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1.1 nbrk 1: /* $OpenBSD: z8530tty.c,v 1.6 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 <macppc/dev/z8530reg.h>
112: #include <machine/z8530var.h>
113:
114: #include <dev/cons.h>
115:
116: #ifdef KGDB
117: extern int zs_check_kgdb();
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(struct device *parent, void *match, void *aux)
241: {
242: struct cfdata *cf = match;
243: struct zsc_attach_args *args = aux;
244:
245: /* Exact match is better than wildcard. */
246: if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel)
247: return 2;
248:
249: /* This driver accepts wildcard. */
250: if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT)
251: return 1;
252:
253: return 0;
254: }
255:
256: void
257: zstty_attach(struct device *parent, struct device *self, void *aux)
258: {
259: struct zsc_softc *zsc = (void *) parent;
260: struct zstty_softc *zst = (void *) self;
261: struct zsc_attach_args *args = aux;
262: struct zs_chanstate *cs;
263: struct cfdata *cf;
264: struct tty *tp;
265: int channel, s, tty_unit;
266: dev_t dev;
267: char *i, *o;
268: int maj;
269:
270: cf = zst->zst_dev.dv_cfdata;
271:
272: timeout_set(&zst->zst_diag_ch, zstty_diag, zst);
273:
274: tty_unit = zst->zst_dev.dv_unit;
275: channel = args->channel;
276: cs = zsc->zsc_cs[channel];
277: cs->cs_private = zst;
278: cs->cs_ops = &zsops_tty;
279:
280: zst->zst_cs = cs;
281: zst->zst_swflags = cf->cf_flags; /* softcar, etc. */
282: zst->zst_hwflags = args->hwflags;
283: /* locate the major number */
284: for (maj = 0; maj < nchrdev; maj++)
285: if (cdevsw[maj].d_open == zsopen)
286: break;
287:
288: dev = makedev(maj, tty_unit);
289:
290: if (zst->zst_swflags)
291: printf(" flags 0x%x", zst->zst_swflags);
292:
293: /*
294: * Check whether we serve as a console device.
295: * XXX - split console input/output channels aren't
296: * supported yet on /dev/console
297: */
298: i = o = NULL;
299: if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) != 0) {
300: i = "input";
301: if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) {
302: args->consdev->cn_dev = dev;
303: cn_tab->cn_pollc = args->consdev->cn_pollc;
304: cn_tab->cn_getc = args->consdev->cn_getc;
305: }
306: cn_tab->cn_dev = dev;
307: /* Set console magic to BREAK */
308: }
309: if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_OUTPUT) != 0) {
310: o = "output";
311: if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) {
312: cn_tab->cn_putc = args->consdev->cn_putc;
313: }
314: cn_tab->cn_dev = dev;
315: }
316: if (i != NULL || o != NULL)
317: printf(" (console %s)", i ? (o ? "i/o" : i) : o);
318:
319: #ifdef KGDB
320: /*
321: * Allow kgdb to "take over" this port. If this port is
322: * NOT the kgdb port, zs_check_kgdb() will return zero.
323: * If it IS the kgdb port, it will print "kgdb,...\n"
324: * and then return non-zero.
325: */
326: if (zs_check_kgdb(cs, dev)) {
327: printf(" (kgdb)\n");
328: /*
329: * This is the kgdb port (exclusive use)
330: * so skip the normal attach code.
331: */
332: return;
333: }
334: #endif
335:
336: if (strcmp(args->type, "keyboard") == 0 ||
337: strcmp(args->type, "mouse") == 0)
338: printf(": %s", args->type);
339:
340: printf("\n");
341:
342: tp = ttymalloc();
343: tp->t_dev = dev;
344: tp->t_oproc = zsstart;
345: tp->t_param = zsparam;
346: tp->t_hwiflow = zshwiflow;
347:
348: zst->zst_tty = tp;
349: zst->zst_rbuf = malloc(zstty_rbuf_size << 1, M_DEVBUF, M_WAITOK);
350: zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1);
351: /* Disable the high water mark. */
352: zst->zst_r_hiwat = 0;
353: zst->zst_r_lowat = 0;
354: zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf;
355: zst->zst_rbavail = zstty_rbuf_size;
356:
357: /* if there are no enable/disable functions, assume the device
358: is always enabled */
359: if (!cs->enable)
360: cs->enabled = 1;
361:
362: /*
363: * Hardware init
364: */
365: if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) {
366: /* Call zsparam similar to open. */
367: struct termios t;
368:
369: /* Wait a while for previous console output to complete */
370: DELAY(10000);
371:
372: /* Setup the "new" parameters in t. */
373: t.c_ispeed = 0;
374: t.c_ospeed = cs->cs_defspeed;
375: t.c_cflag = cs->cs_defcflag;
376:
377: s = splzs();
378:
379: /*
380: * Turn on receiver and status interrupts.
381: * We defer the actual write of the register to zsparam(),
382: * but we must make sure status interrupts are turned on by
383: * the time zsparam() reads the initial rr0 state.
384: */
385: SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE);
386:
387: splx(s);
388:
389: /* Make sure zsparam will see changes. */
390: tp->t_ospeed = 0;
391: (void) zsparam(tp, &t);
392:
393: s = splzs();
394:
395: /* Make sure DTR is on now. */
396: zs_modem(zst, 1);
397:
398: splx(s);
399: } else if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_NORESET)) {
400: /* Not the console; may need reset. */
401: int reset;
402:
403: reset = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET;
404:
405: s = splzs();
406:
407: zs_write_reg(cs, 9, reset);
408:
409: /* Will raise DTR in open. */
410: zs_modem(zst, 0);
411:
412: splx(s);
413: }
414: }
415:
416:
417: /*
418: * Return pointer to our tty.
419: */
420: struct tty *
421: zstty(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(struct zstty_softc *zst)
437: {
438: struct zs_chanstate *cs = zst->zst_cs;
439: struct tty *tp = zst->zst_tty;
440: int s;
441:
442: s = splzs();
443:
444: /* If we were asserting flow control, then deassert it. */
445: SET(zst->zst_rx_flags, RX_IBUF_BLOCKED);
446: zs_hwiflow(zst);
447:
448: /* Clear any break condition set with TIOCSBRK. */
449: zs_break(cs, 0);
450:
451: /* Turn off PPS capture on last close. */
452: zst->zst_ppsmask = 0;
453:
454: /*
455: * Hang up if necessary. Wait a bit, so the other side has time to
456: * notice even if we immediately open the port again.
457: */
458: if (ISSET(tp->t_cflag, HUPCL)) {
459: zs_modem(zst, 0);
460: (void) tsleep(cs, TTIPRI, ttclos, hz);
461: }
462:
463: /* Turn off interrupts if not the console. */
464: if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) {
465: CLR(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE);
466: cs->cs_creg[1] = cs->cs_preg[1];
467: zs_write_reg(cs, 1, cs->cs_creg[1]);
468: }
469:
470: /* Call the power management hook. */
471: if (cs->disable) {
472: #ifdef DIAGNOSTIC
473: if (!cs->enabled)
474: panic("zs_shutdown: not enabled?");
475: #endif
476: (*cs->disable)(zst->zst_cs);
477: }
478:
479: splx(s);
480: }
481:
482: /*
483: * Open a zs serial (tty) port.
484: */
485: int
486: zsopen(dev_t dev, int flags, int mode, struct proc *p)
487: {
488: struct tty *tp;
489: struct zs_chanstate *cs;
490: struct zstty_softc *zst;
491: int s, s2;
492: int error, unit;
493:
494: unit = minor(dev);
495: if (unit >= zstty_cd.cd_ndevs)
496: return (ENXIO);
497: zst = zstty_cd.cd_devs[unit];
498: if (zst == NULL)
499: return (ENXIO);
500: tp = zst->zst_tty;
501: cs = zst->zst_cs;
502:
503: /* If KGDB took the line, then tp==NULL */
504: if (tp == NULL)
505: return (EBUSY);
506:
507: if (ISSET(tp->t_state, TS_ISOPEN) &&
508: ISSET(tp->t_state, TS_XCLUDE) &&
509: p->p_ucred->cr_uid != 0)
510: return (EBUSY);
511:
512: s = spltty();
513:
514: /*
515: * Do the following iff this is a first open.
516: */
517: if (!ISSET(tp->t_state, TS_ISOPEN)) {
518: struct termios t;
519:
520: tp->t_dev = dev;
521:
522: /* Call the power management hook. */
523: if (cs->enable) {
524: if ((*cs->enable)(cs)) {
525: splx(s);
526: printf("%s: device enable failed\n",
527: zst->zst_dev.dv_xname);
528: return (EIO);
529: }
530: }
531:
532: /*
533: * Initialize the termios status to the defaults. Add in the
534: * sticky bits from TIOCSFLAGS.
535: */
536: t.c_ispeed = 0;
537: t.c_ospeed = cs->cs_defspeed;
538: t.c_cflag = cs->cs_defcflag;
539: if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL))
540: SET(t.c_cflag, CLOCAL);
541: if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS))
542: SET(t.c_cflag, CRTSCTS);
543: if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF))
544: SET(t.c_cflag, MDMBUF);
545:
546: s2 = splzs();
547:
548: /*
549: * Turn on receiver and status interrupts.
550: * We defer the actual write of the register to zsparam(),
551: * but we must make sure status interrupts are turned on by
552: * the time zsparam() reads the initial rr0 state.
553: */
554: SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE);
555:
556: /* Clear PPS capture state on first open. */
557: zst->zst_ppsmask = 0;
558:
559: splx(s2);
560:
561: /* Make sure zsparam will see changes. */
562: tp->t_ospeed = 0;
563: (void) zsparam(tp, &t);
564:
565: /*
566: * Note: zsparam has done: cflag, ispeed, ospeed
567: * so we just need to do: iflag, oflag, lflag, cc
568: * For "raw" mode, just leave all zeros.
569: */
570: if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) {
571: tp->t_iflag = TTYDEF_IFLAG;
572: tp->t_oflag = TTYDEF_OFLAG;
573: tp->t_lflag = TTYDEF_LFLAG;
574: } else {
575: tp->t_iflag = 0;
576: tp->t_oflag = 0;
577: tp->t_lflag = 0;
578: }
579: ttychars(tp);
580: ttsetwater(tp);
581:
582: s2 = splzs();
583:
584: /*
585: * Turn on DTR. We must always do this, even if carrier is not
586: * present, because otherwise we'd have to use TIOCSDTR
587: * immediately after setting CLOCAL, which applications do not
588: * expect. We always assert DTR while the device is open
589: * unless explicitly requested to deassert it.
590: */
591: zs_modem(zst, 1);
592:
593: /* Clear the input ring, and unblock. */
594: zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf;
595: zst->zst_rbavail = zstty_rbuf_size;
596: zs_iflush(cs);
597: CLR(zst->zst_rx_flags, RX_ANY_BLOCK);
598: zs_hwiflow(zst);
599:
600: splx(s2);
601: }
602:
603: splx(s);
604:
605: error = ((*linesw[tp->t_line].l_open)(dev, tp));
606: if (error)
607: goto bad;
608:
609: return (0);
610:
611: bad:
612: if (!ISSET(tp->t_state, TS_ISOPEN)) {
613: /*
614: * We failed to open the device, and nobody else had it opened.
615: * Clean up the state as appropriate.
616: */
617: zs_shutdown(zst);
618: }
619:
620: return (error);
621: }
622:
623: /*
624: * Close a zs serial port.
625: */
626: int
627: zsclose(dev_t dev, int flags, int mode, struct proc *p)
628: {
629: struct zstty_softc *zst;
630: struct zs_chanstate *cs;
631: struct tty *tp;
632:
633: zst = zstty_cd.cd_devs[minor(dev)];
634: cs = zst->zst_cs;
635: tp = zst->zst_tty;
636:
637: /* XXX This is for cons.c. */
638: if (!ISSET(tp->t_state, TS_ISOPEN))
639: return 0;
640:
641: (*linesw[tp->t_line].l_close)(tp, flags);
642: ttyclose(tp);
643:
644: if (!ISSET(tp->t_state, TS_ISOPEN)) {
645: /*
646: * Although we got a last close, the device may still be in
647: * use; e.g. if this was the dialout node, and there are still
648: * processes waiting for carrier on the non-dialout node.
649: */
650: zs_shutdown(zst);
651: }
652:
653: return (0);
654: }
655:
656: /*
657: * Read/write zs serial port.
658: */
659: int
660: zsread(dev_t dev, struct uio *uio, int flags)
661: {
662: struct zstty_softc *zst;
663: struct tty *tp;
664:
665: zst = zstty_cd.cd_devs[minor(dev)];
666: tp = zst->zst_tty;
667:
668: return (*linesw[tp->t_line].l_read)(tp, uio, flags);
669: }
670:
671: int
672: zswrite(dev_t dev, struct uio *uio, 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_write)(tp, uio, flags);
681: }
682:
683: #define TIOCFLAG_ALL (TIOCFLAG_SOFTCAR | TIOCFLAG_CLOCAL | \
684: TIOCFLAG_CRTSCTS | TIOCFLAG_MDMBUF )
685:
686: int
687: zsioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
688: {
689: struct zstty_softc *zst;
690: struct zs_chanstate *cs;
691: struct tty *tp;
692: int error;
693: int s;
694:
695: zst = zstty_cd.cd_devs[minor(dev)];
696: cs = zst->zst_cs;
697: tp = zst->zst_tty;
698:
699: error = ((*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p));
700: if (error >= 0)
701: return (error);
702:
703: error = ttioctl(tp, cmd, data, flag, p);
704: if (error >= 0)
705: return (error);
706:
707: #ifdef ZS_MD_IOCTL
708: error = ZS_MD_IOCTL;
709: if (error >= 0)
710: return (error);
711: #endif /* ZS_MD_IOCTL */
712:
713: error = 0;
714:
715: s = splzs();
716:
717: switch (cmd) {
718: case TIOCSBRK:
719: zs_break(cs, 1);
720: break;
721:
722: case TIOCCBRK:
723: zs_break(cs, 0);
724: break;
725:
726: case TIOCGFLAGS:
727: *(int *)data = zst->zst_swflags;
728: break;
729:
730: case TIOCSFLAGS:
731: error = suser(p, 0);
732: if (error != 0)
733: break;
734: zst->zst_swflags = *(int *)data;
735: break;
736:
737: case TIOCSDTR:
738: zs_modem(zst, 1);
739: break;
740:
741: case TIOCCDTR:
742: zs_modem(zst, 0);
743: break;
744:
745: case TIOCMSET:
746: case TIOCMBIS:
747: case TIOCMBIC:
748: tiocm_to_zs(zst, cmd, *(int *)data);
749: break;
750:
751: case TIOCMGET:
752: *(int *)data = zs_to_tiocm(zst);
753: break;
754:
755: default:
756: error = ENOTTY;
757: break;
758: }
759:
760: splx(s);
761:
762: return (error);
763: }
764:
765: /*
766: * Start or restart transmission.
767: */
768: void
769: zsstart(struct tty *tp)
770: {
771: struct zstty_softc *zst;
772: struct zs_chanstate *cs;
773: int s;
774:
775: zst = zstty_cd.cd_devs[minor(tp->t_dev)];
776: cs = zst->zst_cs;
777:
778: s = spltty();
779: if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP))
780: goto out;
781: if (zst->zst_tx_stopped)
782: goto out;
783:
784: if (tp->t_outq.c_cc <= tp->t_lowat) {
785: if (ISSET(tp->t_state, TS_ASLEEP)) {
786: CLR(tp->t_state, TS_ASLEEP);
787: wakeup((caddr_t)&tp->t_outq);
788: }
789: selwakeup(&tp->t_wsel);
790: if (tp->t_outq.c_cc == 0)
791: goto out;
792: }
793:
794: /* Grab the first contiguous region of buffer space. */
795: {
796: u_char *tba;
797: int tbc;
798:
799: tba = tp->t_outq.c_cf;
800: tbc = ndqb(&tp->t_outq, 0);
801:
802: (void) splzs();
803:
804: zst->zst_tba = tba;
805: zst->zst_tbc = tbc;
806: }
807:
808: SET(tp->t_state, TS_BUSY);
809: zst->zst_tx_busy = 1;
810:
811: /* Enable transmit completion interrupts if necessary. */
812: if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) {
813: SET(cs->cs_preg[1], ZSWR1_TIE);
814: cs->cs_creg[1] = cs->cs_preg[1];
815: zs_write_reg(cs, 1, cs->cs_creg[1]);
816: }
817:
818: /* Output the first character of the contiguous buffer. */
819: zs_write_data(cs, *zst->zst_tba);
820: zst->zst_tbc--;
821: zst->zst_tba++;
822: out:
823: splx(s);
824: }
825:
826: /*
827: * Stop output, e.g., for ^S or output flush.
828: */
829: int
830: zsstop(struct tty *tp, int flag)
831: {
832: struct zstty_softc *zst;
833: struct zs_chanstate *cs;
834: int s;
835:
836: zst = zstty_cd.cd_devs[minor(tp->t_dev)];
837: cs = zst->zst_cs;
838:
839: s = splzs();
840: if (ISSET(tp->t_state, TS_BUSY)) {
841: /* Stop transmitting at the next chunk. */
842: zst->zst_tbc = 0;
843: zst->zst_heldtbc = 0;
844: if (!ISSET(tp->t_state, TS_TTSTOP))
845: SET(tp->t_state, TS_FLUSH);
846: }
847: splx(s);
848: return (0);
849: }
850:
851: /*
852: * Set ZS tty parameters from termios.
853: * XXX - Should just copy the whole termios after
854: * making sure all the changes could be done.
855: */
856: int
857: zsparam(struct tty *tp, struct termios *t)
858: {
859: struct zstty_softc *zst;
860: struct zs_chanstate *cs;
861: int ospeed, cflag;
862: u_char tmp3, tmp4, tmp5;
863: int s, error;
864:
865: zst = zstty_cd.cd_devs[minor(tp->t_dev)];
866: cs = zst->zst_cs;
867:
868: ospeed = t->c_ospeed;
869: cflag = t->c_cflag;
870:
871: /* Check requested parameters. */
872: if (ospeed < 0)
873: return (EINVAL);
874: if (t->c_ispeed && t->c_ispeed != ospeed)
875: return (EINVAL);
876:
877: /*
878: * For the console, always force CLOCAL and !HUPCL, so that the port
879: * is always active.
880: */
881: if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) ||
882: ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) {
883: SET(cflag, CLOCAL);
884: CLR(cflag, HUPCL);
885: }
886:
887: /*
888: * Only whack the UART when params change.
889: * Some callers need to clear tp->t_ospeed
890: * to make sure initialization gets done.
891: */
892: if (tp->t_ospeed == ospeed &&
893: tp->t_cflag == cflag)
894: return (0);
895:
896: /*
897: * Call MD functions to deal with changed
898: * clock modes or H/W flow control modes.
899: * The BRG divisor is set now. (reg 12,13)
900: */
901: error = zs_set_speed(cs, ospeed);
902: if (error)
903: return (error);
904: error = zs_set_modes(cs, cflag);
905: if (error)
906: return (error);
907:
908: /*
909: * Block interrupts so that state will not
910: * be altered until we are done setting it up.
911: *
912: * Initial values in cs_preg are set before
913: * our attach routine is called. The master
914: * interrupt enable is handled by zsc.c
915: */
916: s = splzs();
917:
918: /*
919: * Recalculate which status ints to enable.
920: */
921: zs_maskintr(zst);
922:
923: /* Recompute character size bits. */
924: tmp3 = cs->cs_preg[3];
925: tmp5 = cs->cs_preg[5];
926: CLR(tmp3, ZSWR3_RXSIZE);
927: CLR(tmp5, ZSWR5_TXSIZE);
928: switch (ISSET(cflag, CSIZE)) {
929: case CS5:
930: SET(tmp3, ZSWR3_RX_5);
931: SET(tmp5, ZSWR5_TX_5);
932: break;
933: case CS6:
934: SET(tmp3, ZSWR3_RX_6);
935: SET(tmp5, ZSWR5_TX_6);
936: break;
937: case CS7:
938: SET(tmp3, ZSWR3_RX_7);
939: SET(tmp5, ZSWR5_TX_7);
940: break;
941: case CS8:
942: SET(tmp3, ZSWR3_RX_8);
943: SET(tmp5, ZSWR5_TX_8);
944: break;
945: }
946: cs->cs_preg[3] = tmp3;
947: cs->cs_preg[5] = tmp5;
948:
949: /*
950: * Recompute the stop bits and parity bits. Note that
951: * zs_set_speed() may have set clock selection bits etc.
952: * in wr4, so those must preserved.
953: */
954: tmp4 = cs->cs_preg[4];
955: CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK);
956: if (ISSET(cflag, CSTOPB))
957: SET(tmp4, ZSWR4_TWOSB);
958: else
959: SET(tmp4, ZSWR4_ONESB);
960: if (!ISSET(cflag, PARODD))
961: SET(tmp4, ZSWR4_EVENP);
962: if (ISSET(cflag, PARENB))
963: SET(tmp4, ZSWR4_PARENB);
964: cs->cs_preg[4] = tmp4;
965:
966: /* And copy to tty. */
967: tp->t_ispeed = 0;
968: tp->t_ospeed = ospeed;
969: tp->t_cflag = cflag;
970:
971: /*
972: * If nothing is being transmitted, set up new current values,
973: * else mark them as pending.
974: */
975: if (!cs->cs_heldchange) {
976: if (zst->zst_tx_busy) {
977: zst->zst_heldtbc = zst->zst_tbc;
978: zst->zst_tbc = 0;
979: cs->cs_heldchange = 1;
980: } else
981: zs_loadchannelregs(cs);
982: }
983:
984: /*
985: * If hardware flow control is disabled, turn off the buffer water
986: * marks and unblock any soft flow control state. Otherwise, enable
987: * the water marks.
988: */
989: if (!ISSET(cflag, CHWFLOW)) {
990: zst->zst_r_hiwat = 0;
991: zst->zst_r_lowat = 0;
992: if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) {
993: CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED);
994: zst->zst_rx_ready = 1;
995: cs->cs_softreq = 1;
996: }
997: if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) {
998: CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED);
999: zs_hwiflow(zst);
1000: }
1001: } else {
1002: zst->zst_r_hiwat = zstty_rbuf_hiwat;
1003: zst->zst_r_lowat = zstty_rbuf_lowat;
1004: }
1005:
1006: /*
1007: * Force a recheck of the hardware carrier and flow control status,
1008: * since we may have changed which bits we're looking at.
1009: */
1010: zstty_stint(cs, 1);
1011:
1012: splx(s);
1013:
1014: /*
1015: * If hardware flow control is disabled, unblock any hard flow control
1016: * state.
1017: */
1018: if (!ISSET(cflag, CHWFLOW)) {
1019: if (zst->zst_tx_stopped) {
1020: zst->zst_tx_stopped = 0;
1021: zsstart(tp);
1022: }
1023: }
1024:
1025: zstty_softint(cs);
1026:
1027: return (0);
1028: }
1029:
1030: /*
1031: * Compute interrupt enable bits and set in the pending bits. Called both
1032: * in zsparam() and when PPS (pulse per second timing) state changes.
1033: * Must be called at splzs().
1034: */
1035: void
1036: zs_maskintr(struct zstty_softc *zst)
1037: {
1038: struct zs_chanstate *cs = zst->zst_cs;
1039: int tmp15;
1040:
1041: cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd;
1042: if (zst->zst_ppsmask != 0)
1043: cs->cs_rr0_mask |= cs->cs_rr0_pps;
1044: tmp15 = cs->cs_preg[15];
1045: if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD))
1046: SET(tmp15, ZSWR15_DCD_IE);
1047: else
1048: CLR(tmp15, ZSWR15_DCD_IE);
1049: if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS))
1050: SET(tmp15, ZSWR15_CTS_IE);
1051: else
1052: CLR(tmp15, ZSWR15_CTS_IE);
1053: cs->cs_preg[15] = tmp15;
1054: }
1055:
1056: /*
1057: * Raise or lower modem control (DTR/RTS) signals. If a character is
1058: * in transmission, the change is deferred.
1059: */
1060: void
1061: zs_modem(struct zstty_softc *zst, int onoff)
1062: {
1063: struct zs_chanstate *cs = zst->zst_cs;
1064:
1065: if (cs->cs_wr5_dtr == 0)
1066: return;
1067:
1068: if (onoff)
1069: SET(cs->cs_preg[5], cs->cs_wr5_dtr);
1070: else
1071: CLR(cs->cs_preg[5], cs->cs_wr5_dtr);
1072:
1073: if (!cs->cs_heldchange) {
1074: if (zst->zst_tx_busy) {
1075: zst->zst_heldtbc = zst->zst_tbc;
1076: zst->zst_tbc = 0;
1077: cs->cs_heldchange = 1;
1078: } else
1079: zs_loadchannelregs(cs);
1080: }
1081: }
1082:
1083: void
1084: tiocm_to_zs(struct zstty_softc *zst, u_long how, int ttybits)
1085: {
1086: struct zs_chanstate *cs = zst->zst_cs;
1087: u_char zsbits;
1088:
1089: zsbits = 0;
1090: if (ISSET(ttybits, TIOCM_DTR))
1091: SET(zsbits, ZSWR5_DTR);
1092: if (ISSET(ttybits, TIOCM_RTS))
1093: SET(zsbits, ZSWR5_RTS);
1094:
1095: switch (how) {
1096: case TIOCMBIC:
1097: CLR(cs->cs_preg[5], zsbits);
1098: break;
1099:
1100: case TIOCMBIS:
1101: SET(cs->cs_preg[5], zsbits);
1102: break;
1103:
1104: case TIOCMSET:
1105: CLR(cs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR);
1106: SET(cs->cs_preg[5], zsbits);
1107: break;
1108: }
1109:
1110: if (!cs->cs_heldchange) {
1111: if (zst->zst_tx_busy) {
1112: zst->zst_heldtbc = zst->zst_tbc;
1113: zst->zst_tbc = 0;
1114: cs->cs_heldchange = 1;
1115: } else
1116: zs_loadchannelregs(cs);
1117: }
1118: }
1119:
1120: int
1121: zs_to_tiocm(struct zstty_softc *zst)
1122: {
1123: struct zs_chanstate *cs = zst->zst_cs;
1124: u_char zsbits;
1125: int ttybits = 0;
1126:
1127: zsbits = cs->cs_preg[5];
1128: if (ISSET(zsbits, ZSWR5_DTR))
1129: SET(ttybits, TIOCM_DTR);
1130: if (ISSET(zsbits, ZSWR5_RTS))
1131: SET(ttybits, TIOCM_RTS);
1132:
1133: zsbits = cs->cs_rr0;
1134: if (ISSET(zsbits, ZSRR0_DCD))
1135: SET(ttybits, TIOCM_CD);
1136: if (ISSET(zsbits, ZSRR0_CTS))
1137: SET(ttybits, TIOCM_CTS);
1138:
1139: return (ttybits);
1140: }
1141:
1142: /*
1143: * Try to block or unblock input using hardware flow-control.
1144: * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and
1145: * if this function returns non-zero, the TS_TBLOCK flag will
1146: * be set or cleared according to the "block" arg passed.
1147: */
1148: int
1149: zshwiflow(struct tty *tp, int block)
1150: {
1151: struct zstty_softc *zst;
1152: struct zs_chanstate *cs;
1153: int s;
1154:
1155: zst = zstty_cd.cd_devs[minor(tp->t_dev)];
1156: cs = zst->zst_cs;
1157:
1158: if (cs->cs_wr5_rts == 0)
1159: return (0);
1160:
1161: s = splzs();
1162: if (block) {
1163: if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) {
1164: SET(zst->zst_rx_flags, RX_TTY_BLOCKED);
1165: zs_hwiflow(zst);
1166: }
1167: } else {
1168: if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) {
1169: CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED);
1170: zst->zst_rx_ready = 1;
1171: cs->cs_softreq = 1;
1172: }
1173: if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) {
1174: CLR(zst->zst_rx_flags, RX_TTY_BLOCKED);
1175: zs_hwiflow(zst);
1176: }
1177: }
1178: splx(s);
1179: return (1);
1180: }
1181:
1182: /*
1183: * Internal version of zshwiflow
1184: * called at splzs
1185: */
1186: void
1187: zs_hwiflow(struct zstty_softc *zst)
1188: {
1189: struct zs_chanstate *cs = zst->zst_cs;
1190:
1191: if (cs->cs_wr5_rts == 0)
1192: return;
1193:
1194: if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) {
1195: CLR(cs->cs_preg[5], cs->cs_wr5_rts);
1196: CLR(cs->cs_creg[5], cs->cs_wr5_rts);
1197: } else {
1198: SET(cs->cs_preg[5], cs->cs_wr5_rts);
1199: SET(cs->cs_creg[5], cs->cs_wr5_rts);
1200: }
1201: zs_write_reg(cs, 5, cs->cs_creg[5]);
1202: }
1203:
1204:
1205: /****************************************************************
1206: * Interface to the lower layer (zscc)
1207: ****************************************************************/
1208:
1209: void zstty_rxsoft(struct zstty_softc *, struct tty *);
1210: void zstty_txsoft(struct zstty_softc *, struct tty *);
1211: void zstty_stsoft(struct zstty_softc *, struct tty *);
1212:
1213: /*
1214: * receiver ready interrupt.
1215: * called at splzs
1216: */
1217: void
1218: zstty_rxint(struct zs_chanstate *cs)
1219: {
1220: struct zstty_softc *zst = cs->cs_private;
1221: u_char *put, *end;
1222: u_int cc;
1223: u_char rr0, rr1, c;
1224:
1225: end = zst->zst_ebuf;
1226: put = zst->zst_rbput;
1227: cc = zst->zst_rbavail;
1228:
1229: while (cc > 0) {
1230: /*
1231: * First read the status, because reading the received char
1232: * destroys the status of this char.
1233: */
1234: rr1 = zs_read_reg(cs, 1);
1235: c = zs_read_data(cs);
1236:
1237: if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) {
1238: /* Clear the receive error. */
1239: zs_write_csr(cs, ZSWR0_RESET_ERRORS);
1240: }
1241:
1242: put[0] = c;
1243: put[1] = rr1;
1244: put += 2;
1245: if (put >= end)
1246: put = zst->zst_rbuf;
1247: cc--;
1248:
1249: rr0 = zs_read_csr(cs);
1250: if (!ISSET(rr0, ZSRR0_RX_READY))
1251: break;
1252: }
1253:
1254: /*
1255: * Current string of incoming characters ended because
1256: * no more data was available or we ran out of space.
1257: * Schedule a receive event if any data was received.
1258: * If we're out of space, turn off receive interrupts.
1259: */
1260: zst->zst_rbput = put;
1261: zst->zst_rbavail = cc;
1262: if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) {
1263: zst->zst_rx_ready = 1;
1264: cs->cs_softreq = 1;
1265: }
1266:
1267: /*
1268: * See if we are in danger of overflowing a buffer. If
1269: * so, use hardware flow control to ease the pressure.
1270: */
1271: if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) &&
1272: cc < zst->zst_r_hiwat) {
1273: SET(zst->zst_rx_flags, RX_IBUF_BLOCKED);
1274: zs_hwiflow(zst);
1275: }
1276:
1277: /*
1278: * If we're out of space, disable receive interrupts
1279: * until the queue has drained a bit.
1280: */
1281: if (!cc) {
1282: SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED);
1283: CLR(cs->cs_preg[1], ZSWR1_RIE);
1284: cs->cs_creg[1] = cs->cs_preg[1];
1285: zs_write_reg(cs, 1, cs->cs_creg[1]);
1286: }
1287: }
1288:
1289: /*
1290: * transmitter ready interrupt. (splzs)
1291: */
1292: void
1293: zstty_txint(struct zs_chanstate *cs)
1294: {
1295: struct zstty_softc *zst = cs->cs_private;
1296:
1297: /*
1298: * If we've delayed a parameter change, do it now, and restart
1299: * output.
1300: */
1301: if (cs->cs_heldchange) {
1302: zs_loadchannelregs(cs);
1303: cs->cs_heldchange = 0;
1304: zst->zst_tbc = zst->zst_heldtbc;
1305: zst->zst_heldtbc = 0;
1306: }
1307:
1308: /* Output the next character in the buffer, if any. */
1309: if (zst->zst_tbc > 0) {
1310: zs_write_data(cs, *zst->zst_tba);
1311: zst->zst_tbc--;
1312: zst->zst_tba++;
1313: } else {
1314: /* Disable transmit completion interrupts if necessary. */
1315: if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) {
1316: CLR(cs->cs_preg[1], ZSWR1_TIE);
1317: cs->cs_creg[1] = cs->cs_preg[1];
1318: zs_write_reg(cs, 1, cs->cs_creg[1]);
1319: }
1320: if (zst->zst_tx_busy) {
1321: zst->zst_tx_busy = 0;
1322: zst->zst_tx_done = 1;
1323: cs->cs_softreq = 1;
1324: }
1325: }
1326: }
1327:
1328: #ifdef DDB
1329: #include <ddb/db_var.h>
1330: #define DB_CONSOLE db_console
1331: #else
1332: #define DB_CONSOLE 1
1333: #endif
1334:
1335: /*
1336: * status change interrupt. (splzs)
1337: */
1338: void
1339: zstty_stint(struct zs_chanstate *cs, int force)
1340: {
1341: struct zstty_softc *zst = cs->cs_private;
1342: u_char rr0, delta;
1343:
1344: rr0 = zs_read_csr(cs);
1345: zs_write_csr(cs, ZSWR0_RESET_STATUS);
1346:
1347: /*
1348: * Check here for console break, so that we can abort
1349: * even when interrupts are locking up the machine.
1350: */
1351: if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) &&
1352: ISSET(rr0, ZSRR0_BREAK) && DB_CONSOLE)
1353: zs_abort(cs);
1354:
1355: if (!force)
1356: delta = rr0 ^ cs->cs_rr0;
1357: else
1358: delta = cs->cs_rr0_mask;
1359: cs->cs_rr0 = rr0;
1360:
1361: if (ISSET(delta, cs->cs_rr0_mask)) {
1362: SET(cs->cs_rr0_delta, delta);
1363:
1364: /*
1365: * Stop output immediately if we lose the output
1366: * flow control signal or carrier detect.
1367: */
1368: if (ISSET(~rr0, cs->cs_rr0_mask)) {
1369: zst->zst_tbc = 0;
1370: zst->zst_heldtbc = 0;
1371: }
1372:
1373: zst->zst_st_check = 1;
1374: cs->cs_softreq = 1;
1375: }
1376: }
1377:
1378: void
1379: zstty_diag(void *arg)
1380: {
1381: struct zstty_softc *zst = arg;
1382: int overflows, floods;
1383: int s;
1384:
1385: s = splzs();
1386: overflows = zst->zst_overflows;
1387: zst->zst_overflows = 0;
1388: floods = zst->zst_floods;
1389: zst->zst_floods = 0;
1390: zst->zst_errors = 0;
1391: splx(s);
1392:
1393: log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n",
1394: zst->zst_dev.dv_xname,
1395: overflows, overflows == 1 ? "" : "s",
1396: floods, floods == 1 ? "" : "s");
1397: }
1398:
1399: void
1400: zstty_rxsoft(struct zstty_softc *zst, struct tty *tp)
1401: {
1402: struct zs_chanstate *cs = zst->zst_cs;
1403: int (*rint)(int c, struct tty *tp) = linesw[tp->t_line].l_rint;
1404: u_char *get, *end;
1405: u_int cc, scc;
1406: u_char rr1;
1407: int code;
1408: int s;
1409:
1410: end = zst->zst_ebuf;
1411: get = zst->zst_rbget;
1412: scc = cc = zstty_rbuf_size - zst->zst_rbavail;
1413:
1414: if (cc == zstty_rbuf_size) {
1415: zst->zst_floods++;
1416: if (zst->zst_errors++ == 0)
1417: timeout_add(&zst->zst_diag_ch, 60 * hz);
1418: }
1419:
1420: /* If not yet open, drop the entire buffer content here */
1421: if (!ISSET(tp->t_state, TS_ISOPEN)) {
1422: get += cc << 1;
1423: if (get >= end)
1424: get -= zstty_rbuf_size << 1;
1425: cc = 0;
1426: }
1427: while (cc) {
1428: code = get[0];
1429: rr1 = get[1];
1430: if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) {
1431: if (ISSET(rr1, ZSRR1_DO)) {
1432: zst->zst_overflows++;
1433: if (zst->zst_errors++ == 0)
1434: timeout_add(&zst->zst_diag_ch, 60 * hz);
1435: }
1436: if (ISSET(rr1, ZSRR1_FE))
1437: SET(code, TTY_FE);
1438: if (ISSET(rr1, ZSRR1_PE))
1439: SET(code, TTY_PE);
1440: }
1441: if ((*rint)(code, tp) == -1) {
1442: /*
1443: * The line discipline's buffer is out of space.
1444: */
1445: if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) {
1446: /*
1447: * We're either not using flow control, or the
1448: * line discipline didn't tell us to block for
1449: * some reason. Either way, we have no way to
1450: * know when there's more space available, so
1451: * just drop the rest of the data.
1452: */
1453: get += cc << 1;
1454: if (get >= end)
1455: get -= zstty_rbuf_size << 1;
1456: cc = 0;
1457: } else {
1458: /*
1459: * Don't schedule any more receive processing
1460: * until the line discipline tells us there's
1461: * space available (through comhwiflow()).
1462: * Leave the rest of the data in the input
1463: * buffer.
1464: */
1465: SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED);
1466: }
1467: break;
1468: }
1469: get += 2;
1470: if (get >= end)
1471: get = zst->zst_rbuf;
1472: cc--;
1473: }
1474:
1475: if (cc != scc) {
1476: zst->zst_rbget = get;
1477: s = splzs();
1478: cc = zst->zst_rbavail += scc - cc;
1479: /* Buffers should be ok again, release possible block. */
1480: if (cc >= zst->zst_r_lowat) {
1481: if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) {
1482: CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED);
1483: SET(cs->cs_preg[1], ZSWR1_RIE);
1484: cs->cs_creg[1] = cs->cs_preg[1];
1485: zs_write_reg(cs, 1, cs->cs_creg[1]);
1486: }
1487: if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) {
1488: CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED);
1489: zs_hwiflow(zst);
1490: }
1491: }
1492: splx(s);
1493: }
1494: }
1495:
1496: void
1497: zstty_txsoft(struct zstty_softc *zst, struct tty *tp)
1498: {
1499: CLR(tp->t_state, TS_BUSY);
1500: if (ISSET(tp->t_state, TS_FLUSH))
1501: CLR(tp->t_state, TS_FLUSH);
1502: else
1503: ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf));
1504: (*linesw[tp->t_line].l_start)(tp);
1505: }
1506:
1507: void
1508: zstty_stsoft(struct zstty_softc *zst, struct tty *tp)
1509: {
1510: struct zs_chanstate *cs = zst->zst_cs;
1511: u_char rr0, delta;
1512: int s;
1513:
1514: s = splzs();
1515: rr0 = cs->cs_rr0;
1516: delta = cs->cs_rr0_delta;
1517: cs->cs_rr0_delta = 0;
1518: splx(s);
1519:
1520: if (ISSET(delta, cs->cs_rr0_dcd)) {
1521: /*
1522: * Inform the tty layer that carrier detect changed.
1523: */
1524: (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(rr0, ZSRR0_DCD));
1525: }
1526:
1527: if (ISSET(delta, cs->cs_rr0_cts)) {
1528: /* Block or unblock output according to flow control. */
1529: if (ISSET(rr0, cs->cs_rr0_cts)) {
1530: zst->zst_tx_stopped = 0;
1531: (*linesw[tp->t_line].l_start)(tp);
1532: } else {
1533: zst->zst_tx_stopped = 1;
1534: }
1535: }
1536: }
1537:
1538: /*
1539: * Software interrupt. Called at zssoft
1540: *
1541: * The main job to be done here is to empty the input ring
1542: * by passing its contents up to the tty layer. The ring is
1543: * always emptied during this operation, therefore the ring
1544: * must not be larger than the space after "high water" in
1545: * the tty layer, or the tty layer might drop our input.
1546: *
1547: * Note: an "input blockage" condition is assumed to exist if
1548: * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set.
1549: */
1550: void
1551: zstty_softint(struct zs_chanstate *cs)
1552: {
1553: struct zstty_softc *zst = cs->cs_private;
1554: struct tty *tp = zst->zst_tty;
1555: int s;
1556:
1557: s = spltty();
1558:
1559: if (zst->zst_rx_ready) {
1560: zst->zst_rx_ready = 0;
1561: zstty_rxsoft(zst, tp);
1562: }
1563:
1564: if (zst->zst_st_check) {
1565: zst->zst_st_check = 0;
1566: zstty_stsoft(zst, tp);
1567: }
1568:
1569: if (zst->zst_tx_done) {
1570: zst->zst_tx_done = 0;
1571: zstty_txsoft(zst, tp);
1572: }
1573:
1574: splx(s);
1575: }
1576:
1577: struct zsops zsops_tty = {
1578: zstty_rxint, /* receive char available */
1579: zstty_stint, /* external/status */
1580: zstty_txint, /* xmit buffer empty */
1581: zstty_softint, /* process software interrupt */
1582: };