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 <av.tikhomirov@samsung.com>
   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/platform_data/dwc3-exynos.h>
  24 #include <linux/dma-mapping.h>
  25 #include <linux/clk.h>
  26 #include <linux/usb/otg.h>
  27 #include <linux/usb/usb_phy_generic.h>
  28 #include <linux/of.h>
  29 #include <linux/of_platform.h>
  30 #include <linux/regulator/consumer.h>
  31
  32 struct dwc3_exynos {
  33         struct platform_device  *usb2_phy;
  34         struct platform_device  *usb3_phy;
  35         struct device           *dev;
  36
  37         struct clk              *clk;
  38         struct regulator        *vdd33;
  39         struct regulator        *vdd10;
  40 };
  41
  42 static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
  43 {
  44         struct usb_phy_generic_platform_data pdata;
  45         struct platform_device  *pdev;
  46         int                     ret;
  47
  48         memset(&pdata, 0x00, sizeof(pdata));
  49
  50         pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
  51         if (!pdev)
  52                 return -ENOMEM;
  53
  54         exynos->usb2_phy = pdev;
  55         pdata.type = USB_PHY_TYPE_USB2;
  56         pdata.gpio_reset = -1;
  57
  58         ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
  59         if (ret)
  60                 goto err1;
  61
  62         pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
  63         if (!pdev) {
  64                 ret = -ENOMEM;
  65                 goto err1;
  66         }
  67
  68         exynos->usb3_phy = pdev;
  69         pdata.type = USB_PHY_TYPE_USB3;
  70
  71         ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
  72         if (ret)
  73                 goto err2;
  74
  75         ret = platform_device_add(exynos->usb2_phy);
  76         if (ret)
  77                 goto err2;
  78
  79         ret = platform_device_add(exynos->usb3_phy);
  80         if (ret)
  81                 goto err3;
  82
  83         return 0;
  84
  85 err3:
  86         platform_device_del(exynos->usb2_phy);
  87
  88 err2:
  89         platform_device_put(exynos->usb3_phy);
  90
  91 err1:
  92         platform_device_put(exynos->usb2_phy);
  93
  94         return ret;
  95 }
  96
  97 static int dwc3_exynos_remove_child(struct device *dev, void *unused)
  98 {
  99         struct platform_device *pdev = to_platform_device(dev);
 100
 101         platform_device_unregister(pdev);
 102
 103         return 0;
 104 }
 105
 106 static int dwc3_exynos_probe(struct platform_device *pdev)
 107 {
 108         struct dwc3_exynos      *exynos;
 109         struct clk              *clk;
 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         /*
 120          * Right now device-tree probed devices don't get dma_mask set.
 121          * Since shared usb code relies on it, set it here for now.
 122          * Once we move to full device tree support this will vanish off.
 123          */
 124         ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
 125         if (ret)
 126                 return ret;
 127
 128         platform_set_drvdata(pdev, exynos);
 129
 130         ret = dwc3_exynos_register_phys(exynos);
 131         if (ret) {
 132                 dev_err(dev, "couldn't register PHYs\n");
 133                 return ret;
 134         }
 135
 136         clk = devm_clk_get(dev, "usbdrd30");
 137         if (IS_ERR(clk)) {
 138                 dev_err(dev, "couldn't get clock\n");
 139                 return -EINVAL;
 140         }
 141
 142         exynos->dev     = dev;
 143         exynos->clk     = clk;
 144
 145         clk_prepare_enable(exynos->clk);
 146
 147         exynos->vdd33 = devm_regulator_get(dev, "vdd33");
 148         if (IS_ERR(exynos->vdd33)) {
 149                 ret = PTR_ERR(exynos->vdd33);
 150                 goto err2;
 151         }
 152         ret = regulator_enable(exynos->vdd33);
 153         if (ret) {
 154                 dev_err(dev, "Failed to enable VDD33 supply\n");
 155                 goto err2;
 156         }
 157
 158         exynos->vdd10 = devm_regulator_get(dev, "vdd10");
 159         if (IS_ERR(exynos->vdd10)) {
 160                 ret = PTR_ERR(exynos->vdd10);
 161                 goto err3;
 162         }
 163         ret = regulator_enable(exynos->vdd10);
 164         if (ret) {
 165                 dev_err(dev, "Failed to enable VDD10 supply\n");
 166                 goto err3;
 167         }
 168
 169         if (node) {
 170                 ret = of_platform_populate(node, NULL, NULL, dev);
 171                 if (ret) {
 172                         dev_err(dev, "failed to add dwc3 core\n");
 173                         goto err4;
 174                 }
 175         } else {
 176                 dev_err(dev, "no device node, failed to add dwc3 core\n");
 177                 ret = -ENODEV;
 178                 goto err4;
 179         }
 180
 181         return 0;
 182
 183 err4:
 184         regulator_disable(exynos->vdd10);
 185 err3:
 186         regulator_disable(exynos->vdd33);
 187 err2:
 188         clk_disable_unprepare(clk);
 189         return ret;
 190 }
 191
 192 static int dwc3_exynos_remove(struct platform_device *pdev)
 193 {
 194         struct dwc3_exynos      *exynos = platform_get_drvdata(pdev);
 195
 196         device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
 197         platform_device_unregister(exynos->usb2_phy);
 198         platform_device_unregister(exynos->usb3_phy);
 199
 200         clk_disable_unprepare(exynos->clk);
 201
 202         regulator_disable(exynos->vdd33);
 203         regulator_disable(exynos->vdd10);
 204
 205         return 0;
 206 }
 207
 208 #ifdef CONFIG_OF
 209 static const struct of_device_id exynos_dwc3_match[] = {
 210         { .compatible = "samsung,exynos5250-dwusb3" },
 211         {},
 212 };
 213 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
 214 #endif
 215
 216 #ifdef CONFIG_PM_SLEEP
 217 static int dwc3_exynos_suspend(struct device *dev)
 218 {
 219         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
 220
 221         clk_disable(exynos->clk);
 222
 223         regulator_disable(exynos->vdd33);
 224         regulator_disable(exynos->vdd10);
 225
 226         return 0;
 227 }
 228
 229 static int dwc3_exynos_resume(struct device *dev)
 230 {
 231         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
 232         int ret;
 233
 234         ret = regulator_enable(exynos->vdd33);
 235         if (ret) {
 236                 dev_err(dev, "Failed to enable VDD33 supply\n");
 237                 return ret;
 238         }
 239         ret = regulator_enable(exynos->vdd10);
 240         if (ret) {
 241                 dev_err(dev, "Failed to enable VDD10 supply\n");
 242                 return ret;
 243         }
 244
 245         clk_enable(exynos->clk);
 246
 247         /* runtime set active to reflect active state. */
 248         pm_runtime_disable(dev);
 249         pm_runtime_set_active(dev);
 250         pm_runtime_enable(dev);
 251
 252         return 0;
 253 }
 254
 255 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
 256         SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
 257 };
 258
 259 #define DEV_PM_OPS      (&dwc3_exynos_dev_pm_ops)
 260 #else
 261 #define DEV_PM_OPS      NULL
 262 #endif /* CONFIG_PM_SLEEP */
 263
 264 static struct platform_driver dwc3_exynos_driver = {
 265         .probe          = dwc3_exynos_probe,
 266         .remove         = dwc3_exynos_remove,
 267         .driver         = {
 268                 .name   = "exynos-dwc3",
 269                 .of_match_table = of_match_ptr(exynos_dwc3_match),
 270                 .pm     = DEV_PM_OPS,
 271         },
 272 };
 273
 274 module_platform_driver(dwc3_exynos_driver);
 275
 276 MODULE_ALIAS("platform:exynos-dwc3");
 277 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
 278 MODULE_LICENSE("GPL v2");
 279 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");