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.f...@gmail.com>
---
drivers/dma/amba-pl08x.c | 22 ++++++++++++++++++----
1 file changed, 18 insertions(+), 4 deletions(-)
diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
index d1f1333..eb10eb8 100644
--- a/drivers/dma/amba-pl08x.c
+++ b/drivers/dma/amba-pl08x.c
@@ -112,6 +112,7 @@ struct vendor_data {
u8 config_offset;
u8 channels;
u32 flags;
+ u32 max_transfer_size;
};
/*
@@ -843,7 +844,10 @@ static inline void prep_byte_width_lli(struct
pl08x_driver_data *pl08x,
struct pl08x_lli_build_data *bd,
u32 *cctl, u32 len, int num_llis, size_t *total_bytes)
{
- *cctl = pl08x_cctl_bits(*cctl, 1, 1, len);
+ if (pl08x->vd->flags & PL08X_IS_PL080S)
+ *cctl = pl08x_cctl_bits(*cctl, 1, 1, 0);
+ else
+ *cctl = pl08x_cctl_bits(*cctl, 1, 1, len);
pl08x_fill_lli_for_desc(bd, num_llis, len, *cctl, len);
(*total_bytes) += len;
}
@@ -992,7 +996,7 @@ 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);
@@ -1025,8 +1029,14 @@ static int pl08x_fill_llis_for_desc(struct
pl08x_driver_data *pl08x,
"size 0x%08zx (remainder 0x%08zx)\n",
__func__, lli_len, bd.remainder);
- cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth,
- bd.dstbus.buswidth, tsize);
+ if (pl08x->vd->flags & PL08X_IS_PL080S)
+ cctl = pl08x_cctl_bits(cctl,
+ bd.srcbus.buswidth,
+ bd.dstbus.buswidth, 0);
+ else
+ cctl = pl08x_cctl_bits(cctl,
+ bd.srcbus.buswidth,
+ bd.dstbus.buswidth, tsize);
pl08x_fill_lli_for_desc(&bd, num_llis++,
lli_len, cctl, tsize);
total_bytes += lli_len;
@@ -2092,24 +2102,28 @@ static struct vendor_data vendor_pl080 = {
.channels = 8,
.flags = PL08X_IS_DUALMASTER,
.config_offset = PL080_CH_CONFIG,
+ .max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK,
};
static struct vendor_data vendor_nomadik = {
.channels = 8,
.flags = PL08X_IS_DUALMASTER | PL08X_IS_NOMADIK,
.config_offset = PL080_CH_CONFIG,
+ .max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK,
};
static struct vendor_data vendor_pl080s = {
.channels = 8,
.flags = PL08X_IS_DUALMASTER | PL08X_IS_PL080S,
.config_offset = PL080S_CH_CONFIG,
+ .max_transfer_size = PL080S_CONTROL_TRANSFER_SIZE_MASK,
};
static struct vendor_data vendor_pl081 = {
.channels = 2,
.flags = 0,
.config_offset = PL080_CH_CONFIG,
+ .max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK,
};
static struct amba_id pl08x_ids[] = {
--
1.8.2.1
--
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