Pull sn_pci_legacy_read-write into release branch
[linux-2.6] / drivers / pci / access.c
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);