drivers/usb/dwc3/dwc3-exynos.c

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