diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-05-16 14:16:03 +0400 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-07-01 17:15:46 +0400 |
| commit | 9862ba17b7b6866cbee90547ff1f58d055c13f97 (patch) | |
| tree | 88b467e0fa3c0225cf068513b33cf2a30a639f44 /drivers/dma/amba-pl08x.c | |
| parent | 409ec8db46dc60e5da7169b6bac6b294513d386a (diff) | |
| download | linux-9862ba17b7b6866cbee90547ff1f58d055c13f97.tar.xz | |
dmaengine: PL08x: extract function to to generate cctl values
Extract the functionality from dma_slave_config to generate the cctl
values for a given bus width and burst size. This allows us to use
this elsewhere in the driver, namely the prepare functions.
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/dma/amba-pl08x.c')
| -rw-r--r-- | drivers/dma/amba-pl08x.c | 53 |
1 files changed, 32 insertions, 21 deletions
diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c index bd51a44746be..fde801f787cd 100644 --- a/drivers/dma/amba-pl08x.c +++ b/drivers/dma/amba-pl08x.c @@ -1207,14 +1207,40 @@ static u32 pl08x_burst(u32 maxburst) return burst_sizes[i].reg; } +static u32 pl08x_get_cctl(struct pl08x_dma_chan *plchan, + enum dma_slave_buswidth addr_width, u32 maxburst) +{ + u32 width, burst, cctl = 0; + + width = pl08x_width(addr_width); + if (width == ~0) + return ~0; + + cctl |= width << PL080_CONTROL_SWIDTH_SHIFT; + cctl |= width << PL080_CONTROL_DWIDTH_SHIFT; + + /* + * If this channel will only request single transfers, set this + * down to ONE element. Also select one element if no maxburst + * is specified. + */ + if (plchan->cd->single) + maxburst = 1; + + burst = pl08x_burst(maxburst); + cctl |= burst << PL080_CONTROL_SB_SIZE_SHIFT; + cctl |= burst << PL080_CONTROL_DB_SIZE_SHIFT; + + return pl08x_cctl(cctl); +} + 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 width, burst, maxburst; - u32 cctl = 0; + u32 maxburst, cctl = 0; if (!plchan->slave) return -EINVAL; @@ -1233,8 +1259,8 @@ static int dma_set_runtime_config(struct dma_chan *chan, return -EINVAL; } - width = pl08x_width(addr_width); - if (width == ~0) { + cctl = pl08x_get_cctl(plchan, addr_width, maxburst); + if (cctl == ~0) { dev_err(&pl08x->adev->dev, "bad runtime_config: alien address width\n"); return -EINVAL; @@ -1242,25 +1268,10 @@ static int dma_set_runtime_config(struct dma_chan *chan, plchan->cfg = *config; - cctl |= width << PL080_CONTROL_SWIDTH_SHIFT; - cctl |= width << PL080_CONTROL_DWIDTH_SHIFT; - - /* - * If this channel will only request single transfers, set this - * down to ONE element. Also select one element if no maxburst - * is specified. - */ - if (plchan->cd->single) - maxburst = 1; - - burst = pl08x_burst(maxburst); - cctl |= burst << PL080_CONTROL_SB_SIZE_SHIFT; - cctl |= burst << PL080_CONTROL_DB_SIZE_SHIFT; - if (plchan->runtime_direction == DMA_DEV_TO_MEM) { - plchan->src_cctl = pl08x_cctl(cctl); + plchan->src_cctl = cctl; } else { - plchan->dst_cctl = pl08x_cctl(cctl); + plchan->dst_cctl = cctl; } dev_dbg(&pl08x->adev->dev, |