/*      $OpenBSD: z8530kbd.c,v 1.32 2024/05/13 01:15:50 jsg Exp $       */
/*      $NetBSD: z8530tty.c,v 1.77 2001/05/30 15:24:24 lukem Exp $      */

/*-
 * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998, 1999
 *      Charles M. Hannum.  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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Charles M. Hannum.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * 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.
 */

/*
 * Copyright (c) 1994 Gordon W. Ross
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * 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, Lawrence Berkeley Laboratory.
 *
 * 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.
 *
 *      @(#)zs.c        8.1 (Berkeley) 7/19/93
 */

/*
 * Zilog Z8530 Dual UART driver (tty interface)
 *
 * This is the "slave" driver that will be attached to
 * the "zsc" driver for plain "tty" async. serial lines.
 *
 * Credits, history:
 *
 * The original version of this code was the sparc/dev/zs.c driver
 * as distributed with the Berkeley 4.4 Lite release.  Since then,
 * Gordon Ross reorganized the code into the current parent/child
 * driver scheme, separating the Sun keyboard and mouse support
 * into independent child drivers.
 *
 * RTS/CTS flow-control support was a collaboration of:
 *      Gordon Ross <gwr@netbsd.org>,
 *      Bill Studenmund <wrstuden@loki.stanford.edu>
 *      Ian Dall <Ian.Dall@dsto.defence.gov.au>
 *
 * The driver was massively overhauled in November 1997 by Charles Hannum,
 * fixing *many* bugs, and substantially improving performance.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/device.h>
#include <sys/conf.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 <machine/autoconf.h>

#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wskbdvar.h>

#include <dev/sun/sunkbdreg.h>
#include <dev/sun/sunkbdvar.h>

#include <dev/ic/z8530reg.h>
#include <machine/z8530var.h>

#include <dev/cons.h>

/*
 * How many input characters we can buffer.
 * The port-specific var.h may override this.
 * Note: must be a power of two!
 */
#ifndef ZSKBD_RING_SIZE
#define ZSKBD_RING_SIZE 2048
#endif

struct cfdriver zskbd_cd = {
        NULL, "zskbd", DV_TTY
};

/*
 * Make this an option variable one can patch.
 * But be warned:  this must be a power of 2!
 */
u_int zskbd_rbuf_size = ZSKBD_RING_SIZE;

/* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */
u_int zskbd_rbuf_hiwat = (ZSKBD_RING_SIZE * 1) / 4;
u_int zskbd_rbuf_lowat = (ZSKBD_RING_SIZE * 3) / 4;

struct zskbd_softc {
        struct sunkbd_softc     sc_base;

        struct  zs_chanstate *zst_cs;

        struct timeout zst_diag_ch;

        u_int zst_overflows,
              zst_floods,
              zst_errors;

        int zst_hwflags,        /* see z8530var.h */
            zst_swflags;        /* TIOCFLAG_SOFTCAR, ... <ttycom.h> */

        u_int zst_r_hiwat,
              zst_r_lowat;
        u_char *volatile zst_rbget,
               *volatile zst_rbput;
        volatile u_int zst_rbavail;
        u_char *zst_rbuf,
               *zst_ebuf;

        /*
         * The transmit byte count and address are used for pseudo-DMA
         * output in the hardware interrupt code.  PDMA can be suspended
         * to get pending changes done; heldtbc is used for this.  It can
         * also be stopped for ^S; this sets TS_TTSTOP in tp->t_state.
         */
        u_char *zst_tba;                /* transmit buffer address */
        u_int zst_tbc,                  /* transmit byte count */
              zst_heldtbc;              /* held tbc while xmission stopped */

        u_char zst_tbuf[ZSKBD_RING_SIZE];
        u_char *zst_tbeg, *zst_tend, *zst_tbp;

        /* Flags to communicate with zskbd_softint() */
        volatile u_char zst_rx_flags,   /* receiver blocked */
#define RX_TTY_BLOCKED          0x01
#define RX_TTY_OVERFLOWED       0x02
#define RX_IBUF_BLOCKED         0x04
#define RX_IBUF_OVERFLOWED      0x08
#define RX_ANY_BLOCK            0x0f
                        zst_tx_busy,    /* working on an output chunk */
                        zst_tx_done,    /* done with one output chunk */
                        zst_tx_stopped, /* H/W level stop (lost CTS) */
                        zst_st_check,   /* got a status interrupt */
                        zst_rx_ready;

        /* PPS signal on DCD, with or without inkernel clock disciplining */
        u_char  zst_ppsmask;                    /* pps signal mask */
        u_char  zst_ppsassert;                  /* pps leading edge */
        u_char  zst_ppsclear;                   /* pps trailing edge */
};

/* Definition of the driver for autoconfig. */
static int      zskbd_match(struct device *, void *, void *);
static void     zskbd_attach(struct device *, struct device *, void *);

const struct cfattach zskbd_ca = {
        sizeof(struct zskbd_softc), zskbd_match, zskbd_attach
};

struct zsops zsops_kbd;

static void zs_modem(struct zskbd_softc *, int);
static void zs_hwiflow(struct zskbd_softc *);
static void zs_maskintr(struct zskbd_softc *);

/* Low-level routines. */
static void zskbd_rxint(struct zs_chanstate *);
static void zskbd_stint(struct zs_chanstate *, int);
static void zskbd_txint(struct zs_chanstate *);
static void zskbd_softint(struct zs_chanstate *);
static void zskbd_diag(void *);

int zskbd_init(struct zskbd_softc *);
void zskbd_putc(struct zskbd_softc *, u_int8_t);

/* wskbd glue */
void zskbd_cngetc(void *, u_int *, int *);
void zskbd_cnpollc(void *, int);

void zsstart_tx(struct zskbd_softc *);
int zsenqueue_tx(void *, u_int8_t *, u_int);

struct wskbd_consops zskbd_consops = {
        zskbd_cngetc,
        zskbd_cnpollc
};

#define ZSKBDUNIT(x)    (minor(x) & 0x7ffff)

/*
 * zskbd_match: how is this zs channel configured?
 */
int 
zskbd_match(struct device *parent, void *vcf, void *aux)
{
        struct cfdata *cf = vcf;
        struct zsc_attach_args *args = aux;
        int ret;

        /* If we're not looking for a keyboard, just exit */
        if (strcmp(args->type, "keyboard") != 0)
                return (0);

        ret = 10;

        /* Exact match is better than wildcard. */
        if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel)
                ret += 2;

        /* This driver accepts wildcard. */
        if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT)
                ret += 1;

        return (ret);
}

void 
zskbd_attach(struct device *parent, struct device *self, void *aux)
{
        struct zsc_softc *zsc = (void *)parent;
        struct zskbd_softc *zst = (void *)self;
        struct sunkbd_softc *ss = (void *)self;
        struct cfdata *cf = self->dv_cfdata;
        struct zsc_attach_args *args = aux;
        struct wskbddev_attach_args a;
        struct zs_chanstate *cs;
        int channel, s, tty_unit, console = 0;
        dev_t dev;

        ss->sc_sendcmd = zsenqueue_tx;
        timeout_set(&ss->sc_bellto, sunkbd_bellstop, zst);

        timeout_set(&zst->zst_diag_ch, zskbd_diag, zst);

        zst->zst_tbp = zst->zst_tba = zst->zst_tbeg = zst->zst_tbuf;
        zst->zst_tend = zst->zst_tbeg + ZSKBD_RING_SIZE;

        tty_unit = ss->sc_dev.dv_unit;
        channel = args->channel;
        cs = zsc->zsc_cs[channel];
        cs->cs_private = zst;
        cs->cs_ops = &zsops_kbd;

        zst->zst_cs = cs;
        zst->zst_swflags = cf->cf_flags;        /* softcar, etc. */
        zst->zst_hwflags = args->hwflags;
        dev = makedev(zs_major, tty_unit);

        if (zst->zst_swflags)
                printf(" flags 0x%x", zst->zst_swflags);

        /*
         * Check whether we serve as a console device.
         * XXX - split console input/output channels aren't
         *       supported yet on /dev/console
         */
        if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) != 0) {
                if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) {
                        args->consdev->cn_dev = dev;
                        cn_tab->cn_pollc = wskbd_cnpollc;
                        cn_tab->cn_getc = wskbd_cngetc;
                }
                cn_tab->cn_dev = dev;
                console = 1;
        }

        zst->zst_rbuf = malloc(zskbd_rbuf_size << 1, M_DEVBUF, M_WAITOK);
        zst->zst_ebuf = zst->zst_rbuf + (zskbd_rbuf_size << 1);
        /* Disable the high water mark. */
        zst->zst_r_hiwat = 0;
        zst->zst_r_lowat = 0;
        zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf;
        zst->zst_rbavail = zskbd_rbuf_size;

        /* if there are no enable/disable functions, assume the device
           is always enabled */
        if (!cs->enable)
                cs->enabled = 1;

        /*
         * Hardware init
         */
        if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) {
                /* Call zsparam similar to open. */

                /* Wait a while for previous console output to complete */
                DELAY(10000);
        } else if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_NORESET)) {
                /* Not the console; may need reset. */
                int reset;

                reset = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET;
                s = splzs();
                zs_write_reg(cs, 9, reset);
                splx(s);
        }

        /*
         * Probe for a keyboard.
         * If one is found, turn on receiver and status interrupts.
         * We defer the actual write of the register to zsparam(),
         * but we must make sure status interrupts are turned on by
         * the time zsparam() reads the initial rr0 state.
         */
        if (zskbd_init(zst)) {
                SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE);
                zs_write_reg(cs, 1, cs->cs_creg[1]);

                /* Make sure DTR is on now. */
                s = splzs();
                zs_modem(zst, 1);
                splx(s);
        } else {
                /* Will raise DTR in open. */
                s = splzs();
                zs_modem(zst, 0);
                splx(s);

                return;
        }

        ss->sc_click =
            strcmp(getpropstring(optionsnode, "keyboard-click?"), "true") == 0;
        sunkbd_setclick(ss, ss->sc_click);

        a.console = console;
        if (ISTYPE5(ss->sc_layout)) {
                a.keymap = &sunkbd5_keymapdata;
#ifndef SUNKBD5_LAYOUT
                if (ss->sc_layout < MAXSUNLAYOUT &&
                    sunkbd_layouts[ss->sc_layout] != -1)
                        sunkbd5_keymapdata.layout =
                            sunkbd_layouts[ss->sc_layout];
#endif
        } else {
                a.keymap = &sunkbd_keymapdata;
#ifndef SUNKBD_LAYOUT
                if (ss->sc_layout < MAXSUNLAYOUT &&
                    sunkbd_layouts[ss->sc_layout] != -1)
                        sunkbd_keymapdata.layout =
                            sunkbd_layouts[ss->sc_layout];
#endif
        }
        a.accessops = &sunkbd_accessops;
        a.accesscookie = zst;

        if (console)
                wskbd_cnattach(&zskbd_consops, zst, a.keymap);

        sunkbd_attach(ss, &a);
}

int
zskbd_init(struct zskbd_softc *zst)
{
        struct sunkbd_softc *ss = (void *)zst;
        struct zs_chanstate *cs = zst->zst_cs;
        int s, tries;
        u_int8_t v3, v4, v5, rr0;

        /* setup for 1200n81 */
        if (zs_set_speed(cs, 1200)) {                   /* set 1200bps */
                printf(": failed to set baudrate\n");
                return 0;
        }
        if (zs_set_modes(cs, CS8 | CLOCAL)) {
                printf(": failed to set modes\n");
                return 0;
        }

        s = splzs();

        zs_maskintr(zst);

        v3 = cs->cs_preg[3];                            /* set 8 bit chars */
        v5 = cs->cs_preg[5];
        CLR(v3, ZSWR3_RXSIZE);
        CLR(v5, ZSWR5_TXSIZE);
        SET(v3, ZSWR3_RX_8);
        SET(v5, ZSWR5_TX_8);
        cs->cs_preg[3] = v3;
        cs->cs_preg[5] = v5;

        v4 = cs->cs_preg[4];                            /* no parity 1 stop */
        CLR(v4, ZSWR4_SBMASK | ZSWR4_PARMASK);
        SET(v4, ZSWR4_ONESB | ZSWR4_EVENP);
        cs->cs_preg[4] = v4;

        if (!cs->cs_heldchange) {
                if (zst->zst_tx_busy) {
                        zst->zst_heldtbc = zst->zst_tbc;
                        zst->zst_tbc = 0;
                        cs->cs_heldchange = 1;
                } else
                        zs_loadchannelregs(cs);
        }

        /*
         * Hardware flow control is disabled, turn off the buffer water
         * marks and unblock any soft flow control state.  Otherwise, enable
         * the water marks.
         */
        zst->zst_r_hiwat = 0;
        zst->zst_r_lowat = 0;
        if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) {
                CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED);
                zst->zst_rx_ready = 1;
                cs->cs_softreq = 1;
        }
        if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) {
                CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED);
                zs_hwiflow(zst);
        }

        /*
         * Force a recheck of the hardware carrier and flow control status,
         * since we may have changed which bits we're looking at.
         */
        zskbd_stint(cs, 1);

        splx(s);

        /*
         * Hardware flow control is disabled, unblock any hard flow control
         * state.
         */
        if (zst->zst_tx_stopped) {
                zst->zst_tx_stopped = 0;
                zsstart_tx(zst);
        }

        zskbd_softint(cs);

        /* Ok, start the reset sequence... */

        s = splhigh();

        for (tries = 5; tries != 0; tries--) {
                int ltries;

                ss->sc_leds = 0;
                ss->sc_layout = -1;

                /* Send reset request */
                zskbd_putc(zst, SKBD_CMD_RESET);

                ltries = 1000;
                while (--ltries > 0) {
                        rr0 = *cs->cs_reg_csr;
                        if (rr0 & ZSRR0_RX_READY) {
                                sunkbd_raw(ss, *cs->cs_reg_data);
                                if (ss->sc_kbdstate == SKBD_STATE_RESET)
                                        break;
                        }
                        DELAY(1000);
                }
                if (ltries == 0)
                        continue;

                /* Wait for reset to finish. */
                ltries = 1000;
                while (--ltries > 0) {
                        rr0 = *cs->cs_reg_csr;
                        if (rr0 & ZSRR0_RX_READY) {
                                sunkbd_raw(ss, *cs->cs_reg_data);
                                if (ss->sc_kbdstate == SKBD_STATE_GETKEY)
                                        break;
                        }
                        DELAY(1000);
                }
                if (ltries == 0)
                        continue;

                /* Some Sun<=>PS/2 converters need some delay here */
                DELAY(5000);

                /* Send layout request */
                zskbd_putc(zst, SKBD_CMD_LAYOUT);

                ltries = 1000;
                while (--ltries > 0) {
                        rr0 = *cs->cs_reg_csr;
                        if (rr0 & ZSRR0_RX_READY) {
                                sunkbd_raw(ss, *cs->cs_reg_data);
                                if (ss->sc_layout != -1)
                                        break;
                        }
                        DELAY(1000);
                }
                if (ltries == 0)
                        continue;
                break;
        }
        if (tries == 0)
                printf(": no keyboard\n");
        else
                printf(": layout %d\n", ss->sc_layout);
        splx(s);

        return tries;
}

void
zskbd_putc(struct zskbd_softc *zst, u_int8_t c)
{
        u_int8_t rr0;
        int s;

        s = splhigh();
        do {
                rr0 = *zst->zst_cs->cs_reg_csr;
        } while ((rr0 & ZSRR0_TX_READY) == 0);
        *zst->zst_cs->cs_reg_data = c;
        delay(2);
        splx(s);
}

int
zsenqueue_tx(void *v, u_int8_t *str, u_int len)
{
        struct zskbd_softc *zst = v;
        int s;
        u_int i;

        s = splzs();
        if (zst->zst_tbc + len > ZSKBD_RING_SIZE) {
                splx(s);
                return (-1);
        }
        zst->zst_tbc += len;
        for (i = 0; i < len; i++) {
                *zst->zst_tbp = str[i];
                if (++zst->zst_tbp == zst->zst_tend)
                        zst->zst_tbp = zst->zst_tbeg;
        }
        splx(s);
        zsstart_tx(zst);
        return (0);
}

void
zsstart_tx(struct zskbd_softc *zst)
{
        struct zs_chanstate *cs = zst->zst_cs;
        int s, s1;

        s = spltty();

        if (zst->zst_tx_stopped)
                goto out;
        if (zst->zst_tbc == 0)
                goto out;

        s1 = splzs();

        zst->zst_tx_busy = 1;

        if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) {
                SET(cs->cs_preg[1], ZSWR1_TIE);
                cs->cs_creg[1] = cs->cs_preg[1];
                zs_write_reg(cs, 1, cs->cs_creg[1]);
        }

        zs_write_data(cs, *zst->zst_tba);

        zst->zst_tbc--;
        if (++zst->zst_tba == zst->zst_tend)
                zst->zst_tba = zst->zst_tbeg;

        splx(s1);

out:
        splx(s);
}

/*
 * Compute interrupt enable bits and set in the pending bits. Called both
 * in zsparam() and when PPS (pulse per second timing) state changes.
 * Must be called at splzs().
 */
static void
zs_maskintr(struct zskbd_softc *zst)
{
        struct zs_chanstate *cs = zst->zst_cs;
        int tmp15;

        cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd;
        if (zst->zst_ppsmask != 0)
                cs->cs_rr0_mask |= cs->cs_rr0_pps;
        tmp15 = cs->cs_preg[15];
        if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD))
                SET(tmp15, ZSWR15_DCD_IE);
        else
                CLR(tmp15, ZSWR15_DCD_IE);
        if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS))
                SET(tmp15, ZSWR15_CTS_IE);
        else
                CLR(tmp15, ZSWR15_CTS_IE);
        cs->cs_preg[15] = tmp15;
}


/*
 * Raise or lower modem control (DTR/RTS) signals.  If a character is
 * in transmission, the change is deferred.
 */
static void
zs_modem(struct zskbd_softc *zst, int onoff)
{
        struct zs_chanstate *cs = zst->zst_cs;

        if (cs->cs_wr5_dtr == 0)
                return;

        if (onoff)
                SET(cs->cs_preg[5], cs->cs_wr5_dtr);
        else
                CLR(cs->cs_preg[5], cs->cs_wr5_dtr);

        if (!cs->cs_heldchange) {
                if (zst->zst_tx_busy) {
                        zst->zst_heldtbc = zst->zst_tbc;
                        zst->zst_tbc = 0;
                        cs->cs_heldchange = 1;
                } else
                        zs_loadchannelregs(cs);
        }
}

/*
 * Internal version of zshwiflow
 * called at splzs
 */
static void
zs_hwiflow(struct zskbd_softc *zst)
{
        struct zs_chanstate *cs = zst->zst_cs;

        if (cs->cs_wr5_rts == 0)
                return;

        if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) {
                CLR(cs->cs_preg[5], cs->cs_wr5_rts);
                CLR(cs->cs_creg[5], cs->cs_wr5_rts);
        } else {
                SET(cs->cs_preg[5], cs->cs_wr5_rts);
                SET(cs->cs_creg[5], cs->cs_wr5_rts);
        }
        zs_write_reg(cs, 5, cs->cs_creg[5]);
}


/****************************************************************
 * Interface to the lower layer (zscc)
 ****************************************************************/

#define integrate
integrate void zskbd_rxsoft(struct zskbd_softc *);
integrate void zskbd_txsoft(struct zskbd_softc *);
integrate void zskbd_stsoft(struct zskbd_softc *);
/*
 * receiver ready interrupt.
 * called at splzs
 */
static void
zskbd_rxint(struct zs_chanstate *cs)
{
        struct zskbd_softc *zst = cs->cs_private;
        u_char *put, *end;
        u_int cc;
        u_char rr0, rr1, c;

        end = zst->zst_ebuf;
        put = zst->zst_rbput;
        cc = zst->zst_rbavail;

        while (cc > 0) {
                /*
                 * First read the status, because reading the received char
                 * destroys the status of this char.
                 */
                rr1 = zs_read_reg(cs, 1);
                c = zs_read_data(cs);

                if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) {
                        /* Clear the receive error. */
                        zs_write_csr(cs, ZSWR0_RESET_ERRORS);
                }

                put[0] = c;
                put[1] = rr1;
                put += 2;
                if (put >= end)
                        put = zst->zst_rbuf;
                cc--;

                rr0 = zs_read_csr(cs);
                if (!ISSET(rr0, ZSRR0_RX_READY))
                        break;
        }

        /*
         * Current string of incoming characters ended because
         * no more data was available or we ran out of space.
         * Schedule a receive event if any data was received.
         * If we're out of space, turn off receive interrupts.
         */
        zst->zst_rbput = put;
        zst->zst_rbavail = cc;
        if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) {
                zst->zst_rx_ready = 1;
                cs->cs_softreq = 1;
        }

        /*
         * See if we are in danger of overflowing a buffer. If
         * so, use hardware flow control to ease the pressure.
         */
        if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) &&
            cc < zst->zst_r_hiwat) {
                SET(zst->zst_rx_flags, RX_IBUF_BLOCKED);
                zs_hwiflow(zst);
        }

        /*
         * If we're out of space, disable receive interrupts
         * until the queue has drained a bit.
         */
        if (!cc) {
                SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED);
                CLR(cs->cs_preg[1], ZSWR1_RIE);
                cs->cs_creg[1] = cs->cs_preg[1];
                zs_write_reg(cs, 1, cs->cs_creg[1]);
        }
}

/*
 * transmitter ready interrupt.  (splzs)
 */
static void
zskbd_txint(struct zs_chanstate *cs)
{
        struct zskbd_softc *zst = cs->cs_private;

        /*
         * If we've delayed a parameter change, do it now, and restart
         * output.
         */
        if (cs->cs_heldchange) {
                zs_loadchannelregs(cs);
                cs->cs_heldchange = 0;
                zst->zst_tbc = zst->zst_heldtbc;
                zst->zst_heldtbc = 0;
        }

        /* Output the next character in the buffer, if any. */
        if (zst->zst_tbc > 0) {
                zs_write_data(cs, *zst->zst_tba);
                zst->zst_tbc--;
                if (++zst->zst_tba == zst->zst_tend)
                        zst->zst_tba = zst->zst_tbeg;
        } else {
                /* Disable transmit completion interrupts if necessary. */
                if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) {
                        CLR(cs->cs_preg[1], ZSWR1_TIE);
                        cs->cs_creg[1] = cs->cs_preg[1];
                        zs_write_reg(cs, 1, cs->cs_creg[1]);
                }
                if (zst->zst_tx_busy) {
                        zst->zst_tx_busy = 0;
                        zst->zst_tx_done = 1;
                        cs->cs_softreq = 1;
                }
        }
}

/*
 * status change interrupt.  (splzs)
 */
static void
zskbd_stint(struct zs_chanstate *cs, int force)
{
        struct zskbd_softc *zst = cs->cs_private;
        u_char rr0, delta;

        rr0 = zs_read_csr(cs);
        zs_write_csr(cs, ZSWR0_RESET_STATUS);

        /*
         * Check here for console break, so that we can abort
         * even when interrupts are locking up the machine.
         */
        if (!force)
                delta = rr0 ^ cs->cs_rr0;
        else
                delta = cs->cs_rr0_mask;
        cs->cs_rr0 = rr0;

        if (ISSET(delta, cs->cs_rr0_mask)) {
                SET(cs->cs_rr0_delta, delta);

                /*
                 * Stop output immediately if we lose the output
                 * flow control signal or carrier detect.
                 */
                if (ISSET(~rr0, cs->cs_rr0_mask)) {
                        zst->zst_tbc = 0;
                        zst->zst_heldtbc = 0;
                }

                zst->zst_st_check = 1;
                cs->cs_softreq = 1;
        }
}

void
zskbd_diag(void *arg)
{
        struct zskbd_softc *zst = arg;
        struct sunkbd_softc *ss = arg;
        int overflows, floods;
        int s;

        s = splzs();
        overflows = zst->zst_overflows;
        zst->zst_overflows = 0;
        floods = zst->zst_floods;
        zst->zst_floods = 0;
        zst->zst_errors = 0;
        splx(s);

        log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n",
            ss->sc_dev.dv_xname,
            overflows, overflows == 1 ? "" : "s",
            floods, floods == 1 ? "" : "s");
}

integrate void
zskbd_rxsoft(struct zskbd_softc *zst)
{
        struct sunkbd_softc *ss = (void *)zst;
        struct zs_chanstate *cs = zst->zst_cs;
        u_char *get, *end;
        u_int cc, scc;
        u_char rr1;
        int code;
        int s;
        u_int8_t cbuf[SUNKBD_MAX_INPUT_SIZE], *c;

        end = zst->zst_ebuf;
        get = zst->zst_rbget;
        scc = cc = zskbd_rbuf_size - zst->zst_rbavail;

        if (cc == zskbd_rbuf_size) {
                zst->zst_floods++;
                if (zst->zst_errors++ == 0)
                        timeout_add_sec(&zst->zst_diag_ch, 60);
        }

        c = cbuf;
        while (cc) {
                code = get[0];
                rr1 = get[1];
                if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) {
                        if (ISSET(rr1, ZSRR1_DO)) {
                                zst->zst_overflows++;
                                if (zst->zst_errors++ == 0)
                                        timeout_add_sec(&zst->zst_diag_ch, 60);
                        }
                        if (ISSET(rr1, ZSRR1_FE))
                                SET(code, TTY_FE);
                        if (ISSET(rr1, ZSRR1_PE))
                                SET(code, TTY_PE);
                }

                *c++ = code;
                if (c - cbuf == sizeof cbuf) {
                        sunkbd_input(ss, cbuf, c - cbuf);
                        c = cbuf;
                }

                get += 2;
                if (get >= end)
                        get = zst->zst_rbuf;
                cc--;
        }
        if (c != cbuf)
                sunkbd_input(ss, cbuf, c - cbuf);

        if (cc != scc) {
                zst->zst_rbget = get;
                s = splzs();
                cc = zst->zst_rbavail += scc - cc;
                /* Buffers should be ok again, release possible block. */
                if (cc >= zst->zst_r_lowat) {
                        if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) {
                                CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED);
                                SET(cs->cs_preg[1], ZSWR1_RIE);
                                cs->cs_creg[1] = cs->cs_preg[1];
                                zs_write_reg(cs, 1, cs->cs_creg[1]);
                        }
                        if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) {
                                CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED);
                                zs_hwiflow(zst);
                        }
                }
                splx(s);
        }
}

integrate void
zskbd_txsoft(struct zskbd_softc *zst)
{
}

integrate void
zskbd_stsoft(struct zskbd_softc *zst)
{
        struct zs_chanstate *cs = zst->zst_cs;
        u_char rr0, delta;
        int s;

        s = splzs();
        rr0 = cs->cs_rr0;
        delta = cs->cs_rr0_delta;
        cs->cs_rr0_delta = 0;
        splx(s);

        if (ISSET(delta, cs->cs_rr0_cts)) {
                /* Block or unblock output according to flow control. */
                if (ISSET(rr0, cs->cs_rr0_cts))
                        zst->zst_tx_stopped = 0;
                else
                        zst->zst_tx_stopped = 1;
        }
}

/*
 * Software interrupt.  Called at zssoft
 *
 * The main job to be done here is to empty the input ring
 * by passing its contents up to the tty layer.  The ring is
 * always emptied during this operation, therefore the ring
 * must not be larger than the space after "high water" in
 * the tty layer, or the tty layer might drop our input.
 *
 * Note: an "input blockage" condition is assumed to exist if
 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set.
 */
static void
zskbd_softint(struct zs_chanstate *cs)
{
        struct zskbd_softc *zst = cs->cs_private;
        int s;

        s = spltty();

        if (zst->zst_rx_ready) {
                zst->zst_rx_ready = 0;
                zskbd_rxsoft(zst);
        }

        if (zst->zst_st_check) {
                zst->zst_st_check = 0;
                zskbd_stsoft(zst);
        }

        if (zst->zst_tx_done) {
                zst->zst_tx_done = 0;
                zskbd_txsoft(zst);
        }

        splx(s);
}

struct zsops zsops_kbd = {
        zskbd_rxint,    /* receive char available */
        zskbd_stint,    /* external/status */
        zskbd_txint,    /* xmit buffer empty */
        zskbd_softint,  /* process software interrupt */
};

void
zskbd_cnpollc(void *v, int on)
{
}

void
zskbd_cngetc(void *v, u_int *type, int *data)
{
        struct zskbd_softc *zst = v;
        int s;
        u_int8_t c, rr0;

        s = splhigh();
        do {
                rr0 = *zst->zst_cs->cs_reg_csr;
        } while ((rr0 & ZSRR0_RX_READY) == 0);

        c = *zst->zst_cs->cs_reg_data;
        splx(s);

        sunkbd_decode(c, type, data);
}