spi/pxa2xx: add support for DMA engine

To be able to use DMA with this driver on non-PXA platforms we implement support for the generic DMA engine API. This lets user to use different DMA engines with little or no modification to the driver. Request lines and channel numbers can be passed to the driver from the platform specific data. The DMA engine implementation will be selected by default even on PXA platform. User can select the legacy DMA API by enabling Kconfig option CONFIG_SPI_PXA2XX_PXADMA. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Tested-by: Lu Cao <lucao@marvell.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
torvalds · Feb 8, 2013 · 5928808 · 5928808
1 parent cd7bed0
commit 5928808
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Showing 6 changed files with 437 additions and 3 deletions.
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
@@ -301,7 +301,12 @@ config SPI_PXA2XX_PXADMA
 	bool "PXA2xx SSP legacy PXA DMA API support"
 	depends on SPI_PXA2XX && ARCH_PXA
 	help
-	  Enable PXA private legacy DMA API support.
+	  Enable PXA private legacy DMA API support. Note that this is
+	  deprecated in favor of generic DMA engine API.
+
+config SPI_PXA2XX_DMA
+	def_bool y
+	depends on SPI_PXA2XX && !SPI_PXA2XX_PXADMA
 
 config SPI_PXA2XX
 	tristate "PXA2xx SSP SPI master"

diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
@@ -49,6 +49,7 @@ obj-$(CONFIG_SPI_PL022)			+= spi-pl022.o
 obj-$(CONFIG_SPI_PPC4xx)		+= spi-ppc4xx.o
 spi-pxa2xx-platform-objs		:= spi-pxa2xx.o
 spi-pxa2xx-platform-$(CONFIG_SPI_PXA2XX_PXADMA)	+= spi-pxa2xx-pxadma.o
+spi-pxa2xx-platform-$(CONFIG_SPI_PXA2XX_DMA)	+= spi-pxa2xx-dma.o
 obj-$(CONFIG_SPI_PXA2XX)		+= spi-pxa2xx-platform.o
 obj-$(CONFIG_SPI_PXA2XX_PCI)		+= spi-pxa2xx-pci.o
 obj-$(CONFIG_SPI_RSPI)			+= spi-rspi.o