[linux-2.6-block.git] / drivers / phy / phy-stih407-usb.c

/*
 * Copyright (C) 2014 STMicroelectronics
 *
 * STMicroelectronics Generic PHY driver for STiH407 USB2.
 *
 * Author: Giuseppe Cavallaro <peppe.cavallaro@st.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/platform_device.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/clk.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <linux/mfd/syscon.h>
#include <linux/phy/phy.h>

/* Default PHY_SEL and REFCLKSEL configuration */
#define STIH407_USB_PICOPHY_CTRL_PORT_CONF	0x6
#define STIH407_USB_PICOPHY_CTRL_PORT_MASK	0x1f

/* ports parameters overriding */
#define STIH407_USB_PICOPHY_PARAM_DEF		0x39a4dc
#define STIH407_USB_PICOPHY_PARAM_MASK		0xffffffff

struct stih407_usb2_picophy {
	struct phy *phy;
	struct regmap *regmap;
	struct device *dev;
	struct reset_control *rstc;
	struct reset_control *rstport;
	int ctrl;
	int param;
};

static int stih407_usb2_pico_ctrl(struct stih407_usb2_picophy *phy_dev)
{
	reset_control_deassert(phy_dev->rstc);

	return regmap_update_bits(phy_dev->regmap, phy_dev->ctrl,
				  STIH407_USB_PICOPHY_CTRL_PORT_MASK,
				  STIH407_USB_PICOPHY_CTRL_PORT_CONF);
}

static int stih407_usb2_init_port(struct phy *phy)
{
	int ret;
	struct stih407_usb2_picophy *phy_dev = phy_get_drvdata(phy);

	stih407_usb2_pico_ctrl(phy_dev);

	ret = regmap_update_bits(phy_dev->regmap,
				 phy_dev->param,
				 STIH407_USB_PICOPHY_PARAM_MASK,
				 STIH407_USB_PICOPHY_PARAM_DEF);
	if (ret)
		return ret;

	return reset_control_deassert(phy_dev->rstport);
}

static int stih407_usb2_exit_port(struct phy *phy)
{
	struct stih407_usb2_picophy *phy_dev = phy_get_drvdata(phy);

	/*
	 * Only port reset is asserted, phy global reset is kept untouched
	 * as other ports may still be active. When all ports are in reset
	 * state, assumption is made that power will be cut off on the phy, in
	 * case of suspend for instance. Theoretically, asserting individual
	 * reset (like here) or global reset should be equivalent.
	 */
	return reset_control_assert(phy_dev->rstport);
}

static const struct phy_ops stih407_usb2_picophy_data = {
	.init = stih407_usb2_init_port,
	.exit = stih407_usb2_exit_port,
	.owner = THIS_MODULE,
};

static int stih407_usb2_picophy_probe(struct platform_device *pdev)
{
	struct stih407_usb2_picophy *phy_dev;
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct phy_provider *phy_provider;
	struct phy *phy;
	struct resource *res;

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

	phy_dev->dev = dev;
	dev_set_drvdata(dev, phy_dev);

	phy_dev->rstc = devm_reset_control_get(dev, "global");
	if (IS_ERR(phy_dev->rstc)) {
		dev_err(dev, "failed to ctrl picoPHY reset\n");
		return PTR_ERR(phy_dev->rstc);
	}

	phy_dev->rstport = devm_reset_control_get(dev, "port");
	if (IS_ERR(phy_dev->rstport)) {
		dev_err(dev, "failed to ctrl picoPHY reset\n");
		return PTR_ERR(phy_dev->rstport);
	}

	/* Reset port by default: only deassert it in phy init */
	reset_control_assert(phy_dev->rstport);

	phy_dev->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
	if (IS_ERR(phy_dev->regmap)) {
		dev_err(dev, "No syscfg phandle specified\n");
		return PTR_ERR(phy_dev->regmap);
	}

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ctrl");
	if (!res) {
		dev_err(dev, "No ctrl reg found\n");
		return -ENXIO;
	}
	phy_dev->ctrl = res->start;

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "param");
	if (!res) {
		dev_err(dev, "No param reg found\n");
		return -ENXIO;
	}
	phy_dev->param = res->start;

	phy = devm_phy_create(dev, NULL, &stih407_usb2_picophy_data, NULL);
	if (IS_ERR(phy)) {
		dev_err(dev, "failed to create Display Port PHY\n");
		return PTR_ERR(phy);
	}

	phy_dev->phy = phy;
	phy_set_drvdata(phy, phy_dev);

	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
	if (IS_ERR(phy_provider))
		return PTR_ERR(phy_provider);

	dev_info(dev, "STiH407 USB Generic picoPHY driver probed!");

	return 0;
}

static const struct of_device_id stih407_usb2_picophy_of_match[] = {
	{ .compatible = "st,stih407-usb2-phy" },
	{ /*sentinel */ },
};

MODULE_DEVICE_TABLE(of, stih407_usb2_picophy_of_match);

static struct platform_driver stih407_usb2_picophy_driver = {
	.probe = stih407_usb2_picophy_probe,
	.driver = {
		   .name = "stih407-usb-genphy",
		   .of_match_table = stih407_usb2_picophy_of_match,
		   }
};

module_platform_driver(stih407_usb2_picophy_driver);

MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
MODULE_DESCRIPTION("STMicroelectronics Generic picoPHY driver for STiH407");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
89ae1f5d PG	1	/*
	2	* Copyright (C) 2014 STMicroelectronics
	3	*
	4	* STMicroelectronics Generic PHY driver for STiH407 USB2.
	5	*
	6	* Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2, as
	10	* published by the Free Software Foundation.
	11	*
	12	*/
	13	#include <linux/platform_device.h>
	14	#include <linux/io.h>
	15	#include <linux/kernel.h>
	16	#include <linux/module.h>
	17	#include <linux/of.h>
	18	#include <linux/of_platform.h>
	19	#include <linux/clk.h>
	20	#include <linux/regmap.h>
	21	#include <linux/reset.h>
	22	#include <linux/mfd/syscon.h>
	23	#include <linux/phy/phy.h>
	24
	25	/* Default PHY_SEL and REFCLKSEL configuration */
	26	#define STIH407_USB_PICOPHY_CTRL_PORT_CONF 0x6
	27	#define STIH407_USB_PICOPHY_CTRL_PORT_MASK 0x1f
	28
	29	/* ports parameters overriding */
	30	#define STIH407_USB_PICOPHY_PARAM_DEF 0x39a4dc
	31	#define STIH407_USB_PICOPHY_PARAM_MASK 0xffffffff
	32
	33	struct stih407_usb2_picophy {
	34	struct phy *phy;
	35	struct regmap *regmap;
	36	struct device *dev;
	37	struct reset_control *rstc;
	38	struct reset_control *rstport;
	39	int ctrl;
	40	int param;
	41	};
	42
	43	static int stih407_usb2_pico_ctrl(struct stih407_usb2_picophy *phy_dev)
	44	{
	45	reset_control_deassert(phy_dev->rstc);
	46
	47	return regmap_update_bits(phy_dev->regmap, phy_dev->ctrl,
	48	STIH407_USB_PICOPHY_CTRL_PORT_MASK,
	49	STIH407_USB_PICOPHY_CTRL_PORT_CONF);
	50	}
	51
	52	static int stih407_usb2_init_port(struct phy *phy)
	53	{
	54	int ret;
	55	struct stih407_usb2_picophy *phy_dev = phy_get_drvdata(phy);
	56
	57	stih407_usb2_pico_ctrl(phy_dev);
	58
	59	ret = regmap_update_bits(phy_dev->regmap,
	60	phy_dev->param,
	61	STIH407_USB_PICOPHY_PARAM_MASK,
	62	STIH407_USB_PICOPHY_PARAM_DEF);
	63	if (ret)
	64	return ret;
65
66	return reset_control_deassert(phy_dev->rstport);
67	}
68
69	static int stih407_usb2_exit_port(struct phy *phy)
70	{
71	struct stih407_usb2_picophy *phy_dev = phy_get_drvdata(phy);
72
73	/*
74	* Only port reset is asserted, phy global reset is kept untouched
75	* as other ports may still be active. When all ports are in reset
76	* state, assumption is made that power will be cut off on the phy, in
77	* case of suspend for instance. Theoretically, asserting individual
78	* reset (like here) or global reset should be equivalent.
79	*/
80	return reset_control_assert(phy_dev->rstport);
81	}
82
83	static const struct phy_ops stih407_usb2_picophy_data = {
84	.init = stih407_usb2_init_port,
85	.exit = stih407_usb2_exit_port,
86	.owner = THIS_MODULE,
87	};
88
89	static int stih407_usb2_picophy_probe(struct platform_device *pdev)
90	{
91	struct stih407_usb2_picophy *phy_dev;
92	struct device *dev = &pdev->dev;
93	struct device_node *np = dev->of_node;
94	struct phy_provider *phy_provider;
95	struct phy *phy;
96	struct resource *res;
97
98	phy_dev = devm_kzalloc(dev, sizeof(*phy_dev), GFP_KERNEL);
99	if (!phy_dev)
100	return -ENOMEM;
101
102	phy_dev->dev = dev;
103	dev_set_drvdata(dev, phy_dev);
104
105	phy_dev->rstc = devm_reset_control_get(dev, "global");
106	if (IS_ERR(phy_dev->rstc)) {
107	dev_err(dev, "failed to ctrl picoPHY reset\n");
108	return PTR_ERR(phy_dev->rstc);
109	}
110
111	phy_dev->rstport = devm_reset_control_get(dev, "port");
112	if (IS_ERR(phy_dev->rstport)) {
113	dev_err(dev, "failed to ctrl picoPHY reset\n");
114	return PTR_ERR(phy_dev->rstport);
115	}
116
117	/* Reset port by default: only deassert it in phy init */
118	reset_control_assert(phy_dev->rstport);
119
120	phy_dev->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
121	if (IS_ERR(phy_dev->regmap)) {
122	dev_err(dev, "No syscfg phandle specified\n");
123	return PTR_ERR(phy_dev->regmap);
124	}
125
126	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ctrl");
127	if (!res) {
128	dev_err(dev, "No ctrl reg found\n");
129	return -ENXIO;
130	}
131	phy_dev->ctrl = res->start;
132
133	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "param");
134	if (!res) {
135	dev_err(dev, "No param reg found\n");
136	return -ENXIO;
137	}
138	phy_dev->param = res->start;
139
140	phy = devm_phy_create(dev, NULL, &stih407_usb2_picophy_data, NULL);
141	if (IS_ERR(phy)) {
142	dev_err(dev, "failed to create Display Port PHY\n");
143	return PTR_ERR(phy);
144	}
145
146	phy_dev->phy = phy;
147	phy_set_drvdata(phy, phy_dev);
148
149	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
150	if (IS_ERR(phy_provider))
151	return PTR_ERR(phy_provider);
152
153	dev_info(dev, "STiH407 USB Generic picoPHY driver probed!");
154
155	return 0;
156	}
157
158	static const struct of_device_id stih407_usb2_picophy_of_match[] = {
159	{ .compatible = "st,stih407-usb2-phy" },
160	{ /sentinel / },
161	};
162
163	MODULE_DEVICE_TABLE(of, stih407_usb2_picophy_of_match);
164
165	static struct platform_driver stih407_usb2_picophy_driver = {
166	.probe = stih407_usb2_picophy_probe,
167	.driver = {
168	.name = "stih407-usb-genphy",
169	.of_match_table = stih407_usb2_picophy_of_match,
170	}
171	};
172
173	module_platform_driver(stih407_usb2_picophy_driver);
174
175	MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
176	MODULE_DESCRIPTION("STMicroelectronics Generic picoPHY driver for STiH407");
177	MODULE_LICENSE("GPL v2");