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* Originally imported from linux/include/asm-arm/io.h. This file has changed
* substantially since then.
* Copyright 2013 Google Inc.
* Copyright (C) 1996-2000 Russell King
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
* Modifications:
* 08-Apr-2013 G Replaced several macros with inlines for type safety.
* 16-Sep-1996 RMK Inlined the inx/outx functions & optimised for both
* constant addresses and variable addresses.
* 04-Dec-1997 RMK Moved a lot of this stuff to the new architecture
* specific IO header files.
* 27-Mar-1999 PJB Second parameter of memcpy_toio is const..
* 04-Apr-1999 PJB Added check_signature.
* 12-Dec-1999 RMK More cleanups
* 18-Jun-2000 RMK Removed virt_to_* and friends definitions
#ifndef __ASM_ARM_ARCH_IO_H
#define __ASM_ARM_ARCH_IO_H
#include <stdint.h>
static inline uint8_t read8(const void *addr)
return *(volatile uint8_t *)addr;
static inline uint16_t read16(const void *addr)
return *(volatile uint16_t *)addr;
static inline uint32_t read32(const void *addr)
return *(volatile uint32_t *)addr;
static inline void write8(uint8_t val, void *addr)
*(volatile uint8_t *)addr = val;
static inline void write16(uint16_t val, void *addr)
*(volatile uint16_t *)addr = val;
static inline void write32(uint32_t val, void *addr)
*(volatile uint32_t *)addr = val;
#endif /* __ASM_ARM_ARCH_IO_H */