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