/* ASB2305 PCI I/O mapping handler
   *
   * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   * Written by David Howells (dhowells@redhat.com)
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public Licence
   * as published by the Free Software Foundation; either version
   * 2 of the Licence, or (at your option) any later version.
   */
  #include <linux/pci.h>
  #include <linux/module.h>
  
  /*
   * Create a virtual mapping cookie for a PCI BAR (memory or IO)
   */
  void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
  {
  	resource_size_t start = pci_resource_start(dev, bar);
  	resource_size_t len = pci_resource_len(dev, bar);
  	unsigned long flags = pci_resource_flags(dev, bar);
  
  	if (!len || !start)
  		return NULL;
  
  	if ((flags & IORESOURCE_IO) || (flags & IORESOURCE_MEM)) {
  		if (flags & IORESOURCE_CACHEABLE && !(flags & IORESOURCE_IO))
  			return ioremap(start, len);
  		else
  			return ioremap_nocache(start, len);
  	}
  
  	return NULL;
  }
  EXPORT_SYMBOL(pci_iomap);