null_pci.h

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#ifndef _IPXE_NULL_PCI_H
#define _IPXE_NULL_PCI_H

#include <stdint.h>

/** @file
 *
 * Null PCI API
 *
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

#ifdef PCIAPI_NULL
#define PCIAPI_PREFIX_null
#else
#define PCIAPI_PREFIX_null __null_
#endif

struct pci_device;

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

/**
 * Find next PCI bus:dev.fn address range in system
 *
 * @v busdevfn          Starting PCI bus:dev.fn address
 * @v range             PCI bus:dev.fn address range to fill in
 */
static inline __always_inline void
PCIAPI_INLINE ( null, pci_discover ) ( uint32_t busdevfn __unused,
                                       struct pci_range *range ) {

        range->start = 0;
        range->count = 0;
}

/**
 * Read byte from PCI configuration space via PCI BIOS
 *
 * @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 ( null, pci_read_config_byte ) ( struct pci_device *pci __unused,
                                               unsigned int where __unused,
                                               uint8_t *value ) {
        *value = 0xff;
        return 0;
}

/**
 * Read word from PCI configuration space via PCI BIOS
 *
 * @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 ( null, pci_read_config_word ) ( struct pci_device *pci __unused,
                                               unsigned int where __unused,
                                               uint16_t *value ) {
        *value = 0xffff;
        return 0;
}

/**
 * Read dword from PCI configuration space via PCI BIOS
 *
 * @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 ( null, pci_read_config_dword ) ( struct pci_device *pci __unused,
                                                unsigned int where __unused,
                                                uint32_t *value ) {
        *value = 0xffffffff;
        return 0;
}

/**
 * Write byte to PCI configuration space via PCI BIOS
 *
 * @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 ( null, pci_write_config_byte ) ( struct pci_device *pci __unused,
                                                unsigned int where __unused,
                                                uint8_t value __unused ) {
        return 0;
}

/**
 * Write word to PCI configuration space via PCI BIOS
 *
 * @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 ( null, pci_write_config_word ) ( struct pci_device *pci __unused,
                                                unsigned int where __unused,
                                                uint16_t value __unused ) {
        return 0;
}

/**
 * Write dword to PCI configuration space via PCI BIOS
 *
 * @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 ( null, pci_write_config_dword ) ( struct pci_device *pci
                                                 __unused,
                                                 unsigned int where __unused,
                                                 uint32_t value __unused ) {
        return 0;
}

/**
 * Map PCI bus address as an I/O address
 *
 * @v bus_addr          PCI bus address
 * @v len               Length of region
 * @ret io_addr         I/O address, or NULL on error
 */
static inline __always_inline void *
PCIAPI_INLINE ( null, pci_ioremap ) ( struct pci_device *pci __unused,
                                      unsigned long bus_addr __unused,
                                      size_t len __unused ) {
        return NULL;
}

#endif /* _IPXE_NULL_PCI_H */