[PATCH v2] ARM: highbank: handle soft poweroff and reset key events

[robherring2@gmail.com (Rob Herring)]

From: Rob Herring <rob.herring@calxeda.com>

Graceful reboot and poweroff via IPMI commands to the management
processor don't work. Power and reset keys are events from the
management processor which are generated via IPC messages. Passing
the keys to userspace does not work as neither acpid nor a desktop
environment are present.

This adds a notifier handler for the IPC messages so the kernel can
handle the key events directly and IPMI graceful shutdown will work.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
---
v2: Re-word the commit msg to give better description of the issue.

 arch/arm/mach-highbank/highbank.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/arch/arm/mach-highbank/highbank.c b/arch/arm/mach-highbank/highbank.c
index b3d7e56..bd3bf66 100644
--- a/arch/arm/mach-highbank/highbank.c
+++ b/arch/arm/mach-highbank/highbank.c
@@ -17,12 +17,15 @@
 #include <linux/clkdev.h>
 #include <linux/clocksource.h>
 #include <linux/dma-mapping.h>
+#include <linux/input.h>
 #include <linux/io.h>
 #include <linux/irqchip.h>
+#include <linux/mailbox.h>
 #include <linux/of.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
 #include <linux/of_address.h>
+#include <linux/reboot.h>
 #include <linux/amba/bus.h>
 #include <linux/platform_device.h>
 
@@ -130,6 +133,24 @@ static struct platform_device highbank_cpuidle_device = {
 	.name = "cpuidle-calxeda",
 };
 
+static int hb_keys_notifier(struct notifier_block *nb, unsigned long event, void *data)
+{
+	u32 key = *(u32 *)data;
+
+	if (event != 0x1000)
+		return 0;
+
+	if (key == KEY_POWER)
+		orderly_poweroff(false);
+	else if (key == 0xffff)
+		ctrl_alt_del();
+
+	return 0;
+}
+static struct notifier_block hb_keys_nb = {
+	.notifier_call = hb_keys_notifier,
+};
+
 static void __init highbank_init(void)
 {
 	struct device_node *np;
@@ -145,6 +166,8 @@ static void __init highbank_init(void)
 	bus_register_notifier(&platform_bus_type, &highbank_platform_nb);
 	bus_register_notifier(&amba_bustype, &highbank_amba_nb);
 
+	pl320_ipc_register_notifier(&hb_keys_nb);
+
 	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 
 	if (psci_ops.cpu_suspend)
-- 
1.8.3.2