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
  11 #include <linux/module.h>
  12 #include <linux/kernel.h>
  13 #include <linux/slab.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/clk.h>
  16 #include <linux/usb/otg.h>
  17 #include <linux/usb/usb_phy_generic.h>
  18 #include <linux/of.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/regulator/consumer.h>
  21
  22 struct dwc3_exynos {
  23         struct platform_device  *usb2_phy;
  24         struct platform_device  *usb3_phy;
  25         struct device           *dev;
  26
  27         struct clk              *clk;
  28         struct clk              *susp_clk;
  29         struct clk              *axius_clk;
  30
  31         struct regulator        *vdd33;
  32         struct regulator        *vdd10;
  33 };
  34
  35 static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
  36 {
  37         struct usb_phy_generic_platform_data pdata;
  38         struct platform_device  *pdev;
  39         int                     ret;
  40
  41         memset(&pdata, 0x00, sizeof(pdata));
  42
  43         pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
  44         if (!pdev)
  45                 return -ENOMEM;
  46
  47         exynos->usb2_phy = pdev;
  48         pdata.type = USB_PHY_TYPE_USB2;
  49         pdata.gpio_reset = -1;
  50
  51         ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
  52         if (ret)
  53                 goto err1;
  54
  55         pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
  56         if (!pdev) {
  57                 ret = -ENOMEM;
  58                 goto err1;
  59         }
  60
  61         exynos->usb3_phy = pdev;
  62         pdata.type = USB_PHY_TYPE_USB3;
  63
  64         ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
  65         if (ret)
  66                 goto err2;
  67
  68         ret = platform_device_add(exynos->usb2_phy);
  69         if (ret)
  70                 goto err2;
  71
  72         ret = platform_device_add(exynos->usb3_phy);
  73         if (ret)
  74                 goto err3;
  75
  76         return 0;
  77
  78 err3:
  79         platform_device_del(exynos->usb2_phy);
  80
  81 err2:
  82         platform_device_put(exynos->usb3_phy);
  83
  84 err1:
  85         platform_device_put(exynos->usb2_phy);
  86
  87         return ret;
  88 }
  89
  90 static int dwc3_exynos_remove_child(struct device *dev, void *unused)
  91 {
  92         struct platform_device *pdev = to_platform_device(dev);
  93
  94         platform_device_unregister(pdev);
  95
  96         return 0;
  97 }
  98
  99 static int dwc3_exynos_probe(struct platform_device *pdev)
 100 {
 101         struct dwc3_exynos      *exynos;
 102         struct device           *dev = &pdev->dev;
 103         struct device_node      *node = dev->of_node;
 104
 105         int                     ret;
 106
 107         exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
 108         if (!exynos)
 109                 return -ENOMEM;
 110
 111         platform_set_drvdata(pdev, exynos);
 112
 113         exynos->dev     = dev;
 114
 115         exynos->clk = devm_clk_get(dev, "usbdrd30");
 116         if (IS_ERR(exynos->clk)) {
 117                 dev_err(dev, "couldn't get clock\n");
 118                 return -EINVAL;
 119         }
 120         ret = clk_prepare_enable(exynos->clk);
 121         if (ret)
 122                 return ret;
 123
 124         exynos->susp_clk = devm_clk_get(dev, "usbdrd30_susp_clk");
 125         if (IS_ERR(exynos->susp_clk))
 126                 exynos->susp_clk = NULL;
 127         ret = clk_prepare_enable(exynos->susp_clk);
 128         if (ret)
 129                 goto susp_clk_err;
 130
 131         if (of_device_is_compatible(node, "samsung,exynos7-dwusb3")) {
 132                 exynos->axius_clk = devm_clk_get(dev, "usbdrd30_axius_clk");
 133                 if (IS_ERR(exynos->axius_clk)) {
 134                         dev_err(dev, "no AXI UpScaler clk specified\n");
 135                         ret = -ENODEV;
 136                         goto axius_clk_err;
 137                 }
 138                 ret = clk_prepare_enable(exynos->axius_clk);
 139                 if (ret)
 140                         goto axius_clk_err;
 141         } else {
 142                 exynos->axius_clk = NULL;
 143         }
 144
 145         exynos->vdd33 = devm_regulator_get(dev, "vdd33");
 146         if (IS_ERR(exynos->vdd33)) {
 147                 ret = PTR_ERR(exynos->vdd33);
 148                 goto vdd33_err;
 149         }
 150         ret = regulator_enable(exynos->vdd33);
 151         if (ret) {
 152                 dev_err(dev, "Failed to enable VDD33 supply\n");
 153                 goto vdd33_err;
 154         }
 155
 156         exynos->vdd10 = devm_regulator_get(dev, "vdd10");
 157         if (IS_ERR(exynos->vdd10)) {
 158                 ret = PTR_ERR(exynos->vdd10);
 159                 goto vdd10_err;
 160         }
 161         ret = regulator_enable(exynos->vdd10);
 162         if (ret) {
 163                 dev_err(dev, "Failed to enable VDD10 supply\n");
 164                 goto vdd10_err;
 165         }
 166
 167         ret = dwc3_exynos_register_phys(exynos);
 168         if (ret) {
 169                 dev_err(dev, "couldn't register PHYs\n");
 170                 goto phys_err;
 171         }
 172
 173         if (node) {
 174                 ret = of_platform_populate(node, NULL, NULL, dev);
 175                 if (ret) {
 176                         dev_err(dev, "failed to add dwc3 core\n");
 177                         goto populate_err;
 178                 }
 179         } else {
 180                 dev_err(dev, "no device node, failed to add dwc3 core\n");
 181                 ret = -ENODEV;
 182                 goto populate_err;
 183         }
 184
 185         return 0;
 186
 187 populate_err:
 188         platform_device_unregister(exynos->usb2_phy);
 189         platform_device_unregister(exynos->usb3_phy);
 190 phys_err:
 191         regulator_disable(exynos->vdd10);
 192 vdd10_err:
 193         regulator_disable(exynos->vdd33);
 194 vdd33_err:
 195         clk_disable_unprepare(exynos->axius_clk);
 196 axius_clk_err:
 197         clk_disable_unprepare(exynos->susp_clk);
 198 susp_clk_err:
 199         clk_disable_unprepare(exynos->clk);
 200         return ret;
 201 }
 202
 203 static int dwc3_exynos_remove(struct platform_device *pdev)
 204 {
 205         struct dwc3_exynos      *exynos = platform_get_drvdata(pdev);
 206
 207         device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
 208         platform_device_unregister(exynos->usb2_phy);
 209         platform_device_unregister(exynos->usb3_phy);
 210
 211         clk_disable_unprepare(exynos->axius_clk);
 212         clk_disable_unprepare(exynos->susp_clk);
 213         clk_disable_unprepare(exynos->clk);
 214
 215         regulator_disable(exynos->vdd33);
 216         regulator_disable(exynos->vdd10);
 217
 218         return 0;
 219 }
 220
 221 static const struct of_device_id exynos_dwc3_match[] = {
 222         { .compatible = "samsung,exynos5250-dwusb3" },
 223         { .compatible = "samsung,exynos7-dwusb3" },
 224         {},
 225 };
 226 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
 227
 228 #ifdef CONFIG_PM_SLEEP
 229 static int dwc3_exynos_suspend(struct device *dev)
 230 {
 231         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
 232
 233         clk_disable(exynos->axius_clk);
 234         clk_disable(exynos->clk);
 235
 236         regulator_disable(exynos->vdd33);
 237         regulator_disable(exynos->vdd10);
 238
 239         return 0;
 240 }
 241
 242 static int dwc3_exynos_resume(struct device *dev)
 243 {
 244         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
 245         int ret;
 246
 247         ret = regulator_enable(exynos->vdd33);
 248         if (ret) {
 249                 dev_err(dev, "Failed to enable VDD33 supply\n");
 250                 return ret;
 251         }
 252         ret = regulator_enable(exynos->vdd10);
 253         if (ret) {
 254                 dev_err(dev, "Failed to enable VDD10 supply\n");
 255                 return ret;
 256         }
 257
 258         clk_enable(exynos->clk);
 259         clk_enable(exynos->axius_clk);
 260
 261         /* runtime set active to reflect active state. */
 262         pm_runtime_disable(dev);
 263         pm_runtime_set_active(dev);
 264         pm_runtime_enable(dev);
 265
 266         return 0;
 267 }
 268
 269 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
 270         SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
 271 };
 272
 273 #define DEV_PM_OPS      (&dwc3_exynos_dev_pm_ops)
 274 #else
 275 #define DEV_PM_OPS      NULL
 276 #endif /* CONFIG_PM_SLEEP */
 277
 278 static struct platform_driver dwc3_exynos_driver = {
 279         .probe          = dwc3_exynos_probe,
 280         .remove         = dwc3_exynos_remove,
 281         .driver         = {
 282                 .name   = "exynos-dwc3",
 283                 .of_match_table = exynos_dwc3_match,
 284                 .pm     = DEV_PM_OPS,
 285         },
 286 };
 287
 288 module_platform_driver(dwc3_exynos_driver);
 289
 290 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
 291 MODULE_LICENSE("GPL v2");
 292 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");