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drivers: serial: stm32: Implement PM_DEVICE mode support

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Implement PM_DEVICE support and treatment of _pm_action hook.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
This commit is contained in:
Erwan Gouriou 2022-08-03 14:39:59 +02:00 • committed by Fabio Baltieri
commit a439c04eb4
1 changed files with 71 additions and 1 deletions
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72
drivers/serial/uart_stm32.c
View file

@ -22,6 +22,7 @@
#include <zephyr/drivers/uart.h>
#include <zephyr/drivers/clock_control.h>
#include <zephyr/pm/policy.h>
#include <zephyr/pm/device.h>
#ifdef CONFIG_UART_ASYNC_API
#include <zephyr/drivers/dma/dma_stm32.h>
@ -1693,6 +1694,73 @@ static int uart_stm32_init(const struct device *dev)
#endif
}
#ifdef CONFIG_PM_DEVICE
static void uart_stm32_suspend_setup(const struct device *dev)
{
const struct uart_stm32_config *config = dev->config;
#ifdef USART_ISR_BUSY
/* Make sure that no USART transfer is on-going */
while (LL_USART_IsActiveFlag_BUSY(config->usart) == 1) {
}
#endif
while (LL_USART_IsActiveFlag_TC(config->usart) == 0) {
}
#ifdef USART_ISR_REACK
/* Make sure that USART is ready for reception */
while (LL_USART_IsActiveFlag_REACK(config->usart) == 0) {
}
#endif
/* Clear OVERRUN flag */
LL_USART_ClearFlag_ORE(config->usart);
}
static int uart_stm32_pm_action(const struct device *dev,
enum pm_device_action action)
{
const struct uart_stm32_config *config = dev->config;
struct uart_stm32_data *data = dev->data;
int err;
switch (action) {
case PM_DEVICE_ACTION_RESUME:
/* Set pins to active state */
err = pinctrl_apply_state(config->pcfg, PINCTRL_STATE_DEFAULT);
if (err < 0) {
return err;
}
/* enable clock */
err = clock_control_on(data->clock, (clock_control_subsys_t)&config->pclken[0]);
if (err != 0) {
LOG_ERR("Could not enable (LP)UART clock");
return err;
}
break;
case PM_DEVICE_ACTION_SUSPEND:
uart_stm32_suspend_setup(dev);
/* Stop device clock */
err = clock_control_off(data->clock, (clock_control_subsys_t)&config->pclken[0]);
if (err != 0) {
LOG_ERR("Could not enable (LP)UART clock");
return err;
}
/* Move pins to sleep state */
err = pinctrl_apply_state(config->pcfg, PINCTRL_STATE_SLEEP);
if (err < 0) {
return err;
}
break;
default:
return -ENOTSUP;
}
return 0;
}
#endif /* CONFIG_PM_DEVICE */
#ifdef CONFIG_UART_ASYNC_API
/* src_dev and dest_dev should be 'MEMORY' or 'PERIPHERAL'. */
@ -1797,9 +1865,11 @@ static struct uart_stm32_data uart_stm32_data_##index = { \
UART_DMA_CHANNEL(index, tx, TX, MEMORY, PERIPHERAL) \
}; \
\
PM_DEVICE_DT_INST_DEFINE(index, uart_stm32_pm_action); \
\
DEVICE_DT_INST_DEFINE(index, \
&uart_stm32_init, \
NULL, \
PM_DEVICE_DT_INST_GET(index), \
&uart_stm32_data_##index, &uart_stm32_cfg_##index, \
PRE_KERNEL_1, CONFIG_SERIAL_INIT_PRIORITY, \
&uart_stm32_driver_api); \