146 lines
3.8 KiB
C
146 lines
3.8 KiB
C
/*
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* Copyright (c) 2019 Linaro Limited.
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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 <sys/__assert.h>
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#include "pm_policy.h"
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#include <ti/devices/cc13x2_cc26x2/driverlib/sys_ctrl.h>
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#include <ti/drivers/Power.h>
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#include <ti/drivers/power/PowerCC26X2.h>
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#include <ti/drivers/dpl/ClockP.h>
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#include <ti/drivers/dpl/HwiP.h>
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#include <ti/drivers/dpl/SwiP.h>
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#define LOG_LEVEL CONFIG_SYS_PM_LOG_LEVEL
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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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/* Wakeup delay from standby in microseconds */
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#define WAKEDELAYSTANDBY 240
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extern PowerCC26X2_ModuleState PowerCC26X2_module;
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/* PM Policy based on SoC/Platform residency requirements */
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static const unsigned int pm_min_residency[] = {
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#ifdef CONFIG_SYS_POWER_SLEEP_STATES
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CONFIG_SYS_PM_MIN_RESIDENCY_SLEEP_1 * SECS_TO_TICKS / MSEC_PER_SEC,
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CONFIG_SYS_PM_MIN_RESIDENCY_SLEEP_2 * SECS_TO_TICKS / MSEC_PER_SEC,
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#endif /* CONFIG_SYS_POWER_SLEEP_STATES */
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};
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enum power_states sys_pm_policy_next_state(s32_t ticks)
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{
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u32_t constraints;
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bool disallowed = false;
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int i;
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/* check operating conditions, optimally choose DCDC versus GLDO */
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SysCtrl_DCDC_VoltageConditionalControl();
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/* query the declared constraints */
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constraints = Power_getConstraintMask();
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if ((ticks != K_FOREVER) && (ticks < pm_min_residency[0])) {
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LOG_DBG("Not enough time for PM operations: %d", ticks);
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return SYS_POWER_STATE_ACTIVE;
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}
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for (i = ARRAY_SIZE(pm_min_residency) - 1; i >= 0; i--) {
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#ifdef CONFIG_SYS_PM_STATE_LOCK
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if (!sys_pm_ctrl_is_state_enabled((enum power_states)(i))) {
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continue;
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}
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#endif
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if ((ticks == K_FOREVER) ||
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(ticks >= pm_min_residency[i])) {
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/* Verify if Power module has constraints set to
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* disallow a state
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*/
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switch (i) {
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case 0: /* Idle mode */
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if ((constraints & (1 <<
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PowerCC26XX_DISALLOW_IDLE)) != 0) {
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disallowed = true;
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}
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break;
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case 1: /* Standby mode */
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if ((constraints & (1 <<
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PowerCC26XX_DISALLOW_STANDBY)) != 0) {
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disallowed = true;
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}
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/* Set timeout for wakeup event */
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__ASSERT(
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CONFIG_SYS_PM_MIN_RESIDENCY_SLEEP_2 > 1,
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"CONFIG_SYS_PM_MIN_RESIDENCY_SLEEP_2 must "
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"be greater than 1.");
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if (ticks != K_FOREVER) {
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/* NOTE: Ideally we'd like to set a
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* timer to wake up just a little
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* earlier to take care of the wakeup
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* sequence, ie. by WAKEDELAYSTANDBY
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* microsecs. However, given
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* k_timer_start (called later by
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* ClockP_start) does not currently
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* have sub-millisecond accuracy, wakeup
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* would be at up to (WAKEDELAYSTANDBY
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* + 1 ms) ahead of the next timeout.
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* This also has the implication that
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* SYS_PM_MIN_RESIDENCY_SLEEP_2
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* must be greater than 1.
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*/
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ticks -= (WAKEDELAYSTANDBY *
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CONFIG_SYS_CLOCK_TICKS_PER_SEC
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+ 1000000) / 1000000;
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#if (CONFIG_SYS_CLOCK_TICKS_PER_SEC <= 1000)
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/*
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* ClockP_setTimeout cannot handle any
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* more ticks
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*/
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ticks = MIN(ticks, UINT32_MAX / 1000 *
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CONFIG_SYS_CLOCK_TICKS_PER_SEC);
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#endif
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ClockP_setTimeout(ClockP_handle(
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(ClockP_Struct *)
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&PowerCC26X2_module.clockObj),
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ticks);
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}
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break;
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default:
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/* This should never be reached */
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LOG_ERR("Invalid sleep state detected\n");
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}
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if (disallowed) {
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disallowed = false;
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continue;
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}
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LOG_DBG("Selected power state %d "
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"(ticks: %d, min_residency: %u)",
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i, ticks, pm_min_residency[i]);
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return (enum power_states)(i);
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}
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}
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LOG_DBG("No suitable power state found!");
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return SYS_POWER_STATE_ACTIVE;
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}
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__weak bool sys_pm_policy_low_power_devices(enum power_states pm_state)
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{
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#ifdef CONFIG_SYS_POWER_SLEEP_STATES
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return (pm_state == SYS_POWER_STATE_SLEEP_2);
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#else
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return false;
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#endif
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}
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