1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 __FBSDID("$FreeBSD$"); 33 34 /* 35 * General purpose routines for the IEEE1284-1994 Standard 36 */ 37 38 #include "opt_ppb_1284.h" 39 40 #include <sys/param.h> 41 #include <sys/lock.h> 42 #include <sys/mutex.h> 43 #include <sys/systm.h> 44 #include <sys/bus.h> 45 46 47 #include <dev/ppbus/ppbconf.h> 48 #include <dev/ppbus/ppb_1284.h> 49 50 #include "ppbus_if.h" 51 52 #include <dev/ppbus/ppbio.h> 53 54 #define DEVTOSOFTC(dev) ((struct ppb_data *)device_get_softc(dev)) 55 56 /* 57 * do_1284_wait() 58 * 59 * Wait for the peripherial up to 40ms 60 */ 61 static int 62 do_1284_wait(device_t bus, uint8_t mask, uint8_t status) 63 { 64 return (ppb_poll_bus(bus, 4, mask, status, PPB_NOINTR | PPB_POLL)); 65 } 66 67 static int 68 do_peripheral_wait(device_t bus, uint8_t mask, uint8_t status) 69 { 70 return (ppb_poll_bus(bus, 100, mask, status, PPB_NOINTR | PPB_POLL)); 71 } 72 73 #define nibble2char(s) (((s & ~nACK) >> 3) | (~s & nBUSY) >> 4) 74 75 /* 76 * ppb_1284_reset_error() 77 * 78 * Unconditionaly reset the error field 79 */ 80 static int 81 ppb_1284_reset_error(device_t bus, int state) 82 { 83 struct ppb_data *ppb = DEVTOSOFTC(bus); 84 85 ppb->error = PPB_NO_ERROR; 86 ppb->state = state; 87 88 return (0); 89 } 90 91 /* 92 * ppb_1284_get_state() 93 * 94 * Get IEEE1284 state 95 */ 96 int 97 ppb_1284_get_state(device_t bus) 98 { 99 struct ppb_data *ppb = DEVTOSOFTC(bus); 100 101 mtx_assert(ppb->ppc_lock, MA_OWNED); 102 return (ppb->state); 103 } 104 105 /* 106 * ppb_1284_set_state() 107 * 108 * Change IEEE1284 state if no error occurred 109 */ 110 int 111 ppb_1284_set_state(device_t bus, int state) 112 { 113 struct ppb_data *ppb = DEVTOSOFTC(bus); 114 115 /* call ppb_1284_reset_error() if you absolutely want to change 116 * the state from PPB_ERROR to another */ 117 mtx_assert(ppb->ppc_lock, MA_OWNED); 118 if ((ppb->state != PPB_ERROR) && 119 (ppb->error == PPB_NO_ERROR)) { 120 ppb->state = state; 121 ppb->error = PPB_NO_ERROR; 122 } 123 124 return (0); 125 } 126 127 static int 128 ppb_1284_set_error(device_t bus, int error, int event) 129 { 130 struct ppb_data *ppb = DEVTOSOFTC(bus); 131 132 /* do not accumulate errors */ 133 if ((ppb->error == PPB_NO_ERROR) && 134 (ppb->state != PPB_ERROR)) { 135 ppb->error = error; 136 ppb->state = PPB_ERROR; 137 } 138 139 #ifdef DEBUG_1284 140 printf("ppb1284: error=%d status=0x%x event=%d\n", error, 141 ppb_rstr(bus) & 0xff, event); 142 #endif 143 144 return (0); 145 } 146 147 /* 148 * ppb_request_mode() 149 * 150 * Converts mode+options into ext. value 151 */ 152 static int 153 ppb_request_mode(int mode, int options) 154 { 155 int request_mode = 0; 156 157 if (options & PPB_EXTENSIBILITY_LINK) { 158 request_mode = EXT_LINK_1284_NORMAL; 159 160 } else { 161 switch (mode) { 162 case PPB_NIBBLE: 163 request_mode = (options & PPB_REQUEST_ID) ? 164 NIBBLE_1284_REQUEST_ID : 165 NIBBLE_1284_NORMAL; 166 break; 167 case PPB_PS2: 168 request_mode = (options & PPB_REQUEST_ID) ? 169 BYTE_1284_REQUEST_ID : 170 BYTE_1284_NORMAL; 171 break; 172 case PPB_ECP: 173 if (options & PPB_USE_RLE) 174 request_mode = (options & PPB_REQUEST_ID) ? 175 ECP_1284_RLE_REQUEST_ID : 176 ECP_1284_RLE; 177 else 178 request_mode = (options & PPB_REQUEST_ID) ? 179 ECP_1284_REQUEST_ID : 180 ECP_1284_NORMAL; 181 break; 182 case PPB_EPP: 183 request_mode = EPP_1284_NORMAL; 184 break; 185 default: 186 panic("%s: unsupported mode %d\n", __func__, mode); 187 } 188 } 189 190 return (request_mode); 191 } 192 193 /* 194 * ppb_peripheral_negociate() 195 * 196 * Negotiate the peripheral side 197 */ 198 int 199 ppb_peripheral_negociate(device_t bus, int mode, int options) 200 { 201 int spin, request_mode, error = 0; 202 char r; 203 204 ppb_set_mode(bus, PPB_COMPATIBLE); 205 ppb_1284_set_state(bus, PPB_PERIPHERAL_NEGOCIATION); 206 207 /* compute ext. value */ 208 request_mode = ppb_request_mode(mode, options); 209 210 /* wait host */ 211 spin = 10; 212 while (spin-- && (ppb_rstr(bus) & nBUSY)) 213 DELAY(1); 214 215 /* check termination */ 216 if (!(ppb_rstr(bus) & SELECT) || !spin) { 217 error = ENODEV; 218 goto error; 219 } 220 221 /* Event 4 - read ext. value */ 222 r = ppb_rdtr(bus); 223 224 /* nibble mode is not supported */ 225 if ((r == (char)request_mode) || 226 (r == NIBBLE_1284_NORMAL)) { 227 228 /* Event 5 - restore direction bit, no data avail */ 229 ppb_wctr(bus, (STROBE | nINIT) & ~(SELECTIN)); 230 DELAY(1); 231 232 /* Event 6 */ 233 ppb_wctr(bus, (nINIT) & ~(SELECTIN | STROBE)); 234 235 if (r == NIBBLE_1284_NORMAL) { 236 #ifdef DEBUG_1284 237 printf("R"); 238 #endif 239 ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 4); 240 error = EINVAL; 241 goto error; 242 } else { 243 ppb_1284_set_state(bus, PPB_PERIPHERAL_IDLE); 244 switch (r) { 245 case BYTE_1284_NORMAL: 246 ppb_set_mode(bus, PPB_BYTE); 247 break; 248 default: 249 break; 250 } 251 #ifdef DEBUG_1284 252 printf("A"); 253 #endif 254 /* negotiation succeeds */ 255 } 256 } else { 257 /* Event 5 - mode not supported */ 258 ppb_wctr(bus, SELECTIN); 259 DELAY(1); 260 261 /* Event 6 */ 262 ppb_wctr(bus, (SELECTIN) & ~(STROBE | nINIT)); 263 ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 4); 264 265 #ifdef DEBUG_1284 266 printf("r"); 267 #endif 268 error = EINVAL; 269 goto error; 270 } 271 272 return (0); 273 274 error: 275 ppb_peripheral_terminate(bus, PPB_WAIT); 276 return (error); 277 } 278 279 /* 280 * ppb_peripheral_terminate() 281 * 282 * Terminate peripheral transfer side 283 * 284 * Always return 0 in compatible mode 285 */ 286 int 287 ppb_peripheral_terminate(device_t bus, int how) 288 { 289 int error = 0; 290 291 #ifdef DEBUG_1284 292 printf("t"); 293 #endif 294 295 ppb_1284_set_state(bus, PPB_PERIPHERAL_TERMINATION); 296 297 /* Event 22 - wait up to host response time (1s) */ 298 if ((error = do_peripheral_wait(bus, SELECT | nBUSY, 0))) { 299 ppb_1284_set_error(bus, PPB_TIMEOUT, 22); 300 goto error; 301 } 302 303 /* Event 24 */ 304 ppb_wctr(bus, (nINIT | STROBE) & ~(AUTOFEED | SELECTIN)); 305 306 /* Event 25 - wait up to host response time (1s) */ 307 if ((error = do_peripheral_wait(bus, nBUSY, nBUSY))) { 308 ppb_1284_set_error(bus, PPB_TIMEOUT, 25); 309 goto error; 310 } 311 312 /* Event 26 */ 313 ppb_wctr(bus, (SELECTIN | nINIT | STROBE) & ~(AUTOFEED)); 314 DELAY(1); 315 /* Event 27 */ 316 ppb_wctr(bus, (SELECTIN | nINIT) & ~(STROBE | AUTOFEED)); 317 318 /* Event 28 - wait up to host response time (1s) */ 319 if ((error = do_peripheral_wait(bus, nBUSY, 0))) { 320 ppb_1284_set_error(bus, PPB_TIMEOUT, 28); 321 goto error; 322 } 323 324 error: 325 ppb_set_mode(bus, PPB_COMPATIBLE); 326 ppb_1284_set_state(bus, PPB_FORWARD_IDLE); 327 328 return (0); 329 } 330 331 /* 332 * byte_peripheral_outbyte() 333 * 334 * Write 1 byte in BYTE mode 335 */ 336 static int 337 byte_peripheral_outbyte(device_t bus, char *buffer, int last) 338 { 339 int error = 0; 340 341 /* Event 7 */ 342 if ((error = do_1284_wait(bus, nBUSY, nBUSY))) { 343 ppb_1284_set_error(bus, PPB_TIMEOUT, 7); 344 goto error; 345 } 346 347 /* check termination */ 348 if (!(ppb_rstr(bus) & SELECT)) { 349 ppb_peripheral_terminate(bus, PPB_WAIT); 350 goto error; 351 } 352 353 /* Event 15 - put byte on data lines */ 354 #ifdef DEBUG_1284 355 printf("B"); 356 #endif 357 ppb_wdtr(bus, *buffer); 358 359 /* Event 9 */ 360 ppb_wctr(bus, (AUTOFEED | STROBE) & ~(nINIT | SELECTIN)); 361 362 /* Event 10 - wait data read */ 363 if ((error = do_peripheral_wait(bus, nBUSY, 0))) { 364 ppb_1284_set_error(bus, PPB_TIMEOUT, 16); 365 goto error; 366 } 367 368 /* Event 11 */ 369 if (!last) { 370 ppb_wctr(bus, (AUTOFEED) & ~(nINIT | STROBE | SELECTIN)); 371 } else { 372 ppb_wctr(bus, (nINIT) & ~(STROBE | SELECTIN | AUTOFEED)); 373 } 374 375 #if 0 376 /* Event 16 - wait strobe */ 377 if ((error = do_peripheral_wait(bus, nACK | nBUSY, 0))) { 378 ppb_1284_set_error(bus, PPB_TIMEOUT, 16); 379 goto error; 380 } 381 #endif 382 383 /* check termination */ 384 if (!(ppb_rstr(bus) & SELECT)) { 385 ppb_peripheral_terminate(bus, PPB_WAIT); 386 goto error; 387 } 388 389 error: 390 return (error); 391 } 392 393 /* 394 * byte_peripheral_write() 395 * 396 * Write n bytes in BYTE mode 397 */ 398 int 399 byte_peripheral_write(device_t bus, char *buffer, int len, int *sent) 400 { 401 int error = 0, i; 402 char r; 403 404 ppb_1284_set_state(bus, PPB_PERIPHERAL_TRANSFER); 405 406 /* wait forever, the remote host is master and should initiate 407 * termination 408 */ 409 for (i=0; i<len; i++) { 410 /* force remote nFAULT low to release the remote waiting 411 * process, if any 412 */ 413 r = ppb_rctr(bus); 414 ppb_wctr(bus, r & ~nINIT); 415 416 #ifdef DEBUG_1284 417 printf("y"); 418 #endif 419 /* Event 7 */ 420 error = ppb_poll_bus(bus, PPB_FOREVER, nBUSY, nBUSY, 421 PPB_INTR); 422 423 if (error && error != EWOULDBLOCK) 424 goto error; 425 426 #ifdef DEBUG_1284 427 printf("b"); 428 #endif 429 if ((error = byte_peripheral_outbyte(bus, buffer+i, (i == len-1)))) 430 goto error; 431 } 432 error: 433 if (!error) 434 ppb_1284_set_state(bus, PPB_PERIPHERAL_IDLE); 435 436 *sent = i; 437 return (error); 438 } 439 440 /* 441 * byte_1284_inbyte() 442 * 443 * Read 1 byte in BYTE mode 444 */ 445 int 446 byte_1284_inbyte(device_t bus, char *buffer) 447 { 448 int error = 0; 449 450 /* Event 7 - ready to take data (nAUTO low) */ 451 ppb_wctr(bus, (PCD | nINIT | AUTOFEED) & ~(STROBE | SELECTIN)); 452 453 /* Event 9 - peripheral set nAck low */ 454 if ((error = do_1284_wait(bus, nACK, 0))) { 455 ppb_1284_set_error(bus, PPB_TIMEOUT, 9); 456 goto error; 457 } 458 459 /* read the byte */ 460 *buffer = ppb_rdtr(bus); 461 462 /* Event 10 - data received, can't accept more */ 463 ppb_wctr(bus, (nINIT) & ~(AUTOFEED | STROBE | SELECTIN)); 464 465 /* Event 11 - peripheral ack */ 466 if ((error = do_1284_wait(bus, nACK, nACK))) { 467 ppb_1284_set_error(bus, PPB_TIMEOUT, 11); 468 goto error; 469 } 470 471 /* Event 16 - strobe */ 472 ppb_wctr(bus, (nINIT | STROBE) & ~(AUTOFEED | SELECTIN)); 473 DELAY(3); 474 ppb_wctr(bus, (nINIT) & ~(AUTOFEED | STROBE | SELECTIN)); 475 476 error: 477 return (error); 478 } 479 480 /* 481 * nibble_1284_inbyte() 482 * 483 * Read 1 byte in NIBBLE mode 484 */ 485 int 486 nibble_1284_inbyte(device_t bus, char *buffer) 487 { 488 char nibble[2]; 489 int i, error; 490 491 for (i = 0; i < 2; i++) { 492 493 /* Event 7 - ready to take data (nAUTO low) */ 494 ppb_wctr(bus, (nINIT | AUTOFEED) & ~(STROBE | SELECTIN)); 495 496 /* Event 8 - peripheral writes the first nibble */ 497 498 /* Event 9 - peripheral set nAck low */ 499 if ((error = do_1284_wait(bus, nACK, 0))) { 500 ppb_1284_set_error(bus, PPB_TIMEOUT, 9); 501 goto error; 502 } 503 504 /* read nibble */ 505 nibble[i] = ppb_rstr(bus); 506 507 /* Event 10 - ack, nibble received */ 508 ppb_wctr(bus, nINIT & ~(AUTOFEED | STROBE | SELECTIN)); 509 510 /* Event 11 - wait ack from peripherial */ 511 if ((error = do_1284_wait(bus, nACK, nACK))) { 512 ppb_1284_set_error(bus, PPB_TIMEOUT, 11); 513 goto error; 514 } 515 } 516 517 *buffer = ((nibble2char(nibble[1]) << 4) & 0xf0) | 518 (nibble2char(nibble[0]) & 0x0f); 519 520 error: 521 return (error); 522 } 523 524 /* 525 * spp_1284_read() 526 * 527 * Read in IEEE1284 NIBBLE/BYTE mode 528 */ 529 int 530 spp_1284_read(device_t bus, int mode, char *buffer, int max, int *read) 531 { 532 int error = 0, len = 0; 533 int terminate_after_transfer = 1; 534 int state; 535 536 *read = len = 0; 537 538 state = ppb_1284_get_state(bus); 539 540 switch (state) { 541 case PPB_FORWARD_IDLE: 542 if ((error = ppb_1284_negociate(bus, mode, 0))) 543 return (error); 544 break; 545 546 case PPB_REVERSE_IDLE: 547 terminate_after_transfer = 0; 548 break; 549 550 default: 551 ppb_1284_terminate(bus); 552 if ((error = ppb_1284_negociate(bus, mode, 0))) 553 return (error); 554 break; 555 } 556 557 while ((len < max) && !(ppb_rstr(bus) & (nFAULT))) { 558 559 ppb_1284_set_state(bus, PPB_REVERSE_TRANSFER); 560 561 #ifdef DEBUG_1284 562 printf("B"); 563 #endif 564 565 switch (mode) { 566 case PPB_NIBBLE: 567 /* read a byte, error means no more data */ 568 if (nibble_1284_inbyte(bus, buffer+len)) 569 goto end_while; 570 break; 571 case PPB_BYTE: 572 if (byte_1284_inbyte(bus, buffer+len)) 573 goto end_while; 574 break; 575 default: 576 error = EINVAL; 577 goto end_while; 578 } 579 len ++; 580 } 581 end_while: 582 583 if (!error) 584 ppb_1284_set_state(bus, PPB_REVERSE_IDLE); 585 586 *read = len; 587 588 if (terminate_after_transfer || error) 589 ppb_1284_terminate(bus); 590 591 return (error); 592 } 593 594 /* 595 * ppb_1284_read_id() 596 * 597 */ 598 int 599 ppb_1284_read_id(device_t bus, int mode, char *buffer, 600 int max, int *read) 601 { 602 int error = 0; 603 604 /* fill the buffer with 0s */ 605 bzero(buffer, max); 606 607 switch (mode) { 608 case PPB_NIBBLE: 609 case PPB_ECP: 610 if ((error = ppb_1284_negociate(bus, PPB_NIBBLE, PPB_REQUEST_ID))) 611 return (error); 612 error = spp_1284_read(bus, PPB_NIBBLE, buffer, max, read); 613 break; 614 case PPB_BYTE: 615 if ((error = ppb_1284_negociate(bus, PPB_BYTE, PPB_REQUEST_ID))) 616 return (error); 617 error = spp_1284_read(bus, PPB_BYTE, buffer, max, read); 618 break; 619 default: 620 panic("%s: unsupported mode %d\n", __func__, mode); 621 } 622 623 ppb_1284_terminate(bus); 624 return (error); 625 } 626 627 /* 628 * ppb_1284_read() 629 * 630 * IEEE1284 read 631 */ 632 int 633 ppb_1284_read(device_t bus, int mode, char *buffer, 634 int max, int *read) 635 { 636 int error = 0; 637 638 switch (mode) { 639 case PPB_NIBBLE: 640 case PPB_BYTE: 641 error = spp_1284_read(bus, mode, buffer, max, read); 642 break; 643 default: 644 return (EINVAL); 645 } 646 647 return (error); 648 } 649 650 /* 651 * ppb_1284_negociate() 652 * 653 * IEEE1284 negotiation phase 654 * 655 * Normal nibble mode or request device id mode (see ppb_1284.h) 656 * 657 * After negotiation, nFAULT is low if data is available 658 */ 659 int 660 ppb_1284_negociate(device_t bus, int mode, int options) 661 { 662 int error; 663 int request_mode; 664 665 #ifdef DEBUG_1284 666 printf("n"); 667 #endif 668 669 if (ppb_1284_get_state(bus) >= PPB_PERIPHERAL_NEGOCIATION) 670 ppb_peripheral_terminate(bus, PPB_WAIT); 671 672 if (ppb_1284_get_state(bus) != PPB_FORWARD_IDLE) 673 ppb_1284_terminate(bus); 674 675 #ifdef DEBUG_1284 676 printf("%d", mode); 677 #endif 678 679 /* ensure the host is in compatible mode */ 680 ppb_set_mode(bus, PPB_COMPATIBLE); 681 682 /* reset error to catch the actual negotiation error */ 683 ppb_1284_reset_error(bus, PPB_FORWARD_IDLE); 684 685 /* calculate ext. value */ 686 request_mode = ppb_request_mode(mode, options); 687 688 /* default state */ 689 ppb_wctr(bus, (nINIT | SELECTIN) & ~(STROBE | AUTOFEED)); 690 DELAY(1); 691 692 /* enter negotiation phase */ 693 ppb_1284_set_state(bus, PPB_NEGOCIATION); 694 695 /* Event 0 - put the exten. value on the data lines */ 696 ppb_wdtr(bus, request_mode); 697 698 #ifdef PERIPH_1284 699 /* request remote host attention */ 700 ppb_wctr(bus, (nINIT | STROBE) & ~(AUTOFEED | SELECTIN)); 701 DELAY(1); 702 ppb_wctr(bus, (nINIT) & ~(STROBE | AUTOFEED | SELECTIN)); 703 #else 704 DELAY(1); 705 706 #endif /* !PERIPH_1284 */ 707 708 /* Event 1 - enter IEEE1284 mode */ 709 ppb_wctr(bus, (nINIT | AUTOFEED) & ~(STROBE | SELECTIN)); 710 711 #ifdef PERIPH_1284 712 /* ignore the PError line, wait a bit more, remote host's 713 * interrupts don't respond fast enough */ 714 if (ppb_poll_bus(bus, 40, nACK | SELECT | nFAULT, 715 SELECT | nFAULT, PPB_NOINTR | PPB_POLL)) { 716 ppb_1284_set_error(bus, PPB_NOT_IEEE1284, 2); 717 error = ENODEV; 718 goto error; 719 } 720 #else 721 /* Event 2 - trying IEEE1284 dialog */ 722 if (do_1284_wait(bus, nACK | PERROR | SELECT | nFAULT, 723 PERROR | SELECT | nFAULT)) { 724 ppb_1284_set_error(bus, PPB_NOT_IEEE1284, 2); 725 error = ENODEV; 726 goto error; 727 } 728 #endif /* !PERIPH_1284 */ 729 730 /* Event 3 - latch the ext. value to the peripheral */ 731 ppb_wctr(bus, (nINIT | STROBE | AUTOFEED) & ~SELECTIN); 732 DELAY(1); 733 734 /* Event 4 - IEEE1284 device recognized */ 735 ppb_wctr(bus, nINIT & ~(SELECTIN | AUTOFEED | STROBE)); 736 737 /* Event 6 - waiting for status lines */ 738 if (do_1284_wait(bus, nACK, nACK)) { 739 ppb_1284_set_error(bus, PPB_TIMEOUT, 6); 740 error = EBUSY; 741 goto error; 742 } 743 744 /* Event 7 - quering result consider nACK not to misunderstand 745 * a remote computer terminate sequence */ 746 if (options & PPB_EXTENSIBILITY_LINK) { 747 748 /* XXX not fully supported yet */ 749 ppb_1284_terminate(bus); 750 return (0); 751 752 } 753 if (request_mode == NIBBLE_1284_NORMAL) { 754 if (do_1284_wait(bus, nACK | SELECT, nACK)) { 755 ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 7); 756 error = ENODEV; 757 goto error; 758 } 759 } else { 760 if (do_1284_wait(bus, nACK | SELECT, SELECT | nACK)) { 761 ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 7); 762 error = ENODEV; 763 goto error; 764 } 765 } 766 767 switch (mode) { 768 case PPB_NIBBLE: 769 case PPB_PS2: 770 /* enter reverse idle phase */ 771 ppb_1284_set_state(bus, PPB_REVERSE_IDLE); 772 break; 773 case PPB_ECP: 774 /* negotiation ok, now setup the communication */ 775 ppb_1284_set_state(bus, PPB_SETUP); 776 ppb_wctr(bus, (nINIT | AUTOFEED) & ~(SELECTIN | STROBE)); 777 778 #ifdef PERIPH_1284 779 /* ignore PError line */ 780 if (do_1284_wait(bus, nACK | SELECT | nBUSY, 781 nACK | SELECT | nBUSY)) { 782 ppb_1284_set_error(bus, PPB_TIMEOUT, 30); 783 error = ENODEV; 784 goto error; 785 } 786 #else 787 if (do_1284_wait(bus, nACK | SELECT | PERROR | nBUSY, 788 nACK | SELECT | PERROR | nBUSY)) { 789 ppb_1284_set_error(bus, PPB_TIMEOUT, 30); 790 error = ENODEV; 791 goto error; 792 } 793 #endif /* !PERIPH_1284 */ 794 795 /* ok, the host enters the ForwardIdle state */ 796 ppb_1284_set_state(bus, PPB_ECP_FORWARD_IDLE); 797 break; 798 case PPB_EPP: 799 ppb_1284_set_state(bus, PPB_EPP_IDLE); 800 break; 801 802 default: 803 panic("%s: unknown mode (%d)!", __func__, mode); 804 } 805 ppb_set_mode(bus, mode); 806 807 return (0); 808 809 error: 810 ppb_1284_terminate(bus); 811 812 return (error); 813 } 814 815 /* 816 * ppb_1284_terminate() 817 * 818 * IEEE1284 termination phase, return code should ignored since the host 819 * is _always_ in compatible mode after ppb_1284_terminate() 820 */ 821 int 822 ppb_1284_terminate(device_t bus) 823 { 824 825 #ifdef DEBUG_1284 826 printf("T"); 827 #endif 828 829 /* do not reset error here to keep the error that 830 * may occurred before the ppb_1284_terminate() call */ 831 ppb_1284_set_state(bus, PPB_TERMINATION); 832 833 #ifdef PERIPH_1284 834 /* request remote host attention */ 835 ppb_wctr(bus, (nINIT | STROBE | SELECTIN) & ~(AUTOFEED)); 836 DELAY(1); 837 #endif /* PERIPH_1284 */ 838 839 /* Event 22 - set nSelectin low and nAutoFeed high */ 840 ppb_wctr(bus, (nINIT | SELECTIN) & ~(STROBE | AUTOFEED)); 841 842 /* Event 24 - waiting for peripheral, Xflag ignored */ 843 if (do_1284_wait(bus, nACK | nBUSY | nFAULT, nFAULT)) { 844 ppb_1284_set_error(bus, PPB_TIMEOUT, 24); 845 goto error; 846 } 847 848 /* Event 25 - set nAutoFd low */ 849 ppb_wctr(bus, (nINIT | SELECTIN | AUTOFEED) & ~STROBE); 850 851 /* Event 26 - compatible mode status is set */ 852 853 /* Event 27 - peripheral set nAck high */ 854 if (do_1284_wait(bus, nACK, nACK)) { 855 ppb_1284_set_error(bus, PPB_TIMEOUT, 27); 856 } 857 858 /* Event 28 - end termination, return to idle phase */ 859 ppb_wctr(bus, (nINIT | SELECTIN) & ~(STROBE | AUTOFEED)); 860 861 error: 862 /* return to compatible mode */ 863 ppb_set_mode(bus, PPB_COMPATIBLE); 864 ppb_1284_set_state(bus, PPB_FORWARD_IDLE); 865 866 return (0); 867 } 868