drivers/phy/phy-rcar-gen3-usb2.c - third_party/linux - Git at Google

 /*
  * Renesas R-Car Gen3 for USB2.0 PHY driver
  *
  * Copyright (C) 2015 Renesas Electronics Corporation
  *
  * This is based on the phy-rcar-gen2 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/extcon.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>
 #include <linux/workqueue.h>

 /******* USB2.0 Host registers (original offset is +0x200) *******/
 #define USB2_INT_ENABLE		0x000
 #define USB2_USBCTR		0x00c
 #define USB2_SPD_RSM_TIMSET	0x10c
 #define USB2_OC_TIMSET		0x110
 #define USB2_COMMCTRL		0x600
 #define USB2_OBINTSTA		0x604
 #define USB2_OBINTEN		0x608
 #define USB2_VBCTRL		0x60c
 #define USB2_LINECTRL1		0x610
 #define USB2_ADPCTRL		0x630

 /* INT_ENABLE */
 #define USB2_INT_ENABLE_UCOM_INTEN	BIT(3)
 #define USB2_INT_ENABLE_USBH_INTB_EN	BIT(2)
 #define USB2_INT_ENABLE_USBH_INTA_EN	BIT(1)
 #define USB2_INT_ENABLE_INIT		(USB2_INT_ENABLE_UCOM_INTEN | \
 					 USB2_INT_ENABLE_USBH_INTB_EN | \
 					 USB2_INT_ENABLE_USBH_INTA_EN)

 /* USBCTR */
 #define USB2_USBCTR_DIRPD	BIT(2)
 #define USB2_USBCTR_PLL_RST	BIT(1)

 /* SPD_RSM_TIMSET */
 #define USB2_SPD_RSM_TIMSET_INIT	0x014e029b

 /* OC_TIMSET */
 #define USB2_OC_TIMSET_INIT		0x000209ab

 /* COMMCTRL */
 #define USB2_COMMCTRL_OTG_PERI		BIT(31)	/* 1 = Peripheral mode */

 /* OBINTSTA and OBINTEN */
 #define USB2_OBINT_SESSVLDCHG		BIT(12)
 #define USB2_OBINT_IDDIGCHG		BIT(11)
 #define USB2_OBINT_BITS			(USB2_OBINT_SESSVLDCHG | \
 					 USB2_OBINT_IDDIGCHG)

 /* VBCTRL */
 #define USB2_VBCTRL_DRVVBUSSEL		BIT(8)

 /* LINECTRL1 */
 #define USB2_LINECTRL1_DPRPD_EN		BIT(19)
 #define USB2_LINECTRL1_DP_RPD		BIT(18)
 #define USB2_LINECTRL1_DMRPD_EN		BIT(17)
 #define USB2_LINECTRL1_DM_RPD		BIT(16)
 #define USB2_LINECTRL1_OPMODE_NODRV	BIT(6)

 /* ADPCTRL */
 #define USB2_ADPCTRL_OTGSESSVLD		BIT(20)
 #define USB2_ADPCTRL_IDDIG		BIT(19)
 #define USB2_ADPCTRL_IDPULLUP		BIT(5)	/* 1 = ID sampling is enabled */
 #define USB2_ADPCTRL_DRVVBUS		BIT(4)

 struct rcar_gen3_chan {
 	void __iomem *base;
 	struct extcon_dev *extcon;
 	struct phy *phy;
 	struct regulator *vbus;
 	struct work_struct work;
 	bool extcon_host;
 	bool has_otg;
 };

 static void rcar_gen3_phy_usb2_work(struct work_struct *work)
 {
 	struct rcar_gen3_chan *ch = container_of(work, struct rcar_gen3_chan,
 						 work);

 	if (ch->extcon_host) {
 		extcon_set_cable_state_(ch->extcon, EXTCON_USB_HOST, true);
 		extcon_set_cable_state_(ch->extcon, EXTCON_USB, false);
 	} else {
 		extcon_set_cable_state_(ch->extcon, EXTCON_USB_HOST, false);
 		extcon_set_cable_state_(ch->extcon, EXTCON_USB, true);
 	}
 }

 static void rcar_gen3_set_host_mode(struct rcar_gen3_chan *ch, int host)
 {
 	void __iomem *usb2_base = ch->base;
 	u32 val = readl(usb2_base + USB2_COMMCTRL);

 	dev_vdbg(&ch->phy->dev, "%s: %08x, %d\n", __func__, val, host);
 	if (host)
 		val &= ~USB2_COMMCTRL_OTG_PERI;
 	else
 		val |= USB2_COMMCTRL_OTG_PERI;
 	writel(val, usb2_base + USB2_COMMCTRL);
 }

 static void rcar_gen3_set_linectrl(struct rcar_gen3_chan *ch, int dp, int dm)
 {
 	void __iomem *usb2_base = ch->base;
 	u32 val = readl(usb2_base + USB2_LINECTRL1);

 	dev_vdbg(&ch->phy->dev, "%s: %08x, %d, %d\n", __func__, val, dp, dm);
 	val &= ~(USB2_LINECTRL1_DP_RPD | USB2_LINECTRL1_DM_RPD);
 	if (dp)
 		val |= USB2_LINECTRL1_DP_RPD;
 	if (dm)
 		val |= USB2_LINECTRL1_DM_RPD;
 	writel(val, usb2_base + USB2_LINECTRL1);
 }

 static void rcar_gen3_enable_vbus_ctrl(struct rcar_gen3_chan *ch, int vbus)
 {
 	void __iomem *usb2_base = ch->base;
 	u32 val = readl(usb2_base + USB2_ADPCTRL);

 	dev_vdbg(&ch->phy->dev, "%s: %08x, %d\n", __func__, val, vbus);
 	if (vbus)
 		val |= USB2_ADPCTRL_DRVVBUS;
 	else
 		val &= ~USB2_ADPCTRL_DRVVBUS;
 	writel(val, usb2_base + USB2_ADPCTRL);
 }

 static void rcar_gen3_init_for_host(struct rcar_gen3_chan *ch)
 {
 	rcar_gen3_set_linectrl(ch, 1, 1);
 	rcar_gen3_set_host_mode(ch, 1);
 	rcar_gen3_enable_vbus_ctrl(ch, 1);

 	ch->extcon_host = true;
 	schedule_work(&ch->work);
 }

 static void rcar_gen3_init_for_peri(struct rcar_gen3_chan *ch)
 {
 	rcar_gen3_set_linectrl(ch, 0, 1);
 	rcar_gen3_set_host_mode(ch, 0);
 	rcar_gen3_enable_vbus_ctrl(ch, 0);

 	ch->extcon_host = false;
 	schedule_work(&ch->work);
 }

 static void rcar_gen3_init_for_b_host(struct rcar_gen3_chan *ch)
 {
 	void __iomem *usb2_base = ch->base;
 	u32 val;

 	val = readl(usb2_base + USB2_LINECTRL1);
 	writel(val | USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1);

 	rcar_gen3_set_linectrl(ch, 1, 1);
 	rcar_gen3_set_host_mode(ch, 1);
 	rcar_gen3_enable_vbus_ctrl(ch, 0);

 	val = readl(usb2_base + USB2_LINECTRL1);
 	writel(val & ~USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1);
 }

 static void rcar_gen3_init_for_a_peri(struct rcar_gen3_chan *ch)
 {
 	rcar_gen3_set_linectrl(ch, 0, 1);
 	rcar_gen3_set_host_mode(ch, 0);
 	rcar_gen3_enable_vbus_ctrl(ch, 1);
 }

 static void rcar_gen3_init_from_a_peri_to_a_host(struct rcar_gen3_chan *ch)
 {
 	void __iomem *usb2_base = ch->base;
 	u32 val;

 	val = readl(usb2_base + USB2_OBINTEN);
 	writel(val & ~USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);

 	rcar_gen3_enable_vbus_ctrl(ch, 0);
 	rcar_gen3_init_for_host(ch);

 	writel(val | USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);
 }

 static bool rcar_gen3_check_id(struct rcar_gen3_chan *ch)
 {
 	return !!(readl(ch->base + USB2_ADPCTRL) & USB2_ADPCTRL_IDDIG);
 }

 static void rcar_gen3_device_recognition(struct rcar_gen3_chan *ch)
 {
 	if (!rcar_gen3_check_id(ch))
 		rcar_gen3_init_for_host(ch);
 	else
 		rcar_gen3_init_for_peri(ch);
 }

 static bool rcar_gen3_is_host(struct rcar_gen3_chan *ch)
 {
 	return !(readl(ch->base + USB2_COMMCTRL) & USB2_COMMCTRL_OTG_PERI);
 }

 static ssize_t role_store(struct device *dev, struct device_attribute *attr,
 			  const char *buf, size_t count)
 {
 	struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
 	bool is_b_device, is_host, new_mode_is_host;

 	if (!ch->has_otg || !ch->phy->init_count)
 		return -EIO;

 	/*
 	 * is_b_device: true is B-Device. false is A-Device.
 	 * If {new_mode_}is_host: true is Host mode. false is Peripheral mode.
 	 */
 	is_b_device = rcar_gen3_check_id(ch);
 	is_host = rcar_gen3_is_host(ch);
 	if (!strncmp(buf, "host", strlen("host")))
 		new_mode_is_host = true;
 	else if (!strncmp(buf, "peripheral", strlen("peripheral")))
 		new_mode_is_host = false;
 	else
 		return -EINVAL;

 	/* If current and new mode is the same, this returns the error */
 	if (is_host == new_mode_is_host)
 		return -EINVAL;

 	if (new_mode_is_host) {		/* And is_host must be false */
 		if (!is_b_device)	/* A-Peripheral */
 			rcar_gen3_init_from_a_peri_to_a_host(ch);
 		else			/* B-Peripheral */
 			rcar_gen3_init_for_b_host(ch);
 	} else {			/* And is_host must be true */
 		if (!is_b_device)	/* A-Host */
 			rcar_gen3_init_for_a_peri(ch);
 		else			/* B-Host */
 			rcar_gen3_init_for_peri(ch);
 	}

 	return count;
 }

 static ssize_t role_show(struct device *dev, struct device_attribute *attr,
 			 char *buf)
 {
 	struct rcar_gen3_chan *ch = dev_get_drvdata(dev);

 	if (!ch->has_otg || !ch->phy->init_count)
 		return -EIO;

 	return sprintf(buf, "%s\n", rcar_gen3_is_host(ch) ? "host" :
 							    "peripheral");
 }
 static DEVICE_ATTR_RW(role);

 static void rcar_gen3_init_otg(struct rcar_gen3_chan *ch)
 {
 	void __iomem *usb2_base = ch->base;
 	u32 val;

 	val = readl(usb2_base + USB2_VBCTRL);
 	writel(val | USB2_VBCTRL_DRVVBUSSEL, usb2_base + USB2_VBCTRL);
 	writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTSTA);
 	val = readl(usb2_base + USB2_OBINTEN);
 	writel(val | USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);
 	val = readl(usb2_base + USB2_ADPCTRL);
 	writel(val | USB2_ADPCTRL_IDPULLUP, usb2_base + USB2_ADPCTRL);
 	val = readl(usb2_base + USB2_LINECTRL1);
 	rcar_gen3_set_linectrl(ch, 0, 0);
 	writel(val | USB2_LINECTRL1_DPRPD_EN | USB2_LINECTRL1_DMRPD_EN,
 	       usb2_base + USB2_LINECTRL1);

 	rcar_gen3_device_recognition(ch);
 }

 static int rcar_gen3_phy_usb2_init(struct phy *p)
 {
 	struct rcar_gen3_chan *channel = phy_get_drvdata(p);
 	void __iomem *usb2_base = channel->base;

 	/* Initialize USB2 part */
 	writel(USB2_INT_ENABLE_INIT, usb2_base + USB2_INT_ENABLE);
 	writel(USB2_SPD_RSM_TIMSET_INIT, usb2_base + USB2_SPD_RSM_TIMSET);
 	writel(USB2_OC_TIMSET_INIT, usb2_base + USB2_OC_TIMSET);

 	/* Initialize otg part */
 	if (channel->has_otg)
 		rcar_gen3_init_otg(channel);

 	return 0;
 }

 static int rcar_gen3_phy_usb2_exit(struct phy *p)
 {
 	struct rcar_gen3_chan *channel = phy_get_drvdata(p);

 	writel(0, channel->base + USB2_INT_ENABLE);

 	return 0;
 }

 static int rcar_gen3_phy_usb2_power_on(struct phy *p)
 {
 	struct rcar_gen3_chan *channel = phy_get_drvdata(p);
 	void __iomem *usb2_base = channel->base;
 	u32 val;
 	int ret;

 	if (channel->vbus) {
 		ret = regulator_enable(channel->vbus);
 		if (ret)
 			return ret;
 	}

 	val = readl(usb2_base + USB2_USBCTR);
 	val |= USB2_USBCTR_PLL_RST;
 	writel(val, usb2_base + USB2_USBCTR);
 	val &= ~USB2_USBCTR_PLL_RST;
 	writel(val, usb2_base + USB2_USBCTR);

 	return 0;
 }

 static int rcar_gen3_phy_usb2_power_off(struct phy *p)
 {
 	struct rcar_gen3_chan *channel = phy_get_drvdata(p);
 	int ret = 0;

 	if (channel->vbus)
 		ret = regulator_disable(channel->vbus);

 	return ret;
 }

 static struct phy_ops rcar_gen3_phy_usb2_ops = {
 	.init		= rcar_gen3_phy_usb2_init,
 	.exit		= rcar_gen3_phy_usb2_exit,
 	.power_on	= rcar_gen3_phy_usb2_power_on,
 	.power_off	= rcar_gen3_phy_usb2_power_off,
 	.owner		= THIS_MODULE,
 };

 static irqreturn_t rcar_gen3_phy_usb2_irq(int irq, void *_ch)
 {
 	struct rcar_gen3_chan *ch = _ch;
 	void __iomem *usb2_base = ch->base;
 	u32 status = readl(usb2_base + USB2_OBINTSTA);
 	irqreturn_t ret = IRQ_NONE;

 	if (status & USB2_OBINT_BITS) {
 		dev_vdbg(&ch->phy->dev, "%s: %08x\n", __func__, status);
 		writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTSTA);
 		rcar_gen3_device_recognition(ch);
 		ret = IRQ_HANDLED;
 	}

 	return ret;
 }

 static const struct of_device_id rcar_gen3_phy_usb2_match_table[] = {
 	{ .compatible = "renesas,usb2-phy-r8a7795" },
 	{ .compatible = "renesas,usb2-phy-r8a7796" },
 	{ .compatible = "renesas,rcar-gen3-usb2-phy" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb2_match_table);

 static const unsigned int rcar_gen3_phy_cable[] = {
 	EXTCON_USB,
 	EXTCON_USB_HOST,
 	EXTCON_NONE,
 };

 static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct rcar_gen3_chan *channel;
 	struct phy_provider *provider;
 	struct resource *res;
 	int irq;

 	if (!dev->of_node) {
 		dev_err(dev, "This driver needs device tree\n");
 		return -EINVAL;
 	}

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

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

 	/* call request_irq for OTG */
 	irq = platform_get_irq(pdev, 0);
 	if (irq >= 0) {
 		int ret;

 		INIT_WORK(&channel->work, rcar_gen3_phy_usb2_work);
 		irq = devm_request_irq(dev, irq, rcar_gen3_phy_usb2_irq,
 				       IRQF_SHARED, dev_name(dev), channel);
 		if (irq < 0)
 			dev_err(dev, "No irq handler (%d)\n", irq);
 		channel->has_otg = true;
 		channel->extcon = devm_extcon_dev_allocate(dev,
 							rcar_gen3_phy_cable);
 		if (IS_ERR(channel->extcon))
 			return PTR_ERR(channel->extcon);

 		ret = devm_extcon_dev_register(dev, channel->extcon);
 		if (ret < 0) {
 			dev_err(dev, "Failed to register extcon\n");
 			return ret;
 		}
 	}

 	/* devm_phy_create() will call pm_runtime_enable(dev); */
 	channel->phy = devm_phy_create(dev, NULL, &rcar_gen3_phy_usb2_ops);
 	if (IS_ERR(channel->phy)) {
 		dev_err(dev, "Failed to create USB2 PHY\n");
 		return PTR_ERR(channel->phy);
 	}

 	channel->vbus = devm_regulator_get_optional(dev, "vbus");
 	if (IS_ERR(channel->vbus)) {
 		if (PTR_ERR(channel->vbus) == -EPROBE_DEFER)
 			return PTR_ERR(channel->vbus);
 		channel->vbus = NULL;
 	}

 	platform_set_drvdata(pdev, channel);
 	phy_set_drvdata(channel->phy, channel);

 	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 	if (IS_ERR(provider)) {
 		dev_err(dev, "Failed to register PHY provider\n");
 	} else if (channel->has_otg) {
 		int ret;

 		ret = device_create_file(dev, &dev_attr_role);
 		if (ret < 0)
 			return ret;
 	}

 	return PTR_ERR_OR_ZERO(provider);
 }

 static int rcar_gen3_phy_usb2_remove(struct platform_device *pdev)
 {
 	struct rcar_gen3_chan *channel = platform_get_drvdata(pdev);

 	if (channel->has_otg)
 		device_remove_file(&pdev->dev, &dev_attr_role);

 	return 0;
 };

 static struct platform_driver rcar_gen3_phy_usb2_driver = {
 	.driver = {
 		.name		= "phy_rcar_gen3_usb2",
 		.of_match_table	= rcar_gen3_phy_usb2_match_table,
 	},
 	.probe	= rcar_gen3_phy_usb2_probe,
 	.remove = rcar_gen3_phy_usb2_remove,
 };
 module_platform_driver(rcar_gen3_phy_usb2_driver);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("Renesas R-Car Gen3 USB 2.0 PHY");
 MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>");
	/*
	* Renesas R-Car Gen3 for USB2.0 PHY driver
	*
	* Copyright (C) 2015 Renesas Electronics Corporation
	*
	* This is based on the phy-rcar-gen2 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/extcon.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_address.h>
	#include <linux/phy/phy.h>
	#include <linux/platform_device.h>
	#include <linux/regulator/consumer.h>
	#include <linux/workqueue.h>

	/***** USB2.0 Host registers (original offset is +0x200) *****/
	#define USB2_INT_ENABLE 0x000
	#define USB2_USBCTR 0x00c
	#define USB2_SPD_RSM_TIMSET 0x10c
	#define USB2_OC_TIMSET 0x110
	#define USB2_COMMCTRL 0x600
	#define USB2_OBINTSTA 0x604
	#define USB2_OBINTEN 0x608
	#define USB2_VBCTRL 0x60c
	#define USB2_LINECTRL1 0x610
	#define USB2_ADPCTRL 0x630

	/* INT_ENABLE */
	#define USB2_INT_ENABLE_UCOM_INTEN BIT(3)
	#define USB2_INT_ENABLE_USBH_INTB_EN BIT(2)
	#define USB2_INT_ENABLE_USBH_INTA_EN BIT(1)
	#define USB2_INT_ENABLE_INIT (USB2_INT_ENABLE_UCOM_INTEN \| \
	USB2_INT_ENABLE_USBH_INTB_EN \| \
	USB2_INT_ENABLE_USBH_INTA_EN)

	/* USBCTR */
	#define USB2_USBCTR_DIRPD BIT(2)
	#define USB2_USBCTR_PLL_RST BIT(1)

	/* SPD_RSM_TIMSET */
	#define USB2_SPD_RSM_TIMSET_INIT 0x014e029b

	/* OC_TIMSET */
	#define USB2_OC_TIMSET_INIT 0x000209ab

	/* COMMCTRL */
	#define USB2_COMMCTRL_OTG_PERI BIT(31) /* 1 = Peripheral mode */

	/* OBINTSTA and OBINTEN */
	#define USB2_OBINT_SESSVLDCHG BIT(12)
	#define USB2_OBINT_IDDIGCHG BIT(11)
	#define USB2_OBINT_BITS (USB2_OBINT_SESSVLDCHG \| \
	USB2_OBINT_IDDIGCHG)

	/* VBCTRL */
	#define USB2_VBCTRL_DRVVBUSSEL BIT(8)

	/* LINECTRL1 */
	#define USB2_LINECTRL1_DPRPD_EN BIT(19)
	#define USB2_LINECTRL1_DP_RPD BIT(18)
	#define USB2_LINECTRL1_DMRPD_EN BIT(17)
	#define USB2_LINECTRL1_DM_RPD BIT(16)
	#define USB2_LINECTRL1_OPMODE_NODRV BIT(6)

	/* ADPCTRL */
	#define USB2_ADPCTRL_OTGSESSVLD BIT(20)
	#define USB2_ADPCTRL_IDDIG BIT(19)
	#define USB2_ADPCTRL_IDPULLUP BIT(5) /* 1 = ID sampling is enabled */
	#define USB2_ADPCTRL_DRVVBUS BIT(4)

	struct rcar_gen3_chan {
	void __iomem *base;
	struct extcon_dev *extcon;
	struct phy *phy;
	struct regulator *vbus;
	struct work_struct work;
	bool extcon_host;
	bool has_otg;
	};

	static void rcar_gen3_phy_usb2_work(struct work_struct *work)
	{
	struct rcar_gen3_chan *ch = container_of(work, struct rcar_gen3_chan,
	work);

	if (ch->extcon_host) {
	extcon_set_cable_state_(ch->extcon, EXTCON_USB_HOST, true);
	extcon_set_cable_state_(ch->extcon, EXTCON_USB, false);
	} else {
	extcon_set_cable_state_(ch->extcon, EXTCON_USB_HOST, false);
	extcon_set_cable_state_(ch->extcon, EXTCON_USB, true);
	}
	}

	static void rcar_gen3_set_host_mode(struct rcar_gen3_chan *ch, int host)
	{
	void __iomem *usb2_base = ch->base;
	u32 val = readl(usb2_base + USB2_COMMCTRL);

	dev_vdbg(&ch->phy->dev, "%s: %08x, %d\n", __func__, val, host);
	if (host)
	val &= ~USB2_COMMCTRL_OTG_PERI;
	else
	val \|= USB2_COMMCTRL_OTG_PERI;
	writel(val, usb2_base + USB2_COMMCTRL);
	}

	static void rcar_gen3_set_linectrl(struct rcar_gen3_chan *ch, int dp, int dm)
	{
	void __iomem *usb2_base = ch->base;
	u32 val = readl(usb2_base + USB2_LINECTRL1);

	dev_vdbg(&ch->phy->dev, "%s: %08x, %d, %d\n", __func__, val, dp, dm);
	val &= ~(USB2_LINECTRL1_DP_RPD \| USB2_LINECTRL1_DM_RPD);
	if (dp)
	val \|= USB2_LINECTRL1_DP_RPD;
	if (dm)
	val \|= USB2_LINECTRL1_DM_RPD;
	writel(val, usb2_base + USB2_LINECTRL1);
	}

	static void rcar_gen3_enable_vbus_ctrl(struct rcar_gen3_chan *ch, int vbus)
	{
	void __iomem *usb2_base = ch->base;
	u32 val = readl(usb2_base + USB2_ADPCTRL);

	dev_vdbg(&ch->phy->dev, "%s: %08x, %d\n", __func__, val, vbus);
	if (vbus)
	val \|= USB2_ADPCTRL_DRVVBUS;
	else
	val &= ~USB2_ADPCTRL_DRVVBUS;
	writel(val, usb2_base + USB2_ADPCTRL);
	}

	static void rcar_gen3_init_for_host(struct rcar_gen3_chan *ch)
	{
	rcar_gen3_set_linectrl(ch, 1, 1);
	rcar_gen3_set_host_mode(ch, 1);
	rcar_gen3_enable_vbus_ctrl(ch, 1);

	ch->extcon_host = true;
	schedule_work(&ch->work);
	}

	static void rcar_gen3_init_for_peri(struct rcar_gen3_chan *ch)
	{
	rcar_gen3_set_linectrl(ch, 0, 1);
	rcar_gen3_set_host_mode(ch, 0);
	rcar_gen3_enable_vbus_ctrl(ch, 0);

	ch->extcon_host = false;
	schedule_work(&ch->work);
	}

	static void rcar_gen3_init_for_b_host(struct rcar_gen3_chan *ch)
	{
	void __iomem *usb2_base = ch->base;
	u32 val;

	val = readl(usb2_base + USB2_LINECTRL1);
	writel(val \| USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1);

	rcar_gen3_set_linectrl(ch, 1, 1);
	rcar_gen3_set_host_mode(ch, 1);
	rcar_gen3_enable_vbus_ctrl(ch, 0);

	val = readl(usb2_base + USB2_LINECTRL1);
	writel(val & ~USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1);
	}

	static void rcar_gen3_init_for_a_peri(struct rcar_gen3_chan *ch)
	{
	rcar_gen3_set_linectrl(ch, 0, 1);
	rcar_gen3_set_host_mode(ch, 0);
	rcar_gen3_enable_vbus_ctrl(ch, 1);
	}

	static void rcar_gen3_init_from_a_peri_to_a_host(struct rcar_gen3_chan *ch)
	{
	void __iomem *usb2_base = ch->base;
	u32 val;

	val = readl(usb2_base + USB2_OBINTEN);
	writel(val & ~USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);

	rcar_gen3_enable_vbus_ctrl(ch, 0);
	rcar_gen3_init_for_host(ch);

	writel(val \| USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);
	}

	static bool rcar_gen3_check_id(struct rcar_gen3_chan *ch)
	{
	return !!(readl(ch->base + USB2_ADPCTRL) & USB2_ADPCTRL_IDDIG);
	}

	static void rcar_gen3_device_recognition(struct rcar_gen3_chan *ch)
	{
	if (!rcar_gen3_check_id(ch))
	rcar_gen3_init_for_host(ch);
	else
	rcar_gen3_init_for_peri(ch);
	}

	static bool rcar_gen3_is_host(struct rcar_gen3_chan *ch)
	{
	return !(readl(ch->base + USB2_COMMCTRL) & USB2_COMMCTRL_OTG_PERI);
	}

	static ssize_t role_store(struct device dev, struct device_attribute attr,
	const char *buf, size_t count)
	{
	struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
	bool is_b_device, is_host, new_mode_is_host;

	if (!ch->has_otg \|\| !ch->phy->init_count)
	return -EIO;

	/*
	* is_b_device: true is B-Device. false is A-Device.
	* If {new_mode_}is_host: true is Host mode. false is Peripheral mode.
	*/
	is_b_device = rcar_gen3_check_id(ch);
	is_host = rcar_gen3_is_host(ch);
	if (!strncmp(buf, "host", strlen("host")))
	new_mode_is_host = true;
	else if (!strncmp(buf, "peripheral", strlen("peripheral")))
	new_mode_is_host = false;
	else
	return -EINVAL;

	/* If current and new mode is the same, this returns the error */
	if (is_host == new_mode_is_host)
	return -EINVAL;

	if (new_mode_is_host) { /* And is_host must be false */
	if (!is_b_device) /* A-Peripheral */
	rcar_gen3_init_from_a_peri_to_a_host(ch);
	else /* B-Peripheral */
	rcar_gen3_init_for_b_host(ch);
	} else { /* And is_host must be true */
	if (!is_b_device) /* A-Host */
	rcar_gen3_init_for_a_peri(ch);
	else /* B-Host */
	rcar_gen3_init_for_peri(ch);
	}

	return count;
	}

	static ssize_t role_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	struct rcar_gen3_chan *ch = dev_get_drvdata(dev);

	if (!ch->has_otg \|\| !ch->phy->init_count)
	return -EIO;

	return sprintf(buf, "%s\n", rcar_gen3_is_host(ch) ? "host" :
	"peripheral");
	}
	static DEVICE_ATTR_RW(role);

	static void rcar_gen3_init_otg(struct rcar_gen3_chan *ch)
	{
	void __iomem *usb2_base = ch->base;
	u32 val;

	val = readl(usb2_base + USB2_VBCTRL);
	writel(val \| USB2_VBCTRL_DRVVBUSSEL, usb2_base + USB2_VBCTRL);
	writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTSTA);
	val = readl(usb2_base + USB2_OBINTEN);
	writel(val \| USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);
	val = readl(usb2_base + USB2_ADPCTRL);
	writel(val \| USB2_ADPCTRL_IDPULLUP, usb2_base + USB2_ADPCTRL);
	val = readl(usb2_base + USB2_LINECTRL1);
	rcar_gen3_set_linectrl(ch, 0, 0);
	writel(val \| USB2_LINECTRL1_DPRPD_EN \| USB2_LINECTRL1_DMRPD_EN,
	usb2_base + USB2_LINECTRL1);

	rcar_gen3_device_recognition(ch);
	}

	static int rcar_gen3_phy_usb2_init(struct phy *p)
	{
	struct rcar_gen3_chan *channel = phy_get_drvdata(p);
	void __iomem *usb2_base = channel->base;

	/* Initialize USB2 part */
	writel(USB2_INT_ENABLE_INIT, usb2_base + USB2_INT_ENABLE);
	writel(USB2_SPD_RSM_TIMSET_INIT, usb2_base + USB2_SPD_RSM_TIMSET);
	writel(USB2_OC_TIMSET_INIT, usb2_base + USB2_OC_TIMSET);

	/* Initialize otg part */
	if (channel->has_otg)
	rcar_gen3_init_otg(channel);

	return 0;
	}

	static int rcar_gen3_phy_usb2_exit(struct phy *p)
	{
	struct rcar_gen3_chan *channel = phy_get_drvdata(p);

	writel(0, channel->base + USB2_INT_ENABLE);

	return 0;
	}

	static int rcar_gen3_phy_usb2_power_on(struct phy *p)
	{
	struct rcar_gen3_chan *channel = phy_get_drvdata(p);
	void __iomem *usb2_base = channel->base;
	u32 val;
	int ret;

	if (channel->vbus) {
	ret = regulator_enable(channel->vbus);
	if (ret)
	return ret;
	}

	val = readl(usb2_base + USB2_USBCTR);
	val \|= USB2_USBCTR_PLL_RST;
	writel(val, usb2_base + USB2_USBCTR);
	val &= ~USB2_USBCTR_PLL_RST;
	writel(val, usb2_base + USB2_USBCTR);

	return 0;
	}

	static int rcar_gen3_phy_usb2_power_off(struct phy *p)
	{
	struct rcar_gen3_chan *channel = phy_get_drvdata(p);
	int ret = 0;

	if (channel->vbus)
	ret = regulator_disable(channel->vbus);

	return ret;
	}

	static struct phy_ops rcar_gen3_phy_usb2_ops = {
	.init = rcar_gen3_phy_usb2_init,
	.exit = rcar_gen3_phy_usb2_exit,
	.power_on = rcar_gen3_phy_usb2_power_on,
	.power_off = rcar_gen3_phy_usb2_power_off,
	.owner = THIS_MODULE,
	};

	static irqreturn_t rcar_gen3_phy_usb2_irq(int irq, void *_ch)
	{
	struct rcar_gen3_chan *ch = _ch;
	void __iomem *usb2_base = ch->base;
	u32 status = readl(usb2_base + USB2_OBINTSTA);
	irqreturn_t ret = IRQ_NONE;

	if (status & USB2_OBINT_BITS) {
	dev_vdbg(&ch->phy->dev, "%s: %08x\n", __func__, status);
	writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTSTA);
	rcar_gen3_device_recognition(ch);
	ret = IRQ_HANDLED;
	}

	return ret;
	}

	static const struct of_device_id rcar_gen3_phy_usb2_match_table[] = {
	{ .compatible = "renesas,usb2-phy-r8a7795" },
	{ .compatible = "renesas,usb2-phy-r8a7796" },
	{ .compatible = "renesas,rcar-gen3-usb2-phy" },
	{ }
	};
	MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb2_match_table);

	static const unsigned int rcar_gen3_phy_cable[] = {
	EXTCON_USB,
	EXTCON_USB_HOST,
	EXTCON_NONE,
	};

	static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct rcar_gen3_chan *channel;
	struct phy_provider *provider;
	struct resource *res;
	int irq;

	if (!dev->of_node) {
	dev_err(dev, "This driver needs device tree\n");
	return -EINVAL;
	}

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

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

	/* call request_irq for OTG */
	irq = platform_get_irq(pdev, 0);
	if (irq >= 0) {
	int ret;

	INIT_WORK(&channel->work, rcar_gen3_phy_usb2_work);
	irq = devm_request_irq(dev, irq, rcar_gen3_phy_usb2_irq,
	IRQF_SHARED, dev_name(dev), channel);
	if (irq < 0)
	dev_err(dev, "No irq handler (%d)\n", irq);
	channel->has_otg = true;
	channel->extcon = devm_extcon_dev_allocate(dev,
	rcar_gen3_phy_cable);
	if (IS_ERR(channel->extcon))
	return PTR_ERR(channel->extcon);

	ret = devm_extcon_dev_register(dev, channel->extcon);
	if (ret < 0) {
	dev_err(dev, "Failed to register extcon\n");
	return ret;
	}
	}

	/* devm_phy_create() will call pm_runtime_enable(dev); */
	channel->phy = devm_phy_create(dev, NULL, &rcar_gen3_phy_usb2_ops);
	if (IS_ERR(channel->phy)) {
	dev_err(dev, "Failed to create USB2 PHY\n");
	return PTR_ERR(channel->phy);
	}

	channel->vbus = devm_regulator_get_optional(dev, "vbus");
	if (IS_ERR(channel->vbus)) {
	if (PTR_ERR(channel->vbus) == -EPROBE_DEFER)
	return PTR_ERR(channel->vbus);
	channel->vbus = NULL;
	}

	platform_set_drvdata(pdev, channel);
	phy_set_drvdata(channel->phy, channel);

	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
	if (IS_ERR(provider)) {
	dev_err(dev, "Failed to register PHY provider\n");
	} else if (channel->has_otg) {
	int ret;

	ret = device_create_file(dev, &dev_attr_role);
	if (ret < 0)
	return ret;
	}

	return PTR_ERR_OR_ZERO(provider);
	}

	static int rcar_gen3_phy_usb2_remove(struct platform_device *pdev)
	{
	struct rcar_gen3_chan *channel = platform_get_drvdata(pdev);

	if (channel->has_otg)
	device_remove_file(&pdev->dev, &dev_attr_role);

	return 0;
	};

	static struct platform_driver rcar_gen3_phy_usb2_driver = {
	.driver = {
	.name = "phy_rcar_gen3_usb2",
	.of_match_table = rcar_gen3_phy_usb2_match_table,
	},
	.probe = rcar_gen3_phy_usb2_probe,
	.remove = rcar_gen3_phy_usb2_remove,
	};
	module_platform_driver(rcar_gen3_phy_usb2_driver);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("Renesas R-Car Gen3 USB 2.0 PHY");
	MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>");