diff options
| author | Sam Van Den Berge <sam.van.den.berge@telenet.be> | 2016-09-22 20:51:15 +0200 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2016-09-26 23:13:04 +0530 |
| commit | 34681d84a0f7cc22ded1413dc79eef8a2f23d9c3 (patch) | |
| tree | 2813bf63617076fafc4e988d1b85a427986a8d85 /arch/arm/mach-s3c24xx | |
| parent | 360af35b08da9def3be8b67398f4e0f90c292e37 (diff) | |
dmaengine: s3c24xx: Add dma_slave_map for s3c2440 devices
This patch updates the s3c24xx dma driver to be able to pass a
dma_slave_map array via the platform data. This is needed to
be able to use the new, simpler dmaengine API [1].
I used the virtual DMA channels as a parameter for the dma_filter
function. By doing that, I could reuse the existing filter function in
drivers/dma/s3c24xx-dma.c.
I have tested this on my mini2440 board with the audio driver.
According to my observations, dma_request_slave_channel in the
function dmaengine_pcm_new in the file
sound/soc/soc-generic-dmaengine-pcm.c now returns a valid DMA channel
whereas before no DMA channel was returned at that point.
Entries for DMACH_XD0, DMACH_XD1 and DMACH_TIMER are missing because I
don't realy know which driver to use for these.
[1]
http://lists.infradead.org/pipermail/linux-arm-kernel/2015-December/393635.html
Signed-off-by: Sam Van Den Berge <sam.van.den.berge@telenet.be>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'arch/arm/mach-s3c24xx')
| -rw-r--r-- | arch/arm/mach-s3c24xx/common.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c24xx/common.c b/arch/arm/mach-s3c24xx/common.c index bf50328107bd..ba0ceebdd73d 100644 --- a/arch/arm/mach-s3c24xx/common.c +++ b/arch/arm/mach-s3c24xx/common.c @@ -33,6 +33,7 @@ #include <linux/delay.h> #include <linux/io.h> #include <linux/platform_data/dma-s3c24xx.h> +#include <linux/dmaengine.h> #include <mach/hardware.h> #include <mach/regs-clock.h> @@ -439,10 +440,44 @@ static struct s3c24xx_dma_channel s3c2440_dma_channels[DMACH_MAX] = { [DMACH_USB_EP4] = { S3C24XX_DMA_APB, true, S3C24XX_DMA_CHANREQ(4, 3), }, }; +static const struct dma_slave_map s3c2440_dma_slave_map[] = { + /* TODO: DMACH_XD0 */ + /* TODO: DMACH_XD1 */ + { "s3c2440-sdi", "rx-tx", (void *)DMACH_SDI }, + { "s3c2410-spi.0", "rx", (void *)DMACH_SPI0 }, + { "s3c2410-spi.0", "tx", (void *)DMACH_SPI0 }, + { "s3c2410-spi.1", "rx", (void *)DMACH_SPI1 }, + { "s3c2410-spi.1", "tx", (void *)DMACH_SPI1 }, + { "s3c2440-uart.0", "rx", (void *)DMACH_UART0 }, + { "s3c2440-uart.0", "tx", (void *)DMACH_UART0 }, + { "s3c2440-uart.1", "rx", (void *)DMACH_UART1 }, + { "s3c2440-uart.1", "tx", (void *)DMACH_UART1 }, + { "s3c2440-uart.2", "rx", (void *)DMACH_UART2 }, + { "s3c2440-uart.2", "tx", (void *)DMACH_UART2 }, + { "s3c2440-uart.3", "rx", (void *)DMACH_UART3 }, + { "s3c2440-uart.3", "tx", (void *)DMACH_UART3 }, + /* TODO: DMACH_TIMER */ + { "s3c24xx-iis", "rx", (void *)DMACH_I2S_IN }, + { "s3c24xx-iis", "tx", (void *)DMACH_I2S_OUT }, + { "samsung-ac97", "rx", (void *)DMACH_PCM_IN }, + { "samsung-ac97", "tx", (void *)DMACH_PCM_OUT }, + { "samsung-ac97", "rx", (void *)DMACH_MIC_IN }, + { "s3c-hsudc", "rx0", (void *)DMACH_USB_EP1 }, + { "s3c-hsudc", "rx1", (void *)DMACH_USB_EP2 }, + { "s3c-hsudc", "rx2", (void *)DMACH_USB_EP3 }, + { "s3c-hsudc", "rx3", (void *)DMACH_USB_EP4 }, + { "s3c-hsudc", "tx0", (void *)DMACH_USB_EP1 }, + { "s3c-hsudc", "tx1", (void *)DMACH_USB_EP2 }, + { "s3c-hsudc", "tx2", (void *)DMACH_USB_EP3 }, + { "s3c-hsudc", "tx3", (void *)DMACH_USB_EP4 } +}; + static struct s3c24xx_dma_platdata s3c2440_dma_platdata = { .num_phy_channels = 4, .channels = s3c2440_dma_channels, .num_channels = DMACH_MAX, + .slave_map = s3c2440_dma_slave_map, + .slavecnt = ARRAY_SIZE(s3c2440_dma_slave_map), }; struct platform_device s3c2440_device_dma = { |