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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Samsung SoC USB 1.1/2.0 PHY driver4 *5 * Copyright (C) 2013 Samsung Electronics Co., Ltd.6 * Author: Kamil Debski <k.debski@samsung.com>7 */8 9#include <linux/clk.h>10#include <linux/mfd/syscon.h>11#include <linux/module.h>12#include <linux/of.h>13#include <linux/phy/phy.h>14#include <linux/platform_device.h>15#include <linux/spinlock.h>16#include "phy-samsung-usb2.h"17 18static int samsung_usb2_phy_power_on(struct phy *phy)19{20 struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);21 struct samsung_usb2_phy_driver *drv = inst->drv;22 int ret;23 24 dev_dbg(drv->dev, "Request to power_on \"%s\" usb phy\n",25 inst->cfg->label);26 27 if (drv->vbus) {28 ret = regulator_enable(drv->vbus);29 if (ret)30 goto err_regulator;31 }32 33 ret = clk_prepare_enable(drv->clk);34 if (ret)35 goto err_main_clk;36 ret = clk_prepare_enable(drv->ref_clk);37 if (ret)38 goto err_instance_clk;39 if (inst->cfg->power_on) {40 spin_lock(&drv->lock);41 ret = inst->cfg->power_on(inst);42 spin_unlock(&drv->lock);43 if (ret)44 goto err_power_on;45 }46 47 return 0;48 49err_power_on:50 clk_disable_unprepare(drv->ref_clk);51err_instance_clk:52 clk_disable_unprepare(drv->clk);53err_main_clk:54 if (drv->vbus)55 regulator_disable(drv->vbus);56err_regulator:57 return ret;58}59 60static int samsung_usb2_phy_power_off(struct phy *phy)61{62 struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);63 struct samsung_usb2_phy_driver *drv = inst->drv;64 int ret = 0;65 66 dev_dbg(drv->dev, "Request to power_off \"%s\" usb phy\n",67 inst->cfg->label);68 if (inst->cfg->power_off) {69 spin_lock(&drv->lock);70 ret = inst->cfg->power_off(inst);71 spin_unlock(&drv->lock);72 if (ret)73 return ret;74 }75 clk_disable_unprepare(drv->ref_clk);76 clk_disable_unprepare(drv->clk);77 if (drv->vbus)78 ret = regulator_disable(drv->vbus);79 80 return ret;81}82 83static const struct phy_ops samsung_usb2_phy_ops = {84 .power_on = samsung_usb2_phy_power_on,85 .power_off = samsung_usb2_phy_power_off,86 .owner = THIS_MODULE,87};88 89static struct phy *samsung_usb2_phy_xlate(struct device *dev,90 const struct of_phandle_args *args)91{92 struct samsung_usb2_phy_driver *drv;93 94 drv = dev_get_drvdata(dev);95 if (!drv)96 return ERR_PTR(-EINVAL);97 98 if (WARN_ON(args->args[0] >= drv->cfg->num_phys))99 return ERR_PTR(-ENODEV);100 101 return drv->instances[args->args[0]].phy;102}103 104static const struct of_device_id samsung_usb2_phy_of_match[] = {105#ifdef CONFIG_PHY_EXYNOS4X12_USB2106 {107 .compatible = "samsung,exynos3250-usb2-phy",108 .data = &exynos3250_usb2_phy_config,109 },110#endif111#ifdef CONFIG_PHY_EXYNOS4210_USB2112 {113 .compatible = "samsung,exynos4210-usb2-phy",114 .data = &exynos4210_usb2_phy_config,115 },116#endif117#ifdef CONFIG_PHY_EXYNOS4X12_USB2118 {119 .compatible = "samsung,exynos4x12-usb2-phy",120 .data = &exynos4x12_usb2_phy_config,121 },122#endif123#ifdef CONFIG_PHY_EXYNOS5250_USB2124 {125 .compatible = "samsung,exynos5250-usb2-phy",126 .data = &exynos5250_usb2_phy_config,127 },128 {129 .compatible = "samsung,exynos5420-usb2-phy",130 .data = &exynos5420_usb2_phy_config,131 },132#endif133#ifdef CONFIG_PHY_S5PV210_USB2134 {135 .compatible = "samsung,s5pv210-usb2-phy",136 .data = &s5pv210_usb2_phy_config,137 },138#endif139 { },140};141MODULE_DEVICE_TABLE(of, samsung_usb2_phy_of_match);142 143static int samsung_usb2_phy_probe(struct platform_device *pdev)144{145 const struct samsung_usb2_phy_config *cfg;146 struct device *dev = &pdev->dev;147 struct phy_provider *phy_provider;148 struct samsung_usb2_phy_driver *drv;149 int i, ret;150 151 if (!pdev->dev.of_node) {152 dev_err(dev, "This driver is required to be instantiated from device tree\n");153 return -EINVAL;154 }155 156 cfg = of_device_get_match_data(dev);157 if (!cfg)158 return -EINVAL;159 160 drv = devm_kzalloc(dev, struct_size(drv, instances, cfg->num_phys),161 GFP_KERNEL);162 if (!drv)163 return -ENOMEM;164 165 dev_set_drvdata(dev, drv);166 spin_lock_init(&drv->lock);167 168 drv->cfg = cfg;169 drv->dev = dev;170 171 drv->reg_phy = devm_platform_ioremap_resource(pdev, 0);172 if (IS_ERR(drv->reg_phy)) {173 dev_err(dev, "Failed to map register memory (phy)\n");174 return PTR_ERR(drv->reg_phy);175 }176 177 drv->reg_pmu = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,178 "samsung,pmureg-phandle");179 if (IS_ERR(drv->reg_pmu)) {180 dev_err(dev, "Failed to map PMU registers (via syscon)\n");181 return PTR_ERR(drv->reg_pmu);182 }183 184 if (drv->cfg->has_mode_switch) {185 drv->reg_sys = syscon_regmap_lookup_by_phandle(186 pdev->dev.of_node, "samsung,sysreg-phandle");187 if (IS_ERR(drv->reg_sys)) {188 dev_err(dev, "Failed to map system registers (via syscon)\n");189 return PTR_ERR(drv->reg_sys);190 }191 }192 193 drv->clk = devm_clk_get(dev, "phy");194 if (IS_ERR(drv->clk)) {195 dev_err(dev, "Failed to get clock of phy controller\n");196 return PTR_ERR(drv->clk);197 }198 199 drv->ref_clk = devm_clk_get(dev, "ref");200 if (IS_ERR(drv->ref_clk)) {201 dev_err(dev, "Failed to get reference clock for the phy controller\n");202 return PTR_ERR(drv->ref_clk);203 }204 205 drv->ref_rate = clk_get_rate(drv->ref_clk);206 if (drv->cfg->rate_to_clk) {207 ret = drv->cfg->rate_to_clk(drv->ref_rate, &drv->ref_reg_val);208 if (ret)209 return ret;210 }211 212 drv->vbus = devm_regulator_get(dev, "vbus");213 if (IS_ERR(drv->vbus)) {214 ret = PTR_ERR(drv->vbus);215 if (ret == -EPROBE_DEFER)216 return ret;217 drv->vbus = NULL;218 }219 220 for (i = 0; i < drv->cfg->num_phys; i++) {221 char *label = drv->cfg->phys[i].label;222 struct samsung_usb2_phy_instance *p = &drv->instances[i];223 224 dev_dbg(dev, "Creating phy \"%s\"\n", label);225 p->phy = devm_phy_create(dev, NULL, &samsung_usb2_phy_ops);226 if (IS_ERR(p->phy)) {227 dev_err(drv->dev, "Failed to create usb2_phy \"%s\"\n",228 label);229 return PTR_ERR(p->phy);230 }231 232 p->cfg = &drv->cfg->phys[i];233 p->drv = drv;234 phy_set_bus_width(p->phy, 8);235 phy_set_drvdata(p->phy, p);236 }237 238 phy_provider = devm_of_phy_provider_register(dev,239 samsung_usb2_phy_xlate);240 if (IS_ERR(phy_provider)) {241 dev_err(drv->dev, "Failed to register phy provider\n");242 return PTR_ERR(phy_provider);243 }244 245 return 0;246}247 248static struct platform_driver samsung_usb2_phy_driver = {249 .probe = samsung_usb2_phy_probe,250 .driver = {251 .of_match_table = samsung_usb2_phy_of_match,252 .name = "samsung-usb2-phy",253 .suppress_bind_attrs = true,254 }255};256 257module_platform_driver(samsung_usb2_phy_driver);258MODULE_DESCRIPTION("Samsung S5P/Exynos SoC USB PHY driver");259MODULE_AUTHOR("Kamil Debski <k.debski@samsung.com>");260MODULE_LICENSE("GPL v2");261MODULE_ALIAS("platform:samsung-usb2-phy");262