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

   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
  31         if (drv->vbus) {
  32                 ret = regulator_enable(drv->vbus);
  33                 if (ret)
  34                         goto err_regulator;
  35         }
  36
  37         ret = clk_prepare_enable(drv->clk);
  38         if (ret)
  39                 goto err_main_clk;
  40         ret = clk_prepare_enable(drv->ref_clk);
  41         if (ret)
  42                 goto err_instance_clk;
  43         if (inst->cfg->power_on) {
  44                 spin_lock(&drv->lock);
  45                 ret = inst->cfg->power_on(inst);
  46                 spin_unlock(&drv->lock);
  47                 if (ret)
  48                         goto err_power_on;
  49         }
  50
  51         return 0;
  52
  53 err_power_on:
  54         clk_disable_unprepare(drv->ref_clk);
  55 err_instance_clk:
  56         clk_disable_unprepare(drv->clk);
  57 err_main_clk:
  58         if (drv->vbus)
  59                 regulator_disable(drv->vbus);
  60 err_regulator:
  61         return ret;
  62 }
  63
  64 static int samsung_usb2_phy_power_off(struct phy *phy)
  65 {
  66         struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
  67         struct samsung_usb2_phy_driver *drv = inst->drv;
  68         int ret = 0;
  69
  70         dev_dbg(drv->dev, "Request to power_off \"%s\" usb phy\n",
  71                 inst->cfg->label);
  72         if (inst->cfg->power_off) {
  73                 spin_lock(&drv->lock);
  74                 ret = inst->cfg->power_off(inst);
  75                 spin_unlock(&drv->lock);
  76                 if (ret)
  77                         return ret;
  78         }
  79         clk_disable_unprepare(drv->ref_clk);
  80         clk_disable_unprepare(drv->clk);
  81         if (drv->vbus)
  82                 ret = regulator_disable(drv->vbus);
  83
  84         return ret;
  85 }
  86
  87 static const struct phy_ops samsung_usb2_phy_ops = {
  88         .power_on       = samsung_usb2_phy_power_on,
  89         .power_off      = samsung_usb2_phy_power_off,
  90         .owner          = THIS_MODULE,
  91 };
  92
  93 static struct phy *samsung_usb2_phy_xlate(struct device *dev,
  94                                         struct of_phandle_args *args)
  95 {
  96         struct samsung_usb2_phy_driver *drv;
  97
  98         drv = dev_get_drvdata(dev);
  99         if (!drv)
 100                 return ERR_PTR(-EINVAL);
 101
 102         if (WARN_ON(args->args[0] >= drv->cfg->num_phys))
 103                 return ERR_PTR(-ENODEV);
 104
 105         return drv->instances[args->args[0]].phy;
 106 }
 107
 108 static const struct of_device_id samsung_usb2_phy_of_match[] = {
 109 #ifdef CONFIG_PHY_EXYNOS4X12_USB2
 110         {
 111                 .compatible = "samsung,exynos3250-usb2-phy",
 112                 .data = &exynos3250_usb2_phy_config,
 113         },
 114 #endif
 115 #ifdef CONFIG_PHY_EXYNOS4210_USB2
 116         {
 117                 .compatible = "samsung,exynos4210-usb2-phy",
 118                 .data = &exynos4210_usb2_phy_config,
 119         },
 120 #endif
 121 #ifdef CONFIG_PHY_EXYNOS4X12_USB2
 122         {
 123                 .compatible = "samsung,exynos4x12-usb2-phy",
 124                 .data = &exynos4x12_usb2_phy_config,
 125         },
 126 #endif
 127 #ifdef CONFIG_PHY_EXYNOS5250_USB2
 128         {
 129                 .compatible = "samsung,exynos5250-usb2-phy",
 130                 .data = &exynos5250_usb2_phy_config,
 131         },
 132 #endif
 133 #ifdef CONFIG_PHY_S5PV210_USB2
 134         {
 135                 .compatible = "samsung,s5pv210-usb2-phy",
 136                 .data = &s5pv210_usb2_phy_config,
 137         },
 138 #endif
 139         { },
 140 };
 141 MODULE_DEVICE_TABLE(of, samsung_usb2_phy_of_match);
 142
 143 static int samsung_usb2_phy_probe(struct platform_device *pdev)
 144 {
 145         const struct of_device_id *match;
 146         const struct samsung_usb2_phy_config *cfg;
 147         struct device *dev = &pdev->dev;
 148         struct phy_provider *phy_provider;
 149         struct resource *mem;
 150         struct samsung_usb2_phy_driver *drv;
 151         int i, ret;
 152
 153         if (!pdev->dev.of_node) {
 154                 dev_err(dev, "This driver is required to be instantiated from device tree\n");
 155                 return -EINVAL;
 156         }
 157
 158         match = of_match_node(samsung_usb2_phy_of_match, pdev->dev.of_node);
 159         if (!match) {
 160                 dev_err(dev, "of_match_node() failed\n");
 161                 return -EINVAL;
 162         }
 163         cfg = match->data;
 164
 165         drv = devm_kzalloc(dev, sizeof(struct samsung_usb2_phy_driver) +
 166                 cfg->num_phys * sizeof(struct samsung_usb2_phy_instance),
 167                                                                 GFP_KERNEL);
 168         if (!drv)
 169                 return -ENOMEM;
 170
 171         dev_set_drvdata(dev, drv);
 172         spin_lock_init(&drv->lock);
 173
 174         drv->cfg = cfg;
 175         drv->dev = dev;
 176
 177         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 178         drv->reg_phy = devm_ioremap_resource(dev, mem);
 179         if (IS_ERR(drv->reg_phy)) {
 180                 dev_err(dev, "Failed to map register memory (phy)\n");
 181                 return PTR_ERR(drv->reg_phy);
 182         }
 183
 184         drv->reg_pmu = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
 185                 "samsung,pmureg-phandle");
 186         if (IS_ERR(drv->reg_pmu)) {
 187                 dev_err(dev, "Failed to map PMU registers (via syscon)\n");
 188                 return PTR_ERR(drv->reg_pmu);
 189         }
 190
 191         if (drv->cfg->has_mode_switch) {
 192                 drv->reg_sys = syscon_regmap_lookup_by_phandle(
 193                                 pdev->dev.of_node, "samsung,sysreg-phandle");
 194                 if (IS_ERR(drv->reg_sys)) {
 195                         dev_err(dev, "Failed to map system registers (via syscon)\n");
 196                         return PTR_ERR(drv->reg_sys);
 197                 }
 198         }
 199
 200         drv->clk = devm_clk_get(dev, "phy");
 201         if (IS_ERR(drv->clk)) {
 202                 dev_err(dev, "Failed to get clock of phy controller\n");
 203                 return PTR_ERR(drv->clk);
 204         }
 205
 206         drv->ref_clk = devm_clk_get(dev, "ref");
 207         if (IS_ERR(drv->ref_clk)) {
 208                 dev_err(dev, "Failed to get reference clock for the phy controller\n");
 209                 return PTR_ERR(drv->ref_clk);
 210         }
 211
 212         drv->ref_rate = clk_get_rate(drv->ref_clk);
 213         if (drv->cfg->rate_to_clk) {
 214                 ret = drv->cfg->rate_to_clk(drv->ref_rate, &drv->ref_reg_val);
 215                 if (ret)
 216                         return ret;
 217         }
 218
 219         drv->vbus = devm_regulator_get(dev, "vbus");
 220         if (IS_ERR(drv->vbus)) {
 221                 ret = PTR_ERR(drv->vbus);
 222                 if (ret == -EPROBE_DEFER)
 223                         return ret;
 224                 drv->vbus = NULL;
 225         }
 226
 227         for (i = 0; i < drv->cfg->num_phys; i++) {
 228                 char *label = drv->cfg->phys[i].label;
 229                 struct samsung_usb2_phy_instance *p = &drv->instances[i];
 230
 231                 dev_dbg(dev, "Creating phy \"%s\"\n", label);
 232                 p->phy = devm_phy_create(dev, NULL, &samsung_usb2_phy_ops);
 233                 if (IS_ERR(p->phy)) {
 234                         dev_err(drv->dev, "Failed to create usb2_phy \"%s\"\n",
 235                                 label);
 236                         return PTR_ERR(p->phy);
 237                 }
 238
 239                 p->cfg = &drv->cfg->phys[i];
 240                 p->drv = drv;
 241                 phy_set_bus_width(p->phy, 8);
 242                 phy_set_drvdata(p->phy, p);
 243         }
 244
 245         phy_provider = devm_of_phy_provider_register(dev,
 246                                                         samsung_usb2_phy_xlate);
 247         if (IS_ERR(phy_provider)) {
 248                 dev_err(drv->dev, "Failed to register phy provider\n");
 249                 return PTR_ERR(phy_provider);
 250         }
 251
 252         return 0;
 253 }
 254
 255 static struct platform_driver samsung_usb2_phy_driver = {
 256         .probe  = samsung_usb2_phy_probe,
 257         .driver = {
 258                 .of_match_table = samsung_usb2_phy_of_match,
 259                 .name           = "samsung-usb2-phy",
 260         }
 261 };
 262
 263 module_platform_driver(samsung_usb2_phy_driver);
 264 MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC USB PHY driver");
 265 MODULE_AUTHOR("Kamil Debski <k.debski@samsung.com>");
 266 MODULE_LICENSE("GPL v2");
 267 MODULE_ALIAS("platform:samsung-usb2-phy");