aboutsummaryrefslogtreecommitdiff
path: root/drivers/dma/dw_dmac.c
diff options
context:
space:
mode:
authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2012-09-21 15:05:48 +0300
committerVinod Koul <vinod.koul@linux.intel.com>2012-09-27 15:35:23 +0530
commita09820043c9e11149145a1ec221eed4a7b42dcce (patch)
tree0561b70b0803aec4b57e41e90fa0ece433f9d59f /drivers/dma/dw_dmac.c
parent4a63a8b3e8d2e4f56174deb728085010aa3ac2a1 (diff)
downloadlinux-a09820043c9e11149145a1ec221eed4a7b42dcce.tar.gz
dw_dmac: autoconfigure data_width or get it via platform data
Not all of the controllers support the 64 bit data width. Make it configurable via platform data. The driver will try to get a value from the component parameters, otherwise it will use the platform data. 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@linux.intel.com>
Diffstat (limited to 'drivers/dma/dw_dmac.c')
-rw-r--r--drivers/dma/dw_dmac.c46
1 files changed, 40 insertions, 6 deletions
diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index c143b7e4071..cdc0a1fe2c6 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -36,12 +36,22 @@
* which does not support descriptor writeback.
*/
+static inline unsigned int dwc_get_dms(struct dw_dma_slave *slave)
+{
+ return slave ? slave->dst_master : 0;
+}
+
+static inline unsigned int dwc_get_sms(struct dw_dma_slave *slave)
+{
+ return slave ? slave->src_master : 1;
+}
+
#define DWC_DEFAULT_CTLLO(_chan) ({ \
struct dw_dma_slave *__slave = (_chan->private); \
struct dw_dma_chan *_dwc = to_dw_dma_chan(_chan); \
struct dma_slave_config *_sconfig = &_dwc->dma_sconfig; \
- int _dms = __slave ? __slave->dst_master : 0; \
- int _sms = __slave ? __slave->src_master : 1; \
+ int _dms = dwc_get_dms(__slave); \
+ int _sms = dwc_get_sms(__slave); \
u8 _smsize = __slave ? _sconfig->src_maxburst : \
DW_DMA_MSIZE_16; \
u8 _dmsize = __slave ? _sconfig->dst_maxburst : \
@@ -631,6 +641,7 @@ 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;
@@ -650,7 +661,11 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
return NULL;
}
- src_width = dst_width = dwc_fast_fls(src | dest | len);
+ src_width = min_t(unsigned int, dwc->dw->data_width[dwc_get_sms(dws)],
+ dwc_fast_fls(src | len));
+
+ dst_width = min_t(unsigned int, dwc->dw->data_width[dwc_get_dms(dws)],
+ dwc_fast_fls(dest | len));
ctllo = DWC_DEFAULT_CTLLO(chan)
| DWC_CTLL_DST_WIDTH(dst_width)
@@ -720,6 +735,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
dma_addr_t reg;
unsigned int reg_width;
unsigned int mem_width;
+ unsigned int data_width;
unsigned int i;
struct scatterlist *sg;
size_t total_len = 0;
@@ -743,6 +759,8 @@ 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)];
+
for_each_sg(sgl, sg, sg_len, i) {
struct dw_desc *desc;
u32 len, dlen, mem;
@@ -750,7 +768,8 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
mem = sg_dma_address(sg);
len = sg_dma_len(sg);
- mem_width = dwc_fast_fls(mem | len);
+ mem_width = min_t(unsigned int,
+ data_width, dwc_fast_fls(mem | len));
slave_sg_todev_fill_desc:
desc = dwc_desc_get(dwc);
@@ -803,6 +822,8 @@ 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)];
+
for_each_sg(sgl, sg, sg_len, i) {
struct dw_desc *desc;
u32 len, dlen, mem;
@@ -810,7 +831,8 @@ slave_sg_todev_fill_desc:
mem = sg_dma_address(sg);
len = sg_dma_len(sg);
- mem_width = dwc_fast_fls(mem | len);
+ mem_width = min_t(unsigned int,
+ data_width, dwc_fast_fls(mem | len));
slave_sg_fromdev_fill_desc:
desc = dwc_desc_get(dwc);
@@ -1415,9 +1437,19 @@ static int __devinit dw_probe(struct platform_device *pdev)
dw->regs = regs;
/* get hardware configuration parameters */
- if (autocfg)
+ if (autocfg) {
max_blk_size = dma_readl(dw, MAX_BLK_SIZE);
+ dw->nr_masters = (dw_params >> DW_PARAMS_NR_MASTER & 3) + 1;
+ for (i = 0; i < dw->nr_masters; i++) {
+ dw->data_width[i] =
+ (dw_params >> DW_PARAMS_DATA_WIDTH(i) & 3) + 2;
+ }
+ } else {
+ dw->nr_masters = pdata->nr_masters;
+ memcpy(dw->data_width, pdata->data_width, 4);
+ }
+
/* Calculate all channel mask before DMA setup */
dw->all_chan_mask = (1 << nr_channels) - 1;
@@ -1464,6 +1496,8 @@ static int __devinit dw_probe(struct platform_device *pdev)
channel_clear_bit(dw, CH_EN, dwc->mask);
+ dwc->dw = dw;
+
/* hardware configuration */
if (autocfg)
/* Decode maximum block size for given channel. The