[PATCH v2 00/12] ARM: mxs: move to generic DMA device tree binding

[PATCH v2 00/12] ARM: mxs: move to generic DMA device tree binding

[Shawn Guo]

The series converts mxs-dma and its clients to generic DMA device tree
binding/helper.

I published a branch below to ease people who is willing to help
testing the series.

 git://git.linaro.org/people/shawnguo/linux-2.6.git devel/mxs-dma-dt

Changes since v1:
 - Remove the use of of_dma_filter_info which should not be needed by
   a customized xlate function
 - Correct dma-names to have it mean the channel function in client
   devices
 - Add a new dmaengine_pcm API snd_dmaengine_generic_pcm_open() for
   users that support generic DMA device tree binding
 - Remove the old fsl,<module>-dma-channel properties from device tree

Subsystem maintainers,

I need your ACKs to have the series go via arm-soc as a whole if the
patches look good to you.

Thanks,
Shawn

Shawn Guo (12):
  ARM: dts: add generic DMA device tree binding for mxs-dma
  dma: mxs-dma: use devm_* managed functions
  dma: mxs-dma: move to generic device tree binding
  mmc: mxs-mmc: move to use generic DMA helper
  spi: mxs-spi: move to use generic DMA helper
  i2c: i2c-mxs: move to use generic DMA helper
  mtd: gpmi: move to use generic DMA helper
  serial: mxs-auart: move to use generic DMA helper
  ASoC: dmaengine_pcm: add snd_dmaengine_generic_pcm_open()
  ASoC: mxs: move to use generic DMA helper
  dma: mxs-dma: remove code left from generic DMA binding conversion
  ARM: dts: remove old DMA binding data from client nodes

 .../devicetree/bindings/dma/fsl-mxs-dma.txt        |   49 +++++++-
 Documentation/devicetree/bindings/i2c/i2c-mxs.txt  |   12 +-
 Documentation/devicetree/bindings/mmc/mxs-mmc.txt  |   12 +-
 .../devicetree/bindings/mtd/gpmi-nand.txt          |   17 +--
 .../devicetree/bindings/sound/mxs-saif.txt         |   18 +--
 Documentation/devicetree/bindings/spi/mxs-spi.txt  |   12 +-
 .../bindings/tty/serial/fsl-mxs-auart.txt          |   16 ++-
 arch/arm/boot/dts/imx23.dtsi                       |   57 +++++++--
 arch/arm/boot/dts/imx28.dtsi                       |  104 +++++++++++-----
 arch/arm/boot/dts/imx6qdl.dtsi                     |   12 +-
 drivers/dma/mxs-dma.c                              |  128 +++++++++++---------
 drivers/i2c/busses/i2c-mxs.c                       |   40 +-----
 drivers/mmc/host/mxs-mmc.c                         |   48 +-------
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c             |   51 +-------
 drivers/mtd/nand/gpmi-nand/gpmi-nand.h             |    3 +-
 drivers/spi/spi-mxs.c                              |   60 ++-------
 drivers/tty/serial/mxs-auart.c                     |   52 +-------
 include/linux/fsl/mxs-dma.h                        |   20 ---
 include/linux/spi/mxs-spi.h                        |    4 +-
 include/sound/dmaengine_pcm.h                      |    2 +
 sound/soc/mxs/mxs-pcm.c                            |   42 +------
 sound/soc/mxs/mxs-pcm.h                            |    5 -
 sound/soc/mxs/mxs-saif.c                           |   28 +----
 sound/soc/mxs/mxs-saif.h                           |    1 -
 sound/soc/soc-dmaengine-pcm.c                      |   39 ++++++
 25 files changed, 368 insertions(+), 464 deletions(-)
 delete mode 100644 include/linux/fsl/mxs-dma.h

-- 
1.7.9.5

[PATCH v2 01/12] ARM: dts: add generic DMA device tree binding for mxs-dma

[Shawn Guo]

Add generic DMA device tree binding for mxs-dma.  The changes include:

 * Add channel interrupts into DMA controller nodes
 * Add properties '#dma-cells' and 'dma-channels' for DMA controller nodes
 * And properties 'dmas' and 'dma-names' for DMA client nodes
 * Update mxs-dma device tree binding doc

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
---
 .../devicetree/bindings/dma/fsl-mxs-dma.txt        |   49 +++++++++++++++--
 arch/arm/boot/dts/imx23.dtsi                       |   42 +++++++++++++-
 arch/arm/boot/dts/imx28.dtsi                       |   58 +++++++++++++++++++-
 arch/arm/boot/dts/imx6qdl.dtsi                     |    8 ++-
 4 files changed, 148 insertions(+), 9 deletions(-)

diff --git a/Documentation/devicetree/bindings/dma/fsl-mxs-dma.txt b/Documentation/devicetree/bindings/dma/fsl-mxs-dma.txt
index ded0398..a4873e5 100644
--- a/Documentation/devicetree/bindings/dma/fsl-mxs-dma.txt
+++ b/Documentation/devicetree/bindings/dma/fsl-mxs-dma.txt
@@ -3,17 +3,58 @@
 Required properties:
 - compatible : Should be "fsl,<chip>-dma-apbh" or "fsl,<chip>-dma-apbx"
 - reg : Should contain registers location and length
+- interrupts : Should contain the interrupt numbers of DMA channels.
+  If a channel is empty/reserved, 0 should be filled in place.
+- #dma-cells : Must be <1>.  The number cell specifies the channel ID.
+- dma-channels : Number of channels supported by the DMA controller
+
+Optional properties:
+- interrupt-names : Name of DMA channel interrupts
 
 Supported chips:
 imx23, imx28.
 
 Examples:
-dma-apbh at 80004000 {
+
+dma_apbh: dma-apbh at 80004000 {
 	compatible = "fsl,imx28-dma-apbh";
-	reg = <0x80004000 2000>;
+	reg = <0x80004000 0x2000>;
+	interrupts = <82 83 84 85
+		      88 88 88 88
+		      88 88 88 88
+		      87 86 0 0>;
+	interrupt-names = "ssp0", "ssp1", "ssp2", "ssp3",
+			  "gpmi0", "gmpi1", "gpmi2", "gmpi3",
+			  "gpmi4", "gmpi5", "gpmi6", "gmpi7",
+			  "hsadc", "lcdif", "empty", "empty";
+	#dma-cells = <1>;
+	dma-channels = <16>;
 };
 
-dma-apbx at 80024000 {
+dma_apbx: dma-apbx at 80024000 {
 	compatible = "fsl,imx28-dma-apbx";
-	reg = <0x80024000 2000>;
+	reg = <0x80024000 0x2000>;
+	interrupts = <78 79 66 0
+		      80 81 68 69
+		      70 71 72 73
+		      74 75 76 77>;
+	interrupt-names = "auart4-rx", "aurat4-tx", "spdif-tx", "empty",
+			  "saif0", "saif1", "i2c0", "i2c1",
+			  "auart0-rx", "auart0-tx", "auart1-rx", "auart1-tx",
+			  "auart2-rx", "auart2-tx", "auart3-rx", "auart3-tx";
+	#dma-cells = <1>;
+	dma-channels = <16>;
+};
+
+DMA clients connected to the MXS DMA controller must use the format
+described in the dma.txt file.
+
+Examples:
+
+auart0: serial at 8006a000 {
+	compatible = "fsl,imx28-auart", "fsl,imx23-auart";
+	reg = <0x8006a000 0x2000>;
+	interrupts = <112>;
+	dmas = <&dma_apbx 8>, <&dma_apbx 9>;
+	dma-names = "rx", "tx";
 };
diff --git a/arch/arm/boot/dts/imx23.dtsi b/arch/arm/boot/dts/imx23.dtsi
index 56afcf4..64f901f 100644
--- a/arch/arm/boot/dts/imx23.dtsi
+++ b/arch/arm/boot/dts/imx23.dtsi
@@ -49,9 +49,15 @@
 				reg = <0x80000000 0x2000>;
 			};
 
-			dma-apbh at 80004000 {
+			dma_apbh: dma-apbh at 80004000 {
 				compatible = "fsl,imx23-dma-apbh";
 				reg = <0x80004000 0x2000>;
+				interrupts = <0 14 20 0
+					      13 13 13 13>;
+				interrupt-names = "empty", "ssp0", "ssp1", "empty",
+						  "gpmi0", "gpmi1", "gpmi2", "gpmi3";
+				#dma-cells = <1>;
+				dma-channels = <8>;
 				clocks = <&clks 15>;
 			};
 
@@ -70,6 +76,8 @@
 				interrupt-names = "gpmi-dma", "bch";
 				clocks = <&clks 34>;
 				clock-names = "gpmi_io";
+				dmas = <&dma_apbh 4>;
+				dma-names = "rx-tx";
 				fsl,gpmi-dma-channel = <4>;
 				status = "disabled";
 			};
@@ -78,6 +86,8 @@
 				reg = <0x80010000 0x2000>;
 				interrupts = <15 14>;
 				clocks = <&clks 33>;
+				dmas = <&dma_apbh 1>;
+				dma-names = "rx-tx";
 				fsl,ssp-dma-channel = <1>;
 				status = "disabled";
 			};
@@ -304,9 +314,19 @@
 				status = "disabled";
 			};
 
-			dma-apbx at 80024000 {
+			dma_apbx: dma-apbx at 80024000 {
 				compatible = "fsl,imx23-dma-apbx";
 				reg = <0x80024000 0x2000>;
+				interrupts = <7 5 9 26
+					      19 0 25 23
+					      60 58 9 0
+					      0 0 0 0>;
+				interrupt-names = "audio-adc", "audio-dac", "spdif-tx", "i2c",
+						  "saif0", "empty", "auart0-rx", "auart0-tx",
+						  "auart1-rx", "auart1-tx", "saif1", "empty",
+						  "empty", "empty", "empty", "empty";
+				#dma-cells = <1>;
+				dma-channels = <16>;
 				clocks = <&clks 16>;
 			};
 
@@ -342,6 +362,8 @@
 				reg = <0x80034000 0x2000>;
 				interrupts = <2 20>;
 				clocks = <&clks 33>;
+				dmas = <&dma_apbh 2>;
+				dma-names = "rx-tx";
 				fsl,ssp-dma-channel = <2>;
 				status = "disabled";
 			};
@@ -367,6 +389,8 @@
 
 			saif0: saif at 80042000 {
 				reg = <0x80042000 0x2000>;
+				dmas = <&dma_apbx 4>;
+				dma-names = "rx-tx";
 				status = "disabled";
 			};
 
@@ -377,16 +401,22 @@
 
 			saif1: saif at 80046000 {
 				reg = <0x80046000 0x2000>;
+				dmas = <&dma_apbx 10>;
+				dma-names = "rx-tx";
 				status = "disabled";
 			};
 
 			audio-out at 80048000 {
 				reg = <0x80048000 0x2000>;
+				dmas = <&dma_apbx 1>;
+				dma-names = "tx";
 				status = "disabled";
 			};
 
 			audio-in at 8004c000 {
 				reg = <0x8004c000 0x2000>;
+				dmas = <&dma_apbx 0>;
+				dma-names = "rx";
 				status = "disabled";
 			};
 
@@ -399,11 +429,15 @@
 
 			spdif at 80054000 {
 				reg = <0x80054000 2000>;
+				dmas = <&dma_apbx 2>;
+				dma-names = "tx";
 				status = "disabled";
 			};
 
 			i2c at 80058000 {
 				reg = <0x80058000 0x2000>;
+				dmas = <&dma_apbx 3>;
+				dma-names = "rx-tx";
 				status = "disabled";
 			};
 
@@ -433,6 +467,8 @@
 				reg = <0x8006c000 0x2000>;
 				interrupts = <24 25 23>;
 				clocks = <&clks 32>;
+				dmas = <&dma_apbx 6>, <&dma_apbx 7>;
+				dma-names = "rx", "tx";
 				status = "disabled";
 			};
 
@@ -441,6 +477,8 @@
 				reg = <0x8006e000 0x2000>;
 				interrupts = <59 60 58>;
 				clocks = <&clks 32>;
+				dmas = <&dma_apbx 8>, <&dma_apbx 9>;
+				dma-names = "rx", "tx";
 				status = "disabled";
 			};
 
diff --git a/arch/arm/boot/dts/imx28.dtsi b/arch/arm/boot/dts/imx28.dtsi
index 7ba4966..3b87088 100644
--- a/arch/arm/boot/dts/imx28.dtsi
+++ b/arch/arm/boot/dts/imx28.dtsi
@@ -61,12 +61,24 @@
 			hsadc at 80002000 {
 				reg = <0x80002000 0x2000>;
 				interrupts = <13 87>;
+				dmas = <&dma_apbh 12>;
+				dma-names = "rx";
 				status = "disabled";
 			};
 
-			dma-apbh at 80004000 {
+			dma_apbh: dma-apbh at 80004000 {
 				compatible = "fsl,imx28-dma-apbh";
 				reg = <0x80004000 0x2000>;
+				interrupts = <82 83 84 85
+					      88 88 88 88
+					      88 88 88 88
+					      87 86 0 0>;
+				interrupt-names = "ssp0", "ssp1", "ssp2", "ssp3",
+						  "gpmi0", "gmpi1", "gpmi2", "gmpi3",
+						  "gpmi4", "gmpi5", "gpmi6", "gmpi7",
+						  "hsadc", "lcdif", "empty", "empty";
+				#dma-cells = <1>;
+				dma-channels = <16>;
 				clocks = <&clks 25>;
 			};
 
@@ -86,6 +98,8 @@
 				interrupt-names = "gpmi-dma", "bch";
 				clocks = <&clks 50>;
 				clock-names = "gpmi_io";
+				dmas = <&dma_apbh 4>;
+				dma-names = "rx-tx";
 				fsl,gpmi-dma-channel = <4>;
 				status = "disabled";
 			};
@@ -96,6 +110,8 @@
 				reg = <0x80010000 0x2000>;
 				interrupts = <96 82>;
 				clocks = <&clks 46>;
+				dmas = <&dma_apbh 0>;
+				dma-names = "rx-tx";
 				fsl,ssp-dma-channel = <0>;
 				status = "disabled";
 			};
@@ -106,6 +122,8 @@
 				reg = <0x80012000 0x2000>;
 				interrupts = <97 83>;
 				clocks = <&clks 47>;
+				dmas = <&dma_apbh 1>;
+				dma-names = "rx-tx";
 				fsl,ssp-dma-channel = <1>;
 				status = "disabled";
 			};
@@ -116,6 +134,8 @@
 				reg = <0x80014000 0x2000>;
 				interrupts = <98 84>;
 				clocks = <&clks 48>;
+				dmas = <&dma_apbh 2>;
+				dma-names = "rx-tx";
 				fsl,ssp-dma-channel = <2>;
 				status = "disabled";
 			};
@@ -126,6 +146,8 @@
 				reg = <0x80016000 0x2000>;
 				interrupts = <99 85>;
 				clocks = <&clks 49>;
+				dmas = <&dma_apbh 3>;
+				dma-names = "rx-tx";
 				fsl,ssp-dma-channel = <3>;
 				status = "disabled";
 			};
@@ -657,9 +679,19 @@
 				status = "disabled";
 			};
 
-			dma-apbx at 80024000 {
+			dma_apbx: dma-apbx at 80024000 {
 				compatible = "fsl,imx28-dma-apbx";
 				reg = <0x80024000 0x2000>;
+				interrupts = <78 79 66 0
+					      80 81 68 69
+					      70 71 72 73
+					      74 75 76 77>;
+				interrupt-names = "auart4-rx", "aurat4-tx", "spdif-tx", "empty",
+						  "saif0", "saif1", "i2c0", "i2c1",
+						  "auart0-rx", "auart0-tx", "auart1-rx", "auart1-tx",
+						  "auart2-rx", "auart2-tx", "auart3-rx", "auart3-tx";
+				#dma-cells = <1>;
+				dma-channels = <16>;
 				clocks = <&clks 26>;
 			};
 
@@ -690,6 +722,8 @@
 				reg = <0x80030000 0x2000>;
 				interrupts = <38 86>;
 				clocks = <&clks 55>;
+				dmas = <&dma_apbh 13>;
+				dma-names = "rx";
 				status = "disabled";
 			};
 
@@ -765,6 +799,8 @@
 				reg = <0x80042000 0x2000>;
 				interrupts = <59 80>;
 				clocks = <&clks 53>;
+				dmas = <&dma_apbx 4>;
+				dma-names = "rx-tx";
 				fsl,saif-dma-channel = <4>;
 				status = "disabled";
 			};
@@ -779,6 +815,8 @@
 				reg = <0x80046000 0x2000>;
 				interrupts = <58 81>;
 				clocks = <&clks 54>;
+				dmas = <&dma_apbx 5>;
+				dma-names = "rx-tx";
 				fsl,saif-dma-channel = <5>;
 				status = "disabled";
 			};
@@ -794,6 +832,8 @@
 			spdif at 80054000 {
 				reg = <0x80054000 0x2000>;
 				interrupts = <45 66>;
+				dmas = <&dma_apbx 2>;
+				dma-names = "tx";
 				status = "disabled";
 			};
 
@@ -810,6 +850,8 @@
 				reg = <0x80058000 0x2000>;
 				interrupts = <111 68>;
 				clock-frequency = <100000>;
+				dmas = <&dma_apbx 6>;
+				dma-names = "rx-tx";
 				fsl,i2c-dma-channel = <6>;
 				status = "disabled";
 			};
@@ -821,6 +863,8 @@
 				reg = <0x8005a000 0x2000>;
 				interrupts = <110 69>;
 				clock-frequency = <100000>;
+				dmas = <&dma_apbx 7>;
+				dma-names = "rx-tx";
 				fsl,i2c-dma-channel = <7>;
 				status = "disabled";
 			};
@@ -844,6 +888,8 @@
 				compatible = "fsl,imx28-auart", "fsl,imx23-auart";
 				reg = <0x8006a000 0x2000>;
 				interrupts = <112 70 71>;
+				dmas = <&dma_apbx 8>, <&dma_apbx 9>;
+				dma-names = "rx", "tx";
 				fsl,auart-dma-channel = <8 9>;
 				clocks = <&clks 45>;
 				status = "disabled";
@@ -853,6 +899,8 @@
 				compatible = "fsl,imx28-auart", "fsl,imx23-auart";
 				reg = <0x8006c000 0x2000>;
 				interrupts = <113 72 73>;
+				dmas = <&dma_apbx 10>, <&dma_apbx 11>;
+				dma-names = "rx", "tx";
 				clocks = <&clks 45>;
 				status = "disabled";
 			};
@@ -861,6 +909,8 @@
 				compatible = "fsl,imx28-auart", "fsl,imx23-auart";
 				reg = <0x8006e000 0x2000>;
 				interrupts = <114 74 75>;
+				dmas = <&dma_apbx 12>, <&dma_apbx 13>;
+				dma-names = "rx", "tx";
 				clocks = <&clks 45>;
 				status = "disabled";
 			};
@@ -869,6 +919,8 @@
 				compatible = "fsl,imx28-auart", "fsl,imx23-auart";
 				reg = <0x80070000 0x2000>;
 				interrupts = <115 76 77>;
+				dmas = <&dma_apbx 14>, <&dma_apbx 15>;
+				dma-names = "rx", "tx";
 				clocks = <&clks 45>;
 				status = "disabled";
 			};
@@ -877,6 +929,8 @@
 				compatible = "fsl,imx28-auart", "fsl,imx23-auart";
 				reg = <0x80072000 0x2000>;
 				interrupts = <116 78 79>;
+				dmas = <&dma_apbx 0>, <&dma_apbx 1>;
+				dma-names = "rx", "tx";
 				clocks = <&clks 45>;
 				status = "disabled";
 			};
diff --git a/arch/arm/boot/dts/imx6qdl.dtsi b/arch/arm/boot/dts/imx6qdl.dtsi
index 06ec460..e6b8781 100644
--- a/arch/arm/boot/dts/imx6qdl.dtsi
+++ b/arch/arm/boot/dts/imx6qdl.dtsi
@@ -65,9 +65,13 @@
 		interrupt-parent = <&intc>;
 		ranges;
 
-		dma-apbh at 00110000 {
+		dma_apbh: dma-apbh at 00110000 {
 			compatible = "fsl,imx6q-dma-apbh", "fsl,imx28-dma-apbh";
 			reg = <0x00110000 0x2000>;
+			interrupts = <0 13 0x04>, <0 13 0x04>, <0 13 0x04>, <0 13 0x04>;
+			interrupt-names = "gpmi0", "gpmi1", "gpmi2", "gpmi3";
+			#dma-cells = <1>;
+			dma-channels = <4>;
 			clocks = <&clks 106>;
 		};
 
@@ -83,6 +87,8 @@
 				 <&clks 150>, <&clks 149>;
 			clock-names = "gpmi_io", "gpmi_apb", "gpmi_bch",
 				      "gpmi_bch_apb", "per1_bch";
+			dmas = <&dma_apbh 0>;
+			dma-names = "gpmi";
 			fsl,gpmi-dma-channel = <0>;
 			status = "disabled";
 		};
-- 
1.7.9.5

[PATCH v2 02/12] dma: mxs-dma: use devm_* managed functions

[Shawn Guo]

Use devm_* managed functions to simplify probe() error handling.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
---
 drivers/dma/mxs-dma.c |   39 +++++++++------------------------------
 1 file changed, 9 insertions(+), 30 deletions(-)

diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c
index 8f6d30d..bb86f7f 100644
--- a/drivers/dma/mxs-dma.c
+++ b/drivers/dma/mxs-dma.c
@@ -674,7 +674,7 @@ static int __init mxs_dma_probe(struct platform_device *pdev)
 	struct resource *iores;
 	int ret, i;
 
-	mxs_dma = kzalloc(sizeof(*mxs_dma), GFP_KERNEL);
+	mxs_dma = devm_kzalloc(&pdev->dev, sizeof(*mxs_dma), GFP_KERNEL);
 	if (!mxs_dma)
 		return -ENOMEM;
 
@@ -689,24 +689,13 @@ static int __init mxs_dma_probe(struct platform_device *pdev)
 	mxs_dma->dev_id = dma_type->id;
 
 	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mxs_dma->base = devm_ioremap_resource(&pdev->dev, iores);
+	if (IS_ERR(mxs_dma->base))
+		return PTR_ERR(mxs_dma->base);
 
-	if (!request_mem_region(iores->start, resource_size(iores),
-				pdev->name)) {
-		ret = -EBUSY;
-		goto err_request_region;
-	}
-
-	mxs_dma->base = ioremap(iores->start, resource_size(iores));
-	if (!mxs_dma->base) {
-		ret = -ENOMEM;
-		goto err_ioremap;
-	}
-
-	mxs_dma->clk = clk_get(&pdev->dev, NULL);
-	if (IS_ERR(mxs_dma->clk)) {
-		ret = PTR_ERR(mxs_dma->clk);
-		goto err_clk;
-	}
+	mxs_dma->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(mxs_dma->clk))
+		return PTR_ERR(mxs_dma->clk);
 
 	dma_cap_set(DMA_SLAVE, mxs_dma->dma_device.cap_mask);
 	dma_cap_set(DMA_CYCLIC, mxs_dma->dma_device.cap_mask);
@@ -732,7 +721,7 @@ static int __init mxs_dma_probe(struct platform_device *pdev)
 
 	ret = mxs_dma_init(mxs_dma);
 	if (ret)
-		goto err_init;
+		return ret;
 
 	mxs_dma->dma_device.dev = &pdev->dev;
 
@@ -751,22 +740,12 @@ static int __init mxs_dma_probe(struct platform_device *pdev)
 	ret = dma_async_device_register(&mxs_dma->dma_device);
 	if (ret) {
 		dev_err(mxs_dma->dma_device.dev, "unable to register\n");
-		goto err_init;
+		return ret;
 	}
 
 	dev_info(mxs_dma->dma_device.dev, "initialized\n");
 
 	return 0;
-
-err_init:
-	clk_put(mxs_dma->clk);
-err_clk:
-	iounmap(mxs_dma->base);
-err_ioremap:
-	release_mem_region(iores->start, resource_size(iores));
-err_request_region:
-	kfree(mxs_dma);
-	return ret;
 }
 
 static struct platform_driver mxs_dma_driver = {
-- 
1.7.9.5

[PATCH v2 03/12] dma: mxs-dma: move to generic device tree binding

[Shawn Guo]

Update mxs-dma driver to adopt generic DMA device tree binding.  It
calls of_dma_controller_register() with mxs specific of_dma_xlate to
get the generic DMA device tree helper support.  Then DMA clients only
need to call dma_request_slave_channel() for requesting a DMA channel
from dmaengine.

The existing way of requesting channel, clients directly call
dma_request_channel(), still work there, and will be removed after
all mxs-dma clients get converted to generic DMA device tree helper.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
---
 drivers/dma/mxs-dma.c |   70 ++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 66 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c
index bb86f7f..b48a79c 100644
--- a/drivers/dma/mxs-dma.c
+++ b/drivers/dma/mxs-dma.c
@@ -27,6 +27,7 @@
 #include <linux/stmp_device.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/of_dma.h>
 
 #include <asm/irq.h>
 
@@ -139,6 +140,8 @@ struct mxs_dma_engine {
 	struct dma_device		dma_device;
 	struct device_dma_parameters	dma_parms;
 	struct mxs_dma_chan		mxs_chans[MXS_DMA_CHANNELS];
+	struct platform_device		*pdev;
+	unsigned int			nr_channels;
 };
 
 struct mxs_dma_type {
@@ -350,10 +353,8 @@ static int mxs_dma_alloc_chan_resources(struct dma_chan *chan)
 	struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
 	int ret;
 
-	if (!data)
-		return -EINVAL;
-
-	mxs_chan->chan_irq = data->chan_irq;
+	if (data)
+		mxs_chan->chan_irq = data->chan_irq;
 
 	mxs_chan->ccw = dma_alloc_coherent(mxs_dma->dma_device.dev,
 				CCW_BLOCK_SIZE, &mxs_chan->ccw_phys,
@@ -665,8 +666,55 @@ err_out:
 	return ret;
 }
 
+struct mxs_dma_filter_param {
+	struct device_node *of_node;
+	unsigned int chan_id;
+};
+
+static bool mxs_dma_filter_fn(struct dma_chan *chan, void *fn_param)
+{
+	struct mxs_dma_filter_param *param = fn_param;
+	struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan);
+	struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
+	int chan_irq;
+
+	if (mxs_dma->dma_device.dev->of_node != param->of_node)
+		return false;
+
+	if (chan->chan_id != param->chan_id)
+		return false;
+
+	chan_irq = platform_get_irq(mxs_dma->pdev, param->chan_id);
+	if (chan_irq < 0)
+		return false;
+
+	mxs_chan->chan_irq = chan_irq;
+
+	return true;
+}
+
+struct dma_chan *mxs_dma_xlate(struct of_phandle_args *dma_spec,
+			       struct of_dma *ofdma)
+{
+	struct mxs_dma_engine *mxs_dma = ofdma->of_dma_data;
+	dma_cap_mask_t mask = mxs_dma->dma_device.cap_mask;
+	struct mxs_dma_filter_param param;
+
+	if (dma_spec->args_count != 1)
+		return NULL;
+
+	param.of_node = ofdma->of_node;
+	param.chan_id = dma_spec->args[0];
+
+	if (param.chan_id >= mxs_dma->nr_channels)
+		return NULL;
+
+	return dma_request_channel(mask, mxs_dma_filter_fn, &param);
+}
+
 static int __init mxs_dma_probe(struct platform_device *pdev)
 {
+	struct device_node *np = pdev->dev.of_node;
 	const struct platform_device_id *id_entry;
 	const struct of_device_id *of_id;
 	const struct mxs_dma_type *dma_type;
@@ -678,6 +726,12 @@ static int __init mxs_dma_probe(struct platform_device *pdev)
 	if (!mxs_dma)
 		return -ENOMEM;
 
+	ret = of_property_read_u32(np, "dma-channels", &mxs_dma->nr_channels);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to read dma-channels\n");
+		return ret;
+	}
+
 	of_id = of_match_device(mxs_dma_dt_ids, &pdev->dev);
 	if (of_id)
 		id_entry = of_id->data;
@@ -723,6 +777,7 @@ static int __init mxs_dma_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	mxs_dma->pdev = pdev;
 	mxs_dma->dma_device.dev = &pdev->dev;
 
 	/* mxs_dma gets 65535 bytes maximum sg size */
@@ -743,6 +798,13 @@ static int __init mxs_dma_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	ret = of_dma_controller_register(np, mxs_dma_xlate, mxs_dma);
+	if (ret) {
+		dev_err(mxs_dma->dma_device.dev,
+			"failed to register controller\n");
+		dma_async_device_unregister(&mxs_dma->dma_device);
+	}
+
 	dev_info(mxs_dma->dma_device.dev, "initialized\n");
 
 	return 0;
-- 
1.7.9.5

[PATCH v2 04/12] mmc: mxs-mmc: move to use generic DMA helper

[Shawn Guo]

With the generic DMA device tree helper supported by mxs-dma driver,
client devices only need to call dma_request_slave_channel() for
requesting a DMA channel from dmaengine.

Since mxs is a DT only platform now, along with the changes, the non-DT
case checking in probe function also gets cleaned up.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Chris Ball <cjb@laptop.org>
Cc: linux-mmc at vger.kernel.org
---
 Documentation/devicetree/bindings/mmc/mxs-mmc.txt |   12 ++++--
 drivers/mmc/host/mxs-mmc.c                        |   48 +++------------------
 2 files changed, 13 insertions(+), 47 deletions(-)

diff --git a/Documentation/devicetree/bindings/mmc/mxs-mmc.txt b/Documentation/devicetree/bindings/mmc/mxs-mmc.txt
index 54949f6..515addc 100644
--- a/Documentation/devicetree/bindings/mmc/mxs-mmc.txt
+++ b/Documentation/devicetree/bindings/mmc/mxs-mmc.txt
@@ -9,15 +9,19 @@ and the properties used by the mxsmmc driver.
 Required properties:
 - compatible: Should be "fsl,<chip>-mmc".  The supported chips include
   imx23 and imx28.
-- interrupts: Should contain ERROR and DMA interrupts
-- fsl,ssp-dma-channel: APBH DMA channel for the SSP
+- interrupts: Should contain ERROR interrupt number
+- dmas: DMA specifier, consisting of a phandle to DMA controller node
+  and SSP DMA channel ID.
+  Refer to dma.txt and fsl-mxs-dma.txt for details.
+- dma-names: Must be "rx-tx".
 
 Examples:
 
 ssp0: ssp at 80010000 {
 	compatible = "fsl,imx28-mmc";
 	reg = <0x80010000 2000>;
-	interrupts = <96 82>;
-	fsl,ssp-dma-channel = <0>;
+	interrupts = <96>;
+	dmas = <&dma_apbh 0>;
+	dma-names = "rx-tx";
 	bus-width = <8>;
 };
diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index 4efe302..4fdc711 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -548,22 +548,6 @@ static const struct mmc_host_ops mxs_mmc_ops = {
 	.enable_sdio_irq = mxs_mmc_enable_sdio_irq,
 };
 
-static bool mxs_mmc_dma_filter(struct dma_chan *chan, void *param)
-{
-	struct mxs_mmc_host *host = param;
-	struct mxs_ssp *ssp = &host->ssp;
-
-	if (!mxs_dma_is_apbh(chan))
-		return false;
-
-	if (chan->chan_id != ssp->dma_channel)
-		return false;
-
-	chan->private = &ssp->dma_data;
-
-	return true;
-}
-
 static struct platform_device_id mxs_ssp_ids[] = {
 	{
 		.name = "imx23-mmc",
@@ -591,20 +575,17 @@ static int mxs_mmc_probe(struct platform_device *pdev)
 	struct device_node *np = pdev->dev.of_node;
 	struct mxs_mmc_host *host;
 	struct mmc_host *mmc;
-	struct resource *iores, *dmares;
+	struct resource *iores;
 	struct pinctrl *pinctrl;
-	int ret = 0, irq_err, irq_dma;
-	dma_cap_mask_t mask;
+	int ret = 0, irq_err;
 	struct regulator *reg_vmmc;
 	enum of_gpio_flags flags;
 	struct mxs_ssp *ssp;
 	u32 bus_width = 0;
 
 	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 	irq_err = platform_get_irq(pdev, 0);
-	irq_dma = platform_get_irq(pdev, 1);
-	if (!iores || irq_err < 0 || irq_dma < 0)
+	if (!iores || irq_err < 0)
 		return -EINVAL;
 
 	mmc = mmc_alloc_host(sizeof(struct mxs_mmc_host), &pdev->dev);
@@ -620,23 +601,7 @@ static int mxs_mmc_probe(struct platform_device *pdev)
 		goto out_mmc_free;
 	}
 
-	if (np) {
-		ssp->devid = (enum mxs_ssp_id) of_id->data;
-		/*
-		 * TODO: This is a temporary solution and should be changed
-		 * to use generic DMA binding later when the helpers get in.
-		 */
-		ret = of_property_read_u32(np, "fsl,ssp-dma-channel",
-					   &ssp->dma_channel);
-		if (ret) {
-			dev_err(mmc_dev(host->mmc),
-				"failed to get dma channel\n");
-			goto out_mmc_free;
-		}
-	} else {
-		ssp->devid = pdev->id_entry->driver_data;
-		ssp->dma_channel = dmares->start;
-	}
+	ssp->devid = (enum mxs_ssp_id) of_id->data;
 
 	host->mmc = mmc;
 	host->sdio_irq_en = 0;
@@ -666,10 +631,7 @@ static int mxs_mmc_probe(struct platform_device *pdev)
 
 	mxs_mmc_reset(host);
 
-	dma_cap_zero(mask);
-	dma_cap_set(DMA_SLAVE, mask);
-	ssp->dma_data.chan_irq = irq_dma;
-	ssp->dmach = dma_request_channel(mask, mxs_mmc_dma_filter, host);
+	ssp->dmach = dma_request_slave_channel(&pdev->dev, "rx-tx");
 	if (!ssp->dmach) {
 		dev_err(mmc_dev(host->mmc),
 			"%s: failed to request dma\n", __func__);
-- 
1.7.9.5

[PATCH v2 05/12] spi: mxs-spi: move to use generic DMA helper

[Shawn Guo]

With the generic DMA device tree helper supported by mxs-dma driver,
client devices only need to call dma_request_slave_channel() for
requesting a DMA channel from dmaengine.

Since mxs is a DT only platform now, along with the changes, the non-DT
case handling in probe function also gets removed.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
---
 Documentation/devicetree/bindings/spi/mxs-spi.txt |   12 +++--
 drivers/spi/spi-mxs.c                             |   60 ++++-----------------
 include/linux/spi/mxs-spi.h                       |    4 +-
 3 files changed, 18 insertions(+), 58 deletions(-)

diff --git a/Documentation/devicetree/bindings/spi/mxs-spi.txt b/Documentation/devicetree/bindings/spi/mxs-spi.txt
index e2e1395..3499b73 100644
--- a/Documentation/devicetree/bindings/spi/mxs-spi.txt
+++ b/Documentation/devicetree/bindings/spi/mxs-spi.txt
@@ -3,8 +3,11 @@
 Required properties:
 - compatible: Should be "fsl,<soc>-spi", where soc is "imx23" or "imx28"
 - reg: Offset and length of the register set for the device
-- interrupts: Should contain SSP interrupts (error irq first, dma irq second)
-- fsl,ssp-dma-channel: APBX DMA channel for the SSP
+- interrupts: Should contain SSP ERROR interrupt
+- dmas: DMA specifier, consisting of a phandle to DMA controller node
+  and SSP DMA channel ID.
+  Refer to dma.txt and fsl-mxs-dma.txt for details.
+- dma-names: Must be "rx-tx".
 
 Optional properties:
 - clock-frequency : Input clock frequency to the SPI block in Hz.
@@ -17,6 +20,7 @@ ssp0: ssp at 80010000 {
 	#size-cells = <0>;
 	compatible = "fsl,imx28-spi";
 	reg = <0x80010000 0x2000>;
-	interrupts = <96 82>;
-	fsl,ssp-dma-channel = <0>;
+	interrupts = <96>;
+	dmas = <&dma_apbh 0>;
+	dma-names = "rx-tx";
 };
diff --git a/drivers/spi/spi-mxs.c b/drivers/spi/spi-mxs.c
index 22a0af0..7b1c014 100644
--- a/drivers/spi/spi-mxs.c
+++ b/drivers/spi/spi-mxs.c
@@ -490,21 +490,6 @@ static int mxs_spi_transfer_one(struct spi_master *master,
 	return status;
 }
 
-static bool mxs_ssp_dma_filter(struct dma_chan *chan, void *param)
-{
-	struct mxs_ssp *ssp = param;
-
-	if (!mxs_dma_is_apbh(chan))
-		return false;
-
-	if (chan->chan_id != ssp->dma_channel)
-		return false;
-
-	chan->private = &ssp->dma_data;
-
-	return true;
-}
-
 static const struct of_device_id mxs_spi_dt_ids[] = {
 	{ .compatible = "fsl,imx23-spi", .data = (void *) IMX23_SSP, },
 	{ .compatible = "fsl,imx28-spi", .data = (void *) IMX28_SSP, },
@@ -520,13 +505,12 @@ static int mxs_spi_probe(struct platform_device *pdev)
 	struct spi_master *master;
 	struct mxs_spi *spi;
 	struct mxs_ssp *ssp;
-	struct resource *iores, *dmares;
+	struct resource *iores;
 	struct pinctrl *pinctrl;
 	struct clk *clk;
 	void __iomem *base;
-	int devid, dma_channel, clk_freq;
-	int ret = 0, irq_err, irq_dma;
-	dma_cap_mask_t mask;
+	int devid, clk_freq;
+	int ret = 0, irq_err;
 
 	/*
 	 * Default clock speed for the SPI core. 160MHz seems to
@@ -537,8 +521,7 @@ static int mxs_spi_probe(struct platform_device *pdev)
 
 	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	irq_err = platform_get_irq(pdev, 0);
-	irq_dma = platform_get_irq(pdev, 1);
-	if (!iores || irq_err < 0 || irq_dma < 0)
+	if (!iores || irq_err < 0)
 		return -EINVAL;
 
 	base = devm_ioremap_resource(&pdev->dev, iores);
@@ -553,32 +536,11 @@ static int mxs_spi_probe(struct platform_device *pdev)
 	if (IS_ERR(clk))
 		return PTR_ERR(clk);
 
-	if (np) {
-		devid = (enum mxs_ssp_id) of_id->data;
-		/*
-		 * TODO: This is a temporary solution and should be changed
-		 * to use generic DMA binding later when the helpers get in.
-		 */
-		ret = of_property_read_u32(np, "fsl,ssp-dma-channel",
-					   &dma_channel);
-		if (ret) {
-			dev_err(&pdev->dev,
-				"Failed to get DMA channel\n");
-			return -EINVAL;
-		}
-
-		ret = of_property_read_u32(np, "clock-frequency",
-					   &clk_freq);
-		if (ret)
-			clk_freq = clk_freq_default;
-	} else {
-		dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
-		if (!dmares)
-			return -EINVAL;
-		devid = pdev->id_entry->driver_data;
-		dma_channel = dmares->start;
+	devid = (enum mxs_ssp_id) of_id->data;
+	ret = of_property_read_u32(np, "clock-frequency",
+				   &clk_freq);
+	if (ret)
 		clk_freq = clk_freq_default;
-	}
 
 	master = spi_alloc_master(&pdev->dev, sizeof(*spi));
 	if (!master)
@@ -597,7 +559,6 @@ static int mxs_spi_probe(struct platform_device *pdev)
 	ssp->clk = clk;
 	ssp->base = base;
 	ssp->devid = devid;
-	ssp->dma_channel = dma_channel;
 
 	init_completion(&spi->c);
 
@@ -606,10 +567,7 @@ static int mxs_spi_probe(struct platform_device *pdev)
 	if (ret)
 		goto out_master_free;
 
-	dma_cap_zero(mask);
-	dma_cap_set(DMA_SLAVE, mask);
-	ssp->dma_data.chan_irq = irq_dma;
-	ssp->dmach = dma_request_channel(mask, mxs_ssp_dma_filter, ssp);
+	ssp->dmach = dma_request_slave_channel(&pdev->dev, "rx-tx");
 	if (!ssp->dmach) {
 		dev_err(ssp->dev, "Failed to request DMA\n");
 		goto out_master_free;
diff --git a/include/linux/spi/mxs-spi.h b/include/linux/spi/mxs-spi.h
index 61ae130..4835486 100644
--- a/include/linux/spi/mxs-spi.h
+++ b/include/linux/spi/mxs-spi.h
@@ -24,7 +24,7 @@
 #ifndef __LINUX_SPI_MXS_SPI_H__
 #define __LINUX_SPI_MXS_SPI_H__
 
-#include <linux/fsl/mxs-dma.h>
+#include <linux/dmaengine.h>
 
 #define ssp_is_old(host)	((host)->devid == IMX23_SSP)
 
@@ -137,9 +137,7 @@ struct mxs_ssp {
 	unsigned int			clk_rate;
 	enum mxs_ssp_id			devid;
 
-	int				dma_channel;
 	struct dma_chan			*dmach;
-	struct mxs_dma_data		dma_data;
 	unsigned int			dma_dir;
 	enum dma_transfer_direction	slave_dirn;
 	u32				ssp_pio_words[SSP_PIO_NUM];
-- 
1.7.9.5

[PATCH v2 06/12] i2c: i2c-mxs: move to use generic DMA helper

[Shawn Guo]

With the generic DMA device tree helper supported by mxs-dma driver,
client devices only need to call dma_request_slave_channel() for
requesting a DMA channel from dmaengine.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Wolfram Sang <wsa@the-dreams.de>
Cc: linux-i2c at vger.kernel.org
---
 Documentation/devicetree/bindings/i2c/i2c-mxs.txt |   12 ++++---
 drivers/i2c/busses/i2c-mxs.c                      |   40 ++-------------------
 2 files changed, 11 insertions(+), 41 deletions(-)

diff --git a/Documentation/devicetree/bindings/i2c/i2c-mxs.txt b/Documentation/devicetree/bindings/i2c/i2c-mxs.txt
index 7a3fe9e..4e1c8ac 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-mxs.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-mxs.txt
@@ -3,10 +3,13 @@
 Required properties:
 - compatible: Should be "fsl,<chip>-i2c"
 - reg: Should contain registers location and length
-- interrupts: Should contain ERROR and DMA interrupts
+- interrupts: Should contain ERROR interrupt number
 - clock-frequency: Desired I2C bus clock frequency in Hz.
                    Only 100000Hz and 400000Hz modes are supported.
-- fsl,i2c-dma-channel: APBX DMA channel for the I2C
+- dmas: DMA specifier, consisting of a phandle to DMA controller node
+  and I2C DMA channel ID.
+  Refer to dma.txt and fsl-mxs-dma.txt for details.
+- dma-names: Must be "rx-tx".
 
 Examples:
 
@@ -15,7 +18,8 @@ i2c0: i2c at 80058000 {
 	#size-cells = <0>;
 	compatible = "fsl,imx28-i2c";
 	reg = <0x80058000 2000>;
-	interrupts = <111 68>;
+	interrupts = <111>;
 	clock-frequency = <100000>;
-	fsl,i2c-dma-channel = <6>;
+	dmas = <&dma_apbx 6>;
+	dma-names = "rx-tx";
 };
diff --git a/drivers/i2c/busses/i2c-mxs.c b/drivers/i2c/busses/i2c-mxs.c
index 120f246..d1ba6b4 100644
--- a/drivers/i2c/busses/i2c-mxs.c
+++ b/drivers/i2c/busses/i2c-mxs.c
@@ -31,7 +31,6 @@
 #include <linux/of_i2c.h>
 #include <linux/dma-mapping.h>
 #include <linux/dmaengine.h>
-#include <linux/fsl/mxs-dma.h>
 
 #define DRIVER_NAME "mxs-i2c"
 
@@ -113,9 +112,7 @@ struct mxs_i2c_dev {
 	uint32_t timing1;
 
 	/* DMA support components */
-	int				dma_channel;
 	struct dma_chan         	*dmach;
-	struct mxs_dma_data		dma_data;
 	uint32_t			pio_data[2];
 	uint32_t			addr_data;
 	struct scatterlist		sg_io[2];
@@ -518,21 +515,6 @@ static const struct i2c_algorithm mxs_i2c_algo = {
 	.functionality = mxs_i2c_func,
 };
 
-static bool mxs_i2c_dma_filter(struct dma_chan *chan, void *param)
-{
-	struct mxs_i2c_dev *i2c = param;
-
-	if (!mxs_dma_is_apbx(chan))
-		return false;
-
-	if (chan->chan_id != i2c->dma_channel)
-		return false;
-
-	chan->private = &i2c->dma_data;
-
-	return true;
-}
-
 static void mxs_i2c_derive_timing(struct mxs_i2c_dev *i2c, int speed)
 {
 	/* The I2C block clock run at 24MHz */
@@ -577,17 +559,6 @@ static int mxs_i2c_get_ofdata(struct mxs_i2c_dev *i2c)
 	struct device_node *node = dev->of_node;
 	int ret;
 
-	/*
-	 * TODO: This is a temporary solution and should be changed
-	 * to use generic DMA binding later when the helpers get in.
-	 */
-	ret = of_property_read_u32(node, "fsl,i2c-dma-channel",
-				   &i2c->dma_channel);
-	if (ret) {
-		dev_err(dev, "Failed to get DMA channel!\n");
-		return -ENODEV;
-	}
-
 	ret = of_property_read_u32(node, "clock-frequency", &speed);
 	if (ret) {
 		dev_warn(dev, "No I2C speed selected, using 100kHz\n");
@@ -607,8 +578,7 @@ static int mxs_i2c_probe(struct platform_device *pdev)
 	struct pinctrl *pinctrl;
 	struct resource *res;
 	resource_size_t res_size;
-	int err, irq, dmairq;
-	dma_cap_mask_t mask;
+	int err, irq;
 
 	pinctrl = devm_pinctrl_get_select_default(dev);
 	if (IS_ERR(pinctrl))
@@ -620,9 +590,8 @@ static int mxs_i2c_probe(struct platform_device *pdev)
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	irq = platform_get_irq(pdev, 0);
-	dmairq = platform_get_irq(pdev, 1);
 
-	if (!res || irq < 0 || dmairq < 0)
+	if (!res || irq < 0)
 		return -ENOENT;
 
 	res_size = resource_size(res);
@@ -648,10 +617,7 @@ static int mxs_i2c_probe(struct platform_device *pdev)
 	}
 
 	/* Setup the DMA */
-	dma_cap_zero(mask);
-	dma_cap_set(DMA_SLAVE, mask);
-	i2c->dma_data.chan_irq = dmairq;
-	i2c->dmach = dma_request_channel(mask, mxs_i2c_dma_filter, i2c);
+	i2c->dmach = dma_request_slave_channel(dev, "rx-tx");
 	if (!i2c->dmach) {
 		dev_err(dev, "Failed to request dma\n");
 		return -ENODEV;
-- 
1.7.9.5

[PATCH v2 07/12] mtd: gpmi: move to use generic DMA helper

[Shawn Guo]

With the generic DMA device tree helper supported by mxs-dma driver,
client devices only need to call dma_request_slave_channel() for
requesting a DMA channel from dmaengine.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Artem Bityutskiy <dedekind1@gmail.com>
Cc: linux-mtd at lists.infradead.org
---
 .../devicetree/bindings/mtd/gpmi-nand.txt          |   17 ++++---
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c             |   51 +-------------------
 drivers/mtd/nand/gpmi-nand/gpmi-nand.h             |    3 +-
 3 files changed, 12 insertions(+), 59 deletions(-)

diff --git a/Documentation/devicetree/bindings/mtd/gpmi-nand.txt b/Documentation/devicetree/bindings/mtd/gpmi-nand.txt
index 3fb3f901..551b2a1 100644
--- a/Documentation/devicetree/bindings/mtd/gpmi-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/gpmi-nand.txt
@@ -7,10 +7,12 @@ Required properties:
   - compatible : should be "fsl,<chip>-gpmi-nand"
   - reg : should contain registers location and length for gpmi and bch.
   - reg-names: Should contain the reg names "gpmi-nand" and "bch"
-  - interrupts : The first is the DMA interrupt number for GPMI.
-                 The second is the BCH interrupt number.
-  - interrupt-names : The interrupt names "gpmi-dma", "bch";
-  - fsl,gpmi-dma-channel : Should contain the dma channel it uses.
+  - interrupts : BCH interrupt number.
+  - interrupt-names : Should be "bch".
+  - dmas: DMA specifier, consisting of a phandle to DMA controller node
+    and GPMI DMA channel ID.
+    Refer to dma.txt and fsl-mxs-dma.txt for details.
+  - dma-names: Must be "rx-tx".
 
 Optional properties:
   - nand-on-flash-bbt: boolean to enable on flash bbt option if not
@@ -27,9 +29,10 @@ gpmi-nand at 8000c000 {
 	#size-cells = <1>;
 	reg = <0x8000c000 2000>, <0x8000a000 2000>;
 	reg-names = "gpmi-nand", "bch";
-	interrupts = <88>, <41>;
-	interrupt-names = "gpmi-dma", "bch";
-	fsl,gpmi-dma-channel = <4>;
+	interrupts = <41>;
+	interrupt-names = "bch";
+	dmas = <&dma_apbh 4>;
+	dma-names = "rx-tx";
 
 	partition at 0 {
 	...
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 717881a..25ecfa1 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -36,7 +36,6 @@
 #define GPMI_NAND_GPMI_REGS_ADDR_RES_NAME  "gpmi-nand"
 #define GPMI_NAND_BCH_REGS_ADDR_RES_NAME   "bch"
 #define GPMI_NAND_BCH_INTERRUPT_RES_NAME   "bch"
-#define GPMI_NAND_DMA_INTERRUPT_RES_NAME   "gpmi-dma"
 
 /* add our owner bbt descriptor */
 static uint8_t scan_ff_pattern[] = { 0xff };
@@ -420,28 +419,6 @@ static void release_bch_irq(struct gpmi_nand_data *this)
 		free_irq(i, this);
 }
 
-static bool gpmi_dma_filter(struct dma_chan *chan, void *param)
-{
-	struct gpmi_nand_data *this = param;
-	int dma_channel = (int)this->private;
-
-	if (!mxs_dma_is_apbh(chan))
-		return false;
-	/*
-	 * only catch the GPMI dma channels :
-	 *	for mx23 :	MX23_DMA_GPMI0 ~ MX23_DMA_GPMI3
-	 *		(These four channels share the same IRQ!)
-	 *
-	 *	for mx28 :	MX28_DMA_GPMI0 ~ MX28_DMA_GPMI7
-	 *		(These eight channels share the same IRQ!)
-	 */
-	if (dma_channel == chan->chan_id) {
-		chan->private = &this->dma_data;
-		return true;
-	}
-	return false;
-}
-
 static void release_dma_channels(struct gpmi_nand_data *this)
 {
 	unsigned int i;
@@ -455,36 +432,10 @@ static void release_dma_channels(struct gpmi_nand_data *this)
 static int acquire_dma_channels(struct gpmi_nand_data *this)
 {
 	struct platform_device *pdev = this->pdev;
-	struct resource *r_dma;
-	struct device_node *dn;
-	u32 dma_channel;
-	int ret;
 	struct dma_chan *dma_chan;
-	dma_cap_mask_t mask;
-
-	/* dma channel, we only use the first one. */
-	dn = pdev->dev.of_node;
-	ret = of_property_read_u32(dn, "fsl,gpmi-dma-channel", &dma_channel);
-	if (ret) {
-		pr_err("unable to get DMA channel from dt.\n");
-		goto acquire_err;
-	}
-	this->private = (void *)dma_channel;
-
-	/* gpmi dma interrupt */
-	r_dma = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
-					GPMI_NAND_DMA_INTERRUPT_RES_NAME);
-	if (!r_dma) {
-		pr_err("Can't get resource for DMA\n");
-		goto acquire_err;
-	}
-	this->dma_data.chan_irq = r_dma->start;
 
 	/* request dma channel */
-	dma_cap_zero(mask);
-	dma_cap_set(DMA_SLAVE, mask);
-
-	dma_chan = dma_request_channel(mask, gpmi_dma_filter, this);
+	dma_chan = dma_request_slave_channel(&pdev->dev, "rx-tx");
 	if (!dma_chan) {
 		pr_err("Failed to request DMA channel.\n");
 		goto acquire_err;
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
index 0729477..a7685e3 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
@@ -20,7 +20,7 @@
 #include <linux/mtd/nand.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
-#include <linux/fsl/mxs-dma.h>
+#include <linux/dmaengine.h>
 
 #define GPMI_CLK_MAX 5 /* MX6Q needs five clocks */
 struct resources {
@@ -180,7 +180,6 @@ struct gpmi_nand_data {
 	/* DMA channels */
 #define DMA_CHANS		8
 	struct dma_chan		*dma_chans[DMA_CHANS];
-	struct mxs_dma_data	dma_data;
 	enum dma_ops_type	last_dma_type;
 	enum dma_ops_type	dma_type;
 	struct completion	dma_done;
-- 
1.7.9.5

[PATCH v2 08/12] serial: mxs-auart: move to use generic DMA helper

[Shawn Guo]

With the generic DMA device tree helper supported by mxs-dma driver,
client devices only need to call dma_request_slave_channel() for
requesting a DMA channel from dmaengine.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-serial at vger.kernel.org
---
 .../bindings/tty/serial/fsl-mxs-auart.txt          |   16 +++---
 drivers/tty/serial/mxs-auart.c                     |   52 ++------------------
 2 files changed, 11 insertions(+), 57 deletions(-)

diff --git a/Documentation/devicetree/bindings/tty/serial/fsl-mxs-auart.txt b/Documentation/devicetree/bindings/tty/serial/fsl-mxs-auart.txt
index 273a8d5..2c00ec6 100644
--- a/Documentation/devicetree/bindings/tty/serial/fsl-mxs-auart.txt
+++ b/Documentation/devicetree/bindings/tty/serial/fsl-mxs-auart.txt
@@ -5,20 +5,18 @@ Required properties:
   imx23 and imx28.
 - reg : Address and length of the register set for the device
 - interrupts : Should contain the auart interrupt numbers
-
-Optional properties:
-- fsl,auart-dma-channel : The DMA channels, the first is for RX, the other
-		is for TX. If you add this property, it also means that you
-		will enable the DMA support for the auart.
-		Note: due to the hardware bug in imx23(see errata : 2836),
-		only the imx28 can enable the DMA support for the auart.
+- dmas: DMA specifier, consisting of a phandle to DMA controller node
+  and AUART DMA channel ID.
+  Refer to dma.txt and fsl-mxs-dma.txt for details.
+- dma-names: "rx" for RX channel, "tx" for TX channel.
 
 Example:
 auart0: serial at 8006a000 {
 	compatible = "fsl,imx28-auart", "fsl,imx23-auart";
 	reg = <0x8006a000 0x2000>;
-	interrupts = <112 70 71>;
-	fsl,auart-dma-channel = <8 9>;
+	interrupts = <112>;
+	dmas = <&dma_apbx 8>, <&dma_apbx 9>;
+	dma-names = "rx", "tx";
 };
 
 Note: Each auart port should have an alias correctly numbered in "aliases"
diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index d549fe1..269a27c 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -35,7 +35,7 @@
 #include <linux/pinctrl/consumer.h>
 #include <linux/of_device.h>
 #include <linux/dma-mapping.h>
-#include <linux/fsl/mxs-dma.h>
+#include <linux/dmaengine.h>
 
 #include <asm/cacheflush.h>
 
@@ -148,11 +148,6 @@ struct mxs_auart_port {
 	struct device *dev;
 
 	/* for DMA */
-	struct mxs_dma_data dma_data;
-	int dma_channel_rx, dma_channel_tx;
-	int dma_irq_rx, dma_irq_tx;
-	int dma_channel;
-
 	struct scatterlist tx_sgl;
 	struct dma_chan	*tx_dma_chan;
 	void *tx_dma_buf;
@@ -440,20 +435,6 @@ static u32 mxs_auart_get_mctrl(struct uart_port *u)
 	return mctrl;
 }
 
-static bool mxs_auart_dma_filter(struct dma_chan *chan, void *param)
-{
-	struct mxs_auart_port *s = param;
-
-	if (!mxs_dma_is_apbx(chan))
-		return false;
-
-	if (s->dma_channel == chan->chan_id) {
-		chan->private = &s->dma_data;
-		return true;
-	}
-	return false;
-}
-
 static int mxs_auart_dma_prep_rx(struct mxs_auart_port *s);
 static void dma_rx_callback(void *arg)
 {
@@ -545,21 +526,11 @@ static void mxs_auart_dma_exit(struct mxs_auart_port *s)
 
 static int mxs_auart_dma_init(struct mxs_auart_port *s)
 {
-	dma_cap_mask_t mask;
-
 	if (auart_dma_enabled(s))
 		return 0;
 
-	/* We do not get the right DMA channels. */
-	if (s->dma_channel_rx == -1 || s->dma_channel_tx == -1)
-		return -EINVAL;
-
 	/* init for RX */
-	dma_cap_zero(mask);
-	dma_cap_set(DMA_SLAVE, mask);
-	s->dma_channel = s->dma_channel_rx;
-	s->dma_data.chan_irq = s->dma_irq_rx;
-	s->rx_dma_chan = dma_request_channel(mask, mxs_auart_dma_filter, s);
+	s->rx_dma_chan = dma_request_slave_channel(s->dev, "rx");
 	if (!s->rx_dma_chan)
 		goto err_out;
 	s->rx_dma_buf = kzalloc(UART_XMIT_SIZE, GFP_KERNEL | GFP_DMA);
@@ -567,9 +538,7 @@ static int mxs_auart_dma_init(struct mxs_auart_port *s)
 		goto err_out;
 
 	/* init for TX */
-	s->dma_channel = s->dma_channel_tx;
-	s->dma_data.chan_irq = s->dma_irq_tx;
-	s->tx_dma_chan = dma_request_channel(mask, mxs_auart_dma_filter, s);
+	s->tx_dma_chan = dma_request_slave_channel(s->dev, "tx");
 	if (!s->tx_dma_chan)
 		goto err_out;
 	s->tx_dma_buf = kzalloc(UART_XMIT_SIZE, GFP_KERNEL | GFP_DMA);
@@ -1020,7 +989,6 @@ static int serial_mxs_probe_dt(struct mxs_auart_port *s,
 		struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
-	u32 dma_channel[2];
 	int ret;
 
 	if (!np)
@@ -1034,20 +1002,8 @@ static int serial_mxs_probe_dt(struct mxs_auart_port *s,
 	}
 	s->port.line = ret;
 
-	s->dma_irq_rx = platform_get_irq(pdev, 1);
-	s->dma_irq_tx = platform_get_irq(pdev, 2);
+	s->flags |= MXS_AUART_DMA_CONFIG;
 
-	ret = of_property_read_u32_array(np, "fsl,auart-dma-channel",
-					dma_channel, 2);
-	if (ret == 0) {
-		s->dma_channel_rx = dma_channel[0];
-		s->dma_channel_tx = dma_channel[1];
-
-		s->flags |= MXS_AUART_DMA_CONFIG;
-	} else {
-		s->dma_channel_rx = -1;
-		s->dma_channel_tx = -1;
-	}
 	return 0;
 }
 
-- 
1.7.9.5

[PATCH v2 09/12] ASoC: dmaengine_pcm: add snd_dmaengine_generic_pcm_open()

[Shawn Guo]

With generic DMA device tree binding and helper function
dma_request_slave_channel() in place, dmaengine_pcm should support
that in requesting DMA channel for users that support generic DMA
device tree binding.

Add a new API snd_dmaengine_generic_pcm_open() as the variant of
snd_dmaengine_pcm_open().  It takes DMA client struct device pointer
and slave channel name as arguments and calls generic DMA helper
dma_request_slave_channel() to request DMA channel from dmaengine.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: alsa-devel at alsa-project.org
---
Mark,

Please maintain a topic branch for the patch if it looks good to you.
It should be useful for any dmaengine_pcm user that is moving to
generic DMA device tree binding.

Thanks,
Shawn

 include/sound/dmaengine_pcm.h |    2 ++
 sound/soc/soc-dmaengine-pcm.c |   39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/include/sound/dmaengine_pcm.h b/include/sound/dmaengine_pcm.h
index b877334..452df15 100644
--- a/include/sound/dmaengine_pcm.h
+++ b/include/sound/dmaengine_pcm.h
@@ -43,6 +43,8 @@ snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream
 
 int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
 	dma_filter_fn filter_fn, void *filter_data);
+int snd_dmaengine_generic_pcm_open(struct snd_pcm_substream *substream,
+				   struct device *dev, const char *name);
 int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream);
 
 struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream);
diff --git a/sound/soc/soc-dmaengine-pcm.c b/sound/soc/soc-dmaengine-pcm.c
index 111b7d92..970eb2b 100644
--- a/sound/soc/soc-dmaengine-pcm.c
+++ b/sound/soc/soc-dmaengine-pcm.c
@@ -304,6 +304,45 @@ int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open);
 
 /**
+ * snd_dmaengine_generic_pcm_open - Open a dmaengine based PCM substream
+ * @substream: PCM substream
+ * @dev: pointer to DMA client device structure
+ * @name: DMA slave channel name
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ *
+ * This function is a variant of snd_dmaengine_pcm_open(). It takes different
+ * parameters and calls generic DMA helper dma_request_slave_channel() to
+ * request a DMA channel from dmaengine.
+ */
+int snd_dmaengine_generic_pcm_open(struct snd_pcm_substream *substream,
+				   struct device *dev, const char *name)
+{
+	struct dmaengine_pcm_runtime_data *prtd;
+	int ret;
+
+	ret = snd_pcm_hw_constraint_integer(substream->runtime,
+					    SNDRV_PCM_HW_PARAM_PERIODS);
+	if (ret < 0)
+		return ret;
+
+	prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
+	if (!prtd)
+		return -ENOMEM;
+
+	prtd->dma_chan = dma_request_slave_channel(dev, name);
+	if (!prtd->dma_chan) {
+		kfree(prtd);
+		return -ENXIO;
+	}
+
+	substream->runtime->private_data = prtd;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_dmaengine_generic_pcm_open);
+
+/**
  * snd_dmaengine_pcm_close - Close a dmaengine based PCM substream
  * @substream: PCM substream
  */
-- 
1.7.9.5

[PATCH v2 10/12] ASoC: mxs: move to use generic DMA helper

[Shawn Guo]

With the generic DMA device tree helper supported by mxs-dma driver,
we now only need to call snd_dmaengine_generic_pcm_open() to have
dmaengine_pcm request DMA channel from dmaengine by calling generic
DMA helper dma_request_slave_channel().

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: alsa-devel at alsa-project.org
---
 .../devicetree/bindings/sound/mxs-saif.txt         |   18 +++++----
 sound/soc/mxs/mxs-pcm.c                            |   42 ++------------------
 sound/soc/mxs/mxs-pcm.h                            |    5 ---
 sound/soc/mxs/mxs-saif.c                           |   28 +------------
 sound/soc/mxs/mxs-saif.h                           |    1 -
 5 files changed, 15 insertions(+), 79 deletions(-)

diff --git a/Documentation/devicetree/bindings/sound/mxs-saif.txt b/Documentation/devicetree/bindings/sound/mxs-saif.txt
index c37ba61..89b3821 100644
--- a/Documentation/devicetree/bindings/sound/mxs-saif.txt
+++ b/Documentation/devicetree/bindings/sound/mxs-saif.txt
@@ -3,8 +3,11 @@
 Required properties:
 - compatible: Should be "fsl,<chip>-saif"
 - reg: Should contain registers location and length
-- interrupts: Should contain ERROR and DMA interrupts
-- fsl,saif-dma-channel: APBX DMA channel for the SAIF
+- interrupts: Should contain ERROR interrupt number
+- dmas: DMA specifier, consisting of a phandle to DMA controller node
+  and SAIF DMA channel ID.
+  Refer to dma.txt and fsl-mxs-dma.txt for details.
+- dma-names: Must be "rx-tx".
 
 Optional properties:
 - fsl,saif-master: phandle to the master SAIF.  It's only required for
@@ -23,14 +26,15 @@ aliases {
 saif0: saif at 80042000 {
 	compatible = "fsl,imx28-saif";
 	reg = <0x80042000 2000>;
-	interrupts = <59 80>;
-	fsl,saif-dma-channel = <4>;
+	interrupts = <59>;
+	dmas = <&dma_apbx 4>;
+	dma-names = "rx-tx";
 };
 
 saif1: saif at 80046000 {
 	compatible = "fsl,imx28-saif";
 	reg = <0x80046000 2000>;
-	interrupts = <58 81>;
-	fsl,saif-dma-channel = <5>;
-	fsl,saif-master = <&saif0>;
+	interrupts = <58>;
+	dmas = <&dma_apbx 5>;
+	dma-names = "rx-tx";
 };
diff --git a/sound/soc/mxs/mxs-pcm.c b/sound/soc/mxs/mxs-pcm.c
index 564b5b6..10b20ed 100644
--- a/sound/soc/mxs/mxs-pcm.c
+++ b/sound/soc/mxs/mxs-pcm.c
@@ -28,7 +28,6 @@
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/dmaengine.h>
-#include <linux/fsl/mxs-dma.h>
 
 #include <sound/core.h>
 #include <sound/initval.h>
@@ -39,11 +38,6 @@
 
 #include "mxs-pcm.h"
 
-struct mxs_pcm_dma_data {
-	struct mxs_dma_data dma_data;
-	struct mxs_pcm_dma_params *dma_params;
-};
-
 static struct snd_pcm_hardware snd_mxs_hardware = {
 	.info			= SNDRV_PCM_INFO_MMAP |
 				  SNDRV_PCM_INFO_MMAP_VALID |
@@ -64,22 +58,6 @@ static struct snd_pcm_hardware snd_mxs_hardware = {
 
 };
 
-static bool filter(struct dma_chan *chan, void *param)
-{
-	struct mxs_pcm_dma_data *pcm_dma_data = param;
-	struct mxs_pcm_dma_params *dma_params = pcm_dma_data->dma_params;
-
-	if (!mxs_dma_is_apbx(chan))
-		return false;
-
-	if (chan->chan_id != dma_params->chan_num)
-		return false;
-
-	chan->private = &pcm_dma_data->dma_data;
-
-	return true;
-}
-
 static int snd_mxs_pcm_hw_params(struct snd_pcm_substream *substream,
 				struct snd_pcm_hw_params *params)
 {
@@ -91,35 +69,21 @@ static int snd_mxs_pcm_hw_params(struct snd_pcm_substream *substream,
 static int snd_mxs_open(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
-	struct mxs_pcm_dma_data *pcm_dma_data;
 	int ret;
 
-	pcm_dma_data = kzalloc(sizeof(*pcm_dma_data), GFP_KERNEL);
-	if (pcm_dma_data == NULL)
-		return -ENOMEM;
-
-	pcm_dma_data->dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
-	pcm_dma_data->dma_data.chan_irq = pcm_dma_data->dma_params->chan_irq;
-
-	ret = snd_dmaengine_pcm_open(substream, filter, pcm_dma_data);
-	if (ret) {
-		kfree(pcm_dma_data);
+	ret = snd_dmaengine_generic_pcm_open(substream, rtd->cpu_dai->dev,
+					     "rx-tx");
+	if (ret)
 		return ret;
-	}
 
 	snd_soc_set_runtime_hwparams(substream, &snd_mxs_hardware);
 
-	snd_dmaengine_pcm_set_data(substream, pcm_dma_data);
-
 	return 0;
 }
 
 static int snd_mxs_close(struct snd_pcm_substream *substream)
 {
-	struct mxs_pcm_dma_data *pcm_dma_data = snd_dmaengine_pcm_get_data(substream);
-
 	snd_dmaengine_pcm_close(substream);
-	kfree(pcm_dma_data);
 
 	return 0;
 }
diff --git a/sound/soc/mxs/mxs-pcm.h b/sound/soc/mxs/mxs-pcm.h
index 35ba2ca..bc685b6 100644
--- a/sound/soc/mxs/mxs-pcm.h
+++ b/sound/soc/mxs/mxs-pcm.h
@@ -19,11 +19,6 @@
 #ifndef _MXS_PCM_H
 #define _MXS_PCM_H
 
-struct mxs_pcm_dma_params {
-	int chan_irq;
-	int chan_num;
-};
-
 int mxs_pcm_platform_register(struct device *dev);
 void mxs_pcm_platform_unregister(struct device *dev);
 
diff --git a/sound/soc/mxs/mxs-saif.c b/sound/soc/mxs/mxs-saif.c
index 3a2aa1d..0c70903 100644
--- a/sound/soc/mxs/mxs-saif.c
+++ b/sound/soc/mxs/mxs-saif.c
@@ -26,7 +26,6 @@
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/time.h>
-#include <linux/fsl/mxs-dma.h>
 #include <linux/pinctrl/consumer.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
@@ -369,7 +368,6 @@ static int mxs_saif_startup(struct snd_pcm_substream *substream,
 			   struct snd_soc_dai *cpu_dai)
 {
 	struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
-	snd_soc_dai_set_dma_data(cpu_dai, substream, &saif->dma_param);
 
 	/* clear error status to 0 for each re-open */
 	saif->fifo_underrun = 0;
@@ -659,7 +657,7 @@ static irqreturn_t mxs_saif_irq(int irq, void *dev_id)
 static int mxs_saif_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
-	struct resource *iores, *dmares;
+	struct resource *iores;
 	struct mxs_saif *saif;
 	struct pinctrl *pinctrl;
 	int ret = 0;
@@ -721,22 +719,6 @@ static int mxs_saif_probe(struct platform_device *pdev)
 	if (IS_ERR(saif->base))
 		return PTR_ERR(saif->base);
 
-	dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
-	if (!dmares) {
-		/*
-		 * TODO: This is a temporary solution and should be changed
-		 * to use generic DMA binding later when the helplers get in.
-		 */
-		ret = of_property_read_u32(np, "fsl,saif-dma-channel",
-					   &saif->dma_param.chan_num);
-		if (ret) {
-			dev_err(&pdev->dev, "failed to get dma channel\n");
-			return ret;
-		}
-	} else {
-		saif->dma_param.chan_num = dmares->start;
-	}
-
 	saif->irq = platform_get_irq(pdev, 0);
 	if (saif->irq < 0) {
 		ret = saif->irq;
@@ -753,14 +735,6 @@ static int mxs_saif_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	saif->dma_param.chan_irq = platform_get_irq(pdev, 1);
-	if (saif->dma_param.chan_irq < 0) {
-		ret = saif->dma_param.chan_irq;
-		dev_err(&pdev->dev, "failed to get dma irq resource: %d\n",
-			ret);
-		return ret;
-	}
-
 	platform_set_drvdata(pdev, saif);
 
 	ret = snd_soc_register_dai(&pdev->dev, &mxs_saif_dai);
diff --git a/sound/soc/mxs/mxs-saif.h b/sound/soc/mxs/mxs-saif.h
index 3cb342e..53eaa4b 100644
--- a/sound/soc/mxs/mxs-saif.h
+++ b/sound/soc/mxs/mxs-saif.h
@@ -117,7 +117,6 @@ struct mxs_saif {
 	unsigned int mclk_in_use;
 	void __iomem *base;
 	int irq;
-	struct mxs_pcm_dma_params dma_param;
 	unsigned int id;
 	unsigned int master_id;
 	unsigned int cur_rate;
-- 
1.7.9.5

[PATCH v2 11/12] dma: mxs-dma: remove code left from generic DMA binding conversion

[Shawn Guo]

With all mxs-dma clients moved to use generic DMA helper, the code
left from generic DMA binding conversion can be removed now.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
---
 drivers/dma/mxs-dma.c       |   23 -----------------------
 include/linux/fsl/mxs-dma.h |   20 --------------------
 2 files changed, 43 deletions(-)
 delete mode 100644 include/linux/fsl/mxs-dma.h

diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c
index b48a79c..65ac0ea 100644
--- a/drivers/dma/mxs-dma.c
+++ b/drivers/dma/mxs-dma.c
@@ -23,7 +23,6 @@
 #include <linux/dmaengine.h>
 #include <linux/delay.h>
 #include <linux/module.h>
-#include <linux/fsl/mxs-dma.h>
 #include <linux/stmp_device.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
@@ -197,24 +196,6 @@ static struct mxs_dma_chan *to_mxs_dma_chan(struct dma_chan *chan)
 	return container_of(chan, struct mxs_dma_chan, chan);
 }
 
-int mxs_dma_is_apbh(struct dma_chan *chan)
-{
-	struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan);
-	struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
-
-	return dma_is_apbh(mxs_dma);
-}
-EXPORT_SYMBOL_GPL(mxs_dma_is_apbh);
-
-int mxs_dma_is_apbx(struct dma_chan *chan)
-{
-	struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan);
-	struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
-
-	return !dma_is_apbh(mxs_dma);
-}
-EXPORT_SYMBOL_GPL(mxs_dma_is_apbx);
-
 static void mxs_dma_reset_chan(struct mxs_dma_chan *mxs_chan)
 {
 	struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
@@ -349,13 +330,9 @@ static irqreturn_t mxs_dma_int_handler(int irq, void *dev_id)
 static int mxs_dma_alloc_chan_resources(struct dma_chan *chan)
 {
 	struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan);
-	struct mxs_dma_data *data = chan->private;
 	struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
 	int ret;
 
-	if (data)
-		mxs_chan->chan_irq = data->chan_irq;
-
 	mxs_chan->ccw = dma_alloc_coherent(mxs_dma->dma_device.dev,
 				CCW_BLOCK_SIZE, &mxs_chan->ccw_phys,
 				GFP_KERNEL);
diff --git a/include/linux/fsl/mxs-dma.h b/include/linux/fsl/mxs-dma.h
deleted file mode 100644
index 55d8702..0000000
--- a/include/linux/fsl/mxs-dma.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
- * Copyright 2011 Freescale Semiconductor, Inc. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#ifndef __MACH_MXS_DMA_H__
-#define __MACH_MXS_DMA_H__
-
-#include <linux/dmaengine.h>
-
-struct mxs_dma_data {
-	int chan_irq;
-};
-
-extern int mxs_dma_is_apbh(struct dma_chan *chan);
-extern int mxs_dma_is_apbx(struct dma_chan *chan);
-#endif /* __MACH_MXS_DMA_H__ */
-- 
1.7.9.5

[PATCH v2 12/12] ARM: dts: remove old DMA binding data from client nodes

[Shawn Guo]

After adopting generic DMA device tree binding, now channel interrupt
number is defined in DMA controller node, and channel ID is listed in
"dmas" property.  So the DMA channel interrupt number in client nodes'
"interrupts" property and fsl,<module>-dma-channel which are used by
old customized DMA binding can be removed now.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
---
 arch/arm/boot/dts/imx23.dtsi   |   15 ++++++-------
 arch/arm/boot/dts/imx28.dtsi   |   46 ++++++++++++++++------------------------
 arch/arm/boot/dts/imx6qdl.dtsi |    4 ++--
 3 files changed, 26 insertions(+), 39 deletions(-)

diff --git a/arch/arm/boot/dts/imx23.dtsi b/arch/arm/boot/dts/imx23.dtsi
index 64f901f..c32a651 100644
--- a/arch/arm/boot/dts/imx23.dtsi
+++ b/arch/arm/boot/dts/imx23.dtsi
@@ -72,23 +72,21 @@
 				#size-cells = <1>;
 				reg = <0x8000c000 0x2000>, <0x8000a000 0x2000>;
 				reg-names = "gpmi-nand", "bch";
-				interrupts = <13>, <56>;
-				interrupt-names = "gpmi-dma", "bch";
+				interrupts = <56>;
+				interrupt-names = "bch";
 				clocks = <&clks 34>;
 				clock-names = "gpmi_io";
 				dmas = <&dma_apbh 4>;
 				dma-names = "rx-tx";
-				fsl,gpmi-dma-channel = <4>;
 				status = "disabled";
 			};
 
 			ssp0: ssp at 80010000 {
 				reg = <0x80010000 0x2000>;
-				interrupts = <15 14>;
+				interrupts = <15>;
 				clocks = <&clks 33>;
 				dmas = <&dma_apbh 1>;
 				dma-names = "rx-tx";
-				fsl,ssp-dma-channel = <1>;
 				status = "disabled";
 			};
 
@@ -360,11 +358,10 @@
 
 			ssp1: ssp at 80034000 {
 				reg = <0x80034000 0x2000>;
-				interrupts = <2 20>;
+				interrupts = <2>;
 				clocks = <&clks 33>;
 				dmas = <&dma_apbh 2>;
 				dma-names = "rx-tx";
-				fsl,ssp-dma-channel = <2>;
 				status = "disabled";
 			};
 
@@ -465,7 +462,7 @@
 			auart0: serial at 8006c000 {
 				compatible = "fsl,imx23-auart";
 				reg = <0x8006c000 0x2000>;
-				interrupts = <24 25 23>;
+				interrupts = <24>;
 				clocks = <&clks 32>;
 				dmas = <&dma_apbx 6>, <&dma_apbx 7>;
 				dma-names = "rx", "tx";
@@ -475,7 +472,7 @@
 			auart1: serial at 8006e000 {
 				compatible = "fsl,imx23-auart";
 				reg = <0x8006e000 0x2000>;
-				interrupts = <59 60 58>;
+				interrupts = <59>;
 				clocks = <&clks 32>;
 				dmas = <&dma_apbx 8>, <&dma_apbx 9>;
 				dma-names = "rx", "tx";
diff --git a/arch/arm/boot/dts/imx28.dtsi b/arch/arm/boot/dts/imx28.dtsi
index 3b87088..b80ce5c 100644
--- a/arch/arm/boot/dts/imx28.dtsi
+++ b/arch/arm/boot/dts/imx28.dtsi
@@ -60,7 +60,7 @@
 
 			hsadc at 80002000 {
 				reg = <0x80002000 0x2000>;
-				interrupts = <13 87>;
+				interrupts = <13>;
 				dmas = <&dma_apbh 12>;
 				dma-names = "rx";
 				status = "disabled";
@@ -94,13 +94,12 @@
 				#size-cells = <1>;
 				reg = <0x8000c000 0x2000>, <0x8000a000 0x2000>;
 				reg-names = "gpmi-nand", "bch";
-				interrupts = <88>, <41>;
-				interrupt-names = "gpmi-dma", "bch";
+				interrupts = <41>;
+				interrupt-names = "bch";
 				clocks = <&clks 50>;
 				clock-names = "gpmi_io";
 				dmas = <&dma_apbh 4>;
 				dma-names = "rx-tx";
-				fsl,gpmi-dma-channel = <4>;
 				status = "disabled";
 			};
 
@@ -108,11 +107,10 @@
 				#address-cells = <1>;
 				#size-cells = <0>;
 				reg = <0x80010000 0x2000>;
-				interrupts = <96 82>;
+				interrupts = <96>;
 				clocks = <&clks 46>;
 				dmas = <&dma_apbh 0>;
 				dma-names = "rx-tx";
-				fsl,ssp-dma-channel = <0>;
 				status = "disabled";
 			};
 
@@ -120,11 +118,10 @@
 				#address-cells = <1>;
 				#size-cells = <0>;
 				reg = <0x80012000 0x2000>;
-				interrupts = <97 83>;
+				interrupts = <97>;
 				clocks = <&clks 47>;
 				dmas = <&dma_apbh 1>;
 				dma-names = "rx-tx";
-				fsl,ssp-dma-channel = <1>;
 				status = "disabled";
 			};
 
@@ -132,11 +129,10 @@
 				#address-cells = <1>;
 				#size-cells = <0>;
 				reg = <0x80014000 0x2000>;
-				interrupts = <98 84>;
+				interrupts = <98>;
 				clocks = <&clks 48>;
 				dmas = <&dma_apbh 2>;
 				dma-names = "rx-tx";
-				fsl,ssp-dma-channel = <2>;
 				status = "disabled";
 			};
 
@@ -144,11 +140,10 @@
 				#address-cells = <1>;
 				#size-cells = <0>;
 				reg = <0x80016000 0x2000>;
-				interrupts = <99 85>;
+				interrupts = <99>;
 				clocks = <&clks 49>;
 				dmas = <&dma_apbh 3>;
 				dma-names = "rx-tx";
-				fsl,ssp-dma-channel = <3>;
 				status = "disabled";
 			};
 
@@ -720,7 +715,7 @@
 			lcdif at 80030000 {
 				compatible = "fsl,imx28-lcdif";
 				reg = <0x80030000 0x2000>;
-				interrupts = <38 86>;
+				interrupts = <38>;
 				clocks = <&clks 55>;
 				dmas = <&dma_apbh 13>;
 				dma-names = "rx";
@@ -797,11 +792,10 @@
 			saif0: saif at 80042000 {
 				compatible = "fsl,imx28-saif";
 				reg = <0x80042000 0x2000>;
-				interrupts = <59 80>;
+				interrupts = <59>;
 				clocks = <&clks 53>;
 				dmas = <&dma_apbx 4>;
 				dma-names = "rx-tx";
-				fsl,saif-dma-channel = <4>;
 				status = "disabled";
 			};
 
@@ -813,11 +807,10 @@
 			saif1: saif at 80046000 {
 				compatible = "fsl,imx28-saif";
 				reg = <0x80046000 0x2000>;
-				interrupts = <58 81>;
+				interrupts = <58>;
 				clocks = <&clks 54>;
 				dmas = <&dma_apbx 5>;
 				dma-names = "rx-tx";
-				fsl,saif-dma-channel = <5>;
 				status = "disabled";
 			};
 
@@ -831,7 +824,7 @@
 
 			spdif at 80054000 {
 				reg = <0x80054000 0x2000>;
-				interrupts = <45 66>;
+				interrupts = <45>;
 				dmas = <&dma_apbx 2>;
 				dma-names = "tx";
 				status = "disabled";
@@ -848,11 +841,10 @@
 				#size-cells = <0>;
 				compatible = "fsl,imx28-i2c";
 				reg = <0x80058000 0x2000>;
-				interrupts = <111 68>;
+				interrupts = <111>;
 				clock-frequency = <100000>;
 				dmas = <&dma_apbx 6>;
 				dma-names = "rx-tx";
-				fsl,i2c-dma-channel = <6>;
 				status = "disabled";
 			};
 
@@ -861,11 +853,10 @@
 				#size-cells = <0>;
 				compatible = "fsl,imx28-i2c";
 				reg = <0x8005a000 0x2000>;
-				interrupts = <110 69>;
+				interrupts = <110>;
 				clock-frequency = <100000>;
 				dmas = <&dma_apbx 7>;
 				dma-names = "rx-tx";
-				fsl,i2c-dma-channel = <7>;
 				status = "disabled";
 			};
 
@@ -887,10 +878,9 @@
 			auart0: serial at 8006a000 {
 				compatible = "fsl,imx28-auart", "fsl,imx23-auart";
 				reg = <0x8006a000 0x2000>;
-				interrupts = <112 70 71>;
+				interrupts = <112>;
 				dmas = <&dma_apbx 8>, <&dma_apbx 9>;
 				dma-names = "rx", "tx";
-				fsl,auart-dma-channel = <8 9>;
 				clocks = <&clks 45>;
 				status = "disabled";
 			};
@@ -898,7 +888,7 @@
 			auart1: serial at 8006c000 {
 				compatible = "fsl,imx28-auart", "fsl,imx23-auart";
 				reg = <0x8006c000 0x2000>;
-				interrupts = <113 72 73>;
+				interrupts = <113>;
 				dmas = <&dma_apbx 10>, <&dma_apbx 11>;
 				dma-names = "rx", "tx";
 				clocks = <&clks 45>;
@@ -908,7 +898,7 @@
 			auart2: serial at 8006e000 {
 				compatible = "fsl,imx28-auart", "fsl,imx23-auart";
 				reg = <0x8006e000 0x2000>;
-				interrupts = <114 74 75>;
+				interrupts = <114>;
 				dmas = <&dma_apbx 12>, <&dma_apbx 13>;
 				dma-names = "rx", "tx";
 				clocks = <&clks 45>;
@@ -918,7 +908,7 @@
 			auart3: serial at 80070000 {
 				compatible = "fsl,imx28-auart", "fsl,imx23-auart";
 				reg = <0x80070000 0x2000>;
-				interrupts = <115 76 77>;
+				interrupts = <115>;
 				dmas = <&dma_apbx 14>, <&dma_apbx 15>;
 				dma-names = "rx", "tx";
 				clocks = <&clks 45>;
@@ -928,7 +918,7 @@
 			auart4: serial at 80072000 {
 				compatible = "fsl,imx28-auart", "fsl,imx23-auart";
 				reg = <0x80072000 0x2000>;
-				interrupts = <116 78 79>;
+				interrupts = <116>;
 				dmas = <&dma_apbx 0>, <&dma_apbx 1>;
 				dma-names = "rx", "tx";
 				clocks = <&clks 45>;
diff --git a/arch/arm/boot/dts/imx6qdl.dtsi b/arch/arm/boot/dts/imx6qdl.dtsi
index e6b8781..ba7eed8 100644
--- a/arch/arm/boot/dts/imx6qdl.dtsi
+++ b/arch/arm/boot/dts/imx6qdl.dtsi
@@ -81,8 +81,8 @@
 			#size-cells = <1>;
 			reg = <0x00112000 0x2000>, <0x00114000 0x2000>;
 			reg-names = "gpmi-nand", "bch";
-			interrupts = <0 13 0x04>, <0 15 0x04>;
-			interrupt-names = "gpmi-dma", "bch";
+			interrupts = <0 15 0x04>;
+			interrupt-names = "bch";
 			clocks = <&clks 152>, <&clks 153>, <&clks 151>,
 				 <&clks 150>, <&clks 149>;
 			clock-names = "gpmi_io", "gpmi_apb", "gpmi_bch",
-- 
1.7.9.5

[PATCH v3 09/12] ASoC: dmaengine_pcm: add snd_dmaengine_generic_pcm_open()

[Shawn Guo]

With generic DMA device tree binding and helper function
dma_request_slave_channel() in place, dmaengine_pcm should support
that in requesting DMA channel for users that support generic DMA
device tree binding.

Add a new API snd_dmaengine_generic_pcm_open() as the variant of
snd_dmaengine_pcm_open().  It takes DMA client struct device pointer
and slave channel name as arguments and calls generic DMA helper
dma_request_slave_channel() to request DMA channel from dmaengine.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: alsa-devel at alsa-project.org
---
Changes since v2:
 - Drop 'const' from argument 'name' to fix the warning below.

sound/soc/soc-dmaengine-pcm.c: In function 'snd_dmaengine_generic_pcm_open':
sound/soc/soc-dmaengine-pcm.c:333:2: warning: passing argument 2 of 'dma_request_slave_channel' discards 'const' qualifier from pointer target type [enabled by default]
include/linux/dmaengine.h:971:18: note: expected 'char *' but argument is of type 'const char *'

 include/sound/dmaengine_pcm.h |    2 ++
 sound/soc/soc-dmaengine-pcm.c |   39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/include/sound/dmaengine_pcm.h b/include/sound/dmaengine_pcm.h
index b877334..394272b 100644
--- a/include/sound/dmaengine_pcm.h
+++ b/include/sound/dmaengine_pcm.h
@@ -43,6 +43,8 @@ snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream
 
 int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
 	dma_filter_fn filter_fn, void *filter_data);
+int snd_dmaengine_generic_pcm_open(struct snd_pcm_substream *substream,
+				   struct device *dev, char *name);
 int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream);
 
 struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream);
diff --git a/sound/soc/soc-dmaengine-pcm.c b/sound/soc/soc-dmaengine-pcm.c
index 111b7d92..e9d9897 100644
--- a/sound/soc/soc-dmaengine-pcm.c
+++ b/sound/soc/soc-dmaengine-pcm.c
@@ -304,6 +304,45 @@ int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open);
 
 /**
+ * snd_dmaengine_generic_pcm_open - Open a dmaengine based PCM substream
+ * @substream: PCM substream
+ * @dev: pointer to DMA client device structure
+ * @name: DMA slave channel name
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ *
+ * This function is a variant of snd_dmaengine_pcm_open(). It takes different
+ * parameters and calls generic DMA helper dma_request_slave_channel() to
+ * request a DMA channel from dmaengine.
+ */
+int snd_dmaengine_generic_pcm_open(struct snd_pcm_substream *substream,
+				   struct device *dev, char *name)
+{
+	struct dmaengine_pcm_runtime_data *prtd;
+	int ret;
+
+	ret = snd_pcm_hw_constraint_integer(substream->runtime,
+					    SNDRV_PCM_HW_PARAM_PERIODS);
+	if (ret < 0)
+		return ret;
+
+	prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
+	if (!prtd)
+		return -ENOMEM;
+
+	prtd->dma_chan = dma_request_slave_channel(dev, name);
+	if (!prtd->dma_chan) {
+		kfree(prtd);
+		return -ENXIO;
+	}
+
+	substream->runtime->private_data = prtd;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_dmaengine_generic_pcm_open);
+
+/**
  * snd_dmaengine_pcm_close - Close a dmaengine based PCM substream
  * @substream: PCM substream
  */
-- 
1.7.9.5

[PATCH v2 01/12] ARM: dts: add generic DMA device tree binding for mxs-dma

[Arnd Bergmann]

On Tuesday 05 March 2013, Shawn Guo wrote:
>                                  <&clks 150>, <&clks 149>;
>                         clock-names = "gpmi_io", "gpmi_apb", "gpmi_bch",
>                                       "gpmi_bch_apb", "per1_bch";
> +                       dmas = <&dma_apbh 0>;
> +                       dma-names = "gpmi";
>                         fsl,gpmi-dma-channel = <0>;
>                         status = "disabled";

Looks like a small bug:

In patch "[PATCH v2 07/12] mtd: gpmi: move to use generic DMA helper" you require the
dma-names property for this device to be "rx-tx", not "gpmi".

	Arnd

[PATCH v2 00/12] ARM: mxs: move to generic DMA device tree binding

[Arnd Bergmann]

On Tuesday 05 March 2013, Shawn Guo wrote:
> The series converts mxs-dma and its clients to generic DMA device tree
> binding/helper.
> 
> I published a branch below to ease people who is willing to help
> testing the series.

Looks all good, aside from the bug I found in the first patch.

Reviewed-by: Arnd Bergmann <arnd@arndb.de>

[PATCH v3 09/12] ASoC: dmaengine_pcm: add snd_dmaengine_generic_pcm_open()

[Marek Vasut]

Hi Shawn,

> With generic DMA device tree binding and helper function
> dma_request_slave_channel() in place, dmaengine_pcm should support
> that in requesting DMA channel for users that support generic DMA
> device tree binding.
> 
> Add a new API snd_dmaengine_generic_pcm_open() as the variant of
> snd_dmaengine_pcm_open().  It takes DMA client struct device pointer
> and slave channel name as arguments and calls generic DMA helper
> dma_request_slave_channel() to request DMA channel from dmaengine.
> 
> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
> Cc: alsa-devel at alsa-project.org
> ---
> Changes since v2:
>  - Drop 'const' from argument 'name' to fix the warning below.
> 
[...]

v3 changelog missing ;-) What did you adjust here please?

Best regards,
Marek Vasut

[PATCH v2 08/12] serial: mxs-auart: move to use generic DMA helper

[Greg Kroah-Hartman]

On Tue, Mar 05, 2013 at 08:24:00PM +0800, Shawn Guo wrote:
> With the generic DMA device tree helper supported by mxs-dma driver,
> client devices only need to call dma_request_slave_channel() for
> requesting a DMA channel from dmaengine.
> 
> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: linux-serial at vger.kernel.org


Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

[PATCH v2 01/12] ARM: dts: add generic DMA device tree binding for mxs-dma

[Shawn Guo]

On Tue, Mar 05, 2013 at 07:38:29PM +0000, Arnd Bergmann wrote:
> On Tuesday 05 March 2013, Shawn Guo wrote:
> >                                  <&clks 150>, <&clks 149>;
> >                         clock-names = "gpmi_io", "gpmi_apb", "gpmi_bch",
> >                                       "gpmi_bch_apb", "per1_bch";
> > +                       dmas = <&dma_apbh 0>;
> > +                       dma-names = "gpmi";
> >                         fsl,gpmi-dma-channel = <0>;
> >                         status = "disabled";
> 
> Looks like a small bug:
> 
> In patch "[PATCH v2 07/12] mtd: gpmi: move to use generic DMA helper" you require the
> dma-names property for this device to be "rx-tx", not "gpmi".
> 
Dammit.  I missed this one.  Thanks for spotting it.  Fixed.

Shawn

[PATCH v3 09/12] ASoC: dmaengine_pcm: add snd_dmaengine_generic_pcm_open()

[Shawn Guo]

On Wed, Mar 06, 2013 at 12:28:18AM +0100, Marek Vasut wrote:
> Hi Shawn,
> 
> > With generic DMA device tree binding and helper function
> > dma_request_slave_channel() in place, dmaengine_pcm should support
> > that in requesting DMA channel for users that support generic DMA
> > device tree binding.
> > 
> > Add a new API snd_dmaengine_generic_pcm_open() as the variant of
> > snd_dmaengine_pcm_open().  It takes DMA client struct device pointer
> > and slave channel name as arguments and calls generic DMA helper
> > dma_request_slave_channel() to request DMA channel from dmaengine.
> > 
> > Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
> > Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
> > Cc: alsa-devel at alsa-project.org
> > ---
> > Changes since v2:
> >  - Drop 'const' from argument 'name' to fix the warning below.
> > 
> [...]
> 
> v3 changelog missing ;-) What did you adjust here please?

The "Changes since v2" means v3 changelog.

Shawn

[PATCH v3 09/12] ASoC: dmaengine_pcm: add snd_dmaengine_generic_pcm_open()

[Marek Vasut]

Dear Shawn Guo,

> On Wed, Mar 06, 2013 at 12:28:18AM +0100, Marek Vasut wrote:
> > Hi Shawn,
> > 
> > > With generic DMA device tree binding and helper function
> > > dma_request_slave_channel() in place, dmaengine_pcm should support
> > > that in requesting DMA channel for users that support generic DMA
> > > device tree binding.
> > > 
> > > Add a new API snd_dmaengine_generic_pcm_open() as the variant of
> > > snd_dmaengine_pcm_open().  It takes DMA client struct device pointer
> > > and slave channel name as arguments and calls generic DMA helper
> > > dma_request_slave_channel() to request DMA channel from dmaengine.
> > > 
> > > Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
> > > Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
> > > Cc: alsa-devel at alsa-project.org
> > > ---
> > > 
> > > Changes since v2:
> > >  - Drop 'const' from argument 'name' to fix the warning below.
> > 
> > [...]
> > 
> > v3 changelog missing ;-) What did you adjust here please?
> 
> The "Changes since v2" means v3 changelog.

Bah, it was too late then, sorry.

Best regards,
Marek Vasut

[PATCH v3 09/12] ASoC: dmaengine_pcm: add snd_dmaengine_generic_pcm_open()

[Russell King - ARM Linux]

On Tue, Mar 05, 2013 at 10:37:27PM +0800, Shawn Guo wrote:
> With generic DMA device tree binding and helper function
> dma_request_slave_channel() in place, dmaengine_pcm should support
> that in requesting DMA channel for users that support generic DMA
> device tree binding.

This purpetuates the brain-dead behaviour of the existing ASoC DMA
engine layer, which makes it unsuitable for platforms with special DMA
memory requirements.

The problem is that the DMA mask to be used for allocating DMA-able
memory is the DMA engine struct device, not the struct device associated
with the ASoC device.

I got this right in my ASoC generic DMA engine layer.  Converting this
layer is far from trivial though, and as my test platform has now become
my entire network firewall, I'm not doing any testing on that anymore.

[PATCH v3 09/12] ASoC: dmaengine_pcm: add snd_dmaengine_generic_pcm_open()

[Mark Brown]

On Wed, Mar 06, 2013 at 05:13:33PM +0000, Russell King - ARM Linux wrote:

> This purpetuates the brain-dead behaviour of the existing ASoC DMA
> engine layer, which makes it unsuitable for platforms with special DMA
> memory requirements.

> The problem is that the DMA mask to be used for allocating DMA-able
> memory is the DMA engine struct device, not the struct device associated
> with the ASoC device.

> I got this right in my ASoC generic DMA engine layer.  Converting this
> layer is far from trivial though, and as my test platform has now become
> my entire network firewall, I'm not doing any testing on that anymore.

Could you go into more detail here please?  Looking at the code I'm not
seeing any allocations done by the library code at all, the allocations
are all done by the individual platform DMA drivers so I don't see
anything stopping them doing what they need.
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[PATCH v3 09/12] ASoC: dmaengine_pcm: add snd_dmaengine_generic_pcm_open()

[Russell King - ARM Linux]

On Thu, Mar 07, 2013 at 10:33:19AM +0800, Mark Brown wrote:
> On Wed, Mar 06, 2013 at 05:13:33PM +0000, Russell King - ARM Linux wrote:
> 
> > This purpetuates the brain-dead behaviour of the existing ASoC DMA
> > engine layer, which makes it unsuitable for platforms with special DMA
> > memory requirements.
> 
> > The problem is that the DMA mask to be used for allocating DMA-able
> > memory is the DMA engine struct device, not the struct device associated
> > with the ASoC device.
> 
> > I got this right in my ASoC generic DMA engine layer.  Converting this
> > layer is far from trivial though, and as my test platform has now become
> > my entire network firewall, I'm not doing any testing on that anymore.
> 
> Could you go into more detail here please?  Looking at the code I'm not
> seeing any allocations done by the library code at all, the allocations
> are all done by the individual platform DMA drivers so I don't see
> anything stopping them doing what they need.

I don't know what else you require apart from the description above.  Isn't
it rather obvious that you can't preallocate the ALSA buffer against the
DMA engine device if you can only obtain the DMA engine device in the open
function?

Notice in the code below where the DMA engine is obtained in pcm_new and
the buffer is preallocated against the DMA engine struct device.  That's
exactly what I'm talking about.

/*
 * Generic ASoC DMA engine backend
 *
 * Copyright (C) 2012 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * We expect the DMA engine to give accurate residue information,
 * returning the number of bytes left to complete to the requested
 * cookie.  We also expect the DMA engine to be able to resume
 * submitted descriptors after a suspend/resume cycle.
 */
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spinlock.h>

#include <sound/core.h>
#include <sound/soc-dmaengine.h>
#include <sound/soc.h>
#include <sound/pcm_params.h>

#define BUFFER_SIZE_MAX		65536
#define PERIOD_SIZE_MIN		32
#define PERIOD_SIZE_MAX		16384
#define PERIODS_MIN		2
#define PERIODS_MAX		256

struct buf_info {
	struct scatterlist sg;
	dma_cookie_t cookie;
};

struct soc_dma_chan {
	const struct soc_dma_config *conf;
	spinlock_t lock;
	struct dma_chan *chan;
	struct dma_slave_config cfg;
	enum dma_transfer_direction dir;
	unsigned nr_periods;
	unsigned sg_index;
	unsigned stopped;
	unsigned cyclic;
	dma_cookie_t cyclic_cookie;
	struct buf_info buf[PERIODS_MAX];
};

struct soc_dma_info {
	struct soc_dma_chan *chan[2];
};

static const struct snd_pcm_hardware soc_dmaengine_hardware = {
	.info			= SNDRV_PCM_INFO_MMAP |
				  SNDRV_PCM_INFO_MMAP_VALID |
				  SNDRV_PCM_INFO_INTERLEAVED |
				  SNDRV_PCM_INFO_PAUSE |
				  SNDRV_PCM_INFO_RESUME,
	.period_bytes_min	= PERIOD_SIZE_MIN,
	.period_bytes_max	= PERIOD_SIZE_MAX,
	.periods_min		= PERIODS_MIN,
	.periods_max		= PERIODS_MAX,
	.buffer_bytes_max	= BUFFER_SIZE_MAX,
};

static int soc_dmaengine_submit(struct snd_pcm_substream *substream,
	struct soc_dma_chan *dma);

static void soc_dmaengine_callback(void *data)
{
	struct snd_pcm_substream *substream = data;
	struct soc_dma_chan *dma = substream->runtime->private_data;
	int ret;

	snd_pcm_period_elapsed(substream);

	if (!dma->stopped && !dma->cyclic) {
		spin_lock(&dma->lock);
		ret = soc_dmaengine_submit(substream, dma);
		spin_unlock(&dma->lock);

		if (ret == 0)
			dma_async_issue_pending(dma->chan);
		else
			pr_err("%s: failed to submit next DMA buffer\n", __func__);
	}
}

static int soc_dmaengine_submit(struct snd_pcm_substream *substream,
	struct soc_dma_chan *dma)
{
	struct dma_async_tx_descriptor *tx;
	struct dma_chan *ch = dma->chan;
	struct buf_info *buf;
	unsigned sg_index;

	sg_index = dma->sg_index;

	buf = &dma->buf[sg_index];

	tx = dmaengine_prep_slave_sg(ch, &buf->sg, 1, dma->dir,
		DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
	if (tx) {
		tx->callback = soc_dmaengine_callback;
		tx->callback_param = substream;

		buf->cookie = dmaengine_submit(tx);

		sg_index++;
		if (sg_index >= dma->nr_periods)
			sg_index = 0;
		dma->sg_index = sg_index;
	}

	return tx ? 0 : -ENOMEM;
}

static int soc_dmaengine_start(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct soc_dma_chan *dma = runtime->private_data;
	unsigned long flags;
	unsigned i;
	int ret = 0;

	if (!dma->cyclic) {
		spin_lock_irqsave(&dma->lock, flags);
		for (i = 0; i < dma->nr_periods; i++) {
			ret = soc_dmaengine_submit(substream, dma);
			if (ret)
				break;
		}
		spin_unlock_irqrestore(&dma->lock, flags);
		if (ret == 0) {
			dma->stopped = 0;
			dma_async_issue_pending(dma->chan);
		} else {
			dma->stopped = 1;
			dmaengine_terminate_all(dma->chan);
		}
	} else {
		struct dma_async_tx_descriptor *tx;

		tx = dmaengine_prep_dma_cyclic(dma->chan, runtime->dma_addr,
			snd_pcm_lib_buffer_bytes(substream),
			snd_pcm_lib_period_bytes(substream), dma->dir,
			DMA_CTRL_ACK | DMA_PREP_INTERRUPT);
		if (tx) {
			tx->callback = soc_dmaengine_callback;
			tx->callback_param = substream;

			dma->cyclic_cookie = dmaengine_submit(tx);
			dma_async_issue_pending(dma->chan);
		}
	}

	return ret;
}

static int soc_dmaengine_stop(struct snd_pcm_substream *substream)
{
	struct soc_dma_chan *dma = substream->runtime->private_data;

	dma->stopped = 1;
	dmaengine_terminate_all(dma->chan);

	return 0;
}

static int soc_dmaengine_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct soc_dma_info *info = snd_soc_platform_get_drvdata(rtd->platform);
	struct soc_dma_chan *dma = info->chan[substream->stream];
	int ret = 0;

	if (!dma)
		return -EINVAL;

	runtime->hw = soc_dmaengine_hardware;
	runtime->hw.fifo_size = dma->conf->fifo_size;

	if (dma->conf->align) {
		/*
		 * FIXME: Ideally, there should be some way to query
		 * this from the DMA engine itself.
		 *
		 * It would also be helpful to know the maximum size
		 * a scatterlist entry can be to set the period size.
		 */
		ret = snd_pcm_hw_constraint_step(runtime, 0,
			SNDRV_PCM_HW_PARAM_PERIOD_BYTES, dma->conf->align);
		if (ret)
			goto err;

		ret = snd_pcm_hw_constraint_step(runtime, 0,
			SNDRV_PCM_HW_PARAM_BUFFER_BYTES, dma->conf->align);
		if (ret)
			goto err;
	}

	runtime->private_data = dma;

 err:
	return ret;
}

static int soc_dmaengine_close(struct snd_pcm_substream *substream)
{
	return 0;
}

static int soc_dmaengine_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
{
	int ret = snd_pcm_lib_malloc_pages(substream,
			params_buffer_bytes(params));

	return ret < 0 ? ret : 0;
}

static int soc_dmaengine_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct soc_dma_chan *dma = runtime->private_data;
	size_t buf_size = snd_pcm_lib_buffer_bytes(substream);
	size_t period = snd_pcm_lib_period_bytes(substream);
	dma_addr_t addr = runtime->dma_addr;
	unsigned i;

	/* Create an array of sg entries, one for each period */
	for (i = 0; i < PERIODS_MAX && buf_size; i++) {
		BUG_ON(buf_size < period);

		sg_dma_address(&dma->buf[i].sg) = addr;
		sg_dma_len(&dma->buf[i].sg) = period;

		addr += period;
		buf_size -= period;
	}

	if (buf_size) {
		pr_err("DMA buffer size not a multiple of the period size: residue=%zu\n", buf_size);
		return -EINVAL;
	}

	dma->nr_periods = i;
	dma->sg_index = 0;

	return 0;
}

static int soc_dmaengine_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct soc_dma_chan *dma = runtime->private_data;
	int ret;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		ret = soc_dmaengine_start(substream);
		break;

	case SNDRV_PCM_TRIGGER_STOP:
		ret = soc_dmaengine_stop(substream);
		break;

	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		ret = dmaengine_pause(dma->chan);
		break;

	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	case SNDRV_PCM_TRIGGER_RESUME:
		ret = dmaengine_resume(dma->chan);
		break;

	default:
		ret = -EINVAL;
	}

	return ret;
}

static snd_pcm_uframes_t soc_dmaengine_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct soc_dma_chan *dma = runtime->private_data;
	struct dma_chan *ch = dma->chan;
	struct dma_tx_state state;
	unsigned bytes;

	if (dma->cyclic) {
		ch->device->device_tx_status(ch, dma->cyclic_cookie, &state);

		bytes = snd_pcm_lib_buffer_bytes(substream) - state.residue;
	} else {
		unsigned index, pos;
		size_t period = snd_pcm_lib_period_bytes(substream);
		unsigned long flags;
		enum dma_status status;
		dma_cookie_t cookie;

		/*
		 * Get the next-to-be-submitted index, and the last submitted
		 * cookie value.  We use this to obtain the DMA engine state.
		 */
		spin_lock_irqsave(&dma->lock, flags);
		index = dma->sg_index;
		do {
			cookie = dma->buf[index].cookie;
			status = ch->device->device_tx_status(ch, cookie, &state);
			if (status == DMA_SUCCESS) {
				index++;
				if (index > dma->nr_periods)
					index = 0;
			}
		} while (status == DMA_SUCCESS);
		spin_unlock_irqrestore(&dma->lock, flags);

		/* The end of the current DMA buffer */
		pos = (index + 1) * period;
		/* Now take off the residue */
		bytes = pos - state.residue;
		/* And correct for wrap-around */
		if (bytes >= period * dma->nr_periods)
			bytes -= period * dma->nr_periods;
	}

	return bytes_to_frames(runtime, bytes);
}

static int soc_dmaengine_mmap(struct snd_pcm_substream *substream,
	struct vm_area_struct *vma)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_dma_buffer *buf = runtime->dma_buffer_p;

	return dma_mmap_writecombine(buf->dev.dev, vma,
		runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);
}

static struct snd_pcm_ops soc_dmaengine_ops = {
	.open = soc_dmaengine_open,
	.close = soc_dmaengine_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = soc_dmaengine_hw_params,
	.hw_free = snd_pcm_lib_free_pages,
	.prepare = soc_dmaengine_prepare,
	.trigger = soc_dmaengine_trigger,
	.pointer = soc_dmaengine_pointer,
	.mmap = soc_dmaengine_mmap,
};

static struct soc_dma_chan *soc_dmaengine_alloc(void)
{
	struct soc_dma_chan *dma = kzalloc(sizeof(*dma), GFP_KERNEL);
	unsigned i;

	if (dma) {
		spin_lock_init(&dma->lock);
		for (i = 0; i < PERIODS_MAX; i++)
			sg_init_table(&dma->buf[i].sg, 1);
	}
	return dma;
}

static struct dma_chan *soc_dmaengine_get(enum dma_transaction_type type,
	struct soc_dma_config *cfg)
{
	dma_cap_mask_t m;

	dma_cap_zero(m);
	dma_cap_set(type, m);
	return dma_request_channel(m, cfg->filter, cfg->data);
}

static int soc_dmaengine_request(struct soc_dma_chan *dma,
	struct soc_dma_config *cfg, unsigned stream)
{
	int ret;

	dma->conf = cfg;
	dma->chan = soc_dmaengine_get(DMA_CYCLIC, cfg);
	if (!dma->chan)
		dma->chan = soc_dmaengine_get(DMA_SLAVE, cfg);
	else
		dma->cyclic = 1;
	if (!dma->chan) {
		ret = -ENXIO;
		goto err_dma_req;
	}

	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
		dma->dir = DMA_MEM_TO_DEV;
		dma->cfg.direction = DMA_MEM_TO_DEV;
		dma->cfg.dst_addr = cfg->reg;
		dma->cfg.dst_addr_width = cfg->width;
		dma->cfg.dst_maxburst = cfg->maxburst;
	} else {
		dma->dir = DMA_DEV_TO_MEM;
		dma->cfg.direction = DMA_DEV_TO_MEM;
		dma->cfg.src_addr = cfg->reg;
		dma->cfg.src_addr_width = cfg->width;
		dma->cfg.src_maxburst = cfg->maxburst;
	}

	ret = dmaengine_slave_config(dma->chan, &dma->cfg);
	if (ret)
		goto err_dma_cfg;

	return 0;

 err_dma_cfg:
	dma_release_channel(dma->chan);
	dma->chan = NULL;
 err_dma_req:
	return ret;
}

static void soc_dmaengine_release(struct soc_dma_chan *dma)
{
	if (dma && dma->chan)
		dma_release_channel(dma->chan);
	kfree(dma);
}

static int soc_dmaengine_preallocate_buffer(struct snd_pcm *pcm,
	unsigned stream, struct soc_dma_chan *dma)
{
	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	int ret = 0;

	if (substream) {
		struct snd_dma_buffer *buf = &substream->dma_buffer;

		buf->dev.type = SNDRV_DMA_TYPE_DEV;
		buf->dev.dev = dma->chan->device->dev;
		buf->private_data = NULL;
		buf->area = dma_alloc_writecombine(buf->dev.dev,
				BUFFER_SIZE_MAX, &buf->addr, GFP_KERNEL);
		if (!buf->area)
			return -ENOMEM;

		buf->bytes = BUFFER_SIZE_MAX;
	}
	return ret;
}

static int soc_dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_pcm *pcm = rtd->pcm;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct soc_dma_info *info;
	unsigned stream;
	int ret = 0;

	if (!cpu_dai)
		return -EINVAL;

	if (!cpu_dai->playback_dma_data &&
	    !cpu_dai->capture_dma_data) {
		pr_err("soc_dmaengine: %s has no cpu_dai DMA data - incorrect probe ordering?\n",
			rtd->card->name);
		return -EINVAL;
	}

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	for (stream = 0; stream < ARRAY_SIZE(pcm->streams); stream++) {
		struct soc_dma_config *cfg = NULL;
		struct soc_dma_chan *dma;

		if (stream == SNDRV_PCM_STREAM_PLAYBACK)
			cfg = cpu_dai->playback_dma_data;
		else if (stream == SNDRV_PCM_STREAM_CAPTURE)
			cfg = cpu_dai->capture_dma_data;

		if (!cfg)
			continue;

		info->chan[stream] = dma = soc_dmaengine_alloc();
		if (!dma) {
			ret = -ENOMEM;
			break;
		}

		ret = soc_dmaengine_request(dma, cfg, stream);
		if (ret)
			return ret;

		ret = soc_dmaengine_preallocate_buffer(pcm, stream, dma);
		if (ret)
			break;
	}

	if (ret) {
		for (stream = 0; stream < ARRAY_SIZE(info->chan); stream++)
			soc_dmaengine_release(info->chan[stream]);
		kfree(info);
	} else {
		snd_soc_platform_set_drvdata(rtd->platform, info);
	}

	return ret;
}

/*
 * Use write-combining memory here: the standard ALSA
 * snd_free_dev_pages() doesn't support this.
 */
static void soc_dmaengine_pcm_free(struct snd_pcm *pcm)
{
	unsigned stream;

	for (stream = 0; stream < ARRAY_SIZE(pcm->streams); stream++) {
		struct snd_pcm_substream *substream = pcm->streams[stream].substream;
		struct snd_dma_buffer *buf;

		if (!substream)
			continue;
		buf = &substream->dma_buffer;
		if (!buf->area)
			continue;

		if (buf->dev.type == SNDRV_DMA_TYPE_DEV)
			dma_free_writecombine(buf->dev.dev, buf->bytes,
					      buf->area, buf->addr);
		else
			snd_dma_free_pages(buf);
		buf->area = NULL;
	}
}

/*
 * This is annoying - we can't have symetry with .pcm_new because .pcm_free
 * is called after the runtime information has been removed.  It would be
 * better if we could find somewhere else to store our soc_dma_info pointer.
 */
static int soc_dmaengine_plat_remove(struct snd_soc_platform *platform)
{
	struct soc_dma_info *info = snd_soc_platform_get_drvdata(platform);
	unsigned stream;

	for (stream = 0; stream < ARRAY_SIZE(info->chan); stream++)
		soc_dmaengine_release(info->chan[stream]);
	kfree(info);

	return 0;
}

static struct snd_soc_platform_driver soc_dmaengine_platform = {
	.remove = soc_dmaengine_plat_remove,
	.pcm_new = soc_dmaengine_pcm_new,
	.pcm_free = soc_dmaengine_pcm_free,
	.ops = &soc_dmaengine_ops,
	/* Wait until the cpu_dai has been probed */
	.probe_order = SND_SOC_COMP_ORDER_LATE,
};

static int soc_dmaengine_probe(struct platform_device *pdev)
{
	return snd_soc_register_platform(&pdev->dev, &soc_dmaengine_platform);
}

static int soc_dmaengine_remove(struct platform_device *pdev)
{
	snd_soc_unregister_platform(&pdev->dev);
	return 0;
}

static struct platform_driver soc_dmaengine_driver = {
	.driver = {
		.name = "soc-dmaengine",
		.owner = THIS_MODULE,
	},
	.probe = soc_dmaengine_probe,
	.remove = soc_dmaengine_remove,
};

module_platform_driver(soc_dmaengine_driver);

MODULE_AUTHOR("Russell King");
MODULE_DESCRIPTION("ALSA SoC DMA engine driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:soc-dmaengine");

[PATCH v3 09/12] ASoC: dmaengine_pcm: add snd_dmaengine_generic_pcm_open()

[Mark Brown]

On Thu, Mar 07, 2013 at 09:18:04AM +0000, Russell King - ARM Linux wrote:
> On Thu, Mar 07, 2013 at 10:33:19AM +0800, Mark Brown wrote:

> > Could you go into more detail here please?  Looking at the code I'm not
> > seeing any allocations done by the library code at all, the allocations
> > are all done by the individual platform DMA drivers so I don't see
> > anything stopping them doing what they need.

> I don't know what else you require apart from the description above.  Isn't
> it rather obvious that you can't preallocate the ALSA buffer against the
> DMA engine device if you can only obtain the DMA engine device in the open
> function?

The bit I'm missing is why this is particularly hard to change, it
doesn't seem like a massive refactoring and there's not many users.
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[PATCH v3 09/12] ASoC: dmaengine_pcm: add snd_dmaengine_generic_pcm_open()

[Russell King - ARM Linux]

On Thu, Mar 07, 2013 at 05:31:23PM +0800, Mark Brown wrote:
> On Thu, Mar 07, 2013 at 09:18:04AM +0000, Russell King - ARM Linux wrote:
> > On Thu, Mar 07, 2013 at 10:33:19AM +0800, Mark Brown wrote:
> 
> > > Could you go into more detail here please?  Looking at the code I'm not
> > > seeing any allocations done by the library code at all, the allocations
> > > are all done by the individual platform DMA drivers so I don't see
> > > anything stopping them doing what they need.
> 
> > I don't know what else you require apart from the description above.  Isn't
> > it rather obvious that you can't preallocate the ALSA buffer against the
> > DMA engine device if you can only obtain the DMA engine device in the open
> > function?
> 
> The bit I'm missing is why this is particularly hard to change, it
> doesn't seem like a massive refactoring and there's not many users.

Well, it requires the thing to be reworked along with everyone who uses
it, specifically snd_dmaengine_pcm_open() and snd_dmaengine_pcm_close().

Now, I could use your excuse that you've given me in the past: "I don't
have much of that hardware so I can't test the changes, so I'm not going
to touch this code evar again!"  (That's basically what you said about
the AC'97 struct device stuff.)  You can't have it both ways and always
shovel what you don't like onto other people.

So... I'll just go back to quietly sitting on my SA11x0 ASoC support
and totally ignoring mainline with it because of obstructive
maintainers. :)

[PATCH v3 09/12] ASoC: dmaengine_pcm: add snd_dmaengine_generic_pcm_open()

[Mark Brown]

On Thu, Mar 07, 2013 at 11:20:06AM +0000, Russell King - ARM Linux wrote:
> On Thu, Mar 07, 2013 at 05:31:23PM +0800, Mark Brown wrote:

> > The bit I'm missing is why this is particularly hard to change, it
> > doesn't seem like a massive refactoring and there's not many users.

> Well, it requires the thing to be reworked along with everyone who uses
> it, specifically snd_dmaengine_pcm_open() and snd_dmaengine_pcm_close().

Oh, OK.  That doesn't seem like a big deal really - it's certainly not a
throw the thing out and start over job.  It sounded like you'd identifed
some new issue you'd not mentioned rather than just the same issue, it
wasn't clear to me that it was the same issue.

> Now, I could use your excuse that you've given me in the past: "I don't
> have much of that hardware so I can't test the changes, so I'm not going
> to touch this code evar again!"  (That's basically what you said about

I'm not particularly asking you to fix this yourself except in that it
seems like it's an important issue for you.  If anything something like
this patch ought to make things marginally easier to deal with by
factoring out a very small bit of the code.

> the AC'97 struct device stuff.)  You can't have it both ways and always
> shovel what you don't like onto other people.

I'm aware of the issue, as are the people who've worked on the code.
Speaking personally I just happen to disagree with you about the urgency
here - it's not like it's the only problem we've got and the practical
effects are limited to a subset of mostly older hardware which generally
doesn't use dmaeengine in the first place.  I imagine that a similar
thing is true for everyone else.

There's plenty of other hardware that doesn't work right now, another
pressing example I can think of is devices that subdivide an audio
interface into multiple unrelated streams of audio, you aren't alone in
having hardware that needs the frameworks improving in order to achieve
basic functionality.
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[PATCH v2 06/12] i2c: i2c-mxs: move to use generic DMA helper

[Wolfram Sang]

On Tue, Mar 05, 2013 at 08:23:58PM +0800, Shawn Guo wrote:
> With the generic DMA device tree helper supported by mxs-dma driver,
> client devices only need to call dma_request_slave_channel() for
> requesting a DMA channel from dmaengine.
> 
> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
> Cc: Wolfram Sang <wsa@the-dreams.de>
> Cc: linux-i2c at vger.kernel.org

Yay, DMA helpers \o/ Assuming the helpers work, for the i2c driver:

Acked-by: Wolfram Sang <wsa@the-dreams.de>

Thanks for doing this!