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Commit 7f43e71e authored by Joel Stanley's avatar Joel Stanley Committed by Michael Ellerman
Browse files

powerpc/powernv: Add OPAL soft-poweroff routine 



Register a notifier for a OPAL message indicating that the machine
should prepare itself for a graceful power off.

OPAL will tell us if the power off is a reboot or shutdown, but for now
we perform the same orderly_poweroff action.

Signed-off-by: default avatarJoel Stanley <joel@jms.id.au>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent a604c96e

arch/powerpc/include/asm/opal.h

+1 −1
Original line number Diff line number Diff line
@@ -304,7 +304,7 @@ enum OpalMessageType { 
					 */

	OPAL_MSG_MEM_ERR,

	OPAL_MSG_EPOW,

	OPAL_MSG_SHUTDOWN,

	OPAL_MSG_SHUTDOWN,		/* params[0] = 1 reboot, 0 shutdown */

	OPAL_MSG_HMI_EVT,

	OPAL_MSG_TYPE_MAX,

};

arch/powerpc/platforms/powernv/Makefile

+1 −1
Original line number Diff line number Diff line 
obj-y			+= setup.o opal-wrappers.o opal.o opal-async.o

obj-y			+= opal-rtc.o opal-nvram.o opal-lpc.o opal-flash.o

obj-y			+= rng.o opal-elog.o opal-dump.o opal-sysparam.o opal-sensor.o

obj-y			+= opal-msglog.o opal-hmi.o

obj-y			+= opal-msglog.o opal-hmi.o opal-power.o



obj-$(CONFIG_SMP)	+= smp.o subcore.o subcore-asm.o

obj-$(CONFIG_PCI)	+= pci.o pci-p5ioc2.o pci-ioda.o

arch/powerpc/platforms/powernv/opal-power.c

0 → 100644
+65 −0
Original line number Diff line number Diff line 
/*

 * 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);