[mirror_ubuntu-zesty-kernel.git] / drivers / phy / phy-rcar-gen3-usb2.c

/*
 * 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>");
Commit	Line	Data
f3b5a8d9 YS	1	/*
	2	* Renesas R-Car Gen3 for USB2.0 PHY driver
	3	*
	4	* Copyright (C) 2015 Renesas Electronics Corporation
	5	*
	6	* This is based on the phy-rcar-gen2 driver:
	7	* Copyright (C) 2014 Renesas Solutions Corp.
	8	* Copyright (C) 2014 Cogent Embedded, Inc.
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*/
	14
2b38543c	15	#include <linux/extcon.h>
9f391c57	16	#include <linux/interrupt.h>
f3b5a8d9 YS	17	#include <linux/io.h>
	18	#include <linux/module.h>
	19	#include <linux/of.h>
	20	#include <linux/of_address.h>
	21	#include <linux/phy/phy.h>
	22	#include <linux/platform_device.h>
6dcfd7c3	23	#include <linux/regulator/consumer.h>
c14f8a40	24	#include <linux/workqueue.h>
f3b5a8d9 YS	25
	26	/***** USB2.0 Host registers (original offset is +0x200) *****/
	27	#define USB2_INT_ENABLE 0x000
	28	#define USB2_USBCTR 0x00c
	29	#define USB2_SPD_RSM_TIMSET 0x10c
	30	#define USB2_OC_TIMSET 0x110
1114e2d3	31	#define USB2_COMMCTRL 0x600
9f391c57 YS	32	#define USB2_OBINTSTA 0x604
9f391c57 YS	33	#define USB2_OBINTEN 0x608
1114e2d3 YS	34	#define USB2_VBCTRL 0x60c
	35	#define USB2_LINECTRL1 0x610
	36	#define USB2_ADPCTRL 0x630
f3b5a8d9 YS	37
f3b5a8d9 YS	38	/* INT_ENABLE */
9f391c57	39	#define USB2_INT_ENABLE_UCOM_INTEN BIT(3)
f3b5a8d9 YS	40	#define USB2_INT_ENABLE_USBH_INTB_EN BIT(2)
f3b5a8d9 YS	41	#define USB2_INT_ENABLE_USBH_INTA_EN BIT(1)
9f391c57 YS	42	#define USB2_INT_ENABLE_INIT (USB2_INT_ENABLE_UCOM_INTEN \| \
9f391c57 YS	43	USB2_INT_ENABLE_USBH_INTB_EN \| \
f3b5a8d9 YS	44	USB2_INT_ENABLE_USBH_INTA_EN)
	45
	46	/* USBCTR */
	47	#define USB2_USBCTR_DIRPD BIT(2)
	48	#define USB2_USBCTR_PLL_RST BIT(1)
	49
	50	/* SPD_RSM_TIMSET */
	51	#define USB2_SPD_RSM_TIMSET_INIT 0x014e029b
	52
	53	/* OC_TIMSET */
	54	#define USB2_OC_TIMSET_INIT 0x000209ab
	55
1114e2d3 YS	56	/* COMMCTRL */
	57	#define USB2_COMMCTRL_OTG_PERI BIT(31) /* 1 = Peripheral mode */
	58
9f391c57 YS	59	/* OBINTSTA and OBINTEN */
	60	#define USB2_OBINT_SESSVLDCHG BIT(12)
	61	#define USB2_OBINT_IDDIGCHG BIT(11)
	62	#define USB2_OBINT_BITS (USB2_OBINT_SESSVLDCHG \| \
	63	USB2_OBINT_IDDIGCHG)
	64
1114e2d3 YS	65	/* VBCTRL */
	66	#define USB2_VBCTRL_DRVVBUSSEL BIT(8)
	67
	68	/* LINECTRL1 */
	69	#define USB2_LINECTRL1_DPRPD_EN BIT(19)
	70	#define USB2_LINECTRL1_DP_RPD BIT(18)
	71	#define USB2_LINECTRL1_DMRPD_EN BIT(17)
	72	#define USB2_LINECTRL1_DM_RPD BIT(16)
9bb86777	73	#define USB2_LINECTRL1_OPMODE_NODRV BIT(6)
1114e2d3 YS	74
	75	/* ADPCTRL */
	76	#define USB2_ADPCTRL_OTGSESSVLD BIT(20)
	77	#define USB2_ADPCTRL_IDDIG BIT(19)
	78	#define USB2_ADPCTRL_IDPULLUP BIT(5) /* 1 = ID sampling is enabled */
	79	#define USB2_ADPCTRL_DRVVBUS BIT(4)
	80
f3b5a8d9	81	struct rcar_gen3_chan {
801a69c7	82	void __iomem *base;
2b38543c	83	struct extcon_dev *extcon;
f3b5a8d9	84	struct phy *phy;
6dcfd7c3	85	struct regulator *vbus;
c14f8a40 YS	86	struct work_struct work;
c14f8a40 YS	87	bool extcon_host;
b9564016	88	bool has_otg;
f3b5a8d9 YS	89	};
f3b5a8d9 YS	90
c14f8a40 YS	91	static void rcar_gen3_phy_usb2_work(struct work_struct *work)
	92	{
	93	struct rcar_gen3_chan *ch = container_of(work, struct rcar_gen3_chan,
	94	work);
	95
	96	if (ch->extcon_host) {
	97	extcon_set_cable_state_(ch->extcon, EXTCON_USB_HOST, true);
	98	extcon_set_cable_state_(ch->extcon, EXTCON_USB, false);
	99	} else {
	100	extcon_set_cable_state_(ch->extcon, EXTCON_USB_HOST, false);
	101	extcon_set_cable_state_(ch->extcon, EXTCON_USB, true);
	102	}
	103	}
	104
1114e2d3 YS	105	static void rcar_gen3_set_host_mode(struct rcar_gen3_chan *ch, int host)
1114e2d3 YS	106	{
801a69c7	107	void __iomem *usb2_base = ch->base;
1114e2d3 YS	108	u32 val = readl(usb2_base + USB2_COMMCTRL);
	109
	110	dev_vdbg(&ch->phy->dev, "%s: %08x, %d\n", __func__, val, host);
	111	if (host)
	112	val &= ~USB2_COMMCTRL_OTG_PERI;
	113	else
	114	val \|= USB2_COMMCTRL_OTG_PERI;
	115	writel(val, usb2_base + USB2_COMMCTRL);
	116	}
	117
	118	static void rcar_gen3_set_linectrl(struct rcar_gen3_chan *ch, int dp, int dm)
	119	{
801a69c7	120	void __iomem *usb2_base = ch->base;
1114e2d3 YS	121	u32 val = readl(usb2_base + USB2_LINECTRL1);
	122
	123	dev_vdbg(&ch->phy->dev, "%s: %08x, %d, %d\n", __func__, val, dp, dm);
	124	val &= ~(USB2_LINECTRL1_DP_RPD \| USB2_LINECTRL1_DM_RPD);
	125	if (dp)
	126	val \|= USB2_LINECTRL1_DP_RPD;
	127	if (dm)
	128	val \|= USB2_LINECTRL1_DM_RPD;
	129	writel(val, usb2_base + USB2_LINECTRL1);
	130	}
	131
	132	static void rcar_gen3_enable_vbus_ctrl(struct rcar_gen3_chan *ch, int vbus)
	133	{
801a69c7	134	void __iomem *usb2_base = ch->base;
1114e2d3 YS	135	u32 val = readl(usb2_base + USB2_ADPCTRL);
	136
	137	dev_vdbg(&ch->phy->dev, "%s: %08x, %d\n", __func__, val, vbus);
	138	if (vbus)
	139	val \|= USB2_ADPCTRL_DRVVBUS;
	140	else
	141	val &= ~USB2_ADPCTRL_DRVVBUS;
	142	writel(val, usb2_base + USB2_ADPCTRL);
	143	}
	144
	145	static void rcar_gen3_init_for_host(struct rcar_gen3_chan *ch)
	146	{
	147	rcar_gen3_set_linectrl(ch, 1, 1);
	148	rcar_gen3_set_host_mode(ch, 1);
	149	rcar_gen3_enable_vbus_ctrl(ch, 1);
2b38543c	150
c14f8a40 YS	151	ch->extcon_host = true;
c14f8a40 YS	152	schedule_work(&ch->work);
1114e2d3 YS	153	}
	154
	155	static void rcar_gen3_init_for_peri(struct rcar_gen3_chan *ch)
	156	{
	157	rcar_gen3_set_linectrl(ch, 0, 1);
	158	rcar_gen3_set_host_mode(ch, 0);
	159	rcar_gen3_enable_vbus_ctrl(ch, 0);
2b38543c	160
c14f8a40 YS	161	ch->extcon_host = false;
c14f8a40 YS	162	schedule_work(&ch->work);
1114e2d3 YS	163	}
1114e2d3 YS	164
9bb86777 YS	165	static void rcar_gen3_init_for_b_host(struct rcar_gen3_chan *ch)
	166	{
	167	void __iomem *usb2_base = ch->base;
	168	u32 val;
	169
	170	val = readl(usb2_base + USB2_LINECTRL1);
	171	writel(val \| USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1);
	172
	173	rcar_gen3_set_linectrl(ch, 1, 1);
	174	rcar_gen3_set_host_mode(ch, 1);
	175	rcar_gen3_enable_vbus_ctrl(ch, 0);
	176
	177	val = readl(usb2_base + USB2_LINECTRL1);
	178	writel(val & ~USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1);
	179	}
	180
	181	static void rcar_gen3_init_for_a_peri(struct rcar_gen3_chan *ch)
	182	{
	183	rcar_gen3_set_linectrl(ch, 0, 1);
	184	rcar_gen3_set_host_mode(ch, 0);
	185	rcar_gen3_enable_vbus_ctrl(ch, 1);
	186	}
	187
	188	static void rcar_gen3_init_from_a_peri_to_a_host(struct rcar_gen3_chan *ch)
	189	{
	190	void __iomem *usb2_base = ch->base;
	191	u32 val;
	192
	193	val = readl(usb2_base + USB2_OBINTEN);
	194	writel(val & ~USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);
	195
	196	rcar_gen3_enable_vbus_ctrl(ch, 0);
	197	rcar_gen3_init_for_host(ch);
	198
	199	writel(val \| USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);
	200	}
	201
1114e2d3 YS	202	static bool rcar_gen3_check_id(struct rcar_gen3_chan *ch)
1114e2d3 YS	203	{
801a69c7	204	return !!(readl(ch->base + USB2_ADPCTRL) & USB2_ADPCTRL_IDDIG);
1114e2d3 YS	205	}
	206
	207	static void rcar_gen3_device_recognition(struct rcar_gen3_chan *ch)
	208	{
6762925d	209	if (!rcar_gen3_check_id(ch))
1114e2d3 YS	210	rcar_gen3_init_for_host(ch);
	211	else
	212	rcar_gen3_init_for_peri(ch);
	213	}
	214
9bb86777 YS	215	static bool rcar_gen3_is_host(struct rcar_gen3_chan *ch)
	216	{
	217	return !(readl(ch->base + USB2_COMMCTRL) & USB2_COMMCTRL_OTG_PERI);
	218	}
	219
	220	static ssize_t role_store(struct device dev, struct device_attribute attr,
	221	const char *buf, size_t count)
	222	{
	223	struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
	224	bool is_b_device, is_host, new_mode_is_host;
	225
	226	if (!ch->has_otg \|\| !ch->phy->init_count)
	227	return -EIO;
	228
	229	/*
	230	* is_b_device: true is B-Device. false is A-Device.
	231	* If {new_mode_}is_host: true is Host mode. false is Peripheral mode.
	232	*/
	233	is_b_device = rcar_gen3_check_id(ch);
	234	is_host = rcar_gen3_is_host(ch);
	235	if (!strncmp(buf, "host", strlen("host")))
	236	new_mode_is_host = true;
	237	else if (!strncmp(buf, "peripheral", strlen("peripheral")))
	238	new_mode_is_host = false;
	239	else
	240	return -EINVAL;
	241
	242	/* If current and new mode is the same, this returns the error */
	243	if (is_host == new_mode_is_host)
	244	return -EINVAL;
	245
	246	if (new_mode_is_host) { /* And is_host must be false */
	247	if (!is_b_device) /* A-Peripheral */
	248	rcar_gen3_init_from_a_peri_to_a_host(ch);
	249	else /* B-Peripheral */
	250	rcar_gen3_init_for_b_host(ch);
	251	} else { /* And is_host must be true */
	252	if (!is_b_device) /* A-Host */
	253	rcar_gen3_init_for_a_peri(ch);
	254	else /* B-Host */
	255	rcar_gen3_init_for_peri(ch);
	256	}
	257
	258	return count;
	259	}
	260
	261	static ssize_t role_show(struct device dev, struct device_attribute attr,
	262	char *buf)
	263	{
	264	struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
	265
	266	if (!ch->has_otg \|\| !ch->phy->init_count)
	267	return -EIO;
	268
	269	return sprintf(buf, "%s\n", rcar_gen3_is_host(ch) ? "host" :
	270	"peripheral");
	271	}
	272	static DEVICE_ATTR_RW(role);
	273
1114e2d3 YS	274	static void rcar_gen3_init_otg(struct rcar_gen3_chan *ch)
1114e2d3 YS	275	{
801a69c7	276	void __iomem *usb2_base = ch->base;
1114e2d3 YS	277	u32 val;
	278
	279	val = readl(usb2_base + USB2_VBCTRL);
	280	writel(val \| USB2_VBCTRL_DRVVBUSSEL, usb2_base + USB2_VBCTRL);
9f391c57 YS	281	writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTSTA);
	282	val = readl(usb2_base + USB2_OBINTEN);
	283	writel(val \| USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);
1114e2d3 YS	284	val = readl(usb2_base + USB2_ADPCTRL);
	285	writel(val \| USB2_ADPCTRL_IDPULLUP, usb2_base + USB2_ADPCTRL);
	286	val = readl(usb2_base + USB2_LINECTRL1);
	287	rcar_gen3_set_linectrl(ch, 0, 0);
	288	writel(val \| USB2_LINECTRL1_DPRPD_EN \| USB2_LINECTRL1_DMRPD_EN,
	289	usb2_base + USB2_LINECTRL1);
	290
	291	rcar_gen3_device_recognition(ch);
	292	}
	293
f3b5a8d9 YS	294	static int rcar_gen3_phy_usb2_init(struct phy *p)
	295	{
	296	struct rcar_gen3_chan *channel = phy_get_drvdata(p);
801a69c7	297	void __iomem *usb2_base = channel->base;
f3b5a8d9 YS	298
	299	/* Initialize USB2 part */
	300	writel(USB2_INT_ENABLE_INIT, usb2_base + USB2_INT_ENABLE);
	301	writel(USB2_SPD_RSM_TIMSET_INIT, usb2_base + USB2_SPD_RSM_TIMSET);
	302	writel(USB2_OC_TIMSET_INIT, usb2_base + USB2_OC_TIMSET);
	303
b9564016 YS	304	/* Initialize otg part */
b9564016 YS	305	if (channel->has_otg)
1114e2d3	306	rcar_gen3_init_otg(channel);
f3b5a8d9 YS	307
	308	return 0;
	309	}
	310
	311	static int rcar_gen3_phy_usb2_exit(struct phy *p)
	312	{
	313	struct rcar_gen3_chan *channel = phy_get_drvdata(p);
	314
801a69c7	315	writel(0, channel->base + USB2_INT_ENABLE);
f3b5a8d9 YS	316
	317	return 0;
	318	}
	319
	320	static int rcar_gen3_phy_usb2_power_on(struct phy *p)
	321	{
	322	struct rcar_gen3_chan *channel = phy_get_drvdata(p);
801a69c7	323	void __iomem *usb2_base = channel->base;
f3b5a8d9	324	u32 val;
6dcfd7c3 YS	325	int ret;
	326
	327	if (channel->vbus) {
	328	ret = regulator_enable(channel->vbus);
	329	if (ret)
	330	return ret;
	331	}
f3b5a8d9 YS	332
	333	val = readl(usb2_base + USB2_USBCTR);
	334	val \|= USB2_USBCTR_PLL_RST;
	335	writel(val, usb2_base + USB2_USBCTR);
	336	val &= ~USB2_USBCTR_PLL_RST;
	337	writel(val, usb2_base + USB2_USBCTR);
	338
f3b5a8d9 YS	339	return 0;
	340	}
	341
6dcfd7c3 YS	342	static int rcar_gen3_phy_usb2_power_off(struct phy *p)
	343	{
	344	struct rcar_gen3_chan *channel = phy_get_drvdata(p);
	345	int ret = 0;
	346
	347	if (channel->vbus)
	348	ret = regulator_disable(channel->vbus);
	349
	350	return ret;
	351	}
	352
f3b5a8d9 YS	353	static struct phy_ops rcar_gen3_phy_usb2_ops = {
	354	.init = rcar_gen3_phy_usb2_init,
	355	.exit = rcar_gen3_phy_usb2_exit,
	356	.power_on = rcar_gen3_phy_usb2_power_on,
6dcfd7c3	357	.power_off = rcar_gen3_phy_usb2_power_off,
f3b5a8d9 YS	358	.owner = THIS_MODULE,
	359	};
	360
9f391c57 YS	361	static irqreturn_t rcar_gen3_phy_usb2_irq(int irq, void *_ch)
	362	{
	363	struct rcar_gen3_chan *ch = _ch;
801a69c7	364	void __iomem *usb2_base = ch->base;
9f391c57 YS	365	u32 status = readl(usb2_base + USB2_OBINTSTA);
	366	irqreturn_t ret = IRQ_NONE;
	367
	368	if (status & USB2_OBINT_BITS) {
	369	dev_vdbg(&ch->phy->dev, "%s: %08x\n", __func__, status);
	370	writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTSTA);
	371	rcar_gen3_device_recognition(ch);
	372	ret = IRQ_HANDLED;
	373	}
	374
	375	return ret;
	376	}
	377
f3b5a8d9 YS	378	static const struct of_device_id rcar_gen3_phy_usb2_match_table[] = {
f3b5a8d9 YS	379	{ .compatible = "renesas,usb2-phy-r8a7795" },
800dcc30	380	{ .compatible = "renesas,usb2-phy-r8a7796" },
cde7bc36	381	{ .compatible = "renesas,rcar-gen3-usb2-phy" },
f3b5a8d9 YS	382	{ }
	383	};
	384	MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb2_match_table);
	385
2b38543c YS	386	static const unsigned int rcar_gen3_phy_cable[] = {
	387	EXTCON_USB,
	388	EXTCON_USB_HOST,
	389	EXTCON_NONE,
	390	};
	391
f3b5a8d9 YS	392	static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
	393	{
	394	struct device *dev = &pdev->dev;
	395	struct rcar_gen3_chan *channel;
	396	struct phy_provider *provider;
	397	struct resource *res;
b9564016	398	int irq;
f3b5a8d9 YS	399
	400	if (!dev->of_node) {
	401	dev_err(dev, "This driver needs device tree\n");
	402	return -EINVAL;
	403	}
	404
	405	channel = devm_kzalloc(dev, sizeof(*channel), GFP_KERNEL);
	406	if (!channel)
	407	return -ENOMEM;
	408
b9564016	409	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
801a69c7 YS	410	channel->base = devm_ioremap_resource(dev, res);
	411	if (IS_ERR(channel->base))
	412	return PTR_ERR(channel->base);
f3b5a8d9	413
b9564016 YS	414	/* call request_irq for OTG */
	415	irq = platform_get_irq(pdev, 0);
	416	if (irq >= 0) {
2b38543c YS	417	int ret;
2b38543c YS	418
c14f8a40	419	INIT_WORK(&channel->work, rcar_gen3_phy_usb2_work);
b9564016 YS	420	irq = devm_request_irq(dev, irq, rcar_gen3_phy_usb2_irq,
b9564016 YS	421	IRQF_SHARED, dev_name(dev), channel);
9f391c57 YS	422	if (irq < 0)
9f391c57 YS	423	dev_err(dev, "No irq handler (%d)\n", irq);
b9564016	424	channel->has_otg = true;
2b38543c YS	425	channel->extcon = devm_extcon_dev_allocate(dev,
	426	rcar_gen3_phy_cable);
	427	if (IS_ERR(channel->extcon))
	428	return PTR_ERR(channel->extcon);
	429
	430	ret = devm_extcon_dev_register(dev, channel->extcon);
	431	if (ret < 0) {
	432	dev_err(dev, "Failed to register extcon\n");
	433	return ret;
	434	}
f3b5a8d9 YS	435	}
	436
	437	/* devm_phy_create() will call pm_runtime_enable(dev); */
	438	channel->phy = devm_phy_create(dev, NULL, &rcar_gen3_phy_usb2_ops);
	439	if (IS_ERR(channel->phy)) {
	440	dev_err(dev, "Failed to create USB2 PHY\n");
	441	return PTR_ERR(channel->phy);
	442	}
	443
6dcfd7c3 YS	444	channel->vbus = devm_regulator_get_optional(dev, "vbus");
	445	if (IS_ERR(channel->vbus)) {
	446	if (PTR_ERR(channel->vbus) == -EPROBE_DEFER)
	447	return PTR_ERR(channel->vbus);
	448	channel->vbus = NULL;
	449	}
	450
9bb86777	451	platform_set_drvdata(pdev, channel);
f3b5a8d9 YS	452	phy_set_drvdata(channel->phy, channel);
	453
	454	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
9bb86777	455	if (IS_ERR(provider)) {
f3b5a8d9	456	dev_err(dev, "Failed to register PHY provider\n");
9bb86777 YS	457	} else if (channel->has_otg) {
	458	int ret;
	459
	460	ret = device_create_file(dev, &dev_attr_role);
	461	if (ret < 0)
	462	return ret;
	463	}
f3b5a8d9 YS	464
	465	return PTR_ERR_OR_ZERO(provider);
	466	}
	467
9bb86777 YS	468	static int rcar_gen3_phy_usb2_remove(struct platform_device *pdev)
	469	{
	470	struct rcar_gen3_chan *channel = platform_get_drvdata(pdev);
	471
	472	if (channel->has_otg)
	473	device_remove_file(&pdev->dev, &dev_attr_role);
	474
	475	return 0;
	476	};
	477
f3b5a8d9 YS	478	static struct platform_driver rcar_gen3_phy_usb2_driver = {
	479	.driver = {
	480	.name = "phy_rcar_gen3_usb2",
	481	.of_match_table = rcar_gen3_phy_usb2_match_table,
	482	},
	483	.probe = rcar_gen3_phy_usb2_probe,
9bb86777	484	.remove = rcar_gen3_phy_usb2_remove,
f3b5a8d9 YS	485	};
	486	module_platform_driver(rcar_gen3_phy_usb2_driver);
	487
	488	MODULE_LICENSE("GPL v2");
	489	MODULE_DESCRIPTION("Renesas R-Car Gen3 USB 2.0 PHY");
	490	MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>");