[linux-yocto] [PATCH 32/34] dmaengine: dw: provide DMA capabilities

[wei.tee.ng at intel.com]

From: Andy Shevchenko <andriy.shevchenko at linux.intel.com>

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 at linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul at intel.com>
(cherry picked from commit 029a40e97d0db269f4a7fc02b0f29f627f628309)

Signed-off-by: Ng Wei Tee <wei.tee.ng at intel.com>
---
 drivers/dma/dw/core.c |   16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index e536310..5034e0f 100644
--- 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)
@@ -1659,8 +1666,8 @@ 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;
@@ -1669,6 +1676,13 @@ 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;
-- 
1.7.9.5