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/*
* SPDX-FileCopyrightText: 2016-2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdlib.h>
#include <ctype.h>
#include "sdkconfig.h"
#include "esp_types.h"
#include "esp_log.h"
#include "soc/rtc_periph.h"
#include "soc/rtc.h"
#include "soc/periph_defs.h"
#include "freertos/FreeRTOS.h"
#include "freertos/semphr.h"
#include "freertos/timers.h"
#include "esp_intr_alloc.h"
#include "sys/lock.h"
#include "esp_private/rtc_ctrl.h"
#include "esp_attr.h"
#ifndef NDEBUG
// Enable built-in checks in queue.h in debug builds
#define INVARIANTS
#endif
#include "sys/queue.h"
#if !SOC_LP_PERIPH_SHARE_INTERRUPT // TODO: IDF-8008
static const char *TAG = "rtc_module";
#endif
// rtc_spinlock is used by other peripheral drivers
portMUX_TYPE rtc_spinlock = portMUX_INITIALIZER_UNLOCKED;
#if SOC_LP_PERIPH_SHARE_INTERRUPT // TODO: IDF-8008
#define NOT_REGISTERED (-1)
// Disable the interrupt which cannot work without cache.
static DRAM_ATTR uint32_t rtc_intr_cache;
static DRAM_ATTR uint32_t rtc_intr_enabled;
static DRAM_ATTR int rtc_isr_cpu = NOT_REGISTERED; // Unused number
static void s_rtc_isr_noniram_hook(uint32_t rtc_intr_mask);
static void s_rtc_isr_noniram_hook_relieve(uint32_t rtc_intr_mask);
/*---------------------------------------------------------------
INTERRUPT HANDLER
---------------------------------------------------------------*/
typedef struct rtc_isr_handler_ {
uint32_t mask;
intr_handler_t handler;
void* handler_arg;
uint32_t flags;
SLIST_ENTRY(rtc_isr_handler_) next;
} rtc_isr_handler_t;
static DRAM_ATTR SLIST_HEAD(rtc_isr_handler_list_, rtc_isr_handler_) s_rtc_isr_handler_list =
SLIST_HEAD_INITIALIZER(s_rtc_isr_handler_list);
static DRAM_ATTR portMUX_TYPE s_rtc_isr_handler_list_lock = portMUX_INITIALIZER_UNLOCKED;
static intr_handle_t s_rtc_isr_handle;
IRAM_ATTR static void rtc_isr(void* arg)
{
uint32_t status = REG_READ(RTC_CNTL_INT_ST_REG);
rtc_isr_handler_t* it;
portENTER_CRITICAL_ISR(&s_rtc_isr_handler_list_lock);
SLIST_FOREACH(it, &s_rtc_isr_handler_list, next) {
if (it->mask & status) {
portEXIT_CRITICAL_ISR(&s_rtc_isr_handler_list_lock);
(*it->handler)(it->handler_arg);
portENTER_CRITICAL_ISR(&s_rtc_isr_handler_list_lock);
}
}
portEXIT_CRITICAL_ISR(&s_rtc_isr_handler_list_lock);
REG_WRITE(RTC_CNTL_INT_CLR_REG, status);
}
static esp_err_t rtc_isr_ensure_installed(void)
{
esp_err_t err = ESP_OK;
portENTER_CRITICAL(&s_rtc_isr_handler_list_lock);
if (s_rtc_isr_handle) {
goto out;
}
REG_WRITE(RTC_CNTL_INT_ENA_REG, 0);
REG_WRITE(RTC_CNTL_INT_CLR_REG, UINT32_MAX);
err = esp_intr_alloc(ETS_RTC_CORE_INTR_SOURCE, ESP_INTR_FLAG_IRAM, &rtc_isr, NULL, &s_rtc_isr_handle);
if (err != ESP_OK) {
goto out;
}
rtc_isr_cpu = esp_intr_get_cpu(s_rtc_isr_handle);
out:
portEXIT_CRITICAL(&s_rtc_isr_handler_list_lock);
return err;
}
#endif // SOC_LP_PERIPH_SHARE_INTERRUPT TODO: IDF-8008
esp_err_t rtc_isr_register(intr_handler_t handler, void* handler_arg, uint32_t rtc_intr_mask, uint32_t flags)
{
#if !SOC_LP_PERIPH_SHARE_INTERRUPT // TODO: IDF-8008
ESP_EARLY_LOGW(TAG, "rtc_isr_register() has not been implemented yet");
return ESP_OK;
#else
esp_err_t err = rtc_isr_ensure_installed();
if (err != ESP_OK) {
return err;
}
rtc_isr_handler_t* item = heap_caps_malloc(sizeof(*item), MALLOC_CAP_INTERNAL);
if (item == NULL) {
return ESP_ERR_NO_MEM;
}
item->handler = handler;
item->handler_arg = handler_arg;
item->mask = rtc_intr_mask;
item->flags = flags;
portENTER_CRITICAL(&s_rtc_isr_handler_list_lock);
if (flags & RTC_INTR_FLAG_IRAM) {
s_rtc_isr_noniram_hook(rtc_intr_mask);
} else {
s_rtc_isr_noniram_hook_relieve(rtc_intr_mask);
}
SLIST_INSERT_HEAD(&s_rtc_isr_handler_list, item, next);
portEXIT_CRITICAL(&s_rtc_isr_handler_list_lock);
return ESP_OK;
#endif
}
esp_err_t rtc_isr_deregister(intr_handler_t handler, void* handler_arg)
{
#if !SOC_LP_PERIPH_SHARE_INTERRUPT // TODO: IDF-8008
ESP_EARLY_LOGW(TAG, "rtc_isr_deregister() has not been implemented yet");
return ESP_OK;
#else
rtc_isr_handler_t* it;
rtc_isr_handler_t* prev = NULL;
bool found = false;
portENTER_CRITICAL(&s_rtc_isr_handler_list_lock);
SLIST_FOREACH(it, &s_rtc_isr_handler_list, next) {
if (it->handler == handler && it->handler_arg == handler_arg) {
if (it == SLIST_FIRST(&s_rtc_isr_handler_list)) {
SLIST_REMOVE_HEAD(&s_rtc_isr_handler_list, next);
} else {
SLIST_REMOVE_AFTER(prev, next);
}
found = true;
if (it->flags & RTC_INTR_FLAG_IRAM) {
s_rtc_isr_noniram_hook_relieve(it->mask);
}
free(it);
break;
}
prev = it;
}
portEXIT_CRITICAL(&s_rtc_isr_handler_list_lock);
return found ? ESP_OK : ESP_ERR_INVALID_STATE;
#endif
}
#if SOC_LP_PERIPH_SHARE_INTERRUPT // TODO: IDF-8008
/**
* @brief This helper function can be used to avoid the interrupt to be triggered with cache disabled.
* There are lots of different signals on RTC module (i.e. sleep_wakeup, wdt, brownout_detect, etc.)
* We might want some of them can be triggered with cache disabled, some are not. Therefore, this function
* is created to avoid those which do not want to be triggered with cache disabled.
*
* @param rtc_intr_mask the mask of the rtc interrupt.
*/
static void s_rtc_isr_noniram_hook(uint32_t rtc_intr_mask)
{
rtc_intr_cache |= rtc_intr_mask;
}
static void s_rtc_isr_noniram_hook_relieve(uint32_t rtc_intr_mask)
{
rtc_intr_cache &= ~rtc_intr_mask;
}
#endif
IRAM_ATTR void rtc_isr_noniram_disable(uint32_t cpu)
{
#if SOC_LP_PERIPH_SHARE_INTERRUPT // TODO: IDF-8008
if (rtc_isr_cpu == cpu) {
rtc_intr_enabled |= RTCCNTL.int_ena.val;
RTCCNTL.int_ena.val &= rtc_intr_cache;
}
#endif
}
IRAM_ATTR void rtc_isr_noniram_enable(uint32_t cpu)
{
#if SOC_LP_PERIPH_SHARE_INTERRUPT // TODO: IDF-8008
if (rtc_isr_cpu == cpu) {
RTCCNTL.int_ena.val = rtc_intr_enabled;
rtc_intr_enabled = 0;
}
#endif
}
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