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 <joel@jms.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index 2baf8a5925ca964067e7f3dbaa798835bd39135c..9ee0a30a02cefc6a43e7498fad2a548de72e54fa 100644 (file)
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -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,
 };

diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile
index f241accc053dc92cf25e9019c034b172789bd8d7..6f3c5d33c3af9f247879290b0cf9353941b796c7 100644 (file)
--- a/arch/powerpc/platforms/powernv/Makefile
+++ b/arch/powerpc/platforms/powernv/Makefile
@@ -1,7 +1,7 @@
 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

diff --git a/arch/powerpc/platforms/powernv/opal-power.c b/arch/powerpc/platforms/powernv/opal-power.c
new file mode 100644 (file)
index 0000000..48bf5b0
--- /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);