48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
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/*
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* File : io.h
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006, RT-Thread Develop Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://openlab.rt-thread.com/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2011-01-13 weety first version
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*/
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#ifndef __ASM_ARCH_IO_H
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#define __ASM_ARCH_IO_H
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#define AT91_BASE_SYS 0xffffe800
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#define IO_SPACE_LIMIT 0xFFFFFFFF
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#define readb(a) (*(volatile unsigned char *)(a))
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#define readw(a) (*(volatile unsigned short *)(a))
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#define readl(a) (*(volatile unsigned int *)(a))
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#define writeb(v,a) (*(volatile unsigned char *)(a) = (v))
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#define writew(v,a) (*(volatile unsigned short *)(a) = (v))
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#define writel(v,a) (*(volatile unsigned int *)(a) = (v))
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static inline unsigned int at91_sys_read(unsigned int reg_offset)
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{
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void *addr = (void *)AT91_BASE_SYS;
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return readl(addr + reg_offset);
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}
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static inline void at91_sys_write(unsigned int reg_offset, unsigned long value)
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{
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void *addr = (void *)AT91_BASE_SYS;
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writel(value, addr + reg_offset);
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}
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#endif
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