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| author | Alexandre Bounine <alexandre.bounine@idt.com> | 2012-05-31 16:26:38 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-31 17:49:31 -0700 |
| commit | e42d98ebe7d754a2c9fbccd6186721d3ca8679f6 (patch) | |
| tree | eed734672410f2eb8fab07fbd14f88bfaf8a882f /include/linux/rio_drv.h | |
| parent | ce2d52cc1364a22fc1a161781e60ee3cbb499a6d (diff) | |
| download | op-kernel-dev-e42d98ebe7d754a2c9fbccd6186721d3ca8679f6.zip op-kernel-dev-e42d98ebe7d754a2c9fbccd6186721d3ca8679f6.tar.gz | |
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.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/rio_drv.h b/include/linux/rio_drv.h index 7f07470..31ad146 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 |
