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/dma-mapping.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 regulator        *vdd33;
  38         struct regulator        *vdd10;
  39 };
  40
  41 static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
  42 {
  43         struct usb_phy_generic_platform_data pdata;
  44         struct platform_device  *pdev;
  45         int                     ret;
  46
  47         memset(&pdata, 0x00, sizeof(pdata));
  48
  49         pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
  50         if (!pdev)
  51                 return -ENOMEM;
  52
  53         exynos->usb2_phy = pdev;
  54         pdata.type = USB_PHY_TYPE_USB2;
  55         pdata.gpio_reset = -1;
  56
  57         ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
  58         if (ret)
  59                 goto err1;
  60
  61         pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
  62         if (!pdev) {
  63                 ret = -ENOMEM;
  64                 goto err1;
  65         }
  66
  67         exynos->usb3_phy = pdev;
  68         pdata.type = USB_PHY_TYPE_USB3;
  69
  70         ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
  71         if (ret)
  72                 goto err2;
  73
  74         ret = platform_device_add(exynos->usb2_phy);
  75         if (ret)
  76                 goto err2;
  77
  78         ret = platform_device_add(exynos->usb3_phy);
  79         if (ret)
  80                 goto err3;
  81
  82         return 0;
  83
  84 err3:
  85         platform_device_del(exynos->usb2_phy);
  86
  87 err2:
  88         platform_device_put(exynos->usb3_phy);
  89
  90 err1:
  91         platform_device_put(exynos->usb2_phy);
  92
  93         return ret;
  94 }
  95
  96 static int dwc3_exynos_remove_child(struct device *dev, void *unused)
  97 {
  98         struct platform_device *pdev = to_platform_device(dev);
  99
 100         platform_device_unregister(pdev);
 101
 102         return 0;
 103 }
 104
 105 static int dwc3_exynos_probe(struct platform_device *pdev)
 106 {
 107         struct dwc3_exynos      *exynos;
 108         struct device           *dev = &pdev->dev;
 109         struct device_node      *node = dev->of_node;
 110
 111         int                     ret;
 112
 113         exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
 114         if (!exynos)
 115                 return -ENOMEM;
 116
 117         /*
 118          * Right now device-tree probed devices don't get dma_mask set.
 119          * Since shared usb code relies on it, set it here for now.
 120          * Once we move to full device tree support this will vanish off.
 121          */
 122         ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
 123         if (ret)
 124                 return ret;
 125
 126         platform_set_drvdata(pdev, exynos);
 127
 128         ret = dwc3_exynos_register_phys(exynos);
 129         if (ret) {
 130                 dev_err(dev, "couldn't register PHYs\n");
 131                 return ret;
 132         }
 133
 134         exynos->dev     = dev;
 135
 136         exynos->clk = devm_clk_get(dev, "usbdrd30");
 137         if (IS_ERR(exynos->clk)) {
 138                 dev_err(dev, "couldn't get clock\n");
 139                 return -EINVAL;
 140         }
 141         clk_prepare_enable(exynos->clk);
 142
 143         exynos->vdd33 = devm_regulator_get(dev, "vdd33");
 144         if (IS_ERR(exynos->vdd33)) {
 145                 ret = PTR_ERR(exynos->vdd33);
 146                 goto err2;
 147         }
 148         ret = regulator_enable(exynos->vdd33);
 149         if (ret) {
 150                 dev_err(dev, "Failed to enable VDD33 supply\n");
 151                 goto err2;
 152         }
 153
 154         exynos->vdd10 = devm_regulator_get(dev, "vdd10");
 155         if (IS_ERR(exynos->vdd10)) {
 156                 ret = PTR_ERR(exynos->vdd10);
 157                 goto err3;
 158         }
 159         ret = regulator_enable(exynos->vdd10);
 160         if (ret) {
 161                 dev_err(dev, "Failed to enable VDD10 supply\n");
 162                 goto err3;
 163         }
 164
 165         if (node) {
 166                 ret = of_platform_populate(node, NULL, NULL, dev);
 167                 if (ret) {
 168                         dev_err(dev, "failed to add dwc3 core\n");
 169                         goto err4;
 170                 }
 171         } else {
 172                 dev_err(dev, "no device node, failed to add dwc3 core\n");
 173                 ret = -ENODEV;
 174                 goto err4;
 175         }
 176
 177         return 0;
 178
 179 err4:
 180         regulator_disable(exynos->vdd10);
 181 err3:
 182         regulator_disable(exynos->vdd33);
 183 err2:
 184         clk_disable_unprepare(exynos->clk);
 185         return ret;
 186 }
 187
 188 static int dwc3_exynos_remove(struct platform_device *pdev)
 189 {
 190         struct dwc3_exynos      *exynos = platform_get_drvdata(pdev);
 191
 192         device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
 193         platform_device_unregister(exynos->usb2_phy);
 194         platform_device_unregister(exynos->usb3_phy);
 195
 196         clk_disable_unprepare(exynos->clk);
 197
 198         regulator_disable(exynos->vdd33);
 199         regulator_disable(exynos->vdd10);
 200
 201         return 0;
 202 }
 203
 204 static const struct of_device_id exynos_dwc3_match[] = {
 205         { .compatible = "samsung,exynos5250-dwusb3" },
 206         {},
 207 };
 208 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
 209
 210 #ifdef CONFIG_PM_SLEEP
 211 static int dwc3_exynos_suspend(struct device *dev)
 212 {
 213         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
 214
 215         clk_disable(exynos->clk);
 216
 217         regulator_disable(exynos->vdd33);
 218         regulator_disable(exynos->vdd10);
 219
 220         return 0;
 221 }
 222
 223 static int dwc3_exynos_resume(struct device *dev)
 224 {
 225         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
 226         int ret;
 227
 228         ret = regulator_enable(exynos->vdd33);
 229         if (ret) {
 230                 dev_err(dev, "Failed to enable VDD33 supply\n");
 231                 return ret;
 232         }
 233         ret = regulator_enable(exynos->vdd10);
 234         if (ret) {
 235                 dev_err(dev, "Failed to enable VDD10 supply\n");
 236                 return ret;
 237         }
 238
 239         clk_enable(exynos->clk);
 240
 241         /* runtime set active to reflect active state. */
 242         pm_runtime_disable(dev);
 243         pm_runtime_set_active(dev);
 244         pm_runtime_enable(dev);
 245
 246         return 0;
 247 }
 248
 249 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
 250         SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
 251 };
 252
 253 #define DEV_PM_OPS      (&dwc3_exynos_dev_pm_ops)
 254 #else
 255 #define DEV_PM_OPS      NULL
 256 #endif /* CONFIG_PM_SLEEP */
 257
 258 static struct platform_driver dwc3_exynos_driver = {
 259         .probe          = dwc3_exynos_probe,
 260         .remove         = dwc3_exynos_remove,
 261         .driver         = {
 262                 .name   = "exynos-dwc3",
 263                 .of_match_table = exynos_dwc3_match,
 264                 .pm     = DEV_PM_OPS,
 265         },
 266 };
 267
 268 module_platform_driver(dwc3_exynos_driver);
 269
 270 MODULE_ALIAS("platform:exynos-dwc3");
 271 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
 272 MODULE_LICENSE("GPL v2");
 273 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");