power.c

一个2.4.21版本的嵌入式linux内核

/*
 *  arch/mips/philips/nino/power.c
 *
 *  Copyright (C) 2000 Jim Pick <[e-mail]>
 *  Copyright (C) 2001 Steven J. Hill ([e-mail])
 *
 * 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.
 *
 *  Power management routines for the Philips Nino
 */
#include <asm/io.h>
#include <asm/tx3912.h>

void nino_wait(void)
{
	/* We stop the CPU to conserve power */
	outl(inl(TX3912_POWER_CTRL) | TX3912_POWER_CTRL_STOPCPU,
		 TX3912_POWER_CTRL);

	/* 
	 * We wait until an interrupt happens...
	 */

	/* We resume here */
	outl(inl(TX3912_POWER_CTRL) & ~TX3912_POWER_CTRL_STOPCPU,
		 TX3912_POWER_CTRL);

	/* Give ourselves a little delay */
	__asm__ __volatile__(
		"nop\n\t"
		"nop\n\t"
		"nop\n\t"
		"nop\n\t"
		"nop\n\t"
		"nop\n\t"
		"nop\n\t");
}