LXR linux/arch/mn10300/unit-asb2305/pci-iomap.c

   1/* ASB2305 PCI I/O mapping handler
   2 *
   3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4 * Written by David Howells (dhowells@redhat.com)
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public Licence
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the Licence, or (at your option) any later version.
  10 */
  11#include <linux/pci.h>
  12#include <linux/module.h>
  13
  14/*
  15 * Create a virtual mapping cookie for a PCI BAR (memory or IO)
  16 */
  17void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
  18{
  19        resource_size_t start = pci_resource_start(dev, bar);
  20        resource_size_t len = pci_resource_len(dev, bar);
  21        unsigned long flags = pci_resource_flags(dev, bar);
  22
  23        if (!len || !start)
  24                return NULL;
  25
  26        if ((flags & IORESOURCE_IO) || (flags & IORESOURCE_MEM)) {
  27                if (flags & IORESOURCE_CACHEABLE && !(flags & IORESOURCE_IO))
  28                        return ioremap(start, len);
  29                else
  30                        return ioremap_nocache(start, len);
  31        }
  32
  33        return NULL;
  34}
  35EXPORT_SYMBOL(pci_iomap);
  36