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firmware: watchdog-based system reset

This commit is contained in:
Ingo Albrecht 2010-03-07 09:34:36 +01:00 committed by Harald Welte
parent f63cba07f3
commit 83109b58f5
2 changed files with 33 additions and 3 deletions
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33
src/target/firmware/calypso/timer.c
View File

@ -109,6 +109,19 @@ enum wdog_reg {
WD_MODE = 0x04,
};
enum wdog_ctl {
WD_CTL_START = (1 << 7),
WD_CTL_AUTO_RELOAD = (1 << 8)
};
enum wdog_mode {
WD_MODE_DIS_ARM = 0xF5,
WD_MODE_DIS_CONFIRM = 0xA0,
WD_MODE_ENABLE = (1 << 15)
};
#define WD_CTL_PRESCALE(value) (((value)&0x07) << 9)
static void wdog_irq(__unused enum irq_nr nr)
{
puts("=> WATCHDOG\n");
@ -120,10 +133,24 @@ void wdog_enable(int on)
irq_config(IRQ_WATCHDOG, 0, 0, 0);
irq_register_handler(IRQ_WATCHDOG, &wdog_irq);
irq_enable(IRQ_WATCHDOG);
writew(0x8000, WDOG_REG(WD_MODE));
writew(WD_MODE_ENABLE, WDOG_REG(WD_MODE));
} else {
writew(0xF5, WDOG_REG(WD_MODE));
writew(0xA0, WDOG_REG(WD_MODE));
writew(WD_MODE_DIS_ARM, WDOG_REG(WD_MODE));
writew(WD_MODE_DIS_CONFIRM, WDOG_REG(WD_MODE));
}
}
void wdog_reset(void)
{
#if 0
// XXX: this is supposed to reset immediately but does not seem to
writew(0xF5, WDOG_REG(WD_MODE));
writew(0xFF, WDOG_REG(WD_MODE));
#else
// enable watchdog
writew(WD_MODE_ENABLE, WDOG_REG(WD_MODE));
// force expiration
writew(0x0000, WDOG_REG(WD_LOAD_TIMER));
writew(0x0000, WDOG_REG(WD_LOAD_TIMER));
#endif
}

3
src/target/firmware/include/calypso/timer.h
View File

@ -16,6 +16,9 @@ uint16_t hwtimer_read(int num);
/* Enable or disable the watchdog */
void wdog_enable(int on);
/* Reset cpu using watchdog */
void wdog_reset(void);
/* power up the timers */
void hwtimer_init(void);