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