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Tom Rini10e47792018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0
Rong Chang8faa9452013-04-12 10:44:57 +00002/*
3 * Copyright (C) 2011 Infineon Technologies
4 *
5 * Authors:
6 * Peter Huewe <huewe.external@infineon.com>
7 *
8 * Description:
9 * Device driver for TCG/TCPA TPM (trusted platform module).
10 * Specifications at www.trustedcomputinggroup.org
11 *
12 * This device driver implements the TPM interface as defined in
13 * the TCG TPM Interface Spec version 1.2, revision 1.0 and the
14 * Infineon I2C Protocol Stack Specification v0.20.
15 *
16 * It is based on the Linux kernel driver tpm.c from Leendert van
17 * Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall.
18 *
19 * Version: 2.1.1
Rong Chang8faa9452013-04-12 10:44:57 +000020 */
21
Simon Glassc9a3e842015-05-04 11:30:59 -060022#include <dm.h>
Vincent Palatin06883eb2013-04-12 11:04:36 +000023#include <fdtdec.h>
Rong Chang8faa9452013-04-12 10:44:57 +000024#include <i2c.h>
Simon Glass0f2af882020-05-10 11:40:05 -060025#include <log.h>
Tom Rinie1e57222024-05-01 19:31:28 -060026#include <time.h>
Miquel Raynal4c6759e2018-05-15 11:57:06 +020027#include <tpm-v1.h>
Simon Glassdbd79542020-05-10 11:40:11 -060028#include <linux/delay.h>
Masahiro Yamada64e4f7f2016-09-21 11:28:57 +090029#include <linux/errno.h>
Simon Glasscd8cc672015-08-22 18:31:38 -060030#include <linux/compiler.h>
Simon Glassbdd5f812023-09-14 18:21:46 -060031#include <linux/printk.h>
Rong Chang8faa9452013-04-12 10:44:57 +000032#include <linux/types.h>
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +000033#include <linux/unaligned/be_byteshift.h>
Rong Chang8faa9452013-04-12 10:44:57 +000034
Christophe Ricard26549522016-01-21 23:27:12 +010035#include "tpm_tis.h"
Simon Glass6c7a2322015-08-22 18:31:31 -060036#include "tpm_internal.h"
Rong Chang8faa9452013-04-12 10:44:57 +000037
Christophe Ricard26549522016-01-21 23:27:12 +010038enum i2c_chip_type {
39 SLB9635,
40 SLB9645,
41 UNKNOWN,
42};
43
44/* expected value for DIDVID register */
45#define TPM_TIS_I2C_DID_VID_9635 0x000b15d1L
46#define TPM_TIS_I2C_DID_VID_9645 0x001a15d1L
47
Vincent Palatin06883eb2013-04-12 11:04:36 +000048static const char * const chip_name[] = {
49 [SLB9635] = "slb9635tt",
50 [SLB9645] = "slb9645tt",
51 [UNKNOWN] = "unknown/fallback to slb9635",
52};
Rong Chang8faa9452013-04-12 10:44:57 +000053
Ilias Apalodimas228c57c2021-11-09 09:02:15 +020054#define TPM_INFINEON_ACCESS(l) (0x0000 | ((l) << 4))
55#define TPM_INFINEON_STS(l) (0x0001 | ((l) << 4))
56#define TPM_INFINEON_DATA_FIFO(l) (0x0005 | ((l) << 4))
57#define TPM_INFINEON_DID_VID(l) (0x0006 | ((l) << 4))
Christophe Ricard26549522016-01-21 23:27:12 +010058
Rong Chang8faa9452013-04-12 10:44:57 +000059/*
Simon Glass7ccebaf2015-08-22 18:31:29 -060060 * tpm_tis_i2c_read() - read from TPM register
Rong Chang8faa9452013-04-12 10:44:57 +000061 * @addr: register address to read from
62 * @buffer: provided by caller
63 * @len: number of bytes to read
64 *
65 * Read len bytes from TPM register and put them into
66 * buffer (little-endian format, i.e. first byte is put into buffer[0]).
67 *
68 * NOTE: TPM is big-endian for multi-byte values. Multi-byte
69 * values have to be swapped.
70 *
71 * Return -EIO on error, 0 on success.
72 */
Simon Glasscd8cc672015-08-22 18:31:38 -060073static int tpm_tis_i2c_read(struct udevice *dev, u8 addr, u8 *buffer,
74 size_t len)
Rong Chang8faa9452013-04-12 10:44:57 +000075{
Simon Glasscd8cc672015-08-22 18:31:38 -060076 struct tpm_chip *chip = dev_get_priv(dev);
Rong Chang8faa9452013-04-12 10:44:57 +000077 int rc;
78 int count;
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +000079 uint32_t addrbuf = addr;
Rong Chang8faa9452013-04-12 10:44:57 +000080
Simon Glasscd8cc672015-08-22 18:31:38 -060081 if ((chip->chip_type == SLB9635) || (chip->chip_type == UNKNOWN)) {
Vincent Palatin06883eb2013-04-12 11:04:36 +000082 /* slb9635 protocol should work in both cases */
83 for (count = 0; count < MAX_COUNT; count++) {
Simon Glasscd8cc672015-08-22 18:31:38 -060084 rc = dm_i2c_write(dev, 0, (uchar *)&addrbuf, 1);
Vincent Palatin06883eb2013-04-12 11:04:36 +000085 if (rc == 0)
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +000086 break; /* Success, break to skip sleep */
Simon Glassa57bcee2015-08-22 18:31:30 -060087 udelay(SLEEP_DURATION_US);
Vincent Palatin06883eb2013-04-12 11:04:36 +000088 }
Vincent Palatin06883eb2013-04-12 11:04:36 +000089 if (rc)
Simon Glasscd8cc672015-08-22 18:31:38 -060090 return rc;
Rong Chang8faa9452013-04-12 10:44:57 +000091
Vincent Palatin06883eb2013-04-12 11:04:36 +000092 /* After the TPM has successfully received the register address
93 * it needs some time, thus we're sleeping here again, before
94 * retrieving the data
95 */
96 for (count = 0; count < MAX_COUNT; count++) {
Simon Glassa57bcee2015-08-22 18:31:30 -060097 udelay(SLEEP_DURATION_US);
Simon Glasscd8cc672015-08-22 18:31:38 -060098 rc = dm_i2c_read(dev, 0, buffer, len);
Vincent Palatin06883eb2013-04-12 11:04:36 +000099 if (rc == 0)
100 break; /* success, break to skip sleep */
101 }
102 } else {
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000103 /*
104 * Use a combined read for newer chips.
105 * Unfortunately the smbus functions are not suitable due to
Vincent Palatin06883eb2013-04-12 11:04:36 +0000106 * the 32 byte limit of the smbus.
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000107 * Retries should usually not be needed, but are kept just to
Vincent Palatin06883eb2013-04-12 11:04:36 +0000108 * be safe on the safe side.
109 */
110 for (count = 0; count < MAX_COUNT; count++) {
Simon Glasscd8cc672015-08-22 18:31:38 -0600111 rc = dm_i2c_read(dev, addr, buffer, len);
Vincent Palatin06883eb2013-04-12 11:04:36 +0000112 if (rc == 0)
113 break; /* break here to skip sleep */
Simon Glassa57bcee2015-08-22 18:31:30 -0600114 udelay(SLEEP_DURATION_US);
Vincent Palatin06883eb2013-04-12 11:04:36 +0000115 }
Rong Chang8faa9452013-04-12 10:44:57 +0000116 }
117
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000118 /* Take care of 'guard time' */
Simon Glassa57bcee2015-08-22 18:31:30 -0600119 udelay(SLEEP_DURATION_US);
Rong Chang8faa9452013-04-12 10:44:57 +0000120 if (rc)
Simon Glasscd8cc672015-08-22 18:31:38 -0600121 return rc;
Rong Chang8faa9452013-04-12 10:44:57 +0000122
123 return 0;
124}
125
Simon Glasscd8cc672015-08-22 18:31:38 -0600126static int tpm_tis_i2c_write_generic(struct udevice *dev, u8 addr,
127 const u8 *buffer, size_t len,
Simon Glassa57bcee2015-08-22 18:31:30 -0600128 unsigned int sleep_time_us, u8 max_count)
Rong Chang8faa9452013-04-12 10:44:57 +0000129{
Simon Glasscd8cc672015-08-22 18:31:38 -0600130 struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
131 struct tpm_chip *chip = dev_get_priv(dev);
Rong Chang8faa9452013-04-12 10:44:57 +0000132 int rc = 0;
133 int count;
134
Simon Glasscd8cc672015-08-22 18:31:38 -0600135 if (chip->chip_type == SLB9635) {
136 /* Prepare send buffer to include the address */
137 priv->buf[0] = addr;
138 memcpy(&(priv->buf[1]), buffer, len);
139 buffer = priv->buf;
140 len++;
141 addr = 0;
142 }
143
Rong Chang8faa9452013-04-12 10:44:57 +0000144 for (count = 0; count < max_count; count++) {
Simon Glasscd8cc672015-08-22 18:31:38 -0600145 rc = dm_i2c_write(dev, addr, buffer, len);
Rong Chang8faa9452013-04-12 10:44:57 +0000146 if (rc == 0)
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000147 break; /* Success, break to skip sleep */
Simon Glassa57bcee2015-08-22 18:31:30 -0600148 udelay(sleep_time_us);
Rong Chang8faa9452013-04-12 10:44:57 +0000149 }
150
Vincent Palatin06883eb2013-04-12 11:04:36 +0000151 /* take care of 'guard time' */
Simon Glassa57bcee2015-08-22 18:31:30 -0600152 udelay(sleep_time_us);
Rong Chang8faa9452013-04-12 10:44:57 +0000153 if (rc)
Simon Glasscd8cc672015-08-22 18:31:38 -0600154 return rc;
Rong Chang8faa9452013-04-12 10:44:57 +0000155
156 return 0;
157}
158
159/*
Simon Glass7ccebaf2015-08-22 18:31:29 -0600160 * tpm_tis_i2c_write() - write to TPM register
Rong Chang8faa9452013-04-12 10:44:57 +0000161 * @addr: register address to write to
162 * @buffer: containing data to be written
163 * @len: number of bytes to write
164 *
165 * Write len bytes from provided buffer to TPM register (little
166 * endian format, i.e. buffer[0] is written as first byte).
167 *
168 * NOTE: TPM is big-endian for multi-byte values. Multi-byte
169 * values have to be swapped.
170 *
Simon Glass7ccebaf2015-08-22 18:31:29 -0600171 * NOTE: use this function instead of the tpm_tis_i2c_write_generic function.
Rong Chang8faa9452013-04-12 10:44:57 +0000172 *
173 * Return -EIO on error, 0 on success
174 */
Simon Glasscd8cc672015-08-22 18:31:38 -0600175static int tpm_tis_i2c_write(struct udevice *dev, u8 addr, const u8 *buffer,
176 size_t len)
Rong Chang8faa9452013-04-12 10:44:57 +0000177{
Simon Glasscd8cc672015-08-22 18:31:38 -0600178 return tpm_tis_i2c_write_generic(dev, addr, buffer, len,
179 SLEEP_DURATION_US, MAX_COUNT);
Rong Chang8faa9452013-04-12 10:44:57 +0000180}
181
182/*
183 * This function is needed especially for the cleanup situation after
184 * sending TPM_READY
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000185 */
Simon Glasscd8cc672015-08-22 18:31:38 -0600186static int tpm_tis_i2c_write_long(struct udevice *dev, u8 addr, u8 *buffer,
187 size_t len)
Rong Chang8faa9452013-04-12 10:44:57 +0000188{
Simon Glasscd8cc672015-08-22 18:31:38 -0600189 return tpm_tis_i2c_write_generic(dev, addr, buffer, len,
Simon Glassa57bcee2015-08-22 18:31:30 -0600190 SLEEP_DURATION_LONG_US,
191 MAX_COUNT_LONG);
Rong Chang8faa9452013-04-12 10:44:57 +0000192}
193
Simon Glasscd8cc672015-08-22 18:31:38 -0600194static int tpm_tis_i2c_check_locality(struct udevice *dev, int loc)
Rong Chang8faa9452013-04-12 10:44:57 +0000195{
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000196 const u8 mask = TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID;
Simon Glasscd8cc672015-08-22 18:31:38 -0600197 struct tpm_chip *chip = dev_get_priv(dev);
Rong Chang8faa9452013-04-12 10:44:57 +0000198 u8 buf;
199 int rc;
200
Ilias Apalodimas228c57c2021-11-09 09:02:15 +0200201 rc = tpm_tis_i2c_read(dev, TPM_INFINEON_ACCESS(loc), &buf, 1);
Rong Chang8faa9452013-04-12 10:44:57 +0000202 if (rc < 0)
203 return rc;
204
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000205 if ((buf & mask) == mask) {
Simon Glassab79b002015-08-22 18:31:24 -0600206 chip->locality = loc;
Rong Chang8faa9452013-04-12 10:44:57 +0000207 return loc;
208 }
209
Simon Glasscd8cc672015-08-22 18:31:38 -0600210 return -ENOENT;
Rong Chang8faa9452013-04-12 10:44:57 +0000211}
212
Simon Glasscd8cc672015-08-22 18:31:38 -0600213static void tpm_tis_i2c_release_locality(struct udevice *dev, int loc,
Simon Glass7ccebaf2015-08-22 18:31:29 -0600214 int force)
Rong Chang8faa9452013-04-12 10:44:57 +0000215{
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000216 const u8 mask = TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID;
Rong Chang8faa9452013-04-12 10:44:57 +0000217 u8 buf;
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000218
Ilias Apalodimas228c57c2021-11-09 09:02:15 +0200219 if (tpm_tis_i2c_read(dev, TPM_INFINEON_ACCESS(loc), &buf, 1) < 0)
Rong Chang8faa9452013-04-12 10:44:57 +0000220 return;
221
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000222 if (force || (buf & mask) == mask) {
Rong Chang8faa9452013-04-12 10:44:57 +0000223 buf = TPM_ACCESS_ACTIVE_LOCALITY;
Ilias Apalodimas228c57c2021-11-09 09:02:15 +0200224 tpm_tis_i2c_write(dev, TPM_INFINEON_ACCESS(loc), &buf, 1);
Rong Chang8faa9452013-04-12 10:44:57 +0000225 }
226}
227
Simon Glasscd8cc672015-08-22 18:31:38 -0600228static int tpm_tis_i2c_request_locality(struct udevice *dev, int loc)
Rong Chang8faa9452013-04-12 10:44:57 +0000229{
Simon Glasscd8cc672015-08-22 18:31:38 -0600230 struct tpm_chip *chip = dev_get_priv(dev);
Rong Chang8faa9452013-04-12 10:44:57 +0000231 unsigned long start, stop;
232 u8 buf = TPM_ACCESS_REQUEST_USE;
Simon Glassc9a3e842015-05-04 11:30:59 -0600233 int rc;
Rong Chang8faa9452013-04-12 10:44:57 +0000234
Simon Glasscd8cc672015-08-22 18:31:38 -0600235 rc = tpm_tis_i2c_check_locality(dev, loc);
236 if (rc >= 0) {
237 debug("%s: Already have locality\n", __func__);
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000238 return loc; /* We already have the locality */
Simon Glasscd8cc672015-08-22 18:31:38 -0600239 } else if (rc != -ENOENT) {
240 debug("%s: Failed to get locality: %d\n", __func__, rc);
241 return rc;
242 }
Rong Chang8faa9452013-04-12 10:44:57 +0000243
Ilias Apalodimas228c57c2021-11-09 09:02:15 +0200244 rc = tpm_tis_i2c_write(dev, TPM_INFINEON_ACCESS(loc), &buf, 1);
Simon Glasscd8cc672015-08-22 18:31:38 -0600245 if (rc) {
246 debug("%s: Failed to write to TPM: %d\n", __func__, rc);
Simon Glassc9a3e842015-05-04 11:30:59 -0600247 return rc;
Simon Glasscd8cc672015-08-22 18:31:38 -0600248 }
Rong Chang8faa9452013-04-12 10:44:57 +0000249
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000250 /* Wait for burstcount */
Rong Chang8faa9452013-04-12 10:44:57 +0000251 start = get_timer(0);
Simon Glassab79b002015-08-22 18:31:24 -0600252 stop = chip->timeout_a;
Rong Chang8faa9452013-04-12 10:44:57 +0000253 do {
Simon Glasscd8cc672015-08-22 18:31:38 -0600254 rc = tpm_tis_i2c_check_locality(dev, loc);
255 if (rc >= 0) {
256 debug("%s: Have locality\n", __func__);
Rong Chang8faa9452013-04-12 10:44:57 +0000257 return loc;
Simon Glasscd8cc672015-08-22 18:31:38 -0600258 } else if (rc != -ENOENT) {
259 debug("%s: Failed to get locality: %d\n", __func__, rc);
260 return rc;
261 }
Simon Glassa57bcee2015-08-22 18:31:30 -0600262 mdelay(TPM_TIMEOUT_MS);
Rong Chang8faa9452013-04-12 10:44:57 +0000263 } while (get_timer(start) < stop);
Simon Glasscd8cc672015-08-22 18:31:38 -0600264 debug("%s: Timeout getting locality: %d\n", __func__, rc);
Rong Chang8faa9452013-04-12 10:44:57 +0000265
Simon Glasscd8cc672015-08-22 18:31:38 -0600266 return rc;
Rong Chang8faa9452013-04-12 10:44:57 +0000267}
268
Simon Glasscd8cc672015-08-22 18:31:38 -0600269static u8 tpm_tis_i2c_status(struct udevice *dev)
Rong Chang8faa9452013-04-12 10:44:57 +0000270{
Simon Glasscd8cc672015-08-22 18:31:38 -0600271 struct tpm_chip *chip = dev_get_priv(dev);
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000272 /* NOTE: Since i2c read may fail, return 0 in this case --> time-out */
Rong Chang8faa9452013-04-12 10:44:57 +0000273 u8 buf;
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000274
Ilias Apalodimas228c57c2021-11-09 09:02:15 +0200275 if (tpm_tis_i2c_read(dev, TPM_INFINEON_STS(chip->locality), &buf, 1) < 0)
Rong Chang8faa9452013-04-12 10:44:57 +0000276 return 0;
277 else
278 return buf;
279}
280
Simon Glasscd8cc672015-08-22 18:31:38 -0600281static int tpm_tis_i2c_ready(struct udevice *dev)
Rong Chang8faa9452013-04-12 10:44:57 +0000282{
Simon Glasscd8cc672015-08-22 18:31:38 -0600283 struct tpm_chip *chip = dev_get_priv(dev);
Simon Glassc9a3e842015-05-04 11:30:59 -0600284 int rc;
285
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000286 /* This causes the current command to be aborted */
Rong Chang8faa9452013-04-12 10:44:57 +0000287 u8 buf = TPM_STS_COMMAND_READY;
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000288
Simon Glassc9a3e842015-05-04 11:30:59 -0600289 debug("%s\n", __func__);
Ilias Apalodimas228c57c2021-11-09 09:02:15 +0200290 rc = tpm_tis_i2c_write_long(dev, TPM_INFINEON_STS(chip->locality), &buf, 1);
Simon Glassc9a3e842015-05-04 11:30:59 -0600291 if (rc)
292 debug("%s: rc=%d\n", __func__, rc);
Simon Glasscd8cc672015-08-22 18:31:38 -0600293
294 return rc;
Rong Chang8faa9452013-04-12 10:44:57 +0000295}
296
Simon Glasscd8cc672015-08-22 18:31:38 -0600297static ssize_t tpm_tis_i2c_get_burstcount(struct udevice *dev)
Rong Chang8faa9452013-04-12 10:44:57 +0000298{
Simon Glasscd8cc672015-08-22 18:31:38 -0600299 struct tpm_chip *chip = dev_get_priv(dev);
Rong Chang8faa9452013-04-12 10:44:57 +0000300 unsigned long start, stop;
301 ssize_t burstcnt;
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000302 u8 addr, buf[3];
Rong Chang8faa9452013-04-12 10:44:57 +0000303
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000304 /* Wait for burstcount */
305 /* XXX: Which timeout value? Spec has 2 answers (c & d) */
Rong Chang8faa9452013-04-12 10:44:57 +0000306 start = get_timer(0);
Simon Glassab79b002015-08-22 18:31:24 -0600307 stop = chip->timeout_d;
Rong Chang8faa9452013-04-12 10:44:57 +0000308 do {
309 /* Note: STS is little endian */
Ilias Apalodimas228c57c2021-11-09 09:02:15 +0200310 addr = TPM_INFINEON_STS(chip->locality) + 1;
Simon Glasscd8cc672015-08-22 18:31:38 -0600311 if (tpm_tis_i2c_read(dev, addr, buf, 3) < 0)
Rong Chang8faa9452013-04-12 10:44:57 +0000312 burstcnt = 0;
313 else
314 burstcnt = (buf[2] << 16) + (buf[1] << 8) + buf[0];
315
316 if (burstcnt)
317 return burstcnt;
Simon Glassa57bcee2015-08-22 18:31:30 -0600318 mdelay(TPM_TIMEOUT_MS);
Rong Chang8faa9452013-04-12 10:44:57 +0000319 } while (get_timer(start) < stop);
320
321 return -EBUSY;
322}
323
Simon Glasscd8cc672015-08-22 18:31:38 -0600324static int tpm_tis_i2c_wait_for_stat(struct udevice *dev, u8 mask,
Simon Glass7ccebaf2015-08-22 18:31:29 -0600325 unsigned long timeout, int *status)
Rong Chang8faa9452013-04-12 10:44:57 +0000326{
327 unsigned long start, stop;
328
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000329 /* Check current status */
Simon Glasscd8cc672015-08-22 18:31:38 -0600330 *status = tpm_tis_i2c_status(dev);
Rong Chang8faa9452013-04-12 10:44:57 +0000331 if ((*status & mask) == mask)
332 return 0;
333
334 start = get_timer(0);
335 stop = timeout;
336 do {
Simon Glassa57bcee2015-08-22 18:31:30 -0600337 mdelay(TPM_TIMEOUT_MS);
Simon Glasscd8cc672015-08-22 18:31:38 -0600338 *status = tpm_tis_i2c_status(dev);
Rong Chang8faa9452013-04-12 10:44:57 +0000339 if ((*status & mask) == mask)
340 return 0;
Rong Chang8faa9452013-04-12 10:44:57 +0000341 } while (get_timer(start) < stop);
342
Simon Glasscd8cc672015-08-22 18:31:38 -0600343 return -ETIMEDOUT;
Rong Chang8faa9452013-04-12 10:44:57 +0000344}
345
Simon Glasscd8cc672015-08-22 18:31:38 -0600346static int tpm_tis_i2c_recv_data(struct udevice *dev, u8 *buf, size_t count)
Rong Chang8faa9452013-04-12 10:44:57 +0000347{
Simon Glasscd8cc672015-08-22 18:31:38 -0600348 struct tpm_chip *chip = dev_get_priv(dev);
Rong Chang8faa9452013-04-12 10:44:57 +0000349 size_t size = 0;
350 ssize_t burstcnt;
351 int rc;
352
353 while (size < count) {
Simon Glasscd8cc672015-08-22 18:31:38 -0600354 burstcnt = tpm_tis_i2c_get_burstcount(dev);
Rong Chang8faa9452013-04-12 10:44:57 +0000355
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000356 /* burstcount < 0 -> tpm is busy */
Rong Chang8faa9452013-04-12 10:44:57 +0000357 if (burstcnt < 0)
358 return burstcnt;
359
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000360 /* Limit received data to max left */
Rong Chang8faa9452013-04-12 10:44:57 +0000361 if (burstcnt > (count - size))
362 burstcnt = count - size;
363
Ilias Apalodimas228c57c2021-11-09 09:02:15 +0200364 rc = tpm_tis_i2c_read(dev, TPM_INFINEON_DATA_FIFO(chip->locality),
Simon Glasscd8cc672015-08-22 18:31:38 -0600365 &(buf[size]), burstcnt);
Rong Chang8faa9452013-04-12 10:44:57 +0000366 if (rc == 0)
367 size += burstcnt;
368 }
369
370 return size;
371}
372
Simon Glasscd8cc672015-08-22 18:31:38 -0600373static int tpm_tis_i2c_recv(struct udevice *dev, u8 *buf, size_t count)
Rong Chang8faa9452013-04-12 10:44:57 +0000374{
Simon Glasscd8cc672015-08-22 18:31:38 -0600375 struct tpm_chip *chip = dev_get_priv(dev);
Rong Chang8faa9452013-04-12 10:44:57 +0000376 int size = 0;
Jeremy Boone4dc0eca2018-02-12 17:56:36 -0500377 int status;
378 unsigned int expected;
Simon Glasscd8cc672015-08-22 18:31:38 -0600379 int rc;
Rong Chang8faa9452013-04-12 10:44:57 +0000380
Simon Glasscd8cc672015-08-22 18:31:38 -0600381 status = tpm_tis_i2c_status(dev);
382 if (status == TPM_STS_COMMAND_READY)
383 return -EINTR;
384 if ((status & (TPM_STS_DATA_AVAIL | TPM_STS_VALID)) !=
385 (TPM_STS_DATA_AVAIL | TPM_STS_VALID))
386 return -EAGAIN;
387
388 debug("...got it;\n");
Rong Chang8faa9452013-04-12 10:44:57 +0000389
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000390 /* Read first 10 bytes, including tag, paramsize, and result */
Simon Glasscd8cc672015-08-22 18:31:38 -0600391 size = tpm_tis_i2c_recv_data(dev, buf, TPM_HEADER_SIZE);
Rong Chang8faa9452013-04-12 10:44:57 +0000392 if (size < TPM_HEADER_SIZE) {
Simon Glasscd8cc672015-08-22 18:31:38 -0600393 debug("Unable to read header\n");
394 return size < 0 ? size : -EIO;
Rong Chang8faa9452013-04-12 10:44:57 +0000395 }
396
397 expected = get_unaligned_be32(buf + TPM_RSP_SIZE_BYTE);
Jeremy Boone4dc0eca2018-02-12 17:56:36 -0500398 if ((size_t)expected > count || (size_t)expected < TPM_HEADER_SIZE) {
Simon Glasscd8cc672015-08-22 18:31:38 -0600399 debug("Error size=%x, expected=%x, count=%x\n", size, expected,
Simon Glassc9a3e842015-05-04 11:30:59 -0600400 count);
Simon Glasscd8cc672015-08-22 18:31:38 -0600401 return -ENOSPC;
Rong Chang8faa9452013-04-12 10:44:57 +0000402 }
403
Simon Glasscd8cc672015-08-22 18:31:38 -0600404 size += tpm_tis_i2c_recv_data(dev, &buf[TPM_HEADER_SIZE],
Simon Glass7ccebaf2015-08-22 18:31:29 -0600405 expected - TPM_HEADER_SIZE);
Rong Chang8faa9452013-04-12 10:44:57 +0000406 if (size < expected) {
Simon Glasscd8cc672015-08-22 18:31:38 -0600407 debug("Unable to read remainder of result\n");
408 return -ETIMEDOUT;
Rong Chang8faa9452013-04-12 10:44:57 +0000409 }
410
Simon Glasscd8cc672015-08-22 18:31:38 -0600411 rc = tpm_tis_i2c_wait_for_stat(dev, TPM_STS_VALID, chip->timeout_c,
412 &status);
413 if (rc)
414 return rc;
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000415 if (status & TPM_STS_DATA_AVAIL) { /* Retry? */
Simon Glasscd8cc672015-08-22 18:31:38 -0600416 debug("Error left over data\n");
417 return -EIO;
Rong Chang8faa9452013-04-12 10:44:57 +0000418 }
419
Rong Chang8faa9452013-04-12 10:44:57 +0000420 return size;
421}
422
Simon Glasscd8cc672015-08-22 18:31:38 -0600423static int tpm_tis_i2c_send(struct udevice *dev, const u8 *buf, size_t len)
Rong Chang8faa9452013-04-12 10:44:57 +0000424{
Simon Glasscd8cc672015-08-22 18:31:38 -0600425 struct tpm_chip *chip = dev_get_priv(dev);
Rong Chang8faa9452013-04-12 10:44:57 +0000426 int rc, status;
Simon Glassc9a3e842015-05-04 11:30:59 -0600427 size_t burstcnt;
Rong Chang8faa9452013-04-12 10:44:57 +0000428 size_t count = 0;
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000429 int retry = 0;
Rong Chang8faa9452013-04-12 10:44:57 +0000430 u8 sts = TPM_STS_GO;
431
Simon Glassc9a3e842015-05-04 11:30:59 -0600432 debug("%s: len=%d\n", __func__, len);
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000433 if (len > TPM_DEV_BUFSIZE)
434 return -E2BIG; /* Command is too long for our tpm, sorry */
Rong Chang8faa9452013-04-12 10:44:57 +0000435
Simon Glasscd8cc672015-08-22 18:31:38 -0600436 if (tpm_tis_i2c_request_locality(dev, 0) < 0)
Rong Chang8faa9452013-04-12 10:44:57 +0000437 return -EBUSY;
438
Simon Glasscd8cc672015-08-22 18:31:38 -0600439 status = tpm_tis_i2c_status(dev);
Rong Chang8faa9452013-04-12 10:44:57 +0000440 if ((status & TPM_STS_COMMAND_READY) == 0) {
Simon Glasscd8cc672015-08-22 18:31:38 -0600441 rc = tpm_tis_i2c_ready(dev);
442 if (rc)
443 return rc;
444 rc = tpm_tis_i2c_wait_for_stat(dev, TPM_STS_COMMAND_READY,
445 chip->timeout_b, &status);
446 if (rc)
447 return rc;
Rong Chang8faa9452013-04-12 10:44:57 +0000448 }
449
Simon Glasscd8cc672015-08-22 18:31:38 -0600450 burstcnt = tpm_tis_i2c_get_burstcount(dev);
Rong Chang8faa9452013-04-12 10:44:57 +0000451
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000452 /* burstcount < 0 -> tpm is busy */
453 if (burstcnt < 0)
454 return burstcnt;
Rong Chang8faa9452013-04-12 10:44:57 +0000455
Simon Glassc9a3e842015-05-04 11:30:59 -0600456 while (count < len) {
457 udelay(300);
458 if (burstcnt > len - count)
459 burstcnt = len - count;
Rong Chang8faa9452013-04-12 10:44:57 +0000460
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000461#ifdef CONFIG_TPM_TIS_I2C_BURST_LIMITATION
Simon Glasscd8cc672015-08-22 18:31:38 -0600462 if (retry && burstcnt > CONFIG_TPM_TIS_I2C_BURST_LIMITATION_LEN)
463 burstcnt = CONFIG_TPM_TIS_I2C_BURST_LIMITATION_LEN;
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000464#endif /* CONFIG_TPM_TIS_I2C_BURST_LIMITATION */
Rong Chang8faa9452013-04-12 10:44:57 +0000465
Ilias Apalodimas228c57c2021-11-09 09:02:15 +0200466 rc = tpm_tis_i2c_write(dev, TPM_INFINEON_DATA_FIFO(chip->locality),
Simon Glasscd8cc672015-08-22 18:31:38 -0600467 &(buf[count]), burstcnt);
Rong Chang8faa9452013-04-12 10:44:57 +0000468 if (rc == 0)
469 count += burstcnt;
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000470 else {
Simon Glassc9a3e842015-05-04 11:30:59 -0600471 debug("%s: error\n", __func__);
Simon Glasscd8cc672015-08-22 18:31:38 -0600472 if (retry++ > 10)
473 return -EIO;
474 rc = tpm_tis_i2c_wait_for_stat(dev, TPM_STS_VALID,
Simon Glass7ccebaf2015-08-22 18:31:29 -0600475 chip->timeout_c,
476 &status);
Simon Glassc9a3e842015-05-04 11:30:59 -0600477 if (rc)
Simon Glasscd8cc672015-08-22 18:31:38 -0600478 return rc;
Rong Chang8faa9452013-04-12 10:44:57 +0000479
Simon Glasscd8cc672015-08-22 18:31:38 -0600480 if ((status & TPM_STS_DATA_EXPECT) == 0)
481 return -EIO;
Rong Chang8faa9452013-04-12 10:44:57 +0000482 }
483 }
484
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000485 /* Go and do it */
Ilias Apalodimas228c57c2021-11-09 09:02:15 +0200486 rc = tpm_tis_i2c_write(dev, TPM_INFINEON_STS(chip->locality), &sts, 1);
Simon Glasscd8cc672015-08-22 18:31:38 -0600487 if (rc < 0)
488 return rc;
489 debug("%s: done, rc=%d\n", __func__, rc);
Rong Chang8faa9452013-04-12 10:44:57 +0000490
491 return len;
Simon Glasscd8cc672015-08-22 18:31:38 -0600492}
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000493
Simon Glasscd8cc672015-08-22 18:31:38 -0600494static int tpm_tis_i2c_cleanup(struct udevice *dev)
495{
496 struct tpm_chip *chip = dev_get_priv(dev);
497
498 tpm_tis_i2c_ready(dev);
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000499 /*
500 * The TPM needs some time to clean up here,
Rong Chang8faa9452013-04-12 10:44:57 +0000501 * so we sleep rather than keeping the bus busy
502 */
Simon Glassa57bcee2015-08-22 18:31:30 -0600503 mdelay(2);
Simon Glasscd8cc672015-08-22 18:31:38 -0600504 tpm_tis_i2c_release_locality(dev, chip->locality, 0);
Vincent Palatin06883eb2013-04-12 11:04:36 +0000505
Simon Glasscd8cc672015-08-22 18:31:38 -0600506 return 0;
Vincent Palatin06883eb2013-04-12 11:04:36 +0000507}
508
Simon Glass1de4d582015-08-22 18:31:25 -0600509static int tpm_tis_i2c_init(struct udevice *dev)
Rong Chang8faa9452013-04-12 10:44:57 +0000510{
Simon Glasscd8cc672015-08-22 18:31:38 -0600511 struct tpm_chip *chip = dev_get_priv(dev);
Rong Chang8faa9452013-04-12 10:44:57 +0000512 u32 vendor;
Vincent Palatin06883eb2013-04-12 11:04:36 +0000513 u32 expected_did_vid;
Simon Glasscd8cc672015-08-22 18:31:38 -0600514 int rc;
Rong Chang8faa9452013-04-12 10:44:57 +0000515
Simon Glassab79b002015-08-22 18:31:24 -0600516 chip->is_open = 1;
Rong Chang8faa9452013-04-12 10:44:57 +0000517
Simon Glass7ccebaf2015-08-22 18:31:29 -0600518 /* Default timeouts - these could move to the device tree */
Simon Glassa57bcee2015-08-22 18:31:30 -0600519 chip->timeout_a = TIS_SHORT_TIMEOUT_MS;
520 chip->timeout_b = TIS_LONG_TIMEOUT_MS;
521 chip->timeout_c = TIS_SHORT_TIMEOUT_MS;
522 chip->timeout_d = TIS_SHORT_TIMEOUT_MS;
Rong Chang8faa9452013-04-12 10:44:57 +0000523
Simon Glasscd8cc672015-08-22 18:31:38 -0600524 rc = tpm_tis_i2c_request_locality(dev, 0);
525 if (rc < 0)
526 return rc;
Rong Chang8faa9452013-04-12 10:44:57 +0000527
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000528 /* Read four bytes from DID_VID register */
Ilias Apalodimas228c57c2021-11-09 09:02:15 +0200529 if (tpm_tis_i2c_read(dev, TPM_INFINEON_DID_VID(0), (uchar *)&vendor, 4) < 0) {
Simon Glasscd8cc672015-08-22 18:31:38 -0600530 tpm_tis_i2c_release_locality(dev, 0, 1);
Simon Glassc9a3e842015-05-04 11:30:59 -0600531 return -EIO;
Rong Chang8faa9452013-04-12 10:44:57 +0000532 }
533
Simon Glasscd8cc672015-08-22 18:31:38 -0600534 if (chip->chip_type == SLB9635) {
Vincent Palatin06883eb2013-04-12 11:04:36 +0000535 vendor = be32_to_cpu(vendor);
536 expected_did_vid = TPM_TIS_I2C_DID_VID_9635;
537 } else {
538 /* device id and byte order has changed for newer i2c tpms */
539 expected_did_vid = TPM_TIS_I2C_DID_VID_9645;
540 }
Rong Chang8faa9452013-04-12 10:44:57 +0000541
Simon Glasscd8cc672015-08-22 18:31:38 -0600542 if (chip->chip_type != UNKNOWN && vendor != expected_did_vid) {
Masahiro Yamada81e10422017-09-16 14:10:41 +0900543 pr_err("Vendor id did not match! ID was %08x\n", vendor);
Simon Glassc9a3e842015-05-04 11:30:59 -0600544 return -ENODEV;
Rong Chang8faa9452013-04-12 10:44:57 +0000545 }
546
Simon Glasscd8cc672015-08-22 18:31:38 -0600547 chip->vend_dev = vendor;
Tom Wai-Hong Tame49fed52013-04-12 11:04:37 +0000548 debug("1.2 TPM (chip type %s device-id 0x%X)\n",
Simon Glasscd8cc672015-08-22 18:31:38 -0600549 chip_name[chip->chip_type], vendor >> 16);
Rong Chang8faa9452013-04-12 10:44:57 +0000550
551 /*
552 * A timeout query to TPM can be placed here.
553 * Standard timeout values are used so far
554 */
555
556 return 0;
Simon Glassc9a3e842015-05-04 11:30:59 -0600557}
Rong Chang8faa9452013-04-12 10:44:57 +0000558
Simon Glasscd8cc672015-08-22 18:31:38 -0600559static int tpm_tis_i2c_open(struct udevice *dev)
Simon Glass94576272015-08-22 18:31:22 -0600560{
Simon Glasscd8cc672015-08-22 18:31:38 -0600561 struct tpm_chip *chip = dev_get_priv(dev);
Simon Glass94576272015-08-22 18:31:22 -0600562 int rc;
Simon Glass94576272015-08-22 18:31:22 -0600563
Simon Glasscd8cc672015-08-22 18:31:38 -0600564 debug("%s: start\n", __func__);
565 if (chip->is_open)
566 return -EBUSY;
567 rc = tpm_tis_i2c_init(dev);
Simon Glass94576272015-08-22 18:31:22 -0600568 if (rc < 0)
Simon Glasscd8cc672015-08-22 18:31:38 -0600569 chip->is_open = 0;
Simon Glass94576272015-08-22 18:31:22 -0600570
Simon Glass94576272015-08-22 18:31:22 -0600571 return rc;
572}
573
Simon Glasscd8cc672015-08-22 18:31:38 -0600574static int tpm_tis_i2c_close(struct udevice *dev)
Simon Glass94576272015-08-22 18:31:22 -0600575{
Simon Glasscd8cc672015-08-22 18:31:38 -0600576 struct tpm_chip *chip = dev_get_priv(dev);
Simon Glass94576272015-08-22 18:31:22 -0600577
Simon Glasscd8cc672015-08-22 18:31:38 -0600578 if (chip->is_open) {
579 tpm_tis_i2c_release_locality(dev, chip->locality, 1);
580 chip->is_open = 0;
581 chip->vend_dev = 0;
Simon Glass94576272015-08-22 18:31:22 -0600582 }
583
Simon Glass94576272015-08-22 18:31:22 -0600584 return 0;
585}
586
Ilias Apalodimas228c57c2021-11-09 09:02:15 +0200587static int tpm_tis_i2c_get_desc(struct udevice *dev, char *buf, int size)
Simon Glass94576272015-08-22 18:31:22 -0600588{
Simon Glasscd8cc672015-08-22 18:31:38 -0600589 struct tpm_chip *chip = dev_get_priv(dev);
Simon Glass94576272015-08-22 18:31:22 -0600590
Simon Glasscd8cc672015-08-22 18:31:38 -0600591 if (size < 50)
592 return -ENOSPC;
Simon Glass94576272015-08-22 18:31:22 -0600593
Simon Glasscd8cc672015-08-22 18:31:38 -0600594 return snprintf(buf, size, "1.2 TPM (%s, chip type %s device-id 0x%x)",
595 chip->is_open ? "open" : "closed",
596 chip_name[chip->chip_type],
597 chip->vend_dev >> 16);
Simon Glass94576272015-08-22 18:31:22 -0600598}
599
Simon Glasscd8cc672015-08-22 18:31:38 -0600600static int tpm_tis_i2c_probe(struct udevice *dev)
Simon Glass94576272015-08-22 18:31:22 -0600601{
Simon Glasscd8cc672015-08-22 18:31:38 -0600602 struct tpm_chip_priv *uc_priv = dev_get_uclass_priv(dev);
603 struct tpm_chip *chip = dev_get_priv(dev);
Simon Glass94576272015-08-22 18:31:22 -0600604
Simon Glasscd8cc672015-08-22 18:31:38 -0600605 chip->chip_type = dev_get_driver_data(dev);
Simon Glass94576272015-08-22 18:31:22 -0600606
Simon Glasscd8cc672015-08-22 18:31:38 -0600607 /* TODO: These need to be checked and tuned */
608 uc_priv->duration_ms[TPM_SHORT] = TIS_SHORT_TIMEOUT_MS;
609 uc_priv->duration_ms[TPM_MEDIUM] = TIS_LONG_TIMEOUT_MS;
610 uc_priv->duration_ms[TPM_LONG] = TIS_LONG_TIMEOUT_MS;
611 uc_priv->retry_time_ms = TPM_TIMEOUT_MS;
Simon Glass94576272015-08-22 18:31:22 -0600612
613 return 0;
614}
615
Simon Glasscd8cc672015-08-22 18:31:38 -0600616static const struct tpm_ops tpm_tis_i2c_ops = {
617 .open = tpm_tis_i2c_open,
618 .close = tpm_tis_i2c_close,
Ilias Apalodimas228c57c2021-11-09 09:02:15 +0200619 .get_desc = tpm_tis_i2c_get_desc,
Simon Glasscd8cc672015-08-22 18:31:38 -0600620 .send = tpm_tis_i2c_send,
621 .recv = tpm_tis_i2c_recv,
622 .cleanup = tpm_tis_i2c_cleanup,
623};
Simon Glass94576272015-08-22 18:31:22 -0600624
Simon Glasscd8cc672015-08-22 18:31:38 -0600625static const struct udevice_id tpm_tis_i2c_ids[] = {
626 { .compatible = "infineon,slb9635tt", .data = SLB9635 },
627 { .compatible = "infineon,slb9645tt", .data = SLB9645 },
628 { }
629};
Simon Glass94576272015-08-22 18:31:22 -0600630
Simon Glasscd8cc672015-08-22 18:31:38 -0600631U_BOOT_DRIVER(tpm_tis_i2c) = {
Christophe Ricard8759ff82015-10-06 22:54:41 +0200632 .name = "tpm_tis_infineon",
Simon Glasscd8cc672015-08-22 18:31:38 -0600633 .id = UCLASS_TPM,
634 .of_match = tpm_tis_i2c_ids,
635 .ops = &tpm_tis_i2c_ops,
636 .probe = tpm_tis_i2c_probe,
Simon Glass8a2b47f2020-12-03 16:55:17 -0700637 .priv_auto = sizeof(struct tpm_chip),
Simon Glasscd8cc672015-08-22 18:31:38 -0600638};