1*f255d31fSSimon Glass /*
2*f255d31fSSimon Glass * Copyright (c) 2015 Google, Inc
3*f255d31fSSimon Glass * Written by Simon Glass <sjg@chromium.org>
4*f255d31fSSimon Glass *
5*f255d31fSSimon Glass * SPDX-License-Identifier: GPL-2.0+
6*f255d31fSSimon Glass */
7*f255d31fSSimon Glass
8*f255d31fSSimon Glass #include <common.h>
9*f255d31fSSimon Glass #include <dm.h>
10*f255d31fSSimon Glass #include <tpm.h>
11*f255d31fSSimon Glass #include <linux/unaligned/be_byteshift.h>
12*f255d31fSSimon Glass #include "tpm_internal.h"
13*f255d31fSSimon Glass
tpm_open(struct udevice * dev)14*f255d31fSSimon Glass int tpm_open(struct udevice *dev)
15*f255d31fSSimon Glass {
16*f255d31fSSimon Glass struct tpm_ops *ops = tpm_get_ops(dev);
17*f255d31fSSimon Glass
18*f255d31fSSimon Glass if (!ops->open)
19*f255d31fSSimon Glass return -ENOSYS;
20*f255d31fSSimon Glass
21*f255d31fSSimon Glass return ops->open(dev);
22*f255d31fSSimon Glass }
23*f255d31fSSimon Glass
tpm_close(struct udevice * dev)24*f255d31fSSimon Glass int tpm_close(struct udevice *dev)
25*f255d31fSSimon Glass {
26*f255d31fSSimon Glass struct tpm_ops *ops = tpm_get_ops(dev);
27*f255d31fSSimon Glass
28*f255d31fSSimon Glass if (!ops->close)
29*f255d31fSSimon Glass return -ENOSYS;
30*f255d31fSSimon Glass
31*f255d31fSSimon Glass return ops->close(dev);
32*f255d31fSSimon Glass }
33*f255d31fSSimon Glass
tpm_get_desc(struct udevice * dev,char * buf,int size)34*f255d31fSSimon Glass int tpm_get_desc(struct udevice *dev, char *buf, int size)
35*f255d31fSSimon Glass {
36*f255d31fSSimon Glass struct tpm_ops *ops = tpm_get_ops(dev);
37*f255d31fSSimon Glass
38*f255d31fSSimon Glass if (!ops->get_desc)
39*f255d31fSSimon Glass return -ENOSYS;
40*f255d31fSSimon Glass
41*f255d31fSSimon Glass return ops->get_desc(dev, buf, size);
42*f255d31fSSimon Glass }
43*f255d31fSSimon Glass
44*f255d31fSSimon Glass /* Returns max number of milliseconds to wait */
tpm_tis_i2c_calc_ordinal_duration(struct tpm_chip_priv * priv,u32 ordinal)45*f255d31fSSimon Glass static ulong tpm_tis_i2c_calc_ordinal_duration(struct tpm_chip_priv *priv,
46*f255d31fSSimon Glass u32 ordinal)
47*f255d31fSSimon Glass {
48*f255d31fSSimon Glass int duration_idx = TPM_UNDEFINED;
49*f255d31fSSimon Glass int duration = 0;
50*f255d31fSSimon Glass
51*f255d31fSSimon Glass if (ordinal < TPM_MAX_ORDINAL) {
52*f255d31fSSimon Glass duration_idx = tpm_ordinal_duration[ordinal];
53*f255d31fSSimon Glass } else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
54*f255d31fSSimon Glass TPM_MAX_PROTECTED_ORDINAL) {
55*f255d31fSSimon Glass duration_idx = tpm_protected_ordinal_duration[
56*f255d31fSSimon Glass ordinal & TPM_PROTECTED_ORDINAL_MASK];
57*f255d31fSSimon Glass }
58*f255d31fSSimon Glass
59*f255d31fSSimon Glass if (duration_idx != TPM_UNDEFINED)
60*f255d31fSSimon Glass duration = priv->duration_ms[duration_idx];
61*f255d31fSSimon Glass
62*f255d31fSSimon Glass if (duration <= 0)
63*f255d31fSSimon Glass return 2 * 60 * 1000; /* Two minutes timeout */
64*f255d31fSSimon Glass else
65*f255d31fSSimon Glass return duration;
66*f255d31fSSimon Glass }
67*f255d31fSSimon Glass
tpm_xfer(struct udevice * dev,const uint8_t * sendbuf,size_t send_size,uint8_t * recvbuf,size_t * recv_size)68*f255d31fSSimon Glass int tpm_xfer(struct udevice *dev, const uint8_t *sendbuf, size_t send_size,
69*f255d31fSSimon Glass uint8_t *recvbuf, size_t *recv_size)
70*f255d31fSSimon Glass {
71*f255d31fSSimon Glass struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
72*f255d31fSSimon Glass struct tpm_ops *ops = tpm_get_ops(dev);
73*f255d31fSSimon Glass ulong start, stop;
74*f255d31fSSimon Glass uint count, ordinal;
75*f255d31fSSimon Glass int ret, ret2;
76*f255d31fSSimon Glass
77*f255d31fSSimon Glass if (ops->xfer)
78*f255d31fSSimon Glass return ops->xfer(dev, sendbuf, send_size, recvbuf, recv_size);
79*f255d31fSSimon Glass
80*f255d31fSSimon Glass if (!ops->send || !ops->recv)
81*f255d31fSSimon Glass return -ENOSYS;
82*f255d31fSSimon Glass
83*f255d31fSSimon Glass /* switch endianess: big->little */
84*f255d31fSSimon Glass count = get_unaligned_be32(sendbuf + TPM_CMD_COUNT_BYTE);
85*f255d31fSSimon Glass ordinal = get_unaligned_be32(sendbuf + TPM_CMD_ORDINAL_BYTE);
86*f255d31fSSimon Glass
87*f255d31fSSimon Glass if (count == 0) {
88*f255d31fSSimon Glass debug("no data\n");
89*f255d31fSSimon Glass return -ENODATA;
90*f255d31fSSimon Glass }
91*f255d31fSSimon Glass if (count > send_size) {
92*f255d31fSSimon Glass debug("invalid count value %x %zx\n", count, send_size);
93*f255d31fSSimon Glass return -E2BIG;
94*f255d31fSSimon Glass }
95*f255d31fSSimon Glass
96*f255d31fSSimon Glass debug("%s: Calling send\n", __func__);
97*f255d31fSSimon Glass ret = ops->send(dev, sendbuf, send_size);
98*f255d31fSSimon Glass if (ret < 0)
99*f255d31fSSimon Glass return ret;
100*f255d31fSSimon Glass
101*f255d31fSSimon Glass start = get_timer(0);
102*f255d31fSSimon Glass stop = tpm_tis_i2c_calc_ordinal_duration(priv, ordinal);
103*f255d31fSSimon Glass do {
104*f255d31fSSimon Glass ret = ops->recv(dev, priv->buf, sizeof(priv->buf));
105*f255d31fSSimon Glass if (ret >= 0) {
106*f255d31fSSimon Glass if (ret > *recv_size)
107*f255d31fSSimon Glass return -ENOSPC;
108*f255d31fSSimon Glass memcpy(recvbuf, priv->buf, ret);
109*f255d31fSSimon Glass *recv_size = ret;
110*f255d31fSSimon Glass ret = 0;
111*f255d31fSSimon Glass break;
112*f255d31fSSimon Glass } else if (ret != -EAGAIN) {
113*f255d31fSSimon Glass return ret;
114*f255d31fSSimon Glass }
115*f255d31fSSimon Glass
116*f255d31fSSimon Glass mdelay(priv->retry_time_ms);
117*f255d31fSSimon Glass if (get_timer(start) > stop) {
118*f255d31fSSimon Glass ret = -ETIMEDOUT;
119*f255d31fSSimon Glass break;
120*f255d31fSSimon Glass }
121*f255d31fSSimon Glass } while (ret);
122*f255d31fSSimon Glass
123*f255d31fSSimon Glass ret2 = ops->cleanup ? ops->cleanup(dev) : 0;
124*f255d31fSSimon Glass
125*f255d31fSSimon Glass return ret2 ? ret2 : ret;
126*f255d31fSSimon Glass }
127*f255d31fSSimon Glass
128*f255d31fSSimon Glass UCLASS_DRIVER(tpm) = {
129*f255d31fSSimon Glass .id = UCLASS_TPM,
130*f255d31fSSimon Glass .name = "tpm",
131*f255d31fSSimon Glass .flags = DM_UC_FLAG_SEQ_ALIAS,
132*f255d31fSSimon Glass .per_device_auto_alloc_size = sizeof(struct tpm_chip_priv),
133*f255d31fSSimon Glass };
134