* [RFC v3 1/5] dt-bindings: Add a binding for Mediatek SCP
2019-01-21 7:18 [RFC v3 0/5] Add support for mt8183 SCP Pi-Hsun Shih
@ 2019-01-21 7:18 ` Pi-Hsun Shih
2019-01-21 15:30 ` Rob Herring
2019-01-21 7:18 ` [RFC v3 2/5] remoteproc/mediatek: add SCP support for mt8183 Pi-Hsun Shih
2019-01-21 7:18 ` [RFC v3 3/5] rpmsg: add rpmsg support for mt8183 SCP Pi-Hsun Shih
2 siblings, 1 reply; 5+ messages in thread
From: Pi-Hsun Shih @ 2019-01-21 7:18 UTC (permalink / raw)
Cc: Ohad Ben-Cohen, Mark Rutland, Nicolas Boichat,
open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS,
Erin Lo, open list:REMOTE PROCESSOR REMOTEPROC SUBSYSTEM,
open list, Bjorn Andersson, Rob Herring,
moderated list:ARM/Mediatek SoC support, Pi-Hsun Shih,
Matthias Brugger, moderated list:ARM/Mediatek SoC support
From: Erin Lo <erin.lo@mediatek.com>
Add a DT binding documentation of SCP for the
MT8183 SoC from Mediatek.
Signed-off-by: Erin Lo <erin.lo@mediatek.com>
---
Changes from v2:
- No change. I realized that for this patch series, there's no need to
add anything under the mt8183-scp node (neither the mt8183-rpmsg or
the cros-ec-rpmsg) for them to work, since mt8183-rpmsg is added
directly as a rproc_subdev by code, and cros-ec-rpmsg is dynamically
created by SCP name service.
Changes from v1:
- No change.
---
.../devicetree/bindings/remoteproc/mtk,scp.txt | 10 ++++++++++
1 file changed, 10 insertions(+)
create mode 100644 Documentation/devicetree/bindings/remoteproc/mtk,scp.txt
diff --git a/Documentation/devicetree/bindings/remoteproc/mtk,scp.txt b/Documentation/devicetree/bindings/remoteproc/mtk,scp.txt
new file mode 100644
index 00000000000000..b07e5c4ca9af1d
--- /dev/null
+++ b/Documentation/devicetree/bindings/remoteproc/mtk,scp.txt
@@ -0,0 +1,10 @@
+Mediatek SCP Bindings
+----------------------------------------
+
+This binding provides support for ARM Cortex M4 Co-processor found on some
+Mediatek SoCs.
+
+Required properties:
+- compatible Should be "mediatek,mt8183-scp"
+- clocks Clock for co-processor (See: ../clock/clock-bindings.txt)
+
--
2.20.1.321.g9e740568ce-goog
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [RFC v3 1/5] dt-bindings: Add a binding for Mediatek SCP
2019-01-21 7:18 ` [RFC v3 1/5] dt-bindings: Add a binding for Mediatek SCP Pi-Hsun Shih
@ 2019-01-21 15:30 ` Rob Herring
0 siblings, 0 replies; 5+ messages in thread
From: Rob Herring @ 2019-01-21 15:30 UTC (permalink / raw)
To: Pi-Hsun Shih
Cc: Ohad Ben-Cohen, Mark Rutland, Nicolas Boichat,
open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS,
Erin Lo, open list:REMOTE PROCESSOR (REMOTEPROC) SUBSYSTEM,
open list, Bjorn Andersson,
moderated list:ARM/Mediatek SoC support, Pi-Hsun Shih,
Matthias Brugger, moderated list:ARM/Mediatek SoC support
On Mon, 21 Jan 2019 15:18:29 +0800, Pi-Hsun Shih wrote:
> From: Erin Lo <erin.lo@mediatek.com>
>
> Add a DT binding documentation of SCP for the
> MT8183 SoC from Mediatek.
>
> Signed-off-by: Erin Lo <erin.lo@mediatek.com>
> ---
> Changes from v2:
> - No change. I realized that for this patch series, there's no need to
> add anything under the mt8183-scp node (neither the mt8183-rpmsg or
> the cros-ec-rpmsg) for them to work, since mt8183-rpmsg is added
> directly as a rproc_subdev by code, and cros-ec-rpmsg is dynamically
> created by SCP name service.
>
> Changes from v1:
> - No change.
> ---
> .../devicetree/bindings/remoteproc/mtk,scp.txt | 10 ++++++++++
> 1 file changed, 10 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/remoteproc/mtk,scp.txt
>
Reviewed-by: Rob Herring <robh@kernel.org>
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 5+ messages in thread
* [RFC v3 2/5] remoteproc/mediatek: add SCP support for mt8183
2019-01-21 7:18 [RFC v3 0/5] Add support for mt8183 SCP Pi-Hsun Shih
2019-01-21 7:18 ` [RFC v3 1/5] dt-bindings: Add a binding for Mediatek SCP Pi-Hsun Shih
@ 2019-01-21 7:18 ` Pi-Hsun Shih
2019-01-21 7:18 ` [RFC v3 3/5] rpmsg: add rpmsg support for mt8183 SCP Pi-Hsun Shih
2 siblings, 0 replies; 5+ messages in thread
From: Pi-Hsun Shih @ 2019-01-21 7:18 UTC (permalink / raw)
Cc: Ohad Ben-Cohen, Nicolas Boichat, Erin Lo,
open list:REMOTE PROCESSOR REMOTEPROC SUBSYSTEM, open list,
Bjorn Andersson, moderated list:ARM/Mediatek SoC support,
Pi-Hsun Shih, Matthias Brugger,
moderated list:ARM/Mediatek SoC support
From: Erin Lo <erin.lo@mediatek.com>
Provide a basic driver to control Cortex M4 co-processor
Signed-off-by: Erin Lo <erin.lo@mediatek.com>
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
---
Changes from v2:
- Squash patch 3 from v2 (separate the ipi interface) into this patch.
- Remove unused name argument from scp_ipi_register.
- Add scp_ipi_unregister for proper cleanup.
- Move IPI ids in sync with firmware.
- Add mb() in proper place, and correctly clear the run->signaled.
Changes from v1:
- Extract functions and rename variables in mtk_scp.c.
---
drivers/remoteproc/Kconfig | 9 +
drivers/remoteproc/Makefile | 1 +
drivers/remoteproc/mtk_common.h | 72 +++++
drivers/remoteproc/mtk_scp.c | 437 ++++++++++++++++++++++++++
drivers/remoteproc/mtk_scp_ipi.c | 126 ++++++++
include/linux/platform_data/mtk_scp.h | 135 ++++++++
6 files changed, 780 insertions(+)
create mode 100644 drivers/remoteproc/mtk_common.h
create mode 100644 drivers/remoteproc/mtk_scp.c
create mode 100644 drivers/remoteproc/mtk_scp_ipi.c
create mode 100644 include/linux/platform_data/mtk_scp.h
diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index f0abd260804473..ee0bda23768938 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -22,6 +22,15 @@ config IMX_REMOTEPROC
It's safe to say N here.
+config MTK_SCP
+ tristate "Mediatek SCP support"
+ depends on ARCH_MEDIATEK
+ help
+ Say y here to support Mediatek's SCP (Cortex M4
+ on MT8183) via the remote processor framework.
+
+ It's safe to say N here.
+
config OMAP_REMOTEPROC
tristate "OMAP remoteproc support"
depends on ARCH_OMAP4 || SOC_OMAP5
diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
index ce5d061e92be52..16b3e5e7a81c8e 100644
--- a/drivers/remoteproc/Makefile
+++ b/drivers/remoteproc/Makefile
@@ -10,6 +10,7 @@ remoteproc-y += remoteproc_sysfs.o
remoteproc-y += remoteproc_virtio.o
remoteproc-y += remoteproc_elf_loader.o
obj-$(CONFIG_IMX_REMOTEPROC) += imx_rproc.o
+obj-$(CONFIG_MTK_SCP) += mtk_scp.o mtk_scp_ipi.o
obj-$(CONFIG_OMAP_REMOTEPROC) += omap_remoteproc.o
obj-$(CONFIG_WKUP_M3_RPROC) += wkup_m3_rproc.o
obj-$(CONFIG_DA8XX_REMOTEPROC) += da8xx_remoteproc.o
diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
new file mode 100644
index 00000000000000..5b682e7a890b27
--- /dev/null
+++ b/drivers/remoteproc/mtk_common.h
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (c) 2018 MediaTek Inc.
+
+#ifndef __RPROC_MTK_COMMON_H
+#define __RPROC_MTK_COMMON_H
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/remoteproc.h>
+
+#define MT8183_SW_RSTN 0x0
+#define MT8183_SW_RSTN_BIT BIT(0)
+#define MT8183_SCP_TO_HOST 0x1C
+#define MT8183_SCP_IPC_INT_BIT BIT(0)
+#define MT8183_SCP_WDT_INT_BIT BIT(8)
+#define MT8183_HOST_TO_SCP 0x28
+#define MT8183_HOST_IPC_INT_BIT BIT(0)
+#define MT8183_SCP_SRAM_PDN 0x402C
+
+#define SCP_FW_VER_LEN 32
+
+struct scp_run {
+ u32 signaled;
+ s8 fw_ver[SCP_FW_VER_LEN];
+ u32 dec_capability;
+ u32 enc_capability;
+ wait_queue_head_t wq;
+};
+
+struct scp_ipi_desc {
+ scp_ipi_handler_t handler;
+ void *priv;
+};
+
+struct mtk_scp {
+ struct device *dev;
+ struct rproc *rproc;
+ struct clk *clk;
+ void __iomem *reg_base;
+ void __iomem *sram_base;
+ size_t sram_size;
+
+ struct share_obj *recv_buf;
+ struct share_obj *send_buf;
+ struct scp_run run;
+ struct mutex scp_mutex; /* for protecting mtk_scp data structure */
+ struct scp_ipi_desc ipi_desc[SCP_IPI_MAX];
+ bool ipi_id_ack[SCP_IPI_MAX];
+ wait_queue_head_t ack_wq;
+
+ void __iomem *cpu_addr;
+ phys_addr_t phys_addr;
+ size_t dram_size;
+};
+
+/**
+ * struct share_obj - SRAM buffer shared with
+ * AP and SCP
+ *
+ * @id: IPI id
+ * @len: share buffer length
+ * @share_buf: share buffer data
+ */
+struct share_obj {
+ s32 id;
+ u32 len;
+ u8 share_buf[288];
+};
+
+#endif
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
new file mode 100644
index 00000000000000..37325a92464524
--- /dev/null
+++ b/drivers/remoteproc/mtk_scp.c
@@ -0,0 +1,437 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (c) 2018 MediaTek Inc.
+
+#include <asm/barrier.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_data/mtk_scp.h>
+#include <linux/platform_device.h>
+#include <linux/remoteproc.h>
+
+#include "mtk_common.h"
+#include "remoteproc_internal.h"
+
+#define MAX_CODE_SIZE 0x500000
+
+struct platform_device *scp_get_plat_device(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *scp_node;
+ struct platform_device *scp_pdev;
+
+ scp_node = of_parse_phandle(dev->of_node, "mediatek,scp", 0);
+ if (!scp_node) {
+ dev_err(dev, "can't get scp node\n");
+ return NULL;
+ }
+
+ scp_pdev = of_find_device_by_node(scp_node);
+ if (WARN_ON(!scp_pdev)) {
+ dev_err(dev, "scp pdev failed\n");
+ of_node_put(scp_node);
+ return NULL;
+ }
+
+ return scp_pdev;
+}
+EXPORT_SYMBOL_GPL(scp_get_plat_device);
+
+static void scp_wdt_handler(struct mtk_scp *scp)
+{
+ rproc_report_crash(scp->rproc, RPROC_WATCHDOG);
+}
+
+static void scp_init_ipi_handler(void *data, unsigned int len, void *priv)
+{
+ struct mtk_scp *scp = (struct mtk_scp *)priv;
+ struct scp_run *run = (struct scp_run *)data;
+
+ scp->run.signaled = run->signaled;
+ strncpy(scp->run.fw_ver, run->fw_ver, SCP_FW_VER_LEN);
+ scp->run.dec_capability = run->dec_capability;
+ scp->run.enc_capability = run->enc_capability;
+ wake_up_interruptible(&scp->run.wq);
+}
+
+static void scp_ipi_handler(struct mtk_scp *scp)
+{
+ struct share_obj *rcv_obj = scp->recv_buf;
+ struct scp_ipi_desc *ipi_desc = scp->ipi_desc;
+ u8 tmp_data[288];
+
+ if (rcv_obj->id < SCP_IPI_MAX && ipi_desc[rcv_obj->id].handler) {
+ memcpy_fromio(tmp_data, &rcv_obj->share_buf, rcv_obj->len);
+ ipi_desc[rcv_obj->id].handler(&tmp_data[0],
+ rcv_obj->len,
+ ipi_desc[rcv_obj->id].priv);
+ scp->ipi_id_ack[rcv_obj->id] = true;
+ wake_up(&scp->ack_wq);
+ } else {
+ dev_err(scp->dev, "No such ipi id = %d\n", rcv_obj->id);
+ }
+}
+
+static int scp_ipi_init(struct mtk_scp *scp)
+{
+ size_t send_offset = 0x800 - sizeof(struct share_obj);
+ size_t recv_offset = send_offset - sizeof(struct share_obj);
+
+ /* Disable SCP to host interrupt */
+ writel(MT8183_SCP_IPC_INT_BIT, scp->reg_base + MT8183_SCP_TO_HOST);
+
+ /* shared buffer initialization */
+ scp->recv_buf = (__force struct share_obj *)(scp->sram_base +
+ recv_offset);
+ scp->send_buf = (__force struct share_obj *)(scp->sram_base +
+ send_offset);
+ memset_io(scp->recv_buf, 0, sizeof(scp->recv_buf));
+ memset_io(scp->send_buf, 0, sizeof(scp->send_buf));
+
+ return 0;
+}
+
+static void mtk_scp_reset_assert(const struct mtk_scp *scp)
+{
+ u32 val;
+
+ val = readl(scp->reg_base + MT8183_SW_RSTN);
+ val &= ~MT8183_SW_RSTN_BIT;
+ writel(val, scp->reg_base + MT8183_SW_RSTN);
+}
+
+static void mtk_scp_reset_deassert(const struct mtk_scp *scp)
+{
+ u32 val;
+
+ val = readl(scp->reg_base + MT8183_SW_RSTN);
+ val |= MT8183_SW_RSTN_BIT;
+ writel(val, scp->reg_base + MT8183_SW_RSTN);
+}
+
+static irqreturn_t scp_irq_handler(int irq, void *priv)
+{
+ struct mtk_scp *scp = priv;
+ u32 scp_to_host;
+
+ scp_to_host = readl(scp->reg_base + MT8183_SCP_TO_HOST);
+ if (scp_to_host & MT8183_SCP_IPC_INT_BIT) {
+ scp_ipi_handler(scp);
+ } else {
+ dev_err(scp->dev, "scp watchdog timeout! 0x%x", scp_to_host);
+ scp_wdt_handler(scp);
+ }
+
+ mb();
+ /* SCP won't send another interrupt until we set SCP_TO_HOST to 0. */
+ writel(MT8183_SCP_IPC_INT_BIT | MT8183_SCP_WDT_INT_BIT,
+ scp->reg_base + MT8183_SCP_TO_HOST);
+
+ return IRQ_HANDLED;
+}
+
+static int mtk_scp_load(struct rproc *rproc, const struct firmware *fw)
+{
+ const struct mtk_scp *scp = rproc->priv;
+ struct device *dev = scp->dev;
+ int ret;
+
+ /* Hold SCP in reset while loading FW. */
+ mtk_scp_reset_assert(scp);
+
+ ret = clk_prepare_enable(scp->clk);
+ if (ret) {
+ dev_err(dev, "failed to enable clocks\n");
+ return ret;
+ }
+
+ writel(0x0, scp->reg_base + MT8183_SCP_SRAM_PDN);
+
+ memcpy(scp->sram_base, fw->data, fw->size);
+ return ret;
+}
+
+static int mtk_scp_start(struct rproc *rproc)
+{
+ struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
+ struct device *dev = scp->dev;
+ struct scp_run *run;
+ int ret;
+
+ ret = clk_prepare_enable(scp->clk);
+ if (ret) {
+ dev_err(dev, "failed to enable clocks\n");
+ return ret;
+ }
+
+ run = &scp->run;
+ run->signaled = false;
+
+ mtk_scp_reset_deassert(scp);
+
+ ret = wait_event_interruptible_timeout(
+ run->wq,
+ run->signaled,
+ msecs_to_jiffies(2000));
+
+ if (ret == 0) {
+ dev_err(dev, "wait scp initialization timeout!\n");
+ ret = -ETIME;
+ goto stop;
+ }
+ if (ret == -ERESTARTSYS) {
+ dev_err(dev, "wait scp interrupted by a signal!\n");
+ goto stop;
+ }
+ dev_info(dev, "scp is ready. Fw version %s\n", run->fw_ver);
+
+ return 0;
+
+stop:
+ mtk_scp_reset_assert(scp);
+ clk_disable_unprepare(scp->clk);
+ return ret;
+}
+
+static void *mtk_scp_da_to_va(struct rproc *rproc, u64 da, int len)
+{
+ struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
+ int offset;
+
+ if (da < scp->sram_size) {
+ offset = da;
+ if (offset >= 0 && ((offset + len) < scp->sram_size)) {
+ return (__force void *)(scp->sram_base + offset);
+ }
+ } else if (da >= scp->sram_size && da < (scp->sram_size + MAX_CODE_SIZE)) {
+ offset = da - scp->sram_size;
+ if (offset >= 0 && (offset + len) < MAX_CODE_SIZE) {
+ return scp->cpu_addr + offset;
+ }
+ } else {
+ offset = da - scp->phys_addr;
+ if (offset >= 0 && (offset + len) < (scp->dram_size - MAX_CODE_SIZE)) {
+ return scp->cpu_addr + offset;
+ }
+ }
+
+ return NULL;
+}
+
+static int mtk_scp_stop(struct rproc *rproc)
+{
+ struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
+
+ mtk_scp_reset_assert(scp);
+ clk_disable_unprepare(scp->clk);
+
+ return 0;
+}
+
+static const struct rproc_ops mtk_scp_ops = {
+ .start = mtk_scp_start,
+ .stop = mtk_scp_stop,
+ .load = mtk_scp_load,
+ .da_to_va = mtk_scp_da_to_va,
+};
+
+unsigned int scp_get_vdec_hw_capa(struct platform_device *pdev)
+{
+ struct mtk_scp *scp = platform_get_drvdata(pdev);
+
+ return scp->run.dec_capability;
+}
+EXPORT_SYMBOL_GPL(scp_get_vdec_hw_capa);
+
+unsigned int scp_get_venc_hw_capa(struct platform_device *pdev)
+{
+ struct mtk_scp *scp = platform_get_drvdata(pdev);
+
+ return scp->run.enc_capability;
+}
+EXPORT_SYMBOL_GPL(scp_get_venc_hw_capa);
+
+void *scp_mapping_dm_addr(struct platform_device *pdev, u32 mem_addr)
+{
+ struct mtk_scp *scp = platform_get_drvdata(pdev);
+ void *ptr = NULL;
+
+ ptr = mtk_scp_da_to_va(scp->rproc, mem_addr, 0);
+
+ if (ptr)
+ return ptr;
+ else
+ return ERR_PTR(-EINVAL);
+}
+EXPORT_SYMBOL_GPL(scp_mapping_dm_addr);
+
+static int scp_map_memory_region(struct mtk_scp *scp)
+{
+ struct device_node *node;
+ struct resource r;
+ int ret;
+
+ node = of_parse_phandle(scp->dev->of_node, "memory-region", 0);
+ if (!node) {
+ dev_err(scp->dev, "no memory-region specified\n");
+ return -EINVAL;
+ }
+
+ ret = of_address_to_resource(node, 0, &r);
+ if (ret)
+ return ret;
+
+ scp->phys_addr = r.start;
+ scp->dram_size = resource_size(&r);
+ scp->cpu_addr = devm_ioremap_wc(scp->dev, scp->phys_addr, scp->dram_size);
+
+ if (!scp->cpu_addr) {
+ dev_err(scp->dev, "unable to map memory region: %pa+%zx\n",
+ &r.start, scp->dram_size);
+ return -EBUSY;
+ }
+
+ return 0;
+}
+
+static int mtk_scp_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct mtk_scp *scp;
+ struct rproc *rproc;
+ struct resource *res;
+ char *fw_name = "scp.img";
+ int ret;
+
+ rproc = rproc_alloc(dev,
+ np->name,
+ &mtk_scp_ops,
+ fw_name,
+ sizeof(*scp));
+ if (!rproc) {
+ dev_err(dev, "unable to allocate remoteproc\n");
+ return -ENOMEM;
+ }
+
+ scp = (struct mtk_scp *)rproc->priv;
+ scp->rproc = rproc;
+ scp->dev = dev;
+ platform_set_drvdata(pdev, scp);
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
+ scp->sram_base = devm_ioremap_resource(dev, res);
+ scp->sram_size = resource_size(res);
+ if (IS_ERR((__force void *)scp->sram_base)) {
+ dev_err(dev, "Failed to parse and map sram memory\n");
+ ret = PTR_ERR((__force void *)scp->sram_base);
+ goto free_rproc;
+ }
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
+ scp->reg_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR((__force void *)scp->reg_base)) {
+ dev_err(dev, "Failed to parse and map cfg memory\n");
+ ret = PTR_ERR((__force void *)scp->reg_base);
+ goto free_rproc;
+ }
+
+ ret = scp_map_memory_region(scp);
+ if (ret)
+ goto free_rproc;
+
+ scp->clk = devm_clk_get(dev, "main");
+ if (IS_ERR(scp->clk)) {
+ dev_err(dev, "Failed to get clock\n");
+ ret = PTR_ERR(scp->clk);
+ goto free_rproc;
+ }
+
+ ret = clk_prepare_enable(scp->clk);
+ if (ret) {
+ dev_err(dev, "failed to enable clocks\n");
+ goto free_rproc;
+ }
+
+ ret = scp_ipi_init(scp);
+ clk_disable_unprepare(scp->clk);
+ if (ret) {
+ dev_err(dev, "Failed to init ipi\n");
+ goto free_rproc;
+ }
+
+ /* register scp initialization IPI */
+ ret = scp_ipi_register(pdev,
+ SCP_IPI_INIT,
+ scp_init_ipi_handler,
+ scp);
+ if (ret) {
+ dev_err(dev, "Failed to register IPI_SCP_INIT\n");
+ goto free_rproc;
+ }
+
+ ret = devm_request_irq(dev,
+ platform_get_irq(pdev, 0),
+ scp_irq_handler,
+ 0,
+ pdev->name,
+ scp);
+
+ if (ret) {
+ dev_err(dev, "failed to request irq\n");
+ goto free_rproc;
+ }
+
+ mutex_init(&scp->scp_mutex);
+
+ init_waitqueue_head(&scp->run.wq);
+ init_waitqueue_head(&scp->ack_wq);
+
+ ret = rproc_add(rproc);
+ if (ret)
+ goto destroy_mutex;
+
+ return ret;
+
+destroy_mutex:
+ mutex_destroy(&scp->scp_mutex);
+free_rproc:
+ rproc_free(rproc);
+
+ return ret;
+}
+
+static int mtk_scp_remove(struct platform_device *pdev)
+{
+ struct mtk_scp *scp = platform_get_drvdata(pdev);
+
+ rproc_del(scp->rproc);
+ rproc_free(scp->rproc);
+
+ return 0;
+}
+
+static const struct of_device_id mtk_scp_of_match[] = {
+ { .compatible = "mediatek,mt8183-scp"},
+ {},
+};
+MODULE_DEVICE_TABLE(of, mtk_scp_of_match);
+
+static struct platform_driver mtk_scp_driver = {
+ .probe = mtk_scp_probe,
+ .remove = mtk_scp_remove,
+ .driver = {
+ .name = "mtk-scp",
+ .of_match_table = of_match_ptr(mtk_scp_of_match),
+ },
+};
+
+module_platform_driver(mtk_scp_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MediaTek scp control driver");
diff --git a/drivers/remoteproc/mtk_scp_ipi.c b/drivers/remoteproc/mtk_scp_ipi.c
new file mode 100644
index 00000000000000..f74acdf68f3867
--- /dev/null
+++ b/drivers/remoteproc/mtk_scp_ipi.c
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (c) 2018 MediaTek Inc.
+
+#include <asm/barrier.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_data/mtk_scp.h>
+#include <linux/platform_device.h>
+
+#include "mtk_common.h"
+
+int scp_ipi_register(struct platform_device *pdev,
+ enum scp_ipi_id id,
+ scp_ipi_handler_t handler,
+ void *priv)
+{
+ struct mtk_scp *scp = platform_get_drvdata(pdev);
+ struct scp_ipi_desc *ipi_desc;
+
+ if (!scp) {
+ dev_err(&pdev->dev, "scp device is not ready\n");
+ return -EPROBE_DEFER;
+ }
+
+ if (WARN(id < 0 || id >= SCP_IPI_MAX || handler == NULL,
+ "register scp ipi id %d with invalid arguments\n", id))
+ return -EINVAL;
+
+ ipi_desc = scp->ipi_desc;
+ ipi_desc[id].handler = handler;
+ ipi_desc[id].priv = priv;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(scp_ipi_register);
+
+void scp_ipi_unregister(struct platform_device *pdev, enum scp_ipi_id id)
+{
+ struct mtk_scp *scp = platform_get_drvdata(pdev);
+ struct scp_ipi_desc *ipi_desc;
+
+ if (!scp)
+ return;
+
+ if (WARN(id < 0 || id >= SCP_IPI_MAX,
+ "unregister scp ipi id %d with invalid arguments\n", id))
+ return;
+
+ ipi_desc = scp->ipi_desc;
+ ipi_desc[id].handler = NULL;
+ ipi_desc[id].priv = NULL;
+}
+EXPORT_SYMBOL_GPL(scp_ipi_unregister);
+
+int scp_ipi_send(struct platform_device *pdev,
+ enum scp_ipi_id id,
+ void *buf,
+ unsigned int len,
+ unsigned int wait)
+{
+ struct mtk_scp *scp = platform_get_drvdata(pdev);
+ struct share_obj *send_obj = scp->send_buf;
+ unsigned long timeout;
+ int ret;
+
+ if (WARN(id <= SCP_IPI_INIT || id >= SCP_IPI_MAX ||
+ len > sizeof(send_obj->share_buf) || !buf,
+ "failed to send ipi message\n"))
+ return -EINVAL;
+
+ ret = clk_prepare_enable(scp->clk);
+ if (ret) {
+ dev_err(scp->dev, "failed to enable clock\n");
+ return ret;
+ }
+
+ mutex_lock(&scp->scp_mutex);
+
+ /* Wait until SCP receives the last command */
+ timeout = jiffies + msecs_to_jiffies(2000);
+ do {
+ if (time_after(jiffies, timeout)) {
+ dev_err(scp->dev, "scp_ipi_send: IPI timeout!\n");
+ ret = -EIO;
+ mutex_unlock(&scp->scp_mutex);
+ goto clock_disable;
+ }
+ } while (readl(scp->reg_base + MT8183_HOST_TO_SCP));
+
+ memcpy(send_obj->share_buf, buf, len);
+ send_obj->len = len;
+ send_obj->id = id;
+
+ scp->ipi_id_ack[id] = false;
+ mb();
+ /* send the command to SCP */
+ writel(MT8183_HOST_IPC_INT_BIT, scp->reg_base + MT8183_HOST_TO_SCP);
+
+ mutex_unlock(&scp->scp_mutex);
+
+ if (wait) {
+ /* wait for SCP's ACK */
+ timeout = msecs_to_jiffies(wait);
+ ret = wait_event_timeout(scp->ack_wq,
+ scp->ipi_id_ack[id],
+ timeout);
+ scp->ipi_id_ack[id] = false;
+ if (WARN(!ret,
+ "scp ipi %d ack time out !", id))
+ ret = -EIO;
+ else
+ ret = 0;
+ }
+
+clock_disable:
+ clk_disable_unprepare(scp->clk);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(scp_ipi_send);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MediaTek scp IPI interface");
diff --git a/include/linux/platform_data/mtk_scp.h b/include/linux/platform_data/mtk_scp.h
new file mode 100644
index 00000000000000..0e999ec319446b
--- /dev/null
+++ b/include/linux/platform_data/mtk_scp.h
@@ -0,0 +1,135 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2018 MediaTek Inc.
+ */
+
+#ifndef _MTK_SCP_H
+#define _MTK_SCP_H
+
+#include <linux/platform_device.h>
+
+typedef void (*scp_ipi_handler_t) (void *data,
+ unsigned int len,
+ void *priv);
+
+/**
+ * enum ipi_id - the id of inter-processor interrupt
+ *
+ * @SCP_IPI_INIT: The interrupt from scp is to notfiy kernel
+ * SCP initialization completed.
+ * IPI_SCP_INIT is sent from SCP when firmware is
+ * loaded. AP doesn't need to send IPI_SCP_INIT
+ * command to SCP.
+ * For other IPI below, AP should send the request
+ * to SCP to trigger the interrupt.
+ * @IPI_MAX: The maximum IPI number
+ */
+
+enum scp_ipi_id {
+ SCP_IPI_INIT = 0,
+ SCP_IPI_VDEC_H264,
+ SCP_IPI_VDEC_VP8,
+ SCP_IPI_VDEC_VP9,
+ SCP_IPI_VENC_H264,
+ SCP_IPI_VENC_VP8,
+ SCP_IPI_MDP,
+ SCP_IPI_CROS_HOST_CMD,
+ SCP_IPI_MAX,
+};
+
+/**
+ * scp_ipi_register - register an ipi function
+ *
+ * @pdev: SCP platform device
+ * @id: IPI ID
+ * @handler: IPI handler
+ * @priv: private data for IPI handler
+ *
+ * Register an ipi function to receive ipi interrupt from SCP.
+ *
+ * Return: Return 0 if ipi registers successfully, otherwise it is failed.
+ */
+int scp_ipi_register(struct platform_device *pdev,
+ enum scp_ipi_id id,
+ scp_ipi_handler_t handler,
+ void *priv);
+
+/**
+ * scp_ipi_unregister - unregister an ipi function
+ *
+ * @pdev: SCP platform device
+ * @id: IPI ID
+ *
+ * Unregister an ipi function to receive ipi interrupt from SCP.
+ */
+void scp_ipi_unregister(struct platform_device *pdev, enum scp_ipi_id id);
+
+/**
+ * scp_ipi_send - send data from AP to scp.
+ *
+ * @pdev: SCP platform device
+ * @id: IPI ID
+ * @buf: the data buffer
+ * @len: the data buffer length
+ * @wait: 1: need ack
+ *
+ * This function is thread-safe. When this function returns,
+ * SCP has received the data and starts the processing.
+ * When the processing completes, IPI handler registered
+ * by scp_ipi_register will be called in interrupt context.
+ *
+ * Return: Return 0 if sending data successfully, otherwise it is failed.
+ **/
+int scp_ipi_send(struct platform_device *pdev,
+ enum scp_ipi_id id,
+ void *buf,
+ unsigned int len,
+ unsigned int wait);
+
+/**
+ * scp_get_plat_device - get SCP's platform device
+ *
+ * @pdev: the platform device of the module requesting SCP platform
+ * device for using SCP API.
+ *
+ * Return: Return NULL if it is failed.
+ * otherwise it is SCP's platform device
+ **/
+struct platform_device *scp_get_plat_device(struct platform_device *pdev);
+
+/**
+ * scp_get_vdec_hw_capa - get video decoder hardware capability
+ *
+ * @pdev: SCP platform device
+ *
+ * Return: video decoder hardware capability
+ **/
+unsigned int scp_get_vdec_hw_capa(struct platform_device *pdev);
+
+/**
+ * scp_get_venc_hw_capa - get video encoder hardware capability
+ *
+ * @pdev: SCP platform device
+ *
+ * Return: video encoder hardware capability
+ **/
+unsigned int scp_get_venc_hw_capa(struct platform_device *pdev);
+
+/**
+ * scp_mapping_dm_addr - Mapping SRAM/DRAM to kernel virtual address
+ *
+ * @pdev: SCP platform device
+ * @mem_addr: SCP views memory address
+ *
+ * Mapping the SCP's SRAM address /
+ * DMEM (Data Extended Memory) memory address /
+ * Working buffer memory address to
+ * kernel virtual address.
+ *
+ * Return: Return ERR_PTR(-EINVAL) if mapping failed,
+ * otherwise the mapped kernel virtual address
+ **/
+void *scp_mapping_dm_addr(struct platform_device *pdev,
+ u32 mem_addr);
+
+#endif /* _MTK_SCP_H */
--
2.20.1.321.g9e740568ce-goog
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 5+ messages in thread* [RFC v3 3/5] rpmsg: add rpmsg support for mt8183 SCP.
2019-01-21 7:18 [RFC v3 0/5] Add support for mt8183 SCP Pi-Hsun Shih
2019-01-21 7:18 ` [RFC v3 1/5] dt-bindings: Add a binding for Mediatek SCP Pi-Hsun Shih
2019-01-21 7:18 ` [RFC v3 2/5] remoteproc/mediatek: add SCP support for mt8183 Pi-Hsun Shih
@ 2019-01-21 7:18 ` Pi-Hsun Shih
2 siblings, 0 replies; 5+ messages in thread
From: Pi-Hsun Shih @ 2019-01-21 7:18 UTC (permalink / raw)
Cc: Ohad Ben-Cohen, Nicolas Boichat, Erin Lo,
open list:REMOTE PROCESSOR REMOTEPROC SUBSYSTEM, open list,
Bjorn Andersson, moderated list:ARM/Mediatek SoC support,
Pi-Hsun Shih, Matthias Brugger,
moderated list:ARM/Mediatek SoC support
Add a simple rpmsg support for mt8183 SCP, that use IPI / IPC directly.
Lots of TODO, and I'm not sure on all file / type / variable namings.
Signed-off-by: Pi-Hsun Shih <pihsun@chromium.org>
---
Changes from v2:
- Unregiser IPI handler on unprepare.
- Lock the channel list on operations.
- Move SCP_IPI_NS_SERVICE to 0xFF.
Changes from v1:
- Do cleanup properly in mtk_rpmsg.c, which also removes the problem of
short-lived work items.
- Fix several issues checkpatch found.
---
drivers/remoteproc/mtk_common.h | 3 +
drivers/remoteproc/mtk_scp.c | 29 +-
drivers/remoteproc/mtk_scp_ipi.c | 5 +-
drivers/rpmsg/Kconfig | 8 +
drivers/rpmsg/Makefile | 1 +
drivers/rpmsg/mtk_rpmsg.c | 395 ++++++++++++++++++++++++++
include/linux/platform_data/mtk_scp.h | 6 +-
include/linux/rpmsg/mtk_rpmsg.h | 35 +++
8 files changed, 475 insertions(+), 7 deletions(-)
create mode 100644 drivers/rpmsg/mtk_rpmsg.c
create mode 100644 include/linux/rpmsg/mtk_rpmsg.h
diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
index 5b682e7a890b27..13a7088cbeb6e6 100644
--- a/drivers/remoteproc/mtk_common.h
+++ b/drivers/remoteproc/mtk_common.h
@@ -53,6 +53,9 @@ struct mtk_scp {
void __iomem *cpu_addr;
phys_addr_t phys_addr;
size_t dram_size;
+
+ struct platform_device *pdev;
+ struct rproc_subdev *rpmsg_subdev;
};
/**
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index 37325a92464524..0987e85e9aaeb4 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -13,6 +13,7 @@
#include <linux/platform_data/mtk_scp.h>
#include <linux/platform_device.h>
#include <linux/remoteproc.h>
+#include <linux/rpmsg/mtk_rpmsg.h>
#include "mtk_common.h"
#include "remoteproc_internal.h"
@@ -299,6 +300,23 @@ static int scp_map_memory_region(struct mtk_scp *scp)
return 0;
}
+static void scp_add_rpmsg_subdev(struct mtk_scp *scp)
+{
+ scp->rpmsg_subdev =
+ mtk_rpmsg_create_rproc_subdev(scp->pdev, scp->rproc);
+ if (scp->rpmsg_subdev)
+ rproc_add_subdev(scp->rproc, scp->rpmsg_subdev);
+}
+
+static void scp_remove_rpmsg_subdev(struct mtk_scp *scp)
+{
+ if (scp->rpmsg_subdev) {
+ rproc_remove_subdev(scp->rproc, scp->rpmsg_subdev);
+ mtk_rpmsg_destroy_rproc_subdev(scp->rpmsg_subdev);
+ scp->rpmsg_subdev = NULL;
+ }
+}
+
static int mtk_scp_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -322,6 +340,7 @@ static int mtk_scp_probe(struct platform_device *pdev)
scp = (struct mtk_scp *)rproc->priv;
scp->rproc = rproc;
scp->dev = dev;
+ scp->pdev = pdev;
platform_set_drvdata(pdev, scp);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
@@ -392,13 +411,16 @@ static int mtk_scp_probe(struct platform_device *pdev)
init_waitqueue_head(&scp->run.wq);
init_waitqueue_head(&scp->ack_wq);
+ scp_add_rpmsg_subdev(scp);
+
ret = rproc_add(rproc);
if (ret)
- goto destroy_mutex;
+ goto remove_subdev;
- return ret;
+ return 0;
-destroy_mutex:
+remove_subdev:
+ scp_remove_rpmsg_subdev(scp);
mutex_destroy(&scp->scp_mutex);
free_rproc:
rproc_free(rproc);
@@ -410,6 +432,7 @@ static int mtk_scp_remove(struct platform_device *pdev)
{
struct mtk_scp *scp = platform_get_drvdata(pdev);
+ scp_remove_rpmsg_subdev(scp);
rproc_del(scp->rproc);
rproc_free(scp->rproc);
diff --git a/drivers/remoteproc/mtk_scp_ipi.c b/drivers/remoteproc/mtk_scp_ipi.c
index f74acdf68f3867..539f246b9d08f7 100644
--- a/drivers/remoteproc/mtk_scp_ipi.c
+++ b/drivers/remoteproc/mtk_scp_ipi.c
@@ -67,8 +67,9 @@ int scp_ipi_send(struct platform_device *pdev,
int ret;
if (WARN(id <= SCP_IPI_INIT || id >= SCP_IPI_MAX ||
- len > sizeof(send_obj->share_buf) || !buf,
- "failed to send ipi message\n"))
+ id == SCP_IPI_NS_SERVICE ||
+ len > sizeof(send_obj->share_buf) || !buf,
+ "failed to send ipi message\n"))
return -EINVAL;
ret = clk_prepare_enable(scp->clk);
diff --git a/drivers/rpmsg/Kconfig b/drivers/rpmsg/Kconfig
index d0322b41eca54c..31e7eb904fbac0 100644
--- a/drivers/rpmsg/Kconfig
+++ b/drivers/rpmsg/Kconfig
@@ -15,6 +15,14 @@ config RPMSG_CHAR
in /dev. They make it possible for user-space programs to send and
receive rpmsg packets.
+config RPMSG_MTK_SCP
+ tristate "MediaTek SCP"
+ depends on MTK_SCP
+ select RPMSG
+ help
+ Say y here to enable support providing communication channels to
+ remote processors in MediaTek platforms.
+
config RPMSG_QCOM_GLINK_NATIVE
tristate
select RPMSG
diff --git a/drivers/rpmsg/Makefile b/drivers/rpmsg/Makefile
index 9aa859502d2752..ae92a7fb08f623 100644
--- a/drivers/rpmsg/Makefile
+++ b/drivers/rpmsg/Makefile
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_RPMSG) += rpmsg_core.o
obj-$(CONFIG_RPMSG_CHAR) += rpmsg_char.o
+obj-$(CONFIG_RPMSG_MTK_SCP) += mtk_rpmsg.o
obj-$(CONFIG_RPMSG_QCOM_GLINK_RPM) += qcom_glink_rpm.o
obj-$(CONFIG_RPMSG_QCOM_GLINK_NATIVE) += qcom_glink_native.o
obj-$(CONFIG_RPMSG_QCOM_GLINK_SMEM) += qcom_glink_smem.o
diff --git a/drivers/rpmsg/mtk_rpmsg.c b/drivers/rpmsg/mtk_rpmsg.c
new file mode 100644
index 00000000000000..734bf800acb745
--- /dev/null
+++ b/drivers/rpmsg/mtk_rpmsg.c
@@ -0,0 +1,395 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright 2018 Google LLC.
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_data/mtk_scp.h>
+#include <linux/platform_device.h>
+#include <linux/remoteproc.h>
+#include <linux/rpmsg/mtk_rpmsg.h>
+#include <linux/workqueue.h>
+
+#include "rpmsg_internal.h"
+
+/*
+ * TODO: This is built on top of scp_ipi_register / scp_ipi_send in mtk_scp.h.
+ * It's probably better to move the implementation of register / send to here
+ * instead of in remoteproc/mtk_scp_ipi.c
+ */
+/*
+ * TODO: Do we need some sort of vring for performance? We may be able to get
+ * rid of this file if so, but that would require SCP firmware support too.
+ */
+
+struct mtk_rpmsg_device {
+ struct rpmsg_device rpdev;
+ struct platform_device *scp_pdev;
+};
+
+struct mtk_rpmsg_endpoint {
+ struct rpmsg_endpoint ept;
+ struct platform_device *scp_pdev;
+};
+
+/* TODO: Naming is hard... */
+struct mtk_rpmsg_rproc_subdev {
+ struct rproc *scp_rproc;
+ struct platform_device *scp_pdev;
+ struct rpmsg_endpoint *ns_ept;
+ struct rproc_subdev subdev;
+
+ struct work_struct register_work;
+ struct list_head channels;
+ spinlock_t channels_lock;
+};
+
+#define to_mtk_subdev(d) container_of(d, struct mtk_rpmsg_rproc_subdev, subdev)
+
+struct mtk_rpmsg_channel_info {
+ struct rpmsg_channel_info info;
+ bool registered;
+ struct list_head list;
+};
+
+/**
+ * TODO: This is copied from virtio_rpmsg_bus.
+ * struct rpmsg_ns_msg - dynamic name service announcement message
+ * @name: name of remote service that is published
+ * @addr: address of remote service that is published
+ *
+ * This message is sent across to publish a new service, or announce
+ * about its removal. When we receive these messages, an appropriate
+ * rpmsg channel (i.e device) is created/destroyed. In turn, the ->probe()
+ * or ->remove() handler of the appropriate rpmsg driver will be invoked
+ * (if/as-soon-as one is registered).
+ */
+struct rpmsg_ns_msg {
+ char name[RPMSG_NAME_SIZE];
+ u32 addr;
+} __packed;
+
+#define to_scp_device(r) container_of(r, struct mtk_rpmsg_device, rpdev)
+#define to_scp_endpoint(r) container_of(r, struct mtk_rpmsg_endpoint, ept)
+
+static const struct rpmsg_endpoint_ops mtk_rpmsg_endpoint_ops;
+
+static void __ept_release(struct kref *kref)
+{
+ struct rpmsg_endpoint *ept = container_of(kref, struct rpmsg_endpoint,
+ refcount);
+ kfree(to_scp_endpoint(ept));
+}
+
+static void mtk_rpmsg_ipi_handler(void *data, unsigned int len, void *priv)
+{
+ struct mtk_rpmsg_endpoint *mept = priv;
+ struct rpmsg_endpoint *ept = &mept->ept;
+
+ /* TODO: What if the cb() returns error? */
+ (*ept->cb)(ept->rpdev, data, len, ept->priv, ept->addr);
+}
+
+static struct rpmsg_endpoint *
+__rpmsg_create_ept(struct platform_device *scp_pdev, struct rpmsg_device *rpdev,
+ rpmsg_rx_cb_t cb, void *priv,
+ u32 id)
+{
+ struct mtk_rpmsg_endpoint *mept;
+ struct rpmsg_endpoint *ept;
+
+ int ret;
+
+ mept = kzalloc(sizeof(*mept), GFP_KERNEL);
+ if (!mept)
+ return NULL;
+ mept->scp_pdev = scp_pdev;
+
+ ept = &mept->ept;
+ kref_init(&ept->refcount);
+
+ ept->rpdev = rpdev;
+ ept->cb = cb;
+ ept->priv = priv;
+ ept->ops = &mtk_rpmsg_endpoint_ops;
+ ept->addr = id;
+
+ ret = scp_ipi_register(scp_pdev, id, mtk_rpmsg_ipi_handler, mept);
+ if (ret) {
+ dev_err(&scp_pdev->dev, "ipi register failed, id = %d", id);
+ kref_put(&ept->refcount, __ept_release);
+ return NULL;
+ }
+
+ return ept;
+}
+
+static struct rpmsg_endpoint *
+mtk_rpmsg_create_ept(struct rpmsg_device *rpdev, rpmsg_rx_cb_t cb, void *priv,
+ struct rpmsg_channel_info chinfo)
+{
+ struct platform_device *scp_pdev = to_scp_device(rpdev)->scp_pdev;
+ /* TODO: Is using src as IPI id "correct"? */
+ return __rpmsg_create_ept(scp_pdev, rpdev, cb, priv, chinfo.src);
+}
+
+static const struct rpmsg_device_ops mtk_rpmsg_device_ops = {
+ .create_ept = mtk_rpmsg_create_ept,
+};
+
+static void mtk_rpmsg_destroy_ept(struct rpmsg_endpoint *ept)
+{
+ struct mtk_rpmsg_endpoint *mept = to_scp_endpoint(ept);
+
+ scp_ipi_unregister(mept->scp_pdev, ept->addr);
+ kref_put(&ept->refcount, __ept_release);
+}
+
+static int __mtk_rpmsg_send(struct mtk_rpmsg_endpoint *mept, void *data,
+ int len, bool wait)
+{
+ /* TODO: This currently always wait for SCP to receive last command. */
+ return scp_ipi_send(mept->scp_pdev, mept->ept.addr, data, len, 0);
+}
+
+static int mtk_rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
+{
+ struct mtk_rpmsg_endpoint *mept = to_scp_endpoint(ept);
+
+ return __mtk_rpmsg_send(mept, data, len, true);
+}
+
+static int mtk_rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
+{
+ struct mtk_rpmsg_endpoint *mept = to_scp_endpoint(ept);
+
+ return __mtk_rpmsg_send(mept, data, len, false);
+}
+
+static const struct rpmsg_endpoint_ops mtk_rpmsg_endpoint_ops = {
+ .destroy_ept = mtk_rpmsg_destroy_ept,
+ .send = mtk_rpmsg_send,
+ .trysend = mtk_rpmsg_trysend,
+};
+
+static void mtk_rpmsg_release_device(struct device *dev)
+{
+ struct rpmsg_device *rpdev = to_rpmsg_device(dev);
+ struct mtk_rpmsg_device *mdev = to_scp_device(rpdev);
+
+ kfree(mdev);
+}
+
+static int mtk_rpmsg_register_device(struct platform_device *scp_pdev,
+ struct rpmsg_channel_info *info)
+{
+ struct rpmsg_device *rpdev;
+ struct mtk_rpmsg_device *mdev;
+ int ret;
+
+ mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
+ if (!mdev)
+ return -ENOMEM;
+
+ mdev->scp_pdev = scp_pdev;
+
+ rpdev = &mdev->rpdev;
+ rpdev->ops = &mtk_rpmsg_device_ops;
+ rpdev->src = info->src;
+ rpdev->dst = info->dst;
+ strncpy(rpdev->id.name, info->name, RPMSG_NAME_SIZE);
+
+ rpdev->dev.parent = &scp_pdev->dev;
+ rpdev->dev.release = mtk_rpmsg_release_device;
+
+ ret = rpmsg_register_device(rpdev);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void mtk_register_device_work_function(struct work_struct *register_work)
+{
+ struct mtk_rpmsg_rproc_subdev *mtk_subdev = container_of(
+ register_work, struct mtk_rpmsg_rproc_subdev, register_work);
+ struct platform_device *scp_pdev = mtk_subdev->scp_pdev;
+ struct mtk_rpmsg_channel_info *info;
+
+ int ret;
+ unsigned long flags;
+
+ spin_lock_irqsave(&mtk_subdev->channels_lock, flags);
+ list_for_each_entry(info, &mtk_subdev->channels, list) {
+ if (info->registered)
+ continue;
+
+ spin_unlock_irqrestore(&mtk_subdev->channels_lock, flags);
+ ret = mtk_rpmsg_register_device(scp_pdev, &info->info);
+ spin_lock_irqsave(&mtk_subdev->channels_lock, flags);
+
+ if (ret) {
+ dev_err(&scp_pdev->dev, "Can't create rpmsg_device\n");
+ continue;
+ }
+
+ info->registered = true;
+ }
+ spin_unlock_irqrestore(&mtk_subdev->channels_lock, flags);
+}
+
+static int mtk_rpmsg_create_device(struct mtk_rpmsg_rproc_subdev *mtk_subdev,
+ char *name, u32 addr)
+{
+ struct mtk_rpmsg_channel_info *info;
+ unsigned long flags;
+
+ /* This is called in interrupt context from name service callback. */
+ info = kzalloc(sizeof(*info), GFP_ATOMIC);
+ if (!info)
+ return -ENOMEM;
+
+ strncpy(info->info.name, name, RPMSG_NAME_SIZE);
+ info->info.src = addr;
+ info->info.dst = RPMSG_ADDR_ANY;
+ spin_lock_irqsave(&mtk_subdev->channels_lock, flags);
+ list_add(&info->list, &mtk_subdev->channels);
+ spin_unlock_irqrestore(&mtk_subdev->channels_lock, flags);
+
+ schedule_work(&mtk_subdev->register_work);
+ return 0;
+}
+
+static int mtk_rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len,
+ void *priv, u32 src)
+{
+ struct rpmsg_ns_msg *msg = data;
+ struct mtk_rpmsg_rproc_subdev *mtk_subdev = priv;
+ struct device *dev = &mtk_subdev->scp_pdev->dev;
+
+ int ret;
+
+ if (len != sizeof(*msg)) {
+ dev_err(dev, "malformed ns msg (%d)\n", len);
+ return -EINVAL;
+ }
+
+ /*
+ * the name service ept does _not_ belong to a real rpmsg channel,
+ * and is handled by the rpmsg bus itself.
+ * for sanity reasons, make sure a valid rpdev has _not_ sneaked
+ * in somehow.
+ */
+ if (rpdev) {
+ dev_err(dev, "anomaly: ns ept has an rpdev handle\n");
+ return -EINVAL;
+ }
+
+ /* don't trust the remote processor for null terminating the name */
+ msg->name[RPMSG_NAME_SIZE - 1] = '\0';
+
+ dev_info(dev, "creating channel %s addr 0x%x\n", msg->name, msg->addr);
+
+ ret = mtk_rpmsg_create_device(mtk_subdev, msg->name, msg->addr);
+ if (ret) {
+ dev_err(dev, "create rpmsg device failed\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+int mtk_rpmsg_prepare(struct rproc_subdev *subdev)
+{
+ struct mtk_rpmsg_rproc_subdev *mtk_subdev;
+ struct platform_device *scp_pdev;
+
+ mtk_subdev = to_mtk_subdev(subdev);
+ scp_pdev = mtk_subdev->scp_pdev;
+
+ /* a dedicated endpoint handles the name service msgs */
+ mtk_subdev->ns_ept =
+ __rpmsg_create_ept(scp_pdev, NULL, mtk_rpmsg_ns_cb, mtk_subdev,
+ SCP_IPI_NS_SERVICE);
+ if (!mtk_subdev->ns_ept) {
+ dev_err(&scp_pdev->dev,
+ "failed to create name service endpoint\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+void mtk_rpmsg_unprepare(struct rproc_subdev *subdev)
+{
+ struct mtk_rpmsg_channel_info *info, *next;
+ struct device *dev;
+ struct mtk_rpmsg_rproc_subdev *mtk_subdev = to_mtk_subdev(subdev);
+ unsigned long flags;
+
+ dev = &mtk_subdev->scp_pdev->dev;
+
+ cancel_work_sync(&mtk_subdev->register_work);
+ /*
+ * TODO: It feels like there's still possible race condition for some
+ * callback to schedule new work after the cancel_work_sync. How's this
+ * typically handled?
+ */
+ spin_lock_irqsave(&mtk_subdev->channels_lock, flags);
+ list_for_each_entry(info, &mtk_subdev->channels, list) {
+ if (!info->registered)
+ continue;
+ spin_unlock_irqrestore(&mtk_subdev->channels_lock, flags);
+ if (rpmsg_unregister_device(dev, &info->info)) {
+ dev_warn(
+ dev,
+ "rpmsg_unregister_device failed for %s.%d.%d\n",
+ info->info.name, info->info.src,
+ info->info.dst);
+ }
+ spin_lock_irqsave(&mtk_subdev->channels_lock, flags);
+ }
+
+ list_for_each_entry_safe(info, next,
+ &mtk_subdev->channels, list) {
+ list_del(&info->list);
+ kfree(info);
+ }
+ spin_unlock_irqrestore(&mtk_subdev->channels_lock, flags);
+
+ kref_put(&mtk_subdev->ns_ept->refcount, __ept_release);
+}
+
+struct rproc_subdev *
+mtk_rpmsg_create_rproc_subdev(struct platform_device *scp_pdev,
+ struct rproc *scp_rproc)
+{
+ struct mtk_rpmsg_rproc_subdev *mtk_subdev;
+
+ mtk_subdev = kzalloc(sizeof(*mtk_subdev), GFP_KERNEL);
+ if (!mtk_subdev)
+ return NULL;
+
+ mtk_subdev->scp_pdev = scp_pdev;
+ mtk_subdev->scp_rproc = scp_rproc;
+ mtk_subdev->subdev.prepare = mtk_rpmsg_prepare;
+ mtk_subdev->subdev.unprepare = mtk_rpmsg_unprepare;
+ INIT_LIST_HEAD(&mtk_subdev->channels);
+ INIT_WORK(&mtk_subdev->register_work,
+ mtk_register_device_work_function);
+
+ return &mtk_subdev->subdev;
+}
+EXPORT_SYMBOL_GPL(mtk_rpmsg_create_rproc_subdev);
+
+void mtk_rpmsg_destroy_rproc_subdev(struct rproc_subdev *subdev)
+{
+ struct mtk_rpmsg_rproc_subdev *mtk_subdev = to_mtk_subdev(subdev);
+
+ kfree(mtk_subdev);
+}
+EXPORT_SYMBOL_GPL(mtk_rpmsg_destroy_rproc_subdev);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MediaTek scp rpmsg driver");
diff --git a/include/linux/platform_data/mtk_scp.h b/include/linux/platform_data/mtk_scp.h
index 0e999ec319446b..643ef305a9e88d 100644
--- a/include/linux/platform_data/mtk_scp.h
+++ b/include/linux/platform_data/mtk_scp.h
@@ -22,7 +22,7 @@ typedef void (*scp_ipi_handler_t) (void *data,
* command to SCP.
* For other IPI below, AP should send the request
* to SCP to trigger the interrupt.
- * @IPI_MAX: The maximum IPI number
+ * @SCP_IPI_MAX: The maximum IPI number
*/
enum scp_ipi_id {
@@ -34,9 +34,11 @@ enum scp_ipi_id {
SCP_IPI_VENC_VP8,
SCP_IPI_MDP,
SCP_IPI_CROS_HOST_CMD,
- SCP_IPI_MAX,
};
+#define SCP_IPI_NS_SERVICE 0xFF
+#define SCP_IPI_MAX 0x100
+
/**
* scp_ipi_register - register an ipi function
*
diff --git a/include/linux/rpmsg/mtk_rpmsg.h b/include/linux/rpmsg/mtk_rpmsg.h
new file mode 100644
index 00000000000000..8d21cd3d35b012
--- /dev/null
+++ b/include/linux/rpmsg/mtk_rpmsg.h
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright 2018 Google LLC.
+ */
+
+#ifndef __LINUX_RPMSG_MTK_RPMSG_H
+#define __LINUX_RPMSG_MTK_RPMSG_H
+
+#include <linux/device.h>
+#include <linux/remoteproc.h>
+
+#if IS_ENABLED(CONFIG_RPMSG_MTK_SCP)
+
+struct rproc_subdev *
+mtk_rpmsg_create_rproc_subdev(struct platform_device *scp_pdev,
+ struct rproc *scp_rproc);
+
+void mtk_rpmsg_destroy_rproc_subdev(struct rproc_subdev *subdev);
+
+#else
+
+static inline struct rproc_subdev *
+mtk_rpmsg_create_rproc_subdev(struct platform_device *scp_pdev,
+ struct rproc *scp_rproc)
+{
+ return NULL;
+}
+
+static inline void mtk_rpmsg_destroy_rproc_subdev(struct rproc_subdev *subdev)
+{
+}
+
+#endif
+
+#endif
--
2.20.1.321.g9e740568ce-goog
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 5+ messages in thread