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 #include <linux/mutex.h>
  71
  72 #include <asm/atafd.h>
  73 #include <asm/atafdreg.h>
  74 #include <asm/atariints.h>
  75 #include <asm/atari_stdma.h>
  76 #include <asm/atari_stram.h>
  77
  78 #define FD_MAX_UNITS 2
  79
  80 #undef DEBUG
  81
  82 static DEFINE_MUTEX(ataflop_mutex);
  83 static struct request *fd_request;
  84 static int fdc_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_locked_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 void fd_end_request_cur(int err)
 380 {
 381         if (!__blk_end_request_cur(fd_request, err))
 382                 fd_request = NULL;
 383 }
 384
 385 static inline void start_motor_off_timer(void)
 386 {
 387         mod_timer(&motor_off_timer, jiffies + FD_MOTOR_OFF_DELAY);
 388         MotorOffTrys = 0;
 389 }
 390
 391 static inline void start_check_change_timer( void )
 392 {
 393         mod_timer(&fd_timer, jiffies + CHECK_CHANGE_DELAY);
 394 }
 395
 396 static inline void start_timeout(void)
 397 {
 398         mod_timer(&timeout_timer, jiffies + FLOPPY_TIMEOUT);
 399 }
 400
 401 static inline void stop_timeout(void)
 402 {
 403         del_timer(&timeout_timer);
 404 }
 405
 406 /* Select the side to use. */
 407
 408 static void fd_select_side( int side )
 409 {
 410         unsigned long flags;
 411
 412         /* protect against various other ints mucking around with the PSG */
 413         local_irq_save(flags);
 414
 415         sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
 416         sound_ym.wd_data = (side == 0) ? sound_ym.rd_data_reg_sel | 0x01 :
 417                                          sound_ym.rd_data_reg_sel & 0xfe;
 418
 419         local_irq_restore(flags);
 420 }
 421
 422
 423 /* Select a drive, update the FDC's track register and set the correct
 424  * clock speed for this disk's type.
 425  */
 426
 427 static void fd_select_drive( int drive )
 428 {
 429         unsigned long flags;
 430         unsigned char tmp;
 431
 432         if (drive == SelectedDrive)
 433           return;
 434
 435         /* protect against various other ints mucking around with the PSG */
 436         local_irq_save(flags);
 437         sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
 438         tmp = sound_ym.rd_data_reg_sel;
 439         sound_ym.wd_data = (tmp | DSKDRVNONE) & ~(drive == 0 ? DSKDRV0 : DSKDRV1);
 440         atari_dont_touch_floppy_select = 1;
 441         local_irq_restore(flags);
 442
 443         /* restore track register to saved value */
 444         FDC_WRITE( FDCREG_TRACK, UD.track );
 445         udelay(25);
 446
 447         /* select 8/16 MHz */
 448         if (UDT)
 449                 if (ATARIHW_PRESENT(FDCSPEED))
 450                         dma_wd.fdc_speed = UDT->fdc_speed;
 451
 452         SelectedDrive = drive;
 453 }
 454
 455
 456 /* Deselect both drives. */
 457
 458 static void fd_deselect( void )
 459 {
 460         unsigned long flags;
 461
 462         /* protect against various other ints mucking around with the PSG */
 463         local_irq_save(flags);
 464         atari_dont_touch_floppy_select = 0;
 465         sound_ym.rd_data_reg_sel=14;    /* Select PSG Port A */
 466         sound_ym.wd_data = (sound_ym.rd_data_reg_sel |
 467                             (MACH_IS_FALCON ? 3 : 7)); /* no drives selected */
 468         /* On Falcon, the drive B select line is used on the printer port, so
 469          * leave it alone... */
 470         SelectedDrive = -1;
 471         local_irq_restore(flags);
 472 }
 473
 474
 475 /* This timer function deselects the drives when the FDC switched the
 476  * motor off. The deselection cannot happen earlier because the FDC
 477  * counts the index signals, which arrive only if one drive is selected.
 478  */
 479
 480 static void fd_motor_off_timer( unsigned long dummy )
 481 {
 482         unsigned char status;
 483
 484         if (SelectedDrive < 0)
 485                 /* no drive selected, needn't deselect anyone */
 486                 return;
 487
 488         if (stdma_islocked())
 489                 goto retry;
 490
 491         status = FDC_READ( FDCREG_STATUS );
 492
 493         if (!(status & 0x80)) {
 494                 /* motor already turned off by FDC -> deselect drives */
 495                 MotorOn = 0;
 496                 fd_deselect();
 497                 return;
 498         }
 499         /* not yet off, try again */
 500
 501   retry:
 502         /* Test again later; if tested too often, it seems there is no disk
 503          * in the drive and the FDC will leave the motor on forever (or,
 504          * at least until a disk is inserted). So we'll test only twice
 505          * per second from then on...
 506          */
 507         mod_timer(&motor_off_timer,
 508                   jiffies + (MotorOffTrys++ < FD_MOTOR_OFF_MAXTRY ? HZ/20 : HZ/2));
 509 }
 510
 511
 512 /* This function is repeatedly called to detect disk changes (as good
 513  * as possible) and keep track of the current state of the write protection.
 514  */
 515
 516 static void check_change( unsigned long dummy )
 517 {
 518         static int    drive = 0;
 519
 520         unsigned long flags;
 521         unsigned char old_porta;
 522         int                       stat;
 523
 524         if (++drive > 1 || !UD.connected)
 525                 drive = 0;
 526
 527         /* protect against various other ints mucking around with the PSG */
 528         local_irq_save(flags);
 529
 530         if (!stdma_islocked()) {
 531                 sound_ym.rd_data_reg_sel = 14;
 532                 old_porta = sound_ym.rd_data_reg_sel;
 533                 sound_ym.wd_data = (old_porta | DSKDRVNONE) &
 534                                        ~(drive == 0 ? DSKDRV0 : DSKDRV1);
 535                 stat = !!(FDC_READ( FDCREG_STATUS ) & FDCSTAT_WPROT);
 536                 sound_ym.wd_data = old_porta;
 537
 538                 if (stat != UD.wpstat) {
 539                         DPRINT(( "wpstat[%d] = %d\n", drive, stat ));
 540                         UD.wpstat = stat;
 541                         set_bit (drive, &changed_floppies);
 542                 }
 543         }
 544         local_irq_restore(flags);
 545
 546         start_check_change_timer();
 547 }
 548
 549
 550 /* Handling of the Head Settling Flag: This flag should be set after each
 551  * seek operation, because we don't use seeks with verify.
 552  */
 553
 554 static inline void set_head_settle_flag(void)
 555 {
 556         HeadSettleFlag = FDCCMDADD_E;
 557 }
 558
 559 static inline int get_head_settle_flag(void)
 560 {
 561         int     tmp = HeadSettleFlag;
 562         HeadSettleFlag = 0;
 563         return( tmp );
 564 }
 565
 566 static inline void copy_buffer(void *from, void *to)
 567 {
 568         ulong *p1 = (ulong *)from, *p2 = (ulong *)to;
 569         int cnt;
 570
 571         for (cnt = 512/4; cnt; cnt--)
 572                 *p2++ = *p1++;
 573 }
 574
 575
 576
 577
 578 /* General Interrupt Handling */
 579
 580 static void (*FloppyIRQHandler)( int status ) = NULL;
 581
 582 static irqreturn_t floppy_irq (int irq, void *dummy)
 583 {
 584         unsigned char status;
 585         void (*handler)( int );
 586
 587         handler = xchg(&FloppyIRQHandler, NULL);
 588
 589         if (handler) {
 590                 nop();
 591                 status = FDC_READ( FDCREG_STATUS );
 592                 DPRINT(("FDC irq, status = %02x handler = %08lx\n",status,(unsigned long)handler));
 593                 handler( status );
 594         }
 595         else {
 596                 DPRINT(("FDC irq, no handler\n"));
 597         }
 598         return IRQ_HANDLED;
 599 }
 600
 601
 602 /* Error handling: If some error happened, retry some times, then
 603  * recalibrate, then try again, and fail after MAX_ERRORS.
 604  */
 605
 606 static void fd_error( void )
 607 {
 608         if (IsFormatting) {
 609                 IsFormatting = 0;
 610                 FormatError = 1;
 611                 wake_up( &format_wait );
 612                 return;
 613         }
 614
 615         if (!fd_request)
 616                 return;
 617
 618         fd_request->errors++;
 619         if (fd_request->errors >= MAX_ERRORS) {
 620                 printk(KERN_ERR "fd%d: too many errors.\n", SelectedDrive );
 621                 fd_end_request_cur(-EIO);
 622         }
 623         else if (fd_request->errors == RECALIBRATE_ERRORS) {
 624                 printk(KERN_WARNING "fd%d: recalibrating\n", SelectedDrive );
 625                 if (SelectedDrive != -1)
 626                         SUD.track = -1;
 627         }
 628         redo_fd_request();
 629 }
 630
 631
 632
 633 #define SET_IRQ_HANDLER(proc) do { FloppyIRQHandler = (proc); } while(0)
 634
 635
 636 /* ---------- Formatting ---------- */
 637
 638 #define FILL(n,val)             \
 639     do {                        \
 640         memset( p, val, n );    \
 641         p += n;                 \
 642     } while(0)
 643
 644 static int do_format(int drive, int type, struct atari_format_descr *desc)
 645 {
 646         unsigned char   *p;
 647         int sect, nsect;
 648         unsigned long   flags;
 649
 650         DPRINT(("do_format( dr=%d tr=%d he=%d offs=%d )\n",
 651                 drive, desc->track, desc->head, desc->sect_offset ));
 652
 653         local_irq_save(flags);
 654         while( fdc_busy ) sleep_on( &fdc_wait );
 655         fdc_busy = 1;
 656         stdma_lock(floppy_irq, NULL);
 657         atari_turnon_irq( IRQ_MFP_FDC ); /* should be already, just to be sure */
 658         local_irq_restore(flags);
 659
 660         if (type) {
 661                 if (--type >= NUM_DISK_MINORS ||
 662                     minor2disktype[type].drive_types > DriveType) {
 663                         redo_fd_request();
 664                         return -EINVAL;
 665                 }
 666                 type = minor2disktype[type].index;
 667                 UDT = &atari_disk_type[type];
 668         }
 669
 670         if (!UDT || desc->track >= UDT->blocks/UDT->spt/2 || desc->head >= 2) {
 671                 redo_fd_request();
 672                 return -EINVAL;
 673         }
 674
 675         nsect = UDT->spt;
 676         p = TrackBuffer;
 677         /* The track buffer is used for the raw track data, so its
 678            contents become invalid! */
 679         BufferDrive = -1;
 680         /* stop deselect timer */
 681         del_timer( &motor_off_timer );
 682
 683         FILL( 60 * (nsect / 9), 0x4e );
 684         for( sect = 0; sect < nsect; ++sect ) {
 685                 FILL( 12, 0 );
 686                 FILL( 3, 0xf5 );
 687                 *p++ = 0xfe;
 688                 *p++ = desc->track;
 689                 *p++ = desc->head;
 690                 *p++ = (nsect + sect - desc->sect_offset) % nsect + 1;
 691                 *p++ = 2;
 692                 *p++ = 0xf7;
 693                 FILL( 22, 0x4e );
 694                 FILL( 12, 0 );
 695                 FILL( 3, 0xf5 );
 696                 *p++ = 0xfb;
 697                 FILL( 512, 0xe5 );
 698                 *p++ = 0xf7;
 699                 FILL( 40, 0x4e );
 700         }
 701         FILL( TrackBuffer+BUFFER_SIZE-p, 0x4e );
 702
 703         IsFormatting = 1;
 704         FormatError = 0;
 705         ReqTrack = desc->track;
 706         ReqSide  = desc->head;
 707         do_fd_action( drive );
 708
 709         sleep_on( &format_wait );
 710
 711         redo_fd_request();
 712         return( FormatError ? -EIO : 0 );
 713 }
 714
 715
 716 /* do_fd_action() is the general procedure for a fd request: All
 717  * required parameter settings (drive select, side select, track
 718  * position) are checked and set if needed. For each of these
 719  * parameters and the actual reading or writing exist two functions:
 720  * one that starts the setting (or skips it if possible) and one
 721  * callback for the "done" interrupt. Each done func calls the next
 722  * set function to propagate the request down to fd_rwsec_done().
 723  */
 724
 725 static void do_fd_action( int drive )
 726 {
 727         DPRINT(("do_fd_action\n"));
 728
 729         if (UseTrackbuffer && !IsFormatting) {
 730         repeat:
 731             if (IS_BUFFERED( drive, ReqSide, ReqTrack )) {
 732                 if (ReqCmd == READ) {
 733                     copy_buffer( SECTOR_BUFFER(ReqSector), ReqData );
 734                     if (++ReqCnt < blk_rq_cur_sectors(fd_request)) {
 735                         /* read next sector */
 736                         setup_req_params( drive );
 737                         goto repeat;
 738                     }
 739                     else {
 740                         /* all sectors finished */
 741                         fd_end_request_cur(0);
 742                         redo_fd_request();
 743                         return;
 744                     }
 745                 }
 746                 else {
 747                     /* cmd == WRITE, pay attention to track buffer
 748                      * consistency! */
 749                     copy_buffer( ReqData, SECTOR_BUFFER(ReqSector) );
 750                 }
 751             }
 752         }
 753
 754         if (SelectedDrive != drive)
 755                 fd_select_drive( drive );
 756
 757         if (UD.track == -1)
 758                 fd_calibrate();
 759         else if (UD.track != ReqTrack << UDT->stretch)
 760                 fd_seek();
 761         else if (IsFormatting)
 762                 fd_writetrack();
 763         else
 764                 fd_rwsec();
 765 }
 766
 767
 768 /* Seek to track 0 if the current track is unknown */
 769
 770 static void fd_calibrate( void )
 771 {
 772         if (SUD.track >= 0) {
 773                 fd_calibrate_done( 0 );
 774                 return;
 775         }
 776
 777         if (ATARIHW_PRESENT(FDCSPEED))
 778                 dma_wd.fdc_speed = 0;   /* always seek with 8 Mhz */;
 779         DPRINT(("fd_calibrate\n"));
 780         SET_IRQ_HANDLER( fd_calibrate_done );
 781         /* we can't verify, since the speed may be incorrect */
 782         FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | SUD.steprate );
 783
 784         NeedSeek = 1;
 785         MotorOn = 1;
 786         start_timeout();
 787         /* wait for IRQ */
 788 }
 789
 790
 791 static void fd_calibrate_done( int status )
 792 {
 793         DPRINT(("fd_calibrate_done()\n"));
 794         stop_timeout();
 795
 796         /* set the correct speed now */
 797         if (ATARIHW_PRESENT(FDCSPEED))
 798                 dma_wd.fdc_speed = SUDT->fdc_speed;
 799         if (status & FDCSTAT_RECNF) {
 800                 printk(KERN_ERR "fd%d: restore failed\n", SelectedDrive );
 801                 fd_error();
 802         }
 803         else {
 804                 SUD.track = 0;
 805                 fd_seek();
 806         }
 807 }
 808
 809
 810 /* Seek the drive to the requested track. The drive must have been
 811  * calibrated at some point before this.
 812  */
 813
 814 static void fd_seek( void )
 815 {
 816         if (SUD.track == ReqTrack << SUDT->stretch) {
 817                 fd_seek_done( 0 );
 818                 return;
 819         }
 820
 821         if (ATARIHW_PRESENT(FDCSPEED)) {
 822                 dma_wd.fdc_speed = 0;   /* always seek witch 8 Mhz */
 823                 MFPDELAY();
 824         }
 825
 826         DPRINT(("fd_seek() to track %d\n",ReqTrack));
 827         FDC_WRITE( FDCREG_DATA, ReqTrack << SUDT->stretch);
 828         udelay(25);
 829         SET_IRQ_HANDLER( fd_seek_done );
 830         FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK | SUD.steprate );
 831
 832         MotorOn = 1;
 833         set_head_settle_flag();
 834         start_timeout();
 835         /* wait for IRQ */
 836 }
 837
 838
 839 static void fd_seek_done( int status )
 840 {
 841         DPRINT(("fd_seek_done()\n"));
 842         stop_timeout();
 843
 844         /* set the correct speed */
 845         if (ATARIHW_PRESENT(FDCSPEED))
 846                 dma_wd.fdc_speed = SUDT->fdc_speed;
 847         if (status & FDCSTAT_RECNF) {
 848                 printk(KERN_ERR "fd%d: seek error (to track %d)\n",
 849                                 SelectedDrive, ReqTrack );
 850                 /* we don't know exactly which track we are on now! */
 851                 SUD.track = -1;
 852                 fd_error();
 853         }
 854         else {
 855                 SUD.track = ReqTrack << SUDT->stretch;
 856                 NeedSeek = 0;
 857                 if (IsFormatting)
 858                         fd_writetrack();
 859                 else
 860                         fd_rwsec();
 861         }
 862 }
 863
 864
 865 /* This does the actual reading/writing after positioning the head
 866  * over the correct track.
 867  */
 868
 869 static int MultReadInProgress = 0;
 870
 871
 872 static void fd_rwsec( void )
 873 {
 874         unsigned long paddr, flags;
 875         unsigned int  rwflag, old_motoron;
 876         unsigned int track;
 877
 878         DPRINT(("fd_rwsec(), Sec=%d, Access=%c\n",ReqSector, ReqCmd == WRITE ? 'w' : 'r' ));
 879         if (ReqCmd == WRITE) {
 880                 if (ATARIHW_PRESENT(EXTD_DMA)) {
 881                         paddr = virt_to_phys(ReqData);
 882                 }
 883                 else {
 884                         copy_buffer( ReqData, DMABuffer );
 885                         paddr = PhysDMABuffer;
 886                 }
 887                 dma_cache_maintenance( paddr, 512, 1 );
 888                 rwflag = 0x100;
 889         }
 890         else {
 891                 if (read_track)
 892                         paddr = PhysTrackBuffer;
 893                 else
 894                         paddr = ATARIHW_PRESENT(EXTD_DMA) ?
 895                                 virt_to_phys(ReqData) : PhysDMABuffer;
 896                 rwflag = 0;
 897         }
 898
 899         fd_select_side( ReqSide );
 900
 901         /* Start sector of this operation */
 902         FDC_WRITE( FDCREG_SECTOR, read_track ? 1 : ReqSector );
 903         MFPDELAY();
 904         /* Cheat for track if stretch != 0 */
 905         if (SUDT->stretch) {
 906                 track = FDC_READ( FDCREG_TRACK);
 907                 MFPDELAY();
 908                 FDC_WRITE( FDCREG_TRACK, track >> SUDT->stretch);
 909         }
 910         udelay(25);
 911
 912         /* Setup DMA */
 913         local_irq_save(flags);
 914         dma_wd.dma_lo = (unsigned char)paddr;
 915         MFPDELAY();
 916         paddr >>= 8;
 917         dma_wd.dma_md = (unsigned char)paddr;
 918         MFPDELAY();
 919         paddr >>= 8;
 920         if (ATARIHW_PRESENT(EXTD_DMA))
 921                 st_dma_ext_dmahi = (unsigned short)paddr;
 922         else
 923                 dma_wd.dma_hi = (unsigned char)paddr;
 924         MFPDELAY();
 925         local_irq_restore(flags);
 926
 927         /* Clear FIFO and switch DMA to correct mode */
 928         dma_wd.dma_mode_status = 0x90 | rwflag;
 929         MFPDELAY();
 930         dma_wd.dma_mode_status = 0x90 | (rwflag ^ 0x100);
 931         MFPDELAY();
 932         dma_wd.dma_mode_status = 0x90 | rwflag;
 933         MFPDELAY();
 934
 935         /* How many sectors for DMA */
 936         dma_wd.fdc_acces_seccount = read_track ? SUDT->spt : 1;
 937
 938         udelay(25);
 939
 940         /* Start operation */
 941         dma_wd.dma_mode_status = FDCSELREG_STP | rwflag;
 942         udelay(25);
 943         SET_IRQ_HANDLER( fd_rwsec_done );
 944         dma_wd.fdc_acces_seccount =
 945           (get_head_settle_flag() |
 946            (rwflag ? FDCCMD_WRSEC : (FDCCMD_RDSEC | (read_track ? FDCCMDADD_M : 0))));
 947
 948         old_motoron = MotorOn;
 949         MotorOn = 1;
 950         NeedSeek = 1;
 951         /* wait for interrupt */
 952
 953         if (read_track) {
 954                 /* If reading a whole track, wait about one disk rotation and
 955                  * then check if all sectors are read. The FDC will even
 956                  * search for the first non-existent sector and need 1 sec to
 957                  * recognise that it isn't present :-(
 958                  */
 959                 MultReadInProgress = 1;
 960                 mod_timer(&readtrack_timer,
 961                           /* 1 rot. + 5 rot.s if motor was off  */
 962                           jiffies + HZ/5 + (old_motoron ? 0 : HZ));
 963         }
 964         start_timeout();
 965 }
 966
 967
 968 static void fd_readtrack_check( unsigned long dummy )
 969 {
 970         unsigned long flags, addr, addr2;
 971
 972         local_irq_save(flags);
 973
 974         if (!MultReadInProgress) {
 975                 /* This prevents a race condition that could arise if the
 976                  * interrupt is triggered while the calling of this timer
 977                  * callback function takes place. The IRQ function then has
 978                  * already cleared 'MultReadInProgress'  when flow of control
 979                  * gets here.
 980                  */
 981                 local_irq_restore(flags);
 982                 return;
 983         }
 984
 985         /* get the current DMA address */
 986         /* ++ f.a. read twice to avoid being fooled by switcher */
 987         addr = 0;
 988         do {
 989                 addr2 = addr;
 990                 addr = dma_wd.dma_lo & 0xff;
 991                 MFPDELAY();
 992                 addr |= (dma_wd.dma_md & 0xff) << 8;
 993                 MFPDELAY();
 994                 if (ATARIHW_PRESENT( EXTD_DMA ))
 995                         addr |= (st_dma_ext_dmahi & 0xffff) << 16;
 996                 else
 997                         addr |= (dma_wd.dma_hi & 0xff) << 16;
 998                 MFPDELAY();
 999         } while(addr != addr2);
1000
1001         if (addr >= PhysTrackBuffer + SUDT->spt*512) {
1002                 /* already read enough data, force an FDC interrupt to stop
1003                  * the read operation
1004                  */
1005                 SET_IRQ_HANDLER( NULL );
1006                 MultReadInProgress = 0;
1007                 local_irq_restore(flags);
1008                 DPRINT(("fd_readtrack_check(): done\n"));
1009                 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1010                 udelay(25);
1011
1012                 /* No error until now -- the FDC would have interrupted
1013                  * otherwise!
1014                  */
1015                 fd_rwsec_done1(0);
1016         }
1017         else {
1018                 /* not yet finished, wait another tenth rotation */
1019                 local_irq_restore(flags);
1020                 DPRINT(("fd_readtrack_check(): not yet finished\n"));
1021                 mod_timer(&readtrack_timer, jiffies + HZ/5/10);
1022         }
1023 }
1024
1025
1026 static void fd_rwsec_done( int status )
1027 {
1028         DPRINT(("fd_rwsec_done()\n"));
1029
1030         if (read_track) {
1031                 del_timer(&readtrack_timer);
1032                 if (!MultReadInProgress)
1033                         return;
1034                 MultReadInProgress = 0;
1035         }
1036         fd_rwsec_done1(status);
1037 }
1038
1039 static void fd_rwsec_done1(int status)
1040 {
1041         unsigned int track;
1042
1043         stop_timeout();
1044
1045         /* Correct the track if stretch != 0 */
1046         if (SUDT->stretch) {
1047                 track = FDC_READ( FDCREG_TRACK);
1048                 MFPDELAY();
1049                 FDC_WRITE( FDCREG_TRACK, track << SUDT->stretch);
1050         }
1051
1052         if (!UseTrackbuffer) {
1053                 dma_wd.dma_mode_status = 0x90;
1054                 MFPDELAY();
1055                 if (!(dma_wd.dma_mode_status & 0x01)) {
1056                         printk(KERN_ERR "fd%d: DMA error\n", SelectedDrive );
1057                         goto err_end;
1058                 }
1059         }
1060         MFPDELAY();
1061
1062         if (ReqCmd == WRITE && (status & FDCSTAT_WPROT)) {
1063                 printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive );
1064                 goto err_end;
1065         }
1066         if ((status & FDCSTAT_RECNF) &&
1067             /* RECNF is no error after a multiple read when the FDC
1068                searched for a non-existent sector! */
1069             !(read_track && FDC_READ(FDCREG_SECTOR) > SUDT->spt)) {
1070                 if (Probing) {
1071                         if (SUDT > atari_disk_type) {
1072                             if (SUDT[-1].blocks > ReqBlock) {
1073                                 /* try another disk type */
1074                                 SUDT--;
1075                                 set_capacity(unit[SelectedDrive].disk,
1076                                                         SUDT->blocks);
1077                             } else
1078                                 Probing = 0;
1079                         }
1080                         else {
1081                                 if (SUD.flags & FTD_MSG)
1082                                         printk(KERN_INFO "fd%d: Auto-detected floppy type %s\n",
1083                                                SelectedDrive, SUDT->name );
1084                                 Probing=0;
1085                         }
1086                 } else {
1087 /* record not found, but not probing. Maybe stretch wrong ? Restart probing */
1088                         if (SUD.autoprobe) {
1089                                 SUDT = atari_disk_type + StartDiskType[DriveType];
1090                                 set_capacity(unit[SelectedDrive].disk,
1091                                                         SUDT->blocks);
1092                                 Probing = 1;
1093                         }
1094                 }
1095                 if (Probing) {
1096                         if (ATARIHW_PRESENT(FDCSPEED)) {
1097                                 dma_wd.fdc_speed = SUDT->fdc_speed;
1098                                 MFPDELAY();
1099                         }
1100                         setup_req_params( SelectedDrive );
1101                         BufferDrive = -1;
1102                         do_fd_action( SelectedDrive );
1103                         return;
1104                 }
1105
1106                 printk(KERN_ERR "fd%d: sector %d not found (side %d, track %d)\n",
1107                        SelectedDrive, FDC_READ (FDCREG_SECTOR), ReqSide, ReqTrack );
1108                 goto err_end;
1109         }
1110         if (status & FDCSTAT_CRC) {
1111                 printk(KERN_ERR "fd%d: CRC error (side %d, track %d, sector %d)\n",
1112                        SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) );
1113                 goto err_end;
1114         }
1115         if (status & FDCSTAT_LOST) {
1116                 printk(KERN_ERR "fd%d: lost data (side %d, track %d, sector %d)\n",
1117                        SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) );
1118                 goto err_end;
1119         }
1120
1121         Probing = 0;
1122
1123         if (ReqCmd == READ) {
1124                 if (!read_track) {
1125                         void *addr;
1126                         addr = ATARIHW_PRESENT( EXTD_DMA ) ? ReqData : DMABuffer;
1127                         dma_cache_maintenance( virt_to_phys(addr), 512, 0 );
1128                         if (!ATARIHW_PRESENT( EXTD_DMA ))
1129                                 copy_buffer (addr, ReqData);
1130                 } else {
1131                         dma_cache_maintenance( PhysTrackBuffer, MaxSectors[DriveType] * 512, 0 );
1132                         BufferDrive = SelectedDrive;
1133                         BufferSide  = ReqSide;
1134                         BufferTrack = ReqTrack;
1135                         copy_buffer (SECTOR_BUFFER (ReqSector), ReqData);
1136                 }
1137         }
1138
1139         if (++ReqCnt < blk_rq_cur_sectors(fd_request)) {
1140                 /* read next sector */
1141                 setup_req_params( SelectedDrive );
1142                 do_fd_action( SelectedDrive );
1143         }
1144         else {
1145                 /* all sectors finished */
1146                 fd_end_request_cur(0);
1147                 redo_fd_request();
1148         }
1149         return;
1150
1151   err_end:
1152         BufferDrive = -1;
1153         fd_error();
1154 }
1155
1156
1157 static void fd_writetrack( void )
1158 {
1159         unsigned long paddr, flags;
1160         unsigned int track;
1161
1162         DPRINT(("fd_writetrack() Tr=%d Si=%d\n", ReqTrack, ReqSide ));
1163
1164         paddr = PhysTrackBuffer;
1165         dma_cache_maintenance( paddr, BUFFER_SIZE, 1 );
1166
1167         fd_select_side( ReqSide );
1168
1169         /* Cheat for track if stretch != 0 */
1170         if (SUDT->stretch) {
1171                 track = FDC_READ( FDCREG_TRACK);
1172                 MFPDELAY();
1173                 FDC_WRITE(FDCREG_TRACK,track >> SUDT->stretch);
1174         }
1175         udelay(40);
1176
1177         /* Setup DMA */
1178         local_irq_save(flags);
1179         dma_wd.dma_lo = (unsigned char)paddr;
1180         MFPDELAY();
1181         paddr >>= 8;
1182         dma_wd.dma_md = (unsigned char)paddr;
1183         MFPDELAY();
1184         paddr >>= 8;
1185         if (ATARIHW_PRESENT( EXTD_DMA ))
1186                 st_dma_ext_dmahi = (unsigned short)paddr;
1187         else
1188                 dma_wd.dma_hi = (unsigned char)paddr;
1189         MFPDELAY();
1190         local_irq_restore(flags);
1191
1192         /* Clear FIFO and switch DMA to correct mode */
1193         dma_wd.dma_mode_status = 0x190;
1194         MFPDELAY();
1195         dma_wd.dma_mode_status = 0x90;
1196         MFPDELAY();
1197         dma_wd.dma_mode_status = 0x190;
1198         MFPDELAY();
1199
1200         /* How many sectors for DMA */
1201         dma_wd.fdc_acces_seccount = BUFFER_SIZE/512;
1202         udelay(40);
1203
1204         /* Start operation */
1205         dma_wd.dma_mode_status = FDCSELREG_STP | 0x100;
1206         udelay(40);
1207         SET_IRQ_HANDLER( fd_writetrack_done );
1208         dma_wd.fdc_acces_seccount = FDCCMD_WRTRA | get_head_settle_flag();
1209
1210         MotorOn = 1;
1211         start_timeout();
1212         /* wait for interrupt */
1213 }
1214
1215
1216 static void fd_writetrack_done( int status )
1217 {
1218         DPRINT(("fd_writetrack_done()\n"));
1219
1220         stop_timeout();
1221
1222         if (status & FDCSTAT_WPROT) {
1223                 printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive );
1224                 goto err_end;
1225         }
1226         if (status & FDCSTAT_LOST) {
1227                 printk(KERN_ERR "fd%d: lost data (side %d, track %d)\n",
1228                                 SelectedDrive, ReqSide, ReqTrack );
1229                 goto err_end;
1230         }
1231
1232         wake_up( &format_wait );
1233         return;
1234
1235   err_end:
1236         fd_error();
1237 }
1238
1239 static void fd_times_out( unsigned long dummy )
1240 {
1241         atari_disable_irq( IRQ_MFP_FDC );
1242         if (!FloppyIRQHandler) goto end; /* int occurred after timer was fired, but
1243                                           * before we came here... */
1244
1245         SET_IRQ_HANDLER( NULL );
1246         /* If the timeout occurred while the readtrack_check timer was
1247          * active, we need to cancel it, else bad things will happen */
1248         if (UseTrackbuffer)
1249                 del_timer( &readtrack_timer );
1250         FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1251         udelay( 25 );
1252
1253         printk(KERN_ERR "floppy timeout\n" );
1254         fd_error();
1255   end:
1256         atari_enable_irq( IRQ_MFP_FDC );
1257 }
1258
1259
1260 /* The (noop) seek operation here is needed to make the WP bit in the
1261  * FDC status register accessible for check_change. If the last disk
1262  * operation would have been a RDSEC, this bit would always read as 0
1263  * no matter what :-( To save time, the seek goes to the track we're
1264  * already on.
1265  */
1266
1267 static void finish_fdc( void )
1268 {
1269         if (!NeedSeek) {
1270                 finish_fdc_done( 0 );
1271         }
1272         else {
1273                 DPRINT(("finish_fdc: dummy seek started\n"));
1274                 FDC_WRITE (FDCREG_DATA, SUD.track);
1275                 SET_IRQ_HANDLER( finish_fdc_done );
1276                 FDC_WRITE (FDCREG_CMD, FDCCMD_SEEK);
1277                 MotorOn = 1;
1278                 start_timeout();
1279                 /* we must wait for the IRQ here, because the ST-DMA
1280                    is released immediately afterwards and the interrupt
1281                    may be delivered to the wrong driver. */
1282           }
1283 }
1284
1285
1286 static void finish_fdc_done( int dummy )
1287 {
1288         unsigned long flags;
1289
1290         DPRINT(("finish_fdc_done entered\n"));
1291         stop_timeout();
1292         NeedSeek = 0;
1293
1294         if (timer_pending(&fd_timer) && time_before(fd_timer.expires, jiffies + 5))
1295                 /* If the check for a disk change is done too early after this
1296                  * last seek command, the WP bit still reads wrong :-((
1297                  */
1298                 mod_timer(&fd_timer, jiffies + 5);
1299         else
1300                 start_check_change_timer();
1301         start_motor_off_timer();
1302
1303         local_irq_save(flags);
1304         stdma_release();
1305         fdc_busy = 0;
1306         wake_up( &fdc_wait );
1307         local_irq_restore(flags);
1308
1309         DPRINT(("finish_fdc() finished\n"));
1310 }
1311
1312 /* The detection of disk changes is a dark chapter in Atari history :-(
1313  * Because the "Drive ready" signal isn't present in the Atari
1314  * hardware, one has to rely on the "Write Protect". This works fine,
1315  * as long as no write protected disks are used. TOS solves this
1316  * problem by introducing tri-state logic ("maybe changed") and
1317  * looking at the serial number in block 0. This isn't possible for
1318  * Linux, since the floppy driver can't make assumptions about the
1319  * filesystem used on the disk and thus the contents of block 0. I've
1320  * chosen the method to always say "The disk was changed" if it is
1321  * unsure whether it was. This implies that every open or mount
1322  * invalidates the disk buffers if you work with write protected
1323  * disks. But at least this is better than working with incorrect data
1324  * due to unrecognised disk changes.
1325  */
1326
1327 static unsigned int floppy_check_events(struct gendisk *disk,
1328                                         unsigned int clearing)
1329 {
1330         struct atari_floppy_struct *p = disk->private_data;
1331         unsigned int drive = p - unit;
1332         if (test_bit (drive, &fake_change)) {
1333                 /* simulated change (e.g. after formatting) */
1334                 return DISK_EVENT_MEDIA_CHANGE;
1335         }
1336         if (test_bit (drive, &changed_floppies)) {
1337                 /* surely changed (the WP signal changed at least once) */
1338                 return DISK_EVENT_MEDIA_CHANGE;
1339         }
1340         if (UD.wpstat) {
1341                 /* WP is on -> could be changed: to be sure, buffers should be
1342                  * invalidated...
1343                  */
1344                 return DISK_EVENT_MEDIA_CHANGE;
1345         }
1346
1347         return 0;
1348 }
1349
1350 static int floppy_revalidate(struct gendisk *disk)
1351 {
1352         struct atari_floppy_struct *p = disk->private_data;
1353         unsigned int drive = p - unit;
1354
1355         if (test_bit(drive, &changed_floppies) ||
1356             test_bit(drive, &fake_change) ||
1357             p->disktype == 0) {
1358                 if (UD.flags & FTD_MSG)
1359                         printk(KERN_ERR "floppy: clear format %p!\n", UDT);
1360                 BufferDrive = -1;
1361                 clear_bit(drive, &fake_change);
1362                 clear_bit(drive, &changed_floppies);
1363                 /* MSch: clearing geometry makes sense only for autoprobe
1364                    formats, for 'permanent user-defined' parameter:
1365                    restore default_params[] here if flagged valid! */
1366                 if (default_params[drive].blocks == 0)
1367                         UDT = NULL;
1368                 else
1369                         UDT = &default_params[drive];
1370         }
1371         return 0;
1372 }
1373
1374
1375 /* This sets up the global variables describing the current request. */
1376
1377 static void setup_req_params( int drive )
1378 {
1379         int block = ReqBlock + ReqCnt;
1380
1381         ReqTrack = block / UDT->spt;
1382         ReqSector = block - ReqTrack * UDT->spt + 1;
1383         ReqSide = ReqTrack & 1;
1384         ReqTrack >>= 1;
1385         ReqData = ReqBuffer + 512 * ReqCnt;
1386
1387         if (UseTrackbuffer)
1388                 read_track = (ReqCmd == READ && fd_request->errors == 0);
1389         else
1390                 read_track = 0;
1391
1392         DPRINT(("Request params: Si=%d Tr=%d Se=%d Data=%08lx\n",ReqSide,
1393                         ReqTrack, ReqSector, (unsigned long)ReqData ));
1394 }
1395
1396 /*
1397  * Round-robin between our available drives, doing one request from each
1398  */
1399 static struct request *set_next_request(void)
1400 {
1401         struct request_queue *q;
1402         int old_pos = fdc_queue;
1403         struct request *rq = NULL;
1404
1405         do {
1406                 q = unit[fdc_queue].disk->queue;
1407                 if (++fdc_queue == FD_MAX_UNITS)
1408                         fdc_queue = 0;
1409                 if (q) {
1410                         rq = blk_fetch_request(q);
1411                         if (rq)
1412                                 break;
1413                 }
1414         } while (fdc_queue != old_pos);
1415
1416         return rq;
1417 }
1418
1419
1420 static void redo_fd_request(void)
1421 {
1422         int drive, type;
1423         struct atari_floppy_struct *floppy;
1424
1425         DPRINT(("redo_fd_request: fd_request=%p dev=%s fd_request->sector=%ld\n",
1426                 fd_request, fd_request ? fd_request->rq_disk->disk_name : "",
1427                 fd_request ? blk_rq_pos(fd_request) : 0 ));
1428
1429         IsFormatting = 0;
1430
1431 repeat:
1432         if (!fd_request) {
1433                 fd_request = set_next_request();
1434                 if (!fd_request)
1435                         goto the_end;
1436         }
1437
1438         floppy = fd_request->rq_disk->private_data;
1439         drive = floppy - unit;
1440         type = floppy->type;
1441
1442         if (!UD.connected) {
1443                 /* drive not connected */
1444                 printk(KERN_ERR "Unknown Device: fd%d\n", drive );
1445                 fd_end_request_cur(-EIO);
1446                 goto repeat;
1447         }
1448
1449         if (type == 0) {
1450                 if (!UDT) {
1451                         Probing = 1;
1452                         UDT = atari_disk_type + StartDiskType[DriveType];
1453                         set_capacity(floppy->disk, UDT->blocks);
1454                         UD.autoprobe = 1;
1455                 }
1456         }
1457         else {
1458                 /* user supplied disk type */
1459                 if (--type >= NUM_DISK_MINORS) {
1460                         printk(KERN_WARNING "fd%d: invalid disk format", drive );
1461                         fd_end_request_cur(-EIO);
1462                         goto repeat;
1463                 }
1464                 if (minor2disktype[type].drive_types > DriveType)  {
1465                         printk(KERN_WARNING "fd%d: unsupported disk format", drive );
1466                         fd_end_request_cur(-EIO);
1467                         goto repeat;
1468                 }
1469                 type = minor2disktype[type].index;
1470                 UDT = &atari_disk_type[type];
1471                 set_capacity(floppy->disk, UDT->blocks);
1472                 UD.autoprobe = 0;
1473         }
1474
1475         if (blk_rq_pos(fd_request) + 1 > UDT->blocks) {
1476                 fd_end_request_cur(-EIO);
1477                 goto repeat;
1478         }
1479
1480         /* stop deselect timer */
1481         del_timer( &motor_off_timer );
1482
1483         ReqCnt = 0;
1484         ReqCmd = rq_data_dir(fd_request);
1485         ReqBlock = blk_rq_pos(fd_request);
1486         ReqBuffer = fd_request->buffer;
1487         setup_req_params( drive );
1488         do_fd_action( drive );
1489
1490         return;
1491
1492   the_end:
1493         finish_fdc();
1494 }
1495
1496
1497 void do_fd_request(struct request_queue * q)
1498 {
1499         DPRINT(("do_fd_request for pid %d\n",current->pid));
1500         while( fdc_busy ) sleep_on( &fdc_wait );
1501         fdc_busy = 1;
1502         stdma_lock(floppy_irq, NULL);
1503
1504         atari_disable_irq( IRQ_MFP_FDC );
1505         redo_fd_request();
1506         atari_enable_irq( IRQ_MFP_FDC );
1507 }
1508
1509 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode,
1510                     unsigned int cmd, unsigned long param)
1511 {
1512         struct gendisk *disk = bdev->bd_disk;
1513         struct atari_floppy_struct *floppy = disk->private_data;
1514         int drive = floppy - unit;
1515         int type = floppy->type;
1516         struct atari_format_descr fmt_desc;
1517         struct atari_disk_type *dtp;
1518         struct floppy_struct getprm;
1519         int settype;
1520         struct floppy_struct setprm;
1521         void __user *argp = (void __user *)param;
1522
1523         switch (cmd) {
1524         case FDGETPRM:
1525                 if (type) {
1526                         if (--type >= NUM_DISK_MINORS)
1527                                 return -ENODEV;
1528                         if (minor2disktype[type].drive_types > DriveType)
1529                                 return -ENODEV;
1530                         type = minor2disktype[type].index;
1531                         dtp = &atari_disk_type[type];
1532                         if (UD.flags & FTD_MSG)
1533                             printk (KERN_ERR "floppy%d: found dtp %p name %s!\n",
1534                                 drive, dtp, dtp->name);
1535                 }
1536                 else {
1537                         if (!UDT)
1538                                 return -ENXIO;
1539                         else
1540                                 dtp = UDT;
1541                 }
1542                 memset((void *)&getprm, 0, sizeof(getprm));
1543                 getprm.size = dtp->blocks;
1544                 getprm.sect = dtp->spt;
1545                 getprm.head = 2;
1546                 getprm.track = dtp->blocks/dtp->spt/2;
1547                 getprm.stretch = dtp->stretch;
1548                 if (copy_to_user(argp, &getprm, sizeof(getprm)))
1549                         return -EFAULT;
1550                 return 0;
1551         }
1552         switch (cmd) {
1553         case FDSETPRM:
1554         case FDDEFPRM:
1555                 /*
1556                  * MSch 7/96: simple 'set geometry' case: just set the
1557                  * 'default' device params (minor == 0).
1558                  * Currently, the drive geometry is cleared after each
1559                  * disk change and subsequent revalidate()! simple
1560                  * implementation of FDDEFPRM: save geometry from a
1561                  * FDDEFPRM call and restore it in floppy_revalidate() !
1562                  */
1563
1564                 /* get the parameters from user space */
1565                 if (floppy->ref != 1 && floppy->ref != -1)
1566                         return -EBUSY;
1567                 if (copy_from_user(&setprm, argp, sizeof(setprm)))
1568                         return -EFAULT;
1569                 /*
1570                  * first of all: check for floppy change and revalidate,
1571                  * or the next access will revalidate - and clear UDT :-(
1572                  */
1573
1574                 if (floppy_check_events(disk, 0))
1575                         floppy_revalidate(disk);
1576
1577                 if (UD.flags & FTD_MSG)
1578                     printk (KERN_INFO "floppy%d: setting size %d spt %d str %d!\n",
1579                         drive, setprm.size, setprm.sect, setprm.stretch);
1580
1581                 /* what if type > 0 here? Overwrite specified entry ? */
1582                 if (type) {
1583                         /* refuse to re-set a predefined type for now */
1584                         redo_fd_request();
1585                         return -EINVAL;
1586                 }
1587
1588                 /*
1589                  * type == 0: first look for a matching entry in the type list,
1590                  * and set the UD.disktype field to use the perdefined entry.
1591                  * TODO: add user-defined format to head of autoprobe list ?
1592                  * Useful to include the user-type for future autodetection!
1593                  */
1594
1595                 for (settype = 0; settype < NUM_DISK_MINORS; settype++) {
1596                         int setidx = 0;
1597                         if (minor2disktype[settype].drive_types > DriveType) {
1598                                 /* skip this one, invalid for drive ... */
1599                                 continue;
1600                         }
1601                         setidx = minor2disktype[settype].index;
1602                         dtp = &atari_disk_type[setidx];
1603
1604                         /* found matching entry ?? */
1605                         if (   dtp->blocks  == setprm.size
1606                             && dtp->spt     == setprm.sect
1607                             && dtp->stretch == setprm.stretch ) {
1608                                 if (UD.flags & FTD_MSG)
1609                                     printk (KERN_INFO "floppy%d: setting %s %p!\n",
1610                                         drive, dtp->name, dtp);
1611                                 UDT = dtp;
1612                                 set_capacity(floppy->disk, UDT->blocks);
1613
1614                                 if (cmd == FDDEFPRM) {
1615                                   /* save settings as permanent default type */
1616                                   default_params[drive].name    = dtp->name;
1617                                   default_params[drive].spt     = dtp->spt;
1618                                   default_params[drive].blocks  = dtp->blocks;
1619                                   default_params[drive].fdc_speed = dtp->fdc_speed;
1620                                   default_params[drive].stretch = dtp->stretch;
1621                                 }
1622
1623                                 return 0;
1624                         }
1625
1626                 }
1627
1628                 /* no matching disk type found above - setting user_params */
1629
1630                 if (cmd == FDDEFPRM) {
1631                         /* set permanent type */
1632                         dtp = &default_params[drive];
1633                 } else
1634                         /* set user type (reset by disk change!) */
1635                         dtp = &user_params[drive];
1636
1637                 dtp->name   = "user format";
1638                 dtp->blocks = setprm.size;
1639                 dtp->spt    = setprm.sect;
1640                 if (setprm.sect > 14)
1641                         dtp->fdc_speed = 3;
1642                 else
1643                         dtp->fdc_speed = 0;
1644                 dtp->stretch = setprm.stretch;
1645
1646                 if (UD.flags & FTD_MSG)
1647                         printk (KERN_INFO "floppy%d: blk %d spt %d str %d!\n",
1648                                 drive, dtp->blocks, dtp->spt, dtp->stretch);
1649
1650                 /* sanity check */
1651                 if (setprm.track != dtp->blocks/dtp->spt/2 ||
1652                     setprm.head != 2) {
1653                         redo_fd_request();
1654                         return -EINVAL;
1655                 }
1656
1657                 UDT = dtp;
1658                 set_capacity(floppy->disk, UDT->blocks);
1659
1660                 return 0;
1661         case FDMSGON:
1662                 UD.flags |= FTD_MSG;
1663                 return 0;
1664         case FDMSGOFF:
1665                 UD.flags &= ~FTD_MSG;
1666                 return 0;
1667         case FDSETEMSGTRESH:
1668                 return -EINVAL;
1669         case FDFMTBEG:
1670                 return 0;
1671         case FDFMTTRK:
1672                 if (floppy->ref != 1 && floppy->ref != -1)
1673                         return -EBUSY;
1674                 if (copy_from_user(&fmt_desc, argp, sizeof(fmt_desc)))
1675                         return -EFAULT;
1676                 return do_format(drive, type, &fmt_desc);
1677         case FDCLRPRM:
1678                 UDT = NULL;
1679                 /* MSch: invalidate default_params */
1680                 default_params[drive].blocks  = 0;
1681                 set_capacity(floppy->disk, MAX_DISK_SIZE * 2);
1682         case FDFMTEND:
1683         case FDFLUSH:
1684                 /* invalidate the buffer track to force a reread */
1685                 BufferDrive = -1;
1686                 set_bit(drive, &fake_change);
1687                 check_disk_change(bdev);
1688                 return 0;
1689         default:
1690                 return -EINVAL;
1691         }
1692 }
1693
1694 static int fd_ioctl(struct block_device *bdev, fmode_t mode,
1695                              unsigned int cmd, unsigned long arg)
1696 {
1697         int ret;
1698
1699         mutex_lock(&ataflop_mutex);
1700         ret = fd_locked_ioctl(bdev, mode, cmd, arg);
1701         mutex_unlock(&ataflop_mutex);
1702
1703         return ret;
1704 }
1705
1706 /* Initialize the 'unit' variable for drive 'drive' */
1707
1708 static void __init fd_probe( int drive )
1709 {
1710         UD.connected = 0;
1711         UDT  = NULL;
1712
1713         if (!fd_test_drive_present( drive ))
1714                 return;
1715
1716         UD.connected = 1;
1717         UD.track     = 0;
1718         switch( UserSteprate[drive] ) {
1719         case 2:
1720                 UD.steprate = FDCSTEP_2;
1721                 break;
1722         case 3:
1723                 UD.steprate = FDCSTEP_3;
1724                 break;
1725         case 6:
1726                 UD.steprate = FDCSTEP_6;
1727                 break;
1728         case 12:
1729                 UD.steprate = FDCSTEP_12;
1730                 break;
1731         default: /* should be -1 for "not set by user" */
1732                 if (ATARIHW_PRESENT( FDCSPEED ) || MACH_IS_MEDUSA)
1733                         UD.steprate = FDCSTEP_3;
1734                 else
1735                         UD.steprate = FDCSTEP_6;
1736                 break;
1737         }
1738         MotorOn = 1;    /* from probe restore operation! */
1739 }
1740
1741
1742 /* This function tests the physical presence of a floppy drive (not
1743  * whether a disk is inserted). This is done by issuing a restore
1744  * command, waiting max. 2 seconds (that should be enough to move the
1745  * head across the whole disk) and looking at the state of the "TR00"
1746  * signal. This should now be raised if there is a drive connected
1747  * (and there is no hardware failure :-) Otherwise, the drive is
1748  * declared absent.
1749  */
1750
1751 static int __init fd_test_drive_present( int drive )
1752 {
1753         unsigned long timeout;
1754         unsigned char status;
1755         int ok;
1756
1757         if (drive >= (MACH_IS_FALCON ? 1 : 2)) return( 0 );
1758         fd_select_drive( drive );
1759
1760         /* disable interrupt temporarily */
1761         atari_turnoff_irq( IRQ_MFP_FDC );
1762         FDC_WRITE (FDCREG_TRACK, 0xff00);
1763         FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | FDCCMDADD_H | FDCSTEP_6 );
1764
1765         timeout = jiffies + 2*HZ+HZ/2;
1766         while (time_before(jiffies, timeout))
1767                 if (!(st_mfp.par_dt_reg & 0x20))
1768                         break;
1769
1770         status = FDC_READ( FDCREG_STATUS );
1771         ok = (status & FDCSTAT_TR00) != 0;
1772
1773         /* force interrupt to abort restore operation (FDC would try
1774          * about 50 seconds!) */
1775         FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1776         udelay(500);
1777         status = FDC_READ( FDCREG_STATUS );
1778         udelay(20);
1779
1780         if (ok) {
1781                 /* dummy seek command to make WP bit accessible */
1782                 FDC_WRITE( FDCREG_DATA, 0 );
1783                 FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK );
1784                 while( st_mfp.par_dt_reg & 0x20 )
1785                         ;
1786                 status = FDC_READ( FDCREG_STATUS );
1787         }
1788
1789         atari_turnon_irq( IRQ_MFP_FDC );
1790         return( ok );
1791 }
1792
1793
1794 /* Look how many and which kind of drives are connected. If there are
1795  * floppies, additionally start the disk-change and motor-off timers.
1796  */
1797
1798 static void __init config_types( void )
1799 {
1800         int drive, cnt = 0;
1801
1802         /* for probing drives, set the FDC speed to 8 MHz */
1803         if (ATARIHW_PRESENT(FDCSPEED))
1804                 dma_wd.fdc_speed = 0;
1805
1806         printk(KERN_INFO "Probing floppy drive(s):\n");
1807         for( drive = 0; drive < FD_MAX_UNITS; drive++ ) {
1808                 fd_probe( drive );
1809                 if (UD.connected) {
1810                         printk(KERN_INFO "fd%d\n", drive);
1811                         ++cnt;
1812                 }
1813         }
1814
1815         if (FDC_READ( FDCREG_STATUS ) & FDCSTAT_BUSY) {
1816                 /* If FDC is still busy from probing, give it another FORCI
1817                  * command to abort the operation. If this isn't done, the FDC
1818                  * will interrupt later and its IRQ line stays low, because
1819                  * the status register isn't read. And this will block any
1820                  * interrupts on this IRQ line :-(
1821                  */
1822                 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1823                 udelay(500);
1824                 FDC_READ( FDCREG_STATUS );
1825                 udelay(20);
1826         }
1827
1828         if (cnt > 0) {
1829                 start_motor_off_timer();
1830                 if (cnt == 1) fd_select_drive( 0 );
1831                 start_check_change_timer();
1832         }
1833 }
1834
1835 /*
1836  * floppy_open check for aliasing (/dev/fd0 can be the same as
1837  * /dev/PS0 etc), and disallows simultaneous access to the same
1838  * drive with different device numbers.
1839  */
1840
1841 static int floppy_open(struct block_device *bdev, fmode_t mode)
1842 {
1843         struct atari_floppy_struct *p = bdev->bd_disk->private_data;
1844         int type  = MINOR(bdev->bd_dev) >> 2;
1845
1846         DPRINT(("fd_open: type=%d\n",type));
1847         if (p->ref && p->type != type)
1848                 return -EBUSY;
1849
1850         if (p->ref == -1 || (p->ref && mode & FMODE_EXCL))
1851                 return -EBUSY;
1852
1853         if (mode & FMODE_EXCL)
1854                 p->ref = -1;
1855         else
1856                 p->ref++;
1857
1858         p->type = type;
1859
1860         if (mode & FMODE_NDELAY)
1861                 return 0;
1862
1863         if (mode & (FMODE_READ|FMODE_WRITE)) {
1864                 check_disk_change(bdev);
1865                 if (mode & FMODE_WRITE) {
1866                         if (p->wpstat) {
1867                                 if (p->ref < 0)
1868                                         p->ref = 0;
1869                                 else
1870                                         p->ref--;
1871                                 return -EROFS;
1872                         }
1873                 }
1874         }
1875         return 0;
1876 }
1877
1878 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
1879 {
1880         int ret;
1881
1882         mutex_lock(&ataflop_mutex);
1883         ret = floppy_open(bdev, mode);
1884         mutex_unlock(&ataflop_mutex);
1885
1886         return ret;
1887 }
1888
1889 static int floppy_release(struct gendisk *disk, fmode_t mode)
1890 {
1891         struct atari_floppy_struct *p = disk->private_data;
1892         mutex_lock(&ataflop_mutex);
1893         if (p->ref < 0)
1894                 p->ref = 0;
1895         else if (!p->ref--) {
1896                 printk(KERN_ERR "floppy_release with fd_ref == 0");
1897                 p->ref = 0;
1898         }
1899         mutex_unlock(&ataflop_mutex);
1900         return 0;
1901 }
1902
1903 static const struct block_device_operations floppy_fops = {
1904         .owner          = THIS_MODULE,
1905         .open           = floppy_unlocked_open,
1906         .release        = floppy_release,
1907         .ioctl          = fd_ioctl,
1908         .check_events   = floppy_check_events,
1909         .revalidate_disk= floppy_revalidate,
1910 };
1911
1912 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
1913 {
1914         int drive = *part & 3;
1915         int type  = *part >> 2;
1916         if (drive >= FD_MAX_UNITS || type > NUM_DISK_MINORS)
1917                 return NULL;
1918         *part = 0;
1919         return get_disk(unit[drive].disk);
1920 }
1921
1922 static int __init atari_floppy_init (void)
1923 {
1924         int i;
1925
1926         if (!MACH_IS_ATARI)
1927                 /* Amiga, Mac, ... don't have Atari-compatible floppy :-) */
1928                 return -ENODEV;
1929
1930         if (register_blkdev(FLOPPY_MAJOR,"fd"))
1931                 return -EBUSY;
1932
1933         for (i = 0; i < FD_MAX_UNITS; i++) {
1934                 unit[i].disk = alloc_disk(1);
1935                 if (!unit[i].disk)
1936                         goto Enomem;
1937         }
1938
1939         if (UseTrackbuffer < 0)
1940                 /* not set by user -> use default: for now, we turn
1941                    track buffering off for all Medusas, though it
1942                    could be used with ones that have a counter
1943                    card. But the test is too hard :-( */
1944                 UseTrackbuffer = !MACH_IS_MEDUSA;
1945
1946         /* initialize variables */
1947         SelectedDrive = -1;
1948         BufferDrive = -1;
1949
1950         DMABuffer = atari_stram_alloc(BUFFER_SIZE+512, "ataflop");
1951         if (!DMABuffer) {
1952                 printk(KERN_ERR "atari_floppy_init: cannot get dma buffer\n");
1953                 goto Enomem;
1954         }
1955         TrackBuffer = DMABuffer + 512;
1956         PhysDMABuffer = virt_to_phys(DMABuffer);
1957         PhysTrackBuffer = virt_to_phys(TrackBuffer);
1958         BufferDrive = BufferSide = BufferTrack = -1;
1959
1960         for (i = 0; i < FD_MAX_UNITS; i++) {
1961                 unit[i].track = -1;
1962                 unit[i].flags = 0;
1963                 unit[i].disk->major = FLOPPY_MAJOR;
1964                 unit[i].disk->first_minor = i;
1965                 sprintf(unit[i].disk->disk_name, "fd%d", i);
1966                 unit[i].disk->fops = &floppy_fops;
1967                 unit[i].disk->private_data = &unit[i];
1968                 unit[i].disk->queue = blk_init_queue(do_fd_request,
1969                                         &ataflop_lock);
1970                 if (!unit[i].disk->queue)
1971                         goto Enomem;
1972                 set_capacity(unit[i].disk, MAX_DISK_SIZE * 2);
1973                 add_disk(unit[i].disk);
1974         }
1975
1976         blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
1977                                 floppy_find, NULL, NULL);
1978
1979         printk(KERN_INFO "Atari floppy driver: max. %cD, %strack buffering\n",
1980                DriveType == 0 ? 'D' : DriveType == 1 ? 'H' : 'E',
1981                UseTrackbuffer ? "" : "no ");
1982         config_types();
1983
1984         return 0;
1985 Enomem:
1986         while (i--) {
1987                 struct request_queue *q = unit[i].disk->queue;
1988
1989                 put_disk(unit[i].disk);
1990                 if (q)
1991                         blk_cleanup_queue(q);
1992         }
1993
1994         unregister_blkdev(FLOPPY_MAJOR, "fd");
1995         return -ENOMEM;
1996 }
1997
1998 #ifndef MODULE
1999 static int __init atari_floppy_setup(char *str)
2000 {
2001         int ints[3 + FD_MAX_UNITS];
2002         int i;
2003
2004         if (!MACH_IS_ATARI)
2005                 return 0;
2006
2007         str = get_options(str, 3 + FD_MAX_UNITS, ints);
2008
2009         if (ints[0] < 1) {
2010                 printk(KERN_ERR "ataflop_setup: no arguments!\n" );
2011                 return 0;
2012         }
2013         else if (ints[0] > 2+FD_MAX_UNITS) {
2014                 printk(KERN_ERR "ataflop_setup: too many arguments\n" );
2015         }
2016
2017         if (ints[1] < 0 || ints[1] > 2)
2018                 printk(KERN_ERR "ataflop_setup: bad drive type\n" );
2019         else
2020                 DriveType = ints[1];
2021
2022         if (ints[0] >= 2)
2023                 UseTrackbuffer = (ints[2] > 0);
2024
2025         for( i = 3; i <= ints[0] && i-3 < FD_MAX_UNITS; ++i ) {
2026                 if (ints[i] != 2 && ints[i] != 3 && ints[i] != 6 && ints[i] != 12)
2027                         printk(KERN_ERR "ataflop_setup: bad steprate\n" );
2028                 else
2029                         UserSteprate[i-3] = ints[i];
2030         }
2031         return 1;
2032 }
2033
2034 __setup("floppy=", atari_floppy_setup);
2035 #endif
2036
2037 static void __exit atari_floppy_exit(void)
2038 {
2039         int i;
2040         blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
2041         for (i = 0; i < FD_MAX_UNITS; i++) {
2042                 struct request_queue *q = unit[i].disk->queue;
2043
2044                 del_gendisk(unit[i].disk);
2045                 put_disk(unit[i].disk);
2046                 blk_cleanup_queue(q);
2047         }
2048         unregister_blkdev(FLOPPY_MAJOR, "fd");
2049
2050         del_timer_sync(&fd_timer);
2051         atari_stram_free( DMABuffer );
2052 }
2053
2054 module_init(atari_floppy_init)
2055 module_exit(atari_floppy_exit)
2056
2057 MODULE_LICENSE("GPL");