drivers: counter: esp32: Fix alarm stops working

Fix condition in which alarm stops working after a certain amount
of time. Hardware timer is 54-bit, yet it is treated as 32-bit by
the counter driver. To allow alarm event by hardware comparators,
counter high word must be loaded into the register along with
the lower word managed by the driver.

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

Author: Raffael Rostagno

drivers/counter/counter_esp32_tmr.c

@@ -149,7 +149,8 @@ static int counter_esp32_set_alarm(const struct device *dev, uint8_t chan_id,
 	uint32_t ticks = alarm_cfg->ticks;
 	uint32_t top = data->top_data.ticks;
 	uint32_t max_rel_val = data->top_data.ticks;
-	uint32_t now;
+	uint64_t now;
+	uint64_t target;
 	uint32_t diff;
 	int err = 0;
 	bool irq_on_late = 0;
@@ -161,19 +162,22 @@ 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);
 
 	if (absolute == 0) {
-		ticks += now;
-		timer_ll_set_alarm_value(data->hal_ctx.dev, data->hal_ctx.timer_id, ticks);
+		target = now + ticks;
 	} else {
 		irq_on_late = alarm_cfg->flags & COUNTER_ALARM_CFG_EXPIRE_WHEN_LATE;
 		max_rel_val = top - data->top_data.guard_period;
-		timer_ll_set_alarm_value(data->hal_ctx.dev, data->hal_ctx.timer_id,
-					 alarm_cfg->ticks);
+		target = (now & ~0xFFFFFFFFULL) | ticks;
+		if (target < now) {
+			target += (1ULL << 32);
+		}
 	}
 
-	diff = (alarm_cfg->ticks - now);
+	timer_ll_set_alarm_value(data->hal_ctx.dev, data->hal_ctx.timer_id, target);
+
+	diff = (alarm_cfg->ticks - (uint32_t)now);
 	if (diff > max_rel_val) {
 		if (absolute) {
 			err = -ETIME;