You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
63 lines
1.7 KiB
63 lines
1.7 KiB
20 years ago
|
#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);
|