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1 | /* |
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 | ||
14 | int 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 | ||
24 | int 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 | ||
34 | int 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 */ | |
45 | static 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 | ||
68 | int 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 | ||
128 | UCLASS_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 | }; |