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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 * */
26void __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
47EXPORT_SYMBOL(pci_iomap);
48#endif /* CONFIG_PCI */
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 * */
27void __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}
49EXPORT_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 * */
67void __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}
94EXPORT_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 * */
110void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
111{
112 return pci_iomap_range(dev, bar, 0, maxlen);
113}
114EXPORT_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 * */
131void __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}
135EXPORT_SYMBOL_GPL(pci_iomap_wc);
136#endif /* CONFIG_PCI */