dmaengine: dw: extract dwc_chan_pause() for future use
iDMA 32-bit has a special handling of the FIFO during pause() /
terminate_all(). Prepare code to implement that.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index e3749ec..4a558d5 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -927,22 +927,26 @@
return 0;
}
-static int dwc_pause(struct dma_chan *chan)
+static void dwc_chan_pause(struct dw_dma_chan *dwc)
{
- struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
- unsigned long flags;
unsigned int count = 20; /* timeout iterations */
u32 cfglo;
- 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) && count--)
udelay(2);
set_bit(DW_DMA_IS_PAUSED, &dwc->flags);
+}
+static int dwc_pause(struct dma_chan *chan)
+{
+ struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
+ unsigned long flags;
+
+ spin_lock_irqsave(&dwc->lock, flags);
+ dwc_chan_pause(dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
return 0;