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 <j...@jms.id.au>
---
v2:
- combine the reboot and off cases, as they are the same code
arch/powerpc/include/asm/opal.h | 2 +-
arch/powerpc/platforms/powernv/Makefile | 2 +-
arch/powerpc/platforms/powernv/opal-power.c | 66 +++++++++++++++++++++++++++++
3 files changed, 68 insertions(+), 2 deletions(-)
create mode 100644 arch/powerpc/platforms/powernv/opal-power.c
diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index ca2dd45..cdf32c0 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -250,7 +250,7 @@ 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 f241acc..6f3c5d3 100644
--- 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
index 0000000..bbc1054
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/opal-power.c
@@ -0,0 +1,66 @@
+/*
+ * 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);
--
2.1.4
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