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drivers: nrf_rtc_timer: force init of interrupt and event enabling

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Make sure that the interrupt and event routing enable bits have the
reset values in case the Zephyr firmware image is chain-loaded.
When started by MCUboot, these registers values aren't the reset values,
but then Zephyr initializes them in same way. Yet, when the Zephyr
firmware image is chain-loaded by nRF5 bootloader, they may have values
that cause the scheduler to behave in unexpected ways.

Signed-off-by: Giancarlo Stasi <giancarlo.stasi.co@gmail.com>
This commit is contained in:
Giancarlo Stasi 2023-03-02 18:43:14 +01:00 • committed by Carles Cufí
commit 654d2176d7
1 changed files with 12 additions and 0 deletions
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12
drivers/timer/nrf_rtc_timer.c
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@ -666,6 +666,18 @@ static int sys_clock_driver_init(const struct device *dev)
(IS_ENABLED(CONFIG_SYSTEM_CLOCK_WAIT_FOR_AVAILABILITY) ?
CLOCK_CONTROL_NRF_LF_START_AVAILABLE :
CLOCK_CONTROL_NRF_LF_START_STABLE);
uint32_t mask = NRF_RTC_INT_TICK_MASK |
NRF_RTC_INT_OVERFLOW_MASK |
NRF_RTC_INT_COMPARE0_MASK |
NRF_RTC_INT_COMPARE1_MASK |
NRF_RTC_INT_COMPARE2_MASK |
NRF_RTC_INT_COMPARE3_MASK;
/* Reset interrupt enabling to expected reset values */
nrf_rtc_int_disable(RTC, mask);
/* Reset event routing enabling to expected reset values */
nrf_rtc_event_disable(RTC, mask);
/* TODO: replace with counter driver to access RTC */
nrf_rtc_prescaler_set(RTC, 0);