122 lines
2.9 KiB
C
122 lines
2.9 KiB
C
/*
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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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