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authorAlexandre Bounine <alexandre.bounine@idt.com>2012-06-01 03:26:38 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-06-01 04:49:31 +0400
commite42d98ebe7d754a2c9fbccd6186721d3ca8679f6 (patch)
treeeed734672410f2eb8fab07fbd14f88bfaf8a882f /include/linux/dmaengine.h
parentce2d52cc1364a22fc1a161781e60ee3cbb499a6d (diff)
downloadlinux-e42d98ebe7d754a2c9fbccd6186721d3ca8679f6.tar.xz
rapidio: add DMA engine support for RIO data transfers
Adds DMA Engine framework support into RapidIO subsystem. Uses DMA Engine DMA_SLAVE interface to generate data transfers to/from remote RapidIO target devices. Introduces RapidIO-specific wrapper for prep_slave_sg() interface with an extra parameter to pass target specific information. Uses scatterlist to describe local data buffer. Address flat data buffer on a remote side. Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Dan Williams <dan.j.williams@intel.com> Acked-by: Vinod Koul <vinod.koul@linux.intel.com> Cc: Li Yang <leoli@freescale.com> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/dmaengine.h')
-rw-r--r--include/linux/dmaengine.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index d3fec584e8c3..56377df39124 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -635,6 +635,18 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_slave_sg(
dir, flags, NULL);
}
+#ifdef CONFIG_RAPIDIO_DMA_ENGINE
+struct rio_dma_ext;
+static inline struct dma_async_tx_descriptor *dmaengine_prep_rio_sg(
+ struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len,
+ enum dma_transfer_direction dir, unsigned long flags,
+ struct rio_dma_ext *rio_ext)
+{
+ return chan->device->device_prep_slave_sg(chan, sgl, sg_len,
+ dir, flags, rio_ext);
+}
+#endif
+
static inline struct dma_async_tx_descriptor *dmaengine_prep_dma_cyclic(
struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
size_t period_len, enum dma_transfer_direction dir)