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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2008 IBM Corp.
*
* Based on arch/powerpc/platforms/pasemi/idle.c:
* Copyright (C) 2006-2007 PA Semi, Inc
*
* Added by: Jerone Young <jyoung5@us.ibm.com>
*/
#include <linux/of.h>
#include <linux/kernel.h>
#include <asm/machdep.h>
static int mode_spin;
static void ppc44x_idle(void)
{
unsigned long msr_save;
msr_save = mfmsr();
/* set wait state MSR */
mtmsr(msr_save|MSR_WE|MSR_EE|MSR_CE|MSR_DE);
isync();
/* return to initial state */
mtmsr(msr_save);
isync();
}
static int __init ppc44x_idle_init(void)
{
if (!mode_spin) {
/* If we are not setting spin mode
then we set to wait mode */
ppc_md.power_save = &ppc44x_idle;
}
return 0;
}
arch_initcall(ppc44x_idle_init);
static int __init idle_param(char *p)
{
if (!strcmp("spin", p)) {
mode_spin = 1;
ppc_md.power_save = NULL;
}
return 0;
}
early_param("idle", idle_param);
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