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95 lines
2.3 KiB
95 lines
2.3 KiB
// 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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