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dmaengine: omap-dma: program hardware directly 

Program the transfer parameters directly into the hardware, rather
than using the functions in arch/arm/plat-omap/dma.c.

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>
hifive-unleashed-5.1
Russell King 2013-11-02 13:26:57 +00:00
parent 1b416c4b41
commit b9e97822da
2 changed files with 130 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

142
drivers/dma/omap-dma.c
View File

@ -99,16 +99,94 @@ static void omap_dma_start_sg(struct omap_chan *c, struct omap_desc *d,
unsigned idx)
{
struct omap_sg *sg = d->sg + idx;
uint32_t val;
if (d->dir == DMA_DEV_TO_MEM)
omap_set_dma_dest_params(c->dma_ch, OMAP_DMA_PORT_EMIFF,
OMAP_DMA_AMODE_POST_INC, sg->addr, 0, 0);
else
omap_set_dma_src_params(c->dma_ch, OMAP_DMA_PORT_EMIFF,
OMAP_DMA_AMODE_POST_INC, sg->addr, 0, 0);
if (d->dir == DMA_DEV_TO_MEM) {
if (dma_omap1()) {
val = c->plat->dma_read(CSDP, c->dma_ch);
val &= ~(0x1f << 9);
val |= OMAP_DMA_PORT_EMIFF << 9;
c->plat->dma_write(val, CSDP, c->dma_ch);
}
omap_set_dma_transfer_params(c->dma_ch, d->es, sg->en, sg->fn,
d->sync_mode, c->dma_sig, d->sync_type);
val = c->plat->dma_read(CCR, c->dma_ch);
val &= ~(0x03 << 14);
val |= OMAP_DMA_AMODE_POST_INC << 14;
c->plat->dma_write(val, CCR, c->dma_ch);
c->plat->dma_write(sg->addr, CDSA, c->dma_ch);
c->plat->dma_write(0, CDEI, c->dma_ch);
c->plat->dma_write(0, CDFI, c->dma_ch);
} else {
if (dma_omap1()) {
val = c->plat->dma_read(CSDP, c->dma_ch);
val &= ~(0x1f << 2);
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);
val |= OMAP_DMA_AMODE_POST_INC << 12;
c->plat->dma_write(val, CCR, c->dma_ch);
c->plat->dma_write(sg->addr, CSSA, c->dma_ch);
c->plat->dma_write(0, CSEI, c->dma_ch);
c->plat->dma_write(0, CSFI, 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);
if (dma_omap1()) {
val = c->plat->dma_read(CCR, c->dma_ch);
val &= ~(1 << 5);
if (d->sync_mode == OMAP_DMA_SYNC_FRAME)
val |= 1 << 5;
c->plat->dma_write(val, CCR, c->dma_ch);
val = c->plat->dma_read(CCR2, c->dma_ch);
val &= ~(1 << 2);
if (d->sync_mode == OMAP_DMA_SYNC_BLOCK)
val |= 1 << 2;
c->plat->dma_write(val, CCR2, c->dma_ch);
} else if (c->dma_sig) {
val = c->plat->dma_read(CCR, c->dma_ch);
/* DMA_SYNCHRO_CONTROL_UPPER depends on the channel number */
val &= ~((1 << 23) | (3 << 19) | 0x1f);
val |= (c->dma_sig & ~0x1f) << 14;
val |= c->dma_sig & 0x1f;
if (d->sync_mode & OMAP_DMA_SYNC_FRAME)
val |= 1 << 5;
else
val &= ~(1 << 5);
if (d->sync_mode & OMAP_DMA_SYNC_BLOCK)
val |= 1 << 18;
else
val &= ~(1 << 18);
switch (d->sync_type) {
case OMAP_DMA_DST_SYNC_PREFETCH:
val &= ~(1 << 24); /* dest synch */
val |= 1 << 23; /* Prefetch */
break;
case 0:
val &= ~(1 << 24); /* dest synch */
break;
default:
val |= 1 << 24; /* source synch */
break;
}
c->plat->dma_write(val, CCR, c->dma_ch);
}
c->plat->dma_write(sg->en, CEN, c->dma_ch);
c->plat->dma_write(sg->fn, CFN, c->dma_ch);
omap_start_dma(c->dma_ch);
}
@ -117,6 +195,7 @@ static void omap_dma_start_desc(struct omap_chan *c)
{
struct virt_dma_desc *vd = vchan_next_desc(&c->vc);
struct omap_desc *d;
uint32_t val;
if (!vd) {
c->desc = NULL;
@ -128,12 +207,39 @@ static void omap_dma_start_desc(struct omap_chan *c)
c->desc = d = to_omap_dma_desc(&vd->tx);
c->sgidx = 0;
if (d->dir == DMA_DEV_TO_MEM)
omap_set_dma_src_params(c->dma_ch, d->periph_port,
OMAP_DMA_AMODE_CONSTANT, d->dev_addr, 0, d->fi);
else
omap_set_dma_dest_params(c->dma_ch, d->periph_port,
OMAP_DMA_AMODE_CONSTANT, d->dev_addr, 0, d->fi);
if (d->dir == DMA_DEV_TO_MEM) {
if (dma_omap1()) {
val = c->plat->dma_read(CSDP, c->dma_ch);
val &= ~(0x1f << 2);
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 << 12);
val |= OMAP_DMA_AMODE_CONSTANT << 12;
c->plat->dma_write(val, CCR, c->dma_ch);
c->plat->dma_write(d->dev_addr, CSSA, c->dma_ch);
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);
val |= d->periph_port << 9;
c->plat->dma_write(val, CSDP, c->dma_ch);
}
val = c->plat->dma_read(CCR, c->dma_ch);
val &= ~(0x03 << 14);
val |= OMAP_DMA_AMODE_CONSTANT << 14;
c->plat->dma_write(val, CCR, c->dma_ch);
c->plat->dma_write(d->dev_addr, CDSA, c->dma_ch);
c->plat->dma_write(0, CDEI, c->dma_ch);
c->plat->dma_write(d->fi, CDFI, c->dma_ch);
}
omap_dma_start_sg(c, d, 0);
}
@ -452,8 +558,12 @@ static struct dma_async_tx_descriptor *omap_dma_prep_dma_cyclic(
}
if (dma_omap2plus()) {
omap_set_dma_src_burst_mode(c->dma_ch, OMAP_DMA_DATA_BURST_16);
omap_set_dma_dest_burst_mode(c->dma_ch, OMAP_DMA_DATA_BURST_16);
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);

6
include/linux/omap-dma.h
View File

@ -289,8 +289,10 @@ struct omap_system_dma_plat_info {
#define dma_omap2plus() 0
#endif
#define dma_omap1() (!dma_omap2plus())
#define dma_omap15xx() ((dma_omap1() && (d->dev_caps & ENABLE_1510_MODE)))
#define dma_omap16xx() ((dma_omap1() && (d->dev_caps & ENABLE_16XX_MODE)))
#define __dma_omap15xx(d) (dma_omap1() && (d)->dev_caps & ENABLE_1510_MODE)
#define __dma_omap16xx(d) (dma_omap1() && (d)->dev_caps & ENABLE_16XX_MODE)
#define dma_omap15xx() __dma_omap15xx(d)
#define dma_omap16xx() __dma_omap16xx(d)
extern struct omap_system_dma_plat_info *omap_get_plat_info(void);