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diff --git a/src/security/tpm/tss.h b/src/security/tpm/tss.h
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+++ b/src/security/tpm/tss.h
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+/* Copyright (c) 2013 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.
+ */
+
+/*
+ * TPM Lightweight Command Library.
+ *
+ * A low-level library for interfacing to TPM hardware or an emulator.
+ */
+
+#ifndef TSS_H_
+#define TSS_H_
+#include <stdint.h>
+#include <types.h>
+
+#include "tss_constants.h"
+
+/*****************************************************************************/
+/* Functions implemented in tlcl.c */
+
+/**
+ * Call this first.  Returns 0 if success, nonzero if error.
+ */
+uint32_t tlcl_lib_init(void);
+
+/**
+ * Perform a raw TPM request/response transaction.
+ */
+uint32_t tlcl_send_receive(const uint8_t *request, uint8_t *response,
+			   int max_length);
+
+/* Commands */
+
+/**
+ * Send a TPM_Startup(ST_CLEAR).  The TPM error code is returned (0 for
+ * success).
+ */
+uint32_t tlcl_startup(void);
+
+/**
+ * Resume by sending a TPM_Startup(ST_STATE).  The TPM error code is returned
+ * (0 for success).
+ */
+uint32_t tlcl_resume(void);
+
+/**
+ * Run the self test.
+ *
+ * Note---this is synchronous.  To run this in parallel with other firmware,
+ * use ContinueSelfTest().  The TPM error code is returned.
+ */
+uint32_t tlcl_self_test_full(void);
+
+/**
+ * Run the self test in the background.
+ */
+uint32_t tlcl_continue_self_test(void);
+
+#if IS_ENABLED(CONFIG_TPM)
+/**
+ * Define a space with permission [perm].  [index] is the index for the space,
+ * [size] the usable data size.  The TPM error code is returned.
+ */
+uint32_t tlcl_define_space(uint32_t index, uint32_t perm, uint32_t size);
+
+#elif IS_ENABLED(CONFIG_TPM2)
+
+/*
+ * Define a TPM space. The define space command TPM command used by the tlcl
+ * layer is enforcing the policy which would not allow to delete the created
+ * space after any PCR0 change from its initial value.
+ */
+uint32_t tlcl_define_space(uint32_t space_index, size_t space_size);
+#endif
+
+/**
+ * Write [length] bytes of [data] to space at [index].  The TPM error code is
+ * returned.
+ */
+uint32_t tlcl_write(uint32_t index, const void *data, uint32_t length);
+
+/**
+ * Read [length] bytes from space at [index] into [data].  The TPM error code
+ * is returned.
+ */
+uint32_t tlcl_read(uint32_t index, void *data, uint32_t length);
+
+/**
+ * Assert physical presence in software.  The TPM error code is returned.
+ */
+uint32_t tlcl_assert_physical_presence(void);
+
+/**
+ * Enable the physical presence command.  The TPM error code is returned.
+ */
+uint32_t tlcl_physical_presence_cmd_enable(void);
+
+/**
+ * Finalize the physical presence settings: sofware PP is enabled, hardware PP
+ * is disabled, and the lifetime lock is set.  The TPM error code is returned.
+ */
+uint32_t tlcl_finalize_physical_presence(void);
+
+/**
+ * Set the nvLocked bit.  The TPM error code is returned.
+ */
+uint32_t tlcl_set_nv_locked(void);
+
+/**
+ * Issue a ForceClear.  The TPM error code is returned.
+ */
+uint32_t tlcl_force_clear(void);
+
+/**
+ * Issue a PhysicalEnable.  The TPM error code is returned.
+ */
+uint32_t tlcl_set_enable(void);
+
+/**
+ * Issue a SetDeactivated.  Pass 0 to activate.  Returns result code.
+ */
+uint32_t tlcl_set_deactivated(uint8_t flag);
+
+/**
+ * Get flags of interest.  Pointers for flags you aren't interested in may
+ * be NULL.  The TPM error code is returned.
+ */
+uint32_t tlcl_get_flags(uint8_t *disable, uint8_t *deactivated,
+			uint8_t *nvlocked);
+
+/**
+ * Set the bGlobalLock flag, which only a reboot can clear.  The TPM error
+ * code is returned.
+ */
+uint32_t tlcl_set_global_lock(void);
+
+/**
+ * Make an NV Ram location read_only.  The TPM error code is returned.
+ */
+uint32_t tlcl_lock_nv_write(uint32_t index);
+
+/**
+ * Perform a TPM_Extend.
+ */
+uint32_t tlcl_extend(int pcr_num, const uint8_t *in_digest,
+		     uint8_t *out_digest);
+
+/**
+ * Get the entire set of permanent flags.
+ */
+uint32_t tlcl_get_permanent_flags(TPM_PERMANENT_FLAGS *pflags);
+
+/**
+ * Disable platform hierarchy. Specific to TPM2. The TPM error code is returned.
+ */
+uint32_t tlcl_disable_platform_hierarchy(void);
+
+/**
+ * CR50 specific tpm command to enable nvmem commits before internal timeout
+ * expires.
+ */
+uint32_t tlcl_cr50_enable_nvcommits(void);
+
+/**
+ * CR50 specific tpm command to restore header(s) of the dormant RO/RW
+ * image(s) and in case there indeed was a dormant image, trigger reboot after
+ * the timeout milliseconds. Note that timeout of zero means "NO REBOOT", not
+ * "IMMEDIATE REBOOT".
+ *
+ * Return value indicates success or failure of accessing the TPM; in case of
+ * success the number of restored headers is saved in num_restored_headers.
+ */
+uint32_t tlcl_cr50_enable_update(uint16_t timeout_ms,
+				 uint8_t *num_restored_headers);
+
+#endif  /* TSS_H_ */