36 lines
1.0 KiB
C
36 lines
1.0 KiB
C
/* 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);
|