diff options
Diffstat (limited to 'chip/it83xx')
| -rw-r--r-- | chip/it83xx/watchdog.c | 40 |
1 files changed, 37 insertions, 3 deletions
diff --git a/chip/it83xx/watchdog.c b/chip/it83xx/watchdog.c index 1bbba6ceb3..ee21170e34 100644 --- a/chip/it83xx/watchdog.c +++ b/chip/it83xx/watchdog.c @@ -16,6 +16,8 @@ /* Panic data goes at the end of RAM. */ static struct panic_data * const pdata_ptr = PANIC_DATA_PTR; +/* Enter critical period or not. */ +static int wdt_warning_fired; /* * We use WDT_EXT_TIMER to trigger an interrupt just before the watchdog timer @@ -25,6 +27,16 @@ static struct panic_data * const pdata_ptr = PANIC_DATA_PTR; /* Magic value to tickle the watchdog register. */ #define ITE83XX_WATCHDOG_MAGIC_WORD 0x5C +/* Start to print warning message. */ +#define ITE83XX_WATCHDOG_WARNING_MS CONFIG_AUX_TIMER_PERIOD_MS +/* The interval to print warning message at critical period. */ +#define ITE83XX_WATCHDOG_CRITICAL_MS 30 + +/* set warning timer */ +static void watchdog_set_warning_timer(int32_t ms, int init) +{ + ext_timer_ms(WDT_EXT_TIMER, EXT_PSR_32P768K_HZ, 1, 1, ms, init, 0); +} void watchdog_warning_irq(void) { @@ -37,7 +49,24 @@ void watchdog_warning_irq(void) /* Reset warning timer. */ IT83XX_ETWD_ETXCTRL(WDT_EXT_TIMER) = 0x03; - panic_printf("Pre-watchdog warning! IPC: %08x\n", get_ipc()); + /* + * The IPC (Interruption Program Counter) is the shadow stack register + * of the PC (Program Counter). It stores the return address of program + * (PC->IPC) when the ISR was called. + * + * The LP (Link Pointer) stores the program address of the next + * sequential instruction for function call return purposes. + * LP = PC+4 after a jump and link instruction (jal). + */ + panic_printf("Pre-WDT warning! IPC:%08x LP:%08x TASK_ID:%d\n", + get_ipc(), ilp, task_get_current()); + + if (!wdt_warning_fired++) + /* + * Reduce interval of warning timer, so we can print more + * warning messages during critical period. + */ + watchdog_set_warning_timer(ITE83XX_WATCHDOG_CRITICAL_MS, 0); } void watchdog_reload(void) @@ -47,6 +76,12 @@ void watchdog_reload(void) /* Restart (tickle) watchdog timer. */ IT83XX_ETWD_EWDKEYR = ITE83XX_WATCHDOG_MAGIC_WORD; + + if (wdt_warning_fired) { + wdt_warning_fired = 0; + /* Reset warning timer to default if watchdog is touched. */ + watchdog_set_warning_timer(ITE83XX_WATCHDOG_WARNING_MS, 0); + } } DECLARE_HOOK(HOOK_TICK, watchdog_reload, HOOK_PRIO_DEFAULT); @@ -72,8 +107,7 @@ int watchdog_init(void) #endif /* Start WDT_EXT_TIMER (CONFIG_AUX_TIMER_PERIOD_MS ms). */ - ext_timer_ms(WDT_EXT_TIMER, EXT_PSR_32P768K_HZ, 1, 1, - CONFIG_AUX_TIMER_PERIOD_MS, 1, 0); + watchdog_set_warning_timer(ITE83XX_WATCHDOG_WARNING_MS, 1); /* Start timer 1 (must be started for watchdog timer to run). */ IT83XX_ETWD_ET1CNTLLR = 0x00; |