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>

4 files changed, 71 insertions, 0 deletions

diff --git a/test/build.mk b/test/build.mk
index 6b156ccaf0..ec9e66ead3 100644
--- a/test/build.mk
+++ b/test/build.mk
@@ -20,6 +20,7 @@ test-list-host += bklight_passthru
 test-list-host += body_detection
 test-list-host += button
 test-list-host += cbi
+test-list-host += cbi_wp
 test-list-host += cec
 test-list-host += charge_manager
 test-list-host += charge_manager_drp_charging
@@ -132,6 +133,7 @@ bklight_passthru-y=bklight_passthru.o
 body_detection-y=body_detection.o body_detection_data_literals.o motion_common.o
 button-y=button.o
 cbi-y=cbi.o
+cbi_wp-y=cbi_wp.o
 cec-y=cec.o
 charge_manager-y=charge_manager.o
 charge_manager_drp_charging-y=charge_manager.o
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);
+}
diff --git a/test/cbi_wp.tasklist b/test/cbi_wp.tasklist
new file mode 100644
index 0000000000..e54ea001bd
--- /dev/null
+++ b/test/cbi_wp.tasklist
@@ -0,0 +1,9 @@
+/* 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.
+ */
+
+/**
+ * See CONFIG_TASK_LIST in config.h for details.
+ */
+#define CONFIG_TEST_TASK_LIST  /* No test task */
diff --git a/test/test_config.h b/test/test_config.h
index 8b98dc1087..5afc5d1282 100644
--- a/test/test_config.h
+++ b/test/test_config.h
@@ -40,6 +40,10 @@
 #define CONFIG_BACKLIGHT_REQ_GPIO GPIO_PCH_BKLTEN
 #endif
 
+#ifdef TEST_CBI_WP
+#define CONFIG_EEPROM_CBI_WP
+#endif
+
 #ifdef TEST_FLASH_LOG
 #define CONFIG_CRC8
 #define CONFIG_FLASH_ERASED_VALUE32 (-1U)