* Copyright (c) 1996 Leo Weppelman

/* $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
* [email protected] (John Capo)
* [email protected] (Serge Vakulenko)
* [email protected] (Andrew A. Chernov)
*
* Copyright (c) 1993, 1994, 1995 by
* [email protected] (Joerg Wunsch)
* [email protected] (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;
}