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 struct dwc3_exynos {
  27         struct platform_device  *dwc3;
  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 u64 dwc3_exynos_dma_mask = DMA_BIT_MASK(32);
  90
  91 static int dwc3_exynos_probe(struct platform_device *pdev)
  92 {
  93         struct platform_device  *dwc3;
  94         struct dwc3_exynos      *exynos;
  95         struct clk              *clk;
  96         struct device           *dev = &pdev->dev;
  97
  98         int                     ret = -ENOMEM;
  99
 100         exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
 101         if (!exynos) {
 102                 dev_err(dev, "not enough memory\n");
 103                 return -ENOMEM;
 104         }
 105
 106         /*
 107          * Right now device-tree probed devices don't get dma_mask set.
 108          * Since shared usb code relies on it, set it here for now.
 109          * Once we move to full device tree support this will vanish off.
 110          */
 111         if (!pdev->dev.dma_mask)
 112                 pdev->dev.dma_mask = &dwc3_exynos_dma_mask;
 113
 114         platform_set_drvdata(pdev, exynos);
 115
 116         ret = dwc3_exynos_register_phys(exynos);
 117         if (ret) {
 118                 dev_err(dev, "couldn't register PHYs\n");
 119                 return ret;
 120         }
 121
 122         dwc3 = platform_device_alloc("dwc3", PLATFORM_DEVID_AUTO);
 123         if (!dwc3) {
 124                 dev_err(dev, "couldn't allocate dwc3 device\n");
 125                 return -ENOMEM;
 126         }
 127
 128         clk = devm_clk_get(dev, "usbdrd30");
 129         if (IS_ERR(clk)) {
 130                 dev_err(dev, "couldn't get clock\n");
 131                 ret = -EINVAL;
 132                 goto err1;
 133         }
 134
 135         dma_set_coherent_mask(&dwc3->dev, dev->coherent_dma_mask);
 136
 137         dwc3->dev.parent = dev;
 138         dwc3->dev.dma_mask = dev->dma_mask;
 139         dwc3->dev.dma_parms = dev->dma_parms;
 140         exynos->dwc3    = dwc3;
 141         exynos->dev     = dev;
 142         exynos->clk     = clk;
 143
 144         clk_enable(exynos->clk);
 145
 146         ret = platform_device_add_resources(dwc3, pdev->resource,
 147                         pdev->num_resources);
 148         if (ret) {
 149                 dev_err(dev, "couldn't add resources to dwc3 device\n");
 150                 goto err2;
 151         }
 152
 153         ret = platform_device_add(dwc3);
 154         if (ret) {
 155                 dev_err(dev, "failed to register dwc3 device\n");
 156                 goto err2;
 157         }
 158
 159         return 0;
 160
 161 err2:
 162         clk_disable(clk);
 163 err1:
 164         platform_device_put(dwc3);
 165
 166         return ret;
 167 }
 168
 169 static int dwc3_exynos_remove(struct platform_device *pdev)
 170 {
 171         struct dwc3_exynos      *exynos = platform_get_drvdata(pdev);
 172
 173         platform_device_unregister(exynos->dwc3);
 174         platform_device_unregister(exynos->usb2_phy);
 175         platform_device_unregister(exynos->usb3_phy);
 176
 177         clk_disable(exynos->clk);
 178
 179         return 0;
 180 }
 181
 182 #ifdef CONFIG_OF
 183 static const struct of_device_id exynos_dwc3_match[] = {
 184         { .compatible = "samsung,exynos5250-dwusb3" },
 185         {},
 186 };
 187 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
 188 #endif
 189
 190 static struct platform_driver dwc3_exynos_driver = {
 191         .probe          = dwc3_exynos_probe,
 192         .remove         = dwc3_exynos_remove,
 193         .driver         = {
 194                 .name   = "exynos-dwc3",
 195                 .of_match_table = of_match_ptr(exynos_dwc3_match),
 196         },
 197 };
 198
 199 module_platform_driver(dwc3_exynos_driver);
 200
 201 MODULE_ALIAS("platform:exynos-dwc3");
 202 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
 203 MODULE_LICENSE("GPL");
 204 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");