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