[PATCH v5 0/8] dmaengine: mmp_pdma: Add SpacemiT K1 SoC support with 64-bit addressing

[PATCH v5 0/8] dmaengine: mmp_pdma: Add SpacemiT K1 SoC support with 64-bit addressing

[Guodong Xu]

This patchset adds support for SpacemiT K1 PDMA controller to the existing
mmp_pdma driver. The K1 PDMA controller is compatible with Marvell MMP PDMA
but extends it with 64-bit addressing capabilities through LPAE (Long
Physical Address Extension) bit and higher 32-bit address registers (DDADRH,
DSADRH and DTADRH).

In v5, two smatch warnings reported by kernel test bot and Dan Carpenter were
fixed.

The patchset has been tested on BananaPi F3 board.

This patchset is based on v6.17-rc2, with patch 8 (defconfig) depending on:
 - riscv: defconfig: run savedefconfig to reorder it
Link: https://lore.kernel.org/all/20250611-01-riscv-defconfig-v1-1-b48fc3517498@gentoo.org/

All of these patches are available here:
https://github.com/docularxu/linux/tree/working_dma_0819

Changes in v5:
- Rebased to v6.17-rc2.
- Two variable dereference issues are fixed in patch 4.

Link to v4:
https://lore.kernel.org/r/20250815-working_dma_0701_v2-v4-0-62145ab6ea30@riscstar.com

Changes in v4:
- Rebased to v6.17-rc1.
- Updated commit messages in patch 2 and 3.
- Renamed the node from pdma0 to pdma.
- Put "interrupts" after "clocks" and "resets"

Link to v3:
https://lore.kernel.org/r/20250714-working_dma_0701_v2-v3-0-8b0f5cd71595@riscstar.com

Changes in v3:
- Created separated yaml binding for Spacemit K1 PDMA controller
- Updated pdma0 node properties according to the new yaml binding
- Put pdma0 node in k1.dtsi according to its device address
- Put pdma0 node in board dts files according to alphabetic order

Link to v2:
https://lore.kernel.org/r/20250701-working_dma_0701_v2-v2-0-ab6ee9171d26@riscstar.com

Changes in v2:
- Tag the series as "damengine".
- Used more specific compatible string "spacemit,k1-pdma"
- Enhanced DT bindings with conditional constraints:
   - clocks/resets properties only required for SpacemiT K1
   - #dma-cells set to 2 for marvell,pdma-1.0 and spacemit,k1-pdma
   - #dma-cells set to 1 for other variants
- Split mmp_pdma driver changes per maintainer feedback:
   - First patch (4/8) adds ops abstraction layer and 32-bit support
   - Second patch (5/8) adds K1-specific 64-bit support
- Merged Kconfig changes into the dmaengine: mmp_pdma driver patch (5/8)
- Enabled pdma0 on both BPI-F3 and Milk-V Jupiter

Link to v1:
https://lore.kernel.org/all/20250611125723.181711-1-guodong@riscstar.com/

Signed-off-by: Guodong Xu <guodong@riscstar.com>
Tested-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
---
Guodong Xu (8):
      dt-bindings: dma: Add SpacemiT K1 PDMA controller
      dmaengine: mmp_pdma: Add clock support
      dmaengine: mmp_pdma: Add reset controller support
      dmaengine: mmp_pdma: Add operations structure for controller abstraction
      dmaengine: mmp_pdma: Add SpacemiT K1 PDMA support with 64-bit addressing
      riscv: dts: spacemit: Add PDMA node for K1 SoC
      riscv: dts: spacemit: Enable PDMA on Banana Pi F3 and Milkv Jupiter
      riscv: defconfig: Enable MMP_PDMA support for SpacemiT K1 SoC

 .../devicetree/bindings/dma/spacemit,k1-pdma.yaml  |  68 +++++
 arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts    |   4 +
 arch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts  |   4 +
 arch/riscv/boot/dts/spacemit/k1.dtsi               |  11 +
 arch/riscv/configs/defconfig                       |   1 +
 drivers/dma/Kconfig                                |   2 +-
 drivers/dma/mmp_pdma.c                             | 289 ++++++++++++++++++---
 7 files changed, 343 insertions(+), 36 deletions(-)
---
base-commit: f3c5631f70e434e318c44001e2417d4770f06cd0
change-id: 20250701-working_dma_0701_v2-7d2cf506aad7
prerequisite-change-id: 20250611-01-riscv-defconfig-7f90f73d283d:v1
prerequisite-patch-id: 53bda77e089023a09152a7d5403e1a738355c5d3

Best regards,
-- 
Guodong Xu <guodong@riscstar.com>


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[PATCH v5 1/8] dt-bindings: dma: Add SpacemiT K1 PDMA controller

[Guodong Xu]

Add device tree binding documentation for the SpacemiT K1 PDMA
controller.

Signed-off-by: Guodong Xu <guodong@riscstar.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
---
v5: No change.
v4: Add Rob's reviewed-by.
v3: New patch.
---
 .../devicetree/bindings/dma/spacemit,k1-pdma.yaml  | 68 ++++++++++++++++++++++
 1 file changed, 68 insertions(+)

diff --git a/Documentation/devicetree/bindings/dma/spacemit,k1-pdma.yaml b/Documentation/devicetree/bindings/dma/spacemit,k1-pdma.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..ec06235baf5ca3ecffe7dba9bb425b242985660e
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/spacemit,k1-pdma.yaml
@@ -0,0 +1,68 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/spacemit,k1-pdma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SpacemiT K1 PDMA Controller
+
+maintainers:
+  - Guodong Xu <guodong@riscstar.com>
+
+allOf:
+  - $ref: dma-controller.yaml#
+
+properties:
+  compatible:
+    const: spacemit,k1-pdma
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    description: Shared interrupt for all DMA channels
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  dma-channels:
+    maximum: 16
+
+  '#dma-cells':
+    const: 1
+    description:
+      The DMA request number for the peripheral device.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - resets
+  - dma-channels
+  - '#dma-cells'
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/spacemit,k1-syscon.h>
+
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        dma-controller@d4000000 {
+            compatible = "spacemit,k1-pdma";
+            reg = <0x0 0xd4000000 0x0 0x4000>;
+            interrupts = <72>;
+            clocks = <&syscon_apmu CLK_DMA>;
+            resets = <&syscon_apmu RESET_DMA>;
+            dma-channels = <16>;
+            #dma-cells = <1>;
+        };
+    };

-- 
2.43.0


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[PATCH v5 2/8] dmaengine: mmp_pdma: Add clock support

[Guodong Xu]

Add support for retrieving and enabling an optional clock during
mmp_pdma_probe(). It is optional because in Marvell devices
such as "marvell,pdma-1.0" the clocks property is not a required
property. But in SpacemiT K1 PDMA, "spacemit,k1-pdma" as the dt
binding schema file stated, clocks is required.

Signed-off-by: Guodong Xu <guodong@riscstar.com>
---
v5: No change.
v4: Update the commit message, no source code change.
v3: No change.
v2: No change.
---
 drivers/dma/mmp_pdma.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/dma/mmp_pdma.c b/drivers/dma/mmp_pdma.c
index a95d31103d3063a1d11177a1a37b89ac2fd213e9..4a6dbf55823722d26cc69379d22aaa88fbe19313 100644
--- a/drivers/dma/mmp_pdma.c
+++ b/drivers/dma/mmp_pdma.c
@@ -15,6 +15,7 @@
 #include <linux/device.h>
 #include <linux/platform_data/mmp_dma.h>
 #include <linux/dmapool.h>
+#include <linux/clk.h>
 #include <linux/of_dma.h>
 #include <linux/of.h>
 
@@ -1019,6 +1020,7 @@ static int mmp_pdma_probe(struct platform_device *op)
 {
 	struct mmp_pdma_device *pdev;
 	struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev);
+	struct clk *clk;
 	int i, ret, irq = 0;
 	int dma_channels = 0, irq_num = 0;
 	const enum dma_slave_buswidth widths =
@@ -1037,6 +1039,10 @@ static int mmp_pdma_probe(struct platform_device *op)
 	if (IS_ERR(pdev->base))
 		return PTR_ERR(pdev->base);
 
+	clk = devm_clk_get_optional_enabled(pdev->dev, NULL);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
 	if (pdev->dev->of_node) {
 		/* Parse new and deprecated dma-channels properties */
 		if (of_property_read_u32(pdev->dev->of_node, "dma-channels",

-- 
2.43.0


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[PATCH v5 3/8] dmaengine: mmp_pdma: Add reset controller support

[Guodong Xu]

Add support to acquire and deassert an optional hardware reset controller
during mmp_pdma_probe(). It is optional because in Marvell devices
such as "marvell,pdma-1.0" the resets property is not a required
property. But in SpacemiT K1 PDMA, "spacemit,k1-pdma" as the dt
binding schema file stated, resets is required.

Signed-off-by: Guodong Xu <guodong@riscstar.com>
---
v5: No change.
v4: Updated the commit message, no source code change.
v3: No change.
v2: No change.
---
 drivers/dma/mmp_pdma.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/dma/mmp_pdma.c b/drivers/dma/mmp_pdma.c
index 4a6dbf55823722d26cc69379d22aaa88fbe19313..fe627efeaff07436647f86ab5ec5333144a3c92d 100644
--- a/drivers/dma/mmp_pdma.c
+++ b/drivers/dma/mmp_pdma.c
@@ -16,6 +16,7 @@
 #include <linux/platform_data/mmp_dma.h>
 #include <linux/dmapool.h>
 #include <linux/clk.h>
+#include <linux/reset.h>
 #include <linux/of_dma.h>
 #include <linux/of.h>
 
@@ -1021,6 +1022,7 @@ static int mmp_pdma_probe(struct platform_device *op)
 	struct mmp_pdma_device *pdev;
 	struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev);
 	struct clk *clk;
+	struct reset_control *rst;
 	int i, ret, irq = 0;
 	int dma_channels = 0, irq_num = 0;
 	const enum dma_slave_buswidth widths =
@@ -1043,6 +1045,11 @@ static int mmp_pdma_probe(struct platform_device *op)
 	if (IS_ERR(clk))
 		return PTR_ERR(clk);
 
+	rst = devm_reset_control_get_optional_exclusive_deasserted(pdev->dev,
+								   NULL);
+	if (IS_ERR(rst))
+		return PTR_ERR(rst);
+
 	if (pdev->dev->of_node) {
 		/* Parse new and deprecated dma-channels properties */
 		if (of_property_read_u32(pdev->dev->of_node, "dma-channels",

-- 
2.43.0


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[PATCH v5 4/8] dmaengine: mmp_pdma: Add operations structure for controller abstraction

[Guodong Xu]

Introduce mmp_pdma_ops structure to abstract 32-bit addressing operations
and enable support for different controller variants. This prepares for
adding 64-bit addressing support.

The ops structure includes:
- Hardware register operations (read/write DDADR, DSADR, DTADR)
- Descriptor memory operations (manipulate descriptor structs)
- Controller configuration (run bits, DMA mask)

Convert existing 32-bit operations to use the new abstraction layer
while maintaining backward compatibility.

Cc: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Guodong Xu <guodong@riscstar.com>
---
v5: Fixed dereference warnings reported by kernel test bot and Dan
    Carpenter.
v4: No change.
v3: No change.
v2: New patch, introduce mmp_pdma_ops for 32-bit addressing operations.
---
 drivers/dma/mmp_pdma.c | 195 ++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 160 insertions(+), 35 deletions(-)

diff --git a/drivers/dma/mmp_pdma.c b/drivers/dma/mmp_pdma.c
index fe627efeaff07436647f86ab5ec5333144a3c92d..38d1a4cdfd0e92e53c77b61caa1133559ef40dbd 100644
--- a/drivers/dma/mmp_pdma.c
+++ b/drivers/dma/mmp_pdma.c
@@ -25,7 +25,7 @@
 #define DCSR		0x0000
 #define DALGN		0x00a0
 #define DINT		0x00f0
-#define DDADR		0x0200
+#define DDADR(n)	(0x0200 + ((n) << 4))
 #define DSADR(n)	(0x0204 + ((n) << 4))
 #define DTADR(n)	(0x0208 + ((n) << 4))
 #define DCMD		0x020c
@@ -120,12 +120,55 @@ struct mmp_pdma_phy {
 	struct mmp_pdma_chan *vchan;
 };
 
+/**
+ * struct mmp_pdma_ops - Operations for the MMP PDMA controller
+ *
+ * Hardware Register Operations (read/write hardware registers):
+ * @write_next_addr: Function to program address of next descriptor into
+ *                   DDADR/DDADRH
+ * @read_src_addr: Function to read the source address from DSADR/DSADRH
+ * @read_dst_addr: Function to read the destination address from DTADR/DTADRH
+ *
+ * Descriptor Memory Operations (manipulate descriptor structs in memory):
+ * @set_desc_next_addr: Function to set next descriptor address in descriptor
+ * @set_desc_src_addr: Function to set the source address in descriptor
+ * @set_desc_dst_addr: Function to set the destination address in descriptor
+ * @get_desc_src_addr: Function to get the source address from descriptor
+ * @get_desc_dst_addr: Function to get the destination address from descriptor
+ *
+ * Controller Configuration:
+ * @run_bits:   Control bits in DCSR register for channel start/stop
+ * @dma_mask:   DMA addressing capability of controller. 0 to use OF/platform
+ *              settings, or explicit mask like DMA_BIT_MASK(32/64)
+ */
+struct mmp_pdma_ops {
+	/* Hardware Register Operations */
+	void (*write_next_addr)(struct mmp_pdma_phy *phy, dma_addr_t addr);
+	u64 (*read_src_addr)(struct mmp_pdma_phy *phy);
+	u64 (*read_dst_addr)(struct mmp_pdma_phy *phy);
+
+	/* Descriptor Memory Operations */
+	void (*set_desc_next_addr)(struct mmp_pdma_desc_hw *desc,
+				   dma_addr_t addr);
+	void (*set_desc_src_addr)(struct mmp_pdma_desc_hw *desc,
+				  dma_addr_t addr);
+	void (*set_desc_dst_addr)(struct mmp_pdma_desc_hw *desc,
+				  dma_addr_t addr);
+	u64 (*get_desc_src_addr)(const struct mmp_pdma_desc_hw *desc);
+	u64 (*get_desc_dst_addr)(const struct mmp_pdma_desc_hw *desc);
+
+	/* Controller Configuration */
+	u32 run_bits;
+	u64 dma_mask;
+};
+
 struct mmp_pdma_device {
 	int				dma_channels;
 	void __iomem			*base;
 	struct device			*dev;
 	struct dma_device		device;
 	struct mmp_pdma_phy		*phy;
+	const struct mmp_pdma_ops	*ops;
 	spinlock_t phy_lock; /* protect alloc/free phy channels */
 };
 
@@ -138,24 +181,61 @@ struct mmp_pdma_device {
 #define to_mmp_pdma_dev(dmadev)					\
 	container_of(dmadev, struct mmp_pdma_device, device)
 
-static int mmp_pdma_config_write(struct dma_chan *dchan,
-			   struct dma_slave_config *cfg,
-			   enum dma_transfer_direction direction);
+/* For 32-bit PDMA */
+static void write_next_addr_32(struct mmp_pdma_phy *phy, dma_addr_t addr)
+{
+	writel(addr, phy->base + DDADR(phy->idx));
+}
+
+static u64 read_src_addr_32(struct mmp_pdma_phy *phy)
+{
+	return readl(phy->base + DSADR(phy->idx));
+}
+
+static u64 read_dst_addr_32(struct mmp_pdma_phy *phy)
+{
+	return readl(phy->base + DTADR(phy->idx));
+}
+
+static void set_desc_next_addr_32(struct mmp_pdma_desc_hw *desc, dma_addr_t addr)
+{
+	desc->ddadr = addr;
+}
+
+static void set_desc_src_addr_32(struct mmp_pdma_desc_hw *desc, dma_addr_t addr)
+{
+	desc->dsadr = addr;
+}
 
-static void set_desc(struct mmp_pdma_phy *phy, dma_addr_t addr)
+static void set_desc_dst_addr_32(struct mmp_pdma_desc_hw *desc, dma_addr_t addr)
 {
-	u32 reg = (phy->idx << 4) + DDADR;
+	desc->dtadr = addr;
+}
 
-	writel(addr, phy->base + reg);
+static u64 get_desc_src_addr_32(const struct mmp_pdma_desc_hw *desc)
+{
+	return desc->dsadr;
 }
 
+static u64 get_desc_dst_addr_32(const struct mmp_pdma_desc_hw *desc)
+{
+	return desc->dtadr;
+}
+
+static int mmp_pdma_config_write(struct dma_chan *dchan,
+				 struct dma_slave_config *cfg,
+				 enum dma_transfer_direction direction);
+
 static void enable_chan(struct mmp_pdma_phy *phy)
 {
 	u32 reg, dalgn;
+	struct mmp_pdma_device *pdev;
 
 	if (!phy->vchan)
 		return;
 
+	pdev = to_mmp_pdma_dev(phy->vchan->chan.device);
+
 	reg = DRCMR(phy->vchan->drcmr);
 	writel(DRCMR_MAPVLD | phy->idx, phy->base + reg);
 
@@ -167,18 +247,29 @@ static void enable_chan(struct mmp_pdma_phy *phy)
 	writel(dalgn, phy->base + DALGN);
 
 	reg = (phy->idx << 2) + DCSR;
-	writel(readl(phy->base + reg) | DCSR_RUN, phy->base + reg);
+	writel(readl(phy->base + reg) | pdev->ops->run_bits,
+	       phy->base + reg);
 }
 
 static void disable_chan(struct mmp_pdma_phy *phy)
 {
-	u32 reg;
+	u32 reg, dcsr;
 
 	if (!phy)
 		return;
 
 	reg = (phy->idx << 2) + DCSR;
-	writel(readl(phy->base + reg) & ~DCSR_RUN, phy->base + reg);
+	dcsr = readl(phy->base + reg);
+
+	if (phy->vchan) {
+		struct mmp_pdma_device *pdev;
+
+		pdev = to_mmp_pdma_dev(phy->vchan->chan.device);
+		writel(dcsr & ~pdev->ops->run_bits, phy->base + reg);
+	} else {
+		/* If no vchan, just clear the RUN bit */
+		writel(dcsr & ~DCSR_RUN, phy->base + reg);
+	}
 }
 
 static int clear_chan_irq(struct mmp_pdma_phy *phy)
@@ -297,6 +388,7 @@ static void mmp_pdma_free_phy(struct mmp_pdma_chan *pchan)
 static void start_pending_queue(struct mmp_pdma_chan *chan)
 {
 	struct mmp_pdma_desc_sw *desc;
+	struct mmp_pdma_device *pdev = to_mmp_pdma_dev(chan->chan.device);
 
 	/* still in running, irq will start the pending list */
 	if (!chan->idle) {
@@ -331,7 +423,7 @@ static void start_pending_queue(struct mmp_pdma_chan *chan)
 	 * Program the descriptor's address into the DMA controller,
 	 * then start the DMA transaction
 	 */
-	set_desc(chan->phy, desc->async_tx.phys);
+	pdev->ops->write_next_addr(chan->phy, desc->async_tx.phys);
 	enable_chan(chan->phy);
 	chan->idle = false;
 }
@@ -447,15 +539,14 @@ mmp_pdma_prep_memcpy(struct dma_chan *dchan,
 		     size_t len, unsigned long flags)
 {
 	struct mmp_pdma_chan *chan;
+	struct mmp_pdma_device *pdev;
 	struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new;
 	size_t copy = 0;
 
-	if (!dchan)
-		return NULL;
-
-	if (!len)
+	if (!dchan || !len)
 		return NULL;
 
+	pdev = to_mmp_pdma_dev(dchan->device);
 	chan = to_mmp_pdma_chan(dchan);
 	chan->byte_align = false;
 
@@ -478,13 +569,14 @@ mmp_pdma_prep_memcpy(struct dma_chan *dchan,
 			chan->byte_align = true;
 
 		new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & copy);
-		new->desc.dsadr = dma_src;
-		new->desc.dtadr = dma_dst;
+		pdev->ops->set_desc_src_addr(&new->desc, dma_src);
+		pdev->ops->set_desc_dst_addr(&new->desc, dma_dst);
 
 		if (!first)
 			first = new;
 		else
-			prev->desc.ddadr = new->async_tx.phys;
+			pdev->ops->set_desc_next_addr(&prev->desc,
+						      new->async_tx.phys);
 
 		new->async_tx.cookie = 0;
 		async_tx_ack(&new->async_tx);
@@ -528,6 +620,7 @@ mmp_pdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
 		       unsigned long flags, void *context)
 {
 	struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
+	struct mmp_pdma_device *pdev = to_mmp_pdma_dev(dchan->device);
 	struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new = NULL;
 	size_t len, avail;
 	struct scatterlist *sg;
@@ -559,17 +652,18 @@ mmp_pdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
 
 			new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & len);
 			if (dir == DMA_MEM_TO_DEV) {
-				new->desc.dsadr = addr;
+				pdev->ops->set_desc_src_addr(&new->desc, addr);
 				new->desc.dtadr = chan->dev_addr;
 			} else {
 				new->desc.dsadr = chan->dev_addr;
-				new->desc.dtadr = addr;
+				pdev->ops->set_desc_dst_addr(&new->desc, addr);
 			}
 
 			if (!first)
 				first = new;
 			else
-				prev->desc.ddadr = new->async_tx.phys;
+				pdev->ops->set_desc_next_addr(&prev->desc,
+							   new->async_tx.phys);
 
 			new->async_tx.cookie = 0;
 			async_tx_ack(&new->async_tx);
@@ -609,12 +703,15 @@ mmp_pdma_prep_dma_cyclic(struct dma_chan *dchan,
 			 unsigned long flags)
 {
 	struct mmp_pdma_chan *chan;
+	struct mmp_pdma_device *pdev;
 	struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new;
 	dma_addr_t dma_src, dma_dst;
 
 	if (!dchan || !len || !period_len)
 		return NULL;
 
+	pdev = to_mmp_pdma_dev(dchan->device);
+
 	/* the buffer length must be a multiple of period_len */
 	if (len % period_len != 0)
 		return NULL;
@@ -651,13 +748,14 @@ mmp_pdma_prep_dma_cyclic(struct dma_chan *dchan,
 
 		new->desc.dcmd = (chan->dcmd | DCMD_ENDIRQEN |
 				  (DCMD_LENGTH & period_len));
-		new->desc.dsadr = dma_src;
-		new->desc.dtadr = dma_dst;
+		pdev->ops->set_desc_src_addr(&new->desc, dma_src);
+		pdev->ops->set_desc_dst_addr(&new->desc, dma_dst);
 
 		if (!first)
 			first = new;
 		else
-			prev->desc.ddadr = new->async_tx.phys;
+			pdev->ops->set_desc_next_addr(&prev->desc,
+						      new->async_tx.phys);
 
 		new->async_tx.cookie = 0;
 		async_tx_ack(&new->async_tx);
@@ -678,7 +776,7 @@ mmp_pdma_prep_dma_cyclic(struct dma_chan *dchan,
 	first->async_tx.cookie = -EBUSY;
 
 	/* make the cyclic link */
-	new->desc.ddadr = first->async_tx.phys;
+	pdev->ops->set_desc_next_addr(&new->desc, first->async_tx.phys);
 	chan->cyclic_first = first;
 
 	return &first->async_tx;
@@ -764,7 +862,9 @@ static unsigned int mmp_pdma_residue(struct mmp_pdma_chan *chan,
 				     dma_cookie_t cookie)
 {
 	struct mmp_pdma_desc_sw *sw;
-	u32 curr, residue = 0;
+	struct mmp_pdma_device *pdev = to_mmp_pdma_dev(chan->chan.device);
+	u64 curr;
+	u32 residue = 0;
 	bool passed = false;
 	bool cyclic = chan->cyclic_first != NULL;
 
@@ -776,17 +876,18 @@ static unsigned int mmp_pdma_residue(struct mmp_pdma_chan *chan,
 		return 0;
 
 	if (chan->dir == DMA_DEV_TO_MEM)
-		curr = readl(chan->phy->base + DTADR(chan->phy->idx));
+		curr = pdev->ops->read_dst_addr(chan->phy);
 	else
-		curr = readl(chan->phy->base + DSADR(chan->phy->idx));
+		curr = pdev->ops->read_src_addr(chan->phy);
 
 	list_for_each_entry(sw, &chan->chain_running, node) {
-		u32 start, end, len;
+		u64 start, end;
+		u32 len;
 
 		if (chan->dir == DMA_DEV_TO_MEM)
-			start = sw->desc.dtadr;
+			start = pdev->ops->get_desc_dst_addr(&sw->desc);
 		else
-			start = sw->desc.dsadr;
+			start = pdev->ops->get_desc_src_addr(&sw->desc);
 
 		len = sw->desc.dcmd & DCMD_LENGTH;
 		end = start + len;
@@ -802,7 +903,7 @@ static unsigned int mmp_pdma_residue(struct mmp_pdma_chan *chan,
 		if (passed) {
 			residue += len;
 		} else if (curr >= start && curr <= end) {
-			residue += end - curr;
+			residue += (u32)(end - curr);
 			passed = true;
 		}
 
@@ -996,9 +1097,26 @@ static int mmp_pdma_chan_init(struct mmp_pdma_device *pdev, int idx, int irq)
 	return 0;
 }
 
+static const struct mmp_pdma_ops marvell_pdma_v1_ops = {
+	.write_next_addr = write_next_addr_32,
+	.read_src_addr = read_src_addr_32,
+	.read_dst_addr = read_dst_addr_32,
+	.set_desc_next_addr = set_desc_next_addr_32,
+	.set_desc_src_addr = set_desc_src_addr_32,
+	.set_desc_dst_addr = set_desc_dst_addr_32,
+	.get_desc_src_addr = get_desc_src_addr_32,
+	.get_desc_dst_addr = get_desc_dst_addr_32,
+	.run_bits = (DCSR_RUN),
+	.dma_mask = 0,			/* let OF/platform set DMA mask */
+};
+
 static const struct of_device_id mmp_pdma_dt_ids[] = {
-	{ .compatible = "marvell,pdma-1.0", },
-	{}
+	{
+		.compatible = "marvell,pdma-1.0",
+		.data = &marvell_pdma_v1_ops
+	}, {
+		/* sentinel */
+	}
 };
 MODULE_DEVICE_TABLE(of, mmp_pdma_dt_ids);
 
@@ -1050,6 +1168,10 @@ static int mmp_pdma_probe(struct platform_device *op)
 	if (IS_ERR(rst))
 		return PTR_ERR(rst);
 
+	pdev->ops = of_device_get_match_data(&op->dev);
+	if (!pdev->ops)
+		return -ENODEV;
+
 	if (pdev->dev->of_node) {
 		/* Parse new and deprecated dma-channels properties */
 		if (of_property_read_u32(pdev->dev->of_node, "dma-channels",
@@ -1111,7 +1233,10 @@ static int mmp_pdma_probe(struct platform_device *op)
 	pdev->device.directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);
 	pdev->device.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
 
-	if (pdev->dev->coherent_dma_mask)
+	/* Set DMA mask based on ops->dma_mask, or OF/platform */
+	if (pdev->ops->dma_mask)
+		dma_set_mask(pdev->dev, pdev->ops->dma_mask);
+	else if (pdev->dev->coherent_dma_mask)
 		dma_set_mask(pdev->dev, pdev->dev->coherent_dma_mask);
 	else
 		dma_set_mask(pdev->dev, DMA_BIT_MASK(64));

-- 
2.43.0


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[PATCH v5 5/8] dmaengine: mmp_pdma: Add SpacemiT K1 PDMA support with 64-bit addressing

[Guodong Xu]

Add support for SpacemiT K1 PDMA controller which features 64-bit
addressing capabilities.

The SpacemiT K1 PDMA extends the descriptor format with additional
32-bit words for high address bits, enabling access to memory beyond
4GB boundaries. The new spacemit_k1_pdma_ops provides necessary 64-bit
address handling functions and k1 specific controller configurations.

Key changes:
- Add ARCH_SPACEMIT dependency to Kconfig
- Define new high 32-bit address registers (DDADRH, DSADRH, DTADRH)
- Add DCSR_LPAEEN bit for Long Physical Address Extension Enable
- Implement 64-bit operations for SpacemiT K1 PDMA

Signed-off-by: Guodong Xu <guodong@riscstar.com>
---
v5: No change.
v4: No change.
v3: No change.
v2: New patch.
  - Implement 64-bit addrssing support to mmp_pdma
  - Add support for SpacemiT K1 PDMA
  - Extend the MMP_PDMA entry in Kconfig to depend on ARCH_SPACEMIT
---
 drivers/dma/Kconfig    |  2 +-
 drivers/dma/mmp_pdma.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 82 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 05c7c7d9e5a4e52a8ad7ada8c8b9b1a6f9d875f6..b8a74b1798ba1d44b26553990428c065de6fc535 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -450,7 +450,7 @@ config MILBEAUT_XDMAC
 
 config MMP_PDMA
 	tristate "MMP PDMA support"
-	depends on ARCH_MMP || ARCH_PXA || COMPILE_TEST
+	depends on ARCH_MMP || ARCH_PXA || ARCH_SPACEMIT || COMPILE_TEST
 	select DMA_ENGINE
 	help
 	  Support the MMP PDMA engine for PXA and MMP platform.
diff --git a/drivers/dma/mmp_pdma.c b/drivers/dma/mmp_pdma.c
index 38d1a4cdfd0e92e53c77b61caa1133559ef40dbd..d07229a748868b8115892c63c54c16130d88e326 100644
--- a/drivers/dma/mmp_pdma.c
+++ b/drivers/dma/mmp_pdma.c
@@ -28,6 +28,9 @@
 #define DDADR(n)	(0x0200 + ((n) << 4))
 #define DSADR(n)	(0x0204 + ((n) << 4))
 #define DTADR(n)	(0x0208 + ((n) << 4))
+#define DDADRH(n)	(0x0300 + ((n) << 4))
+#define DSADRH(n)	(0x0304 + ((n) << 4))
+#define DTADRH(n)	(0x0308 + ((n) << 4))
 #define DCMD		0x020c
 
 #define DCSR_RUN	BIT(31)	/* Run Bit (read / write) */
@@ -44,6 +47,7 @@
 #define DCSR_EORSTOPEN	BIT(26)	/* STOP on an EOR */
 #define DCSR_SETCMPST	BIT(25)	/* Set Descriptor Compare Status */
 #define DCSR_CLRCMPST	BIT(24)	/* Clear Descriptor Compare Status */
+#define DCSR_LPAEEN	BIT(21)	/* Long Physical Address Extension Enable */
 #define DCSR_CMPST	BIT(10)	/* The Descriptor Compare Status */
 #define DCSR_EORINTR	BIT(9)	/* The end of Receive */
 
@@ -76,6 +80,16 @@ struct mmp_pdma_desc_hw {
 	u32 dsadr;	/* DSADR value for the current transfer */
 	u32 dtadr;	/* DTADR value for the current transfer */
 	u32 dcmd;	/* DCMD value for the current transfer */
+	/*
+	 * The following 32-bit words are only used in the 64-bit, ie.
+	 * LPAE (Long Physical Address Extension) mode.
+	 * They are used to specify the high 32 bits of the descriptor's
+	 * addresses.
+	 */
+	u32 ddadrh;	/* High 32-bit of DDADR */
+	u32 dsadrh;	/* High 32-bit of DSADR */
+	u32 dtadrh;	/* High 32-bit of DTADR */
+	u32 rsvd;	/* reserved */
 } __aligned(32);
 
 struct mmp_pdma_desc_sw {
@@ -222,6 +236,57 @@ static u64 get_desc_dst_addr_32(const struct mmp_pdma_desc_hw *desc)
 	return desc->dtadr;
 }
 
+/* For 64-bit PDMA */
+static void write_next_addr_64(struct mmp_pdma_phy *phy, dma_addr_t addr)
+{
+	writel(lower_32_bits(addr), phy->base + DDADR(phy->idx));
+	writel(upper_32_bits(addr), phy->base + DDADRH(phy->idx));
+}
+
+static u64 read_src_addr_64(struct mmp_pdma_phy *phy)
+{
+	u32 low = readl(phy->base + DSADR(phy->idx));
+	u32 high = readl(phy->base + DSADRH(phy->idx));
+
+	return ((u64)high << 32) | low;
+}
+
+static u64 read_dst_addr_64(struct mmp_pdma_phy *phy)
+{
+	u32 low = readl(phy->base + DTADR(phy->idx));
+	u32 high = readl(phy->base + DTADRH(phy->idx));
+
+	return ((u64)high << 32) | low;
+}
+
+static void set_desc_next_addr_64(struct mmp_pdma_desc_hw *desc, dma_addr_t addr)
+{
+	desc->ddadr = lower_32_bits(addr);
+	desc->ddadrh = upper_32_bits(addr);
+}
+
+static void set_desc_src_addr_64(struct mmp_pdma_desc_hw *desc, dma_addr_t addr)
+{
+	desc->dsadr = lower_32_bits(addr);
+	desc->dsadrh = upper_32_bits(addr);
+}
+
+static void set_desc_dst_addr_64(struct mmp_pdma_desc_hw *desc, dma_addr_t addr)
+{
+	desc->dtadr = lower_32_bits(addr);
+	desc->dtadrh = upper_32_bits(addr);
+}
+
+static u64 get_desc_src_addr_64(const struct mmp_pdma_desc_hw *desc)
+{
+	return ((u64)desc->dsadrh << 32) | desc->dsadr;
+}
+
+static u64 get_desc_dst_addr_64(const struct mmp_pdma_desc_hw *desc)
+{
+	return ((u64)desc->dtadrh << 32) | desc->dtadr;
+}
+
 static int mmp_pdma_config_write(struct dma_chan *dchan,
 				 struct dma_slave_config *cfg,
 				 enum dma_transfer_direction direction);
@@ -1110,10 +1175,26 @@ static const struct mmp_pdma_ops marvell_pdma_v1_ops = {
 	.dma_mask = 0,			/* let OF/platform set DMA mask */
 };
 
+static const struct mmp_pdma_ops spacemit_k1_pdma_ops = {
+	.write_next_addr = write_next_addr_64,
+	.read_src_addr = read_src_addr_64,
+	.read_dst_addr = read_dst_addr_64,
+	.set_desc_next_addr = set_desc_next_addr_64,
+	.set_desc_src_addr = set_desc_src_addr_64,
+	.set_desc_dst_addr = set_desc_dst_addr_64,
+	.get_desc_src_addr = get_desc_src_addr_64,
+	.get_desc_dst_addr = get_desc_dst_addr_64,
+	.run_bits = (DCSR_RUN | DCSR_LPAEEN),
+	.dma_mask = DMA_BIT_MASK(64),	/* force 64-bit DMA addr capability */
+};
+
 static const struct of_device_id mmp_pdma_dt_ids[] = {
 	{
 		.compatible = "marvell,pdma-1.0",
 		.data = &marvell_pdma_v1_ops
+	}, {
+		.compatible = "spacemit,k1-pdma",
+		.data = &spacemit_k1_pdma_ops
 	}, {
 		/* sentinel */
 	}

-- 
2.43.0


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[PATCH v5 6/8] riscv: dts: spacemit: Add PDMA node for K1 SoC

[Guodong Xu]

Add PDMA dma-controller node under dma_bus for SpacemiT K1 SoC.

The PDMA node is marked as disabled by default, allowing board-specific
device trees to enable it as needed.

Signed-off-by: Guodong Xu <guodong@riscstar.com>
Reviewed-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
---
v5:
- Add reviewed-by from Troy.
v4:
- Rename the node from pdma0 to pdma
- For consistnecy, put the "interrupts" after "clocks" and "resets"
v3:
- Adjust pdma0 position, ordering by device address
- Update properties according to the newly created schema binding
v2:
- Updated the compatible string.
- Rebased. Part of the changes in v1 is now in this patchset:
   - "riscv: dts: spacemit: Add DMA translation buses for K1"
   - Link: https://lore.kernel.org/all/20250623-k1-dma-buses-rfc-wip-v1-0-c0144082061f@iscas.ac.cn/
---
 arch/riscv/boot/dts/spacemit/k1.dtsi | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/riscv/boot/dts/spacemit/k1.dtsi b/arch/riscv/boot/dts/spacemit/k1.dtsi
index abde8bb07c95c5a745736a2dd6f0c0e0d7c696e4..861f0fe18083fa158da51bd3be2808609f6233f4 100644
--- a/arch/riscv/boot/dts/spacemit/k1.dtsi
+++ b/arch/riscv/boot/dts/spacemit/k1.dtsi
@@ -660,6 +660,17 @@ dma-bus {
 			dma-ranges = <0x0 0x00000000 0x0 0x00000000 0x0 0x80000000>,
 				     <0x1 0x00000000 0x1 0x80000000 0x3 0x00000000>;
 
+			pdma: dma-controller@d4000000 {
+				compatible = "spacemit,k1-pdma";
+				reg = <0x0 0xd4000000 0x0 0x4000>;
+				clocks = <&syscon_apmu CLK_DMA>;
+				resets = <&syscon_apmu RESET_DMA>;
+				interrupts = <72>;
+				dma-channels = <16>;
+				#dma-cells= <1>;
+				status = "disabled";
+			};
+
 			uart0: serial@d4017000 {
 				compatible = "spacemit,k1-uart",
 					     "intel,xscale-uart";

-- 
2.43.0


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[PATCH v5 7/8] riscv: dts: spacemit: Enable PDMA on Banana Pi F3 and Milkv Jupiter

[Guodong Xu]

Enable the PDMA on the SpacemiT K1-based Banana Pi F3 and Milkv Jupiter
boards by setting its status to "okay".

Signed-off-by: Guodong Xu <guodong@riscstar.com>
---
v5: No change.
v4: Rename the node from pdma0 to pdma
v3: Adjust pdma0 position, ordering by name alphabetic
v2: Added pdma0 enablement on Milkv Jupiter
---
 arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts   | 4 ++++
 arch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts b/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
index fe22c747c5012fe56d42ac8a7efdbbdb694f31b6..6013be25854283a95e630098c1fde55e33e08018 100644
--- a/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
+++ b/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
@@ -40,6 +40,10 @@ &emmc {
 	status = "okay";
 };
 
+&pdma {
+	status = "okay";
+};
+
 &uart0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart0_2_cfg>;
diff --git a/arch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts b/arch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts
index 4483192141049caa201c093fb206b6134a064f42..c615fcadbd333adc749b758f7f814126783f87fb 100644
--- a/arch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts
+++ b/arch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts
@@ -20,6 +20,10 @@ chosen {
 	};
 };
 
+&pdma {
+	status = "okay";
+};
+
 &uart0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart0_2_cfg>;

-- 
2.43.0


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[PATCH v5 8/8] riscv: defconfig: Enable MMP_PDMA support for SpacemiT K1 SoC

[Guodong Xu]

Enable CONFIG_MMP_PDMA in the riscv defconfig for SpacemiT K1 SoC boards.

Signed-off-by: Guodong Xu <guodong@riscstar.com>
---
v5: No change.
v4: No change.
v3: No change.
v2: Rebased. Part of the modification in v1 is now in this patch:
     - "riscv: defconfig: run savedefconfig to reorder it"
        , which has been merged into riscv/linux.git (for-next)
     - Link: https://git.kernel.org/riscv/c/d958097bdf88
---
 arch/riscv/configs/defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/riscv/configs/defconfig b/arch/riscv/configs/defconfig
index f25394d088d0d3cbee41fa9fb553c71e495036fd..b9ef2da15fb22f08bdb5ee5d1bba9f6eed49ff97 100644
--- a/arch/riscv/configs/defconfig
+++ b/arch/riscv/configs/defconfig
@@ -241,6 +241,7 @@ CONFIG_RTC_DRV_SUN6I=y
 CONFIG_DMADEVICES=y
 CONFIG_DMA_SUN6I=m
 CONFIG_DW_AXI_DMAC=y
+CONFIG_MMP_PDMA=m
 CONFIG_VIRTIO_PCI=y
 CONFIG_VIRTIO_BALLOON=y
 CONFIG_VIRTIO_INPUT=y

-- 
2.43.0


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Re: (subset) [PATCH v5 0/8] dmaengine: mmp_pdma: Add SpacemiT K1 SoC support with 64-bit addressing

[Vinod Koul]

On Fri, 22 Aug 2025 11:06:26 +0800, Guodong Xu wrote:
> This patchset adds support for SpacemiT K1 PDMA controller to the existing
> mmp_pdma driver. The K1 PDMA controller is compatible with Marvell MMP PDMA
> but extends it with 64-bit addressing capabilities through LPAE (Long
> Physical Address Extension) bit and higher 32-bit address registers (DDADRH,
> DSADRH and DTADRH).
> 
> In v5, two smatch warnings reported by kernel test bot and Dan Carpenter were
> fixed.
> 
> [...]

Applied, thanks!

[1/8] dt-bindings: dma: Add SpacemiT K1 PDMA controller
      commit: 39ce725e621b256188550492b4b53fb02bfc872e
[2/8] dmaengine: mmp_pdma: Add clock support
      commit: e73a9a13c99c5a55abfdb8c273651509be1eb5bb
[3/8] dmaengine: mmp_pdma: Add reset controller support
      commit: fc72462bc6107b8babda05cad5bf8f7daf8bec20
[4/8] dmaengine: mmp_pdma: Add operations structure for controller abstraction
      commit: 35e40bf761fcb24b1355d6a8d48b5b10683fe1a3
[5/8] dmaengine: mmp_pdma: Add SpacemiT K1 PDMA support with 64-bit addressing
      commit: 5cfe585d8624f7482505183dd0e4c534b061e822

Best regards,
-- 
~Vinod



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Re: (subset) [PATCH v5 0/8] dmaengine: mmp_pdma: Add SpacemiT K1 SoC support with 64-bit addressing

[Yixun Lan]

On Fri, 22 Aug 2025 11:06:26 +0800, Guodong Xu wrote:
> This patchset adds support for SpacemiT K1 PDMA controller to the existing
> mmp_pdma driver. The K1 PDMA controller is compatible with Marvell MMP PDMA
> but extends it with 64-bit addressing capabilities through LPAE (Long
> Physical Address Extension) bit and higher 32-bit address registers (DDADRH,
> DSADRH and DTADRH).
> 
> In v5, two smatch warnings reported by kernel test bot and Dan Carpenter were
> fixed.
> 
> [...]

Applied, thanks!

[6/8] riscv: dts: spacemit: Add PDMA node for K1 SoC
      https://github.com/spacemit-com/linux/commit/81d79ad0ddcaeaf6136abe870b2386bde31b7ed4
[7/8] riscv: dts: spacemit: Enable PDMA on Banana Pi F3 and Milkv Jupiter
      https://github.com/spacemit-com/linux/commit/0e28eab0ca51282e3d14f3e2dba9fc92e3fddbe6

Best regards,
-- 
Yixun Lan


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