diff options
| author | Nicolas Ferre <nicolas.ferre@atmel.com> | 2011-05-06 19:56:53 +0200 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2011-05-09 08:14:13 +0200 |
| commit | e257e1563f28890f54b5f82861373bb4b32dd770 (patch) | |
| tree | 74a53085d734b41ea233d6fccf8e424d9a405311 /drivers/dma | |
| parent | dmaengine: at_hdmac: implement pause and resume in atc_control (diff) | |
| download | linux-e257e1563f28890f54b5f82861373bb4b32dd770.tar.xz linux-e257e1563f28890f54b5f82861373bb4b32dd770.zip | |
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.c | 33 |
1 files changed, 3 insertions, 30 deletions
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c index 5968245e1e6a..2c6bc3aa3dd0 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; |