/*      $NetBSD: spif.c,v 1.35 2022/10/26 23:46:50 riastradh Exp $      */
/*      $OpenBSD: spif.c,v 1.12 2003/10/03 16:44:51 miod Exp $  */

/*
 * Copyright (c) 1999-2002 Jason L. Wright (jason@thought.net)
 * All rights reserved.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 *
 * Effort sponsored in part by the Defense Advanced Research Projects
 * Agency (DARPA) and Air Force Research Laboratory, Air Force
 * Materiel Command, USAF, under agreement number F30602-01-2-0537.
 *
 */

/*
 * Driver for the SUNW,spif: 8 serial, 1 parallel sbus board
 * based heavily on Iain Hibbert's driver for the MAGMA cards
 */

/* Ported to NetBSD 2.0 by Hauke Fath */


#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: spif.c,v 1.35 2022/10/26 23:46:50 riastradh Exp $");

#include "spif.h"
#if NSPIF > 0

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/device.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/malloc.h>
#include <sys/tty.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/conf.h>
#include <sys/errno.h>
#include <sys/kauth.h>
#include <sys/intr.h>

#include <sys/bus.h>
#include <machine/autoconf.h>
#include <machine/promlib.h>

#include <dev/sbus/sbusvar.h>

#include <dev/sbus/spifvar.h>
#include <dev/sbus/spifreg.h>

#include "ioconf.h"

/* Autoconfig stuff */

CFATTACH_DECL_NEW(spif, sizeof(struct spif_softc),
    spif_match, spif_attach, NULL, NULL);

CFATTACH_DECL_NEW(stty, sizeof(struct stty_softc),
    stty_match, stty_attach, NULL, NULL);

CFATTACH_DECL_NEW(sbpp, sizeof(struct sbpp_softc),
    sbpp_match, sbpp_attach, NULL, NULL);

dev_type_open(stty_open);
dev_type_close(stty_close);
dev_type_read(stty_read);
dev_type_write(stty_write);
dev_type_ioctl(stty_ioctl);
dev_type_stop(stty_stop);
dev_type_tty(stty_tty);
dev_type_poll(stty_poll);

const struct cdevsw stty_cdevsw = {
        .d_open = stty_open,
        .d_close = stty_close,
        .d_read = stty_read,
        .d_write = stty_write,
        .d_ioctl = stty_ioctl,
        .d_stop = stty_stop,
        .d_tty = stty_tty,
        .d_poll = stty_poll,
        .d_mmap = nommap,
        .d_kqfilter = ttykqfilter,
        .d_discard = nodiscard,
        .d_flag = D_TTY
};

dev_type_open(sbpp_open);
dev_type_close(sbpp_close);
dev_type_read(sbpp_read);
dev_type_write(sbpp_write);
dev_type_ioctl(sbpp_ioctl);
dev_type_poll(sbpp_poll);

const struct cdevsw sbpp_cdevsw = {
        .d_open = sbpp_open,
        .d_close = sbpp_close,
        .d_read = sbpp_read,
        .d_write = sbpp_write,
        .d_ioctl = sbpp_ioctl,
        .d_stop = nostop,
        .d_tty = notty,
        .d_poll = sbpp_poll,
        .d_mmap = nommap,
        .d_kqfilter = nokqfilter,
        .d_discard = nodiscard,
        .d_flag = D_OTHER
};


/* normal STC access */
#define STC_WRITE(sc,r,v)       \
    bus_space_write_1((sc)->sc_bustag, (sc)->sc_stch, (r), (v))
#define STC_READ(sc,r)          \
    bus_space_read_1((sc)->sc_bustag, (sc)->sc_stch, (r))

/* IACK STC access */
#define ISTC_WRITE(sc,r,v)      \
    bus_space_write_1((sc)->sc_bustag, (sc)->sc_istch, (r), (v))
#define ISTC_READ(sc,r)         \
    bus_space_read_1((sc)->sc_bustag, (sc)->sc_istch, (r))

/* PPC access */
#define PPC_WRITE(sc,r,v)       \
    bus_space_write_1((sc)->sc_bustag, (sc)->sc_ppch, (r), (v))
#define PPC_READ(sc,r)          \
    bus_space_read_1((sc)->sc_bustag, (sc)->sc_ppch, (r))

#define DTR_WRITE(sc,port,v)                                            \
    do {                                                                \
        sc->sc_ttys->sc_port[(port)].sp_dtr = v;                        \
        bus_space_write_1((sc)->sc_bustag,                              \
            sc->sc_dtrh, port, (v == 0) ? 1 : 0);                       \
    } while (0)

#define DTR_READ(sc,port)       ((sc)->sc_ttys->sc_port[(port)].sp_dtr)


int
spif_match(device_t parent, cfdata_t vcf, void *aux)
{
        struct sbus_attach_args *sa = aux;

        if (strcmp(vcf->cf_name, sa->sa_name) &&
            strcmp("SUNW,spif", sa->sa_name))
                return (0);
        return (1);
}

void
spif_attach(device_t parent, device_t self, void *aux)
{
        struct spif_softc *sc = device_private(self);
        struct sbus_attach_args *sa = aux;

        sc->sc_dev = self;

        if (sa->sa_nintr != 2) {
                printf(": expected %d interrupts, got %d\n", 2, sa->sa_nintr);
                return;
        }

        if (sa->sa_nreg != 1) {
                printf(": expected %d registers, got %d\n", 1, sa->sa_nreg);
                return;
        }

        sc->sc_bustag = sa->sa_bustag;
        if (sbus_bus_map(sa->sa_bustag, sa->sa_slot,
            sa->sa_offset, sa->sa_size,
            0, &sc->sc_regh) != 0) {
                printf(": can't map registers\n");
                return;
        }

        if (bus_space_subregion(sc->sc_bustag, sc->sc_regh,
            DTR_REG_OFFSET, DTR_REG_LEN, &sc->sc_dtrh) != 0) {
                printf(": can't map dtr regs\n");
                goto fail_unmapregs;
        }

        if (bus_space_subregion(sc->sc_bustag, sc->sc_regh,
            STC_REG_OFFSET, STC_REG_LEN, &sc->sc_stch) != 0) {
                printf(": can't map dtr regs\n");
                goto fail_unmapregs;
        }

        if (bus_space_subregion(sc->sc_bustag, sc->sc_regh,
            ISTC_REG_OFFSET, ISTC_REG_LEN, &sc->sc_istch) != 0) {
                printf(": can't map dtr regs\n");
                goto fail_unmapregs;
        }

        if (bus_space_subregion(sc->sc_bustag, sc->sc_regh,
            PPC_REG_OFFSET, PPC_REG_LEN, &sc->sc_ppch) != 0) {
                printf(": can't map dtr regs\n");
                goto fail_unmapregs;
        }

        sc->sc_ppcih = bus_intr_establish(sa->sa_bustag,
            sa->sa_intr[PARALLEL_INTR].oi_pri, IPL_SERIAL, spif_ppcintr, sc);
        if (sc->sc_ppcih == NULL) {
                printf(": failed to establish ppc interrupt\n");
                goto fail_unmapregs;
        }

        sc->sc_stcih = bus_intr_establish(sa->sa_bustag,
            sa->sa_intr[SERIAL_INTR].oi_pri, IPL_SERIAL, spif_stcintr, sc);
        if (sc->sc_stcih == NULL) {
                printf(": failed to establish stc interrupt\n");
                goto fail_unmapregs;
        }

        sc->sc_softih = softint_establish(SOFTINT_SERIAL, spif_softintr, sc);
        if (sc->sc_softih == NULL) {
                printf(": can't get soft intr\n");
                goto fail_unmapregs;
        }

        sc->sc_node = sa->sa_node;

        sc->sc_rev = prom_getpropint(sc->sc_node, "revlev", 0);

        sc->sc_osc = prom_getpropint(sc->sc_node, "verosc", 0);
        switch (sc->sc_osc) {
        case SPIF_OSC10:
                sc->sc_osc = 10000000;
                break;
        case SPIF_OSC9:
        default:
                sc->sc_osc = 9830400;
                break;
        }

        sc->sc_nser = 8;
        sc->sc_npar = 1;

        sc->sc_rev2 = STC_READ(sc, STC_GFRCR);
        STC_WRITE(sc, STC_GSVR, 0);

        stty_write_ccr(sc, CD180_CCR_CMD_RESET | CD180_CCR_RESETALL);
        while (STC_READ(sc, STC_GSVR) != 0xff);
        while (STC_READ(sc, STC_GFRCR) != sc->sc_rev2);

        STC_WRITE(sc, STC_PPRH, CD180_PPRH);
        STC_WRITE(sc, STC_PPRL, CD180_PPRL);
        STC_WRITE(sc, STC_MSMR, SPIF_MSMR);
        STC_WRITE(sc, STC_TSMR, SPIF_TSMR);
        STC_WRITE(sc, STC_RSMR, SPIF_RSMR);
        STC_WRITE(sc, STC_GSVR, 0);
        STC_WRITE(sc, STC_GSCR1, 0);
        STC_WRITE(sc, STC_GSCR2, 0);
        STC_WRITE(sc, STC_GSCR3, 0);

        printf(": rev %x chiprev %x osc %sMHz\n",
            sc->sc_rev, sc->sc_rev2, clockfreq(sc->sc_osc));

        (void)config_found(self, stty_match, NULL, CFARGS_NONE);
        (void)config_found(self, sbpp_match, NULL, CFARGS_NONE);

        return;

fail_unmapregs:
        bus_space_unmap(sa->sa_bustag, sc->sc_regh, sa->sa_size);
}

int
stty_match(device_t parent, cfdata_t vcf, void *aux)
{
        struct spif_softc *sc = device_private(parent);

        return (aux == stty_match && sc->sc_ttys == NULL);
}

void
stty_attach(device_t parent, device_t dev, void *aux)
{
        struct spif_softc *sc = device_private(parent);
        struct stty_softc *ssc = device_private(dev);
        int port;

        sc->sc_dev = dev;
        sc->sc_ttys = ssc;

        for (port = 0; port < sc->sc_nser; port++) {
                struct stty_port *sp = &ssc->sc_port[port];
                struct tty *tp;

                DTR_WRITE(sc, port, 0);

                tp = tty_alloc();

                tp->t_oproc = stty_start;
                tp->t_param = stty_param;

                sp->sp_tty = tp;
                sp->sp_sc = sc;
                sp->sp_channel = port;

                sp->sp_rbuf = malloc(STTY_RBUF_SIZE, M_DEVBUF, M_WAITOK);
                sp->sp_rend = sp->sp_rbuf + STTY_RBUF_SIZE;
        }

        ssc->sc_nports = port;

        printf(": %d tty%s\n", port, port == 1 ? "" : "s");
}

int
stty_open(dev_t dev, int flags, int mode, struct lwp *l)
{
        struct spif_softc *csc;
        struct stty_softc *sc;
        struct stty_port *sp;
        struct tty *tp;
        int card = SPIF_CARD(dev);
        int port = SPIF_PORT(dev);

        sc = device_lookup_private(&stty_cd, card);
        csc = device_lookup_private(&spif_cd, card);
        if (sc == NULL || csc == NULL)
                return (ENXIO);

        if (port >= sc->sc_nports)
                return (ENXIO);

        sp = &sc->sc_port[port];
        tp = sp->sp_tty;
        tp->t_dev = dev;

        if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp))
                return (EBUSY);

        ttylock(tp);
        if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) {
                ttychars(tp);
                tp->t_iflag = TTYDEF_IFLAG;
                tp->t_oflag = TTYDEF_OFLAG;
                tp->t_cflag = TTYDEF_CFLAG;
                if (ISSET(sp->sp_openflags, TIOCFLAG_CLOCAL))
                        SET(tp->t_cflag, CLOCAL);
                if (ISSET(sp->sp_openflags, TIOCFLAG_CRTSCTS))
                        SET(tp->t_cflag, CRTSCTS);
                if (ISSET(sp->sp_openflags, TIOCFLAG_MDMBUF))
                        SET(tp->t_cflag, MDMBUF);
                tp->t_lflag = TTYDEF_LFLAG;
                tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;

                sp->sp_rput = sp->sp_rget = sp->sp_rbuf;

                STC_WRITE(csc, STC_CAR, sp->sp_channel);
                stty_write_ccr(csc, CD180_CCR_CMD_RESET|CD180_CCR_RESETCHAN);
                STC_WRITE(csc, STC_CAR, sp->sp_channel);

                stty_param(tp, &tp->t_termios);

                ttsetwater(tp);

                STC_WRITE(csc, STC_SRER, CD180_SRER_CD | CD180_SRER_RXD);

                if (ISSET(sp->sp_openflags, TIOCFLAG_SOFTCAR) || sp->sp_carrier)
                        SET(tp->t_state, TS_CARR_ON);
                else
                        CLR(tp->t_state, TS_CARR_ON);
        }

        if (!ISSET(flags, O_NONBLOCK)) {
                while (!ISSET(tp->t_cflag, CLOCAL) &&
                    !ISSET(tp->t_state, TS_CARR_ON)) {
                        int error;
                        error = ttysleep(tp, &tp->t_rawcv, true, 0);
                        if (error != 0) {
                                ttyunlock(tp);
                                return (error);
                        }
                }
        }
        ttyunlock(tp);

        return ((*tp->t_linesw->l_open)(dev, tp));
}

int
stty_close(dev_t dev, int flags, int mode, struct lwp *l)
{
        struct stty_softc *sc = device_lookup_private(&stty_cd, SPIF_CARD(dev));
        struct stty_port *sp = &sc->sc_port[SPIF_PORT(dev)];
        struct spif_softc *csc = sp->sp_sc;
        struct tty *tp = sp->sp_tty;
        int port = SPIF_PORT(dev);
        int s;

        (*tp->t_linesw->l_close)(tp, flags);
        s = spltty();

        if (ISSET(tp->t_cflag, HUPCL) || !ISSET(tp->t_state, TS_ISOPEN)) {
                stty_modem_control(sp, 0, DMSET);
                STC_WRITE(csc, STC_CAR, port);
                STC_WRITE(csc, STC_CCR,
                    CD180_CCR_CMD_RESET|CD180_CCR_RESETCHAN);
        }

        splx(s);
        ttyclose(tp);
        return (0);
}

int
stty_ioctl(dev_t dev, u_long cmd, void *data, int flags, struct lwp *l)
{
        struct stty_softc *stc = device_lookup_private(&stty_cd,
                                                       SPIF_CARD(dev));
        struct stty_port *sp = &stc->sc_port[SPIF_PORT(dev)];
        struct spif_softc *sc = sp->sp_sc;
        struct tty *tp = sp->sp_tty;
        int error;

        error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flags, l);
        if (error >= 0)
                return (error);

        error = ttioctl(tp, cmd, data, flags, l);
        if (error >= 0)
                return (error);

        error = 0;

        switch (cmd) {
        case TIOCSBRK:
                SET(sp->sp_flags, STTYF_SET_BREAK);
                STC_WRITE(sc, STC_CAR, sp->sp_channel);
                STC_WRITE(sc, STC_SRER,
                    STC_READ(sc, STC_SRER) | CD180_SRER_TXD);
                break;
        case TIOCCBRK:
                SET(sp->sp_flags, STTYF_CLR_BREAK);
                STC_WRITE(sc, STC_CAR, sp->sp_channel);
                STC_WRITE(sc, STC_SRER,
                    STC_READ(sc, STC_SRER) | CD180_SRER_TXD);
                break;
        case TIOCSDTR:
                stty_modem_control(sp, TIOCM_DTR, DMBIS);
                break;
        case TIOCCDTR:
                stty_modem_control(sp, TIOCM_DTR, DMBIC);
                break;
        case TIOCMBIS:
                stty_modem_control(sp, *((int *)data), DMBIS);
                break;
        case TIOCMBIC:
                stty_modem_control(sp, *((int *)data), DMBIC);
                break;
        case TIOCMGET:
                *((int *)data) = stty_modem_control(sp, 0, DMGET);
                break;
        case TIOCMSET:
                stty_modem_control(sp, *((int *)data), DMSET);
                break;
        case TIOCGFLAGS:
                *((int *)data) = sp->sp_openflags;
                break;
        case TIOCSFLAGS:
                if (kauth_authorize_device_tty(l->l_cred,
                    KAUTH_DEVICE_TTY_PRIVSET, tp))
                        error = EPERM;
                else
                        sp->sp_openflags = *((int *)data) &
                            (TIOCFLAG_SOFTCAR | TIOCFLAG_CLOCAL |
                             TIOCFLAG_CRTSCTS | TIOCFLAG_MDMBUF);
                break;
        default:
                error = ENOTTY;
        }

        return (error);
}

int
stty_modem_control(struct stty_port *sp, int bits, int how)
{
        struct spif_softc *csc = sp->sp_sc;
        struct tty *tp = sp->sp_tty;
        int s, msvr;

        s = spltty();
        STC_WRITE(csc, STC_CAR, sp->sp_channel);

        switch (how) {
        case DMGET:
                bits = TIOCM_LE;
                if (DTR_READ(csc, sp->sp_channel))
                        bits |= TIOCM_DTR;
                msvr = STC_READ(csc, STC_MSVR);
                if (ISSET(msvr, CD180_MSVR_DSR))
                        bits |= TIOCM_DSR;
                if (ISSET(msvr, CD180_MSVR_CD))
                        bits |= TIOCM_CD;
                if (ISSET(msvr, CD180_MSVR_CTS))
                        bits |= TIOCM_CTS;
                if (ISSET(msvr, CD180_MSVR_RTS))
                        bits |= TIOCM_RTS;
                break;
        case DMSET:
                DTR_WRITE(csc, sp->sp_channel, ISSET(bits, TIOCM_DTR) ? 1 : 0);
                if (ISSET(bits, TIOCM_RTS))
                        STC_WRITE(csc, STC_MSVR,
                            STC_READ(csc, STC_MSVR) & (~CD180_MSVR_RTS));
                else
                        STC_WRITE(csc, STC_MSVR,
                            STC_READ(csc, STC_MSVR) | CD180_MSVR_RTS);
                break;
        case DMBIS:
                if (ISSET(bits, TIOCM_DTR))
                        DTR_WRITE(csc, sp->sp_channel, 1);
                if (ISSET(bits, TIOCM_RTS) && !ISSET(tp->t_cflag, CRTSCTS))
                        STC_WRITE(csc, STC_MSVR,
                            STC_READ(csc, STC_MSVR) & (~CD180_MSVR_RTS));
                break;
        case DMBIC:
                if (ISSET(bits, TIOCM_DTR))
                        DTR_WRITE(csc, sp->sp_channel, 0);
                if (ISSET(bits, TIOCM_RTS))
                        STC_WRITE(csc, STC_MSVR,
                            STC_READ(csc, STC_MSVR) | CD180_MSVR_RTS);
                break;
        }

        splx(s);
        return (bits);
}

int
stty_param(struct tty *tp, struct termios *t)
{
        struct stty_softc *st = device_lookup_private(&stty_cd,
                                                      SPIF_CARD(tp->t_dev));
        struct stty_port *sp = &st->sc_port[SPIF_PORT(tp->t_dev)];
        struct spif_softc *sc = sp->sp_sc;
        uint8_t rbprl = 0, rbprh = 0, tbprl = 0, tbprh = 0;
        int s, opt;

        if (t->c_ospeed &&
            stty_compute_baud(t->c_ospeed, sc->sc_osc, &tbprl, &tbprh))
                return (EINVAL);

        if (t->c_ispeed &&
            stty_compute_baud(t->c_ispeed, sc->sc_osc, &rbprl, &rbprh))
                return (EINVAL);

        s = spltty();

        /* hang up line if ospeed is zero, otherwise raise DTR */
        stty_modem_control(sp, TIOCM_DTR,
            (t->c_ospeed == 0 ? DMBIC : DMBIS));

        STC_WRITE(sc, STC_CAR, sp->sp_channel);

        opt = 0;
        if (ISSET(t->c_cflag, PARENB)) {
                opt |= CD180_COR1_PARMODE_NORMAL;
                opt |= (ISSET(t->c_cflag, PARODD) ?
                                CD180_COR1_ODDPAR :
                                CD180_COR1_EVENPAR);
        }
        else
                opt |= CD180_COR1_PARMODE_NO;

        if (!ISSET(t->c_iflag, INPCK))
                opt |= CD180_COR1_IGNPAR;

        if (ISSET(t->c_cflag, CSTOPB))
                opt |= CD180_COR1_STOP2;

        switch (t->c_cflag & CSIZE) {
        case CS5:
                opt |= CD180_COR1_CS5;
                break;
        case CS6:
                opt |= CD180_COR1_CS6;
                break;
        case CS7:
                opt |= CD180_COR1_CS7;
                break;
        default:
                opt |= CD180_COR1_CS8;
                break;
        }
        STC_WRITE(sc, STC_COR1, opt);
        stty_write_ccr(sc, CD180_CCR_CMD_COR|CD180_CCR_CORCHG1);

        opt = CD180_COR2_ETC;
        if (ISSET(t->c_cflag, CRTSCTS))
                opt |= CD180_COR2_CTSAE;
        STC_WRITE(sc, STC_COR2, opt);
        stty_write_ccr(sc, CD180_CCR_CMD_COR|CD180_CCR_CORCHG2);

        STC_WRITE(sc, STC_COR3, STTY_RX_FIFO_THRESHOLD);
        stty_write_ccr(sc, CD180_CCR_CMD_COR|CD180_CCR_CORCHG3);

        STC_WRITE(sc, STC_SCHR1, 0x11);
        STC_WRITE(sc, STC_SCHR2, 0x13);
        STC_WRITE(sc, STC_SCHR3, 0x11);
        STC_WRITE(sc, STC_SCHR4, 0x13);
        STC_WRITE(sc, STC_RTPR, 0x12);

        STC_WRITE(sc, STC_MCOR1, CD180_MCOR1_CDZD | STTY_RX_DTR_THRESHOLD);
        STC_WRITE(sc, STC_MCOR2, CD180_MCOR2_CDOD);
        STC_WRITE(sc, STC_MCR, 0);

        if (t->c_ospeed) {
                STC_WRITE(sc, STC_TBPRH, tbprh);
                STC_WRITE(sc, STC_TBPRL, tbprl);
        }

        if (t->c_ispeed) {
                STC_WRITE(sc, STC_RBPRH, rbprh);
                STC_WRITE(sc, STC_RBPRL, rbprl);
        }

        stty_write_ccr(sc, CD180_CCR_CMD_CHAN |
            CD180_CCR_CHAN_TXEN | CD180_CCR_CHAN_RXEN);

        sp->sp_carrier = STC_READ(sc, STC_MSVR) & CD180_MSVR_CD;

        splx(s);
        return (0);
}

int
stty_read(dev_t dev, struct uio *uio, int flags)
{
        struct stty_softc *sc = device_lookup_private(&stty_cd, SPIF_CARD(dev));
        struct stty_port *sp = &sc->sc_port[SPIF_PORT(dev)];
        struct tty *tp = sp->sp_tty;

        return ((*tp->t_linesw->l_read)(tp, uio, flags));
}

int
stty_write(dev_t dev, struct uio *uio, int flags)
{
        struct stty_softc *sc = device_lookup_private(&stty_cd, SPIF_CARD(dev));
        struct stty_port *sp = &sc->sc_port[SPIF_PORT(dev)];
        struct tty *tp = sp->sp_tty;

        return ((*tp->t_linesw->l_write)(tp, uio, flags));
}

int
stty_poll(dev_t dev, int events, struct lwp *l)
{
        struct stty_softc *sc = device_lookup_private(&stty_cd, SPIF_CARD(dev));
        struct stty_port *sp = &sc->sc_port[SPIF_PORT(dev)];
        struct tty *tp = sp->sp_tty;

        return ((*tp->t_linesw->l_poll)(tp, events, l));
}

struct tty *
stty_tty(dev_t dev)
{
        struct stty_softc *sc = device_lookup_private(&stty_cd, SPIF_CARD(dev));
        struct stty_port *sp = &sc->sc_port[SPIF_PORT(dev)];

        return (sp->sp_tty);
}

void
stty_stop(struct tty *tp, int flags)
{
        struct stty_softc *sc = device_lookup_private(&stty_cd,
                                                      SPIF_CARD(tp->t_dev));
        struct stty_port *sp = &sc->sc_port[SPIF_PORT(tp->t_dev)];
        int s;

        s = spltty();
        if (ISSET(tp->t_state, TS_BUSY)) {
                if (!ISSET(tp->t_state, TS_TTSTOP))
                        SET(tp->t_state, TS_FLUSH);
                SET(sp->sp_flags, STTYF_STOP);
        }
        splx(s);
}

void
stty_start(struct tty *tp)
{
        struct stty_softc *stc = device_lookup_private(&stty_cd,
                                                       SPIF_CARD(tp->t_dev));
        struct stty_port *sp = &stc->sc_port[SPIF_PORT(tp->t_dev)];
        struct spif_softc *sc = sp->sp_sc;
        int s;

        s = spltty();

        if (!ISSET(tp->t_state, TS_TTSTOP | TS_TIMEOUT | TS_BUSY)) {
                if (ttypull(tp)) {
                        sp->sp_txc = ndqb(&tp->t_outq, 0);
                        sp->sp_txp = tp->t_outq.c_cf;
                        SET(tp->t_state, TS_BUSY);
                        STC_WRITE(sc, STC_CAR, sp->sp_channel);
                        STC_WRITE(sc, STC_SRER,
                            STC_READ(sc, STC_SRER) | CD180_SRER_TXD);
                }
        }

        splx(s);
}

int
spif_stcintr_rxexception(struct spif_softc *sc, int *needsoftp)
{
        struct stty_port *sp;
        uint8_t channel, *ptr;

        channel = CD180_GSCR_CHANNEL(STC_READ(sc, STC_GSCR1));
        sp = &sc->sc_ttys->sc_port[channel];
        ptr = sp->sp_rput;
        *ptr++ = STC_READ(sc, STC_RCSR);
        *ptr++ = STC_READ(sc, STC_RDR);
        if (ptr == sp->sp_rend)
                ptr = sp->sp_rbuf;
        if (ptr == sp->sp_rget) {
                if (ptr == sp->sp_rbuf)
                        ptr = sp->sp_rend;
                ptr -= 2;
                SET(sp->sp_flags, STTYF_RING_OVERFLOW);
        }
        STC_WRITE(sc, STC_EOSRR, 0);
        *needsoftp = 1;
        sp->sp_rput = ptr;
        return (1);
}

int
spif_stcintr_rx(struct spif_softc *sc, int *needsoftp)
{
        struct stty_port *sp;
        uint8_t channel, *ptr, cnt;
        int i;

        channel = CD180_GSCR_CHANNEL(STC_READ(sc, STC_GSCR1));
        sp = &sc->sc_ttys->sc_port[channel];
        ptr = sp->sp_rput;
        cnt = STC_READ(sc, STC_RDCR);
        for (i = 0; i < cnt; i++) {
                *ptr++ = 0;
                (void)STC_READ(sc, STC_RCSR);
                *ptr++ = STC_READ(sc, STC_RDR);
                if (ptr == sp->sp_rend)
                        ptr = sp->sp_rbuf;
                if (ptr == sp->sp_rget) {
                        if (ptr == sp->sp_rbuf)
                                ptr = sp->sp_rend;
                        ptr -= 2;
                        SET(sp->sp_flags, STTYF_RING_OVERFLOW);
                        break;
                }
        }
        STC_WRITE(sc, STC_EOSRR, 0);
        if (cnt) {
                *needsoftp = 1;
                sp->sp_rput = ptr;
        }
        return (1);
}

int
spif_stcintr_tx(struct spif_softc *sc, int *needsoftp)
{
        struct stty_port *sp;
        uint8_t channel, ch;
        int cnt = 0;

        channel = CD180_GSCR_CHANNEL(STC_READ(sc, STC_GSCR1));
        sp = &sc->sc_ttys->sc_port[channel];
        if (!ISSET(sp->sp_flags, STTYF_STOP)) {
                if (ISSET(sp->sp_flags, STTYF_SET_BREAK)) {
                        STC_WRITE(sc, STC_TDR, 0);
                        STC_WRITE(sc, STC_TDR, 0x81);
                        CLR(sp->sp_flags, STTYF_SET_BREAK);
                        cnt += 2;
                }
                if (ISSET(sp->sp_flags, STTYF_CLR_BREAK)) {
                        STC_WRITE(sc, STC_TDR, 0);
                        STC_WRITE(sc, STC_TDR, 0x83);
                        CLR(sp->sp_flags, STTYF_CLR_BREAK);
                        cnt += 2;
                }

                while (sp->sp_txc > 0 && cnt < (CD180_TX_FIFO_SIZE-1)) {
                        ch = *sp->sp_txp;
                        sp->sp_txc--;
                        sp->sp_txp++;

                        if (ch == 0) {
                                STC_WRITE(sc, STC_TDR, ch);
                                cnt++;
                        }
                        STC_WRITE(sc, STC_TDR, ch);
                        cnt++;
                }
        }

        if (sp->sp_txc == 0 ||
            ISSET(sp->sp_flags, STTYF_STOP)) {
                STC_WRITE(sc, STC_SRER, STC_READ(sc, STC_SRER) &
                    (~CD180_SRER_TXD));
                CLR(sp->sp_flags, STTYF_STOP);
                SET(sp->sp_flags, STTYF_DONE);
                *needsoftp = 1;
        }

        STC_WRITE(sc, STC_EOSRR, 0);

        return (1);
}

int
spif_stcintr_mx(struct spif_softc *sc, int *needsoftp)
{
        struct stty_port *sp;
        uint8_t channel, mcr;

        channel = CD180_GSCR_CHANNEL(STC_READ(sc, STC_GSCR1));
        sp = &sc->sc_ttys->sc_port[channel];
        mcr = STC_READ(sc, STC_MCR);
        if (mcr & CD180_MCR_CD) {
                SET(sp->sp_flags, STTYF_CDCHG);
                *needsoftp = 1;
        }
        STC_WRITE(sc, STC_MCR, 0);
        STC_WRITE(sc, STC_EOSRR, 0);
        return (1);
}

int
spif_stcintr(void *vsc)
{
        struct spif_softc *sc = (struct spif_softc *)vsc;
        int needsoft = 0, r = 0, i;
        uint8_t ar;

        for (i = 0; i < 8; i++) {
                ar = ISTC_READ(sc, STC_RRAR) & CD180_GSVR_IMASK;
                if (ar == CD180_GSVR_RXGOOD)
                        r |= spif_stcintr_rx(sc, &needsoft);
                else if (ar == CD180_GSVR_RXEXCEPTION)
                        r |= spif_stcintr_rxexception(sc, &needsoft);
        }

        for (i = 0; i < 8; i++) {
                ar = ISTC_READ(sc, STC_TRAR) & CD180_GSVR_IMASK;
                if (ar == CD180_GSVR_TXDATA)
                        r |= spif_stcintr_tx(sc, &needsoft);
        }

        for (i = 0; i < 8; i++) {
                ar = ISTC_READ(sc, STC_MRAR) & CD180_GSVR_IMASK;
                if (ar == CD180_GSVR_STATCHG)
                        r |= spif_stcintr_mx(sc, &needsoft);
        }

        if (needsoft)
                softint_schedule(sc->sc_softih);
        return (r);
}

void
spif_softintr(void *vsc)
{
        struct spif_softc *sc = (struct spif_softc *)vsc;
        struct stty_softc *stc = sc->sc_ttys;
        int i, data, s, flags;
        uint8_t stat, msvr;
        struct stty_port *sp;
        struct tty *tp;

        if (stc != NULL) {
                for (i = 0; i < stc->sc_nports; i++) {
                        sp = &stc->sc_port[i];
                        tp = sp->sp_tty;

                        if (!ISSET(tp->t_state, TS_ISOPEN))
                                continue;

                        while (sp->sp_rget != sp->sp_rput) {
                                stat = sp->sp_rget[0];
                                data = sp->sp_rget[1];
                                sp->sp_rget += 2;
                                if (sp->sp_rget == sp->sp_rend)
                                        sp->sp_rget = sp->sp_rbuf;

                                if (stat & (CD180_RCSR_BE | CD180_RCSR_FE))
                                        data |= TTY_FE;

                                if (stat & CD180_RCSR_PE)
                                        data |= TTY_PE;

                                (*tp->t_linesw->l_rint)(data, tp);
                        }

                        s = splhigh();
                        flags = sp->sp_flags;
                        CLR(sp->sp_flags, STTYF_DONE | STTYF_CDCHG |
                            STTYF_RING_OVERFLOW);
                        splx(s);

                        if (ISSET(flags, STTYF_CDCHG)) {
                                s = spltty();
                                STC_WRITE(sc, STC_CAR, i);
                                msvr = STC_READ(sc, STC_MSVR);
                                splx(s);

                                sp->sp_carrier = msvr & CD180_MSVR_CD;
                                (*tp->t_linesw->l_modem)(tp,
                                    sp->sp_carrier);
                        }

                        if (ISSET(flags, STTYF_RING_OVERFLOW)) {
                                log(LOG_WARNING, "%s-%x: ring overflow\n",
                                        device_xname(stc->sc_dev), i);
                        }

                        if (ISSET(flags, STTYF_DONE)) {
                                ndflush(&tp->t_outq,
                                    sp->sp_txp - tp->t_outq.c_cf);
                                CLR(tp->t_state, TS_BUSY);
                                (*tp->t_linesw->l_start)(tp);
                        }
                }
        }
}

void
stty_write_ccr(struct spif_softc *sc, uint8_t val)
{
        int tries = 100000;

        while (STC_READ(sc, STC_CCR) && tries--)
                /*EMPTY*/;
        if (tries == 0)
                aprint_error_dev(sc->sc_dev, "ccr timeout\n");
        STC_WRITE(sc, STC_CCR, val);
}

int
stty_compute_baud(speed_t speed, int clock, uint8_t *bprlp, uint8_t *bprhp)
{
        uint32_t rate;

        rate = (2 * clock) / (16 * speed);
        if (rate & 1)
                rate = (rate >> 1) + 1;
        else
                rate = rate >> 1;

        if (rate > 0xffff || rate == 0)
                return (1);

        *bprlp = rate & 0xff;
        *bprhp = (rate >> 8) & 0xff;
        return (0);
}

int
sbpp_match(device_t parent, cfdata_t vcf, void *aux)
{
        struct spif_softc *sc = device_private(parent);

        return (aux == sbpp_match && sc->sc_bpps == NULL);
}

void
sbpp_attach(device_t parent, device_t dev, void *aux)
{
        struct spif_softc *sc = device_private(parent);
        struct sbpp_softc *psc = device_private(dev);
        int port;

        sc->sc_bpps = psc;

        for (port = 0; port < sc->sc_npar; port++) {
        }

        psc->sc_nports = port;
        printf(": %d port%s\n", port, port == 1 ? "" : "s");
}

int
sbpp_open(dev_t dev, int flags, int mode, struct lwp *l)
{
        return (ENXIO);
}

int
sbpp_close(dev_t dev, int flags, int mode, struct lwp *l)
{
        return (ENXIO);
}

int
spif_ppcintr(void *v)
{
        return (0);
}

int
sbpp_read(dev_t dev, struct uio *uio, int flags)
{
        return (sbpp_rw(dev, uio));
}

int
sbpp_write(dev_t dev, struct uio *uio, int flags)
{
        return (sbpp_rw(dev, uio));
}

int
sbpp_rw(dev_t dev, struct uio *uio)
{
        return (ENXIO);
}

int
sbpp_poll(dev_t dev, int events, struct lwp *l)
{
        return (seltrue(dev, events, l));
}

int
sbpp_ioctl(dev_t dev, u_long cmd, void *data, int flags, struct lwp *l)
{
        int error;

        error = ENOTTY;

        return (error);
}

#endif /* NSPIF */