ppb_1284.c revision 185003
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 185003 2008-11-16 17:42:02Z jhb $"); 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 96 return (DEVTOSOFTC(bus)->state); 97} 98 99/* 100 * ppb_1284_set_state() 101 * 102 * Change IEEE1284 state if no error occured 103 */ 104int 105ppb_1284_set_state(device_t bus, int state) 106{ 107 struct ppb_data *ppb = DEVTOSOFTC(bus); 108 109 /* call ppb_1284_reset_error() if you absolutly want to change 110 * the state from PPB_ERROR to another */ 111 if ((ppb->state != PPB_ERROR) && 112 (ppb->error == PPB_NO_ERROR)) { 113 ppb->state = state; 114 ppb->error = PPB_NO_ERROR; 115 } 116 117 return (0); 118} 119 120static int 121ppb_1284_set_error(device_t bus, int error, int event) 122{ 123 struct ppb_data *ppb = DEVTOSOFTC(bus); 124 125 /* do not accumulate errors */ 126 if ((ppb->error == PPB_NO_ERROR) && 127 (ppb->state != PPB_ERROR)) { 128 ppb->error = error; 129 ppb->state = PPB_ERROR; 130 } 131 132#ifdef DEBUG_1284 133 printf("ppb1284: error=%d status=0x%x event=%d\n", error, 134 ppb_rstr(bus) & 0xff, event); 135#endif 136 137 return (0); 138} 139 140/* 141 * ppb_request_mode() 142 * 143 * Converts mode+options into ext. value 144 */ 145static int 146ppb_request_mode(int mode, int options) 147{ 148 int request_mode = 0; 149 150 if (options & PPB_EXTENSIBILITY_LINK) { 151 request_mode = EXT_LINK_1284_NORMAL; 152 153 } else { 154 switch (mode) { 155 case PPB_NIBBLE: 156 request_mode = (options & PPB_REQUEST_ID) ? 157 NIBBLE_1284_REQUEST_ID : 158 NIBBLE_1284_NORMAL; 159 break; 160 case PPB_PS2: 161 request_mode = (options & PPB_REQUEST_ID) ? 162 BYTE_1284_REQUEST_ID : 163 BYTE_1284_NORMAL; 164 break; 165 case PPB_ECP: 166 if (options & PPB_USE_RLE) 167 request_mode = (options & PPB_REQUEST_ID) ? 168 ECP_1284_RLE_REQUEST_ID : 169 ECP_1284_RLE; 170 else 171 request_mode = (options & PPB_REQUEST_ID) ? 172 ECP_1284_REQUEST_ID : 173 ECP_1284_NORMAL; 174 break; 175 case PPB_EPP: 176 request_mode = EPP_1284_NORMAL; 177 break; 178 default: 179 panic("%s: unsupported mode %d\n", __func__, mode); 180 } 181 } 182 183 return (request_mode); 184} 185 186/* 187 * ppb_peripheral_negociate() 188 * 189 * Negociate the peripheral side 190 */ 191int 192ppb_peripheral_negociate(device_t bus, int mode, int options) 193{ 194 int spin, request_mode, error = 0; 195 char r; 196 197 ppb_set_mode(bus, PPB_COMPATIBLE); 198 ppb_1284_set_state(bus, PPB_PERIPHERAL_NEGOCIATION); 199 200 /* compute ext. value */ 201 request_mode = ppb_request_mode(mode, options); 202 203 /* wait host */ 204 spin = 10; 205 while (spin-- && (ppb_rstr(bus) & nBUSY)) 206 DELAY(1); 207 208 /* check termination */ 209 if (!(ppb_rstr(bus) & SELECT) || !spin) { 210 error = ENODEV; 211 goto error; 212 } 213 214 /* Event 4 - read ext. value */ 215 r = ppb_rdtr(bus); 216 217 /* nibble mode is not supported */ 218 if ((r == (char)request_mode) || 219 (r == NIBBLE_1284_NORMAL)) { 220 221 /* Event 5 - restore direction bit, no data avail */ 222 ppb_wctr(bus, (STROBE | nINIT) & ~(SELECTIN)); 223 DELAY(1); 224 225 /* Event 6 */ 226 ppb_wctr(bus, (nINIT) & ~(SELECTIN | STROBE)); 227 228 if (r == NIBBLE_1284_NORMAL) { 229#ifdef DEBUG_1284 230 printf("R"); 231#endif 232 ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 4); 233 error = EINVAL; 234 goto error; 235 } else { 236 ppb_1284_set_state(bus, PPB_PERIPHERAL_IDLE); 237 switch (r) { 238 case BYTE_1284_NORMAL: 239 ppb_set_mode(bus, PPB_BYTE); 240 break; 241 default: 242 break; 243 } 244#ifdef DEBUG_1284 245 printf("A"); 246#endif 247 /* negociation succeeds */ 248 } 249 } else { 250 /* Event 5 - mode not supported */ 251 ppb_wctr(bus, SELECTIN); 252 DELAY(1); 253 254 /* Event 6 */ 255 ppb_wctr(bus, (SELECTIN) & ~(STROBE | nINIT)); 256 ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 4); 257 258#ifdef DEBUG_1284 259 printf("r"); 260#endif 261 error = EINVAL; 262 goto error; 263 } 264 265 return (0); 266 267error: 268 ppb_peripheral_terminate(bus, PPB_WAIT); 269 return (error); 270} 271 272/* 273 * ppb_peripheral_terminate() 274 * 275 * Terminate peripheral transfer side 276 * 277 * Always return 0 in compatible mode 278 */ 279int 280ppb_peripheral_terminate(device_t bus, int how) 281{ 282 int error = 0; 283 284#ifdef DEBUG_1284 285 printf("t"); 286#endif 287 288 ppb_1284_set_state(bus, PPB_PERIPHERAL_TERMINATION); 289 290 /* Event 22 - wait up to host response time (1s) */ 291 if ((error = do_peripheral_wait(bus, SELECT | nBUSY, 0))) { 292 ppb_1284_set_error(bus, PPB_TIMEOUT, 22); 293 goto error; 294 } 295 296 /* Event 24 */ 297 ppb_wctr(bus, (nINIT | STROBE) & ~(AUTOFEED | SELECTIN)); 298 299 /* Event 25 - wait up to host response time (1s) */ 300 if ((error = do_peripheral_wait(bus, nBUSY, nBUSY))) { 301 ppb_1284_set_error(bus, PPB_TIMEOUT, 25); 302 goto error; 303 } 304 305 /* Event 26 */ 306 ppb_wctr(bus, (SELECTIN | nINIT | STROBE) & ~(AUTOFEED)); 307 DELAY(1); 308 /* Event 27 */ 309 ppb_wctr(bus, (SELECTIN | nINIT) & ~(STROBE | AUTOFEED)); 310 311 /* Event 28 - wait up to host response time (1s) */ 312 if ((error = do_peripheral_wait(bus, nBUSY, 0))) { 313 ppb_1284_set_error(bus, PPB_TIMEOUT, 28); 314 goto error; 315 } 316 317error: 318 ppb_set_mode(bus, PPB_COMPATIBLE); 319 ppb_1284_set_state(bus, PPB_FORWARD_IDLE); 320 321 return (0); 322} 323 324/* 325 * byte_peripheral_outbyte() 326 * 327 * Write 1 byte in BYTE mode 328 */ 329static int 330byte_peripheral_outbyte(device_t bus, char *buffer, int last) 331{ 332 int error = 0; 333 334 /* Event 7 */ 335 if ((error = do_1284_wait(bus, nBUSY, nBUSY))) { 336 ppb_1284_set_error(bus, PPB_TIMEOUT, 7); 337 goto error; 338 } 339 340 /* check termination */ 341 if (!(ppb_rstr(bus) & SELECT)) { 342 ppb_peripheral_terminate(bus, PPB_WAIT); 343 goto error; 344 } 345 346 /* Event 15 - put byte on data lines */ 347#ifdef DEBUG_1284 348 printf("B"); 349#endif 350 ppb_wdtr(bus, *buffer); 351 352 /* Event 9 */ 353 ppb_wctr(bus, (AUTOFEED | STROBE) & ~(nINIT | SELECTIN)); 354 355 /* Event 10 - wait data read */ 356 if ((error = do_peripheral_wait(bus, nBUSY, 0))) { 357 ppb_1284_set_error(bus, PPB_TIMEOUT, 16); 358 goto error; 359 } 360 361 /* Event 11 */ 362 if (!last) { 363 ppb_wctr(bus, (AUTOFEED) & ~(nINIT | STROBE | SELECTIN)); 364 } else { 365 ppb_wctr(bus, (nINIT) & ~(STROBE | SELECTIN | AUTOFEED)); 366 } 367 368#if 0 369 /* Event 16 - wait strobe */ 370 if ((error = do_peripheral_wait(bus, nACK | nBUSY, 0))) { 371 ppb_1284_set_error(bus, PPB_TIMEOUT, 16); 372 goto error; 373 } 374#endif 375 376 /* check termination */ 377 if (!(ppb_rstr(bus) & SELECT)) { 378 ppb_peripheral_terminate(bus, PPB_WAIT); 379 goto error; 380 } 381 382error: 383 return (error); 384} 385 386/* 387 * byte_peripheral_write() 388 * 389 * Write n bytes in BYTE mode 390 */ 391int 392byte_peripheral_write(device_t bus, char *buffer, int len, int *sent) 393{ 394 int error = 0, i; 395 char r; 396 397 ppb_1284_set_state(bus, PPB_PERIPHERAL_TRANSFER); 398 399 /* wait forever, the remote host is master and should initiate 400 * termination 401 */ 402 for (i=0; i<len; i++) { 403 /* force remote nFAULT low to release the remote waiting 404 * process, if any 405 */ 406 r = ppb_rctr(bus); 407 ppb_wctr(bus, r & ~nINIT); 408 409#ifdef DEBUG_1284 410 printf("y"); 411#endif 412 /* Event 7 */ 413 error = ppb_poll_bus(bus, PPB_FOREVER, nBUSY, nBUSY, 414 PPB_INTR); 415 416 if (error && error != EWOULDBLOCK) 417 goto error; 418 419#ifdef DEBUG_1284 420 printf("b"); 421#endif 422 if ((error = byte_peripheral_outbyte(bus, buffer+i, (i == len-1)))) 423 goto error; 424 } 425error: 426 if (!error) 427 ppb_1284_set_state(bus, PPB_PERIPHERAL_IDLE); 428 429 *sent = i; 430 return (error); 431} 432 433/* 434 * byte_1284_inbyte() 435 * 436 * Read 1 byte in BYTE mode 437 */ 438int 439byte_1284_inbyte(device_t bus, char *buffer) 440{ 441 int error = 0; 442 443 /* Event 7 - ready to take data (nAUTO low) */ 444 ppb_wctr(bus, (PCD | nINIT | AUTOFEED) & ~(STROBE | SELECTIN)); 445 446 /* Event 9 - peripheral set nAck low */ 447 if ((error = do_1284_wait(bus, nACK, 0))) { 448 ppb_1284_set_error(bus, PPB_TIMEOUT, 9); 449 goto error; 450 } 451 452 /* read the byte */ 453 *buffer = ppb_rdtr(bus); 454 455 /* Event 10 - data received, can't accept more */ 456 ppb_wctr(bus, (nINIT) & ~(AUTOFEED | STROBE | SELECTIN)); 457 458 /* Event 11 - peripheral ack */ 459 if ((error = do_1284_wait(bus, nACK, nACK))) { 460 ppb_1284_set_error(bus, PPB_TIMEOUT, 11); 461 goto error; 462 } 463 464 /* Event 16 - strobe */ 465 ppb_wctr(bus, (nINIT | STROBE) & ~(AUTOFEED | SELECTIN)); 466 DELAY(3); 467 ppb_wctr(bus, (nINIT) & ~(AUTOFEED | STROBE | SELECTIN)); 468 469error: 470 return (error); 471} 472 473/* 474 * nibble_1284_inbyte() 475 * 476 * Read 1 byte in NIBBLE mode 477 */ 478int 479nibble_1284_inbyte(device_t bus, char *buffer) 480{ 481 char nibble[2]; 482 int i, error; 483 484 for (i = 0; i < 2; i++) { 485 486 /* Event 7 - ready to take data (nAUTO low) */ 487 ppb_wctr(bus, (nINIT | AUTOFEED) & ~(STROBE | SELECTIN)); 488 489 /* Event 8 - peripheral writes the first nibble */ 490 491 /* Event 9 - peripheral set nAck low */ 492 if ((error = do_1284_wait(bus, nACK, 0))) { 493 ppb_1284_set_error(bus, PPB_TIMEOUT, 9); 494 goto error; 495 } 496 497 /* read nibble */ 498 nibble[i] = ppb_rstr(bus); 499 500 /* Event 10 - ack, nibble received */ 501 ppb_wctr(bus, nINIT & ~(AUTOFEED | STROBE | SELECTIN)); 502 503 /* Event 11 - wait ack from peripherial */ 504 if ((error = do_1284_wait(bus, nACK, nACK))) { 505 ppb_1284_set_error(bus, PPB_TIMEOUT, 11); 506 goto error; 507 } 508 } 509 510 *buffer = ((nibble2char(nibble[1]) << 4) & 0xf0) | 511 (nibble2char(nibble[0]) & 0x0f); 512 513error: 514 return (error); 515} 516 517/* 518 * spp_1284_read() 519 * 520 * Read in IEEE1284 NIBBLE/BYTE mode 521 */ 522int 523spp_1284_read(device_t bus, int mode, char *buffer, int max, int *read) 524{ 525 int error = 0, len = 0; 526 int terminate_after_transfer = 1; 527 int state; 528 529 *read = len = 0; 530 531 state = ppb_1284_get_state(bus); 532 533 switch (state) { 534 case PPB_FORWARD_IDLE: 535 if ((error = ppb_1284_negociate(bus, mode, 0))) 536 return (error); 537 break; 538 539 case PPB_REVERSE_IDLE: 540 terminate_after_transfer = 0; 541 break; 542 543 default: 544 ppb_1284_terminate(bus); 545 if ((error = ppb_1284_negociate(bus, mode, 0))) 546 return (error); 547 break; 548 } 549 550 while ((len < max) && !(ppb_rstr(bus) & (nFAULT))) { 551 552 ppb_1284_set_state(bus, PPB_REVERSE_TRANSFER); 553 554#ifdef DEBUG_1284 555 printf("B"); 556#endif 557 558 switch (mode) { 559 case PPB_NIBBLE: 560 /* read a byte, error means no more data */ 561 if (nibble_1284_inbyte(bus, buffer+len)) 562 goto end_while; 563 break; 564 case PPB_BYTE: 565 if (byte_1284_inbyte(bus, buffer+len)) 566 goto end_while; 567 break; 568 default: 569 error = EINVAL; 570 goto end_while; 571 } 572 len ++; 573 } 574end_while: 575 576 if (!error) 577 ppb_1284_set_state(bus, PPB_REVERSE_IDLE); 578 579 *read = len; 580 581 if (terminate_after_transfer || error) 582 ppb_1284_terminate(bus); 583 584 return (error); 585} 586 587/* 588 * ppb_1284_read_id() 589 * 590 */ 591int 592ppb_1284_read_id(device_t bus, int mode, char *buffer, 593 int max, int *read) 594{ 595 int error = 0; 596 597 /* fill the buffer with 0s */ 598 bzero(buffer, max); 599 600 switch (mode) { 601 case PPB_NIBBLE: 602 case PPB_ECP: 603 if ((error = ppb_1284_negociate(bus, PPB_NIBBLE, PPB_REQUEST_ID))) 604 return (error); 605 error = spp_1284_read(bus, PPB_NIBBLE, buffer, max, read); 606 break; 607 case PPB_BYTE: 608 if ((error = ppb_1284_negociate(bus, PPB_BYTE, PPB_REQUEST_ID))) 609 return (error); 610 error = spp_1284_read(bus, PPB_BYTE, buffer, max, read); 611 break; 612 default: 613 panic("%s: unsupported mode %d\n", __func__, mode); 614 } 615 616 ppb_1284_terminate(bus); 617 return (error); 618} 619 620/* 621 * ppb_1284_read() 622 * 623 * IEEE1284 read 624 */ 625int 626ppb_1284_read(device_t bus, int mode, char *buffer, 627 int max, int *read) 628{ 629 int error = 0; 630 631 switch (mode) { 632 case PPB_NIBBLE: 633 case PPB_BYTE: 634 error = spp_1284_read(bus, mode, buffer, max, read); 635 break; 636 default: 637 return (EINVAL); 638 } 639 640 return (error); 641} 642 643/* 644 * ppb_1284_negociate() 645 * 646 * IEEE1284 negociation phase 647 * 648 * Normal nibble mode or request device id mode (see ppb_1284.h) 649 * 650 * After negociation, nFAULT is low if data is available 651 */ 652int 653ppb_1284_negociate(device_t bus, int mode, int options) 654{ 655 int error; 656 int request_mode; 657 658#ifdef DEBUG_1284 659 printf("n"); 660#endif 661 662 if (ppb_1284_get_state(bus) >= PPB_PERIPHERAL_NEGOCIATION) 663 ppb_peripheral_terminate(bus, PPB_WAIT); 664 665 if (ppb_1284_get_state(bus) != PPB_FORWARD_IDLE) 666 ppb_1284_terminate(bus); 667 668#ifdef DEBUG_1284 669 printf("%d", mode); 670#endif 671 672 /* ensure the host is in compatible mode */ 673 ppb_set_mode(bus, PPB_COMPATIBLE); 674 675 /* reset error to catch the actual negociation error */ 676 ppb_1284_reset_error(bus, PPB_FORWARD_IDLE); 677 678 /* calculate ext. value */ 679 request_mode = ppb_request_mode(mode, options); 680 681 /* default state */ 682 ppb_wctr(bus, (nINIT | SELECTIN) & ~(STROBE | AUTOFEED)); 683 DELAY(1); 684 685 /* enter negociation phase */ 686 ppb_1284_set_state(bus, PPB_NEGOCIATION); 687 688 /* Event 0 - put the exten. value on the data lines */ 689 ppb_wdtr(bus, request_mode); 690 691#ifdef PERIPH_1284 692 /* request remote host attention */ 693 ppb_wctr(bus, (nINIT | STROBE) & ~(AUTOFEED | SELECTIN)); 694 DELAY(1); 695 ppb_wctr(bus, (nINIT) & ~(STROBE | AUTOFEED | SELECTIN)); 696#else 697 DELAY(1); 698 699#endif /* !PERIPH_1284 */ 700 701 /* Event 1 - enter IEEE1284 mode */ 702 ppb_wctr(bus, (nINIT | AUTOFEED) & ~(STROBE | SELECTIN)); 703 704#ifdef PERIPH_1284 705 /* ignore the PError line, wait a bit more, remote host's 706 * interrupts don't respond fast enough */ 707 if (ppb_poll_bus(bus, 40, nACK | SELECT | nFAULT, 708 SELECT | nFAULT, PPB_NOINTR | PPB_POLL)) { 709 ppb_1284_set_error(bus, PPB_NOT_IEEE1284, 2); 710 error = ENODEV; 711 goto error; 712 } 713#else 714 /* Event 2 - trying IEEE1284 dialog */ 715 if (do_1284_wait(bus, nACK | PERROR | SELECT | nFAULT, 716 PERROR | SELECT | nFAULT)) { 717 ppb_1284_set_error(bus, PPB_NOT_IEEE1284, 2); 718 error = ENODEV; 719 goto error; 720 } 721#endif /* !PERIPH_1284 */ 722 723 /* Event 3 - latch the ext. value to the peripheral */ 724 ppb_wctr(bus, (nINIT | STROBE | AUTOFEED) & ~SELECTIN); 725 DELAY(1); 726 727 /* Event 4 - IEEE1284 device recognized */ 728 ppb_wctr(bus, nINIT & ~(SELECTIN | AUTOFEED | STROBE)); 729 730 /* Event 6 - waiting for status lines */ 731 if (do_1284_wait(bus, nACK, nACK)) { 732 ppb_1284_set_error(bus, PPB_TIMEOUT, 6); 733 error = EBUSY; 734 goto error; 735 } 736 737 /* Event 7 - quering result consider nACK not to misunderstand 738 * a remote computer terminate sequence */ 739 if (options & PPB_EXTENSIBILITY_LINK) { 740 741 /* XXX not fully supported yet */ 742 ppb_1284_terminate(bus); 743 return (0); 744 745 } 746 if (request_mode == NIBBLE_1284_NORMAL) { 747 if (do_1284_wait(bus, nACK | SELECT, nACK)) { 748 ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 7); 749 error = ENODEV; 750 goto error; 751 } 752 } else { 753 if (do_1284_wait(bus, nACK | SELECT, SELECT | nACK)) { 754 ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 7); 755 error = ENODEV; 756 goto error; 757 } 758 } 759 760 switch (mode) { 761 case PPB_NIBBLE: 762 case PPB_PS2: 763 /* enter reverse idle phase */ 764 ppb_1284_set_state(bus, PPB_REVERSE_IDLE); 765 break; 766 case PPB_ECP: 767 /* negociation ok, now setup the communication */ 768 ppb_1284_set_state(bus, PPB_SETUP); 769 ppb_wctr(bus, (nINIT | AUTOFEED) & ~(SELECTIN | STROBE)); 770 771#ifdef PERIPH_1284 772 /* ignore PError line */ 773 if (do_1284_wait(bus, nACK | SELECT | nBUSY, 774 nACK | SELECT | nBUSY)) { 775 ppb_1284_set_error(bus, PPB_TIMEOUT, 30); 776 error = ENODEV; 777 goto error; 778 } 779#else 780 if (do_1284_wait(bus, nACK | SELECT | PERROR | nBUSY, 781 nACK | SELECT | PERROR | nBUSY)) { 782 ppb_1284_set_error(bus, PPB_TIMEOUT, 30); 783 error = ENODEV; 784 goto error; 785 } 786#endif /* !PERIPH_1284 */ 787 788 /* ok, the host enters the ForwardIdle state */ 789 ppb_1284_set_state(bus, PPB_ECP_FORWARD_IDLE); 790 break; 791 case PPB_EPP: 792 ppb_1284_set_state(bus, PPB_EPP_IDLE); 793 break; 794 795 default: 796 panic("%s: unknown mode (%d)!", __func__, mode); 797 } 798 ppb_set_mode(bus, mode); 799 800 return (0); 801 802error: 803 ppb_1284_terminate(bus); 804 805 return (error); 806} 807 808/* 809 * ppb_1284_terminate() 810 * 811 * IEEE1284 termination phase, return code should ignored since the host 812 * is _always_ in compatible mode after ppb_1284_terminate() 813 */ 814int 815ppb_1284_terminate(device_t bus) 816{ 817 818#ifdef DEBUG_1284 819 printf("T"); 820#endif 821 822 /* do not reset error here to keep the error that 823 * may occured before the ppb_1284_terminate() call */ 824 ppb_1284_set_state(bus, PPB_TERMINATION); 825 826#ifdef PERIPH_1284 827 /* request remote host attention */ 828 ppb_wctr(bus, (nINIT | STROBE | SELECTIN) & ~(AUTOFEED)); 829 DELAY(1); 830#endif /* PERIPH_1284 */ 831 832 /* Event 22 - set nSelectin low and nAutoFeed high */ 833 ppb_wctr(bus, (nINIT | SELECTIN) & ~(STROBE | AUTOFEED)); 834 835 /* Event 24 - waiting for peripheral, Xflag ignored */ 836 if (do_1284_wait(bus, nACK | nBUSY | nFAULT, nFAULT)) { 837 ppb_1284_set_error(bus, PPB_TIMEOUT, 24); 838 goto error; 839 } 840 841 /* Event 25 - set nAutoFd low */ 842 ppb_wctr(bus, (nINIT | SELECTIN | AUTOFEED) & ~STROBE); 843 844 /* Event 26 - compatible mode status is set */ 845 846 /* Event 27 - peripheral set nAck high */ 847 if (do_1284_wait(bus, nACK, nACK)) { 848 ppb_1284_set_error(bus, PPB_TIMEOUT, 27); 849 } 850 851 /* Event 28 - end termination, return to idle phase */ 852 ppb_wctr(bus, (nINIT | SELECTIN) & ~(STROBE | AUTOFEED)); 853 854error: 855 /* return to compatible mode */ 856 ppb_set_mode(bus, PPB_COMPATIBLE); 857 ppb_1284_set_state(bus, PPB_FORWARD_IDLE); 858 859 return (0); 860} 861