summaryrefslogtreecommitdiffstats
path: root/include/linux/dmaengine.h
diff options
context:
space:
mode:
authorVinod Koul <vinod.koul@intel.com>2011-07-25 19:57:52 +0530
committerVinod Koul <vinod.koul@intel.com>2011-08-08 16:48:14 +0530
commit90b44f8ffdf6c66d190ee71b330009bf7f11a208 (patch)
tree2e1b068b048118664793573d2a21784b5326274e /include/linux/dmaengine.h
parent322a8b034003c0d46d39af85bf24fee27b902f48 (diff)
downloadop-kernel-dev-90b44f8ffdf6c66d190ee71b330009bf7f11a208.zip
op-kernel-dev-90b44f8ffdf6c66d190ee71b330009bf7f11a208.tar.gz
dmaengine: add helper function for slave_single
For clients which require a single slave transfer and dont want to be bothered about the scatterlist api, this helper gives simple API for this transfer and creates single scatterlist for DMA API Idea from Russell King Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'include/linux/dmaengine.h')
-rw-r--r--include/linux/dmaengine.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 8fbf40e..0d738c9 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -24,6 +24,7 @@
#include <linux/device.h>
#include <linux/uio.h>
#include <linux/dma-direction.h>
+#include <linux/scatterlist.h>
struct scatterlist;
@@ -519,6 +520,16 @@ static inline int dmaengine_slave_config(struct dma_chan *chan,
(unsigned long)config);
}
+static inline struct dma_async_tx_descriptor *dmaengine_prep_slave_single(
+ struct dma_chan *chan, void *buf, size_t len,
+ enum dma_data_direction dir, unsigned long flags)
+{
+ struct scatterlist sg;
+ sg_init_one(&sg, buf, len);
+
+ return chan->device->device_prep_slave_sg(chan, &sg, 1, dir, flags);
+}
+
static inline int dmaengine_terminate_all(struct dma_chan *chan)
{
return dmaengine_device_control(chan, DMA_TERMINATE_ALL, 0);
OpenPOWER on IntegriCloud