blob: 361a7720fa547816c04818ccc0640188384cd759 [file] [log] [blame]
Dirk Eibachc01939c2013-06-26 15:55:15 +02001/*
2 * This program is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU General Public License as
4 * published by the Free Software Foundation; either version 2 of
5 * the License, or (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
15 * MA 02111-1307 USA
16 */
17
18#include <common.h>
19#include <tpm.h>
20#include <i2c.h>
21#include <asm/unaligned.h>
22
23#define ATMEL_TPM_TIMEOUT_MS 5000 /* sufficient for anything but
24 generating/exporting keys */
25
26/*
27 * tis_init()
28 *
29 * Initialize the TPM device. Returns 0 on success or -1 on
30 * failure (in case device probing did not succeed).
31 */
32int tis_init(void)
33{
34 return 0;
35}
36
37/*
38 * tis_open()
39 *
40 * Requests access to locality 0 for the caller. After all commands have been
41 * completed the caller is supposed to call tis_close().
42 *
43 * Returns 0 on success, -1 on failure.
44 */
45int tis_open(void)
46{
47 return 0;
48}
49
50/*
51 * tis_close()
52 *
53 * terminate the currect session with the TPM by releasing the locked
54 * locality. Returns 0 on success of -1 on failure (in case lock
55 * removal did not succeed).
56 */
57int tis_close(void)
58{
59 return 0;
60}
61
62/*
63 * tis_sendrecv()
64 *
65 * Send the requested data to the TPM and then try to get its response
66 *
67 * @sendbuf - buffer of the data to send
68 * @send_size size of the data to send
69 * @recvbuf - memory to save the response to
70 * @recv_len - pointer to the size of the response buffer
71 *
72 * Returns 0 on success (and places the number of response bytes at recv_len)
73 * or -1 on failure.
74 */
75int tis_sendrecv(const uint8_t *sendbuf, size_t send_size, uint8_t *recvbuf,
76 size_t *recv_len)
77{
78 int res;
79 unsigned long start;
80
81#ifdef DEBUG
82 memset(recvbuf, 0xcc, *recv_len);
83 printf("send to TPM (%d bytes, recv_len=%d):\n", send_size, *recv_len);
84 print_buffer(0, (void *)sendbuf, 1, send_size, 0);
85#endif
86
87 res = i2c_write(0x29, 0, 0, (uchar *)sendbuf, send_size);
88 if (res) {
89 printf("i2c_write returned %d\n", res);
90 return -1;
91 }
92
93 start = get_timer(0);
94 while ((res = i2c_read(0x29, 0, 0, recvbuf, 10))) {
95 if (get_timer(start) > ATMEL_TPM_TIMEOUT_MS) {
96 puts("tpm timed out\n");
97 return -1;
98 }
99 udelay(100);
100 }
101 if (!res) {
102 *recv_len = get_unaligned_be32(recvbuf + 2);
103 if (*recv_len > 10)
104 res = i2c_read(0x29, 0, 0, recvbuf, *recv_len);
105 }
106 if (res) {
107 printf("i2c_read returned %d (rlen=%d)\n", res, *recv_len);
108#ifdef DEBUG
109 print_buffer(0, recvbuf, 1, *recv_len, 0);
110#endif
111 }
112
113#ifdef DEBUG
114 if (!res) {
115 printf("read from TPM (%d bytes):\n", *recv_len);
116 print_buffer(0, recvbuf, 1, *recv_len, 0);
117 }
118#endif
119
120 return res;
121}