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Commit 8e6152bc authored by Zhangfei Gao's avatar Zhangfei Gao Committed by Vinod Koul
Browse files

dmaengine: Add hisilicon k3 DMA engine driver 



Add dmaengine driver for hisilicon k3 platform based on virt_dma

Signed-off-by: default avatarZhangfei Gao <zhangfei.gao@linaro.org>
Tested-by: default avatarKai Yang <jean.yangkai@huawei.com>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 04299366

Documentation/devicetree/bindings/dma/k3dma.txt

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* Hisilicon K3 DMA controller



See dma.txt first



Required properties:

- compatible: Should be "hisilicon,k3-dma-1.0"

- reg: Should contain DMA registers location and length.

- interrupts: Should contain one interrupt shared by all channel

- #dma-cells: see dma.txt, should be 1, para number

- dma-channels: physical channels supported

- dma-requests: virtual channels supported, each virtual channel

		have specific request line

- clocks: clock required



Example:



Controller:

		dma0: dma@fcd02000 {

			compatible = "hisilicon,k3-dma-1.0";

			reg = <0xfcd02000 0x1000>;

			#dma-cells = <1>;

			dma-channels = <16>;

			dma-requests = <27>;

			interrupts = <0 12 4>;

			clocks = <&pclk>;

			status = "disable";

		};



Client:

Use specific request line passing from dmax

For example, i2c0 read channel request line is 18, while write channel use 19



		i2c0: i2c@fcb08000 {

			compatible = "snps,designware-i2c";

			dmas =	<&dma0 18          /* read channel */

				 &dma0 19>;        /* write channel */

			dma-names = "rx", "tx";

		};



		i2c1: i2c@fcb09000 {

			compatible = "snps,designware-i2c";

			dmas =	<&dma0 20          /* read channel */

				 &dma0 21>;        /* write channel */

			dma-names = "rx", "tx";

		};

drivers/dma/Kconfig

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@@ -300,6 +300,15 @@ config DMA_JZ4740 
	select DMA_ENGINE

	select DMA_ENGINE

	select DMA_VIRTUAL_CHANNELS

	select DMA_VIRTUAL_CHANNELS





config K3_DMA

	tristate "Hisilicon K3 DMA support"

	depends on ARCH_HI3xxx

	select DMA_ENGINE

	select DMA_VIRTUAL_CHANNELS

	help

	  Support the DMA engine for Hisilicon K3 platform

	  devices.



config DMA_ENGINE

config DMA_ENGINE

	bool

	bool

drivers/dma/Makefile

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@@ -39,3 +39,4 @@ obj-$(CONFIG_MMP_TDMA) += mmp_tdma.o 
obj-$(CONFIG_DMA_OMAP) += omap-dma.o

obj-$(CONFIG_DMA_OMAP) += omap-dma.o

obj-$(CONFIG_MMP_PDMA) += mmp_pdma.o

obj-$(CONFIG_MMP_PDMA) += mmp_pdma.o

obj-$(CONFIG_DMA_JZ4740) += dma-jz4740.o

obj-$(CONFIG_DMA_JZ4740) += dma-jz4740.o

obj-$(CONFIG_K3_DMA) += k3dma.o

drivers/dma/k3dma.c

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File added.

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