efi_pci_api.h

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#ifndef _IPXE_EFI_PCI_API_H
#define _IPXE_EFI_PCI_API_H

/** @file
 *
 * iPXE PCI I/O API for EFI
 *
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

#ifdef PCIAPI_EFI
#define PCIAPI_PREFIX_efi
#else
#define PCIAPI_PREFIX_efi __efi_
#endif

/* EFI PCI width codes defined by EFI spec */
#define EFIPCI_WIDTH_BYTE 0
#define EFIPCI_WIDTH_WORD 1
#define EFIPCI_WIDTH_DWORD 2

#define EFIPCI_LOCATION( _offset, _width ) \
        ( (_offset) | ( (_width) << 16 ) )
#define EFIPCI_OFFSET( _location ) ( (_location) & 0xffff )
#define EFIPCI_WIDTH( _location ) ( (_location) >> 16 )

struct pci_device;

extern int efipci_read ( struct pci_device *pci, unsigned long location,
                         void *value );
extern int efipci_write ( struct pci_device *pci, unsigned long location,
                          unsigned long value );

/**
 * Check if PCI bus probing is allowed
 *
 * @ret ok              Bus probing is allowed
 */
static inline __always_inline int
PCIAPI_INLINE ( efi, pci_can_probe ) ( void ) {
        return 0;
}

/**
 * Read byte from PCI configuration space via EFI
 *
 * @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 ( efi, pci_read_config_byte ) ( struct pci_device *pci,
                                              unsigned int where,
                                              uint8_t *value ) {
        *value = 0xff;
        return efipci_read ( pci,
                             EFIPCI_LOCATION ( where, EFIPCI_WIDTH_BYTE ),
                             value );
}

/**
 * Read word from PCI configuration space via EFI
 *
 * @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 ( efi, pci_read_config_word ) ( struct pci_device *pci,
                                              unsigned int where,
                                              uint16_t *value ) {
        *value = 0xffff;
        return efipci_read ( pci,
                             EFIPCI_LOCATION ( where, EFIPCI_WIDTH_WORD ),
                             value );
}

/**
 * Read dword from PCI configuration space via EFI
 *
 * @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 ( efi, pci_read_config_dword ) ( struct pci_device *pci,
                                               unsigned int where,
                                               uint32_t *value ) {
        *value = 0xffffffffUL;
        return efipci_read ( pci,
                             EFIPCI_LOCATION ( where, EFIPCI_WIDTH_DWORD ),
                             value );
}

/**
 * Write byte to PCI configuration space via EFI
 *
 * @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 ( efi, pci_write_config_byte ) ( struct pci_device *pci,
                                               unsigned int where,
                                               uint8_t value ) {
        return efipci_write ( pci,
                              EFIPCI_LOCATION ( where, EFIPCI_WIDTH_BYTE ),
                              value );
}

/**
 * Write word to PCI configuration space via EFI
 *
 * @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 ( efi, pci_write_config_word ) ( struct pci_device *pci,
                                               unsigned int where,
                                               uint16_t value ) {
        return efipci_write ( pci,
                              EFIPCI_LOCATION ( where, EFIPCI_WIDTH_WORD ),
                              value );
}

/**
 * Write dword to PCI configuration space via EFI
 *
 * @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 ( efi, pci_write_config_dword ) ( struct pci_device *pci,
                                                unsigned int where,
                                                uint32_t value ) {
        return efipci_write ( pci,
                              EFIPCI_LOCATION ( where, EFIPCI_WIDTH_DWORD ),
                              value );
}

#endif /* _IPXE_EFI_PCI_API_H */