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driver: entropy: stm32: Enable PM

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Enable PM on STM32 entropy driver.
Only supports PM_DEVICE for now, runtime support will be added later.

Signed-off-by: Erwan Gouriou <erwan.gouriou@st.com>
This commit is contained in:
Erwan Gouriou 2023-07-26 16:10:43 +02:00 • committed by Carles Cufí
commit 9f52fac1ea
1 changed files with 49 additions and 1 deletions
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50
drivers/entropy/entropy_stm32.c
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@ -24,6 +24,7 @@
#include <stm32_ll_rng.h>
#include <stm32_ll_system.h>
#include <zephyr/sys/printk.h>
#include <zephyr/pm/device.h>
#include <zephyr/drivers/clock_control.h>
#include <zephyr/drivers/clock_control/stm32_clock_control.h>
#include <zephyr/irq.h>
@ -639,13 +640,60 @@ static int entropy_stm32_rng_init(const struct device *dev)
return 0;
}
#ifdef CONFIG_PM_DEVICE
static int entropy_stm32_rng_pm_action(const struct device *dev,
enum pm_device_action action)
{
struct entropy_stm32_rng_dev_data *dev_data = dev->data;
const struct entropy_stm32_rng_dev_cfg *dev_cfg = dev->config;
RNG_TypeDef *rng = dev_data->rng;
int res = 0;
switch (action) {
case PM_DEVICE_ACTION_SUSPEND:
LL_RNG_Disable(rng);
#ifdef CONFIG_SOC_SERIES_STM32WBAX
uint32_t wait_cycles, rng_rate;
if (clock_control_get_rate(dev_data->clock,
(clock_control_subsys_t) &dev_cfg->pclken[0],
&rng_rate) < 0) {
return -EIO;
}
wait_cycles = SystemCoreClock / rng_rate * 2;
for (int i = wait_cycles; i >= 0; i--) {
}
#endif /* CONFIG_SOC_SERIES_STM32WBAX */
res = clock_control_off(dev_data->clock,
(clock_control_subsys_t)&dev_cfg->pclken[0]);
break;
case PM_DEVICE_ACTION_RESUME:
res = clock_control_on(dev_data->clock,
(clock_control_subsys_t)&dev_cfg->pclken[0]);
LL_RNG_Enable(rng);
break;
default:
return -ENOTSUP;
}
return res;
}
#endif /* CONFIG_PM_DEVICE */
static const struct entropy_driver_api entropy_stm32_rng_api = {
.get_entropy = entropy_stm32_rng_get_entropy,
.get_entropy_isr = entropy_stm32_rng_get_entropy_isr
};
PM_DEVICE_DT_INST_DEFINE(0, entropy_stm32_rng_pm_action);
DEVICE_DT_INST_DEFINE(0,
entropy_stm32_rng_init, NULL,
entropy_stm32_rng_init,
PM_DEVICE_DT_INST_GET(0),
&entropy_stm32_rng_data, &entropy_stm32_rng_config,
PRE_KERNEL_1, CONFIG_ENTROPY_INIT_PRIORITY,
&entropy_stm32_rng_api);