From 80b0e0abfbcf9897ee263a79bc4cbdcfeca72431 Mon Sep 17 00:00:00 2001 From: Peter Ujfalusi Date: Sat, 29 Mar 2014 19:03:30 +0530 Subject: [PATCH] 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 Acked-by: Tony Lindgren Signed-off-by: Vinod Koul --- drivers/dma/omap-dma.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) 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); -- 2.39.5