// SPDX-License-Identifier: GPL-2.0
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/*
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* arch/sh/kernel/cpu/shmobile/cpuidle.c
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*
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* Cpuidle support code for SuperH Mobile
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*
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* Copyright (C) 2009 Magnus Damm
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <linux/suspend.h>
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#include <linux/cpuidle.h>
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#include <linux/export.h>
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#include <asm/suspend.h>
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#include <linux/uaccess.h>
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static unsigned long cpuidle_mode[] = {
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SUSP_SH_SLEEP, /* regular sleep mode */
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SUSP_SH_SLEEP | SUSP_SH_SF, /* sleep mode + self refresh */
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SUSP_SH_STANDBY | SUSP_SH_SF, /* software standby mode + self refresh */
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};
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static int cpuidle_sleep_enter(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index)
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{
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unsigned long allowed_mode = SUSP_SH_SLEEP;
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int requested_state = index;
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int allowed_state;
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int k;
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/* convert allowed mode to allowed state */
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for (k = ARRAY_SIZE(cpuidle_mode) - 1; k > 0; k--)
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if (cpuidle_mode[k] == allowed_mode)
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break;
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allowed_state = k;
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/* take the following into account for sleep mode selection:
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* - allowed_state: best mode allowed by hardware (clock deps)
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* - requested_state: best mode allowed by software (latencies)
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*/
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k = min_t(int, allowed_state, requested_state);
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sh_mobile_call_standby(cpuidle_mode[k]);
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return k;
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}
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static struct cpuidle_driver cpuidle_driver = {
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.name = "sh_idle",
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.owner = THIS_MODULE,
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.states = {
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{
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.exit_latency = 1,
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.target_residency = 1 * 2,
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.power_usage = 3,
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.enter = cpuidle_sleep_enter,
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.name = "C1",
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.desc = "SuperH Sleep Mode",
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},
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{
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.exit_latency = 100,
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.target_residency = 1 * 2,
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.power_usage = 1,
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.enter = cpuidle_sleep_enter,
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.name = "C2",
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.desc = "SuperH Sleep Mode [SF]",
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.flags = CPUIDLE_FLAG_UNUSABLE,
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},
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{
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.exit_latency = 2300,
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.target_residency = 1 * 2,
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.power_usage = 1,
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.enter = cpuidle_sleep_enter,
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.name = "C3",
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.desc = "SuperH Mobile Standby Mode [SF]",
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.flags = CPUIDLE_FLAG_UNUSABLE,
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},
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},
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.safe_state_index = 0,
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.state_count = 3,
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};
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int __init sh_mobile_setup_cpuidle(void)
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{
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if (sh_mobile_sleep_supported & SUSP_SH_SF)
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cpuidle_driver.states[1].flags = CPUIDLE_FLAG_NONE;
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if (sh_mobile_sleep_supported & SUSP_SH_STANDBY)
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cpuidle_driver.states[2].flags = CPUIDLE_FLAG_NONE;
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return cpuidle_register(&cpuidle_driver, NULL);
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}
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