drivers/phy/phy-rcar-gen2.c - kernel/msm-4.9 - Gitiles

 /*
  * Renesas R-Car Gen2 PHY driver
  *
  * Copyright (C) 2014 Renesas Solutions Corp.
  * Copyright (C) 2014 Cogent Embedded, Inc.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
 #include <linux/spinlock.h>

 #include <asm/cmpxchg.h>

 #define USBHS_LPSTS			0x02
 #define USBHS_UGCTRL			0x80
 #define USBHS_UGCTRL2			0x84
 #define USBHS_UGSTS			0x88	/* From technical update */

 /* Low Power Status register (LPSTS) */
 #define USBHS_LPSTS_SUSPM		0x4000

 /* USB General control register (UGCTRL) */
 #define USBHS_UGCTRL_CONNECT		0x00000004
 #define USBHS_UGCTRL_PLLRESET		0x00000001

 /* USB General control register 2 (UGCTRL2) */
 #define USBHS_UGCTRL2_USB2SEL		0x80000000
 #define USBHS_UGCTRL2_USB2SEL_PCI	0x00000000
 #define USBHS_UGCTRL2_USB2SEL_USB30	0x80000000
 #define USBHS_UGCTRL2_USB0SEL		0x00000030
 #define USBHS_UGCTRL2_USB0SEL_PCI	0x00000010
 #define USBHS_UGCTRL2_USB0SEL_HS_USB	0x00000030

 /* USB General status register (UGSTS) */
 #define USBHS_UGSTS_LOCK		0x00000100 /* From technical update */

 #define PHYS_PER_CHANNEL	2

 struct rcar_gen2_phy {
 	struct phy *phy;
 	struct rcar_gen2_channel *channel;
 	int number;
 	u32 select_value;
 };

 struct rcar_gen2_channel {
 	struct device_node *of_node;
 	struct rcar_gen2_phy_driver *drv;
 	struct rcar_gen2_phy phys[PHYS_PER_CHANNEL];
 	int selected_phy;
 	u32 select_mask;
 };

 struct rcar_gen2_phy_driver {
 	void __iomem *base;
 	struct clk *clk;
 	spinlock_t lock;
 	int num_channels;
 	struct rcar_gen2_channel *channels;
 };

 static int rcar_gen2_phy_init(struct phy *p)
 {
 	struct rcar_gen2_phy *phy = phy_get_drvdata(p);
 	struct rcar_gen2_channel *channel = phy->channel;
 	struct rcar_gen2_phy_driver *drv = channel->drv;
 	unsigned long flags;
 	u32 ugctrl2;

 	/*
 	 * Try to acquire exclusive access to PHY.  The first driver calling
 	 * phy_init()  on a given channel wins, and all attempts  to use another
 	 * PHY on this channel will fail until phy_exit() is called by the first
 	 * driver.   Achieving this with cmpxcgh() should be SMP-safe.
 	 */
 	if (cmpxchg(&channel->selected_phy, -1, phy->number) != -1)
 		return -EBUSY;

 	clk_prepare_enable(drv->clk);

 	spin_lock_irqsave(&drv->lock, flags);
 	ugctrl2 = readl(drv->base + USBHS_UGCTRL2);
 	ugctrl2 &= ~channel->select_mask;
 	ugctrl2 |= phy->select_value;
 	writel(ugctrl2, drv->base + USBHS_UGCTRL2);
 	spin_unlock_irqrestore(&drv->lock, flags);
 	return 0;
 }

 static int rcar_gen2_phy_exit(struct phy *p)
 {
 	struct rcar_gen2_phy *phy = phy_get_drvdata(p);
 	struct rcar_gen2_channel *channel = phy->channel;

 	clk_disable_unprepare(channel->drv->clk);

 	channel->selected_phy = -1;

 	return 0;
 }

 static int rcar_gen2_phy_power_on(struct phy *p)
 {
 	struct rcar_gen2_phy *phy = phy_get_drvdata(p);
 	struct rcar_gen2_phy_driver *drv = phy->channel->drv;
 	void __iomem *base = drv->base;
 	unsigned long flags;
 	u32 value;
 	int err = 0, i;

 	/* Skip if it's not USBHS */
 	if (phy->select_value != USBHS_UGCTRL2_USB0SEL_HS_USB)
 		return 0;

 	spin_lock_irqsave(&drv->lock, flags);

 	/* Power on USBHS PHY */
 	value = readl(base + USBHS_UGCTRL);
 	value &= ~USBHS_UGCTRL_PLLRESET;
 	writel(value, base + USBHS_UGCTRL);

 	value = readw(base + USBHS_LPSTS);
 	value |= USBHS_LPSTS_SUSPM;
 	writew(value, base + USBHS_LPSTS);

 	for (i = 0; i < 20; i++) {
 		value = readl(base + USBHS_UGSTS);
 		if ((value & USBHS_UGSTS_LOCK) == USBHS_UGSTS_LOCK) {
 			value = readl(base + USBHS_UGCTRL);
 			value |= USBHS_UGCTRL_CONNECT;
 			writel(value, base + USBHS_UGCTRL);
 			goto out;
 		}
 		udelay(1);
 	}

 	/* Timed out waiting for the PLL lock */
 	err = -ETIMEDOUT;

 out:
 	spin_unlock_irqrestore(&drv->lock, flags);

 	return err;
 }

 static int rcar_gen2_phy_power_off(struct phy *p)
 {
 	struct rcar_gen2_phy *phy = phy_get_drvdata(p);
 	struct rcar_gen2_phy_driver *drv = phy->channel->drv;
 	void __iomem *base = drv->base;
 	unsigned long flags;
 	u32 value;

 	/* Skip if it's not USBHS */
 	if (phy->select_value != USBHS_UGCTRL2_USB0SEL_HS_USB)
 		return 0;

 	spin_lock_irqsave(&drv->lock, flags);

 	/* Power off USBHS PHY */
 	value = readl(base + USBHS_UGCTRL);
 	value &= ~USBHS_UGCTRL_CONNECT;
 	writel(value, base + USBHS_UGCTRL);

 	value = readw(base + USBHS_LPSTS);
 	value &= ~USBHS_LPSTS_SUSPM;
 	writew(value, base + USBHS_LPSTS);

 	value = readl(base + USBHS_UGCTRL);
 	value |= USBHS_UGCTRL_PLLRESET;
 	writel(value, base + USBHS_UGCTRL);

 	spin_unlock_irqrestore(&drv->lock, flags);

 	return 0;
 }

 static struct phy_ops rcar_gen2_phy_ops = {
 	.init		= rcar_gen2_phy_init,
 	.exit		= rcar_gen2_phy_exit,
 	.power_on	= rcar_gen2_phy_power_on,
 	.power_off	= rcar_gen2_phy_power_off,
 	.owner		= THIS_MODULE,
 };

 static const struct of_device_id rcar_gen2_phy_match_table[] = {
 	{ .compatible = "renesas,usb-phy-r8a7790" },
 	{ .compatible = "renesas,usb-phy-r8a7791" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, rcar_gen2_phy_match_table);

 static struct phy *rcar_gen2_phy_xlate(struct device *dev,
 				       struct of_phandle_args *args)
 {
 	struct rcar_gen2_phy_driver *drv;
 	struct device_node *np = args->np;
 	int i;

 	if (!of_device_is_available(np)) {
 		dev_warn(dev, "Requested PHY is disabled\n");
 		return ERR_PTR(-ENODEV);
 	}

 	drv = dev_get_drvdata(dev);
 	if (!drv)
 		return ERR_PTR(-EINVAL);

 	for (i = 0; i < drv->num_channels; i++) {
 		if (np == drv->channels[i].of_node)
 			break;
 	}

 	if (i >= drv->num_channels || args->args[0] >= 2)
 		return ERR_PTR(-ENODEV);

 	return drv->channels[i].phys[args->args[0]].phy;
 }

 static const u32 select_mask[] = {
 	[0]	= USBHS_UGCTRL2_USB0SEL,
 	[2]	= USBHS_UGCTRL2_USB2SEL,
 };

 static const u32 select_value[][PHYS_PER_CHANNEL] = {
 	[0]	= { USBHS_UGCTRL2_USB0SEL_PCI, USBHS_UGCTRL2_USB0SEL_HS_USB },
 	[2]	= { USBHS_UGCTRL2_USB2SEL_PCI, USBHS_UGCTRL2_USB2SEL_USB30 },
 };

 static int rcar_gen2_phy_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct rcar_gen2_phy_driver *drv;
 	struct phy_provider *provider;
 	struct device_node *np;
 	struct resource *res;
 	void __iomem *base;
 	struct clk *clk;
 	int i = 0;

 	if (!dev->of_node) {
 		dev_err(dev,
 			"This driver is required to be instantiated from device tree\n");
 		return -EINVAL;
 	}

 	clk = devm_clk_get(dev, "usbhs");
 	if (IS_ERR(clk)) {
 		dev_err(dev, "Can't get USBHS clock\n");
 		return PTR_ERR(clk);
 	}

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(base))
 		return PTR_ERR(base);

 	drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
 	if (!drv)
 		return -ENOMEM;

 	spin_lock_init(&drv->lock);

 	drv->clk = clk;
 	drv->base = base;

 	drv->num_channels = of_get_child_count(dev->of_node);
 	drv->channels = devm_kcalloc(dev, drv->num_channels,
 				     sizeof(struct rcar_gen2_channel),
 				     GFP_KERNEL);
 	if (!drv->channels)
 		return -ENOMEM;

 	for_each_child_of_node(dev->of_node, np) {
 		struct rcar_gen2_channel *channel = drv->channels + i;
 		u32 channel_num;
 		int error, n;

 		channel->of_node = np;
 		channel->drv = drv;
 		channel->selected_phy = -1;

 		error = of_property_read_u32(np, "reg", &channel_num);
 		if (error || channel_num > 2) {
 			dev_err(dev, "Invalid \"reg\" property\n");
 			return error;
 		}
 		channel->select_mask = select_mask[channel_num];

 		for (n = 0; n < PHYS_PER_CHANNEL; n++) {
 			struct rcar_gen2_phy *phy = &channel->phys[n];

 			phy->channel = channel;
 			phy->number = n;
 			phy->select_value = select_value[channel_num][n];

 			phy->phy = devm_phy_create(dev, NULL,
 						   &rcar_gen2_phy_ops);
 			if (IS_ERR(phy->phy)) {
 				dev_err(dev, "Failed to create PHY\n");
 				return PTR_ERR(phy->phy);
 			}
 			phy_set_drvdata(phy->phy, phy);
 		}

 		i++;
 	}

 	provider = devm_of_phy_provider_register(dev, rcar_gen2_phy_xlate);
 	if (IS_ERR(provider)) {
 		dev_err(dev, "Failed to register PHY provider\n");
 		return PTR_ERR(provider);
 	}

 	dev_set_drvdata(dev, drv);

 	return 0;
 }

 static struct platform_driver rcar_gen2_phy_driver = {
 	.driver = {
 		.name		= "phy_rcar_gen2",
 		.of_match_table	= rcar_gen2_phy_match_table,
 	},
 	.probe	= rcar_gen2_phy_probe,
 };

 module_platform_driver(rcar_gen2_phy_driver);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("Renesas R-Car Gen2 PHY");
 MODULE_AUTHOR("Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>");
	/*
	* Renesas R-Car Gen2 PHY driver
	*
	* Copyright (C) 2014 Renesas Solutions Corp.
	* Copyright (C) 2014 Cogent Embedded, Inc.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/clk.h>
	#include <linux/delay.h>
	#include <linux/io.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/phy/phy.h>
	#include <linux/platform_device.h>
	#include <linux/spinlock.h>

	#include <asm/cmpxchg.h>

	#define USBHS_LPSTS 0x02
	#define USBHS_UGCTRL 0x80
	#define USBHS_UGCTRL2 0x84
	#define USBHS_UGSTS 0x88 /* From technical update */

	/* Low Power Status register (LPSTS) */
	#define USBHS_LPSTS_SUSPM 0x4000

	/* USB General control register (UGCTRL) */
	#define USBHS_UGCTRL_CONNECT 0x00000004
	#define USBHS_UGCTRL_PLLRESET 0x00000001

	/* USB General control register 2 (UGCTRL2) */
	#define USBHS_UGCTRL2_USB2SEL 0x80000000
	#define USBHS_UGCTRL2_USB2SEL_PCI 0x00000000
	#define USBHS_UGCTRL2_USB2SEL_USB30 0x80000000
	#define USBHS_UGCTRL2_USB0SEL 0x00000030
	#define USBHS_UGCTRL2_USB0SEL_PCI 0x00000010
	#define USBHS_UGCTRL2_USB0SEL_HS_USB 0x00000030

	/* USB General status register (UGSTS) */
	#define USBHS_UGSTS_LOCK 0x00000100 /* From technical update */

	#define PHYS_PER_CHANNEL 2

	struct rcar_gen2_phy {
	struct phy *phy;
	struct rcar_gen2_channel *channel;
	int number;
	u32 select_value;
	};

	struct rcar_gen2_channel {
	struct device_node *of_node;
	struct rcar_gen2_phy_driver *drv;
	struct rcar_gen2_phy phys[PHYS_PER_CHANNEL];
	int selected_phy;
	u32 select_mask;
	};

	struct rcar_gen2_phy_driver {
	void __iomem *base;
	struct clk *clk;
	spinlock_t lock;
	int num_channels;
	struct rcar_gen2_channel *channels;
	};

	static int rcar_gen2_phy_init(struct phy *p)
	{
	struct rcar_gen2_phy *phy = phy_get_drvdata(p);
	struct rcar_gen2_channel *channel = phy->channel;
	struct rcar_gen2_phy_driver *drv = channel->drv;
	unsigned long flags;
	u32 ugctrl2;

	/*
	* Try to acquire exclusive access to PHY. The first driver calling
	* phy_init() on a given channel wins, and all attempts to use another
	* PHY on this channel will fail until phy_exit() is called by the first
	* driver. Achieving this with cmpxcgh() should be SMP-safe.
	*/
	if (cmpxchg(&channel->selected_phy, -1, phy->number) != -1)
	return -EBUSY;

	clk_prepare_enable(drv->clk);

	spin_lock_irqsave(&drv->lock, flags);
	ugctrl2 = readl(drv->base + USBHS_UGCTRL2);
	ugctrl2 &= ~channel->select_mask;
	ugctrl2 \|= phy->select_value;
	writel(ugctrl2, drv->base + USBHS_UGCTRL2);
	spin_unlock_irqrestore(&drv->lock, flags);
	return 0;
	}

	static int rcar_gen2_phy_exit(struct phy *p)
	{
	struct rcar_gen2_phy *phy = phy_get_drvdata(p);
	struct rcar_gen2_channel *channel = phy->channel;

	clk_disable_unprepare(channel->drv->clk);

	channel->selected_phy = -1;

	return 0;
	}

	static int rcar_gen2_phy_power_on(struct phy *p)
	{
	struct rcar_gen2_phy *phy = phy_get_drvdata(p);
	struct rcar_gen2_phy_driver *drv = phy->channel->drv;
	void __iomem *base = drv->base;
	unsigned long flags;
	u32 value;
	int err = 0, i;

	/* Skip if it's not USBHS */
	if (phy->select_value != USBHS_UGCTRL2_USB0SEL_HS_USB)
	return 0;

	spin_lock_irqsave(&drv->lock, flags);

	/* Power on USBHS PHY */
	value = readl(base + USBHS_UGCTRL);
	value &= ~USBHS_UGCTRL_PLLRESET;
	writel(value, base + USBHS_UGCTRL);

	value = readw(base + USBHS_LPSTS);
	value \|= USBHS_LPSTS_SUSPM;
	writew(value, base + USBHS_LPSTS);

	for (i = 0; i < 20; i++) {
	value = readl(base + USBHS_UGSTS);
	if ((value & USBHS_UGSTS_LOCK) == USBHS_UGSTS_LOCK) {
	value = readl(base + USBHS_UGCTRL);
	value \|= USBHS_UGCTRL_CONNECT;
	writel(value, base + USBHS_UGCTRL);
	goto out;
	}
	udelay(1);
	}

	/* Timed out waiting for the PLL lock */
	err = -ETIMEDOUT;

	out:
	spin_unlock_irqrestore(&drv->lock, flags);

	return err;
	}

	static int rcar_gen2_phy_power_off(struct phy *p)
	{
	struct rcar_gen2_phy *phy = phy_get_drvdata(p);
	struct rcar_gen2_phy_driver *drv = phy->channel->drv;
	void __iomem *base = drv->base;
	unsigned long flags;
	u32 value;

	/* Skip if it's not USBHS */
	if (phy->select_value != USBHS_UGCTRL2_USB0SEL_HS_USB)
	return 0;

	spin_lock_irqsave(&drv->lock, flags);

	/* Power off USBHS PHY */
	value = readl(base + USBHS_UGCTRL);
	value &= ~USBHS_UGCTRL_CONNECT;
	writel(value, base + USBHS_UGCTRL);

	value = readw(base + USBHS_LPSTS);
	value &= ~USBHS_LPSTS_SUSPM;
	writew(value, base + USBHS_LPSTS);

	value = readl(base + USBHS_UGCTRL);
	value \|= USBHS_UGCTRL_PLLRESET;
	writel(value, base + USBHS_UGCTRL);

	spin_unlock_irqrestore(&drv->lock, flags);

	return 0;
	}

	static struct phy_ops rcar_gen2_phy_ops = {
	.init = rcar_gen2_phy_init,
	.exit = rcar_gen2_phy_exit,
	.power_on = rcar_gen2_phy_power_on,
	.power_off = rcar_gen2_phy_power_off,
	.owner = THIS_MODULE,
	};

	static const struct of_device_id rcar_gen2_phy_match_table[] = {
	{ .compatible = "renesas,usb-phy-r8a7790" },
	{ .compatible = "renesas,usb-phy-r8a7791" },
	{ }
	};
	MODULE_DEVICE_TABLE(of, rcar_gen2_phy_match_table);

	static struct phy rcar_gen2_phy_xlate(struct device dev,
	struct of_phandle_args *args)
	{
	struct rcar_gen2_phy_driver *drv;
	struct device_node *np = args->np;
	int i;

	if (!of_device_is_available(np)) {
	dev_warn(dev, "Requested PHY is disabled\n");
	return ERR_PTR(-ENODEV);
	}

	drv = dev_get_drvdata(dev);
	if (!drv)
	return ERR_PTR(-EINVAL);

	for (i = 0; i < drv->num_channels; i++) {
	if (np == drv->channels[i].of_node)
	break;
	}

	if (i >= drv->num_channels \|\| args->args[0] >= 2)
	return ERR_PTR(-ENODEV);

	return drv->channels[i].phys[args->args[0]].phy;
	}

	static const u32 select_mask[] = {
	[0] = USBHS_UGCTRL2_USB0SEL,
	[2] = USBHS_UGCTRL2_USB2SEL,
	};

	static const u32 select_value[][PHYS_PER_CHANNEL] = {
	[0] = { USBHS_UGCTRL2_USB0SEL_PCI, USBHS_UGCTRL2_USB0SEL_HS_USB },
	[2] = { USBHS_UGCTRL2_USB2SEL_PCI, USBHS_UGCTRL2_USB2SEL_USB30 },
	};

	static int rcar_gen2_phy_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct rcar_gen2_phy_driver *drv;
	struct phy_provider *provider;
	struct device_node *np;
	struct resource *res;
	void __iomem *base;
	struct clk *clk;
	int i = 0;

	if (!dev->of_node) {
	dev_err(dev,
	"This driver is required to be instantiated from device tree\n");
	return -EINVAL;
	}

	clk = devm_clk_get(dev, "usbhs");
	if (IS_ERR(clk)) {
	dev_err(dev, "Can't get USBHS clock\n");
	return PTR_ERR(clk);
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	base = devm_ioremap_resource(dev, res);
	if (IS_ERR(base))
	return PTR_ERR(base);

	drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
	if (!drv)
	return -ENOMEM;

	spin_lock_init(&drv->lock);

	drv->clk = clk;
	drv->base = base;

	drv->num_channels = of_get_child_count(dev->of_node);
	drv->channels = devm_kcalloc(dev, drv->num_channels,
	sizeof(struct rcar_gen2_channel),
	GFP_KERNEL);
	if (!drv->channels)
	return -ENOMEM;

	for_each_child_of_node(dev->of_node, np) {
	struct rcar_gen2_channel *channel = drv->channels + i;
	u32 channel_num;
	int error, n;

	channel->of_node = np;
	channel->drv = drv;
	channel->selected_phy = -1;

	error = of_property_read_u32(np, "reg", &channel_num);
	if (error \|\| channel_num > 2) {
	dev_err(dev, "Invalid \"reg\" property\n");
	return error;
	}
	channel->select_mask = select_mask[channel_num];

	for (n = 0; n < PHYS_PER_CHANNEL; n++) {
	struct rcar_gen2_phy *phy = &channel->phys[n];

	phy->channel = channel;
	phy->number = n;
	phy->select_value = select_value[channel_num][n];

	phy->phy = devm_phy_create(dev, NULL,
	&rcar_gen2_phy_ops);
	if (IS_ERR(phy->phy)) {
	dev_err(dev, "Failed to create PHY\n");
	return PTR_ERR(phy->phy);
	}
	phy_set_drvdata(phy->phy, phy);
	}

	i++;
	}

	provider = devm_of_phy_provider_register(dev, rcar_gen2_phy_xlate);
	if (IS_ERR(provider)) {
	dev_err(dev, "Failed to register PHY provider\n");
	return PTR_ERR(provider);
	}

	dev_set_drvdata(dev, drv);

	return 0;
	}

	static struct platform_driver rcar_gen2_phy_driver = {
	.driver = {
	.name = "phy_rcar_gen2",
	.of_match_table = rcar_gen2_phy_match_table,
	},
	.probe = rcar_gen2_phy_probe,
	};

	module_platform_driver(rcar_gen2_phy_driver);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("Renesas R-Car Gen2 PHY");
	MODULE_AUTHOR("Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>");