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

/*
 * Copyright (c) 1995, 1996, 1997 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: pci_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 <dev/ata/atavar.h>
#include <dev/pci/pcivar.h>
#include <dev/scsipi/scsiconf.h>

#include <dev/ic/mlxio.h>               /* XXX */
#include <dev/ic/mlxvar.h>              /* XXX */

#include <dev/i2o/i2o.h>                /* XXX */
#include <dev/i2o/iopio.h>              /* XXX */
#include <dev/i2o/iopvar.h>             /* XXX */

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

void
pci_find_bootdev(device_t hosedev, device_t dev, void *aux)
{
        static device_t pcidev, ctrlrdev;
        struct bootdev_data *b = bootdev_data;
        device_t parent = device_parent(dev);

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

        if (pcidev == NULL) {
                if (device_is_a(dev, "pci")) {
                        struct pcibus_attach_args *pba = aux;

                        /*
                         * If a hose device was specified, ensure that
                         * this PCI instance has that device as an ancestor.
                         */
                        if (hosedev) {
                                while (parent) {
                                        if (parent == hosedev) {
                                                break;
                                        }
                                        parent = device_parent(parent);
                                }
                                if (!parent) {
                                        return;
                                }
                        }
                        if ((b->slot / 1000) == pba->pba_bus) {
                                pcidev = dev;
                                DPRINTF(("\npcidev = %s\n", device_xname(dev)));
                        }
                }
                return;
        }

        if (ctrlrdev == NULL) {
                if (parent == pcidev) {
                        struct pci_attach_args *pa = aux;
                        int slot = pa->pa_bus * 1000 + pa->pa_function * 100 +
                            pa->pa_device;

                        if (b->slot == slot) {
                                if (bootdev_is_net) {
                                        goto foundit;
                                } else {
                                        ctrlrdev = dev;
                                        DPRINTF(("\nctrlrdev = %s\n",
                                            device_xname(dev)));
                                }
                        }
                }
                return;
        }

        if (!bootdev_is_disk) {
                return;
        }

        if (device_is_a(dev, "sd") ||
            device_is_a(dev, "st") ||
            device_is_a(dev, "cd")) {
                struct scsipibus_attach_args *sa = aux;
                struct scsipi_periph *periph = sa->sa_periph;
                int unit;

                if (device_parent(parent) != ctrlrdev) {
                        return;
                }

                unit = periph->periph_target * 100 + periph->periph_lun;
                if (b->unit != unit ||
                    b->channel != periph->periph_channel->chan_channel) {
                        return;
                }
                goto foundit;
        }

        if (device_is_a(dev, "wd")) {
                struct ata_device *adev = aux;

                if (!device_is_a(parent, "atabus")) {
                        return;
                }
                if (device_parent(parent) != ctrlrdev) {
                        return;
                }

                DPRINTF(("\natapi info: drive %d, channel %d\n",
                    adev->adev_drv_data->drive, adev->adev_channel));
                DPRINTF(("bootdev info: unit: %d, channel: %d\n",
                    b->unit, b->channel));
                if (b->unit != adev->adev_drv_data->drive ||
                    b->channel != adev->adev_channel) {
                        return;
                }
                goto foundit;
        }

        if (device_is_a(dev, "ld")) {
                /*
                 * XXX Attach arguments for ld devices is not consistent,
                 * XXX so we have to special-case each supported RAID
                 * XXX controller.
                 */
                if (parent != ctrlrdev) {
                        return;
                }

                if (device_is_a(parent, "mlx")) {
                        struct mlx_attach_args *mlxa = aux;

                        if (b->unit != mlxa->mlxa_unit) {
                                return;
                        }
                        goto foundit;
                }

                if (device_is_a(parent, "iop")) {
                        struct iop_attach_args *iopa = aux;

                        if (b->unit != iopa->ia_tid) {
                                return;
                        }
                        goto foundit;
                }
        }

        return;

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