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 as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/slab.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/platform_data/dwc3-exynos.h>
  20 #include <linux/dma-mapping.h>
  21 #include <linux/clk.h>
  22 #include <linux/usb/otg.h>
  23 #include <linux/usb/nop-usb-xceiv.h>
  24 #include <linux/of.h>
  25 #include <linux/of_platform.h>
  26
  27 struct dwc3_exynos {
  28         struct platform_device  *usb2_phy;
  29         struct platform_device  *usb3_phy;
  30         struct device           *dev;
  31
  32         struct clk              *clk;
  33 };
  34
  35 static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
  36 {
  37         struct nop_usb_xceiv_platform_data pdata;
  38         struct platform_device  *pdev;
  39         int                     ret;
  40
  41         memset(&pdata, 0x00, sizeof(pdata));
  42
  43         pdev = platform_device_alloc("nop_usb_xceiv", PLATFORM_DEVID_AUTO);
  44         if (!pdev)
  45                 return -ENOMEM;
  46
  47         exynos->usb2_phy = pdev;
  48         pdata.type = USB_PHY_TYPE_USB2;
  49
  50         ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
  51         if (ret)
  52                 goto err1;
  53
  54         pdev = platform_device_alloc("nop_usb_xceiv", PLATFORM_DEVID_AUTO);
  55         if (!pdev) {
  56                 ret = -ENOMEM;
  57                 goto err1;
  58         }
  59
  60         exynos->usb3_phy = pdev;
  61         pdata.type = USB_PHY_TYPE_USB3;
  62
  63         ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
  64         if (ret)
  65                 goto err2;
  66
  67         ret = platform_device_add(exynos->usb2_phy);
  68         if (ret)
  69                 goto err2;
  70
  71         ret = platform_device_add(exynos->usb3_phy);
  72         if (ret)
  73                 goto err3;
  74
  75         return 0;
  76
  77 err3:
  78         platform_device_del(exynos->usb2_phy);
  79
  80 err2:
  81         platform_device_put(exynos->usb3_phy);
  82
  83 err1:
  84         platform_device_put(exynos->usb2_phy);
  85
  86         return ret;
  87 }
  88
  89 static int dwc3_exynos_remove_child(struct device *dev, void *unused)
  90 {
  91         struct platform_device *pdev = to_platform_device(dev);
  92
  93         platform_device_unregister(pdev);
  94
  95         return 0;
  96 }
  97
  98 static int dwc3_exynos_probe(struct platform_device *pdev)
  99 {
 100         struct dwc3_exynos      *exynos;
 101         struct clk              *clk;
 102         struct device           *dev = &pdev->dev;
 103         struct device_node      *node = dev->of_node;
 104
 105         int                     ret = -ENOMEM;
 106
 107         exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
 108         if (!exynos) {
 109                 dev_err(dev, "not enough memory\n");
 110                 goto err1;
 111         }
 112
 113         /*
 114          * Right now device-tree probed devices don't get dma_mask set.
 115          * Since shared usb code relies on it, set it here for now.
 116          * Once we move to full device tree support this will vanish off.
 117          */
 118         if (!dev->dma_mask)
 119                 dev->dma_mask = &dev->coherent_dma_mask;
 120         if (!dev->coherent_dma_mask)
 121                 dev->coherent_dma_mask = DMA_BIT_MASK(32);
 122
 123         platform_set_drvdata(pdev, exynos);
 124
 125         ret = dwc3_exynos_register_phys(exynos);
 126         if (ret) {
 127                 dev_err(dev, "couldn't register PHYs\n");
 128                 goto err1;
 129         }
 130
 131         clk = devm_clk_get(dev, "usbdrd30");
 132         if (IS_ERR(clk)) {
 133                 dev_err(dev, "couldn't get clock\n");
 134                 ret = -EINVAL;
 135                 goto err1;
 136         }
 137
 138         exynos->dev     = dev;
 139         exynos->clk     = clk;
 140
 141         clk_prepare_enable(exynos->clk);
 142
 143         if (node) {
 144                 ret = of_platform_populate(node, NULL, NULL, dev);
 145                 if (ret) {
 146                         dev_err(dev, "failed to add dwc3 core\n");
 147                         goto err2;
 148                 }
 149         } else {
 150                 dev_err(dev, "no device node, failed to add dwc3 core\n");
 151                 ret = -ENODEV;
 152                 goto err2;
 153         }
 154
 155         return 0;
 156
 157 err2:
 158         clk_disable_unprepare(clk);
 159 err1:
 160         return ret;
 161 }
 162
 163 static int dwc3_exynos_remove(struct platform_device *pdev)
 164 {
 165         struct dwc3_exynos      *exynos = platform_get_drvdata(pdev);
 166
 167         device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
 168         platform_device_unregister(exynos->usb2_phy);
 169         platform_device_unregister(exynos->usb3_phy);
 170
 171         clk_disable_unprepare(exynos->clk);
 172
 173         return 0;
 174 }
 175
 176 #ifdef CONFIG_OF
 177 static const struct of_device_id exynos_dwc3_match[] = {
 178         { .compatible = "samsung,exynos5250-dwusb3" },
 179         {},
 180 };
 181 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
 182 #endif
 183
 184 #ifdef CONFIG_PM_SLEEP
 185 static int dwc3_exynos_suspend(struct device *dev)
 186 {
 187         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
 188
 189         clk_disable(exynos->clk);
 190
 191         return 0;
 192 }
 193
 194 static int dwc3_exynos_resume(struct device *dev)
 195 {
 196         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
 197
 198         clk_enable(exynos->clk);
 199
 200         /* runtime set active to reflect active state. */
 201         pm_runtime_disable(dev);
 202         pm_runtime_set_active(dev);
 203         pm_runtime_enable(dev);
 204
 205         return 0;
 206 }
 207
 208 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
 209         SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
 210 };
 211
 212 #define DEV_PM_OPS      (&dwc3_exynos_dev_pm_ops)
 213 #else
 214 #define DEV_PM_OPS      NULL
 215 #endif /* CONFIG_PM_SLEEP */
 216
 217 static struct platform_driver dwc3_exynos_driver = {
 218         .probe          = dwc3_exynos_probe,
 219         .remove         = dwc3_exynos_remove,
 220         .driver         = {
 221                 .name   = "exynos-dwc3",
 222                 .of_match_table = of_match_ptr(exynos_dwc3_match),
 223                 .pm     = DEV_PM_OPS,
 224         },
 225 };
 226
 227 module_platform_driver(dwc3_exynos_driver);
 228
 229 MODULE_ALIAS("platform:exynos-dwc3");
 230 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
 231 MODULE_LICENSE("GPL");
 232 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");