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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*/
#define LOG_CATEGORY UCLASS_TPM
#include <common.h>
#include <dm.h>
#include <log.h>
#include <tpm_api.h>
#include <tpm-v1.h>
#include <tpm-v2.h>
#include <dm/lists.h>
#include <linux/delay.h>
#include <linux/unaligned/be_byteshift.h>
#include "tpm_internal.h"
#define TPM_RNG_DRV_NAME "tpm-rng"
int tpm_open(struct udevice *dev)
{
struct tpm_ops *ops = tpm_get_ops(dev);
if (!ops->open)
return -ENOSYS;
return ops->open(dev);
}
int tpm_close(struct udevice *dev)
{
struct tpm_ops *ops = tpm_get_ops(dev);
if (!ops->close)
return -ENOSYS;
return ops->close(dev);
}
int tpm_get_desc(struct udevice *dev, char *buf, int size)
{
struct tpm_ops *ops = tpm_get_ops(dev);
if (!ops->get_desc)
return -ENOSYS;
return ops->get_desc(dev, buf, size);
}
int tpm_report_state(struct udevice *dev, char *buf, int size)
{
struct tpm_ops *ops = tpm_get_ops(dev);
if (!ops->report_state)
return -ENOSYS;
return ops->report_state(dev, buf, size);
}
/* Returns max number of milliseconds to wait */
static ulong tpm_tis_i2c_calc_ordinal_duration(struct tpm_chip_priv *priv,
u32 ordinal)
{
int duration_idx = TPM_UNDEFINED;
int duration = 0;
if (ordinal < TPM_MAX_ORDINAL) {
duration_idx = tpm_ordinal_duration[ordinal];
} else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
TPM_MAX_PROTECTED_ORDINAL) {
duration_idx = tpm_protected_ordinal_duration[
ordinal & TPM_PROTECTED_ORDINAL_MASK];
}
if (duration_idx != TPM_UNDEFINED)
duration = priv->duration_ms[duration_idx];
if (duration <= 0)
return 2 * 60 * 1000; /* Two minutes timeout */
else
return duration;
}
int tpm_xfer(struct udevice *dev, const uint8_t *sendbuf, size_t send_size,
uint8_t *recvbuf, size_t *recv_size)
{
struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
struct tpm_ops *ops = tpm_get_ops(dev);
ulong start, stop;
uint count, ordinal;
int ret, ret2 = 0;
if (ops->xfer)
return ops->xfer(dev, sendbuf, send_size, recvbuf, recv_size);
if (!ops->send || !ops->recv)
return -ENOSYS;
/* switch endianess: big->little */
count = get_unaligned_be32(sendbuf + TPM_CMD_COUNT_BYTE);
ordinal = get_unaligned_be32(sendbuf + TPM_CMD_ORDINAL_BYTE);
if (count == 0) {
log_debug("no data\n");
return -ENODATA;
}
if (count > send_size) {
log_debug("invalid count value %x %zx\n", count, send_size);
return -E2BIG;
}
log_debug("%s: Calling send\n", __func__);
ret = ops->send(dev, sendbuf, send_size);
if (ret < 0)
return ret;
start = get_timer(0);
stop = tpm_tis_i2c_calc_ordinal_duration(priv, ordinal);
do {
ret = ops->recv(dev, priv->buf, sizeof(priv->buf));
if (ret >= 0) {
if (ret > *recv_size)
return -ENOSPC;
memcpy(recvbuf, priv->buf, ret);
*recv_size = ret;
ret = 0;
break;
} else if (ret != -EAGAIN) {
return ret;
}
mdelay(priv->retry_time_ms);
if (get_timer(start) > stop) {
ret = -ETIMEDOUT;
break;
}
} while (ret);
if (ret) {
if (ops->cleanup) {
ret2 = ops->cleanup(dev);
if (ret2)
return log_msg_ret("cleanup", ret2);
}
return log_msg_ret("xfer", ret);
}
return 0;
}
static int tpm_uclass_post_probe(struct udevice *dev)
{
int ret;
const char *drv = TPM_RNG_DRV_NAME;
struct udevice *child;
if (CONFIG_IS_ENABLED(TPM_RNG)) {
ret = device_find_first_child_by_uclass(dev, UCLASS_RNG,
&child);
if (ret != -ENODEV) {
log_debug("RNG child already added to the TPM device\n");
return ret;
}
ret = device_bind_driver(dev, drv, TPM_RNG_DRV_NAME, &child);
if (ret)
return log_msg_ret("bind", ret);
}
return 0;
}
UCLASS_DRIVER(tpm) = {
.id = UCLASS_TPM,
.name = "tpm",
.flags = DM_UC_FLAG_SEQ_ALIAS,
#if CONFIG_IS_ENABLED(OF_REAL)
.post_bind = dm_scan_fdt_dev,
#endif
.post_probe = tpm_uclass_post_probe,
.per_device_auto = sizeof(struct tpm_chip_priv),
};
|
