mirror of https://github.com/ipxe/ipxe.git
152 lines
3.8 KiB
C
152 lines
3.8 KiB
C
#ifndef _IPXE_EFI_PCI_API_H
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#define _IPXE_EFI_PCI_API_H
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/** @file
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*
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* iPXE PCI I/O API for EFI
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#ifdef PCIAPI_EFI
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#define PCIAPI_PREFIX_efi
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#else
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#define PCIAPI_PREFIX_efi __efi_
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#endif
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/* EFI PCI width codes defined by EFI spec */
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#define EFIPCI_WIDTH_BYTE 0
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#define EFIPCI_WIDTH_WORD 1
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#define EFIPCI_WIDTH_DWORD 2
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#define EFIPCI_LOCATION( _offset, _width ) \
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( (_offset) | ( (_width) << 16 ) )
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#define EFIPCI_OFFSET( _location ) ( (_location) & 0xffff )
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#define EFIPCI_WIDTH( _location ) ( (_location) >> 16 )
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struct pci_device;
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extern int efipci_read ( struct pci_device *pci, unsigned long location,
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void *value );
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extern int efipci_write ( struct pci_device *pci, unsigned long location,
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unsigned long value );
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/**
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* Determine number of PCI buses within system
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*
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* @ret num_bus Number of buses
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*/
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static inline __always_inline int
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PCIAPI_INLINE ( efi, pci_num_bus ) ( void ) {
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/* EFI does not want us to scan the PCI bus ourselves */
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return 0;
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}
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/**
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* Read byte from PCI configuration space via EFI
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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 ( efi, 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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*value = 0xff;
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return efipci_read ( pci,
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EFIPCI_LOCATION ( where, EFIPCI_WIDTH_BYTE ),
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value );
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}
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/**
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* Read word from PCI configuration space via EFI
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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 ( efi, 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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*value = 0xffff;
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return efipci_read ( pci,
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EFIPCI_LOCATION ( where, EFIPCI_WIDTH_WORD ),
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value );
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}
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/**
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* Read dword from PCI configuration space via EFI
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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 ( efi, 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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*value = 0xffffffffUL;
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return efipci_read ( pci,
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EFIPCI_LOCATION ( where, EFIPCI_WIDTH_DWORD ),
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value );
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}
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/**
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* Write byte to PCI configuration space via EFI
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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 ( efi, 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 efipci_write ( pci,
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EFIPCI_LOCATION ( where, EFIPCI_WIDTH_BYTE ),
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value );
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}
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/**
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* Write word to PCI configuration space via EFI
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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 ( efi, 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 efipci_write ( pci,
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EFIPCI_LOCATION ( where, EFIPCI_WIDTH_WORD ),
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value );
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}
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/**
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* Write dword to PCI configuration space via EFI
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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 ( efi, 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 efipci_write ( pci,
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EFIPCI_LOCATION ( where, EFIPCI_WIDTH_DWORD ),
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value );
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}
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#endif /* _IPXE_EFI_PCI_API_H */
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