xref: /freebsd/sys/dev/ppbus/ppb_1284.c (revision 41466b50c1d5bfd1cf6adaae547a579a75d7c04e)
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  * $FreeBSD$
27  *
28  */
29 
30 /*
31  * General purpose routines for the IEEE1284-1994 Standard
32  */
33 
34 #include "opt_ppb_1284.h"
35 
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/bus.h>
39 
40 
41 #include <dev/ppbus/ppbconf.h>
42 #include <dev/ppbus/ppb_1284.h>
43 
44 #include "ppbus_if.h"
45 
46 #include <dev/ppbus/ppbio.h>
47 
48 #define DEVTOSOFTC(dev) ((struct ppb_data *)device_get_softc(dev))
49 
50 /*
51  * do_1284_wait()
52  *
53  * Wait for the peripherial up to 40ms
54  */
55 static int
56 do_1284_wait(device_t bus, char mask, char status)
57 {
58 	return (ppb_poll_bus(bus, 4, mask, status, PPB_NOINTR | PPB_POLL));
59 }
60 
61 static int
62 do_peripheral_wait(device_t bus, char mask, char status)
63 {
64 	return (ppb_poll_bus(bus, 100, mask, status, PPB_NOINTR | PPB_POLL));
65 }
66 
67 #define nibble2char(s) (((s & ~nACK) >> 3) | (~s & nBUSY) >> 4)
68 
69 /*
70  * ppb_1284_reset_error()
71  *
72  * Unconditionaly reset the error field
73  */
74 static int
75 ppb_1284_reset_error(device_t bus, int state)
76 {
77 	struct ppb_data *ppb = DEVTOSOFTC(bus);
78 
79 	ppb->error = PPB_NO_ERROR;
80 	ppb->state = state;
81 
82 	return (0);
83 }
84 
85 /*
86  * ppb_1284_get_state()
87  *
88  * Get IEEE1284 state
89  */
90 int
91 ppb_1284_get_state(device_t bus)
92 {
93         return (DEVTOSOFTC(bus)->state);
94 }
95 
96 /*
97  * ppb_1284_set_state()
98  *
99  * Change IEEE1284 state if no error occured
100  */
101 int
102 ppb_1284_set_state(device_t bus, int state)
103 {
104 	struct ppb_data *ppb = DEVTOSOFTC(bus);
105 
106 	/* call ppb_1284_reset_error() if you absolutly want to change
107 	 * the state from PPB_ERROR to another */
108 	if ((ppb->state != PPB_ERROR) &&
109 			(ppb->error == PPB_NO_ERROR)) {
110 		ppb->state = state;
111 		ppb->error = PPB_NO_ERROR;
112 	}
113 
114 	return (0);
115 }
116 
117 static int
118 ppb_1284_set_error(device_t bus, int error, int event)
119 {
120 	struct ppb_data *ppb = DEVTOSOFTC(bus);
121 
122 	/* do not accumulate errors */
123 	if ((ppb->error == PPB_NO_ERROR) &&
124 			(ppb->state != PPB_ERROR)) {
125 		ppb->error = error;
126 		ppb->state = PPB_ERROR;
127 	}
128 
129 #ifdef DEBUG_1284
130 	printf("ppb1284: error=%d status=0x%x event=%d\n", error,
131 		ppb_rstr(bus) & 0xff, event);
132 #endif
133 
134 	return (0);
135 }
136 
137 /*
138  * ppb_request_mode()
139  *
140  * Converts mode+options into ext. value
141  */
142 static int
143 ppb_request_mode(int mode, int options)
144 {
145 	int request_mode = 0;
146 
147 	if (options & PPB_EXTENSIBILITY_LINK) {
148 		request_mode = EXT_LINK_1284_NORMAL;
149 
150 	} else {
151 		switch (mode) {
152 		case PPB_NIBBLE:
153 			request_mode = (options & PPB_REQUEST_ID) ?
154 					NIBBLE_1284_REQUEST_ID :
155 					NIBBLE_1284_NORMAL;
156 			break;
157 		case PPB_PS2:
158 			request_mode = (options & PPB_REQUEST_ID) ?
159 					BYTE_1284_REQUEST_ID :
160 					BYTE_1284_NORMAL;
161 			break;
162 		case PPB_ECP:
163 			if (options & PPB_USE_RLE)
164 				request_mode = (options & PPB_REQUEST_ID) ?
165 					ECP_1284_RLE_REQUEST_ID :
166 					ECP_1284_RLE;
167 			else
168 				request_mode = (options & PPB_REQUEST_ID) ?
169 					ECP_1284_REQUEST_ID :
170 					ECP_1284_NORMAL;
171 			break;
172 		case PPB_EPP:
173 			request_mode = EPP_1284_NORMAL;
174 			break;
175 		default:
176 			panic("%s: unsupported mode %d\n", __FUNCTION__, mode);
177 		}
178 	}
179 
180 	return (request_mode);
181 }
182 
183 /*
184  * ppb_peripheral_negociate()
185  *
186  * Negociate the peripheral side
187  */
188 int
189 ppb_peripheral_negociate(device_t bus, int mode, int options)
190 {
191 	int spin, request_mode, error = 0;
192 	char r;
193 
194 	ppb_set_mode(bus, PPB_COMPATIBLE);
195 	ppb_1284_set_state(bus, PPB_PERIPHERAL_NEGOCIATION);
196 
197 	/* compute ext. value */
198 	request_mode = ppb_request_mode(mode, options);
199 
200 	/* wait host */
201 	spin = 10;
202 	while (spin-- && (ppb_rstr(bus) & nBUSY))
203 		DELAY(1);
204 
205 	/* check termination */
206 	if (!(ppb_rstr(bus) & SELECT) || !spin) {
207 		error = ENODEV;
208 		goto error;
209 	}
210 
211 	/* Event 4 - read ext. value */
212 	r = ppb_rdtr(bus);
213 
214 	/* nibble mode is not supported */
215 	if ((r == (char)request_mode) ||
216 			(r == NIBBLE_1284_NORMAL)) {
217 
218 		/* Event 5 - restore direction bit, no data avail */
219 		ppb_wctr(bus, (STROBE | nINIT) & ~(SELECTIN));
220 		DELAY(1);
221 
222 		/* Event 6 */
223 		ppb_wctr(bus, (nINIT) & ~(SELECTIN | STROBE));
224 
225 		if (r == NIBBLE_1284_NORMAL) {
226 #ifdef DEBUG_1284
227 			printf("R");
228 #endif
229 			ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 4);
230 			error = EINVAL;
231 			goto error;
232 		} else {
233 			ppb_1284_set_state(bus, PPB_PERIPHERAL_IDLE);
234 			switch (r) {
235 			case BYTE_1284_NORMAL:
236 				ppb_set_mode(bus, PPB_BYTE);
237 				break;
238 			default:
239 				break;
240 			}
241 #ifdef DEBUG_1284
242 			printf("A");
243 #endif
244 			/* negociation succeeds */
245 		}
246 	} else {
247 		/* Event 5 - mode not supported */
248 		ppb_wctr(bus, SELECTIN);
249 		DELAY(1);
250 
251 		/* Event 6 */
252 		ppb_wctr(bus, (SELECTIN) & ~(STROBE | nINIT));
253 		ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 4);
254 
255 #ifdef DEBUG_1284
256 		printf("r");
257 #endif
258 		error = EINVAL;
259 		goto error;
260 	}
261 
262 	return (0);
263 
264 error:
265 	ppb_peripheral_terminate(bus, PPB_WAIT);
266 	return (error);
267 }
268 
269 /*
270  * ppb_peripheral_terminate()
271  *
272  * Terminate peripheral transfer side
273  *
274  * Always return 0 in compatible mode
275  */
276 int
277 ppb_peripheral_terminate(device_t bus, int how)
278 {
279 	int error = 0;
280 
281 #ifdef DEBUG_1284
282 	printf("t");
283 #endif
284 
285 	ppb_1284_set_state(bus, PPB_PERIPHERAL_TERMINATION);
286 
287 	/* Event 22 - wait up to host response time (1s) */
288 	if ((error = do_peripheral_wait(bus, SELECT | nBUSY, 0))) {
289 		ppb_1284_set_error(bus, PPB_TIMEOUT, 22);
290 		goto error;
291 	}
292 
293 	/* Event 24 */
294         ppb_wctr(bus, (nINIT | STROBE) & ~(AUTOFEED | SELECTIN));
295 
296 	/* Event 25 - wait up to host response time (1s) */
297 	if ((error = do_peripheral_wait(bus, nBUSY, nBUSY))) {
298 		ppb_1284_set_error(bus, PPB_TIMEOUT, 25);
299 		goto error;
300 	}
301 
302 	/* Event 26 */
303         ppb_wctr(bus, (SELECTIN | nINIT | STROBE) & ~(AUTOFEED));
304 	DELAY(1);
305 	/* Event 27 */
306         ppb_wctr(bus, (SELECTIN | nINIT) & ~(STROBE | AUTOFEED));
307 
308 	/* Event 28 - wait up to host response time (1s) */
309 	if ((error = do_peripheral_wait(bus, nBUSY, 0))) {
310 		ppb_1284_set_error(bus, PPB_TIMEOUT, 28);
311 		goto error;
312 	}
313 
314 error:
315 	ppb_set_mode(bus, PPB_COMPATIBLE);
316 	ppb_1284_set_state(bus, PPB_FORWARD_IDLE);
317 
318 	return (0);
319 }
320 
321 /*
322  * byte_peripheral_outbyte()
323  *
324  * Write 1 byte in BYTE mode
325  */
326 static int
327 byte_peripheral_outbyte(device_t bus, char *buffer, int last)
328 {
329 	int error = 0;
330 
331 	/* Event 7 */
332 	if ((error = do_1284_wait(bus, nBUSY, nBUSY))) {
333 		ppb_1284_set_error(bus, PPB_TIMEOUT, 7);
334 		goto error;
335 	}
336 
337 	/* check termination */
338 	if (!(ppb_rstr(bus) & SELECT)) {
339 		ppb_peripheral_terminate(bus, PPB_WAIT);
340 		goto error;
341 	}
342 
343 	/* Event 15 - put byte on data lines */
344 #ifdef DEBUG_1284
345 	printf("B");
346 #endif
347 	ppb_wdtr(bus, *buffer);
348 
349 	/* Event 9 */
350 	ppb_wctr(bus, (AUTOFEED | STROBE) & ~(nINIT | SELECTIN));
351 
352 	/* Event 10 - wait data read */
353 	if ((error = do_peripheral_wait(bus, nBUSY, 0))) {
354 		ppb_1284_set_error(bus, PPB_TIMEOUT, 16);
355 		goto error;
356 	}
357 
358 	/* Event 11 */
359 	if (!last) {
360 		ppb_wctr(bus, (AUTOFEED) & ~(nINIT | STROBE | SELECTIN));
361 	} else {
362 		ppb_wctr(bus, (nINIT) & ~(STROBE | SELECTIN | AUTOFEED));
363 	}
364 
365 #if 0
366 	/* Event 16 - wait strobe */
367 	if ((error = do_peripheral_wait(bus, nACK | nBUSY, 0))) {
368 		ppb_1284_set_error(bus, PPB_TIMEOUT, 16);
369 		goto error;
370 	}
371 #endif
372 
373 	/* check termination */
374 	if (!(ppb_rstr(bus) & SELECT)) {
375 		ppb_peripheral_terminate(bus, PPB_WAIT);
376 		goto error;
377 	}
378 
379 error:
380 	return (error);
381 }
382 
383 /*
384  * byte_peripheral_write()
385  *
386  * Write n bytes in BYTE mode
387  */
388 int
389 byte_peripheral_write(device_t bus, char *buffer, int len, int *sent)
390 {
391 	int error = 0, i;
392 	char r;
393 
394 	ppb_1284_set_state(bus, PPB_PERIPHERAL_TRANSFER);
395 
396 	/* wait forever, the remote host is master and should initiate
397 	 * termination
398 	 */
399 	for (i=0; i<len; i++) {
400 		/* force remote nFAULT low to release the remote waiting
401 		 * process, if any
402 		 */
403 		r = ppb_rctr(bus);
404 		ppb_wctr(bus, r & ~nINIT);
405 
406 #ifdef DEBUG_1284
407 		printf("y");
408 #endif
409 		/* Event 7 */
410 		error = ppb_poll_bus(bus, PPB_FOREVER, nBUSY, nBUSY,
411 					PPB_INTR);
412 
413 		if (error && error != EWOULDBLOCK)
414 			goto error;
415 
416 #ifdef DEBUG_1284
417 		printf("b");
418 #endif
419 		if ((error = byte_peripheral_outbyte(bus, buffer+i, (i == len-1))))
420 			goto error;
421 	}
422 error:
423 	if (!error)
424 		ppb_1284_set_state(bus, PPB_PERIPHERAL_IDLE);
425 
426 	*sent = i;
427 	return (error);
428 }
429 
430 /*
431  * byte_1284_inbyte()
432  *
433  * Read 1 byte in BYTE mode
434  */
435 int
436 byte_1284_inbyte(device_t bus, char *buffer)
437 {
438 	int error = 0;
439 
440 	/* Event 7 - ready to take data (nAUTO low) */
441 	ppb_wctr(bus, (PCD | nINIT | AUTOFEED) & ~(STROBE | SELECTIN));
442 
443 	/* Event 9 - peripheral set nAck low */
444 	if ((error = do_1284_wait(bus, nACK, 0))) {
445 		ppb_1284_set_error(bus, PPB_TIMEOUT, 9);
446 		goto error;
447 	}
448 
449 	/* read the byte */
450 	*buffer = ppb_rdtr(bus);
451 
452 	/* Event 10 - data received, can't accept more */
453 	ppb_wctr(bus, (nINIT) & ~(AUTOFEED | STROBE | SELECTIN));
454 
455 	/* Event 11 - peripheral ack */
456 	if ((error = do_1284_wait(bus, nACK, nACK))) {
457 		ppb_1284_set_error(bus, PPB_TIMEOUT, 11);
458 		goto error;
459 	}
460 
461 	/* Event 16 - strobe */
462 	ppb_wctr(bus, (nINIT | STROBE) & ~(AUTOFEED | SELECTIN));
463 	DELAY(3);
464 	ppb_wctr(bus, (nINIT) & ~(AUTOFEED | STROBE | SELECTIN));
465 
466 error:
467 	return (error);
468 }
469 
470 /*
471  * nibble_1284_inbyte()
472  *
473  * Read 1 byte in NIBBLE mode
474  */
475 int
476 nibble_1284_inbyte(device_t bus, char *buffer)
477 {
478 	char nibble[2];
479 	int i, error;
480 
481 	for (i = 0; i < 2; i++) {
482 
483 		/* Event 7 - ready to take data (nAUTO low) */
484 		ppb_wctr(bus, (nINIT | AUTOFEED) & ~(STROBE | SELECTIN));
485 
486 		/* Event 8 - peripheral writes the first nibble */
487 
488 		/* Event 9 - peripheral set nAck low */
489 		if ((error = do_1284_wait(bus, nACK, 0))) {
490 			ppb_1284_set_error(bus, PPB_TIMEOUT, 9);
491 			goto error;
492 		}
493 
494 		/* read nibble */
495 		nibble[i] = ppb_rstr(bus);
496 
497 		/* Event 10 - ack, nibble received */
498 		ppb_wctr(bus, nINIT & ~(AUTOFEED | STROBE | SELECTIN));
499 
500 		/* Event 11 - wait ack from peripherial */
501 		if ((error = do_1284_wait(bus, nACK, nACK))) {
502 			ppb_1284_set_error(bus, PPB_TIMEOUT, 11);
503 			goto error;
504 		}
505 	}
506 
507 	*buffer = ((nibble2char(nibble[1]) << 4) & 0xf0) |
508 				(nibble2char(nibble[0]) & 0x0f);
509 
510 error:
511 	return (error);
512 }
513 
514 /*
515  * spp_1284_read()
516  *
517  * Read in IEEE1284 NIBBLE/BYTE mode
518  */
519 int
520 spp_1284_read(device_t bus, int mode, char *buffer, int max, int *read)
521 {
522 	int error = 0, len = 0;
523 	int terminate_after_transfer = 1;
524 	int state;
525 
526 	*read = len = 0;
527 
528 	state = ppb_1284_get_state(bus);
529 
530 	switch (state) {
531 	case PPB_FORWARD_IDLE:
532 		if ((error = ppb_1284_negociate(bus, mode, 0)))
533 			return (error);
534 		break;
535 
536 	case PPB_REVERSE_IDLE:
537 		terminate_after_transfer = 0;
538 		break;
539 
540 	default:
541 		ppb_1284_terminate(bus);
542 		if ((error = ppb_1284_negociate(bus, mode, 0)))
543 			return (error);
544 		break;
545 	}
546 
547 	while ((len < max) && !(ppb_rstr(bus) & (nFAULT))) {
548 
549 		ppb_1284_set_state(bus, PPB_REVERSE_TRANSFER);
550 
551 #ifdef DEBUG_1284
552 		printf("B");
553 #endif
554 
555 		switch (mode) {
556 		case PPB_NIBBLE:
557 			/* read a byte, error means no more data */
558 			if (nibble_1284_inbyte(bus, buffer+len))
559 				goto end_while;
560 			break;
561 		case PPB_BYTE:
562 			if (byte_1284_inbyte(bus, buffer+len))
563 				goto end_while;
564 			break;
565 		default:
566 			error = EINVAL;
567 			goto end_while;
568 		}
569 		len ++;
570 	}
571 end_while:
572 
573 	if (!error)
574 		ppb_1284_set_state(bus, PPB_REVERSE_IDLE);
575 
576 	*read = len;
577 
578 	if (terminate_after_transfer || error)
579 		ppb_1284_terminate(bus);
580 
581 	return (error);
582 }
583 
584 /*
585  * ppb_1284_read_id()
586  *
587  */
588 int
589 ppb_1284_read_id(device_t bus, int mode, char *buffer,
590 		int max, int *read)
591 {
592 	int error = 0;
593 
594 	/* fill the buffer with 0s */
595 	bzero(buffer, max);
596 
597 	switch (mode) {
598 	case PPB_NIBBLE:
599 	case PPB_ECP:
600 		if ((error = ppb_1284_negociate(bus, PPB_NIBBLE, PPB_REQUEST_ID)))
601 			return (error);
602 		error = spp_1284_read(bus, PPB_NIBBLE, buffer, max, read);
603 		break;
604 	case PPB_BYTE:
605 		if ((error = ppb_1284_negociate(bus, PPB_BYTE, PPB_REQUEST_ID)))
606 			return (error);
607 		error = spp_1284_read(bus, PPB_BYTE, buffer, max, read);
608 		break;
609 	default:
610 		panic("%s: unsupported mode %d\n", __FUNCTION__, mode);
611 	}
612 
613 	ppb_1284_terminate(bus);
614 	return (error);
615 }
616 
617 /*
618  * ppb_1284_read()
619  *
620  * IEEE1284 read
621  */
622 int
623 ppb_1284_read(device_t bus, int mode, char *buffer,
624 		int max, int *read)
625 {
626 	int error = 0;
627 
628 	switch (mode) {
629 	case PPB_NIBBLE:
630 	case PPB_BYTE:
631 		error = spp_1284_read(bus, mode, buffer, max, read);
632 		break;
633 	default:
634 		return (EINVAL);
635 	}
636 
637 	return (error);
638 }
639 
640 /*
641  * ppb_1284_negociate()
642  *
643  * IEEE1284 negociation phase
644  *
645  * Normal nibble mode or request device id mode (see ppb_1284.h)
646  *
647  * After negociation, nFAULT is low if data is available
648  */
649 int
650 ppb_1284_negociate(device_t bus, int mode, int options)
651 {
652 	int error;
653 	int request_mode;
654 
655 #ifdef DEBUG_1284
656 	printf("n");
657 #endif
658 
659 	if (ppb_1284_get_state(bus) >= PPB_PERIPHERAL_NEGOCIATION)
660 		ppb_peripheral_terminate(bus, PPB_WAIT);
661 
662 	if (ppb_1284_get_state(bus) != PPB_FORWARD_IDLE)
663 		ppb_1284_terminate(bus);
664 
665 #ifdef DEBUG_1284
666 	printf("%d", mode);
667 #endif
668 
669 	/* ensure the host is in compatible mode */
670 	ppb_set_mode(bus, PPB_COMPATIBLE);
671 
672 	/* reset error to catch the actual negociation error */
673 	ppb_1284_reset_error(bus, PPB_FORWARD_IDLE);
674 
675 	/* calculate ext. value */
676 	request_mode = ppb_request_mode(mode, options);
677 
678 	/* default state */
679 	ppb_wctr(bus, (nINIT | SELECTIN) & ~(STROBE | AUTOFEED));
680 	DELAY(1);
681 
682 	/* enter negociation phase */
683 	ppb_1284_set_state(bus, PPB_NEGOCIATION);
684 
685 	/* Event 0 - put the exten. value on the data lines */
686 	ppb_wdtr(bus, request_mode);
687 
688 #ifdef PERIPH_1284
689 	/* request remote host attention */
690         ppb_wctr(bus, (nINIT | STROBE) & ~(AUTOFEED | SELECTIN));
691         DELAY(1);
692         ppb_wctr(bus, (nINIT) & ~(STROBE | AUTOFEED | SELECTIN));
693 #else
694 	DELAY(1);
695 
696 #endif /* !PERIPH_1284 */
697 
698 	/* Event 1 - enter IEEE1284 mode */
699 	ppb_wctr(bus, (nINIT | AUTOFEED) & ~(STROBE | SELECTIN));
700 
701 #ifdef PERIPH_1284
702 	/* ignore the PError line, wait a bit more, remote host's
703 	 * interrupts don't respond fast enough */
704 	if (ppb_poll_bus(bus, 40, nACK | SELECT | nFAULT,
705 				SELECT | nFAULT, PPB_NOINTR | PPB_POLL)) {
706                 ppb_1284_set_error(bus, PPB_NOT_IEEE1284, 2);
707                 error = ENODEV;
708                 goto error;
709         }
710 #else
711 	/* Event 2 - trying IEEE1284 dialog */
712 	if (do_1284_wait(bus, nACK | PERROR | SELECT | nFAULT,
713 			PERROR  | SELECT | nFAULT)) {
714 		ppb_1284_set_error(bus, PPB_NOT_IEEE1284, 2);
715 		error = ENODEV;
716 		goto error;
717 	}
718 #endif /* !PERIPH_1284 */
719 
720 	/* Event 3 - latch the ext. value to the peripheral */
721 	ppb_wctr(bus, (nINIT | STROBE | AUTOFEED) & ~SELECTIN);
722 	DELAY(1);
723 
724 	/* Event 4 - IEEE1284 device recognized */
725 	ppb_wctr(bus, nINIT & ~(SELECTIN | AUTOFEED | STROBE));
726 
727 	/* Event 6 - waiting for status lines */
728 	if (do_1284_wait(bus, nACK, nACK)) {
729 		ppb_1284_set_error(bus, PPB_TIMEOUT, 6);
730 		error = EBUSY;
731 		goto error;
732 	}
733 
734 	/* Event 7 - quering result consider nACK not to misunderstand
735 	 * a remote computer terminate sequence */
736 	if (options & PPB_EXTENSIBILITY_LINK) {
737 
738 		/* XXX not fully supported yet */
739 		ppb_1284_terminate(bus);
740 		return (0);
741 
742 	}
743 	if (request_mode == NIBBLE_1284_NORMAL) {
744 		if (do_1284_wait(bus, nACK | SELECT, nACK)) {
745 			ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 7);
746 			error = ENODEV;
747 			goto error;
748 		}
749 	} else {
750 		if (do_1284_wait(bus, nACK | SELECT, SELECT | nACK)) {
751 			ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 7);
752 			error = ENODEV;
753 			goto error;
754 		}
755 	}
756 
757 	switch (mode) {
758 	case PPB_NIBBLE:
759 	case PPB_PS2:
760 		/* enter reverse idle phase */
761 		ppb_1284_set_state(bus, PPB_REVERSE_IDLE);
762 		break;
763 	case PPB_ECP:
764 		/* negociation ok, now setup the communication */
765 		ppb_1284_set_state(bus, PPB_SETUP);
766 		ppb_wctr(bus, (nINIT | AUTOFEED) & ~(SELECTIN | STROBE));
767 
768 #ifdef PERIPH_1284
769 		/* ignore PError line */
770 		if (do_1284_wait(bus, nACK | SELECT | nBUSY,
771                                         nACK | SELECT | nBUSY)) {
772                         ppb_1284_set_error(bus, PPB_TIMEOUT, 30);
773                         error = ENODEV;
774                         goto error;
775                 }
776 #else
777 		if (do_1284_wait(bus, nACK | SELECT | PERROR | nBUSY,
778 					nACK | SELECT | PERROR | nBUSY)) {
779 			ppb_1284_set_error(bus, PPB_TIMEOUT, 30);
780 			error = ENODEV;
781 			goto error;
782 		}
783 #endif /* !PERIPH_1284 */
784 
785 		/* ok, the host enters the ForwardIdle state */
786 		ppb_1284_set_state(bus, PPB_ECP_FORWARD_IDLE);
787 		break;
788 	case PPB_EPP:
789 		ppb_1284_set_state(bus, PPB_EPP_IDLE);
790 		break;
791 
792 	default:
793 		panic("%s: unknown mode (%d)!", __FUNCTION__, mode);
794 	}
795 	ppb_set_mode(bus, mode);
796 
797 	return (0);
798 
799 error:
800 	ppb_1284_terminate(bus);
801 
802 	return (error);
803 }
804 
805 /*
806  * ppb_1284_terminate()
807  *
808  * IEEE1284 termination phase, return code should ignored since the host
809  * is _always_ in compatible mode after ppb_1284_terminate()
810  */
811 int
812 ppb_1284_terminate(device_t bus)
813 {
814 
815 #ifdef DEBUG_1284
816 	printf("T");
817 #endif
818 
819 	/* do not reset error here to keep the error that
820 	 * may occured before the ppb_1284_terminate() call */
821 	ppb_1284_set_state(bus, PPB_TERMINATION);
822 
823 #ifdef PERIPH_1284
824 	/* request remote host attention */
825         ppb_wctr(bus, (nINIT | STROBE | SELECTIN) & ~(AUTOFEED));
826         DELAY(1);
827 #endif /* PERIPH_1284 */
828 
829 	/* Event 22 - set nSelectin low and nAutoFeed high */
830 	ppb_wctr(bus, (nINIT | SELECTIN) & ~(STROBE | AUTOFEED));
831 
832 	/* Event 24 - waiting for peripheral, Xflag ignored */
833 	if (do_1284_wait(bus, nACK | nBUSY | nFAULT, nFAULT)) {
834 		ppb_1284_set_error(bus, PPB_TIMEOUT, 24);
835 		goto error;
836 	}
837 
838 	/* Event 25 - set nAutoFd low */
839 	ppb_wctr(bus, (nINIT | SELECTIN | AUTOFEED) & ~STROBE);
840 
841 	/* Event 26 - compatible mode status is set */
842 
843 	/* Event 27 - peripheral set nAck high */
844 	if (do_1284_wait(bus, nACK, nACK)) {
845 		ppb_1284_set_error(bus, PPB_TIMEOUT, 27);
846 	}
847 
848 	/* Event 28 - end termination, return to idle phase */
849 	ppb_wctr(bus, (nINIT | SELECTIN) & ~(STROBE | AUTOFEED));
850 
851 error:
852 	/* return to compatible mode */
853 	ppb_set_mode(bus, PPB_COMPATIBLE);
854 	ppb_1284_set_state(bus, PPB_FORWARD_IDLE);
855 
856 	return (0);
857 }
858