text: /*
   * linux/driver/usb/host/ehci-w90x900.c
   *
   * Copyright (c) 2008 Nuvoton technology corporation.
   *
   * Wan ZongShun <mcuos.com@gmail.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;version 2 of the License.
   *
   */
  
  #include <linux/dma-mapping.h>
  #include <linux/io.h>
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/of.h>
  #include <linux/platform_device.h>
  #include <linux/usb.h>
  #include <linux/usb/hcd.h>
  
  #include "ehci.h"
  
  /* enable phy0 and phy1 for w90p910 */
  #define	ENPHY		(0x01<<8)
  #define PHY0_CTR	(0xA4)
  #define PHY1_CTR	(0xA8)
  
  #define DRIVER_DESC "EHCI w90x900 driver"
  
  static const char hcd_name[] = "ehci-w90x900 ";
  
  static struct hc_driver __read_mostly ehci_w90x900_hc_driver;
  
  static int usb_w90x900_probe(const struct hc_driver *driver,
  		      struct platform_device *pdev)
  {
  	struct usb_hcd *hcd;
  	struct ehci_hcd *ehci;
  	struct resource *res;
  	int retval = 0, irq;
  	unsigned long val;
  
  
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	if (!res) {
  		retval = -ENXIO;
  		goto err1;
  	}
  
  	hcd = usb_create_hcd(driver, &pdev->dev, "w90x900 EHCI");
  	if (!hcd) {
  		retval = -ENOMEM;
  		goto err1;
  	}
  
  	hcd->rsrc_start = res->start;
  	hcd->rsrc_len = resource_size(res);
  
  	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
  		retval = -EBUSY;
  		goto err2;
  	}
  
  	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
  	if (hcd->regs == NULL) {
  		retval = -EFAULT;
  		goto err3;
  	}
  
  	ehci = hcd_to_ehci(hcd);
  	ehci->caps = hcd->regs;
  	ehci->regs = hcd->regs +
  		HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
  
  	/* enable PHY 0,1,the regs only apply to w90p910
  	*  0xA4,0xA8 were offsets of PHY0 and PHY1 controller of
  	*  w90p910 IC relative to ehci->regs.
  	*/
  	val = __raw_readl(ehci->regs+PHY0_CTR);
  	val |= ENPHY;
  	__raw_writel(val, ehci->regs+PHY0_CTR);
  
  	val = __raw_readl(ehci->regs+PHY1_CTR);
  	val |= ENPHY;
  	__raw_writel(val, ehci->regs+PHY1_CTR);
  
  	irq = platform_get_irq(pdev, 0);
  	if (irq < 0)
  		goto err4;
  
  	retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
  	if (retval != 0)
  		goto err4;
  
  	return retval;
  err4:
  	iounmap(hcd->regs);
  err3:
  	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
  err2:
  	usb_put_hcd(hcd);
  err1:
  	return retval;
  }
  
  static void usb_w90x900_remove(struct usb_hcd *hcd,
  			struct platform_device *pdev)
  {
  	usb_remove_hcd(hcd);
  	iounmap(hcd->regs);
  	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
  	usb_put_hcd(hcd);
  }
  
  static int ehci_w90x900_probe(struct platform_device *pdev)
  {
  	if (usb_disabled())
  		return -ENODEV;
  
  	return usb_w90x900_probe(&ehci_w90x900_hc_driver, pdev);
  }
  
  static int ehci_w90x900_remove(struct platform_device *pdev)
  {
  	struct usb_hcd *hcd = platform_get_drvdata(pdev);
  
  	usb_w90x900_remove(hcd, pdev);
  
  	return 0;
  }
  
  static struct platform_driver ehci_hcd_w90x900_driver = {
  	.probe  = ehci_w90x900_probe,
  	.remove = ehci_w90x900_remove,
  	.driver = {
  		.name = "w90x900-ehci",
  		.owner = THIS_MODULE,
  	},
  };
  
  static int __init ehci_w90X900_init(void)
  {
  	if (usb_disabled())
  		return -ENODEV;
  
  	pr_info("%s: " DRIVER_DESC "\n", hcd_name);
  
  	ehci_init_driver(&ehci_w90x900_hc_driver, NULL);
  	return platform_driver_register(&ehci_hcd_w90x900_driver);
  }
  module_init(ehci_w90X900_init);
  
  static void __exit ehci_w90X900_cleanup(void)
  {
  	platform_driver_unregister(&ehci_hcd_w90x900_driver);
  }
  module_exit(ehci_w90X900_cleanup);
  
  MODULE_DESCRIPTION(DRIVER_DESC);
  MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
  MODULE_ALIAS("platform:w90p910-ehci");
  MODULE_LICENSE("GPL v2");
  