1 files changed, 94 insertions, 0 deletions
diff --git a/common/factory_mode.c b/common/factory_mode.c
new file mode 100644
index 0000000000..b33a0619e5
--- /dev/null
+++ b/common/factory_mode.c
@@ -0,0 +1,94 @@
+/* Copyright 2018 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.
+ */
+
+/* CCD factory enable */
+
+#include "ccd_config.h"
+#include "console.h"
+#include "extension.h"
+#include "hooks.h"
+#include "system.h"
+#include "tpm_registers.h"
+#include "tpm_vendor_cmds.h"
+
+#define CPRINTS(format, args...) cprints(CC_CCD, format, ## args)
+
+static uint8_t ccd_hook_active;
+
+static void ccd_config_changed(void)
+{
+	if (!ccd_hook_active)
+		return;
+
+	CPRINTS("%s: saved, rebooting\n", __func__);
+	cflush();
+	system_reset(SYSTEM_RESET_HARD);
+}
+DECLARE_HOOK(HOOK_CCD_CHANGE, ccd_config_changed, HOOK_PRIO_LAST);
+
+static void factory_enable_failed(void)
+{
+	ccd_hook_active = 0;
+	CPRINTS("factory enable failed");
+	deassert_ec_rst();
+}
+DECLARE_DEFERRED(factory_enable_failed);
+
+/* The below time constants are way longer than should be required in practice:
+ *
+ * Time it takes to finish processing TPM command
+ */
+#define TPM_PROCESSING_TIME (1 * SECOND)
+
+/*
+ * Time it takse TPM reset function to wipe out the NVMEM and reboot the
+ * device.
+ */
+#define TPM_RESET_TIME (10 * SECOND)
+
+/* Total time deep sleep should not be allowed. */
+#define DISABLE_SLEEP_TIME (TPM_PROCESSING_TIME + TPM_RESET_TIME)
+
+static void factory_enable_deferred(void)
+{
+	int rv;
+
+	CPRINTS("%s: reset TPM\n", __func__);
+
+	/*
+	 * Let's make sure the rest of the system is out of the way while TPM
+	 * is being wiped out.
+	 */
+	assert_ec_rst();
+
+	if (tpm_reset_request(1, 1) != EC_SUCCESS) {
+		CPRINTS("%s: TPM reset failed\n", __func__);
+		deassert_ec_rst();
+		return;
+	}
+
+	tpm_reinstate_nvmem_commits();
+
+	CPRINTS("%s: TPM reset done, enabling factory mode\n", __func__);
+
+	ccd_hook_active = 1;
+	rv = ccd_reset_config(CCD_RESET_FACTORY);
+	if (rv != EC_SUCCESS)
+		factory_enable_failed();
+
+	/*
+	 * Make sure we never end up with the EC held in reset, no matter what
+	 * prevents the proper factory reset flow from succeeding.
+	 */
+	hook_call_deferred(&factory_enable_failed_data, TPM_RESET_TIME);
+}
+DECLARE_DEFERRED(factory_enable_deferred);
+
+void enable_ccd_factory_mode(void)
+{
+	delay_sleep_by(DISABLE_SLEEP_TIME);
+	hook_call_deferred(&factory_enable_deferred_data,
+		TPM_PROCESSING_TIME);
+}