floppy.c 117.0 KB
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/*
 *  linux/drivers/block/floppy.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *  Copyright (C) 1993, 1994  Alain Knaff
 *  Copyright (C) 1998 Alan Cox
 */
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/*
 * 02.12.91 - Changed to static variables to indicate need for reset
 * and recalibrate. This makes some things easier (output_byte reset
 * checking etc), and means less interrupt jumping in case of errors,
 * so the code is hopefully easier to understand.
 */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

#undef  FLOPPY_SILENT_DCL_CLEAR

#define REALLY_SLOW_IO

#define DEBUGT 2

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

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

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/* do print messages for unexpected interrupts */
static int print_unex = 1;
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#define FDPATCHES
#include <linux/fdreg.h>
#include <linux/fd.h>
#include <linux/hdreg.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/bio.h>
#include <linux/string.h>
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#include <linux/jiffies.h>
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#include <linux/fcntl.h>
#include <linux/delay.h>
#include <linux/mc146818rtc.h>	/* CMOS defines */
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/mod_devicetable.h>
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#include <linux/mutex.h>
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#include <linux/io.h>
#include <linux/uaccess.h>
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#include <linux/async.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.
 */
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static DEFINE_MUTEX(floppy_mutex);
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static int slow_floppy;

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

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

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

static DEFINE_SPINLOCK(floppy_lock);

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

#define K_64	0x10000		/* 64KB */

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

static int allowed_drive_mask = 0x33;

#include <asm/floppy.h>

static int irqdma_allocated;

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

static struct request *current_req;
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static void do_fd_request(struct request_queue *q);
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static int set_next_request(void);
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#ifndef fd_get_dma_residue
#define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA)
#endif

/* Dma Memory related stuff */

#ifndef fd_dma_mem_free
#define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
#endif

#ifndef fd_dma_mem_alloc
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#define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL, get_order(size))
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#endif

static inline void fallback_on_nodma_alloc(char **addr, size_t l)
{
#ifdef FLOPPY_CAN_FALLBACK_ON_NODMA
	if (*addr)
		return;		/* we have the memory */
	if (can_use_virtual_dma != 2)
		return;		/* no fallback allowed */
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	pr_info("DMA memory shortage. Temporarily falling back on virtual DMA\n");
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	*addr = (char *)nodma_mem_alloc(l);
#else
	return;
#endif
}

/* End dma memory related stuff */

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

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#define DP	(&drive_params[current_drive])
#define DRS	(&drive_state[current_drive])
#define DRWE	(&write_errors[current_drive])
#define FDCS	(&fdc_state[fdc])
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#define UDP	(&drive_params[drive])
#define UDRS	(&drive_state[drive])
#define UDRWE	(&write_errors[drive])
#define UFDCS	(&fdc_state[FDC(drive)])
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#define PH_HEAD(floppy, head) (((((floppy)->stretch & 2) >> 1) ^ head) << 2)
#define STRETCH(floppy)	((floppy)->stretch & FD_STRETCH)

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

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

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

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

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

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

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

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

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

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

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

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

/* 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 const 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);
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static void floppy_shutdown(struct work_struct *);
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static int floppy_request_regions(int);
static void floppy_release_regions(int);
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static int floppy_grab_irq_and_dma(void);
static void floppy_release_irq_and_dma(void);

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

/*
 * These are global variables, as that's the easiest way to give
 * information to interrupts. They are the data used for the current
 * request.
 */
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#define NO_TRACK	-1
#define NEED_1_RECAL	-2
#define NEED_2_RECAL	-3
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static atomic_t usage_count = ATOMIC_INIT(0);
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/* buffer related variables */
static int buffer_track = -1;
static int buffer_drive = -1;
static int buffer_min = -1;
static int buffer_max = -1;

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

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static struct workqueue_struct *floppy_wq;

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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 */

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static inline bool drive_no_geom(int drive)
{
	return !current_type[drive] && !ITYPE(UDRS->fd_device);
}

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

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

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

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


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static DECLARE_DELAYED_WORK(fd_timeout, floppy_shutdown);
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static const char *timeout_message;

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

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static void (*do_floppy)(void) = NULL;
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#define OLOGSIZE 20

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

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

static int output_log_pos;

#define current_reqD -1
#define MAXTIMEOUT -2

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static void __reschedule_timeout(int drive, const char *message)
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{
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	unsigned long delay;

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	if (drive == current_reqD)
		drive = current_drive;
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	if (drive < 0 || drive >= N_DRIVE) {
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		delay = 20UL * HZ;
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		drive = 0;
	} else
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		delay = UDP->timeout;

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	mod_delayed_work(floppy_wq, &fd_timeout, delay);
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	if (UDP->flags & FD_DEBUG)
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		DPRINT("reschedule timeout %s\n", message);
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	timeout_message = message;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

/* locks the driver */
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static int lock_fdc(int drive, bool interruptible)
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{
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	if (WARN(atomic_read(&usage_count) == 0,
		 "Trying to lock fdc while usage count=0\n"))
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		return -1;

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	if (wait_event_interruptible(fdc_wait, !test_and_set_bit(0, &fdc_busy)))
		return -EINTR;
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	command_status = FD_COMMAND_NONE;

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

/* unlocks the driver */
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static void unlock_fdc(void)
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{
	if (!test_bit(0, &fdc_busy))
		DPRINT("FDC access conflict!\n");

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	raw_cmd = NULL;
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	command_status = FD_COMMAND_NONE;
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	cancel_delayed_work(&fd_timeout);
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	do_floppy = NULL;
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	cont = NULL;
	clear_bit(0, &fdc_busy);
	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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	WARN_ON(work_pending(&floppy_work));

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	PREPARE_WORK(&floppy_work, (work_func_t)handler);
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	queue_work(floppy_wq, &floppy_work);
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}

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static DECLARE_DELAYED_WORK(fd_timer, NULL);
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static void cancel_activity(void)
{
	do_floppy = NULL;
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	cancel_delayed_work_sync(&fd_timer);
	cancel_work_sync(&floppy_work);
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}

/* this function makes sure that the disk stays in the drive during the
 * transfer */
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static void fd_watchdog(struct work_struct *arg)
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{
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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 {
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		cancel_delayed_work(&fd_timer);
		PREPARE_DELAYED_WORK(&fd_timer, fd_watchdog);
		queue_delayed_work(floppy_wq, &fd_timer, HZ / 10);
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	}
}

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

/* waits for a delay (spinup or select) to pass */
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static int fd_wait_for_completion(unsigned long expires, work_func_t function)
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{
	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, expires)) {
		cancel_delayed_work(&fd_timer);
		PREPARE_DELAYED_WORK(&fd_timer, function);
		queue_delayed_work(floppy_wq, &fd_timer, expires - jiffies);
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		return 1;
	}
	return 0;
}

static void setup_DMA(void)
{
	unsigned long f;

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

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		pr_info("zero dma transfer size:");
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		for (i = 0; i < raw_cmd->cmd_count; i++)
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			pr_cont("%x,", raw_cmd->cmd[i]);
		pr_cont("\n");
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		cont->done(0);
		FDCS->reset = 1;
		return;
	}
	if (((unsigned long)raw_cmd->kernel_data) % 512) {
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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;
	}
	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
}

static void show_floppy(void);

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

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

/* sends a command byte to the fdc */
static int output_byte(char byte)
{
1098
	int status = wait_til_ready();
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	if (status < 0)
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		return -1;
1102 1103

	if (is_ready_state(status)) {
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		fd_outb(byte, FD_DATA);
		output_log[output_log_pos].data = byte;
		output_log[output_log_pos].status = status;
		output_log[output_log_pos].jiffies = jiffies;
		output_log_pos = (output_log_pos + 1) % OLOGSIZE;
		return 0;
	}
	FDCS->reset = 1;
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	if (initialized) {
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		DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
		       byte, fdc, status);
		show_floppy();
	}
	return -1;
}

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

#define MORE_OUTPUT -2
/* does the fdc need more output? */
static int need_more_output(void)
{
1154
	int status = wait_til_ready();
1155

1156
	if (status < 0)
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		return -1;
1158 1159

	if (is_ready_state(status))
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		return MORE_OUTPUT;
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	return result();
}

/* Set perpendicular mode as required, based on data rate, if supported.
 * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
 */
1168
static void perpendicular_mode(void)
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{
	unsigned char perp_mode;

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

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

static int fifo_depth = 0xa;
static int no_fifo;

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

#define NOMINAL_DTR 500

/* Issue a "SPECIFY" command to set the step rate time, head unload time,
 * head load time, and DMA disable flag to values needed by floppy.
 *
 * The value "dtr" is the data transfer rate in Kbps.  It is needed
 * to account for the data rate-based scaling done by the 82072 and 82077
 * FDC types.  This parameter is ignored for other types of FDCs (i.e.
 * 8272a).
 *
 * Note that changing the data transfer rate has a (probably deleterious)
 * effect on the parameters subject to scaling for 82072/82077 FDCs, so
 * fdc_specify is called again after each data transfer rate
 * change.
 *
 * srt: 1000 to 16000 in microseconds
 * hut: 16 to 240 milliseconds
 * hlt: 2 to 254 milliseconds
 *
 * These values are rounded up to the next highest available delay time.
 */
static void fdc_specify(void)
{
1244 1245 1246 1247 1248
	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);
1288
	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,
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				      (work_func_t)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) {
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		DPRINT("-- FDC reply error\n");
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		FDCS->reset = 1;
		return 1;
	}

	/* check IC to find cause of interrupt */
	switch (ST0 & ST0_INTR) {
	case 0x40:		/* error occurred during command execution */
		if (ST1 & ST1_EOC)
			return 0;	/* occurs with pseudo-DMA */
		bad = 1;
		if (ST1 & ST1_WP) {
			DPRINT("Drive is write protected\n");
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			clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
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			cont->done(0);
			bad = 2;
		} else if (ST1 & ST1_ND) {
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			set_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
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		} else if (ST1 & ST1_OR) {
			if (DP->flags & FTD_MSG)
				DPRINT("Over/Underrun - retrying\n");
			bad = 0;
		} else if (*errors >= DP->max_errors.reporting) {
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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)
{
1438 1439 1440 1441
	int i;
	int r;
	int flags;
	int dflags;
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	unsigned long ready_date;
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	work_func_t function;
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	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.
		 */
1455
		if (time_after(ready_date, jiffies + DP->select_delay)) {
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			ready_date -= DP->select_delay;
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			function = (work_func_t)floppy_start;
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		} else
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			function = (work_func_t)setup_rw_floppy;
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		/* wait until the floppy is spinning fast enough */
		if (fd_wait_for_completion(ready_date, function))
			return;
	}
	dflags = DRS->flags;

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

	if (flags & FD_RAW_INTR)
		do_floppy = main_command_interrupt;

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

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	debugt(__func__, "rw_command");
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	if (r) {
		cont->error();
		reset_fdc();
		return;
	}

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

static int blind_seek;

/*
 * This is the routine called after every seek (or recalibrate) interrupt
 * from the floppy controller.
 */
static void seek_interrupt(void)
{
1500
	debugt(__func__, "");
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	if (inr != 2 || (ST0 & 0xF8) != 0x20) {
		DPRINT("seek failed\n");
		DRS->track = NEED_2_RECAL;
		cont->error();
		cont->redo();
		return;
	}
	if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) {
1509 1510 1511
		debug_dcl(DP->flags,
			  "clearing NEWCHANGE flag because of effective seek\n");
		debug_dcl(DP->flags, "jiffies=%lu\n", jiffies);
1512 1513
		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)
{
1522 1523
	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;
		}
1530 1531
		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;

1548
	debug_dcl(DP->flags, "calling disk change from %s\n", __func__);
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	if (!test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
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	    disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
		/* the media changed flag should be cleared after the seek.
		 * If it isn't, this means that there is really no disk in
		 * the drive.
		 */
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		set_bit(FD_DISK_CHANGED_BIT, &DRS->flags);
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		cont->done(0);
		cont->redo();
		return;
	}
	if (DRS->track <= NEED_1_RECAL) {
		recalibrate_floppy();
		return;
1564
	} 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));
1593 1594 1595 1596
	if (output_byte(track) < 0) {
		reset_fdc();
		return;
	}
1597
	debugt(__func__, "");
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}

static void recal_interrupt(void)
{
1602
	debugt(__func__, "");
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	if (inr != 2)
		FDCS->reset = 1;
	else if (ST0 & ST0_ECE) {
		switch (DRS->track) {
		case NEED_1_RECAL:
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			debugt(__func__, "need 1 recal");
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			/* after a second recalibrate, we still haven't
			 * reached track 0. Probably no drive. Raise an
			 * error, as failing immediately might upset
			 * computers possessed by the Devil :-) */
			cont->error();
			cont->redo();
			return;
		case NEED_2_RECAL:
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			debugt(__func__, "need 2 recal");
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			/* If we already did a recalibrate,
			 * and we are not at track 0, this
			 * means we have moved. (The only way
			 * not to move at recalibration is to
			 * be already at track 0.) Clear the
			 * new change flag */
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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:
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			debugt(__func__, "default");
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			/* Recalibrate moves the head by at
			 * most 80 steps. If after one
			 * recalibrate we don't have reached
			 * track 0, this might mean that we
			 * started beyond track 80.  Try
			 * again.  */
			DRS->track = NEED_1_RECAL;
			break;
		}
	} else
		DRS->track = ST1;
	floppy_ready();
}

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

	DPRINT("%s ", message);
	if (inr >= 0)
		for (i = 0; i < inr; i++)
1653 1654
			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;
1662
	void (*handler)(void) = do_floppy;
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	lasthandler = handler;
	interruptjiffies = jiffies;

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

	do_floppy = NULL;
	if (fdc >= N_FDC || FDCS->address == -1) {
		/* we don't even know which FDC is the culprit */
1674 1675
		pr_info("DOR0=%x\n", fdc_state[0].dor);
		pr_info("floppy interrupt on bizarre fdc %d\n", fdc);
1676
		pr_info("handler=%pf\n", handler);
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		is_alive(__func__, "bizarre fdc");
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		return IRQ_NONE;
	}

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

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	do_print = !handler && print_unex && initialized;
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	inr = result();
	if (do_print)
		print_result("unexpected interrupt", inr);
	if (inr == 0) {
		int max_sensei = 4;
		do {
			output_byte(FD_SENSEI);
			inr = result();
			if (do_print)
				print_result("sensei", inr);
			max_sensei--;
1704 1705
		} while ((ST0 & 0x83) != UNIT(current_drive) &&
			 inr == 2 && max_sensei);
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	}
	if (!handler) {
		FDCS->reset = 1;
		return IRQ_NONE;
	}
	schedule_bh(handler);
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	is_alive(__func__, "normal interrupt end");
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	/* FIXME! Was it really for us? */
	return IRQ_HANDLED;
}

static void recalibrate_floppy(void)
{
1720
	debugt(__func__, "");
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	do_floppy = recal_interrupt;
	output_byte(FD_RECALIBRATE);
1723
	if (output_byte(UNIT(current_drive)) < 0)
1724
		reset_fdc();
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}

/*
 * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
 */
static void reset_interrupt(void)
{
1732
	debugt(__func__, "");
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	result();		/* get the status ready for set_fdc */
	if (FDCS->reset) {
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		pr_info("reset set in interrupt, calling %pf\n", cont->error);
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		cont->error();	/* a reset just after a reset. BAD! */
	}
	cont->redo();
}

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

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

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

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

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

static void show_floppy(void)
{
	int i;

1773 1774 1775
	pr_info("\n");
	pr_info("floppy driver state\n");
	pr_info("-------------------\n");
1776
	pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%pf\n",
1777 1778
		jiffies, interruptjiffies, jiffies - interruptjiffies,
		lasthandler);
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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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	pr_info("status=%x\n", fd_inb(FD_STATUS));
	pr_info("fdc_busy=%lu\n", fdc_busy);
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	if (do_floppy)
1795
		pr_info("do_floppy=%pf\n", do_floppy);
1796
	if (work_pending(&floppy_work))
1797
		pr_info("floppy_work.func=%pf\n", floppy_work.func);
1798 1799 1800 1801 1802 1803 1804 1805 1806
	if (delayed_work_pending(&fd_timer))
		pr_info("delayed work.function=%p expires=%ld\n",
		       fd_timer.work.func,
		       fd_timer.timer.expires - jiffies);
	if (delayed_work_pending(&fd_timeout))
		pr_info("timer_function=%p expires=%ld\n",
		       fd_timeout.work.func,
		       fd_timeout.timer.expires - jiffies);

1807 1808 1809 1810
	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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}

1813
static void floppy_shutdown(struct work_struct *arg)
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{
	unsigned long flags;

1817
	if (initialized)
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		show_floppy();
	cancel_activity();

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

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

1827
	if (initialized)
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		DPRINT("floppy timeout called\n");
	FDCS->reset = 1;
	if (cont) {
		cont->done(0);
		cont->redo();	/* this will recall reset when needed */
	} else {
1834
		pr_info("no cont in shutdown!\n");
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		process_fd_request();
	}
1837
	is_alive(__func__, "");
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}

/* start motor, check media-changed condition and write protection */
1841
static int start_motor(void (*function)(void))
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{
1843 1844
	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. */
1865
	return fd_wait_for_completion(DRS->select_date + DP->select_delay,
1866
				      (work_func_t)function);
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}

static void floppy_ready(void)
{
1871 1872 1873 1874
	if (FDCS->reset) {
		reset_fdc();
		return;
	}
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	if (start_motor(floppy_ready))
		return;
	if (fdc_dtr())
		return;

1880
	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)
1883 1884
		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)
{
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	reschedule_timeout(current_reqD, "floppy start");
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	scandrives();
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	debug_dcl(DP->flags, "setting NEWCHANGE in floppy_start\n");
1912
	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)
{
1932
	reschedule_timeout(MAXTIMEOUT, "do wakeup");
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	cont = NULL;
	command_status += 2;
	wake_up(&command_done);
}

1938
static const struct cont_t wakeup_cont = {
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	.interrupt	= empty,
	.redo		= do_wakeup,
	.error		= empty,
1942
	.done		= (done_f)empty
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};

1945
static const struct cont_t intr_cont = {
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	.interrupt	= empty,
	.redo		= process_fd_request,
	.error		= empty,
1949
	.done		= (done_f)empty
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};

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

	schedule_bh(handler);

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	if (interruptible)
		wait_event_interruptible(command_done, command_status >= 2);
	else
		wait_event(command_done, command_status >= 2);
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	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);
2047

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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();
}

2071
#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)
{
2076 2077 2078 2079 2080
	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;

2088 2089
	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();
2148
	debugt(__func__, "queue format request");
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}

2151
static const struct cont_t format_cont = {
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	.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;

2162
	if (lock_fdc(drive, true))
2163 2164
		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;
2179
	ret = wait_til_done(redo_format, true);
2180 2181
	if (ret == -EINTR)
		return -EINTR;
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	process_fd_request();
	return ret;
}

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

2191
static void floppy_end_request(struct request *req, int error)
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{
	unsigned int nr_sectors = current_count_sectors;
2194
	unsigned int drive = (unsigned long)req->rq_disk->private_data;
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	/* current_count_sectors can be zero if transfer failed */
2197
	if (error)
2198
		nr_sectors = blk_rq_cur_sectors(req);
2199
	if (__blk_end_request(req, error, nr_sectors << 9))
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		return;

	/* We're done with the request */
2203
	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 *req = current_req;
2212
	struct request_queue *q;
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	unsigned long flags;
	int block;
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	char msg[sizeof("request done ") + sizeof(int) * 3];
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	probing = 0;
2218 2219
	snprintf(msg, sizeof(msg), "request done %d", uptodate);
	reschedule_timeout(MAXTIMEOUT, msg);
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	if (!req) {
2222
		pr_info("floppy.c: no request in request_done\n");
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		return;
	}

2226 2227
	q = req->q;

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

		/* unlock chained buffers */
		spin_lock_irqsave(q->queue_lock, flags);
2238
		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) {
2245
				DRWE->first_error_sector = blk_rq_pos(req);
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				DRWE->first_error_generation = DRS->generation;
			}
2248
			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);
2252
		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)
{
2260 2261 2262 2263
	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;
2276
	ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
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	if (ST1 & ST1_EOC)
		eoc = 1;
	else
		eoc = 0;

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

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

	if (nr_sectors / ssize >
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	    DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
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		DPRINT("long rw: %x instead of %lx\n",
		       nr_sectors, current_count_sectors);
2296 2297 2298 2299 2300 2301 2302
		pr_info("rs=%d s=%d\n", R_SECTOR, SECTOR);
		pr_info("rh=%d h=%d\n", R_HEAD, HEAD);
		pr_info("rt=%d t=%d\n", R_TRACK, TRACK);
		pr_info("heads=%d eoc=%d\n", heads, eoc);
		pr_info("spt=%d st=%d ss=%d\n",
			SECT_PER_TRACK, fsector_t, ssize);
		pr_info("in_sector_offset=%d\n", in_sector_offset);
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	}

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

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

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

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

/* Compute maximal contiguous buffer size. */
static int buffer_chain_size(void)
{
	struct bio_vec *bv;
2355 2356
	int size;
	struct req_iterator iter;
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	char *base;

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

2362 2363 2364
	rq_for_each_segment(bv, current_req, iter) {
		if (page_address(bv->bv_page) + bv->bv_offset != base + size)
			break;
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2366
		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;
2393 2394
	char *buffer;
	char *dma_buffer;
2395 2396
	int size;
	struct req_iterator iter;
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	max_sector = transfer_size(ssize,
				   min(max_sector, max_sector_2),
2400
				   blk_rq_sectors(current_req));
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	if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2403
	    buffer_max > fsector_t + blk_rq_sectors(current_req))
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		current_count_sectors = min_t(int, buffer_max - fsector_t,
2405
					      blk_rq_sectors(current_req));
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	remaining = current_count_sectors << 9;
2408
	if (remaining > blk_rq_bytes(current_req) && CT(COMMAND) == FD_WRITE) {
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		DPRINT("in copy buffer\n");
2410 2411 2412 2413 2414 2415 2416 2417
		pr_info("current_count_sectors=%ld\n", current_count_sectors);
		pr_info("remaining=%d\n", remaining >> 9);
		pr_info("current_req->nr_sectors=%u\n",
			blk_rq_sectors(current_req));
		pr_info("current_req->current_nr_sectors=%u\n",
			blk_rq_cur_sectors(current_req));
		pr_info("max_sector=%d\n", max_sector);
		pr_info("ssize=%d\n", ssize);
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	}

	buffer_max = max(max_sector, buffer_max);

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

2424
	size = blk_rq_cur_bytes(current_req);
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2426 2427 2428
	rq_for_each_segment(bv, current_req, iter) {
		if (!remaining)
			break;
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2429

2430 2431
		size = bv->bv_len;
		SUPBOUND(size, remaining);
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2433 2434 2435 2436 2437
		buffer = page_address(bv->bv_page) + bv->bv_offset;
		if (dma_buffer + size >
		    floppy_track_buffer + (max_buffer_sectors << 10) ||
		    dma_buffer < floppy_track_buffer) {
			DPRINT("buffer overrun in copy buffer %d\n",
2438 2439 2440 2441 2442
			       (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)
2444
				pr_info("read\n");
2445
			if (CT(COMMAND) == FD_WRITE)
2446
				pr_info("write\n");
2447
			break;
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		}
2449 2450
		if (((unsigned long)buffer) % 512)
			DPRINT("%p buffer not aligned\n", buffer);
2451

2452 2453 2454 2455 2456 2457 2458
		if (CT(COMMAND) == FD_READ)
			memcpy(buffer, dma_buffer, size);
		else
			memcpy(dma_buffer, buffer, size);

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

/* work around a bug in pseudo DMA
 * (on some FDCs) pseudo DMA does not stop when the CPU stops
 * sending data.  Hence we need a different way to signal the
 * transfer length:  We use SECT_PER_TRACK.  Unfortunately, this
 * does not work with MT, hence we can only transfer one head at
 * a time
 */
static void virtualdmabug_workaround(void)
{
2476 2477
	int hard_sectors;
	int end_sector;
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	if (CT(COMMAND) == FD_WRITE) {
		COMMAND &= ~0x80;	/* switch off multiple track mode */

		hard_sectors = raw_cmd->length >> (7 + SIZECODE);
		end_sector = SECTOR + hard_sectors - 1;
		if (end_sector > SECT_PER_TRACK) {
2485 2486
			pr_info("too many sectors %d > %d\n",
				end_sector, SECT_PER_TRACK);
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			return;
		}
2489 2490 2491
		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;
2508 2509 2510 2511
	int max_sector;
	int max_size;
	int tracksize;
	int ssize;
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	if (WARN(max_buffer_sectors == 0, "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;
2519
	raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK;
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	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 {
2528
		DPRINT("%s: unknown command\n", __func__);
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		return 0;
	}

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

2534 2535
	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) {
2537
		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;

2545
	if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
2546 2547
	     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,
2556
				  blk_rq_sectors(current_req));
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2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572
			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;
2573
	ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
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	SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
	SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
2576
	    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;
2607
	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;
		}
2616
	} else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
L
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2617
		if (CT(COMMAND) == FD_WRITE) {
2618 2619 2620 2621
			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();
2642 2643
		dma_limit = (MAX_DMA_ADDRESS -
			     ((unsigned long)current_req->buffer)) >> 9;
2644
		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 &&
2661 2662 2663
		     *errors < DP->max_errors.read_track &&
		     ((!probing ||
		       (DP->read_track & (1 << DRS->probed_format)))))) {
2664
			max_size = blk_rq_sectors(current_req);
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2665 2666 2667 2668
		} else {
			raw_cmd->kernel_data = current_req->buffer;
			raw_cmd->length = current_count_sectors << 9;
			if (raw_cmd->length == 0) {
2669
				DPRINT("%s: zero dma transfer attempted\n", __func__);
2670
				DPRINT("indirect=%d direct=%d fsector_t=%d\n",
L
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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 ||
2688
	      (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
L
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2689
	     max_sector > 2 * max_buffer_sectors + buffer_min &&
2690 2691
	     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 +
2697
		((aligned_sector_t - buffer_min) << 9);
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	if (CT(COMMAND) == FD_WRITE) {
		/* copy write buffer to track buffer.
		 * if we get here, we know that the write
		 * is either aligned or the data already in the buffer
		 * (buffer will be overwritten) */
		if (in_sector_offset && buffer_track == -1)
			DPRINT("internal error offset !=0 on write\n");
		buffer_track = raw_cmd->track;
		buffer_drive = current_drive;
		copy_buffer(ssize, max_sector,
			    2 * max_buffer_sectors + buffer_min);
	} else
		transfer_size(ssize, max_sector,
			      2 * max_buffer_sectors + buffer_min -
			      aligned_sector_t);

	/* round up current_count_sectors to get dma xfer size */
	raw_cmd->length = in_sector_offset + current_count_sectors;
	raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
	raw_cmd->length <<= 9;
	if ((raw_cmd->length < current_count_sectors << 9) ||
	    (raw_cmd->kernel_data != current_req->buffer &&
	     CT(COMMAND) == FD_WRITE &&
	     (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
	      aligned_sector_t < buffer_min)) ||
	    raw_cmd->length % (128 << SIZECODE) ||
	    raw_cmd->length <= 0 || current_count_sectors <= 0) {
		DPRINT("fractionary current count b=%lx s=%lx\n",
		       raw_cmd->length, current_count_sectors);
		if (raw_cmd->kernel_data != current_req->buffer)
2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741
			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);
L
Linus Torvalds 已提交
2742 2743 2744 2745 2746 2747 2748 2749 2750 2751
		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");
2752 2753 2754 2755
			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);
L
Linus Torvalds 已提交
2756
			if (CT(COMMAND) == FD_READ)
2757
				pr_info("read\n");
L
Linus Torvalds 已提交
2758
			if (CT(COMMAND) == FD_WRITE)
2759
				pr_info("write\n");
L
Linus Torvalds 已提交
2760 2761
			return 0;
		}
2762
	} else if (raw_cmd->length > blk_rq_bytes(current_req) ||
2763
		   current_count_sectors > blk_rq_sectors(current_req)) {
L
Linus Torvalds 已提交
2764 2765 2766 2767
		DPRINT("buffer overrun in direct transfer\n");
		return 0;
	} else if (raw_cmd->length < current_count_sectors << 9) {
		DPRINT("more sectors than bytes\n");
2768 2769
		pr_info("bytes=%ld\n", raw_cmd->length >> 9);
		pr_info("sectors=%ld\n", current_count_sectors);
L
Linus Torvalds 已提交
2770 2771 2772 2773 2774 2775 2776 2777 2778 2779
	}
	if (raw_cmd->length == 0) {
		DPRINT("zero dma transfer attempted from make_raw_request\n");
		return 0;
	}

	virtualdmabug_workaround();
	return 2;
}

2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801
/*
 * Round-robin between our available drives, doing one request from each
 */
static int set_next_request(void)
{
	struct request_queue *q;
	int old_pos = fdc_queue;

	do {
		q = disks[fdc_queue]->queue;
		if (++fdc_queue == N_DRIVE)
			fdc_queue = 0;
		if (q) {
			current_req = blk_fetch_request(q);
			if (current_req)
				break;
		}
	} while (fdc_queue != old_pos);

	return current_req != NULL;
}

L
Linus Torvalds 已提交
2802 2803 2804 2805 2806 2807 2808 2809 2810
static void redo_fd_request(void)
{
	int drive;
	int tmp;

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

2811 2812
do_request:
	if (!current_req) {
2813 2814 2815 2816 2817 2818
		int pending;

		spin_lock_irq(&floppy_lock);
		pending = set_next_request();
		spin_unlock_irq(&floppy_lock);
		if (!pending) {
2819 2820
			do_floppy = NULL;
			unlock_fdc();
L
Linus Torvalds 已提交
2821 2822
			return;
		}
2823 2824 2825
	}
	drive = (long)current_req->rq_disk->private_data;
	set_fdc(drive);
2826
	reschedule_timeout(current_reqD, "redo fd request");
L
Linus Torvalds 已提交
2827

2828 2829 2830 2831
	set_floppy(drive);
	raw_cmd = &default_raw_cmd;
	raw_cmd->flags = 0;
	if (start_motor(redo_fd_request))
L
Linus Torvalds 已提交
2832
		return;
2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859

	disk_change(current_drive);
	if (test_bit(current_drive, &fake_change) ||
	    test_bit(FD_DISK_CHANGED_BIT, &DRS->flags)) {
		DPRINT("disk absent or changed during operation\n");
		request_done(0);
		goto do_request;
	}
	if (!_floppy) {	/* Autodetection */
		if (!probing) {
			DRS->probed_format = 0;
			if (next_valid_format()) {
				DPRINT("no autodetectable formats\n");
				_floppy = NULL;
				request_done(0);
				goto do_request;
			}
		}
		probing = 1;
		_floppy = floppy_type + DP->autodetect[DRS->probed_format];
	} else
		probing = 0;
	errors = &(current_req->errors);
	tmp = make_raw_rw_request();
	if (tmp < 2) {
		request_done(tmp);
		goto do_request;
L
Linus Torvalds 已提交
2860
	}
2861 2862 2863 2864

	if (test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags))
		twaddle();
	schedule_bh(floppy_start);
2865
	debugt(__func__, "queue fd request");
2866
	return;
L
Linus Torvalds 已提交
2867 2868
}

2869
static const struct cont_t rw_cont = {
L
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2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881
	.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);
}

2882
static void do_fd_request(struct request_queue *q)
L
Linus Torvalds 已提交
2883
{
S
Stephen Hemminger 已提交
2884 2885
	if (WARN(max_buffer_sectors == 0,
		 "VFS: %s called on non-open device\n", __func__))
L
Linus Torvalds 已提交
2886 2887
		return;

S
Stephen Hemminger 已提交
2888 2889 2890 2891
	if (WARN(atomic_read(&usage_count) == 0,
		 "warning: usage count=0, current_req=%p sect=%ld type=%x flags=%x\n",
		 current_req, (long)blk_rq_pos(current_req), current_req->cmd_type,
		 current_req->cmd_flags))
L
Linus Torvalds 已提交
2892
		return;
S
Stephen Hemminger 已提交
2893

2894
	if (test_and_set_bit(0, &fdc_busy)) {
L
Linus Torvalds 已提交
2895 2896
		/* fdc busy, this new request will be treated when the
		   current one is done */
2897
		is_alive(__func__, "old request running");
L
Linus Torvalds 已提交
2898 2899
		return;
	}
2900 2901 2902
	command_status = FD_COMMAND_NONE;
	__reschedule_timeout(MAXTIMEOUT, "fd_request");
	set_fdc(0);
L
Linus Torvalds 已提交
2903
	process_fd_request();
2904
	is_alive(__func__, "");
L
Linus Torvalds 已提交
2905 2906
}

2907
static const struct cont_t poll_cont = {
L
Linus Torvalds 已提交
2908 2909 2910 2911 2912 2913
	.interrupt	= success_and_wakeup,
	.redo		= floppy_ready,
	.error		= generic_failure,
	.done		= generic_done
};

2914
static int poll_drive(bool interruptible, int flag)
L
Linus Torvalds 已提交
2915 2916 2917 2918 2919 2920 2921
{
	/* 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;
2922
	debug_dcl(DP->flags, "setting NEWCHANGE in poll_drive\n");
2923
	set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
2924 2925

	return wait_til_done(floppy_ready, interruptible);
L
Linus Torvalds 已提交
2926 2927 2928 2929 2930 2931 2932 2933 2934
}

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

static void reset_intr(void)
{
2935
	pr_info("weird, reset interrupt called\n");
L
Linus Torvalds 已提交
2936 2937
}

2938
static const struct cont_t reset_cont = {
L
Linus Torvalds 已提交
2939 2940 2941 2942 2943 2944
	.interrupt	= reset_intr,
	.redo		= success_and_wakeup,
	.error		= generic_failure,
	.done		= generic_done
};

2945
static int user_reset_fdc(int drive, int arg, bool interruptible)
L
Linus Torvalds 已提交
2946 2947 2948
{
	int ret;

2949 2950 2951
	if (lock_fdc(drive, interruptible))
		return -EINTR;

L
Linus Torvalds 已提交
2952 2953 2954 2955
	if (arg == FD_RESET_ALWAYS)
		FDCS->reset = 1;
	if (FDCS->reset) {
		cont = &reset_cont;
2956 2957 2958
		ret = wait_til_done(reset_fdc, interruptible);
		if (ret == -EINTR)
			return -EINTR;
L
Linus Torvalds 已提交
2959 2960
	}
	process_fd_request();
2961
	return 0;
L
Linus Torvalds 已提交
2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973
}

/*
 * 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;
}

2974 2975
static inline int fd_copyin(void __user *param, void *address,
			    unsigned long size)
L
Linus Torvalds 已提交
2976 2977 2978 2979
{
	return copy_from_user(address, param, size) ? -EFAULT : 0;
}

2980
static const char *drive_name(int type, int drive)
L
Linus Torvalds 已提交
2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042
{
	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);
}

3043
static const struct cont_t raw_cmd_cont = {
L
Linus Torvalds 已提交
3044 3045 3046 3047 3048 3049
	.interrupt	= success_and_wakeup,
	.redo		= floppy_start,
	.error		= generic_failure,
	.done		= raw_cmd_done
};

3050
static int raw_cmd_copyout(int cmd, void __user *param,
L
Linus Torvalds 已提交
3051 3052 3053 3054 3055
				  struct floppy_raw_cmd *ptr)
{
	int ret;

	while (ptr) {
3056
		ret = copy_to_user(param, ptr, sizeof(*ptr));
3057 3058
		if (ret)
			return -EFAULT;
L
Linus Torvalds 已提交
3059 3060
		param += sizeof(struct floppy_raw_cmd);
		if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3061 3062 3063
			if (ptr->length >= 0 &&
			    ptr->length <= ptr->buffer_length) {
				long length = ptr->buffer_length - ptr->length;
3064 3065 3066 3067
				ret = fd_copyout(ptr->data, ptr->kernel_data,
						 length);
				if (ret)
					return ret;
3068
			}
L
Linus Torvalds 已提交
3069 3070 3071
		}
		ptr = ptr->next;
	}
3072

L
Linus Torvalds 已提交
3073 3074 3075 3076 3077
	return 0;
}

static void raw_cmd_free(struct floppy_raw_cmd **ptr)
{
3078 3079
	struct floppy_raw_cmd *next;
	struct floppy_raw_cmd *this;
L
Linus Torvalds 已提交
3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094

	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;
	}
}

3095
static int raw_cmd_copyin(int cmd, void __user *param,
L
Linus Torvalds 已提交
3096 3097 3098 3099 3100 3101 3102
				 struct floppy_raw_cmd **rcmd)
{
	struct floppy_raw_cmd *ptr;
	int ret;
	int i;

	*rcmd = NULL;
3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115

loop:
	ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
	if (!ptr)
		return -ENOMEM;
	*rcmd = ptr;
	ret = copy_from_user(ptr, param, sizeof(*ptr));
	if (ret)
		return -EFAULT;
	ptr->next = NULL;
	ptr->buffer_length = 0;
	param += sizeof(struct floppy_raw_cmd);
	if (ptr->cmd_count > 33)
L
Linus Torvalds 已提交
3116 3117 3118 3119 3120 3121 3122 3123
			/* 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...
			 */
3124 3125 3126 3127 3128 3129 3130 3131 3132
		return -EINVAL;

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

	if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
		if (ptr->length <= 0)
L
Linus Torvalds 已提交
3133
			return -EINVAL;
3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144
		ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length);
		fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
		if (!ptr->kernel_data)
			return -ENOMEM;
		ptr->buffer_length = ptr->length;
	}
	if (ptr->flags & FD_RAW_WRITE) {
		ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length);
		if (ret)
			return ret;
	}
L
Linus Torvalds 已提交
3145

3146
	if (ptr->flags & FD_RAW_MORE) {
L
Linus Torvalds 已提交
3147 3148
		rcmd = &(ptr->next);
		ptr->rate &= 0x43;
3149
		goto loop;
L
Linus Torvalds 已提交
3150
	}
3151 3152

	return 0;
L
Linus Torvalds 已提交
3153 3154 3155 3156 3157
}

static int raw_cmd_ioctl(int cmd, void __user *param)
{
	struct floppy_raw_cmd *my_raw_cmd;
3158 3159 3160
	int drive;
	int ret2;
	int ret;
L
Linus Torvalds 已提交
3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188

	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;
3189
	ret = wait_til_done(floppy_start, true);
3190
	debug_dcl(DP->flags, "calling disk change from raw_cmd ioctl\n");
L
Linus Torvalds 已提交
3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212

	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;
}

3213
static int set_geometry(unsigned int cmd, struct floppy_struct *g,
L
Linus Torvalds 已提交
3214 3215 3216 3217 3218 3219 3220 3221 3222
			       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 */
3223
	    (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
L
Linus Torvalds 已提交
3224 3225 3226 3227
		return -EINVAL;
	if (type) {
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;
3228
		mutex_lock(&open_lock);
3229
		if (lock_fdc(drive, true)) {
J
Jiri Slaby 已提交
3230 3231 3232
			mutex_unlock(&open_lock);
			return -EINTR;
		}
L
Linus Torvalds 已提交
3233 3234 3235 3236 3237 3238 3239 3240 3241 3242
		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;
3243
			__invalidate_device(bdev, true);
L
Linus Torvalds 已提交
3244
		}
3245
		mutex_unlock(&open_lock);
L
Linus Torvalds 已提交
3246 3247
	} else {
		int oldStretch;
3248

3249
		if (lock_fdc(drive, true))
3250
			return -EINTR;
3251
		if (cmd != FDDEFPRM) {
L
Linus Torvalds 已提交
3252 3253
			/* notice a disk change immediately, else
			 * we lose our settings immediately*/
3254
			if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3255 3256
				return -EINTR;
		}
L
Linus Torvalds 已提交
3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274
		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) &
3275
		     (FD_SWAPSIDES | FD_SECTBASEMASK)))
L
Linus Torvalds 已提交
3276 3277 3278 3279 3280 3281 3282 3283
			invalidate_drive(bdev);
		else
			process_fd_request();
	}
	return 0;
}

/* handle obsolete ioctl's */
3284
static unsigned int ioctl_table[] = {
L
Linus Torvalds 已提交
3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311
	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
};

3312
static int normalize_ioctl(unsigned int *cmd, int *size)
L
Linus Torvalds 已提交
3313 3314 3315 3316 3317 3318 3319 3320
{
	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)) {
3321
				pr_info("ioctl not yet supported\n");
L
Linus Torvalds 已提交
3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334
				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 {
3335
		if (lock_fdc(drive, false))
3336
			return -EINTR;
3337
		if (poll_drive(false, 0) == -EINTR)
3338
			return -EINTR;
L
Linus Torvalds 已提交
3339 3340 3341 3342 3343 3344 3345 3346
		process_fd_request();
		*g = current_type[drive];
	}
	if (!*g)
		return -ENODEV;
	return 0;
}

3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363
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;
}

3364
static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
L
Linus Torvalds 已提交
3365 3366
		    unsigned long param)
{
A
Al Viro 已提交
3367
	int drive = (long)bdev->bd_disk->private_data;
3368 3369
	int type = ITYPE(UDRS->fd_device);
	int i;
L
Linus Torvalds 已提交
3370 3371 3372 3373 3374 3375 3376 3377
	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 */
3378
	const void *outparam;	/* parameters passed back to user space */
L
Linus Torvalds 已提交
3379 3380 3381 3382 3383

	/* 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 */
3384
	    cmd == 0x6470) {		/* SunOS floppy eject */
L
Linus Torvalds 已提交
3385 3386 3387 3388 3389
		DPRINT("obsolete eject ioctl\n");
		DPRINT("please use floppycontrol --eject\n");
		cmd = FDEJECT;
	}

3390
	if (!((cmd & 0xff00) == 0x0200))
L
Linus Torvalds 已提交
3391 3392
		return -EINVAL;

3393
	/* convert the old style command into a new style command */
3394 3395 3396
	ret = normalize_ioctl(&cmd, &size);
	if (ret)
		return ret;
3397

L
Linus Torvalds 已提交
3398
	/* permission checks */
3399
	if (((cmd & 0x40) && !(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) ||
L
Linus Torvalds 已提交
3400 3401 3402
	    ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
		return -EPERM;

3403 3404 3405
	if (WARN_ON(size < 0 || size > sizeof(inparam)))
		return -EINVAL;

L
Linus Torvalds 已提交
3406
	/* copyin */
3407
	memset(&inparam, 0, sizeof(inparam));
3408 3409 3410 3411 3412
	if (_IOC_DIR(cmd) & _IOC_WRITE) {
		ret = fd_copyin((void __user *)param, &inparam, size);
		if (ret)
			return ret;
	}
L
Linus Torvalds 已提交
3413

3414 3415 3416 3417 3418
	switch (cmd) {
	case FDEJECT:
		if (UDRS->fd_ref != 1)
			/* somebody else has this drive open */
			return -EBUSY;
3419
		if (lock_fdc(drive, true))
3420
			return -EINTR;
L
Linus Torvalds 已提交
3421

3422 3423 3424
		/* do the actual eject. Fails on
		 * non-Sparc architectures */
		ret = fd_eject(UNIT(drive));
L
Linus Torvalds 已提交
3425

3426 3427
		set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
		set_bit(FD_VERIFY_BIT, &UDRS->flags);
3428 3429 3430
		process_fd_request();
		return ret;
	case FDCLRPRM:
3431
		if (lock_fdc(drive, true))
3432
			return -EINTR;
3433 3434 3435 3436 3437 3438 3439 3440
		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:
3441
		ret = get_floppy_geometry(drive, type,
3442
					  (struct floppy_struct **)&outparam);
3443 3444
		if (ret)
			return ret;
3445 3446 3447 3448 3449 3450 3451 3452
		break;
	case FDMSGON:
		UDP->flags |= FTD_MSG;
		return 0;
	case FDMSGOFF:
		UDP->flags &= ~FTD_MSG;
		return 0;
	case FDFMTBEG:
3453
		if (lock_fdc(drive, true))
3454
			return -EINTR;
3455
		if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3456
			return -EINTR;
3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469
		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:
3470
		if (lock_fdc(drive, true))
3471
			return -EINTR;
3472 3473 3474 3475 3476
		return invalidate_drive(bdev);
	case FDSETEMSGTRESH:
		UDP->max_errors.reporting = (unsigned short)(param & 0x0f);
		return 0;
	case FDGETMAXERRS:
3477
		outparam = &UDP->max_errors;
3478 3479 3480 3481 3482 3483
		break;
	case FDSETMAXERRS:
		UDP->max_errors = inparam.max_errors;
		break;
	case FDGETDRVTYP:
		outparam = drive_name(type, drive);
3484
		SUPBOUND(size, strlen((const char *)outparam) + 1);
3485 3486 3487 3488 3489
		break;
	case FDSETDRVPRM:
		*UDP = inparam.dp;
		break;
	case FDGETDRVPRM:
3490
		outparam = UDP;
3491 3492
		break;
	case FDPOLLDRVSTAT:
3493
		if (lock_fdc(drive, true))
3494
			return -EINTR;
3495
		if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3496
			return -EINTR;
3497 3498 3499
		process_fd_request();
		/* fall through */
	case FDGETDRVSTAT:
3500
		outparam = UDRS;
3501 3502
		break;
	case FDRESET:
3503
		return user_reset_fdc(drive, (int)param, true);
3504
	case FDGETFDCSTAT:
3505
		outparam = UFDCS;
3506 3507 3508 3509 3510
		break;
	case FDWERRORCLR:
		memset(UDRWE, 0, sizeof(*UDRWE));
		return 0;
	case FDWERRORGET:
3511
		outparam = UDRWE;
3512 3513 3514
		break;
	case FDRAWCMD:
		if (type)
L
Linus Torvalds 已提交
3515
			return -EINVAL;
3516
		if (lock_fdc(drive, true))
3517
			return -EINTR;
3518
		set_floppy(drive);
3519 3520 3521
		i = raw_cmd_ioctl(cmd, (void __user *)param);
		if (i == -EINTR)
			return -EINTR;
3522 3523 3524
		process_fd_request();
		return i;
	case FDTWADDLE:
3525
		if (lock_fdc(drive, true))
3526
			return -EINTR;
3527 3528 3529 3530 3531 3532
		twaddle();
		process_fd_request();
		return 0;
	default:
		return -EINVAL;
	}
L
Linus Torvalds 已提交
3533 3534 3535

	if (_IOC_DIR(cmd) & _IOC_READ)
		return fd_copyout((void __user *)param, outparam, size);
3536 3537

	return 0;
L
Linus Torvalds 已提交
3538 3539
}

3540 3541 3542 3543 3544
static int fd_ioctl(struct block_device *bdev, fmode_t mode,
			     unsigned int cmd, unsigned long param)
{
	int ret;

3545
	mutex_lock(&floppy_mutex);
3546
	ret = fd_locked_ioctl(bdev, mode, cmd, param);
3547
	mutex_unlock(&floppy_mutex);
3548 3549 3550 3551

	return ret;
}

L
Linus Torvalds 已提交
3552 3553
static void __init config_types(void)
{
3554
	bool has_drive = false;
L
Linus Torvalds 已提交
3555 3556 3557 3558 3559 3560 3561 3562 3563 3564
	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;

3565
	/* FIXME: additional physical CMOS drive detection should go here */
L
Linus Torvalds 已提交
3566 3567 3568 3569 3570 3571 3572

	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];

3573
		if (type < ARRAY_SIZE(default_drive_params)) {
L
Linus Torvalds 已提交
3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585
			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) {
3586 3587 3588 3589 3590 3591 3592
			const char *prepend;
			if (!has_drive) {
				prepend = "";
				has_drive = true;
				pr_info("Floppy drive(s):");
			} else {
				prepend = ",";
L
Linus Torvalds 已提交
3593
			}
3594 3595

			pr_cont("%s fd%d is %s", prepend, drive, name);
L
Linus Torvalds 已提交
3596 3597 3598
		}
		*UDP = *params;
	}
3599 3600 3601

	if (has_drive)
		pr_cont("\n");
L
Linus Torvalds 已提交
3602 3603
}

A
Al Viro 已提交
3604
static int floppy_release(struct gendisk *disk, fmode_t mode)
L
Linus Torvalds 已提交
3605
{
A
Al Viro 已提交
3606
	int drive = (long)disk->private_data;
L
Linus Torvalds 已提交
3607

3608
	mutex_lock(&floppy_mutex);
3609
	mutex_lock(&open_lock);
3610
	if (!UDRS->fd_ref--) {
L
Linus Torvalds 已提交
3611 3612 3613 3614 3615
		DPRINT("floppy_release with fd_ref == 0");
		UDRS->fd_ref = 0;
	}
	if (!UDRS->fd_ref)
		opened_bdev[drive] = NULL;
3616
	mutex_unlock(&open_lock);
3617
	mutex_unlock(&floppy_mutex);
3618

L
Linus Torvalds 已提交
3619 3620 3621 3622 3623 3624 3625 3626
	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
3627
static int floppy_open(struct block_device *bdev, fmode_t mode)
L
Linus Torvalds 已提交
3628
{
A
Al Viro 已提交
3629 3630
	int drive = (long)bdev->bd_disk->private_data;
	int old_dev, new_dev;
L
Linus Torvalds 已提交
3631 3632 3633 3634
	int try;
	int res = -EBUSY;
	char *tmp;

3635
	mutex_lock(&floppy_mutex);
3636
	mutex_lock(&open_lock);
L
Linus Torvalds 已提交
3637
	old_dev = UDRS->fd_device;
A
Al Viro 已提交
3638
	if (opened_bdev[drive] && opened_bdev[drive] != bdev)
L
Linus Torvalds 已提交
3639 3640 3641
		goto out2;

	if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) {
3642 3643
		set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
		set_bit(FD_VERIFY_BIT, &UDRS->flags);
L
Linus Torvalds 已提交
3644 3645
	}

3646
	UDRS->fd_ref++;
L
Linus Torvalds 已提交
3647

A
Al Viro 已提交
3648
	opened_bdev[drive] = bdev;
L
Linus Torvalds 已提交
3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665

	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);
		}
3666
		if (!tmp && !floppy_track_buffer)
L
Linus Torvalds 已提交
3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681
			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
3682 3683 3684 3685
	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
3686 3687 3688 3689 3690 3691 3692
		if (buffer_drive == drive)
			buffer_track = -1;
	}

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

A
Al Viro 已提交
3693 3694
	if (!(mode & FMODE_NDELAY)) {
		if (mode & (FMODE_READ|FMODE_WRITE)) {
L
Linus Torvalds 已提交
3695
			UDRS->last_checked = 0;
A
Al Viro 已提交
3696
			check_disk_change(bdev);
3697
			if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags))
L
Linus Torvalds 已提交
3698 3699 3700
				goto out;
		}
		res = -EROFS;
3701 3702
		if ((mode & FMODE_WRITE) &&
		    !test_bit(FD_DISK_WRITABLE_BIT, &UDRS->flags))
L
Linus Torvalds 已提交
3703 3704
			goto out;
	}
3705
	mutex_unlock(&open_lock);
3706
	mutex_unlock(&floppy_mutex);
L
Linus Torvalds 已提交
3707 3708
	return 0;
out:
3709 3710
	UDRS->fd_ref--;

L
Linus Torvalds 已提交
3711 3712 3713
	if (!UDRS->fd_ref)
		opened_bdev[drive] = NULL;
out2:
3714
	mutex_unlock(&open_lock);
3715
	mutex_unlock(&floppy_mutex);
L
Linus Torvalds 已提交
3716 3717 3718 3719 3720 3721
	return res;
}

/*
 * Check if the disk has been changed or if a change has been faked.
 */
3722 3723
static unsigned int floppy_check_events(struct gendisk *disk,
					unsigned int clearing)
L
Linus Torvalds 已提交
3724 3725 3726
{
	int drive = (long)disk->private_data;

3727 3728
	if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
	    test_bit(FD_VERIFY_BIT, &UDRS->flags))
3729
		return DISK_EVENT_MEDIA_CHANGE;
L
Linus Torvalds 已提交
3730

3731
	if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) {
3732 3733
		lock_fdc(drive, false);
		poll_drive(false, 0);
L
Linus Torvalds 已提交
3734 3735 3736
		process_fd_request();
	}

3737 3738
	if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
	    test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
L
Linus Torvalds 已提交
3739
	    test_bit(drive, &fake_change) ||
3740
	    drive_no_geom(drive))
3741
		return DISK_EVENT_MEDIA_CHANGE;
L
Linus Torvalds 已提交
3742 3743 3744 3745 3746 3747 3748 3749 3750
	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.
 */

3751
static void floppy_rb0_complete(struct bio *bio, int err)
L
Linus Torvalds 已提交
3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783
{
	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;
3784
	bio.bi_flags = (1 << BIO_QUIET);
L
Linus Torvalds 已提交
3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807
	init_completion(&complete);
	bio.bi_private = &complete;
	bio.bi_end_io = floppy_rb0_complete;

	submit_bio(READ, &bio);
	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;
	int cf;
	int res = 0;

3808 3809
	if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
	    test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
3810 3811
	    test_bit(drive, &fake_change) ||
	    drive_no_geom(drive)) {
S
Stephen Hemminger 已提交
3812 3813
		if (WARN(atomic_read(&usage_count) == 0,
			 "VFS: revalidate called on non-open device.\n"))
L
Linus Torvalds 已提交
3814
			return -EFAULT;
S
Stephen Hemminger 已提交
3815

3816
		lock_fdc(drive, false);
3817 3818
		cf = (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
		      test_bit(FD_VERIFY_BIT, &UDRS->flags));
3819
		if (!(cf || test_bit(drive, &fake_change) || drive_no_geom(drive))) {
L
Linus Torvalds 已提交
3820 3821 3822 3823 3824 3825 3826 3827
			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);
3828
		clear_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
L
Linus Torvalds 已提交
3829 3830
		if (cf)
			UDRS->generation++;
3831
		if (drive_no_geom(drive)) {
L
Linus Torvalds 已提交
3832 3833 3834 3835
			/* auto-sensing */
			res = __floppy_read_block_0(opened_bdev[drive]);
		} else {
			if (cf)
3836
				poll_drive(false, FD_RAW_NEED_DISK);
L
Linus Torvalds 已提交
3837 3838 3839 3840 3841 3842 3843
			process_fd_request();
		}
	}
	set_capacity(disk, floppy_sizes[UDRS->fd_device]);
	return res;
}

3844
static const struct block_device_operations floppy_fops = {
3845
	.owner			= THIS_MODULE,
A
Al Viro 已提交
3846 3847
	.open			= floppy_open,
	.release		= floppy_release,
3848
	.ioctl			= fd_ioctl,
3849
	.getgeo			= fd_getgeo,
3850
	.check_events		= floppy_check_events,
3851
	.revalidate_disk	= floppy_revalidate,
L
Linus Torvalds 已提交
3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867
};

/*
 * 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;
3868 3869
	r = result();
	if (r <= 0x00)
L
Linus Torvalds 已提交
3870 3871
		return FDC_NONE;	/* No FDC present ??? */
	if ((r == 1) && (reply_buffer[0] == 0x80)) {
3872
		pr_info("FDC %d is an 8272A\n", fdc);
L
Linus Torvalds 已提交
3873 3874 3875
		return FDC_8272A;	/* 8272a/765 don't know DUMPREGS */
	}
	if (r != 10) {
3876 3877
		pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
			fdc, r);
L
Linus Torvalds 已提交
3878 3879 3880 3881
		return FDC_UNKNOWN;
	}

	if (!fdc_configure()) {
3882
		pr_info("FDC %d is an 82072\n", fdc);
L
Linus Torvalds 已提交
3883 3884 3885 3886 3887 3888 3889
		return FDC_82072;	/* 82072 doesn't know CONFIGURE */
	}

	output_byte(FD_PERPENDICULAR);
	if (need_more_output() == MORE_OUTPUT) {
		output_byte(0);
	} else {
3890
		pr_info("FDC %d is an 82072A\n", fdc);
L
Linus Torvalds 已提交
3891 3892 3893 3894 3895 3896
		return FDC_82072A;	/* 82072A as found on Sparcs. */
	}

	output_byte(FD_UNLOCK);
	r = result();
	if ((r == 1) && (reply_buffer[0] == 0x80)) {
3897
		pr_info("FDC %d is a pre-1991 82077\n", fdc);
3898
		return FDC_82077_ORIG;	/* Pre-1991 82077, doesn't know
L
Linus Torvalds 已提交
3899 3900 3901
					 * LOCK/UNLOCK */
	}
	if ((r != 1) || (reply_buffer[0] != 0x00)) {
3902 3903
		pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
			fdc, r);
L
Linus Torvalds 已提交
3904 3905 3906 3907 3908
		return FDC_UNKNOWN;
	}
	output_byte(FD_PARTID);
	r = result();
	if (r != 1) {
3909 3910
		pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n",
			fdc, r);
L
Linus Torvalds 已提交
3911 3912 3913
		return FDC_UNKNOWN;
	}
	if (reply_buffer[0] == 0x80) {
3914
		pr_info("FDC %d is a post-1991 82077\n", fdc);
L
Linus Torvalds 已提交
3915 3916 3917 3918 3919
		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 */
3920
		pr_info("FDC %d is an 82078.\n", fdc);
L
Linus Torvalds 已提交
3921 3922
		return FDC_82078;
	case 0x1:
3923
		pr_info("FDC %d is a 44pin 82078\n", fdc);
L
Linus Torvalds 已提交
3924 3925
		return FDC_82078;
	case 0x2:
3926
		pr_info("FDC %d is a S82078B\n", fdc);
L
Linus Torvalds 已提交
3927 3928
		return FDC_S82078B;
	case 0x3:
3929
		pr_info("FDC %d is a National Semiconductor PC87306\n", fdc);
L
Linus Torvalds 已提交
3930 3931
		return FDC_87306;
	default:
3932 3933
		pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
			fdc, reply_buffer[0] >> 5);
L
Linus Torvalds 已提交
3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044
		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)
4045 4046 4047
					config_params[i].fn(ints, param,
							    config_params[i].
							    param2);
L
Linus Torvalds 已提交
4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060
				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++)
4061 4062
			pr_cont(" %s", config_params[i].name);
		pr_cont("\n");
L
Linus Torvalds 已提交
4063 4064
	} else
		DPRINT("botched floppy option\n");
4065
	DPRINT("Read Documentation/blockdev/floppy.txt\n");
L
Linus Torvalds 已提交
4066 4067 4068 4069 4070
	return 0;
}

static int have_no_fdc = -ENODEV;

4071 4072
static ssize_t floppy_cmos_show(struct device *dev,
				struct device_attribute *attr, char *buf)
4073
{
4074
	struct platform_device *p = to_platform_device(dev);
4075
	int drive;
4076

4077 4078
	drive = p->id;
	return sprintf(buf, "%X\n", UDP->cmos);
4079
}
4080

4081
static DEVICE_ATTR(cmos, S_IRUGO, floppy_cmos_show, NULL);
4082

L
Linus Torvalds 已提交
4083 4084 4085 4086
static void floppy_device_release(struct device *dev)
{
}

F
Frans Pop 已提交
4087
static int floppy_resume(struct device *dev)
O
Ondrej Zary 已提交
4088 4089 4090 4091 4092
{
	int fdc;

	for (fdc = 0; fdc < N_FDC; fdc++)
		if (FDCS->address != -1)
4093
			user_reset_fdc(-1, FD_RESET_ALWAYS, false);
O
Ondrej Zary 已提交
4094 4095 4096 4097

	return 0;
}

4098
static const struct dev_pm_ops floppy_pm_ops = {
O
Ondrej Zary 已提交
4099
	.resume = floppy_resume,
F
Frans Pop 已提交
4100 4101 4102 4103
	.restore = floppy_resume,
};

static struct platform_driver floppy_driver = {
O
Ondrej Zary 已提交
4104
	.driver = {
4105 4106
		   .name = "floppy",
		   .pm = &floppy_pm_ops,
O
Ondrej Zary 已提交
4107 4108 4109
	},
};

4110
static struct platform_device floppy_device[N_DRIVE];
L
Linus Torvalds 已提交
4111

4112 4113 4114 4115 4116 4117 4118 4119 4120
static bool floppy_available(int drive)
{
	if (!(allowed_drive_mask & (1 << drive)))
		return false;
	if (fdc_state[FDC(drive)].version == FDC_NONE)
		return false;
	return true;
}

L
Linus Torvalds 已提交
4121 4122 4123
static struct kobject *floppy_find(dev_t dev, int *part, void *data)
{
	int drive = (*part & 3) | ((*part & 0x80) >> 5);
4124
	if (drive >= N_DRIVE || !floppy_available(drive))
L
Linus Torvalds 已提交
4125
		return NULL;
4126
	if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type))
L
Linus Torvalds 已提交
4127 4128 4129 4130 4131
		return NULL;
	*part = 0;
	return get_disk(disks[drive]);
}

4132
static int __init do_floppy_init(void)
L
Linus Torvalds 已提交
4133
{
4134
	int i, unit, drive, err;
L
Linus Torvalds 已提交
4135

4136 4137 4138
	set_debugt();
	interruptjiffies = resultjiffies = jiffies;

4139
#if defined(CONFIG_PPC)
4140 4141 4142 4143
	if (check_legacy_ioport(FDC1))
		return -ENODEV;
#endif

L
Linus Torvalds 已提交
4144 4145
	raw_cmd = NULL;

4146 4147 4148 4149
	floppy_wq = alloc_ordered_workqueue("floppy", 0);
	if (!floppy_wq)
		return -ENOMEM;

4150 4151 4152
	for (drive = 0; drive < N_DRIVE; drive++) {
		disks[drive] = alloc_disk(1);
		if (!disks[drive]) {
L
Linus Torvalds 已提交
4153 4154 4155 4156
			err = -ENOMEM;
			goto out_put_disk;
		}

4157 4158
		disks[drive]->queue = blk_init_queue(do_fd_request, &floppy_lock);
		if (!disks[drive]->queue) {
4159
			err = -ENOMEM;
4160
			goto out_put_disk;
4161 4162
		}

4163 4164 4165 4166 4167
		blk_queue_max_hw_sectors(disks[drive]->queue, 64);
		disks[drive]->major = FLOPPY_MAJOR;
		disks[drive]->first_minor = TOMINOR(drive);
		disks[drive]->fops = &floppy_fops;
		sprintf(disks[drive]->disk_name, "fd%d", drive);
L
Linus Torvalds 已提交
4168

4169 4170 4171
		init_timer(&motor_off_timer[drive]);
		motor_off_timer[drive].data = drive;
		motor_off_timer[drive].function = motor_off_callback;
L
Linus Torvalds 已提交
4172 4173 4174 4175
	}

	err = register_blkdev(FLOPPY_MAJOR, "fd");
	if (err)
4176
		goto out_put_disk;
L
Linus Torvalds 已提交
4177

O
Ondrej Zary 已提交
4178 4179 4180 4181
	err = platform_driver_register(&floppy_driver);
	if (err)
		goto out_unreg_blkdev;

L
Linus Torvalds 已提交
4182 4183 4184 4185 4186 4187 4188 4189 4190
	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;

4191
	reschedule_timeout(MAXTIMEOUT, "floppy init");
L
Linus Torvalds 已提交
4192 4193 4194 4195
	config_types();

	for (i = 0; i < N_FDC; i++) {
		fdc = i;
4196
		memset(FDCS, 0, sizeof(*FDCS));
L
Linus Torvalds 已提交
4197 4198 4199
		FDCS->dtr = -1;
		FDCS->dor = 0x4;
#if defined(__sparc__) || defined(__mc68000__)
4200
	/*sparcs/sun3x don't have a DOR reset which we can fall back on to */
L
Linus Torvalds 已提交
4201 4202 4203 4204 4205 4206 4207 4208 4209 4210
#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) {
4211
		cancel_delayed_work(&fd_timeout);
L
Linus Torvalds 已提交
4212 4213 4214 4215 4216 4217 4218 4219 4220 4221
		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) {
4222
		cancel_delayed_work(&fd_timeout);
L
Linus Torvalds 已提交
4223 4224 4225 4226 4227 4228
		err = -EBUSY;
		goto out_unreg_region;
	}

	/* initialise drive state */
	for (drive = 0; drive < N_DRIVE; drive++) {
4229 4230
		memset(UDRS, 0, sizeof(*UDRS));
		memset(UDRWE, 0, sizeof(*UDRWE));
4231 4232 4233
		set_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
		set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
		set_bit(FD_VERIFY_BIT, &UDRS->flags);
L
Linus Torvalds 已提交
4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252
		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;
4253
		if (user_reset_fdc(-1, FD_RESET_ALWAYS, false)) {
L
Linus Torvalds 已提交
4254
			/* free ioports reserved by floppy_grab_irq_and_dma() */
4255
			floppy_release_regions(fdc);
L
Linus Torvalds 已提交
4256 4257 4258 4259 4260 4261 4262 4263
			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() */
4264
			floppy_release_regions(fdc);
L
Linus Torvalds 已提交
4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275
			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.
		 */
4276
		user_reset_fdc(-1, FD_RESET_ALWAYS, false);
L
Linus Torvalds 已提交
4277 4278
	}
	fdc = 0;
4279
	cancel_delayed_work(&fd_timeout);
L
Linus Torvalds 已提交
4280
	current_drive = 0;
4281
	initialized = true;
L
Linus Torvalds 已提交
4282 4283 4284
	if (have_no_fdc) {
		DPRINT("no floppy controllers found\n");
		err = have_no_fdc;
4285
		goto out_release_dma;
L
Linus Torvalds 已提交
4286 4287 4288
	}

	for (drive = 0; drive < N_DRIVE; drive++) {
4289
		if (!floppy_available(drive))
L
Linus Torvalds 已提交
4290
			continue;
4291 4292 4293 4294 4295 4296 4297

		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)
4298
			goto out_remove_drives;
4299

4300 4301
		err = device_create_file(&floppy_device[drive].dev,
					 &dev_attr_cmos);
4302 4303 4304
		if (err)
			goto out_unreg_platform_dev;

L
Linus Torvalds 已提交
4305 4306 4307
		/* to be cleaned up... */
		disks[drive]->private_data = (void *)(long)drive;
		disks[drive]->flags |= GENHD_FL_REMOVABLE;
4308
		disks[drive]->driverfs_dev = &floppy_device[drive].dev;
L
Linus Torvalds 已提交
4309 4310 4311 4312 4313
		add_disk(disks[drive]);
	}

	return 0;

4314 4315
out_unreg_platform_dev:
	platform_device_unregister(&floppy_device[drive]);
4316 4317
out_remove_drives:
	while (drive--) {
4318
		if (floppy_available(drive)) {
4319 4320 4321 4322 4323
			del_gendisk(disks[drive]);
			device_remove_file(&floppy_device[drive].dev, &dev_attr_cmos);
			platform_device_unregister(&floppy_device[drive]);
		}
	}
4324
out_release_dma:
4325
	if (atomic_read(&usage_count))
L
Linus Torvalds 已提交
4326 4327 4328
		floppy_release_irq_and_dma();
out_unreg_region:
	blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
O
Ondrej Zary 已提交
4329
	platform_driver_unregister(&floppy_driver);
L
Linus Torvalds 已提交
4330 4331 4332
out_unreg_blkdev:
	unregister_blkdev(FLOPPY_MAJOR, "fd");
out_put_disk:
4333 4334 4335 4336 4337 4338 4339
	for (drive = 0; drive < N_DRIVE; drive++) {
		if (!disks[drive])
			break;
		if (disks[drive]->queue) {
			del_timer_sync(&motor_off_timer[drive]);
			blk_cleanup_queue(disks[drive]->queue);
			disks[drive]->queue = NULL;
4340
		}
4341
		put_disk(disks[drive]);
L
Linus Torvalds 已提交
4342
	}
4343
	destroy_workqueue(floppy_wq);
L
Linus Torvalds 已提交
4344 4345 4346
	return err;
}

4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364
#ifndef MODULE
static __init void floppy_async_init(void *data, async_cookie_t cookie)
{
	do_floppy_init();
}
#endif

static int __init floppy_init(void)
{
#ifdef MODULE
	return do_floppy_init();
#else
	/* Don't hold up the bootup by the floppy initialization */
	async_schedule(floppy_async_init, NULL);
	return 0;
#endif
}

4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391
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++) {
4392 4393 4394 4395
		if (!request_region(FDCS->address + p->offset,
				    p->size, "floppy")) {
			DPRINT("Floppy io-port 0x%04lx in use\n",
			       FDCS->address + p->offset);
4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407
			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));
}

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static int floppy_grab_irq_and_dma(void)
{
4410
	if (atomic_inc_return(&usage_count) > 1)
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4411
		return 0;
4412 4413 4414 4415 4416

	/*
	 * We might have scheduled a free_irq(), wait it to
	 * drain first:
	 */
4417
	flush_workqueue(floppy_wq);
4418

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	if (fd_request_irq()) {
		DPRINT("Unable to grab IRQ%d for the floppy driver\n",
		       FLOPPY_IRQ);
4422
		atomic_dec(&usage_count);
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		return -1;
	}
	if (fd_request_dma()) {
		DPRINT("Unable to grab DMA%d for the floppy driver\n",
		       FLOPPY_DMA);
4428 4429 4430 4431
		if (can_use_virtual_dma & 2)
			use_virtual_dma = can_use_virtual_dma = 1;
		if (!(can_use_virtual_dma & 1)) {
			fd_free_irq();
4432
			atomic_dec(&usage_count);
4433 4434
			return -1;
		}
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4435 4436 4437 4438
	}

	for (fdc = 0; fdc < N_FDC; fdc++) {
		if (FDCS->address != -1) {
4439 4440
			if (floppy_request_regions(fdc))
				goto cleanup;
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		}
	}
	for (fdc = 0; fdc < N_FDC; fdc++) {
		if (FDCS->address != -1) {
			reset_fdc_info(1);
			fd_outb(FDCS->dor, FD_DOR);
		}
	}
	fdc = 0;
	set_dor(0, ~0, 8);	/* avoid immediate interrupt */

	for (fdc = 0; fdc < N_FDC; fdc++)
		if (FDCS->address != -1)
			fd_outb(FDCS->dor, FD_DOR);
	/*
4456 4457
	 * 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;
4462
cleanup:
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	fd_free_irq();
	fd_free_dma();
4465 4466
	while (--fdc >= 0)
		floppy_release_regions(fdc);
4467
	atomic_dec(&usage_count);
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	return -1;
}

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

4480
	if (!atomic_dec_and_test(&usage_count))
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4481
		return;
4482

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	if (irqdma_allocated) {
		fd_disable_dma();
		fd_free_dma();
4486
		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

	if (floppy_track_buffer && max_buffer_sectors) {
		tmpsize = max_buffer_sectors * 1024;
		tmpaddr = (unsigned long)floppy_track_buffer;
		floppy_track_buffer = NULL;
		max_buffer_sectors = 0;
		buffer_min = buffer_max = -1;
		fd_dma_mem_free(tmpaddr, tmpsize);
	}
#ifndef __sparc__
	for (drive = 0; drive < N_FDC * 4; drive++)
		if (timer_pending(motor_off_timer + drive))
4505
			pr_info("motor off timer %d still active\n", drive);
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#endif

4508
	if (delayed_work_pending(&fd_timeout))
4509
		pr_info("floppy timer still active:%s\n", timeout_message);
4510
	if (delayed_work_pending(&fd_timer))
4511
		pr_info("auxiliary floppy timer still active\n");
4512
	if (work_pending(&floppy_work))
4513
		pr_info("work still pending\n");
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4514 4515
	old_fdc = fdc;
	for (fdc = 0; fdc < N_FDC; fdc++)
4516 4517
		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) {
4530 4531 4532
		ptr = cfg;
		while (*cfg && *cfg != ' ' && *cfg != '\t')
			cfg++;
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4533 4534 4535 4536 4537 4538 4539 4540 4541
		if (*cfg) {
			*cfg = '\0';
			cfg++;
		}
		if (*ptr)
			floppy_setup(ptr);
	}
}

4542
static int __init floppy_module_init(void)
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4543 4544 4545 4546 4547
{
	if (floppy)
		parse_floppy_cfg_string(floppy);
	return floppy_init();
}
4548
module_init(floppy_module_init);
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4549

4550
static void __exit floppy_module_exit(void)
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4551 4552 4553 4554 4555
{
	int drive;

	blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
	unregister_blkdev(FLOPPY_MAJOR, "fd");
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4556
	platform_driver_unregister(&floppy_driver);
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4557 4558 4559 4560

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

4561
		if (floppy_available(drive)) {
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4562
			del_gendisk(disks[drive]);
4563 4564
			device_remove_file(&floppy_device[drive].dev, &dev_attr_cmos);
			platform_device_unregister(&floppy_device[drive]);
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Linus Torvalds 已提交
4565
		}
4566
		blk_cleanup_queue(disks[drive]->queue);
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Vivek Goyal 已提交
4567 4568 4569 4570 4571 4572 4573 4574 4575

		/*
		 * These disks have not called add_disk().  Don't put down
		 * queue reference in put_disk().
		 */
		if (!(allowed_drive_mask & (1 << drive)) ||
		    fdc_state[FDC(drive)].version == FDC_NONE)
			disks[drive]->queue = NULL;

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Vivek Goyal 已提交
4576
		put_disk(disks[drive]);
L
Linus Torvalds 已提交
4577 4578
	}

4579 4580 4581
	cancel_delayed_work_sync(&fd_timeout);
	cancel_delayed_work_sync(&fd_timer);
	destroy_workqueue(floppy_wq);
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4582

4583
	if (atomic_read(&usage_count))
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4584 4585 4586 4587 4588
		floppy_release_irq_and_dma();

	/* eject disk, if any */
	fd_eject(0);
}
4589

4590
module_exit(floppy_module_exit);
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4591 4592 4593 4594 4595 4596 4597 4598

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");

4599 4600
/* This doesn't actually get used other than for module information */
static const struct pnp_device_id floppy_pnpids[] = {
4601 4602
	{"PNP0700", 0},
	{}
4603
};
4604

4605 4606
MODULE_DEVICE_TABLE(pnp, floppy_pnpids);

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4607 4608 4609 4610 4611 4612 4613
#else

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

MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);