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[ioapi] Centralise definitions for dummy PIO

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There is no common standard for I/O-space access for non-x86 CPU
families, and non-MMIO peripherals are vanishingly rare.

Generalise the existing ARM definitions for dummy PIO to allow for
reuse by other CPU architectures.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2023-06-29 15:08:23 +01:00
parent 18af669701
commit c57887bfc8
3 changed files with 70 additions and 50 deletions
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64
src/include/ipxe/dummy_pio.h Normal file
View File

@@ -0,0 +1,64 @@
#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 */