66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
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/*
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* PowerNV OPAL power control for graceful shutdown handling
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*
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* Copyright 2015 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/reboot.h>
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#include <linux/notifier.h>
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#include <asm/opal.h>
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#include <asm/machdep.h>
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#define SOFT_OFF 0x00
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#define SOFT_REBOOT 0x01
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static int opal_power_control_event(struct notifier_block *nb,
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unsigned long msg_type, void *msg)
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{
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struct opal_msg *power_msg = msg;
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uint64_t type;
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type = be64_to_cpu(power_msg->params[0]);
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switch (type) {
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case SOFT_REBOOT:
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/* Fall through. The service processor is responsible for
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* bringing the machine back up */
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case SOFT_OFF:
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pr_info("OPAL: poweroff requested\n");
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orderly_poweroff(true);
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break;
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default:
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pr_err("OPAL: power control type unexpected %016llx\n", type);
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}
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return 0;
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}
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static struct notifier_block opal_power_control_nb = {
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.notifier_call = opal_power_control_event,
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.next = NULL,
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.priority = 0,
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};
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static int __init opal_power_control_init(void)
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{
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int ret;
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ret = opal_message_notifier_register(OPAL_MSG_SHUTDOWN,
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&opal_power_control_nb);
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if (ret) {
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pr_err("%s: Can't register OPAL event notifier (%d)\n",
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__func__, ret);
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return ret;
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}
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return 0;
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}
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machine_subsys_initcall(powernv, opal_power_control_init);
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