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dmaengine: sprd: Get transfer residue depending on the transfer direction

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Add one field to save the transfer direction for struct sprd_dma_desc,
which is used to get correct transfer residue depending on the transfer
direction.

[Baolin Wang adds one field to present the transfer direction]
Signed-off-by: Eric Long <eric.long@spreadtrum.com>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Eric Long 2018-11-06 13:01:32 +08:00 committed by Vinod Koul
parent a0ecabf503
commit d762ab33cc
1 changed files with 20 additions and 1 deletions
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21
drivers/dma/sprd-dma.c
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@ -159,6 +159,7 @@ struct sprd_dma_chn_hw {
struct sprd_dma_desc {
struct virt_dma_desc vd;
struct sprd_dma_chn_hw chn_hw;
enum dma_transfer_direction dir;
};
/* dma channel description */
@ -331,6 +332,17 @@ static void sprd_dma_stop_and_disable(struct sprd_dma_chn *schan)
sprd_dma_disable_chn(schan);
}
static unsigned long sprd_dma_get_src_addr(struct sprd_dma_chn *schan)
{
unsigned long addr, addr_high;
addr = readl(schan->chn_base + SPRD_DMA_CHN_SRC_ADDR);
addr_high = readl(schan->chn_base + SPRD_DMA_CHN_WARP_PTR) &
SPRD_DMA_HIGH_ADDR_MASK;
return addr | (addr_high << SPRD_DMA_HIGH_ADDR_OFFSET);
}
static unsigned long sprd_dma_get_dst_addr(struct sprd_dma_chn *schan)
{
unsigned long addr, addr_high;
@ -534,7 +546,12 @@ static enum dma_status sprd_dma_tx_status(struct dma_chan *chan,
else
pos = 0;
} else if (schan->cur_desc && schan->cur_desc->vd.tx.cookie == cookie) {
pos = sprd_dma_get_dst_addr(schan);
struct sprd_dma_desc *sdesc = to_sprd_dma_desc(vd);
if (sdesc->dir == DMA_DEV_TO_MEM)
pos = sprd_dma_get_dst_addr(schan);
else
pos = sprd_dma_get_src_addr(schan);
} else {
pos = 0;
}
@ -804,6 +821,8 @@ sprd_dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
if (!sdesc)
return NULL;
sdesc->dir = dir;
for_each_sg(sgl, sg, sglen, i) {
len = sg_dma_len(sg);