/*      $OpenBSD: mpu_isa.c,v 1.8 2022/04/06 18:59:28 naddy Exp $       */

/*
 * Copyright (c) 2002 Sergey Smitienko. 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. 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 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.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/syslog.h>
#include <sys/device.h>

#include <machine/bus.h>

#include <sys/audioio.h>
#include <dev/midi_if.h>

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

#include <dev/ic/mpuvar.h>

int     mpu_isa_match(struct device *, void *, void *);
void    mpu_isa_attach(struct device *, struct device *, void *);
int     mpu_test(bus_space_tag_t, int);

#ifdef  AUDIO_DEBUG
#define DPRINTF(x)      if (mpu_debug) printf x
int     mpu_debug = 0;
#else
#define DPRINTF(x)
#endif

#define MPU_GETSTATUS(iot, ioh) (bus_space_read_1(iot, ioh, MPU_STATUS))

struct mpu_isa_softc {
        struct device sc_dev;

        struct mpu_softc sc_mpu;
};

const struct cfattach mpu_isa_ca = {
        sizeof(struct mpu_isa_softc), mpu_isa_match, mpu_isa_attach
};

int
mpu_test(bus_space_tag_t iot, int iobase)       /* base port number to try */
{
        bus_space_handle_t ioh;
        int     i, rc;

        rc = 0;
        if (bus_space_map(iot, iobase, MPU401_NPORT, 0, &ioh)) {
                DPRINTF(("mpu_test: can't map: %x/2\n", iobase));
                return (0);
        }

        DPRINTF(("mpu_test: trying: %x\n", iobase));

        /*
         * The following code is a shameless copy of mpu401.c
         * it is here until a redesign of mpu_find() interface
         */

        if (MPU_GETSTATUS(iot, ioh) == 0xff)
                goto done;

        for (i = 0; i < MPU_MAXWAIT; i++) {
                if (!(MPU_GETSTATUS(iot, ioh) & MPU_OUTPUT_BUSY)) {
                        rc = 1;
                        break;
                }
                delay (10);
        }
        
        if (rc == 1) {  
                bus_space_write_1(iot, ioh, MPU_COMMAND, MPU_RESET);
                rc = 0;
                for (i = 0; i < 2 * MPU_MAXWAIT; i++)
                        if (!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY) &&
                            bus_space_read_1(iot, ioh, MPU_DATA) == MPU_ACK) {
                                rc = 1;
                                break;
                        }
        }
done:
        bus_space_unmap(iot, ioh, MPU401_NPORT);

        return (rc);
}

int
mpu_isa_match(struct device *parent, void *match, void *aux)
{
        struct isa_attach_args *ia = aux;

        if (mpu_test(ia->ia_iot, ia->ia_iobase)) {
                ia->ia_iosize = MPU401_NPORT;
                return (1);
        }

        return (0);
}

void
mpu_isa_attach(struct device *parent, struct device *self, void *aux)
{
        struct mpu_isa_softc *sc = (struct mpu_isa_softc *)self;
        struct isa_attach_args *ia = aux;

        sc->sc_mpu.iot = ia->ia_iot;

        if (bus_space_map (ia->ia_iot, ia->ia_iobase, MPU401_NPORT,
            0, &sc->sc_mpu.ioh)) {
                printf(": can't map i/o space\n");
                return;
        }

        if (!mpu_find(&sc->sc_mpu)) {
                printf(": find failed\n");
                return;
        }

        printf(": generic MPU-401 compatible\n");

        midi_attach_mi(&mpu_midi_hw_if, &sc->sc_mpu, &sc->sc_dev);
}