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[ioapi] Centralise definitions for dummy PIO 

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>
pull/820/head
Michael Brown 2023-06-29 15:08:23 +01:00
parent 18af669701
commit c57887bfc8
3 changed files with 70 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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 */

64
src/include/ipxe/dummy_pio.h 100644
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 */