lkml.org 
[lkml]   [2016]   [Oct]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/2] dmaengine: omap-dma: Support for slave devices with data port window
Date
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>
---
drivers/dma/omap-dma.c | 45 +++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 43 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index 025f499cb20d..29350f936154 100644
--- a/drivers/dma/omap-dma.c
+++ b/drivers/dma/omap-dma.c
@@ -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),
@@ -883,15 +886,18 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
unsigned i, es, en, frame_bytes;
bool ll_failed = false;
u32 burst;
+ int32_t port_window;

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;
@@ -923,11 +929,39 @@ 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;
+ d->fi = (-1) * (port_window - 1);
+
+ if (port_window / 64)
+ d->csdp = CSDP_SRC_BURST_64 | CSDP_SRC_PACKED;
+ else if (port_window / 32)
+ d->csdp = CSDP_SRC_BURST_32 | CSDP_SRC_PACKED;
+ else if (port_window / 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 / 64)
+ d->csdp = CSDP_DST_BURST_64 | CSDP_DST_PACKED;
+ else if (port_window / 32)
+ d->csdp = CSDP_DST_BURST_32 | CSDP_DST_PACKED;
+ else if (port_window / 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;
@@ -945,6 +979,9 @@ 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;
@@ -970,6 +1007,10 @@ 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;
+ osg->fi = (-1) * (port_window - 1);
+ }

if (d->using_ll) {
osg->t2_desc = dma_pool_alloc(od->desc_pool, GFP_ATOMIC,
--
2.10.1
\
 
 \ /
  Last update: 2016-10-25 12:51    [W:0.034 / U:5.688 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site