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dmaengine: omap-dma: consolidate setup of CSDP

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Consolidate the setup of the channel source destination parameters
register.  This way, we calculate the required CSDP value when we setup
a transfer descriptor, and only write it to the device registers once
when we start the descriptor.

Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2013-11-02 18:51:53 +00:00
parent 3997cab391
commit 2f0d13bdf6
1 changed files with 28 additions and 36 deletions
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64
drivers/dma/omap-dma.c
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@ -60,8 +60,8 @@ struct omap_desc {
uint8_t es; /* OMAP_DMA_DATA_TYPE_xxx */
uint8_t sync_mode; /* OMAP_DMA_SYNC_xxx */
uint8_t sync_type; /* OMAP_DMA_xxx_SYNC* */
uint8_t periph_port; /* Peripheral port */
uint16_t cicr; /* CICR value */
uint32_t csdp; /* CSDP value */
unsigned sglen;
struct omap_sg sg[0];
@ -240,14 +240,6 @@ static void omap_dma_start_desc(struct omap_chan *c)
c->sgidx = 0;
if (d->dir == DMA_DEV_TO_MEM) {
if (dma_omap1()) {
val = c->plat->dma_read(CSDP, c->dma_ch);
val &= ~(0x1f << 9 | 0x1f << 2);
val |= OMAP_DMA_PORT_EMIFF << 9;
val |= d->periph_port << 2;
c->plat->dma_write(val, CSDP, c->dma_ch);
}
val = c->plat->dma_read(CCR, c->dma_ch);
val &= ~(0x03 << 14 | 0x03 << 12);
val |= OMAP_DMA_AMODE_POST_INC << 14;
@ -258,14 +250,6 @@ static void omap_dma_start_desc(struct omap_chan *c)
c->plat->dma_write(0, CSEI, c->dma_ch);
c->plat->dma_write(d->fi, CSFI, c->dma_ch);
} else {
if (dma_omap1()) {
val = c->plat->dma_read(CSDP, c->dma_ch);
val &= ~(0x1f << 9 | 0x1f << 2);
val |= d->periph_port << 9;
val |= OMAP_DMA_PORT_EMIFF << 2;
c->plat->dma_write(val, CSDP, c->dma_ch);
}
val = c->plat->dma_read(CCR, c->dma_ch);
val &= ~(0x03 << 12 | 0x03 << 14);
val |= OMAP_DMA_AMODE_CONSTANT << 14;
@ -277,10 +261,7 @@ static void omap_dma_start_desc(struct omap_chan *c)
c->plat->dma_write(d->fi, CDFI, c->dma_ch);
}
val = c->plat->dma_read(CSDP, c->dma_ch);
val &= ~0x03;
val |= d->es;
c->plat->dma_write(val, CSDP, c->dma_ch);
c->plat->dma_write(d->csdp, CSDP, c->dma_ch);
if (dma_omap1()) {
val = c->plat->dma_read(CCR, c->dma_ch);
@ -602,13 +583,21 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
d->es = es;
d->sync_mode = OMAP_DMA_SYNC_FRAME;
d->sync_type = sync_type;
d->periph_port = OMAP_DMA_PORT_TIPB;
d->cicr = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
d->csdp = es;
if (dma_omap1())
if (dma_omap1()) {
d->cicr |= OMAP1_DMA_TOUT_IRQ;
else
if (dir == DMA_DEV_TO_MEM)
d->csdp |= OMAP_DMA_PORT_EMIFF << 9 |
OMAP_DMA_PORT_TIPB << 2;
else
d->csdp |= OMAP_DMA_PORT_TIPB << 9 |
OMAP_DMA_PORT_EMIFF << 2;
} else {
d->cicr |= OMAP2_DMA_MISALIGNED_ERR_IRQ | OMAP2_DMA_TRANS_ERR_IRQ;
}
/*
* Build our scatterlist entries: each contains the address,
@ -690,7 +679,6 @@ static struct dma_async_tx_descriptor *omap_dma_prep_dma_cyclic(
else
d->sync_mode = OMAP_DMA_SYNC_ELEMENT;
d->sync_type = sync_type;
d->periph_port = OMAP_DMA_PORT_MPUI;
d->sg[0].addr = buf_addr;
d->sg[0].en = period_len / es_bytes[es];
d->sg[0].fn = buf_len / period_len;
@ -699,11 +687,24 @@ static struct dma_async_tx_descriptor *omap_dma_prep_dma_cyclic(
if (flags & DMA_PREP_INTERRUPT)
d->cicr |= OMAP_DMA_FRAME_IRQ;
if (dma_omap1())
d->csdp = es;
if (dma_omap1()) {
d->cicr |= OMAP1_DMA_TOUT_IRQ;
else
if (dir == DMA_DEV_TO_MEM)
d->csdp |= OMAP_DMA_PORT_EMIFF << 9 |
OMAP_DMA_PORT_MPUI << 2;
else
d->csdp |= OMAP_DMA_PORT_MPUI << 9 |
OMAP_DMA_PORT_EMIFF << 2;
} else {
d->cicr |= OMAP2_DMA_MISALIGNED_ERR_IRQ | OMAP2_DMA_TRANS_ERR_IRQ;
/* src and dst burst mode 16 */
d->csdp |= 3 << 14 | 3 << 7;
}
if (!c->cyclic) {
c->cyclic = true;
@ -716,15 +717,6 @@ static struct dma_async_tx_descriptor *omap_dma_prep_dma_cyclic(
}
}
if (dma_omap2plus()) {
uint32_t val;
val = c->plat->dma_read(CSDP, c->dma_ch);
val |= 0x03 << 7; /* src burst mode 16 */
val |= 0x03 << 14; /* dst burst mode 16 */
c->plat->dma_write(val, CSDP, c->dma_ch);
}
return vchan_tx_prep(&c->vc, &d->vd, flags);
}