rt-thread/libcpu/arm/at91sam926x/io.h

/*
 * File      : io.h
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006, RT-Thread Develop Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://openlab.rt-thread.com/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2011-01-13     weety      first version
 */

#ifndef __ASM_ARCH_IO_H
#define __ASM_ARCH_IO_H

#define AT91_BASE_SYS			0xffffe800

#define IO_SPACE_LIMIT		0xFFFFFFFF

#define readb(a)	(*(volatile unsigned char  *)(a))
#define readw(a)	(*(volatile unsigned short *)(a))
#define readl(a)	(*(volatile unsigned int   *)(a))

#define writeb(v,a)	(*(volatile unsigned char  *)(a) = (v))
#define writew(v,a)	(*(volatile unsigned short *)(a) = (v))
#define writel(v,a)	(*(volatile unsigned int   *)(a) = (v))


static inline unsigned int at91_sys_read(unsigned int reg_offset)
{
	void  *addr = (void  *)AT91_BASE_SYS;

	return readl(addr + reg_offset);
}

static inline void at91_sys_write(unsigned int reg_offset, unsigned long value)
{
	void *addr = (void *)AT91_BASE_SYS;

	writel(value, addr + reg_offset);
}


#endif