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/*
* Watchdog
*
* Copyright (c) 2020 Michael Buesch <m@bues.ch>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "compat.h"
#include "watchdog.h"
#include "util.h"
/* Write to the WDT hardware register. */
static alwaysinline void wdt_setup(uint8_t wdto, bool wde, bool wdie)
{
const uint8_t first = (uint8_t)((1u << WDCE) | (1u << WDE));
const uint8_t secnd = (uint8_t)((wde ? (1u << WDE) : 0u) |
(wdie ? (1u << WDIE) : 0u) |
(wdto & 0x07u));
if (_SFR_IO_ADDR(WDTCR) > 0x3F) {
__asm__ __volatile__(
"wdr \n"
"sts %[WDTCR_], %[FIRST_] \n"
"sts %[WDTCR_], %[SECND_] \n"
: /* no out */
: [WDTCR_] "M" (_SFR_MEM_ADDR(WDTCR)),
[FIRST_] "r" (first),
[SECND_] "r" (secnd)
);
} else {
__asm__ __volatile__(
"wdr \n"
"out %[WDTCR_], %[FIRST_] \n"
"out %[WDTCR_], %[SECND_] \n"
: /* no out */
: [WDTCR_] "I" (_SFR_IO_ADDR(WDTCR)),
[FIRST_] "r" (first),
[SECND_] "r" (secnd)
);
}
}
/* Early watchdog timer initialization. */
static void section_init3 wdt_early_init(void)
{
/* Clear WDRF (and all other reset info bits). */
MCUSR = 0;
/* Enable the watchdog. */
wdt_setup(WDTO_2S, true, false);
}
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