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drivers: watchdog: stm32: add IWDG standby mode configuration #4

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drivers: watchdog: stm32: add IWDG standby mode configuration #4

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33 changes: 33 additions & 0 deletions drivers/watchdog/Kconfig.stm32
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,39 @@ menuconfig IWDG_STM32
help
Enable IWDG driver for STM32 line of MCUs

choice IWDG_STM32_STANDBY
prompt "IWDG behavior in standby mode"
depends on IWDG_STM32
default IWDG_STM32_STANDBY_NO_CHANGE
help
Configure whether the IWDG runs during standby mode.
This modifies the IWDG_STDBY option byte if needed.
Selecting "no change" leaves the option byte as-is.

config IWDG_STM32_STANDBY_NO_CHANGE
bool "No change"
help
Do not modify the IWDG_STDBY option byte.

config IWDG_STM32_STANDBY_FREEZE
bool "Freeze IWDG in standby"
select FLASH_STM32_OPTION_BYTES
select FLASH_EX_OP_ENABLED
help
Clear the IWDG_STDBY option byte so the IWDG is frozen
during standby mode. Prevents spurious watchdog resets
when the system enters low-power standby.

config IWDG_STM32_STANDBY_ACTIVE
bool "IWDG active in standby"
select FLASH_STM32_OPTION_BYTES
select FLASH_EX_OP_ENABLED
help
Set the IWDG_STDBY option byte so the IWDG continues
running during standby mode.

endchoice

config IWDG_STM32_INITIAL_TIMEOUT
int "Value for IWDG timeout in ms"
depends on IWDG_STM32
Expand Down
37 changes: 37 additions & 0 deletions drivers/watchdog/wdt_iwdg_stm32.c
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@

#include <zephyr/drivers/watchdog.h>
#include <zephyr/drivers/clock_control/stm32_clock_control.h>
#include <zephyr/init.h>
#include <zephyr/kernel.h>
#include <zephyr/sys_clock.h>
#include <soc.h>
Expand All @@ -20,6 +21,11 @@
#include <stm32_ll_system.h>
#include <errno.h>

#if defined(CONFIG_IWDG_STM32_STANDBY_FREEZE) || defined(CONFIG_IWDG_STM32_STANDBY_ACTIVE)
#include <zephyr/drivers/flash.h>
#include <zephyr/drivers/flash/stm32_flash_api_extensions.h>
#endif

#include "wdt_iwdg_stm32.h"

#define IWDG_PRESCALER_MIN (4U)
Expand Down Expand Up @@ -266,3 +272,34 @@ DEVICE_DT_INST_DEFINE(0, iwdg_stm32_init, NULL,
&iwdg_stm32_dev_data, &iwdg_stm32_dev_cfg,
POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
&iwdg_stm32_api);

#if defined(CONFIG_IWDG_STM32_STANDBY_FREEZE) || defined(CONFIG_IWDG_STM32_STANDBY_ACTIVE)
static int iwdg_stm32_configure_standby(void)
{
const struct device *flash_dev =
DEVICE_DT_GET(DT_CHOSEN(zephyr_flash_controller));
uint32_t optr;
int rc;

rc = flash_ex_op(flash_dev, FLASH_STM32_EX_OP_OPTB_READ, 0, &optr);
if (rc < 0) {
return rc;
}

if (IS_ENABLED(CONFIG_IWDG_STM32_STANDBY_FREEZE) &&
(optr & FLASH_OPTR_IWDG_STDBY)) {
optr &= ~FLASH_OPTR_IWDG_STDBY;
rc = flash_ex_op(flash_dev, FLASH_STM32_EX_OP_OPTB_WRITE,
(uintptr_t)optr, NULL);
} else if (IS_ENABLED(CONFIG_IWDG_STM32_STANDBY_ACTIVE) &&
!(optr & FLASH_OPTR_IWDG_STDBY)) {
optr |= FLASH_OPTR_IWDG_STDBY;
rc = flash_ex_op(flash_dev, FLASH_STM32_EX_OP_OPTB_WRITE,
(uintptr_t)optr, NULL);
}

return rc;
}

SYS_INIT(iwdg_stm32_configure_standby, APPLICATION, 0);
#endif /* CONFIG_IWDG_STM32_STANDBY_FREEZE || CONFIG_IWDG_STM32_STANDBY_ACTIVE */
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