/*
* Copyright (c) 2018 Workaround GmbH
* Copyright (c) 2018 Allterco Robotics
* Copyright (c) 2018 Linaro Limited
*
* SPDX-License-Identifier: Apache-2.0
*
* Source file for the STM32 RTC driver
*
*/
#include <time.h>
#include <clock_control/stm32_clock_control.h>
#include <clock_control.h>
#include <misc/util.h>
#include <kernel.h>
#include <soc.h>
#include <counter.h>
#include <logging/log.h>
LOG_MODULE_REGISTER(counter_rtc_stm32, CONFIG_COUNTER_LOG_LEVEL);
#define T_TIME_OFFSET 2088656896 /* RTC Date reset value: Jan, 1st, xx00 */
#if defined(CONFIG_SOC_SERIES_STM32L4X)
#define RTC_EXTI_LINE LL_EXTI_LINE_18
#elif defined(CONFIG_SOC_SERIES_STM32F4X) \
|| defined(CONFIG_SOC_SERIES_STM32F3X) \
|| defined(CONFIG_SOC_SERIES_STM32F7X)
#define RTC_EXTI_LINE LL_EXTI_LINE_17
#endif
struct rtc_stm32_config {
struct counter_config_info counter_info;
struct stm32_pclken pclken;
LL_RTC_InitTypeDef ll_rtc_config;
};
struct rtc_stm32_data {
counter_alarm_callback_t callback;
u32_t ticks;
void *user_data;
bool absolute;
};
#define DEV_DATA(dev) ((struct rtc_stm32_data *)(dev)->driver_data)
#define DEV_CFG(dev) \
((const struct rtc_stm32_config * const)(dev)->config->config_info)
static void rtc_stm32_irq_config(struct device *dev);
static int rtc_stm32_start(struct device *dev)
{
ARG_UNUSED(dev);
LL_RCC_EnableRTC();
return 0;
}
static int rtc_stm32_stop(struct device *dev)
{
ARG_UNUSED(dev);
LL_RCC_DisableRTC();
return 0;
}
static u32_t rtc_stm32_read(struct device *dev)
{
struct tm now = { 0 };
time_t ts;
u32_t rtc_date, rtc_time, ticks;
ARG_UNUSED(dev);
/* Read time and date registers */
rtc_time = LL_RTC_TIME_Get(RTC);
rtc_date = LL_RTC_DATE_Get(RTC);
/* Convert calendar datetime to UNIX timestamp */
now.tm_year = __LL_RTC_CONVERT_BCD2BIN(__LL_RTC_GET_YEAR(rtc_date));
now.tm_mon = __LL_RTC_CONVERT_BCD2BIN(__LL_RTC_GET_MONTH(rtc_date));
now.tm_mday = __LL_RTC_CONVERT_BCD2BIN(__LL_RTC_GET_DAY(rtc_date));
now.tm_hour = __LL_RTC_CONVERT_BCD2BIN(__LL_RTC_GET_HOUR(rtc_time));
now.tm_min = __LL_RTC_CONVERT_BCD2BIN(__LL_RTC_GET_MINUTE(rtc_time));
now.tm_sec = __LL_RTC_CONVERT_BCD2BIN(__LL_RTC_GET_SECOND(rtc_time));
ts = mktime(&now);
/* Return number of seconds since RTC init */
ts -= T_TIME_OFFSET;
__ASSERT(sizeof(time_t) == 8, "unexpected time_t definition");
/* Since SDK 0.10.0, newlib defines sizeof(time_t) = 8, */
/* so ts requires cast to u32_t before conversion from s to us. */
ticks = counter_us_to_ticks(dev, (u64_t)((u32_t)ts * USEC_PER_SEC));
return ticks;
}
static int rtc_stm32_set_alarm(struct device *dev, u8_t chan_id,
const struct counter_alarm_cfg *alarm_cfg)
{
struct tm alarm_tm;
time_t alarm_val;
LL_RTC_AlarmTypeDef rtc_alarm;
struct rtc_stm32_data *data = DEV_DATA(dev);
u32_t now = rtc_stm32_read(dev);
u32_t ticks = alarm_cfg->ticks;
if (data->callback != NULL) {
LOG_DBG("Alarm busy\n");
return -EBUSY;
}
data->callback = alarm_cfg->callback;
data->user_data = alarm_cfg->user_data;
data->absolute = alarm_cfg->absolute;
if (!alarm_cfg->absolute) {
ticks += now;
}
LOG_DBG("Set Alarm: %d\n", ticks);
alarm_val = (time_t)(counter_ticks_to_us(dev, ticks) / USEC_PER_SEC);
gmtime_r(&alarm_val, &alarm_tm);
/* Apply ALARM_A */
rtc_alarm.AlarmTime.TimeFormat = LL_RTC_TIME_FORMAT_AM_OR_24;
rtc_alarm.AlarmTime.Hours = alarm_tm.tm_hour;
rtc_alarm.AlarmTime.Minutes = alarm_tm.tm_min;
rtc_alarm.AlarmTime.Seconds = alarm_tm.tm_sec;
rtc_alarm.AlarmMask = LL_RTC_ALMA_MASK_NONE;
rtc_alarm.AlarmDateWeekDaySel = LL_RTC_ALMA_DATEWEEKDAYSEL_DATE;
rtc_alarm.AlarmDateWeekDay = alarm_tm.tm_mday;
LL_RTC_DisableWriteProtection(RTC);
LL_RTC_ALMA_Disable(RTC);
LL_RTC_EnableWriteProtection(RTC);
if (LL_RTC_ALMA_Init(RTC, LL_RTC_FORMAT_BIN, &rtc_alarm) != SUCCESS) {
return -EIO;
}
LL_RTC_DisableWriteProtection(RTC);
LL_RTC_ALMA_Enable(RTC);
LL_RTC_ClearFlag_ALRA(RTC);
LL_RTC_EnableIT_ALRA(RTC);
LL_RTC_EnableWriteProtection(RTC);
return 0;
}
static int rtc_stm32_cancel_alarm(struct device *dev, u8_t chan_id)
{
LL_RTC_DisableWriteProtection(RTC);
LL_RTC_ClearFlag_ALRA(RTC);
LL_RTC_DisableIT_ALRA(RTC);
LL_RTC_ALMA_Disable(RTC);
LL_RTC_EnableWriteProtection(RTC);
DEV_DATA(dev)->callback = NULL;
return 0;
}
static u32_t rtc_stm32_get_pending_int(struct device *dev)
{
return LL_RTC_IsActiveFlag_ALRA(RTC) != 0;
}
static u32_t rtc_stm32_get_top_value(struct device *dev)
{
const struct counter_config_info *info = dev->config->config_info;
return info->max_top_value;
}
static int rtc_stm32_set_top_value(struct device *dev, u32_t ticks,
counter_top_callback_t callback,
void *user_data)
{
const struct counter_config_info *info = dev->config->config_info;
ARG_UNUSED(dev);
ARG_UNUSED(callback);
ARG_UNUSED(user_data);
if (ticks != info->max_top_value) {
return -ENOTSUP;
} else {
return 0;
}
}
static u32_t rtc_stm32_get_max_relative_alarm(struct device *dev)
{
const struct counter_config_info *info = dev->config->config_info;
return info->max_top_value;
}
void rtc_stm32_isr(void *arg)
{
struct device *const dev = (struct device *)arg;
struct rtc_stm32_data *data = DEV_DATA(dev);
counter_alarm_callback_t alarm_callback = data->callback;
u32_t now = rtc_stm32_read(dev);
if (LL_RTC_IsActiveFlag_ALRA(RTC) != 0) {
LL_RTC_DisableWriteProtection(RTC);
LL_RTC_ClearFlag_ALRA(RTC);
LL_RTC_DisableIT_ALRA(RTC);
LL_RTC_ALMA_Disable(RTC);
LL_RTC_EnableWriteProtection(RTC);
if (alarm_callback != NULL) {
data->callback = NULL;
alarm_callback(dev, 0, now, data->user_data);
}
}
LL_EXTI_ClearFlag_0_31(RTC_EXTI_LINE);
}
static int rtc_stm32_init(struct device *dev)
{
struct device *clk = device_get_binding(STM32_CLOCK_CONTROL_NAME);
const struct rtc_stm32_config *cfg = DEV_CFG(dev);
__ASSERT_NO_MSG(clk);
DEV_DATA(dev)->callback = NULL;
clock_control_on(clk, (clock_control_subsys_t *) &cfg->pclken);
LL_PWR_EnableBkUpAccess();
LL_RCC_ForceBackupDomainReset();
LL_RCC_ReleaseBackupDomainReset();
#if defined(CONFIG_COUNTER_RTC_STM32_CLOCK_LSI)
LL_RCC_LSI_Enable();
while (LL_RCC_LSI_IsReady() != 1)
;
LL_RCC_SetRTCClockSource(LL_RCC_RTC_CLKSOURCE_LSI);
#else /* CONFIG_COUNTER_RTC_STM32_CLOCK_LSE */
#ifndef(CONFIG_SOC_SERIES_STM32F4X)
LL_RCC_LSE_SetDriveCapability(
CONFIG_COUNTER_RTC_STM32_LSE_DRIVE_STRENGTH);
#endif /* !CONFIG_SOC_SERIES_STM32F4X */
LL_RCC_LSE_Enable();
/* Wait until LSE is ready */
while (LL_RCC_LSE_IsReady() != 1)
;
LL_RCC_SetRTCClockSource(LL_RCC_RTC_CLKSOURCE_LSE);
#endif /* CONFIG_COUNTER_RTC_STM32_CLOCK_SRC */
LL_RCC_EnableRTC();
if (LL_RTC_DeInit(RTC) != SUCCESS) {
return -EIO;
}
if (LL_RTC_Init(RTC, ((LL_RTC_InitTypeDef *)
&cfg->ll_rtc_config)) != SUCCESS) {
return -EIO;
}
#ifdef RTC_CR_BYPSHAD
LL_RTC_DisableWriteProtection(RTC);
LL_RTC_EnableShadowRegBypass(RTC);
LL_RTC_EnableWriteProtection(RTC);
#endif /* RTC_CR_BYPSHAD */
LL_EXTI_EnableIT_0_31(RTC_EXTI_LINE);
LL_EXTI_EnableRisingTrig_0_31(RTC_EXTI_LINE);
rtc_stm32_irq_config(dev);
return 0;
}
static struct rtc_stm32_data rtc_data;
static const struct rtc_stm32_config rtc_config = {
.counter_info = {
.max_top_value = UINT32_MAX,
.freq = 1,
.count_up = true,
.channels = 1,
},
.pclken = {
.enr = DT_RTC_0_CLOCK_BITS,
.bus = DT_RTC_0_CLOCK_BUS,
},
.ll_rtc_config = {
.HourFormat = LL_RTC_HOURFORMAT_24HOUR,
#if defined(CONFIG_COUNTER_RTC_STM32_CLOCK_LSI)
/* prescaler values for LSI @ 32 KHz */
.AsynchPrescaler = 0x7F,
.SynchPrescaler = 0x00F9,
#else /* CONFIG_COUNTER_RTC_STM32_CLOCK_LSE */
/* prescaler values for LSE @ 32768 Hz */
.AsynchPrescaler = 0x7F,
.SynchPrescaler = 0x00FF,
#endif
},
};
static const struct counter_driver_api rtc_stm32_driver_api = {
.start = rtc_stm32_start,
.stop = rtc_stm32_stop,
.read = rtc_stm32_read,
.set_alarm = rtc_stm32_set_alarm,
.cancel_alarm = rtc_stm32_cancel_alarm,
.set_top_value = rtc_stm32_set_top_value,
.get_pending_int = rtc_stm32_get_pending_int,
.get_top_value = rtc_stm32_get_top_value,
.get_max_relative_alarm = rtc_stm32_get_max_relative_alarm,
};
DEVICE_AND_API_INIT(rtc_stm32, DT_RTC_0_NAME, &rtc_stm32_init,
&rtc_data, &rtc_config, PRE_KERNEL_1,
CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &rtc_stm32_driver_api);
static void rtc_stm32_irq_config(struct device *dev)
{
IRQ_CONNECT(DT_RTC_0_IRQ, DT_RTC_0_IRQ_PRI,
rtc_stm32_isr, DEVICE_GET(rtc_stm32), 0);
irq_enable(DT_RTC_0_IRQ);
}