1 files changed, 65 insertions, 0 deletions

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 <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);