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>

diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index 362e7c4..928a0fa 100644 (file)
--- 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);