315 lines
7.2 KiB
C
315 lines
7.2 KiB
C
/*
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* Copyright (c) 2018 Workaround GmbH
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* Copyright (c) 2018 Allterco Robotics
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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 <drivers/clock_control.h>
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#include <sys/util.h>
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#include <kernel.h>
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#include <soc.h>
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#include <drivers/rtc.h>
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#if defined(CONFIG_SOC_SERIES_STM32L4X)
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#define 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 EXTI_LINE LL_EXTI_LINE_17
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#endif
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#define EPOCH_OFFSET 946684800
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struct rtc_stm32_config {
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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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void (*cb_fn)(struct device *dev);
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struct k_sem sem;
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};
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#define DEV_DATA(dev) ((struct rtc_stm32_data *const)(dev)->driver_data)
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#define DEV_SEM(dev) (&DEV_DATA(dev)->sem)
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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 int rtc_stm32_set_alarm(struct device *dev, const u32_t alarm_val);
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static void rtc_stm32_irq_config(struct device *dev);
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static void rtc_stm32_enable(struct device *dev)
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{
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LL_RCC_EnableRTC();
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}
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static void rtc_stm32_disable(struct device *dev)
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{
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LL_RCC_DisableRTC();
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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;
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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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now.tm_year = 100 + __LL_RTC_CONVERT_BCD2BIN(
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__LL_RTC_GET_YEAR(rtc_date));
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/* tm_mon starts from 0 */
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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 2000-01-01 00:00:00 */
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ts -= EPOCH_OFFSET;
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return (u32_t)ts;
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}
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static int rtc_stm32_set_alarm(struct device *dev, const u32_t alarm_val)
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{
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struct tm alarm_tm;
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time_t alarm_ts;
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LL_RTC_AlarmTypeDef rtc_alarm;
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u32_t now = rtc_stm32_read(dev);
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/* The longest period we can match for universally is the
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duration of the shortest month */
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if ((alarm_val - now) > (RTC_ALARM_DAY * 28)) {
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return -ENOTSUP;
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}
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/* Convert seconds since 2000-01-01 00:00:00 to calendar datetime */
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alarm_ts = alarm_val;
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alarm_ts += EPOCH_OFFSET;
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gmtime_r(&alarm_ts, &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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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_set_config(struct device *dev, struct rtc_config *cfg)
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{
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int result = 0;
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time_t init_ts = 0;
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struct tm init_tm = { 0 };
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LL_RTC_DateTypeDef rtc_date = { 0 };
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LL_RTC_TimeTypeDef rtc_time = { 0 };
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/* Convert seconds since 2000-01-01 00:00:00 to calendar datetime */
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init_ts = cfg->init_val;
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init_ts += EPOCH_OFFSET;
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gmtime_r(&init_ts, &init_tm);
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rtc_date.Year = init_tm.tm_year % 100;
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/* tm_mon starts from 0 */
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rtc_date.Month = init_tm.tm_mon + 1;
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rtc_date.Day = init_tm.tm_mday;
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rtc_date.WeekDay = init_tm.tm_wday + 1;
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rtc_time.TimeFormat = LL_RTC_TIME_FORMAT_AM_OR_24;
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rtc_time.Hours = init_tm.tm_hour;
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rtc_time.Minutes = init_tm.tm_min;
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rtc_time.Seconds = init_tm.tm_sec;
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k_sem_take(DEV_SEM(dev), K_FOREVER);
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if (cfg->cb_fn != NULL) {
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DEV_DATA(dev)->cb_fn = cfg->cb_fn;
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}
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if (LL_RTC_DATE_Init(RTC, LL_RTC_FORMAT_BIN, &rtc_date) != SUCCESS) {
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result = -EIO;
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goto fin;
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}
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if (LL_RTC_TIME_Init(RTC, LL_RTC_FORMAT_BIN, &rtc_time) != SUCCESS) {
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result = -EIO;
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goto fin;
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}
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if (cfg->alarm_enable) {
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rtc_stm32_set_alarm(dev, cfg->alarm_val);
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}
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fin:
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k_sem_give(DEV_SEM(dev));
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return result;
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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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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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if (LL_RTC_IsActiveFlag_ALRA(RTC) != 0) {
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if (DEV_DATA(dev)->cb_fn != NULL) {
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DEV_DATA(dev)->cb_fn(dev);
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}
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LL_RTC_ClearFlag_ALRA(RTC);
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LL_RTC_DisableIT_ALRA(RTC);
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}
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LL_EXTI_ClearFlag_0_31(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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k_sem_init(DEV_SEM(dev), 1, UINT_MAX);
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DEV_DATA(dev)->cb_fn = NULL;
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if (clock_control_on(clk,
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(clock_control_subsys_t *) &cfg->pclken) != 0) {
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return -EIO;
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}
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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_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_RTC_STM32_CLOCK_LSE */
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LL_RCC_LSE_SetDriveCapability(CONFIG_RTC_STM32_LSE_DRIVE_STRENGTH);
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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
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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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LL_RTC_EnableShadowRegBypass(RTC);
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LL_EXTI_EnableIT_0_31(EXTI_LINE);
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LL_EXTI_EnableRisingTrig_0_31(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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.pclken = {
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.enr = LL_APB1_GRP1_PERIPH_PWR,
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.bus = STM32_CLOCK_BUS_APB1,
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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_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_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 rtc_driver_api rtc_api = {
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.enable = rtc_stm32_enable,
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.disable = rtc_stm32_disable,
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.read = rtc_stm32_read,
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.set_config = rtc_stm32_set_config,
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.set_alarm = rtc_stm32_set_alarm,
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.get_pending_int = rtc_stm32_get_pending_int,
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};
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DEVICE_AND_API_INIT(rtc_stm32, CONFIG_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_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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