dummy_pio.h

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#ifndef _IPXE_DUMMY_PIO_H
#define _IPXE_DUMMY_PIO_H

/** @file
 *
 * Dummy PIO reads and writes up to 32 bits
 *
 * There is no common standard for I/O-space access for non-x86 CPU
 * families, and non-MMIO peripherals are vanishingly rare.  Provide
 * dummy implementations that will allow code to link and should cause
 * drivers to simply fail to detect hardware at runtime.
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

#define DUMMY_INX( _prefix, _suffix, _type )                                  \
static inline __always_inline _type                                           \
IOAPI_INLINE ( _prefix, in ## _suffix ) ( volatile _type *io_addr __unused) { \
        return ~( (_type) 0 );                                                \
}                                                                             \
static inline __always_inline void                                            \
IOAPI_INLINE ( _prefix, ins ## _suffix ) ( volatile _type *io_addr __unused,  \
                                           _type *data, unsigned int count ) {\
        memset ( data, 0xff, count * sizeof ( *data ) );                      \
}

#define DUMMY_OUTX( _prefix, _suffix, _type )                                 \
static inline __always_inline void                                            \
IOAPI_INLINE ( _prefix, out ## _suffix ) ( _type data __unused,               \
                                           volatile _type *io_addr __unused ){\
        /* Do nothing */                                                      \
}                                                                             \
static inline __always_inline void                                            \
IOAPI_INLINE ( _prefix, outs ## _suffix ) ( volatile _type *io_addr __unused, \
                                            const _type *data __unused,       \
                                            unsigned int count __unused ) {   \
        /* Do nothing */                                                      \
}

#define DUMMY_IODELAY( _prefix )                                              \
static inline __always_inline void                                            \
IOAPI_INLINE ( _prefix, iodelay ) ( void ) {                                  \
        /* Nothing to do */                                                   \
}

#define DUMMY_PIO( _prefix )                                                  \
        DUMMY_INX ( _prefix, b, uint8_t );                                    \
        DUMMY_INX ( _prefix, w, uint16_t );                                   \
        DUMMY_INX ( _prefix, l, uint32_t );                                   \
        DUMMY_OUTX ( _prefix, b, uint8_t );                                   \
        DUMMY_OUTX ( _prefix, w, uint16_t );                                  \
        DUMMY_OUTX ( _prefix, l, uint32_t );                                  \
        DUMMY_IODELAY ( _prefix );

#define PROVIDE_DUMMY_PIO( _prefix )                                          \
        PROVIDE_IOAPI_INLINE ( _prefix, inb );                                \
        PROVIDE_IOAPI_INLINE ( _prefix, inw );                                \
        PROVIDE_IOAPI_INLINE ( _prefix, inl );                                \
        PROVIDE_IOAPI_INLINE ( _prefix, outb );                               \
        PROVIDE_IOAPI_INLINE ( _prefix, outw );                               \
        PROVIDE_IOAPI_INLINE ( _prefix, outl );                               \
        PROVIDE_IOAPI_INLINE ( _prefix, iodelay );

#endif /* _IPXE_DUMMY_PIO_H */