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100 lines
2.0 KiB
C
100 lines
2.0 KiB
C
/*
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* Copyright (C) 2019 Inria
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup cpu_fe310
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* @ingroup drivers_periph_wdt
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* @{
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*
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* @file
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* @brief Implementation of the watchdog peripheral interface
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*
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* @author Alexandre Abadie <alexandre.abadie@inria.fr>
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*
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* @}
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*/
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#include <inttypes.h>
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#include <assert.h>
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#include "cpu.h"
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#include "timex.h"
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#include "periph/wdt.h"
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#include "vendor/aon.h"
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#define ENABLE_DEBUG 0
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#include "debug.h"
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void wdt_start(void)
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{
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DEBUG("[wdt] start watchdog\n");
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AON_REG(AON_WDOGKEY) = AON_WDOGKEY_VALUE;
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AON_REG(AON_WDOGCFG) |= AON_WDOGCFG_ENCOREAWAKE;
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}
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void wdt_stop(void)
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{
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DEBUG("[wdt] stop watchdog\n");
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AON_REG(AON_WDOGKEY) = AON_WDOGKEY_VALUE;
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AON_REG(AON_WDOGCFG) &= ~(AON_WDOGCFG_ENCOREAWAKE);
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}
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void wdt_kick(void)
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{
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DEBUG("[wdt] reload the watchdog\n");
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AON_REG(AON_WDOGKEY) = AON_WDOGKEY_VALUE;
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AON_REG(AON_WDOGFEED) = AON_WDOGFEED_VALUE;
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}
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static inline uint8_t _scale(uint32_t count)
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{
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uint8_t scale = 0;
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while (count > (UINT16_MAX - 1)) {
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count >>= 1;
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scale++;
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}
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return scale;
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}
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static inline uint8_t _setup(uint32_t min_time, uint32_t max_time)
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{
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(void)min_time;
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/* Windowed wdt not supported */
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assert(min_time == 0);
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/* Check reset time limit */
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assert((max_time > NWDT_TIME_LOWER_LIMIT) || \
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(max_time < NWDT_TIME_UPPER_LIMIT));
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uint32_t count = ((uint32_t)max_time * RTC_FREQ) / MS_PER_SEC;
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uint8_t scale = _scale(count);
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AON_REG(AON_WDOGKEY) = AON_WDOGKEY_VALUE;
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AON_REG(AON_WDOGCMP) = count;
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return scale;
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}
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void wdt_setup_reboot(uint32_t min_time, uint32_t max_time)
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{
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uint8_t scale = _setup(min_time, max_time);
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AON_REG(AON_WDOGKEY) = AON_WDOGKEY_VALUE;
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AON_REG(AON_WDOGCFG) = AON_WDOGCFG_RSTEN | AON_WDOGCFG_ZEROCMP | scale;
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DEBUG("[wdt] watchdog setup complete\n");
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}
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