drivers/phy/phy-rcar-gen3-usb2.c - 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/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>

 /******* 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)

 /* 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)

 /******* HSUSB registers (original offset is +0x100) *******/
 #define HSUSB_LPSTS			0x02
 #define HSUSB_UGCTRL2			0x84

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

 /* USB General control register 2 (UGCTRL2) */
 #define HSUSB_UGCTRL2_MASK		0x00000031 /* bit[31:6] should be 0 */
 #define HSUSB_UGCTRL2_USB0SEL		0x00000030
 #define HSUSB_UGCTRL2_USB0SEL_HOST	0x00000010
 #define HSUSB_UGCTRL2_USB0SEL_HS_USB	0x00000020
 #define HSUSB_UGCTRL2_USB0SEL_OTG	0x00000030

 struct rcar_gen3_data {
 	void __iomem *base;
 	struct clk *clk;
 };

 struct rcar_gen3_chan {
 	struct rcar_gen3_data usb2;
 	struct rcar_gen3_data hsusb;
 	struct phy *phy;
 };

 static void rcar_gen3_set_host_mode(struct rcar_gen3_chan *ch, int host)
 {
 	void __iomem *usb2_base = ch->usb2.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->usb2.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->usb2.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);
 }

 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);
 }

 static bool rcar_gen3_check_vbus(struct rcar_gen3_chan *ch)
 {
 	return !!(readl(ch->usb2.base + USB2_ADPCTRL) &
 		  USB2_ADPCTRL_OTGSESSVLD);
 }

 static bool rcar_gen3_check_id(struct rcar_gen3_chan *ch)
 {
 	return !!(readl(ch->usb2.base + USB2_ADPCTRL) & USB2_ADPCTRL_IDDIG);
 }

 static void rcar_gen3_device_recognition(struct rcar_gen3_chan *ch)
 {
 	bool is_host = true;

 	/* B-device? */
 	if (rcar_gen3_check_id(ch) && rcar_gen3_check_vbus(ch))
 		is_host = false;

 	if (is_host)
 		rcar_gen3_init_for_host(ch);
 	else
 		rcar_gen3_init_for_peri(ch);
 }

 static void rcar_gen3_init_otg(struct rcar_gen3_chan *ch)
 {
 	void __iomem *usb2_base = ch->usb2.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->usb2.base;
 	void __iomem *hsusb_base = channel->hsusb.base;
 	u32 val;

 	/* 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 HSUSB part */
 	if (hsusb_base) {
 		val = readl(hsusb_base + HSUSB_UGCTRL2);
 		val = (val & ~HSUSB_UGCTRL2_USB0SEL) |
 		      HSUSB_UGCTRL2_USB0SEL_OTG;
 		writel(val & HSUSB_UGCTRL2_MASK, hsusb_base + HSUSB_UGCTRL2);

 		/* Initialize otg part */
 		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->usb2.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->usb2.base;
 	void __iomem *hsusb_base = channel->hsusb.base;
 	u32 val;

 	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);

 	/*
 	 * TODO: To reduce power consuming, this driver should set the SUSPM
 	 *	after the PHY detects ID pin as peripheral.
 	 */
 	if (hsusb_base) {
 		/* Power on HSUSB PHY */
 		val = readw(hsusb_base + HSUSB_LPSTS);
 		val |= HSUSB_LPSTS_SUSPM;
 		writew(val, hsusb_base + HSUSB_LPSTS);
 	}

 	return 0;
 }

 static int rcar_gen3_phy_usb2_power_off(struct phy *p)
 {
 	struct rcar_gen3_chan *channel = phy_get_drvdata(p);
 	void __iomem *hsusb_base = channel->hsusb.base;
 	u32 val;

 	if (hsusb_base) {
 		/* Power off HSUSB PHY */
 		val = readw(hsusb_base + HSUSB_LPSTS);
 		val &= ~HSUSB_LPSTS_SUSPM;
 		writew(val, hsusb_base + HSUSB_LPSTS);
 	}

 	return 0;
 }

 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->usb2.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" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb2_match_table);

 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;

 	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_byname(pdev, IORESOURCE_MEM, "usb2_host");
 	channel->usb2.base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(channel->usb2.base))
 		return PTR_ERR(channel->usb2.base);

 	/* "hsusb" memory resource is optional */
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "hsusb");

 	/* To avoid error message by devm_ioremap_resource() */
 	if (res) {
 		int irq;

 		channel->hsusb.base = devm_ioremap_resource(dev, res);
 		if (IS_ERR(channel->hsusb.base))
 			channel->hsusb.base = NULL;
 		/* call request_irq for OTG */
 		irq = platform_get_irq(pdev, 0);
 		if (irq >= 0)
 			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);
 	}

 	/* 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);
 	}

 	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");

 	return PTR_ERR_OR_ZERO(provider);
 }

 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,
 };
 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/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>

	/***** 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)

	/* 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)

	/***** HSUSB registers (original offset is +0x100) *****/
	#define HSUSB_LPSTS 0x02
	#define HSUSB_UGCTRL2 0x84

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

	/* USB General control register 2 (UGCTRL2) */
	#define HSUSB_UGCTRL2_MASK 0x00000031 /* bit[31:6] should be 0 */
	#define HSUSB_UGCTRL2_USB0SEL 0x00000030
	#define HSUSB_UGCTRL2_USB0SEL_HOST 0x00000010
	#define HSUSB_UGCTRL2_USB0SEL_HS_USB 0x00000020
	#define HSUSB_UGCTRL2_USB0SEL_OTG 0x00000030

	struct rcar_gen3_data {
	void __iomem *base;
	struct clk *clk;
	};

	struct rcar_gen3_chan {
	struct rcar_gen3_data usb2;
	struct rcar_gen3_data hsusb;
	struct phy *phy;
	};

	static void rcar_gen3_set_host_mode(struct rcar_gen3_chan *ch, int host)
	{
	void __iomem *usb2_base = ch->usb2.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->usb2.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->usb2.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);
	}

	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);
	}

	static bool rcar_gen3_check_vbus(struct rcar_gen3_chan *ch)
	{
	return !!(readl(ch->usb2.base + USB2_ADPCTRL) &
	USB2_ADPCTRL_OTGSESSVLD);
	}

	static bool rcar_gen3_check_id(struct rcar_gen3_chan *ch)
	{
	return !!(readl(ch->usb2.base + USB2_ADPCTRL) & USB2_ADPCTRL_IDDIG);
	}

	static void rcar_gen3_device_recognition(struct rcar_gen3_chan *ch)
	{
	bool is_host = true;

	/* B-device? */
	if (rcar_gen3_check_id(ch) && rcar_gen3_check_vbus(ch))
	is_host = false;

	if (is_host)
	rcar_gen3_init_for_host(ch);
	else
	rcar_gen3_init_for_peri(ch);
	}

	static void rcar_gen3_init_otg(struct rcar_gen3_chan *ch)
	{
	void __iomem *usb2_base = ch->usb2.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->usb2.base;
	void __iomem *hsusb_base = channel->hsusb.base;
	u32 val;

	/* 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 HSUSB part */
	if (hsusb_base) {
	val = readl(hsusb_base + HSUSB_UGCTRL2);
	val = (val & ~HSUSB_UGCTRL2_USB0SEL) \|
	HSUSB_UGCTRL2_USB0SEL_OTG;
	writel(val & HSUSB_UGCTRL2_MASK, hsusb_base + HSUSB_UGCTRL2);

	/* Initialize otg part */
	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->usb2.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->usb2.base;
	void __iomem *hsusb_base = channel->hsusb.base;
	u32 val;

	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);

	/*
	* TODO: To reduce power consuming, this driver should set the SUSPM
	* after the PHY detects ID pin as peripheral.
	*/
	if (hsusb_base) {
	/* Power on HSUSB PHY */
	val = readw(hsusb_base + HSUSB_LPSTS);
	val \|= HSUSB_LPSTS_SUSPM;
	writew(val, hsusb_base + HSUSB_LPSTS);
	}

	return 0;
	}

	static int rcar_gen3_phy_usb2_power_off(struct phy *p)
	{
	struct rcar_gen3_chan *channel = phy_get_drvdata(p);
	void __iomem *hsusb_base = channel->hsusb.base;
	u32 val;

	if (hsusb_base) {
	/* Power off HSUSB PHY */
	val = readw(hsusb_base + HSUSB_LPSTS);
	val &= ~HSUSB_LPSTS_SUSPM;
	writew(val, hsusb_base + HSUSB_LPSTS);
	}

	return 0;
	}

	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->usb2.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" },
	{ }
	};
	MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb2_match_table);

	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;

	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_byname(pdev, IORESOURCE_MEM, "usb2_host");
	channel->usb2.base = devm_ioremap_resource(dev, res);
	if (IS_ERR(channel->usb2.base))
	return PTR_ERR(channel->usb2.base);

	/* "hsusb" memory resource is optional */
	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "hsusb");

	/* To avoid error message by devm_ioremap_resource() */
	if (res) {
	int irq;

	channel->hsusb.base = devm_ioremap_resource(dev, res);
	if (IS_ERR(channel->hsusb.base))
	channel->hsusb.base = NULL;
	/* call request_irq for OTG */
	irq = platform_get_irq(pdev, 0);
	if (irq >= 0)
	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);
	}

	/* 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);
	}

	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");

	return PTR_ERR_OR_ZERO(provider);
	}

	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,
	};
	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>");