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ataflop.c

/*
 *  drivers/block/ataflop.c
 *
 *  Copyright (C) 1993  Greg Harp
 *  Atari Support by Bjoern Brauel, Roman Hodek
 *
 *  Big cleanup Sep 11..14 1994 Roman Hodek:
 *   - Driver now works interrupt driven
 *   - Support for two drives; should work, but I cannot test that :-(
 *   - Reading is done in whole tracks and buffered to speed up things
 *   - Disk change detection and drive deselecting after motor-off
 *     similar to TOS
 *   - Autodetection of disk format (DD/HD); untested yet, because I
 *     don't have an HD drive :-(
 *
 *  Fixes Nov 13 1994 Martin Schaller:
 *   - Autodetection works now
 *   - Support for 5 1/4'' disks
 *   - Removed drive type (unknown on atari)
 *   - Do seeks with 8 Mhz
 *
 *  Changes by Andreas Schwab:
 *   - After errors in multiple read mode try again reading single sectors
 *  (Feb 1995):
 *   - Clean up error handling
 *   - Set blk_size for proper size checking
 *   - Initialize track register when testing presence of floppy
 *   - Implement some ioctl's
 *
 *  Changes by Torsten Lang:
 *   - When probing the floppies we should add the FDCCMDADD_H flag since
 *     the FDC will otherwise wait forever when no disk is inserted...
 *
 * ++ Freddi Aschwanden (fa) 20.9.95 fixes for medusa:
 *  - MFPDELAY() after each FDC access -> atari 
 *  - more/other disk formats
 *  - DMA to the block buffer directly if we have a 32bit DMA
 *  - for medusa, the step rate is always 3ms
 *  - on medusa, use only cache_push()
 * Roman:
 *  - Make disk format numbering independent from minors
 *  - Let user set max. supported drive type (speeds up format
 *    detection, saves buffer space)
 *
 * Roman 10/15/95:
 *  - implement some more ioctls
 *  - disk formatting
 *  
 * Andreas 95/12/12:
 *  - increase gap size at start of track for HD/ED disks
 *
 * Michael (MSch) 11/07/96:
 *  - implemented FDSETPRM and FDDEFPRM ioctl
 *
 * Andreas (97/03/19):
 *  - implemented missing BLK* ioctls
 *
 *  Things left to do:
 *   - Formatting
 *   - Maybe a better strategy for disk change detection (does anyone
 *     know one?)
 */

#include <linux/module.h>

#include <linux/fd.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/blkdev.h>

#include <asm/atafd.h>
#include <asm/atafdreg.h>
#include <asm/atariints.h>
#include <asm/atari_stdma.h>
#include <asm/atari_stram.h>

#define     FD_MAX_UNITS 2

#undef DEBUG

static struct request_queue *floppy_queue;

#define QUEUE (floppy_queue)
#define CURRENT elv_next_request(floppy_queue)

/* Disk types: DD, HD, ED */
static struct atari_disk_type {
      const char  *name;
      unsigned    spt;        /* sectors per track */
      unsigned    blocks;           /* total number of blocks */
      unsigned    fdc_speed;  /* fdc_speed setting */
      unsigned    stretch;    /* track doubling ? */
} disk_type[] = {
      { "d360",  9, 720, 0, 0},     /*  0: 360kB diskette */
      { "D360",  9, 720, 0, 1},     /*  1: 360kb in 720k or 1.2MB drive */
      { "D720",  9,1440, 0, 0},     /*  2: 720kb in 720k or 1.2MB drive */
      { "D820", 10,1640, 0, 0},     /*  3: DD disk with 82 tracks/10 sectors */
/* formats above are probed for type DD */
#define     MAX_TYPE_DD 3
      { "h1200",15,2400, 3, 0},     /*  4: 1.2MB diskette */
      { "H1440",18,2880, 3, 0},     /*  5: 1.4 MB diskette (HD) */
      { "H1640",20,3280, 3, 0},     /*  6: 1.64MB diskette (fat HD) 82 tr 20 sec */
/* formats above are probed for types DD and HD */
#define     MAX_TYPE_HD 6
      { "E2880",36,5760, 3, 0},     /*  7: 2.8 MB diskette (ED) */
      { "E3280",40,6560, 3, 0},     /*  8: 3.2 MB diskette (fat ED) 82 tr 40 sec */
/* formats above are probed for types DD, HD and ED */
#define     MAX_TYPE_ED 8
/* types below are never autoprobed */
      { "H1680",21,3360, 3, 0},     /*  9: 1.68MB diskette (fat HD) 80 tr 21 sec */
      { "h410",10,820, 0, 1},       /* 10: 410k diskette 41 tr 10 sec, stretch */
      { "h1476",18,2952, 3, 0},     /* 11: 1.48MB diskette 82 tr 18 sec */
      { "H1722",21,3444, 3, 0},     /* 12: 1.72MB diskette 82 tr 21 sec */
      { "h420",10,840, 0, 1},       /* 13: 420k diskette 42 tr 10 sec, stretch */
      { "H830",10,1660, 0, 0},      /* 14: 820k diskette 83 tr 10 sec */
      { "h1494",18,2952, 3, 0},     /* 15: 1.49MB diskette 83 tr 18 sec */
      { "H1743",21,3486, 3, 0},     /* 16: 1.74MB diskette 83 tr 21 sec */
      { "h880",11,1760, 0, 0},      /* 17: 880k diskette 80 tr 11 sec */
      { "D1040",13,2080, 0, 0},     /* 18: 1.04MB diskette 80 tr 13 sec */
      { "D1120",14,2240, 0, 0},     /* 19: 1.12MB diskette 80 tr 14 sec */
      { "h1600",20,3200, 3, 0},     /* 20: 1.60MB diskette 80 tr 20 sec */
      { "H1760",22,3520, 3, 0},     /* 21: 1.76MB diskette 80 tr 22 sec */
      { "H1920",24,3840, 3, 0},     /* 22: 1.92MB diskette 80 tr 24 sec */
      { "E3200",40,6400, 3, 0},     /* 23: 3.2MB diskette 80 tr 40 sec */
      { "E3520",44,7040, 3, 0},     /* 24: 3.52MB diskette 80 tr 44 sec */
      { "E3840",48,7680, 3, 0},     /* 25: 3.84MB diskette 80 tr 48 sec */
      { "H1840",23,3680, 3, 0},     /* 26: 1.84MB diskette 80 tr 23 sec */
      { "D800",10,1600, 0, 0},      /* 27: 800k diskette 80 tr 10 sec */
};

static int StartDiskType[] = {
      MAX_TYPE_DD,
      MAX_TYPE_HD,
      MAX_TYPE_ED
};

#define     TYPE_DD           0
#define     TYPE_HD           1
#define     TYPE_ED           2

static int DriveType = TYPE_HD;

static DEFINE_SPINLOCK(ataflop_lock);

/* Array for translating minors into disk formats */
static struct {
      int    index;
      unsigned drive_types;
} minor2disktype[] = {
      {  0, TYPE_DD },  /*  1: d360 */
      {  4, TYPE_HD },  /*  2: h1200 */
      {  1, TYPE_DD },  /*  3: D360 */
      {  2, TYPE_DD },  /*  4: D720 */
      {  1, TYPE_DD },  /*  5: h360 = D360 */
      {  2, TYPE_DD },  /*  6: h720 = D720 */
      {  5, TYPE_HD },  /*  7: H1440 */
      {  7, TYPE_ED },  /*  8: E2880 */
/* some PC formats :-) */
      {  8, TYPE_ED },  /*  9: E3280    <- was "CompaQ" == E2880 for PC */
      {  5, TYPE_HD },  /* 10: h1440 = H1440 */
      {  9, TYPE_HD },  /* 11: H1680 */
      { 10, TYPE_DD },  /* 12: h410  */
      {  3, TYPE_DD },  /* 13: H820     <- == D820, 82x10 */
      { 11, TYPE_HD },  /* 14: h1476 */
      { 12, TYPE_HD },  /* 15: H1722 */
      { 13, TYPE_DD },  /* 16: h420  */
      { 14, TYPE_DD },  /* 17: H830  */
      { 15, TYPE_HD },  /* 18: h1494 */
      { 16, TYPE_HD },  /* 19: H1743 */
      { 17, TYPE_DD },  /* 20: h880  */
      { 18, TYPE_DD },  /* 21: D1040 */
      { 19, TYPE_DD },  /* 22: D1120 */
      { 20, TYPE_HD },  /* 23: h1600 */
      { 21, TYPE_HD },  /* 24: H1760 */
      { 22, TYPE_HD },  /* 25: H1920 */
      { 23, TYPE_ED },  /* 26: E3200 */
      { 24, TYPE_ED },  /* 27: E3520 */
      { 25, TYPE_ED },  /* 28: E3840 */
      { 26, TYPE_HD },  /* 29: H1840 */
      { 27, TYPE_DD },  /* 30: D800  */
      {  6, TYPE_HD },  /* 31: H1640    <- was H1600 == h1600 for PC */
};

#define NUM_DISK_MINORS ARRAY_SIZE(minor2disktype)

/*
 * Maximum disk size (in kilobytes). This default is used whenever the
 * current disk size is unknown.
 */
#define MAX_DISK_SIZE 3280

/*
 * MSch: User-provided type information. 'drive' points to
 * the respective entry of this array. Set by FDSETPRM ioctls.
 */
static struct atari_disk_type user_params[FD_MAX_UNITS];

/*
 * User-provided permanent type information. 'drive' points to
 * the respective entry of this array.  Set by FDDEFPRM ioctls, 
 * restored upon disk change by floppy_revalidate() if valid (as seen by
 * default_params[].blocks > 0 - a bit in unit[].flags might be used for this?)
 */
static struct atari_disk_type default_params[FD_MAX_UNITS];

/* current info on each unit */
static struct atari_floppy_struct {
      int connected;                      /* !=0 : drive is connected */
      int autoprobe;                      /* !=0 : do autoprobe       */

      struct atari_disk_type  *disktype;  /* current type of disk */

      int track;        /* current head position or -1 if
                           unknown */
      unsigned int steprate;  /* steprate setting */
      unsigned int wpstat;    /* current state of WP signal (for
                           disk change detection) */
      int flags;        /* flags */
      struct gendisk *disk;
      int ref;
      int type;
} unit[FD_MAX_UNITS];

#define     UD    unit[drive]
#define     UDT   unit[drive].disktype
#define     SUD   unit[SelectedDrive]
#define     SUDT  unit[SelectedDrive].disktype


#define FDC_READ(reg) ({                  \
    /* unsigned long __flags; */          \
    unsigned short __val;                 \
    /* local_irq_save(__flags); */        \
    dma_wd.dma_mode_status = 0x80 | (reg);      \
    udelay(25);                           \
    __val = dma_wd.fdc_acces_seccount;          \
    MFPDELAY();                           \
    /* local_irq_restore(__flags); */           \
    __val & 0xff;                   \
})

#define FDC_WRITE(reg,val)                \
    do {                            \
      /* unsigned long __flags; */        \
      /* local_irq_save(__flags); */            \
      dma_wd.dma_mode_status = 0x80 | (reg);    \
      udelay(25);                   \
      dma_wd.fdc_acces_seccount = (val);  \
      MFPDELAY();                   \
        /* local_irq_restore(__flags); */ \
    } while(0)


/* Buffering variables:
 * First, there is a DMA buffer in ST-RAM that is used for floppy DMA
 * operations. Second, a track buffer is used to cache a whole track
 * of the disk to save read operations. These are two separate buffers
 * because that allows write operations without clearing the track buffer.
 */

static int MaxSectors[] = {
      11, 22, 44
};
static int BufferSize[] = {
      15*512, 30*512, 60*512
};

#define     BUFFER_SIZE (BufferSize[DriveType])

unsigned char *DMABuffer;                   /* buffer for writes */
static unsigned long PhysDMABuffer;   /* physical address */

static int UseTrackbuffer = -1;             /* Do track buffering? */
module_param(UseTrackbuffer, int, 0);

unsigned char *TrackBuffer;                 /* buffer for reads */
static unsigned long PhysTrackBuffer; /* physical address */
static int BufferDrive, BufferSide, BufferTrack;
static int read_track;        /* non-zero if we are reading whole tracks */

#define     SECTOR_BUFFER(sec)      (TrackBuffer + ((sec)-1)*512)
#define     IS_BUFFERED(drive,side,track) \
    (BufferDrive == (drive) && BufferSide == (side) && BufferTrack == (track))

/*
 * These are global variables, as that's the easiest way to give
 * information to interrupts. They are the data used for the current
 * request.
 */
static int SelectedDrive = 0;
static int ReqCmd, ReqBlock;
static int ReqSide, ReqTrack, ReqSector, ReqCnt;
static int HeadSettleFlag = 0;
static unsigned char *ReqData, *ReqBuffer;
static int MotorOn = 0, MotorOffTrys;
static int IsFormatting = 0, FormatError;

static int UserSteprate[FD_MAX_UNITS] = { -1, -1 };
module_param_array(UserSteprate, int, NULL, 0);

/* Synchronization of FDC access. */
static volatile int fdc_busy = 0;
static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
static DECLARE_WAIT_QUEUE_HEAD(format_wait);

static unsigned long changed_floppies = 0xff, fake_change = 0;
#define     CHECK_CHANGE_DELAY      HZ/2

#define     FD_MOTOR_OFF_DELAY      (3*HZ)
#define     FD_MOTOR_OFF_MAXTRY     (10*20)

#define FLOPPY_TIMEOUT        (6*HZ)
#define RECALIBRATE_ERRORS    4     /* After this many errors the drive
                               * will be recalibrated. */
#define MAX_ERRORS            8     /* After this many errors the driver
                               * will give up. */


/*
 * The driver is trying to determine the correct media format
 * while Probing is set. fd_rwsec_done() clears it after a
 * successful access.
 */
static int Probing = 0;

/* This flag is set when a dummy seek is necessary to make the WP
 * status bit accessible.
 */
static int NeedSeek = 0;


#ifdef DEBUG
#define DPRINT(a) printk a
#else
#define DPRINT(a)
#endif

/***************************** Prototypes *****************************/

static void fd_select_side( int side );
static void fd_select_drive( int drive );
static void fd_deselect( void );
static void fd_motor_off_timer( unsigned long dummy );
static void check_change( unsigned long dummy );
static irqreturn_t floppy_irq (int irq, void *dummy, struct pt_regs *fp);
static void fd_error( void );
static int do_format(int drive, int type, struct atari_format_descr *desc);
static void do_fd_action( int drive );
static void fd_calibrate( void );
static void fd_calibrate_done( int status );
static void fd_seek( void );
static void fd_seek_done( int status );
static void fd_rwsec( void );
static void fd_readtrack_check( unsigned long dummy );
static void fd_rwsec_done( int status );
static void fd_rwsec_done1(int status);
static void fd_writetrack( void );
static void fd_writetrack_done( int status );
static void fd_times_out( unsigned long dummy );
static void finish_fdc( void );
static void finish_fdc_done( int dummy );
static void setup_req_params( int drive );
static void redo_fd_request( void);
static int fd_ioctl( struct inode *inode, struct file *filp, unsigned int
                     cmd, unsigned long param);
static void fd_probe( int drive );
static int fd_test_drive_present( int drive );
static void config_types( void );
static int floppy_open( struct inode *inode, struct file *filp );
static int floppy_release( struct inode * inode, struct file * filp );

/************************* End of Prototypes **************************/

static DEFINE_TIMER(motor_off_timer, fd_motor_off_timer, 0, 0);
static DEFINE_TIMER(readtrack_timer, fd_readtrack_check, 0, 0);
static DEFINE_TIMER(timeout_timer, fd_times_out, 0, 0);
static DEFINE_TIMER(fd_timer, check_change, 0, 0);
      
static inline void start_motor_off_timer(void)
{
      mod_timer(&motor_off_timer, jiffies + FD_MOTOR_OFF_DELAY);
      MotorOffTrys = 0;
}

static inline void start_check_change_timer( void )
{
      mod_timer(&fd_timer, jiffies + CHECK_CHANGE_DELAY);
}

static inline void start_timeout(void)
{
      mod_timer(&timeout_timer, jiffies + FLOPPY_TIMEOUT);
}

static inline void stop_timeout(void)
{
      del_timer(&timeout_timer);
}

/* Select the side to use. */

static void fd_select_side( int side )
{
      unsigned long flags;

      /* protect against various other ints mucking around with the PSG */
      local_irq_save(flags);
  
      sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
      sound_ym.wd_data = (side == 0) ? sound_ym.rd_data_reg_sel | 0x01 :
                                       sound_ym.rd_data_reg_sel & 0xfe;

      local_irq_restore(flags);
}


/* Select a drive, update the FDC's track register and set the correct
 * clock speed for this disk's type.
 */

static void fd_select_drive( int drive )
{
      unsigned long flags;
      unsigned char tmp;
  
      if (drive == SelectedDrive)
        return;

      /* protect against various other ints mucking around with the PSG */
      local_irq_save(flags);
      sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
      tmp = sound_ym.rd_data_reg_sel;
      sound_ym.wd_data = (tmp | DSKDRVNONE) & ~(drive == 0 ? DSKDRV0 : DSKDRV1);
      atari_dont_touch_floppy_select = 1;
      local_irq_restore(flags);

      /* restore track register to saved value */
      FDC_WRITE( FDCREG_TRACK, UD.track );
      udelay(25);

      /* select 8/16 MHz */
      if (UDT)
            if (ATARIHW_PRESENT(FDCSPEED))
                  dma_wd.fdc_speed = UDT->fdc_speed;
      
      SelectedDrive = drive;
}


/* Deselect both drives. */

static void fd_deselect( void )
{
      unsigned long flags;

      /* protect against various other ints mucking around with the PSG */
      local_irq_save(flags);
      atari_dont_touch_floppy_select = 0;
      sound_ym.rd_data_reg_sel=14;  /* Select PSG Port A */
      sound_ym.wd_data = (sound_ym.rd_data_reg_sel |
                      (MACH_IS_FALCON ? 3 : 7)); /* no drives selected */
      /* On Falcon, the drive B select line is used on the printer port, so
       * leave it alone... */
      SelectedDrive = -1;
      local_irq_restore(flags);
}


/* This timer function deselects the drives when the FDC switched the
 * motor off. The deselection cannot happen earlier because the FDC
 * counts the index signals, which arrive only if one drive is selected.
 */

static void fd_motor_off_timer( unsigned long dummy )
{
      unsigned char status;

      if (SelectedDrive < 0)
            /* no drive selected, needn't deselect anyone */
            return;

      if (stdma_islocked())
            goto retry;

      status = FDC_READ( FDCREG_STATUS );

      if (!(status & 0x80)) {
            /* motor already turned off by FDC -> deselect drives */
            MotorOn = 0;
            fd_deselect();
            return;
      }
      /* not yet off, try again */

  retry:
      /* Test again later; if tested too often, it seems there is no disk
       * in the drive and the FDC will leave the motor on forever (or,
       * at least until a disk is inserted). So we'll test only twice
       * per second from then on...
       */
      mod_timer(&motor_off_timer,
              jiffies + (MotorOffTrys++ < FD_MOTOR_OFF_MAXTRY ? HZ/20 : HZ/2));
}


/* This function is repeatedly called to detect disk changes (as good
 * as possible) and keep track of the current state of the write protection.
 */

static void check_change( unsigned long dummy )
{
      static int    drive = 0;

      unsigned long flags;
      unsigned char old_porta;
      int                 stat;

      if (++drive > 1 || !UD.connected)
            drive = 0;

      /* protect against various other ints mucking around with the PSG */
      local_irq_save(flags);

      if (!stdma_islocked()) {
            sound_ym.rd_data_reg_sel = 14;
            old_porta = sound_ym.rd_data_reg_sel;
            sound_ym.wd_data = (old_porta | DSKDRVNONE) &
                                 ~(drive == 0 ? DSKDRV0 : DSKDRV1);
            stat = !!(FDC_READ( FDCREG_STATUS ) & FDCSTAT_WPROT);
            sound_ym.wd_data = old_porta;

            if (stat != UD.wpstat) {
                  DPRINT(( "wpstat[%d] = %d\n", drive, stat ));
                  UD.wpstat = stat;
                  set_bit (drive, &changed_floppies);
            }
      }
      local_irq_restore(flags);

      start_check_change_timer();
}

 
/* Handling of the Head Settling Flag: This flag should be set after each
 * seek operation, because we don't use seeks with verify.
 */

static inline void set_head_settle_flag(void)
{
      HeadSettleFlag = FDCCMDADD_E;
}

static inline int get_head_settle_flag(void)
{
      int   tmp = HeadSettleFlag;
      HeadSettleFlag = 0;
      return( tmp );
}

static inline void copy_buffer(void *from, void *to)
{
      ulong *p1 = (ulong *)from, *p2 = (ulong *)to;
      int cnt;

      for (cnt = 512/4; cnt; cnt--)
            *p2++ = *p1++;
}

  
  

/* General Interrupt Handling */

static void (*FloppyIRQHandler)( int status ) = NULL;

static irqreturn_t floppy_irq (int irq, void *dummy, struct pt_regs *fp)
{
      unsigned char status;
      void (*handler)( int );

      handler = xchg(&FloppyIRQHandler, NULL);

      if (handler) {
            nop();
            status = FDC_READ( FDCREG_STATUS );
            DPRINT(("FDC irq, status = %02x handler = %08lx\n",status,(unsigned long)handler));
            handler( status );
      }
      else {
            DPRINT(("FDC irq, no handler\n"));
      }
      return IRQ_HANDLED;
}


/* Error handling: If some error happened, retry some times, then
 * recalibrate, then try again, and fail after MAX_ERRORS.
 */

static void fd_error( void )
{
      if (IsFormatting) {
            IsFormatting = 0;
            FormatError = 1;
            wake_up( &format_wait );
            return;
      }

      if (!CURRENT)
            return;

      CURRENT->errors++;
      if (CURRENT->errors >= MAX_ERRORS) {
            printk(KERN_ERR "fd%d: too many errors.\n", SelectedDrive );
            end_request(CURRENT, 0);
      }
      else if (CURRENT->errors == RECALIBRATE_ERRORS) {
            printk(KERN_WARNING "fd%d: recalibrating\n", SelectedDrive );
            if (SelectedDrive != -1)
                  SUD.track = -1;
      }
      redo_fd_request();
}



#define     SET_IRQ_HANDLER(proc) do { FloppyIRQHandler = (proc); } while(0)


/* ---------- Formatting ---------- */

#define FILL(n,val)           \
    do {                \
      memset( p, val, n );    \
      p += n;                 \
    } while(0)

static int do_format(int drive, int type, struct atari_format_descr *desc)
{
      unsigned char     *p;
      int sect, nsect;
      unsigned long     flags;

      DPRINT(("do_format( dr=%d tr=%d he=%d offs=%d )\n",
            drive, desc->track, desc->head, desc->sect_offset ));

      local_irq_save(flags);
      while( fdc_busy ) sleep_on( &fdc_wait );
      fdc_busy = 1;
      stdma_lock(floppy_irq, NULL);
      atari_turnon_irq( IRQ_MFP_FDC ); /* should be already, just to be sure */
      local_irq_restore(flags);

      if (type) {
            if (--type >= NUM_DISK_MINORS ||
                minor2disktype[type].drive_types > DriveType) {
                  redo_fd_request();
                  return -EINVAL;
            }
            type = minor2disktype[type].index;
            UDT = &disk_type[type];
      }

      if (!UDT || desc->track >= UDT->blocks/UDT->spt/2 || desc->head >= 2) {
            redo_fd_request();
            return -EINVAL;
      }

      nsect = UDT->spt;
      p = TrackBuffer;
      /* The track buffer is used for the raw track data, so its
         contents become invalid! */
      BufferDrive = -1;
      /* stop deselect timer */
      del_timer( &motor_off_timer );

      FILL( 60 * (nsect / 9), 0x4e );
      for( sect = 0; sect < nsect; ++sect ) {
            FILL( 12, 0 );
            FILL( 3, 0xf5 );
            *p++ = 0xfe;
            *p++ = desc->track;
            *p++ = desc->head;
            *p++ = (nsect + sect - desc->sect_offset) % nsect + 1;
            *p++ = 2;
            *p++ = 0xf7;
            FILL( 22, 0x4e );
            FILL( 12, 0 );
            FILL( 3, 0xf5 );
            *p++ = 0xfb;
            FILL( 512, 0xe5 );
            *p++ = 0xf7;
            FILL( 40, 0x4e );
      }
      FILL( TrackBuffer+BUFFER_SIZE-p, 0x4e );

      IsFormatting = 1;
      FormatError = 0;
      ReqTrack = desc->track;
      ReqSide  = desc->head;
      do_fd_action( drive );

      sleep_on( &format_wait );

      redo_fd_request();
      return( FormatError ? -EIO : 0 );   
}


/* do_fd_action() is the general procedure for a fd request: All
 * required parameter settings (drive select, side select, track
 * position) are checked and set if needed. For each of these
 * parameters and the actual reading or writing exist two functions:
 * one that starts the setting (or skips it if possible) and one
 * callback for the "done" interrupt. Each done func calls the next
 * set function to propagate the request down to fd_rwsec_done().
 */

static void do_fd_action( int drive )
{
      DPRINT(("do_fd_action\n"));
      
      if (UseTrackbuffer && !IsFormatting) {
      repeat:
          if (IS_BUFFERED( drive, ReqSide, ReqTrack )) {
            if (ReqCmd == READ) {
                copy_buffer( SECTOR_BUFFER(ReqSector), ReqData );
                if (++ReqCnt < CURRENT->current_nr_sectors) {
                  /* read next sector */
                  setup_req_params( drive );
                  goto repeat;
                }
                else {
                  /* all sectors finished */
                  CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
                  CURRENT->sector += CURRENT->current_nr_sectors;
                  end_request(CURRENT, 1);
                  redo_fd_request();
                  return;
                }
            }
            else {
                /* cmd == WRITE, pay attention to track buffer
                 * consistency! */
                copy_buffer( ReqData, SECTOR_BUFFER(ReqSector) );
            }
          }
      }

      if (SelectedDrive != drive)
            fd_select_drive( drive );
    
      if (UD.track == -1)
            fd_calibrate();
      else if (UD.track != ReqTrack << UDT->stretch)
            fd_seek();
      else if (IsFormatting)
            fd_writetrack();
      else
            fd_rwsec();
}


/* Seek to track 0 if the current track is unknown */

static void fd_calibrate( void )
{
      if (SUD.track >= 0) {
            fd_calibrate_done( 0 );
            return;
      }

      if (ATARIHW_PRESENT(FDCSPEED))
            dma_wd.fdc_speed = 0;   /* always seek with 8 Mhz */;
      DPRINT(("fd_calibrate\n"));
      SET_IRQ_HANDLER( fd_calibrate_done );
      /* we can't verify, since the speed may be incorrect */
      FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | SUD.steprate );

      NeedSeek = 1;
      MotorOn = 1;
      start_timeout();
      /* wait for IRQ */
}


static void fd_calibrate_done( int status )
{
      DPRINT(("fd_calibrate_done()\n"));
      stop_timeout();
    
      /* set the correct speed now */
      if (ATARIHW_PRESENT(FDCSPEED))
            dma_wd.fdc_speed = SUDT->fdc_speed;
      if (status & FDCSTAT_RECNF) {
            printk(KERN_ERR "fd%d: restore failed\n", SelectedDrive );
            fd_error();
      }
      else {
            SUD.track = 0;
            fd_seek();
      }
}
  
  
/* Seek the drive to the requested track. The drive must have been
 * calibrated at some point before this.
 */
  
static void fd_seek( void )
{
      if (SUD.track == ReqTrack << SUDT->stretch) {
            fd_seek_done( 0 );
            return;
      }

      if (ATARIHW_PRESENT(FDCSPEED)) {
            dma_wd.fdc_speed = 0;   /* always seek witch 8 Mhz */
            MFPDELAY();
      }

      DPRINT(("fd_seek() to track %d\n",ReqTrack));
      FDC_WRITE( FDCREG_DATA, ReqTrack << SUDT->stretch);
      udelay(25);
      SET_IRQ_HANDLER( fd_seek_done );
      FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK | SUD.steprate );

      MotorOn = 1;
      set_head_settle_flag();
      start_timeout();
      /* wait for IRQ */
}


static void fd_seek_done( int status )
{
      DPRINT(("fd_seek_done()\n"));
      stop_timeout();
      
      /* set the correct speed */
      if (ATARIHW_PRESENT(FDCSPEED))
            dma_wd.fdc_speed = SUDT->fdc_speed;
      if (status & FDCSTAT_RECNF) {
            printk(KERN_ERR "fd%d: seek error (to track %d)\n",
                        SelectedDrive, ReqTrack );
            /* we don't know exactly which track we are on now! */
            SUD.track = -1;
            fd_error();
      }
      else {
            SUD.track = ReqTrack << SUDT->stretch;
            NeedSeek = 0;
            if (IsFormatting)
                  fd_writetrack();
            else
                  fd_rwsec();
      }
}


/* This does the actual reading/writing after positioning the head
 * over the correct track.
 */

static int MultReadInProgress = 0;


static void fd_rwsec( void )
{
      unsigned long paddr, flags;
      unsigned int  rwflag, old_motoron;
      unsigned int track;
      
      DPRINT(("fd_rwsec(), Sec=%d, Access=%c\n",ReqSector, ReqCmd == WRITE ? 'w' : 'r' ));
      if (ReqCmd == WRITE) {
            if (ATARIHW_PRESENT(EXTD_DMA)) {
                  paddr = virt_to_phys(ReqData);
            }
            else {
                  copy_buffer( ReqData, DMABuffer );
                  paddr = PhysDMABuffer;
            }
            dma_cache_maintenance( paddr, 512, 1 );
            rwflag = 0x100;
      }
      else {
            if (read_track)
                  paddr = PhysTrackBuffer;
            else
                  paddr = ATARIHW_PRESENT(EXTD_DMA) ? 
                        virt_to_phys(ReqData) : PhysDMABuffer;
            rwflag = 0;
      }

      fd_select_side( ReqSide );
  
      /* Start sector of this operation */
      FDC_WRITE( FDCREG_SECTOR, read_track ? 1 : ReqSector );
      MFPDELAY();
      /* Cheat for track if stretch != 0 */
      if (SUDT->stretch) {
            track = FDC_READ( FDCREG_TRACK);
            MFPDELAY();
            FDC_WRITE( FDCREG_TRACK, track >> SUDT->stretch);
      }
      udelay(25);
  
      /* Setup DMA */
      local_irq_save(flags);
      dma_wd.dma_lo = (unsigned char)paddr;
      MFPDELAY();
      paddr >>= 8;
      dma_wd.dma_md = (unsigned char)paddr;
      MFPDELAY();
      paddr >>= 8;
      if (ATARIHW_PRESENT(EXTD_DMA))
            st_dma_ext_dmahi = (unsigned short)paddr;
      else
            dma_wd.dma_hi = (unsigned char)paddr;
      MFPDELAY();
      local_irq_restore(flags);
  
      /* Clear FIFO and switch DMA to correct mode */  
      dma_wd.dma_mode_status = 0x90 | rwflag;  
      MFPDELAY();
      dma_wd.dma_mode_status = 0x90 | (rwflag ^ 0x100);  
      MFPDELAY();
      dma_wd.dma_mode_status = 0x90 | rwflag;
      MFPDELAY();
  
      /* How many sectors for DMA */
      dma_wd.fdc_acces_seccount = read_track ? SUDT->spt : 1;
  
      udelay(25);  
  
      /* Start operation */
      dma_wd.dma_mode_status = FDCSELREG_STP | rwflag;
      udelay(25);
      SET_IRQ_HANDLER( fd_rwsec_done );
      dma_wd.fdc_acces_seccount =
        (get_head_settle_flag() |
         (rwflag ? FDCCMD_WRSEC : (FDCCMD_RDSEC | (read_track ? FDCCMDADD_M : 0))));

      old_motoron = MotorOn;
      MotorOn = 1;
      NeedSeek = 1;
      /* wait for interrupt */

      if (read_track) {
            /* If reading a whole track, wait about one disk rotation and
             * then check if all sectors are read. The FDC will even
             * search for the first non-existent sector and need 1 sec to
             * recognise that it isn't present :-(
             */
            MultReadInProgress = 1;
            mod_timer(&readtrack_timer,
                    /* 1 rot. + 5 rot.s if motor was off  */
                    jiffies + HZ/5 + (old_motoron ? 0 : HZ));
      }
      start_timeout();
}

    
static void fd_readtrack_check( unsigned long dummy )
{
      unsigned long flags, addr, addr2;

      local_irq_save(flags);

      if (!MultReadInProgress) {
            /* This prevents a race condition that could arise if the
             * interrupt is triggered while the calling of this timer
             * callback function takes place. The IRQ function then has
             * already cleared 'MultReadInProgress'  when flow of control
             * gets here.
             */
            local_irq_restore(flags);
            return;
      }

      /* get the current DMA address */
      /* ++ f.a. read twice to avoid being fooled by switcher */
      addr = 0;
      do {
            addr2 = addr;
            addr = dma_wd.dma_lo & 0xff;
            MFPDELAY();
            addr |= (dma_wd.dma_md & 0xff) << 8;
            MFPDELAY();
            if (ATARIHW_PRESENT( EXTD_DMA ))
                  addr |= (st_dma_ext_dmahi & 0xffff) << 16;
            else
                  addr |= (dma_wd.dma_hi & 0xff) << 16;
            MFPDELAY();
      } while(addr != addr2);
  
      if (addr >= PhysTrackBuffer + SUDT->spt*512) {
            /* already read enough data, force an FDC interrupt to stop
             * the read operation
             */
            SET_IRQ_HANDLER( NULL );
            MultReadInProgress = 0;
            local_irq_restore(flags);
            DPRINT(("fd_readtrack_check(): done\n"));
            FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
            udelay(25);

            /* No error until now -- the FDC would have interrupted
             * otherwise!
             */
            fd_rwsec_done1(0);
      }
      else {
            /* not yet finished, wait another tenth rotation */
            local_irq_restore(flags);
            DPRINT(("fd_readtrack_check(): not yet finished\n"));
            mod_timer(&readtrack_timer, jiffies + HZ/5/10);
      }
}


static void fd_rwsec_done( int status )
{
      DPRINT(("fd_rwsec_done()\n"));

      if (read_track) {
            del_timer(&readtrack_timer);
            if (!MultReadInProgress)
                  return;
            MultReadInProgress = 0;
      }
      fd_rwsec_done1(status);
}

static void fd_rwsec_done1(int status)
{
      unsigned int track;

      stop_timeout();
      
      /* Correct the track if stretch != 0 */
      if (SUDT->stretch) {
            track = FDC_READ( FDCREG_TRACK);
            MFPDELAY();
            FDC_WRITE( FDCREG_TRACK, track << SUDT->stretch);
      }

      if (!UseTrackbuffer) {
            dma_wd.dma_mode_status = 0x90;
            MFPDELAY();
            if (!(dma_wd.dma_mode_status & 0x01)) {
                  printk(KERN_ERR "fd%d: DMA error\n", SelectedDrive );
                  goto err_end;
            }
      }
      MFPDELAY();

      if (ReqCmd == WRITE && (status & FDCSTAT_WPROT)) {
            printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive );
            goto err_end;
      }     
      if ((status & FDCSTAT_RECNF) &&
          /* RECNF is no error after a multiple read when the FDC
             searched for a non-existent sector! */
          !(read_track && FDC_READ(FDCREG_SECTOR) > SUDT->spt)) {
            if (Probing) {
                  if (SUDT > disk_type) {
                      if (SUDT[-1].blocks > ReqBlock) {
                        /* try another disk type */
                        SUDT--;
                        set_capacity(unit[SelectedDrive].disk,
                                          SUDT->blocks);
                      } else
                        Probing = 0;
                  }
                  else {
                        if (SUD.flags & FTD_MSG)
                              printk(KERN_INFO "fd%d: Auto-detected floppy type %s\n",
                                     SelectedDrive, SUDT->name );
                        Probing=0;
                  }
            } else {    
/* record not found, but not probing. Maybe stretch wrong ? Restart probing */
                  if (SUD.autoprobe) {
                        SUDT = disk_type + StartDiskType[DriveType];
                        set_capacity(unit[SelectedDrive].disk,
                                          SUDT->blocks);
                        Probing = 1;
                  }
            }
            if (Probing) {
                  if (ATARIHW_PRESENT(FDCSPEED)) {
                        dma_wd.fdc_speed = SUDT->fdc_speed;
                        MFPDELAY();
                  }
                  setup_req_params( SelectedDrive );
                  BufferDrive = -1;
                  do_fd_action( SelectedDrive );
                  return;
            }

            printk(KERN_ERR "fd%d: sector %d not found (side %d, track %d)\n",
                   SelectedDrive, FDC_READ (FDCREG_SECTOR), ReqSide, ReqTrack );
            goto err_end;
      }
      if (status & FDCSTAT_CRC) {
            printk(KERN_ERR "fd%d: CRC error (side %d, track %d, sector %d)\n",
                   SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) );
            goto err_end;
      }
      if (status & FDCSTAT_LOST) {
            printk(KERN_ERR "fd%d: lost data (side %d, track %d, sector %d)\n",
                   SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) );
            goto err_end;
      }

      Probing = 0;
      
      if (ReqCmd == READ) {
            if (!read_track) {
                  void *addr;
                  addr = ATARIHW_PRESENT( EXTD_DMA ) ? ReqData : DMABuffer;
                  dma_cache_maintenance( virt_to_phys(addr), 512, 0 );
                  if (!ATARIHW_PRESENT( EXTD_DMA ))
                        copy_buffer (addr, ReqData);
            } else {
                  dma_cache_maintenance( PhysTrackBuffer, MaxSectors[DriveType] * 512, 0 );
                  BufferDrive = SelectedDrive;
                  BufferSide  = ReqSide;
                  BufferTrack = ReqTrack;
                  copy_buffer (SECTOR_BUFFER (ReqSector), ReqData);
            }
      }
  
      if (++ReqCnt < CURRENT->current_nr_sectors) {
            /* read next sector */
            setup_req_params( SelectedDrive );
            do_fd_action( SelectedDrive );
      }
      else {
            /* all sectors finished */
            CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
            CURRENT->sector += CURRENT->current_nr_sectors;
            end_request(CURRENT, 1);
            redo_fd_request();
      }
      return;
  
  err_end:
      BufferDrive = -1;
      fd_error();
}


static void fd_writetrack( void )
{
      unsigned long paddr, flags;
      unsigned int track;
      
      DPRINT(("fd_writetrack() Tr=%d Si=%d\n", ReqTrack, ReqSide ));

      paddr = PhysTrackBuffer;
      dma_cache_maintenance( paddr, BUFFER_SIZE, 1 );

      fd_select_side( ReqSide );
  
      /* Cheat for track if stretch != 0 */
      if (SUDT->stretch) {
            track = FDC_READ( FDCREG_TRACK);
            MFPDELAY();
            FDC_WRITE(FDCREG_TRACK,track >> SUDT->stretch);
      }
      udelay(40);
  
      /* Setup DMA */
      local_irq_save(flags);
      dma_wd.dma_lo = (unsigned char)paddr;
      MFPDELAY();
      paddr >>= 8;
      dma_wd.dma_md = (unsigned char)paddr;
      MFPDELAY();
      paddr >>= 8;
      if (ATARIHW_PRESENT( EXTD_DMA ))
            st_dma_ext_dmahi = (unsigned short)paddr;
      else
            dma_wd.dma_hi = (unsigned char)paddr;
      MFPDELAY();
      local_irq_restore(flags);
  
      /* Clear FIFO and switch DMA to correct mode */  
      dma_wd.dma_mode_status = 0x190;  
      MFPDELAY();
      dma_wd.dma_mode_status = 0x90;  
      MFPDELAY();
      dma_wd.dma_mode_status = 0x190;
      MFPDELAY();
  
      /* How many sectors for DMA */
      dma_wd.fdc_acces_seccount = BUFFER_SIZE/512;
      udelay(40);  
  
      /* Start operation */
      dma_wd.dma_mode_status = FDCSELREG_STP | 0x100;
      udelay(40);
      SET_IRQ_HANDLER( fd_writetrack_done );
      dma_wd.fdc_acces_seccount = FDCCMD_WRTRA | get_head_settle_flag(); 

      MotorOn = 1;
      start_timeout();
      /* wait for interrupt */
}


static void fd_writetrack_done( int status )
{
      DPRINT(("fd_writetrack_done()\n"));

      stop_timeout();

      if (status & FDCSTAT_WPROT) {
            printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive );
            goto err_end;
      }     
      if (status & FDCSTAT_LOST) {
            printk(KERN_ERR "fd%d: lost data (side %d, track %d)\n",
                        SelectedDrive, ReqSide, ReqTrack );
            goto err_end;
      }

      wake_up( &format_wait );
      return;

  err_end:
      fd_error();
}

static void fd_times_out( unsigned long dummy )
{
      atari_disable_irq( IRQ_MFP_FDC );
      if (!FloppyIRQHandler) goto end; /* int occurred after timer was fired, but
                                * before we came here... */

      SET_IRQ_HANDLER( NULL );
      /* If the timeout occurred while the readtrack_check timer was
       * active, we need to cancel it, else bad things will happen */
      if (UseTrackbuffer)
            del_timer( &readtrack_timer );
      FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
      udelay( 25 );
      
      printk(KERN_ERR "floppy timeout\n" );
      fd_error();
  end:
      atari_enable_irq( IRQ_MFP_FDC );
}


/* The (noop) seek operation here is needed to make the WP bit in the
 * FDC status register accessible for check_change. If the last disk
 * operation would have been a RDSEC, this bit would always read as 0
 * no matter what :-( To save time, the seek goes to the track we're
 * already on.
 */

static void finish_fdc( void )
{
      if (!NeedSeek) {
            finish_fdc_done( 0 );
      }
      else {
            DPRINT(("finish_fdc: dummy seek started\n"));
            FDC_WRITE (FDCREG_DATA, SUD.track);
            SET_IRQ_HANDLER( finish_fdc_done );
            FDC_WRITE (FDCREG_CMD, FDCCMD_SEEK);
            MotorOn = 1;
            start_timeout();
            /* we must wait for the IRQ here, because the ST-DMA
               is released immediately afterwards and the interrupt
               may be delivered to the wrong driver. */
        }
}


static void finish_fdc_done( int dummy )
{
      unsigned long flags;

      DPRINT(("finish_fdc_done entered\n"));
      stop_timeout();
      NeedSeek = 0;

      if (timer_pending(&fd_timer) && time_before(fd_timer.expires, jiffies + 5))
            /* If the check for a disk change is done too early after this
             * last seek command, the WP bit still reads wrong :-((
             */
            mod_timer(&fd_timer, jiffies + 5);
      else
            start_check_change_timer();
      start_motor_off_timer();

      local_irq_save(flags);
      stdma_release();
      fdc_busy = 0;
      wake_up( &fdc_wait );
      local_irq_restore(flags);

      DPRINT(("finish_fdc() finished\n"));
}

/* The detection of disk changes is a dark chapter in Atari history :-(
 * Because the "Drive ready" signal isn't present in the Atari
 * hardware, one has to rely on the "Write Protect". This works fine,
 * as long as no write protected disks are used. TOS solves this
 * problem by introducing tri-state logic ("maybe changed") and
 * looking at the serial number in block 0. This isn't possible for
 * Linux, since the floppy driver can't make assumptions about the
 * filesystem used on the disk and thus the contents of block 0. I've
 * chosen the method to always say "The disk was changed" if it is
 * unsure whether it was. This implies that every open or mount
 * invalidates the disk buffers if you work with write protected
 * disks. But at least this is better than working with incorrect data
 * due to unrecognised disk changes.
 */

static int check_floppy_change(struct gendisk *disk)
{
      struct atari_floppy_struct *p = disk->private_data;
      unsigned int drive = p - unit;
      if (test_bit (drive, &fake_change)) {
            /* simulated change (e.g. after formatting) */
            return 1;
      }
      if (test_bit (drive, &changed_floppies)) {
            /* surely changed (the WP signal changed at least once) */
            return 1;
      }
      if (UD.wpstat) {
            /* WP is on -> could be changed: to be sure, buffers should be
             * invalidated...
             */
            return 1;
      }

      return 0;
}

static int floppy_revalidate(struct gendisk *disk)
{
      struct atari_floppy_struct *p = disk->private_data;
      unsigned int drive = p - unit;

      if (test_bit(drive, &changed_floppies) ||
          test_bit(drive, &fake_change) ||
          p->disktype == 0) {
            if (UD.flags & FTD_MSG)
                  printk(KERN_ERR "floppy: clear format %p!\n", UDT);
            BufferDrive = -1;
            clear_bit(drive, &fake_change);
            clear_bit(drive, &changed_floppies);
            /* MSch: clearing geometry makes sense only for autoprobe
               formats, for 'permanent user-defined' parameter:
               restore default_params[] here if flagged valid! */
            if (default_params[drive].blocks == 0)
                  UDT = NULL;
            else
                  UDT = &default_params[drive];
      }
      return 0;
}


/* This sets up the global variables describing the current request. */

static void setup_req_params( int drive )
{
      int block = ReqBlock + ReqCnt;

      ReqTrack = block / UDT->spt;
      ReqSector = block - ReqTrack * UDT->spt + 1;
      ReqSide = ReqTrack & 1;
      ReqTrack >>= 1;
      ReqData = ReqBuffer + 512 * ReqCnt;

      if (UseTrackbuffer)
            read_track = (ReqCmd == READ && CURRENT->errors == 0);
      else
            read_track = 0;

      DPRINT(("Request params: Si=%d Tr=%d Se=%d Data=%08lx\n",ReqSide,
                  ReqTrack, ReqSector, (unsigned long)ReqData ));
}


static void redo_fd_request(void)
{
      int drive, type;
      struct atari_floppy_struct *floppy;

      DPRINT(("redo_fd_request: CURRENT=%p dev=%s CURRENT->sector=%ld\n",
            CURRENT, CURRENT ? CURRENT->rq_disk->disk_name : "",
            CURRENT ? CURRENT->sector : 0 ));

      IsFormatting = 0;

repeat:

      if (!CURRENT)
            goto the_end;

      floppy = CURRENT->rq_disk->private_data;
      drive = floppy - unit;
      type = floppy->type;
      
      if (!UD.connected) {
            /* drive not connected */
            printk(KERN_ERR "Unknown Device: fd%d\n", drive );
            end_request(CURRENT, 0);
            goto repeat;
      }
            
      if (type == 0) {
            if (!UDT) {
                  Probing = 1;
                  UDT = disk_type + StartDiskType[DriveType];
                  set_capacity(floppy->disk, UDT->blocks);
                  UD.autoprobe = 1;
            }
      } 
      else {
            /* user supplied disk type */
            if (--type >= NUM_DISK_MINORS) {
                  printk(KERN_WARNING "fd%d: invalid disk format", drive );
                  end_request(CURRENT, 0);
                  goto repeat;
            }
            if (minor2disktype[type].drive_types > DriveType)  {
                  printk(KERN_WARNING "fd%d: unsupported disk format", drive );
                  end_request(CURRENT, 0);
                  goto repeat;
            }
            type = minor2disktype[type].index;
            UDT = &disk_type[type];
            set_capacity(floppy->disk, UDT->blocks);
            UD.autoprobe = 0;
      }
      
      if (CURRENT->sector + 1 > UDT->blocks) {
            end_request(CURRENT, 0);
            goto repeat;
      }

      /* stop deselect timer */
      del_timer( &motor_off_timer );
            
      ReqCnt = 0;
      ReqCmd = rq_data_dir(CURRENT);
      ReqBlock = CURRENT->sector;
      ReqBuffer = CURRENT->buffer;
      setup_req_params( drive );
      do_fd_action( drive );

      return;

  the_end:
      finish_fdc();
}


void do_fd_request(request_queue_t * q)
{
      unsigned long flags;

      DPRINT(("do_fd_request for pid %d\n",current->pid));
      while( fdc_busy ) sleep_on( &fdc_wait );
      fdc_busy = 1;
      stdma_lock(floppy_irq, NULL);

      atari_disable_irq( IRQ_MFP_FDC );
      local_save_flags(flags);      /* The request function is called with ints
      local_irq_disable();           * disabled... so must save the IPL for later */ 
      redo_fd_request();
      local_irq_restore(flags);
      atari_enable_irq( IRQ_MFP_FDC );
}

static int fd_ioctl(struct inode *inode, struct file *filp,
                unsigned int cmd, unsigned long param)
{
      struct gendisk *disk = inode->i_bdev->bd_disk;
      struct atari_floppy_struct *floppy = disk->private_data;
      int drive = floppy - unit;
      int type = floppy->type;
      struct atari_format_descr fmt_desc;
      struct atari_disk_type *dtp;
      struct floppy_struct getprm;
      int settype;
      struct floppy_struct setprm;
      void __user *argp = (void __user *)param;

      switch (cmd) {
      case FDGETPRM:
            if (type) {
                  if (--type >= NUM_DISK_MINORS)
                        return -ENODEV;
                  if (minor2disktype[type].drive_types > DriveType)
                        return -ENODEV;
                  type = minor2disktype[type].index;
                  dtp = &disk_type[type];
                  if (UD.flags & FTD_MSG)
                      printk (KERN_ERR "floppy%d: found dtp %p name %s!\n",
                          drive, dtp, dtp->name);
            }
            else {
                  if (!UDT)
                        return -ENXIO;
                  else
                        dtp = UDT;
            }
            memset((void *)&getprm, 0, sizeof(getprm));
            getprm.size = dtp->blocks;
            getprm.sect = dtp->spt;
            getprm.head = 2;
            getprm.track = dtp->blocks/dtp->spt/2;
            getprm.stretch = dtp->stretch;
            if (copy_to_user(argp, &getprm, sizeof(getprm)))
                  return -EFAULT;
            return 0;
      }
      switch (cmd) {
      case FDSETPRM:
      case FDDEFPRM:
              /* 
             * MSch 7/96: simple 'set geometry' case: just set the
             * 'default' device params (minor == 0).
             * Currently, the drive geometry is cleared after each
             * disk change and subsequent revalidate()! simple
             * implementation of FDDEFPRM: save geometry from a
             * FDDEFPRM call and restore it in floppy_revalidate() !
             */

            /* get the parameters from user space */
            if (floppy->ref != 1 && floppy->ref != -1)
                  return -EBUSY;
            if (copy_from_user(&setprm, argp, sizeof(setprm)))
                  return -EFAULT;
            /* 
             * first of all: check for floppy change and revalidate, 
             * or the next access will revalidate - and clear UDT :-(
             */

            if (check_floppy_change(disk))
                    floppy_revalidate(disk);

            if (UD.flags & FTD_MSG)
                printk (KERN_INFO "floppy%d: setting size %d spt %d str %d!\n",
                  drive, setprm.size, setprm.sect, setprm.stretch);

            /* what if type > 0 here? Overwrite specified entry ? */
            if (type) {
                    /* refuse to re-set a predefined type for now */
                  redo_fd_request();
                  return -EINVAL;
            }

            /* 
             * type == 0: first look for a matching entry in the type list,
             * and set the UD.disktype field to use the perdefined entry.
             * TODO: add user-defined format to head of autoprobe list ? 
             * Useful to include the user-type for future autodetection!
             */

            for (settype = 0; settype < NUM_DISK_MINORS; settype++) {
                  int setidx = 0;
                  if (minor2disktype[settype].drive_types > DriveType) {
                        /* skip this one, invalid for drive ... */
                        continue;
                  }
                  setidx = minor2disktype[settype].index;
                  dtp = &disk_type[setidx];

                  /* found matching entry ?? */
                  if (   dtp->blocks  == setprm.size 
                      && dtp->spt     == setprm.sect
                      && dtp->stretch == setprm.stretch ) {
                        if (UD.flags & FTD_MSG)
                            printk (KERN_INFO "floppy%d: setting %s %p!\n",
                                drive, dtp->name, dtp);
                        UDT = dtp;
                        set_capacity(floppy->disk, UDT->blocks);

                        if (cmd == FDDEFPRM) {
                          /* save settings as permanent default type */
                          default_params[drive].name    = dtp->name;
                          default_params[drive].spt     = dtp->spt;
                          default_params[drive].blocks  = dtp->blocks;
                          default_params[drive].fdc_speed = dtp->fdc_speed;
                          default_params[drive].stretch = dtp->stretch;
                        }
                        
                        return 0;
                  }

            }

            /* no matching disk type found above - setting user_params */

                  if (cmd == FDDEFPRM) {
                  /* set permanent type */
                  dtp = &default_params[drive];
            } else
                  /* set user type (reset by disk change!) */
                  dtp = &user_params[drive];

            dtp->name   = "user format";
            dtp->blocks = setprm.size;
            dtp->spt    = setprm.sect;
            if (setprm.sect > 14) 
                  dtp->fdc_speed = 3;
            else
                  dtp->fdc_speed = 0;
            dtp->stretch = setprm.stretch;

            if (UD.flags & FTD_MSG)
                  printk (KERN_INFO "floppy%d: blk %d spt %d str %d!\n",
                        drive, dtp->blocks, dtp->spt, dtp->stretch);

            /* sanity check */
            if (!dtp || setprm.track != dtp->blocks/dtp->spt/2 ||
                setprm.head != 2) {
                  redo_fd_request();
                  return -EINVAL;
            }

            UDT = dtp;
            set_capacity(floppy->disk, UDT->blocks);

            return 0;
      case FDMSGON:
            UD.flags |= FTD_MSG;
            return 0;
      case FDMSGOFF:
            UD.flags &= ~FTD_MSG;
            return 0;
      case FDSETEMSGTRESH:
            return -EINVAL;
      case FDFMTBEG:
            return 0;
      case FDFMTTRK:
            if (floppy->ref != 1 && floppy->ref != -1)
                  return -EBUSY;
            if (copy_from_user(&fmt_desc, argp, sizeof(fmt_desc)))
                  return -EFAULT;
            return do_format(drive, type, &fmt_desc);
      case FDCLRPRM:
            UDT = NULL;
            /* MSch: invalidate default_params */
            default_params[drive].blocks  = 0;
            set_capacity(floppy->disk, MAX_DISK_SIZE * 2);
      case FDFMTEND:
      case FDFLUSH:
            /* invalidate the buffer track to force a reread */
            BufferDrive = -1;
            set_bit(drive, &fake_change);
            check_disk_change(inode->i_bdev);
            return 0;
      default:
            return -EINVAL;
      }
}


/* Initialize the 'unit' variable for drive 'drive' */

static void __init fd_probe( int drive )
{
      UD.connected = 0;
      UDT  = NULL;

      if (!fd_test_drive_present( drive ))
            return;

      UD.connected = 1;
      UD.track     = 0;
      switch( UserSteprate[drive] ) {
      case 2:
            UD.steprate = FDCSTEP_2;
            break;
      case 3:
            UD.steprate = FDCSTEP_3;
            break;
      case 6:
            UD.steprate = FDCSTEP_6;
            break;
      case 12:
            UD.steprate = FDCSTEP_12;
            break;
      default: /* should be -1 for "not set by user" */
            if (ATARIHW_PRESENT( FDCSPEED ) || MACH_IS_MEDUSA)
                  UD.steprate = FDCSTEP_3;
            else
                  UD.steprate = FDCSTEP_6;
            break;
      }
      MotorOn = 1;      /* from probe restore operation! */
}


/* This function tests the physical presence of a floppy drive (not
 * whether a disk is inserted). This is done by issuing a restore
 * command, waiting max. 2 seconds (that should be enough to move the
 * head across the whole disk) and looking at the state of the "TR00"
 * signal. This should now be raised if there is a drive connected
 * (and there is no hardware failure :-) Otherwise, the drive is
 * declared absent.
 */

static int __init fd_test_drive_present( int drive )
{
      unsigned long timeout;
      unsigned char status;
      int ok;
      
      if (drive >= (MACH_IS_FALCON ? 1 : 2)) return( 0 );
      fd_select_drive( drive );

      /* disable interrupt temporarily */
      atari_turnoff_irq( IRQ_MFP_FDC );
      FDC_WRITE (FDCREG_TRACK, 0xff00);
      FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | FDCCMDADD_H | FDCSTEP_6 );

      timeout = jiffies + 2*HZ+HZ/2;
      while (time_before(jiffies, timeout))
            if (!(mfp.par_dt_reg & 0x20))
                  break;

      status = FDC_READ( FDCREG_STATUS );
      ok = (status & FDCSTAT_TR00) != 0;

      /* force interrupt to abort restore operation (FDC would try
       * about 50 seconds!) */
      FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
      udelay(500);
      status = FDC_READ( FDCREG_STATUS );
      udelay(20);

      if (ok) {
            /* dummy seek command to make WP bit accessible */
            FDC_WRITE( FDCREG_DATA, 0 );
            FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK );
            while( mfp.par_dt_reg & 0x20 )
                  ;
            status = FDC_READ( FDCREG_STATUS );
      }

      atari_turnon_irq( IRQ_MFP_FDC );
      return( ok );
}


/* Look how many and which kind of drives are connected. If there are
 * floppies, additionally start the disk-change and motor-off timers.
 */

static void __init config_types( void )
{
      int drive, cnt = 0;

      /* for probing drives, set the FDC speed to 8 MHz */
      if (ATARIHW_PRESENT(FDCSPEED))
            dma_wd.fdc_speed = 0;

      printk(KERN_INFO "Probing floppy drive(s):\n");
      for( drive = 0; drive < FD_MAX_UNITS; drive++ ) {
            fd_probe( drive );
            if (UD.connected) {
                  printk(KERN_INFO "fd%d\n", drive);
                  ++cnt;
            }
      }

      if (FDC_READ( FDCREG_STATUS ) & FDCSTAT_BUSY) {
            /* If FDC is still busy from probing, give it another FORCI
             * command to abort the operation. If this isn't done, the FDC
             * will interrupt later and its IRQ line stays low, because
             * the status register isn't read. And this will block any
             * interrupts on this IRQ line :-(
             */
            FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
            udelay(500);
            FDC_READ( FDCREG_STATUS );
            udelay(20);
      }
      
      if (cnt > 0) {
            start_motor_off_timer();
            if (cnt == 1) fd_select_drive( 0 );
            start_check_change_timer();
      }
}

/*
 * floppy_open check for aliasing (/dev/fd0 can be the same as
 * /dev/PS0 etc), and disallows simultaneous access to the same
 * drive with different device numbers.
 */

static int floppy_open( struct inode *inode, struct file *filp )
{
      struct atari_floppy_struct *p = inode->i_bdev->bd_disk->private_data;
      int type  = iminor(inode) >> 2;

      DPRINT(("fd_open: type=%d\n",type));
      if (p->ref && p->type != type)
            return -EBUSY;

      if (p->ref == -1 || (p->ref && filp->f_flags & O_EXCL))
            return -EBUSY;

      if (filp->f_flags & O_EXCL)
            p->ref = -1;
      else
            p->ref++;

      p->type = type;

      if (filp->f_flags & O_NDELAY)
            return 0;

      if (filp->f_mode & 3) {
            check_disk_change(inode->i_bdev);
            if (filp->f_mode & 2) {
                  if (p->wpstat) {
                        if (p->ref < 0)
                              p->ref = 0;
                        else
                              p->ref--;
                        floppy_release(inode, filp);
                        return -EROFS;
                  }
            }
      }
      return 0;
}


static int floppy_release( struct inode * inode, struct file * filp )
{
      struct atari_floppy_struct *p = inode->i_bdev->bd_disk->private_data;
      if (p->ref < 0)
            p->ref = 0;
      else if (!p->ref--) {
            printk(KERN_ERR "floppy_release with fd_ref == 0");
            p->ref = 0;
      }
      return 0;
}

static struct block_device_operations floppy_fops = {
      .owner            = THIS_MODULE,
      .open       = floppy_open,
      .release    = floppy_release,
      .ioctl            = fd_ioctl,
      .media_changed    = check_floppy_change,
      .revalidate_disk= floppy_revalidate,
};

static struct kobject *floppy_find(dev_t dev, int *part, void *data)
{
      int drive = *part & 3;
      int type  = *part >> 2;
      if (drive >= FD_MAX_UNITS || type > NUM_DISK_MINORS)
            return NULL;
      *part = 0;
      return get_disk(unit[drive].disk);
}

static int __init atari_floppy_init (void)
{
      int i;

      if (!MACH_IS_ATARI)
            /* Amiga, Mac, ... don't have Atari-compatible floppy :-) */
            return -ENXIO;

      if (MACH_IS_HADES)
            /* Hades doesn't have Atari-compatible floppy */
            return -ENXIO;

      if (register_blkdev(FLOPPY_MAJOR,"fd"))
            return -EBUSY;

      for (i = 0; i < FD_MAX_UNITS; i++) {
            unit[i].disk = alloc_disk(1);
            if (!unit[i].disk)
                  goto Enomem;
      }

      if (UseTrackbuffer < 0)
            /* not set by user -> use default: for now, we turn
               track buffering off for all Medusas, though it
               could be used with ones that have a counter
               card. But the test is too hard :-( */
            UseTrackbuffer = !MACH_IS_MEDUSA;

      /* initialize variables */
      SelectedDrive = -1;
      BufferDrive = -1;

      DMABuffer = atari_stram_alloc(BUFFER_SIZE+512, "ataflop");
      if (!DMABuffer) {
            printk(KERN_ERR "atari_floppy_init: cannot get dma buffer\n");
            goto Enomem;
      }
      TrackBuffer = DMABuffer + 512;
      PhysDMABuffer = virt_to_phys(DMABuffer);
      PhysTrackBuffer = virt_to_phys(TrackBuffer);
      BufferDrive = BufferSide = BufferTrack = -1;

      floppy_queue = blk_init_queue(do_fd_request, &ataflop_lock);
      if (!floppy_queue)
            goto Enomem;

      for (i = 0; i < FD_MAX_UNITS; i++) {
            unit[i].track = -1;
            unit[i].flags = 0;
            unit[i].disk->major = FLOPPY_MAJOR;
            unit[i].disk->first_minor = i;
            sprintf(unit[i].disk->disk_name, "fd%d", i);
            unit[i].disk->fops = &floppy_fops;
            unit[i].disk->private_data = &unit[i];
            unit[i].disk->queue = floppy_queue;
            set_capacity(unit[i].disk, MAX_DISK_SIZE * 2);
            add_disk(unit[i].disk);
      }

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

      printk(KERN_INFO "Atari floppy driver: max. %cD, %strack buffering\n",
             DriveType == 0 ? 'D' : DriveType == 1 ? 'H' : 'E',
             UseTrackbuffer ? "" : "no ");
      config_types();

      return 0;
Enomem:
      while (i--)
            put_disk(unit[i].disk);
      if (floppy_queue)
            blk_cleanup_queue(floppy_queue);
      unregister_blkdev(FLOPPY_MAJOR, "fd");
      return -ENOMEM;
}

#ifndef MODULE
static int __init atari_floppy_setup(char *str)
{
      int ints[3 + FD_MAX_UNITS];
      int i;

      if (!MACH_IS_ATARI)
            return 0;

      str = get_options(str, 3 + FD_MAX_UNITS, ints);
      
      if (ints[0] < 1) {
            printk(KERN_ERR "ataflop_setup: no arguments!\n" );
            return 0;
      }
      else if (ints[0] > 2+FD_MAX_UNITS) {
            printk(KERN_ERR "ataflop_setup: too many arguments\n" );
      }

      if (ints[1] < 0 || ints[1] > 2)
            printk(KERN_ERR "ataflop_setup: bad drive type\n" );
      else
            DriveType = ints[1];

      if (ints[0] >= 2)
            UseTrackbuffer = (ints[2] > 0);

      for( i = 3; i <= ints[0] && i-3 < FD_MAX_UNITS; ++i ) {
            if (ints[i] != 2 && ints[i] != 3 && ints[i] != 6 && ints[i] != 12)
                  printk(KERN_ERR "ataflop_setup: bad steprate\n" );
            else
                  UserSteprate[i-3] = ints[i];
      }
      return 1;
}

__setup("floppy=", atari_floppy_setup);
#endif

static void __exit atari_floppy_exit(void)
{
      int i;
      blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
      for (i = 0; i < FD_MAX_UNITS; i++) {
            del_gendisk(unit[i].disk);
            put_disk(unit[i].disk);
      }
      unregister_blkdev(FLOPPY_MAJOR, "fd");

      blk_cleanup_queue(floppy_queue);
      del_timer_sync(&fd_timer);
      atari_stram_free( DMABuffer );
}

module_init(atari_floppy_init)
module_exit(atari_floppy_exit)

MODULE_LICENSE("GPL");

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