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ARM: PL08x: move AHB master port selection into prep_* functions

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As we initialize the default cctl value in the prep_* functions along
with the increment settings, we don't need to repeat the selection of
the AHB ports each time we create a LLI entry.  Do this in the prep_*
functions once per transfer.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Russell King - ARM Linux 2011-01-03 22:40:53 +00:00 committed by Dan Williams
parent 1cae78f120
commit c7da9a56d6
1 changed files with 23 additions and 24 deletions
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47
drivers/dma/amba-pl08x.c
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@ -597,26 +597,6 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
/* Get the default CCTL */
cctl = txd->cctl;
/*
* On the PL080 we have two bus masters and we
* should select one for source and one for
* destination. We try to use AHB2 for the
* bus which does not increment (typically the
* peripheral) else we just choose something.
*/
cctl &= ~(PL080_CONTROL_DST_AHB2 | PL080_CONTROL_SRC_AHB2);
if (pl08x->vd->dualmaster) {
if (cctl & PL080_CONTROL_SRC_INCR)
/* Source increments, use AHB2 for destination */
cctl |= PL080_CONTROL_DST_AHB2;
else if (cctl & PL080_CONTROL_DST_INCR)
/* Destination increments, use AHB2 for source */
cctl |= PL080_CONTROL_SRC_AHB2;
else
/* Just pick something, source AHB1 dest AHB2 */
cctl |= PL080_CONTROL_DST_AHB2;
}
/* Find maximum width of the source bus */
txd->srcbus.maxwidth =
pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_SWIDTH_MASK) >>
@ -1340,14 +1320,25 @@ static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy(
txd->direction = DMA_NONE;
txd->srcbus.addr = src;
txd->dstbus.addr = dest;
txd->len = len;
/* Set platform data for m2m */
txd->ccfg |= PL080_FLOW_MEM2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT;
txd->cctl = pl08x->pd->memcpy_channel.cctl;
txd->cctl = pl08x->pd->memcpy_channel.cctl &
~(PL080_CONTROL_DST_AHB2 | PL080_CONTROL_SRC_AHB2);
/* Both to be incremented or the code will break */
txd->cctl |= PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR;
txd->len = len;
/*
* On the PL080 we have two bus masters and we should select one for
* source and one for destination. We try to use AHB2 for the bus
* which does not increment (typically the peripheral) else we just
* choose something.
*/
if (pl08x->vd->dualmaster)
/* Source increments, use AHB2 for destination */
txd->cctl |= PL080_CONTROL_DST_AHB2;
ret = pl08x_prep_channel_resources(plchan, txd);
if (ret)
@ -1399,8 +1390,11 @@ static struct dma_async_tx_descriptor *pl08x_prep_slave_sg(
* channel target address dynamically at runtime.
*/
txd->direction = direction;
txd->len = sgl->length;
txd->cctl = plchan->cd->cctl &
~(PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR |
~(PL080_CONTROL_SRC_AHB2 | PL080_CONTROL_DST_AHB2 |
PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR |
PL080_CONTROL_PROT_MASK);
/* Access the cell in privileged mode, non-bufferable, non-cacheable */
@ -1409,6 +1403,9 @@ static struct dma_async_tx_descriptor *pl08x_prep_slave_sg(
if (direction == DMA_TO_DEVICE) {
txd->ccfg |= PL080_FLOW_MEM2PER << PL080_CONFIG_FLOW_CONTROL_SHIFT;
txd->cctl |= PL080_CONTROL_SRC_INCR;
if (pl08x->vd->dualmaster)
/* Source increments, use AHB2 for destination */
txd->cctl |= PL080_CONTROL_DST_AHB2;
txd->srcbus.addr = sgl->dma_address;
if (plchan->runtime_addr)
txd->dstbus.addr = plchan->runtime_addr;
@ -1417,6 +1414,9 @@ static struct dma_async_tx_descriptor *pl08x_prep_slave_sg(
} else if (direction == DMA_FROM_DEVICE) {
txd->ccfg |= PL080_FLOW_PER2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT;
txd->cctl |= PL080_CONTROL_DST_INCR;
if (pl08x->vd->dualmaster)
/* Destination increments, use AHB2 for source */
txd->cctl |= PL080_CONTROL_SRC_AHB2;
if (plchan->runtime_addr)
txd->srcbus.addr = plchan->runtime_addr;
else
@ -1427,7 +1427,6 @@ static struct dma_async_tx_descriptor *pl08x_prep_slave_sg(
"%s direction unsupported\n", __func__);
return NULL;
}
txd->len = sgl->length;
ret = pl08x_prep_channel_resources(plchan, txd);
if (ret)