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1.1 nbrk 1: /* $OpenBSD: z8530tty.c,v 1.8 2007/05/25 21:27:15 krw Exp $ */
2: /* $NetBSD: z8530tty.c,v 1.13 1996/10/16 20:42:14 gwr 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/file.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 <sparc/dev/z8530reg.h>
112: #include <machine/z8530var.h>
113:
114: #include <dev/cons.h>
115:
116: #ifdef KGDB
117: extern int zs_check_kgdb(struct zs_chanstate *, int);
118: #endif
119:
120: /*
121: * Allow the MD var.h to override the default CFLAG so that
122: * console messages during boot come out with correct parity.
123: */
124: #ifndef ZSTTY_DEF_CFLAG
125: #define ZSTTY_DEF_CFLAG TTYDEF_CFLAG
126: #endif
127:
128: /*
129: * How many input characters we can buffer.
130: * The port-specific var.h may override this.
131: * Note: must be a power of two!
132: */
133: #ifndef ZSTTY_RING_SIZE
134: #define ZSTTY_RING_SIZE 2048
135: #endif
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: u_char *volatile zst_rbget,
164: *volatile zst_rbput;
165: volatile u_int zst_rbavail;
166: u_char *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: u_char *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 u_char 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: u_char zst_ppsmask; /* pps signal mask */
194: u_char zst_ppsassert; /* pps leading edge */
195: u_char zst_ppsclear; /* pps trailing edge */
196: };
197:
198:
199: /* Definition of the driver for autoconfig. */
200: int zstty_match(struct device *, void *, void *);
201: void zstty_attach(struct device *, struct device *, void *);
202:
203: struct cfattach zstty_ca = {
204: sizeof(struct zstty_softc), zstty_match, zstty_attach
205: };
206:
207: struct cfdriver zstty_cd = {
208: NULL, "zstty", DV_TTY
209: };
210:
211: struct zsops zsops_tty;
212:
213: /* Routines called from other code. */
214: cdev_decl(zs); /* open, close, read, write, ioctl, stop, ... */
215:
216: void zs_shutdown(struct zstty_softc *);
217: void zsstart(struct tty *);
218: int zsparam(struct tty *, struct termios *);
219: void zs_modem(struct zstty_softc *, int);
220: void tiocm_to_zs(struct zstty_softc *, u_long, int);
221: int zs_to_tiocm(struct zstty_softc *);
222: int zshwiflow(struct tty *, int);
223: void zs_hwiflow(struct zstty_softc *);
224: void zs_maskintr(struct zstty_softc *);
225:
226: /* Low-level routines. */
227: void zstty_rxint(struct zs_chanstate *);
228: void zstty_stint(struct zs_chanstate *, int);
229: void zstty_txint(struct zs_chanstate *);
230: void zstty_softint(struct zs_chanstate *);
231: void zstty_diag(void *);
232:
233: #define ZSUNIT(x) (minor(x) & 0x7ffff)
234: #define ZSDIALOUT(x) (minor(x) & 0x80000)
235:
236: /*
237: * zstty_match: how is this zs channel configured?
238: */
239: int
240: zstty_match(parent, match, aux)
241: struct device *parent;
242: void *match, *aux;
243: {
244: struct cfdata *cf = match;
245: struct zsc_attach_args *args = aux;
246:
247: /* Exact match is better than wildcard. */
248: if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel)
249: return 2;
250:
251: /* This driver accepts wildcard. */
252: if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT)
253: return 1;
254:
255: return 0;
256: }
257:
258: void
259: zstty_attach(parent, self, aux)
260: struct device *parent, *self;
261: void *aux;
262:
263: {
264: struct zsc_softc *zsc = (void *) parent;
265: struct zstty_softc *zst = (void *) self;
266: struct zsc_attach_args *args = aux;
267: struct zs_chanstate *cs;
268: struct cfdata *cf;
269: struct tty *tp;
270: int channel, s, tty_unit;
271: dev_t dev;
272: char *i, *o;
273:
274: cf = zst->zst_dev.dv_cfdata;
275:
276: timeout_set(&zst->zst_diag_ch, zstty_diag, zst);
277:
278: tty_unit = zst->zst_dev.dv_unit;
279: channel = args->channel;
280: cs = &zsc->zsc_cs[channel];
281: cs->cs_private = zst;
282: cs->cs_ops = &zsops_tty;
283:
284: zst->zst_cs = cs;
285: zst->zst_swflags = cf->cf_flags; /* softcar, etc. */
286: zst->zst_hwflags = args->hwflags;
287: dev = makedev(zs_major, tty_unit);
288:
289: if (zst->zst_swflags)
290: printf(" flags 0x%x", zst->zst_swflags);
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: /* Set console magic to BREAK */
307: }
308: if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_OUTPUT) != 0) {
309: o = "output";
310: if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) {
311: cn_tab->cn_putc = args->consdev->cn_putc;
312: }
313: cn_tab->cn_dev = dev;
314: }
315: if (i != NULL || o != NULL)
316: printf(" (console %s)", i ? (o ? "i/o" : i) : o);
317:
318: #ifdef KGDB
319: /*
320: * Allow kgdb to "take over" this port. If this port is
321: * NOT the kgdb port, zs_check_kgdb() will return zero.
322: * If it IS the kgdb port, it will print "kgdb,...\n"
323: * and then return non-zero.
324: */
325: if (zs_check_kgdb(cs, dev)) {
326: printf(" (kgdb)\n");
327: /*
328: * This is the kgdb port (exclusive use)
329: * so skip the normal attach code.
330: */
331: return;
332: }
333: #endif
334:
335: if (strcmp(args->type, "keyboard") == 0 ||
336: strcmp(args->type, "mouse") == 0)
337: printf(": %s", args->type);
338:
339: printf("\n");
340:
341: tp = ttymalloc();
342: tp->t_dev = dev;
343: tp->t_oproc = zsstart;
344: tp->t_param = zsparam;
345: tp->t_hwiflow = zshwiflow;
346:
347: zst->zst_tty = tp;
348: zst->zst_rbuf = malloc(zstty_rbuf_size << 1, M_DEVBUF, M_WAITOK);
349: zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1);
350: /* Disable the high water mark. */
351: zst->zst_r_hiwat = 0;
352: zst->zst_r_lowat = 0;
353: zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf;
354: zst->zst_rbavail = zstty_rbuf_size;
355:
356: /* if there are no enable/disable functions, assume the device
357: is always enabled */
358: if (!cs->enable)
359: cs->enabled = 1;
360:
361: /*
362: * Hardware init
363: */
364: if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) {
365: /* Call zsparam similar to open. */
366: struct termios t;
367:
368: /* Wait a while for previous console output to complete */
369: DELAY(10000);
370:
371: /* Setup the "new" parameters in t. */
372: t.c_ispeed = 0;
373: t.c_ospeed = cs->cs_defspeed;
374: t.c_cflag = cs->cs_defcflag;
375:
376: s = splzs();
377:
378: /*
379: * Turn on receiver and status interrupts.
380: * We defer the actual write of the register to zsparam(),
381: * but we must make sure status interrupts are turned on by
382: * the time zsparam() reads the initial rr0 state.
383: */
384: SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE);
385:
386: splx(s);
387:
388: /* Make sure zsparam will see changes. */
389: tp->t_ospeed = 0;
390: (void) zsparam(tp, &t);
391:
392: s = splzs();
393:
394: /* Make sure DTR is on now. */
395: zs_modem(zst, 1);
396:
397: splx(s);
398: } else if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_NORESET)) {
399: /* Not the console; may need reset. */
400: int reset;
401:
402: reset = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET;
403:
404: s = splzs();
405:
406: zs_write_reg(cs, 9, reset);
407:
408: /* Will raise DTR in open. */
409: zs_modem(zst, 0);
410:
411: splx(s);
412: }
413: }
414:
415:
416: /*
417: * Return pointer to our tty.
418: */
419: struct tty *
420: zstty(dev)
421: dev_t dev;
422: {
423: struct zstty_softc *zst;
424: int unit = minor(dev);
425:
426: #ifdef DIAGNOSTIC
427: if (unit >= zstty_cd.cd_ndevs)
428: panic("zstty");
429: #endif
430: zst = zstty_cd.cd_devs[unit];
431: return (zst->zst_tty);
432: }
433:
434:
435: void
436: zs_shutdown(zst)
437: struct zstty_softc *zst;
438: {
439: struct zs_chanstate *cs = zst->zst_cs;
440: struct tty *tp = zst->zst_tty;
441: int s;
442:
443: s = splzs();
444:
445: /* If we were asserting flow control, then deassert it. */
446: SET(zst->zst_rx_flags, RX_IBUF_BLOCKED);
447: zs_hwiflow(zst);
448:
449: /* Clear any break condition set with TIOCSBRK. */
450: zs_break(cs, 0);
451:
452: /* Turn off PPS capture on last close. */
453: zst->zst_ppsmask = 0;
454:
455: /*
456: * Hang up if necessary. Wait a bit, so the other side has time to
457: * notice even if we immediately open the port again.
458: */
459: if (ISSET(tp->t_cflag, HUPCL)) {
460: zs_modem(zst, 0);
461: (void) tsleep(cs, TTIPRI, ttclos, hz);
462: }
463:
464: /* Turn off interrupts if not the console. */
465: if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) {
466: CLR(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE);
467: cs->cs_creg[1] = cs->cs_preg[1];
468: zs_write_reg(cs, 1, cs->cs_creg[1]);
469: }
470:
471: /* Call the power management hook. */
472: if (cs->disable) {
473: #ifdef DIAGNOSTIC
474: if (!cs->enabled)
475: panic("zs_shutdown: not enabled?");
476: #endif
477: (*cs->disable)(zst->zst_cs);
478: }
479:
480: splx(s);
481: }
482:
483: /*
484: * Open a zs serial (tty) port.
485: */
486: int
487: zsopen(dev, flags, mode, p)
488: dev_t dev;
489: int flags;
490: int mode;
491: struct proc *p;
492: {
493: register struct tty *tp;
494: register struct zs_chanstate *cs;
495: struct zstty_softc *zst;
496: int s, s2;
497: int error, unit;
498:
499: unit = minor(dev);
500: if (unit >= zstty_cd.cd_ndevs)
501: return (ENXIO);
502: zst = zstty_cd.cd_devs[unit];
503: if (zst == NULL)
504: return (ENXIO);
505: tp = zst->zst_tty;
506: cs = zst->zst_cs;
507:
508: /* If KGDB took the line, then tp==NULL */
509: if (tp == NULL)
510: return (EBUSY);
511:
512: if (ISSET(tp->t_state, TS_ISOPEN) &&
513: ISSET(tp->t_state, TS_XCLUDE) &&
514: p->p_ucred->cr_uid != 0)
515: return (EBUSY);
516:
517: s = spltty();
518:
519: /*
520: * Do the following iff this is a first open.
521: */
522: if (!ISSET(tp->t_state, TS_ISOPEN)) {
523: struct termios t;
524:
525: tp->t_dev = dev;
526:
527: /* Call the power management hook. */
528: if (cs->enable) {
529: if ((*cs->enable)(cs)) {
530: splx(s);
531: printf("%s: device enable failed\n",
532: zst->zst_dev.dv_xname);
533: return (EIO);
534: }
535: }
536:
537: /*
538: * Initialize the termios status to the defaults. Add in the
539: * sticky bits from TIOCSFLAGS.
540: */
541: t.c_ispeed = 0;
542: t.c_ospeed = cs->cs_defspeed;
543: t.c_cflag = cs->cs_defcflag;
544: if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL))
545: SET(t.c_cflag, CLOCAL);
546: if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS))
547: SET(t.c_cflag, CRTSCTS);
548: if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF))
549: SET(t.c_cflag, MDMBUF);
550:
551: s2 = splzs();
552:
553: /*
554: * Turn on receiver and status interrupts.
555: * We defer the actual write of the register to zsparam(),
556: * but we must make sure status interrupts are turned on by
557: * the time zsparam() reads the initial rr0 state.
558: */
559: SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE);
560:
561: /* Clear PPS capture state on first open. */
562: zst->zst_ppsmask = 0;
563:
564: splx(s2);
565:
566: /* Make sure zsparam will see changes. */
567: tp->t_ospeed = 0;
568: (void) zsparam(tp, &t);
569:
570: /*
571: * Note: zsparam has done: cflag, ispeed, ospeed
572: * so we just need to do: iflag, oflag, lflag, cc
573: * For "raw" mode, just leave all zeros.
574: */
575: if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) {
576: tp->t_iflag = TTYDEF_IFLAG;
577: tp->t_oflag = TTYDEF_OFLAG;
578: tp->t_lflag = TTYDEF_LFLAG;
579: } else {
580: tp->t_iflag = 0;
581: tp->t_oflag = 0;
582: tp->t_lflag = 0;
583: }
584: ttychars(tp);
585: ttsetwater(tp);
586:
587: s2 = splzs();
588:
589: /*
590: * Turn on DTR. We must always do this, even if carrier is not
591: * present, because otherwise we'd have to use TIOCSDTR
592: * immediately after setting CLOCAL, which applications do not
593: * expect. We always assert DTR while the device is open
594: * unless explicitly requested to deassert it.
595: */
596: zs_modem(zst, 1);
597:
598: /* Clear the input ring, and unblock. */
599: zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf;
600: zst->zst_rbavail = zstty_rbuf_size;
601: zs_iflush(cs);
602: CLR(zst->zst_rx_flags, RX_ANY_BLOCK);
603: zs_hwiflow(zst);
604:
605: splx(s2);
606: }
607:
608: splx(s);
609:
610: error = ((*linesw[tp->t_line].l_open)(dev, tp));
611: if (error)
612: goto bad;
613:
614: return (0);
615:
616: bad:
617: if (!ISSET(tp->t_state, TS_ISOPEN)) {
618: /*
619: * We failed to open the device, and nobody else had it opened.
620: * Clean up the state as appropriate.
621: */
622: zs_shutdown(zst);
623: }
624:
625: return (error);
626: }
627:
628: /*
629: * Close a zs serial port.
630: */
631: int
632: zsclose(dev, flags, mode, p)
633: dev_t dev;
634: int flags;
635: int mode;
636: struct proc *p;
637: {
638: struct zstty_softc *zst;
639: register struct zs_chanstate *cs;
640: register struct tty *tp;
641:
642: zst = zstty_cd.cd_devs[minor(dev)];
643: cs = zst->zst_cs;
644: tp = zst->zst_tty;
645:
646: /* XXX This is for cons.c. */
647: if (!ISSET(tp->t_state, TS_ISOPEN))
648: return 0;
649:
650: (*linesw[tp->t_line].l_close)(tp, flags);
651: ttyclose(tp);
652:
653: if (!ISSET(tp->t_state, TS_ISOPEN)) {
654: /*
655: * Although we got a last close, the device may still be in
656: * use; e.g. if this was the dialout node, and there are still
657: * processes waiting for carrier on the non-dialout node.
658: */
659: zs_shutdown(zst);
660: }
661:
662: return (0);
663: }
664:
665: /*
666: * Read/write zs serial port.
667: */
668: int
669: zsread(dev, uio, flags)
670: dev_t dev;
671: struct uio *uio;
672: int flags;
673: {
674: struct zstty_softc *zst;
675: struct tty *tp;
676:
677: zst = zstty_cd.cd_devs[minor(dev)];
678: tp = zst->zst_tty;
679:
680: return (*linesw[tp->t_line].l_read)(tp, uio, flags);
681: }
682:
683: int
684: zswrite(dev, uio, flags)
685: dev_t dev;
686: struct uio *uio;
687: int flags;
688: {
689: struct zstty_softc *zst;
690: struct tty *tp;
691:
692: zst = zstty_cd.cd_devs[minor(dev)];
693: tp = zst->zst_tty;
694:
695: return (*linesw[tp->t_line].l_write)(tp, uio, flags);
696: }
697:
698: #define TIOCFLAG_ALL (TIOCFLAG_SOFTCAR | TIOCFLAG_CLOCAL | \
699: TIOCFLAG_CRTSCTS | TIOCFLAG_MDMBUF )
700:
701: int
702: zsioctl(dev, cmd, data, flag, p)
703: dev_t dev;
704: u_long cmd;
705: caddr_t data;
706: int flag;
707: struct proc *p;
708: {
709: struct zstty_softc *zst;
710: struct zs_chanstate *cs;
711: struct tty *tp;
712: int error;
713: int s;
714:
715: zst = zstty_cd.cd_devs[minor(dev)];
716: cs = zst->zst_cs;
717: tp = zst->zst_tty;
718:
719: error = ((*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p));
720: if (error >= 0)
721: return (error);
722:
723: error = ttioctl(tp, cmd, data, flag, p);
724: if (error >= 0)
725: return (error);
726:
727: #ifdef ZS_MD_IOCTL
728: error = ZS_MD_IOCTL;
729: if (error >= 0)
730: return (error);
731: #endif /* ZS_MD_IOCTL */
732:
733: error = 0;
734:
735: s = splzs();
736:
737: switch (cmd) {
738: case TIOCSBRK:
739: zs_break(cs, 1);
740: break;
741:
742: case TIOCCBRK:
743: zs_break(cs, 0);
744: break;
745:
746: case TIOCGFLAGS:
747: *(int *)data = zst->zst_swflags;
748: break;
749:
750: case TIOCSFLAGS:
751: error = suser(p, 0);
752: if (error != 0)
753: break;
754: zst->zst_swflags = *(int *)data;
755: break;
756:
757: case TIOCSDTR:
758: zs_modem(zst, 1);
759: break;
760:
761: case TIOCCDTR:
762: zs_modem(zst, 0);
763: break;
764:
765: case TIOCMSET:
766: case TIOCMBIS:
767: case TIOCMBIC:
768: tiocm_to_zs(zst, cmd, *(int *)data);
769: break;
770:
771: case TIOCMGET:
772: *(int *)data = zs_to_tiocm(zst);
773: break;
774:
775: default:
776: error = ENOTTY;
777: break;
778: }
779:
780: splx(s);
781:
782: return (error);
783: }
784:
785: /*
786: * Start or restart transmission.
787: */
788: void
789: zsstart(tp)
790: struct tty *tp;
791: {
792: struct zstty_softc *zst;
793: struct zs_chanstate *cs;
794: int s;
795:
796: zst = zstty_cd.cd_devs[minor(tp->t_dev)];
797: cs = zst->zst_cs;
798:
799: s = spltty();
800: if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP))
801: goto out;
802: if (zst->zst_tx_stopped)
803: goto out;
804:
805: if (tp->t_outq.c_cc <= tp->t_lowat) {
806: if (ISSET(tp->t_state, TS_ASLEEP)) {
807: CLR(tp->t_state, TS_ASLEEP);
808: wakeup((caddr_t)&tp->t_outq);
809: }
810: selwakeup(&tp->t_wsel);
811: if (tp->t_outq.c_cc == 0)
812: goto out;
813: }
814:
815: /* Grab the first contiguous region of buffer space. */
816: {
817: u_char *tba;
818: int tbc;
819:
820: tba = tp->t_outq.c_cf;
821: tbc = ndqb(&tp->t_outq, 0);
822:
823: (void) splzs();
824:
825: zst->zst_tba = tba;
826: zst->zst_tbc = tbc;
827: }
828:
829: SET(tp->t_state, TS_BUSY);
830: zst->zst_tx_busy = 1;
831:
832: /* Enable transmit completion interrupts if necessary. */
833: if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) {
834: SET(cs->cs_preg[1], ZSWR1_TIE);
835: cs->cs_creg[1] = cs->cs_preg[1];
836: zs_write_reg(cs, 1, cs->cs_creg[1]);
837: }
838:
839: /* Output the first character of the contiguous buffer. */
840: {
841: zs_write_data(cs, *zst->zst_tba);
842: zst->zst_tbc--;
843: zst->zst_tba++;
844: }
845: out:
846: splx(s);
847: }
848:
849: /*
850: * Stop output, e.g., for ^S or output flush.
851: */
852: int
853: zsstop(tp, flag)
854: struct tty *tp;
855: int flag;
856: {
857: struct zstty_softc *zst;
858: struct zs_chanstate *cs;
859: int s;
860:
861: zst = zstty_cd.cd_devs[minor(tp->t_dev)];
862: cs = zst->zst_cs;
863:
864: s = splzs();
865: if (ISSET(tp->t_state, TS_BUSY)) {
866: /* Stop transmitting at the next chunk. */
867: zst->zst_tbc = 0;
868: zst->zst_heldtbc = 0;
869: if (!ISSET(tp->t_state, TS_TTSTOP))
870: SET(tp->t_state, TS_FLUSH);
871: }
872: splx(s);
873: return (0);
874: }
875:
876: /*
877: * Set ZS tty parameters from termios.
878: * XXX - Should just copy the whole termios after
879: * making sure all the changes could be done.
880: */
881: int
882: zsparam(tp, t)
883: struct tty *tp;
884: struct termios *t;
885: {
886: struct zstty_softc *zst;
887: struct zs_chanstate *cs;
888: int ospeed, cflag;
889: u_char tmp3, tmp4, tmp5;
890: int s, error;
891:
892: zst = zstty_cd.cd_devs[minor(tp->t_dev)];
893: cs = zst->zst_cs;
894:
895: ospeed = t->c_ospeed;
896: cflag = t->c_cflag;
897:
898: /* Check requested parameters. */
899: if (ospeed < 0)
900: return (EINVAL);
901: if (t->c_ispeed && t->c_ispeed != ospeed)
902: return (EINVAL);
903:
904: /*
905: * For the console, always force CLOCAL and !HUPCL, so that the port
906: * is always active.
907: */
908: if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) ||
909: ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) {
910: SET(cflag, CLOCAL);
911: CLR(cflag, HUPCL);
912: }
913:
914: /*
915: * Only whack the UART when params change.
916: * Some callers need to clear tp->t_ospeed
917: * to make sure initialization gets done.
918: */
919: if (tp->t_ospeed == ospeed &&
920: tp->t_cflag == cflag)
921: return (0);
922:
923: /*
924: * Call MD functions to deal with changed
925: * clock modes or H/W flow control modes.
926: * The BRG divisor is set now. (reg 12,13)
927: */
928: error = zs_set_speed(cs, ospeed);
929: if (error)
930: return (error);
931: error = zs_set_modes(cs, cflag);
932: if (error)
933: return (error);
934:
935: /*
936: * Block interrupts so that state will not
937: * be altered until we are done setting it up.
938: *
939: * Initial values in cs_preg are set before
940: * our attach routine is called. The master
941: * interrupt enable is handled by zsc.c
942: */
943: s = splzs();
944:
945: /*
946: * Recalculate which status ints to enable.
947: */
948: zs_maskintr(zst);
949:
950: /* Recompute character size bits. */
951: tmp3 = cs->cs_preg[3];
952: tmp5 = cs->cs_preg[5];
953: CLR(tmp3, ZSWR3_RXSIZE);
954: CLR(tmp5, ZSWR5_TXSIZE);
955: switch (ISSET(cflag, CSIZE)) {
956: case CS5:
957: SET(tmp3, ZSWR3_RX_5);
958: SET(tmp5, ZSWR5_TX_5);
959: break;
960: case CS6:
961: SET(tmp3, ZSWR3_RX_6);
962: SET(tmp5, ZSWR5_TX_6);
963: break;
964: case CS7:
965: SET(tmp3, ZSWR3_RX_7);
966: SET(tmp5, ZSWR5_TX_7);
967: break;
968: case CS8:
969: SET(tmp3, ZSWR3_RX_8);
970: SET(tmp5, ZSWR5_TX_8);
971: break;
972: }
973: cs->cs_preg[3] = tmp3;
974: cs->cs_preg[5] = tmp5;
975:
976: /*
977: * Recompute the stop bits and parity bits. Note that
978: * zs_set_speed() may have set clock selection bits etc.
979: * in wr4, so those must preserved.
980: */
981: tmp4 = cs->cs_preg[4];
982: CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK);
983: if (ISSET(cflag, CSTOPB))
984: SET(tmp4, ZSWR4_TWOSB);
985: else
986: SET(tmp4, ZSWR4_ONESB);
987: if (!ISSET(cflag, PARODD))
988: SET(tmp4, ZSWR4_EVENP);
989: if (ISSET(cflag, PARENB))
990: SET(tmp4, ZSWR4_PARENB);
991: cs->cs_preg[4] = tmp4;
992:
993: /* And copy to tty. */
994: tp->t_ispeed = 0;
995: tp->t_ospeed = ospeed;
996: tp->t_cflag = cflag;
997:
998: /*
999: * If nothing is being transmitted, set up new current values,
1000: * else mark them as pending.
1001: */
1002: if (!cs->cs_heldchange) {
1003: if (zst->zst_tx_busy) {
1004: zst->zst_heldtbc = zst->zst_tbc;
1005: zst->zst_tbc = 0;
1006: cs->cs_heldchange = 1;
1007: } else
1008: zs_loadchannelregs(cs);
1009: }
1010:
1011: /*
1012: * If hardware flow control is disabled, turn off the buffer water
1013: * marks and unblock any soft flow control state. Otherwise, enable
1014: * the water marks.
1015: */
1016: if (!ISSET(cflag, CHWFLOW)) {
1017: zst->zst_r_hiwat = 0;
1018: zst->zst_r_lowat = 0;
1019: if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) {
1020: CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED);
1021: zst->zst_rx_ready = 1;
1022: cs->cs_softreq = 1;
1023: }
1024: if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) {
1025: CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED);
1026: zs_hwiflow(zst);
1027: }
1028: } else {
1029: zst->zst_r_hiwat = zstty_rbuf_hiwat;
1030: zst->zst_r_lowat = zstty_rbuf_lowat;
1031: }
1032:
1033: /*
1034: * Force a recheck of the hardware carrier and flow control status,
1035: * since we may have changed which bits we're looking at.
1036: */
1037: zstty_stint(cs, 1);
1038:
1039: splx(s);
1040:
1041: /*
1042: * If hardware flow control is disabled, unblock any hard flow control
1043: * state.
1044: */
1045: if (!ISSET(cflag, CHWFLOW)) {
1046: if (zst->zst_tx_stopped) {
1047: zst->zst_tx_stopped = 0;
1048: zsstart(tp);
1049: }
1050: }
1051:
1052: zstty_softint(cs);
1053:
1054: return (0);
1055: }
1056:
1057: /*
1058: * Compute interrupt enable bits and set in the pending bits. Called both
1059: * in zsparam() and when PPS (pulse per second timing) state changes.
1060: * Must be called at splzs().
1061: */
1062: void
1063: zs_maskintr(zst)
1064: struct zstty_softc *zst;
1065: {
1066: struct zs_chanstate *cs = zst->zst_cs;
1067: int tmp15;
1068:
1069: cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd;
1070: if (zst->zst_ppsmask != 0)
1071: cs->cs_rr0_mask |= cs->cs_rr0_pps;
1072: tmp15 = cs->cs_preg[15];
1073: if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD))
1074: SET(tmp15, ZSWR15_DCD_IE);
1075: else
1076: CLR(tmp15, ZSWR15_DCD_IE);
1077: if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS))
1078: SET(tmp15, ZSWR15_CTS_IE);
1079: else
1080: CLR(tmp15, ZSWR15_CTS_IE);
1081: cs->cs_preg[15] = tmp15;
1082: }
1083:
1084: /*
1085: * Raise or lower modem control (DTR/RTS) signals. If a character is
1086: * in transmission, the change is deferred.
1087: */
1088: void
1089: zs_modem(zst, onoff)
1090: struct zstty_softc *zst;
1091: int onoff;
1092: {
1093: struct zs_chanstate *cs = zst->zst_cs;
1094:
1095: if (cs->cs_wr5_dtr == 0)
1096: return;
1097:
1098: if (onoff)
1099: SET(cs->cs_preg[5], cs->cs_wr5_dtr);
1100: else
1101: CLR(cs->cs_preg[5], cs->cs_wr5_dtr);
1102:
1103: if (!cs->cs_heldchange) {
1104: if (zst->zst_tx_busy) {
1105: zst->zst_heldtbc = zst->zst_tbc;
1106: zst->zst_tbc = 0;
1107: cs->cs_heldchange = 1;
1108: } else
1109: zs_loadchannelregs(cs);
1110: }
1111: }
1112:
1113: void
1114: tiocm_to_zs(zst, how, ttybits)
1115: struct zstty_softc *zst;
1116: u_long how;
1117: int ttybits;
1118: {
1119: struct zs_chanstate *cs = zst->zst_cs;
1120: u_char zsbits;
1121:
1122: zsbits = 0;
1123: if (ISSET(ttybits, TIOCM_DTR))
1124: SET(zsbits, ZSWR5_DTR);
1125: if (ISSET(ttybits, TIOCM_RTS))
1126: SET(zsbits, ZSWR5_RTS);
1127:
1128: switch (how) {
1129: case TIOCMBIC:
1130: CLR(cs->cs_preg[5], zsbits);
1131: break;
1132:
1133: case TIOCMBIS:
1134: SET(cs->cs_preg[5], zsbits);
1135: break;
1136:
1137: case TIOCMSET:
1138: CLR(cs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR);
1139: SET(cs->cs_preg[5], zsbits);
1140: break;
1141: }
1142:
1143: if (!cs->cs_heldchange) {
1144: if (zst->zst_tx_busy) {
1145: zst->zst_heldtbc = zst->zst_tbc;
1146: zst->zst_tbc = 0;
1147: cs->cs_heldchange = 1;
1148: } else
1149: zs_loadchannelregs(cs);
1150: }
1151: }
1152:
1153: int
1154: zs_to_tiocm(zst)
1155: struct zstty_softc *zst;
1156: {
1157: struct zs_chanstate *cs = zst->zst_cs;
1158: u_char zsbits;
1159: int ttybits = 0;
1160:
1161: zsbits = cs->cs_preg[5];
1162: if (ISSET(zsbits, ZSWR5_DTR))
1163: SET(ttybits, TIOCM_DTR);
1164: if (ISSET(zsbits, ZSWR5_RTS))
1165: SET(ttybits, TIOCM_RTS);
1166:
1167: zsbits = cs->cs_rr0;
1168: if (ISSET(zsbits, ZSRR0_DCD))
1169: SET(ttybits, TIOCM_CD);
1170: if (ISSET(zsbits, ZSRR0_CTS))
1171: SET(ttybits, TIOCM_CTS);
1172:
1173: return (ttybits);
1174: }
1175:
1176: /*
1177: * Try to block or unblock input using hardware flow-control.
1178: * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and
1179: * if this function returns non-zero, the TS_TBLOCK flag will
1180: * be set or cleared according to the "block" arg passed.
1181: */
1182: int
1183: zshwiflow(tp, block)
1184: struct tty *tp;
1185: int block;
1186: {
1187: struct zstty_softc *zst;
1188: struct zs_chanstate *cs;
1189: int s;
1190:
1191: zst = zstty_cd.cd_devs[minor(tp->t_dev)];
1192: cs = zst->zst_cs;
1193:
1194: if (cs->cs_wr5_rts == 0)
1195: return (0);
1196:
1197: s = splzs();
1198: if (block) {
1199: if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) {
1200: SET(zst->zst_rx_flags, RX_TTY_BLOCKED);
1201: zs_hwiflow(zst);
1202: }
1203: } else {
1204: if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) {
1205: CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED);
1206: zst->zst_rx_ready = 1;
1207: cs->cs_softreq = 1;
1208: }
1209: if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) {
1210: CLR(zst->zst_rx_flags, RX_TTY_BLOCKED);
1211: zs_hwiflow(zst);
1212: }
1213: }
1214: splx(s);
1215: return (1);
1216: }
1217:
1218: /*
1219: * Internal version of zshwiflow
1220: * called at splzs
1221: */
1222: void
1223: zs_hwiflow(zst)
1224: struct zstty_softc *zst;
1225: {
1226: struct zs_chanstate *cs = zst->zst_cs;
1227:
1228: if (cs->cs_wr5_rts == 0)
1229: return;
1230:
1231: if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) {
1232: CLR(cs->cs_preg[5], cs->cs_wr5_rts);
1233: CLR(cs->cs_creg[5], cs->cs_wr5_rts);
1234: } else {
1235: SET(cs->cs_preg[5], cs->cs_wr5_rts);
1236: SET(cs->cs_creg[5], cs->cs_wr5_rts);
1237: }
1238: zs_write_reg(cs, 5, cs->cs_creg[5]);
1239: }
1240:
1241:
1242: /****************************************************************
1243: * Interface to the lower layer (zscc)
1244: ****************************************************************/
1245:
1246: void zstty_rxsoft(struct zstty_softc *, struct tty *);
1247: void zstty_txsoft(struct zstty_softc *, struct tty *);
1248: void zstty_stsoft(struct zstty_softc *, struct tty *);
1249:
1250: /*
1251: * receiver ready interrupt.
1252: * called at splzs
1253: */
1254: void
1255: zstty_rxint(cs)
1256: struct zs_chanstate *cs;
1257: {
1258: struct zstty_softc *zst = cs->cs_private;
1259: u_char *put, *end;
1260: u_int cc;
1261: u_char rr0, rr1, c;
1262:
1263: end = zst->zst_ebuf;
1264: put = zst->zst_rbput;
1265: cc = zst->zst_rbavail;
1266:
1267: while (cc > 0) {
1268: /*
1269: * First read the status, because reading the received char
1270: * destroys the status of this char.
1271: */
1272: rr1 = zs_read_reg(cs, 1);
1273: c = zs_read_data(cs);
1274:
1275: if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) {
1276: /* Clear the receive error. */
1277: zs_write_csr(cs, ZSWR0_RESET_ERRORS);
1278: }
1279:
1280: put[0] = c;
1281: put[1] = rr1;
1282: put += 2;
1283: if (put >= end)
1284: put = zst->zst_rbuf;
1285: cc--;
1286:
1287: rr0 = zs_read_csr(cs);
1288: if (!ISSET(rr0, ZSRR0_RX_READY))
1289: break;
1290: }
1291:
1292: /*
1293: * Current string of incoming characters ended because
1294: * no more data was available or we ran out of space.
1295: * Schedule a receive event if any data was received.
1296: * If we're out of space, turn off receive interrupts.
1297: */
1298: zst->zst_rbput = put;
1299: zst->zst_rbavail = cc;
1300: if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) {
1301: zst->zst_rx_ready = 1;
1302: cs->cs_softreq = 1;
1303: }
1304:
1305: /*
1306: * See if we are in danger of overflowing a buffer. If
1307: * so, use hardware flow control to ease the pressure.
1308: */
1309: if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) &&
1310: cc < zst->zst_r_hiwat) {
1311: SET(zst->zst_rx_flags, RX_IBUF_BLOCKED);
1312: zs_hwiflow(zst);
1313: }
1314:
1315: /*
1316: * If we're out of space, disable receive interrupts
1317: * until the queue has drained a bit.
1318: */
1319: if (!cc) {
1320: SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED);
1321: CLR(cs->cs_preg[1], ZSWR1_RIE);
1322: cs->cs_creg[1] = cs->cs_preg[1];
1323: zs_write_reg(cs, 1, cs->cs_creg[1]);
1324: }
1325: }
1326:
1327: /*
1328: * transmitter ready interrupt. (splzs)
1329: */
1330: void
1331: zstty_txint(cs)
1332: struct zs_chanstate *cs;
1333: {
1334: struct zstty_softc *zst = cs->cs_private;
1335:
1336: /*
1337: * If we've delayed a parameter change, do it now, and restart
1338: * output.
1339: */
1340: if (cs->cs_heldchange) {
1341: zs_loadchannelregs(cs);
1342: cs->cs_heldchange = 0;
1343: zst->zst_tbc = zst->zst_heldtbc;
1344: zst->zst_heldtbc = 0;
1345: }
1346:
1347: /* Output the next character in the buffer, if any. */
1348: if (zst->zst_tbc > 0) {
1349: zs_write_data(cs, *zst->zst_tba);
1350: zst->zst_tbc--;
1351: zst->zst_tba++;
1352: } else {
1353: /* Disable transmit completion interrupts if necessary. */
1354: if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) {
1355: CLR(cs->cs_preg[1], ZSWR1_TIE);
1356: cs->cs_creg[1] = cs->cs_preg[1];
1357: zs_write_reg(cs, 1, cs->cs_creg[1]);
1358: }
1359: if (zst->zst_tx_busy) {
1360: zst->zst_tx_busy = 0;
1361: zst->zst_tx_done = 1;
1362: cs->cs_softreq = 1;
1363: }
1364: }
1365: }
1366:
1367: #ifdef DDB
1368: #include <ddb/db_var.h>
1369: #define DB_CONSOLE db_console
1370: #else
1371: #define DB_CONSOLE 1
1372: #endif
1373:
1374: /*
1375: * status change interrupt. (splzs)
1376: */
1377: void
1378: zstty_stint(cs, force)
1379: struct zs_chanstate *cs;
1380: int force;
1381: {
1382: struct zstty_softc *zst = cs->cs_private;
1383: struct tty *tp = zst->zst_tty;
1384: u_char rr0, delta;
1385:
1386: rr0 = zs_read_csr(cs);
1387: zs_write_csr(cs, ZSWR0_RESET_STATUS);
1388:
1389: /*
1390: * Check here for console break, so that we can abort
1391: * even when interrupts are locking up the machine.
1392: */
1393: if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) &&
1394: ISSET(rr0, ZSRR0_BREAK) && DB_CONSOLE)
1395: zs_abort(cs);
1396:
1397: if (!force)
1398: delta = rr0 ^ cs->cs_rr0;
1399: else
1400: delta = cs->cs_rr0_mask;
1401:
1402: ttytstamp(tp, cs->cs_rr0 & ZSRR0_CTS, rr0 & ZSRR0_CTS,
1403: cs->cs_rr0 & ZSRR0_DCD, rr0 & ZSRR0_DCD);
1404:
1405: cs->cs_rr0 = rr0;
1406:
1407: if (ISSET(delta, cs->cs_rr0_mask)) {
1408: SET(cs->cs_rr0_delta, delta);
1409:
1410: /*
1411: * Stop output immediately if we lose the output
1412: * flow control signal or carrier detect.
1413: */
1414: if (ISSET(~rr0, cs->cs_rr0_mask)) {
1415: zst->zst_tbc = 0;
1416: zst->zst_heldtbc = 0;
1417: }
1418:
1419: zst->zst_st_check = 1;
1420: cs->cs_softreq = 1;
1421: }
1422: }
1423:
1424: void
1425: zstty_diag(arg)
1426: void *arg;
1427: {
1428: struct zstty_softc *zst = arg;
1429: int overflows, floods;
1430: int s;
1431:
1432: s = splzs();
1433: overflows = zst->zst_overflows;
1434: zst->zst_overflows = 0;
1435: floods = zst->zst_floods;
1436: zst->zst_floods = 0;
1437: zst->zst_errors = 0;
1438: splx(s);
1439:
1440: log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n",
1441: zst->zst_dev.dv_xname,
1442: overflows, overflows == 1 ? "" : "s",
1443: floods, floods == 1 ? "" : "s");
1444: }
1445:
1446: void
1447: zstty_rxsoft(zst, tp)
1448: struct zstty_softc *zst;
1449: struct tty *tp;
1450: {
1451: struct zs_chanstate *cs = zst->zst_cs;
1452: int (*rint)(int c, struct tty *tp) = linesw[tp->t_line].l_rint;
1453: u_char *get, *end;
1454: u_int cc, scc;
1455: u_char rr1;
1456: int code;
1457: int s;
1458:
1459: end = zst->zst_ebuf;
1460: get = zst->zst_rbget;
1461: scc = cc = zstty_rbuf_size - zst->zst_rbavail;
1462:
1463: if (cc == zstty_rbuf_size) {
1464: zst->zst_floods++;
1465: if (zst->zst_errors++ == 0)
1466: timeout_add(&zst->zst_diag_ch, 60 * hz);
1467: }
1468:
1469: /* If not yet open, drop the entire buffer content here */
1470: if (!ISSET(tp->t_state, TS_ISOPEN)) {
1471: get += cc << 1;
1472: if (get >= end)
1473: get -= zstty_rbuf_size << 1;
1474: cc = 0;
1475: }
1476: while (cc) {
1477: code = get[0];
1478: rr1 = get[1];
1479: if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) {
1480: if (ISSET(rr1, ZSRR1_DO)) {
1481: zst->zst_overflows++;
1482: if (zst->zst_errors++ == 0)
1483: timeout_add(&zst->zst_diag_ch, 60 * hz);
1484: }
1485: if (ISSET(rr1, ZSRR1_FE))
1486: SET(code, TTY_FE);
1487: if (ISSET(rr1, ZSRR1_PE))
1488: SET(code, TTY_PE);
1489: }
1490: if ((*rint)(code, tp) == -1) {
1491: /*
1492: * The line discipline's buffer is out of space.
1493: */
1494: if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) {
1495: /*
1496: * We're either not using flow control, or the
1497: * line discipline didn't tell us to block for
1498: * some reason. Either way, we have no way to
1499: * know when there's more space available, so
1500: * just drop the rest of the data.
1501: */
1502: get += cc << 1;
1503: if (get >= end)
1504: get -= zstty_rbuf_size << 1;
1505: cc = 0;
1506: } else {
1507: /*
1508: * Don't schedule any more receive processing
1509: * until the line discipline tells us there's
1510: * space available (through comhwiflow()).
1511: * Leave the rest of the data in the input
1512: * buffer.
1513: */
1514: SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED);
1515: }
1516: break;
1517: }
1518: get += 2;
1519: if (get >= end)
1520: get = zst->zst_rbuf;
1521: cc--;
1522: }
1523:
1524: if (cc != scc) {
1525: zst->zst_rbget = get;
1526: s = splzs();
1527: cc = zst->zst_rbavail += scc - cc;
1528: /* Buffers should be ok again, release possible block. */
1529: if (cc >= zst->zst_r_lowat) {
1530: if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) {
1531: CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED);
1532: SET(cs->cs_preg[1], ZSWR1_RIE);
1533: cs->cs_creg[1] = cs->cs_preg[1];
1534: zs_write_reg(cs, 1, cs->cs_creg[1]);
1535: }
1536: if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) {
1537: CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED);
1538: zs_hwiflow(zst);
1539: }
1540: }
1541: splx(s);
1542: }
1543: }
1544:
1545: void
1546: zstty_txsoft(zst, tp)
1547: struct zstty_softc *zst;
1548: struct tty *tp;
1549: {
1550:
1551: CLR(tp->t_state, TS_BUSY);
1552: if (ISSET(tp->t_state, TS_FLUSH))
1553: CLR(tp->t_state, TS_FLUSH);
1554: else
1555: ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf));
1556: (*linesw[tp->t_line].l_start)(tp);
1557: }
1558:
1559: void
1560: zstty_stsoft(zst, tp)
1561: struct zstty_softc *zst;
1562: struct tty *tp;
1563: {
1564: struct zs_chanstate *cs = zst->zst_cs;
1565: u_char rr0, delta;
1566: int s;
1567:
1568: s = splzs();
1569: rr0 = cs->cs_rr0;
1570: delta = cs->cs_rr0_delta;
1571: cs->cs_rr0_delta = 0;
1572: splx(s);
1573:
1574: if (ISSET(delta, cs->cs_rr0_dcd)) {
1575: /*
1576: * Inform the tty layer that carrier detect changed.
1577: */
1578: (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(rr0, ZSRR0_DCD));
1579: }
1580:
1581: if (ISSET(delta, cs->cs_rr0_cts)) {
1582: /* Block or unblock output according to flow control. */
1583: if (ISSET(rr0, cs->cs_rr0_cts)) {
1584: zst->zst_tx_stopped = 0;
1585: (*linesw[tp->t_line].l_start)(tp);
1586: } else {
1587: zst->zst_tx_stopped = 1;
1588: }
1589: }
1590: }
1591:
1592: /*
1593: * Software interrupt. Called at zssoft
1594: *
1595: * The main job to be done here is to empty the input ring
1596: * by passing its contents up to the tty layer. The ring is
1597: * always emptied during this operation, therefore the ring
1598: * must not be larger than the space after "high water" in
1599: * the tty layer, or the tty layer might drop our input.
1600: *
1601: * Note: an "input blockage" condition is assumed to exist if
1602: * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set.
1603: */
1604: void
1605: zstty_softint(cs)
1606: struct zs_chanstate *cs;
1607: {
1608: struct zstty_softc *zst = cs->cs_private;
1609: struct tty *tp = zst->zst_tty;
1610: int s;
1611:
1612: s = spltty();
1613:
1614: if (zst->zst_rx_ready) {
1615: zst->zst_rx_ready = 0;
1616: zstty_rxsoft(zst, tp);
1617: }
1618:
1619: if (zst->zst_st_check) {
1620: zst->zst_st_check = 0;
1621: zstty_stsoft(zst, tp);
1622: }
1623:
1624: if (zst->zst_tx_done) {
1625: zst->zst_tx_done = 0;
1626: zstty_txsoft(zst, tp);
1627: }
1628:
1629: splx(s);
1630: }
1631:
1632: struct zsops zsops_tty = {
1633: zstty_rxint, /* receive char available */
1634: zstty_stint, /* external/status */
1635: zstty_txint, /* xmit buffer empty */
1636: zstty_softint, /* process software interrupt */
1637: };