drivers/phy/samsung/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/of_device.h>
  18 #include <linux/phy/phy.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/spinlock.h>
  21 #include "phy-samsung-usb2.h"
  22
  23 static int samsung_usb2_phy_power_on(struct phy *phy)
  24 {
  25         struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
  26         struct samsung_usb2_phy_driver *drv = inst->drv;
  27         int ret;
  28
  29         dev_dbg(drv->dev, "Request to power_on \"%s\" usb phy\n",
  30                 inst->cfg->label);
  31
  32         if (drv->vbus) {
  33                 ret = regulator_enable(drv->vbus);
  34                 if (ret)
  35                         goto err_regulator;
  36         }
  37
  38         ret = clk_prepare_enable(drv->clk);
  39         if (ret)
  40                 goto err_main_clk;
  41         ret = clk_prepare_enable(drv->ref_clk);
  42         if (ret)
  43                 goto err_instance_clk;
  44         if (inst->cfg->power_on) {
  45                 spin_lock(&drv->lock);
  46                 ret = inst->cfg->power_on(inst);
  47                 spin_unlock(&drv->lock);
  48                 if (ret)
  49                         goto err_power_on;
  50         }
  51
  52         return 0;
  53
  54 err_power_on:
  55         clk_disable_unprepare(drv->ref_clk);
  56 err_instance_clk:
  57         clk_disable_unprepare(drv->clk);
  58 err_main_clk:
  59         if (drv->vbus)
  60                 regulator_disable(drv->vbus);
  61 err_regulator:
  62         return ret;
  63 }
  64
  65 static int samsung_usb2_phy_power_off(struct phy *phy)
  66 {
  67         struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
  68         struct samsung_usb2_phy_driver *drv = inst->drv;
  69         int ret = 0;
  70
  71         dev_dbg(drv->dev, "Request to power_off \"%s\" usb phy\n",
  72                 inst->cfg->label);
  73         if (inst->cfg->power_off) {
  74                 spin_lock(&drv->lock);
  75                 ret = inst->cfg->power_off(inst);
  76                 spin_unlock(&drv->lock);
  77                 if (ret)
  78                         return ret;
  79         }
  80         clk_disable_unprepare(drv->ref_clk);
  81         clk_disable_unprepare(drv->clk);
  82         if (drv->vbus)
  83                 ret = regulator_disable(drv->vbus);
  84
  85         return ret;
  86 }
  87
  88 static const struct phy_ops samsung_usb2_phy_ops = {
  89         .power_on       = samsung_usb2_phy_power_on,
  90         .power_off      = samsung_usb2_phy_power_off,
  91         .owner          = THIS_MODULE,
  92 };
  93
  94 static struct phy *samsung_usb2_phy_xlate(struct device *dev,
  95                                         struct of_phandle_args *args)
  96 {
  97         struct samsung_usb2_phy_driver *drv;
  98
  99         drv = dev_get_drvdata(dev);
 100         if (!drv)
 101                 return ERR_PTR(-EINVAL);
 102
 103         if (WARN_ON(args->args[0] >= drv->cfg->num_phys))
 104                 return ERR_PTR(-ENODEV);
 105
 106         return drv->instances[args->args[0]].phy;
 107 }
 108
 109 static const struct of_device_id samsung_usb2_phy_of_match[] = {
 110 #ifdef CONFIG_PHY_EXYNOS4X12_USB2
 111         {
 112                 .compatible = "samsung,exynos3250-usb2-phy",
 113                 .data = &exynos3250_usb2_phy_config,
 114         },
 115 #endif
 116 #ifdef CONFIG_PHY_EXYNOS4210_USB2
 117         {
 118                 .compatible = "samsung,exynos4210-usb2-phy",
 119                 .data = &exynos4210_usb2_phy_config,
 120         },
 121 #endif
 122 #ifdef CONFIG_PHY_EXYNOS4X12_USB2
 123         {
 124                 .compatible = "samsung,exynos4x12-usb2-phy",
 125                 .data = &exynos4x12_usb2_phy_config,
 126         },
 127 #endif
 128 #ifdef CONFIG_PHY_EXYNOS5250_USB2
 129         {
 130                 .compatible = "samsung,exynos5250-usb2-phy",
 131                 .data = &exynos5250_usb2_phy_config,
 132         },
 133 #endif
 134 #ifdef CONFIG_PHY_S5PV210_USB2
 135         {
 136                 .compatible = "samsung,s5pv210-usb2-phy",
 137                 .data = &s5pv210_usb2_phy_config,
 138         },
 139 #endif
 140         { },
 141 };
 142 MODULE_DEVICE_TABLE(of, samsung_usb2_phy_of_match);
 143
 144 static int samsung_usb2_phy_probe(struct platform_device *pdev)
 145 {
 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         cfg = of_device_get_match_data(dev);
 159         if (!cfg)
 160                 return -EINVAL;
 161
 162         drv = devm_kzalloc(dev, sizeof(struct samsung_usb2_phy_driver) +
 163                 cfg->num_phys * sizeof(struct samsung_usb2_phy_instance),
 164                                                                 GFP_KERNEL);
 165         if (!drv)
 166                 return -ENOMEM;
 167
 168         dev_set_drvdata(dev, drv);
 169         spin_lock_init(&drv->lock);
 170
 171         drv->cfg = cfg;
 172         drv->dev = dev;
 173
 174         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 175         drv->reg_phy = devm_ioremap_resource(dev, mem);
 176         if (IS_ERR(drv->reg_phy)) {
 177                 dev_err(dev, "Failed to map register memory (phy)\n");
 178                 return PTR_ERR(drv->reg_phy);
 179         }
 180
 181         drv->reg_pmu = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
 182                 "samsung,pmureg-phandle");
 183         if (IS_ERR(drv->reg_pmu)) {
 184                 dev_err(dev, "Failed to map PMU registers (via syscon)\n");
 185                 return PTR_ERR(drv->reg_pmu);
 186         }
 187
 188         if (drv->cfg->has_mode_switch) {
 189                 drv->reg_sys = syscon_regmap_lookup_by_phandle(
 190                                 pdev->dev.of_node, "samsung,sysreg-phandle");
 191                 if (IS_ERR(drv->reg_sys)) {
 192                         dev_err(dev, "Failed to map system registers (via syscon)\n");
 193                         return PTR_ERR(drv->reg_sys);
 194                 }
 195         }
 196
 197         drv->clk = devm_clk_get(dev, "phy");
 198         if (IS_ERR(drv->clk)) {
 199                 dev_err(dev, "Failed to get clock of phy controller\n");
 200                 return PTR_ERR(drv->clk);
 201         }
 202
 203         drv->ref_clk = devm_clk_get(dev, "ref");
 204         if (IS_ERR(drv->ref_clk)) {
 205                 dev_err(dev, "Failed to get reference clock for the phy controller\n");
 206                 return PTR_ERR(drv->ref_clk);
 207         }
 208
 209         drv->ref_rate = clk_get_rate(drv->ref_clk);
 210         if (drv->cfg->rate_to_clk) {
 211                 ret = drv->cfg->rate_to_clk(drv->ref_rate, &drv->ref_reg_val);
 212                 if (ret)
 213                         return ret;
 214         }
 215
 216         drv->vbus = devm_regulator_get(dev, "vbus");
 217         if (IS_ERR(drv->vbus)) {
 218                 ret = PTR_ERR(drv->vbus);
 219                 if (ret == -EPROBE_DEFER)
 220                         return ret;
 221                 drv->vbus = NULL;
 222         }
 223
 224         for (i = 0; i < drv->cfg->num_phys; i++) {
 225                 char *label = drv->cfg->phys[i].label;
 226                 struct samsung_usb2_phy_instance *p = &drv->instances[i];
 227
 228                 dev_dbg(dev, "Creating phy \"%s\"\n", label);
 229                 p->phy = devm_phy_create(dev, NULL, &samsung_usb2_phy_ops);
 230                 if (IS_ERR(p->phy)) {
 231                         dev_err(drv->dev, "Failed to create usb2_phy \"%s\"\n",
 232                                 label);
 233                         return PTR_ERR(p->phy);
 234                 }
 235
 236                 p->cfg = &drv->cfg->phys[i];
 237                 p->drv = drv;
 238                 phy_set_bus_width(p->phy, 8);
 239                 phy_set_drvdata(p->phy, p);
 240         }
 241
 242         phy_provider = devm_of_phy_provider_register(dev,
 243                                                         samsung_usb2_phy_xlate);
 244         if (IS_ERR(phy_provider)) {
 245                 dev_err(drv->dev, "Failed to register phy provider\n");
 246                 return PTR_ERR(phy_provider);
 247         }
 248
 249         return 0;
 250 }
 251
 252 static struct platform_driver samsung_usb2_phy_driver = {
 253         .probe  = samsung_usb2_phy_probe,
 254         .driver = {
 255                 .of_match_table = samsung_usb2_phy_of_match,
 256                 .name           = "samsung-usb2-phy",
 257         }
 258 };
 259
 260 module_platform_driver(samsung_usb2_phy_driver);
 261 MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC USB PHY driver");
 262 MODULE_AUTHOR("Kamil Debski <k.debski@samsung.com>");
 263 MODULE_LICENSE("GPL v2");
 264 MODULE_ALIAS("platform:samsung-usb2-phy");