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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>
This commit is contained in:
Andy Shevchenko 2013-01-09 10:17:14 +02:00 committed by Vinod Koul
parent f5c6a7df35
commit 21fe3c5245
1 changed files with 22 additions and 9 deletions
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31
drivers/dma/dw_dmac.c
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@ -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) {