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DMA: PL08x: avoid recalculating cctl at each prepare
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Now that we have separate cctl values for M>P and P>M transfers, we can
avoid calculating the cctl value each time we prepare a transaction.
Move the bus selection and increment setting to the slave configuration
and initialization functions.

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>
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Russell King - ARM Linux authored and Vinod Koul committed Jul 26, 2011
1 parent aa88cda commit 121c847
Showing 1 changed file with 42 additions and 36 deletions.
78 changes: 42 additions & 36 deletions drivers/dma/amba-pl08x.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1095,6 +1095,23 @@ static const struct burst_table burst_sizes[] = {
},
};

/*
* Given the source and destination available bus masks, select which
* will be routed to each port. We try to have source and destination
* on separate ports, but always respect the allowable settings.
*/
static u32 pl08x_select_bus(u8 src, u8 dst)
{
u32 cctl = 0;

if (!(dst & PL08X_AHB1) || ((dst & PL08X_AHB2) && (src & PL08X_AHB1)))
cctl |= PL080_CONTROL_DST_AHB2;
if (!(src & PL08X_AHB1) || ((src & PL08X_AHB2) && !(dst & PL08X_AHB2)))
cctl |= PL080_CONTROL_SRC_AHB2;

return cctl;
}

static u32 pl08x_cctl(u32 cctl)
{
cctl &= ~(PL080_CONTROL_SRC_AHB2 | PL080_CONTROL_DST_AHB2 |
Expand Down Expand Up @@ -1173,10 +1190,14 @@ static int dma_set_runtime_config(struct dma_chan *chan,

if (plchan->runtime_direction == DMA_FROM_DEVICE) {
plchan->src_addr = config->src_addr;
plchan->src_cctl = pl08x_cctl(cctl);
plchan->src_cctl = pl08x_cctl(cctl) | PL080_CONTROL_DST_INCR |
pl08x_select_bus(plchan->cd->periph_buses,
pl08x->mem_buses);
} else {
plchan->dst_addr = config->dst_addr;
plchan->dst_cctl = pl08x_cctl(cctl);
plchan->dst_cctl = pl08x_cctl(cctl) | PL080_CONTROL_SRC_INCR |
pl08x_select_bus(pl08x->mem_buses,
plchan->cd->periph_buses);
}

dev_dbg(&pl08x->adev->dev,
Expand Down Expand Up @@ -1277,23 +1298,6 @@ static int pl08x_prep_channel_resources(struct pl08x_dma_chan *plchan,
return 0;
}

/*
* Given the source and destination available bus masks, select which
* will be routed to each port. We try to have source and destination
* on separate ports, but always respect the allowable settings.
*/
static u32 pl08x_select_bus(struct pl08x_driver_data *pl08x, u8 src, u8 dst)
{
u32 cctl = 0;

if (!(dst & PL08X_AHB1) || ((dst & PL08X_AHB2) && (src & PL08X_AHB1)))
cctl |= PL080_CONTROL_DST_AHB2;
if (!(src & PL08X_AHB1) || ((src & PL08X_AHB2) && !(dst & PL08X_AHB2)))
cctl |= PL080_CONTROL_SRC_AHB2;

return cctl;
}

static struct pl08x_txd *pl08x_get_txd(struct pl08x_dma_chan *plchan,
unsigned long flags)
{
Expand Down Expand Up @@ -1345,8 +1349,8 @@ static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy(
txd->cctl |= PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR;

if (pl08x->vd->dualmaster)
txd->cctl |= pl08x_select_bus(pl08x,
pl08x->mem_buses, pl08x->mem_buses);
txd->cctl |= pl08x_select_bus(pl08x->mem_buses,
pl08x->mem_buses);

ret = pl08x_prep_channel_resources(plchan, txd);
if (ret)
Expand All @@ -1363,7 +1367,6 @@ static struct dma_async_tx_descriptor *pl08x_prep_slave_sg(
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
struct pl08x_driver_data *pl08x = plchan->host;
struct pl08x_txd *txd;
u8 src_buses, dst_buses;
int ret;

/*
Expand Down Expand Up @@ -1399,26 +1402,20 @@ 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 = plchan->dst_cctl | PL080_CONTROL_SRC_INCR;
txd->cctl = plchan->dst_cctl;
txd->src_addr = sgl->dma_address;
txd->dst_addr = plchan->dst_addr;
src_buses = pl08x->mem_buses;
dst_buses = plchan->cd->periph_buses;
} else if (direction == DMA_FROM_DEVICE) {
txd->ccfg |= PL080_FLOW_PER2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT;
txd->cctl = plchan->src_cctl | PL080_CONTROL_DST_INCR;
txd->cctl = plchan->src_cctl;
txd->src_addr = plchan->src_addr;
txd->dst_addr = sgl->dma_address;
src_buses = plchan->cd->periph_buses;
dst_buses = pl08x->mem_buses;
} else {
dev_err(&pl08x->adev->dev,
"%s direction unsupported\n", __func__);
return NULL;
}

txd->cctl |= pl08x_select_bus(pl08x, src_buses, dst_buses);

ret = pl08x_prep_channel_resources(plchan, txd);
if (ret)
return NULL;
Expand Down Expand Up @@ -1669,6 +1666,20 @@ static irqreturn_t pl08x_irq(int irq, void *dev)
return mask ? IRQ_HANDLED : IRQ_NONE;
}

static void pl08x_dma_slave_init(struct pl08x_dma_chan *chan)
{
u32 cctl = pl08x_cctl(chan->cd->cctl);

chan->slave = true;
chan->name = chan->cd->bus_id;
chan->src_addr = chan->cd->addr;
chan->dst_addr = chan->cd->addr;
chan->src_cctl = cctl | PL080_CONTROL_DST_INCR |
pl08x_select_bus(chan->cd->periph_buses, chan->host->mem_buses);
chan->dst_cctl = cctl | PL080_CONTROL_SRC_INCR |
pl08x_select_bus(chan->host->mem_buses, chan->cd->periph_buses);
}

/*
* Initialise the DMAC memcpy/slave channels.
* Make a local wrapper to hold required data
Expand Down Expand Up @@ -1700,13 +1711,8 @@ static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x,
chan->state = PL08X_CHAN_IDLE;

if (slave) {
chan->slave = true;
chan->name = pl08x->pd->slave_channels[i].bus_id;
chan->cd = &pl08x->pd->slave_channels[i];
chan->src_addr = chan->cd->addr;
chan->dst_addr = chan->cd->addr;
chan->src_cctl = pl08x_cctl(chan->cd->cctl);
chan->dst_cctl = pl08x_cctl(chan->cd->cctl);
pl08x_dma_slave_init(chan);
} else {
chan->cd = &pl08x->pd->memcpy_channel;
chan->name = kasprintf(GFP_KERNEL, "memcpy%d", i);
Expand Down

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