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

http://github.com/mirrors/linux
C | 35 lines | 18 code | 4 blank | 13 comment | 6 complexity | b80c25b368657cf472170f89caadddf8 MD5 | raw file
 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);