1 files changed, 40 insertions, 0 deletions
diff --git a/src/soc/ti/am335x/monotonic_timer.c b/src/soc/ti/am335x/monotonic_timer.c
new file mode 100644
index 0000000000..b57258b6c8
--- /dev/null
+++ b/src/soc/ti/am335x/monotonic_timer.c
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <stdint.h>
+#include <delay.h>
+#include <timer.h>
+
+#include "dmtimer.h"
+
+static struct monotonic_counter {
+	int initialized;
+	struct mono_time time;
+	uint64_t last_value;
+} mono_counter;
+
+static const uint32_t clocks_per_usec = OSC_HZ/1000000;
+
+void timer_monotonic_get(struct mono_time *mt)
+{
+	uint64_t current_tick;
+	uint64_t usecs_elapsed;
+
+	if (!mono_counter.initialized) {
+		init_timer();
+		mono_counter.last_value = dmtimer_raw_value(0);
+		mono_counter.initialized = 1;
+	}
+
+	current_tick = dmtimer_raw_value(0);
+	usecs_elapsed = (current_tick - mono_counter.last_value) /
+							clocks_per_usec;
+
+	/* Update current time and tick values only if a full tick occurred. */
+	if (usecs_elapsed) {
+		mono_time_add_usecs(&mono_counter.time, usecs_elapsed);
+		mono_counter.last_value = current_tick;
+	}
+
+	/* Save result. */
+	*mt = mono_counter.time;
+}