cbi: Add CONFIG_EEPROM_CBI_WP

This commit adds the config option, CONFIG_EEPROM_CBI_WP.  It is to be
defined when the EC directly controls the CBI EEPROM WP signal.  The EC
will set the WP according to the result of `system_is_locked()`.  Note
that once the WP is set, the EC must be reset via EC_RST_ODL in order
for the WP to become unset.  This is enabled by the accompanying
hardware.

BUG=b:181769483
BRANCH=None
TEST=`make -j buildall`

Signed-off-by: Aseda Aboagye <aaboagye@google.com>
Change-Id: If490594ab4dd24af98119b01299215b997913b66
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3046412
Tested-by: Aseda Aboagye <aaboagye@chromium.org>
Auto-Submit: Aseda Aboagye <aaboagye@chromium.org>
Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>
Commit-Queue: Aseda Aboagye <aaboagye@chromium.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/test/cbi_wp.c b/test/cbi_wp.c
new file mode 100644
index 0000000000..7bdfa4b0c8
--- /dev/null
+++ b/test/cbi_wp.c
@@ -0,0 +1,56 @@
+/* Copyright 2021 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.
+ *
+ * Test CBI EEPROM WP
+ */
+
+#include "common.h"
+#include "console.h"
+#include "cros_board_info.h"
+#include "gpio.h"
+#include "system.h"
+#include "test_util.h"
+#include "util.h"
+
+static int system_locked;
+
+static void test_setup(void)
+{
+	/* Make sure that write protect is disabled */
+	gpio_set_level(GPIO_WP, 0);
+	gpio_set_level(GPIO_EC_CBI_WP, 0);
+	system_locked = 0;
+}
+
+static void test_teardown(void)
+{
+}
+
+int system_is_locked(void)
+{
+	return system_locked;
+}
+
+DECLARE_EC_TEST(test_wp)
+{
+	int cbi_wp;
+
+	cbi_wp = gpio_get_level(GPIO_EC_CBI_WP);
+	zassert_equal(cbi_wp, 0, NULL);
+
+	cbi_latch_eeprom_wp();
+	cbi_wp = gpio_get_level(GPIO_EC_CBI_WP);
+	zassert_equal(cbi_wp, 1, NULL);
+
+	return EC_SUCCESS;
+}
+
+TEST_SUITE(test_suite_cbi_wp)
+{
+	ztest_test_suite(test_cbi_wp,
+			 ztest_unit_test_setup_teardown(test_wp,
+							test_setup,
+							test_teardown));
+	ztest_run_test_suite(test_cbi_wp);
+}