1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Samsung SoC USB 1.1/2.0 PHY driver 4 * 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/of_address.h> 14 #include <linux/of_device.h> 15 #include <linux/phy/phy.h> 16 #include <linux/platform_device.h> 17 #include <linux/spinlock.h> 18 #include "phy-samsung-usb2.h" 19 20 static int samsung_usb2_phy_power_on(struct phy *phy) 21 { 22 struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy); 23 struct samsung_usb2_phy_driver *drv = inst->drv; 24 int ret; 25 26 dev_dbg(drv->dev, "Request to power_on \"%s\" usb phy\n", 27 inst->cfg->label); 28 29 if (drv->vbus) { 30 ret = regulator_enable(drv->vbus); 31 if (ret) 32 goto err_regulator; 33 } 34 35 ret = clk_prepare_enable(drv->clk); 36 if (ret) 37 goto err_main_clk; 38 ret = clk_prepare_enable(drv->ref_clk); 39 if (ret) 40 goto err_instance_clk; 41 if (inst->cfg->power_on) { 42 spin_lock(&drv->lock); 43 ret = inst->cfg->power_on(inst); 44 spin_unlock(&drv->lock); 45 if (ret) 46 goto err_power_on; 47 } 48 49 return 0; 50 51 err_power_on: 52 clk_disable_unprepare(drv->ref_clk); 53 err_instance_clk: 54 clk_disable_unprepare(drv->clk); 55 err_main_clk: 56 if (drv->vbus) 57 regulator_disable(drv->vbus); 58 err_regulator: 59 return ret; 60 } 61 62 static int samsung_usb2_phy_power_off(struct phy *phy) 63 { 64 struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy); 65 struct samsung_usb2_phy_driver *drv = inst->drv; 66 int ret = 0; 67 68 dev_dbg(drv->dev, "Request to power_off \"%s\" usb phy\n", 69 inst->cfg->label); 70 if (inst->cfg->power_off) { 71 spin_lock(&drv->lock); 72 ret = inst->cfg->power_off(inst); 73 spin_unlock(&drv->lock); 74 if (ret) 75 return ret; 76 } 77 clk_disable_unprepare(drv->ref_clk); 78 clk_disable_unprepare(drv->clk); 79 if (drv->vbus) 80 ret = regulator_disable(drv->vbus); 81 82 return ret; 83 } 84 85 static const struct phy_ops samsung_usb2_phy_ops = { 86 .power_on = samsung_usb2_phy_power_on, 87 .power_off = samsung_usb2_phy_power_off, 88 .owner = THIS_MODULE, 89 }; 90 91 static struct phy *samsung_usb2_phy_xlate(struct device *dev, 92 struct of_phandle_args *args) 93 { 94 struct samsung_usb2_phy_driver *drv; 95 96 drv = dev_get_drvdata(dev); 97 if (!drv) 98 return ERR_PTR(-EINVAL); 99 100 if (WARN_ON(args->args[0] >= drv->cfg->num_phys)) 101 return ERR_PTR(-ENODEV); 102 103 return drv->instances[args->args[0]].phy; 104 } 105 106 static const struct of_device_id samsung_usb2_phy_of_match[] = { 107 #ifdef CONFIG_PHY_EXYNOS4X12_USB2 108 { 109 .compatible = "samsung,exynos3250-usb2-phy", 110 .data = &exynos3250_usb2_phy_config, 111 }, 112 #endif 113 #ifdef CONFIG_PHY_EXYNOS4210_USB2 114 { 115 .compatible = "samsung,exynos4210-usb2-phy", 116 .data = &exynos4210_usb2_phy_config, 117 }, 118 #endif 119 #ifdef CONFIG_PHY_EXYNOS4X12_USB2 120 { 121 .compatible = "samsung,exynos4x12-usb2-phy", 122 .data = &exynos4x12_usb2_phy_config, 123 }, 124 #endif 125 #ifdef CONFIG_PHY_EXYNOS5250_USB2 126 { 127 .compatible = "samsung,exynos5250-usb2-phy", 128 .data = &exynos5250_usb2_phy_config, 129 }, 130 #endif 131 #ifdef CONFIG_PHY_S5PV210_USB2 132 { 133 .compatible = "samsung,s5pv210-usb2-phy", 134 .data = &s5pv210_usb2_phy_config, 135 }, 136 #endif 137 { }, 138 }; 139 MODULE_DEVICE_TABLE(of, samsung_usb2_phy_of_match); 140 141 static int samsung_usb2_phy_probe(struct platform_device *pdev) 142 { 143 const struct samsung_usb2_phy_config *cfg; 144 struct device *dev = &pdev->dev; 145 struct phy_provider *phy_provider; 146 struct resource *mem; 147 struct samsung_usb2_phy_driver *drv; 148 int i, ret; 149 150 if (!pdev->dev.of_node) { 151 dev_err(dev, "This driver is required to be instantiated from device tree\n"); 152 return -EINVAL; 153 } 154 155 cfg = of_device_get_match_data(dev); 156 if (!cfg) 157 return -EINVAL; 158 159 drv = devm_kzalloc(dev, sizeof(struct samsung_usb2_phy_driver) + 160 cfg->num_phys * sizeof(struct samsung_usb2_phy_instance), 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 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 172 drv->reg_phy = devm_ioremap_resource(dev, mem); 173 if (IS_ERR(drv->reg_phy)) { 174 dev_err(dev, "Failed to map register memory (phy)\n"); 175 return PTR_ERR(drv->reg_phy); 176 } 177 178 drv->reg_pmu = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, 179 "samsung,pmureg-phandle"); 180 if (IS_ERR(drv->reg_pmu)) { 181 dev_err(dev, "Failed to map PMU registers (via syscon)\n"); 182 return PTR_ERR(drv->reg_pmu); 183 } 184 185 if (drv->cfg->has_mode_switch) { 186 drv->reg_sys = syscon_regmap_lookup_by_phandle( 187 pdev->dev.of_node, "samsung,sysreg-phandle"); 188 if (IS_ERR(drv->reg_sys)) { 189 dev_err(dev, "Failed to map system registers (via syscon)\n"); 190 return PTR_ERR(drv->reg_sys); 191 } 192 } 193 194 drv->clk = devm_clk_get(dev, "phy"); 195 if (IS_ERR(drv->clk)) { 196 dev_err(dev, "Failed to get clock of phy controller\n"); 197 return PTR_ERR(drv->clk); 198 } 199 200 drv->ref_clk = devm_clk_get(dev, "ref"); 201 if (IS_ERR(drv->ref_clk)) { 202 dev_err(dev, "Failed to get reference clock for the phy controller\n"); 203 return PTR_ERR(drv->ref_clk); 204 } 205 206 drv->ref_rate = clk_get_rate(drv->ref_clk); 207 if (drv->cfg->rate_to_clk) { 208 ret = drv->cfg->rate_to_clk(drv->ref_rate, &drv->ref_reg_val); 209 if (ret) 210 return ret; 211 } 212 213 drv->vbus = devm_regulator_get(dev, "vbus"); 214 if (IS_ERR(drv->vbus)) { 215 ret = PTR_ERR(drv->vbus); 216 if (ret == -EPROBE_DEFER) 217 return ret; 218 drv->vbus = NULL; 219 } 220 221 for (i = 0; i < drv->cfg->num_phys; i++) { 222 char *label = drv->cfg->phys[i].label; 223 struct samsung_usb2_phy_instance *p = &drv->instances[i]; 224 225 dev_dbg(dev, "Creating phy \"%s\"\n", label); 226 p->phy = devm_phy_create(dev, NULL, &samsung_usb2_phy_ops); 227 if (IS_ERR(p->phy)) { 228 dev_err(drv->dev, "Failed to create usb2_phy \"%s\"\n", 229 label); 230 return PTR_ERR(p->phy); 231 } 232 233 p->cfg = &drv->cfg->phys[i]; 234 p->drv = drv; 235 phy_set_bus_width(p->phy, 8); 236 phy_set_drvdata(p->phy, p); 237 } 238 239 phy_provider = devm_of_phy_provider_register(dev, 240 samsung_usb2_phy_xlate); 241 if (IS_ERR(phy_provider)) { 242 dev_err(drv->dev, "Failed to register phy provider\n"); 243 return PTR_ERR(phy_provider); 244 } 245 246 return 0; 247 } 248 249 static struct platform_driver samsung_usb2_phy_driver = { 250 .probe = samsung_usb2_phy_probe, 251 .driver = { 252 .of_match_table = samsung_usb2_phy_of_match, 253 .name = "samsung-usb2-phy", 254 } 255 }; 256 257 module_platform_driver(samsung_usb2_phy_driver); 258 MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC USB PHY driver"); 259 MODULE_AUTHOR("Kamil Debski <k.debski@samsung.com>"); 260 MODULE_LICENSE("GPL v2"); 261 MODULE_ALIAS("platform:samsung-usb2-phy"); 262