1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1997 Nicolas Souchu 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * 29 */ 30 31 #include <sys/cdefs.h> 32 /* 33 * General purpose routines for the IEEE1284-1994 Standard 34 */ 35 36 #include "opt_ppb_1284.h" 37 38 #include <sys/param.h> 39 #include <sys/lock.h> 40 #include <sys/mutex.h> 41 #include <sys/systm.h> 42 #include <sys/bus.h> 43 44 #include <dev/ppbus/ppbconf.h> 45 #include <dev/ppbus/ppb_1284.h> 46 47 #include "ppbus_if.h" 48 49 #include <dev/ppbus/ppbio.h> 50 51 #define DEVTOSOFTC(dev) ((struct ppb_data *)device_get_softc(dev)) 52 53 /* 54 * do_1284_wait() 55 * 56 * Wait for the peripherial up to 40ms 57 */ 58 static int 59 do_1284_wait(device_t bus, uint8_t mask, uint8_t status) 60 { 61 return (ppb_poll_bus(bus, 4, mask, status, PPB_NOINTR | PPB_POLL)); 62 } 63 64 static int 65 do_peripheral_wait(device_t bus, uint8_t mask, uint8_t status) 66 { 67 return (ppb_poll_bus(bus, 100, mask, status, PPB_NOINTR | PPB_POLL)); 68 } 69 70 #define nibble2char(s) (((s & ~nACK) >> 3) | (~s & nBUSY) >> 4) 71 72 /* 73 * ppb_1284_reset_error() 74 * 75 * Unconditionaly reset the error field 76 */ 77 static int 78 ppb_1284_reset_error(device_t bus, int state) 79 { 80 struct ppb_data *ppb = DEVTOSOFTC(bus); 81 82 ppb->error = PPB_NO_ERROR; 83 ppb->state = state; 84 85 return (0); 86 } 87 88 /* 89 * ppb_1284_get_state() 90 * 91 * Get IEEE1284 state 92 */ 93 int 94 ppb_1284_get_state(device_t bus) 95 { 96 struct ppb_data *ppb = DEVTOSOFTC(bus); 97 98 mtx_assert(ppb->ppc_lock, MA_OWNED); 99 return (ppb->state); 100 } 101 102 /* 103 * ppb_1284_set_state() 104 * 105 * Change IEEE1284 state if no error occurred 106 */ 107 int 108 ppb_1284_set_state(device_t bus, int state) 109 { 110 struct ppb_data *ppb = DEVTOSOFTC(bus); 111 112 /* call ppb_1284_reset_error() if you absolutely want to change 113 * the state from PPB_ERROR to another */ 114 mtx_assert(ppb->ppc_lock, MA_OWNED); 115 if ((ppb->state != PPB_ERROR) && 116 (ppb->error == PPB_NO_ERROR)) { 117 ppb->state = state; 118 ppb->error = PPB_NO_ERROR; 119 } 120 121 return (0); 122 } 123 124 static int 125 ppb_1284_set_error(device_t bus, int error, int event) 126 { 127 struct ppb_data *ppb = DEVTOSOFTC(bus); 128 129 /* do not accumulate errors */ 130 if ((ppb->error == PPB_NO_ERROR) && 131 (ppb->state != PPB_ERROR)) { 132 ppb->error = error; 133 ppb->state = PPB_ERROR; 134 } 135 136 #ifdef DEBUG_1284 137 printf("ppb1284: error=%d status=0x%x event=%d\n", error, 138 ppb_rstr(bus) & 0xff, event); 139 #endif 140 141 return (0); 142 } 143 144 /* 145 * ppb_request_mode() 146 * 147 * Converts mode+options into ext. value 148 */ 149 static int 150 ppb_request_mode(int mode, int options) 151 { 152 int request_mode = 0; 153 154 if (options & PPB_EXTENSIBILITY_LINK) { 155 request_mode = EXT_LINK_1284_NORMAL; 156 157 } else { 158 switch (mode) { 159 case PPB_NIBBLE: 160 request_mode = (options & PPB_REQUEST_ID) ? 161 NIBBLE_1284_REQUEST_ID : 162 NIBBLE_1284_NORMAL; 163 break; 164 case PPB_PS2: 165 request_mode = (options & PPB_REQUEST_ID) ? 166 BYTE_1284_REQUEST_ID : 167 BYTE_1284_NORMAL; 168 break; 169 case PPB_ECP: 170 if (options & PPB_USE_RLE) 171 request_mode = (options & PPB_REQUEST_ID) ? 172 ECP_1284_RLE_REQUEST_ID : 173 ECP_1284_RLE; 174 else 175 request_mode = (options & PPB_REQUEST_ID) ? 176 ECP_1284_REQUEST_ID : 177 ECP_1284_NORMAL; 178 break; 179 case PPB_EPP: 180 request_mode = EPP_1284_NORMAL; 181 break; 182 default: 183 panic("%s: unsupported mode %d\n", __func__, mode); 184 } 185 } 186 187 return (request_mode); 188 } 189 190 /* 191 * ppb_peripheral_negociate() 192 * 193 * Negotiate the peripheral side 194 */ 195 int 196 ppb_peripheral_negociate(device_t bus, int mode, int options) 197 { 198 int spin, request_mode, error = 0; 199 char r; 200 201 ppb_set_mode(bus, PPB_COMPATIBLE); 202 ppb_1284_set_state(bus, PPB_PERIPHERAL_NEGOCIATION); 203 204 /* compute ext. value */ 205 request_mode = ppb_request_mode(mode, options); 206 207 /* wait host */ 208 spin = 10; 209 while (spin-- && (ppb_rstr(bus) & nBUSY)) 210 DELAY(1); 211 212 /* check termination */ 213 if (!(ppb_rstr(bus) & SELECT) || !spin) { 214 error = ENODEV; 215 goto error; 216 } 217 218 /* Event 4 - read ext. value */ 219 r = ppb_rdtr(bus); 220 221 /* nibble mode is not supported */ 222 if ((r == (char)request_mode) || 223 (r == NIBBLE_1284_NORMAL)) { 224 /* Event 5 - restore direction bit, no data avail */ 225 ppb_wctr(bus, (STROBE | nINIT) & ~(SELECTIN)); 226 DELAY(1); 227 228 /* Event 6 */ 229 ppb_wctr(bus, (nINIT) & ~(SELECTIN | STROBE)); 230 231 if (r == NIBBLE_1284_NORMAL) { 232 #ifdef DEBUG_1284 233 printf("R"); 234 #endif 235 ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 4); 236 error = EINVAL; 237 goto error; 238 } else { 239 ppb_1284_set_state(bus, PPB_PERIPHERAL_IDLE); 240 switch (r) { 241 case BYTE_1284_NORMAL: 242 ppb_set_mode(bus, PPB_BYTE); 243 break; 244 default: 245 break; 246 } 247 #ifdef DEBUG_1284 248 printf("A"); 249 #endif 250 /* negotiation succeeds */ 251 } 252 } else { 253 /* Event 5 - mode not supported */ 254 ppb_wctr(bus, SELECTIN); 255 DELAY(1); 256 257 /* Event 6 */ 258 ppb_wctr(bus, (SELECTIN) & ~(STROBE | nINIT)); 259 ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 4); 260 261 #ifdef DEBUG_1284 262 printf("r"); 263 #endif 264 error = EINVAL; 265 goto error; 266 } 267 268 return (0); 269 270 error: 271 ppb_peripheral_terminate(bus, PPB_WAIT); 272 return (error); 273 } 274 275 /* 276 * ppb_peripheral_terminate() 277 * 278 * Terminate peripheral transfer side 279 * 280 * Always return 0 in compatible mode 281 */ 282 int 283 ppb_peripheral_terminate(device_t bus, int how) 284 { 285 int error = 0; 286 287 #ifdef DEBUG_1284 288 printf("t"); 289 #endif 290 291 ppb_1284_set_state(bus, PPB_PERIPHERAL_TERMINATION); 292 293 /* Event 22 - wait up to host response time (1s) */ 294 if ((error = do_peripheral_wait(bus, SELECT | nBUSY, 0))) { 295 ppb_1284_set_error(bus, PPB_TIMEOUT, 22); 296 goto error; 297 } 298 299 /* Event 24 */ 300 ppb_wctr(bus, (nINIT | STROBE) & ~(AUTOFEED | SELECTIN)); 301 302 /* Event 25 - wait up to host response time (1s) */ 303 if ((error = do_peripheral_wait(bus, nBUSY, nBUSY))) { 304 ppb_1284_set_error(bus, PPB_TIMEOUT, 25); 305 goto error; 306 } 307 308 /* Event 26 */ 309 ppb_wctr(bus, (SELECTIN | nINIT | STROBE) & ~(AUTOFEED)); 310 DELAY(1); 311 /* Event 27 */ 312 ppb_wctr(bus, (SELECTIN | nINIT) & ~(STROBE | AUTOFEED)); 313 314 /* Event 28 - wait up to host response time (1s) */ 315 if ((error = do_peripheral_wait(bus, nBUSY, 0))) { 316 ppb_1284_set_error(bus, PPB_TIMEOUT, 28); 317 goto error; 318 } 319 320 error: 321 ppb_set_mode(bus, PPB_COMPATIBLE); 322 ppb_1284_set_state(bus, PPB_FORWARD_IDLE); 323 324 return (0); 325 } 326 327 /* 328 * byte_peripheral_outbyte() 329 * 330 * Write 1 byte in BYTE mode 331 */ 332 static int 333 byte_peripheral_outbyte(device_t bus, char *buffer, int last) 334 { 335 int error = 0; 336 337 /* Event 7 */ 338 if ((error = do_1284_wait(bus, nBUSY, nBUSY))) { 339 ppb_1284_set_error(bus, PPB_TIMEOUT, 7); 340 goto error; 341 } 342 343 /* check termination */ 344 if (!(ppb_rstr(bus) & SELECT)) { 345 ppb_peripheral_terminate(bus, PPB_WAIT); 346 goto error; 347 } 348 349 /* Event 15 - put byte on data lines */ 350 #ifdef DEBUG_1284 351 printf("B"); 352 #endif 353 ppb_wdtr(bus, *buffer); 354 355 /* Event 9 */ 356 ppb_wctr(bus, (AUTOFEED | STROBE) & ~(nINIT | SELECTIN)); 357 358 /* Event 10 - wait data read */ 359 if ((error = do_peripheral_wait(bus, nBUSY, 0))) { 360 ppb_1284_set_error(bus, PPB_TIMEOUT, 16); 361 goto error; 362 } 363 364 /* Event 11 */ 365 if (!last) { 366 ppb_wctr(bus, (AUTOFEED) & ~(nINIT | STROBE | SELECTIN)); 367 } else { 368 ppb_wctr(bus, (nINIT) & ~(STROBE | SELECTIN | AUTOFEED)); 369 } 370 371 #if 0 372 /* Event 16 - wait strobe */ 373 if ((error = do_peripheral_wait(bus, nACK | nBUSY, 0))) { 374 ppb_1284_set_error(bus, PPB_TIMEOUT, 16); 375 goto error; 376 } 377 #endif 378 379 /* check termination */ 380 if (!(ppb_rstr(bus) & SELECT)) { 381 ppb_peripheral_terminate(bus, PPB_WAIT); 382 goto error; 383 } 384 385 error: 386 return (error); 387 } 388 389 /* 390 * byte_peripheral_write() 391 * 392 * Write n bytes in BYTE mode 393 */ 394 int 395 byte_peripheral_write(device_t bus, char *buffer, int len, int *sent) 396 { 397 int error = 0, i; 398 char r; 399 400 ppb_1284_set_state(bus, PPB_PERIPHERAL_TRANSFER); 401 402 /* wait forever, the remote host is master and should initiate 403 * termination 404 */ 405 for (i=0; i<len; i++) { 406 /* force remote nFAULT low to release the remote waiting 407 * process, if any 408 */ 409 r = ppb_rctr(bus); 410 ppb_wctr(bus, r & ~nINIT); 411 412 #ifdef DEBUG_1284 413 printf("y"); 414 #endif 415 /* Event 7 */ 416 error = ppb_poll_bus(bus, PPB_FOREVER, nBUSY, nBUSY, 417 PPB_INTR); 418 419 if (error && error != EWOULDBLOCK) 420 goto error; 421 422 #ifdef DEBUG_1284 423 printf("b"); 424 #endif 425 if ((error = byte_peripheral_outbyte(bus, buffer+i, (i == len-1)))) 426 goto error; 427 } 428 error: 429 if (!error) 430 ppb_1284_set_state(bus, PPB_PERIPHERAL_IDLE); 431 432 *sent = i; 433 return (error); 434 } 435 436 /* 437 * byte_1284_inbyte() 438 * 439 * Read 1 byte in BYTE mode 440 */ 441 int 442 byte_1284_inbyte(device_t bus, char *buffer) 443 { 444 int error = 0; 445 446 /* Event 7 - ready to take data (nAUTO low) */ 447 ppb_wctr(bus, (PCD | nINIT | AUTOFEED) & ~(STROBE | SELECTIN)); 448 449 /* Event 9 - peripheral set nAck low */ 450 if ((error = do_1284_wait(bus, nACK, 0))) { 451 ppb_1284_set_error(bus, PPB_TIMEOUT, 9); 452 goto error; 453 } 454 455 /* read the byte */ 456 *buffer = ppb_rdtr(bus); 457 458 /* Event 10 - data received, can't accept more */ 459 ppb_wctr(bus, (nINIT) & ~(AUTOFEED | STROBE | SELECTIN)); 460 461 /* Event 11 - peripheral ack */ 462 if ((error = do_1284_wait(bus, nACK, nACK))) { 463 ppb_1284_set_error(bus, PPB_TIMEOUT, 11); 464 goto error; 465 } 466 467 /* Event 16 - strobe */ 468 ppb_wctr(bus, (nINIT | STROBE) & ~(AUTOFEED | SELECTIN)); 469 DELAY(3); 470 ppb_wctr(bus, (nINIT) & ~(AUTOFEED | STROBE | SELECTIN)); 471 472 error: 473 return (error); 474 } 475 476 /* 477 * nibble_1284_inbyte() 478 * 479 * Read 1 byte in NIBBLE mode 480 */ 481 int 482 nibble_1284_inbyte(device_t bus, char *buffer) 483 { 484 char nibble[2]; 485 int i, error; 486 487 for (i = 0; i < 2; i++) { 488 /* Event 7 - ready to take data (nAUTO low) */ 489 ppb_wctr(bus, (nINIT | AUTOFEED) & ~(STROBE | SELECTIN)); 490 491 /* Event 8 - peripheral writes the first nibble */ 492 493 /* Event 9 - peripheral set nAck low */ 494 if ((error = do_1284_wait(bus, nACK, 0))) { 495 ppb_1284_set_error(bus, PPB_TIMEOUT, 9); 496 goto error; 497 } 498 499 /* read nibble */ 500 nibble[i] = ppb_rstr(bus); 501 502 /* Event 10 - ack, nibble received */ 503 ppb_wctr(bus, nINIT & ~(AUTOFEED | STROBE | SELECTIN)); 504 505 /* Event 11 - wait ack from peripherial */ 506 if ((error = do_1284_wait(bus, nACK, nACK))) { 507 ppb_1284_set_error(bus, PPB_TIMEOUT, 11); 508 goto error; 509 } 510 } 511 512 *buffer = ((nibble2char(nibble[1]) << 4) & 0xf0) | 513 (nibble2char(nibble[0]) & 0x0f); 514 515 error: 516 return (error); 517 } 518 519 /* 520 * spp_1284_read() 521 * 522 * Read in IEEE1284 NIBBLE/BYTE mode 523 */ 524 int 525 spp_1284_read(device_t bus, int mode, char *buffer, int max, int *read) 526 { 527 int error = 0, len = 0; 528 int terminate_after_transfer = 1; 529 int state; 530 531 *read = len = 0; 532 533 state = ppb_1284_get_state(bus); 534 535 switch (state) { 536 case PPB_FORWARD_IDLE: 537 if ((error = ppb_1284_negociate(bus, mode, 0))) 538 return (error); 539 break; 540 541 case PPB_REVERSE_IDLE: 542 terminate_after_transfer = 0; 543 break; 544 545 default: 546 ppb_1284_terminate(bus); 547 if ((error = ppb_1284_negociate(bus, mode, 0))) 548 return (error); 549 break; 550 } 551 552 while ((len < max) && !(ppb_rstr(bus) & (nFAULT))) { 553 ppb_1284_set_state(bus, PPB_REVERSE_TRANSFER); 554 555 #ifdef DEBUG_1284 556 printf("B"); 557 #endif 558 559 switch (mode) { 560 case PPB_NIBBLE: 561 /* read a byte, error means no more data */ 562 if (nibble_1284_inbyte(bus, buffer+len)) 563 goto end_while; 564 break; 565 case PPB_BYTE: 566 if (byte_1284_inbyte(bus, buffer+len)) 567 goto end_while; 568 break; 569 default: 570 error = EINVAL; 571 goto end_while; 572 } 573 len ++; 574 } 575 end_while: 576 577 if (!error) 578 ppb_1284_set_state(bus, PPB_REVERSE_IDLE); 579 580 *read = len; 581 582 if (terminate_after_transfer || error) 583 ppb_1284_terminate(bus); 584 585 return (error); 586 } 587 588 /* 589 * ppb_1284_read_id() 590 * 591 */ 592 int 593 ppb_1284_read_id(device_t bus, int mode, char *buffer, 594 int max, int *read) 595 { 596 int error = 0; 597 598 /* fill the buffer with 0s */ 599 bzero(buffer, max); 600 601 switch (mode) { 602 case PPB_NIBBLE: 603 case PPB_ECP: 604 if ((error = ppb_1284_negociate(bus, PPB_NIBBLE, PPB_REQUEST_ID))) 605 return (error); 606 error = spp_1284_read(bus, PPB_NIBBLE, buffer, max, read); 607 break; 608 case PPB_BYTE: 609 if ((error = ppb_1284_negociate(bus, PPB_BYTE, PPB_REQUEST_ID))) 610 return (error); 611 error = spp_1284_read(bus, PPB_BYTE, buffer, max, read); 612 break; 613 default: 614 panic("%s: unsupported mode %d\n", __func__, mode); 615 } 616 617 ppb_1284_terminate(bus); 618 return (error); 619 } 620 621 /* 622 * ppb_1284_read() 623 * 624 * IEEE1284 read 625 */ 626 int 627 ppb_1284_read(device_t bus, int mode, char *buffer, 628 int max, int *read) 629 { 630 int error = 0; 631 632 switch (mode) { 633 case PPB_NIBBLE: 634 case PPB_BYTE: 635 error = spp_1284_read(bus, mode, buffer, max, read); 636 break; 637 default: 638 return (EINVAL); 639 } 640 641 return (error); 642 } 643 644 /* 645 * ppb_1284_negociate() 646 * 647 * IEEE1284 negotiation phase 648 * 649 * Normal nibble mode or request device id mode (see ppb_1284.h) 650 * 651 * After negotiation, nFAULT is low if data is available 652 */ 653 int 654 ppb_1284_negociate(device_t bus, int mode, int options) 655 { 656 int error; 657 int request_mode; 658 659 #ifdef DEBUG_1284 660 printf("n"); 661 #endif 662 663 if (ppb_1284_get_state(bus) >= PPB_PERIPHERAL_NEGOCIATION) 664 ppb_peripheral_terminate(bus, PPB_WAIT); 665 666 if (ppb_1284_get_state(bus) != PPB_FORWARD_IDLE) 667 ppb_1284_terminate(bus); 668 669 #ifdef DEBUG_1284 670 printf("%d", mode); 671 #endif 672 673 /* ensure the host is in compatible mode */ 674 ppb_set_mode(bus, PPB_COMPATIBLE); 675 676 /* reset error to catch the actual negotiation error */ 677 ppb_1284_reset_error(bus, PPB_FORWARD_IDLE); 678 679 /* calculate ext. value */ 680 request_mode = ppb_request_mode(mode, options); 681 682 /* default state */ 683 ppb_wctr(bus, (nINIT | SELECTIN) & ~(STROBE | AUTOFEED)); 684 DELAY(1); 685 686 /* enter negotiation phase */ 687 ppb_1284_set_state(bus, PPB_NEGOCIATION); 688 689 /* Event 0 - put the exten. value on the data lines */ 690 ppb_wdtr(bus, request_mode); 691 692 #ifdef PERIPH_1284 693 /* request remote host attention */ 694 ppb_wctr(bus, (nINIT | STROBE) & ~(AUTOFEED | SELECTIN)); 695 DELAY(1); 696 ppb_wctr(bus, (nINIT) & ~(STROBE | AUTOFEED | SELECTIN)); 697 #else 698 DELAY(1); 699 700 #endif /* !PERIPH_1284 */ 701 702 /* Event 1 - enter IEEE1284 mode */ 703 ppb_wctr(bus, (nINIT | AUTOFEED) & ~(STROBE | SELECTIN)); 704 705 #ifdef PERIPH_1284 706 /* ignore the PError line, wait a bit more, remote host's 707 * interrupts don't respond fast enough */ 708 if (ppb_poll_bus(bus, 40, nACK | SELECT | nFAULT, 709 SELECT | nFAULT, PPB_NOINTR | PPB_POLL)) { 710 ppb_1284_set_error(bus, PPB_NOT_IEEE1284, 2); 711 error = ENODEV; 712 goto error; 713 } 714 #else 715 /* Event 2 - trying IEEE1284 dialog */ 716 if (do_1284_wait(bus, nACK | PERROR | SELECT | nFAULT, 717 PERROR | SELECT | nFAULT)) { 718 ppb_1284_set_error(bus, PPB_NOT_IEEE1284, 2); 719 error = ENODEV; 720 goto error; 721 } 722 #endif /* !PERIPH_1284 */ 723 724 /* Event 3 - latch the ext. value to the peripheral */ 725 ppb_wctr(bus, (nINIT | STROBE | AUTOFEED) & ~SELECTIN); 726 DELAY(1); 727 728 /* Event 4 - IEEE1284 device recognized */ 729 ppb_wctr(bus, nINIT & ~(SELECTIN | AUTOFEED | STROBE)); 730 731 /* Event 6 - waiting for status lines */ 732 if (do_1284_wait(bus, nACK, nACK)) { 733 ppb_1284_set_error(bus, PPB_TIMEOUT, 6); 734 error = EBUSY; 735 goto error; 736 } 737 738 /* Event 7 - querying result consider nACK not to misunderstand 739 * a remote computer terminate sequence */ 740 if (options & PPB_EXTENSIBILITY_LINK) { 741 /* XXX not fully supported yet */ 742 ppb_1284_terminate(bus); 743 return (0); 744 } 745 if (request_mode == NIBBLE_1284_NORMAL) { 746 if (do_1284_wait(bus, nACK | SELECT, nACK)) { 747 ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 7); 748 error = ENODEV; 749 goto error; 750 } 751 } else { 752 if (do_1284_wait(bus, nACK | SELECT, SELECT | nACK)) { 753 ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 7); 754 error = ENODEV; 755 goto error; 756 } 757 } 758 759 switch (mode) { 760 case PPB_NIBBLE: 761 case PPB_PS2: 762 /* enter reverse idle phase */ 763 ppb_1284_set_state(bus, PPB_REVERSE_IDLE); 764 break; 765 case PPB_ECP: 766 /* negotiation ok, now setup the communication */ 767 ppb_1284_set_state(bus, PPB_SETUP); 768 ppb_wctr(bus, (nINIT | AUTOFEED) & ~(SELECTIN | STROBE)); 769 770 #ifdef PERIPH_1284 771 /* ignore PError line */ 772 if (do_1284_wait(bus, nACK | SELECT | nBUSY, 773 nACK | SELECT | nBUSY)) { 774 ppb_1284_set_error(bus, PPB_TIMEOUT, 30); 775 error = ENODEV; 776 goto error; 777 } 778 #else 779 if (do_1284_wait(bus, nACK | SELECT | PERROR | nBUSY, 780 nACK | SELECT | PERROR | nBUSY)) { 781 ppb_1284_set_error(bus, PPB_TIMEOUT, 30); 782 error = ENODEV; 783 goto error; 784 } 785 #endif /* !PERIPH_1284 */ 786 787 /* ok, the host enters the ForwardIdle state */ 788 ppb_1284_set_state(bus, PPB_ECP_FORWARD_IDLE); 789 break; 790 case PPB_EPP: 791 ppb_1284_set_state(bus, PPB_EPP_IDLE); 792 break; 793 794 default: 795 panic("%s: unknown mode (%d)!", __func__, mode); 796 } 797 ppb_set_mode(bus, mode); 798 799 return (0); 800 801 error: 802 ppb_1284_terminate(bus); 803 804 return (error); 805 } 806 807 /* 808 * ppb_1284_terminate() 809 * 810 * IEEE1284 termination phase, return code should ignored since the host 811 * is _always_ in compatible mode after ppb_1284_terminate() 812 */ 813 int 814 ppb_1284_terminate(device_t bus) 815 { 816 817 #ifdef DEBUG_1284 818 printf("T"); 819 #endif 820 821 /* do not reset error here to keep the error that 822 * may occurred before the ppb_1284_terminate() call */ 823 ppb_1284_set_state(bus, PPB_TERMINATION); 824 825 #ifdef PERIPH_1284 826 /* request remote host attention */ 827 ppb_wctr(bus, (nINIT | STROBE | SELECTIN) & ~(AUTOFEED)); 828 DELAY(1); 829 #endif /* PERIPH_1284 */ 830 831 /* Event 22 - set nSelectin low and nAutoFeed high */ 832 ppb_wctr(bus, (nINIT | SELECTIN) & ~(STROBE | AUTOFEED)); 833 834 /* Event 24 - waiting for peripheral, Xflag ignored */ 835 if (do_1284_wait(bus, nACK | nBUSY | nFAULT, nFAULT)) { 836 ppb_1284_set_error(bus, PPB_TIMEOUT, 24); 837 goto error; 838 } 839 840 /* Event 25 - set nAutoFd low */ 841 ppb_wctr(bus, (nINIT | SELECTIN | AUTOFEED) & ~STROBE); 842 843 /* Event 26 - compatible mode status is set */ 844 845 /* Event 27 - peripheral set nAck high */ 846 if (do_1284_wait(bus, nACK, nACK)) { 847 ppb_1284_set_error(bus, PPB_TIMEOUT, 27); 848 } 849 850 /* Event 28 - end termination, return to idle phase */ 851 ppb_wctr(bus, (nINIT | SELECTIN) & ~(STROBE | AUTOFEED)); 852 853 error: 854 /* return to compatible mode */ 855 ppb_set_mode(bus, PPB_COMPATIBLE); 856 ppb_1284_set_state(bus, PPB_FORWARD_IDLE); 857 858 return (0); 859 } 860