/* $NetBSD: dcm.c,v 1.66.4.1 2006/06/21 14:51:23 yamt Exp $ */ /*- * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * Copyright (c) 1982, 1986, 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from Utah: $Hdr: dcm.c 1.29 92/01/21$ * * @(#)dcm.c 8.4 (Berkeley) 1/12/94 */ /* * Copyright (c) 1988 University of Utah. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from Utah: $Hdr: dcm.c 1.29 92/01/21$ * * @(#)dcm.c 8.4 (Berkeley) 1/12/94 */ /* * TODO: * Timeouts * Test console support. */ /* * 98642/MUX */ #include __KERNEL_RCSID(0, "$NetBSD: dcm.c,v 1.66.4.1 2006/06/21 14:51:23 yamt Exp $"); #include "opt_kgdb.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ioconf.h" #ifndef DEFAULT_BAUD_RATE #define DEFAULT_BAUD_RATE 9600 #endif static const struct speedtab dcmspeedtab[] = { { 0, BR_0 }, { 50, BR_50 }, { 75, BR_75 }, { 110, BR_110 }, { 134, BR_134 }, { 150, BR_150 }, { 300, BR_300 }, { 600, BR_600 }, { 1200, BR_1200 }, { 1800, BR_1800 }, { 2400, BR_2400 }, { 4800, BR_4800 }, { 9600, BR_9600 }, { 19200, BR_19200 }, { 38400, BR_38400 }, { -1, -1 }, }; /* u-sec per character based on baudrate (assumes 1 start/8 data/1 stop bit) */ #define DCM_USPERCH(s) (10000000 / (s)) /* * Per board interrupt scheme. 16.7ms is the polling interrupt rate * (16.7ms is about 550 baud, 38.4k is 72 chars in 16.7ms). */ #define DIS_TIMER 0 #define DIS_PERCHAR 1 #define DIS_RESET 2 static int dcmistype = -1; /* -1 == dynamic, 0 == timer, 1 == perchar */ static int dcminterval = 5; /* interval (secs) between checks */ struct dcmischeme { int dis_perchar; /* non-zero if interrupting per char */ long dis_time; /* last time examined */ int dis_intr; /* recv interrupts during last interval */ int dis_char; /* characters read during last interval */ }; #ifdef KGDB /* * Kernel GDB support */ #include extern dev_t kgdb_dev; extern int kgdb_rate; extern int kgdb_debug_init; #endif /* #define DCMSTATS */ #ifdef DEBUG int dcmdebug = 0x0; #define DDB_SIOERR 0x01 #define DDB_PARAM 0x02 #define DDB_INPUT 0x04 #define DDB_OUTPUT 0x08 #define DDB_INTR 0x10 #define DDB_IOCTL 0x20 #define DDB_INTSCHM 0x40 #define DDB_MODEM 0x80 #define DDB_OPENCLOSE 0x100 #endif #ifdef DCMSTATS #define DCMRBSIZE 94 #define DCMXBSIZE 24 struct dcmstats { long xints; /* # of xmit ints */ long xchars; /* # of xmit chars */ long xempty; /* times outq is empty in dcmstart */ long xrestarts; /* times completed while xmitting */ long rints; /* # of recv ints */ long rchars; /* # of recv chars */ long xsilo[DCMXBSIZE+2]; /* times this many chars xmit on one int */ long rsilo[DCMRBSIZE+2]; /* times this many chars read on one int */ }; #endif #define DCMUNIT(x) (minor(x) & 0x7ffff) #define DCMDIALOUT(x) (minor(x) & 0x80000) #define DCMBOARD(x) (((x) >> 2) & 0x3f) #define DCMPORT(x) ((x) & 3) /* * Conversion from "HP DCE" to almost-normal DCE: on the 638 8-port mux, * the distribution panel uses "HP DCE" conventions. If requested via * the device flags, we swap the inputs to something closer to normal DCE, * allowing a straight-through cable to a DTE or a reversed cable * to a DCE (reversing 2-3, 4-5, 8-20 and leaving 6 unconnected; * this gets "DCD" on pin 20 and "CTS" on 4, but doesn't connect * DSR or make RTS work, though). The following gives the full * details of a cable from this mux panel to a modem: * * HP modem * name pin pin name * HP inputs: * "Rx" 2 3 Tx * CTS 4 5 CTS (only needed for CCTS_OFLOW) * DCD 20 8 DCD * "DSR" 9 6 DSR (unneeded) * RI 22 22 RI (unneeded) * * HP outputs: * "Tx" 3 2 Rx * "DTR" 6 not connected * "RTS" 8 20 DTR * "SR" 23 4 RTS (often not needed) */ #define hp2dce_in(ibits) (iconv[(ibits) & 0xf]) static const char iconv[16] = { 0, MI_DM, MI_CTS, MI_CTS|MI_DM, MI_CD, MI_CD|MI_DM, MI_CD|MI_CTS, MI_CD|MI_CTS|MI_DM, MI_RI, MI_RI|MI_DM, MI_RI|MI_CTS, MI_RI|MI_CTS|MI_DM, MI_RI|MI_CD, MI_RI|MI_CD|MI_DM, MI_RI|MI_CD|MI_CTS, MI_RI|MI_CD|MI_CTS|MI_DM }; /* * Note that 8-port boards appear as 2 4-port boards at consecutive * select codes. */ #define NDCMPORT 4 struct dcm_softc { struct device sc_dev; /* generic device glue */ bus_space_tag_t sc_bst; bus_space_handle_t sc_bsh; struct dcmdevice *sc_dcm; /* pointer to hardware */ struct tty *sc_tty[NDCMPORT]; /* our tty instances */ struct modemreg *sc_modem[NDCMPORT]; /* modem control */ char sc_mcndlast[NDCMPORT]; /* XXX last modem status for port */ short sc_softCAR; /* mask of ports with soft-carrier */ struct dcmischeme sc_scheme; /* interrupt scheme for board */ /* * Mask of soft-carrier bits in config flags. */ #define DCM_SOFTCAR 0x0000000f int sc_flags; /* misc. configuration info */ /* * Bits for sc_flags */ #define DCM_ACTIVE 0x00000001 /* indicates board is alive */ #define DCM_ISCONSOLE 0x00000002 /* indicates board is console */ #define DCM_STDDCE 0x00000010 /* re-map DCE to standard */ #define DCM_FLAGMASK (DCM_STDDCE) /* mask of valid bits in config flags */ #ifdef DCMSTATS struct dcmstats sc_stats; /* metrics gathering */ #endif }; static int dcmintr(void *); static void dcmpint(struct dcm_softc *, int, int); static void dcmrint(struct dcm_softc *); static void dcmreadbuf(struct dcm_softc *, int); static void dcmxint(struct dcm_softc *, int); static void dcmmint(struct dcm_softc *, int, int); static int dcmparam(struct tty *, struct termios *); static void dcmstart(struct tty *); static int dcmmctl(dev_t, int, int); static void dcmsetischeme(int, int); static void dcminit(struct dcmdevice *, int, int); static int dcmselftest(struct dcm_softc *); static int dcmcngetc(dev_t); static void dcmcnputc(dev_t, int); int dcmcnattach(bus_space_tag_t, bus_addr_t, int); static int dcmmatch(struct device *, struct cfdata *, void *); static void dcmattach(struct device *, struct device *, void *); CFATTACH_DECL(dcm, sizeof(struct dcm_softc), dcmmatch, dcmattach, NULL, NULL); /* * Stuff for DCM console support. This could probably be done a little * better. */ static struct dcmdevice *dcm_cn = NULL; /* pointer to hardware */ static int dcmconsinit; /* has been initialized */ /* static int dcm_lastcnpri = CN_DEAD; */ /* XXX last priority */ static struct consdev dcm_cons = { NULL, NULL, dcmcngetc, dcmcnputc, nullcnpollc, NULL, NULL, NULL, NODEV, CN_REMOTE }; int dcmconscode; int dcmdefaultrate = DEFAULT_BAUD_RATE; int dcmconbrdbusy = 0; static dev_type_open(dcmopen); static dev_type_close(dcmclose); static dev_type_read(dcmread); static dev_type_write(dcmwrite); static dev_type_ioctl(dcmioctl); static dev_type_stop(dcmstop); static dev_type_tty(dcmtty); static dev_type_poll(dcmpoll); const struct cdevsw dcm_cdevsw = { dcmopen, dcmclose, dcmread, dcmwrite, dcmioctl, dcmstop, dcmtty, dcmpoll, nommap, ttykqfilter, D_TTY }; static int dcmmatch(struct device *parent, struct cfdata *match, void *aux) { struct dio_attach_args *da = aux; switch (da->da_id) { case DIO_DEVICE_ID_DCM: case DIO_DEVICE_ID_DCMREM: return (1); } return (0); } static void dcmattach(struct device *parent, struct device *self, void *aux) { struct dcm_softc *sc = (struct dcm_softc *)self; struct dio_attach_args *da = aux; struct dcmdevice *dcm; int brd = device_unit(self); int scode = da->da_scode; int i, mbits, code; sc->sc_flags = 0; if (scode == dcmconscode) { dcm = dcm_cn; sc->sc_flags |= DCM_ISCONSOLE; /* * We didn't know which unit this would be during * the console probe, so we have to fixup cn_dev here. * Note that we always assume port 1 on the board. */ cn_tab->cn_dev = makedev(cdevsw_lookup_major(&dcm_cdevsw), (brd << 2) | DCMCONSPORT); } else { sc->sc_bst = da->da_bst; if (bus_space_map(sc->sc_bst, da->da_addr, da->da_size, BUS_SPACE_MAP_LINEAR, &sc->sc_bsh)) { printf("\n%s: can't map registers\n", sc->sc_dev.dv_xname); return; } dcm = (struct dcmdevice *)bus_space_vaddr(sc->sc_bst, sc->sc_bsh); } sc->sc_dcm = dcm; /* * XXX someone _should_ fix this; the self test screws * autoconfig messages. */ if ((sc->sc_flags & DCM_ISCONSOLE) && dcmselftest(sc)) { printf("\n%s: self-test failed\n", sc->sc_dev.dv_xname); return; } /* Extract configuration info from flags. */ sc->sc_softCAR = device_cfdata(self)->cf_flags & DCM_SOFTCAR; sc->sc_flags |= device_cfdata(self)->cf_flags & DCM_FLAGMASK; /* Mark our unit as configured. */ sc->sc_flags |= DCM_ACTIVE; /* Establish the interrupt handler. */ (void) dio_intr_establish(dcmintr, sc, da->da_ipl, IPL_TTY); if (dcmistype == DIS_TIMER) dcmsetischeme(brd, DIS_RESET|DIS_TIMER); else dcmsetischeme(brd, DIS_RESET|DIS_PERCHAR); /* load pointers to modem control */ sc->sc_modem[0] = &dcm->dcm_modem0; sc->sc_modem[1] = &dcm->dcm_modem1; sc->sc_modem[2] = &dcm->dcm_modem2; sc->sc_modem[3] = &dcm->dcm_modem3; /* set DCD (modem) and CTS (flow control) on all ports */ if (sc->sc_flags & DCM_STDDCE) mbits = hp2dce_in(MI_CD|MI_CTS); else mbits = MI_CD|MI_CTS; for (i = 0; i < NDCMPORT; i++) sc->sc_modem[i]->mdmmsk = mbits; /* * Get current state of mdmin register on all ports, so that * deltas will work properly. */ for (i = 0; i < NDCMPORT; i++) { code = sc->sc_modem[i]->mdmin; if (sc->sc_flags & DCM_STDDCE) code = hp2dce_in(code); sc->sc_mcndlast[i] = code; } dcm->dcm_ic = IC_IE; /* turn all interrupts on */ /* * Need to reset baud rate, etc. of next print so reset dcmconsinit. * Also make sure console is always "hardwired" */ if (sc->sc_flags & DCM_ISCONSOLE) { dcmconsinit = 0; sc->sc_softCAR |= (1 << DCMCONSPORT); printf(": console on port %d\n", DCMCONSPORT); } else printf("\n"); #ifdef KGDB if (cdevsw_lookup(kgdb_dev) == &dcm_cdevsw && DCMBOARD(DCMUNIT(kgdb_dev)) == brd) { if (dcmconsole == DCMUNIT(kgdb_dev)) /* XXX fixme */ kgdb_dev = NODEV; /* can't debug over console port */ #ifndef KGDB_CHEAT /* * The following could potentially be replaced * by the corresponding code in dcmcnprobe. */ else { dcminit(dcm, DCMPORT(DCMUNIT(kgdb_dev)), kgdb_rate); if (kgdb_debug_init) { printf("%s port %d: ", sc->sc_dev.dv_xname, DCMPORT(DCMUNIT(kgdb_dev))); kgdb_connect(1); } else printf("%s port %d: kgdb enabled\n", sc->sc_dev.dv_xname, DCMPORT(DCMUNIT(kgdb_dev))); } /* end could be replaced */ #endif /* KGDB_CHEAT */ } #endif /* KGDB */ } /* ARGSUSED */ static int dcmopen(dev_t dev, int flag, int mode, struct lwp *l) { struct dcm_softc *sc; struct tty *tp; int unit, brd, port; int error = 0, mbits, s; unit = DCMUNIT(dev); brd = DCMBOARD(unit); port = DCMPORT(unit); if (brd >= dcm_cd.cd_ndevs || port >= NDCMPORT || (sc = dcm_cd.cd_devs[brd]) == NULL) return (ENXIO); if ((sc->sc_flags & DCM_ACTIVE) == 0) return (ENXIO); if (sc->sc_tty[port] == NULL) { tp = sc->sc_tty[port] = ttymalloc(); tty_attach(tp); } else tp = sc->sc_tty[port]; tp->t_oproc = dcmstart; tp->t_param = dcmparam; tp->t_dev = dev; if ((tp->t_state & TS_ISOPEN) && (tp->t_state & TS_XCLUDE) && kauth_authorize_generic(l->l_proc->p_cred, KAUTH_GENERIC_ISSUSER, &l->l_proc->p_acflag) != 0) return (EBUSY); s = spltty(); if ((tp->t_state & TS_ISOPEN) == 0 && tp->t_wopen == 0) { /* * Sanity clause: reset the card on first open. * The card might be left in an inconsistent state * if the card memory is read inadvertently. */ dcminit(sc->sc_dcm, port, dcmdefaultrate); ttychars(tp); tp->t_iflag = TTYDEF_IFLAG; tp->t_oflag = TTYDEF_OFLAG; tp->t_cflag = TTYDEF_CFLAG; tp->t_lflag = TTYDEF_LFLAG; tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; (void) dcmparam(tp, &tp->t_termios); ttsetwater(tp); /* Set modem control state. */ mbits = MO_ON; if (sc->sc_flags & DCM_STDDCE) mbits |= MO_SR; /* pin 23, could be used as RTS */ (void) dcmmctl(dev, mbits, DMSET); /* enable port */ /* Set soft-carrier if so configured. */ if ((sc->sc_softCAR & (1 << port)) || (dcmmctl(dev, MO_OFF, DMGET) & MI_CD)) tp->t_state |= TS_CARR_ON; } splx(s); #ifdef DEBUG if (dcmdebug & DDB_MODEM) printf("%s: dcmopen port %d softcarr %c\n", sc->sc_dev.dv_xname, port, (tp->t_state & TS_CARR_ON) ? '1' : '0'); #endif error = ttyopen(tp, DCMDIALOUT(dev), (flag & O_NONBLOCK)); if (error) goto bad; #ifdef DEBUG if (dcmdebug & DDB_OPENCLOSE) printf("%s port %d: dcmopen: st %x fl %x\n", sc->sc_dev.dv_xname, port, tp->t_state, tp->t_flags); #endif error = (*tp->t_linesw->l_open)(dev, tp); bad: return (error); } /*ARGSUSED*/ static int dcmclose(dev_t dev, int flag, int mode, struct lwp *l) { int s, unit, board, port; struct dcm_softc *sc; struct tty *tp; unit = DCMUNIT(dev); board = DCMBOARD(unit); port = DCMPORT(unit); sc = dcm_cd.cd_devs[board]; tp = sc->sc_tty[port]; (*tp->t_linesw->l_close)(tp, flag); s = spltty(); if (tp->t_cflag & HUPCL || tp->t_wopen != 0 || (tp->t_state & TS_ISOPEN) == 0) (void) dcmmctl(dev, MO_OFF, DMSET); #ifdef DEBUG if (dcmdebug & DDB_OPENCLOSE) printf("%s port %d: dcmclose: st %x fl %x\n", sc->sc_dev.dv_xname, port, tp->t_state, tp->t_flags); #endif splx(s); ttyclose(tp); #if 0 tty_detach(tp); ttyfree(tp); sc->sc_tty[port] == NULL; #endif return (0); } static int dcmread(dev_t dev, struct uio *uio, int flag) { int unit, board, port; struct dcm_softc *sc; struct tty *tp; unit = DCMUNIT(dev); board = DCMBOARD(unit); port = DCMPORT(unit); sc = dcm_cd.cd_devs[board]; tp = sc->sc_tty[port]; return ((*tp->t_linesw->l_read)(tp, uio, flag)); } static int dcmwrite(dev_t dev, struct uio *uio, int flag) { int unit, board, port; struct dcm_softc *sc; struct tty *tp; unit = DCMUNIT(dev); board = DCMBOARD(unit); port = DCMPORT(unit); sc = dcm_cd.cd_devs[board]; tp = sc->sc_tty[port]; return ((*tp->t_linesw->l_write)(tp, uio, flag)); } static int dcmpoll(dev_t dev, int events, struct lwp *l) { int unit, board, port; struct dcm_softc *sc; struct tty *tp; unit = DCMUNIT(dev); board = DCMBOARD(unit); port = DCMPORT(unit); sc = dcm_cd.cd_devs[board]; tp = sc->sc_tty[port]; return ((*tp->t_linesw->l_poll)(tp, events, l)); } static struct tty * dcmtty(dev_t dev) { int unit, board, port; struct dcm_softc *sc; unit = DCMUNIT(dev); board = DCMBOARD(unit); port = DCMPORT(unit); sc = dcm_cd.cd_devs[board]; return (sc->sc_tty[port]); } static int dcmintr(void *arg) { struct dcm_softc *sc = arg; struct dcmdevice *dcm = sc->sc_dcm; struct dcmischeme *dis = &sc->sc_scheme; int brd = device_unit(&sc->sc_dev); int code, i; int pcnd[4], mcode, mcnd[4]; /* * Do all guarded accesses right off to minimize * block out of hardware. */ SEM_LOCK(dcm); if ((dcm->dcm_ic & IC_IR) == 0) { SEM_UNLOCK(dcm); return (0); } for (i = 0; i < 4; i++) { pcnd[i] = dcm->dcm_icrtab[i].dcm_data; dcm->dcm_icrtab[i].dcm_data = 0; code = sc->sc_modem[i]->mdmin; if (sc->sc_flags & DCM_STDDCE) code = hp2dce_in(code); mcnd[i] = code; } code = dcm->dcm_iir & IIR_MASK; dcm->dcm_iir = 0; /* XXX doc claims read clears interrupt?! */ mcode = dcm->dcm_modemintr; dcm->dcm_modemintr = 0; SEM_UNLOCK(dcm); #ifdef DEBUG if (dcmdebug & DDB_INTR) { printf("%s: dcmintr: iir %x pc %x/%x/%x/%x ", sc->sc_dev.dv_xname, code, pcnd[0], pcnd[1], pcnd[2], pcnd[3]); printf("miir %x mc %x/%x/%x/%x\n", mcode, mcnd[0], mcnd[1], mcnd[2], mcnd[3]); } #endif if (code & IIR_TIMEO) dcmrint(sc); if (code & IIR_PORT0) dcmpint(sc, 0, pcnd[0]); if (code & IIR_PORT1) dcmpint(sc, 1, pcnd[1]); if (code & IIR_PORT2) dcmpint(sc, 2, pcnd[2]); if (code & IIR_PORT3) dcmpint(sc, 3, pcnd[3]); if (code & IIR_MODM) { if (mcode == 0 || mcode & 0x1) /* mcode==0 -> 98642 board */ dcmmint(sc, 0, mcnd[0]); if (mcode & 0x2) dcmmint(sc, 1, mcnd[1]); if (mcode & 0x4) dcmmint(sc, 2, mcnd[2]); if (mcode & 0x8) dcmmint(sc, 3, mcnd[3]); } /* * Chalk up a receiver interrupt if the timer running or one of * the ports reports a special character interrupt. */ if ((code & IIR_TIMEO) || ((pcnd[0]|pcnd[1]|pcnd[2]|pcnd[3]) & IT_SPEC)) dis->dis_intr++; /* * See if it is time to check/change the interrupt rate. */ if (dcmistype < 0 && (i = time.tv_sec - dis->dis_time) >= dcminterval) { /* * If currently per-character and averaged over 70 interrupts * per-second (66 is threshold of 600 baud) in last interval, * switch to timer mode. * * XXX decay counts ala load average to avoid spikes? */ if (dis->dis_perchar && dis->dis_intr > 70 * i) dcmsetischeme(brd, DIS_TIMER); /* * If currently using timer and had more interrupts than * received characters in the last interval, switch back * to per-character. Note that after changing to per-char * we must process any characters already in the queue * since they may have arrived before the bitmap was setup. * * XXX decay counts? */ else if (!dis->dis_perchar && dis->dis_intr > dis->dis_char) { dcmsetischeme(brd, DIS_PERCHAR); dcmrint(sc); } dis->dis_intr = dis->dis_char = 0; dis->dis_time = time.tv_sec; } return (1); } /* * Port interrupt. Can be two things: * First, it might be a special character (exception interrupt); * Second, it may be a buffer empty (transmit interrupt); */ static void dcmpint(struct dcm_softc *sc, int port, int code) { if (code & IT_SPEC) dcmreadbuf(sc, port); if (code & IT_TX) dcmxint(sc, port); } static void dcmrint(struct dcm_softc *sc) { int port; for (port = 0; port < NDCMPORT; port++) dcmreadbuf(sc, port); } static void dcmreadbuf(struct dcm_softc *sc, int port) { struct dcmdevice *dcm = sc->sc_dcm; struct dcmpreg *pp = dcm_preg(dcm, port); struct dcmrfifo *fifo; struct tty *tp; int c, stat; u_int head; int nch = 0; #ifdef DCMSTATS struct dcmstats *dsp = &sc->sc_stats; dsp->rints++; #endif tp = sc->sc_tty[port]; if (tp == NULL) return; if ((tp->t_state & TS_ISOPEN) == 0) { #ifdef KGDB int maj; maj = cdevsw_lookup_major(&dcm_cdevsw); if ((makedev(maj, minor(tp->t_dev)) == kgdb_dev) && (head = pp->r_head & RX_MASK) != (pp->r_tail & RX_MASK) && dcm->dcm_rfifos[3-port][head>>1].data_char == FRAME_START) { pp->r_head = (head + 2) & RX_MASK; kgdb_connect(0); /* trap into kgdb */ return; } #endif /* KGDB */ pp->r_head = pp->r_tail & RX_MASK; return; } head = pp->r_head & RX_MASK; fifo = &dcm->dcm_rfifos[3-port][head>>1]; /* * XXX upper bound on how many chars we will take in one swallow? */ while (head != (pp->r_tail & RX_MASK)) { /* * Get character/status and update head pointer as fast * as possible to make room for more characters. */ c = fifo->data_char; stat = fifo->data_stat; head = (head + 2) & RX_MASK; pp->r_head = head; fifo = head ? fifo+1 : &dcm->dcm_rfifos[3-port][0]; nch++; #ifdef DEBUG if (dcmdebug & DDB_INPUT) printf("%s port %d: dcmreadbuf: c%x('%c') s%x f%x h%x t%x\n", sc->sc_dev.dv_xname, port, c&0xFF, c, stat&0xFF, tp->t_flags, head, pp->r_tail); #endif /* * Check for and handle errors */ if (stat & RD_MASK) { #ifdef DEBUG if (dcmdebug & (DDB_INPUT|DDB_SIOERR)) printf("%s port %d: dcmreadbuf: err: c%x('%c') s%x\n", sc->sc_dev.dv_xname, port, stat, c&0xFF, c); #endif if (stat & (RD_BD | RD_FE)) c |= TTY_FE; else if (stat & RD_PE) c |= TTY_PE; else if (stat & RD_OVF) log(LOG_WARNING, "%s port %d: silo overflow\n", sc->sc_dev.dv_xname, port); else if (stat & RD_OE) log(LOG_WARNING, "%s port %d: uart overflow\n", sc->sc_dev.dv_xname, port); } (*tp->t_linesw->l_rint)(c, tp); } sc->sc_scheme.dis_char += nch; #ifdef DCMSTATS dsp->rchars += nch; if (nch <= DCMRBSIZE) dsp->rsilo[nch]++; else dsp->rsilo[DCMRBSIZE+1]++; #endif } static void dcmxint(struct dcm_softc *sc, int port) { struct tty *tp; tp = sc->sc_tty[port]; if (tp == NULL || (tp->t_state & TS_ISOPEN) == 0) return; tp->t_state &= ~TS_BUSY; if (tp->t_state & TS_FLUSH) tp->t_state &= ~TS_FLUSH; (*tp->t_linesw->l_start)(tp); } static void dcmmint(struct dcm_softc *sc, int port, int mcnd) { int delta; struct tty *tp; struct dcmdevice *dcm = sc->sc_dcm; #ifdef DEBUG if (dcmdebug & DDB_MODEM) printf("%s port %d: dcmmint: mcnd %x mcndlast %x\n", sc->sc_dev.dv_xname, port, mcnd, sc->sc_mcndlast[port]); #endif delta = mcnd ^ sc->sc_mcndlast[port]; sc->sc_mcndlast[port] = mcnd; tp = sc->sc_tty[port]; if (tp == NULL || (tp->t_state & TS_ISOPEN) == 0) return; if ((delta & MI_CTS) && (tp->t_state & TS_ISOPEN) && (tp->t_cflag & CCTS_OFLOW)) { if (mcnd & MI_CTS) { tp->t_state &= ~TS_TTSTOP; ttstart(tp); } else tp->t_state |= TS_TTSTOP; /* inline dcmstop */ } if (delta & MI_CD) { if (mcnd & MI_CD) (void)(*tp->t_linesw->l_modem)(tp, 1); else if ((sc->sc_softCAR & (1 << port)) == 0 && (*tp->t_linesw->l_modem)(tp, 0) == 0) { sc->sc_modem[port]->mdmout = MO_OFF; SEM_LOCK(dcm); dcm->dcm_modemchng |= (1 << port); dcm->dcm_cr |= CR_MODM; SEM_UNLOCK(dcm); DELAY(10); /* time to change lines */ } } } static int dcmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l) { struct dcm_softc *sc; struct tty *tp; struct dcmdevice *dcm; int board, port, unit = DCMUNIT(dev); int error, s; port = DCMPORT(unit); board = DCMBOARD(unit); sc = dcm_cd.cd_devs[board]; dcm = sc->sc_dcm; tp = sc->sc_tty[port]; #ifdef DEBUG if (dcmdebug & DDB_IOCTL) printf("%s port %d: dcmioctl: cmd %lx data %x flag %x\n", sc->sc_dev.dv_xname, port, cmd, *data, flag); #endif error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); if (error != EPASSTHROUGH) return (error); error = ttioctl(tp, cmd, data, flag, l); if (error != EPASSTHROUGH) return (error); switch (cmd) { case TIOCSBRK: /* * Wait for transmitter buffer to empty */ s = spltty(); while (dcm->dcm_thead[port].ptr != dcm->dcm_ttail[port].ptr) DELAY(DCM_USPERCH(tp->t_ospeed)); SEM_LOCK(dcm); dcm->dcm_cmdtab[port].dcm_data |= CT_BRK; dcm->dcm_cr |= (1 << port); /* start break */ SEM_UNLOCK(dcm); splx(s); break; case TIOCCBRK: SEM_LOCK(dcm); dcm->dcm_cmdtab[port].dcm_data |= CT_BRK; dcm->dcm_cr |= (1 << port); /* end break */ SEM_UNLOCK(dcm); break; case TIOCSDTR: (void) dcmmctl(dev, MO_ON, DMBIS); break; case TIOCCDTR: (void) dcmmctl(dev, MO_ON, DMBIC); break; case TIOCMSET: (void) dcmmctl(dev, *(int *)data, DMSET); break; case TIOCMBIS: (void) dcmmctl(dev, *(int *)data, DMBIS); break; case TIOCMBIC: (void) dcmmctl(dev, *(int *)data, DMBIC); break; case TIOCMGET: *(int *)data = dcmmctl(dev, 0, DMGET); break; case TIOCGFLAGS: { int bits = 0; if ((sc->sc_softCAR & (1 << port))) bits |= TIOCFLAG_SOFTCAR; if (tp->t_cflag & CLOCAL) bits |= TIOCFLAG_CLOCAL; *(int *)data = bits; break; } case TIOCSFLAGS: { int userbits; error = kauth_authorize_generic(l->l_proc->p_cred, KAUTH_GENERIC_ISSUSER, &l->l_proc->p_acflag); if (error) return (EPERM); userbits = *(int *)data; if ((userbits & TIOCFLAG_SOFTCAR) || ((sc->sc_flags & DCM_ISCONSOLE) && (port == DCMCONSPORT))) sc->sc_softCAR |= (1 << port); if (userbits & TIOCFLAG_CLOCAL) tp->t_cflag |= CLOCAL; break; } default: return (EPASSTHROUGH); } return (0); } static int dcmparam(struct tty *tp, struct termios *t) { struct dcm_softc *sc; struct dcmdevice *dcm; int unit, board, port, mode, cflag = t->c_cflag; int ospeed = ttspeedtab(t->c_ospeed, dcmspeedtab); unit = DCMUNIT(tp->t_dev); board = DCMBOARD(unit); port = DCMPORT(unit); sc = dcm_cd.cd_devs[board]; dcm = sc->sc_dcm; /* check requested parameters */ if (ospeed < 0 || (t->c_ispeed && t->c_ispeed != t->c_ospeed)) return (EINVAL); /* and copy to tty */ tp->t_ispeed = t->c_ispeed; tp->t_ospeed = t->c_ospeed; tp->t_cflag = cflag; if (ospeed == 0) { (void) dcmmctl(DCMUNIT(tp->t_dev), MO_OFF, DMSET); return (0); } mode = 0; switch (cflag&CSIZE) { case CS5: mode = LC_5BITS; break; case CS6: mode = LC_6BITS; break; case CS7: mode = LC_7BITS; break; case CS8: mode = LC_8BITS; break; } if (cflag&PARENB) { if (cflag&PARODD) mode |= LC_PODD; else mode |= LC_PEVEN; } if (cflag&CSTOPB) mode |= LC_2STOP; else mode |= LC_1STOP; #ifdef DEBUG if (dcmdebug & DDB_PARAM) printf("%s port %d: dcmparam: cflag %x mode %x speed %d uperch %d\n", sc->sc_dev.dv_xname, port, cflag, mode, tp->t_ospeed, DCM_USPERCH(tp->t_ospeed)); #endif /* * Wait for transmitter buffer to empty. */ while (dcm->dcm_thead[port].ptr != dcm->dcm_ttail[port].ptr) DELAY(DCM_USPERCH(tp->t_ospeed)); /* * Make changes known to hardware. */ dcm->dcm_data[port].dcm_baud = ospeed; dcm->dcm_data[port].dcm_conf = mode; SEM_LOCK(dcm); dcm->dcm_cmdtab[port].dcm_data |= CT_CON; dcm->dcm_cr |= (1 << port); SEM_UNLOCK(dcm); /* * Delay for config change to take place. Weighted by baud. * XXX why do we do this? */ DELAY(16 * DCM_USPERCH(tp->t_ospeed)); return (0); } static void dcmstart(struct tty *tp) { struct dcm_softc *sc; struct dcmdevice *dcm; struct dcmpreg *pp; struct dcmtfifo *fifo; char *bp; u_int head, tail, next; int unit, board, port, nch; char buf[16]; int s; #ifdef DCMSTATS struct dcmstats *dsp = &sc->sc_stats; int tch = 0; #endif unit = DCMUNIT(tp->t_dev); board = DCMBOARD(unit); port = DCMPORT(unit); sc = dcm_cd.cd_devs[board]; dcm = sc->sc_dcm; s = spltty(); #ifdef DCMSTATS dsp->xints++; #endif #ifdef DEBUG if (dcmdebug & DDB_OUTPUT) printf("%s port %d: dcmstart: state %x flags %x outcc %d\n", sc->sc_dev.dv_xname, port, tp->t_state, tp->t_flags, tp->t_outq.c_cc); #endif if (tp->t_state & (TS_TIMEOUT|TS_BUSY|TS_TTSTOP)) goto out; if (tp->t_outq.c_cc <= tp->t_lowat) { if (tp->t_state&TS_ASLEEP) { tp->t_state &= ~TS_ASLEEP; wakeup((caddr_t)&tp->t_outq); } selwakeup(&tp->t_wsel); } if (tp->t_outq.c_cc == 0) { #ifdef DCMSTATS dsp->xempty++; #endif goto out; } pp = dcm_preg(dcm, port); tail = pp->t_tail & TX_MASK; next = (tail + 1) & TX_MASK; head = pp->t_head & TX_MASK; if (head == next) goto out; fifo = &dcm->dcm_tfifos[3-port][tail]; again: nch = q_to_b(&tp->t_outq, buf, (head - next) & TX_MASK); #ifdef DCMSTATS tch += nch; #endif #ifdef DEBUG if (dcmdebug & DDB_OUTPUT) printf("\thead %x tail %x nch %d\n", head, tail, nch); #endif /* * Loop transmitting all the characters we can. */ for (bp = buf; --nch >= 0; bp++) { fifo->data_char = *bp; pp->t_tail = next; /* * If this is the first character, * get the hardware moving right now. */ if (bp == buf) { tp->t_state |= TS_BUSY; SEM_LOCK(dcm); dcm->dcm_cmdtab[port].dcm_data |= CT_TX; dcm->dcm_cr |= (1 << port); SEM_UNLOCK(dcm); } tail = next; fifo = tail ? fifo+1 : &dcm->dcm_tfifos[3-port][0]; next = (next + 1) & TX_MASK; } /* * Head changed while we were loading the buffer, * go back and load some more if we can. */ if (tp->t_outq.c_cc && head != (pp->t_head & TX_MASK)) { #ifdef DCMSTATS dsp->xrestarts++; #endif head = pp->t_head & TX_MASK; goto again; } /* * Kick it one last time in case it finished while we were * loading the last bunch. */ if (bp > &buf[1]) { tp->t_state |= TS_BUSY; SEM_LOCK(dcm); dcm->dcm_cmdtab[port].dcm_data |= CT_TX; dcm->dcm_cr |= (1 << port); SEM_UNLOCK(dcm); } #ifdef DEBUG if (dcmdebug & DDB_INTR) printf("%s port %d: dcmstart: head %x tail %x outqcc %d\n", sc->sc_dev.dv_xname, port, head, tail, tp->t_outq.c_cc); #endif out: #ifdef DCMSTATS dsp->xchars += tch; if (tch <= DCMXBSIZE) dsp->xsilo[tch]++; else dsp->xsilo[DCMXBSIZE+1]++; #endif splx(s); } /* * Stop output on a line. */ static void dcmstop(struct tty *tp, int flag) { int s; s = spltty(); if (tp->t_state & TS_BUSY) { /* XXX is there some way to safely stop transmission? */ if ((tp->t_state&TS_TTSTOP) == 0) tp->t_state |= TS_FLUSH; } splx(s); } /* * Modem control */ int dcmmctl(dev_t dev, int bits, int how) { struct dcm_softc *sc; struct dcmdevice *dcm; int s, unit, brd, port, hit = 0; unit = DCMUNIT(dev); brd = DCMBOARD(unit); port = DCMPORT(unit); sc = dcm_cd.cd_devs[brd]; dcm = sc->sc_dcm; #ifdef DEBUG if (dcmdebug & DDB_MODEM) printf("%s port %d: dcmmctl: bits 0x%x how %x\n", sc->sc_dev.dv_xname, port, bits, how); #endif s = spltty(); switch (how) { case DMSET: sc->sc_modem[port]->mdmout = bits; hit++; break; case DMBIS: sc->sc_modem[port]->mdmout |= bits; hit++; break; case DMBIC: sc->sc_modem[port]->mdmout &= ~bits; hit++; break; case DMGET: bits = sc->sc_modem[port]->mdmin; if (sc->sc_flags & DCM_STDDCE) bits = hp2dce_in(bits); break; } if (hit) { SEM_LOCK(dcm); dcm->dcm_modemchng |= 1<<(unit & 3); dcm->dcm_cr |= CR_MODM; SEM_UNLOCK(dcm); DELAY(10); /* delay until done */ splx(s); } return (bits); } /* * Set board to either interrupt per-character or at a fixed interval. */ static void dcmsetischeme(int brd, int flags) { struct dcm_softc *sc = dcm_cd.cd_devs[brd]; struct dcmdevice *dcm = sc->sc_dcm; struct dcmischeme *dis = &sc->sc_scheme; int i; u_char mask; int perchar = flags & DIS_PERCHAR; #ifdef DEBUG if (dcmdebug & DDB_INTSCHM) printf("%s: dcmsetischeme(%d): cur %d, ints %d, chars %d\n", sc->sc_dev.dv_xname, perchar, dis->dis_perchar, dis->dis_intr, dis->dis_char); if ((flags & DIS_RESET) == 0 && perchar == dis->dis_perchar) { printf("%s: dcmsetischeme: redundent request %d\n", sc->sc_dev.dv_xname, perchar); return; } #endif /* * If perchar is non-zero, we enable interrupts on all characters * otherwise we disable perchar interrupts and use periodic * polling interrupts. */ dis->dis_perchar = perchar; mask = perchar ? 0xf : 0x0; for (i = 0; i < 256; i++) dcm->dcm_bmap[i].data_data = mask; /* * Don't slow down tandem mode, interrupt on flow control * chars for any port on the board. */ if (!perchar) { struct tty *tp; int c; for (i = 0; i < NDCMPORT; i++) { tp = sc->sc_tty[i]; if ((c = tp->t_cc[VSTART]) != _POSIX_VDISABLE) dcm->dcm_bmap[c].data_data |= (1 << i); if ((c = tp->t_cc[VSTOP]) != _POSIX_VDISABLE) dcm->dcm_bmap[c].data_data |= (1 << i); } } /* * Board starts with timer disabled so if first call is to * set perchar mode then we don't want to toggle the timer. */ if (flags == (DIS_RESET|DIS_PERCHAR)) return; /* * Toggle card 16.7ms interrupts (we first make sure that card * has cleared the bit so it will see the toggle). */ while (dcm->dcm_cr & CR_TIMER) ; SEM_LOCK(dcm); dcm->dcm_cr |= CR_TIMER; SEM_UNLOCK(dcm); } static void dcminit(struct dcmdevice *dcm, int port, int rate) { int s, mode; mode = LC_8BITS | LC_1STOP; s = splhigh(); /* * Wait for transmitter buffer to empty. */ while (dcm->dcm_thead[port].ptr != dcm->dcm_ttail[port].ptr) DELAY(DCM_USPERCH(rate)); /* * Make changes known to hardware. */ dcm->dcm_data[port].dcm_baud = ttspeedtab(rate, dcmspeedtab); dcm->dcm_data[port].dcm_conf = mode; SEM_LOCK(dcm); dcm->dcm_cmdtab[port].dcm_data |= CT_CON; dcm->dcm_cr |= (1 << port); SEM_UNLOCK(dcm); /* * Delay for config change to take place. Weighted by baud. * XXX why do we do this? */ DELAY(16 * DCM_USPERCH(rate)); splx(s); } /* * Empirically derived self-test magic */ static int dcmselftest(struct dcm_softc *sc) { struct dcmdevice *dcm = sc->sc_dcm; int timo = 0; int s, rv; rv = 1; s = splhigh(); dcm->dcm_rsid = DCMRS; DELAY(50000); /* 5000 is not long enough */ dcm->dcm_rsid = 0; dcm->dcm_ic = IC_IE; dcm->dcm_cr = CR_SELFT; while ((dcm->dcm_ic & IC_IR) == 0) { if (++timo == 20000) goto out; DELAY(1); } DELAY(50000); /* XXX why is this needed ???? */ while ((dcm->dcm_iir & IIR_SELFT) == 0) { if (++timo == 400000) goto out; DELAY(1); } DELAY(50000); /* XXX why is this needed ???? */ if (dcm->dcm_stcon != ST_OK) { #if 0 if (hd->hp_args->hw_sc != conscode) printf("dcm%d: self test failed: %x\n", brd, dcm->dcm_stcon); #endif goto out; } dcm->dcm_ic = IC_ID; rv = 0; out: splx(s); return (rv); } /* * Following are all routines needed for DCM to act as console */ int dcmcnattach(bus_space_tag_t bst, bus_addr_t addr, int scode) { bus_space_handle_t bsh; caddr_t va; struct dcmdevice *dcm; int maj; if (bus_space_map(bst, addr, DIOCSIZE, 0, &bsh)) return (1); va = bus_space_vaddr(bst, bsh); dcm = (struct dcmdevice *)va; switch (dcm->dcm_rsid) { #ifdef CONSCODE case DCMID: #endif case DCMID|DCMCON: break; default: goto error; } dcminit(dcm, DCMCONSPORT, dcmdefaultrate); dcmconsinit = 1; dcmconscode = scode; dcm_cn = dcm; /* locate the major number */ maj = cdevsw_lookup_major(&dcm_cdevsw); /* initialize required fields */ cn_tab = &dcm_cons; cn_tab->cn_dev = makedev(maj, 0); #ifdef KGDB_CHEAT /* XXX this needs to be fixed. */ /* * This doesn't currently work, at least not with ite consoles; * the console hasn't been initialized yet. */ if (major(kgdb_dev) == maj && DCMBOARD(DCMUNIT(kgdb_dev)) == DCMBOARD(unit)) { dcminit(dcm_cn, DCMPORT(DCMUNIT(kgdb_dev)), kgdb_rate); if (kgdb_debug_init) { /* * We assume that console is ready for us... * this assumes that a dca or ite console * has been selected already and will init * on the first putc. */ printf("dcm%d: ", DCMUNIT(kgdb_dev)); kgdb_connect(1); } } #endif return (0); error: bus_space_unmap(bst, bsh, DIOCSIZE); return (1); } /* ARGSUSED */ static int dcmcngetc(dev_t dev) { struct dcmrfifo *fifo; struct dcmpreg *pp; u_int head; int s, c, stat; pp = dcm_preg(dcm_cn, DCMCONSPORT); s = splhigh(); head = pp->r_head & RX_MASK; fifo = &dcm_cn->dcm_rfifos[3-DCMCONSPORT][head>>1]; while (head == (pp->r_tail & RX_MASK)) ; /* * If board interrupts are enabled, just let our received char * interrupt through in case some other port on the board was * busy. Otherwise we must clear the interrupt. */ SEM_LOCK(dcm_cn); if ((dcm_cn->dcm_ic & IC_IE) == 0) stat = dcm_cn->dcm_iir; SEM_UNLOCK(dcm_cn); c = fifo->data_char; stat = fifo->data_stat; pp->r_head = (head + 2) & RX_MASK; splx(s); return (c); } /* * Console kernel output character routine. */ /* ARGSUSED */ static void dcmcnputc(dev_t dev, int c) { struct dcmpreg *pp; unsigned tail; int s, stat; pp = dcm_preg(dcm_cn, DCMCONSPORT); s = splhigh(); #ifdef KGDB if (dev != kgdb_dev) #endif if (dcmconsinit == 0) { dcminit(dcm_cn, DCMCONSPORT, dcmdefaultrate); dcmconsinit = 1; } tail = pp->t_tail & TX_MASK; while (tail != (pp->t_head & TX_MASK)) ; dcm_cn->dcm_tfifos[3-DCMCONSPORT][tail].data_char = c; pp->t_tail = tail = (tail + 1) & TX_MASK; SEM_LOCK(dcm_cn); dcm_cn->dcm_cmdtab[DCMCONSPORT].dcm_data |= CT_TX; dcm_cn->dcm_cr |= (1 << DCMCONSPORT); SEM_UNLOCK(dcm_cn); while (tail != (pp->t_head & TX_MASK)) ; /* * If board interrupts are enabled, just let our completion * interrupt through in case some other port on the board * was busy. Otherwise we must clear the interrupt. */ if ((dcm_cn->dcm_ic & IC_IE) == 0) { SEM_LOCK(dcm_cn); stat = dcm_cn->dcm_iir; SEM_UNLOCK(dcm_cn); } splx(s); }