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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2013-01-10 10:53:03 +0200
committerVinod Koul <vinod.koul@intel.com>2013-01-12 05:07:23 -0800
commit0fdb567fc72da906e230ce7e2aae2feba260a6be (patch)
tree6aa11e21c5e79b248100e439c5273326f0feb7ac /drivers/dma
parent01126856ff4f7d4cc5899c208fd4d3c7d0a2b83a (diff)
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>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/dw_dmac.c12
-rw-r--r--drivers/dma/dw_dmac_regs.h14
2 files changed, 18 insertions, 8 deletions
diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index e554027849b7..a2c5a60bc2e2 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -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) {
diff --git a/drivers/dma/dw_dmac_regs.h b/drivers/dma/dw_dmac_regs.h
index 8881e9b277a3..f9532c29b808 100644
--- a/drivers/dma/dw_dmac_regs.h
+++ b/drivers/dma/dw_dmac_regs.h
@@ -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;