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authorBarry Song <Baohua.Song@csr.com>2012-12-14 10:59:22 +0000
committerVinod Koul <vinod.koul@intel.com>2013-01-28 01:44:40 -0800
commit2518d1d1fc0ba7ef781bac97132bcfd6d7466c4b (patch)
tree7c38d76cbf4f92fc81dea18073f66f53027ce946 /drivers/dma/sirf-dma.c
parent6c5e6a3990ce64192b56ffafa5ffa5af129751d5 (diff)
downloadlinux-2518d1d1fc0ba7ef781bac97132bcfd6d7466c4b.tar.gz
DMAEngine: sirf: add DMA pause/resume support
pause/resume are important for users like ALSA sound drivers, this patches make the sirf prima2/marco support DMA commands DMA_PAUSE and DMA_RESUME. Signed-off-by: Barry Song <Baohua.Song@csr.com> Cc: Russell King <linux@arm.linux.org.uk> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/sirf-dma.c')
-rw-r--r--drivers/dma/sirf-dma.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/dma/sirf-dma.c b/drivers/dma/sirf-dma.c
index 3c210ba9f93..7d78cf7bb7f 100644
--- a/drivers/dma/sirf-dma.c
+++ b/drivers/dma/sirf-dma.c
@@ -313,6 +313,48 @@ static int sirfsoc_dma_terminate_all(struct sirfsoc_dma_chan *schan)
return 0;
}
+static int sirfsoc_dma_pause_chan(struct sirfsoc_dma_chan *schan)
+{
+ struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(&schan->chan);
+ int cid = schan->chan.chan_id;
+ unsigned long flags;
+
+ spin_lock_irqsave(&schan->lock, flags);
+
+ if (!sdma->is_marco)
+ writel_relaxed(readl_relaxed(sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL)
+ & ~((1 << cid) | 1 << (cid + 16)),
+ sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL);
+ else
+ writel_relaxed((1 << cid) | 1 << (cid + 16),
+ sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL_CLR);
+
+ spin_unlock_irqrestore(&schan->lock, flags);
+
+ return 0;
+}
+
+static int sirfsoc_dma_resume_chan(struct sirfsoc_dma_chan *schan)
+{
+ struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(&schan->chan);
+ int cid = schan->chan.chan_id;
+ unsigned long flags;
+
+ spin_lock_irqsave(&schan->lock, flags);
+
+ if (!sdma->is_marco)
+ writel_relaxed(readl_relaxed(sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL)
+ | ((1 << cid) | 1 << (cid + 16)),
+ sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL);
+ else
+ writel_relaxed((1 << cid) | 1 << (cid + 16),
+ sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL);
+
+ spin_unlock_irqrestore(&schan->lock, flags);
+
+ return 0;
+}
+
static int sirfsoc_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
unsigned long arg)
{
@@ -320,6 +362,10 @@ static int sirfsoc_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
switch (cmd) {
+ case DMA_PAUSE:
+ return sirfsoc_dma_pause_chan(schan);
+ case DMA_RESUME:
+ return sirfsoc_dma_resume_chan(schan);
case DMA_TERMINATE_ALL:
return sirfsoc_dma_terminate_all(schan);
case DMA_SLAVE_CONFIG: