dmaengine: edma: 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: Joel Fernandes <joelf@ti.com>
Reviewed-and-Tested-by: Joel Fernandes <joelf@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index 5c24b60242782bd2c9f4c11a5a0d1cd3a6fbd7c0..ce230f8f6d981114dd1add8d04120690c31f1550 100644 (file)
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -853,6 +853,23 @@ static void __init edma_chan_init(struct edma_cc *ecc,
        }
 }
 
+#define EDMA_DMA_BUSWIDTHS     (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
+                                BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
+                                BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
+
+static int edma_dma_device_slave_caps(struct dma_chan *dchan,
+                                     struct dma_slave_caps *caps)
+{
+       caps->src_addr_widths = EDMA_DMA_BUSWIDTHS;
+       caps->dstn_addr_widths = EDMA_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_DESCRIPTOR;
+
+       return 0;
+}
+
 static void edma_dma_init(struct edma_cc *ecc, struct dma_device *dma,
                          struct device *dev)
 {
@@ -863,6 +880,7 @@ static void edma_dma_init(struct edma_cc *ecc, struct dma_device *dma,
        dma->device_issue_pending = edma_issue_pending;
        dma->device_tx_status = edma_tx_status;
        dma->device_control = edma_control;
+       dma->device_slave_caps = edma_dma_device_slave_caps;
        dma->dev = dev;
 
        INIT_LIST_HEAD(&dma->channels);