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 clk              *susp_clk;
  38         struct clk              *axius_clk;
  39
  40         struct regulator        *vdd33;
  41         struct regulator        *vdd10;
  42 };
  43
  44 static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
  45 {
  46         struct usb_phy_generic_platform_data pdata;
  47         struct platform_device  *pdev;
  48         int                     ret;
  49
  50         memset(&pdata, 0x00, sizeof(pdata));
  51
  52         pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
  53         if (!pdev)
  54                 return -ENOMEM;
  55
  56         exynos->usb2_phy = pdev;
  57         pdata.type = USB_PHY_TYPE_USB2;
  58         pdata.gpio_reset = -1;
  59
  60         ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
  61         if (ret)
  62                 goto err1;
  63
  64         pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
  65         if (!pdev) {
  66                 ret = -ENOMEM;
  67                 goto err1;
  68         }
  69
  70         exynos->usb3_phy = pdev;
  71         pdata.type = USB_PHY_TYPE_USB3;
  72
  73         ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
  74         if (ret)
  75                 goto err2;
  76
  77         ret = platform_device_add(exynos->usb2_phy);
  78         if (ret)
  79                 goto err2;
  80
  81         ret = platform_device_add(exynos->usb3_phy);
  82         if (ret)
  83                 goto err3;
  84
  85         return 0;
  86
  87 err3:
  88         platform_device_del(exynos->usb2_phy);
  89
  90 err2:
  91         platform_device_put(exynos->usb3_phy);
  92
  93 err1:
  94         platform_device_put(exynos->usb2_phy);
  95
  96         return ret;
  97 }
  98
  99 static int dwc3_exynos_remove_child(struct device *dev, void *unused)
 100 {
 101         struct platform_device *pdev = to_platform_device(dev);
 102
 103         platform_device_unregister(pdev);
 104
 105         return 0;
 106 }
 107
 108 static int dwc3_exynos_probe(struct platform_device *pdev)
 109 {
 110         struct dwc3_exynos      *exynos;
 111         struct device           *dev = &pdev->dev;
 112         struct device_node      *node = dev->of_node;
 113
 114         int                     ret;
 115
 116         exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
 117         if (!exynos)
 118                 return -ENOMEM;
 119
 120         /*
 121          * Right now device-tree probed devices don't get dma_mask set.
 122          * Since shared usb code relies on it, set it here for now.
 123          * Once we move to full device tree support this will vanish off.
 124          */
 125         ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
 126         if (ret)
 127                 return ret;
 128
 129         platform_set_drvdata(pdev, exynos);
 130
 131         exynos->dev     = dev;
 132
 133         exynos->clk = devm_clk_get(dev, "usbdrd30");
 134         if (IS_ERR(exynos->clk)) {
 135                 dev_err(dev, "couldn't get clock\n");
 136                 return -EINVAL;
 137         }
 138         clk_prepare_enable(exynos->clk);
 139
 140         exynos->susp_clk = devm_clk_get(dev, "usbdrd30_susp_clk");
 141         if (IS_ERR(exynos->susp_clk)) {
 142                 dev_dbg(dev, "no suspend clk specified\n");
 143                 exynos->susp_clk = NULL;
 144         }
 145         clk_prepare_enable(exynos->susp_clk);
 146
 147         if (of_device_is_compatible(node, "samsung,exynos7-dwusb3")) {
 148                 exynos->axius_clk = devm_clk_get(dev, "usbdrd30_axius_clk");
 149                 if (IS_ERR(exynos->axius_clk)) {
 150                         dev_err(dev, "no AXI UpScaler clk specified\n");
 151                         ret = -ENODEV;
 152                         goto axius_clk_err;
 153                 }
 154                 clk_prepare_enable(exynos->axius_clk);
 155         } else {
 156                 exynos->axius_clk = NULL;
 157         }
 158
 159         exynos->vdd33 = devm_regulator_get(dev, "vdd33");
 160         if (IS_ERR(exynos->vdd33)) {
 161                 ret = PTR_ERR(exynos->vdd33);
 162                 goto err2;
 163         }
 164         ret = regulator_enable(exynos->vdd33);
 165         if (ret) {
 166                 dev_err(dev, "Failed to enable VDD33 supply\n");
 167                 goto err2;
 168         }
 169
 170         exynos->vdd10 = devm_regulator_get(dev, "vdd10");
 171         if (IS_ERR(exynos->vdd10)) {
 172                 ret = PTR_ERR(exynos->vdd10);
 173                 goto err3;
 174         }
 175         ret = regulator_enable(exynos->vdd10);
 176         if (ret) {
 177                 dev_err(dev, "Failed to enable VDD10 supply\n");
 178                 goto err3;
 179         }
 180
 181         ret = dwc3_exynos_register_phys(exynos);
 182         if (ret) {
 183                 dev_err(dev, "couldn't register PHYs\n");
 184                 goto err4;
 185         }
 186
 187         if (node) {
 188                 ret = of_platform_populate(node, NULL, NULL, dev);
 189                 if (ret) {
 190                         dev_err(dev, "failed to add dwc3 core\n");
 191                         goto err5;
 192                 }
 193         } else {
 194                 dev_err(dev, "no device node, failed to add dwc3 core\n");
 195                 ret = -ENODEV;
 196                 goto err5;
 197         }
 198
 199         return 0;
 200
 201 err5:
 202         platform_device_unregister(exynos->usb2_phy);
 203         platform_device_unregister(exynos->usb3_phy);
 204 err4:
 205         regulator_disable(exynos->vdd10);
 206 err3:
 207         regulator_disable(exynos->vdd33);
 208 err2:
 209         clk_disable_unprepare(exynos->axius_clk);
 210 axius_clk_err:
 211         clk_disable_unprepare(exynos->susp_clk);
 212         clk_disable_unprepare(exynos->clk);
 213         return ret;
 214 }
 215
 216 static int dwc3_exynos_remove(struct platform_device *pdev)
 217 {
 218         struct dwc3_exynos      *exynos = platform_get_drvdata(pdev);
 219
 220         device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
 221         platform_device_unregister(exynos->usb2_phy);
 222         platform_device_unregister(exynos->usb3_phy);
 223
 224         clk_disable_unprepare(exynos->axius_clk);
 225         clk_disable_unprepare(exynos->susp_clk);
 226         clk_disable_unprepare(exynos->clk);
 227
 228         regulator_disable(exynos->vdd33);
 229         regulator_disable(exynos->vdd10);
 230
 231         return 0;
 232 }
 233
 234 static const struct of_device_id exynos_dwc3_match[] = {
 235         { .compatible = "samsung,exynos5250-dwusb3" },
 236         { .compatible = "samsung,exynos7-dwusb3" },
 237         {},
 238 };
 239 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
 240
 241 #ifdef CONFIG_PM_SLEEP
 242 static int dwc3_exynos_suspend(struct device *dev)
 243 {
 244         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
 245
 246         clk_disable(exynos->axius_clk);
 247         clk_disable(exynos->clk);
 248
 249         regulator_disable(exynos->vdd33);
 250         regulator_disable(exynos->vdd10);
 251
 252         return 0;
 253 }
 254
 255 static int dwc3_exynos_resume(struct device *dev)
 256 {
 257         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
 258         int ret;
 259
 260         ret = regulator_enable(exynos->vdd33);
 261         if (ret) {
 262                 dev_err(dev, "Failed to enable VDD33 supply\n");
 263                 return ret;
 264         }
 265         ret = regulator_enable(exynos->vdd10);
 266         if (ret) {
 267                 dev_err(dev, "Failed to enable VDD10 supply\n");
 268                 return ret;
 269         }
 270
 271         clk_enable(exynos->clk);
 272         clk_enable(exynos->axius_clk);
 273
 274         /* runtime set active to reflect active state. */
 275         pm_runtime_disable(dev);
 276         pm_runtime_set_active(dev);
 277         pm_runtime_enable(dev);
 278
 279         return 0;
 280 }
 281
 282 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
 283         SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
 284 };
 285
 286 #define DEV_PM_OPS      (&dwc3_exynos_dev_pm_ops)
 287 #else
 288 #define DEV_PM_OPS      NULL
 289 #endif /* CONFIG_PM_SLEEP */
 290
 291 static struct platform_driver dwc3_exynos_driver = {
 292         .probe          = dwc3_exynos_probe,
 293         .remove         = dwc3_exynos_remove,
 294         .driver         = {
 295                 .name   = "exynos-dwc3",
 296                 .of_match_table = exynos_dwc3_match,
 297                 .pm     = DEV_PM_OPS,
 298         },
 299 };
 300
 301 module_platform_driver(dwc3_exynos_driver);
 302
 303 MODULE_ALIAS("platform:exynos-dwc3");
 304 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
 305 MODULE_LICENSE("GPL v2");
 306 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");