blob: b6e1fc5e6280bafaefe9f98d0539d72fca46871d [file] [log] [blame]
Simon Glassf255d312015-08-22 18:31:31 -06001/*
2 * Copyright (c) 2015 Google, Inc
3 * Written by Simon Glass <sjg@chromium.org>
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8#include <common.h>
9#include <dm.h>
10#include <tpm.h>
11#include <linux/unaligned/be_byteshift.h>
12#include "tpm_internal.h"
13
14int tpm_open(struct udevice *dev)
15{
16 struct tpm_ops *ops = tpm_get_ops(dev);
17
18 if (!ops->open)
19 return -ENOSYS;
20
21 return ops->open(dev);
22}
23
24int tpm_close(struct udevice *dev)
25{
26 struct tpm_ops *ops = tpm_get_ops(dev);
27
28 if (!ops->close)
29 return -ENOSYS;
30
31 return ops->close(dev);
32}
33
34int tpm_get_desc(struct udevice *dev, char *buf, int size)
35{
36 struct tpm_ops *ops = tpm_get_ops(dev);
37
38 if (!ops->get_desc)
39 return -ENOSYS;
40
41 return ops->get_desc(dev, buf, size);
42}
43
44/* Returns max number of milliseconds to wait */
45static ulong tpm_tis_i2c_calc_ordinal_duration(struct tpm_chip_priv *priv,
46 u32 ordinal)
47{
48 int duration_idx = TPM_UNDEFINED;
49 int duration = 0;
50
51 if (ordinal < TPM_MAX_ORDINAL) {
52 duration_idx = tpm_ordinal_duration[ordinal];
53 } else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
54 TPM_MAX_PROTECTED_ORDINAL) {
55 duration_idx = tpm_protected_ordinal_duration[
56 ordinal & TPM_PROTECTED_ORDINAL_MASK];
57 }
58
59 if (duration_idx != TPM_UNDEFINED)
60 duration = priv->duration_ms[duration_idx];
61
62 if (duration <= 0)
63 return 2 * 60 * 1000; /* Two minutes timeout */
64 else
65 return duration;
66}
67
68int tpm_xfer(struct udevice *dev, const uint8_t *sendbuf, size_t send_size,
69 uint8_t *recvbuf, size_t *recv_size)
70{
71 struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
72 struct tpm_ops *ops = tpm_get_ops(dev);
73 ulong start, stop;
74 uint count, ordinal;
75 int ret, ret2;
76
77 if (ops->xfer)
78 return ops->xfer(dev, sendbuf, send_size, recvbuf, recv_size);
79
80 if (!ops->send || !ops->recv)
81 return -ENOSYS;
82
83 /* switch endianess: big->little */
84 count = get_unaligned_be32(sendbuf + TPM_CMD_COUNT_BYTE);
85 ordinal = get_unaligned_be32(sendbuf + TPM_CMD_ORDINAL_BYTE);
86
87 if (count == 0) {
88 debug("no data\n");
89 return -ENODATA;
90 }
91 if (count > send_size) {
92 debug("invalid count value %x %zx\n", count, send_size);
93 return -E2BIG;
94 }
95
96 debug("%s: Calling send\n", __func__);
97 ret = ops->send(dev, sendbuf, send_size);
98 if (ret < 0)
99 return ret;
100
101 start = get_timer(0);
102 stop = tpm_tis_i2c_calc_ordinal_duration(priv, ordinal);
103 do {
104 ret = ops->recv(dev, priv->buf, sizeof(priv->buf));
105 if (ret >= 0) {
106 if (ret > *recv_size)
107 return -ENOSPC;
108 memcpy(recvbuf, priv->buf, ret);
109 *recv_size = ret;
110 ret = 0;
111 break;
112 } else if (ret != -EAGAIN) {
113 return ret;
114 }
115
116 mdelay(priv->retry_time_ms);
117 if (get_timer(start) > stop) {
118 ret = -ETIMEDOUT;
119 break;
120 }
121 } while (ret);
122
123 ret2 = ops->cleanup ? ops->cleanup(dev) : 0;
124
125 return ret2 ? ret2 : ret;
126}
127
128UCLASS_DRIVER(tpm) = {
129 .id = UCLASS_TPM,
130 .name = "tpm",
131 .flags = DM_UC_FLAG_SEQ_ALIAS,
132 .per_device_auto_alloc_size = sizeof(struct tpm_chip_priv),
133};