1 // SPDX-License-Identifier: GPL-2.0+ 2 3 /* 4 * Multifunction core driver for Zodiac Inflight Innovations RAVE 5 * Supervisory Processor(SP) MCU that is connected via dedicated UART 6 * port 7 * 8 * Copyright (C) 2017 Zodiac Inflight Innovations 9 */ 10 11 #include <linux/atomic.h> 12 #include <linux/crc-itu-t.h> 13 #include <linux/delay.h> 14 #include <linux/export.h> 15 #include <linux/init.h> 16 #include <linux/slab.h> 17 #include <linux/kernel.h> 18 #include <linux/mfd/rave-sp.h> 19 #include <linux/module.h> 20 #include <linux/of.h> 21 #include <linux/of_platform.h> 22 #include <linux/sched.h> 23 #include <linux/serdev.h> 24 #include <asm/unaligned.h> 25 26 /* 27 * UART protocol using following entities: 28 * - message to MCU => ACK response 29 * - event from MCU => event ACK 30 * 31 * Frame structure: 32 * <STX> <DATA> <CHECKSUM> <ETX> 33 * Where: 34 * - STX - is start of transmission character 35 * - ETX - end of transmission 36 * - DATA - payload 37 * - CHECKSUM - checksum calculated on <DATA> 38 * 39 * If <DATA> or <CHECKSUM> contain one of control characters, then it is 40 * escaped using <DLE> control code. Added <DLE> does not participate in 41 * checksum calculation. 42 */ 43 #define RAVE_SP_STX 0x02 44 #define RAVE_SP_ETX 0x03 45 #define RAVE_SP_DLE 0x10 46 47 #define RAVE_SP_MAX_DATA_SIZE 64 48 #define RAVE_SP_CHECKSUM_8B2C 1 49 #define RAVE_SP_CHECKSUM_CCITT 2 50 #define RAVE_SP_CHECKSUM_SIZE RAVE_SP_CHECKSUM_CCITT 51 /* 52 * We don't store STX, ETX and unescaped bytes, so Rx is only 53 * DATA + CSUM 54 */ 55 #define RAVE_SP_RX_BUFFER_SIZE \ 56 (RAVE_SP_MAX_DATA_SIZE + RAVE_SP_CHECKSUM_SIZE) 57 58 #define RAVE_SP_STX_ETX_SIZE 2 59 /* 60 * For Tx we have to have space for everything, STX, EXT and 61 * potentially stuffed DATA + CSUM data + csum 62 */ 63 #define RAVE_SP_TX_BUFFER_SIZE \ 64 (RAVE_SP_STX_ETX_SIZE + 2 * RAVE_SP_RX_BUFFER_SIZE) 65 66 /** 67 * enum rave_sp_deframer_state - Possible state for de-framer 68 * 69 * @RAVE_SP_EXPECT_SOF: Scanning input for start-of-frame marker 70 * @RAVE_SP_EXPECT_DATA: Got start of frame marker, collecting frame 71 * @RAVE_SP_EXPECT_ESCAPED_DATA: Got escape character, collecting escaped byte 72 */ 73 enum rave_sp_deframer_state { 74 RAVE_SP_EXPECT_SOF, 75 RAVE_SP_EXPECT_DATA, 76 RAVE_SP_EXPECT_ESCAPED_DATA, 77 }; 78 79 /** 80 * struct rave_sp_deframer - Device protocol deframer 81 * 82 * @state: Current state of the deframer 83 * @data: Buffer used to collect deframed data 84 * @length: Number of bytes de-framed so far 85 */ 86 struct rave_sp_deframer { 87 enum rave_sp_deframer_state state; 88 unsigned char data[RAVE_SP_RX_BUFFER_SIZE]; 89 size_t length; 90 }; 91 92 /** 93 * struct rave_sp_reply - Reply as per RAVE device protocol 94 * 95 * @length: Expected reply length 96 * @data: Buffer to store reply payload in 97 * @code: Expected reply code 98 * @ackid: Expected reply ACK ID 99 * @received: Successful reply reception completion 100 */ 101 struct rave_sp_reply { 102 size_t length; 103 void *data; 104 u8 code; 105 u8 ackid; 106 struct completion received; 107 }; 108 109 /** 110 * struct rave_sp_checksum - Variant specific checksum implementation details 111 * 112 * @length: Calculated checksum length 113 * @subroutine: Utilized checksum algorithm implementation 114 */ 115 struct rave_sp_checksum { 116 size_t length; 117 void (*subroutine)(const u8 *, size_t, u8 *); 118 }; 119 120 struct rave_sp_version { 121 u8 hardware; 122 __le16 major; 123 u8 minor; 124 u8 letter[2]; 125 } __packed; 126 127 struct rave_sp_status { 128 struct rave_sp_version bootloader_version; 129 struct rave_sp_version firmware_version; 130 u16 rdu_eeprom_flag; 131 u16 dds_eeprom_flag; 132 u8 pic_flag; 133 u8 orientation; 134 u32 etc; 135 s16 temp[2]; 136 u8 backlight_current[3]; 137 u8 dip_switch; 138 u8 host_interrupt; 139 u16 voltage_28; 140 u8 i2c_device_status; 141 u8 power_status; 142 u8 general_status; 143 u8 deprecated1; 144 u8 power_led_status; 145 u8 deprecated2; 146 u8 periph_power_shutoff; 147 } __packed; 148 149 /** 150 * struct rave_sp_variant_cmds - Variant specific command routines 151 * 152 * @translate: Generic to variant specific command mapping routine 153 * @get_status: Variant specific implementation of CMD_GET_STATUS 154 */ 155 struct rave_sp_variant_cmds { 156 int (*translate)(enum rave_sp_command); 157 int (*get_status)(struct rave_sp *sp, struct rave_sp_status *); 158 }; 159 160 /** 161 * struct rave_sp_variant - RAVE supervisory processor core variant 162 * 163 * @checksum: Variant specific checksum implementation 164 * @cmd: Variant specific command pointer table 165 * 166 */ 167 struct rave_sp_variant { 168 const struct rave_sp_checksum *checksum; 169 struct rave_sp_variant_cmds cmd; 170 }; 171 172 /** 173 * struct rave_sp - RAVE supervisory processor core 174 * 175 * @serdev: Pointer to underlying serdev 176 * @deframer: Stored state of the protocol deframer 177 * @ackid: ACK ID used in last reply sent to the device 178 * @bus_lock: Lock to serialize access to the device 179 * @reply_lock: Lock protecting @reply 180 * @reply: Pointer to memory to store reply payload 181 * 182 * @variant: Device variant specific information 183 * @event_notifier_list: Input event notification chain 184 * 185 * @part_number_firmware: Firmware version 186 * @part_number_bootloader: Bootloader version 187 */ 188 struct rave_sp { 189 struct serdev_device *serdev; 190 struct rave_sp_deframer deframer; 191 atomic_t ackid; 192 struct mutex bus_lock; 193 struct mutex reply_lock; 194 struct rave_sp_reply *reply; 195 196 const struct rave_sp_variant *variant; 197 struct blocking_notifier_head event_notifier_list; 198 199 const char *part_number_firmware; 200 const char *part_number_bootloader; 201 }; 202 203 static bool rave_sp_id_is_event(u8 code) 204 { 205 return (code & 0xF0) == RAVE_SP_EVNT_BASE; 206 } 207 208 static void rave_sp_unregister_event_notifier(struct device *dev, void *res) 209 { 210 struct rave_sp *sp = dev_get_drvdata(dev->parent); 211 struct notifier_block *nb = *(struct notifier_block **)res; 212 struct blocking_notifier_head *bnh = &sp->event_notifier_list; 213 214 WARN_ON(blocking_notifier_chain_unregister(bnh, nb)); 215 } 216 217 int devm_rave_sp_register_event_notifier(struct device *dev, 218 struct notifier_block *nb) 219 { 220 struct rave_sp *sp = dev_get_drvdata(dev->parent); 221 struct notifier_block **rcnb; 222 int ret; 223 224 rcnb = devres_alloc(rave_sp_unregister_event_notifier, 225 sizeof(*rcnb), GFP_KERNEL); 226 if (!rcnb) 227 return -ENOMEM; 228 229 ret = blocking_notifier_chain_register(&sp->event_notifier_list, nb); 230 if (!ret) { 231 *rcnb = nb; 232 devres_add(dev, rcnb); 233 } else { 234 devres_free(rcnb); 235 } 236 237 return ret; 238 } 239 EXPORT_SYMBOL_GPL(devm_rave_sp_register_event_notifier); 240 241 static void csum_8b2c(const u8 *buf, size_t size, u8 *crc) 242 { 243 *crc = *buf++; 244 size--; 245 246 while (size--) 247 *crc += *buf++; 248 249 *crc = 1 + ~(*crc); 250 } 251 252 static void csum_ccitt(const u8 *buf, size_t size, u8 *crc) 253 { 254 const u16 calculated = crc_itu_t(0xffff, buf, size); 255 256 /* 257 * While the rest of the wire protocol is little-endian, 258 * CCITT-16 CRC in RDU2 device is sent out in big-endian order. 259 */ 260 put_unaligned_be16(calculated, crc); 261 } 262 263 static void *stuff(unsigned char *dest, const unsigned char *src, size_t n) 264 { 265 while (n--) { 266 const unsigned char byte = *src++; 267 268 switch (byte) { 269 case RAVE_SP_STX: 270 case RAVE_SP_ETX: 271 case RAVE_SP_DLE: 272 *dest++ = RAVE_SP_DLE; 273 fallthrough; 274 default: 275 *dest++ = byte; 276 } 277 } 278 279 return dest; 280 } 281 282 static int rave_sp_write(struct rave_sp *sp, const u8 *data, u8 data_size) 283 { 284 const size_t checksum_length = sp->variant->checksum->length; 285 unsigned char frame[RAVE_SP_TX_BUFFER_SIZE]; 286 unsigned char crc[RAVE_SP_CHECKSUM_SIZE]; 287 unsigned char *dest = frame; 288 size_t length; 289 290 if (WARN_ON(checksum_length > sizeof(crc))) 291 return -ENOMEM; 292 293 if (WARN_ON(data_size > sizeof(frame))) 294 return -ENOMEM; 295 296 sp->variant->checksum->subroutine(data, data_size, crc); 297 298 *dest++ = RAVE_SP_STX; 299 dest = stuff(dest, data, data_size); 300 dest = stuff(dest, crc, checksum_length); 301 *dest++ = RAVE_SP_ETX; 302 303 length = dest - frame; 304 305 print_hex_dump_debug("rave-sp tx: ", DUMP_PREFIX_NONE, 306 16, 1, frame, length, false); 307 308 return serdev_device_write(sp->serdev, frame, length, HZ); 309 } 310 311 static u8 rave_sp_reply_code(u8 command) 312 { 313 /* 314 * There isn't a single rule that describes command code -> 315 * ACK code transformation, but, going through various 316 * versions of ICDs, there appear to be three distinct groups 317 * that can be described by simple transformation. 318 */ 319 switch (command) { 320 case 0xA0 ... 0xBE: 321 /* 322 * Commands implemented by firmware found in RDU1 and 323 * older devices all seem to obey the following rule 324 */ 325 return command + 0x20; 326 case 0xE0 ... 0xEF: 327 /* 328 * Events emitted by all versions of the firmare use 329 * least significant bit to get an ACK code 330 */ 331 return command | 0x01; 332 default: 333 /* 334 * Commands implemented by firmware found in RDU2 are 335 * similar to "old" commands, but they use slightly 336 * different offset 337 */ 338 return command + 0x40; 339 } 340 } 341 342 int rave_sp_exec(struct rave_sp *sp, 343 void *__data, size_t data_size, 344 void *reply_data, size_t reply_data_size) 345 { 346 struct rave_sp_reply reply = { 347 .data = reply_data, 348 .length = reply_data_size, 349 .received = COMPLETION_INITIALIZER_ONSTACK(reply.received), 350 }; 351 unsigned char *data = __data; 352 int command, ret = 0; 353 u8 ackid; 354 355 command = sp->variant->cmd.translate(data[0]); 356 if (command < 0) 357 return command; 358 359 ackid = atomic_inc_return(&sp->ackid); 360 reply.ackid = ackid; 361 reply.code = rave_sp_reply_code((u8)command), 362 363 mutex_lock(&sp->bus_lock); 364 365 mutex_lock(&sp->reply_lock); 366 sp->reply = &reply; 367 mutex_unlock(&sp->reply_lock); 368 369 data[0] = command; 370 data[1] = ackid; 371 372 rave_sp_write(sp, data, data_size); 373 374 if (!wait_for_completion_timeout(&reply.received, HZ)) { 375 dev_err(&sp->serdev->dev, "Command timeout\n"); 376 ret = -ETIMEDOUT; 377 378 mutex_lock(&sp->reply_lock); 379 sp->reply = NULL; 380 mutex_unlock(&sp->reply_lock); 381 } 382 383 mutex_unlock(&sp->bus_lock); 384 return ret; 385 } 386 EXPORT_SYMBOL_GPL(rave_sp_exec); 387 388 static void rave_sp_receive_event(struct rave_sp *sp, 389 const unsigned char *data, size_t length) 390 { 391 u8 cmd[] = { 392 [0] = rave_sp_reply_code(data[0]), 393 [1] = data[1], 394 }; 395 396 rave_sp_write(sp, cmd, sizeof(cmd)); 397 398 blocking_notifier_call_chain(&sp->event_notifier_list, 399 rave_sp_action_pack(data[0], data[2]), 400 NULL); 401 } 402 403 static void rave_sp_receive_reply(struct rave_sp *sp, 404 const unsigned char *data, size_t length) 405 { 406 struct device *dev = &sp->serdev->dev; 407 struct rave_sp_reply *reply; 408 const size_t payload_length = length - 2; 409 410 mutex_lock(&sp->reply_lock); 411 reply = sp->reply; 412 413 if (reply) { 414 if (reply->code == data[0] && reply->ackid == data[1] && 415 payload_length >= reply->length) { 416 /* 417 * We are relying on memcpy(dst, src, 0) to be a no-op 418 * when handling commands that have a no-payload reply 419 */ 420 memcpy(reply->data, &data[2], reply->length); 421 complete(&reply->received); 422 sp->reply = NULL; 423 } else { 424 dev_err(dev, "Ignoring incorrect reply\n"); 425 dev_dbg(dev, "Code: expected = 0x%08x received = 0x%08x\n", 426 reply->code, data[0]); 427 dev_dbg(dev, "ACK ID: expected = 0x%08x received = 0x%08x\n", 428 reply->ackid, data[1]); 429 dev_dbg(dev, "Length: expected = %zu received = %zu\n", 430 reply->length, payload_length); 431 } 432 } 433 434 mutex_unlock(&sp->reply_lock); 435 } 436 437 static void rave_sp_receive_frame(struct rave_sp *sp, 438 const unsigned char *data, 439 size_t length) 440 { 441 const size_t checksum_length = sp->variant->checksum->length; 442 const size_t payload_length = length - checksum_length; 443 const u8 *crc_reported = &data[payload_length]; 444 struct device *dev = &sp->serdev->dev; 445 u8 crc_calculated[RAVE_SP_CHECKSUM_SIZE]; 446 447 if (unlikely(checksum_length > sizeof(crc_calculated))) { 448 dev_warn(dev, "Checksum too long, dropping\n"); 449 return; 450 } 451 452 print_hex_dump_debug("rave-sp rx: ", DUMP_PREFIX_NONE, 453 16, 1, data, length, false); 454 455 if (unlikely(length <= checksum_length)) { 456 dev_warn(dev, "Dropping short frame\n"); 457 return; 458 } 459 460 sp->variant->checksum->subroutine(data, payload_length, 461 crc_calculated); 462 463 if (memcmp(crc_calculated, crc_reported, checksum_length)) { 464 dev_warn(dev, "Dropping bad frame\n"); 465 return; 466 } 467 468 if (rave_sp_id_is_event(data[0])) 469 rave_sp_receive_event(sp, data, length); 470 else 471 rave_sp_receive_reply(sp, data, length); 472 } 473 474 static ssize_t rave_sp_receive_buf(struct serdev_device *serdev, 475 const u8 *buf, size_t size) 476 { 477 struct device *dev = &serdev->dev; 478 struct rave_sp *sp = dev_get_drvdata(dev); 479 struct rave_sp_deframer *deframer = &sp->deframer; 480 const u8 *src = buf; 481 const u8 *end = buf + size; 482 483 while (src < end) { 484 const u8 byte = *src++; 485 486 switch (deframer->state) { 487 case RAVE_SP_EXPECT_SOF: 488 if (byte == RAVE_SP_STX) 489 deframer->state = RAVE_SP_EXPECT_DATA; 490 break; 491 492 case RAVE_SP_EXPECT_DATA: 493 /* 494 * Treat special byte values first 495 */ 496 switch (byte) { 497 case RAVE_SP_ETX: 498 rave_sp_receive_frame(sp, 499 deframer->data, 500 deframer->length); 501 /* 502 * Once we extracted a complete frame 503 * out of a stream, we call it done 504 * and proceed to bailing out while 505 * resetting the framer to initial 506 * state, regardless if we've consumed 507 * all of the stream or not. 508 */ 509 goto reset_framer; 510 case RAVE_SP_STX: 511 dev_warn(dev, "Bad frame: STX before ETX\n"); 512 /* 513 * If we encounter second "start of 514 * the frame" marker before seeing 515 * corresponding "end of frame", we 516 * reset the framer and ignore both: 517 * frame started by first SOF and 518 * frame started by current SOF. 519 * 520 * NOTE: The above means that only the 521 * frame started by third SOF, sent 522 * after this one will have a chance 523 * to get throught. 524 */ 525 goto reset_framer; 526 case RAVE_SP_DLE: 527 deframer->state = RAVE_SP_EXPECT_ESCAPED_DATA; 528 /* 529 * If we encounter escape sequence we 530 * need to skip it and collect the 531 * byte that follows. We do it by 532 * forcing the next iteration of the 533 * encompassing while loop. 534 */ 535 continue; 536 } 537 /* 538 * For the rest of the bytes, that are not 539 * speical snoflakes, we do the same thing 540 * that we do to escaped data - collect it in 541 * deframer buffer 542 */ 543 544 fallthrough; 545 546 case RAVE_SP_EXPECT_ESCAPED_DATA: 547 if (deframer->length == sizeof(deframer->data)) { 548 dev_warn(dev, "Bad frame: Too long\n"); 549 /* 550 * If the amount of data we've 551 * accumulated for current frame so 552 * far starts to exceed the capacity 553 * of deframer's buffer, there's 554 * nothing else we can do but to 555 * discard that data and start 556 * assemblying a new frame again 557 */ 558 goto reset_framer; 559 } 560 561 deframer->data[deframer->length++] = byte; 562 563 /* 564 * We've extracted out special byte, now we 565 * can go back to regular data collecting 566 */ 567 deframer->state = RAVE_SP_EXPECT_DATA; 568 break; 569 } 570 } 571 572 /* 573 * The only way to get out of the above loop and end up here 574 * is throught consuming all of the supplied data, so here we 575 * report that we processed it all. 576 */ 577 return size; 578 579 reset_framer: 580 /* 581 * NOTE: A number of codepaths that will drop us here will do 582 * so before consuming all 'size' bytes of the data passed by 583 * serdev layer. We rely on the fact that serdev layer will 584 * re-execute this handler with the remainder of the Rx bytes 585 * once we report actual number of bytes that we processed. 586 */ 587 deframer->state = RAVE_SP_EXPECT_SOF; 588 deframer->length = 0; 589 590 return src - buf; 591 } 592 593 static int rave_sp_rdu1_cmd_translate(enum rave_sp_command command) 594 { 595 if (command >= RAVE_SP_CMD_STATUS && 596 command <= RAVE_SP_CMD_CONTROL_EVENTS) 597 return command; 598 599 return -EINVAL; 600 } 601 602 static int rave_sp_rdu2_cmd_translate(enum rave_sp_command command) 603 { 604 if (command >= RAVE_SP_CMD_GET_FIRMWARE_VERSION && 605 command <= RAVE_SP_CMD_GET_GPIO_STATE) 606 return command; 607 608 if (command == RAVE_SP_CMD_REQ_COPPER_REV) { 609 /* 610 * As per RDU2 ICD 3.4.47 CMD_GET_COPPER_REV code is 611 * different from that for RDU1 and it is set to 0x28. 612 */ 613 return 0x28; 614 } 615 616 return rave_sp_rdu1_cmd_translate(command); 617 } 618 619 static int rave_sp_default_cmd_translate(enum rave_sp_command command) 620 { 621 /* 622 * All of the following command codes were taken from "Table : 623 * Communications Protocol Message Types" in section 3.3 624 * "MESSAGE TYPES" of Rave PIC24 ICD. 625 */ 626 switch (command) { 627 case RAVE_SP_CMD_GET_FIRMWARE_VERSION: 628 return 0x11; 629 case RAVE_SP_CMD_GET_BOOTLOADER_VERSION: 630 return 0x12; 631 case RAVE_SP_CMD_BOOT_SOURCE: 632 return 0x14; 633 case RAVE_SP_CMD_SW_WDT: 634 return 0x1C; 635 case RAVE_SP_CMD_PET_WDT: 636 return 0x1D; 637 case RAVE_SP_CMD_RESET: 638 return 0x1E; 639 case RAVE_SP_CMD_RESET_REASON: 640 return 0x1F; 641 case RAVE_SP_CMD_RMB_EEPROM: 642 return 0x20; 643 default: 644 return -EINVAL; 645 } 646 } 647 648 static const char *devm_rave_sp_version(struct device *dev, 649 struct rave_sp_version *version) 650 { 651 /* 652 * NOTE: The format string below uses %02d to display u16 653 * intentionally for the sake of backwards compatibility with 654 * legacy software. 655 */ 656 return devm_kasprintf(dev, GFP_KERNEL, "%02d%02d%02d.%c%c\n", 657 version->hardware, 658 le16_to_cpu(version->major), 659 version->minor, 660 version->letter[0], 661 version->letter[1]); 662 } 663 664 static int rave_sp_rdu1_get_status(struct rave_sp *sp, 665 struct rave_sp_status *status) 666 { 667 u8 cmd[] = { 668 [0] = RAVE_SP_CMD_STATUS, 669 [1] = 0 670 }; 671 672 return rave_sp_exec(sp, cmd, sizeof(cmd), status, sizeof(*status)); 673 } 674 675 static int rave_sp_emulated_get_status(struct rave_sp *sp, 676 struct rave_sp_status *status) 677 { 678 u8 cmd[] = { 679 [0] = RAVE_SP_CMD_GET_FIRMWARE_VERSION, 680 [1] = 0, 681 }; 682 int ret; 683 684 ret = rave_sp_exec(sp, cmd, sizeof(cmd), &status->firmware_version, 685 sizeof(status->firmware_version)); 686 if (ret) 687 return ret; 688 689 cmd[0] = RAVE_SP_CMD_GET_BOOTLOADER_VERSION; 690 return rave_sp_exec(sp, cmd, sizeof(cmd), &status->bootloader_version, 691 sizeof(status->bootloader_version)); 692 } 693 694 static int rave_sp_get_status(struct rave_sp *sp) 695 { 696 struct device *dev = &sp->serdev->dev; 697 struct rave_sp_status status; 698 const char *version; 699 int ret; 700 701 ret = sp->variant->cmd.get_status(sp, &status); 702 if (ret) 703 return ret; 704 705 version = devm_rave_sp_version(dev, &status.firmware_version); 706 if (!version) 707 return -ENOMEM; 708 709 sp->part_number_firmware = version; 710 711 version = devm_rave_sp_version(dev, &status.bootloader_version); 712 if (!version) 713 return -ENOMEM; 714 715 sp->part_number_bootloader = version; 716 717 return 0; 718 } 719 720 static const struct rave_sp_checksum rave_sp_checksum_8b2c = { 721 .length = 1, 722 .subroutine = csum_8b2c, 723 }; 724 725 static const struct rave_sp_checksum rave_sp_checksum_ccitt = { 726 .length = 2, 727 .subroutine = csum_ccitt, 728 }; 729 730 static const struct rave_sp_variant rave_sp_legacy = { 731 .checksum = &rave_sp_checksum_ccitt, 732 .cmd = { 733 .translate = rave_sp_default_cmd_translate, 734 .get_status = rave_sp_emulated_get_status, 735 }, 736 }; 737 738 static const struct rave_sp_variant rave_sp_rdu1 = { 739 .checksum = &rave_sp_checksum_8b2c, 740 .cmd = { 741 .translate = rave_sp_rdu1_cmd_translate, 742 .get_status = rave_sp_rdu1_get_status, 743 }, 744 }; 745 746 static const struct rave_sp_variant rave_sp_rdu2 = { 747 .checksum = &rave_sp_checksum_ccitt, 748 .cmd = { 749 .translate = rave_sp_rdu2_cmd_translate, 750 .get_status = rave_sp_emulated_get_status, 751 }, 752 }; 753 754 static const struct of_device_id rave_sp_dt_ids[] = { 755 { .compatible = "zii,rave-sp-niu", .data = &rave_sp_legacy }, 756 { .compatible = "zii,rave-sp-mezz", .data = &rave_sp_legacy }, 757 { .compatible = "zii,rave-sp-esb", .data = &rave_sp_legacy }, 758 { .compatible = "zii,rave-sp-rdu1", .data = &rave_sp_rdu1 }, 759 { .compatible = "zii,rave-sp-rdu2", .data = &rave_sp_rdu2 }, 760 { /* sentinel */ } 761 }; 762 763 static const struct serdev_device_ops rave_sp_serdev_device_ops = { 764 .receive_buf = rave_sp_receive_buf, 765 .write_wakeup = serdev_device_write_wakeup, 766 }; 767 768 static int rave_sp_probe(struct serdev_device *serdev) 769 { 770 struct device *dev = &serdev->dev; 771 const char *unknown = "unknown\n"; 772 struct rave_sp *sp; 773 u32 baud; 774 int ret; 775 776 if (of_property_read_u32(dev->of_node, "current-speed", &baud)) { 777 dev_err(dev, 778 "'current-speed' is not specified in device node\n"); 779 return -EINVAL; 780 } 781 782 sp = devm_kzalloc(dev, sizeof(*sp), GFP_KERNEL); 783 if (!sp) 784 return -ENOMEM; 785 786 sp->serdev = serdev; 787 dev_set_drvdata(dev, sp); 788 789 sp->variant = of_device_get_match_data(dev); 790 if (!sp->variant) 791 return -ENODEV; 792 793 mutex_init(&sp->bus_lock); 794 mutex_init(&sp->reply_lock); 795 BLOCKING_INIT_NOTIFIER_HEAD(&sp->event_notifier_list); 796 797 serdev_device_set_client_ops(serdev, &rave_sp_serdev_device_ops); 798 ret = devm_serdev_device_open(dev, serdev); 799 if (ret) 800 return ret; 801 802 serdev_device_set_baudrate(serdev, baud); 803 serdev_device_set_flow_control(serdev, false); 804 805 ret = serdev_device_set_parity(serdev, SERDEV_PARITY_NONE); 806 if (ret) { 807 dev_err(dev, "Failed to set parity\n"); 808 return ret; 809 } 810 811 ret = rave_sp_get_status(sp); 812 if (ret) { 813 dev_warn(dev, "Failed to get firmware status: %d\n", ret); 814 sp->part_number_firmware = unknown; 815 sp->part_number_bootloader = unknown; 816 } 817 818 /* 819 * Those strings already have a \n embedded, so there's no 820 * need to have one in format string. 821 */ 822 dev_info(dev, "Firmware version: %s", sp->part_number_firmware); 823 dev_info(dev, "Bootloader version: %s", sp->part_number_bootloader); 824 825 return devm_of_platform_populate(dev); 826 } 827 828 MODULE_DEVICE_TABLE(of, rave_sp_dt_ids); 829 830 static struct serdev_device_driver rave_sp_drv = { 831 .probe = rave_sp_probe, 832 .driver = { 833 .name = "rave-sp", 834 .of_match_table = rave_sp_dt_ids, 835 }, 836 }; 837 module_serdev_device_driver(rave_sp_drv); 838 839 MODULE_LICENSE("GPL"); 840 MODULE_AUTHOR("Andrey Vostrikov <andrey.vostrikov@cogentembedded.com>"); 841 MODULE_AUTHOR("Nikita Yushchenko <nikita.yoush@cogentembedded.com>"); 842 MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>"); 843 MODULE_DESCRIPTION("RAVE SP core driver"); 844