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dmaengine: PL08x: Add support for different maximum transfer size

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PL080S has separate register to store transfer size in, allowing single
transfer to be much larger than in standard PL080.

This patch makes the amba-pl08x driver aware of this and removes writing
transfer size to reserved bits of CH_CONTROL register on PL080S, which
was not a problem witn transfer sizes fitting the original bitfield
of PL080, but now would overwrite other fields.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Tomasz Figa 2013-08-11 19:59:18 +02:00 committed by Vinod Koul
parent da1b6c05b8
commit 5110e51d12
1 changed files with 7 additions and 1 deletions
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8
drivers/dma/amba-pl08x.c
View file

@ -115,6 +115,7 @@ struct vendor_data {
bool dualmaster;
bool nomadik;
bool pl080s;
u32 max_transfer_size;
};
/**
@ -783,6 +784,7 @@ static inline u32 pl08x_cctl_bits(u32 cctl, u8 srcwidth, u8 dstwidth,
break;
}
tsize &= PL080_CONTROL_TRANSFER_SIZE_MASK;
retbits |= tsize << PL080_CONTROL_TRANSFER_SIZE_SHIFT;
return retbits;
}
@ -1050,7 +1052,7 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
* MIN(buswidths)
*/
max_bytes_per_lli = bd.srcbus.buswidth *
PL080_CONTROL_TRANSFER_SIZE_MASK;
pl08x->vd->max_transfer_size;
dev_vdbg(&pl08x->adev->dev,
"%s max bytes per lli = %zu\n",
__func__, max_bytes_per_lli);
@ -2152,6 +2154,7 @@ static struct vendor_data vendor_pl080 = {
.config_offset = PL080_CH_CONFIG,
.channels = 8,
.dualmaster = true,
.max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK,
};
static struct vendor_data vendor_nomadik = {
@ -2159,18 +2162,21 @@ static struct vendor_data vendor_nomadik = {
.channels = 8,
.dualmaster = true,
.nomadik = true,
.max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK,
};
static struct vendor_data vendor_pl080s = {
.config_offset = PL080S_CH_CONFIG,
.channels = 8,
.pl080s = true,
.max_transfer_size = PL080S_CONTROL_TRANSFER_SIZE_MASK,
};
static struct vendor_data vendor_pl081 = {
.config_offset = PL080_CH_CONFIG,
.channels = 2,
.dualmaster = false,
.max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK,
};
static struct amba_id pl08x_ids[] = {