floppy.c 118.2 KB
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/*
 *  linux/drivers/block/floppy.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *  Copyright (C) 1993, 1994  Alain Knaff
 *  Copyright (C) 1998 Alan Cox
 */
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/*
 * 02.12.91 - Changed to static variables to indicate need for reset
 * and recalibrate. This makes some things easier (output_byte reset
 * checking etc), and means less interrupt jumping in case of errors,
 * so the code is hopefully easier to understand.
 */

/*
 * This file is certainly a mess. I've tried my best to get it working,
 * but I don't like programming floppies, and I have only one anyway.
 * Urgel. I should check for more errors, and do more graceful error
 * recovery. Seems there are problems with several drives. I've tried to
 * correct them. No promises.
 */

/*
 * As with hd.c, all routines within this file can (and will) be called
 * by interrupts, so extreme caution is needed. A hardware interrupt
 * handler may not sleep, or a kernel panic will happen. Thus I cannot
 * call "floppy-on" directly, but have to set a special timer interrupt
 * etc.
 */

/*
 * 28.02.92 - made track-buffering routines, based on the routines written
 * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus.
 */

/*
 * Automatic floppy-detection and formatting written by Werner Almesberger
 * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with
 * the floppy-change signal detection.
 */

/*
 * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
 * FDC data overrun bug, added some preliminary stuff for vertical
 * recording support.
 *
 * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
 *
 * TODO: Errors are still not counted properly.
 */

/* 1992/9/20
 * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
 * modeled after the freeware MS-DOS program fdformat/88 V1.8 by
 * Christoph H. Hochst\"atter.
 * I have fixed the shift values to the ones I always use. Maybe a new
 * ioctl() should be created to be able to modify them.
 * There is a bug in the driver that makes it impossible to format a
 * floppy as the first thing after bootup.
 */

/*
 * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
 * this helped the floppy driver as well. Much cleaner, and still seems to
 * work.
 */

/* 1994/6/24 --bbroad-- added the floppy table entries and made
 * minor modifications to allow 2.88 floppies to be run.
 */

/* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
 * disk types.
 */

/*
 * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger
 * format bug fixes, but unfortunately some new bugs too...
 */

/* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write
 * errors to allow safe writing by specialized programs.
 */

/* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks
 * by defining bit 1 of the "stretch" parameter to mean put sectors on the
 * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's
 * drives are "upside-down").
 */

/*
 * 1995/8/26 -- Andreas Busse -- added Mips support.
 */

/*
 * 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependent
 * features to asm/floppy.h.
 */

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

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

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

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

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

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

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

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

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

#define FLOPPY_SANITY_CHECK
#undef  FLOPPY_SILENT_DCL_CLEAR

#define REALLY_SLOW_IO

#define DEBUGT 2
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#define DCL_DEBUG		/* debug disk change line */
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#ifdef DCL_DEBUG
#define debug_dcl(test, fmt, args...) \
	do { if ((test) & FD_DEBUG) DPRINT(fmt, ##args); } while (0)
#else
#define debug_dcl(test, fmt, args...) \
	do { if (0) DPRINT(fmt, ##args); } while (0)
#endif


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/* do print messages for unexpected interrupts */
static int print_unex = 1;
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#define FDPATCHES
#include <linux/fdreg.h>
#include <linux/fd.h>
#include <linux/hdreg.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/bio.h>
#include <linux/string.h>
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#include <linux/jiffies.h>
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#include <linux/fcntl.h>
#include <linux/delay.h>
#include <linux/mc146818rtc.h>	/* CMOS defines */
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/mod_devicetable.h>
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#include <linux/buffer_head.h>	/* for invalidate_buffers() */
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#include <linux/mutex.h>
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#include <linux/io.h>
#include <linux/uaccess.h>
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/*
 * PS/2 floppies have much slower step rates than regular floppies.
 * It's been recommended that take about 1/4 of the default speed
 * in some more extreme cases.
 */
static int slow_floppy;

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

static int FLOPPY_IRQ = 6;
static int FLOPPY_DMA = 2;
static int can_use_virtual_dma = 2;
/* =======
 * can use virtual DMA:
 * 0 = use of virtual DMA disallowed by config
 * 1 = use of virtual DMA prescribed by config
 * 2 = no virtual DMA preference configured.  By default try hard DMA,
 * but fall back on virtual DMA when not enough memory available
 */

static int use_virtual_dma;
/* =======
 * use virtual DMA
 * 0 using hard DMA
 * 1 using virtual DMA
 * This variable is set to virtual when a DMA mem problem arises, and
 * reset back in floppy_grab_irq_and_dma.
 * It is not safe to reset it in other circumstances, because the floppy
 * driver may have several buffers in use at once, and we do currently not
 * record each buffers capabilities
 */

static DEFINE_SPINLOCK(floppy_lock);

static unsigned short virtual_dma_port = 0x3f0;
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irqreturn_t floppy_interrupt(int irq, void *dev_id);
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static int set_dor(int fdc, char mask, char data);

#define K_64	0x10000		/* 64KB */

/* the following is the mask of allowed drives. By default units 2 and
 * 3 of both floppy controllers are disabled, because switching on the
 * motor of these drives causes system hangs on some PCI computers. drive
 * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
 * a drive is allowed.
 *
 * NOTE: This must come before we include the arch floppy header because
 *       some ports reference this variable from there. -DaveM
 */

static int allowed_drive_mask = 0x33;

#include <asm/floppy.h>

static int irqdma_allocated;

#define DEVICE_NAME "floppy"

#include <linux/blkdev.h>
#include <linux/blkpg.h>
#include <linux/cdrom.h>	/* for the compatibility eject ioctl */
#include <linux/completion.h>

static struct request *current_req;
static struct request_queue *floppy_queue;
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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;
static int initialising = 1;

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#define ITYPE(x)	(((x) >> 2) & 0x1f)
#define TOMINOR(x)	((x & 3) | ((x & 4) << 5))
#define UNIT(x)		((x) & 0x03)		/* drive on fdc */
#define FDC(x)		(((x) & 0x04) >> 2)	/* fdc of drive */
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	/* reverse mapping from unit and fdc to drive */
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#define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))

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

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

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

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

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

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

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

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

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

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

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

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

static struct floppy_drive_params drive_params[N_DRIVE];
static struct floppy_drive_struct drive_state[N_DRIVE];
static struct floppy_write_errors write_errors[N_DRIVE];
static struct timer_list motor_off_timer[N_DRIVE];
static struct gendisk *disks[N_DRIVE];
static struct block_device *opened_bdev[N_DRIVE];
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static DEFINE_MUTEX(open_lock);
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static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;

/*
 * This struct defines the different floppy types.
 *
 * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
 * types (e.g. 360kB diskette in 1.2MB drive, etc.).  Bit 1 of 'stretch'
 * tells if the disk is in Commodore 1581 format, which means side 0 sectors
 * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
 * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
 * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
 * side 0 is on physical side 0 (but with the misnamed sector IDs).
 * 'stretch' should probably be renamed to something more general, like
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 * 'options'.
 *
 * Bits 2 through 9 of 'stretch' tell the number of the first sector.
 * The LSB (bit 2) is flipped. For most disks, the first sector
 * is 1 (represented by 0x00<<2).  For some CP/M and music sampler
 * disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2).
 * For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2).
 *
 * Other parameters should be self-explanatory (see also setfdprm(8)).
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 */
/*
	    Size
	     |  Sectors per track
	     |  | Head
	     |  | |  Tracks
	     |  | |  | Stretch
	     |  | |  | |  Gap 1 size
	     |  | |  | |    |  Data rate, | 0x40 for perp
	     |  | |  | |    |    |  Spec1 (stepping rate, head unload
	     |  | |  | |    |    |    |    /fmt gap (gap2) */
static struct floppy_struct floppy_type[32] = {
	{    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    },	/*  0 no testing    */
	{  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
	{ 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" },	/*  2 1.2MB AT      */
	{  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  },	/*  3 360KB SS 3.5" */
	{ 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  },	/*  4 720KB 3.5"    */
	{  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  },	/*  5 360KB AT      */
	{ 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  },	/*  6 720KB AT      */
	{ 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" },	/*  7 1.44MB 3.5"   */
	{ 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" },	/*  8 2.88MB 3.5"   */
	{ 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" },	/*  9 3.12MB 3.5"   */

	{ 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
	{ 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
	{  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  },	/* 12 410KB 5.25"   */
	{ 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  },	/* 13 820KB 3.5"    */
	{ 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" },	/* 14 1.48MB 5.25"  */
	{ 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" },	/* 15 1.72MB 3.5"   */
	{  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  },	/* 16 420KB 5.25"   */
	{ 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  },	/* 17 830KB 3.5"    */
	{ 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" },	/* 18 1.49MB 5.25"  */
	{ 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */

	{ 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880"  }, /* 20 880KB 5.25"   */
	{ 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
	{ 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5"   */
	{ 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
	{ 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
	{ 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
	{ 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
	{ 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
	{ 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
	{ 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5"   */
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	{ 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  },	/* 30 800KB 3.5"    */
	{ 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
};

#define SECTSIZE (_FD_SECTSIZE(*floppy))

/* Auto-detection: Disk type used until the next media change occurs. */
static struct floppy_struct *current_type[N_DRIVE];

/*
 * User-provided type information. current_type points to
 * the respective entry of this array.
 */
static struct floppy_struct user_params[N_DRIVE];

static sector_t floppy_sizes[256];

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static char floppy_device_name[] = "floppy";

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/*
 * The driver is trying to determine the correct media format
 * while probing is set. rw_interrupt() clears it after a
 * successful access.
 */
static int probing;

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

#define NO_SIGNAL (!interruptible || !signal_pending(current))
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#define CALL(x)		if ((x) == -EINTR) return -EINTR
#define ECALL(x)	if ((ret = (x))) return ret;
#define _WAIT(x,i)	CALL(ret=wait_til_done((x),i))
#define WAIT(x)		_WAIT((x),interruptible)
#define IWAIT(x)	_WAIT((x),1)
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/* Errors during formatting are counted here. */
static int format_errors;

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

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

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

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

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

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

/*
 * The "reset" variable should be tested whenever an interrupt is scheduled,
 * after the commands have been sent. This is to ensure that the driver doesn't
 * get wedged when the interrupt doesn't come because of a failed command.
 * reset doesn't need to be tested before sending commands, because
 * output_byte is automatically disabled when reset is set.
 */
static void reset_fdc(void);

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

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

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

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

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

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

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

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

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

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

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

#define OLOGSIZE 20

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

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

static int output_log_pos;
#endif

#define current_reqD -1
#define MAXTIMEOUT -2

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

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

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

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#define INFBOUND(a, b) (a) = max_t(int, a, b)
#define SUPBOUND(a, b) (a) = min_t(int, a, b)
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/*
 * Bottom half floppy driver.
 * ==========================
 *
 * This part of the file contains the code talking directly to the hardware,
 * and also the main service loop (seek-configure-spinup-command)
 */

/*
 * disk change.
 * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
 * and the last_checked date.
 *
 * last_checked is the date of the last check which showed 'no disk change'
 * FD_DISK_CHANGE is set under two conditions:
 * 1. The floppy has been changed after some i/o to that floppy already
 *    took place.
 * 2. No floppy disk is in the drive. This is done in order to ensure that
 *    requests are quickly flushed in case there is no disk in the drive. It
 *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
 *    the drive.
 *
 * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
 * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
 *  each seek. If a disk is present, the disk change line should also be
 *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
 *  change line is set, this means either that no disk is in the drive, or
 *  that it has been removed since the last seek.
 *
 * This means that we really have a third possibility too:
 *  The floppy has been changed after the last seek.
 */

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

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

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

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

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

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

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;
}

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

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

/* selects the fdc and drive, and enables the fdc's input/dma. */
static void set_fdc(int drive)
{
	if (drive >= 0 && drive < N_DRIVE) {
		fdc = FDC(drive);
		current_drive = drive;
	}
	if (fdc != 1 && fdc != 0) {
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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 */
static int _lock_fdc(int drive, int interruptible, int line)
{
	if (!usage_count) {
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		pr_err("Trying to lock fdc while usage count=0 at line %d\n",
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		       line);
		return -1;
	}

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

		for (;;) {
			set_current_state(TASK_INTERRUPTIBLE);

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

			schedule();

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

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

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

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

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

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

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

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

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

	del_timer(motor_off_timer + drive);

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

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

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

static void empty(void)
{
}

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

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

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

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

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

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

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

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

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

static void floppy_enable_hlt(void)
{
	unsigned long flags;

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

static void setup_DMA(void)
{
	unsigned long f;

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

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

static void show_floppy(void);

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

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

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

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

#define MORE_OUTPUT -2
/* does the fdc need more output? */
static int need_more_output(void)
{
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	int status = wait_til_ready();
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	if (status < 0)
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		return -1;
	if ((status & (STATUS_READY | STATUS_DIR | STATUS_DMA)) == STATUS_READY)
		return MORE_OUTPUT;
	return result();
}

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

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

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

static int fifo_depth = 0xa;
static int no_fifo;

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

#define NOMINAL_DTR 500

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

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

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

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

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

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

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

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

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

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

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

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

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

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static void print_errors(void)
{
	DPRINT("");
	if (ST0 & ST0_ECE) {
		pr_cont("Recalibrate failed!");
	} else if (ST2 & ST2_CRC) {
		pr_cont("data CRC error");
		tell_sector();
	} else if (ST1 & ST1_CRC) {
		pr_cont("CRC error");
		tell_sector();
	} else if ((ST1 & (ST1_MAM | ST1_ND)) ||
		   (ST2 & ST2_MAM)) {
		if (!probing) {
			pr_cont("sector not found");
			tell_sector();
		} else
			pr_cont("probe failed...");
	} else if (ST2 & ST2_WC) {	/* seek error */
		pr_cont("wrong cylinder");
	} else if (ST2 & ST2_BC) {	/* cylinder marked as bad */
		pr_cont("bad cylinder");
	} else {
		pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
			ST0, ST1, ST2);
		tell_sector();
	}
	pr_cont("\n");
}

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

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

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

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

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

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

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

	if (flags & FD_RAW_INTR)
		do_floppy = main_command_interrupt;

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

	debugt("rw_command: ");

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

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

static int blind_seek;

/*
 * This is the routine called after every seek (or recalibrate) interrupt
 * from the floppy controller.
 */
static void seek_interrupt(void)
{
	debugt("seek interrupt:");
	if (inr != 2 || (ST0 & 0xF8) != 0x20) {
		DPRINT("seek failed\n");
		DRS->track = NEED_2_RECAL;
		cont->error();
		cont->redo();
		return;
	}
	if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) {
1581 1582 1583
		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)
{
1594 1595
	if (test_bit(FD_VERIFY_BIT, &DRS->flags)) {
					/* check write protection */
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		output_byte(FD_GETSTATUS);
		output_byte(UNIT(current_drive));
		if (result() != 1) {
			FDCS->reset = 1;
			return;
		}
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		clear_bit(FD_VERIFY_BIT, &DRS->flags);
		clear_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
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		debug_dcl(DP->flags,
			  "checking whether disk is write protected\n");
		debug_dcl(DP->flags, "wp=%x\n", ST3 & 0x40);
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		if (!(ST3 & 0x40))
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			set_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
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		else
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			clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
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	}
}

static void seek_floppy(void)
{
	int track;

	blind_seek = 0;

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	debug_dcl(DP->flags, "calling disk change from seek\n");
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	if (!test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
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	    disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
		/* the media changed flag should be cleared after the seek.
		 * If it isn't, this means that there is really no disk in
		 * the drive.
		 */
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		set_bit(FD_DISK_CHANGED_BIT, &DRS->flags);
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		cont->done(0);
		cont->redo();
		return;
	}
	if (DRS->track <= NEED_1_RECAL) {
		recalibrate_floppy();
		return;
1636
	} else if (test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
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		   (raw_cmd->flags & FD_RAW_NEED_DISK) &&
		   (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
		/* we seek to clear the media-changed condition. Does anybody
		 * know a more elegant way, which works on all drives? */
		if (raw_cmd->track)
			track = raw_cmd->track - 1;
		else {
			if (DP->flags & FD_SILENT_DCL_CLEAR) {
				set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
				blind_seek = 1;
				raw_cmd->flags |= FD_RAW_NEED_SEEK;
			}
			track = 1;
		}
	} else {
		check_wp();
		if (raw_cmd->track != DRS->track &&
		    (raw_cmd->flags & FD_RAW_NEED_SEEK))
			track = raw_cmd->track;
		else {
			setup_rw_floppy();
			return;
		}
	}

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

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

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

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

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

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

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

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

	do_print = !handler && print_unex && !initialising;

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

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

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

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

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

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

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

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

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

static void show_floppy(void)
{
	int i;

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	pr_info("\n");
	pr_info("floppy driver state\n");
	pr_info("-------------------\n");
	pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%p\n",
		jiffies, interruptjiffies, jiffies - interruptjiffies,
		lasthandler);
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#ifdef FLOPPY_SANITY_CHECK
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	pr_info("timeout_message=%s\n", timeout_message);
	pr_info("last output bytes:\n");
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	for (i = 0; i < OLOGSIZE; i++)
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		pr_info("%2x %2x %lu\n",
			output_log[(i + output_log_pos) % OLOGSIZE].data,
			output_log[(i + output_log_pos) % OLOGSIZE].status,
			output_log[(i + output_log_pos) % OLOGSIZE].jiffies);
	pr_info("last result at %lu\n", resultjiffies);
	pr_info("last redo_fd_request at %lu\n", lastredo);
	print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1,
		       reply_buffer, resultsize, true);
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#endif

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

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

	if (!initialising)
		show_floppy();
	cancel_activity();

	floppy_enable_hlt();

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	schedule_bh(handler);

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

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

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

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

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

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

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

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

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

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

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

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

static int next_valid_format(void)
{
	int probed_format;

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

static void bad_flp_intr(void)
{
	int err_count;

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

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

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

#define CODE2SIZE (ssize = ((1 << SIZECODE) + 3) >> 2)
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#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)
{
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	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;

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

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

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

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

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

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

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

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

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

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

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	if (lock_fdc(drive, 1))
		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;
	IWAIT(redo_format);
	process_fd_request();
	return ret;
}

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

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

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

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

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

	if (uptodate) {
		/* maintain values for invalidation on geometry
		 * change */
2318
		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);
2325
		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) {
2332
				DRWE->first_error_sector = blk_rq_pos(req);
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				DRWE->first_error_generation = DRS->generation;
			}
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			DRWE->last_error_sector = blk_rq_pos(req);
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			DRWE->last_error_generation = DRS->generation;
		}
		spin_lock_irqsave(q->queue_lock, flags);
2339
		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)
{
2347 2348 2349 2350
	int eoc;
	int ssize;
	int heads;
	int nr_sectors;
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	if (R_HEAD >= 2) {
		/* some Toshiba floppy controllers occasionnally seem to
		 * return bogus interrupts after read/write operations, which
		 * can be recognized by a bad head number (>= 2) */
		return;
	}

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

	nr_sectors = 0;
	CODE2SIZE;

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

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

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

#ifdef FLOPPY_SANITY_CHECK
	if (nr_sectors / ssize >
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	    DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
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		DPRINT("long rw: %x instead of %lx\n",
		       nr_sectors, current_count_sectors);
2384 2385 2386 2387 2388 2389 2390
		pr_info("rs=%d s=%d\n", R_SECTOR, SECTOR);
		pr_info("rh=%d h=%d\n", R_HEAD, HEAD);
		pr_info("rt=%d t=%d\n", R_TRACK, TRACK);
		pr_info("heads=%d eoc=%d\n", heads, eoc);
		pr_info("spt=%d st=%d ss=%d\n",
			SECT_PER_TRACK, fsector_t, ssize);
		pr_info("in_sector_offset=%d\n", in_sector_offset);
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	}
#endif

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

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

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

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

/* Compute maximal contiguous buffer size. */
static int buffer_chain_size(void)
{
	struct bio_vec *bv;
2444 2445
	int size;
	struct req_iterator iter;
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	char *base;

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

2451 2452 2453
	rq_for_each_segment(bv, current_req, iter) {
		if (page_address(bv->bv_page) + bv->bv_offset != base + size)
			break;
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2455
		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;
2482 2483
	char *buffer;
	char *dma_buffer;
2484 2485
	int size;
	struct req_iterator iter;
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	max_sector = transfer_size(ssize,
				   min(max_sector, max_sector_2),
2489
				   blk_rq_sectors(current_req));
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	if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2492
	    buffer_max > fsector_t + blk_rq_sectors(current_req))
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		current_count_sectors = min_t(int, buffer_max - fsector_t,
2494
					      blk_rq_sectors(current_req));
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	remaining = current_count_sectors << 9;
#ifdef FLOPPY_SANITY_CHECK
2498
	if (remaining > blk_rq_bytes(current_req) && CT(COMMAND) == FD_WRITE) {
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		DPRINT("in copy buffer\n");
2500 2501 2502 2503 2504 2505 2506 2507
		pr_info("current_count_sectors=%ld\n", current_count_sectors);
		pr_info("remaining=%d\n", remaining >> 9);
		pr_info("current_req->nr_sectors=%u\n",
			blk_rq_sectors(current_req));
		pr_info("current_req->current_nr_sectors=%u\n",
			blk_rq_cur_sectors(current_req));
		pr_info("max_sector=%d\n", max_sector);
		pr_info("ssize=%d\n", ssize);
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	}
#endif

	buffer_max = max(max_sector, buffer_max);

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

2515
	size = blk_rq_cur_bytes(current_req);
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2517 2518 2519
	rq_for_each_segment(bv, current_req, iter) {
		if (!remaining)
			break;
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2521 2522
		size = bv->bv_len;
		SUPBOUND(size, remaining);
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2524
		buffer = page_address(bv->bv_page) + bv->bv_offset;
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#ifdef FLOPPY_SANITY_CHECK
2526 2527 2528 2529
		if (dma_buffer + size >
		    floppy_track_buffer + (max_buffer_sectors << 10) ||
		    dma_buffer < floppy_track_buffer) {
			DPRINT("buffer overrun in copy buffer %d\n",
2530 2531 2532 2533 2534
			       (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)
2536
				pr_info("read\n");
2537
			if (CT(COMMAND) == FD_WRITE)
2538
				pr_info("write\n");
2539
			break;
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		}
2541 2542 2543 2544 2545 2546 2547 2548 2549 2550
		if (((unsigned long)buffer) % 512)
			DPRINT("%p buffer not aligned\n", buffer);
#endif
		if (CT(COMMAND) == FD_READ)
			memcpy(buffer, dma_buffer, size);
		else
			memcpy(dma_buffer, buffer, size);

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

/* work around a bug in pseudo DMA
 * (on some FDCs) pseudo DMA does not stop when the CPU stops
 * sending data.  Hence we need a different way to signal the
 * transfer length:  We use SECT_PER_TRACK.  Unfortunately, this
 * does not work with MT, hence we can only transfer one head at
 * a time
 */
static void virtualdmabug_workaround(void)
{
2570 2571
	int hard_sectors;
	int end_sector;
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	if (CT(COMMAND) == FD_WRITE) {
		COMMAND &= ~0x80;	/* switch off multiple track mode */

		hard_sectors = raw_cmd->length >> (7 + SIZECODE);
		end_sector = SECTOR + hard_sectors - 1;
#ifdef FLOPPY_SANITY_CHECK
		if (end_sector > SECT_PER_TRACK) {
2580 2581
			pr_info("too many sectors %d > %d\n",
				end_sector, SECT_PER_TRACK);
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			return;
		}
#endif
2585 2586 2587
		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;
2604 2605 2606 2607
	int max_sector;
	int max_size;
	int tracksize;
	int ssize;
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	if (max_buffer_sectors == 0) {
2610
		pr_info("VFS: Block I/O scheduled on unopened device\n");
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		return 0;
	}

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

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

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

2633 2634
	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) {
2636
		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;

2644
	if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
2645 2646
	     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,
2655
				  blk_rq_sectors(current_req));
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			return 1;
		}
		SIZECODE = 2;
	} else
		SIZECODE = FD_SIZECODE(_floppy);
	raw_cmd->rate = _floppy->rate & 0x43;
	if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2)
		raw_cmd->rate = 1;

	if (SIZECODE)
		SIZECODE2 = 0xff;
	else
		SIZECODE2 = 0x80;
	raw_cmd->track = TRACK << STRETCH(_floppy);
	DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD);
	GAP = _floppy->gap;
	CODE2SIZE;
	SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
	SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
2675
	    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;
2706
	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;
		}
2715
	} else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
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		if (CT(COMMAND) == FD_WRITE) {
2717 2718 2719 2720
			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();
2741 2742
		dma_limit = (MAX_DMA_ADDRESS -
			     ((unsigned long)current_req->buffer)) >> 9;
2743
		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 &&
2760 2761 2762
		     *errors < DP->max_errors.read_track &&
		     ((!probing ||
		       (DP->read_track & (1 << DRS->probed_format)))))) {
2763
			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) {
2768 2769
				DPRINT("zero dma transfer attempted from make_raw_request\n");
				DPRINT("indirect=%d direct=%d fsector_t=%d\n",
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				       indirect, direct, fsector_t);
				return 0;
			}
			virtualdmabug_workaround();
			return 2;
		}
	}

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

	/* claim buffer track if needed */
	if (buffer_track != raw_cmd->track ||	/* bad track */
	    buffer_drive != current_drive ||	/* bad drive */
	    fsector_t > buffer_max ||
	    fsector_t < buffer_min ||
	    ((CT(COMMAND) == FD_READ ||
2787
	      (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
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	     max_sector > 2 * max_buffer_sectors + buffer_min &&
2789 2790
	     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 +
2796
		((aligned_sector_t - buffer_min) << 9);
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	if (CT(COMMAND) == FD_WRITE) {
		/* copy write buffer to track buffer.
		 * if we get here, we know that the write
		 * is either aligned or the data already in the buffer
		 * (buffer will be overwritten) */
#ifdef FLOPPY_SANITY_CHECK
		if (in_sector_offset && buffer_track == -1)
			DPRINT("internal error offset !=0 on write\n");
#endif
		buffer_track = raw_cmd->track;
		buffer_drive = current_drive;
		copy_buffer(ssize, max_sector,
			    2 * max_buffer_sectors + buffer_min);
	} else
		transfer_size(ssize, max_sector,
			      2 * max_buffer_sectors + buffer_min -
			      aligned_sector_t);

	/* round up current_count_sectors to get dma xfer size */
	raw_cmd->length = in_sector_offset + current_count_sectors;
	raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
	raw_cmd->length <<= 9;
#ifdef FLOPPY_SANITY_CHECK
	if ((raw_cmd->length < current_count_sectors << 9) ||
	    (raw_cmd->kernel_data != current_req->buffer &&
	     CT(COMMAND) == FD_WRITE &&
	     (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
	      aligned_sector_t < buffer_min)) ||
	    raw_cmd->length % (128 << SIZECODE) ||
	    raw_cmd->length <= 0 || current_count_sectors <= 0) {
		DPRINT("fractionary current count b=%lx s=%lx\n",
		       raw_cmd->length, current_count_sectors);
		if (raw_cmd->kernel_data != current_req->buffer)
2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843
			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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		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");
2854 2855 2856 2857
			pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n",
				fsector_t, buffer_min, raw_cmd->length >> 9);
			pr_info("current_count_sectors=%ld\n",
				current_count_sectors);
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			if (CT(COMMAND) == FD_READ)
2859
				pr_info("read\n");
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			if (CT(COMMAND) == FD_WRITE)
2861
				pr_info("write\n");
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			return 0;
		}
2864
	} else if (raw_cmd->length > blk_rq_bytes(current_req) ||
2865
		   current_count_sectors > blk_rq_sectors(current_req)) {
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		DPRINT("buffer overrun in direct transfer\n");
		return 0;
	} else if (raw_cmd->length < current_count_sectors << 9) {
		DPRINT("more sectors than bytes\n");
2870 2871
		pr_info("bytes=%ld\n", raw_cmd->length >> 9);
		pr_info("sectors=%ld\n", current_count_sectors);
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	}
	if (raw_cmd->length == 0) {
		DPRINT("zero dma transfer attempted from make_raw_request\n");
		return 0;
	}
#endif

	virtualdmabug_workaround();
	return 2;
}

static void redo_fd_request(void)
{
#define REPEAT {request_done(0); continue; }
	int drive;
	int tmp;

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

	for (;;) {
		if (!current_req) {
			struct request *req;

			spin_lock_irq(floppy_queue->queue_lock);
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			req = blk_fetch_request(floppy_queue);
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			spin_unlock_irq(floppy_queue->queue_lock);
			if (!req) {
				do_floppy = NULL;
				unlock_fdc();
				return;
			}
			current_req = req;
		}
		drive = (long)current_req->rq_disk->private_data;
		set_fdc(drive);
		reschedule_timeout(current_reqD, "redo fd request", 0);

		set_floppy(drive);
		raw_cmd = &default_raw_cmd;
		raw_cmd->flags = 0;
		if (start_motor(redo_fd_request))
			return;
		disk_change(current_drive);
		if (test_bit(current_drive, &fake_change) ||
2918
		    test_bit(FD_DISK_CHANGED_BIT, &DRS->flags)) {
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			DPRINT("disk absent or changed during operation\n");
			REPEAT;
		}
		if (!_floppy) {	/* Autodetection */
			if (!probing) {
				DRS->probed_format = 0;
				if (next_valid_format()) {
					DPRINT("no autodetectable formats\n");
					_floppy = NULL;
					REPEAT;
				}
			}
			probing = 1;
			_floppy =
			    floppy_type + DP->autodetect[DRS->probed_format];
		} else
			probing = 0;
		errors = &(current_req->errors);
		tmp = make_raw_rw_request();
		if (tmp < 2) {
			request_done(tmp);
			continue;
		}

2943
		if (test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags))
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			twaddle();
		schedule_bh(floppy_start);
		debugt("queue fd request");
		return;
	}
#undef REPEAT
}

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

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

2965
static void do_fd_request(struct request_queue *q)
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{
	if (max_buffer_sectors == 0) {
2968
		pr_info("VFS: do_fd_request called on non-open device\n");
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		return;
	}

	if (usage_count == 0) {
2973 2974 2975 2976 2977
		pr_info("warning: usage count=0, current_req=%p exiting\n",
			current_req);
		pr_info("sect=%ld type=%x flags=%x\n",
			(long)blk_rq_pos(current_req), current_req->cmd_type,
			current_req->cmd_flags);
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		return;
	}
	if (test_bit(0, &fdc_busy)) {
		/* fdc busy, this new request will be treated when the
		   current one is done */
		is_alive("do fd request, old request running");
		return;
	}
	lock_fdc(MAXTIMEOUT, 0);
	process_fd_request();
	is_alive("do fd request");
}

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

static int poll_drive(int interruptible, int flag)
{
	int ret;
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	/* no auto-sense, just clear dcl */
	raw_cmd = &default_raw_cmd;
	raw_cmd->flags = flag;
	raw_cmd->track = 0;
	raw_cmd->cmd_count = 0;
	cont = &poll_cont;
3008
	debug_dcl(DP->flags, "setting NEWCHANGE in poll_drive\n");
3009
	set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
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	WAIT(floppy_ready);
	return ret;
}

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

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

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

static int user_reset_fdc(int drive, int arg, int interruptible)
{
	int ret;

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

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	if (arg == FD_RESET_ALWAYS)
		FDCS->reset = 1;
	if (FDCS->reset) {
		cont = &reset_cont;
		WAIT(reset_fdc);
	}
	process_fd_request();
3045
	return 0;
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}

/*
 * Misc Ioctl's and support
 * ========================
 */
static inline int fd_copyout(void __user *param, const void *address,
			     unsigned long size)
{
	return copy_to_user(param, address, size) ? -EFAULT : 0;
}

3058 3059
static inline int fd_copyin(void __user *param, void *address,
			    unsigned long size)
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{
	return copy_from_user(address, param, size) ? -EFAULT : 0;
}

3064 3065 3066 3067
#define _COPYOUT(x)	(copy_to_user((void __user *)param, &(x), sizeof(x)) \
			 ? -EFAULT : 0)
#define _COPYIN(x)	(copy_from_user(&(x), (void __user *)param, sizeof(x)) \
			 ? -EFAULT : 0)
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3069 3070
#define COPYOUT(x)	ECALL(_COPYOUT(x))
#define COPYIN(x)	ECALL(_COPYIN(x))
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static inline const char *drive_name(int type, int drive)
{
	struct floppy_struct *floppy;

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

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

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

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

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

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

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

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

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

	while (ptr) {
		COPYOUT(*ptr);
		param += sizeof(struct floppy_raw_cmd);
		if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3151 3152 3153
			if (ptr->length >= 0 &&
			    ptr->length <= ptr->buffer_length) {
				long length = ptr->buffer_length - ptr->length;
3154 3155 3156 3157
				ret = fd_copyout(ptr->data, ptr->kernel_data,
						 length);
				if (ret)
					return ret;
3158
			}
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		}
		ptr = ptr->next;
	}
	return 0;
}

static void raw_cmd_free(struct floppy_raw_cmd **ptr)
{
3167 3168
	struct floppy_raw_cmd *next;
	struct floppy_raw_cmd *this;
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	this = *ptr;
	*ptr = NULL;
	while (this) {
		if (this->buffer_length) {
			fd_dma_mem_free((unsigned long)this->kernel_data,
					this->buffer_length);
			this->buffer_length = 0;
		}
		next = this->next;
		kfree(this);
		this = next;
	}
}

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

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

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

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

static int raw_cmd_ioctl(int cmd, void __user *param)
{
	struct floppy_raw_cmd *my_raw_cmd;
3244 3245 3246
	int drive;
	int ret2;
	int ret;
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	if (FDCS->rawcmd <= 1)
		FDCS->rawcmd = 1;
	for (drive = 0; drive < N_DRIVE; drive++) {
		if (FDC(drive) != fdc)
			continue;
		if (drive == current_drive) {
			if (UDRS->fd_ref > 1) {
				FDCS->rawcmd = 2;
				break;
			}
		} else if (UDRS->fd_ref) {
			FDCS->rawcmd = 2;
			break;
		}
	}

	if (FDCS->reset)
		return -EIO;

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

	raw_cmd = my_raw_cmd;
	cont = &raw_cmd_cont;
	ret = wait_til_done(floppy_start, 1);
3276
	debug_dcl(DP->flags, "calling disk change from raw_cmd ioctl\n");
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	if (ret != -EINTR && FDCS->reset)
		ret = -EIO;

	DRS->track = NO_TRACK;

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

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

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

	/* sanity checking for parameters. */
	if (g->sect <= 0 ||
	    g->head <= 0 ||
	    g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
	    /* check if reserved bits are set */
3309
	    (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
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		return -EINVAL;
	if (type) {
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;
3314
		mutex_lock(&open_lock);
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		if (lock_fdc(drive, 1)) {
			mutex_unlock(&open_lock);
			return -EINTR;
		}
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		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;
3329
			__invalidate_device(bdev);
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		}
3331
		mutex_unlock(&open_lock);
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	} else {
		int oldStretch;
3334 3335 3336

		if (lock_fdc(drive, 1))
			return -EINTR;
3337
		if (cmd != FDDEFPRM) {
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			/* notice a disk change immediately, else
			 * we lose our settings immediately*/
3340 3341 3342
			if (poll_drive(1, FD_RAW_NEED_DISK) == -EINTR)
				return -EINTR;
		}
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		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) &
3361
		     (FD_SWAPSIDES | FD_SECTBASEMASK)))
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			invalidate_drive(bdev);
		else
			process_fd_request();
	}
	return 0;
}

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

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

	for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
		if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
			*size = _IOC_SIZE(*cmd);
			*cmd = ioctl_table[i];
			if (*size > _IOC_SIZE(*cmd)) {
3407
				pr_info("ioctl not yet supported\n");
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				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 {
3421 3422
		if (lock_fdc(drive, 0))
			return -EINTR;
3423 3424
		if (poll_drive(0, 0) == -EINTR)
			return -EINTR;
L
Linus Torvalds 已提交
3425 3426 3427 3428 3429 3430 3431 3432
		process_fd_request();
		*g = current_type[drive];
	}
	if (!*g)
		return -ENODEV;
	return 0;
}

3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449
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
3450
static int fd_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
L
Linus Torvalds 已提交
3451 3452
		    unsigned long param)
{
A
Al Viro 已提交
3453
#define FD_IOCTL_ALLOWED (mode & (FMODE_WRITE|FMODE_WRITE_IOCTL))
L
Linus Torvalds 已提交
3454

A
Al Viro 已提交
3455
	int drive = (long)bdev->bd_disk->private_data;
3456 3457
	int type = ITYPE(UDRS->fd_device);
	int i;
L
Linus Torvalds 已提交
3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471
	int ret;
	int size;
	union inparam {
		struct floppy_struct g;	/* geometry */
		struct format_descr f;
		struct floppy_max_errors max_errors;
		struct floppy_drive_params dp;
	} inparam;		/* parameters coming from user space */
	const char *outparam;	/* parameters passed back to user space */

	/* convert compatibility eject ioctls into floppy eject ioctl.
	 * We do this in order to provide a means to eject floppy disks before
	 * installing the new fdutils package */
	if (cmd == CDROMEJECT ||	/* CD-ROM eject */
3472
	    cmd == 0x6470) {		/* SunOS floppy eject */
L
Linus Torvalds 已提交
3473 3474 3475 3476 3477
		DPRINT("obsolete eject ioctl\n");
		DPRINT("please use floppycontrol --eject\n");
		cmd = FDEJECT;
	}

3478
	if (!((cmd & 0xff00) == 0x0200))
L
Linus Torvalds 已提交
3479 3480
		return -EINVAL;

3481
	/* convert the old style command into a new style command */
3482 3483 3484
	ret = normalize_ioctl(&cmd, &size);
	if (ret)
		return ret;
3485

L
Linus Torvalds 已提交
3486 3487 3488 3489 3490
	/* permission checks */
	if (((cmd & 0x40) && !FD_IOCTL_ALLOWED) ||
	    ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
		return -EPERM;

3491 3492 3493
	if (WARN_ON(size < 0 || size > sizeof(inparam)))
		return -EINVAL;

L
Linus Torvalds 已提交
3494
	/* copyin */
3495
	memset(&inparam, 0, sizeof(inparam));
3496 3497 3498 3499 3500
	if (_IOC_DIR(cmd) & _IOC_WRITE) {
		ret = fd_copyin((void __user *)param, &inparam, size);
		if (ret)
			return ret;
	}
L
Linus Torvalds 已提交
3501

3502 3503 3504 3505 3506
	switch (cmd) {
	case FDEJECT:
		if (UDRS->fd_ref != 1)
			/* somebody else has this drive open */
			return -EBUSY;
3507 3508
		if (lock_fdc(drive, 1))
			return -EINTR;
L
Linus Torvalds 已提交
3509

3510 3511 3512
		/* do the actual eject. Fails on
		 * non-Sparc architectures */
		ret = fd_eject(UNIT(drive));
L
Linus Torvalds 已提交
3513

3514 3515
		set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
		set_bit(FD_VERIFY_BIT, &UDRS->flags);
3516 3517 3518
		process_fd_request();
		return ret;
	case FDCLRPRM:
3519 3520
		if (lock_fdc(drive, 1))
			return -EINTR;
3521 3522 3523 3524 3525 3526 3527 3528
		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:
3529
		ret = get_floppy_geometry(drive, type,
3530
					  (struct floppy_struct **)
3531 3532 3533
					  &outparam);
		if (ret)
			return ret;
3534 3535 3536 3537 3538 3539 3540 3541
		break;
	case FDMSGON:
		UDP->flags |= FTD_MSG;
		return 0;
	case FDMSGOFF:
		UDP->flags &= ~FTD_MSG;
		return 0;
	case FDFMTBEG:
3542 3543
		if (lock_fdc(drive, 1))
			return -EINTR;
3544 3545
		if (poll_drive(1, FD_RAW_NEED_DISK) == -EINTR)
			return -EINTR;
3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558
		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:
3559 3560
		if (lock_fdc(drive, 1))
			return -EINTR;
3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581
		return invalidate_drive(bdev);
	case FDSETEMSGTRESH:
		UDP->max_errors.reporting = (unsigned short)(param & 0x0f);
		return 0;
	case FDGETMAXERRS:
		outparam = (const char *)&UDP->max_errors;
		break;
	case FDSETMAXERRS:
		UDP->max_errors = inparam.max_errors;
		break;
	case FDGETDRVTYP:
		outparam = drive_name(type, drive);
		SUPBOUND(size, strlen(outparam) + 1);
		break;
	case FDSETDRVPRM:
		*UDP = inparam.dp;
		break;
	case FDGETDRVPRM:
		outparam = (const char *)UDP;
		break;
	case FDPOLLDRVSTAT:
3582 3583
		if (lock_fdc(drive, 1))
			return -EINTR;
3584 3585
		if (poll_drive(1, FD_RAW_NEED_DISK) == -EINTR)
			return -EINTR;
3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603
		process_fd_request();
		/* fall through */
	case FDGETDRVSTAT:
		outparam = (const char *)UDRS;
		break;
	case FDRESET:
		return user_reset_fdc(drive, (int)param, 1);
	case FDGETFDCSTAT:
		outparam = (const char *)UFDCS;
		break;
	case FDWERRORCLR:
		memset(UDRWE, 0, sizeof(*UDRWE));
		return 0;
	case FDWERRORGET:
		outparam = (const char *)UDRWE;
		break;
	case FDRAWCMD:
		if (type)
L
Linus Torvalds 已提交
3604
			return -EINVAL;
3605 3606
		if (lock_fdc(drive, 1))
			return -EINTR;
3607
		set_floppy(drive);
3608 3609 3610
		i = raw_cmd_ioctl(cmd, (void __user *)param);
		if (i == -EINTR)
			return -EINTR;
3611 3612 3613
		process_fd_request();
		return i;
	case FDTWADDLE:
3614 3615
		if (lock_fdc(drive, 1))
			return -EINTR;
3616 3617 3618 3619 3620 3621
		twaddle();
		process_fd_request();
		return 0;
	default:
		return -EINVAL;
	}
L
Linus Torvalds 已提交
3622 3623 3624

	if (_IOC_DIR(cmd) & _IOC_READ)
		return fd_copyout((void __user *)param, outparam, size);
3625 3626

	return 0;
L
Linus Torvalds 已提交
3627 3628 3629 3630
}

static void __init config_types(void)
{
3631
	bool has_drive = false;
L
Linus Torvalds 已提交
3632 3633 3634 3635 3636 3637 3638 3639 3640 3641
	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;

3642
	/* FIXME: additional physical CMOS drive detection should go here */
L
Linus Torvalds 已提交
3643 3644 3645 3646 3647 3648 3649

	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];

3650
		if (type < ARRAY_SIZE(default_drive_params)) {
L
Linus Torvalds 已提交
3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662
			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) {
3663 3664 3665 3666 3667 3668 3669
			const char *prepend;
			if (!has_drive) {
				prepend = "";
				has_drive = true;
				pr_info("Floppy drive(s):");
			} else {
				prepend = ",";
L
Linus Torvalds 已提交
3670
			}
3671 3672

			pr_cont("%s fd%d is %s", prepend, drive, name);
L
Linus Torvalds 已提交
3673 3674 3675
		}
		*UDP = *params;
	}
3676 3677 3678

	if (has_drive)
		pr_cont("\n");
L
Linus Torvalds 已提交
3679 3680
}

A
Al Viro 已提交
3681
static int floppy_release(struct gendisk *disk, fmode_t mode)
L
Linus Torvalds 已提交
3682
{
A
Al Viro 已提交
3683
	int drive = (long)disk->private_data;
L
Linus Torvalds 已提交
3684

3685
	mutex_lock(&open_lock);
L
Linus Torvalds 已提交
3686 3687 3688 3689 3690 3691 3692 3693
	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;
3694
	mutex_unlock(&open_lock);
3695

L
Linus Torvalds 已提交
3696 3697 3698 3699 3700 3701 3702 3703
	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
3704
static int floppy_open(struct block_device *bdev, fmode_t mode)
L
Linus Torvalds 已提交
3705
{
A
Al Viro 已提交
3706 3707
	int drive = (long)bdev->bd_disk->private_data;
	int old_dev, new_dev;
L
Linus Torvalds 已提交
3708 3709 3710 3711
	int try;
	int res = -EBUSY;
	char *tmp;

3712
	mutex_lock(&open_lock);
L
Linus Torvalds 已提交
3713
	old_dev = UDRS->fd_device;
A
Al Viro 已提交
3714
	if (opened_bdev[drive] && opened_bdev[drive] != bdev)
L
Linus Torvalds 已提交
3715 3716 3717
		goto out2;

	if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) {
3718 3719
		set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
		set_bit(FD_VERIFY_BIT, &UDRS->flags);
L
Linus Torvalds 已提交
3720 3721
	}

A
Al Viro 已提交
3722
	if (UDRS->fd_ref == -1 || (UDRS->fd_ref && (mode & FMODE_EXCL)))
L
Linus Torvalds 已提交
3723 3724
		goto out2;

A
Al Viro 已提交
3725
	if (mode & FMODE_EXCL)
L
Linus Torvalds 已提交
3726 3727 3728 3729
		UDRS->fd_ref = -1;
	else
		UDRS->fd_ref++;

A
Al Viro 已提交
3730
	opened_bdev[drive] = bdev;
L
Linus Torvalds 已提交
3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747

	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);
		}
3748
		if (!tmp && !floppy_track_buffer)
L
Linus Torvalds 已提交
3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763
			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
3764 3765 3766 3767
	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
3768 3769 3770 3771 3772 3773 3774
		if (buffer_drive == drive)
			buffer_track = -1;
	}

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

A
Al Viro 已提交
3775 3776
	if (!(mode & FMODE_NDELAY)) {
		if (mode & (FMODE_READ|FMODE_WRITE)) {
L
Linus Torvalds 已提交
3777
			UDRS->last_checked = 0;
A
Al Viro 已提交
3778
			check_disk_change(bdev);
3779
			if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags))
L
Linus Torvalds 已提交
3780 3781 3782
				goto out;
		}
		res = -EROFS;
3783 3784
		if ((mode & FMODE_WRITE) &&
		    !test_bit(FD_DISK_WRITABLE_BIT, &UDRS->flags))
L
Linus Torvalds 已提交
3785 3786
			goto out;
	}
3787
	mutex_unlock(&open_lock);
L
Linus Torvalds 已提交
3788 3789 3790 3791 3792 3793 3794 3795 3796
	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:
3797
	mutex_unlock(&open_lock);
L
Linus Torvalds 已提交
3798 3799 3800 3801 3802 3803 3804 3805 3806 3807
	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;

3808 3809
	if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
	    test_bit(FD_VERIFY_BIT, &UDRS->flags))
L
Linus Torvalds 已提交
3810 3811
		return 1;

3812
	if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) {
L
Linus Torvalds 已提交
3813 3814 3815 3816 3817
		lock_fdc(drive, 0);
		poll_drive(0, 0);
		process_fd_request();
	}

3818 3819
	if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
	    test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
L
Linus Torvalds 已提交
3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831
	    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.
 */

3832
static void floppy_rb0_complete(struct bio *bio, int err)
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 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889
{
	complete((struct completion *)bio->bi_private);
}

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

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

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

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

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

	__free_page(page);

	return 0;
}

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

3890 3891 3892
	if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
	    test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
	    test_bit(drive, &fake_change) || NO_GEOM) {
L
Linus Torvalds 已提交
3893
		if (usage_count == 0) {
3894
			pr_info("VFS: revalidate called on non-open device.\n");
L
Linus Torvalds 已提交
3895 3896 3897
			return -EFAULT;
		}
		lock_fdc(drive, 0);
3898 3899
		cf = (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
		      test_bit(FD_VERIFY_BIT, &UDRS->flags));
L
Linus Torvalds 已提交
3900 3901 3902 3903 3904 3905 3906 3907 3908
		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);
3909
		clear_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
L
Linus Torvalds 已提交
3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924
		if (cf)
			UDRS->generation++;
		if (NO_GEOM) {
			/* auto-sensing */
			res = __floppy_read_block_0(opened_bdev[drive]);
		} else {
			if (cf)
				poll_drive(0, FD_RAW_NEED_DISK);
			process_fd_request();
		}
	}
	set_capacity(disk, floppy_sizes[UDRS->fd_device]);
	return res;
}

3925
static const struct block_device_operations floppy_fops = {
3926
	.owner			= THIS_MODULE,
A
Al Viro 已提交
3927 3928 3929
	.open			= floppy_open,
	.release		= floppy_release,
	.locked_ioctl		= fd_ioctl,
3930 3931 3932
	.getgeo			= fd_getgeo,
	.media_changed		= check_floppy_change,
	.revalidate_disk	= floppy_revalidate,
L
Linus Torvalds 已提交
3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948
};

/*
 * 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;
3949 3950
	r = result();
	if (r <= 0x00)
L
Linus Torvalds 已提交
3951 3952
		return FDC_NONE;	/* No FDC present ??? */
	if ((r == 1) && (reply_buffer[0] == 0x80)) {
3953
		pr_info("FDC %d is an 8272A\n", fdc);
L
Linus Torvalds 已提交
3954 3955 3956
		return FDC_8272A;	/* 8272a/765 don't know DUMPREGS */
	}
	if (r != 10) {
3957 3958
		pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
			fdc, r);
L
Linus Torvalds 已提交
3959 3960 3961 3962
		return FDC_UNKNOWN;
	}

	if (!fdc_configure()) {
3963
		pr_info("FDC %d is an 82072\n", fdc);
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3964 3965 3966 3967 3968 3969 3970
		return FDC_82072;	/* 82072 doesn't know CONFIGURE */
	}

	output_byte(FD_PERPENDICULAR);
	if (need_more_output() == MORE_OUTPUT) {
		output_byte(0);
	} else {
3971
		pr_info("FDC %d is an 82072A\n", fdc);
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3972 3973 3974 3975 3976 3977
		return FDC_82072A;	/* 82072A as found on Sparcs. */
	}

	output_byte(FD_UNLOCK);
	r = result();
	if ((r == 1) && (reply_buffer[0] == 0x80)) {
3978
		pr_info("FDC %d is a pre-1991 82077\n", fdc);
3979
		return FDC_82077_ORIG;	/* Pre-1991 82077, doesn't know
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3980 3981 3982
					 * LOCK/UNLOCK */
	}
	if ((r != 1) || (reply_buffer[0] != 0x00)) {
3983 3984
		pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
			fdc, r);
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3985 3986 3987 3988 3989
		return FDC_UNKNOWN;
	}
	output_byte(FD_PARTID);
	r = result();
	if (r != 1) {
3990 3991
		pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n",
			fdc, r);
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3992 3993 3994
		return FDC_UNKNOWN;
	}
	if (reply_buffer[0] == 0x80) {
3995
		pr_info("FDC %d is a post-1991 82077\n", fdc);
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		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 */
4001
		pr_info("FDC %d is an 82078.\n", fdc);
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4002 4003
		return FDC_82078;
	case 0x1:
4004
		pr_info("FDC %d is a 44pin 82078\n", fdc);
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4005 4006
		return FDC_82078;
	case 0x2:
4007
		pr_info("FDC %d is a S82078B\n", fdc);
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4008 4009
		return FDC_S82078B;
	case 0x3:
4010
		pr_info("FDC %d is a National Semiconductor PC87306\n", fdc);
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4011 4012
		return FDC_87306;
	default:
4013 4014
		pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
			fdc, reply_buffer[0] >> 5);
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		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)
4126 4127 4128
					config_params[i].fn(ints, param,
							    config_params[i].
							    param2);
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4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141
				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++)
4142 4143
			pr_cont(" %s", config_params[i].name);
		pr_cont("\n");
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4144 4145
	} else
		DPRINT("botched floppy option\n");
4146
	DPRINT("Read Documentation/blockdev/floppy.txt\n");
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4147 4148 4149 4150 4151
	return 0;
}

static int have_no_fdc = -ENODEV;

4152 4153
static ssize_t floppy_cmos_show(struct device *dev,
				struct device_attribute *attr, char *buf)
4154
{
4155
	struct platform_device *p = to_platform_device(dev);
4156
	int drive;
4157

4158 4159
	drive = p->id;
	return sprintf(buf, "%X\n", UDP->cmos);
4160
}
4161 4162

DEVICE_ATTR(cmos, S_IRUGO, floppy_cmos_show, NULL);
4163

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4164 4165 4166 4167
static void floppy_device_release(struct device *dev)
{
}

F
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4168
static int floppy_resume(struct device *dev)
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4169 4170 4171 4172 4173 4174 4175 4176 4177 4178
{
	int fdc;

	for (fdc = 0; fdc < N_FDC; fdc++)
		if (FDCS->address != -1)
			user_reset_fdc(-1, FD_RESET_ALWAYS, 0);

	return 0;
}

4179
static const struct dev_pm_ops floppy_pm_ops = {
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Ondrej Zary 已提交
4180
	.resume = floppy_resume,
F
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4181 4182 4183 4184
	.restore = floppy_resume,
};

static struct platform_driver floppy_driver = {
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4185
	.driver = {
4186 4187
		   .name = "floppy",
		   .pm = &floppy_pm_ops,
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4188 4189 4190
	},
};

4191
static struct platform_device floppy_device[N_DRIVE];
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4192 4193 4194 4195 4196 4197 4198 4199

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;
4200
	if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type))
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4201 4202 4203 4204 4205 4206 4207 4208 4209 4210
		return NULL;
	*part = 0;
	return get_disk(disks[drive]);
}

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

4211
#if defined(CONFIG_PPC)
4212 4213 4214 4215
	if (check_legacy_ioport(FDC1))
		return -ENODEV;
#endif

L
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4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236
	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)
4237
		goto out_put_disk;
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4238

O
Ondrej Zary 已提交
4239 4240 4241 4242
	err = platform_driver_register(&floppy_driver);
	if (err)
		goto out_unreg_blkdev;

L
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4243 4244 4245
	floppy_queue = blk_init_queue(do_fd_request, &floppy_lock);
	if (!floppy_queue) {
		err = -ENOMEM;
O
Ondrej Zary 已提交
4246
		goto out_unreg_driver;
L
Linus Torvalds 已提交
4247
	}
4248
	blk_queue_max_hw_sectors(floppy_queue, 64);
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4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263

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

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

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

	for (i = 0; i < N_FDC; i++) {
		fdc = i;
4264
		memset(FDCS, 0, sizeof(*FDCS));
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4265 4266 4267
		FDCS->dtr = -1;
		FDCS->dor = 0x4;
#if defined(__sparc__) || defined(__mc68000__)
4268
	/*sparcs/sun3x don't have a DOR reset which we can fall back on to */
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4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296
#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++) {
4297 4298
		memset(UDRS, 0, sizeof(*UDRS));
		memset(UDRWE, 0, sizeof(*UDRWE));
4299 4300 4301
		set_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
		set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
		set_bit(FD_VERIFY_BIT, &UDRS->flags);
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4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322
		UDRS->fd_device = -1;
		floppy_track_buffer = NULL;
		max_buffer_sectors = 0;
	}
	/*
	 * Small 10 msec delay to let through any interrupt that
	 * initialization might have triggered, to not
	 * confuse detection:
	 */
	msleep(10);

	for (i = 0; i < N_FDC; i++) {
		fdc = i;
		FDCS->driver_version = FD_DRIVER_VERSION;
		for (unit = 0; unit < 4; unit++)
			FDCS->track[unit] = 0;
		if (FDCS->address == -1)
			continue;
		FDCS->rawcmd = 2;
		if (user_reset_fdc(-1, FD_RESET_ALWAYS, 0)) {
			/* free ioports reserved by floppy_grab_irq_and_dma() */
4323
			floppy_release_regions(fdc);
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4324 4325 4326 4327 4328 4329 4330 4331
			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() */
4332
			floppy_release_regions(fdc);
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4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360
			FDCS->address = -1;
			continue;
		}
		if (can_use_virtual_dma == 2 && FDCS->version < FDC_82072A)
			can_use_virtual_dma = 0;

		have_no_fdc = 0;
		/* Not all FDCs seem to be able to handle the version command
		 * properly, so force a reset for the standard FDC clones,
		 * to avoid interrupt garbage.
		 */
		user_reset_fdc(-1, FD_RESET_ALWAYS, 0);
	}
	fdc = 0;
	del_timer(&fd_timeout);
	current_drive = 0;
	initialising = 0;
	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;
4361 4362 4363 4364 4365 4366 4367 4368 4369

		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;

4370 4371
		err = device_create_file(&floppy_device[drive].dev,
					 &dev_attr_cmos);
4372 4373 4374
		if (err)
			goto out_unreg_platform_dev;

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4375 4376 4377 4378
		/* to be cleaned up... */
		disks[drive]->private_data = (void *)(long)drive;
		disks[drive]->queue = floppy_queue;
		disks[drive]->flags |= GENHD_FL_REMOVABLE;
4379
		disks[drive]->driverfs_dev = &floppy_device[drive].dev;
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4380 4381 4382 4383 4384
		add_disk(disks[drive]);
	}

	return 0;

4385 4386
out_unreg_platform_dev:
	platform_device_unregister(&floppy_device[drive]);
L
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4387 4388 4389 4390 4391 4392 4393
out_flush_work:
	flush_scheduled_work();
	if (usage_count)
		floppy_release_irq_and_dma();
out_unreg_region:
	blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
	blk_cleanup_queue(floppy_queue);
O
Ondrej Zary 已提交
4394 4395
out_unreg_driver:
	platform_driver_unregister(&floppy_driver);
L
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4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407
out_unreg_blkdev:
	unregister_blkdev(FLOPPY_MAJOR, "fd");
out_put_disk:
	while (dr--) {
		del_timer(&motor_off_timer[dr]);
		put_disk(disks[dr]);
	}
	return err;
}

static DEFINE_SPINLOCK(floppy_usage_lock);

4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433 4434
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++) {
4435 4436 4437 4438
		if (!request_region(FDCS->address + p->offset,
				    p->size, "floppy")) {
			DPRINT("Floppy io-port 0x%04lx in use\n",
			       FDCS->address + p->offset);
4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450
			floppy_release_allocated_regions(fdc, p);
			return -EBUSY;
		}
	}
	return 0;
}

static void floppy_release_regions(int fdc)
{
	floppy_release_allocated_regions(fdc, ARRAY_END(io_regions));
}

L
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4451 4452 4453 4454 4455 4456 4457 4458 4459 4460
static int floppy_grab_irq_and_dma(void)
{
	unsigned long flags;

	spin_lock_irqsave(&floppy_usage_lock, flags);
	if (usage_count++) {
		spin_unlock_irqrestore(&floppy_usage_lock, flags);
		return 0;
	}
	spin_unlock_irqrestore(&floppy_usage_lock, flags);
4461 4462 4463 4464 4465 4466 4467

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

L
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4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478
	if (fd_request_irq()) {
		DPRINT("Unable to grab IRQ%d for the floppy driver\n",
		       FLOPPY_IRQ);
		spin_lock_irqsave(&floppy_usage_lock, flags);
		usage_count--;
		spin_unlock_irqrestore(&floppy_usage_lock, flags);
		return -1;
	}
	if (fd_request_dma()) {
		DPRINT("Unable to grab DMA%d for the floppy driver\n",
		       FLOPPY_DMA);
4479 4480 4481 4482 4483 4484 4485 4486 4487
		if (can_use_virtual_dma & 2)
			use_virtual_dma = can_use_virtual_dma = 1;
		if (!(can_use_virtual_dma & 1)) {
			fd_free_irq();
			spin_lock_irqsave(&floppy_usage_lock, flags);
			usage_count--;
			spin_unlock_irqrestore(&floppy_usage_lock, flags);
			return -1;
		}
L
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4488 4489 4490 4491
	}

	for (fdc = 0; fdc < N_FDC; fdc++) {
		if (FDCS->address != -1) {
4492 4493
			if (floppy_request_regions(fdc))
				goto cleanup;
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4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508
		}
	}
	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);
	/*
4509 4510
	 * The driver will try and free resources and relies on us
	 * to know if they were allocated or not.
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	 */
	fdc = 0;
	irqdma_allocated = 1;
	return 0;
4515
cleanup:
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	fd_free_irq();
	fd_free_dma();
4518 4519
	while (--fdc >= 0)
		floppy_release_regions(fdc);
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	spin_lock_irqsave(&floppy_usage_lock, flags);
	usage_count--;
	spin_unlock_irqrestore(&floppy_usage_lock, flags);
	return -1;
}

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

	spin_lock_irqsave(&floppy_usage_lock, flags);
	if (--usage_count) {
		spin_unlock_irqrestore(&floppy_usage_lock, flags);
		return;
	}
	spin_unlock_irqrestore(&floppy_usage_lock, flags);
	if (irqdma_allocated) {
		fd_disable_dma();
		fd_free_dma();
4547
		fd_free_irq();
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		irqdma_allocated = 0;
	}
	set_dor(0, ~0, 8);
#if N_FDC > 1
	set_dor(1, ~8, 0);
#endif
	floppy_enable_hlt();

	if (floppy_track_buffer && max_buffer_sectors) {
		tmpsize = max_buffer_sectors * 1024;
		tmpaddr = (unsigned long)floppy_track_buffer;
		floppy_track_buffer = NULL;
		max_buffer_sectors = 0;
		buffer_min = buffer_max = -1;
		fd_dma_mem_free(tmpaddr, tmpsize);
	}
#ifdef FLOPPY_SANITY_CHECK
#ifndef __sparc__
	for (drive = 0; drive < N_FDC * 4; drive++)
		if (timer_pending(motor_off_timer + drive))
4568
			pr_info("motor off timer %d still active\n", drive);
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#endif

	if (timer_pending(&fd_timeout))
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		pr_info("floppy timer still active:%s\n", timeout_message);
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	if (timer_pending(&fd_timer))
4574
		pr_info("auxiliary floppy timer still active\n");
4575
	if (work_pending(&floppy_work))
4576
		pr_info("work still pending\n");
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#endif
	old_fdc = fdc;
	for (fdc = 0; fdc < N_FDC; fdc++)
4580 4581
		if (FDCS->address != -1)
			floppy_release_regions(fdc);
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	fdc = old_fdc;
}

#ifdef MODULE

static char *floppy;

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

	while (*cfg) {
4594 4595 4596
		ptr = cfg;
		while (*cfg && *cfg != ' ' && *cfg != '\t')
			cfg++;
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		if (*cfg) {
			*cfg = '\0';
			cfg++;
		}
		if (*ptr)
			floppy_setup(ptr);
	}
}

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static int __init floppy_module_init(void)
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{
	if (floppy)
		parse_floppy_cfg_string(floppy);
	return floppy_init();
}
4612
module_init(floppy_module_init);
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static void __exit floppy_module_exit(void)
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{
	int drive;

	blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
	unregister_blkdev(FLOPPY_MAJOR, "fd");
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	platform_driver_unregister(&floppy_driver);
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	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]);
4628 4629
			device_remove_file(&floppy_device[drive].dev, &dev_attr_cmos);
			platform_device_unregister(&floppy_device[drive]);
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		}
		put_disk(disks[drive]);
	}

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

	if (usage_count)
		floppy_release_irq_and_dma();

	/* eject disk, if any */
	fd_eject(0);
}
4644

4645
module_exit(floppy_module_exit);
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module_param(floppy, charp, 0);
module_param(FLOPPY_IRQ, int, 0);
module_param(FLOPPY_DMA, int, 0);
MODULE_AUTHOR("Alain L. Knaff");
MODULE_SUPPORTED_DEVICE("fd");
MODULE_LICENSE("GPL");

4654 4655
/* This doesn't actually get used other than for module information */
static const struct pnp_device_id floppy_pnpids[] = {
4656 4657
	{"PNP0700", 0},
	{}
4658
};
4659

4660 4661
MODULE_DEVICE_TABLE(pnp, floppy_pnpids);

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#else

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

MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);