diff --git a/chip/g/build.mk b/chip/g/build.mk
index 6b235ced4b..4450faf43a 100644
--- a/chip/g/build.mk
+++ b/chip/g/build.mk
@@ -25,6 +25,7 @@ else
 chip-y += uart.o
 endif
 chip-y+= pmu.o
+chip-y+= trng.o
 chip-$(CONFIG_SPS)+= sps.o
 chip-$(CONFIG_HOSTCMD_SPS)+=sps_hc.o
 chip-$(CONFIG_TPM_SPS)+=sps_tpm.o
diff --git a/chip/g/trng.c b/chip/g/trng.c
new file mode 100644
index 0000000000..e462127da8
--- /dev/null
+++ b/chip/g/trng.c
@@ -0,0 +1,22 @@
+/* Copyright 2015 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "registers.h"
+
+void init_trng(void)
+{
+	GWRITE(TRNG, POWER_DOWN_B, 1);
+	GWRITE(TRNG, GO_EVENT, 1);
+	while (GREAD(TRNG, EMPTY))
+		;
+	GREAD(TRNG, READ_DATA);
+}
+
+uint32_t rand(void)
+{
+	while (GREAD(TRNG, EMPTY))
+		;
+	return GREAD(TRNG, READ_DATA);
+}