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 #include <dev/ppbus/ppbconf.h>
47 #include <dev/ppbus/ppb_1284.h>
48
49 #include "ppbus_if.h"
50
51 #include <dev/ppbus/ppbio.h>
52
53 #define DEVTOSOFTC(dev) ((struct ppb_data *)device_get_softc(dev))
54
55 /*
56 * do_1284_wait()
57 *
58 * Wait for the peripherial up to 40ms
59 */
60 static int
61 do_1284_wait(device_t bus, uint8_t mask, uint8_t status)
62 {
63 return (ppb_poll_bus(bus, 4, mask, status, PPB_NOINTR | PPB_POLL));
64 }
65
66 static int
67 do_peripheral_wait(device_t bus, uint8_t mask, uint8_t status)
68 {
69 return (ppb_poll_bus(bus, 100, mask, status, PPB_NOINTR | PPB_POLL));
70 }
71
72 #define nibble2char(s) (((s & ~nACK) >> 3) | (~s & nBUSY) >> 4)
73
74 /*
75 * ppb_1284_reset_error()
76 *
77 * Unconditionaly reset the error field
78 */
79 static int
80 ppb_1284_reset_error(device_t bus, int state)
81 {
82 struct ppb_data *ppb = DEVTOSOFTC(bus);
83
84 ppb->error = PPB_NO_ERROR;
85 ppb->state = state;
86
87 return (0);
88 }
89
90 /*
91 * ppb_1284_get_state()
92 *
93 * Get IEEE1284 state
94 */
95 int
96 ppb_1284_get_state(device_t bus)
97 {
98 struct ppb_data *ppb = DEVTOSOFTC(bus);
99
100 mtx_assert(ppb->ppc_lock, MA_OWNED);
101 return (ppb->state);
102 }
103
104 /*
105 * ppb_1284_set_state()
106 *
107 * Change IEEE1284 state if no error occurred
108 */
109 int
110 ppb_1284_set_state(device_t bus, int state)
111 {
112 struct ppb_data *ppb = DEVTOSOFTC(bus);
113
114 /* call ppb_1284_reset_error() if you absolutely want to change
115 * the state from PPB_ERROR to another */
116 mtx_assert(ppb->ppc_lock, MA_OWNED);
117 if ((ppb->state != PPB_ERROR) &&
118 (ppb->error == PPB_NO_ERROR)) {
119 ppb->state = state;
120 ppb->error = PPB_NO_ERROR;
121 }
122
123 return (0);
124 }
125
126 static int
127 ppb_1284_set_error(device_t bus, int error, int event)
128 {
129 struct ppb_data *ppb = DEVTOSOFTC(bus);
130
131 /* do not accumulate errors */
132 if ((ppb->error == PPB_NO_ERROR) &&
133 (ppb->state != PPB_ERROR)) {
134 ppb->error = error;
135 ppb->state = PPB_ERROR;
136 }
137
138 #ifdef DEBUG_1284
139 printf("ppb1284: error=%d status=0x%x event=%d\n", error,
140 ppb_rstr(bus) & 0xff, event);
141 #endif
142
143 return (0);
144 }
145
146 /*
147 * ppb_request_mode()
148 *
149 * Converts mode+options into ext. value
150 */
151 static int
152 ppb_request_mode(int mode, int options)
153 {
154 int request_mode = 0;
155
156 if (options & PPB_EXTENSIBILITY_LINK) {
157 request_mode = EXT_LINK_1284_NORMAL;
158
159 } else {
160 switch (mode) {
161 case PPB_NIBBLE:
162 request_mode = (options & PPB_REQUEST_ID) ?
163 NIBBLE_1284_REQUEST_ID :
164 NIBBLE_1284_NORMAL;
165 break;
166 case PPB_PS2:
167 request_mode = (options & PPB_REQUEST_ID) ?
168 BYTE_1284_REQUEST_ID :
169 BYTE_1284_NORMAL;
170 break;
171 case PPB_ECP:
172 if (options & PPB_USE_RLE)
173 request_mode = (options & PPB_REQUEST_ID) ?
174 ECP_1284_RLE_REQUEST_ID :
175 ECP_1284_RLE;
176 else
177 request_mode = (options & PPB_REQUEST_ID) ?
178 ECP_1284_REQUEST_ID :
179 ECP_1284_NORMAL;
180 break;
181 case PPB_EPP:
182 request_mode = EPP_1284_NORMAL;
183 break;
184 default:
185 panic("%s: unsupported mode %d\n", __func__, mode);
186 }
187 }
188
189 return (request_mode);
190 }
191
192 /*
193 * ppb_peripheral_negociate()
194 *
195 * Negotiate the peripheral side
196 */
197 int
198 ppb_peripheral_negociate(device_t bus, int mode, int options)
199 {
200 int spin, request_mode, error = 0;
201 char r;
202
203 ppb_set_mode(bus, PPB_COMPATIBLE);
204 ppb_1284_set_state(bus, PPB_PERIPHERAL_NEGOCIATION);
205
206 /* compute ext. value */
207 request_mode = ppb_request_mode(mode, options);
208
209 /* wait host */
210 spin = 10;
211 while (spin-- && (ppb_rstr(bus) & nBUSY))
212 DELAY(1);
213
214 /* check termination */
215 if (!(ppb_rstr(bus) & SELECT) || !spin) {
216 error = ENODEV;
217 goto error;
218 }
219
220 /* Event 4 - read ext. value */
221 r = ppb_rdtr(bus);
222
223 /* nibble mode is not supported */
224 if ((r == (char)request_mode) ||
225 (r == NIBBLE_1284_NORMAL)) {
226 /* Event 5 - restore direction bit, no data avail */
227 ppb_wctr(bus, (STROBE | nINIT) & ~(SELECTIN));
228 DELAY(1);
229
230 /* Event 6 */
231 ppb_wctr(bus, (nINIT) & ~(SELECTIN | STROBE));
232
233 if (r == NIBBLE_1284_NORMAL) {
234 #ifdef DEBUG_1284
235 printf("R");
236 #endif
237 ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 4);
238 error = EINVAL;
239 goto error;
240 } else {
241 ppb_1284_set_state(bus, PPB_PERIPHERAL_IDLE);
242 switch (r) {
243 case BYTE_1284_NORMAL:
244 ppb_set_mode(bus, PPB_BYTE);
245 break;
246 default:
247 break;
248 }
249 #ifdef DEBUG_1284
250 printf("A");
251 #endif
252 /* negotiation succeeds */
253 }
254 } else {
255 /* Event 5 - mode not supported */
256 ppb_wctr(bus, SELECTIN);
257 DELAY(1);
258
259 /* Event 6 */
260 ppb_wctr(bus, (SELECTIN) & ~(STROBE | nINIT));
261 ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 4);
262
263 #ifdef DEBUG_1284
264 printf("r");
265 #endif
266 error = EINVAL;
267 goto error;
268 }
269
270 return (0);
271
272 error:
273 ppb_peripheral_terminate(bus, PPB_WAIT);
274 return (error);
275 }
276
277 /*
278 * ppb_peripheral_terminate()
279 *
280 * Terminate peripheral transfer side
281 *
282 * Always return 0 in compatible mode
283 */
284 int
285 ppb_peripheral_terminate(device_t bus, int how)
286 {
287 int error = 0;
288
289 #ifdef DEBUG_1284
290 printf("t");
291 #endif
292
293 ppb_1284_set_state(bus, PPB_PERIPHERAL_TERMINATION);
294
295 /* Event 22 - wait up to host response time (1s) */
296 if ((error = do_peripheral_wait(bus, SELECT | nBUSY, 0))) {
297 ppb_1284_set_error(bus, PPB_TIMEOUT, 22);
298 goto error;
299 }
300
301 /* Event 24 */
302 ppb_wctr(bus, (nINIT | STROBE) & ~(AUTOFEED | SELECTIN));
303
304 /* Event 25 - wait up to host response time (1s) */
305 if ((error = do_peripheral_wait(bus, nBUSY, nBUSY))) {
306 ppb_1284_set_error(bus, PPB_TIMEOUT, 25);
307 goto error;
308 }
309
310 /* Event 26 */
311 ppb_wctr(bus, (SELECTIN | nINIT | STROBE) & ~(AUTOFEED));
312 DELAY(1);
313 /* Event 27 */
314 ppb_wctr(bus, (SELECTIN | nINIT) & ~(STROBE | AUTOFEED));
315
316 /* Event 28 - wait up to host response time (1s) */
317 if ((error = do_peripheral_wait(bus, nBUSY, 0))) {
318 ppb_1284_set_error(bus, PPB_TIMEOUT, 28);
319 goto error;
320 }
321
322 error:
323 ppb_set_mode(bus, PPB_COMPATIBLE);
324 ppb_1284_set_state(bus, PPB_FORWARD_IDLE);
325
326 return (0);
327 }
328
329 /*
330 * byte_peripheral_outbyte()
331 *
332 * Write 1 byte in BYTE mode
333 */
334 static int
335 byte_peripheral_outbyte(device_t bus, char *buffer, int last)
336 {
337 int error = 0;
338
339 /* Event 7 */
340 if ((error = do_1284_wait(bus, nBUSY, nBUSY))) {
341 ppb_1284_set_error(bus, PPB_TIMEOUT, 7);
342 goto error;
343 }
344
345 /* check termination */
346 if (!(ppb_rstr(bus) & SELECT)) {
347 ppb_peripheral_terminate(bus, PPB_WAIT);
348 goto error;
349 }
350
351 /* Event 15 - put byte on data lines */
352 #ifdef DEBUG_1284
353 printf("B");
354 #endif
355 ppb_wdtr(bus, *buffer);
356
357 /* Event 9 */
358 ppb_wctr(bus, (AUTOFEED | STROBE) & ~(nINIT | SELECTIN));
359
360 /* Event 10 - wait data read */
361 if ((error = do_peripheral_wait(bus, nBUSY, 0))) {
362 ppb_1284_set_error(bus, PPB_TIMEOUT, 16);
363 goto error;
364 }
365
366 /* Event 11 */
367 if (!last) {
368 ppb_wctr(bus, (AUTOFEED) & ~(nINIT | STROBE | SELECTIN));
369 } else {
370 ppb_wctr(bus, (nINIT) & ~(STROBE | SELECTIN | AUTOFEED));
371 }
372
373 #if 0
374 /* Event 16 - wait strobe */
375 if ((error = do_peripheral_wait(bus, nACK | nBUSY, 0))) {
376 ppb_1284_set_error(bus, PPB_TIMEOUT, 16);
377 goto error;
378 }
379 #endif
380
381 /* check termination */
382 if (!(ppb_rstr(bus) & SELECT)) {
383 ppb_peripheral_terminate(bus, PPB_WAIT);
384 goto error;
385 }
386
387 error:
388 return (error);
389 }
390
391 /*
392 * byte_peripheral_write()
393 *
394 * Write n bytes in BYTE mode
395 */
396 int
397 byte_peripheral_write(device_t bus, char *buffer, int len, int *sent)
398 {
399 int error = 0, i;
400 char r;
401
402 ppb_1284_set_state(bus, PPB_PERIPHERAL_TRANSFER);
403
404 /* wait forever, the remote host is master and should initiate
405 * termination
406 */
407 for (i=0; i<len; i++) {
408 /* force remote nFAULT low to release the remote waiting
409 * process, if any
410 */
411 r = ppb_rctr(bus);
412 ppb_wctr(bus, r & ~nINIT);
413
414 #ifdef DEBUG_1284
415 printf("y");
416 #endif
417 /* Event 7 */
418 error = ppb_poll_bus(bus, PPB_FOREVER, nBUSY, nBUSY,
419 PPB_INTR);
420
421 if (error && error != EWOULDBLOCK)
422 goto error;
423
424 #ifdef DEBUG_1284
425 printf("b");
426 #endif
427 if ((error = byte_peripheral_outbyte(bus, buffer+i, (i == len-1))))
428 goto error;
429 }
430 error:
431 if (!error)
432 ppb_1284_set_state(bus, PPB_PERIPHERAL_IDLE);
433
434 *sent = i;
435 return (error);
436 }
437
438 /*
439 * byte_1284_inbyte()
440 *
441 * Read 1 byte in BYTE mode
442 */
443 int
444 byte_1284_inbyte(device_t bus, char *buffer)
445 {
446 int error = 0;
447
448 /* Event 7 - ready to take data (nAUTO low) */
449 ppb_wctr(bus, (PCD | nINIT | AUTOFEED) & ~(STROBE | SELECTIN));
450
451 /* Event 9 - peripheral set nAck low */
452 if ((error = do_1284_wait(bus, nACK, 0))) {
453 ppb_1284_set_error(bus, PPB_TIMEOUT, 9);
454 goto error;
455 }
456
457 /* read the byte */
458 *buffer = ppb_rdtr(bus);
459
460 /* Event 10 - data received, can't accept more */
461 ppb_wctr(bus, (nINIT) & ~(AUTOFEED | STROBE | SELECTIN));
462
463 /* Event 11 - peripheral ack */
464 if ((error = do_1284_wait(bus, nACK, nACK))) {
465 ppb_1284_set_error(bus, PPB_TIMEOUT, 11);
466 goto error;
467 }
468
469 /* Event 16 - strobe */
470 ppb_wctr(bus, (nINIT | STROBE) & ~(AUTOFEED | SELECTIN));
471 DELAY(3);
472 ppb_wctr(bus, (nINIT) & ~(AUTOFEED | STROBE | SELECTIN));
473
474 error:
475 return (error);
476 }
477
478 /*
479 * nibble_1284_inbyte()
480 *
481 * Read 1 byte in NIBBLE mode
482 */
483 int
484 nibble_1284_inbyte(device_t bus, char *buffer)
485 {
486 char nibble[2];
487 int i, error;
488
489 for (i = 0; i < 2; i++) {
490 /* Event 7 - ready to take data (nAUTO low) */
491 ppb_wctr(bus, (nINIT | AUTOFEED) & ~(STROBE | SELECTIN));
492
493 /* Event 8 - peripheral writes the first nibble */
494
495 /* Event 9 - peripheral set nAck low */
496 if ((error = do_1284_wait(bus, nACK, 0))) {
497 ppb_1284_set_error(bus, PPB_TIMEOUT, 9);
498 goto error;
499 }
500
501 /* read nibble */
502 nibble[i] = ppb_rstr(bus);
503
504 /* Event 10 - ack, nibble received */
505 ppb_wctr(bus, nINIT & ~(AUTOFEED | STROBE | SELECTIN));
506
507 /* Event 11 - wait ack from peripherial */
508 if ((error = do_1284_wait(bus, nACK, nACK))) {
509 ppb_1284_set_error(bus, PPB_TIMEOUT, 11);
510 goto error;
511 }
512 }
513
514 *buffer = ((nibble2char(nibble[1]) << 4) & 0xf0) |
515 (nibble2char(nibble[0]) & 0x0f);
516
517 error:
518 return (error);
519 }
520
521 /*
522 * spp_1284_read()
523 *
524 * Read in IEEE1284 NIBBLE/BYTE mode
525 */
526 int
527 spp_1284_read(device_t bus, int mode, char *buffer, int max, int *read)
528 {
529 int error = 0, len = 0;
530 int terminate_after_transfer = 1;
531 int state;
532
533 *read = len = 0;
534
535 state = ppb_1284_get_state(bus);
536
537 switch (state) {
538 case PPB_FORWARD_IDLE:
539 if ((error = ppb_1284_negociate(bus, mode, 0)))
540 return (error);
541 break;
542
543 case PPB_REVERSE_IDLE:
544 terminate_after_transfer = 0;
545 break;
546
547 default:
548 ppb_1284_terminate(bus);
549 if ((error = ppb_1284_negociate(bus, mode, 0)))
550 return (error);
551 break;
552 }
553
554 while ((len < max) && !(ppb_rstr(bus) & (nFAULT))) {
555 ppb_1284_set_state(bus, PPB_REVERSE_TRANSFER);
556
557 #ifdef DEBUG_1284
558 printf("B");
559 #endif
560
561 switch (mode) {
562 case PPB_NIBBLE:
563 /* read a byte, error means no more data */
564 if (nibble_1284_inbyte(bus, buffer+len))
565 goto end_while;
566 break;
567 case PPB_BYTE:
568 if (byte_1284_inbyte(bus, buffer+len))
569 goto end_while;
570 break;
571 default:
572 error = EINVAL;
573 goto end_while;
574 }
575 len ++;
576 }
577 end_while:
578
579 if (!error)
580 ppb_1284_set_state(bus, PPB_REVERSE_IDLE);
581
582 *read = len;
583
584 if (terminate_after_transfer || error)
585 ppb_1284_terminate(bus);
586
587 return (error);
588 }
589
590 /*
591 * ppb_1284_read_id()
592 *
593 */
594 int
595 ppb_1284_read_id(device_t bus, int mode, char *buffer,
596 int max, int *read)
597 {
598 int error = 0;
599
600 /* fill the buffer with 0s */
601 bzero(buffer, max);
602
603 switch (mode) {
604 case PPB_NIBBLE:
605 case PPB_ECP:
606 if ((error = ppb_1284_negociate(bus, PPB_NIBBLE, PPB_REQUEST_ID)))
607 return (error);
608 error = spp_1284_read(bus, PPB_NIBBLE, buffer, max, read);
609 break;
610 case PPB_BYTE:
611 if ((error = ppb_1284_negociate(bus, PPB_BYTE, PPB_REQUEST_ID)))
612 return (error);
613 error = spp_1284_read(bus, PPB_BYTE, buffer, max, read);
614 break;
615 default:
616 panic("%s: unsupported mode %d\n", __func__, mode);
617 }
618
619 ppb_1284_terminate(bus);
620 return (error);
621 }
622
623 /*
624 * ppb_1284_read()
625 *
626 * IEEE1284 read
627 */
628 int
629 ppb_1284_read(device_t bus, int mode, char *buffer,
630 int max, int *read)
631 {
632 int error = 0;
633
634 switch (mode) {
635 case PPB_NIBBLE:
636 case PPB_BYTE:
637 error = spp_1284_read(bus, mode, buffer, max, read);
638 break;
639 default:
640 return (EINVAL);
641 }
642
643 return (error);
644 }
645
646 /*
647 * ppb_1284_negociate()
648 *
649 * IEEE1284 negotiation phase
650 *
651 * Normal nibble mode or request device id mode (see ppb_1284.h)
652 *
653 * After negotiation, nFAULT is low if data is available
654 */
655 int
656 ppb_1284_negociate(device_t bus, int mode, int options)
657 {
658 int error;
659 int request_mode;
660
661 #ifdef DEBUG_1284
662 printf("n");
663 #endif
664
665 if (ppb_1284_get_state(bus) >= PPB_PERIPHERAL_NEGOCIATION)
666 ppb_peripheral_terminate(bus, PPB_WAIT);
667
668 if (ppb_1284_get_state(bus) != PPB_FORWARD_IDLE)
669 ppb_1284_terminate(bus);
670
671 #ifdef DEBUG_1284
672 printf("%d", mode);
673 #endif
674
675 /* ensure the host is in compatible mode */
676 ppb_set_mode(bus, PPB_COMPATIBLE);
677
678 /* reset error to catch the actual negotiation error */
679 ppb_1284_reset_error(bus, PPB_FORWARD_IDLE);
680
681 /* calculate ext. value */
682 request_mode = ppb_request_mode(mode, options);
683
684 /* default state */
685 ppb_wctr(bus, (nINIT | SELECTIN) & ~(STROBE | AUTOFEED));
686 DELAY(1);
687
688 /* enter negotiation phase */
689 ppb_1284_set_state(bus, PPB_NEGOCIATION);
690
691 /* Event 0 - put the exten. value on the data lines */
692 ppb_wdtr(bus, request_mode);
693
694 #ifdef PERIPH_1284
695 /* request remote host attention */
696 ppb_wctr(bus, (nINIT | STROBE) & ~(AUTOFEED | SELECTIN));
697 DELAY(1);
698 ppb_wctr(bus, (nINIT) & ~(STROBE | AUTOFEED | SELECTIN));
699 #else
700 DELAY(1);
701
702 #endif /* !PERIPH_1284 */
703
704 /* Event 1 - enter IEEE1284 mode */
705 ppb_wctr(bus, (nINIT | AUTOFEED) & ~(STROBE | SELECTIN));
706
707 #ifdef PERIPH_1284
708 /* ignore the PError line, wait a bit more, remote host's
709 * interrupts don't respond fast enough */
710 if (ppb_poll_bus(bus, 40, nACK | SELECT | nFAULT,
711 SELECT | nFAULT, PPB_NOINTR | PPB_POLL)) {
712 ppb_1284_set_error(bus, PPB_NOT_IEEE1284, 2);
713 error = ENODEV;
714 goto error;
715 }
716 #else
717 /* Event 2 - trying IEEE1284 dialog */
718 if (do_1284_wait(bus, nACK | PERROR | SELECT | nFAULT,
719 PERROR | SELECT | nFAULT)) {
720 ppb_1284_set_error(bus, PPB_NOT_IEEE1284, 2);
721 error = ENODEV;
722 goto error;
723 }
724 #endif /* !PERIPH_1284 */
725
726 /* Event 3 - latch the ext. value to the peripheral */
727 ppb_wctr(bus, (nINIT | STROBE | AUTOFEED) & ~SELECTIN);
728 DELAY(1);
729
730 /* Event 4 - IEEE1284 device recognized */
731 ppb_wctr(bus, nINIT & ~(SELECTIN | AUTOFEED | STROBE));
732
733 /* Event 6 - waiting for status lines */
734 if (do_1284_wait(bus, nACK, nACK)) {
735 ppb_1284_set_error(bus, PPB_TIMEOUT, 6);
736 error = EBUSY;
737 goto error;
738 }
739
740 /* Event 7 - querying result consider nACK not to misunderstand
741 * a remote computer terminate sequence */
742 if (options & PPB_EXTENSIBILITY_LINK) {
743 /* XXX not fully supported yet */
744 ppb_1284_terminate(bus);
745 return (0);
746 }
747 if (request_mode == NIBBLE_1284_NORMAL) {
748 if (do_1284_wait(bus, nACK | SELECT, nACK)) {
749 ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 7);
750 error = ENODEV;
751 goto error;
752 }
753 } else {
754 if (do_1284_wait(bus, nACK | SELECT, SELECT | nACK)) {
755 ppb_1284_set_error(bus, PPB_MODE_UNSUPPORTED, 7);
756 error = ENODEV;
757 goto error;
758 }
759 }
760
761 switch (mode) {
762 case PPB_NIBBLE:
763 case PPB_PS2:
764 /* enter reverse idle phase */
765 ppb_1284_set_state(bus, PPB_REVERSE_IDLE);
766 break;
767 case PPB_ECP:
768 /* negotiation ok, now setup the communication */
769 ppb_1284_set_state(bus, PPB_SETUP);
770 ppb_wctr(bus, (nINIT | AUTOFEED) & ~(SELECTIN | STROBE));
771
772 #ifdef PERIPH_1284
773 /* ignore PError line */
774 if (do_1284_wait(bus, nACK | SELECT | nBUSY,
775 nACK | SELECT | nBUSY)) {
776 ppb_1284_set_error(bus, PPB_TIMEOUT, 30);
777 error = ENODEV;
778 goto error;
779 }
780 #else
781 if (do_1284_wait(bus, nACK | SELECT | PERROR | nBUSY,
782 nACK | SELECT | PERROR | nBUSY)) {
783 ppb_1284_set_error(bus, PPB_TIMEOUT, 30);
784 error = ENODEV;
785 goto error;
786 }
787 #endif /* !PERIPH_1284 */
788
789 /* ok, the host enters the ForwardIdle state */
790 ppb_1284_set_state(bus, PPB_ECP_FORWARD_IDLE);
791 break;
792 case PPB_EPP:
793 ppb_1284_set_state(bus, PPB_EPP_IDLE);
794 break;
795
796 default:
797 panic("%s: unknown mode (%d)!", __func__, mode);
798 }
799 ppb_set_mode(bus, mode);
800
801 return (0);
802
803 error:
804 ppb_1284_terminate(bus);
805
806 return (error);
807 }
808
809 /*
810 * ppb_1284_terminate()
811 *
812 * IEEE1284 termination phase, return code should ignored since the host
813 * is _always_ in compatible mode after ppb_1284_terminate()
814 */
815 int
816 ppb_1284_terminate(device_t bus)
817 {
818
819 #ifdef DEBUG_1284
820 printf("T");
821 #endif
822
823 /* do not reset error here to keep the error that
824 * may occurred before the ppb_1284_terminate() call */
825 ppb_1284_set_state(bus, PPB_TERMINATION);
826
827 #ifdef PERIPH_1284
828 /* request remote host attention */
829 ppb_wctr(bus, (nINIT | STROBE | SELECTIN) & ~(AUTOFEED));
830 DELAY(1);
831 #endif /* PERIPH_1284 */
832
833 /* Event 22 - set nSelectin low and nAutoFeed high */
834 ppb_wctr(bus, (nINIT | SELECTIN) & ~(STROBE | AUTOFEED));
835
836 /* Event 24 - waiting for peripheral, Xflag ignored */
837 if (do_1284_wait(bus, nACK | nBUSY | nFAULT, nFAULT)) {
838 ppb_1284_set_error(bus, PPB_TIMEOUT, 24);
839 goto error;
840 }
841
842 /* Event 25 - set nAutoFd low */
843 ppb_wctr(bus, (nINIT | SELECTIN | AUTOFEED) & ~STROBE);
844
845 /* Event 26 - compatible mode status is set */
846
847 /* Event 27 - peripheral set nAck high */
848 if (do_1284_wait(bus, nACK, nACK)) {
849 ppb_1284_set_error(bus, PPB_TIMEOUT, 27);
850 }
851
852 /* Event 28 - end termination, return to idle phase */
853 ppb_wctr(bus, (nINIT | SELECTIN) & ~(STROBE | AUTOFEED));
854
855 error:
856 /* return to compatible mode */
857 ppb_set_mode(bus, PPB_COMPATIBLE);
858 ppb_1284_set_state(bus, PPB_FORWARD_IDLE);
859
860 return (0);
861 }
Cache object: e3b2d084edd617efee5c67ea170f81ae
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