diff options
| author | Mika Westerberg <mika.westerberg@iki.fi> | 2011-05-29 13:10:06 +0300 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2011-06-06 12:07:08 +0530 |
| commit | d41071575b0b20b780bb0e8e7e70c62c1b07a883 (patch) | |
| tree | a4b4a897e18cc7e2ad0a2f0676cfb8bf6b0de463 /arch | |
| parent | 8e4a93008db7780e45838fe65840b289f389ef4a (diff) | |
| download | blackbird-op-linux-d41071575b0b20b780bb0e8e7e70c62c1b07a883.tar.gz blackbird-op-linux-d41071575b0b20b780bb0e8e7e70c62c1b07a883.zip | |
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>
Cc: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-ep93xx/core.c | 6 | ||||
| -rw-r--r-- | arch/arm/mach-ep93xx/include/mach/ep93xx_spi.h | 2 |
2 files changed, 7 insertions, 1 deletions
diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c index 82079545adc4..cc9f1d4b104d 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 0a37961b3453..9bb63ac13f04 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; }; /** |
