[sw, tests] Add DIF Rstmgr sanity test
Simple sanity test that assumes normal power-up, and checks whether
the reset cause is Power-On Reset (POR) alone.
This follow-up is a part of #3454
Signed-off-by: Silvestrs Timofejevs <silvestrst@lowrisc.org>
diff --git a/sw/device/tests/dif/dif_rstmgr_sanitytest.c b/sw/device/tests/dif/dif_rstmgr_sanitytest.c
new file mode 100644
index 0000000..e7d633e
--- /dev/null
+++ b/sw/device/tests/dif/dif_rstmgr_sanitytest.c
@@ -0,0 +1,29 @@
+// Copyright lowRISC contributors.
+// Licensed under the Apache License, Version 2.0, see LICENSE for details.
+// SPDX-License-Identifier: Apache-2.0
+
+#include "sw/device/lib/base/mmio.h"
+#include "sw/device/lib/dif/dif_rstmgr.h"
+#include "sw/device/lib/testing/check.h"
+#include "sw/device/lib/testing/test_main.h"
+
+#include "hw/top_earlgrey/sw/autogen/top_earlgrey.h" // Generated.
+
+static dif_rstmgr_t rstmgr;
+
+const test_config_t kTestConfig;
+
+bool test_main(void) {
+ dif_rstmgr_params_t params = {
+ .base_addr = mmio_region_from_addr(TOP_EARLGREY_RSTMGR_BASE_ADDR),
+ };
+ CHECK(dif_rstmgr_init(params, &rstmgr) == kDifRstmgrOk);
+
+ dif_rstmgr_reset_info_bitfield_t info;
+ CHECK(dif_rstmgr_reset_info_get(&rstmgr, &info) == kDifRstmgrOk);
+
+ // Only POR reset cause should be set (assuming normal power-up).
+ CHECK((info & kDifRstmgrResetInfoPor) == info);
+
+ return true;
+}
