dmaengine: Add an enum for the dmaengine alignment constraints

Most drivers need to set constraints on the buffer alignment for async tx
operations. However, even though it is documented, some drivers either use
a defined constant that is not matching what the alignment variable expects
(like DMA_BUSWIDTH_* constants) or fill the alignment in bytes instead of
power of two.

Add a new enum for these alignments that matches what the framework
expects, and convert the drivers to it.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/coh901318.c

@@ -2730,7 +2730,7 @@ static int __init coh901318_probe(struct platform_device *pdev)
 	 * This controller can only access address at even 32bit boundaries,
 	 * i.e. 2^2
 	 */
-	base->dma_memcpy.copy_align = 2;
+	base->dma_memcpy.copy_align = DMAENGINE_ALIGN_4_BYTES;
 	err = dma_async_device_register(&base->dma_memcpy);
 
 	if (err)

drivers/dma/dma-jz4780.c

@@ -775,7 +775,7 @@ static int jz4780_dma_probe(struct platform_device *pdev)
 	dma_cap_set(DMA_CYCLIC, dd->cap_mask);
 
 	dd->dev = dev;
-	dd->copy_align = 2; /* 2^2 = 4 byte alignment */
+	dd->copy_align = DMAENGINE_ALIGN_4_BYTES;
 	dd->device_alloc_chan_resources = jz4780_dma_alloc_chan_resources;
 	dd->device_free_chan_resources = jz4780_dma_free_chan_resources;
 	dd->device_prep_slave_sg = jz4780_dma_prep_slave_sg;

drivers/dma/edma.c

@@ -1000,7 +1000,7 @@ static void edma_dma_init(struct edma_cc *ecc, struct dma_device *dma,
 	 * code using dma memcpy must make sure alignment of
 	 * length is at dma->copy_align boundary.
 	 */
-	dma->copy_align = DMA_SLAVE_BUSWIDTH_4_BYTES;
+	dma->copy_align = DMAENGINE_ALIGN_4_BYTES;
 
 	INIT_LIST_HEAD(&dma->channels);
 }

drivers/dma/imx-dma.c

@@ -1187,7 +1187,7 @@ static int __init imxdma_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, imxdma);
 
-	imxdma->dma_device.copy_align = 2; /* 2^2 = 4 bytes alignment */
+	imxdma->dma_device.copy_align = DMAENGINE_ALIGN_4_BYTES;
 	imxdma->dma_device.dev->dma_parms = &imxdma->dma_parms;
 	dma_set_max_seg_size(imxdma->dma_device.dev, 0xffffff);
 

drivers/dma/k3dma.c

@@ -24,7 +24,6 @@
 #include "virt-dma.h"
 
 #define DRIVER_NAME		"k3-dma"
-#define DMA_ALIGN		3
 #define DMA_MAX_SIZE		0x1ffc
 
 #define INT_STAT		0x00
@@ -732,7 +731,7 @@ static int k3_dma_probe(struct platform_device *op)
 	d->slave.device_pause = k3_dma_transfer_pause;
 	d->slave.device_resume = k3_dma_transfer_resume;
 	d->slave.device_terminate_all = k3_dma_terminate_all;
-	d->slave.copy_align = DMA_ALIGN;
+	d->slave.copy_align = DMAENGINE_ALIGN_8_BYTES;
 
 	/* init virtual channel */
 	d->chans = devm_kzalloc(&op->dev,

drivers/dma/mic_x100_dma.h

@@ -39,7 +39,7 @@
  */
 #define MIC_DMA_MAX_NUM_CHAN	8
 #define MIC_DMA_NUM_CHAN	4
-#define MIC_DMA_ALIGN_SHIFT	6
+#define MIC_DMA_ALIGN_SHIFT	DMAENGINE_ALIGN_64_BYTES
 #define MIC_DMA_ALIGN_BYTES	(1 << MIC_DMA_ALIGN_SHIFT)
 #define MIC_DMA_DESC_RX_SIZE	(128 * 1024 - 4)
 

drivers/dma/mmp_pdma.c

@@ -72,7 +72,6 @@
 #define DCMD_WIDTH4	(3 << 14)	/* 4 byte width (Word) */
 #define DCMD_LENGTH	0x01fff		/* length mask (max = 8K - 1) */
 
-#define PDMA_ALIGNMENT		3
 #define PDMA_MAX_DESC_BYTES	DCMD_LENGTH
 
 struct mmp_pdma_desc_hw {
@@ -1071,7 +1070,7 @@ static int mmp_pdma_probe(struct platform_device *op)
 	pdev->device.device_issue_pending = mmp_pdma_issue_pending;
 	pdev->device.device_config = mmp_pdma_config;
 	pdev->device.device_terminate_all = mmp_pdma_terminate_all;
-	pdev->device.copy_align = PDMA_ALIGNMENT;
+	pdev->device.copy_align = DMAENGINE_ALIGN_8_BYTES;
 	pdev->device.src_addr_widths = widths;
 	pdev->device.dst_addr_widths = widths;
 	pdev->device.directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);

drivers/dma/mmp_tdma.c

@@ -100,7 +100,6 @@ enum mmp_tdma_type {
 	PXA910_SQU,
 };
 
-#define TDMA_ALIGNMENT		3
 #define TDMA_MAX_XFER_BYTES    SZ_64K
 
 struct mmp_tdma_chan {
@@ -695,7 +694,7 @@ static int mmp_tdma_probe(struct platform_device *pdev)
 	tdev->device.device_pause = mmp_tdma_pause_chan;
 	tdev->device.device_resume = mmp_tdma_resume_chan;
 	tdev->device.device_terminate_all = mmp_tdma_terminate_all;
-	tdev->device.copy_align = TDMA_ALIGNMENT;
+	tdev->device.copy_align = DMAENGINE_ALIGN_8_BYTES;
 
 	dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
 	platform_set_drvdata(pdev, tdev);

drivers/dma/ste_dma40.c

@@ -2853,7 +2853,7 @@ static void d40_ops_init(struct d40_base *base, struct dma_device *dev)
 		 * This controller can only access address at even
 		 * 32bit boundaries, i.e. 2^2
 		 */
-		dev->copy_align = 2;
+		dev->copy_align = DMAENGINE_ALIGN_4_BYTES;
 	}
 
 	if (dma_has_cap(DMA_SG, dev->cap_mask))

drivers/dma/sun6i-dma.c

@@ -969,7 +969,7 @@ static int sun6i_dma_probe(struct platform_device *pdev)
 	sdc->slave.device_issue_pending		= sun6i_dma_issue_pending;
 	sdc->slave.device_prep_slave_sg		= sun6i_dma_prep_slave_sg;
 	sdc->slave.device_prep_dma_memcpy	= sun6i_dma_prep_dma_memcpy;
-	sdc->slave.copy_align			= 4;
+	sdc->slave.copy_align			= DMAENGINE_ALIGN_4_BYTES;
 	sdc->slave.device_config		= sun6i_dma_config;
 	sdc->slave.device_pause			= sun6i_dma_pause;
 	sdc->slave.device_resume		= sun6i_dma_resume;

drivers/dma/xgene-dma.c

@@ -150,7 +150,6 @@
 #define XGENE_DMA_PQ_CHANNEL		1
 #define XGENE_DMA_MAX_BYTE_CNT		0x4000	/* 16 KB */
 #define XGENE_DMA_MAX_64B_DESC_BYTE_CNT	0x14000	/* 80 KB */
-#define XGENE_DMA_XOR_ALIGNMENT		6	/* 64 Bytes */
 #define XGENE_DMA_MAX_XOR_SRC		5
 #define XGENE_DMA_16K_BUFFER_LEN_CODE	0x0
 #define XGENE_DMA_INVALID_LEN_CODE	0x7800000000000000ULL
@@ -1740,13 +1739,13 @@ static void xgene_dma_set_caps(struct xgene_dma_chan *chan,
 	if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
 		dma_dev->device_prep_dma_xor = xgene_dma_prep_xor;
 		dma_dev->max_xor = XGENE_DMA_MAX_XOR_SRC;
-		dma_dev->xor_align = XGENE_DMA_XOR_ALIGNMENT;
+		dma_dev->xor_align = DMAENGINE_ALIGN_64_BYTES;
 	}
 
 	if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
 		dma_dev->device_prep_dma_pq = xgene_dma_prep_pq;
 		dma_dev->max_pq = XGENE_DMA_MAX_XOR_SRC;
-		dma_dev->pq_align = XGENE_DMA_XOR_ALIGNMENT;
+		dma_dev->pq_align = DMAENGINE_ALIGN_64_BYTES;
 	}
 }
 

include/linux/dmaengine.h

@@ -584,6 +584,20 @@ struct dma_tx_state {
 	u32 residue;
 };
 
+/**
+ * enum dmaengine_alignment - defines alignment of the DMA async tx
+ * buffers
+ */
+enum dmaengine_alignment {
+	DMAENGINE_ALIGN_1_BYTE = 0,
+	DMAENGINE_ALIGN_2_BYTES = 1,
+	DMAENGINE_ALIGN_4_BYTES = 2,
+	DMAENGINE_ALIGN_8_BYTES = 3,
+	DMAENGINE_ALIGN_16_BYTES = 4,
+	DMAENGINE_ALIGN_32_BYTES = 5,
+	DMAENGINE_ALIGN_64_BYTES = 6,
+};
+
 /**
  * struct dma_device - info on the entity supplying DMA services
  * @chancnt: how many DMA channels are supported
@@ -645,10 +659,10 @@ struct dma_device {
 	dma_cap_mask_t  cap_mask;
 	unsigned short max_xor;
 	unsigned short max_pq;
-	u8 copy_align;
-	u8 xor_align;
-	u8 pq_align;
-	u8 fill_align;
+	enum dmaengine_alignment copy_align;
+	enum dmaengine_alignment xor_align;
+	enum dmaengine_alignment pq_align;
+	enum dmaengine_alignment fill_align;
 	#define DMA_HAS_PQ_CONTINUE (1 << 15)
 
 	int dev_id;
@@ -833,7 +847,8 @@ static inline dma_cookie_t dmaengine_submit(struct dma_async_tx_descriptor *desc
 	return desc->tx_submit(desc);
 }
 
-static inline bool dmaengine_check_align(u8 align, size_t off1, size_t off2, size_t len)
+static inline bool dmaengine_check_align(enum dmaengine_alignment align,
+					 size_t off1, size_t off2, size_t len)
 {
 	size_t mask;