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From:   Geert Uytterhoeven <geert+renesas@glider.be>
To:     Vinod Koul <vkoul@kernel.org>
Cc:     Rob Herring <robh+dt@kernel.org>,
        Dan Williams <dan.j.williams@intel.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
        Wolfram Sang <wsa+renesas@sang-engineering.com>,
        Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>,
        dmaengine@vger.kernel.org, devicetree@vger.kernel.org,
        linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org,
        Geert Uytterhoeven <geert+renesas@glider.be>
Subject: [PATCH v2 3/4] dmaengine: rcar-dmac: Add helpers for clearing DMA channel status
Date:   Mon, 25 Jan 2021 15:24:30 +0100
Message-Id: <20210125142431.1049668-4-geert+renesas@glider.be>
In-Reply-To: <20210125142431.1049668-1-geert+renesas@glider.be>
References: <20210125142431.1049668-1-geert+renesas@glider.be>
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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+renesas@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