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sys/ztimer: add power management for ztimer clocks

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This commit is contained in:
Juergen Fitschen 2020-03-26 10:56:10 +01:00
parent c42677609b
commit 73e22612e2
3 changed files with 49 additions and 0 deletions
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8
sys/include/ztimer.h
View File

@ -223,6 +223,11 @@
extern "C" {
#endif
/**
* @brief Disables interaction with pm_layered for a clock
*/
#define ZTIMER_CLOCK_NO_REQUIRED_PM_MODE (UINT8_MAX)
/**
* @brief ztimer_base_t forward declaration
*/
@ -297,6 +302,9 @@ struct ztimer_clock {
uint32_t lower_last; /**< timer value at last now() call */
ztimer_now_t checkpoint; /**< cumulated time at last now() call */
#endif
#if MODULE_PM_LAYERED || DOXYGEN
uint8_t required_pm_mode; /**< min. pm mode required for the clock to run */
#endif
};
/**

18
sys/ztimer/auto_init.c
View File

@ -86,6 +86,14 @@
#define CONFIG_ZTIMER_USEC_WIDTH (32)
#endif
#ifndef CONFIG_ZTIMER_USEC_REQUIRED_PM_MODE
#define CONFIG_ZTIMER_USEC_REQUIRED_PM_MODE ZTIMER_CLOCK_NO_REQUIRED_PM_MODE
#endif
#ifndef CONFIG_ZTIMER_MSEC_REQUIRED_PM_MODE
#define CONFIG_ZTIMER_MSEC_REQUIRED_PM_MODE ZTIMER_CLOCK_NO_REQUIRED_PM_MODE
#endif
#if MODULE_ZTIMER_USEC
# if CONFIG_ZTIMER_USEC_TYPE_PERIPH_TIMER
static ztimer_periph_timer_t _ztimer_periph_timer_usec = { .min = CONFIG_ZTIMER_USEC_MIN };
@ -160,6 +168,11 @@ void ztimer_init(void)
CONFIG_ZTIMER_USEC_ADJUST);
ZTIMER_USEC->adjust = CONFIG_ZTIMER_USEC_ADJUST;
# endif
# ifdef MODULE_PM_LAYERED
LOG_DEBUG("ztimer_init(): ZTIMER_USEC setting required_pm_mode to %i\n",
CONFIG_ZTIMER_USEC_REQUIRED_PM_MODE);
ZTIMER_USEC->required_pm_mode = CONFIG_ZTIMER_USEC_REQUIRED_PM_MODE;
# endif
#endif
#ifdef ZTIMER_RTT_INIT
@ -180,5 +193,10 @@ void ztimer_init(void)
CONFIG_ZTIMER_MSEC_ADJUST);
ZTIMER_MSEC->adjust = CONFIG_ZTIMER_MSEC_ADJUST;
# endif
# ifdef MODULE_PM_LAYERED
LOG_DEBUG("ztimer_init(): ZTIMER_MSEC setting required_pm_mode to %i\n",
CONFIG_ZTIMER_MSEC_REQUIRED_PM_MODE);
ZTIMER_MSEC->required_pm_mode = CONFIG_ZTIMER_MSEC_REQUIRED_PM_MODE;
# endif
#endif
}

23
sys/ztimer/core.c
View File

@ -27,6 +27,9 @@
#include "kernel_defines.h"
#include "irq.h"
#ifdef MODULE_PM_LAYERED
#include "pm_layered.h"
#endif
#include "ztimer.h"
#define ENABLE_DEBUG (0)
@ -106,6 +109,13 @@ static void _add_entry_to_list(ztimer_clock_t *clock, ztimer_base_t *entry)
ztimer_base_t *list = &clock->list;
#ifdef MODULE_PM_LAYERED
/* First timer on the clock's linked list */
if (list->next == NULL && clock->required_pm_mode != ZTIMER_CLOCK_NO_REQUIRED_PM_MODE) {
pm_block(clock->required_pm_mode);
}
#endif
/* Jump past all entries which are set to an earlier target than the new entry */
while (list->next) {
ztimer_base_t *list_entry = list->next;
@ -223,6 +233,13 @@ static void _del_entry_from_list(ztimer_clock_t *clock, ztimer_base_t *entry)
}
list = list->next;
}
#ifdef MODULE_PM_LAYERED
/* The last timer just got removed from the clock's linked list */
if (clock->list.next == NULL && clock->required_pm_mode != ZTIMER_CLOCK_NO_REQUIRED_PM_MODE) {
pm_unblock(clock->required_pm_mode);
}
#endif
}
static ztimer_t *_now_next(ztimer_clock_t *clock)
@ -232,7 +249,13 @@ static ztimer_t *_now_next(ztimer_clock_t *clock)
if (entry && (entry->offset == 0)) {
clock->list.next = entry->next;
if (!entry->next) {
/* The last timer just got removed from the clock's linked list */
clock->last = NULL;
#ifdef MODULE_PM_LAYERED
if (clock->required_pm_mode != ZTIMER_CLOCK_NO_REQUIRED_PM_MODE) {
pm_unblock(clock->required_pm_mode);
}
#endif
}
return (ztimer_t*)entry;
}