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authorPeter Ujfalusi <peter.ujfalusi@ti.com>2014-03-29 17:33:30 +0400
committerVinod Koul <vinod.koul@intel.com>2014-03-29 17:33:30 +0400
commit80b0e0abfbcf9897ee263a79bc4cbdcfeca72431 (patch)
tree98d9a33911b0ae054b52848da9c065cd08d16a52 /drivers/dma/omap-dma.c
parent4501fe61b286e35be5b372a4f1ffcf5881ceeaed (diff)
downloadlinux-80b0e0abfbcf9897ee263a79bc4cbdcfeca72431.tar.xz
dma: omap-dma: Implement device_slave_caps callback
With the callback implemented omap-dma can provide information to client drivers regarding to supported address widths, directions, residue granularity, etc. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/omap-dma.c')
-rw-r--r--drivers/dma/omap-dma.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index 362e7c49f2e1..928a0fa39f89 100644
--- a/drivers/dma/omap-dma.c
+++ b/drivers/dma/omap-dma.c
@@ -597,6 +597,23 @@ static void omap_dma_free(struct omap_dmadev *od)
kfree(od);
}
+#define OMAP_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
+ BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
+ BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
+
+static int omap_dma_device_slave_caps(struct dma_chan *dchan,
+ struct dma_slave_caps *caps)
+{
+ caps->src_addr_widths = OMAP_DMA_BUSWIDTHS;
+ caps->dstn_addr_widths = OMAP_DMA_BUSWIDTHS;
+ caps->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
+ caps->cmd_pause = true;
+ caps->cmd_terminate = true;
+ caps->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
+
+ return 0;
+}
+
static int omap_dma_probe(struct platform_device *pdev)
{
struct omap_dmadev *od;
@@ -615,6 +632,7 @@ static int omap_dma_probe(struct platform_device *pdev)
od->ddev.device_prep_slave_sg = omap_dma_prep_slave_sg;
od->ddev.device_prep_dma_cyclic = omap_dma_prep_dma_cyclic;
od->ddev.device_control = omap_dma_control;
+ od->ddev.device_slave_caps = omap_dma_device_slave_caps;
od->ddev.dev = &pdev->dev;
INIT_LIST_HEAD(&od->ddev.channels);
INIT_LIST_HEAD(&od->pending);