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pci-iomap.c

/* pci-iomap.c: description
 *
 * Copyright (C) 2006 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 License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */
#include <linux/pci.h>
#include <linux/module.h>

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))
            return (void __iomem *) start;

      return NULL;
}

EXPORT_SYMBOL(pci_iomap);

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