/*      $NetBSD: dz_ibus.c,v 1.14 2021/08/07 16:19:02 thorpej Exp $     */

/*-
 * Copyright (c) 2002, 2003 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Andrew Doran.
 *
 * 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 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) 1998 Ludd, University of Lule}, Sweden.
 * 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 at Ludd, University of 
 *      Lule}, Sweden and its contributors.
 * 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: dz_ibus.c,v 1.14 2021/08/07 16:19:02 thorpej Exp $");

#include "dzkbd.h"
#include "dzms.h"

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/proc.h>
#include <sys/reboot.h>
#include <sys/systm.h>
#include <sys/tty.h>

#include <dev/cons.h>

#include <dev/tc/tcvar.h>               /* tc_addr_t */

#include <dev/dec/dzreg.h>
#include <dev/dec/dzvar.h>
#include <dev/dec/dzkbdvar.h>

#include <pmax/ibus/ibusvar.h>
#include <pmax/pmax/pmaxtype.h>
#include <pmax/pmax/cons.h>

#define DZ_LINE_KBD     0
#define DZ_LINE_MOUSE   1
#define DZ_LINE_CONSOLE 2
#define DZ_LINE_AUX     3

int     dz_ibus_match(device_t, cfdata_t, void *);
void    dz_ibus_attach(device_t, device_t, void *);
int     dz_ibus_intr(void *);
void    dz_ibus_cnsetup(paddr_t);
int     dz_ibus_cngetc(dev_t);
void    dz_ibus_cnputc(dev_t, int);
void    dz_ibus_cnpollc(dev_t, int);
int     dz_ibus_getmajor(void);
int     dz_ibus_print(void *, const char *);

int     dzgetc(struct dz_linestate *);
void    dzputc(struct dz_linestate *, int);

CFATTACH_DECL_NEW(dz_ibus, sizeof(struct dz_softc),
    dz_ibus_match, dz_ibus_attach, NULL, NULL);

struct consdev dz_ibus_consdev = {
        NULL, NULL, dz_ibus_cngetc, dz_ibus_cnputc,
        dz_ibus_cnpollc, NULL, NULL, NULL, NODEV, CN_NORMAL,
};

struct dzregs {
        uint16_t        csr;    /* 00 Csr: control/status */
        uint16_t        p0[3];

        uint16_t        rbuf;   /* 08 Rbuf/Lpr: receive buffer/line param  */
        uint16_t        p1[3];

        uint16_t        tcr;    /* 10 Tcr: transmit console */
        uint16_t        p2[3];

        uint16_t        tdr;    /* 18 Msr/Tdr: modem status reg/xmit data */
        uint16_t        p3[3];
} volatile *dzcn;

int     dz_ibus_iscn;
int     dz_ibus_consln = -1;

int
dz_ibus_match(device_t parent, cfdata_t cf, void *aux)
{
        struct ibus_attach_args *iba = aux;

        if (strcmp(iba->ia_name, "dc") != 0 &&
            strcmp(iba->ia_name, "mdc") != 0 &&
            strcmp(iba->ia_name, "dc7085") != 0)
                return (0);

        if (badaddr((void *)iba->ia_addr, 2))
                return (0);

        return (1);
}

void
dz_ibus_attach(device_t parent, device_t self, void *aux)
{
        struct ibus_attach_args *iba = aux;
        struct dz_softc *sc = device_private(self);
        volatile struct dzregs *dz;
#if NDZMS > 0 || NDZKBD > 0
        struct dzkm_attach_args daa;
#endif
        int i;


        DELAY(100000);

        sc->sc_dev = self;

        /* 
         * XXX - This is evil and ugly, but... due to the nature of how
         * bus_space_* works on pmax it will do for the time being.
         */
        sc->sc_iot = normal_memt;
        sc->sc_ioh = (bus_space_handle_t)MIPS_PHYS_TO_KSEG1(iba->ia_addr);

        sc->sc_dr.dr_csr = 0;
        sc->sc_dr.dr_rbuf = 8;
        sc->sc_dr.dr_dtr = 17;
        sc->sc_dr.dr_break = 25;
        sc->sc_dr.dr_tbuf = 24;
        sc->sc_dr.dr_tcr = 16;
        sc->sc_dr.dr_dcd = 25;
        sc->sc_dr.dr_ring = 24;

        sc->sc_dr.dr_firstreg = 0;
        sc->sc_dr.dr_winsize = sizeof(struct dzregs);

        sc->sc_type = DZ_DZV;

        dz = (volatile struct dzregs *)sc->sc_ioh;
        i = dz->tcr;
        dz->csr = DZ_CSR_MSE | DZ_CSR_TXIE;
        dz->tcr = 0;
        wbflush();
        DELAY(1000);
        dz->tcr = 1;
        wbflush();
        DELAY(100000);
        dz->tcr = i;
        wbflush();

        sc->sc_dsr = 0x0f; /* XXX check if VS has modem ctrl bits */

        aprint_normal(": DC-7085, 4 lines");
        ibus_intr_establish(parent, (void *)iba->ia_cookie, IPL_TTY,
            dz_ibus_intr, sc);
        dzattach(sc, NULL, dz_ibus_consln);
        DELAY(10000);

        if (systype == DS_PMAX || systype == DS_3MAX) {
#if NDZKBD > 0
                if (!dz_ibus_iscn)
                        dz->rbuf = DZ_LPR_RX_ENABLE | (DZ_LPR_B4800 << 8) |
                            DZ_LPR_8_BIT_CHAR | DZ_LINE_KBD;
                daa.daa_line = DZ_LINE_KBD;
                daa.daa_flags = (dz_ibus_iscn ? 0 : DZKBD_CONSOLE);
                config_found(self, &daa, dz_ibus_print, CFARGS_NONE);
#endif
#if NDZMS > 0
                dz->rbuf = DZ_LPR_RX_ENABLE | (DZ_LPR_B4800 << 8) |
                    DZ_LPR_8_BIT_CHAR | DZ_LPR_PARENB | DZ_LPR_OPAR |
                    DZ_LINE_MOUSE;
                daa.daa_line = DZ_LINE_MOUSE;
                daa.daa_flags = 0;
                config_found(self, &daa, dz_ibus_print, CFARGS_NONE);
#endif
        }
}

int
dz_ibus_getmajor(void)
{
        extern const struct cdevsw dz_cdevsw;
        static int cache = -1;

        if (cache != -1)
                return (cache);

        return (cache = cdevsw_lookup_major(&dz_cdevsw));
}

int
dz_ibus_intr(void *cookie)
{
        struct dz_softc *sc;
        volatile struct dzregs *dzr;
        unsigned csr;

        sc = cookie;
        dzr = (volatile struct dzregs *)sc->sc_ioh;

        while (((csr = dzr->csr) & (DZ_CSR_RX_DONE | DZ_CSR_TX_READY)) != 0) {
                if ((csr & DZ_CSR_RX_DONE) != 0)
                        dzrint(sc);
                if ((csr & DZ_CSR_TX_READY) != 0)
                        dzxint(sc);
        }

        return (0);
}

void
dz_ibus_cnsetup(paddr_t addr)
{

        dzcn = (void *)MIPS_PHYS_TO_KSEG1(addr);
}

void
dz_ibus_cnattach(int line)
{

        switch (line) {
        case 0:
                line = DZ_LINE_KBD;
                break;
        case 4:
                line = DZ_LINE_CONSOLE;
                break;
        default:
                line = DZ_LINE_AUX;
                break;
        }

        dz_ibus_iscn = 1;
        dz_ibus_consln = line;

        /* Disable scanning until init is done. */
        dzcn->csr = 0;
        wbflush();
        DELAY(1000);

        /* Turn on transmitter for the console. */
        dzcn->tcr = (1 << line);
        wbflush();
        DELAY(1000);

        /* Turn scanning back on. */
        dzcn->csr = 0x20;
        wbflush();
        DELAY(1000);

        /*
         * Point the console at the DZ-11.
         */
        cn_tab = &dz_ibus_consdev;
        cn_tab->cn_pri = CN_REMOTE;
        cn_tab->cn_dev = makedev(dz_ibus_getmajor(), line);
}

int
dz_ibus_cngetc(dev_t dev)
{
        int c, line, s;
        uint16_t rbuf;

        c = 0;
        line = minor(dev);
        s = spltty();

        do {
                while ((dzcn->csr & DZ_CSR_RX_DONE) == 0)
                        DELAY(10);
                DELAY(10);
                rbuf = dzcn->rbuf;
                if (((rbuf >> 8) & 3) != line)
                        continue;
                c = rbuf & 0x7f;
        } while (c == 17 || c == 19);           /* ignore XON/XOFF */

        splx(s);
        if (c == 13)
                c = 10;
        return (c);
}

void
dz_ibus_cnputc(dev_t dev, int ch)
{
        int timeout, s;
        uint16_t tcr;

        s = spltty();

        /* Don't hang the machine! */
        timeout = 1 << 15;

        /* Remember which lines to scan */
        tcr = dzcn->tcr;
        dzcn->tcr = (1 << minor(dev));
        wbflush();
        DELAY(10);

        /* Wait until ready */
        while ((dzcn->csr & 0x8000) == 0)
                if (--timeout < 0)
                        break;
        DELAY(10);

        /* Put the character */
        dzcn->tdr = ch;
        timeout = 1 << 15;
        wbflush();
        DELAY(10);

        /* Wait until ready */
        while ((dzcn->csr & 0x8000) == 0)
                if (--timeout < 0)
                        break;

        DELAY(10);
        dzcn->tcr = tcr;
        wbflush();
        DELAY(10);
        splx(s);
}

void    
dz_ibus_cnpollc(dev_t dev, int pollflag)
{

}

#if NDZKBD > 0 || NDZMS > 0
int
dz_ibus_print(void *aux, const char *pnp)
{
        struct dzkm_attach_args *daa;

        daa = aux;
        if (pnp != NULL)
                aprint_normal("lkkbd/vsms at %s", pnp);
        aprint_normal(" line %d", daa->daa_line);
        return (UNCONF);
}

int
dzgetc(struct dz_linestate *ls)
{
        volatile struct dzregs *dzr;
        int line, s;
        uint16_t rbuf;

        if (ls == NULL) {
                /*
                 * dzkbd is the only thing that should put us here.
                 */
                line = DZ_LINE_KBD;
                dzr = dzcn;
        } else {
                line = ls->dz_line;
                dzr = (volatile struct dzregs *)ls->dz_sc->sc_ioh;
        }

        s = spltty();
        for (;;) {
                while ((dzr->csr & DZ_CSR_RX_DONE) == 0)
                        DELAY(10);
                DELAY(10);
                rbuf = dzr->rbuf;
                DELAY(10);
                if (((rbuf >> 8) & 3) == line)
                        return (rbuf & 0xff);
        }
        splx(s);
}

void
dzputc(struct dz_linestate *ls, int ch)
{
        volatile struct dzregs *dzr;
        int line;
        uint16_t tcr;
        int s;

        /*
         * If the dz has already been attached, the MI driver will do the
         * transmitting:
         */
        if (ls != NULL && ls->dz_sc != NULL) {
                line = ls->dz_line;
                dzr = (volatile struct dzregs *)ls->dz_sc->sc_ioh;
                s = spltty();
                putc(ch, &ls->dz_tty->t_outq);
                tcr = dzr->tcr;
                if ((tcr & (1 << line)) == 0) {
                        dzr->tcr = tcr | (1 << line);
                        wbflush();
                        DELAY(10);
                }
                dzxint(ls->dz_sc);
                splx(s);
                return;
        }

        /* Use dzcnputc to do the transmitting. */
        dz_ibus_cnputc(makedev(dz_ibus_getmajor(), DZ_LINE_KBD), ch);
}
#endif /* NDZKBD > 0 || NDZMS > 0 */