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[MIPS] vr41xx: add cpu_wait
Add cpu_wait for NEC VR41xx Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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@ -1,7 +1,7 @@
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/*
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* pmu.c, Power Management Unit routines for NEC VR4100 series.
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*
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* Copyright (C) 2003-2005 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
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* Copyright (C) 2003-2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@ -22,11 +22,12 @@
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#include <linux/ioport.h>
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#include <linux/kernel.h>
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#include <linux/pm.h>
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#include <linux/smp.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <asm/cpu.h>
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#include <asm/io.h>
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#include <asm/processor.h>
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#include <asm/reboot.h>
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#include <asm/system.h>
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@ -44,6 +45,18 @@ static void __iomem *pmu_base;
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#define pmu_read(offset) readw(pmu_base + (offset))
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#define pmu_write(offset, value) writew((value), pmu_base + (offset))
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static void vr41xx_cpu_wait(void)
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{
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local_irq_disable();
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if (!need_resched())
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/*
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* "standby" sets IE bit of the CP0_STATUS to 1.
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*/
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__asm__("standby;\n");
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else
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local_irq_enable();
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}
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static inline void software_reset(void)
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{
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uint16_t pmucnt2;
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@ -113,6 +126,7 @@ static int __init vr41xx_pmu_init(void)
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return -EBUSY;
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}
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cpu_wait = vr41xx_cpu_wait;
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_machine_restart = vr41xx_restart;
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_machine_halt = vr41xx_halt;
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pm_power_off = vr41xx_power_off;
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