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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>
This commit is contained in:
Russell King - ARM Linux 2011-07-21 17:12:27 +01:00 committed by Vinod Koul
parent fc74eb7915
commit b207b4d02b
2 changed files with 11 additions and 13 deletions
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21
drivers/dma/amba-pl08x.c
View File

@ -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);

3
include/linux/amba/pl08x.h
View File

@ -173,7 +173,8 @@ struct pl08x_dma_chan {
struct tasklet_struct tasklet;
char *name;
struct pl08x_channel_data *cd;
dma_addr_t runtime_addr;
dma_addr_t src_addr;
dma_addr_t dst_addr;
enum dma_data_direction runtime_direction;
dma_cookie_t lc;
struct list_head pend_list;