mirror of https://github.com/ipxe/ipxe.git
140 lines
3.7 KiB
C
140 lines
3.7 KiB
C
#ifndef _IPXE_ECAM_IO_H
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#define _IPXE_ECAM_IO_H
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/** @file
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*
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* PCI I/O API for Enhanced Configuration Access Mechanism (ECAM)
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <stdint.h>
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#ifdef PCIAPI_ECAM
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#define PCIAPI_PREFIX_ecam
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#else
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#define PCIAPI_PREFIX_ecam __ecam_
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#endif
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struct pci_device;
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/** Construct ECAM location */
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#define ECAM_LOC( where, len ) ( ( (len) << 16 ) | where )
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/** Extract offset from ECAM location */
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#define ECAM_WHERE( location ) ( (location) & 0xffff )
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/** Extract length from ECAM location */
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#define ECAM_LEN( location ) ( (location) >> 16 )
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extern int ecam_read ( struct pci_device *pci, unsigned int location,
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void *value );
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extern int ecam_write ( struct pci_device *pci, unsigned int location,
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unsigned long value );
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/**
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* Read byte from PCI configuration space via ECAM
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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 __always_inline int
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PCIAPI_INLINE ( ecam, pci_read_config_byte ) ( struct pci_device *pci,
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unsigned int where,
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uint8_t *value ) {
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return ecam_read ( pci, ECAM_LOC ( where, sizeof ( *value ) ), value );
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}
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/**
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* Read word from PCI configuration space via ECAM
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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 __always_inline int
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PCIAPI_INLINE ( ecam, pci_read_config_word ) ( struct pci_device *pci,
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unsigned int where,
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uint16_t *value ) {
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return ecam_read ( pci, ECAM_LOC ( where, sizeof ( *value ) ), value );
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}
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/**
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* Read dword from PCI configuration space via ECAM
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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 __always_inline int
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PCIAPI_INLINE ( ecam, pci_read_config_dword ) ( struct pci_device *pci,
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unsigned int where,
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uint32_t *value ) {
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return ecam_read ( pci, ECAM_LOC ( where, sizeof ( *value ) ), value );
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}
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/**
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* Write byte to PCI configuration space via ECAM
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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 __always_inline int
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PCIAPI_INLINE ( ecam, pci_write_config_byte ) ( struct pci_device *pci,
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unsigned int where,
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uint8_t value ) {
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return ecam_write ( pci, ECAM_LOC ( where, sizeof ( value ) ), value );
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}
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/**
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* Write word to PCI configuration space via ECAM
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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 __always_inline int
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PCIAPI_INLINE ( ecam, pci_write_config_word ) ( struct pci_device *pci,
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unsigned int where,
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uint16_t value ) {
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return ecam_write ( pci, ECAM_LOC ( where, sizeof ( value ) ), value );
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}
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/**
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* Write dword to PCI configuration space via ECAM
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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 __always_inline int
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PCIAPI_INLINE ( ecam, pci_write_config_dword ) ( struct pci_device *pci,
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unsigned int where,
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uint32_t value ) {
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return ecam_write ( pci, ECAM_LOC ( where, sizeof ( value ) ), value );
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}
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/**
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* Map PCI bus address as an I/O address
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*
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* @v bus_addr PCI bus address
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* @v len Length of region
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* @ret io_addr I/O address, or NULL on error
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*/
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static inline __always_inline void *
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PCIAPI_INLINE ( ecam, pci_ioremap ) ( struct pci_device *pci __unused,
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unsigned long bus_addr, size_t len ) {
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return ioremap ( bus_addr, len );
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}
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#endif /* _IPXE_ECAM_IO_H */
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