Skip to content

Commit

Permalink
dmaengine: dw: provide DMA capabilities
Browse files Browse the repository at this point in the history
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>
  • Loading branch information
andy-shev authored and Vinod Koul committed Jan 13, 2015
1 parent 3c20ba5 commit 029a40e
Showing 1 changed file with 15 additions and 1 deletion.
16 changes: 15 additions & 1 deletion drivers/dma/dw/core.c
Original file line number Diff line number Diff line change
Expand Up @@ -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)
Expand Down Expand Up @@ -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;
Expand All @@ -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;
Expand Down

0 comments on commit 029a40e

Please sign in to comment.