/*      $NetBSD: mainbus.c,v 1.9 2025/10/19 20:52:09 thorpej Exp $      */

/*-
 * Copyright (c) 2007 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Tim Rightnour
 *
 * 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mainbus.c,v 1.9 2025/10/19 20:52:09 thorpej Exp $");

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

#include <machine/autoconf.h>
#include <powerpc/pio.h>

#include "mca.h"

#if NMCA > 0
#include <dev/mca/mcavar.h>
#endif

int     mainbus_match(device_t, cfdata_t, void *);
void    mainbus_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(mainbus, 0,
    mainbus_match, mainbus_attach, NULL, NULL);

int     mainbus_print(void *, const char *);

union mainbus_attach_args {
        const char *mba_busname;                /* first elem of all */
#if NMCA > 0
        struct mcabus_attach_args mba_mba;
#endif
};

/* There can be only one. */
int mainbus_found = 0;

/*
 * Probe for the mainbus; always succeeds.
 */
int
mainbus_match(device_t parent, cfdata_t match, void *aux)
{

        if (mainbus_found)
                return 0;
        return 1;
}

/*
 * Attach the mainbus.
 */
void
mainbus_attach(device_t parent, device_t self, void *aux)
{
        union mainbus_attach_args mba;
        struct confargs ca;
#if DEBUG
        int slot;
#endif
        mainbus_found = 1;

        aprint_normal("\n");

        ca.ca_name = "cpu";
        ca.ca_node = 0;
        config_found(self, &ca, mainbus_print,
            CFARGS(.iattr = "mainbus"));

#if DEBUG
        printf("scanning MCA bus\n");
        for (slot=0; slot < 16; slot++) {
                printf("slot %d == %x%x\n", slot,
                    inb(0xc0400100 + 1 + (slot<<16)),
                    inb(0xc0400100 + 0 + (slot<<16)));
        }
        printf("done\n");

        printf(" CFG reg (1)= %x\n", inl(0xc0010080));
        printf(" TCE reg (1)= %x\n", inl(0xc001009c));
#endif

        mba.mba_mba.mba_iot = &rs6000_iocc0_io_space_tag;
        mba.mba_mba.mba_memt = &rs6000_iocc0_io_space_tag; /* XXX ??? */
        mba.mba_mba.mba_dmat = NULL; /*&mca_bus_dma_tag;*/
        mba.mba_mba.mba_mc = NULL;
        mba.mba_mba.mba_bus = 0;
        mcabus_attach(self, &mba.mba_mba);
}

int
mainbus_print(void *aux, const char *pnp)
{
        union mainbus_attach_args *mba = aux;

        if (pnp)
                aprint_normal("%s at %s", mba->mba_busname, pnp);

        return (UNCONF);
}