test: Add scratchpad test

The first time the test runs it should pass. After rebooting, the test
should then fail because the scratchpad register is already set.

BRANCH=none
BUG=b:157059753
TEST=Build and flash bloonchipper
     On console:
     > runtest
       => PASS
     > reboot
     > runtest
       => PASS, which is WRONG
TEST=Build and flash dartmonkey
     On console:
     > runtest
       => PASS
     > reboot
     > runtest
       => FAILS, which is CORRECT

Signed-off-by: Tom Hughes <tomhughes@chromium.org>
Change-Id: I348d723d8083ecd0d9f5535785c8049f284a00b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2209189
Commit-Queue: Abe Levkoy <alevkoy@chromium.org>
Reviewed-by: Abe Levkoy <alevkoy@chromium.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/test/scratchpad.c b/test/scratchpad.c
new file mode 100644
index 0000000000..8af697f0ae
--- /dev/null
+++ b/test/scratchpad.c
@@ -0,0 +1,34 @@
+/* Copyright 2020 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 "system.h"
+#include "test_util.h"
+
+/**
+ * The first time this test runs, it should pass. After rebooting, the test
+ * should fail because the scratchpad register is set to 1.
+ */
+test_static int test_scratchpad(void)
+{
+	int rv;
+	uint32_t scratch;
+
+	scratch = system_get_scratchpad();
+	TEST_EQ(scratch, 0, "%d");
+
+	rv = system_set_scratchpad(1);
+	TEST_EQ(rv, EC_SUCCESS, "%d");
+
+	scratch = system_get_scratchpad();
+	TEST_EQ(scratch, 1, "%d");
+
+	return EC_SUCCESS;
+}
+
+void run_test(void)
+{
+	RUN_TEST(test_scratchpad);
+	test_print_result();
+}