[PATCH 1/5] dmaengine: sprd: Define the DMA transfer step type

[Baolin Wang]

From: Eric Long <eric.l...@spreadtrum.com>

Define the DMA transfer step type to make code more readable.

Signed-off-by: Eric Long <eric.l...@spreadtrum.com>
Signed-off-by: Baolin Wang <baolin.w...@linaro.org>
---
 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