From: Eric Long <eric.long@xxxxxxxxxxxxxx>
Define the DMA transfer step type to make code more readable.
Signed-off-by: Eric Long <eric.long@xxxxxxxxxxxxxx>
Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxx>
---
drivers/dma/sprd-dma.c | 28 ++++++++++++++++++++++------
1 file changed, 22 insertions(+), 6 deletions(-)
diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index b106e8a..af9c156 100644
--- a/drivers/dma/sprd-dma.c
+++ b/drivers/dma/sprd-dma.c
@@ -169,6 +169,22 @@ enum sprd_dma_int_type {
SPRD_DMA_CFGERR_INT,
};
+/*
+ * enum sprd_dma_step: define the DMA transfer step type
+ * @SPRD_DMA_NONE_STEP: transfer do not need step
+ * @SPRD_DMA_BYTE_STEP: transfer step is one byte
+ * @SPRD_DMA_SHORT_STEP: transfer step is two bytes
+ * @SPRD_DMA_WORD_STEP: transfer step is one word
+ * @SPRD_DMA_DWORD_STEP: transfer step is double word
+ */
+enum sprd_dma_step {
+ SPRD_DMA_NONE_STEP,
+ SPRD_DMA_BYTE_STEP = BIT(0),
+ SPRD_DMA_SHORT_STEP = BIT(1),
+ SPRD_DMA_WORD_STEP = BIT(2),
+ SPRD_DMA_DWORD_STEP = BIT(3),
+};
+
/* dma channel hardware configuration */
struct sprd_dma_chn_hw {
u32 pause;
@@ -598,16 +614,16 @@ static int sprd_dma_config(struct dma_chan *chan, struct sprd_dma_desc *sdesc,
if (IS_ALIGNED(len, 4)) {
datawidth = 2;
- src_step = 4;
- des_step = 4;
+ src_step = SPRD_DMA_WORD_STEP;
+ des_step = SPRD_DMA_WORD_STEP;
} else if (IS_ALIGNED(len, 2)) {
datawidth = 1;
- src_step = 2;
- des_step = 2;
+ src_step = SPRD_DMA_SHORT_STEP;
+ des_step = SPRD_DMA_SHORT_STEP;
} else {
datawidth = 0;
- src_step = 1;
- des_step = 1;
+ src_step = SPRD_DMA_BYTE_STEP;
+ des_step = SPRD_DMA_BYTE_STEP;
}
fragment_len = SPRD_DMA_MEMCPY_MIN_SIZE;
--
1.7.9.5
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