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dw_dmac: backlink to dw_dma in dw_dma_chan is superfluous

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The same information could be extracted from the struct dma_chan.
The patch introduces helper function dwc_get_data_width() as well.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Andy Shevchenko 2013-01-10 10:53:05 +02:00 committed by Vinod Koul
parent 495aea4b57
commit 23d5f4ec9d
2 changed files with 20 additions and 10 deletions
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27
drivers/dma/dw_dmac.c
View File

@ -73,6 +73,22 @@ static inline unsigned int dwc_get_sms(struct dw_dma_slave *slave)
*/
#define NR_DESCS_PER_CHANNEL 64
#define SRC_MASTER 0
#define DST_MASTER 1
static inline unsigned int dwc_get_data_width(struct dma_chan *chan, int master)
{
struct dw_dma *dw = to_dw_dma(chan->device);
struct dw_dma_slave *dws = chan->private;
if (master == SRC_MASTER)
return dw->data_width[dwc_get_sms(dws)];
else if (master == DST_MASTER)
return dw->data_width[dwc_get_dms(dws)];
return 0;
}
/*----------------------------------------------------------------------*/
/*
@ -701,7 +717,6 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long flags)
{
struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
struct dw_dma_slave *dws = chan->private;
struct dw_desc *desc;
struct dw_desc *first;
struct dw_desc *prev;
@ -724,8 +739,8 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
dwc->direction = DMA_MEM_TO_MEM;
data_width = min_t(unsigned int, dwc->dw->data_width[dwc_get_sms(dws)],
dwc->dw->data_width[dwc_get_dms(dws)]);
data_width = min_t(unsigned int, dwc_get_data_width(chan, SRC_MASTER),
dwc_get_data_width(chan, DST_MASTER));
src_width = dst_width = min_t(unsigned int, data_width,
dwc_fast_fls(src | dest | len));
@ -790,7 +805,6 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned long flags, void *context)
{
struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
struct dw_dma_slave *dws = chan->private;
struct dma_slave_config *sconfig = &dwc->dma_sconfig;
struct dw_desc *prev;
struct dw_desc *first;
@ -824,7 +838,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
ctllo |= sconfig->device_fc ? DWC_CTLL_FC(DW_DMA_FC_P_M2P) :
DWC_CTLL_FC(DW_DMA_FC_D_M2P);
data_width = dwc->dw->data_width[dwc_get_sms(dws)];
data_width = dwc_get_data_width(chan, SRC_MASTER);
for_each_sg(sgl, sg, sg_len, i) {
struct dw_desc *desc;
@ -887,7 +901,7 @@ slave_sg_todev_fill_desc:
ctllo |= sconfig->device_fc ? DWC_CTLL_FC(DW_DMA_FC_P_P2M) :
DWC_CTLL_FC(DW_DMA_FC_D_P2M);
data_width = dwc->dw->data_width[dwc_get_dms(dws)];
data_width = dwc_get_data_width(chan, DST_MASTER);
for_each_sg(sgl, sg, sg_len, i) {
struct dw_desc *desc;
@ -1739,7 +1753,6 @@ static int dw_probe(struct platform_device *pdev)
channel_clear_bit(dw, CH_EN, dwc->mask);
dwc->dw = dw;
dwc->direction = DMA_TRANS_NONE;
/* hardware configuration */

3
drivers/dma/dw_dmac_regs.h
View File

@ -214,9 +214,6 @@ struct dw_dma_chan {
/* configuration passed via DMA_SLAVE_CONFIG */
struct dma_slave_config dma_sconfig;
/* backlink to dw_dma */
struct dw_dma *dw;
};
static inline struct dw_dma_chan_regs __iomem *