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authorNicolas Ferre <nicolas.ferre@atmel.com>2011-05-06 19:56:53 +0200
committerVinod Koul <vinod.koul@intel.com>2011-05-09 11:44:13 +0530
commite257e1563f28890f54b5f82861373bb4b32dd770 (patch)
tree74a53085d734b41ea233d6fccf8e424d9a405311 /drivers/dma
parent23b5e3ad68a3c26a6a36039ea907997664aedcab (diff)
downloadop-kernel-dev-e257e1563f28890f54b5f82861373bb4b32dd770.zip
op-kernel-dev-e257e1563f28890f54b5f82861373bb4b32dd770.tar.gz
dmaengine: at_hdmac: use descriptor chaining help function
A little function helps to chain descriptors: it is already used in cyclic dma operations, now use it in memcpy and slave_sg preparation functions. Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/at_hdmac.c33
1 files changed, 3 insertions, 30 deletions
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 5968245..2c6bc3aa 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -626,16 +626,7 @@ atc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
desc->txd.cookie = 0;
- if (!first) {
- first = desc;
- } else {
- /* inform the HW lli about chaining */
- prev->lli.dscr = desc->txd.phys;
- /* insert the link descriptor to the LD ring */
- list_add_tail(&desc->desc_node,
- &first->tx_list);
- }
- prev = desc;
+ atc_desc_chain(&first, &prev, desc);
}
/* First descriptor of the chain embedds additional information */
@@ -726,16 +717,7 @@ atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
| len >> mem_width;
desc->lli.ctrlb = ctrlb;
- if (!first) {
- first = desc;
- } else {
- /* inform the HW lli about chaining */
- prev->lli.dscr = desc->txd.phys;
- /* insert the link descriptor to the LD ring */
- list_add_tail(&desc->desc_node,
- &first->tx_list);
- }
- prev = desc;
+ atc_desc_chain(&first, &prev, desc);
total_len += len;
}
break;
@@ -769,16 +751,7 @@ atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
| len >> reg_width;
desc->lli.ctrlb = ctrlb;
- if (!first) {
- first = desc;
- } else {
- /* inform the HW lli about chaining */
- prev->lli.dscr = desc->txd.phys;
- /* insert the link descriptor to the LD ring */
- list_add_tail(&desc->desc_node,
- &first->tx_list);
- }
- prev = desc;
+ atc_desc_chain(&first, &prev, desc);
total_len += len;
}
break;
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