1 #ifndef _GPXE_EFI_PCI_H 2 #define _GPXE_EFI_PCI_H 3 4 /** @file 5 * 6 * gPXE PCI I/O API for EFI 7 * 8 */ 9 10 FILE_LICENCE ( GPL2_OR_LATER ); 11 12 #ifdef PCIAPI_EFI 13 #define PCIAPI_PREFIX_efi 14 #else 15 #define PCIAPI_PREFIX_efi __efi_ 16 #endif 17 18 /* EFI PCI width codes defined by EFI spec */ 19 #define EFIPCI_WIDTH_BYTE 0 20 #define EFIPCI_WIDTH_WORD 1 21 #define EFIPCI_WIDTH_DWORD 2 22 23 #define EFIPCI_LOCATION( _offset, _width ) \ 24 ( (_offset) | ( (_width) << 16 ) ) 25 #define EFIPCI_OFFSET( _location ) ( (_location) & 0xffff ) 26 #define EFIPCI_WIDTH( _location ) ( (_location) >> 16 ) 27 28 struct pci_device; 29 30 extern int efipci_read ( struct pci_device *pci, unsigned long location, 31 void *value ); 32 extern int efipci_write ( struct pci_device *pci, unsigned long location, 33 unsigned long value ); 34 35 /** 36 * Determine maximum PCI bus number within system 37 * 38 * @ret max_bus Maximum bus number 39 */ 40 static inline __always_inline int 41 PCIAPI_INLINE ( efi, pci_max_bus ) ( void ) { 42 /* No way to work this out via EFI */ 43 return 0xff; 44 } 45 46 /** 47 * Read byte from PCI configuration space via EFI 48 * 49 * @v pci PCI device 50 * @v where Location within PCI configuration space 51 * @v value Value read 52 * @ret rc Return status code 53 */ 54 static inline __always_inline int 55 PCIAPI_INLINE ( efi, pci_read_config_byte ) ( struct pci_device *pci, 56 unsigned int where, 57 uint8_t *value ) { 58 return efipci_read ( pci, 59 EFIPCI_LOCATION ( where, EFIPCI_WIDTH_BYTE ), 60 value ); 61 } 62 63 /** 64 * Read word from PCI configuration space via EFI 65 * 66 * @v pci PCI device 67 * @v where Location within PCI configuration space 68 * @v value Value read 69 * @ret rc Return status code 70 */ 71 static inline __always_inline int 72 PCIAPI_INLINE ( efi, pci_read_config_word ) ( struct pci_device *pci, 73 unsigned int where, 74 uint16_t *value ) { 75 return efipci_read ( pci, 76 EFIPCI_LOCATION ( where, EFIPCI_WIDTH_WORD ), 77 value ); 78 } 79 80 /** 81 * Read dword from PCI configuration space via EFI 82 * 83 * @v pci PCI device 84 * @v where Location within PCI configuration space 85 * @v value Value read 86 * @ret rc Return status code 87 */ 88 static inline __always_inline int 89 PCIAPI_INLINE ( efi, pci_read_config_dword ) ( struct pci_device *pci, 90 unsigned int where, 91 uint32_t *value ) { 92 return efipci_read ( pci, 93 EFIPCI_LOCATION ( where, EFIPCI_WIDTH_DWORD ), 94 value ); 95 } 96 97 /** 98 * Write byte to PCI configuration space via EFI 99 * 100 * @v pci PCI device 101 * @v where Location within PCI configuration space 102 * @v value Value to be written 103 * @ret rc Return status code 104 */ 105 static inline __always_inline int 106 PCIAPI_INLINE ( efi, pci_write_config_byte ) ( struct pci_device *pci, 107 unsigned int where, 108 uint8_t value ) { 109 return efipci_write ( pci, 110 EFIPCI_LOCATION ( where, EFIPCI_WIDTH_BYTE ), 111 value ); 112 } 113 114 /** 115 * Write word to PCI configuration space via EFI 116 * 117 * @v pci PCI device 118 * @v where Location within PCI configuration space 119 * @v value Value to be written 120 * @ret rc Return status code 121 */ 122 static inline __always_inline int 123 PCIAPI_INLINE ( efi, pci_write_config_word ) ( struct pci_device *pci, 124 unsigned int where, 125 uint16_t value ) { 126 return efipci_write ( pci, 127 EFIPCI_LOCATION ( where, EFIPCI_WIDTH_WORD ), 128 value ); 129 } 130 131 /** 132 * Write dword to PCI configuration space via EFI 133 * 134 * @v pci PCI device 135 * @v where Location within PCI configuration space 136 * @v value Value to be written 137 * @ret rc Return status code 138 */ 139 static inline __always_inline int 140 PCIAPI_INLINE ( efi, pci_write_config_dword ) ( struct pci_device *pci, 141 unsigned int where, 142 uint32_t value ) { 143 return efipci_write ( pci, 144 EFIPCI_LOCATION ( where, EFIPCI_WIDTH_DWORD ), 145 value ); 146 } 147 148 #endif /* _GPXE_EFI_PCI_H */ 149
