Add a driver for the I2C TPM from Infineon. Signed-off-by: Che-Liang Chiou <clchiou@chromium.org> Signed-off-by: Rong Chang <rongchang@chromium.org> Signed-off-by: Tom Wai-Hong Tam <waihong@chromium.org> Signed-off-by: Simon Glass <sjg@chromium.org>master
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/*
|
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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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* 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; either version 2 of |
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* the License, or (at your option) any later version. |
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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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#ifndef _COMPATIBILITY_H_ |
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#define _COMPATIBILITY_H_ |
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/* all includes from U-Boot */ |
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#include <linux/types.h> |
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#include <linux/unaligned/be_byteshift.h> |
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#include <asm-generic/errno.h> |
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#include <compiler.h> |
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#include <common.h> |
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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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#define msleep(t) udelay((t)*1000) |
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|
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/* Timer frequency. Corresponds to msec timer resolution*/ |
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#define HZ 1000 |
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#define dev_dbg(dev, format, arg...) debug(format, ##arg) |
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#define dev_err(dev, format, arg...) printf(format, ##arg) |
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#define dev_info(dev, format, arg...) debug(format, ##arg) |
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#define dbg_printf debug |
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#endif |
@ -0,0 +1,453 @@ |
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/*
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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 <malloc.h> |
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#include "tpm.h" |
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/* global structure for tpm chip data */ |
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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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#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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/*
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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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/*
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* Returns max number of milliseconds to wait |
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*/ |
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unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, 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 = |
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tpm_protected_ordinal_duration[ordinal & |
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TPM_PROTECTED_ORDINAL_MASK]; |
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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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#define TPM_CMD_COUNT_BYTE 2 |
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#define TPM_CMD_ORDINAL_BYTE 6 |
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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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dev_err(chip->dev, "no data\n"); |
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return -ENODATA; |
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} |
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if (count > bufsiz) { |
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dev_err(chip->dev, |
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"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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dev_err(chip->dev, "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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dbg_printf("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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dbg_printf("...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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dev_err(chip->dev, "Operation Canceled\n"); |
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rc = -ECANCELED; |
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goto out; |
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} |
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msleep(TPM_TIMEOUT); |
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} while (get_timer(start) < stop); |
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chip->vendor.cancel(chip); |
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dev_err(chip->dev, "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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dbg_printf("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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dev_err(chip->dev, "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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#define TPM_ERROR_SIZE 10 |
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enum tpm_capabilities { |
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TPM_CAP_PROP = cpu_to_be32(5), |
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}; |
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enum tpm_sub_capabilities { |
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TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115), |
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TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120), |
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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 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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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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} |
@ -0,0 +1,161 @@ |
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/*
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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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* |
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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 |
||||
* modify it under the terms of the GNU General Public License as |
||||
* 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 |
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
||||
* 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 |
||||
* along with this program; if not, write to the Free Software |
||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
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* MA 02111-1307 USA |
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*/ |
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|
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#ifndef _TPM_H_ |
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#define _TPM_H_ |
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|
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#include <linux/compiler.h> |
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|
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#include "compatibility.h" |
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|
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enum tpm_timeout { |
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TPM_TIMEOUT = 5, /* msecs */ |
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}; |
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|
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/* Size of external transmit buffer (used in tpm_transmit)*/ |
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#define TPM_BUFSIZE 4096 |
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|
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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 |
||||
|
||||
/* Index of Count field in TPM response buffer */ |
||||
#define TPM_RSP_SIZE_BYTE 2 |
||||
#define TPM_RSP_RC_BYTE 6 |
||||
|
||||
struct tpm_chip; |
||||
|
||||
struct tpm_vendor_specific { |
||||
const u8 req_complete_mask; |
||||
const u8 req_complete_val; |
||||
const u8 req_canceled; |
||||
int irq; |
||||
int (*recv) (struct tpm_chip *, u8 *, size_t); |
||||
int (*send) (struct tpm_chip *, u8 *, size_t); |
||||
void (*cancel) (struct tpm_chip *); |
||||
u8(*status) (struct tpm_chip *); |
||||
int locality; |
||||
unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* msec */ |
||||
unsigned long duration[3]; /* msec */ |
||||
}; |
||||
|
||||
struct tpm_chip { |
||||
int is_open; |
||||
struct tpm_vendor_specific vendor; |
||||
}; |
||||
|
||||
struct tpm_input_header { |
||||
__be16 tag; |
||||
__be32 length; |
||||
__be32 ordinal; |
||||
} __packed; |
||||
|
||||
struct tpm_output_header { |
||||
__be16 tag; |
||||
__be32 length; |
||||
__be32 return_code; |
||||
} __packed; |
||||
|
||||
struct timeout_t { |
||||
__be32 a; |
||||
__be32 b; |
||||
__be32 c; |
||||
__be32 d; |
||||
} __packed; |
||||
|
||||
struct duration_t { |
||||
__be32 tpm_short; |
||||
__be32 tpm_medium; |
||||
__be32 tpm_long; |
||||
} __packed; |
||||
|
||||
union cap_t { |
||||
struct timeout_t timeout; |
||||
struct duration_t duration; |
||||
}; |
||||
|
||||
struct tpm_getcap_params_in { |
||||
__be32 cap; |
||||
__be32 subcap_size; |
||||
__be32 subcap; |
||||
} __packed; |
||||
|
||||
struct tpm_getcap_params_out { |
||||
__be32 cap_size; |
||||
union cap_t cap; |
||||
} __packed; |
||||
|
||||
union tpm_cmd_header { |
||||
struct tpm_input_header in; |
||||
struct tpm_output_header out; |
||||
}; |
||||
|
||||
union tpm_cmd_params { |
||||
struct tpm_getcap_params_out getcap_out; |
||||
struct tpm_getcap_params_in getcap_in; |
||||
}; |
||||
|
||||
struct tpm_cmd_t { |
||||
union tpm_cmd_header header; |
||||
union tpm_cmd_params params; |
||||
} __packed; |
||||
|
||||
|
||||
/* ---------- Interface for TPM vendor ------------ */ |
||||
|
||||
extern struct tpm_chip *tpm_register_hardware( |
||||
const struct tpm_vendor_specific *); |
||||
|
||||
extern int tpm_vendor_init(uint32_t dev_addr); |
||||
|
||||
extern void tpm_vendor_cleanup(struct tpm_chip *chip); |
||||
|
||||
/* ---------- Interface for TDDL ------------------- */ |
||||
|
||||
/*
|
||||
* if dev_addr != 0 - redefines TPM device address |
||||
* Returns < 0 on error, 0 on success. |
||||
*/ |
||||
extern int tpm_open(uint32_t dev_addr); |
||||
|
||||
extern void tpm_close(void); |
||||
|
||||
/*
|
||||
* Transmit bufsiz bytes out of buf to TPM and get results back in buf, too. |
||||
* Returns < 0 on error, 0 on success. |
||||
*/ |
||||
extern ssize_t tpm_transmit(const unsigned char *buf, size_t bufsiz); |
||||
|
||||
#endif |
@ -0,0 +1,561 @@ |
||||
/*
|
||||
* Copyright (C) 2011 Infineon Technologies |
||||
* |
||||
* Authors: |
||||
* Peter Huewe <huewe.external@infineon.com> |
||||
* |
||||
* Description: |
||||
* Device driver for TCG/TCPA TPM (trusted platform module). |
||||
* Specifications at www.trustedcomputinggroup.org |
||||
* |
||||
* This device driver implements the TPM interface as defined in |
||||
* the TCG TPM Interface Spec version 1.2, revision 1.0 and the |
||||
* Infineon I2C Protocol Stack Specification v0.20. |
||||
* |
||||
* It is based on the Linux kernel driver tpm.c from Leendert van |
||||
* Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall. |
||||
* |
||||
* Version: 2.1.1 |
||||
* |
||||
* See file CREDITS for list of people who contributed to this |
||||
* project. |
||||
* |
||||
* 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. |
||||
* |
||||
* You should have received a copy of the GNU General Public License |
||||
* along with this program; if not, write to the Free Software |
||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
||||
* MA 02111-1307 USA |
||||
*/ |
||||
|
||||
#include <common.h> |
||||
#include <i2c.h> |
||||
#include <linux/types.h> |
||||
|
||||
#include "compatibility.h" |
||||
#include "tpm.h" |
||||
|
||||
/* max. buffer size supported by our tpm */ |
||||
#ifdef TPM_BUFSIZE |
||||
#undef TPM_BUFSIZE |
||||
#endif |
||||
#define TPM_BUFSIZE 1260 |
||||
/* Address of the TPM on the I2C bus */ |
||||
#define TPM_I2C_ADDR 0x20 |
||||
/* max. number of iterations after i2c NAK */ |
||||
#define MAX_COUNT 3 |
||||
|
||||
#define SLEEP_DURATION 60 /*in usec*/ |
||||
|
||||
/* max. number of iterations after i2c NAK for 'long' commands
|
||||
* we need this especially for sending TPM_READY, since the cleanup after the |
||||
* transtion to the ready state may take some time, but it is unpredictable |
||||
* how long it will take. |
||||
*/ |
||||
#define MAX_COUNT_LONG 50 |
||||
|
||||
#define SLEEP_DURATION_LONG 210 /* in usec */ |
||||
|
||||
/* expected value for DIDVID register */ |
||||
#define TPM_TIS_I2C_DID_VID 0x000b15d1L |
||||
|
||||
/* Structure to store I2C TPM specific stuff */ |
||||
struct tpm_inf_dev { |
||||
uint addr; |
||||
u8 buf[TPM_BUFSIZE + sizeof(u8)]; /* max. buffer size + addr */ |
||||
}; |
||||
|
||||
static struct tpm_inf_dev tpm_dev = { |
||||
.addr = TPM_I2C_ADDR |
||||
}; |
||||
|
||||
/*
|
||||
* iic_tpm_read() - read from TPM register |
||||
* @addr: register address to read from |
||||
* @buffer: provided by caller |
||||
* @len: number of bytes to read |
||||
* |
||||
* Read len bytes from TPM register and put them into |
||||
* buffer (little-endian format, i.e. first byte is put into buffer[0]). |
||||
* |
||||
* NOTE: TPM is big-endian for multi-byte values. Multi-byte |
||||
* values have to be swapped. |
||||
* |
||||
* Return -EIO on error, 0 on success. |
||||
*/ |
||||
int iic_tpm_read(u8 addr, u8 *buffer, size_t len) |
||||
{ |
||||
int rc; |
||||
int count; |
||||
uint myaddr = addr; |
||||
/* we have to use uint here, uchar hangs the board */ |
||||
|
||||
for (count = 0; count < MAX_COUNT; count++) { |
||||
rc = i2c_write(tpm_dev.addr, 0, 0, (uchar *)&myaddr, 1); |
||||
if (rc == 0) |
||||
break; /*success, break to skip sleep*/ |
||||
|
||||
udelay(SLEEP_DURATION); |
||||
} |
||||
|
||||
if (rc) |
||||
return -rc; |
||||
|
||||
/* After the TPM has successfully received the register address it needs
|
||||
* some time, thus we're sleeping here again, before retrieving the data |
||||
*/ |
||||
for (count = 0; count < MAX_COUNT; count++) { |
||||
udelay(SLEEP_DURATION); |
||||
rc = i2c_read(tpm_dev.addr, 0, 0, buffer, len); |
||||
if (rc == 0) |
||||
break; /*success, break to skip sleep*/ |
||||
} |
||||
|
||||
if (rc) |
||||
return -rc; |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static int iic_tpm_write_generic(u8 addr, u8 *buffer, size_t len, |
||||
unsigned int sleep_time, |
||||
u8 max_count) |
||||
{ |
||||
int rc = 0; |
||||
int count; |
||||
|
||||
/* prepare send buffer */ |
||||
tpm_dev.buf[0] = addr; |
||||
memcpy(&(tpm_dev.buf[1]), buffer, len); |
||||
|
||||
for (count = 0; count < max_count; count++) { |
||||
rc = i2c_write(tpm_dev.addr, 0, 0, tpm_dev.buf, len + 1); |
||||
if (rc == 0) |
||||
break; /*success, break to skip sleep*/ |
||||
|
||||
udelay(sleep_time); |
||||
} |
||||
|
||||
if (rc) |
||||
return -rc; |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
/*
|
||||
* iic_tpm_write() - write to TPM register |
||||
* @addr: register address to write to |
||||
* @buffer: containing data to be written |
||||
* @len: number of bytes to write |
||||
* |
||||
* Write len bytes from provided buffer to TPM register (little |
||||
* endian format, i.e. buffer[0] is written as first byte). |
||||
* |
||||
* NOTE: TPM is big-endian for multi-byte values. Multi-byte |
||||
* values have to be swapped. |
||||
* |
||||
* NOTE: use this function instead of the iic_tpm_write_generic function. |
||||
* |
||||
* Return -EIO on error, 0 on success |
||||
*/ |
||||
static int iic_tpm_write(u8 addr, u8 *buffer, size_t len) |
||||
{ |
||||
return iic_tpm_write_generic(addr, buffer, len, SLEEP_DURATION, |
||||
MAX_COUNT); |
||||
} |
||||
|
||||
/*
|
||||
* This function is needed especially for the cleanup situation after |
||||
* sending TPM_READY |
||||
* */ |
||||
static int iic_tpm_write_long(u8 addr, u8 *buffer, size_t len) |
||||
{ |
||||
return iic_tpm_write_generic(addr, buffer, len, SLEEP_DURATION_LONG, |
||||
MAX_COUNT_LONG); |
||||
} |
||||
|
||||
#define TPM_HEADER_SIZE 10 |
||||
|
||||
enum tis_access { |
||||
TPM_ACCESS_VALID = 0x80, |
||||
TPM_ACCESS_ACTIVE_LOCALITY = 0x20, |
||||
TPM_ACCESS_REQUEST_PENDING = 0x04, |
||||
TPM_ACCESS_REQUEST_USE = 0x02, |
||||
}; |
||||
|
||||
enum tis_status { |
||||
TPM_STS_VALID = 0x80, |
||||
TPM_STS_COMMAND_READY = 0x40, |
||||
TPM_STS_GO = 0x20, |
||||
TPM_STS_DATA_AVAIL = 0x10, |
||||
TPM_STS_DATA_EXPECT = 0x08, |
||||
}; |
||||
|
||||
enum tis_defaults { |
||||
TIS_SHORT_TIMEOUT = 750, /* ms */ |
||||
TIS_LONG_TIMEOUT = 2000, /* 2 sec */ |
||||
}; |
||||
|
||||
#define TPM_ACCESS(l) (0x0000 | ((l) << 4)) |
||||
#define TPM_STS(l) (0x0001 | ((l) << 4)) |
||||
#define TPM_DATA_FIFO(l) (0x0005 | ((l) << 4)) |
||||
#define TPM_DID_VID(l) (0x0006 | ((l) << 4)) |
||||
|
||||
static int check_locality(struct tpm_chip *chip, int loc) |
||||
{ |
||||
u8 buf; |
||||
int rc; |
||||
|
||||
rc = iic_tpm_read(TPM_ACCESS(loc), &buf, 1); |
||||
if (rc < 0) |
||||
return rc; |
||||
|
||||
if ((buf & (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) == |
||||
(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) { |
||||
chip->vendor.locality = loc; |
||||
return loc; |
||||
} |
||||
|
||||
return -1; |
||||
} |
||||
|
||||
static void release_locality(struct tpm_chip *chip, int loc, int force) |
||||
{ |
||||
u8 buf; |
||||
if (iic_tpm_read(TPM_ACCESS(loc), &buf, 1) < 0) |
||||
return; |
||||
|
||||
if (force || (buf & (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) == |
||||
(TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) { |
||||
buf = TPM_ACCESS_ACTIVE_LOCALITY; |
||||
iic_tpm_write(TPM_ACCESS(loc), &buf, 1); |
||||
} |
||||
} |
||||
|
||||
static int request_locality(struct tpm_chip *chip, int loc) |
||||
{ |
||||
unsigned long start, stop; |
||||
u8 buf = TPM_ACCESS_REQUEST_USE; |
||||
|
||||
if (check_locality(chip, loc) >= 0) |
||||
return loc; /* we already have the locality */ |
||||
|
||||
iic_tpm_write(TPM_ACCESS(loc), &buf, 1); |
||||
|
||||
/* wait for burstcount */ |
||||
start = get_timer(0); |
||||
stop = chip->vendor.timeout_a; |
||||
do { |
||||
if (check_locality(chip, loc) >= 0) |
||||
return loc; |
||||
msleep(TPM_TIMEOUT); |
||||
} while (get_timer(start) < stop); |
||||
|
||||
return -1; |
||||
} |
||||
|
||||
static u8 tpm_tis_i2c_status(struct tpm_chip *chip) |
||||
{ |
||||
/* NOTE: since i2c read may fail, return 0 in this case --> time-out */ |
||||
u8 buf; |
||||
if (iic_tpm_read(TPM_STS(chip->vendor.locality), &buf, 1) < 0) |
||||
return 0; |
||||
else |
||||
return buf; |
||||
} |
||||
|
||||
static void tpm_tis_i2c_ready(struct tpm_chip *chip) |
||||
{ |
||||
/* this causes the current command to be aborted */ |
||||
u8 buf = TPM_STS_COMMAND_READY; |
||||
iic_tpm_write_long(TPM_STS(chip->vendor.locality), &buf, 1); |
||||
} |
||||
|
||||
static ssize_t get_burstcount(struct tpm_chip *chip) |
||||
{ |
||||
unsigned long start, stop; |
||||
ssize_t burstcnt; |
||||
u8 buf[3]; |
||||
|
||||
/* wait for burstcount */ |
||||
/* which timeout value, spec has 2 answers (c & d) */ |
||||
start = get_timer(0); |
||||
stop = chip->vendor.timeout_d; |
||||
do { |
||||
/* Note: STS is little endian */ |
||||
if (iic_tpm_read(TPM_STS(chip->vendor.locality) + 1, buf, 3) |
||||
< 0) |
||||
burstcnt = 0; |
||||
else |
||||
burstcnt = (buf[2] << 16) + (buf[1] << 8) + buf[0]; |
||||
|
||||
if (burstcnt) |
||||
return burstcnt; |
||||
msleep(TPM_TIMEOUT); |
||||
} while (get_timer(start) < stop); |
||||
|
||||
return -EBUSY; |
||||
} |
||||
|
||||
static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout, |
||||
int *status) |
||||
{ |
||||
unsigned long start, stop; |
||||
|
||||
/* check current status */ |
||||
*status = tpm_tis_i2c_status(chip); |
||||
if ((*status & mask) == mask) |
||||
return 0; |
||||
|
||||
start = get_timer(0); |
||||
stop = timeout; |
||||
do { |
||||
msleep(TPM_TIMEOUT); |
||||
*status = tpm_tis_i2c_status(chip); |
||||
if ((*status & mask) == mask) |
||||
return 0; |
||||
|
||||
} while (get_timer(start) < stop); |
||||
|
||||
return -ETIME; |
||||
} |
||||
|
||||
static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count) |
||||
{ |
||||
size_t size = 0; |
||||
ssize_t burstcnt; |
||||
int rc; |
||||
|
||||
while (size < count) { |
||||
burstcnt = get_burstcount(chip); |
||||
|
||||
/* burstcount < 0 = tpm is busy */ |
||||
if (burstcnt < 0) |
||||
return burstcnt; |
||||
|
||||
/* limit received data to max. left */ |
||||
if (burstcnt > (count - size)) |
||||
burstcnt = count - size; |
||||
|
||||
rc = iic_tpm_read(TPM_DATA_FIFO(chip->vendor.locality), |
||||
&(buf[size]), |
||||
burstcnt); |
||||
if (rc == 0) |
||||
size += burstcnt; |
||||
} |
||||
|
||||
return size; |
||||
} |
||||
|
||||
static int tpm_tis_i2c_recv(struct tpm_chip *chip, u8 *buf, size_t count) |
||||
{ |
||||
int size = 0; |
||||
int expected, status; |
||||
|
||||
if (count < TPM_HEADER_SIZE) { |
||||
size = -EIO; |
||||
goto out; |
||||
} |
||||
|
||||
/* read first 10 bytes, including tag, paramsize, and result */ |
||||
size = recv_data(chip, buf, TPM_HEADER_SIZE); |
||||
if (size < TPM_HEADER_SIZE) { |
||||
dev_err(chip->dev, "Unable to read header\n"); |
||||
goto out; |
||||
} |
||||
|
||||
expected = get_unaligned_be32(buf + TPM_RSP_SIZE_BYTE); |
||||
if ((size_t)expected > count) { |
||||
size = -EIO; |
||||
goto out; |
||||
} |
||||
|
||||
size += recv_data(chip, &buf[TPM_HEADER_SIZE], |
||||
expected - TPM_HEADER_SIZE); |
||||
if (size < expected) { |
||||
dev_err(chip->dev, "Unable to read remainder of result\n"); |
||||
size = -ETIME; |
||||
goto out; |
||||
} |
||||
|
||||
wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c, &status); |
||||
if (status & TPM_STS_DATA_AVAIL) { /* retry? */ |
||||
dev_err(chip->dev, "Error left over data\n"); |
||||
size = -EIO; |
||||
goto out; |
||||
} |
||||
|
||||
out: |
||||
tpm_tis_i2c_ready(chip); |
||||
/* The TPM needs some time to clean up here,
|
||||
* so we sleep rather than keeping the bus busy |
||||
*/ |
||||
udelay(2000); |
||||
release_locality(chip, chip->vendor.locality, 0); |
||||
|
||||
return size; |
||||
} |
||||
|
||||
static int tpm_tis_i2c_send(struct tpm_chip *chip, u8 *buf, size_t len) |
||||
{ |
||||
int rc, status; |
||||
ssize_t burstcnt; |
||||
size_t count = 0; |
||||
u8 sts = TPM_STS_GO; |
||||
|
||||
if (len > TPM_BUFSIZE) |
||||
return -E2BIG; /* command is too long for our tpm, sorry */ |
||||
|
||||
if (request_locality(chip, 0) < 0) |
||||
return -EBUSY; |
||||
|
||||
status = tpm_tis_i2c_status(chip); |
||||
if ((status & TPM_STS_COMMAND_READY) == 0) { |
||||
tpm_tis_i2c_ready(chip); |
||||
if (wait_for_stat |
||||
(chip, TPM_STS_COMMAND_READY, |
||||
chip->vendor.timeout_b, &status) < 0) { |
||||
rc = -ETIME; |
||||
goto out_err; |
||||
} |
||||
} |
||||
|
||||
while (count < len - 1) { |
||||
burstcnt = get_burstcount(chip); |
||||
|
||||
/* burstcount < 0 = tpm is busy */ |
||||
if (burstcnt < 0) |
||||
return burstcnt; |
||||
|
||||
if (burstcnt > (len-1-count)) |
||||
burstcnt = len-1-count; |
||||
|
||||
#ifdef CONFIG_TPM_I2C_BURST_LIMITATION |
||||
if (burstcnt > CONFIG_TPM_I2C_BURST_LIMITATION) |
||||
burstcnt = CONFIG_TPM_I2C_BURST_LIMITATION; |
||||
#endif /* CONFIG_TPM_I2C_BURST_LIMITATION */ |
||||
|
||||
rc = iic_tpm_write(TPM_DATA_FIFO(chip->vendor.locality), |
||||
&(buf[count]), burstcnt); |
||||
if (rc == 0) |
||||
count += burstcnt; |
||||
|
||||
wait_for_stat(chip, TPM_STS_VALID, |
||||
chip->vendor.timeout_c, &status); |
||||
|
||||
if ((status & TPM_STS_DATA_EXPECT) == 0) { |
||||
rc = -EIO; |
||||
goto out_err; |
||||
} |
||||
} |
||||
|
||||
/* write last byte */ |
||||
iic_tpm_write(TPM_DATA_FIFO(chip->vendor.locality), &(buf[count]), 1); |
||||
wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c, &status); |
||||
if ((status & TPM_STS_DATA_EXPECT) != 0) { |
||||
rc = -EIO; |
||||
goto out_err; |
||||
} |
||||
|
||||
/* go and do it */ |
||||
iic_tpm_write(TPM_STS(chip->vendor.locality), &sts, 1); |
||||
|
||||
return len; |
||||
out_err: |
||||
tpm_tis_i2c_ready(chip); |
||||
/* The TPM needs some time to clean up here,
|
||||
* so we sleep rather than keeping the bus busy |
||||
*/ |
||||
udelay(2000); |
||||
release_locality(chip, chip->vendor.locality, 0); |
||||
|
||||
return rc; |
||||
} |
||||
|
||||
static struct tpm_vendor_specific tpm_tis_i2c = { |
||||
.status = tpm_tis_i2c_status, |
||||
.recv = tpm_tis_i2c_recv, |
||||
.send = tpm_tis_i2c_send, |
||||
.cancel = tpm_tis_i2c_ready, |
||||
.req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID, |
||||
.req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID, |
||||
.req_canceled = TPM_STS_COMMAND_READY, |
||||
}; |
||||
|
||||
/* initialisation of i2c tpm */ |
||||
|
||||
|
||||
int tpm_vendor_init(uint32_t dev_addr) |
||||
{ |
||||
u32 vendor; |
||||
uint old_addr; |
||||
int rc = 0; |
||||
struct tpm_chip *chip; |
||||
|
||||
old_addr = tpm_dev.addr; |
||||
if (dev_addr != 0) |
||||
tpm_dev.addr = dev_addr; |
||||
|
||||
chip = tpm_register_hardware(&tpm_tis_i2c); |
||||
if (chip < 0) { |
||||
rc = -ENODEV; |
||||
goto out_err; |
||||
} |
||||
|
||||
/* Disable interrupts (not supported) */ |
||||
chip->vendor.irq = 0; |
||||
|
||||
/* Default timeouts */ |
||||
chip->vendor.timeout_a = TIS_SHORT_TIMEOUT; |
||||
chip->vendor.timeout_b = TIS_LONG_TIMEOUT; |
||||
chip->vendor.timeout_c = TIS_SHORT_TIMEOUT; |
||||
chip->vendor.timeout_d = TIS_SHORT_TIMEOUT; |
||||
|
||||
if (request_locality(chip, 0) != 0) { |
||||
rc = -ENODEV; |
||||
goto out_err; |
||||
} |
||||
|
||||
/* read four bytes from DID_VID register */ |
||||
if (iic_tpm_read(TPM_DID_VID(0), (uchar *)&vendor, 4) < 0) { |
||||
rc = -EIO; |
||||
goto out_release; |
||||
} |
||||
|
||||
/* create DID_VID register value, after swapping to little-endian */ |
||||
vendor = be32_to_cpu(vendor); |
||||
|
||||
if (vendor != TPM_TIS_I2C_DID_VID) { |
||||
rc = -ENODEV; |
||||
goto out_release; |
||||
} |
||||
|
||||
dev_info(dev, "1.2 TPM (device-id 0x%X)\n", vendor >> 16); |
||||
|
||||
/*
|
||||
* A timeout query to TPM can be placed here. |
||||
* Standard timeout values are used so far |
||||
*/ |
||||
|
||||
return 0; |
||||
|
||||
out_release: |
||||
release_locality(chip, 0, 1); |
||||
|
||||
out_err: |
||||
tpm_dev.addr = old_addr; |
||||
return rc; |
||||
} |
||||
|
||||
void tpm_vendor_cleanup(struct tpm_chip *chip) |
||||
{ |
||||
release_locality(chip, chip->vendor.locality, 1); |
||||
} |
@ -0,0 +1,181 @@ |
||||
/*
|
||||
* Copyright (c) 2012 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. |
||||
*/ |
||||
|
||||
#include <config.h> |
||||
#include <common.h> |
||||
#include <fdtdec.h> |
||||
#include <i2c.h> |
||||
#include "slb9635_i2c/tpm.h" |
||||
|
||||
DECLARE_GLOBAL_DATA_PTR; |
||||
|
||||
/* TPM configuration */ |
||||
struct tpm { |
||||
int i2c_bus; |
||||
int slave_addr; |
||||
char inited; |
||||
int old_bus; |
||||
} tpm; |
||||
|
||||
|
||||
static int tpm_select(void) |
||||
{ |
||||
int ret; |
||||
|
||||
tpm.old_bus = i2c_get_bus_num(); |
||||
if (tpm.old_bus != tpm.i2c_bus) { |
||||
ret = i2c_set_bus_num(tpm.i2c_bus); |
||||
if (ret) { |
||||
debug("%s: Fail to set i2c bus %d\n", __func__, |
||||
tpm.i2c_bus); |
||||
return -1; |
||||
} |
||||
} |
||||
return 0; |
||||
} |
||||
|
||||
static int tpm_deselect(void) |
||||
{ |
||||
int ret; |
||||
|
||||
if (tpm.old_bus != i2c_get_bus_num()) { |
||||
ret = i2c_set_bus_num(tpm.old_bus); |
||||
if (ret) { |
||||
debug("%s: Fail to restore i2c bus %d\n", |
||||
__func__, tpm.old_bus); |
||||
return -1; |
||||
} |
||||
} |
||||
tpm.old_bus = -1; |
||||
return 0; |
||||
} |
||||
|
||||
/**
|
||||
* Decode TPM configuration. |
||||
* |
||||
* @param dev Returns a configuration of TPM device |
||||
* @return 0 if ok, -1 on error |
||||
*/ |
||||
static int tpm_decode_config(struct tpm *dev) |
||||
{ |
||||
#ifdef CONFIG_OF_CONTROL |
||||
const void *blob = gd->fdt_blob; |
||||
int node, parent; |
||||
int i2c_bus; |
||||
|
||||
node = fdtdec_next_compatible(blob, 0, COMPAT_INFINEON_SLB9635_TPM); |
||||
if (node < 0) { |
||||
debug("%s: Node not found\n", __func__); |
||||
return -1; |
||||
} |
||||
parent = fdt_parent_offset(blob, node); |
||||
if (parent < 0) { |
||||
debug("%s: Cannot find node parent\n", __func__); |
||||
return -1; |
||||
} |
||||
i2c_bus = i2c_get_bus_num_fdt(parent); |
||||
if (i2c_bus < 0) |
||||
return -1; |
||||
dev->i2c_bus = i2c_bus; |
||||
dev->slave_addr = fdtdec_get_addr(blob, node, "reg"); |
||||
#else |
||||
dev->i2c_bus = CONFIG_INFINEON_TPM_I2C_BUS; |
||||
dev->slave_addr = CONFIG_INFINEON_TPM_I2C_ADDR; |
||||
#endif |
||||
return 0; |
||||
} |
||||
|
||||
int tis_init(void) |
||||
{ |
||||
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; |
||||
} |
Loading…
Reference in new issue