drivers/block/ataflop.c

   1 /*
   2  *  drivers/block/ataflop.c
   3  *
   4  *  Copyright (C) 1993  Greg Harp
   5  *  Atari Support by Bjoern Brauel, Roman Hodek
   6  *
   7  *  Big cleanup Sep 11..14 1994 Roman Hodek:
   8  *   - Driver now works interrupt driven
   9  *   - Support for two drives; should work, but I cannot test that :-(
  10  *   - Reading is done in whole tracks and buffered to speed up things
  11  *   - Disk change detection and drive deselecting after motor-off
  12  *     similar to TOS
  13  *   - Autodetection of disk format (DD/HD); untested yet, because I
  14  *     don't have an HD drive :-(
  15  *
  16  *  Fixes Nov 13 1994 Martin Schaller:
  17  *   - Autodetection works now
  18  *   - Support for 5 1/4'' disks
  19  *   - Removed drive type (unknown on atari)
  20  *   - Do seeks with 8 Mhz
  21  *
  22  *  Changes by Andreas Schwab:
  23  *   - After errors in multiple read mode try again reading single sectors
  24  *  (Feb 1995):
  25  *   - Clean up error handling
  26  *   - Set blk_size for proper size checking
  27  *   - Initialize track register when testing presence of floppy
  28  *   - Implement some ioctl's
  29  *
  30  *  Changes by Torsten Lang:
  31  *   - When probing the floppies we should add the FDCCMDADD_H flag since
  32  *     the FDC will otherwise wait forever when no disk is inserted...
  33  *
  34  * ++ Freddi Aschwanden (fa) 20.9.95 fixes for medusa:
  35  *  - MFPDELAY() after each FDC access -> atari
  36  *  - more/other disk formats
  37  *  - DMA to the block buffer directly if we have a 32bit DMA
  38  *  - for medusa, the step rate is always 3ms
  39  *  - on medusa, use only cache_push()
  40  * Roman:
  41  *  - Make disk format numbering independent from minors
  42  *  - Let user set max. supported drive type (speeds up format
  43  *    detection, saves buffer space)
  44  *
  45  * Roman 10/15/95:
  46  *  - implement some more ioctls
  47  *  - disk formatting
  48  *
  49  * Andreas 95/12/12:
  50  *  - increase gap size at start of track for HD/ED disks
  51  *
  52  * Michael (MSch) 11/07/96:
  53  *  - implemented FDSETPRM and FDDEFPRM ioctl
  54  *
  55  * Andreas (97/03/19):
  56  *  - implemented missing BLK* ioctls
  57  *
  58  *  Things left to do:
  59  *   - Formatting
  60  *   - Maybe a better strategy for disk change detection (does anyone
  61  *     know one?)
  62  */
  63
  64 #include <linux/module.h>
  65
  66 #include <linux/fd.h>
  67 #include <linux/delay.h>
  68 #include <linux/init.h>
  69 #include <linux/blkdev.h>
  70
  71 #include <asm/atafd.h>
  72 #include <asm/atafdreg.h>
  73 #include <asm/atariints.h>
  74 #include <asm/atari_stdma.h>
  75 #include <asm/atari_stram.h>
  76
  77 #define FD_MAX_UNITS 2
  78
  79 #undef DEBUG
  80
  81 static struct request_queue *floppy_queue;
  82
  83 #define QUEUE (floppy_queue)
  84 #define CURRENT elv_next_request(floppy_queue)
  85
  86 /* Disk types: DD, HD, ED */
  87 static struct atari_disk_type {
  88         const char      *name;
  89         unsigned        spt;            /* sectors per track */
  90         unsigned        blocks;         /* total number of blocks */
  91         unsigned        fdc_speed;      /* fdc_speed setting */
  92         unsigned        stretch;        /* track doubling ? */
  93 } atari_disk_type[] = {
  94         { "d360",  9, 720, 0, 0},       /*  0: 360kB diskette */
  95         { "D360",  9, 720, 0, 1},       /*  1: 360kb in 720k or 1.2MB drive */
  96         { "D720",  9,1440, 0, 0},       /*  2: 720kb in 720k or 1.2MB drive */
  97         { "D820", 10,1640, 0, 0},       /*  3: DD disk with 82 tracks/10 sectors */
  98 /* formats above are probed for type DD */
  99 #define MAX_TYPE_DD 3
 100         { "h1200",15,2400, 3, 0},       /*  4: 1.2MB diskette */
 101         { "H1440",18,2880, 3, 0},       /*  5: 1.4 MB diskette (HD) */
 102         { "H1640",20,3280, 3, 0},       /*  6: 1.64MB diskette (fat HD) 82 tr 20 sec */
 103 /* formats above are probed for types DD and HD */
 104 #define MAX_TYPE_HD 6
 105         { "E2880",36,5760, 3, 0},       /*  7: 2.8 MB diskette (ED) */
 106         { "E3280",40,6560, 3, 0},       /*  8: 3.2 MB diskette (fat ED) 82 tr 40 sec */
 107 /* formats above are probed for types DD, HD and ED */
 108 #define MAX_TYPE_ED 8
 109 /* types below are never autoprobed */
 110         { "H1680",21,3360, 3, 0},       /*  9: 1.68MB diskette (fat HD) 80 tr 21 sec */
 111         { "h410",10,820, 0, 1},         /* 10: 410k diskette 41 tr 10 sec, stretch */
 112         { "h1476",18,2952, 3, 0},       /* 11: 1.48MB diskette 82 tr 18 sec */
 113         { "H1722",21,3444, 3, 0},       /* 12: 1.72MB diskette 82 tr 21 sec */
 114         { "h420",10,840, 0, 1},         /* 13: 420k diskette 42 tr 10 sec, stretch */
 115         { "H830",10,1660, 0, 0},        /* 14: 820k diskette 83 tr 10 sec */
 116         { "h1494",18,2952, 3, 0},       /* 15: 1.49MB diskette 83 tr 18 sec */
 117         { "H1743",21,3486, 3, 0},       /* 16: 1.74MB diskette 83 tr 21 sec */
 118         { "h880",11,1760, 0, 0},        /* 17: 880k diskette 80 tr 11 sec */
 119         { "D1040",13,2080, 0, 0},       /* 18: 1.04MB diskette 80 tr 13 sec */
 120         { "D1120",14,2240, 0, 0},       /* 19: 1.12MB diskette 80 tr 14 sec */
 121         { "h1600",20,3200, 3, 0},       /* 20: 1.60MB diskette 80 tr 20 sec */
 122         { "H1760",22,3520, 3, 0},       /* 21: 1.76MB diskette 80 tr 22 sec */
 123         { "H1920",24,3840, 3, 0},       /* 22: 1.92MB diskette 80 tr 24 sec */
 124         { "E3200",40,6400, 3, 0},       /* 23: 3.2MB diskette 80 tr 40 sec */
 125         { "E3520",44,7040, 3, 0},       /* 24: 3.52MB diskette 80 tr 44 sec */
 126         { "E3840",48,7680, 3, 0},       /* 25: 3.84MB diskette 80 tr 48 sec */
 127         { "H1840",23,3680, 3, 0},       /* 26: 1.84MB diskette 80 tr 23 sec */
 128         { "D800",10,1600, 0, 0},        /* 27: 800k diskette 80 tr 10 sec */
 129 };
 130
 131 static int StartDiskType[] = {
 132         MAX_TYPE_DD,
 133         MAX_TYPE_HD,
 134         MAX_TYPE_ED
 135 };
 136
 137 #define TYPE_DD         0
 138 #define TYPE_HD         1
 139 #define TYPE_ED         2
 140
 141 static int DriveType = TYPE_HD;
 142
 143 static DEFINE_SPINLOCK(ataflop_lock);
 144
 145 /* Array for translating minors into disk formats */
 146 static struct {
 147         int      index;
 148         unsigned drive_types;
 149 } minor2disktype[] = {
 150         {  0, TYPE_DD },        /*  1: d360 */
 151         {  4, TYPE_HD },        /*  2: h1200 */
 152         {  1, TYPE_DD },        /*  3: D360 */
 153         {  2, TYPE_DD },        /*  4: D720 */
 154         {  1, TYPE_DD },        /*  5: h360 = D360 */
 155         {  2, TYPE_DD },        /*  6: h720 = D720 */
 156         {  5, TYPE_HD },        /*  7: H1440 */
 157         {  7, TYPE_ED },        /*  8: E2880 */
 158 /* some PC formats :-) */
 159         {  8, TYPE_ED },        /*  9: E3280    <- was "CompaQ" == E2880 for PC */
 160         {  5, TYPE_HD },        /* 10: h1440 = H1440 */
 161         {  9, TYPE_HD },        /* 11: H1680 */
 162         { 10, TYPE_DD },        /* 12: h410  */
 163         {  3, TYPE_DD },        /* 13: H820     <- == D820, 82x10 */
 164         { 11, TYPE_HD },        /* 14: h1476 */
 165         { 12, TYPE_HD },        /* 15: H1722 */
 166         { 13, TYPE_DD },        /* 16: h420  */
 167         { 14, TYPE_DD },        /* 17: H830  */
 168         { 15, TYPE_HD },        /* 18: h1494 */
 169         { 16, TYPE_HD },        /* 19: H1743 */
 170         { 17, TYPE_DD },        /* 20: h880  */
 171         { 18, TYPE_DD },        /* 21: D1040 */
 172         { 19, TYPE_DD },        /* 22: D1120 */
 173         { 20, TYPE_HD },        /* 23: h1600 */
 174         { 21, TYPE_HD },        /* 24: H1760 */
 175         { 22, TYPE_HD },        /* 25: H1920 */
 176         { 23, TYPE_ED },        /* 26: E3200 */
 177         { 24, TYPE_ED },        /* 27: E3520 */
 178         { 25, TYPE_ED },        /* 28: E3840 */
 179         { 26, TYPE_HD },        /* 29: H1840 */
 180         { 27, TYPE_DD },        /* 30: D800  */
 181         {  6, TYPE_HD },        /* 31: H1640    <- was H1600 == h1600 for PC */
 182 };
 183
 184 #define NUM_DISK_MINORS ARRAY_SIZE(minor2disktype)
 185
 186 /*
 187  * Maximum disk size (in kilobytes). This default is used whenever the
 188  * current disk size is unknown.
 189  */
 190 #define MAX_DISK_SIZE 3280
 191
 192 /*
 193  * MSch: User-provided type information. 'drive' points to
 194  * the respective entry of this array. Set by FDSETPRM ioctls.
 195  */
 196 static struct atari_disk_type user_params[FD_MAX_UNITS];
 197
 198 /*
 199  * User-provided permanent type information. 'drive' points to
 200  * the respective entry of this array.  Set by FDDEFPRM ioctls,
 201  * restored upon disk change by floppy_revalidate() if valid (as seen by
 202  * default_params[].blocks > 0 - a bit in unit[].flags might be used for this?)
 203  */
 204 static struct atari_disk_type default_params[FD_MAX_UNITS];
 205
 206 /* current info on each unit */
 207 static struct atari_floppy_struct {
 208         int connected;                          /* !=0 : drive is connected */
 209         int autoprobe;                          /* !=0 : do autoprobe       */
 210
 211         struct atari_disk_type  *disktype;      /* current type of disk */
 212
 213         int track;              /* current head position or -1 if
 214                                    unknown */
 215         unsigned int steprate;  /* steprate setting */
 216         unsigned int wpstat;    /* current state of WP signal (for
 217                                    disk change detection) */
 218         int flags;              /* flags */
 219         struct gendisk *disk;
 220         int ref;
 221         int type;
 222 } unit[FD_MAX_UNITS];
 223
 224 #define UD      unit[drive]
 225 #define UDT     unit[drive].disktype
 226 #define SUD     unit[SelectedDrive]
 227 #define SUDT    unit[SelectedDrive].disktype
 228
 229
 230 #define FDC_READ(reg) ({                        \
 231     /* unsigned long __flags; */                \
 232     unsigned short __val;                       \
 233     /* local_irq_save(__flags); */              \
 234     dma_wd.dma_mode_status = 0x80 | (reg);      \
 235     udelay(25);                                 \
 236     __val = dma_wd.fdc_acces_seccount;          \
 237     MFPDELAY();                                 \
 238     /* local_irq_restore(__flags); */           \
 239     __val & 0xff;                               \
 240 })
 241
 242 #define FDC_WRITE(reg,val)                      \
 243     do {                                        \
 244         /* unsigned long __flags; */            \
 245         /* local_irq_save(__flags); */          \
 246         dma_wd.dma_mode_status = 0x80 | (reg);  \
 247         udelay(25);                             \
 248         dma_wd.fdc_acces_seccount = (val);      \
 249         MFPDELAY();                             \
 250         /* local_irq_restore(__flags); */       \
 251     } while(0)
 252
 253
 254 /* Buffering variables:
 255  * First, there is a DMA buffer in ST-RAM that is used for floppy DMA
 256  * operations. Second, a track buffer is used to cache a whole track
 257  * of the disk to save read operations. These are two separate buffers
 258  * because that allows write operations without clearing the track buffer.
 259  */
 260
 261 static int MaxSectors[] = {
 262         11, 22, 44
 263 };
 264 static int BufferSize[] = {
 265         15*512, 30*512, 60*512
 266 };
 267
 268 #define BUFFER_SIZE     (BufferSize[DriveType])
 269
 270 unsigned char *DMABuffer;                         /* buffer for writes */
 271 static unsigned long PhysDMABuffer;   /* physical address */
 272
 273 static int UseTrackbuffer = -1;           /* Do track buffering? */
 274 module_param(UseTrackbuffer, int, 0);
 275
 276 unsigned char *TrackBuffer;                       /* buffer for reads */
 277 static unsigned long PhysTrackBuffer; /* physical address */
 278 static int BufferDrive, BufferSide, BufferTrack;
 279 static int read_track;          /* non-zero if we are reading whole tracks */
 280
 281 #define SECTOR_BUFFER(sec)      (TrackBuffer + ((sec)-1)*512)
 282 #define IS_BUFFERED(drive,side,track) \
 283     (BufferDrive == (drive) && BufferSide == (side) && BufferTrack == (track))
 284
 285 /*
 286  * These are global variables, as that's the easiest way to give
 287  * information to interrupts. They are the data used for the current
 288  * request.
 289  */
 290 static int SelectedDrive = 0;
 291 static int ReqCmd, ReqBlock;
 292 static int ReqSide, ReqTrack, ReqSector, ReqCnt;
 293 static int HeadSettleFlag = 0;
 294 static unsigned char *ReqData, *ReqBuffer;
 295 static int MotorOn = 0, MotorOffTrys;
 296 static int IsFormatting = 0, FormatError;
 297
 298 static int UserSteprate[FD_MAX_UNITS] = { -1, -1 };
 299 module_param_array(UserSteprate, int, NULL, 0);
 300
 301 /* Synchronization of FDC access. */
 302 static volatile int fdc_busy = 0;
 303 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
 304 static DECLARE_WAIT_QUEUE_HEAD(format_wait);
 305
 306 static unsigned long changed_floppies = 0xff, fake_change = 0;
 307 #define CHECK_CHANGE_DELAY      HZ/2
 308
 309 #define FD_MOTOR_OFF_DELAY      (3*HZ)
 310 #define FD_MOTOR_OFF_MAXTRY     (10*20)
 311
 312 #define FLOPPY_TIMEOUT          (6*HZ)
 313 #define RECALIBRATE_ERRORS      4       /* After this many errors the drive
 314                                          * will be recalibrated. */
 315 #define MAX_ERRORS              8       /* After this many errors the driver
 316                                          * will give up. */
 317
 318
 319 /*
 320  * The driver is trying to determine the correct media format
 321  * while Probing is set. fd_rwsec_done() clears it after a
 322  * successful access.
 323  */
 324 static int Probing = 0;
 325
 326 /* This flag is set when a dummy seek is necessary to make the WP
 327  * status bit accessible.
 328  */
 329 static int NeedSeek = 0;
 330
 331
 332 #ifdef DEBUG
 333 #define DPRINT(a)       printk a
 334 #else
 335 #define DPRINT(a)
 336 #endif
 337
 338 /***************************** Prototypes *****************************/
 339
 340 static void fd_select_side( int side );
 341 static void fd_select_drive( int drive );
 342 static void fd_deselect( void );
 343 static void fd_motor_off_timer( unsigned long dummy );
 344 static void check_change( unsigned long dummy );
 345 static irqreturn_t floppy_irq (int irq, void *dummy);
 346 static void fd_error( void );
 347 static int do_format(int drive, int type, struct atari_format_descr *desc);
 348 static void do_fd_action( int drive );
 349 static void fd_calibrate( void );
 350 static void fd_calibrate_done( int status );
 351 static void fd_seek( void );
 352 static void fd_seek_done( int status );
 353 static void fd_rwsec( void );
 354 static void fd_readtrack_check( unsigned long dummy );
 355 static void fd_rwsec_done( int status );
 356 static void fd_rwsec_done1(int status);
 357 static void fd_writetrack( void );
 358 static void fd_writetrack_done( int status );
 359 static void fd_times_out( unsigned long dummy );
 360 static void finish_fdc( void );
 361 static void finish_fdc_done( int dummy );
 362 static void setup_req_params( int drive );
 363 static void redo_fd_request( void);
 364 static int fd_ioctl(struct block_device *bdev, fmode_t mode, unsigned int
 365                      cmd, unsigned long param);
 366 static void fd_probe( int drive );
 367 static int fd_test_drive_present( int drive );
 368 static void config_types( void );
 369 static int floppy_open(struct block_device *bdev, fmode_t mode);
 370 static int floppy_release(struct gendisk *disk, fmode_t mode);
 371
 372 /************************* End of Prototypes **************************/
 373
 374 static DEFINE_TIMER(motor_off_timer, fd_motor_off_timer, 0, 0);
 375 static DEFINE_TIMER(readtrack_timer, fd_readtrack_check, 0, 0);
 376 static DEFINE_TIMER(timeout_timer, fd_times_out, 0, 0);
 377 static DEFINE_TIMER(fd_timer, check_change, 0, 0);
 378
 379 static inline void start_motor_off_timer(void)
 380 {
 381         mod_timer(&motor_off_timer, jiffies + FD_MOTOR_OFF_DELAY);
 382         MotorOffTrys = 0;
 383 }
 384
 385 static inline void start_check_change_timer( void )
 386 {
 387         mod_timer(&fd_timer, jiffies + CHECK_CHANGE_DELAY);
 388 }
 389
 390 static inline void start_timeout(void)
 391 {
 392         mod_timer(&timeout_timer, jiffies + FLOPPY_TIMEOUT);
 393 }
 394
 395 static inline void stop_timeout(void)
 396 {
 397         del_timer(&timeout_timer);
 398 }
 399
 400 /* Select the side to use. */
 401
 402 static void fd_select_side( int side )
 403 {
 404         unsigned long flags;
 405
 406         /* protect against various other ints mucking around with the PSG */
 407         local_irq_save(flags);
 408
 409         sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
 410         sound_ym.wd_data = (side == 0) ? sound_ym.rd_data_reg_sel | 0x01 :
 411                                          sound_ym.rd_data_reg_sel & 0xfe;
 412
 413         local_irq_restore(flags);
 414 }
 415
 416
 417 /* Select a drive, update the FDC's track register and set the correct
 418  * clock speed for this disk's type.
 419  */
 420
 421 static void fd_select_drive( int drive )
 422 {
 423         unsigned long flags;
 424         unsigned char tmp;
 425
 426         if (drive == SelectedDrive)
 427           return;
 428
 429         /* protect against various other ints mucking around with the PSG */
 430         local_irq_save(flags);
 431         sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
 432         tmp = sound_ym.rd_data_reg_sel;
 433         sound_ym.wd_data = (tmp | DSKDRVNONE) & ~(drive == 0 ? DSKDRV0 : DSKDRV1);
 434         atari_dont_touch_floppy_select = 1;
 435         local_irq_restore(flags);
 436
 437         /* restore track register to saved value */
 438         FDC_WRITE( FDCREG_TRACK, UD.track );
 439         udelay(25);
 440
 441         /* select 8/16 MHz */
 442         if (UDT)
 443                 if (ATARIHW_PRESENT(FDCSPEED))
 444                         dma_wd.fdc_speed = UDT->fdc_speed;
 445
 446         SelectedDrive = drive;
 447 }
 448
 449
 450 /* Deselect both drives. */
 451
 452 static void fd_deselect( void )
 453 {
 454         unsigned long flags;
 455
 456         /* protect against various other ints mucking around with the PSG */
 457         local_irq_save(flags);
 458         atari_dont_touch_floppy_select = 0;
 459         sound_ym.rd_data_reg_sel=14;    /* Select PSG Port A */
 460         sound_ym.wd_data = (sound_ym.rd_data_reg_sel |
 461                             (MACH_IS_FALCON ? 3 : 7)); /* no drives selected */
 462         /* On Falcon, the drive B select line is used on the printer port, so
 463          * leave it alone... */
 464         SelectedDrive = -1;
 465         local_irq_restore(flags);
 466 }
 467
 468
 469 /* This timer function deselects the drives when the FDC switched the
 470  * motor off. The deselection cannot happen earlier because the FDC
 471  * counts the index signals, which arrive only if one drive is selected.
 472  */
 473
 474 static void fd_motor_off_timer( unsigned long dummy )
 475 {
 476         unsigned char status;
 477
 478         if (SelectedDrive < 0)
 479                 /* no drive selected, needn't deselect anyone */
 480                 return;
 481
 482         if (stdma_islocked())
 483                 goto retry;
 484
 485         status = FDC_READ( FDCREG_STATUS );
 486
 487         if (!(status & 0x80)) {
 488                 /* motor already turned off by FDC -> deselect drives */
 489                 MotorOn = 0;
 490                 fd_deselect();
 491                 return;
 492         }
 493         /* not yet off, try again */
 494
 495   retry:
 496         /* Test again later; if tested too often, it seems there is no disk
 497          * in the drive and the FDC will leave the motor on forever (or,
 498          * at least until a disk is inserted). So we'll test only twice
 499          * per second from then on...
 500          */
 501         mod_timer(&motor_off_timer,
 502                   jiffies + (MotorOffTrys++ < FD_MOTOR_OFF_MAXTRY ? HZ/20 : HZ/2));
 503 }
 504
 505
 506 /* This function is repeatedly called to detect disk changes (as good
 507  * as possible) and keep track of the current state of the write protection.
 508  */
 509
 510 static void check_change( unsigned long dummy )
 511 {
 512         static int    drive = 0;
 513
 514         unsigned long flags;
 515         unsigned char old_porta;
 516         int                       stat;
 517
 518         if (++drive > 1 || !UD.connected)
 519                 drive = 0;
 520
 521         /* protect against various other ints mucking around with the PSG */
 522         local_irq_save(flags);
 523
 524         if (!stdma_islocked()) {
 525                 sound_ym.rd_data_reg_sel = 14;
 526                 old_porta = sound_ym.rd_data_reg_sel;
 527                 sound_ym.wd_data = (old_porta | DSKDRVNONE) &
 528                                        ~(drive == 0 ? DSKDRV0 : DSKDRV1);
 529                 stat = !!(FDC_READ( FDCREG_STATUS ) & FDCSTAT_WPROT);
 530                 sound_ym.wd_data = old_porta;
 531
 532                 if (stat != UD.wpstat) {
 533                         DPRINT(( "wpstat[%d] = %d\n", drive, stat ));
 534                         UD.wpstat = stat;
 535                         set_bit (drive, &changed_floppies);
 536                 }
 537         }
 538         local_irq_restore(flags);
 539
 540         start_check_change_timer();
 541 }
 542
 543
 544 /* Handling of the Head Settling Flag: This flag should be set after each
 545  * seek operation, because we don't use seeks with verify.
 546  */
 547
 548 static inline void set_head_settle_flag(void)
 549 {
 550         HeadSettleFlag = FDCCMDADD_E;
 551 }
 552
 553 static inline int get_head_settle_flag(void)
 554 {
 555         int     tmp = HeadSettleFlag;
 556         HeadSettleFlag = 0;
 557         return( tmp );
 558 }
 559
 560 static inline void copy_buffer(void *from, void *to)
 561 {
 562         ulong *p1 = (ulong *)from, *p2 = (ulong *)to;
 563         int cnt;
 564
 565         for (cnt = 512/4; cnt; cnt--)
 566                 *p2++ = *p1++;
 567 }
 568
 569
 570
 571
 572 /* General Interrupt Handling */
 573
 574 static void (*FloppyIRQHandler)( int status ) = NULL;
 575
 576 static irqreturn_t floppy_irq (int irq, void *dummy)
 577 {
 578         unsigned char status;
 579         void (*handler)( int );
 580
 581         handler = xchg(&FloppyIRQHandler, NULL);
 582
 583         if (handler) {
 584                 nop();
 585                 status = FDC_READ( FDCREG_STATUS );
 586                 DPRINT(("FDC irq, status = %02x handler = %08lx\n",status,(unsigned long)handler));
 587                 handler( status );
 588         }
 589         else {
 590                 DPRINT(("FDC irq, no handler\n"));
 591         }
 592         return IRQ_HANDLED;
 593 }
 594
 595
 596 /* Error handling: If some error happened, retry some times, then
 597  * recalibrate, then try again, and fail after MAX_ERRORS.
 598  */
 599
 600 static void fd_error( void )
 601 {
 602         if (IsFormatting) {
 603                 IsFormatting = 0;
 604                 FormatError = 1;
 605                 wake_up( &format_wait );
 606                 return;
 607         }
 608
 609         if (!CURRENT)
 610                 return;
 611
 612         CURRENT->errors++;
 613         if (CURRENT->errors >= MAX_ERRORS) {
 614                 printk(KERN_ERR "fd%d: too many errors.\n", SelectedDrive );
 615                 end_request(CURRENT, 0);
 616         }
 617         else if (CURRENT->errors == RECALIBRATE_ERRORS) {
 618                 printk(KERN_WARNING "fd%d: recalibrating\n", SelectedDrive );
 619                 if (SelectedDrive != -1)
 620                         SUD.track = -1;
 621         }
 622         redo_fd_request();
 623 }
 624
 625
 626
 627 #define SET_IRQ_HANDLER(proc) do { FloppyIRQHandler = (proc); } while(0)
 628
 629
 630 /* ---------- Formatting ---------- */
 631
 632 #define FILL(n,val)             \
 633     do {                        \
 634         memset( p, val, n );    \
 635         p += n;                 \
 636     } while(0)
 637
 638 static int do_format(int drive, int type, struct atari_format_descr *desc)
 639 {
 640         unsigned char   *p;
 641         int sect, nsect;
 642         unsigned long   flags;
 643
 644         DPRINT(("do_format( dr=%d tr=%d he=%d offs=%d )\n",
 645                 drive, desc->track, desc->head, desc->sect_offset ));
 646
 647         local_irq_save(flags);
 648         while( fdc_busy ) sleep_on( &fdc_wait );
 649         fdc_busy = 1;
 650         stdma_lock(floppy_irq, NULL);
 651         atari_turnon_irq( IRQ_MFP_FDC ); /* should be already, just to be sure */
 652         local_irq_restore(flags);
 653
 654         if (type) {
 655                 if (--type >= NUM_DISK_MINORS ||
 656                     minor2disktype[type].drive_types > DriveType) {
 657                         redo_fd_request();
 658                         return -EINVAL;
 659                 }
 660                 type = minor2disktype[type].index;
 661                 UDT = &atari_disk_type[type];
 662         }
 663
 664         if (!UDT || desc->track >= UDT->blocks/UDT->spt/2 || desc->head >= 2) {
 665                 redo_fd_request();
 666                 return -EINVAL;
 667         }
 668
 669         nsect = UDT->spt;
 670         p = TrackBuffer;
 671         /* The track buffer is used for the raw track data, so its
 672            contents become invalid! */
 673         BufferDrive = -1;
 674         /* stop deselect timer */
 675         del_timer( &motor_off_timer );
 676
 677         FILL( 60 * (nsect / 9), 0x4e );
 678         for( sect = 0; sect < nsect; ++sect ) {
 679                 FILL( 12, 0 );
 680                 FILL( 3, 0xf5 );
 681                 *p++ = 0xfe;
 682                 *p++ = desc->track;
 683                 *p++ = desc->head;
 684                 *p++ = (nsect + sect - desc->sect_offset) % nsect + 1;
 685                 *p++ = 2;
 686                 *p++ = 0xf7;
 687                 FILL( 22, 0x4e );
 688                 FILL( 12, 0 );
 689                 FILL( 3, 0xf5 );
 690                 *p++ = 0xfb;
 691                 FILL( 512, 0xe5 );
 692                 *p++ = 0xf7;
 693                 FILL( 40, 0x4e );
 694         }
 695         FILL( TrackBuffer+BUFFER_SIZE-p, 0x4e );
 696
 697         IsFormatting = 1;
 698         FormatError = 0;
 699         ReqTrack = desc->track;
 700         ReqSide  = desc->head;
 701         do_fd_action( drive );
 702
 703         sleep_on( &format_wait );
 704
 705         redo_fd_request();
 706         return( FormatError ? -EIO : 0 );
 707 }
 708
 709
 710 /* do_fd_action() is the general procedure for a fd request: All
 711  * required parameter settings (drive select, side select, track
 712  * position) are checked and set if needed. For each of these
 713  * parameters and the actual reading or writing exist two functions:
 714  * one that starts the setting (or skips it if possible) and one
 715  * callback for the "done" interrupt. Each done func calls the next
 716  * set function to propagate the request down to fd_rwsec_done().
 717  */
 718
 719 static void do_fd_action( int drive )
 720 {
 721         DPRINT(("do_fd_action\n"));
 722
 723         if (UseTrackbuffer && !IsFormatting) {
 724         repeat:
 725             if (IS_BUFFERED( drive, ReqSide, ReqTrack )) {
 726                 if (ReqCmd == READ) {
 727                     copy_buffer( SECTOR_BUFFER(ReqSector), ReqData );
 728                     if (++ReqCnt < CURRENT->current_nr_sectors) {
 729                         /* read next sector */
 730                         setup_req_params( drive );
 731                         goto repeat;
 732                     }
 733                     else {
 734                         /* all sectors finished */
 735                         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
 736                         CURRENT->sector += CURRENT->current_nr_sectors;
 737                         end_request(CURRENT, 1);
 738                         redo_fd_request();
 739                         return;
 740                     }
 741                 }
 742                 else {
 743                     /* cmd == WRITE, pay attention to track buffer
 744                      * consistency! */
 745                     copy_buffer( ReqData, SECTOR_BUFFER(ReqSector) );
 746                 }
 747             }
 748         }
 749
 750         if (SelectedDrive != drive)
 751                 fd_select_drive( drive );
 752
 753         if (UD.track == -1)
 754                 fd_calibrate();
 755         else if (UD.track != ReqTrack << UDT->stretch)
 756                 fd_seek();
 757         else if (IsFormatting)
 758                 fd_writetrack();
 759         else
 760                 fd_rwsec();
 761 }
 762
 763
 764 /* Seek to track 0 if the current track is unknown */
 765
 766 static void fd_calibrate( void )
 767 {
 768         if (SUD.track >= 0) {
 769                 fd_calibrate_done( 0 );
 770                 return;
 771         }
 772
 773         if (ATARIHW_PRESENT(FDCSPEED))
 774                 dma_wd.fdc_speed = 0;   /* always seek with 8 Mhz */;
 775         DPRINT(("fd_calibrate\n"));
 776         SET_IRQ_HANDLER( fd_calibrate_done );
 777         /* we can't verify, since the speed may be incorrect */
 778         FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | SUD.steprate );
 779
 780         NeedSeek = 1;
 781         MotorOn = 1;
 782         start_timeout();
 783         /* wait for IRQ */
 784 }
 785
 786
 787 static void fd_calibrate_done( int status )
 788 {
 789         DPRINT(("fd_calibrate_done()\n"));
 790         stop_timeout();
 791
 792         /* set the correct speed now */
 793         if (ATARIHW_PRESENT(FDCSPEED))
 794                 dma_wd.fdc_speed = SUDT->fdc_speed;
 795         if (status & FDCSTAT_RECNF) {
 796                 printk(KERN_ERR "fd%d: restore failed\n", SelectedDrive );
 797                 fd_error();
 798         }
 799         else {
 800                 SUD.track = 0;
 801                 fd_seek();
 802         }
 803 }
 804
 805
 806 /* Seek the drive to the requested track. The drive must have been
 807  * calibrated at some point before this.
 808  */
 809
 810 static void fd_seek( void )
 811 {
 812         if (SUD.track == ReqTrack << SUDT->stretch) {
 813                 fd_seek_done( 0 );
 814                 return;
 815         }
 816
 817         if (ATARIHW_PRESENT(FDCSPEED)) {
 818                 dma_wd.fdc_speed = 0;   /* always seek witch 8 Mhz */
 819                 MFPDELAY();
 820         }
 821
 822         DPRINT(("fd_seek() to track %d\n",ReqTrack));
 823         FDC_WRITE( FDCREG_DATA, ReqTrack << SUDT->stretch);
 824         udelay(25);
 825         SET_IRQ_HANDLER( fd_seek_done );
 826         FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK | SUD.steprate );
 827
 828         MotorOn = 1;
 829         set_head_settle_flag();
 830         start_timeout();
 831         /* wait for IRQ */
 832 }
 833
 834
 835 static void fd_seek_done( int status )
 836 {
 837         DPRINT(("fd_seek_done()\n"));
 838         stop_timeout();
 839
 840         /* set the correct speed */
 841         if (ATARIHW_PRESENT(FDCSPEED))
 842                 dma_wd.fdc_speed = SUDT->fdc_speed;
 843         if (status & FDCSTAT_RECNF) {
 844                 printk(KERN_ERR "fd%d: seek error (to track %d)\n",
 845                                 SelectedDrive, ReqTrack );
 846                 /* we don't know exactly which track we are on now! */
 847                 SUD.track = -1;
 848                 fd_error();
 849         }
 850         else {
 851                 SUD.track = ReqTrack << SUDT->stretch;
 852                 NeedSeek = 0;
 853                 if (IsFormatting)
 854                         fd_writetrack();
 855                 else
 856                         fd_rwsec();
 857         }
 858 }
 859
 860
 861 /* This does the actual reading/writing after positioning the head
 862  * over the correct track.
 863  */
 864
 865 static int MultReadInProgress = 0;
 866
 867
 868 static void fd_rwsec( void )
 869 {
 870         unsigned long paddr, flags;
 871         unsigned int  rwflag, old_motoron;
 872         unsigned int track;
 873
 874         DPRINT(("fd_rwsec(), Sec=%d, Access=%c\n",ReqSector, ReqCmd == WRITE ? 'w' : 'r' ));
 875         if (ReqCmd == WRITE) {
 876                 if (ATARIHW_PRESENT(EXTD_DMA)) {
 877                         paddr = virt_to_phys(ReqData);
 878                 }
 879                 else {
 880                         copy_buffer( ReqData, DMABuffer );
 881                         paddr = PhysDMABuffer;
 882                 }
 883                 dma_cache_maintenance( paddr, 512, 1 );
 884                 rwflag = 0x100;
 885         }
 886         else {
 887                 if (read_track)
 888                         paddr = PhysTrackBuffer;
 889                 else
 890                         paddr = ATARIHW_PRESENT(EXTD_DMA) ?
 891                                 virt_to_phys(ReqData) : PhysDMABuffer;
 892                 rwflag = 0;
 893         }
 894
 895         fd_select_side( ReqSide );
 896
 897         /* Start sector of this operation */
 898         FDC_WRITE( FDCREG_SECTOR, read_track ? 1 : ReqSector );
 899         MFPDELAY();
 900         /* Cheat for track if stretch != 0 */
 901         if (SUDT->stretch) {
 902                 track = FDC_READ( FDCREG_TRACK);
 903                 MFPDELAY();
 904                 FDC_WRITE( FDCREG_TRACK, track >> SUDT->stretch);
 905         }
 906         udelay(25);
 907
 908         /* Setup DMA */
 909         local_irq_save(flags);
 910         dma_wd.dma_lo = (unsigned char)paddr;
 911         MFPDELAY();
 912         paddr >>= 8;
 913         dma_wd.dma_md = (unsigned char)paddr;
 914         MFPDELAY();
 915         paddr >>= 8;
 916         if (ATARIHW_PRESENT(EXTD_DMA))
 917                 st_dma_ext_dmahi = (unsigned short)paddr;
 918         else
 919                 dma_wd.dma_hi = (unsigned char)paddr;
 920         MFPDELAY();
 921         local_irq_restore(flags);
 922
 923         /* Clear FIFO and switch DMA to correct mode */
 924         dma_wd.dma_mode_status = 0x90 | rwflag;
 925         MFPDELAY();
 926         dma_wd.dma_mode_status = 0x90 | (rwflag ^ 0x100);
 927         MFPDELAY();
 928         dma_wd.dma_mode_status = 0x90 | rwflag;
 929         MFPDELAY();
 930
 931         /* How many sectors for DMA */
 932         dma_wd.fdc_acces_seccount = read_track ? SUDT->spt : 1;
 933
 934         udelay(25);
 935
 936         /* Start operation */
 937         dma_wd.dma_mode_status = FDCSELREG_STP | rwflag;
 938         udelay(25);
 939         SET_IRQ_HANDLER( fd_rwsec_done );
 940         dma_wd.fdc_acces_seccount =
 941           (get_head_settle_flag() |
 942            (rwflag ? FDCCMD_WRSEC : (FDCCMD_RDSEC | (read_track ? FDCCMDADD_M : 0))));
 943
 944         old_motoron = MotorOn;
 945         MotorOn = 1;
 946         NeedSeek = 1;
 947         /* wait for interrupt */
 948
 949         if (read_track) {
 950                 /* If reading a whole track, wait about one disk rotation and
 951                  * then check if all sectors are read. The FDC will even
 952                  * search for the first non-existent sector and need 1 sec to
 953                  * recognise that it isn't present :-(
 954                  */
 955                 MultReadInProgress = 1;
 956                 mod_timer(&readtrack_timer,
 957                           /* 1 rot. + 5 rot.s if motor was off  */
 958                           jiffies + HZ/5 + (old_motoron ? 0 : HZ));
 959         }
 960         start_timeout();
 961 }
 962
 963
 964 static void fd_readtrack_check( unsigned long dummy )
 965 {
 966         unsigned long flags, addr, addr2;
 967
 968         local_irq_save(flags);
 969
 970         if (!MultReadInProgress) {
 971                 /* This prevents a race condition that could arise if the
 972                  * interrupt is triggered while the calling of this timer
 973                  * callback function takes place. The IRQ function then has
 974                  * already cleared 'MultReadInProgress'  when flow of control
 975                  * gets here.
 976                  */
 977                 local_irq_restore(flags);
 978                 return;
 979         }
 980
 981         /* get the current DMA address */
 982         /* ++ f.a. read twice to avoid being fooled by switcher */
 983         addr = 0;
 984         do {
 985                 addr2 = addr;
 986                 addr = dma_wd.dma_lo & 0xff;
 987                 MFPDELAY();
 988                 addr |= (dma_wd.dma_md & 0xff) << 8;
 989                 MFPDELAY();
 990                 if (ATARIHW_PRESENT( EXTD_DMA ))
 991                         addr |= (st_dma_ext_dmahi & 0xffff) << 16;
 992                 else
 993                         addr |= (dma_wd.dma_hi & 0xff) << 16;
 994                 MFPDELAY();
 995         } while(addr != addr2);
 996
 997         if (addr >= PhysTrackBuffer + SUDT->spt*512) {
 998                 /* already read enough data, force an FDC interrupt to stop
 999                  * the read operation
1000                  */
1001                 SET_IRQ_HANDLER( NULL );
1002                 MultReadInProgress = 0;
1003                 local_irq_restore(flags);
1004                 DPRINT(("fd_readtrack_check(): done\n"));
1005                 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1006                 udelay(25);
1007
1008                 /* No error until now -- the FDC would have interrupted
1009                  * otherwise!
1010                  */
1011                 fd_rwsec_done1(0);
1012         }
1013         else {
1014                 /* not yet finished, wait another tenth rotation */
1015                 local_irq_restore(flags);
1016                 DPRINT(("fd_readtrack_check(): not yet finished\n"));
1017                 mod_timer(&readtrack_timer, jiffies + HZ/5/10);
1018         }
1019 }
1020
1021
1022 static void fd_rwsec_done( int status )
1023 {
1024         DPRINT(("fd_rwsec_done()\n"));
1025
1026         if (read_track) {
1027                 del_timer(&readtrack_timer);
1028                 if (!MultReadInProgress)
1029                         return;
1030                 MultReadInProgress = 0;
1031         }
1032         fd_rwsec_done1(status);
1033 }
1034
1035 static void fd_rwsec_done1(int status)
1036 {
1037         unsigned int track;
1038
1039         stop_timeout();
1040
1041         /* Correct the track if stretch != 0 */
1042         if (SUDT->stretch) {
1043                 track = FDC_READ( FDCREG_TRACK);
1044                 MFPDELAY();
1045                 FDC_WRITE( FDCREG_TRACK, track << SUDT->stretch);
1046         }
1047
1048         if (!UseTrackbuffer) {
1049                 dma_wd.dma_mode_status = 0x90;
1050                 MFPDELAY();
1051                 if (!(dma_wd.dma_mode_status & 0x01)) {
1052                         printk(KERN_ERR "fd%d: DMA error\n", SelectedDrive );
1053                         goto err_end;
1054                 }
1055         }
1056         MFPDELAY();
1057
1058         if (ReqCmd == WRITE && (status & FDCSTAT_WPROT)) {
1059                 printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive );
1060                 goto err_end;
1061         }
1062         if ((status & FDCSTAT_RECNF) &&
1063             /* RECNF is no error after a multiple read when the FDC
1064                searched for a non-existent sector! */
1065             !(read_track && FDC_READ(FDCREG_SECTOR) > SUDT->spt)) {
1066                 if (Probing) {
1067                         if (SUDT > atari_disk_type) {
1068                             if (SUDT[-1].blocks > ReqBlock) {
1069                                 /* try another disk type */
1070                                 SUDT--;
1071                                 set_capacity(unit[SelectedDrive].disk,
1072                                                         SUDT->blocks);
1073                             } else
1074                                 Probing = 0;
1075                         }
1076                         else {
1077                                 if (SUD.flags & FTD_MSG)
1078                                         printk(KERN_INFO "fd%d: Auto-detected floppy type %s\n",
1079                                                SelectedDrive, SUDT->name );
1080                                 Probing=0;
1081                         }
1082                 } else {
1083 /* record not found, but not probing. Maybe stretch wrong ? Restart probing */
1084                         if (SUD.autoprobe) {
1085                                 SUDT = atari_disk_type + StartDiskType[DriveType];
1086                                 set_capacity(unit[SelectedDrive].disk,
1087                                                         SUDT->blocks);
1088                                 Probing = 1;
1089                         }
1090                 }
1091                 if (Probing) {
1092                         if (ATARIHW_PRESENT(FDCSPEED)) {
1093                                 dma_wd.fdc_speed = SUDT->fdc_speed;
1094                                 MFPDELAY();
1095                         }
1096                         setup_req_params( SelectedDrive );
1097                         BufferDrive = -1;
1098                         do_fd_action( SelectedDrive );
1099                         return;
1100                 }
1101
1102                 printk(KERN_ERR "fd%d: sector %d not found (side %d, track %d)\n",
1103                        SelectedDrive, FDC_READ (FDCREG_SECTOR), ReqSide, ReqTrack );
1104                 goto err_end;
1105         }
1106         if (status & FDCSTAT_CRC) {
1107                 printk(KERN_ERR "fd%d: CRC error (side %d, track %d, sector %d)\n",
1108                        SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) );
1109                 goto err_end;
1110         }
1111         if (status & FDCSTAT_LOST) {
1112                 printk(KERN_ERR "fd%d: lost data (side %d, track %d, sector %d)\n",
1113                        SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) );
1114                 goto err_end;
1115         }
1116
1117         Probing = 0;
1118
1119         if (ReqCmd == READ) {
1120                 if (!read_track) {
1121                         void *addr;
1122                         addr = ATARIHW_PRESENT( EXTD_DMA ) ? ReqData : DMABuffer;
1123                         dma_cache_maintenance( virt_to_phys(addr), 512, 0 );
1124                         if (!ATARIHW_PRESENT( EXTD_DMA ))
1125                                 copy_buffer (addr, ReqData);
1126                 } else {
1127                         dma_cache_maintenance( PhysTrackBuffer, MaxSectors[DriveType] * 512, 0 );
1128                         BufferDrive = SelectedDrive;
1129                         BufferSide  = ReqSide;
1130                         BufferTrack = ReqTrack;
1131                         copy_buffer (SECTOR_BUFFER (ReqSector), ReqData);
1132                 }
1133         }
1134
1135         if (++ReqCnt < CURRENT->current_nr_sectors) {
1136                 /* read next sector */
1137                 setup_req_params( SelectedDrive );
1138                 do_fd_action( SelectedDrive );
1139         }
1140         else {
1141                 /* all sectors finished */
1142                 CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
1143                 CURRENT->sector += CURRENT->current_nr_sectors;
1144                 end_request(CURRENT, 1);
1145                 redo_fd_request();
1146         }
1147         return;
1148
1149   err_end:
1150         BufferDrive = -1;
1151         fd_error();
1152 }
1153
1154
1155 static void fd_writetrack( void )
1156 {
1157         unsigned long paddr, flags;
1158         unsigned int track;
1159
1160         DPRINT(("fd_writetrack() Tr=%d Si=%d\n", ReqTrack, ReqSide ));
1161
1162         paddr = PhysTrackBuffer;
1163         dma_cache_maintenance( paddr, BUFFER_SIZE, 1 );
1164
1165         fd_select_side( ReqSide );
1166
1167         /* Cheat for track if stretch != 0 */
1168         if (SUDT->stretch) {
1169                 track = FDC_READ( FDCREG_TRACK);
1170                 MFPDELAY();
1171                 FDC_WRITE(FDCREG_TRACK,track >> SUDT->stretch);
1172         }
1173         udelay(40);
1174
1175         /* Setup DMA */
1176         local_irq_save(flags);
1177         dma_wd.dma_lo = (unsigned char)paddr;
1178         MFPDELAY();
1179         paddr >>= 8;
1180         dma_wd.dma_md = (unsigned char)paddr;
1181         MFPDELAY();
1182         paddr >>= 8;
1183         if (ATARIHW_PRESENT( EXTD_DMA ))
1184                 st_dma_ext_dmahi = (unsigned short)paddr;
1185         else
1186                 dma_wd.dma_hi = (unsigned char)paddr;
1187         MFPDELAY();
1188         local_irq_restore(flags);
1189
1190         /* Clear FIFO and switch DMA to correct mode */
1191         dma_wd.dma_mode_status = 0x190;
1192         MFPDELAY();
1193         dma_wd.dma_mode_status = 0x90;
1194         MFPDELAY();
1195         dma_wd.dma_mode_status = 0x190;
1196         MFPDELAY();
1197
1198         /* How many sectors for DMA */
1199         dma_wd.fdc_acces_seccount = BUFFER_SIZE/512;
1200         udelay(40);
1201
1202         /* Start operation */
1203         dma_wd.dma_mode_status = FDCSELREG_STP | 0x100;
1204         udelay(40);
1205         SET_IRQ_HANDLER( fd_writetrack_done );
1206         dma_wd.fdc_acces_seccount = FDCCMD_WRTRA | get_head_settle_flag();
1207
1208         MotorOn = 1;
1209         start_timeout();
1210         /* wait for interrupt */
1211 }
1212
1213
1214 static void fd_writetrack_done( int status )
1215 {
1216         DPRINT(("fd_writetrack_done()\n"));
1217
1218         stop_timeout();
1219
1220         if (status & FDCSTAT_WPROT) {
1221                 printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive );
1222                 goto err_end;
1223         }
1224         if (status & FDCSTAT_LOST) {
1225                 printk(KERN_ERR "fd%d: lost data (side %d, track %d)\n",
1226                                 SelectedDrive, ReqSide, ReqTrack );
1227                 goto err_end;
1228         }
1229
1230         wake_up( &format_wait );
1231         return;
1232
1233   err_end:
1234         fd_error();
1235 }
1236
1237 static void fd_times_out( unsigned long dummy )
1238 {
1239         atari_disable_irq( IRQ_MFP_FDC );
1240         if (!FloppyIRQHandler) goto end; /* int occurred after timer was fired, but
1241                                           * before we came here... */
1242
1243         SET_IRQ_HANDLER( NULL );
1244         /* If the timeout occurred while the readtrack_check timer was
1245          * active, we need to cancel it, else bad things will happen */
1246         if (UseTrackbuffer)
1247                 del_timer( &readtrack_timer );
1248         FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1249         udelay( 25 );
1250
1251         printk(KERN_ERR "floppy timeout\n" );
1252         fd_error();
1253   end:
1254         atari_enable_irq( IRQ_MFP_FDC );
1255 }
1256
1257
1258 /* The (noop) seek operation here is needed to make the WP bit in the
1259  * FDC status register accessible for check_change. If the last disk
1260  * operation would have been a RDSEC, this bit would always read as 0
1261  * no matter what :-( To save time, the seek goes to the track we're
1262  * already on.
1263  */
1264
1265 static void finish_fdc( void )
1266 {
1267         if (!NeedSeek) {
1268                 finish_fdc_done( 0 );
1269         }
1270         else {
1271                 DPRINT(("finish_fdc: dummy seek started\n"));
1272                 FDC_WRITE (FDCREG_DATA, SUD.track);
1273                 SET_IRQ_HANDLER( finish_fdc_done );
1274                 FDC_WRITE (FDCREG_CMD, FDCCMD_SEEK);
1275                 MotorOn = 1;
1276                 start_timeout();
1277                 /* we must wait for the IRQ here, because the ST-DMA
1278                    is released immediately afterwards and the interrupt
1279                    may be delivered to the wrong driver. */
1280           }
1281 }
1282
1283
1284 static void finish_fdc_done( int dummy )
1285 {
1286         unsigned long flags;
1287
1288         DPRINT(("finish_fdc_done entered\n"));
1289         stop_timeout();
1290         NeedSeek = 0;
1291
1292         if (timer_pending(&fd_timer) && time_before(fd_timer.expires, jiffies + 5))
1293                 /* If the check for a disk change is done too early after this
1294                  * last seek command, the WP bit still reads wrong :-((
1295                  */
1296                 mod_timer(&fd_timer, jiffies + 5);
1297         else
1298                 start_check_change_timer();
1299         start_motor_off_timer();
1300
1301         local_irq_save(flags);
1302         stdma_release();
1303         fdc_busy = 0;
1304         wake_up( &fdc_wait );
1305         local_irq_restore(flags);
1306
1307         DPRINT(("finish_fdc() finished\n"));
1308 }
1309
1310 /* The detection of disk changes is a dark chapter in Atari history :-(
1311  * Because the "Drive ready" signal isn't present in the Atari
1312  * hardware, one has to rely on the "Write Protect". This works fine,
1313  * as long as no write protected disks are used. TOS solves this
1314  * problem by introducing tri-state logic ("maybe changed") and
1315  * looking at the serial number in block 0. This isn't possible for
1316  * Linux, since the floppy driver can't make assumptions about the
1317  * filesystem used on the disk and thus the contents of block 0. I've
1318  * chosen the method to always say "The disk was changed" if it is
1319  * unsure whether it was. This implies that every open or mount
1320  * invalidates the disk buffers if you work with write protected
1321  * disks. But at least this is better than working with incorrect data
1322  * due to unrecognised disk changes.
1323  */
1324
1325 static int check_floppy_change(struct gendisk *disk)
1326 {
1327         struct atari_floppy_struct *p = disk->private_data;
1328         unsigned int drive = p - unit;
1329         if (test_bit (drive, &fake_change)) {
1330                 /* simulated change (e.g. after formatting) */
1331                 return 1;
1332         }
1333         if (test_bit (drive, &changed_floppies)) {
1334                 /* surely changed (the WP signal changed at least once) */
1335                 return 1;
1336         }
1337         if (UD.wpstat) {
1338                 /* WP is on -> could be changed: to be sure, buffers should be
1339                  * invalidated...
1340                  */
1341                 return 1;
1342         }
1343
1344         return 0;
1345 }
1346
1347 static int floppy_revalidate(struct gendisk *disk)
1348 {
1349         struct atari_floppy_struct *p = disk->private_data;
1350         unsigned int drive = p - unit;
1351
1352         if (test_bit(drive, &changed_floppies) ||
1353             test_bit(drive, &fake_change) ||
1354             p->disktype == 0) {
1355                 if (UD.flags & FTD_MSG)
1356                         printk(KERN_ERR "floppy: clear format %p!\n", UDT);
1357                 BufferDrive = -1;
1358                 clear_bit(drive, &fake_change);
1359                 clear_bit(drive, &changed_floppies);
1360                 /* MSch: clearing geometry makes sense only for autoprobe
1361                    formats, for 'permanent user-defined' parameter:
1362                    restore default_params[] here if flagged valid! */
1363                 if (default_params[drive].blocks == 0)
1364                         UDT = NULL;
1365                 else
1366                         UDT = &default_params[drive];
1367         }
1368         return 0;
1369 }
1370
1371
1372 /* This sets up the global variables describing the current request. */
1373
1374 static void setup_req_params( int drive )
1375 {
1376         int block = ReqBlock + ReqCnt;
1377
1378         ReqTrack = block / UDT->spt;
1379         ReqSector = block - ReqTrack * UDT->spt + 1;
1380         ReqSide = ReqTrack & 1;
1381         ReqTrack >>= 1;
1382         ReqData = ReqBuffer + 512 * ReqCnt;
1383
1384         if (UseTrackbuffer)
1385                 read_track = (ReqCmd == READ && CURRENT->errors == 0);
1386         else
1387                 read_track = 0;
1388
1389         DPRINT(("Request params: Si=%d Tr=%d Se=%d Data=%08lx\n",ReqSide,
1390                         ReqTrack, ReqSector, (unsigned long)ReqData ));
1391 }
1392
1393
1394 static void redo_fd_request(void)
1395 {
1396         int drive, type;
1397         struct atari_floppy_struct *floppy;
1398
1399         DPRINT(("redo_fd_request: CURRENT=%p dev=%s CURRENT->sector=%ld\n",
1400                 CURRENT, CURRENT ? CURRENT->rq_disk->disk_name : "",
1401                 CURRENT ? CURRENT->sector : 0 ));
1402
1403         IsFormatting = 0;
1404
1405 repeat:
1406
1407         if (!CURRENT)
1408                 goto the_end;
1409
1410         floppy = CURRENT->rq_disk->private_data;
1411         drive = floppy - unit;
1412         type = floppy->type;
1413
1414         if (!UD.connected) {
1415                 /* drive not connected */
1416                 printk(KERN_ERR "Unknown Device: fd%d\n", drive );
1417                 end_request(CURRENT, 0);
1418                 goto repeat;
1419         }
1420
1421         if (type == 0) {
1422                 if (!UDT) {
1423                         Probing = 1;
1424                         UDT = atari_disk_type + StartDiskType[DriveType];
1425                         set_capacity(floppy->disk, UDT->blocks);
1426                         UD.autoprobe = 1;
1427                 }
1428         }
1429         else {
1430                 /* user supplied disk type */
1431                 if (--type >= NUM_DISK_MINORS) {
1432                         printk(KERN_WARNING "fd%d: invalid disk format", drive );
1433                         end_request(CURRENT, 0);
1434                         goto repeat;
1435                 }
1436                 if (minor2disktype[type].drive_types > DriveType)  {
1437                         printk(KERN_WARNING "fd%d: unsupported disk format", drive );
1438                         end_request(CURRENT, 0);
1439                         goto repeat;
1440                 }
1441                 type = minor2disktype[type].index;
1442                 UDT = &atari_disk_type[type];
1443                 set_capacity(floppy->disk, UDT->blocks);
1444                 UD.autoprobe = 0;
1445         }
1446
1447         if (CURRENT->sector + 1 > UDT->blocks) {
1448                 end_request(CURRENT, 0);
1449                 goto repeat;
1450         }
1451
1452         /* stop deselect timer */
1453         del_timer( &motor_off_timer );
1454
1455         ReqCnt = 0;
1456         ReqCmd = rq_data_dir(CURRENT);
1457         ReqBlock = CURRENT->sector;
1458         ReqBuffer = CURRENT->buffer;
1459         setup_req_params( drive );
1460         do_fd_action( drive );
1461
1462         return;
1463
1464   the_end:
1465         finish_fdc();
1466 }
1467
1468
1469 void do_fd_request(struct request_queue * q)
1470 {
1471         unsigned long flags;
1472
1473         DPRINT(("do_fd_request for pid %d\n",current->pid));
1474         while( fdc_busy ) sleep_on( &fdc_wait );
1475         fdc_busy = 1;
1476         stdma_lock(floppy_irq, NULL);
1477
1478         atari_disable_irq( IRQ_MFP_FDC );
1479         local_save_flags(flags);        /* The request function is called with ints
1480         local_irq_disable();             * disabled... so must save the IPL for later */
1481         redo_fd_request();
1482         local_irq_restore(flags);
1483         atari_enable_irq( IRQ_MFP_FDC );
1484 }
1485
1486 static int fd_ioctl(struct block_device *bdev, fmode_t mode,
1487                     unsigned int cmd, unsigned long param)
1488 {
1489         struct gendisk *disk = bdev->bd_disk;
1490         struct atari_floppy_struct *floppy = disk->private_data;
1491         int drive = floppy - unit;
1492         int type = floppy->type;
1493         struct atari_format_descr fmt_desc;
1494         struct atari_disk_type *dtp;
1495         struct floppy_struct getprm;
1496         int settype;
1497         struct floppy_struct setprm;
1498         void __user *argp = (void __user *)param;
1499
1500         switch (cmd) {
1501         case FDGETPRM:
1502                 if (type) {
1503                         if (--type >= NUM_DISK_MINORS)
1504                                 return -ENODEV;
1505                         if (minor2disktype[type].drive_types > DriveType)
1506                                 return -ENODEV;
1507                         type = minor2disktype[type].index;
1508                         dtp = &atari_disk_type[type];
1509                         if (UD.flags & FTD_MSG)
1510                             printk (KERN_ERR "floppy%d: found dtp %p name %s!\n",
1511                                 drive, dtp, dtp->name);
1512                 }
1513                 else {
1514                         if (!UDT)
1515                                 return -ENXIO;
1516                         else
1517                                 dtp = UDT;
1518                 }
1519                 memset((void *)&getprm, 0, sizeof(getprm));
1520                 getprm.size = dtp->blocks;
1521                 getprm.sect = dtp->spt;
1522                 getprm.head = 2;
1523                 getprm.track = dtp->blocks/dtp->spt/2;
1524                 getprm.stretch = dtp->stretch;
1525                 if (copy_to_user(argp, &getprm, sizeof(getprm)))
1526                         return -EFAULT;
1527                 return 0;
1528         }
1529         switch (cmd) {
1530         case FDSETPRM:
1531         case FDDEFPRM:
1532                 /*
1533                  * MSch 7/96: simple 'set geometry' case: just set the
1534                  * 'default' device params (minor == 0).
1535                  * Currently, the drive geometry is cleared after each
1536                  * disk change and subsequent revalidate()! simple
1537                  * implementation of FDDEFPRM: save geometry from a
1538                  * FDDEFPRM call and restore it in floppy_revalidate() !
1539                  */
1540
1541                 /* get the parameters from user space */
1542                 if (floppy->ref != 1 && floppy->ref != -1)
1543                         return -EBUSY;
1544                 if (copy_from_user(&setprm, argp, sizeof(setprm)))
1545                         return -EFAULT;
1546                 /*
1547                  * first of all: check for floppy change and revalidate,
1548                  * or the next access will revalidate - and clear UDT :-(
1549                  */
1550
1551                 if (check_floppy_change(disk))
1552                         floppy_revalidate(disk);
1553
1554                 if (UD.flags & FTD_MSG)
1555                     printk (KERN_INFO "floppy%d: setting size %d spt %d str %d!\n",
1556                         drive, setprm.size, setprm.sect, setprm.stretch);
1557
1558                 /* what if type > 0 here? Overwrite specified entry ? */
1559                 if (type) {
1560                         /* refuse to re-set a predefined type for now */
1561                         redo_fd_request();
1562                         return -EINVAL;
1563                 }
1564
1565                 /*
1566                  * type == 0: first look for a matching entry in the type list,
1567                  * and set the UD.disktype field to use the perdefined entry.
1568                  * TODO: add user-defined format to head of autoprobe list ?
1569                  * Useful to include the user-type for future autodetection!
1570                  */
1571
1572                 for (settype = 0; settype < NUM_DISK_MINORS; settype++) {
1573                         int setidx = 0;
1574                         if (minor2disktype[settype].drive_types > DriveType) {
1575                                 /* skip this one, invalid for drive ... */
1576                                 continue;
1577                         }
1578                         setidx = minor2disktype[settype].index;
1579                         dtp = &atari_disk_type[setidx];
1580
1581                         /* found matching entry ?? */
1582                         if (   dtp->blocks  == setprm.size
1583                             && dtp->spt     == setprm.sect
1584                             && dtp->stretch == setprm.stretch ) {
1585                                 if (UD.flags & FTD_MSG)
1586                                     printk (KERN_INFO "floppy%d: setting %s %p!\n",
1587                                         drive, dtp->name, dtp);
1588                                 UDT = dtp;
1589                                 set_capacity(floppy->disk, UDT->blocks);
1590
1591                                 if (cmd == FDDEFPRM) {
1592                                   /* save settings as permanent default type */
1593                                   default_params[drive].name    = dtp->name;
1594                                   default_params[drive].spt     = dtp->spt;
1595                                   default_params[drive].blocks  = dtp->blocks;
1596                                   default_params[drive].fdc_speed = dtp->fdc_speed;
1597                                   default_params[drive].stretch = dtp->stretch;
1598                                 }
1599
1600                                 return 0;
1601                         }
1602
1603                 }
1604
1605                 /* no matching disk type found above - setting user_params */
1606
1607                 if (cmd == FDDEFPRM) {
1608                         /* set permanent type */
1609                         dtp = &default_params[drive];
1610                 } else
1611                         /* set user type (reset by disk change!) */
1612                         dtp = &user_params[drive];
1613
1614                 dtp->name   = "user format";
1615                 dtp->blocks = setprm.size;
1616                 dtp->spt    = setprm.sect;
1617                 if (setprm.sect > 14)
1618                         dtp->fdc_speed = 3;
1619                 else
1620                         dtp->fdc_speed = 0;
1621                 dtp->stretch = setprm.stretch;
1622
1623                 if (UD.flags & FTD_MSG)
1624                         printk (KERN_INFO "floppy%d: blk %d spt %d str %d!\n",
1625                                 drive, dtp->blocks, dtp->spt, dtp->stretch);
1626
1627                 /* sanity check */
1628                 if (!dtp || setprm.track != dtp->blocks/dtp->spt/2 ||
1629                     setprm.head != 2) {
1630                         redo_fd_request();
1631                         return -EINVAL;
1632                 }
1633
1634                 UDT = dtp;
1635                 set_capacity(floppy->disk, UDT->blocks);
1636
1637                 return 0;
1638         case FDMSGON:
1639                 UD.flags |= FTD_MSG;
1640                 return 0;
1641         case FDMSGOFF:
1642                 UD.flags &= ~FTD_MSG;
1643                 return 0;
1644         case FDSETEMSGTRESH:
1645                 return -EINVAL;
1646         case FDFMTBEG:
1647                 return 0;
1648         case FDFMTTRK:
1649                 if (floppy->ref != 1 && floppy->ref != -1)
1650                         return -EBUSY;
1651                 if (copy_from_user(&fmt_desc, argp, sizeof(fmt_desc)))
1652                         return -EFAULT;
1653                 return do_format(drive, type, &fmt_desc);
1654         case FDCLRPRM:
1655                 UDT = NULL;
1656                 /* MSch: invalidate default_params */
1657                 default_params[drive].blocks  = 0;
1658                 set_capacity(floppy->disk, MAX_DISK_SIZE * 2);
1659         case FDFMTEND:
1660         case FDFLUSH:
1661                 /* invalidate the buffer track to force a reread */
1662                 BufferDrive = -1;
1663                 set_bit(drive, &fake_change);
1664                 check_disk_change(bdev);
1665                 return 0;
1666         default:
1667                 return -EINVAL;
1668         }
1669 }
1670
1671
1672 /* Initialize the 'unit' variable for drive 'drive' */
1673
1674 static void __init fd_probe( int drive )
1675 {
1676         UD.connected = 0;
1677         UDT  = NULL;
1678
1679         if (!fd_test_drive_present( drive ))
1680                 return;
1681
1682         UD.connected = 1;
1683         UD.track     = 0;
1684         switch( UserSteprate[drive] ) {
1685         case 2:
1686                 UD.steprate = FDCSTEP_2;
1687                 break;
1688         case 3:
1689                 UD.steprate = FDCSTEP_3;
1690                 break;
1691         case 6:
1692                 UD.steprate = FDCSTEP_6;
1693                 break;
1694         case 12:
1695                 UD.steprate = FDCSTEP_12;
1696                 break;
1697         default: /* should be -1 for "not set by user" */
1698                 if (ATARIHW_PRESENT( FDCSPEED ) || MACH_IS_MEDUSA)
1699                         UD.steprate = FDCSTEP_3;
1700                 else
1701                         UD.steprate = FDCSTEP_6;
1702                 break;
1703         }
1704         MotorOn = 1;    /* from probe restore operation! */
1705 }
1706
1707
1708 /* This function tests the physical presence of a floppy drive (not
1709  * whether a disk is inserted). This is done by issuing a restore
1710  * command, waiting max. 2 seconds (that should be enough to move the
1711  * head across the whole disk) and looking at the state of the "TR00"
1712  * signal. This should now be raised if there is a drive connected
1713  * (and there is no hardware failure :-) Otherwise, the drive is
1714  * declared absent.
1715  */
1716
1717 static int __init fd_test_drive_present( int drive )
1718 {
1719         unsigned long timeout;
1720         unsigned char status;
1721         int ok;
1722
1723         if (drive >= (MACH_IS_FALCON ? 1 : 2)) return( 0 );
1724         fd_select_drive( drive );
1725
1726         /* disable interrupt temporarily */
1727         atari_turnoff_irq( IRQ_MFP_FDC );
1728         FDC_WRITE (FDCREG_TRACK, 0xff00);
1729         FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | FDCCMDADD_H | FDCSTEP_6 );
1730
1731         timeout = jiffies + 2*HZ+HZ/2;
1732         while (time_before(jiffies, timeout))
1733                 if (!(st_mfp.par_dt_reg & 0x20))
1734                         break;
1735
1736         status = FDC_READ( FDCREG_STATUS );
1737         ok = (status & FDCSTAT_TR00) != 0;
1738
1739         /* force interrupt to abort restore operation (FDC would try
1740          * about 50 seconds!) */
1741         FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1742         udelay(500);
1743         status = FDC_READ( FDCREG_STATUS );
1744         udelay(20);
1745
1746         if (ok) {
1747                 /* dummy seek command to make WP bit accessible */
1748                 FDC_WRITE( FDCREG_DATA, 0 );
1749                 FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK );
1750                 while( st_mfp.par_dt_reg & 0x20 )
1751                         ;
1752                 status = FDC_READ( FDCREG_STATUS );
1753         }
1754
1755         atari_turnon_irq( IRQ_MFP_FDC );
1756         return( ok );
1757 }
1758
1759
1760 /* Look how many and which kind of drives are connected. If there are
1761  * floppies, additionally start the disk-change and motor-off timers.
1762  */
1763
1764 static void __init config_types( void )
1765 {
1766         int drive, cnt = 0;
1767
1768         /* for probing drives, set the FDC speed to 8 MHz */
1769         if (ATARIHW_PRESENT(FDCSPEED))
1770                 dma_wd.fdc_speed = 0;
1771
1772         printk(KERN_INFO "Probing floppy drive(s):\n");
1773         for( drive = 0; drive < FD_MAX_UNITS; drive++ ) {
1774                 fd_probe( drive );
1775                 if (UD.connected) {
1776                         printk(KERN_INFO "fd%d\n", drive);
1777                         ++cnt;
1778                 }
1779         }
1780
1781         if (FDC_READ( FDCREG_STATUS ) & FDCSTAT_BUSY) {
1782                 /* If FDC is still busy from probing, give it another FORCI
1783                  * command to abort the operation. If this isn't done, the FDC
1784                  * will interrupt later and its IRQ line stays low, because
1785                  * the status register isn't read. And this will block any
1786                  * interrupts on this IRQ line :-(
1787                  */
1788                 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1789                 udelay(500);
1790                 FDC_READ( FDCREG_STATUS );
1791                 udelay(20);
1792         }
1793
1794         if (cnt > 0) {
1795                 start_motor_off_timer();
1796                 if (cnt == 1) fd_select_drive( 0 );
1797                 start_check_change_timer();
1798         }
1799 }
1800
1801 /*
1802  * floppy_open check for aliasing (/dev/fd0 can be the same as
1803  * /dev/PS0 etc), and disallows simultaneous access to the same
1804  * drive with different device numbers.
1805  */
1806
1807 static int floppy_open(struct block_device *bdev, fmode_t mode)
1808 {
1809         struct atari_floppy_struct *p = bdev->bd_disk->private_data;
1810         int type  = MINOR(bdev->bd_dev) >> 2;
1811
1812         DPRINT(("fd_open: type=%d\n",type));
1813         if (p->ref && p->type != type)
1814                 return -EBUSY;
1815
1816         if (p->ref == -1 || (p->ref && mode & FMODE_EXCL))
1817                 return -EBUSY;
1818
1819         if (mode & FMODE_EXCL)
1820                 p->ref = -1;
1821         else
1822                 p->ref++;
1823
1824         p->type = type;
1825
1826         if (mode & FMODE_NDELAY)
1827                 return 0;
1828
1829         if (mode & (FMODE_READ|FMODE_WRITE)) {
1830                 check_disk_change(bdev);
1831                 if (mode & FMODE_WRITE) {
1832                         if (p->wpstat) {
1833                                 if (p->ref < 0)
1834                                         p->ref = 0;
1835                                 else
1836                                         p->ref--;
1837                                 return -EROFS;
1838                         }
1839                 }
1840         }
1841         return 0;
1842 }
1843
1844
1845 static int floppy_release(struct gendisk *disk, fmode_t mode)
1846 {
1847         struct atari_floppy_struct *p = disk->private_data;
1848         if (p->ref < 0)
1849                 p->ref = 0;
1850         else if (!p->ref--) {
1851                 printk(KERN_ERR "floppy_release with fd_ref == 0");
1852                 p->ref = 0;
1853         }
1854         return 0;
1855 }
1856
1857 static struct block_device_operations floppy_fops = {
1858         .owner          = THIS_MODULE,
1859         .open           = floppy_open,
1860         .release        = floppy_release,
1861         .locked_ioctl   = fd_ioctl,
1862         .media_changed  = check_floppy_change,
1863         .revalidate_disk= floppy_revalidate,
1864 };
1865
1866 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
1867 {
1868         int drive = *part & 3;
1869         int type  = *part >> 2;
1870         if (drive >= FD_MAX_UNITS || type > NUM_DISK_MINORS)
1871                 return NULL;
1872         *part = 0;
1873         return get_disk(unit[drive].disk);
1874 }
1875
1876 static int __init atari_floppy_init (void)
1877 {
1878         int i;
1879
1880         if (!MACH_IS_ATARI)
1881                 /* Amiga, Mac, ... don't have Atari-compatible floppy :-) */
1882                 return -ENODEV;
1883
1884         if (register_blkdev(FLOPPY_MAJOR,"fd"))
1885                 return -EBUSY;
1886
1887         for (i = 0; i < FD_MAX_UNITS; i++) {
1888                 unit[i].disk = alloc_disk(1);
1889                 if (!unit[i].disk)
1890                         goto Enomem;
1891         }
1892
1893         if (UseTrackbuffer < 0)
1894                 /* not set by user -> use default: for now, we turn
1895                    track buffering off for all Medusas, though it
1896                    could be used with ones that have a counter
1897                    card. But the test is too hard :-( */
1898                 UseTrackbuffer = !MACH_IS_MEDUSA;
1899
1900         /* initialize variables */
1901         SelectedDrive = -1;
1902         BufferDrive = -1;
1903
1904         DMABuffer = atari_stram_alloc(BUFFER_SIZE+512, "ataflop");
1905         if (!DMABuffer) {
1906                 printk(KERN_ERR "atari_floppy_init: cannot get dma buffer\n");
1907                 goto Enomem;
1908         }
1909         TrackBuffer = DMABuffer + 512;
1910         PhysDMABuffer = virt_to_phys(DMABuffer);
1911         PhysTrackBuffer = virt_to_phys(TrackBuffer);
1912         BufferDrive = BufferSide = BufferTrack = -1;
1913
1914         floppy_queue = blk_init_queue(do_fd_request, &ataflop_lock);
1915         if (!floppy_queue)
1916                 goto Enomem;
1917
1918         for (i = 0; i < FD_MAX_UNITS; i++) {
1919                 unit[i].track = -1;
1920                 unit[i].flags = 0;
1921                 unit[i].disk->major = FLOPPY_MAJOR;
1922                 unit[i].disk->first_minor = i;
1923                 sprintf(unit[i].disk->disk_name, "fd%d", i);
1924                 unit[i].disk->fops = &floppy_fops;
1925                 unit[i].disk->private_data = &unit[i];
1926                 unit[i].disk->queue = floppy_queue;
1927                 set_capacity(unit[i].disk, MAX_DISK_SIZE * 2);
1928                 add_disk(unit[i].disk);
1929         }
1930
1931         blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
1932                                 floppy_find, NULL, NULL);
1933
1934         printk(KERN_INFO "Atari floppy driver: max. %cD, %strack buffering\n",
1935                DriveType == 0 ? 'D' : DriveType == 1 ? 'H' : 'E',
1936                UseTrackbuffer ? "" : "no ");
1937         config_types();
1938
1939         return 0;
1940 Enomem:
1941         while (i--)
1942                 put_disk(unit[i].disk);
1943         if (floppy_queue)
1944                 blk_cleanup_queue(floppy_queue);
1945         unregister_blkdev(FLOPPY_MAJOR, "fd");
1946         return -ENOMEM;
1947 }
1948
1949 #ifndef MODULE
1950 static int __init atari_floppy_setup(char *str)
1951 {
1952         int ints[3 + FD_MAX_UNITS];
1953         int i;
1954
1955         if (!MACH_IS_ATARI)
1956                 return 0;
1957
1958         str = get_options(str, 3 + FD_MAX_UNITS, ints);
1959
1960         if (ints[0] < 1) {
1961                 printk(KERN_ERR "ataflop_setup: no arguments!\n" );
1962                 return 0;
1963         }
1964         else if (ints[0] > 2+FD_MAX_UNITS) {
1965                 printk(KERN_ERR "ataflop_setup: too many arguments\n" );
1966         }
1967
1968         if (ints[1] < 0 || ints[1] > 2)
1969                 printk(KERN_ERR "ataflop_setup: bad drive type\n" );
1970         else
1971                 DriveType = ints[1];
1972
1973         if (ints[0] >= 2)
1974                 UseTrackbuffer = (ints[2] > 0);
1975
1976         for( i = 3; i <= ints[0] && i-3 < FD_MAX_UNITS; ++i ) {
1977                 if (ints[i] != 2 && ints[i] != 3 && ints[i] != 6 && ints[i] != 12)
1978                         printk(KERN_ERR "ataflop_setup: bad steprate\n" );
1979                 else
1980                         UserSteprate[i-3] = ints[i];
1981         }
1982         return 1;
1983 }
1984
1985 __setup("floppy=", atari_floppy_setup);
1986 #endif
1987
1988 static void __exit atari_floppy_exit(void)
1989 {
1990         int i;
1991         blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
1992         for (i = 0; i < FD_MAX_UNITS; i++) {
1993                 del_gendisk(unit[i].disk);
1994                 put_disk(unit[i].disk);
1995         }
1996         unregister_blkdev(FLOPPY_MAJOR, "fd");
1997
1998         blk_cleanup_queue(floppy_queue);
1999         del_timer_sync(&fd_timer);
2000         atari_stram_free( DMABuffer );
2001 }
2002
2003 module_init(atari_floppy_init)
2004 module_exit(atari_floppy_exit)
2005
2006 MODULE_LICENSE("GPL");