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drivers: entropy: stm32 entropy driver add semaphore protection

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Add a semaphore to protect the disable access to the RNG peripheral
when the PM is going to suspend mode.
The change does not affect other stm32 than CONFIG_SOC_SERIES_STM32WBX
or CONFIG_STM32H7_DUAL_CORE

Signed-off-by: Francois Ramu <francois.ramu@st.com>
This commit is contained in:
Francois Ramu 2024-05-16 15:53:40 +02:00 • committed by Alberto Escolar
commit 447bdea7ff
1 changed files with 23 additions and 2 deletions
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25
drivers/entropy/entropy_stm32.c
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@ -112,6 +112,10 @@ static int entropy_stm32_suspend(void)
RNG_TypeDef *rng = dev_data->rng;
int res;
#if defined(CONFIG_SOC_SERIES_STM32WBX) || defined(CONFIG_STM32H7_DUAL_CORE)
/* Prevent concurrent access with PM */
z_stm32_hsem_lock(CFG_HW_RNG_SEMID, HSEM_LOCK_WAIT_FOREVER);
#endif /* CONFIG_SOC_SERIES_STM32WBX || CONFIG_STM32H7_DUAL_CORE */
LL_RNG_Disable(rng);
#ifdef CONFIG_SOC_SERIES_STM32WBAX
@ -136,6 +140,10 @@ static int entropy_stm32_suspend(void)
res = clock_control_off(dev_data->clock,
(clock_control_subsys_t)&dev_cfg->pclken[0]);
#if defined(CONFIG_SOC_SERIES_STM32WBX) || defined(CONFIG_STM32H7_DUAL_CORE)
z_stm32_hsem_unlock(CFG_HW_RNG_SEMID);
#endif /* CONFIG_SOC_SERIES_STM32WBX || CONFIG_STM32H7_DUAL_CORE */
return res;
}
@ -710,7 +718,12 @@ static int entropy_stm32_rng_pm_action(const struct device *dev,
switch (action) {
case PM_DEVICE_ACTION_SUSPEND:
res = entropy_stm32_suspend();
#if defined(CONFIG_SOC_SERIES_STM32WBX) || defined(CONFIG_STM32H7_DUAL_CORE)
/* Lock to Prevent concurrent access with PM */
z_stm32_hsem_lock(CFG_HW_RNG_SEMID, HSEM_LOCK_WAIT_FOREVER);
/* Call release_rng instead of entropy_stm32_suspend to avoid double hsem_unlock */
#endif /* CONFIG_SOC_SERIES_STM32WBX || CONFIG_STM32H7_DUAL_CORE */
release_rng();
break;
case PM_DEVICE_ACTION_RESUME:
if (IS_ENABLED(CONFIG_PM_S2RAM)) {
@ -724,7 +737,15 @@ static int entropy_stm32_rng_pm_action(const struct device *dev,
entropy_stm32_rng_init(dev);
} else if (!entropy_stm32_rng_data.filling_pools) {
/* Resume RNG only if it was suspended during filling pool */
entropy_stm32_suspend();
#if defined(CONFIG_SOC_SERIES_STM32WBX) || defined(CONFIG_STM32H7_DUAL_CORE)
/* Lock to Prevent concurrent access with PM */
z_stm32_hsem_lock(CFG_HW_RNG_SEMID, HSEM_LOCK_WAIT_FOREVER);
/*
* Call release_rng instead of entropy_stm32_suspend
* to avoid double hsem_unlock
*/
#endif /* CONFIG_SOC_SERIES_STM32WBX || CONFIG_STM32H7_DUAL_CORE */
release_rng();
}
#endif /* health_test_config */
} else {