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-rw-r--r--arch/sh/kernel/cpu/shmobile/cpuidle.c95
1 files changed, 95 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..b0f9c8f8f
--- /dev/null
+++ b/arch/sh/kernel/cpu/shmobile/cpuidle.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * arch/sh/kernel/cpu/shmobile/cpuidle.c
+ *
+ * Cpuidle support code for SuperH Mobile
+ *
+ * Copyright (C) 2009 Magnus Damm
+ */
+#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]",
+ .flags = CPUIDLE_FLAG_UNUSABLE,
+ },
+ {
+ .exit_latency = 2300,
+ .target_residency = 1 * 2,
+ .power_usage = 1,
+ .enter = cpuidle_sleep_enter,
+ .name = "C3",
+ .desc = "SuperH Mobile Standby Mode [SF]",
+ .flags = CPUIDLE_FLAG_UNUSABLE,
+ },
+ },
+ .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].flags = CPUIDLE_FLAG_NONE;
+
+ if (sh_mobile_sleep_supported & SUSP_SH_STANDBY)
+ cpuidle_driver.states[2].flags = CPUIDLE_FLAG_NONE;
+
+ return cpuidle_register(&cpuidle_driver, NULL);
+}