1 files changed, 98 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/shmobile/cpuidle.c b/arch/sh/kernel/cpu/shmobile/cpuidle.c
new file mode 100644
index 000000000..c32e66079
--- /dev/null
+++ b/arch/sh/kernel/cpu/shmobile/cpuidle.c
@@ -0,0 +1,98 @@
+/*
+ * arch/sh/kernel/cpu/shmobile/cpuidle.c
+ *
+ * Cpuidle support code for SuperH Mobile
+ *
+ *  Copyright (C) 2009 Magnus Damm
+ *
+ * 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/init.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/suspend.h>
+#include <linux/cpuidle.h>
+#include <linux/export.h>
+#include <asm/suspend.h>
+#include <linux/uaccess.h>
+
+static unsigned long cpuidle_mode[] = {
+	SUSP_SH_SLEEP, /* regular sleep mode */
+	SUSP_SH_SLEEP | SUSP_SH_SF, /* sleep mode + self refresh */
+	SUSP_SH_STANDBY | SUSP_SH_SF, /* software standby mode + self refresh */
+};
+
+static int cpuidle_sleep_enter(struct cpuidle_device *dev,
+				struct cpuidle_driver *drv,
+				int index)
+{
+	unsigned long allowed_mode = SUSP_SH_SLEEP;
+	int requested_state = index;
+	int allowed_state;
+	int k;
+
+	/* convert allowed mode to allowed state */
+	for (k = ARRAY_SIZE(cpuidle_mode) - 1; k > 0; k--)
+		if (cpuidle_mode[k] == allowed_mode)
+			break;
+
+	allowed_state = k;
+
+	/* take the following into account for sleep mode selection:
+	 * - allowed_state: best mode allowed by hardware (clock deps)
+	 * - requested_state: best mode allowed by software (latencies)
+	 */
+	k = min_t(int, allowed_state, requested_state);
+
+	sh_mobile_call_standby(cpuidle_mode[k]);
+
+	return k;
+}
+
+static struct cpuidle_driver cpuidle_driver = {
+	.name   = "sh_idle",
+	.owner  = THIS_MODULE,
+	.states = {
+		{
+			.exit_latency = 1,
+			.target_residency = 1 * 2,
+			.power_usage = 3,
+			.enter = cpuidle_sleep_enter,
+			.name = "C1",
+			.desc = "SuperH Sleep Mode",
+		},
+		{
+			.exit_latency = 100,
+			.target_residency = 1 * 2,
+			.power_usage = 1,
+			.enter = cpuidle_sleep_enter,
+			.name = "C2",
+			.desc = "SuperH Sleep Mode [SF]",
+			.disabled = true,
+		},
+		{
+			.exit_latency = 2300,
+			.target_residency = 1 * 2,
+			.power_usage = 1,
+			.enter = cpuidle_sleep_enter,
+			.name = "C3",
+			.desc = "SuperH Mobile Standby Mode [SF]",
+			.disabled = true,
+		},
+	},
+	.safe_state_index = 0,
+	.state_count = 3,
+};
+
+int __init sh_mobile_setup_cpuidle(void)
+{
+	if (sh_mobile_sleep_supported & SUSP_SH_SF)
+		cpuidle_driver.states[1].disabled = false;
+
+	if (sh_mobile_sleep_supported & SUSP_SH_STANDBY)
+		cpuidle_driver.states[2].disabled = false;
+
+	return cpuidle_register(&cpuidle_driver, NULL);
+}