/*      $NetBSD: hdfd.c,v 1.92 2023/01/06 10:28:28 tsutsui Exp $        */

/*-
 * Copyright (c) 1996 Leo Weppelman
 * 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
 */

/*-
 * Copyright (c) 1993, 1994, 1995, 1996
 *      Charles M. Hannum.  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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. 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: hdfd.c,v 1.92 2023/01/06 10:28:28 tsutsui 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 <uvm/uvm_extern.h>

#include <machine/cpu.h>
#include <sys/bus.h>
#include <machine/iomap.h>
#include <machine/mfp.h>
#include <machine/intr.h>

#include <atari/dev/hdfdreg.h>
#include <atari/atari/device.h>

#include "ioconf.h"
#include "locators.h"

/*
 * {b,c}devsw[] function prototypes
 */
static dev_type_open(fdopen);
static dev_type_close(fdclose);
static dev_type_read(fdread);
static dev_type_write(fdwrite);
static dev_type_ioctl(fdioctl);
static dev_type_strategy(fdstrategy);

volatile u_char *fdio_addr;

#define wrt_fdc_reg(reg, val)   { fdio_addr[reg] = val; }
#define rd_fdc_reg(reg)         ( fdio_addr[reg] )

#define fdc_ienable()           MFP2->mf_ierb |= IB_DCHG;

/*
 * Interface to the pseudo-DMA handler
 */
void    fddma_intr(void);
void *  fddmaaddr  = NULL;
int     fddmalen   = 0;

extern void     mfp_hdfd_nf(void), mfp_hdfd_fifo(void);

/*
 * Argument to fdcintr.....
 */
static void     *intr_arg = NULL; /* XXX: arg. to intr_establish() */



#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 */

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

        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 */
        int             sc_overruns;    /* number of overruns so far */
        u_char          sc_status[7];   /* copy of registers */
};

/* controller driver configuration */
static int      fdcprobe(device_t, cfdata_t, void *);
static int      fdprint(void *, const char *);
static 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     tracks;         /* total num of tracks */
        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!
 * The order of the types is the same as for the TT/Falcon....
 */
struct fd_type fd_types[] = {
        /* 360kB in 720kB drive */
        {  9,2,18,2,0xff,0xdf,0x2a,0x50,40, 720,2,FDC_125KBPS,0xf6,1,"360KB"  },
        /* 3.5" 720kB diskette */
        {  9,2,18,2,0xff,0xdf,0x2a,0x50,80,1440,1,FDC_125KBPS,0xf6,1,"720KB"  },
        /* 1.44MB diskette */
        { 18,2,36,2,0xff,0xcf,0x1b,0x6c,80,2880,1,FDC_250KBPS,0xf6,1,"1.44MB" },
};

/* 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 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;       /* #blocks currently transferring */
        int             sc_nbytes;      /* #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 */
#define FD_HAVELAB      0x08            /* got a disklabel */
        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 */
static int      fdprobe(device_t, cfdata_t, void *);
static void     fdattach(device_t, device_t, void *);

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

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    fdstart(struct fd_softc *);

struct dkdriver fddkdriver = {
        .d_strategy = fdstrategy
};

void    fd_set_motor(struct fdc_softc *, int);
void    fd_motor_off(void *);
void    fd_motor_on(void *);
int     fdcresult(struct fdc_softc *);
int     out_fdc(u_char);
void    fdc_ctrl_intr(struct clockframe);
void    fdcstart(struct fdc_softc *);
void    fdcstatus(device_t, int, const char *);
void    fdctimeout(void *);
void    fdcpseudointr(void *);
int     fdcintr(void *);
void    fdcretry(struct fdc_softc *);
void    fdfinish(struct fd_softc *, struct buf *);
int     fdformat(dev_t, struct ne7_fd_formb *, struct proc *);

static void     fdgetdisklabel(struct fd_softc *, dev_t);
static void     fdgetdefaultlabel(struct fd_softc *, struct disklabel *, int);

static struct fd_type *fd_dev_to_type(struct fd_softc *, dev_t);

static int
fdcprobe(device_t parent, cfdata_t cf, void *aux)
{
        static int      fdc_matched = 0;
        bus_space_tag_t mb_tag;
        bus_space_handle_t handle;

        /* Match only once */
        if (strcmp("fdc", aux) || fdc_matched)
                return 0;

        if (!atari_realconfig)
                return 0;

        if ((mb_tag = mb_alloc_bus_space_tag()) == NULL)
                return 0;

        if (bus_space_map(mb_tag, FD_IOBASE, FD_IOSIZE, 0, &handle)) {
                printf("fdcprobe: cannot map io-area\n");
                mb_free_bus_space_tag(mb_tag);
                return 0;
        }
        fdio_addr = bus_space_vaddr(mb_tag, handle);    /* XXX */

#ifdef FD_DEBUG
        printf("fdcprobe: I/O mapping done va: %p\n", fdio_addr);
#endif

        /* reset */
        wrt_fdc_reg(fdout, 0);
        delay(100);
        wrt_fdc_reg(fdout, FDO_FRST);

        /* see if it can handle a command */
        if (out_fdc(NE7CMD_SPECIFY) < 0)
                goto out;
        out_fdc(0xdf);
        out_fdc(7);

        fdc_matched = 1;

 out:
        if (fdc_matched == 0) {
                bus_space_unmap(mb_tag, handle, FD_IOSIZE);
                mb_free_bus_space_tag(mb_tag);
        }

        return fdc_matched;
}

/*
 * 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.
 */
static 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;
}

static void
fdcattach(device_t parent, device_t self, void *aux)
{
        struct fdc_softc        *fdc = device_private(self);
        struct fdc_attach_args  fa;
        int                     has_fifo;

        has_fifo = 0;

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

        out_fdc(NE7CMD_CONFIGURE);
        if (out_fdc(0) == 0) {
                out_fdc(0x1a);  /* No polling, fifo depth = 10  */
                out_fdc(0);

                /* Retain configuration across resets   */
                out_fdc(NE7CMD_LOCK);
                (void)fdcresult(fdc);
                has_fifo = 1;
        } else {
                (void)rd_fdc_reg(fddata);
                aprint_normal(": no fifo");
        }

        aprint_normal("\n");

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

        if (intr_establish(22, USER_VEC|FAST_VEC, 0,
                           (hw_ifun_t)(has_fifo ? mfp_hdfd_fifo : mfp_hdfd_nf),
                           NULL) == NULL) {
                aprint_error_dev(self, "Can't establish interrupt\n");
                return;
        }

        /*
         * Setup the interrupt logic.
         */
        MFP2->mf_iprb  = (u_int8_t)~IB_DCHG;
        MFP2->mf_imrb |= IB_DCHG;
        MFP2->mf_aer  |= 0x10; /* fdc int low->high */

        /* physical limit: four drives per controller. */
        for (fa.fa_drive = 0; fa.fa_drive < 4; fa.fa_drive++) {
                /*
                 * XXX: Choose something sensible as a default...
                 */
                fa.fa_deftype = &fd_types[2]; /* 1.44MB */
                (void)config_found(self, (void *)&fa, fdprint, CFARGS_NONE);
        }
}

static 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;
        int                     n;

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

        /* select drive and turn on motor */
        wrt_fdc_reg(fdout, drive | FDO_FRST | FDO_MOEN(drive));

        /* wait for motor to spin up */
        delay(250000);
        out_fdc(NE7CMD_RECAL);
        out_fdc(drive);

        /* wait for recalibrate */
        delay(2000000);
        out_fdc(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
        intr_arg = (void*)fdc;
        if (n != 2 || (fdc->sc_status[0] & 0xf8) != 0x20)
                return 0;
        /* turn off motor */
        wrt_fdc_reg(fdout, FDO_FRST);

        return 1;
}

/*
 * Controller is working, and drive responded.  Attach it.
 */
static 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)
                aprint_normal(": %s %d cyl, %d head, %d sec\n", type->name,
                    type->tracks, 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(self), &fddkdriver);
        disk_attach(&fd->sc_dk);

        /* Needed to power off if the motor is on when we halt. */
        fd->sc_sdhook = shutdownhook_establish(fd_motor_off, fd);
}

/*
 * This is called from the assembly part of the interrupt handler
 * when it is clear that the interrupt was not related to shoving
 * data.
 */
void
fdc_ctrl_intr(struct clockframe frame)
{
        int     s;

        /*
         * Disable further interrupts. The fdcintr() routine
         * explicitly enables them when needed.
         */
        MFP2->mf_ierb &= ~IB_DCHG;

        /*
         * Set fddmalen to zero so no pseudo-DMA transfers will
         * occur.
         */
        fddmalen = 0;

        if (!BASEPRI(frame.cf_sr)) {
                /*
                 * We don't want to stay on ipl6.....
                 */
                add_sicallback((si_farg)fdcpseudointr, intr_arg, 0);
        } else {
                s = splbio();
                (void) fdcintr(intr_arg);
                splx(s);
        }
}

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;
}

static void
fdstrategy(struct buf *bp)
{
        struct fd_softc *fd = device_lookup_private(&hdfd_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 %d b_bcount %ld blkno %qd cylin %ld sz"
                " %d\n", bp->b_blkno, bp->b_bcount, (long)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;

                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;
}

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

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

static 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);
        wrt_fdc_reg(fdout, status);
}

void
fd_motor_off(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 | FD_MOTOR_WAIT);
        fd_set_motor(fdc, 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)
{
        u_char i;
        int j = 100000,
            n = 0;

        for (; j; j--) {
                i = rd_fdc_reg(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++] = rd_fdc_reg(fddata);
                }
                else
                        delay(10);
        }
        log(LOG_ERR, "fdcresult: timeout\n");
        return -1;
}

int
out_fdc(u_char x)
{
        int i = 100000;

        while (((rd_fdc_reg(fdsts) & (NE7_DIO|NE7_RQM)) != NE7_RQM) && i-- > 0)
                delay(1);
        if (i <= 0)
                return -1;
        wrt_fdc_reg(fddata, x);
        return 0;
}

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

        fd = device_lookup_private(&hdfd_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 &&
            fd->sc_type != type)
                return EBUSY;

        fd->sc_type = type;
        fd->sc_cylin = -1;
        fd->sc_flags |= FD_OPEN;
        fdgetdisklabel(fd, dev);

        return 0;
}

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

        fd->sc_flags &= ~(FD_OPEN|FD_HAVELAB);
        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(struct fdc_softc *fdc)
{
        char bits[64];

        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]);
}

void
fdcstatus(device_t self, int n, const char *s)
{
        struct fdc_softc *fdc = device_private(device_parent(self));
        char bits[64];

        if (n == 0) {
                out_fdc(NE7CMD_SENSEI);
                (void) fdcresult(fdc);
                n = 2;
        }

        printf("%s: %s", device_xname(self), s);

        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:
                fdcpstatus(fdc);
                break;
#ifdef DIAGNOSTIC
        default:
                printf("\nfdcstatus: weird size");
                break;
#endif
        }
}

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

        s = splbio();
        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 st1     fdc->sc_status[1]
#define cyl     fdc->sc_status[1]

        struct fd_softc         *fd;
        struct buf              *bp;
        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;
                fdc->sc_overruns = 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(NE7CMD_SPECIFY);/* specify command */
                out_fdc(fd->sc_type->steprate);
                out_fdc(0x7);   /* XXX head load time == 6ms - non-DMA */

                fdc_ienable();

                out_fdc(NE7CMD_SEEK);   /* seek function */
                out_fdc(fd->sc_drive);  /* drive number */
                out_fdc(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:
                if (finfo)
                        fd->sc_skip = (char *)&(finfo->fd_formb_cylno(0)) -
                                      (char *)finfo;

                type  = fd->sc_type;
                sec   = fd->sc_blkno % type->seccyl;
                head  = sec / type->sectrac;
                sec  -= head * type->sectrac;
                nblks = type->sectrac - 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;
#ifdef DIAGNOSTIC
                {
                     int block;

                     block = (fd->sc_cylin * type->heads + head)
                                * type->sectrac + sec;
                     if (block != fd->sc_blkno) {
                         printf("fdcintr: block %d != blkno %qd\n",
                                                block, fd->sc_blkno);
#ifdef DDB
                         Debugger();
#endif
                     }
                }
#endif
                read = bp->b_flags & B_READ ? 1 : 0;

                /*
                 * Setup pseudo-DMA address & count
                 */
                fddmaaddr = (char *)bp->b_data + fd->sc_skip;
                fddmalen  = fd->sc_nbytes;

                wrt_fdc_reg(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
                fdc_ienable();

                if (finfo) {
                        /* formatting */
                        if (out_fdc(NE7CMD_FORMAT) < 0) {
                                fdc->sc_errors = 4;
                                fdcretry(fdc);
                                goto loop;
                        }
                        out_fdc((head << 2) | fd->sc_drive);
                        out_fdc(finfo->fd_formb_secshift);
                        out_fdc(finfo->fd_formb_nsecs);
                        out_fdc(finfo->fd_formb_gaplen);
                        out_fdc(finfo->fd_formb_fillbyte);
                } else {
                        if (read)
                                out_fdc(NE7CMD_READ);   /* READ */
                        else
                                out_fdc(NE7CMD_WRITE);  /* WRITE */
                        out_fdc((head << 2) | fd->sc_drive);
                        out_fdc(fd->sc_cylin);          /* track         */
                        out_fdc(head);                  /* head          */
                        out_fdc(sec + 1);               /* sector +1     */
                        out_fdc(type->secsize);         /* sector size   */
                        out_fdc(sec + nblks);           /* last sectors  */
                        out_fdc(type->gap1);            /* gap1 size     */
                        out_fdc(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, fdcpseudointr, fdc);
                return 1;

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

                /* Make sure seek really happened. */
                out_fdc(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:
        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 || (st1 & 0x37) != 0) {
                        /*
                         * As the damn chip doesn't seem to have a FIFO,
                         * accept a few overruns as a fact of life *sigh*
                         */
                        if ((st1 & 0x10) && (++fdc->sc_overruns < 4)) {
                                fdc->sc_state = DOSEEK;
                                goto loop;
                        }
#ifdef FD_DEBUG
                        fdcstatus(fd->sc_dev, 7, bp->b_flags & B_READ ?
                            "read failed" : "write failed");
                        printf("blkno %qd nblks %d\n",
                            fd->sc_blkno, fd->sc_nblks);
#endif
                        fdcretry(fdc);
                        goto loop;
                }
                if (fdc->sc_errors) {
                        diskerr(bp, "fd", "soft error", LOG_PRINTF,
                            fd->sc_skip / FDC_BSIZE, (struct disklabel *)NULL);
                        printf("\n");
                        fdc->sc_errors = 0;
                }
                fdc->sc_overruns = 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(NE7CMD_SENSEI);
                        (void) fdcresult(fdc);
                }

                /* fall through */
        case DORECAL:
                fdc_ienable();

                out_fdc(NE7CMD_RECAL);  /* recalibrate function */
                out_fdc(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, fdcpseudointr, fdc);
                return 1;                       /* will return later */

        case RECALCOMPLETE:
                out_fdc(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  st1
#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(fdc);
                }
                bp->b_error = EIO;
                fdfinish(fd, bp);
        }
        fdc->sc_errors++;
}

static int
fdioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l)
{
        struct fd_softc         *fd;
        struct disklabel        buffer;
        int                     error;
        struct fdformat_parms   *form_parms;
        struct fdformat_cmd     *form_cmd;
        struct ne7_fd_formb     *fd_formb;
        unsigned int            scratch;
        int                     il[FD_MAX_NSEC + 1];
        register int            i, j;

        fd = device_lookup_private(&hdfd_cd, FDUNIT(dev));

        switch (cmd) {
        case DIOCGDINFO:
        case DIOCGPARTINFO:
                fdgetdisklabel(fd, dev);
                break;
        }

        error = disk_ioctl(&fd->sc_dk, RAW_PART, 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 DIOCSDINFO:
        case DIOCWDINFO:
                if ((flag & FWRITE) == 0)
                    return EBADF;

                fd->sc_flags &= ~FD_HAVELAB;   /* Invalid */
                error = setdisklabel(&buffer, (struct disklabel *)addr, 0,NULL);
                if (error)
                    return error;

                if (cmd == DIOCWDINFO)
                    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->tracks;
                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;
                case FDC_125KBPS:
                        form_parms->xfer_rate = 125 * 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;
                case 125 * 1024:
                        fd->sc_type->rate = FDC_125KBPS;
                        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->tracks = 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->tracks) {
                        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->l_proc);
                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 proc *p)
{
        int rv = 0;
        struct fd_softc *fd = device_lookup_private(&hdfd_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;
        memset((void *)bp, 0, sizeof(struct buf));
        bp->b_flags = B_PHYS | B_FORMAT;
        bp->b_cflags |= BC_BUSY;
        bp->b_proc = p;
        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 %x count %lx\n", bp->b_blkno, bp->b_bcount);
#endif

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

        /* ...and wait for it to complete */
        mutex_enter(bp->b_objlock);
        while ((bp->b_oflags & BO_DONE) == 0) {
                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;
}


/*
 * Obtain a disklabel. Either a real one from the disk or, if there
 * is none, a fake one.
 */
static void
fdgetdisklabel(struct fd_softc *fd, dev_t dev)
{
        struct disklabel        *lp;
        struct cpu_disklabel    cpulab;

        if (fd->sc_flags & FD_HAVELAB)
                return; /* Already got one */

        lp   = fd->sc_dk.dk_label;

        memset(lp, 0, sizeof(*lp));
        memset(&cpulab, 0, sizeof(cpulab));

        lp->d_secpercyl  = fd->sc_type->seccyl;
        lp->d_type       = DKTYPE_FLOPPY;
        lp->d_secsize    = FDC_BSIZE;
        lp->d_secperunit = fd->sc_type->size;

        /*
         * If there is no label on the disk: fake one
         */
        if (readdisklabel(dev, fdstrategy, lp, &cpulab) != NULL)
                fdgetdefaultlabel(fd, lp, RAW_PART);
        fd->sc_flags |= FD_HAVELAB;

        if ((FDC_BSIZE * fd->sc_type->size)
                < (lp->d_secsize * lp->d_secperunit)) {
                /*
                 * XXX: Ignore these fields. If you drop a vnddisk
                 *      on more than one floppy, you'll get disturbing
                 *      sounds!
                 */
                lp->d_secpercyl  = fd->sc_type->seccyl;
                lp->d_type       = DKTYPE_FLOPPY;
                lp->d_secsize    = FDC_BSIZE;
                lp->d_secperunit = fd->sc_type->size;
        }
}

/*
 * Build defaultdisk label. For now we only create a label from what we
 * know from 'sc'.
 */
static void
fdgetdefaultlabel(struct fd_softc *fd, struct disklabel *lp, int part)
{
        memset(lp, 0, sizeof(struct disklabel));

        lp->d_secsize     = 128 * (1 << fd->sc_type->secsize);
        lp->d_ntracks     = fd->sc_type->heads;
        lp->d_nsectors    = fd->sc_type->sectrac;
        lp->d_secpercyl   = lp->d_ntracks * lp->d_nsectors;
        lp->d_ncylinders  = fd->sc_type->size / lp->d_secpercyl;
        lp->d_secperunit  = fd->sc_type->size;

        lp->d_type        = DKTYPE_FLOPPY;
        lp->d_rpm         = 300;        /* good guess I suppose.        */
        lp->d_interleave  = 1;          /* FIXME: is this OK?           */
        lp->d_bbsize      = 0;
        lp->d_sbsize      = 0;
        lp->d_npartitions = part + 1;
        lp->d_trkseek     = 6000;       /* Who cares...                 */
        lp->d_magic       = DISKMAGIC;
        lp->d_magic2      = DISKMAGIC;
        lp->d_checksum    = dkcksum(lp);
        lp->d_partitions[part].p_size   = lp->d_secperunit;
        lp->d_partitions[part].p_fstype = FS_UNUSED;
        lp->d_partitions[part].p_fsize  = 1024;
        lp->d_partitions[part].p_frag   = 8;
}