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1 | /* |
2 | * Implement the default iomap interfaces |
3 | * |
4 | * (C) Copyright 2004 Linus Torvalds |
5 | */ |
6 | #include <linux/pci.h> |
7 | #include <linux/io.h> |
8 | |
9 | #include <linux/export.h> |
10 | |
11 | #ifdef CONFIG_PCI |
12 | /** |
13 | * pci_iomap - create a virtual mapping cookie for a PCI BAR |
14 | * @dev: PCI device that owns the BAR |
15 | * @bar: BAR number |
16 | * @maxlen: length of the memory to map |
17 | * |
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. |
22 | * |
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. |
25 | * */ |
26 | void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) |
27 | { |
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); |
31 | |
32 | if (!len || !start) |
33 | return NULL; |
34 | if (maxlen && len > maxlen) |
35 | len = maxlen; |
36 | if (flags & IORESOURCE_IO) |
37 | return __pci_ioport_map(dev, start, len); |
38 | if (flags & IORESOURCE_MEM) { |
39 | if (flags & IORESOURCE_CACHEABLE) |
40 | return ioremap(start, len); |
41 | return ioremap_nocache(start, len); |
42 | } |
43 | /* What? */ |
44 | return NULL; |
45 | } |
46 | |
47 | EXPORT_SYMBOL(pci_iomap); |
48 | #endif /* CONFIG_PCI */ |
49 |
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