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| author |   Zhangfei Gao <zhangfei.gao@linaro.org> | 2013-06-28 20:39:12 +0800 |
|---|---|---|
| committer |   Vinod Koul <vinod.koul@intel.com> | 2013-08-13 16:32:59 +0530 |
| commit | 7bb587f4eef8f71ce589f360ab99bb54ab0fc85d (patch) | |
| tree | f2ab1f2830f68fe172224765f366c176d809717f /include/linux/dmaengine.h | |
| parent | Linux 3.11-rc4 (diff) | |
| download | linux-dev-7bb587f4eef8f71ce589f360ab99bb54ab0fc85d.tar.xz linux-dev-7bb587f4eef8f71ce589f360ab99bb54ab0fc85d.zip | |
dmaengine: add interface of dma_get_slave_channel
Suggested by Arnd, add dma_get_slave_channel interface
Dma host driver could get specific channel specificied by request line, rather than filter.
host example:
static struct dma_chan *xx_of_dma_simple_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct xx_dma_dev *d = ofdma->of_dma_data;
unsigned int request = dma_spec->args[0];
if (request > d->dma_requests)
return NULL;
return dma_get_slave_channel(&(d->chans[request].vc.chan));
}
probe:
of_dma_controller_register((&op->dev)->of_node, xx_of_dma_simple_xlate, d);
Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'include/linux/dmaengine.h')
| -rw-r--r-- | include/linux/dmaengine.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index cb286b1acdb6..c271608e862e 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -995,6 +995,7 @@ int dma_async_device_register(struct dma_device *device); void dma_async_device_unregister(struct dma_device *device); void dma_run_dependencies(struct dma_async_tx_descriptor *tx); struct dma_chan *dma_find_channel(enum dma_transaction_type tx_type); +struct dma_chan *dma_get_slave_channel(struct dma_chan *chan); struct dma_chan *net_dma_find_channel(void); #define dma_request_channel(mask, x, y) __dma_request_channel(&(mask), x, y) #define dma_request_slave_channel_compat(mask, x, y, dev, name) \ |