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
  26 #include "core.h"
  27
  28 struct dwc3_exynos {
  29         struct platform_device  *dwc3;
  30         struct platform_device  *usb2_phy;
  31         struct platform_device  *usb3_phy;
  32         struct device           *dev;
  33
  34         struct clk              *clk;
  35 };
  36
  37 static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
  38 {
  39         struct nop_usb_xceiv_platform_data pdata;
  40         struct platform_device  *pdev;
  41         int                     ret;
  42
  43         memset(&pdata, 0x00, sizeof(pdata));
  44
  45         pdev = platform_device_alloc("nop_usb_xceiv", PLATFORM_DEVID_AUTO);
  46         if (!pdev)
  47                 return -ENOMEM;
  48
  49         exynos->usb2_phy = pdev;
  50         pdata.type = USB_PHY_TYPE_USB2;
  51
  52         ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
  53         if (ret)
  54                 goto err1;
  55
  56         pdev = platform_device_alloc("nop_usb_xceiv", PLATFORM_DEVID_AUTO);
  57         if (!pdev) {
  58                 ret = -ENOMEM;
  59                 goto err1;
  60         }
  61
  62         exynos->usb3_phy = pdev;
  63         pdata.type = USB_PHY_TYPE_USB3;
  64
  65         ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
  66         if (ret)
  67                 goto err2;
  68
  69         ret = platform_device_add(exynos->usb2_phy);
  70         if (ret)
  71                 goto err2;
  72
  73         ret = platform_device_add(exynos->usb3_phy);
  74         if (ret)
  75                 goto err3;
  76
  77         return 0;
  78
  79 err3:
  80         platform_device_del(exynos->usb2_phy);
  81
  82 err2:
  83         platform_device_put(exynos->usb3_phy);
  84
  85 err1:
  86         platform_device_put(exynos->usb2_phy);
  87
  88         return ret;
  89 }
  90
  91 static u64 dwc3_exynos_dma_mask = DMA_BIT_MASK(32);
  92
  93 static int dwc3_exynos_probe(struct platform_device *pdev)
  94 {
  95         struct platform_device  *dwc3;
  96         struct dwc3_exynos      *exynos;
  97         struct clk              *clk;
  98         struct device           *dev = &pdev->dev;
  99
 100         int                     ret = -ENOMEM;
 101
 102         exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
 103         if (!exynos) {
 104                 dev_err(dev, "not enough memory\n");
 105                 return -ENOMEM;
 106         }
 107
 108         /*
 109          * Right now device-tree probed devices don't get dma_mask set.
 110          * Since shared usb code relies on it, set it here for now.
 111          * Once we move to full device tree support this will vanish off.
 112          */
 113         if (!pdev->dev.dma_mask)
 114                 pdev->dev.dma_mask = &dwc3_exynos_dma_mask;
 115
 116         platform_set_drvdata(pdev, exynos);
 117
 118         ret = dwc3_exynos_register_phys(exynos);
 119         if (ret) {
 120                 dev_err(dev, "couldn't register PHYs\n");
 121                 return ret;
 122         }
 123
 124         dwc3 = platform_device_alloc("dwc3", PLATFORM_DEVID_AUTO);
 125         if (!dwc3) {
 126                 dev_err(dev, "couldn't allocate dwc3 device\n");
 127                 return -ENOMEM;
 128         }
 129
 130         clk = devm_clk_get(dev, "usbdrd30");
 131         if (IS_ERR(clk)) {
 132                 dev_err(dev, "couldn't get clock\n");
 133                 ret = -EINVAL;
 134                 goto err1;
 135         }
 136
 137         dma_set_coherent_mask(&dwc3->dev, dev->coherent_dma_mask);
 138
 139         dwc3->dev.parent = dev;
 140         dwc3->dev.dma_mask = dev->dma_mask;
 141         dwc3->dev.dma_parms = dev->dma_parms;
 142         exynos->dwc3    = dwc3;
 143         exynos->dev     = dev;
 144         exynos->clk     = clk;
 145
 146         clk_enable(exynos->clk);
 147
 148         ret = platform_device_add_resources(dwc3, pdev->resource,
 149                         pdev->num_resources);
 150         if (ret) {
 151                 dev_err(dev, "couldn't add resources to dwc3 device\n");
 152                 goto err2;
 153         }
 154
 155         ret = platform_device_add(dwc3);
 156         if (ret) {
 157                 dev_err(dev, "failed to register dwc3 device\n");
 158                 goto err2;
 159         }
 160
 161         return 0;
 162
 163 err2:
 164         clk_disable(clk);
 165 err1:
 166         platform_device_put(dwc3);
 167
 168         return ret;
 169 }
 170
 171 static int dwc3_exynos_remove(struct platform_device *pdev)
 172 {
 173         struct dwc3_exynos      *exynos = platform_get_drvdata(pdev);
 174
 175         platform_device_unregister(exynos->dwc3);
 176         platform_device_unregister(exynos->usb2_phy);
 177         platform_device_unregister(exynos->usb3_phy);
 178
 179         clk_disable(exynos->clk);
 180
 181         return 0;
 182 }
 183
 184 #ifdef CONFIG_OF
 185 static const struct of_device_id exynos_dwc3_match[] = {
 186         { .compatible = "samsung,exynos5250-dwusb3" },
 187         {},
 188 };
 189 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
 190 #endif
 191
 192 static struct platform_driver dwc3_exynos_driver = {
 193         .probe          = dwc3_exynos_probe,
 194         .remove         = dwc3_exynos_remove,
 195         .driver         = {
 196                 .name   = "exynos-dwc3",
 197                 .of_match_table = of_match_ptr(exynos_dwc3_match),
 198         },
 199 };
 200
 201 module_platform_driver(dwc3_exynos_driver);
 202
 203 MODULE_ALIAS("platform:exynos-dwc3");
 204 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
 205 MODULE_LICENSE("GPL");
 206 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");