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| author | Elen Song <elen.song@atmel.com> | 2013-05-10 11:00:50 +0800 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2013-07-05 11:40:30 +0530 |
| commit | d088c33b646e9f3564eea7a057a2cb697c18bcd0 (patch) | |
| tree | 297d676a700dad9089b642d80c5823f0a97cd7c1 | |
| parent | 6c22770f644bf23aecc11fedd7b305488a861bfc (diff) | |
| download | op-kernel-dev-d088c33b646e9f3564eea7a057a2cb697c18bcd0.zip op-kernel-dev-d088c33b646e9f3564eea7a057a2cb697c18bcd0.tar.gz | |
DMA: AT91: Get transfer width
In one dma transfer, the data transfer width can be configured and it is limited by source or destination peripheral width,
tx_width will save the transfer width, but for memcpy, either source or destination transfer width is taken as tx_width.
Signed-off-by: Elen Song <elen.song@atmel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
| -rw-r--r-- | drivers/dma/at_hdmac.c | 3 | ||||
| -rw-r--r-- | drivers/dma/at_hdmac_regs.h | 2 |
2 files changed, 5 insertions, 0 deletions
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c index 9e1ad73..4c101a9 100644 --- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -615,6 +615,7 @@ atc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, /* First descriptor of the chain embedds additional information */ first->txd.cookie = -EBUSY; first->len = len; + first->tx_width = src_width; /* set end-of-link to the last link descriptor of list*/ set_desc_eol(desc); @@ -761,6 +762,7 @@ atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, /* First descriptor of the chain embedds additional information */ first->txd.cookie = -EBUSY; first->len = total_len; + first->tx_width = reg_width; /* first link descriptor of list is responsible of flags */ first->txd.flags = flags; /* client is in control of this ack */ @@ -919,6 +921,7 @@ atc_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, /* First descriptor of the chain embedds additional information */ first->txd.cookie = -EBUSY; first->len = buf_len; + first->tx_width = reg_width; return &first->txd; diff --git a/drivers/dma/at_hdmac_regs.h b/drivers/dma/at_hdmac_regs.h index c604d26..3679933 100644 --- a/drivers/dma/at_hdmac_regs.h +++ b/drivers/dma/at_hdmac_regs.h @@ -182,6 +182,7 @@ struct at_lli { * @txd: support for the async_tx api * @desc_node: node on the channed descriptors list * @len: total transaction bytecount + * @tx_width: transfer width */ struct at_desc { /* FIRST values the hardware uses */ @@ -192,6 +193,7 @@ struct at_desc { struct dma_async_tx_descriptor txd; struct list_head desc_node; size_t len; + u32 tx_width; }; static inline struct at_desc * |
