diff options
| author |   Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2013-01-09 10:17:14 +0200 |
|---|---|---|
| committer |   Vinod Koul <vinod.koul@intel.com> | 2013-01-09 06:30:59 -0800 |
| commit | 21fe3c5245647d200a7ba25d42b80d21c578a8dc (patch) | |
| tree | 2a79b7236dc49b3475558cb530d8f0844a6bf067 | |
| parent | dw_dmac: update tx_node_active in dwc_do_single_block (diff) | |
| download | linux-dev-21fe3c5245647d200a7ba25d42b80d21c578a8dc.tar.xz linux-dev-21fe3c5245647d200a7ba25d42b80d21c578a8dc.zip | |
dma: dw_dmac: add dwc_chan_pause and dwc_chan_resume
We will use at least the dwc_chan_resume() later.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
| -rw-r--r-- | drivers/dma/dw_dmac.c | 31 |
1 files changed, 22 insertions, 9 deletions
diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c index d6b322a1f565..6c9e20a7ff51 100644 --- a/drivers/dma/dw_dmac.c +++ b/drivers/dma/dw_dmac.c @@ -988,6 +988,26 @@ set_runtime_config(struct dma_chan *chan, struct dma_slave_config *sconfig) return 0; } +static inline void dwc_chan_pause(struct dw_dma_chan *dwc) +{ + u32 cfglo = channel_readl(dwc, CFG_LO); + + channel_writel(dwc, CFG_LO, cfglo | DWC_CFGL_CH_SUSP); + while (!(channel_readl(dwc, CFG_LO) & DWC_CFGL_FIFO_EMPTY)) + cpu_relax(); + + dwc->paused = true; +} + +static inline void dwc_chan_resume(struct dw_dma_chan *dwc) +{ + u32 cfglo = channel_readl(dwc, CFG_LO); + + channel_writel(dwc, CFG_LO, cfglo & ~DWC_CFGL_CH_SUSP); + + dwc->paused = false; +} + static int dwc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, unsigned long arg) { @@ -995,18 +1015,13 @@ static int dwc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, struct dw_dma *dw = to_dw_dma(chan->device); struct dw_desc *desc, *_desc; unsigned long flags; - u32 cfglo; LIST_HEAD(list); if (cmd == DMA_PAUSE) { spin_lock_irqsave(&dwc->lock, flags); - cfglo = channel_readl(dwc, CFG_LO); - channel_writel(dwc, CFG_LO, cfglo | DWC_CFGL_CH_SUSP); - while (!(channel_readl(dwc, CFG_LO) & DWC_CFGL_FIFO_EMPTY)) - cpu_relax(); + dwc_chan_pause(dwc); - dwc->paused = true; spin_unlock_irqrestore(&dwc->lock, flags); } else if (cmd == DMA_RESUME) { if (!dwc->paused) @@ -1014,9 +1029,7 @@ static int dwc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, spin_lock_irqsave(&dwc->lock, flags); - cfglo = channel_readl(dwc, CFG_LO); - channel_writel(dwc, CFG_LO, cfglo & ~DWC_CFGL_CH_SUSP); - dwc->paused = false; + dwc_chan_resume(dwc); spin_unlock_irqrestore(&dwc->lock, flags); } else if (cmd == DMA_TERMINATE_ALL) { |