/*      $NetBSD: rtfps.c,v 1.62 2021/08/07 16:19:12 thorpej Exp $       */

/*
 * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
 * Copyright (c) 1995 Charles M. Hannum.  All rights reserved.
 *
 * This code is derived from public-domain software written by
 * Roland McGrath.
 *
 * 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rtfps.c,v 1.62 2021/08/07 16:19:12 thorpej Exp $");

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

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

#include <dev/ic/comreg.h>
#include <dev/ic/comvar.h>

#include <dev/isa/isavar.h>
#include <dev/isa/com_multi.h>

#define NSLAVES 4

struct rtfps_softc {
        void *sc_ih;

        bus_space_tag_t sc_iot;
        int sc_iobase;
        int sc_irqport;
        bus_space_handle_t sc_irqioh;

        int sc_alive;                   /* mask of slave units attached */
        void *sc_slaves[NSLAVES];       /* com device unit numbers */
        bus_space_handle_t sc_slaveioh[NSLAVES];
};

int rtfpsprobe(device_t, cfdata_t, void *);
void rtfpsattach(device_t, device_t, void *);
int rtfpsintr(void *);

CFATTACH_DECL_NEW(rtfps, sizeof(struct rtfps_softc),
    rtfpsprobe, rtfpsattach, NULL, NULL);

int
rtfpsprobe(device_t parent, cfdata_t self, void *aux)
{
        struct isa_attach_args *ia = aux;
        bus_space_tag_t iot = ia->ia_iot;
        bus_space_handle_t ioh;
        int i, iobase, rv = 1;

        /*
         * Do the normal com probe for the first UART and assume
         * its presence, and the ability to map the other UARTS,
         * means there is a multiport board there.
         * XXX Needs more robustness.
         */

        if (ia->ia_nio < 1)
                return (0);
        if (ia->ia_nirq < 1)
                return (0);

        /* Disallow wildcarded i/o address. */
        if (ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT)
                return (0);
        if (ia->ia_irq[0].ir_irq == ISA_UNKNOWN_IRQ)
                return (0);

        /* if the first port is in use as console, then it. */
        if (com_is_console(iot, ia->ia_io[0].ir_addr, 0))
                goto checkmappings;

        if (bus_space_map(iot, ia->ia_io[0].ir_addr, COM_NPORTS, 0, &ioh)) {
                rv = 0;
                goto out;
        }
        rv = comprobe1(iot, ioh);
        bus_space_unmap(iot, ioh, COM_NPORTS);
        if (rv == 0)
                goto out;

checkmappings:
        for (i = 1, iobase = ia->ia_io[0].ir_addr; i < NSLAVES; i++) {
                iobase += COM_NPORTS;

                if (com_is_console(iot, iobase, 0))
                        continue;

                if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) {
                        rv = 0;
                        goto out;
                }
                bus_space_unmap(iot, ioh, COM_NPORTS);
        }

out:
        if (rv) {
                ia->ia_nio = 1;
                ia->ia_io[0].ir_size = NSLAVES * COM_NPORTS;

                ia->ia_nirq = 1;

                ia->ia_niomem = 0;
                ia->ia_ndrq = 0;
        }
        return (rv);
}

void
rtfpsattach(device_t parent, device_t self, void *aux)
{
        struct rtfps_softc *sc = device_private(self);
        struct isa_attach_args *ia = aux;
        struct commulti_attach_args ca;
        static int irqport[] = {
                -1, -1, -1, -1, -1, -1, -1, -1,
                -1, 0x2f2, 0x6f2, 0x6f3, -1, -1, -1, -1
        };
        bus_space_tag_t iot = ia->ia_iot;
        int i, iobase, irq;

        aprint_naive("\n");
        aprint_normal("\n");

        sc->sc_iot = ia->ia_iot;
        sc->sc_iobase = ia->ia_io[0].ir_addr;
        irq = ia->ia_irq[0].ir_irq;

        if (irq >= 16 || irqport[irq] == -1) {
                aprint_error_dev(self, "invalid irq\n");
                return;
        }
        sc->sc_irqport = irqport[irq];

        for (i = 0; i < NSLAVES; i++) {
                iobase = sc->sc_iobase + i * COM_NPORTS;
                if (!com_is_console(iot, iobase, &sc->sc_slaveioh[i]) &&
                    bus_space_map(iot, iobase, COM_NPORTS, 0,
                        &sc->sc_slaveioh[i])) {
                        aprint_error_dev(self,
                            "can't map i/o space for slave %d\n", i);
                        return;
                }
        }
        if (bus_space_map(iot, sc->sc_irqport, 1, 0, &sc->sc_irqioh)) {
                aprint_error_dev(self, "can't map irq port at 0x%x\n",
                    sc->sc_irqport);
                return;
        }

        bus_space_write_1(iot, sc->sc_irqioh, 0, 0);

        for (i = 0; i < NSLAVES; i++) {
                ca.ca_slave = i;
                ca.ca_iot = sc->sc_iot;
                ca.ca_ioh = sc->sc_slaveioh[i];
                ca.ca_iobase = sc->sc_iobase + i * COM_NPORTS;
                ca.ca_noien = 0;

                sc->sc_slaves[i] = config_found(self, &ca, commultiprint,
                    CFARGS_NONE);
                if (sc->sc_slaves[i] != NULL)
                        sc->sc_alive |= 1 << i;
        }

        sc->sc_ih = isa_intr_establish(ia->ia_ic, irq, IST_EDGE,
            IPL_SERIAL, rtfpsintr, sc);
}

int
rtfpsintr(void *arg)
{
        struct rtfps_softc *sc = arg;
        bus_space_tag_t iot = sc->sc_iot;
        int alive = sc->sc_alive;

        bus_space_write_1(iot, sc->sc_irqioh, 0, 0);

#define TRY(n) \
        if (alive & (1 << (n))) \
                comintr(sc->sc_slaves[n]);
        TRY(0);
        TRY(1);
        TRY(2);
        TRY(3);
#undef TRY

        return (1);
}