nuttx/arch/arm/src/nrf52/nrf52_wdt.c
Matias N 4cbfbd0c74 nrf52_wdt: split into low-level API and watchdog driver lower-half
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.
2020-10-29 20:17:33 -03:00

224 lines
6.8 KiB
C

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