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DMA: PL08x: cleanup selection of buswidth 

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 17:13:28 +01:00 committed by Vinod Koul
parent fa020e7d04
commit aa88cdaa14
1 changed files with 19 additions and 15 deletions
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34
drivers/dma/amba-pl08x.c
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@ -1105,13 +1105,26 @@ static u32 pl08x_cctl(u32 cctl)
return cctl | PL080_CONTROL_PROT_SYS;
}
static u32 pl08x_width(enum dma_slave_buswidth width)
{
switch (width) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
return PL080_WIDTH_8BIT;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
return PL080_WIDTH_16BIT;
case DMA_SLAVE_BUSWIDTH_4_BYTES:
return PL080_WIDTH_32BIT;
}
return ~0;
}
static int dma_set_runtime_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
struct pl08x_driver_data *pl08x = plchan->host;
enum dma_slave_buswidth addr_width;
u32 maxburst;
u32 width, maxburst;
u32 cctl = 0;
int i;
@ -1132,25 +1145,16 @@ static int dma_set_runtime_config(struct dma_chan *chan,
return -EINVAL;
}
switch (addr_width) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
cctl |= (PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT) |
(PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT);
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
cctl |= (PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT) |
(PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT);
break;
case DMA_SLAVE_BUSWIDTH_4_BYTES:
cctl |= (PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT) |
(PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT);
break;
default:
width = pl08x_width(addr_width);
if (width == ~0) {
dev_err(&pl08x->adev->dev,
"bad runtime_config: alien address width\n");
return -EINVAL;
}
cctl |= width << PL080_CONTROL_SWIDTH_SHIFT;
cctl |= width << PL080_CONTROL_DWIDTH_SHIFT;
/*
* Now decide on a maxburst:
* If this channel will only request single transfers, set this