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authorIra Snyder <iws@ovro.caltech.edu>2010-09-30 15:46:46 +0400
committerDan Williams <dan.j.williams@intel.com>2010-10-08 01:41:41 +0400
commit968f19ae802fdc6b6b6b5af6fe79cf23d281be0f (patch)
tree122f3912ed717627b0e5bac8c72f42ef2eb0cb6e /include/linux/dmaengine.h
parentc14330417ef2050f4bf38ac20e125785fea14351 (diff)
downloadlinux-968f19ae802fdc6b6b6b5af6fe79cf23d281be0f.tar.xz
fsldma: improved DMA_SLAVE support
Now that the generic DMAEngine API has support for scatterlist to scatterlist copying, the device_prep_slave_sg() portion of the DMA_SLAVE API is no longer necessary and has been removed. However, the device_control() portion of the DMA_SLAVE API is still useful to control device specific parameters, such as externally controlled DMA transfers and maximum burst length. A special dma_ctrl_cmd has been added to enable externally controlled DMA transfers. This is currently specific to the Freescale DMA controller, but can easily be made generic when another user is found. Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'include/linux/dmaengine.h')
-rw-r--r--include/linux/dmaengine.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 2c9ee98f6c77..885f35211675 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -120,12 +120,15 @@ enum dma_ctrl_flags {
* configuration data in statically from the platform). An additional
* argument of struct dma_slave_config must be passed in with this
* command.
+ * @FSLDMA_EXTERNAL_START: this command will put the Freescale DMA controller
+ * into external start mode.
*/
enum dma_ctrl_cmd {
DMA_TERMINATE_ALL,
DMA_PAUSE,
DMA_RESUME,
DMA_SLAVE_CONFIG,
+ FSLDMA_EXTERNAL_START,
};
/**