2 * Samsung SoC USB 1.1/2.0 PHY driver
4 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
5 * Author: Kamil Debski <k.debski@samsung.com>
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.
12 #include <linux/clk.h>
13 #include <linux/mfd/syscon.h>
14 #include <linux/module.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"
22 static int samsung_usb2_phy_power_on(struct phy *phy)
24 struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
25 struct samsung_usb2_phy_driver *drv = inst->drv;
28 dev_dbg(drv->dev, "Request to power_on \"%s\" usb phy\n",
30 ret = clk_prepare_enable(drv->clk);
33 ret = clk_prepare_enable(drv->ref_clk);
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);
45 clk_disable_unprepare(drv->clk);
50 static int samsung_usb2_phy_power_off(struct phy *phy)
52 struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
53 struct samsung_usb2_phy_driver *drv = inst->drv;
56 dev_dbg(drv->dev, "Request to power_off \"%s\" usb phy\n",
58 if (inst->cfg->power_off) {
59 spin_lock(&drv->lock);
60 ret = inst->cfg->power_off(inst);
61 spin_unlock(&drv->lock);
63 clk_disable_unprepare(drv->ref_clk);
64 clk_disable_unprepare(drv->clk);
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,
74 static struct phy *samsung_usb2_phy_xlate(struct device *dev,
75 struct of_phandle_args *args)
77 struct samsung_usb2_phy_driver *drv;
79 drv = dev_get_drvdata(dev);
81 return ERR_PTR(-EINVAL);
83 if (WARN_ON(args->args[0] >= drv->cfg->num_phys))
84 return ERR_PTR(-ENODEV);
86 return drv->instances[args->args[0]].phy;
89 static const struct of_device_id samsung_usb2_phy_of_match[] = {
90 #ifdef CONFIG_PHY_EXYNOS4210_USB2
92 .compatible = "samsung,exynos4210-usb2-phy",
93 .data = &exynos4210_usb2_phy_config,
96 #ifdef CONFIG_PHY_EXYNOS4X12_USB2
98 .compatible = "samsung,exynos4x12-usb2-phy",
99 .data = &exynos4x12_usb2_phy_config,
102 #ifdef CONFIG_PHY_EXYNOS5250_USB2
104 .compatible = "samsung,exynos5250-usb2-phy",
105 .data = &exynos5250_usb2_phy_config,
111 static int samsung_usb2_phy_probe(struct platform_device *pdev)
113 const struct of_device_id *match;
114 const struct samsung_usb2_phy_config *cfg;
115 struct device *dev = &pdev->dev;
116 struct phy_provider *phy_provider;
117 struct resource *mem;
118 struct samsung_usb2_phy_driver *drv;
121 if (!pdev->dev.of_node) {
122 dev_err(dev, "This driver is required to be instantiated from device tree\n");
126 match = of_match_node(samsung_usb2_phy_of_match, pdev->dev.of_node);
128 dev_err(dev, "of_match_node() failed\n");
133 drv = devm_kzalloc(dev, sizeof(struct samsung_usb2_phy_driver) +
134 cfg->num_phys * sizeof(struct samsung_usb2_phy_instance),
139 dev_set_drvdata(dev, drv);
140 spin_lock_init(&drv->lock);
145 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
146 drv->reg_phy = devm_ioremap_resource(dev, mem);
147 if (IS_ERR(drv->reg_phy)) {
148 dev_err(dev, "Failed to map register memory (phy)\n");
149 return PTR_ERR(drv->reg_phy);
152 drv->reg_pmu = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
153 "samsung,pmureg-phandle");
154 if (IS_ERR(drv->reg_pmu)) {
155 dev_err(dev, "Failed to map PMU registers (via syscon)\n");
156 return PTR_ERR(drv->reg_pmu);
159 if (drv->cfg->has_mode_switch) {
160 drv->reg_sys = syscon_regmap_lookup_by_phandle(
161 pdev->dev.of_node, "samsung,sysreg-phandle");
162 if (IS_ERR(drv->reg_sys)) {
163 dev_err(dev, "Failed to map system registers (via syscon)\n");
164 return PTR_ERR(drv->reg_sys);
168 drv->clk = devm_clk_get(dev, "phy");
169 if (IS_ERR(drv->clk)) {
170 dev_err(dev, "Failed to get clock of phy controller\n");
171 return PTR_ERR(drv->clk);
174 drv->ref_clk = devm_clk_get(dev, "ref");
175 if (IS_ERR(drv->ref_clk)) {
176 dev_err(dev, "Failed to get reference clock for the phy controller\n");
177 return PTR_ERR(drv->ref_clk);
180 drv->ref_rate = clk_get_rate(drv->ref_clk);
181 if (drv->cfg->rate_to_clk) {
182 ret = drv->cfg->rate_to_clk(drv->ref_rate, &drv->ref_reg_val);
187 for (i = 0; i < drv->cfg->num_phys; i++) {
188 char *label = drv->cfg->phys[i].label;
189 struct samsung_usb2_phy_instance *p = &drv->instances[i];
191 dev_dbg(dev, "Creating phy \"%s\"\n", label);
192 p->phy = devm_phy_create(dev, &samsung_usb2_phy_ops, NULL);
193 if (IS_ERR(p->phy)) {
194 dev_err(drv->dev, "Failed to create usb2_phy \"%s\"\n",
196 return PTR_ERR(p->phy);
199 p->cfg = &drv->cfg->phys[i];
201 phy_set_bus_width(p->phy, 8);
202 phy_set_drvdata(p->phy, p);
205 phy_provider = devm_of_phy_provider_register(dev,
206 samsung_usb2_phy_xlate);
207 if (IS_ERR(phy_provider)) {
208 dev_err(drv->dev, "Failed to register phy provider\n");
209 return PTR_ERR(phy_provider);
215 static struct platform_driver samsung_usb2_phy_driver = {
216 .probe = samsung_usb2_phy_probe,
218 .of_match_table = samsung_usb2_phy_of_match,
219 .name = "samsung-usb2-phy",
220 .owner = THIS_MODULE,
224 module_platform_driver(samsung_usb2_phy_driver);
225 MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC USB PHY driver");
226 MODULE_AUTHOR("Kamil Debski <k.debski@samsung.com>");
227 MODULE_LICENSE("GPL v2");
228 MODULE_ALIAS("platform:samsung-usb2-phy");