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dmaengine: Add dma_client parameter to device_alloc_chan_resources

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A DMA controller capable of doing slave transfers may need to know a
few things about the slave when preparing the channel. We don't want
to add this information to struct dma_channel since the channel hasn't
yet been bound to a client at this point.

Instead, pass a reference to the client requesting the channel to the
driver's device_alloc_chan_resources hook so that it can pick the
necessary information from the dma_client struct by itself.

[dan.j.williams@intel.com: fixed up fsldma and mv_xor]
Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Haavard Skinnemoen
2008-07-08 11:58:58 -07:00
committed by Dan Williams
parent 4a776f0aa9
commit 848c536a37
6 changed files with 19 additions and 13 deletions
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3
include/linux/dmaengine.h
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@@ -281,7 +281,8 @@ struct dma_device {
int dev_id;
struct device *dev;
int (*device_alloc_chan_resources)(struct dma_chan *chan);
int (*device_alloc_chan_resources)(struct dma_chan *chan,
struct dma_client *client);
void (*device_free_chan_resources)(struct dma_chan *chan);
struct dma_async_tx_descriptor *(*device_prep_dma_memcpy)(