1 files changed, 118 insertions, 74 deletions

diff --git a/drivers/net/ethernet/marvell/mvmdio.c b/drivers/net/ethernet/marvell/mvmdio.c
index c5dac6bd2be4..3f4447e68888 100644
--- a/drivers/net/ethernet/marvell/mvmdio.c
+++ b/drivers/net/ethernet/marvell/mvmdio.c
@@ -17,13 +17,16 @@
  * warranty of any kind, whether express or implied.
  */
 
+#include <linux/acpi.h>
+#include <linux/acpi_mdio.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
 #include <linux/module.h>
-#include <linux/of_device.h>
 #include <linux/of_mdio.h>
 #include <linux/phy.h>
 #include <linux/platform_device.h>
@@ -50,21 +53,23 @@
 #define  MVMDIO_XSMI_BUSY		BIT(30)
 #define MVMDIO_XSMI_ADDR_REG		0x8
 
+#define MVMDIO_XSMI_CFG_REG		0xc
+#define  MVMDIO_XSMI_CLKDIV_MASK	0x3
+#define  MVMDIO_XSMI_CLKDIV_256		0x0
+#define  MVMDIO_XSMI_CLKDIV_64		0x1
+#define  MVMDIO_XSMI_CLKDIV_32		0x2
+#define  MVMDIO_XSMI_CLKDIV_8		0x3
+
 /*
  * SMI Timeout measurements:
  * - Kirkwood 88F6281 (Globalscale Dreamplug): 45us to 95us (Interrupt)
  * - Armada 370       (Globalscale Mirabox):   41us to 43us (Polled)
  */
 #define MVMDIO_SMI_TIMEOUT		1000 /* 1000us = 1ms */
-#define MVMDIO_SMI_POLL_INTERVAL_MIN	45
-#define MVMDIO_SMI_POLL_INTERVAL_MAX	55
-
-#define MVMDIO_XSMI_POLL_INTERVAL_MIN	150
-#define MVMDIO_XSMI_POLL_INTERVAL_MAX	160
 
 struct orion_mdio_dev {
 	void __iomem *regs;
-	struct clk *clk[3];
+	struct clk *clk[4];
 	/*
 	 * If we have access to the error interrupt pin (which is
 	 * somewhat misnamed as it not only reflects internal errors
@@ -82,8 +87,6 @@ enum orion_mdio_bus_type {
 
 struct orion_mdio_ops {
 	int (*is_done)(struct orion_mdio_dev *);
-	unsigned int poll_interval_min;
-	unsigned int poll_interval_max;
 };
 
 /* Wait for the SMI unit to be ready for another operation
@@ -92,34 +95,23 @@ static int orion_mdio_wait_ready(const struct orion_mdio_ops *ops,
 				 struct mii_bus *bus)
 {
 	struct orion_mdio_dev *dev = bus->priv;
-	unsigned long timeout = usecs_to_jiffies(MVMDIO_SMI_TIMEOUT);
-	unsigned long end = jiffies + timeout;
-	int timedout = 0;
+	unsigned long timeout;
+	int done;
 
-	while (1) {
-	        if (ops->is_done(dev))
+	if (dev->err_interrupt <= 0) {
+		if (!read_poll_timeout_atomic(ops->is_done, done, done, 2,
+					      MVMDIO_SMI_TIMEOUT, false, dev))
+			return 0;
+	} else {
+		/* wait_event_timeout does not guarantee a delay of at
+		 * least one whole jiffy, so timeout must be no less
+		 * than two.
+		 */
+		timeout = max(usecs_to_jiffies(MVMDIO_SMI_TIMEOUT), 2);
+
+		if (wait_event_timeout(dev->smi_busy_wait,
+				       ops->is_done(dev), timeout))
 			return 0;
-	        else if (timedout)
-			break;
-
-	        if (dev->err_interrupt <= 0) {
-			usleep_range(ops->poll_interval_min,
-				     ops->poll_interval_max);
-
-			if (time_is_before_jiffies(end))
-				++timedout;
-	        } else {
-			/* wait_event_timeout does not guarantee a delay of at
-			 * least one whole jiffie, so timeout must be no less
-			 * than two.
-			 */
-			if (timeout < 2)
-				timeout = 2;
-			wait_event_timeout(dev->smi_busy_wait,
-				           ops->is_done(dev), timeout);
-
-			++timedout;
-	        }
 	}
 
 	dev_err(bus->parent, "Timeout: SMI busy for too long\n");
@@ -133,8 +125,6 @@ static int orion_mdio_smi_is_done(struct orion_mdio_dev *dev)
 
 static const struct orion_mdio_ops orion_mdio_smi_ops = {
 	.is_done = orion_mdio_smi_is_done,
-	.poll_interval_min = MVMDIO_SMI_POLL_INTERVAL_MIN,
-	.poll_interval_max = MVMDIO_SMI_POLL_INTERVAL_MAX,
 };
 
 static int orion_mdio_smi_read(struct mii_bus *bus, int mii_id,
@@ -144,9 +134,6 @@ static int orion_mdio_smi_read(struct mii_bus *bus, int mii_id,
 	u32 val;
 	int ret;
 
-	if (regnum & MII_ADDR_C45)
-		return -EOPNOTSUPP;
-
 	ret = orion_mdio_wait_ready(&orion_mdio_smi_ops, bus);
 	if (ret < 0)
 		return ret;
@@ -175,9 +162,6 @@ static int orion_mdio_smi_write(struct mii_bus *bus, int mii_id,
 	struct orion_mdio_dev *dev = bus->priv;
 	int ret;
 
-	if (regnum & MII_ADDR_C45)
-		return -EOPNOTSUPP;
-
 	ret = orion_mdio_wait_ready(&orion_mdio_smi_ops, bus);
 	if (ret < 0)
 		return ret;
@@ -198,25 +182,19 @@ static int orion_mdio_xsmi_is_done(struct orion_mdio_dev *dev)
 
 static const struct orion_mdio_ops orion_mdio_xsmi_ops = {
 	.is_done = orion_mdio_xsmi_is_done,
-	.poll_interval_min = MVMDIO_XSMI_POLL_INTERVAL_MIN,
-	.poll_interval_max = MVMDIO_XSMI_POLL_INTERVAL_MAX,
 };
 
-static int orion_mdio_xsmi_read(struct mii_bus *bus, int mii_id,
-				int regnum)
+static int orion_mdio_xsmi_read_c45(struct mii_bus *bus, int mii_id,
+				    int dev_addr, int regnum)
 {
 	struct orion_mdio_dev *dev = bus->priv;
-	u16 dev_addr = (regnum >> 16) & GENMASK(4, 0);
 	int ret;
 
-	if (!(regnum & MII_ADDR_C45))
-		return -EOPNOTSUPP;
-
 	ret = orion_mdio_wait_ready(&orion_mdio_xsmi_ops, bus);
 	if (ret < 0)
 		return ret;
 
-	writel(regnum & GENMASK(15, 0), dev->regs + MVMDIO_XSMI_ADDR_REG);
+	writel(regnum, dev->regs + MVMDIO_XSMI_ADDR_REG);
 	writel((mii_id << MVMDIO_XSMI_PHYADDR_SHIFT) |
 	       (dev_addr << MVMDIO_XSMI_DEVADDR_SHIFT) |
 	       MVMDIO_XSMI_READ_OPERATION,
@@ -235,21 +213,17 @@ static int orion_mdio_xsmi_read(struct mii_bus *bus, int mii_id,
 	return readl(dev->regs + MVMDIO_XSMI_MGNT_REG) & GENMASK(15, 0);
 }
 
-static int orion_mdio_xsmi_write(struct mii_bus *bus, int mii_id,
-				int regnum, u16 value)
+static int orion_mdio_xsmi_write_c45(struct mii_bus *bus, int mii_id,
+				     int dev_addr, int regnum, u16 value)
 {
 	struct orion_mdio_dev *dev = bus->priv;
-	u16 dev_addr = (regnum >> 16) & GENMASK(4, 0);
 	int ret;
 
-	if (!(regnum & MII_ADDR_C45))
-		return -EOPNOTSUPP;
-
 	ret = orion_mdio_wait_ready(&orion_mdio_xsmi_ops, bus);
 	if (ret < 0)
 		return ret;
 
-	writel(regnum & GENMASK(15, 0), dev->regs + MVMDIO_XSMI_ADDR_REG);
+	writel(regnum, dev->regs + MVMDIO_XSMI_ADDR_REG);
 	writel((mii_id << MVMDIO_XSMI_PHYADDR_SHIFT) |
 	       (dev_addr << MVMDIO_XSMI_DEVADDR_SHIFT) |
 	       MVMDIO_XSMI_WRITE_OPERATION | value,
@@ -258,6 +232,40 @@ static int orion_mdio_xsmi_write(struct mii_bus *bus, int mii_id,
 	return 0;
 }
 
+static void orion_mdio_xsmi_set_mdc_freq(struct mii_bus *bus)
+{
+	struct orion_mdio_dev *dev = bus->priv;
+	struct clk *mg_core;
+	u32 div, freq, cfg;
+
+	if (device_property_read_u32(bus->parent, "clock-frequency", &freq))
+		return;
+
+	mg_core = of_clk_get_by_name(bus->parent->of_node, "mg_core_clk");
+	if (IS_ERR(mg_core)) {
+		dev_err(bus->parent,
+			"MG core clock unknown, not changing MDC frequency");
+		return;
+	}
+
+	div = clk_get_rate(mg_core) / (freq + 1) + 1;
+	clk_put(mg_core);
+
+	if (div <= 8)
+		div = MVMDIO_XSMI_CLKDIV_8;
+	else if (div <= 32)
+		div = MVMDIO_XSMI_CLKDIV_32;
+	else if (div <= 64)
+		div = MVMDIO_XSMI_CLKDIV_64;
+	else
+		div = MVMDIO_XSMI_CLKDIV_256;
+
+	cfg = readl(dev->regs + MVMDIO_XSMI_CFG_REG);
+	cfg &= ~MVMDIO_XSMI_CLKDIV_MASK;
+	cfg |= div;
+	writel(cfg, dev->regs + MVMDIO_XSMI_CFG_REG);
+}
+
 static irqreturn_t orion_mdio_err_irq(int irq, void *dev_id)
 {
 	struct orion_mdio_dev *dev = dev_id;
@@ -281,7 +289,7 @@ static int orion_mdio_probe(struct platform_device *pdev)
 	struct orion_mdio_dev *dev;
 	int i, ret;
 
-	type = (enum orion_mdio_bus_type)of_device_get_match_data(&pdev->dev);
+	type = (uintptr_t)device_get_match_data(&pdev->dev);
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!r) {
@@ -300,8 +308,8 @@ static int orion_mdio_probe(struct platform_device *pdev)
 		bus->write = orion_mdio_smi_write;
 		break;
 	case BUS_TYPE_XSMI:
-		bus->read = orion_mdio_xsmi_read;
-		bus->write = orion_mdio_xsmi_write;
+		bus->read_c45 = orion_mdio_xsmi_read_c45;
+		bus->write_c45 = orion_mdio_xsmi_write_c45;
 		break;
 	}
 
@@ -319,14 +327,37 @@ static int orion_mdio_probe(struct platform_device *pdev)
 
 	init_waitqueue_head(&dev->smi_busy_wait);
 
-	for (i = 0; i < ARRAY_SIZE(dev->clk); i++) {
-		dev->clk[i] = of_clk_get(pdev->dev.of_node, i);
-		if (IS_ERR(dev->clk[i]))
-			break;
-		clk_prepare_enable(dev->clk[i]);
+	if (pdev->dev.of_node) {
+		for (i = 0; i < ARRAY_SIZE(dev->clk); i++) {
+			dev->clk[i] = of_clk_get(pdev->dev.of_node, i);
+			if (PTR_ERR(dev->clk[i]) == -EPROBE_DEFER) {
+				ret = -EPROBE_DEFER;
+				goto out_clk;
+			}
+			if (IS_ERR(dev->clk[i]))
+				break;
+			clk_prepare_enable(dev->clk[i]);
+		}
+
+		if (!IS_ERR(of_clk_get(pdev->dev.of_node,
+				       ARRAY_SIZE(dev->clk))))
+			dev_warn(&pdev->dev,
+				 "unsupported number of clocks, limiting to the first "
+				 __stringify(ARRAY_SIZE(dev->clk)) "\n");
+
+		if (type == BUS_TYPE_XSMI)
+			orion_mdio_xsmi_set_mdc_freq(bus);
+	} else {
+		dev->clk[0] = clk_get_optional(&pdev->dev, NULL);
+		if (IS_ERR(dev->clk[0])) {
+			ret = PTR_ERR(dev->clk[0]);
+			goto out_clk;
+		}
+		clk_prepare_enable(dev->clk[0]);
 	}
 
-	dev->err_interrupt = platform_get_irq(pdev, 0);
+
+	dev->err_interrupt = platform_get_irq_optional(pdev, 0);
 	if (dev->err_interrupt > 0 &&
 	    resource_size(r) < MVMDIO_ERR_INT_MASK + 4) {
 		dev_err(&pdev->dev,
@@ -348,7 +379,13 @@ static int orion_mdio_probe(struct platform_device *pdev)
 		goto out_mdio;
 	}
 
-	ret = of_mdiobus_register(bus, pdev->dev.of_node);
+	/* For the platforms not supporting DT/ACPI fall-back
+	 * to mdiobus_register via of_mdiobus_register.
+	 */
+	if (is_acpi_node(pdev->dev.fwnode))
+		ret = acpi_mdiobus_register(bus, pdev->dev.fwnode);
+	else
+		ret = of_mdiobus_register(bus, pdev->dev.of_node);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Cannot register MDIO bus (%d)\n", ret);
 		goto out_mdio;
@@ -362,6 +399,7 @@ out_mdio:
 	if (dev->err_interrupt > 0)
 		writel(0, dev->regs + MVMDIO_ERR_INT_MASK);
 
+out_clk:
 	for (i = 0; i < ARRAY_SIZE(dev->clk); i++) {
 		if (IS_ERR(dev->clk[i]))
 			break;
@@ -372,7 +410,7 @@ out_mdio:
 	return ret;
 }
 
-static int orion_mdio_remove(struct platform_device *pdev)
+static void orion_mdio_remove(struct platform_device *pdev)
 {
 	struct mii_bus *bus = platform_get_drvdata(pdev);
 	struct orion_mdio_dev *dev = bus->priv;
@@ -383,13 +421,9 @@ static int orion_mdio_remove(struct platform_device *pdev)
 	mdiobus_unregister(bus);
 
 	for (i = 0; i < ARRAY_SIZE(dev->clk); i++) {
-		if (IS_ERR(dev->clk[i]))
-			break;
 		clk_disable_unprepare(dev->clk[i]);
 		clk_put(dev->clk[i]);
 	}
-
-	return 0;
 }
 
 static const struct of_device_id orion_mdio_match[] = {
@@ -399,12 +433,22 @@ static const struct of_device_id orion_mdio_match[] = {
 };
 MODULE_DEVICE_TABLE(of, orion_mdio_match);
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id orion_mdio_acpi_match[] = {
+	{ "MRVL0100", BUS_TYPE_SMI },
+	{ "MRVL0101", BUS_TYPE_XSMI },
+	{ },
+};
+MODULE_DEVICE_TABLE(acpi, orion_mdio_acpi_match);
+#endif
+
 static struct platform_driver orion_mdio_driver = {
 	.probe = orion_mdio_probe,
 	.remove = orion_mdio_remove,
 	.driver = {
 		.name = "orion-mdio",
 		.of_match_table = orion_mdio_match,
+		.acpi_match_table = ACPI_PTR(orion_mdio_acpi_match),
 	},
 };