1 /* $OpenBSD: z8530tty.c,v 1.32 2020/01/09 14:35:19 mpi Exp $ */
2 /* $NetBSD: z8530tty.c,v 1.77 2001/05/30 15:24:24 lukem Exp $ */
3
4 /*-
5 * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998, 1999
6 * Charles M. Hannum. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by Charles M. Hannum.
19 * 4. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 /*
35 * Copyright (c) 1994 Gordon W. Ross
36 * Copyright (c) 1992, 1993
37 * The Regents of the University of California. All rights reserved.
38 *
39 * This software was developed by the Computer Systems Engineering group
40 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
41 * contributed to Berkeley.
42 *
43 * All advertising materials mentioning features or use of this software
44 * must display the following acknowledgement:
45 * This product includes software developed by the University of
46 * California, Lawrence Berkeley Laboratory.
47 *
48 * Redistribution and use in source and binary forms, with or without
49 * modification, are permitted provided that the following conditions
50 * are met:
51 * 1. Redistributions of source code must retain the above copyright
52 * notice, this list of conditions and the following disclaimer.
53 * 2. Redistributions in binary form must reproduce the above copyright
54 * notice, this list of conditions and the following disclaimer in the
55 * documentation and/or other materials provided with the distribution.
56 * 3. Neither the name of the University nor the names of its contributors
57 * may be used to endorse or promote products derived from this software
58 * without specific prior written permission.
59 *
60 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
61 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
62 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
63 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
64 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
65 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
66 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
70 * SUCH DAMAGE.
71 *
72 * @(#)zs.c 8.1 (Berkeley) 7/19/93
73 */
74
75 /*
76 * Zilog Z8530 Dual UART driver (tty interface)
77 *
78 * This is the "slave" driver that will be attached to
79 * the "zsc" driver for plain "tty" async. serial lines.
80 *
81 * Credits, history:
82 *
83 * The original version of this code was the sparc/dev/zs.c driver
84 * as distributed with the Berkeley 4.4 Lite release. Since then,
85 * Gordon Ross reorganized the code into the current parent/child
86 * driver scheme, separating the Sun keyboard and mouse support
87 * into independent child drivers.
88 *
89 * RTS/CTS flow-control support was a collaboration of:
90 * Gordon Ross <gwr@NetBSD.org>,
91 * Bill Studenmund <wrstuden@loki.stanford.edu>
92 * Ian Dall <Ian.Dall@dsto.defence.gov.au>
93 *
94 * The driver was massively overhauled in November 1997 by Charles Hannum,
95 * fixing *many* bugs, and substantially improving performance.
96 */
97
98 #include <sys/param.h>
99 #include <sys/systm.h>
100 #include <sys/proc.h>
101 #include <sys/device.h>
102 #include <sys/conf.h>
103 #include <sys/fcntl.h>
104 #include <sys/ioctl.h>
105 #include <sys/malloc.h>
106 #include <sys/tty.h>
107 #include <sys/time.h>
108 #include <sys/kernel.h>
109 #include <sys/syslog.h>
110
111 #include <dev/ic/z8530reg.h>
112 #include <machine/z8530var.h>
113
114 #include <dev/cons.h>
115
116 /*
117 * Allow the MD var.h to override the default CFLAG so that
118 * console messages during boot come out with correct parity.
119 */
120 #ifndef ZSTTY_DEF_CFLAG
121 #define ZSTTY_DEF_CFLAG TTYDEF_CFLAG
122 #endif
123
124 /*
125 * How many input characters we can buffer.
126 * The port-specific var.h may override this.
127 * Note: must be a power of two!
128 */
129 #ifndef ZSTTY_RING_SIZE
130 #define ZSTTY_RING_SIZE 2048
131 #endif
132
133 struct cfdriver zstty_cd = {
134 NULL, "zstty", DV_TTY
135 };
136
137 /*
138 * Make this an option variable one can patch.
139 * But be warned: this must be a power of 2!
140 */
141 u_int zstty_rbuf_size = ZSTTY_RING_SIZE;
142
143 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */
144 u_int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE * 1) / 4;
145 u_int zstty_rbuf_lowat = (ZSTTY_RING_SIZE * 3) / 4;
146
147 struct zstty_softc {
148 struct device zst_dev; /* required first: base device */
149 struct tty *zst_tty;
150 struct zs_chanstate *zst_cs;
151
152 struct timeout zst_diag_ch;
153
154 u_int zst_overflows,
155 zst_floods,
156 zst_errors;
157
158 int zst_hwflags, /* see z8530var.h */
159 zst_swflags; /* TIOCFLAG_SOFTCAR, ... <ttycom.h> */
160
161 u_int zst_r_hiwat,
162 zst_r_lowat;
163 uint8_t *volatile zst_rbget,
164 *volatile zst_rbput;
165 volatile u_int zst_rbavail;
166 uint8_t *zst_rbuf,
167 *zst_ebuf;
168
169 /*
170 * The transmit byte count and address are used for pseudo-DMA
171 * output in the hardware interrupt code. PDMA can be suspended
172 * to get pending changes done; heldtbc is used for this. It can
173 * also be stopped for ^S; this sets TS_TTSTOP in tp->t_state.
174 */
175 uint8_t *zst_tba; /* transmit buffer address */
176 u_int zst_tbc, /* transmit byte count */
177 zst_heldtbc; /* held tbc while xmission stopped */
178
179 /* Flags to communicate with zstty_softint() */
180 volatile uint8_t zst_rx_flags, /* receiver blocked */
181 #define RX_TTY_BLOCKED 0x01
182 #define RX_TTY_OVERFLOWED 0x02
183 #define RX_IBUF_BLOCKED 0x04
184 #define RX_IBUF_OVERFLOWED 0x08
185 #define RX_ANY_BLOCK 0x0f
186 zst_tx_busy, /* working on an output chunk */
187 zst_tx_done, /* done with one output chunk */
188 zst_tx_stopped, /* H/W level stop (lost CTS) */
189 zst_st_check, /* got a status interrupt */
190 zst_rx_ready;
191
192 /* PPS signal on DCD, with or without inkernel clock disciplining */
193 uint8_t zst_ppsmask; /* pps signal mask */
194 uint8_t zst_ppsassert; /* pps leading edge */
195 uint8_t zst_ppsclear; /* pps trailing edge */
196 };
197
198 /* Definition of the driver for autoconfig. */
199 int zstty_match(struct device *, void *, void *);
200 void zstty_attach(struct device *, struct device *, void *);
201
202 const struct cfattach zstty_ca = {
203 sizeof(struct zstty_softc), zstty_match, zstty_attach
204 };
205
206 cdev_decl(zs);
207
208 struct zsops zsops_tty;
209
210 void zs_shutdown(struct zstty_softc *);
211 void zsstart(struct tty *);
212 int zsparam(struct tty *, struct termios *);
213 void zs_modem(struct zstty_softc *, int);
214 void tiocm_to_zs(struct zstty_softc *, u_long, int);
215 int zs_to_tiocm(struct zstty_softc *);
216 int zshwiflow(struct tty *, int);
217 void zs_hwiflow(struct zstty_softc *);
218 void zs_maskintr(struct zstty_softc *);
219
220 struct zstty_softc *zs_device_lookup(struct cfdriver *, int);
221
222 /* Low-level routines. */
223 void zstty_rxint(struct zs_chanstate *);
224 void zstty_stint(struct zs_chanstate *, int);
225 void zstty_txint(struct zs_chanstate *);
226 void zstty_softint(struct zs_chanstate *);
227 void zstty_diag(void *);
228
229 #define ZSUNIT(x) (minor(x) & 0x7f)
230 #define ZSDIALOUT(x) (minor(x) & 0x80)
231
232 struct zstty_softc *
zs_device_lookup(struct cfdriver * cf,int unit)233 zs_device_lookup(struct cfdriver *cf, int unit)
234 {
235 return (struct zstty_softc *)device_lookup(cf, unit);
236 }
237
238 /*
239 * zstty_match: how is this zs channel configured?
240 */
241 int
zstty_match(struct device * parent,void * vcf,void * aux)242 zstty_match(struct device *parent, void *vcf, void *aux)
243 {
244 struct cfdata *cf = vcf;
245 struct zsc_attach_args *args = aux;
246
247 /* Exact match is better than wildcard. */
248 if (cf->cf_loc[0] == args->channel)
249 return 2;
250
251 /* This driver accepts wildcard. */
252 if (cf->cf_loc[0] == -1)
253 return 1;
254
255 return 0;
256 }
257
258 void
zstty_attach(struct device * parent,struct device * self,void * aux)259 zstty_attach(struct device *parent, struct device *self, void *aux)
260 {
261 struct zsc_softc *zsc = (struct zsc_softc *)parent;
262 struct zstty_softc *zst = (struct zstty_softc *)self;
263 struct cfdata *cf = self->dv_cfdata;
264 struct zsc_attach_args *args = aux;
265 struct zs_chanstate *cs;
266 struct tty *tp;
267 int channel, s, tty_unit;
268 dev_t dev;
269 const char *i, *o;
270 int dtr_on;
271 int resetbit;
272
273 timeout_set(&zst->zst_diag_ch, zstty_diag, zst);
274
275 tty_unit = zst->zst_dev.dv_unit;
276 channel = args->channel;
277 cs = zsc->zsc_cs[channel];
278 cs->cs_private = zst;
279 cs->cs_ops = &zsops_tty;
280
281 zst->zst_cs = cs;
282 zst->zst_swflags = cf->cf_flags; /* softcar, etc. */
283 zst->zst_hwflags = args->hwflags;
284 dev = makedev(zs_major, tty_unit);
285
286 if (zst->zst_swflags)
287 printf(" flags 0x%x", zst->zst_swflags);
288
289 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_NO_DCD))
290 SET(zst->zst_swflags, TIOCFLAG_SOFTCAR);
291
292 /*
293 * Check whether we serve as a console device.
294 * XXX - split console input/output channels aren't
295 * supported yet on /dev/console
296 */
297 i = o = NULL;
298 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) != 0) {
299 i = " input";
300 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) {
301 args->consdev->cn_dev = dev;
302 cn_tab->cn_pollc = args->consdev->cn_pollc;
303 cn_tab->cn_getc = args->consdev->cn_getc;
304 }
305 cn_tab->cn_dev = dev;
306 }
307 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_OUTPUT) != 0) {
308 o = " output";
309 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) {
310 cn_tab->cn_putc = args->consdev->cn_putc;
311 }
312 cn_tab->cn_dev = dev;
313 }
314 if (i != NULL || o != NULL) {
315 printf(": console%s", i ? (o ? "" : i) : o);
316 }
317
318 #if defined(__sparc64__)
319 if (strcmp(args->type, "keyboard") == 0 ||
320 strcmp(args->type, "mouse") == 0)
321 printf(": %s", args->type);
322 #endif
323
324 printf("\n");
325
326 tp = ttymalloc(0);
327 tp->t_dev = dev;
328 tp->t_oproc = zsstart;
329 tp->t_param = zsparam;
330 tp->t_hwiflow = zshwiflow;
331
332 zst->zst_tty = tp;
333 zst->zst_rbuf = mallocarray(zstty_rbuf_size, 2, M_DEVBUF, M_WAITOK);
334 zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size * 2);
335 /* Disable the high water mark. */
336 zst->zst_r_hiwat = 0;
337 zst->zst_r_lowat = 0;
338 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf;
339 zst->zst_rbavail = zstty_rbuf_size;
340
341 /* if there are no enable/disable functions, assume the device
342 is always enabled */
343 if (!cs->enable)
344 cs->enabled = 1;
345
346 /*
347 * Hardware init
348 */
349 dtr_on = 0;
350 resetbit = 0;
351 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) {
352 /* Call zsparam similar to open. */
353 struct termios t;
354
355 /* Wait a while for previous console output to complete */
356 DELAY(10000);
357
358 /* Setup the "new" parameters in t. */
359 t.c_ispeed = 0;
360 t.c_ospeed = cs->cs_defspeed;
361 t.c_cflag = cs->cs_defcflag;
362
363 s = splzs();
364
365 /*
366 * Turn on receiver and status interrupts.
367 * We defer the actual write of the register to zsparam(),
368 * but we must make sure status interrupts are turned on by
369 * the time zsparam() reads the initial rr0 state.
370 */
371 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_TIE | ZSWR1_SIE);
372
373 splx(s);
374
375 /* Make sure zsparam will see changes. */
376 tp->t_ospeed = 0;
377 (void)zsparam(tp, &t);
378
379 /* Make sure DTR is on now. */
380 dtr_on = 1;
381 } else if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_NORESET)) {
382 /* Not the console; may need reset. */
383 resetbit = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET;
384 }
385
386 s = splzs();
387 if (resetbit)
388 zs_write_reg(cs, 9, resetbit);
389 zs_modem(zst, dtr_on);
390 splx(s);
391 }
392
393
394 /*
395 * Return pointer to our tty.
396 */
397 struct tty *
zstty(dev_t dev)398 zstty(dev_t dev)
399 {
400 struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(dev));
401
402 return (zst->zst_tty);
403 }
404
405
406 void
zs_shutdown(struct zstty_softc * zst)407 zs_shutdown(struct zstty_softc *zst)
408 {
409 struct zs_chanstate *cs = zst->zst_cs;
410 struct tty *tp = zst->zst_tty;
411 int s;
412
413 s = splzs();
414
415 /* If we were asserting flow control, then deassert it. */
416 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED);
417 zs_hwiflow(zst);
418
419 /* Clear any break condition set with TIOCSBRK. */
420 zs_break(cs, 0);
421
422 /* Turn off PPS capture on last close. */
423 zst->zst_ppsmask = 0;
424
425 /*
426 * Hang up if necessary. Wait a bit, so the other side has time to
427 * notice even if we immediately open the port again.
428 */
429 if (ISSET(tp->t_cflag, HUPCL) || ISSET(tp->t_state, TS_WOPEN)) {
430 zs_modem(zst, 0);
431 /* hold low for 1 second */
432 tsleep_nsec(cs, TTIPRI, ttclos, SEC_TO_NSEC(1));
433 }
434
435 /* Turn off interrupts if not the console. */
436 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) {
437 CLR(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_TIE | ZSWR1_SIE);
438 cs->cs_creg[1] = cs->cs_preg[1];
439 zs_write_reg(cs, 1, cs->cs_creg[1]);
440 }
441
442 /* Call the power management hook. */
443 if (cs->disable) {
444 #ifdef DIAGNOSTIC
445 if (!cs->enabled)
446 panic("%s: not enabled?", __func__);
447 #endif
448 (*cs->disable)(zst->zst_cs);
449 }
450
451 splx(s);
452 }
453
454 /*
455 * Open a zs serial (tty) port.
456 */
457 int
zsopen(dev_t dev,int flags,int mode,struct proc * p)458 zsopen(dev_t dev, int flags, int mode, struct proc *p)
459 {
460 struct zstty_softc *zst;
461 struct zs_chanstate *cs;
462 struct tty *tp;
463 int s;
464 #if IPL_ZS != IPL_TTY
465 int s2;
466 #endif
467 int error;
468
469 zst = zs_device_lookup(&zstty_cd, ZSUNIT(dev));
470 if (zst == NULL)
471 return (ENXIO);
472
473 tp = zst->zst_tty;
474 cs = zst->zst_cs;
475
476 /* If KGDB took the line, then tp==NULL */
477 if (tp == NULL)
478 return (EBUSY);
479
480 if (ISSET(tp->t_state, TS_ISOPEN) &&
481 ISSET(tp->t_state, TS_XCLUDE) &&
482 suser(p) != 0)
483 return (EBUSY);
484
485 s = spltty();
486
487 /*
488 * Do the following iff this is a first open.
489 */
490 if (!ISSET(tp->t_state, TS_ISOPEN)) {
491 struct termios t;
492
493 tp->t_dev = dev;
494
495 /* Call the power management hook. */
496 if (cs->enable) {
497 if ((*cs->enable)(cs)) {
498 splx(s);
499 printf("%s: device enable failed\n",
500 zst->zst_dev.dv_xname);
501 return (EIO);
502 }
503 }
504
505 /*
506 * Initialize the termios status to the defaults. Add in the
507 * sticky bits from TIOCSFLAGS.
508 */
509 t.c_ispeed = 0;
510 t.c_ospeed = cs->cs_defspeed;
511 t.c_cflag = cs->cs_defcflag;
512 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL))
513 SET(t.c_cflag, CLOCAL);
514 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS))
515 SET(t.c_cflag, CRTSCTS);
516 if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF))
517 SET(t.c_cflag, MDMBUF);
518
519 #if IPL_ZS != IPL_TTY
520 s2 = splzs();
521 #endif
522
523 /*
524 * Turn on receiver and status interrupts.
525 * We defer the actual write of the register to zsparam(),
526 * but we must make sure status interrupts are turned on by
527 * the time zsparam() reads the initial rr0 state.
528 */
529 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_TIE | ZSWR1_SIE);
530
531 /* Clear PPS capture state on first open. */
532 zst->zst_ppsmask = 0;
533
534 #if IPL_ZS != IPL_TTY
535 splx(s2);
536 #endif
537
538 /* Make sure zsparam will see changes. */
539 tp->t_ospeed = 0;
540 (void)zsparam(tp, &t);
541
542 /*
543 * Note: zsparam has done: cflag, ispeed, ospeed
544 * so we just need to do: iflag, oflag, lflag, cc
545 * For "raw" mode, just leave all zeros.
546 */
547 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) {
548 tp->t_iflag = TTYDEF_IFLAG;
549 tp->t_oflag = TTYDEF_OFLAG;
550 tp->t_lflag = TTYDEF_LFLAG;
551 } else {
552 tp->t_iflag = 0;
553 tp->t_oflag = 0;
554 tp->t_lflag = 0;
555 }
556 ttychars(tp);
557 ttsetwater(tp);
558
559 if (ZSDIALOUT(dev))
560 SET(tp->t_state, TS_CARR_ON);
561 else
562 CLR(tp->t_state, TS_CARR_ON);
563
564 #if IPL_ZS != IPL_TTY
565 s2 = splzs();
566 #endif
567
568 /* Clear the input ring, and unblock. */
569 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf;
570 zst->zst_rbavail = zstty_rbuf_size;
571 zs_iflush(cs);
572 CLR(zst->zst_rx_flags, RX_ANY_BLOCK);
573 zs_hwiflow(zst);
574
575 #if IPL_ZS != IPL_TTY
576 splx(s2);
577 #endif
578 }
579
580 if (ZSDIALOUT(dev)) {
581 if (ISSET(tp->t_state, TS_ISOPEN)) {
582 /* someone already is dialed in... */
583 splx(s);
584 return EBUSY;
585 }
586 cs->cs_cua = 1;
587 }
588
589 error = 0;
590 /* wait for carrier if necessary */
591 if (ISSET(flags, O_NONBLOCK)) {
592 if (!ZSDIALOUT(dev) && cs->cs_cua) {
593 /* Opening TTY non-blocking... but the CUA is busy */
594 error = EBUSY;
595 }
596 } else
597 while (cs->cs_cua ||
598 (!ISSET(tp->t_cflag, CLOCAL) && !ISSET(tp->t_state, TS_CARR_ON))) {
599 int rr0;
600
601 error = 0;
602 SET(tp->t_state, TS_WOPEN);
603
604 if (!ZSDIALOUT(dev) && !cs->cs_cua) {
605 /*
606 * Turn on DTR. We must always do this on non-CUA
607 * devices, even if carrier is not present, because
608 * otherwise we'd have to use TIOCSDTR immediately
609 * after setting CLOCAL, which applications do not
610 * expect. We always assert DTR while the device is
611 * open unless explicitly requested to deassert it.
612 */
613 #if IPL_ZS != IPL_TTY
614 s2 = splzs();
615 #endif
616 zs_modem(zst, 1);
617 rr0 = zs_read_csr(cs);
618 #if IPL_ZS != IPL_TTY
619 splx(s2);
620 #endif
621
622 /* loop, turning on the device, until carrier present */
623 if (ISSET(rr0, ZSRR0_DCD) ||
624 ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR))
625 SET(tp->t_state, TS_CARR_ON);
626 }
627
628 if ((ISSET(tp->t_cflag, CLOCAL) ||
629 ISSET(tp->t_state, TS_CARR_ON)) && !cs->cs_cua)
630 break;
631
632 error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH,
633 ttopen);
634
635 if (!ZSDIALOUT(dev) && cs->cs_cua && error == EINTR) {
636 error = 0;
637 continue;
638 }
639
640 if (error) {
641 if (!ISSET(tp->t_state, TS_ISOPEN)) {
642 #if IPL_ZS != IPL_TTY
643 s2 = splzs();
644 #endif
645 zs_modem(zst, 0);
646 #if IPL_ZS != IPL_TTY
647 splx(s2);
648 #endif
649 CLR(tp->t_state, TS_WOPEN);
650 ttwakeup(tp);
651 }
652 if (ZSDIALOUT(dev))
653 cs->cs_cua = 0;
654 CLR(tp->t_state, TS_WOPEN);
655 break;
656 }
657 if (!ZSDIALOUT(dev) && cs->cs_cua)
658 continue;
659 }
660
661 splx(s);
662
663 if (error == 0)
664 error = ((*linesw[tp->t_line].l_open)(dev, tp, p));
665 if (error)
666 goto bad;
667
668 return (0);
669
670 bad:
671 if (!ISSET(tp->t_state, TS_ISOPEN)) {
672 /*
673 * We failed to open the device, and nobody else had it opened.
674 * Clean up the state as appropriate.
675 */
676 zs_shutdown(zst);
677 }
678
679 return (error);
680 }
681
682 /*
683 * Close a zs serial port.
684 */
685 int
zsclose(dev_t dev,int flags,int mode,struct proc * p)686 zsclose(dev_t dev, int flags, int mode, struct proc *p)
687 {
688 struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(dev));
689 struct zs_chanstate *cs = zst->zst_cs;
690 struct tty *tp = zst->zst_tty;
691 int s;
692
693 /* XXX This is for cons.c. */
694 if (!ISSET(tp->t_state, TS_ISOPEN))
695 return 0;
696
697 (*linesw[tp->t_line].l_close)(tp, flags, p);
698
699 s = spltty();
700 cs->cs_cua = 0;
701 ttyclose(tp);
702 splx(s);
703
704 if (!ISSET(tp->t_state, TS_ISOPEN)) {
705 /*
706 * Although we got a last close, the device may still be in
707 * use; e.g. if this was the dialout node, and there are still
708 * processes waiting for carrier on the non-dialout node.
709 */
710 zs_shutdown(zst);
711 }
712
713 return (0);
714 }
715
716 /*
717 * Read/write zs serial port.
718 */
719 int
zsread(dev_t dev,struct uio * uio,int flags)720 zsread(dev_t dev, struct uio *uio, int flags)
721 {
722 struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(dev));
723 struct tty *tp = zst->zst_tty;
724
725 return (*linesw[tp->t_line].l_read)(tp, uio, flags);
726 }
727
728 int
zswrite(dev_t dev,struct uio * uio,int flags)729 zswrite(dev_t dev, struct uio *uio, int flags)
730 {
731 struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(dev));
732 struct tty *tp = zst->zst_tty;
733
734 return (*linesw[tp->t_line].l_write)(tp, uio, flags);
735 }
736
737 int
zsioctl(dev_t dev,u_long cmd,caddr_t data,int flag,struct proc * p)738 zsioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
739 {
740 struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(dev));
741 struct zs_chanstate *cs = zst->zst_cs;
742 struct tty *tp = zst->zst_tty;
743 int error;
744 int s;
745
746 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
747 if (error >= 0)
748 return (error);
749
750 error = ttioctl(tp, cmd, data, flag, p);
751 if (error >= 0)
752 return (error);
753
754 #ifdef ZS_MD_IOCTL
755 error = ZS_MD_IOCTL;
756 if (error >= 0)
757 return (error);
758 #endif /* ZS_MD_IOCTL */
759
760 error = 0;
761
762 s = splzs();
763
764 switch (cmd) {
765 case TIOCSBRK:
766 zs_break(cs, 1);
767 break;
768
769 case TIOCCBRK:
770 zs_break(cs, 0);
771 break;
772
773 case TIOCGFLAGS:
774 *(int *)data = zst->zst_swflags;
775 break;
776
777 case TIOCSFLAGS:
778 error = suser(p);
779 if (error)
780 break;
781 zst->zst_swflags = *(int *)data;
782 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_NO_DCD))
783 SET(zst->zst_swflags, TIOCFLAG_SOFTCAR);
784 break;
785
786 case TIOCSDTR:
787 zs_modem(zst, 1);
788 break;
789
790 case TIOCCDTR:
791 zs_modem(zst, 0);
792 break;
793
794 case TIOCMSET:
795 case TIOCMBIS:
796 case TIOCMBIC:
797 tiocm_to_zs(zst, cmd, *(int *)data);
798 break;
799
800 case TIOCMGET:
801 *(int *)data = zs_to_tiocm(zst);
802 break;
803
804 default:
805 error = ENOTTY;
806 break;
807 }
808
809 splx(s);
810
811 return (error);
812 }
813
814 /*
815 * Start or restart transmission.
816 */
817 void
zsstart(struct tty * tp)818 zsstart(struct tty *tp)
819 {
820 struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(tp->t_dev));
821 struct zs_chanstate *cs = zst->zst_cs;
822 u_char *tba;
823 int tbc, rr0;
824 int s;
825
826 s = spltty();
827 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP))
828 goto out;
829 if (zst->zst_tx_stopped)
830 goto out;
831
832 ttwakeupwr(tp);
833 if (tp->t_outq.c_cc == 0)
834 goto out;
835
836 /* Grab the first contiguous region of buffer space. */
837 tba = tp->t_outq.c_cf;
838 tbc = ndqb(&tp->t_outq, 0);
839
840 #if IPL_ZS != IPL_TTY
841 (void)splzs();
842 #endif
843
844 zst->zst_tba = tba;
845 zst->zst_tbc = tbc;
846 SET(tp->t_state, TS_BUSY);
847 zst->zst_tx_busy = 1;
848
849 do {
850 rr0 = zs_read_csr(cs);
851 if ((rr0 & ZSRR0_TX_READY) == 0)
852 break;
853
854 zs_write_data(cs, *zst->zst_tba);
855 zst->zst_tbc--;
856 zst->zst_tba++;
857 } while (zst->zst_tbc > 0);
858
859 out:
860 splx(s);
861 }
862
863 /*
864 * Stop output, e.g., for ^S or output flush.
865 */
866 int
zsstop(struct tty * tp,int flag)867 zsstop(struct tty *tp, int flag)
868 {
869 struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(tp->t_dev));
870 int s;
871
872 s = splzs();
873 if (ISSET(tp->t_state, TS_BUSY)) {
874 /* Stop transmitting at the next chunk. */
875 zst->zst_tbc = 0;
876 zst->zst_heldtbc = 0;
877 if (!ISSET(tp->t_state, TS_TTSTOP))
878 SET(tp->t_state, TS_FLUSH);
879 }
880 splx(s);
881 return 0;
882 }
883
884 /*
885 * Set ZS tty parameters from termios.
886 * XXX - Should just copy the whole termios after
887 * making sure all the changes could be done.
888 */
889 int
zsparam(struct tty * tp,struct termios * t)890 zsparam(struct tty *tp, struct termios *t)
891 {
892 struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(tp->t_dev));
893 struct zs_chanstate *cs = zst->zst_cs;
894 int ospeed;
895 tcflag_t cflag;
896 uint8_t tmp3, tmp4, tmp5;
897 int s, error;
898
899 ospeed = t->c_ospeed;
900 cflag = t->c_cflag;
901
902 /* Check requested parameters. */
903 if (ospeed < 0)
904 return (EINVAL);
905 if (t->c_ispeed && t->c_ispeed != ospeed)
906 return (EINVAL);
907
908 /*
909 * For the console, always force CLOCAL and !HUPCL, so that the port
910 * is always active.
911 */
912 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) ||
913 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) {
914 SET(cflag, CLOCAL);
915 CLR(cflag, HUPCL);
916 }
917
918 /*
919 * Only whack the UART when params change.
920 * Some callers need to clear tp->t_ospeed
921 * to make sure initialization gets done.
922 */
923 if (tp->t_ospeed == ospeed &&
924 tp->t_cflag == cflag)
925 return (0);
926
927 /*
928 * Call MD functions to deal with changed
929 * clock modes or H/W flow control modes.
930 * The BRG divisor is set now. (reg 12,13)
931 */
932 error = zs_set_speed(cs, ospeed);
933 if (error)
934 return (error);
935 error = zs_set_modes(cs, cflag);
936 if (error)
937 return (error);
938
939 /*
940 * Block interrupts so that state will not
941 * be altered until we are done setting it up.
942 *
943 * Initial values in cs_preg are set before
944 * our attach routine is called. The master
945 * interrupt enable is handled by zsc.c
946 *
947 */
948 s = splzs();
949
950 /*
951 * Recalculate which status ints to enable.
952 */
953 zs_maskintr(zst);
954
955 /* Recompute character size bits. */
956 tmp3 = cs->cs_preg[3];
957 tmp5 = cs->cs_preg[5];
958 CLR(tmp3, ZSWR3_RXSIZE);
959 CLR(tmp5, ZSWR5_TXSIZE);
960 switch (ISSET(cflag, CSIZE)) {
961 case CS5:
962 SET(tmp3, ZSWR3_RX_5);
963 SET(tmp5, ZSWR5_TX_5);
964 break;
965 case CS6:
966 SET(tmp3, ZSWR3_RX_6);
967 SET(tmp5, ZSWR5_TX_6);
968 break;
969 case CS7:
970 SET(tmp3, ZSWR3_RX_7);
971 SET(tmp5, ZSWR5_TX_7);
972 break;
973 case CS8:
974 SET(tmp3, ZSWR3_RX_8);
975 SET(tmp5, ZSWR5_TX_8);
976 break;
977 }
978 cs->cs_preg[3] = tmp3;
979 cs->cs_preg[5] = tmp5;
980
981 /*
982 * Recompute the stop bits and parity bits. Note that
983 * zs_set_speed() may have set clock selection bits etc.
984 * in wr4, so those must preserved.
985 */
986 tmp4 = cs->cs_preg[4];
987 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK);
988 if (ISSET(cflag, CSTOPB))
989 SET(tmp4, ZSWR4_TWOSB);
990 else
991 SET(tmp4, ZSWR4_ONESB);
992 if (!ISSET(cflag, PARODD))
993 SET(tmp4, ZSWR4_EVENP);
994 if (ISSET(cflag, PARENB))
995 SET(tmp4, ZSWR4_PARENB);
996 cs->cs_preg[4] = tmp4;
997
998 /* And copy to tty. */
999 tp->t_ispeed = 0;
1000 tp->t_ospeed = ospeed;
1001 tp->t_cflag = cflag;
1002
1003 /*
1004 * If nothing is being transmitted, set up new current values,
1005 * else mark them as pending.
1006 */
1007 if (!cs->cs_heldchange) {
1008 if (zst->zst_tx_busy) {
1009 zst->zst_heldtbc = zst->zst_tbc;
1010 zst->zst_tbc = 0;
1011 cs->cs_heldchange = 1;
1012 } else
1013 zs_loadchannelregs(cs);
1014 }
1015
1016 /*
1017 * If hardware flow control is disabled, turn off the buffer water
1018 * marks and unblock any soft flow control state. Otherwise, enable
1019 * the water marks.
1020 */
1021 if (!ISSET(cflag, CHWFLOW)) {
1022 zst->zst_r_hiwat = 0;
1023 zst->zst_r_lowat = 0;
1024 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) {
1025 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED);
1026 zst->zst_rx_ready = 1;
1027 cs->cs_softreq = 1;
1028 }
1029 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) {
1030 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED);
1031 zs_hwiflow(zst);
1032 }
1033 } else {
1034 zst->zst_r_hiwat = zstty_rbuf_hiwat;
1035 zst->zst_r_lowat = zstty_rbuf_lowat;
1036 }
1037
1038 /*
1039 * Force a recheck of the hardware carrier and flow control status,
1040 * since we may have changed which bits we're looking at.
1041 */
1042 zstty_stint(cs, 1);
1043
1044 splx(s);
1045
1046 /*
1047 * If hardware flow control is disabled, unblock any hard flow control
1048 * state.
1049 */
1050 if (!ISSET(cflag, CHWFLOW)) {
1051 if (zst->zst_tx_stopped) {
1052 zst->zst_tx_stopped = 0;
1053 zsstart(tp);
1054 }
1055 }
1056
1057 zstty_softint(cs);
1058
1059 return (0);
1060 }
1061
1062 /*
1063 * Compute interrupt enable bits and set in the pending bits. Called both
1064 * in zsparam() and when PPS (pulse per second timing) state changes.
1065 * Must be called at splzs().
1066 */
1067 void
zs_maskintr(struct zstty_softc * zst)1068 zs_maskintr(struct zstty_softc *zst)
1069 {
1070 struct zs_chanstate *cs = zst->zst_cs;
1071 uint8_t tmp15;
1072
1073 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd;
1074 if (zst->zst_ppsmask != 0)
1075 cs->cs_rr0_mask |= cs->cs_rr0_pps;
1076 tmp15 = cs->cs_preg[15];
1077 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD))
1078 SET(tmp15, ZSWR15_DCD_IE);
1079 else
1080 CLR(tmp15, ZSWR15_DCD_IE);
1081 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS))
1082 SET(tmp15, ZSWR15_CTS_IE);
1083 else
1084 CLR(tmp15, ZSWR15_CTS_IE);
1085 cs->cs_preg[15] = tmp15;
1086 }
1087
1088
1089 /*
1090 * Raise or lower modem control (DTR/RTS) signals. If a character is
1091 * in transmission, the change is deferred.
1092 * Called at splzs().
1093 */
1094 void
zs_modem(struct zstty_softc * zst,int onoff)1095 zs_modem(struct zstty_softc *zst, int onoff)
1096 {
1097 struct zs_chanstate *cs = zst->zst_cs, *ccs;
1098
1099 if (cs->cs_wr5_dtr == 0)
1100 return;
1101
1102 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs);
1103
1104 if (onoff)
1105 SET(ccs->cs_preg[5], cs->cs_wr5_dtr);
1106 else
1107 CLR(ccs->cs_preg[5], cs->cs_wr5_dtr);
1108
1109 if (!cs->cs_heldchange) {
1110 if (zst->zst_tx_busy) {
1111 zst->zst_heldtbc = zst->zst_tbc;
1112 zst->zst_tbc = 0;
1113 cs->cs_heldchange = 1;
1114 } else
1115 zs_loadchannelregs(cs);
1116 }
1117 }
1118
1119 /*
1120 * Set modem bits.
1121 * Called at splzs().
1122 */
1123 void
tiocm_to_zs(struct zstty_softc * zst,u_long how,int ttybits)1124 tiocm_to_zs(struct zstty_softc *zst, u_long how, int ttybits)
1125 {
1126 struct zs_chanstate *cs = zst->zst_cs, *ccs;
1127 uint8_t zsbits;
1128
1129 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs);
1130
1131 zsbits = 0;
1132 if (ISSET(ttybits, TIOCM_DTR))
1133 SET(zsbits, ZSWR5_DTR);
1134 if (ISSET(ttybits, TIOCM_RTS))
1135 SET(zsbits, ZSWR5_RTS);
1136
1137 switch (how) {
1138 case TIOCMBIC:
1139 CLR(ccs->cs_preg[5], zsbits);
1140 break;
1141
1142 case TIOCMBIS:
1143 SET(ccs->cs_preg[5], zsbits);
1144 break;
1145
1146 case TIOCMSET:
1147 CLR(ccs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR);
1148 SET(ccs->cs_preg[5], zsbits);
1149 break;
1150 }
1151
1152 if (!cs->cs_heldchange) {
1153 if (zst->zst_tx_busy) {
1154 zst->zst_heldtbc = zst->zst_tbc;
1155 zst->zst_tbc = 0;
1156 cs->cs_heldchange = 1;
1157 } else
1158 zs_loadchannelregs(cs);
1159 }
1160 }
1161
1162 /*
1163 * Get modem bits.
1164 * Called at splzs().
1165 */
1166 int
zs_to_tiocm(struct zstty_softc * zst)1167 zs_to_tiocm(struct zstty_softc *zst)
1168 {
1169 struct zs_chanstate *cs = zst->zst_cs, *ccs;
1170 uint8_t zsbits;
1171 int ttybits = 0;
1172
1173 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs);
1174
1175 zsbits = ccs->cs_preg[5];
1176 if (ISSET(zsbits, ZSWR5_DTR))
1177 SET(ttybits, TIOCM_DTR);
1178 if (ISSET(zsbits, ZSWR5_RTS))
1179 SET(ttybits, TIOCM_RTS);
1180
1181 zsbits = cs->cs_rr0;
1182 if (ISSET(zsbits, ZSRR0_DCD))
1183 SET(ttybits, TIOCM_CD);
1184 if (ISSET(zsbits, ZSRR0_CTS))
1185 SET(ttybits, TIOCM_CTS);
1186
1187 return (ttybits);
1188 }
1189
1190 /*
1191 * Try to block or unblock input using hardware flow-control.
1192 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and
1193 * if this function returns non-zero, the TS_TBLOCK flag will
1194 * be set or cleared according to the "block" arg passed.
1195 */
1196 int
zshwiflow(struct tty * tp,int block)1197 zshwiflow(struct tty *tp, int block)
1198 {
1199 struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(tp->t_dev));
1200 struct zs_chanstate *cs = zst->zst_cs;
1201 int s;
1202
1203 if (cs->cs_wr5_rts == 0)
1204 return (0);
1205
1206 s = splzs();
1207 if (block) {
1208 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) {
1209 SET(zst->zst_rx_flags, RX_TTY_BLOCKED);
1210 zs_hwiflow(zst);
1211 }
1212 } else {
1213 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) {
1214 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED);
1215 zst->zst_rx_ready = 1;
1216 cs->cs_softreq = 1;
1217 }
1218 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) {
1219 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED);
1220 zs_hwiflow(zst);
1221 }
1222 }
1223 splx(s);
1224 return (1);
1225 }
1226
1227 /*
1228 * Internal version of zshwiflow
1229 * Called at splzs()
1230 */
1231 void
zs_hwiflow(struct zstty_softc * zst)1232 zs_hwiflow(struct zstty_softc *zst)
1233 {
1234 struct zs_chanstate *cs = zst->zst_cs, *ccs;
1235
1236 if (cs->cs_wr5_rts == 0)
1237 return;
1238
1239 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs);
1240
1241 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) {
1242 CLR(ccs->cs_preg[5], cs->cs_wr5_rts);
1243 CLR(ccs->cs_creg[5], cs->cs_wr5_rts);
1244 } else {
1245 SET(ccs->cs_preg[5], cs->cs_wr5_rts);
1246 SET(ccs->cs_creg[5], cs->cs_wr5_rts);
1247 }
1248 zs_write_reg(ccs, 5, ccs->cs_creg[5]);
1249 }
1250
1251
1252 /****************************************************************
1253 * Interface to the lower layer (zscc)
1254 ****************************************************************/
1255
1256 void zstty_rxsoft(struct zstty_softc *, struct tty *);
1257 void zstty_txsoft(struct zstty_softc *, struct tty *);
1258 void zstty_stsoft(struct zstty_softc *, struct tty *);
1259 void zstty_diag(void *);
1260
1261 /*
1262 * Receiver Ready interrupt.
1263 * Called at splzs().
1264 */
1265 void
zstty_rxint(struct zs_chanstate * cs)1266 zstty_rxint(struct zs_chanstate *cs)
1267 {
1268 struct zstty_softc *zst = cs->cs_private;
1269 uint8_t *put, *end;
1270 u_int cc;
1271 uint8_t rr0, rr1, c;
1272
1273 end = zst->zst_ebuf;
1274 put = zst->zst_rbput;
1275 cc = zst->zst_rbavail;
1276
1277 while (cc > 0) {
1278 /*
1279 * First read the status, because reading the received char
1280 * destroys the status of this char.
1281 */
1282 rr1 = zs_read_reg(cs, 1);
1283 c = zs_read_data(cs);
1284
1285 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) {
1286 /* Clear the receive error. */
1287 zs_write_csr(cs, ZSWR0_RESET_ERRORS);
1288 }
1289
1290 put[0] = c;
1291 put[1] = rr1;
1292 put += 2;
1293 if (put >= end)
1294 put = zst->zst_rbuf;
1295 cc--;
1296
1297 rr0 = zs_read_csr(cs);
1298 if (!ISSET(rr0, ZSRR0_RX_READY))
1299 break;
1300 }
1301
1302 /*
1303 * Current string of incoming characters ended because
1304 * no more data was available or we ran out of space.
1305 * Schedule a receive event if any data was received.
1306 * If we're out of space, turn off receive interrupts.
1307 */
1308 zst->zst_rbput = put;
1309 zst->zst_rbavail = cc;
1310 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) {
1311 zst->zst_rx_ready = 1;
1312 cs->cs_softreq = 1;
1313 }
1314
1315 /*
1316 * See if we are in danger of overflowing a buffer. If
1317 * so, use hardware flow control to ease the pressure.
1318 */
1319 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) &&
1320 cc < zst->zst_r_hiwat) {
1321 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED);
1322 zs_hwiflow(zst);
1323 }
1324
1325 /*
1326 * If we're out of space, disable receive interrupts
1327 * until the queue has drained a bit.
1328 */
1329 if (!cc) {
1330 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED);
1331 CLR(cs->cs_preg[1], ZSWR1_RIE);
1332 cs->cs_creg[1] = cs->cs_preg[1];
1333 zs_write_reg(cs, 1, cs->cs_creg[1]);
1334 }
1335 }
1336
1337 /*
1338 * Transmitter Ready interrupt.
1339 * Called at splzs().
1340 */
1341 void
zstty_txint(struct zs_chanstate * cs)1342 zstty_txint(struct zs_chanstate *cs)
1343 {
1344 struct zstty_softc *zst = cs->cs_private;
1345 int rr0;
1346
1347 zs_write_csr(cs, ZSWR0_RESET_TXINT);
1348
1349 /*
1350 * If we've delayed a parameter change, do it now, and restart
1351 * output.
1352 */
1353 if (cs->cs_heldchange) {
1354 zs_loadchannelregs(cs);
1355 cs->cs_heldchange = 0;
1356 zst->zst_tbc = zst->zst_heldtbc;
1357 zst->zst_heldtbc = 0;
1358 }
1359
1360 while (zst->zst_tbc > 0) {
1361 rr0 = zs_read_csr(cs);
1362 if ((rr0 & ZSRR0_TX_READY) == 0)
1363 break;
1364
1365 zs_write_data(cs, *zst->zst_tba);
1366 zst->zst_tbc--;
1367 zst->zst_tba++;
1368 }
1369
1370 if (zst->zst_tbc == 0) {
1371 if (zst->zst_tx_busy) {
1372 zst->zst_tx_busy = 0;
1373 zst->zst_tx_done = 1;
1374 cs->cs_softreq = 1;
1375 }
1376 }
1377 }
1378
1379 #ifdef DDB
1380 #include <ddb/db_var.h>
1381 #define DB_CONSOLE db_console
1382 #else
1383 #define DB_CONSOLE 0
1384 #endif
1385
1386 /*
1387 * Status Change interrupt.
1388 * Called at splzs().
1389 */
1390 void
zstty_stint(struct zs_chanstate * cs,int force)1391 zstty_stint(struct zs_chanstate *cs, int force)
1392 {
1393 struct zstty_softc *zst = cs->cs_private;
1394 struct tty *tp = zst->zst_tty;
1395 uint8_t rr0, delta;
1396
1397 rr0 = zs_read_csr(cs);
1398 zs_write_csr(cs, ZSWR0_RESET_STATUS);
1399
1400 /*
1401 * Check here for console break, so that we can abort
1402 * even when interrupts are locking up the machine.
1403 */
1404 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) &&
1405 ISSET(rr0, ZSRR0_BREAK) && DB_CONSOLE)
1406 zs_abort(cs);
1407
1408 if (!force)
1409 delta = rr0 ^ cs->cs_rr0;
1410 else
1411 delta = cs->cs_rr0_mask;
1412
1413 ttytstamp(tp, cs->cs_rr0 & ZSRR0_CTS, rr0 & ZSRR0_CTS,
1414 cs->cs_rr0 & ZSRR0_DCD, rr0 & ZSRR0_DCD);
1415
1416 cs->cs_rr0 = rr0;
1417
1418 if (ISSET(delta, cs->cs_rr0_mask)) {
1419 SET(cs->cs_rr0_delta, delta);
1420
1421 /*
1422 * Stop output immediately if we lose the output
1423 * flow control signal or carrier detect.
1424 */
1425 if (ISSET(~rr0, cs->cs_rr0_mask)) {
1426 zst->zst_tbc = 0;
1427 zst->zst_heldtbc = 0;
1428 }
1429
1430 zst->zst_st_check = 1;
1431 cs->cs_softreq = 1;
1432 }
1433 }
1434
1435 void
zstty_diag(void * arg)1436 zstty_diag(void *arg)
1437 {
1438 struct zstty_softc *zst = arg;
1439 int overflows, floods;
1440 int s;
1441
1442 s = splzs();
1443 overflows = zst->zst_overflows;
1444 zst->zst_overflows = 0;
1445 floods = zst->zst_floods;
1446 zst->zst_floods = 0;
1447 zst->zst_errors = 0;
1448 splx(s);
1449
1450 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n",
1451 zst->zst_dev.dv_xname,
1452 overflows, overflows == 1 ? "" : "s",
1453 floods, floods == 1 ? "" : "s");
1454 }
1455
1456 void
zstty_rxsoft(struct zstty_softc * zst,struct tty * tp)1457 zstty_rxsoft(struct zstty_softc *zst, struct tty *tp)
1458 {
1459 struct zs_chanstate *cs = zst->zst_cs;
1460 int (*rint)(int, struct tty *) = linesw[tp->t_line].l_rint;
1461 uint8_t *get, *end;
1462 u_int cc, scc;
1463 uint8_t rr1;
1464 int code;
1465 int s;
1466
1467 end = zst->zst_ebuf;
1468 get = zst->zst_rbget;
1469 scc = cc = zstty_rbuf_size - zst->zst_rbavail;
1470
1471 if (cc == zstty_rbuf_size) {
1472 zst->zst_floods++;
1473 if (zst->zst_errors++ == 0)
1474 timeout_add_sec(&zst->zst_diag_ch, 60);
1475 }
1476
1477 /* If not yet open, drop the entire buffer content here */
1478 if (!ISSET(tp->t_state, TS_ISOPEN)) {
1479 get += cc << 1;
1480 if (get >= end)
1481 get -= zstty_rbuf_size << 1;
1482 cc = 0;
1483 }
1484 while (cc) {
1485 code = get[0];
1486 rr1 = get[1];
1487 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) {
1488 if (ISSET(rr1, ZSRR1_DO)) {
1489 zst->zst_overflows++;
1490 if (zst->zst_errors++ == 0)
1491 timeout_add_sec(&zst->zst_diag_ch, 60);
1492 }
1493 if (ISSET(rr1, ZSRR1_FE))
1494 SET(code, TTY_FE);
1495 if (ISSET(rr1, ZSRR1_PE))
1496 SET(code, TTY_PE);
1497 }
1498 if ((*rint)(code, tp) == -1) {
1499 /*
1500 * The line discipline's buffer is out of space.
1501 */
1502 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) {
1503 /*
1504 * We're either not using flow control, or the
1505 * line discipline didn't tell us to block for
1506 * some reason. Either way, we have no way to
1507 * know when there's more space available, so
1508 * just drop the rest of the data.
1509 */
1510 get += cc << 1;
1511 if (get >= end)
1512 get -= zstty_rbuf_size << 1;
1513 cc = 0;
1514 } else {
1515 /*
1516 * Don't schedule any more receive processing
1517 * until the line discipline tells us there's
1518 * space available (through comhwiflow()).
1519 * Leave the rest of the data in the input
1520 * buffer.
1521 */
1522 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED);
1523 }
1524 break;
1525 }
1526 get += 2;
1527 if (get >= end)
1528 get = zst->zst_rbuf;
1529 cc--;
1530 }
1531
1532 if (cc != scc) {
1533 zst->zst_rbget = get;
1534 s = splzs();
1535 cc = zst->zst_rbavail += scc - cc;
1536 /* Buffers should be ok again, release possible block. */
1537 if (cc >= zst->zst_r_lowat) {
1538 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) {
1539 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED);
1540 SET(cs->cs_preg[1], ZSWR1_RIE);
1541 cs->cs_creg[1] = cs->cs_preg[1];
1542 zs_write_reg(cs, 1, cs->cs_creg[1]);
1543 }
1544 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) {
1545 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED);
1546 zs_hwiflow(zst);
1547 }
1548 }
1549 splx(s);
1550 }
1551 }
1552
1553 void
zstty_txsoft(struct zstty_softc * zst,struct tty * tp)1554 zstty_txsoft(struct zstty_softc *zst, struct tty *tp)
1555 {
1556 int s;
1557
1558 CLR(tp->t_state, TS_BUSY);
1559 if (ISSET(tp->t_state, TS_FLUSH))
1560 CLR(tp->t_state, TS_FLUSH);
1561 else {
1562 s = splzs();
1563 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf));
1564 splx(s);
1565 }
1566 (*linesw[tp->t_line].l_start)(tp);
1567 }
1568
1569 void
zstty_stsoft(struct zstty_softc * zst,struct tty * tp)1570 zstty_stsoft(struct zstty_softc *zst, struct tty *tp)
1571 {
1572 struct zs_chanstate *cs = zst->zst_cs;
1573 uint8_t rr0, delta;
1574 int s;
1575
1576 s = splzs();
1577 rr0 = cs->cs_rr0;
1578 delta = cs->cs_rr0_delta;
1579 cs->cs_rr0_delta = 0;
1580 splx(s);
1581
1582 if (ISSET(delta, cs->cs_rr0_dcd)) {
1583 /*
1584 * Inform the tty layer that carrier detect changed.
1585 */
1586 (void)(*linesw[tp->t_line].l_modem)(tp, ISSET(rr0, ZSRR0_DCD));
1587 }
1588
1589 if (ISSET(delta, cs->cs_rr0_cts)) {
1590 /* Block or unblock output according to flow control. */
1591 if (ISSET(rr0, cs->cs_rr0_cts)) {
1592 zst->zst_tx_stopped = 0;
1593 (*linesw[tp->t_line].l_start)(tp);
1594 } else {
1595 zst->zst_tx_stopped = 1;
1596 }
1597 }
1598 }
1599
1600 /*
1601 * Software interrupt. Called at zssoft
1602 *
1603 * The main job to be done here is to empty the input ring
1604 * by passing its contents up to the tty layer. The ring is
1605 * always emptied during this operation, therefore the ring
1606 * must not be larger than the space after "high water" in
1607 * the tty layer, or the tty layer might drop our input.
1608 *
1609 * Note: an "input blockage" condition is assumed to exist if
1610 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set.
1611 */
1612 void
zstty_softint(struct zs_chanstate * cs)1613 zstty_softint(struct zs_chanstate *cs)
1614 {
1615 struct zstty_softc *zst = cs->cs_private;
1616 struct tty *tp = zst->zst_tty;
1617 int s;
1618
1619 s = spltty();
1620
1621 if (zst->zst_rx_ready) {
1622 zst->zst_rx_ready = 0;
1623 zstty_rxsoft(zst, tp);
1624 }
1625
1626 if (zst->zst_st_check) {
1627 zst->zst_st_check = 0;
1628 zstty_stsoft(zst, tp);
1629 }
1630
1631 if (zst->zst_tx_done) {
1632 zst->zst_tx_done = 0;
1633 zstty_txsoft(zst, tp);
1634 }
1635
1636 splx(s);
1637 }
1638
1639 struct zsops zsops_tty = {
1640 zstty_rxint, /* receive char available */
1641 zstty_stint, /* external/status */
1642 zstty_txint, /* xmit buffer empty */
1643 zstty_softint, /* process software interrupt */
1644 };
1645