dmaengine: dw: provide DMA capabilities

The new DMAEngine requirement is to provide what the DMA controller can do,
such as directions, bus widths, and residue granularity. The patch sets those
properties for the DesignWare DMA controller driver.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index 4bc307745ef1a6018719850b2c017ce62f8daea4..fcb9a916e6f65c2c06bd9a051e5afd00e5caaa0c 100644 (file)
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -61,6 +61,13 @@
  */
 #define NR_DESCS_PER_CHANNEL   64
 
+/* The set of bus widths supported by the DMA controller */
+#define DW_DMA_BUSWIDTHS                         \
+       BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED)       | \
+       BIT(DMA_SLAVE_BUSWIDTH_1_BYTE)          | \
+       BIT(DMA_SLAVE_BUSWIDTH_2_BYTES)         | \
+       BIT(DMA_SLAVE_BUSWIDTH_4_BYTES)
+
 /*----------------------------------------------------------------------*/
 
 static struct device *chan2dev(struct dma_chan *chan)
@@ -1660,8 +1667,8 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
        dw->dma.device_free_chan_resources = dwc_free_chan_resources;
 
        dw->dma.device_prep_dma_memcpy = dwc_prep_dma_memcpy;
-
        dw->dma.device_prep_slave_sg = dwc_prep_slave_sg;
+
        dw->dma.device_config = dwc_config;
        dw->dma.device_pause = dwc_pause;
        dw->dma.device_resume = dwc_resume;
@@ -1670,6 +1677,13 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
        dw->dma.device_tx_status = dwc_tx_status;
        dw->dma.device_issue_pending = dwc_issue_pending;
 
+       /* DMA capabilities */
+       dw->dma.src_addr_widths = DW_DMA_BUSWIDTHS;
+       dw->dma.dst_addr_widths = DW_DMA_BUSWIDTHS;
+       dw->dma.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV) |
+                            BIT(DMA_MEM_TO_MEM);
+       dw->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
+
        err = dma_async_device_register(&dw->dma);
        if (err)
                goto err_dma_register;