[PATCH v4 0/4] Add support for STM32 DMA

[PATCH v4 0/4] Add support for STM32 DMA

[M'boumba Cedric Madianga]

This patchset adds support for the STM32 DMA controller.
This controller provides 8 channels dedicated to managing memory access
request from one or more peripherals.
Each stream can have up to 8 requests in total.

Changes since v3:
 - Fix regression introduced in v3 during request channel
 - Fix regression introduced in v3 for cyclic mode dma transfer
 - update interrupt description in DT
 - remove half transfer interrupt management as client callback as to be
   called only for complete transfer

Changes since v2:
 - remove interrupt configuration management from DT (Mark)
 - remove FIFO configuration management from DT except threshold as it is very
   hard to handle it in the driver due to many possible combinations according
   to burst and bus width (Mark)
 - update DMA client message in DT documentation file
 - specify the order to be used to set per-channel DMA interrupts in the DT
   (Mark)
 - remove unused enumerations for channel and request ids (Daniel)
 - keep as soon as possible 80 lines char for more readability (Vinod)
 - replace unsigned int by u32 (Vinod)
 - use GFP_NOWAIT instead of GFP_ATOMIC during dma descriptors allocation
   (Vinod)
 - return error if burst is not supported in stm32_dma_get_burst() (Vinod)
 - return error if bus_width is not supported in stm32_dma_get_width() (Vinod)
 - add FIFO configuration management inside the driver except for threshold
 - add interrupt configuration management inside the driver (Mark)
 - rework stm32_dma_chan_irq() to handle error interrupt in one way (Vinod)
 - rework stm32_dma_set_xfer_param() to be easier to read
 - update stm32_dma_tx_status() to always return status from dma_cookie_status() (Vinod)
 - disable clk if we don't manage to stop the DMA channel during channel
   resources allocation (Daniel)
 - set driver as built-in as DMA will be required by other built-in driver

 Changes since v1:
  - remove dmamux boolean as it is not needed
  - replace dma by DMA in Kconfig (Maxime)
  - add default return value in stm32_dma_get_width()
  - add defalut return value in stm32_dma_get_burst()
  - use lower case for constant hexadecimal values (Maxime)

M'boumba Cedric Madianga (4):
  dt-bindings: Document the STM32 DMA bindings
  dmaengine: Add STM32 DMA driver
  ARM: dts: Add STM32 DMA support for STM32F429 MCU
  ARM: configs: Add STM32 DMA support in STM32 defconfig

 .../devicetree/bindings/dma/stm32-dma.txt          |   82 ++
 arch/arm/boot/dts/stm32f429.dtsi                   |   31 +
 arch/arm/configs/stm32_defconfig                   |    2 +
 drivers/dma/Kconfig                                |   12 +
 drivers/dma/Makefile                               |    1 +
 drivers/dma/stm32-dma.c                            | 1141 ++++++++++++++++++++
 6 files changed, 1269 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/stm32-dma.txt
 create mode 100644 drivers/dma/stm32-dma.c

-- 
1.9.1

[PATCH v4 0/4] Add support for STM32 DMA

[M'boumba Cedric Madianga]

This patchset adds support for the STM32 DMA controller.
This controller provides 8 channels dedicated to managing memory access
request from one or more peripherals.
Each stream can have up to 8 requests in total.

Changes since v3:
 - Fix regression introduced in v3 during request channel
 - Fix regression introduced in v3 for cyclic mode dma transfer
 - update interrupt description in DT
 - remove half transfer interrupt management as client callback as to be
   called only for complete transfer

Changes since v2:
 - remove interrupt configuration management from DT (Mark)
 - remove FIFO configuration management from DT except threshold as it is very
   hard to handle it in the driver due to many possible combinations according
   to burst and bus width (Mark)
 - update DMA client message in DT documentation file
 - specify the order to be used to set per-channel DMA interrupts in the DT
   (Mark)
 - remove unused enumerations for channel and request ids (Daniel)
 - keep as soon as possible 80 lines char for more readability (Vinod)
 - replace unsigned int by u32 (Vinod)
 - use GFP_NOWAIT instead of GFP_ATOMIC during dma descriptors allocation
   (Vinod)
 - return error if burst is not supported in stm32_dma_get_burst() (Vinod)
 - return error if bus_width is not supported in stm32_dma_get_width() (Vinod)
 - add FIFO configuration management inside the driver except for threshold
 - add interrupt configuration management inside the driver (Mark)
 - rework stm32_dma_chan_irq() to handle error interrupt in one way (Vinod)
 - rework stm32_dma_set_xfer_param() to be easier to read
 - update stm32_dma_tx_status() to always return status from dma_cookie_status() (Vinod)
 - disable clk if we don't manage to stop the DMA channel during channel
   resources allocation (Daniel)
 - set driver as built-in as DMA will be required by other built-in driver

 Changes since v1:
  - remove dmamux boolean as it is not needed
  - replace dma by DMA in Kconfig (Maxime)
  - add default return value in stm32_dma_get_width()
  - add defalut return value in stm32_dma_get_burst()
  - use lower case for constant hexadecimal values (Maxime)

M'boumba Cedric Madianga (4):
  dt-bindings: Document the STM32 DMA bindings
  dmaengine: Add STM32 DMA driver
  ARM: dts: Add STM32 DMA support for STM32F429 MCU
  ARM: configs: Add STM32 DMA support in STM32 defconfig

 .../devicetree/bindings/dma/stm32-dma.txt          |   82 ++
 arch/arm/boot/dts/stm32f429.dtsi                   |   31 +
 arch/arm/configs/stm32_defconfig                   |    2 +
 drivers/dma/Kconfig                                |   12 +
 drivers/dma/Makefile                               |    1 +
 drivers/dma/stm32-dma.c                            | 1141 ++++++++++++++++++++
 6 files changed, 1269 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/stm32-dma.txt
 create mode 100644 drivers/dma/stm32-dma.c

-- 
1.9.1

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[PATCH v4 0/4] Add support for STM32 DMA

[M'boumba Cedric Madianga]

This patchset adds support for the STM32 DMA controller.
This controller provides 8 channels dedicated to managing memory access
request from one or more peripherals.
Each stream can have up to 8 requests in total.

Changes since v3:
 - Fix regression introduced in v3 during request channel
 - Fix regression introduced in v3 for cyclic mode dma transfer
 - update interrupt description in DT
 - remove half transfer interrupt management as client callback as to be
   called only for complete transfer

Changes since v2:
 - remove interrupt configuration management from DT (Mark)
 - remove FIFO configuration management from DT except threshold as it is very
   hard to handle it in the driver due to many possible combinations according
   to burst and bus width (Mark)
 - update DMA client message in DT documentation file
 - specify the order to be used to set per-channel DMA interrupts in the DT
   (Mark)
 - remove unused enumerations for channel and request ids (Daniel)
 - keep as soon as possible 80 lines char for more readability (Vinod)
 - replace unsigned int by u32 (Vinod)
 - use GFP_NOWAIT instead of GFP_ATOMIC during dma descriptors allocation
   (Vinod)
 - return error if burst is not supported in stm32_dma_get_burst() (Vinod)
 - return error if bus_width is not supported in stm32_dma_get_width() (Vinod)
 - add FIFO configuration management inside the driver except for threshold
 - add interrupt configuration management inside the driver (Mark)
 - rework stm32_dma_chan_irq() to handle error interrupt in one way (Vinod)
 - rework stm32_dma_set_xfer_param() to be easier to read
 - update stm32_dma_tx_status() to always return status from dma_cookie_status() (Vinod)
 - disable clk if we don't manage to stop the DMA channel during channel
   resources allocation (Daniel)
 - set driver as built-in as DMA will be required by other built-in driver

 Changes since v1:
  - remove dmamux boolean as it is not needed
  - replace dma by DMA in Kconfig (Maxime)
  - add default return value in stm32_dma_get_width()
  - add defalut return value in stm32_dma_get_burst()
  - use lower case for constant hexadecimal values (Maxime)

M'boumba Cedric Madianga (4):
  dt-bindings: Document the STM32 DMA bindings
  dmaengine: Add STM32 DMA driver
  ARM: dts: Add STM32 DMA support for STM32F429 MCU
  ARM: configs: Add STM32 DMA support in STM32 defconfig

 .../devicetree/bindings/dma/stm32-dma.txt          |   82 ++
 arch/arm/boot/dts/stm32f429.dtsi                   |   31 +
 arch/arm/configs/stm32_defconfig                   |    2 +
 drivers/dma/Kconfig                                |   12 +
 drivers/dma/Makefile                               |    1 +
 drivers/dma/stm32-dma.c                            | 1141 ++++++++++++++++++++
 6 files changed, 1269 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/stm32-dma.txt
 create mode 100644 drivers/dma/stm32-dma.c

-- 
1.9.1

[PATCH v4 1/4] dt-bindings: Document the STM32 DMA bindings

[M'boumba Cedric Madianga]

This patch adds documentation of device tree bindings for the STM32 dma
controller.

Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
---
 .../devicetree/bindings/dma/stm32-dma.txt          | 82 ++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/stm32-dma.txt

diff --git a/Documentation/devicetree/bindings/dma/stm32-dma.txt b/Documentation/devicetree/bindings/dma/stm32-dma.txt
new file mode 100644
index 0000000..70cd13f
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/stm32-dma.txt
@@ -0,0 +1,82 @@
+* STMicroelectronics STM32 DMA controller
+
+The STM32 DMA is a general-purpose direct memory access controller capable of
+supporting 8 independent DMA channels. Each channel can have up to 8 requests.
+
+Required properties:
+- compatible: Should be "st,stm32-dma"
+- reg: Should contain DMA registers location and length. This should include
+  all of the per-channel registers.
+- interrupts: Should contain all of the per-channel DMA interrupts in
+  ascending order with respect to the DMA channel index.
+- clocks: Should contain the input clock of the DMA instance.
+- #dma-cells : Must be <4>. See DMA client paragraph for more details.
+
+Optional properties:
+- resets: Reference to a reset controller asserting the DMA controller
+- st,mem2mem: boolean; if defined, it indicates that the controller supports
+  memory-to-memory transfer
+
+Example:
+
+	dma2: dma-controller@40026400 {
+		compatible = "st,stm32-dma";
+		reg = <0x40026400 0x400>;
+		interrupts = <56>,
+			     <57>,
+			     <58>,
+			     <59>,
+			     <60>,
+			     <68>,
+			     <69>,
+			     <70>;
+		clocks = <&clk_hclk>;
+		#dma-cells = <4>;
+		st,mem2mem;
+		resets = <&rcc 150>;
+	};
+
+* DMA client
+
+DMA clients connected to the STM32 DMA controller must use the format
+described in the dma.txt file, using a five-cell specifier for each
+channel: a phandle plus four integer cells.
+The four cells in order are:
+
+1. The channel id
+2. The request line number
+3. A 32bit mask specifying the DMA channel configuration which are device
+   dependent:
+  -bit 9: Peripheral Increment Address
+	0x0: no address increment between transfers
+	0x1: increment address between transfers
+ -bit 10: Memory Increment Address
+	0x0: no address increment between transfers
+	0x1: increment address between transfers
+ -bit 15: Peripheral Increment Offset Size
+	0x0: offset size is linked to the peripheral bus width
+	0x1: offset size is fixed to 4 (32-bit alignment)
+ -bit 16-17: Priority level
+	0x0: low
+	0x1: medium
+	0x2: high
+	0x3: very high
+5. A 32bit mask specifying the DMA FIFO threshold configuration which are device
+   dependent:
+ -bit 0-1: Fifo threshold
+	0x0: 1/4 full FIFO
+	0x1: 1/2 full FIFO
+	0x2: 3/4 full FIFO
+	0x3: full FIFO
+
+Example:
+
+	usart1: serial@40011000 {
+		compatible = "st,stm32-usart", "st,stm32-uart";
+		reg = <0x40011000 0x400>;
+		interrupts = <37>;
+		clocks = <&clk_pclk2>;
+		dmas = <&dma2 2 4 0x10400 0x3>,
+		       <&dma2 7 5 0x10200 0x3>;
+		dma-names = "rx", "tx";
+	};
-- 
1.9.1

[PATCH v4 1/4] dt-bindings: Document the STM32 DMA bindings

[M'boumba Cedric Madianga]

This patch adds documentation of device tree bindings for the STM32 dma
controller.

Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
---
 .../devicetree/bindings/dma/stm32-dma.txt          | 82 ++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/stm32-dma.txt

diff --git a/Documentation/devicetree/bindings/dma/stm32-dma.txt b/Documentation/devicetree/bindings/dma/stm32-dma.txt
new file mode 100644
index 0000000..70cd13f
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/stm32-dma.txt
@@ -0,0 +1,82 @@
+* STMicroelectronics STM32 DMA controller
+
+The STM32 DMA is a general-purpose direct memory access controller capable of
+supporting 8 independent DMA channels. Each channel can have up to 8 requests.
+
+Required properties:
+- compatible: Should be "st,stm32-dma"
+- reg: Should contain DMA registers location and length. This should include
+  all of the per-channel registers.
+- interrupts: Should contain all of the per-channel DMA interrupts in
+  ascending order with respect to the DMA channel index.
+- clocks: Should contain the input clock of the DMA instance.
+- #dma-cells : Must be <4>. See DMA client paragraph for more details.
+
+Optional properties:
+- resets: Reference to a reset controller asserting the DMA controller
+- st,mem2mem: boolean; if defined, it indicates that the controller supports
+  memory-to-memory transfer
+
+Example:
+
+	dma2: dma-controller at 40026400 {
+		compatible = "st,stm32-dma";
+		reg = <0x40026400 0x400>;
+		interrupts = <56>,
+			     <57>,
+			     <58>,
+			     <59>,
+			     <60>,
+			     <68>,
+			     <69>,
+			     <70>;
+		clocks = <&clk_hclk>;
+		#dma-cells = <4>;
+		st,mem2mem;
+		resets = <&rcc 150>;
+	};
+
+* DMA client
+
+DMA clients connected to the STM32 DMA controller must use the format
+described in the dma.txt file, using a five-cell specifier for each
+channel: a phandle plus four integer cells.
+The four cells in order are:
+
+1. The channel id
+2. The request line number
+3. A 32bit mask specifying the DMA channel configuration which are device
+   dependent:
+  -bit 9: Peripheral Increment Address
+	0x0: no address increment between transfers
+	0x1: increment address between transfers
+ -bit 10: Memory Increment Address
+	0x0: no address increment between transfers
+	0x1: increment address between transfers
+ -bit 15: Peripheral Increment Offset Size
+	0x0: offset size is linked to the peripheral bus width
+	0x1: offset size is fixed to 4 (32-bit alignment)
+ -bit 16-17: Priority level
+	0x0: low
+	0x1: medium
+	0x2: high
+	0x3: very high
+5. A 32bit mask specifying the DMA FIFO threshold configuration which are device
+   dependent:
+ -bit 0-1: Fifo threshold
+	0x0: 1/4 full FIFO
+	0x1: 1/2 full FIFO
+	0x2: 3/4 full FIFO
+	0x3: full FIFO
+
+Example:
+
+	usart1: serial at 40011000 {
+		compatible = "st,stm32-usart", "st,stm32-uart";
+		reg = <0x40011000 0x400>;
+		interrupts = <37>;
+		clocks = <&clk_pclk2>;
+		dmas = <&dma2 2 4 0x10400 0x3>,
+		       <&dma2 7 5 0x10200 0x3>;
+		dma-names = "rx", "tx";
+	};
-- 
1.9.1

[PATCH v4 2/4] dmaengine: Add STM32 DMA driver

[M'boumba Cedric Madianga]

This patch adds support for the STM32 DMA controller.

Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
---
 drivers/dma/Kconfig     |   12 +
 drivers/dma/Makefile    |    1 +
 drivers/dma/stm32-dma.c | 1141 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 1154 insertions(+)
 create mode 100644 drivers/dma/stm32-dma.c

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index af81a7a..b1a071b 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -431,6 +431,18 @@ config STE_DMA40
 	help
 	  Support for ST-Ericsson DMA40 controller
 
+config STM32_DMA
+	bool "STMicroelectronics STM32 DMA support"
+	depends on ARCH_STM32
+	select DMA_ENGINE
+	select DMA_OF
+	select DMA_VIRTUAL_CHANNELS
+	help
+	  Enable support for the on-chip DMA controller on STMicroelectronics
+	  STM32 MCUs.
+	  If you have a board based on such a MCU and wish to use DMA say Y or M
+	  here.
+
 config S3C24XX_DMAC
 	tristate "Samsung S3C24XX DMA support"
 	depends on ARCH_S3C24XX
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index ef9c099..2dd0a067 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -56,6 +56,7 @@ obj-$(CONFIG_QCOM_BAM_DMA) += qcom_bam_dma.o
 obj-$(CONFIG_RENESAS_DMA) += sh/
 obj-$(CONFIG_SIRF_DMA) += sirf-dma.o
 obj-$(CONFIG_STE_DMA40) += ste_dma40.o ste_dma40_ll.o
+obj-$(CONFIG_STM32_DMA) += stm32-dma.o
 obj-$(CONFIG_S3C24XX_DMAC) += s3c24xx-dma.o
 obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o
 obj-$(CONFIG_TEGRA20_APB_DMA) += tegra20-apb-dma.o
diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c
new file mode 100644
index 0000000..12f3a3e
--- /dev/null
+++ b/drivers/dma/stm32-dma.c
@@ -0,0 +1,1141 @@
+/*
+ * Driver for STM32 DMA controller
+ *
+ * Inspired by dma-jz4740.c and tegra20-apb-dma.c
+ *
+ * Copyright (C) M'boumba Cedric Madianga 2015
+ * Author: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
+ *
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_dma.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+
+#include "virt-dma.h"
+
+#define STM32_DMA_LISR			0x0000 /* DMA Low Int Status Reg */
+#define STM32_DMA_HISR			0x0004 /* DMA High Int Status Reg */
+#define STM32_DMA_LIFCR			0x0008 /* DMA Low Int Flag Clear Reg */
+#define STM32_DMA_HIFCR			0x000c /* DMA High Int Flag Clear Reg */
+#define STM32_DMA_TCI			BIT(5) /* Transfer Complete Interrupt */
+#define STM32_DMA_TEI			BIT(3) /* Transfer Error Interrupt */
+#define STM32_DMA_DMEI			BIT(2) /* Direct Mode Error Interrupt */
+#define STM32_DMA_FEI			BIT(0) /* FIFO Error Interrupt */
+
+/* DMA Stream x Configuration Register */
+#define STM32_DMA_SCR(x)		(0x0010 + 0x18 * (x)) /* x = 0..7 */
+#define STM32_DMA_SCR_REQ(n)		((n & 0x7) << 25)
+#define STM32_DMA_SCR_MBURST_MASK	GENMASK(24, 23)
+#define STM32_DMA_SCR_MBURST(n)	        ((n & 0x3) << 23)
+#define STM32_DMA_SCR_PBURST_MASK	GENMASK(22, 21)
+#define STM32_DMA_SCR_PBURST(n)	        ((n & 0x3) << 21)
+#define STM32_DMA_SCR_PL_MASK		GENMASK(17, 16)
+#define STM32_DMA_SCR_PL(n)		((n & 0x3) << 16)
+#define STM32_DMA_SCR_MSIZE_MASK	GENMASK(14, 13)
+#define STM32_DMA_SCR_MSIZE(n)		((n & 0x3) << 13)
+#define STM32_DMA_SCR_PSIZE_MASK	GENMASK(12, 11)
+#define STM32_DMA_SCR_PSIZE(n)		((n & 0x3) << 11)
+#define STM32_DMA_SCR_PSIZE_GET(n)	((n & STM32_DMA_SCR_PSIZE_MASK) >> 11)
+#define STM32_DMA_SCR_DIR_MASK		GENMASK(7, 6)
+#define STM32_DMA_SCR_DIR(n)		((n & 0x3) << 6)
+#define STM32_DMA_SCR_CT		BIT(19) /* Target in double buffer */
+#define STM32_DMA_SCR_DBM		BIT(18) /* Double Buffer Mode */
+#define STM32_DMA_SCR_PINCOS		BIT(15) /* Peripheral inc offset size */
+#define STM32_DMA_SCR_MINC		BIT(10) /* Memory increment mode */
+#define STM32_DMA_SCR_PINC		BIT(9) /* Peripheral increment mode */
+#define STM32_DMA_SCR_CIRC		BIT(8) /* Circular mode */
+#define STM32_DMA_SCR_PFCTRL		BIT(5) /* Peripheral Flow Controller */
+#define STM32_DMA_SCR_TCIE		BIT(4) /* Transfer Cplete Int Enable*/
+#define STM32_DMA_SCR_TEIE		BIT(2) /* Transfer Error Int Enable */
+#define STM32_DMA_SCR_DMEIE		BIT(1) /* Direct Mode Err Int Enable */
+#define STM32_DMA_SCR_EN		BIT(0) /* Stream Enable */
+#define STM32_DMA_SCR_CFG_MASK		(STM32_DMA_SCR_PINC \
+					| STM32_DMA_SCR_MINC \
+					| STM32_DMA_SCR_PINCOS \
+					| STM32_DMA_SCR_PL_MASK)
+#define STM32_DMA_SCR_IRQ_MASK		(STM32_DMA_SCR_TCIE \
+					| STM32_DMA_SCR_TEIE \
+					| STM32_DMA_SCR_DMEIE)
+
+/* DMA Stream x number of data register */
+#define STM32_DMA_SNDTR(x)		(0x0014 + 0x18 * (x))
+
+/* DMA stream peripheral address register */
+#define STM32_DMA_SPAR(x)		(0x0018 + 0x18 * (x))
+
+/* DMA stream x memory 0 address register */
+#define STM32_DMA_SM0AR(x)		(0x001c + 0x18 * (x))
+
+/* DMA stream x memory 1 address register */
+#define STM32_DMA_SM1AR(x)		(0x0020 + 0x18 * (x))
+
+/* DMA stream x FIFO control register */
+#define STM32_DMA_SFCR(x)		(0x0024 + 0x18 * (x))
+#define STM32_DMA_SFCR_FTH_MASK		GENMASK(1, 0)
+#define STM32_DMA_SFCR_FTH(n)		(n & STM32_DMA_SFCR_FTH_MASK)
+#define STM32_DMA_SFCR_FEIE		BIT(7) /* FIFO error interrupt enable */
+#define STM32_DMA_SFCR_DMDIS		BIT(2) /* Direct mode disable */
+#define STM32_DMA_SFCR_MASK		(STM32_DMA_SFCR_FEIE \
+					| STM32_DMA_SFCR_DMDIS)
+
+/* DMA direction */
+#define STM32_DMA_DEV_TO_MEM		0x00
+#define	STM32_DMA_MEM_TO_DEV		0x01
+#define	STM32_DMA_MEM_TO_MEM		0x02
+
+/* DMA priority level */
+#define STM32_DMA_PRIORITY_LOW		0x00
+#define STM32_DMA_PRIORITY_MEDIUM	0x01
+#define STM32_DMA_PRIORITY_HIGH		0x02
+#define STM32_DMA_PRIORITY_VERY_HIGH	0x03
+
+/* DMA FIFO threshold selection */
+#define STM32_DMA_FIFO_THRESHOLD_1QUARTERFULL		0x00
+#define STM32_DMA_FIFO_THRESHOLD_HALFFULL		0x01
+#define STM32_DMA_FIFO_THRESHOLD_3QUARTERSFULL		0x02
+#define STM32_DMA_FIFO_THRESHOLD_FULL			0x03
+
+#define STM32_DMA_MAX_DATA_ITEMS	0xffff
+#define STM32_DMA_MAX_CHANNELS		0x08
+#define STM32_DMA_MAX_REQUEST_ID	0x08
+#define STM32_DMA_MAX_DATA_PARAM	0x03
+
+enum stm32_dma_width {
+	STM32_DMA_BYTE,
+	STM32_DMA_HALF_WORD,
+	STM32_DMA_WORD,
+};
+
+enum stm32_dma_burst_size {
+	STM32_DMA_BURST_SINGLE,
+	STM32_DMA_BURST_INCR4,
+	STM32_DMA_BURST_INCR8,
+	STM32_DMA_BURST_INCR16,
+};
+
+struct stm32_dma_cfg {
+	u32 channel_id;
+	u32 request_line;
+	u32 stream_config;
+	u32 threshold;
+};
+
+struct stm32_dma_chan_reg {
+	u32 dma_lisr;
+	u32 dma_hisr;
+	u32 dma_lifcr;
+	u32 dma_hifcr;
+	u32 dma_scr;
+	u32 dma_sndtr;
+	u32 dma_spar;
+	u32 dma_sm0ar;
+	u32 dma_sm1ar;
+	u32 dma_sfcr;
+};
+
+struct stm32_dma_sg_req {
+	u32 len;
+	struct stm32_dma_chan_reg chan_reg;
+};
+
+struct stm32_dma_desc {
+	struct virt_dma_desc vdesc;
+	bool cyclic;
+	u32 num_sgs;
+	struct stm32_dma_sg_req sg_req[];
+};
+
+struct stm32_dma_chan {
+	struct virt_dma_chan vchan;
+	bool config_init;
+	bool busy;
+	u32 id;
+	u32 irq;
+	struct stm32_dma_desc *desc;
+	u32 next_sg;
+	struct dma_slave_config	dma_sconfig;
+	struct stm32_dma_chan_reg chan_reg;
+};
+
+struct stm32_dma_device {
+	struct dma_device ddev;
+	void __iomem *base;
+	struct clk *clk;
+	struct reset_control *rst;
+	bool mem2mem;
+	struct stm32_dma_chan chan[STM32_DMA_MAX_CHANNELS];
+};
+
+static struct stm32_dma_device *stm32_dma_get_dev(struct stm32_dma_chan *chan)
+{
+	return container_of(chan->vchan.chan.device, struct stm32_dma_device,
+			    ddev);
+}
+
+static struct stm32_dma_chan *to_stm32_dma_chan(struct dma_chan *c)
+{
+	return container_of(c, struct stm32_dma_chan, vchan.chan);
+}
+
+static struct stm32_dma_desc *to_stm32_dma_desc(struct virt_dma_desc *vdesc)
+{
+	return container_of(vdesc, struct stm32_dma_desc, vdesc);
+}
+
+static struct device *chan2dev(struct stm32_dma_chan *chan)
+{
+	return &chan->vchan.chan.dev->device;
+}
+
+static u32 stm32_dma_read(struct stm32_dma_device *dmadev, u32 reg)
+{
+	return readl_relaxed(dmadev->base + reg);
+}
+
+static void stm32_dma_write(struct stm32_dma_device *dmadev, u32 reg, u32 val)
+{
+	writel_relaxed(val, dmadev->base + reg);
+}
+
+static struct stm32_dma_desc *stm32_dma_alloc_desc(u32 num_sgs)
+{
+	return kzalloc(sizeof(struct stm32_dma_desc) +
+		       sizeof(struct stm32_dma_sg_req) * num_sgs, GFP_NOWAIT);
+}
+
+static int stm32_dma_get_width(struct stm32_dma_chan *chan,
+			       enum dma_slave_buswidth width)
+{
+	switch (width) {
+	case DMA_SLAVE_BUSWIDTH_1_BYTE:
+		return STM32_DMA_BYTE;
+	case DMA_SLAVE_BUSWIDTH_2_BYTES:
+		return STM32_DMA_HALF_WORD;
+	case DMA_SLAVE_BUSWIDTH_4_BYTES:
+		return STM32_DMA_WORD;
+	default:
+		dev_err(chan2dev(chan), "Dma bus width not supported\n");
+		return -EINVAL;
+	}
+}
+
+static int stm32_dma_get_burst(struct stm32_dma_chan *chan, u32 maxburst)
+{
+	switch (maxburst) {
+	case 0:
+	case 1:
+		return STM32_DMA_BURST_SINGLE;
+	case 4:
+		return STM32_DMA_BURST_INCR4;
+	case 8:
+		return STM32_DMA_BURST_INCR8;
+	case 16:
+		return STM32_DMA_BURST_INCR16;
+	default:
+		dev_err(chan2dev(chan), "Dma burst size not supported\n");
+		return -EINVAL;
+	}
+}
+
+static void stm32_dma_set_fifo_config(struct stm32_dma_chan *chan,
+				      u32 src_maxburst, u32 dst_maxburst)
+{
+	chan->chan_reg.dma_sfcr &= ~STM32_DMA_SFCR_MASK;
+	chan->chan_reg.dma_scr &= ~STM32_DMA_SCR_DMEIE;
+
+	if ((!src_maxburst) && (!dst_maxburst)) {
+		/* Using direct mode */
+		chan->chan_reg.dma_scr |= STM32_DMA_SCR_DMEIE;
+	} else {
+		/* Using FIFO mode */
+		chan->chan_reg.dma_sfcr |= STM32_DMA_SFCR_MASK;
+	}
+}
+
+static int stm32_dma_slave_config(struct dma_chan *c,
+				  struct dma_slave_config *config)
+{
+	struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
+
+	memcpy(&chan->dma_sconfig, config, sizeof(*config));
+
+	chan->config_init = true;
+
+	return 0;
+}
+
+static u32 stm32_dma_irq_status(struct stm32_dma_chan *chan)
+{
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	u32 flags, dma_isr;
+
+	/*
+	 * Read "flags" from DMA_xISR register corresponding to the selected
+	 * DMA channel at the correct bit offset inside that register.
+	 *
+	 * If (ch % 4) is 2 or 3, left shift the mask by 16 bits.
+	 * If (ch % 4) is 1 or 3, additionally left shift the mask by 6 bits.
+	 */
+
+	if (chan->id & 4)
+		dma_isr = stm32_dma_read(dmadev, STM32_DMA_HISR);
+	else
+		dma_isr = stm32_dma_read(dmadev, STM32_DMA_LISR);
+
+	flags = dma_isr >> (((chan->id & 2) << 3) | ((chan->id & 1) * 6));
+
+	return flags;
+}
+
+static void stm32_dma_irq_clear(struct stm32_dma_chan *chan, u32 flags)
+{
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	u32 dma_ifcr;
+
+	/*
+	 * Write "flags" to the DMA_xIFCR register corresponding to the selected
+	 * DMA channel at the correct bit offset inside that register.
+	 *
+	 * If (ch % 4) is 2 or 3, left shift the mask by 16 bits.
+	 * If (ch % 4) is 1 or 3, additionally left shift the mask by 6 bits.
+	 */
+	dma_ifcr = flags << (((chan->id & 2) << 3) | ((chan->id & 1) * 6));
+
+	if (chan->id & 4)
+		stm32_dma_write(dmadev, STM32_DMA_HIFCR, dma_ifcr);
+	else
+		stm32_dma_write(dmadev, STM32_DMA_LIFCR, dma_ifcr);
+}
+
+static int stm32_dma_disable_chan(struct stm32_dma_chan *chan)
+{
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	unsigned long timeout = jiffies + msecs_to_jiffies(5000);
+	u32 dma_scr, id;
+
+	id = chan->id;
+	dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(id));
+
+	if (dma_scr & STM32_DMA_SCR_EN) {
+		dma_scr &= ~STM32_DMA_SCR_EN;
+		stm32_dma_write(dmadev, STM32_DMA_SCR(id), dma_scr);
+
+		do {
+			dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(id));
+			dma_scr &= STM32_DMA_SCR_EN;
+			if (!dma_scr)
+				break;
+
+			if (time_after_eq(jiffies, timeout)) {
+				dev_err(chan2dev(chan), "%s: timeout!\n",
+					__func__);
+				return -EBUSY;
+			}
+			cond_resched();
+		} while (1);
+	}
+
+	return 0;
+}
+
+static void stm32_dma_stop(struct stm32_dma_chan *chan)
+{
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	u32 dma_scr, dma_sfcr, status;
+	int ret;
+
+	/* Disable interrupts */
+	dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(chan->id));
+	dma_scr &= ~STM32_DMA_SCR_IRQ_MASK;
+	stm32_dma_write(dmadev, STM32_DMA_SCR(chan->id), dma_scr);
+	dma_sfcr = stm32_dma_read(dmadev, STM32_DMA_SFCR(chan->id));
+	dma_sfcr &= ~STM32_DMA_SFCR_FEIE;
+	stm32_dma_write(dmadev, STM32_DMA_SFCR(chan->id), dma_sfcr);
+
+	/* Disable DMA */
+	ret = stm32_dma_disable_chan(chan);
+	if (ret < 0)
+		return;
+
+	/* Clear interrupt status if it is there */
+	status = stm32_dma_irq_status(chan);
+	if (status) {
+		dev_dbg(chan2dev(chan), "%s(): clearing interrupt: 0x%08x\n",
+			__func__, status);
+		stm32_dma_irq_clear(chan, status);
+	}
+
+	chan->busy = false;
+}
+
+static int stm32_dma_terminate_all(struct dma_chan *c)
+{
+	struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
+	unsigned long flags;
+	LIST_HEAD(head);
+
+	spin_lock_irqsave(&chan->vchan.lock, flags);
+
+	if (chan->busy) {
+		stm32_dma_stop(chan);
+		chan->desc = NULL;
+	}
+
+	vchan_get_all_descriptors(&chan->vchan, &head);
+	spin_unlock_irqrestore(&chan->vchan.lock, flags);
+	vchan_dma_desc_free_list(&chan->vchan, &head);
+
+	return 0;
+}
+
+static void stm32_dma_dump_reg(struct stm32_dma_chan *chan)
+{
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	u32 scr = stm32_dma_read(dmadev, STM32_DMA_SCR(chan->id));
+	u32 ndtr = stm32_dma_read(dmadev, STM32_DMA_SNDTR(chan->id));
+	u32 spar = stm32_dma_read(dmadev, STM32_DMA_SPAR(chan->id));
+	u32 sm0ar = stm32_dma_read(dmadev, STM32_DMA_SM0AR(chan->id));
+	u32 sm1ar = stm32_dma_read(dmadev, STM32_DMA_SM1AR(chan->id));
+	u32 sfcr = stm32_dma_read(dmadev, STM32_DMA_SFCR(chan->id));
+
+	dev_dbg(chan2dev(chan), "SCR:   0x%08x\n", scr);
+	dev_dbg(chan2dev(chan), "NDTR:  0x%08x\n", ndtr);
+	dev_dbg(chan2dev(chan), "SPAR:  0x%08x\n", spar);
+	dev_dbg(chan2dev(chan), "SM0AR: 0x%08x\n", sm0ar);
+	dev_dbg(chan2dev(chan), "SM1AR: 0x%08x\n", sm1ar);
+	dev_dbg(chan2dev(chan), "SFCR:  0x%08x\n", sfcr);
+}
+
+static int stm32_dma_start_transfer(struct stm32_dma_chan *chan)
+{
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	struct virt_dma_desc *vdesc;
+	struct stm32_dma_sg_req *sg_req;
+	struct stm32_dma_chan_reg *reg;
+	u32 status;
+	int ret;
+
+	ret = stm32_dma_disable_chan(chan);
+	if (ret < 0)
+		return ret;
+
+	if (!chan->desc) {
+		vdesc = vchan_next_desc(&chan->vchan);
+		if (!vdesc)
+			return 0;
+
+		chan->desc = to_stm32_dma_desc(vdesc);
+		chan->next_sg = 0;
+	}
+
+	if (chan->next_sg == chan->desc->num_sgs)
+		chan->next_sg = 0;
+
+	sg_req = &chan->desc->sg_req[chan->next_sg];
+	reg = &sg_req->chan_reg;
+
+	stm32_dma_write(dmadev, STM32_DMA_SCR(chan->id), reg->dma_scr);
+	stm32_dma_write(dmadev, STM32_DMA_SPAR(chan->id), reg->dma_spar);
+	stm32_dma_write(dmadev, STM32_DMA_SM0AR(chan->id), reg->dma_sm0ar);
+	stm32_dma_write(dmadev, STM32_DMA_SFCR(chan->id), reg->dma_sfcr);
+	stm32_dma_write(dmadev, STM32_DMA_SM1AR(chan->id), reg->dma_sm1ar);
+	stm32_dma_write(dmadev, STM32_DMA_SNDTR(chan->id), reg->dma_sndtr);
+
+	chan->next_sg++;
+
+	/* Clear interrupt status if it is there */
+	status = stm32_dma_irq_status(chan);
+	if (status)
+		stm32_dma_irq_clear(chan, status);
+
+	stm32_dma_dump_reg(chan);
+
+	/* Start DMA */
+	reg->dma_scr |= STM32_DMA_SCR_EN;
+	stm32_dma_write(dmadev, STM32_DMA_SCR(chan->id), reg->dma_scr);
+
+	chan->busy = true;
+
+	return 0;
+}
+
+static void stm32_dma_configure_next_sg(struct stm32_dma_chan *chan)
+{
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	struct stm32_dma_sg_req *sg_req;
+	u32 dma_scr, dma_sm0ar, dma_sm1ar, id;
+
+	id = chan->id;
+	dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(id));
+
+	if (dma_scr & STM32_DMA_SCR_DBM) {
+		if (chan->next_sg == chan->desc->num_sgs)
+			chan->next_sg = 0;
+
+		sg_req = &chan->desc->sg_req[chan->next_sg];
+
+		if (dma_scr & STM32_DMA_SCR_CT) {
+			dma_sm0ar = sg_req->chan_reg.dma_sm0ar;
+			stm32_dma_write(dmadev, STM32_DMA_SM0AR(id), dma_sm0ar);
+			dev_dbg(chan2dev(chan), "CT=1 <=> SM0AR: 0x%08x\n",
+				stm32_dma_read(dmadev, STM32_DMA_SM0AR(id)));
+		} else {
+			dma_sm1ar = sg_req->chan_reg.dma_sm1ar;
+			stm32_dma_write(dmadev, STM32_DMA_SM1AR(id), dma_sm1ar);
+			dev_dbg(chan2dev(chan), "CT=0 <=> SM1AR: 0x%08x\n",
+				stm32_dma_read(dmadev, STM32_DMA_SM1AR(id)));
+		}
+
+		chan->next_sg++;
+	}
+}
+
+static void stm32_dma_handle_chan_done(struct stm32_dma_chan *chan)
+{
+	if (chan->desc) {
+		if (chan->desc->cyclic) {
+			vchan_cyclic_callback(&chan->desc->vdesc);
+			stm32_dma_configure_next_sg(chan);
+		} else {
+			chan->busy = false;
+			if (chan->next_sg == chan->desc->num_sgs) {
+				list_del(&chan->desc->vdesc.node);
+				vchan_cookie_complete(&chan->desc->vdesc);
+				chan->desc = NULL;
+			}
+			stm32_dma_start_transfer(chan);
+		}
+	}
+}
+
+static irqreturn_t stm32_dma_chan_irq(int irq, void *devid)
+{
+	struct stm32_dma_chan *chan = devid;
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	u32 status, scr, sfcr;
+
+	spin_lock(&chan->vchan.lock);
+
+	status = stm32_dma_irq_status(chan);
+	scr = stm32_dma_read(dmadev, STM32_DMA_SCR(chan->id));
+	sfcr = stm32_dma_read(dmadev, STM32_DMA_SFCR(chan->id));
+
+	if ((status & STM32_DMA_TCI) && (scr & STM32_DMA_SCR_TCIE)) {
+		stm32_dma_irq_clear(chan, STM32_DMA_TCI);
+		stm32_dma_handle_chan_done(chan);
+
+	} else {
+		stm32_dma_irq_clear(chan, status);
+		dev_err(chan2dev(chan), "DMA error: status=0x%08x\n", status);
+	}
+
+	spin_unlock(&chan->vchan.lock);
+
+	return IRQ_HANDLED;
+}
+
+static void stm32_dma_issue_pending(struct dma_chan *c)
+{
+	struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&chan->vchan.lock, flags);
+	if (!chan->busy) {
+		if (vchan_issue_pending(&chan->vchan) && !chan->desc) {
+			ret = stm32_dma_start_transfer(chan);
+			if ((chan->desc->cyclic) && (!ret))
+				stm32_dma_configure_next_sg(chan);
+		}
+	}
+	spin_unlock_irqrestore(&chan->vchan.lock, flags);
+}
+
+static int stm32_dma_set_xfer_param(struct stm32_dma_chan *chan,
+				    enum dma_transfer_direction direction,
+				    enum dma_slave_buswidth *buswidth)
+{
+	enum dma_slave_buswidth src_addr_width, dst_addr_width;
+	int src_bus_width, dst_bus_width;
+	int src_burst_size, dst_burst_size;
+	u32 src_maxburst, dst_maxburst;
+	dma_addr_t src_addr, dst_addr;
+	u32 dma_scr = 0;
+
+	src_addr_width = chan->dma_sconfig.src_addr_width;
+	dst_addr_width = chan->dma_sconfig.dst_addr_width;
+	src_maxburst = chan->dma_sconfig.src_maxburst;
+	dst_maxburst = chan->dma_sconfig.dst_maxburst;
+	src_addr = chan->dma_sconfig.src_addr;
+	dst_addr = chan->dma_sconfig.dst_addr;
+
+	switch (direction) {
+	case DMA_MEM_TO_DEV:
+		dst_bus_width = stm32_dma_get_width(chan, dst_addr_width);
+		if (dst_bus_width < 0)
+			return dst_bus_width;
+
+		dst_burst_size = stm32_dma_get_burst(chan, dst_maxburst);
+		if (dst_burst_size < 0)
+			return dst_burst_size;
+
+		if (!src_addr_width)
+			src_addr_width = dst_addr_width;
+
+		src_bus_width = stm32_dma_get_width(chan, src_addr_width);
+		if (src_bus_width < 0)
+			return src_bus_width;
+
+		src_burst_size = stm32_dma_get_burst(chan, src_maxburst);
+		if (src_burst_size < 0)
+			return src_burst_size;
+
+		dma_scr = STM32_DMA_SCR_DIR(STM32_DMA_MEM_TO_DEV) |
+			STM32_DMA_SCR_PSIZE(dst_bus_width) |
+			STM32_DMA_SCR_MSIZE(src_bus_width) |
+			STM32_DMA_SCR_PBURST(dst_burst_size) |
+			STM32_DMA_SCR_MBURST(src_burst_size);
+
+		chan->chan_reg.dma_spar = chan->dma_sconfig.dst_addr;
+		*buswidth = dst_addr_width;
+		break;
+
+	case DMA_DEV_TO_MEM:
+		src_bus_width = stm32_dma_get_width(chan, src_addr_width);
+		if (src_bus_width < 0)
+			return src_bus_width;
+
+		src_burst_size = stm32_dma_get_burst(chan, src_maxburst);
+		if (src_burst_size < 0)
+			return src_burst_size;
+
+		if (!dst_addr_width)
+			dst_addr_width = src_addr_width;
+
+		dst_bus_width = stm32_dma_get_width(chan, dst_addr_width);
+		if (dst_bus_width < 0)
+			return dst_bus_width;
+
+		dst_burst_size = stm32_dma_get_burst(chan, dst_maxburst);
+		if (dst_burst_size < 0)
+			return dst_burst_size;
+
+		dma_scr = STM32_DMA_SCR_DIR(STM32_DMA_DEV_TO_MEM) |
+			STM32_DMA_SCR_PSIZE(src_bus_width) |
+			STM32_DMA_SCR_MSIZE(dst_bus_width) |
+			STM32_DMA_SCR_PBURST(src_burst_size) |
+			STM32_DMA_SCR_MBURST(dst_burst_size);
+
+		chan->chan_reg.dma_spar = chan->dma_sconfig.src_addr;
+		*buswidth = chan->dma_sconfig.src_addr_width;
+		break;
+
+	default:
+		dev_err(chan2dev(chan), "Dma direction is not supported\n");
+		return -EINVAL;
+	}
+
+	stm32_dma_set_fifo_config(chan, src_maxburst, dst_maxburst);
+
+	chan->chan_reg.dma_scr &= ~(STM32_DMA_SCR_DIR_MASK |
+			STM32_DMA_SCR_PSIZE_MASK | STM32_DMA_SCR_MSIZE_MASK |
+			STM32_DMA_SCR_PBURST_MASK | STM32_DMA_SCR_MBURST_MASK);
+	chan->chan_reg.dma_scr |= dma_scr;
+
+	return 0;
+}
+
+static void stm32_dma_clear_reg(struct stm32_dma_chan_reg *regs)
+{
+	memset(regs, 0, sizeof(struct stm32_dma_chan_reg));
+}
+
+static struct dma_async_tx_descriptor *stm32_dma_prep_slave_sg(
+	struct dma_chan *c, struct scatterlist *sgl,
+	u32 sg_len, enum dma_transfer_direction direction,
+	unsigned long flags, void *context)
+{
+	struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
+	struct stm32_dma_desc *desc;
+	struct scatterlist *sg;
+	enum dma_slave_buswidth buswidth;
+	u32 nb_data_items;
+	int i, ret;
+
+	if (!chan->config_init) {
+		dev_err(chan2dev(chan), "dma channel is not configured\n");
+		return NULL;
+	}
+
+	if (sg_len < 1) {
+		dev_err(chan2dev(chan), "Invalid segment length %d\n", sg_len);
+		return NULL;
+	}
+
+	desc = stm32_dma_alloc_desc(sg_len);
+	if (!desc)
+		return NULL;
+
+	ret = stm32_dma_set_xfer_param(chan, direction, &buswidth);
+	if (ret < 0)
+		goto err;
+
+	/* Set peripheral flow controller */
+	if (chan->dma_sconfig.device_fc)
+		chan->chan_reg.dma_scr |= STM32_DMA_SCR_PFCTRL;
+	else
+		chan->chan_reg.dma_scr &= ~STM32_DMA_SCR_PFCTRL;
+
+	for_each_sg(sgl, sg, sg_len, i) {
+		desc->sg_req[i].len = sg_dma_len(sg);
+
+		nb_data_items = desc->sg_req[i].len / buswidth;
+		if (nb_data_items > STM32_DMA_MAX_DATA_ITEMS) {
+			dev_err(chan2dev(chan), "nb items not supported\n");
+			goto err;
+		}
+
+		stm32_dma_clear_reg(&desc->sg_req[i].chan_reg);
+		desc->sg_req[i].chan_reg.dma_scr = chan->chan_reg.dma_scr;
+		desc->sg_req[i].chan_reg.dma_sfcr = chan->chan_reg.dma_sfcr;
+		desc->sg_req[i].chan_reg.dma_spar = chan->chan_reg.dma_spar;
+		desc->sg_req[i].chan_reg.dma_sm0ar = sg_dma_address(sg);
+		desc->sg_req[i].chan_reg.dma_sm1ar = sg_dma_address(sg);
+		desc->sg_req[i].chan_reg.dma_sndtr = nb_data_items;
+	}
+
+	desc->num_sgs = sg_len;
+	desc->cyclic = false;
+
+	return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
+
+err:
+	kfree(desc);
+	return NULL;
+}
+
+static struct dma_async_tx_descriptor *stm32_dma_prep_dma_cyclic(
+	struct dma_chan *c, dma_addr_t buf_addr, size_t buf_len,
+	size_t period_len, enum dma_transfer_direction direction,
+	unsigned long flags)
+{
+	struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
+	struct stm32_dma_desc *desc;
+	enum dma_slave_buswidth buswidth;
+	u32 num_periods, nb_data_items;
+	int i, ret;
+
+	if (!buf_len || !period_len) {
+		dev_err(chan2dev(chan), "Invalid buffer/period len\n");
+		return NULL;
+	}
+
+	if (!chan->config_init) {
+		dev_err(chan2dev(chan), "dma channel is not configured\n");
+		return NULL;
+	}
+
+	if (buf_len % period_len) {
+		dev_err(chan2dev(chan), "buf_len not multiple of period_len\n");
+		return NULL;
+	}
+
+	/*
+	 * We allow to take more number of requests till DMA is
+	 * not started. The driver will loop over all requests.
+	 * Once DMA is started then new requests can be queued only after
+	 * terminating the DMA.
+	 */
+	if (chan->busy) {
+		dev_err(chan2dev(chan), "Request not allowed when dma busy\n");
+		return NULL;
+	}
+
+	ret = stm32_dma_set_xfer_param(chan, direction, &buswidth);
+	if (ret < 0)
+		return NULL;
+
+	nb_data_items = period_len / buswidth;
+	if (nb_data_items > STM32_DMA_MAX_DATA_ITEMS) {
+		dev_err(chan2dev(chan), "number of items not supported\n");
+		return NULL;
+	}
+
+	/*  Enable Circular mode or double buffer mode */
+	if (buf_len == period_len)
+		chan->chan_reg.dma_scr |= STM32_DMA_SCR_CIRC;
+	else
+		chan->chan_reg.dma_scr |= STM32_DMA_SCR_DBM;
+
+	/* Clear periph ctrl if client set it */
+	chan->chan_reg.dma_scr &= ~STM32_DMA_SCR_PFCTRL;
+
+	num_periods = buf_len / period_len;
+
+	desc = stm32_dma_alloc_desc(num_periods);
+	if (!desc)
+		return NULL;
+
+	for (i = 0; i < num_periods; i++) {
+		desc->sg_req[i].len = period_len;
+
+		stm32_dma_clear_reg(&desc->sg_req[i].chan_reg);
+		desc->sg_req[i].chan_reg.dma_scr = chan->chan_reg.dma_scr;
+		desc->sg_req[i].chan_reg.dma_sfcr = chan->chan_reg.dma_sfcr;
+		desc->sg_req[i].chan_reg.dma_spar = chan->chan_reg.dma_spar;
+		desc->sg_req[i].chan_reg.dma_sm0ar = buf_addr;
+		desc->sg_req[i].chan_reg.dma_sm1ar = buf_addr;
+		desc->sg_req[i].chan_reg.dma_sndtr = nb_data_items;
+		buf_addr += period_len;
+	}
+
+	desc->num_sgs = num_periods;
+	desc->cyclic = true;
+
+	return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
+}
+
+static struct dma_async_tx_descriptor *stm32_dma_prep_dma_memcpy(
+	struct dma_chan *c, dma_addr_t dest,
+	dma_addr_t src, size_t len, unsigned long flags)
+{
+	struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
+	u32 num_sgs;
+	struct stm32_dma_desc *desc;
+	size_t xfer_count, offset;
+	int i;
+
+	num_sgs = DIV_ROUND_UP(len, STM32_DMA_MAX_DATA_ITEMS);
+	desc = stm32_dma_alloc_desc(num_sgs);
+	if (!desc)
+		return NULL;
+
+	for (offset = 0, i = 0; offset < len; offset += xfer_count, i++) {
+		xfer_count = min_t(size_t, len - offset,
+				   STM32_DMA_MAX_DATA_ITEMS);
+
+		desc->sg_req[i].len = xfer_count;
+
+		stm32_dma_clear_reg(&desc->sg_req[i].chan_reg);
+		desc->sg_req[i].chan_reg.dma_scr =
+			STM32_DMA_SCR_DIR(STM32_DMA_MEM_TO_MEM) |
+			STM32_DMA_SCR_MINC |
+			STM32_DMA_SCR_PINC |
+			STM32_DMA_SCR_TCIE |
+			STM32_DMA_SCR_TEIE;
+		desc->sg_req[i].chan_reg.dma_sfcr = STM32_DMA_SFCR_DMDIS |
+			STM32_DMA_SFCR_FTH(STM32_DMA_FIFO_THRESHOLD_FULL) |
+			STM32_DMA_SFCR_FEIE;
+		desc->sg_req[i].chan_reg.dma_spar = src + offset;
+		desc->sg_req[i].chan_reg.dma_sm0ar = dest + offset;
+		desc->sg_req[i].chan_reg.dma_sndtr = xfer_count;
+	}
+
+	desc->num_sgs = num_sgs;
+	desc->cyclic = false;
+
+	return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
+}
+
+static size_t stm32_dma_desc_residue(struct stm32_dma_chan *chan,
+				     struct stm32_dma_desc *desc,
+				     u32 next_sg)
+{
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	u32 dma_scr, width, residue, count;
+	int i;
+
+	residue = 0;
+
+	for (i = next_sg; i < desc->num_sgs; i++)
+		residue += desc->sg_req[i].len;
+
+	if (next_sg != 0) {
+		dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(chan->id));
+		width = STM32_DMA_SCR_PSIZE_GET(dma_scr);
+		count = stm32_dma_read(dmadev, STM32_DMA_SNDTR(chan->id));
+
+		residue += count << width;
+	}
+
+	return residue;
+}
+
+static enum dma_status stm32_dma_tx_status(struct dma_chan *c,
+					   dma_cookie_t cookie,
+					   struct dma_tx_state *state)
+{
+	struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
+	struct virt_dma_desc *vdesc;
+	enum dma_status status;
+	unsigned long flags;
+	u32 residue;
+
+	status = dma_cookie_status(c, cookie, state);
+	if ((status == DMA_COMPLETE) || (!state))
+		return status;
+
+	spin_lock_irqsave(&chan->vchan.lock, flags);
+	vdesc = vchan_find_desc(&chan->vchan, cookie);
+	if (cookie == chan->desc->vdesc.tx.cookie) {
+		residue = stm32_dma_desc_residue(chan, chan->desc,
+						 chan->next_sg);
+	} else if (vdesc) {
+		residue = stm32_dma_desc_residue(chan,
+						 to_stm32_dma_desc(vdesc), 0);
+	} else {
+		residue = 0;
+	}
+
+	dma_set_residue(state, residue);
+
+	spin_unlock_irqrestore(&chan->vchan.lock, flags);
+
+	return status;
+}
+
+static int stm32_dma_alloc_chan_resources(struct dma_chan *c)
+{
+	struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	int ret;
+
+	chan->config_init = false;
+	ret = clk_prepare_enable(dmadev->clk);
+	if (ret < 0) {
+		dev_err(chan2dev(chan), "clk_prepare_enable failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = stm32_dma_disable_chan(chan);
+	if (ret < 0)
+		clk_disable_unprepare(dmadev->clk);
+
+	return ret;
+}
+
+static void stm32_dma_free_chan_resources(struct dma_chan *c)
+{
+	struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	unsigned long flags;
+
+	dev_dbg(chan2dev(chan), "Freeing channel %d\n", chan->id);
+
+	if (chan->busy) {
+		spin_lock_irqsave(&chan->vchan.lock, flags);
+		stm32_dma_stop(chan);
+		chan->desc = NULL;
+		spin_unlock_irqrestore(&chan->vchan.lock, flags);
+	}
+
+	clk_disable_unprepare(dmadev->clk);
+
+	vchan_free_chan_resources(to_virt_chan(c));
+}
+
+static void stm32_dma_desc_free(struct virt_dma_desc *vdesc)
+{
+	kfree(container_of(vdesc, struct stm32_dma_desc, vdesc));
+}
+
+void stm32_dma_set_config(struct stm32_dma_chan *chan,
+			  struct stm32_dma_cfg *cfg)
+{
+	stm32_dma_clear_reg(&chan->chan_reg);
+
+	chan->chan_reg.dma_scr = cfg->stream_config & STM32_DMA_SCR_CFG_MASK;
+	chan->chan_reg.dma_scr |= STM32_DMA_SCR_REQ(cfg->request_line);
+
+	/* Enable Interrupts  */
+	chan->chan_reg.dma_scr |= STM32_DMA_SCR_TEIE | STM32_DMA_SCR_TCIE;
+
+	chan->chan_reg.dma_sfcr = cfg->threshold & STM32_DMA_SFCR_FTH_MASK;
+}
+
+static struct dma_chan *stm32_dma_of_xlate(struct of_phandle_args *dma_spec,
+					   struct of_dma *ofdma)
+{
+	struct stm32_dma_device *dmadev = ofdma->of_dma_data;
+	struct stm32_dma_cfg cfg;
+	struct stm32_dma_chan *chan;
+	struct dma_chan *c;
+
+	if (dma_spec->args_count < 3)
+		return NULL;
+
+	cfg.channel_id = dma_spec->args[0];
+	cfg.request_line = dma_spec->args[1];
+	cfg.stream_config = dma_spec->args[2];
+	cfg.threshold = 0;
+
+	if ((cfg.channel_id >= STM32_DMA_MAX_CHANNELS) || (cfg.request_line >=
+				STM32_DMA_MAX_REQUEST_ID))
+		return NULL;
+
+	if (dma_spec->args_count > 3)
+		cfg.threshold = dma_spec->args[3];
+
+	chan = &dmadev->chan[cfg.channel_id];
+
+	c = dma_get_slave_channel(&chan->vchan.chan);
+	if (c)
+		stm32_dma_set_config(chan, &cfg);
+
+	return c;
+}
+
+static const struct of_device_id stm32_dma_of_match[] = {
+	{ .compatible = "st,stm32-dma", },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, stm32_dma_of_match);
+
+static int stm32_dma_probe(struct platform_device *pdev)
+{
+	struct stm32_dma_chan *chan;
+	struct stm32_dma_device *dmadev;
+	struct dma_device *dd;
+	const struct of_device_id *match;
+	struct resource *res;
+	int i, ret;
+
+	match = of_match_device(stm32_dma_of_match, &pdev->dev);
+	if (!match) {
+		dev_err(&pdev->dev, "Error: No device match found\n");
+		return -ENODEV;
+	}
+
+	dmadev = devm_kzalloc(&pdev->dev, sizeof(*dmadev), GFP_KERNEL);
+	if (!dmadev)
+		return -ENOMEM;
+
+	dd = &dmadev->ddev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	dmadev->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(dmadev->base))
+		return PTR_ERR(dmadev->base);
+
+	dmadev->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(dmadev->clk)) {
+		dev_err(&pdev->dev, "Error: Missing controller clock\n");
+		return PTR_ERR(dmadev->clk);
+	}
+
+	dmadev->mem2mem = of_property_read_bool(pdev->dev.of_node,
+						"st,mem2mem");
+
+	dmadev->rst = devm_reset_control_get(&pdev->dev, NULL);
+	if (!IS_ERR(dmadev->rst)) {
+		reset_control_assert(dmadev->rst);
+		udelay(2);
+		reset_control_deassert(dmadev->rst);
+	}
+
+	dma_cap_set(DMA_SLAVE, dd->cap_mask);
+	dma_cap_set(DMA_PRIVATE, dd->cap_mask);
+	dma_cap_set(DMA_CYCLIC, dd->cap_mask);
+	dd->device_alloc_chan_resources = stm32_dma_alloc_chan_resources;
+	dd->device_free_chan_resources = stm32_dma_free_chan_resources;
+	dd->device_tx_status = stm32_dma_tx_status;
+	dd->device_issue_pending = stm32_dma_issue_pending;
+	dd->device_prep_slave_sg = stm32_dma_prep_slave_sg;
+	dd->device_prep_dma_cyclic = stm32_dma_prep_dma_cyclic;
+	dd->device_config = stm32_dma_slave_config;
+	dd->device_terminate_all = stm32_dma_terminate_all;
+	dd->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
+		BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
+		BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+	dd->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
+		BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
+		BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+	dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
+	dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
+	dd->dev = &pdev->dev;
+	INIT_LIST_HEAD(&dd->channels);
+
+	if (dmadev->mem2mem) {
+		dma_cap_set(DMA_MEMCPY, dd->cap_mask);
+		dd->device_prep_dma_memcpy = stm32_dma_prep_dma_memcpy;
+		dd->directions |= BIT(DMA_MEM_TO_MEM);
+	}
+
+	for (i = 0; i < STM32_DMA_MAX_CHANNELS; i++) {
+		chan = &dmadev->chan[i];
+		chan->id = i;
+		chan->vchan.desc_free = stm32_dma_desc_free;
+		vchan_init(&chan->vchan, dd);
+	}
+
+	ret = dma_async_device_register(dd);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < STM32_DMA_MAX_CHANNELS; i++) {
+		chan = &dmadev->chan[i];
+		res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
+		if (!res) {
+			ret = -EINVAL;
+			dev_err(&pdev->dev, "No irq resource for chan %d\n", i);
+			goto err_unregister;
+		}
+		chan->irq = res->start;
+		ret = devm_request_irq(&pdev->dev, chan->irq,
+				       stm32_dma_chan_irq, 0,
+				       dev_name(chan2dev(chan)), chan);
+		if (ret) {
+			dev_err(&pdev->dev,
+				"request_irq failed with err %d channel %d\n",
+				ret, i);
+			goto err_unregister;
+		}
+	}
+
+	ret = of_dma_controller_register(pdev->dev.of_node,
+					 stm32_dma_of_xlate, dmadev);
+	if (ret < 0) {
+		dev_err(&pdev->dev,
+			"STM32 DMA DMA OF registration failed %d\n", ret);
+		goto err_unregister;
+	}
+
+	platform_set_drvdata(pdev, dmadev);
+
+	dev_info(&pdev->dev, "STM32 DMA driver registered\n");
+
+	return 0;
+
+err_unregister:
+	dma_async_device_unregister(dd);
+
+	return ret;
+}
+
+static struct platform_driver stm32_dma_driver = {
+	.driver = {
+		.name = "stm32-dma",
+		.of_match_table = stm32_dma_of_match,
+	},
+};
+
+static int __init stm32_dma_init(void)
+{
+	return platform_driver_probe(&stm32_dma_driver, stm32_dma_probe);
+}
+subsys_initcall(stm32_dma_init);
-- 
1.9.1

[PATCH v4 2/4] dmaengine: Add STM32 DMA driver

[M'boumba Cedric Madianga]

This patch adds support for the STM32 DMA controller.

Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
---
 drivers/dma/Kconfig     |   12 +
 drivers/dma/Makefile    |    1 +
 drivers/dma/stm32-dma.c | 1141 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 1154 insertions(+)
 create mode 100644 drivers/dma/stm32-dma.c

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index af81a7a..b1a071b 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -431,6 +431,18 @@ config STE_DMA40
 	help
 	  Support for ST-Ericsson DMA40 controller
 
+config STM32_DMA
+	bool "STMicroelectronics STM32 DMA support"
+	depends on ARCH_STM32
+	select DMA_ENGINE
+	select DMA_OF
+	select DMA_VIRTUAL_CHANNELS
+	help
+	  Enable support for the on-chip DMA controller on STMicroelectronics
+	  STM32 MCUs.
+	  If you have a board based on such a MCU and wish to use DMA say Y or M
+	  here.
+
 config S3C24XX_DMAC
 	tristate "Samsung S3C24XX DMA support"
 	depends on ARCH_S3C24XX
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index ef9c099..2dd0a067 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -56,6 +56,7 @@ obj-$(CONFIG_QCOM_BAM_DMA) += qcom_bam_dma.o
 obj-$(CONFIG_RENESAS_DMA) += sh/
 obj-$(CONFIG_SIRF_DMA) += sirf-dma.o
 obj-$(CONFIG_STE_DMA40) += ste_dma40.o ste_dma40_ll.o
+obj-$(CONFIG_STM32_DMA) += stm32-dma.o
 obj-$(CONFIG_S3C24XX_DMAC) += s3c24xx-dma.o
 obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o
 obj-$(CONFIG_TEGRA20_APB_DMA) += tegra20-apb-dma.o
diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c
new file mode 100644
index 0000000..12f3a3e
--- /dev/null
+++ b/drivers/dma/stm32-dma.c
@@ -0,0 +1,1141 @@
+/*
+ * Driver for STM32 DMA controller
+ *
+ * Inspired by dma-jz4740.c and tegra20-apb-dma.c
+ *
+ * Copyright (C) M'boumba Cedric Madianga 2015
+ * Author: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
+ *
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_dma.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+
+#include "virt-dma.h"
+
+#define STM32_DMA_LISR			0x0000 /* DMA Low Int Status Reg */
+#define STM32_DMA_HISR			0x0004 /* DMA High Int Status Reg */
+#define STM32_DMA_LIFCR			0x0008 /* DMA Low Int Flag Clear Reg */
+#define STM32_DMA_HIFCR			0x000c /* DMA High Int Flag Clear Reg */
+#define STM32_DMA_TCI			BIT(5) /* Transfer Complete Interrupt */
+#define STM32_DMA_TEI			BIT(3) /* Transfer Error Interrupt */
+#define STM32_DMA_DMEI			BIT(2) /* Direct Mode Error Interrupt */
+#define STM32_DMA_FEI			BIT(0) /* FIFO Error Interrupt */
+
+/* DMA Stream x Configuration Register */
+#define STM32_DMA_SCR(x)		(0x0010 + 0x18 * (x)) /* x = 0..7 */
+#define STM32_DMA_SCR_REQ(n)		((n & 0x7) << 25)
+#define STM32_DMA_SCR_MBURST_MASK	GENMASK(24, 23)
+#define STM32_DMA_SCR_MBURST(n)	        ((n & 0x3) << 23)
+#define STM32_DMA_SCR_PBURST_MASK	GENMASK(22, 21)
+#define STM32_DMA_SCR_PBURST(n)	        ((n & 0x3) << 21)
+#define STM32_DMA_SCR_PL_MASK		GENMASK(17, 16)
+#define STM32_DMA_SCR_PL(n)		((n & 0x3) << 16)
+#define STM32_DMA_SCR_MSIZE_MASK	GENMASK(14, 13)
+#define STM32_DMA_SCR_MSIZE(n)		((n & 0x3) << 13)
+#define STM32_DMA_SCR_PSIZE_MASK	GENMASK(12, 11)
+#define STM32_DMA_SCR_PSIZE(n)		((n & 0x3) << 11)
+#define STM32_DMA_SCR_PSIZE_GET(n)	((n & STM32_DMA_SCR_PSIZE_MASK) >> 11)
+#define STM32_DMA_SCR_DIR_MASK		GENMASK(7, 6)
+#define STM32_DMA_SCR_DIR(n)		((n & 0x3) << 6)
+#define STM32_DMA_SCR_CT		BIT(19) /* Target in double buffer */
+#define STM32_DMA_SCR_DBM		BIT(18) /* Double Buffer Mode */
+#define STM32_DMA_SCR_PINCOS		BIT(15) /* Peripheral inc offset size */
+#define STM32_DMA_SCR_MINC		BIT(10) /* Memory increment mode */
+#define STM32_DMA_SCR_PINC		BIT(9) /* Peripheral increment mode */
+#define STM32_DMA_SCR_CIRC		BIT(8) /* Circular mode */
+#define STM32_DMA_SCR_PFCTRL		BIT(5) /* Peripheral Flow Controller */
+#define STM32_DMA_SCR_TCIE		BIT(4) /* Transfer Cplete Int Enable*/
+#define STM32_DMA_SCR_TEIE		BIT(2) /* Transfer Error Int Enable */
+#define STM32_DMA_SCR_DMEIE		BIT(1) /* Direct Mode Err Int Enable */
+#define STM32_DMA_SCR_EN		BIT(0) /* Stream Enable */
+#define STM32_DMA_SCR_CFG_MASK		(STM32_DMA_SCR_PINC \
+					| STM32_DMA_SCR_MINC \
+					| STM32_DMA_SCR_PINCOS \
+					| STM32_DMA_SCR_PL_MASK)
+#define STM32_DMA_SCR_IRQ_MASK		(STM32_DMA_SCR_TCIE \
+					| STM32_DMA_SCR_TEIE \
+					| STM32_DMA_SCR_DMEIE)
+
+/* DMA Stream x number of data register */
+#define STM32_DMA_SNDTR(x)		(0x0014 + 0x18 * (x))
+
+/* DMA stream peripheral address register */
+#define STM32_DMA_SPAR(x)		(0x0018 + 0x18 * (x))
+
+/* DMA stream x memory 0 address register */
+#define STM32_DMA_SM0AR(x)		(0x001c + 0x18 * (x))
+
+/* DMA stream x memory 1 address register */
+#define STM32_DMA_SM1AR(x)		(0x0020 + 0x18 * (x))
+
+/* DMA stream x FIFO control register */
+#define STM32_DMA_SFCR(x)		(0x0024 + 0x18 * (x))
+#define STM32_DMA_SFCR_FTH_MASK		GENMASK(1, 0)
+#define STM32_DMA_SFCR_FTH(n)		(n & STM32_DMA_SFCR_FTH_MASK)
+#define STM32_DMA_SFCR_FEIE		BIT(7) /* FIFO error interrupt enable */
+#define STM32_DMA_SFCR_DMDIS		BIT(2) /* Direct mode disable */
+#define STM32_DMA_SFCR_MASK		(STM32_DMA_SFCR_FEIE \
+					| STM32_DMA_SFCR_DMDIS)
+
+/* DMA direction */
+#define STM32_DMA_DEV_TO_MEM		0x00
+#define	STM32_DMA_MEM_TO_DEV		0x01
+#define	STM32_DMA_MEM_TO_MEM		0x02
+
+/* DMA priority level */
+#define STM32_DMA_PRIORITY_LOW		0x00
+#define STM32_DMA_PRIORITY_MEDIUM	0x01
+#define STM32_DMA_PRIORITY_HIGH		0x02
+#define STM32_DMA_PRIORITY_VERY_HIGH	0x03
+
+/* DMA FIFO threshold selection */
+#define STM32_DMA_FIFO_THRESHOLD_1QUARTERFULL		0x00
+#define STM32_DMA_FIFO_THRESHOLD_HALFFULL		0x01
+#define STM32_DMA_FIFO_THRESHOLD_3QUARTERSFULL		0x02
+#define STM32_DMA_FIFO_THRESHOLD_FULL			0x03
+
+#define STM32_DMA_MAX_DATA_ITEMS	0xffff
+#define STM32_DMA_MAX_CHANNELS		0x08
+#define STM32_DMA_MAX_REQUEST_ID	0x08
+#define STM32_DMA_MAX_DATA_PARAM	0x03
+
+enum stm32_dma_width {
+	STM32_DMA_BYTE,
+	STM32_DMA_HALF_WORD,
+	STM32_DMA_WORD,
+};
+
+enum stm32_dma_burst_size {
+	STM32_DMA_BURST_SINGLE,
+	STM32_DMA_BURST_INCR4,
+	STM32_DMA_BURST_INCR8,
+	STM32_DMA_BURST_INCR16,
+};
+
+struct stm32_dma_cfg {
+	u32 channel_id;
+	u32 request_line;
+	u32 stream_config;
+	u32 threshold;
+};
+
+struct stm32_dma_chan_reg {
+	u32 dma_lisr;
+	u32 dma_hisr;
+	u32 dma_lifcr;
+	u32 dma_hifcr;
+	u32 dma_scr;
+	u32 dma_sndtr;
+	u32 dma_spar;
+	u32 dma_sm0ar;
+	u32 dma_sm1ar;
+	u32 dma_sfcr;
+};
+
+struct stm32_dma_sg_req {
+	u32 len;
+	struct stm32_dma_chan_reg chan_reg;
+};
+
+struct stm32_dma_desc {
+	struct virt_dma_desc vdesc;
+	bool cyclic;
+	u32 num_sgs;
+	struct stm32_dma_sg_req sg_req[];
+};
+
+struct stm32_dma_chan {
+	struct virt_dma_chan vchan;
+	bool config_init;
+	bool busy;
+	u32 id;
+	u32 irq;
+	struct stm32_dma_desc *desc;
+	u32 next_sg;
+	struct dma_slave_config	dma_sconfig;
+	struct stm32_dma_chan_reg chan_reg;
+};
+
+struct stm32_dma_device {
+	struct dma_device ddev;
+	void __iomem *base;
+	struct clk *clk;
+	struct reset_control *rst;
+	bool mem2mem;
+	struct stm32_dma_chan chan[STM32_DMA_MAX_CHANNELS];
+};
+
+static struct stm32_dma_device *stm32_dma_get_dev(struct stm32_dma_chan *chan)
+{
+	return container_of(chan->vchan.chan.device, struct stm32_dma_device,
+			    ddev);
+}
+
+static struct stm32_dma_chan *to_stm32_dma_chan(struct dma_chan *c)
+{
+	return container_of(c, struct stm32_dma_chan, vchan.chan);
+}
+
+static struct stm32_dma_desc *to_stm32_dma_desc(struct virt_dma_desc *vdesc)
+{
+	return container_of(vdesc, struct stm32_dma_desc, vdesc);
+}
+
+static struct device *chan2dev(struct stm32_dma_chan *chan)
+{
+	return &chan->vchan.chan.dev->device;
+}
+
+static u32 stm32_dma_read(struct stm32_dma_device *dmadev, u32 reg)
+{
+	return readl_relaxed(dmadev->base + reg);
+}
+
+static void stm32_dma_write(struct stm32_dma_device *dmadev, u32 reg, u32 val)
+{
+	writel_relaxed(val, dmadev->base + reg);
+}
+
+static struct stm32_dma_desc *stm32_dma_alloc_desc(u32 num_sgs)
+{
+	return kzalloc(sizeof(struct stm32_dma_desc) +
+		       sizeof(struct stm32_dma_sg_req) * num_sgs, GFP_NOWAIT);
+}
+
+static int stm32_dma_get_width(struct stm32_dma_chan *chan,
+			       enum dma_slave_buswidth width)
+{
+	switch (width) {
+	case DMA_SLAVE_BUSWIDTH_1_BYTE:
+		return STM32_DMA_BYTE;
+	case DMA_SLAVE_BUSWIDTH_2_BYTES:
+		return STM32_DMA_HALF_WORD;
+	case DMA_SLAVE_BUSWIDTH_4_BYTES:
+		return STM32_DMA_WORD;
+	default:
+		dev_err(chan2dev(chan), "Dma bus width not supported\n");
+		return -EINVAL;
+	}
+}
+
+static int stm32_dma_get_burst(struct stm32_dma_chan *chan, u32 maxburst)
+{
+	switch (maxburst) {
+	case 0:
+	case 1:
+		return STM32_DMA_BURST_SINGLE;
+	case 4:
+		return STM32_DMA_BURST_INCR4;
+	case 8:
+		return STM32_DMA_BURST_INCR8;
+	case 16:
+		return STM32_DMA_BURST_INCR16;
+	default:
+		dev_err(chan2dev(chan), "Dma burst size not supported\n");
+		return -EINVAL;
+	}
+}
+
+static void stm32_dma_set_fifo_config(struct stm32_dma_chan *chan,
+				      u32 src_maxburst, u32 dst_maxburst)
+{
+	chan->chan_reg.dma_sfcr &= ~STM32_DMA_SFCR_MASK;
+	chan->chan_reg.dma_scr &= ~STM32_DMA_SCR_DMEIE;
+
+	if ((!src_maxburst) && (!dst_maxburst)) {
+		/* Using direct mode */
+		chan->chan_reg.dma_scr |= STM32_DMA_SCR_DMEIE;
+	} else {
+		/* Using FIFO mode */
+		chan->chan_reg.dma_sfcr |= STM32_DMA_SFCR_MASK;
+	}
+}
+
+static int stm32_dma_slave_config(struct dma_chan *c,
+				  struct dma_slave_config *config)
+{
+	struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
+
+	memcpy(&chan->dma_sconfig, config, sizeof(*config));
+
+	chan->config_init = true;
+
+	return 0;
+}
+
+static u32 stm32_dma_irq_status(struct stm32_dma_chan *chan)
+{
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	u32 flags, dma_isr;
+
+	/*
+	 * Read "flags" from DMA_xISR register corresponding to the selected
+	 * DMA channel at the correct bit offset inside that register.
+	 *
+	 * If (ch % 4) is 2 or 3, left shift the mask by 16 bits.
+	 * If (ch % 4) is 1 or 3, additionally left shift the mask by 6 bits.
+	 */
+
+	if (chan->id & 4)
+		dma_isr = stm32_dma_read(dmadev, STM32_DMA_HISR);
+	else
+		dma_isr = stm32_dma_read(dmadev, STM32_DMA_LISR);
+
+	flags = dma_isr >> (((chan->id & 2) << 3) | ((chan->id & 1) * 6));
+
+	return flags;
+}
+
+static void stm32_dma_irq_clear(struct stm32_dma_chan *chan, u32 flags)
+{
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	u32 dma_ifcr;
+
+	/*
+	 * Write "flags" to the DMA_xIFCR register corresponding to the selected
+	 * DMA channel at the correct bit offset inside that register.
+	 *
+	 * If (ch % 4) is 2 or 3, left shift the mask by 16 bits.
+	 * If (ch % 4) is 1 or 3, additionally left shift the mask by 6 bits.
+	 */
+	dma_ifcr = flags << (((chan->id & 2) << 3) | ((chan->id & 1) * 6));
+
+	if (chan->id & 4)
+		stm32_dma_write(dmadev, STM32_DMA_HIFCR, dma_ifcr);
+	else
+		stm32_dma_write(dmadev, STM32_DMA_LIFCR, dma_ifcr);
+}
+
+static int stm32_dma_disable_chan(struct stm32_dma_chan *chan)
+{
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	unsigned long timeout = jiffies + msecs_to_jiffies(5000);
+	u32 dma_scr, id;
+
+	id = chan->id;
+	dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(id));
+
+	if (dma_scr & STM32_DMA_SCR_EN) {
+		dma_scr &= ~STM32_DMA_SCR_EN;
+		stm32_dma_write(dmadev, STM32_DMA_SCR(id), dma_scr);
+
+		do {
+			dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(id));
+			dma_scr &= STM32_DMA_SCR_EN;
+			if (!dma_scr)
+				break;
+
+			if (time_after_eq(jiffies, timeout)) {
+				dev_err(chan2dev(chan), "%s: timeout!\n",
+					__func__);
+				return -EBUSY;
+			}
+			cond_resched();
+		} while (1);
+	}
+
+	return 0;
+}
+
+static void stm32_dma_stop(struct stm32_dma_chan *chan)
+{
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	u32 dma_scr, dma_sfcr, status;
+	int ret;
+
+	/* Disable interrupts */
+	dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(chan->id));
+	dma_scr &= ~STM32_DMA_SCR_IRQ_MASK;
+	stm32_dma_write(dmadev, STM32_DMA_SCR(chan->id), dma_scr);
+	dma_sfcr = stm32_dma_read(dmadev, STM32_DMA_SFCR(chan->id));
+	dma_sfcr &= ~STM32_DMA_SFCR_FEIE;
+	stm32_dma_write(dmadev, STM32_DMA_SFCR(chan->id), dma_sfcr);
+
+	/* Disable DMA */
+	ret = stm32_dma_disable_chan(chan);
+	if (ret < 0)
+		return;
+
+	/* Clear interrupt status if it is there */
+	status = stm32_dma_irq_status(chan);
+	if (status) {
+		dev_dbg(chan2dev(chan), "%s(): clearing interrupt: 0x%08x\n",
+			__func__, status);
+		stm32_dma_irq_clear(chan, status);
+	}
+
+	chan->busy = false;
+}
+
+static int stm32_dma_terminate_all(struct dma_chan *c)
+{
+	struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
+	unsigned long flags;
+	LIST_HEAD(head);
+
+	spin_lock_irqsave(&chan->vchan.lock, flags);
+
+	if (chan->busy) {
+		stm32_dma_stop(chan);
+		chan->desc = NULL;
+	}
+
+	vchan_get_all_descriptors(&chan->vchan, &head);
+	spin_unlock_irqrestore(&chan->vchan.lock, flags);
+	vchan_dma_desc_free_list(&chan->vchan, &head);
+
+	return 0;
+}
+
+static void stm32_dma_dump_reg(struct stm32_dma_chan *chan)
+{
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	u32 scr = stm32_dma_read(dmadev, STM32_DMA_SCR(chan->id));
+	u32 ndtr = stm32_dma_read(dmadev, STM32_DMA_SNDTR(chan->id));
+	u32 spar = stm32_dma_read(dmadev, STM32_DMA_SPAR(chan->id));
+	u32 sm0ar = stm32_dma_read(dmadev, STM32_DMA_SM0AR(chan->id));
+	u32 sm1ar = stm32_dma_read(dmadev, STM32_DMA_SM1AR(chan->id));
+	u32 sfcr = stm32_dma_read(dmadev, STM32_DMA_SFCR(chan->id));
+
+	dev_dbg(chan2dev(chan), "SCR:   0x%08x\n", scr);
+	dev_dbg(chan2dev(chan), "NDTR:  0x%08x\n", ndtr);
+	dev_dbg(chan2dev(chan), "SPAR:  0x%08x\n", spar);
+	dev_dbg(chan2dev(chan), "SM0AR: 0x%08x\n", sm0ar);
+	dev_dbg(chan2dev(chan), "SM1AR: 0x%08x\n", sm1ar);
+	dev_dbg(chan2dev(chan), "SFCR:  0x%08x\n", sfcr);
+}
+
+static int stm32_dma_start_transfer(struct stm32_dma_chan *chan)
+{
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	struct virt_dma_desc *vdesc;
+	struct stm32_dma_sg_req *sg_req;
+	struct stm32_dma_chan_reg *reg;
+	u32 status;
+	int ret;
+
+	ret = stm32_dma_disable_chan(chan);
+	if (ret < 0)
+		return ret;
+
+	if (!chan->desc) {
+		vdesc = vchan_next_desc(&chan->vchan);
+		if (!vdesc)
+			return 0;
+
+		chan->desc = to_stm32_dma_desc(vdesc);
+		chan->next_sg = 0;
+	}
+
+	if (chan->next_sg == chan->desc->num_sgs)
+		chan->next_sg = 0;
+
+	sg_req = &chan->desc->sg_req[chan->next_sg];
+	reg = &sg_req->chan_reg;
+
+	stm32_dma_write(dmadev, STM32_DMA_SCR(chan->id), reg->dma_scr);
+	stm32_dma_write(dmadev, STM32_DMA_SPAR(chan->id), reg->dma_spar);
+	stm32_dma_write(dmadev, STM32_DMA_SM0AR(chan->id), reg->dma_sm0ar);
+	stm32_dma_write(dmadev, STM32_DMA_SFCR(chan->id), reg->dma_sfcr);
+	stm32_dma_write(dmadev, STM32_DMA_SM1AR(chan->id), reg->dma_sm1ar);
+	stm32_dma_write(dmadev, STM32_DMA_SNDTR(chan->id), reg->dma_sndtr);
+
+	chan->next_sg++;
+
+	/* Clear interrupt status if it is there */
+	status = stm32_dma_irq_status(chan);
+	if (status)
+		stm32_dma_irq_clear(chan, status);
+
+	stm32_dma_dump_reg(chan);
+
+	/* Start DMA */
+	reg->dma_scr |= STM32_DMA_SCR_EN;
+	stm32_dma_write(dmadev, STM32_DMA_SCR(chan->id), reg->dma_scr);
+
+	chan->busy = true;
+
+	return 0;
+}
+
+static void stm32_dma_configure_next_sg(struct stm32_dma_chan *chan)
+{
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	struct stm32_dma_sg_req *sg_req;
+	u32 dma_scr, dma_sm0ar, dma_sm1ar, id;
+
+	id = chan->id;
+	dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(id));
+
+	if (dma_scr & STM32_DMA_SCR_DBM) {
+		if (chan->next_sg == chan->desc->num_sgs)
+			chan->next_sg = 0;
+
+		sg_req = &chan->desc->sg_req[chan->next_sg];
+
+		if (dma_scr & STM32_DMA_SCR_CT) {
+			dma_sm0ar = sg_req->chan_reg.dma_sm0ar;
+			stm32_dma_write(dmadev, STM32_DMA_SM0AR(id), dma_sm0ar);
+			dev_dbg(chan2dev(chan), "CT=1 <=> SM0AR: 0x%08x\n",
+				stm32_dma_read(dmadev, STM32_DMA_SM0AR(id)));
+		} else {
+			dma_sm1ar = sg_req->chan_reg.dma_sm1ar;
+			stm32_dma_write(dmadev, STM32_DMA_SM1AR(id), dma_sm1ar);
+			dev_dbg(chan2dev(chan), "CT=0 <=> SM1AR: 0x%08x\n",
+				stm32_dma_read(dmadev, STM32_DMA_SM1AR(id)));
+		}
+
+		chan->next_sg++;
+	}
+}
+
+static void stm32_dma_handle_chan_done(struct stm32_dma_chan *chan)
+{
+	if (chan->desc) {
+		if (chan->desc->cyclic) {
+			vchan_cyclic_callback(&chan->desc->vdesc);
+			stm32_dma_configure_next_sg(chan);
+		} else {
+			chan->busy = false;
+			if (chan->next_sg == chan->desc->num_sgs) {
+				list_del(&chan->desc->vdesc.node);
+				vchan_cookie_complete(&chan->desc->vdesc);
+				chan->desc = NULL;
+			}
+			stm32_dma_start_transfer(chan);
+		}
+	}
+}
+
+static irqreturn_t stm32_dma_chan_irq(int irq, void *devid)
+{
+	struct stm32_dma_chan *chan = devid;
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	u32 status, scr, sfcr;
+
+	spin_lock(&chan->vchan.lock);
+
+	status = stm32_dma_irq_status(chan);
+	scr = stm32_dma_read(dmadev, STM32_DMA_SCR(chan->id));
+	sfcr = stm32_dma_read(dmadev, STM32_DMA_SFCR(chan->id));
+
+	if ((status & STM32_DMA_TCI) && (scr & STM32_DMA_SCR_TCIE)) {
+		stm32_dma_irq_clear(chan, STM32_DMA_TCI);
+		stm32_dma_handle_chan_done(chan);
+
+	} else {
+		stm32_dma_irq_clear(chan, status);
+		dev_err(chan2dev(chan), "DMA error: status=0x%08x\n", status);
+	}
+
+	spin_unlock(&chan->vchan.lock);
+
+	return IRQ_HANDLED;
+}
+
+static void stm32_dma_issue_pending(struct dma_chan *c)
+{
+	struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&chan->vchan.lock, flags);
+	if (!chan->busy) {
+		if (vchan_issue_pending(&chan->vchan) && !chan->desc) {
+			ret = stm32_dma_start_transfer(chan);
+			if ((chan->desc->cyclic) && (!ret))
+				stm32_dma_configure_next_sg(chan);
+		}
+	}
+	spin_unlock_irqrestore(&chan->vchan.lock, flags);
+}
+
+static int stm32_dma_set_xfer_param(struct stm32_dma_chan *chan,
+				    enum dma_transfer_direction direction,
+				    enum dma_slave_buswidth *buswidth)
+{
+	enum dma_slave_buswidth src_addr_width, dst_addr_width;
+	int src_bus_width, dst_bus_width;
+	int src_burst_size, dst_burst_size;
+	u32 src_maxburst, dst_maxburst;
+	dma_addr_t src_addr, dst_addr;
+	u32 dma_scr = 0;
+
+	src_addr_width = chan->dma_sconfig.src_addr_width;
+	dst_addr_width = chan->dma_sconfig.dst_addr_width;
+	src_maxburst = chan->dma_sconfig.src_maxburst;
+	dst_maxburst = chan->dma_sconfig.dst_maxburst;
+	src_addr = chan->dma_sconfig.src_addr;
+	dst_addr = chan->dma_sconfig.dst_addr;
+
+	switch (direction) {
+	case DMA_MEM_TO_DEV:
+		dst_bus_width = stm32_dma_get_width(chan, dst_addr_width);
+		if (dst_bus_width < 0)
+			return dst_bus_width;
+
+		dst_burst_size = stm32_dma_get_burst(chan, dst_maxburst);
+		if (dst_burst_size < 0)
+			return dst_burst_size;
+
+		if (!src_addr_width)
+			src_addr_width = dst_addr_width;
+
+		src_bus_width = stm32_dma_get_width(chan, src_addr_width);
+		if (src_bus_width < 0)
+			return src_bus_width;
+
+		src_burst_size = stm32_dma_get_burst(chan, src_maxburst);
+		if (src_burst_size < 0)
+			return src_burst_size;
+
+		dma_scr = STM32_DMA_SCR_DIR(STM32_DMA_MEM_TO_DEV) |
+			STM32_DMA_SCR_PSIZE(dst_bus_width) |
+			STM32_DMA_SCR_MSIZE(src_bus_width) |
+			STM32_DMA_SCR_PBURST(dst_burst_size) |
+			STM32_DMA_SCR_MBURST(src_burst_size);
+
+		chan->chan_reg.dma_spar = chan->dma_sconfig.dst_addr;
+		*buswidth = dst_addr_width;
+		break;
+
+	case DMA_DEV_TO_MEM:
+		src_bus_width = stm32_dma_get_width(chan, src_addr_width);
+		if (src_bus_width < 0)
+			return src_bus_width;
+
+		src_burst_size = stm32_dma_get_burst(chan, src_maxburst);
+		if (src_burst_size < 0)
+			return src_burst_size;
+
+		if (!dst_addr_width)
+			dst_addr_width = src_addr_width;
+
+		dst_bus_width = stm32_dma_get_width(chan, dst_addr_width);
+		if (dst_bus_width < 0)
+			return dst_bus_width;
+
+		dst_burst_size = stm32_dma_get_burst(chan, dst_maxburst);
+		if (dst_burst_size < 0)
+			return dst_burst_size;
+
+		dma_scr = STM32_DMA_SCR_DIR(STM32_DMA_DEV_TO_MEM) |
+			STM32_DMA_SCR_PSIZE(src_bus_width) |
+			STM32_DMA_SCR_MSIZE(dst_bus_width) |
+			STM32_DMA_SCR_PBURST(src_burst_size) |
+			STM32_DMA_SCR_MBURST(dst_burst_size);
+
+		chan->chan_reg.dma_spar = chan->dma_sconfig.src_addr;
+		*buswidth = chan->dma_sconfig.src_addr_width;
+		break;
+
+	default:
+		dev_err(chan2dev(chan), "Dma direction is not supported\n");
+		return -EINVAL;
+	}
+
+	stm32_dma_set_fifo_config(chan, src_maxburst, dst_maxburst);
+
+	chan->chan_reg.dma_scr &= ~(STM32_DMA_SCR_DIR_MASK |
+			STM32_DMA_SCR_PSIZE_MASK | STM32_DMA_SCR_MSIZE_MASK |
+			STM32_DMA_SCR_PBURST_MASK | STM32_DMA_SCR_MBURST_MASK);
+	chan->chan_reg.dma_scr |= dma_scr;
+
+	return 0;
+}
+
+static void stm32_dma_clear_reg(struct stm32_dma_chan_reg *regs)
+{
+	memset(regs, 0, sizeof(struct stm32_dma_chan_reg));
+}
+
+static struct dma_async_tx_descriptor *stm32_dma_prep_slave_sg(
+	struct dma_chan *c, struct scatterlist *sgl,
+	u32 sg_len, enum dma_transfer_direction direction,
+	unsigned long flags, void *context)
+{
+	struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
+	struct stm32_dma_desc *desc;
+	struct scatterlist *sg;
+	enum dma_slave_buswidth buswidth;
+	u32 nb_data_items;
+	int i, ret;
+
+	if (!chan->config_init) {
+		dev_err(chan2dev(chan), "dma channel is not configured\n");
+		return NULL;
+	}
+
+	if (sg_len < 1) {
+		dev_err(chan2dev(chan), "Invalid segment length %d\n", sg_len);
+		return NULL;
+	}
+
+	desc = stm32_dma_alloc_desc(sg_len);
+	if (!desc)
+		return NULL;
+
+	ret = stm32_dma_set_xfer_param(chan, direction, &buswidth);
+	if (ret < 0)
+		goto err;
+
+	/* Set peripheral flow controller */
+	if (chan->dma_sconfig.device_fc)
+		chan->chan_reg.dma_scr |= STM32_DMA_SCR_PFCTRL;
+	else
+		chan->chan_reg.dma_scr &= ~STM32_DMA_SCR_PFCTRL;
+
+	for_each_sg(sgl, sg, sg_len, i) {
+		desc->sg_req[i].len = sg_dma_len(sg);
+
+		nb_data_items = desc->sg_req[i].len / buswidth;
+		if (nb_data_items > STM32_DMA_MAX_DATA_ITEMS) {
+			dev_err(chan2dev(chan), "nb items not supported\n");
+			goto err;
+		}
+
+		stm32_dma_clear_reg(&desc->sg_req[i].chan_reg);
+		desc->sg_req[i].chan_reg.dma_scr = chan->chan_reg.dma_scr;
+		desc->sg_req[i].chan_reg.dma_sfcr = chan->chan_reg.dma_sfcr;
+		desc->sg_req[i].chan_reg.dma_spar = chan->chan_reg.dma_spar;
+		desc->sg_req[i].chan_reg.dma_sm0ar = sg_dma_address(sg);
+		desc->sg_req[i].chan_reg.dma_sm1ar = sg_dma_address(sg);
+		desc->sg_req[i].chan_reg.dma_sndtr = nb_data_items;
+	}
+
+	desc->num_sgs = sg_len;
+	desc->cyclic = false;
+
+	return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
+
+err:
+	kfree(desc);
+	return NULL;
+}
+
+static struct dma_async_tx_descriptor *stm32_dma_prep_dma_cyclic(
+	struct dma_chan *c, dma_addr_t buf_addr, size_t buf_len,
+	size_t period_len, enum dma_transfer_direction direction,
+	unsigned long flags)
+{
+	struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
+	struct stm32_dma_desc *desc;
+	enum dma_slave_buswidth buswidth;
+	u32 num_periods, nb_data_items;
+	int i, ret;
+
+	if (!buf_len || !period_len) {
+		dev_err(chan2dev(chan), "Invalid buffer/period len\n");
+		return NULL;
+	}
+
+	if (!chan->config_init) {
+		dev_err(chan2dev(chan), "dma channel is not configured\n");
+		return NULL;
+	}
+
+	if (buf_len % period_len) {
+		dev_err(chan2dev(chan), "buf_len not multiple of period_len\n");
+		return NULL;
+	}
+
+	/*
+	 * We allow to take more number of requests till DMA is
+	 * not started. The driver will loop over all requests.
+	 * Once DMA is started then new requests can be queued only after
+	 * terminating the DMA.
+	 */
+	if (chan->busy) {
+		dev_err(chan2dev(chan), "Request not allowed when dma busy\n");
+		return NULL;
+	}
+
+	ret = stm32_dma_set_xfer_param(chan, direction, &buswidth);
+	if (ret < 0)
+		return NULL;
+
+	nb_data_items = period_len / buswidth;
+	if (nb_data_items > STM32_DMA_MAX_DATA_ITEMS) {
+		dev_err(chan2dev(chan), "number of items not supported\n");
+		return NULL;
+	}
+
+	/*  Enable Circular mode or double buffer mode */
+	if (buf_len == period_len)
+		chan->chan_reg.dma_scr |= STM32_DMA_SCR_CIRC;
+	else
+		chan->chan_reg.dma_scr |= STM32_DMA_SCR_DBM;
+
+	/* Clear periph ctrl if client set it */
+	chan->chan_reg.dma_scr &= ~STM32_DMA_SCR_PFCTRL;
+
+	num_periods = buf_len / period_len;
+
+	desc = stm32_dma_alloc_desc(num_periods);
+	if (!desc)
+		return NULL;
+
+	for (i = 0; i < num_periods; i++) {
+		desc->sg_req[i].len = period_len;
+
+		stm32_dma_clear_reg(&desc->sg_req[i].chan_reg);
+		desc->sg_req[i].chan_reg.dma_scr = chan->chan_reg.dma_scr;
+		desc->sg_req[i].chan_reg.dma_sfcr = chan->chan_reg.dma_sfcr;
+		desc->sg_req[i].chan_reg.dma_spar = chan->chan_reg.dma_spar;
+		desc->sg_req[i].chan_reg.dma_sm0ar = buf_addr;
+		desc->sg_req[i].chan_reg.dma_sm1ar = buf_addr;
+		desc->sg_req[i].chan_reg.dma_sndtr = nb_data_items;
+		buf_addr += period_len;
+	}
+
+	desc->num_sgs = num_periods;
+	desc->cyclic = true;
+
+	return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
+}
+
+static struct dma_async_tx_descriptor *stm32_dma_prep_dma_memcpy(
+	struct dma_chan *c, dma_addr_t dest,
+	dma_addr_t src, size_t len, unsigned long flags)
+{
+	struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
+	u32 num_sgs;
+	struct stm32_dma_desc *desc;
+	size_t xfer_count, offset;
+	int i;
+
+	num_sgs = DIV_ROUND_UP(len, STM32_DMA_MAX_DATA_ITEMS);
+	desc = stm32_dma_alloc_desc(num_sgs);
+	if (!desc)
+		return NULL;
+
+	for (offset = 0, i = 0; offset < len; offset += xfer_count, i++) {
+		xfer_count = min_t(size_t, len - offset,
+				   STM32_DMA_MAX_DATA_ITEMS);
+
+		desc->sg_req[i].len = xfer_count;
+
+		stm32_dma_clear_reg(&desc->sg_req[i].chan_reg);
+		desc->sg_req[i].chan_reg.dma_scr =
+			STM32_DMA_SCR_DIR(STM32_DMA_MEM_TO_MEM) |
+			STM32_DMA_SCR_MINC |
+			STM32_DMA_SCR_PINC |
+			STM32_DMA_SCR_TCIE |
+			STM32_DMA_SCR_TEIE;
+		desc->sg_req[i].chan_reg.dma_sfcr = STM32_DMA_SFCR_DMDIS |
+			STM32_DMA_SFCR_FTH(STM32_DMA_FIFO_THRESHOLD_FULL) |
+			STM32_DMA_SFCR_FEIE;
+		desc->sg_req[i].chan_reg.dma_spar = src + offset;
+		desc->sg_req[i].chan_reg.dma_sm0ar = dest + offset;
+		desc->sg_req[i].chan_reg.dma_sndtr = xfer_count;
+	}
+
+	desc->num_sgs = num_sgs;
+	desc->cyclic = false;
+
+	return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
+}
+
+static size_t stm32_dma_desc_residue(struct stm32_dma_chan *chan,
+				     struct stm32_dma_desc *desc,
+				     u32 next_sg)
+{
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	u32 dma_scr, width, residue, count;
+	int i;
+
+	residue = 0;
+
+	for (i = next_sg; i < desc->num_sgs; i++)
+		residue += desc->sg_req[i].len;
+
+	if (next_sg != 0) {
+		dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(chan->id));
+		width = STM32_DMA_SCR_PSIZE_GET(dma_scr);
+		count = stm32_dma_read(dmadev, STM32_DMA_SNDTR(chan->id));
+
+		residue += count << width;
+	}
+
+	return residue;
+}
+
+static enum dma_status stm32_dma_tx_status(struct dma_chan *c,
+					   dma_cookie_t cookie,
+					   struct dma_tx_state *state)
+{
+	struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
+	struct virt_dma_desc *vdesc;
+	enum dma_status status;
+	unsigned long flags;
+	u32 residue;
+
+	status = dma_cookie_status(c, cookie, state);
+	if ((status == DMA_COMPLETE) || (!state))
+		return status;
+
+	spin_lock_irqsave(&chan->vchan.lock, flags);
+	vdesc = vchan_find_desc(&chan->vchan, cookie);
+	if (cookie == chan->desc->vdesc.tx.cookie) {
+		residue = stm32_dma_desc_residue(chan, chan->desc,
+						 chan->next_sg);
+	} else if (vdesc) {
+		residue = stm32_dma_desc_residue(chan,
+						 to_stm32_dma_desc(vdesc), 0);
+	} else {
+		residue = 0;
+	}
+
+	dma_set_residue(state, residue);
+
+	spin_unlock_irqrestore(&chan->vchan.lock, flags);
+
+	return status;
+}
+
+static int stm32_dma_alloc_chan_resources(struct dma_chan *c)
+{
+	struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	int ret;
+
+	chan->config_init = false;
+	ret = clk_prepare_enable(dmadev->clk);
+	if (ret < 0) {
+		dev_err(chan2dev(chan), "clk_prepare_enable failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = stm32_dma_disable_chan(chan);
+	if (ret < 0)
+		clk_disable_unprepare(dmadev->clk);
+
+	return ret;
+}
+
+static void stm32_dma_free_chan_resources(struct dma_chan *c)
+{
+	struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
+	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
+	unsigned long flags;
+
+	dev_dbg(chan2dev(chan), "Freeing channel %d\n", chan->id);
+
+	if (chan->busy) {
+		spin_lock_irqsave(&chan->vchan.lock, flags);
+		stm32_dma_stop(chan);
+		chan->desc = NULL;
+		spin_unlock_irqrestore(&chan->vchan.lock, flags);
+	}
+
+	clk_disable_unprepare(dmadev->clk);
+
+	vchan_free_chan_resources(to_virt_chan(c));
+}
+
+static void stm32_dma_desc_free(struct virt_dma_desc *vdesc)
+{
+	kfree(container_of(vdesc, struct stm32_dma_desc, vdesc));
+}
+
+void stm32_dma_set_config(struct stm32_dma_chan *chan,
+			  struct stm32_dma_cfg *cfg)
+{
+	stm32_dma_clear_reg(&chan->chan_reg);
+
+	chan->chan_reg.dma_scr = cfg->stream_config & STM32_DMA_SCR_CFG_MASK;
+	chan->chan_reg.dma_scr |= STM32_DMA_SCR_REQ(cfg->request_line);
+
+	/* Enable Interrupts  */
+	chan->chan_reg.dma_scr |= STM32_DMA_SCR_TEIE | STM32_DMA_SCR_TCIE;
+
+	chan->chan_reg.dma_sfcr = cfg->threshold & STM32_DMA_SFCR_FTH_MASK;
+}
+
+static struct dma_chan *stm32_dma_of_xlate(struct of_phandle_args *dma_spec,
+					   struct of_dma *ofdma)
+{
+	struct stm32_dma_device *dmadev = ofdma->of_dma_data;
+	struct stm32_dma_cfg cfg;
+	struct stm32_dma_chan *chan;
+	struct dma_chan *c;
+
+	if (dma_spec->args_count < 3)
+		return NULL;
+
+	cfg.channel_id = dma_spec->args[0];
+	cfg.request_line = dma_spec->args[1];
+	cfg.stream_config = dma_spec->args[2];
+	cfg.threshold = 0;
+
+	if ((cfg.channel_id >= STM32_DMA_MAX_CHANNELS) || (cfg.request_line >=
+				STM32_DMA_MAX_REQUEST_ID))
+		return NULL;
+
+	if (dma_spec->args_count > 3)
+		cfg.threshold = dma_spec->args[3];
+
+	chan = &dmadev->chan[cfg.channel_id];
+
+	c = dma_get_slave_channel(&chan->vchan.chan);
+	if (c)
+		stm32_dma_set_config(chan, &cfg);
+
+	return c;
+}
+
+static const struct of_device_id stm32_dma_of_match[] = {
+	{ .compatible = "st,stm32-dma", },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, stm32_dma_of_match);
+
+static int stm32_dma_probe(struct platform_device *pdev)
+{
+	struct stm32_dma_chan *chan;
+	struct stm32_dma_device *dmadev;
+	struct dma_device *dd;
+	const struct of_device_id *match;
+	struct resource *res;
+	int i, ret;
+
+	match = of_match_device(stm32_dma_of_match, &pdev->dev);
+	if (!match) {
+		dev_err(&pdev->dev, "Error: No device match found\n");
+		return -ENODEV;
+	}
+
+	dmadev = devm_kzalloc(&pdev->dev, sizeof(*dmadev), GFP_KERNEL);
+	if (!dmadev)
+		return -ENOMEM;
+
+	dd = &dmadev->ddev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	dmadev->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(dmadev->base))
+		return PTR_ERR(dmadev->base);
+
+	dmadev->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(dmadev->clk)) {
+		dev_err(&pdev->dev, "Error: Missing controller clock\n");
+		return PTR_ERR(dmadev->clk);
+	}
+
+	dmadev->mem2mem = of_property_read_bool(pdev->dev.of_node,
+						"st,mem2mem");
+
+	dmadev->rst = devm_reset_control_get(&pdev->dev, NULL);
+	if (!IS_ERR(dmadev->rst)) {
+		reset_control_assert(dmadev->rst);
+		udelay(2);
+		reset_control_deassert(dmadev->rst);
+	}
+
+	dma_cap_set(DMA_SLAVE, dd->cap_mask);
+	dma_cap_set(DMA_PRIVATE, dd->cap_mask);
+	dma_cap_set(DMA_CYCLIC, dd->cap_mask);
+	dd->device_alloc_chan_resources = stm32_dma_alloc_chan_resources;
+	dd->device_free_chan_resources = stm32_dma_free_chan_resources;
+	dd->device_tx_status = stm32_dma_tx_status;
+	dd->device_issue_pending = stm32_dma_issue_pending;
+	dd->device_prep_slave_sg = stm32_dma_prep_slave_sg;
+	dd->device_prep_dma_cyclic = stm32_dma_prep_dma_cyclic;
+	dd->device_config = stm32_dma_slave_config;
+	dd->device_terminate_all = stm32_dma_terminate_all;
+	dd->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
+		BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
+		BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+	dd->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
+		BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
+		BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+	dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
+	dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
+	dd->dev = &pdev->dev;
+	INIT_LIST_HEAD(&dd->channels);
+
+	if (dmadev->mem2mem) {
+		dma_cap_set(DMA_MEMCPY, dd->cap_mask);
+		dd->device_prep_dma_memcpy = stm32_dma_prep_dma_memcpy;
+		dd->directions |= BIT(DMA_MEM_TO_MEM);
+	}
+
+	for (i = 0; i < STM32_DMA_MAX_CHANNELS; i++) {
+		chan = &dmadev->chan[i];
+		chan->id = i;
+		chan->vchan.desc_free = stm32_dma_desc_free;
+		vchan_init(&chan->vchan, dd);
+	}
+
+	ret = dma_async_device_register(dd);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < STM32_DMA_MAX_CHANNELS; i++) {
+		chan = &dmadev->chan[i];
+		res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
+		if (!res) {
+			ret = -EINVAL;
+			dev_err(&pdev->dev, "No irq resource for chan %d\n", i);
+			goto err_unregister;
+		}
+		chan->irq = res->start;
+		ret = devm_request_irq(&pdev->dev, chan->irq,
+				       stm32_dma_chan_irq, 0,
+				       dev_name(chan2dev(chan)), chan);
+		if (ret) {
+			dev_err(&pdev->dev,
+				"request_irq failed with err %d channel %d\n",
+				ret, i);
+			goto err_unregister;
+		}
+	}
+
+	ret = of_dma_controller_register(pdev->dev.of_node,
+					 stm32_dma_of_xlate, dmadev);
+	if (ret < 0) {
+		dev_err(&pdev->dev,
+			"STM32 DMA DMA OF registration failed %d\n", ret);
+		goto err_unregister;
+	}
+
+	platform_set_drvdata(pdev, dmadev);
+
+	dev_info(&pdev->dev, "STM32 DMA driver registered\n");
+
+	return 0;
+
+err_unregister:
+	dma_async_device_unregister(dd);
+
+	return ret;
+}
+
+static struct platform_driver stm32_dma_driver = {
+	.driver = {
+		.name = "stm32-dma",
+		.of_match_table = stm32_dma_of_match,
+	},
+};
+
+static int __init stm32_dma_init(void)
+{
+	return platform_driver_probe(&stm32_dma_driver, stm32_dma_probe);
+}
+subsys_initcall(stm32_dma_init);
-- 
1.9.1

[PATCH v4 3/4] ARM: dts: Add STM32 DMA support for STM32F429 MCU

[M'boumba Cedric Madianga]

This patch adds STM32 DMA bindings for STM32F429.

Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
---
 arch/arm/boot/dts/stm32f429.dtsi | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/arch/arm/boot/dts/stm32f429.dtsi b/arch/arm/boot/dts/stm32f429.dtsi
index d78a481..037eb29 100644
--- a/arch/arm/boot/dts/stm32f429.dtsi
+++ b/arch/arm/boot/dts/stm32f429.dtsi
@@ -174,6 +174,37 @@
 			reg = <0x40023800 0x400>;
 			clocks = <&clk_hse>;
 		};
+
+		dma1: dma-controller@40026000 {
+			compatible = "st,stm32-dma";
+			reg = <0x40026000 0x400>;
+			interrupts = <11>,
+				     <12>,
+				     <13>,
+				     <14>,
+				     <15>,
+				     <16>,
+				     <17>,
+				     <47>;
+			clocks = <&rcc 0 21>;
+			#dma-cells = <4>;
+		};
+
+		dma2: dma-controller@40026400 {
+			compatible = "st,stm32-dma";
+			reg = <0x40026400 0x400>;
+			interrupts = <56>,
+				     <57>,
+				     <58>,
+				     <59>,
+				     <60>,
+				     <68>,
+				     <69>,
+				     <70>;
+			clocks = <&rcc 0 22>;
+			#dma-cells = <4>;
+			st,mem2mem;
+		};
 	};
 };
 
-- 
1.9.1

[PATCH v4 3/4] ARM: dts: Add STM32 DMA support for STM32F429 MCU

[M'boumba Cedric Madianga]

This patch adds STM32 DMA bindings for STM32F429.

Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
---
 arch/arm/boot/dts/stm32f429.dtsi | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/arch/arm/boot/dts/stm32f429.dtsi b/arch/arm/boot/dts/stm32f429.dtsi
index d78a481..037eb29 100644
--- a/arch/arm/boot/dts/stm32f429.dtsi
+++ b/arch/arm/boot/dts/stm32f429.dtsi
@@ -174,6 +174,37 @@
 			reg = <0x40023800 0x400>;
 			clocks = <&clk_hse>;
 		};
+
+		dma1: dma-controller at 40026000 {
+			compatible = "st,stm32-dma";
+			reg = <0x40026000 0x400>;
+			interrupts = <11>,
+				     <12>,
+				     <13>,
+				     <14>,
+				     <15>,
+				     <16>,
+				     <17>,
+				     <47>;
+			clocks = <&rcc 0 21>;
+			#dma-cells = <4>;
+		};
+
+		dma2: dma-controller at 40026400 {
+			compatible = "st,stm32-dma";
+			reg = <0x40026400 0x400>;
+			interrupts = <56>,
+				     <57>,
+				     <58>,
+				     <59>,
+				     <60>,
+				     <68>,
+				     <69>,
+				     <70>;
+			clocks = <&rcc 0 22>;
+			#dma-cells = <4>;
+			st,mem2mem;
+		};
 	};
 };
 
-- 
1.9.1

[PATCH v4 4/4] ARM: configs: Add STM32 DMA support in STM32 defconfig

[M'boumba Cedric Madianga]

This patch adds STM32 DMA support in stm32_defconfig file

Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
---
 arch/arm/configs/stm32_defconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/configs/stm32_defconfig b/arch/arm/configs/stm32_defconfig
index 4725fab..ec52505 100644
--- a/arch/arm/configs/stm32_defconfig
+++ b/arch/arm/configs/stm32_defconfig
@@ -54,6 +54,8 @@ CONFIG_NEW_LEDS=y
 CONFIG_LEDS_CLASS=y
 CONFIG_LEDS_TRIGGERS=y
 CONFIG_LEDS_TRIGGER_HEARTBEAT=y
+CONFIG_DMADEVICES=y
+CONFIG_STM32_DMA=y
 # CONFIG_FILE_LOCKING is not set
 # CONFIG_DNOTIFY is not set
 # CONFIG_INOTIFY_USER is not set
-- 
1.9.1

[PATCH v4 4/4] ARM: configs: Add STM32 DMA support in STM32 defconfig

[M'boumba Cedric Madianga]

This patch adds STM32 DMA support in stm32_defconfig file

Signed-off-by: M'boumba Cedric Madianga <cedric.madianga-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 arch/arm/configs/stm32_defconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/configs/stm32_defconfig b/arch/arm/configs/stm32_defconfig
index 4725fab..ec52505 100644
--- a/arch/arm/configs/stm32_defconfig
+++ b/arch/arm/configs/stm32_defconfig
@@ -54,6 +54,8 @@ CONFIG_NEW_LEDS=y
 CONFIG_LEDS_CLASS=y
 CONFIG_LEDS_TRIGGERS=y
 CONFIG_LEDS_TRIGGER_HEARTBEAT=y
+CONFIG_DMADEVICES=y
+CONFIG_STM32_DMA=y
 # CONFIG_FILE_LOCKING is not set
 # CONFIG_DNOTIFY is not set
 # CONFIG_INOTIFY_USER is not set
-- 
1.9.1

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[PATCH v4 4/4] ARM: configs: Add STM32 DMA support in STM32 defconfig

[M'boumba Cedric Madianga]

This patch adds STM32 DMA support in stm32_defconfig file

Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
---
 arch/arm/configs/stm32_defconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/configs/stm32_defconfig b/arch/arm/configs/stm32_defconfig
index 4725fab..ec52505 100644
--- a/arch/arm/configs/stm32_defconfig
+++ b/arch/arm/configs/stm32_defconfig
@@ -54,6 +54,8 @@ CONFIG_NEW_LEDS=y
 CONFIG_LEDS_CLASS=y
 CONFIG_LEDS_TRIGGERS=y
 CONFIG_LEDS_TRIGGER_HEARTBEAT=y
+CONFIG_DMADEVICES=y
+CONFIG_STM32_DMA=y
 # CONFIG_FILE_LOCKING is not set
 # CONFIG_DNOTIFY is not set
 # CONFIG_INOTIFY_USER is not set
-- 
1.9.1

Re: [PATCH v4 1/4] dt-bindings: Document the STM32 DMA bindings

[Rob Herring]

On Fri, Oct 16, 2015 at 8:59 AM, M'boumba Cedric Madianga
<cedric.madianga@gmail.com> wrote:
> This patch adds documentation of device tree bindings for the STM32 dma
> controller.
>
> Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
> ---
>  .../devicetree/bindings/dma/stm32-dma.txt          | 82 ++++++++++++++++++++++

Acked-by: Rob Herring <robh@kernel.org>

>  1 file changed, 82 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/dma/stm32-dma.txt
>
> diff --git a/Documentation/devicetree/bindings/dma/stm32-dma.txt b/Documentation/devicetree/bindings/dma/stm32-dma.txt
> new file mode 100644
> index 0000000..70cd13f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/stm32-dma.txt
> @@ -0,0 +1,82 @@
> +* STMicroelectronics STM32 DMA controller
> +
> +The STM32 DMA is a general-purpose direct memory access controller capable of
> +supporting 8 independent DMA channels. Each channel can have up to 8 requests.
> +
> +Required properties:
> +- compatible: Should be "st,stm32-dma"
> +- reg: Should contain DMA registers location and length. This should include
> +  all of the per-channel registers.
> +- interrupts: Should contain all of the per-channel DMA interrupts in
> +  ascending order with respect to the DMA channel index.
> +- clocks: Should contain the input clock of the DMA instance.
> +- #dma-cells : Must be <4>. See DMA client paragraph for more details.
> +
> +Optional properties:
> +- resets: Reference to a reset controller asserting the DMA controller
> +- st,mem2mem: boolean; if defined, it indicates that the controller supports
> +  memory-to-memory transfer
> +
> +Example:
> +
> +       dma2: dma-controller@40026400 {
> +               compatible = "st,stm32-dma";
> +               reg = <0x40026400 0x400>;
> +               interrupts = <56>,
> +                            <57>,
> +                            <58>,
> +                            <59>,
> +                            <60>,
> +                            <68>,
> +                            <69>,
> +                            <70>;
> +               clocks = <&clk_hclk>;
> +               #dma-cells = <4>;
> +               st,mem2mem;
> +               resets = <&rcc 150>;
> +       };
> +
> +* DMA client
> +
> +DMA clients connected to the STM32 DMA controller must use the format
> +described in the dma.txt file, using a five-cell specifier for each
> +channel: a phandle plus four integer cells.
> +The four cells in order are:
> +
> +1. The channel id
> +2. The request line number
> +3. A 32bit mask specifying the DMA channel configuration which are device
> +   dependent:
> +  -bit 9: Peripheral Increment Address
> +       0x0: no address increment between transfers
> +       0x1: increment address between transfers
> + -bit 10: Memory Increment Address
> +       0x0: no address increment between transfers
> +       0x1: increment address between transfers
> + -bit 15: Peripheral Increment Offset Size
> +       0x0: offset size is linked to the peripheral bus width
> +       0x1: offset size is fixed to 4 (32-bit alignment)
> + -bit 16-17: Priority level
> +       0x0: low
> +       0x1: medium
> +       0x2: high
> +       0x3: very high
> +5. A 32bit mask specifying the DMA FIFO threshold configuration which are device
> +   dependent:
> + -bit 0-1: Fifo threshold
> +       0x0: 1/4 full FIFO
> +       0x1: 1/2 full FIFO
> +       0x2: 3/4 full FIFO
> +       0x3: full FIFO
> +
> +Example:
> +
> +       usart1: serial@40011000 {
> +               compatible = "st,stm32-usart", "st,stm32-uart";
> +               reg = <0x40011000 0x400>;
> +               interrupts = <37>;
> +               clocks = <&clk_pclk2>;
> +               dmas = <&dma2 2 4 0x10400 0x3>,
> +                      <&dma2 7 5 0x10200 0x3>;
> +               dma-names = "rx", "tx";
> +       };
> --
> 1.9.1
>

Re: [PATCH v4 1/4] dt-bindings: Document the STM32 DMA bindings

[Rob Herring]

On Fri, Oct 16, 2015 at 8:59 AM, M'boumba Cedric Madianga
<cedric.madianga@gmail.com> wrote:
> This patch adds documentation of device tree bindings for the STM32 dma
> controller.
>
> Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
> ---
>  .../devicetree/bindings/dma/stm32-dma.txt          | 82 ++++++++++++++++++++++

Acked-by: Rob Herring <robh@kernel.org>

>  1 file changed, 82 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/dma/stm32-dma.txt
>
> diff --git a/Documentation/devicetree/bindings/dma/stm32-dma.txt b/Documentation/devicetree/bindings/dma/stm32-dma.txt
> new file mode 100644
> index 0000000..70cd13f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/stm32-dma.txt
> @@ -0,0 +1,82 @@
> +* STMicroelectronics STM32 DMA controller
> +
> +The STM32 DMA is a general-purpose direct memory access controller capable of
> +supporting 8 independent DMA channels. Each channel can have up to 8 requests.
> +
> +Required properties:
> +- compatible: Should be "st,stm32-dma"
> +- reg: Should contain DMA registers location and length. This should include
> +  all of the per-channel registers.
> +- interrupts: Should contain all of the per-channel DMA interrupts in
> +  ascending order with respect to the DMA channel index.
> +- clocks: Should contain the input clock of the DMA instance.
> +- #dma-cells : Must be <4>. See DMA client paragraph for more details.
> +
> +Optional properties:
> +- resets: Reference to a reset controller asserting the DMA controller
> +- st,mem2mem: boolean; if defined, it indicates that the controller supports
> +  memory-to-memory transfer
> +
> +Example:
> +
> +       dma2: dma-controller@40026400 {
> +               compatible = "st,stm32-dma";
> +               reg = <0x40026400 0x400>;
> +               interrupts = <56>,
> +                            <57>,
> +                            <58>,
> +                            <59>,
> +                            <60>,
> +                            <68>,
> +                            <69>,
> +                            <70>;
> +               clocks = <&clk_hclk>;
> +               #dma-cells = <4>;
> +               st,mem2mem;
> +               resets = <&rcc 150>;
> +       };
> +
> +* DMA client
> +
> +DMA clients connected to the STM32 DMA controller must use the format
> +described in the dma.txt file, using a five-cell specifier for each
> +channel: a phandle plus four integer cells.
> +The four cells in order are:
> +
> +1. The channel id
> +2. The request line number
> +3. A 32bit mask specifying the DMA channel configuration which are device
> +   dependent:
> +  -bit 9: Peripheral Increment Address
> +       0x0: no address increment between transfers
> +       0x1: increment address between transfers
> + -bit 10: Memory Increment Address
> +       0x0: no address increment between transfers
> +       0x1: increment address between transfers
> + -bit 15: Peripheral Increment Offset Size
> +       0x0: offset size is linked to the peripheral bus width
> +       0x1: offset size is fixed to 4 (32-bit alignment)
> + -bit 16-17: Priority level
> +       0x0: low
> +       0x1: medium
> +       0x2: high
> +       0x3: very high
> +5. A 32bit mask specifying the DMA FIFO threshold configuration which are device
> +   dependent:
> + -bit 0-1: Fifo threshold
> +       0x0: 1/4 full FIFO
> +       0x1: 1/2 full FIFO
> +       0x2: 3/4 full FIFO
> +       0x3: full FIFO
> +
> +Example:
> +
> +       usart1: serial@40011000 {
> +               compatible = "st,stm32-usart", "st,stm32-uart";
> +               reg = <0x40011000 0x400>;
> +               interrupts = <37>;
> +               clocks = <&clk_pclk2>;
> +               dmas = <&dma2 2 4 0x10400 0x3>,
> +                      <&dma2 7 5 0x10200 0x3>;
> +               dma-names = "rx", "tx";
> +       };
> --
> 1.9.1
>

[PATCH v4 1/4] dt-bindings: Document the STM32 DMA bindings

[Rob Herring]

On Fri, Oct 16, 2015 at 8:59 AM, M'boumba Cedric Madianga
<cedric.madianga@gmail.com> wrote:
> This patch adds documentation of device tree bindings for the STM32 dma
> controller.
>
> Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
> ---
>  .../devicetree/bindings/dma/stm32-dma.txt          | 82 ++++++++++++++++++++++

Acked-by: Rob Herring <robh@kernel.org>

>  1 file changed, 82 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/dma/stm32-dma.txt
>
> diff --git a/Documentation/devicetree/bindings/dma/stm32-dma.txt b/Documentation/devicetree/bindings/dma/stm32-dma.txt
> new file mode 100644
> index 0000000..70cd13f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/stm32-dma.txt
> @@ -0,0 +1,82 @@
> +* STMicroelectronics STM32 DMA controller
> +
> +The STM32 DMA is a general-purpose direct memory access controller capable of
> +supporting 8 independent DMA channels. Each channel can have up to 8 requests.
> +
> +Required properties:
> +- compatible: Should be "st,stm32-dma"
> +- reg: Should contain DMA registers location and length. This should include
> +  all of the per-channel registers.
> +- interrupts: Should contain all of the per-channel DMA interrupts in
> +  ascending order with respect to the DMA channel index.
> +- clocks: Should contain the input clock of the DMA instance.
> +- #dma-cells : Must be <4>. See DMA client paragraph for more details.
> +
> +Optional properties:
> +- resets: Reference to a reset controller asserting the DMA controller
> +- st,mem2mem: boolean; if defined, it indicates that the controller supports
> +  memory-to-memory transfer
> +
> +Example:
> +
> +       dma2: dma-controller at 40026400 {
> +               compatible = "st,stm32-dma";
> +               reg = <0x40026400 0x400>;
> +               interrupts = <56>,
> +                            <57>,
> +                            <58>,
> +                            <59>,
> +                            <60>,
> +                            <68>,
> +                            <69>,
> +                            <70>;
> +               clocks = <&clk_hclk>;
> +               #dma-cells = <4>;
> +               st,mem2mem;
> +               resets = <&rcc 150>;
> +       };
> +
> +* DMA client
> +
> +DMA clients connected to the STM32 DMA controller must use the format
> +described in the dma.txt file, using a five-cell specifier for each
> +channel: a phandle plus four integer cells.
> +The four cells in order are:
> +
> +1. The channel id
> +2. The request line number
> +3. A 32bit mask specifying the DMA channel configuration which are device
> +   dependent:
> +  -bit 9: Peripheral Increment Address
> +       0x0: no address increment between transfers
> +       0x1: increment address between transfers
> + -bit 10: Memory Increment Address
> +       0x0: no address increment between transfers
> +       0x1: increment address between transfers
> + -bit 15: Peripheral Increment Offset Size
> +       0x0: offset size is linked to the peripheral bus width
> +       0x1: offset size is fixed to 4 (32-bit alignment)
> + -bit 16-17: Priority level
> +       0x0: low
> +       0x1: medium
> +       0x2: high
> +       0x3: very high
> +5. A 32bit mask specifying the DMA FIFO threshold configuration which are device
> +   dependent:
> + -bit 0-1: Fifo threshold
> +       0x0: 1/4 full FIFO
> +       0x1: 1/2 full FIFO
> +       0x2: 3/4 full FIFO
> +       0x3: full FIFO
> +
> +Example:
> +
> +       usart1: serial at 40011000 {
> +               compatible = "st,stm32-usart", "st,stm32-uart";
> +               reg = <0x40011000 0x400>;
> +               interrupts = <37>;
> +               clocks = <&clk_pclk2>;
> +               dmas = <&dma2 2 4 0x10400 0x3>,
> +                      <&dma2 7 5 0x10200 0x3>;
> +               dma-names = "rx", "tx";
> +       };
> --
> 1.9.1
>

Re: [PATCH v4 0/4] Add support for STM32 DMA

[M'boumba Cedric Madianga]

 Hi Vinod,

Do you have any further comments or suggestions on this serie ?

BR,
Cedric

2015-10-16 15:59 GMT+02:00 M'boumba Cedric Madianga <cedric.madianga@gmail.com>:
> This patchset adds support for the STM32 DMA controller.
> This controller provides 8 channels dedicated to managing memory access
> request from one or more peripherals.
> Each stream can have up to 8 requests in total.
>
> Changes since v3:
>  - Fix regression introduced in v3 during request channel
>  - Fix regression introduced in v3 for cyclic mode dma transfer
>  - update interrupt description in DT
>  - remove half transfer interrupt management as client callback as to be
>    called only for complete transfer
>
> Changes since v2:
>  - remove interrupt configuration management from DT (Mark)
>  - remove FIFO configuration management from DT except threshold as it is very
>    hard to handle it in the driver due to many possible combinations according
>    to burst and bus width (Mark)
>  - update DMA client message in DT documentation file
>  - specify the order to be used to set per-channel DMA interrupts in the DT
>    (Mark)
>  - remove unused enumerations for channel and request ids (Daniel)
>  - keep as soon as possible 80 lines char for more readability (Vinod)
>  - replace unsigned int by u32 (Vinod)
>  - use GFP_NOWAIT instead of GFP_ATOMIC during dma descriptors allocation
>    (Vinod)
>  - return error if burst is not supported in stm32_dma_get_burst() (Vinod)
>  - return error if bus_width is not supported in stm32_dma_get_width() (Vinod)
>  - add FIFO configuration management inside the driver except for threshold
>  - add interrupt configuration management inside the driver (Mark)
>  - rework stm32_dma_chan_irq() to handle error interrupt in one way (Vinod)
>  - rework stm32_dma_set_xfer_param() to be easier to read
>  - update stm32_dma_tx_status() to always return status from dma_cookie_status() (Vinod)
>  - disable clk if we don't manage to stop the DMA channel during channel
>    resources allocation (Daniel)
>  - set driver as built-in as DMA will be required by other built-in driver
>
>  Changes since v1:
>   - remove dmamux boolean as it is not needed
>   - replace dma by DMA in Kconfig (Maxime)
>   - add default return value in stm32_dma_get_width()
>   - add defalut return value in stm32_dma_get_burst()
>   - use lower case for constant hexadecimal values (Maxime)
>
> M'boumba Cedric Madianga (4):
>   dt-bindings: Document the STM32 DMA bindings
>   dmaengine: Add STM32 DMA driver
>   ARM: dts: Add STM32 DMA support for STM32F429 MCU
>   ARM: configs: Add STM32 DMA support in STM32 defconfig
>
>  .../devicetree/bindings/dma/stm32-dma.txt          |   82 ++
>  arch/arm/boot/dts/stm32f429.dtsi                   |   31 +
>  arch/arm/configs/stm32_defconfig                   |    2 +
>  drivers/dma/Kconfig                                |   12 +
>  drivers/dma/Makefile                               |    1 +
>  drivers/dma/stm32-dma.c                            | 1141 ++++++++++++++++++++
>  6 files changed, 1269 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/dma/stm32-dma.txt
>  create mode 100644 drivers/dma/stm32-dma.c
>
> --
> 1.9.1
>

Re: [PATCH v4 0/4] Add support for STM32 DMA

[M'boumba Cedric Madianga]

 Hi Vinod,

Do you have any further comments or suggestions on this serie ?

BR,
Cedric

2015-10-16 15:59 GMT+02:00 M'boumba Cedric Madianga <cedric.madianga-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:
> This patchset adds support for the STM32 DMA controller.
> This controller provides 8 channels dedicated to managing memory access
> request from one or more peripherals.
> Each stream can have up to 8 requests in total.
>
> Changes since v3:
>  - Fix regression introduced in v3 during request channel
>  - Fix regression introduced in v3 for cyclic mode dma transfer
>  - update interrupt description in DT
>  - remove half transfer interrupt management as client callback as to be
>    called only for complete transfer
>
> Changes since v2:
>  - remove interrupt configuration management from DT (Mark)
>  - remove FIFO configuration management from DT except threshold as it is very
>    hard to handle it in the driver due to many possible combinations according
>    to burst and bus width (Mark)
>  - update DMA client message in DT documentation file
>  - specify the order to be used to set per-channel DMA interrupts in the DT
>    (Mark)
>  - remove unused enumerations for channel and request ids (Daniel)
>  - keep as soon as possible 80 lines char for more readability (Vinod)
>  - replace unsigned int by u32 (Vinod)
>  - use GFP_NOWAIT instead of GFP_ATOMIC during dma descriptors allocation
>    (Vinod)
>  - return error if burst is not supported in stm32_dma_get_burst() (Vinod)
>  - return error if bus_width is not supported in stm32_dma_get_width() (Vinod)
>  - add FIFO configuration management inside the driver except for threshold
>  - add interrupt configuration management inside the driver (Mark)
>  - rework stm32_dma_chan_irq() to handle error interrupt in one way (Vinod)
>  - rework stm32_dma_set_xfer_param() to be easier to read
>  - update stm32_dma_tx_status() to always return status from dma_cookie_status() (Vinod)
>  - disable clk if we don't manage to stop the DMA channel during channel
>    resources allocation (Daniel)
>  - set driver as built-in as DMA will be required by other built-in driver
>
>  Changes since v1:
>   - remove dmamux boolean as it is not needed
>   - replace dma by DMA in Kconfig (Maxime)
>   - add default return value in stm32_dma_get_width()
>   - add defalut return value in stm32_dma_get_burst()
>   - use lower case for constant hexadecimal values (Maxime)
>
> M'boumba Cedric Madianga (4):
>   dt-bindings: Document the STM32 DMA bindings
>   dmaengine: Add STM32 DMA driver
>   ARM: dts: Add STM32 DMA support for STM32F429 MCU
>   ARM: configs: Add STM32 DMA support in STM32 defconfig
>
>  .../devicetree/bindings/dma/stm32-dma.txt          |   82 ++
>  arch/arm/boot/dts/stm32f429.dtsi                   |   31 +
>  arch/arm/configs/stm32_defconfig                   |    2 +
>  drivers/dma/Kconfig                                |   12 +
>  drivers/dma/Makefile                               |    1 +
>  drivers/dma/stm32-dma.c                            | 1141 ++++++++++++++++++++
>  6 files changed, 1269 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/dma/stm32-dma.txt
>  create mode 100644 drivers/dma/stm32-dma.c
>
> --
> 1.9.1
>
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To unsubscribe from this list: send the line "unsubscribe devicetree" in
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[PATCH v4 0/4] Add support for STM32 DMA

[M'boumba Cedric Madianga]

 Hi Vinod,

Do you have any further comments or suggestions on this serie ?

BR,
Cedric

2015-10-16 15:59 GMT+02:00 M'boumba Cedric Madianga <cedric.madianga@gmail.com>:
> This patchset adds support for the STM32 DMA controller.
> This controller provides 8 channels dedicated to managing memory access
> request from one or more peripherals.
> Each stream can have up to 8 requests in total.
>
> Changes since v3:
>  - Fix regression introduced in v3 during request channel
>  - Fix regression introduced in v3 for cyclic mode dma transfer
>  - update interrupt description in DT
>  - remove half transfer interrupt management as client callback as to be
>    called only for complete transfer
>
> Changes since v2:
>  - remove interrupt configuration management from DT (Mark)
>  - remove FIFO configuration management from DT except threshold as it is very
>    hard to handle it in the driver due to many possible combinations according
>    to burst and bus width (Mark)
>  - update DMA client message in DT documentation file
>  - specify the order to be used to set per-channel DMA interrupts in the DT
>    (Mark)
>  - remove unused enumerations for channel and request ids (Daniel)
>  - keep as soon as possible 80 lines char for more readability (Vinod)
>  - replace unsigned int by u32 (Vinod)
>  - use GFP_NOWAIT instead of GFP_ATOMIC during dma descriptors allocation
>    (Vinod)
>  - return error if burst is not supported in stm32_dma_get_burst() (Vinod)
>  - return error if bus_width is not supported in stm32_dma_get_width() (Vinod)
>  - add FIFO configuration management inside the driver except for threshold
>  - add interrupt configuration management inside the driver (Mark)
>  - rework stm32_dma_chan_irq() to handle error interrupt in one way (Vinod)
>  - rework stm32_dma_set_xfer_param() to be easier to read
>  - update stm32_dma_tx_status() to always return status from dma_cookie_status() (Vinod)
>  - disable clk if we don't manage to stop the DMA channel during channel
>    resources allocation (Daniel)
>  - set driver as built-in as DMA will be required by other built-in driver
>
>  Changes since v1:
>   - remove dmamux boolean as it is not needed
>   - replace dma by DMA in Kconfig (Maxime)
>   - add default return value in stm32_dma_get_width()
>   - add defalut return value in stm32_dma_get_burst()
>   - use lower case for constant hexadecimal values (Maxime)
>
> M'boumba Cedric Madianga (4):
>   dt-bindings: Document the STM32 DMA bindings
>   dmaengine: Add STM32 DMA driver
>   ARM: dts: Add STM32 DMA support for STM32F429 MCU
>   ARM: configs: Add STM32 DMA support in STM32 defconfig
>
>  .../devicetree/bindings/dma/stm32-dma.txt          |   82 ++
>  arch/arm/boot/dts/stm32f429.dtsi                   |   31 +
>  arch/arm/configs/stm32_defconfig                   |    2 +
>  drivers/dma/Kconfig                                |   12 +
>  drivers/dma/Makefile                               |    1 +
>  drivers/dma/stm32-dma.c                            | 1141 ++++++++++++++++++++
>  6 files changed, 1269 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/dma/stm32-dma.txt
>  create mode 100644 drivers/dma/stm32-dma.c
>
> --
> 1.9.1
>

Re: [PATCH v4 1/4] dt-bindings: Document the STM32 DMA bindings

[Vinod Koul]

On Fri, Oct 16, 2015 at 03:59:13PM +0200, M'boumba Cedric Madianga wrote:
> This patch adds documentation of device tree bindings for the STM32 dma
> controller.
> 
Applied, thanks

-- 
~Vinod

[PATCH v4 1/4] dt-bindings: Document the STM32 DMA bindings

[Vinod Koul]

On Fri, Oct 16, 2015 at 03:59:13PM +0200, M'boumba Cedric Madianga wrote:
> This patch adds documentation of device tree bindings for the STM32 dma
> controller.
> 
Applied, thanks

-- 
~Vinod

Re: [PATCH v4 2/4] dmaengine: Add STM32 DMA driver

[Vinod Koul]

On Fri, Oct 16, 2015 at 03:59:14PM +0200, M'boumba Cedric Madianga wrote:
> This patch adds support for the STM32 DMA controller.
> 

Applied, thanks

-- 
~Vinod

[PATCH v4 2/4] dmaengine: Add STM32 DMA driver

[Vinod Koul]

On Fri, Oct 16, 2015 at 03:59:14PM +0200, M'boumba Cedric Madianga wrote:
> This patch adds support for the STM32 DMA controller.
> 

Applied, thanks

-- 
~Vinod

Re: [PATCH v4 3/4] ARM: dts: Add STM32 DMA support for STM32F429 MCU

[Vinod Koul]

On Fri, Oct 16, 2015 at 03:59:15PM +0200, M'boumba Cedric Madianga wrote:
> This patch adds STM32 DMA bindings for STM32F429.

I need an ACK from ARM folks on this one, and I suspect this might need
rebase on 4.4-rc1

> 
> Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
> ---
>  arch/arm/boot/dts/stm32f429.dtsi | 31 +++++++++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/stm32f429.dtsi b/arch/arm/boot/dts/stm32f429.dtsi
> index d78a481..037eb29 100644
> --- a/arch/arm/boot/dts/stm32f429.dtsi
> +++ b/arch/arm/boot/dts/stm32f429.dtsi
> @@ -174,6 +174,37 @@
>  			reg = <0x40023800 0x400>;
>  			clocks = <&clk_hse>;
>  		};
> +
> +		dma1: dma-controller@40026000 {
> +			compatible = "st,stm32-dma";
> +			reg = <0x40026000 0x400>;
> +			interrupts = <11>,
> +				     <12>,
> +				     <13>,
> +				     <14>,
> +				     <15>,
> +				     <16>,
> +				     <17>,
> +				     <47>;
> +			clocks = <&rcc 0 21>;
> +			#dma-cells = <4>;
> +		};
> +
> +		dma2: dma-controller@40026400 {
> +			compatible = "st,stm32-dma";
> +			reg = <0x40026400 0x400>;
> +			interrupts = <56>,
> +				     <57>,
> +				     <58>,
> +				     <59>,
> +				     <60>,
> +				     <68>,
> +				     <69>,
> +				     <70>;
> +			clocks = <&rcc 0 22>;
> +			#dma-cells = <4>;
> +			st,mem2mem;
> +		};
>  	};
>  };
>  
> -- 
> 1.9.1
> 

-- 
~Vinod

[PATCH v4 3/4] ARM: dts: Add STM32 DMA support for STM32F429 MCU

[Vinod Koul]

On Fri, Oct 16, 2015 at 03:59:15PM +0200, M'boumba Cedric Madianga wrote:
> This patch adds STM32 DMA bindings for STM32F429.

I need an ACK from ARM folks on this one, and I suspect this might need
rebase on 4.4-rc1

> 
> Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
> ---
>  arch/arm/boot/dts/stm32f429.dtsi | 31 +++++++++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/stm32f429.dtsi b/arch/arm/boot/dts/stm32f429.dtsi
> index d78a481..037eb29 100644
> --- a/arch/arm/boot/dts/stm32f429.dtsi
> +++ b/arch/arm/boot/dts/stm32f429.dtsi
> @@ -174,6 +174,37 @@
>  			reg = <0x40023800 0x400>;
>  			clocks = <&clk_hse>;
>  		};
> +
> +		dma1: dma-controller at 40026000 {
> +			compatible = "st,stm32-dma";
> +			reg = <0x40026000 0x400>;
> +			interrupts = <11>,
> +				     <12>,
> +				     <13>,
> +				     <14>,
> +				     <15>,
> +				     <16>,
> +				     <17>,
> +				     <47>;
> +			clocks = <&rcc 0 21>;
> +			#dma-cells = <4>;
> +		};
> +
> +		dma2: dma-controller at 40026400 {
> +			compatible = "st,stm32-dma";
> +			reg = <0x40026400 0x400>;
> +			interrupts = <56>,
> +				     <57>,
> +				     <58>,
> +				     <59>,
> +				     <60>,
> +				     <68>,
> +				     <69>,
> +				     <70>;
> +			clocks = <&rcc 0 22>;
> +			#dma-cells = <4>;
> +			st,mem2mem;
> +		};
>  	};
>  };
>  
> -- 
> 1.9.1
> 

-- 
~Vinod

Re: [PATCH v4 4/4] ARM: configs: Add STM32 DMA support in STM32 defconfig

[Vinod Koul]

On Fri, Oct 16, 2015 at 03:59:16PM +0200, M'boumba Cedric Madianga wrote:
> This patch adds STM32 DMA support in stm32_defconfig file

This seems okay, so went ahead and applied

-- 
~Vinod

Re: [PATCH v4 4/4] ARM: configs: Add STM32 DMA support in STM32 defconfig

[Vinod Koul]

On Fri, Oct 16, 2015 at 03:59:16PM +0200, M'boumba Cedric Madianga wrote:
> This patch adds STM32 DMA support in stm32_defconfig file

This seems okay, so went ahead and applied

-- 
~Vinod
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[PATCH v4 4/4] ARM: configs: Add STM32 DMA support in STM32 defconfig

[Vinod Koul]

On Fri, Oct 16, 2015 at 03:59:16PM +0200, M'boumba Cedric Madianga wrote:
> This patch adds STM32 DMA support in stm32_defconfig file

This seems okay, so went ahead and applied

-- 
~Vinod

Re: [PATCH v4 3/4] ARM: dts: Add STM32 DMA support for STM32F429 MCU

[M'boumba Cedric Madianga]

[-- Attachment #1: Type: text/plain, Size: 2474 bytes --]

Hi Vinod,

Le 16 nov. 2015 04:24, "Vinod Koul" <vinod.koul@intel.com> a écrit :
>
> On Fri, Oct 16, 2015 at 03:59:15PM +0200, M'boumba Cedric Madianga wrote:
> > This patch adds STM32 DMA bindings for STM32F429.
>
> I need an ACK from ARM folks on this one, and I suspect this might need
> rebase on 4.4-rc1

Maxime will take this patch and the other one about defconfig as he is the
maintainer of STM32 machine.

I think you don't need to take it into account..

BR,
Cedric
>
> >
> > Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
> > ---
> >  arch/arm/boot/dts/stm32f429.dtsi | 31 +++++++++++++++++++++++++++++++
> >  1 file changed, 31 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/stm32f429.dtsi
b/arch/arm/boot/dts/stm32f429.dtsi
> > index d78a481..037eb29 100644
> > --- a/arch/arm/boot/dts/stm32f429.dtsi
> > +++ b/arch/arm/boot/dts/stm32f429.dtsi
> > @@ -174,6 +174,37 @@
> >                       reg = <0x40023800 0x400>;
> >                       clocks = <&clk_hse>;
> >               };
> > +
> > +             dma1: dma-controller@40026000 {
> > +                     compatible = "st,stm32-dma";
> > +                     reg = <0x40026000 0x400>;
> > +                     interrupts = <11>,
> > +                                  <12>,
> > +                                  <13>,
> > +                                  <14>,
> > +                                  <15>,
> > +                                  <16>,
> > +                                  <17>,
> > +                                  <47>;
> > +                     clocks = <&rcc 0 21>;
> > +                     #dma-cells = <4>;
> > +             };
> > +
> > +             dma2: dma-controller@40026400 {
> > +                     compatible = "st,stm32-dma";
> > +                     reg = <0x40026400 0x400>;
> > +                     interrupts = <56>,
> > +                                  <57>,
> > +                                  <58>,
> > +                                  <59>,
> > +                                  <60>,
> > +                                  <68>,
> > +                                  <69>,
> > +                                  <70>;
> > +                     clocks = <&rcc 0 22>;
> > +                     #dma-cells = <4>;
> > +                     st,mem2mem;
> > +             };
> >       };
> >  };
> >
> > --
> > 1.9.1
> >
>
> --
> ~Vinod

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Re: [PATCH v4 3/4] ARM: dts: Add STM32 DMA support for STM32F429 MCU

[Maxime Coquelin]

2015-10-16 15:59 GMT+02:00 M'boumba Cedric Madianga <cedric.madianga@gmail.com>:
> This patch adds STM32 DMA bindings for STM32F429.
>
> Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
> ---
>  arch/arm/boot/dts/stm32f429.dtsi | 31 +++++++++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)

Applied to STM32 DT branch for v4.5.

Thanks!
Maxime

Re: [PATCH v4 3/4] ARM: dts: Add STM32 DMA support for STM32F429 MCU

[Maxime Coquelin]

2015-10-16 15:59 GMT+02:00 M'boumba Cedric Madianga <cedric.madianga-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:
> This patch adds STM32 DMA bindings for STM32F429.
>
> Signed-off-by: M'boumba Cedric Madianga <cedric.madianga-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> ---
>  arch/arm/boot/dts/stm32f429.dtsi | 31 +++++++++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)

Applied to STM32 DT branch for v4.5.

Thanks!
Maxime
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[PATCH v4 3/4] ARM: dts: Add STM32 DMA support for STM32F429 MCU

[Maxime Coquelin]

2015-10-16 15:59 GMT+02:00 M'boumba Cedric Madianga <cedric.madianga@gmail.com>:
> This patch adds STM32 DMA bindings for STM32F429.
>
> Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
> ---
>  arch/arm/boot/dts/stm32f429.dtsi | 31 +++++++++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)

Applied to STM32 DT branch for v4.5.

Thanks!
Maxime