1ca196841a
The early TPM probe was done directly in tis.c ignoring the lower layer that provides appropriate access to the chip. Move this into a tpm_vendor_probe() function so it can use iic_tpm_read() with all of the built-in delays and semantics instead of calling i2c_readb() directly from the wrong layer. This fixes early init failures that were seen with the cr50 i2c tpm on the reef mainboard. Change-Id: I9bb3b820d10f6e2ea24c57b90cf0edc813cdc7e0 Signed-off-by: Duncan Laurie <dlaurie@chromium.org> Reviewed-on: https://review.coreboot.org/16527 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Furquan Shaikh <furquan@google.com> Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
131 lines
3.0 KiB
C
131 lines
3.0 KiB
C
/*
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* Copyright (C) 2011 Infineon Technologies
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*
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* Authors:
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* Peter Huewe <huewe.external@infineon.com>
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*
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* Version: 2.1.1
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*
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* Description:
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* Device driver for TCG/TCPA TPM (trusted platform module).
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* Specifications at www.trustedcomputinggroup.org
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*
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* It is based on the Linux kernel driver tpm.c from Leendert van
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* Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __DRIVERS_TPM_SLB9635_I2C_TPM_H__
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#define __DRIVERS_TPM_SLB9635_I2C_TPM_H__
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#include <stdint.h>
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enum tpm_timeout {
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TPM_TIMEOUT = 1, /* msecs */
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};
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/* Size of external transmit buffer (used for stack buffer in tpm_sendrecv) */
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#define TPM_BUFSIZE 1260
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/* Index of fields in TPM command buffer */
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#define TPM_CMD_SIZE_BYTE 2
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#define TPM_CMD_ORDINAL_BYTE 6
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/* Index of Count field in TPM response buffer */
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#define TPM_RSP_SIZE_BYTE 2
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#define TPM_RSP_RC_BYTE 6
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struct tpm_chip;
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struct tpm_vendor_specific {
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uint8_t req_complete_mask;
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uint8_t req_complete_val;
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uint8_t req_canceled;
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int irq;
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int (*recv)(struct tpm_chip *, uint8_t *, size_t);
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int (*send)(struct tpm_chip *, uint8_t *, size_t);
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void (*cancel)(struct tpm_chip *);
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uint8_t(*status)(struct tpm_chip *);
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int locality;
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};
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struct tpm_chip {
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int is_open;
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struct tpm_vendor_specific vendor;
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};
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struct tpm_input_header {
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uint16_t tag;
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uint32_t length;
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uint32_t ordinal;
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} __attribute__ ((packed));
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struct tpm_output_header {
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uint16_t tag;
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uint32_t length;
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uint32_t return_code;
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} __attribute__ ((packed));
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struct timeout_t {
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uint32_t a;
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uint32_t b;
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uint32_t c;
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uint32_t d;
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} __attribute__ ((packed));
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struct duration_t {
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uint32_t tpm_short;
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uint32_t tpm_medium;
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uint32_t tpm_long;
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} __attribute__ ((packed));
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typedef union {
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struct timeout_t timeout;
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struct duration_t duration;
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} cap_t;
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struct tpm_getcap_params_in {
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uint32_t cap;
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uint32_t subcap_size;
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uint32_t subcap;
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} __attribute__ ((packed));
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struct tpm_getcap_params_out {
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uint32_t cap_size;
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cap_t cap;
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} __attribute__ ((packed));
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typedef union {
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struct tpm_input_header in;
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struct tpm_output_header out;
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} tpm_cmd_header;
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typedef union {
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struct tpm_getcap_params_out getcap_out;
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struct tpm_getcap_params_in getcap_in;
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} tpm_cmd_params;
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struct tpm_cmd_t {
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tpm_cmd_header header;
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tpm_cmd_params params;
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} __attribute__ ((packed));
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/* ---------- Interface for TPM vendor ------------ */
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int tpm_vendor_probe(unsigned bus, uint32_t addr);
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int tpm_vendor_init(struct tpm_chip *chip, unsigned bus, uint32_t dev_addr);
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void tpm_vendor_cleanup(struct tpm_chip *chip);
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#endif /* __DRIVERS_TPM_SLB9635_I2C_TPM_H__ */
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