[PATCH v2 3/4] dmaengine: rcar-dmac: Add helpers for clearing DMA channel status

[Geert Uytterhoeven]

Extract the code to clear the status of one or all channels into their
own helpers, to prepare for the different handling of the R-Car V3U SoC.

Signed-off-by: Geert Uytterhoeven <geert+rene...@glider.be>
---
v2:
  - No changes.
---
 drivers/dma/sh/rcar-dmac.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c
index 537550b4121bbc22..7a0f802c61e5152d 100644
--- a/drivers/dma/sh/rcar-dmac.c
+++ b/drivers/dma/sh/rcar-dmac.c
@@ -336,6 +336,17 @@ static void rcar_dmac_chan_write(struct rcar_dmac_chan 
*chan, u32 reg, u32 data)
                writel(data, chan->iomem + reg);
 }
 
+static void rcar_dmac_chan_clear(struct rcar_dmac *dmac,
+                                struct rcar_dmac_chan *chan)
+{
+       rcar_dmac_write(dmac, RCAR_DMACHCLR, BIT(chan->index));
+}
+
+static void rcar_dmac_chan_clear_all(struct rcar_dmac *dmac)
+{
+       rcar_dmac_write(dmac, RCAR_DMACHCLR, dmac->channels_mask);
+}
+
 /* 
-----------------------------------------------------------------------------
  * Initialization and configuration
  */
@@ -451,7 +462,7 @@ static int rcar_dmac_init(struct rcar_dmac *dmac)
        u16 dmaor;
 
        /* Clear all channels and enable the DMAC globally. */
-       rcar_dmac_write(dmac, RCAR_DMACHCLR, dmac->channels_mask);
+       rcar_dmac_chan_clear_all(dmac);
        rcar_dmac_write(dmac, RCAR_DMAOR,
                        RCAR_DMAOR_PRI_FIXED | RCAR_DMAOR_DME);
 
@@ -1566,7 +1577,7 @@ static irqreturn_t rcar_dmac_isr_channel(int irq, void 
*dev)
                 * because channel is already stopped in error case.
                 * We need to clear register and check DE bit as recovery.
                 */
-               rcar_dmac_write(dmac, RCAR_DMACHCLR, 1 << chan->index);
+               rcar_dmac_chan_clear(dmac, chan);
                rcar_dmac_chcr_de_barrier(chan);
                reinit = true;
                goto spin_lock_end;
-- 
2.25.1