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