linux-kernel - [PATCH v6 06/12] dmaengine: fsl-edma: simply ATTR_DSIZE and ATTR

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Message-Id: <20230614193544.2114603-7-Frank.Li@nxp.com>
Date:   Wed, 14 Jun 2023 15:35:38 -0400
From:   Frank Li <Frank.Li@....com>
To:     vkoul@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, dmaengine@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        peng.fan@....com, joy.zou@....com, shenwei.wang@....com,
        imx@...ts.linux.dev
Subject: [PATCH v6 06/12] dmaengine: fsl-edma: simply ATTR_DSIZE and ATTR_SSIZE by using ffs()

Removes all ATTR_DSIZE_*BIT(BYTE) and ATTR_SSIZE_*BIT(BYTE) definitions
in edma. Uses ffs() instead, as it gives identical results. This simplifies
the code and avoids adding more similar definitions in future V3 version.

Signed-off-by: Frank Li <Frank.Li@....com>
---
 drivers/dma/fsl-edma-common.c | 21 ++++++++-------------
 drivers/dma/fsl-edma-common.h | 10 ----------
 2 files changed, 8 insertions(+), 23 deletions(-)

diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c
index a9d17cf142fc..51fbd7531c74 100644
--- a/drivers/dma/fsl-edma-common.c
+++ b/drivers/dma/fsl-edma-common.c
@@ -154,18 +154,13 @@ void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
 
 static unsigned int fsl_edma_get_tcd_attr(enum dma_slave_buswidth addr_width)
 {
-	switch (addr_width) {
-	case 1:
-		return EDMA_TCD_ATTR_SSIZE_8BIT | EDMA_TCD_ATTR_DSIZE_8BIT;
-	case 2:
-		return EDMA_TCD_ATTR_SSIZE_16BIT | EDMA_TCD_ATTR_DSIZE_16BIT;
-	case 4:
-		return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT;
-	case 8:
-		return EDMA_TCD_ATTR_SSIZE_64BIT | EDMA_TCD_ATTR_DSIZE_64BIT;
-	default:
-		return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT;
-	}
+	u32 val;
+
+	if (addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
+		addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+
+	val = ffs(addr_width) - 1;
+	return val | (val << 8);
 }
 
 void fsl_edma_free_desc(struct virt_dma_desc *vdesc)
@@ -623,7 +618,7 @@ struct dma_async_tx_descriptor *fsl_edma_prep_memcpy(struct dma_chan *chan,
 
 	/* To match with copy_align and max_seg_size so 1 tcd is enough */
 	fsl_edma_fill_tcd(fsl_desc->tcd[0].vtcd, dma_src, dma_dst,
-			EDMA_TCD_ATTR_SSIZE_32BYTE | EDMA_TCD_ATTR_DSIZE_32BYTE,
+			fsl_edma_get_tcd_attr(DMA_SLAVE_BUSWIDTH_32_BYTES),
 			32, len, 0, 1, 1, 32, 0, true, true, false);
 
 	return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
diff --git a/drivers/dma/fsl-edma-common.h b/drivers/dma/fsl-edma-common.h
index 242ab7df8993..521b79fc3828 100644
--- a/drivers/dma/fsl-edma-common.h
+++ b/drivers/dma/fsl-edma-common.h
@@ -29,16 +29,6 @@
 #define EDMA_TCD_ATTR_DMOD(x)		(((x) & GENMASK(4, 0)) << 3)
 #define EDMA_TCD_ATTR_SSIZE(x)		(((x) & GENMASK(2, 0)) << 8)
 #define EDMA_TCD_ATTR_SMOD(x)		(((x) & GENMASK(4, 0)) << 11)
-#define EDMA_TCD_ATTR_DSIZE_8BIT	0
-#define EDMA_TCD_ATTR_DSIZE_16BIT	BIT(0)
-#define EDMA_TCD_ATTR_DSIZE_32BIT	BIT(1)
-#define EDMA_TCD_ATTR_DSIZE_64BIT	(BIT(0) | BIT(1))
-#define EDMA_TCD_ATTR_DSIZE_32BYTE	(BIT(2) | BIT(0))
-#define EDMA_TCD_ATTR_SSIZE_8BIT	0
-#define EDMA_TCD_ATTR_SSIZE_16BIT	(EDMA_TCD_ATTR_DSIZE_16BIT << 8)
-#define EDMA_TCD_ATTR_SSIZE_32BIT	(EDMA_TCD_ATTR_DSIZE_32BIT << 8)
-#define EDMA_TCD_ATTR_SSIZE_64BIT	(EDMA_TCD_ATTR_DSIZE_64BIT << 8)
-#define EDMA_TCD_ATTR_SSIZE_32BYTE	(EDMA_TCD_ATTR_DSIZE_32BYTE << 8)
 
 #define EDMA_TCD_CITER_CITER(x)		((x) & GENMASK(14, 0))
 #define EDMA_TCD_BITER_BITER(x)		((x) & GENMASK(14, 0))
-- 
2.34.1