Shawn,

On 09/01/2011 07:22 AM, Shawn Guo wrote:

On Wed, Aug 31, 2011 at 08:44:06PM -0500, Rob Herring wrote:

quoted

From: Rob Herring <redacted>

Add the platform suspend ops for highbank.

Signed-off-by: Rob Herring <redacted>
---
Changes in v2:
 - s/a9_base_addr/scu_base_addr/
 - use sysregs helper functions
 - add __init to highbank_pm_init

 arch/arm/mach-highbank/Makefile |    1 +
 arch/arm/mach-highbank/pm.c     |   55 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/mach-highbank/pm.c

diff --git a/arch/arm/mach-highbank/Makefile b/arch/arm/mach-highbank/Makefile
index df30b0d..daeb3d8 100644
--- a/arch/arm/mach-highbank/Makefile
+++ b/arch/arm/mach-highbank/Makefile

@@ -3,3 +3,4 @@ obj-$(CONFIG_DEBUG_LL)			+= lluart.o
 obj-$(CONFIG_SMP)			+= platsmp.o
 obj-$(CONFIG_LOCAL_TIMERS)		+= localtimer.o
 obj-$(CONFIG_HOTPLUG_CPU)		+= hotplug.o
+obj-$(CONFIG_PM_SLEEP)			+= pm.o

diff --git a/arch/arm/mach-highbank/pm.c b/arch/arm/mach-highbank/pm.c
new file mode 100644
index 0000000..33b3beb
--- /dev/null
+++ b/arch/arm/mach-highbank/pm.c

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2011 Calxeda, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/suspend.h>
+
+#include <asm/proc-fns.h>
+#include <asm/smp_scu.h>
+#include <asm/suspend.h>
+
+#include "core.h"
+#include "sysregs.h"
+
+static int highbank_suspend_finish(unsigned long val)
+{
+	cpu_do_idle();
+	return 0;
+}
+
+static int highbank_pm_enter(suspend_state_t state)
+{
+	hignbank_set_pwr_suspend();
+	highbank_set_cpu_jump(0, cpu_resume);
+
+	scu_power_mode(scu_base_addr, SCU_PM_POWEROFF);
+	cpu_suspend(0, highbank_suspend_finish);
+

Rob,

Just out of curiosity, how can you resume back without taking care of
GIC, L2 and SCU which will lose power during suspend?

They are not powergated yet, so it's really just wfi ATM. The L2 and SCU
will be re-initialized by boot code. The GIC will need some save and
restore.

Rob