2 * Implement the default iomap interfaces
4 * (C) Copyright 2004 Linus Torvalds
9 #include <linux/export.h>
13 * pci_iomap - create a virtual mapping cookie for a PCI BAR
14 * @dev: PCI device that owns the BAR
16 * @maxlen: length of the memory to map
18 * Using this function you will get a __iomem address to your device BAR.
19 * You can access it using ioread*() and iowrite*(). These functions hide
20 * the details if this is a MMIO or PIO address space and will just do what
21 * you expect from them in the correct way.
23 * @maxlen specifies the maximum length to map. If you want to get access to
24 * the complete BAR without checking for its length first, pass %0 here.
26 void __iomem
*pci_iomap(struct pci_dev
*dev
, int bar
, unsigned long maxlen
)
28 resource_size_t start
= pci_resource_start(dev
, bar
);
29 resource_size_t len
= pci_resource_len(dev
, bar
);
30 unsigned long flags
= pci_resource_flags(dev
, bar
);
34 if (maxlen
&& len
> maxlen
)
36 if (flags
& IORESOURCE_IO
)
37 return ioport_map(start
, len
);
38 if (flags
& IORESOURCE_MEM
) {
39 if (flags
& IORESOURCE_CACHEABLE
)
40 return ioremap(start
, len
);
41 return ioremap_nocache(start
, len
);
47 EXPORT_SYMBOL(pci_iomap
);
48 #endif /* CONFIG_PCI */
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