
> >> @@ -0,0 +1,785 @@
> >> +// SPDX-License-Identifier: GPL-2.0-only
> >> +/*
> >> + * TI K3 Cortex-M4 Remote Processor(s) driver
> >> + *
> >> + * Copyright (C) 2021-2024 Texas Instruments Incorporated - https://www.ti.com/
> >> + *  Hari Nagalla <hnagalla@ti.com>
> >> + */
> >> +
> >> +#include <linux/io.h>
> >> +#include <linux/mailbox_client.h>
> >> +#include <linux/module.h>
> >> +#include <linux/of_address.h>
> >> +#include <linux/of_reserved_mem.h>
> >> +#include <linux/platform_device.h>
> >> +#include <linux/remoteproc.h>
> >> +#include <linux/reset.h>
> >> +#include <linux/slab.h>
> >> +
> >> +#include "omap_remoteproc.h"
> >> +#include "remoteproc_internal.h"
> >> +#include "ti_sci_proc.h"
> >> +
> >> +/**
> >> + * struct k3_m4_rproc_mem - internal memory structure
> >> + * @cpu_addr: MPU virtual address of the memory region
> >> + * @bus_addr: Bus address used to access the memory region
> >> + * @dev_addr: Device address of the memory region from remote processor view
> >> + * @size: Size of the memory region
> >> + */
> >> +struct k3_m4_rproc_mem {
> >> +    void __iomem *cpu_addr;
> >> +    phys_addr_t bus_addr;
> >> +    u32 dev_addr;
> >> +    size_t size;
> >> +};
> >> +
> >> +/**
> >> + * struct k3_m4_rproc_mem_data - memory definitions for a remote processor
> >> + * @name: name for this memory entry
> >> + * @dev_addr: device address for the memory entry
> >> + */
> >> +struct k3_m4_rproc_mem_data {
> >> +    const char *name;
> >> +    const u32 dev_addr;
> >> +};
> >> +
> >> +/**
> >> + * struct k3_m4_rproc_dev_data - device data structure for a remote processor
> >> + * @mems: pointer to memory definitions for a remote processor
> >> + * @num_mems: number of memory regions in @mems
> >> + * @uses_lreset: flag to denote the need for local reset management
> >> + */
> >> +struct k3_m4_rproc_dev_data {
> >> +    const struct k3_m4_rproc_mem_data *mems;
> >> +    u32 num_mems;
> >> +    bool uses_lreset;
> >> +};
> >> +
> >> +/**
> >> + * struct k3_m4_rproc - k3 remote processor driver structure
> >> + * @dev: cached device pointer
> >> + * @rproc: remoteproc device handle
> >> + * @mem: internal memory regions data
> >> + * @num_mems: number of internal memory regions
> >> + * @rmem: reserved memory regions data
> >> + * @num_rmems: number of reserved memory regions
> >> + * @reset: reset control handle
> >> + * @data: pointer to device data
> >> + * @tsp: TI-SCI processor control handle
> >> + * @ti_sci: TI-SCI handle
> >> + * @ti_sci_id: TI-SCI device identifier
> >> + * @mbox: mailbox channel handle
> >> + * @client: mailbox client to request the mailbox channel
> >> + */
> >> +struct k3_m4_rproc {
> >> +    struct device *dev;
> >> +    struct rproc *rproc;
> >> +    struct k3_m4_rproc_mem *mem;
> >> +    int num_mems;
> >> +    struct k3_m4_rproc_mem *rmem;
> >> +    int num_rmems;
> >> +    struct reset_control *reset;
> >> +    const struct k3_m4_rproc_dev_data *data;
> >> +    struct ti_sci_proc *tsp;
> >> +    const struct ti_sci_handle *ti_sci;
> >> +    u32 ti_sci_id;
> >> +    struct mbox_chan *mbox;
> >> +    struct mbox_client client;
> >> +};
> >> +
> >> +/**
> >> + * k3_m4_rproc_mbox_callback() - inbound mailbox message handler
> >> + * @client: mailbox client pointer used for requesting the mailbox channel
> >> + * @data: mailbox payload
> >> + *
> >> + * This handler is invoked by the K3 mailbox driver whenever a mailbox
> >> + * message is received. Usually, the mailbox payload simply contains
> >> + * the index of the virtqueue that is kicked by the remote processor,
> >> + * and we let remoteproc core handle it.
> >> + *
> >> + * In addition to virtqueue indices, we also have some out-of-band values
> >> + * that indicate different events. Those values are deliberately very
> >> + * large so they don't coincide with virtqueue indices.
> >> + */
> >> +static void k3_m4_rproc_mbox_callback(struct mbox_client *client, void *data)
> >> +{
> >> +    struct k3_m4_rproc *kproc = container_of(client, struct k3_m4_rproc,
> >> +                                              client);
> >> +    struct device *dev = kproc->rproc->dev.parent;
> >> +    const char *name = kproc->rproc->name;
> >> +    u32 msg = (u32)(uintptr_t)(data);
> >> +
> >> +    dev_dbg(dev, "mbox msg: 0x%x\n", msg);
> >> +
> >> +    switch (msg) {
> >> +    case RP_MBOX_CRASH:
> >> +            /*
> >> +             * remoteproc detected an exception, but error recovery is not
> >> +             * supported. So, just log this for now
> >> +             */
> >> +            dev_err(dev, "K3 rproc %s crashed\n", name);
> >> +            break;
> >> +    case RP_MBOX_ECHO_REPLY:
> >> +            dev_info(dev, "received echo reply from %s\n", name);
> >> +            break;
> >> +    default:
> >> +            /* silently handle all other valid messages */
> >> +            if (msg >= RP_MBOX_READY && msg < RP_MBOX_END_MSG)
> >> +                    return;
> >> +            if (msg > kproc->rproc->max_notifyid) {
> >> +                    dev_dbg(dev, "dropping unknown message 0x%x", msg);
> >> +                    return;
> >> +            }
> >> +            /* msg contains the index of the triggered vring */
> >> +            if (rproc_vq_interrupt(kproc->rproc, msg) == IRQ_NONE)
> >> +                    dev_dbg(dev, "no message was found in vqid %d\n", msg);
> >> +    }
> >> +}
> >> +
> >> +/*
> >> + * Kick the remote processor to notify about pending unprocessed messages.
> >> + * The vqid usage is not used and is inconsequential, as the kick is performed
> >> + * through a simulated GPIO (a bit in an IPC interrupt-triggering register),
> >> + * the remote processor is expected to process both its Tx and Rx virtqueues.
> >> + */
> >> +static void k3_m4_rproc_kick(struct rproc *rproc, int vqid)
> >> +{
> >> +    struct k3_m4_rproc *kproc = rproc->priv;
> >> +    struct device *dev = rproc->dev.parent;
> >> +    u32 msg = (u32)vqid;
> >> +    int ret;
> >> +
> >> +    /* send the index of the triggered virtqueue in the mailbox payload */
> >> +    ret = mbox_send_message(kproc->mbox, (void *)(uintptr_t)msg);
> >
> > I remember discussing this but can't recall the outcome.  Still, I don't see
> > why (uintptr_t) is needed here.
> >
>
> Was discussed here: https://lkml.org/lkml/2024/3/28/974
>
> Re-quoting my response from last time:
>
> > Doing that in one step (u32 -> void*) causes a warning when void* is 64bit
> > (cast from int to pointer of different size).
>

I remember now - please add a comment that supports using the syntax.
That way we avoid receiving patches and once again having to review
this.

> >> +    if (ret < 0)
> >> +            dev_err(dev, "failed to send mailbox message, status = %d\n",
> >> +                    ret);
> >> +}
> >> +
> >> +/* Put the remote processor into reset */
> >> +static int k3_m4_rproc_reset(struct k3_m4_rproc *kproc)
> >> +{
> >> +    struct device *dev = kproc->dev;
> >> +    int ret;
> >> +
> >> +    ret = reset_control_assert(kproc->reset);
> >> +    if (ret) {
> >> +            dev_err(dev, "local-reset assert failed, ret = %d\n", ret);
> >> +            return ret;
> >> +    }
> >> +
> >> +    if (kproc->data->uses_lreset)
> >> +            return ret;
> >> +
> >> +    ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
> >> +                                                kproc->ti_sci_id);
> >> +    if (ret) {
> >> +            dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
> >> +            if (reset_control_deassert(kproc->reset))
> >> +                    dev_warn(dev, "local-reset deassert back failed\n");
> >> +    }
> >> +
> >> +    return ret;
> >> +}
> >> +
> >> +/* Release the remote processor from reset */
> >> +static int k3_m4_rproc_release(struct k3_m4_rproc *kproc)
> >> +{
> >> +    struct device *dev = kproc->dev;
> >> +    int ret;
> >> +
> >> +    if (kproc->data->uses_lreset)
> >> +            goto lreset;
> >> +
> >> +    ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
> >> +                                                kproc->ti_sci_id);
> >> +    if (ret) {
> >> +            dev_err(dev, "module-reset deassert failed, ret = %d\n", ret);
> >> +            return ret;
> >> +    }
> >> +
> >> +lreset:
> >> +    ret = reset_control_deassert(kproc->reset);
> >> +    if (ret) {
> >> +            dev_err(dev, "local-reset deassert failed, ret = %d\n", ret);
> >> +            if (kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
> >> +                                                      kproc->ti_sci_id))
> >
> > This is done unconditionally, even when dev_ops.get_device() above hasn't been
> > called.
> >
>
> Will rework to fix that, seems this is also a problem for ti_k3_dsp_remoteproc.c
> from which this function was based. Will fix that too when we factor out these
> common functions.
>
> >> +                    dev_warn(dev, "module-reset assert back failed\n");
> >> +    }
> >> +
> >> +    return ret;
> >> +}
> >> +
> >> +static int k3_m4_rproc_request_mbox(struct rproc *rproc)
> >> +{
> >> +    struct k3_m4_rproc *kproc = rproc->priv;
> >> +    struct mbox_client *client = &kproc->client;
> >> +    struct device *dev = kproc->dev;
> >> +    int ret;
> >> +
> >> +    client->dev = dev;
> >> +    client->tx_done = NULL;
> >> +    client->rx_callback = k3_m4_rproc_mbox_callback;
> >> +    client->tx_block = false;
> >> +    client->knows_txdone = false;
> >> +
> >> +    kproc->mbox = mbox_request_channel(client, 0);
> >> +    if (IS_ERR(kproc->mbox)) {
> >> +            ret = -EBUSY;
> >> +            dev_err(dev, "mbox_request_channel failed: %ld\n",
> >> +                    PTR_ERR(kproc->mbox));
> >> +            return ret;
> >> +    }
> >> +
> >> +    /*
> >> +     * Ping the remote processor, this is only for sanity-sake for now;
> >> +     * there is no functional effect whatsoever.
> >> +     *
> >> +     * Note that the reply will _not_ arrive immediately: this message
> >> +     * will wait in the mailbox fifo until the remote processor is booted.
> >> +     */
> >> +    ret = mbox_send_message(kproc->mbox, (void *)RP_MBOX_ECHO_REQUEST);
> >> +    if (ret < 0) {
> >> +            dev_err(dev, "mbox_send_message failed: %d\n", ret);
> >> +            mbox_free_channel(kproc->mbox);
> >> +            return ret;
> >> +    }
> >> +
> >> +    return 0;
> >> +}
> >> +
> >> +/*
> >> + * The M4 cores have a local reset that affects only the CPU, and a
> >> + * generic module reset that powers on the device and allows the internal
> >> + * memories to be accessed while the local reset is asserted. This function is
> >> + * used to release the global reset on remote cores to allow loading into the
> >> + * internal RAMs. The .prepare() ops is invoked by remoteproc core before any
> >> + * firmware loading, and is followed by the .start() ops after loading to
> >> + * actually let the remote cores to run. This callback is invoked only in
> >> + * remoteproc mode.
> >> + */
> >> +static int k3_m4_rproc_prepare(struct rproc *rproc)
> >> +{
> >> +    struct k3_m4_rproc *kproc = rproc->priv;
> >> +    struct device *dev = kproc->dev;
> >> +    int ret;
> >> +
> >> +    ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
> >> +                                                kproc->ti_sci_id);
> >> +    if (ret)
> >> +            dev_err(dev, "module-reset deassert failed, cannot enable internal RAM loading, ret = %d\n",
> >> +                    ret);
> >> +
> >> +    return ret;
> >> +}
> >> +
> >> +/*
> >> + * This function implements the .unprepare() ops and performs the complimentary
> >> + * operations to that of the .prepare() ops. The function is used to assert the
> >> + * global reset on applicable cores. This completes the second portion of
> >> + * powering down the remote core. The cores themselves are only halted in the
> >> + * .stop() callback through the local reset, and the .unprepare() ops is invoked
> >> + * by the remoteproc core after the remoteproc is stopped to balance the global
> >> + * reset. This callback is invoked only in remoteproc mode.
> >> + */
> >> +static int k3_m4_rproc_unprepare(struct rproc *rproc)
> >> +{
> >> +    struct k3_m4_rproc *kproc = rproc->priv;
> >> +    struct device *dev = kproc->dev;
> >> +    int ret;
> >> +
> >> +    ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
> >> +                                                kproc->ti_sci_id);
> >> +    if (ret)
> >> +            dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
> >> +
> >> +    return ret;
> >> +}
> >> +
> >> +/*
> >> + * This function implements the .get_loaded_rsc_table() callback and is used
> >> + * to provide the resource table for a booted remote processor in IPC-only
> >> + * mode. The remote processor firmwares follow a design-by-contract approach
> >> + * and are expected to have the resource table at the base of the DDR region
> >> + * reserved for firmware usage. This provides flexibility for the remote
> >> + * processor to be booted by different bootloaders that may or may not have the
> >> + * ability to publish the resource table address and size through a DT
> >> + * property.
> >> + */
> >> +static struct resource_table *k3_m4_get_loaded_rsc_table(struct rproc *rproc,
> >> +                                                     size_t *rsc_table_sz)
> >> +{
> >> +    struct k3_m4_rproc *kproc = rproc->priv;
> >> +    struct device *dev = kproc->dev;
> >> +
> >> +    if (!kproc->rmem[0].cpu_addr) {
> >> +            dev_err(dev, "memory-region #1 does not exist, loaded rsc table can't be found");
> >> +            return ERR_PTR(-ENOMEM);
> >> +    }
> >> +
> >> +    /*
> >> +     * NOTE: The resource table size is currently hard-coded to a maximum
> >> +     * of 256 bytes. The most common resource table usage for K3 firmwares
> >> +     * is to only have the vdev resource entry and an optional trace entry.
> >> +     * The exact size could be computed based on resource table address, but
> >> +     * the hard-coded value suffices to support the IPC-only mode.
> >> +     */
> >> +    *rsc_table_sz = 256;
> >> +    return (__force struct resource_table *)kproc->rmem[0].cpu_addr;
> >> +}
> >> +
> >> +/*
> >> + * Custom function to translate a remote processor device address (internal
> >> + * RAMs only) to a kernel virtual address.  The remote processors can access
> >> + * their RAMs at either an internal address visible only from a remote
> >> + * processor, or at the SoC-level bus address. Both these addresses need to be
> >> + * looked through for translation. The translated addresses can be used either
> >> + * by the remoteproc core for loading (when using kernel remoteproc loader), or
> >> + * by any rpmsg bus drivers.
> >> + */
> >> +static void *k3_m4_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
> >> +{
> >> +    struct k3_m4_rproc *kproc = rproc->priv;
> >> +    void __iomem *va = NULL;
> >> +    phys_addr_t bus_addr;
> >> +    u32 dev_addr, offset;
> >> +    size_t size;
> >> +    int i;
> >> +
> >> +    if (len == 0)
> >> +            return NULL;
> >> +
> >> +    for (i = 0; i < kproc->num_mems; i++) {
> >> +            bus_addr = kproc->mem[i].bus_addr;
> >> +            dev_addr = kproc->mem[i].dev_addr;
> >> +            size = kproc->mem[i].size;
> >> +
> >> +            /* handle M4-view addresses */
> >> +            if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
> >> +                    offset = da - dev_addr;
> >> +                    va = kproc->mem[i].cpu_addr + offset;
> >> +                    return (__force void *)va;
> >> +            }
> >> +
> >> +            /* handle SoC-view addresses */
> >> +            if (da >= bus_addr && ((da + len) <= (bus_addr + size))) {
> >> +                    offset = da - bus_addr;
> >> +                    va = kproc->mem[i].cpu_addr + offset;
> >> +                    return (__force void *)va;
> >> +            }
> >> +    }
> >> +
> >> +    /* handle static DDR reserved memory regions */
> >> +    for (i = 0; i < kproc->num_rmems; i++) {
> >> +            dev_addr = kproc->rmem[i].dev_addr;
> >> +            size = kproc->rmem[i].size;
> >> +
> >> +            if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
> >> +                    offset = da - dev_addr;
> >> +                    va = kproc->rmem[i].cpu_addr + offset;
> >> +                    return (__force void *)va;
> >> +            }
> >> +    }
> >> +
> >> +    return NULL;
> >> +}
> >> +
> >> +static int k3_m4_rproc_of_get_memories(struct platform_device *pdev,
> >> +                                   struct k3_m4_rproc *kproc)
> >> +{
> >> +    const struct k3_m4_rproc_dev_data *data = kproc->data;
> >> +    struct device *dev = &pdev->dev;
> >> +    struct resource *res;
> >> +    int num_mems = 0;
> >> +    int i;
> >> +
> >> +    num_mems = kproc->data->num_mems;
> >> +    kproc->mem = devm_kcalloc(kproc->dev, num_mems,
> >> +                              sizeof(*kproc->mem), GFP_KERNEL);
> >> +    if (!kproc->mem)
> >> +            return -ENOMEM;
> >> +
> >> +    for (i = 0; i < num_mems; i++) {
> >> +            res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> >> +                                               data->mems[i].name);
> >> +            if (!res) {
> >> +                    dev_err(dev, "found no memory resource for %s\n",
> >> +                            data->mems[i].name);
> >> +                    return -EINVAL;
> >> +            }
> >> +            if (!devm_request_mem_region(dev, res->start,
> >> +                                         resource_size(res),
> >> +                                         dev_name(dev))) {
> >> +                    dev_err(dev, "could not request %s region for resource\n",
> >> +                            data->mems[i].name);
> >> +                    return -EBUSY;
> >> +            }
> >> +
> >> +            kproc->mem[i].cpu_addr = devm_ioremap_wc(dev, res->start,
> >> +                                                     resource_size(res));
> >> +            if (!kproc->mem[i].cpu_addr) {
> >> +                    dev_err(dev, "failed to map %s memory\n",
> >> +                            data->mems[i].name);
> >> +                    return -ENOMEM;
> >> +            }
> >> +            kproc->mem[i].bus_addr = res->start;
> >> +            kproc->mem[i].dev_addr = data->mems[i].dev_addr;
> >> +            kproc->mem[i].size = resource_size(res);
> >> +
> >> +            dev_dbg(dev, "memory %8s: bus addr %pa size 0x%zx va %pK da 0x%x\n",
> >> +                    data->mems[i].name, &kproc->mem[i].bus_addr,
> >
> > I'm pretty sure you are intrested in kproc->mem[i].bus_addr rather than
> > &kproc->mem[i].bus_addr.
> >
>
> I think this is correct as it is, the %pa format takes a "reference" to what
> we are interested in, so we need to pass the address of the address :)
>

You are correct.

> https://www.kernel.org/doc/Documentation/printk-formats.txt
>
> >> +                    kproc->mem[i].size, kproc->mem[i].cpu_addr,
> >> +                    kproc->mem[i].dev_addr);
> >> +    }
> >> +    kproc->num_mems = num_mems;
> >> +
> >> +    return 0;
> >> +}
> >> +
> >> +static void k3_m4_rproc_dev_mem_release(void *data)
> >> +{
> >> +    struct device *dev = data;
> >> +
> >> +    of_reserved_mem_device_release(dev);
> >> +}
> >> +
> >> +static int k3_m4_reserved_mem_init(struct k3_m4_rproc *kproc)
> >> +{
> >> +    struct device *dev = kproc->dev;
> >> +    struct device_node *np = dev->of_node;
> >> +    struct device_node *rmem_np;
> >> +    struct reserved_mem *rmem;
> >> +    int num_rmems;
> >> +    int ret, i;
> >> +
> >> +    num_rmems = of_property_count_elems_of_size(np, "memory-region",
> >> +                                                sizeof(phandle));
> >> +    if (num_rmems < 0) {
> >> +            dev_err(dev, "device does not reserved memory regions (%pe)\n",
> >> +                    ERR_PTR(num_rmems));
> >
> > Why use %pe and ERR_PTR() when function of_property_count_elems_of_size()
> > returns a simple error code?
> >
>
> Done to match the same in ti_k3_dsp_remoteproc.c but I see no good reason
> for it, will fix.
>
> >> +            return -EINVAL;
> >> +    }
> >> +    if (num_rmems < 2) {
> >> +            dev_err(dev, "device needs at least two memory regions to be defined, num = %d\n",
> >> +                    num_rmems);
> >> +            return -EINVAL;
> >> +    }
> >> +
> >> +    /* use reserved memory region 0 for vring DMA allocations */
> >> +    ret = of_reserved_mem_device_init_by_idx(dev, np, 0);
> >> +    if (ret) {
> >> +            dev_err(dev, "device cannot initialize DMA pool (%pe)\n",
> >> +                    ERR_PTR(ret));
> >
> > Same
> >
> >> +            return ret;
> >> +    }
> >> +    ret = devm_add_action_or_reset(dev, k3_m4_rproc_dev_mem_release, dev);
> >> +    if (ret)
> >> +            return ret;
> >> +
> >> +    num_rmems--;
> >> +    kproc->rmem = devm_kcalloc(dev, num_rmems, sizeof(*kproc->rmem), GFP_KERNEL);
> >> +    if (!kproc->rmem)
> >> +            return -ENOMEM;
> >> +
> >> +    /* use remaining reserved memory regions for static carveouts */
> >> +    for (i = 0; i < num_rmems; i++) {
> >> +            rmem_np = of_parse_phandle(np, "memory-region", i + 1);
> >> +            if (!rmem_np)
> >> +                    return -EINVAL;
> >> +
> >> +            rmem = of_reserved_mem_lookup(rmem_np);
> >> +            if (!rmem) {
> >> +                    of_node_put(rmem_np);
> >> +                    return -EINVAL;
> >> +            }
> >> +            of_node_put(rmem_np);
> >> +
> >> +            kproc->rmem[i].bus_addr = rmem->base;
> >> +            /* 64-bit address regions currently not supported */
> >> +            kproc->rmem[i].dev_addr = (u32)rmem->base;
> >> +            kproc->rmem[i].size = rmem->size;
> >> +            kproc->rmem[i].cpu_addr = devm_ioremap_wc(dev, rmem->base, rmem->size);
> >> +            if (!kproc->rmem[i].cpu_addr) {
> >> +                    dev_err(dev, "failed to map reserved memory#%d at %pa of size %pa\n",
> >> +                            i + 1, &rmem->base, &rmem->size);
> >> +                    return -ENOMEM;
> >> +            }
> >> +
> >> +            dev_dbg(dev, "reserved memory%d: bus addr %pa size 0x%zx va %pK da 0x%x\n",
> >> +                    i + 1, &kproc->rmem[i].bus_addr,
> >> +                    kproc->rmem[i].size, kproc->rmem[i].cpu_addr,
> >> +                    kproc->rmem[i].dev_addr);
> >> +    }
> >> +    kproc->num_rmems = num_rmems;
> >> +
> >> +    return 0;
> >> +}
> >> +
> >> +static struct ti_sci_proc *k3_m4_rproc_of_get_tsp(struct device *dev,
> >> +                                              const struct ti_sci_handle *sci)
> >> +{
> >> +    struct ti_sci_proc *tsp;
> >> +    u32 temp[2];
> >> +    int ret;
> >> +
> >> +    ret = of_property_read_u32_array(dev->of_node, "ti,sci-proc-ids",
> >> +                                     temp, 2);
> >> +    if (ret < 0)
> >> +            return ERR_PTR(ret);
> >> +
> >> +    tsp = devm_kzalloc(dev, sizeof(*tsp), GFP_KERNEL);
> >> +    if (!tsp)
> >> +            return ERR_PTR(-ENOMEM);
> >> +
> >> +    tsp->dev = dev;
> >> +    tsp->sci = sci;
> >> +    tsp->ops = &sci->ops.proc_ops;
> >> +    tsp->proc_id = temp[0];
> >> +    tsp->host_id = temp[1];
> >> +
> >> +    return tsp;
> >> +}
> >> +
> >> +static void k3_m4_release_tsp(void *data)
> >> +{
> >> +    struct ti_sci_proc *tsp = data;
> >> +
> >> +    ti_sci_proc_release(tsp);
> >> +}
> >> +
> >> +/*
> >> + * Power up the M4F remote processor.
> >> + *
> >> + * This function will be invoked only after the firmware for this rproc
> >> + * was loaded, parsed successfully, and all of its resource requirements
> >> + * were met. This callback is invoked only in remoteproc mode.
> >> + */
> >> +static int k3_m4_rproc_start(struct rproc *rproc)
> >> +{
> >> +    struct k3_m4_rproc *kproc = rproc->priv;
> >> +    int ret;
> >> +
> >> +    ret = k3_m4_rproc_request_mbox(rproc);
> >> +    if (ret)
> >> +            return ret;
> >> +
> >> +    ret = k3_m4_rproc_release(kproc);
> >> +    if (ret)
> >> +            goto put_mbox;
> >> +
> >> +    return 0;
> >> +
> >> +put_mbox:
> >> +    mbox_free_channel(kproc->mbox);
> >> +    return ret;
> >> +}
> >> +
> >> +/*
> >> + * Stop the M4 remote processor.
> >> + *
> >> + * This function puts the M4 processor into reset, and finishes processing
> >> + * of any pending messages. This callback is invoked only in remoteproc mode.
> >> + */
> >> +static int k3_m4_rproc_stop(struct rproc *rproc)
> >> +{
> >> +    struct k3_m4_rproc *kproc = rproc->priv;
> >> +
> >> +    mbox_free_channel(kproc->mbox);
> >> +
> >> +    k3_m4_rproc_reset(kproc);
> >> +
> >> +    return 0;
> >> +}
> >> +
> >> +/*
> >> + * Attach to a running M4 remote processor (IPC-only mode)
> >> + *
> >> + * This rproc attach callback only needs to request the mailbox, the remote
> >> + * processor is already booted, so there is no need to issue any TI-SCI
> >> + * commands to boot the M4 core. This callback is used only in IPC-only mode.
> >> + */
> >> +static int k3_m4_rproc_attach(struct rproc *rproc)
> >> +{
> >> +    struct k3_m4_rproc *kproc = rproc->priv;
> >> +    struct device *dev = kproc->dev;
> >> +    int ret;
> >> +
> >> +    ret = k3_m4_rproc_request_mbox(rproc);
> >> +    if (ret)
> >> +            return ret;
> >> +
> >> +    dev_info(dev, "M4 initialized in IPC-only mode\n");
> >> +    return 0;
> >> +}
> >> +
> >> +/*
> >> + * Detach from a running M4 remote processor (IPC-only mode)
> >> + *
> >> + * This rproc detach callback performs the opposite operation to attach callback
> >> + * and only needs to release the mailbox, the M4 core is not stopped and will
> >> + * be left to continue to run its booted firmware. This callback is invoked only in
> >> + * IPC-only mode.
> >> + */
> >> +static int k3_m4_rproc_detach(struct rproc *rproc)
> >> +{
> >> +    struct k3_m4_rproc *kproc = rproc->priv;
> >> +    struct device *dev = kproc->dev;
> >> +
> >> +    mbox_free_channel(kproc->mbox);
> >> +    dev_info(dev, "M4 deinitialized in IPC-only mode\n");
> >> +    return 0;
> >> +}
> >> +
> >> +static const struct rproc_ops k3_m4_rproc_ops = {
> >> +    .start          = k3_m4_rproc_start,
> >> +    .stop           = k3_m4_rproc_stop,
> >> +    .attach         = k3_m4_rproc_attach,
> >> +    .detach         = k3_m4_rproc_detach,
> >> +    .kick           = k3_m4_rproc_kick,
> >> +    .da_to_va       = k3_m4_rproc_da_to_va,
> >> +    .get_loaded_rsc_table = k3_m4_get_loaded_rsc_table,
> >> +};
> >> +
> >> +static int k3_m4_rproc_probe(struct platform_device *pdev)
> >> +{
> >> +    struct device *dev = &pdev->dev;
> >> +    struct device_node *np = dev->of_node;
> >> +    const struct k3_m4_rproc_dev_data *data;
> >> +    struct k3_m4_rproc *kproc;
> >> +    struct rproc *rproc;
> >> +    const char *fw_name;
> >> +    bool r_state = false;
> >> +    bool p_state = false;
> >> +    int ret = 0;
> >> +
> >> +    data = device_get_match_data(dev);
> >> +    if (!data)
> >> +            return -ENODEV;
> >> +
> >> +    ret = rproc_of_parse_firmware(dev, 0, &fw_name);
> >> +    if (ret)
> >> +            return dev_err_probe(dev, ret, "failed to parse firmware-name property\n");
> >> +
> >> +    rproc = devm_rproc_alloc(dev, dev_name(dev), &k3_m4_rproc_ops, fw_name,
> >> +                             sizeof(*kproc));
> >> +    if (!rproc)
> >> +            return -ENOMEM;
> >> +
> >> +    rproc->has_iommu = false;
> >> +    rproc->recovery_disabled = true;
> >> +    if (data->uses_lreset) {
> >> +            rproc->ops->prepare = k3_m4_rproc_prepare;
> >> +            rproc->ops->unprepare = k3_m4_rproc_unprepare;
> >> +    }
> >> +    kproc = rproc->priv;
> >> +    kproc->rproc = rproc;
> >> +    kproc->dev = dev;
> >> +    kproc->data = data;
> >> +
> >> +    kproc->ti_sci = devm_ti_sci_get_by_phandle(dev, "ti,sci");
> >> +    if (IS_ERR(kproc->ti_sci))
> >> +            return dev_err_probe(dev, PTR_ERR(kproc->ti_sci),
> >> +                                 "failed to get ti-sci handle\n");
> >> +
> >> +    ret = of_property_read_u32(np, "ti,sci-dev-id", &kproc->ti_sci_id);
> >> +    if (ret)
> >> +            return dev_err_probe(dev, ret, "missing 'ti,sci-dev-id' property\n");
> >> +
> >> +    kproc->reset = devm_reset_control_get_exclusive(dev, NULL);
> >> +    if (IS_ERR(kproc->reset))
> >> +            return dev_err_probe(dev, PTR_ERR(kproc->reset), "failed to get reset\n");
> >> +
> >> +    kproc->tsp = k3_m4_rproc_of_get_tsp(dev, kproc->ti_sci);
> >> +    if (IS_ERR(kproc->tsp))
> >> +            return dev_err_probe(dev, PTR_ERR(kproc->tsp),
> >> +                                 "failed to construct ti-sci proc control\n");
> >> +
> >> +    ret = ti_sci_proc_request(kproc->tsp);
> >> +    if (ret < 0)
> >> +            return dev_err_probe(dev, ret, "ti_sci_proc_request failed\n");
> >> +    ret = devm_add_action_or_reset(dev, k3_m4_release_tsp, kproc->tsp);
> >> +    if (ret)
> >> +            return ret;
> >> +
> >> +    ret = k3_m4_rproc_of_get_memories(pdev, kproc);
> >> +    if (ret)
> >> +            return ret;
> >> +
> >> +    ret = k3_m4_reserved_mem_init(kproc);
> >> +    if (ret)
> >> +            return dev_err_probe(dev, ret, "reserved memory init failed\n");
> >> +
> >> +    ret = kproc->ti_sci->ops.dev_ops.is_on(kproc->ti_sci, kproc->ti_sci_id,
> >> +                                           &r_state, &p_state);
> >> +    if (ret)
> >> +            return dev_err_probe(dev, ret,
> >> +                                 "failed to get initial state, mode cannot be determined\n");
> >> +
> >> +    /* configure devices for either remoteproc or IPC-only mode */
> >> +    if (p_state) {
> >> +            dev_info(dev, "configured M4 for IPC-only mode\n");
> >> +            rproc->state = RPROC_DETACHED;
> >> +            /* override rproc ops with only required IPC-only mode ops */
> >> +            rproc->ops->prepare = NULL;
> >> +            rproc->ops->unprepare = NULL;
> >> +            rproc->ops->start = NULL;
> >> +            rproc->ops->stop = NULL;
> >> +            rproc->ops->attach = k3_m4_rproc_attach;
> >> +            rproc->ops->detach = k3_m4_rproc_detach;
> >> +            rproc->ops->get_loaded_rsc_table = k3_m4_get_loaded_rsc_table;
> >> +    } else {
> >> +            dev_info(dev, "configured M4 for remoteproc mode\n");
> >> +            /*
> >> +             * ensure the M4 local reset is asserted to ensure the core
> >> +             * doesn't execute bogus code in .prepare() when the module
> >> +             * reset is released.
> >> +             */
> >> +            if (data->uses_lreset) {
> >> +                    ret = reset_control_status(kproc->reset);
> >> +                    if (ret < 0) {
> >> +                            return dev_err_probe(dev, ret, "failed to get reset status\n");
> >> +                    } else if (ret == 0) {
> >> +                            dev_warn(dev, "local reset is deasserted for device\n");
> >> +                            k3_m4_rproc_reset(kproc);
> >> +                    }
> >> +            }
> >> +    }
> >> +
> >> +    ret = devm_rproc_add(dev, rproc);
> >> +    if (ret)
> >> +            return dev_err_probe(dev, ret,
> >> +                                 "failed to add register device with remoteproc core\n");
> >> +
> >> +    return 0;
> >> +}
> >> +
> >> +static const struct k3_m4_rproc_mem_data am64_m4_mems[] = {
> >> +    { .name = "iram", .dev_addr = 0x0 },
> >> +    { .name = "dram", .dev_addr = 0x30000 },
> >> +};
> >> +
> >> +static const struct k3_m4_rproc_dev_data am64_m4_data = {
> >> +    .mems = am64_m4_mems,
> >> +    .num_mems = ARRAY_SIZE(am64_m4_mems),
> >> +    .uses_lreset = true,
> >
> > If this is the case, why carrying k3_m4_rproc_dev_data::uses_lreset and all the
> > code around it?
> >
>
> It was to keep most of these functions consistent with k3-r5 and k3-dsp drivers
> which do optionally have this local reset. For now I'll just remove it from
> here.
>
> Thanks,
> Andrew
>
> > I am done reviewing this set.
> >
> > Regards,
> > Mathieu
> >
> >> +};
> >> +
> >> +static const struct of_device_id k3_m4_of_match[] = {
> >> +    { .compatible = "ti,am64-m4fss", .data = &am64_m4_data, },
> >> +    { /* sentinel */ },
> >> +};
> >> +MODULE_DEVICE_TABLE(of, k3_m4_of_match);
> >> +
> >> +static struct platform_driver k3_m4_rproc_driver = {
> >> +    .probe  = k3_m4_rproc_probe,
> >> +    .driver = {
> >> +            .name = "k3-m4-rproc",
> >> +            .of_match_table = k3_m4_of_match,
> >> +    },
> >> +};
> >> +module_platform_driver(k3_m4_rproc_driver);
> >> +
> >> +MODULE_AUTHOR("Hari Nagalla <hnagalla@ti.com>");
> >> +MODULE_DESCRIPTION("TI K3 M4 Remoteproc driver");
> >> +MODULE_LICENSE("GPL");
> >> --
> >> 2.39.2
> >>

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Re: [PATCH v9 2/5] remoteproc: k3-m4: Add a remoteproc driver for M4F subsystem

[Andrew Davis]

On 5/9/24 10:32 AM, Mathieu Poirier wrote:
> On Wed, 8 May 2024 at 10:54, Andrew Davis <afd@ti.com> wrote:
>>
>> On 5/7/24 3:36 PM, Mathieu Poirier wrote:
>>> On Fri, Apr 26, 2024 at 02:18:08PM -0500, Andrew Davis wrote:
>>>> From: Martyn Welch <martyn.welch@collabora.com>
>>>>
>>>> The AM62x and AM64x SoCs of the TI K3 family has a Cortex M4F core in
>>>> the MCU domain. This core is typically used for safety applications in a
>>>> stand alone mode. However, some application (non safety related) may
>>>> want to use the M4F core as a generic remote processor with IPC to the
>>>> host processor. The M4F core has internal IRAM and DRAM memories and are
>>>> exposed to the system bus for code and data loading.
>>>>
>>>> A remote processor driver is added to support this subsystem, including
>>>> being able to load and boot the M4F core. Loading includes to M4F
>>>> internal memories and predefined external code/data memories. The
>>>> carve outs for external contiguous memory is defined in the M4F device
>>>> node and should match with the external memory declarations in the M4F
>>>> image binary. The M4F subsystem has two resets. One reset is for the
>>>> entire subsystem i.e including the internal memories and the other, a
>>>> local reset is only for the M4F processing core. When loading the image,
>>>> the driver first releases the subsystem reset, loads the firmware image
>>>> and then releases the local reset to let the M4F processing core run.
>>>>
>>>> Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
>>>> Signed-off-by: Hari Nagalla <hnagalla@ti.com>
>>>> Signed-off-by: Andrew Davis <afd@ti.com>
>>>> ---
>>>>    drivers/remoteproc/Kconfig               |  13 +
>>>>    drivers/remoteproc/Makefile              |   1 +
>>>>    drivers/remoteproc/ti_k3_m4_remoteproc.c | 785 +++++++++++++++++++++++
>>>>    3 files changed, 799 insertions(+)
>>>>    create mode 100644 drivers/remoteproc/ti_k3_m4_remoteproc.c
>>>>
>>>> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
>>>> index 48845dc8fa852..1a7c0330c91a9 100644
>>>> --- a/drivers/remoteproc/Kconfig
>>>> +++ b/drivers/remoteproc/Kconfig
>>>> @@ -339,6 +339,19 @@ config TI_K3_DSP_REMOTEPROC
>>>>         It's safe to say N here if you're not interested in utilizing
>>>>         the DSP slave processors.
>>>>
>>>> +config TI_K3_M4_REMOTEPROC
>>>> +    tristate "TI K3 M4 remoteproc support"
>>>> +    depends on ARCH_K3 || COMPILE_TEST
>>>> +    select MAILBOX
>>>> +    select OMAP2PLUS_MBOX
>>>> +    help
>>>> +      Say m here to support TI's M4 remote processor subsystems
>>>> +      on various TI K3 family of SoCs through the remote processor
>>>> +      framework.
>>>> +
>>>> +      It's safe to say N here if you're not interested in utilizing
>>>> +      a remote processor.
>>>> +
>>>>    config TI_K3_R5_REMOTEPROC
>>>>       tristate "TI K3 R5 remoteproc support"
>>>>       depends on ARCH_K3
>>>> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
>>>> index 91314a9b43cef..5ff4e2fee4abd 100644
>>>> --- a/drivers/remoteproc/Makefile
>>>> +++ b/drivers/remoteproc/Makefile
>>>> @@ -37,5 +37,6 @@ obj-$(CONFIG_ST_REMOTEPROC)                += st_remoteproc.o
>>>>    obj-$(CONFIG_ST_SLIM_REMOTEPROC)   += st_slim_rproc.o
>>>>    obj-$(CONFIG_STM32_RPROC)          += stm32_rproc.o
>>>>    obj-$(CONFIG_TI_K3_DSP_REMOTEPROC) += ti_k3_dsp_remoteproc.o
>>>> +obj-$(CONFIG_TI_K3_M4_REMOTEPROC)   += ti_k3_m4_remoteproc.o
>>>>    obj-$(CONFIG_TI_K3_R5_REMOTEPROC)  += ti_k3_r5_remoteproc.o
>>>>    obj-$(CONFIG_XLNX_R5_REMOTEPROC)   += xlnx_r5_remoteproc.o
>>>> diff --git a/drivers/remoteproc/ti_k3_m4_remoteproc.c b/drivers/remoteproc/ti_k3_m4_remoteproc.c
>>>> new file mode 100644
>>>> index 0000000000000..0030e509f6b5d
>>>> --- /dev/null
>>>> +++ b/drivers/remoteproc/ti_k3_m4_remoteproc.c
>>>> @@ -0,0 +1,785 @@
>>>> +// SPDX-License-Identifier: GPL-2.0-only
>>>> +/*
>>>> + * TI K3 Cortex-M4 Remote Processor(s) driver
>>>> + *
>>>> + * Copyright (C) 2021-2024 Texas Instruments Incorporated - https://www.ti.com/
>>>> + *  Hari Nagalla <hnagalla@ti.com>
>>>> + */
>>>> +
>>>> +#include <linux/io.h>
>>>> +#include <linux/mailbox_client.h>
>>>> +#include <linux/module.h>
>>>> +#include <linux/of_address.h>
>>>> +#include <linux/of_reserved_mem.h>
>>>> +#include <linux/platform_device.h>
>>>> +#include <linux/remoteproc.h>
>>>> +#include <linux/reset.h>
>>>> +#include <linux/slab.h>
>>>> +
>>>> +#include "omap_remoteproc.h"
>>>> +#include "remoteproc_internal.h"
>>>> +#include "ti_sci_proc.h"
>>>> +
>>>> +/**
>>>> + * struct k3_m4_rproc_mem - internal memory structure
>>>> + * @cpu_addr: MPU virtual address of the memory region
>>>> + * @bus_addr: Bus address used to access the memory region
>>>> + * @dev_addr: Device address of the memory region from remote processor view
>>>> + * @size: Size of the memory region
>>>> + */
>>>> +struct k3_m4_rproc_mem {
>>>> +    void __iomem *cpu_addr;
>>>> +    phys_addr_t bus_addr;
>>>> +    u32 dev_addr;
>>>> +    size_t size;
>>>> +};
>>>> +
>>>> +/**
>>>> + * struct k3_m4_rproc_mem_data - memory definitions for a remote processor
>>>> + * @name: name for this memory entry
>>>> + * @dev_addr: device address for the memory entry
>>>> + */
>>>> +struct k3_m4_rproc_mem_data {
>>>> +    const char *name;
>>>> +    const u32 dev_addr;
>>>> +};
>>>> +
>>>> +/**
>>>> + * struct k3_m4_rproc_dev_data - device data structure for a remote processor
>>>> + * @mems: pointer to memory definitions for a remote processor
>>>> + * @num_mems: number of memory regions in @mems
>>>> + * @uses_lreset: flag to denote the need for local reset management
>>>> + */
>>>> +struct k3_m4_rproc_dev_data {
>>>> +    const struct k3_m4_rproc_mem_data *mems;
>>>> +    u32 num_mems;
>>>> +    bool uses_lreset;
>>>> +};
>>>> +
>>>> +/**
>>>> + * struct k3_m4_rproc - k3 remote processor driver structure
>>>> + * @dev: cached device pointer
>>>> + * @rproc: remoteproc device handle
>>>> + * @mem: internal memory regions data
>>>> + * @num_mems: number of internal memory regions
>>>> + * @rmem: reserved memory regions data
>>>> + * @num_rmems: number of reserved memory regions
>>>> + * @reset: reset control handle
>>>> + * @data: pointer to device data
>>>> + * @tsp: TI-SCI processor control handle
>>>> + * @ti_sci: TI-SCI handle
>>>> + * @ti_sci_id: TI-SCI device identifier
>>>> + * @mbox: mailbox channel handle
>>>> + * @client: mailbox client to request the mailbox channel
>>>> + */
>>>> +struct k3_m4_rproc {
>>>> +    struct device *dev;
>>>> +    struct rproc *rproc;
>>>> +    struct k3_m4_rproc_mem *mem;
>>>> +    int num_mems;
>>>> +    struct k3_m4_rproc_mem *rmem;
>>>> +    int num_rmems;
>>>> +    struct reset_control *reset;
>>>> +    const struct k3_m4_rproc_dev_data *data;
>>>> +    struct ti_sci_proc *tsp;
>>>> +    const struct ti_sci_handle *ti_sci;
>>>> +    u32 ti_sci_id;
>>>> +    struct mbox_chan *mbox;
>>>> +    struct mbox_client client;
>>>> +};
>>>> +
>>>> +/**
>>>> + * k3_m4_rproc_mbox_callback() - inbound mailbox message handler
>>>> + * @client: mailbox client pointer used for requesting the mailbox channel
>>>> + * @data: mailbox payload
>>>> + *
>>>> + * This handler is invoked by the K3 mailbox driver whenever a mailbox
>>>> + * message is received. Usually, the mailbox payload simply contains
>>>> + * the index of the virtqueue that is kicked by the remote processor,
>>>> + * and we let remoteproc core handle it.
>>>> + *
>>>> + * In addition to virtqueue indices, we also have some out-of-band values
>>>> + * that indicate different events. Those values are deliberately very
>>>> + * large so they don't coincide with virtqueue indices.
>>>> + */
>>>> +static void k3_m4_rproc_mbox_callback(struct mbox_client *client, void *data)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = container_of(client, struct k3_m4_rproc,
>>>> +                                              client);
>>>> +    struct device *dev = kproc->rproc->dev.parent;
>>>> +    const char *name = kproc->rproc->name;
>>>> +    u32 msg = (u32)(uintptr_t)(data);
>>>> +
>>>> +    dev_dbg(dev, "mbox msg: 0x%x\n", msg);
>>>> +
>>>> +    switch (msg) {
>>>> +    case RP_MBOX_CRASH:
>>>> +            /*
>>>> +             * remoteproc detected an exception, but error recovery is not
>>>> +             * supported. So, just log this for now
>>>> +             */
>>>> +            dev_err(dev, "K3 rproc %s crashed\n", name);
>>>> +            break;
>>>> +    case RP_MBOX_ECHO_REPLY:
>>>> +            dev_info(dev, "received echo reply from %s\n", name);
>>>> +            break;
>>>> +    default:
>>>> +            /* silently handle all other valid messages */
>>>> +            if (msg >= RP_MBOX_READY && msg < RP_MBOX_END_MSG)
>>>> +                    return;
>>>> +            if (msg > kproc->rproc->max_notifyid) {
>>>> +                    dev_dbg(dev, "dropping unknown message 0x%x", msg);
>>>> +                    return;
>>>> +            }
>>>> +            /* msg contains the index of the triggered vring */
>>>> +            if (rproc_vq_interrupt(kproc->rproc, msg) == IRQ_NONE)
>>>> +                    dev_dbg(dev, "no message was found in vqid %d\n", msg);
>>>> +    }
>>>> +}
>>>> +
>>>> +/*
>>>> + * Kick the remote processor to notify about pending unprocessed messages.
>>>> + * The vqid usage is not used and is inconsequential, as the kick is performed
>>>> + * through a simulated GPIO (a bit in an IPC interrupt-triggering register),
>>>> + * the remote processor is expected to process both its Tx and Rx virtqueues.
>>>> + */
>>>> +static void k3_m4_rproc_kick(struct rproc *rproc, int vqid)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = rproc->priv;
>>>> +    struct device *dev = rproc->dev.parent;
>>>> +    u32 msg = (u32)vqid;
>>>> +    int ret;
>>>> +
>>>> +    /* send the index of the triggered virtqueue in the mailbox payload */
>>>> +    ret = mbox_send_message(kproc->mbox, (void *)(uintptr_t)msg);
>>>
>>> I remember discussing this but can't recall the outcome.  Still, I don't see
>>> why (uintptr_t) is needed here.
>>>
>>
>> Was discussed here: https://lkml.org/lkml/2024/3/28/974
>>
>> Re-quoting my response from last time:
>>
>>> Doing that in one step (u32 -> void*) causes a warning when void* is 64bit
>>> (cast from int to pointer of different size).
>>
> 
> I remember now - please add a comment that supports using the syntax.
> That way we avoid receiving patches and once again having to review
> this.
> 

Sure, will add a comment.

>>>> +    if (ret < 0)
>>>> +            dev_err(dev, "failed to send mailbox message, status = %d\n",
>>>> +                    ret);
>>>> +}
>>>> +
>>>> +/* Put the remote processor into reset */
>>>> +static int k3_m4_rproc_reset(struct k3_m4_rproc *kproc)
>>>> +{
>>>> +    struct device *dev = kproc->dev;
>>>> +    int ret;
>>>> +
>>>> +    ret = reset_control_assert(kproc->reset);
>>>> +    if (ret) {
>>>> +            dev_err(dev, "local-reset assert failed, ret = %d\n", ret);
>>>> +            return ret;
>>>> +    }
>>>> +
>>>> +    if (kproc->data->uses_lreset)
>>>> +            return ret;
>>>> +
>>>> +    ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
>>>> +                                                kproc->ti_sci_id);
>>>> +    if (ret) {
>>>> +            dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
>>>> +            if (reset_control_deassert(kproc->reset))
>>>> +                    dev_warn(dev, "local-reset deassert back failed\n");
>>>> +    }
>>>> +
>>>> +    return ret;
>>>> +}
>>>> +
>>>> +/* Release the remote processor from reset */
>>>> +static int k3_m4_rproc_release(struct k3_m4_rproc *kproc)
>>>> +{
>>>> +    struct device *dev = kproc->dev;
>>>> +    int ret;
>>>> +
>>>> +    if (kproc->data->uses_lreset)
>>>> +            goto lreset;
>>>> +
>>>> +    ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
>>>> +                                                kproc->ti_sci_id);
>>>> +    if (ret) {
>>>> +            dev_err(dev, "module-reset deassert failed, ret = %d\n", ret);
>>>> +            return ret;
>>>> +    }
>>>> +
>>>> +lreset:
>>>> +    ret = reset_control_deassert(kproc->reset);
>>>> +    if (ret) {
>>>> +            dev_err(dev, "local-reset deassert failed, ret = %d\n", ret);
>>>> +            if (kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
>>>> +                                                      kproc->ti_sci_id))
>>>
>>> This is done unconditionally, even when dev_ops.get_device() above hasn't been
>>> called.
>>>
>>
>> Will rework to fix that, seems this is also a problem for ti_k3_dsp_remoteproc.c
>> from which this function was based. Will fix that too when we factor out these
>> common functions.
>>
>>>> +                    dev_warn(dev, "module-reset assert back failed\n");
>>>> +    }
>>>> +
>>>> +    return ret;
>>>> +}
>>>> +
>>>> +static int k3_m4_rproc_request_mbox(struct rproc *rproc)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = rproc->priv;
>>>> +    struct mbox_client *client = &kproc->client;
>>>> +    struct device *dev = kproc->dev;
>>>> +    int ret;
>>>> +
>>>> +    client->dev = dev;
>>>> +    client->tx_done = NULL;
>>>> +    client->rx_callback = k3_m4_rproc_mbox_callback;
>>>> +    client->tx_block = false;
>>>> +    client->knows_txdone = false;
>>>> +
>>>> +    kproc->mbox = mbox_request_channel(client, 0);
>>>> +    if (IS_ERR(kproc->mbox)) {
>>>> +            ret = -EBUSY;
>>>> +            dev_err(dev, "mbox_request_channel failed: %ld\n",
>>>> +                    PTR_ERR(kproc->mbox));
>>>> +            return ret;
>>>> +    }
>>>> +
>>>> +    /*
>>>> +     * Ping the remote processor, this is only for sanity-sake for now;
>>>> +     * there is no functional effect whatsoever.
>>>> +     *
>>>> +     * Note that the reply will _not_ arrive immediately: this message
>>>> +     * will wait in the mailbox fifo until the remote processor is booted.
>>>> +     */
>>>> +    ret = mbox_send_message(kproc->mbox, (void *)RP_MBOX_ECHO_REQUEST);
>>>> +    if (ret < 0) {
>>>> +            dev_err(dev, "mbox_send_message failed: %d\n", ret);
>>>> +            mbox_free_channel(kproc->mbox);
>>>> +            return ret;
>>>> +    }
>>>> +
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +/*
>>>> + * The M4 cores have a local reset that affects only the CPU, and a
>>>> + * generic module reset that powers on the device and allows the internal
>>>> + * memories to be accessed while the local reset is asserted. This function is
>>>> + * used to release the global reset on remote cores to allow loading into the
>>>> + * internal RAMs. The .prepare() ops is invoked by remoteproc core before any
>>>> + * firmware loading, and is followed by the .start() ops after loading to
>>>> + * actually let the remote cores to run. This callback is invoked only in
>>>> + * remoteproc mode.
>>>> + */
>>>> +static int k3_m4_rproc_prepare(struct rproc *rproc)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = rproc->priv;
>>>> +    struct device *dev = kproc->dev;
>>>> +    int ret;
>>>> +
>>>> +    ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
>>>> +                                                kproc->ti_sci_id);
>>>> +    if (ret)
>>>> +            dev_err(dev, "module-reset deassert failed, cannot enable internal RAM loading, ret = %d\n",
>>>> +                    ret);
>>>> +
>>>> +    return ret;
>>>> +}
>>>> +
>>>> +/*
>>>> + * This function implements the .unprepare() ops and performs the complimentary
>>>> + * operations to that of the .prepare() ops. The function is used to assert the
>>>> + * global reset on applicable cores. This completes the second portion of
>>>> + * powering down the remote core. The cores themselves are only halted in the
>>>> + * .stop() callback through the local reset, and the .unprepare() ops is invoked
>>>> + * by the remoteproc core after the remoteproc is stopped to balance the global
>>>> + * reset. This callback is invoked only in remoteproc mode.
>>>> + */
>>>> +static int k3_m4_rproc_unprepare(struct rproc *rproc)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = rproc->priv;
>>>> +    struct device *dev = kproc->dev;
>>>> +    int ret;
>>>> +
>>>> +    ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
>>>> +                                                kproc->ti_sci_id);
>>>> +    if (ret)
>>>> +            dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
>>>> +
>>>> +    return ret;
>>>> +}
>>>> +
>>>> +/*
>>>> + * This function implements the .get_loaded_rsc_table() callback and is used
>>>> + * to provide the resource table for a booted remote processor in IPC-only
>>>> + * mode. The remote processor firmwares follow a design-by-contract approach
>>>> + * and are expected to have the resource table at the base of the DDR region
>>>> + * reserved for firmware usage. This provides flexibility for the remote
>>>> + * processor to be booted by different bootloaders that may or may not have the
>>>> + * ability to publish the resource table address and size through a DT
>>>> + * property.
>>>> + */
>>>> +static struct resource_table *k3_m4_get_loaded_rsc_table(struct rproc *rproc,
>>>> +                                                     size_t *rsc_table_sz)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = rproc->priv;
>>>> +    struct device *dev = kproc->dev;
>>>> +
>>>> +    if (!kproc->rmem[0].cpu_addr) {
>>>> +            dev_err(dev, "memory-region #1 does not exist, loaded rsc table can't be found");
>>>> +            return ERR_PTR(-ENOMEM);
>>>> +    }
>>>> +
>>>> +    /*
>>>> +     * NOTE: The resource table size is currently hard-coded to a maximum
>>>> +     * of 256 bytes. The most common resource table usage for K3 firmwares
>>>> +     * is to only have the vdev resource entry and an optional trace entry.
>>>> +     * The exact size could be computed based on resource table address, but
>>>> +     * the hard-coded value suffices to support the IPC-only mode.
>>>> +     */
>>>> +    *rsc_table_sz = 256;
>>>> +    return (__force struct resource_table *)kproc->rmem[0].cpu_addr;
>>>> +}
>>>> +
>>>> +/*
>>>> + * Custom function to translate a remote processor device address (internal
>>>> + * RAMs only) to a kernel virtual address.  The remote processors can access
>>>> + * their RAMs at either an internal address visible only from a remote
>>>> + * processor, or at the SoC-level bus address. Both these addresses need to be
>>>> + * looked through for translation. The translated addresses can be used either
>>>> + * by the remoteproc core for loading (when using kernel remoteproc loader), or
>>>> + * by any rpmsg bus drivers.
>>>> + */
>>>> +static void *k3_m4_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = rproc->priv;
>>>> +    void __iomem *va = NULL;
>>>> +    phys_addr_t bus_addr;
>>>> +    u32 dev_addr, offset;
>>>> +    size_t size;
>>>> +    int i;
>>>> +
>>>> +    if (len == 0)
>>>> +            return NULL;
>>>> +
>>>> +    for (i = 0; i < kproc->num_mems; i++) {
>>>> +            bus_addr = kproc->mem[i].bus_addr;
>>>> +            dev_addr = kproc->mem[i].dev_addr;
>>>> +            size = kproc->mem[i].size;
>>>> +
>>>> +            /* handle M4-view addresses */
>>>> +            if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
>>>> +                    offset = da - dev_addr;
>>>> +                    va = kproc->mem[i].cpu_addr + offset;
>>>> +                    return (__force void *)va;
>>>> +            }
>>>> +
>>>> +            /* handle SoC-view addresses */
>>>> +            if (da >= bus_addr && ((da + len) <= (bus_addr + size))) {
>>>> +                    offset = da - bus_addr;
>>>> +                    va = kproc->mem[i].cpu_addr + offset;
>>>> +                    return (__force void *)va;
>>>> +            }
>>>> +    }
>>>> +
>>>> +    /* handle static DDR reserved memory regions */
>>>> +    for (i = 0; i < kproc->num_rmems; i++) {
>>>> +            dev_addr = kproc->rmem[i].dev_addr;
>>>> +            size = kproc->rmem[i].size;
>>>> +
>>>> +            if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
>>>> +                    offset = da - dev_addr;
>>>> +                    va = kproc->rmem[i].cpu_addr + offset;
>>>> +                    return (__force void *)va;
>>>> +            }
>>>> +    }
>>>> +
>>>> +    return NULL;
>>>> +}
>>>> +
>>>> +static int k3_m4_rproc_of_get_memories(struct platform_device *pdev,
>>>> +                                   struct k3_m4_rproc *kproc)
>>>> +{
>>>> +    const struct k3_m4_rproc_dev_data *data = kproc->data;
>>>> +    struct device *dev = &pdev->dev;
>>>> +    struct resource *res;
>>>> +    int num_mems = 0;
>>>> +    int i;
>>>> +
>>>> +    num_mems = kproc->data->num_mems;
>>>> +    kproc->mem = devm_kcalloc(kproc->dev, num_mems,
>>>> +                              sizeof(*kproc->mem), GFP_KERNEL);
>>>> +    if (!kproc->mem)
>>>> +            return -ENOMEM;
>>>> +
>>>> +    for (i = 0; i < num_mems; i++) {
>>>> +            res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
>>>> +                                               data->mems[i].name);
>>>> +            if (!res) {
>>>> +                    dev_err(dev, "found no memory resource for %s\n",
>>>> +                            data->mems[i].name);
>>>> +                    return -EINVAL;
>>>> +            }
>>>> +            if (!devm_request_mem_region(dev, res->start,
>>>> +                                         resource_size(res),
>>>> +                                         dev_name(dev))) {
>>>> +                    dev_err(dev, "could not request %s region for resource\n",
>>>> +                            data->mems[i].name);
>>>> +                    return -EBUSY;
>>>> +            }
>>>> +
>>>> +            kproc->mem[i].cpu_addr = devm_ioremap_wc(dev, res->start,
>>>> +                                                     resource_size(res));
>>>> +            if (!kproc->mem[i].cpu_addr) {
>>>> +                    dev_err(dev, "failed to map %s memory\n",
>>>> +                            data->mems[i].name);
>>>> +                    return -ENOMEM;
>>>> +            }
>>>> +            kproc->mem[i].bus_addr = res->start;
>>>> +            kproc->mem[i].dev_addr = data->mems[i].dev_addr;
>>>> +            kproc->mem[i].size = resource_size(res);
>>>> +
>>>> +            dev_dbg(dev, "memory %8s: bus addr %pa size 0x%zx va %pK da 0x%x\n",
>>>> +                    data->mems[i].name, &kproc->mem[i].bus_addr,
>>>
>>> I'm pretty sure you are intrested in kproc->mem[i].bus_addr rather than
>>> &kproc->mem[i].bus_addr.
>>>
>>
>> I think this is correct as it is, the %pa format takes a "reference" to what
>> we are interested in, so we need to pass the address of the address :)
>>
> 
> You are correct.
> 
>> https://www.kernel.org/doc/Documentation/printk-formats.txt
>>
>>>> +                    kproc->mem[i].size, kproc->mem[i].cpu_addr,
>>>> +                    kproc->mem[i].dev_addr);
>>>> +    }
>>>> +    kproc->num_mems = num_mems;
>>>> +
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +static void k3_m4_rproc_dev_mem_release(void *data)
>>>> +{
>>>> +    struct device *dev = data;
>>>> +
>>>> +    of_reserved_mem_device_release(dev);
>>>> +}
>>>> +
>>>> +static int k3_m4_reserved_mem_init(struct k3_m4_rproc *kproc)
>>>> +{
>>>> +    struct device *dev = kproc->dev;
>>>> +    struct device_node *np = dev->of_node;
>>>> +    struct device_node *rmem_np;
>>>> +    struct reserved_mem *rmem;
>>>> +    int num_rmems;
>>>> +    int ret, i;
>>>> +
>>>> +    num_rmems = of_property_count_elems_of_size(np, "memory-region",
>>>> +                                                sizeof(phandle));
>>>> +    if (num_rmems < 0) {
>>>> +            dev_err(dev, "device does not reserved memory regions (%pe)\n",
>>>> +                    ERR_PTR(num_rmems));
>>>
>>> Why use %pe and ERR_PTR() when function of_property_count_elems_of_size()
>>> returns a simple error code?
>>>
>>
>> Done to match the same in ti_k3_dsp_remoteproc.c but I see no good reason
>> for it, will fix.
>>
>>>> +            return -EINVAL;
>>>> +    }
>>>> +    if (num_rmems < 2) {
>>>> +            dev_err(dev, "device needs at least two memory regions to be defined, num = %d\n",
>>>> +                    num_rmems);
>>>> +            return -EINVAL;
>>>> +    }
>>>> +
>>>> +    /* use reserved memory region 0 for vring DMA allocations */
>>>> +    ret = of_reserved_mem_device_init_by_idx(dev, np, 0);
>>>> +    if (ret) {
>>>> +            dev_err(dev, "device cannot initialize DMA pool (%pe)\n",
>>>> +                    ERR_PTR(ret));
>>>
>>> Same
>>>
>>>> +            return ret;
>>>> +    }
>>>> +    ret = devm_add_action_or_reset(dev, k3_m4_rproc_dev_mem_release, dev);
>>>> +    if (ret)
>>>> +            return ret;
>>>> +
>>>> +    num_rmems--;
>>>> +    kproc->rmem = devm_kcalloc(dev, num_rmems, sizeof(*kproc->rmem), GFP_KERNEL);
>>>> +    if (!kproc->rmem)
>>>> +            return -ENOMEM;
>>>> +
>>>> +    /* use remaining reserved memory regions for static carveouts */
>>>> +    for (i = 0; i < num_rmems; i++) {
>>>> +            rmem_np = of_parse_phandle(np, "memory-region", i + 1);
>>>> +            if (!rmem_np)
>>>> +                    return -EINVAL;
>>>> +
>>>> +            rmem = of_reserved_mem_lookup(rmem_np);
>>>> +            if (!rmem) {
>>>> +                    of_node_put(rmem_np);
>>>> +                    return -EINVAL;
>>>> +            }
>>>> +            of_node_put(rmem_np);
>>>> +
>>>> +            kproc->rmem[i].bus_addr = rmem->base;
>>>> +            /* 64-bit address regions currently not supported */
>>>> +            kproc->rmem[i].dev_addr = (u32)rmem->base;
>>>> +            kproc->rmem[i].size = rmem->size;
>>>> +            kproc->rmem[i].cpu_addr = devm_ioremap_wc(dev, rmem->base, rmem->size);
>>>> +            if (!kproc->rmem[i].cpu_addr) {
>>>> +                    dev_err(dev, "failed to map reserved memory#%d at %pa of size %pa\n",
>>>> +                            i + 1, &rmem->base, &rmem->size);
>>>> +                    return -ENOMEM;
>>>> +            }
>>>> +
>>>> +            dev_dbg(dev, "reserved memory%d: bus addr %pa size 0x%zx va %pK da 0x%x\n",
>>>> +                    i + 1, &kproc->rmem[i].bus_addr,
>>>> +                    kproc->rmem[i].size, kproc->rmem[i].cpu_addr,
>>>> +                    kproc->rmem[i].dev_addr);
>>>> +    }
>>>> +    kproc->num_rmems = num_rmems;
>>>> +
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +static struct ti_sci_proc *k3_m4_rproc_of_get_tsp(struct device *dev,
>>>> +                                              const struct ti_sci_handle *sci)
>>>> +{
>>>> +    struct ti_sci_proc *tsp;
>>>> +    u32 temp[2];
>>>> +    int ret;
>>>> +
>>>> +    ret = of_property_read_u32_array(dev->of_node, "ti,sci-proc-ids",
>>>> +                                     temp, 2);
>>>> +    if (ret < 0)
>>>> +            return ERR_PTR(ret);
>>>> +
>>>> +    tsp = devm_kzalloc(dev, sizeof(*tsp), GFP_KERNEL);
>>>> +    if (!tsp)
>>>> +            return ERR_PTR(-ENOMEM);
>>>> +
>>>> +    tsp->dev = dev;
>>>> +    tsp->sci = sci;
>>>> +    tsp->ops = &sci->ops.proc_ops;
>>>> +    tsp->proc_id = temp[0];
>>>> +    tsp->host_id = temp[1];
>>>> +
>>>> +    return tsp;
>>>> +}
>>>> +
>>>> +static void k3_m4_release_tsp(void *data)
>>>> +{
>>>> +    struct ti_sci_proc *tsp = data;
>>>> +
>>>> +    ti_sci_proc_release(tsp);
>>>> +}
>>>> +
>>>> +/*
>>>> + * Power up the M4F remote processor.
>>>> + *
>>>> + * This function will be invoked only after the firmware for this rproc
>>>> + * was loaded, parsed successfully, and all of its resource requirements
>>>> + * were met. This callback is invoked only in remoteproc mode.
>>>> + */
>>>> +static int k3_m4_rproc_start(struct rproc *rproc)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = rproc->priv;
>>>> +    int ret;
>>>> +
>>>> +    ret = k3_m4_rproc_request_mbox(rproc);
>>>> +    if (ret)
>>>> +            return ret;
>>>> +
>>>> +    ret = k3_m4_rproc_release(kproc);
>>>> +    if (ret)
>>>> +            goto put_mbox;
>>>> +
>>>> +    return 0;
>>>> +
>>>> +put_mbox:
>>>> +    mbox_free_channel(kproc->mbox);
>>>> +    return ret;
>>>> +}
>>>> +
>>>> +/*
>>>> + * Stop the M4 remote processor.
>>>> + *
>>>> + * This function puts the M4 processor into reset, and finishes processing
>>>> + * of any pending messages. This callback is invoked only in remoteproc mode.
>>>> + */
>>>> +static int k3_m4_rproc_stop(struct rproc *rproc)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = rproc->priv;
>>>> +
>>>> +    mbox_free_channel(kproc->mbox);
>>>> +
>>>> +    k3_m4_rproc_reset(kproc);
>>>> +
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +/*
>>>> + * Attach to a running M4 remote processor (IPC-only mode)
>>>> + *
>>>> + * This rproc attach callback only needs to request the mailbox, the remote
>>>> + * processor is already booted, so there is no need to issue any TI-SCI
>>>> + * commands to boot the M4 core. This callback is used only in IPC-only mode.
>>>> + */
>>>> +static int k3_m4_rproc_attach(struct rproc *rproc)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = rproc->priv;
>>>> +    struct device *dev = kproc->dev;
>>>> +    int ret;
>>>> +
>>>> +    ret = k3_m4_rproc_request_mbox(rproc);
>>>> +    if (ret)
>>>> +            return ret;
>>>> +
>>>> +    dev_info(dev, "M4 initialized in IPC-only mode\n");
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +/*
>>>> + * Detach from a running M4 remote processor (IPC-only mode)
>>>> + *
>>>> + * This rproc detach callback performs the opposite operation to attach callback
>>>> + * and only needs to release the mailbox, the M4 core is not stopped and will
>>>> + * be left to continue to run its booted firmware. This callback is invoked only in
>>>> + * IPC-only mode.
>>>> + */
>>>> +static int k3_m4_rproc_detach(struct rproc *rproc)
>>>> +{
>>>> +    struct k3_m4_rproc *kproc = rproc->priv;
>>>> +    struct device *dev = kproc->dev;
>>>> +
>>>> +    mbox_free_channel(kproc->mbox);
>>>> +    dev_info(dev, "M4 deinitialized in IPC-only mode\n");
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +static const struct rproc_ops k3_m4_rproc_ops = {
>>>> +    .start          = k3_m4_rproc_start,
>>>> +    .stop           = k3_m4_rproc_stop,
>>>> +    .attach         = k3_m4_rproc_attach,
>>>> +    .detach         = k3_m4_rproc_detach,
>>>> +    .kick           = k3_m4_rproc_kick,
>>>> +    .da_to_va       = k3_m4_rproc_da_to_va,
>>>> +    .get_loaded_rsc_table = k3_m4_get_loaded_rsc_table,
>>>> +};
>>>> +
>>>> +static int k3_m4_rproc_probe(struct platform_device *pdev)
>>>> +{
>>>> +    struct device *dev = &pdev->dev;
>>>> +    struct device_node *np = dev->of_node;
>>>> +    const struct k3_m4_rproc_dev_data *data;
>>>> +    struct k3_m4_rproc *kproc;
>>>> +    struct rproc *rproc;
>>>> +    const char *fw_name;
>>>> +    bool r_state = false;
>>>> +    bool p_state = false;
>>>> +    int ret = 0;
>>>> +
>>>> +    data = device_get_match_data(dev);
>>>> +    if (!data)
>>>> +            return -ENODEV;
>>>> +
>>>> +    ret = rproc_of_parse_firmware(dev, 0, &fw_name);
>>>> +    if (ret)
>>>> +            return dev_err_probe(dev, ret, "failed to parse firmware-name property\n");
>>>> +
>>>> +    rproc = devm_rproc_alloc(dev, dev_name(dev), &k3_m4_rproc_ops, fw_name,
>>>> +                             sizeof(*kproc));
>>>> +    if (!rproc)
>>>> +            return -ENOMEM;
>>>> +
>>>> +    rproc->has_iommu = false;
>>>> +    rproc->recovery_disabled = true;
>>>> +    if (data->uses_lreset) {
>>>> +            rproc->ops->prepare = k3_m4_rproc_prepare;
>>>> +            rproc->ops->unprepare = k3_m4_rproc_unprepare;
>>>> +    }
>>>> +    kproc = rproc->priv;
>>>> +    kproc->rproc = rproc;
>>>> +    kproc->dev = dev;
>>>> +    kproc->data = data;
>>>> +
>>>> +    kproc->ti_sci = devm_ti_sci_get_by_phandle(dev, "ti,sci");
>>>> +    if (IS_ERR(kproc->ti_sci))
>>>> +            return dev_err_probe(dev, PTR_ERR(kproc->ti_sci),
>>>> +                                 "failed to get ti-sci handle\n");
>>>> +
>>>> +    ret = of_property_read_u32(np, "ti,sci-dev-id", &kproc->ti_sci_id);
>>>> +    if (ret)
>>>> +            return dev_err_probe(dev, ret, "missing 'ti,sci-dev-id' property\n");
>>>> +
>>>> +    kproc->reset = devm_reset_control_get_exclusive(dev, NULL);
>>>> +    if (IS_ERR(kproc->reset))
>>>> +            return dev_err_probe(dev, PTR_ERR(kproc->reset), "failed to get reset\n");
>>>> +
>>>> +    kproc->tsp = k3_m4_rproc_of_get_tsp(dev, kproc->ti_sci);
>>>> +    if (IS_ERR(kproc->tsp))
>>>> +            return dev_err_probe(dev, PTR_ERR(kproc->tsp),
>>>> +                                 "failed to construct ti-sci proc control\n");
>>>> +
>>>> +    ret = ti_sci_proc_request(kproc->tsp);
>>>> +    if (ret < 0)
>>>> +            return dev_err_probe(dev, ret, "ti_sci_proc_request failed\n");
>>>> +    ret = devm_add_action_or_reset(dev, k3_m4_release_tsp, kproc->tsp);
>>>> +    if (ret)
>>>> +            return ret;
>>>> +
>>>> +    ret = k3_m4_rproc_of_get_memories(pdev, kproc);
>>>> +    if (ret)
>>>> +            return ret;
>>>> +
>>>> +    ret = k3_m4_reserved_mem_init(kproc);
>>>> +    if (ret)
>>>> +            return dev_err_probe(dev, ret, "reserved memory init failed\n");
>>>> +
>>>> +    ret = kproc->ti_sci->ops.dev_ops.is_on(kproc->ti_sci, kproc->ti_sci_id,
>>>> +                                           &r_state, &p_state);
>>>> +    if (ret)
>>>> +            return dev_err_probe(dev, ret,
>>>> +                                 "failed to get initial state, mode cannot be determined\n");
>>>> +
>>>> +    /* configure devices for either remoteproc or IPC-only mode */
>>>> +    if (p_state) {
>>>> +            dev_info(dev, "configured M4 for IPC-only mode\n");
>>>> +            rproc->state = RPROC_DETACHED;
>>>> +            /* override rproc ops with only required IPC-only mode ops */
>>>> +            rproc->ops->prepare = NULL;
>>>> +            rproc->ops->unprepare = NULL;
>>>> +            rproc->ops->start = NULL;
>>>> +            rproc->ops->stop = NULL;
>>>> +            rproc->ops->attach = k3_m4_rproc_attach;
>>>> +            rproc->ops->detach = k3_m4_rproc_detach;
>>>> +            rproc->ops->get_loaded_rsc_table = k3_m4_get_loaded_rsc_table;
>>>> +    } else {
>>>> +            dev_info(dev, "configured M4 for remoteproc mode\n");
>>>> +            /*
>>>> +             * ensure the M4 local reset is asserted to ensure the core
>>>> +             * doesn't execute bogus code in .prepare() when the module
>>>> +             * reset is released.
>>>> +             */
>>>> +            if (data->uses_lreset) {
>>>> +                    ret = reset_control_status(kproc->reset);
>>>> +                    if (ret < 0) {
>>>> +                            return dev_err_probe(dev, ret, "failed to get reset status\n");
>>>> +                    } else if (ret == 0) {
>>>> +                            dev_warn(dev, "local reset is deasserted for device\n");
>>>> +                            k3_m4_rproc_reset(kproc);
>>>> +                    }
>>>> +            }
>>>> +    }
>>>> +
>>>> +    ret = devm_rproc_add(dev, rproc);
>>>> +    if (ret)
>>>> +            return dev_err_probe(dev, ret,
>>>> +                                 "failed to add register device with remoteproc core\n");
>>>> +
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +static const struct k3_m4_rproc_mem_data am64_m4_mems[] = {
>>>> +    { .name = "iram", .dev_addr = 0x0 },
>>>> +    { .name = "dram", .dev_addr = 0x30000 },
>>>> +};
>>>> +
>>>> +static const struct k3_m4_rproc_dev_data am64_m4_data = {
>>>> +    .mems = am64_m4_mems,
>>>> +    .num_mems = ARRAY_SIZE(am64_m4_mems),
>>>> +    .uses_lreset = true,
>>>
>>> If this is the case, why carrying k3_m4_rproc_dev_data::uses_lreset and all the
>>> code around it?
>>>
>>
>> It was to keep most of these functions consistent with k3-r5 and k3-dsp drivers
>> which do optionally have this local reset. For now I'll just remove it from
>> here.
>>
>> Thanks,
>> Andrew
>>
>>> I am done reviewing this set.
>>>
>>> Regards,
>>> Mathieu
>>>
>>>> +};
>>>> +
>>>> +static const struct of_device_id k3_m4_of_match[] = {
>>>> +    { .compatible = "ti,am64-m4fss", .data = &am64_m4_data, },
>>>> +    { /* sentinel */ },
>>>> +};
>>>> +MODULE_DEVICE_TABLE(of, k3_m4_of_match);
>>>> +
>>>> +static struct platform_driver k3_m4_rproc_driver = {
>>>> +    .probe  = k3_m4_rproc_probe,
>>>> +    .driver = {
>>>> +            .name = "k3-m4-rproc",
>>>> +            .of_match_table = k3_m4_of_match,
>>>> +    },
>>>> +};
>>>> +module_platform_driver(k3_m4_rproc_driver);
>>>> +
>>>> +MODULE_AUTHOR("Hari Nagalla <hnagalla@ti.com>");
>>>> +MODULE_DESCRIPTION("TI K3 M4 Remoteproc driver");
>>>> +MODULE_LICENSE("GPL");
>>>> --
>>>> 2.39.2
>>>>

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[PATCH v9 3/5] arm64: dts: ti: k3-am62: Add M4F remoteproc node

[Andrew Davis]

From: Hari Nagalla <hnagalla@ti.com>

The AM62x SoCs of the TI K3 family have a Cortex M4F core in the MCU
domain. This core can be used by non safety applications as a remote
processor. When used as a remote processor with virtio/rpmessage IPC,
two carveout reserved memory nodes are needed.

Disable by default as this node is not complete until mailbox data
is provided in the board level DT.

Signed-off-by: Hari Nagalla <hnagalla@ti.com>
Signed-off-by: Andrew Davis <afd@ti.com>
---
 arch/arm64/boot/dts/ti/k3-am62-mcu.dtsi | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am62-mcu.dtsi b/arch/arm64/boot/dts/ti/k3-am62-mcu.dtsi
index e66d486ef1f21..7f6f0007e8e81 100644
--- a/arch/arm64/boot/dts/ti/k3-am62-mcu.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62-mcu.dtsi
@@ -173,4 +173,17 @@ mcu_mcan1: can@4e18000 {
 		bosch,mram-cfg = <0x0 128 64 64 64 64 32 32>;
 		status = "disabled";
 	};
+
+	mcu_m4fss: m4fss@5000000 {
+		compatible = "ti,am64-m4fss";
+		reg = <0x00 0x5000000 0x00 0x30000>,
+		      <0x00 0x5040000 0x00 0x10000>;
+		reg-names = "iram", "dram";
+		resets = <&k3_reset 9 1>;
+		firmware-name = "am62-mcu-m4f0_0-fw";
+		ti,sci = <&dmsc>;
+		ti,sci-dev-id = <9>;
+		ti,sci-proc-ids = <0x18 0xff>;
+		status = "disabled";
+	};
 };
-- 
2.39.2


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[PATCH v9 4/5] arm64: dts: ti: k3-am625-sk: Add M4F remoteproc node

[Andrew Davis]

From: Hari Nagalla <hnagalla@ti.com>

The AM62x SoCs of the TI K3 family have a Cortex M4F core in the MCU
domain. This core can be used by non safety applications as a remote
processor. When used as a remote processor with virtio/rpmessage IPC,
two carveout reserved memory nodes are needed. The first region is used
as a DMA pool for the rproc device, and the second region will furnish
the static carveout regions for the firmware memory.

The current carveout addresses and sizes are defined statically for
each rproc device. The M4F processor does not have an MMU, and as such
requires the exact memory used by the firmware to be set-aside.

Signed-off-by: Hari Nagalla <hnagalla@ti.com>
Signed-off-by: Andrew Davis <afd@ti.com>
---
 .../arm64/boot/dts/ti/k3-am62x-sk-common.dtsi | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
index 3c45782ab2b78..167bec5c80006 100644
--- a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
@@ -48,6 +48,18 @@ ramoops@9ca00000 {
 			pmsg-size = <0x8000>;
 		};
 
+		mcu_m4fss_dma_memory_region: m4f-dma-memory@9cb00000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0x9cb00000 0x00 0x100000>;
+			no-map;
+		};
+
+		mcu_m4fss_memory_region: m4f-memory@9cc00000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0x9cc00000 0x00 0xe00000>;
+			no-map;
+		};
+
 		secure_tfa_ddr: tfa@9e780000 {
 			reg = <0x00 0x9e780000 0x00 0x80000>;
 			alignment = <0x1000>;
@@ -457,6 +469,13 @@ mbox_m4_0: mbox-m4-0 {
 	};
 };
 
+&mcu_m4fss {
+	mboxes = <&mailbox0_cluster0 &mbox_m4_0>;
+	memory-region = <&mcu_m4fss_dma_memory_region>,
+			<&mcu_m4fss_memory_region>;
+	status = "okay";
+};
+
 &usbss0 {
 	bootph-all;
 	status = "okay";
-- 
2.39.2


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[PATCH v9 5/5] arm64: defconfig: Enable TI K3 M4 remoteproc driver

[Andrew Davis]

From: Hari Nagalla <hnagalla@ti.com>

Some K3 platform devices (AM64x, AM62x) have a Cortex M4 core. Build
the M4 remote proc driver as a module for these platforms.

Signed-off-by: Hari Nagalla <hnagalla@ti.com>
Signed-off-by: Andrew Davis <afd@ti.com>
---
 arch/arm64/configs/defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 2c30d617e1802..04e8e2ca4aa10 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -1352,6 +1352,7 @@ CONFIG_QCOM_Q6V5_PAS=m
 CONFIG_QCOM_SYSMON=m
 CONFIG_QCOM_WCNSS_PIL=m
 CONFIG_TI_K3_DSP_REMOTEPROC=m
+CONFIG_TI_K3_M4_REMOTEPROC=m
 CONFIG_TI_K3_R5_REMOTEPROC=m
 CONFIG_RPMSG_CHAR=m
 CONFIG_RPMSG_CTRL=m
-- 
2.39.2


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