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dmaengine: omap-dma: Support for slave devices with data port window 

Based on the src/dst_port_window_size - if it is set - configure the DMA
channel to use double indexing in order to be able to loop within the
address window.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Peter Ujfalusi 2016-11-29 16:23:42 +02:00 committed by Vinod Koul
parent 54cd255808
commit 201ac4861c
1 changed files with 61 additions and 2 deletions
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63
drivers/dma/omap-dma.c
View File

@ -166,6 +166,9 @@ enum {
CSDP_DST_BURST_16 = 1 << 14,
CSDP_DST_BURST_32 = 2 << 14,
CSDP_DST_BURST_64 = 3 << 14,
CSDP_WRITE_NON_POSTED = 0 << 16,
CSDP_WRITE_POSTED = 1 << 16,
CSDP_WRITE_LAST_NON_POSTED = 2 << 16,
CICR_TOUT_IE = BIT(0), /* OMAP1 only */
CICR_DROP_IE = BIT(1),
@ -881,15 +884,18 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
unsigned i, es, en, frame_bytes;
bool ll_failed = false;
u32 burst;
u32 port_window, port_window_bytes;
if (dir == DMA_DEV_TO_MEM) {
dev_addr = c->cfg.src_addr;
dev_width = c->cfg.src_addr_width;
burst = c->cfg.src_maxburst;
port_window = c->cfg.src_port_window_size;
} else if (dir == DMA_MEM_TO_DEV) {
dev_addr = c->cfg.dst_addr;
dev_width = c->cfg.dst_addr_width;
burst = c->cfg.dst_maxburst;
port_window = c->cfg.dst_port_window_size;
} else {
dev_err(chan->device->dev, "%s: bad direction?\n", __func__);
return NULL;
@ -910,6 +916,12 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
return NULL;
}
/* When the port_window is used, one frame must cover the window */
if (port_window) {
burst = port_window;
port_window_bytes = port_window * es_bytes[es];
}
/* Now allocate and setup the descriptor. */
d = kzalloc(sizeof(*d) + sglen * sizeof(d->sg[0]), GFP_ATOMIC);
if (!d)
@ -921,11 +933,45 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
d->ccr = c->ccr | CCR_SYNC_FRAME;
if (dir == DMA_DEV_TO_MEM) {
d->ccr |= CCR_DST_AMODE_POSTINC | CCR_SRC_AMODE_CONSTANT;
d->csdp = CSDP_DST_BURST_64 | CSDP_DST_PACKED;
d->ccr |= CCR_DST_AMODE_POSTINC;
if (port_window) {
d->ccr |= CCR_SRC_AMODE_DBLIDX;
d->ei = 1;
/*
* One frame covers the port_window and by configure
* the source frame index to be -1 * (port_window - 1)
* we instruct the sDMA that after a frame is processed
* it should move back to the start of the window.
*/
d->fi = -(port_window_bytes - 1);
if (port_window_bytes >= 64)
d->csdp = CSDP_SRC_BURST_64 | CSDP_SRC_PACKED;
else if (port_window_bytes >= 32)
d->csdp = CSDP_SRC_BURST_32 | CSDP_SRC_PACKED;
else if (port_window_bytes >= 16)
d->csdp = CSDP_SRC_BURST_16 | CSDP_SRC_PACKED;
} else {
d->ccr |= CCR_SRC_AMODE_CONSTANT;
}
} else {
d->ccr |= CCR_DST_AMODE_CONSTANT | CCR_SRC_AMODE_POSTINC;
d->csdp = CSDP_SRC_BURST_64 | CSDP_SRC_PACKED;
d->ccr |= CCR_SRC_AMODE_POSTINC;
if (port_window) {
d->ccr |= CCR_DST_AMODE_DBLIDX;
if (port_window_bytes >= 64)
d->csdp = CSDP_DST_BURST_64 | CSDP_DST_PACKED;
else if (port_window_bytes >= 32)
d->csdp = CSDP_DST_BURST_32 | CSDP_DST_PACKED;
else if (port_window_bytes >= 16)
d->csdp = CSDP_DST_BURST_16 | CSDP_DST_PACKED;
} else {
d->ccr |= CCR_DST_AMODE_CONSTANT;
}
}
d->cicr = CICR_DROP_IE | CICR_BLOCK_IE;
@ -943,6 +989,9 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
d->ccr |= CCR_TRIGGER_SRC;
d->cicr |= CICR_MISALIGNED_ERR_IE | CICR_TRANS_ERR_IE;
if (port_window)
d->csdp |= CSDP_WRITE_LAST_NON_POSTED;
}
if (od->plat->errata & DMA_ERRATA_PARALLEL_CHANNELS)
d->clnk_ctrl = c->dma_ch;
@ -968,6 +1017,16 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
osg->addr = sg_dma_address(sgent);
osg->en = en;
osg->fn = sg_dma_len(sgent) / frame_bytes;
if (port_window && dir == DMA_MEM_TO_DEV) {
osg->ei = 1;
/*
* One frame covers the port_window and by configure
* the source frame index to be -1 * (port_window - 1)
* we instruct the sDMA that after a frame is processed
* it should move back to the start of the window.
*/
osg->fi = -(port_window_bytes - 1);
}
if (d->using_ll) {
osg->t2_desc = dma_pool_alloc(od->desc_pool, GFP_ATOMIC,