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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 428 | giacomo | 1 | #include <linux/pci.h> |
| 2 | #include <linux/module.h> |
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| 3 | #include <linux/ioport.h> |
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| 4 | |||
| 5 | /* |
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| 6 | * This interrupt-safe spinlock protects all accesses to PCI |
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| 7 | * configuration space. |
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| 8 | */ |
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| 9 | |||
| 10 | static spinlock_t pci_lock = SPIN_LOCK_UNLOCKED; |
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| 11 | |||
| 12 | /* |
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| 13 | * Wrappers for all PCI configuration access functions. They just check |
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| 14 | * alignment, do locking and call the low-level functions pointed to |
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| 15 | * by pci_dev->ops. |
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| 16 | */ |
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| 17 | |||
| 18 | #define PCI_byte_BAD 0 |
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| 19 | #define PCI_word_BAD (pos & 1) |
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| 20 | #define PCI_dword_BAD (pos & 3) |
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| 21 | |||
| 22 | #define PCI_OP_READ(size,type,len) \ |
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| 23 | int pci_bus_read_config_##size \ |
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| 24 | (struct pci_bus *bus, unsigned int devfn, int pos, type *value) \ |
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| 25 | { \ |
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| 26 | int res; \ |
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| 27 | unsigned long flags; \ |
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| 28 | u32 data = 0; \ |
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| 29 | if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \ |
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| 30 | spin_lock_irqsave(&pci_lock, flags); \ |
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| 31 | res = bus->ops->read(bus, devfn, pos, len, &data); \ |
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| 32 | *value = (type)data; \ |
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| 33 | spin_unlock_irqrestore(&pci_lock, flags); \ |
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| 34 | return res; \ |
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| 35 | } |
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| 36 | |||
| 37 | #define PCI_OP_WRITE(size,type,len) \ |
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| 38 | int pci_bus_write_config_##size \ |
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| 39 | (struct pci_bus *bus, unsigned int devfn, int pos, type value) \ |
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| 40 | { \ |
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| 41 | int res; \ |
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| 42 | unsigned long flags; \ |
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| 43 | if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \ |
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| 44 | spin_lock_irqsave(&pci_lock, flags); \ |
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| 45 | res = bus->ops->write(bus, devfn, pos, len, value); \ |
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| 46 | spin_unlock_irqrestore(&pci_lock, flags); \ |
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| 47 | return res; \ |
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| 48 | } |
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| 49 | |||
| 50 | PCI_OP_READ(byte, u8, 1) |
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| 51 | PCI_OP_READ(word, u16, 2) |
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| 52 | PCI_OP_READ(dword, u32, 4) |
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| 53 | PCI_OP_WRITE(byte, u8, 1) |
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| 54 | PCI_OP_WRITE(word, u16, 2) |
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| 55 | PCI_OP_WRITE(dword, u32, 4) |
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| 56 | |||
| 57 | EXPORT_SYMBOL(pci_bus_read_config_byte); |
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| 58 | EXPORT_SYMBOL(pci_bus_read_config_word); |
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| 59 | EXPORT_SYMBOL(pci_bus_read_config_dword); |
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| 60 | EXPORT_SYMBOL(pci_bus_write_config_byte); |
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| 61 | EXPORT_SYMBOL(pci_bus_write_config_word); |
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| 62 | EXPORT_SYMBOL(pci_bus_write_config_dword); |