sys/bus/ppbus/ppb_1284.c

   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  * $FreeBSD: src/sys/dev/ppbus/ppb_1284.c,v 1.11 2000/01/14 08:03:14 nsouch Exp $
  27  * $DragonFly: src/sys/bus/ppbus/ppb_1284.c,v 1.5 2006/12/22 23:12:17 swildner Exp $
  28  *
  29  */
  30
  31 /*
  32  * General purpose routines for the IEEE1284-1994 Standard
  33  */
  34
  35 #include "opt_ppb_1284.h"
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/bus.h>
  40
  41 #include <machine/clock.h>
  42
  43 #include "ppbconf.h"
  44 #include "ppb_1284.h"
  45
  46 #include "ppbus_if.h"
  47
  48 #include "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  */
  57 static int
  58 do_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
  63 static int
  64 do_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  */
  76 static int
  77 ppb_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  */
  92 int
  93 ppb_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  */
 103 int
 104 ppb_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
 119 static int
 120 ppb_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         kprintf("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  */
 144 static int
 145 ppb_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  */
 190 int
 191 ppb_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                         kprintf("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                         kprintf("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                 kprintf("r");
 259 #endif
 260                 error = EINVAL;
 261                 goto error;
 262         }
 263
 264         return (0);
 265
 266 error:
 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  */
 278 int
 279 ppb_peripheral_terminate(device_t bus, int how)
 280 {
 281         int error = 0;
 282
 283 #ifdef DEBUG_1284
 284         kprintf("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
 316 error:
 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  */
 328 static int
 329 byte_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         kprintf("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
 381 error:
 382         return (error);
 383 }
 384
 385 /*
 386  * byte_peripheral_write()
 387  *
 388  * Write n bytes in BYTE mode
 389  */
 390 int
 391 byte_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                 kprintf("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                 kprintf("b");
 420 #endif
 421                 if ((error = byte_peripheral_outbyte(bus, buffer+i, (i == len-1))))
 422                         goto error;
 423         }
 424 error:
 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  */
 437 int
 438 byte_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
 468 error:
 469         return (error);
 470 }
 471
 472 /*
 473  * nibble_1284_inbyte()
 474  *
 475  * Read 1 byte in NIBBLE mode
 476  */
 477 int
 478 nibble_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
 512 error:
 513         return (error);
 514 }
 515
 516 /*
 517  * spp_1284_read()
 518  *
 519  * Read in IEEE1284 NIBBLE/BYTE mode
 520  */
 521 int
 522 spp_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                 kprintf("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         }
 573 end_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  */
 590 int
 591 ppb_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  */
 624 int
 625 ppb_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  */
 651 int
 652 ppb_1284_negociate(device_t bus, int mode, int options)
 653 {
 654         int error;
 655         int request_mode;
 656
 657 #ifdef DEBUG_1284
 658         kprintf("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         kprintf("%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
 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         kprintf("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
 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 }