// 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);