drivers/phy/samsung/phy-samsung-usb2.c

   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, struct_size(drv, instances, cfg->num_phys),
 160                            GFP_KERNEL);
 161         if (!drv)
 162                 return -ENOMEM;
 163
 164         dev_set_drvdata(dev, drv);
 165         spin_lock_init(&drv->lock);
 166
 167         drv->cfg = cfg;
 168         drv->dev = dev;
 169
 170         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 171         drv->reg_phy = devm_ioremap_resource(dev, mem);
 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
 248 static 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
 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");