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1 | /* |
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 | */ | |
32 | int 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 | */ | |
45 | int 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 | */ | |
57 | int 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 | */ | |
75 | int 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 | } |