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 --- drivers/dma/edma.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c index 604c7c94c731..1877319379fc 100644 --- a/drivers/dma/edma.c +++ b/drivers/dma/edma.c @@ -851,6 +851,23 @@ 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) { @@ -861,6 +878,7 @@ 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);