linux-kernel - [PATCH 1/3] x86/mrst: add Moorestown specific reboot/shutdown support

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Date:	Wed, 10 Nov 2010 16:50:08 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] x86/mrst: add Moorestown specific reboot/shutdown support

From: Alek Du <alek.du@...el.com>

Moorestowns needs to use a special IPC command to reboot or shutdown the
platform.

Signed-off-by: Alek Du <alek.du@...el.com>
Signed-off-by: Alan Cox <alan@...ux.intel.com>
---

 arch/x86/platform/mrst/mrst.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)


diff --git a/arch/x86/platform/mrst/mrst.c b/arch/x86/platform/mrst/mrst.c
index 8705f6b..10fec10 100644
--- a/arch/x86/platform/mrst/mrst.c
+++ b/arch/x86/platform/mrst/mrst.c
@@ -35,6 +35,7 @@
 #include <asm/i8259.h>
 #include <asm/intel_scu_ipc.h>
 #include <asm/apb_timer.h>
+#include <asm/reboot.h>
 
 
 /*
@@ -268,6 +269,17 @@ static int mrst_i8042_detect(void)
 	return 0;
 }
 
+/* Reboot and power off are handled by the SCU on a MID device */
+static void mrst_power_off(void)
+{
+	intel_scu_ipc_simple_command(0xf1, 1);
+}
+
+static void mrst_reboot(void)
+{
+	intel_scu_ipc_simple_command(0xf1, 0);
+}
+
 /*
  * Moorestown specific x86_init function overrides and early setup
  * calls.
@@ -293,6 +305,10 @@ void __init x86_mrst_early_setup(void)
 
 	legacy_pic = &null_legacy_pic;
 
+	/* Moorestown specific power_off/restart method */
+	pm_power_off = mrst_power_off;
+	machine_ops.emergency_restart  = mrst_reboot;
+
 	/* Avoid searching for BIOS MP tables */
 	x86_init.mpparse.find_smp_config = x86_init_noop;
 	x86_init.mpparse.get_smp_config = x86_init_uint_noop;

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