371 lines
8.4 KiB
C
371 lines
8.4 KiB
C
/*
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* Copyright (c) 2018 Workaround GmbH
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* Copyright (c) 2018 Allterco Robotics
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* Copyright (c) 2018 Linaro Limited
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Source file for the STM32 RTC driver
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*
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*/
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#include <time.h>
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#include <clock_control/stm32_clock_control.h>
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#include <clock_control.h>
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#include <misc/util.h>
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#include <kernel.h>
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#include <soc.h>
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#include <counter.h>
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#include <logging/log.h>
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LOG_MODULE_REGISTER(counter_rtc_stm32, CONFIG_COUNTER_LOG_LEVEL);
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#define T_TIME_OFFSET 946684800
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#if defined(CONFIG_SOC_SERIES_STM32L4X)
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#define RTC_EXTI_LINE LL_EXTI_LINE_18
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#elif defined(CONFIG_SOC_SERIES_STM32F4X) \
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|| defined(CONFIG_SOC_SERIES_STM32F3X) \
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|| defined(CONFIG_SOC_SERIES_STM32F7X)
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#define RTC_EXTI_LINE LL_EXTI_LINE_17
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#endif
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struct rtc_stm32_config {
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struct counter_config_info counter_info;
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struct stm32_pclken pclken;
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LL_RTC_InitTypeDef ll_rtc_config;
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};
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struct rtc_stm32_data {
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counter_alarm_callback_t callback;
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u32_t ticks;
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void *user_data;
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bool absolute;
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};
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#define DEV_DATA(dev) ((struct rtc_stm32_data *)(dev)->driver_data)
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#define DEV_CFG(dev) \
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((const struct rtc_stm32_config * const)(dev)->config->config_info)
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static void rtc_stm32_irq_config(struct device *dev);
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static int rtc_stm32_start(struct device *dev)
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{
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ARG_UNUSED(dev);
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LL_RCC_EnableRTC();
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return 0;
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}
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static int rtc_stm32_stop(struct device *dev)
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{
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ARG_UNUSED(dev);
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LL_RCC_DisableRTC();
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return 0;
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}
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static u32_t rtc_stm32_read(struct device *dev)
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{
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struct tm now = { 0 };
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time_t ts;
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u32_t rtc_date, rtc_time, ticks;
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ARG_UNUSED(dev);
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/* Read time and date registers */
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rtc_time = LL_RTC_TIME_Get(RTC);
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rtc_date = LL_RTC_DATE_Get(RTC);
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/* Convert calendar datetime to UNIX timestamp */
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/* RTC start time: 1st, Jan, 2000 */
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/* time_t start: 1st, Jan, 1900 */
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now.tm_year = 100 +
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__LL_RTC_CONVERT_BCD2BIN(__LL_RTC_GET_YEAR(rtc_date));
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/* tm_mon allowed values are 0-11 */
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now.tm_mon = __LL_RTC_CONVERT_BCD2BIN(__LL_RTC_GET_MONTH(rtc_date)) - 1;
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now.tm_mday = __LL_RTC_CONVERT_BCD2BIN(__LL_RTC_GET_DAY(rtc_date));
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now.tm_hour = __LL_RTC_CONVERT_BCD2BIN(__LL_RTC_GET_HOUR(rtc_time));
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now.tm_min = __LL_RTC_CONVERT_BCD2BIN(__LL_RTC_GET_MINUTE(rtc_time));
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now.tm_sec = __LL_RTC_CONVERT_BCD2BIN(__LL_RTC_GET_SECOND(rtc_time));
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ts = mktime(&now);
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/* Return number of seconds since RTC init */
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ts -= T_TIME_OFFSET;
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__ASSERT(sizeof(time_t) == 8, "unexpected time_t definition");
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ticks = counter_us_to_ticks(dev, ts * USEC_PER_SEC);
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return ticks;
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}
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static int rtc_stm32_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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struct tm alarm_tm;
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time_t alarm_val;
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LL_RTC_AlarmTypeDef rtc_alarm;
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struct rtc_stm32_data *data = DEV_DATA(dev);
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u32_t now = rtc_stm32_read(dev);
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u32_t ticks = alarm_cfg->ticks;
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if (data->callback != NULL) {
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LOG_DBG("Alarm busy\n");
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return -EBUSY;
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}
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data->callback = alarm_cfg->callback;
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data->user_data = alarm_cfg->user_data;
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data->absolute = alarm_cfg->absolute;
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if (!alarm_cfg->absolute) {
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ticks += now;
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}
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LOG_DBG("Set Alarm: %d\n", ticks);
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alarm_val = (time_t)(counter_ticks_to_us(dev, ticks) / USEC_PER_SEC);
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gmtime_r(&alarm_val, &alarm_tm);
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/* Apply ALARM_A */
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rtc_alarm.AlarmTime.TimeFormat = LL_RTC_TIME_FORMAT_AM_OR_24;
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rtc_alarm.AlarmTime.Hours = alarm_tm.tm_hour;
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rtc_alarm.AlarmTime.Minutes = alarm_tm.tm_min;
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rtc_alarm.AlarmTime.Seconds = alarm_tm.tm_sec;
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rtc_alarm.AlarmMask = LL_RTC_ALMA_MASK_NONE;
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rtc_alarm.AlarmDateWeekDaySel = LL_RTC_ALMA_DATEWEEKDAYSEL_DATE;
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rtc_alarm.AlarmDateWeekDay = alarm_tm.tm_mday;
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LL_RTC_DisableWriteProtection(RTC);
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LL_RTC_ALMA_Disable(RTC);
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LL_RTC_EnableWriteProtection(RTC);
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if (LL_RTC_ALMA_Init(RTC, LL_RTC_FORMAT_BIN, &rtc_alarm) != SUCCESS) {
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return -EIO;
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}
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LL_RTC_DisableWriteProtection(RTC);
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LL_RTC_ALMA_Enable(RTC);
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LL_RTC_ClearFlag_ALRA(RTC);
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LL_RTC_EnableIT_ALRA(RTC);
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LL_RTC_EnableWriteProtection(RTC);
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return 0;
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}
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static int rtc_stm32_cancel_alarm(struct device *dev, u8_t chan_id)
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{
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LL_RTC_DisableWriteProtection(RTC);
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LL_RTC_ClearFlag_ALRA(RTC);
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LL_RTC_DisableIT_ALRA(RTC);
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LL_RTC_ALMA_Disable(RTC);
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LL_RTC_EnableWriteProtection(RTC);
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DEV_DATA(dev)->callback = NULL;
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return 0;
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}
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static u32_t rtc_stm32_get_pending_int(struct device *dev)
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{
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return LL_RTC_IsActiveFlag_ALRA(RTC) != 0;
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}
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static u32_t rtc_stm32_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 int rtc_stm32_set_top_value(struct device *dev, u32_t ticks,
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counter_top_callback_t callback,
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void *user_data)
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{
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const struct counter_config_info *info = dev->config->config_info;
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ARG_UNUSED(dev);
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ARG_UNUSED(callback);
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ARG_UNUSED(user_data);
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if (ticks != info->max_top_value) {
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return -ENOTSUP;
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} else {
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return 0;
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}
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}
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static u32_t rtc_stm32_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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void rtc_stm32_isr(void *arg)
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{
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struct device *const dev = (struct device *)arg;
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struct rtc_stm32_data *data = DEV_DATA(dev);
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counter_alarm_callback_t alarm_callback = data->callback;
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u32_t now = rtc_stm32_read(dev);
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if (LL_RTC_IsActiveFlag_ALRA(RTC) != 0) {
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LL_RTC_DisableWriteProtection(RTC);
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LL_RTC_ClearFlag_ALRA(RTC);
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LL_RTC_DisableIT_ALRA(RTC);
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LL_RTC_ALMA_Disable(RTC);
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LL_RTC_EnableWriteProtection(RTC);
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if (alarm_callback != NULL) {
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data->callback = NULL;
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alarm_callback(dev, 0, now, data->user_data);
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}
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}
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LL_EXTI_ClearFlag_0_31(RTC_EXTI_LINE);
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}
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static int rtc_stm32_init(struct device *dev)
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{
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struct device *clk = device_get_binding(STM32_CLOCK_CONTROL_NAME);
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const struct rtc_stm32_config *cfg = DEV_CFG(dev);
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__ASSERT_NO_MSG(clk);
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DEV_DATA(dev)->callback = NULL;
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clock_control_on(clk, (clock_control_subsys_t *) &cfg->pclken);
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LL_PWR_EnableBkUpAccess();
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LL_RCC_ForceBackupDomainReset();
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LL_RCC_ReleaseBackupDomainReset();
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#if defined(CONFIG_COUNTER_RTC_STM32_CLOCK_LSI)
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LL_RCC_LSI_Enable();
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while (LL_RCC_LSI_IsReady() != 1)
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;
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LL_RCC_SetRTCClockSource(LL_RCC_RTC_CLKSOURCE_LSI);
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#else /* CONFIG_COUNTER_RTC_STM32_CLOCK_LSE */
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#if !defined(CONFIG_SOC_SERIES_STM32F4X) && \
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!defined(CONFIG_SOC_SERIES_STM32F2X)
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LL_RCC_LSE_SetDriveCapability(
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CONFIG_COUNTER_RTC_STM32_LSE_DRIVE_STRENGTH);
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#endif /* !CONFIG_SOC_SERIES_STM32F4X && !CONFIG_SOC_SERIES_STM32F2X */
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LL_RCC_LSE_Enable();
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/* Wait until LSE is ready */
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while (LL_RCC_LSE_IsReady() != 1)
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;
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LL_RCC_SetRTCClockSource(LL_RCC_RTC_CLKSOURCE_LSE);
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#endif /* CONFIG_COUNTER_RTC_STM32_CLOCK_SRC */
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LL_RCC_EnableRTC();
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if (LL_RTC_DeInit(RTC) != SUCCESS) {
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return -EIO;
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}
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if (LL_RTC_Init(RTC, ((LL_RTC_InitTypeDef *)
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&cfg->ll_rtc_config)) != SUCCESS) {
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return -EIO;
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}
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#ifdef RTC_CR_BYPSHAD
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LL_RTC_DisableWriteProtection(RTC);
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LL_RTC_EnableShadowRegBypass(RTC);
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LL_RTC_EnableWriteProtection(RTC);
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#endif /* RTC_CR_BYPSHAD */
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LL_EXTI_EnableIT_0_31(RTC_EXTI_LINE);
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LL_EXTI_EnableRisingTrig_0_31(RTC_EXTI_LINE);
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rtc_stm32_irq_config(dev);
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return 0;
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}
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static struct rtc_stm32_data rtc_data;
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static const struct rtc_stm32_config rtc_config = {
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.counter_info = {
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.max_top_value = UINT32_MAX,
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.freq = 1,
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.count_up = true,
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.channels = 1,
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},
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.pclken = {
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.enr = DT_RTC_0_CLOCK_BITS,
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.bus = DT_RTC_0_CLOCK_BUS,
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},
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.ll_rtc_config = {
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.HourFormat = LL_RTC_HOURFORMAT_24HOUR,
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#if defined(CONFIG_COUNTER_RTC_STM32_CLOCK_LSI)
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/* prescaler values for LSI @ 32 KHz */
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.AsynchPrescaler = 0x7F,
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.SynchPrescaler = 0x00F9,
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#else /* CONFIG_COUNTER_RTC_STM32_CLOCK_LSE */
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/* prescaler values for LSE @ 32768 Hz */
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.AsynchPrescaler = 0x7F,
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.SynchPrescaler = 0x00FF,
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#endif
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},
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};
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static const struct counter_driver_api rtc_stm32_driver_api = {
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.start = rtc_stm32_start,
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.stop = rtc_stm32_stop,
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.read = rtc_stm32_read,
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.set_alarm = rtc_stm32_set_alarm,
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.cancel_alarm = rtc_stm32_cancel_alarm,
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.set_top_value = rtc_stm32_set_top_value,
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.get_pending_int = rtc_stm32_get_pending_int,
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.get_top_value = rtc_stm32_get_top_value,
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.get_max_relative_alarm = rtc_stm32_get_max_relative_alarm,
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};
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DEVICE_AND_API_INIT(rtc_stm32, DT_RTC_0_NAME, &rtc_stm32_init,
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&rtc_data, &rtc_config, PRE_KERNEL_1,
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CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &rtc_stm32_driver_api);
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static void rtc_stm32_irq_config(struct device *dev)
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{
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IRQ_CONNECT(DT_RTC_0_IRQ, DT_RTC_0_IRQ_PRI,
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rtc_stm32_isr, DEVICE_GET(rtc_stm32), 0);
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irq_enable(DT_RTC_0_IRQ);
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}
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