127 lines
3.2 KiB
C
127 lines
3.2 KiB
C
#ifndef _PCIDIRECT_H
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#define _PCIDIRECT_H
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#include <stdint.h>
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#include <io.h>
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/** @file
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*
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* PCI configuration space access via Type 1 accesses
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*
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*/
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#define PCIDIRECT_CONFIG_ADDRESS 0xcf8
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#define PCIDIRECT_CONFIG_DATA 0xcfc
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struct pci_device;
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extern void pcidirect_prepare ( struct pci_device *pci, int where );
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/**
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* Determine maximum PCI bus number within system
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*
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* @ret max_bus Maximum bus number
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*/
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static inline int pcidirect_max_bus ( void ) {
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/* No way to work this out via Type 1 accesses */
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return 0xff;
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}
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/**
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* Read byte from PCI configuration space via Type 1 access
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*
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* @v pci PCI device
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* @v where Location within PCI configuration space
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* @v value Value read
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* @ret rc Return status code
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*/
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static inline __attribute__ (( always_inline )) int
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pcidirect_read_config_byte ( struct pci_device *pci, unsigned int where,
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uint8_t *value ) {
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pcidirect_prepare ( pci, where );
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*value = inb ( PCIDIRECT_CONFIG_DATA + ( where & 3 ) );
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return 0;
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}
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/**
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* Read word from PCI configuration space via Type 1 access
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*
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* @v pci PCI device
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* @v where Location within PCI configuration space
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* @v value Value read
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* @ret rc Return status code
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*/
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static inline __attribute__ (( always_inline )) int
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pcidirect_read_config_word ( struct pci_device *pci, unsigned int where,
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uint16_t *value ) {
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pcidirect_prepare ( pci, where );
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*value = inw ( PCIDIRECT_CONFIG_DATA + ( where & 2 ) );
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return 0;
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}
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/**
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* Read dword from PCI configuration space via Type 1 access
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*
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* @v pci PCI device
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* @v where Location within PCI configuration space
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* @v value Value read
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* @ret rc Return status code
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*/
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static inline __attribute__ (( always_inline )) int
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pcidirect_read_config_dword ( struct pci_device *pci, unsigned int where,
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uint32_t *value ) {
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pcidirect_prepare ( pci, where );
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*value = inl ( PCIDIRECT_CONFIG_DATA );
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return 0;
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}
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/**
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* Write byte to PCI configuration space via Type 1 access
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*
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* @v pci PCI device
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* @v where Location within PCI configuration space
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* @v value Value to be written
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* @ret rc Return status code
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*/
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static inline __attribute__ (( always_inline )) int
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pcidirect_write_config_byte ( struct pci_device *pci, unsigned int where,
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uint8_t value ) {
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pcidirect_prepare ( pci, where );
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outb ( value, PCIDIRECT_CONFIG_DATA + ( where & 3 ) );
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return 0;
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}
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/**
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* Write word to PCI configuration space via Type 1 access
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*
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* @v pci PCI device
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* @v where Location within PCI configuration space
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* @v value Value to be written
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* @ret rc Return status code
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*/
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static inline __attribute__ (( always_inline )) int
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pcidirect_write_config_word ( struct pci_device *pci, unsigned int where,
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uint16_t value ) {
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pcidirect_prepare ( pci, where );
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outw ( value, PCIDIRECT_CONFIG_DATA + ( where & 2 ) );
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return 0;
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}
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/**
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* Write dword to PCI configuration space via Type 1 access
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*
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* @v pci PCI device
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* @v where Location within PCI configuration space
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* @v value Value to be written
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* @ret rc Return status code
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*/
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static inline __attribute__ (( always_inline )) int
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pcidirect_write_config_dword ( struct pci_device *pci, unsigned int where,
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uint32_t value ) {
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pcidirect_prepare ( pci, where );
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outl ( value, PCIDIRECT_CONFIG_DATA );
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return 0;
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}
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#endif /* _PCIDIRECT_H */
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