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
  23 #include "core.h"
  24
  25 struct dwc3_exynos {
  26         struct platform_device  *dwc3;
  27         struct device           *dev;
  28
  29         struct clk              *clk;
  30 };
  31
  32 static int __devinit dwc3_exynos_probe(struct platform_device *pdev)
  33 {
  34         struct dwc3_exynos_data *pdata = pdev->dev.platform_data;
  35         struct platform_device  *dwc3;
  36         struct dwc3_exynos      *exynos;
  37         struct clk              *clk;
  38
  39         int                     devid;
  40         int                     ret = -ENOMEM;
  41
  42         exynos = kzalloc(sizeof(*exynos), GFP_KERNEL);
  43         if (!exynos) {
  44                 dev_err(&pdev->dev, "not enough memory\n");
  45                 goto err0;
  46         }
  47
  48         platform_set_drvdata(pdev, exynos);
  49
  50         devid = dwc3_get_device_id();
  51         if (devid < 0)
  52                 goto err1;
  53
  54         dwc3 = platform_device_alloc("dwc3", devid);
  55         if (!dwc3) {
  56                 dev_err(&pdev->dev, "couldn't allocate dwc3 device\n");
  57                 goto err2;
  58         }
  59
  60         clk = clk_get(&pdev->dev, "usbdrd30");
  61         if (IS_ERR(clk)) {
  62                 dev_err(&pdev->dev, "couldn't get clock\n");
  63                 ret = -EINVAL;
  64                 goto err3;
  65         }
  66
  67         dma_set_coherent_mask(&dwc3->dev, pdev->dev.coherent_dma_mask);
  68
  69         dwc3->dev.parent = &pdev->dev;
  70         dwc3->dev.dma_mask = pdev->dev.dma_mask;
  71         dwc3->dev.dma_parms = pdev->dev.dma_parms;
  72         exynos->dwc3    = dwc3;
  73         exynos->dev     = &pdev->dev;
  74         exynos->clk     = clk;
  75
  76         clk_enable(exynos->clk);
  77
  78         /* PHY initialization */
  79         if (!pdata) {
  80                 dev_dbg(&pdev->dev, "missing platform data\n");
  81         } else {
  82                 if (pdata->phy_init)
  83                         pdata->phy_init(pdev, pdata->phy_type);
  84         }
  85
  86         ret = platform_device_add_resources(dwc3, pdev->resource,
  87                         pdev->num_resources);
  88         if (ret) {
  89                 dev_err(&pdev->dev, "couldn't add resources to dwc3 device\n");
  90                 goto err4;
  91         }
  92
  93         ret = platform_device_add(dwc3);
  94         if (ret) {
  95                 dev_err(&pdev->dev, "failed to register dwc3 device\n");
  96                 goto err4;
  97         }
  98
  99         return 0;
 100
 101 err4:
 102         if (pdata && pdata->phy_exit)
 103                 pdata->phy_exit(pdev, pdata->phy_type);
 104
 105         clk_disable(clk);
 106         clk_put(clk);
 107 err3:
 108         platform_device_put(dwc3);
 109 err2:
 110         dwc3_put_device_id(devid);
 111 err1:
 112         kfree(exynos);
 113 err0:
 114         return ret;
 115 }
 116
 117 static int __devexit dwc3_exynos_remove(struct platform_device *pdev)
 118 {
 119         struct dwc3_exynos      *exynos = platform_get_drvdata(pdev);
 120         struct dwc3_exynos_data *pdata = pdev->dev.platform_data;
 121
 122         platform_device_unregister(exynos->dwc3);
 123
 124         dwc3_put_device_id(exynos->dwc3->id);
 125
 126         if (pdata && pdata->phy_exit)
 127                 pdata->phy_exit(pdev, pdata->phy_type);
 128
 129         clk_disable(exynos->clk);
 130         clk_put(exynos->clk);
 131
 132         kfree(exynos);
 133
 134         return 0;
 135 }
 136
 137 static struct platform_driver dwc3_exynos_driver = {
 138         .probe          = dwc3_exynos_probe,
 139         .remove         = __devexit_p(dwc3_exynos_remove),
 140         .driver         = {
 141                 .name   = "exynos-dwc3",
 142         },
 143 };
 144
 145 module_platform_driver(dwc3_exynos_driver);
 146
 147 MODULE_ALIAS("platform:exynos-dwc3");
 148 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
 149 MODULE_LICENSE("GPL");
 150 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");