Joel Stanley | 7f43e71 | 2015-01-30 17:13:08 +1030 | [diff] [blame] | 1 | /* |
| 2 | * PowerNV OPAL power control for graceful shutdown handling |
| 3 | * |
| 4 | * Copyright 2015 IBM Corp. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/reboot.h> |
| 14 | #include <linux/notifier.h> |
| 15 | |
| 16 | #include <asm/opal.h> |
| 17 | #include <asm/machdep.h> |
| 18 | |
| 19 | #define SOFT_OFF 0x00 |
| 20 | #define SOFT_REBOOT 0x01 |
| 21 | |
| 22 | static int opal_power_control_event(struct notifier_block *nb, |
| 23 | unsigned long msg_type, void *msg) |
| 24 | { |
| 25 | struct opal_msg *power_msg = msg; |
| 26 | uint64_t type; |
| 27 | |
| 28 | type = be64_to_cpu(power_msg->params[0]); |
| 29 | |
| 30 | switch (type) { |
| 31 | case SOFT_REBOOT: |
Joel Stanley | e243304 | 2015-04-15 16:16:56 -0700 | [diff] [blame] | 32 | pr_info("OPAL: reboot requested\n"); |
| 33 | orderly_reboot(); |
| 34 | break; |
Joel Stanley | 7f43e71 | 2015-01-30 17:13:08 +1030 | [diff] [blame] | 35 | case SOFT_OFF: |
| 36 | pr_info("OPAL: poweroff requested\n"); |
| 37 | orderly_poweroff(true); |
| 38 | break; |
| 39 | default: |
| 40 | pr_err("OPAL: power control type unexpected %016llx\n", type); |
| 41 | } |
| 42 | |
| 43 | return 0; |
| 44 | } |
| 45 | |
| 46 | static struct notifier_block opal_power_control_nb = { |
| 47 | .notifier_call = opal_power_control_event, |
| 48 | .next = NULL, |
| 49 | .priority = 0, |
| 50 | }; |
| 51 | |
| 52 | static int __init opal_power_control_init(void) |
| 53 | { |
| 54 | int ret; |
| 55 | |
| 56 | ret = opal_message_notifier_register(OPAL_MSG_SHUTDOWN, |
| 57 | &opal_power_control_nb); |
| 58 | if (ret) { |
| 59 | pr_err("%s: Can't register OPAL event notifier (%d)\n", |
| 60 | __func__, ret); |
| 61 | return ret; |
| 62 | } |
| 63 | |
| 64 | return 0; |
| 65 | } |
| 66 | machine_subsys_initcall(powernv, opal_power_control_init); |