diff options
author | Robin Gong <yibin.gong@nxp.com> | 2018-06-20 00:57:03 +0800 |
---|---|---|
committer | Vinod Koul <vkoul@kernel.org> | 2018-07-02 18:24:47 +0530 |
commit | 21420841a554dae8a193cd3454ba91d913cfc320 (patch) | |
tree | 1140a0c39774cfe8449b4f61fef97fa92bee2e1a /drivers | |
parent | 36e8d3b133e16eb2aee8a53b9ed5cd34821f6123 (diff) |
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>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/dma/imx-sdma.c | 83 |
1 files changed, 37 insertions, 46 deletions
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index 9f1a4621fd9a..f8becafd7083 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -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", |