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authorRussell King - ARM Linux <linux@arm.linux.org.uk>2011-07-21 17:12:27 +0100
committerVinod Koul <vinod.koul@intel.com>2011-07-26 15:33:28 +0530
commitb207b4d02beb06059478339bbe4672ba715605d6 (patch)
tree3f62c4e2854d4dce26c4ff3491f1d2d47b558c87 /drivers/dma
parentfc74eb791590e624ca6915ae76a04808e03bffb0 (diff)
downloadop-kernel-dev-b207b4d02beb06059478339bbe4672ba715605d6.zip
op-kernel-dev-b207b4d02beb06059478339bbe4672ba715605d6.tar.gz
DMA: PL08x: separately store source/destination slave address
Store the source/destination slave address separately into the channel structure. This moves us towards being able to avoid a configuration call each time we use the channel. Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/amba-pl08x.c21
1 files changed, 9 insertions, 12 deletions
diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
index 1c641bf..077ddee 100644
--- a/drivers/dma/amba-pl08x.c
+++ b/drivers/dma/amba-pl08x.c
@@ -1102,7 +1102,6 @@ static int dma_set_runtime_config(struct dma_chan *chan,
struct pl08x_driver_data *pl08x = plchan->host;
struct pl08x_channel_data *cd = plchan->cd;
enum dma_slave_buswidth addr_width;
- dma_addr_t addr;
u32 maxburst;
u32 cctl = 0;
int i;
@@ -1113,11 +1112,9 @@ static int dma_set_runtime_config(struct dma_chan *chan,
/* Transfer direction */
plchan->runtime_direction = config->direction;
if (config->direction == DMA_TO_DEVICE) {
- addr = config->dst_addr;
addr_width = config->dst_addr_width;
maxburst = config->dst_maxburst;
} else if (config->direction == DMA_FROM_DEVICE) {
- addr = config->src_addr;
addr_width = config->src_addr_width;
maxburst = config->src_maxburst;
} else {
@@ -1161,7 +1158,11 @@ static int dma_set_runtime_config(struct dma_chan *chan,
cctl |= burst_sizes[i].reg;
}
- plchan->runtime_addr = addr;
+ if (plchan->runtime_direction == DMA_FROM_DEVICE) {
+ plchan->src_addr = config->src_addr;
+ } else {
+ plchan->dst_addr = config->dst_addr;
+ }
/* Modify the default channel data to fit PrimeCell request */
cd->cctl = cctl;
@@ -1396,19 +1397,13 @@ static struct dma_async_tx_descriptor *pl08x_prep_slave_sg(
txd->ccfg |= PL080_FLOW_MEM2PER << PL080_CONFIG_FLOW_CONTROL_SHIFT;
txd->cctl |= PL080_CONTROL_SRC_INCR;
txd->src_addr = sgl->dma_address;
- if (plchan->runtime_addr)
- txd->dst_addr = plchan->runtime_addr;
- else
- txd->dst_addr = plchan->cd->addr;
+ txd->dst_addr = plchan->dst_addr;
src_buses = pl08x->mem_buses;
dst_buses = plchan->cd->periph_buses;
} else if (direction == DMA_FROM_DEVICE) {
txd->ccfg |= PL080_FLOW_PER2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT;
txd->cctl |= PL080_CONTROL_DST_INCR;
- if (plchan->runtime_addr)
- txd->src_addr = plchan->runtime_addr;
- else
- txd->src_addr = plchan->cd->addr;
+ txd->src_addr = plchan->src_addr;
txd->dst_addr = sgl->dma_address;
src_buses = plchan->cd->periph_buses;
dst_buses = pl08x->mem_buses;
@@ -1704,6 +1699,8 @@ static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x,
chan->slave = true;
chan->name = pl08x->pd->slave_channels[i].bus_id;
chan->cd = &pl08x->pd->slave_channels[i];
+ chan->src_addr = chan->cd->addr;
+ chan->dst_addr = chan->cd->addr;
} else {
chan->cd = &pl08x->pd->memcpy_channel;
chan->name = kasprintf(GFP_KERNEL, "memcpy%d", i);
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