[deliverable/linux.git] / drivers / usb / otg / mxs-phy.c

/*
 * Copyright 2012 Freescale Semiconductor, Inc.
 * Copyright (C) 2012 Marek Vasut <marex@denx.de>
 * on behalf of DENX Software Engineering GmbH
 *
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/usb/otg.h>
#include <linux/stmp_device.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>

#define DRIVER_NAME "mxs_phy"

#define HW_USBPHY_PWD				0x00
#define HW_USBPHY_CTRL				0x30
#define HW_USBPHY_CTRL_SET			0x34
#define HW_USBPHY_CTRL_CLR			0x38

#define BM_USBPHY_CTRL_SFTRST			BIT(31)
#define BM_USBPHY_CTRL_CLKGATE			BIT(30)
#define BM_USBPHY_CTRL_ENUTMILEVEL3		BIT(15)
#define BM_USBPHY_CTRL_ENUTMILEVEL2		BIT(14)
#define BM_USBPHY_CTRL_ENHOSTDISCONDETECT	BIT(1)

struct mxs_phy {
	struct usb_phy phy;
	struct clk *clk;
};

#define to_mxs_phy(p) container_of((p), struct mxs_phy, phy)

static void mxs_phy_hw_init(struct mxs_phy *mxs_phy)
{
	void __iomem *base = mxs_phy->phy.io_priv;

	stmp_reset_block(base + HW_USBPHY_CTRL);

	/* Power up the PHY */
	writel_relaxed(0, base + HW_USBPHY_PWD);

	/* enable FS/LS device */
	writel_relaxed(BM_USBPHY_CTRL_ENUTMILEVEL2 |
			BM_USBPHY_CTRL_ENUTMILEVEL3,
			base + HW_USBPHY_CTRL_SET);
}

static int mxs_phy_init(struct usb_phy *phy)
{
	struct mxs_phy *mxs_phy = to_mxs_phy(phy);

	clk_prepare_enable(mxs_phy->clk);
	mxs_phy_hw_init(mxs_phy);

	return 0;
}

static void mxs_phy_shutdown(struct usb_phy *phy)
{
	struct mxs_phy *mxs_phy = to_mxs_phy(phy);

	writel_relaxed(BM_USBPHY_CTRL_CLKGATE,
			phy->io_priv + HW_USBPHY_CTRL_SET);

	clk_disable_unprepare(mxs_phy->clk);
}

static int mxs_phy_on_connect(struct usb_phy *phy,
		enum usb_device_speed speed)
{
	dev_dbg(phy->dev, "%s speed device has connected\n",
		(speed == USB_SPEED_HIGH) ? "high" : "non-high");

	if (speed == USB_SPEED_HIGH)
		writel_relaxed(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
				phy->io_priv + HW_USBPHY_CTRL_SET);

	return 0;
}

static int mxs_phy_on_disconnect(struct usb_phy *phy,
		enum usb_device_speed speed)
{
	dev_dbg(phy->dev, "%s speed device has disconnected\n",
		(speed == USB_SPEED_HIGH) ? "high" : "non-high");

	if (speed == USB_SPEED_HIGH)
		writel_relaxed(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
				phy->io_priv + HW_USBPHY_CTRL_CLR);

	return 0;
}

static int mxs_phy_probe(struct platform_device *pdev)
{
	struct resource *res;
	void __iomem *base;
	struct clk *clk;
	struct mxs_phy *mxs_phy;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "can't get device resources\n");
		return -ENOENT;
	}

	base = devm_request_and_ioremap(&pdev->dev, res);
	if (!base)
		return -EBUSY;

	clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(clk)) {
		dev_err(&pdev->dev,
			"can't get the clock, err=%ld", PTR_ERR(clk));
		return PTR_ERR(clk);
	}

	mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL);
	if (!mxs_phy) {
		dev_err(&pdev->dev, "Failed to allocate USB PHY structure!\n");
		return -ENOMEM;
	}

	mxs_phy->phy.io_priv		= base;
	mxs_phy->phy.dev		= &pdev->dev;
	mxs_phy->phy.label		= DRIVER_NAME;
	mxs_phy->phy.init		= mxs_phy_init;
	mxs_phy->phy.shutdown		= mxs_phy_shutdown;
	mxs_phy->phy.notify_connect	= mxs_phy_on_connect;
	mxs_phy->phy.notify_disconnect	= mxs_phy_on_disconnect;

	ATOMIC_INIT_NOTIFIER_HEAD(&mxs_phy->phy.notifier);

	mxs_phy->clk = clk;

	platform_set_drvdata(pdev, &mxs_phy->phy);

	return 0;
}

static int mxs_phy_remove(struct platform_device *pdev)
{
	platform_set_drvdata(pdev, NULL);

	return 0;
}

static const struct of_device_id mxs_phy_dt_ids[] = {
	{ .compatible = "fsl,imx23-usbphy", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);

static struct platform_driver mxs_phy_driver = {
	.probe = mxs_phy_probe,
	.remove = mxs_phy_remove,
	.driver = {
		.name = DRIVER_NAME,
		.owner	= THIS_MODULE,
		.of_match_table = mxs_phy_dt_ids,
	 },
};

static int __init mxs_phy_module_init(void)
{
	return platform_driver_register(&mxs_phy_driver);
}
postcore_initcall(mxs_phy_module_init);

static void __exit mxs_phy_module_exit(void)
{
	platform_driver_unregister(&mxs_phy_driver);
}
module_exit(mxs_phy_module_exit);

MODULE_ALIAS("platform:mxs-usb-phy");
MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
MODULE_DESCRIPTION("Freescale MXS USB PHY driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
b3d99681 RZ	1	/*
	2	* Copyright 2012 Freescale Semiconductor, Inc.
	3	* Copyright (C) 2012 Marek Vasut <marex@denx.de>
	4	* on behalf of DENX Software Engineering GmbH
	5	*
	6	* The code contained herein is licensed under the GNU General Public
	7	* License. You may obtain a copy of the GNU General Public License
	8	* Version 2 or later at the following locations:
	9	*
	10	* http://www.opensource.org/licenses/gpl-license.html
	11	* http://www.gnu.org/copyleft/gpl.html
	12	*/
	13
	14	#include <linux/module.h>
	15	#include <linux/kernel.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/clk.h>
	18	#include <linux/usb/otg.h>
	19	#include <linux/stmp_device.h>
	20	#include <linux/delay.h>
	21	#include <linux/err.h>
	22	#include <linux/io.h>
	23
	24	#define DRIVER_NAME "mxs_phy"
	25
	26	#define HW_USBPHY_PWD 0x00
	27	#define HW_USBPHY_CTRL 0x30
	28	#define HW_USBPHY_CTRL_SET 0x34
	29	#define HW_USBPHY_CTRL_CLR 0x38
	30
	31	#define BM_USBPHY_CTRL_SFTRST BIT(31)
	32	#define BM_USBPHY_CTRL_CLKGATE BIT(30)
	33	#define BM_USBPHY_CTRL_ENUTMILEVEL3 BIT(15)
	34	#define BM_USBPHY_CTRL_ENUTMILEVEL2 BIT(14)
	35	#define BM_USBPHY_CTRL_ENHOSTDISCONDETECT BIT(1)
	36
	37	struct mxs_phy {
	38	struct usb_phy phy;
	39	struct clk *clk;
	40	};
	41
	42	#define to_mxs_phy(p) container_of((p), struct mxs_phy, phy)
	43
	44	static void mxs_phy_hw_init(struct mxs_phy *mxs_phy)
	45	{
	46	void __iomem *base = mxs_phy->phy.io_priv;
	47
	48	stmp_reset_block(base + HW_USBPHY_CTRL);
	49
	50	/* Power up the PHY */
	51	writel_relaxed(0, base + HW_USBPHY_PWD);
	52
	53	/* enable FS/LS device */
	54	writel_relaxed(BM_USBPHY_CTRL_ENUTMILEVEL2 \|
	55	BM_USBPHY_CTRL_ENUTMILEVEL3,
	56	base + HW_USBPHY_CTRL_SET);
	57	}
	58
	59	static int mxs_phy_init(struct usb_phy *phy)
	60	{
	61	struct mxs_phy *mxs_phy = to_mxs_phy(phy);
	62
	63	clk_prepare_enable(mxs_phy->clk);
	64	mxs_phy_hw_init(mxs_phy);
65
66	return 0;
67	}
68
69	static void mxs_phy_shutdown(struct usb_phy *phy)
70	{
71	struct mxs_phy *mxs_phy = to_mxs_phy(phy);
72
73	writel_relaxed(BM_USBPHY_CTRL_CLKGATE,
74	phy->io_priv + HW_USBPHY_CTRL_SET);
75
76	clk_disable_unprepare(mxs_phy->clk);
77	}
78
ac96511b PC	79	static int mxs_phy_on_connect(struct usb_phy *phy,
ac96511b PC	80	enum usb_device_speed speed)
b3d99681	81	{
ac96511b PC	82	dev_dbg(phy->dev, "%s speed device has connected\n",
ac96511b PC	83	(speed == USB_SPEED_HIGH) ? "high" : "non-high");
b3d99681	84
ac96511b PC	85	if (speed == USB_SPEED_HIGH)
	86	writel_relaxed(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
	87	phy->io_priv + HW_USBPHY_CTRL_SET);
b3d99681 RZ	88
	89	return 0;
	90	}
	91
ac96511b PC	92	static int mxs_phy_on_disconnect(struct usb_phy *phy,
ac96511b PC	93	enum usb_device_speed speed)
b3d99681	94	{
ac96511b PC	95	dev_dbg(phy->dev, "%s speed device has disconnected\n",
ac96511b PC	96	(speed == USB_SPEED_HIGH) ? "high" : "non-high");
b3d99681	97
ac96511b PC	98	if (speed == USB_SPEED_HIGH)
	99	writel_relaxed(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
	100	phy->io_priv + HW_USBPHY_CTRL_CLR);
b3d99681 RZ	101
	102	return 0;
	103	}
	104
	105	static int mxs_phy_probe(struct platform_device *pdev)
	106	{
	107	struct resource *res;
	108	void __iomem *base;
	109	struct clk *clk;
	110	struct mxs_phy *mxs_phy;
	111
	112	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	113	if (!res) {
	114	dev_err(&pdev->dev, "can't get device resources\n");
	115	return -ENOENT;
	116	}
	117
	118	base = devm_request_and_ioremap(&pdev->dev, res);
	119	if (!base)
	120	return -EBUSY;
	121
	122	clk = devm_clk_get(&pdev->dev, NULL);
	123	if (IS_ERR(clk)) {
	124	dev_err(&pdev->dev,
	125	"can't get the clock, err=%ld", PTR_ERR(clk));
	126	return PTR_ERR(clk);
	127	}
	128
	129	mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL);
	130	if (!mxs_phy) {
	131	dev_err(&pdev->dev, "Failed to allocate USB PHY structure!\n");
	132	return -ENOMEM;
	133	}
	134
	135	mxs_phy->phy.io_priv = base;
	136	mxs_phy->phy.dev = &pdev->dev;
	137	mxs_phy->phy.label = DRIVER_NAME;
	138	mxs_phy->phy.init = mxs_phy_init;
	139	mxs_phy->phy.shutdown = mxs_phy_shutdown;
	140	mxs_phy->phy.notify_connect = mxs_phy_on_connect;
	141	mxs_phy->phy.notify_disconnect = mxs_phy_on_disconnect;
	142
	143	ATOMIC_INIT_NOTIFIER_HEAD(&mxs_phy->phy.notifier);
	144
	145	mxs_phy->clk = clk;
	146
	147	platform_set_drvdata(pdev, &mxs_phy->phy);
	148
	149	return 0;
	150	}
	151
fb4e98ab	152	static int mxs_phy_remove(struct platform_device *pdev)
b3d99681 RZ	153	{
	154	platform_set_drvdata(pdev, NULL);
	155
	156	return 0;
	157	}
	158
	159	static const struct of_device_id mxs_phy_dt_ids[] = {
	160	{ .compatible = "fsl,imx23-usbphy", },
	161	{ /* sentinel */ }
	162	};
	163	MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);
	164
	165	static struct platform_driver mxs_phy_driver = {
	166	.probe = mxs_phy_probe,
7690417d	167	.remove = mxs_phy_remove,
b3d99681 RZ	168	.driver = {
	169	.name = DRIVER_NAME,
	170	.owner = THIS_MODULE,
	171	.of_match_table = mxs_phy_dt_ids,
	172	},
	173	};
	174
	175	static int __init mxs_phy_module_init(void)
	176	{
	177	return platform_driver_register(&mxs_phy_driver);
	178	}
	179	postcore_initcall(mxs_phy_module_init);
	180
	181	static void __exit mxs_phy_module_exit(void)
	182	{
	183	platform_driver_unregister(&mxs_phy_driver);
	184	}
	185	module_exit(mxs_phy_module_exit);
	186
	187	MODULE_ALIAS("platform:mxs-usb-phy");
	188	MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
	189	MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
	190	MODULE_DESCRIPTION("Freescale MXS USB PHY driver");
	191	MODULE_LICENSE("GPL");