[deliverable/linux.git] / drivers / usb / phy / 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(0, base + HW_USBPHY_PWD);

	/* enable FS/LS device */
	writel(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(BM_USBPHY_CTRL_CLKGATE,
	       phy->io_priv + HW_USBPHY_CTRL_SET);

	clk_disable_unprepare(mxs_phy->clk);
}

static int mxs_phy_suspend(struct usb_phy *x, int suspend)
{
	struct mxs_phy *mxs_phy = to_mxs_phy(x);

	if (suspend) {
		writel(0xffffffff, x->io_priv + HW_USBPHY_PWD);
		writel(BM_USBPHY_CTRL_CLKGATE,
		       x->io_priv + HW_USBPHY_CTRL_SET);
		clk_disable_unprepare(mxs_phy->clk);
	} else {
		clk_prepare_enable(mxs_phy->clk);
		writel(BM_USBPHY_CTRL_CLKGATE,
		       x->io_priv + HW_USBPHY_CTRL_CLR);
		writel(0, x->io_priv + HW_USBPHY_PWD);
	}

	return 0;
}

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(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(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;
	int ret;

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

	base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(base))
		return PTR_ERR(base);

	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.set_suspend	= mxs_phy_suspend;
	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);

	ret = usb_add_phy_dev(&mxs_phy->phy);
	if (ret)
		return ret;

	return 0;
}

static int mxs_phy_remove(struct platform_device *pdev)
{
	struct mxs_phy *mxs_phy = platform_get_drvdata(pdev);

	usb_remove_phy(&mxs_phy->phy);

	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 */
b5a726b3	51	writel(0, base + HW_USBPHY_PWD);
b3d99681 RZ	52
b3d99681 RZ	53	/* enable FS/LS device */
b5a726b3 MKB	54	writel(BM_USBPHY_CTRL_ENUTMILEVEL2 \|
	55	BM_USBPHY_CTRL_ENUTMILEVEL3,
	56	base + HW_USBPHY_CTRL_SET);
b3d99681 RZ	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
b5a726b3 MKB	73	writel(BM_USBPHY_CTRL_CLKGATE,
b5a726b3 MKB	74	phy->io_priv + HW_USBPHY_CTRL_SET);
b3d99681 RZ	75
	76	clk_disable_unprepare(mxs_phy->clk);
	77	}
	78
04a6221c PC	79	static int mxs_phy_suspend(struct usb_phy *x, int suspend)
	80	{
	81	struct mxs_phy *mxs_phy = to_mxs_phy(x);
	82
	83	if (suspend) {
b5a726b3 MKB	84	writel(0xffffffff, x->io_priv + HW_USBPHY_PWD);
	85	writel(BM_USBPHY_CTRL_CLKGATE,
	86	x->io_priv + HW_USBPHY_CTRL_SET);
04a6221c PC	87	clk_disable_unprepare(mxs_phy->clk);
	88	} else {
	89	clk_prepare_enable(mxs_phy->clk);
b5a726b3 MKB	90	writel(BM_USBPHY_CTRL_CLKGATE,
	91	x->io_priv + HW_USBPHY_CTRL_CLR);
	92	writel(0, x->io_priv + HW_USBPHY_PWD);
04a6221c PC	93	}
	94
	95	return 0;
	96	}
	97
ac96511b PC	98	static int mxs_phy_on_connect(struct usb_phy *phy,
ac96511b PC	99	enum usb_device_speed speed)
b3d99681	100	{
ac96511b PC	101	dev_dbg(phy->dev, "%s speed device has connected\n",
ac96511b PC	102	(speed == USB_SPEED_HIGH) ? "high" : "non-high");
b3d99681	103
ac96511b	104	if (speed == USB_SPEED_HIGH)
b5a726b3 MKB	105	writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
b5a726b3 MKB	106	phy->io_priv + HW_USBPHY_CTRL_SET);
b3d99681 RZ	107
	108	return 0;
	109	}
	110
ac96511b PC	111	static int mxs_phy_on_disconnect(struct usb_phy *phy,
ac96511b PC	112	enum usb_device_speed speed)
b3d99681	113	{
ac96511b PC	114	dev_dbg(phy->dev, "%s speed device has disconnected\n",
ac96511b PC	115	(speed == USB_SPEED_HIGH) ? "high" : "non-high");
b3d99681	116
ac96511b	117	if (speed == USB_SPEED_HIGH)
b5a726b3 MKB	118	writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
b5a726b3 MKB	119	phy->io_priv + HW_USBPHY_CTRL_CLR);
b3d99681 RZ	120
	121	return 0;
	122	}
	123
	124	static int mxs_phy_probe(struct platform_device *pdev)
	125	{
	126	struct resource *res;
	127	void __iomem *base;
	128	struct clk *clk;
	129	struct mxs_phy *mxs_phy;
25df6397	130	int ret;
b3d99681 RZ	131
	132	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	133	if (!res) {
	134	dev_err(&pdev->dev, "can't get device resources\n");
	135	return -ENOENT;
	136	}
	137
148e1134 TR	138	base = devm_ioremap_resource(&pdev->dev, res);
	139	if (IS_ERR(base))
	140	return PTR_ERR(base);
b3d99681 RZ	141
	142	clk = devm_clk_get(&pdev->dev, NULL);
	143	if (IS_ERR(clk)) {
	144	dev_err(&pdev->dev,
	145	"can't get the clock, err=%ld", PTR_ERR(clk));
	146	return PTR_ERR(clk);
	147	}
	148
	149	mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL);
	150	if (!mxs_phy) {
	151	dev_err(&pdev->dev, "Failed to allocate USB PHY structure!\n");
	152	return -ENOMEM;
	153	}
	154
	155	mxs_phy->phy.io_priv = base;
	156	mxs_phy->phy.dev = &pdev->dev;
	157	mxs_phy->phy.label = DRIVER_NAME;
	158	mxs_phy->phy.init = mxs_phy_init;
	159	mxs_phy->phy.shutdown = mxs_phy_shutdown;
04a6221c	160	mxs_phy->phy.set_suspend = mxs_phy_suspend;
b3d99681 RZ	161	mxs_phy->phy.notify_connect = mxs_phy_on_connect;
	162	mxs_phy->phy.notify_disconnect = mxs_phy_on_disconnect;
	163
	164	ATOMIC_INIT_NOTIFIER_HEAD(&mxs_phy->phy.notifier);
	165
	166	mxs_phy->clk = clk;
	167
	168	platform_set_drvdata(pdev, &mxs_phy->phy);
	169
25df6397 SH	170	ret = usb_add_phy_dev(&mxs_phy->phy);
	171	if (ret)
	172	return ret;
	173
b3d99681 RZ	174	return 0;
	175	}
	176
fb4e98ab	177	static int mxs_phy_remove(struct platform_device *pdev)
b3d99681	178	{
25df6397 SH	179	struct mxs_phy *mxs_phy = platform_get_drvdata(pdev);
	180
	181	usb_remove_phy(&mxs_phy->phy);
	182
b3d99681 RZ	183	platform_set_drvdata(pdev, NULL);
	184
	185	return 0;
	186	}
	187
	188	static const struct of_device_id mxs_phy_dt_ids[] = {
	189	{ .compatible = "fsl,imx23-usbphy", },
	190	{ /* sentinel */ }
	191	};
	192	MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);
	193
	194	static struct platform_driver mxs_phy_driver = {
	195	.probe = mxs_phy_probe,
7690417d	196	.remove = mxs_phy_remove,
b3d99681 RZ	197	.driver = {
	198	.name = DRIVER_NAME,
	199	.owner = THIS_MODULE,
	200	.of_match_table = mxs_phy_dt_ids,
	201	},
	202	};
	203
	204	static int __init mxs_phy_module_init(void)
	205	{
	206	return platform_driver_register(&mxs_phy_driver);
	207	}
	208	postcore_initcall(mxs_phy_module_init);
	209
	210	static void __exit mxs_phy_module_exit(void)
	211	{
	212	platform_driver_unregister(&mxs_phy_driver);
	213	}
	214	module_exit(mxs_phy_module_exit);
	215
	216	MODULE_ALIAS("platform:mxs-usb-phy");
	217	MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
	218	MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
	219	MODULE_DESCRIPTION("Freescale MXS USB PHY driver");
	220	MODULE_LICENSE("GPL");