From 7f43e71e8c538356efd5b33a183e6d9ace4739a5 Mon Sep 17 00:00:00 2001 From: Joel Stanley Date: Fri, 30 Jan 2015 17:13:08 +1030 Subject: 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: Joel Stanley Signed-off-by: Michael Ellerman --- arch/powerpc/platforms/powernv/opal-power.c | 65 +++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 arch/powerpc/platforms/powernv/opal-power.c (limited to 'arch/powerpc/platforms/powernv/opal-power.c') diff --git a/arch/powerpc/platforms/powernv/opal-power.c b/arch/powerpc/platforms/powernv/opal-power.c new file mode 100644 index 000000000000..48bf5b080bcf --- /dev/null +++ b/arch/powerpc/platforms/powernv/opal-power.c @@ -0,0 +1,65 @@ +/* + * 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 +#include +#include + +#include +#include + +#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); -- cgit v1.2.3