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_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
  54         ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
  55         if (ret)
  56                 goto err1;
  57
  58         pdev = platform_device_alloc("usb_phy_gen_xceiv", PLATFORM_DEVID_AUTO);
  59         if (!pdev) {
  60                 ret = -ENOMEM;
  61                 goto err1;
  62         }
  63
  64         exynos->usb3_phy = pdev;
  65         pdata.type = USB_PHY_TYPE_USB3;
  66
  67         ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
  68         if (ret)
  69                 goto err2;
  70
  71         ret = platform_device_add(exynos->usb2_phy);
  72         if (ret)
  73                 goto err2;
  74
  75         ret = platform_device_add(exynos->usb3_phy);
  76         if (ret)
  77                 goto err3;
  78
  79         return 0;
  80
  81 err3:
  82         platform_device_del(exynos->usb2_phy);
  83
  84 err2:
  85         platform_device_put(exynos->usb3_phy);
  86
  87 err1:
  88         platform_device_put(exynos->usb2_phy);
  89
  90         return ret;
  91 }
  92
  93 static int dwc3_exynos_remove_child(struct device *dev, void *unused)
  94 {
  95         struct platform_device *pdev = to_platform_device(dev);
  96
  97         platform_device_unregister(pdev);
  98
  99         return 0;
 100 }
 101
 102 static int dwc3_exynos_probe(struct platform_device *pdev)
 103 {
 104         struct dwc3_exynos      *exynos;
 105         struct clk              *clk;
 106         struct device           *dev = &pdev->dev;
 107         struct device_node      *node = dev->of_node;
 108
 109         int                     ret = -ENOMEM;
 110
 111         exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
 112         if (!exynos) {
 113                 dev_err(dev, "not enough memory\n");
 114                 goto err1;
 115         }
 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                 goto err1;
 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                 goto err1;
 132         }
 133
 134         clk = devm_clk_get(dev, "usbdrd30");
 135         if (IS_ERR(clk)) {
 136                 dev_err(dev, "couldn't get clock\n");
 137                 ret = -EINVAL;
 138                 goto err1;
 139         }
 140
 141         exynos->dev     = dev;
 142         exynos->clk     = clk;
 143
 144         clk_prepare_enable(exynos->clk);
 145
 146         if (node) {
 147                 ret = of_platform_populate(node, NULL, NULL, dev);
 148                 if (ret) {
 149                         dev_err(dev, "failed to add dwc3 core\n");
 150                         goto err2;
 151                 }
 152         } else {
 153                 dev_err(dev, "no device node, failed to add dwc3 core\n");
 154                 ret = -ENODEV;
 155                 goto err2;
 156         }
 157
 158         return 0;
 159
 160 err2:
 161         clk_disable_unprepare(clk);
 162 err1:
 163         return ret;
 164 }
 165
 166 static int dwc3_exynos_remove(struct platform_device *pdev)
 167 {
 168         struct dwc3_exynos      *exynos = platform_get_drvdata(pdev);
 169
 170         device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
 171         platform_device_unregister(exynos->usb2_phy);
 172         platform_device_unregister(exynos->usb3_phy);
 173
 174         clk_disable_unprepare(exynos->clk);
 175
 176         return 0;
 177 }
 178
 179 #ifdef CONFIG_OF
 180 static const struct of_device_id exynos_dwc3_match[] = {
 181         { .compatible = "samsung,exynos5250-dwusb3" },
 182         {},
 183 };
 184 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
 185 #endif
 186
 187 #ifdef CONFIG_PM_SLEEP
 188 static int dwc3_exynos_suspend(struct device *dev)
 189 {
 190         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
 191
 192         clk_disable(exynos->clk);
 193
 194         return 0;
 195 }
 196
 197 static int dwc3_exynos_resume(struct device *dev)
 198 {
 199         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
 200
 201         clk_enable(exynos->clk);
 202
 203         /* runtime set active to reflect active state. */
 204         pm_runtime_disable(dev);
 205         pm_runtime_set_active(dev);
 206         pm_runtime_enable(dev);
 207
 208         return 0;
 209 }
 210
 211 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
 212         SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
 213 };
 214
 215 #define DEV_PM_OPS      (&dwc3_exynos_dev_pm_ops)
 216 #else
 217 #define DEV_PM_OPS      NULL
 218 #endif /* CONFIG_PM_SLEEP */
 219
 220 static struct platform_driver dwc3_exynos_driver = {
 221         .probe          = dwc3_exynos_probe,
 222         .remove         = dwc3_exynos_remove,
 223         .driver         = {
 224                 .name   = "exynos-dwc3",
 225                 .of_match_table = of_match_ptr(exynos_dwc3_match),
 226                 .pm     = DEV_PM_OPS,
 227         },
 228 };
 229
 230 module_platform_driver(dwc3_exynos_driver);
 231
 232 MODULE_ALIAS("platform:exynos-dwc3");
 233 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
 234 MODULE_LICENSE("GPL v2");
 235 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");