esp-idf/components/hal/esp32c3/include/hal/rwdt_ll.h

/*
 * SPDX-FileCopyrightText: 2020-2023 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: Apache-2.0
 */

// The LL layer for Timer Group register operations.
// Note that most of the register operations in this layer are non-atomic operations.

#pragma once

#ifdef __cplusplus
extern "C" {
#endif

#include <stdlib.h>
#include <stdbool.h>
#include "hal/misc.h"
#include "hal/wdt_types.h"
#include "soc/rtc_cntl_periph.h"
#include "soc/rtc_cntl_struct.h"
#include "hal/efuse_ll.h"
#include "esp_attr.h"
#include "esp_assert.h"

/* The value that needs to be written to RTC_CNTL_WDT_WKEY to write-enable the wdt registers */
#define RTC_CNTL_WDT_WKEY_VALUE 0x50D83AA1
/* The value that needs to be written to RTC_CNTL_SWD_WPROTECT_REG to write-enable the wdt registers */
#define RTC_CNTL_SWD_WKEY_VALUE 0x8F1D312A

/* Possible values for RTC_CNTL_WDT_CPU_RESET_LENGTH and RTC_CNTL_WDT_SYS_RESET_LENGTH */
#define RTC_WDT_RESET_LENGTH_100_NS    0
#define RTC_WDT_RESET_LENGTH_200_NS    1
#define RTC_WDT_RESET_LENGTH_300_NS    2
#define RTC_WDT_RESET_LENGTH_400_NS    3
#define RTC_WDT_RESET_LENGTH_500_NS    4
#define RTC_WDT_RESET_LENGTH_800_NS    5
#define RTC_WDT_RESET_LENGTH_1600_NS   6
#define RTC_WDT_RESET_LENGTH_3200_NS   7

//Type check wdt_stage_action_t
ESP_STATIC_ASSERT(WDT_STAGE_ACTION_OFF == RTC_WDT_STG_SEL_OFF, "Add mapping to LL watchdog timeout behavior, since it's no longer naturally compatible with wdt_stage_action_t");
ESP_STATIC_ASSERT(WDT_STAGE_ACTION_INT == RTC_WDT_STG_SEL_INT, "Add mapping to LL watchdog timeout behavior, since it's no longer naturally compatible with wdt_stage_action_t");
ESP_STATIC_ASSERT(WDT_STAGE_ACTION_RESET_CPU == RTC_WDT_STG_SEL_RESET_CPU, "Add mapping to LL watchdog timeout behavior, since it's no longer naturally compatible with wdt_stage_action_t");
ESP_STATIC_ASSERT(WDT_STAGE_ACTION_RESET_SYSTEM == RTC_WDT_STG_SEL_RESET_SYSTEM, "Add mapping to LL watchdog timeout behavior, since it's no longer naturally compatible with wdt_stage_action_t");
ESP_STATIC_ASSERT(WDT_STAGE_ACTION_RESET_RTC == RTC_WDT_STG_SEL_RESET_RTC, "Add mapping to LL watchdog timeout behavior, since it's no longer naturally compatible with wdt_stage_action_t");
//Type check wdt_reset_sig_length_t
ESP_STATIC_ASSERT(WDT_RESET_SIG_LENGTH_100ns == RTC_WDT_RESET_LENGTH_100_NS, "Add mapping to LL watchdog timeout behavior, since it's no longer naturally compatible with wdt_reset_sig_length_t");
ESP_STATIC_ASSERT(WDT_RESET_SIG_LENGTH_200ns == RTC_WDT_RESET_LENGTH_200_NS, "Add mapping to LL watchdog timeout behavior, since it's no longer naturally compatible with wdt_reset_sig_length_t");
ESP_STATIC_ASSERT(WDT_RESET_SIG_LENGTH_300ns == RTC_WDT_RESET_LENGTH_300_NS, "Add mapping to LL watchdog timeout behavior, since it's no longer naturally compatible with wdt_reset_sig_length_t");
ESP_STATIC_ASSERT(WDT_RESET_SIG_LENGTH_400ns == RTC_WDT_RESET_LENGTH_400_NS, "Add mapping to LL watchdog timeout behavior, since it's no longer naturally compatible with wdt_reset_sig_length_t");
ESP_STATIC_ASSERT(WDT_RESET_SIG_LENGTH_500ns == RTC_WDT_RESET_LENGTH_500_NS, "Add mapping to LL watchdog timeout behavior, since it's no longer naturally compatible with wdt_reset_sig_length_t");
ESP_STATIC_ASSERT(WDT_RESET_SIG_LENGTH_800ns == RTC_WDT_RESET_LENGTH_800_NS, "Add mapping to LL watchdog timeout behavior, since it's no longer naturally compatible with wdt_reset_sig_length_t");
ESP_STATIC_ASSERT(WDT_RESET_SIG_LENGTH_1_6us == RTC_WDT_RESET_LENGTH_1600_NS, "Add mapping to LL watchdog timeout behavior, since it's no longer naturally compatible with wdt_reset_sig_length_t");
ESP_STATIC_ASSERT(WDT_RESET_SIG_LENGTH_3_2us == RTC_WDT_RESET_LENGTH_3200_NS, "Add mapping to LL watchdog timeout behavior, since it's no longer naturally compatible with wdt_reset_sig_length_t");

typedef rtc_cntl_dev_t rwdt_dev_t;

#define RWDT_DEV_GET() &RTCCNTL

/**
 * @brief Enable the RWDT
 *
 * @param hw Start address of the peripheral registers.
 */
FORCE_INLINE_ATTR void rwdt_ll_enable(rtc_cntl_dev_t *hw)
{
    hw->wdt_config0.en = 1;
}

/**
 * @brief Disable the RWDT
 *
 * @param hw Start address of the peripheral registers.
 * @note This function does not disable the flashboot mode. Therefore, given that
 *       the MWDT is disabled using this function, a timeout can still occur
 *       if the flashboot mode is simultaneously enabled.
 */
FORCE_INLINE_ATTR void rwdt_ll_disable(rtc_cntl_dev_t *hw)
{
    hw->wdt_config0.en = 0;
}

/**
 * @brief Check if the RWDT is enabled
 *
 * @param hw Start address of the peripheral registers.
 * @return True if RTC WDT is enabled
 */
FORCE_INLINE_ATTR bool rwdt_ll_check_if_enabled(rtc_cntl_dev_t *hw)
{
    return (hw->wdt_config0.en) ? true : false;
}

/**
 * @brief Configure a particular stage of the RWDT
 *
 * @param hw Start address of the peripheral registers.
 * @param stage Which stage to configure
 * @param timeout Number of timer ticks for the stage to timeout (see note).
 * @param behavior What action to take when the stage times out
 *
 * @note The value of of RWDT stage 0 timeout register is special, in
 *       that an implicit multiplier is applied to that value to produce
 *       and effective timeout tick value. The multiplier is dependent
 *       on an EFuse value. Therefore, when configuring stage 0, the valid
 *       values for the timeout argument are:
 *       - If Efuse value is 0, any even number between [2,2*UINT32_MAX]
 *       - If Efuse value is 1, any multiple of 4 between [4,4*UINT32_MAX]
 *       - If Efuse value is 2, any multiple of 8 between [8,8*UINT32_MAX]
 *       - If Efuse value is 3, any multiple of 16 between [16,16*UINT32_MAX]
 */
FORCE_INLINE_ATTR void rwdt_ll_config_stage(rtc_cntl_dev_t *hw, wdt_stage_t stage, uint32_t timeout_ticks, wdt_stage_action_t behavior)
{
    switch (stage) {
    case WDT_STAGE0:
        hw->wdt_config0.stg0 = behavior;
        //Account of implicty multiplier applied to stage 0 timeout tick config value
        hw->wdt_config1 = timeout_ticks >> (1 + efuse_ll_get_wdt_delay_sel());
        break;
    case WDT_STAGE1:
        hw->wdt_config0.stg1 = behavior;
        hw->wdt_config2 = timeout_ticks;
        break;
    case WDT_STAGE2:
        hw->wdt_config0.stg2 = behavior;
        hw->wdt_config3 = timeout_ticks;
        break;
    case WDT_STAGE3:
        hw->wdt_config0.stg3 = behavior;
        hw->wdt_config4 = timeout_ticks;
        break;
    default:
        abort();
    }
}

/**
 * @brief Disable a particular stage of the RWDT
 *
 * @param hw Start address of the peripheral registers.
 * @param stage Which stage to disable
 */
FORCE_INLINE_ATTR void rwdt_ll_disable_stage(rtc_cntl_dev_t *hw, wdt_stage_t stage)
{
    switch (stage) {
    case WDT_STAGE0:
        hw->wdt_config0.stg0 = WDT_STAGE_ACTION_OFF;
        break;
    case WDT_STAGE1:
        hw->wdt_config0.stg1 = WDT_STAGE_ACTION_OFF;
        break;
    case WDT_STAGE2:
        hw->wdt_config0.stg2 = WDT_STAGE_ACTION_OFF;
        break;
    case WDT_STAGE3:
        hw->wdt_config0.stg3 = WDT_STAGE_ACTION_OFF;
        break;
    default:
        abort();
    }
}

/**
 * @brief Set the length of the CPU reset action
 *
 * @param hw Start address of the peripheral registers.
 * @param length Length of CPU reset signal
 */
FORCE_INLINE_ATTR void rwdt_ll_set_cpu_reset_length(rtc_cntl_dev_t *hw, wdt_reset_sig_length_t length)
{
    hw->wdt_config0.cpu_reset_length = length;
}

/**
 * @brief Set the length of the system reset action
 *
 * @param hw Start address of the peripheral registers.
 * @param length Length of system reset signal
 */
FORCE_INLINE_ATTR void rwdt_ll_set_sys_reset_length(rtc_cntl_dev_t *hw, wdt_reset_sig_length_t length)
{
    hw->wdt_config0.sys_reset_length = length;
}

/**
 * @brief Enable/Disable the RWDT flashboot mode.
 *
 * @param hw Start address of the peripheral registers.
 * @param enable True to enable RWDT flashboot mode, false to disable RWDT flashboot mode.
 *
 * @note Flashboot mode is independent and can trigger a WDT timeout event if the
 *       WDT's enable bit is set to 0. Flashboot mode for RWDT is automatically enabled
 *       on flashboot, and should be disabled by software when flashbooting completes.
 */
FORCE_INLINE_ATTR void rwdt_ll_set_flashboot_en(rtc_cntl_dev_t *hw, bool enable)
{
    hw->wdt_config0.flashboot_mod_en = (enable) ? 1 : 0;
}

/**
 * @brief Enable/Disable the CPU0 to be reset on WDT_STAGE_ACTION_RESET_CPU
 *
 * @param hw Start address of the peripheral registers.
 * @param enable True to enable CPU0 to be reset, false to disable.
 */
FORCE_INLINE_ATTR void rwdt_ll_set_procpu_reset_en(rtc_cntl_dev_t *hw, bool enable)
{
    hw->wdt_config0.procpu_reset_en = (enable) ? 1 : 0;
}

/**
 * @brief Enable/Disable the CPU1 to be reset on WDT_STAGE_ACTION_RESET_CPU
 *
 * @param hw Start address of the peripheral registers.
 * @param enable True to enable CPU1 to be reset, false to disable.
 */
FORCE_INLINE_ATTR void rwdt_ll_set_appcpu_reset_en(rtc_cntl_dev_t *hw, bool enable)
{
    hw->wdt_config0.appcpu_reset_en = (enable) ? 1 : 0;
}

/**
 * @brief Enable/Disable the RWDT pause during sleep functionality
 *
 * @param hw Start address of the peripheral registers.
 * @param enable True to enable, false to disable.
 */
FORCE_INLINE_ATTR void rwdt_ll_set_pause_in_sleep_en(rtc_cntl_dev_t *hw, bool enable)
{
    hw->wdt_config0.pause_in_slp = (enable) ? 1 : 0;
}

/**
 * @brief Enable/Disable chip reset on RWDT timeout.
 *
 * A chip reset also resets the analog portion of the chip. It will appear as a
 * POWERON reset rather than an RTC reset.
 *
 * @param hw Start address of the peripheral registers.
 * @param enable True to enable, false to disable.
 */
FORCE_INLINE_ATTR void rwdt_ll_set_chip_reset_en(rtc_cntl_dev_t *hw, bool enable)
{
    hw->wdt_config0.chip_reset_en = (enable) ? 1 : 0;
}

/**
 * @brief Set width of chip reset signal
 *
 * @param hw Start address of the peripheral registers.
 * @param width Width of chip reset signal in terms of number of RTC_SLOW_CLK cycles
 */
FORCE_INLINE_ATTR void rwdt_ll_set_chip_reset_width(rtc_cntl_dev_t *hw, uint32_t width)
{
    HAL_FORCE_MODIFY_U32_REG_FIELD(hw->wdt_config0, chip_reset_width, width);
}

/**
 * @brief Feed the RWDT
 *
 * Resets the current timer count and current stage.
 *
 * @param hw Start address of the peripheral registers.
 */
FORCE_INLINE_ATTR void rwdt_ll_feed(rtc_cntl_dev_t *hw)
{
    hw->wdt_feed.feed = 1;
}

/**
 * @brief Enable write protection of the RWDT registers
 *
 * @param hw Start address of the peripheral registers.
 */
FORCE_INLINE_ATTR void rwdt_ll_write_protect_enable(rtc_cntl_dev_t *hw)
{
    hw->wdt_wprotect = 0;
}

/**
 * @brief Disable write protection of the RWDT registers
 *
 * @param hw Start address of the peripheral registers.
 */
FORCE_INLINE_ATTR void rwdt_ll_write_protect_disable(rtc_cntl_dev_t *hw)
{
    hw->wdt_wprotect = RTC_CNTL_WDT_WKEY_VALUE;
}

/**
 * @brief Enable the RWDT interrupt.
 *
 * @param hw Start address of the peripheral registers.
 * @param enable True to enable RWDT interrupt, false to disable.
 */
FORCE_INLINE_ATTR void rwdt_ll_set_intr_enable(rtc_cntl_dev_t *hw, bool enable)
{
    hw->int_ena.rtc_wdt = (enable) ? 1 : 0;
}

/**
 * @brief Check if the RWDT interrupt has been triggered
 *
 * @param hw Start address of the peripheral registers.
 * @return True if the RWDT interrupt was triggered
 */
FORCE_INLINE_ATTR bool rwdt_ll_check_intr_status(rtc_cntl_dev_t *hw)
{
    return (hw->int_st.rtc_wdt) ? true : false;
}

/**
 * @brief Clear the RWDT interrupt status.
 *
 * @param hw Start address of the peripheral registers.
 */
FORCE_INLINE_ATTR void rwdt_ll_clear_intr_status(rtc_cntl_dev_t *hw)
{
    hw->int_clr.rtc_wdt = 1;
}

#ifdef __cplusplus
}
#endif