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dmaengine: edma: Add support for DMA_PAUSE/RESUME operation 

Pause/Resume can be used by the audio stack when the stream is paused/resumed
The edma platform code has support for this and the legacy audio stack used
this.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Joel Fernandes <joelf@ti.com>
Reviewed-and-Tested-by: Joel Fernandes <joelf@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Peter Ujfalusi 2014-04-14 14:41:59 +03:00 committed by Vinod Koul
parent b2b617de04
commit 72c7b67aff
1 changed files with 28 additions and 0 deletions
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28
drivers/dma/edma.c
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@ -242,6 +242,26 @@ static int edma_slave_config(struct edma_chan *echan,
return 0;
}
static int edma_dma_pause(struct edma_chan *echan)
{
/* Pause/Resume only allowed with cyclic mode */
if (!echan->edesc->cyclic)
return -EINVAL;
edma_pause(echan->ch_num);
return 0;
}
static int edma_dma_resume(struct edma_chan *echan)
{
/* Pause/Resume only allowed with cyclic mode */
if (!echan->edesc->cyclic)
return -EINVAL;
edma_resume(echan->ch_num);
return 0;
}
static int edma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
unsigned long arg)
{
@ -257,6 +277,14 @@ static int edma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
config = (struct dma_slave_config *)arg;
ret = edma_slave_config(echan, config);
break;
case DMA_PAUSE:
ret = edma_dma_pause(echan);
break;
case DMA_RESUME:
ret = edma_dma_resume(echan);
break;
default:
ret = -ENOSYS;
}