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b920de1b DH |
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 | { | |
b70d3a2c BH |
19 | resource_size_t start = pci_resource_start(dev, bar); |
20 | resource_size_t len = pci_resource_len(dev, bar); | |
b920de1b DH |
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 | return (void __iomem *) start; | |
28 | ||
29 | return NULL; | |
30 | } | |
31 | EXPORT_SYMBOL(pci_iomap); |