3 files changed, 65 insertions, 44 deletions

diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index 5c062548957c..455b7a4f1e87 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -61,6 +61,13 @@
  */
 #define NR_DESCS_PER_CHANNEL	64
 
+/* The set of bus widths supported by the DMA controller */
+#define DW_DMA_BUSWIDTHS			  \
+	BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED)	| \
+	BIT(DMA_SLAVE_BUSWIDTH_1_BYTE)		| \
+	BIT(DMA_SLAVE_BUSWIDTH_2_BYTES)		| \
+	BIT(DMA_SLAVE_BUSWIDTH_4_BYTES)
+
 /*----------------------------------------------------------------------*/
 
 static struct device *chan2dev(struct dma_chan *chan)
@@ -955,8 +962,7 @@ static inline void convert_burst(u32 *maxburst)
 		*maxburst = 0;
 }
 
-static int
-set_runtime_config(struct dma_chan *chan, struct dma_slave_config *sconfig)
+static int dwc_config(struct dma_chan *chan, struct dma_slave_config *sconfig)
 {
 	struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
 
@@ -973,16 +979,25 @@ set_runtime_config(struct dma_chan *chan, struct dma_slave_config *sconfig)
 	return 0;
 }
 
-static inline void dwc_chan_pause(struct dw_dma_chan *dwc)
+static int dwc_pause(struct dma_chan *chan)
 {
-	u32 cfglo = channel_readl(dwc, CFG_LO);
-	unsigned int count = 20;	/* timeout iterations */
+	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);
 
 	dwc->paused = true;
+
+	spin_unlock_irqrestore(&dwc->lock, flags);
+
+	return 0;
 }
 
 static inline void dwc_chan_resume(struct dw_dma_chan *dwc)
@@ -994,53 +1009,48 @@ static inline void dwc_chan_resume(struct dw_dma_chan *dwc)
 	dwc->paused = false;
 }
 
-static int dwc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
-		       unsigned long arg)
+static int dwc_resume(struct dma_chan *chan)
 {
 	struct dw_dma_chan	*dwc = to_dw_dma_chan(chan);
-	struct dw_dma		*dw = to_dw_dma(chan->device);
-	struct dw_desc		*desc, *_desc;
 	unsigned long		flags;
-	LIST_HEAD(list);
 
-	if (cmd == DMA_PAUSE) {
-		spin_lock_irqsave(&dwc->lock, flags);
+	if (!dwc->paused)
+		return 0;
 
-		dwc_chan_pause(dwc);
+	spin_lock_irqsave(&dwc->lock, flags);
 
-		spin_unlock_irqrestore(&dwc->lock, flags);
-	} else if (cmd == DMA_RESUME) {
-		if (!dwc->paused)
-			return 0;
+	dwc_chan_resume(dwc);
 
-		spin_lock_irqsave(&dwc->lock, flags);
+	spin_unlock_irqrestore(&dwc->lock, flags);
 
-		dwc_chan_resume(dwc);
+	return 0;
+}
 
-		spin_unlock_irqrestore(&dwc->lock, flags);
-	} else if (cmd == DMA_TERMINATE_ALL) {
-		spin_lock_irqsave(&dwc->lock, flags);
+static int dwc_terminate_all(struct dma_chan *chan)
+{
+	struct dw_dma_chan	*dwc = to_dw_dma_chan(chan);
+	struct dw_dma		*dw = to_dw_dma(chan->device);
+	struct dw_desc		*desc, *_desc;
+	unsigned long		flags;
+	LIST_HEAD(list);
 
-		clear_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags);
+	spin_lock_irqsave(&dwc->lock, flags);
 
-		dwc_chan_disable(dw, dwc);
+	clear_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags);
+
+	dwc_chan_disable(dw, dwc);
 
-		dwc_chan_resume(dwc);
+	dwc_chan_resume(dwc);
 
-		/* active_list entries will end up before queued entries */
-		list_splice_init(&dwc->queue, &list);
-		list_splice_init(&dwc->active_list, &list);
+	/* active_list entries will end up before queued entries */
+	list_splice_init(&dwc->queue, &list);
+	list_splice_init(&dwc->active_list, &list);
 
-		spin_unlock_irqrestore(&dwc->lock, flags);
+	spin_unlock_irqrestore(&dwc->lock, flags);
 
-		/* Flush all pending and queued descriptors */
-		list_for_each_entry_safe(desc, _desc, &list, desc_node)
-			dwc_descriptor_complete(dwc, desc, false);
-	} else if (cmd == DMA_SLAVE_CONFIG) {
-		return set_runtime_config(chan, (struct dma_slave_config *)arg);
-	} else {
-		return -ENXIO;
-	}
+	/* Flush all pending and queued descriptors */
+	list_for_each_entry_safe(desc, _desc, &list, desc_node)
+		dwc_descriptor_complete(dwc, desc, false);
 
 	return 0;
 }
@@ -1551,7 +1561,8 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
 		}
 	} else {
 		dw->nr_masters = pdata->nr_masters;
-		memcpy(dw->data_width, pdata->data_width, 4);
+		for (i = 0; i < dw->nr_masters; i++)
+			dw->data_width[i] = pdata->data_width[i];
 	}
 
 	/* Calculate all channel mask before DMA setup */
@@ -1656,13 +1667,23 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
 	dw->dma.device_free_chan_resources = dwc_free_chan_resources;
 
 	dw->dma.device_prep_dma_memcpy = dwc_prep_dma_memcpy;
-
 	dw->dma.device_prep_slave_sg = dwc_prep_slave_sg;
-	dw->dma.device_control = dwc_control;
+
+	dw->dma.device_config = dwc_config;
+	dw->dma.device_pause = dwc_pause;
+	dw->dma.device_resume = dwc_resume;
+	dw->dma.device_terminate_all = dwc_terminate_all;
 
 	dw->dma.device_tx_status = dwc_tx_status;
 	dw->dma.device_issue_pending = dwc_issue_pending;
 
+	/* DMA capabilities */
+	dw->dma.src_addr_widths = DW_DMA_BUSWIDTHS;
+	dw->dma.dst_addr_widths = DW_DMA_BUSWIDTHS;
+	dw->dma.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV) |
+			     BIT(DMA_MEM_TO_MEM);
+	dw->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
+
 	err = dma_async_device_register(&dw->dma);
 	if (err)
 		goto err_dma_register;
diff --git a/drivers/dma/dw/platform.c b/drivers/dma/dw/platform.c
index 32ea1aca7a0e..6565a361e7e5 100644
--- a/drivers/dma/dw/platform.c
+++ b/drivers/dma/dw/platform.c
@@ -100,7 +100,7 @@ dw_dma_parse_dt(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct dw_dma_platform_data *pdata;
-	u32 tmp, arr[4];
+	u32 tmp, arr[DW_DMA_MAX_NR_MASTERS];
 
 	if (!np) {
 		dev_err(&pdev->dev, "Missing DT data\n");
@@ -127,7 +127,7 @@ dw_dma_parse_dt(struct platform_device *pdev)
 		pdata->block_size = tmp;
 
 	if (!of_property_read_u32(np, "dma-masters", &tmp)) {
-		if (tmp > 4)
+		if (tmp > DW_DMA_MAX_NR_MASTERS)
 			return NULL;
 
 		pdata->nr_masters = tmp;
diff --git a/drivers/dma/dw/regs.h b/drivers/dma/dw/regs.h
index 848e232f7cc7..241ff2b1402b 100644
--- a/drivers/dma/dw/regs.h
+++ b/drivers/dma/dw/regs.h
@@ -252,7 +252,7 @@ struct dw_dma_chan {
 	u8			src_master;
 	u8			dst_master;
 
-	/* configuration passed via DMA_SLAVE_CONFIG */
+	/* configuration passed via .device_config */
 	struct dma_slave_config dma_sconfig;
 };
 
@@ -285,7 +285,7 @@ struct dw_dma {
 
 	/* hardware configuration */
 	unsigned char		nr_masters;
-	unsigned char		data_width[4];
+	unsigned char		data_width[DW_DMA_MAX_NR_MASTERS];
 };
 
 static inline struct dw_dma_regs __iomem *__dw_regs(struct dw_dma *dw)