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dw_dmac: store direction in the custom channel structure 

Currently the direction value comes from the generic slave configuration
structure and explicitly as a preparation function parameter. The first one is
kinda obsoleted. Thus, we have to store the value passed to the preparation
function somewhere in our structures to be able to use it later. The best
candidate to provide the storage is a custom channel structure. Until now we
still keep and check the direction field of the slave config structure 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 10:53:03 +02:00 committed by Vinod Koul
parent 01126856ff
commit 0fdb567fc7
2 changed files with 18 additions and 8 deletions
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12
drivers/dma/dw_dmac.c
View File

@ -178,9 +178,9 @@ static void dwc_initialize(struct dw_dma_chan *dwc)
cfghi = dws->cfg_hi;
cfglo |= dws->cfg_lo & ~DWC_CFGL_CH_PRIOR_MASK;
} else {
if (dwc->dma_sconfig.direction == DMA_MEM_TO_DEV)
if (dwc->direction == DMA_MEM_TO_DEV)
cfghi = DWC_CFGH_DST_PER(dwc->dma_sconfig.slave_id);
else if (dwc->dma_sconfig.direction == DMA_DEV_TO_MEM)
else if (dwc->direction == DMA_DEV_TO_MEM)
cfghi = DWC_CFGH_SRC_PER(dwc->dma_sconfig.slave_id);
}
@ -721,6 +721,8 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
return NULL;
}
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)]);
@ -805,6 +807,8 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
if (unlikely(!dws || !sg_len))
return NULL;
dwc->direction = direction;
prev = first = NULL;
switch (direction) {
@ -981,6 +985,7 @@ set_runtime_config(struct dma_chan *chan, struct dma_slave_config *sconfig)
return -EINVAL;
memcpy(&dwc->dma_sconfig, sconfig, sizeof(*sconfig));
dwc->direction = sconfig->direction;
convert_burst(&dwc->dma_sconfig.src_maxburst);
convert_burst(&dwc->dma_sconfig.dst_maxburst);
@ -1358,6 +1363,8 @@ struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
if (unlikely(!is_slave_direction(direction)))
goto out_err;
dwc->direction = direction;
if (direction == DMA_MEM_TO_DEV)
reg_width = __ffs(sconfig->dst_addr_width);
else
@ -1732,6 +1739,7 @@ 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 */
if (autocfg) {

14
drivers/dma/dw_dmac_regs.h
View File

@ -9,6 +9,7 @@
* published by the Free Software Foundation.
*/
#include <linux/dmaengine.h>
#include <linux/dw_dmac.h>
#define DW_DMA_MAX_NR_CHANNELS 8
@ -184,12 +185,13 @@ enum dw_dmac_flags {
};
struct dw_dma_chan {
struct dma_chan chan;
void __iomem *ch_regs;
u8 mask;
u8 priority;
bool paused;
bool initialized;
struct dma_chan chan;
void __iomem *ch_regs;
u8 mask;
u8 priority;
enum dma_transfer_direction direction;
bool paused;
bool initialized;
/* software emulation of the LLP transfers */
struct list_head *tx_list;