1 /* $Id: at91dbgu.c,v 1.19 2022/10/26 23:38:06 riastradh Exp $ */
2 /* $NetBSD: at91dbgu.c,v 1.19 2022/10/26 23:38:06 riastradh Exp $ */
3
4 /*
5 *
6 * Copyright (c) 1998, 1999, 2001, 2002, 2004 The NetBSD Foundation, Inc.
7 * All rights reserved.
8 *
9 * This code is derived from software contributed to The NetBSD Foundation
10 * by Jesse Off
11 *
12 * This code is derived from software contributed to The NetBSD Foundation
13 * by Ichiro FUKUHARA and Naoto Shimazaki.
14 *
15 * This code is derived from software contributed to The NetBSD Foundation
16 * by IWAMOTO Toshihiro.
17 *
18 * This code is derived from software contributed to The NetBSD Foundation
19 * by Charles M. Hannum.
20 *
21 * Redistribution and use in source and binary forms, with or without
22 * modification, are permitted provided that the following conditions
23 * are met:
24 * 1. Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
26 * 2. Redistributions in binary form must reproduce the above copyright
27 * notice, this list of conditions and the following disclaimer in the
28 * documentation and/or other materials provided with the distribution.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
31 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
32 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
33 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
34 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
35 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
36 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
37 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
38 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
39 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
40 * POSSIBILITY OF SUCH DAMAGE.
41 */
42
43 /*
44 * Copyright (c) 1991 The Regents of the University of California.
45 * All rights reserved.
46 *
47 * Redistribution and use in source and binary forms, with or without
48 * modification, are permitted provided that the following conditions
49 * are met:
50 * 1. Redistributions of source code must retain the above copyright
51 * notice, this list of conditions and the following disclaimer.
52 * 2. Redistributions in binary form must reproduce the above copyright
53 * notice, this list of conditions and the following disclaimer in the
54 * documentation and/or other materials provided with the distribution.
55 * 3. Neither the name of the University nor the names of its contributors
56 * may be used to endorse or promote products derived from this software
57 * without specific prior written permission.
58 *
59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
69 * SUCH DAMAGE.
70 *
71 * @(#)com.c 7.5 (Berkeley) 5/16/91
72 */
73
74 /*
75 * TODO: hardware flow control
76 */
77
78 #include <sys/cdefs.h>
79 __KERNEL_RCSID(0, "$NetBSD: at91dbgu.c,v 1.19 2022/10/26 23:38:06 riastradh Exp $");
80
81 #include "opt_kgdb.h"
82
83 #include "rnd.h"
84 #ifdef RND_COM
85 #include <sys/rndsource.h>
86 #endif
87
88 /*
89 * Override cnmagic(9) macro before including <sys/systm.h>.
90 * We need to know if cn_check_magic triggered debugger, so set a flag.
91 * Callers of cn_check_magic must declare int cn_trapped = 0;
92 * XXX: this is *ugly*!
93 */
94 #define cn_trap() \
95 do { \
96 console_debugger(); \
97 cn_trapped = 1; \
98 } while (/* CONSTCOND */ 0)
99
100 #include <sys/param.h>
101 #include <sys/systm.h>
102 #include <sys/types.h>
103 #include <sys/conf.h>
104 #include <sys/file.h>
105 #include <sys/device.h>
106 #include <sys/kernel.h>
107 #include <sys/kmem.h>
108 #include <sys/tty.h>
109 #include <sys/uio.h>
110 #include <sys/vnode.h>
111 #include <sys/kauth.h>
112
113 #include <machine/intr.h>
114 #include <sys/bus.h>
115
116 #include <ddb/db_active.h>
117
118 #include <arm/at91/at91reg.h>
119 #include <arm/at91/at91var.h>
120 #include <arm/at91/at91dbguvar.h>
121 #include <arm/at91/at91dbgureg.h>
122
123 #include <dev/cons.h>
124
125 static int at91dbgu_match(device_t, cfdata_t, void *);
126 static void at91dbgu_attach(device_t, device_t, void *);
127
128 static int at91dbgu_param(struct tty *, struct termios *);
129 static void at91dbgu_start(struct tty *);
130 static int at91dbgu_hwiflow(struct tty *, int);
131
132 #if 0
133 static u_int cflag2lcrhi(tcflag_t);
134 #endif
135 static void at91dbgu_iflush(struct at91dbgu_softc *);
136 static void at91dbgu_set(struct at91dbgu_softc *);
137
138 int at91dbgu_cn_getc(dev_t);
139 void at91dbgu_cn_putc(dev_t, int);
140 void at91dbgu_cn_pollc(dev_t, int);
141
142 static void at91dbgu_soft(void* arg);
143 inline static void at91dbgu_txsoft(struct at91dbgu_softc *, struct tty *);
144 inline static void at91dbgu_rxsoft(struct at91dbgu_softc *, struct tty *);
145
146 void at91dbgu_cn_probe(struct consdev *);
147 void at91dbgu_cn_init(struct consdev *);
148
149 static struct at91dbgu_cons_softc {
150 bus_space_tag_t sc_iot;
151 bus_space_handle_t sc_ioh;
152 bus_addr_t sc_hwbase;
153 int sc_ospeed;
154 tcflag_t sc_cflag;
155 int sc_attached;
156
157 uint8_t *sc_rx_ptr;
158 uint8_t sc_rx_fifo[64];
159 } dbgu_cn_sc;
160
161 static struct cnm_state at91dbgu_cnm_state;
162
163 CFATTACH_DECL_NEW(at91dbgu, sizeof(struct at91dbgu_softc),
164 at91dbgu_match, at91dbgu_attach, NULL, NULL);
165
166 extern struct cfdriver at91dbgu_cd;
167
168 dev_type_open(at91dbgu_open);
169 dev_type_close(at91dbgu_close);
170 dev_type_read(at91dbgu_read);
171 dev_type_write(at91dbgu_write);
172 dev_type_ioctl(at91dbgu_ioctl);
173 dev_type_stop(at91dbgu_stop);
174 dev_type_tty(at91dbgu_tty);
175 dev_type_poll(at91dbgu_poll);
176
177 const struct cdevsw at91dbgu_cdevsw = {
178 .d_open = at91dbgu_open,
179 .d_close = at91dbgu_close,
180 .d_read = at91dbgu_read,
181 .d_write = at91dbgu_write,
182 .d_ioctl = at91dbgu_ioctl,
183 .d_stop = at91dbgu_stop,
184 .d_tty = at91dbgu_tty,
185 .d_poll = at91dbgu_poll,
186 .d_mmap = nommap,
187 .d_kqfilter = ttykqfilter,
188 .d_discard = nodiscard,
189 .d_flag = D_TTY
190 };
191
192 struct consdev at91dbgu_cons = {
193 at91dbgu_cn_probe, NULL, at91dbgu_cn_getc, at91dbgu_cn_putc, at91dbgu_cn_pollc, NULL,
194 NULL, NULL, NODEV, CN_REMOTE
195 };
196
197 #ifndef DEFAULT_COMSPEED
198 #define DEFAULT_COMSPEED 115200
199 #endif
200
201 #define COMUNIT(x) TTUNIT(x)
202 #define COMDIALOUT(x) TTDIALOUT(x)
203
204 #define COM_ISALIVE(sc) ((sc)->enabled != 0 && device_is_active((sc)->sc_dev))
205
206 static int
at91dbgu_match(device_t parent,cfdata_t match,void * aux)207 at91dbgu_match(device_t parent, cfdata_t match, void *aux)
208 {
209 if (strcmp(match->cf_name, "at91dbgu") == 0)
210 return 2;
211 return 0;
212 }
213
214 static int
215 dbgu_intr(void* arg);
216
217 static void
at91dbgu_attach(device_t parent,device_t self,void * aux)218 at91dbgu_attach(device_t parent, device_t self, void *aux)
219 {
220 struct at91dbgu_softc *sc = device_private(self);
221 struct at91bus_attach_args *sa = aux;
222 struct tty *tp;
223
224 printf("\n");
225
226 sc->sc_dev = self;
227 bus_space_map(sa->sa_iot, sa->sa_addr, sa->sa_size, 0, &sc->sc_ioh);
228 sc->sc_iot = sa->sa_iot;
229 sc->sc_hwbase = sa->sa_addr;
230
231 DBGUREG(DBGU_IDR) = -1;
232 at91_intr_establish(sa->sa_pid, IPL_SERIAL, INTR_HIGH_LEVEL, dbgu_intr, sc);
233 DBGU_INIT(AT91_MSTCLK, 115200U);
234
235 if (sc->sc_iot == dbgu_cn_sc.sc_iot
236 && sc->sc_hwbase == dbgu_cn_sc.sc_hwbase) {
237 dbgu_cn_sc.sc_attached = 1;
238 /* Make sure the console is always "hardwired". */
239 delay(10000); /* wait for output to finish */
240 SET(sc->sc_hwflags, COM_HW_CONSOLE);
241 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR);
242 SET(sc->sc_ier, DBGU_INT_RXRDY);
243 DBGUREG(DBGU_IER) = DBGU_INT_RXRDY; // @@@@@
244 }
245
246 tp = tty_alloc();
247 tp->t_oproc = at91dbgu_start;
248 tp->t_param = at91dbgu_param;
249 tp->t_hwiflow = at91dbgu_hwiflow;
250
251 sc->sc_tty = tp;
252 sc->sc_rbuf = kmem_alloc(AT91DBGU_RING_SIZE << 1, KM_SLEEP);
253 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf;
254 sc->sc_rbavail = AT91DBGU_RING_SIZE;
255 sc->sc_ebuf = sc->sc_rbuf + (AT91DBGU_RING_SIZE << 1);
256 sc->sc_tbc = 0;
257
258 tty_attach(tp);
259
260 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
261 int maj;
262
263 /* locate the major number */
264 maj = cdevsw_lookup_major(&at91dbgu_cdevsw);
265
266 cn_tab->cn_dev = makedev(maj, device_unit(sc->sc_dev));
267
268 aprint_normal("%s: console (maj %u min %u cn_dev %#"PRIx64")\n",
269 device_xname(sc->sc_dev), maj, device_unit(sc->sc_dev),
270 cn_tab->cn_dev);
271 }
272
273 sc->sc_si = softint_establish(SOFTINT_SERIAL, at91dbgu_soft, sc);
274
275 #ifdef RND_COM
276 rnd_attach_source(&sc->rnd_source, device_xname(sc->sc_dev),
277 RND_TYPE_TTY, RND_FLAG_DEFAULT);
278 #endif
279
280 /* if there are no enable/disable functions, assume the device
281 is always enabled */
282 if (!sc->enable)
283 sc->enabled = 1;
284
285 /* XXX configure register */
286 /* xxx_config(sc) */
287
288 SET(sc->sc_hwflags, COM_HW_DEV_OK);
289 }
290
291 static int
at91dbgu_param(struct tty * tp,struct termios * t)292 at91dbgu_param(struct tty *tp, struct termios *t)
293 {
294 struct at91dbgu_softc *sc
295 = device_lookup_private(&at91dbgu_cd, COMUNIT(tp->t_dev));
296 int s;
297
298 if (COM_ISALIVE(sc) == 0)
299 return (EIO);
300
301 if (t->c_ispeed && t->c_ispeed != t->c_ospeed)
302 return (EINVAL);
303
304 /*
305 * For the console, always force CLOCAL and !HUPCL, so that the port
306 * is always active.
307 */
308 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) ||
309 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
310 SET(t->c_cflag, CLOCAL);
311 CLR(t->c_cflag, HUPCL);
312 }
313
314 /*
315 * If there were no changes, don't do anything. This avoids dropping
316 * input and improves performance when all we did was frob things like
317 * VMIN and VTIME.
318 */
319 if (tp->t_ospeed == t->c_ospeed &&
320 tp->t_cflag == t->c_cflag)
321 return (0);
322
323 s = splserial();
324
325 sc->sc_brgr = (AT91_MSTCLK / 16 + t->c_ospeed / 2) / t->c_ospeed;
326
327 /* And copy to tty. */
328 tp->t_ispeed = 0;
329 tp->t_ospeed = t->c_ospeed;
330 tp->t_cflag = t->c_cflag;
331 at91dbgu_set(sc);
332
333 splx(s);
334
335 /*
336 * Update the tty layer's idea of the carrier bit.
337 * We tell tty the carrier is always on.
338 */
339 (void) (*tp->t_linesw->l_modem)(tp, 1);
340
341 #ifdef COM_DEBUG
342 if (com_debug)
343 comstatus(sc, "comparam ");
344 #endif
345
346 if (!ISSET(t->c_cflag, CHWFLOW)) {
347 if (sc->sc_tx_stopped) {
348 sc->sc_tx_stopped = 0;
349 at91dbgu_start(tp);
350 }
351 }
352
353 return (0);
354 }
355
356 static int
at91dbgu_hwiflow(struct tty * tp,int block)357 at91dbgu_hwiflow(struct tty *tp, int block)
358 {
359 return (0);
360 }
361
362 static void
at91dbgu_filltx(struct at91dbgu_softc * sc)363 at91dbgu_filltx(struct at91dbgu_softc *sc)
364 {
365 #if 0
366 bus_space_tag_t iot = sc->sc_iot;
367 bus_space_handle_t ioh = sc->sc_ioh;
368 #endif
369 int n;
370
371 n = 0;
372 while (DBGUREG(DBGU_SR) & DBGU_SR_TXRDY) {
373 if (n >= sc->sc_tbc)
374 break;
375 DBGUREG(DBGU_THR) = *(sc->sc_tba + n) & 0xff;
376 n++;
377 }
378 sc->sc_tbc -= n;
379 sc->sc_tba += n;
380 }
381
382 static void
at91dbgu_start(struct tty * tp)383 at91dbgu_start(struct tty *tp)
384 {
385 struct at91dbgu_softc *sc
386 = device_lookup_private(&at91dbgu_cd, COMUNIT(tp->t_dev));
387 int s;
388
389 if (COM_ISALIVE(sc) == 0)
390 return;
391
392 s = spltty();
393 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP))
394 goto out;
395 if (sc->sc_tx_stopped)
396 goto out;
397 if (!ttypull(tp))
398 goto out;
399
400 /* Grab the first contiguous region of buffer space. */
401 {
402 u_char *tba;
403 int tbc;
404
405 tba = tp->t_outq.c_cf;
406 tbc = ndqb(&tp->t_outq, 0);
407
408 (void)splserial();
409
410 sc->sc_tba = tba;
411 sc->sc_tbc = tbc;
412 }
413
414 SET(tp->t_state, TS_BUSY);
415 sc->sc_tx_busy = 1;
416
417 /* Output the first chunk of the contiguous buffer. */
418 at91dbgu_filltx(sc);
419
420 SET(sc->sc_ier, DBGU_INT_TXRDY);
421 DBGUREG(DBGU_IER) = DBGU_INT_TXRDY;
422
423 out:
424 splx(s);
425 return;
426 }
427
428 static void
at91dbgu_break(struct at91dbgu_softc * sc,int onoff)429 at91dbgu_break(struct at91dbgu_softc *sc, int onoff)
430 {
431 // @@@ we must disconnect the TX pin from the DBGU and control
432 // @@@ the pin directly to support this...
433 }
434
435 static void
at91dbgu_shutdown(struct at91dbgu_softc * sc)436 at91dbgu_shutdown(struct at91dbgu_softc *sc)
437 {
438 int s;
439
440 s = splserial();
441
442 /* Turn off interrupts. */
443 DBGUREG(DBGU_IDR) = -1;
444
445 /* Clear any break condition set with TIOCSBRK. */
446 at91dbgu_break(sc, 0);
447 at91dbgu_set(sc);
448
449 if (sc->disable) {
450 #ifdef DIAGNOSTIC
451 if (!sc->enabled)
452 panic("at91dbgu_shutdown: not enabled?");
453 #endif
454 (*sc->disable)(sc);
455 sc->enabled = 0;
456 }
457 splx(s);
458 }
459
460 int
at91dbgu_open(dev_t dev,int flag,int mode,struct lwp * l)461 at91dbgu_open(dev_t dev, int flag, int mode, struct lwp *l)
462 {
463 struct at91dbgu_softc *sc;
464 struct tty *tp;
465 int s, s2;
466 int error;
467
468 sc = device_lookup_private(&at91dbgu_cd, COMUNIT(dev));
469 if (sc == NULL || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK) ||
470 sc->sc_rbuf == NULL)
471 return (ENXIO);
472
473 if (!device_is_active(sc->sc_dev))
474 return (ENXIO);
475
476 #ifdef KGDB
477 /*
478 * If this is the kgdb port, no other use is permitted.
479 */
480 if (ISSET(sc->sc_hwflags, COM_HW_KGDB))
481 return (EBUSY);
482 #endif
483
484 tp = sc->sc_tty;
485
486 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp))
487 return (EBUSY);
488
489 s = spltty();
490
491 /*
492 * Do the following iff this is a first open.
493 */
494 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) {
495 struct termios t;
496
497 tp->t_dev = dev;
498
499 s2 = splserial();
500
501 if (sc->enable) {
502 if ((*sc->enable)(sc)) {
503 splx(s2);
504 splx(s);
505 printf("%s: device enable failed\n",
506 device_xname(sc->sc_dev));
507 return (EIO);
508 }
509 sc->enabled = 1;
510 #if 0
511 /* XXXXXXXXXXXXXXX */
512 com_config(sc);
513 #endif
514 }
515
516 /* Turn on interrupts. */
517 sc->sc_ier |= DBGU_INT_RXRDY;
518 DBGUREG(DBGU_IER) = DBGU_INT_RXRDY;
519
520 #if 0
521 /* Fetch the current modem control status, needed later. */
522 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr);
523
524 /* Clear PPS capture state on first open. */
525 sc->sc_ppsmask = 0;
526 sc->ppsparam.mode = 0;
527 #endif
528
529 splx(s2);
530
531 /*
532 * Initialize the termios status to the defaults. Add in the
533 * sticky bits from TIOCSFLAGS.
534 */
535 t.c_ispeed = 0;
536 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
537 t.c_ospeed = dbgu_cn_sc.sc_ospeed;
538 t.c_cflag = dbgu_cn_sc.sc_cflag;
539 } else {
540 t.c_ospeed = TTYDEF_SPEED;
541 t.c_cflag = TTYDEF_CFLAG;
542 }
543 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL))
544 SET(t.c_cflag, CLOCAL);
545 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS))
546 SET(t.c_cflag, CRTSCTS);
547 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF))
548 SET(t.c_cflag, MDMBUF);
549 /* Make sure at91dbgu_param() will do something. */
550 tp->t_ospeed = 0;
551 (void) at91dbgu_param(tp, &t);
552 tp->t_iflag = TTYDEF_IFLAG;
553 tp->t_oflag = TTYDEF_OFLAG;
554 tp->t_lflag = TTYDEF_LFLAG;
555 ttychars(tp);
556 ttsetwater(tp);
557
558 s2 = splserial();
559
560 /* Clear the input ring, and unblock. */
561 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf;
562 sc->sc_rbavail = AT91DBGU_RING_SIZE;
563 at91dbgu_iflush(sc);
564 CLR(sc->sc_rx_flags, RX_ANY_BLOCK);
565
566 #ifdef COM_DEBUG
567 if (at91dbgu_debug)
568 comstatus(sc, "at91dbgu_open ");
569 #endif
570
571 splx(s2);
572 }
573
574 splx(s);
575
576 error = ttyopen(tp, COMDIALOUT(dev), ISSET(flag, O_NONBLOCK));
577 if (error)
578 goto bad;
579
580 error = (*tp->t_linesw->l_open)(dev, tp);
581 if (error)
582 goto bad;
583
584 return (0);
585
586 bad:
587 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) {
588 /*
589 * We failed to open the device, and nobody else had it opened.
590 * Clean up the state as appropriate.
591 */
592 at91dbgu_shutdown(sc);
593 }
594
595 return (error);
596 }
597
598 int
at91dbgu_close(dev_t dev,int flag,int mode,struct lwp * l)599 at91dbgu_close(dev_t dev, int flag, int mode, struct lwp *l)
600 {
601 struct at91dbgu_softc *sc = device_lookup_private(&at91dbgu_cd, COMUNIT(dev));
602 struct tty *tp = sc->sc_tty;
603
604 /* XXX This is for cons.c. */
605 if (!ISSET(tp->t_state, TS_ISOPEN))
606 return (0);
607
608 (*tp->t_linesw->l_close)(tp, flag);
609 ttyclose(tp);
610
611 if (COM_ISALIVE(sc) == 0)
612 return (0);
613
614 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) {
615 /*
616 * Although we got a last close, the device may still be in
617 * use; e.g. if this was the dialout node, and there are still
618 * processes waiting for carrier on the non-dialout node.
619 */
620 at91dbgu_shutdown(sc);
621 }
622
623 return (0);
624 }
625
626 int
at91dbgu_read(dev_t dev,struct uio * uio,int flag)627 at91dbgu_read(dev_t dev, struct uio *uio, int flag)
628 {
629 struct at91dbgu_softc *sc = device_lookup_private(&at91dbgu_cd, COMUNIT(dev));
630 struct tty *tp = sc->sc_tty;
631
632 if (COM_ISALIVE(sc) == 0)
633 return (EIO);
634
635 return ((*tp->t_linesw->l_read)(tp, uio, flag));
636 }
637
638 int
at91dbgu_write(dev_t dev,struct uio * uio,int flag)639 at91dbgu_write(dev_t dev, struct uio *uio, int flag)
640 {
641 struct at91dbgu_softc *sc = device_lookup_private(&at91dbgu_cd, COMUNIT(dev));
642 struct tty *tp = sc->sc_tty;
643
644 if (COM_ISALIVE(sc) == 0)
645 return (EIO);
646
647 return ((*tp->t_linesw->l_write)(tp, uio, flag));
648 }
649
650 int
at91dbgu_poll(dev_t dev,int events,struct lwp * l)651 at91dbgu_poll(dev_t dev, int events, struct lwp *l)
652 {
653 struct at91dbgu_softc *sc = device_lookup_private(&at91dbgu_cd, COMUNIT(dev));
654 struct tty *tp = sc->sc_tty;
655
656 if (COM_ISALIVE(sc) == 0)
657 return (EIO);
658
659 return ((*tp->t_linesw->l_poll)(tp, events, l));
660 }
661
662 struct tty *
at91dbgu_tty(dev_t dev)663 at91dbgu_tty(dev_t dev)
664 {
665 struct at91dbgu_softc *sc = device_lookup_private(&at91dbgu_cd, COMUNIT(dev));
666 struct tty *tp = sc->sc_tty;
667
668 return (tp);
669 }
670
671 int
at91dbgu_ioctl(dev_t dev,u_long cmd,void * data,int flag,struct lwp * l)672 at91dbgu_ioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
673 {
674 struct at91dbgu_softc *sc = device_lookup_private(&at91dbgu_cd, COMUNIT(dev));
675 struct tty *tp = sc->sc_tty;
676 int error;
677 int s;
678
679 if (COM_ISALIVE(sc) == 0)
680 return (EIO);
681
682 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l);
683 if (error != EPASSTHROUGH)
684 return (error);
685
686 error = ttioctl(tp, cmd, data, flag, l);
687 if (error != EPASSTHROUGH)
688 return (error);
689
690 error = 0;
691
692 s = splserial();
693
694 switch (cmd) {
695 case TIOCSBRK:
696 at91dbgu_break(sc, 1);
697 break;
698
699 case TIOCCBRK:
700 at91dbgu_break(sc, 0);
701 break;
702
703 case TIOCGFLAGS:
704 *(int *)data = sc->sc_swflags;
705 break;
706
707 case TIOCSFLAGS:
708 error = kauth_authorize_device_tty(l->l_cred,
709 KAUTH_DEVICE_TTY_PRIVSET, tp);
710 if (error)
711 break;
712 sc->sc_swflags = *(int *)data;
713 break;
714
715 default:
716 error = EPASSTHROUGH;
717 break;
718 }
719
720 splx(s);
721
722 return (error);
723 }
724
725 /*
726 * Stop output on a line.
727 */
728 void
at91dbgu_stop(struct tty * tp,int flag)729 at91dbgu_stop(struct tty *tp, int flag)
730 {
731 struct at91dbgu_softc *sc
732 = device_lookup_private(&at91dbgu_cd, COMUNIT(tp->t_dev));
733 int s;
734
735 s = splserial();
736 if (ISSET(tp->t_state, TS_BUSY)) {
737 /* Stop transmitting at the next chunk. */
738 sc->sc_tbc = 0;
739 if (!ISSET(tp->t_state, TS_TTSTOP))
740 SET(tp->t_state, TS_FLUSH);
741 }
742 splx(s);
743 }
744
745 #if 0
746 static u_int
747 cflag2lcrhi(tcflag_t cflag)
748 {
749 uint32_t mr;
750
751 switch (cflag & CSIZE) {
752 default:
753 mr = 0x0;
754 break;
755 }
756 #if 0
757 mr |= (cflag & PARENB) ? LinCtrlHigh_PEN : 0;
758 mr |= (cflag & PARODD) ? 0 : LinCtrlHigh_EPS;
759 mr |= (cflag & CSTOPB) ? LinCtrlHigh_STP2 : 0;
760 mr |= LinCtrlHigh_FEN; /* FIFO always enabled */
761 #endif
762 mr |= DBGU_MR_PAR_NONE;
763 return (mr);
764 }
765 #endif
766
767 static void
at91dbgu_iflush(struct at91dbgu_softc * sc)768 at91dbgu_iflush(struct at91dbgu_softc *sc)
769 {
770 #if 0
771 bus_space_tag_t iot = sc->sc_iot;
772 bus_space_handle_t ioh = sc->sc_ioh;
773 #endif
774 #ifdef DIAGNOSTIC
775 int reg;
776 #endif
777 int timo;
778
779 #ifdef DIAGNOSTIC
780 reg = 0xffff;
781 #endif
782 timo = 50000;
783 /* flush any pending I/O */
784 while (DBGUREG(DBGU_SR) & DBGU_SR_RXRDY
785 && --timo)
786 #ifdef DIAGNOSTIC
787 reg =
788 #else
789 (void)
790 #endif
791 DBGUREG(DBGU_RHR);
792 #ifdef DIAGNOSTIC
793 if (!timo)
794 printf("%s: com_iflush timeout %02x\n", device_xname(sc->sc_dev),
795 reg);
796 #endif
797 }
798
799 static void
at91dbgu_set(struct at91dbgu_softc * sc)800 at91dbgu_set(struct at91dbgu_softc *sc)
801 {
802 DBGUREG(DBGU_MR) = DBGU_MR_PAR_NONE;
803 DBGUREG(DBGU_BRGR) = sc->sc_brgr;
804 DBGUREG(DBGU_CR) = DBGU_CR_TXEN | DBGU_CR_RXEN; // @@@ just in case
805 }
806
807 void
808 at91dbgu_cn_attach(bus_space_tag_t iot, bus_addr_t iobase, bus_space_handle_t ioh,
809 int ospeed, tcflag_t cflag);
810 void
at91dbgu_cn_attach(bus_space_tag_t iot,bus_addr_t iobase,bus_space_handle_t ioh,int ospeed,tcflag_t cflag)811 at91dbgu_cn_attach(bus_space_tag_t iot, bus_addr_t iobase, bus_space_handle_t ioh,
812 int ospeed, tcflag_t cflag)
813 {
814 cn_tab = &at91dbgu_cons;
815 cn_init_magic(&at91dbgu_cnm_state);
816 cn_set_magic("\047\001");
817
818 dbgu_cn_sc.sc_iot = iot;
819 dbgu_cn_sc.sc_ioh = ioh;
820 dbgu_cn_sc.sc_hwbase = iobase;
821 dbgu_cn_sc.sc_ospeed = ospeed;
822 dbgu_cn_sc.sc_cflag = cflag;
823
824 DBGU_INIT(AT91_MSTCLK, ospeed);
825 }
826
at91dbgu_attach_cn(bus_space_tag_t iot,int ospeed,int cflag)827 void at91dbgu_attach_cn(bus_space_tag_t iot, int ospeed, int cflag)
828 {
829 bus_space_handle_t ioh;
830 bus_space_map(iot, AT91DBGU_BASE, AT91DBGU_SIZE, 0, &ioh);
831 at91dbgu_cn_attach(iot, AT91DBGU_BASE, ioh, ospeed, cflag);
832 }
833
834 void
at91dbgu_cn_probe(struct consdev * cp)835 at91dbgu_cn_probe(struct consdev *cp)
836 {
837 cp->cn_pri = CN_REMOTE;
838 }
839
840 void
at91dbgu_cn_pollc(dev_t dev,int on)841 at91dbgu_cn_pollc(dev_t dev, int on)
842 {
843 if (on) {
844 // enable polling mode
845 DBGUREG(DBGU_IDR) = DBGU_INT_RXRDY;
846 } else {
847 // disable polling mode
848 DBGUREG(DBGU_IER) = DBGU_INT_RXRDY;
849 }
850 }
851
852 void
at91dbgu_cn_putc(dev_t dev,int c)853 at91dbgu_cn_putc(dev_t dev, int c)
854 {
855 #if 0
856 bus_space_tag_t iot = dbgu_cn_sc.sc_iot;
857 bus_space_handle_t ioh = dbgu_cn_sc.sc_ioh;
858 #endif
859 DBGU_PUTC(c);
860
861 #ifdef DEBUG
862 if (c == '\r') {
863 int s = splserial();
864 while((DBGUREG(DBGU_SR) & DBGU_SR_TXEMPTY) == 0) {
865 splx(s);
866 s = splserial();
867 }
868 splx(s);
869 }
870 #endif
871
872 }
873
874 int
at91dbgu_cn_getc(dev_t dev)875 at91dbgu_cn_getc(dev_t dev)
876 {
877 int c, sr;
878 int s;
879 #if 0
880 bus_space_tag_t iot = dbgu_cn_sc.sc_iot;
881 bus_space_handle_t ioh = dbgu_cn_sc.sc_ioh;
882 #endif
883
884 s = splserial();
885
886 while ((c = DBGU_PEEKC()) == -1) {
887 splx(s);
888 s = splserial();
889 }
890 ;
891 sr = DBGUREG(DBGU_SR);
892 if (ISSET(sr, DBGU_SR_FRAME) && c == 0) {
893 DBGUREG(DBGU_CR) = DBGU_CR_RSTSTA; // reset status bits
894 c = CNC_BREAK;
895 }
896 if (!db_active) {
897 int cn_trapped __unused = 0;
898
899 cn_check_magic(dev, c, at91dbgu_cnm_state);
900 }
901 splx(s);
902
903 c &= 0xff;
904
905 return (c);
906 }
907
908 inline static void
at91dbgu_txsoft(struct at91dbgu_softc * sc,struct tty * tp)909 at91dbgu_txsoft(struct at91dbgu_softc *sc, struct tty *tp)
910 {
911 CLR(tp->t_state, TS_BUSY);
912 if (ISSET(tp->t_state, TS_FLUSH))
913 CLR(tp->t_state, TS_FLUSH);
914 else
915 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf));
916 (*tp->t_linesw->l_start)(tp);
917 }
918
919 inline static void
at91dbgu_rxsoft(struct at91dbgu_softc * sc,struct tty * tp)920 at91dbgu_rxsoft(struct at91dbgu_softc *sc, struct tty *tp)
921 {
922 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint;
923 u_char *get, *end;
924 u_int cc, scc;
925 u_char sts;
926 int code;
927 int s;
928
929 end = sc->sc_ebuf;
930 get = sc->sc_rbget;
931 scc = cc = AT91DBGU_RING_SIZE - sc->sc_rbavail;
932 #if 0
933 if (cc == AT91DBGU_RING_SIZE) {
934 sc->sc_floods++;
935 if (sc->sc_errors++ == 0)
936 callout_reset(&sc->sc_diag_callout, 60 * hz,
937 comdiag, sc);
938 }
939 #endif
940 while (cc) {
941 code = get[0];
942 sts = get[1];
943 if (ISSET(sts, DBGU_SR_PARE | DBGU_SR_FRAME | DBGU_SR_OVRE)) {
944 #if 0
945 if (ISSET(lsr, DR_ROR)) {
946 sc->sc_overflows++;
947 if (sc->sc_errors++ == 0)
948 callout_reset(&sc->sc_diag_callout,
949 60 * hz, comdiag, sc);
950 }
951 #endif
952 if (ISSET(sts, (DBGU_SR_FRAME | DBGU_SR_OVRE)))
953 SET(code, TTY_FE);
954 if (ISSET(sts, DBGU_SR_PARE))
955 SET(code, TTY_PE);
956 }
957 if ((*rint)(code, tp) == -1) {
958 /*
959 * The line discipline's buffer is out of space.
960 */
961 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) {
962 /*
963 * We're either not using flow control, or the
964 * line discipline didn't tell us to block for
965 * some reason. Either way, we have no way to
966 * know when there's more space available, so
967 * just drop the rest of the data.
968 */
969 get += cc << 1;
970 if (get >= end)
971 get -= AT91DBGU_RING_SIZE << 1;
972 cc = 0;
973 } else {
974 /*
975 * Don't schedule any more receive processing
976 * until the line discipline tells us there's
977 * space available (through comhwiflow()).
978 * Leave the rest of the data in the input
979 * buffer.
980 */
981 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED);
982 }
983 break;
984 }
985 get += 2;
986 if (get >= end)
987 get = sc->sc_rbuf;
988 cc--;
989 }
990
991 if (cc != scc) {
992 sc->sc_rbget = get;
993 s = splserial();
994
995 cc = sc->sc_rbavail += scc - cc;
996 /* Buffers should be ok again, release possible block. */
997 if (cc >= 1) {
998 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) {
999 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED);
1000 DBGUREG(DBGU_IER) = DBGU_INT_RXRDY;
1001 }
1002 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) {
1003 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED);
1004 #if 0
1005 com_hwiflow(sc);
1006 #endif
1007 }
1008 }
1009 splx(s);
1010 }
1011 }
1012
1013 static void
at91dbgu_soft(void * arg)1014 at91dbgu_soft(void* arg)
1015 {
1016 struct at91dbgu_softc *sc = arg;
1017
1018 if (COM_ISALIVE(sc) == 0)
1019 return;
1020
1021 if (sc->sc_rx_ready) {
1022 sc->sc_rx_ready = 0;
1023 at91dbgu_rxsoft(sc, sc->sc_tty);
1024 }
1025 if (sc->sc_tx_done) {
1026 sc->sc_tx_done = 0;
1027 at91dbgu_txsoft(sc, sc->sc_tty);
1028 }
1029 }
1030
1031
1032 static int
dbgu_intr(void * arg)1033 dbgu_intr(void* arg)
1034 {
1035 struct at91dbgu_softc *sc = arg;
1036 #if 0
1037 bus_space_tag_t iot = sc->sc_iot;
1038 bus_space_handle_t ioh = sc->sc_ioh;
1039 #endif
1040 u_char *put, *end;
1041 u_int cc;
1042 uint32_t imr, sr;
1043 int c = 0;
1044 imr = DBGUREG(DBGU_IMR);
1045 #if 0
1046 if (!imr)
1047 return 0;
1048 #endif
1049 sr = DBGUREG(DBGU_SR);
1050 if (!(sr & imr)) {
1051 if (sr & DBGU_SR_RXRDY) {
1052 // printf("sr=0x%08x imr=0x%08x\n", sr, imr);
1053 }
1054 return 0;
1055 }
1056
1057 end = sc->sc_ebuf;
1058 put = sc->sc_rbput;
1059 cc = sc->sc_rbavail;
1060
1061 // ok, we DO have some interrupts to serve!
1062 if (sr & DBGU_SR_RXRDY) {
1063 int cn_trapped = 0;
1064
1065 c = DBGUREG(DBGU_RHR);
1066 if (ISSET(sr, (DBGU_SR_OVRE | DBGU_SR_FRAME | DBGU_SR_PARE)))
1067 DBGUREG(DBGU_CR) = DBGU_CR_RSTSTA;
1068 if (ISSET(sr, DBGU_SR_FRAME) && c == 0) {
1069 c = CNC_BREAK;
1070 }
1071 if (!db_active)
1072 cn_check_magic(cn_tab->cn_dev, c, at91dbgu_cnm_state);
1073 if (!cn_trapped && cc) {
1074 put[0] = c & 0xff;
1075 put[1] = sr & 0xff;
1076 put += 2;
1077 if (put >= end)
1078 put = sc->sc_rbuf;
1079 cc--;
1080 /*
1081 * Current string of incoming characters ended because
1082 * no more data was available or we ran out of space.
1083 * Schedule a receive event if any data was received.
1084 * If we're out of space, turn off receive interrupts.
1085 */
1086 sc->sc_rbput = put;
1087 sc->sc_rbavail = cc;
1088 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED))
1089 sc->sc_rx_ready = 1;
1090
1091 /*
1092 * See if we are in danger of overflowing a buffer. If
1093 * so, use hardware flow control to ease the pressure.
1094 */
1095
1096 /* but at91dbgu cannot (yet). X-( */
1097
1098 /*
1099 * If we're out of space, disable receive interrupts
1100 * until the queue has drained a bit.
1101 */
1102 if (!cc) {
1103 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED);
1104 }
1105 }
1106 }
1107
1108 /*
1109 * Done handling any receive interrupts. See if data can be
1110 * transmitted as well. Schedule tx done event if no data left
1111 * and tty was marked busy.
1112 */
1113
1114 if (ISSET(sr, DBGU_SR_TXRDY) && sc->sc_tbc > 0) {
1115 /* Output the next chunk of the contiguous buffer, if any. */
1116 at91dbgu_filltx(sc);
1117 } else {
1118 /* Disable transmit completion interrupts if necessary. */
1119 DBGUREG(DBGU_IDR) = DBGU_INT_TXRDY;
1120 if (sc->sc_tx_busy) {
1121 sc->sc_tx_busy = 0;
1122 sc->sc_tx_done = 1;
1123 }
1124 }
1125
1126 /* Wake up the poller. */
1127 softint_schedule(sc->sc_si);
1128 #if 0
1129 #ifdef RND_COM
1130 rnd_add_uint32(&sc->rnd_source, imr ^ sr ^ c);
1131 #endif
1132 #endif
1133
1134 return (1);
1135 }
1136