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[loong64] Add I/O API for LoongArch64

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Signed-off-by: Xiaotian Wu <wuxiaotian@loongson.cn>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Xiaotian Wu
2023-06-29 15:30:08 +01:00
committed by Michael Brown
parent c57887bfc8
commit 0c67a3632d
3 changed files with 130 additions and 0 deletions
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2
src/arch/loong64/include/bits/io.h
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@@ -12,4 +12,6 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/** Page shift */
#define PAGE_SHIFT 12
#include <ipxe/loong64_io.h>
#endif /* _BITS_IO_H */

82
src/arch/loong64/include/ipxe/loong64_io.h Normal file
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@@ -0,0 +1,82 @@
#ifndef _IPXE_LOONG64_IO_H
#define _IPXE_LOONG64_IO_H
/** @file
*
* iPXE I/O API for LoongArch64
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#ifdef IOAPI_LOONG64
#define IOAPI_PREFIX_loong64
#else
#define IOAPI_PREFIX_loong64 __loong64_
#endif
#include <ipxe/dummy_pio.h>
/*
* Memory space mappings
*
*/
/*
* Physical<->Bus address mappings
*
*/
static inline __always_inline unsigned long
IOAPI_INLINE ( loong64, phys_to_bus ) ( unsigned long phys_addr ) {
return phys_addr;
}
static inline __always_inline unsigned long
IOAPI_INLINE ( loong64, bus_to_phys ) ( unsigned long bus_addr ) {
return bus_addr;
}
/*
* MMIO reads and writes up to native word size
*
*/
#define LOONG64_READX( _suffix, _type, _insn_suffix ) \
static inline __always_inline _type \
IOAPI_INLINE ( loong64, read ## _suffix ) ( volatile _type *io_addr ) { \
_type data; \
__asm__ __volatile__ ( "ld." _insn_suffix " %0, %1" \
: "=r" ( data ) : "m" ( *io_addr ) ); \
return data; \
}
LOONG64_READX ( b, uint8_t, "bu");
LOONG64_READX ( w, uint16_t, "hu");
LOONG64_READX ( l, uint32_t, "wu");
LOONG64_READX ( q, uint64_t, "d");
#define LOONG64_WRITEX( _suffix, _type, _insn_suffix ) \
static inline __always_inline void \
IOAPI_INLINE ( loong64, write ## _suffix ) ( _type data, \
volatile _type *io_addr ) { \
__asm__ __volatile__ ( "st." _insn_suffix " %0, %1" \
: : "r" ( data ), "m" ( *io_addr ) ); \
}
LOONG64_WRITEX ( b, uint8_t, "b");
LOONG64_WRITEX ( w, uint16_t, "h");
LOONG64_WRITEX ( l, uint32_t, "w" );
LOONG64_WRITEX ( q, uint64_t, "d");
/*
* Memory barrier
*
*/
static inline __always_inline void
IOAPI_INLINE ( loong64, mb ) ( void ) {
__asm__ __volatile__ ( "dbar 0" );
}
/* Dummy PIO */
DUMMY_PIO ( loong64 );
#endif /* _IPXE_LOONG64_IO_H */