1 files changed, 120 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 00000000..1ddc876d
--- /dev/null
+++ b/arch/sh/kernel/cpu/shmobile/cpuidle.c
@@ -0,0 +1,120 @@
+/*
+ * 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 <asm/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_device cpuidle_dev;
+static struct cpuidle_driver cpuidle_driver = {
+	.name			= "sh_idle",
+	.owner			= THIS_MODULE,
+	.en_core_tk_irqen	= 1,
+};
+
+void sh_mobile_setup_cpuidle(void)
+{
+	struct cpuidle_device *dev = &cpuidle_dev;
+	struct cpuidle_driver *drv = &cpuidle_driver;
+	struct cpuidle_state *state;
+	int i;
+
+
+	for (i = 0; i < CPUIDLE_STATE_MAX; i++) {
+		drv->states[i].name[0] = '\0';
+		drv->states[i].desc[0] = '\0';
+	}
+
+	i = CPUIDLE_DRIVER_STATE_START;
+
+	state = &drv->states[i++];
+	snprintf(state->name, CPUIDLE_NAME_LEN, "C1");
+	strncpy(state->desc, "SuperH Sleep Mode", CPUIDLE_DESC_LEN);
+	state->exit_latency = 1;
+	state->target_residency = 1 * 2;
+	state->power_usage = 3;
+	state->flags = 0;
+	state->flags |= CPUIDLE_FLAG_TIME_VALID;
+	state->enter = cpuidle_sleep_enter;
+
+	drv->safe_state_index = i-1;
+
+	if (sh_mobile_sleep_supported & SUSP_SH_SF) {
+		state = &drv->states[i++];
+		snprintf(state->name, CPUIDLE_NAME_LEN, "C2");
+		strncpy(state->desc, "SuperH Sleep Mode [SF]",
+			CPUIDLE_DESC_LEN);
+		state->exit_latency = 100;
+		state->target_residency = 1 * 2;
+		state->power_usage = 1;
+		state->flags = 0;
+		state->flags |= CPUIDLE_FLAG_TIME_VALID;
+		state->enter = cpuidle_sleep_enter;
+	}
+
+	if (sh_mobile_sleep_supported & SUSP_SH_STANDBY) {
+		state = &drv->states[i++];
+		snprintf(state->name, CPUIDLE_NAME_LEN, "C3");
+		strncpy(state->desc, "SuperH Mobile Standby Mode [SF]",
+			CPUIDLE_DESC_LEN);
+		state->exit_latency = 2300;
+		state->target_residency = 1 * 2;
+		state->power_usage = 1;
+		state->flags = 0;
+		state->flags |= CPUIDLE_FLAG_TIME_VALID;
+		state->enter = cpuidle_sleep_enter;
+	}
+
+	drv->state_count = i;
+	dev->state_count = i;
+
+	cpuidle_register_driver(&cpuidle_driver);
+
+	cpuidle_register_device(dev);
+}