1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
/*
* This file is part of the coreboot 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; either version 2 of
* the License, or (at your option) any later version.
*
* 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.
*/
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <commonlib/endian.h>
#include <console/console.h>
#include <delay.h>
#include <device/i2c_simple.h>
#include <endian.h>
#include <lib.h>
#include <security/tpm/tis.h>
#include "tpm.h"
/* global structure for tpm chip data */
static struct tpm_chip chip;
#define TPM_CMD_COUNT_BYTE 2
#define TPM_CMD_ORDINAL_BYTE 6
int tis_open(void)
{
int rc;
if (chip.is_open) {
printk(BIOS_DEBUG, "tis_open() called twice.\n");
return -1;
}
rc = tpm_vendor_init(&chip, CONFIG_DRIVER_TPM_I2C_BUS,
CONFIG_DRIVER_TPM_I2C_ADDR);
if (rc < 0)
chip.is_open = 0;
if (rc)
return -1;
return 0;
}
int tis_close(void)
{
if (chip.is_open) {
tpm_vendor_cleanup(&chip);
chip.is_open = 0;
}
return 0;
}
int tis_init(void)
{
return tpm_vendor_probe(CONFIG_DRIVER_TPM_I2C_BUS,
CONFIG_DRIVER_TPM_I2C_ADDR);
}
static ssize_t tpm_transmit(const uint8_t *sbuf, size_t sbufsiz, void *rbuf,
size_t rbufsiz)
{
int rc;
uint32_t count;
memcpy(&count, sbuf + TPM_CMD_COUNT_BYTE, sizeof(count));
count = be32_to_cpu(count);
if (!chip.vendor.send || !chip.vendor.status || !chip.vendor.cancel)
return -1;
if (count == 0) {
printk(BIOS_DEBUG, "tpm_transmit: no data\n");
return -1;
}
if (count > sbufsiz) {
printk(BIOS_DEBUG, "tpm_transmit: invalid count value %x %zx\n",
count, sbufsiz);
return -1;
}
ASSERT(chip.vendor.send);
rc = chip.vendor.send(&chip, (uint8_t *) sbuf, count);
if (rc < 0) {
printk(BIOS_DEBUG, "tpm_transmit: tpm_send error\n");
goto out;
}
int timeout = 2 * 60 * 1000; /* two minutes timeout */
while (timeout) {
ASSERT(chip.vendor.status);
uint8_t status = chip.vendor.status(&chip);
if ((status & chip.vendor.req_complete_mask) ==
chip.vendor.req_complete_val) {
goto out_recv;
}
if (status == chip.vendor.req_canceled) {
printk(BIOS_DEBUG,
"tpm_transmit: Operation Canceled\n");
rc = -1;
goto out;
}
mdelay(TPM_TIMEOUT);
timeout--;
}
ASSERT(chip.vendor.cancel);
chip.vendor.cancel(&chip);
printk(BIOS_DEBUG, "tpm_transmit: Operation Timed out\n");
rc = -1; //ETIME;
goto out;
out_recv:
rc = chip.vendor.recv(&chip, (uint8_t *) rbuf, rbufsiz);
if (rc < 0)
printk(BIOS_DEBUG, "tpm_transmit: tpm_recv: error %d\n", rc);
out:
return rc;
}
int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size,
uint8_t *recvbuf, size_t *rbuf_len)
{
ASSERT(sbuf_size >= 10);
/* Display the TPM command */
if (CONFIG(DRIVER_TPM_DISPLAY_TIS_BYTES)) {
printk(BIOS_DEBUG, "TPM Command: 0x%08x\n",
read_at_be32(sendbuf, sizeof(uint16_t)
+ sizeof(uint32_t)));
hexdump(sendbuf, sbuf_size);
}
int len = tpm_transmit(sendbuf, sbuf_size, recvbuf, *rbuf_len);
if (len < 10) {
*rbuf_len = 0;
return -1;
}
if (len > *rbuf_len) {
*rbuf_len = len;
return -1;
}
*rbuf_len = len;
/* Display the TPM response */
if (CONFIG(DRIVER_TPM_DISPLAY_TIS_BYTES)) {
printk(BIOS_DEBUG, "TPM Response: 0x%08x\n",
read_at_be32(recvbuf, sizeof(uint16_t)
+ sizeof(uint32_t)));
hexdump(recvbuf, *rbuf_len);
}
return 0;
}
|
