ARM: shmobile: sh73a0: Add CPU sleep suspend

Add the lighest possible sleep mode on Cortex-A9 cores: CPU sleep. It is
entered by a simple dsb and wfi instruction via cpu_do_idle(). As just
clocks are stopped there is no need to save or restore any state of the
system.

Signed-off-by: Bastian Hecht <hechtb+renesas@gmail.com>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

1 files changed, 32 insertions, 0 deletions

diff --git a/arch/arm/mach-shmobile/pm-sh73a0.c b/arch/arm/mach-shmobile/pm-sh73a0.c
new file mode 100644
index 0000000..99086e9
--- /dev/null
+++ b/arch/arm/mach-shmobile/pm-sh73a0.c
@@ -0,0 +1,32 @@
+/*
+ * sh73a0 Power management support
+ *
+ *  Copyright (C) 2012 Bastian Hecht <hechtb+renesas@gmail.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/suspend.h>
+#include <mach/common.h>
+
+#ifdef CONFIG_SUSPEND
+static int sh73a0_enter_suspend(suspend_state_t suspend_state)
+{
+	cpu_do_idle();
+	return 0;
+}
+
+static void sh73a0_suspend_init(void)
+{
+	shmobile_suspend_ops.enter = sh73a0_enter_suspend;
+}
+#else
+static void sh73a0_suspend_init(void) {}
+#endif
+
+void __init sh73a0_pm_init(void)
+{
+	sh73a0_suspend_init();
+}