blob: c10fba461454fc8efe03b9fb46719ee80dad6a47
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_range - create a virtual mapping cookie for a PCI BAR |
14 | * @dev: PCI device that owns the BAR |
15 | * @bar: BAR number |
16 | * @offset: map memory at the given offset in BAR |
17 | * @maxlen: max length of the memory to map |
18 | * |
19 | * Using this function you will get a __iomem address to your device BAR. |
20 | * You can access it using ioread*() and iowrite*(). These functions hide |
21 | * the details if this is a MMIO or PIO address space and will just do what |
22 | * you expect from them in the correct way. |
23 | * |
24 | * @maxlen specifies the maximum length to map. If you want to get access to |
25 | * the complete BAR from offset to the end, pass %0 here. |
26 | * */ |
27 | void __iomem *pci_iomap_range(struct pci_dev *dev, |
28 | int bar, |
29 | unsigned long offset, |
30 | unsigned long maxlen) |
31 | { |
32 | resource_size_t start = pci_resource_start(dev, bar); |
33 | resource_size_t len = pci_resource_len(dev, bar); |
34 | unsigned long flags = pci_resource_flags(dev, bar); |
35 | |
36 | if (len <= offset || !start) |
37 | return NULL; |
38 | len -= offset; |
39 | start += offset; |
40 | if (maxlen && len > maxlen) |
41 | len = maxlen; |
42 | if (flags & IORESOURCE_IO) |
43 | return __pci_ioport_map(dev, start, len); |
44 | if (flags & IORESOURCE_MEM) |
45 | return ioremap(start, len); |
46 | /* What? */ |
47 | return NULL; |
48 | } |
49 | EXPORT_SYMBOL(pci_iomap_range); |
50 | |
51 | /** |
52 | * pci_iomap_wc_range - create a virtual WC mapping cookie for a PCI BAR |
53 | * @dev: PCI device that owns the BAR |
54 | * @bar: BAR number |
55 | * @offset: map memory at the given offset in BAR |
56 | * @maxlen: max length of the memory to map |
57 | * |
58 | * Using this function you will get a __iomem address to your device BAR. |
59 | * You can access it using ioread*() and iowrite*(). These functions hide |
60 | * the details if this is a MMIO or PIO address space and will just do what |
61 | * you expect from them in the correct way. When possible write combining |
62 | * is used. |
63 | * |
64 | * @maxlen specifies the maximum length to map. If you want to get access to |
65 | * the complete BAR from offset to the end, pass %0 here. |
66 | * */ |
67 | void __iomem *pci_iomap_wc_range(struct pci_dev *dev, |
68 | int bar, |
69 | unsigned long offset, |
70 | unsigned long maxlen) |
71 | { |
72 | resource_size_t start = pci_resource_start(dev, bar); |
73 | resource_size_t len = pci_resource_len(dev, bar); |
74 | unsigned long flags = pci_resource_flags(dev, bar); |
75 | |
76 | |
77 | if (flags & IORESOURCE_IO) |
78 | return NULL; |
79 | |
80 | if (len <= offset || !start) |
81 | return NULL; |
82 | |
83 | len -= offset; |
84 | start += offset; |
85 | if (maxlen && len > maxlen) |
86 | len = maxlen; |
87 | |
88 | if (flags & IORESOURCE_MEM) |
89 | return ioremap_wc(start, len); |
90 | |
91 | /* What? */ |
92 | return NULL; |
93 | } |
94 | EXPORT_SYMBOL_GPL(pci_iomap_wc_range); |
95 | |
96 | /** |
97 | * pci_iomap - create a virtual mapping cookie for a PCI BAR |
98 | * @dev: PCI device that owns the BAR |
99 | * @bar: BAR number |
100 | * @maxlen: length of the memory to map |
101 | * |
102 | * Using this function you will get a __iomem address to your device BAR. |
103 | * You can access it using ioread*() and iowrite*(). These functions hide |
104 | * the details if this is a MMIO or PIO address space and will just do what |
105 | * you expect from them in the correct way. |
106 | * |
107 | * @maxlen specifies the maximum length to map. If you want to get access to |
108 | * the complete BAR without checking for its length first, pass %0 here. |
109 | * */ |
110 | void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) |
111 | { |
112 | return pci_iomap_range(dev, bar, 0, maxlen); |
113 | } |
114 | EXPORT_SYMBOL(pci_iomap); |
115 | |
116 | /** |
117 | * pci_iomap_wc - create a virtual WC mapping cookie for a PCI BAR |
118 | * @dev: PCI device that owns the BAR |
119 | * @bar: BAR number |
120 | * @maxlen: length of the memory to map |
121 | * |
122 | * Using this function you will get a __iomem address to your device BAR. |
123 | * You can access it using ioread*() and iowrite*(). These functions hide |
124 | * the details if this is a MMIO or PIO address space and will just do what |
125 | * you expect from them in the correct way. When possible write combining |
126 | * is used. |
127 | * |
128 | * @maxlen specifies the maximum length to map. If you want to get access to |
129 | * the complete BAR without checking for its length first, pass %0 here. |
130 | * */ |
131 | void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen) |
132 | { |
133 | return pci_iomap_wc_range(dev, bar, 0, maxlen); |
134 | } |
135 | EXPORT_SYMBOL_GPL(pci_iomap_wc); |
136 | #endif /* CONFIG_PCI */ |
137 |