[deliverable/linux.git] / drivers / usb / host / ehci-exynos.c

/*
 * SAMSUNG EXYNOS USB HOST EHCI Controller
 *
 * Copyright (C) 2011 Samsung Electronics Co.Ltd
 * Author: Jingoo Han <jg1.han@samsung.com>
 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 */

#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>

#include "ehci.h"

#define DRIVER_DESC "EHCI EXYNOS driver"

#define EHCI_INSNREG00(base)			(base + 0x90)
#define EHCI_INSNREG00_ENA_INCR16		(0x1 << 25)
#define EHCI_INSNREG00_ENA_INCR8		(0x1 << 24)
#define EHCI_INSNREG00_ENA_INCR4		(0x1 << 23)
#define EHCI_INSNREG00_ENA_INCRX_ALIGN		(0x1 << 22)
#define EHCI_INSNREG00_ENABLE_DMA_BURST	\
	(EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 |	\
	 EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)

static const char hcd_name[] = "ehci-exynos";
static struct hc_driver __read_mostly exynos_ehci_hc_driver;

#define PHY_NUMBER 3

struct exynos_ehci_hcd {
	struct clk *clk;
	struct phy *phy[PHY_NUMBER];
};

#define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)

static int exynos_ehci_get_phy(struct device *dev,
				struct exynos_ehci_hcd *exynos_ehci)
{
	struct device_node *child;
	struct phy *phy;
	int phy_number;
	int ret;

	/* Get PHYs for the controller */
	for_each_available_child_of_node(dev->of_node, child) {
		ret = of_property_read_u32(child, "reg", &phy_number);
		if (ret) {
			dev_err(dev, "Failed to parse device tree\n");
			of_node_put(child);
			return ret;
		}

		if (phy_number >= PHY_NUMBER) {
			dev_err(dev, "Invalid number of PHYs\n");
			of_node_put(child);
			return -EINVAL;
		}

		phy = devm_of_phy_get(dev, child, NULL);
		exynos_ehci->phy[phy_number] = phy;
		if (IS_ERR(phy)) {
			ret = PTR_ERR(phy);
			if (ret == -EPROBE_DEFER) {
				return ret;
			} else if (ret != -ENOSYS && ret != -ENODEV) {
				dev_err(dev,
					"Error retrieving usb2 phy: %d\n", ret);
				return ret;
			}
		}
	}

	return 0;
}

static int exynos_ehci_phy_enable(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
	int i;
	int ret = 0;

	for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
		if (!IS_ERR(exynos_ehci->phy[i]))
			ret = phy_power_on(exynos_ehci->phy[i]);
	if (ret)
		for (i--; i >= 0; i--)
			if (!IS_ERR(exynos_ehci->phy[i]))
				phy_power_off(exynos_ehci->phy[i]);

	return ret;
}

static void exynos_ehci_phy_disable(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
	int i;

	for (i = 0; i < PHY_NUMBER; i++)
		if (!IS_ERR(exynos_ehci->phy[i]))
			phy_power_off(exynos_ehci->phy[i]);
}

static void exynos_setup_vbus_gpio(struct device *dev)
{
	int err;
	int gpio;

	if (!dev->of_node)
		return;

	gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);
	if (!gpio_is_valid(gpio))
		return;

	err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH,
				    "ehci_vbus_gpio");
	if (err)
		dev_err(dev, "can't request ehci vbus gpio %d", gpio);
}

static int exynos_ehci_probe(struct platform_device *pdev)
{
	struct exynos_ehci_hcd *exynos_ehci;
	struct usb_hcd *hcd;
	struct ehci_hcd *ehci;
	struct resource *res;
	int irq;
	int err;

	/*
	 * 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.
	 */
	err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
	if (err)
		return err;

	exynos_setup_vbus_gpio(&pdev->dev);

	hcd = usb_create_hcd(&exynos_ehci_hc_driver,
			     &pdev->dev, dev_name(&pdev->dev));
	if (!hcd) {
		dev_err(&pdev->dev, "Unable to create HCD\n");
		return -ENOMEM;
	}
	exynos_ehci = to_exynos_ehci(hcd);

	if (of_device_is_compatible(pdev->dev.of_node,
					"samsung,exynos5440-ehci"))
		goto skip_phy;

	err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci);
	if (err)
		goto fail_clk;

skip_phy:

	exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");

	if (IS_ERR(exynos_ehci->clk)) {
		dev_err(&pdev->dev, "Failed to get usbhost clock\n");
		err = PTR_ERR(exynos_ehci->clk);
		goto fail_clk;
	}

	err = clk_prepare_enable(exynos_ehci->clk);
	if (err)
		goto fail_clk;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(hcd->regs)) {
		err = PTR_ERR(hcd->regs);
		goto fail_io;
	}

	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);

	irq = platform_get_irq(pdev, 0);
	if (!irq) {
		dev_err(&pdev->dev, "Failed to get IRQ\n");
		err = -ENODEV;
		goto fail_io;
	}

	err = exynos_ehci_phy_enable(&pdev->dev);
	if (err) {
		dev_err(&pdev->dev, "Failed to enable USB phy\n");
		goto fail_io;
	}

	ehci = hcd_to_ehci(hcd);
	ehci->caps = hcd->regs;

	/* DMA burst Enable */
	writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));

	err = usb_add_hcd(hcd, irq, IRQF_SHARED);
	if (err) {
		dev_err(&pdev->dev, "Failed to add USB HCD\n");
		goto fail_add_hcd;
	}
	device_wakeup_enable(hcd->self.controller);

	platform_set_drvdata(pdev, hcd);

	return 0;

fail_add_hcd:
	exynos_ehci_phy_disable(&pdev->dev);
fail_io:
	clk_disable_unprepare(exynos_ehci->clk);
fail_clk:
	usb_put_hcd(hcd);
	return err;
}

static int exynos_ehci_remove(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);

	usb_remove_hcd(hcd);

	exynos_ehci_phy_disable(&pdev->dev);

	clk_disable_unprepare(exynos_ehci->clk);

	usb_put_hcd(hcd);

	return 0;
}

#ifdef CONFIG_PM
static int exynos_ehci_suspend(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);

	bool do_wakeup = device_may_wakeup(dev);
	int rc;

	rc = ehci_suspend(hcd, do_wakeup);
	if (rc)
		return rc;

	exynos_ehci_phy_disable(dev);

	clk_disable_unprepare(exynos_ehci->clk);

	return rc;
}

static int exynos_ehci_resume(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
	int ret;

	clk_prepare_enable(exynos_ehci->clk);

	ret = exynos_ehci_phy_enable(dev);
	if (ret) {
		dev_err(dev, "Failed to enable USB phy\n");
		clk_disable_unprepare(exynos_ehci->clk);
		return ret;
	}

	/* DMA burst Enable */
	writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));

	ehci_resume(hcd, false);
	return 0;
}
#else
#define exynos_ehci_suspend	NULL
#define exynos_ehci_resume	NULL
#endif

static const struct dev_pm_ops exynos_ehci_pm_ops = {
	.suspend	= exynos_ehci_suspend,
	.resume		= exynos_ehci_resume,
};

#ifdef CONFIG_OF
static const struct of_device_id exynos_ehci_match[] = {
	{ .compatible = "samsung,exynos4210-ehci" },
	{ .compatible = "samsung,exynos5440-ehci" },
	{},
};
MODULE_DEVICE_TABLE(of, exynos_ehci_match);
#endif

static struct platform_driver exynos_ehci_driver = {
	.probe		= exynos_ehci_probe,
	.remove		= exynos_ehci_remove,
	.shutdown	= usb_hcd_platform_shutdown,
	.driver = {
		.name	= "exynos-ehci",
		.pm	= &exynos_ehci_pm_ops,
		.of_match_table = of_match_ptr(exynos_ehci_match),
	}
};
static const struct ehci_driver_overrides exynos_overrides __initdata = {
	.extra_priv_size = sizeof(struct exynos_ehci_hcd),
};

static int __init ehci_exynos_init(void)
{
	if (usb_disabled())
		return -ENODEV;

	pr_info("%s: " DRIVER_DESC "\n", hcd_name);
	ehci_init_driver(&exynos_ehci_hc_driver, &exynos_overrides);
	return platform_driver_register(&exynos_ehci_driver);
}
module_init(ehci_exynos_init);

static void __exit ehci_exynos_cleanup(void)
{
	platform_driver_unregister(&exynos_ehci_driver);
}
module_exit(ehci_exynos_cleanup);

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_ALIAS("platform:exynos-ehci");
MODULE_AUTHOR("Jingoo Han");
MODULE_AUTHOR("Joonyoung Shim");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
1bcc5aa8	1	/*
29824c16	2	* SAMSUNG EXYNOS USB HOST EHCI Controller
1bcc5aa8 JS	3	*
	4	* Copyright (C) 2011 Samsung Electronics Co.Ltd
	5	* Author: Jingoo Han <jg1.han@samsung.com>
	6	* Author: Joonyoung Shim <jy0922.shim@samsung.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*
	13	*/
	14
	15	#include <linux/clk.h>
7edb3daf MG	16	#include <linux/dma-mapping.h>
	17	#include <linux/io.h>
	18	#include <linux/kernel.h>
	19	#include <linux/module.h>
2c026e2b	20	#include <linux/of.h>
fd81d59c	21	#include <linux/of_gpio.h>
1c17675d	22	#include <linux/phy/phy.h>
7edb3daf	23	#include <linux/platform_device.h>
7edb3daf MG	24	#include <linux/usb.h>
7edb3daf MG	25	#include <linux/usb/hcd.h>
7edb3daf MG	26
	27	#include "ehci.h"
	28
29824c16	29	#define DRIVER_DESC "EHCI EXYNOS driver"
1bcc5aa8	30
88555a63 JH	31	#define EHCI_INSNREG00(base) (base + 0x90)
	32	#define EHCI_INSNREG00_ENA_INCR16 (0x1 << 25)
	33	#define EHCI_INSNREG00_ENA_INCR8 (0x1 << 24)
	34	#define EHCI_INSNREG00_ENA_INCR4 (0x1 << 23)
	35	#define EHCI_INSNREG00_ENA_INCRX_ALIGN (0x1 << 22)
	36	#define EHCI_INSNREG00_ENABLE_DMA_BURST \
	37	(EHCI_INSNREG00_ENA_INCR16 \| EHCI_INSNREG00_ENA_INCR8 \| \
	38	EHCI_INSNREG00_ENA_INCR4 \| EHCI_INSNREG00_ENA_INCRX_ALIGN)
	39
29824c16 JH	40	static const char hcd_name[] = "ehci-exynos";
29824c16 JH	41	static struct hc_driver __read_mostly exynos_ehci_hc_driver;
7edb3daf	42
1c17675d KD	43	#define PHY_NUMBER 3
1c17675d KD	44
29824c16	45	struct exynos_ehci_hcd {
1bcc5aa8	46	struct clk *clk;
46c1cda8	47	struct phy *phy[PHY_NUMBER];
1bcc5aa8 JS	48	};
1bcc5aa8 JS	49
29824c16	50	#define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
d233c196	51
1c17675d KD	52	static int exynos_ehci_get_phy(struct device *dev,
	53	struct exynos_ehci_hcd *exynos_ehci)
	54	{
	55	struct device_node *child;
	56	struct phy *phy;
	57	int phy_number;
46c1cda8	58	int ret;
1c17675d	59
46c1cda8	60	/* Get PHYs for the controller */
1c17675d KD	61	for_each_available_child_of_node(dev->of_node, child) {
	62	ret = of_property_read_u32(child, "reg", &phy_number);
	63	if (ret) {
	64	dev_err(dev, "Failed to parse device tree\n");
	65	of_node_put(child);
	66	return ret;
	67	}
	68
	69	if (phy_number >= PHY_NUMBER) {
	70	dev_err(dev, "Invalid number of PHYs\n");
	71	of_node_put(child);
	72	return -EINVAL;
	73	}
	74
14ad5a94	75	phy = devm_of_phy_get(dev, child, NULL);
46c1cda8	76	exynos_ehci->phy[phy_number] = phy;
46c1cda8 VG	77	if (IS_ERR(phy)) {
	78	ret = PTR_ERR(phy);
	79	if (ret == -EPROBE_DEFER) {
	80	return ret;
	81	} else if (ret != -ENOSYS && ret != -ENODEV) {
	82	dev_err(dev,
	83	"Error retrieving usb2 phy: %d\n", ret);
	84	return ret;
	85	}
2f7f41c7	86	}
1c17675d KD	87	}
1c17675d KD	88
46c1cda8	89	return 0;
1c17675d KD	90	}
	91
	92	static int exynos_ehci_phy_enable(struct device *dev)
	93	{
	94	struct usb_hcd *hcd = dev_get_drvdata(dev);
	95	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
	96	int i;
	97	int ret = 0;
	98
1c17675d	99	for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
46c1cda8 VG	100	if (!IS_ERR(exynos_ehci->phy[i]))
46c1cda8 VG	101	ret = phy_power_on(exynos_ehci->phy[i]);
1c17675d KD	102	if (ret)
1c17675d KD	103	for (i--; i >= 0; i--)
46c1cda8 VG	104	if (!IS_ERR(exynos_ehci->phy[i]))
46c1cda8 VG	105	phy_power_off(exynos_ehci->phy[i]);
1c17675d KD	106
	107	return ret;
	108	}
	109
	110	static void exynos_ehci_phy_disable(struct device *dev)
	111	{
	112	struct usb_hcd *hcd = dev_get_drvdata(dev);
	113	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
	114	int i;
	115
1c17675d	116	for (i = 0; i < PHY_NUMBER; i++)
46c1cda8 VG	117	if (!IS_ERR(exynos_ehci->phy[i]))
46c1cda8 VG	118	phy_power_off(exynos_ehci->phy[i]);
1c17675d KD	119	}
1c17675d KD	120
91a9677a	121	static void exynos_setup_vbus_gpio(struct device *dev)
fd81d59c VG	122	{
	123	int err;
	124	int gpio;
	125
3f3b55bf	126	if (!dev->of_node)
fd81d59c VG	127	return;
fd81d59c VG	128
3f3b55bf	129	gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);
fd81d59c VG	130	if (!gpio_is_valid(gpio))
	131	return;
	132
3f3b55bf DA	133	err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH,
3f3b55bf DA	134	"ehci_vbus_gpio");
fd81d59c	135	if (err)
3f3b55bf	136	dev_err(dev, "can't request ehci vbus gpio %d", gpio);
fd81d59c VG	137	}
fd81d59c VG	138
29824c16	139	static int exynos_ehci_probe(struct platform_device *pdev)
1bcc5aa8	140	{
29824c16	141	struct exynos_ehci_hcd *exynos_ehci;
1bcc5aa8 JS	142	struct usb_hcd *hcd;
	143	struct ehci_hcd *ehci;
	144	struct resource *res;
	145	int irq;
	146	int err;
	147
2c026e2b VG	148	/*
	149	* Right now device-tree probed devices don't get dma_mask set.
	150	* Since shared usb code relies on it, set it here for now.
	151	* Once we move to full device tree support this will vanish off.
	152	*/
e1fd7341	153	err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
22d9d8e8 RK	154	if (err)
22d9d8e8 RK	155	return err;
2c026e2b	156
91a9677a	157	exynos_setup_vbus_gpio(&pdev->dev);
fd81d59c	158
29824c16	159	hcd = usb_create_hcd(&exynos_ehci_hc_driver,
7edb3daf MG	160	&pdev->dev, dev_name(&pdev->dev));
	161	if (!hcd) {
	162	dev_err(&pdev->dev, "Unable to create HCD\n");
1bcc5aa8	163	return -ENOMEM;
7edb3daf	164	}
29824c16	165	exynos_ehci = to_exynos_ehci(hcd);
e6b0166f TA	166
e6b0166f TA	167	if (of_device_is_compatible(pdev->dev.of_node,
57ae1605	168	"samsung,exynos5440-ehci"))
e6b0166f	169	goto skip_phy;
e6b0166f	170
1c17675d KD	171	err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci);
	172	if (err)
	173	goto fail_clk;
d233c196	174
e6b0166f TA	175	skip_phy:
e6b0166f TA	176
29824c16	177	exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
1bcc5aa8	178
29824c16	179	if (IS_ERR(exynos_ehci->clk)) {
1bcc5aa8	180	dev_err(&pdev->dev, "Failed to get usbhost clock\n");
29824c16	181	err = PTR_ERR(exynos_ehci->clk);
1bcc5aa8 JS	182	goto fail_clk;
	183	}
	184
29824c16	185	err = clk_prepare_enable(exynos_ehci->clk);
1bcc5aa8	186	if (err)
63fd0ae4	187	goto fail_clk;
1bcc5aa8 JS	188
1bcc5aa8 JS	189	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
4e24bde3 VG	190	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
	191	if (IS_ERR(hcd->regs)) {
	192	err = PTR_ERR(hcd->regs);
1bcc5aa8 JS	193	goto fail_io;
	194	}
	195
35df647c VB	196	hcd->rsrc_start = res->start;
	197	hcd->rsrc_len = resource_size(res);
	198
1bcc5aa8 JS	199	irq = platform_get_irq(pdev, 0);
	200	if (!irq) {
	201	dev_err(&pdev->dev, "Failed to get IRQ\n");
	202	err = -ENODEV;
9cb07563	203	goto fail_io;
1bcc5aa8 JS	204	}
1bcc5aa8 JS	205
1c17675d KD	206	err = exynos_ehci_phy_enable(&pdev->dev);
	207	if (err) {
	208	dev_err(&pdev->dev, "Failed to enable USB phy\n");
	209	goto fail_io;
	210	}
1bcc5aa8 JS	211
	212	ehci = hcd_to_ehci(hcd);
	213	ehci->caps = hcd->regs;
1bcc5aa8	214
88555a63 JH	215	/* DMA burst Enable */
	216	writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
	217
b5dd18d8	218	err = usb_add_hcd(hcd, irq, IRQF_SHARED);
1bcc5aa8 JS	219	if (err) {
1bcc5aa8 JS	220	dev_err(&pdev->dev, "Failed to add USB HCD\n");
d233c196	221	goto fail_add_hcd;
1bcc5aa8	222	}
3c9740a1	223	device_wakeup_enable(hcd->self.controller);
1bcc5aa8	224
bbcd85a0	225	platform_set_drvdata(pdev, hcd);
1bcc5aa8 JS	226
	227	return 0;
	228
d233c196	229	fail_add_hcd:
1c17675d	230	exynos_ehci_phy_disable(&pdev->dev);
1bcc5aa8	231	fail_io:
29824c16	232	clk_disable_unprepare(exynos_ehci->clk);
1bcc5aa8 JS	233	fail_clk:
1bcc5aa8 JS	234	usb_put_hcd(hcd);
1bcc5aa8 JS	235	return err;
	236	}
	237
29824c16	238	static int exynos_ehci_remove(struct platform_device *pdev)
1bcc5aa8	239	{
7edb3daf	240	struct usb_hcd *hcd = platform_get_drvdata(pdev);
29824c16	241	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
1bcc5aa8 JS	242
	243	usb_remove_hcd(hcd);
	244
1c17675d	245	exynos_ehci_phy_disable(&pdev->dev);
1bcc5aa8	246
29824c16	247	clk_disable_unprepare(exynos_ehci->clk);
1bcc5aa8 JS	248
1bcc5aa8 JS	249	usb_put_hcd(hcd);
1bcc5aa8 JS	250
	251	return 0;
	252	}
	253
1acb30ef	254	#ifdef CONFIG_PM
29824c16	255	static int exynos_ehci_suspend(struct device *dev)
1acb30ef	256	{
7edb3daf	257	struct usb_hcd *hcd = dev_get_drvdata(dev);
29824c16	258	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
7edb3daf	259
c5cf9212	260	bool do_wakeup = device_may_wakeup(dev);
c5cf9212	261	int rc;
1acb30ef	262
c5cf9212	263	rc = ehci_suspend(hcd, do_wakeup);
d7217510 VG	264	if (rc)
d7217510 VG	265	return rc;
1acb30ef	266
1c17675d	267	exynos_ehci_phy_disable(dev);
1acb30ef	268
29824c16	269	clk_disable_unprepare(exynos_ehci->clk);
8b4fc8c7	270
1acb30ef JH	271	return rc;
	272	}
	273
29824c16	274	static int exynos_ehci_resume(struct device *dev)
1acb30ef	275	{
7edb3daf	276	struct usb_hcd *hcd = dev_get_drvdata(dev);
29824c16	277	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
1c17675d	278	int ret;
1acb30ef	279
29824c16	280	clk_prepare_enable(exynos_ehci->clk);
8b4fc8c7	281
1c17675d KD	282	ret = exynos_ehci_phy_enable(dev);
	283	if (ret) {
	284	dev_err(dev, "Failed to enable USB phy\n");
	285	clk_disable_unprepare(exynos_ehci->clk);
	286	return ret;
	287	}
1acb30ef	288
88555a63 JH	289	/* DMA burst Enable */
	290	writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
	291
c5cf9212	292	ehci_resume(hcd, false);
1acb30ef JH	293	return 0;
	294	}
	295	#else
29824c16 JH	296	#define exynos_ehci_suspend NULL
29824c16 JH	297	#define exynos_ehci_resume NULL
1acb30ef JH	298	#endif
1acb30ef JH	299
29824c16 JH	300	static const struct dev_pm_ops exynos_ehci_pm_ops = {
	301	.suspend = exynos_ehci_suspend,
	302	.resume = exynos_ehci_resume,
1acb30ef JH	303	};
1acb30ef JH	304
2c026e2b VG	305	#ifdef CONFIG_OF
2c026e2b VG	306	static const struct of_device_id exynos_ehci_match[] = {
6e247777	307	{ .compatible = "samsung,exynos4210-ehci" },
e6b0166f	308	{ .compatible = "samsung,exynos5440-ehci" },
2c026e2b VG	309	{},
	310	};
	311	MODULE_DEVICE_TABLE(of, exynos_ehci_match);
	312	#endif
	313
29824c16 JH	314	static struct platform_driver exynos_ehci_driver = {
	315	.probe = exynos_ehci_probe,
	316	.remove = exynos_ehci_remove,
aaf6b52d	317	.shutdown = usb_hcd_platform_shutdown,
1bcc5aa8	318	.driver = {
29824c16	319	.name = "exynos-ehci",
29824c16	320	.pm = &exynos_ehci_pm_ops,
2c026e2b	321	.of_match_table = of_match_ptr(exynos_ehci_match),
1bcc5aa8 JS	322	}
1bcc5aa8 JS	323	};
29824c16 JH	324	static const struct ehci_driver_overrides exynos_overrides __initdata = {
29824c16 JH	325	.extra_priv_size = sizeof(struct exynos_ehci_hcd),
7edb3daf MG	326	};
7edb3daf MG	327
29824c16	328	static int __init ehci_exynos_init(void)
7edb3daf MG	329	{
	330	if (usb_disabled())
	331	return -ENODEV;
	332
	333	pr_info("%s: " DRIVER_DESC "\n", hcd_name);
29824c16 JH	334	ehci_init_driver(&exynos_ehci_hc_driver, &exynos_overrides);
29824c16 JH	335	return platform_driver_register(&exynos_ehci_driver);
7edb3daf	336	}
29824c16	337	module_init(ehci_exynos_init);
7edb3daf	338
29824c16	339	static void __exit ehci_exynos_cleanup(void)
7edb3daf	340	{
29824c16	341	platform_driver_unregister(&exynos_ehci_driver);
7edb3daf	342	}
29824c16	343	module_exit(ehci_exynos_cleanup);
1bcc5aa8	344
7edb3daf	345	MODULE_DESCRIPTION(DRIVER_DESC);
29824c16	346	MODULE_ALIAS("platform:exynos-ehci");
7edb3daf MG	347	MODULE_AUTHOR("Jingoo Han");
	348	MODULE_AUTHOR("Joonyoung Shim");
	349	MODULE_LICENSE("GPL v2");