1 files changed, 254 insertions, 35 deletions

diff --git a/drivers/dma/mmp_pdma.c b/drivers/dma/mmp_pdma.c
index a95d31103d30..d07229a74886 100644
--- a/drivers/dma/mmp_pdma.c
+++ b/drivers/dma/mmp_pdma.c
@@ -15,6 +15,8 @@
 #include <linux/device.h>
 #include <linux/platform_data/mmp_dma.h>
 #include <linux/dmapool.h>
+#include <linux/clk.h>
+#include <linux/reset.h>
 #include <linux/of_dma.h>
 #include <linux/of.h>
 
@@ -23,9 +25,12 @@
 #define DCSR		0x0000
 #define DALGN		0x00a0
 #define DINT		0x00f0
-#define DDADR		0x0200
+#define DDADR(n)	(0x0200 + ((n) << 4))
 #define DSADR(n)	(0x0204 + ((n) << 4))
 #define DTADR(n)	(0x0208 + ((n) << 4))
+#define DDADRH(n)	(0x0300 + ((n) << 4))
+#define DSADRH(n)	(0x0304 + ((n) << 4))
+#define DTADRH(n)	(0x0308 + ((n) << 4))
 #define DCMD		0x020c
 
 #define DCSR_RUN	BIT(31)	/* Run Bit (read / write) */
@@ -42,6 +47,7 @@
 #define DCSR_EORSTOPEN	BIT(26)	/* STOP on an EOR */
 #define DCSR_SETCMPST	BIT(25)	/* Set Descriptor Compare Status */
 #define DCSR_CLRCMPST	BIT(24)	/* Clear Descriptor Compare Status */
+#define DCSR_LPAEEN	BIT(21)	/* Long Physical Address Extension Enable */
 #define DCSR_CMPST	BIT(10)	/* The Descriptor Compare Status */
 #define DCSR_EORINTR	BIT(9)	/* The end of Receive */
 
@@ -74,6 +80,16 @@ struct mmp_pdma_desc_hw {
 	u32 dsadr;	/* DSADR value for the current transfer */
 	u32 dtadr;	/* DTADR value for the current transfer */
 	u32 dcmd;	/* DCMD value for the current transfer */
+	/*
+	 * The following 32-bit words are only used in the 64-bit, ie.
+	 * LPAE (Long Physical Address Extension) mode.
+	 * They are used to specify the high 32 bits of the descriptor's
+	 * addresses.
+	 */
+	u32 ddadrh;	/* High 32-bit of DDADR */
+	u32 dsadrh;	/* High 32-bit of DSADR */
+	u32 dtadrh;	/* High 32-bit of DTADR */
+	u32 rsvd;	/* reserved */
 } __aligned(32);
 
 struct mmp_pdma_desc_sw {
@@ -118,12 +134,55 @@ struct mmp_pdma_phy {
 	struct mmp_pdma_chan *vchan;
 };
 
+/**
+ * struct mmp_pdma_ops - Operations for the MMP PDMA controller
+ *
+ * Hardware Register Operations (read/write hardware registers):
+ * @write_next_addr: Function to program address of next descriptor into
+ *                   DDADR/DDADRH
+ * @read_src_addr: Function to read the source address from DSADR/DSADRH
+ * @read_dst_addr: Function to read the destination address from DTADR/DTADRH
+ *
+ * Descriptor Memory Operations (manipulate descriptor structs in memory):
+ * @set_desc_next_addr: Function to set next descriptor address in descriptor
+ * @set_desc_src_addr: Function to set the source address in descriptor
+ * @set_desc_dst_addr: Function to set the destination address in descriptor
+ * @get_desc_src_addr: Function to get the source address from descriptor
+ * @get_desc_dst_addr: Function to get the destination address from descriptor
+ *
+ * Controller Configuration:
+ * @run_bits:   Control bits in DCSR register for channel start/stop
+ * @dma_mask:   DMA addressing capability of controller. 0 to use OF/platform
+ *              settings, or explicit mask like DMA_BIT_MASK(32/64)
+ */
+struct mmp_pdma_ops {
+	/* Hardware Register Operations */
+	void (*write_next_addr)(struct mmp_pdma_phy *phy, dma_addr_t addr);
+	u64 (*read_src_addr)(struct mmp_pdma_phy *phy);
+	u64 (*read_dst_addr)(struct mmp_pdma_phy *phy);
+
+	/* Descriptor Memory Operations */
+	void (*set_desc_next_addr)(struct mmp_pdma_desc_hw *desc,
+				   dma_addr_t addr);
+	void (*set_desc_src_addr)(struct mmp_pdma_desc_hw *desc,
+				  dma_addr_t addr);
+	void (*set_desc_dst_addr)(struct mmp_pdma_desc_hw *desc,
+				  dma_addr_t addr);
+	u64 (*get_desc_src_addr)(const struct mmp_pdma_desc_hw *desc);
+	u64 (*get_desc_dst_addr)(const struct mmp_pdma_desc_hw *desc);
+
+	/* Controller Configuration */
+	u32 run_bits;
+	u64 dma_mask;
+};
+
 struct mmp_pdma_device {
 	int				dma_channels;
 	void __iomem			*base;
 	struct device			*dev;
 	struct dma_device		device;
 	struct mmp_pdma_phy		*phy;
+	const struct mmp_pdma_ops	*ops;
 	spinlock_t phy_lock; /* protect alloc/free phy channels */
 };
 
@@ -136,24 +195,112 @@ struct mmp_pdma_device {
 #define to_mmp_pdma_dev(dmadev)					\
 	container_of(dmadev, struct mmp_pdma_device, device)
 
-static int mmp_pdma_config_write(struct dma_chan *dchan,
-			   struct dma_slave_config *cfg,
-			   enum dma_transfer_direction direction);
+/* For 32-bit PDMA */
+static void write_next_addr_32(struct mmp_pdma_phy *phy, dma_addr_t addr)
+{
+	writel(addr, phy->base + DDADR(phy->idx));
+}
+
+static u64 read_src_addr_32(struct mmp_pdma_phy *phy)
+{
+	return readl(phy->base + DSADR(phy->idx));
+}
+
+static u64 read_dst_addr_32(struct mmp_pdma_phy *phy)
+{
+	return readl(phy->base + DTADR(phy->idx));
+}
+
+static void set_desc_next_addr_32(struct mmp_pdma_desc_hw *desc, dma_addr_t addr)
+{
+	desc->ddadr = addr;
+}
+
+static void set_desc_src_addr_32(struct mmp_pdma_desc_hw *desc, dma_addr_t addr)
+{
+	desc->dsadr = addr;
+}
+
+static void set_desc_dst_addr_32(struct mmp_pdma_desc_hw *desc, dma_addr_t addr)
+{
+	desc->dtadr = addr;
+}
+
+static u64 get_desc_src_addr_32(const struct mmp_pdma_desc_hw *desc)
+{
+	return desc->dsadr;
+}
+
+static u64 get_desc_dst_addr_32(const struct mmp_pdma_desc_hw *desc)
+{
+	return desc->dtadr;
+}
+
+/* For 64-bit PDMA */
+static void write_next_addr_64(struct mmp_pdma_phy *phy, dma_addr_t addr)
+{
+	writel(lower_32_bits(addr), phy->base + DDADR(phy->idx));
+	writel(upper_32_bits(addr), phy->base + DDADRH(phy->idx));
+}
+
+static u64 read_src_addr_64(struct mmp_pdma_phy *phy)
+{
+	u32 low = readl(phy->base + DSADR(phy->idx));
+	u32 high = readl(phy->base + DSADRH(phy->idx));
+
+	return ((u64)high << 32) | low;
+}
 
-static void set_desc(struct mmp_pdma_phy *phy, dma_addr_t addr)
+static u64 read_dst_addr_64(struct mmp_pdma_phy *phy)
 {
-	u32 reg = (phy->idx << 4) + DDADR;
+	u32 low = readl(phy->base + DTADR(phy->idx));
+	u32 high = readl(phy->base + DTADRH(phy->idx));
 
-	writel(addr, phy->base + reg);
+	return ((u64)high << 32) | low;
 }
 
+static void set_desc_next_addr_64(struct mmp_pdma_desc_hw *desc, dma_addr_t addr)
+{
+	desc->ddadr = lower_32_bits(addr);
+	desc->ddadrh = upper_32_bits(addr);
+}
+
+static void set_desc_src_addr_64(struct mmp_pdma_desc_hw *desc, dma_addr_t addr)
+{
+	desc->dsadr = lower_32_bits(addr);
+	desc->dsadrh = upper_32_bits(addr);
+}
+
+static void set_desc_dst_addr_64(struct mmp_pdma_desc_hw *desc, dma_addr_t addr)
+{
+	desc->dtadr = lower_32_bits(addr);
+	desc->dtadrh = upper_32_bits(addr);
+}
+
+static u64 get_desc_src_addr_64(const struct mmp_pdma_desc_hw *desc)
+{
+	return ((u64)desc->dsadrh << 32) | desc->dsadr;
+}
+
+static u64 get_desc_dst_addr_64(const struct mmp_pdma_desc_hw *desc)
+{
+	return ((u64)desc->dtadrh << 32) | desc->dtadr;
+}
+
+static int mmp_pdma_config_write(struct dma_chan *dchan,
+				 struct dma_slave_config *cfg,
+				 enum dma_transfer_direction direction);
+
 static void enable_chan(struct mmp_pdma_phy *phy)
 {
 	u32 reg, dalgn;
+	struct mmp_pdma_device *pdev;
 
 	if (!phy->vchan)
 		return;
 
+	pdev = to_mmp_pdma_dev(phy->vchan->chan.device);
+
 	reg = DRCMR(phy->vchan->drcmr);
 	writel(DRCMR_MAPVLD | phy->idx, phy->base + reg);
 
@@ -165,18 +312,29 @@ static void enable_chan(struct mmp_pdma_phy *phy)
 	writel(dalgn, phy->base + DALGN);
 
 	reg = (phy->idx << 2) + DCSR;
-	writel(readl(phy->base + reg) | DCSR_RUN, phy->base + reg);
+	writel(readl(phy->base + reg) | pdev->ops->run_bits,
+	       phy->base + reg);
 }
 
 static void disable_chan(struct mmp_pdma_phy *phy)
 {
-	u32 reg;
+	u32 reg, dcsr;
 
 	if (!phy)
 		return;
 
 	reg = (phy->idx << 2) + DCSR;
-	writel(readl(phy->base + reg) & ~DCSR_RUN, phy->base + reg);
+	dcsr = readl(phy->base + reg);
+
+	if (phy->vchan) {
+		struct mmp_pdma_device *pdev;
+
+		pdev = to_mmp_pdma_dev(phy->vchan->chan.device);
+		writel(dcsr & ~pdev->ops->run_bits, phy->base + reg);
+	} else {
+		/* If no vchan, just clear the RUN bit */
+		writel(dcsr & ~DCSR_RUN, phy->base + reg);
+	}
 }
 
 static int clear_chan_irq(struct mmp_pdma_phy *phy)
@@ -295,6 +453,7 @@ static void mmp_pdma_free_phy(struct mmp_pdma_chan *pchan)
 static void start_pending_queue(struct mmp_pdma_chan *chan)
 {
 	struct mmp_pdma_desc_sw *desc;
+	struct mmp_pdma_device *pdev = to_mmp_pdma_dev(chan->chan.device);
 
 	/* still in running, irq will start the pending list */
 	if (!chan->idle) {
@@ -329,7 +488,7 @@ static void start_pending_queue(struct mmp_pdma_chan *chan)
 	 * Program the descriptor's address into the DMA controller,
 	 * then start the DMA transaction
 	 */
-	set_desc(chan->phy, desc->async_tx.phys);
+	pdev->ops->write_next_addr(chan->phy, desc->async_tx.phys);
 	enable_chan(chan->phy);
 	chan->idle = false;
 }
@@ -445,15 +604,14 @@ mmp_pdma_prep_memcpy(struct dma_chan *dchan,
 		     size_t len, unsigned long flags)
 {
 	struct mmp_pdma_chan *chan;
+	struct mmp_pdma_device *pdev;
 	struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new;
 	size_t copy = 0;
 
-	if (!dchan)
-		return NULL;
-
-	if (!len)
+	if (!dchan || !len)
 		return NULL;
 
+	pdev = to_mmp_pdma_dev(dchan->device);
 	chan = to_mmp_pdma_chan(dchan);
 	chan->byte_align = false;
 
@@ -476,13 +634,14 @@ mmp_pdma_prep_memcpy(struct dma_chan *dchan,
 			chan->byte_align = true;
 
 		new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & copy);
-		new->desc.dsadr = dma_src;
-		new->desc.dtadr = dma_dst;
+		pdev->ops->set_desc_src_addr(&new->desc, dma_src);
+		pdev->ops->set_desc_dst_addr(&new->desc, dma_dst);
 
 		if (!first)
 			first = new;
 		else
-			prev->desc.ddadr = new->async_tx.phys;
+			pdev->ops->set_desc_next_addr(&prev->desc,
+						      new->async_tx.phys);
 
 		new->async_tx.cookie = 0;
 		async_tx_ack(&new->async_tx);
@@ -526,6 +685,7 @@ mmp_pdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
 		       unsigned long flags, void *context)
 {
 	struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
+	struct mmp_pdma_device *pdev = to_mmp_pdma_dev(dchan->device);
 	struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new = NULL;
 	size_t len, avail;
 	struct scatterlist *sg;
@@ -557,17 +717,18 @@ mmp_pdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
 
 			new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & len);
 			if (dir == DMA_MEM_TO_DEV) {
-				new->desc.dsadr = addr;
+				pdev->ops->set_desc_src_addr(&new->desc, addr);
 				new->desc.dtadr = chan->dev_addr;
 			} else {
 				new->desc.dsadr = chan->dev_addr;
-				new->desc.dtadr = addr;
+				pdev->ops->set_desc_dst_addr(&new->desc, addr);
 			}
 
 			if (!first)
 				first = new;
 			else
-				prev->desc.ddadr = new->async_tx.phys;
+				pdev->ops->set_desc_next_addr(&prev->desc,
+							   new->async_tx.phys);
 
 			new->async_tx.cookie = 0;
 			async_tx_ack(&new->async_tx);
@@ -607,12 +768,15 @@ mmp_pdma_prep_dma_cyclic(struct dma_chan *dchan,
 			 unsigned long flags)
 {
 	struct mmp_pdma_chan *chan;
+	struct mmp_pdma_device *pdev;
 	struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new;
 	dma_addr_t dma_src, dma_dst;
 
 	if (!dchan || !len || !period_len)
 		return NULL;
 
+	pdev = to_mmp_pdma_dev(dchan->device);
+
 	/* the buffer length must be a multiple of period_len */
 	if (len % period_len != 0)
 		return NULL;
@@ -649,13 +813,14 @@ mmp_pdma_prep_dma_cyclic(struct dma_chan *dchan,
 
 		new->desc.dcmd = (chan->dcmd | DCMD_ENDIRQEN |
 				  (DCMD_LENGTH & period_len));
-		new->desc.dsadr = dma_src;
-		new->desc.dtadr = dma_dst;
+		pdev->ops->set_desc_src_addr(&new->desc, dma_src);
+		pdev->ops->set_desc_dst_addr(&new->desc, dma_dst);
 
 		if (!first)
 			first = new;
 		else
-			prev->desc.ddadr = new->async_tx.phys;
+			pdev->ops->set_desc_next_addr(&prev->desc,
+						      new->async_tx.phys);
 
 		new->async_tx.cookie = 0;
 		async_tx_ack(&new->async_tx);
@@ -676,7 +841,7 @@ mmp_pdma_prep_dma_cyclic(struct dma_chan *dchan,
 	first->async_tx.cookie = -EBUSY;
 
 	/* make the cyclic link */
-	new->desc.ddadr = first->async_tx.phys;
+	pdev->ops->set_desc_next_addr(&new->desc, first->async_tx.phys);
 	chan->cyclic_first = first;
 
 	return &first->async_tx;
@@ -762,7 +927,9 @@ static unsigned int mmp_pdma_residue(struct mmp_pdma_chan *chan,
 				     dma_cookie_t cookie)
 {
 	struct mmp_pdma_desc_sw *sw;
-	u32 curr, residue = 0;
+	struct mmp_pdma_device *pdev = to_mmp_pdma_dev(chan->chan.device);
+	u64 curr;
+	u32 residue = 0;
 	bool passed = false;
 	bool cyclic = chan->cyclic_first != NULL;
 
@@ -774,17 +941,18 @@ static unsigned int mmp_pdma_residue(struct mmp_pdma_chan *chan,
 		return 0;
 
 	if (chan->dir == DMA_DEV_TO_MEM)
-		curr = readl(chan->phy->base + DTADR(chan->phy->idx));
+		curr = pdev->ops->read_dst_addr(chan->phy);
 	else
-		curr = readl(chan->phy->base + DSADR(chan->phy->idx));
+		curr = pdev->ops->read_src_addr(chan->phy);
 
 	list_for_each_entry(sw, &chan->chain_running, node) {
-		u32 start, end, len;
+		u64 start, end;
+		u32 len;
 
 		if (chan->dir == DMA_DEV_TO_MEM)
-			start = sw->desc.dtadr;
+			start = pdev->ops->get_desc_dst_addr(&sw->desc);
 		else
-			start = sw->desc.dsadr;
+			start = pdev->ops->get_desc_src_addr(&sw->desc);
 
 		len = sw->desc.dcmd & DCMD_LENGTH;
 		end = start + len;
@@ -800,7 +968,7 @@ static unsigned int mmp_pdma_residue(struct mmp_pdma_chan *chan,
 		if (passed) {
 			residue += len;
 		} else if (curr >= start && curr <= end) {
-			residue += end - curr;
+			residue += (u32)(end - curr);
 			passed = true;
 		}
 
@@ -994,9 +1162,42 @@ static int mmp_pdma_chan_init(struct mmp_pdma_device *pdev, int idx, int irq)
 	return 0;
 }
 
+static const struct mmp_pdma_ops marvell_pdma_v1_ops = {
+	.write_next_addr = write_next_addr_32,
+	.read_src_addr = read_src_addr_32,
+	.read_dst_addr = read_dst_addr_32,
+	.set_desc_next_addr = set_desc_next_addr_32,
+	.set_desc_src_addr = set_desc_src_addr_32,
+	.set_desc_dst_addr = set_desc_dst_addr_32,
+	.get_desc_src_addr = get_desc_src_addr_32,
+	.get_desc_dst_addr = get_desc_dst_addr_32,
+	.run_bits = (DCSR_RUN),
+	.dma_mask = 0,			/* let OF/platform set DMA mask */
+};
+
+static const struct mmp_pdma_ops spacemit_k1_pdma_ops = {
+	.write_next_addr = write_next_addr_64,
+	.read_src_addr = read_src_addr_64,
+	.read_dst_addr = read_dst_addr_64,
+	.set_desc_next_addr = set_desc_next_addr_64,
+	.set_desc_src_addr = set_desc_src_addr_64,
+	.set_desc_dst_addr = set_desc_dst_addr_64,
+	.get_desc_src_addr = get_desc_src_addr_64,
+	.get_desc_dst_addr = get_desc_dst_addr_64,
+	.run_bits = (DCSR_RUN | DCSR_LPAEEN),
+	.dma_mask = DMA_BIT_MASK(64),	/* force 64-bit DMA addr capability */
+};
+
 static const struct of_device_id mmp_pdma_dt_ids[] = {
-	{ .compatible = "marvell,pdma-1.0", },
-	{}
+	{
+		.compatible = "marvell,pdma-1.0",
+		.data = &marvell_pdma_v1_ops
+	}, {
+		.compatible = "spacemit,k1-pdma",
+		.data = &spacemit_k1_pdma_ops
+	}, {
+		/* sentinel */
+	}
 };
 MODULE_DEVICE_TABLE(of, mmp_pdma_dt_ids);
 
@@ -1019,6 +1220,8 @@ static int mmp_pdma_probe(struct platform_device *op)
 {
 	struct mmp_pdma_device *pdev;
 	struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev);
+	struct clk *clk;
+	struct reset_control *rst;
 	int i, ret, irq = 0;
 	int dma_channels = 0, irq_num = 0;
 	const enum dma_slave_buswidth widths =
@@ -1037,6 +1240,19 @@ static int mmp_pdma_probe(struct platform_device *op)
 	if (IS_ERR(pdev->base))
 		return PTR_ERR(pdev->base);
 
+	clk = devm_clk_get_optional_enabled(pdev->dev, NULL);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	rst = devm_reset_control_get_optional_exclusive_deasserted(pdev->dev,
+								   NULL);
+	if (IS_ERR(rst))
+		return PTR_ERR(rst);
+
+	pdev->ops = of_device_get_match_data(&op->dev);
+	if (!pdev->ops)
+		return -ENODEV;
+
 	if (pdev->dev->of_node) {
 		/* Parse new and deprecated dma-channels properties */
 		if (of_property_read_u32(pdev->dev->of_node, "dma-channels",
@@ -1098,7 +1314,10 @@ static int mmp_pdma_probe(struct platform_device *op)
 	pdev->device.directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);
 	pdev->device.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
 
-	if (pdev->dev->coherent_dma_mask)
+	/* Set DMA mask based on ops->dma_mask, or OF/platform */
+	if (pdev->ops->dma_mask)
+		dma_set_mask(pdev->dev, pdev->ops->dma_mask);
+	else if (pdev->dev->coherent_dma_mask)
 		dma_set_mask(pdev->dev, pdev->dev->coherent_dma_mask);
 	else
 		dma_set_mask(pdev->dev, DMA_BIT_MASK(64));