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  */
  17 void __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 }
  35 EXPORT_SYMBOL(pci_iomap);