drivers/counter/counter_mcux_lpc_rtc.c

/*
 * Copyright (c) 2021, NXP
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#define DT_DRV_COMPAT nxp_lpc_rtc

#include <zephyr/drivers/counter.h>
#include <fsl_rtc.h>
#include <zephyr/logging/log.h>

LOG_MODULE_REGISTER(mcux_rtc, CONFIG_COUNTER_LOG_LEVEL);

struct mcux_lpc_rtc_data {
	counter_alarm_callback_t alarm_callback;
	counter_top_callback_t top_callback;
	void *alarm_user_data;
	void *top_user_data;
};

struct mcux_lpc_rtc_config {
	struct counter_config_info info;
	RTC_Type *base;
	void (*irq_config_func)(const struct device *dev);
};

static int mcux_lpc_rtc_start(const struct device *dev)
{
	const struct counter_config_info *info = dev->config;
	const struct mcux_lpc_rtc_config *config =
		CONTAINER_OF(info, struct mcux_lpc_rtc_config, info);

	RTC_StartTimer(config->base);

	return 0;
}

static int mcux_lpc_rtc_stop(const struct device *dev)
{
	const struct counter_config_info *info = dev->config;
	const struct mcux_lpc_rtc_config *config =
		CONTAINER_OF(info, struct mcux_lpc_rtc_config, info);

	RTC_StopTimer(config->base);

	/* clear out any set alarms */
	RTC_SetSecondsTimerMatch(config->base, 0);

	return 0;
}

static uint32_t mcux_lpc_rtc_read(const struct device *dev)
{
	const struct counter_config_info *info = dev->config;
	const struct mcux_lpc_rtc_config *config =
		CONTAINER_OF(info, struct mcux_lpc_rtc_config, info);

	uint32_t ticks = RTC_GetSecondsTimerCount(config->base);

	return ticks;
}

static int mcux_lpc_rtc_get_value(const struct device *dev, uint32_t *ticks)
{
	*ticks = mcux_lpc_rtc_read(dev);
	return 0;
}

static int mcux_lpc_rtc_set_alarm(const struct device *dev, uint8_t chan_id,
			      const struct counter_alarm_cfg *alarm_cfg)
{
	const struct counter_config_info *info = dev->config;
	const struct mcux_lpc_rtc_config *config =
		CONTAINER_OF(info, struct mcux_lpc_rtc_config, info);
	struct mcux_lpc_rtc_data *data = dev->data;

	uint32_t ticks = alarm_cfg->ticks;
	uint32_t current = mcux_lpc_rtc_read(dev);

	LOG_DBG("Current time is %d ticks", current);

	if (chan_id != 0U) {
		LOG_ERR("Invalid channel id");
		return -EINVAL;
	}

	if (data->alarm_callback != NULL) {
		return -EBUSY;
	}

	if ((alarm_cfg->flags & COUNTER_ALARM_CFG_ABSOLUTE) == 0) {
		ticks += current;
	}

	if (ticks < current) {
		LOG_ERR("Alarm cannot be earlier than current time");
		return -EINVAL;
	}

	data->alarm_callback = alarm_cfg->callback;
	data->alarm_user_data = alarm_cfg->user_data;

	RTC_SetSecondsTimerMatch(config->base, ticks);
	LOG_DBG("Alarm set to %d ticks", ticks);

	return 0;
}

static int mcux_lpc_rtc_cancel_alarm(const struct device *dev, uint8_t chan_id)
{
	struct mcux_lpc_rtc_data *data = dev->data;

	if (chan_id != 0U) {
		LOG_ERR("Invalid channel id");
		return -EINVAL;
	}

	data->alarm_callback = NULL;

	return 0;
}

static int mcux_lpc_rtc_set_top_value(const struct device *dev,
				  const struct counter_top_cfg *cfg)
{
	const struct counter_config_info *info = dev->config;
	const struct mcux_lpc_rtc_config *config =
			CONTAINER_OF(info, struct mcux_lpc_rtc_config, info);
	struct mcux_lpc_rtc_data *data = dev->data;

	if (cfg->ticks != info->max_top_value) {
		LOG_ERR("Wrap can only be set to 0x%x.", info->max_top_value);
		return -ENOTSUP;
	}

	if (!(cfg->flags & COUNTER_TOP_CFG_DONT_RESET)) {
		RTC_StopTimer(config->base);
		RTC_SetSecondsTimerCount(config->base, 0);
		RTC_StartTimer(config->base);
	}

	data->top_callback = cfg->callback;
	data->top_user_data = cfg->user_data;

	return 0;
}

static uint32_t mcux_lpc_rtc_get_pending_int(const struct device *dev)
{
	const struct counter_config_info *info = dev->config;
	const struct mcux_lpc_rtc_config *config =
		CONTAINER_OF(info, struct mcux_lpc_rtc_config, info);

	return RTC_GetStatusFlags(config->base) & RTC_CTRL_ALARM1HZ_MASK;
}

static uint32_t mcux_lpc_rtc_get_top_value(const struct device *dev)
{
	const struct counter_config_info *info = dev->config;

	return info->max_top_value;
}

static void mcux_lpc_rtc_isr(const struct device *dev)
{
	const struct counter_config_info *info = dev->config;
	const struct mcux_lpc_rtc_config *config =
		CONTAINER_OF(info, struct mcux_lpc_rtc_config, info);
	struct mcux_lpc_rtc_data *data = dev->data;
	counter_alarm_callback_t cb;
	uint32_t current = mcux_lpc_rtc_read(dev);


	LOG_DBG("Current time is %d ticks", current);

	if ((RTC_GetStatusFlags(config->base) & RTC_CTRL_ALARM1HZ_MASK) &&
	    (data->alarm_callback)) {
		cb = data->alarm_callback;
		data->alarm_callback = NULL;
		cb(dev, 0, current, data->alarm_user_data);
	}

	if (data->top_callback) {
		data->top_callback(dev, data->top_user_data);
	}

	/*
	 * Clear any conditions to ack the IRQ
	 *
	 * callback may have already reset the alarm flag if a new
	 * alarm value was programmed to the TAR
	 */
	RTC_StopTimer(config->base);
	if (RTC_GetStatusFlags(config->base) & RTC_CTRL_ALARM1HZ_MASK) {
		RTC_ClearStatusFlags(config->base, kRTC_AlarmFlag);
	}
	RTC_StartTimer(config->base);
}

static int mcux_lpc_rtc_init(const struct device *dev)
{
	const struct counter_config_info *info = dev->config;
	const struct mcux_lpc_rtc_config *config =
		CONTAINER_OF(info, struct mcux_lpc_rtc_config, info);

	RTC_Init(config->base);

	config->irq_config_func(dev);

	return 0;
}

static const struct counter_driver_api mcux_rtc_driver_api = {
	.start = mcux_lpc_rtc_start,
	.stop = mcux_lpc_rtc_stop,
	.get_value = mcux_lpc_rtc_get_value,
	.set_alarm = mcux_lpc_rtc_set_alarm,
	.cancel_alarm = mcux_lpc_rtc_cancel_alarm,
	.set_top_value = mcux_lpc_rtc_set_top_value,
	.get_pending_int = mcux_lpc_rtc_get_pending_int,
	.get_top_value = mcux_lpc_rtc_get_top_value,
};

#define COUNTER_LPC_RTC_DEVICE(id)					\
	static void mcux_lpc_rtc_irq_config_##id(const struct device *dev);  \
	static const struct mcux_lpc_rtc_config mcux_lpc_rtc_config_##id = { \
		.base = (RTC_Type *)DT_INST_REG_ADDR(id),		\
		.irq_config_func = mcux_lpc_rtc_irq_config_##id,	\
		.info = {						\
			.max_top_value = UINT32_MAX,			\
			.freq = 1,					\
			.flags = COUNTER_CONFIG_INFO_COUNT_UP,		\
			.channels = 1,					\
		},							\
	};								\
	static struct mcux_lpc_rtc_data mcux_lpc_rtc_data_##id;		\
	DEVICE_DT_INST_DEFINE(id, &mcux_lpc_rtc_init, NULL,		\
				&mcux_lpc_rtc_data_##id, &mcux_lpc_rtc_config_##id.info, \
				POST_KERNEL, CONFIG_COUNTER_INIT_PRIORITY,		\
				&mcux_rtc_driver_api);					\
	static void mcux_lpc_rtc_irq_config_##id(const struct device *dev)	\
	{									\
		IRQ_CONNECT(DT_INST_IRQN(id),					\
			DT_INST_IRQ(id, priority),				\
			mcux_lpc_rtc_isr, DEVICE_DT_INST_GET(id), 0);		\
		irq_enable(DT_INST_IRQN(id));					\
	}

DT_INST_FOREACH_STATUS_OKAY(COUNTER_LPC_RTC_DEVICE)