/*      $NetBSD: fd.c,v 1.65 2023/08/28 17:53:46 andvar Exp $   */

/*-
 * Copyright (c) 1998 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
 *      from: fd.c,v 1.104 1997/01/09 04:30:08 mycroft Exp
 */

/*
 * 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 1.65 2023/08/28 17:53:46 andvar Exp $");

#include "opt_ddb.h"

#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/bus.h>

#include <uvm/uvm_extern.h>

#include <arm/fiq.h>

#include <machine/cpu.h>
#include <machine/intr.h>
#include <machine/io.h>

#include <arm/iomd/iomdreg.h>
#include <arm/iomd/iomdvar.h>

#include <acorn32/mainbus/piocvar.h>
#include <acorn32/mainbus/fdreg.h>

#include "locators.h"

#define NE7CMD_CONFIGURE 0x13

#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

enum fdc_state {
        DEVIDLE = 0,
        MOTORWAIT,
        DOSEEK,
        SEEKWAIT,
        SEEKTIMEDOUT,
        SEEKCOMPLETE,
        DOIO,
        IOCOMPLETE,
        IOTIMEDOUT,
        DORESET,
        RESETCOMPLETE,
        RESETTIMEDOUT,
        DORECAL,
        RECALWAIT,
        RECALTIMEDOUT,
        RECALCOMPLETE,
};

/* software state, per controller */
struct fdc_softc {
        device_t sc_dev;                /* boilerplate */
        void *sc_ih;

        bus_space_tag_t sc_iot;         /* ISA i/o space identifier */
        bus_space_handle_t   sc_ioh;    /* ISA io handle */

        struct callout sc_timo_ch;      /* timeout callout */
        struct callout sc_intr_ch;      /* pseudo-intr callout */

        /* ...for pseudo-DMA... */
        struct fiqhandler sc_fh;        /* FIQ handler descriptor */
        struct fiqregs sc_fr;           /* FIQ handler reg context */
        int sc_drq;

        struct fd_softc *sc_fd[4];      /* pointers to children */
        TAILQ_HEAD(drivehead, fd_softc) sc_drives;
        enum fdc_state sc_state;
        int sc_errors;                  /* number of retries so far */
        u_char sc_status[7];            /* copy of registers */
};

/* controller driver configuration */
int fdcprobe(device_t, cfdata_t, void *);
int fdprint(void *, const char *);
void fdcattach(device_t, device_t, void *);

CFATTACH_DECL_NEW(fdc, sizeof(struct fdc_softc),
    fdcprobe, fdcattach, NULL, NULL);

/*
 * Floppies come in various flavors, e.g., 1.2MB vs 1.44MB; here is how
 * we tell them apart.
 */
struct fd_type {
        int     sectrac;        /* sectors per track */
        int     heads;          /* number of heads */
        int     seccyl;         /* sectors per cylinder */
        int     secsize;        /* size code for sectors */
        int     datalen;        /* data len when secsize = 0 */
        int     steprate;       /* step rate and head unload time */
        int     gap1;           /* gap len between sectors */
        int     gap2;           /* formatting gap */
        int     cyls;           /* total num of cylinders */
        int     size;           /* size of disk in sectors */
        int     step;           /* steps per cylinder */
        int     rate;           /* transfer speed code */
        u_char  fillbyte;       /* format fill byte */
        u_char  interleave;     /* interleave factor (formatting) */
        const char *name;
};

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

/* software state, per disk (with up to 4 disks per ctlr) */
struct fd_softc {
        device_t sc_dev;
        struct disk sc_dk;

        struct fd_type *sc_deftype;     /* default type descriptor */
        struct fd_type *sc_type;        /* current type descriptor */
        struct fd_type sc_type_copy;    /* copy for fiddling when formatting */

        struct callout sc_motoron_ch;
        struct callout sc_motoroff_ch;

        daddr_t sc_blkno;       /* starting block number */
        int sc_bcount;          /* byte count left */
        int sc_opts;                    /* user-set options */
        int sc_skip;            /* bytes already transferred */
        int sc_nblks;           /* number of blocks currently transferring */
        int sc_nbytes;          /* number of bytes currently transferring */

        int sc_drive;           /* physical unit number */
        int sc_flags;
#define FD_OPEN         0x01            /* it's open */
#define FD_MOTOR        0x02            /* motor should be on */
#define FD_MOTOR_WAIT   0x04            /* motor coming up */
        int sc_cylin;           /* where we think the head is */

        void *sc_sdhook;        /* saved shutdown hook for drive. */

        TAILQ_ENTRY(fd_softc) sc_drivechain;
        int sc_ops;             /* I/O ops since last switch */
        struct bufq_state *sc_q;/* pending I/O requests */
        int sc_active;          /* number of active I/O operations */
};

/* floppy driver configuration */
int fdprobe(device_t, cfdata_t, void *);
void fdattach(device_t, device_t, void *);

extern char floppy_read_fiq[], floppy_read_fiq_end[];
extern char floppy_write_fiq[], floppy_write_fiq_end[];

CFATTACH_DECL_NEW(fd, sizeof(struct fd_softc),
    fdprobe, fdattach, NULL, NULL);

extern struct cfdriver fd_cd;

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
};

struct fd_type *fd_nvtotype(const char *, int, int);
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);
int out_fdc(bus_space_tag_t iot, bus_space_handle_t ioh, u_char x);
void fdcstart(struct fdc_softc *fdc);
void fdcstatus(device_t dv, int n, const char *s);
void fdctimeout(void *arg);
void fdcpseudointr(void *arg);
int fdcintr(void *);
void fdcretry(struct fdc_softc *fdc);
void fdfinish(struct fd_softc *fd, struct buf *bp);
static struct fd_type *fd_dev_to_type(struct fd_softc *, dev_t);
int fdformat(dev_t, struct ne7_fd_formb *, struct lwp *);

int
fdcprobe(device_t parent, cfdata_t cf, void *aux)
{
        struct pioc_attach_args *pa = aux;
        bus_space_tag_t iot;
        bus_space_handle_t ioh;
        int rv;

        if (pa->pa_name && strcmp(pa->pa_name, "fdc") != 0)
                return(0);

        iot = pa->pa_iot;
        rv = 0;

        /* Map the i/o space. */
        if (bus_space_map(iot, pa->pa_iobase + pa->pa_offset, FDC_NPORT, 0, &ioh))
                return 0;

        /* reset */
        bus_space_write_2(iot, ioh, fdout, 0);
        delay(100);
        bus_space_write_2(iot, ioh, fdout, FDO_FRST);

        /* see if it can handle a command */
        if (out_fdc(iot, ioh, NE7CMD_SPECIFY) < 0)
                goto out;
        out_fdc(iot, ioh, 0xdf);
        out_fdc(iot, ioh, 2);

        rv = 1;
        pa->pa_iosize = FDC_NPORT;

 out:
        bus_space_unmap(iot, ioh, FDC_NPORT);
        return rv;
}

/*
 * Arguments passed between fdcattach and fdprobe.
 */
struct fdc_attach_args {
        int fa_drive;
        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)
{
        register struct fdc_attach_args *fa = aux;

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

void
fdcattach(device_t parent, device_t self, void *aux)
{
        struct fdc_softc *fdc = device_private(self);
        bus_space_tag_t iot;
        bus_space_handle_t ioh;
        struct pioc_attach_args *pa = aux;
        struct fdc_attach_args fa;
        int type;

        iot = pa->pa_iot;

        /* Re-map the I/O space. */
        if (bus_space_map(iot, pa->pa_iobase + pa->pa_offset, FDC_NPORT, 0, &ioh))
                panic("fdcattach: couldn't map I/O ports");

        fdc->sc_dev = self;
        fdc->sc_iot = iot;
        fdc->sc_ioh = ioh;

        fdc->sc_drq = pa->pa_iobase + pa->pa_offset + pa->pa_drq;
        fdc->sc_state = DEVIDLE;
        TAILQ_INIT(&fdc->sc_drives);

        printf("\n");

        callout_init(&fdc->sc_timo_ch, 0); 
        callout_init(&fdc->sc_intr_ch, 0);

        fdc->sc_ih = intr_claim(pa->pa_irq, IPL_BIO, "fdc", fdcintr, fdc);
        if (!fdc->sc_ih)
                panic("%s: Cannot claim IRQ %d",
                    device_xname(self), pa->pa_irq);

#if 0
        /*
         * The NVRAM info only tells us about the first two disks on the
         * `primary' floppy controller.
         */
        if (device_unit(fdc->sc_dev) == 0)
                type = mc146818_read(NULL, NVRAM_DISKETTE); /* XXX softc */
        else
                type = -1;
#endif
        type = 0x10;    /* XXX - hardcoded for 1 floppy */

        /* physical limit: four drives per controller. */
        for (fa.fa_drive = 0; fa.fa_drive < 4; fa.fa_drive++) {
                if (type >= 0 && fa.fa_drive < 2)
                        fa.fa_deftype = fd_nvtotype(device_xname(fdc->sc_dev),
                            type, fa.fa_drive);
                else
                        fa.fa_deftype = NULL;           /* unknown */
                (void)config_found(self, (void *)&fa, fdprint, CFARGS_NONE);
        }
}

int
fdprobe(device_t parent, cfdata_t cf, void *aux)
{
        struct fdc_softc *fdc = device_private(parent);
        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.
         */

        /* Don't need this for arm32 port but leave for the time being (it won't hurt) */

        if (cf->cf_loc[FDCCF_DRIVE] == FDCCF_DRIVE_DEFAULT && drive >= 2)
                return 0;

        /* select drive and turn on motor */
        bus_space_write_2(iot, ioh, fdout, drive | FDO_FRST | FDO_MOEN(drive));
        /* wait for motor to spin up */
        delay(250000);
        out_fdc(iot, ioh, NE7CMD_RECAL);
        out_fdc(iot, ioh, drive);
        /* wait for recalibrate */
        delay(2000000);
        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);

        if (n != 2 || (fdc->sc_status[0] & 0xf8) != 0x20)
                return 0;

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

        /* Needed to power off if the motor is on when we halt. */

}

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

        type = (drive == 0 ? nvraminfo : nvraminfo << 4) & 0xf0;
        switch (type) {
#ifndef RC7500
        case 0x00 :
                return NULL;
#else
        case 0x00 :
#endif  /* !RC7500 */
        case 0x10 :
                return &fd_types[0];
        default:
                printf("%s: drive %d: unknown device type 0x%x\n",
                    fdc, drive, type);
                return NULL;
        }
}

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

        if (type > (sizeof(fd_types) / sizeof(fd_types[0])))
                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));
        int sz;
        int s;

        /* 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 %lld b_bcount %d blkno %lld cylin %d sz %d\n",
            bp->b_blkno, bp->b_bcount, fd->sc_blkno, bp->b_cylinder, sz);
#endif

        /* Queue transfer on drive, activate drive and controller if idle. */
        s = splbio();
        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 {
                struct fdc_softc *fdc =
                    device_private(device_parent(fd->sc_dev));
                if (fdc->sc_state == DEVIDLE) {
                        printf("fdstrategy: controller inactive\n");
                        fdcstart(fdc);
                }
        }
#endif
        splx(s);
        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 = fdc->sc_drives.tqh_first != 0;

        /* 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 (fd->sc_drivechain.tqe_next && ++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;

        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 = fdc->sc_drives.tqh_first) != 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_2(fdc->sc_iot, fdc->sc_ioh, fdout, status);
}

void
fd_motor_off(void *arg)
{
        struct fd_softc *fd = arg;
        int s;

        s = splbio();
        fd->sc_flags &= ~(FD_MOTOR | FD_MOTOR_WAIT);
        fd_set_motor(device_private(device_parent(fd->sc_dev)), 0);
        splx(s);
}

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

        s = splbio();
        fd->sc_flags &= ~FD_MOTOR_WAIT;
        if ((fdc->sc_drives.tqh_first == fd) && (fdc->sc_state == MOTORWAIT))
                (void) fdcintr(fdc);
        splx(s);
}

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;
        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)
{
        int i = 100000;

        while ((bus_space_read_1(iot, ioh, fdsts) & NE7_DIO) && i-- > 0);
        if (i <= 0)
                return -1;
        while ((bus_space_read_1(iot, ioh, fdsts) & NE7_RQM) == 0 && i-- > 0);
        if (i <= 0)
                return -1;
        bus_space_write_2(iot, ioh, fddata, x);
        return 0;
}

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

        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)
{

#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) fdcintr(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;
        }

        printf("%s: %s", device_xname(dv), s);
        fdcpstatus(n, fdc);
}

void
fdctimeout(void *arg)
{
        struct fdc_softc *fdc = arg;
        struct fd_softc *fd = fdc->sc_drives.tqh_first;
        int s;

        s = splbio();
#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) fdcintr(fdc);
        splx(s);
}

void
fdcpseudointr(void *arg)
{
        int s;

        /* Just ensure it has the right spl. */
        s = splbio();
        (void) fdcintr(arg);
        splx(s);
}

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

loop:
        /* Is there a drive for the controller to do a transfer with? */
        fd = fdc->sc_drives.tqh_first;
        if (fd == NULL) {
                fdc->sc_state = DEVIDLE;
                return 1;
        }

        /* 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;

#if 1
                out_fdc(iot, ioh, NE7CMD_CONFIGURE);/* configure command */
                out_fdc(iot, ioh, 0);
                out_fdc(iot, ioh, 0x18);
                out_fdc(iot, ioh, 0);
#endif
                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_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
                {daddr_t  block;
                 block = (fd->sc_cylin * type->heads + head) * type->sectrac + sec;
                 if (block != fd->sc_blkno) {
                         printf("fdcintr: block %" PRId64
                             " != blkno %" PRId64 "\n", 
                                block, fd->sc_blkno);
#ifdef DDB
                         Debugger();
#endif
                 }}
#endif
                read = bp->b_flags & B_READ;
                if (read) {
                        fdc->sc_fh.fh_func = floppy_read_fiq;
                        fdc->sc_fh.fh_size = floppy_read_fiq_end -
                            floppy_read_fiq;
                } else {
                        fdc->sc_fh.fh_func = floppy_write_fiq;
                        fdc->sc_fh.fh_size = floppy_read_fiq_end -
                            floppy_read_fiq;
                }
                fdc->sc_fh.fh_flags = 0;
                fdc->sc_fh.fh_regs = &fdc->sc_fr;
                fdc->sc_fr.fr_r9 = IOMD_BASE + (IOMD_FIQRQ << 2);
                fdc->sc_fr.fr_r10 = fd->sc_nbytes;
                fdc->sc_fr.fr_r11 =
                    (u_int)((uintptr_t)bp->b_data + fd->sc_skip);
                fdc->sc_fr.fr_r12 = fdc->sc_drq;
#ifdef FD_DEBUG
                printf("fdc-doio:r9=%x r10=%x r11=%x r12=%x data=%x skip=%x\n",
                    fdc->sc_fr.fr_r9, fdc->sc_fr.fr_r10, fdc->sc_fr.fr_r11,
                    fdc->sc_fr.fr_r12, (u_int)bp->b_data, fd->sc_skip);
#endif
                if (fiq_claim(&fdc->sc_fh) == -1)
                        panic("%s: Cannot claim FIQ vector",
                            device_xname(fdc->sc_dev));
                IOMD_WRITE_BYTE(IOMD_FIQMSK, 0x01);
                bus_space_write_2(iot, ioh, fdctl, 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 */
#if 0
                callout_reset(&fdc->sc_intr_ch, hz / 50, fdcpseudointr, fdc);
#endif
                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:
                fiq_release(&fdc->sc_fh);
                IOMD_WRITE_BYTE(IOMD_FIQMSK, 0x00);
        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) {
                        fiq_release(&fdc->sc_fh);
                        IOMD_WRITE_BYTE(IOMD_FIQMSK, 0x00);
#ifdef FD_DEBUG
                        fdcstatus(fd->sc_dev, 7, bp->b_flags & B_READ ?
                            "read failed" : "write failed");
                        printf("blkno %lld nblks %d\n",
                            fd->sc_blkno, fd->sc_nblks);
#endif
                        fdcretry(fdc);
                        goto loop;
                }
                fiq_release(&fdc->sc_fh);
                IOMD_WRITE_BYTE(IOMD_FIQMSK, 0x00);
                if (fdc->sc_errors) {
#if 0
                        diskerr(bp, "fd", "soft error (corrected)", LOG_PRINTF,
                            fd->sc_skip / FDC_BSIZE, (struct disklabel *)NULL);
                        printf("\n");
#endif
                        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 */
#if 0
                callout_reset(&fdc->sc_intr_ch, hz / 30, fdcpseudointr, fdc);
#endif
                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;
        }
#ifdef DIAGNOSTIC
        panic("fdcintr: impossible");
#endif
#undef  st0
#undef  cyl
}

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

        fd = fdc->sc_drives.tqh_first;
        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,
                                (struct disklabel *)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 buffer;
        int error;
        unsigned int scratch;
        int il[FD_MAX_NSEC + 1];
        register int i, j;

        switch (cmd) {
        case DIOCGDINFO:
                memset(&buffer, 0, sizeof(buffer));

                buffer.d_secpercyl = fd->sc_type->seccyl;
                buffer.d_type = DKTYPE_FLOPPY;
                buffer.d_secsize = FDC_BSIZE;

                if (readdisklabel(dev, fdstrategy, &buffer, NULL) != NULL)
                        return EINVAL;

                *(struct disklabel *)addr = buffer;
                return 0;

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

        case DIOCWDINFO:
                if ((flag & FWRITE) == 0)
                        return EBADF;

                error = setdisklabel(&buffer, (struct disklabel *)addr, 0, NULL);
                if (error)
                        return error;

                error = writedisklabel(dev, fdstrategy, &buffer, 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 == 0)
                return ENOBUFS;
        bp->b_flags = B_PHYS | B_FORMAT;
        bp->b_cflags |= BC_BUSY;
        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 DEBUG
        printf("fdformat: blkno %llx count %x\n",
            (unsigned long long)bp->b_blkno, bp->b_bcount);
#endif

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

        /* ...and wait for it to complete */
        /* XXX very dodgy */
        mutex_enter(bp->b_objlock);
        while (!(bp->b_oflags & BO_DONE)) {
                rv = cv_timedwait(&bp->b_done, bp->b_objlock, 20 * hz);
                if (rv == EWOULDBLOCK)
                        break;
        }
        mutex_exit(bp->b_objlock);

        if (rv == EWOULDBLOCK) {
                /* timed out */
                rv = EIO;
                biodone(bp);
        } else if (bp->b_error != 0)
                rv = bp->b_error;
        putiobuf(bp);
        return rv;
}

#include <dev/md.h>

int load_memory_disc_from_floppy(struct md_conf *md, dev_t dev);

int
load_memory_disc_from_floppy(struct md_conf *md, dev_t dev)
{
        struct buf *bp;
        int loop;
        int s;
        int type;
        int floppysize;

        if (bdevsw_lookup(dev) != &fd_bdevsw)
                return(EINVAL);

        if (md->md_type == MD_UNCONFIGURED || md->md_addr == 0)
                return(EBUSY);

        type = FDTYPE(dev) - 1;
        if (type < 0) type = 0;
        floppysize = fd_types[type].size << (fd_types[type].secsize + 7);
        
        if (md->md_size < floppysize) {
                printf("Memory disc is not big enough for floppy image\n");
                return(EINVAL);
        }

/* We have the memory disk ! */

        printf("Loading memory disc : %4dK ", 0);

/* obtain a buffer */

        bp = geteblk(fd_types[type].sectrac * DEV_BSIZE);
    
/* request no partition relocation by driver on I/O operations */

        bp->b_dev = dev;

        s = splbio();

        if (fdopen(bp->b_dev, 0, 0, curlwp) != 0) {
                brelse(bp, 0);          
                printf("Cannot open floppy device\n");
                        return(EINVAL);
        }

        for (loop = 0;
            loop < (floppysize / DEV_BSIZE / fd_types[type].sectrac);
            ++loop) {
                printf("\x08\x08\x08\x08\x08\x08%4dK ",
                    loop * fd_types[type].sectrac * DEV_BSIZE / 1024);
                bp->b_blkno = loop * fd_types[type].sectrac;
                bp->b_bcount = fd_types[type].sectrac * DEV_BSIZE;
                bp->b_flags |= B_READ;
                bp->b_error = 0;
                bp->b_resid = 0;
                fdstrategy(bp);

                if (biowait(bp))
                        panic("Cannot load floppy image");
                                                 
                memcpy((char *)md->md_addr + loop * fd_types[type].sectrac
                    * DEV_BSIZE, (void *)bp->b_data,
                    fd_types[type].sectrac * DEV_BSIZE);
        }
        printf("\x08\x08\x08\x08\x08\x08%4dK done\n",
            loop * fd_types[type].sectrac * DEV_BSIZE / 1024);
        
        fdclose(bp->b_dev, 0, 0, curlwp);

        brelse(bp, 0);

        splx(s);
        return(0);
}