#include <linux/pci.h> #include <linux/module.h> #include <linux/ioport.h> /* * This interrupt-safe spinlock protects all accesses to PCI * configuration space. */ static DEFINE_SPINLOCK(pci_lock); /* * Wrappers for all PCI configuration access functions. They just check * alignment, do locking and call the low-level functions pointed to * by pci_dev->ops. */ #define PCI_byte_BAD 0 #define PCI_word_BAD (pos & 1) #define PCI_dword_BAD (pos & 3) #define PCI_OP_READ(size,type,len) \ int pci_bus_read_config_##size \ (struct pci_bus *bus, unsigned int devfn, int pos, type *value) \ { \ int res; \ unsigned long flags; \ u32 data = 0; \ if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \ spin_lock_irqsave(&pci_lock, flags); \ res = bus->ops->read(bus, devfn, pos, len, &data); \ *value = (type)data; \ spin_unlock_irqrestore(&pci_lock, flags); \ return res; \ } #define PCI_OP_WRITE(size,type,len) \ int pci_bus_write_config_##size \ (struct pci_bus *bus, unsigned int devfn, int pos, type value) \ { \ int res; \ unsigned long flags; \ if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \ spin_lock_irqsave(&pci_lock, flags); \ res = bus->ops->write(bus, devfn, pos, len, value); \ spin_unlock_irqrestore(&pci_lock, flags); \ return res; \ } PCI_OP_READ(byte, u8, 1) PCI_OP_READ(word, u16, 2) PCI_OP_READ(dword, u32, 4) PCI_OP_WRITE(byte, u8, 1) PCI_OP_WRITE(word, u16, 2) PCI_OP_WRITE(dword, u32, 4) EXPORT_SYMBOL(pci_bus_read_config_byte); EXPORT_SYMBOL(pci_bus_read_config_word); EXPORT_SYMBOL(pci_bus_read_config_dword); EXPORT_SYMBOL(pci_bus_write_config_byte); EXPORT_SYMBOL(pci_bus_write_config_word); EXPORT_SYMBOL(pci_bus_write_config_dword);