/*      $NetBSD: m38813c.c,v 1.16 2021/09/07 06:36:06 rin Exp $ */

/*-
 * Copyright (c) 1999, 2001 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by UCHIYAMA Yasushi.
 *
 * 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.
 */

/*
 * Device driver for MITUBISHI M38813 controller
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: m38813c.c,v 1.16 2021/09/07 06:36:06 rin Exp $");

#include "opt_use_poll.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>

#include <mips/cpuregs.h>

#include <machine/bus.h>
#include <machine/intr.h>

#include <dev/hpc/hpckbdvar.h>

#include <hpcmips/tx/tx39var.h>
#include <hpcmips/tx/txcsbusvar.h>
#include <hpcmips/dev/m38813cvar.h>

struct m38813c_chip {
        bus_space_tag_t         scc_cst;
        bus_space_handle_t      scc_csh;
        int                     scc_enabled;
        int t_lastchar;
        int t_extended;
        int t_extended1;

        struct hpckbd_ic_if     scc_if;
        struct hpckbd_if        *scc_hpckbd;
};

struct m38813c_softc {
        struct m38813c_chip     *sc_chip;
        tx_chipset_tag_t        sc_tc;
        void                    *sc_ih;
};

int     m38813c_match(device_t, cfdata_t, void *);
void    m38813c_attach(device_t, device_t, void *);
int     m38813c_intr(void *);
int     m38813c_poll(void *);
void    m38813c_ifsetup(struct m38813c_chip *);
int     m38813c_input_establish(void *, struct hpckbd_if *);

struct m38813c_chip m38813c_chip;

CFATTACH_DECL_NEW(m38813c, sizeof(struct m38813c_softc),
    m38813c_match, m38813c_attach, NULL, NULL);

int
m38813c_match(device_t parent, cfdata_t cf, void *aux)
{

        return (1);
}

void
m38813c_attach(device_t parent, device_t self, void *aux)
{
        struct cs_attach_args *ca = aux;
        struct m38813c_softc *sc = device_private(self);
        struct hpckbd_attach_args haa;

        sc->sc_tc = ca->ca_tc;
        sc->sc_chip = &m38813c_chip;
        sc->sc_chip->scc_cst = ca->ca_csio.cstag;

        if (bus_space_map(sc->sc_chip->scc_cst, ca->ca_csio.csbase, 
            ca->ca_csio.cssize, 0, &sc->sc_chip->scc_csh)) {
                printf(": can't map i/o space\n");
        }

#ifndef USE_POLL
#error options USE_POLL required.
#endif
        if (!(sc->sc_ih = tx39_poll_establish(sc->sc_tc, 1,
            IPL_TTY, m38813c_intr,
            sc))) {
                printf(": can't establish interrupt\n");
        }

        printf("\n");

        /* setup upper interface */
        m38813c_ifsetup(sc->sc_chip);

        haa.haa_ic = &sc->sc_chip->scc_if;

        config_found(self, &haa, hpckbd_print, CFARGS_NONE);
}

void
m38813c_ifsetup(struct m38813c_chip *scc)
{

        scc->scc_if.hii_ctx             = scc;

        scc->scc_if.hii_establish       = m38813c_input_establish;
        scc->scc_if.hii_poll            = m38813c_intr;
}

int
m38813c_cnattach(paddr_t addr)
{
        struct m38813c_chip *scc = &m38813c_chip;
        
        scc->scc_csh = MIPS_PHYS_TO_KSEG1(addr);

        m38813c_ifsetup(scc);

        hpckbd_cnattach(&scc->scc_if);

        return (0);
}

int
m38813c_input_establish(void *ic, struct hpckbd_if *kbdif)
{
        struct m38813c_chip *scc = ic;

        /* save lower interface */
        scc->scc_hpckbd = kbdif;

        scc->scc_enabled = 1;

        return (0);
}

#define KBR_EXTENDED0   0xE0    /* extended key sequence */
#define KBR_EXTENDED1   0xE1    /* extended key sequence */

int
m38813c_intr(void *arg)
{
        struct m38813c_softc *sc = arg;

        return (m38813c_poll(sc->sc_chip));
}

int
m38813c_poll(void *arg)
{
        struct m38813c_chip *scc = arg;
        bus_space_tag_t t = scc->scc_cst;
        bus_space_handle_t h = scc->scc_csh;
        int datain, type, key;

        if (!scc->scc_enabled) {
                return (0);
        }

        datain= bus_space_read_1(t, h, 0);
        
        hpckbd_input_hook(scc->scc_hpckbd);

        if (datain == KBR_EXTENDED0) {
                scc->t_extended = 1;
                return (0);
        } else if (datain == KBR_EXTENDED1) {
                scc->t_extended1 = 2;
                return (0);
        }

        /* map extended keys to (unused) codes 128-254 */
        key = (datain & 0x7f) | (scc->t_extended ? 0x80 : 0);
        scc->t_extended = 0;

        /*
         * process BREAK key (EXT1 1D 45  EXT1 9D C5):
         * map to (unused) code 7F
         */
        if (scc->t_extended1 == 2 && (datain == 0x1d || datain == 0x9d)) {
                scc->t_extended1 = 1;
                return (0);
        } else if (scc->t_extended1 == 1 &&
            (datain == 0x45 || datain == 0xc5)) {
                scc->t_extended1 = 0;
                key = 0x7f;
        } else if (scc->t_extended1 > 0) {
                scc->t_extended1 = 0;
        }

        if (datain & 0x80) {
                scc->t_lastchar = 0;
                type = 0;
        } else {
                /* Always ignore typematic keys */
                if (key == scc->t_lastchar)
                        return 0;
                scc->t_lastchar = key;
                type = 1;
        }

        hpckbd_input(scc->scc_hpckbd, type, key);

        return (0);
}