dmaengine: add TI EDMA DMA engine driver

Add a DMA engine driver for the TI EDMA controller. This driver
is implemented as a wrapper around the existing DaVinci private
DMA implementation. This approach allows for incremental conversion
of each peripheral driver to the DMA engine API. The EDMA driver
supports slave transfers but does not yet support cyclic transfers.

Signed-off-by: Matt Porter <mporter@ti.com>
Tested-by: Tom Rini <trini@ti.com>
Tested-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>

drivers/dma/Kconfig

@@ -208,6 +208,16 @@ config SIRF_DMA
 	help
 	  Enable support for the CSR SiRFprimaII DMA engine.
 
+config TI_EDMA
+	tristate "TI EDMA support"
+	depends on ARCH_DAVINCI
+	select DMA_ENGINE
+	select DMA_VIRTUAL_CHANNELS
+	default n
+	help
+	  Enable support for the TI EDMA controller. This DMA
+	  engine is found on TI DaVinci and AM33xx parts.
+
 config ARCH_HAS_ASYNC_TX_FIND_CHANNEL
 	bool
 

drivers/dma/Makefile

@@ -23,6 +23,7 @@ obj-$(CONFIG_IMX_DMA) += imx-dma.o
 obj-$(CONFIG_MXS_DMA) += mxs-dma.o
 obj-$(CONFIG_TIMB_DMA) += timb_dma.o
 obj-$(CONFIG_SIRF_DMA) += sirf-dma.o
+obj-$(CONFIG_TI_EDMA) += edma.o
 obj-$(CONFIG_STE_DMA40) += ste_dma40.o ste_dma40_ll.o
 obj-$(CONFIG_TEGRA20_APB_DMA) += tegra20-apb-dma.o
 obj-$(CONFIG_PL330_DMA) += pl330.o