/*      $NetBSD: fd.c,v 1.119 2025/12/20 10:51:05 skrll Exp $   */

/*-
 * Copyright (c) 1998, 2003, 2008 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Charles M. Hannum.
 *
 * 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.
 */

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Don Ahn.
 *
 * 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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *      @(#)fd.c        7.4 (Berkeley) 5/25/91
 */

/*
 * Floppy formatting facilities merged from FreeBSD fd.c driver:
 *      Id: fd.c,v 1.53 1995/03/12 22:40:56 joerg Exp
 * which carries the same copyright/redistribution notice as shown above with
 * the addition of the following statement before the "Redistribution and
 * use ..." clause:
 *
 * Copyright (c) 1993, 1994 by
 *  jc@irbs.UUCP (John Capo)
 *  vak@zebub.msk.su (Serge Vakulenko)
 *  ache@astral.msk.su (Andrew A. Chernov)
 *
 * Copyright (c) 1993, 1994, 1995 by
 *  joerg_wunsch@uriah.sax.de (Joerg Wunsch)
 *  dufault@hda.com (Peter Dufault)
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: fd.c,v 1.119 2025/12/20 10:51:05 skrll Exp $");

#include "opt_ddb.h"

/*
 * XXX This driver should be properly MI'd some day, but this allows us
 * XXX to eliminate a lot of code duplication for now.
 */
#if !defined(alpha) && !defined(algor) && !defined(atari) && \
    !defined(bebox) && !defined(evbmips) && !defined(i386) && \
    !defined(prep) && !defined(sandpoint) && !defined(x86_64) && \
    !defined(mvmeppc) && !defined(ofppc)
#error platform not supported by this driver, yet
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/device.h>
#include <sys/disklabel.h>
#include <sys/disk.h>
#include <sys/buf.h>
#include <sys/bufq.h>
#include <sys/kmem.h>
#include <sys/uio.h>
#include <sys/syslog.h>
#include <sys/queue.h>
#include <sys/proc.h>
#include <sys/fdio.h>
#include <sys/conf.h>
#include <sys/vnode.h>
#include <sys/rndsource.h>

#include <prop/proplib.h>

#include <dev/cons.h>

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

#include "locators.h"

#if defined(atari)
/*
 * On the atari, it is configured as fdcisa
 */
#define FDCCF_DRIVE             FDCISACF_DRIVE
#define FDCCF_DRIVE_DEFAULT     FDCISACF_DRIVE_DEFAULT

#define fd_cd   fdisa_cd
#endif /* atari */

#include <sys/intr.h>

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

#include <dev/isa/fdreg.h>
#include <dev/isa/fdcvar.h>

#if defined(i386) || defined(x86_64)

#include <dev/ic/mc146818reg.h>                 /* for NVRAM access */
#include <i386/isa/nvram.h>

#if defined(i386)
#include "mca.h"
#if NMCA > 0
#include <machine/mca_machdep.h>                /* for MCA_system */
#endif
#endif

#endif /* i386 || x86_64 */

#include <dev/isa/fdvar.h>

#define FDUNIT(dev)     (minor(dev) / 8)
#define FDTYPE(dev)     (minor(dev) % 8)

/* (mis)use device use flag to identify format operation */
#define B_FORMAT B_DEVPRIVATE

/* controller driver configuration */
int fdprint(void *, const char *);

#if NMCA > 0
/* MCA - specific entries */
const struct fd_type mca_fd_types[] = {
        { 18,2,36,2,0xff,0x0f,0x1b,0x6c,80,2880,1,FDC_500KBPS,0xf6,1, "1.44MB"    }, /* 1.44MB diskette - XXX try 16ms step rate */
        {  9,2,18,2,0xff,0x4f,0x2a,0x50,80,1440,1,FDC_250KBPS,0xf6,1, "720KB"    }, /* 3.5 inch 720kB diskette - XXX try 24ms step rate */
};
#endif /* NMCA > 0 */

/* The order of entries in the following table is important -- BEWARE! */

#if defined(atari)
const struct fd_type fd_types[] = {
        {  9,2,18,2,0xff,0xdf,0x2a,0x50,40, 720,1,FDC_250KBPS,0xf6,1, "360KB/PC" }, /* 360kB PC diskettes */
        {  9,2,18,2,0xff,0xdf,0x2a,0x50,80,1440,1,FDC_250KBPS,0xf6,1, "720KB"    }, /* 3.5 inch 720kB diskette */
        { 18,2,36,2,0xff,0xcf,0x1b,0x6c,80,2880,1,FDC_500KBPS,0xf6,1, "1.44MB"   }, /* 1.44MB diskette */
};
#else
const struct fd_type fd_types[] = {
        { 18,2,36,2,0xff,0xcf,0x1b,0x6c,80,2880,1,FDC_500KBPS,0xf6,1, "1.44MB"   }, /* 1.44MB diskette */
        { 15,2,30,2,0xff,0xdf,0x1b,0x54,80,2400,1,FDC_500KBPS,0xf6,1, "1.2MB"    }, /* 1.2 MB AT-diskettes */
        {  9,2,18,2,0xff,0xdf,0x23,0x50,40, 720,2,FDC_300KBPS,0xf6,1, "360KB/AT" }, /* 360kB in 1.2MB drive */
        {  9,2,18,2,0xff,0xdf,0x2a,0x50,40, 720,1,FDC_250KBPS,0xf6,1, "360KB/PC" }, /* 360kB PC diskettes */
        {  9,2,18,2,0xff,0xdf,0x2a,0x50,80,1440,1,FDC_250KBPS,0xf6,1, "720KB"    }, /* 3.5 inch 720kB diskette */
        {  9,2,18,2,0xff,0xdf,0x23,0x50,80,1440,1,FDC_300KBPS,0xf6,1, "720KB/x"  }, /* 720kB in 1.2MB drive */
        {  9,2,18,2,0xff,0xdf,0x2a,0x50,40, 720,2,FDC_250KBPS,0xf6,1, "360KB/x"  }, /* 360kB in 720kB drive */
};
#endif /* defined(atari) */

void fdcfinishattach(device_t);
int fdprobe(device_t, cfdata_t, void *);
void fdattach(device_t, device_t, void *);
static int fddetach(device_t, int);
static int fdcintr1(struct fdc_softc *);
static void fdcintrcb(void *);
static bool fdcsuspend(device_t, const pmf_qual_t *);
static bool fdcresume(device_t, const pmf_qual_t *);

extern struct cfdriver fd_cd;

#ifdef atari
CFATTACH_DECL_NEW(fdisa, sizeof(struct fd_softc),
    fdprobe, fdattach, fddetach, NULL);
#else
CFATTACH_DECL_NEW(fd, sizeof(struct fd_softc),
    fdprobe, fdattach, fddetach, NULL);
#endif

dev_type_open(fdopen);
dev_type_close(fdclose);
dev_type_read(fdread);
dev_type_write(fdwrite);
dev_type_ioctl(fdioctl);
dev_type_strategy(fdstrategy);

const struct bdevsw fd_bdevsw = {
        .d_open = fdopen,
        .d_close = fdclose,
        .d_strategy = fdstrategy,
        .d_ioctl = fdioctl,
        .d_dump = nodump,
        .d_psize = nosize,
        .d_discard = nodiscard,
        .d_flag = D_DISK
};

const struct cdevsw fd_cdevsw = {
        .d_open = fdopen,
        .d_close = fdclose,
        .d_read = fdread,
        .d_write = fdwrite,
        .d_ioctl = fdioctl,
        .d_stop = nostop,
        .d_tty = notty,
        .d_poll = nopoll,
        .d_mmap = nommap,
        .d_kqfilter = nokqfilter,
        .d_discard = nodiscard,
        .d_flag = D_DISK
};

void fdgetdisklabel(struct fd_softc *);
int fd_get_parms(struct fd_softc *);
void fdstart(struct fd_softc *);

struct dkdriver fddkdriver = {
        .d_strategy = fdstrategy,
        .d_minphys = minphys
};

#if defined(i386) || defined(x86_64)
const struct fd_type *fd_nvtotype(const char *, int, int);
#endif /* i386 || x86_64 */
void fd_set_motor(struct fdc_softc *fdc, int reset);
void fd_motor_off(void *arg);
void fd_motor_on(void *arg);
int fdcresult(struct fdc_softc *fdc);
void fdcstart(struct fdc_softc *fdc);
void fdcstatus(device_t, int, const char *);
void fdctimeout(void *arg);
void fdcretry(struct fdc_softc *fdc);
void fdfinish(struct fd_softc *fd, struct buf *bp);
static const struct fd_type *fd_dev_to_type(struct fd_softc *, dev_t);
int fdformat(dev_t, struct ne7_fd_formb *, struct lwp *);
static void fd_set_geometry(struct fd_softc *fd);

void    fd_mountroot_hook(device_t);

/*
 * Arguments passed between fdcattach and fdprobe.
 */
struct fdc_attach_args {
        int fa_drive;
        const struct fd_type *fa_deftype;
};

/*
 * Print the location of a disk drive (called just before attaching the
 * the drive).  If `fdc' is not NULL, the drive was found but was not
 * in the system config file; print the drive name as well.
 * Return QUIET (config_find ignores this if the device was configured) to
 * avoid printing `fdN not configured' messages.
 */
int
fdprint(void *aux, const char *fdc)
{
        struct fdc_attach_args *fa = aux;

        if (!fdc)
                aprint_normal(" drive %d", fa->fa_drive);
        return QUIET;
}

static bool
fdcresume(device_t self, const pmf_qual_t *qual)
{
        struct fdc_softc *fdc = device_private(self);

        mutex_enter(&fdc->sc_mtx);
        (void)fdcintr1(fdc);
        mutex_exit(&fdc->sc_mtx);
        return true;
}

static bool
fdcsuspend(device_t self, const pmf_qual_t *qual)
{
        struct fdc_softc *fdc = device_private(self);
        int drive;
        struct fd_softc *fd;

        mutex_enter(&fdc->sc_mtx);
        while (fdc->sc_state != DEVIDLE)
                cv_wait(&fdc->sc_cv, &fdc->sc_mtx);
        for (drive = 0; drive < 4; drive++) {
                if ((fd = fdc->sc_fd[drive]) == NULL)
                        continue;
                fd->sc_flags &= ~(FD_MOTOR|FD_MOTOR_WAIT);
        }
        fd_set_motor(fdc, 0);
        mutex_exit(&fdc->sc_mtx);
        return true;
}

void
fdc_childdet(device_t self, device_t child)
{
        struct fdc_softc *fdc = device_private(self);
        struct fd_softc *fd = device_private(child);
        int drive = fd->sc_drive;

        KASSERT(fdc->sc_fd[drive] == fd); /* but the kid is not my son */
        fdc->sc_fd[drive] = NULL;
}

int
fdcdetach(device_t self, int flags)
{
        int rc;
        struct fdc_softc *fdc = device_private(self);

        if ((rc = config_detach_children(self, flags)) != 0)
                return rc;

        pmf_device_deregister(self);

        isa_dmamap_destroy(fdc->sc_ic, fdc->sc_drq);
        isa_drq_free(fdc->sc_ic, fdc->sc_drq);

        callout_destroy(&fdc->sc_intr_ch);
        callout_destroy(&fdc->sc_timo_ch);

        cv_destroy(&fdc->sc_cv);
        mutex_destroy(&fdc->sc_mtx);

        return 0;
}

void
fdcattach(struct fdc_softc *fdc)
{
        mutex_init(&fdc->sc_mtx, MUTEX_DEFAULT, IPL_BIO);
        cv_init(&fdc->sc_cv, "fdcwake");
        callout_init(&fdc->sc_timo_ch, 0);
        callout_init(&fdc->sc_intr_ch, 0);

        fdc->sc_state = DEVIDLE;
        TAILQ_INIT(&fdc->sc_drives);

        fdc->sc_maxiosize = isa_dmamaxsize(fdc->sc_ic, fdc->sc_drq);

        if (isa_drq_alloc(fdc->sc_ic, fdc->sc_drq) != 0) {
                aprint_normal_dev(fdc->sc_dev, "can't reserve drq %d\n",
                    fdc->sc_drq);
                return;
        }

        if (isa_dmamap_create(fdc->sc_ic, fdc->sc_drq, fdc->sc_maxiosize,
            BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW)) {
                aprint_normal_dev(fdc->sc_dev, "can't set up ISA DMA map\n");
                return;
        }

        config_interrupts(fdc->sc_dev, fdcfinishattach);

        if (!pmf_device_register(fdc->sc_dev, fdcsuspend, fdcresume)) {
                aprint_error_dev(fdc->sc_dev,
                    "cannot set power mgmt handler\n");
        }
}

void
fdcfinishattach(device_t self)
{
        struct fdc_softc *fdc = device_private(self);
        bus_space_tag_t iot = fdc->sc_iot;
        bus_space_handle_t ioh = fdc->sc_ioh;
        struct fdc_attach_args fa;

        /*
         * Reset the controller to get it into a known state. Not all
         * probes necessarily need do this to discover the controller up
         * front, so don't assume anything.
         */

        bus_space_write_1(iot, ioh, fdout, 0);
        delay(100);
        bus_space_write_1(iot, ioh, fdout, FDO_FRST);

        /* see if it can handle a command */
        if (out_fdc(iot, ioh, NE7CMD_SPECIFY) < 0) {
                aprint_normal_dev(fdc->sc_dev, "can't reset controller\n");
                return;
        }
        out_fdc(iot, ioh, 0xdf);
        out_fdc(iot, ioh, 2);

#if defined(i386) || defined(x86_64)
        /*
         * The NVRAM info only tells us about the first two disks on the
         * `primary' floppy controller.
         */
        /* XXX device_unit() abuse */
        if (device_unit(fdc->sc_dev) == 0) {
                int type = mc146818_read(NULL, NVRAM_DISKETTE); /* XXX softc */
                fdc->sc_known = 1;
                fdc->sc_knownfds[0] = fd_nvtotype(device_xname(fdc->sc_dev),
                    type, 0);
                if (fdc->sc_knownfds[0] != NULL)
                        fdc->sc_present |= 1;
                fdc->sc_knownfds[1] = fd_nvtotype(device_xname(fdc->sc_dev),
                    type, 1);
                if (fdc->sc_knownfds[1] != NULL)
                        fdc->sc_present |= 2;
        }
#endif /* i386 || x86_64 */

        /* physical limit: four drives per controller. */
        fdc->sc_state = PROBING;
        for (fa.fa_drive = 0; fa.fa_drive < 4; fa.fa_drive++) {
                if (fdc->sc_known) {
                        if (fdc->sc_present & (1 << fa.fa_drive)) {
                                fa.fa_deftype = fdc->sc_knownfds[fa.fa_drive];
                                config_found(fdc->sc_dev, (void *)&fa,
                                    fdprint, CFARGS_NONE);
                        }
                } else {
#if defined(atari)
                        /*
                         * Atari has a different ordening, defaults to 1.44
                         */
                        fa.fa_deftype = &fd_types[2];
                         /* Atari also configures ISA fdc(4) as "fdcisa" */
                        config_found(fdc->sc_dev, &fa, fdprint,
                            CFARGS(.iattr = "fdcisa"));
#else
                        /*
                         * Default to 1.44MB on Alpha and BeBox.  How do we tell
                         * on these platforms?
                         */
                        fa.fa_deftype = &fd_types[0];
                        config_found(fdc->sc_dev, &fa, fdprint,
                            CFARGS(.iattr = "fdc"));
#endif
                }
        }
        fdc->sc_state = DEVIDLE;
}

int
fdprobe(device_t parent, cfdata_t match, void *aux)
{
        struct fdc_softc *fdc = device_private(parent);
        cfdata_t cf = match;
        struct fdc_attach_args *fa = aux;
        int drive = fa->fa_drive;
        bus_space_tag_t iot = fdc->sc_iot;
        bus_space_handle_t ioh = fdc->sc_ioh;
        int n;

        if (cf->cf_loc[FDCCF_DRIVE] != FDCCF_DRIVE_DEFAULT &&
            cf->cf_loc[FDCCF_DRIVE] != drive)
                return 0;
        /*
         * XXX
         * This is to work around some odd interactions between this driver
         * and SMC Ethernet cards.
         */
        if (cf->cf_loc[FDCCF_DRIVE] == FDCCF_DRIVE_DEFAULT && drive >= 2)
                return 0;

        /* Use PNP information if available */
        if (fdc->sc_known)
                return 1;

        mutex_enter(&fdc->sc_mtx);
        /* toss any interrupt status */
        for (n = 0; n < 4; n++) {
                out_fdc(iot, ioh, NE7CMD_SENSEI);
                (void) fdcresult(fdc);
        }
        /* select drive and turn on motor */
        bus_space_write_1(iot, ioh, fdout, drive | FDO_FRST | FDO_MOEN(drive));
        /* wait for motor to spin up */
        /* XXX check sc_probe */
        (void) cv_timedwait(&fdc->sc_cv, &fdc->sc_mtx, hz / 4);
        out_fdc(iot, ioh, NE7CMD_RECAL);
        out_fdc(iot, ioh, drive);
        /* wait for recalibrate, up to 2s */
        /* XXX check sc_probe */
        if (cv_timedwait(&fdc->sc_cv, &fdc->sc_mtx, 2 * hz) != EWOULDBLOCK){
#ifdef FD_DEBUG
                /* XXX */
                printf("fdprobe: got intr\n");
#endif
        }
        out_fdc(iot, ioh, NE7CMD_SENSEI);
        n = fdcresult(fdc);
#ifdef FD_DEBUG
        {
                int i;
                printf("fdprobe: status");
                for (i = 0; i < n; i++)
                        printf(" %x", fdc->sc_status[i]);
                printf("\n");
        }
#endif
        /* turn off motor */
        bus_space_write_1(iot, ioh, fdout, FDO_FRST);
        mutex_exit(&fdc->sc_mtx);

#if defined(bebox)      /* XXX What is this about? --thorpej@NetBSD.org */
        if (n != 2 || (fdc->sc_status[1] != 0))
                return 0;
#else
        if (n != 2 || (fdc->sc_status[0] & 0xf8) != 0x20)
                return 0;
#endif /* bebox */

        return 1;
}

/*
 * Controller is working, and drive responded.  Attach it.
 */
void
fdattach(device_t parent, device_t self, void *aux)
{
        struct fdc_softc *fdc = device_private(parent);
        struct fd_softc *fd = device_private(self);
        struct fdc_attach_args *fa = aux;
        const struct fd_type *type = fa->fa_deftype;
        int drive = fa->fa_drive;

        fd->sc_dev = self;

        callout_init(&fd->sc_motoron_ch, 0);
        callout_init(&fd->sc_motoroff_ch, 0);

        /* XXX Allow `flags' to override device type? */

        if (type)
                aprint_normal(": %s, %d cyl, %d head, %d sec\n", type->name,
                    type->cyls, type->heads, type->sectrac);
        else
                aprint_normal(": density unknown\n");

        bufq_alloc(&fd->sc_q, "disksort", BUFQ_SORT_CYLINDER);
        fd->sc_cylin = -1;
        fd->sc_drive = drive;
        fd->sc_deftype = type;
        fdc->sc_fd[drive] = fd;

        /*
         * Initialize and attach the disk structure.
         */
        disk_init(&fd->sc_dk, device_xname(fd->sc_dev), &fddkdriver);
        disk_attach(&fd->sc_dk);

        /*
         * Establish a mountroot hook.
         */
        fd->sc_roothook =
            mountroothook_establish(fd_mountroot_hook, fd->sc_dev);

        rnd_attach_source(&fd->rnd_source, device_xname(fd->sc_dev),
                          RND_TYPE_DISK, RND_FLAG_DEFAULT);

        fd_set_geometry(fd);

        if (!pmf_device_register(self, NULL, NULL))
                aprint_error_dev(self, "cannot set power mgmt handler\n");
}

static int
fddetach(device_t self, int flags)
{
        struct fd_softc *fd = device_private(self);
        int bmaj, cmaj, i, mn;

        fd_motor_off(fd);

        /* locate the major number */
        bmaj = bdevsw_lookup_major(&fd_bdevsw);
        cmaj = cdevsw_lookup_major(&fd_cdevsw);

        /* Nuke the vnodes for any open instances. */
        for (i = 0; i < MAXPARTITIONS; i++) {
                mn = DISKMINOR(device_unit(self), i);
                vdevgone(bmaj, mn, mn, VBLK);
                vdevgone(cmaj, mn, mn, VCHR);
        }

        pmf_device_deregister(self);

#if 0 /* XXX need to undo at detach? */
        fd_set_geometry(fd);
#endif

        rnd_detach_source(&fd->rnd_source);

        disk_detach(&fd->sc_dk);
        disk_destroy(&fd->sc_dk);

        /* Kill off any queued buffers. */
        bufq_drain(fd->sc_q);

        bufq_free(fd->sc_q);

        callout_destroy(&fd->sc_motoroff_ch);
        callout_destroy(&fd->sc_motoron_ch);

        return 0;
}

#if defined(i386) || defined(x86_64)
/*
 * Translate nvram type into internal data structure.  Return NULL for
 * none/unknown/unusable.
 */
const struct fd_type *
fd_nvtotype(const char *fdc, int nvraminfo, int drive)
{
        int type;

        type = (drive == 0 ? nvraminfo : nvraminfo << 4) & 0xf0;
        switch (type) {
        case NVRAM_DISKETTE_NONE:
                return NULL;
        case NVRAM_DISKETTE_12M:
                return &fd_types[1];
        case NVRAM_DISKETTE_TYPE5:
        case NVRAM_DISKETTE_TYPE6:
                /* XXX We really ought to handle 2.88MB format. */
        case NVRAM_DISKETTE_144M:
#if NMCA > 0
                if (MCA_system)
                        return &mca_fd_types[0];
                else
#endif /* NMCA > 0 */
                        return &fd_types[0];
        case NVRAM_DISKETTE_360K:
                return &fd_types[3];
        case NVRAM_DISKETTE_720K:
#if NMCA > 0
                if (MCA_system)
                        return &mca_fd_types[1];
                else
#endif /* NMCA > 0 */
                        return &fd_types[4];
        default:
                printf("%s: drive %d: unknown device type 0x%x\n",
                    fdc, drive, type);
                return NULL;
        }
}
#endif /* i386 || x86_64 */

static const struct fd_type *
fd_dev_to_type(struct fd_softc *fd, dev_t dev)
{
        u_int type = FDTYPE(dev);

        if (type > __arraycount(fd_types))
                return NULL;
        return type ? &fd_types[type - 1] : fd->sc_deftype;
}

void
fdstrategy(struct buf *bp)
{
        struct fd_softc *fd = device_lookup_private(&fd_cd, FDUNIT(bp->b_dev));
        struct fdc_softc *fdc = device_private(device_parent(fd->sc_dev));
        int sz;

        /* Valid unit, controller, and request? */
        if (bp->b_blkno < 0 ||
            ((bp->b_bcount % FDC_BSIZE) != 0 &&
             (bp->b_flags & B_FORMAT) == 0)) {
                bp->b_error = EINVAL;
                goto done;
        }

        /* If it's a null transfer, return immediately. */
        if (bp->b_bcount == 0)
                goto done;

        sz = howmany(bp->b_bcount, FDC_BSIZE);

        if (bp->b_blkno + sz > fd->sc_type->size) {
                sz = fd->sc_type->size - bp->b_blkno;
                if (sz == 0) {
                        /* If exactly at end of disk, return EOF. */
                        goto done;
                }
                if (sz < 0) {
                        /* If past end of disk, return EINVAL. */
                        bp->b_error = EINVAL;
                        goto done;
                }
                /* Otherwise, truncate request. */
                bp->b_bcount = sz << DEV_BSHIFT;
        }

        bp->b_rawblkno = bp->b_blkno;
        bp->b_cylinder =
            bp->b_blkno / (FDC_BSIZE / DEV_BSIZE) / fd->sc_type->seccyl;

#ifdef FD_DEBUG
        printf("fdstrategy: b_blkno %llu b_bcount %d blkno %llu cylin %d "
            "sz %d\n", (unsigned long long)bp->b_blkno, bp->b_bcount,
            (unsigned long long)fd->sc_blkno, bp->b_cylinder, sz);
#endif

        /* Queue transfer on drive, activate drive and controller if idle. */
        mutex_enter(&fdc->sc_mtx);
        bufq_put(fd->sc_q, bp);
        callout_stop(&fd->sc_motoroff_ch);              /* a good idea */
        if (fd->sc_active == 0)
                fdstart(fd);
#ifdef DIAGNOSTIC
        else {
                if (fdc->sc_state == DEVIDLE) {
                        printf("fdstrategy: controller inactive\n");
                        fdcstart(fdc);
                }
        }
#endif
        mutex_exit(&fdc->sc_mtx);
        return;

done:
        /* Toss transfer; we're done early. */
        bp->b_resid = bp->b_bcount;
        biodone(bp);
}

void
fdstart(struct fd_softc *fd)
{
        struct fdc_softc *fdc = device_private(device_parent(fd->sc_dev));
        int active = !TAILQ_EMPTY(&fdc->sc_drives);

        KASSERT(mutex_owned(&fdc->sc_mtx));
        /* Link into controller queue. */
        fd->sc_active = 1;
        TAILQ_INSERT_TAIL(&fdc->sc_drives, fd, sc_drivechain);

        /* If controller not already active, start it. */
        if (!active)
                fdcstart(fdc);
}

void
fdfinish(struct fd_softc *fd, struct buf *bp)
{
        struct fdc_softc *fdc = device_private(device_parent(fd->sc_dev));

        /*
         * Move this drive to the end of the queue to give others a `fair'
         * chance.  We only force a switch if N operations are completed while
         * another drive is waiting to be serviced, since there is a long motor
         * startup delay whenever we switch.
         */
        (void)bufq_get(fd->sc_q);
        if (TAILQ_NEXT(fd, sc_drivechain) && ++fd->sc_ops >= 8) {
                fd->sc_ops = 0;
                TAILQ_REMOVE(&fdc->sc_drives, fd, sc_drivechain);
                if (bufq_peek(fd->sc_q) != NULL)
                        TAILQ_INSERT_TAIL(&fdc->sc_drives, fd, sc_drivechain);
                else
                        fd->sc_active = 0;
        }
        bp->b_resid = fd->sc_bcount;
        fd->sc_skip = 0;

        rnd_add_uint32(&fd->rnd_source, bp->b_blkno);

        biodone(bp);
        /* turn off motor 5s from now */
        callout_reset(&fd->sc_motoroff_ch, 5 * hz, fd_motor_off, fd);
        fdc->sc_state = DEVIDLE;
}

int
fdread(dev_t dev, struct uio *uio, int flags)
{

        return (physio(fdstrategy, NULL, dev, B_READ, minphys, uio));
}

int
fdwrite(dev_t dev, struct uio *uio, int flags)
{

        return (physio(fdstrategy, NULL, dev, B_WRITE, minphys, uio));
}

void
fd_set_motor(struct fdc_softc *fdc, int reset)
{
        struct fd_softc *fd;
        u_char status;
        int n;

        if ((fd = TAILQ_FIRST(&fdc->sc_drives)) != NULL)
                status = fd->sc_drive;
        else
                status = 0;
        if (!reset)
                status |= FDO_FRST | FDO_FDMAEN;
        for (n = 0; n < 4; n++)
                if ((fd = fdc->sc_fd[n]) && (fd->sc_flags & FD_MOTOR))
                        status |= FDO_MOEN(n);
        bus_space_write_1(fdc->sc_iot, fdc->sc_ioh, fdout, status);
}

void
fd_motor_off(void *arg)
{
        struct fd_softc *fd = arg;
        struct fdc_softc *fdc;

        fdc = device_private(device_parent(fd->sc_dev));

        mutex_enter(&fdc->sc_mtx);
        fd->sc_flags &= ~(FD_MOTOR | FD_MOTOR_WAIT);
        fd_set_motor(fdc, 0);
        mutex_exit(&fdc->sc_mtx);
}

void
fd_motor_on(void *arg)
{
        struct fd_softc *fd = arg;
        struct fdc_softc *fdc = device_private(device_parent(fd->sc_dev));

        mutex_enter(&fdc->sc_mtx);
        fd->sc_flags &= ~FD_MOTOR_WAIT;
        if (TAILQ_FIRST(&fdc->sc_drives) == fd && fdc->sc_state == MOTORWAIT)
                (void)fdcintr1(fdc);
        mutex_exit(&fdc->sc_mtx);
}

int
fdcresult(struct fdc_softc *fdc)
{
        bus_space_tag_t iot = fdc->sc_iot;
        bus_space_handle_t ioh = fdc->sc_ioh;
        u_char i;
        u_int j = 100000,
              n = 0;

        for (; j; j--) {
                i = bus_space_read_1(iot, ioh, fdsts) &
                    (NE7_DIO | NE7_RQM | NE7_CB);
                if (i == NE7_RQM)
                        return n;
                if (i == (NE7_DIO | NE7_RQM | NE7_CB)) {
                        if (n >= sizeof(fdc->sc_status)) {
                                log(LOG_ERR, "fdcresult: overrun\n");
                                return -1;
                        }
                        fdc->sc_status[n++] =
                            bus_space_read_1(iot, ioh, fddata);
                }
                delay(10);
        }
        log(LOG_ERR, "fdcresult: timeout\n");
        return -1;
}

int
out_fdc(bus_space_tag_t iot, bus_space_handle_t ioh, u_char x)
{
        u_char i;
        u_int j = 100000;

        for (; j; j--) {
                i = bus_space_read_1(iot, ioh, fdsts) &
                    (NE7_DIO | NE7_RQM);
                if (i == NE7_RQM) {
                        bus_space_write_1(iot, ioh, fddata, x);
                        return 0;
                }
                delay(10);
        }
        return -1;
}

int
fdopen(dev_t dev, int flags, int mode, struct lwp *l)
{
        struct fd_softc *fd;
        const struct fd_type *type;

        fd = device_lookup_private(&fd_cd, FDUNIT(dev));
        if (fd == NULL)
                return (ENXIO);

        type = fd_dev_to_type(fd, dev);
        if (type == NULL)
                return ENXIO;

        if ((fd->sc_flags & FD_OPEN) != 0 &&
            memcmp(fd->sc_type, type, sizeof(*type)))
                return EBUSY;

        fd->sc_type_copy = *type;
        fd->sc_type = &fd->sc_type_copy;
        fd->sc_cylin = -1;
        fd->sc_flags |= FD_OPEN;

        fd_set_geometry(fd);

        return 0;
}

int
fdclose(dev_t dev, int flags, int mode, struct lwp *l)
{
        struct fd_softc *fd =
            device_lookup_private(&fd_cd, FDUNIT(dev));

        fd->sc_flags &= ~FD_OPEN;
        fd->sc_opts &= ~(FDOPT_NORETRY|FDOPT_SILENT);
        return 0;
}

void
fdcstart(struct fdc_softc *fdc)
{

        KASSERT(mutex_owned(&fdc->sc_mtx));

        if (!device_is_active(fdc->sc_dev))
                return;

#ifdef DIAGNOSTIC
        /* only got here if controller's drive queue was inactive; should
           be in idle state */
        if (fdc->sc_state != DEVIDLE) {
                printf("fdcstart: not idle\n");
                return;
        }
#endif
        (void)fdcintr1(fdc);
}

static void
fdcpstatus(int n, struct fdc_softc *fdc)
{
        char bits[64];

        switch (n) {
        case 0:
                printf("\n");
                break;
        case 2:
                snprintb(bits, sizeof(bits), NE7_ST0BITS, fdc->sc_status[0]);
                printf(" (st0 %s cyl %d)\n", bits, fdc->sc_status[1]);
                break;
        case 7:
                snprintb(bits, sizeof(bits), NE7_ST0BITS, fdc->sc_status[0]);
                printf(" (st0 %s", bits);
                snprintb(bits, sizeof(bits), NE7_ST1BITS, fdc->sc_status[1]);
                printf(" st1 %s", bits);
                snprintb(bits, sizeof(bits), NE7_ST2BITS, fdc->sc_status[2]);
                printf(" st2 %s", bits);
                printf(" cyl %d head %d sec %d)\n",
                    fdc->sc_status[3], fdc->sc_status[4], fdc->sc_status[5]);
                break;
#ifdef DIAGNOSTIC
        default:
                printf("\nfdcstatus: weird size");
                break;
#endif
        }
}

void
fdcstatus(device_t dv, int n, const char *s)
{
        struct fdc_softc *fdc = device_private(device_parent(dv));

        if (n == 0) {
                out_fdc(fdc->sc_iot, fdc->sc_ioh, NE7CMD_SENSEI);
                (void) fdcresult(fdc);
                n = 2;
        }
        fdcpstatus(n, fdc);

        aprint_normal_dev(dv, "%s", s);

}

void
fdctimeout(void *arg)
{
        struct fdc_softc *fdc = arg;
        struct fd_softc *fd = TAILQ_FIRST(&fdc->sc_drives);

        mutex_enter(&fdc->sc_mtx);
#ifdef DEBUG
        log(LOG_ERR, "fdctimeout: state %d\n", fdc->sc_state);
#endif
        fdcstatus(fd->sc_dev, 0, "timeout");

        if (bufq_peek(fd->sc_q) != NULL)
                fdc->sc_state++;
        else
                fdc->sc_state = DEVIDLE;

        (void)fdcintr1(fdc);
        mutex_exit(&fdc->sc_mtx);
}

static int
fdcintr1(struct fdc_softc *fdc)
{
#define st0     fdc->sc_status[0]
#define cyl     fdc->sc_status[1]
        struct fd_softc *fd;
        struct buf *bp;
        bus_space_tag_t iot = fdc->sc_iot;
        bus_space_handle_t ioh = fdc->sc_ioh;
        int read, head, sec, i, nblks;
        struct fd_type *type;
        struct ne7_fd_formb *finfo = NULL;

        KASSERT(mutex_owned(&fdc->sc_mtx));
        if (fdc->sc_state == PROBING) {
#ifdef DEBUG
                printf("fdcintr: got probe interrupt\n");
#endif
                fdc->sc_probe++;
                goto out;
        }

loop:
        /* Is there a drive for the controller to do a transfer with? */
        fd = TAILQ_FIRST(&fdc->sc_drives);
        if (fd == NULL) {
                fdc->sc_state = DEVIDLE;
                goto out;
        }

        /* Is there a transfer to this drive?  If not, deactivate drive. */
        bp = bufq_peek(fd->sc_q);
        if (bp == NULL) {
                fd->sc_ops = 0;
                TAILQ_REMOVE(&fdc->sc_drives, fd, sc_drivechain);
                fd->sc_active = 0;
                goto loop;
        }

        if (bp->b_flags & B_FORMAT)
                finfo = (struct ne7_fd_formb *)bp->b_data;

        switch (fdc->sc_state) {
        case DEVIDLE:
                fdc->sc_errors = 0;
                fd->sc_skip = 0;
                fd->sc_bcount = bp->b_bcount;
                fd->sc_blkno = bp->b_blkno / (FDC_BSIZE / DEV_BSIZE);
                callout_stop(&fd->sc_motoroff_ch);
                if ((fd->sc_flags & FD_MOTOR_WAIT) != 0) {
                        fdc->sc_state = MOTORWAIT;
                        return 1;
                }
                if ((fd->sc_flags & FD_MOTOR) == 0) {
                        /* Turn on the motor, being careful about pairing. */
                        struct fd_softc *ofd = fdc->sc_fd[fd->sc_drive ^ 1];
                        if (ofd && ofd->sc_flags & FD_MOTOR) {
                                callout_stop(&ofd->sc_motoroff_ch);
                                ofd->sc_flags &= ~(FD_MOTOR | FD_MOTOR_WAIT);
                        }
                        fd->sc_flags |= FD_MOTOR | FD_MOTOR_WAIT;
                        fd_set_motor(fdc, 0);
                        fdc->sc_state = MOTORWAIT;
                        /* Allow .25s for motor to stabilize. */
                        callout_reset(&fd->sc_motoron_ch, hz / 4,
                            fd_motor_on, fd);
                        return 1;
                }
                /* Make sure the right drive is selected. */
                fd_set_motor(fdc, 0);

                /* fall through */
        case DOSEEK:
        doseek:
                if (fd->sc_cylin == bp->b_cylinder)
                        goto doio;

                out_fdc(iot, ioh, NE7CMD_SPECIFY);/* specify command */
                out_fdc(iot, ioh, fd->sc_type->steprate);
                out_fdc(iot, ioh, 6);           /* XXX head load time == 6ms */

                out_fdc(iot, ioh, NE7CMD_SEEK); /* seek function */
                out_fdc(iot, ioh, fd->sc_drive); /* drive number */
                out_fdc(iot, ioh, bp->b_cylinder * fd->sc_type->step);

                fd->sc_cylin = -1;
                fdc->sc_state = SEEKWAIT;

                iostat_seek(fd->sc_dk.dk_stats);
                disk_busy(&fd->sc_dk);

                callout_reset(&fdc->sc_timo_ch, 4 * hz, fdctimeout, fdc);
                return 1;

        case DOIO:
        doio:
                type = fd->sc_type;
                if (finfo)
                        fd->sc_skip = (char *)&(finfo->fd_formb_cylno(0)) -
                                      (char *)finfo;
                sec = fd->sc_blkno % type->seccyl;
                nblks = type->seccyl - sec;
                nblks = uimin(nblks, fd->sc_bcount / FDC_BSIZE);
                nblks = uimin(nblks, fdc->sc_maxiosize / FDC_BSIZE);
                fd->sc_nblks = nblks;
                fd->sc_nbytes = finfo ? bp->b_bcount : nblks * FDC_BSIZE;
                head = sec / type->sectrac;
                sec -= head * type->sectrac;
#ifdef DIAGNOSTIC
                {
                        int block;
                        block = (fd->sc_cylin * type->heads + head)
                            * type->sectrac + sec;
                        if (block != fd->sc_blkno) {
                                printf("fdcintr: block %d != blkno "
                                    "%" PRId64 "\n", block, fd->sc_blkno);
#ifdef DDB
                                 Debugger();
#endif
                        }
                }
#endif
                read = bp->b_flags & B_READ ? DMAMODE_READ : DMAMODE_WRITE;
                isa_dmastart(fdc->sc_ic, fdc->sc_drq,
                    (char *)bp->b_data + fd->sc_skip, fd->sc_nbytes,
                    NULL, read | DMAMODE_DEMAND, BUS_DMA_NOWAIT);
                bus_space_write_1(iot, fdc->sc_fdctlioh, 0, type->rate);
#ifdef FD_DEBUG
                printf("fdcintr: %s drive %d track %d head %d sec %d nblks %d\n",
                        read ? "read" : "write", fd->sc_drive, fd->sc_cylin,
                        head, sec, nblks);
#endif
                if (finfo) {
                        /* formatting */
                        if (out_fdc(iot, ioh, NE7CMD_FORMAT) < 0) {
                                fdc->sc_errors = 4;
                                fdcretry(fdc);
                                goto loop;
                        }
                        out_fdc(iot, ioh, (head << 2) | fd->sc_drive);
                        out_fdc(iot, ioh, finfo->fd_formb_secshift);
                        out_fdc(iot, ioh, finfo->fd_formb_nsecs);
                        out_fdc(iot, ioh, finfo->fd_formb_gaplen);
                        out_fdc(iot, ioh, finfo->fd_formb_fillbyte);
                } else {
                        if (read)
                                out_fdc(iot, ioh, NE7CMD_READ); /* READ */
                        else
                                out_fdc(iot, ioh, NE7CMD_WRITE); /* WRITE */
                        out_fdc(iot, ioh, (head << 2) | fd->sc_drive);
                        out_fdc(iot, ioh, fd->sc_cylin); /* track */
                        out_fdc(iot, ioh, head);
                        out_fdc(iot, ioh, sec + 1);      /* sector +1 */
                        out_fdc(iot, ioh, type->secsize);/* sector size */
                        out_fdc(iot, ioh, type->sectrac);/* sectors/track */
                        out_fdc(iot, ioh, type->gap1);   /* gap1 size */
                        out_fdc(iot, ioh, type->datalen);/* data length */
                }
                fdc->sc_state = IOCOMPLETE;

                disk_busy(&fd->sc_dk);

                /* allow 2 seconds for operation */
                callout_reset(&fdc->sc_timo_ch, 2 * hz, fdctimeout, fdc);
                return 1;                               /* will return later */

        case SEEKWAIT:
                callout_stop(&fdc->sc_timo_ch);
                fdc->sc_state = SEEKCOMPLETE;
                /* allow 1/50 second for heads to settle */
                callout_reset(&fdc->sc_intr_ch, hz / 50, fdcintrcb, fdc);
                return 1;

        case SEEKCOMPLETE:
                /* no data on seek */
                disk_unbusy(&fd->sc_dk, 0, 0);

                /* Make sure seek really happened. */
                out_fdc(iot, ioh, NE7CMD_SENSEI);
                if (fdcresult(fdc) != 2 || (st0 & 0xf8) != 0x20 ||
                    cyl != bp->b_cylinder * fd->sc_type->step) {
#ifdef FD_DEBUG
                        fdcstatus(fd->sc_dev, 2, "seek failed");
#endif
                        fdcretry(fdc);
                        goto loop;
                }
                fd->sc_cylin = bp->b_cylinder;
                goto doio;

        case IOTIMEDOUT:
                isa_dmaabort(fdc->sc_ic, fdc->sc_drq);
                /* FALLTHROUGH */
        case SEEKTIMEDOUT:
        case RECALTIMEDOUT:
        case RESETTIMEDOUT:
                fdcretry(fdc);
                goto loop;

        case IOCOMPLETE: /* IO DONE, post-analyze */
                callout_stop(&fdc->sc_timo_ch);

                disk_unbusy(&fd->sc_dk, (bp->b_bcount - bp->b_resid),
                    (bp->b_flags & B_READ));

                if (fdcresult(fdc) != 7 || (st0 & 0xf8) != 0) {
                        isa_dmaabort(fdc->sc_ic, fdc->sc_drq);
#ifdef FD_DEBUG
                        fdcstatus(fd->sc_dev, 7, bp->b_flags & B_READ ?
                            "read failed" : "write failed");
                        printf("blkno %llu nblks %d\n",
                            (unsigned long long)fd->sc_blkno, fd->sc_nblks);
#endif
                        fdcretry(fdc);
                        goto loop;
                }
                isa_dmadone(fdc->sc_ic, fdc->sc_drq);
                if (fdc->sc_errors) {
                        diskerr(bp, "fd", "soft error (corrected)", LOG_PRINTF,
                            fd->sc_skip / FDC_BSIZE, NULL);
                        printf("\n");
                        fdc->sc_errors = 0;
                }
                fd->sc_blkno += fd->sc_nblks;
                fd->sc_skip += fd->sc_nbytes;
                fd->sc_bcount -= fd->sc_nbytes;
                if (!finfo && fd->sc_bcount > 0) {
                        bp->b_cylinder = fd->sc_blkno / fd->sc_type->seccyl;
                        goto doseek;
                }
                fdfinish(fd, bp);
                goto loop;

        case DORESET:
                /* try a reset, keep motor on */
                fd_set_motor(fdc, 1);
                delay(100);
                fd_set_motor(fdc, 0);
                fdc->sc_state = RESETCOMPLETE;
                callout_reset(&fdc->sc_timo_ch, hz / 2, fdctimeout, fdc);
                return 1;                       /* will return later */

        case RESETCOMPLETE:
                callout_stop(&fdc->sc_timo_ch);
                /* clear the controller output buffer */
                for (i = 0; i < 4; i++) {
                        out_fdc(iot, ioh, NE7CMD_SENSEI);
                        (void) fdcresult(fdc);
                }

                /* fall through */
        case DORECAL:
                out_fdc(iot, ioh, NE7CMD_RECAL); /* recalibrate function */
                out_fdc(iot, ioh, fd->sc_drive);
                fdc->sc_state = RECALWAIT;
                callout_reset(&fdc->sc_timo_ch, 5 * hz, fdctimeout, fdc);
                return 1;                       /* will return later */

        case RECALWAIT:
                callout_stop(&fdc->sc_timo_ch);
                fdc->sc_state = RECALCOMPLETE;
                /* allow 1/30 second for heads to settle */
                callout_reset(&fdc->sc_intr_ch, hz / 30, fdcintrcb, fdc);
                return 1;                       /* will return later */

        case RECALCOMPLETE:
                out_fdc(iot, ioh, NE7CMD_SENSEI);
                if (fdcresult(fdc) != 2 || (st0 & 0xf8) != 0x20 || cyl != 0) {
#ifdef FD_DEBUG
                        fdcstatus(fd->sc_dev, 2, "recalibrate failed");
#endif
                        fdcretry(fdc);
                        goto loop;
                }
                fd->sc_cylin = 0;
                goto doseek;

        case MOTORWAIT:
                if (fd->sc_flags & FD_MOTOR_WAIT)
                        return 1;               /* time's not up yet */
                goto doseek;

        default:
                fdcstatus(fd->sc_dev, 0, "stray interrupt");
                return 1;
        }
#undef  st0
#undef  cyl

out:
        cv_signal(&fdc->sc_cv);
        return 1;
}

static void
fdcintrcb(void *arg)
{
        (void)fdcintr(arg);
}

int
fdcintr(void *arg)
{
        int rc;
        struct fdc_softc *fdc = arg;

        mutex_enter(&fdc->sc_mtx);
        rc = fdcintr1(fdc);
        mutex_exit(&fdc->sc_mtx);
        return rc;
}

void
fdcretry(struct fdc_softc *fdc)
{
        struct fd_softc *fd;
        struct buf *bp;

        fd = TAILQ_FIRST(&fdc->sc_drives);
        bp = bufq_peek(fd->sc_q);

        if (fd->sc_opts & FDOPT_NORETRY)
            goto fail;
        switch (fdc->sc_errors) {
        case 0:
                /* try again */
                fdc->sc_state = DOSEEK;
                break;

        case 1: case 2: case 3:
                /* didn't work; try recalibrating */
                fdc->sc_state = DORECAL;
                break;

        case 4:
                /* still no go; reset the bastard */
                fdc->sc_state = DORESET;
                break;

        default:
        fail:
                if ((fd->sc_opts & FDOPT_SILENT) == 0) {
                        diskerr(bp, "fd", "hard error", LOG_PRINTF,
                                fd->sc_skip / FDC_BSIZE, NULL);
                        fdcpstatus(7, fdc);
                }

                bp->b_error = EIO;
                fdfinish(fd, bp);
        }
        fdc->sc_errors++;
}

int
fdioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l)
{
        struct fd_softc *fd =
            device_lookup_private(&fd_cd, FDUNIT(dev));
        struct fdformat_parms *form_parms;
        struct fdformat_cmd *form_cmd;
        struct ne7_fd_formb *fd_formb;
        struct disklabel *lp = fd->sc_dk.dk_label;
        int error;
        unsigned int scratch;
        int il[FD_MAX_NSEC + 1];
        int i, j;
#ifdef __HAVE_OLD_DISKLABEL
        struct disklabel newlabel;
#endif

        switch (cmd) {
        case DIOCGPARTINFO:
        case DIOCGDINFO:
#ifdef __HAVE_OLD_DISKLABEL
        case ODIOCGDINFO:
#endif
                memset(lp, 0, sizeof(*lp));

                lp->d_type = DKTYPE_FLOPPY;
                lp->d_secsize = FDC_BSIZE;
                lp->d_nsectors = fd->sc_type->sectrac;
                lp->d_ntracks = fd->sc_type->heads;
                lp->d_ncylinders = fd->sc_type->cyls;
                lp->d_secpercyl = fd->sc_type->seccyl;
                lp->d_secperunit = fd->sc_type->size;

                if (readdisklabel(dev, fdstrategy, lp, NULL) != NULL)
                        return EINVAL;
                break;
        }

        error = disk_ioctl(&fd->sc_dk, dev, cmd, addr, flag, l);
        if (error != EPASSTHROUGH)
                return error;

        switch (cmd) {
        case DIOCWLABEL:
                if ((flag & FWRITE) == 0)
                        return EBADF;
                /* XXX do something */
                return 0;

        case DIOCWDINFO:
#ifdef __HAVE_OLD_DISKLABEL
        case ODIOCWDINFO:
#endif
        {
                if ((flag & FWRITE) == 0)
                        return EBADF;
#ifdef __HAVE_OLD_DISKLABEL
                if (cmd == ODIOCWDINFO) {
                        memset(&newlabel, 0, sizeof newlabel);
                        memcpy(&newlabel, addr, sizeof (struct olddisklabel));
                        addr = &newlabel;
                }
#endif
                error = setdisklabel(lp, addr, 0, NULL);
                if (error)
                        return error;

                error = writedisklabel(dev, fdstrategy, lp, NULL);
                return error;
        }

        case FDIOCGETFORMAT:
                form_parms = (struct fdformat_parms *)addr;
                form_parms->fdformat_version = FDFORMAT_VERSION;
                form_parms->nbps = 128 * (1 << fd->sc_type->secsize);
                form_parms->ncyl = fd->sc_type->cyls;
                form_parms->nspt = fd->sc_type->sectrac;
                form_parms->ntrk = fd->sc_type->heads;
                form_parms->stepspercyl = fd->sc_type->step;
                form_parms->gaplen = fd->sc_type->gap2;
                form_parms->fillbyte = fd->sc_type->fillbyte;
                form_parms->interleave = fd->sc_type->interleave;
                switch (fd->sc_type->rate) {
                case FDC_500KBPS:
                        form_parms->xfer_rate = 500 * 1024;
                        break;
                case FDC_300KBPS:
                        form_parms->xfer_rate = 300 * 1024;
                        break;
                case FDC_250KBPS:
                        form_parms->xfer_rate = 250 * 1024;
                        break;
                default:
                        return EINVAL;
                }
                return 0;

        case FDIOCSETFORMAT:
                if((flag & FWRITE) == 0)
                        return EBADF;   /* must be opened for writing */
                form_parms = (struct fdformat_parms *)addr;
                if (form_parms->fdformat_version != FDFORMAT_VERSION)
                        return EINVAL;  /* wrong version of formatting prog */

                scratch = form_parms->nbps >> 7;
                if ((form_parms->nbps & 0x7f) || ffs(scratch) == 0 ||
                    scratch & ~(1 << (ffs(scratch)-1)))
                        /* not a power-of-two multiple of 128 */
                        return EINVAL;

                switch (form_parms->xfer_rate) {
                case 500 * 1024:
                        fd->sc_type->rate = FDC_500KBPS;
                        break;
                case 300 * 1024:
                        fd->sc_type->rate = FDC_300KBPS;
                        break;
                case 250 * 1024:
                        fd->sc_type->rate = FDC_250KBPS;
                        break;
                default:
                        return EINVAL;
                }

                if (form_parms->nspt > FD_MAX_NSEC ||
                    form_parms->fillbyte > 0xff ||
                    form_parms->interleave > 0xff)
                        return EINVAL;
                fd->sc_type->sectrac = form_parms->nspt;
                if (form_parms->ntrk != 2 && form_parms->ntrk != 1)
                        return EINVAL;
                fd->sc_type->heads = form_parms->ntrk;
                fd->sc_type->seccyl = form_parms->nspt * form_parms->ntrk;
                fd->sc_type->secsize = ffs(scratch)-1;
                fd->sc_type->gap2 = form_parms->gaplen;
                fd->sc_type->cyls = form_parms->ncyl;
                fd->sc_type->size = fd->sc_type->seccyl * form_parms->ncyl *
                    form_parms->nbps / DEV_BSIZE;
                fd->sc_type->step = form_parms->stepspercyl;
                fd->sc_type->fillbyte = form_parms->fillbyte;
                fd->sc_type->interleave = form_parms->interleave;
                return 0;

        case FDIOCFORMAT_TRACK:
                if((flag & FWRITE) == 0)
                        return EBADF;   /* must be opened for writing */
                form_cmd = (struct fdformat_cmd *)addr;
                if (form_cmd->formatcmd_version != FDFORMAT_VERSION)
                        return EINVAL;  /* wrong version of formatting prog */

                if (form_cmd->head >= fd->sc_type->heads ||
                    form_cmd->cylinder >= fd->sc_type->cyls) {
                        return EINVAL;
                }

                fd_formb = kmem_alloc(sizeof(*fd_formb), KM_SLEEP);
                fd_formb->head = form_cmd->head;
                fd_formb->cyl = form_cmd->cylinder;
                fd_formb->transfer_rate = fd->sc_type->rate;
                fd_formb->fd_formb_secshift = fd->sc_type->secsize;
                fd_formb->fd_formb_nsecs = fd->sc_type->sectrac;
                fd_formb->fd_formb_gaplen = fd->sc_type->gap2;
                fd_formb->fd_formb_fillbyte = fd->sc_type->fillbyte;

                memset(il, 0, sizeof il);
                for (j = 0, i = 1; i <= fd_formb->fd_formb_nsecs; i++) {
                        while (il[(j%fd_formb->fd_formb_nsecs)+1])
                                j++;
                        il[(j%fd_formb->fd_formb_nsecs)+1] = i;
                        j += fd->sc_type->interleave;
                }
                for (i = 0; i < fd_formb->fd_formb_nsecs; i++) {
                        fd_formb->fd_formb_cylno(i) = form_cmd->cylinder;
                        fd_formb->fd_formb_headno(i) = form_cmd->head;
                        fd_formb->fd_formb_secno(i) = il[i+1];
                        fd_formb->fd_formb_secsize(i) = fd->sc_type->secsize;
                }

                error = fdformat(dev, fd_formb, l);
                kmem_free(fd_formb, sizeof(*fd_formb));
                return error;

        case FDIOCGETOPTS:              /* get drive options */
                *(int *)addr = fd->sc_opts;
                return 0;

        case FDIOCSETOPTS:              /* set drive options */
                fd->sc_opts = *(int *)addr;
                return 0;

        default:
                return ENOTTY;
        }

#ifdef DIAGNOSTIC
        panic("fdioctl: impossible");
#endif
}

int
fdformat(dev_t dev, struct ne7_fd_formb *finfo, struct lwp *l)
{
        int rv = 0;
        struct fd_softc *fd =
            device_lookup_private(&fd_cd, FDUNIT(dev));
        struct fd_type *type = fd->sc_type;
        struct buf *bp;

        /* set up a buffer header for fdstrategy() */
        bp = getiobuf(NULL, false);
        if (bp == NULL)
                return ENOBUFS;

        bp->b_cflags = BC_BUSY;
        bp->b_flags = B_PHYS | B_FORMAT;
        bp->b_proc = l->l_proc;
        bp->b_dev = dev;

        /*
         * calculate a fake blkno, so fdstrategy() would initiate a
         * seek to the requested cylinder
         */
        bp->b_blkno = (finfo->cyl * (type->sectrac * type->heads)
                       + finfo->head * type->sectrac) * FDC_BSIZE / DEV_BSIZE;

        bp->b_bcount = sizeof(struct fd_idfield_data) * finfo->fd_formb_nsecs;
        bp->b_data = (void *)finfo;

#ifdef FD_DEBUG
        printf("fdformat: blkno %" PRIx64 " count %x\n",
            bp->b_blkno, bp->b_bcount);
#endif

        /* now do the format */
        fdstrategy(bp);

        /* ...and wait for it to complete */
        rv = biowait(bp);
        putiobuf(bp);
        return rv;
}

/*
 * Mountroot hook: prompt the user to enter the root file system
 * floppy.
 */
void
fd_mountroot_hook(device_t dev)
{
        int c;

        printf("Insert filesystem floppy and press return.");
        cnpollc(true);
        for (;;) {
                c = cngetc();
                if ((c == '\r') || (c == '\n')) {
                        printf("\n");
                        break;
                }
        }
        cnpollc(false);
}

static void
fd_set_geometry(struct fd_softc *fd)
{
        const struct fd_type *fdt;

        fdt = fd->sc_type;
        if (fdt == NULL) {
                fdt = fd->sc_deftype;
                if (fdt == NULL)
                        return;
        }

        struct disk_geom *dg = &fd->sc_dk.dk_geom;

        memset(dg, 0, sizeof(*dg));
        dg->dg_secperunit = fdt->size;
        dg->dg_nsectors = fdt->sectrac;
        switch (fdt->secsize) {
        case 2:
                dg->dg_secsize = 512;
                break;
        case 3:
                dg->dg_secsize = 1024;
                break;
        default:
                break;
        }
        dg->dg_ntracks = fdt->heads;
        dg->dg_ncylinders = fdt->cyls;
        disk_set_info(fd->sc_dev, &fd->sc_dk, NULL);
}