path: root/arch/arm/plat-samsung/dma-ops.c
diff options
authorThomas Abraham <thomas.abraham@linaro.org>2011-10-24 11:43:38 +0200
committerKukjin Kim <kgene.kim@samsung.com>2011-12-23 10:07:05 +0900
commit4972a80e16a206149729be887285f4494b6826dc (patch)
tree4d3e703f4337389c409098eceb767e3f44c31b87 /arch/arm/plat-samsung/dma-ops.c
parent93ed55441245a39e3935f5cf1af3e22febcce905 (diff)
ARM: SAMSUNG: Add device tree support for pl330 dma engine wrappers
A new dma request id 'DMACH_DT_PROP' is introduced for client drivers requesting a dma channel. This request indicates that a device tree node property represting the dma channel is available in 'struct samsung_dma_info'. The dma channel request wrapper uses the node property value as the value for the filter parameter. Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Diffstat (limited to 'arch/arm/plat-samsung/dma-ops.c')
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/arm/plat-samsung/dma-ops.c b/arch/arm/plat-samsung/dma-ops.c
index 889c2c22325..2cded872f22 100644
--- a/arch/arm/plat-samsung/dma-ops.c
+++ b/arch/arm/plat-samsung/dma-ops.c
@@ -24,11 +24,18 @@ static unsigned samsung_dmadev_request(enum dma_ch dma_ch,
struct dma_chan *chan;
dma_cap_mask_t mask;
struct dma_slave_config slave_config;
+ void *filter_param;
dma_cap_set(info->cap, mask);
- chan = dma_request_channel(mask, pl330_filter, (void *)dma_ch);
+ /*
+ * If a dma channel property of a device node from device tree is
+ * specified, use that as the fliter parameter.
+ */
+ filter_param = (dma_ch == DMACH_DT_PROP) ? (void *)info->dt_dmach_prop :
+ (void *)dma_ch;
+ chan = dma_request_channel(mask, pl330_filter, filter_param);
if (info->direction == DMA_FROM_DEVICE) {
memset(&slave_config, 0, sizeof(struct dma_slave_config));