Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 4638 insertions, 0 deletions

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
new file mode 100644
index 000000000000..42dfa281a880
--- /dev/null
+++ b/drivers/block/floppy.c
@@ -0,0 +1,4638 @@
+/*
+ *  linux/drivers/block/floppy.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *  Copyright (C) 1993, 1994  Alain Knaff
+ *  Copyright (C) 1998 Alan Cox
+ */
+/*
+ * 02.12.91 - Changed to static variables to indicate need for reset
+ * and recalibrate. This makes some things easier (output_byte reset
+ * checking etc), and means less interrupt jumping in case of errors,
+ * so the code is hopefully easier to understand.
+ */
+
+/*
+ * This file is certainly a mess. I've tried my best to get it working,
+ * but I don't like programming floppies, and I have only one anyway.
+ * Urgel. I should check for more errors, and do more graceful error
+ * recovery. Seems there are problems with several drives. I've tried to
+ * correct them. No promises.
+ */
+
+/*
+ * As with hd.c, all routines within this file can (and will) be called
+ * by interrupts, so extreme caution is needed. A hardware interrupt
+ * handler may not sleep, or a kernel panic will happen. Thus I cannot
+ * call "floppy-on" directly, but have to set a special timer interrupt
+ * etc.
+ */
+
+/*
+ * 28.02.92 - made track-buffering routines, based on the routines written
+ * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus.
+ */
+
+/*
+ * Automatic floppy-detection and formatting written by Werner Almesberger
+ * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with
+ * the floppy-change signal detection.
+ */
+
+/*
+ * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
+ * FDC data overrun bug, added some preliminary stuff for vertical
+ * recording support.
+ *
+ * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
+ *
+ * TODO: Errors are still not counted properly.
+ */
+
+/* 1992/9/20
+ * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
+ * modeled after the freeware MS-DOS program fdformat/88 V1.8 by
+ * Christoph H. Hochst\"atter.
+ * I have fixed the shift values to the ones I always use. Maybe a new
+ * ioctl() should be created to be able to modify them.
+ * There is a bug in the driver that makes it impossible to format a
+ * floppy as the first thing after bootup.
+ */
+
+/*
+ * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
+ * this helped the floppy driver as well. Much cleaner, and still seems to
+ * work.
+ */
+
+/* 1994/6/24 --bbroad-- added the floppy table entries and made
+ * minor modifications to allow 2.88 floppies to be run.
+ */
+
+/* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
+ * disk types.
+ */
+
+/*
+ * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger
+ * format bug fixes, but unfortunately some new bugs too...
+ */
+
+/* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write
+ * errors to allow safe writing by specialized programs.
+ */
+
+/* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks
+ * by defining bit 1 of the "stretch" parameter to mean put sectors on the
+ * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's
+ * drives are "upside-down").
+ */
+
+/*
+ * 1995/8/26 -- Andreas Busse -- added Mips support.
+ */
+
+/*
+ * 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependent
+ * features to asm/floppy.h.
+ */
+
+/*
+ * 1998/05/07 -- Russell King -- More portability cleanups; moved definition of
+ * interrupt and dma channel to asm/floppy.h. Cleaned up some formatting &
+ * use of '0' for NULL.
+ */
+
+/*
+ * 1998/06/07 -- Alan Cox -- Merged the 2.0.34 fixes for resource allocation
+ * failures.
+ */
+
+/*
+ * 1998/09/20 -- David Weinehall -- Added slow-down code for buggy PS/2-drives.
+ */
+
+/*
+ * 1999/08/13 -- Paul Slootman -- floppy stopped working on Alpha after 24
+ * days, 6 hours, 32 minutes and 32 seconds (i.e. MAXINT jiffies; ints were
+ * being used to store jiffies, which are unsigned longs).
+ */
+
+/*
+ * 2000/08/28 -- Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ * - get rid of check_region
+ * - s/suser/capable/
+ */
+
+/*
+ * 2001/08/26 -- Paul Gortmaker - fix insmod oops on machines with no
+ * floppy controller (lingering task on list after module is gone... boom.)
+ */
+
+/*
+ * 2002/02/07 -- Anton Altaparmakov - Fix io ports reservation to correct range
+ * (0x3f2-0x3f5, 0x3f7). This fix is a bit of a hack but the proper fix
+ * requires many non-obvious changes in arch dependent code.
+ */
+
+/* 2003/07/28 -- Daniele Bellucci <bellucda@tiscali.it>.
+ * Better audit of register_blkdev.
+ */
+
+#define FLOPPY_SANITY_CHECK
+#undef  FLOPPY_SILENT_DCL_CLEAR
+
+#define REALLY_SLOW_IO
+
+#define DEBUGT 2
+#define DCL_DEBUG		/* debug disk change line */
+
+/* do print messages for unexpected interrupts */
+static int print_unex = 1;
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/workqueue.h>
+#define FDPATCHES
+#include <linux/fdreg.h>
+
+/*
+ * 1998/1/21 -- Richard Gooch <rgooch@atnf.csiro.au> -- devfs support
+ */
+
+#include <linux/fd.h>
+#include <linux/hdreg.h>
+
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/bio.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/delay.h>
+#include <linux/mc146818rtc.h>	/* CMOS defines */
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/device.h>
+#include <linux/buffer_head.h>	/* for invalidate_buffers() */
+
+/*
+ * PS/2 floppies have much slower step rates than regular floppies.
+ * It's been recommended that take about 1/4 of the default speed
+ * in some more extreme cases.
+ */
+static int slow_floppy;
+
+#include <asm/dma.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+
+static int FLOPPY_IRQ = 6;
+static int FLOPPY_DMA = 2;
+static int can_use_virtual_dma = 2;
+/* =======
+ * can use virtual DMA:
+ * 0 = use of virtual DMA disallowed by config
+ * 1 = use of virtual DMA prescribed by config
+ * 2 = no virtual DMA preference configured.  By default try hard DMA,
+ * but fall back on virtual DMA when not enough memory available
+ */
+
+static int use_virtual_dma;
+/* =======
+ * use virtual DMA
+ * 0 using hard DMA
+ * 1 using virtual DMA
+ * This variable is set to virtual when a DMA mem problem arises, and
+ * reset back in floppy_grab_irq_and_dma.
+ * It is not safe to reset it in other circumstances, because the floppy
+ * driver may have several buffers in use at once, and we do currently not
+ * record each buffers capabilities
+ */
+
+static DEFINE_SPINLOCK(floppy_lock);
+static struct completion device_release;
+
+static unsigned short virtual_dma_port = 0x3f0;
+irqreturn_t floppy_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static int set_dor(int fdc, char mask, char data);
+static void register_devfs_entries(int drive) __init;
+
+#define K_64	0x10000		/* 64KB */
+
+/* the following is the mask of allowed drives. By default units 2 and
+ * 3 of both floppy controllers are disabled, because switching on the
+ * motor of these drives causes system hangs on some PCI computers. drive
+ * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
+ * a drive is allowed.
+ *
+ * NOTE: This must come before we include the arch floppy header because
+ *       some ports reference this variable from there. -DaveM
+ */
+
+static int allowed_drive_mask = 0x33;
+
+#include <asm/floppy.h>
+
+static int irqdma_allocated;
+
+#define LOCAL_END_REQUEST
+#define DEVICE_NAME "floppy"
+
+#include <linux/blkdev.h>
+#include <linux/blkpg.h>
+#include <linux/cdrom.h>	/* for the compatibility eject ioctl */
+#include <linux/completion.h>
+
+static struct request *current_req;
+static struct request_queue *floppy_queue;
+static void do_fd_request(request_queue_t * q);
+
+#ifndef fd_get_dma_residue
+#define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA)
+#endif
+
+/* Dma Memory related stuff */
+
+#ifndef fd_dma_mem_free
+#define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
+#endif
+
+#ifndef fd_dma_mem_alloc
+#define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL,get_order(size))
+#endif
+
+static inline void fallback_on_nodma_alloc(char **addr, size_t l)
+{
+#ifdef FLOPPY_CAN_FALLBACK_ON_NODMA
+	if (*addr)
+		return;		/* we have the memory */
+	if (can_use_virtual_dma != 2)
+		return;		/* no fallback allowed */
+	printk
+	    ("DMA memory shortage. Temporarily falling back on virtual DMA\n");
+	*addr = (char *)nodma_mem_alloc(l);
+#else
+	return;
+#endif
+}
+
+/* End dma memory related stuff */
+
+static unsigned long fake_change;
+static int initialising = 1;
+
+#define ITYPE(x) (((x)>>2) & 0x1f)
+#define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
+#define UNIT(x) ((x) & 0x03)	/* drive on fdc */
+#define FDC(x) (((x) & 0x04) >> 2)	/* fdc of drive */
+#define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
+				/* reverse mapping from unit and fdc to drive */
+#define DP (&drive_params[current_drive])
+#define DRS (&drive_state[current_drive])
+#define DRWE (&write_errors[current_drive])
+#define FDCS (&fdc_state[fdc])
+#define CLEARF(x) (clear_bit(x##_BIT, &DRS->flags))
+#define SETF(x) (set_bit(x##_BIT, &DRS->flags))
+#define TESTF(x) (test_bit(x##_BIT, &DRS->flags))
+
+#define UDP (&drive_params[drive])
+#define UDRS (&drive_state[drive])
+#define UDRWE (&write_errors[drive])
+#define UFDCS (&fdc_state[FDC(drive)])
+#define UCLEARF(x) (clear_bit(x##_BIT, &UDRS->flags))
+#define USETF(x) (set_bit(x##_BIT, &UDRS->flags))
+#define UTESTF(x) (test_bit(x##_BIT, &UDRS->flags))
+
+#define DPRINT(format, args...) printk(DEVICE_NAME "%d: " format, current_drive , ## args)
+
+#define PH_HEAD(floppy,head) (((((floppy)->stretch & 2) >>1) ^ head) << 2)
+#define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
+
+#define CLEARSTRUCT(x) memset((x), 0, sizeof(*(x)))
+
+/* read/write */
+#define COMMAND raw_cmd->cmd[0]
+#define DR_SELECT raw_cmd->cmd[1]
+#define TRACK raw_cmd->cmd[2]
+#define HEAD raw_cmd->cmd[3]
+#define SECTOR raw_cmd->cmd[4]
+#define SIZECODE raw_cmd->cmd[5]
+#define SECT_PER_TRACK raw_cmd->cmd[6]
+#define GAP raw_cmd->cmd[7]
+#define SIZECODE2 raw_cmd->cmd[8]
+#define NR_RW 9
+
+/* format */
+#define F_SIZECODE raw_cmd->cmd[2]
+#define F_SECT_PER_TRACK raw_cmd->cmd[3]
+#define F_GAP raw_cmd->cmd[4]
+#define F_FILL raw_cmd->cmd[5]
+#define NR_F 6
+
+/*
+ * Maximum disk size (in kilobytes). This default is used whenever the
+ * current disk size is unknown.
+ * [Now it is rather a minimum]
+ */
+#define MAX_DISK_SIZE 4		/* 3984 */
+
+/*
+ * globals used by 'result()'
+ */
+#define MAX_REPLIES 16
+static unsigned char reply_buffer[MAX_REPLIES];
+static int inr;			/* size of reply buffer, when called from interrupt */
+#define ST0 (reply_buffer[0])
+#define ST1 (reply_buffer[1])
+#define ST2 (reply_buffer[2])
+#define ST3 (reply_buffer[0])	/* result of GETSTATUS */
+#define R_TRACK (reply_buffer[3])
+#define R_HEAD (reply_buffer[4])
+#define R_SECTOR (reply_buffer[5])
+#define R_SIZECODE (reply_buffer[6])
+
+#define SEL_DLY (2*HZ/100)
+
+/*
+ * this struct defines the different floppy drive types.
+ */
+static struct {
+	struct floppy_drive_params params;
+	const char *name;	/* name printed while booting */
+} default_drive_params[] = {
+/* NOTE: the time values in jiffies should be in msec!
+ CMOS drive type
+  |     Maximum data rate supported by drive type
+  |     |   Head load time, msec
+  |     |   |   Head unload time, msec (not used)
+  |     |   |   |     Step rate interval, usec
+  |     |   |   |     |       Time needed for spinup time (jiffies)
+  |     |   |   |     |       |      Timeout for spinning down (jiffies)
+  |     |   |   |     |       |      |   Spindown offset (where disk stops)
+  |     |   |   |     |       |      |   |     Select delay
+  |     |   |   |     |       |      |   |     |     RPS
+  |     |   |   |     |       |      |   |     |     |    Max number of tracks
+  |     |   |   |     |       |      |   |     |     |    |     Interrupt timeout
+  |     |   |   |     |       |      |   |     |     |    |     |   Max nonintlv. sectors
+  |     |   |   |     |       |      |   |     |     |    |     |   | -Max Errors- flags */
+{{0,  500, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
+      0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
+
+{{1,  300, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
+      0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
+
+{{2,  500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
+      0, { 2, 5, 6,23,10,20,12, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
+
+{{3,  250, 16, 16, 3000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
+      0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
+
+{{4,  500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
+      0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
+
+{{5, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
+      0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
+
+{{6, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
+      0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
+/*    |  --autodetected formats---    |      |      |
+ *    read_track                      |      |    Name printed when booting
+ *				      |     Native format
+ *	            Frequency of disk change checks */
+};
+
+static struct floppy_drive_params drive_params[N_DRIVE];
+static struct floppy_drive_struct drive_state[N_DRIVE];
+static struct floppy_write_errors write_errors[N_DRIVE];
+static struct timer_list motor_off_timer[N_DRIVE];
+static struct gendisk *disks[N_DRIVE];
+static struct block_device *opened_bdev[N_DRIVE];
+static DECLARE_MUTEX(open_lock);
+static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
+
+/*
+ * This struct defines the different floppy types.
+ *
+ * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
+ * types (e.g. 360kB diskette in 1.2MB drive, etc.).  Bit 1 of 'stretch'
+ * tells if the disk is in Commodore 1581 format, which means side 0 sectors
+ * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
+ * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
+ * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
+ * side 0 is on physical side 0 (but with the misnamed sector IDs).
+ * 'stretch' should probably be renamed to something more general, like
+ * 'options'.  Other parameters should be self-explanatory (see also
+ * setfdprm(8)).
+ */
+/*
+	    Size
+	     |  Sectors per track
+	     |  | Head
+	     |  | |  Tracks
+	     |  | |  | Stretch
+	     |  | |  | |  Gap 1 size
+	     |  | |  | |    |  Data rate, | 0x40 for perp
+	     |  | |  | |    |    |  Spec1 (stepping rate, head unload
+	     |  | |  | |    |    |    |    /fmt gap (gap2) */
+static struct floppy_struct floppy_type[32] = {
+	{    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    },	/*  0 no testing    */
+	{  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
+	{ 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" },	/*  2 1.2MB AT      */
+	{  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  },	/*  3 360KB SS 3.5" */
+	{ 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  },	/*  4 720KB 3.5"    */
+	{  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  },	/*  5 360KB AT      */
+	{ 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  },	/*  6 720KB AT      */
+	{ 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" },	/*  7 1.44MB 3.5"   */
+	{ 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" },	/*  8 2.88MB 3.5"   */
+	{ 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" },	/*  9 3.12MB 3.5"   */
+
+	{ 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
+	{ 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
+	{  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  },	/* 12 410KB 5.25"   */
+	{ 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  },	/* 13 820KB 3.5"    */
+	{ 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" },	/* 14 1.48MB 5.25"  */
+	{ 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" },	/* 15 1.72MB 3.5"   */
+	{  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  },	/* 16 420KB 5.25"   */
+	{ 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  },	/* 17 830KB 3.5"    */
+	{ 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" },	/* 18 1.49MB 5.25"  */
+	{ 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
+
+	{ 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880"  }, /* 20 880KB 5.25"   */
+	{ 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
+	{ 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5"   */
+	{ 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
+	{ 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
+	{ 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
+	{ 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
+	{ 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
+	{ 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
+
+	{ 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5"   */
+	{ 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  },	/* 30 800KB 3.5"    */
+	{ 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
+};
+
+#define	NUMBER(x)	(sizeof(x) / sizeof(*(x)))
+#define SECTSIZE (_FD_SECTSIZE(*floppy))
+
+/* Auto-detection: Disk type used until the next media change occurs. */
+static struct floppy_struct *current_type[N_DRIVE];
+
+/*
+ * User-provided type information. current_type points to
+ * the respective entry of this array.
+ */
+static struct floppy_struct user_params[N_DRIVE];
+
+static sector_t floppy_sizes[256];
+
+/*
+ * The driver is trying to determine the correct media format
+ * while probing is set. rw_interrupt() clears it after a
+ * successful access.
+ */
+static int probing;
+
+/* Synchronization of FDC access. */
+#define FD_COMMAND_NONE -1
+#define FD_COMMAND_ERROR 2
+#define FD_COMMAND_OKAY 3
+
+static volatile int command_status = FD_COMMAND_NONE;
+static unsigned long fdc_busy;
+static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
+static DECLARE_WAIT_QUEUE_HEAD(command_done);
+
+#define NO_SIGNAL (!interruptible || !signal_pending(current))
+#define CALL(x) if ((x) == -EINTR) return -EINTR
+#define ECALL(x) if ((ret = (x))) return ret;
+#define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
+#define WAIT(x) _WAIT((x),interruptible)
+#define IWAIT(x) _WAIT((x),1)
+
+/* Errors during formatting are counted here. */
+static int format_errors;
+
+/* Format request descriptor. */
+static struct format_descr format_req;
+
+/*
+ * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
+ * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
+ * H is head unload time (1=16ms, 2=32ms, etc)
+ */
+
+/*
+ * Track buffer
+ * Because these are written to by the DMA controller, they must
+ * not contain a 64k byte boundary crossing, or data will be
+ * corrupted/lost.
+ */
+static char *floppy_track_buffer;
+static int max_buffer_sectors;
+
+static int *errors;
+typedef void (*done_f) (int);
+static struct cont_t {
+	void (*interrupt) (void);	/* this is called after the interrupt of the
+					 * main command */
+	void (*redo) (void);	/* this is called to retry the operation */
+	void (*error) (void);	/* this is called to tally an error */
+	done_f done;		/* this is called to say if the operation has
+				 * succeeded/failed */
+} *cont;
+
+static void floppy_ready(void);
+static void floppy_start(void);
+static void process_fd_request(void);
+static void recalibrate_floppy(void);
+static void floppy_shutdown(unsigned long);
+
+static int floppy_grab_irq_and_dma(void);
+static void floppy_release_irq_and_dma(void);
+
+/*
+ * The "reset" variable should be tested whenever an interrupt is scheduled,
+ * after the commands have been sent. This is to ensure that the driver doesn't
+ * get wedged when the interrupt doesn't come because of a failed command.
+ * reset doesn't need to be tested before sending commands, because
+ * output_byte is automatically disabled when reset is set.
+ */
+#define CHECK_RESET { if (FDCS->reset){ reset_fdc(); return; } }
+static void reset_fdc(void);
+
+/*
+ * These are global variables, as that's the easiest way to give
+ * information to interrupts. They are the data used for the current
+ * request.
+ */
+#define NO_TRACK -1
+#define NEED_1_RECAL -2
+#define NEED_2_RECAL -3
+
+static int usage_count;
+
+/* buffer related variables */
+static int buffer_track = -1;
+static int buffer_drive = -1;
+static int buffer_min = -1;
+static int buffer_max = -1;
+
+/* fdc related variables, should end up in a struct */
+static struct floppy_fdc_state fdc_state[N_FDC];
+static int fdc;			/* current fdc */
+
+static struct floppy_struct *_floppy = floppy_type;
+static unsigned char current_drive;
+static long current_count_sectors;
+static unsigned char fsector_t;	/* sector in track */
+static unsigned char in_sector_offset;	/* offset within physical sector,
+					 * expressed in units of 512 bytes */
+
+#ifndef fd_eject
+static inline int fd_eject(int drive)
+{
+	return -EINVAL;
+}
+#endif
+
+/*
+ * Debugging
+ * =========
+ */
+#ifdef DEBUGT
+static long unsigned debugtimer;
+
+static inline void set_debugt(void)
+{
+	debugtimer = jiffies;
+}
+
+static inline void debugt(const char *message)
+{
+	if (DP->flags & DEBUGT)
+		printk("%s dtime=%lu\n", message, jiffies - debugtimer);
+}
+#else
+static inline void set_debugt(void) { }
+static inline void debugt(const char *message) { }
+#endif /* DEBUGT */
+
+typedef void (*timeout_fn) (unsigned long);
+static struct timer_list fd_timeout = TIMER_INITIALIZER(floppy_shutdown, 0, 0);
+
+static const char *timeout_message;
+
+#ifdef FLOPPY_SANITY_CHECK
+static void is_alive(const char *message)
+{
+	/* this routine checks whether the floppy driver is "alive" */
+	if (test_bit(0, &fdc_busy) && command_status < 2
+	    && !timer_pending(&fd_timeout)) {
+		DPRINT("timeout handler died: %s\n", message);
+	}
+}
+#endif
+
+static void (*do_floppy) (void) = NULL;
+
+#ifdef FLOPPY_SANITY_CHECK
+
+#define OLOGSIZE 20
+
+static void (*lasthandler) (void);
+static unsigned long interruptjiffies;
+static unsigned long resultjiffies;
+static int resultsize;
+static unsigned long lastredo;
+
+static struct output_log {
+	unsigned char data;
+	unsigned char status;
+	unsigned long jiffies;
+} output_log[OLOGSIZE];
+
+static int output_log_pos;
+#endif
+
+#define current_reqD -1
+#define MAXTIMEOUT -2
+
+static void __reschedule_timeout(int drive, const char *message, int marg)
+{
+	if (drive == current_reqD)
+		drive = current_drive;
+	del_timer(&fd_timeout);
+	if (drive < 0 || drive > N_DRIVE) {
+		fd_timeout.expires = jiffies + 20UL * HZ;
+		drive = 0;
+	} else
+		fd_timeout.expires = jiffies + UDP->timeout;
+	add_timer(&fd_timeout);
+	if (UDP->flags & FD_DEBUG) {
+		DPRINT("reschedule timeout ");
+		printk(message, marg);
+		printk("\n");
+	}
+	timeout_message = message;
+}
+
+static void reschedule_timeout(int drive, const char *message, int marg)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&floppy_lock, flags);
+	__reschedule_timeout(drive, message, marg);
+	spin_unlock_irqrestore(&floppy_lock, flags);
+}
+
+#define INFBOUND(a,b) (a)=max_t(int, a, b)
+
+#define SUPBOUND(a,b) (a)=min_t(int, a, b)
+
+/*
+ * Bottom half floppy driver.
+ * ==========================
+ *
+ * This part of the file contains the code talking directly to the hardware,
+ * and also the main service loop (seek-configure-spinup-command)
+ */
+
+/*
+ * disk change.
+ * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
+ * and the last_checked date.
+ *
+ * last_checked is the date of the last check which showed 'no disk change'
+ * FD_DISK_CHANGE is set under two conditions:
+ * 1. The floppy has been changed after some i/o to that floppy already
+ *    took place.
+ * 2. No floppy disk is in the drive. This is done in order to ensure that
+ *    requests are quickly flushed in case there is no disk in the drive. It
+ *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
+ *    the drive.
+ *
+ * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
+ * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
+ *  each seek. If a disk is present, the disk change line should also be
+ *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
+ *  change line is set, this means either that no disk is in the drive, or
+ *  that it has been removed since the last seek.
+ *
+ * This means that we really have a third possibility too:
+ *  The floppy has been changed after the last seek.
+ */
+
+static int disk_change(int drive)
+{
+	int fdc = FDC(drive);
+#ifdef FLOPPY_SANITY_CHECK
+	if (jiffies - UDRS->select_date < UDP->select_delay)
+		DPRINT("WARNING disk change called early\n");
+	if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
+	    (FDCS->dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
+		DPRINT("probing disk change on unselected drive\n");
+		DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive),
+		       (unsigned int)FDCS->dor);
+	}
+#endif
+
+#ifdef DCL_DEBUG
+	if (UDP->flags & FD_DEBUG) {
+		DPRINT("checking disk change line for drive %d\n", drive);
+		DPRINT("jiffies=%lu\n", jiffies);
+		DPRINT("disk change line=%x\n", fd_inb(FD_DIR) & 0x80);
+		DPRINT("flags=%lx\n", UDRS->flags);
+	}
+#endif
+	if (UDP->flags & FD_BROKEN_DCL)
+		return UTESTF(FD_DISK_CHANGED);
+	if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80) {
+		USETF(FD_VERIFY);	/* verify write protection */
+		if (UDRS->maxblock) {
+			/* mark it changed */
+			USETF(FD_DISK_CHANGED);
+		}
+
+		/* invalidate its geometry */
+		if (UDRS->keep_data >= 0) {
+			if ((UDP->flags & FTD_MSG) &&
+			    current_type[drive] != NULL)
+				DPRINT("Disk type is undefined after "
+				       "disk change\n");
+			current_type[drive] = NULL;
+			floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1;
+		}
+
+		/*USETF(FD_DISK_NEWCHANGE); */
+		return 1;
+	} else {
+		UDRS->last_checked = jiffies;
+		UCLEARF(FD_DISK_NEWCHANGE);
+	}
+	return 0;
+}
+
+static inline int is_selected(int dor, int unit)
+{
+	return ((dor & (0x10 << unit)) && (dor & 3) == unit);
+}
+
+static int set_dor(int fdc, char mask, char data)
+{
+	register unsigned char drive, unit, newdor, olddor;
+
+	if (FDCS->address == -1)
+		return -1;
+
+	olddor = FDCS->dor;
+	newdor = (olddor & mask) | data;
+	if (newdor != olddor) {
+		unit = olddor & 0x3;
+		if (is_selected(olddor, unit) && !is_selected(newdor, unit)) {
+			drive = REVDRIVE(fdc, unit);
+#ifdef DCL_DEBUG
+			if (UDP->flags & FD_DEBUG) {
+				DPRINT("calling disk change from set_dor\n");
+			}
+#endif
+			disk_change(drive);
+		}
+		FDCS->dor = newdor;
+		fd_outb(newdor, FD_DOR);
+
+		unit = newdor & 0x3;
+		if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
+			drive = REVDRIVE(fdc, unit);
+			UDRS->select_date = jiffies;
+		}
+	}
+	/*
+	 *      We should propagate failures to grab the resources back
+	 *      nicely from here. Actually we ought to rewrite the fd
+	 *      driver some day too.
+	 */
+	if (newdor & FLOPPY_MOTOR_MASK)
+		floppy_grab_irq_and_dma();
+	if (olddor & FLOPPY_MOTOR_MASK)
+		floppy_release_irq_and_dma();
+	return olddor;
+}
+
+static void twaddle(void)
+{
+	if (DP->select_delay)
+		return;
+	fd_outb(FDCS->dor & ~(0x10 << UNIT(current_drive)), FD_DOR);
+	fd_outb(FDCS->dor, FD_DOR);
+	DRS->select_date = jiffies;
+}
+
+/* reset all driver information about the current fdc. This is needed after
+ * a reset, and after a raw command. */
+static void reset_fdc_info(int mode)
+{
+	int drive;
+
+	FDCS->spec1 = FDCS->spec2 = -1;
+	FDCS->need_configure = 1;
+	FDCS->perp_mode = 1;
+	FDCS->rawcmd = 0;
+	for (drive = 0; drive < N_DRIVE; drive++)
+		if (FDC(drive) == fdc && (mode || UDRS->track != NEED_1_RECAL))
+			UDRS->track = NEED_2_RECAL;
+}
+
+/* selects the fdc and drive, and enables the fdc's input/dma. */
+static void set_fdc(int drive)
+{
+	if (drive >= 0 && drive < N_DRIVE) {
+		fdc = FDC(drive);
+		current_drive = drive;
+	}
+	if (fdc != 1 && fdc != 0) {
+		printk("bad fdc value\n");
+		return;
+	}
+	set_dor(fdc, ~0, 8);
+#if N_FDC > 1
+	set_dor(1 - fdc, ~8, 0);
+#endif
+	if (FDCS->rawcmd == 2)
+		reset_fdc_info(1);
+	if (fd_inb(FD_STATUS) != STATUS_READY)
+		FDCS->reset = 1;
+}
+
+/* locks the driver */
+static int _lock_fdc(int drive, int interruptible, int line)
+{
+	if (!usage_count) {
+		printk(KERN_ERR
+		       "Trying to lock fdc while usage count=0 at line %d\n",
+		       line);
+		return -1;
+	}
+	if (floppy_grab_irq_and_dma() == -1)
+		return -EBUSY;
+
+	if (test_and_set_bit(0, &fdc_busy)) {
+		DECLARE_WAITQUEUE(wait, current);
+		add_wait_queue(&fdc_wait, &wait);
+
+		for (;;) {
+			set_current_state(TASK_INTERRUPTIBLE);
+
+			if (!test_and_set_bit(0, &fdc_busy))
+				break;
+
+			schedule();
+
+			if (!NO_SIGNAL) {
+				remove_wait_queue(&fdc_wait, &wait);
+				return -EINTR;
+			}
+		}
+
+		set_current_state(TASK_RUNNING);
+		remove_wait_queue(&fdc_wait, &wait);
+	}
+	command_status = FD_COMMAND_NONE;
+
+	__reschedule_timeout(drive, "lock fdc", 0);
+	set_fdc(drive);
+	return 0;
+}
+
+#define lock_fdc(drive,interruptible) _lock_fdc(drive,interruptible, __LINE__)
+
+#define LOCK_FDC(drive,interruptible) \
+if (lock_fdc(drive,interruptible)) return -EINTR;
+
+/* unlocks the driver */
+static inline void unlock_fdc(void)
+{
+	unsigned long flags;
+
+	raw_cmd = NULL;
+	if (!test_bit(0, &fdc_busy))
+		DPRINT("FDC access conflict!\n");
+
+	if (do_floppy)
+		DPRINT("device interrupt still active at FDC release: %p!\n",
+		       do_floppy);
+	command_status = FD_COMMAND_NONE;
+	spin_lock_irqsave(&floppy_lock, flags);
+	del_timer(&fd_timeout);
+	cont = NULL;
+	clear_bit(0, &fdc_busy);
+	if (elv_next_request(floppy_queue))
+		do_fd_request(floppy_queue);
+	spin_unlock_irqrestore(&floppy_lock, flags);
+	floppy_release_irq_and_dma();
+	wake_up(&fdc_wait);
+}
+
+/* switches the motor off after a given timeout */
+static void motor_off_callback(unsigned long nr)
+{
+	unsigned char mask = ~(0x10 << UNIT(nr));
+
+	set_dor(FDC(nr), mask, 0);
+}
+
+/* schedules motor off */
+static void floppy_off(unsigned int drive)
+{
+	unsigned long volatile delta;
+	register int fdc = FDC(drive);
+
+	if (!(FDCS->dor & (0x10 << UNIT(drive))))
+		return;
+
+	del_timer(motor_off_timer + drive);
+
+	/* make spindle stop in a position which minimizes spinup time
+	 * next time */
+	if (UDP->rps) {
+		delta = jiffies - UDRS->first_read_date + HZ -
+		    UDP->spindown_offset;
+		delta = ((delta * UDP->rps) % HZ) / UDP->rps;
+		motor_off_timer[drive].expires =
+		    jiffies + UDP->spindown - delta;
+	}
+	add_timer(motor_off_timer + drive);
+}
+
+/*
+ * cycle through all N_DRIVE floppy drives, for disk change testing.
+ * stopping at current drive. This is done before any long operation, to
+ * be sure to have up to date disk change information.
+ */
+static void scandrives(void)
+{
+	int i, drive, saved_drive;
+
+	if (DP->select_delay)
+		return;
+
+	saved_drive = current_drive;
+	for (i = 0; i < N_DRIVE; i++) {
+		drive = (saved_drive + i + 1) % N_DRIVE;
+		if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
+			continue;	/* skip closed drives */
+		set_fdc(drive);
+		if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
+		      (0x10 << UNIT(drive))))
+			/* switch the motor off again, if it was off to
+			 * begin with */
+			set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
+	}
+	set_fdc(saved_drive);
+}
+
+static void empty(void)
+{
+}
+
+static DECLARE_WORK(floppy_work, NULL, NULL);
+
+static void schedule_bh(void (*handler) (void))
+{
+	PREPARE_WORK(&floppy_work, (void (*)(void *))handler, NULL);
+	schedule_work(&floppy_work);
+}
+
+static struct timer_list fd_timer = TIMER_INITIALIZER(NULL, 0, 0);
+
+static void cancel_activity(void)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&floppy_lock, flags);
+	do_floppy = NULL;
+	PREPARE_WORK(&floppy_work, (void *)empty, NULL);
+	del_timer(&fd_timer);
+	spin_unlock_irqrestore(&floppy_lock, flags);
+}
+
+/* this function makes sure that the disk stays in the drive during the
+ * transfer */
+static void fd_watchdog(void)
+{
+#ifdef DCL_DEBUG
+	if (DP->flags & FD_DEBUG) {
+		DPRINT("calling disk change from watchdog\n");
+	}
+#endif
+
+	if (disk_change(current_drive)) {
+		DPRINT("disk removed during i/o\n");
+		cancel_activity();
+		cont->done(0);
+		reset_fdc();
+	} else {
+		del_timer(&fd_timer);
+		fd_timer.function = (timeout_fn) fd_watchdog;
+		fd_timer.expires = jiffies + HZ / 10;
+		add_timer(&fd_timer);
+	}
+}
+
+static void main_command_interrupt(void)
+{
+	del_timer(&fd_timer);
+	cont->interrupt();
+}
+
+/* waits for a delay (spinup or select) to pass */
+static int fd_wait_for_completion(unsigned long delay, timeout_fn function)
+{
+	if (FDCS->reset) {
+		reset_fdc();	/* do the reset during sleep to win time
+				 * if we don't need to sleep, it's a good
+				 * occasion anyways */
+		return 1;
+	}
+
+	if ((signed)(jiffies - delay) < 0) {
+		del_timer(&fd_timer);
+		fd_timer.function = function;
+		fd_timer.expires = delay;
+		add_timer(&fd_timer);
+		return 1;
+	}
+	return 0;
+}
+
+static DEFINE_SPINLOCK(floppy_hlt_lock);
+static int hlt_disabled;
+static void floppy_disable_hlt(void)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&floppy_hlt_lock, flags);
+	if (!hlt_disabled) {
+		hlt_disabled = 1;
+#ifdef HAVE_DISABLE_HLT
+		disable_hlt();
+#endif
+	}
+	spin_unlock_irqrestore(&floppy_hlt_lock, flags);
+}
+
+static void floppy_enable_hlt(void)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&floppy_hlt_lock, flags);
+	if (hlt_disabled) {
+		hlt_disabled = 0;
+#ifdef HAVE_DISABLE_HLT
+		enable_hlt();
+#endif
+	}
+	spin_unlock_irqrestore(&floppy_hlt_lock, flags);
+}
+
+static void setup_DMA(void)
+{
+	unsigned long f;
+
+#ifdef FLOPPY_SANITY_CHECK
+	if (raw_cmd->length == 0) {
+		int i;
+
+		printk("zero dma transfer size:");
+		for (i = 0; i < raw_cmd->cmd_count; i++)
+			printk("%x,", raw_cmd->cmd[i]);
+		printk("\n");
+		cont->done(0);
+		FDCS->reset = 1;
+		return;
+	}
+	if (((unsigned long)raw_cmd->kernel_data) % 512) {
+		printk("non aligned address: %p\n", raw_cmd->kernel_data);
+		cont->done(0);
+		FDCS->reset = 1;
+		return;
+	}
+#endif
+	f = claim_dma_lock();
+	fd_disable_dma();
+#ifdef fd_dma_setup
+	if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
+			 (raw_cmd->flags & FD_RAW_READ) ?
+			 DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) {
+		release_dma_lock(f);
+		cont->done(0);
+		FDCS->reset = 1;
+		return;
+	}
+	release_dma_lock(f);
+#else
+	fd_clear_dma_ff();
+	fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length);
+	fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ?
+			DMA_MODE_READ : DMA_MODE_WRITE);
+	fd_set_dma_addr(raw_cmd->kernel_data);
+	fd_set_dma_count(raw_cmd->length);
+	virtual_dma_port = FDCS->address;
+	fd_enable_dma();
+	release_dma_lock(f);
+#endif
+	floppy_disable_hlt();
+}
+
+static void show_floppy(void);
+
+/* waits until the fdc becomes ready */
+static int wait_til_ready(void)
+{
+	int counter, status;
+	if (FDCS->reset)
+		return -1;
+	for (counter = 0; counter < 10000; counter++) {
+		status = fd_inb(FD_STATUS);
+		if (status & STATUS_READY)
+			return status;
+	}
+	if (!initialising) {
+		DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
+		show_floppy();
+	}
+	FDCS->reset = 1;
+	return -1;
+}
+
+/* sends a command byte to the fdc */
+static int output_byte(char byte)
+{
+	int status;
+
+	if ((status = wait_til_ready()) < 0)
+		return -1;
+	if ((status & (STATUS_READY | STATUS_DIR | STATUS_DMA)) == STATUS_READY) {
+		fd_outb(byte, FD_DATA);
+#ifdef FLOPPY_SANITY_CHECK
+		output_log[output_log_pos].data = byte;
+		output_log[output_log_pos].status = status;
+		output_log[output_log_pos].jiffies = jiffies;
+		output_log_pos = (output_log_pos + 1) % OLOGSIZE;
+#endif
+		return 0;
+	}
+	FDCS->reset = 1;
+	if (!initialising) {
+		DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
+		       byte, fdc, status);
+		show_floppy();
+	}
+	return -1;
+}
+
+#define LAST_OUT(x) if (output_byte(x)<0){ reset_fdc();return;}
+
+/* gets the response from the fdc */
+static int result(void)
+{
+	int i, status = 0;
+
+	for (i = 0; i < MAX_REPLIES; i++) {
+		if ((status = wait_til_ready()) < 0)
+			break;
+		status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
+		if ((status & ~STATUS_BUSY) == STATUS_READY) {
+#ifdef FLOPPY_SANITY_CHECK
+			resultjiffies = jiffies;
+			resultsize = i;
+#endif
+			return i;
+		}
+		if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
+			reply_buffer[i] = fd_inb(FD_DATA);
+		else
+			break;
+	}
+	if (!initialising) {
+		DPRINT
+		    ("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
+		     fdc, status, i);
+		show_floppy();
+	}
+	FDCS->reset = 1;
+	return -1;
+}
+
+#define MORE_OUTPUT -2
+/* does the fdc need more output? */
+static int need_more_output(void)
+{
+	int status;
+	if ((status = wait_til_ready()) < 0)
+		return -1;
+	if ((status & (STATUS_READY | STATUS_DIR | STATUS_DMA)) == STATUS_READY)
+		return MORE_OUTPUT;
+	return result();
+}
+
+/* Set perpendicular mode as required, based on data rate, if supported.
+ * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
+ */
+static inline void perpendicular_mode(void)
+{
+	unsigned char perp_mode;
+
+	if (raw_cmd->rate & 0x40) {
+		switch (raw_cmd->rate & 3) {
+		case 0:
+			perp_mode = 2;
+			break;
+		case 3:
+			perp_mode = 3;
+			break;
+		default:
+			DPRINT("Invalid data rate for perpendicular mode!\n");
+			cont->done(0);
+			FDCS->reset = 1;	/* convenient way to return to
+						 * redo without to much hassle (deep
+						 * stack et al. */
+			return;
+		}
+	} else
+		perp_mode = 0;
+
+	if (FDCS->perp_mode == perp_mode)
+		return;
+	if (FDCS->version >= FDC_82077_ORIG) {
+		output_byte(FD_PERPENDICULAR);
+		output_byte(perp_mode);
+		FDCS->perp_mode = perp_mode;
+	} else if (perp_mode) {
+		DPRINT("perpendicular mode not supported by this FDC.\n");
+	}
+}				/* perpendicular_mode */
+
+static int fifo_depth = 0xa;
+static int no_fifo;
+
+static int fdc_configure(void)
+{
+	/* Turn on FIFO */
+	output_byte(FD_CONFIGURE);
+	if (need_more_output() != MORE_OUTPUT)
+		return 0;
+	output_byte(0);
+	output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
+	output_byte(0);		/* pre-compensation from track
+				   0 upwards */
+	return 1;
+}
+
+#define NOMINAL_DTR 500
+
+/* Issue a "SPECIFY" command to set the step rate time, head unload time,
+ * head load time, and DMA disable flag to values needed by floppy.
+ *
+ * The value "dtr" is the data transfer rate in Kbps.  It is needed
+ * to account for the data rate-based scaling done by the 82072 and 82077
+ * FDC types.  This parameter is ignored for other types of FDCs (i.e.
+ * 8272a).
+ *
+ * Note that changing the data transfer rate has a (probably deleterious)
+ * effect on the parameters subject to scaling for 82072/82077 FDCs, so
+ * fdc_specify is called again after each data transfer rate
+ * change.
+ *
+ * srt: 1000 to 16000 in microseconds
+ * hut: 16 to 240 milliseconds
+ * hlt: 2 to 254 milliseconds
+ *
+ * These values are rounded up to the next highest available delay time.
+ */
+static void fdc_specify(void)
+{
+	unsigned char spec1, spec2;
+	unsigned long srt, hlt, hut;
+	unsigned long dtr = NOMINAL_DTR;
+	unsigned long scale_dtr = NOMINAL_DTR;
+	int hlt_max_code = 0x7f;
+	int hut_max_code = 0xf;
+
+	if (FDCS->need_configure && FDCS->version >= FDC_82072A) {
+		fdc_configure();
+		FDCS->need_configure = 0;
+		/*DPRINT("FIFO enabled\n"); */
+	}
+
+	switch (raw_cmd->rate & 0x03) {
+	case 3:
+		dtr = 1000;
+		break;
+	case 1:
+		dtr = 300;
+		if (FDCS->version >= FDC_82078) {
+			/* chose the default rate table, not the one
+			 * where 1 = 2 Mbps */
+			output_byte(FD_DRIVESPEC);
+			if (need_more_output() == MORE_OUTPUT) {
+				output_byte(UNIT(current_drive));
+				output_byte(0xc0);
+			}
+		}
+		break;
+	case 2:
+		dtr = 250;
+		break;
+	}
+
+	if (FDCS->version >= FDC_82072) {
+		scale_dtr = dtr;
+		hlt_max_code = 0x00;	/* 0==256msec*dtr0/dtr (not linear!) */
+		hut_max_code = 0x0;	/* 0==256msec*dtr0/dtr (not linear!) */
+	}
+
+	/* Convert step rate from microseconds to milliseconds and 4 bits */
+	srt = 16 - (DP->srt * scale_dtr / 1000 + NOMINAL_DTR - 1) / NOMINAL_DTR;
+	if (slow_floppy) {
+		srt = srt / 4;
+	}
+	SUPBOUND(srt, 0xf);
+	INFBOUND(srt, 0);
+
+	hlt = (DP->hlt * scale_dtr / 2 + NOMINAL_DTR - 1) / NOMINAL_DTR;
+	if (hlt < 0x01)
+		hlt = 0x01;
+	else if (hlt > 0x7f)
+		hlt = hlt_max_code;
+
+	hut = (DP->hut * scale_dtr / 16 + NOMINAL_DTR - 1) / NOMINAL_DTR;
+	if (hut < 0x1)
+		hut = 0x1;
+	else if (hut > 0xf)
+		hut = hut_max_code;
+
+	spec1 = (srt << 4) | hut;
+	spec2 = (hlt << 1) | (use_virtual_dma & 1);
+
+	/* If these parameters did not change, just return with success */
+	if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
+		/* Go ahead and set spec1 and spec2 */
+		output_byte(FD_SPECIFY);
+		output_byte(FDCS->spec1 = spec1);
+		output_byte(FDCS->spec2 = spec2);
+	}
+}				/* fdc_specify */
+
+/* Set the FDC's data transfer rate on behalf of the specified drive.
+ * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
+ * of the specify command (i.e. using the fdc_specify function).
+ */
+static int fdc_dtr(void)
+{
+	/* If data rate not already set to desired value, set it. */
+	if ((raw_cmd->rate & 3) == FDCS->dtr)
+		return 0;
+
+	/* Set dtr */
+	fd_outb(raw_cmd->rate & 3, FD_DCR);
+
+	/* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
+	 * need a stabilization period of several milliseconds to be
+	 * enforced after data rate changes before R/W operations.
+	 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
+	 */
+	FDCS->dtr = raw_cmd->rate & 3;
+	return (fd_wait_for_completion(jiffies + 2UL * HZ / 100,
+				       (timeout_fn) floppy_ready));
+}				/* fdc_dtr */
+
+static void tell_sector(void)
+{
+	printk(": track %d, head %d, sector %d, size %d",
+	       R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
+}				/* tell_sector */
+
+/*
+ * OK, this error interpreting routine is called after a
+ * DMA read/write has succeeded
+ * or failed, so we check the results, and copy any buffers.
+ * hhb: Added better error reporting.
+ * ak: Made this into a separate routine.
+ */
+static int interpret_errors(void)
+{
+	char bad;
+
+	if (inr != 7) {
+		DPRINT("-- FDC reply error");
+		FDCS->reset = 1;
+		return 1;
+	}
+
+	/* check IC to find cause of interrupt */
+	switch (ST0 & ST0_INTR) {
+	case 0x40:		/* error occurred during command execution */
+		if (ST1 & ST1_EOC)
+			return 0;	/* occurs with pseudo-DMA */
+		bad = 1;
+		if (ST1 & ST1_WP) {
+			DPRINT("Drive is write protected\n");
+			CLEARF(FD_DISK_WRITABLE);
+			cont->done(0);
+			bad = 2;
+		} else if (ST1 & ST1_ND) {
+			SETF(FD_NEED_TWADDLE);
+		} else if (ST1 & ST1_OR) {
+			if (DP->flags & FTD_MSG)
+				DPRINT("Over/Underrun - retrying\n");
+			bad = 0;
+		} else if (*errors >= DP->max_errors.reporting) {
+			DPRINT("");
+			if (ST0 & ST0_ECE) {
+				printk("Recalibrate failed!");
+			} else if (ST2 & ST2_CRC) {
+				printk("data CRC error");
+				tell_sector();
+			} else if (ST1 & ST1_CRC) {
+				printk("CRC error");
+				tell_sector();
+			} else if ((ST1 & (ST1_MAM | ST1_ND))
+				   || (ST2 & ST2_MAM)) {
+				if (!probing) {
+					printk("sector not found");
+					tell_sector();
+				} else
+					printk("probe failed...");
+			} else if (ST2 & ST2_WC) {	/* seek error */
+				printk("wrong cylinder");
+			} else if (ST2 & ST2_BC) {	/* cylinder marked as bad */
+				printk("bad cylinder");
+			} else {
+				printk
+				    ("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
+				     ST0, ST1, ST2);
+				tell_sector();
+			}
+			printk("\n");
+
+		}
+		if (ST2 & ST2_WC || ST2 & ST2_BC)
+			/* wrong cylinder => recal */
+			DRS->track = NEED_2_RECAL;
+		return bad;
+	case 0x80:		/* invalid command given */
+		DPRINT("Invalid FDC command given!\n");
+		cont->done(0);
+		return 2;
+	case 0xc0:
+		DPRINT("Abnormal termination caused by polling\n");
+		cont->error();
+		return 2;
+	default:		/* (0) Normal command termination */
+		return 0;
+	}
+}
+
+/*
+ * This routine is called when everything should be correctly set up
+ * for the transfer (i.e. floppy motor is on, the correct floppy is
+ * selected, and the head is sitting on the right track).
+ */
+static void setup_rw_floppy(void)
+{
+	int i, r, flags, dflags;
+	unsigned long ready_date;
+	timeout_fn function;
+
+	flags = raw_cmd->flags;
+	if (flags & (FD_RAW_READ | FD_RAW_WRITE))
+		flags |= FD_RAW_INTR;
+
+	if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
+		ready_date = DRS->spinup_date + DP->spinup;
+		/* If spinup will take a long time, rerun scandrives
+		 * again just before spinup completion. Beware that
+		 * after scandrives, we must again wait for selection.
+		 */
+		if ((signed)(ready_date - jiffies) > DP->select_delay) {
+			ready_date -= DP->select_delay;
+			function = (timeout_fn) floppy_start;
+		} else
+			function = (timeout_fn) setup_rw_floppy;
+
+		/* wait until the floppy is spinning fast enough */
+		if (fd_wait_for_completion(ready_date, function))
+			return;
+	}
+	dflags = DRS->flags;
+
+	if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
+		setup_DMA();
+
+	if (flags & FD_RAW_INTR)
+		do_floppy = main_command_interrupt;
+
+	r = 0;
+	for (i = 0; i < raw_cmd->cmd_count; i++)
+		r |= output_byte(raw_cmd->cmd[i]);
+
+	debugt("rw_command: ");
+
+	if (r) {
+		cont->error();
+		reset_fdc();
+		return;
+	}
+
+	if (!(flags & FD_RAW_INTR)) {
+		inr = result();
+		cont->interrupt();
+	} else if (flags & FD_RAW_NEED_DISK)
+		fd_watchdog();
+}
+
+static int blind_seek;
+
+/*
+ * This is the routine called after every seek (or recalibrate) interrupt
+ * from the floppy controller.
+ */
+static void seek_interrupt(void)
+{
+	debugt("seek interrupt:");
+	if (inr != 2 || (ST0 & 0xF8) != 0x20) {
+		DPRINT("seek failed\n");
+		DRS->track = NEED_2_RECAL;
+		cont->error();
+		cont->redo();
+		return;
+	}
+	if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) {
+#ifdef DCL_DEBUG
+		if (DP->flags & FD_DEBUG) {
+			DPRINT
+			    ("clearing NEWCHANGE flag because of effective seek\n");
+			DPRINT("jiffies=%lu\n", jiffies);
+		}
+#endif
+		CLEARF(FD_DISK_NEWCHANGE);	/* effective seek */
+		DRS->select_date = jiffies;
+	}
+	DRS->track = ST1;
+	floppy_ready();
+}
+
+static void check_wp(void)
+{
+	if (TESTF(FD_VERIFY)) {
+		/* check write protection */
+		output_byte(FD_GETSTATUS);
+		output_byte(UNIT(current_drive));
+		if (result() != 1) {
+			FDCS->reset = 1;
+			return;
+		}
+		CLEARF(FD_VERIFY);
+		CLEARF(FD_NEED_TWADDLE);
+#ifdef DCL_DEBUG
+		if (DP->flags & FD_DEBUG) {
+			DPRINT("checking whether disk is write protected\n");
+			DPRINT("wp=%x\n", ST3 & 0x40);
+		}
+#endif
+		if (!(ST3 & 0x40))
+			SETF(FD_DISK_WRITABLE);
+		else
+			CLEARF(FD_DISK_WRITABLE);
+	}
+}
+
+static void seek_floppy(void)
+{
+	int track;
+
+	blind_seek = 0;
+
+#ifdef DCL_DEBUG
+	if (DP->flags & FD_DEBUG) {
+		DPRINT("calling disk change from seek\n");
+	}
+#endif
+
+	if (!TESTF(FD_DISK_NEWCHANGE) &&
+	    disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
+		/* the media changed flag should be cleared after the seek.
+		 * If it isn't, this means that there is really no disk in
+		 * the drive.
+		 */
+		SETF(FD_DISK_CHANGED);
+		cont->done(0);
+		cont->redo();
+		return;
+	}
+	if (DRS->track <= NEED_1_RECAL) {
+		recalibrate_floppy();
+		return;
+	} else if (TESTF(FD_DISK_NEWCHANGE) &&
+		   (raw_cmd->flags & FD_RAW_NEED_DISK) &&
+		   (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
+		/* we seek to clear the media-changed condition. Does anybody
+		 * know a more elegant way, which works on all drives? */
+		if (raw_cmd->track)
+			track = raw_cmd->track - 1;
+		else {
+			if (DP->flags & FD_SILENT_DCL_CLEAR) {
+				set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
+				blind_seek = 1;
+				raw_cmd->flags |= FD_RAW_NEED_SEEK;
+			}
+			track = 1;
+		}
+	} else {
+		check_wp();
+		if (raw_cmd->track != DRS->track &&
+		    (raw_cmd->flags & FD_RAW_NEED_SEEK))
+			track = raw_cmd->track;
+		else {
+			setup_rw_floppy();
+			return;
+		}
+	}
+
+	do_floppy = seek_interrupt;
+	output_byte(FD_SEEK);
+	output_byte(UNIT(current_drive));
+	LAST_OUT(track);
+	debugt("seek command:");
+}
+
+static void recal_interrupt(void)
+{
+	debugt("recal interrupt:");
+	if (inr != 2)
+		FDCS->reset = 1;
+	else if (ST0 & ST0_ECE) {
+		switch (DRS->track) {
+		case NEED_1_RECAL:
+			debugt("recal interrupt need 1 recal:");
+			/* after a second recalibrate, we still haven't
+			 * reached track 0. Probably no drive. Raise an
+			 * error, as failing immediately might upset
+			 * computers possessed by the Devil :-) */
+			cont->error();
+			cont->redo();
+			return;
+		case NEED_2_RECAL:
+			debugt("recal interrupt need 2 recal:");
+			/* If we already did a recalibrate,
+			 * and we are not at track 0, this
+			 * means we have moved. (The only way
+			 * not to move at recalibration is to
+			 * be already at track 0.) Clear the
+			 * new change flag */
+#ifdef DCL_DEBUG
+			if (DP->flags & FD_DEBUG) {
+				DPRINT
+				    ("clearing NEWCHANGE flag because of second recalibrate\n");
+			}
+#endif
+
+			CLEARF(FD_DISK_NEWCHANGE);
+			DRS->select_date = jiffies;
+			/* fall through */
+		default:
+			debugt("recal interrupt default:");
+			/* Recalibrate moves the head by at
+			 * most 80 steps. If after one
+			 * recalibrate we don't have reached
+			 * track 0, this might mean that we
+			 * started beyond track 80.  Try
+			 * again.  */
+			DRS->track = NEED_1_RECAL;
+			break;
+		}
+	} else
+		DRS->track = ST1;
+	floppy_ready();
+}
+
+static void print_result(char *message, int inr)
+{
+	int i;
+
+	DPRINT("%s ", message);
+	if (inr >= 0)
+		for (i = 0; i < inr; i++)
+			printk("repl[%d]=%x ", i, reply_buffer[i]);
+	printk("\n");
+}
+
+/* interrupt handler. Note that this can be called externally on the Sparc */
+irqreturn_t floppy_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	void (*handler) (void) = do_floppy;
+	int do_print;
+	unsigned long f;
+
+	lasthandler = handler;
+	interruptjiffies = jiffies;
+
+	f = claim_dma_lock();
+	fd_disable_dma();
+	release_dma_lock(f);
+
+	floppy_enable_hlt();
+	do_floppy = NULL;
+	if (fdc >= N_FDC || FDCS->address == -1) {
+		/* we don't even know which FDC is the culprit */
+		printk("DOR0=%x\n", fdc_state[0].dor);
+		printk("floppy interrupt on bizarre fdc %d\n", fdc);
+		printk("handler=%p\n", handler);
+		is_alive("bizarre fdc");
+		return IRQ_NONE;
+	}
+
+	FDCS->reset = 0;
+	/* We have to clear the reset flag here, because apparently on boxes
+	 * with level triggered interrupts (PS/2, Sparc, ...), it is needed to
+	 * emit SENSEI's to clear the interrupt line. And FDCS->reset blocks the
+	 * emission of the SENSEI's.
+	 * It is OK to emit floppy commands because we are in an interrupt
+	 * handler here, and thus we have to fear no interference of other
+	 * activity.
+	 */
+
+	do_print = !handler && print_unex && !initialising;
+
+	inr = result();
+	if (do_print)
+		print_result("unexpected interrupt", inr);
+	if (inr == 0) {
+		int max_sensei = 4;
+		do {
+			output_byte(FD_SENSEI);
+			inr = result();
+			if (do_print)
+				print_result("sensei", inr);
+			max_sensei--;
+		} while ((ST0 & 0x83) != UNIT(current_drive) && inr == 2
+			 && max_sensei);
+	}
+	if (!handler) {
+		FDCS->reset = 1;
+		return IRQ_NONE;
+	}
+	schedule_bh(handler);
+	is_alive("normal interrupt end");
+
+	/* FIXME! Was it really for us? */
+	return IRQ_HANDLED;
+}
+
+static void recalibrate_floppy(void)
+{
+	debugt("recalibrate floppy:");
+	do_floppy = recal_interrupt;
+	output_byte(FD_RECALIBRATE);
+	LAST_OUT(UNIT(current_drive));
+}
+
+/*
+ * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
+ */
+static void reset_interrupt(void)
+{
+	debugt("reset interrupt:");
+	result();		/* get the status ready for set_fdc */
+	if (FDCS->reset) {
+		printk("reset set in interrupt, calling %p\n", cont->error);
+		cont->error();	/* a reset just after a reset. BAD! */
+	}
+	cont->redo();
+}
+
+/*
+ * reset is done by pulling bit 2 of DOR low for a while (old FDCs),
+ * or by setting the self clearing bit 7 of STATUS (newer FDCs)
+ */
+static void reset_fdc(void)
+{
+	unsigned long flags;
+
+	do_floppy = reset_interrupt;
+	FDCS->reset = 0;
+	reset_fdc_info(0);
+
+	/* Pseudo-DMA may intercept 'reset finished' interrupt.  */
+	/* Irrelevant for systems with true DMA (i386).          */
+
+	flags = claim_dma_lock();
+	fd_disable_dma();
+	release_dma_lock(flags);
+
+	if (FDCS->version >= FDC_82072A)
+		fd_outb(0x80 | (FDCS->dtr & 3), FD_STATUS);
+	else {
+		fd_outb(FDCS->dor & ~0x04, FD_DOR);
+		udelay(FD_RESET_DELAY);
+		fd_outb(FDCS->dor, FD_DOR);
+	}
+}
+
+static void show_floppy(void)
+{
+	int i;
+
+	printk("\n");
+	printk("floppy driver state\n");
+	printk("-------------------\n");
+	printk("now=%lu last interrupt=%lu diff=%lu last called handler=%p\n",
+	       jiffies, interruptjiffies, jiffies - interruptjiffies,
+	       lasthandler);
+
+#ifdef FLOPPY_SANITY_CHECK
+	printk("timeout_message=%s\n", timeout_message);
+	printk("last output bytes:\n");
+	for (i = 0; i < OLOGSIZE; i++)
+		printk("%2x %2x %lu\n",
+		       output_log[(i + output_log_pos) % OLOGSIZE].data,
+		       output_log[(i + output_log_pos) % OLOGSIZE].status,
+		       output_log[(i + output_log_pos) % OLOGSIZE].jiffies);
+	printk("last result at %lu\n", resultjiffies);
+	printk("last redo_fd_request at %lu\n", lastredo);
+	for (i = 0; i < resultsize; i++) {
+		printk("%2x ", reply_buffer[i]);
+	}
+	printk("\n");
+#endif
+
+	printk("status=%x\n", fd_inb(FD_STATUS));
+	printk("fdc_busy=%lu\n", fdc_busy);
+	if (do_floppy)
+		printk("do_floppy=%p\n", do_floppy);
+	if (floppy_work.pending)
+		printk("floppy_work.func=%p\n", floppy_work.func);
+	if (timer_pending(&fd_timer))
+		printk("fd_timer.function=%p\n", fd_timer.function);
+	if (timer_pending(&fd_timeout)) {
+		printk("timer_function=%p\n", fd_timeout.function);
+		printk("expires=%lu\n", fd_timeout.expires - jiffies);
+		printk("now=%lu\n", jiffies);
+	}
+	printk("cont=%p\n", cont);
+	printk("current_req=%p\n", current_req);
+	printk("command_status=%d\n", command_status);
+	printk("\n");
+}
+
+static void floppy_shutdown(unsigned long data)
+{
+	unsigned long flags;
+
+	if (!initialising)
+		show_floppy();
+	cancel_activity();
+
+	floppy_enable_hlt();
+
+	flags = claim_dma_lock();
+	fd_disable_dma();
+	release_dma_lock(flags);
+
+	/* avoid dma going to a random drive after shutdown */
+
+	if (!initialising)
+		DPRINT("floppy timeout called\n");
+	FDCS->reset = 1;
+	if (cont) {
+		cont->done(0);
+		cont->redo();	/* this will recall reset when needed */
+	} else {
+		printk("no cont in shutdown!\n");
+		process_fd_request();
+	}
+	is_alive("floppy shutdown");
+}
+
+/*typedef void (*timeout_fn)(unsigned long);*/
+
+/* start motor, check media-changed condition and write protection */
+static int start_motor(void (*function) (void))
+{
+	int mask, data;
+
+	mask = 0xfc;
+	data = UNIT(current_drive);
+	if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
+		if (!(FDCS->dor & (0x10 << UNIT(current_drive)))) {
+			set_debugt();
+			/* no read since this drive is running */
+			DRS->first_read_date = 0;
+			/* note motor start time if motor is not yet running */
+			DRS->spinup_date = jiffies;
+			data |= (0x10 << UNIT(current_drive));
+		}
+	} else if (FDCS->dor & (0x10 << UNIT(current_drive)))
+		mask &= ~(0x10 << UNIT(current_drive));
+
+	/* starts motor and selects floppy */
+	del_timer(motor_off_timer + current_drive);
+	set_dor(fdc, mask, data);
+
+	/* wait_for_completion also schedules reset if needed. */
+	return (fd_wait_for_completion(DRS->select_date + DP->select_delay,
+				       (timeout_fn) function));
+}
+
+static void floppy_ready(void)
+{
+	CHECK_RESET;
+	if (start_motor(floppy_ready))
+		return;
+	if (fdc_dtr())
+		return;
+
+#ifdef DCL_DEBUG
+	if (DP->flags & FD_DEBUG) {
+		DPRINT("calling disk change from floppy_ready\n");
+	}
+#endif
+	if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
+	    disk_change(current_drive) && !DP->select_delay)
+		twaddle();	/* this clears the dcl on certain drive/controller
+				 * combinations */
+
+#ifdef fd_chose_dma_mode
+	if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) {
+		unsigned long flags = claim_dma_lock();
+		fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length);
+		release_dma_lock(flags);
+	}
+#endif
+
+	if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) {
+		perpendicular_mode();
+		fdc_specify();	/* must be done here because of hut, hlt ... */
+		seek_floppy();
+	} else {
+		if ((raw_cmd->flags & FD_RAW_READ) ||
+		    (raw_cmd->flags & FD_RAW_WRITE))
+			fdc_specify();
+		setup_rw_floppy();
+	}
+}
+
+static void floppy_start(void)
+{
+	reschedule_timeout(current_reqD, "floppy start", 0);
+
+	scandrives();
+#ifdef DCL_DEBUG
+	if (DP->flags & FD_DEBUG) {
+		DPRINT("setting NEWCHANGE in floppy_start\n");
+	}
+#endif
+	SETF(FD_DISK_NEWCHANGE);
+	floppy_ready();
+}
+
+/*
+ * ========================================================================
+ * here ends the bottom half. Exported routines are:
+ * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
+ * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
+ * Initialization also uses output_byte, result, set_dor, floppy_interrupt
+ * and set_dor.
+ * ========================================================================
+ */
+/*
+ * General purpose continuations.
+ * ==============================
+ */
+
+static void do_wakeup(void)
+{
+	reschedule_timeout(MAXTIMEOUT, "do wakeup", 0);
+	cont = NULL;
+	command_status += 2;
+	wake_up(&command_done);
+}
+
+static struct cont_t wakeup_cont = {
+	.interrupt	= empty,
+	.redo		= do_wakeup,
+	.error		= empty,
+	.done		= (done_f) empty
+};
+
+static struct cont_t intr_cont = {
+	.interrupt	= empty,
+	.redo		= process_fd_request,
+	.error		= empty,
+	.done		= (done_f) empty
+};
+
+static int wait_til_done(void (*handler) (void), int interruptible)
+{
+	int ret;
+
+	schedule_bh(handler);
+
+	if (command_status < 2 && NO_SIGNAL) {
+		DECLARE_WAITQUEUE(wait, current);
+
+		add_wait_queue(&command_done, &wait);
+		for (;;) {
+			set_current_state(interruptible ?
+					  TASK_INTERRUPTIBLE :
+					  TASK_UNINTERRUPTIBLE);
+
+			if (command_status >= 2 || !NO_SIGNAL)
+				break;
+
+			is_alive("wait_til_done");
+
+			schedule();
+		}
+
+		set_current_state(TASK_RUNNING);
+		remove_wait_queue(&command_done, &wait);
+	}
+
+	if (command_status < 2) {
+		cancel_activity();
+		cont = &intr_cont;
+		reset_fdc();
+		return -EINTR;
+	}
+
+	if (FDCS->reset)
+		command_status = FD_COMMAND_ERROR;
+	if (command_status == FD_COMMAND_OKAY)
+		ret = 0;
+	else
+		ret = -EIO;
+	command_status = FD_COMMAND_NONE;
+	return ret;
+}
+
+static void generic_done(int result)
+{
+	command_status = result;
+	cont = &wakeup_cont;
+}
+
+static void generic_success(void)
+{
+	cont->done(1);
+}
+
+static void generic_failure(void)
+{
+	cont->done(0);
+}
+
+static void success_and_wakeup(void)
+{
+	generic_success();
+	cont->redo();
+}
+
+/*
+ * formatting and rw support.
+ * ==========================
+ */
+
+static int next_valid_format(void)
+{
+	int probed_format;
+
+	probed_format = DRS->probed_format;
+	while (1) {
+		if (probed_format >= 8 || !DP->autodetect[probed_format]) {
+			DRS->probed_format = 0;
+			return 1;
+		}
+		if (floppy_type[DP->autodetect[probed_format]].sect) {
+			DRS->probed_format = probed_format;
+			return 0;
+		}
+		probed_format++;
+	}
+}
+
+static void bad_flp_intr(void)
+{
+	int err_count;
+
+	if (probing) {
+		DRS->probed_format++;
+		if (!next_valid_format())
+			return;
+	}
+	err_count = ++(*errors);
+	INFBOUND(DRWE->badness, err_count);
+	if (err_count > DP->max_errors.abort)
+		cont->done(0);
+	if (err_count > DP->max_errors.reset)
+		FDCS->reset = 1;
+	else if (err_count > DP->max_errors.recal)
+		DRS->track = NEED_2_RECAL;
+}
+
+static void set_floppy(int drive)
+{
+	int type = ITYPE(UDRS->fd_device);
+	if (type)
+		_floppy = floppy_type + type;
+	else
+		_floppy = current_type[drive];
+}
+
+/*
+ * formatting support.
+ * ===================
+ */
+static void format_interrupt(void)
+{
+	switch (interpret_errors()) {
+	case 1:
+		cont->error();
+	case 2:
+		break;
+	case 0:
+		cont->done(1);
+	}
+	cont->redo();
+}
+
+#define CODE2SIZE (ssize = ((1 << SIZECODE) + 3) >> 2)
+#define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80) >>1))
+#define CT(x) ((x) | 0xc0)
+static void setup_format_params(int track)
+{
+	struct fparm {
+		unsigned char track, head, sect, size;
+	} *here = (struct fparm *)floppy_track_buffer;
+	int il, n;
+	int count, head_shift, track_shift;
+
+	raw_cmd = &default_raw_cmd;
+	raw_cmd->track = track;
+
+	raw_cmd->flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
+	    FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK;
+	raw_cmd->rate = _floppy->rate & 0x43;
+	raw_cmd->cmd_count = NR_F;
+	COMMAND = FM_MODE(_floppy, FD_FORMAT);
+	DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
+	F_SIZECODE = FD_SIZECODE(_floppy);
+	F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE;
+	F_GAP = _floppy->fmt_gap;
+	F_FILL = FD_FILL_BYTE;
+
+	raw_cmd->kernel_data = floppy_track_buffer;
+	raw_cmd->length = 4 * F_SECT_PER_TRACK;
+
+	/* allow for about 30ms for data transport per track */
+	head_shift = (F_SECT_PER_TRACK + 5) / 6;
+
+	/* a ``cylinder'' is two tracks plus a little stepping time */
+	track_shift = 2 * head_shift + 3;
+
+	/* position of logical sector 1 on this track */
+	n = (track_shift * format_req.track + head_shift * format_req.head)
+	    % F_SECT_PER_TRACK;
+
+	/* determine interleave */
+	il = 1;
+	if (_floppy->fmt_gap < 0x22)
+		il++;
+
+	/* initialize field */
+	for (count = 0; count < F_SECT_PER_TRACK; ++count) {
+		here[count].track = format_req.track;
+		here[count].head = format_req.head;
+		here[count].sect = 0;
+		here[count].size = F_SIZECODE;
+	}
+	/* place logical sectors */
+	for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
+		here[n].sect = count;
+		n = (n + il) % F_SECT_PER_TRACK;
+		if (here[n].sect) {	/* sector busy, find next free sector */
+			++n;
+			if (n >= F_SECT_PER_TRACK) {
+				n -= F_SECT_PER_TRACK;
+				while (here[n].sect)
+					++n;
+			}
+		}
+	}
+	if (_floppy->stretch & FD_ZEROBASED) {
+		for (count = 0; count < F_SECT_PER_TRACK; count++)
+			here[count].sect--;
+	}
+}
+
+static void redo_format(void)
+{
+	buffer_track = -1;
+	setup_format_params(format_req.track << STRETCH(_floppy));
+	floppy_start();
+	debugt("queue format request");
+}
+
+static struct cont_t format_cont = {
+	.interrupt	= format_interrupt,
+	.redo		= redo_format,
+	.error		= bad_flp_intr,
+	.done		= generic_done
+};
+
+static int do_format(int drive, struct format_descr *tmp_format_req)
+{
+	int ret;
+
+	LOCK_FDC(drive, 1);
+	set_floppy(drive);
+	if (!_floppy ||
+	    _floppy->track > DP->tracks ||
+	    tmp_format_req->track >= _floppy->track ||
+	    tmp_format_req->head >= _floppy->head ||
+	    (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
+	    !_floppy->fmt_gap) {
+		process_fd_request();
+		return -EINVAL;
+	}
+	format_req = *tmp_format_req;
+	format_errors = 0;
+	cont = &format_cont;
+	errors = &format_errors;
+	IWAIT(redo_format);
+	process_fd_request();
+	return ret;
+}
+
+/*
+ * Buffer read/write and support
+ * =============================
+ */
+
+static void floppy_end_request(struct request *req, int uptodate)
+{
+	unsigned int nr_sectors = current_count_sectors;
+
+	/* current_count_sectors can be zero if transfer failed */
+	if (!uptodate)
+		nr_sectors = req->current_nr_sectors;
+	if (end_that_request_first(req, uptodate, nr_sectors))
+		return;
+	add_disk_randomness(req->rq_disk);
+	floppy_off((long)req->rq_disk->private_data);
+	blkdev_dequeue_request(req);
+	end_that_request_last(req);
+
+	/* We're done with the request */
+	current_req = NULL;
+}
+
+/* new request_done. Can handle physical sectors which are smaller than a
+ * logical buffer */
+static void request_done(int uptodate)
+{
+	struct request_queue *q = floppy_queue;
+	struct request *req = current_req;
+	unsigned long flags;
+	int block;
+
+	probing = 0;
+	reschedule_timeout(MAXTIMEOUT, "request done %d", uptodate);
+
+	if (!req) {
+		printk("floppy.c: no request in request_done\n");
+		return;
+	}
+
+	if (uptodate) {
+		/* maintain values for invalidation on geometry
+		 * change */
+		block = current_count_sectors + req->sector;
+		INFBOUND(DRS->maxblock, block);
+		if (block > _floppy->sect)
+			DRS->maxtrack = 1;
+
+		/* unlock chained buffers */
+		spin_lock_irqsave(q->queue_lock, flags);
+		floppy_end_request(req, 1);
+		spin_unlock_irqrestore(q->queue_lock, flags);
+	} else {
+		if (rq_data_dir(req) == WRITE) {
+			/* record write error information */
+			DRWE->write_errors++;
+			if (DRWE->write_errors == 1) {
+				DRWE->first_error_sector = req->sector;
+				DRWE->first_error_generation = DRS->generation;
+			}
+			DRWE->last_error_sector = req->sector;
+			DRWE->last_error_generation = DRS->generation;
+		}
+		spin_lock_irqsave(q->queue_lock, flags);
+		floppy_end_request(req, 0);
+		spin_unlock_irqrestore(q->queue_lock, flags);
+	}
+}
+
+/* Interrupt handler evaluating the result of the r/w operation */
+static void rw_interrupt(void)
+{
+	int nr_sectors, ssize, eoc, heads;
+
+	if (R_HEAD >= 2) {
+		/* some Toshiba floppy controllers occasionnally seem to
+		 * return bogus interrupts after read/write operations, which
+		 * can be recognized by a bad head number (>= 2) */
+		return;
+	}
+
+	if (!DRS->first_read_date)
+		DRS->first_read_date = jiffies;
+
+	nr_sectors = 0;
+	CODE2SIZE;
+
+	if (ST1 & ST1_EOC)
+		eoc = 1;
+	else
+		eoc = 0;
+
+	if (COMMAND & 0x80)
+		heads = 2;
+	else
+		heads = 1;
+
+	nr_sectors = (((R_TRACK - TRACK) * heads +
+		       R_HEAD - HEAD) * SECT_PER_TRACK +
+		      R_SECTOR - SECTOR + eoc) << SIZECODE >> 2;
+
+#ifdef FLOPPY_SANITY_CHECK
+	if (nr_sectors / ssize >
+	    (in_sector_offset + current_count_sectors + ssize - 1) / ssize) {
+		DPRINT("long rw: %x instead of %lx\n",
+		       nr_sectors, current_count_sectors);
+		printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
+		printk("rh=%d h=%d\n", R_HEAD, HEAD);
+		printk("rt=%d t=%d\n", R_TRACK, TRACK);
+		printk("heads=%d eoc=%d\n", heads, eoc);
+		printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
+		       fsector_t, ssize);
+		printk("in_sector_offset=%d\n", in_sector_offset);
+	}
+#endif
+
+	nr_sectors -= in_sector_offset;
+	INFBOUND(nr_sectors, 0);
+	SUPBOUND(current_count_sectors, nr_sectors);
+
+	switch (interpret_errors()) {
+	case 2:
+		cont->redo();
+		return;
+	case 1:
+		if (!current_count_sectors) {
+			cont->error();
+			cont->redo();
+			return;
+		}
+		break;
+	case 0:
+		if (!current_count_sectors) {
+			cont->redo();
+			return;
+		}
+		current_type[current_drive] = _floppy;
+		floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
+		break;
+	}
+
+	if (probing) {
+		if (DP->flags & FTD_MSG)
+			DPRINT("Auto-detected floppy type %s in fd%d\n",
+			       _floppy->name, current_drive);
+		current_type[current_drive] = _floppy;
+		floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
+		probing = 0;
+	}
+
+	if (CT(COMMAND) != FD_READ ||
+	    raw_cmd->kernel_data == current_req->buffer) {
+		/* transfer directly from buffer */
+		cont->done(1);
+	} else if (CT(COMMAND) == FD_READ) {
+		buffer_track = raw_cmd->track;
+		buffer_drive = current_drive;
+		INFBOUND(buffer_max, nr_sectors + fsector_t);
+	}
+	cont->redo();
+}
+
+/* Compute maximal contiguous buffer size. */
+static int buffer_chain_size(void)
+{
+	struct bio *bio;
+	struct bio_vec *bv;
+	int size, i;
+	char *base;
+
+	base = bio_data(current_req->bio);
+	size = 0;
+
+	rq_for_each_bio(bio, current_req) {
+		bio_for_each_segment(bv, bio, i) {
+			if (page_address(bv->bv_page) + bv->bv_offset !=
+			    base + size)
+				break;
+
+			size += bv->bv_len;
+		}
+	}
+
+	return size >> 9;
+}
+
+/* Compute the maximal transfer size */
+static int transfer_size(int ssize, int max_sector, int max_size)
+{
+	SUPBOUND(max_sector, fsector_t + max_size);
+
+	/* alignment */
+	max_sector -= (max_sector % _floppy->sect) % ssize;
+
+	/* transfer size, beginning not aligned */
+	current_count_sectors = max_sector - fsector_t;
+
+	return max_sector;
+}
+
+/*
+ * Move data from/to the track buffer to/from the buffer cache.
+ */
+static void copy_buffer(int ssize, int max_sector, int max_sector_2)
+{
+	int remaining;		/* number of transferred 512-byte sectors */
+	struct bio_vec *bv;
+	struct bio *bio;
+	char *buffer, *dma_buffer;
+	int size, i;
+
+	max_sector = transfer_size(ssize,
+				   min(max_sector, max_sector_2),
+				   current_req->nr_sectors);
+
+	if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
+	    buffer_max > fsector_t + current_req->nr_sectors)
+		current_count_sectors = min_t(int, buffer_max - fsector_t,
+					      current_req->nr_sectors);
+
+	remaining = current_count_sectors << 9;
+#ifdef FLOPPY_SANITY_CHECK
+	if ((remaining >> 9) > current_req->nr_sectors &&
+	    CT(COMMAND) == FD_WRITE) {
+		DPRINT("in copy buffer\n");
+		printk("current_count_sectors=%ld\n", current_count_sectors);
+		printk("remaining=%d\n", remaining >> 9);
+		printk("current_req->nr_sectors=%ld\n",
+		       current_req->nr_sectors);
+		printk("current_req->current_nr_sectors=%u\n",
+		       current_req->current_nr_sectors);
+		printk("max_sector=%d\n", max_sector);
+		printk("ssize=%d\n", ssize);
+	}
+#endif
+
+	buffer_max = max(max_sector, buffer_max);
+
+	dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
+
+	size = current_req->current_nr_sectors << 9;
+
+	rq_for_each_bio(bio, current_req) {
+		bio_for_each_segment(bv, bio, i) {
+			if (!remaining)
+				break;
+
+			size = bv->bv_len;
+			SUPBOUND(size, remaining);
+
+			buffer = page_address(bv->bv_page) + bv->bv_offset;
+#ifdef FLOPPY_SANITY_CHECK
+			if (dma_buffer + size >
+			    floppy_track_buffer + (max_buffer_sectors << 10) ||
+			    dma_buffer < floppy_track_buffer) {
+				DPRINT("buffer overrun in copy buffer %d\n",
+				       (int)((floppy_track_buffer -
+					      dma_buffer) >> 9));
+				printk("fsector_t=%d buffer_min=%d\n",
+				       fsector_t, buffer_min);
+				printk("current_count_sectors=%ld\n",
+				       current_count_sectors);
+				if (CT(COMMAND) == FD_READ)
+					printk("read\n");
+				if (CT(COMMAND) == FD_WRITE)
+					printk("write\n");
+				break;
+			}
+			if (((unsigned long)buffer) % 512)
+				DPRINT("%p buffer not aligned\n", buffer);
+#endif
+			if (CT(COMMAND) == FD_READ)
+				memcpy(buffer, dma_buffer, size);
+			else
+				memcpy(dma_buffer, buffer, size);
+
+			remaining -= size;
+			dma_buffer += size;
+		}
+	}
+#ifdef FLOPPY_SANITY_CHECK
+	if (remaining) {
+		if (remaining > 0)
+			max_sector -= remaining >> 9;
+		DPRINT("weirdness: remaining %d\n", remaining >> 9);
+	}
+#endif
+}
+
+#if 0
+static inline int check_dma_crossing(char *start,
+				     unsigned long length, char *message)
+{
+	if (CROSS_64KB(start, length)) {
+		printk("DMA xfer crosses 64KB boundary in %s %p-%p\n",
+		       message, start, start + length);
+		return 1;
+	} else
+		return 0;
+}
+#endif
+
+/* work around a bug in pseudo DMA
+ * (on some FDCs) pseudo DMA does not stop when the CPU stops
+ * sending data.  Hence we need a different way to signal the
+ * transfer length:  We use SECT_PER_TRACK.  Unfortunately, this
+ * does not work with MT, hence we can only transfer one head at
+ * a time
+ */
+static void virtualdmabug_workaround(void)
+{
+	int hard_sectors, end_sector;
+
+	if (CT(COMMAND) == FD_WRITE) {
+		COMMAND &= ~0x80;	/* switch off multiple track mode */
+
+		hard_sectors = raw_cmd->length >> (7 + SIZECODE);
+		end_sector = SECTOR + hard_sectors - 1;
+#ifdef FLOPPY_SANITY_CHECK
+		if (end_sector > SECT_PER_TRACK) {
+			printk("too many sectors %d > %d\n",
+			       end_sector, SECT_PER_TRACK);
+			return;
+		}
+#endif
+		SECT_PER_TRACK = end_sector;	/* make sure SECT_PER_TRACK points
+						 * to end of transfer */
+	}
+}
+
+/*
+ * Formulate a read/write request.
+ * this routine decides where to load the data (directly to buffer, or to
+ * tmp floppy area), how much data to load (the size of the buffer, the whole
+ * track, or a single sector)
+ * All floppy_track_buffer handling goes in here. If we ever add track buffer
+ * allocation on the fly, it should be done here. No other part should need
+ * modification.
+ */
+
+static int make_raw_rw_request(void)
+{
+	int aligned_sector_t;
+	int max_sector, max_size, tracksize, ssize;
+
+	if (max_buffer_sectors == 0) {
+		printk("VFS: Block I/O scheduled on unopened device\n");
+		return 0;
+	}
+
+	set_fdc((long)current_req->rq_disk->private_data);
+
+	raw_cmd = &default_raw_cmd;
+	raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
+	    FD_RAW_NEED_SEEK;
+	raw_cmd->cmd_count = NR_RW;
+	if (rq_data_dir(current_req) == READ) {
+		raw_cmd->flags |= FD_RAW_READ;
+		COMMAND = FM_MODE(_floppy, FD_READ);
+	} else if (rq_data_dir(current_req) == WRITE) {
+		raw_cmd->flags |= FD_RAW_WRITE;
+		COMMAND = FM_MODE(_floppy, FD_WRITE);
+	} else {
+		DPRINT("make_raw_rw_request: unknown command\n");
+		return 0;
+	}
+
+	max_sector = _floppy->sect * _floppy->head;
+
+	TRACK = (int)current_req->sector / max_sector;
+	fsector_t = (int)current_req->sector % max_sector;
+	if (_floppy->track && TRACK >= _floppy->track) {
+		if (current_req->current_nr_sectors & 1) {
+			current_count_sectors = 1;
+			return 1;
+		} else
+			return 0;
+	}
+	HEAD = fsector_t / _floppy->sect;
+
+	if (((_floppy->stretch & (FD_SWAPSIDES | FD_ZEROBASED)) ||
+	     TESTF(FD_NEED_TWADDLE)) && fsector_t < _floppy->sect)
+		max_sector = _floppy->sect;
+
+	/* 2M disks have phantom sectors on the first track */
+	if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)) {
+		max_sector = 2 * _floppy->sect / 3;
+		if (fsector_t >= max_sector) {
+			current_count_sectors =
+			    min_t(int, _floppy->sect - fsector_t,
+				  current_req->nr_sectors);
+			return 1;
+		}
+		SIZECODE = 2;
+	} else
+		SIZECODE = FD_SIZECODE(_floppy);
+	raw_cmd->rate = _floppy->rate & 0x43;
+	if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2)
+		raw_cmd->rate = 1;
+
+	if (SIZECODE)
+		SIZECODE2 = 0xff;
+	else
+		SIZECODE2 = 0x80;
+	raw_cmd->track = TRACK << STRETCH(_floppy);
+	DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD);
+	GAP = _floppy->gap;
+	CODE2SIZE;
+	SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
+	SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
+	    ((_floppy->stretch & FD_ZEROBASED) ? 0 : 1);
+
+	/* tracksize describes the size which can be filled up with sectors
+	 * of size ssize.
+	 */
+	tracksize = _floppy->sect - _floppy->sect % ssize;
+	if (tracksize < _floppy->sect) {
+		SECT_PER_TRACK++;
+		if (tracksize <= fsector_t % _floppy->sect)
+			SECTOR--;
+
+		/* if we are beyond tracksize, fill up using smaller sectors */
+		while (tracksize <= fsector_t % _floppy->sect) {
+			while (tracksize + ssize > _floppy->sect) {
+				SIZECODE--;
+				ssize >>= 1;
+			}
+			SECTOR++;
+			SECT_PER_TRACK++;
+			tracksize += ssize;
+		}
+		max_sector = HEAD * _floppy->sect + tracksize;
+	} else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing) {
+		max_sector = _floppy->sect;
+	} else if (!HEAD && CT(COMMAND) == FD_WRITE) {
+		/* for virtual DMA bug workaround */
+		max_sector = _floppy->sect;
+	}
+
+	in_sector_offset = (fsector_t % _floppy->sect) % ssize;
+	aligned_sector_t = fsector_t - in_sector_offset;
+	max_size = current_req->nr_sectors;
+	if ((raw_cmd->track == buffer_track) &&
+	    (current_drive == buffer_drive) &&
+	    (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
+		/* data already in track buffer */
+		if (CT(COMMAND) == FD_READ) {
+			copy_buffer(1, max_sector, buffer_max);
+			return 1;
+		}
+	} else if (in_sector_offset || current_req->nr_sectors < ssize) {
+		if (CT(COMMAND) == FD_WRITE) {
+			if (fsector_t + current_req->nr_sectors > ssize &&
+			    fsector_t + current_req->nr_sectors < ssize + ssize)
+				max_size = ssize + ssize;
+			else
+				max_size = ssize;
+		}
+		raw_cmd->flags &= ~FD_RAW_WRITE;
+		raw_cmd->flags |= FD_RAW_READ;
+		COMMAND = FM_MODE(_floppy, FD_READ);
+	} else if ((unsigned long)current_req->buffer < MAX_DMA_ADDRESS) {
+		unsigned long dma_limit;
+		int direct, indirect;
+
+		indirect =
+		    transfer_size(ssize, max_sector,
+				  max_buffer_sectors * 2) - fsector_t;
+
+		/*
+		 * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
+		 * on a 64 bit machine!
+		 */
+		max_size = buffer_chain_size();
+		dma_limit =
+		    (MAX_DMA_ADDRESS -
+		     ((unsigned long)current_req->buffer)) >> 9;
+		if ((unsigned long)max_size > dma_limit) {
+			max_size = dma_limit;
+		}
+		/* 64 kb boundaries */
+		if (CROSS_64KB(current_req->buffer, max_size << 9))
+			max_size = (K_64 -
+				    ((unsigned long)current_req->buffer) %
+				    K_64) >> 9;
+		direct = transfer_size(ssize, max_sector, max_size) - fsector_t;
+		/*
+		 * We try to read tracks, but if we get too many errors, we
+		 * go back to reading just one sector at a time.
+		 *
+		 * This means we should be able to read a sector even if there
+		 * are other bad sectors on this track.
+		 */
+		if (!direct ||
+		    (indirect * 2 > direct * 3 &&
+		     *errors < DP->max_errors.read_track &&
+		     /*!TESTF(FD_NEED_TWADDLE) && */
+		     ((!probing
+		       || (DP->read_track & (1 << DRS->probed_format)))))) {
+			max_size = current_req->nr_sectors;
+		} else {
+			raw_cmd->kernel_data = current_req->buffer;
+			raw_cmd->length = current_count_sectors << 9;
+			if (raw_cmd->length == 0) {
+				DPRINT
+				    ("zero dma transfer attempted from make_raw_request\n");
+				DPRINT("indirect=%d direct=%d fsector_t=%d",
+				       indirect, direct, fsector_t);
+				return 0;
+			}
+/*			check_dma_crossing(raw_cmd->kernel_data, 
+					   raw_cmd->length, 
+					   "end of make_raw_request [1]");*/
+
+			virtualdmabug_workaround();
+			return 2;
+		}
+	}
+
+	if (CT(COMMAND) == FD_READ)
+		max_size = max_sector;	/* unbounded */
+
+	/* claim buffer track if needed */
+	if (buffer_track != raw_cmd->track ||	/* bad track */
+	    buffer_drive != current_drive ||	/* bad drive */
+	    fsector_t > buffer_max ||
+	    fsector_t < buffer_min ||
+	    ((CT(COMMAND) == FD_READ ||
+	      (!in_sector_offset && current_req->nr_sectors >= ssize)) &&
+	     max_sector > 2 * max_buffer_sectors + buffer_min &&
+	     max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)
+	    /* not enough space */
+	    ) {
+		buffer_track = -1;
+		buffer_drive = current_drive;
+		buffer_max = buffer_min = aligned_sector_t;
+	}
+	raw_cmd->kernel_data = floppy_track_buffer +
+	    ((aligned_sector_t - buffer_min) << 9);
+
+	if (CT(COMMAND) == FD_WRITE) {
+		/* copy write buffer to track buffer.
+		 * if we get here, we know that the write
+		 * is either aligned or the data already in the buffer
+		 * (buffer will be overwritten) */
+#ifdef FLOPPY_SANITY_CHECK
+		if (in_sector_offset && buffer_track == -1)
+			DPRINT("internal error offset !=0 on write\n");
+#endif
+		buffer_track = raw_cmd->track;
+		buffer_drive = current_drive;
+		copy_buffer(ssize, max_sector,
+			    2 * max_buffer_sectors + buffer_min);
+	} else
+		transfer_size(ssize, max_sector,
+			      2 * max_buffer_sectors + buffer_min -
+			      aligned_sector_t);
+
+	/* round up current_count_sectors to get dma xfer size */
+	raw_cmd->length = in_sector_offset + current_count_sectors;
+	raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
+	raw_cmd->length <<= 9;
+#ifdef FLOPPY_SANITY_CHECK
+	/*check_dma_crossing(raw_cmd->kernel_data, raw_cmd->length, 
+	   "end of make_raw_request"); */
+	if ((raw_cmd->length < current_count_sectors << 9) ||
+	    (raw_cmd->kernel_data != current_req->buffer &&
+	     CT(COMMAND) == FD_WRITE &&
+	     (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
+	      aligned_sector_t < buffer_min)) ||
+	    raw_cmd->length % (128 << SIZECODE) ||
+	    raw_cmd->length <= 0 || current_count_sectors <= 0) {
+		DPRINT("fractionary current count b=%lx s=%lx\n",
+		       raw_cmd->length, current_count_sectors);
+		if (raw_cmd->kernel_data != current_req->buffer)
+			printk("addr=%d, length=%ld\n",
+			       (int)((raw_cmd->kernel_data -
+				      floppy_track_buffer) >> 9),
+			       current_count_sectors);
+		printk("st=%d ast=%d mse=%d msi=%d\n",
+		       fsector_t, aligned_sector_t, max_sector, max_size);
+		printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
+		printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
+		       COMMAND, SECTOR, HEAD, TRACK);
+		printk("buffer drive=%d\n", buffer_drive);
+		printk("buffer track=%d\n", buffer_track);
+		printk("buffer_min=%d\n", buffer_min);
+		printk("buffer_max=%d\n", buffer_max);
+		return 0;
+	}
+
+	if (raw_cmd->kernel_data != current_req->buffer) {
+		if (raw_cmd->kernel_data < floppy_track_buffer ||
+		    current_count_sectors < 0 ||
+		    raw_cmd->length < 0 ||
+		    raw_cmd->kernel_data + raw_cmd->length >
+		    floppy_track_buffer + (max_buffer_sectors << 10)) {
+			DPRINT("buffer overrun in schedule dma\n");
+			printk("fsector_t=%d buffer_min=%d current_count=%ld\n",
+			       fsector_t, buffer_min, raw_cmd->length >> 9);
+			printk("current_count_sectors=%ld\n",
+			       current_count_sectors);
+			if (CT(COMMAND) == FD_READ)
+				printk("read\n");
+			if (CT(COMMAND) == FD_WRITE)
+				printk("write\n");
+			return 0;
+		}
+	} else if (raw_cmd->length > current_req->nr_sectors << 9 ||
+		   current_count_sectors > current_req->nr_sectors) {
+		DPRINT("buffer overrun in direct transfer\n");
+		return 0;
+	} else if (raw_cmd->length < current_count_sectors << 9) {
+		DPRINT("more sectors than bytes\n");
+		printk("bytes=%ld\n", raw_cmd->length >> 9);
+		printk("sectors=%ld\n", current_count_sectors);
+	}
+	if (raw_cmd->length == 0) {
+		DPRINT("zero dma transfer attempted from make_raw_request\n");
+		return 0;
+	}
+#endif
+
+	virtualdmabug_workaround();
+	return 2;
+}
+
+static void redo_fd_request(void)
+{
+#define REPEAT {request_done(0); continue; }
+	int drive;
+	int tmp;
+
+	lastredo = jiffies;
+	if (current_drive < N_DRIVE)
+		floppy_off(current_drive);
+
+	for (;;) {
+		if (!current_req) {
+			struct request *req;
+
+			spin_lock_irq(floppy_queue->queue_lock);
+			req = elv_next_request(floppy_queue);
+			spin_unlock_irq(floppy_queue->queue_lock);
+			if (!req) {
+				do_floppy = NULL;
+				unlock_fdc();
+				return;
+			}
+			current_req = req;
+		}
+		drive = (long)current_req->rq_disk->private_data;
+		set_fdc(drive);
+		reschedule_timeout(current_reqD, "redo fd request", 0);
+
+		set_floppy(drive);
+		raw_cmd = &default_raw_cmd;
+		raw_cmd->flags = 0;
+		if (start_motor(redo_fd_request))
+			return;
+		disk_change(current_drive);
+		if (test_bit(current_drive, &fake_change) ||
+		    TESTF(FD_DISK_CHANGED)) {
+			DPRINT("disk absent or changed during operation\n");
+			REPEAT;
+		}
+		if (!_floppy) {	/* Autodetection */
+			if (!probing) {
+				DRS->probed_format = 0;
+				if (next_valid_format()) {
+					DPRINT("no autodetectable formats\n");
+					_floppy = NULL;
+					REPEAT;
+				}
+			}
+			probing = 1;
+			_floppy =
+			    floppy_type + DP->autodetect[DRS->probed_format];
+		} else
+			probing = 0;
+		errors = &(current_req->errors);
+		tmp = make_raw_rw_request();
+		if (tmp < 2) {
+			request_done(tmp);
+			continue;
+		}
+
+		if (TESTF(FD_NEED_TWADDLE))
+			twaddle();
+		schedule_bh(floppy_start);
+		debugt("queue fd request");
+		return;
+	}
+#undef REPEAT
+}
+
+static struct cont_t rw_cont = {
+	.interrupt	= rw_interrupt,
+	.redo		= redo_fd_request,
+	.error		= bad_flp_intr,
+	.done		= request_done
+};
+
+static void process_fd_request(void)
+{
+	cont = &rw_cont;
+	schedule_bh(redo_fd_request);
+}
+
+static void do_fd_request(request_queue_t * q)
+{
+	if (max_buffer_sectors == 0) {
+		printk("VFS: do_fd_request called on non-open device\n");
+		return;
+	}
+
+	if (usage_count == 0) {
+		printk("warning: usage count=0, current_req=%p exiting\n",
+		       current_req);
+		printk("sect=%ld flags=%lx\n", (long)current_req->sector,
+		       current_req->flags);
+		return;
+	}
+	if (test_bit(0, &fdc_busy)) {
+		/* fdc busy, this new request will be treated when the
+		   current one is done */
+		is_alive("do fd request, old request running");
+		return;
+	}
+	lock_fdc(MAXTIMEOUT, 0);
+	process_fd_request();
+	is_alive("do fd request");
+}
+
+static struct cont_t poll_cont = {
+	.interrupt	= success_and_wakeup,
+	.redo		= floppy_ready,
+	.error		= generic_failure,
+	.done		= generic_done
+};
+
+static int poll_drive(int interruptible, int flag)
+{
+	int ret;
+	/* no auto-sense, just clear dcl */
+	raw_cmd = &default_raw_cmd;
+	raw_cmd->flags = flag;
+	raw_cmd->track = 0;
+	raw_cmd->cmd_count = 0;
+	cont = &poll_cont;
+#ifdef DCL_DEBUG
+	if (DP->flags & FD_DEBUG) {
+		DPRINT("setting NEWCHANGE in poll_drive\n");
+	}
+#endif
+	SETF(FD_DISK_NEWCHANGE);
+	WAIT(floppy_ready);
+	return ret;
+}
+
+/*
+ * User triggered reset
+ * ====================
+ */
+
+static void reset_intr(void)
+{
+	printk("weird, reset interrupt called\n");
+}
+
+static struct cont_t reset_cont = {
+	.interrupt	= reset_intr,
+	.redo		= success_and_wakeup,
+	.error		= generic_failure,
+	.done		= generic_done
+};
+
+static int user_reset_fdc(int drive, int arg, int interruptible)
+{
+	int ret;
+
+	ret = 0;
+	LOCK_FDC(drive, interruptible);
+	if (arg == FD_RESET_ALWAYS)
+		FDCS->reset = 1;
+	if (FDCS->reset) {
+		cont = &reset_cont;
+		WAIT(reset_fdc);
+	}
+	process_fd_request();
+	return ret;
+}
+
+/*
+ * Misc Ioctl's and support
+ * ========================
+ */
+static inline int fd_copyout(void __user *param, const void *address,
+			     unsigned long size)
+{
+	return copy_to_user(param, address, size) ? -EFAULT : 0;
+}
+
+static inline int fd_copyin(void __user *param, void *address, unsigned long size)
+{
+	return copy_from_user(address, param, size) ? -EFAULT : 0;
+}
+
+#define _COPYOUT(x) (copy_to_user((void __user *)param, &(x), sizeof(x)) ? -EFAULT : 0)
+#define _COPYIN(x) (copy_from_user(&(x), (void __user *)param, sizeof(x)) ? -EFAULT : 0)
+
+#define COPYOUT(x) ECALL(_COPYOUT(x))
+#define COPYIN(x) ECALL(_COPYIN(x))
+
+static inline const char *drive_name(int type, int drive)
+{
+	struct floppy_struct *floppy;
+
+	if (type)
+		floppy = floppy_type + type;
+	else {
+		if (UDP->native_format)
+			floppy = floppy_type + UDP->native_format;
+		else
+			return "(null)";
+	}
+	if (floppy->name)
+		return floppy->name;
+	else
+		return "(null)";
+}
+
+/* raw commands */
+static void raw_cmd_done(int flag)
+{
+	int i;
+
+	if (!flag) {
+		raw_cmd->flags |= FD_RAW_FAILURE;
+		raw_cmd->flags |= FD_RAW_HARDFAILURE;
+	} else {
+		raw_cmd->reply_count = inr;
+		if (raw_cmd->reply_count > MAX_REPLIES)
+			raw_cmd->reply_count = 0;
+		for (i = 0; i < raw_cmd->reply_count; i++)
+			raw_cmd->reply[i] = reply_buffer[i];
+
+		if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
+			unsigned long flags;
+			flags = claim_dma_lock();
+			raw_cmd->length = fd_get_dma_residue();
+			release_dma_lock(flags);
+		}
+
+		if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
+		    (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
+			raw_cmd->flags |= FD_RAW_FAILURE;
+
+		if (disk_change(current_drive))
+			raw_cmd->flags |= FD_RAW_DISK_CHANGE;
+		else
+			raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
+		if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
+			motor_off_callback(current_drive);
+
+		if (raw_cmd->next &&
+		    (!(raw_cmd->flags & FD_RAW_FAILURE) ||
+		     !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
+		    ((raw_cmd->flags & FD_RAW_FAILURE) ||
+		     !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
+			raw_cmd = raw_cmd->next;
+			return;
+		}
+	}
+	generic_done(flag);
+}
+
+static struct cont_t raw_cmd_cont = {
+	.interrupt	= success_and_wakeup,
+	.redo		= floppy_start,
+	.error		= generic_failure,
+	.done		= raw_cmd_done
+};
+
+static inline int raw_cmd_copyout(int cmd, char __user *param,
+				  struct floppy_raw_cmd *ptr)
+{
+	int ret;
+
+	while (ptr) {
+		COPYOUT(*ptr);
+		param += sizeof(struct floppy_raw_cmd);
+		if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
+			if (ptr->length >= 0
+			    && ptr->length <= ptr->buffer_length)
+				ECALL(fd_copyout
+				      (ptr->data, ptr->kernel_data,
+				       ptr->buffer_length - ptr->length));
+		}
+		ptr = ptr->next;
+	}
+	return 0;
+}
+
+static void raw_cmd_free(struct floppy_raw_cmd **ptr)
+{
+	struct floppy_raw_cmd *next, *this;
+
+	this = *ptr;
+	*ptr = NULL;
+	while (this) {
+		if (this->buffer_length) {
+			fd_dma_mem_free((unsigned long)this->kernel_data,
+					this->buffer_length);
+			this->buffer_length = 0;
+		}
+		next = this->next;
+		kfree(this);
+		this = next;
+	}
+}
+
+static inline int raw_cmd_copyin(int cmd, char __user *param,
+				 struct floppy_raw_cmd **rcmd)
+{
+	struct floppy_raw_cmd *ptr;
+	int ret;
+	int i;
+
+	*rcmd = NULL;
+	while (1) {
+		ptr = (struct floppy_raw_cmd *)
+		    kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
+		if (!ptr)
+			return -ENOMEM;
+		*rcmd = ptr;
+		COPYIN(*ptr);
+		ptr->next = NULL;
+		ptr->buffer_length = 0;
+		param += sizeof(struct floppy_raw_cmd);
+		if (ptr->cmd_count > 33)
+			/* the command may now also take up the space
+			 * initially intended for the reply & the
+			 * reply count. Needed for long 82078 commands
+			 * such as RESTORE, which takes ... 17 command
+			 * bytes. Murphy's law #137: When you reserve
+			 * 16 bytes for a structure, you'll one day
+			 * discover that you really need 17...
+			 */
+			return -EINVAL;
+
+		for (i = 0; i < 16; i++)
+			ptr->reply[i] = 0;
+		ptr->resultcode = 0;
+		ptr->kernel_data = NULL;
+
+		if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
+			if (ptr->length <= 0)
+				return -EINVAL;
+			ptr->kernel_data =
+			    (char *)fd_dma_mem_alloc(ptr->length);
+			fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
+			if (!ptr->kernel_data)
+				return -ENOMEM;
+			ptr->buffer_length = ptr->length;
+		}
+		if (ptr->flags & FD_RAW_WRITE)
+			ECALL(fd_copyin(ptr->data, ptr->kernel_data,
+					ptr->length));
+		rcmd = &(ptr->next);
+		if (!(ptr->flags & FD_RAW_MORE))
+			return 0;
+		ptr->rate &= 0x43;
+	}
+}
+
+static int raw_cmd_ioctl(int cmd, void __user *param)
+{
+	int drive, ret, ret2;
+	struct floppy_raw_cmd *my_raw_cmd;
+
+	if (FDCS->rawcmd <= 1)
+		FDCS->rawcmd = 1;
+	for (drive = 0; drive < N_DRIVE; drive++) {
+		if (FDC(drive) != fdc)
+			continue;
+		if (drive == current_drive) {
+			if (UDRS->fd_ref > 1) {
+				FDCS->rawcmd = 2;
+				break;
+			}
+		} else if (UDRS->fd_ref) {
+			FDCS->rawcmd = 2;
+			break;
+		}
+	}
+
+	if (FDCS->reset)
+		return -EIO;
+
+	ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
+	if (ret) {
+		raw_cmd_free(&my_raw_cmd);
+		return ret;
+	}
+
+	raw_cmd = my_raw_cmd;
+	cont = &raw_cmd_cont;
+	ret = wait_til_done(floppy_start, 1);
+#ifdef DCL_DEBUG
+	if (DP->flags & FD_DEBUG) {
+		DPRINT("calling disk change from raw_cmd ioctl\n");
+	}
+#endif
+
+	if (ret != -EINTR && FDCS->reset)
+		ret = -EIO;
+
+	DRS->track = NO_TRACK;
+
+	ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
+	if (!ret)
+		ret = ret2;
+	raw_cmd_free(&my_raw_cmd);
+	return ret;
+}
+
+static int invalidate_drive(struct block_device *bdev)
+{
+	/* invalidate the buffer track to force a reread */
+	set_bit((long)bdev->bd_disk->private_data, &fake_change);
+	process_fd_request();
+	check_disk_change(bdev);
+	return 0;
+}
+
+static inline int set_geometry(unsigned int cmd, struct floppy_struct *g,
+			       int drive, int type, struct block_device *bdev)
+{
+	int cnt;
+
+	/* sanity checking for parameters. */
+	if (g->sect <= 0 ||
+	    g->head <= 0 ||
+	    g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
+	    /* check if reserved bits are set */
+	    (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_ZEROBASED)) != 0)
+		return -EINVAL;
+	if (type) {
+		if (!capable(CAP_SYS_ADMIN))
+			return -EPERM;
+		down(&open_lock);
+		LOCK_FDC(drive, 1);
+		floppy_type[type] = *g;
+		floppy_type[type].name = "user format";
+		for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
+			floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] =
+			    floppy_type[type].size + 1;
+		process_fd_request();
+		for (cnt = 0; cnt < N_DRIVE; cnt++) {
+			struct block_device *bdev = opened_bdev[cnt];
+			if (!bdev || ITYPE(drive_state[cnt].fd_device) != type)
+				continue;
+			__invalidate_device(bdev, 0);
+		}
+		up(&open_lock);
+	} else {
+		int oldStretch;
+		LOCK_FDC(drive, 1);
+		if (cmd != FDDEFPRM)
+			/* notice a disk change immediately, else
+			 * we lose our settings immediately*/
+			CALL(poll_drive(1, FD_RAW_NEED_DISK));
+		oldStretch = g->stretch;
+		user_params[drive] = *g;
+		if (buffer_drive == drive)
+			SUPBOUND(buffer_max, user_params[drive].sect);
+		current_type[drive] = &user_params[drive];
+		floppy_sizes[drive] = user_params[drive].size;
+		if (cmd == FDDEFPRM)
+			DRS->keep_data = -1;
+		else
+			DRS->keep_data = 1;
+		/* invalidation. Invalidate only when needed, i.e.
+		 * when there are already sectors in the buffer cache
+		 * whose number will change. This is useful, because
+		 * mtools often changes the geometry of the disk after
+		 * looking at the boot block */
+		if (DRS->maxblock > user_params[drive].sect ||
+		    DRS->maxtrack ||
+		    ((user_params[drive].sect ^ oldStretch) &
+		     (FD_SWAPSIDES | FD_ZEROBASED)))
+			invalidate_drive(bdev);
+		else
+			process_fd_request();
+	}
+	return 0;
+}
+
+/* handle obsolete ioctl's */
+static int ioctl_table[] = {
+	FDCLRPRM,
+	FDSETPRM,
+	FDDEFPRM,
+	FDGETPRM,
+	FDMSGON,
+	FDMSGOFF,
+	FDFMTBEG,
+	FDFMTTRK,
+	FDFMTEND,
+	FDSETEMSGTRESH,
+	FDFLUSH,
+	FDSETMAXERRS,
+	FDGETMAXERRS,
+	FDGETDRVTYP,
+	FDSETDRVPRM,
+	FDGETDRVPRM,
+	FDGETDRVSTAT,
+	FDPOLLDRVSTAT,
+	FDRESET,
+	FDGETFDCSTAT,
+	FDWERRORCLR,
+	FDWERRORGET,
+	FDRAWCMD,
+	FDEJECT,
+	FDTWADDLE
+};
+
+static inline int normalize_ioctl(int *cmd, int *size)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
+		if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
+			*size = _IOC_SIZE(*cmd);
+			*cmd = ioctl_table[i];
+			if (*size > _IOC_SIZE(*cmd)) {
+				printk("ioctl not yet supported\n");
+				return -EFAULT;
+			}
+			return 0;
+		}
+	}
+	return -EINVAL;
+}
+
+static int get_floppy_geometry(int drive, int type, struct floppy_struct **g)
+{
+	if (type)
+		*g = &floppy_type[type];
+	else {
+		LOCK_FDC(drive, 0);
+		CALL(poll_drive(0, 0));
+		process_fd_request();
+		*g = current_type[drive];
+	}
+	if (!*g)
+		return -ENODEV;
+	return 0;
+}
+
+static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
+		    unsigned long param)
+{
+#define FD_IOCTL_ALLOWED ((filp) && (filp)->private_data)
+#define OUT(c,x) case c: outparam = (const char *) (x); break
+#define IN(c,x,tag) case c: *(x) = inparam. tag ; return 0
+
+	int drive = (long)inode->i_bdev->bd_disk->private_data;
+	int i, type = ITYPE(UDRS->fd_device);
+	int ret;
+	int size;
+	union inparam {
+		struct floppy_struct g;	/* geometry */
+		struct format_descr f;
+		struct floppy_max_errors max_errors;
+		struct floppy_drive_params dp;
+	} inparam;		/* parameters coming from user space */
+	const char *outparam;	/* parameters passed back to user space */
+
+	/* convert compatibility eject ioctls into floppy eject ioctl.
+	 * We do this in order to provide a means to eject floppy disks before
+	 * installing the new fdutils package */
+	if (cmd == CDROMEJECT ||	/* CD-ROM eject */
+	    cmd == 0x6470 /* SunOS floppy eject */ ) {
+		DPRINT("obsolete eject ioctl\n");
+		DPRINT("please use floppycontrol --eject\n");
+		cmd = FDEJECT;
+	}
+
+	/* generic block device ioctls */
+	switch (cmd) {
+		/* the following have been inspired by the corresponding
+		 * code for other block devices. */
+		struct floppy_struct *g;
+	case HDIO_GETGEO:
+		{
+			struct hd_geometry loc;
+			ECALL(get_floppy_geometry(drive, type, &g));
+			loc.heads = g->head;
+			loc.sectors = g->sect;
+			loc.cylinders = g->track;
+			loc.start = 0;
+			return _COPYOUT(loc);
+		}
+	}
+
+	/* convert the old style command into a new style command */
+	if ((cmd & 0xff00) == 0x0200) {
+		ECALL(normalize_ioctl(&cmd, &size));
+	} else
+		return -EINVAL;
+
+	/* permission checks */
+	if (((cmd & 0x40) && !FD_IOCTL_ALLOWED) ||
+	    ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
+		return -EPERM;
+
+	/* copyin */
+	CLEARSTRUCT(&inparam);
+	if (_IOC_DIR(cmd) & _IOC_WRITE)
+	    ECALL(fd_copyin((void __user *)param, &inparam, size))
+
+		switch (cmd) {
+		case FDEJECT:
+			if (UDRS->fd_ref != 1)
+				/* somebody else has this drive open */
+				return -EBUSY;
+			LOCK_FDC(drive, 1);
+
+			/* do the actual eject. Fails on
+			 * non-Sparc architectures */
+			ret = fd_eject(UNIT(drive));
+
+			USETF(FD_DISK_CHANGED);
+			USETF(FD_VERIFY);
+			process_fd_request();
+			return ret;
+		case FDCLRPRM:
+			LOCK_FDC(drive, 1);
+			current_type[drive] = NULL;
+			floppy_sizes[drive] = MAX_DISK_SIZE << 1;
+			UDRS->keep_data = 0;
+			return invalidate_drive(inode->i_bdev);
+		case FDSETPRM:
+		case FDDEFPRM:
+			return set_geometry(cmd, &inparam.g,
+					    drive, type, inode->i_bdev);
+		case FDGETPRM:
+			ECALL(get_floppy_geometry(drive, type,
+						  (struct floppy_struct **)
+						  &outparam));
+			break;
+
+		case FDMSGON:
+			UDP->flags |= FTD_MSG;
+			return 0;
+		case FDMSGOFF:
+			UDP->flags &= ~FTD_MSG;
+			return 0;
+
+		case FDFMTBEG:
+			LOCK_FDC(drive, 1);
+			CALL(poll_drive(1, FD_RAW_NEED_DISK));
+			ret = UDRS->flags;
+			process_fd_request();
+			if (ret & FD_VERIFY)
+				return -ENODEV;
+			if (!(ret & FD_DISK_WRITABLE))
+				return -EROFS;
+			return 0;
+		case FDFMTTRK:
+			if (UDRS->fd_ref != 1)
+				return -EBUSY;
+			return do_format(drive, &inparam.f);
+		case FDFMTEND:
+		case FDFLUSH:
+			LOCK_FDC(drive, 1);
+			return invalidate_drive(inode->i_bdev);
+
+		case FDSETEMSGTRESH:
+			UDP->max_errors.reporting =
+			    (unsigned short)(param & 0x0f);
+			return 0;
+			OUT(FDGETMAXERRS, &UDP->max_errors);
+			IN(FDSETMAXERRS, &UDP->max_errors, max_errors);
+
+		case FDGETDRVTYP:
+			outparam = drive_name(type, drive);
+			SUPBOUND(size, strlen(outparam) + 1);
+			break;
+
+			IN(FDSETDRVPRM, UDP, dp);
+			OUT(FDGETDRVPRM, UDP);
+
+		case FDPOLLDRVSTAT:
+			LOCK_FDC(drive, 1);
+			CALL(poll_drive(1, FD_RAW_NEED_DISK));
+			process_fd_request();
+			/* fall through */
+			OUT(FDGETDRVSTAT, UDRS);
+
+		case FDRESET:
+			return user_reset_fdc(drive, (int)param, 1);
+
+			OUT(FDGETFDCSTAT, UFDCS);
+
+		case FDWERRORCLR:
+			CLEARSTRUCT(UDRWE);
+			return 0;
+			OUT(FDWERRORGET, UDRWE);
+
+		case FDRAWCMD:
+			if (type)
+				return -EINVAL;
+			LOCK_FDC(drive, 1);
+			set_floppy(drive);
+			CALL(i = raw_cmd_ioctl(cmd, (void __user *)param));
+			process_fd_request();
+			return i;
+
+		case FDTWADDLE:
+			LOCK_FDC(drive, 1);
+			twaddle();
+			process_fd_request();
+			return 0;
+
+		default:
+			return -EINVAL;
+		}
+
+	if (_IOC_DIR(cmd) & _IOC_READ)
+		return fd_copyout((void __user *)param, outparam, size);
+	else
+		return 0;
+#undef OUT
+#undef IN
+}
+
+static void __init config_types(void)
+{
+	int first = 1;
+	int drive;
+
+	/* read drive info out of physical CMOS */
+	drive = 0;
+	if (!UDP->cmos)
+		UDP->cmos = FLOPPY0_TYPE;
+	drive = 1;
+	if (!UDP->cmos && FLOPPY1_TYPE)
+		UDP->cmos = FLOPPY1_TYPE;
+
+	/* XXX */
+	/* additional physical CMOS drive detection should go here */
+
+	for (drive = 0; drive < N_DRIVE; drive++) {
+		unsigned int type = UDP->cmos;
+		struct floppy_drive_params *params;
+		const char *name = NULL;
+		static char temparea[32];
+
+		if (type < NUMBER(default_drive_params)) {
+			params = &default_drive_params[type].params;
+			if (type) {
+				name = default_drive_params[type].name;
+				allowed_drive_mask |= 1 << drive;
+			} else
+				allowed_drive_mask &= ~(1 << drive);
+		} else {
+			params = &default_drive_params[0].params;
+			sprintf(temparea, "unknown type %d (usb?)", type);
+			name = temparea;
+		}
+		if (name) {
+			const char *prepend = ",";
+			if (first) {
+				prepend = KERN_INFO "Floppy drive(s):";
+				first = 0;
+			}
+			printk("%s fd%d is %s", prepend, drive, name);
+			register_devfs_entries(drive);
+		}
+		*UDP = *params;
+	}
+	if (!first)
+		printk("\n");
+}
+
+static int floppy_release(struct inode *inode, struct file *filp)
+{
+	int drive = (long)inode->i_bdev->bd_disk->private_data;
+
+	down(&open_lock);
+	if (UDRS->fd_ref < 0)
+		UDRS->fd_ref = 0;
+	else if (!UDRS->fd_ref--) {
+		DPRINT("floppy_release with fd_ref == 0");
+		UDRS->fd_ref = 0;
+	}
+	if (!UDRS->fd_ref)
+		opened_bdev[drive] = NULL;
+	floppy_release_irq_and_dma();
+	up(&open_lock);
+	return 0;
+}
+
+/*
+ * floppy_open check for aliasing (/dev/fd0 can be the same as
+ * /dev/PS0 etc), and disallows simultaneous access to the same
+ * drive with different device numbers.
+ */
+static int floppy_open(struct inode *inode, struct file *filp)
+{
+	int drive = (long)inode->i_bdev->bd_disk->private_data;
+	int old_dev;
+	int try;
+	int res = -EBUSY;
+	char *tmp;
+
+	filp->private_data = (void *)0;
+	down(&open_lock);
+	old_dev = UDRS->fd_device;
+	if (opened_bdev[drive] && opened_bdev[drive] != inode->i_bdev)
+		goto out2;
+
+	if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) {
+		USETF(FD_DISK_CHANGED);
+		USETF(FD_VERIFY);
+	}
+
+	if (UDRS->fd_ref == -1 || (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
+		goto out2;
+
+	if (floppy_grab_irq_and_dma())
+		goto out2;
+
+	if (filp->f_flags & O_EXCL)
+		UDRS->fd_ref = -1;
+	else
+		UDRS->fd_ref++;
+
+	opened_bdev[drive] = inode->i_bdev;
+
+	res = -ENXIO;
+
+	if (!floppy_track_buffer) {
+		/* if opening an ED drive, reserve a big buffer,
+		 * else reserve a small one */
+		if ((UDP->cmos == 6) || (UDP->cmos == 5))
+			try = 64;	/* Only 48 actually useful */
+		else
+			try = 32;	/* Only 24 actually useful */
+
+		tmp = (char *)fd_dma_mem_alloc(1024 * try);
+		if (!tmp && !floppy_track_buffer) {
+			try >>= 1;	/* buffer only one side */
+			INFBOUND(try, 16);
+			tmp = (char *)fd_dma_mem_alloc(1024 * try);
+		}
+		if (!tmp && !floppy_track_buffer) {
+			fallback_on_nodma_alloc(&tmp, 2048 * try);
+		}
+		if (!tmp && !floppy_track_buffer) {
+			DPRINT("Unable to allocate DMA memory\n");
+			goto out;
+		}
+		if (floppy_track_buffer) {
+			if (tmp)
+				fd_dma_mem_free((unsigned long)tmp, try * 1024);
+		} else {
+			buffer_min = buffer_max = -1;
+			floppy_track_buffer = tmp;
+			max_buffer_sectors = try;
+		}
+	}
+
+	UDRS->fd_device = iminor(inode);
+	set_capacity(disks[drive], floppy_sizes[iminor(inode)]);
+	if (old_dev != -1 && old_dev != iminor(inode)) {
+		if (buffer_drive == drive)
+			buffer_track = -1;
+	}
+
+	/* Allow ioctls if we have write-permissions even if read-only open.
+	 * Needed so that programs such as fdrawcmd still can work on write
+	 * protected disks */
+	if (filp->f_mode & 2
+	    || permission(filp->f_dentry->d_inode, 2, NULL) == 0)
+		filp->private_data = (void *)8;
+
+	if (UFDCS->rawcmd == 1)
+		UFDCS->rawcmd = 2;
+
+	if (!(filp->f_flags & O_NDELAY)) {
+		if (filp->f_mode & 3) {
+			UDRS->last_checked = 0;
+			check_disk_change(inode->i_bdev);
+			if (UTESTF(FD_DISK_CHANGED))
+				goto out;
+		}
+		res = -EROFS;
+		if ((filp->f_mode & 2) && !(UTESTF(FD_DISK_WRITABLE)))
+			goto out;
+	}
+	up(&open_lock);
+	return 0;
+out:
+	if (UDRS->fd_ref < 0)
+		UDRS->fd_ref = 0;
+	else
+		UDRS->fd_ref--;
+	if (!UDRS->fd_ref)
+		opened_bdev[drive] = NULL;
+	floppy_release_irq_and_dma();
+out2:
+	up(&open_lock);
+	return res;
+}
+
+/*
+ * Check if the disk has been changed or if a change has been faked.
+ */
+static int check_floppy_change(struct gendisk *disk)
+{
+	int drive = (long)disk->private_data;
+
+	if (UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY))
+		return 1;
+
+	if (UDP->checkfreq < (int)(jiffies - UDRS->last_checked)) {
+		if (floppy_grab_irq_and_dma()) {
+			return 1;
+		}
+
+		lock_fdc(drive, 0);
+		poll_drive(0, 0);
+		process_fd_request();
+		floppy_release_irq_and_dma();
+	}
+
+	if (UTESTF(FD_DISK_CHANGED) ||
+	    UTESTF(FD_VERIFY) ||
+	    test_bit(drive, &fake_change) ||
+	    (!ITYPE(UDRS->fd_device) && !current_type[drive]))
+		return 1;
+	return 0;
+}
+
+/*
+ * This implements "read block 0" for floppy_revalidate().
+ * Needed for format autodetection, checking whether there is
+ * a disk in the drive, and whether that disk is writable.
+ */
+
+static int floppy_rb0_complete(struct bio *bio, unsigned int bytes_done,
+			       int err)
+{
+	if (bio->bi_size)
+		return 1;
+
+	complete((struct completion *)bio->bi_private);
+	return 0;
+}
+
+static int __floppy_read_block_0(struct block_device *bdev)
+{
+	struct bio bio;
+	struct bio_vec bio_vec;
+	struct completion complete;
+	struct page *page;
+	size_t size;
+
+	page = alloc_page(GFP_NOIO);
+	if (!page) {
+		process_fd_request();
+		return -ENOMEM;
+	}
+
+	size = bdev->bd_block_size;
+	if (!size)
+		size = 1024;
+
+	bio_init(&bio);
+	bio.bi_io_vec = &bio_vec;
+	bio_vec.bv_page = page;
+	bio_vec.bv_len = size;
+	bio_vec.bv_offset = 0;
+	bio.bi_vcnt = 1;
+	bio.bi_idx = 0;
+	bio.bi_size = size;
+	bio.bi_bdev = bdev;
+	bio.bi_sector = 0;
+	init_completion(&complete);
+	bio.bi_private = &complete;
+	bio.bi_end_io = floppy_rb0_complete;
+
+	submit_bio(READ, &bio);
+	generic_unplug_device(bdev_get_queue(bdev));
+	process_fd_request();
+	wait_for_completion(&complete);
+
+	__free_page(page);
+
+	return 0;
+}
+
+/* revalidate the floppy disk, i.e. trigger format autodetection by reading
+ * the bootblock (block 0). "Autodetection" is also needed to check whether
+ * there is a disk in the drive at all... Thus we also do it for fixed
+ * geometry formats */
+static int floppy_revalidate(struct gendisk *disk)
+{
+	int drive = (long)disk->private_data;
+#define NO_GEOM (!current_type[drive] && !ITYPE(UDRS->fd_device))
+	int cf;
+	int res = 0;
+
+	if (UTESTF(FD_DISK_CHANGED) ||
+	    UTESTF(FD_VERIFY) || test_bit(drive, &fake_change) || NO_GEOM) {
+		if (usage_count == 0) {
+			printk("VFS: revalidate called on non-open device.\n");
+			return -EFAULT;
+		}
+		lock_fdc(drive, 0);
+		cf = UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY);
+		if (!(cf || test_bit(drive, &fake_change) || NO_GEOM)) {
+			process_fd_request();	/*already done by another thread */
+			return 0;
+		}
+		UDRS->maxblock = 0;
+		UDRS->maxtrack = 0;
+		if (buffer_drive == drive)
+			buffer_track = -1;
+		clear_bit(drive, &fake_change);
+		UCLEARF(FD_DISK_CHANGED);
+		if (cf)
+			UDRS->generation++;
+		if (NO_GEOM) {
+			/* auto-sensing */
+			res = __floppy_read_block_0(opened_bdev[drive]);
+		} else {
+			if (cf)
+				poll_drive(0, FD_RAW_NEED_DISK);
+			process_fd_request();
+		}
+	}
+	set_capacity(disk, floppy_sizes[UDRS->fd_device]);
+	return res;
+}
+
+static struct block_device_operations floppy_fops = {
+	.owner		= THIS_MODULE,
+	.open		= floppy_open,
+	.release	= floppy_release,
+	.ioctl		= fd_ioctl,
+	.media_changed	= check_floppy_change,
+	.revalidate_disk = floppy_revalidate,
+};
+static char *table[] = {
+	"", "d360", "h1200", "u360", "u720", "h360", "h720",
+	"u1440", "u2880", "CompaQ", "h1440", "u1680", "h410",
+	"u820", "h1476", "u1722", "h420", "u830", "h1494", "u1743",
+	"h880", "u1040", "u1120", "h1600", "u1760", "u1920",
+	"u3200", "u3520", "u3840", "u1840", "u800", "u1600",
+	NULL
+};
+static int t360[] = { 1, 0 },
+	t1200[] = { 2, 5, 6, 10, 12, 14, 16, 18, 20, 23, 0 },
+	t3in[] = { 8, 9, 26, 27, 28, 7, 11, 15, 19, 24, 25, 29, 31, 3, 4, 13,
+			17, 21, 22, 30, 0 };
+static int *table_sup[] =
+    { NULL, t360, t1200, t3in + 5 + 8, t3in + 5, t3in, t3in };
+
+static void __init register_devfs_entries(int drive)
+{
+	int base_minor = (drive < 4) ? drive : (124 + drive);
+
+	if (UDP->cmos < NUMBER(default_drive_params)) {
+		int i = 0;
+		do {
+			int minor = base_minor + (table_sup[UDP->cmos][i] << 2);
+
+			devfs_mk_bdev(MKDEV(FLOPPY_MAJOR, minor),
+				      S_IFBLK | S_IRUSR | S_IWUSR | S_IRGRP |
+				      S_IWGRP, "floppy/%d%s", drive,
+				      table[table_sup[UDP->cmos][i]]);
+		} while (table_sup[UDP->cmos][i++]);
+	}
+}
+
+/*
+ * Floppy Driver initialization
+ * =============================
+ */
+
+/* Determine the floppy disk controller type */
+/* This routine was written by David C. Niemi */
+static char __init get_fdc_version(void)
+{
+	int r;
+
+	output_byte(FD_DUMPREGS);	/* 82072 and better know DUMPREGS */
+	if (FDCS->reset)
+		return FDC_NONE;
+	if ((r = result()) <= 0x00)
+		return FDC_NONE;	/* No FDC present ??? */
+	if ((r == 1) && (reply_buffer[0] == 0x80)) {
+		printk(KERN_INFO "FDC %d is an 8272A\n", fdc);
+		return FDC_8272A;	/* 8272a/765 don't know DUMPREGS */
+	}
+	if (r != 10) {
+		printk
+		    ("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
+		     fdc, r);
+		return FDC_UNKNOWN;
+	}
+
+	if (!fdc_configure()) {
+		printk(KERN_INFO "FDC %d is an 82072\n", fdc);
+		return FDC_82072;	/* 82072 doesn't know CONFIGURE */
+	}
+
+	output_byte(FD_PERPENDICULAR);
+	if (need_more_output() == MORE_OUTPUT) {
+		output_byte(0);
+	} else {
+		printk(KERN_INFO "FDC %d is an 82072A\n", fdc);
+		return FDC_82072A;	/* 82072A as found on Sparcs. */
+	}
+
+	output_byte(FD_UNLOCK);
+	r = result();
+	if ((r == 1) && (reply_buffer[0] == 0x80)) {
+		printk(KERN_INFO "FDC %d is a pre-1991 82077\n", fdc);
+		return FDC_82077_ORIG;	/* Pre-1991 82077, doesn't know 
+					 * LOCK/UNLOCK */
+	}
+	if ((r != 1) || (reply_buffer[0] != 0x00)) {
+		printk("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
+		       fdc, r);
+		return FDC_UNKNOWN;
+	}
+	output_byte(FD_PARTID);
+	r = result();
+	if (r != 1) {
+		printk("FDC %d init: PARTID: unexpected return of %d bytes.\n",
+		       fdc, r);
+		return FDC_UNKNOWN;
+	}
+	if (reply_buffer[0] == 0x80) {
+		printk(KERN_INFO "FDC %d is a post-1991 82077\n", fdc);
+		return FDC_82077;	/* Revised 82077AA passes all the tests */
+	}
+	switch (reply_buffer[0] >> 5) {
+	case 0x0:
+		/* Either a 82078-1 or a 82078SL running at 5Volt */
+		printk(KERN_INFO "FDC %d is an 82078.\n", fdc);
+		return FDC_82078;
+	case 0x1:
+		printk(KERN_INFO "FDC %d is a 44pin 82078\n", fdc);
+		return FDC_82078;
+	case 0x2:
+		printk(KERN_INFO "FDC %d is a S82078B\n", fdc);
+		return FDC_S82078B;
+	case 0x3:
+		printk(KERN_INFO "FDC %d is a National Semiconductor PC87306\n",
+		       fdc);
+		return FDC_87306;
+	default:
+		printk(KERN_INFO
+		       "FDC %d init: 82078 variant with unknown PARTID=%d.\n",
+		       fdc, reply_buffer[0] >> 5);
+		return FDC_82078_UNKN;
+	}
+}				/* get_fdc_version */
+
+/* lilo configuration */
+
+static void __init floppy_set_flags(int *ints, int param, int param2)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
+		if (param)
+			default_drive_params[i].params.flags |= param2;
+		else
+			default_drive_params[i].params.flags &= ~param2;
+	}
+	DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param);
+}
+
+static void __init daring(int *ints, int param, int param2)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
+		if (param) {
+			default_drive_params[i].params.select_delay = 0;
+			default_drive_params[i].params.flags |=
+			    FD_SILENT_DCL_CLEAR;
+		} else {
+			default_drive_params[i].params.select_delay =
+			    2 * HZ / 100;
+			default_drive_params[i].params.flags &=
+			    ~FD_SILENT_DCL_CLEAR;
+		}
+	}
+	DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken");
+}
+
+static void __init set_cmos(int *ints, int dummy, int dummy2)
+{
+	int current_drive = 0;
+
+	if (ints[0] != 2) {
+		DPRINT("wrong number of parameters for CMOS\n");
+		return;
+	}
+	current_drive = ints[1];
+	if (current_drive < 0 || current_drive >= 8) {
+		DPRINT("bad drive for set_cmos\n");
+		return;
+	}
+#if N_FDC > 1
+	if (current_drive >= 4 && !FDC2)
+		FDC2 = 0x370;
+#endif
+	DP->cmos = ints[2];
+	DPRINT("setting CMOS code to %d\n", ints[2]);
+}
+
+static struct param_table {
+	const char *name;
+	void (*fn) (int *ints, int param, int param2);
+	int *var;
+	int def_param;
+	int param2;
+} config_params[] __initdata = {
+	{"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
+	{"all_drives", NULL, &allowed_drive_mask, 0xff, 0},	/* obsolete */
+	{"asus_pci", NULL, &allowed_drive_mask, 0x33, 0},
+	{"irq", NULL, &FLOPPY_IRQ, 6, 0},
+	{"dma", NULL, &FLOPPY_DMA, 2, 0},
+	{"daring", daring, NULL, 1, 0},
+#if N_FDC > 1
+	{"two_fdc", NULL, &FDC2, 0x370, 0},
+	{"one_fdc", NULL, &FDC2, 0, 0},
+#endif
+	{"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL},
+	{"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL},
+	{"messages", floppy_set_flags, NULL, 1, FTD_MSG},
+	{"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR},
+	{"debug", floppy_set_flags, NULL, 1, FD_DEBUG},
+	{"nodma", NULL, &can_use_virtual_dma, 1, 0},
+	{"omnibook", NULL, &can_use_virtual_dma, 1, 0},
+	{"yesdma", NULL, &can_use_virtual_dma, 0, 0},
+	{"fifo_depth", NULL, &fifo_depth, 0xa, 0},
+	{"nofifo", NULL, &no_fifo, 0x20, 0},
+	{"usefifo", NULL, &no_fifo, 0, 0},
+	{"cmos", set_cmos, NULL, 0, 0},
+	{"slow", NULL, &slow_floppy, 1, 0},
+	{"unexpected_interrupts", NULL, &print_unex, 1, 0},
+	{"no_unexpected_interrupts", NULL, &print_unex, 0, 0},
+	{"L40SX", NULL, &print_unex, 0, 0}
+
+	EXTRA_FLOPPY_PARAMS
+};
+
+static int __init floppy_setup(char *str)
+{
+	int i;
+	int param;
+	int ints[11];
+
+	str = get_options(str, ARRAY_SIZE(ints), ints);
+	if (str) {
+		for (i = 0; i < ARRAY_SIZE(config_params); i++) {
+			if (strcmp(str, config_params[i].name) == 0) {
+				if (ints[0])
+					param = ints[1];
+				else
+					param = config_params[i].def_param;
+				if (config_params[i].fn)
+					config_params[i].
+					    fn(ints, param,
+					       config_params[i].param2);
+				if (config_params[i].var) {
+					DPRINT("%s=%d\n", str, param);
+					*config_params[i].var = param;
+				}
+				return 1;
+			}
+		}
+	}
+	if (str) {
+		DPRINT("unknown floppy option [%s]\n", str);
+
+		DPRINT("allowed options are:");
+		for (i = 0; i < ARRAY_SIZE(config_params); i++)
+			printk(" %s", config_params[i].name);
+		printk("\n");
+	} else
+		DPRINT("botched floppy option\n");
+	DPRINT("Read Documentation/floppy.txt\n");
+	return 0;
+}
+
+static int have_no_fdc = -ENODEV;
+
+static void floppy_device_release(struct device *dev)
+{
+	complete(&device_release);
+}
+
+static struct platform_device floppy_device = {
+	.name		= "floppy",
+	.id		= 0,
+	.dev		= {
+			.release = floppy_device_release,
+			}
+};
+
+static struct kobject *floppy_find(dev_t dev, int *part, void *data)
+{
+	int drive = (*part & 3) | ((*part & 0x80) >> 5);
+	if (drive >= N_DRIVE ||
+	    !(allowed_drive_mask & (1 << drive)) ||
+	    fdc_state[FDC(drive)].version == FDC_NONE)
+		return NULL;
+	if (((*part >> 2) & 0x1f) >= NUMBER(floppy_type))
+		return NULL;
+	*part = 0;
+	return get_disk(disks[drive]);
+}
+
+static int __init floppy_init(void)
+{
+	int i, unit, drive;
+	int err, dr;
+
+	raw_cmd = NULL;
+
+	for (dr = 0; dr < N_DRIVE; dr++) {
+		disks[dr] = alloc_disk(1);
+		if (!disks[dr]) {
+			err = -ENOMEM;
+			goto out_put_disk;
+		}
+
+		disks[dr]->major = FLOPPY_MAJOR;
+		disks[dr]->first_minor = TOMINOR(dr);
+		disks[dr]->fops = &floppy_fops;
+		sprintf(disks[dr]->disk_name, "fd%d", dr);
+
+		init_timer(&motor_off_timer[dr]);
+		motor_off_timer[dr].data = dr;
+		motor_off_timer[dr].function = motor_off_callback;
+	}
+
+	devfs_mk_dir("floppy");
+
+	err = register_blkdev(FLOPPY_MAJOR, "fd");
+	if (err)
+		goto out_devfs_remove;
+
+	floppy_queue = blk_init_queue(do_fd_request, &floppy_lock);
+	if (!floppy_queue) {
+		err = -ENOMEM;
+		goto out_unreg_blkdev;
+	}
+	blk_queue_max_sectors(floppy_queue, 64);
+
+	blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
+			    floppy_find, NULL, NULL);
+
+	for (i = 0; i < 256; i++)
+		if (ITYPE(i))
+			floppy_sizes[i] = floppy_type[ITYPE(i)].size;
+		else
+			floppy_sizes[i] = MAX_DISK_SIZE << 1;
+
+	reschedule_timeout(MAXTIMEOUT, "floppy init", MAXTIMEOUT);
+	config_types();
+
+	for (i = 0; i < N_FDC; i++) {
+		fdc = i;
+		CLEARSTRUCT(FDCS);
+		FDCS->dtr = -1;
+		FDCS->dor = 0x4;
+#if defined(__sparc__) || defined(__mc68000__)
+		/*sparcs/sun3x don't have a DOR reset which we can fall back on to */
+#ifdef __mc68000__
+		if (MACH_IS_SUN3X)
+#endif
+			FDCS->version = FDC_82072A;
+#endif
+	}
+
+	use_virtual_dma = can_use_virtual_dma & 1;
+#if defined(CONFIG_PPC64)
+	if (check_legacy_ioport(FDC1)) {
+		del_timer(&fd_timeout);
+		err = -ENODEV;
+		goto out_unreg_region;
+	}
+#endif
+	fdc_state[0].address = FDC1;
+	if (fdc_state[0].address == -1) {
+		del_timer(&fd_timeout);
+		err = -ENODEV;
+		goto out_unreg_region;
+	}
+#if N_FDC > 1
+	fdc_state[1].address = FDC2;
+#endif
+
+	fdc = 0;		/* reset fdc in case of unexpected interrupt */
+	err = floppy_grab_irq_and_dma();
+	if (err) {
+		del_timer(&fd_timeout);
+		err = -EBUSY;
+		goto out_unreg_region;
+	}
+
+	/* initialise drive state */
+	for (drive = 0; drive < N_DRIVE; drive++) {
+		CLEARSTRUCT(UDRS);
+		CLEARSTRUCT(UDRWE);
+		USETF(FD_DISK_NEWCHANGE);
+		USETF(FD_DISK_CHANGED);
+		USETF(FD_VERIFY);
+		UDRS->fd_device = -1;
+		floppy_track_buffer = NULL;
+		max_buffer_sectors = 0;
+	}
+	/*
+	 * Small 10 msec delay to let through any interrupt that
+	 * initialization might have triggered, to not
+	 * confuse detection:
+	 */
+	msleep(10);
+
+	for (i = 0; i < N_FDC; i++) {
+		fdc = i;
+		FDCS->driver_version = FD_DRIVER_VERSION;
+		for (unit = 0; unit < 4; unit++)
+			FDCS->track[unit] = 0;
+		if (FDCS->address == -1)
+			continue;
+		FDCS->rawcmd = 2;
+		if (user_reset_fdc(-1, FD_RESET_ALWAYS, 0)) {
+			/* free ioports reserved by floppy_grab_irq_and_dma() */
+			release_region(FDCS->address + 2, 4);
+			release_region(FDCS->address + 7, 1);
+			FDCS->address = -1;
+			FDCS->version = FDC_NONE;
+			continue;
+		}
+		/* Try to determine the floppy controller type */
+		FDCS->version = get_fdc_version();
+		if (FDCS->version == FDC_NONE) {
+			/* free ioports reserved by floppy_grab_irq_and_dma() */
+			release_region(FDCS->address + 2, 4);
+			release_region(FDCS->address + 7, 1);
+			FDCS->address = -1;
+			continue;
+		}
+		if (can_use_virtual_dma == 2 && FDCS->version < FDC_82072A)
+			can_use_virtual_dma = 0;
+
+		have_no_fdc = 0;
+		/* Not all FDCs seem to be able to handle the version command
+		 * properly, so force a reset for the standard FDC clones,
+		 * to avoid interrupt garbage.
+		 */
+		user_reset_fdc(-1, FD_RESET_ALWAYS, 0);
+	}
+	fdc = 0;
+	del_timer(&fd_timeout);
+	current_drive = 0;
+	floppy_release_irq_and_dma();
+	initialising = 0;
+	if (have_no_fdc) {
+		DPRINT("no floppy controllers found\n");
+		err = have_no_fdc;
+		goto out_flush_work;
+	}
+
+	err = platform_device_register(&floppy_device);
+	if (err)
+		goto out_flush_work;
+
+	for (drive = 0; drive < N_DRIVE; drive++) {
+		if (!(allowed_drive_mask & (1 << drive)))
+			continue;
+		if (fdc_state[FDC(drive)].version == FDC_NONE)
+			continue;
+		/* to be cleaned up... */
+		disks[drive]->private_data = (void *)(long)drive;
+		disks[drive]->queue = floppy_queue;
+		disks[drive]->flags |= GENHD_FL_REMOVABLE;
+		disks[drive]->driverfs_dev = &floppy_device.dev;
+		add_disk(disks[drive]);
+	}
+
+	return 0;
+
+out_flush_work:
+	flush_scheduled_work();
+	if (usage_count)
+		floppy_release_irq_and_dma();
+out_unreg_region:
+	blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
+	blk_cleanup_queue(floppy_queue);
+out_unreg_blkdev:
+	unregister_blkdev(FLOPPY_MAJOR, "fd");
+out_devfs_remove:
+	devfs_remove("floppy");
+out_put_disk:
+	while (dr--) {
+		del_timer(&motor_off_timer[dr]);
+		put_disk(disks[dr]);
+	}
+	return err;
+}
+
+static DEFINE_SPINLOCK(floppy_usage_lock);
+
+static int floppy_grab_irq_and_dma(void)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&floppy_usage_lock, flags);
+	if (usage_count++) {
+		spin_unlock_irqrestore(&floppy_usage_lock, flags);
+		return 0;
+	}
+	spin_unlock_irqrestore(&floppy_usage_lock, flags);
+	if (fd_request_irq()) {
+		DPRINT("Unable to grab IRQ%d for the floppy driver\n",
+		       FLOPPY_IRQ);
+		spin_lock_irqsave(&floppy_usage_lock, flags);
+		usage_count--;
+		spin_unlock_irqrestore(&floppy_usage_lock, flags);
+		return -1;
+	}
+	if (fd_request_dma()) {
+		DPRINT("Unable to grab DMA%d for the floppy driver\n",
+		       FLOPPY_DMA);
+		fd_free_irq();
+		spin_lock_irqsave(&floppy_usage_lock, flags);
+		usage_count--;
+		spin_unlock_irqrestore(&floppy_usage_lock, flags);
+		return -1;
+	}
+
+	for (fdc = 0; fdc < N_FDC; fdc++) {
+		if (FDCS->address != -1) {
+			if (!request_region(FDCS->address + 2, 4, "floppy")) {
+				DPRINT("Floppy io-port 0x%04lx in use\n",
+				       FDCS->address + 2);
+				goto cleanup1;
+			}
+			if (!request_region(FDCS->address + 7, 1, "floppy DIR")) {
+				DPRINT("Floppy io-port 0x%04lx in use\n",
+				       FDCS->address + 7);
+				goto cleanup2;
+			}
+			/* address + 6 is reserved, and may be taken by IDE.
+			 * Unfortunately, Adaptec doesn't know this :-(, */
+		}
+	}
+	for (fdc = 0; fdc < N_FDC; fdc++) {
+		if (FDCS->address != -1) {
+			reset_fdc_info(1);
+			fd_outb(FDCS->dor, FD_DOR);
+		}
+	}
+	fdc = 0;
+	set_dor(0, ~0, 8);	/* avoid immediate interrupt */
+
+	for (fdc = 0; fdc < N_FDC; fdc++)
+		if (FDCS->address != -1)
+			fd_outb(FDCS->dor, FD_DOR);
+	/*
+	 *      The driver will try and free resources and relies on us
+	 *      to know if they were allocated or not.
+	 */
+	fdc = 0;
+	irqdma_allocated = 1;
+	return 0;
+cleanup2:
+	release_region(FDCS->address + 2, 4);
+cleanup1:
+	fd_free_irq();
+	fd_free_dma();
+	while (--fdc >= 0) {
+		release_region(FDCS->address + 2, 4);
+		release_region(FDCS->address + 7, 1);
+	}
+	spin_lock_irqsave(&floppy_usage_lock, flags);
+	usage_count--;
+	spin_unlock_irqrestore(&floppy_usage_lock, flags);
+	return -1;
+}
+
+static void floppy_release_irq_and_dma(void)
+{
+	int old_fdc;
+#ifdef FLOPPY_SANITY_CHECK
+#ifndef __sparc__
+	int drive;
+#endif
+#endif
+	long tmpsize;
+	unsigned long tmpaddr;
+	unsigned long flags;
+
+	spin_lock_irqsave(&floppy_usage_lock, flags);
+	if (--usage_count) {
+		spin_unlock_irqrestore(&floppy_usage_lock, flags);
+		return;
+	}
+	spin_unlock_irqrestore(&floppy_usage_lock, flags);
+	if (irqdma_allocated) {
+		fd_disable_dma();
+		fd_free_dma();
+		fd_free_irq();
+		irqdma_allocated = 0;
+	}
+	set_dor(0, ~0, 8);
+#if N_FDC > 1
+	set_dor(1, ~8, 0);
+#endif
+	floppy_enable_hlt();
+
+	if (floppy_track_buffer && max_buffer_sectors) {
+		tmpsize = max_buffer_sectors * 1024;
+		tmpaddr = (unsigned long)floppy_track_buffer;
+		floppy_track_buffer = NULL;
+		max_buffer_sectors = 0;
+		buffer_min = buffer_max = -1;
+		fd_dma_mem_free(tmpaddr, tmpsize);
+	}
+#ifdef FLOPPY_SANITY_CHECK
+#ifndef __sparc__
+	for (drive = 0; drive < N_FDC * 4; drive++)
+		if (timer_pending(motor_off_timer + drive))
+			printk("motor off timer %d still active\n", drive);
+#endif
+
+	if (timer_pending(&fd_timeout))
+		printk("floppy timer still active:%s\n", timeout_message);
+	if (timer_pending(&fd_timer))
+		printk("auxiliary floppy timer still active\n");
+	if (floppy_work.pending)
+		printk("work still pending\n");
+#endif
+	old_fdc = fdc;
+	for (fdc = 0; fdc < N_FDC; fdc++)
+		if (FDCS->address != -1) {
+			release_region(FDCS->address + 2, 4);
+			release_region(FDCS->address + 7, 1);
+		}
+	fdc = old_fdc;
+}
+
+#ifdef MODULE
+
+static char *floppy;
+
+static void unregister_devfs_entries(int drive)
+{
+	int i;
+
+	if (UDP->cmos < NUMBER(default_drive_params)) {
+		i = 0;
+		do {
+			devfs_remove("floppy/%d%s", drive,
+				     table[table_sup[UDP->cmos][i]]);
+		} while (table_sup[UDP->cmos][i++]);
+	}
+}
+
+static void __init parse_floppy_cfg_string(char *cfg)
+{
+	char *ptr;
+
+	while (*cfg) {
+		for (ptr = cfg; *cfg && *cfg != ' ' && *cfg != '\t'; cfg++) ;
+		if (*cfg) {
+			*cfg = '\0';
+			cfg++;
+		}
+		if (*ptr)
+			floppy_setup(ptr);
+	}
+}
+
+int init_module(void)
+{
+	if (floppy)
+		parse_floppy_cfg_string(floppy);
+	return floppy_init();
+}
+
+void cleanup_module(void)
+{
+	int drive;
+
+	init_completion(&device_release);
+	blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
+	unregister_blkdev(FLOPPY_MAJOR, "fd");
+
+	for (drive = 0; drive < N_DRIVE; drive++) {
+		del_timer_sync(&motor_off_timer[drive]);
+
+		if ((allowed_drive_mask & (1 << drive)) &&
+		    fdc_state[FDC(drive)].version != FDC_NONE) {
+			del_gendisk(disks[drive]);
+			unregister_devfs_entries(drive);
+		}
+		put_disk(disks[drive]);
+	}
+	platform_device_unregister(&floppy_device);
+	devfs_remove("floppy");
+
+	del_timer_sync(&fd_timeout);
+	del_timer_sync(&fd_timer);
+	blk_cleanup_queue(floppy_queue);
+
+	if (usage_count)
+		floppy_release_irq_and_dma();
+
+	/* eject disk, if any */
+	fd_eject(0);
+
+	wait_for_completion(&device_release);
+}
+
+module_param(floppy, charp, 0);
+module_param(FLOPPY_IRQ, int, 0);
+module_param(FLOPPY_DMA, int, 0);
+MODULE_AUTHOR("Alain L. Knaff");
+MODULE_SUPPORTED_DEVICE("fd");
+MODULE_LICENSE("GPL");
+
+#else
+
+__setup("floppy=", floppy_setup);
+module_init(floppy_init)
+#endif
+
+MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);