drivers: counter: rtc: esp32: Fix overflow case

Fix alarm setting when timer has overflown beyond 32-bit boundary.
Timer is 48-bit, so it requires high word to be programmed along
the 32-bit word managed by the driver.

Signed-off-by: Raffael Rostagno <[email protected]>

Author: Raffael Rostagno

drivers/counter/counter_esp32_rtc.c

@@ -91,13 +91,22 @@ static int counter_esp32_get_value(const struct device *dev, uint32_t *ticks)
 	return 0;
 }
 
+static int counter_esp32_get_value_64(const struct device *dev, uint64_t *ticks)
+{
+	ARG_UNUSED(dev);
+
+	*ticks = rtc_cntl_ll_get_rtc_time();
+
+	return 0;
+}
+
 static int counter_esp32_set_alarm(const struct device *dev, uint8_t chan_id,
 				   const struct counter_alarm_cfg *alarm_cfg)
 {
 	ARG_UNUSED(chan_id);
 	struct counter_esp32_data *data = dev->data;
-	uint32_t now;
-	uint32_t ticks = 0;
+	uint64_t now;
+	uint64_t ticks = 0;
 
 #if defined(CONFIG_SOC_SERIES_ESP32) || defined(CONFIG_SOC_SERIES_ESP32C2) || \
 	defined(CONFIG_SOC_SERIES_ESP32C3)
@@ -109,15 +118,21 @@ static int counter_esp32_set_alarm(const struct device *dev, uint8_t chan_id,
 	data->alarm_cfg.callback = alarm_cfg->callback;
 	data->alarm_cfg.user_data = alarm_cfg->user_data;
 
-	counter_esp32_get_value(dev, &now);
+	counter_esp32_get_value_64(dev, &now);
 
-	ticks = (alarm_cfg->flags & COUNTER_ALARM_CFG_ABSOLUTE) ? alarm_cfg->ticks
-								: now + alarm_cfg->ticks;
+	if (alarm_cfg->flags & COUNTER_ALARM_CFG_ABSOLUTE) {
+		ticks = (now & ~0xFFFFFFFFULL) | alarm_cfg->ticks;
+		if (ticks < now) {
+			ticks += (1ULL << 32);
+		}
+	} else {
+		ticks = now + alarm_cfg->ticks;
+	}
 
 	rtc_cntl_ll_set_wakeup_timer(ticks);
 
 	/* RTC main timer set alarm value */
-	CLEAR_PERI_REG_MASK(RTC_CNTL_SLP_TIMER1_REG, 0xffffffff);
+	CLEAR_PERI_REG_MASK(RTC_CNTL_SLP_TIMER1_REG, 0xFFFFFFFF);
 
 	/* RTC main timer set alarm enable */
 	SET_PERI_REG_MASK(RTC_CNTL_SLP_TIMER1_REG, RTC_CNTL_MAIN_TIMER_ALARM_EN);
@@ -200,6 +215,7 @@ static DEVICE_API(counter, rtc_timer_esp32_api) = {
 	.start = counter_esp32_start,
 	.stop = counter_esp32_stop,
 	.get_value = counter_esp32_get_value,
+	.get_value_64 = counter_esp32_get_value_64,
 	.set_alarm = counter_esp32_set_alarm,
 	.cancel_alarm = counter_esp32_cancel_alarm,
 	.set_top_value = counter_esp32_set_top_value,