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