From 72c7b67affc3ee63fc3df6e4a28d452a4e82e332 Mon Sep 17 00:00:00 2001 From: Peter Ujfalusi Date: Mon, 14 Apr 2014 14:41:59 +0300 Subject: 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 Acked-by: Joel Fernandes Reviewed-and-Tested-by: Joel Fernandes Signed-off-by: Vinod Koul --- drivers/dma/edma.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) (limited to 'drivers/dma') diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c index d7649d22975..35db3f282bd 100644 --- a/drivers/dma/edma.c +++ b/drivers/dma/edma.c @@ -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; } -- cgit v1.2.3-70-g09d2