dmaengine: Introduce DW AXI DMAC driver

This patch adds support for the DW AXI DMAC controller.
DW AXI DMAC is a part of HSDK development board from Synopsys.

In this driver implementation only DMA_MEMCPY transfers are
supported.
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

MAINTAINERS

@@ -13336,6 +13336,12 @@ S:	Maintained
 F:	drivers/gpio/gpio-dwapb.c
 F:	Documentation/devicetree/bindings/gpio/snps-dwapb-gpio.txt
 
+SYNOPSYS DESIGNWARE AXI DMAC DRIVER
+M:	Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
+S:	Maintained
+F:	drivers/dma/dwi-axi-dmac/
+F:	Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.txt
+
 SYNOPSYS DESIGNWARE DMAC DRIVER
 M:	Viresh Kumar <vireshk@kernel.org>
 R:	Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/dma/Kconfig

@@ -187,6 +187,16 @@ config DMA_SUN6I
 	help
 	  Support for the DMA engine first found in Allwinner A31 SoCs.
 
+config DW_AXI_DMAC
+	tristate "Synopsys DesignWare AXI DMA support"
+	depends on OF || COMPILE_TEST
+	select DMA_ENGINE
+	select DMA_VIRTUAL_CHANNELS
+	help
+	  Enable support for Synopsys DesignWare AXI DMA controller.
+	  NOTE: This driver wasn't tested on 64 bit platform because
+	  of lack 64 bit platform with Synopsys DW AXI DMAC.
+
 config EP93XX_DMA
 	bool "Cirrus Logic EP93xx DMA support"
 	depends on ARCH_EP93XX || COMPILE_TEST

drivers/dma/Makefile

@@ -28,6 +28,7 @@ obj-$(CONFIG_DMA_OMAP) += omap-dma.o
 obj-$(CONFIG_DMA_SA11X0) += sa11x0-dma.o
 obj-$(CONFIG_DMA_SUN4I) += sun4i-dma.o
 obj-$(CONFIG_DMA_SUN6I) += sun6i-dma.o
+obj-$(CONFIG_DW_AXI_DMAC) += dw-axi-dmac/
 obj-$(CONFIG_DW_DMAC_CORE) += dw/
 obj-$(CONFIG_EP93XX_DMA) += ep93xx_dma.o
 obj-$(CONFIG_FSL_DMA) += fsldma.o

drivers/dma/dw-axi-dmac/Makefile

+obj-$(CONFIG_DW_AXI_DMAC) += dw-axi-dmac-platform.o