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 */ pci_iomap(struct pci_dev * dev,int bar,unsigned long maxlen)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 return (void __iomem *) start; 28 29 return NULL; 30 } 31 EXPORT_SYMBOL(pci_iomap); 32