File:  [DragonFly] / src / sys / dev / disk / fd / fd.c
Revision 1.16: download - view: text, annotated - select for diffs
Wed May 19 22:52:41 2004 UTC (10 years, 2 months ago) by dillon
Branches: MAIN
CVS tags: HEAD
Device layer rollup commit.

* cdevsw_add() is now required.  cdevsw_add() and cdevsw_remove() may specify
  a mask/match indicating the range of supported minor numbers.  Multiple
  cdevsw_add()'s using the same major number, but distinctly different
  ranges, may be issued.  All devices that failed to call cdevsw_add() before
  now do.

* cdevsw_remove() now automatically marks all devices within its supported
  range as being destroyed.

* vnode->v_rdev is no longer resolved when the vnode is created.  Instead,
  only v_udev (a newly added field) is resolved.  v_rdev is resolved when
  the vnode is opened and cleared on the last close.

* A great deal of code was making rather dubious assumptions with regards
  to the validity of devices associated with vnodes, primarily due to
  the persistence of a device structure due to being indexed by (major, minor)
  instead of by (cdevsw, major, minor).  In particular, if you run a program
  which connects to a USB device and then you pull the USB device and plug
  it back in, the vnode subsystem will continue to believe that the device
  is open when, in fact, it isn't (because it was destroyed and recreated).

  In particular, note that all the VFS mount procedures now check devices
  via v_udev instead of v_rdev prior to calling VOP_OPEN(), since v_rdev
  is NULL prior to the first open.

* The disk layer's device interaction has been rewritten.  The disk layer
  (i.e. the slice and disklabel management layer) no longer overloads
  its data onto the device structure representing the underlying physical
  disk.  Instead, the disk layer uses the new cdevsw_add() functionality
  to register its own cdevsw using the underlying device's major number,
  and simply does NOT register the underlying device's cdevsw.  No
  confusion is created because the device hash is now based on
  (cdevsw,major,minor) rather then (major,minor).

  NOTE: This also means that underlying raw disk devices may use the entire
  device minor number instead of having to reserve the bits used by the disk
  layer, and also means that can we (theoretically) stack a fully
  disklabel-supported 'disk' on top of any block device.

* The new reference counting scheme prevents this by associating a device
  with a cdevsw and disconnecting the device from its cdevsw when the cdevsw
  is removed.  Additionally, all udev2dev() lookups run through the cdevsw
  mask/match and only successfully find devices still associated with an
  active cdevsw.

* Major work on MFS:  MFS no longer shortcuts vnode and device creation.  It
  now creates a real vnode and a real device and implements real open and
  close VOPs.  Additionally, due to the disk layer changes, MFS is no longer
  limited to 255 mounts.  The new limit is 16 million.  Since MFS creates a
  real device node, mount_mfs will now create a real /dev/mfs<PID> device
  that can be read from userland (e.g. so you can dump an MFS filesystem).

* BUF AND DEVICE STRATEGY changes.  The struct buf contains a b_dev field.
  In order to properly handle stacked devices we now require that the b_dev
  field be initialized before the device strategy routine is called.  This
  required some additional work in various VFS implementations.  To enforce
  this requirement, biodone() now sets b_dev to NODEV.  The new disk layer
  will adjust b_dev before forwarding a request to the actual physical
  device.

* A bug in the ISO CD boot sequence which resulted in a panic has been fixed.

Testing by: lots of people, but David Rhodus found the most aggregious bugs.

/*
 * 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.
 *
 * Libretto PCMCIA floppy support by David Horwitt (dhorwitt@ucsd.edu)
 * aided by the Linux floppy driver modifications from David Bateman
 * (dbateman@eng.uts.edu.au).
 *
 * 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)
 *
 * Copyright (c) 2001 Joerg Wunsch,
 *  joerg_wunsch@uriah.sax.de (Joerg Wunsch)
 *
 * 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.
 *
 *	from:	@(#)fd.c	7.4 (Berkeley) 5/25/91
 * $FreeBSD: src/sys/isa/fd.c,v 1.176.2.8 2002/05/15 21:56:14 joerg Exp $
 * $DragonFly: src/sys/dev/disk/fd/fd.c,v 1.16 2004/05/19 22:52:41 dillon Exp $
 *
 */

#include "opt_fdc.h"
#include "use_pccard.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bootmaj.h>
#include <sys/kernel.h>
#include <sys/buf.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/disklabel.h>
#include <sys/devicestat.h>
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/proc.h>
#include <sys/syslog.h>
#include <sys/device.h>

#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/rman.h>

#include <sys/buf2.h>

#include <machine/clock.h>
#include <machine/ioctl_fd.h>
#include <machine/resource.h>
#include <machine/stdarg.h>

#include <bus/isa/isavar.h>
#include <bus/isa/isareg.h>
#include "fdreg.h"
#include "fdc.h"
#include <bus/isa/rtc.h>

/* misuse a flag to identify format operation */
#define B_FORMAT B_XXX

/* configuration flags */
#define FDC_PRETEND_D0	(1 << 0)	/* pretend drive 0 to be there */
#define FDC_NO_FIFO	(1 << 2)	/* do not enable FIFO  */

/* internally used only, not really from CMOS: */
#define RTCFDT_144M_PRETENDED	0x1000

/* error returns for fd_cmd() */
#define FD_FAILED -1
#define FD_NOT_VALID -2
#define FDC_ERRMAX	100	/* do not log more */
/*
 * Stop retrying after this many DMA overruns.  Since each retry takes
 * one revolution, with 300 rpm., 25 retries take approximately 10
 * seconds which the read attempt will block in case the DMA overrun
 * is persistent.
 */
#define FDC_DMAOV_MAX	25

/*
 * Timeout value for the PIO loops to wait until the FDC main status
 * register matches our expectations (request for master, direction
 * bit).  This is supposed to be a number of microseconds, although
 * timing might actually not be very accurate.
 *
 * Timeouts of 100 msec are believed to be required for some broken
 * (old) hardware.
 */
#define	FDSTS_TIMEOUT	100000

#define NUMTYPES 17
#define NUMDENS  (NUMTYPES - 7)

/* These defines (-1) must match index for fd_types */
#define F_TAPE_TYPE	0x020	/* bit for fd_types to indicate tape */
#define NO_TYPE		0	/* must match NO_TYPE in ft.c */
#define FD_1720         1
#define FD_1480         2
#define FD_1440         3
#define FD_1200         4
#define FD_820          5
#define FD_800          6
#define FD_720          7
#define FD_360          8
#define FD_640          9
#define FD_1232         10

#define FD_1480in5_25   11
#define FD_1440in5_25   12
#define FD_820in5_25    13
#define FD_800in5_25    14
#define FD_720in5_25    15
#define FD_360in5_25    16
#define FD_640in5_25    17


static struct fd_type fd_types[NUMTYPES] =
{
{ 21,2,0xFF,0x04,82,3444,1,FDC_500KBPS,2,0x0C,2 }, /* 1.72M in HD 3.5in */
{ 18,2,0xFF,0x1B,82,2952,1,FDC_500KBPS,2,0x6C,1 }, /* 1.48M in HD 3.5in */
{ 18,2,0xFF,0x1B,80,2880,1,FDC_500KBPS,2,0x6C,1 }, /* 1.44M in HD 3.5in */
{ 15,2,0xFF,0x1B,80,2400,1,FDC_500KBPS,2,0x54,1 }, /*  1.2M in HD 5.25/3.5 */
{ 10,2,0xFF,0x10,82,1640,1,FDC_250KBPS,2,0x2E,1 }, /*  820K in HD 3.5in */
{ 10,2,0xFF,0x10,80,1600,1,FDC_250KBPS,2,0x2E,1 }, /*  800K in HD 3.5in */
{  9,2,0xFF,0x20,80,1440,1,FDC_250KBPS,2,0x50,1 }, /*  720K in HD 3.5in */
{  9,2,0xFF,0x2A,40, 720,1,FDC_250KBPS,2,0x50,1 }, /*  360K in DD 5.25in */
{  8,2,0xFF,0x2A,80,1280,1,FDC_250KBPS,2,0x50,1 }, /*  640K in DD 5.25in */
{  8,3,0xFF,0x35,77,1232,1,FDC_500KBPS,2,0x74,1 }, /* 1.23M in HD 5.25in */

{ 18,2,0xFF,0x02,82,2952,1,FDC_500KBPS,2,0x02,2 }, /* 1.48M in HD 5.25in */
{ 18,2,0xFF,0x02,80,2880,1,FDC_500KBPS,2,0x02,2 }, /* 1.44M in HD 5.25in */
{ 10,2,0xFF,0x10,82,1640,1,FDC_300KBPS,2,0x2E,1 }, /*  820K in HD 5.25in */
{ 10,2,0xFF,0x10,80,1600,1,FDC_300KBPS,2,0x2E,1 }, /*  800K in HD 5.25in */
{  9,2,0xFF,0x20,80,1440,1,FDC_300KBPS,2,0x50,1 }, /*  720K in HD 5.25in */
{  9,2,0xFF,0x23,40, 720,2,FDC_300KBPS,2,0x50,1 }, /*  360K in HD 5.25in */
{  8,2,0xFF,0x2A,80,1280,1,FDC_300KBPS,2,0x50,1 }, /*  640K in HD 5.25in */
};

#define DRVS_PER_CTLR 2		/* 2 floppies */

/***********************************************************************\
* Per controller structure.						*
\***********************************************************************/
devclass_t fdc_devclass;

/***********************************************************************\
* Per drive structure.							*
* N per controller  (DRVS_PER_CTLR)					*
\***********************************************************************/
struct fd_data {
	struct	fdc_data *fdc;	/* pointer to controller structure */
	int	fdsu;		/* this units number on this controller */
	int	type;		/* Drive type (FD_1440...) */
	struct	fd_type *ft;	/* pointer to the type descriptor */
	int	flags;
#define	FD_OPEN		0x01	/* it's open		*/
#define	FD_ACTIVE	0x02	/* it's active		*/
#define	FD_MOTOR	0x04	/* motor should be on	*/
#define	FD_MOTOR_WAIT	0x08	/* motor coming up	*/
	int	skip;
	int	hddrv;
#define FD_NO_TRACK -2
	int	track;		/* where we think the head is */
	int	options;	/* user configurable options, see ioctl_fd.h */
	struct	callout_handle toffhandle;
	struct	callout_handle tohandle;
	struct	devstat device_stats;
	device_t dev;
	fdu_t	fdu;
};

struct fdc_ivars {
	int	fdunit;
};
static devclass_t fd_devclass;

/***********************************************************************\
* Throughout this file the following conventions will be used:		*
* fd is a pointer to the fd_data struct for the drive in question	*
* fdc is a pointer to the fdc_data struct for the controller		*
* fdu is the floppy drive unit number					*
* fdcu is the floppy controller unit number				*
* fdsu is the floppy drive unit number on that controller. (sub-unit)	*
\***********************************************************************/

/* internal functions */
static	void fdc_intr(void *);
static void set_motor(struct fdc_data *, int, int);
#  define TURNON 1
#  define TURNOFF 0
static timeout_t fd_turnoff;
static timeout_t fd_motor_on;
static void fd_turnon(struct fd_data *);
static void fdc_reset(fdc_p);
static int fd_in(struct fdc_data *, int *);
static int out_fdc(struct fdc_data *, int);
static void fdstart(struct fdc_data *);
static timeout_t fd_iotimeout;
static timeout_t fd_pseudointr;
static int fdstate(struct fdc_data *);
static int retrier(struct fdc_data *);
static int fdformat(dev_t, struct fd_formb *, struct thread *);

static int enable_fifo(fdc_p fdc);

static int fifo_threshold = 8;	/* XXX: should be accessible via sysctl */


#define DEVIDLE		0
#define FINDWORK	1
#define	DOSEEK		2
#define SEEKCOMPLETE 	3
#define	IOCOMPLETE	4
#define RECALCOMPLETE	5
#define	STARTRECAL	6
#define	RESETCTLR	7
#define	SEEKWAIT	8
#define	RECALWAIT	9
#define	MOTORWAIT	10
#define	IOTIMEDOUT	11
#define	RESETCOMPLETE	12
#define PIOREAD		13

#ifdef	FDC_DEBUG
static char const * const fdstates[] =
{
"DEVIDLE",
"FINDWORK",
"DOSEEK",
"SEEKCOMPLETE",
"IOCOMPLETE",
"RECALCOMPLETE",
"STARTRECAL",
"RESETCTLR",
"SEEKWAIT",
"RECALWAIT",
"MOTORWAIT",
"IOTIMEDOUT",
"RESETCOMPLETE",
"PIOREAD",
};

/* CAUTION: fd_debug causes huge amounts of logging output */
static int volatile fd_debug = 0;
#define TRACE0(arg) if(fd_debug) printf(arg)
#define TRACE1(arg1, arg2) if(fd_debug) printf(arg1, arg2)
#else /* FDC_DEBUG */
#define TRACE0(arg)
#define TRACE1(arg1, arg2)
#endif /* FDC_DEBUG */

void
fdout_wr(fdc_p fdc, u_int8_t v)
{
	bus_space_write_1(fdc->portt, fdc->porth, FDOUT+fdc->port_off, v);
}

static u_int8_t
fdsts_rd(fdc_p fdc)
{
	return bus_space_read_1(fdc->portt, fdc->porth, FDSTS+fdc->port_off);
}

static void
fddata_wr(fdc_p fdc, u_int8_t v)
{
	bus_space_write_1(fdc->portt, fdc->porth, FDDATA+fdc->port_off, v);
}

static u_int8_t
fddata_rd(fdc_p fdc)
{
	return bus_space_read_1(fdc->portt, fdc->porth, FDDATA+fdc->port_off);
}

static void
fdctl_wr_isa(fdc_p fdc, u_int8_t v)
{
	bus_space_write_1(fdc->ctlt, fdc->ctlh, 0, v);
}

#if 0

static u_int8_t
fdin_rd(fdc_p fdc)
{
	return bus_space_read_1(fdc->portt, fdc->porth, FDIN);
}

#endif

static	d_open_t	Fdopen;	/* NOTE, not fdopen */
static	d_close_t	fdclose;
static	d_ioctl_t	fdioctl;
static	d_strategy_t	fdstrategy;

static struct cdevsw fd_cdevsw = {
	/* name */	"fd",
	/* maj */	FD_CDEV_MAJOR,
	/* flags */	D_DISK,
	/* port */	NULL,
	/* clone */	NULL,

	/* open */	Fdopen,
	/* close */	fdclose,
	/* read */	physread,
	/* write */	physwrite,
	/* ioctl */	fdioctl,
	/* poll */	nopoll,
	/* mmap */	nommap,
	/* strategy */	fdstrategy,
	/* dump */	nodump,
	/* psize */	nopsize
};

static int
fdc_err(struct fdc_data *fdc, const char *s)
{
	fdc->fdc_errs++;
	if (s) {
		if (fdc->fdc_errs < FDC_ERRMAX)
			device_printf(fdc->fdc_dev, "%s", s);
		else if (fdc->fdc_errs == FDC_ERRMAX)
			device_printf(fdc->fdc_dev, "too many errors, not "
						    "logging any more\n");
	}

	return FD_FAILED;
}

/*
 * fd_cmd: Send a command to the chip.  Takes a varargs with this structure:
 * Unit number,
 * # of output bytes, output bytes as ints ...,
 * # of input bytes, input bytes as ints ...
 */
int
fd_cmd(struct fdc_data *fdc, int n_out, ...)
{
	u_char cmd;
	int n_in;
	int n;
	__va_list ap;

	__va_start(ap, n_out);
	cmd = (u_char)(__va_arg(ap, int));
	__va_end(ap);
	__va_start(ap, n_out);
	for (n = 0; n < n_out; n++)
	{
		if (out_fdc(fdc, __va_arg(ap, int)) < 0)
		{
			char msg[50];
			snprintf(msg, sizeof(msg),
				"cmd %x failed at out byte %d of %d\n",
				cmd, n + 1, n_out);
			return fdc_err(fdc, msg);
		}
	}
	n_in = __va_arg(ap, int);
	for (n = 0; n < n_in; n++)
	{
		int *ptr = __va_arg(ap, int *);
		if (fd_in(fdc, ptr) < 0)
		{
			char msg[50];
			snprintf(msg, sizeof(msg),
				"cmd %02x failed at in byte %d of %d\n",
				cmd, n + 1, n_in);
			return fdc_err(fdc, msg);
		}
	}

	return 0;
}

static int 
enable_fifo(fdc_p fdc)
{
	int i, j;

	if ((fdc->flags & FDC_HAS_FIFO) == 0) {
		
		/*
		 * XXX: 
		 * Cannot use fd_cmd the normal way here, since
		 * this might be an invalid command. Thus we send the
		 * first byte, and check for an early turn of data directon.
		 */
		
		if (out_fdc(fdc, I8207X_CONFIGURE) < 0)
			return fdc_err(fdc, "Enable FIFO failed\n");
		
		/* If command is invalid, return */
		j = FDSTS_TIMEOUT;
		while ((i = fdsts_rd(fdc) & (NE7_DIO | NE7_RQM))
		       != NE7_RQM && j-- > 0) {
			if (i == (NE7_DIO | NE7_RQM)) {
				fdc_reset(fdc);
				return FD_FAILED;
			}
			DELAY(1);
		}
		if (j<0 || 
		    fd_cmd(fdc, 3,
			   0, (fifo_threshold - 1) & 0xf, 0, 0) < 0) {
			fdc_reset(fdc);
			return fdc_err(fdc, "Enable FIFO failed\n");
		}
		fdc->flags |= FDC_HAS_FIFO;
		return 0;
	}
	if (fd_cmd(fdc, 4,
		   I8207X_CONFIGURE, 0, (fifo_threshold - 1) & 0xf, 0, 0) < 0)
		return fdc_err(fdc, "Re-enable FIFO failed\n");
	return 0;
}

static int
fd_sense_drive_status(fdc_p fdc, int *st3p)
{
	int st3;

	if (fd_cmd(fdc, 2, NE7CMD_SENSED, fdc->fdu, 1, &st3))
	{
		return fdc_err(fdc, "Sense Drive Status failed\n");
	}
	if (st3p)
		*st3p = st3;

	return 0;
}

static int
fd_sense_int(fdc_p fdc, int *st0p, int *cylp)
{
	int cyl, st0, ret;

	ret = fd_cmd(fdc, 1, NE7CMD_SENSEI, 1, &st0);
	if (ret) {
		(void)fdc_err(fdc,
			      "sense intr err reading stat reg 0\n");
		return ret;
	}

	if (st0p)
		*st0p = st0;

	if ((st0 & NE7_ST0_IC) == NE7_ST0_IC_IV) {
		/*
		 * There doesn't seem to have been an interrupt.
		 */
		return FD_NOT_VALID;
	}

	if (fd_in(fdc, &cyl) < 0) {
		return fdc_err(fdc, "can't get cyl num\n");
	}

	if (cylp)
		*cylp = cyl;

	return 0;
}


static int
fd_read_status(fdc_p fdc, int fdsu)
{
	int i, ret;

	for (i = 0; i < 7; i++) {
		/*
		 * XXX types are poorly chosen.  Only bytes can by read
		 * from the hardware, but fdc->status[] wants u_ints and
		 * fd_in() gives ints.
		 */
		int status;

		ret = fd_in(fdc, &status);
		fdc->status[i] = status;
		if (ret != 0)
			break;
	}

	if (ret == 0)
		fdc->flags |= FDC_STAT_VALID;
	else
		fdc->flags &= ~FDC_STAT_VALID;

	return ret;
}

/****************************************************************************/
/*                      autoconfiguration stuff                             */
/****************************************************************************/

int
fdc_alloc_resources(struct fdc_data *fdc)
{
	device_t dev;
	int ispnp, ispcmcia;

	dev = fdc->fdc_dev;
	ispnp = (fdc->flags & FDC_ISPNP) != 0;
	ispcmcia = (fdc->flags & FDC_ISPCMCIA) != 0;
	fdc->rid_ioport = fdc->rid_irq = fdc->rid_drq = 0;
	fdc->res_ioport = fdc->res_irq = fdc->res_drq = 0;

	/*
	 * On standard ISA, we don't just use an 8 port range
	 * (e.g. 0x3f0-0x3f7) since that covers an IDE control
	 * register at 0x3f6.
	 *
	 * Isn't PC hardware wonderful.
	 *
	 * The Y-E Data PCMCIA FDC doesn't have this problem, it
	 * uses the register with offset 6 for pseudo-DMA, and the
	 * one with offset 7 as control register.
	 */
	fdc->res_ioport = bus_alloc_resource(dev, SYS_RES_IOPORT,
					     &fdc->rid_ioport, 0ul, ~0ul, 
					     ispcmcia ? 8 : (ispnp ? 1 : 6),
					     RF_ACTIVE);
	if (fdc->res_ioport == 0) {
		device_printf(dev, "cannot reserve I/O port range\n");
		return ENXIO;
	}
	fdc->portt = rman_get_bustag(fdc->res_ioport);
	fdc->porth = rman_get_bushandle(fdc->res_ioport);

	if (!ispcmcia) {
		/*
		 * Some BIOSen report the device at 0x3f2-0x3f5,0x3f7
		 * and some at 0x3f0-0x3f5,0x3f7. We detect the former
		 * by checking the size and adjust the port address
		 * accordingly.
		 */
		if (bus_get_resource_count(dev, SYS_RES_IOPORT, 0) == 4)
			fdc->port_off = -2;

		/*
		 * Register the control port range as rid 1 if it
		 * isn't there already. Most PnP BIOSen will have
		 * already done this but non-PnP configurations don't.
		 *
		 * And some (!!) report 0x3f2-0x3f5 and completely
		 * leave out the control register!  It seems that some
		 * non-antique controller chips have a different
		 * method of programming the transfer speed which
		 * doesn't require the control register, but it's
		 * mighty bogus as the chip still responds to the
		 * address for the control register.
		 */
		if (bus_get_resource_count(dev, SYS_RES_IOPORT, 1) == 0) {
			u_long ctlstart;

			/* Find the control port, usually 0x3f7 */
			ctlstart = rman_get_start(fdc->res_ioport) +
				fdc->port_off + 7;

			bus_set_resource(dev, SYS_RES_IOPORT, 1, ctlstart, 1);
		}

		/*
		 * Now (finally!) allocate the control port.
		 */
		fdc->rid_ctl = 1;
		fdc->res_ctl = bus_alloc_resource(dev, SYS_RES_IOPORT,
						  &fdc->rid_ctl,
						  0ul, ~0ul, 1, RF_ACTIVE);
		if (fdc->res_ctl == 0) {
			device_printf(dev,
				      "cannot reserve control I/O port range\n");
			return ENXIO;
		}
		fdc->ctlt = rman_get_bustag(fdc->res_ctl);
		fdc->ctlh = rman_get_bushandle(fdc->res_ctl);
	}

	fdc->res_irq = bus_alloc_resource(dev, SYS_RES_IRQ,
					  &fdc->rid_irq, 0ul, ~0ul, 1, 
					  RF_ACTIVE);
	if (fdc->res_irq == 0) {
		device_printf(dev, "cannot reserve interrupt line\n");
		return ENXIO;
	}

	if ((fdc->flags & FDC_NODMA) == 0) {
		fdc->res_drq = bus_alloc_resource(dev, SYS_RES_DRQ,
						  &fdc->rid_drq, 0ul, ~0ul, 1, 
						  RF_ACTIVE);
		if (fdc->res_drq == 0) {
			device_printf(dev, "cannot reserve DMA request line\n");
			return ENXIO;
		}
		fdc->dmachan = fdc->res_drq->r_start;
	}

	return 0;
}

void
fdc_release_resources(struct fdc_data *fdc)
{
	device_t dev;

	dev = fdc->fdc_dev;
	if (fdc->res_irq != 0) {
		bus_deactivate_resource(dev, SYS_RES_IRQ, fdc->rid_irq,
					fdc->res_irq);
		bus_release_resource(dev, SYS_RES_IRQ, fdc->rid_irq,
				     fdc->res_irq);
	}
	if (fdc->res_ctl != 0) {
		bus_deactivate_resource(dev, SYS_RES_IOPORT, fdc->rid_ctl,
					fdc->res_ctl);
		bus_release_resource(dev, SYS_RES_IOPORT, fdc->rid_ctl,
				     fdc->res_ctl);
	}
	if (fdc->res_ioport != 0) {
		bus_deactivate_resource(dev, SYS_RES_IOPORT, fdc->rid_ioport,
					fdc->res_ioport);
		bus_release_resource(dev, SYS_RES_IOPORT, fdc->rid_ioport,
				     fdc->res_ioport);
	}
	if (fdc->res_drq != 0) {
		bus_deactivate_resource(dev, SYS_RES_DRQ, fdc->rid_drq,
					fdc->res_drq);
		bus_release_resource(dev, SYS_RES_DRQ, fdc->rid_drq,
				     fdc->res_drq);
	}
}

/****************************************************************************/
/*                      autoconfiguration stuff                             */
/****************************************************************************/

static struct isa_pnp_id fdc_ids[] = {
	{0x0007d041, "PC standard floppy disk controller"}, /* PNP0700 */
	{0x0107d041, "Standard floppy controller supporting MS Device Bay Spec"}, /* PNP0701 */
	{0}
};

int
fdc_read_ivar(device_t dev, device_t child, int which, u_long *result)
{
	struct fdc_ivars *ivars = device_get_ivars(child);

	switch (which) {
	case FDC_IVAR_FDUNIT:
		*result = ivars->fdunit;
		break;
	default:
		return ENOENT;
	}
	return 0;
}

/*
 * fdc controller section.
 */
static int
fdc_probe(device_t dev)
{
	int	error, ic_type;
	struct	fdc_data *fdc;

	fdc = device_get_softc(dev);
	bzero(fdc, sizeof *fdc);
	fdc->fdc_dev = dev;
	fdc->fdctl_wr = fdctl_wr_isa;

	/* Check pnp ids */
	error = ISA_PNP_PROBE(device_get_parent(dev), dev, fdc_ids);
	if (error == ENXIO)
		return ENXIO;
	if (error == 0)
		fdc->flags |= FDC_ISPNP;

	/* Attempt to allocate our resources for the duration of the probe */
	error = fdc_alloc_resources(fdc);
	if (error)
		goto out;

	/* First - lets reset the floppy controller */
	fdout_wr(fdc, 0);
	DELAY(100);
	fdout_wr(fdc, FDO_FRST);

	/* see if it can handle a command */
	if (fd_cmd(fdc, 3, NE7CMD_SPECIFY, NE7_SPEC_1(3, 240), 
		   NE7_SPEC_2(2, 0), 0)) {
		error = ENXIO;
		goto out;
	}

	if (fd_cmd(fdc, 1, NE7CMD_VERSION, 1, &ic_type) == 0) {
		ic_type = (u_char)ic_type;
		switch (ic_type) {
		case 0x80:
			device_set_desc(dev, "NEC 765 or clone");
			fdc->fdct = FDC_NE765;
			break;
		case 0x81:
			device_set_desc(dev, "Intel 82077 or clone");
			fdc->fdct = FDC_I82077;
			break;
		case 0x90:
			device_set_desc(dev, "NEC 72065B or clone");
			fdc->fdct = FDC_NE72065;
			break;
		default:
			device_set_desc(dev, "generic floppy controller");
			fdc->fdct = FDC_UNKNOWN;
			break;
		}
	}

out:
	fdc_release_resources(fdc);
	return (error);
}

/*
 * Add a child device to the fdc controller.  It will then be probed etc.
 */
static void
fdc_add_child(device_t dev, const char *name, int unit)
{
	int	disabled;
	struct fdc_ivars *ivar;
	device_t child;

	ivar = malloc(sizeof *ivar, M_DEVBUF /* XXX */, M_WAITOK | M_ZERO);
	if (resource_int_value(name, unit, "drive", &ivar->fdunit) != 0)
		ivar->fdunit = 0;
	child = device_add_child(dev, name, unit);
	if (child == NULL)
		return;
	device_set_ivars(child, ivar);
	if (resource_int_value(name, unit, "disabled", &disabled) == 0
	    && disabled != 0)
		device_disable(child);
}

int
fdc_attach(device_t dev)
{
	struct	fdc_data *fdc;
	int	i, error;

	fdc = device_get_softc(dev);
	error = fdc_alloc_resources(fdc);
	if (error) {
		device_printf(dev, "cannot re-aquire resources\n");
		return error;
	}
	error = BUS_SETUP_INTR(device_get_parent(dev), dev, fdc->res_irq,
			       INTR_TYPE_BIO, fdc_intr, fdc, &fdc->fdc_intr);
	if (error) {
		device_printf(dev, "cannot setup interrupt\n");
		return error;
	}
	fdc->fdcu = device_get_unit(dev);
	fdc->flags |= FDC_ATTACHED;

	if ((fdc->flags & FDC_NODMA) == 0) {
		/* Acquire the DMA channel forever, The driver will do the rest */
				/* XXX should integrate with rman */
		isa_dma_acquire(fdc->dmachan);
		isa_dmainit(fdc->dmachan, 128 << 3 /* XXX max secsize */);
	}
	fdc->state = DEVIDLE;

	/* reset controller, turn motor off, clear fdout mirror reg */
	fdout_wr(fdc, ((fdc->fdout = 0)));
	bufq_init(&fdc->head);

	/*
	 * Probe and attach any children.  We should probably detect
	 * devices from the BIOS unless overridden.
	 */
	for (i = resource_query_string(-1, "at", device_get_nameunit(dev));
	     i != -1;
	     i = resource_query_string(i, "at", device_get_nameunit(dev)))
		fdc_add_child(dev, resource_query_name(i),
			       resource_query_unit(i));

	return (bus_generic_attach(dev));
}

int
fdc_print_child(device_t me, device_t child)
{
	int retval = 0;

	retval += bus_print_child_header(me, child);
	retval += printf(" on %s drive %d\n", device_get_nameunit(me),
	       fdc_get_fdunit(child));
	
	return (retval);
}

static device_method_t fdc_methods[] = {
	/* Device interface */
	DEVMETHOD(device_probe,		fdc_probe),
	DEVMETHOD(device_attach,	fdc_attach),
	DEVMETHOD(device_detach,	bus_generic_detach),
	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
	DEVMETHOD(device_suspend,	bus_generic_suspend),
	DEVMETHOD(device_resume,	bus_generic_resume),

	/* Bus interface */
	DEVMETHOD(bus_print_child,	fdc_print_child),
	DEVMETHOD(bus_read_ivar,	fdc_read_ivar),
	/* Our children never use any other bus interface methods. */

	{ 0, 0 }
};

static driver_t fdc_driver = {
	"fdc",
	fdc_methods,
	sizeof(struct fdc_data)
};

DRIVER_MODULE(fdc, isa, fdc_driver, fdc_devclass, 0, 0);

/******************************************************************/
/*
 * devices attached to the controller section.  
 */
static int
fd_probe(device_t dev)
{
	int	i;
	u_int	fdt, st0, st3;
	struct	fd_data *fd;
	struct	fdc_data *fdc;
	fdsu_t	fdsu;
	static int fd_fifo = 0;

	fdsu = *(int *)device_get_ivars(dev); /* xxx cheat a bit... */
	fd = device_get_softc(dev);
	fdc = device_get_softc(device_get_parent(dev));

	bzero(fd, sizeof *fd);
	fd->dev = dev;
	fd->fdc = fdc;
	fd->fdsu = fdsu;
	fd->fdu = device_get_unit(dev);

#ifdef __i386__
	/* look up what bios thinks we have */
	switch (fd->fdu) {
	case 0:
		if ((fdc->flags & FDC_ISPCMCIA))
			fdt = RTCFDT_144M;
		else if (device_get_flags(fdc->fdc_dev) & FDC_PRETEND_D0)
			fdt = RTCFDT_144M | RTCFDT_144M_PRETENDED;
		else
			fdt = (rtcin(RTC_FDISKETTE) & 0xf0);
		break;
	case 1:
		fdt = ((rtcin(RTC_FDISKETTE) << 4) & 0xf0);
		break;
	default:
		fdt = RTCFDT_NONE;
		break;
	}
#else
	fdt = RTCFDT_144M;	/* XXX probably */
#endif

	/* is there a unit? */
	if (fdt == RTCFDT_NONE)
		return (ENXIO);

	/* select it */
	set_motor(fdc, fdsu, TURNON);
	DELAY(1000000);	/* 1 sec */

	/* XXX This doesn't work before the first set_motor() */
	if (fd_fifo == 0 && fdc->fdct != FDC_NE765 && fdc->fdct != FDC_UNKNOWN
	    && (device_get_flags(fdc->fdc_dev) & FDC_NO_FIFO) == 0
	    && enable_fifo(fdc) == 0) {
		device_printf(device_get_parent(dev),
		    "FIFO enabled, %d bytes threshold\n", fifo_threshold);
	}
	fd_fifo = 1;

	if ((fd_cmd(fdc, 2, NE7CMD_SENSED, fdsu, 1, &st3) == 0)
	    && (st3 & NE7_ST3_T0)) {
		/* if at track 0, first seek inwards */
		/* seek some steps: */
		fd_cmd(fdc, 3, NE7CMD_SEEK, fdsu, 10, 0);
		DELAY(300000); /* ...wait a moment... */
		fd_sense_int(fdc, 0, 0); /* make ctrlr happy */
	}

	/* If we're at track 0 first seek inwards. */
	if ((fd_sense_drive_status(fdc, &st3) == 0) && (st3 & NE7_ST3_T0)) {
		/* Seek some steps... */
		if (fd_cmd(fdc, 3, NE7CMD_SEEK, fdsu, 10, 0) == 0) {
			/* ...wait a moment... */
			DELAY(300000);
			/* make ctrlr happy: */
			fd_sense_int(fdc, 0, 0);
		}
	}

	for (i = 0; i < 2; i++) {
		/*
		 * we must recalibrate twice, just in case the
		 * heads have been beyond cylinder 76, since most
		 * FDCs still barf when attempting to recalibrate
		 * more than 77 steps
		 */
		/* go back to 0: */
		if (fd_cmd(fdc, 2, NE7CMD_RECAL, fdsu, 0) == 0) {
			/* a second being enough for full stroke seek*/
			DELAY(i == 0 ? 1000000 : 300000);

			/* anything responding? */
			if (fd_sense_int(fdc, &st0, 0) == 0 &&
			    (st0 & NE7_ST0_EC) == 0)
				break; /* already probed succesfully */
		}
	}

	set_motor(fdc, fdsu, TURNOFF);

	if (st0 & NE7_ST0_EC) /* no track 0 -> no drive present */
		return (ENXIO);

	fd->track = FD_NO_TRACK;
	fd->fdc = fdc;
	fd->fdsu = fdsu;
	fd->options = 0;
	callout_handle_init(&fd->toffhandle);
	callout_handle_init(&fd->tohandle);

	switch (fdt) {
	case RTCFDT_12M:
		device_set_desc(dev, "1200-KB 5.25\" drive");
		fd->type = FD_1200;
		break;
	case RTCFDT_144M | RTCFDT_144M_PRETENDED:
		device_set_desc(dev, "config-pretended 1440-MB 3.5\" drive");
		fdt = RTCFDT_144M;
		fd->type = FD_1440;
	case RTCFDT_144M:
		device_set_desc(dev, "1440-KB 3.5\" drive");
		fd->type = FD_1440;
		break;
	case RTCFDT_288M:
	case RTCFDT_288M_1:
		device_set_desc(dev, "2880-KB 3.5\" drive (in 1440-KB mode)");
		fd->type = FD_1440;
		break;
	case RTCFDT_360K:
		device_set_desc(dev, "360-KB 5.25\" drive");
		fd->type = FD_360;
		break;
	case RTCFDT_720K:
		printf("720-KB 3.5\" drive");
		fd->type = FD_720;
		break;
	default:
		return (ENXIO);
	}
	return (0);
}

static int
fd_attach(device_t dev)
{
	struct	fd_data *fd;
#if 0
	int	i;
	int	mynor;
	int	typemynor;
	int	typesize;
#endif

	fd = device_get_softc(dev);

	cdevsw_add(&fd_cdevsw, -1 << 6, fd->fdu << 6);
	make_dev(&fd_cdevsw, (fd->fdu << 6),
		UID_ROOT, GID_OPERATOR, 0640, "rfd%d", fd->fdu);

#if 0
	/* Other make_dev() go here. */
#endif

	/*
	 * Export the drive to the devstat interface.
	 */
	devstat_add_entry(&fd->device_stats, device_get_name(dev), 
			  device_get_unit(dev), 512, DEVSTAT_NO_ORDERED_TAGS,
			  DEVSTAT_TYPE_FLOPPY | DEVSTAT_TYPE_IF_OTHER,
			  DEVSTAT_PRIORITY_FD);
	return (0);
}

static int
fd_detach(device_t dev)
{
	struct	fd_data *fd;

	fd = device_get_softc(dev);
	untimeout(fd_turnoff, fd, fd->toffhandle);

	return (0);
}

static device_method_t fd_methods[] = {
	/* Device interface */
	DEVMETHOD(device_probe,		fd_probe),
	DEVMETHOD(device_attach,	fd_attach),
	DEVMETHOD(device_detach,	fd_detach),
	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
	DEVMETHOD(device_suspend,	bus_generic_suspend), /* XXX */
	DEVMETHOD(device_resume,	bus_generic_resume), /* XXX */

	{ 0, 0 }
};

static driver_t fd_driver = {
	"fd",
	fd_methods,
	sizeof(struct fd_data)
};

DRIVER_MODULE(fd, fdc, fd_driver, fd_devclass, 0, 0);

/****************************************************************************/
/*                            motor control stuff                           */
/*		remember to not deselect the drive we're working on         */
/****************************************************************************/
static void
set_motor(struct fdc_data *fdc, int fdsu, int turnon)
{
	int fdout = fdc->fdout;
	int needspecify = 0;

	if(turnon) {
		fdout &= ~FDO_FDSEL;
		fdout |= (FDO_MOEN0 << fdsu) + fdsu;
	} else
		fdout &= ~(FDO_MOEN0 << fdsu);

	if(!turnon
	   && (fdout & (FDO_MOEN0+FDO_MOEN1+FDO_MOEN2+FDO_MOEN3)) == 0)
		/* gonna turn off the last drive, put FDC to bed */
		fdout &= ~ (FDO_FRST|FDO_FDMAEN);
	else {
		/* make sure controller is selected and specified */
		if((fdout & (FDO_FRST|FDO_FDMAEN)) == 0)
			needspecify = 1;
		fdout |= (FDO_FRST|FDO_FDMAEN);
	}

	fdout_wr(fdc, fdout);
	fdc->fdout = fdout;
	TRACE1("[0x%x->FDOUT]", fdout);

	if (needspecify) {
		/*
		 * XXX
		 * special case: since we have just woken up the FDC
		 * from its sleep, we silently assume the command will
		 * be accepted, and do not test for a timeout
		 */
		(void)fd_cmd(fdc, 3, NE7CMD_SPECIFY,
			     NE7_SPEC_1(3, 240), NE7_SPEC_2(2, 0),
			     0);
		if (fdc->flags & FDC_HAS_FIFO)
			(void) enable_fifo(fdc);
	}
}

static void
fd_turnoff(void *xfd)
{
	int	s;
	fd_p fd = xfd;

	TRACE1("[fd%d: turnoff]", fd->fdu);

	s = splbio();
	/*
	 * Don't turn off the motor yet if the drive is active.
	 *
	 * If we got here, this could only mean we missed an interrupt.
	 * This can e. g. happen on the Y-E Date PCMCIA floppy controller
	 * after a controller reset.  Just schedule a pseudo-interrupt
	 * so the state machine gets re-entered.
	 */
	if (fd->fdc->state != DEVIDLE && fd->fdc->fdu == fd->fdu) {
		fdc_intr(fd->fdc);
		splx(s);
		return;
	}

	fd->flags &= ~FD_MOTOR;
	set_motor(fd->fdc, fd->fdsu, TURNOFF);
	splx(s);
}

static void
fd_motor_on(void *xfd)
{
	int	s;
	fd_p fd = xfd;

	s = splbio();
	fd->flags &= ~FD_MOTOR_WAIT;
	if((fd->fdc->fd == fd) && (fd->fdc->state == MOTORWAIT))
	{
		fdc_intr(fd->fdc);
	}
	splx(s);
}

static void
fd_turnon(fd_p fd)
{
	if(!(fd->flags & FD_MOTOR))
	{
		fd->flags |= (FD_MOTOR + FD_MOTOR_WAIT);
		set_motor(fd->fdc, fd->fdsu, TURNON);
		timeout(fd_motor_on, fd, hz); /* in 1 sec its ok */
	}
}

static void
fdc_reset(fdc_p fdc)
{
	/* Try a reset, keep motor on */
	fdout_wr(fdc, fdc->fdout & ~(FDO_FRST|FDO_FDMAEN));
	TRACE1("[0x%x->FDOUT]", fdc->fdout & ~(FDO_FRST|FDO_FDMAEN));
	DELAY(100);
	/* enable FDC, but defer interrupts a moment */
	fdout_wr(fdc, fdc->fdout & ~FDO_FDMAEN);
	TRACE1("[0x%x->FDOUT]", fdc->fdout & ~FDO_FDMAEN);
	DELAY(100);
	fdout_wr(fdc, fdc->fdout);
	TRACE1("[0x%x->FDOUT]", fdc->fdout);

	/* XXX after a reset, silently believe the FDC will accept commands */
	(void)fd_cmd(fdc, 3, NE7CMD_SPECIFY,
		     NE7_SPEC_1(3, 240), NE7_SPEC_2(2, 0),
		     0);
	if (fdc->flags & FDC_HAS_FIFO)
		(void) enable_fifo(fdc);
}

/****************************************************************************/
/*                             fdc in/out                                   */
/****************************************************************************/
/*
 * FDC IO functions, take care of the main status register, timeout
 * in case the desired status bits are never set.
 *
 * These PIO loops initially start out with short delays between
 * each iteration in the expectation that the required condition
 * is usually met quickly, so it can be handled immediately.  After
 * about 1 ms, stepping is increased to achieve a better timing
 * accuracy in the calls to DELAY().
 */
static int
fd_in(struct fdc_data *fdc, int *ptr)
{
	int i, j, step;

	for (j = 0, step = 1;
	    (i = fdsts_rd(fdc) & (NE7_DIO|NE7_RQM)) != (NE7_DIO|NE7_RQM) &&
	    j < FDSTS_TIMEOUT;
	    j += step) {
		if (i == NE7_RQM)
			return (fdc_err(fdc, "ready for output in input\n"));
		if (j == 1000)
			step = 1000;
		DELAY(step);
	}
	if (j >= FDSTS_TIMEOUT)
		return (fdc_err(fdc, bootverbose? "input ready timeout\n": 0));
#ifdef	FDC_DEBUG
	i = fddata_rd(fdc);
	TRACE1("[FDDATA->0x%x]", (unsigned char)i);
	*ptr = i;
	return (0);
#else	/* !FDC_DEBUG */
	i = fddata_rd(fdc);
	if (ptr)
		*ptr = i;
	return (0);
#endif	/* FDC_DEBUG */
}

static int
out_fdc(struct fdc_data *fdc, int x)
{
	int i, j, step;

	for (j = 0, step = 1;
	    (i = fdsts_rd(fdc) & (NE7_DIO|NE7_RQM)) != NE7_RQM &&
	    j < FDSTS_TIMEOUT;
	    j += step) {
		if (i == (NE7_DIO|NE7_RQM))
			return (fdc_err(fdc, "ready for input in output\n"));
		if (j == 1000)
			step = 1000;
		DELAY(step);
	}
	if (j >= FDSTS_TIMEOUT)
		return (fdc_err(fdc, bootverbose? "output ready timeout\n": 0));

	/* Send the command and return */
	fddata_wr(fdc, x);
	TRACE1("[0x%x->FDDATA]", x);
	return (0);
}

/****************************************************************************/
/*                           fdopen/fdclose                                 */
/****************************************************************************/
int
Fdopen(dev_t dev, int flags, int mode, struct thread *td)
{
 	fdu_t fdu = FDUNIT(minor(dev));
	int type = FDTYPE(minor(dev));
	fd_p	fd;
	fdc_p	fdc;

	/* check bounds */
	if ((fd = devclass_get_softc(fd_devclass, fdu)) == 0)
		return (ENXIO);
	fdc = fd->fdc;
	if ((fdc == NULL) || (fd->type == NO_TYPE))
		return (ENXIO);
	if (type > NUMDENS)
		return (ENXIO);
	if (type == 0)
		type = fd->type;
	else {
		/*
		 * For each type of basic drive, make sure we are trying
		 * to open a type it can do,
		 */
		if (type != fd->type) {
			switch (fd->type) {
			case FD_360:
				return (ENXIO);
			case FD_720:
				if (   type != FD_820
				    && type != FD_800
				    && type != FD_640
				   )
					return (ENXIO);
				break;
			case FD_1200:
				switch (type) {
				case FD_1480:
					type = FD_1480in5_25;
					break;
				case FD_1440:
					type = FD_1440in5_25;
					break;
				case FD_1232:
					break;
				case FD_820:
					type = FD_820in5_25;
					break;
				case FD_800:
					type = FD_800in5_25;
					break;
				case FD_720:
					type = FD_720in5_25;
					break;
				case FD_640:
					type = FD_640in5_25;
					break;
				case FD_360:
					type = FD_360in5_25;
					break;
				default:
					return(ENXIO);
				}
				break;
			case FD_1440:
				if (   type != FD_1720
				    && type != FD_1480
				    && type != FD_1200
				    && type != FD_820
				    && type != FD_800
				    && type != FD_720
				    && type != FD_640
				    )
					return(ENXIO);
				break;
			}
		}
	}
	fd->ft = fd_types + type - 1;
	fd->flags |= FD_OPEN;
	/*
	 * Clearing the DMA overrun counter at open time is a bit messy.
	 * Since we're only managing one counter per controller, opening
	 * the second drive could mess it up.  Anyway, if the DMA overrun
	 * condition is really persistent, it will eventually time out
	 * still.  OTOH, clearing it here will ensure we'll at least start
	 * trying again after a previous (maybe even long ago) failure.
	 * Also, this is merely a stop-gap measure only that should not
	 * happen during normal operation, so we can tolerate it to be a
	 * bit sloppy about this.
	 */
	fdc->dma_overruns = 0;

	return 0;
}

int
fdclose(dev_t dev, int flags, int mode, struct thread *td)
{
 	fdu_t fdu = FDUNIT(minor(dev));
	struct fd_data *fd;

	fd = devclass_get_softc(fd_devclass, fdu);
	fd->flags &= ~FD_OPEN;
	fd->options &= ~(FDOPT_NORETRY | FDOPT_NOERRLOG);

	return (0);
}

/****************************************************************************/
/*                               fdstrategy                                 */
/****************************************************************************/
void
fdstrategy(struct buf *bp)
{
	unsigned nblocks, blknum, cando;
 	int	s;
 	fdu_t	fdu;
 	fdc_p	fdc;
 	fd_p	fd;
	size_t	fdblk;

 	fdu = FDUNIT(minor(bp->b_dev));
	fd = devclass_get_softc(fd_devclass, fdu);
	if (fd == 0)
		panic("fdstrategy: buf for nonexistent device (%#lx, %#lx)",
		      (u_long)major(bp->b_dev), (u_long)minor(bp->b_dev));
	fdc = fd->fdc;
	if (fd->type == NO_TYPE) {
		bp->b_error = ENXIO;
		bp->b_flags |= B_ERROR;
		goto bad;
	};

	fdblk = 128 << (fd->ft->secsize);
	if (!(bp->b_flags & B_FORMAT)) {
		if (bp->b_blkno < 0) {
			printf(
		"fd%d: fdstrat: bad request blkno = %lu, bcount = %ld\n",
			       fdu, (u_long)bp->b_blkno, bp->b_bcount);
			bp->b_error = EINVAL;
			bp->b_flags |= B_ERROR;
			goto bad;
		}
		if ((bp->b_bcount % fdblk) != 0) {
			bp->b_error = EINVAL;
			bp->b_flags |= B_ERROR;
			goto bad;
		}
	}

	/*
	 * Set up block calculations.
	 */
	if (bp->b_blkno > 20000000) {
		/*
		 * Reject unreasonably high block number, prevent the
		 * multiplication below from overflowing.
		 */
		bp->b_error = EINVAL;
		bp->b_flags |= B_ERROR;
		goto bad;
	}
	blknum = (unsigned) bp->b_blkno * DEV_BSIZE/fdblk;
 	nblocks = fd->ft->size;
	bp->b_resid = 0;
	if (blknum + (bp->b_bcount / fdblk) > nblocks) {
		if (blknum <= nblocks) {
			cando = (nblocks - blknum) * fdblk;
			bp->b_resid = bp->b_bcount - cando;
			if (cando == 0)
				goto bad;	/* not actually bad but EOF */
		} else {
			bp->b_error = EINVAL;
			bp->b_flags |= B_ERROR;
			goto bad;
		}
	}
 	bp->b_pblkno = bp->b_blkno;
	s = splbio();
	bufqdisksort(&fdc->head, bp);
	untimeout(fd_turnoff, fd, fd->toffhandle); /* a good idea */

	/* Tell devstat we are starting on the transaction */
	devstat_start_transaction(&fd->device_stats);
	device_busy(fd->dev);

	fdstart(fdc);
	splx(s);
	return;

bad:
	biodone(bp);
}

/***************************************************************\
*				fdstart				*
* We have just queued something.. if the controller is not busy	*
* then simulate the case where it has just finished a command	*
* So that it (the interrupt routine) looks on the queue for more*
* work to do and picks up what we just added.			*
* If the controller is already busy, we need do nothing, as it	*
* will pick up our work when the present work completes		*
\***************************************************************/
static void
fdstart(struct fdc_data *fdc)
{
	int s;

	s = splbio();
	if(fdc->state == DEVIDLE)
	{
		fdc_intr(fdc);
	}
	splx(s);
}

static void
fd_iotimeout(void *xfdc)
{
 	fdc_p fdc;
	int s;

	fdc = xfdc;
	TRACE1("fd%d[fd_iotimeout()]", fdc->fdu);

	/*
	 * Due to IBM's brain-dead design, the FDC has a faked ready
	 * signal, hardwired to ready == true. Thus, any command
	 * issued if there's no diskette in the drive will _never_
	 * complete, and must be aborted by resetting the FDC.
	 * Many thanks, Big Blue!
	 * The FDC must not be reset directly, since that would
	 * interfere with the state machine.  Instead, pretend that
	 * the command completed but was invalid.  The state machine
	 * will reset the FDC and retry once.
	 */
	s = splbio();
	fdc->status[0] = NE7_ST0_IC_IV;
	fdc->flags &= ~FDC_STAT_VALID;
	fdc->state = IOTIMEDOUT;
	fdc_intr(fdc);
	splx(s);
}

/* just ensure it has the right spl */
static void
fd_pseudointr(void *xfdc)
{
	int	s;

	s = splbio();
	fdc_intr(xfdc);
	splx(s);
}

/***********************************************************************\
*                                 fdintr				*
* keep calling the state machine until it returns a 0			*
* ALWAYS called at SPLBIO 						*
\***********************************************************************/
static void
fdc_intr(void *xfdc)
{
	fdc_p fdc = xfdc;
	while(fdstate(fdc))
		;
}

/*
 * magic pseudo-DMA initialization for YE FDC. Sets count and
 * direction
 */
#define SET_BCDR(fdc,wr,cnt,port) \
	bus_space_write_1(fdc->portt, fdc->porth, fdc->port_off + port,	 \
	    ((cnt)-1) & 0xff);						 \
	bus_space_write_1(fdc->portt, fdc->porth, fdc->port_off + port + 1, \
	    ((wr ? 0x80 : 0) | ((((cnt)-1) >> 8) & 0x7f)));

/*
 * fdcpio(): perform programmed IO read/write for YE PCMCIA floppy
 */
static int fdcpio(fdc_p fdc, long flags, caddr_t addr, u_int count)
{
	u_char *cptr = (u_char *)addr;

	if (flags & B_READ) {
		if (fdc->state != PIOREAD) {
			fdc->state = PIOREAD;
			return(0);
		};
		SET_BCDR(fdc, 0, count, 0);
		bus_space_read_multi_1(fdc->portt, fdc->porth, fdc->port_off +
		    FDC_YE_DATAPORT, cptr, count);
	} else {
		bus_space_write_multi_1(fdc->portt, fdc->porth, fdc->port_off +
		    FDC_YE_DATAPORT, cptr, count);
		SET_BCDR(fdc, 0, count, 0);
	};
	return(1);
}

/***********************************************************************\
* The controller state machine.						*
* if it returns a non zero value, it should be called again immediatly	*
\***********************************************************************/
static int
fdstate(fdc_p fdc)
{
	int read, format, head, i, sec = 0, sectrac, st0, cyl, st3;
	unsigned blknum = 0, b_cylinder = 0;
	fdu_t fdu = fdc->fdu;
	fd_p fd;
	struct buf *bp;
	struct fd_formb *finfo = NULL;
	size_t fdblk;

	bp = fdc->bp;
	if (bp == NULL) {
		bp = bufq_first(&fdc->head);
		if (bp != NULL) {
			bufq_remove(&fdc->head, bp);
			fdc->bp = bp;
		}
	}
	if (bp == NULL) {
		/***********************************************\
		* nothing left for this controller to do	*
		* Force into the IDLE state,			*
		\***********************************************/
		fdc->state = DEVIDLE;
		if (fdc->fd) {
			device_printf(fdc->fdc_dev,
			    "unexpected valid fd pointer\n");
			fdc->fd = (fd_p) 0;
			fdc->fdu = -1;
		}
		TRACE1("[fdc%d IDLE]", fdc->fdcu);
 		return (0);
	}
	fdu = FDUNIT(minor(bp->b_dev));
	fd = devclass_get_softc(fd_devclass, fdu);
	fdblk = 128 << fd->ft->secsize;
	if (fdc->fd && (fd != fdc->fd))
		device_printf(fd->dev, "confused fd pointers\n");
	read = bp->b_flags & B_READ;
	format = bp->b_flags & B_FORMAT;
	if (format) {
		finfo = (struct fd_formb *)bp->b_data;
		fd->skip = (char *)&(finfo->fd_formb_cylno(0))
			- (char *)finfo;
	}
	if (fdc->state == DOSEEK || fdc->state == SEEKCOMPLETE) {
		blknum = (unsigned) bp->b_pblkno * DEV_BSIZE/fdblk +
			fd->skip/fdblk;
		b_cylinder = blknum / (fd->ft->sectrac * fd->ft->heads);
	}
	TRACE1("fd%d", fdu);
	TRACE1("[%s]", fdstates[fdc->state]);
	TRACE1("(0x%x)", fd->flags);
	untimeout(fd_turnoff, fd, fd->toffhandle);
	fd->toffhandle = timeout(fd_turnoff, fd, 4 * hz);
	switch (fdc->state)
	{
	case DEVIDLE:
	case FINDWORK:	/* we have found new work */
		fdc->retry = 0;
		fd->skip = 0;
		fdc->fd = fd;
		fdc->fdu = fdu;
		fdc->fdctl_wr(fdc, fd->ft->trans);
		TRACE1("[0x%x->FDCTL]", fd->ft->trans);
		/*******************************************************\
		* If the next drive has a motor startup pending, then	*
		* it will start up in its own good time		*
		\*******************************************************/
		if(fd->flags & FD_MOTOR_WAIT) {
			fdc->state = MOTORWAIT;
			return (0); /* come back later */
		}
		/*******************************************************\
		* Maybe if it's not starting, it SHOULD be starting	*
		\*******************************************************/
		if (!(fd->flags & FD_MOTOR))
		{
			fdc->state = MOTORWAIT;
			fd_turnon(fd);
			return (0);
		}
		else	/* at least make sure we are selected */
		{
			set_motor(fdc, fd->fdsu, TURNON);
		}
		if (fdc->flags & FDC_NEEDS_RESET) {
			fdc->state = RESETCTLR;
			fdc->flags &= ~FDC_NEEDS_RESET;
		} else
			fdc->state = DOSEEK;
		break;
	case DOSEEK:
		if (b_cylinder == (unsigned)fd->track)
		{
			fdc->state = SEEKCOMPLETE;
			break;
		}
		if (fd_cmd(fdc, 3, NE7CMD_SEEK,
			   fd->fdsu, b_cylinder * fd->ft->steptrac,
			   0))
		{
			/*
			 * seek command not accepted, looks like
			 * the FDC went off to the Saints...
			 */
			fdc->retry = 6;	/* try a reset */
			return(retrier(fdc));
		}
		fd->track = FD_NO_TRACK;
		fdc->state = SEEKWAIT;
		return(0);	/* will return later */
	case SEEKWAIT:
		/* allow heads to settle */
		timeout(fd_pseudointr, fdc, hz / 16);
		fdc->state = SEEKCOMPLETE;
		return(0);	/* will return later */
	case SEEKCOMPLETE : /* SEEK DONE, START DMA */
		/* Make sure seek really happened*/
		if(fd->track == FD_NO_TRACK) {
			int descyl = b_cylinder * fd->ft->steptrac;
			do {
				/*
				 * This might be a "ready changed" interrupt,
				 * which cannot really happen since the
				 * RDY pin is hardwired to + 5 volts.  This
				 * generally indicates a "bouncing" intr
				 * line, so do one of the following:
				 *
				 * When running on an enhanced FDC that is
				 * known to not go stuck after responding
				 * with INVALID, fetch all interrupt states
				 * until seeing either an INVALID or a
				 * real interrupt condition.
				 *
				 * When running on a dumb old NE765, give
				 * up immediately.  The controller will
				 * provide up to four dummy RC interrupt
				 * conditions right after reset (for the
				 * corresponding four drives), so this is
				 * our only chance to get notice that it
				 * was not the FDC that caused the interrupt.
				 */
				if (fd_sense_int(fdc, &st0, &cyl)
				    == FD_NOT_VALID)
					return 0;
				if(fdc->fdct == FDC_NE765
				   && (st0 & NE7_ST0_IC) == NE7_ST0_IC_RC)
					return 0; /* hope for a real intr */
			} while ((st0 & NE7_ST0_IC) == NE7_ST0_IC_RC);

			if (0 == descyl) {
				int failed = 0;
				/*
				 * seek to cyl 0 requested; make sure we are
				 * really there
				 */
				if (fd_sense_drive_status(fdc, &st3))
					failed = 1;
				if ((st3 & NE7_ST3_T0) == 0) {
					printf(
		"fd%d: Seek to cyl 0, but not really there (ST3 = %b)\n",
					       fdu, st3, NE7_ST3BITS);
					failed = 1;
				}

				if (failed) {
					if(fdc->retry < 3)
						fdc->retry = 3;
					return (retrier(fdc));
				}
			}

			if (cyl != descyl) {
				printf(
		"fd%d: Seek to cyl %d failed; am at cyl %d (ST0 = 0x%x)\n",
				       fdu, descyl, cyl, st0);
				if (fdc->retry < 3)
					fdc->retry = 3;
				return (retrier(fdc));
			}
		}

		fd->track = b_cylinder;
		if (!(fdc->flags & FDC_NODMA))
			isa_dmastart(bp->b_flags, bp->b_data+fd->skip,
				format ? bp->b_bcount : fdblk, fdc->dmachan);
		sectrac = fd->ft->sectrac;
		sec = blknum %  (sectrac * fd->ft->heads);
		head = sec / sectrac;
		sec = sec % sectrac + 1;
		fd->hddrv = ((head&1)<<2)+fdu;

		if(format || !read)
		{
			/* make sure the drive is writable */
			if(fd_sense_drive_status(fdc, &st3) != 0)
			{
				/* stuck controller? */
				if (!(fdc->flags & FDC_NODMA))
					isa_dmadone(bp->b_flags,
						    bp->b_data + fd->skip,
						    format ? bp->b_bcount : fdblk,
						    fdc->dmachan);
				fdc->retry = 6;	/* reset the beast */
				return (retrier(fdc));
			}
			if(st3 & NE7_ST3_WP)
			{
				/*
				 * XXX YES! this is ugly.
				 * in order to force the current operation
				 * to fail, we will have to fake an FDC
				 * error - all error handling is done
				 * by the retrier()
				 */
				fdc->status[0] = NE7_ST0_IC_AT;
				fdc->status[1] = NE7_ST1_NW;
				fdc->status[2] = 0;
				fdc->status[3] = fd->track;
				fdc->status[4] = head;
				fdc->status[5] = sec;
				fdc->retry = 8;	/* break out immediately */
				fdc->state = IOTIMEDOUT; /* not really... */
				return (1);
			}
		}

		if (format) {
			if (fdc->flags & FDC_NODMA) {
				/*
				 * This seems to be necessary for
				 * whatever obscure reason; if we omit
				 * it, we end up filling the sector ID
				 * fields of the newly formatted track
				 * entirely with garbage, causing
				 * `wrong cylinder' errors all over
				 * the place when trying to read them
				 * back.
				 *
				 * Umpf.
				 */
				SET_BCDR(fdc, 1, bp->b_bcount, 0);

				(void)fdcpio(fdc,bp->b_flags,
					bp->b_data+fd->skip,
					bp->b_bcount);

			}
			/* formatting */
			if(fd_cmd(fdc, 6,  NE7CMD_FORMAT, head << 2 | fdu,
				  finfo->fd_formb_secshift,
				  finfo->fd_formb_nsecs,
				  finfo->fd_formb_gaplen,
				  finfo->fd_formb_fillbyte, 0)) {
				/* controller fell over */
				if (!(fdc->flags & FDC_NODMA))
					isa_dmadone(bp->b_flags,
						    bp->b_data + fd->skip,
						    format ? bp->b_bcount : fdblk,
						    fdc->dmachan);
				fdc->retry = 6;
				return (retrier(fdc));
			}
		} else {
			if (fdc->flags & FDC_NODMA) {
				/*
				 * this seems to be necessary even when
				 * reading data
				 */
				SET_BCDR(fdc, 1, fdblk, 0);

				/*
				 * perform the write pseudo-DMA before
				 * the WRITE command is sent
				 */
				if (!read)
					(void)fdcpio(fdc,bp->b_flags,
					    bp->b_data+fd->skip,
					    fdblk);
			}
			if (fd_cmd(fdc, 9,
				   (read ? NE7CMD_READ : NE7CMD_WRITE),
				   head << 2 | fdu,  /* head & unit */
				   fd->track,        /* track */
				   head,
				   sec,              /* sector + 1 */
				   fd->ft->secsize,  /* sector size */
				   sectrac,          /* sectors/track */
				   fd->ft->gap,      /* gap size */
				   fd->ft->datalen,  /* data length */
				   0)) {
				/* the beast is sleeping again */
				if (!(fdc->flags & FDC_NODMA))
					isa_dmadone(bp->b_flags,
						    bp->b_data + fd->skip,
						    format ? bp->b_bcount : fdblk,
						    fdc->dmachan);
				fdc->retry = 6;
				return (retrier(fdc));
			}
		}
		if (fdc->flags & FDC_NODMA)
			/*
			 * if this is a read, then simply await interrupt
			 * before performing PIO
			 */
			if (read && !fdcpio(fdc,bp->b_flags,
			    bp->b_data+fd->skip,fdblk)) {
				fd->tohandle = timeout(fd_iotimeout, fdc, hz);
				return(0);      /* will return later */
			};

		/*
		 * write (or format) operation will fall through and
		 * await completion interrupt
		 */
		fdc->state = IOCOMPLETE;
		fd->tohandle = timeout(fd_iotimeout, fdc, hz);
		return (0);	/* will return later */
	case PIOREAD:
		/* 
		 * actually perform the PIO read.  The IOCOMPLETE case
		 * removes the timeout for us.  
		 */
		(void)fdcpio(fdc,bp->b_flags,bp->b_data+fd->skip,fdblk);
		fdc->state = IOCOMPLETE;
		/* FALLTHROUGH */
	case IOCOMPLETE: /* IO DONE, post-analyze */
		untimeout(fd_iotimeout, fdc, fd->tohandle);

		if (fd_read_status(fdc, fd->fdsu)) {
			if (!(fdc->flags & FDC_NODMA))
				isa_dmadone(bp->b_flags, bp->b_data + fd->skip,
					    format ? bp->b_bcount : fdblk,
					    fdc->dmachan);
			if (fdc->retry < 6)
				fdc->retry = 6;	/* force a reset */
			return (retrier(fdc));
  		}

		fdc->state = IOTIMEDOUT;

		/* FALLTHROUGH */

	case IOTIMEDOUT:
		if (!(fdc->flags & FDC_NODMA))
			isa_dmadone(bp->b_flags, bp->b_data + fd->skip,
				format ? bp->b_bcount : fdblk, fdc->dmachan);
		if (fdc->status[0] & NE7_ST0_IC) {
                        if ((fdc->status[0] & NE7_ST0_IC) == NE7_ST0_IC_AT
			    && fdc->status[1] & NE7_ST1_OR) {
                                /*
				 * DMA overrun. Someone hogged the bus and
				 * didn't release it in time for the next
				 * FDC transfer.
				 *
				 * We normally restart this without bumping
				 * the retry counter.  However, in case
				 * something is seriously messed up (like
				 * broken hardware), we rather limit the
				 * number of retries so the IO operation
				 * doesn't block indefinately.
				 */
				if (fdc->dma_overruns++ < FDC_DMAOV_MAX) {
					fdc->state = SEEKCOMPLETE;
					return (1);
				} /* else fall through */
                        }
			if((fdc->status[0] & NE7_ST0_IC) == NE7_ST0_IC_IV
				&& fdc->retry < 6)
				fdc->retry = 6;	/* force a reset */
			else if((fdc->status[0] & NE7_ST0_IC) == NE7_ST0_IC_AT
				&& fdc->status[2] & NE7_ST2_WC
				&& fdc->retry < 3)
				fdc->retry = 3;	/* force recalibrate */
			return (retrier(fdc));
		}
		/* All OK */
		/* Operation successful, retry DMA overruns again next time. */
		fdc->dma_overruns = 0;
		fd->skip += fdblk;
		if (!format && fd->skip < bp->b_bcount - bp->b_resid) {
			/* set up next transfer */
			fdc->state = DOSEEK;
		} else {
			/* ALL DONE */
			fd->skip = 0;
			fdc->bp = NULL;
			device_unbusy(fd->dev);
			devstat_end_transaction_buf(&fd->device_stats, bp);
			biodone(bp);
			fdc->fd = (fd_p) 0;
			fdc->fdu = -1;
			fdc->state = FINDWORK;
		}
		return (1);
	case RESETCTLR:
		fdc_reset(fdc);
		fdc->retry++;
		fdc->state = RESETCOMPLETE;
		return (0);
	case RESETCOMPLETE:
		/*
		 * Discard all the results from the reset so that they
		 * can't cause an unexpected interrupt later.
		 */
		for (i = 0; i < 4; i++)
			(void)fd_sense_int(fdc, &st0, &cyl);
		fdc->state = STARTRECAL;
		/* Fall through. */
	case STARTRECAL:
		if(fd_cmd(fdc, 2, NE7CMD_RECAL, fdu, 0)) {
			/* arrgl */
			fdc->retry = 6;
			return (retrier(fdc));
		}
		fdc->state = RECALWAIT;
		return (0);	/* will return later */
	case RECALWAIT:
		/* allow heads to settle */
		timeout(fd_pseudointr, fdc, hz / 8);
		fdc->state = RECALCOMPLETE;
		return (0);	/* will return later */
	case RECALCOMPLETE:
		do {
			/*
			 * See SEEKCOMPLETE for a comment on this:
			 */
			if (fd_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
				return 0;
			if(fdc->fdct == FDC_NE765
			   && (st0 & NE7_ST0_IC) == NE7_ST0_IC_RC)
				return 0; /* hope for a real intr */
		} while ((st0 & NE7_ST0_IC) == NE7_ST0_IC_RC);
		if ((st0 & NE7_ST0_IC) != NE7_ST0_IC_NT || cyl != 0)
		{
			if(fdc->retry > 3)
				/*
				 * a recalibrate from beyond cylinder 77
				 * will "fail" due to the FDC limitations;
				 * since people used to complain much about
				 * the failure message, try not logging
				 * this one if it seems to be the first
				 * time in a line
				 */
				printf("fd%d: recal failed ST0 %b cyl %d\n",
				       fdu, st0, NE7_ST0BITS, cyl);
			if(fdc->retry < 3) fdc->retry = 3;
			return (retrier(fdc));
		}
		fd->track = 0;
		/* Seek (probably) necessary */
		fdc->state = DOSEEK;
		return (1);	/* will return immediatly */
	case MOTORWAIT:
		if(fd->flags & FD_MOTOR_WAIT)
		{
			return (0); /* time's not up yet */
		}
		if (fdc->flags & FDC_NEEDS_RESET) {
			fdc->state = RESETCTLR;
			fdc->flags &= ~FDC_NEEDS_RESET;
		} else {
			/*
			 * If all motors were off, then the controller was
			 * reset, so it has lost track of the current
			 * cylinder.  Recalibrate to handle this case.
			 * But first, discard the results of the reset.
			 */
			fdc->state = RESETCOMPLETE;
		}
		return (1);	/* will return immediatly */
	default:
		device_printf(fdc->fdc_dev, "unexpected FD int->");
		if (fd_read_status(fdc, fd->fdsu) == 0)
			printf("FDC status :%x %x %x %x %x %x %x   ",
			       fdc->status[0],
			       fdc->status[1],
			       fdc->status[2],
			       fdc->status[3],
			       fdc->status[4],
			       fdc->status[5],
			       fdc->status[6] );
		else
			printf("No status available   ");
		if (fd_sense_int(fdc, &st0, &cyl) != 0)
		{
			printf("[controller is dead now]\n");
			return (0);
		}
		printf("ST0 = %x, PCN = %x\n", st0, cyl);
		return (0);
	}
	/*XXX confusing: some branches return immediately, others end up here*/
	return (1); /* Come back immediatly to new state */
}

static int
retrier(struct fdc_data *fdc)
{
	struct buf *bp;
	struct fd_data *fd;
	int fdu;

	bp = fdc->bp;

	/* XXX shouldn't this be cached somewhere?  */
	fdu = FDUNIT(minor(bp->b_dev));
	fd = devclass_get_softc(fd_devclass, fdu);
	if (fd->options & FDOPT_NORETRY)
		goto fail;

	switch (fdc->retry) {
	case 0: case 1: case 2:
		fdc->state = SEEKCOMPLETE;
		break;
	case 3: case 4: case 5:
		fdc->state = STARTRECAL;
		break;
	case 6:
		fdc->state = RESETCTLR;
		break;
	case 7:
		break;
	default:
	fail:
		{
			int printerror = (fd->options & FDOPT_NOERRLOG) == 0;
			dev_t sav_b_dev;

			/* Trick diskerr */
			if (printerror) {
				sav_b_dev = bp->b_dev;
				bp->b_dev = make_sub_dev(bp->b_dev,
				    (FDUNIT(minor(bp->b_dev))<<3)|RAW_PART);
				diskerr(bp, "hard error", LOG_PRINTF,
					fdc->fd->skip / DEV_BSIZE,
					(struct disklabel *)NULL);
				bp->b_dev = sav_b_dev;
			}
			if (printerror) {
				if (fdc->flags & FDC_STAT_VALID)
					printf(
			" (ST0 %b ST1 %b ST2 %b cyl %u hd %u sec %u)\n",
					       fdc->status[0], NE7_ST0BITS,
					       fdc->status[1], NE7_ST1BITS,
					       fdc->status[2], NE7_ST2BITS,
					       fdc->status[3], fdc->status[4],
					       fdc->status[5]);
				else
					printf(" (No status)\n");
			}
		}
		bp->b_flags |= B_ERROR;
		bp->b_error = EIO;
		bp->b_resid += bp->b_bcount - fdc->fd->skip;
		fdc->bp = NULL;
		fdc->fd->skip = 0;
		device_unbusy(fd->dev);
		devstat_end_transaction_buf(&fdc->fd->device_stats, bp);
		biodone(bp);
		fdc->state = FINDWORK;
		fdc->flags |= FDC_NEEDS_RESET;
		fdc->fd = (fd_p) 0;
		fdc->fdu = -1;
		return (1);
	}
	fdc->retry++;
	return (1);
}

static int
fdformat(dev_t dev, struct fd_formb *finfo, struct thread *td)
{
	struct proc *p = td->td_proc;
 	fdu_t	fdu;
 	fd_p	fd;

	struct buf *bp;
	int rv = 0, s;
	size_t fdblk;

 	fdu	= FDUNIT(minor(dev));
	fd	= devclass_get_softc(fd_devclass, fdu);
	fdblk = 128 << fd->ft->secsize;

	/* set up a buffer header for fdstrategy() */
	bp = malloc(sizeof(struct buf), M_TEMP, M_WAITOK | M_ZERO);

	/*
	 * keep the process from being swapped
	 */
	PHOLD(p);
	BUF_LOCKINIT(bp);
	BUF_LOCK(bp, LK_EXCLUSIVE);
	bp->b_flags = B_PHYS | B_FORMAT;

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

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

	/* now do the format */
	bp->b_dev = dev;
	BUF_STRATEGY(bp, 0);

	/* ...and wait for it to complete */
	s = splbio();
	while(!(bp->b_flags & B_DONE)) {
		rv = tsleep((caddr_t)bp, 0, "fdform", 20 * hz);
		if (rv == EWOULDBLOCK)
			break;
	}
	splx(s);

	if (rv == EWOULDBLOCK) {
		/* timed out */
		rv = EIO;
		device_unbusy(fd->dev);
		biodone(bp);
	}
	if (bp->b_flags & B_ERROR)
		rv = bp->b_error;
	/*
	 * allow the process to be swapped
	 */
	PRELE(p);
	BUF_UNLOCK(bp);
	BUF_LOCKFREE(bp);
	free(bp, M_TEMP);
	return rv;
}

/*
 * TODO: don't allocate buffer on stack.
 */

static int
fdioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
{
 	fdu_t	fdu = FDUNIT(minor(dev));
 	fd_p	fd = devclass_get_softc(fd_devclass, fdu);
	size_t fdblk;

	struct fd_type *fdt;
	struct disklabel *dl;
	struct fdc_status *fsp;
	char buffer[DEV_BSIZE];
	int error = 0;

	fdblk = 128 << fd->ft->secsize;

	switch (cmd) {
	case DIOCGDINFO:
		bzero(buffer, sizeof (buffer));
		dl = (struct disklabel *)buffer;
		dl->d_secsize = fdblk;
		fdt = fd->ft;
		dl->d_secpercyl = fdt->size / fdt->tracks;
		dl->d_type = DTYPE_FLOPPY;

		if (readdisklabel(dev, dl)
		    == NULL)
			error = 0;
		else
			error = EINVAL;

		*(struct disklabel *)addr = *dl;
		break;

	case DIOCSDINFO:
		if ((flag & FWRITE) == 0)
			error = EBADF;
		break;

	case DIOCWLABEL:
		if ((flag & FWRITE) == 0)
			error = EBADF;
		break;

	case DIOCWDINFO:
		if ((flag & FWRITE) == 0) {
			error = EBADF;
			break;
		}

		dl = (struct disklabel *)addr;

		if ((error = setdisklabel((struct disklabel *)buffer, dl,
					  (u_long)0)) != 0)
			break;

		error = writedisklabel(dev, (struct disklabel *)buffer);
		break;
	case FD_FORM:
		if ((flag & FWRITE) == 0)
			error = EBADF;	/* must be opened for writing */
		else if (((struct fd_formb *)addr)->format_version !=
			FD_FORMAT_VERSION)
			error = EINVAL;	/* wrong version of formatting prog */
		else
			error = fdformat(dev, (struct fd_formb *)addr, td);
		break;

	case FD_GTYPE:                  /* get drive type */
		*(struct fd_type *)addr = *fd->ft;
		break;

	case FD_STYPE:                  /* set drive type */
		/* this is considered harmful; only allow for superuser */
		if (suser(td) != 0)
			return EPERM;
		*fd->ft = *(struct fd_type *)addr;
		break;

	case FD_GOPTS:			/* get drive options */
		*(int *)addr = fd->options;
		break;

	case FD_SOPTS:			/* set drive options */
		fd->options = *(int *)addr;
		break;

	case FD_GSTAT:
		fsp = (struct fdc_status *)addr;
		if ((fd->fdc->flags & FDC_STAT_VALID) == 0)
			return EINVAL;
		memcpy(fsp->status, fd->fdc->status, 7 * sizeof(u_int));
		break;

	default:
		error = ENOTTY;
		break;
	}
	return (error);
}

/*
 * Hello emacs, these are the
 * Local Variables:
 *  c-indent-level:               8
 *  c-continued-statement-offset: 8
 *  c-continued-brace-offset:     0
 *  c-brace-offset:              -8
 *  c-brace-imaginary-offset:     0
 *  c-argdecl-indent:             8
 *  c-label-offset:              -8
 *  c++-hanging-braces:           1
 *  c++-access-specifier-offset: -8
 *  c++-empty-arglist-indent:     8
 *  c++-friend-offset:            0
 * End:
 */