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dmaengine: imx-sdma: add sdma_transfer_init to decrease code overlap 

There are lot of codes overlap between prep_sg and prep_cyclic function.
Add sdma_transfer_init() function to elimated the code overlap.

Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
Tested-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Robin Gong 2018-06-20 00:57:03 +08:00 committed by Vinod Koul
parent 36e8d3b133
commit 21420841a5
1 changed files with 37 additions and 46 deletions
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83
drivers/dma/imx-sdma.c
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@ -1248,6 +1248,40 @@ static void sdma_free_chan_resources(struct dma_chan *chan)
clk_disable(sdma->clk_ahb);
}
static struct sdma_desc *sdma_transfer_init(struct sdma_channel *sdmac,
enum dma_transfer_direction direction, u32 bds)
{
struct sdma_desc *desc;
desc = kzalloc((sizeof(*desc)), GFP_NOWAIT);
if (!desc)
goto err_out;
sdmac->status = DMA_IN_PROGRESS;
sdmac->direction = direction;
sdmac->flags = 0;
desc->chn_count = 0;
desc->chn_real_count = 0;
desc->buf_tail = 0;
desc->buf_ptail = 0;
desc->sdmac = sdmac;
desc->num_bd = bds;
if (sdma_alloc_bd(desc))
goto err_desc_out;
if (sdma_load_context(sdmac))
goto err_desc_out;
return desc;
err_desc_out:
kfree(desc);
err_out:
return NULL;
}
static struct dma_async_tx_descriptor *sdma_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
@ -1260,36 +1294,13 @@ static struct dma_async_tx_descriptor *sdma_prep_slave_sg(
struct scatterlist *sg;
struct sdma_desc *desc;
if (sdmac->status == DMA_IN_PROGRESS)
return NULL;
sdmac->status = DMA_IN_PROGRESS;
sdmac->flags = 0;
desc = kzalloc((sizeof(*desc)), GFP_NOWAIT);
desc = sdma_transfer_init(sdmac, direction, sg_len);
if (!desc)
goto err_out;
desc->buf_tail = 0;
desc->buf_ptail = 0;
desc->sdmac = sdmac;
desc->num_bd = sg_len;
desc->chn_real_count = 0;
if (sdma_alloc_bd(desc)) {
kfree(desc);
goto err_out;
}
dev_dbg(sdma->dev, "setting up %d entries for channel %d.\n",
sg_len, channel);
sdmac->direction = direction;
ret = sdma_load_context(sdmac);
if (ret)
goto err_bd_out;
desc->chn_count = 0;
for_each_sg(sgl, sg, sg_len, i) {
struct sdma_buffer_descriptor *bd = &desc->bd[i];
int param;
@ -1365,38 +1376,18 @@ static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic(
struct sdma_engine *sdma = sdmac->sdma;
int num_periods = buf_len / period_len;
int channel = sdmac->channel;
int ret, i = 0, buf = 0;
int i = 0, buf = 0;
struct sdma_desc *desc;
dev_dbg(sdma->dev, "%s channel: %d\n", __func__, channel);
if (sdmac->status == DMA_IN_PROGRESS)
return NULL;
sdmac->status = DMA_IN_PROGRESS;
desc = kzalloc((sizeof(*desc)), GFP_NOWAIT);
desc = sdma_transfer_init(sdmac, direction, num_periods);
if (!desc)
goto err_out;
desc->buf_tail = 0;
desc->buf_ptail = 0;
desc->sdmac = sdmac;
desc->num_bd = num_periods;
desc->chn_real_count = 0;
desc->period_len = period_len;
sdmac->flags |= IMX_DMA_SG_LOOP;
sdmac->direction = direction;
if (sdma_alloc_bd(desc)) {
kfree(desc);
goto err_bd_out;
}
ret = sdma_load_context(sdmac);
if (ret)
goto err_bd_out;
if (period_len > 0xffff) {
dev_err(sdma->dev, "SDMA channel %d: maximum period size exceeded: %zu > %d\n",