[deliverable/linux.git] / drivers / phy / phy-samsung-usb2.c

/*
 * Samsung SoC USB 1.1/2.0 PHY driver
 *
 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
 * Author: Kamil Debski <k.debski@samsung.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/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include "phy-samsung-usb2.h"

static int samsung_usb2_phy_power_on(struct phy *phy)
{
	struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
	struct samsung_usb2_phy_driver *drv = inst->drv;
	int ret;

	dev_dbg(drv->dev, "Request to power_on \"%s\" usb phy\n",
		inst->cfg->label);
	ret = clk_prepare_enable(drv->clk);
	if (ret)
		goto err_main_clk;
	ret = clk_prepare_enable(drv->ref_clk);
	if (ret)
		goto err_instance_clk;
	if (inst->cfg->power_on) {
		spin_lock(&drv->lock);
		ret = inst->cfg->power_on(inst);
		spin_unlock(&drv->lock);
	}

	return 0;

err_instance_clk:
	clk_disable_unprepare(drv->clk);
err_main_clk:
	return ret;
}

static int samsung_usb2_phy_power_off(struct phy *phy)
{
	struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
	struct samsung_usb2_phy_driver *drv = inst->drv;
	int ret = 0;

	dev_dbg(drv->dev, "Request to power_off \"%s\" usb phy\n",
		inst->cfg->label);
	if (inst->cfg->power_off) {
		spin_lock(&drv->lock);
		ret = inst->cfg->power_off(inst);
		spin_unlock(&drv->lock);
	}
	clk_disable_unprepare(drv->ref_clk);
	clk_disable_unprepare(drv->clk);
	return ret;
}

static struct phy_ops samsung_usb2_phy_ops = {
	.power_on	= samsung_usb2_phy_power_on,
	.power_off	= samsung_usb2_phy_power_off,
	.owner		= THIS_MODULE,
};

static struct phy *samsung_usb2_phy_xlate(struct device *dev,
					struct of_phandle_args *args)
{
	struct samsung_usb2_phy_driver *drv;

	drv = dev_get_drvdata(dev);
	if (!drv)
		return ERR_PTR(-EINVAL);

	if (WARN_ON(args->args[0] >= drv->cfg->num_phys))
		return ERR_PTR(-ENODEV);

	return drv->instances[args->args[0]].phy;
}

static const struct of_device_id samsung_usb2_phy_of_match[] = {
#ifdef CONFIG_PHY_S5PV210_USB2
	{
		.compatible = "samsung,s5pv210-usb2-phy",
		.data = &s5pv210_usb2_phy_config,
	},
#endif
#ifdef CONFIG_PHY_EXYNOS4210_USB2
	{
		.compatible = "samsung,exynos4210-usb2-phy",
		.data = &exynos4210_usb2_phy_config,
	},
#endif
#ifdef CONFIG_PHY_EXYNOS4X12_USB2
	{
		.compatible = "samsung,exynos4x12-usb2-phy",
		.data = &exynos4x12_usb2_phy_config,
	},
#endif
#ifdef CONFIG_PHY_EXYNOS5250_USB2
	{
		.compatible = "samsung,exynos5250-usb2-phy",
		.data = &exynos5250_usb2_phy_config,
	},
#endif
	{ },
};
MODULE_DEVICE_TABLE(of, samsung_usb2_phy_of_match);

static int samsung_usb2_phy_probe(struct platform_device *pdev)
{
	const struct of_device_id *match;
	const struct samsung_usb2_phy_config *cfg;
	struct device *dev = &pdev->dev;
	struct phy_provider *phy_provider;
	struct resource *mem;
	struct samsung_usb2_phy_driver *drv;
	int i, ret;

	if (!pdev->dev.of_node) {
		dev_err(dev, "This driver is required to be instantiated from device tree\n");
		return -EINVAL;
	}

	match = of_match_node(samsung_usb2_phy_of_match, pdev->dev.of_node);
	if (!match) {
		dev_err(dev, "of_match_node() failed\n");
		return -EINVAL;
	}
	cfg = match->data;

	drv = devm_kzalloc(dev, sizeof(struct samsung_usb2_phy_driver) +
		cfg->num_phys * sizeof(struct samsung_usb2_phy_instance),
								GFP_KERNEL);
	if (!drv)
		return -ENOMEM;

	dev_set_drvdata(dev, drv);
	spin_lock_init(&drv->lock);

	drv->cfg = cfg;
	drv->dev = dev;

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	drv->reg_phy = devm_ioremap_resource(dev, mem);
	if (IS_ERR(drv->reg_phy)) {
		dev_err(dev, "Failed to map register memory (phy)\n");
		return PTR_ERR(drv->reg_phy);
	}

	drv->reg_pmu = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
		"samsung,pmureg-phandle");
	if (IS_ERR(drv->reg_pmu)) {
		dev_err(dev, "Failed to map PMU registers (via syscon)\n");
		return PTR_ERR(drv->reg_pmu);
	}

	if (drv->cfg->has_mode_switch) {
		drv->reg_sys = syscon_regmap_lookup_by_phandle(
				pdev->dev.of_node, "samsung,sysreg-phandle");
		if (IS_ERR(drv->reg_sys)) {
			dev_err(dev, "Failed to map system registers (via syscon)\n");
			return PTR_ERR(drv->reg_sys);
		}
	}

	drv->clk = devm_clk_get(dev, "phy");
	if (IS_ERR(drv->clk)) {
		dev_err(dev, "Failed to get clock of phy controller\n");
		return PTR_ERR(drv->clk);
	}

	drv->ref_clk = devm_clk_get(dev, "ref");
	if (IS_ERR(drv->ref_clk)) {
		dev_err(dev, "Failed to get reference clock for the phy controller\n");
		return PTR_ERR(drv->ref_clk);
	}

	drv->ref_rate = clk_get_rate(drv->ref_clk);
	if (drv->cfg->rate_to_clk) {
		ret = drv->cfg->rate_to_clk(drv->ref_rate, &drv->ref_reg_val);
		if (ret)
			return ret;
	}

	for (i = 0; i < drv->cfg->num_phys; i++) {
		char *label = drv->cfg->phys[i].label;
		struct samsung_usb2_phy_instance *p = &drv->instances[i];

		dev_dbg(dev, "Creating phy \"%s\"\n", label);
		p->phy = devm_phy_create(dev, &samsung_usb2_phy_ops, NULL);
		if (IS_ERR(p->phy)) {
			dev_err(drv->dev, "Failed to create usb2_phy \"%s\"\n",
				label);
			return PTR_ERR(p->phy);
		}

		p->cfg = &drv->cfg->phys[i];
		p->drv = drv;
		phy_set_bus_width(p->phy, 8);
		phy_set_drvdata(p->phy, p);
	}

	phy_provider = devm_of_phy_provider_register(dev,
							samsung_usb2_phy_xlate);
	if (IS_ERR(phy_provider)) {
		dev_err(drv->dev, "Failed to register phy provider\n");
		return PTR_ERR(phy_provider);
	}

	return 0;
}

static struct platform_driver samsung_usb2_phy_driver = {
	.probe	= samsung_usb2_phy_probe,
	.driver = {
		.of_match_table	= samsung_usb2_phy_of_match,
		.name		= "samsung-usb2-phy",
		.owner		= THIS_MODULE,
	}
};

module_platform_driver(samsung_usb2_phy_driver);
MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC USB PHY driver");
MODULE_AUTHOR("Kamil Debski <k.debski@samsung.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:samsung-usb2-phy");
Commit	Line	Data
06fb0137 KD	1	/*
	2	* Samsung SoC USB 1.1/2.0 PHY driver
	3	*
	4	* Copyright (C) 2013 Samsung Electronics Co., Ltd.
	5	* Author: Kamil Debski <k.debski@samsung.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
	12	#include <linux/clk.h>
	13	#include <linux/mfd/syscon.h>
	14	#include <linux/module.h>
	15	#include <linux/of.h>
	16	#include <linux/of_address.h>
	17	#include <linux/phy/phy.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/spinlock.h>
	20	#include "phy-samsung-usb2.h"
	21
	22	static int samsung_usb2_phy_power_on(struct phy *phy)
	23	{
	24	struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
	25	struct samsung_usb2_phy_driver *drv = inst->drv;
	26	int ret;
	27
	28	dev_dbg(drv->dev, "Request to power_on \"%s\" usb phy\n",
	29	inst->cfg->label);
	30	ret = clk_prepare_enable(drv->clk);
	31	if (ret)
	32	goto err_main_clk;
	33	ret = clk_prepare_enable(drv->ref_clk);
	34	if (ret)
	35	goto err_instance_clk;
	36	if (inst->cfg->power_on) {
	37	spin_lock(&drv->lock);
	38	ret = inst->cfg->power_on(inst);
	39	spin_unlock(&drv->lock);
	40	}
	41
	42	return 0;
	43
	44	err_instance_clk:
	45	clk_disable_unprepare(drv->clk);
	46	err_main_clk:
	47	return ret;
	48	}
	49
	50	static int samsung_usb2_phy_power_off(struct phy *phy)
	51	{
	52	struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
	53	struct samsung_usb2_phy_driver *drv = inst->drv;
	54	int ret = 0;
	55
	56	dev_dbg(drv->dev, "Request to power_off \"%s\" usb phy\n",
	57	inst->cfg->label);
	58	if (inst->cfg->power_off) {
	59	spin_lock(&drv->lock);
	60	ret = inst->cfg->power_off(inst);
	61	spin_unlock(&drv->lock);
	62	}
	63	clk_disable_unprepare(drv->ref_clk);
	64	clk_disable_unprepare(drv->clk);
65	return ret;
66	}
67
68	static struct phy_ops samsung_usb2_phy_ops = {
69	.power_on = samsung_usb2_phy_power_on,
70	.power_off = samsung_usb2_phy_power_off,
71	.owner = THIS_MODULE,
72	};
73
74	static struct phy samsung_usb2_phy_xlate(struct device dev,
75	struct of_phandle_args *args)
76	{
77	struct samsung_usb2_phy_driver *drv;
78
79	drv = dev_get_drvdata(dev);
80	if (!drv)
81	return ERR_PTR(-EINVAL);
82
83	if (WARN_ON(args->args[0] >= drv->cfg->num_phys))
84	return ERR_PTR(-ENODEV);
85
86	return drv->instances[args->args[0]].phy;
87	}
88
89	static const struct of_device_id samsung_usb2_phy_of_match[] = {
949ccc3a MK	90	#ifdef CONFIG_PHY_S5PV210_USB2
	91	{
	92	.compatible = "samsung,s5pv210-usb2-phy",
	93	.data = &s5pv210_usb2_phy_config,
	94	},
	95	#endif
06fb0137 KD	96	#ifdef CONFIG_PHY_EXYNOS4210_USB2
	97	{
	98	.compatible = "samsung,exynos4210-usb2-phy",
	99	.data = &exynos4210_usb2_phy_config,
	100	},
	101	#endif
	102	#ifdef CONFIG_PHY_EXYNOS4X12_USB2
	103	{
	104	.compatible = "samsung,exynos4x12-usb2-phy",
	105	.data = &exynos4x12_usb2_phy_config,
	106	},
64bf2b23 KD	107	#endif
	108	#ifdef CONFIG_PHY_EXYNOS5250_USB2
	109	{
	110	.compatible = "samsung,exynos5250-usb2-phy",
	111	.data = &exynos5250_usb2_phy_config,
	112	},
06fb0137 KD	113	#endif
	114	{ },
	115	};
bf5baf95	116	MODULE_DEVICE_TABLE(of, samsung_usb2_phy_of_match);
06fb0137 KD	117
	118	static int samsung_usb2_phy_probe(struct platform_device *pdev)
	119	{
	120	const struct of_device_id *match;
	121	const struct samsung_usb2_phy_config *cfg;
	122	struct device *dev = &pdev->dev;
	123	struct phy_provider *phy_provider;
	124	struct resource *mem;
	125	struct samsung_usb2_phy_driver *drv;
	126	int i, ret;
	127
	128	if (!pdev->dev.of_node) {
	129	dev_err(dev, "This driver is required to be instantiated from device tree\n");
	130	return -EINVAL;
	131	}
	132
	133	match = of_match_node(samsung_usb2_phy_of_match, pdev->dev.of_node);
	134	if (!match) {
	135	dev_err(dev, "of_match_node() failed\n");
	136	return -EINVAL;
	137	}
	138	cfg = match->data;
	139
	140	drv = devm_kzalloc(dev, sizeof(struct samsung_usb2_phy_driver) +
	141	cfg->num_phys * sizeof(struct samsung_usb2_phy_instance),
	142	GFP_KERNEL);
	143	if (!drv)
	144	return -ENOMEM;
	145
	146	dev_set_drvdata(dev, drv);
	147	spin_lock_init(&drv->lock);
	148
	149	drv->cfg = cfg;
	150	drv->dev = dev;
	151
	152	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	153	drv->reg_phy = devm_ioremap_resource(dev, mem);
	154	if (IS_ERR(drv->reg_phy)) {
	155	dev_err(dev, "Failed to map register memory (phy)\n");
	156	return PTR_ERR(drv->reg_phy);
	157	}
	158
	159	drv->reg_pmu = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
	160	"samsung,pmureg-phandle");
	161	if (IS_ERR(drv->reg_pmu)) {
	162	dev_err(dev, "Failed to map PMU registers (via syscon)\n");
	163	return PTR_ERR(drv->reg_pmu);
	164	}
	165
	166	if (drv->cfg->has_mode_switch) {
	167	drv->reg_sys = syscon_regmap_lookup_by_phandle(
	168	pdev->dev.of_node, "samsung,sysreg-phandle");
	169	if (IS_ERR(drv->reg_sys)) {
	170	dev_err(dev, "Failed to map system registers (via syscon)\n");
	171	return PTR_ERR(drv->reg_sys);
	172	}
	173	}
	174
	175	drv->clk = devm_clk_get(dev, "phy");
	176	if (IS_ERR(drv->clk)) {
	177	dev_err(dev, "Failed to get clock of phy controller\n");
	178	return PTR_ERR(drv->clk);
	179	}
	180
181	drv->ref_clk = devm_clk_get(dev, "ref");
182	if (IS_ERR(drv->ref_clk)) {
183	dev_err(dev, "Failed to get reference clock for the phy controller\n");
184	return PTR_ERR(drv->ref_clk);
185	}
186
187	drv->ref_rate = clk_get_rate(drv->ref_clk);
188	if (drv->cfg->rate_to_clk) {
189	ret = drv->cfg->rate_to_clk(drv->ref_rate, &drv->ref_reg_val);
190	if (ret)
191	return ret;
192	}
193
194	for (i = 0; i < drv->cfg->num_phys; i++) {
195	char *label = drv->cfg->phys[i].label;
196	struct samsung_usb2_phy_instance *p = &drv->instances[i];
197
198	dev_dbg(dev, "Creating phy \"%s\"\n", label);
199	p->phy = devm_phy_create(dev, &samsung_usb2_phy_ops, NULL);
200	if (IS_ERR(p->phy)) {
201	dev_err(drv->dev, "Failed to create usb2_phy \"%s\"\n",
202	label);
203	return PTR_ERR(p->phy);
204	}
205
206	p->cfg = &drv->cfg->phys[i];
207	p->drv = drv;
208	phy_set_bus_width(p->phy, 8);
209	phy_set_drvdata(p->phy, p);
210	}
211
212	phy_provider = devm_of_phy_provider_register(dev,
213	samsung_usb2_phy_xlate);
214	if (IS_ERR(phy_provider)) {
215	dev_err(drv->dev, "Failed to register phy provider\n");
216	return PTR_ERR(phy_provider);
217	}
218
219	return 0;
220	}
221
222	static struct platform_driver samsung_usb2_phy_driver = {
223	.probe = samsung_usb2_phy_probe,
224	.driver = {
225	.of_match_table = samsung_usb2_phy_of_match,
226	.name = "samsung-usb2-phy",
227	.owner = THIS_MODULE,
228	}
229	};
230
231	module_platform_driver(samsung_usb2_phy_driver);
232	MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC USB PHY driver");
233	MODULE_AUTHOR("Kamil Debski <k.debski@samsung.com>");
234	MODULE_LICENSE("GPL v2");
235	MODULE_ALIAS("platform:samsung-usb2-phy");