Tom Rini | 83d290c | 2018-05-06 17:58:06 -0400 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
Christophe Ricard | 3aa7408 | 2016-01-21 23:27:13 +0100 | [diff] [blame] | 2 | /* |
| 3 | * STMicroelectronics TPM ST33ZP24 I2C UBOOT driver |
| 4 | * |
Patrice Chotard | 05cd119 | 2017-10-23 09:54:01 +0200 | [diff] [blame] | 5 | * Copyright (C) 2016, STMicroelectronics - All Rights Reserved |
| 6 | * Author(s): Christophe Ricard <christophe-h.ricard@st.com> for STMicroelectronics. |
Christophe Ricard | 3aa7408 | 2016-01-21 23:27:13 +0100 | [diff] [blame] | 7 | * |
| 8 | * Description: Device driver for ST33ZP24 I2C TPM TCG. |
| 9 | * |
| 10 | * This device driver implements the TPM interface as defined in |
| 11 | * the TCG TPM Interface Spec version 1.21, revision 1.0 and the |
| 12 | * STMicroelectronics Protocol Stack Specification version 1.2.0. |
Christophe Ricard | 3aa7408 | 2016-01-21 23:27:13 +0100 | [diff] [blame] | 13 | */ |
| 14 | |
| 15 | #include <common.h> |
| 16 | #include <dm.h> |
| 17 | #include <fdtdec.h> |
| 18 | #include <i2c.h> |
Simon Glass | f7ae49f | 2020-05-10 11:40:05 -0600 | [diff] [blame] | 19 | #include <log.h> |
Miquel Raynal | d677bfe | 2018-05-15 11:57:06 +0200 | [diff] [blame] | 20 | #include <tpm-v1.h> |
Christophe Ricard | 3aa7408 | 2016-01-21 23:27:13 +0100 | [diff] [blame] | 21 | #include <errno.h> |
Simon Glass | c05ed00 | 2020-05-10 11:40:11 -0600 | [diff] [blame] | 22 | #include <linux/delay.h> |
Christophe Ricard | 3aa7408 | 2016-01-21 23:27:13 +0100 | [diff] [blame] | 23 | #include <linux/types.h> |
| 24 | #include <asm/unaligned.h> |
| 25 | |
| 26 | #include "tpm_tis.h" |
| 27 | #include "tpm_internal.h" |
| 28 | |
| 29 | #define TPM_ACCESS 0x0 |
| 30 | #define TPM_STS 0x18 |
| 31 | #define TPM_DATA_FIFO 0x24 |
| 32 | |
| 33 | #define LOCALITY0 0 |
| 34 | |
| 35 | #define TPM_DUMMY_BYTE 0xAA |
| 36 | #define TPM_ST33ZP24_I2C_SLAVE_ADDR 0x13 |
| 37 | |
| 38 | #define TPM_WRITE_DIRECTION 0x80 |
| 39 | |
| 40 | /* |
| 41 | * st33zp24_i2c_write8_reg |
| 42 | * Send byte to the TIS register according to the ST33ZP24 I2C protocol. |
| 43 | * @param: tpm_register, the tpm tis register where the data should be written |
| 44 | * @param: tpm_data, the tpm_data to write inside the tpm_register |
| 45 | * @param: tpm_size, The length of the data |
| 46 | * @return: Number of byte written successfully else an error code. |
| 47 | */ |
| 48 | static int st33zp24_i2c_write8_reg(struct udevice *dev, u8 tpm_register, |
| 49 | const u8 *tpm_data, size_t tpm_size) |
| 50 | { |
| 51 | struct tpm_chip_priv *chip_priv = dev_get_uclass_priv(dev); |
| 52 | |
| 53 | chip_priv->buf[0] = tpm_register; |
| 54 | memcpy(chip_priv->buf + 1, tpm_data, tpm_size); |
| 55 | |
| 56 | return dm_i2c_write(dev, 0, chip_priv->buf, tpm_size + 1); |
| 57 | } |
| 58 | |
| 59 | /* |
| 60 | * st33zp24_i2c_read8_reg |
| 61 | * Recv byte from the TIS register according to the ST33ZP24 I2C protocol. |
| 62 | * @param: tpm_register, the tpm tis register where the data should be read |
| 63 | * @param: tpm_data, the TPM response |
| 64 | * @param: tpm_size, tpm TPM response size to read. |
| 65 | * @return: Number of byte read successfully else an error code. |
| 66 | */ |
| 67 | static int st33zp24_i2c_read8_reg(struct udevice *dev, u8 tpm_register, |
| 68 | u8 *tpm_data, size_t tpm_size) |
| 69 | { |
| 70 | int status; |
| 71 | u8 data; |
| 72 | |
| 73 | data = TPM_DUMMY_BYTE; |
| 74 | status = st33zp24_i2c_write8_reg(dev, tpm_register, &data, 1); |
| 75 | if (status < 0) |
| 76 | return status; |
| 77 | |
| 78 | return dm_i2c_read(dev, 0, tpm_data, tpm_size); |
| 79 | } |
| 80 | |
| 81 | /* |
| 82 | * st33zp24_i2c_write |
| 83 | * Send byte to the TIS register according to the ST33ZP24 I2C protocol. |
| 84 | * @param: phy_id, the phy description |
| 85 | * @param: tpm_register, the tpm tis register where the data should be written |
| 86 | * @param: tpm_data, the tpm_data to write inside the tpm_register |
| 87 | * @param: tpm_size, the length of the data |
| 88 | * @return: number of byte written successfully: should be one if success. |
| 89 | */ |
| 90 | static int st33zp24_i2c_write(struct udevice *dev, u8 tpm_register, |
| 91 | const u8 *tpm_data, size_t tpm_size) |
| 92 | { |
| 93 | return st33zp24_i2c_write8_reg(dev, tpm_register | TPM_WRITE_DIRECTION, |
| 94 | tpm_data, tpm_size); |
| 95 | } |
| 96 | |
| 97 | /* |
| 98 | * st33zp24_i2c_read |
| 99 | * Recv byte from the TIS register according to the ST33ZP24 I2C protocol. |
| 100 | * @param: phy_id, the phy description |
| 101 | * @param: tpm_register, the tpm tis register where the data should be read |
| 102 | * @param: tpm_data, the TPM response |
| 103 | * @param: tpm_size, tpm TPM response size to read. |
| 104 | * @return: number of byte read successfully: should be one if success. |
| 105 | */ |
| 106 | static int st33zp24_i2c_read(struct udevice *dev, u8 tpm_register, |
| 107 | u8 *tpm_data, size_t tpm_size) |
| 108 | { |
| 109 | return st33zp24_i2c_read8_reg(dev, tpm_register, tpm_data, tpm_size); |
| 110 | } |
| 111 | |
| 112 | /* |
| 113 | * st33zp24_i2c_release_locality release the active locality |
| 114 | * @param: chip, the tpm chip description. |
| 115 | */ |
| 116 | static void st33zp24_i2c_release_locality(struct udevice *dev) |
| 117 | { |
| 118 | u8 data = TPM_ACCESS_ACTIVE_LOCALITY; |
| 119 | |
| 120 | st33zp24_i2c_write(dev, TPM_ACCESS, &data, 1); |
| 121 | } |
| 122 | |
| 123 | /* |
| 124 | * st33zp24_i2c_check_locality if the locality is active |
| 125 | * @param: chip, the tpm chip description |
| 126 | * @return: the active locality or -EACCES. |
| 127 | */ |
| 128 | static int st33zp24_i2c_check_locality(struct udevice *dev) |
| 129 | { |
| 130 | struct tpm_chip *chip = dev_get_priv(dev); |
| 131 | u8 data; |
| 132 | u8 status; |
| 133 | |
| 134 | status = st33zp24_i2c_read(dev, TPM_ACCESS, &data, 1); |
| 135 | if (!status && (data & |
| 136 | (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) == |
| 137 | (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) |
| 138 | return chip->locality; |
| 139 | |
| 140 | return -EACCES; |
| 141 | } |
| 142 | |
| 143 | /* |
| 144 | * st33zp24_i2c_request_locality request the TPM locality |
| 145 | * @param: chip, the chip description |
| 146 | * @return: the active locality or negative value. |
| 147 | */ |
| 148 | static int st33zp24_i2c_request_locality(struct udevice *dev) |
| 149 | { |
| 150 | struct tpm_chip *chip = dev_get_priv(dev); |
| 151 | unsigned long start, stop; |
| 152 | long ret; |
| 153 | u8 data; |
| 154 | |
| 155 | if (st33zp24_i2c_check_locality(dev) == chip->locality) |
| 156 | return chip->locality; |
| 157 | |
| 158 | data = TPM_ACCESS_REQUEST_USE; |
| 159 | ret = st33zp24_i2c_write(dev, TPM_ACCESS, &data, 1); |
| 160 | if (ret < 0) |
| 161 | return ret; |
| 162 | |
| 163 | /* wait for locality activated */ |
| 164 | start = get_timer(0); |
| 165 | stop = chip->timeout_a; |
| 166 | do { |
| 167 | if (st33zp24_i2c_check_locality(dev) >= 0) |
| 168 | return chip->locality; |
| 169 | udelay(TPM_TIMEOUT_MS * 1000); |
| 170 | } while (get_timer(start) < stop); |
| 171 | |
| 172 | return -EACCES; |
| 173 | } |
| 174 | |
| 175 | /* |
| 176 | * st33zp24_i2c_status return the TPM_STS register |
| 177 | * @param: chip, the tpm chip description |
| 178 | * @return: the TPM_STS register value. |
| 179 | */ |
| 180 | static u8 st33zp24_i2c_status(struct udevice *dev) |
| 181 | { |
| 182 | u8 data; |
| 183 | |
| 184 | st33zp24_i2c_read(dev, TPM_STS, &data, 1); |
| 185 | |
| 186 | return data; |
| 187 | } |
| 188 | |
| 189 | /* |
| 190 | * st33zp24_i2c_get_burstcount return the burstcount address 0x19 0x1A |
| 191 | * @param: chip, the chip description |
| 192 | * return: the burstcount or -TPM_DRIVER_ERR in case of error. |
| 193 | */ |
| 194 | static int st33zp24_i2c_get_burstcount(struct udevice *dev) |
| 195 | { |
| 196 | struct tpm_chip *chip = dev_get_priv(dev); |
| 197 | unsigned long start, stop; |
| 198 | int burstcnt, status; |
| 199 | u8 tpm_reg, temp; |
| 200 | |
| 201 | /* wait for burstcount */ |
| 202 | start = get_timer(0); |
| 203 | stop = chip->timeout_d; |
| 204 | do { |
| 205 | tpm_reg = TPM_STS + 1; |
| 206 | status = st33zp24_i2c_read(dev, tpm_reg, &temp, 1); |
| 207 | if (status < 0) |
| 208 | return -EBUSY; |
| 209 | |
| 210 | tpm_reg = TPM_STS + 2; |
| 211 | burstcnt = temp; |
| 212 | status = st33zp24_i2c_read(dev, tpm_reg, &temp, 1); |
| 213 | if (status < 0) |
| 214 | return -EBUSY; |
| 215 | |
| 216 | burstcnt |= temp << 8; |
| 217 | if (burstcnt) |
| 218 | return burstcnt; |
| 219 | udelay(TIS_SHORT_TIMEOUT_MS * 1000); |
| 220 | } while (get_timer(start) < stop); |
| 221 | |
| 222 | return -EBUSY; |
| 223 | } |
| 224 | |
| 225 | /* |
| 226 | * st33zp24_i2c_cancel, cancel the current command execution or |
| 227 | * set STS to COMMAND READY. |
| 228 | * @param: chip, tpm_chip description. |
| 229 | */ |
| 230 | static void st33zp24_i2c_cancel(struct udevice *dev) |
| 231 | { |
| 232 | u8 data; |
| 233 | |
| 234 | data = TPM_STS_COMMAND_READY; |
| 235 | st33zp24_i2c_write(dev, TPM_STS, &data, 1); |
| 236 | } |
| 237 | |
| 238 | /* |
| 239 | * st33zp24_i2c_wait_for_stat wait for a TPM_STS value |
| 240 | * @param: chip, the tpm chip description |
| 241 | * @param: mask, the value mask to wait |
| 242 | * @param: timeout, the timeout |
| 243 | * @param: status, |
| 244 | * @return: the tpm status, 0 if success, -ETIME if timeout is reached. |
| 245 | */ |
| 246 | static int st33zp24_i2c_wait_for_stat(struct udevice *dev, u8 mask, |
| 247 | unsigned long timeout, int *status) |
| 248 | { |
| 249 | unsigned long start, stop; |
| 250 | |
| 251 | /* Check current status */ |
| 252 | *status = st33zp24_i2c_status(dev); |
| 253 | if ((*status & mask) == mask) |
| 254 | return 0; |
| 255 | |
| 256 | start = get_timer(0); |
| 257 | stop = timeout; |
| 258 | do { |
| 259 | udelay(TPM_TIMEOUT_MS * 1000); |
| 260 | *status = st33zp24_i2c_status(dev); |
| 261 | if ((*status & mask) == mask) |
| 262 | return 0; |
| 263 | } while (get_timer(start) < stop); |
| 264 | |
| 265 | return -ETIME; |
| 266 | } |
| 267 | |
| 268 | /* |
| 269 | * st33zp24_i2c_recv_data receive data |
| 270 | * @param: chip, the tpm chip description |
| 271 | * @param: buf, the buffer where the data are received |
| 272 | * @param: count, the number of data to receive |
| 273 | * @return: the number of bytes read from TPM FIFO. |
| 274 | */ |
| 275 | static int st33zp24_i2c_recv_data(struct udevice *dev, u8 *buf, size_t count) |
| 276 | { |
| 277 | struct tpm_chip *chip = dev_get_priv(dev); |
| 278 | int size = 0, burstcnt, len, ret, status; |
| 279 | |
| 280 | while (size < count && |
| 281 | st33zp24_i2c_wait_for_stat(dev, TPM_STS_DATA_AVAIL | TPM_STS_VALID, |
| 282 | chip->timeout_c, &status) == 0) { |
| 283 | burstcnt = st33zp24_i2c_get_burstcount(dev); |
| 284 | if (burstcnt < 0) |
| 285 | return burstcnt; |
| 286 | len = min_t(int, burstcnt, count - size); |
| 287 | ret = st33zp24_i2c_read(dev, TPM_DATA_FIFO, buf + size, len); |
| 288 | if (ret < 0) |
| 289 | return ret; |
| 290 | |
| 291 | size += len; |
| 292 | } |
| 293 | |
| 294 | return size; |
| 295 | } |
| 296 | |
| 297 | /* |
| 298 | * st33zp24_i2c_recv received TPM response through TPM phy. |
| 299 | * @param: chip, tpm_chip description. |
| 300 | * @param: buf, the buffer to store data. |
| 301 | * @param: count, the number of bytes that can received (sizeof buf). |
| 302 | * @return: Returns zero in case of success else -EIO. |
| 303 | */ |
| 304 | static int st33zp24_i2c_recv(struct udevice *dev, u8 *buf, size_t count) |
| 305 | { |
| 306 | struct tpm_chip *chip = dev_get_priv(dev); |
Jeremy Boone | 12e0ab3 | 2018-02-12 17:56:35 -0500 | [diff] [blame] | 307 | int size; |
| 308 | unsigned int expected; |
Christophe Ricard | 3aa7408 | 2016-01-21 23:27:13 +0100 | [diff] [blame] | 309 | |
| 310 | if (!chip) |
| 311 | return -ENODEV; |
| 312 | |
| 313 | if (count < TPM_HEADER_SIZE) { |
| 314 | size = -EIO; |
| 315 | goto out; |
| 316 | } |
| 317 | |
| 318 | size = st33zp24_i2c_recv_data(dev, buf, TPM_HEADER_SIZE); |
| 319 | if (size < TPM_HEADER_SIZE) { |
| 320 | debug("TPM error, unable to read header\n"); |
| 321 | goto out; |
| 322 | } |
| 323 | |
| 324 | expected = get_unaligned_be32(buf + 2); |
Jeremy Boone | 12e0ab3 | 2018-02-12 17:56:35 -0500 | [diff] [blame] | 325 | if (expected > count || expected < TPM_HEADER_SIZE) { |
Christophe Ricard | 3aa7408 | 2016-01-21 23:27:13 +0100 | [diff] [blame] | 326 | size = -EIO; |
| 327 | goto out; |
| 328 | } |
| 329 | |
| 330 | size += st33zp24_i2c_recv_data(dev, &buf[TPM_HEADER_SIZE], |
| 331 | expected - TPM_HEADER_SIZE); |
| 332 | if (size < expected) { |
| 333 | debug("TPM error, unable to read remaining bytes of result\n"); |
| 334 | size = -EIO; |
| 335 | goto out; |
| 336 | } |
| 337 | |
| 338 | out: |
| 339 | st33zp24_i2c_cancel(dev); |
| 340 | st33zp24_i2c_release_locality(dev); |
| 341 | |
| 342 | return size; |
| 343 | } |
| 344 | |
| 345 | /* |
| 346 | * st33zp24_i2c_send send TPM commands through TPM phy. |
| 347 | * @param: chip, tpm_chip description. |
| 348 | * @param: buf, the buffer to send. |
| 349 | * @param: len, the number of bytes to send. |
| 350 | * @return: Returns zero in case of success else the negative error code. |
| 351 | */ |
| 352 | static int st33zp24_i2c_send(struct udevice *dev, const u8 *buf, size_t len) |
| 353 | { |
| 354 | struct tpm_chip *chip = dev_get_priv(dev); |
| 355 | u32 i, size; |
| 356 | int burstcnt, ret, status; |
| 357 | u8 data, tpm_stat; |
| 358 | |
| 359 | if (!chip) |
| 360 | return -ENODEV; |
| 361 | if (len < TPM_HEADER_SIZE) |
| 362 | return -EIO; |
| 363 | |
| 364 | ret = st33zp24_i2c_request_locality(dev); |
| 365 | if (ret < 0) |
| 366 | return ret; |
| 367 | |
| 368 | tpm_stat = st33zp24_i2c_status(dev); |
| 369 | if ((tpm_stat & TPM_STS_COMMAND_READY) == 0) { |
| 370 | st33zp24_i2c_cancel(dev); |
| 371 | if (st33zp24_i2c_wait_for_stat(dev, TPM_STS_COMMAND_READY, |
| 372 | chip->timeout_b, &status) < 0) { |
| 373 | ret = -ETIME; |
| 374 | goto out_err; |
| 375 | } |
| 376 | } |
| 377 | |
| 378 | for (i = 0; i < len - 1;) { |
| 379 | burstcnt = st33zp24_i2c_get_burstcount(dev); |
| 380 | if (burstcnt < 0) |
| 381 | return burstcnt; |
| 382 | |
| 383 | size = min_t(int, len - i - 1, burstcnt); |
| 384 | ret = st33zp24_i2c_write(dev, TPM_DATA_FIFO, buf + i, size); |
| 385 | if (ret < 0) |
| 386 | goto out_err; |
| 387 | |
| 388 | i += size; |
| 389 | } |
| 390 | |
| 391 | tpm_stat = st33zp24_i2c_status(dev); |
| 392 | if ((tpm_stat & TPM_STS_DATA_EXPECT) == 0) { |
| 393 | ret = -EIO; |
| 394 | goto out_err; |
| 395 | } |
| 396 | |
| 397 | ret = st33zp24_i2c_write(dev, TPM_DATA_FIFO, buf + len - 1, 1); |
| 398 | if (ret < 0) |
| 399 | goto out_err; |
| 400 | |
| 401 | tpm_stat = st33zp24_i2c_status(dev); |
| 402 | if ((tpm_stat & TPM_STS_DATA_EXPECT) != 0) { |
| 403 | ret = -EIO; |
| 404 | goto out_err; |
| 405 | } |
| 406 | |
| 407 | data = TPM_STS_GO; |
| 408 | ret = st33zp24_i2c_write(dev, TPM_STS, &data, 1); |
| 409 | if (ret < 0) |
| 410 | goto out_err; |
| 411 | |
| 412 | return len; |
| 413 | |
| 414 | out_err: |
| 415 | st33zp24_i2c_cancel(dev); |
| 416 | st33zp24_i2c_release_locality(dev); |
| 417 | |
| 418 | return ret; |
| 419 | } |
| 420 | |
| 421 | static int st33zp24_i2c_cleanup(struct udevice *dev) |
| 422 | { |
| 423 | st33zp24_i2c_cancel(dev); |
| 424 | /* |
| 425 | * The TPM needs some time to clean up here, |
| 426 | * so we sleep rather than keeping the bus busy |
| 427 | */ |
| 428 | mdelay(2); |
| 429 | st33zp24_i2c_release_locality(dev); |
| 430 | |
| 431 | return 0; |
| 432 | } |
| 433 | |
| 434 | static int st33zp24_i2c_init(struct udevice *dev) |
| 435 | { |
| 436 | struct tpm_chip *chip = dev_get_priv(dev); |
| 437 | |
| 438 | chip->is_open = 1; |
| 439 | |
| 440 | /* Default timeouts - these could move to the device tree */ |
| 441 | chip->timeout_a = TIS_SHORT_TIMEOUT_MS; |
| 442 | chip->timeout_b = TIS_LONG_TIMEOUT_MS; |
| 443 | chip->timeout_c = TIS_SHORT_TIMEOUT_MS; |
| 444 | chip->timeout_d = TIS_SHORT_TIMEOUT_MS; |
| 445 | |
| 446 | chip->locality = LOCALITY0; |
| 447 | |
| 448 | /* |
| 449 | * A timeout query to TPM can be placed here. |
| 450 | * Standard timeout values are used so far |
| 451 | */ |
| 452 | |
| 453 | return 0; |
| 454 | } |
| 455 | |
| 456 | static int st33zp24_i2c_open(struct udevice *dev) |
| 457 | { |
| 458 | struct tpm_chip *chip = dev_get_priv(dev); |
| 459 | int rc; |
| 460 | |
| 461 | debug("%s: start\n", __func__); |
| 462 | if (chip->is_open) |
| 463 | return -EBUSY; |
| 464 | |
| 465 | rc = st33zp24_i2c_init(dev); |
| 466 | if (rc < 0) |
| 467 | chip->is_open = 0; |
| 468 | |
| 469 | return rc; |
| 470 | } |
| 471 | |
| 472 | static int st33zp24_i2c_close(struct udevice *dev) |
| 473 | { |
| 474 | struct tpm_chip *chip = dev_get_priv(dev); |
| 475 | |
| 476 | if (chip->is_open) { |
| 477 | st33zp24_i2c_release_locality(dev); |
| 478 | chip->is_open = 0; |
| 479 | chip->vend_dev = 0; |
| 480 | } |
| 481 | |
| 482 | return 0; |
| 483 | } |
| 484 | |
| 485 | static int st33zp24_i2c_get_desc(struct udevice *dev, char *buf, int size) |
| 486 | { |
| 487 | struct tpm_chip *chip = dev_get_priv(dev); |
| 488 | |
| 489 | if (size < 50) |
| 490 | return -ENOSPC; |
| 491 | |
| 492 | return snprintf(buf, size, "1.2 TPM (%s, chip type %s device-id 0x%x)", |
| 493 | chip->is_open ? "open" : "closed", |
| 494 | dev->name, |
| 495 | chip->vend_dev >> 16); |
| 496 | } |
| 497 | |
| 498 | static const struct tpm_ops st33zp24_i2c_tpm_ops = { |
| 499 | .open = st33zp24_i2c_open, |
| 500 | .close = st33zp24_i2c_close, |
| 501 | .recv = st33zp24_i2c_recv, |
| 502 | .send = st33zp24_i2c_send, |
| 503 | .cleanup = st33zp24_i2c_cleanup, |
| 504 | .get_desc = st33zp24_i2c_get_desc, |
| 505 | }; |
| 506 | |
| 507 | static int st33zp24_i2c_probe(struct udevice *dev) |
| 508 | { |
| 509 | struct tpm_chip *chip = dev_get_priv(dev); |
| 510 | |
| 511 | /* Default timeouts */ |
| 512 | chip->timeout_a = TIS_SHORT_TIMEOUT_MS; |
| 513 | chip->timeout_b = TIS_LONG_TIMEOUT_MS; |
| 514 | chip->timeout_c = TIS_SHORT_TIMEOUT_MS; |
| 515 | chip->timeout_d = TIS_SHORT_TIMEOUT_MS; |
| 516 | |
| 517 | chip->locality = LOCALITY0; |
| 518 | |
| 519 | i2c_set_chip_offset_len(dev, 0); |
| 520 | |
| 521 | debug("ST33ZP24 I2C TPM from STMicroelectronics found\n"); |
| 522 | |
| 523 | return 0; |
| 524 | } |
| 525 | |
| 526 | static int st33zp24_i2c_remove(struct udevice *dev) |
| 527 | { |
| 528 | st33zp24_i2c_release_locality(dev); |
| 529 | |
| 530 | return 0; |
| 531 | } |
| 532 | |
| 533 | static const struct udevice_id st33zp24_i2c_ids[] = { |
| 534 | { .compatible = "st,st33zp24-i2c" }, |
| 535 | { } |
| 536 | }; |
| 537 | |
| 538 | U_BOOT_DRIVER(st33zp24_i2c) = { |
| 539 | .name = "st33zp24-i2c", |
| 540 | .id = UCLASS_TPM, |
| 541 | .of_match = of_match_ptr(st33zp24_i2c_ids), |
| 542 | .probe = st33zp24_i2c_probe, |
| 543 | .remove = st33zp24_i2c_remove, |
| 544 | .ops = &st33zp24_i2c_tpm_ops, |
Simon Glass | 41575d8 | 2020-12-03 16:55:17 -0700 | [diff] [blame] | 545 | .priv_auto = sizeof(struct tpm_chip), |
Christophe Ricard | 3aa7408 | 2016-01-21 23:27:13 +0100 | [diff] [blame] | 546 | }; |