[linux-2.6-block.git] / drivers / phy / phy-lpc18xx-usb-otg.c

/*
 * PHY driver for NXP LPC18xx/43xx internal USB OTG PHY
 *
 * Copyright (C) 2015 Joachim Eastwood <manabian@gmail.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 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/clk.h>
#include <linux/err.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

/* USB OTG PHY register offset and bit in CREG */
#define LPC18XX_CREG_CREG0		0x004
#define LPC18XX_CREG_CREG0_USB0PHY	BIT(5)

struct lpc18xx_usb_otg_phy {
	struct phy *phy;
	struct clk *clk;
	struct regmap *reg;
};

static int lpc18xx_usb_otg_phy_init(struct phy *phy)
{
	struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);
	int ret;

	/* The PHY must be clocked at 480 MHz */
	ret = clk_set_rate(lpc->clk, 480000000);
	if (ret)
		return ret;

	return clk_prepare(lpc->clk);
}

static int lpc18xx_usb_otg_phy_exit(struct phy *phy)
{
	struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);

	clk_unprepare(lpc->clk);

	return 0;
}

static int lpc18xx_usb_otg_phy_power_on(struct phy *phy)
{
	struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);
	int ret;

	ret = clk_enable(lpc->clk);
	if (ret)
		return ret;

	/* The bit in CREG is cleared to enable the PHY */
	ret = regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0,
				  LPC18XX_CREG_CREG0_USB0PHY, 0);
	if (ret) {
		clk_disable(lpc->clk);
		return ret;
	}

	return 0;
}

static int lpc18xx_usb_otg_phy_power_off(struct phy *phy)
{
	struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);
	int ret;

	ret = regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0,
				 LPC18XX_CREG_CREG0_USB0PHY,
				 LPC18XX_CREG_CREG0_USB0PHY);
	if (ret)
		return ret;

	clk_disable(lpc->clk);

	return 0;
}

static const struct phy_ops lpc18xx_usb_otg_phy_ops = {
	.init		= lpc18xx_usb_otg_phy_init,
	.exit		= lpc18xx_usb_otg_phy_exit,
	.power_on	= lpc18xx_usb_otg_phy_power_on,
	.power_off	= lpc18xx_usb_otg_phy_power_off,
	.owner		= THIS_MODULE,
};

static int lpc18xx_usb_otg_phy_probe(struct platform_device *pdev)
{
	struct phy_provider *phy_provider;
	struct lpc18xx_usb_otg_phy *lpc;

	lpc = devm_kzalloc(&pdev->dev, sizeof(*lpc), GFP_KERNEL);
	if (!lpc)
		return -ENOMEM;

	lpc->reg = syscon_node_to_regmap(pdev->dev.of_node->parent);
	if (IS_ERR(lpc->reg)) {
		dev_err(&pdev->dev, "failed to get syscon\n");
		return PTR_ERR(lpc->reg);
	}

	lpc->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(lpc->clk)) {
		dev_err(&pdev->dev, "failed to get clock\n");
		return PTR_ERR(lpc->clk);
	}

	lpc->phy = devm_phy_create(&pdev->dev, NULL, &lpc18xx_usb_otg_phy_ops);
	if (IS_ERR(lpc->phy)) {
		dev_err(&pdev->dev, "failed to create PHY\n");
		return PTR_ERR(lpc->phy);
	}

	phy_set_drvdata(lpc->phy, lpc);

	phy_provider = devm_of_phy_provider_register(&pdev->dev,
						     of_phy_simple_xlate);

	return PTR_ERR_OR_ZERO(phy_provider);
}

static const struct of_device_id lpc18xx_usb_otg_phy_match[] = {
	{ .compatible = "nxp,lpc1850-usb-otg-phy" },
	{ }
};
MODULE_DEVICE_TABLE(of, lpc18xx_usb_otg_phy_match);

static struct platform_driver lpc18xx_usb_otg_phy_driver = {
	.probe		= lpc18xx_usb_otg_phy_probe,
	.driver		= {
		.name	= "lpc18xx-usb-otg-phy",
		.of_match_table = lpc18xx_usb_otg_phy_match,
	},
};
module_platform_driver(lpc18xx_usb_otg_phy_driver);

MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
MODULE_DESCRIPTION("NXP LPC18xx/43xx USB OTG PHY driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
cbf919bd JE	1	/*
	2	* PHY driver for NXP LPC18xx/43xx internal USB OTG PHY
	3	*
	4	* Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	*/
	11
	12	#include <linux/clk.h>
	13	#include <linux/err.h>
	14	#include <linux/mfd/syscon.h>
	15	#include <linux/module.h>
	16	#include <linux/of.h>
	17	#include <linux/phy/phy.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/regmap.h>
	20
	21	/* USB OTG PHY register offset and bit in CREG */
	22	#define LPC18XX_CREG_CREG0 0x004
	23	#define LPC18XX_CREG_CREG0_USB0PHY BIT(5)
	24
	25	struct lpc18xx_usb_otg_phy {
	26	struct phy *phy;
	27	struct clk *clk;
	28	struct regmap *reg;
	29	};
	30
	31	static int lpc18xx_usb_otg_phy_init(struct phy *phy)
	32	{
	33	struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);
	34	int ret;
	35
cfd093bb JE	36	/* The PHY must be clocked at 480 MHz */
cfd093bb JE	37	ret = clk_set_rate(lpc->clk, 480000000);
cbf919bd JE	38	if (ret)
	39	return ret;
	40
cfd093bb	41	return clk_prepare(lpc->clk);
cbf919bd JE	42	}
	43
	44	static int lpc18xx_usb_otg_phy_exit(struct phy *phy)
	45	{
	46	struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);
	47
	48	clk_unprepare(lpc->clk);
	49
	50	return 0;
	51	}
	52
	53	static int lpc18xx_usb_otg_phy_power_on(struct phy *phy)
	54	{
	55	struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);
	56	int ret;
	57
	58	ret = clk_enable(lpc->clk);
	59	if (ret)
	60	return ret;
	61
	62	/* The bit in CREG is cleared to enable the PHY */
124380cb	63	ret = regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0,
cbf919bd	64	LPC18XX_CREG_CREG0_USB0PHY, 0);
124380cb AK	65	if (ret) {
	66	clk_disable(lpc->clk);
	67	return ret;
	68	}
	69
	70	return 0;
cbf919bd JE	71	}
	72
	73	static int lpc18xx_usb_otg_phy_power_off(struct phy *phy)
	74	{
	75	struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);
	76	int ret;
	77
	78	ret = regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0,
	79	LPC18XX_CREG_CREG0_USB0PHY,
	80	LPC18XX_CREG_CREG0_USB0PHY);
	81	if (ret)
	82	return ret;
	83
	84	clk_disable(lpc->clk);
	85
	86	return 0;
	87	}
	88
	89	static const struct phy_ops lpc18xx_usb_otg_phy_ops = {
	90	.init = lpc18xx_usb_otg_phy_init,
	91	.exit = lpc18xx_usb_otg_phy_exit,
	92	.power_on = lpc18xx_usb_otg_phy_power_on,
	93	.power_off = lpc18xx_usb_otg_phy_power_off,
	94	.owner = THIS_MODULE,
	95	};
	96
	97	static int lpc18xx_usb_otg_phy_probe(struct platform_device *pdev)
	98	{
	99	struct phy_provider *phy_provider;
	100	struct lpc18xx_usb_otg_phy *lpc;
	101
	102	lpc = devm_kzalloc(&pdev->dev, sizeof(*lpc), GFP_KERNEL);
	103	if (!lpc)
	104	return -ENOMEM;
	105
	106	lpc->reg = syscon_node_to_regmap(pdev->dev.of_node->parent);
	107	if (IS_ERR(lpc->reg)) {
	108	dev_err(&pdev->dev, "failed to get syscon\n");
	109	return PTR_ERR(lpc->reg);
	110	}
	111
	112	lpc->clk = devm_clk_get(&pdev->dev, NULL);
	113	if (IS_ERR(lpc->clk)) {
	114	dev_err(&pdev->dev, "failed to get clock\n");
	115	return PTR_ERR(lpc->clk);
	116	}
	117
	118	lpc->phy = devm_phy_create(&pdev->dev, NULL, &lpc18xx_usb_otg_phy_ops);
	119	if (IS_ERR(lpc->phy)) {
	120	dev_err(&pdev->dev, "failed to create PHY\n");
	121	return PTR_ERR(lpc->phy);
	122	}
	123
	124	phy_set_drvdata(lpc->phy, lpc);
	125
	126	phy_provider = devm_of_phy_provider_register(&pdev->dev,
	127	of_phy_simple_xlate);
	128
	129	return PTR_ERR_OR_ZERO(phy_provider);
	130	}
	131
	132	static const struct of_device_id lpc18xx_usb_otg_phy_match[] = {
	133	{ .compatible = "nxp,lpc1850-usb-otg-phy" },
	134	{ }
135	};
136	MODULE_DEVICE_TABLE(of, lpc18xx_usb_otg_phy_match);
137
138	static struct platform_driver lpc18xx_usb_otg_phy_driver = {
139	.probe = lpc18xx_usb_otg_phy_probe,
140	.driver = {
141	.name = "lpc18xx-usb-otg-phy",
142	.of_match_table = lpc18xx_usb_otg_phy_match,
143	},
144	};
145	module_platform_driver(lpc18xx_usb_otg_phy_driver);
146
147	MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
148	MODULE_DESCRIPTION("NXP LPC18xx/43xx USB OTG PHY driver");
149	MODULE_LICENSE("GPL v2");