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authorMika Westerberg <mika.westerberg@iki.fi>2011-05-29 13:10:06 +0300
committerGrant Likely <grant.likely@secretlab.ca>2011-06-08 15:46:12 -0600
commit626a96db11698119a67eeda130488e869aa6f14e (patch)
tree1d5fd7da4a7919596bd81e0136d96679196e1152 /arch/arm/mach-ep93xx
parent71cebd700257a4f644066631bf02187d8f67817e (diff)
spi/ep93xx: add DMA support
This patch adds DMA support for the EP93xx SPI driver. By default the DMA is not enabled but it can be enabled by setting ep93xx_spi_info.use_dma to true in board configuration file. Note that the SPI driver still uses PIO for small transfers (<= 8 bytes) for performance reasons. Signed-off-by: Mika Westerberg <mika.westerberg@iki.fi> Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com> Acked-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'arch/arm/mach-ep93xx')
-rw-r--r--arch/arm/mach-ep93xx/core.c6
-rw-r--r--arch/arm/mach-ep93xx/include/mach/ep93xx_spi.h2
2 files changed, 7 insertions, 1 deletions
diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
index 82079545adc..cc9f1d4b104 100644
--- a/arch/arm/mach-ep93xx/core.c
+++ b/arch/arm/mach-ep93xx/core.c
@@ -488,11 +488,15 @@ static struct resource ep93xx_spi_resources[] = {
},
};
+static u64 ep93xx_spi_dma_mask = DMA_BIT_MASK(32);
+
static struct platform_device ep93xx_spi_device = {
.name = "ep93xx-spi",
.id = 0,
.dev = {
- .platform_data = &ep93xx_spi_master_data,
+ .platform_data = &ep93xx_spi_master_data,
+ .coherent_dma_mask = DMA_BIT_MASK(32),
+ .dma_mask = &ep93xx_spi_dma_mask,
},
.num_resources = ARRAY_SIZE(ep93xx_spi_resources),
.resource = ep93xx_spi_resources,
diff --git a/arch/arm/mach-ep93xx/include/mach/ep93xx_spi.h b/arch/arm/mach-ep93xx/include/mach/ep93xx_spi.h
index 0a37961b345..9bb63ac13f0 100644
--- a/arch/arm/mach-ep93xx/include/mach/ep93xx_spi.h
+++ b/arch/arm/mach-ep93xx/include/mach/ep93xx_spi.h
@@ -7,9 +7,11 @@ struct spi_device;
* struct ep93xx_spi_info - EP93xx specific SPI descriptor
* @num_chipselect: number of chip selects on this board, must be
* at least one
+ * @use_dma: use DMA for the transfers
*/
struct ep93xx_spi_info {
int num_chipselect;
+ bool use_dma;
};
/**