Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 5029 insertions, 0 deletions

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
new file mode 100644
index 0000000000..ea4eb88a2e
--- /dev/null
+++ b/drivers/block/floppy.c
@@ -0,0 +1,5029 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  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.
+ */
+
+/*
+ * 1998/1/21 -- Richard Gooch <rgooch@atnf.csiro.au> -- devfs support
+ */
+
+/*
+ * 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 REALLY_SLOW_IO
+
+#define DEBUGT 2
+
+#define DPRINT(format, args...) \
+	pr_info("floppy%d: " format, current_drive, ##args)
+
+#define DCL_DEBUG		/* debug disk change line */
+#ifdef DCL_DEBUG
+#define debug_dcl(test, fmt, args...) \
+	do { if ((test) & FD_DEBUG) DPRINT(fmt, ##args); } while (0)
+#else
+#define debug_dcl(test, fmt, args...) \
+	do { if (0) DPRINT(fmt, ##args); } while (0)
+#endif
+
+/* 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>
+#include <linux/fdreg.h>
+#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/jiffies.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/major.h>
+#include <linux/platform_device.h>
+#include <linux/mod_devicetable.h>
+#include <linux/mutex.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+#include <linux/async.h>
+#include <linux/compat.h>
+
+/*
+ * 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 DEFINE_MUTEX(floppy_mutex);
+static int slow_floppy;
+
+#include <asm/dma.h>
+#include <asm/irq.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 unsigned short virtual_dma_port = 0x3f0;
+irqreturn_t floppy_interrupt(int irq, void *dev_id);
+static int set_dor(int fdc, char mask, char data);
+
+#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;
+
+#include <linux/blk-mq.h>
+#include <linux/blkpg.h>
+#include <linux/cdrom.h>	/* for the compatibility eject ioctl */
+#include <linux/completion.h>
+
+static LIST_HEAD(floppy_reqs);
+static struct request *current_req;
+static int set_next_request(void);
+
+#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
+
+#ifndef fd_cacheflush
+#define fd_cacheflush(addr, size) /* nothing... */
+#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 */
+	pr_info("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 bool initialized;
+
+#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 */
+	/* reverse mapping from unit and fdc to drive */
+#define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
+
+#define PH_HEAD(floppy, head) (((((floppy)->stretch & 2) >> 1) ^ head) << 2)
+#define STRETCH(floppy)	((floppy)->stretch & FD_STRETCH)
+
+/* read/write commands */
+#define COMMAND			0
+#define DR_SELECT		1
+#define TRACK			2
+#define HEAD			3
+#define SECTOR			4
+#define SIZECODE		5
+#define SECT_PER_TRACK		6
+#define GAP			7
+#define SIZECODE2		8
+#define NR_RW 9
+
+/* format commands */
+#define F_SIZECODE		2
+#define F_SECT_PER_TRACK	3
+#define F_GAP			4
+#define F_FILL			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()'
+ */
+static unsigned char reply_buffer[FD_RAW_REPLY_SIZE];
+static int inr;		/* size of reply buffer, when called from interrupt */
+#define ST0		0
+#define ST1		1
+#define ST2		2
+#define ST3		0	/* result of GETSTATUS */
+#define R_TRACK		3
+#define R_HEAD		4
+#define R_SECTOR	5
+#define R_SIZECODE	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 blk_mq_tag_set tag_sets[N_DRIVE];
+static struct gendisk *opened_disk[N_DRIVE];
+static DEFINE_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'.
+ *
+ * Bits 2 through 9 of 'stretch' tell the number of the first sector.
+ * The LSB (bit 2) is flipped. For most disks, the first sector
+ * is 1 (represented by 0x00<<2).  For some CP/M and music sampler
+ * disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2).
+ * For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2).
+ *
+ * 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"    */
+};
+
+static struct gendisk *disks[N_DRIVE][ARRAY_SIZE(floppy_type)];
+
+#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];
+
+static char floppy_device_name[] = "floppy";
+
+/*
+ * 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);
+
+/* errors encountered on the current (or last) request */
+static int floppy_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;
+
+typedef void (*done_f)(int);
+static const 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(struct work_struct *);
+
+static int floppy_request_regions(int);
+static void floppy_release_regions(int);
+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.
+ */
+static void reset_fdc(void);
+static int floppy_revalidate(struct gendisk *disk);
+
+/*
+ * 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 atomic_t usage_count = ATOMIC_INIT(0);
+
+/* 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 current_fdc;			/* current fdc */
+
+static struct workqueue_struct *floppy_wq;
+
+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 */
+
+static inline unsigned char fdc_inb(int fdc, int reg)
+{
+	return fd_inb(fdc_state[fdc].address, reg);
+}
+
+static inline void fdc_outb(unsigned char value, int fdc, int reg)
+{
+	fd_outb(value, fdc_state[fdc].address, reg);
+}
+
+static inline bool drive_no_geom(int drive)
+{
+	return !current_type[drive] && !ITYPE(drive_state[drive].fd_device);
+}
+
+#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 *func, const char *msg)
+{
+	if (drive_params[current_drive].flags & DEBUGT)
+		pr_info("%s:%s dtime=%lu\n", func, msg, jiffies - debugtimer);
+}
+#else
+static inline void set_debugt(void) { }
+static inline void debugt(const char *func, const char *msg) { }
+#endif /* DEBUGT */
+
+
+static DECLARE_DELAYED_WORK(fd_timeout, floppy_shutdown);
+static const char *timeout_message;
+
+static void is_alive(const char *func, const char *message)
+{
+	/* this routine checks whether the floppy driver is "alive" */
+	if (test_bit(0, &fdc_busy) && command_status < 2 &&
+	    !delayed_work_pending(&fd_timeout)) {
+		DPRINT("%s: timeout handler died.  %s\n", func, message);
+	}
+}
+
+static void (*do_floppy)(void) = NULL;
+
+#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;
+
+#define MAXTIMEOUT -2
+
+static void __reschedule_timeout(int drive, const char *message)
+{
+	unsigned long delay;
+
+	if (drive < 0 || drive >= N_DRIVE) {
+		delay = 20UL * HZ;
+		drive = 0;
+	} else
+		delay = drive_params[drive].timeout;
+
+	mod_delayed_work(floppy_wq, &fd_timeout, delay);
+	if (drive_params[drive].flags & FD_DEBUG)
+		DPRINT("reschedule timeout %s\n", message);
+	timeout_message = message;
+}
+
+static void reschedule_timeout(int drive, const char *message)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&floppy_lock, flags);
+	__reschedule_timeout(drive, message);
+	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);
+
+	if (time_before(jiffies, drive_state[drive].select_date + drive_params[drive].select_delay))
+		DPRINT("WARNING disk change called early\n");
+	if (!(fdc_state[fdc].dor & (0x10 << UNIT(drive))) ||
+	    (fdc_state[fdc].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)fdc_state[fdc].dor);
+	}
+
+	debug_dcl(drive_params[drive].flags,
+		  "checking disk change line for drive %d\n", drive);
+	debug_dcl(drive_params[drive].flags, "jiffies=%lu\n", jiffies);
+	debug_dcl(drive_params[drive].flags, "disk change line=%x\n",
+		  fdc_inb(fdc, FD_DIR) & 0x80);
+	debug_dcl(drive_params[drive].flags, "flags=%lx\n",
+		  drive_state[drive].flags);
+
+	if (drive_params[drive].flags & FD_BROKEN_DCL)
+		return test_bit(FD_DISK_CHANGED_BIT,
+				&drive_state[drive].flags);
+	if ((fdc_inb(fdc, FD_DIR) ^ drive_params[drive].flags) & 0x80) {
+		set_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
+					/* verify write protection */
+
+		if (drive_state[drive].maxblock)	/* mark it changed */
+			set_bit(FD_DISK_CHANGED_BIT,
+				&drive_state[drive].flags);
+
+		/* invalidate its geometry */
+		if (drive_state[drive].keep_data >= 0) {
+			if ((drive_params[drive].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;
+		}
+
+		return 1;
+	} else {
+		drive_state[drive].last_checked = jiffies;
+		clear_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[drive].flags);
+	}
+	return 0;
+}
+
+static inline int is_selected(int dor, int unit)
+{
+	return ((dor & (0x10 << unit)) && (dor & 3) == unit);
+}
+
+static bool is_ready_state(int status)
+{
+	int state = status & (STATUS_READY | STATUS_DIR | STATUS_DMA);
+	return state == STATUS_READY;
+}
+
+static int set_dor(int fdc, char mask, char data)
+{
+	unsigned char unit;
+	unsigned char drive;
+	unsigned char newdor;
+	unsigned char olddor;
+
+	if (fdc_state[fdc].address == -1)
+		return -1;
+
+	olddor = fdc_state[fdc].dor;
+	newdor = (olddor & mask) | data;
+	if (newdor != olddor) {
+		unit = olddor & 0x3;
+		if (is_selected(olddor, unit) && !is_selected(newdor, unit)) {
+			drive = REVDRIVE(fdc, unit);
+			debug_dcl(drive_params[drive].flags,
+				  "calling disk change from set_dor\n");
+			disk_change(drive);
+		}
+		fdc_state[fdc].dor = newdor;
+		fdc_outb(newdor, fdc, FD_DOR);
+
+		unit = newdor & 0x3;
+		if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
+			drive = REVDRIVE(fdc, unit);
+			drive_state[drive].select_date = jiffies;
+		}
+	}
+	return olddor;
+}
+
+static void twaddle(int fdc, int drive)
+{
+	if (drive_params[drive].select_delay)
+		return;
+	fdc_outb(fdc_state[fdc].dor & ~(0x10 << UNIT(drive)),
+		 fdc, FD_DOR);
+	fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR);
+	drive_state[drive].select_date = jiffies;
+}
+
+/*
+ * Reset all driver information about the specified fdc.
+ * This is needed after a reset, and after a raw command.
+ */
+static void reset_fdc_info(int fdc, int mode)
+{
+	int drive;
+
+	fdc_state[fdc].spec1 = fdc_state[fdc].spec2 = -1;
+	fdc_state[fdc].need_configure = 1;
+	fdc_state[fdc].perp_mode = 1;
+	fdc_state[fdc].rawcmd = 0;
+	for (drive = 0; drive < N_DRIVE; drive++)
+		if (FDC(drive) == fdc &&
+		    (mode || drive_state[drive].track != NEED_1_RECAL))
+			drive_state[drive].track = NEED_2_RECAL;
+}
+
+/*
+ * selects the fdc and drive, and enables the fdc's input/dma.
+ * Both current_drive and current_fdc are changed to match the new drive.
+ */
+static void set_fdc(int drive)
+{
+	unsigned int fdc;
+
+	if (drive < 0 || drive >= N_DRIVE) {
+		pr_info("bad drive value %d\n", drive);
+		return;
+	}
+
+	fdc = FDC(drive);
+	if (fdc >= N_FDC) {
+		pr_info("bad fdc value\n");
+		return;
+	}
+
+	set_dor(fdc, ~0, 8);
+#if N_FDC > 1
+	set_dor(1 - fdc, ~8, 0);
+#endif
+	if (fdc_state[fdc].rawcmd == 2)
+		reset_fdc_info(fdc, 1);
+	if (fdc_inb(fdc, FD_STATUS) != STATUS_READY)
+		fdc_state[fdc].reset = 1;
+
+	current_drive = drive;
+	current_fdc = fdc;
+}
+
+/*
+ * locks the driver.
+ * Both current_drive and current_fdc are changed to match the new drive.
+ */
+static int lock_fdc(int drive)
+{
+	if (WARN(atomic_read(&usage_count) == 0,
+		 "Trying to lock fdc while usage count=0\n"))
+		return -1;
+
+	if (wait_event_interruptible(fdc_wait, !test_and_set_bit(0, &fdc_busy)))
+		return -EINTR;
+
+	command_status = FD_COMMAND_NONE;
+
+	reschedule_timeout(drive, "lock fdc");
+	set_fdc(drive);
+	return 0;
+}
+
+/* unlocks the driver */
+static void unlock_fdc(void)
+{
+	if (!test_bit(0, &fdc_busy))
+		DPRINT("FDC access conflict!\n");
+
+	raw_cmd = NULL;
+	command_status = FD_COMMAND_NONE;
+	cancel_delayed_work(&fd_timeout);
+	do_floppy = NULL;
+	cont = NULL;
+	clear_bit(0, &fdc_busy);
+	wake_up(&fdc_wait);
+}
+
+/* switches the motor off after a given timeout */
+static void motor_off_callback(struct timer_list *t)
+{
+	unsigned long nr = t - motor_off_timer;
+	unsigned char mask = ~(0x10 << UNIT(nr));
+
+	if (WARN_ON_ONCE(nr >= N_DRIVE))
+		return;
+
+	set_dor(FDC(nr), mask, 0);
+}
+
+/* schedules motor off */
+static void floppy_off(unsigned int drive)
+{
+	unsigned long volatile delta;
+	int fdc = FDC(drive);
+
+	if (!(fdc_state[fdc].dor & (0x10 << UNIT(drive))))
+		return;
+
+	del_timer(motor_off_timer + drive);
+
+	/* make spindle stop in a position which minimizes spinup time
+	 * next time */
+	if (drive_params[drive].rps) {
+		delta = jiffies - drive_state[drive].first_read_date + HZ -
+		    drive_params[drive].spindown_offset;
+		delta = ((delta * drive_params[drive].rps) % HZ) / drive_params[drive].rps;
+		motor_off_timer[drive].expires =
+		    jiffies + drive_params[drive].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;
+	int drive;
+	int saved_drive;
+
+	if (drive_params[current_drive].select_delay)
+		return;
+
+	saved_drive = current_drive;
+	for (i = 0; i < N_DRIVE; i++) {
+		drive = (saved_drive + i + 1) % N_DRIVE;
+		if (drive_state[drive].fd_ref == 0 || drive_params[drive].select_delay != 0)
+			continue;	/* skip closed drives */
+		set_fdc(drive);
+		if (!(set_dor(current_fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
+		      (0x10 << UNIT(drive))))
+			/* switch the motor off again, if it was off to
+			 * begin with */
+			set_dor(current_fdc, ~(0x10 << UNIT(drive)), 0);
+	}
+	set_fdc(saved_drive);
+}
+
+static void empty(void)
+{
+}
+
+static void (*floppy_work_fn)(void);
+
+static void floppy_work_workfn(struct work_struct *work)
+{
+	floppy_work_fn();
+}
+
+static DECLARE_WORK(floppy_work, floppy_work_workfn);
+
+static void schedule_bh(void (*handler)(void))
+{
+	WARN_ON(work_pending(&floppy_work));
+
+	floppy_work_fn = handler;
+	queue_work(floppy_wq, &floppy_work);
+}
+
+static void (*fd_timer_fn)(void) = NULL;
+
+static void fd_timer_workfn(struct work_struct *work)
+{
+	fd_timer_fn();
+}
+
+static DECLARE_DELAYED_WORK(fd_timer, fd_timer_workfn);
+
+static void cancel_activity(void)
+{
+	do_floppy = NULL;
+	cancel_delayed_work(&fd_timer);
+	cancel_work_sync(&floppy_work);
+}
+
+/* this function makes sure that the disk stays in the drive during the
+ * transfer */
+static void fd_watchdog(void)
+{
+	debug_dcl(drive_params[current_drive].flags,
+		  "calling disk change from watchdog\n");
+
+	if (disk_change(current_drive)) {
+		DPRINT("disk removed during i/o\n");
+		cancel_activity();
+		cont->done(0);
+		reset_fdc();
+	} else {
+		cancel_delayed_work(&fd_timer);
+		fd_timer_fn = fd_watchdog;
+		queue_delayed_work(floppy_wq, &fd_timer, HZ / 10);
+	}
+}
+
+static void main_command_interrupt(void)
+{
+	cancel_delayed_work(&fd_timer);
+	cont->interrupt();
+}
+
+/* waits for a delay (spinup or select) to pass */
+static int fd_wait_for_completion(unsigned long expires,
+				  void (*function)(void))
+{
+	if (fdc_state[current_fdc].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 (time_before(jiffies, expires)) {
+		cancel_delayed_work(&fd_timer);
+		fd_timer_fn = function;
+		queue_delayed_work(floppy_wq, &fd_timer, expires - jiffies);
+		return 1;
+	}
+	return 0;
+}
+
+static void setup_DMA(void)
+{
+	unsigned long f;
+
+	if (raw_cmd->length == 0) {
+		print_hex_dump(KERN_INFO, "zero dma transfer size: ",
+			       DUMP_PREFIX_NONE, 16, 1,
+			       raw_cmd->fullcmd, raw_cmd->cmd_count, false);
+		cont->done(0);
+		fdc_state[current_fdc].reset = 1;
+		return;
+	}
+	if (((unsigned long)raw_cmd->kernel_data) % 512) {
+		pr_info("non aligned address: %p\n", raw_cmd->kernel_data);
+		cont->done(0);
+		fdc_state[current_fdc].reset = 1;
+		return;
+	}
+	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,
+			 fdc_state[current_fdc].address) < 0) {
+		release_dma_lock(f);
+		cont->done(0);
+		fdc_state[current_fdc].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 = fdc_state[current_fdc].address;
+	fd_enable_dma();
+	release_dma_lock(f);
+#endif
+}
+
+static void show_floppy(int fdc);
+
+/* waits until the fdc becomes ready */
+static int wait_til_ready(int fdc)
+{
+	int status;
+	int counter;
+
+	if (fdc_state[fdc].reset)
+		return -1;
+	for (counter = 0; counter < 10000; counter++) {
+		status = fdc_inb(fdc, FD_STATUS);
+		if (status & STATUS_READY)
+			return status;
+	}
+	if (initialized) {
+		DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
+		show_floppy(fdc);
+	}
+	fdc_state[fdc].reset = 1;
+	return -1;
+}
+
+/* sends a command byte to the fdc */
+static int output_byte(int fdc, char byte)
+{
+	int status = wait_til_ready(fdc);
+
+	if (status < 0)
+		return -1;
+
+	if (is_ready_state(status)) {
+		fdc_outb(byte, fdc, FD_DATA);
+		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;
+		return 0;
+	}
+	fdc_state[fdc].reset = 1;
+	if (initialized) {
+		DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
+		       byte, fdc, status);
+		show_floppy(fdc);
+	}
+	return -1;
+}
+
+/* gets the response from the fdc */
+static int result(int fdc)
+{
+	int i;
+	int status = 0;
+
+	for (i = 0; i < FD_RAW_REPLY_SIZE; i++) {
+		status = wait_til_ready(fdc);
+		if (status < 0)
+			break;
+		status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
+		if ((status & ~STATUS_BUSY) == STATUS_READY) {
+			resultjiffies = jiffies;
+			resultsize = i;
+			return i;
+		}
+		if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
+			reply_buffer[i] = fdc_inb(fdc, FD_DATA);
+		else
+			break;
+	}
+	if (initialized) {
+		DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
+		       fdc, status, i);
+		show_floppy(fdc);
+	}
+	fdc_state[fdc].reset = 1;
+	return -1;
+}
+
+#define MORE_OUTPUT -2
+/* does the fdc need more output? */
+static int need_more_output(int fdc)
+{
+	int status = wait_til_ready(fdc);
+
+	if (status < 0)
+		return -1;
+
+	if (is_ready_state(status))
+		return MORE_OUTPUT;
+
+	return result(fdc);
+}
+
+/* Set perpendicular mode as required, based on data rate, if supported.
+ * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
+ */
+static void perpendicular_mode(int fdc)
+{
+	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);
+			fdc_state[fdc].reset = 1;
+					/*
+					 * convenient way to return to
+					 * redo without too much hassle
+					 * (deep stack et al.)
+					 */
+			return;
+		}
+	} else
+		perp_mode = 0;
+
+	if (fdc_state[fdc].perp_mode == perp_mode)
+		return;
+	if (fdc_state[fdc].version >= FDC_82077_ORIG) {
+		output_byte(fdc, FD_PERPENDICULAR);
+		output_byte(fdc, perp_mode);
+		fdc_state[fdc].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(int fdc)
+{
+	/* Turn on FIFO */
+	output_byte(fdc, FD_CONFIGURE);
+	if (need_more_output(fdc) != MORE_OUTPUT)
+		return 0;
+	output_byte(fdc, 0);
+	output_byte(fdc, 0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
+	output_byte(fdc, 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(int fdc, int drive)
+{
+	unsigned char spec1;
+	unsigned char spec2;
+	unsigned long srt;
+	unsigned long hlt;
+	unsigned long hut;
+	unsigned long dtr = NOMINAL_DTR;
+	unsigned long scale_dtr = NOMINAL_DTR;
+	int hlt_max_code = 0x7f;
+	int hut_max_code = 0xf;
+
+	if (fdc_state[fdc].need_configure &&
+	    fdc_state[fdc].version >= FDC_82072A) {
+		fdc_configure(fdc);
+		fdc_state[fdc].need_configure = 0;
+	}
+
+	switch (raw_cmd->rate & 0x03) {
+	case 3:
+		dtr = 1000;
+		break;
+	case 1:
+		dtr = 300;
+		if (fdc_state[fdc].version >= FDC_82078) {
+			/* chose the default rate table, not the one
+			 * where 1 = 2 Mbps */
+			output_byte(fdc, FD_DRIVESPEC);
+			if (need_more_output(fdc) == MORE_OUTPUT) {
+				output_byte(fdc, UNIT(drive));
+				output_byte(fdc, 0xc0);
+			}
+		}
+		break;
+	case 2:
+		dtr = 250;
+		break;
+	}
+
+	if (fdc_state[fdc].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 - DIV_ROUND_UP(drive_params[drive].srt * scale_dtr / 1000,
+				NOMINAL_DTR);
+	if (slow_floppy)
+		srt = srt / 4;
+
+	SUPBOUND(srt, 0xf);
+	INFBOUND(srt, 0);
+
+	hlt = DIV_ROUND_UP(drive_params[drive].hlt * scale_dtr / 2,
+			   NOMINAL_DTR);
+	if (hlt < 0x01)
+		hlt = 0x01;
+	else if (hlt > 0x7f)
+		hlt = hlt_max_code;
+
+	hut = DIV_ROUND_UP(drive_params[drive].hut * scale_dtr / 16,
+			   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 (fdc_state[fdc].spec1 != spec1 ||
+	    fdc_state[fdc].spec2 != spec2) {
+		/* Go ahead and set spec1 and spec2 */
+		output_byte(fdc, FD_SPECIFY);
+		output_byte(fdc, fdc_state[fdc].spec1 = spec1);
+		output_byte(fdc, fdc_state[fdc].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) == fdc_state[current_fdc].dtr)
+		return 0;
+
+	/* Set dtr */
+	fdc_outb(raw_cmd->rate & 3, current_fdc, 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)
+	 */
+	fdc_state[current_fdc].dtr = raw_cmd->rate & 3;
+	return fd_wait_for_completion(jiffies + 2UL * HZ / 100, floppy_ready);
+}				/* fdc_dtr */
+
+static void tell_sector(void)
+{
+	pr_cont(": track %d, head %d, sector %d, size %d",
+		reply_buffer[R_TRACK], reply_buffer[R_HEAD],
+		reply_buffer[R_SECTOR],
+		reply_buffer[R_SIZECODE]);
+}				/* tell_sector */
+
+static void print_errors(void)
+{
+	DPRINT("");
+	if (reply_buffer[ST0] & ST0_ECE) {
+		pr_cont("Recalibrate failed!");
+	} else if (reply_buffer[ST2] & ST2_CRC) {
+		pr_cont("data CRC error");
+		tell_sector();
+	} else if (reply_buffer[ST1] & ST1_CRC) {
+		pr_cont("CRC error");
+		tell_sector();
+	} else if ((reply_buffer[ST1] & (ST1_MAM | ST1_ND)) ||
+		   (reply_buffer[ST2] & ST2_MAM)) {
+		if (!probing) {
+			pr_cont("sector not found");
+			tell_sector();
+		} else
+			pr_cont("probe failed...");
+	} else if (reply_buffer[ST2] & ST2_WC) {	/* seek error */
+		pr_cont("wrong cylinder");
+	} else if (reply_buffer[ST2] & ST2_BC) {	/* cylinder marked as bad */
+		pr_cont("bad cylinder");
+	} else {
+		pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
+			reply_buffer[ST0], reply_buffer[ST1],
+			reply_buffer[ST2]);
+		tell_sector();
+	}
+	pr_cont("\n");
+}
+
+/*
+ * 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\n");
+		fdc_state[current_fdc].reset = 1;
+		return 1;
+	}
+
+	/* check IC to find cause of interrupt */
+	switch (reply_buffer[ST0] & ST0_INTR) {
+	case 0x40:		/* error occurred during command execution */
+		if (reply_buffer[ST1] & ST1_EOC)
+			return 0;	/* occurs with pseudo-DMA */
+		bad = 1;
+		if (reply_buffer[ST1] & ST1_WP) {
+			DPRINT("Drive is write protected\n");
+			clear_bit(FD_DISK_WRITABLE_BIT,
+				  &drive_state[current_drive].flags);
+			cont->done(0);
+			bad = 2;
+		} else if (reply_buffer[ST1] & ST1_ND) {
+			set_bit(FD_NEED_TWADDLE_BIT,
+				&drive_state[current_drive].flags);
+		} else if (reply_buffer[ST1] & ST1_OR) {
+			if (drive_params[current_drive].flags & FTD_MSG)
+				DPRINT("Over/Underrun - retrying\n");
+			bad = 0;
+		} else if (floppy_errors >= drive_params[current_drive].max_errors.reporting) {
+			print_errors();
+		}
+		if (reply_buffer[ST2] & ST2_WC || reply_buffer[ST2] & ST2_BC)
+			/* wrong cylinder => recal */
+			drive_state[current_drive].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;
+	int r;
+	int flags;
+	unsigned long ready_date;
+	void (*function)(void);
+
+	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 = drive_state[current_drive].spinup_date + drive_params[current_drive].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 (time_after(ready_date, jiffies + drive_params[current_drive].select_delay)) {
+			ready_date -= drive_params[current_drive].select_delay;
+			function = floppy_start;
+		} else
+			function = setup_rw_floppy;
+
+		/* wait until the floppy is spinning fast enough */
+		if (fd_wait_for_completion(ready_date, function))
+			return;
+	}
+	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(current_fdc, raw_cmd->fullcmd[i]);
+
+	debugt(__func__, "rw_command");
+
+	if (r) {
+		cont->error();
+		reset_fdc();
+		return;
+	}
+
+	if (!(flags & FD_RAW_INTR)) {
+		inr = result(current_fdc);
+		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(__func__, "");
+	if (inr != 2 || (reply_buffer[ST0] & 0xF8) != 0x20) {
+		DPRINT("seek failed\n");
+		drive_state[current_drive].track = NEED_2_RECAL;
+		cont->error();
+		cont->redo();
+		return;
+	}
+	if (drive_state[current_drive].track >= 0 &&
+	    drive_state[current_drive].track != reply_buffer[ST1] &&
+	    !blind_seek) {
+		debug_dcl(drive_params[current_drive].flags,
+			  "clearing NEWCHANGE flag because of effective seek\n");
+		debug_dcl(drive_params[current_drive].flags, "jiffies=%lu\n",
+			  jiffies);
+		clear_bit(FD_DISK_NEWCHANGE_BIT,
+			  &drive_state[current_drive].flags);
+					/* effective seek */
+		drive_state[current_drive].select_date = jiffies;
+	}
+	drive_state[current_drive].track = reply_buffer[ST1];
+	floppy_ready();
+}
+
+static void check_wp(int fdc, int drive)
+{
+	if (test_bit(FD_VERIFY_BIT, &drive_state[drive].flags)) {
+					/* check write protection */
+		output_byte(fdc, FD_GETSTATUS);
+		output_byte(fdc, UNIT(drive));
+		if (result(fdc) != 1) {
+			fdc_state[fdc].reset = 1;
+			return;
+		}
+		clear_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
+		clear_bit(FD_NEED_TWADDLE_BIT,
+			  &drive_state[drive].flags);
+		debug_dcl(drive_params[drive].flags,
+			  "checking whether disk is write protected\n");
+		debug_dcl(drive_params[drive].flags, "wp=%x\n",
+			  reply_buffer[ST3] & 0x40);
+		if (!(reply_buffer[ST3] & 0x40))
+			set_bit(FD_DISK_WRITABLE_BIT,
+				&drive_state[drive].flags);
+		else
+			clear_bit(FD_DISK_WRITABLE_BIT,
+				  &drive_state[drive].flags);
+	}
+}
+
+static void seek_floppy(void)
+{
+	int track;
+
+	blind_seek = 0;
+
+	debug_dcl(drive_params[current_drive].flags,
+		  "calling disk change from %s\n", __func__);
+
+	if (!test_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags) &&
+	    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.
+		 */
+		set_bit(FD_DISK_CHANGED_BIT,
+			&drive_state[current_drive].flags);
+		cont->done(0);
+		cont->redo();
+		return;
+	}
+	if (drive_state[current_drive].track <= NEED_1_RECAL) {
+		recalibrate_floppy();
+		return;
+	} else if (test_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags) &&
+		   (raw_cmd->flags & FD_RAW_NEED_DISK) &&
+		   (drive_state[current_drive].track <= NO_TRACK || drive_state[current_drive].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 (drive_params[current_drive].flags & FD_SILENT_DCL_CLEAR) {
+				set_dor(current_fdc, ~(0x10 << UNIT(current_drive)), 0);
+				blind_seek = 1;
+				raw_cmd->flags |= FD_RAW_NEED_SEEK;
+			}
+			track = 1;
+		}
+	} else {
+		check_wp(current_fdc, current_drive);
+		if (raw_cmd->track != drive_state[current_drive].track &&
+		    (raw_cmd->flags & FD_RAW_NEED_SEEK))
+			track = raw_cmd->track;
+		else {
+			setup_rw_floppy();
+			return;
+		}
+	}
+
+	do_floppy = seek_interrupt;
+	output_byte(current_fdc, FD_SEEK);
+	output_byte(current_fdc, UNIT(current_drive));
+	if (output_byte(current_fdc, track) < 0) {
+		reset_fdc();
+		return;
+	}
+	debugt(__func__, "");
+}
+
+static void recal_interrupt(void)
+{
+	debugt(__func__, "");
+	if (inr != 2)
+		fdc_state[current_fdc].reset = 1;
+	else if (reply_buffer[ST0] & ST0_ECE) {
+		switch (drive_state[current_drive].track) {
+		case NEED_1_RECAL:
+			debugt(__func__, "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(__func__, "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 */
+			debug_dcl(drive_params[current_drive].flags,
+				  "clearing NEWCHANGE flag because of second recalibrate\n");
+
+			clear_bit(FD_DISK_NEWCHANGE_BIT,
+				  &drive_state[current_drive].flags);
+			drive_state[current_drive].select_date = jiffies;
+			fallthrough;
+		default:
+			debugt(__func__, "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.  */
+			drive_state[current_drive].track = NEED_1_RECAL;
+			break;
+		}
+	} else
+		drive_state[current_drive].track = reply_buffer[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++)
+			pr_cont("repl[%d]=%x ", i, reply_buffer[i]);
+	pr_cont("\n");
+}
+
+/* interrupt handler. Note that this can be called externally on the Sparc */
+irqreturn_t floppy_interrupt(int irq, void *dev_id)
+{
+	int do_print;
+	unsigned long f;
+	void (*handler)(void) = do_floppy;
+
+	lasthandler = handler;
+	interruptjiffies = jiffies;
+
+	f = claim_dma_lock();
+	fd_disable_dma();
+	release_dma_lock(f);
+
+	do_floppy = NULL;
+	if (current_fdc >= N_FDC || fdc_state[current_fdc].address == -1) {
+		/* we don't even know which FDC is the culprit */
+		pr_info("DOR0=%x\n", fdc_state[0].dor);
+		pr_info("floppy interrupt on bizarre fdc %d\n", current_fdc);
+		pr_info("handler=%ps\n", handler);
+		is_alive(__func__, "bizarre fdc");
+		return IRQ_NONE;
+	}
+
+	fdc_state[current_fdc].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 fdc_state[fdc].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 && initialized;
+
+	inr = result(current_fdc);
+	if (do_print)
+		print_result("unexpected interrupt", inr);
+	if (inr == 0) {
+		int max_sensei = 4;
+		do {
+			output_byte(current_fdc, FD_SENSEI);
+			inr = result(current_fdc);
+			if (do_print)
+				print_result("sensei", inr);
+			max_sensei--;
+		} while ((reply_buffer[ST0] & 0x83) != UNIT(current_drive) &&
+			 inr == 2 && max_sensei);
+	}
+	if (!handler) {
+		fdc_state[current_fdc].reset = 1;
+		return IRQ_NONE;
+	}
+	schedule_bh(handler);
+	is_alive(__func__, "normal interrupt end");
+
+	/* FIXME! Was it really for us? */
+	return IRQ_HANDLED;
+}
+
+static void recalibrate_floppy(void)
+{
+	debugt(__func__, "");
+	do_floppy = recal_interrupt;
+	output_byte(current_fdc, FD_RECALIBRATE);
+	if (output_byte(current_fdc, UNIT(current_drive)) < 0)
+		reset_fdc();
+}
+
+/*
+ * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
+ */
+static void reset_interrupt(void)
+{
+	debugt(__func__, "");
+	result(current_fdc);		/* get the status ready for set_fdc */
+	if (fdc_state[current_fdc].reset) {
+		pr_info("reset set in interrupt, calling %ps\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).
+ * This WILL trigger an interrupt, causing the handlers in the current
+ * cont's ->redo() to be called via reset_interrupt().
+ */
+static void reset_fdc(void)
+{
+	unsigned long flags;
+
+	do_floppy = reset_interrupt;
+	fdc_state[current_fdc].reset = 0;
+	reset_fdc_info(current_fdc, 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 (fdc_state[current_fdc].version >= FDC_82072A)
+		fdc_outb(0x80 | (fdc_state[current_fdc].dtr & 3),
+			 current_fdc, FD_STATUS);
+	else {
+		fdc_outb(fdc_state[current_fdc].dor & ~0x04, current_fdc, FD_DOR);
+		udelay(FD_RESET_DELAY);
+		fdc_outb(fdc_state[current_fdc].dor, current_fdc, FD_DOR);
+	}
+}
+
+static void show_floppy(int fdc)
+{
+	int i;
+
+	pr_info("\n");
+	pr_info("floppy driver state\n");
+	pr_info("-------------------\n");
+	pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%ps\n",
+		jiffies, interruptjiffies, jiffies - interruptjiffies,
+		lasthandler);
+
+	pr_info("timeout_message=%s\n", timeout_message);
+	pr_info("last output bytes:\n");
+	for (i = 0; i < OLOGSIZE; i++)
+		pr_info("%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);
+	pr_info("last result at %lu\n", resultjiffies);
+	pr_info("last redo_fd_request at %lu\n", lastredo);
+	print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1,
+		       reply_buffer, resultsize, true);
+
+	pr_info("status=%x\n", fdc_inb(fdc, FD_STATUS));
+	pr_info("fdc_busy=%lu\n", fdc_busy);
+	if (do_floppy)
+		pr_info("do_floppy=%ps\n", do_floppy);
+	if (work_pending(&floppy_work))
+		pr_info("floppy_work.func=%ps\n", floppy_work.func);
+	if (delayed_work_pending(&fd_timer))
+		pr_info("delayed work.function=%p expires=%ld\n",
+		       fd_timer.work.func,
+		       fd_timer.timer.expires - jiffies);
+	if (delayed_work_pending(&fd_timeout))
+		pr_info("timer_function=%p expires=%ld\n",
+		       fd_timeout.work.func,
+		       fd_timeout.timer.expires - jiffies);
+
+	pr_info("cont=%p\n", cont);
+	pr_info("current_req=%p\n", current_req);
+	pr_info("command_status=%d\n", command_status);
+	pr_info("\n");
+}
+
+static void floppy_shutdown(struct work_struct *arg)
+{
+	unsigned long flags;
+
+	if (initialized)
+		show_floppy(current_fdc);
+	cancel_activity();
+
+	flags = claim_dma_lock();
+	fd_disable_dma();
+	release_dma_lock(flags);
+
+	/* avoid dma going to a random drive after shutdown */
+
+	if (initialized)
+		DPRINT("floppy timeout called\n");
+	fdc_state[current_fdc].reset = 1;
+	if (cont) {
+		cont->done(0);
+		cont->redo();	/* this will recall reset when needed */
+	} else {
+		pr_info("no cont in shutdown!\n");
+		process_fd_request();
+	}
+	is_alive(__func__, "");
+}
+
+/* start motor, check media-changed condition and write protection */
+static int start_motor(void (*function)(void))
+{
+	int mask;
+	int data;
+
+	mask = 0xfc;
+	data = UNIT(current_drive);
+	if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
+		if (!(fdc_state[current_fdc].dor & (0x10 << UNIT(current_drive)))) {
+			set_debugt();
+			/* no read since this drive is running */
+			drive_state[current_drive].first_read_date = 0;
+			/* note motor start time if motor is not yet running */
+			drive_state[current_drive].spinup_date = jiffies;
+			data |= (0x10 << UNIT(current_drive));
+		}
+	} else if (fdc_state[current_fdc].dor & (0x10 << UNIT(current_drive)))
+		mask &= ~(0x10 << UNIT(current_drive));
+
+	/* starts motor and selects floppy */
+	del_timer(motor_off_timer + current_drive);
+	set_dor(current_fdc, mask, data);
+
+	/* wait_for_completion also schedules reset if needed. */
+	return fd_wait_for_completion(drive_state[current_drive].select_date + drive_params[current_drive].select_delay,
+				      function);
+}
+
+static void floppy_ready(void)
+{
+	if (fdc_state[current_fdc].reset) {
+		reset_fdc();
+		return;
+	}
+	if (start_motor(floppy_ready))
+		return;
+	if (fdc_dtr())
+		return;
+
+	debug_dcl(drive_params[current_drive].flags,
+		  "calling disk change from floppy_ready\n");
+	if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
+	    disk_change(current_drive) && !drive_params[current_drive].select_delay)
+		twaddle(current_fdc, current_drive);	/* 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(current_fdc);
+		fdc_specify(current_fdc, current_drive); /* 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(current_fdc, current_drive);
+		setup_rw_floppy();
+	}
+}
+
+static void floppy_start(void)
+{
+	reschedule_timeout(current_drive, "floppy start");
+
+	scandrives();
+	debug_dcl(drive_params[current_drive].flags,
+		  "setting NEWCHANGE in floppy_start\n");
+	set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags);
+	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");
+	cont = NULL;
+	command_status += 2;
+	wake_up(&command_done);
+}
+
+static const struct cont_t wakeup_cont = {
+	.interrupt	= empty,
+	.redo		= do_wakeup,
+	.error		= empty,
+	.done		= (done_f)empty
+};
+
+static const struct cont_t intr_cont = {
+	.interrupt	= empty,
+	.redo		= process_fd_request,
+	.error		= empty,
+	.done		= (done_f)empty
+};
+
+/* schedules handler, waiting for completion. May be interrupted, will then
+ * return -EINTR, in which case the driver will automatically be unlocked.
+ */
+static int wait_til_done(void (*handler)(void), bool interruptible)
+{
+	int ret;
+
+	schedule_bh(handler);
+
+	if (interruptible)
+		wait_event_interruptible(command_done, command_status >= 2);
+	else
+		wait_event(command_done, command_status >= 2);
+
+	if (command_status < 2) {
+		cancel_activity();
+		cont = &intr_cont;
+		reset_fdc();
+		return -EINTR;
+	}
+
+	if (fdc_state[current_fdc].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(int drive)
+{
+	int probed_format;
+
+	probed_format = drive_state[drive].probed_format;
+	while (1) {
+		if (probed_format >= FD_AUTODETECT_SIZE ||
+		    !drive_params[drive].autodetect[probed_format]) {
+			drive_state[drive].probed_format = 0;
+			return 1;
+		}
+		if (floppy_type[drive_params[drive].autodetect[probed_format]].sect) {
+			drive_state[drive].probed_format = probed_format;
+			return 0;
+		}
+		probed_format++;
+	}
+}
+
+static void bad_flp_intr(void)
+{
+	int err_count;
+
+	if (probing) {
+		drive_state[current_drive].probed_format++;
+		if (!next_valid_format(current_drive))
+			return;
+	}
+	err_count = ++floppy_errors;
+	INFBOUND(write_errors[current_drive].badness, err_count);
+	if (err_count > drive_params[current_drive].max_errors.abort)
+		cont->done(0);
+	if (err_count > drive_params[current_drive].max_errors.reset)
+		fdc_state[current_fdc].reset = 1;
+	else if (err_count > drive_params[current_drive].max_errors.recal)
+		drive_state[current_drive].track = NEED_2_RECAL;
+}
+
+static void set_floppy(int drive)
+{
+	int type = ITYPE(drive_state[drive].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();
+		break;
+	case 2:
+		break;
+	case 0:
+		cont->done(1);
+	}
+	cont->redo();
+}
+
+#define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1))
+#define CT(x) ((x) | 0xc0)
+
+static void setup_format_params(int track)
+{
+	int n;
+	int il;
+	int count;
+	int head_shift;
+	int track_shift;
+	struct fparm {
+		unsigned char track, head, sect, size;
+	} *here = (struct fparm *)floppy_track_buffer;
+
+	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;
+	raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_FORMAT);
+	raw_cmd->cmd[DR_SELECT] = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
+	raw_cmd->cmd[F_SIZECODE] = FD_SIZECODE(_floppy);
+	raw_cmd->cmd[F_SECT_PER_TRACK] = _floppy->sect << 2 >> raw_cmd->cmd[F_SIZECODE];
+	raw_cmd->cmd[F_GAP] = _floppy->fmt_gap;
+	raw_cmd->cmd[F_FILL] = FD_FILL_BYTE;
+
+	raw_cmd->kernel_data = floppy_track_buffer;
+	raw_cmd->length = 4 * raw_cmd->cmd[F_SECT_PER_TRACK];
+
+	if (!raw_cmd->cmd[F_SECT_PER_TRACK])
+		return;
+
+	/* allow for about 30ms for data transport per track */
+	head_shift = (raw_cmd->cmd[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)
+	    % raw_cmd->cmd[F_SECT_PER_TRACK];
+
+	/* determine interleave */
+	il = 1;
+	if (_floppy->fmt_gap < 0x22)
+		il++;
+
+	/* initialize field */
+	for (count = 0; count < raw_cmd->cmd[F_SECT_PER_TRACK]; ++count) {
+		here[count].track = format_req.track;
+		here[count].head = format_req.head;
+		here[count].sect = 0;
+		here[count].size = raw_cmd->cmd[F_SIZECODE];
+	}
+	/* place logical sectors */
+	for (count = 1; count <= raw_cmd->cmd[F_SECT_PER_TRACK]; ++count) {
+		here[n].sect = count;
+		n = (n + il) % raw_cmd->cmd[F_SECT_PER_TRACK];
+		if (here[n].sect) {	/* sector busy, find next free sector */
+			++n;
+			if (n >= raw_cmd->cmd[F_SECT_PER_TRACK]) {
+				n -= raw_cmd->cmd[F_SECT_PER_TRACK];
+				while (here[n].sect)
+					++n;
+			}
+		}
+	}
+	if (_floppy->stretch & FD_SECTBASEMASK) {
+		for (count = 0; count < raw_cmd->cmd[F_SECT_PER_TRACK]; count++)
+			here[count].sect += FD_SECTBASE(_floppy) - 1;
+	}
+}
+
+static void redo_format(void)
+{
+	buffer_track = -1;
+	setup_format_params(format_req.track << STRETCH(_floppy));
+	floppy_start();
+	debugt(__func__, "queue format request");
+}
+
+static const 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;
+
+	if (lock_fdc(drive))
+		return -EINTR;
+
+	set_floppy(drive);
+	if (!_floppy ||
+	    _floppy->track > drive_params[current_drive].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;
+	cont = &format_cont;
+	floppy_errors = 0;
+	ret = wait_til_done(redo_format, true);
+	if (ret == -EINTR)
+		return -EINTR;
+	process_fd_request();
+	return ret;
+}
+
+/*
+ * Buffer read/write and support
+ * =============================
+ */
+
+static void floppy_end_request(struct request *req, blk_status_t error)
+{
+	unsigned int nr_sectors = current_count_sectors;
+	unsigned int drive = (unsigned long)req->q->disk->private_data;
+
+	/* current_count_sectors can be zero if transfer failed */
+	if (error)
+		nr_sectors = blk_rq_cur_sectors(req);
+	if (blk_update_request(req, error, nr_sectors << 9))
+		return;
+	__blk_mq_end_request(req, error);
+
+	/* We're done with the request */
+	floppy_off(drive);
+	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 *req = current_req;
+	int block;
+	char msg[sizeof("request done ") + sizeof(int) * 3];
+
+	probing = 0;
+	snprintf(msg, sizeof(msg), "request done %d", uptodate);
+	reschedule_timeout(MAXTIMEOUT, msg);
+
+	if (!req) {
+		pr_info("floppy.c: no request in request_done\n");
+		return;
+	}
+
+	if (uptodate) {
+		/* maintain values for invalidation on geometry
+		 * change */
+		block = current_count_sectors + blk_rq_pos(req);
+		INFBOUND(drive_state[current_drive].maxblock, block);
+		if (block > _floppy->sect)
+			drive_state[current_drive].maxtrack = 1;
+
+		floppy_end_request(req, 0);
+	} else {
+		if (rq_data_dir(req) == WRITE) {
+			/* record write error information */
+			write_errors[current_drive].write_errors++;
+			if (write_errors[current_drive].write_errors == 1) {
+				write_errors[current_drive].first_error_sector = blk_rq_pos(req);
+				write_errors[current_drive].first_error_generation = drive_state[current_drive].generation;
+			}
+			write_errors[current_drive].last_error_sector = blk_rq_pos(req);
+			write_errors[current_drive].last_error_generation = drive_state[current_drive].generation;
+		}
+		floppy_end_request(req, BLK_STS_IOERR);
+	}
+}
+
+/* Interrupt handler evaluating the result of the r/w operation */
+static void rw_interrupt(void)
+{
+	int eoc;
+	int ssize;
+	int heads;
+	int nr_sectors;
+
+	if (reply_buffer[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 (!drive_state[current_drive].first_read_date)
+		drive_state[current_drive].first_read_date = jiffies;
+
+	ssize = DIV_ROUND_UP(1 << raw_cmd->cmd[SIZECODE], 4);
+
+	if (reply_buffer[ST1] & ST1_EOC)
+		eoc = 1;
+	else
+		eoc = 0;
+
+	if (raw_cmd->cmd[COMMAND] & 0x80)
+		heads = 2;
+	else
+		heads = 1;
+
+	nr_sectors = (((reply_buffer[R_TRACK] - raw_cmd->cmd[TRACK]) * heads +
+		       reply_buffer[R_HEAD] - raw_cmd->cmd[HEAD]) * raw_cmd->cmd[SECT_PER_TRACK] +
+		      reply_buffer[R_SECTOR] - raw_cmd->cmd[SECTOR] + eoc) << raw_cmd->cmd[SIZECODE] >> 2;
+
+	if (nr_sectors / ssize >
+	    DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
+		DPRINT("long rw: %x instead of %lx\n",
+		       nr_sectors, current_count_sectors);
+		pr_info("rs=%d s=%d\n", reply_buffer[R_SECTOR],
+			raw_cmd->cmd[SECTOR]);
+		pr_info("rh=%d h=%d\n", reply_buffer[R_HEAD],
+			raw_cmd->cmd[HEAD]);
+		pr_info("rt=%d t=%d\n", reply_buffer[R_TRACK],
+			raw_cmd->cmd[TRACK]);
+		pr_info("heads=%d eoc=%d\n", heads, eoc);
+		pr_info("spt=%d st=%d ss=%d\n",
+			raw_cmd->cmd[SECT_PER_TRACK], fsector_t, ssize);
+		pr_info("in_sector_offset=%d\n", in_sector_offset);
+	}
+
+	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 (drive_params[current_drive].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(raw_cmd->cmd[COMMAND]) != FD_READ) {
+		/* transfer directly from buffer */
+		cont->done(1);
+	} else {
+		buffer_track = raw_cmd->track;
+		buffer_drive = current_drive;
+		INFBOUND(buffer_max, nr_sectors + fsector_t);
+	}
+	cont->redo();
+}
+
+/* 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;
+	char *dma_buffer;
+	int size;
+	struct req_iterator iter;
+
+	max_sector = transfer_size(ssize,
+				   min(max_sector, max_sector_2),
+				   blk_rq_sectors(current_req));
+
+	if (current_count_sectors <= 0 && CT(raw_cmd->cmd[COMMAND]) == FD_WRITE &&
+	    buffer_max > fsector_t + blk_rq_sectors(current_req))
+		current_count_sectors = min_t(int, buffer_max - fsector_t,
+					      blk_rq_sectors(current_req));
+
+	remaining = current_count_sectors << 9;
+	if (remaining > blk_rq_bytes(current_req) && CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) {
+		DPRINT("in copy buffer\n");
+		pr_info("current_count_sectors=%ld\n", current_count_sectors);
+		pr_info("remaining=%d\n", remaining >> 9);
+		pr_info("current_req->nr_sectors=%u\n",
+			blk_rq_sectors(current_req));
+		pr_info("current_req->current_nr_sectors=%u\n",
+			blk_rq_cur_sectors(current_req));
+		pr_info("max_sector=%d\n", max_sector);
+		pr_info("ssize=%d\n", ssize);
+	}
+
+	buffer_max = max(max_sector, buffer_max);
+
+	dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
+
+	size = blk_rq_cur_bytes(current_req);
+
+	rq_for_each_segment(bv, current_req, iter) {
+		if (!remaining)
+			break;
+
+		size = bv.bv_len;
+		SUPBOUND(size, remaining);
+		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));
+			pr_info("fsector_t=%d buffer_min=%d\n",
+				fsector_t, buffer_min);
+			pr_info("current_count_sectors=%ld\n",
+				current_count_sectors);
+			if (CT(raw_cmd->cmd[COMMAND]) == FD_READ)
+				pr_info("read\n");
+			if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE)
+				pr_info("write\n");
+			break;
+		}
+
+		if (CT(raw_cmd->cmd[COMMAND]) == FD_READ)
+			memcpy_to_bvec(&bv, dma_buffer);
+		else
+			memcpy_from_bvec(dma_buffer, &bv);
+
+		remaining -= size;
+		dma_buffer += size;
+	}
+	if (remaining) {
+		if (remaining > 0)
+			max_sector -= remaining >> 9;
+		DPRINT("weirdness: remaining %d\n", remaining >> 9);
+	}
+}
+
+/* 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 raw_cmd->cmd[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;
+	int end_sector;
+
+	if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) {
+		raw_cmd->cmd[COMMAND] &= ~0x80;	/* switch off multiple track mode */
+
+		hard_sectors = raw_cmd->length >> (7 + raw_cmd->cmd[SIZECODE]);
+		end_sector = raw_cmd->cmd[SECTOR] + hard_sectors - 1;
+		if (end_sector > raw_cmd->cmd[SECT_PER_TRACK]) {
+			pr_info("too many sectors %d > %d\n",
+				end_sector, raw_cmd->cmd[SECT_PER_TRACK]);
+			return;
+		}
+		raw_cmd->cmd[SECT_PER_TRACK] = end_sector;
+					/* make sure raw_cmd->cmd[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;
+	int max_size;
+	int tracksize;
+	int ssize;
+
+	if (WARN(max_buffer_sectors == 0, "VFS: Block I/O scheduled on unopened device\n"))
+		return 0;
+
+	set_fdc((long)current_req->q->disk->private_data);
+
+	raw_cmd = &default_raw_cmd;
+	raw_cmd->flags = FD_RAW_SPIN | 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;
+		raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_READ);
+	} else if (rq_data_dir(current_req) == WRITE) {
+		raw_cmd->flags |= FD_RAW_WRITE;
+		raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_WRITE);
+	} else {
+		DPRINT("%s: unknown command\n", __func__);
+		return 0;
+	}
+
+	max_sector = _floppy->sect * _floppy->head;
+
+	raw_cmd->cmd[TRACK] = (int)blk_rq_pos(current_req) / max_sector;
+	fsector_t = (int)blk_rq_pos(current_req) % max_sector;
+	if (_floppy->track && raw_cmd->cmd[TRACK] >= _floppy->track) {
+		if (blk_rq_cur_sectors(current_req) & 1) {
+			current_count_sectors = 1;
+			return 1;
+		} else
+			return 0;
+	}
+	raw_cmd->cmd[HEAD] = fsector_t / _floppy->sect;
+
+	if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
+	     test_bit(FD_NEED_TWADDLE_BIT, &drive_state[current_drive].flags)) &&
+	    fsector_t < _floppy->sect)
+		max_sector = _floppy->sect;
+
+	/* 2M disks have phantom sectors on the first track */
+	if ((_floppy->rate & FD_2M) && (!raw_cmd->cmd[TRACK]) && (!raw_cmd->cmd[HEAD])) {
+		max_sector = 2 * _floppy->sect / 3;
+		if (fsector_t >= max_sector) {
+			current_count_sectors =
+			    min_t(int, _floppy->sect - fsector_t,
+				  blk_rq_sectors(current_req));
+			return 1;
+		}
+		raw_cmd->cmd[SIZECODE] = 2;
+	} else
+		raw_cmd->cmd[SIZECODE] = FD_SIZECODE(_floppy);
+	raw_cmd->rate = _floppy->rate & 0x43;
+	if ((_floppy->rate & FD_2M) &&
+	    (raw_cmd->cmd[TRACK] || raw_cmd->cmd[HEAD]) && raw_cmd->rate == 2)
+		raw_cmd->rate = 1;
+
+	if (raw_cmd->cmd[SIZECODE])
+		raw_cmd->cmd[SIZECODE2] = 0xff;
+	else
+		raw_cmd->cmd[SIZECODE2] = 0x80;
+	raw_cmd->track = raw_cmd->cmd[TRACK] << STRETCH(_floppy);
+	raw_cmd->cmd[DR_SELECT] = UNIT(current_drive) + PH_HEAD(_floppy, raw_cmd->cmd[HEAD]);
+	raw_cmd->cmd[GAP] = _floppy->gap;
+	ssize = DIV_ROUND_UP(1 << raw_cmd->cmd[SIZECODE], 4);
+	raw_cmd->cmd[SECT_PER_TRACK] = _floppy->sect << 2 >> raw_cmd->cmd[SIZECODE];
+	raw_cmd->cmd[SECTOR] = ((fsector_t % _floppy->sect) << 2 >> raw_cmd->cmd[SIZECODE]) +
+	    FD_SECTBASE(_floppy);
+
+	/* tracksize describes the size which can be filled up with sectors
+	 * of size ssize.
+	 */
+	tracksize = _floppy->sect - _floppy->sect % ssize;
+	if (tracksize < _floppy->sect) {
+		raw_cmd->cmd[SECT_PER_TRACK]++;
+		if (tracksize <= fsector_t % _floppy->sect)
+			raw_cmd->cmd[SECTOR]--;
+
+		/* if we are beyond tracksize, fill up using smaller sectors */
+		while (tracksize <= fsector_t % _floppy->sect) {
+			while (tracksize + ssize > _floppy->sect) {
+				raw_cmd->cmd[SIZECODE]--;
+				ssize >>= 1;
+			}
+			raw_cmd->cmd[SECTOR]++;
+			raw_cmd->cmd[SECT_PER_TRACK]++;
+			tracksize += ssize;
+		}
+		max_sector = raw_cmd->cmd[HEAD] * _floppy->sect + tracksize;
+	} else if (!raw_cmd->cmd[TRACK] && !raw_cmd->cmd[HEAD] && !(_floppy->rate & FD_2M) && probing) {
+		max_sector = _floppy->sect;
+	} else if (!raw_cmd->cmd[HEAD] && CT(raw_cmd->cmd[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 = blk_rq_sectors(current_req);
+	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(raw_cmd->cmd[COMMAND]) == FD_READ) {
+			copy_buffer(1, max_sector, buffer_max);
+			return 1;
+		}
+	} else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
+		if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) {
+			unsigned int sectors;
+
+			sectors = fsector_t + blk_rq_sectors(current_req);
+			if (sectors > ssize && sectors < ssize + ssize)
+				max_size = ssize + ssize;
+			else
+				max_size = ssize;
+		}
+		raw_cmd->flags &= ~FD_RAW_WRITE;
+		raw_cmd->flags |= FD_RAW_READ;
+		raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_READ);
+	}
+
+	if (CT(raw_cmd->cmd[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(raw_cmd->cmd[COMMAND]) == FD_READ ||
+	      (!in_sector_offset && blk_rq_sectors(current_req) >= 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(raw_cmd->cmd[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) */
+		if (in_sector_offset && buffer_track == -1)
+			DPRINT("internal error offset !=0 on write\n");
+		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;
+	if ((raw_cmd->length < current_count_sectors << 9) ||
+	    (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE &&
+	     (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
+	      aligned_sector_t < buffer_min)) ||
+	    raw_cmd->length % (128 << raw_cmd->cmd[SIZECODE]) ||
+	    raw_cmd->length <= 0 || current_count_sectors <= 0) {
+		DPRINT("fractionary current count b=%lx s=%lx\n",
+		       raw_cmd->length, current_count_sectors);
+		pr_info("addr=%d, length=%ld\n",
+			(int)((raw_cmd->kernel_data -
+			       floppy_track_buffer) >> 9),
+			current_count_sectors);
+		pr_info("st=%d ast=%d mse=%d msi=%d\n",
+			fsector_t, aligned_sector_t, max_sector, max_size);
+		pr_info("ssize=%x SIZECODE=%d\n", ssize, raw_cmd->cmd[SIZECODE]);
+		pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
+			raw_cmd->cmd[COMMAND], raw_cmd->cmd[SECTOR],
+			raw_cmd->cmd[HEAD], raw_cmd->cmd[TRACK]);
+		pr_info("buffer drive=%d\n", buffer_drive);
+		pr_info("buffer track=%d\n", buffer_track);
+		pr_info("buffer_min=%d\n", buffer_min);
+		pr_info("buffer_max=%d\n", buffer_max);
+		return 0;
+	}
+
+	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");
+		pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n",
+			fsector_t, buffer_min, raw_cmd->length >> 9);
+		pr_info("current_count_sectors=%ld\n",
+			current_count_sectors);
+		if (CT(raw_cmd->cmd[COMMAND]) == FD_READ)
+			pr_info("read\n");
+		if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE)
+			pr_info("write\n");
+		return 0;
+	}
+	if (raw_cmd->length == 0) {
+		DPRINT("zero dma transfer attempted from make_raw_request\n");
+		return 0;
+	}
+
+	virtualdmabug_workaround();
+	return 2;
+}
+
+static int set_next_request(void)
+{
+	current_req = list_first_entry_or_null(&floppy_reqs, struct request,
+					       queuelist);
+	if (current_req) {
+		floppy_errors = 0;
+		list_del_init(&current_req->queuelist);
+		return 1;
+	}
+	return 0;
+}
+
+/* Starts or continues processing request. Will automatically unlock the
+ * driver at end of request.
+ */
+static void redo_fd_request(void)
+{
+	int drive;
+	int tmp;
+
+	lastredo = jiffies;
+	if (current_drive < N_DRIVE)
+		floppy_off(current_drive);
+
+do_request:
+	if (!current_req) {
+		int pending;
+
+		spin_lock_irq(&floppy_lock);
+		pending = set_next_request();
+		spin_unlock_irq(&floppy_lock);
+		if (!pending) {
+			do_floppy = NULL;
+			unlock_fdc();
+			return;
+		}
+	}
+	drive = (long)current_req->q->disk->private_data;
+	set_fdc(drive);
+	reschedule_timeout(current_drive, "redo fd request");
+
+	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) ||
+	    test_bit(FD_DISK_CHANGED_BIT, &drive_state[current_drive].flags)) {
+		DPRINT("disk absent or changed during operation\n");
+		request_done(0);
+		goto do_request;
+	}
+	if (!_floppy) {	/* Autodetection */
+		if (!probing) {
+			drive_state[current_drive].probed_format = 0;
+			if (next_valid_format(current_drive)) {
+				DPRINT("no autodetectable formats\n");
+				_floppy = NULL;
+				request_done(0);
+				goto do_request;
+			}
+		}
+		probing = 1;
+		_floppy = floppy_type + drive_params[current_drive].autodetect[drive_state[current_drive].probed_format];
+	} else
+		probing = 0;
+	tmp = make_raw_rw_request();
+	if (tmp < 2) {
+		request_done(tmp);
+		goto do_request;
+	}
+
+	if (test_bit(FD_NEED_TWADDLE_BIT, &drive_state[current_drive].flags))
+		twaddle(current_fdc, current_drive);
+	schedule_bh(floppy_start);
+	debugt(__func__, "queue fd request");
+	return;
+}
+
+static const struct cont_t rw_cont = {
+	.interrupt	= rw_interrupt,
+	.redo		= redo_fd_request,
+	.error		= bad_flp_intr,
+	.done		= request_done
+};
+
+/* schedule the request and automatically unlock the driver on completion */
+static void process_fd_request(void)
+{
+	cont = &rw_cont;
+	schedule_bh(redo_fd_request);
+}
+
+static blk_status_t floppy_queue_rq(struct blk_mq_hw_ctx *hctx,
+				    const struct blk_mq_queue_data *bd)
+{
+	blk_mq_start_request(bd->rq);
+
+	if (WARN(max_buffer_sectors == 0,
+		 "VFS: %s called on non-open device\n", __func__))
+		return BLK_STS_IOERR;
+
+	if (WARN(atomic_read(&usage_count) == 0,
+		 "warning: usage count=0, current_req=%p sect=%ld flags=%llx\n",
+		 current_req, (long)blk_rq_pos(current_req),
+		 (__force unsigned long long) current_req->cmd_flags))
+		return BLK_STS_IOERR;
+
+	if (test_and_set_bit(0, &fdc_busy)) {
+		/* fdc busy, this new request will be treated when the
+		   current one is done */
+		is_alive(__func__, "old request running");
+		return BLK_STS_RESOURCE;
+	}
+
+	spin_lock_irq(&floppy_lock);
+	list_add_tail(&bd->rq->queuelist, &floppy_reqs);
+	spin_unlock_irq(&floppy_lock);
+
+	command_status = FD_COMMAND_NONE;
+	__reschedule_timeout(MAXTIMEOUT, "fd_request");
+	set_fdc(0);
+	process_fd_request();
+	is_alive(__func__, "");
+	return BLK_STS_OK;
+}
+
+static const struct cont_t poll_cont = {
+	.interrupt	= success_and_wakeup,
+	.redo		= floppy_ready,
+	.error		= generic_failure,
+	.done		= generic_done
+};
+
+static int poll_drive(bool interruptible, int flag)
+{
+	/* 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;
+	debug_dcl(drive_params[current_drive].flags,
+		  "setting NEWCHANGE in poll_drive\n");
+	set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags);
+
+	return wait_til_done(floppy_ready, interruptible);
+}
+
+/*
+ * User triggered reset
+ * ====================
+ */
+
+static void reset_intr(void)
+{
+	pr_info("weird, reset interrupt called\n");
+}
+
+static const struct cont_t reset_cont = {
+	.interrupt	= reset_intr,
+	.redo		= success_and_wakeup,
+	.error		= generic_failure,
+	.done		= generic_done
+};
+
+/*
+ * Resets the FDC connected to drive <drive>.
+ * Both current_drive and current_fdc are changed to match the new drive.
+ */
+static int user_reset_fdc(int drive, int arg, bool interruptible)
+{
+	int ret;
+
+	if (lock_fdc(drive))
+		return -EINTR;
+
+	if (arg == FD_RESET_ALWAYS)
+		fdc_state[current_fdc].reset = 1;
+	if (fdc_state[current_fdc].reset) {
+		/* note: reset_fdc will take care of unlocking the driver
+		 * on completion.
+		 */
+		cont = &reset_cont;
+		ret = wait_til_done(reset_fdc, interruptible);
+		if (ret == -EINTR)
+			return -EINTR;
+	}
+	process_fd_request();
+	return 0;
+}
+
+/*
+ * 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;
+}
+
+static const char *drive_name(int type, int drive)
+{
+	struct floppy_struct *floppy;
+
+	if (type)
+		floppy = floppy_type + type;
+	else {
+		if (drive_params[drive].native_format)
+			floppy = floppy_type + drive_params[drive].native_format;
+		else
+			return "(null)";
+	}
+	if (floppy->name)
+		return floppy->name;
+	else
+		return "(null)";
+}
+
+#ifdef CONFIG_BLK_DEV_FD_RAWCMD
+
+/* raw commands */
+static void raw_cmd_done(int flag)
+{
+	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 > FD_RAW_REPLY_SIZE)
+			raw_cmd->reply_count = 0;
+		memcpy(raw_cmd->reply, reply_buffer, raw_cmd->reply_count);
+
+		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(&motor_off_timer[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 const struct cont_t raw_cmd_cont = {
+	.interrupt	= success_and_wakeup,
+	.redo		= floppy_start,
+	.error		= generic_failure,
+	.done		= raw_cmd_done
+};
+
+static int raw_cmd_copyout(int cmd, void __user *param,
+				  struct floppy_raw_cmd *ptr)
+{
+	int ret;
+
+	while (ptr) {
+		struct floppy_raw_cmd cmd = *ptr;
+		cmd.next = NULL;
+		cmd.kernel_data = NULL;
+		ret = copy_to_user(param, &cmd, sizeof(cmd));
+		if (ret)
+			return -EFAULT;
+		param += sizeof(struct floppy_raw_cmd);
+		if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
+			if (ptr->length >= 0 &&
+			    ptr->length <= ptr->buffer_length) {
+				long length = ptr->buffer_length - ptr->length;
+				ret = fd_copyout(ptr->data, ptr->kernel_data,
+						 length);
+				if (ret)
+					return ret;
+			}
+		}
+		ptr = ptr->next;
+	}
+
+	return 0;
+}
+
+static void raw_cmd_free(struct floppy_raw_cmd **ptr)
+{
+	struct floppy_raw_cmd *next;
+	struct floppy_raw_cmd *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;
+	}
+}
+
+#define MAX_LEN (1UL << MAX_ORDER << PAGE_SHIFT)
+
+static int raw_cmd_copyin(int cmd, void __user *param,
+				 struct floppy_raw_cmd **rcmd)
+{
+	struct floppy_raw_cmd *ptr;
+	int ret;
+
+	*rcmd = NULL;
+
+loop:
+	ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_KERNEL);
+	if (!ptr)
+		return -ENOMEM;
+	*rcmd = ptr;
+	ret = copy_from_user(ptr, param, sizeof(*ptr));
+	ptr->next = NULL;
+	ptr->buffer_length = 0;
+	ptr->kernel_data = NULL;
+	if (ret)
+		return -EFAULT;
+	param += sizeof(struct floppy_raw_cmd);
+	if (ptr->cmd_count > FD_RAW_CMD_FULLSIZE)
+		return -EINVAL;
+
+	memset(ptr->reply, 0, FD_RAW_REPLY_SIZE);
+	ptr->resultcode = 0;
+
+	if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
+		if (ptr->length <= 0 || ptr->length > MAX_LEN)
+			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) {
+		ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length);
+		if (ret)
+			return ret;
+	}
+
+	if (ptr->flags & FD_RAW_MORE) {
+		rcmd = &(ptr->next);
+		ptr->rate &= 0x43;
+		goto loop;
+	}
+
+	return 0;
+}
+
+static int raw_cmd_ioctl(int cmd, void __user *param)
+{
+	struct floppy_raw_cmd *my_raw_cmd;
+	int drive;
+	int ret2;
+	int ret;
+
+	if (fdc_state[current_fdc].rawcmd <= 1)
+		fdc_state[current_fdc].rawcmd = 1;
+	for (drive = 0; drive < N_DRIVE; drive++) {
+		if (FDC(drive) != current_fdc)
+			continue;
+		if (drive == current_drive) {
+			if (drive_state[drive].fd_ref > 1) {
+				fdc_state[current_fdc].rawcmd = 2;
+				break;
+			}
+		} else if (drive_state[drive].fd_ref) {
+			fdc_state[current_fdc].rawcmd = 2;
+			break;
+		}
+	}
+
+	if (fdc_state[current_fdc].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, true);
+	debug_dcl(drive_params[current_drive].flags,
+		  "calling disk change from raw_cmd ioctl\n");
+
+	if (ret != -EINTR && fdc_state[current_fdc].reset)
+		ret = -EIO;
+
+	drive_state[current_drive].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 floppy_raw_cmd_ioctl(int type, int drive, int cmd,
+				void __user *param)
+{
+	int ret;
+
+	pr_warn_once("Note: FDRAWCMD is deprecated and will be removed from the kernel in the near future.\n");
+
+	if (type)
+		return -EINVAL;
+	if (lock_fdc(drive))
+		return -EINTR;
+	set_floppy(drive);
+	ret = raw_cmd_ioctl(cmd, param);
+	if (ret == -EINTR)
+		return -EINTR;
+	process_fd_request();
+	return ret;
+}
+
+#else /* CONFIG_BLK_DEV_FD_RAWCMD */
+
+static int floppy_raw_cmd_ioctl(int type, int drive, int cmd,
+				void __user *param)
+{
+	return -EOPNOTSUPP;
+}
+
+#endif
+
+static int invalidate_drive(struct gendisk *disk)
+{
+	/* invalidate the buffer track to force a reread */
+	set_bit((long)disk->private_data, &fake_change);
+	process_fd_request();
+	if (disk_check_media_change(disk))
+		floppy_revalidate(disk);
+	return 0;
+}
+
+static 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 ((int)g->sect <= 0 ||
+	    (int)g->head <= 0 ||
+	    /* check for overflow in max_sector */
+	    (int)(g->sect * g->head) <= 0 ||
+	    /* check for zero in raw_cmd->cmd[F_SECT_PER_TRACK] */
+	    (unsigned char)((g->sect << 2) >> FD_SIZECODE(g)) == 0 ||
+	    g->track <= 0 || g->track > drive_params[drive].tracks >> STRETCH(g) ||
+	    /* check if reserved bits are set */
+	    (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
+		return -EINVAL;
+	if (type) {
+		if (!capable(CAP_SYS_ADMIN))
+			return -EPERM;
+		mutex_lock(&open_lock);
+		if (lock_fdc(drive)) {
+			mutex_unlock(&open_lock);
+			return -EINTR;
+		}
+		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 gendisk *disk = opened_disk[cnt];
+
+			if (!disk || ITYPE(drive_state[cnt].fd_device) != type)
+				continue;
+			disk_force_media_change(disk);
+		}
+		mutex_unlock(&open_lock);
+	} else {
+		int oldStretch;
+
+		if (lock_fdc(drive))
+			return -EINTR;
+		if (cmd != FDDEFPRM) {
+			/* notice a disk change immediately, else
+			 * we lose our settings immediately*/
+			if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
+				return -EINTR;
+		}
+		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)
+			drive_state[current_drive].keep_data = -1;
+		else
+			drive_state[current_drive].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 (drive_state[current_drive].maxblock > user_params[drive].sect ||
+		    drive_state[current_drive].maxtrack ||
+		    ((user_params[drive].sect ^ oldStretch) &
+		     (FD_SWAPSIDES | FD_SECTBASEMASK)))
+			invalidate_drive(bdev->bd_disk);
+		else
+			process_fd_request();
+	}
+	return 0;
+}
+
+/* handle obsolete ioctl's */
+static unsigned 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 int normalize_ioctl(unsigned 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)) {
+				pr_info("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 {
+		if (lock_fdc(drive))
+			return -EINTR;
+		if (poll_drive(false, 0) == -EINTR)
+			return -EINTR;
+		process_fd_request();
+		*g = current_type[drive];
+	}
+	if (!*g)
+		return -ENODEV;
+	return 0;
+}
+
+static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+	int drive = (long)bdev->bd_disk->private_data;
+	int type = ITYPE(drive_state[drive].fd_device);
+	struct floppy_struct *g;
+	int ret;
+
+	ret = get_floppy_geometry(drive, type, &g);
+	if (ret)
+		return ret;
+
+	geo->heads = g->head;
+	geo->sectors = g->sect;
+	geo->cylinders = g->track;
+	return 0;
+}
+
+static bool valid_floppy_drive_params(const short autodetect[FD_AUTODETECT_SIZE],
+		int native_format)
+{
+	size_t floppy_type_size = ARRAY_SIZE(floppy_type);
+	size_t i = 0;
+
+	for (i = 0; i < FD_AUTODETECT_SIZE; ++i) {
+		if (autodetect[i] < 0 ||
+		    autodetect[i] >= floppy_type_size)
+			return false;
+	}
+
+	if (native_format < 0 || native_format >= floppy_type_size)
+		return false;
+
+	return true;
+}
+
+static int fd_locked_ioctl(struct block_device *bdev, blk_mode_t mode,
+		unsigned int cmd, unsigned long param)
+{
+	int drive = (long)bdev->bd_disk->private_data;
+	int type = ITYPE(drive_state[drive].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 void *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;
+	}
+
+	if (!((cmd & 0xff00) == 0x0200))
+		return -EINVAL;
+
+	/* convert the old style command into a new style command */
+	ret = normalize_ioctl(&cmd, &size);
+	if (ret)
+		return ret;
+
+	/* permission checks */
+	if (((cmd & 0x40) &&
+	     !(mode & (BLK_OPEN_WRITE | BLK_OPEN_WRITE_IOCTL))) ||
+	    ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
+		return -EPERM;
+
+	if (WARN_ON(size < 0 || size > sizeof(inparam)))
+		return -EINVAL;
+
+	/* copyin */
+	memset(&inparam, 0, sizeof(inparam));
+	if (_IOC_DIR(cmd) & _IOC_WRITE) {
+		ret = fd_copyin((void __user *)param, &inparam, size);
+		if (ret)
+			return ret;
+	}
+
+	switch (cmd) {
+	case FDEJECT:
+		if (drive_state[drive].fd_ref != 1)
+			/* somebody else has this drive open */
+			return -EBUSY;
+		if (lock_fdc(drive))
+			return -EINTR;
+
+		/* do the actual eject. Fails on
+		 * non-Sparc architectures */
+		ret = fd_eject(UNIT(drive));
+
+		set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags);
+		set_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
+		process_fd_request();
+		return ret;
+	case FDCLRPRM:
+		if (lock_fdc(drive))
+			return -EINTR;
+		current_type[drive] = NULL;
+		floppy_sizes[drive] = MAX_DISK_SIZE << 1;
+		drive_state[drive].keep_data = 0;
+		return invalidate_drive(bdev->bd_disk);
+	case FDSETPRM:
+	case FDDEFPRM:
+		return set_geometry(cmd, &inparam.g, drive, type, bdev);
+	case FDGETPRM:
+		ret = get_floppy_geometry(drive, type,
+					  (struct floppy_struct **)&outparam);
+		if (ret)
+			return ret;
+		memcpy(&inparam.g, outparam,
+				offsetof(struct floppy_struct, name));
+		outparam = &inparam.g;
+		break;
+	case FDMSGON:
+		drive_params[drive].flags |= FTD_MSG;
+		return 0;
+	case FDMSGOFF:
+		drive_params[drive].flags &= ~FTD_MSG;
+		return 0;
+	case FDFMTBEG:
+		if (lock_fdc(drive))
+			return -EINTR;
+		if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
+			return -EINTR;
+		ret = drive_state[drive].flags;
+		process_fd_request();
+		if (ret & FD_VERIFY)
+			return -ENODEV;
+		if (!(ret & FD_DISK_WRITABLE))
+			return -EROFS;
+		return 0;
+	case FDFMTTRK:
+		if (drive_state[drive].fd_ref != 1)
+			return -EBUSY;
+		return do_format(drive, &inparam.f);
+	case FDFMTEND:
+	case FDFLUSH:
+		if (lock_fdc(drive))
+			return -EINTR;
+		return invalidate_drive(bdev->bd_disk);
+	case FDSETEMSGTRESH:
+		drive_params[drive].max_errors.reporting = (unsigned short)(param & 0x0f);
+		return 0;
+	case FDGETMAXERRS:
+		outparam = &drive_params[drive].max_errors;
+		break;
+	case FDSETMAXERRS:
+		drive_params[drive].max_errors = inparam.max_errors;
+		break;
+	case FDGETDRVTYP:
+		outparam = drive_name(type, drive);
+		SUPBOUND(size, strlen((const char *)outparam) + 1);
+		break;
+	case FDSETDRVPRM:
+		if (!valid_floppy_drive_params(inparam.dp.autodetect,
+				inparam.dp.native_format))
+			return -EINVAL;
+		drive_params[drive] = inparam.dp;
+		break;
+	case FDGETDRVPRM:
+		outparam = &drive_params[drive];
+		break;
+	case FDPOLLDRVSTAT:
+		if (lock_fdc(drive))
+			return -EINTR;
+		if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
+			return -EINTR;
+		process_fd_request();
+		fallthrough;
+	case FDGETDRVSTAT:
+		outparam = &drive_state[drive];
+		break;
+	case FDRESET:
+		return user_reset_fdc(drive, (int)param, true);
+	case FDGETFDCSTAT:
+		outparam = &fdc_state[FDC(drive)];
+		break;
+	case FDWERRORCLR:
+		memset(&write_errors[drive], 0, sizeof(write_errors[drive]));
+		return 0;
+	case FDWERRORGET:
+		outparam = &write_errors[drive];
+		break;
+	case FDRAWCMD:
+		return floppy_raw_cmd_ioctl(type, drive, cmd, (void __user *)param);
+	case FDTWADDLE:
+		if (lock_fdc(drive))
+			return -EINTR;
+		twaddle(current_fdc, current_drive);
+		process_fd_request();
+		return 0;
+	default:
+		return -EINVAL;
+	}
+
+	if (_IOC_DIR(cmd) & _IOC_READ)
+		return fd_copyout((void __user *)param, outparam, size);
+
+	return 0;
+}
+
+static int fd_ioctl(struct block_device *bdev, blk_mode_t mode,
+			     unsigned int cmd, unsigned long param)
+{
+	int ret;
+
+	mutex_lock(&floppy_mutex);
+	ret = fd_locked_ioctl(bdev, mode, cmd, param);
+	mutex_unlock(&floppy_mutex);
+
+	return ret;
+}
+
+#ifdef CONFIG_COMPAT
+
+struct compat_floppy_drive_params {
+	char		cmos;
+	compat_ulong_t	max_dtr;
+	compat_ulong_t	hlt;
+	compat_ulong_t	hut;
+	compat_ulong_t	srt;
+	compat_ulong_t	spinup;
+	compat_ulong_t	spindown;
+	unsigned char	spindown_offset;
+	unsigned char	select_delay;
+	unsigned char	rps;
+	unsigned char	tracks;
+	compat_ulong_t	timeout;
+	unsigned char	interleave_sect;
+	struct floppy_max_errors max_errors;
+	char		flags;
+	char		read_track;
+	short		autodetect[FD_AUTODETECT_SIZE];
+	compat_int_t	checkfreq;
+	compat_int_t	native_format;
+};
+
+struct compat_floppy_drive_struct {
+	signed char	flags;
+	compat_ulong_t	spinup_date;
+	compat_ulong_t	select_date;
+	compat_ulong_t	first_read_date;
+	short		probed_format;
+	short		track;
+	short		maxblock;
+	short		maxtrack;
+	compat_int_t	generation;
+	compat_int_t	keep_data;
+	compat_int_t	fd_ref;
+	compat_int_t	fd_device;
+	compat_int_t	last_checked;
+	compat_caddr_t dmabuf;
+	compat_int_t	bufblocks;
+};
+
+struct compat_floppy_fdc_state {
+	compat_int_t	spec1;
+	compat_int_t	spec2;
+	compat_int_t	dtr;
+	unsigned char	version;
+	unsigned char	dor;
+	compat_ulong_t	address;
+	unsigned int	rawcmd:2;
+	unsigned int	reset:1;
+	unsigned int	need_configure:1;
+	unsigned int	perp_mode:2;
+	unsigned int	has_fifo:1;
+	unsigned int	driver_version;
+	unsigned char	track[4];
+};
+
+struct compat_floppy_write_errors {
+	unsigned int	write_errors;
+	compat_ulong_t	first_error_sector;
+	compat_int_t	first_error_generation;
+	compat_ulong_t	last_error_sector;
+	compat_int_t	last_error_generation;
+	compat_uint_t	badness;
+};
+
+#define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct)
+#define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct)
+#define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params)
+#define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params)
+#define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct)
+#define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct)
+#define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)
+#define FDWERRORGET32  _IOR(2, 0x17, struct compat_floppy_write_errors)
+
+static int compat_set_geometry(struct block_device *bdev, blk_mode_t mode,
+		unsigned int cmd, struct compat_floppy_struct __user *arg)
+{
+	struct floppy_struct v;
+	int drive, type;
+	int err;
+
+	BUILD_BUG_ON(offsetof(struct floppy_struct, name) !=
+		     offsetof(struct compat_floppy_struct, name));
+
+	if (!(mode & (BLK_OPEN_WRITE | BLK_OPEN_WRITE_IOCTL)))
+		return -EPERM;
+
+	memset(&v, 0, sizeof(struct floppy_struct));
+	if (copy_from_user(&v, arg, offsetof(struct floppy_struct, name)))
+		return -EFAULT;
+
+	mutex_lock(&floppy_mutex);
+	drive = (long)bdev->bd_disk->private_data;
+	type = ITYPE(drive_state[drive].fd_device);
+	err = set_geometry(cmd == FDSETPRM32 ? FDSETPRM : FDDEFPRM,
+			&v, drive, type, bdev);
+	mutex_unlock(&floppy_mutex);
+	return err;
+}
+
+static int compat_get_prm(int drive,
+			  struct compat_floppy_struct __user *arg)
+{
+	struct compat_floppy_struct v;
+	struct floppy_struct *p;
+	int err;
+
+	memset(&v, 0, sizeof(v));
+	mutex_lock(&floppy_mutex);
+	err = get_floppy_geometry(drive, ITYPE(drive_state[drive].fd_device),
+				  &p);
+	if (err) {
+		mutex_unlock(&floppy_mutex);
+		return err;
+	}
+	memcpy(&v, p, offsetof(struct floppy_struct, name));
+	mutex_unlock(&floppy_mutex);
+	if (copy_to_user(arg, &v, sizeof(struct compat_floppy_struct)))
+		return -EFAULT;
+	return 0;
+}
+
+static int compat_setdrvprm(int drive,
+			    struct compat_floppy_drive_params __user *arg)
+{
+	struct compat_floppy_drive_params v;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+	if (copy_from_user(&v, arg, sizeof(struct compat_floppy_drive_params)))
+		return -EFAULT;
+	if (!valid_floppy_drive_params(v.autodetect, v.native_format))
+		return -EINVAL;
+	mutex_lock(&floppy_mutex);
+	drive_params[drive].cmos = v.cmos;
+	drive_params[drive].max_dtr = v.max_dtr;
+	drive_params[drive].hlt = v.hlt;
+	drive_params[drive].hut = v.hut;
+	drive_params[drive].srt = v.srt;
+	drive_params[drive].spinup = v.spinup;
+	drive_params[drive].spindown = v.spindown;
+	drive_params[drive].spindown_offset = v.spindown_offset;
+	drive_params[drive].select_delay = v.select_delay;
+	drive_params[drive].rps = v.rps;
+	drive_params[drive].tracks = v.tracks;
+	drive_params[drive].timeout = v.timeout;
+	drive_params[drive].interleave_sect = v.interleave_sect;
+	drive_params[drive].max_errors = v.max_errors;
+	drive_params[drive].flags = v.flags;
+	drive_params[drive].read_track = v.read_track;
+	memcpy(drive_params[drive].autodetect, v.autodetect,
+	       sizeof(v.autodetect));
+	drive_params[drive].checkfreq = v.checkfreq;
+	drive_params[drive].native_format = v.native_format;
+	mutex_unlock(&floppy_mutex);
+	return 0;
+}
+
+static int compat_getdrvprm(int drive,
+			    struct compat_floppy_drive_params __user *arg)
+{
+	struct compat_floppy_drive_params v;
+
+	memset(&v, 0, sizeof(struct compat_floppy_drive_params));
+	mutex_lock(&floppy_mutex);
+	v.cmos = drive_params[drive].cmos;
+	v.max_dtr = drive_params[drive].max_dtr;
+	v.hlt = drive_params[drive].hlt;
+	v.hut = drive_params[drive].hut;
+	v.srt = drive_params[drive].srt;
+	v.spinup = drive_params[drive].spinup;
+	v.spindown = drive_params[drive].spindown;
+	v.spindown_offset = drive_params[drive].spindown_offset;
+	v.select_delay = drive_params[drive].select_delay;
+	v.rps = drive_params[drive].rps;
+	v.tracks = drive_params[drive].tracks;
+	v.timeout = drive_params[drive].timeout;
+	v.interleave_sect = drive_params[drive].interleave_sect;
+	v.max_errors = drive_params[drive].max_errors;
+	v.flags = drive_params[drive].flags;
+	v.read_track = drive_params[drive].read_track;
+	memcpy(v.autodetect, drive_params[drive].autodetect,
+	       sizeof(v.autodetect));
+	v.checkfreq = drive_params[drive].checkfreq;
+	v.native_format = drive_params[drive].native_format;
+	mutex_unlock(&floppy_mutex);
+
+	if (copy_to_user(arg, &v, sizeof(struct compat_floppy_drive_params)))
+		return -EFAULT;
+	return 0;
+}
+
+static int compat_getdrvstat(int drive, bool poll,
+			    struct compat_floppy_drive_struct __user *arg)
+{
+	struct compat_floppy_drive_struct v;
+
+	memset(&v, 0, sizeof(struct compat_floppy_drive_struct));
+	mutex_lock(&floppy_mutex);
+
+	if (poll) {
+		if (lock_fdc(drive))
+			goto Eintr;
+		if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
+			goto Eintr;
+		process_fd_request();
+	}
+	v.spinup_date = drive_state[drive].spinup_date;
+	v.select_date = drive_state[drive].select_date;
+	v.first_read_date = drive_state[drive].first_read_date;
+	v.probed_format = drive_state[drive].probed_format;
+	v.track = drive_state[drive].track;
+	v.maxblock = drive_state[drive].maxblock;
+	v.maxtrack = drive_state[drive].maxtrack;
+	v.generation = drive_state[drive].generation;
+	v.keep_data = drive_state[drive].keep_data;
+	v.fd_ref = drive_state[drive].fd_ref;
+	v.fd_device = drive_state[drive].fd_device;
+	v.last_checked = drive_state[drive].last_checked;
+	v.dmabuf = (uintptr_t) drive_state[drive].dmabuf;
+	v.bufblocks = drive_state[drive].bufblocks;
+	mutex_unlock(&floppy_mutex);
+
+	if (copy_to_user(arg, &v, sizeof(struct compat_floppy_drive_struct)))
+		return -EFAULT;
+	return 0;
+Eintr:
+	mutex_unlock(&floppy_mutex);
+	return -EINTR;
+}
+
+static int compat_getfdcstat(int drive,
+			    struct compat_floppy_fdc_state __user *arg)
+{
+	struct compat_floppy_fdc_state v32;
+	struct floppy_fdc_state v;
+
+	mutex_lock(&floppy_mutex);
+	v = fdc_state[FDC(drive)];
+	mutex_unlock(&floppy_mutex);
+
+	memset(&v32, 0, sizeof(struct compat_floppy_fdc_state));
+	v32.spec1 = v.spec1;
+	v32.spec2 = v.spec2;
+	v32.dtr = v.dtr;
+	v32.version = v.version;
+	v32.dor = v.dor;
+	v32.address = v.address;
+	v32.rawcmd = v.rawcmd;
+	v32.reset = v.reset;
+	v32.need_configure = v.need_configure;
+	v32.perp_mode = v.perp_mode;
+	v32.has_fifo = v.has_fifo;
+	v32.driver_version = v.driver_version;
+	memcpy(v32.track, v.track, 4);
+	if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_fdc_state)))
+		return -EFAULT;
+	return 0;
+}
+
+static int compat_werrorget(int drive,
+			    struct compat_floppy_write_errors __user *arg)
+{
+	struct compat_floppy_write_errors v32;
+	struct floppy_write_errors v;
+
+	memset(&v32, 0, sizeof(struct compat_floppy_write_errors));
+	mutex_lock(&floppy_mutex);
+	v = write_errors[drive];
+	mutex_unlock(&floppy_mutex);
+	v32.write_errors = v.write_errors;
+	v32.first_error_sector = v.first_error_sector;
+	v32.first_error_generation = v.first_error_generation;
+	v32.last_error_sector = v.last_error_sector;
+	v32.last_error_generation = v.last_error_generation;
+	v32.badness = v.badness;
+	if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_write_errors)))
+		return -EFAULT;
+	return 0;
+}
+
+static int fd_compat_ioctl(struct block_device *bdev, blk_mode_t mode,
+		unsigned int cmd, unsigned long param)
+{
+	int drive = (long)bdev->bd_disk->private_data;
+	switch (cmd) {
+	case CDROMEJECT: /* CD-ROM eject */
+	case 0x6470:	 /* SunOS floppy eject */
+
+	case FDMSGON:
+	case FDMSGOFF:
+	case FDSETEMSGTRESH:
+	case FDFLUSH:
+	case FDWERRORCLR:
+	case FDEJECT:
+	case FDCLRPRM:
+	case FDFMTBEG:
+	case FDRESET:
+	case FDTWADDLE:
+		return fd_ioctl(bdev, mode, cmd, param);
+	case FDSETMAXERRS:
+	case FDGETMAXERRS:
+	case FDGETDRVTYP:
+	case FDFMTEND:
+	case FDFMTTRK:
+	case FDRAWCMD:
+		return fd_ioctl(bdev, mode, cmd,
+				(unsigned long)compat_ptr(param));
+	case FDSETPRM32:
+	case FDDEFPRM32:
+		return compat_set_geometry(bdev, mode, cmd, compat_ptr(param));
+	case FDGETPRM32:
+		return compat_get_prm(drive, compat_ptr(param));
+	case FDSETDRVPRM32:
+		return compat_setdrvprm(drive, compat_ptr(param));
+	case FDGETDRVPRM32:
+		return compat_getdrvprm(drive, compat_ptr(param));
+	case FDPOLLDRVSTAT32:
+		return compat_getdrvstat(drive, true, compat_ptr(param));
+	case FDGETDRVSTAT32:
+		return compat_getdrvstat(drive, false, compat_ptr(param));
+	case FDGETFDCSTAT32:
+		return compat_getfdcstat(drive, compat_ptr(param));
+	case FDWERRORGET32:
+		return compat_werrorget(drive, compat_ptr(param));
+	}
+	return -EINVAL;
+}
+#endif
+
+static void __init config_types(void)
+{
+	bool has_drive = false;
+	int drive;
+
+	/* read drive info out of physical CMOS */
+	drive = 0;
+	if (!drive_params[drive].cmos)
+		drive_params[drive].cmos = FLOPPY0_TYPE;
+	drive = 1;
+	if (!drive_params[drive].cmos)
+		drive_params[drive].cmos = FLOPPY1_TYPE;
+
+	/* FIXME: additional physical CMOS drive detection should go here */
+
+	for (drive = 0; drive < N_DRIVE; drive++) {
+		unsigned int type = drive_params[drive].cmos;
+		struct floppy_drive_params *params;
+		const char *name = NULL;
+		char temparea[32];
+
+		if (type < ARRAY_SIZE(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;
+			snprintf(temparea, sizeof(temparea),
+				 "unknown type %d (usb?)", type);
+			name = temparea;
+		}
+		if (name) {
+			const char *prepend;
+			if (!has_drive) {
+				prepend = "";
+				has_drive = true;
+				pr_info("Floppy drive(s):");
+			} else {
+				prepend = ",";
+			}
+
+			pr_cont("%s fd%d is %s", prepend, drive, name);
+		}
+		drive_params[drive] = *params;
+	}
+
+	if (has_drive)
+		pr_cont("\n");
+}
+
+static void floppy_release(struct gendisk *disk)
+{
+	int drive = (long)disk->private_data;
+
+	mutex_lock(&floppy_mutex);
+	mutex_lock(&open_lock);
+	if (!drive_state[drive].fd_ref--) {
+		DPRINT("floppy_release with fd_ref == 0");
+		drive_state[drive].fd_ref = 0;
+	}
+	if (!drive_state[drive].fd_ref)
+		opened_disk[drive] = NULL;
+	mutex_unlock(&open_lock);
+	mutex_unlock(&floppy_mutex);
+}
+
+/*
+ * 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 gendisk *disk, blk_mode_t mode)
+{
+	int drive = (long)disk->private_data;
+	int old_dev, new_dev;
+	int try;
+	int res = -EBUSY;
+	char *tmp;
+
+	mutex_lock(&floppy_mutex);
+	mutex_lock(&open_lock);
+	old_dev = drive_state[drive].fd_device;
+	if (opened_disk[drive] && opened_disk[drive] != disk)
+		goto out2;
+
+	if (!drive_state[drive].fd_ref && (drive_params[drive].flags & FD_BROKEN_DCL)) {
+		set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags);
+		set_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
+	}
+
+	drive_state[drive].fd_ref++;
+
+	opened_disk[drive] = disk;
+
+	res = -ENXIO;
+
+	if (!floppy_track_buffer) {
+		/* if opening an ED drive, reserve a big buffer,
+		 * else reserve a small one */
+		if ((drive_params[drive].cmos == 6) || (drive_params[drive].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;
+		}
+	}
+
+	new_dev = disk->first_minor;
+	drive_state[drive].fd_device = new_dev;
+	set_capacity(disks[drive][ITYPE(new_dev)], floppy_sizes[new_dev]);
+	if (old_dev != -1 && old_dev != new_dev) {
+		if (buffer_drive == drive)
+			buffer_track = -1;
+	}
+
+	if (fdc_state[FDC(drive)].rawcmd == 1)
+		fdc_state[FDC(drive)].rawcmd = 2;
+	if (!(mode & BLK_OPEN_NDELAY)) {
+		if (mode & (BLK_OPEN_READ | BLK_OPEN_WRITE)) {
+			drive_state[drive].last_checked = 0;
+			clear_bit(FD_OPEN_SHOULD_FAIL_BIT,
+				  &drive_state[drive].flags);
+			if (disk_check_media_change(disk))
+				floppy_revalidate(disk);
+			if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags))
+				goto out;
+			if (test_bit(FD_OPEN_SHOULD_FAIL_BIT, &drive_state[drive].flags))
+				goto out;
+		}
+		res = -EROFS;
+		if ((mode & BLK_OPEN_WRITE) &&
+		    !test_bit(FD_DISK_WRITABLE_BIT, &drive_state[drive].flags))
+			goto out;
+	}
+	mutex_unlock(&open_lock);
+	mutex_unlock(&floppy_mutex);
+	return 0;
+out:
+	drive_state[drive].fd_ref--;
+
+	if (!drive_state[drive].fd_ref)
+		opened_disk[drive] = NULL;
+out2:
+	mutex_unlock(&open_lock);
+	mutex_unlock(&floppy_mutex);
+	return res;
+}
+
+/*
+ * Check if the disk has been changed or if a change has been faked.
+ */
+static unsigned int floppy_check_events(struct gendisk *disk,
+					unsigned int clearing)
+{
+	int drive = (long)disk->private_data;
+
+	if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) ||
+	    test_bit(FD_VERIFY_BIT, &drive_state[drive].flags))
+		return DISK_EVENT_MEDIA_CHANGE;
+
+	if (time_after(jiffies, drive_state[drive].last_checked + drive_params[drive].checkfreq)) {
+		if (lock_fdc(drive))
+			return 0;
+		poll_drive(false, 0);
+		process_fd_request();
+	}
+
+	if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) ||
+	    test_bit(FD_VERIFY_BIT, &drive_state[drive].flags) ||
+	    test_bit(drive, &fake_change) ||
+	    drive_no_geom(drive))
+		return DISK_EVENT_MEDIA_CHANGE;
+	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.
+ */
+
+struct rb0_cbdata {
+	int drive;
+	struct completion complete;
+};
+
+static void floppy_rb0_cb(struct bio *bio)
+{
+	struct rb0_cbdata *cbdata = (struct rb0_cbdata *)bio->bi_private;
+	int drive = cbdata->drive;
+
+	if (bio->bi_status) {
+		pr_info("floppy: error %d while reading block 0\n",
+			bio->bi_status);
+		set_bit(FD_OPEN_SHOULD_FAIL_BIT, &drive_state[drive].flags);
+	}
+	complete(&cbdata->complete);
+}
+
+static int __floppy_read_block_0(struct block_device *bdev, int drive)
+{
+	struct bio bio;
+	struct bio_vec bio_vec;
+	struct page *page;
+	struct rb0_cbdata cbdata;
+
+	page = alloc_page(GFP_NOIO);
+	if (!page) {
+		process_fd_request();
+		return -ENOMEM;
+	}
+
+	cbdata.drive = drive;
+
+	bio_init(&bio, bdev, &bio_vec, 1, REQ_OP_READ);
+	__bio_add_page(&bio, page, block_size(bdev), 0);
+
+	bio.bi_iter.bi_sector = 0;
+	bio.bi_flags |= (1 << BIO_QUIET);
+	bio.bi_private = &cbdata;
+	bio.bi_end_io = floppy_rb0_cb;
+
+	init_completion(&cbdata.complete);
+
+	submit_bio(&bio);
+	process_fd_request();
+
+	wait_for_completion(&cbdata.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;
+	int cf;
+	int res = 0;
+
+	if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) ||
+	    test_bit(FD_VERIFY_BIT, &drive_state[drive].flags) ||
+	    test_bit(drive, &fake_change) ||
+	    drive_no_geom(drive)) {
+		if (WARN(atomic_read(&usage_count) == 0,
+			 "VFS: revalidate called on non-open device.\n"))
+			return -EFAULT;
+
+		res = lock_fdc(drive);
+		if (res)
+			return res;
+		cf = (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) ||
+		      test_bit(FD_VERIFY_BIT, &drive_state[drive].flags));
+		if (!(cf || test_bit(drive, &fake_change) || drive_no_geom(drive))) {
+			process_fd_request();	/*already done by another thread */
+			return 0;
+		}
+		drive_state[drive].maxblock = 0;
+		drive_state[drive].maxtrack = 0;
+		if (buffer_drive == drive)
+			buffer_track = -1;
+		clear_bit(drive, &fake_change);
+		clear_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags);
+		if (cf)
+			drive_state[drive].generation++;
+		if (drive_no_geom(drive)) {
+			/* auto-sensing */
+			res = __floppy_read_block_0(opened_disk[drive]->part0,
+						    drive);
+		} else {
+			if (cf)
+				poll_drive(false, FD_RAW_NEED_DISK);
+			process_fd_request();
+		}
+	}
+	set_capacity(disk, floppy_sizes[drive_state[drive].fd_device]);
+	return res;
+}
+
+static const struct block_device_operations floppy_fops = {
+	.owner			= THIS_MODULE,
+	.open			= floppy_open,
+	.release		= floppy_release,
+	.ioctl			= fd_ioctl,
+	.getgeo			= fd_getgeo,
+	.check_events		= floppy_check_events,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl		= fd_compat_ioctl,
+#endif
+};
+
+/*
+ * Floppy Driver initialization
+ * =============================
+ */
+
+/* Determine the floppy disk controller type */
+/* This routine was written by David C. Niemi */
+static char __init get_fdc_version(int fdc)
+{
+	int r;
+
+	output_byte(fdc, FD_DUMPREGS);	/* 82072 and better know DUMPREGS */
+	if (fdc_state[fdc].reset)
+		return FDC_NONE;
+	r = result(fdc);
+	if (r <= 0x00)
+		return FDC_NONE;	/* No FDC present ??? */
+	if ((r == 1) && (reply_buffer[ST0] == 0x80)) {
+		pr_info("FDC %d is an 8272A\n", fdc);
+		return FDC_8272A;	/* 8272a/765 don't know DUMPREGS */
+	}
+	if (r != 10) {
+		pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
+			fdc, r);
+		return FDC_UNKNOWN;
+	}
+
+	if (!fdc_configure(fdc)) {
+		pr_info("FDC %d is an 82072\n", fdc);
+		return FDC_82072;	/* 82072 doesn't know CONFIGURE */
+	}
+
+	output_byte(fdc, FD_PERPENDICULAR);
+	if (need_more_output(fdc) == MORE_OUTPUT) {
+		output_byte(fdc, 0);
+	} else {
+		pr_info("FDC %d is an 82072A\n", fdc);
+		return FDC_82072A;	/* 82072A as found on Sparcs. */
+	}
+
+	output_byte(fdc, FD_UNLOCK);
+	r = result(fdc);
+	if ((r == 1) && (reply_buffer[ST0] == 0x80)) {
+		pr_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[ST0] != 0x00)) {
+		pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
+			fdc, r);
+		return FDC_UNKNOWN;
+	}
+	output_byte(fdc, FD_PARTID);
+	r = result(fdc);
+	if (r != 1) {
+		pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n",
+			fdc, r);
+		return FDC_UNKNOWN;
+	}
+	if (reply_buffer[ST0] == 0x80) {
+		pr_info("FDC %d is a post-1991 82077\n", fdc);
+		return FDC_82077;	/* Revised 82077AA passes all the tests */
+	}
+	switch (reply_buffer[ST0] >> 5) {
+	case 0x0:
+		/* Either a 82078-1 or a 82078SL running at 5Volt */
+		pr_info("FDC %d is an 82078.\n", fdc);
+		return FDC_82078;
+	case 0x1:
+		pr_info("FDC %d is a 44pin 82078\n", fdc);
+		return FDC_82078;
+	case 0x2:
+		pr_info("FDC %d is a S82078B\n", fdc);
+		return FDC_S82078B;
+	case 0x3:
+		pr_info("FDC %d is a National Semiconductor PC87306\n", fdc);
+		return FDC_87306;
+	default:
+		pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
+			fdc, reply_buffer[ST0] >> 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
+	drive_params[current_drive].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++)
+			pr_cont(" %s", config_params[i].name);
+		pr_cont("\n");
+	} else
+		DPRINT("botched floppy option\n");
+	DPRINT("Read Documentation/admin-guide/blockdev/floppy.rst\n");
+	return 0;
+}
+
+static int have_no_fdc = -ENODEV;
+
+static ssize_t floppy_cmos_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct platform_device *p = to_platform_device(dev);
+	int drive;
+
+	drive = p->id;
+	return sprintf(buf, "%X\n", drive_params[drive].cmos);
+}
+
+static DEVICE_ATTR(cmos, 0444, floppy_cmos_show, NULL);
+
+static struct attribute *floppy_dev_attrs[] = {
+	&dev_attr_cmos.attr,
+	NULL
+};
+
+ATTRIBUTE_GROUPS(floppy_dev);
+
+static void floppy_device_release(struct device *dev)
+{
+}
+
+static int floppy_resume(struct device *dev)
+{
+	int fdc;
+	int saved_drive;
+
+	saved_drive = current_drive;
+	for (fdc = 0; fdc < N_FDC; fdc++)
+		if (fdc_state[fdc].address != -1)
+			user_reset_fdc(REVDRIVE(fdc, 0), FD_RESET_ALWAYS, false);
+	set_fdc(saved_drive);
+	return 0;
+}
+
+static const struct dev_pm_ops floppy_pm_ops = {
+	.resume = floppy_resume,
+	.restore = floppy_resume,
+};
+
+static struct platform_driver floppy_driver = {
+	.driver = {
+		   .name = "floppy",
+		   .pm = &floppy_pm_ops,
+	},
+};
+
+static const struct blk_mq_ops floppy_mq_ops = {
+	.queue_rq = floppy_queue_rq,
+};
+
+static struct platform_device floppy_device[N_DRIVE];
+static bool registered[N_DRIVE];
+
+static bool floppy_available(int drive)
+{
+	if (!(allowed_drive_mask & (1 << drive)))
+		return false;
+	if (fdc_state[FDC(drive)].version == FDC_NONE)
+		return false;
+	return true;
+}
+
+static int floppy_alloc_disk(unsigned int drive, unsigned int type)
+{
+	struct gendisk *disk;
+
+	disk = blk_mq_alloc_disk(&tag_sets[drive], NULL);
+	if (IS_ERR(disk))
+		return PTR_ERR(disk);
+
+	blk_queue_max_hw_sectors(disk->queue, 64);
+	disk->major = FLOPPY_MAJOR;
+	disk->first_minor = TOMINOR(drive) | (type << 2);
+	disk->minors = 1;
+	disk->fops = &floppy_fops;
+	disk->flags |= GENHD_FL_NO_PART;
+	disk->events = DISK_EVENT_MEDIA_CHANGE;
+	if (type)
+		sprintf(disk->disk_name, "fd%d_type%d", drive, type);
+	else
+		sprintf(disk->disk_name, "fd%d", drive);
+	/* to be cleaned up... */
+	disk->private_data = (void *)(long)drive;
+	disk->flags |= GENHD_FL_REMOVABLE;
+
+	disks[drive][type] = disk;
+	return 0;
+}
+
+static DEFINE_MUTEX(floppy_probe_lock);
+
+static void floppy_probe(dev_t dev)
+{
+	unsigned int drive = (MINOR(dev) & 3) | ((MINOR(dev) & 0x80) >> 5);
+	unsigned int type = (MINOR(dev) >> 2) & 0x1f;
+
+	if (drive >= N_DRIVE || !floppy_available(drive) ||
+	    type >= ARRAY_SIZE(floppy_type))
+		return;
+
+	mutex_lock(&floppy_probe_lock);
+	if (disks[drive][type])
+		goto out;
+	if (floppy_alloc_disk(drive, type))
+		goto out;
+	if (add_disk(disks[drive][type]))
+		goto cleanup_disk;
+out:
+	mutex_unlock(&floppy_probe_lock);
+	return;
+
+cleanup_disk:
+	put_disk(disks[drive][type]);
+	disks[drive][type] = NULL;
+	mutex_unlock(&floppy_probe_lock);
+}
+
+static int __init do_floppy_init(void)
+{
+	int i, unit, drive, err;
+
+	set_debugt();
+	interruptjiffies = resultjiffies = jiffies;
+
+#if defined(CONFIG_PPC)
+	if (check_legacy_ioport(FDC1))
+		return -ENODEV;
+#endif
+
+	raw_cmd = NULL;
+
+	floppy_wq = alloc_ordered_workqueue("floppy", 0);
+	if (!floppy_wq)
+		return -ENOMEM;
+
+	for (drive = 0; drive < N_DRIVE; drive++) {
+		memset(&tag_sets[drive], 0, sizeof(tag_sets[drive]));
+		tag_sets[drive].ops = &floppy_mq_ops;
+		tag_sets[drive].nr_hw_queues = 1;
+		tag_sets[drive].nr_maps = 1;
+		tag_sets[drive].queue_depth = 2;
+		tag_sets[drive].numa_node = NUMA_NO_NODE;
+		tag_sets[drive].flags = BLK_MQ_F_SHOULD_MERGE;
+		err = blk_mq_alloc_tag_set(&tag_sets[drive]);
+		if (err)
+			goto out_put_disk;
+
+		err = floppy_alloc_disk(drive, 0);
+		if (err) {
+			blk_mq_free_tag_set(&tag_sets[drive]);
+			goto out_put_disk;
+		}
+
+		timer_setup(&motor_off_timer[drive], motor_off_callback, 0);
+	}
+
+	err = __register_blkdev(FLOPPY_MAJOR, "fd", floppy_probe);
+	if (err)
+		goto out_put_disk;
+
+	err = platform_driver_register(&floppy_driver);
+	if (err)
+		goto out_unreg_blkdev;
+
+	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");
+	config_types();
+
+	for (i = 0; i < N_FDC; i++) {
+		memset(&fdc_state[i], 0, sizeof(*fdc_state));
+		fdc_state[i].dtr = -1;
+		fdc_state[i].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
+			fdc_state[i].version = FDC_82072A;
+#endif
+	}
+
+	use_virtual_dma = can_use_virtual_dma & 1;
+	fdc_state[0].address = FDC1;
+	if (fdc_state[0].address == -1) {
+		cancel_delayed_work(&fd_timeout);
+		err = -ENODEV;
+		goto out_unreg_driver;
+	}
+#if N_FDC > 1
+	fdc_state[1].address = FDC2;
+#endif
+
+	current_fdc = 0;	/* reset fdc in case of unexpected interrupt */
+	err = floppy_grab_irq_and_dma();
+	if (err) {
+		cancel_delayed_work(&fd_timeout);
+		err = -EBUSY;
+		goto out_unreg_driver;
+	}
+
+	/* initialise drive state */
+	for (drive = 0; drive < N_DRIVE; drive++) {
+		memset(&drive_state[drive], 0, sizeof(drive_state[drive]));
+		memset(&write_errors[drive], 0, sizeof(write_errors[drive]));
+		set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[drive].flags);
+		set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags);
+		set_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
+		drive_state[drive].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_state[i].driver_version = FD_DRIVER_VERSION;
+		for (unit = 0; unit < 4; unit++)
+			fdc_state[i].track[unit] = 0;
+		if (fdc_state[i].address == -1)
+			continue;
+		fdc_state[i].rawcmd = 2;
+		if (user_reset_fdc(REVDRIVE(i, 0), FD_RESET_ALWAYS, false)) {
+			/* free ioports reserved by floppy_grab_irq_and_dma() */
+			floppy_release_regions(i);
+			fdc_state[i].address = -1;
+			fdc_state[i].version = FDC_NONE;
+			continue;
+		}
+		/* Try to determine the floppy controller type */
+		fdc_state[i].version = get_fdc_version(i);
+		if (fdc_state[i].version == FDC_NONE) {
+			/* free ioports reserved by floppy_grab_irq_and_dma() */
+			floppy_release_regions(i);
+			fdc_state[i].address = -1;
+			continue;
+		}
+		if (can_use_virtual_dma == 2 &&
+		    fdc_state[i].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(REVDRIVE(i, 0), FD_RESET_ALWAYS, false);
+	}
+	current_fdc = 0;
+	cancel_delayed_work(&fd_timeout);
+	current_drive = 0;
+	initialized = true;
+	if (have_no_fdc) {
+		DPRINT("no floppy controllers found\n");
+		err = have_no_fdc;
+		goto out_release_dma;
+	}
+
+	for (drive = 0; drive < N_DRIVE; drive++) {
+		if (!floppy_available(drive))
+			continue;
+
+		floppy_device[drive].name = floppy_device_name;
+		floppy_device[drive].id = drive;
+		floppy_device[drive].dev.release = floppy_device_release;
+		floppy_device[drive].dev.groups = floppy_dev_groups;
+
+		err = platform_device_register(&floppy_device[drive]);
+		if (err)
+			goto out_remove_drives;
+
+		registered[drive] = true;
+
+		err = device_add_disk(&floppy_device[drive].dev,
+				      disks[drive][0], NULL);
+		if (err)
+			goto out_remove_drives;
+	}
+
+	return 0;
+
+out_remove_drives:
+	while (drive--) {
+		if (floppy_available(drive)) {
+			del_gendisk(disks[drive][0]);
+			if (registered[drive])
+				platform_device_unregister(&floppy_device[drive]);
+		}
+	}
+out_release_dma:
+	if (atomic_read(&usage_count))
+		floppy_release_irq_and_dma();
+out_unreg_driver:
+	platform_driver_unregister(&floppy_driver);
+out_unreg_blkdev:
+	unregister_blkdev(FLOPPY_MAJOR, "fd");
+out_put_disk:
+	destroy_workqueue(floppy_wq);
+	for (drive = 0; drive < N_DRIVE; drive++) {
+		if (!disks[drive][0])
+			break;
+		del_timer_sync(&motor_off_timer[drive]);
+		put_disk(disks[drive][0]);
+		blk_mq_free_tag_set(&tag_sets[drive]);
+	}
+	return err;
+}
+
+#ifndef MODULE
+static __init void floppy_async_init(void *data, async_cookie_t cookie)
+{
+	do_floppy_init();
+}
+#endif
+
+static int __init floppy_init(void)
+{
+#ifdef MODULE
+	return do_floppy_init();
+#else
+	/* Don't hold up the bootup by the floppy initialization */
+	async_schedule(floppy_async_init, NULL);
+	return 0;
+#endif
+}
+
+static const struct io_region {
+	int offset;
+	int size;
+} io_regions[] = {
+	{ 2, 1 },
+	/* address + 3 is sometimes reserved by pnp bios for motherboard */
+	{ 4, 2 },
+	/* address + 6 is reserved, and may be taken by IDE.
+	 * Unfortunately, Adaptec doesn't know this :-(, */
+	{ 7, 1 },
+};
+
+static void floppy_release_allocated_regions(int fdc, const struct io_region *p)
+{
+	while (p != io_regions) {
+		p--;
+		release_region(fdc_state[fdc].address + p->offset, p->size);
+	}
+}
+
+#define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)]))
+
+static int floppy_request_regions(int fdc)
+{
+	const struct io_region *p;
+
+	for (p = io_regions; p < ARRAY_END(io_regions); p++) {
+		if (!request_region(fdc_state[fdc].address + p->offset,
+				    p->size, "floppy")) {
+			DPRINT("Floppy io-port 0x%04lx in use\n",
+			       fdc_state[fdc].address + p->offset);
+			floppy_release_allocated_regions(fdc, p);
+			return -EBUSY;
+		}
+	}
+	return 0;
+}
+
+static void floppy_release_regions(int fdc)
+{
+	floppy_release_allocated_regions(fdc, ARRAY_END(io_regions));
+}
+
+static int floppy_grab_irq_and_dma(void)
+{
+	int fdc;
+
+	if (atomic_inc_return(&usage_count) > 1)
+		return 0;
+
+	/*
+	 * We might have scheduled a free_irq(), wait it to
+	 * drain first:
+	 */
+	flush_workqueue(floppy_wq);
+
+	if (fd_request_irq()) {
+		DPRINT("Unable to grab IRQ%d for the floppy driver\n",
+		       FLOPPY_IRQ);
+		atomic_dec(&usage_count);
+		return -1;
+	}
+	if (fd_request_dma()) {
+		DPRINT("Unable to grab DMA%d for the floppy driver\n",
+		       FLOPPY_DMA);
+		if (can_use_virtual_dma & 2)
+			use_virtual_dma = can_use_virtual_dma = 1;
+		if (!(can_use_virtual_dma & 1)) {
+			fd_free_irq();
+			atomic_dec(&usage_count);
+			return -1;
+		}
+	}
+
+	for (fdc = 0; fdc < N_FDC; fdc++) {
+		if (fdc_state[fdc].address != -1) {
+			if (floppy_request_regions(fdc))
+				goto cleanup;
+		}
+	}
+	for (fdc = 0; fdc < N_FDC; fdc++) {
+		if (fdc_state[fdc].address != -1) {
+			reset_fdc_info(fdc, 1);
+			fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR);
+		}
+	}
+
+	set_dor(0, ~0, 8);	/* avoid immediate interrupt */
+
+	for (fdc = 0; fdc < N_FDC; fdc++)
+		if (fdc_state[fdc].address != -1)
+			fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR);
+	/*
+	 * The driver will try and free resources and relies on us
+	 * to know if they were allocated or not.
+	 */
+	current_fdc = 0;
+	irqdma_allocated = 1;
+	return 0;
+cleanup:
+	fd_free_irq();
+	fd_free_dma();
+	while (--fdc >= 0)
+		floppy_release_regions(fdc);
+	current_fdc = 0;
+	atomic_dec(&usage_count);
+	return -1;
+}
+
+static void floppy_release_irq_and_dma(void)
+{
+	int fdc;
+#ifndef __sparc__
+	int drive;
+#endif
+	long tmpsize;
+	unsigned long tmpaddr;
+
+	if (!atomic_dec_and_test(&usage_count))
+		return;
+
+	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
+
+	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);
+	}
+#ifndef __sparc__
+	for (drive = 0; drive < N_FDC * 4; drive++)
+		if (timer_pending(motor_off_timer + drive))
+			pr_info("motor off timer %d still active\n", drive);
+#endif
+
+	if (delayed_work_pending(&fd_timeout))
+		pr_info("floppy timer still active:%s\n", timeout_message);
+	if (delayed_work_pending(&fd_timer))
+		pr_info("auxiliary floppy timer still active\n");
+	if (work_pending(&floppy_work))
+		pr_info("work still pending\n");
+	for (fdc = 0; fdc < N_FDC; fdc++)
+		if (fdc_state[fdc].address != -1)
+			floppy_release_regions(fdc);
+}
+
+#ifdef MODULE
+
+static char *floppy;
+
+static void __init parse_floppy_cfg_string(char *cfg)
+{
+	char *ptr;
+
+	while (*cfg) {
+		ptr = cfg;
+		while (*cfg && *cfg != ' ' && *cfg != '\t')
+			cfg++;
+		if (*cfg) {
+			*cfg = '\0';
+			cfg++;
+		}
+		if (*ptr)
+			floppy_setup(ptr);
+	}
+}
+
+static int __init floppy_module_init(void)
+{
+	if (floppy)
+		parse_floppy_cfg_string(floppy);
+	return floppy_init();
+}
+module_init(floppy_module_init);
+
+static void __exit floppy_module_exit(void)
+{
+	int drive, i;
+
+	unregister_blkdev(FLOPPY_MAJOR, "fd");
+	platform_driver_unregister(&floppy_driver);
+
+	destroy_workqueue(floppy_wq);
+
+	for (drive = 0; drive < N_DRIVE; drive++) {
+		del_timer_sync(&motor_off_timer[drive]);
+
+		if (floppy_available(drive)) {
+			for (i = 0; i < ARRAY_SIZE(floppy_type); i++) {
+				if (disks[drive][i])
+					del_gendisk(disks[drive][i]);
+			}
+			if (registered[drive])
+				platform_device_unregister(&floppy_device[drive]);
+		}
+		for (i = 0; i < ARRAY_SIZE(floppy_type); i++) {
+			if (disks[drive][i])
+				put_disk(disks[drive][i]);
+		}
+		blk_mq_free_tag_set(&tag_sets[drive]);
+	}
+
+	cancel_delayed_work_sync(&fd_timeout);
+	cancel_delayed_work_sync(&fd_timer);
+
+	if (atomic_read(&usage_count))
+		floppy_release_irq_and_dma();
+
+	/* eject disk, if any */
+	fd_eject(0);
+}
+
+module_exit(floppy_module_exit);
+
+module_param(floppy, charp, 0);
+module_param(FLOPPY_IRQ, int, 0);
+module_param(FLOPPY_DMA, int, 0);
+MODULE_AUTHOR("Alain L. Knaff");
+MODULE_LICENSE("GPL");
+
+/* This doesn't actually get used other than for module information */
+static const struct pnp_device_id floppy_pnpids[] = {
+	{"PNP0700", 0},
+	{}
+};
+
+MODULE_DEVICE_TABLE(pnp, floppy_pnpids);
+
+#else
+
+__setup("floppy=", floppy_setup);
+module_init(floppy_init)
+#endif
+
+MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);