106 lines
2.3 KiB
C
106 lines
2.3 KiB
C
#ifndef _IPXE_ARM_IO_H
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#define _IPXE_ARM_IO_H
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/** @file
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*
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* iPXE I/O API for ARM
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#ifdef IOAPI_ARM
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#define IOAPI_PREFIX_arm
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#else
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#define IOAPI_PREFIX_arm __arm_
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#endif
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/*
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* Memory space mappings
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*
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*/
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/** Page shift */
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#define PAGE_SHIFT 12
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/*
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* Physical<->Bus address mappings
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*
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*/
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static inline __always_inline unsigned long
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IOAPI_INLINE ( arm, phys_to_bus ) ( unsigned long phys_addr ) {
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return phys_addr;
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}
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static inline __always_inline unsigned long
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IOAPI_INLINE ( arm, bus_to_phys ) ( unsigned long bus_addr ) {
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return bus_addr;
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}
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/*
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* MMIO reads and writes up to native word size
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*
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*/
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#define ARM_READX( _api_func, _type, _insn_suffix, _reg_prefix ) \
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static inline __always_inline _type \
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IOAPI_INLINE ( arm, _api_func ) ( volatile _type *io_addr ) { \
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_type data; \
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__asm__ __volatile__ ( "ldr" _insn_suffix " %" _reg_prefix "0, %1" \
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: "=r" ( data ) : "Qo" ( *io_addr ) ); \
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return data; \
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}
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#ifdef __aarch64__
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ARM_READX ( readb, uint8_t, "b", "w" );
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ARM_READX ( readw, uint16_t, "h", "w" );
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ARM_READX ( readl, uint32_t, "", "w" );
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ARM_READX ( readq, uint64_t, "", "" );
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#else
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ARM_READX ( readb, uint8_t, "b", "" );
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ARM_READX ( readw, uint16_t, "h", "" );
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ARM_READX ( readl, uint32_t, "", "" );
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#endif
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#define ARM_WRITEX( _api_func, _type, _insn_suffix, _reg_prefix ) \
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static inline __always_inline void \
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IOAPI_INLINE ( arm, _api_func ) ( _type data, volatile _type *io_addr ) { \
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__asm__ __volatile__ ( "str" _insn_suffix " %" _reg_prefix "0, %1" \
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: : "r" ( data ), "Qo" ( *io_addr ) ); \
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}
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#ifdef __aarch64__
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ARM_WRITEX ( writeb, uint8_t, "b", "w" );
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ARM_WRITEX ( writew, uint16_t, "h", "w" );
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ARM_WRITEX ( writel, uint32_t, "", "w" );
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ARM_WRITEX ( writeq, uint64_t, "", "" );
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#else
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ARM_WRITEX ( writeb, uint8_t, "b", "" );
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ARM_WRITEX ( writew, uint16_t, "h", "" );
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ARM_WRITEX ( writel, uint32_t, "", "" );
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#endif
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/*
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* Slow down I/O
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*
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*/
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static inline __always_inline void
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IOAPI_INLINE ( arm, iodelay ) ( void ) {
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/* Nothing to do */
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}
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/*
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* Memory barrier
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*
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*/
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static inline __always_inline void
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IOAPI_INLINE ( arm, mb ) ( void ) {
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#ifdef __aarch64__
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__asm__ __volatile__ ( "dmb sy" );
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#else
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__asm__ __volatile__ ( "dmb" );
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#endif
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}
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#endif /* _IPXE_ARM_IO_H */
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