Add support for Atmel TPM devices with two wire interface. Signed-off-by: Dirk Eibach <dirk.eibach@gdsys.cc> Signed-off-by: Reinhard Pfau <reinhard.pfau@gdsys.cc> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Andy Fleming <afleming@freescale.com>master
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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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#include <common.h> |
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#include <tpm.h> |
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#include <i2c.h> |
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#include <asm/unaligned.h> |
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#define ATMEL_TPM_TIMEOUT_MS 5000 /* sufficient for anything but |
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generating/exporting keys */ |
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/*
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* tis_init() |
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* |
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* Initialize the TPM device. Returns 0 on success or -1 on |
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* failure (in case device probing did not succeed). |
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*/ |
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int tis_init(void) |
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{ |
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return 0; |
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} |
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/*
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* tis_open() |
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* |
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* Requests access to locality 0 for the caller. After all commands have been |
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* completed the caller is supposed to call tis_close(). |
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* |
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* Returns 0 on success, -1 on failure. |
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*/ |
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int tis_open(void) |
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{ |
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return 0; |
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} |
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/*
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* tis_close() |
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* |
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* terminate the currect session with the TPM by releasing the locked |
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* locality. Returns 0 on success of -1 on failure (in case lock |
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* removal did not succeed). |
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*/ |
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int tis_close(void) |
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{ |
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return 0; |
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} |
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/*
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* tis_sendrecv() |
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* |
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* Send the requested data to the TPM and then try to get its response |
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* |
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* @sendbuf - buffer of the data to send |
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* @send_size size of the data to send |
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* @recvbuf - memory to save the response to |
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* @recv_len - pointer to the size of the response buffer |
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* |
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* Returns 0 on success (and places the number of response bytes at recv_len) |
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* or -1 on failure. |
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*/ |
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int tis_sendrecv(const uint8_t *sendbuf, size_t send_size, uint8_t *recvbuf, |
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size_t *recv_len) |
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{ |
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int res; |
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unsigned long start; |
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#ifdef DEBUG |
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memset(recvbuf, 0xcc, *recv_len); |
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printf("send to TPM (%d bytes, recv_len=%d):\n", send_size, *recv_len); |
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print_buffer(0, (void *)sendbuf, 1, send_size, 0); |
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#endif |
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res = i2c_write(0x29, 0, 0, (uchar *)sendbuf, send_size); |
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if (res) { |
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printf("i2c_write returned %d\n", res); |
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return -1; |
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} |
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start = get_timer(0); |
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while ((res = i2c_read(0x29, 0, 0, recvbuf, 10))) { |
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if (get_timer(start) > ATMEL_TPM_TIMEOUT_MS) { |
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puts("tpm timed out\n"); |
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return -1; |
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} |
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udelay(100); |
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} |
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if (!res) { |
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*recv_len = get_unaligned_be32(recvbuf + 2); |
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if (*recv_len > 10) |
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res = i2c_read(0x29, 0, 0, recvbuf, *recv_len); |
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} |
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if (res) { |
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printf("i2c_read returned %d (rlen=%d)\n", res, *recv_len); |
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#ifdef DEBUG |
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print_buffer(0, recvbuf, 1, *recv_len, 0); |
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#endif |
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} |
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#ifdef DEBUG |
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if (!res) { |
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printf("read from TPM (%d bytes):\n", *recv_len); |
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print_buffer(0, recvbuf, 1, *recv_len, 0); |
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} |
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#endif |
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return res; |
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} |
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