94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/*
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* Copyright (c) 2018 Intel Corporation.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr.h>
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#include <kernel.h>
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#include <soc.h>
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#include "pm_policy.h"
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#define LOG_LEVEL CONFIG_PM_LOG_LEVEL /* From power module Kconfig */
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#include <logging/log.h>
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LOG_MODULE_DECLARE(power);
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#define SECS_TO_TICKS CONFIG_SYS_CLOCK_TICKS_PER_SEC
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#if !(defined(CONFIG_SYS_POWER_STATE_CPU_LPS_SUPPORTED) || \
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defined(CONFIG_SYS_POWER_STATE_CPU_LPS_1_SUPPORTED) || \
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defined(CONFIG_SYS_POWER_STATE_CPU_LPS_2_SUPPORTED) || \
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defined(CONFIG_SYS_POWER_STATE_DEEP_SLEEP_SUPPORTED) || \
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defined(CONFIG_SYS_POWER_STATE_DEEP_SLEEP_1_SUPPORTED) || \
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defined(CONFIG_SYS_POWER_STATE_DEEP_SLEEP_2_SUPPORTED))
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#error "Enable Low Power States at SoC Level"
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#endif
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struct sys_pm_policy {
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enum power_states pm_state;
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int sys_state;
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int min_residency;
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};
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/* PM Policy based on SoC/Platform residency requirements */
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static struct sys_pm_policy pm_policy[] = {
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#ifdef CONFIG_SYS_POWER_STATE_CPU_LPS_SUPPORTED
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{SYS_POWER_STATE_CPU_LPS, SYS_PM_LOW_POWER_STATE,
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CONFIG_PM_LPS_MIN_RES * SECS_TO_TICKS},
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#endif
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#ifdef CONFIG_SYS_POWER_STATE_CPU_LPS_1_SUPPORTED
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{SYS_POWER_STATE_CPU_LPS_1, SYS_PM_LOW_POWER_STATE,
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CONFIG_PM_LPS_1_MIN_RES * SECS_TO_TICKS},
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#endif
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#ifdef CONFIG_SYS_POWER_STATE_CPU_LPS_2_SUPPORTED
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{SYS_POWER_STATE_CPU_LPS_2, SYS_PM_LOW_POWER_STATE,
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CONFIG_PM_LPS_2_MIN_RES * SECS_TO_TICKS},
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#endif
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#ifdef CONFIG_SYS_POWER_STATE_DEEP_SLEEP_SUPPORTED
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{SYS_POWER_STATE_DEEP_SLEEP, SYS_PM_DEEP_SLEEP,
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CONFIG_PM_DEEP_SLEEP_MIN_RES * SECS_TO_TICKS},
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#endif
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#ifdef CONFIG_SYS_POWER_STATE_DEEP_SLEEP_1_SUPPORTED
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{SYS_POWER_STATE_DEEP_SLEEP_1, SYS_PM_DEEP_SLEEP,
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CONFIG_PM_DEEP_SLEEP_1_MIN_RES * SECS_TO_TICKS},
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#endif
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#ifdef CONFIG_SYS_POWER_STATE_DEEP_SLEEP_2_SUPPORTED
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{SYS_POWER_STATE_DEEP_SLEEP_2, SYS_PM_DEEP_SLEEP,
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CONFIG_PM_DEEP_SLEEP_2_MIN_RES * SECS_TO_TICKS},
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#endif
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};
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int sys_pm_policy_next_state(s32_t ticks, enum power_states *pm_state)
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{
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int i;
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if ((ticks != K_FOREVER) && (ticks < pm_policy[0].min_residency)) {
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LOG_ERR("Not enough time for PM operations: %d\n", ticks);
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return SYS_PM_NOT_HANDLED;
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}
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for (i = 0; i < (ARRAY_SIZE(pm_policy) - 1); i++) {
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if ((ticks >= pm_policy[i].min_residency) &&
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(ticks < pm_policy[i + 1].min_residency)) {
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break;
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}
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}
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if (!sys_is_valid_power_state(pm_policy[i].pm_state)) {
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LOG_ERR("pm_state(%d) not supported by SoC\n",
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pm_policy[i].pm_state);
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return SYS_PM_NOT_HANDLED;
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}
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*pm_state = pm_policy[i].pm_state;
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LOG_DBG("pm_state: %d, min_residency: %d, idx: %d\n",
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*pm_state, pm_policy[i].min_residency, i);
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return pm_policy[i].sys_state;
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}
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