Annotation of sys/arch/sparc64/dev/z8530tty.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: z8530tty.c,v 1.13 2007/05/25 21:27:15 krw 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/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 <sparc64/dev/z8530reg.h>
112: #include <machine/z8530var.h>
113:
114: #include <dev/cons.h>
115:
116: /*
117: * How many input characters we can buffer.
118: * The port-specific var.h may override this.
119: * Note: must be a power of two!
120: */
121: #ifndef ZSTTY_RING_SIZE
122: #define ZSTTY_RING_SIZE 2048
123: #endif
124:
125: struct cfdriver zstty_cd = {
126: NULL, "zstty", DV_TTY
127: };
128:
129: /*
130: * Make this an option variable one can patch.
131: * But be warned: this must be a power of 2!
132: */
133: u_int zstty_rbuf_size = ZSTTY_RING_SIZE;
134:
135: /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */
136: u_int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE * 1) / 4;
137: u_int zstty_rbuf_lowat = (ZSTTY_RING_SIZE * 3) / 4;
138:
139: struct zstty_softc {
140: struct device zst_dev; /* required first: base device */
141: struct tty *zst_tty;
142: struct zs_chanstate *zst_cs;
143:
144: struct timeout zst_diag_ch;
145:
146: u_int zst_overflows,
147: zst_floods,
148: zst_errors;
149:
150: int zst_hwflags, /* see z8530var.h */
151: zst_swflags; /* TIOCFLAG_SOFTCAR, ... <ttycom.h> */
152:
153: u_int zst_r_hiwat,
154: zst_r_lowat;
155: u_char *volatile zst_rbget,
156: *volatile zst_rbput;
157: volatile u_int zst_rbavail;
158: u_char *zst_rbuf,
159: *zst_ebuf;
160:
161: /*
162: * The transmit byte count and address are used for pseudo-DMA
163: * output in the hardware interrupt code. PDMA can be suspended
164: * to get pending changes done; heldtbc is used for this. It can
165: * also be stopped for ^S; this sets TS_TTSTOP in tp->t_state.
166: */
167: u_char *zst_tba; /* transmit buffer address */
168: u_int zst_tbc, /* transmit byte count */
169: zst_heldtbc; /* held tbc while xmission stopped */
170:
171: /* Flags to communicate with zstty_softint() */
172: volatile u_char zst_rx_flags, /* receiver blocked */
173: #define RX_TTY_BLOCKED 0x01
174: #define RX_TTY_OVERFLOWED 0x02
175: #define RX_IBUF_BLOCKED 0x04
176: #define RX_IBUF_OVERFLOWED 0x08
177: #define RX_ANY_BLOCK 0x0f
178: zst_tx_busy, /* working on an output chunk */
179: zst_tx_done, /* done with one output chunk */
180: zst_tx_stopped, /* H/W level stop (lost CTS) */
181: zst_st_check, /* got a status interrupt */
182: zst_rx_ready;
183:
184: /* PPS signal on DCD, with or without inkernel clock disciplining */
185: u_char zst_ppsmask; /* pps signal mask */
186: u_char zst_ppsassert; /* pps leading edge */
187: u_char zst_ppsclear; /* pps trailing edge */
188: };
189:
190: /* Definition of the driver for autoconfig. */
191: static int zstty_match(struct device *, void *, void *);
192: static void zstty_attach(struct device *, struct device *, void *);
193:
194: struct cfattach zstty_ca = {
195: sizeof(struct zstty_softc), zstty_match, zstty_attach
196: };
197:
198: extern struct cfdriver zstty_cd;
199:
200: struct zsops zsops_tty;
201:
202: /* Routines called from other code. */
203: cdev_decl(zs); /* open, close, read, write, ioctl, stop, ... */
204:
205: static void zs_shutdown(struct zstty_softc *);
206: static void zsstart(struct tty *);
207: static int zsparam(struct tty *, struct termios *);
208: static void zs_modem(struct zstty_softc *, int);
209: static void tiocm_to_zs(struct zstty_softc *, u_long, int);
210: static int zs_to_tiocm(struct zstty_softc *);
211: static int zshwiflow(struct tty *, int);
212: static void zs_hwiflow(struct zstty_softc *);
213: static void zs_maskintr(struct zstty_softc *);
214:
215: struct zstty_softc *zs_device_lookup(struct cfdriver *, int);
216:
217: /* Low-level routines. */
218: static void zstty_rxint(struct zs_chanstate *);
219: static void zstty_stint(struct zs_chanstate *, int);
220: static void zstty_txint(struct zs_chanstate *);
221: static void zstty_softint(struct zs_chanstate *);
222: static void zstty_diag(void *);
223:
224:
225: #define ZSUNIT(x) (minor(x) & 0x7ffff)
226: #define ZSDIALOUT(x) (minor(x) & 0x80000)
227:
228: struct zstty_softc *
229: zs_device_lookup(cf, unit)
230: struct cfdriver *cf;
231: int unit;
232: {
233: return (struct zstty_softc *)device_lookup(cf, unit);
234: }
235:
236: /*
237: * zstty_match: how is this zs channel configured?
238: */
239: int
240: zstty_match(parent, vcf, aux)
241: struct device *parent;
242: void *vcf;
243: void *aux;
244: {
245: struct cfdata *cf = vcf;
246: struct zsc_attach_args *args = aux;
247:
248: /* Exact match is better than wildcard. */
249: if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel)
250: return 2;
251:
252: /* This driver accepts wildcard. */
253: if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT)
254: return 1;
255:
256: return 0;
257: }
258:
259: void
260: zstty_attach(parent, self, aux)
261: struct device *parent, *self;
262: void *aux;
263:
264: {
265: struct zsc_softc *zsc = (void *) parent;
266: struct zstty_softc *zst = (void *) self;
267: struct cfdata *cf = self->dv_cfdata;
268: struct zsc_attach_args *args = aux;
269: struct zs_chanstate *cs;
270: struct tty *tp;
271: int channel, s, tty_unit;
272: dev_t dev;
273: char *i, *o;
274:
275: timeout_set(&zst->zst_diag_ch, zstty_diag, zst);
276:
277: tty_unit = zst->zst_dev.dv_unit;
278: channel = args->channel;
279: cs = zsc->zsc_cs[channel];
280: cs->cs_private = zst;
281: cs->cs_ops = &zsops_tty;
282:
283: zst->zst_cs = cs;
284: zst->zst_swflags = cf->cf_flags; /* softcar, etc. */
285: zst->zst_hwflags = args->hwflags;
286: dev = makedev(zs_major, tty_unit);
287:
288: if (zst->zst_swflags)
289: printf(" flags 0x%x", zst->zst_swflags);
290:
291: /*
292: * Check whether we serve as a console device.
293: * XXX - split console input/output channels aren't
294: * supported yet on /dev/console
295: */
296: i = o = NULL;
297: if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) != 0) {
298: i = "input";
299: if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) {
300: args->consdev->cn_dev = dev;
301: cn_tab->cn_pollc = args->consdev->cn_pollc;
302: cn_tab->cn_getc = args->consdev->cn_getc;
303: }
304: cn_tab->cn_dev = dev;
305: /* Set console magic to BREAK */
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" : i) : o);
316:
317: #ifdef KGDB
318: if (zs_check_kgdb(cs, dev)) {
319: /*
320: * Allow kgdb to "take over" this port. Returns true
321: * if this serial port is in-use by kgdb.
322: */
323: printf(" (kgdb)\n");
324: /*
325: * This is the kgdb port (exclusive use)
326: * so skip the normal attach code.
327: */
328: return;
329: }
330: #endif
331:
332: if (strcmp(args->type, "keyboard") == 0 ||
333: strcmp(args->type, "mouse") == 0)
334: printf(": %s", args->type);
335:
336: printf("\n");
337:
338: tp = ttymalloc();
339: tp->t_dev = dev;
340: tp->t_oproc = zsstart;
341: tp->t_param = zsparam;
342: tp->t_hwiflow = zshwiflow;
343:
344: zst->zst_tty = tp;
345: zst->zst_rbuf = malloc(zstty_rbuf_size << 1, M_DEVBUF, M_WAITOK);
346: zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1);
347: /* Disable the high water mark. */
348: zst->zst_r_hiwat = 0;
349: zst->zst_r_lowat = 0;
350: zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf;
351: zst->zst_rbavail = zstty_rbuf_size;
352:
353: /* if there are no enable/disable functions, assume the device
354: is always enabled */
355: if (!cs->enable)
356: cs->enabled = 1;
357:
358: /*
359: * Hardware init
360: */
361: if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) {
362: /* Call zsparam similar to open. */
363: struct termios t;
364:
365: /* Wait a while for previous console output to complete */
366: DELAY(10000);
367:
368: /* Setup the "new" parameters in t. */
369: t.c_ispeed = 0;
370: t.c_ospeed = cs->cs_defspeed;
371: t.c_cflag = cs->cs_defcflag;
372:
373: s = splzs();
374:
375: /*
376: * Turn on receiver and status interrupts.
377: * We defer the actual write of the register to zsparam(),
378: * but we must make sure status interrupts are turned on by
379: * the time zsparam() reads the initial rr0 state.
380: */
381: SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE);
382:
383: splx(s);
384:
385: /* Make sure zsparam will see changes. */
386: tp->t_ospeed = 0;
387: (void) zsparam(tp, &t);
388:
389: s = splzs();
390:
391: /* Make sure DTR is on now. */
392: zs_modem(zst, 1);
393:
394: splx(s);
395: } else if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_NORESET)) {
396: /* Not the console; may need reset. */
397: int reset;
398:
399: reset = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET;
400:
401: s = splzs();
402:
403: zs_write_reg(cs, 9, reset);
404:
405: /* Will raise DTR in open. */
406: zs_modem(zst, 0);
407:
408: splx(s);
409: }
410: }
411:
412:
413: /*
414: * Return pointer to our tty.
415: */
416: struct tty *
417: zstty(dev)
418: dev_t dev;
419: {
420: struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(dev));
421:
422: return (zst->zst_tty);
423: }
424:
425:
426: void
427: zs_shutdown(zst)
428: struct zstty_softc *zst;
429: {
430: struct zs_chanstate *cs = zst->zst_cs;
431: struct tty *tp = zst->zst_tty;
432: int s;
433:
434: s = splzs();
435:
436: /* If we were asserting flow control, then deassert it. */
437: SET(zst->zst_rx_flags, RX_IBUF_BLOCKED);
438: zs_hwiflow(zst);
439:
440: /* Clear any break condition set with TIOCSBRK. */
441: zs_break(cs, 0);
442:
443: /* Turn off PPS capture on last close. */
444: zst->zst_ppsmask = 0;
445:
446: /*
447: * Hang up if necessary. Wait a bit, so the other side has time to
448: * notice even if we immediately open the port again.
449: */
450: if (ISSET(tp->t_cflag, HUPCL)) {
451: zs_modem(zst, 0);
452: (void) tsleep(cs, TTIPRI, ttclos, hz);
453: }
454:
455: /* Turn off interrupts if not the console. */
456: if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) {
457: CLR(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE);
458: cs->cs_creg[1] = cs->cs_preg[1];
459: zs_write_reg(cs, 1, cs->cs_creg[1]);
460: }
461:
462: /* Call the power management hook. */
463: if (cs->disable) {
464: #ifdef DIAGNOSTIC
465: if (!cs->enabled)
466: panic("zs_shutdown: not enabled?");
467: #endif
468: (*cs->disable)(zst->zst_cs);
469: }
470:
471: splx(s);
472: }
473:
474: /*
475: * Open a zs serial (tty) port.
476: */
477: int
478: zsopen(dev, flags, mode, p)
479: dev_t dev;
480: int flags;
481: int mode;
482: struct proc *p;
483: {
484: struct zstty_softc *zst;
485: struct zs_chanstate *cs;
486: struct tty *tp;
487: int s, s2;
488: int error;
489:
490: zst = zs_device_lookup(&zstty_cd, ZSUNIT(dev));
491: if (zst == NULL)
492: return (ENXIO);
493:
494: tp = zst->zst_tty;
495: cs = zst->zst_cs;
496:
497: /* If KGDB took the line, then tp==NULL */
498: if (tp == NULL)
499: return (EBUSY);
500:
501: if (ISSET(tp->t_state, TS_ISOPEN) &&
502: ISSET(tp->t_state, TS_XCLUDE) &&
503: p->p_ucred->cr_uid != 0)
504: return (EBUSY);
505:
506: s = spltty();
507:
508: /*
509: * Do the following iff this is a first open.
510: */
511: if (!ISSET(tp->t_state, TS_ISOPEN)) {
512: struct termios t;
513:
514: tp->t_dev = dev;
515:
516: /* Call the power management hook. */
517: if (cs->enable) {
518: if ((*cs->enable)(cs)) {
519: splx(s);
520: printf("%s: device enable failed\n",
521: zst->zst_dev.dv_xname);
522: return (EIO);
523: }
524: }
525:
526: /*
527: * Initialize the termios status to the defaults. Add in the
528: * sticky bits from TIOCSFLAGS.
529: */
530: t.c_ispeed = 0;
531: t.c_ospeed = cs->cs_defspeed;
532: t.c_cflag = cs->cs_defcflag;
533: if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL))
534: SET(t.c_cflag, CLOCAL);
535: if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS))
536: SET(t.c_cflag, CRTSCTS);
537: if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF))
538: SET(t.c_cflag, MDMBUF);
539:
540: s2 = splzs();
541:
542: /*
543: * Turn on receiver and status interrupts.
544: * We defer the actual write of the register to zsparam(),
545: * but we must make sure status interrupts are turned on by
546: * the time zsparam() reads the initial rr0 state.
547: */
548: SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE);
549:
550: /* Clear PPS capture state on first open. */
551: zst->zst_ppsmask = 0;
552:
553: splx(s2);
554:
555: /* Make sure zsparam will see changes. */
556: tp->t_ospeed = 0;
557: (void) zsparam(tp, &t);
558:
559: /*
560: * Note: zsparam has done: cflag, ispeed, ospeed
561: * so we just need to do: iflag, oflag, lflag, cc
562: * For "raw" mode, just leave all zeros.
563: */
564: if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) {
565: tp->t_iflag = TTYDEF_IFLAG;
566: tp->t_oflag = TTYDEF_OFLAG;
567: tp->t_lflag = TTYDEF_LFLAG;
568: } else {
569: tp->t_iflag = 0;
570: tp->t_oflag = 0;
571: tp->t_lflag = 0;
572: }
573: ttychars(tp);
574: ttsetwater(tp);
575:
576: s2 = splzs();
577:
578: /*
579: * Turn on DTR. We must always do this, even if carrier is not
580: * present, because otherwise we'd have to use TIOCSDTR
581: * immediately after setting CLOCAL, which applications do not
582: * expect. We always assert DTR while the device is open
583: * unless explicitly requested to deassert it.
584: */
585: zs_modem(zst, 1);
586:
587: /* Clear the input ring, and unblock. */
588: zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf;
589: zst->zst_rbavail = zstty_rbuf_size;
590: zs_iflush(cs);
591: CLR(zst->zst_rx_flags, RX_ANY_BLOCK);
592: zs_hwiflow(zst);
593:
594: splx(s2);
595: }
596:
597: splx(s);
598:
599: error = ((*linesw[tp->t_line].l_open)(dev, tp));
600: if (error)
601: goto bad;
602:
603: return (0);
604:
605: bad:
606: if (!ISSET(tp->t_state, TS_ISOPEN)) {
607: /*
608: * We failed to open the device, and nobody else had it opened.
609: * Clean up the state as appropriate.
610: */
611: zs_shutdown(zst);
612: }
613:
614: return (error);
615: }
616:
617: /*
618: * Close a zs serial port.
619: */
620: int
621: zsclose(dev, flags, mode, p)
622: dev_t dev;
623: int flags;
624: int mode;
625: struct proc *p;
626: {
627: struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(dev));
628: struct tty *tp = zst->zst_tty;
629:
630: /* XXX This is for cons.c. */
631: if (!ISSET(tp->t_state, TS_ISOPEN))
632: return 0;
633:
634: (*linesw[tp->t_line].l_close)(tp, flags);
635: ttyclose(tp);
636:
637: if (!ISSET(tp->t_state, TS_ISOPEN)) {
638: /*
639: * Although we got a last close, the device may still be in
640: * use; e.g. if this was the dialout node, and there are still
641: * processes waiting for carrier on the non-dialout node.
642: */
643: zs_shutdown(zst);
644: }
645:
646: return (0);
647: }
648:
649: /*
650: * Read/write zs serial port.
651: */
652: int
653: zsread(dev, uio, flags)
654: dev_t dev;
655: struct uio *uio;
656: int flags;
657: {
658: struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(dev));
659: struct tty *tp = zst->zst_tty;
660:
661: return (*linesw[tp->t_line].l_read)(tp, uio, flags);
662: }
663:
664: int
665: zswrite(dev, uio, flags)
666: dev_t dev;
667: struct uio *uio;
668: int flags;
669: {
670: struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(dev));
671: struct tty *tp = zst->zst_tty;
672:
673: return ((*linesw[tp->t_line].l_write)(tp, uio, flags));
674: }
675:
676: int
677: zsioctl(dev, cmd, data, flag, p)
678: dev_t dev;
679: u_long cmd;
680: caddr_t data;
681: int flag;
682: struct proc *p;
683: {
684: struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(dev));
685: struct zs_chanstate *cs = zst->zst_cs;
686: struct tty *tp = zst->zst_tty;
687: int error;
688: int s;
689:
690: error = ((*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p));
691: if (error >= 0)
692: return (error);
693:
694: error = ttioctl(tp, cmd, data, flag, p);
695: if (error >= 0)
696: return (error);
697:
698: #ifdef ZS_MD_IOCTL
699: error = ZS_MD_IOCTL;
700: if (error >= 0)
701: return (error);
702: #endif /* ZS_MD_IOCTL */
703:
704: error = 0;
705:
706: s = splzs();
707:
708: switch (cmd) {
709: case TIOCSBRK:
710: zs_break(cs, 1);
711: break;
712:
713: case TIOCCBRK:
714: zs_break(cs, 0);
715: break;
716:
717: case TIOCGFLAGS:
718: *(int *)data = zst->zst_swflags;
719: break;
720:
721: case TIOCSFLAGS:
722: error = suser(p, 0);
723: if (error)
724: break;
725: zst->zst_swflags = *(int *)data;
726: break;
727:
728: case TIOCSDTR:
729: zs_modem(zst, 1);
730: break;
731:
732: case TIOCCDTR:
733: zs_modem(zst, 0);
734: break;
735:
736: case TIOCMSET:
737: case TIOCMBIS:
738: case TIOCMBIC:
739: tiocm_to_zs(zst, cmd, *(int *)data);
740: break;
741:
742: case TIOCMGET:
743: *(int *)data = zs_to_tiocm(zst);
744: break;
745:
746: default:
747: error = ENOTTY;
748: break;
749: }
750:
751: splx(s);
752:
753: return (error);
754: }
755:
756: /*
757: * Start or restart transmission.
758: */
759: static void
760: zsstart(tp)
761: struct tty *tp;
762: {
763: struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(tp->t_dev));
764: struct zs_chanstate *cs = zst->zst_cs;
765: int s;
766:
767: s = spltty();
768: if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP))
769: goto out;
770: if (zst->zst_tx_stopped)
771: goto out;
772:
773: if (tp->t_outq.c_cc <= tp->t_lowat) {
774: if (ISSET(tp->t_state, TS_ASLEEP)) {
775: CLR(tp->t_state, TS_ASLEEP);
776: wakeup((caddr_t)&tp->t_outq);
777: }
778: selwakeup(&tp->t_wsel);
779: if (tp->t_outq.c_cc == 0)
780: goto out;
781: }
782:
783: /* Grab the first contiguous region of buffer space. */
784: {
785: u_char *tba;
786: int tbc;
787:
788: tba = tp->t_outq.c_cf;
789: tbc = ndqb(&tp->t_outq, 0);
790:
791: (void) splzs();
792:
793: zst->zst_tba = tba;
794: zst->zst_tbc = tbc;
795: }
796:
797: SET(tp->t_state, TS_BUSY);
798: zst->zst_tx_busy = 1;
799:
800: /* Enable transmit completion interrupts if necessary. */
801: if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) {
802: SET(cs->cs_preg[1], ZSWR1_TIE);
803: cs->cs_creg[1] = cs->cs_preg[1];
804: zs_write_reg(cs, 1, cs->cs_creg[1]);
805: }
806:
807: /* Output the first character of the contiguous buffer. */
808: {
809: zs_write_data(cs, *zst->zst_tba);
810: zst->zst_tbc--;
811: zst->zst_tba++;
812: }
813: out:
814: splx(s);
815: return;
816: }
817:
818: /*
819: * Stop output, e.g., for ^S or output flush.
820: */
821: int
822: zsstop(tp, flag)
823: struct tty *tp;
824: int flag;
825: {
826: struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(tp->t_dev));
827: int s;
828:
829: s = splzs();
830: if (ISSET(tp->t_state, TS_BUSY)) {
831: /* Stop transmitting at the next chunk. */
832: zst->zst_tbc = 0;
833: zst->zst_heldtbc = 0;
834: if (!ISSET(tp->t_state, TS_TTSTOP))
835: SET(tp->t_state, TS_FLUSH);
836: }
837: splx(s);
838: return (0);
839: }
840:
841: /*
842: * Set ZS tty parameters from termios.
843: * XXX - Should just copy the whole termios after
844: * making sure all the changes could be done.
845: */
846: static int
847: zsparam(tp, t)
848: struct tty *tp;
849: struct termios *t;
850: {
851: struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(tp->t_dev));
852: struct zs_chanstate *cs = zst->zst_cs;
853: int ospeed, cflag;
854: u_char tmp3, tmp4, tmp5;
855: int s, error;
856:
857: ospeed = t->c_ospeed;
858: cflag = t->c_cflag;
859:
860: /* Check requested parameters. */
861: if (ospeed < 0)
862: return (EINVAL);
863: if (t->c_ispeed && t->c_ispeed != ospeed)
864: return (EINVAL);
865:
866: /*
867: * For the console, always force CLOCAL and !HUPCL, so that the port
868: * is always active.
869: */
870: if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) ||
871: ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) {
872: SET(cflag, CLOCAL);
873: CLR(cflag, HUPCL);
874: }
875:
876: /*
877: * Only whack the UART when params change.
878: * Some callers need to clear tp->t_ospeed
879: * to make sure initialization gets done.
880: */
881: if (tp->t_ospeed == ospeed &&
882: tp->t_cflag == cflag)
883: return (0);
884:
885: /*
886: * Call MD functions to deal with changed
887: * clock modes or H/W flow control modes.
888: * The BRG divisor is set now. (reg 12,13)
889: */
890: error = zs_set_speed(cs, ospeed);
891: if (error)
892: return (error);
893: error = zs_set_modes(cs, cflag);
894: if (error)
895: return (error);
896:
897: /*
898: * Block interrupts so that state will not
899: * be altered until we are done setting it up.
900: *
901: * Initial values in cs_preg are set before
902: * our attach routine is called. The master
903: * interrupt enable is handled by zsc.c
904: *
905: */
906: s = splzs();
907:
908: /*
909: * Recalculate which status ints to enable.
910: */
911: zs_maskintr(zst);
912:
913: /* Recompute character size bits. */
914: tmp3 = cs->cs_preg[3];
915: tmp5 = cs->cs_preg[5];
916: CLR(tmp3, ZSWR3_RXSIZE);
917: CLR(tmp5, ZSWR5_TXSIZE);
918: switch (ISSET(cflag, CSIZE)) {
919: case CS5:
920: SET(tmp3, ZSWR3_RX_5);
921: SET(tmp5, ZSWR5_TX_5);
922: break;
923: case CS6:
924: SET(tmp3, ZSWR3_RX_6);
925: SET(tmp5, ZSWR5_TX_6);
926: break;
927: case CS7:
928: SET(tmp3, ZSWR3_RX_7);
929: SET(tmp5, ZSWR5_TX_7);
930: break;
931: case CS8:
932: SET(tmp3, ZSWR3_RX_8);
933: SET(tmp5, ZSWR5_TX_8);
934: break;
935: }
936: cs->cs_preg[3] = tmp3;
937: cs->cs_preg[5] = tmp5;
938:
939: /*
940: * Recompute the stop bits and parity bits. Note that
941: * zs_set_speed() may have set clock selection bits etc.
942: * in wr4, so those must preserved.
943: */
944: tmp4 = cs->cs_preg[4];
945: CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK);
946: if (ISSET(cflag, CSTOPB))
947: SET(tmp4, ZSWR4_TWOSB);
948: else
949: SET(tmp4, ZSWR4_ONESB);
950: if (!ISSET(cflag, PARODD))
951: SET(tmp4, ZSWR4_EVENP);
952: if (ISSET(cflag, PARENB))
953: SET(tmp4, ZSWR4_PARENB);
954: cs->cs_preg[4] = tmp4;
955:
956: /* And copy to tty. */
957: tp->t_ispeed = 0;
958: tp->t_ospeed = ospeed;
959: tp->t_cflag = cflag;
960:
961: /*
962: * If nothing is being transmitted, set up new current values,
963: * else mark them as pending.
964: */
965: if (!cs->cs_heldchange) {
966: if (zst->zst_tx_busy) {
967: zst->zst_heldtbc = zst->zst_tbc;
968: zst->zst_tbc = 0;
969: cs->cs_heldchange = 1;
970: } else
971: zs_loadchannelregs(cs);
972: }
973:
974: /*
975: * If hardware flow control is disabled, turn off the buffer water
976: * marks and unblock any soft flow control state. Otherwise, enable
977: * the water marks.
978: */
979: if (!ISSET(cflag, CHWFLOW)) {
980: zst->zst_r_hiwat = 0;
981: zst->zst_r_lowat = 0;
982: if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) {
983: CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED);
984: zst->zst_rx_ready = 1;
985: cs->cs_softreq = 1;
986: }
987: if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) {
988: CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED);
989: zs_hwiflow(zst);
990: }
991: } else {
992: zst->zst_r_hiwat = zstty_rbuf_hiwat;
993: zst->zst_r_lowat = zstty_rbuf_lowat;
994: }
995:
996: /*
997: * Force a recheck of the hardware carrier and flow control status,
998: * since we may have changed which bits we're looking at.
999: */
1000: zstty_stint(cs, 1);
1001:
1002: splx(s);
1003:
1004: /*
1005: * If hardware flow control is disabled, unblock any hard flow control
1006: * state.
1007: */
1008: if (!ISSET(cflag, CHWFLOW)) {
1009: if (zst->zst_tx_stopped) {
1010: zst->zst_tx_stopped = 0;
1011: zsstart(tp);
1012: }
1013: }
1014:
1015: zstty_softint(cs);
1016:
1017: return (0);
1018: }
1019:
1020: /*
1021: * Compute interrupt enable bits and set in the pending bits. Called both
1022: * in zsparam() and when PPS (pulse per second timing) state changes.
1023: * Must be called at splzs().
1024: */
1025: static void
1026: zs_maskintr(zst)
1027: struct zstty_softc *zst;
1028: {
1029: struct zs_chanstate *cs = zst->zst_cs;
1030: int tmp15;
1031:
1032: cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd;
1033: if (zst->zst_ppsmask != 0)
1034: cs->cs_rr0_mask |= cs->cs_rr0_pps;
1035: tmp15 = cs->cs_preg[15];
1036: if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD))
1037: SET(tmp15, ZSWR15_DCD_IE);
1038: else
1039: CLR(tmp15, ZSWR15_DCD_IE);
1040: if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS))
1041: SET(tmp15, ZSWR15_CTS_IE);
1042: else
1043: CLR(tmp15, ZSWR15_CTS_IE);
1044: cs->cs_preg[15] = tmp15;
1045: }
1046:
1047:
1048: /*
1049: * Raise or lower modem control (DTR/RTS) signals. If a character is
1050: * in transmission, the change is deferred.
1051: */
1052: static void
1053: zs_modem(zst, onoff)
1054: struct zstty_softc *zst;
1055: int onoff;
1056: {
1057: struct zs_chanstate *cs = zst->zst_cs;
1058:
1059: if (cs->cs_wr5_dtr == 0)
1060: return;
1061:
1062: if (onoff)
1063: SET(cs->cs_preg[5], cs->cs_wr5_dtr);
1064: else
1065: CLR(cs->cs_preg[5], cs->cs_wr5_dtr);
1066:
1067: if (!cs->cs_heldchange) {
1068: if (zst->zst_tx_busy) {
1069: zst->zst_heldtbc = zst->zst_tbc;
1070: zst->zst_tbc = 0;
1071: cs->cs_heldchange = 1;
1072: } else
1073: zs_loadchannelregs(cs);
1074: }
1075: }
1076:
1077: static void
1078: tiocm_to_zs(zst, how, ttybits)
1079: struct zstty_softc *zst;
1080: u_long how;
1081: int ttybits;
1082: {
1083: struct zs_chanstate *cs = zst->zst_cs;
1084: u_char zsbits;
1085:
1086: zsbits = 0;
1087: if (ISSET(ttybits, TIOCM_DTR))
1088: SET(zsbits, ZSWR5_DTR);
1089: if (ISSET(ttybits, TIOCM_RTS))
1090: SET(zsbits, ZSWR5_RTS);
1091:
1092: switch (how) {
1093: case TIOCMBIC:
1094: CLR(cs->cs_preg[5], zsbits);
1095: break;
1096:
1097: case TIOCMBIS:
1098: SET(cs->cs_preg[5], zsbits);
1099: break;
1100:
1101: case TIOCMSET:
1102: CLR(cs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR);
1103: SET(cs->cs_preg[5], zsbits);
1104: break;
1105: }
1106:
1107: if (!cs->cs_heldchange) {
1108: if (zst->zst_tx_busy) {
1109: zst->zst_heldtbc = zst->zst_tbc;
1110: zst->zst_tbc = 0;
1111: cs->cs_heldchange = 1;
1112: } else
1113: zs_loadchannelregs(cs);
1114: }
1115: }
1116:
1117: static int
1118: zs_to_tiocm(zst)
1119: struct zstty_softc *zst;
1120: {
1121: struct zs_chanstate *cs = zst->zst_cs;
1122: u_char zsbits;
1123: int ttybits = 0;
1124:
1125: zsbits = cs->cs_preg[5];
1126: if (ISSET(zsbits, ZSWR5_DTR))
1127: SET(ttybits, TIOCM_DTR);
1128: if (ISSET(zsbits, ZSWR5_RTS))
1129: SET(ttybits, TIOCM_RTS);
1130:
1131: zsbits = cs->cs_rr0;
1132: if (ISSET(zsbits, ZSRR0_DCD))
1133: SET(ttybits, TIOCM_CD);
1134: if (ISSET(zsbits, ZSRR0_CTS))
1135: SET(ttybits, TIOCM_CTS);
1136:
1137: return (ttybits);
1138: }
1139:
1140: /*
1141: * Try to block or unblock input using hardware flow-control.
1142: * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and
1143: * if this function returns non-zero, the TS_TBLOCK flag will
1144: * be set or cleared according to the "block" arg passed.
1145: */
1146: int
1147: zshwiflow(tp, block)
1148: struct tty *tp;
1149: int block;
1150: {
1151: struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(tp->t_dev));
1152: struct zs_chanstate *cs = zst->zst_cs;
1153: int s;
1154:
1155: if (cs->cs_wr5_rts == 0)
1156: return (0);
1157:
1158: s = splzs();
1159: if (block) {
1160: if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) {
1161: SET(zst->zst_rx_flags, RX_TTY_BLOCKED);
1162: zs_hwiflow(zst);
1163: }
1164: } else {
1165: if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) {
1166: CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED);
1167: zst->zst_rx_ready = 1;
1168: cs->cs_softreq = 1;
1169: }
1170: if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) {
1171: CLR(zst->zst_rx_flags, RX_TTY_BLOCKED);
1172: zs_hwiflow(zst);
1173: }
1174: }
1175: splx(s);
1176: return (1);
1177: }
1178:
1179: /*
1180: * Internal version of zshwiflow
1181: * called at splzs
1182: */
1183: static void
1184: zs_hwiflow(zst)
1185: struct zstty_softc *zst;
1186: {
1187: struct zs_chanstate *cs = zst->zst_cs;
1188:
1189: if (cs->cs_wr5_rts == 0)
1190: return;
1191:
1192: if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) {
1193: CLR(cs->cs_preg[5], cs->cs_wr5_rts);
1194: CLR(cs->cs_creg[5], cs->cs_wr5_rts);
1195: } else {
1196: SET(cs->cs_preg[5], cs->cs_wr5_rts);
1197: SET(cs->cs_creg[5], cs->cs_wr5_rts);
1198: }
1199: zs_write_reg(cs, 5, cs->cs_creg[5]);
1200: }
1201:
1202:
1203: /****************************************************************
1204: * Interface to the lower layer (zscc)
1205: ****************************************************************/
1206:
1207: #define integrate static inline
1208: integrate void zstty_rxsoft(struct zstty_softc *, struct tty *);
1209: integrate void zstty_txsoft(struct zstty_softc *, struct tty *);
1210: integrate void zstty_stsoft(struct zstty_softc *, struct tty *);
1211: /*
1212: * receiver ready interrupt.
1213: * called at splzs
1214: */
1215: static void
1216: zstty_rxint(cs)
1217: struct zs_chanstate *cs;
1218: {
1219: struct zstty_softc *zst = cs->cs_private;
1220: u_char *put, *end;
1221: u_int cc;
1222: u_char rr0, rr1, c;
1223:
1224: end = zst->zst_ebuf;
1225: put = zst->zst_rbput;
1226: cc = zst->zst_rbavail;
1227:
1228: while (cc > 0) {
1229: /*
1230: * First read the status, because reading the received char
1231: * destroys the status of this char.
1232: */
1233: rr1 = zs_read_reg(cs, 1);
1234: c = zs_read_data(cs);
1235:
1236: if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) {
1237: /* Clear the receive error. */
1238: zs_write_csr(cs, ZSWR0_RESET_ERRORS);
1239: }
1240:
1241: put[0] = c;
1242: put[1] = rr1;
1243: put += 2;
1244: if (put >= end)
1245: put = zst->zst_rbuf;
1246: cc--;
1247:
1248: rr0 = zs_read_csr(cs);
1249: if (!ISSET(rr0, ZSRR0_RX_READY))
1250: break;
1251: }
1252:
1253: /*
1254: * Current string of incoming characters ended because
1255: * no more data was available or we ran out of space.
1256: * Schedule a receive event if any data was received.
1257: * If we're out of space, turn off receive interrupts.
1258: */
1259: zst->zst_rbput = put;
1260: zst->zst_rbavail = cc;
1261: if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) {
1262: zst->zst_rx_ready = 1;
1263: cs->cs_softreq = 1;
1264: }
1265:
1266: /*
1267: * See if we are in danger of overflowing a buffer. If
1268: * so, use hardware flow control to ease the pressure.
1269: */
1270: if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) &&
1271: cc < zst->zst_r_hiwat) {
1272: SET(zst->zst_rx_flags, RX_IBUF_BLOCKED);
1273: zs_hwiflow(zst);
1274: }
1275:
1276: /*
1277: * If we're out of space, disable receive interrupts
1278: * until the queue has drained a bit.
1279: */
1280: if (!cc) {
1281: SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED);
1282: CLR(cs->cs_preg[1], ZSWR1_RIE);
1283: cs->cs_creg[1] = cs->cs_preg[1];
1284: zs_write_reg(cs, 1, cs->cs_creg[1]);
1285: }
1286: }
1287:
1288: /*
1289: * transmitter ready interrupt. (splzs)
1290: */
1291: static void
1292: zstty_txint(cs)
1293: 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: static void
1339: zstty_stint(cs, force)
1340: struct zs_chanstate *cs;
1341: int force;
1342: {
1343: struct zstty_softc *zst = cs->cs_private;
1344: struct tty *tp = zst->zst_tty;
1345: u_char rr0, delta;
1346:
1347: rr0 = zs_read_csr(cs);
1348: zs_write_csr(cs, ZSWR0_RESET_STATUS);
1349:
1350: /*
1351: * Check here for console break, so that we can abort
1352: * even when interrupts are locking up the machine.
1353: */
1354: if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) &&
1355: ISSET(rr0, ZSRR0_BREAK) && DB_CONSOLE)
1356: zs_abort(cs);
1357:
1358: if (!force)
1359: delta = rr0 ^ cs->cs_rr0;
1360: else
1361: delta = cs->cs_rr0_mask;
1362:
1363: ttytstamp(tp, cs->cs_rr0 & ZSRR0_CTS, rr0 & ZSRR0_CTS,
1364: cs->cs_rr0 & ZSRR0_DCD, rr0 & ZSRR0_DCD);
1365:
1366: cs->cs_rr0 = rr0;
1367:
1368: if (ISSET(delta, cs->cs_rr0_mask)) {
1369: SET(cs->cs_rr0_delta, delta);
1370:
1371: /*
1372: * Stop output immediately if we lose the output
1373: * flow control signal or carrier detect.
1374: */
1375: if (ISSET(~rr0, cs->cs_rr0_mask)) {
1376: zst->zst_tbc = 0;
1377: zst->zst_heldtbc = 0;
1378: }
1379:
1380: zst->zst_st_check = 1;
1381: cs->cs_softreq = 1;
1382: }
1383: }
1384:
1385: void
1386: zstty_diag(arg)
1387: void *arg;
1388: {
1389: struct zstty_softc *zst = arg;
1390: int overflows, floods;
1391: int s;
1392:
1393: s = splzs();
1394: overflows = zst->zst_overflows;
1395: zst->zst_overflows = 0;
1396: floods = zst->zst_floods;
1397: zst->zst_floods = 0;
1398: zst->zst_errors = 0;
1399: splx(s);
1400:
1401: log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n",
1402: zst->zst_dev.dv_xname,
1403: overflows, overflows == 1 ? "" : "s",
1404: floods, floods == 1 ? "" : "s");
1405: }
1406:
1407: integrate void
1408: zstty_rxsoft(zst, tp)
1409: struct zstty_softc *zst;
1410: struct tty *tp;
1411: {
1412: struct zs_chanstate *cs = zst->zst_cs;
1413: int (*rint)(int c, struct tty *tp) = linesw[tp->t_line].l_rint;
1414: u_char *get, *end;
1415: u_int cc, scc;
1416: u_char rr1;
1417: int code;
1418: int s;
1419:
1420: end = zst->zst_ebuf;
1421: get = zst->zst_rbget;
1422: scc = cc = zstty_rbuf_size - zst->zst_rbavail;
1423:
1424: if (cc == zstty_rbuf_size) {
1425: zst->zst_floods++;
1426: if (zst->zst_errors++ == 0)
1427: timeout_add(&zst->zst_diag_ch, 60 * hz);
1428: }
1429:
1430: /* If not yet open, drop the entire buffer content here */
1431: if (!ISSET(tp->t_state, TS_ISOPEN)) {
1432: get += cc << 1;
1433: if (get >= end)
1434: get -= zstty_rbuf_size << 1;
1435: cc = 0;
1436: }
1437: while (cc) {
1438: code = get[0];
1439: rr1 = get[1];
1440: if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) {
1441: if (ISSET(rr1, ZSRR1_DO)) {
1442: zst->zst_overflows++;
1443: if (zst->zst_errors++ == 0)
1444: timeout_add(&zst->zst_diag_ch, 60 * hz);
1445: }
1446: if (ISSET(rr1, ZSRR1_FE))
1447: SET(code, TTY_FE);
1448: if (ISSET(rr1, ZSRR1_PE))
1449: SET(code, TTY_PE);
1450: }
1451: if ((*rint)(code, tp) == -1) {
1452: /*
1453: * The line discipline's buffer is out of space.
1454: */
1455: if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) {
1456: /*
1457: * We're either not using flow control, or the
1458: * line discipline didn't tell us to block for
1459: * some reason. Either way, we have no way to
1460: * know when there's more space available, so
1461: * just drop the rest of the data.
1462: */
1463: get += cc << 1;
1464: if (get >= end)
1465: get -= zstty_rbuf_size << 1;
1466: cc = 0;
1467: } else {
1468: /*
1469: * Don't schedule any more receive processing
1470: * until the line discipline tells us there's
1471: * space available (through comhwiflow()).
1472: * Leave the rest of the data in the input
1473: * buffer.
1474: */
1475: SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED);
1476: }
1477: break;
1478: }
1479: get += 2;
1480: if (get >= end)
1481: get = zst->zst_rbuf;
1482: cc--;
1483: }
1484:
1485: if (cc != scc) {
1486: zst->zst_rbget = get;
1487: s = splzs();
1488: cc = zst->zst_rbavail += scc - cc;
1489: /* Buffers should be ok again, release possible block. */
1490: if (cc >= zst->zst_r_lowat) {
1491: if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) {
1492: CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED);
1493: SET(cs->cs_preg[1], ZSWR1_RIE);
1494: cs->cs_creg[1] = cs->cs_preg[1];
1495: zs_write_reg(cs, 1, cs->cs_creg[1]);
1496: }
1497: if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) {
1498: CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED);
1499: zs_hwiflow(zst);
1500: }
1501: }
1502: splx(s);
1503: }
1504: }
1505:
1506: integrate void
1507: zstty_txsoft(zst, tp)
1508: struct zstty_softc *zst;
1509: struct tty *tp;
1510: {
1511:
1512: CLR(tp->t_state, TS_BUSY);
1513: if (ISSET(tp->t_state, TS_FLUSH))
1514: CLR(tp->t_state, TS_FLUSH);
1515: else
1516: ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf));
1517: (*linesw[tp->t_line].l_start)(tp);
1518: }
1519:
1520: integrate void
1521: zstty_stsoft(zst, tp)
1522: struct zstty_softc *zst;
1523: struct tty *tp;
1524: {
1525: struct zs_chanstate *cs = zst->zst_cs;
1526: u_char rr0, delta;
1527: int s;
1528:
1529: s = splzs();
1530: rr0 = cs->cs_rr0;
1531: delta = cs->cs_rr0_delta;
1532: cs->cs_rr0_delta = 0;
1533: splx(s);
1534:
1535: if (ISSET(delta, cs->cs_rr0_dcd)) {
1536: /*
1537: * Inform the tty layer that carrier detect changed.
1538: */
1539: (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(rr0, ZSRR0_DCD));
1540: }
1541:
1542: if (ISSET(delta, cs->cs_rr0_cts)) {
1543: /* Block or unblock output according to flow control. */
1544: if (ISSET(rr0, cs->cs_rr0_cts)) {
1545: zst->zst_tx_stopped = 0;
1546: (*linesw[tp->t_line].l_start)(tp);
1547: } else {
1548: zst->zst_tx_stopped = 1;
1549: }
1550: }
1551: }
1552:
1553: /*
1554: * Software interrupt. Called at zssoft
1555: *
1556: * The main job to be done here is to empty the input ring
1557: * by passing its contents up to the tty layer. The ring is
1558: * always emptied during this operation, therefore the ring
1559: * must not be larger than the space after "high water" in
1560: * the tty layer, or the tty layer might drop our input.
1561: *
1562: * Note: an "input blockage" condition is assumed to exist if
1563: * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set.
1564: */
1565: static void
1566: zstty_softint(cs)
1567: struct zs_chanstate *cs;
1568: {
1569: struct zstty_softc *zst = cs->cs_private;
1570: struct tty *tp = zst->zst_tty;
1571: int s;
1572:
1573: s = spltty();
1574:
1575: if (zst->zst_rx_ready) {
1576: zst->zst_rx_ready = 0;
1577: zstty_rxsoft(zst, tp);
1578: }
1579:
1580: if (zst->zst_st_check) {
1581: zst->zst_st_check = 0;
1582: zstty_stsoft(zst, tp);
1583: }
1584:
1585: if (zst->zst_tx_done) {
1586: zst->zst_tx_done = 0;
1587: zstty_txsoft(zst, tp);
1588: }
1589:
1590: splx(s);
1591: }
1592:
1593: struct zsops zsops_tty = {
1594: zstty_rxint, /* receive char available */
1595: zstty_stint, /* external/status */
1596: zstty_txint, /* xmit buffer empty */
1597: zstty_softint, /* process software interrupt */
1598: };
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