Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #include <linux/pci.h> |
2 | #include <linux/module.h> | |
3 | #include <linux/ioport.h> | |
4 | ||
5 | /* | |
6 | * This interrupt-safe spinlock protects all accesses to PCI | |
7 | * configuration space. | |
8 | */ | |
9 | ||
10 | static DEFINE_SPINLOCK(pci_lock); | |
11 | ||
12 | /* | |
13 | * Wrappers for all PCI configuration access functions. They just check | |
14 | * alignment, do locking and call the low-level functions pointed to | |
15 | * by pci_dev->ops. | |
16 | */ | |
17 | ||
18 | #define PCI_byte_BAD 0 | |
19 | #define PCI_word_BAD (pos & 1) | |
20 | #define PCI_dword_BAD (pos & 3) | |
21 | ||
22 | #define PCI_OP_READ(size,type,len) \ | |
23 | int pci_bus_read_config_##size \ | |
24 | (struct pci_bus *bus, unsigned int devfn, int pos, type *value) \ | |
25 | { \ | |
26 | int res; \ | |
27 | unsigned long flags; \ | |
28 | u32 data = 0; \ | |
29 | if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \ | |
30 | spin_lock_irqsave(&pci_lock, flags); \ | |
31 | res = bus->ops->read(bus, devfn, pos, len, &data); \ | |
32 | *value = (type)data; \ | |
33 | spin_unlock_irqrestore(&pci_lock, flags); \ | |
34 | return res; \ | |
35 | } | |
36 | ||
37 | #define PCI_OP_WRITE(size,type,len) \ | |
38 | int pci_bus_write_config_##size \ | |
39 | (struct pci_bus *bus, unsigned int devfn, int pos, type value) \ | |
40 | { \ | |
41 | int res; \ | |
42 | unsigned long flags; \ | |
43 | if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \ | |
44 | spin_lock_irqsave(&pci_lock, flags); \ | |
45 | res = bus->ops->write(bus, devfn, pos, len, value); \ | |
46 | spin_unlock_irqrestore(&pci_lock, flags); \ | |
47 | return res; \ | |
48 | } | |
49 | ||
50 | PCI_OP_READ(byte, u8, 1) | |
51 | PCI_OP_READ(word, u16, 2) | |
52 | PCI_OP_READ(dword, u32, 4) | |
53 | PCI_OP_WRITE(byte, u8, 1) | |
54 | PCI_OP_WRITE(word, u16, 2) | |
55 | PCI_OP_WRITE(dword, u32, 4) | |
56 | ||
57 | EXPORT_SYMBOL(pci_bus_read_config_byte); | |
58 | EXPORT_SYMBOL(pci_bus_read_config_word); | |
59 | EXPORT_SYMBOL(pci_bus_read_config_dword); | |
60 | EXPORT_SYMBOL(pci_bus_write_config_byte); | |
61 | EXPORT_SYMBOL(pci_bus_write_config_word); | |
62 | EXPORT_SYMBOL(pci_bus_write_config_dword); |