text: /**
   * dwc3-exynos.c - Samsung EXYNOS DWC3 Specific Glue layer
   *
   * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   *		http://www.samsung.com
   *
   * Author: Anton Tikhomirov <av.tikhomirov@samsung.com>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   */
  
  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/slab.h>
  #include <linux/platform_device.h>
  #include <linux/platform_data/dwc3-exynos.h>
  #include <linux/dma-mapping.h>
  #include <linux/module.h>
  #include <linux/clk.h>
  
  #include "core.h"
  
  struct dwc3_exynos {
  	struct platform_device	*dwc3;
  	struct device		*dev;
  
  	struct clk		*clk;
  };
  
  static int __devinit dwc3_exynos_probe(struct platform_device *pdev)
  {
  	struct dwc3_exynos_data	*pdata = pdev->dev.platform_data;
  	struct platform_device	*dwc3;
  	struct dwc3_exynos	*exynos;
  	struct clk		*clk;
  
  	int			devid;
  	int			ret = -ENOMEM;
  
  	exynos = kzalloc(sizeof(*exynos), GFP_KERNEL);
  	if (!exynos) {
  		dev_err(&pdev->dev, "not enough memory\n");
  		goto err0;
  	}
  
  	platform_set_drvdata(pdev, exynos);
  
  	devid = dwc3_get_device_id();
  	if (devid < 0)
  		goto err1;
  
  	dwc3 = platform_device_alloc("dwc3", devid);
  	if (!dwc3) {
  		dev_err(&pdev->dev, "couldn't allocate dwc3 device\n");
  		goto err2;
  	}
  
  	clk = clk_get(&pdev->dev, "usbdrd30");
  	if (IS_ERR(clk)) {
  		dev_err(&pdev->dev, "couldn't get clock\n");
  		ret = -EINVAL;
  		goto err3;
  	}
  
  	dma_set_coherent_mask(&dwc3->dev, pdev->dev.coherent_dma_mask);
  
  	dwc3->dev.parent = &pdev->dev;
  	dwc3->dev.dma_mask = pdev->dev.dma_mask;
  	dwc3->dev.dma_parms = pdev->dev.dma_parms;
  	exynos->dwc3	= dwc3;
  	exynos->dev	= &pdev->dev;
  	exynos->clk	= clk;
  
  	clk_enable(exynos->clk);
  
  	/* PHY initialization */
  	if (!pdata) {
  		dev_dbg(&pdev->dev, "missing platform data\n");
  	} else {
  		if (pdata->phy_init)
  			pdata->phy_init(pdev, pdata->phy_type);
  	}
  
  	ret = platform_device_add_resources(dwc3, pdev->resource,
  			pdev->num_resources);
  	if (ret) {
  		dev_err(&pdev->dev, "couldn't add resources to dwc3 device\n");
  		goto err4;
  	}
  
  	ret = platform_device_add(dwc3);
  	if (ret) {
  		dev_err(&pdev->dev, "failed to register dwc3 device\n");
  		goto err4;
  	}
  
  	return 0;
  
  err4:
  	if (pdata && pdata->phy_exit)
  		pdata->phy_exit(pdev, pdata->phy_type);
  
  	clk_disable(clk);
  	clk_put(clk);
  err3:
  	platform_device_put(dwc3);
  err2:
  	dwc3_put_device_id(devid);
  err1:
  	kfree(exynos);
  err0:
  	return ret;
  }
  
  static int __devexit dwc3_exynos_remove(struct platform_device *pdev)
  {
  	struct dwc3_exynos	*exynos = platform_get_drvdata(pdev);
  	struct dwc3_exynos_data *pdata = pdev->dev.platform_data;
  
  	platform_device_unregister(exynos->dwc3);
  
  	dwc3_put_device_id(exynos->dwc3->id);
  
  	if (pdata && pdata->phy_exit)
  		pdata->phy_exit(pdev, pdata->phy_type);
  
  	clk_disable(exynos->clk);
  	clk_put(exynos->clk);
  
  	kfree(exynos);
  
  	return 0;
  }
  
  static struct platform_driver dwc3_exynos_driver = {
  	.probe		= dwc3_exynos_probe,
  	.remove		= __devexit_p(dwc3_exynos_remove),
  	.driver		= {
  		.name	= "exynos-dwc3",
  	},
  };
  
  module_platform_driver(dwc3_exynos_driver);
  
  MODULE_ALIAS("platform:exynos-dwc3");
  MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
  MODULE_LICENSE("GPL");
  MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");
  