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authorAlexandre Bounine <alexandre.bounine@idt.com>2012-05-31 16:26:38 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-31 17:49:31 -0700
commite42d98ebe7d754a2c9fbccd6186721d3ca8679f6 (patch)
treeeed734672410f2eb8fab07fbd14f88bfaf8a882f /include/linux/rio_drv.h
parentce2d52cc1364a22fc1a161781e60ee3cbb499a6d (diff)
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/rio_drv.h')
-rw-r--r--include/linux/rio_drv.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/rio_drv.h b/include/linux/rio_drv.h
index 7f07470e1ed9..31ad146be316 100644
--- a/include/linux/rio_drv.h
+++ b/include/linux/rio_drv.h
@@ -377,6 +377,15 @@ void rio_unregister_driver(struct rio_driver *);
struct rio_dev *rio_dev_get(struct rio_dev *);
void rio_dev_put(struct rio_dev *);
+#ifdef CONFIG_RAPIDIO_DMA_ENGINE
+extern struct dma_chan *rio_request_dma(struct rio_dev *rdev);
+extern void rio_release_dma(struct dma_chan *dchan);
+extern struct dma_async_tx_descriptor *rio_dma_prep_slave_sg(
+ struct rio_dev *rdev, struct dma_chan *dchan,
+ struct rio_dma_data *data,
+ enum dma_transfer_direction direction, unsigned long flags);
+#endif
+
/**
* rio_name - Get the unique RIO device identifier
* @rdev: RIO device