630 lines
12 KiB
C
630 lines
12 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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* 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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* Version: 2.1.1
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <config.h>
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#include <common.h>
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#include <compiler.h>
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#include <fdtdec.h>
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#include <i2c.h>
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#include <tpm.h>
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#include <asm-generic/errno.h>
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#include <linux/types.h>
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#include <linux/unaligned/be_byteshift.h>
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#include "tpm_private.h"
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DECLARE_GLOBAL_DATA_PTR;
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/* TPM configuration */
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struct tpm {
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int i2c_bus;
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int slave_addr;
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char inited;
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int old_bus;
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} tpm;
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/* Global structure for tpm chip data */
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static struct tpm_chip g_chip;
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enum tpm_duration {
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TPM_SHORT = 0,
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TPM_MEDIUM = 1,
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TPM_LONG = 2,
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TPM_UNDEFINED,
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};
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/* Extended error numbers from linux (see errno.h) */
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#define ECANCELED 125 /* Operation Canceled */
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/* Timer frequency. Corresponds to msec timer resolution*/
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#define HZ 1000
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#define TPM_MAX_ORDINAL 243
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#define TPM_MAX_PROTECTED_ORDINAL 12
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#define TPM_PROTECTED_ORDINAL_MASK 0xFF
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#define TPM_CMD_COUNT_BYTE 2
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#define TPM_CMD_ORDINAL_BYTE 6
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/*
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* Array with one entry per ordinal defining the maximum amount
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* of time the chip could take to return the result. The ordinal
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* designation of short, medium or long is defined in a table in
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* TCG Specification TPM Main Part 2 TPM Structures Section 17. The
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* values of the SHORT, MEDIUM, and LONG durations are retrieved
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* from the chip during initialization with a call to tpm_get_timeouts.
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*/
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static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
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TPM_UNDEFINED, /* 0 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 5 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 10 */
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TPM_SHORT,
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};
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static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
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TPM_UNDEFINED, /* 0 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 5 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 10 */
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TPM_SHORT,
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TPM_MEDIUM,
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TPM_LONG,
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TPM_LONG,
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TPM_MEDIUM, /* 15 */
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TPM_SHORT,
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TPM_SHORT,
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TPM_MEDIUM,
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TPM_LONG,
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TPM_SHORT, /* 20 */
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TPM_SHORT,
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TPM_MEDIUM,
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TPM_MEDIUM,
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TPM_MEDIUM,
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TPM_SHORT, /* 25 */
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TPM_SHORT,
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TPM_MEDIUM,
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TPM_SHORT,
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TPM_SHORT,
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TPM_MEDIUM, /* 30 */
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TPM_LONG,
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TPM_MEDIUM,
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT, /* 35 */
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TPM_MEDIUM,
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TPM_MEDIUM,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_MEDIUM, /* 40 */
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TPM_LONG,
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TPM_MEDIUM,
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT, /* 45 */
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT,
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TPM_LONG,
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TPM_MEDIUM, /* 50 */
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TPM_MEDIUM,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 55 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_MEDIUM, /* 60 */
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TPM_MEDIUM,
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TPM_MEDIUM,
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TPM_SHORT,
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TPM_SHORT,
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TPM_MEDIUM, /* 65 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 70 */
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TPM_SHORT,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 75 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_LONG, /* 80 */
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TPM_UNDEFINED,
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TPM_MEDIUM,
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TPM_LONG,
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TPM_SHORT,
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TPM_UNDEFINED, /* 85 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 90 */
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT,
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TPM_UNDEFINED, /* 95 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_MEDIUM, /* 100 */
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TPM_SHORT,
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TPM_SHORT,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 105 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 110 */
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT, /* 115 */
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TPM_SHORT,
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TPM_SHORT,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_LONG, /* 120 */
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TPM_LONG,
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TPM_MEDIUM,
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TPM_UNDEFINED,
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TPM_SHORT,
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TPM_SHORT, /* 125 */
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TPM_SHORT,
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TPM_LONG,
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT, /* 130 */
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TPM_MEDIUM,
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TPM_UNDEFINED,
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TPM_SHORT,
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TPM_MEDIUM,
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TPM_UNDEFINED, /* 135 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 140 */
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TPM_SHORT,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 145 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 150 */
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TPM_MEDIUM,
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TPM_MEDIUM,
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TPM_SHORT,
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TPM_SHORT,
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TPM_UNDEFINED, /* 155 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 160 */
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 165 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_LONG, /* 170 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 175 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_MEDIUM, /* 180 */
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TPM_SHORT,
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TPM_MEDIUM,
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TPM_MEDIUM,
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TPM_MEDIUM,
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TPM_MEDIUM, /* 185 */
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TPM_SHORT,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 190 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 195 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 200 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT,
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TPM_SHORT, /* 205 */
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT,
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TPM_MEDIUM, /* 210 */
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TPM_UNDEFINED,
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TPM_MEDIUM,
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TPM_MEDIUM,
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TPM_MEDIUM,
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TPM_UNDEFINED, /* 215 */
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TPM_MEDIUM,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT,
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TPM_SHORT, /* 220 */
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT,
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TPM_SHORT,
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TPM_UNDEFINED, /* 225 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 230 */
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TPM_LONG,
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TPM_MEDIUM,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED, /* 235 */
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_UNDEFINED,
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TPM_SHORT, /* 240 */
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TPM_UNDEFINED,
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TPM_MEDIUM,
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};
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/* Returns max number of milliseconds to wait */
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static unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
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u32 ordinal)
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{
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int duration_idx = TPM_UNDEFINED;
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int duration = 0;
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if (ordinal < TPM_MAX_ORDINAL) {
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duration_idx = tpm_ordinal_duration[ordinal];
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} else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
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TPM_MAX_PROTECTED_ORDINAL) {
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duration_idx = tpm_protected_ordinal_duration[
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ordinal & TPM_PROTECTED_ORDINAL_MASK];
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}
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if (duration_idx != TPM_UNDEFINED)
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duration = chip->vendor.duration[duration_idx];
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if (duration <= 0)
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return 2 * 60 * HZ; /* Two minutes timeout */
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else
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return duration;
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}
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static ssize_t tpm_transmit(const unsigned char *buf, size_t bufsiz)
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{
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ssize_t rc;
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u32 count, ordinal;
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unsigned long start, stop;
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struct tpm_chip *chip = &g_chip;
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/* switch endianess: big->little */
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count = get_unaligned_be32(buf + TPM_CMD_COUNT_BYTE);
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ordinal = get_unaligned_be32(buf + TPM_CMD_ORDINAL_BYTE);
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if (count == 0) {
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error("no data\n");
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return -ENODATA;
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}
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if (count > bufsiz) {
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error("invalid count value %x %zx\n", count, bufsiz);
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return -E2BIG;
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}
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rc = chip->vendor.send(chip, (u8 *)buf, count);
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if (rc < 0) {
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error("tpm_transmit: tpm_send: error %zd\n", rc);
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goto out;
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}
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if (chip->vendor.irq)
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goto out_recv;
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start = get_timer(0);
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stop = tpm_calc_ordinal_duration(chip, ordinal);
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do {
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debug("waiting for status...\n");
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u8 status = chip->vendor.status(chip);
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if ((status & chip->vendor.req_complete_mask) ==
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chip->vendor.req_complete_val) {
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debug("...got it;\n");
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goto out_recv;
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}
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if (status == chip->vendor.req_canceled) {
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error("Operation Canceled\n");
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rc = -ECANCELED;
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goto out;
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}
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udelay(TPM_TIMEOUT * 1000);
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} while (get_timer(start) < stop);
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chip->vendor.cancel(chip);
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error("Operation Timed out\n");
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rc = -ETIME;
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goto out;
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out_recv:
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debug("out_recv: reading response...\n");
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rc = chip->vendor.recv(chip, (u8 *)buf, TPM_BUFSIZE);
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if (rc < 0)
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error("tpm_transmit: tpm_recv: error %zd\n", rc);
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out:
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return rc;
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}
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static int tpm_open(uint32_t dev_addr)
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{
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int rc;
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if (g_chip.is_open)
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return -EBUSY;
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rc = tpm_vendor_init(dev_addr);
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if (rc < 0)
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g_chip.is_open = 0;
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return rc;
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}
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static void tpm_close(void)
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{
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if (g_chip.is_open) {
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tpm_vendor_cleanup(&g_chip);
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g_chip.is_open = 0;
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}
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}
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static int tpm_select(void)
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{
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int ret;
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tpm.old_bus = i2c_get_bus_num();
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if (tpm.old_bus != tpm.i2c_bus) {
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ret = i2c_set_bus_num(tpm.i2c_bus);
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if (ret) {
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debug("%s: Fail to set i2c bus %d\n", __func__,
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tpm.i2c_bus);
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return -1;
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}
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}
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return 0;
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}
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static int tpm_deselect(void)
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{
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int ret;
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if (tpm.old_bus != i2c_get_bus_num()) {
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ret = i2c_set_bus_num(tpm.old_bus);
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if (ret) {
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debug("%s: Fail to restore i2c bus %d\n",
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__func__, tpm.old_bus);
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return -1;
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}
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}
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tpm.old_bus = -1;
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return 0;
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}
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/**
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* Decode TPM configuration.
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*
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* @param dev Returns a configuration of TPM device
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* @return 0 if ok, -1 on error
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*/
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static int tpm_decode_config(struct tpm *dev)
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{
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#ifdef CONFIG_OF_CONTROL
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const void *blob = gd->fdt_blob;
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int node, parent;
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int i2c_bus;
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node = fdtdec_next_compatible(blob, 0, COMPAT_INFINEON_SLB9635_TPM);
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if (node < 0) {
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node = fdtdec_next_compatible(blob, 0,
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COMPAT_INFINEON_SLB9645_TPM);
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}
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if (node < 0) {
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debug("%s: Node not found\n", __func__);
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return -1;
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}
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parent = fdt_parent_offset(blob, node);
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if (parent < 0) {
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debug("%s: Cannot find node parent\n", __func__);
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return -1;
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}
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i2c_bus = i2c_get_bus_num_fdt(parent);
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if (i2c_bus < 0)
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return -1;
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dev->i2c_bus = i2c_bus;
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dev->slave_addr = fdtdec_get_addr(blob, node, "reg");
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#else
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dev->i2c_bus = CONFIG_TPM_TIS_I2C_BUS_NUMBER;
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dev->slave_addr = CONFIG_TPM_TIS_I2C_SLAVE_ADDRESS;
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#endif
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return 0;
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}
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struct tpm_chip *tpm_register_hardware(const struct tpm_vendor_specific *entry)
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{
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struct tpm_chip *chip;
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/* Driver specific per-device data */
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chip = &g_chip;
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memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
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chip->is_open = 1;
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return chip;
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}
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int tis_init(void)
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{
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if (tpm.inited)
|
|
return 0;
|
|
|
|
if (tpm_decode_config(&tpm))
|
|
return -1;
|
|
|
|
if (tpm_select())
|
|
return -1;
|
|
|
|
/*
|
|
* Probe TPM twice; the first probing might fail because TPM is asleep,
|
|
* and the probing can wake up TPM.
|
|
*/
|
|
if (i2c_probe(tpm.slave_addr) && i2c_probe(tpm.slave_addr)) {
|
|
debug("%s: fail to probe i2c addr 0x%x\n", __func__,
|
|
tpm.slave_addr);
|
|
return -1;
|
|
}
|
|
|
|
tpm_deselect();
|
|
|
|
tpm.inited = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int tis_open(void)
|
|
{
|
|
int rc;
|
|
|
|
if (!tpm.inited)
|
|
return -1;
|
|
|
|
if (tpm_select())
|
|
return -1;
|
|
|
|
rc = tpm_open(tpm.slave_addr);
|
|
|
|
tpm_deselect();
|
|
|
|
return rc;
|
|
}
|
|
|
|
int tis_close(void)
|
|
{
|
|
if (!tpm.inited)
|
|
return -1;
|
|
|
|
if (tpm_select())
|
|
return -1;
|
|
|
|
tpm_close();
|
|
|
|
tpm_deselect();
|
|
|
|
return 0;
|
|
}
|
|
|
|
int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size,
|
|
uint8_t *recvbuf, size_t *rbuf_len)
|
|
{
|
|
int len;
|
|
uint8_t buf[4096];
|
|
|
|
if (!tpm.inited)
|
|
return -1;
|
|
|
|
if (sizeof(buf) < sbuf_size)
|
|
return -1;
|
|
|
|
memcpy(buf, sendbuf, sbuf_size);
|
|
|
|
if (tpm_select())
|
|
return -1;
|
|
|
|
len = tpm_transmit(buf, sbuf_size);
|
|
|
|
tpm_deselect();
|
|
|
|
if (len < 10) {
|
|
*rbuf_len = 0;
|
|
return -1;
|
|
}
|
|
|
|
memcpy(recvbuf, buf, len);
|
|
*rbuf_len = len;
|
|
|
|
return 0;
|
|
}
|