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[pci] Formalise the PCI I/O API

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This commit is contained in:
Michael Brown
2008-10-12 12:50:44 +01:00
parent fd67452807
commit 8a4ccebec9
10 changed files with 220 additions and 81 deletions
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139
src/arch/i386/include/gpxe/pcidirect.h Normal file
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#ifndef _PCIDIRECT_H
#define _PCIDIRECT_H
#include <stdint.h>
#include <gpxe/io.h>
#ifdef PCIAPI_DIRECT
#define PCIAPI_PREFIX_direct
#else
#define PCIAPI_PREFIX_direct __direct_
#endif
/** @file
*
* PCI configuration space access via Type 1 accesses
*
*/
#define PCIDIRECT_CONFIG_ADDRESS 0xcf8
#define PCIDIRECT_CONFIG_DATA 0xcfc
struct pci_device;
extern void pcidirect_prepare ( struct pci_device *pci, int where );
/**
* Determine maximum PCI bus number within system
*
* @ret max_bus Maximum bus number
*/
static inline __always_inline int
PCIAPI_INLINE ( direct, pci_max_bus ) ( void ) {
/* No way to work this out via Type 1 accesses */
return 0xff;
}
/**
* Read byte from PCI configuration space via Type 1 access
*
* @v pci PCI device
* @v where Location within PCI configuration space
* @v value Value read
* @ret rc Return status code
*/
static inline __always_inline int
PCIAPI_INLINE ( direct, pci_read_config_byte ) ( struct pci_device *pci,
unsigned int where,
uint8_t *value ) {
pcidirect_prepare ( pci, where );
*value = inb ( PCIDIRECT_CONFIG_DATA + ( where & 3 ) );
return 0;
}
/**
* Read word from PCI configuration space via Type 1 access
*
* @v pci PCI device
* @v where Location within PCI configuration space
* @v value Value read
* @ret rc Return status code
*/
static inline __always_inline int
PCIAPI_INLINE ( direct, pci_read_config_word ) ( struct pci_device *pci,
unsigned int where,
uint16_t *value ) {
pcidirect_prepare ( pci, where );
*value = inw ( PCIDIRECT_CONFIG_DATA + ( where & 2 ) );
return 0;
}
/**
* Read dword from PCI configuration space via Type 1 access
*
* @v pci PCI device
* @v where Location within PCI configuration space
* @v value Value read
* @ret rc Return status code
*/
static inline __always_inline int
PCIAPI_INLINE ( direct, pci_read_config_dword ) ( struct pci_device *pci,
unsigned int where,
uint32_t *value ) {
pcidirect_prepare ( pci, where );
*value = inl ( PCIDIRECT_CONFIG_DATA );
return 0;
}
/**
* Write byte to PCI configuration space via Type 1 access
*
* @v pci PCI device
* @v where Location within PCI configuration space
* @v value Value to be written
* @ret rc Return status code
*/
static inline __always_inline int
PCIAPI_INLINE ( direct, pci_write_config_byte ) ( struct pci_device *pci,
unsigned int where,
uint8_t value ) {
pcidirect_prepare ( pci, where );
outb ( value, PCIDIRECT_CONFIG_DATA + ( where & 3 ) );
return 0;
}
/**
* Write word to PCI configuration space via Type 1 access
*
* @v pci PCI device
* @v where Location within PCI configuration space
* @v value Value to be written
* @ret rc Return status code
*/
static inline __always_inline int
PCIAPI_INLINE ( direct, pci_write_config_word ) ( struct pci_device *pci,
unsigned int where,
uint16_t value ) {
pcidirect_prepare ( pci, where );
outw ( value, PCIDIRECT_CONFIG_DATA + ( where & 2 ) );
return 0;
}
/**
* Write dword to PCI configuration space via Type 1 access
*
* @v pci PCI device
* @v where Location within PCI configuration space
* @v value Value to be written
* @ret rc Return status code
*/
static inline __always_inline int
PCIAPI_INLINE ( direct, pci_write_config_dword ) ( struct pci_device *pci,
unsigned int where,
uint32_t value ) {
pcidirect_prepare ( pci, where );
outl ( value, PCIDIRECT_CONFIG_DATA );
return 0;
}
#endif /* _PCIDIRECT_H */