284 lines
7.2 KiB
C
284 lines
7.2 KiB
C
/*
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* Copyright (c) 2018 blik GmbH
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* Copyright (c) 2018, NXP
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <drivers/counter.h>
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#include <fsl_rtc.h>
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#include <logging/log.h>
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LOG_MODULE_REGISTER(mcux_rtc, CONFIG_COUNTER_LOG_LEVEL);
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struct mcux_rtc_data {
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counter_alarm_callback_t alarm_callback;
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counter_top_callback_t top_callback;
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void *alarm_user_data;
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void *top_user_data;
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};
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struct mcux_rtc_config {
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struct counter_config_info info;
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RTC_Type *base;
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void (*irq_config_func)(struct device *dev);
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};
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static int mcux_rtc_start(struct device *dev)
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{
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const struct counter_config_info *info = dev->config->config_info;
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const struct mcux_rtc_config *config =
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CONTAINER_OF(info, struct mcux_rtc_config, info);
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RTC_StartTimer(config->base);
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RTC_EnableInterrupts(config->base,
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kRTC_AlarmInterruptEnable |
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kRTC_TimeOverflowInterruptEnable |
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kRTC_TimeInvalidInterruptEnable);
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return 0;
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}
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static int mcux_rtc_stop(struct device *dev)
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{
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const struct counter_config_info *info = dev->config->config_info;
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const struct mcux_rtc_config *config =
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CONTAINER_OF(info, struct mcux_rtc_config, info);
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RTC_DisableInterrupts(config->base,
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kRTC_AlarmInterruptEnable |
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kRTC_TimeOverflowInterruptEnable |
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kRTC_TimeInvalidInterruptEnable);
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RTC_StopTimer(config->base);
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/* clear out any set alarms */
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config->base->TAR = 0;
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return 0;
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}
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static u32_t mcux_rtc_read(struct device *dev)
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{
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const struct counter_config_info *info = dev->config->config_info;
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const struct mcux_rtc_config *config =
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CONTAINER_OF(info, struct mcux_rtc_config, info);
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u32_t ticks = config->base->TSR;
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/*
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* Read TSR seconds twice in case it glitches during an update.
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* This can happen when a read occurs at the time the register is
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* incrementing.
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*/
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if (config->base->TSR == ticks) {
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return ticks;
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}
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ticks = config->base->TSR;
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return ticks;
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}
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static int mcux_rtc_set_alarm(struct device *dev, u8_t chan_id,
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const struct counter_alarm_cfg *alarm_cfg)
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{
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const struct counter_config_info *info = dev->config->config_info;
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const struct mcux_rtc_config *config =
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CONTAINER_OF(info, struct mcux_rtc_config, info);
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struct mcux_rtc_data *data = dev->driver_data;
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u32_t ticks = alarm_cfg->ticks;
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u32_t current = mcux_rtc_read(dev);
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LOG_DBG("Current time is %d ticks", current);
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if (chan_id != 0U) {
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LOG_ERR("Invalid channel id");
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return -EINVAL;
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}
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if (data->alarm_callback != NULL) {
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return -EBUSY;
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}
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if ((alarm_cfg->flags & COUNTER_ALARM_CFG_ABSOLUTE) == 0) {
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ticks += current;
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}
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if (ticks < current) {
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LOG_ERR("Alarm cannot be earlier than current time");
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return -EINVAL;
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}
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data->alarm_callback = alarm_cfg->callback;
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data->alarm_user_data = alarm_cfg->user_data;
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config->base->TAR = ticks;
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LOG_DBG("Alarm set to %d ticks", ticks);
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return 0;
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}
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static int mcux_rtc_cancel_alarm(struct device *dev, u8_t chan_id)
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{
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struct mcux_rtc_data *data = dev->driver_data;
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if (chan_id != 0U) {
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LOG_ERR("Invalid channel id");
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return -EINVAL;
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}
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data->alarm_callback = NULL;
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return 0;
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}
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static int mcux_rtc_set_top_value(struct device *dev,
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const struct counter_top_cfg *cfg)
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{
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const struct counter_config_info *info = dev->config->config_info;
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const struct mcux_rtc_config *config =
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CONTAINER_OF(info, struct mcux_rtc_config, info);
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struct mcux_rtc_data *data = dev->driver_data;
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if (cfg->ticks != info->max_top_value) {
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LOG_ERR("Wrap can only be set to 0x%x.", info->max_top_value);
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return -ENOTSUP;
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}
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if (!(cfg->flags & COUNTER_TOP_CFG_DONT_RESET)) {
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RTC_StopTimer(config->base);
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config->base->TSR = 0;
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RTC_StartTimer(config->base);
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}
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data->top_callback = cfg->callback;
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data->top_user_data = cfg->user_data;
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return 0;
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}
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static u32_t mcux_rtc_get_pending_int(struct device *dev)
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{
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const struct counter_config_info *info = dev->config->config_info;
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const struct mcux_rtc_config *config =
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CONTAINER_OF(info, struct mcux_rtc_config, info);
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return RTC_GetStatusFlags(config->base) & RTC_SR_TAF_MASK;
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}
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static u32_t mcux_rtc_get_top_value(struct device *dev)
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{
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const struct counter_config_info *info = dev->config->config_info;
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return info->max_top_value;
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}
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static u32_t mcux_rtc_get_max_relative_alarm(struct device *dev)
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{
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const struct counter_config_info *info = dev->config->config_info;
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return info->max_top_value;
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}
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static void mcux_rtc_isr(void *arg)
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{
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struct device *dev = arg;
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const struct counter_config_info *info = dev->config->config_info;
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const struct mcux_rtc_config *config =
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CONTAINER_OF(info, struct mcux_rtc_config, info);
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struct mcux_rtc_data *data = dev->driver_data;
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counter_alarm_callback_t cb;
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u32_t current = mcux_rtc_read(dev);
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LOG_DBG("Current time is %d ticks", current);
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if ((RTC_GetStatusFlags(config->base) & RTC_SR_TAF_MASK) &&
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(data->alarm_callback)) {
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cb = data->alarm_callback;
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data->alarm_callback = NULL;
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cb(dev, 0, current, data->alarm_user_data);
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}
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if ((RTC_GetStatusFlags(config->base) & RTC_SR_TOF_MASK) &&
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(data->top_callback)) {
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data->top_callback(dev, data->top_user_data);
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}
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/*
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* Clear any conditions to ack the IRQ
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*
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* callback may have already reset the alarm flag if a new
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* alarm value was programmed to the TAR
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*/
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RTC_StopTimer(config->base);
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if (RTC_GetStatusFlags(config->base) & RTC_SR_TAF_MASK) {
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RTC_ClearStatusFlags(config->base, kRTC_AlarmFlag);
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} else if (RTC_GetStatusFlags(config->base) & RTC_SR_TIF_MASK) {
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RTC_ClearStatusFlags(config->base, kRTC_TimeInvalidFlag);
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} else if (RTC_GetStatusFlags(config->base) & RTC_SR_TOF_MASK) {
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RTC_ClearStatusFlags(config->base, kRTC_TimeOverflowFlag);
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}
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RTC_StartTimer(config->base);
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}
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static int mcux_rtc_init(struct device *dev)
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{
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const struct counter_config_info *info = dev->config->config_info;
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const struct mcux_rtc_config *config =
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CONTAINER_OF(info, struct mcux_rtc_config, info);
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rtc_config_t rtc_config;
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RTC_GetDefaultConfig(&rtc_config);
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RTC_Init(config->base, &rtc_config);
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/* Enable 32kHz oscillator and wait for 1ms to settle */
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config->base->CR |= 0x100;
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k_busy_wait(USEC_PER_MSEC);
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config->irq_config_func(dev);
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return 0;
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}
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static const struct counter_driver_api mcux_rtc_driver_api = {
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.start = mcux_rtc_start,
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.stop = mcux_rtc_stop,
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.read = mcux_rtc_read,
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.set_alarm = mcux_rtc_set_alarm,
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.cancel_alarm = mcux_rtc_cancel_alarm,
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.set_top_value = mcux_rtc_set_top_value,
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.get_pending_int = mcux_rtc_get_pending_int,
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.get_top_value = mcux_rtc_get_top_value,
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.get_max_relative_alarm = mcux_rtc_get_max_relative_alarm,
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};
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static struct mcux_rtc_data mcux_rtc_data_0;
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static void mcux_rtc_irq_config_0(struct device *dev);
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static struct mcux_rtc_config mcux_rtc_config_0 = {
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.base = (RTC_Type *)DT_RTC_MCUX_0_BASE_ADDRESS,
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.irq_config_func = mcux_rtc_irq_config_0,
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.info = {
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.max_top_value = UINT32_MAX,
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.freq = DT_INST_0_NXP_KINETIS_RTC_CLOCK_FREQUENCY /
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DT_INST_0_NXP_KINETIS_RTC_PRESCALER,
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.flags = COUNTER_CONFIG_INFO_COUNT_UP,
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.channels = 1,
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},
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};
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DEVICE_AND_API_INIT(rtc, DT_RTC_MCUX_0_NAME, &mcux_rtc_init,
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&mcux_rtc_data_0, &mcux_rtc_config_0.info,
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POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
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&mcux_rtc_driver_api);
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static void mcux_rtc_irq_config_0(struct device *dev)
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{
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IRQ_CONNECT(DT_RTC_MCUX_0_IRQ, DT_RTC_MCUX_0_IRQ_PRI,
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mcux_rtc_isr, DEVICE_GET(rtc), 0);
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irq_enable(DT_RTC_MCUX_0_IRQ);
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}
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