floppy.c 116.9 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.
 */

#undef  FLOPPY_SILENT_DCL_CLEAR

#define REALLY_SLOW_IO

#define DEBUGT 2

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#define DPRINT(format, args...) \
	pr_info("floppy%d: " format, current_drive, ##args)

#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 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];
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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 atomic_t usage_count = ATOMIC_INIT(0);
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/* 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;
}

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

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static void is_alive(const char *func, const char *message)
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{
	/* 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("%s: timeout handler died.  %s\n", func, message);
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	}
}

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

#define current_reqD -1
#define MAXTIMEOUT -2

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static void __reschedule_timeout(int drive, const char *message)
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{
	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\n", message);
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	timeout_message = message;
}

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

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

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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)
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				DPRINT("Disk type is undefined after disk change\n");
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			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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{
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	if (atomic_read(&usage_count) == 0) {
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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;

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	__reschedule_timeout(drive, "lock fdc");
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	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 */
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static void unlock_fdc(void)
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{
	unsigned long flags;

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

	if (do_floppy)
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		DPRINT("device interrupt still active at FDC release: %pf!\n",
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		       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;

	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) {
1100
		pr_info("non aligned address: %p\n", raw_cmd->kernel_data);
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		cont->done(0);
		FDCS->reset = 1;
		return;
	}
	f = claim_dma_lock();
	fd_disable_dma();
#ifdef fd_dma_setup
	if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
			 (raw_cmd->flags & FD_RAW_READ) ?
			 DMA_MODE_READ : DMA_MODE_WRITE, 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;
1161 1162

	if (is_ready_state(status)) {
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		fd_outb(byte, FD_DATA);
		output_log[output_log_pos].data = byte;
		output_log[output_log_pos].status = status;
		output_log[output_log_pos].jiffies = jiffies;
		output_log_pos = (output_log_pos + 1) % OLOGSIZE;
		return 0;
	}
	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) {
			resultjiffies = jiffies;
			resultsize = i;
			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();
1214

1215
	if (status < 0)
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		return -1;
1217 1218

	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.
 */
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static void perpendicular_mode(void)
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{
	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)
{
1303 1304 1305 1306 1307
	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);
1347
	if (slow_floppy)
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		srt = srt / 4;
1349

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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) {
1448
		DPRINT("-- FDC reply error\n");
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		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) {
1471
			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.
		 */
1514
		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]);

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	debugt(__func__, "rw_command");
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	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)
{
1559
	debugt(__func__, "");
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	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) {
1568 1569 1570
		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)
{
1581 1582
	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;
		}
1589 1590
		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 %s\n", __func__);
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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;
1623
	} 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;
	}
1656
	debugt(__func__, "");
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}

static void recal_interrupt(void)
{
1661
	debugt(__func__, "");
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	if (inr != 2)
		FDCS->reset = 1;
	else if (ST0 & ST0_ECE) {
		switch (DRS->track) {
		case NEED_1_RECAL:
1667
			debugt(__func__, "need 1 recal");
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			/* 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:
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			debugt(__func__, "need 2 recal");
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			/* 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 */
1683 1684
			debug_dcl(DP->flags,
				  "clearing NEWCHANGE flag because of second recalibrate\n");
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1686
			clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
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			DRS->select_date = jiffies;
			/* fall through */
		default:
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			debugt(__func__, "default");
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			/* 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++)
1712 1713
			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 */
1717
irqreturn_t floppy_interrupt(int irq, void *dev_id)
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{
	int do_print;
	unsigned long f;
1721
	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 */
1734 1735
		pr_info("DOR0=%x\n", fdc_state[0].dor);
		pr_info("floppy interrupt on bizarre fdc %d\n", fdc);
1736
		pr_info("handler=%pf\n", handler);
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		is_alive(__func__, "bizarre fdc");
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		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--;
1764 1765
		} 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);
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	is_alive(__func__, "normal interrupt end");
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	/* FIXME! Was it really for us? */
	return IRQ_HANDLED;
}

static void recalibrate_floppy(void)
{
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	debugt(__func__, "");
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	do_floppy = recal_interrupt;
	output_byte(FD_RECALIBRATE);
1783
	if (output_byte(UNIT(current_drive)) < 0)
1784
		reset_fdc();
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}

/*
 * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
 */
static void reset_interrupt(void)
{
1792
	debugt(__func__, "");
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	result();		/* get the status ready for set_fdc */
	if (FDCS->reset) {
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		pr_info("reset set in interrupt, calling %pf\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;

1833 1834 1835
	pr_info("\n");
	pr_info("floppy driver state\n");
	pr_info("-------------------\n");
1836
	pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%pf\n",
1837 1838
		jiffies, interruptjiffies, jiffies - interruptjiffies,
		lasthandler);
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1840 1841
	pr_info("timeout_message=%s\n", timeout_message);
	pr_info("last output bytes:\n");
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	for (i = 0; i < OLOGSIZE; i++)
1843 1844 1845 1846 1847 1848 1849 1850
		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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1852 1853
	pr_info("status=%x\n", fd_inb(FD_STATUS));
	pr_info("fdc_busy=%lu\n", fdc_busy);
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	if (do_floppy)
1855
		pr_info("do_floppy=%pf\n", do_floppy);
1856
	if (work_pending(&floppy_work))
1857
		pr_info("floppy_work.func=%pf\n", floppy_work.func);
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	if (timer_pending(&fd_timer))
1859
		pr_info("fd_timer.function=%pf\n", fd_timer.function);
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	if (timer_pending(&fd_timeout)) {
1861
		pr_info("timer_function=%pf\n", fd_timeout.function);
1862 1863 1864 1865 1866 1867 1868
		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;

1875
	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 */

1887
	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 {
1894
		pr_info("no cont in shutdown!\n");
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		process_fd_request();
	}
1897
	is_alive(__func__, "");
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}

/* start motor, check media-changed condition and write protection */
1901
static int start_motor(void (*function)(void))
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{
1903 1904
	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. */
1925 1926
	return fd_wait_for_completion(DRS->select_date + DP->select_delay,
				      (timeout_fn)function);
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}

static void floppy_ready(void)
{
1931 1932 1933 1934
	if (FDCS->reset) {
		reset_fdc();
		return;
	}
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	if (start_motor(floppy_ready))
		return;
	if (fdc_dtr())
		return;

1940
	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)
1943 1944
		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)
{
1968
	reschedule_timeout(current_reqD, "floppy start");
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	scandrives();
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	debug_dcl(DP->flags, "setting NEWCHANGE in floppy_start\n");
1972
	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)
{
1992
	reschedule_timeout(MAXTIMEOUT, "do wakeup");
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	cont = NULL;
	command_status += 2;
	wake_up(&command_done);
}

static struct cont_t wakeup_cont = {
	.interrupt	= empty,
	.redo		= do_wakeup,
	.error		= empty,
2002
	.done		= (done_f)empty
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};

static struct cont_t intr_cont = {
	.interrupt	= empty,
	.redo		= process_fd_request,
	.error		= empty,
2009
	.done		= (done_f)empty
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};

2012
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;

2030
			is_alive(__func__, "");
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			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();
}

2146
#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)
{
2151 2152 2153 2154 2155
	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;

2163 2164
	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;
			}
		}
	}
2212
	if (_floppy->stretch & FD_SECTBASEMASK) {
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		for (count = 0; count < F_SECT_PER_TRACK; count++)
2214
			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();
2223
	debugt(__func__, "queue format request");
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}

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;

2237
	if (lock_fdc(drive, true))
2238 2239
		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;
2254
	ret = wait_til_done(redo_format, true);
2255 2256
	if (ret == -EINTR)
		return -EINTR;
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	process_fd_request();
	return ret;
}

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

2266
static void floppy_end_request(struct request *req, int error)
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{
	unsigned int nr_sectors = current_count_sectors;
2269
	unsigned int drive = (unsigned long)req->rq_disk->private_data;
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	/* current_count_sectors can be zero if transfer failed */
2272
	if (error)
2273
		nr_sectors = blk_rq_cur_sectors(req);
2274
	if (__blk_end_request(req, error, nr_sectors << 9))
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		return;

	/* We're done with the request */
2278
	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;
2290
	char msg[sizeof("request done ") + sizeof(int) * 3];
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	probing = 0;
2293 2294
	snprintf(msg, sizeof(msg), "request done %d", uptodate);
	reschedule_timeout(MAXTIMEOUT, msg);
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	if (!req) {
2297
		pr_info("floppy.c: no request in request_done\n");
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		return;
	}

	if (uptodate) {
		/* maintain values for invalidation on geometry
		 * change */
2304
		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);
2311
		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) {
2318
				DRWE->first_error_sector = blk_rq_pos(req);
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				DRWE->first_error_generation = DRS->generation;
			}
2321
			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);
2325
		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)
{
2333 2334 2335 2336
	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;
2349
	ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
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	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;

	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);
2369 2370 2371 2372 2373 2374 2375
		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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	}

	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;
2428 2429
	int size;
	struct req_iterator iter;
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	char *base;

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

2435 2436 2437
	rq_for_each_segment(bv, current_req, iter) {
		if (page_address(bv->bv_page) + bv->bv_offset != base + size)
			break;
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2439
		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;
2466 2467
	char *buffer;
	char *dma_buffer;
2468 2469
	int size;
	struct req_iterator iter;
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	max_sector = transfer_size(ssize,
				   min(max_sector, max_sector_2),
2473
				   blk_rq_sectors(current_req));
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	if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2476
	    buffer_max > fsector_t + blk_rq_sectors(current_req))
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		current_count_sectors = min_t(int, buffer_max - fsector_t,
2478
					      blk_rq_sectors(current_req));
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	remaining = current_count_sectors << 9;
2481
	if (remaining > blk_rq_bytes(current_req) && CT(COMMAND) == FD_WRITE) {
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		DPRINT("in copy buffer\n");
2483 2484 2485 2486 2487 2488 2489 2490
		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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	}

	buffer_max = max(max_sector, buffer_max);

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

2497
	size = blk_rq_cur_bytes(current_req);
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2499 2500 2501
	rq_for_each_segment(bv, current_req, iter) {
		if (!remaining)
			break;
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2503 2504
		size = bv->bv_len;
		SUPBOUND(size, remaining);
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2506 2507 2508 2509 2510
		buffer = page_address(bv->bv_page) + bv->bv_offset;
		if (dma_buffer + size >
		    floppy_track_buffer + (max_buffer_sectors << 10) ||
		    dma_buffer < floppy_track_buffer) {
			DPRINT("buffer overrun in copy buffer %d\n",
2511 2512 2513 2514 2515
			       (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)
2517
				pr_info("read\n");
2518
			if (CT(COMMAND) == FD_WRITE)
2519
				pr_info("write\n");
2520
			break;
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		}
2522 2523
		if (((unsigned long)buffer) % 512)
			DPRINT("%p buffer not aligned\n", buffer);
2524

2525 2526 2527 2528 2529 2530 2531
		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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	}
	if (remaining) {
		if (remaining > 0)
			max_sector -= remaining >> 9;
		DPRINT("weirdness: remaining %d\n", remaining >> 9);
	}
}

/* work around a bug in pseudo DMA
 * (on some FDCs) pseudo DMA does not stop when the CPU stops
 * sending data.  Hence we need a different way to signal the
 * transfer length:  We use 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)
{
2549 2550
	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;
		if (end_sector > SECT_PER_TRACK) {
2558 2559
			pr_info("too many sectors %d > %d\n",
				end_sector, SECT_PER_TRACK);
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			return;
		}
2562 2563 2564
		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;
2581 2582 2583 2584
	int max_sector;
	int max_size;
	int tracksize;
	int ssize;
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	if (max_buffer_sectors == 0) {
2587
		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 {
2604
		DPRINT("%s: unknown command\n", __func__);
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		return 0;
	}

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

2610 2611
	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) {
2613
		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;

2621
	if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
2622 2623
	     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,
2632
				  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;
2649
	ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
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	SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
	SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
2652
	    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;
2683
	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;
		}
2692
	} else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
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		if (CT(COMMAND) == FD_WRITE) {
2694 2695 2696 2697
			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();
2718 2719
		dma_limit = (MAX_DMA_ADDRESS -
			     ((unsigned long)current_req->buffer)) >> 9;
2720
		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 &&
2737 2738 2739
		     *errors < DP->max_errors.read_track &&
		     ((!probing ||
		       (DP->read_track & (1 << DRS->probed_format)))))) {
2740
			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) {
2745
				DPRINT("%s: zero dma transfer attempted\n", __func__);
2746
				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 ||
2764
	      (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
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	     max_sector > 2 * max_buffer_sectors + buffer_min &&
2766 2767
	     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 +
2773
		((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) */
		if (in_sector_offset && buffer_track == -1)
			DPRINT("internal error offset !=0 on write\n");
		buffer_track = raw_cmd->track;
		buffer_drive = current_drive;
		copy_buffer(ssize, max_sector,
			    2 * max_buffer_sectors + buffer_min);
	} else
		transfer_size(ssize, max_sector,
			      2 * max_buffer_sectors + buffer_min -
			      aligned_sector_t);

	/* round up current_count_sectors to get dma xfer size */
	raw_cmd->length = in_sector_offset + current_count_sectors;
	raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
	raw_cmd->length <<= 9;
	if ((raw_cmd->length < current_count_sectors << 9) ||
	    (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)
2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817
			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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2818 2819 2820 2821 2822 2823 2824 2825 2826 2827
		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");
2828 2829 2830 2831
			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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2832
			if (CT(COMMAND) == FD_READ)
2833
				pr_info("read\n");
L
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2834
			if (CT(COMMAND) == FD_WRITE)
2835
				pr_info("write\n");
L
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2836 2837
			return 0;
		}
2838
	} else if (raw_cmd->length > blk_rq_bytes(current_req) ||
2839
		   current_count_sectors > blk_rq_sectors(current_req)) {
L
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2840 2841 2842 2843
		DPRINT("buffer overrun in direct transfer\n");
		return 0;
	} else if (raw_cmd->length < current_count_sectors << 9) {
		DPRINT("more sectors than bytes\n");
2844 2845
		pr_info("bytes=%ld\n", raw_cmd->length >> 9);
		pr_info("sectors=%ld\n", current_count_sectors);
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2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864
	}
	if (raw_cmd->length == 0) {
		DPRINT("zero dma transfer attempted from make_raw_request\n");
		return 0;
	}

	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);

2865 2866 2867 2868 2869 2870 2871 2872 2873 2874
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();
L
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2875 2876
			return;
		}
2877 2878 2879 2880
		current_req = req;
	}
	drive = (long)current_req->rq_disk->private_data;
	set_fdc(drive);
2881
	reschedule_timeout(current_reqD, "redo fd request");
L
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2882

2883 2884 2885 2886
	set_floppy(drive);
	raw_cmd = &default_raw_cmd;
	raw_cmd->flags = 0;
	if (start_motor(redo_fd_request))
L
Linus Torvalds 已提交
2887
		return;
2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914

	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;
L
Linus Torvalds 已提交
2915
	}
2916 2917 2918 2919

	if (test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags))
		twaddle();
	schedule_bh(floppy_start);
2920
	debugt(__func__, "queue fd request");
2921
	return;
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2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936
}

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);
}

2937
static void do_fd_request(struct request_queue *q)
L
Linus Torvalds 已提交
2938 2939
{
	if (max_buffer_sectors == 0) {
2940
		pr_info("VFS: %s called on non-open device\n", __func__);
L
Linus Torvalds 已提交
2941 2942 2943
		return;
	}

2944
	if (atomic_read(&usage_count) == 0) {
2945 2946 2947 2948 2949
		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);
L
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2950 2951 2952 2953 2954
		return;
	}
	if (test_bit(0, &fdc_busy)) {
		/* fdc busy, this new request will be treated when the
		   current one is done */
2955
		is_alive(__func__, "old request running");
L
Linus Torvalds 已提交
2956 2957
		return;
	}
2958
	lock_fdc(MAXTIMEOUT, false);
L
Linus Torvalds 已提交
2959
	process_fd_request();
2960
	is_alive(__func__, "");
L
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2961 2962 2963 2964 2965 2966 2967 2968 2969
}

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

2970
static int poll_drive(bool interruptible, int flag)
L
Linus Torvalds 已提交
2971 2972 2973 2974 2975 2976 2977
{
	/* 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;
2978
	debug_dcl(DP->flags, "setting NEWCHANGE in poll_drive\n");
2979
	set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
2980 2981

	return wait_til_done(floppy_ready, interruptible);
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2982 2983 2984 2985 2986 2987 2988 2989 2990
}

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

static void reset_intr(void)
{
2991
	pr_info("weird, reset interrupt called\n");
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Linus Torvalds 已提交
2992 2993 2994 2995 2996 2997 2998 2999 3000
}

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

3001
static int user_reset_fdc(int drive, int arg, bool interruptible)
L
Linus Torvalds 已提交
3002 3003 3004
{
	int ret;

3005 3006 3007
	if (lock_fdc(drive, interruptible))
		return -EINTR;

L
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3008 3009 3010 3011
	if (arg == FD_RESET_ALWAYS)
		FDCS->reset = 1;
	if (FDCS->reset) {
		cont = &reset_cont;
3012 3013 3014
		ret = wait_til_done(reset_fdc, interruptible);
		if (ret == -EINTR)
			return -EINTR;
L
Linus Torvalds 已提交
3015 3016
	}
	process_fd_request();
3017
	return 0;
L
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3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029
}

/*
 * 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;
}

3030 3031
static inline int fd_copyin(void __user *param, void *address,
			    unsigned long size)
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Linus Torvalds 已提交
3032 3033 3034 3035
{
	return copy_from_user(address, param, size) ? -EFAULT : 0;
}

3036
static const char *drive_name(int type, int drive)
L
Linus Torvalds 已提交
3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 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
{
	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
};

3106
static int raw_cmd_copyout(int cmd, void __user *param,
L
Linus Torvalds 已提交
3107 3108 3109 3110 3111
				  struct floppy_raw_cmd *ptr)
{
	int ret;

	while (ptr) {
3112
		ret = copy_to_user(param, ptr, sizeof(*ptr));
3113 3114
		if (ret)
			return -EFAULT;
L
Linus Torvalds 已提交
3115 3116
		param += sizeof(struct floppy_raw_cmd);
		if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3117 3118 3119
			if (ptr->length >= 0 &&
			    ptr->length <= ptr->buffer_length) {
				long length = ptr->buffer_length - ptr->length;
3120 3121 3122 3123
				ret = fd_copyout(ptr->data, ptr->kernel_data,
						 length);
				if (ret)
					return ret;
3124
			}
L
Linus Torvalds 已提交
3125 3126 3127
		}
		ptr = ptr->next;
	}
3128

L
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3129 3130 3131 3132 3133
	return 0;
}

static void raw_cmd_free(struct floppy_raw_cmd **ptr)
{
3134 3135
	struct floppy_raw_cmd *next;
	struct floppy_raw_cmd *this;
L
Linus Torvalds 已提交
3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150

	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;
	}
}

3151
static int raw_cmd_copyin(int cmd, void __user *param,
L
Linus Torvalds 已提交
3152 3153 3154 3155 3156 3157 3158
				 struct floppy_raw_cmd **rcmd)
{
	struct floppy_raw_cmd *ptr;
	int ret;
	int i;

	*rcmd = NULL;
3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171

loop:
	ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
	if (!ptr)
		return -ENOMEM;
	*rcmd = ptr;
	ret = copy_from_user(ptr, param, sizeof(*ptr));
	if (ret)
		return -EFAULT;
	ptr->next = NULL;
	ptr->buffer_length = 0;
	param += sizeof(struct floppy_raw_cmd);
	if (ptr->cmd_count > 33)
L
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3172 3173 3174 3175 3176 3177 3178 3179
			/* 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...
			 */
3180 3181 3182 3183 3184 3185 3186 3187 3188
		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)
L
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3189
			return -EINVAL;
3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200
		ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length);
		fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
		if (!ptr->kernel_data)
			return -ENOMEM;
		ptr->buffer_length = ptr->length;
	}
	if (ptr->flags & FD_RAW_WRITE) {
		ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length);
		if (ret)
			return ret;
	}
L
Linus Torvalds 已提交
3201

3202
	if (ptr->flags & FD_RAW_MORE) {
L
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3203 3204
		rcmd = &(ptr->next);
		ptr->rate &= 0x43;
3205
		goto loop;
L
Linus Torvalds 已提交
3206
	}
3207 3208

	return 0;
L
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3209 3210 3211 3212 3213
}

static int raw_cmd_ioctl(int cmd, void __user *param)
{
	struct floppy_raw_cmd *my_raw_cmd;
3214 3215 3216
	int drive;
	int ret2;
	int ret;
L
Linus Torvalds 已提交
3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244

	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;
3245
	ret = wait_til_done(floppy_start, true);
3246
	debug_dcl(DP->flags, "calling disk change from raw_cmd ioctl\n");
L
Linus Torvalds 已提交
3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268

	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;
}

3269
static int set_geometry(unsigned int cmd, struct floppy_struct *g,
L
Linus Torvalds 已提交
3270 3271 3272 3273 3274 3275 3276 3277 3278
			       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 */
3279
	    (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
L
Linus Torvalds 已提交
3280 3281 3282 3283
		return -EINVAL;
	if (type) {
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;
3284
		mutex_lock(&open_lock);
3285
		if (lock_fdc(drive, true)) {
J
Jiri Slaby 已提交
3286 3287 3288
			mutex_unlock(&open_lock);
			return -EINTR;
		}
L
Linus Torvalds 已提交
3289 3290 3291 3292 3293 3294 3295 3296 3297 3298
		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;
3299
			__invalidate_device(bdev);
L
Linus Torvalds 已提交
3300
		}
3301
		mutex_unlock(&open_lock);
L
Linus Torvalds 已提交
3302 3303
	} else {
		int oldStretch;
3304

3305
		if (lock_fdc(drive, true))
3306
			return -EINTR;
3307
		if (cmd != FDDEFPRM) {
L
Linus Torvalds 已提交
3308 3309
			/* notice a disk change immediately, else
			 * we lose our settings immediately*/
3310
			if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3311 3312
				return -EINTR;
		}
L
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3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330
		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) &
3331
		     (FD_SWAPSIDES | FD_SECTBASEMASK)))
L
Linus Torvalds 已提交
3332 3333 3334 3335 3336 3337 3338 3339
			invalidate_drive(bdev);
		else
			process_fd_request();
	}
	return 0;
}

/* handle obsolete ioctl's */
3340
static unsigned int ioctl_table[] = {
L
Linus Torvalds 已提交
3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367
	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
};

3368
static int normalize_ioctl(unsigned int *cmd, int *size)
L
Linus Torvalds 已提交
3369 3370 3371 3372 3373 3374 3375 3376
{
	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)) {
3377
				pr_info("ioctl not yet supported\n");
L
Linus Torvalds 已提交
3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390
				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 {
3391
		if (lock_fdc(drive, false))
3392
			return -EINTR;
3393
		if (poll_drive(false, 0) == -EINTR)
3394
			return -EINTR;
L
Linus Torvalds 已提交
3395 3396 3397 3398 3399 3400 3401 3402
		process_fd_request();
		*g = current_type[drive];
	}
	if (!*g)
		return -ENODEV;
	return 0;
}

3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419
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
3420
static int fd_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
L
Linus Torvalds 已提交
3421 3422
		    unsigned long param)
{
A
Al Viro 已提交
3423
	int drive = (long)bdev->bd_disk->private_data;
3424 3425
	int type = ITYPE(UDRS->fd_device);
	int i;
L
Linus Torvalds 已提交
3426 3427 3428 3429 3430 3431 3432 3433
	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 */
3434
	const void *outparam;	/* parameters passed back to user space */
L
Linus Torvalds 已提交
3435 3436 3437 3438 3439

	/* 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 */
3440
	    cmd == 0x6470) {		/* SunOS floppy eject */
L
Linus Torvalds 已提交
3441 3442 3443 3444 3445
		DPRINT("obsolete eject ioctl\n");
		DPRINT("please use floppycontrol --eject\n");
		cmd = FDEJECT;
	}

3446
	if (!((cmd & 0xff00) == 0x0200))
L
Linus Torvalds 已提交
3447 3448
		return -EINVAL;

3449
	/* convert the old style command into a new style command */
3450 3451 3452
	ret = normalize_ioctl(&cmd, &size);
	if (ret)
		return ret;
3453

L
Linus Torvalds 已提交
3454
	/* permission checks */
3455
	if (((cmd & 0x40) && !(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) ||
L
Linus Torvalds 已提交
3456 3457 3458
	    ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
		return -EPERM;

3459 3460 3461
	if (WARN_ON(size < 0 || size > sizeof(inparam)))
		return -EINVAL;

L
Linus Torvalds 已提交
3462
	/* copyin */
3463
	memset(&inparam, 0, sizeof(inparam));
3464 3465 3466 3467 3468
	if (_IOC_DIR(cmd) & _IOC_WRITE) {
		ret = fd_copyin((void __user *)param, &inparam, size);
		if (ret)
			return ret;
	}
L
Linus Torvalds 已提交
3469

3470 3471 3472 3473 3474
	switch (cmd) {
	case FDEJECT:
		if (UDRS->fd_ref != 1)
			/* somebody else has this drive open */
			return -EBUSY;
3475
		if (lock_fdc(drive, true))
3476
			return -EINTR;
L
Linus Torvalds 已提交
3477

3478 3479 3480
		/* do the actual eject. Fails on
		 * non-Sparc architectures */
		ret = fd_eject(UNIT(drive));
L
Linus Torvalds 已提交
3481

3482 3483
		set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
		set_bit(FD_VERIFY_BIT, &UDRS->flags);
3484 3485 3486
		process_fd_request();
		return ret;
	case FDCLRPRM:
3487
		if (lock_fdc(drive, true))
3488
			return -EINTR;
3489 3490 3491 3492 3493 3494 3495 3496
		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:
3497
		ret = get_floppy_geometry(drive, type,
3498
					  (struct floppy_struct **)&outparam);
3499 3500
		if (ret)
			return ret;
3501 3502 3503 3504 3505 3506 3507 3508
		break;
	case FDMSGON:
		UDP->flags |= FTD_MSG;
		return 0;
	case FDMSGOFF:
		UDP->flags &= ~FTD_MSG;
		return 0;
	case FDFMTBEG:
3509
		if (lock_fdc(drive, true))
3510
			return -EINTR;
3511
		if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3512
			return -EINTR;
3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525
		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:
3526
		if (lock_fdc(drive, true))
3527
			return -EINTR;
3528 3529 3530 3531 3532
		return invalidate_drive(bdev);
	case FDSETEMSGTRESH:
		UDP->max_errors.reporting = (unsigned short)(param & 0x0f);
		return 0;
	case FDGETMAXERRS:
3533
		outparam = &UDP->max_errors;
3534 3535 3536 3537 3538 3539
		break;
	case FDSETMAXERRS:
		UDP->max_errors = inparam.max_errors;
		break;
	case FDGETDRVTYP:
		outparam = drive_name(type, drive);
3540
		SUPBOUND(size, strlen((const char *)outparam) + 1);
3541 3542 3543 3544 3545
		break;
	case FDSETDRVPRM:
		*UDP = inparam.dp;
		break;
	case FDGETDRVPRM:
3546
		outparam = UDP;
3547 3548
		break;
	case FDPOLLDRVSTAT:
3549
		if (lock_fdc(drive, true))
3550
			return -EINTR;
3551
		if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3552
			return -EINTR;
3553 3554 3555
		process_fd_request();
		/* fall through */
	case FDGETDRVSTAT:
3556
		outparam = UDRS;
3557 3558
		break;
	case FDRESET:
3559
		return user_reset_fdc(drive, (int)param, true);
3560
	case FDGETFDCSTAT:
3561
		outparam = UFDCS;
3562 3563 3564 3565 3566
		break;
	case FDWERRORCLR:
		memset(UDRWE, 0, sizeof(*UDRWE));
		return 0;
	case FDWERRORGET:
3567
		outparam = UDRWE;
3568 3569 3570
		break;
	case FDRAWCMD:
		if (type)
L
Linus Torvalds 已提交
3571
			return -EINVAL;
3572
		if (lock_fdc(drive, true))
3573
			return -EINTR;
3574
		set_floppy(drive);
3575 3576 3577
		i = raw_cmd_ioctl(cmd, (void __user *)param);
		if (i == -EINTR)
			return -EINTR;
3578 3579 3580
		process_fd_request();
		return i;
	case FDTWADDLE:
3581
		if (lock_fdc(drive, true))
3582
			return -EINTR;
3583 3584 3585 3586 3587 3588
		twaddle();
		process_fd_request();
		return 0;
	default:
		return -EINVAL;
	}
L
Linus Torvalds 已提交
3589 3590 3591

	if (_IOC_DIR(cmd) & _IOC_READ)
		return fd_copyout((void __user *)param, outparam, size);
3592 3593

	return 0;
L
Linus Torvalds 已提交
3594 3595 3596 3597
}

static void __init config_types(void)
{
3598
	bool has_drive = false;
L
Linus Torvalds 已提交
3599 3600 3601 3602 3603 3604 3605 3606 3607 3608
	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;

3609
	/* FIXME: additional physical CMOS drive detection should go here */
L
Linus Torvalds 已提交
3610 3611 3612 3613 3614 3615 3616

	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];

3617
		if (type < ARRAY_SIZE(default_drive_params)) {
L
Linus Torvalds 已提交
3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629
			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) {
3630 3631 3632 3633 3634 3635 3636
			const char *prepend;
			if (!has_drive) {
				prepend = "";
				has_drive = true;
				pr_info("Floppy drive(s):");
			} else {
				prepend = ",";
L
Linus Torvalds 已提交
3637
			}
3638 3639

			pr_cont("%s fd%d is %s", prepend, drive, name);
L
Linus Torvalds 已提交
3640 3641 3642
		}
		*UDP = *params;
	}
3643 3644 3645

	if (has_drive)
		pr_cont("\n");
L
Linus Torvalds 已提交
3646 3647
}

A
Al Viro 已提交
3648
static int floppy_release(struct gendisk *disk, fmode_t mode)
L
Linus Torvalds 已提交
3649
{
A
Al Viro 已提交
3650
	int drive = (long)disk->private_data;
L
Linus Torvalds 已提交
3651

3652
	mutex_lock(&open_lock);
L
Linus Torvalds 已提交
3653 3654 3655 3656 3657 3658 3659 3660
	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;
3661
	mutex_unlock(&open_lock);
3662

L
Linus Torvalds 已提交
3663 3664 3665 3666 3667 3668 3669 3670
	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
3671
static int floppy_open(struct block_device *bdev, fmode_t mode)
L
Linus Torvalds 已提交
3672
{
A
Al Viro 已提交
3673 3674
	int drive = (long)bdev->bd_disk->private_data;
	int old_dev, new_dev;
L
Linus Torvalds 已提交
3675 3676 3677 3678
	int try;
	int res = -EBUSY;
	char *tmp;

3679
	mutex_lock(&open_lock);
L
Linus Torvalds 已提交
3680
	old_dev = UDRS->fd_device;
A
Al Viro 已提交
3681
	if (opened_bdev[drive] && opened_bdev[drive] != bdev)
L
Linus Torvalds 已提交
3682 3683 3684
		goto out2;

	if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) {
3685 3686
		set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
		set_bit(FD_VERIFY_BIT, &UDRS->flags);
L
Linus Torvalds 已提交
3687 3688
	}

A
Al Viro 已提交
3689
	if (UDRS->fd_ref == -1 || (UDRS->fd_ref && (mode & FMODE_EXCL)))
L
Linus Torvalds 已提交
3690 3691
		goto out2;

A
Al Viro 已提交
3692
	if (mode & FMODE_EXCL)
L
Linus Torvalds 已提交
3693 3694 3695 3696
		UDRS->fd_ref = -1;
	else
		UDRS->fd_ref++;

A
Al Viro 已提交
3697
	opened_bdev[drive] = bdev;
L
Linus Torvalds 已提交
3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714

	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);
		}
3715
		if (!tmp && !floppy_track_buffer)
L
Linus Torvalds 已提交
3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730
			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
3731 3732 3733 3734
	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
3735 3736 3737 3738 3739 3740 3741
		if (buffer_drive == drive)
			buffer_track = -1;
	}

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

A
Al Viro 已提交
3742 3743
	if (!(mode & FMODE_NDELAY)) {
		if (mode & (FMODE_READ|FMODE_WRITE)) {
L
Linus Torvalds 已提交
3744
			UDRS->last_checked = 0;
A
Al Viro 已提交
3745
			check_disk_change(bdev);
3746
			if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags))
L
Linus Torvalds 已提交
3747 3748 3749
				goto out;
		}
		res = -EROFS;
3750 3751
		if ((mode & FMODE_WRITE) &&
		    !test_bit(FD_DISK_WRITABLE_BIT, &UDRS->flags))
L
Linus Torvalds 已提交
3752 3753
			goto out;
	}
3754
	mutex_unlock(&open_lock);
L
Linus Torvalds 已提交
3755 3756 3757 3758 3759 3760 3761 3762 3763
	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:
3764
	mutex_unlock(&open_lock);
L
Linus Torvalds 已提交
3765 3766 3767 3768 3769 3770 3771 3772 3773 3774
	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;

3775 3776
	if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
	    test_bit(FD_VERIFY_BIT, &UDRS->flags))
L
Linus Torvalds 已提交
3777 3778
		return 1;

3779
	if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) {
3780 3781
		lock_fdc(drive, false);
		poll_drive(false, 0);
L
Linus Torvalds 已提交
3782 3783 3784
		process_fd_request();
	}

3785 3786
	if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
	    test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
L
Linus Torvalds 已提交
3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798
	    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.
 */

3799
static void floppy_rb0_complete(struct bio *bio, int err)
L
Linus Torvalds 已提交
3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831
{
	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;
3832
	bio.bi_flags = BIO_QUIET;
L
Linus Torvalds 已提交
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
	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;

3858 3859 3860
	if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
	    test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
	    test_bit(drive, &fake_change) || NO_GEOM) {
3861
		if (atomic_read(&usage_count) == 0) {
3862
			pr_info("VFS: revalidate called on non-open device.\n");
L
Linus Torvalds 已提交
3863 3864
			return -EFAULT;
		}
3865
		lock_fdc(drive, false);
3866 3867
		cf = (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
		      test_bit(FD_VERIFY_BIT, &UDRS->flags));
L
Linus Torvalds 已提交
3868 3869 3870 3871 3872 3873 3874 3875 3876
		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);
3877
		clear_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
L
Linus Torvalds 已提交
3878 3879 3880 3881 3882 3883 3884
		if (cf)
			UDRS->generation++;
		if (NO_GEOM) {
			/* auto-sensing */
			res = __floppy_read_block_0(opened_bdev[drive]);
		} else {
			if (cf)
3885
				poll_drive(false, FD_RAW_NEED_DISK);
L
Linus Torvalds 已提交
3886 3887 3888 3889 3890 3891 3892
			process_fd_request();
		}
	}
	set_capacity(disk, floppy_sizes[UDRS->fd_device]);
	return res;
}

3893
static const struct block_device_operations floppy_fops = {
3894
	.owner			= THIS_MODULE,
A
Al Viro 已提交
3895 3896 3897
	.open			= floppy_open,
	.release		= floppy_release,
	.locked_ioctl		= fd_ioctl,
3898 3899 3900
	.getgeo			= fd_getgeo,
	.media_changed		= check_floppy_change,
	.revalidate_disk	= floppy_revalidate,
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3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916
};

/*
 * 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;
3917 3918
	r = result();
	if (r <= 0x00)
L
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3919 3920
		return FDC_NONE;	/* No FDC present ??? */
	if ((r == 1) && (reply_buffer[0] == 0x80)) {
3921
		pr_info("FDC %d is an 8272A\n", fdc);
L
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3922 3923 3924
		return FDC_8272A;	/* 8272a/765 don't know DUMPREGS */
	}
	if (r != 10) {
3925 3926
		pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
			fdc, r);
L
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3927 3928 3929 3930
		return FDC_UNKNOWN;
	}

	if (!fdc_configure()) {
3931
		pr_info("FDC %d is an 82072\n", fdc);
L
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3932 3933 3934 3935 3936 3937 3938
		return FDC_82072;	/* 82072 doesn't know CONFIGURE */
	}

	output_byte(FD_PERPENDICULAR);
	if (need_more_output() == MORE_OUTPUT) {
		output_byte(0);
	} else {
3939
		pr_info("FDC %d is an 82072A\n", fdc);
L
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3940 3941 3942 3943 3944 3945
		return FDC_82072A;	/* 82072A as found on Sparcs. */
	}

	output_byte(FD_UNLOCK);
	r = result();
	if ((r == 1) && (reply_buffer[0] == 0x80)) {
3946
		pr_info("FDC %d is a pre-1991 82077\n", fdc);
3947
		return FDC_82077_ORIG;	/* Pre-1991 82077, doesn't know
L
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3948 3949 3950
					 * LOCK/UNLOCK */
	}
	if ((r != 1) || (reply_buffer[0] != 0x00)) {
3951 3952
		pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
			fdc, r);
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3953 3954 3955 3956 3957
		return FDC_UNKNOWN;
	}
	output_byte(FD_PARTID);
	r = result();
	if (r != 1) {
3958 3959
		pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n",
			fdc, r);
L
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3960 3961 3962
		return FDC_UNKNOWN;
	}
	if (reply_buffer[0] == 0x80) {
3963
		pr_info("FDC %d is a post-1991 82077\n", fdc);
L
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3964 3965 3966 3967 3968
		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 */
3969
		pr_info("FDC %d is an 82078.\n", fdc);
L
Linus Torvalds 已提交
3970 3971
		return FDC_82078;
	case 0x1:
3972
		pr_info("FDC %d is a 44pin 82078\n", fdc);
L
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3973 3974
		return FDC_82078;
	case 0x2:
3975
		pr_info("FDC %d is a S82078B\n", fdc);
L
Linus Torvalds 已提交
3976 3977
		return FDC_S82078B;
	case 0x3:
3978
		pr_info("FDC %d is a National Semiconductor PC87306\n", fdc);
L
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3979 3980
		return FDC_87306;
	default:
3981 3982
		pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
			fdc, reply_buffer[0] >> 5);
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Linus Torvalds 已提交
3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 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
		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)
4094 4095 4096
					config_params[i].fn(ints, param,
							    config_params[i].
							    param2);
L
Linus Torvalds 已提交
4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109
				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++)
4110 4111
			pr_cont(" %s", config_params[i].name);
		pr_cont("\n");
L
Linus Torvalds 已提交
4112 4113
	} else
		DPRINT("botched floppy option\n");
4114
	DPRINT("Read Documentation/blockdev/floppy.txt\n");
L
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4115 4116 4117 4118 4119
	return 0;
}

static int have_no_fdc = -ENODEV;

4120 4121
static ssize_t floppy_cmos_show(struct device *dev,
				struct device_attribute *attr, char *buf)
4122
{
4123
	struct platform_device *p = to_platform_device(dev);
4124
	int drive;
4125

4126 4127
	drive = p->id;
	return sprintf(buf, "%X\n", UDP->cmos);
4128
}
4129

4130
static DEVICE_ATTR(cmos, S_IRUGO, floppy_cmos_show, NULL);
4131

L
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4132 4133 4134 4135
static void floppy_device_release(struct device *dev)
{
}

F
Frans Pop 已提交
4136
static int floppy_resume(struct device *dev)
O
Ondrej Zary 已提交
4137 4138 4139 4140 4141
{
	int fdc;

	for (fdc = 0; fdc < N_FDC; fdc++)
		if (FDCS->address != -1)
4142
			user_reset_fdc(-1, FD_RESET_ALWAYS, false);
O
Ondrej Zary 已提交
4143 4144 4145 4146

	return 0;
}

4147
static const struct dev_pm_ops floppy_pm_ops = {
O
Ondrej Zary 已提交
4148
	.resume = floppy_resume,
F
Frans Pop 已提交
4149 4150 4151 4152
	.restore = floppy_resume,
};

static struct platform_driver floppy_driver = {
O
Ondrej Zary 已提交
4153
	.driver = {
4154 4155
		   .name = "floppy",
		   .pm = &floppy_pm_ops,
O
Ondrej Zary 已提交
4156 4157 4158
	},
};

4159
static struct platform_device floppy_device[N_DRIVE];
L
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4160 4161 4162 4163 4164 4165 4166 4167

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;
4168
	if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type))
L
Linus Torvalds 已提交
4169 4170 4171 4172 4173 4174 4175 4176 4177 4178
		return NULL;
	*part = 0;
	return get_disk(disks[drive]);
}

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

4179 4180 4181
	set_debugt();
	interruptjiffies = resultjiffies = jiffies;

4182
#if defined(CONFIG_PPC)
4183 4184 4185 4186
	if (check_legacy_ioport(FDC1))
		return -ENODEV;
#endif

L
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4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207
	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)
4208
		goto out_put_disk;
L
Linus Torvalds 已提交
4209

O
Ondrej Zary 已提交
4210 4211 4212 4213
	err = platform_driver_register(&floppy_driver);
	if (err)
		goto out_unreg_blkdev;

L
Linus Torvalds 已提交
4214 4215 4216
	floppy_queue = blk_init_queue(do_fd_request, &floppy_lock);
	if (!floppy_queue) {
		err = -ENOMEM;
O
Ondrej Zary 已提交
4217
		goto out_unreg_driver;
L
Linus Torvalds 已提交
4218
	}
4219
	blk_queue_max_hw_sectors(floppy_queue, 64);
L
Linus Torvalds 已提交
4220 4221 4222 4223 4224 4225 4226 4227 4228 4229

	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;

4230
	reschedule_timeout(MAXTIMEOUT, "floppy init");
L
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4231 4232 4233 4234
	config_types();

	for (i = 0; i < N_FDC; i++) {
		fdc = i;
4235
		memset(FDCS, 0, sizeof(*FDCS));
L
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4236 4237 4238
		FDCS->dtr = -1;
		FDCS->dor = 0x4;
#if defined(__sparc__) || defined(__mc68000__)
4239
	/*sparcs/sun3x don't have a DOR reset which we can fall back on to */
L
Linus Torvalds 已提交
4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267
#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++) {
4268 4269
		memset(UDRS, 0, sizeof(*UDRS));
		memset(UDRWE, 0, sizeof(*UDRWE));
4270 4271 4272
		set_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
		set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
		set_bit(FD_VERIFY_BIT, &UDRS->flags);
L
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4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291
		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;
4292
		if (user_reset_fdc(-1, FD_RESET_ALWAYS, false)) {
L
Linus Torvalds 已提交
4293
			/* free ioports reserved by floppy_grab_irq_and_dma() */
4294
			floppy_release_regions(fdc);
L
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4295 4296 4297 4298 4299 4300 4301 4302
			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() */
4303
			floppy_release_regions(fdc);
L
Linus Torvalds 已提交
4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314
			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.
		 */
4315
		user_reset_fdc(-1, FD_RESET_ALWAYS, false);
L
Linus Torvalds 已提交
4316 4317 4318 4319
	}
	fdc = 0;
	del_timer(&fd_timeout);
	current_drive = 0;
4320
	initialized = true;
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4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331
	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;
4332 4333 4334 4335 4336 4337 4338 4339 4340

		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;

4341 4342
		err = device_create_file(&floppy_device[drive].dev,
					 &dev_attr_cmos);
4343 4344 4345
		if (err)
			goto out_unreg_platform_dev;

L
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4346 4347 4348 4349
		/* to be cleaned up... */
		disks[drive]->private_data = (void *)(long)drive;
		disks[drive]->queue = floppy_queue;
		disks[drive]->flags |= GENHD_FL_REMOVABLE;
4350
		disks[drive]->driverfs_dev = &floppy_device[drive].dev;
L
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4351 4352 4353 4354 4355
		add_disk(disks[drive]);
	}

	return 0;

4356 4357
out_unreg_platform_dev:
	platform_device_unregister(&floppy_device[drive]);
L
Linus Torvalds 已提交
4358 4359
out_flush_work:
	flush_scheduled_work();
4360
	if (atomic_read(&usage_count))
L
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4361 4362 4363 4364
		floppy_release_irq_and_dma();
out_unreg_region:
	blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
	blk_cleanup_queue(floppy_queue);
O
Ondrej Zary 已提交
4365 4366
out_unreg_driver:
	platform_driver_unregister(&floppy_driver);
L
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4367 4368 4369 4370 4371 4372 4373 4374 4375 4376
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;
}

4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403
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++) {
4404 4405 4406 4407
		if (!request_region(FDCS->address + p->offset,
				    p->size, "floppy")) {
			DPRINT("Floppy io-port 0x%04lx in use\n",
			       FDCS->address + p->offset);
4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419
			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
Linus Torvalds 已提交
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static int floppy_grab_irq_and_dma(void)
{
4422
	if (atomic_inc_return(&usage_count) > 1)
L
Linus Torvalds 已提交
4423
		return 0;
4424 4425 4426 4427 4428 4429 4430

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

L
Linus Torvalds 已提交
4431 4432 4433
	if (fd_request_irq()) {
		DPRINT("Unable to grab IRQ%d for the floppy driver\n",
		       FLOPPY_IRQ);
4434
		atomic_dec(&usage_count);
L
Linus Torvalds 已提交
4435 4436 4437 4438 4439
		return -1;
	}
	if (fd_request_dma()) {
		DPRINT("Unable to grab DMA%d for the floppy driver\n",
		       FLOPPY_DMA);
4440 4441 4442 4443
		if (can_use_virtual_dma & 2)
			use_virtual_dma = can_use_virtual_dma = 1;
		if (!(can_use_virtual_dma & 1)) {
			fd_free_irq();
4444
			atomic_dec(&usage_count);
4445 4446
			return -1;
		}
L
Linus Torvalds 已提交
4447 4448 4449 4450
	}

	for (fdc = 0; fdc < N_FDC; fdc++) {
		if (FDCS->address != -1) {
4451 4452
			if (floppy_request_regions(fdc))
				goto cleanup;
L
Linus Torvalds 已提交
4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467
		}
	}
	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);
	/*
4468 4469
	 * The driver will try and free resources and relies on us
	 * to know if they were allocated or not.
L
Linus Torvalds 已提交
4470 4471 4472 4473
	 */
	fdc = 0;
	irqdma_allocated = 1;
	return 0;
4474
cleanup:
L
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4475 4476
	fd_free_irq();
	fd_free_dma();
4477 4478
	while (--fdc >= 0)
		floppy_release_regions(fdc);
4479
	atomic_dec(&usage_count);
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	return -1;
}

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

4492
	if (!atomic_dec_and_test(&usage_count))
L
Linus Torvalds 已提交
4493
		return;
4494

L
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4495 4496 4497
	if (irqdma_allocated) {
		fd_disable_dma();
		fd_free_dma();
4498
		fd_free_irq();
L
Linus Torvalds 已提交
4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517
		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);
	}
#ifndef __sparc__
	for (drive = 0; drive < N_FDC * 4; drive++)
		if (timer_pending(motor_off_timer + drive))
4518
			pr_info("motor off timer %d still active\n", drive);
L
Linus Torvalds 已提交
4519 4520 4521
#endif

	if (timer_pending(&fd_timeout))
4522
		pr_info("floppy timer still active:%s\n", timeout_message);
L
Linus Torvalds 已提交
4523
	if (timer_pending(&fd_timer))
4524
		pr_info("auxiliary floppy timer still active\n");
4525
	if (work_pending(&floppy_work))
4526
		pr_info("work still pending\n");
L
Linus Torvalds 已提交
4527 4528
	old_fdc = fdc;
	for (fdc = 0; fdc < N_FDC; fdc++)
4529 4530
		if (FDCS->address != -1)
			floppy_release_regions(fdc);
L
Linus Torvalds 已提交
4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542
	fdc = old_fdc;
}

#ifdef MODULE

static char *floppy;

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

	while (*cfg) {
4543 4544 4545
		ptr = cfg;
		while (*cfg && *cfg != ' ' && *cfg != '\t')
			cfg++;
L
Linus Torvalds 已提交
4546 4547 4548 4549 4550 4551 4552 4553 4554
		if (*cfg) {
			*cfg = '\0';
			cfg++;
		}
		if (*ptr)
			floppy_setup(ptr);
	}
}

4555
static int __init floppy_module_init(void)
L
Linus Torvalds 已提交
4556 4557 4558 4559 4560
{
	if (floppy)
		parse_floppy_cfg_string(floppy);
	return floppy_init();
}
4561
module_init(floppy_module_init);
L
Linus Torvalds 已提交
4562

4563
static void __exit floppy_module_exit(void)
L
Linus Torvalds 已提交
4564 4565 4566 4567 4568
{
	int drive;

	blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
	unregister_blkdev(FLOPPY_MAJOR, "fd");
O
Ondrej Zary 已提交
4569
	platform_driver_unregister(&floppy_driver);
L
Linus Torvalds 已提交
4570 4571 4572 4573 4574 4575 4576

	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]);
4577 4578
			device_remove_file(&floppy_device[drive].dev, &dev_attr_cmos);
			platform_device_unregister(&floppy_device[drive]);
L
Linus Torvalds 已提交
4579 4580 4581 4582 4583 4584 4585 4586
		}
		put_disk(disks[drive]);
	}

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

4587
	if (atomic_read(&usage_count))
L
Linus Torvalds 已提交
4588 4589 4590 4591 4592
		floppy_release_irq_and_dma();

	/* eject disk, if any */
	fd_eject(0);
}
4593

4594
module_exit(floppy_module_exit);
L
Linus Torvalds 已提交
4595 4596 4597 4598 4599 4600 4601 4602

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");

4603 4604
/* This doesn't actually get used other than for module information */
static const struct pnp_device_id floppy_pnpids[] = {
4605 4606
	{"PNP0700", 0},
	{}
4607
};
4608

4609 4610
MODULE_DEVICE_TABLE(pnp, floppy_pnpids);

L
Linus Torvalds 已提交
4611 4612 4613 4614 4615 4616 4617
#else

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

MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);