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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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2
src/arch/arm/core/arm_io.c
View File

@@ -83,7 +83,6 @@ PROVIDE_IOAPI_INLINE ( arm, readl );
PROVIDE_IOAPI_INLINE ( arm, writeb );
PROVIDE_IOAPI_INLINE ( arm, writew );
PROVIDE_IOAPI_INLINE ( arm, writel );
PROVIDE_IOAPI_INLINE ( arm, iodelay );
PROVIDE_IOAPI_INLINE ( arm, mb );
#ifdef __aarch64__
PROVIDE_IOAPI_INLINE ( arm, readq );
@@ -92,3 +91,4 @@ PROVIDE_IOAPI_INLINE ( arm, writeq );
PROVIDE_IOAPI ( arm, readq, arm32_readq );
PROVIDE_IOAPI ( arm, writeq, arm32_writeq );
#endif
PROVIDE_DUMMY_PIO ( arm );

54
src/arch/arm/include/ipxe/arm_io.h
View File

@@ -15,6 +15,8 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#define IOAPI_PREFIX_arm __arm_
#endif
#include <ipxe/dummy_pio.h>
/*
* Memory space mappings
*
@@ -77,55 +79,6 @@ ARM_WRITEX ( w, uint16_t, "h", "" );
ARM_WRITEX ( l, uint32_t, "", "" );
#endif
/*
* Dummy PIO reads and writes up to 32 bits
*
* There is no common standard for I/O-space access for ARM, 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.
*
*/
#define ARM_INX( _suffix, _type ) \
static inline __always_inline _type \
IOAPI_INLINE ( arm, in ## _suffix ) ( volatile _type *io_addr __unused) { \
return ~( (_type) 0 ); \
} \
static inline __always_inline void \
IOAPI_INLINE ( arm, ins ## _suffix ) ( volatile _type *io_addr __unused, \
_type *data, unsigned int count ) { \
memset ( data, 0xff, count * sizeof ( *data ) ); \
}
ARM_INX ( b, uint8_t );
ARM_INX ( w, uint16_t );
ARM_INX ( l, uint32_t );
#define ARM_OUTX( _suffix, _type ) \
static inline __always_inline void \
IOAPI_INLINE ( arm, out ## _suffix ) ( _type data __unused, \
volatile _type *io_addr __unused ) { \
/* Do nothing */ \
} \
static inline __always_inline void \
IOAPI_INLINE ( arm, outs ## _suffix ) ( volatile _type *io_addr __unused, \
const _type *data __unused, \
unsigned int count __unused ) { \
/* Do nothing */ \
}
ARM_OUTX ( b, uint8_t );
ARM_OUTX ( w, uint16_t );
ARM_OUTX ( l, uint32_t );
/*
* Slow down I/O
*
*/
static inline __always_inline void
IOAPI_INLINE ( arm, iodelay ) ( void ) {
/* Nothing to do */
}
/*
* Memory barrier
*
@@ -140,4 +93,7 @@ IOAPI_INLINE ( arm, mb ) ( void ) {
#endif
}
/* Dummy PIO */
DUMMY_PIO ( arm );
#endif /* _IPXE_ARM_IO_H */