ppb_1284.c revision 119418
1/*- 2 * Copyright (c) 1997 Nicolas Souchu 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: head/sys/dev/ppbus/ppb_1284.c 119418 2003-08-24 17:55:58Z obrien $"); 31 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/systm.h> 40#include <sys/bus.h> 41 42 43#include <dev/ppbus/ppbconf.h> 44#include <dev/ppbus/ppb_1284.h> 45 46#include "ppbus_if.h" 47 48#include <dev/ppbus/ppbio.h> 49 50#define DEVTOSOFTC(dev) ((struct ppb_data *)device_get_softc(dev)) 51 52/* 53 * do_1284_wait() 54 * 55 * Wait for the peripherial up to 40ms 56 */ 57static int 58do_1284_wait(device_t bus, char mask, char status) 59{ 60 return (ppb_poll_bus(bus, 4, mask, status, PPB_NOINTR | PPB_POLL)); 61} 62 63static int 64do_peripheral_wait(device_t bus, char mask, char status) 65{ 66 return (ppb_poll_bus(bus, 100, mask, status, PPB_NOINTR | PPB_POLL)); 67} 68 69#define nibble2char(s) (((s & ~nACK) >> 3) | (~s & nBUSY) >> 4) 70 71/* 72 * ppb_1284_reset_error() 73 * 74 * Unconditionaly reset the error field 75 */ 76static int 77ppb_1284_reset_error(device_t bus, int state) 78{ 79 struct ppb_data *ppb = DEVTOSOFTC(bus); 80 81 ppb->error = PPB_NO_ERROR; 82 ppb->state = state; 83 84 return (0); 85} 86 87/* 88 * ppb_1284_get_state() 89 * 90 * Get IEEE1284 state 91 */ 92int 93ppb_1284_get_state(device_t bus) 94{ 95 return (DEVTOSOFTC(bus)->state); 96} 97 98/* 99 * ppb_1284_set_state() 100 * 101 * Change IEEE1284 state if no error occured 102 */ 103int 104ppb_1284_set_state(device_t bus, int state) 105{ 106 struct ppb_data *ppb = DEVTOSOFTC(bus); 107 108 /* call ppb_1284_reset_error() if you absolutly want to change 109 * the state from PPB_ERROR to another */ 110 if ((ppb->state != PPB_ERROR) && 111 (ppb->error == PPB_NO_ERROR)) { 112 ppb->state = state; 113 ppb->error = PPB_NO_ERROR; 114 } 115 116 return (0); 117} 118 119static int 120ppb_1284_set_error(device_t bus, int error, int event) 121{ 122 struct ppb_data *ppb = DEVTOSOFTC(bus); 123 124 /* do not accumulate errors */ 125 if ((ppb->error == PPB_NO_ERROR) && 126 (ppb->state != PPB_ERROR)) { 127 ppb->error = error; 128 ppb->state = PPB_ERROR; 129 } 130 131#ifdef DEBUG_1284 132 printf("ppb1284: error=%d status=0x%x event=%d\n", error, 133 ppb_rstr(bus) & 0xff, event); 134#endif 135 136 return (0); 137} 138 139/* 140 * ppb_request_mode() 141 * 142 * Converts mode+options into ext. value 143 */ 144static int 145ppb_request_mode(int mode, int options) 146{ 147 int request_mode = 0; 148 149 if (options & PPB_EXTENSIBILITY_LINK) { 150 request_mode = EXT_LINK_1284_NORMAL; 151 152 } else { 153 switch (mode) { 154 case PPB_NIBBLE: 155 request_mode = (options & PPB_REQUEST_ID) ? 156 NIBBLE_1284_REQUEST_ID : 157 NIBBLE_1284_NORMAL; 158 break; 159 case PPB_PS2: 160 request_mode = (options & PPB_REQUEST_ID) ? 161 BYTE_1284_REQUEST_ID : 162 BYTE_1284_NORMAL; 163 break; 164 case PPB_ECP: 165 if (options & PPB_USE_RLE) 166 request_mode = (options & PPB_REQUEST_ID) ? 167 ECP_1284_RLE_REQUEST_ID : 168 ECP_1284_RLE; 169 else 170 request_mode = (options & PPB_REQUEST_ID) ? 171 ECP_1284_REQUEST_ID : 172 ECP_1284_NORMAL; 173 break; 174 case PPB_EPP: 175 request_mode = EPP_1284_NORMAL; 176 break; 177 default: 178 panic("%s: unsupported mode %d\n", __func__, mode); 179 } 180 } 181 182 return (request_mode); 183} 184 185/* 186 * ppb_peripheral_negociate() 187 * 188 * Negociate the peripheral side 189 */ 190int 191ppb_peripheral_negociate(device_t bus, int mode, int options) 192{ 193 int spin, request_mode, error = 0; 194 char r; 195 196 ppb_set_mode(bus, PPB_COMPATIBLE); 197 ppb_1284_set_state(bus, PPB_PERIPHERAL_NEGOCIATION); 198 199 /* compute ext. value */ 200 request_mode = ppb_request_mode(mode, options); 201 202 /* wait host */ 203 spin = 10; 204 while (spin-- && (ppb_rstr(bus) & nBUSY)) 205 DELAY(1); 206 207 /* check termination */ 208 if (!(ppb_rstr(bus) & SELECT) || !spin) { 209 error = ENODEV; 210 goto error; 211 } 212 213 /* Event 4 - read ext. value */ 214 r = ppb_rdtr(bus); 215 216 /* nibble mode is not supported */ 217 if ((r == (char)request_mode) || 218 (r == NIBBLE_1284_NORMAL)) { 219 220 /* Event 5 - restore direction bit, no data avail */ 221 ppb_wctr(bus, (STROBE | nINIT) & ~(SELECTIN)); 222 DELAY(1); 223 224 /* Event 6 */ 225 ppb_wctr(bus, (nINIT) & ~(SELECTIN | STROBE)); 226 227 if (r == NIBBLE_1284_NORMAL) { 228#ifdef DEBUG_1284 229 printf("R"); 230#endif 231 ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 4); 232 error = EINVAL; 233 goto error; 234 } else { 235 ppb_1284_set_state(bus, PPB_PERIPHERAL_IDLE); 236 switch (r) { 237 case BYTE_1284_NORMAL: 238 ppb_set_mode(bus, PPB_BYTE); 239 break; 240 default: 241 break; 242 } 243#ifdef DEBUG_1284 244 printf("A"); 245#endif 246 /* negociation succeeds */ 247 } 248 } else { 249 /* Event 5 - mode not supported */ 250 ppb_wctr(bus, SELECTIN); 251 DELAY(1); 252 253 /* Event 6 */ 254 ppb_wctr(bus, (SELECTIN) & ~(STROBE | nINIT)); 255 ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 4); 256 257#ifdef DEBUG_1284 258 printf("r"); 259#endif 260 error = EINVAL; 261 goto error; 262 } 263 264 return (0); 265 266error: 267 ppb_peripheral_terminate(bus, PPB_WAIT); 268 return (error); 269} 270 271/* 272 * ppb_peripheral_terminate() 273 * 274 * Terminate peripheral transfer side 275 * 276 * Always return 0 in compatible mode 277 */ 278int 279ppb_peripheral_terminate(device_t bus, int how) 280{ 281 int error = 0; 282 283#ifdef DEBUG_1284 284 printf("t"); 285#endif 286 287 ppb_1284_set_state(bus, PPB_PERIPHERAL_TERMINATION); 288 289 /* Event 22 - wait up to host response time (1s) */ 290 if ((error = do_peripheral_wait(bus, SELECT | nBUSY, 0))) { 291 ppb_1284_set_error(bus, PPB_TIMEOUT, 22); 292 goto error; 293 } 294 295 /* Event 24 */ 296 ppb_wctr(bus, (nINIT | STROBE) & ~(AUTOFEED | SELECTIN)); 297 298 /* Event 25 - wait up to host response time (1s) */ 299 if ((error = do_peripheral_wait(bus, nBUSY, nBUSY))) { 300 ppb_1284_set_error(bus, PPB_TIMEOUT, 25); 301 goto error; 302 } 303 304 /* Event 26 */ 305 ppb_wctr(bus, (SELECTIN | nINIT | STROBE) & ~(AUTOFEED)); 306 DELAY(1); 307 /* Event 27 */ 308 ppb_wctr(bus, (SELECTIN | nINIT) & ~(STROBE | AUTOFEED)); 309 310 /* Event 28 - wait up to host response time (1s) */ 311 if ((error = do_peripheral_wait(bus, nBUSY, 0))) { 312 ppb_1284_set_error(bus, PPB_TIMEOUT, 28); 313 goto error; 314 } 315 316error: 317 ppb_set_mode(bus, PPB_COMPATIBLE); 318 ppb_1284_set_state(bus, PPB_FORWARD_IDLE); 319 320 return (0); 321} 322 323/* 324 * byte_peripheral_outbyte() 325 * 326 * Write 1 byte in BYTE mode 327 */ 328static int 329byte_peripheral_outbyte(device_t bus, char *buffer, int last) 330{ 331 int error = 0; 332 333 /* Event 7 */ 334 if ((error = do_1284_wait(bus, nBUSY, nBUSY))) { 335 ppb_1284_set_error(bus, PPB_TIMEOUT, 7); 336 goto error; 337 } 338 339 /* check termination */ 340 if (!(ppb_rstr(bus) & SELECT)) { 341 ppb_peripheral_terminate(bus, PPB_WAIT); 342 goto error; 343 } 344 345 /* Event 15 - put byte on data lines */ 346#ifdef DEBUG_1284 347 printf("B"); 348#endif 349 ppb_wdtr(bus, *buffer); 350 351 /* Event 9 */ 352 ppb_wctr(bus, (AUTOFEED | STROBE) & ~(nINIT | SELECTIN)); 353 354 /* Event 10 - wait data read */ 355 if ((error = do_peripheral_wait(bus, nBUSY, 0))) { 356 ppb_1284_set_error(bus, PPB_TIMEOUT, 16); 357 goto error; 358 } 359 360 /* Event 11 */ 361 if (!last) { 362 ppb_wctr(bus, (AUTOFEED) & ~(nINIT | STROBE | SELECTIN)); 363 } else { 364 ppb_wctr(bus, (nINIT) & ~(STROBE | SELECTIN | AUTOFEED)); 365 } 366 367#if 0 368 /* Event 16 - wait strobe */ 369 if ((error = do_peripheral_wait(bus, nACK | nBUSY, 0))) { 370 ppb_1284_set_error(bus, PPB_TIMEOUT, 16); 371 goto error; 372 } 373#endif 374 375 /* check termination */ 376 if (!(ppb_rstr(bus) & SELECT)) { 377 ppb_peripheral_terminate(bus, PPB_WAIT); 378 goto error; 379 } 380 381error: 382 return (error); 383} 384 385/* 386 * byte_peripheral_write() 387 * 388 * Write n bytes in BYTE mode 389 */ 390int 391byte_peripheral_write(device_t bus, char *buffer, int len, int *sent) 392{ 393 int error = 0, i; 394 char r; 395 396 ppb_1284_set_state(bus, PPB_PERIPHERAL_TRANSFER); 397 398 /* wait forever, the remote host is master and should initiate 399 * termination 400 */ 401 for (i=0; i<len; i++) { 402 /* force remote nFAULT low to release the remote waiting 403 * process, if any 404 */ 405 r = ppb_rctr(bus); 406 ppb_wctr(bus, r & ~nINIT); 407 408#ifdef DEBUG_1284 409 printf("y"); 410#endif 411 /* Event 7 */ 412 error = ppb_poll_bus(bus, PPB_FOREVER, nBUSY, nBUSY, 413 PPB_INTR); 414 415 if (error && error != EWOULDBLOCK) 416 goto error; 417 418#ifdef DEBUG_1284 419 printf("b"); 420#endif 421 if ((error = byte_peripheral_outbyte(bus, buffer+i, (i == len-1)))) 422 goto error; 423 } 424error: 425 if (!error) 426 ppb_1284_set_state(bus, PPB_PERIPHERAL_IDLE); 427 428 *sent = i; 429 return (error); 430} 431 432/* 433 * byte_1284_inbyte() 434 * 435 * Read 1 byte in BYTE mode 436 */ 437int 438byte_1284_inbyte(device_t bus, char *buffer) 439{ 440 int error = 0; 441 442 /* Event 7 - ready to take data (nAUTO low) */ 443 ppb_wctr(bus, (PCD | nINIT | AUTOFEED) & ~(STROBE | SELECTIN)); 444 445 /* Event 9 - peripheral set nAck low */ 446 if ((error = do_1284_wait(bus, nACK, 0))) { 447 ppb_1284_set_error(bus, PPB_TIMEOUT, 9); 448 goto error; 449 } 450 451 /* read the byte */ 452 *buffer = ppb_rdtr(bus); 453 454 /* Event 10 - data received, can't accept more */ 455 ppb_wctr(bus, (nINIT) & ~(AUTOFEED | STROBE | SELECTIN)); 456 457 /* Event 11 - peripheral ack */ 458 if ((error = do_1284_wait(bus, nACK, nACK))) { 459 ppb_1284_set_error(bus, PPB_TIMEOUT, 11); 460 goto error; 461 } 462 463 /* Event 16 - strobe */ 464 ppb_wctr(bus, (nINIT | STROBE) & ~(AUTOFEED | SELECTIN)); 465 DELAY(3); 466 ppb_wctr(bus, (nINIT) & ~(AUTOFEED | STROBE | SELECTIN)); 467 468error: 469 return (error); 470} 471 472/* 473 * nibble_1284_inbyte() 474 * 475 * Read 1 byte in NIBBLE mode 476 */ 477int 478nibble_1284_inbyte(device_t bus, char *buffer) 479{ 480 char nibble[2]; 481 int i, error; 482 483 for (i = 0; i < 2; i++) { 484 485 /* Event 7 - ready to take data (nAUTO low) */ 486 ppb_wctr(bus, (nINIT | AUTOFEED) & ~(STROBE | SELECTIN)); 487 488 /* Event 8 - peripheral writes the first nibble */ 489 490 /* Event 9 - peripheral set nAck low */ 491 if ((error = do_1284_wait(bus, nACK, 0))) { 492 ppb_1284_set_error(bus, PPB_TIMEOUT, 9); 493 goto error; 494 } 495 496 /* read nibble */ 497 nibble[i] = ppb_rstr(bus); 498 499 /* Event 10 - ack, nibble received */ 500 ppb_wctr(bus, nINIT & ~(AUTOFEED | STROBE | SELECTIN)); 501 502 /* Event 11 - wait ack from peripherial */ 503 if ((error = do_1284_wait(bus, nACK, nACK))) { 504 ppb_1284_set_error(bus, PPB_TIMEOUT, 11); 505 goto error; 506 } 507 } 508 509 *buffer = ((nibble2char(nibble[1]) << 4) & 0xf0) | 510 (nibble2char(nibble[0]) & 0x0f); 511 512error: 513 return (error); 514} 515 516/* 517 * spp_1284_read() 518 * 519 * Read in IEEE1284 NIBBLE/BYTE mode 520 */ 521int 522spp_1284_read(device_t bus, int mode, char *buffer, int max, int *read) 523{ 524 int error = 0, len = 0; 525 int terminate_after_transfer = 1; 526 int state; 527 528 *read = len = 0; 529 530 state = ppb_1284_get_state(bus); 531 532 switch (state) { 533 case PPB_FORWARD_IDLE: 534 if ((error = ppb_1284_negociate(bus, mode, 0))) 535 return (error); 536 break; 537 538 case PPB_REVERSE_IDLE: 539 terminate_after_transfer = 0; 540 break; 541 542 default: 543 ppb_1284_terminate(bus); 544 if ((error = ppb_1284_negociate(bus, mode, 0))) 545 return (error); 546 break; 547 } 548 549 while ((len < max) && !(ppb_rstr(bus) & (nFAULT))) { 550 551 ppb_1284_set_state(bus, PPB_REVERSE_TRANSFER); 552 553#ifdef DEBUG_1284 554 printf("B"); 555#endif 556 557 switch (mode) { 558 case PPB_NIBBLE: 559 /* read a byte, error means no more data */ 560 if (nibble_1284_inbyte(bus, buffer+len)) 561 goto end_while; 562 break; 563 case PPB_BYTE: 564 if (byte_1284_inbyte(bus, buffer+len)) 565 goto end_while; 566 break; 567 default: 568 error = EINVAL; 569 goto end_while; 570 } 571 len ++; 572 } 573end_while: 574 575 if (!error) 576 ppb_1284_set_state(bus, PPB_REVERSE_IDLE); 577 578 *read = len; 579 580 if (terminate_after_transfer || error) 581 ppb_1284_terminate(bus); 582 583 return (error); 584} 585 586/* 587 * ppb_1284_read_id() 588 * 589 */ 590int 591ppb_1284_read_id(device_t bus, int mode, char *buffer, 592 int max, int *read) 593{ 594 int error = 0; 595 596 /* fill the buffer with 0s */ 597 bzero(buffer, max); 598 599 switch (mode) { 600 case PPB_NIBBLE: 601 case PPB_ECP: 602 if ((error = ppb_1284_negociate(bus, PPB_NIBBLE, PPB_REQUEST_ID))) 603 return (error); 604 error = spp_1284_read(bus, PPB_NIBBLE, buffer, max, read); 605 break; 606 case PPB_BYTE: 607 if ((error = ppb_1284_negociate(bus, PPB_BYTE, PPB_REQUEST_ID))) 608 return (error); 609 error = spp_1284_read(bus, PPB_BYTE, buffer, max, read); 610 break; 611 default: 612 panic("%s: unsupported mode %d\n", __func__, mode); 613 } 614 615 ppb_1284_terminate(bus); 616 return (error); 617} 618 619/* 620 * ppb_1284_read() 621 * 622 * IEEE1284 read 623 */ 624int 625ppb_1284_read(device_t bus, int mode, char *buffer, 626 int max, int *read) 627{ 628 int error = 0; 629 630 switch (mode) { 631 case PPB_NIBBLE: 632 case PPB_BYTE: 633 error = spp_1284_read(bus, mode, buffer, max, read); 634 break; 635 default: 636 return (EINVAL); 637 } 638 639 return (error); 640} 641 642/* 643 * ppb_1284_negociate() 644 * 645 * IEEE1284 negociation phase 646 * 647 * Normal nibble mode or request device id mode (see ppb_1284.h) 648 * 649 * After negociation, nFAULT is low if data is available 650 */ 651int 652ppb_1284_negociate(device_t bus, int mode, int options) 653{ 654 int error; 655 int request_mode; 656 657#ifdef DEBUG_1284 658 printf("n"); 659#endif 660 661 if (ppb_1284_get_state(bus) >= PPB_PERIPHERAL_NEGOCIATION) 662 ppb_peripheral_terminate(bus, PPB_WAIT); 663 664 if (ppb_1284_get_state(bus) != PPB_FORWARD_IDLE) 665 ppb_1284_terminate(bus); 666 667#ifdef DEBUG_1284 668 printf("%d", mode); 669#endif 670 671 /* ensure the host is in compatible mode */ 672 ppb_set_mode(bus, PPB_COMPATIBLE); 673 674 /* reset error to catch the actual negociation error */ 675 ppb_1284_reset_error(bus, PPB_FORWARD_IDLE); 676 677 /* calculate ext. value */ 678 request_mode = ppb_request_mode(mode, options); 679 680 /* default state */ 681 ppb_wctr(bus, (nINIT | SELECTIN) & ~(STROBE | AUTOFEED)); 682 DELAY(1); 683 684 /* enter negociation phase */ 685 ppb_1284_set_state(bus, PPB_NEGOCIATION); 686 687 /* Event 0 - put the exten. value on the data lines */ 688 ppb_wdtr(bus, request_mode); 689 690#ifdef PERIPH_1284 691 /* request remote host attention */ 692 ppb_wctr(bus, (nINIT | STROBE) & ~(AUTOFEED | SELECTIN)); 693 DELAY(1); 694 ppb_wctr(bus, (nINIT) & ~(STROBE | AUTOFEED | SELECTIN)); 695#else 696 DELAY(1); 697 698#endif /* !PERIPH_1284 */ 699 700 /* Event 1 - enter IEEE1284 mode */ 701 ppb_wctr(bus, (nINIT | AUTOFEED) & ~(STROBE | SELECTIN)); 702 703#ifdef PERIPH_1284 704 /* ignore the PError line, wait a bit more, remote host's 705 * interrupts don't respond fast enough */ 706 if (ppb_poll_bus(bus, 40, nACK | SELECT | nFAULT, 707 SELECT | nFAULT, PPB_NOINTR | PPB_POLL)) { 708 ppb_1284_set_error(bus, PPB_NOT_IEEE1284, 2); 709 error = ENODEV; 710 goto error; 711 } 712#else 713 /* Event 2 - trying IEEE1284 dialog */ 714 if (do_1284_wait(bus, nACK | PERROR | SELECT | nFAULT, 715 PERROR | SELECT | nFAULT)) { 716 ppb_1284_set_error(bus, PPB_NOT_IEEE1284, 2); 717 error = ENODEV; 718 goto error; 719 } 720#endif /* !PERIPH_1284 */ 721 722 /* Event 3 - latch the ext. value to the peripheral */ 723 ppb_wctr(bus, (nINIT | STROBE | AUTOFEED) & ~SELECTIN); 724 DELAY(1); 725 726 /* Event 4 - IEEE1284 device recognized */ 727 ppb_wctr(bus, nINIT & ~(SELECTIN | AUTOFEED | STROBE)); 728 729 /* Event 6 - waiting for status lines */ 730 if (do_1284_wait(bus, nACK, nACK)) { 731 ppb_1284_set_error(bus, PPB_TIMEOUT, 6); 732 error = EBUSY; 733 goto error; 734 } 735 736 /* Event 7 - quering result consider nACK not to misunderstand 737 * a remote computer terminate sequence */ 738 if (options & PPB_EXTENSIBILITY_LINK) { 739 740 /* XXX not fully supported yet */ 741 ppb_1284_terminate(bus); 742 return (0); 743 744 } 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 /* negociation 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 801error: 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 */ 813int 814ppb_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 occured 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 853error: 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