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authorElen Song <elen.song@atmel.com>2013-05-10 11:00:50 +0800
committerVinod Koul <vinod.koul@intel.com>2013-07-05 11:40:30 +0530
commitd088c33b646e9f3564eea7a057a2cb697c18bcd0 (patch)
tree297d676a700dad9089b642d80c5823f0a97cd7c1
parent6c22770f644bf23aecc11fedd7b305488a861bfc (diff)
downloadop-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.c3
-rw-r--r--drivers/dma/at_hdmac_regs.h2
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 *
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