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997e93d4df
The generic MIPS implementations of halting, powering down or restarting the system all hang using a busy loop as a last resort. We have many platforms which avoid this loop by implementing their own, many using some variation upon executing a wait instruction to lower CPU power usage if we reach this point. In order to prepare for cleaning up these various custom implementations of the same thing, this patch makes the generic machine_halt(), machine_power_off() & machine_restart() functions each make use of the wait instruction to lower CPU power usage in cases where we know that the wait instruction is available. If wait isn't known to be supported then we fall back to calling cpu_wait(), and if we don't have a cpu_wait() callback then we effectively continue using a busy loop. In effect the new machine_hang() function provides a superset of the functionality that the various platforms currently provide differing subsets of. Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/17178/ Signed-off-by: James Hogan <jhogan@kernel.org>
126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2001, 06 by Ralf Baechle (ralf@linux-mips.org)
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* Copyright (C) 2001 MIPS Technologies, Inc.
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*/
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/pm.h>
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#include <linux/types.h>
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#include <linux/reboot.h>
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#include <linux/delay.h>
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#include <asm/compiler.h>
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#include <asm/idle.h>
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#include <asm/mipsregs.h>
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#include <asm/reboot.h>
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/*
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* Urgs ... Too many MIPS machines to handle this in a generic way.
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* So handle all using function pointers to machine specific
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* functions.
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*/
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void (*_machine_restart)(char *command);
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void (*_machine_halt)(void);
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void (*pm_power_off)(void);
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EXPORT_SYMBOL(pm_power_off);
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static void machine_hang(void)
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{
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/*
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* We're hanging the system so we don't want to be interrupted anymore.
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* Any interrupt handlers that ran would at best be useless & at worst
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* go awry because the system isn't in a functional state.
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*/
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local_irq_disable();
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/*
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* Mask all interrupts, giving us a better chance of remaining in the
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* low power wait state.
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*/
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clear_c0_status(ST0_IM);
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while (true) {
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if (cpu_has_mips_r) {
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/*
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* We know that the wait instruction is supported so
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* make use of it directly, leaving interrupts
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* disabled.
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*/
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asm volatile(
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".set push\n\t"
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".set " MIPS_ISA_ARCH_LEVEL "\n\t"
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"wait\n\t"
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".set pop");
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} else if (cpu_wait) {
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/*
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* Try the cpu_wait() callback. This isn't ideal since
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* it'll re-enable interrupts, but that ought to be
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* harmless given that they're all masked.
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*/
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cpu_wait();
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local_irq_disable();
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} else {
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/*
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* We're going to burn some power running round the
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* loop, but we don't really have a choice. This isn't
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* a path we should expect to run for long during
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* typical use anyway.
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*/
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}
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/*
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* In most modern MIPS CPUs interrupts will cause the wait
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* instruction to graduate even when disabled, and in some
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* cases even when masked. In order to prevent a timer
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* interrupt from continuously taking us out of the low power
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* wait state, we clear any pending timer interrupt here.
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*/
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if (cpu_has_counter)
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write_c0_compare(0);
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}
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}
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void machine_restart(char *command)
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{
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if (_machine_restart)
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_machine_restart(command);
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#ifdef CONFIG_SMP
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preempt_disable();
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smp_send_stop();
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#endif
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do_kernel_restart(command);
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mdelay(1000);
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pr_emerg("Reboot failed -- System halted\n");
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machine_hang();
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}
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void machine_halt(void)
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{
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if (_machine_halt)
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_machine_halt();
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#ifdef CONFIG_SMP
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preempt_disable();
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smp_send_stop();
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#endif
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machine_hang();
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}
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void machine_power_off(void)
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{
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if (pm_power_off)
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pm_power_off();
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#ifdef CONFIG_SMP
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preempt_disable();
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smp_send_stop();
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#endif
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machine_hang();
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}
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