/* * This file is part of the coreboot project. * * Copyright 2011 Google Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #ifndef TPM_H_ #define TPM_H_ #include <stddef.h> #include <stdint.h> enum tis_access { TPM_ACCESS_VALID = (1 << 7), TPM_ACCESS_ACTIVE_LOCALITY = (1 << 5), TPM_ACCESS_REQUEST_PENDING = (1 << 2), TPM_ACCESS_REQUEST_USE = (1 << 1), TPM_ACCESS_ESTABLISHMENT = (1 << 0), }; enum tis_status { TPM_STS_FAMILY_SHIFT = 26, TPM_STS_FAMILY_MASK = (0x3 << TPM_STS_FAMILY_SHIFT), TPM_STS_FAMILY_TPM_2_0 = (1 << TPM_STS_FAMILY_SHIFT), TPM_STS_FAMILY_TPM_1_2 = (0 << TPM_STS_FAMILY_SHIFT), TPM_STS_RESET_ESTABLISHMENT = (1 << 25), TPM_STS_COMMAND_CANCEL = (1 << 24), TPM_STS_BURST_COUNT_SHIFT = 8, TPM_STS_BURST_COUNT_MASK = (0xFFFF << TPM_STS_BURST_COUNT_SHIFT), TPM_STS_VALID = (1 << 7), TPM_STS_COMMAND_READY = (1 << 6), TPM_STS_GO = (1 << 5), TPM_STS_DATA_AVAIL = (1 << 4), TPM_STS_DATA_EXPECT = (1 << 3), TPM_STS_SELF_TEST_DONE = (1 << 2), TPM_STS_RESPONSE_RETRY = (1 << 1), }; /* * tis_init() * * Initialize the TPM device. Returns 0 on success or -1 on * failure (in case device probing did not succeed). */ int tis_init(void); /* * tis_open() * * Requests access to locality 0 for the caller. After all commands have been * completed the caller is supposed to call tis_close(). * * Returns 0 on success, -1 on failure. */ int tis_open(void); /* * tis_close() * * terminate the currect session with the TPM by releasing the locked * locality. Returns 0 on success of -1 on failure (in case lock * removal did not succeed). */ int tis_close(void); /* * tis_sendrecv() * * Send the requested data to the TPM and then try to get its response * * @sendbuf - buffer of the data to send * @send_size size of the data to send * @recvbuf - memory to save the response to * @recv_len - pointer to the size of the response buffer * * Returns 0 on success (and places the number of response bytes at recv_len) * or -1 on failure. */ int tis_sendrecv(const u8 *sendbuf, size_t send_size, u8 *recvbuf, size_t *recv_len); void init_tpm(int s3resume); /* * tis_plat_irq_status() * * Check tpm irq and clear it. * * Returns 1 when irq pending or 0 when not. */ int tis_plat_irq_status(void); #endif /* TPM_H_ */