/* $NetBSD: tc_bootdev.c,v 1.1 2025/03/09 01:06:42 thorpej Exp $ */

/*
 * Copyright (c) 1995, 1996 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Author: Chris G. Demetriou
 *
 * Permission to use, copy, modify and distribute this software and
 * its documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 */

#include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */

__KERNEL_RCSID(0, "$NetBSD: tc_bootdev.c,v 1.1 2025/03/09 01:06:42 thorpej Exp $");

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

#include <machine/alpha.h>
#include <machine/autoconf.h>
#include <machine/rpb.h>

#include <dev/scsipi/scsiconf.h>

#include <dev/tc/tcvar.h>
#include <dev/tc/tcdsvar.h>

#define DPRINTF(x)      if (bootdev_debug) printf x

static inline int
tc_ioasic_slot(void)
{
        /* 5 on 3000/300, 7 on everything else. */
        return cputype == ST_DEC_3000_300 ? 5 : 7;
}

void
tc_find_bootdev(device_t dev, void *aux)
{
        static device_t scsidev, tcdsdev;
        struct bootdev_data *b = bootdev_data;
        device_t parent = device_parent(dev);

        if (booted_device != NULL || b == NULL) {
                return;
        }

        /*
         * For SCSI boot, we look for "tcds", make sure it has the
         * right slot number, then find the "asc" on this tcds that
         * has the right channel.  Then we find the actual SCSI
         * device we came from.  NOTE: No SCSI LUN support (yet).
         */
        if (bootdev_is_disk) {
                if (tcdsdev == NULL) {
                        if (device_is_a(dev, "tcds")) {
                                struct tc_attach_args *tcargs = aux;

                                if (b->slot == tcargs->ta_slot) {
                                        tcdsdev = dev;
                                        DPRINTF(("\ntcdsdev = %s\n",
                                            device_xname(dev)));
                                }
                        }
                        return;
                }
                if (scsidev == NULL) {
                        if (device_is_a(dev, "asc")) {
                                struct tcdsdev_attach_args *ta = aux;

                                if (parent == tcdsdev &&
                                    b->channel == ta->tcdsda_chip) {
                                        scsidev = dev;
                                        DPRINTF(("\nscsidev = %s\n",
                                            device_xname(dev)));
                                }
                        }
                        return;
                }
                if (device_is_a(dev, "sd") ||
                    device_is_a(dev, "st") ||
                    device_is_a(dev, "cd")) {
                        struct scsipibus_attach_args *sa = aux;

                        if (device_parent(parent) != scsidev ||
                            b->unit / 100 != sa->sa_periph->periph_target) {
                                return;
                        }

                        /* XXX LUN */

                        switch (b->boot_dev_type) {
                        case 0:
                                if (!device_is_a(dev, "sd") &&
                                    !device_is_a(dev, "cd")) {
                                        return;
                                }
                                break;

                        case 1:
                                if (!device_is_a(dev, "st")) {
                                        return;
                                }
                                break;

                        default:
                                return;
                        }
                        goto foundit;
                }
        }

        if (bootdev_is_net) {
                if (device_is_a(dev, "le") &&
                    device_is_a(parent, "ioasic") &&
                    b->slot == tc_ioasic_slot()) {
                        /*
                         * No need to check ioasic_attach_args, since only
                         * one le on ioasic.
                         */
                        goto foundit;
                }

                /*
                 * XXX GENERIC SUPPORT FOR TC NETWORK BOARDS
                 */
        }

        return;

 foundit:
        booted_device = dev;
        DPRINTF(("\nbooted_device = %s\n", device_xname(dev)));
}