4cbfbd0c74
This separation allows to interact with the watchdog from OS code, for example initiating the watchdog very early on boot. Moreover, these changes make the lower-half driver support an already running watchdog, which may happen if there's a bootloader which already started it.
224 lines
6.8 KiB
C
224 lines
6.8 KiB
C
/****************************************************************************
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* arch/arm/src/nrf52/nrf52_wdt.c
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*
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* Copyright (C) 2018 Zglue Inc. All rights reserved.
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* Author: Levin Li <zhiqiang@zglue.com>
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* Author: Alan Carvalho de Assis <acassis@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include "chip.h"
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#include "arm_arch.h"
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#include "arm_internal.h"
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#include "hardware/nrf52_wdt.h"
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#include "nrf52_wdt.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nrf52_wdt_int_enable
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*
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* Description:
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* Enable watchdog interrupt.
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*
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* Input Parameter:
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* int_mask - Interrupt mask
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*
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* Returned Values:
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* None
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*
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****************************************************************************/
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void nrf52_wdt_int_enable(uint32_t int_mask)
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{
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putreg32(int_mask, NRF52_WDT_INTENSET);
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}
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/****************************************************************************
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* Name: nrf52_wdt_task_trigger
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*
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* Description:
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* Starts the watchdog
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*
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* Input Parameter:
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* None
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*
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* Returned Values:
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* None
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*
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****************************************************************************/
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void nrf52_wdt_task_trigger(void)
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{
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putreg32(1, NRF52_WDT_TASKS_START);
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}
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/****************************************************************************
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* Name: nrf52_wdt_reload_register_enable
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*
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* Description:
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* Enable/disable a given reload register
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*
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* Input Parameter:
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* rr_register - Reload request register
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* enable - true to enable, false to disable
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*
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* Returned Values:
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* None
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*
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****************************************************************************/
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void nrf52_wdt_reload_register_enable(int rr_register, bool enable)
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{
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modifyreg32(NRF52_WDT_RREN,
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enable ? 0 : WDT_RREN_RR(rr_register),
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enable ? WDT_RREN_RR(rr_register) : 0);
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}
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/****************************************************************************
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* Name: nrf52_wdt_reload_request_set
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*
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* Description:
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* Setting a specific reload request register
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*
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* Input Parameter:
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* rr_register - Reload request register to set
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*
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* Returned Values:
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* None
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*
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****************************************************************************/
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void nrf52_wdt_reload_request_set(int rr_register)
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{
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/* Each register is 32-bit (4 bytes), then multiply by 4 to get offset */
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putreg32(WDT_RR_VALUE, NRF52_WDT_RR0 + (4 * rr_register));
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}
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/****************************************************************************
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* Name: nrf52_wdt_behaviour_set
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*
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* Description:
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* Configure the watchdog behaviour when the CPU is sleeping or halted
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*
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* Input Parameter:
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* behavior - The behaviour to be configured
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*
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* Returned Values:
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* None
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*
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****************************************************************************/
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void nrf52_wdt_behaviour_set(int behaviour)
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{
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putreg32(behaviour, NRF52_WDT_CONFIG);
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}
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/****************************************************************************
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* Name: nrf52_wdt_reload_value_set
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*
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* Description:
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* Setup the watchdog reload value
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*
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* Input Parameter:
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* reload_value - Watchdog counter initial value
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*
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* Returned Values:
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* None
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*
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****************************************************************************/
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void nrf52_wdt_reload_value_set(uint32_t reload_value)
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{
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putreg32(reload_value, NRF52_WDT_CRV);
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}
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/****************************************************************************
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* Name: nrf52_wdt_reload_value_get
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*
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* Description:
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* Read the watchdog reload value
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*
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* Returned Values:
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* Watchdog counter initial value
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*
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****************************************************************************/
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uint32_t nrf52_wdt_reload_value_get(void)
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{
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return getreg32(NRF52_WDT_CRV);
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}
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/****************************************************************************
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* Name: nrf52_wdt_running
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*
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* Description:
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* Check if watchdog is running
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*
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* Returned Values:
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* true if watchdog is running, false otherwise
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*
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****************************************************************************/
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bool nrf52_wdt_running(void)
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{
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return getreg32(NRF52_WDT_RUNSTATUS);
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}
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