/**
 * dwc3-exynos.c - Samsung EXYNOS DWC3 Specific Glue layer
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com
 *
 * Author: Anton Tikhomirov <av.tikhomirov@samsung.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2  of
 * the License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/platform_data/dwc3-exynos.h>
#include <linux/mutex.h>
#include <linux/dma-mapping.h>
#include <linux/clk.h>
#include <linux/usb/otg.h>
#include <linux/usb/usb_phy_generic.h>
#include <linux/usb/samsung_usb.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/regulator/consumer.h>
#include <linux/workqueue.h>
#include <linux/of_gpio.h>

#include <linux/io.h>
#include <linux/pinctrl/consumer.h>
#include <linux/usb/otg-fsm.h>
#include <linux/pm_qos.h>

#include <soc/samsung/exynos-powermode.h>

/**
 * Clocks to use DWC3 DRD in Exynos SoC
 */
static const char *dwc3_exynos5_clk_names[] = {"aclk", "aclk_axius", "sclk_ref",
	"sclk", "oscclk_phy", "phyclock", "pipe_pclk", "aclk_ahb_usblinkh", NULL};
static const char *dwc3_exynos8890_clk_names[] = {"aclk", "sclk",
				"phyclock", "pipe_pclk", NULL};
static const char *dwc2_exynos8890_clk_names[] = {"aclk", "sclk",
				"phyclock", "phy_ref", NULL};
static const char *dwc2_exynos7870_clk_names[] = {"usbdrd20", NULL};
static const char *dwc2_exynos7570_clk_names[] = {"usbdrd20", NULL};

/**
 * Structures for Samsung Exynos DWC3 glue layer
 */
struct dwc3_exynos_rsw {
	struct otg_fsm		*fsm;
	struct work_struct	work;
	int			id_gpio;
	int			b_sess_gpio;
};

struct dwc3_exynos_drvdata {
	int cpu_type;
	int ip_type;
};

struct dwc3_exynos {
	struct platform_device	*usb2_phy;
	struct platform_device	*usb3_phy;
	struct device		*dev;

	struct regulator	*vdd33;
	struct regulator	*vdd10;

	struct clk		*clk;
	struct clk		**clocks;

	int			idle_ip_index;

	struct dwc3_exynos_rsw	rsw;
	const struct dwc3_exynos_drvdata *drv_data;

#ifdef CONFIG_PM_DEVFREQ
	unsigned int int_min_lock;
#endif
};
void dwc3_otg_run_sm(struct otg_fsm *fsm);

#ifdef CONFIG_OF
static struct dwc3_exynos_drvdata dwc3_exynos5250 = {
	.cpu_type	= TYPE_EXYNOS5250,
};

static struct dwc3_exynos_drvdata dwc3_exynos5 = {
	.cpu_type	= TYPE_EXYNOS5,
};

static struct dwc3_exynos_drvdata dwc3_exynos8890 = {
	.cpu_type	= TYPE_EXYNOS8890,
	.ip_type	= TYPE_USB3DRD,
};

static struct dwc3_exynos_drvdata dwc2_exynos8890 = {
	.cpu_type	= TYPE_EXYNOS8890,
	.ip_type	= TYPE_USB2HOST,
};

static struct dwc3_exynos_drvdata dwc2_exynos7870 = {
	.cpu_type	= TYPE_EXYNOS7870,
};

static struct dwc3_exynos_drvdata dwc2_exynos7570 = {
	.cpu_type	= TYPE_EXYNOS7570,
};

static const struct of_device_id exynos_dwc3_match[] = {
	{
		.compatible = "samsung,exynos5250-dwusb3",
		.data = &dwc3_exynos5250,
	}, {
		.compatible = "samsung,exynos5-dwusb3",
		.data = &dwc3_exynos5,
	}, {
		.compatible = "samsung,exynos8890-dwusb3",
		.data = &dwc3_exynos8890,
	}, {
		.compatible = "samsung,exynos8890-dwusb2",
		.data = &dwc2_exynos8890,
	}, {
		.compatible = "samsung,exynos7870-dwusb2",
		.data = &dwc2_exynos7870,
	}, {
		.compatible = "samsung,exynos7570-dwusb2",
		.data = &dwc2_exynos7570,
	},
	{},
};
MODULE_DEVICE_TABLE(of, exynos_dwc3_match);

#ifdef CONFIG_PM_DEVFREQ
static struct pm_qos_request exynos_usb_int_qos;
#endif

static inline const struct dwc3_exynos_drvdata
*dwc3_exynos_get_driver_data(struct platform_device *pdev)
{
	if (pdev->dev.of_node) {
		const struct of_device_id *match;
		match = of_match_node(exynos_dwc3_match, pdev->dev.of_node);
		return match->data;
	}

	return NULL;
}
#endif

static inline int dwc3_exynos_get_id_state(struct dwc3_exynos_rsw *rsw)
{
	return gpio_get_value(rsw->id_gpio);
}

static inline int dwc3_exynos_get_b_sess_state(struct dwc3_exynos_rsw *rsw)
{
	return gpio_get_value(rsw->b_sess_gpio);
}

static irqreturn_t dwc3_exynos_rsw_thread_interrupt(int irq, void *_rsw)
{
	struct dwc3_exynos_rsw	*rsw = (struct dwc3_exynos_rsw *)_rsw;
	struct dwc3_exynos	*exynos = container_of(rsw,
						struct dwc3_exynos, rsw);

	dev_vdbg(exynos->dev, "%s\n", __func__);

	dwc3_otg_run_sm(rsw->fsm);

	return IRQ_HANDLED;
}

static void dwc3_exynos_rsw_work(struct work_struct *w)
{
	struct dwc3_exynos_rsw	*rsw = container_of(w,
					struct dwc3_exynos_rsw, work);

	dwc3_exynos_rsw_thread_interrupt(-1, rsw);
}

static irqreturn_t dwc3_exynos_id_interrupt(int irq, void *_rsw)
{
	struct dwc3_exynos_rsw	*rsw = (struct dwc3_exynos_rsw *)_rsw;
	struct dwc3_exynos	*exynos = container_of(rsw,
						struct dwc3_exynos, rsw);
	int			state;

	state = dwc3_exynos_get_id_state(rsw);

	dev_vdbg(exynos->dev, "IRQ: ID: %d\n", state);

	if (rsw->fsm->id != state) {
		rsw->fsm->id = state;
		return IRQ_WAKE_THREAD;
	}

	return IRQ_NONE;
}

static irqreturn_t dwc3_exynos_b_sess_interrupt(int irq, void *_rsw)
{
	struct dwc3_exynos_rsw	*rsw = (struct dwc3_exynos_rsw *)_rsw;
	struct dwc3_exynos	*exynos = container_of(rsw,
						struct dwc3_exynos, rsw);
	int			state;

	state = dwc3_exynos_get_b_sess_state(rsw);

	dev_vdbg(exynos->dev, "IRQ: B_Sess: %sactive\n", state ? "" : "in");

	if (rsw->fsm->b_sess_vld != state) {
		rsw->fsm->b_sess_vld = state;
		return IRQ_WAKE_THREAD;
	}

	return IRQ_NONE;
}

/**
 * dwc3_exynos_id_event - receive ID pin state change event.
 *
 * @state : New ID pin state.
 */
int dwc3_exynos_id_event(struct device *dev, int state)
{
	struct dwc3_exynos	*exynos;
	struct dwc3_exynos_rsw	*rsw;
	struct otg_fsm		*fsm;

	dev_dbg(dev, "EVENT: ID: %d\n", state);

	exynos = dev_get_drvdata(dev);
	if (!exynos)
		return -ENOENT;

	rsw = &exynos->rsw;

	fsm = rsw->fsm;
	if (!fsm)
		return -ENOENT;

	if (fsm->id != state) {
		fsm->id = state;
		schedule_work(&rsw->work);
	}

	return 0;
}
EXPORT_SYMBOL_GPL(dwc3_exynos_id_event);

/**
 * dwc3_exynos_vbus_event - receive VBus change event.
 *
 * vbus_active : New VBus state, true if active, false otherwise.
 */
int dwc3_exynos_vbus_event(struct device *dev, bool vbus_active)
{
	struct dwc3_exynos	*exynos;
	struct dwc3_exynos_rsw	*rsw;
	struct otg_fsm		*fsm;

	dev_dbg(dev, "EVENT: VBUS: %sactive\n", vbus_active ? "" : "in");

	exynos = dev_get_drvdata(dev);
	if (!exynos)
		return -ENOENT;

	rsw = &exynos->rsw;

	fsm = rsw->fsm;
	if (!fsm)
		return -ENOENT;

	if (fsm->b_sess_vld != vbus_active) {
		fsm->b_sess_vld = vbus_active;
		schedule_work(&rsw->work);
	}

	return 0;
}
EXPORT_SYMBOL_GPL(dwc3_exynos_vbus_event);

int dwc3_exynos_rsw_start(struct device *dev)
{
	struct dwc3_exynos	*exynos = dev_get_drvdata(dev);
	struct dwc3_exynos_rsw	*rsw = &exynos->rsw;
	unsigned long		irq_flags = IRQF_TRIGGER_RISING |
					    IRQF_TRIGGER_FALLING;
	int			irq;
	int			ret;

	dev_dbg(dev, "%s\n", __func__);

	if (gpio_is_valid(rsw->id_gpio)) {
		rsw->fsm->id = dwc3_exynos_get_id_state(rsw);

		irq = gpio_to_irq(rsw->id_gpio);
		ret = devm_request_threaded_irq(exynos->dev, irq,
					dwc3_exynos_id_interrupt,
					dwc3_exynos_rsw_thread_interrupt,
					irq_flags, "dwc3_id", rsw);
		if (ret) {
			dev_err(exynos->dev, "failed to request irq #%d --> %d\n",
					irq, ret);
			return ret;
		}
	}

	if (gpio_is_valid(rsw->b_sess_gpio)) {
		rsw->fsm->b_sess_vld = dwc3_exynos_get_b_sess_state(rsw);

		irq = gpio_to_irq(rsw->b_sess_gpio);
		ret = devm_request_threaded_irq(exynos->dev, irq,
					dwc3_exynos_b_sess_interrupt,
					dwc3_exynos_rsw_thread_interrupt,
					irq_flags, "dwc3_b_sess", rsw);
		if (ret) {
			dev_err(exynos->dev, "failed to request irq #%d --> %d\n",
					irq, ret);
			return ret;
		}
	}

	return 0;
}

void dwc3_exynos_rsw_stop(struct device *dev)
{
	struct dwc3_exynos	*exynos = dev_get_drvdata(dev);
	struct dwc3_exynos_rsw	*rsw = &exynos->rsw;
	int	irq;

	dev_dbg(dev, "%s\n", __func__);

	if (gpio_is_valid(rsw->id_gpio)) {
		irq = gpio_to_irq(rsw->id_gpio);
		devm_free_irq(exynos->dev, irq, rsw);
	}
	if (gpio_is_valid(rsw->b_sess_gpio)) {
		irq = gpio_to_irq(rsw->b_sess_gpio);
		devm_free_irq(exynos->dev, irq, rsw);
	}
}


int dwc3_exynos_rsw_setup(struct device *dev, struct otg_fsm *fsm)
{
	struct dwc3_exynos	*exynos = dev_get_drvdata(dev);
	struct dwc3_exynos_rsw	*rsw = &exynos->rsw;
	int			ret;

	dev_dbg(dev, "%s\n", __func__);

	if (gpio_is_valid(rsw->id_gpio)) {
		ret = devm_gpio_request(exynos->dev, rsw->id_gpio,
						"dwc3_id_gpio");
		if (ret) {
			dev_err(exynos->dev, "failed to request dwc3 id gpio");
			return ret;
		}
	}

	if (gpio_is_valid(rsw->b_sess_gpio)) {
		ret = devm_gpio_request_one(exynos->dev, rsw->b_sess_gpio,
						GPIOF_IN, "dwc3_b_sess_gpio");
		if (ret) {
			dev_err(exynos->dev, "failed to request dwc3 b_sess gpio");
			return ret;
		}
	}

	INIT_WORK(&rsw->work, dwc3_exynos_rsw_work);

	/* B-device by default */
	fsm->id = 1;
	/* Not connected by default */
	fsm->b_sess_vld = 0;

	rsw->fsm = fsm;

	return 0;
}

void dwc3_exynos_rsw_exit(struct device *dev)
{
	struct dwc3_exynos	*exynos = dev_get_drvdata(dev);
	struct dwc3_exynos_rsw	*rsw = &exynos->rsw;

	dev_dbg(dev, "%s\n", __func__);

	cancel_work_sync(&rsw->work);

 	rsw->fsm = NULL;
}

static struct dwc3_exynos *dwc3_exynos_match(struct device *dev)
{
	struct dwc3_exynos		*exynos = NULL;
	const struct of_device_id	*matches = NULL;

	if (!dev)
		return NULL;

#if IS_ENABLED(CONFIG_OF)
	matches = exynos_dwc3_match;
#endif
	if (of_match_device(matches, dev))
		exynos = dev_get_drvdata(dev);

	return exynos;
}

bool dwc3_exynos_rsw_available(struct device *dev)
{
	struct dwc3_exynos	*exynos;

	exynos = dwc3_exynos_match(dev);
	if (!exynos)
		return false;

	return true;
}


static void dwc3_exynos_rsw_init(struct dwc3_exynos *exynos)
{
	struct device		*dev = exynos->dev;
	struct dwc3_exynos_rsw	*rsw = &exynos->rsw;
	struct pinctrl		*pinctrl;

	if (!dev->of_node)
		return;

	/* ID gpio */
	rsw->id_gpio = of_get_named_gpio(dev->of_node,
					"samsung,id-gpio", 0);
	if (!gpio_is_valid(rsw->id_gpio))
		dev_info(dev, "id gpio is not available\n");

	/* B-Session gpio */
	rsw->b_sess_gpio = of_get_named_gpio(dev->of_node,
					"samsung,bsess-gpio", 0);
	if (!gpio_is_valid(rsw->b_sess_gpio))
		dev_info(dev, "b_sess gpio is not available\n");

	pinctrl = devm_pinctrl_get_select_default(dev);
	if (IS_ERR(pinctrl))
		dev_info(exynos->dev, "failed to configure pins\n");
}

static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
{
	struct usb_phy_generic_platform_data pdata;
	struct platform_device	*pdev;
	int			ret;

	memset(&pdata, 0x00, sizeof(pdata));

	pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
	if (!pdev)
		return -ENOMEM;

	exynos->usb2_phy = pdev;
	pdata.type = USB_PHY_TYPE_USB2;
	pdata.gpio_reset = -1;

	ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
	if (ret)
		goto err1;

	pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
	if (!pdev) {
		ret = -ENOMEM;
		goto err1;
	}

	exynos->usb3_phy = pdev;
	pdata.type = USB_PHY_TYPE_USB3;

	ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
	if (ret)
		goto err2;

	ret = platform_device_add(exynos->usb2_phy);
	if (ret)
		goto err2;

	ret = platform_device_add(exynos->usb3_phy);
	if (ret)
		goto err3;

	return 0;

err3:
	platform_device_del(exynos->usb2_phy);

err2:
	platform_device_put(exynos->usb3_phy);

err1:
	platform_device_put(exynos->usb2_phy);

	return ret;
}

static int dwc3_exynos_remove_child(struct device *dev, void *unused)
{
	struct platform_device *pdev = to_platform_device(dev);

	platform_device_unregister(pdev);

	return 0;
}

static int dwc3_exynos_clk_prepare(struct dwc3_exynos *exynos)
{
	int i;
	int ret;

	if (exynos->clk) {
		ret = clk_prepare(exynos->clk);
		if (ret)
			return ret;
	} else {
		for (i = 0; exynos->clocks[i] != NULL; i++) {
			ret = clk_prepare(exynos->clocks[i]);
			if (ret)
				goto err;
		}
	}

	return 0;

err:
	/* roll back */
	for (i = i - 1; i >= 0; i--)
		clk_unprepare(exynos->clocks[i]);

	return ret;
}

static int dwc3_exynos_clk_enable(struct dwc3_exynos *exynos)
{
	int i;
	int ret;

	if (exynos->clk) {
		ret = clk_enable(exynos->clk);
		if (ret)
			return ret;
	} else {
		for (i = 0; exynos->clocks[i] != NULL; i++) {
			ret = clk_enable(exynos->clocks[i]);
			if (ret)
				goto err;
		}
	}

	return 0;

err:
	/* roll back */
	for (i = i - 1; i >= 0; i--)
		clk_disable(exynos->clocks[i]);

	return ret;
}

static void dwc3_exynos_clk_unprepare(struct dwc3_exynos *exynos)
{
	int	i;

	if (exynos->clk) {
		clk_unprepare(exynos->clk);
	} else {
		for (i = 0; exynos->clocks[i] != NULL; i++)
			clk_unprepare(exynos->clocks[i]);
	}
}

static void dwc3_exynos_clk_disable(struct dwc3_exynos *exynos)
{
	int	i;

	if (exynos->clk) {
		clk_disable(exynos->clk);
	} else {
		for (i = 0; exynos->clocks[i] != NULL; i++)
			clk_disable(exynos->clocks[i]);
	}
}

static int dwc3_exynos_clk_get(struct dwc3_exynos *exynos)
{
	const char	**clk_ids;
	const char	*clk_id;
	struct clk	*clk;
	int		clk_count;
	int		i;

	clk_id = "usbdrd30";
	clk = devm_clk_get(exynos->dev, clk_id);
	if (!IS_ERR_OR_NULL(clk)) {
		exynos->clk = clk;
		return 0;
	}

	dev_info(exynos->dev, "IP clock gating is N/A\n");
	exynos->clk = NULL;

	/* fallback to separate clock control */
	switch (exynos->drv_data->cpu_type) {
	case TYPE_EXYNOS8890:
		if (exynos->drv_data->ip_type == TYPE_USB3DRD) {
			clk_ids = dwc3_exynos8890_clk_names;
			clk_count = ARRAY_SIZE(dwc3_exynos8890_clk_names);
		} else {
			clk_ids = dwc2_exynos8890_clk_names;
			clk_count = ARRAY_SIZE(dwc2_exynos8890_clk_names);
		}
		break;
	case TYPE_EXYNOS5:
		clk_ids = dwc3_exynos5_clk_names;
		clk_count = ARRAY_SIZE(dwc3_exynos5_clk_names);
		break;
	case TYPE_EXYNOS7870:
               clk_ids = dwc2_exynos7870_clk_names;
               clk_count = ARRAY_SIZE(dwc2_exynos7870_clk_names);
               break;
	case TYPE_EXYNOS7570:
               clk_ids = dwc2_exynos7570_clk_names;
               clk_count = ARRAY_SIZE(dwc2_exynos7570_clk_names);
               break;
	default:
		dev_err(exynos->dev, "couldn't get clock : unknown cpu type\n");
		return -EINVAL;
	}

	exynos->clocks = (struct clk **) devm_kmalloc(exynos->dev,
			clk_count * sizeof(struct clk *), GFP_KERNEL);
	if (!exynos->clocks)
		return -ENOMEM;

	for (i = 0; clk_ids[i] != NULL; i++) {
		clk = devm_clk_get(exynos->dev, clk_ids[i]);
		if (IS_ERR_OR_NULL(clk))
			goto err;

		exynos->clocks[i] = clk;
	}
	exynos->clocks[i] = NULL;

	return 0;
err:
	dev_err(exynos->dev, "couldn't get %s clock\n", clk_ids[i]);
	return -EINVAL;
}

static int dwc3_exynos_probe(struct platform_device *pdev)
{
	struct dwc3_exynos	*exynos;
	struct device		*dev = &pdev->dev;
	struct device_node	*node = dev->of_node;

	int			ret;

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

	/*
	 * Right now device-tree probed devices don't get dma_mask set.
	 * Since shared usb code relies on it, set it here for now.
	 * Once we move to full device tree support this will vanish off.
	 */
	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
	if (ret)
		return ret;

	platform_set_drvdata(pdev, exynos);

	ret = dwc3_exynos_register_phys(exynos);
	if (ret) {
		dev_err(dev, "couldn't register PHYs\n");
		return ret;
	}

	exynos->dev	= dev;
#if IS_ENABLED(CONFIG_OF)
	exynos->drv_data = dwc3_exynos_get_driver_data(pdev);
#endif
	if (!exynos->drv_data) {
		dev_info(exynos->dev,
			"%s fail: drv_data is not available\n", __func__);
		return -EINVAL;
	}

	exynos->idle_ip_index = exynos_get_idle_ip_index(dev_name(dev));
	exynos_update_ip_idle_status(exynos->idle_ip_index, 0);

#ifdef CONFIG_PM_DEVFREQ
	if (of_property_read_u32(node, "usb-pm-qos-int", &exynos->int_min_lock))
		exynos->int_min_lock = 0;

	if (exynos->int_min_lock)
		pm_qos_add_request(&exynos_usb_int_qos, PM_QOS_DEVICE_THROUGHPUT, 0);
#endif
	ret = dwc3_exynos_clk_get(exynos);
	if (ret)
		return ret;

	dwc3_exynos_clk_prepare(exynos);
	dwc3_exynos_clk_enable(exynos);

	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);

	dwc3_exynos_rsw_init(exynos);

	exynos->vdd33 = devm_regulator_get(dev, "vdd33");
	if (IS_ERR(exynos->vdd33)) {
		dev_dbg(dev, "couldn't get regulator vdd33\n");
		exynos->vdd33 = NULL;
	}
	if (exynos->vdd33) {
		ret = regulator_enable(exynos->vdd33);
		if (ret) {
			dev_err(dev, "Failed to enable VDD33 supply\n");
			goto err2;
		}
	}

	exynos->vdd10 = devm_regulator_get(dev, "vdd10");
	if (IS_ERR(exynos->vdd10)) {
		dev_dbg(dev, "couldn't get regulator vdd10\n");
		exynos->vdd10 = NULL;
	}
	if (exynos->vdd10) {
		ret = regulator_enable(exynos->vdd10);
		if (ret) {
			dev_err(dev, "Failed to enable VDD10 supply\n");
			goto err3;
		}
	}

	if (node) {
		ret = of_platform_populate(node, NULL, NULL, dev);
		if (ret) {
			dev_err(dev, "failed to add dwc3 core\n");
			goto err4;
		}
	} else {
		dev_err(dev, "no device node, failed to add dwc3 core\n");
		ret = -ENODEV;
		goto err4;
	}

	return 0;

err4:
	if (exynos->vdd10)
		regulator_disable(exynos->vdd10);
err3:
	if (exynos->vdd33)
		regulator_disable(exynos->vdd33);
err2:
	pm_runtime_disable(&pdev->dev);
	dwc3_exynos_clk_disable(exynos);
	dwc3_exynos_clk_unprepare(exynos);
	pm_runtime_set_suspended(&pdev->dev);
	return ret;
}

static int dwc3_exynos_remove(struct platform_device *pdev)
{
	struct dwc3_exynos	*exynos = platform_get_drvdata(pdev);

	device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
	platform_device_unregister(exynos->usb2_phy);
	platform_device_unregister(exynos->usb3_phy);

	if (exynos->vdd33)
		regulator_disable(exynos->vdd33);
	if (exynos->vdd10)
		regulator_disable(exynos->vdd10);

	pm_runtime_disable(&pdev->dev);
	if (!pm_runtime_status_suspended(&pdev->dev)) {
		dwc3_exynos_clk_disable(exynos);
		pm_runtime_set_suspended(&pdev->dev);
	}
	dwc3_exynos_clk_unprepare(exynos);

	return 0;
}

#ifdef CONFIG_PM_RUNTIME
static int dwc3_exynos_runtime_suspend(struct device *dev)
{
	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
#ifdef CONFIG_USB_DEBUG_DETAILED_LOG
	dev_info(dev, "%s\n", __func__);
#else
	dev_dbg(dev, "%s\n", __func__);
#endif
	dwc3_exynos_clk_disable(exynos);

	/* inform what USB state is idle to IDLE_IP */
	exynos_update_ip_idle_status(exynos->idle_ip_index, 1);

#ifdef CONFIG_PM_DEVFREQ
	if (exynos->int_min_lock)
		pm_qos_update_request(&exynos_usb_int_qos, 0);
#endif
	return 0;
}

static int dwc3_exynos_runtime_resume(struct device *dev)
{
	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
	int ret = 0;
#ifdef CONFIG_USB_DEBUG_DETAILED_LOG
	dev_info(dev, "%s\n", __func__);
#else
	dev_dbg(dev, "%s\n", __func__);
#endif

#ifdef CONFIG_PM_DEVFREQ
	if (exynos->int_min_lock)
		pm_qos_update_request(&exynos_usb_int_qos,
					exynos->int_min_lock);
#endif
	/* inform what USB state is not idle to IDLE_IP */
	exynos_update_ip_idle_status(exynos->idle_ip_index, 0);

	ret = dwc3_exynos_clk_enable(exynos);
	if (ret) {
		dev_err(dev, "%s: clk_enable failed\n", __func__);
		return ret;
	}

	return 0;
}
#endif

#ifdef CONFIG_PM_SLEEP
static int dwc3_exynos_suspend(struct device *dev)
{
	struct dwc3_exynos *exynos = dev_get_drvdata(dev);

	dev_dbg(dev, "%s\n", __func__);

	if (pm_runtime_suspended(dev))
		return 0;

	dwc3_exynos_clk_disable(exynos);

	if (exynos->vdd33)
		regulator_disable(exynos->vdd33);
	if (exynos->vdd10)
		regulator_disable(exynos->vdd10);

	return 0;
}

static int dwc3_exynos_resume(struct device *dev)
{
	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
	int ret = 0;

	if (exynos->vdd33) {
		ret = regulator_enable(exynos->vdd33);
		if (ret) {
			dev_err(dev, "Failed to enable VDD33 supply\n");
			return ret;
		}
	}
	if (exynos->vdd10) {
		ret = regulator_enable(exynos->vdd10);
		if (ret) {
			dev_err(dev, "Failed to enable VDD10 supply\n");
			return ret;
		}
	}
	dev_dbg(dev, "%s\n", __func__);

	ret = dwc3_exynos_clk_enable(exynos);
	if (ret) {
		dev_err(dev, "%s: clk_enable failed\n", __func__);
		return ret;
	}

	/* runtime set active to reflect active state. */
	pm_runtime_disable(dev);
	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);

	return 0;
}

static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
	SET_RUNTIME_PM_OPS(dwc3_exynos_runtime_suspend,
			dwc3_exynos_runtime_resume, NULL)
};

#define DEV_PM_OPS	(&dwc3_exynos_dev_pm_ops)
#else
#define DEV_PM_OPS	NULL
#endif /* CONFIG_PM_SLEEP */

static struct platform_driver dwc3_exynos_driver = {
	.probe		= dwc3_exynos_probe,
	.remove		= dwc3_exynos_remove,
	.driver		= {
		.name	= "exynos-dwc3",
		.of_match_table = of_match_ptr(exynos_dwc3_match),
		.pm	= DEV_PM_OPS,
	},
};

module_platform_driver(dwc3_exynos_driver);

MODULE_ALIAS("platform:exynos-dwc3");
MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");