Annotation of sys/arch/macppc/dev/z8530tty.c, Revision 1.1
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: };
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