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Dirk Eibachc01939c2013-06-26 15:55:15 +02001/*
Simon Glass07470d62015-08-22 18:31:21 -06002 * Copyright (C) 2013 Guntermann & Drunck, GmbH
Dirk Eibachc01939c2013-06-26 15:55:15 +02003 *
Simon Glass07470d62015-08-22 18:31:21 -06004 * Written by Dirk Eibach <eibach@gdsys.de>
Dirk Eibachc01939c2013-06-26 15:55:15 +02005 *
Simon Glass07470d62015-08-22 18:31:21 -06006 * SPDX-License-Identifier: GPL-2.0+
Dirk Eibachc01939c2013-06-26 15:55:15 +02007 */
8
9#include <common.h>
Christophe Ricard302c5db2015-10-06 22:54:42 +020010#include <dm.h>
Dirk Eibachc01939c2013-06-26 15:55:15 +020011#include <tpm.h>
12#include <i2c.h>
13#include <asm/unaligned.h>
14
Christophe Ricard302c5db2015-10-06 22:54:42 +020015#include "tpm_internal.h"
16
Dirk Eibachc01939c2013-06-26 15:55:15 +020017#define ATMEL_TPM_TIMEOUT_MS 5000 /* sufficient for anything but
18 generating/exporting keys */
19
20/*
Christophe Ricard302c5db2015-10-06 22:54:42 +020021 * tpm_atmel_twi_open()
Dirk Eibachc01939c2013-06-26 15:55:15 +020022 *
23 * Requests access to locality 0 for the caller. After all commands have been
24 * completed the caller is supposed to call tis_close().
25 *
26 * Returns 0 on success, -1 on failure.
27 */
Christophe Ricard302c5db2015-10-06 22:54:42 +020028static int tpm_atmel_twi_open(struct udevice *dev)
Dirk Eibachc01939c2013-06-26 15:55:15 +020029{
30 return 0;
31}
32
33/*
Christophe Ricard302c5db2015-10-06 22:54:42 +020034 * tpm_atmel_twi_close()
Dirk Eibachc01939c2013-06-26 15:55:15 +020035 *
36 * terminate the currect session with the TPM by releasing the locked
37 * locality. Returns 0 on success of -1 on failure (in case lock
38 * removal did not succeed).
39 */
Christophe Ricard302c5db2015-10-06 22:54:42 +020040static int tpm_atmel_twi_close(struct udevice *dev)
Dirk Eibachc01939c2013-06-26 15:55:15 +020041{
42 return 0;
43}
44
45/*
Christophe Ricard302c5db2015-10-06 22:54:42 +020046 * tpm_atmel_twi_get_desc()
47 *
48 * @dev: Device to check
49 * @buf: Buffer to put the string
50 * @size: Maximum size of buffer
51 * @return length of string, or -ENOSPC it no space
52 */
53static int tpm_atmel_twi_get_desc(struct udevice *dev, char *buf, int size)
54{
55 return 0;
56}
57
58/*
59 * tpm_atmel_twi_xfer()
Dirk Eibachc01939c2013-06-26 15:55:15 +020060 *
61 * Send the requested data to the TPM and then try to get its response
62 *
63 * @sendbuf - buffer of the data to send
64 * @send_size size of the data to send
65 * @recvbuf - memory to save the response to
66 * @recv_len - pointer to the size of the response buffer
67 *
68 * Returns 0 on success (and places the number of response bytes at recv_len)
69 * or -1 on failure.
70 */
Christophe Ricard302c5db2015-10-06 22:54:42 +020071static int tpm_atmel_twi_xfer(struct udevice *dev,
72 const uint8_t *sendbuf, size_t send_size,
73 uint8_t *recvbuf, size_t *recv_len)
Dirk Eibachc01939c2013-06-26 15:55:15 +020074{
75 int res;
76 unsigned long start;
77
78#ifdef DEBUG
79 memset(recvbuf, 0xcc, *recv_len);
80 printf("send to TPM (%d bytes, recv_len=%d):\n", send_size, *recv_len);
81 print_buffer(0, (void *)sendbuf, 1, send_size, 0);
82#endif
83
mario.six@gdsys.cc03dcd412016-07-18 13:47:45 +020084#ifndef CONFIG_DM_I2C
Dirk Eibachc01939c2013-06-26 15:55:15 +020085 res = i2c_write(0x29, 0, 0, (uchar *)sendbuf, send_size);
mario.six@gdsys.cc03dcd412016-07-18 13:47:45 +020086#else
87 res = dm_i2c_write(dev, 0, sendbuf, send_size);
88#endif
Dirk Eibachc01939c2013-06-26 15:55:15 +020089 if (res) {
90 printf("i2c_write returned %d\n", res);
91 return -1;
92 }
93
94 start = get_timer(0);
mario.six@gdsys.cc03dcd412016-07-18 13:47:45 +020095#ifndef CONFIG_DM_I2C
96 while ((res = i2c_read(0x29, 0, 0, recvbuf, 10)))
97#else
98 while ((res = dm_i2c_read(dev, 0, recvbuf, 10)))
99#endif
100 {
Christophe Ricard302c5db2015-10-06 22:54:42 +0200101 /* TODO Use TIS_TIMEOUT from tpm_tis_infineon.h */
Dirk Eibachc01939c2013-06-26 15:55:15 +0200102 if (get_timer(start) > ATMEL_TPM_TIMEOUT_MS) {
103 puts("tpm timed out\n");
104 return -1;
105 }
106 udelay(100);
107 }
108 if (!res) {
109 *recv_len = get_unaligned_be32(recvbuf + 2);
110 if (*recv_len > 10)
mario.six@gdsys.cc03dcd412016-07-18 13:47:45 +0200111#ifndef CONFIG_DM_I2C
Dirk Eibachc01939c2013-06-26 15:55:15 +0200112 res = i2c_read(0x29, 0, 0, recvbuf, *recv_len);
mario.six@gdsys.cc03dcd412016-07-18 13:47:45 +0200113#else
114 res = dm_i2c_read(dev, 0, recvbuf, *recv_len);
115#endif
Dirk Eibachc01939c2013-06-26 15:55:15 +0200116 }
117 if (res) {
118 printf("i2c_read returned %d (rlen=%d)\n", res, *recv_len);
119#ifdef DEBUG
120 print_buffer(0, recvbuf, 1, *recv_len, 0);
121#endif
122 }
123
124#ifdef DEBUG
125 if (!res) {
126 printf("read from TPM (%d bytes):\n", *recv_len);
127 print_buffer(0, recvbuf, 1, *recv_len, 0);
128 }
129#endif
130
131 return res;
132}
Christophe Ricard302c5db2015-10-06 22:54:42 +0200133
134static int tpm_atmel_twi_probe(struct udevice *dev)
135{
136 return 0;
137}
138
139static const struct udevice_id tpm_atmel_twi_ids[] = {
140 { .compatible = "atmel,at97sc3204t"},
141 { }
142};
143
144static const struct tpm_ops tpm_atmel_twi_ops = {
145 .open = tpm_atmel_twi_open,
146 .close = tpm_atmel_twi_close,
147 .xfer = tpm_atmel_twi_xfer,
148 .get_desc = tpm_atmel_twi_get_desc,
149};
150
151U_BOOT_DRIVER(tpm_atmel_twi) = {
152 .name = "tpm_atmel_twi",
153 .id = UCLASS_TPM,
154 .of_match = tpm_atmel_twi_ids,
155 .ops = &tpm_atmel_twi_ops,
156 .probe = tpm_atmel_twi_probe,
157};