1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2015 Zodiac Inflight Innovations 4 * 5 * Author: Martyn Welch <martyn.welch@collabora.co.uk> 6 * 7 * Based on twl4030_wdt.c by Timo Kokkonen <timo.t.kokkonen at nokia.com>: 8 * 9 * Copyright (C) Nokia Corporation 10 */ 11 12 #include <linux/delay.h> 13 #include <linux/i2c.h> 14 #include <linux/ihex.h> 15 #include <linux/firmware.h> 16 #include <linux/kernel.h> 17 #include <linux/module.h> 18 #include <linux/slab.h> 19 #include <linux/sysfs.h> 20 #include <linux/types.h> 21 #include <linux/watchdog.h> 22 23 #include <asm/unaligned.h> 24 25 #define ZIIRAVE_TIMEOUT_MIN 3 26 #define ZIIRAVE_TIMEOUT_MAX 255 27 #define ZIIRAVE_TIMEOUT_DEFAULT 30 28 29 #define ZIIRAVE_PING_VALUE 0x0 30 31 #define ZIIRAVE_STATE_INITIAL 0x0 32 #define ZIIRAVE_STATE_OFF 0x1 33 #define ZIIRAVE_STATE_ON 0x2 34 35 #define ZIIRAVE_FW_NAME "ziirave_wdt.fw" 36 37 static char *ziirave_reasons[] = {"power cycle", "hw watchdog", NULL, NULL, 38 "host request", NULL, "illegal configuration", 39 "illegal instruction", "illegal trap", 40 "unknown"}; 41 42 #define ZIIRAVE_WDT_FIRM_VER_MAJOR 0x1 43 #define ZIIRAVE_WDT_BOOT_VER_MAJOR 0x3 44 #define ZIIRAVE_WDT_RESET_REASON 0x5 45 #define ZIIRAVE_WDT_STATE 0x6 46 #define ZIIRAVE_WDT_TIMEOUT 0x7 47 #define ZIIRAVE_WDT_TIME_LEFT 0x8 48 #define ZIIRAVE_WDT_PING 0x9 49 #define ZIIRAVE_WDT_RESET_DURATION 0xa 50 51 #define ZIIRAVE_FIRM_PKT_TOTAL_SIZE 20 52 #define ZIIRAVE_FIRM_PKT_DATA_SIZE 16 53 #define ZIIRAVE_FIRM_FLASH_MEMORY_START (2 * 0x1600) 54 #define ZIIRAVE_FIRM_FLASH_MEMORY_END (2 * 0x2bbf) 55 #define ZIIRAVE_FIRM_PAGE_SIZE 128 56 57 /* Received and ready for next Download packet. */ 58 #define ZIIRAVE_FIRM_DOWNLOAD_ACK 1 59 60 /* Firmware commands */ 61 #define ZIIRAVE_CMD_DOWNLOAD_START 0x10 62 #define ZIIRAVE_CMD_DOWNLOAD_END 0x11 63 #define ZIIRAVE_CMD_DOWNLOAD_SET_READ_ADDR 0x12 64 #define ZIIRAVE_CMD_DOWNLOAD_READ_BYTE 0x13 65 #define ZIIRAVE_CMD_RESET_PROCESSOR 0x0b 66 #define ZIIRAVE_CMD_JUMP_TO_BOOTLOADER 0x0c 67 #define ZIIRAVE_CMD_DOWNLOAD_PACKET 0x0e 68 69 #define ZIIRAVE_CMD_JUMP_TO_BOOTLOADER_MAGIC 1 70 #define ZIIRAVE_CMD_RESET_PROCESSOR_MAGIC 1 71 72 #define ZIIRAVE_FW_VERSION_FMT "02.%02u.%02u" 73 #define ZIIRAVE_BL_VERSION_FMT "01.%02u.%02u" 74 75 struct ziirave_wdt_rev { 76 unsigned char major; 77 unsigned char minor; 78 }; 79 80 struct ziirave_wdt_data { 81 struct mutex sysfs_mutex; 82 struct watchdog_device wdd; 83 struct ziirave_wdt_rev bootloader_rev; 84 struct ziirave_wdt_rev firmware_rev; 85 int reset_reason; 86 }; 87 88 static int wdt_timeout; 89 module_param(wdt_timeout, int, 0); 90 MODULE_PARM_DESC(wdt_timeout, "Watchdog timeout in seconds"); 91 92 static int reset_duration; 93 module_param(reset_duration, int, 0); 94 MODULE_PARM_DESC(reset_duration, 95 "Watchdog reset pulse duration in milliseconds"); 96 97 static bool nowayout = WATCHDOG_NOWAYOUT; 98 module_param(nowayout, bool, 0); 99 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started default=" 100 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); 101 102 static int ziirave_wdt_revision(struct i2c_client *client, 103 struct ziirave_wdt_rev *rev, u8 command) 104 { 105 int ret; 106 107 ret = i2c_smbus_read_byte_data(client, command); 108 if (ret < 0) 109 return ret; 110 111 rev->major = ret; 112 113 ret = i2c_smbus_read_byte_data(client, command + 1); 114 if (ret < 0) 115 return ret; 116 117 rev->minor = ret; 118 119 return 0; 120 } 121 122 static int ziirave_wdt_set_state(struct watchdog_device *wdd, int state) 123 { 124 struct i2c_client *client = to_i2c_client(wdd->parent); 125 126 return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_STATE, state); 127 } 128 129 static int ziirave_wdt_start(struct watchdog_device *wdd) 130 { 131 return ziirave_wdt_set_state(wdd, ZIIRAVE_STATE_ON); 132 } 133 134 static int ziirave_wdt_stop(struct watchdog_device *wdd) 135 { 136 return ziirave_wdt_set_state(wdd, ZIIRAVE_STATE_OFF); 137 } 138 139 static int ziirave_wdt_ping(struct watchdog_device *wdd) 140 { 141 struct i2c_client *client = to_i2c_client(wdd->parent); 142 143 return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_PING, 144 ZIIRAVE_PING_VALUE); 145 } 146 147 static int ziirave_wdt_set_timeout(struct watchdog_device *wdd, 148 unsigned int timeout) 149 { 150 struct i2c_client *client = to_i2c_client(wdd->parent); 151 int ret; 152 153 ret = i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_TIMEOUT, timeout); 154 if (!ret) 155 wdd->timeout = timeout; 156 157 return ret; 158 } 159 160 static unsigned int ziirave_wdt_get_timeleft(struct watchdog_device *wdd) 161 { 162 struct i2c_client *client = to_i2c_client(wdd->parent); 163 int ret; 164 165 ret = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_TIME_LEFT); 166 if (ret < 0) 167 ret = 0; 168 169 return ret; 170 } 171 172 static int ziirave_firm_read_ack(struct watchdog_device *wdd) 173 { 174 struct i2c_client *client = to_i2c_client(wdd->parent); 175 int ret; 176 177 ret = i2c_smbus_read_byte(client); 178 if (ret < 0) { 179 dev_err(&client->dev, "Failed to read status byte\n"); 180 return ret; 181 } 182 183 return ret == ZIIRAVE_FIRM_DOWNLOAD_ACK ? 0 : -EIO; 184 } 185 186 static int ziirave_firm_set_read_addr(struct watchdog_device *wdd, u32 addr) 187 { 188 struct i2c_client *client = to_i2c_client(wdd->parent); 189 const u16 addr16 = (u16)addr / 2; 190 u8 address[2]; 191 192 put_unaligned_le16(addr16, address); 193 194 return i2c_smbus_write_block_data(client, 195 ZIIRAVE_CMD_DOWNLOAD_SET_READ_ADDR, 196 sizeof(address), address); 197 } 198 199 static bool ziirave_firm_addr_readonly(u32 addr) 200 { 201 return addr < ZIIRAVE_FIRM_FLASH_MEMORY_START || 202 addr > ZIIRAVE_FIRM_FLASH_MEMORY_END; 203 } 204 205 /* 206 * ziirave_firm_write_pkt() - Build and write a firmware packet 207 * 208 * A packet to send to the firmware is composed by following bytes: 209 * Length | Addr0 | Addr1 | Data0 .. Data15 | Checksum | 210 * Where, 211 * Length: A data byte containing the length of the data. 212 * Addr0: Low byte of the address. 213 * Addr1: High byte of the address. 214 * Data0 .. Data15: Array of 16 bytes of data. 215 * Checksum: Checksum byte to verify data integrity. 216 */ 217 static int __ziirave_firm_write_pkt(struct watchdog_device *wdd, 218 u32 addr, const u8 *data, u8 len) 219 { 220 const u16 addr16 = (u16)addr / 2; 221 struct i2c_client *client = to_i2c_client(wdd->parent); 222 u8 i, checksum = 0, packet[ZIIRAVE_FIRM_PKT_TOTAL_SIZE]; 223 int ret; 224 225 /* Check max data size */ 226 if (len > ZIIRAVE_FIRM_PKT_DATA_SIZE) { 227 dev_err(&client->dev, "Firmware packet too long (%d)\n", 228 len); 229 return -EMSGSIZE; 230 } 231 232 /* 233 * Ignore packets that are targeting program memory outisde of 234 * app partition, since they will be ignored by the 235 * bootloader. At the same time, we need to make sure we'll 236 * allow zero length packet that will be sent as the last step 237 * of firmware update 238 */ 239 if (len && ziirave_firm_addr_readonly(addr)) 240 return 0; 241 242 /* Packet length */ 243 packet[0] = len; 244 /* Packet address */ 245 put_unaligned_le16(addr16, packet + 1); 246 247 memcpy(packet + 3, data, len); 248 memset(packet + 3 + len, 0, ZIIRAVE_FIRM_PKT_DATA_SIZE - len); 249 250 /* Packet checksum */ 251 for (i = 0; i < len + 3; i++) 252 checksum += packet[i]; 253 packet[ZIIRAVE_FIRM_PKT_TOTAL_SIZE - 1] = checksum; 254 255 ret = i2c_smbus_write_block_data(client, ZIIRAVE_CMD_DOWNLOAD_PACKET, 256 sizeof(packet), packet); 257 if (ret) { 258 dev_err(&client->dev, 259 "Failed to send DOWNLOAD_PACKET: %d\n", ret); 260 return ret; 261 } 262 263 ret = ziirave_firm_read_ack(wdd); 264 if (ret) 265 dev_err(&client->dev, 266 "Failed to write firmware packet at address 0x%04x: %d\n", 267 addr, ret); 268 269 return ret; 270 } 271 272 static int ziirave_firm_write_pkt(struct watchdog_device *wdd, 273 u32 addr, const u8 *data, u8 len) 274 { 275 const u8 max_write_len = ZIIRAVE_FIRM_PAGE_SIZE - 276 (addr - ALIGN_DOWN(addr, ZIIRAVE_FIRM_PAGE_SIZE)); 277 int ret; 278 279 if (len > max_write_len) { 280 /* 281 * If data crossed page boundary we need to split this 282 * write in two 283 */ 284 ret = __ziirave_firm_write_pkt(wdd, addr, data, max_write_len); 285 if (ret) 286 return ret; 287 288 addr += max_write_len; 289 data += max_write_len; 290 len -= max_write_len; 291 } 292 293 return __ziirave_firm_write_pkt(wdd, addr, data, len); 294 } 295 296 static int ziirave_firm_verify(struct watchdog_device *wdd, 297 const struct firmware *fw) 298 { 299 struct i2c_client *client = to_i2c_client(wdd->parent); 300 const struct ihex_binrec *rec; 301 int i, ret; 302 u8 data[ZIIRAVE_FIRM_PKT_DATA_SIZE]; 303 304 for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) { 305 const u16 len = be16_to_cpu(rec->len); 306 const u32 addr = be32_to_cpu(rec->addr); 307 308 if (ziirave_firm_addr_readonly(addr)) 309 continue; 310 311 ret = ziirave_firm_set_read_addr(wdd, addr); 312 if (ret) { 313 dev_err(&client->dev, 314 "Failed to send SET_READ_ADDR command: %d\n", 315 ret); 316 return ret; 317 } 318 319 for (i = 0; i < len; i++) { 320 ret = i2c_smbus_read_byte_data(client, 321 ZIIRAVE_CMD_DOWNLOAD_READ_BYTE); 322 if (ret < 0) { 323 dev_err(&client->dev, 324 "Failed to READ DATA: %d\n", ret); 325 return ret; 326 } 327 data[i] = ret; 328 } 329 330 if (memcmp(data, rec->data, len)) { 331 dev_err(&client->dev, 332 "Firmware mismatch at address 0x%04x\n", addr); 333 return -EINVAL; 334 } 335 } 336 337 return 0; 338 } 339 340 static int ziirave_firm_upload(struct watchdog_device *wdd, 341 const struct firmware *fw) 342 { 343 struct i2c_client *client = to_i2c_client(wdd->parent); 344 const struct ihex_binrec *rec; 345 int ret; 346 347 ret = i2c_smbus_write_byte_data(client, 348 ZIIRAVE_CMD_JUMP_TO_BOOTLOADER, 349 ZIIRAVE_CMD_JUMP_TO_BOOTLOADER_MAGIC); 350 if (ret) { 351 dev_err(&client->dev, "Failed to jump to bootloader\n"); 352 return ret; 353 } 354 355 msleep(500); 356 357 ret = i2c_smbus_write_byte(client, ZIIRAVE_CMD_DOWNLOAD_START); 358 if (ret) { 359 dev_err(&client->dev, "Failed to start download\n"); 360 return ret; 361 } 362 363 ret = ziirave_firm_read_ack(wdd); 364 if (ret) { 365 dev_err(&client->dev, "No ACK for start download\n"); 366 return ret; 367 } 368 369 msleep(500); 370 371 for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) { 372 ret = ziirave_firm_write_pkt(wdd, be32_to_cpu(rec->addr), 373 rec->data, be16_to_cpu(rec->len)); 374 if (ret) 375 return ret; 376 } 377 378 /* 379 * Finish firmware download process by sending a zero length 380 * payload 381 */ 382 ret = ziirave_firm_write_pkt(wdd, 0, NULL, 0); 383 if (ret) { 384 dev_err(&client->dev, "Failed to send EMPTY packet: %d\n", ret); 385 return ret; 386 } 387 388 /* This sleep seems to be required */ 389 msleep(20); 390 391 /* Start firmware verification */ 392 ret = ziirave_firm_verify(wdd, fw); 393 if (ret) { 394 dev_err(&client->dev, 395 "Failed to verify firmware: %d\n", ret); 396 return ret; 397 } 398 399 /* End download operation */ 400 ret = i2c_smbus_write_byte(client, ZIIRAVE_CMD_DOWNLOAD_END); 401 if (ret) { 402 dev_err(&client->dev, 403 "Failed to end firmware download: %d\n", ret); 404 return ret; 405 } 406 407 /* Reset the processor */ 408 ret = i2c_smbus_write_byte_data(client, 409 ZIIRAVE_CMD_RESET_PROCESSOR, 410 ZIIRAVE_CMD_RESET_PROCESSOR_MAGIC); 411 if (ret) { 412 dev_err(&client->dev, 413 "Failed to reset the watchdog: %d\n", ret); 414 return ret; 415 } 416 417 msleep(500); 418 419 return 0; 420 } 421 422 static const struct watchdog_info ziirave_wdt_info = { 423 .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, 424 .identity = "RAVE Switch Watchdog", 425 }; 426 427 static const struct watchdog_ops ziirave_wdt_ops = { 428 .owner = THIS_MODULE, 429 .start = ziirave_wdt_start, 430 .stop = ziirave_wdt_stop, 431 .ping = ziirave_wdt_ping, 432 .set_timeout = ziirave_wdt_set_timeout, 433 .get_timeleft = ziirave_wdt_get_timeleft, 434 }; 435 436 static ssize_t ziirave_wdt_sysfs_show_firm(struct device *dev, 437 struct device_attribute *attr, 438 char *buf) 439 { 440 struct i2c_client *client = to_i2c_client(dev->parent); 441 struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client); 442 int ret; 443 444 ret = mutex_lock_interruptible(&w_priv->sysfs_mutex); 445 if (ret) 446 return ret; 447 448 ret = sprintf(buf, ZIIRAVE_FW_VERSION_FMT, w_priv->firmware_rev.major, 449 w_priv->firmware_rev.minor); 450 451 mutex_unlock(&w_priv->sysfs_mutex); 452 453 return ret; 454 } 455 456 static DEVICE_ATTR(firmware_version, S_IRUGO, ziirave_wdt_sysfs_show_firm, 457 NULL); 458 459 static ssize_t ziirave_wdt_sysfs_show_boot(struct device *dev, 460 struct device_attribute *attr, 461 char *buf) 462 { 463 struct i2c_client *client = to_i2c_client(dev->parent); 464 struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client); 465 int ret; 466 467 ret = mutex_lock_interruptible(&w_priv->sysfs_mutex); 468 if (ret) 469 return ret; 470 471 ret = sprintf(buf, ZIIRAVE_BL_VERSION_FMT, w_priv->bootloader_rev.major, 472 w_priv->bootloader_rev.minor); 473 474 mutex_unlock(&w_priv->sysfs_mutex); 475 476 return ret; 477 } 478 479 static DEVICE_ATTR(bootloader_version, S_IRUGO, ziirave_wdt_sysfs_show_boot, 480 NULL); 481 482 static ssize_t ziirave_wdt_sysfs_show_reason(struct device *dev, 483 struct device_attribute *attr, 484 char *buf) 485 { 486 struct i2c_client *client = to_i2c_client(dev->parent); 487 struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client); 488 int ret; 489 490 ret = mutex_lock_interruptible(&w_priv->sysfs_mutex); 491 if (ret) 492 return ret; 493 494 ret = sprintf(buf, "%s", ziirave_reasons[w_priv->reset_reason]); 495 496 mutex_unlock(&w_priv->sysfs_mutex); 497 498 return ret; 499 } 500 501 static DEVICE_ATTR(reset_reason, S_IRUGO, ziirave_wdt_sysfs_show_reason, 502 NULL); 503 504 static ssize_t ziirave_wdt_sysfs_store_firm(struct device *dev, 505 struct device_attribute *attr, 506 const char *buf, size_t count) 507 { 508 struct i2c_client *client = to_i2c_client(dev->parent); 509 struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client); 510 const struct firmware *fw; 511 int err; 512 513 err = request_ihex_firmware(&fw, ZIIRAVE_FW_NAME, dev); 514 if (err) { 515 dev_err(&client->dev, "Failed to request ihex firmware\n"); 516 return err; 517 } 518 519 err = mutex_lock_interruptible(&w_priv->sysfs_mutex); 520 if (err) 521 goto release_firmware; 522 523 err = ziirave_firm_upload(&w_priv->wdd, fw); 524 if (err) { 525 dev_err(&client->dev, "The firmware update failed: %d\n", err); 526 goto unlock_mutex; 527 } 528 529 /* Update firmware version */ 530 err = ziirave_wdt_revision(client, &w_priv->firmware_rev, 531 ZIIRAVE_WDT_FIRM_VER_MAJOR); 532 if (err) { 533 dev_err(&client->dev, "Failed to read firmware version: %d\n", 534 err); 535 goto unlock_mutex; 536 } 537 538 dev_info(&client->dev, 539 "Firmware updated to version " ZIIRAVE_FW_VERSION_FMT "\n", 540 w_priv->firmware_rev.major, w_priv->firmware_rev.minor); 541 542 /* Restore the watchdog timeout */ 543 err = ziirave_wdt_set_timeout(&w_priv->wdd, w_priv->wdd.timeout); 544 if (err) 545 dev_err(&client->dev, "Failed to set timeout: %d\n", err); 546 547 unlock_mutex: 548 mutex_unlock(&w_priv->sysfs_mutex); 549 550 release_firmware: 551 release_firmware(fw); 552 553 return err ? err : count; 554 } 555 556 static DEVICE_ATTR(update_firmware, S_IWUSR, NULL, 557 ziirave_wdt_sysfs_store_firm); 558 559 static struct attribute *ziirave_wdt_attrs[] = { 560 &dev_attr_firmware_version.attr, 561 &dev_attr_bootloader_version.attr, 562 &dev_attr_reset_reason.attr, 563 &dev_attr_update_firmware.attr, 564 NULL 565 }; 566 ATTRIBUTE_GROUPS(ziirave_wdt); 567 568 static int ziirave_wdt_init_duration(struct i2c_client *client) 569 { 570 int ret; 571 572 if (!reset_duration) { 573 /* See if the reset pulse duration is provided in an of_node */ 574 if (!client->dev.of_node) 575 ret = -ENODEV; 576 else 577 ret = of_property_read_u32(client->dev.of_node, 578 "reset-duration-ms", 579 &reset_duration); 580 if (ret) { 581 dev_info(&client->dev, 582 "No reset pulse duration specified, using default\n"); 583 return 0; 584 } 585 } 586 587 if (reset_duration < 1 || reset_duration > 255) 588 return -EINVAL; 589 590 dev_info(&client->dev, "Setting reset duration to %dms", 591 reset_duration); 592 593 return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_RESET_DURATION, 594 reset_duration); 595 } 596 597 static int ziirave_wdt_probe(struct i2c_client *client, 598 const struct i2c_device_id *id) 599 { 600 int ret; 601 struct ziirave_wdt_data *w_priv; 602 int val; 603 604 if (!i2c_check_functionality(client->adapter, 605 I2C_FUNC_SMBUS_BYTE | 606 I2C_FUNC_SMBUS_BYTE_DATA | 607 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)) 608 return -ENODEV; 609 610 w_priv = devm_kzalloc(&client->dev, sizeof(*w_priv), GFP_KERNEL); 611 if (!w_priv) 612 return -ENOMEM; 613 614 mutex_init(&w_priv->sysfs_mutex); 615 616 w_priv->wdd.info = &ziirave_wdt_info; 617 w_priv->wdd.ops = &ziirave_wdt_ops; 618 w_priv->wdd.min_timeout = ZIIRAVE_TIMEOUT_MIN; 619 w_priv->wdd.max_timeout = ZIIRAVE_TIMEOUT_MAX; 620 w_priv->wdd.parent = &client->dev; 621 w_priv->wdd.groups = ziirave_wdt_groups; 622 623 watchdog_init_timeout(&w_priv->wdd, wdt_timeout, &client->dev); 624 625 /* 626 * The default value set in the watchdog should be perfectly valid, so 627 * pass that in if we haven't provided one via the module parameter or 628 * of property. 629 */ 630 if (w_priv->wdd.timeout == 0) { 631 val = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_TIMEOUT); 632 if (val < 0) { 633 dev_err(&client->dev, "Failed to read timeout\n"); 634 return val; 635 } 636 637 if (val > ZIIRAVE_TIMEOUT_MAX || 638 val < ZIIRAVE_TIMEOUT_MIN) 639 val = ZIIRAVE_TIMEOUT_DEFAULT; 640 641 w_priv->wdd.timeout = val; 642 } 643 644 ret = ziirave_wdt_set_timeout(&w_priv->wdd, w_priv->wdd.timeout); 645 if (ret) { 646 dev_err(&client->dev, "Failed to set timeout\n"); 647 return ret; 648 } 649 650 dev_info(&client->dev, "Timeout set to %ds\n", w_priv->wdd.timeout); 651 652 watchdog_set_nowayout(&w_priv->wdd, nowayout); 653 654 i2c_set_clientdata(client, w_priv); 655 656 /* If in unconfigured state, set to stopped */ 657 val = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_STATE); 658 if (val < 0) { 659 dev_err(&client->dev, "Failed to read state\n"); 660 return val; 661 } 662 663 if (val == ZIIRAVE_STATE_INITIAL) 664 ziirave_wdt_stop(&w_priv->wdd); 665 666 ret = ziirave_wdt_init_duration(client); 667 if (ret) { 668 dev_err(&client->dev, "Failed to init duration\n"); 669 return ret; 670 } 671 672 ret = ziirave_wdt_revision(client, &w_priv->firmware_rev, 673 ZIIRAVE_WDT_FIRM_VER_MAJOR); 674 if (ret) { 675 dev_err(&client->dev, "Failed to read firmware version\n"); 676 return ret; 677 } 678 679 dev_info(&client->dev, 680 "Firmware version: " ZIIRAVE_FW_VERSION_FMT "\n", 681 w_priv->firmware_rev.major, w_priv->firmware_rev.minor); 682 683 ret = ziirave_wdt_revision(client, &w_priv->bootloader_rev, 684 ZIIRAVE_WDT_BOOT_VER_MAJOR); 685 if (ret) { 686 dev_err(&client->dev, "Failed to read bootloader version\n"); 687 return ret; 688 } 689 690 dev_info(&client->dev, 691 "Bootloader version: " ZIIRAVE_BL_VERSION_FMT "\n", 692 w_priv->bootloader_rev.major, w_priv->bootloader_rev.minor); 693 694 w_priv->reset_reason = i2c_smbus_read_byte_data(client, 695 ZIIRAVE_WDT_RESET_REASON); 696 if (w_priv->reset_reason < 0) { 697 dev_err(&client->dev, "Failed to read reset reason\n"); 698 return w_priv->reset_reason; 699 } 700 701 if (w_priv->reset_reason >= ARRAY_SIZE(ziirave_reasons) || 702 !ziirave_reasons[w_priv->reset_reason]) { 703 dev_err(&client->dev, "Invalid reset reason\n"); 704 return -ENODEV; 705 } 706 707 ret = watchdog_register_device(&w_priv->wdd); 708 709 return ret; 710 } 711 712 static int ziirave_wdt_remove(struct i2c_client *client) 713 { 714 struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client); 715 716 watchdog_unregister_device(&w_priv->wdd); 717 718 return 0; 719 } 720 721 static const struct i2c_device_id ziirave_wdt_id[] = { 722 { "rave-wdt", 0 }, 723 { } 724 }; 725 MODULE_DEVICE_TABLE(i2c, ziirave_wdt_id); 726 727 static const struct of_device_id zrv_wdt_of_match[] = { 728 { .compatible = "zii,rave-wdt", }, 729 { }, 730 }; 731 MODULE_DEVICE_TABLE(of, zrv_wdt_of_match); 732 733 static struct i2c_driver ziirave_wdt_driver = { 734 .driver = { 735 .name = "ziirave_wdt", 736 .of_match_table = zrv_wdt_of_match, 737 }, 738 .probe = ziirave_wdt_probe, 739 .remove = ziirave_wdt_remove, 740 .id_table = ziirave_wdt_id, 741 }; 742 743 module_i2c_driver(ziirave_wdt_driver); 744 745 MODULE_AUTHOR("Martyn Welch <martyn.welch@collabora.co.uk"); 746 MODULE_DESCRIPTION("Zodiac Aerospace RAVE Switch Watchdog Processor Driver"); 747 MODULE_LICENSE("GPL"); 748