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                 dev_err(dev, "not enough memory\n");
 118                 return -ENOMEM;
 119         }
 120
 121         /*
 122          * Right now device-tree probed devices don't get dma_mask set.
 123          * Since shared usb code relies on it, set it here for now.
 124          * Once we move to full device tree support this will vanish off.
 125          */
 126         ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
 127         if (ret)
 128                 return ret;
 129
 130         platform_set_drvdata(pdev, exynos);
 131
 132         ret = dwc3_exynos_register_phys(exynos);
 133         if (ret) {
 134                 dev_err(dev, "couldn't register PHYs\n");
 135                 return ret;
 136         }
 137
 138         clk = devm_clk_get(dev, "usbdrd30");
 139         if (IS_ERR(clk)) {
 140                 dev_err(dev, "couldn't get clock\n");
 141                 return -EINVAL;
 142         }
 143
 144         exynos->dev     = dev;
 145         exynos->clk     = clk;
 146
 147         clk_prepare_enable(exynos->clk);
 148
 149         exynos->vdd33 = devm_regulator_get(dev, "vdd33");
 150         if (IS_ERR(exynos->vdd33)) {
 151                 ret = PTR_ERR(exynos->vdd33);
 152                 goto err2;
 153         }
 154         ret = regulator_enable(exynos->vdd33);
 155         if (ret) {
 156                 dev_err(dev, "Failed to enable VDD33 supply\n");
 157                 goto err2;
 158         }
 159
 160         exynos->vdd10 = devm_regulator_get(dev, "vdd10");
 161         if (IS_ERR(exynos->vdd10)) {
 162                 ret = PTR_ERR(exynos->vdd10);
 163                 goto err3;
 164         }
 165         ret = regulator_enable(exynos->vdd10);
 166         if (ret) {
 167                 dev_err(dev, "Failed to enable VDD10 supply\n");
 168                 goto err3;
 169         }
 170
 171         if (node) {
 172                 ret = of_platform_populate(node, NULL, NULL, dev);
 173                 if (ret) {
 174                         dev_err(dev, "failed to add dwc3 core\n");
 175                         goto err4;
 176                 }
 177         } else {
 178                 dev_err(dev, "no device node, failed to add dwc3 core\n");
 179                 ret = -ENODEV;
 180                 goto err4;
 181         }
 182
 183         return 0;
 184
 185 err4:
 186         regulator_disable(exynos->vdd10);
 187 err3:
 188         regulator_disable(exynos->vdd33);
 189 err2:
 190         clk_disable_unprepare(clk);
 191         return ret;
 192 }
 193
 194 static int dwc3_exynos_remove(struct platform_device *pdev)
 195 {
 196         struct dwc3_exynos      *exynos = platform_get_drvdata(pdev);
 197
 198         device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
 199         platform_device_unregister(exynos->usb2_phy);
 200         platform_device_unregister(exynos->usb3_phy);
 201
 202         clk_disable_unprepare(exynos->clk);
 203
 204         regulator_disable(exynos->vdd33);
 205         regulator_disable(exynos->vdd10);
 206
 207         return 0;
 208 }
 209
 210 #ifdef CONFIG_OF
 211 static const struct of_device_id exynos_dwc3_match[] = {
 212         { .compatible = "samsung,exynos5250-dwusb3" },
 213         {},
 214 };
 215 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
 216 #endif
 217
 218 #ifdef CONFIG_PM_SLEEP
 219 static int dwc3_exynos_suspend(struct device *dev)
 220 {
 221         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
 222
 223         clk_disable(exynos->clk);
 224
 225         regulator_disable(exynos->vdd33);
 226         regulator_disable(exynos->vdd10);
 227
 228         return 0;
 229 }
 230
 231 static int dwc3_exynos_resume(struct device *dev)
 232 {
 233         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
 234         int ret;
 235
 236         ret = regulator_enable(exynos->vdd33);
 237         if (ret) {
 238                 dev_err(dev, "Failed to enable VDD33 supply\n");
 239                 return ret;
 240         }
 241         ret = regulator_enable(exynos->vdd10);
 242         if (ret) {
 243                 dev_err(dev, "Failed to enable VDD10 supply\n");
 244                 return ret;
 245         }
 246
 247         clk_enable(exynos->clk);
 248
 249         /* runtime set active to reflect active state. */
 250         pm_runtime_disable(dev);
 251         pm_runtime_set_active(dev);
 252         pm_runtime_enable(dev);
 253
 254         return 0;
 255 }
 256
 257 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
 258         SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
 259 };
 260
 261 #define DEV_PM_OPS      (&dwc3_exynos_dev_pm_ops)
 262 #else
 263 #define DEV_PM_OPS      NULL
 264 #endif /* CONFIG_PM_SLEEP */
 265
 266 static struct platform_driver dwc3_exynos_driver = {
 267         .probe          = dwc3_exynos_probe,
 268         .remove         = dwc3_exynos_remove,
 269         .driver         = {
 270                 .name   = "exynos-dwc3",
 271                 .of_match_table = of_match_ptr(exynos_dwc3_match),
 272                 .pm     = DEV_PM_OPS,
 273         },
 274 };
 275
 276 module_platform_driver(dwc3_exynos_driver);
 277
 278 MODULE_ALIAS("platform:exynos-dwc3");
 279 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
 280 MODULE_LICENSE("GPL v2");
 281 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");