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Linux/arch/mn10300/unit-asb2305/pci-iomap.c

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  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);
 36 

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