floppy.c 118.0 KB
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/*
 *  linux/drivers/block/floppy.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *  Copyright (C) 1993, 1994  Alain Knaff
 *  Copyright (C) 1998 Alan Cox
 */
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/*
 * 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.
 */

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/*
 * 1998/1/21 -- Richard Gooch <rgooch@atnf.csiro.au> -- devfs support
 */

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/*
 * 1998/05/07 -- Russell King -- More portability cleanups; moved definition of
 * interrupt and dma channel to asm/floppy.h. Cleaned up some formatting &
 * use of '0' for NULL.
 */

/*
 * 1998/06/07 -- Alan Cox -- Merged the 2.0.34 fixes for resource allocation
 * failures.
 */

/*
 * 1998/09/20 -- David Weinehall -- Added slow-down code for buggy PS/2-drives.
 */

/*
 * 1999/08/13 -- Paul Slootman -- floppy stopped working on Alpha after 24
 * days, 6 hours, 32 minutes and 32 seconds (i.e. MAXINT jiffies; ints were
 * being used to store jiffies, which are unsigned longs).
 */

/*
 * 2000/08/28 -- Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 * - get rid of check_region
 * - s/suser/capable/
 */

/*
 * 2001/08/26 -- Paul Gortmaker - fix insmod oops on machines with no
 * floppy controller (lingering task on list after module is gone... boom.)
 */

/*
 * 2002/02/07 -- Anton Altaparmakov - Fix io ports reservation to correct range
 * (0x3f2-0x3f5, 0x3f7). This fix is a bit of a hack but the proper fix
 * requires many non-obvious changes in arch dependent code.
 */

/* 2003/07/28 -- Daniele Bellucci <bellucda@tiscali.it>.
 * Better audit of register_blkdev.
 */

#define FLOPPY_SANITY_CHECK
#undef  FLOPPY_SILENT_DCL_CLEAR

#define REALLY_SLOW_IO

#define DEBUGT 2
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#define DCL_DEBUG		/* debug disk change line */
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#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


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/* do print messages for unexpected interrupts */
static int print_unex = 1;
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#define FDPATCHES
#include <linux/fdreg.h>
#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>
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#include <linux/jiffies.h>
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#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>
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#include <linux/platform_device.h>
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#include <linux/mod_devicetable.h>
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#include <linux/buffer_head.h>	/* for invalidate_buffers() */
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#include <linux/mutex.h>
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#include <linux/io.h>
#include <linux/uaccess.h>
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/*
 * PS/2 floppies have much slower step rates than regular floppies.
 * It's been recommended that take about 1/4 of the default speed
 * in some more extreme cases.
 */
static int slow_floppy;

#include <asm/dma.h>
#include <asm/irq.h>
#include <asm/system.h>

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;
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irqreturn_t floppy_interrupt(int irq, void *dev_id);
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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/blkdev.h>
#include <linux/blkpg.h>
#include <linux/cdrom.h>	/* for the compatibility eject ioctl */
#include <linux/completion.h>

static struct request *current_req;
static struct request_queue *floppy_queue;
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static void do_fd_request(struct request_queue *q);
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#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
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#define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL, get_order(size))
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#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 */
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	pr_info("DMA memory shortage. Temporarily falling back on virtual DMA\n");
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	*addr = (char *)nodma_mem_alloc(l);
#else
	return;
#endif
}

/* End dma memory related stuff */

static unsigned long fake_change;
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static bool initialized;
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#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 */
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	/* reverse mapping from unit and fdc to drive */
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#define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))

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#define DP	(&drive_params[current_drive])
#define DRS	(&drive_state[current_drive])
#define DRWE	(&write_errors[current_drive])
#define FDCS	(&fdc_state[fdc])
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#define UDP	(&drive_params[drive])
#define UDRS	(&drive_state[drive])
#define UDRWE	(&write_errors[drive])
#define UFDCS	(&fdc_state[FDC(drive)])
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#define DPRINT(format, args...) \
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	pr_info("floppy%d: " format, current_drive, ##args)
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#define PH_HEAD(floppy, head) (((((floppy)->stretch & 2) >> 1) ^ head) << 2)
#define STRETCH(floppy)	((floppy)->stretch & FD_STRETCH)

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/* read/write */
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#define COMMAND		(raw_cmd->cmd[0])
#define DR_SELECT	(raw_cmd->cmd[1])
#define TRACK		(raw_cmd->cmd[2])
#define HEAD		(raw_cmd->cmd[3])
#define SECTOR		(raw_cmd->cmd[4])
#define SIZECODE	(raw_cmd->cmd[5])
#define SECT_PER_TRACK	(raw_cmd->cmd[6])
#define GAP		(raw_cmd->cmd[7])
#define SIZECODE2	(raw_cmd->cmd[8])
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#define NR_RW 9

/* format */
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#define F_SIZECODE	(raw_cmd->cmd[2])
#define F_SECT_PER_TRACK (raw_cmd->cmd[3])
#define F_GAP		(raw_cmd->cmd[4])
#define F_FILL		(raw_cmd->cmd[5])
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#define NR_F 6

/*
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 * Maximum disk size (in kilobytes).
 * This default is used whenever the current disk size is unknown.
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 * [Now it is rather a minimum]
 */
#define MAX_DISK_SIZE 4		/* 3984 */

/*
 * globals used by 'result()'
 */
#define MAX_REPLIES 16
static unsigned char reply_buffer[MAX_REPLIES];
static int inr;			/* size of reply buffer, when called from interrupt */
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#define ST0		(reply_buffer[0])
#define ST1		(reply_buffer[1])
#define ST2		(reply_buffer[2])
#define ST3		(reply_buffer[0])	/* result of GETSTATUS */
#define R_TRACK		(reply_buffer[3])
#define R_HEAD		(reply_buffer[4])
#define R_SECTOR	(reply_buffer[5])
#define R_SIZECODE	(reply_buffer[6])

#define SEL_DLY		(2 * HZ / 100)
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/*
 * this struct defines the different floppy drive types.
 */
static struct {
	struct floppy_drive_params params;
	const char *name;	/* name printed while booting */
} default_drive_params[] = {
/* NOTE: the time values in jiffies should be in msec!
 CMOS drive type
  |     Maximum data rate supported by drive type
  |     |   Head load time, msec
  |     |   |   Head unload time, msec (not used)
  |     |   |   |     Step rate interval, usec
  |     |   |   |     |       Time needed for spinup time (jiffies)
  |     |   |   |     |       |      Timeout for spinning down (jiffies)
  |     |   |   |     |       |      |   Spindown offset (where disk stops)
  |     |   |   |     |       |      |   |     Select delay
  |     |   |   |     |       |      |   |     |     RPS
  |     |   |   |     |       |      |   |     |     |    Max number of tracks
  |     |   |   |     |       |      |   |     |     |    |     Interrupt timeout
  |     |   |   |     |       |      |   |     |     |    |     |   Max nonintlv. sectors
  |     |   |   |     |       |      |   |     |     |    |     |   | -Max Errors- flags */
{{0,  500, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
      0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },

{{1,  300, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
      0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/

{{2,  500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
      0, { 2, 5, 6,23,10,20,12, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/

{{3,  250, 16, 16, 3000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
      0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/

{{4,  500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
      0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/

{{5, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
      0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/

{{6, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
      0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
/*    |  --autodetected formats---    |      |      |
 *    read_track                      |      |    Name printed when booting
 *				      |     Native format
 *	            Frequency of disk change checks */
};

static struct floppy_drive_params drive_params[N_DRIVE];
static struct floppy_drive_struct drive_state[N_DRIVE];
static struct floppy_write_errors write_errors[N_DRIVE];
static struct timer_list motor_off_timer[N_DRIVE];
static struct gendisk *disks[N_DRIVE];
static struct block_device *opened_bdev[N_DRIVE];
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static DEFINE_MUTEX(open_lock);
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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
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 * '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)).
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 */
/*
	    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"   */
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	{ 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  },	/* 30 800KB 3.5"    */
	{ 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
};

#define 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];

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static char floppy_device_name[] = "floppy";

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/*
 * 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. */
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#define FD_COMMAND_NONE		-1
#define FD_COMMAND_ERROR	2
#define FD_COMMAND_OKAY		3
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static volatile int command_status = FD_COMMAND_NONE;
static unsigned long fdc_busy;
static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
static DECLARE_WAIT_QUEUE_HEAD(command_done);

#define NO_SIGNAL (!interruptible || !signal_pending(current))

/* Errors during formatting are counted here. */
static int format_errors;

/* Format request descriptor. */
static struct format_descr format_req;

/*
 * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
 * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
 * H is head unload time (1=16ms, 2=32ms, etc)
 */

/*
 * Track buffer
 * Because these are written to by the DMA controller, they must
 * not contain a 64k byte boundary crossing, or data will be
 * corrupted/lost.
 */
static char *floppy_track_buffer;
static int max_buffer_sectors;

static int *errors;
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typedef void (*done_f)(int);
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static struct cont_t {
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	void (*interrupt)(void);
				/* this is called after the interrupt of the
				 * main command */
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	void (*redo)(void);	/* this is called to retry the operation */
	void (*error)(void);	/* this is called to tally an error */
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	done_f done;		/* this is called to say if the operation has
				 * succeeded/failed */
} *cont;

static void floppy_ready(void);
static void floppy_start(void);
static void process_fd_request(void);
static void recalibrate_floppy(void);
static void floppy_shutdown(unsigned long);

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static int floppy_request_regions(int);
static void floppy_release_regions(int);
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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);

/*
 * These are global variables, as that's the easiest way to give
 * information to interrupts. They are the data used for the current
 * request.
 */
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#define NO_TRACK	-1
#define NEED_1_RECAL	-2
#define NEED_2_RECAL	-3
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static int usage_count;

/* buffer related variables */
static int buffer_track = -1;
static int buffer_drive = -1;
static int buffer_min = -1;
static int buffer_max = -1;

/* fdc related variables, should end up in a struct */
static struct floppy_fdc_state fdc_state[N_FDC];
static int fdc;			/* current fdc */

static struct floppy_struct *_floppy = floppy_type;
static unsigned char current_drive;
static long current_count_sectors;
static unsigned char fsector_t;	/* sector in track */
static unsigned char in_sector_offset;	/* offset within physical sector,
					 * expressed in units of 512 bytes */

#ifndef fd_eject
static inline int fd_eject(int drive)
{
	return -EINVAL;
}
#endif

/*
 * Debugging
 * =========
 */
#ifdef DEBUGT
static long unsigned debugtimer;

static inline void set_debugt(void)
{
	debugtimer = jiffies;
}

static inline void debugt(const char *message)
{
	if (DP->flags & DEBUGT)
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		pr_info("%s dtime=%lu\n", message, jiffies - debugtimer);
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}
#else
static inline void set_debugt(void) { }
static inline void debugt(const char *message) { }
#endif /* DEBUGT */

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typedef void (*timeout_fn)(unsigned long);
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static DEFINE_TIMER(fd_timeout, floppy_shutdown, 0, 0);
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static const char *timeout_message;

#ifdef FLOPPY_SANITY_CHECK
static void is_alive(const char *message)
{
	/* this routine checks whether the floppy driver is "alive" */
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	if (test_bit(0, &fdc_busy) && command_status < 2 &&
	    !timer_pending(&fd_timeout)) {
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		DPRINT("timeout handler died: %s\n", message);
	}
}
#endif

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static void (*do_floppy)(void) = NULL;
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#ifdef FLOPPY_SANITY_CHECK

#define OLOGSIZE 20

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static void (*lasthandler)(void);
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static unsigned long interruptjiffies;
static unsigned long resultjiffies;
static int resultsize;
static unsigned long lastredo;

static struct output_log {
	unsigned char data;
	unsigned char status;
	unsigned long jiffies;
} output_log[OLOGSIZE];

static int output_log_pos;
#endif

#define current_reqD -1
#define MAXTIMEOUT -2

static void __reschedule_timeout(int drive, const char *message, int marg)
{
	if (drive == current_reqD)
		drive = current_drive;
	del_timer(&fd_timeout);
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	if (drive < 0 || drive >= N_DRIVE) {
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		fd_timeout.expires = jiffies + 20UL * HZ;
		drive = 0;
	} else
		fd_timeout.expires = jiffies + UDP->timeout;
	add_timer(&fd_timeout);
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	if (UDP->flags & FD_DEBUG)
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		DPRINT("reschedule timeout %s %d\n", message, marg);
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	timeout_message = message;
}

static void reschedule_timeout(int drive, const char *message, int marg)
{
	unsigned long flags;

	spin_lock_irqsave(&floppy_lock, flags);
	__reschedule_timeout(drive, message, marg);
	spin_unlock_irqrestore(&floppy_lock, flags);
}

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#define INFBOUND(a, b) (a) = max_t(int, a, b)
#define SUPBOUND(a, b) (a) = min_t(int, a, b)
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/*
 * 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);
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#ifdef FLOPPY_SANITY_CHECK
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	if (time_before(jiffies, UDRS->select_date + UDP->select_delay))
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		DPRINT("WARNING disk change called early\n");
	if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
	    (FDCS->dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
		DPRINT("probing disk change on unselected drive\n");
		DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive),
		       (unsigned int)FDCS->dor);
	}
#endif

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	debug_dcl(UDP->flags,
		  "checking disk change line for drive %d\n", drive);
	debug_dcl(UDP->flags, "jiffies=%lu\n", jiffies);
	debug_dcl(UDP->flags, "disk change line=%x\n", fd_inb(FD_DIR) & 0x80);
	debug_dcl(UDP->flags, "flags=%lx\n", UDRS->flags);

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	if (UDP->flags & FD_BROKEN_DCL)
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		return test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
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	if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80) {
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		set_bit(FD_VERIFY_BIT, &UDRS->flags);
					/* verify write protection */

		if (UDRS->maxblock)	/* mark it changed */
			set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
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		/* invalidate its geometry */
		if (UDRS->keep_data >= 0) {
			if ((UDP->flags & FTD_MSG) &&
			    current_type[drive] != NULL)
				DPRINT("Disk type is undefined after "
				       "disk change\n");
			current_type[drive] = NULL;
			floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1;
		}

		return 1;
	} else {
		UDRS->last_checked = jiffies;
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		clear_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
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	}
	return 0;
}

static inline int is_selected(int dor, int unit)
{
	return ((dor & (0x10 << unit)) && (dor & 3) == unit);
}

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static bool is_ready_state(int status)
{
	int state = status & (STATUS_READY | STATUS_DIR | STATUS_DMA);
	return state == STATUS_READY;
}

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static int set_dor(int fdc, char mask, char data)
{
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	unsigned char unit;
	unsigned char drive;
	unsigned char newdor;
	unsigned char olddor;
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	if (FDCS->address == -1)
		return -1;

	olddor = FDCS->dor;
	newdor = (olddor & mask) | data;
	if (newdor != olddor) {
		unit = olddor & 0x3;
		if (is_selected(olddor, unit) && !is_selected(newdor, unit)) {
			drive = REVDRIVE(fdc, unit);
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			debug_dcl(UDP->flags,
				  "calling disk change from set_dor\n");
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			disk_change(drive);
		}
		FDCS->dor = newdor;
		fd_outb(newdor, FD_DOR);

		unit = newdor & 0x3;
		if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
			drive = REVDRIVE(fdc, unit);
			UDRS->select_date = jiffies;
		}
	}
	return olddor;
}

static void twaddle(void)
{
	if (DP->select_delay)
		return;
	fd_outb(FDCS->dor & ~(0x10 << UNIT(current_drive)), FD_DOR);
	fd_outb(FDCS->dor, FD_DOR);
	DRS->select_date = jiffies;
}

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/*
 * Reset all driver information about the current fdc.
 * This is needed after a reset, and after a raw command.
 */
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static void reset_fdc_info(int mode)
{
	int drive;

	FDCS->spec1 = FDCS->spec2 = -1;
	FDCS->need_configure = 1;
	FDCS->perp_mode = 1;
	FDCS->rawcmd = 0;
	for (drive = 0; drive < N_DRIVE; drive++)
		if (FDC(drive) == fdc && (mode || UDRS->track != NEED_1_RECAL))
			UDRS->track = NEED_2_RECAL;
}

/* selects the fdc and drive, and enables the fdc's input/dma. */
static void set_fdc(int drive)
{
	if (drive >= 0 && drive < N_DRIVE) {
		fdc = FDC(drive);
		current_drive = drive;
	}
	if (fdc != 1 && fdc != 0) {
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		pr_info("bad fdc value\n");
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		return;
	}
	set_dor(fdc, ~0, 8);
#if N_FDC > 1
	set_dor(1 - fdc, ~8, 0);
#endif
	if (FDCS->rawcmd == 2)
		reset_fdc_info(1);
	if (fd_inb(FD_STATUS) != STATUS_READY)
		FDCS->reset = 1;
}

/* locks the driver */
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static int _lock_fdc(int drive, bool interruptible, int line)
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{
	if (!usage_count) {
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		pr_err("Trying to lock fdc while usage count=0 at line %d\n",
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		       line);
		return -1;
	}

	if (test_and_set_bit(0, &fdc_busy)) {
		DECLARE_WAITQUEUE(wait, current);
		add_wait_queue(&fdc_wait, &wait);

		for (;;) {
			set_current_state(TASK_INTERRUPTIBLE);

			if (!test_and_set_bit(0, &fdc_busy))
				break;

			schedule();

			if (!NO_SIGNAL) {
				remove_wait_queue(&fdc_wait, &wait);
				return -EINTR;
			}
		}

		set_current_state(TASK_RUNNING);
		remove_wait_queue(&fdc_wait, &wait);
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		flush_scheduled_work();
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	}
	command_status = FD_COMMAND_NONE;

	__reschedule_timeout(drive, "lock fdc", 0);
	set_fdc(drive);
	return 0;
}

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#define lock_fdc(drive, interruptible)			\
	_lock_fdc(drive, interruptible, __LINE__)
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/* unlocks the driver */
static inline void unlock_fdc(void)
{
	unsigned long flags;

	raw_cmd = NULL;
	if (!test_bit(0, &fdc_busy))
		DPRINT("FDC access conflict!\n");

	if (do_floppy)
		DPRINT("device interrupt still active at FDC release: %p!\n",
		       do_floppy);
	command_status = FD_COMMAND_NONE;
	spin_lock_irqsave(&floppy_lock, flags);
	del_timer(&fd_timeout);
	cont = NULL;
	clear_bit(0, &fdc_busy);
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	if (current_req || blk_peek_request(floppy_queue))
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		do_fd_request(floppy_queue);
	spin_unlock_irqrestore(&floppy_lock, flags);
	wake_up(&fdc_wait);
}

/* switches the motor off after a given timeout */
static void motor_off_callback(unsigned long nr)
{
	unsigned char mask = ~(0x10 << UNIT(nr));

	set_dor(FDC(nr), mask, 0);
}

/* schedules motor off */
static void floppy_off(unsigned int drive)
{
	unsigned long volatile delta;
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	int fdc = FDC(drive);
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	if (!(FDCS->dor & (0x10 << UNIT(drive))))
		return;

	del_timer(motor_off_timer + drive);

	/* make spindle stop in a position which minimizes spinup time
	 * next time */
	if (UDP->rps) {
		delta = jiffies - UDRS->first_read_date + HZ -
		    UDP->spindown_offset;
		delta = ((delta * UDP->rps) % HZ) / UDP->rps;
		motor_off_timer[drive].expires =
		    jiffies + UDP->spindown - delta;
	}
	add_timer(motor_off_timer + drive);
}

/*
 * cycle through all N_DRIVE floppy drives, for disk change testing.
 * stopping at current drive. This is done before any long operation, to
 * be sure to have up to date disk change information.
 */
static void scandrives(void)
{
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	int i;
	int drive;
	int saved_drive;
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	if (DP->select_delay)
		return;

	saved_drive = current_drive;
	for (i = 0; i < N_DRIVE; i++) {
		drive = (saved_drive + i + 1) % N_DRIVE;
		if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
			continue;	/* skip closed drives */
		set_fdc(drive);
		if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
		      (0x10 << UNIT(drive))))
			/* switch the motor off again, if it was off to
			 * begin with */
			set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
	}
	set_fdc(saved_drive);
}

static void empty(void)
{
}

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static DECLARE_WORK(floppy_work, NULL);
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static void schedule_bh(void (*handler)(void))
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{
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	PREPARE_WORK(&floppy_work, (work_func_t)handler);
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	schedule_work(&floppy_work);
}

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static DEFINE_TIMER(fd_timer, NULL, 0, 0);
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static void cancel_activity(void)
{
	unsigned long flags;

	spin_lock_irqsave(&floppy_lock, flags);
	do_floppy = NULL;
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	PREPARE_WORK(&floppy_work, (work_func_t)empty);
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	del_timer(&fd_timer);
	spin_unlock_irqrestore(&floppy_lock, flags);
}

/* this function makes sure that the disk stays in the drive during the
 * transfer */
static void fd_watchdog(void)
{
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	debug_dcl(DP->flags, "calling disk change from watchdog\n");
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	if (disk_change(current_drive)) {
		DPRINT("disk removed during i/o\n");
		cancel_activity();
		cont->done(0);
		reset_fdc();
	} else {
		del_timer(&fd_timer);
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		fd_timer.function = (timeout_fn)fd_watchdog;
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		fd_timer.expires = jiffies + HZ / 10;
		add_timer(&fd_timer);
	}
}

static void main_command_interrupt(void)
{
	del_timer(&fd_timer);
	cont->interrupt();
}

/* waits for a delay (spinup or select) to pass */
static int fd_wait_for_completion(unsigned long delay, timeout_fn function)
{
	if (FDCS->reset) {
		reset_fdc();	/* do the reset during sleep to win time
				 * if we don't need to sleep, it's a good
				 * occasion anyways */
		return 1;
	}

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	if (time_before(jiffies, delay)) {
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		del_timer(&fd_timer);
		fd_timer.function = function;
		fd_timer.expires = delay;
		add_timer(&fd_timer);
		return 1;
	}
	return 0;
}

static DEFINE_SPINLOCK(floppy_hlt_lock);
static int hlt_disabled;
static void floppy_disable_hlt(void)
{
	unsigned long flags;

	spin_lock_irqsave(&floppy_hlt_lock, flags);
	if (!hlt_disabled) {
		hlt_disabled = 1;
#ifdef HAVE_DISABLE_HLT
		disable_hlt();
#endif
	}
	spin_unlock_irqrestore(&floppy_hlt_lock, flags);
}

static void floppy_enable_hlt(void)
{
	unsigned long flags;

	spin_lock_irqsave(&floppy_hlt_lock, flags);
	if (hlt_disabled) {
		hlt_disabled = 0;
#ifdef HAVE_DISABLE_HLT
		enable_hlt();
#endif
	}
	spin_unlock_irqrestore(&floppy_hlt_lock, flags);
}

static void setup_DMA(void)
{
	unsigned long f;

#ifdef FLOPPY_SANITY_CHECK
	if (raw_cmd->length == 0) {
		int i;

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		pr_info("zero dma transfer size:");
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		for (i = 0; i < raw_cmd->cmd_count; i++)
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			pr_cont("%x,", raw_cmd->cmd[i]);
		pr_cont("\n");
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		cont->done(0);
		FDCS->reset = 1;
		return;
	}
	if (((unsigned long)raw_cmd->kernel_data) % 512) {
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		pr_info("non aligned address: %p\n", raw_cmd->kernel_data);
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		cont->done(0);
		FDCS->reset = 1;
		return;
	}
#endif
	f = claim_dma_lock();
	fd_disable_dma();
#ifdef fd_dma_setup
	if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
			 (raw_cmd->flags & FD_RAW_READ) ?
			 DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) {
		release_dma_lock(f);
		cont->done(0);
		FDCS->reset = 1;
		return;
	}
	release_dma_lock(f);
#else
	fd_clear_dma_ff();
	fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length);
	fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ?
			DMA_MODE_READ : DMA_MODE_WRITE);
	fd_set_dma_addr(raw_cmd->kernel_data);
	fd_set_dma_count(raw_cmd->length);
	virtual_dma_port = FDCS->address;
	fd_enable_dma();
	release_dma_lock(f);
#endif
	floppy_disable_hlt();
}

static void show_floppy(void);

/* waits until the fdc becomes ready */
static int wait_til_ready(void)
{
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	int status;
	int counter;

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	if (FDCS->reset)
		return -1;
	for (counter = 0; counter < 10000; counter++) {
		status = fd_inb(FD_STATUS);
		if (status & STATUS_READY)
			return status;
	}
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	if (initialized) {
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		DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
		show_floppy();
	}
	FDCS->reset = 1;
	return -1;
}

/* sends a command byte to the fdc */
static int output_byte(char byte)
{
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	int status = wait_til_ready();
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	if (status < 0)
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		return -1;
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	if (is_ready_state(status)) {
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		fd_outb(byte, FD_DATA);
#ifdef FLOPPY_SANITY_CHECK
		output_log[output_log_pos].data = byte;
		output_log[output_log_pos].status = status;
		output_log[output_log_pos].jiffies = jiffies;
		output_log_pos = (output_log_pos + 1) % OLOGSIZE;
#endif
		return 0;
	}
	FDCS->reset = 1;
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	if (initialized) {
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		DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
		       byte, fdc, status);
		show_floppy();
	}
	return -1;
}

/* gets the response from the fdc */
static int result(void)
{
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	int i;
	int status = 0;
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	for (i = 0; i < MAX_REPLIES; i++) {
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		status = wait_til_ready();
		if (status < 0)
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			break;
		status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
		if ((status & ~STATUS_BUSY) == STATUS_READY) {
#ifdef FLOPPY_SANITY_CHECK
			resultjiffies = jiffies;
			resultsize = i;
#endif
			return i;
		}
		if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
			reply_buffer[i] = fd_inb(FD_DATA);
		else
			break;
	}
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	if (initialized) {
		DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
		       fdc, status, i);
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		show_floppy();
	}
	FDCS->reset = 1;
	return -1;
}

#define MORE_OUTPUT -2
/* does the fdc need more output? */
static int need_more_output(void)
{
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	int status = wait_til_ready();
1230

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	if (status < 0)
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		return -1;
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	if (is_ready_state(status))
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		return MORE_OUTPUT;
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	return result();
}

/* Set perpendicular mode as required, based on data rate, if supported.
 * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
 */
static inline void perpendicular_mode(void)
{
	unsigned char perp_mode;

	if (raw_cmd->rate & 0x40) {
		switch (raw_cmd->rate & 3) {
		case 0:
			perp_mode = 2;
			break;
		case 3:
			perp_mode = 3;
			break;
		default:
			DPRINT("Invalid data rate for perpendicular mode!\n");
			cont->done(0);
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			FDCS->reset = 1;
					/*
					 * convenient way to return to
					 * redo without too much hassle
					 * (deep stack et al.)
					 */
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			return;
		}
	} else
		perp_mode = 0;

	if (FDCS->perp_mode == perp_mode)
		return;
	if (FDCS->version >= FDC_82077_ORIG) {
		output_byte(FD_PERPENDICULAR);
		output_byte(perp_mode);
		FDCS->perp_mode = perp_mode;
	} else if (perp_mode) {
		DPRINT("perpendicular mode not supported by this FDC.\n");
	}
}				/* perpendicular_mode */

static int fifo_depth = 0xa;
static int no_fifo;

static int fdc_configure(void)
{
	/* Turn on FIFO */
	output_byte(FD_CONFIGURE);
	if (need_more_output() != MORE_OUTPUT)
		return 0;
	output_byte(0);
	output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
	output_byte(0);		/* pre-compensation from track
				   0 upwards */
	return 1;
}

#define NOMINAL_DTR 500

/* Issue a "SPECIFY" command to set the step rate time, head unload time,
 * head load time, and DMA disable flag to values needed by floppy.
 *
 * The value "dtr" is the data transfer rate in Kbps.  It is needed
 * to account for the data rate-based scaling done by the 82072 and 82077
 * FDC types.  This parameter is ignored for other types of FDCs (i.e.
 * 8272a).
 *
 * Note that changing the data transfer rate has a (probably deleterious)
 * effect on the parameters subject to scaling for 82072/82077 FDCs, so
 * fdc_specify is called again after each data transfer rate
 * change.
 *
 * srt: 1000 to 16000 in microseconds
 * hut: 16 to 240 milliseconds
 * hlt: 2 to 254 milliseconds
 *
 * These values are rounded up to the next highest available delay time.
 */
static void fdc_specify(void)
{
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	unsigned char spec1;
	unsigned char spec2;
	unsigned long srt;
	unsigned long hlt;
	unsigned long hut;
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	unsigned long dtr = NOMINAL_DTR;
	unsigned long scale_dtr = NOMINAL_DTR;
	int hlt_max_code = 0x7f;
	int hut_max_code = 0xf;

	if (FDCS->need_configure && FDCS->version >= FDC_82072A) {
		fdc_configure();
		FDCS->need_configure = 0;
	}

	switch (raw_cmd->rate & 0x03) {
	case 3:
		dtr = 1000;
		break;
	case 1:
		dtr = 300;
		if (FDCS->version >= FDC_82078) {
			/* chose the default rate table, not the one
			 * where 1 = 2 Mbps */
			output_byte(FD_DRIVESPEC);
			if (need_more_output() == MORE_OUTPUT) {
				output_byte(UNIT(current_drive));
				output_byte(0xc0);
			}
		}
		break;
	case 2:
		dtr = 250;
		break;
	}

	if (FDCS->version >= FDC_82072) {
		scale_dtr = dtr;
		hlt_max_code = 0x00;	/* 0==256msec*dtr0/dtr (not linear!) */
		hut_max_code = 0x0;	/* 0==256msec*dtr0/dtr (not linear!) */
	}

	/* Convert step rate from microseconds to milliseconds and 4 bits */
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	srt = 16 - DIV_ROUND_UP(DP->srt * scale_dtr / 1000, NOMINAL_DTR);
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	if (slow_floppy)
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		srt = srt / 4;
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	SUPBOUND(srt, 0xf);
	INFBOUND(srt, 0);

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	hlt = DIV_ROUND_UP(DP->hlt * scale_dtr / 2, NOMINAL_DTR);
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	if (hlt < 0x01)
		hlt = 0x01;
	else if (hlt > 0x7f)
		hlt = hlt_max_code;

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	hut = DIV_ROUND_UP(DP->hut * scale_dtr / 16, NOMINAL_DTR);
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	if (hut < 0x1)
		hut = 0x1;
	else if (hut > 0xf)
		hut = hut_max_code;

	spec1 = (srt << 4) | hut;
	spec2 = (hlt << 1) | (use_virtual_dma & 1);

	/* If these parameters did not change, just return with success */
	if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
		/* Go ahead and set spec1 and spec2 */
		output_byte(FD_SPECIFY);
		output_byte(FDCS->spec1 = spec1);
		output_byte(FDCS->spec2 = spec2);
	}
}				/* fdc_specify */

/* Set the FDC's data transfer rate on behalf of the specified drive.
 * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
 * of the specify command (i.e. using the fdc_specify function).
 */
static int fdc_dtr(void)
{
	/* If data rate not already set to desired value, set it. */
	if ((raw_cmd->rate & 3) == FDCS->dtr)
		return 0;

	/* Set dtr */
	fd_outb(raw_cmd->rate & 3, FD_DCR);

	/* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
	 * need a stabilization period of several milliseconds to be
	 * enforced after data rate changes before R/W operations.
	 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
	 */
	FDCS->dtr = raw_cmd->rate & 3;
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	return fd_wait_for_completion(jiffies + 2UL * HZ / 100,
				      (timeout_fn)floppy_ready);
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}				/* fdc_dtr */

static void tell_sector(void)
{
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	pr_cont(": track %d, head %d, sector %d, size %d",
		R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
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}				/* tell_sector */

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static void print_errors(void)
{
	DPRINT("");
	if (ST0 & ST0_ECE) {
		pr_cont("Recalibrate failed!");
	} else if (ST2 & ST2_CRC) {
		pr_cont("data CRC error");
		tell_sector();
	} else if (ST1 & ST1_CRC) {
		pr_cont("CRC error");
		tell_sector();
	} else if ((ST1 & (ST1_MAM | ST1_ND)) ||
		   (ST2 & ST2_MAM)) {
		if (!probing) {
			pr_cont("sector not found");
			tell_sector();
		} else
			pr_cont("probe failed...");
	} else if (ST2 & ST2_WC) {	/* seek error */
		pr_cont("wrong cylinder");
	} else if (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",
			ST0, ST1, ST2);
		tell_sector();
	}
	pr_cont("\n");
}

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/*
 * OK, this error interpreting routine is called after a
 * DMA read/write has succeeded
 * or failed, so we check the results, and copy any buffers.
 * hhb: Added better error reporting.
 * ak: Made this into a separate routine.
 */
static int interpret_errors(void)
{
	char bad;

	if (inr != 7) {
		DPRINT("-- FDC reply error");
		FDCS->reset = 1;
		return 1;
	}

	/* check IC to find cause of interrupt */
	switch (ST0 & ST0_INTR) {
	case 0x40:		/* error occurred during command execution */
		if (ST1 & ST1_EOC)
			return 0;	/* occurs with pseudo-DMA */
		bad = 1;
		if (ST1 & ST1_WP) {
			DPRINT("Drive is write protected\n");
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			clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
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			cont->done(0);
			bad = 2;
		} else if (ST1 & ST1_ND) {
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			set_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
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		} else if (ST1 & ST1_OR) {
			if (DP->flags & FTD_MSG)
				DPRINT("Over/Underrun - retrying\n");
			bad = 0;
		} else if (*errors >= DP->max_errors.reporting) {
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			print_errors();
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		}
		if (ST2 & ST2_WC || ST2 & ST2_BC)
			/* wrong cylinder => recal */
			DRS->track = NEED_2_RECAL;
		return bad;
	case 0x80:		/* invalid command given */
		DPRINT("Invalid FDC command given!\n");
		cont->done(0);
		return 2;
	case 0xc0:
		DPRINT("Abnormal termination caused by polling\n");
		cont->error();
		return 2;
	default:		/* (0) Normal command termination */
		return 0;
	}
}

/*
 * This routine is called when everything should be correctly set up
 * for the transfer (i.e. floppy motor is on, the correct floppy is
 * selected, and the head is sitting on the right track).
 */
static void setup_rw_floppy(void)
{
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	int i;
	int r;
	int flags;
	int dflags;
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	unsigned long ready_date;
	timeout_fn function;

	flags = raw_cmd->flags;
	if (flags & (FD_RAW_READ | FD_RAW_WRITE))
		flags |= FD_RAW_INTR;

	if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
		ready_date = DRS->spinup_date + DP->spinup;
		/* If spinup will take a long time, rerun scandrives
		 * again just before spinup completion. Beware that
		 * after scandrives, we must again wait for selection.
		 */
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		if (time_after(ready_date, jiffies + DP->select_delay)) {
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			ready_date -= DP->select_delay;
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			function = (timeout_fn)floppy_start;
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		} else
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			function = (timeout_fn)setup_rw_floppy;
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		/* wait until the floppy is spinning fast enough */
		if (fd_wait_for_completion(ready_date, function))
			return;
	}
	dflags = DRS->flags;

	if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
		setup_DMA();

	if (flags & FD_RAW_INTR)
		do_floppy = main_command_interrupt;

	r = 0;
	for (i = 0; i < raw_cmd->cmd_count; i++)
		r |= output_byte(raw_cmd->cmd[i]);

	debugt("rw_command: ");

	if (r) {
		cont->error();
		reset_fdc();
		return;
	}

	if (!(flags & FD_RAW_INTR)) {
		inr = result();
		cont->interrupt();
	} else if (flags & FD_RAW_NEED_DISK)
		fd_watchdog();
}

static int blind_seek;

/*
 * This is the routine called after every seek (or recalibrate) interrupt
 * from the floppy controller.
 */
static void seek_interrupt(void)
{
	debugt("seek interrupt:");
	if (inr != 2 || (ST0 & 0xF8) != 0x20) {
		DPRINT("seek failed\n");
		DRS->track = NEED_2_RECAL;
		cont->error();
		cont->redo();
		return;
	}
	if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) {
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		debug_dcl(DP->flags,
			  "clearing NEWCHANGE flag because of effective seek\n");
		debug_dcl(DP->flags, "jiffies=%lu\n", jiffies);
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		clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
					/* effective seek */
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		DRS->select_date = jiffies;
	}
	DRS->track = ST1;
	floppy_ready();
}

static void check_wp(void)
{
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	if (test_bit(FD_VERIFY_BIT, &DRS->flags)) {
					/* check write protection */
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		output_byte(FD_GETSTATUS);
		output_byte(UNIT(current_drive));
		if (result() != 1) {
			FDCS->reset = 1;
			return;
		}
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		clear_bit(FD_VERIFY_BIT, &DRS->flags);
		clear_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
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		debug_dcl(DP->flags,
			  "checking whether disk is write protected\n");
		debug_dcl(DP->flags, "wp=%x\n", ST3 & 0x40);
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		if (!(ST3 & 0x40))
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			set_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
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		else
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			clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
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	}
}

static void seek_floppy(void)
{
	int track;

	blind_seek = 0;

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	debug_dcl(DP->flags, "calling disk change from seek\n");
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	if (!test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
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	    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.
		 */
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		set_bit(FD_DISK_CHANGED_BIT, &DRS->flags);
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		cont->done(0);
		cont->redo();
		return;
	}
	if (DRS->track <= NEED_1_RECAL) {
		recalibrate_floppy();
		return;
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	} else if (test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
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		   (raw_cmd->flags & FD_RAW_NEED_DISK) &&
		   (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
		/* we seek to clear the media-changed condition. Does anybody
		 * know a more elegant way, which works on all drives? */
		if (raw_cmd->track)
			track = raw_cmd->track - 1;
		else {
			if (DP->flags & FD_SILENT_DCL_CLEAR) {
				set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
				blind_seek = 1;
				raw_cmd->flags |= FD_RAW_NEED_SEEK;
			}
			track = 1;
		}
	} else {
		check_wp();
		if (raw_cmd->track != DRS->track &&
		    (raw_cmd->flags & FD_RAW_NEED_SEEK))
			track = raw_cmd->track;
		else {
			setup_rw_floppy();
			return;
		}
	}

	do_floppy = seek_interrupt;
	output_byte(FD_SEEK);
	output_byte(UNIT(current_drive));
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	if (output_byte(track) < 0) {
		reset_fdc();
		return;
	}
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	debugt("seek command:");
}

static void recal_interrupt(void)
{
	debugt("recal interrupt:");
	if (inr != 2)
		FDCS->reset = 1;
	else if (ST0 & ST0_ECE) {
		switch (DRS->track) {
		case NEED_1_RECAL:
			debugt("recal interrupt need 1 recal:");
			/* after a second recalibrate, we still haven't
			 * reached track 0. Probably no drive. Raise an
			 * error, as failing immediately might upset
			 * computers possessed by the Devil :-) */
			cont->error();
			cont->redo();
			return;
		case NEED_2_RECAL:
			debugt("recal interrupt need 2 recal:");
			/* If we already did a recalibrate,
			 * and we are not at track 0, this
			 * means we have moved. (The only way
			 * not to move at recalibration is to
			 * be already at track 0.) Clear the
			 * new change flag */
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			debug_dcl(DP->flags,
				  "clearing NEWCHANGE flag because of second recalibrate\n");
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			clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
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			DRS->select_date = jiffies;
			/* fall through */
		default:
			debugt("recal interrupt default:");
			/* Recalibrate moves the head by at
			 * most 80 steps. If after one
			 * recalibrate we don't have reached
			 * track 0, this might mean that we
			 * started beyond track 80.  Try
			 * again.  */
			DRS->track = NEED_1_RECAL;
			break;
		}
	} else
		DRS->track = ST1;
	floppy_ready();
}

static void print_result(char *message, int inr)
{
	int i;

	DPRINT("%s ", message);
	if (inr >= 0)
		for (i = 0; i < inr; i++)
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			pr_cont("repl[%d]=%x ", i, reply_buffer[i]);
	pr_cont("\n");
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}

/* interrupt handler. Note that this can be called externally on the Sparc */
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irqreturn_t floppy_interrupt(int irq, void *dev_id)
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{
	int do_print;
	unsigned long f;
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	void (*handler)(void) = do_floppy;
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	lasthandler = handler;
	interruptjiffies = jiffies;

	f = claim_dma_lock();
	fd_disable_dma();
	release_dma_lock(f);

	floppy_enable_hlt();
	do_floppy = NULL;
	if (fdc >= N_FDC || FDCS->address == -1) {
		/* we don't even know which FDC is the culprit */
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		pr_info("DOR0=%x\n", fdc_state[0].dor);
		pr_info("floppy interrupt on bizarre fdc %d\n", fdc);
		pr_info("handler=%p\n", handler);
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		is_alive("bizarre fdc");
		return IRQ_NONE;
	}

	FDCS->reset = 0;
	/* We have to clear the reset flag here, because apparently on boxes
	 * with level triggered interrupts (PS/2, Sparc, ...), it is needed to
	 * emit SENSEI's to clear the interrupt line. And FDCS->reset blocks the
	 * emission of the SENSEI's.
	 * It is OK to emit floppy commands because we are in an interrupt
	 * handler here, and thus we have to fear no interference of other
	 * activity.
	 */

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	do_print = !handler && print_unex && initialized;
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	inr = result();
	if (do_print)
		print_result("unexpected interrupt", inr);
	if (inr == 0) {
		int max_sensei = 4;
		do {
			output_byte(FD_SENSEI);
			inr = result();
			if (do_print)
				print_result("sensei", inr);
			max_sensei--;
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		} while ((ST0 & 0x83) != UNIT(current_drive) &&
			 inr == 2 && max_sensei);
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	}
	if (!handler) {
		FDCS->reset = 1;
		return IRQ_NONE;
	}
	schedule_bh(handler);
	is_alive("normal interrupt end");

	/* FIXME! Was it really for us? */
	return IRQ_HANDLED;
}

static void recalibrate_floppy(void)
{
	debugt("recalibrate floppy:");
	do_floppy = recal_interrupt;
	output_byte(FD_RECALIBRATE);
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	if (output_byte(UNIT(current_drive)) < 0)
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		reset_fdc();
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}

/*
 * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
 */
static void reset_interrupt(void)
{
	debugt("reset interrupt:");
	result();		/* get the status ready for set_fdc */
	if (FDCS->reset) {
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		pr_info("reset set in interrupt, calling %p\n", cont->error);
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		cont->error();	/* a reset just after a reset. BAD! */
	}
	cont->redo();
}

/*
 * reset is done by pulling bit 2 of DOR low for a while (old FDCs),
 * or by setting the self clearing bit 7 of STATUS (newer FDCs)
 */
static void reset_fdc(void)
{
	unsigned long flags;

	do_floppy = reset_interrupt;
	FDCS->reset = 0;
	reset_fdc_info(0);

	/* Pseudo-DMA may intercept 'reset finished' interrupt.  */
	/* Irrelevant for systems with true DMA (i386).          */

	flags = claim_dma_lock();
	fd_disable_dma();
	release_dma_lock(flags);

	if (FDCS->version >= FDC_82072A)
		fd_outb(0x80 | (FDCS->dtr & 3), FD_STATUS);
	else {
		fd_outb(FDCS->dor & ~0x04, FD_DOR);
		udelay(FD_RESET_DELAY);
		fd_outb(FDCS->dor, FD_DOR);
	}
}

static void show_floppy(void)
{
	int i;

1849 1850 1851 1852 1853 1854
	pr_info("\n");
	pr_info("floppy driver state\n");
	pr_info("-------------------\n");
	pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%p\n",
		jiffies, interruptjiffies, jiffies - interruptjiffies,
		lasthandler);
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#ifdef FLOPPY_SANITY_CHECK
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	pr_info("timeout_message=%s\n", timeout_message);
	pr_info("last output bytes:\n");
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	for (i = 0; i < OLOGSIZE; i++)
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		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);
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#endif

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	pr_info("status=%x\n", fd_inb(FD_STATUS));
	pr_info("fdc_busy=%lu\n", fdc_busy);
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	if (do_floppy)
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		pr_info("do_floppy=%p\n", do_floppy);
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	if (work_pending(&floppy_work))
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		pr_info("floppy_work.func=%p\n", floppy_work.func);
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	if (timer_pending(&fd_timer))
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		pr_info("fd_timer.function=%p\n", fd_timer.function);
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	if (timer_pending(&fd_timeout)) {
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		pr_info("timer_function=%p\n", fd_timeout.function);
		pr_info("expires=%lu\n", fd_timeout.expires - jiffies);
		pr_info("now=%lu\n", 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");
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}

static void floppy_shutdown(unsigned long data)
{
	unsigned long flags;

1893
	if (initialized)
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		show_floppy();
	cancel_activity();

	floppy_enable_hlt();

	flags = claim_dma_lock();
	fd_disable_dma();
	release_dma_lock(flags);

	/* avoid dma going to a random drive after shutdown */

1905
	if (initialized)
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		DPRINT("floppy timeout called\n");
	FDCS->reset = 1;
	if (cont) {
		cont->done(0);
		cont->redo();	/* this will recall reset when needed */
	} else {
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		pr_info("no cont in shutdown!\n");
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		process_fd_request();
	}
	is_alive("floppy shutdown");
}

/* start motor, check media-changed condition and write protection */
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static int start_motor(void (*function)(void))
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{
1921 1922
	int mask;
	int data;
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	mask = 0xfc;
	data = UNIT(current_drive);
	if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
		if (!(FDCS->dor & (0x10 << UNIT(current_drive)))) {
			set_debugt();
			/* no read since this drive is running */
			DRS->first_read_date = 0;
			/* note motor start time if motor is not yet running */
			DRS->spinup_date = jiffies;
			data |= (0x10 << UNIT(current_drive));
		}
	} else if (FDCS->dor & (0x10 << UNIT(current_drive)))
		mask &= ~(0x10 << UNIT(current_drive));

	/* starts motor and selects floppy */
	del_timer(motor_off_timer + current_drive);
	set_dor(fdc, mask, data);

	/* wait_for_completion also schedules reset if needed. */
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	return fd_wait_for_completion(DRS->select_date + DP->select_delay,
				      (timeout_fn)function);
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}

static void floppy_ready(void)
{
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	if (FDCS->reset) {
		reset_fdc();
		return;
	}
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	if (start_motor(floppy_ready))
		return;
	if (fdc_dtr())
		return;

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	debug_dcl(DP->flags, "calling disk change from floppy_ready\n");
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	if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
	    disk_change(current_drive) && !DP->select_delay)
1961 1962
		twaddle();	/* this clears the dcl on certain
				 * drive/controller combinations */
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#ifdef fd_chose_dma_mode
	if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) {
		unsigned long flags = claim_dma_lock();
		fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length);
		release_dma_lock(flags);
	}
#endif

	if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) {
		perpendicular_mode();
		fdc_specify();	/* must be done here because of hut, hlt ... */
		seek_floppy();
	} else {
		if ((raw_cmd->flags & FD_RAW_READ) ||
		    (raw_cmd->flags & FD_RAW_WRITE))
			fdc_specify();
		setup_rw_floppy();
	}
}

static void floppy_start(void)
{
	reschedule_timeout(current_reqD, "floppy start", 0);

	scandrives();
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	debug_dcl(DP->flags, "setting NEWCHANGE in floppy_start\n");
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	set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
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	floppy_ready();
}

/*
 * ========================================================================
 * here ends the bottom half. Exported routines are:
 * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
 * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
 * Initialization also uses output_byte, result, set_dor, floppy_interrupt
 * and set_dor.
 * ========================================================================
 */
/*
 * General purpose continuations.
 * ==============================
 */

static void do_wakeup(void)
{
	reschedule_timeout(MAXTIMEOUT, "do wakeup", 0);
	cont = NULL;
	command_status += 2;
	wake_up(&command_done);
}

static struct cont_t wakeup_cont = {
	.interrupt	= empty,
	.redo		= do_wakeup,
	.error		= empty,
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	.done		= (done_f)empty
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};

static struct cont_t intr_cont = {
	.interrupt	= empty,
	.redo		= process_fd_request,
	.error		= empty,
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	.done		= (done_f)empty
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};

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static int wait_til_done(void (*handler)(void), bool interruptible)
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{
	int ret;

	schedule_bh(handler);

	if (command_status < 2 && NO_SIGNAL) {
		DECLARE_WAITQUEUE(wait, current);

		add_wait_queue(&command_done, &wait);
		for (;;) {
			set_current_state(interruptible ?
					  TASK_INTERRUPTIBLE :
					  TASK_UNINTERRUPTIBLE);

			if (command_status >= 2 || !NO_SIGNAL)
				break;

			is_alive("wait_til_done");
			schedule();
		}

		set_current_state(TASK_RUNNING);
		remove_wait_queue(&command_done, &wait);
	}

	if (command_status < 2) {
		cancel_activity();
		cont = &intr_cont;
		reset_fdc();
		return -EINTR;
	}

	if (FDCS->reset)
		command_status = FD_COMMAND_ERROR;
	if (command_status == FD_COMMAND_OKAY)
		ret = 0;
	else
		ret = -EIO;
	command_status = FD_COMMAND_NONE;
	return ret;
}

static void generic_done(int result)
{
	command_status = result;
	cont = &wakeup_cont;
}

static void generic_success(void)
{
	cont->done(1);
}

static void generic_failure(void)
{
	cont->done(0);
}

static void success_and_wakeup(void)
{
	generic_success();
	cont->redo();
}

/*
 * formatting and rw support.
 * ==========================
 */

static int next_valid_format(void)
{
	int probed_format;

	probed_format = DRS->probed_format;
	while (1) {
		if (probed_format >= 8 || !DP->autodetect[probed_format]) {
			DRS->probed_format = 0;
			return 1;
		}
		if (floppy_type[DP->autodetect[probed_format]].sect) {
			DRS->probed_format = probed_format;
			return 0;
		}
		probed_format++;
	}
}

static void bad_flp_intr(void)
{
	int err_count;

	if (probing) {
		DRS->probed_format++;
		if (!next_valid_format())
			return;
	}
	err_count = ++(*errors);
	INFBOUND(DRWE->badness, err_count);
	if (err_count > DP->max_errors.abort)
		cont->done(0);
	if (err_count > DP->max_errors.reset)
		FDCS->reset = 1;
	else if (err_count > DP->max_errors.recal)
		DRS->track = NEED_2_RECAL;
}

static void set_floppy(int drive)
{
	int type = ITYPE(UDRS->fd_device);
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	if (type)
		_floppy = floppy_type + type;
	else
		_floppy = current_type[drive];
}

/*
 * formatting support.
 * ===================
 */
static void format_interrupt(void)
{
	switch (interpret_errors()) {
	case 1:
		cont->error();
	case 2:
		break;
	case 0:
		cont->done(1);
	}
	cont->redo();
}

#define CODE2SIZE (ssize = ((1 << SIZECODE) + 3) >> 2)
2165
#define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1))
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#define CT(x) ((x) | 0xc0)
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static void setup_format_params(int track)
{
2170 2171 2172 2173 2174
	int n;
	int il;
	int count;
	int head_shift;
	int track_shift;
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	struct fparm {
		unsigned char track, head, sect, size;
	} *here = (struct fparm *)floppy_track_buffer;

	raw_cmd = &default_raw_cmd;
	raw_cmd->track = track;

2182 2183
	raw_cmd->flags = (FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
			  FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK);
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	raw_cmd->rate = _floppy->rate & 0x43;
	raw_cmd->cmd_count = NR_F;
	COMMAND = FM_MODE(_floppy, FD_FORMAT);
	DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
	F_SIZECODE = FD_SIZECODE(_floppy);
	F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE;
	F_GAP = _floppy->fmt_gap;
	F_FILL = FD_FILL_BYTE;

	raw_cmd->kernel_data = floppy_track_buffer;
	raw_cmd->length = 4 * F_SECT_PER_TRACK;

	/* allow for about 30ms for data transport per track */
	head_shift = (F_SECT_PER_TRACK + 5) / 6;

	/* a ``cylinder'' is two tracks plus a little stepping time */
	track_shift = 2 * head_shift + 3;

	/* position of logical sector 1 on this track */
	n = (track_shift * format_req.track + head_shift * format_req.head)
	    % F_SECT_PER_TRACK;

	/* determine interleave */
	il = 1;
	if (_floppy->fmt_gap < 0x22)
		il++;

	/* initialize field */
	for (count = 0; count < F_SECT_PER_TRACK; ++count) {
		here[count].track = format_req.track;
		here[count].head = format_req.head;
		here[count].sect = 0;
		here[count].size = F_SIZECODE;
	}
	/* place logical sectors */
	for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
		here[n].sect = count;
		n = (n + il) % F_SECT_PER_TRACK;
		if (here[n].sect) {	/* sector busy, find next free sector */
			++n;
			if (n >= F_SECT_PER_TRACK) {
				n -= F_SECT_PER_TRACK;
				while (here[n].sect)
					++n;
			}
		}
	}
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	if (_floppy->stretch & FD_SECTBASEMASK) {
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		for (count = 0; count < F_SECT_PER_TRACK; count++)
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			here[count].sect += FD_SECTBASE(_floppy) - 1;
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	}
}

static void redo_format(void)
{
	buffer_track = -1;
	setup_format_params(format_req.track << STRETCH(_floppy));
	floppy_start();
	debugt("queue format request");
}

static struct cont_t format_cont = {
	.interrupt	= format_interrupt,
	.redo		= redo_format,
	.error		= bad_flp_intr,
	.done		= generic_done
};

static int do_format(int drive, struct format_descr *tmp_format_req)
{
	int ret;

2256
	if (lock_fdc(drive, true))
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		return -EINTR;

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	set_floppy(drive);
	if (!_floppy ||
	    _floppy->track > DP->tracks ||
	    tmp_format_req->track >= _floppy->track ||
	    tmp_format_req->head >= _floppy->head ||
	    (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
	    !_floppy->fmt_gap) {
		process_fd_request();
		return -EINVAL;
	}
	format_req = *tmp_format_req;
	format_errors = 0;
	cont = &format_cont;
	errors = &format_errors;
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	ret = wait_til_done(redo_format, true);
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	if (ret == -EINTR)
		return -EINTR;
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	process_fd_request();
	return ret;
}

/*
 * Buffer read/write and support
 * =============================
 */

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static void floppy_end_request(struct request *req, int error)
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{
	unsigned int nr_sectors = current_count_sectors;
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	unsigned int drive = (unsigned long)req->rq_disk->private_data;
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	/* current_count_sectors can be zero if transfer failed */
2291
	if (error)
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		nr_sectors = blk_rq_cur_sectors(req);
2293
	if (__blk_end_request(req, error, nr_sectors << 9))
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		return;

	/* We're done with the request */
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	floppy_off(drive);
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	current_req = NULL;
}

/* new request_done. Can handle physical sectors which are smaller than a
 * logical buffer */
static void request_done(int uptodate)
{
	struct request_queue *q = floppy_queue;
	struct request *req = current_req;
	unsigned long flags;
	int block;

	probing = 0;
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	reschedule_timeout(MAXTIMEOUT, "request done", uptodate);
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	if (!req) {
2314
		pr_info("floppy.c: no request in request_done\n");
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		return;
	}

	if (uptodate) {
		/* maintain values for invalidation on geometry
		 * change */
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		block = current_count_sectors + blk_rq_pos(req);
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		INFBOUND(DRS->maxblock, block);
		if (block > _floppy->sect)
			DRS->maxtrack = 1;

		/* unlock chained buffers */
		spin_lock_irqsave(q->queue_lock, flags);
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		floppy_end_request(req, 0);
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		spin_unlock_irqrestore(q->queue_lock, flags);
	} else {
		if (rq_data_dir(req) == WRITE) {
			/* record write error information */
			DRWE->write_errors++;
			if (DRWE->write_errors == 1) {
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				DRWE->first_error_sector = blk_rq_pos(req);
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				DRWE->first_error_generation = DRS->generation;
			}
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			DRWE->last_error_sector = blk_rq_pos(req);
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			DRWE->last_error_generation = DRS->generation;
		}
		spin_lock_irqsave(q->queue_lock, flags);
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		floppy_end_request(req, -EIO);
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		spin_unlock_irqrestore(q->queue_lock, flags);
	}
}

/* Interrupt handler evaluating the result of the r/w operation */
static void rw_interrupt(void)
{
2350 2351 2352 2353
	int eoc;
	int ssize;
	int heads;
	int nr_sectors;
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	if (R_HEAD >= 2) {
		/* some Toshiba floppy controllers occasionnally seem to
		 * return bogus interrupts after read/write operations, which
		 * can be recognized by a bad head number (>= 2) */
		return;
	}

	if (!DRS->first_read_date)
		DRS->first_read_date = jiffies;

	nr_sectors = 0;
	CODE2SIZE;

	if (ST1 & ST1_EOC)
		eoc = 1;
	else
		eoc = 0;

	if (COMMAND & 0x80)
		heads = 2;
	else
		heads = 1;

	nr_sectors = (((R_TRACK - TRACK) * heads +
		       R_HEAD - HEAD) * SECT_PER_TRACK +
		      R_SECTOR - SECTOR + eoc) << SIZECODE >> 2;

#ifdef FLOPPY_SANITY_CHECK
	if (nr_sectors / ssize >
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	    DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
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		DPRINT("long rw: %x instead of %lx\n",
		       nr_sectors, current_count_sectors);
2387 2388 2389 2390 2391 2392 2393
		pr_info("rs=%d s=%d\n", R_SECTOR, SECTOR);
		pr_info("rh=%d h=%d\n", R_HEAD, HEAD);
		pr_info("rt=%d t=%d\n", R_TRACK, TRACK);
		pr_info("heads=%d eoc=%d\n", heads, eoc);
		pr_info("spt=%d st=%d ss=%d\n",
			SECT_PER_TRACK, fsector_t, ssize);
		pr_info("in_sector_offset=%d\n", in_sector_offset);
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	}
#endif

	nr_sectors -= in_sector_offset;
	INFBOUND(nr_sectors, 0);
	SUPBOUND(current_count_sectors, nr_sectors);

	switch (interpret_errors()) {
	case 2:
		cont->redo();
		return;
	case 1:
		if (!current_count_sectors) {
			cont->error();
			cont->redo();
			return;
		}
		break;
	case 0:
		if (!current_count_sectors) {
			cont->redo();
			return;
		}
		current_type[current_drive] = _floppy;
		floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
		break;
	}

	if (probing) {
		if (DP->flags & FTD_MSG)
			DPRINT("Auto-detected floppy type %s in fd%d\n",
			       _floppy->name, current_drive);
		current_type[current_drive] = _floppy;
		floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
		probing = 0;
	}

	if (CT(COMMAND) != FD_READ ||
	    raw_cmd->kernel_data == current_req->buffer) {
		/* transfer directly from buffer */
		cont->done(1);
	} else if (CT(COMMAND) == FD_READ) {
		buffer_track = raw_cmd->track;
		buffer_drive = current_drive;
		INFBOUND(buffer_max, nr_sectors + fsector_t);
	}
	cont->redo();
}

/* Compute maximal contiguous buffer size. */
static int buffer_chain_size(void)
{
	struct bio_vec *bv;
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	int size;
	struct req_iterator iter;
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	char *base;

	base = bio_data(current_req->bio);
	size = 0;

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	rq_for_each_segment(bv, current_req, iter) {
		if (page_address(bv->bv_page) + bv->bv_offset != base + size)
			break;
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2458
		size += bv->bv_len;
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	}

	return size >> 9;
}

/* Compute the maximal transfer size */
static int transfer_size(int ssize, int max_sector, int max_size)
{
	SUPBOUND(max_sector, fsector_t + max_size);

	/* alignment */
	max_sector -= (max_sector % _floppy->sect) % ssize;

	/* transfer size, beginning not aligned */
	current_count_sectors = max_sector - fsector_t;

	return max_sector;
}

/*
 * Move data from/to the track buffer to/from the buffer cache.
 */
static void copy_buffer(int ssize, int max_sector, int max_sector_2)
{
	int remaining;		/* number of transferred 512-byte sectors */
	struct bio_vec *bv;
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	char *buffer;
	char *dma_buffer;
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	int size;
	struct req_iterator iter;
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	max_sector = transfer_size(ssize,
				   min(max_sector, max_sector_2),
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				   blk_rq_sectors(current_req));
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	if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2495
	    buffer_max > fsector_t + blk_rq_sectors(current_req))
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		current_count_sectors = min_t(int, buffer_max - fsector_t,
2497
					      blk_rq_sectors(current_req));
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	remaining = current_count_sectors << 9;
#ifdef FLOPPY_SANITY_CHECK
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	if (remaining > blk_rq_bytes(current_req) && CT(COMMAND) == FD_WRITE) {
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		DPRINT("in copy buffer\n");
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		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);
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	}
#endif

	buffer_max = max(max_sector, buffer_max);

	dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);

2518
	size = blk_rq_cur_bytes(current_req);
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2520 2521 2522
	rq_for_each_segment(bv, current_req, iter) {
		if (!remaining)
			break;
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2524 2525
		size = bv->bv_len;
		SUPBOUND(size, remaining);
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2527
		buffer = page_address(bv->bv_page) + bv->bv_offset;
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#ifdef FLOPPY_SANITY_CHECK
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		if (dma_buffer + size >
		    floppy_track_buffer + (max_buffer_sectors << 10) ||
		    dma_buffer < floppy_track_buffer) {
			DPRINT("buffer overrun in copy buffer %d\n",
2533 2534 2535 2536 2537
			       (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);
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			if (CT(COMMAND) == FD_READ)
2539
				pr_info("read\n");
2540
			if (CT(COMMAND) == FD_WRITE)
2541
				pr_info("write\n");
2542
			break;
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		}
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		if (((unsigned long)buffer) % 512)
			DPRINT("%p buffer not aligned\n", buffer);
#endif
		if (CT(COMMAND) == FD_READ)
			memcpy(buffer, dma_buffer, size);
		else
			memcpy(dma_buffer, buffer, size);

		remaining -= size;
		dma_buffer += size;
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	}
#ifdef FLOPPY_SANITY_CHECK
	if (remaining) {
		if (remaining > 0)
			max_sector -= remaining >> 9;
		DPRINT("weirdness: remaining %d\n", remaining >> 9);
	}
#endif
}

/* work around a bug in pseudo DMA
 * (on some FDCs) pseudo DMA does not stop when the CPU stops
 * sending data.  Hence we need a different way to signal the
 * transfer length:  We use SECT_PER_TRACK.  Unfortunately, this
 * does not work with MT, hence we can only transfer one head at
 * a time
 */
static void virtualdmabug_workaround(void)
{
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	int hard_sectors;
	int end_sector;
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	if (CT(COMMAND) == FD_WRITE) {
		COMMAND &= ~0x80;	/* switch off multiple track mode */

		hard_sectors = raw_cmd->length >> (7 + SIZECODE);
		end_sector = SECTOR + hard_sectors - 1;
#ifdef FLOPPY_SANITY_CHECK
		if (end_sector > SECT_PER_TRACK) {
2583 2584
			pr_info("too many sectors %d > %d\n",
				end_sector, SECT_PER_TRACK);
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			return;
		}
#endif
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		SECT_PER_TRACK = end_sector;
					/* make sure SECT_PER_TRACK
					 * points to end of transfer */
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	}
}

/*
 * 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;
2607 2608 2609 2610
	int max_sector;
	int max_size;
	int tracksize;
	int ssize;
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	if (max_buffer_sectors == 0) {
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		pr_info("VFS: Block I/O scheduled on unopened device\n");
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		return 0;
	}

	set_fdc((long)current_req->rq_disk->private_data);

	raw_cmd = &default_raw_cmd;
	raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
	    FD_RAW_NEED_SEEK;
	raw_cmd->cmd_count = NR_RW;
	if (rq_data_dir(current_req) == READ) {
		raw_cmd->flags |= FD_RAW_READ;
		COMMAND = FM_MODE(_floppy, FD_READ);
	} else if (rq_data_dir(current_req) == WRITE) {
		raw_cmd->flags |= FD_RAW_WRITE;
		COMMAND = FM_MODE(_floppy, FD_WRITE);
	} else {
		DPRINT("make_raw_rw_request: unknown command\n");
		return 0;
	}

	max_sector = _floppy->sect * _floppy->head;

2636 2637
	TRACK = (int)blk_rq_pos(current_req) / max_sector;
	fsector_t = (int)blk_rq_pos(current_req) % max_sector;
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	if (_floppy->track && TRACK >= _floppy->track) {
2639
		if (blk_rq_cur_sectors(current_req) & 1) {
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			current_count_sectors = 1;
			return 1;
		} else
			return 0;
	}
	HEAD = fsector_t / _floppy->sect;

2647
	if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
2648 2649
	     test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags)) &&
	    fsector_t < _floppy->sect)
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		max_sector = _floppy->sect;

	/* 2M disks have phantom sectors on the first track */
	if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)) {
		max_sector = 2 * _floppy->sect / 3;
		if (fsector_t >= max_sector) {
			current_count_sectors =
			    min_t(int, _floppy->sect - fsector_t,
2658
				  blk_rq_sectors(current_req));
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			return 1;
		}
		SIZECODE = 2;
	} else
		SIZECODE = FD_SIZECODE(_floppy);
	raw_cmd->rate = _floppy->rate & 0x43;
	if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2)
		raw_cmd->rate = 1;

	if (SIZECODE)
		SIZECODE2 = 0xff;
	else
		SIZECODE2 = 0x80;
	raw_cmd->track = TRACK << STRETCH(_floppy);
	DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD);
	GAP = _floppy->gap;
	CODE2SIZE;
	SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
	SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
2678
	    FD_SECTBASE(_floppy);
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	/* tracksize describes the size which can be filled up with sectors
	 * of size ssize.
	 */
	tracksize = _floppy->sect - _floppy->sect % ssize;
	if (tracksize < _floppy->sect) {
		SECT_PER_TRACK++;
		if (tracksize <= fsector_t % _floppy->sect)
			SECTOR--;

		/* if we are beyond tracksize, fill up using smaller sectors */
		while (tracksize <= fsector_t % _floppy->sect) {
			while (tracksize + ssize > _floppy->sect) {
				SIZECODE--;
				ssize >>= 1;
			}
			SECTOR++;
			SECT_PER_TRACK++;
			tracksize += ssize;
		}
		max_sector = HEAD * _floppy->sect + tracksize;
	} else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing) {
		max_sector = _floppy->sect;
	} else if (!HEAD && CT(COMMAND) == FD_WRITE) {
		/* for virtual DMA bug workaround */
		max_sector = _floppy->sect;
	}

	in_sector_offset = (fsector_t % _floppy->sect) % ssize;
	aligned_sector_t = fsector_t - in_sector_offset;
2709
	max_size = blk_rq_sectors(current_req);
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	if ((raw_cmd->track == buffer_track) &&
	    (current_drive == buffer_drive) &&
	    (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
		/* data already in track buffer */
		if (CT(COMMAND) == FD_READ) {
			copy_buffer(1, max_sector, buffer_max);
			return 1;
		}
2718
	} else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
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		if (CT(COMMAND) == FD_WRITE) {
2720 2721 2722 2723
			unsigned int sectors;

			sectors = fsector_t + blk_rq_sectors(current_req);
			if (sectors > ssize && sectors < ssize + ssize)
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				max_size = ssize + ssize;
			else
				max_size = ssize;
		}
		raw_cmd->flags &= ~FD_RAW_WRITE;
		raw_cmd->flags |= FD_RAW_READ;
		COMMAND = FM_MODE(_floppy, FD_READ);
	} else if ((unsigned long)current_req->buffer < MAX_DMA_ADDRESS) {
		unsigned long dma_limit;
		int direct, indirect;

		indirect =
		    transfer_size(ssize, max_sector,
				  max_buffer_sectors * 2) - fsector_t;

		/*
		 * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
		 * on a 64 bit machine!
		 */
		max_size = buffer_chain_size();
2744 2745
		dma_limit = (MAX_DMA_ADDRESS -
			     ((unsigned long)current_req->buffer)) >> 9;
2746
		if ((unsigned long)max_size > dma_limit)
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			max_size = dma_limit;
		/* 64 kb boundaries */
		if (CROSS_64KB(current_req->buffer, max_size << 9))
			max_size = (K_64 -
				    ((unsigned long)current_req->buffer) %
				    K_64) >> 9;
		direct = transfer_size(ssize, max_sector, max_size) - fsector_t;
		/*
		 * We try to read tracks, but if we get too many errors, we
		 * go back to reading just one sector at a time.
		 *
		 * This means we should be able to read a sector even if there
		 * are other bad sectors on this track.
		 */
		if (!direct ||
		    (indirect * 2 > direct * 3 &&
2763 2764 2765
		     *errors < DP->max_errors.read_track &&
		     ((!probing ||
		       (DP->read_track & (1 << DRS->probed_format)))))) {
2766
			max_size = blk_rq_sectors(current_req);
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		} else {
			raw_cmd->kernel_data = current_req->buffer;
			raw_cmd->length = current_count_sectors << 9;
			if (raw_cmd->length == 0) {
2771 2772
				DPRINT("zero dma transfer attempted from make_raw_request\n");
				DPRINT("indirect=%d direct=%d fsector_t=%d\n",
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				       indirect, direct, fsector_t);
				return 0;
			}
			virtualdmabug_workaround();
			return 2;
		}
	}

	if (CT(COMMAND) == FD_READ)
		max_size = max_sector;	/* unbounded */

	/* claim buffer track if needed */
	if (buffer_track != raw_cmd->track ||	/* bad track */
	    buffer_drive != current_drive ||	/* bad drive */
	    fsector_t > buffer_max ||
	    fsector_t < buffer_min ||
	    ((CT(COMMAND) == FD_READ ||
2790
	      (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
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	     max_sector > 2 * max_buffer_sectors + buffer_min &&
2792 2793
	     max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) {
		/* not enough space */
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		buffer_track = -1;
		buffer_drive = current_drive;
		buffer_max = buffer_min = aligned_sector_t;
	}
	raw_cmd->kernel_data = floppy_track_buffer +
2799
		((aligned_sector_t - buffer_min) << 9);
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	if (CT(COMMAND) == FD_WRITE) {
		/* copy write buffer to track buffer.
		 * if we get here, we know that the write
		 * is either aligned or the data already in the buffer
		 * (buffer will be overwritten) */
#ifdef FLOPPY_SANITY_CHECK
		if (in_sector_offset && buffer_track == -1)
			DPRINT("internal error offset !=0 on write\n");
#endif
		buffer_track = raw_cmd->track;
		buffer_drive = current_drive;
		copy_buffer(ssize, max_sector,
			    2 * max_buffer_sectors + buffer_min);
	} else
		transfer_size(ssize, max_sector,
			      2 * max_buffer_sectors + buffer_min -
			      aligned_sector_t);

	/* round up current_count_sectors to get dma xfer size */
	raw_cmd->length = in_sector_offset + current_count_sectors;
	raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
	raw_cmd->length <<= 9;
#ifdef FLOPPY_SANITY_CHECK
	if ((raw_cmd->length < current_count_sectors << 9) ||
	    (raw_cmd->kernel_data != current_req->buffer &&
	     CT(COMMAND) == FD_WRITE &&
	     (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
	      aligned_sector_t < buffer_min)) ||
	    raw_cmd->length % (128 << SIZECODE) ||
	    raw_cmd->length <= 0 || current_count_sectors <= 0) {
		DPRINT("fractionary current count b=%lx s=%lx\n",
		       raw_cmd->length, current_count_sectors);
		if (raw_cmd->kernel_data != current_req->buffer)
2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846
			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, SIZECODE);
		pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
			COMMAND, SECTOR, HEAD, 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);
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2847 2848 2849 2850 2851 2852 2853 2854 2855 2856
		return 0;
	}

	if (raw_cmd->kernel_data != current_req->buffer) {
		if (raw_cmd->kernel_data < floppy_track_buffer ||
		    current_count_sectors < 0 ||
		    raw_cmd->length < 0 ||
		    raw_cmd->kernel_data + raw_cmd->length >
		    floppy_track_buffer + (max_buffer_sectors << 10)) {
			DPRINT("buffer overrun in schedule dma\n");
2857 2858 2859 2860
			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);
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			if (CT(COMMAND) == FD_READ)
2862
				pr_info("read\n");
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2863
			if (CT(COMMAND) == FD_WRITE)
2864
				pr_info("write\n");
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2865 2866
			return 0;
		}
2867
	} else if (raw_cmd->length > blk_rq_bytes(current_req) ||
2868
		   current_count_sectors > blk_rq_sectors(current_req)) {
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		DPRINT("buffer overrun in direct transfer\n");
		return 0;
	} else if (raw_cmd->length < current_count_sectors << 9) {
		DPRINT("more sectors than bytes\n");
2873 2874
		pr_info("bytes=%ld\n", raw_cmd->length >> 9);
		pr_info("sectors=%ld\n", current_count_sectors);
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	}
	if (raw_cmd->length == 0) {
		DPRINT("zero dma transfer attempted from make_raw_request\n");
		return 0;
	}
#endif

	virtualdmabug_workaround();
	return 2;
}

static void redo_fd_request(void)
{
	int drive;
	int tmp;

	lastredo = jiffies;
	if (current_drive < N_DRIVE)
		floppy_off(current_drive);

2895 2896 2897 2898 2899 2900 2901 2902 2903 2904
do_request:
	if (!current_req) {
		struct request *req;

		spin_lock_irq(floppy_queue->queue_lock);
		req = blk_fetch_request(floppy_queue);
		spin_unlock_irq(floppy_queue->queue_lock);
		if (!req) {
			do_floppy = NULL;
			unlock_fdc();
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			return;
		}
2907 2908 2909 2910 2911
		current_req = req;
	}
	drive = (long)current_req->rq_disk->private_data;
	set_fdc(drive);
	reschedule_timeout(current_reqD, "redo fd request", 0);
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2913 2914 2915 2916
	set_floppy(drive);
	raw_cmd = &default_raw_cmd;
	raw_cmd->flags = 0;
	if (start_motor(redo_fd_request))
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		return;
2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944

	disk_change(current_drive);
	if (test_bit(current_drive, &fake_change) ||
	    test_bit(FD_DISK_CHANGED_BIT, &DRS->flags)) {
		DPRINT("disk absent or changed during operation\n");
		request_done(0);
		goto do_request;
	}
	if (!_floppy) {	/* Autodetection */
		if (!probing) {
			DRS->probed_format = 0;
			if (next_valid_format()) {
				DPRINT("no autodetectable formats\n");
				_floppy = NULL;
				request_done(0);
				goto do_request;
			}
		}
		probing = 1;
		_floppy = floppy_type + DP->autodetect[DRS->probed_format];
	} else
		probing = 0;
	errors = &(current_req->errors);
	tmp = make_raw_rw_request();
	if (tmp < 2) {
		request_done(tmp);
		goto do_request;
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	}
2946 2947 2948 2949 2950 2951

	if (test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags))
		twaddle();
	schedule_bh(floppy_start);
	debugt("queue fd request");
	return;
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}

static struct cont_t rw_cont = {
	.interrupt	= rw_interrupt,
	.redo		= redo_fd_request,
	.error		= bad_flp_intr,
	.done		= request_done
};

static void process_fd_request(void)
{
	cont = &rw_cont;
	schedule_bh(redo_fd_request);
}

2967
static void do_fd_request(struct request_queue *q)
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{
	if (max_buffer_sectors == 0) {
2970
		pr_info("VFS: do_fd_request called on non-open device\n");
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		return;
	}

	if (usage_count == 0) {
2975 2976 2977 2978 2979
		pr_info("warning: usage count=0, current_req=%p exiting\n",
			current_req);
		pr_info("sect=%ld type=%x flags=%x\n",
			(long)blk_rq_pos(current_req), current_req->cmd_type,
			current_req->cmd_flags);
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		return;
	}
	if (test_bit(0, &fdc_busy)) {
		/* fdc busy, this new request will be treated when the
		   current one is done */
		is_alive("do fd request, old request running");
		return;
	}
2988
	lock_fdc(MAXTIMEOUT, false);
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	process_fd_request();
	is_alive("do fd request");
}

static struct cont_t poll_cont = {
	.interrupt	= success_and_wakeup,
	.redo		= floppy_ready,
	.error		= generic_failure,
	.done		= generic_done
};

3000
static int poll_drive(bool interruptible, int flag)
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{
	/* 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;
3008
	debug_dcl(DP->flags, "setting NEWCHANGE in poll_drive\n");
3009
	set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
3010 3011

	return wait_til_done(floppy_ready, interruptible);
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}

/*
 * User triggered reset
 * ====================
 */

static void reset_intr(void)
{
3021
	pr_info("weird, reset interrupt called\n");
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}

static struct cont_t reset_cont = {
	.interrupt	= reset_intr,
	.redo		= success_and_wakeup,
	.error		= generic_failure,
	.done		= generic_done
};

3031
static int user_reset_fdc(int drive, int arg, bool interruptible)
L
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3032 3033 3034
{
	int ret;

3035 3036 3037
	if (lock_fdc(drive, interruptible))
		return -EINTR;

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	if (arg == FD_RESET_ALWAYS)
		FDCS->reset = 1;
	if (FDCS->reset) {
		cont = &reset_cont;
3042 3043 3044
		ret = wait_til_done(reset_fdc, interruptible);
		if (ret == -EINTR)
			return -EINTR;
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	}
	process_fd_request();
3047
	return 0;
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}

/*
 * 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;
}

3060 3061
static inline int fd_copyin(void __user *param, void *address,
			    unsigned long size)
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3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141
{
	return copy_from_user(address, param, size) ? -EFAULT : 0;
}

static inline const char *drive_name(int type, int drive)
{
	struct floppy_struct *floppy;

	if (type)
		floppy = floppy_type + type;
	else {
		if (UDP->native_format)
			floppy = floppy_type + UDP->native_format;
		else
			return "(null)";
	}
	if (floppy->name)
		return floppy->name;
	else
		return "(null)";
}

/* raw commands */
static void raw_cmd_done(int flag)
{
	int i;

	if (!flag) {
		raw_cmd->flags |= FD_RAW_FAILURE;
		raw_cmd->flags |= FD_RAW_HARDFAILURE;
	} else {
		raw_cmd->reply_count = inr;
		if (raw_cmd->reply_count > MAX_REPLIES)
			raw_cmd->reply_count = 0;
		for (i = 0; i < raw_cmd->reply_count; i++)
			raw_cmd->reply[i] = reply_buffer[i];

		if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
			unsigned long flags;
			flags = claim_dma_lock();
			raw_cmd->length = fd_get_dma_residue();
			release_dma_lock(flags);
		}

		if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
		    (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
			raw_cmd->flags |= FD_RAW_FAILURE;

		if (disk_change(current_drive))
			raw_cmd->flags |= FD_RAW_DISK_CHANGE;
		else
			raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
		if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
			motor_off_callback(current_drive);

		if (raw_cmd->next &&
		    (!(raw_cmd->flags & FD_RAW_FAILURE) ||
		     !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
		    ((raw_cmd->flags & FD_RAW_FAILURE) ||
		     !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
			raw_cmd = raw_cmd->next;
			return;
		}
	}
	generic_done(flag);
}

static struct cont_t raw_cmd_cont = {
	.interrupt	= success_and_wakeup,
	.redo		= floppy_start,
	.error		= generic_failure,
	.done		= raw_cmd_done
};

static inline int raw_cmd_copyout(int cmd, char __user *param,
				  struct floppy_raw_cmd *ptr)
{
	int ret;

	while (ptr) {
3142 3143 3144
		ret = copy_to_user((void __user *)param, ptr, sizeof(*ptr));
		if (ret)
			return -EFAULT;
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		param += sizeof(struct floppy_raw_cmd);
		if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3147 3148 3149
			if (ptr->length >= 0 &&
			    ptr->length <= ptr->buffer_length) {
				long length = ptr->buffer_length - ptr->length;
3150 3151 3152 3153
				ret = fd_copyout(ptr->data, ptr->kernel_data,
						 length);
				if (ret)
					return ret;
3154
			}
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		}
		ptr = ptr->next;
	}
	return 0;
}

static void raw_cmd_free(struct floppy_raw_cmd **ptr)
{
3163 3164
	struct floppy_raw_cmd *next;
	struct floppy_raw_cmd *this;
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3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193

	this = *ptr;
	*ptr = NULL;
	while (this) {
		if (this->buffer_length) {
			fd_dma_mem_free((unsigned long)this->kernel_data,
					this->buffer_length);
			this->buffer_length = 0;
		}
		next = this->next;
		kfree(this);
		this = next;
	}
}

static inline int raw_cmd_copyin(int cmd, char __user *param,
				 struct floppy_raw_cmd **rcmd)
{
	struct floppy_raw_cmd *ptr;
	int ret;
	int i;

	*rcmd = NULL;
	while (1) {
		ptr = (struct floppy_raw_cmd *)
		    kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
		if (!ptr)
			return -ENOMEM;
		*rcmd = ptr;
3194 3195 3196
		ret = copy_from_user(ptr, (void __user *)param, sizeof(*ptr));
		if (ret)
			return -EFAULT;
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		ptr->next = NULL;
		ptr->buffer_length = 0;
		param += sizeof(struct floppy_raw_cmd);
		if (ptr->cmd_count > 33)
			/* the command may now also take up the space
			 * initially intended for the reply & the
			 * reply count. Needed for long 82078 commands
			 * such as RESTORE, which takes ... 17 command
			 * bytes. Murphy's law #137: When you reserve
			 * 16 bytes for a structure, you'll one day
			 * discover that you really need 17...
			 */
			return -EINVAL;

		for (i = 0; i < 16; i++)
			ptr->reply[i] = 0;
		ptr->resultcode = 0;
		ptr->kernel_data = NULL;

		if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
			if (ptr->length <= 0)
				return -EINVAL;
			ptr->kernel_data =
			    (char *)fd_dma_mem_alloc(ptr->length);
			fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
			if (!ptr->kernel_data)
				return -ENOMEM;
			ptr->buffer_length = ptr->length;
		}
3226 3227 3228 3229 3230 3231
		if (ptr->flags & FD_RAW_WRITE) {
			ret = fd_copyin(ptr->data, ptr->kernel_data,
					ptr->length);
			if (ret)
				return ret;
		}
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3232 3233 3234 3235 3236 3237 3238 3239 3240 3241
		rcmd = &(ptr->next);
		if (!(ptr->flags & FD_RAW_MORE))
			return 0;
		ptr->rate &= 0x43;
	}
}

static int raw_cmd_ioctl(int cmd, void __user *param)
{
	struct floppy_raw_cmd *my_raw_cmd;
3242 3243 3244
	int drive;
	int ret2;
	int ret;
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3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272

	if (FDCS->rawcmd <= 1)
		FDCS->rawcmd = 1;
	for (drive = 0; drive < N_DRIVE; drive++) {
		if (FDC(drive) != fdc)
			continue;
		if (drive == current_drive) {
			if (UDRS->fd_ref > 1) {
				FDCS->rawcmd = 2;
				break;
			}
		} else if (UDRS->fd_ref) {
			FDCS->rawcmd = 2;
			break;
		}
	}

	if (FDCS->reset)
		return -EIO;

	ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
	if (ret) {
		raw_cmd_free(&my_raw_cmd);
		return ret;
	}

	raw_cmd = my_raw_cmd;
	cont = &raw_cmd_cont;
3273
	ret = wait_til_done(floppy_start, true);
3274
	debug_dcl(DP->flags, "calling disk change from raw_cmd ioctl\n");
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3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306

	if (ret != -EINTR && FDCS->reset)
		ret = -EIO;

	DRS->track = NO_TRACK;

	ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
	if (!ret)
		ret = ret2;
	raw_cmd_free(&my_raw_cmd);
	return ret;
}

static int invalidate_drive(struct block_device *bdev)
{
	/* invalidate the buffer track to force a reread */
	set_bit((long)bdev->bd_disk->private_data, &fake_change);
	process_fd_request();
	check_disk_change(bdev);
	return 0;
}

static inline int set_geometry(unsigned int cmd, struct floppy_struct *g,
			       int drive, int type, struct block_device *bdev)
{
	int cnt;

	/* sanity checking for parameters. */
	if (g->sect <= 0 ||
	    g->head <= 0 ||
	    g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
	    /* check if reserved bits are set */
3307
	    (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
L
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3308 3309 3310 3311
		return -EINVAL;
	if (type) {
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;
3312
		mutex_lock(&open_lock);
3313
		if (lock_fdc(drive, true)) {
J
Jiri Slaby 已提交
3314 3315 3316
			mutex_unlock(&open_lock);
			return -EINTR;
		}
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3317 3318 3319 3320 3321 3322 3323 3324 3325 3326
		floppy_type[type] = *g;
		floppy_type[type].name = "user format";
		for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
			floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] =
			    floppy_type[type].size + 1;
		process_fd_request();
		for (cnt = 0; cnt < N_DRIVE; cnt++) {
			struct block_device *bdev = opened_bdev[cnt];
			if (!bdev || ITYPE(drive_state[cnt].fd_device) != type)
				continue;
3327
			__invalidate_device(bdev);
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3328
		}
3329
		mutex_unlock(&open_lock);
L
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3330 3331
	} else {
		int oldStretch;
3332

3333
		if (lock_fdc(drive, true))
3334
			return -EINTR;
3335
		if (cmd != FDDEFPRM) {
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3336 3337
			/* notice a disk change immediately, else
			 * we lose our settings immediately*/
3338
			if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3339 3340
				return -EINTR;
		}
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3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358
		oldStretch = g->stretch;
		user_params[drive] = *g;
		if (buffer_drive == drive)
			SUPBOUND(buffer_max, user_params[drive].sect);
		current_type[drive] = &user_params[drive];
		floppy_sizes[drive] = user_params[drive].size;
		if (cmd == FDDEFPRM)
			DRS->keep_data = -1;
		else
			DRS->keep_data = 1;
		/* invalidation. Invalidate only when needed, i.e.
		 * when there are already sectors in the buffer cache
		 * whose number will change. This is useful, because
		 * mtools often changes the geometry of the disk after
		 * looking at the boot block */
		if (DRS->maxblock > user_params[drive].sect ||
		    DRS->maxtrack ||
		    ((user_params[drive].sect ^ oldStretch) &
3359
		     (FD_SWAPSIDES | FD_SECTBASEMASK)))
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3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404
			invalidate_drive(bdev);
		else
			process_fd_request();
	}
	return 0;
}

/* handle obsolete ioctl's */
static int ioctl_table[] = {
	FDCLRPRM,
	FDSETPRM,
	FDDEFPRM,
	FDGETPRM,
	FDMSGON,
	FDMSGOFF,
	FDFMTBEG,
	FDFMTTRK,
	FDFMTEND,
	FDSETEMSGTRESH,
	FDFLUSH,
	FDSETMAXERRS,
	FDGETMAXERRS,
	FDGETDRVTYP,
	FDSETDRVPRM,
	FDGETDRVPRM,
	FDGETDRVSTAT,
	FDPOLLDRVSTAT,
	FDRESET,
	FDGETFDCSTAT,
	FDWERRORCLR,
	FDWERRORGET,
	FDRAWCMD,
	FDEJECT,
	FDTWADDLE
};

static inline int normalize_ioctl(int *cmd, int *size)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
		if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
			*size = _IOC_SIZE(*cmd);
			*cmd = ioctl_table[i];
			if (*size > _IOC_SIZE(*cmd)) {
3405
				pr_info("ioctl not yet supported\n");
L
Linus Torvalds 已提交
3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418
				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 {
3419
		if (lock_fdc(drive, false))
3420
			return -EINTR;
3421
		if (poll_drive(false, 0) == -EINTR)
3422
			return -EINTR;
L
Linus Torvalds 已提交
3423 3424 3425 3426 3427 3428 3429 3430
		process_fd_request();
		*g = current_type[drive];
	}
	if (!*g)
		return -ENODEV;
	return 0;
}

3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447
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;
}

A
Al Viro 已提交
3448
static int fd_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
L
Linus Torvalds 已提交
3449 3450
		    unsigned long param)
{
A
Al Viro 已提交
3451
#define FD_IOCTL_ALLOWED (mode & (FMODE_WRITE|FMODE_WRITE_IOCTL))
L
Linus Torvalds 已提交
3452

A
Al Viro 已提交
3453
	int drive = (long)bdev->bd_disk->private_data;
3454 3455
	int type = ITYPE(UDRS->fd_device);
	int i;
L
Linus Torvalds 已提交
3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469
	int ret;
	int size;
	union inparam {
		struct floppy_struct g;	/* geometry */
		struct format_descr f;
		struct floppy_max_errors max_errors;
		struct floppy_drive_params dp;
	} inparam;		/* parameters coming from user space */
	const char *outparam;	/* parameters passed back to user space */

	/* convert compatibility eject ioctls into floppy eject ioctl.
	 * We do this in order to provide a means to eject floppy disks before
	 * installing the new fdutils package */
	if (cmd == CDROMEJECT ||	/* CD-ROM eject */
3470
	    cmd == 0x6470) {		/* SunOS floppy eject */
L
Linus Torvalds 已提交
3471 3472 3473 3474 3475
		DPRINT("obsolete eject ioctl\n");
		DPRINT("please use floppycontrol --eject\n");
		cmd = FDEJECT;
	}

3476
	if (!((cmd & 0xff00) == 0x0200))
L
Linus Torvalds 已提交
3477 3478
		return -EINVAL;

3479
	/* convert the old style command into a new style command */
3480 3481 3482
	ret = normalize_ioctl(&cmd, &size);
	if (ret)
		return ret;
3483

L
Linus Torvalds 已提交
3484 3485 3486 3487 3488
	/* permission checks */
	if (((cmd & 0x40) && !FD_IOCTL_ALLOWED) ||
	    ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
		return -EPERM;

3489 3490 3491
	if (WARN_ON(size < 0 || size > sizeof(inparam)))
		return -EINVAL;

L
Linus Torvalds 已提交
3492
	/* copyin */
3493
	memset(&inparam, 0, sizeof(inparam));
3494 3495 3496 3497 3498
	if (_IOC_DIR(cmd) & _IOC_WRITE) {
		ret = fd_copyin((void __user *)param, &inparam, size);
		if (ret)
			return ret;
	}
L
Linus Torvalds 已提交
3499

3500 3501 3502 3503 3504
	switch (cmd) {
	case FDEJECT:
		if (UDRS->fd_ref != 1)
			/* somebody else has this drive open */
			return -EBUSY;
3505
		if (lock_fdc(drive, true))
3506
			return -EINTR;
L
Linus Torvalds 已提交
3507

3508 3509 3510
		/* do the actual eject. Fails on
		 * non-Sparc architectures */
		ret = fd_eject(UNIT(drive));
L
Linus Torvalds 已提交
3511

3512 3513
		set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
		set_bit(FD_VERIFY_BIT, &UDRS->flags);
3514 3515 3516
		process_fd_request();
		return ret;
	case FDCLRPRM:
3517
		if (lock_fdc(drive, true))
3518
			return -EINTR;
3519 3520 3521 3522 3523 3524 3525 3526
		current_type[drive] = NULL;
		floppy_sizes[drive] = MAX_DISK_SIZE << 1;
		UDRS->keep_data = 0;
		return invalidate_drive(bdev);
	case FDSETPRM:
	case FDDEFPRM:
		return set_geometry(cmd, &inparam.g, drive, type, bdev);
	case FDGETPRM:
3527
		ret = get_floppy_geometry(drive, type,
3528
					  (struct floppy_struct **)
3529 3530 3531
					  &outparam);
		if (ret)
			return ret;
3532 3533 3534 3535 3536 3537 3538 3539
		break;
	case FDMSGON:
		UDP->flags |= FTD_MSG;
		return 0;
	case FDMSGOFF:
		UDP->flags &= ~FTD_MSG;
		return 0;
	case FDFMTBEG:
3540
		if (lock_fdc(drive, true))
3541
			return -EINTR;
3542
		if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3543
			return -EINTR;
3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556
		ret = UDRS->flags;
		process_fd_request();
		if (ret & FD_VERIFY)
			return -ENODEV;
		if (!(ret & FD_DISK_WRITABLE))
			return -EROFS;
		return 0;
	case FDFMTTRK:
		if (UDRS->fd_ref != 1)
			return -EBUSY;
		return do_format(drive, &inparam.f);
	case FDFMTEND:
	case FDFLUSH:
3557
		if (lock_fdc(drive, true))
3558
			return -EINTR;
3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579
		return invalidate_drive(bdev);
	case FDSETEMSGTRESH:
		UDP->max_errors.reporting = (unsigned short)(param & 0x0f);
		return 0;
	case FDGETMAXERRS:
		outparam = (const char *)&UDP->max_errors;
		break;
	case FDSETMAXERRS:
		UDP->max_errors = inparam.max_errors;
		break;
	case FDGETDRVTYP:
		outparam = drive_name(type, drive);
		SUPBOUND(size, strlen(outparam) + 1);
		break;
	case FDSETDRVPRM:
		*UDP = inparam.dp;
		break;
	case FDGETDRVPRM:
		outparam = (const char *)UDP;
		break;
	case FDPOLLDRVSTAT:
3580
		if (lock_fdc(drive, true))
3581
			return -EINTR;
3582
		if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3583
			return -EINTR;
3584 3585 3586 3587 3588 3589
		process_fd_request();
		/* fall through */
	case FDGETDRVSTAT:
		outparam = (const char *)UDRS;
		break;
	case FDRESET:
3590
		return user_reset_fdc(drive, (int)param, true);
3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601
	case FDGETFDCSTAT:
		outparam = (const char *)UFDCS;
		break;
	case FDWERRORCLR:
		memset(UDRWE, 0, sizeof(*UDRWE));
		return 0;
	case FDWERRORGET:
		outparam = (const char *)UDRWE;
		break;
	case FDRAWCMD:
		if (type)
L
Linus Torvalds 已提交
3602
			return -EINVAL;
3603
		if (lock_fdc(drive, true))
3604
			return -EINTR;
3605
		set_floppy(drive);
3606 3607 3608
		i = raw_cmd_ioctl(cmd, (void __user *)param);
		if (i == -EINTR)
			return -EINTR;
3609 3610 3611
		process_fd_request();
		return i;
	case FDTWADDLE:
3612
		if (lock_fdc(drive, true))
3613
			return -EINTR;
3614 3615 3616 3617 3618 3619
		twaddle();
		process_fd_request();
		return 0;
	default:
		return -EINVAL;
	}
L
Linus Torvalds 已提交
3620 3621 3622

	if (_IOC_DIR(cmd) & _IOC_READ)
		return fd_copyout((void __user *)param, outparam, size);
3623 3624

	return 0;
L
Linus Torvalds 已提交
3625 3626 3627 3628
}

static void __init config_types(void)
{
3629
	bool has_drive = false;
L
Linus Torvalds 已提交
3630 3631 3632 3633 3634 3635 3636 3637 3638 3639
	int drive;

	/* read drive info out of physical CMOS */
	drive = 0;
	if (!UDP->cmos)
		UDP->cmos = FLOPPY0_TYPE;
	drive = 1;
	if (!UDP->cmos && FLOPPY1_TYPE)
		UDP->cmos = FLOPPY1_TYPE;

3640
	/* FIXME: additional physical CMOS drive detection should go here */
L
Linus Torvalds 已提交
3641 3642 3643 3644 3645 3646 3647

	for (drive = 0; drive < N_DRIVE; drive++) {
		unsigned int type = UDP->cmos;
		struct floppy_drive_params *params;
		const char *name = NULL;
		static char temparea[32];

3648
		if (type < ARRAY_SIZE(default_drive_params)) {
L
Linus Torvalds 已提交
3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660
			params = &default_drive_params[type].params;
			if (type) {
				name = default_drive_params[type].name;
				allowed_drive_mask |= 1 << drive;
			} else
				allowed_drive_mask &= ~(1 << drive);
		} else {
			params = &default_drive_params[0].params;
			sprintf(temparea, "unknown type %d (usb?)", type);
			name = temparea;
		}
		if (name) {
3661 3662 3663 3664 3665 3666 3667
			const char *prepend;
			if (!has_drive) {
				prepend = "";
				has_drive = true;
				pr_info("Floppy drive(s):");
			} else {
				prepend = ",";
L
Linus Torvalds 已提交
3668
			}
3669 3670

			pr_cont("%s fd%d is %s", prepend, drive, name);
L
Linus Torvalds 已提交
3671 3672 3673
		}
		*UDP = *params;
	}
3674 3675 3676

	if (has_drive)
		pr_cont("\n");
L
Linus Torvalds 已提交
3677 3678
}

A
Al Viro 已提交
3679
static int floppy_release(struct gendisk *disk, fmode_t mode)
L
Linus Torvalds 已提交
3680
{
A
Al Viro 已提交
3681
	int drive = (long)disk->private_data;
L
Linus Torvalds 已提交
3682

3683
	mutex_lock(&open_lock);
L
Linus Torvalds 已提交
3684 3685 3686 3687 3688 3689 3690 3691
	if (UDRS->fd_ref < 0)
		UDRS->fd_ref = 0;
	else if (!UDRS->fd_ref--) {
		DPRINT("floppy_release with fd_ref == 0");
		UDRS->fd_ref = 0;
	}
	if (!UDRS->fd_ref)
		opened_bdev[drive] = NULL;
3692
	mutex_unlock(&open_lock);
3693

L
Linus Torvalds 已提交
3694 3695 3696 3697 3698 3699 3700 3701
	return 0;
}

/*
 * floppy_open check for aliasing (/dev/fd0 can be the same as
 * /dev/PS0 etc), and disallows simultaneous access to the same
 * drive with different device numbers.
 */
A
Al Viro 已提交
3702
static int floppy_open(struct block_device *bdev, fmode_t mode)
L
Linus Torvalds 已提交
3703
{
A
Al Viro 已提交
3704 3705
	int drive = (long)bdev->bd_disk->private_data;
	int old_dev, new_dev;
L
Linus Torvalds 已提交
3706 3707 3708 3709
	int try;
	int res = -EBUSY;
	char *tmp;

3710
	mutex_lock(&open_lock);
L
Linus Torvalds 已提交
3711
	old_dev = UDRS->fd_device;
A
Al Viro 已提交
3712
	if (opened_bdev[drive] && opened_bdev[drive] != bdev)
L
Linus Torvalds 已提交
3713 3714 3715
		goto out2;

	if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) {
3716 3717
		set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
		set_bit(FD_VERIFY_BIT, &UDRS->flags);
L
Linus Torvalds 已提交
3718 3719
	}

A
Al Viro 已提交
3720
	if (UDRS->fd_ref == -1 || (UDRS->fd_ref && (mode & FMODE_EXCL)))
L
Linus Torvalds 已提交
3721 3722
		goto out2;

A
Al Viro 已提交
3723
	if (mode & FMODE_EXCL)
L
Linus Torvalds 已提交
3724 3725 3726 3727
		UDRS->fd_ref = -1;
	else
		UDRS->fd_ref++;

A
Al Viro 已提交
3728
	opened_bdev[drive] = bdev;
L
Linus Torvalds 已提交
3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745

	res = -ENXIO;

	if (!floppy_track_buffer) {
		/* if opening an ED drive, reserve a big buffer,
		 * else reserve a small one */
		if ((UDP->cmos == 6) || (UDP->cmos == 5))
			try = 64;	/* Only 48 actually useful */
		else
			try = 32;	/* Only 24 actually useful */

		tmp = (char *)fd_dma_mem_alloc(1024 * try);
		if (!tmp && !floppy_track_buffer) {
			try >>= 1;	/* buffer only one side */
			INFBOUND(try, 16);
			tmp = (char *)fd_dma_mem_alloc(1024 * try);
		}
3746
		if (!tmp && !floppy_track_buffer)
L
Linus Torvalds 已提交
3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761
			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;
		}
	}

A
Al Viro 已提交
3762 3763 3764 3765
	new_dev = MINOR(bdev->bd_dev);
	UDRS->fd_device = new_dev;
	set_capacity(disks[drive], floppy_sizes[new_dev]);
	if (old_dev != -1 && old_dev != new_dev) {
L
Linus Torvalds 已提交
3766 3767 3768 3769 3770 3771 3772
		if (buffer_drive == drive)
			buffer_track = -1;
	}

	if (UFDCS->rawcmd == 1)
		UFDCS->rawcmd = 2;

A
Al Viro 已提交
3773 3774
	if (!(mode & FMODE_NDELAY)) {
		if (mode & (FMODE_READ|FMODE_WRITE)) {
L
Linus Torvalds 已提交
3775
			UDRS->last_checked = 0;
A
Al Viro 已提交
3776
			check_disk_change(bdev);
3777
			if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags))
L
Linus Torvalds 已提交
3778 3779 3780
				goto out;
		}
		res = -EROFS;
3781 3782
		if ((mode & FMODE_WRITE) &&
		    !test_bit(FD_DISK_WRITABLE_BIT, &UDRS->flags))
L
Linus Torvalds 已提交
3783 3784
			goto out;
	}
3785
	mutex_unlock(&open_lock);
L
Linus Torvalds 已提交
3786 3787 3788 3789 3790 3791 3792 3793 3794
	return 0;
out:
	if (UDRS->fd_ref < 0)
		UDRS->fd_ref = 0;
	else
		UDRS->fd_ref--;
	if (!UDRS->fd_ref)
		opened_bdev[drive] = NULL;
out2:
3795
	mutex_unlock(&open_lock);
L
Linus Torvalds 已提交
3796 3797 3798 3799 3800 3801 3802 3803 3804 3805
	return res;
}

/*
 * Check if the disk has been changed or if a change has been faked.
 */
static int check_floppy_change(struct gendisk *disk)
{
	int drive = (long)disk->private_data;

3806 3807
	if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
	    test_bit(FD_VERIFY_BIT, &UDRS->flags))
L
Linus Torvalds 已提交
3808 3809
		return 1;

3810
	if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) {
3811 3812
		lock_fdc(drive, false);
		poll_drive(false, 0);
L
Linus Torvalds 已提交
3813 3814 3815
		process_fd_request();
	}

3816 3817
	if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
	    test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
L
Linus Torvalds 已提交
3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829
	    test_bit(drive, &fake_change) ||
	    (!ITYPE(UDRS->fd_device) && !current_type[drive]))
		return 1;
	return 0;
}

/*
 * This implements "read block 0" for floppy_revalidate().
 * Needed for format autodetection, checking whether there is
 * a disk in the drive, and whether that disk is writable.
 */

3830
static void floppy_rb0_complete(struct bio *bio, int err)
L
Linus Torvalds 已提交
3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887
{
	complete((struct completion *)bio->bi_private);
}

static int __floppy_read_block_0(struct block_device *bdev)
{
	struct bio bio;
	struct bio_vec bio_vec;
	struct completion complete;
	struct page *page;
	size_t size;

	page = alloc_page(GFP_NOIO);
	if (!page) {
		process_fd_request();
		return -ENOMEM;
	}

	size = bdev->bd_block_size;
	if (!size)
		size = 1024;

	bio_init(&bio);
	bio.bi_io_vec = &bio_vec;
	bio_vec.bv_page = page;
	bio_vec.bv_len = size;
	bio_vec.bv_offset = 0;
	bio.bi_vcnt = 1;
	bio.bi_idx = 0;
	bio.bi_size = size;
	bio.bi_bdev = bdev;
	bio.bi_sector = 0;
	init_completion(&complete);
	bio.bi_private = &complete;
	bio.bi_end_io = floppy_rb0_complete;

	submit_bio(READ, &bio);
	generic_unplug_device(bdev_get_queue(bdev));
	process_fd_request();
	wait_for_completion(&complete);

	__free_page(page);

	return 0;
}

/* revalidate the floppy disk, i.e. trigger format autodetection by reading
 * the bootblock (block 0). "Autodetection" is also needed to check whether
 * there is a disk in the drive at all... Thus we also do it for fixed
 * geometry formats */
static int floppy_revalidate(struct gendisk *disk)
{
	int drive = (long)disk->private_data;
#define NO_GEOM (!current_type[drive] && !ITYPE(UDRS->fd_device))
	int cf;
	int res = 0;

3888 3889 3890
	if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
	    test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
	    test_bit(drive, &fake_change) || NO_GEOM) {
L
Linus Torvalds 已提交
3891
		if (usage_count == 0) {
3892
			pr_info("VFS: revalidate called on non-open device.\n");
L
Linus Torvalds 已提交
3893 3894
			return -EFAULT;
		}
3895
		lock_fdc(drive, false);
3896 3897
		cf = (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
		      test_bit(FD_VERIFY_BIT, &UDRS->flags));
L
Linus Torvalds 已提交
3898 3899 3900 3901 3902 3903 3904 3905 3906
		if (!(cf || test_bit(drive, &fake_change) || NO_GEOM)) {
			process_fd_request();	/*already done by another thread */
			return 0;
		}
		UDRS->maxblock = 0;
		UDRS->maxtrack = 0;
		if (buffer_drive == drive)
			buffer_track = -1;
		clear_bit(drive, &fake_change);
3907
		clear_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
L
Linus Torvalds 已提交
3908 3909 3910 3911 3912 3913 3914
		if (cf)
			UDRS->generation++;
		if (NO_GEOM) {
			/* auto-sensing */
			res = __floppy_read_block_0(opened_bdev[drive]);
		} else {
			if (cf)
3915
				poll_drive(false, FD_RAW_NEED_DISK);
L
Linus Torvalds 已提交
3916 3917 3918 3919 3920 3921 3922
			process_fd_request();
		}
	}
	set_capacity(disk, floppy_sizes[UDRS->fd_device]);
	return res;
}

3923
static const struct block_device_operations floppy_fops = {
3924
	.owner			= THIS_MODULE,
A
Al Viro 已提交
3925 3926 3927
	.open			= floppy_open,
	.release		= floppy_release,
	.locked_ioctl		= fd_ioctl,
3928 3929 3930
	.getgeo			= fd_getgeo,
	.media_changed		= check_floppy_change,
	.revalidate_disk	= floppy_revalidate,
L
Linus Torvalds 已提交
3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946
};

/*
 * Floppy Driver initialization
 * =============================
 */

/* Determine the floppy disk controller type */
/* This routine was written by David C. Niemi */
static char __init get_fdc_version(void)
{
	int r;

	output_byte(FD_DUMPREGS);	/* 82072 and better know DUMPREGS */
	if (FDCS->reset)
		return FDC_NONE;
3947 3948
	r = result();
	if (r <= 0x00)
L
Linus Torvalds 已提交
3949 3950
		return FDC_NONE;	/* No FDC present ??? */
	if ((r == 1) && (reply_buffer[0] == 0x80)) {
3951
		pr_info("FDC %d is an 8272A\n", fdc);
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3952 3953 3954
		return FDC_8272A;	/* 8272a/765 don't know DUMPREGS */
	}
	if (r != 10) {
3955 3956
		pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
			fdc, r);
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3957 3958 3959 3960
		return FDC_UNKNOWN;
	}

	if (!fdc_configure()) {
3961
		pr_info("FDC %d is an 82072\n", fdc);
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3962 3963 3964 3965 3966 3967 3968
		return FDC_82072;	/* 82072 doesn't know CONFIGURE */
	}

	output_byte(FD_PERPENDICULAR);
	if (need_more_output() == MORE_OUTPUT) {
		output_byte(0);
	} else {
3969
		pr_info("FDC %d is an 82072A\n", fdc);
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3970 3971 3972 3973 3974 3975
		return FDC_82072A;	/* 82072A as found on Sparcs. */
	}

	output_byte(FD_UNLOCK);
	r = result();
	if ((r == 1) && (reply_buffer[0] == 0x80)) {
3976
		pr_info("FDC %d is a pre-1991 82077\n", fdc);
3977
		return FDC_82077_ORIG;	/* Pre-1991 82077, doesn't know
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3978 3979 3980
					 * LOCK/UNLOCK */
	}
	if ((r != 1) || (reply_buffer[0] != 0x00)) {
3981 3982
		pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
			fdc, r);
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3983 3984 3985 3986 3987
		return FDC_UNKNOWN;
	}
	output_byte(FD_PARTID);
	r = result();
	if (r != 1) {
3988 3989
		pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n",
			fdc, r);
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3990 3991 3992
		return FDC_UNKNOWN;
	}
	if (reply_buffer[0] == 0x80) {
3993
		pr_info("FDC %d is a post-1991 82077\n", fdc);
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3994 3995 3996 3997 3998
		return FDC_82077;	/* Revised 82077AA passes all the tests */
	}
	switch (reply_buffer[0] >> 5) {
	case 0x0:
		/* Either a 82078-1 or a 82078SL running at 5Volt */
3999
		pr_info("FDC %d is an 82078.\n", fdc);
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		return FDC_82078;
	case 0x1:
4002
		pr_info("FDC %d is a 44pin 82078\n", fdc);
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4003 4004
		return FDC_82078;
	case 0x2:
4005
		pr_info("FDC %d is a S82078B\n", fdc);
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4006 4007
		return FDC_S82078B;
	case 0x3:
4008
		pr_info("FDC %d is a National Semiconductor PC87306\n", fdc);
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4009 4010
		return FDC_87306;
	default:
4011 4012
		pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
			fdc, reply_buffer[0] >> 5);
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4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123
		return FDC_82078_UNKN;
	}
}				/* get_fdc_version */

/* lilo configuration */

static void __init floppy_set_flags(int *ints, int param, int param2)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
		if (param)
			default_drive_params[i].params.flags |= param2;
		else
			default_drive_params[i].params.flags &= ~param2;
	}
	DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param);
}

static void __init daring(int *ints, int param, int param2)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
		if (param) {
			default_drive_params[i].params.select_delay = 0;
			default_drive_params[i].params.flags |=
			    FD_SILENT_DCL_CLEAR;
		} else {
			default_drive_params[i].params.select_delay =
			    2 * HZ / 100;
			default_drive_params[i].params.flags &=
			    ~FD_SILENT_DCL_CLEAR;
		}
	}
	DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken");
}

static void __init set_cmos(int *ints, int dummy, int dummy2)
{
	int current_drive = 0;

	if (ints[0] != 2) {
		DPRINT("wrong number of parameters for CMOS\n");
		return;
	}
	current_drive = ints[1];
	if (current_drive < 0 || current_drive >= 8) {
		DPRINT("bad drive for set_cmos\n");
		return;
	}
#if N_FDC > 1
	if (current_drive >= 4 && !FDC2)
		FDC2 = 0x370;
#endif
	DP->cmos = ints[2];
	DPRINT("setting CMOS code to %d\n", ints[2]);
}

static struct param_table {
	const char *name;
	void (*fn) (int *ints, int param, int param2);
	int *var;
	int def_param;
	int param2;
} config_params[] __initdata = {
	{"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
	{"all_drives", NULL, &allowed_drive_mask, 0xff, 0},	/* obsolete */
	{"asus_pci", NULL, &allowed_drive_mask, 0x33, 0},
	{"irq", NULL, &FLOPPY_IRQ, 6, 0},
	{"dma", NULL, &FLOPPY_DMA, 2, 0},
	{"daring", daring, NULL, 1, 0},
#if N_FDC > 1
	{"two_fdc", NULL, &FDC2, 0x370, 0},
	{"one_fdc", NULL, &FDC2, 0, 0},
#endif
	{"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL},
	{"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL},
	{"messages", floppy_set_flags, NULL, 1, FTD_MSG},
	{"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR},
	{"debug", floppy_set_flags, NULL, 1, FD_DEBUG},
	{"nodma", NULL, &can_use_virtual_dma, 1, 0},
	{"omnibook", NULL, &can_use_virtual_dma, 1, 0},
	{"yesdma", NULL, &can_use_virtual_dma, 0, 0},
	{"fifo_depth", NULL, &fifo_depth, 0xa, 0},
	{"nofifo", NULL, &no_fifo, 0x20, 0},
	{"usefifo", NULL, &no_fifo, 0, 0},
	{"cmos", set_cmos, NULL, 0, 0},
	{"slow", NULL, &slow_floppy, 1, 0},
	{"unexpected_interrupts", NULL, &print_unex, 1, 0},
	{"no_unexpected_interrupts", NULL, &print_unex, 0, 0},
	{"L40SX", NULL, &print_unex, 0, 0}

	EXTRA_FLOPPY_PARAMS
};

static int __init floppy_setup(char *str)
{
	int i;
	int param;
	int ints[11];

	str = get_options(str, ARRAY_SIZE(ints), ints);
	if (str) {
		for (i = 0; i < ARRAY_SIZE(config_params); i++) {
			if (strcmp(str, config_params[i].name) == 0) {
				if (ints[0])
					param = ints[1];
				else
					param = config_params[i].def_param;
				if (config_params[i].fn)
4124 4125 4126
					config_params[i].fn(ints, param,
							    config_params[i].
							    param2);
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4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139
				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++)
4140 4141
			pr_cont(" %s", config_params[i].name);
		pr_cont("\n");
L
Linus Torvalds 已提交
4142 4143
	} else
		DPRINT("botched floppy option\n");
4144
	DPRINT("Read Documentation/blockdev/floppy.txt\n");
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4145 4146 4147 4148 4149
	return 0;
}

static int have_no_fdc = -ENODEV;

4150 4151
static ssize_t floppy_cmos_show(struct device *dev,
				struct device_attribute *attr, char *buf)
4152
{
4153
	struct platform_device *p = to_platform_device(dev);
4154
	int drive;
4155

4156 4157
	drive = p->id;
	return sprintf(buf, "%X\n", UDP->cmos);
4158
}
4159 4160

DEVICE_ATTR(cmos, S_IRUGO, floppy_cmos_show, NULL);
4161

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4162 4163 4164 4165
static void floppy_device_release(struct device *dev)
{
}

F
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4166
static int floppy_resume(struct device *dev)
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Ondrej Zary 已提交
4167 4168 4169 4170 4171
{
	int fdc;

	for (fdc = 0; fdc < N_FDC; fdc++)
		if (FDCS->address != -1)
4172
			user_reset_fdc(-1, FD_RESET_ALWAYS, false);
O
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4173 4174 4175 4176

	return 0;
}

4177
static const struct dev_pm_ops floppy_pm_ops = {
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4178
	.resume = floppy_resume,
F
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4179 4180 4181 4182
	.restore = floppy_resume,
};

static struct platform_driver floppy_driver = {
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Ondrej Zary 已提交
4183
	.driver = {
4184 4185
		   .name = "floppy",
		   .pm = &floppy_pm_ops,
O
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4186 4187 4188
	},
};

4189
static struct platform_device floppy_device[N_DRIVE];
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4190 4191 4192 4193 4194 4195 4196 4197

static struct kobject *floppy_find(dev_t dev, int *part, void *data)
{
	int drive = (*part & 3) | ((*part & 0x80) >> 5);
	if (drive >= N_DRIVE ||
	    !(allowed_drive_mask & (1 << drive)) ||
	    fdc_state[FDC(drive)].version == FDC_NONE)
		return NULL;
4198
	if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type))
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4199 4200 4201 4202 4203 4204 4205 4206 4207 4208
		return NULL;
	*part = 0;
	return get_disk(disks[drive]);
}

static int __init floppy_init(void)
{
	int i, unit, drive;
	int err, dr;

4209
#if defined(CONFIG_PPC)
4210 4211 4212 4213
	if (check_legacy_ioport(FDC1))
		return -ENODEV;
#endif

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4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234
	raw_cmd = NULL;

	for (dr = 0; dr < N_DRIVE; dr++) {
		disks[dr] = alloc_disk(1);
		if (!disks[dr]) {
			err = -ENOMEM;
			goto out_put_disk;
		}

		disks[dr]->major = FLOPPY_MAJOR;
		disks[dr]->first_minor = TOMINOR(dr);
		disks[dr]->fops = &floppy_fops;
		sprintf(disks[dr]->disk_name, "fd%d", dr);

		init_timer(&motor_off_timer[dr]);
		motor_off_timer[dr].data = dr;
		motor_off_timer[dr].function = motor_off_callback;
	}

	err = register_blkdev(FLOPPY_MAJOR, "fd");
	if (err)
4235
		goto out_put_disk;
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4236

O
Ondrej Zary 已提交
4237 4238 4239 4240
	err = platform_driver_register(&floppy_driver);
	if (err)
		goto out_unreg_blkdev;

L
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4241 4242 4243
	floppy_queue = blk_init_queue(do_fd_request, &floppy_lock);
	if (!floppy_queue) {
		err = -ENOMEM;
O
Ondrej Zary 已提交
4244
		goto out_unreg_driver;
L
Linus Torvalds 已提交
4245
	}
4246
	blk_queue_max_hw_sectors(floppy_queue, 64);
L
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4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261

	blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
			    floppy_find, NULL, NULL);

	for (i = 0; i < 256; i++)
		if (ITYPE(i))
			floppy_sizes[i] = floppy_type[ITYPE(i)].size;
		else
			floppy_sizes[i] = MAX_DISK_SIZE << 1;

	reschedule_timeout(MAXTIMEOUT, "floppy init", MAXTIMEOUT);
	config_types();

	for (i = 0; i < N_FDC; i++) {
		fdc = i;
4262
		memset(FDCS, 0, sizeof(*FDCS));
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4263 4264 4265
		FDCS->dtr = -1;
		FDCS->dor = 0x4;
#if defined(__sparc__) || defined(__mc68000__)
4266
	/*sparcs/sun3x don't have a DOR reset which we can fall back on to */
L
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4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294
#ifdef __mc68000__
		if (MACH_IS_SUN3X)
#endif
			FDCS->version = FDC_82072A;
#endif
	}

	use_virtual_dma = can_use_virtual_dma & 1;
	fdc_state[0].address = FDC1;
	if (fdc_state[0].address == -1) {
		del_timer(&fd_timeout);
		err = -ENODEV;
		goto out_unreg_region;
	}
#if N_FDC > 1
	fdc_state[1].address = FDC2;
#endif

	fdc = 0;		/* reset fdc in case of unexpected interrupt */
	err = floppy_grab_irq_and_dma();
	if (err) {
		del_timer(&fd_timeout);
		err = -EBUSY;
		goto out_unreg_region;
	}

	/* initialise drive state */
	for (drive = 0; drive < N_DRIVE; drive++) {
4295 4296
		memset(UDRS, 0, sizeof(*UDRS));
		memset(UDRWE, 0, sizeof(*UDRWE));
4297 4298 4299
		set_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
		set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
		set_bit(FD_VERIFY_BIT, &UDRS->flags);
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4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318
		UDRS->fd_device = -1;
		floppy_track_buffer = NULL;
		max_buffer_sectors = 0;
	}
	/*
	 * Small 10 msec delay to let through any interrupt that
	 * initialization might have triggered, to not
	 * confuse detection:
	 */
	msleep(10);

	for (i = 0; i < N_FDC; i++) {
		fdc = i;
		FDCS->driver_version = FD_DRIVER_VERSION;
		for (unit = 0; unit < 4; unit++)
			FDCS->track[unit] = 0;
		if (FDCS->address == -1)
			continue;
		FDCS->rawcmd = 2;
4319
		if (user_reset_fdc(-1, FD_RESET_ALWAYS, false)) {
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4320
			/* free ioports reserved by floppy_grab_irq_and_dma() */
4321
			floppy_release_regions(fdc);
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4322 4323 4324 4325 4326 4327 4328 4329
			FDCS->address = -1;
			FDCS->version = FDC_NONE;
			continue;
		}
		/* Try to determine the floppy controller type */
		FDCS->version = get_fdc_version();
		if (FDCS->version == FDC_NONE) {
			/* free ioports reserved by floppy_grab_irq_and_dma() */
4330
			floppy_release_regions(fdc);
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4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341
			FDCS->address = -1;
			continue;
		}
		if (can_use_virtual_dma == 2 && FDCS->version < FDC_82072A)
			can_use_virtual_dma = 0;

		have_no_fdc = 0;
		/* Not all FDCs seem to be able to handle the version command
		 * properly, so force a reset for the standard FDC clones,
		 * to avoid interrupt garbage.
		 */
4342
		user_reset_fdc(-1, FD_RESET_ALWAYS, false);
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4343 4344 4345 4346
	}
	fdc = 0;
	del_timer(&fd_timeout);
	current_drive = 0;
4347
	initialized = true;
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4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358
	if (have_no_fdc) {
		DPRINT("no floppy controllers found\n");
		err = have_no_fdc;
		goto out_flush_work;
	}

	for (drive = 0; drive < N_DRIVE; drive++) {
		if (!(allowed_drive_mask & (1 << drive)))
			continue;
		if (fdc_state[FDC(drive)].version == FDC_NONE)
			continue;
4359 4360 4361 4362 4363 4364 4365 4366 4367

		floppy_device[drive].name = floppy_device_name;
		floppy_device[drive].id = drive;
		floppy_device[drive].dev.release = floppy_device_release;

		err = platform_device_register(&floppy_device[drive]);
		if (err)
			goto out_flush_work;

4368 4369
		err = device_create_file(&floppy_device[drive].dev,
					 &dev_attr_cmos);
4370 4371 4372
		if (err)
			goto out_unreg_platform_dev;

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4373 4374 4375 4376
		/* to be cleaned up... */
		disks[drive]->private_data = (void *)(long)drive;
		disks[drive]->queue = floppy_queue;
		disks[drive]->flags |= GENHD_FL_REMOVABLE;
4377
		disks[drive]->driverfs_dev = &floppy_device[drive].dev;
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4378 4379 4380 4381 4382
		add_disk(disks[drive]);
	}

	return 0;

4383 4384
out_unreg_platform_dev:
	platform_device_unregister(&floppy_device[drive]);
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4385 4386 4387 4388 4389 4390 4391
out_flush_work:
	flush_scheduled_work();
	if (usage_count)
		floppy_release_irq_and_dma();
out_unreg_region:
	blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
	blk_cleanup_queue(floppy_queue);
O
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4392 4393
out_unreg_driver:
	platform_driver_unregister(&floppy_driver);
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4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405
out_unreg_blkdev:
	unregister_blkdev(FLOPPY_MAJOR, "fd");
out_put_disk:
	while (dr--) {
		del_timer(&motor_off_timer[dr]);
		put_disk(disks[dr]);
	}
	return err;
}

static DEFINE_SPINLOCK(floppy_usage_lock);

4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432
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(FDCS->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++) {
4433 4434 4435 4436
		if (!request_region(FDCS->address + p->offset,
				    p->size, "floppy")) {
			DPRINT("Floppy io-port 0x%04lx in use\n",
			       FDCS->address + p->offset);
4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448
			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));
}

L
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4449 4450 4451 4452 4453 4454 4455 4456 4457 4458
static int floppy_grab_irq_and_dma(void)
{
	unsigned long flags;

	spin_lock_irqsave(&floppy_usage_lock, flags);
	if (usage_count++) {
		spin_unlock_irqrestore(&floppy_usage_lock, flags);
		return 0;
	}
	spin_unlock_irqrestore(&floppy_usage_lock, flags);
4459 4460 4461 4462 4463 4464 4465

	/*
	 * We might have scheduled a free_irq(), wait it to
	 * drain first:
	 */
	flush_scheduled_work();

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4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476
	if (fd_request_irq()) {
		DPRINT("Unable to grab IRQ%d for the floppy driver\n",
		       FLOPPY_IRQ);
		spin_lock_irqsave(&floppy_usage_lock, flags);
		usage_count--;
		spin_unlock_irqrestore(&floppy_usage_lock, flags);
		return -1;
	}
	if (fd_request_dma()) {
		DPRINT("Unable to grab DMA%d for the floppy driver\n",
		       FLOPPY_DMA);
4477 4478 4479 4480 4481 4482 4483 4484 4485
		if (can_use_virtual_dma & 2)
			use_virtual_dma = can_use_virtual_dma = 1;
		if (!(can_use_virtual_dma & 1)) {
			fd_free_irq();
			spin_lock_irqsave(&floppy_usage_lock, flags);
			usage_count--;
			spin_unlock_irqrestore(&floppy_usage_lock, flags);
			return -1;
		}
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	}

	for (fdc = 0; fdc < N_FDC; fdc++) {
		if (FDCS->address != -1) {
4490 4491
			if (floppy_request_regions(fdc))
				goto cleanup;
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		}
	}
	for (fdc = 0; fdc < N_FDC; fdc++) {
		if (FDCS->address != -1) {
			reset_fdc_info(1);
			fd_outb(FDCS->dor, FD_DOR);
		}
	}
	fdc = 0;
	set_dor(0, ~0, 8);	/* avoid immediate interrupt */

	for (fdc = 0; fdc < N_FDC; fdc++)
		if (FDCS->address != -1)
			fd_outb(FDCS->dor, FD_DOR);
	/*
4507 4508
	 * The driver will try and free resources and relies on us
	 * to know if they were allocated or not.
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	 */
	fdc = 0;
	irqdma_allocated = 1;
	return 0;
4513
cleanup:
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	fd_free_irq();
	fd_free_dma();
4516 4517
	while (--fdc >= 0)
		floppy_release_regions(fdc);
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	spin_lock_irqsave(&floppy_usage_lock, flags);
	usage_count--;
	spin_unlock_irqrestore(&floppy_usage_lock, flags);
	return -1;
}

static void floppy_release_irq_and_dma(void)
{
	int old_fdc;
#ifdef FLOPPY_SANITY_CHECK
#ifndef __sparc__
	int drive;
#endif
#endif
	long tmpsize;
	unsigned long tmpaddr;
	unsigned long flags;

	spin_lock_irqsave(&floppy_usage_lock, flags);
	if (--usage_count) {
		spin_unlock_irqrestore(&floppy_usage_lock, flags);
		return;
	}
	spin_unlock_irqrestore(&floppy_usage_lock, flags);
	if (irqdma_allocated) {
		fd_disable_dma();
		fd_free_dma();
4545
		fd_free_irq();
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		irqdma_allocated = 0;
	}
	set_dor(0, ~0, 8);
#if N_FDC > 1
	set_dor(1, ~8, 0);
#endif
	floppy_enable_hlt();

	if (floppy_track_buffer && max_buffer_sectors) {
		tmpsize = max_buffer_sectors * 1024;
		tmpaddr = (unsigned long)floppy_track_buffer;
		floppy_track_buffer = NULL;
		max_buffer_sectors = 0;
		buffer_min = buffer_max = -1;
		fd_dma_mem_free(tmpaddr, tmpsize);
	}
#ifdef FLOPPY_SANITY_CHECK
#ifndef __sparc__
	for (drive = 0; drive < N_FDC * 4; drive++)
		if (timer_pending(motor_off_timer + drive))
4566
			pr_info("motor off timer %d still active\n", drive);
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#endif

	if (timer_pending(&fd_timeout))
4570
		pr_info("floppy timer still active:%s\n", timeout_message);
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	if (timer_pending(&fd_timer))
4572
		pr_info("auxiliary floppy timer still active\n");
4573
	if (work_pending(&floppy_work))
4574
		pr_info("work still pending\n");
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#endif
	old_fdc = fdc;
	for (fdc = 0; fdc < N_FDC; fdc++)
4578 4579
		if (FDCS->address != -1)
			floppy_release_regions(fdc);
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	fdc = old_fdc;
}

#ifdef MODULE

static char *floppy;

static void __init parse_floppy_cfg_string(char *cfg)
{
	char *ptr;

	while (*cfg) {
4592 4593 4594
		ptr = cfg;
		while (*cfg && *cfg != ' ' && *cfg != '\t')
			cfg++;
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		if (*cfg) {
			*cfg = '\0';
			cfg++;
		}
		if (*ptr)
			floppy_setup(ptr);
	}
}

4604
static int __init floppy_module_init(void)
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{
	if (floppy)
		parse_floppy_cfg_string(floppy);
	return floppy_init();
}
4610
module_init(floppy_module_init);
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4611

4612
static void __exit floppy_module_exit(void)
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{
	int drive;

	blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
	unregister_blkdev(FLOPPY_MAJOR, "fd");
O
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	platform_driver_unregister(&floppy_driver);
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4619 4620 4621 4622 4623 4624 4625

	for (drive = 0; drive < N_DRIVE; drive++) {
		del_timer_sync(&motor_off_timer[drive]);

		if ((allowed_drive_mask & (1 << drive)) &&
		    fdc_state[FDC(drive)].version != FDC_NONE) {
			del_gendisk(disks[drive]);
4626 4627
			device_remove_file(&floppy_device[drive].dev, &dev_attr_cmos);
			platform_device_unregister(&floppy_device[drive]);
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		}
		put_disk(disks[drive]);
	}

	del_timer_sync(&fd_timeout);
	del_timer_sync(&fd_timer);
	blk_cleanup_queue(floppy_queue);

	if (usage_count)
		floppy_release_irq_and_dma();

	/* eject disk, if any */
	fd_eject(0);
}
4642

4643
module_exit(floppy_module_exit);
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module_param(floppy, charp, 0);
module_param(FLOPPY_IRQ, int, 0);
module_param(FLOPPY_DMA, int, 0);
MODULE_AUTHOR("Alain L. Knaff");
MODULE_SUPPORTED_DEVICE("fd");
MODULE_LICENSE("GPL");

4652 4653
/* This doesn't actually get used other than for module information */
static const struct pnp_device_id floppy_pnpids[] = {
4654 4655
	{"PNP0700", 0},
	{}
4656
};
4657

4658 4659
MODULE_DEVICE_TABLE(pnp, floppy_pnpids);

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#else

__setup("floppy=", floppy_setup);
module_init(floppy_init)
#endif

MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);