drivers/usb/dwc3/dwc3-exynos.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /**
   3  * dwc3-exynos.c - Samsung EXYNOS DWC3 Specific Glue layer
   4  *
   5  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   6  *              http://www.samsung.com
   7  *
   8  * Author: Anton Tikhomirov <av.tikhomirov@samsung.com>
   9  *
  10  * This program is free software: you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2  of
  12  * the License as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/kernel.h>
  22 #include <linux/slab.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/clk.h>
  25 #include <linux/usb/otg.h>
  26 #include <linux/usb/usb_phy_generic.h>
  27 #include <linux/of.h>
  28 #include <linux/of_platform.h>
  29 #include <linux/regulator/consumer.h>
  30
  31 struct dwc3_exynos {
  32         struct platform_device  *usb2_phy;
  33         struct platform_device  *usb3_phy;
  34         struct device           *dev;
  35
  36         struct clk              *clk;
  37         struct clk              *susp_clk;
  38         struct clk              *axius_clk;
  39
  40         struct regulator        *vdd33;
  41         struct regulator        *vdd10;
  42 };
  43
  44 static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
  45 {
  46         struct usb_phy_generic_platform_data pdata;
  47         struct platform_device  *pdev;
  48         int                     ret;
  49
  50         memset(&pdata, 0x00, sizeof(pdata));
  51
  52         pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
  53         if (!pdev)
  54                 return -ENOMEM;
  55
  56         exynos->usb2_phy = pdev;
  57         pdata.type = USB_PHY_TYPE_USB2;
  58         pdata.gpio_reset = -1;
  59
  60         ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
  61         if (ret)
  62                 goto err1;
  63
  64         pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
  65         if (!pdev) {
  66                 ret = -ENOMEM;
  67                 goto err1;
  68         }
  69
  70         exynos->usb3_phy = pdev;
  71         pdata.type = USB_PHY_TYPE_USB3;
  72
  73         ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
  74         if (ret)
  75                 goto err2;
  76
  77         ret = platform_device_add(exynos->usb2_phy);
  78         if (ret)
  79                 goto err2;
  80
  81         ret = platform_device_add(exynos->usb3_phy);
  82         if (ret)
  83                 goto err3;
  84
  85         return 0;
  86
  87 err3:
  88         platform_device_del(exynos->usb2_phy);
  89
  90 err2:
  91         platform_device_put(exynos->usb3_phy);
  92
  93 err1:
  94         platform_device_put(exynos->usb2_phy);
  95
  96         return ret;
  97 }
  98
  99 static int dwc3_exynos_remove_child(struct device *dev, void *unused)
 100 {
 101         struct platform_device *pdev = to_platform_device(dev);
 102
 103         platform_device_unregister(pdev);
 104
 105         return 0;
 106 }
 107
 108 static int dwc3_exynos_probe(struct platform_device *pdev)
 109 {
 110         struct dwc3_exynos      *exynos;
 111         struct device           *dev = &pdev->dev;
 112         struct device_node      *node = dev->of_node;
 113
 114         int                     ret;
 115
 116         exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
 117         if (!exynos)
 118                 return -ENOMEM;
 119
 120         platform_set_drvdata(pdev, exynos);
 121
 122         exynos->dev     = dev;
 123
 124         exynos->clk = devm_clk_get(dev, "usbdrd30");
 125         if (IS_ERR(exynos->clk)) {
 126                 dev_err(dev, "couldn't get clock\n");
 127                 return -EINVAL;
 128         }
 129         ret = clk_prepare_enable(exynos->clk);
 130         if (ret)
 131                 return ret;
 132
 133         exynos->susp_clk = devm_clk_get(dev, "usbdrd30_susp_clk");
 134         if (IS_ERR(exynos->susp_clk))
 135                 exynos->susp_clk = NULL;
 136         ret = clk_prepare_enable(exynos->susp_clk);
 137         if (ret)
 138                 goto susp_clk_err;
 139
 140         if (of_device_is_compatible(node, "samsung,exynos7-dwusb3")) {
 141                 exynos->axius_clk = devm_clk_get(dev, "usbdrd30_axius_clk");
 142                 if (IS_ERR(exynos->axius_clk)) {
 143                         dev_err(dev, "no AXI UpScaler clk specified\n");
 144                         ret = -ENODEV;
 145                         goto axius_clk_err;
 146                 }
 147                 ret = clk_prepare_enable(exynos->axius_clk);
 148                 if (ret)
 149                         goto axius_clk_err;
 150         } else {
 151                 exynos->axius_clk = NULL;
 152         }
 153
 154         exynos->vdd33 = devm_regulator_get(dev, "vdd33");
 155         if (IS_ERR(exynos->vdd33)) {
 156                 ret = PTR_ERR(exynos->vdd33);
 157                 goto vdd33_err;
 158         }
 159         ret = regulator_enable(exynos->vdd33);
 160         if (ret) {
 161                 dev_err(dev, "Failed to enable VDD33 supply\n");
 162                 goto vdd33_err;
 163         }
 164
 165         exynos->vdd10 = devm_regulator_get(dev, "vdd10");
 166         if (IS_ERR(exynos->vdd10)) {
 167                 ret = PTR_ERR(exynos->vdd10);
 168                 goto vdd10_err;
 169         }
 170         ret = regulator_enable(exynos->vdd10);
 171         if (ret) {
 172                 dev_err(dev, "Failed to enable VDD10 supply\n");
 173                 goto vdd10_err;
 174         }
 175
 176         ret = dwc3_exynos_register_phys(exynos);
 177         if (ret) {
 178                 dev_err(dev, "couldn't register PHYs\n");
 179                 goto phys_err;
 180         }
 181
 182         if (node) {
 183                 ret = of_platform_populate(node, NULL, NULL, dev);
 184                 if (ret) {
 185                         dev_err(dev, "failed to add dwc3 core\n");
 186                         goto populate_err;
 187                 }
 188         } else {
 189                 dev_err(dev, "no device node, failed to add dwc3 core\n");
 190                 ret = -ENODEV;
 191                 goto populate_err;
 192         }
 193
 194         return 0;
 195
 196 populate_err:
 197         platform_device_unregister(exynos->usb2_phy);
 198         platform_device_unregister(exynos->usb3_phy);
 199 phys_err:
 200         regulator_disable(exynos->vdd10);
 201 vdd10_err:
 202         regulator_disable(exynos->vdd33);
 203 vdd33_err:
 204         clk_disable_unprepare(exynos->axius_clk);
 205 axius_clk_err:
 206         clk_disable_unprepare(exynos->susp_clk);
 207 susp_clk_err:
 208         clk_disable_unprepare(exynos->clk);
 209         return ret;
 210 }
 211
 212 static int dwc3_exynos_remove(struct platform_device *pdev)
 213 {
 214         struct dwc3_exynos      *exynos = platform_get_drvdata(pdev);
 215
 216         device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
 217         platform_device_unregister(exynos->usb2_phy);
 218         platform_device_unregister(exynos->usb3_phy);
 219
 220         clk_disable_unprepare(exynos->axius_clk);
 221         clk_disable_unprepare(exynos->susp_clk);
 222         clk_disable_unprepare(exynos->clk);
 223
 224         regulator_disable(exynos->vdd33);
 225         regulator_disable(exynos->vdd10);
 226
 227         return 0;
 228 }
 229
 230 static const struct of_device_id exynos_dwc3_match[] = {
 231         { .compatible = "samsung,exynos5250-dwusb3" },
 232         { .compatible = "samsung,exynos7-dwusb3" },
 233         {},
 234 };
 235 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
 236
 237 #ifdef CONFIG_PM_SLEEP
 238 static int dwc3_exynos_suspend(struct device *dev)
 239 {
 240         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
 241
 242         clk_disable(exynos->axius_clk);
 243         clk_disable(exynos->clk);
 244
 245         regulator_disable(exynos->vdd33);
 246         regulator_disable(exynos->vdd10);
 247
 248         return 0;
 249 }
 250
 251 static int dwc3_exynos_resume(struct device *dev)
 252 {
 253         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
 254         int ret;
 255
 256         ret = regulator_enable(exynos->vdd33);
 257         if (ret) {
 258                 dev_err(dev, "Failed to enable VDD33 supply\n");
 259                 return ret;
 260         }
 261         ret = regulator_enable(exynos->vdd10);
 262         if (ret) {
 263                 dev_err(dev, "Failed to enable VDD10 supply\n");
 264                 return ret;
 265         }
 266
 267         clk_enable(exynos->clk);
 268         clk_enable(exynos->axius_clk);
 269
 270         /* runtime set active to reflect active state. */
 271         pm_runtime_disable(dev);
 272         pm_runtime_set_active(dev);
 273         pm_runtime_enable(dev);
 274
 275         return 0;
 276 }
 277
 278 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
 279         SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
 280 };
 281
 282 #define DEV_PM_OPS      (&dwc3_exynos_dev_pm_ops)
 283 #else
 284 #define DEV_PM_OPS      NULL
 285 #endif /* CONFIG_PM_SLEEP */
 286
 287 static struct platform_driver dwc3_exynos_driver = {
 288         .probe          = dwc3_exynos_probe,
 289         .remove         = dwc3_exynos_remove,
 290         .driver         = {
 291                 .name   = "exynos-dwc3",
 292                 .of_match_table = exynos_dwc3_match,
 293                 .pm     = DEV_PM_OPS,
 294         },
 295 };
 296
 297 module_platform_driver(dwc3_exynos_driver);
 298
 299 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
 300 MODULE_LICENSE("GPL v2");
 301 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");