drivers/block/amiflop.c

   1 /*
   2  *  linux/amiga/amiflop.c
   3  *
   4  *  Copyright (C) 1993  Greg Harp
   5  *  Portions of this driver are based on code contributed by Brad Pepers
   6  *
   7  *  revised 28.5.95 by Joerg Dorchain
   8  *  - now no bugs(?) any more for both HD & DD
   9  *  - added support for 40 Track 5.25" drives, 80-track hopefully behaves
  10  *    like 3.5" dd (no way to test - are there any 5.25" drives out there
  11  *    that work on an A4000?)
  12  *  - wrote formatting routine (maybe dirty, but works)
  13  *
  14  *  june/july 1995 added ms-dos support by Joerg Dorchain
  15  *  (portions based on messydos.device and various contributors)
  16  *  - currently only 9 and 18 sector disks
  17  *
  18  *  - fixed a bug with the internal trackbuffer when using multiple
  19  *    disks the same time
  20  *  - made formatting a bit safer
  21  *  - added command line and machine based default for "silent" df0
  22  *
  23  *  december 1995 adapted for 1.2.13pl4 by Joerg Dorchain
  24  *  - works but I think it's inefficient. (look in redo_fd_request)
  25  *    But the changes were very efficient. (only three and a half lines)
  26  *
  27  *  january 1996 added special ioctl for tracking down read/write problems
  28  *  - usage ioctl(d, RAW_TRACK, ptr); the raw track buffer (MFM-encoded data
  29  *    is copied to area. (area should be large enough since no checking is
  30  *    done - 30K is currently sufficient). return the actual size of the
  31  *    trackbuffer
  32  *  - replaced udelays() by a timer (CIAA timer B) for the waits
  33  *    needed for the disk mechanic.
  34  *
  35  *  february 1996 fixed error recovery and multiple disk access
  36  *  - both got broken the first time I tampered with the driver :-(
  37  *  - still not safe, but better than before
  38  *
  39  *  revised Marts 3rd, 1996 by Jes Sorensen for use in the 1.3.28 kernel.
  40  *  - Minor changes to accept the kdev_t.
  41  *  - Replaced some more udelays with ms_delays. Udelay is just a loop,
  42  *    and so the delay will be different depending on the given
  43  *    processor :-(
  44  *  - The driver could use a major cleanup because of the new
  45  *    major/minor handling that came with kdev_t. It seems to work for
  46  *    the time being, but I can't guarantee that it will stay like
  47  *    that when we start using 16 (24?) bit minors.
  48  *
  49  * restructured jan 1997 by Joerg Dorchain
  50  * - Fixed Bug accessing multiple disks
  51  * - some code cleanup
  52  * - added trackbuffer for each drive to speed things up
  53  * - fixed some race conditions (who finds the next may send it to me ;-)
  54  */
  55
  56 #include <linux/module.h>
  57
  58 #include <linux/sched.h>
  59 #include <linux/fs.h>
  60 #include <linux/fcntl.h>
  61 #include <linux/kernel.h>
  62 #include <linux/timer.h>
  63 #include <linux/fd.h>
  64 #include <linux/hdreg.h>
  65 #include <linux/errno.h>
  66 #include <linux/types.h>
  67 #include <linux/delay.h>
  68 #include <linux/string.h>
  69 #include <linux/slab.h>
  70 #include <linux/init.h>
  71 #include <linux/amifdreg.h>
  72 #include <linux/amifd.h>
  73 #include <linux/ioport.h>
  74
  75 #include <asm/setup.h>
  76 #include <asm/uaccess.h>
  77 #include <asm/amigahw.h>
  78 #include <asm/amigaints.h>
  79 #include <asm/irq.h>
  80
  81 #define MAJOR_NR FLOPPY_MAJOR
  82 #include <linux/blk.h>
  83
  84 #undef DEBUG /* print _LOTS_ of infos */
  85
  86 #define RAW_IOCTL
  87 #ifdef RAW_IOCTL
  88 #define IOCTL_RAW_TRACK 0x5254524B  /* 'RTRK' */
  89 #endif
  90
  91 /*
  92  *  Defines
  93  */
  94
  95 /*
  96  *  Error codes
  97  */
  98 #define FD_OK           0       /* operation succeeded */
  99 #define FD_ERROR        -1      /* general error (seek, read, write, etc) */
 100 #define FD_NOUNIT       1       /* unit does not exist */
 101 #define FD_UNITBUSY     2       /* unit already active */
 102 #define FD_NOTACTIVE    3       /* unit is not active */
 103 #define FD_NOTREADY     4       /* unit is not ready (motor not on/no disk) */
 104
 105 #define MFM_NOSYNC      1
 106 #define MFM_HEADER      2
 107 #define MFM_DATA        3
 108 #define MFM_TRACK       4
 109
 110 /*
 111  *  Floppy ID values
 112  */
 113 #define FD_NODRIVE      0x00000000  /* response when no unit is present */
 114 #define FD_DD_3         0xffffffff  /* double-density 3.5" (880K) drive */
 115 #define FD_HD_3         0x55555555  /* high-density 3.5" (1760K) drive */
 116 #define FD_DD_5         0xaaaaaaaa  /* double-density 5.25" (440K) drive */
 117
 118 static long int fd_def_df0 = FD_DD_3;     /* default for df0 if it doesn't identify */
 119
 120 MODULE_PARM(fd_def_df0,"l");
 121 MODULE_LICENSE("GPL");
 122
 123 /*
 124  *  Macros
 125  */
 126 #define MOTOR_ON        (ciab.prb &= ~DSKMOTOR)
 127 #define MOTOR_OFF       (ciab.prb |= DSKMOTOR)
 128 #define SELECT(mask)    (ciab.prb &= ~mask)
 129 #define DESELECT(mask)  (ciab.prb |= mask)
 130 #define SELMASK(drive)  (1 << (3 + (drive & 3)))
 131
 132 static struct fd_drive_type drive_types[] = {
 133 /*  code        name       tr he   rdsz   wrsz sm pc1 pc2 sd  st st*/
 134 /*  warning: times are now in milliseconds (ms)                    */
 135 { FD_DD_3,      "DD 3.5",  80, 2, 14716, 13630, 1, 80,161, 3, 18, 1},
 136 { FD_HD_3,      "HD 3.5",  80, 2, 28344, 27258, 2, 80,161, 3, 18, 1},
 137 { FD_DD_5,      "DD 5.25", 40, 2, 14716, 13630, 1, 40, 81, 6, 30, 2},
 138 { FD_NODRIVE, "No Drive", 0, 0,     0,     0, 0,  0,  0,  0,  0, 0}
 139 };
 140 static int num_dr_types = sizeof(drive_types) / sizeof(drive_types[0]);
 141
 142 /* defaults for 3 1/2" HD-Disks */
 143 static int floppy_sizes[256]={880,880,880,880,720,720,720,720,};
 144 static int floppy_blocksizes[256];
 145 /* hardsector size assumed to be 512 */
 146
 147 static int amiga_read(int), dos_read(int);
 148 static void amiga_write(int), dos_write(int);
 149 static struct fd_data_type data_types[] = {
 150         { "Amiga", 11 , amiga_read, amiga_write},
 151         { "MS-Dos", 9, dos_read, dos_write}
 152 };
 153
 154 /* current info on each unit */
 155 static struct amiga_floppy_struct unit[FD_MAX_UNITS];
 156
 157 static struct timer_list flush_track_timer[FD_MAX_UNITS];
 158 static struct timer_list post_write_timer;
 159 static struct timer_list motor_on_timer;
 160 static struct timer_list motor_off_timer[FD_MAX_UNITS];
 161 static int on_attempts;
 162
 163 /* Synchronization of FDC access */
 164 /* request loop (trackbuffer) */
 165 static volatile int fdc_busy = -1;
 166 static volatile int fdc_nested;
 167 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
 168
 169 static DECLARE_WAIT_QUEUE_HEAD(motor_wait);
 170
 171 static volatile int selected = -1;      /* currently selected drive */
 172
 173 static int writepending;
 174 static int writefromint;
 175 static char *raw_buf;
 176
 177 #define RAW_BUF_SIZE 30000  /* size of raw disk data */
 178
 179 /*
 180  * These are global variables, as that's the easiest way to give
 181  * information to interrupts. They are the data used for the current
 182  * request.
 183  */
 184 static volatile char block_flag;
 185 static DECLARE_WAIT_QUEUE_HEAD(wait_fd_block);
 186
 187 /* MS-Dos MFM Coding tables (should go quick and easy) */
 188 static unsigned char mfmencode[16]={
 189         0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15,
 190         0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55
 191 };
 192 static unsigned char mfmdecode[128];
 193
 194 /* floppy internal millisecond timer stuff */
 195 static volatile int ms_busy = -1;
 196 static DECLARE_WAIT_QUEUE_HEAD(ms_wait);
 197 #define MS_TICKS ((amiga_eclock+50)/1000)
 198
 199 /*
 200  * Note that MAX_ERRORS=X doesn't imply that we retry every bad read
 201  * max X times - some types of errors increase the errorcount by 2 or
 202  * even 3, so we might actually retry only X/2 times before giving up.
 203  */
 204 #define MAX_ERRORS 12
 205
 206 /* Prevent "aliased" accesses. */
 207 static int fd_ref[4] = { 0,0,0,0 };
 208 static int fd_device[4] = { 0,0,0,0 };
 209
 210 /*
 211  * Current device number. Taken either from the block header or from the
 212  * format request descriptor.
 213  */
 214 #define CURRENT_DEVICE (CURRENT->rq_dev)
 215
 216 /* Current error count. */
 217 #define CURRENT_ERRORS (CURRENT->errors)
 218
 219
 220
 221 /*
 222  * Here come the actual hardware access and helper functions.
 223  * They are not reentrant and single threaded because all drives
 224  * share the same hardware and the same trackbuffer.
 225  */
 226
 227 /* Milliseconds timer */
 228
 229 static void ms_isr(int irq, void *dummy, struct pt_regs *fp)
 230 {
 231         ms_busy = -1;
 232         wake_up(&ms_wait);
 233 }
 234
 235 /* all waits are queued up
 236    A more generic routine would do a schedule a la timer.device */
 237 static void ms_delay(int ms)
 238 {
 239         unsigned long flags;
 240         int ticks;
 241         if (ms > 0) {
 242                 save_flags(flags);
 243                 cli();
 244                 while (ms_busy == 0)
 245                         sleep_on(&ms_wait);
 246                 ms_busy = 0;
 247                 restore_flags(flags);
 248                 ticks = MS_TICKS*ms-1;
 249                 ciaa.tblo=ticks%256;
 250                 ciaa.tbhi=ticks/256;
 251                 ciaa.crb=0x19; /*count eclock, force load, one-shoot, start */
 252                 sleep_on(&ms_wait);
 253         }
 254 }
 255
 256 /* Hardware semaphore */
 257
 258 /* returns true when we would get the semaphore */
 259 static inline int try_fdc(int drive)
 260 {
 261         drive &= 3;
 262         return ((fdc_busy < 0) || (fdc_busy == drive));
 263 }
 264
 265 static void get_fdc(int drive)
 266 {
 267         unsigned long flags;
 268
 269         drive &= 3;
 270 #ifdef DEBUG
 271         printk("get_fdc: drive %d  fdc_busy %d  fdc_nested %d\n",drive,fdc_busy,fdc_nested);
 272 #endif
 273         save_flags(flags);
 274         cli();
 275         while (!try_fdc(drive))
 276                 sleep_on(&fdc_wait);
 277         fdc_busy = drive;
 278         fdc_nested++;
 279         restore_flags(flags);
 280 }
 281
 282 static inline void rel_fdc(void)
 283 {
 284 #ifdef DEBUG
 285         if (fdc_nested == 0)
 286                 printk("fd: unmatched rel_fdc\n");
 287         printk("rel_fdc: fdc_busy %d fdc_nested %d\n",fdc_busy,fdc_nested);
 288 #endif
 289         fdc_nested--;
 290         if (fdc_nested == 0) {
 291                 fdc_busy = -1;
 292                 wake_up(&fdc_wait);
 293         }
 294 }
 295
 296 static void fd_select (int drive)
 297 {
 298         unsigned char prb = ~0;
 299
 300         drive&=3;
 301 #ifdef DEBUG
 302         printk("selecting %d\n",drive);
 303 #endif
 304         if (drive == selected)
 305                 return;
 306         get_fdc(drive);
 307         selected = drive;
 308
 309         if (unit[drive].track % 2 != 0)
 310                 prb &= ~DSKSIDE;
 311         if (unit[drive].motor == 1)
 312                 prb &= ~DSKMOTOR;
 313         ciab.prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
 314         ciab.prb = prb;
 315         prb &= ~SELMASK(drive);
 316         ciab.prb = prb;
 317         rel_fdc();
 318 }
 319
 320 static void fd_deselect (int drive)
 321 {
 322         unsigned char prb;
 323         unsigned long flags;
 324
 325         drive&=3;
 326 #ifdef DEBUG
 327         printk("deselecting %d\n",drive);
 328 #endif
 329         if (drive != selected) {
 330                 printk(KERN_WARNING "Deselecting drive %d while %d was selected!\n",drive,selected);
 331                 return;
 332         }
 333
 334         get_fdc(drive);
 335         save_flags (flags);
 336         cli();
 337
 338         selected = -1;
 339
 340         prb = ciab.prb;
 341         prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
 342         ciab.prb = prb;
 343
 344         restore_flags (flags);
 345         rel_fdc();
 346
 347 }
 348
 349 static void motor_on_callback(unsigned long nr)
 350 {
 351         if (!(ciaa.pra & DSKRDY) || --on_attempts == 0) {
 352                 wake_up (&motor_wait);
 353         } else {
 354                 motor_on_timer.expires = jiffies + HZ/10;
 355                 add_timer(&motor_on_timer);
 356         }
 357 }
 358
 359 static int fd_motor_on(int nr)
 360 {
 361         nr &= 3;
 362
 363         del_timer(motor_off_timer + nr);
 364
 365         if (!unit[nr].motor) {
 366                 unit[nr].motor = 1;
 367                 fd_select(nr);
 368
 369                 del_timer(&motor_on_timer);
 370                 motor_on_timer.data = nr;
 371                 motor_on_timer.expires = jiffies + HZ/2;
 372                 add_timer(&motor_on_timer);
 373
 374                 on_attempts = 10;
 375                 sleep_on (&motor_wait);
 376                 fd_deselect(nr);
 377         }
 378
 379         if (on_attempts == 0) {
 380                 on_attempts = -1;
 381 #if 0
 382                 printk (KERN_ERR "motor_on failed, turning motor off\n");
 383                 fd_motor_off (nr);
 384                 return 0;
 385 #else
 386                 printk (KERN_WARNING "DSKRDY not set after 1.5 seconds - assuming drive is spinning notwithstanding\n");
 387 #endif
 388         }
 389
 390         return 1;
 391 }
 392
 393 static void fd_motor_off(unsigned long drive)
 394 {
 395         long calledfromint;
 396 #ifdef MODULE
 397         long decusecount;
 398
 399         decusecount = drive & 0x40000000;
 400 #endif
 401         calledfromint = drive & 0x80000000;
 402         drive&=3;
 403         if (calledfromint && !try_fdc(drive)) {
 404                 /* We would be blocked in an interrupt, so try again later */
 405                 motor_off_timer[drive].expires = jiffies + 1;
 406                 add_timer(motor_off_timer + drive);
 407                 return;
 408         }
 409         unit[drive].motor = 0;
 410         fd_select(drive);
 411         udelay (1);
 412         fd_deselect(drive);
 413
 414 #ifdef MODULE
 415 /*
 416   this is the last interrupt for any drive access, happens after
 417   release (from floppy_off). So we have to wait until now to decrease
 418   the use count.
 419 */
 420         if (decusecount)
 421                 MOD_DEC_USE_COUNT;
 422 #endif
 423 }
 424
 425 static void floppy_off (unsigned int nr)
 426 {
 427         int drive;
 428
 429         drive = nr & 3;
 430         del_timer(motor_off_timer + drive);
 431         motor_off_timer[drive].expires = jiffies + 3*HZ;
 432         /* called this way it is always from interrupt */
 433         motor_off_timer[drive].data = nr | 0x80000000;
 434         add_timer(motor_off_timer + nr);
 435 }
 436
 437 static int fd_calibrate(int drive)
 438 {
 439         unsigned char prb;
 440         int n;
 441
 442         drive &= 3;
 443         get_fdc(drive);
 444         if (!fd_motor_on (drive))
 445                 return 0;
 446         fd_select (drive);
 447         prb = ciab.prb;
 448         prb |= DSKSIDE;
 449         prb &= ~DSKDIREC;
 450         ciab.prb = prb;
 451         for (n = unit[drive].type->tracks/2; n != 0; --n) {
 452                 if (ciaa.pra & DSKTRACK0)
 453                         break;
 454                 prb &= ~DSKSTEP;
 455                 ciab.prb = prb;
 456                 prb |= DSKSTEP;
 457                 udelay (2);
 458                 ciab.prb = prb;
 459                 ms_delay(unit[drive].type->step_delay);
 460         }
 461         ms_delay (unit[drive].type->settle_time);
 462         prb |= DSKDIREC;
 463         n = unit[drive].type->tracks + 20;
 464         for (;;) {
 465                 prb &= ~DSKSTEP;
 466                 ciab.prb = prb;
 467                 prb |= DSKSTEP;
 468                 udelay (2);
 469                 ciab.prb = prb;
 470                 ms_delay(unit[drive].type->step_delay + 1);
 471                 if ((ciaa.pra & DSKTRACK0) == 0)
 472                         break;
 473                 if (--n == 0) {
 474                         printk (KERN_ERR "fd%d: calibrate failed, turning motor off\n", drive);
 475                         fd_motor_off (drive);
 476                         unit[drive].track = -1;
 477                         rel_fdc();
 478                         return 0;
 479                 }
 480         }
 481         unit[drive].track = 0;
 482         ms_delay(unit[drive].type->settle_time);
 483
 484         rel_fdc();
 485         fd_deselect(drive);
 486         return 1;
 487 }
 488
 489 static int fd_seek(int drive, int track)
 490 {
 491         unsigned char prb;
 492         int cnt;
 493
 494 #ifdef DEBUG
 495         printk("seeking drive %d to track %d\n",drive,track);
 496 #endif
 497         drive &= 3;
 498         get_fdc(drive);
 499         if (unit[drive].track == track) {
 500                 rel_fdc();
 501                 return 1;
 502         }
 503         if (!fd_motor_on(drive)) {
 504                 rel_fdc();
 505                 return 0;
 506         }
 507         if (unit[drive].track < 0 && !fd_calibrate(drive)) {
 508                 rel_fdc();
 509                 return 0;
 510         }
 511
 512         fd_select (drive);
 513         cnt = unit[drive].track/2 - track/2;
 514         prb = ciab.prb;
 515         prb |= DSKSIDE | DSKDIREC;
 516         if (track % 2 != 0)
 517                 prb &= ~DSKSIDE;
 518         if (cnt < 0) {
 519                 cnt = - cnt;
 520                 prb &= ~DSKDIREC;
 521         }
 522         ciab.prb = prb;
 523         if (track % 2 != unit[drive].track % 2)
 524                 ms_delay (unit[drive].type->side_time);
 525         unit[drive].track = track;
 526         if (cnt == 0) {
 527                 rel_fdc();
 528                 fd_deselect(drive);
 529                 return 1;
 530         }
 531         do {
 532                 prb &= ~DSKSTEP;
 533                 ciab.prb = prb;
 534                 prb |= DSKSTEP;
 535                 udelay (1);
 536                 ciab.prb = prb;
 537                 ms_delay (unit[drive].type->step_delay);
 538         } while (--cnt != 0);
 539         ms_delay (unit[drive].type->settle_time);
 540
 541         rel_fdc();
 542         fd_deselect(drive);
 543         return 1;
 544 }
 545
 546 static unsigned long fd_get_drive_id(int drive)
 547 {
 548         int i;
 549         ulong id = 0;
 550
 551         drive&=3;
 552         get_fdc(drive);
 553         /* set up for ID */
 554         MOTOR_ON;
 555         udelay(2);
 556         SELECT(SELMASK(drive));
 557         udelay(2);
 558         DESELECT(SELMASK(drive));
 559         udelay(2);
 560         MOTOR_OFF;
 561         udelay(2);
 562         SELECT(SELMASK(drive));
 563         udelay(2);
 564         DESELECT(SELMASK(drive));
 565         udelay(2);
 566
 567         /* loop and read disk ID */
 568         for (i=0; i<32; i++) {
 569                 SELECT(SELMASK(drive));
 570                 udelay(2);
 571
 572                 /* read and store value of DSKRDY */
 573                 id <<= 1;
 574                 id |= (ciaa.pra & DSKRDY) ? 0 : 1;      /* cia regs are low-active! */
 575
 576                 DESELECT(SELMASK(drive));
 577         }
 578
 579         rel_fdc();
 580
 581         /*
 582          * RB: At least A500/A2000's df0: don't identify themselves.
 583          * As every (real) Amiga has at least a 3.5" DD drive as df0:
 584          * we default to that if df0: doesn't identify as a certain
 585          * type.
 586          */
 587         if(drive == 0 && id == FD_NODRIVE)
 588         {
 589                 id = fd_def_df0;
 590                 printk(KERN_NOTICE "fd: drive 0 didn't identify, setting default %08lx\n", (ulong)fd_def_df0);
 591         }
 592         /* return the ID value */
 593         return (id);
 594 }
 595
 596 static void fd_block_done(int irq, void *dummy, struct pt_regs *fp)
 597 {
 598         if (block_flag)
 599                 custom.dsklen = 0x4000;
 600
 601         if (block_flag == 2) { /* writing */
 602                 writepending = 2;
 603                 post_write_timer.expires = jiffies + 1; /* at least 2 ms */
 604                 post_write_timer.data = selected;
 605                 add_timer(&post_write_timer);
 606         }
 607         else {                /* reading */
 608                 block_flag = 0;
 609                 wake_up (&wait_fd_block);
 610         }
 611 }
 612
 613 static void raw_read(int drive)
 614 {
 615         drive&=3;
 616         get_fdc(drive);
 617         while (block_flag)
 618                 sleep_on(&wait_fd_block);
 619         fd_select(drive);
 620         /* setup adkcon bits correctly */
 621         custom.adkcon = ADK_MSBSYNC;
 622         custom.adkcon = ADK_SETCLR|ADK_WORDSYNC|ADK_FAST;
 623
 624         custom.dsksync = MFM_SYNC;
 625
 626         custom.dsklen = 0;
 627         custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf);
 628         custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN;
 629         custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN;
 630
 631         block_flag = 1;
 632
 633         while (block_flag)
 634                 sleep_on (&wait_fd_block);
 635
 636         custom.dsklen = 0;
 637         fd_deselect(drive);
 638         rel_fdc();
 639 }
 640
 641 static int raw_write(int drive)
 642 {
 643         ushort adk;
 644
 645         drive&=3;
 646         get_fdc(drive); /* corresponds to rel_fdc() in post_write() */
 647         if ((ciaa.pra & DSKPROT) == 0) {
 648                 rel_fdc();
 649                 return 0;
 650         }
 651         while (block_flag)
 652                 sleep_on(&wait_fd_block);
 653         fd_select(drive);
 654         /* clear adkcon bits */
 655         custom.adkcon = ADK_PRECOMP1|ADK_PRECOMP0|ADK_WORDSYNC|ADK_MSBSYNC;
 656         /* set appropriate adkcon bits */
 657         adk = ADK_SETCLR|ADK_FAST;
 658         if ((ulong)unit[drive].track >= unit[drive].type->precomp2)
 659                 adk |= ADK_PRECOMP1;
 660         else if ((ulong)unit[drive].track >= unit[drive].type->precomp1)
 661                 adk |= ADK_PRECOMP0;
 662         custom.adkcon = adk;
 663
 664         custom.dsklen = DSKLEN_WRITE;
 665         custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf);
 666         custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
 667         custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
 668
 669         block_flag = 2;
 670         return 1;
 671 }
 672
 673 /*
 674  * to be called at least 2ms after the write has finished but before any
 675  * other access to the hardware.
 676  */
 677 static void post_write (unsigned long drive)
 678 {
 679 #ifdef DEBUG
 680         printk("post_write for drive %ld\n",drive);
 681 #endif
 682         drive &= 3;
 683         custom.dsklen = 0;
 684         block_flag = 0;
 685         writepending = 0;
 686         writefromint = 0;
 687         unit[drive].dirty = 0;
 688         wake_up(&wait_fd_block);
 689         fd_deselect(drive);
 690         rel_fdc(); /* corresponds to get_fdc() in raw_write */
 691 }
 692
 693
 694 /*
 695  * The following functions are to convert the block contents into raw data
 696  * written to disk and vice versa.
 697  * (Add other formats here ;-))
 698  */
 699
 700 static unsigned long scan_sync(unsigned long raw, unsigned long end)
 701 {
 702         ushort *ptr = (ushort *)raw, *endp = (ushort *)end;
 703
 704         while (ptr < endp && *ptr++ != 0x4489)
 705                 ;
 706         if (ptr < endp) {
 707                 while (*ptr == 0x4489 && ptr < endp)
 708                         ptr++;
 709                 return (ulong)ptr;
 710         }
 711         return 0;
 712 }
 713
 714 static inline unsigned long checksum(unsigned long *addr, int len)
 715 {
 716         unsigned long csum = 0;
 717
 718         len /= sizeof(*addr);
 719         while (len-- > 0)
 720                 csum ^= *addr++;
 721         csum = ((csum>>1) & 0x55555555)  ^  (csum & 0x55555555);
 722
 723         return csum;
 724 }
 725
 726 static unsigned long decode (unsigned long *data, unsigned long *raw,
 727                              int len)
 728 {
 729         ulong *odd, *even;
 730
 731         /* convert length from bytes to longwords */
 732         len >>= 2;
 733         odd = raw;
 734         even = odd + len;
 735
 736         /* prepare return pointer */
 737         raw += len * 2;
 738
 739         do {
 740                 *data++ = ((*odd++ & 0x55555555) << 1) | (*even++ & 0x55555555);
 741         } while (--len != 0);
 742
 743         return (ulong)raw;
 744 }
 745
 746 struct header {
 747         unsigned char magic;
 748         unsigned char track;
 749         unsigned char sect;
 750         unsigned char ord;
 751         unsigned char labels[16];
 752         unsigned long hdrchk;
 753         unsigned long datachk;
 754 };
 755
 756 static int amiga_read(int drive)
 757 {
 758         unsigned long raw;
 759         unsigned long end;
 760         int scnt;
 761         unsigned long csum;
 762         struct header hdr;
 763
 764         drive&=3;
 765         raw = (long) raw_buf;
 766         end = raw + unit[drive].type->read_size;
 767
 768         for (scnt = 0;scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) {
 769                 if (!(raw = scan_sync(raw, end))) {
 770                         printk (KERN_INFO "can't find sync for sector %d\n", scnt);
 771                         return MFM_NOSYNC;
 772                 }
 773
 774                 raw = decode ((ulong *)&hdr.magic, (ulong *)raw, 4);
 775                 raw = decode ((ulong *)&hdr.labels, (ulong *)raw, 16);
 776                 raw = decode ((ulong *)&hdr.hdrchk, (ulong *)raw, 4);
 777                 raw = decode ((ulong *)&hdr.datachk, (ulong *)raw, 4);
 778                 csum = checksum((ulong *)&hdr,
 779                                 (char *)&hdr.hdrchk-(char *)&hdr);
 780
 781 #ifdef DEBUG
 782                 printk ("(%x,%d,%d,%d) (%lx,%lx,%lx,%lx) %lx %lx\n",
 783                         hdr.magic, hdr.track, hdr.sect, hdr.ord,
 784                         *(ulong *)&hdr.labels[0], *(ulong *)&hdr.labels[4],
 785                         *(ulong *)&hdr.labels[8], *(ulong *)&hdr.labels[12],
 786                         hdr.hdrchk, hdr.datachk);
 787 #endif
 788
 789                 if (hdr.hdrchk != csum) {
 790                         printk(KERN_INFO "MFM_HEADER: %08lx,%08lx\n", hdr.hdrchk, csum);
 791                         return MFM_HEADER;
 792                 }
 793
 794                 /* verify track */
 795                 if (hdr.track != unit[drive].track) {
 796                         printk(KERN_INFO "MFM_TRACK: %d, %d\n", hdr.track, unit[drive].track);
 797                         return MFM_TRACK;
 798                 }
 799
 800                 raw = decode ((ulong *)(unit[drive].trackbuf + hdr.sect*512),
 801                               (ulong *)raw, 512);
 802                 csum = checksum((ulong *)(unit[drive].trackbuf + hdr.sect*512), 512);
 803
 804                 if (hdr.datachk != csum) {
 805                         printk(KERN_INFO "MFM_DATA: (%x:%d:%d:%d) sc=%d %lx, %lx\n",
 806                                hdr.magic, hdr.track, hdr.sect, hdr.ord, scnt,
 807                                hdr.datachk, csum);
 808                         printk (KERN_INFO "data=(%lx,%lx,%lx,%lx)\n",
 809                                 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[0],
 810                                 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[1],
 811                                 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[2],
 812                                 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[3]);
 813                         return MFM_DATA;
 814                 }
 815         }
 816
 817         return 0;
 818 }
 819
 820 static void encode(unsigned long data, unsigned long *dest)
 821 {
 822         unsigned long data2;
 823
 824         data &= 0x55555555;
 825         data2 = data ^ 0x55555555;
 826         data |= ((data2 >> 1) | 0x80000000) & (data2 << 1);
 827
 828         if (*(dest - 1) & 0x00000001)
 829                 data &= 0x7FFFFFFF;
 830
 831         *dest = data;
 832 }
 833
 834 static void encode_block(unsigned long *dest, unsigned long *src, int len)
 835 {
 836         int cnt, to_cnt = 0;
 837         unsigned long data;
 838
 839         /* odd bits */
 840         for (cnt = 0; cnt < len / 4; cnt++) {
 841                 data = src[cnt] >> 1;
 842                 encode(data, dest + to_cnt++);
 843         }
 844
 845         /* even bits */
 846         for (cnt = 0; cnt < len / 4; cnt++) {
 847                 data = src[cnt];
 848                 encode(data, dest + to_cnt++);
 849         }
 850 }
 851
 852 static unsigned long *putsec(int disk, unsigned long *raw, int cnt)
 853 {
 854         struct header hdr;
 855         int i;
 856
 857         disk&=3;
 858         *raw = (raw[-1]&1) ? 0x2AAAAAAA : 0xAAAAAAAA;
 859         raw++;
 860         *raw++ = 0x44894489;
 861
 862         hdr.magic = 0xFF;
 863         hdr.track = unit[disk].track;
 864         hdr.sect = cnt;
 865         hdr.ord = unit[disk].dtype->sects * unit[disk].type->sect_mult - cnt;
 866         for (i = 0; i < 16; i++)
 867                 hdr.labels[i] = 0;
 868         hdr.hdrchk = checksum((ulong *)&hdr,
 869                               (char *)&hdr.hdrchk-(char *)&hdr);
 870         hdr.datachk = checksum((ulong *)(unit[disk].trackbuf+cnt*512), 512);
 871
 872         encode_block(raw, (ulong *)&hdr.magic, 4);
 873         raw += 2;
 874         encode_block(raw, (ulong *)&hdr.labels, 16);
 875         raw += 8;
 876         encode_block(raw, (ulong *)&hdr.hdrchk, 4);
 877         raw += 2;
 878         encode_block(raw, (ulong *)&hdr.datachk, 4);
 879         raw += 2;
 880         encode_block(raw, (ulong *)(unit[disk].trackbuf+cnt*512), 512);
 881         raw += 256;
 882
 883         return raw;
 884 }
 885
 886 static void amiga_write(int disk)
 887 {
 888         unsigned int cnt;
 889         unsigned long *ptr = (unsigned long *)raw_buf;
 890
 891         disk&=3;
 892         /* gap space */
 893         for (cnt = 0; cnt < 415 * unit[disk].type->sect_mult; cnt++)
 894                 *ptr++ = 0xaaaaaaaa;
 895
 896         /* sectors */
 897         for (cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++)
 898                 ptr = putsec (disk, ptr, cnt);
 899         *(ushort *)ptr = (ptr[-1]&1) ? 0x2AA8 : 0xAAA8;
 900 }
 901
 902
 903 struct dos_header {
 904         unsigned char track,   /* 0-80 */
 905                 side,    /* 0-1 */
 906                 sec,     /* 0-...*/
 907                 len_desc;/* 2 */
 908         unsigned short crc;     /* on 68000 we got an alignment problem,
 909                                    but this compiler solves it  by adding silently
 910                                    adding a pad byte so data won't fit
 911                                    and this took about 3h to discover.... */
 912         unsigned char gap1[22];     /* for longword-alignedness (0x4e) */
 913 };
 914
 915 /* crc routines are borrowed from the messydos-handler  */
 916
 917 /* excerpt from the messydos-device
 918 ; The CRC is computed not only over the actual data, but including
 919 ; the SYNC mark (3 * $a1) and the 'ID/DATA - Address Mark' ($fe/$fb).
 920 ; As we don't read or encode these fields into our buffers, we have to
 921 ; preload the registers containing the CRC with the values they would have
 922 ; after stepping over these fields.
 923 ;
 924 ; How CRCs "really" work:
 925 ;
 926 ; First, you should regard a bitstring as a series of coefficients of
 927 ; polynomials. We calculate with these polynomials in modulo-2
 928 ; arithmetic, in which both add and subtract are done the same as
 929 ; exclusive-or. Now, we modify our data (a very long polynomial) in
 930 ; such a way that it becomes divisible by the CCITT-standard 16-bit
 931 ;                16   12   5
 932 ; polynomial:   x  + x  + x + 1, represented by $11021. The easiest
 933 ; way to do this would be to multiply (using proper arithmetic) our
 934 ; datablock with $11021. So we have:
 935 ;   data * $11021                =
 936 ;   data * ($10000 + $1021)      =
 937 ;   data * $10000 + data * $1021
 938 ; The left part of this is simple: Just add two 0 bytes. But then
 939 ; the right part (data $1021) remains difficult and even could have
 940 ; a carry into the left part. The solution is to use a modified
 941 ; multiplication, which has a result that is not correct, but with
 942 ; a difference of any multiple of $11021. We then only need to keep
 943 ; the 16 least significant bits of the result.
 944 ;
 945 ; The following algorithm does this for us:
 946 ;
 947 ;   unsigned char *data, c, crclo, crchi;
 948 ;   while (not done) {
 949 ;       c = *data++ + crchi;
 950 ;       crchi = (@ c) >> 8 + crclo;
 951 ;       crclo = @ c;
 952 ;   }
 953 ;
 954 ; Remember, + is done with EOR, the @ operator is in two tables (high
 955 ; and low byte separately), which is calculated as
 956 ;
 957 ;      $1021 * (c & $F0)
 958 ;  xor $1021 * (c & $0F)
 959 ;  xor $1021 * (c >> 4)         (* is regular multiplication)
 960 ;
 961 ;
 962 ; Anyway, the end result is the same as the remainder of the division of
 963 ; the data by $11021. I am afraid I need to study theory a bit more...
 964
 965
 966 my only works was to code this from manx to C....
 967
 968 */
 969
 970 static ushort dos_crc(void * data_a3, int data_d0, int data_d1, int data_d3)
 971 {
 972         static unsigned char CRCTable1[] = {
 973                 0x00,0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x81,0x91,0xa1,0xb1,0xc1,0xd1,0xe1,0xf1,
 974                 0x12,0x02,0x32,0x22,0x52,0x42,0x72,0x62,0x93,0x83,0xb3,0xa3,0xd3,0xc3,0xf3,0xe3,
 975                 0x24,0x34,0x04,0x14,0x64,0x74,0x44,0x54,0xa5,0xb5,0x85,0x95,0xe5,0xf5,0xc5,0xd5,
 976                 0x36,0x26,0x16,0x06,0x76,0x66,0x56,0x46,0xb7,0xa7,0x97,0x87,0xf7,0xe7,0xd7,0xc7,
 977                 0x48,0x58,0x68,0x78,0x08,0x18,0x28,0x38,0xc9,0xd9,0xe9,0xf9,0x89,0x99,0xa9,0xb9,
 978                 0x5a,0x4a,0x7a,0x6a,0x1a,0x0a,0x3a,0x2a,0xdb,0xcb,0xfb,0xeb,0x9b,0x8b,0xbb,0xab,
 979                 0x6c,0x7c,0x4c,0x5c,0x2c,0x3c,0x0c,0x1c,0xed,0xfd,0xcd,0xdd,0xad,0xbd,0x8d,0x9d,
 980                 0x7e,0x6e,0x5e,0x4e,0x3e,0x2e,0x1e,0x0e,0xff,0xef,0xdf,0xcf,0xbf,0xaf,0x9f,0x8f,
 981                 0x91,0x81,0xb1,0xa1,0xd1,0xc1,0xf1,0xe1,0x10,0x00,0x30,0x20,0x50,0x40,0x70,0x60,
 982                 0x83,0x93,0xa3,0xb3,0xc3,0xd3,0xe3,0xf3,0x02,0x12,0x22,0x32,0x42,0x52,0x62,0x72,
 983                 0xb5,0xa5,0x95,0x85,0xf5,0xe5,0xd5,0xc5,0x34,0x24,0x14,0x04,0x74,0x64,0x54,0x44,
 984                 0xa7,0xb7,0x87,0x97,0xe7,0xf7,0xc7,0xd7,0x26,0x36,0x06,0x16,0x66,0x76,0x46,0x56,
 985                 0xd9,0xc9,0xf9,0xe9,0x99,0x89,0xb9,0xa9,0x58,0x48,0x78,0x68,0x18,0x08,0x38,0x28,
 986                 0xcb,0xdb,0xeb,0xfb,0x8b,0x9b,0xab,0xbb,0x4a,0x5a,0x6a,0x7a,0x0a,0x1a,0x2a,0x3a,
 987                 0xfd,0xed,0xdd,0xcd,0xbd,0xad,0x9d,0x8d,0x7c,0x6c,0x5c,0x4c,0x3c,0x2c,0x1c,0x0c,
 988                 0xef,0xff,0xcf,0xdf,0xaf,0xbf,0x8f,0x9f,0x6e,0x7e,0x4e,0x5e,0x2e,0x3e,0x0e,0x1e
 989         };
 990
 991         static unsigned char CRCTable2[] = {
 992                 0x00,0x21,0x42,0x63,0x84,0xa5,0xc6,0xe7,0x08,0x29,0x4a,0x6b,0x8c,0xad,0xce,0xef,
 993                 0x31,0x10,0x73,0x52,0xb5,0x94,0xf7,0xd6,0x39,0x18,0x7b,0x5a,0xbd,0x9c,0xff,0xde,
 994                 0x62,0x43,0x20,0x01,0xe6,0xc7,0xa4,0x85,0x6a,0x4b,0x28,0x09,0xee,0xcf,0xac,0x8d,
 995                 0x53,0x72,0x11,0x30,0xd7,0xf6,0x95,0xb4,0x5b,0x7a,0x19,0x38,0xdf,0xfe,0x9d,0xbc,
 996                 0xc4,0xe5,0x86,0xa7,0x40,0x61,0x02,0x23,0xcc,0xed,0x8e,0xaf,0x48,0x69,0x0a,0x2b,
 997                 0xf5,0xd4,0xb7,0x96,0x71,0x50,0x33,0x12,0xfd,0xdc,0xbf,0x9e,0x79,0x58,0x3b,0x1a,
 998                 0xa6,0x87,0xe4,0xc5,0x22,0x03,0x60,0x41,0xae,0x8f,0xec,0xcd,0x2a,0x0b,0x68,0x49,
 999                 0x97,0xb6,0xd5,0xf4,0x13,0x32,0x51,0x70,0x9f,0xbe,0xdd,0xfc,0x1b,0x3a,0x59,0x78,
1000                 0x88,0xa9,0xca,0xeb,0x0c,0x2d,0x4e,0x6f,0x80,0xa1,0xc2,0xe3,0x04,0x25,0x46,0x67,
1001                 0xb9,0x98,0xfb,0xda,0x3d,0x1c,0x7f,0x5e,0xb1,0x90,0xf3,0xd2,0x35,0x14,0x77,0x56,
1002                 0xea,0xcb,0xa8,0x89,0x6e,0x4f,0x2c,0x0d,0xe2,0xc3,0xa0,0x81,0x66,0x47,0x24,0x05,
1003                 0xdb,0xfa,0x99,0xb8,0x5f,0x7e,0x1d,0x3c,0xd3,0xf2,0x91,0xb0,0x57,0x76,0x15,0x34,
1004                 0x4c,0x6d,0x0e,0x2f,0xc8,0xe9,0x8a,0xab,0x44,0x65,0x06,0x27,0xc0,0xe1,0x82,0xa3,
1005                 0x7d,0x5c,0x3f,0x1e,0xf9,0xd8,0xbb,0x9a,0x75,0x54,0x37,0x16,0xf1,0xd0,0xb3,0x92,
1006                 0x2e,0x0f,0x6c,0x4d,0xaa,0x8b,0xe8,0xc9,0x26,0x07,0x64,0x45,0xa2,0x83,0xe0,0xc1,
1007                 0x1f,0x3e,0x5d,0x7c,0x9b,0xba,0xd9,0xf8,0x17,0x36,0x55,0x74,0x93,0xb2,0xd1,0xf0
1008         };
1009
1010 /* look at the asm-code - what looks in C a bit strange is almost as good as handmade */
1011         register int i;
1012         register unsigned char *CRCT1, *CRCT2, *data, c, crch, crcl;
1013
1014         CRCT1=CRCTable1;
1015         CRCT2=CRCTable2;
1016         data=data_a3;
1017         crcl=data_d1;
1018         crch=data_d0;
1019         for (i=data_d3; i>=0; i--) {
1020                 c = (*data++) ^ crch;
1021                 crch = CRCT1[c] ^ crcl;
1022                 crcl = CRCT2[c];
1023         }
1024         return (crch<<8)|crcl;
1025 }
1026
1027 static inline ushort dos_hdr_crc (struct dos_header *hdr)
1028 {
1029         return dos_crc(&(hdr->track), 0xb2, 0x30, 3); /* precomputed magic */
1030 }
1031
1032 static inline ushort dos_data_crc(unsigned char *data)
1033 {
1034         return dos_crc(data, 0xe2, 0x95 ,511); /* precomputed magic */
1035 }
1036
1037 static inline unsigned char dos_decode_byte(ushort word)
1038 {
1039         register ushort w2;
1040         register unsigned char byte;
1041         register unsigned char *dec = mfmdecode;
1042
1043         w2=word;
1044         w2>>=8;
1045         w2&=127;
1046         byte = dec[w2];
1047         byte <<= 4;
1048         w2 = word & 127;
1049         byte |= dec[w2];
1050         return byte;
1051 }
1052
1053 static unsigned long dos_decode(unsigned char *data, unsigned short *raw, int len)
1054 {
1055         int i;
1056
1057         for (i = 0; i < len; i++)
1058                 *data++=dos_decode_byte(*raw++);
1059         return ((ulong)raw);
1060 }
1061
1062 #ifdef DEBUG
1063 static void dbg(unsigned long ptr)
1064 {
1065         printk("raw data @%08lx: %08lx, %08lx ,%08lx, %08lx\n", ptr,
1066                ((ulong *)ptr)[0], ((ulong *)ptr)[1],
1067                ((ulong *)ptr)[2], ((ulong *)ptr)[3]);
1068 }
1069 #endif
1070
1071 static int dos_read(int drive)
1072 {
1073         unsigned long end;
1074         unsigned long raw;
1075         int scnt;
1076         unsigned short crc,data_crc[2];
1077         struct dos_header hdr;
1078
1079         drive&=3;
1080         raw = (long) raw_buf;
1081         end = raw + unit[drive].type->read_size;
1082
1083         for (scnt=0; scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) {
1084                 do { /* search for the right sync of each sec-hdr */
1085                         if (!(raw = scan_sync (raw, end))) {
1086                                 printk(KERN_INFO "dos_read: no hdr sync on "
1087                                        "track %d, unit %d for sector %d\n",
1088                                        unit[drive].track,drive,scnt);
1089                                 return MFM_NOSYNC;
1090                         }
1091 #ifdef DEBUG
1092                         dbg(raw);
1093 #endif
1094                 } while (*((ushort *)raw)!=0x5554); /* loop usually only once done */
1095                 raw+=2; /* skip over headermark */
1096                 raw = dos_decode((unsigned char *)&hdr,(ushort *) raw,8);
1097                 crc = dos_hdr_crc(&hdr);
1098
1099 #ifdef DEBUG
1100                 printk("(%3d,%d,%2d,%d) %x\n", hdr.track, hdr.side,
1101                        hdr.sec, hdr.len_desc, hdr.crc);
1102 #endif
1103
1104                 if (crc != hdr.crc) {
1105                         printk(KERN_INFO "dos_read: MFM_HEADER %04x,%04x\n",
1106                                hdr.crc, crc);
1107                         return MFM_HEADER;
1108                 }
1109                 if (hdr.track != unit[drive].track/unit[drive].type->heads) {
1110                         printk(KERN_INFO "dos_read: MFM_TRACK %d, %d\n",
1111                                hdr.track,
1112                                unit[drive].track/unit[drive].type->heads);
1113                         return MFM_TRACK;
1114                 }
1115
1116                 if (hdr.side != unit[drive].track%unit[drive].type->heads) {
1117                         printk(KERN_INFO "dos_read: MFM_SIDE %d, %d\n",
1118                                hdr.side,
1119                                unit[drive].track%unit[drive].type->heads);
1120                         return MFM_TRACK;
1121                 }
1122
1123                 if (hdr.len_desc != 2) {
1124                         printk(KERN_INFO "dos_read: unknown sector len "
1125                                "descriptor %d\n", hdr.len_desc);
1126                         return MFM_DATA;
1127                 }
1128 #ifdef DEBUG
1129                 printk("hdr accepted\n");
1130 #endif
1131                 if (!(raw = scan_sync (raw, end))) {
1132                         printk(KERN_INFO "dos_read: no data sync on track "
1133                                "%d, unit %d for sector%d, disk sector %d\n",
1134                                unit[drive].track, drive, scnt, hdr.sec);
1135                         return MFM_NOSYNC;
1136                 }
1137 #ifdef DEBUG
1138                 dbg(raw);
1139 #endif
1140
1141                 if (*((ushort *)raw)!=0x5545) {
1142                         printk(KERN_INFO "dos_read: no data mark after "
1143                                "sync (%d,%d,%d,%d) sc=%d\n",
1144                                hdr.track,hdr.side,hdr.sec,hdr.len_desc,scnt);
1145                         return MFM_NOSYNC;
1146                 }
1147
1148                 raw+=2;  /* skip data mark (included in checksum) */
1149                 raw = dos_decode((unsigned char *)(unit[drive].trackbuf + (hdr.sec - 1) * 512), (ushort *) raw, 512);
1150                 raw = dos_decode((unsigned char  *)data_crc,(ushort *) raw,4);
1151                 crc = dos_data_crc(unit[drive].trackbuf + (hdr.sec - 1) * 512);
1152
1153                 if (crc != data_crc[0]) {
1154                         printk(KERN_INFO "dos_read: MFM_DATA (%d,%d,%d,%d) "
1155                                "sc=%d, %x %x\n", hdr.track, hdr.side,
1156                                hdr.sec, hdr.len_desc, scnt,data_crc[0], crc);
1157                         printk(KERN_INFO "data=(%lx,%lx,%lx,%lx,...)\n",
1158                                ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[0],
1159                                ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[1],
1160                                ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[2],
1161                                ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[3]);
1162                         return MFM_DATA;
1163                 }
1164         }
1165         return 0;
1166 }
1167
1168 static inline ushort dos_encode_byte(unsigned char byte)
1169 {
1170         register unsigned char *enc, b2, b1;
1171         register ushort word;
1172
1173         enc=mfmencode;
1174         b1=byte;
1175         b2=b1>>4;
1176         b1&=15;
1177         word=enc[b2] <<8 | enc [b1];
1178         return (word|((word&(256|64)) ? 0: 128));
1179 }
1180
1181 static void dos_encode_block(ushort *dest, unsigned char *src, int len)
1182 {
1183         int i;
1184
1185         for (i = 0; i < len; i++) {
1186                 *dest=dos_encode_byte(*src++);
1187                 *dest|=((dest[-1]&1)||(*dest&0x4000))? 0: 0x8000;
1188                 dest++;
1189         }
1190 }
1191
1192 static unsigned long *ms_putsec(int drive, unsigned long *raw, int cnt)
1193 {
1194         static struct dos_header hdr={0,0,0,2,0,
1195           {78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78}};
1196         int i;
1197         static ushort crc[2]={0,0x4e4e};
1198
1199         drive&=3;
1200 /* id gap 1 */
1201 /* the MFM word before is always 9254 */
1202         for(i=0;i<6;i++)
1203                 *raw++=0xaaaaaaaa;
1204 /* 3 sync + 1 headermark */
1205         *raw++=0x44894489;
1206         *raw++=0x44895554;
1207
1208 /* fill in the variable parts of the header */
1209         hdr.track=unit[drive].track/unit[drive].type->heads;
1210         hdr.side=unit[drive].track%unit[drive].type->heads;
1211         hdr.sec=cnt+1;
1212         hdr.crc=dos_hdr_crc(&hdr);
1213
1214 /* header (without "magic") and id gap 2*/
1215         dos_encode_block((ushort *)raw,(unsigned char *) &hdr.track,28);
1216         raw+=14;
1217
1218 /*id gap 3 */
1219         for(i=0;i<6;i++)
1220                 *raw++=0xaaaaaaaa;
1221
1222 /* 3 syncs and 1 datamark */
1223         *raw++=0x44894489;
1224         *raw++=0x44895545;
1225
1226 /* data */
1227         dos_encode_block((ushort *)raw,
1228                          (unsigned char *)unit[drive].trackbuf+cnt*512,512);
1229         raw+=256;
1230
1231 /*data crc + jd's special gap (long words :-/) */
1232         crc[0]=dos_data_crc(unit[drive].trackbuf+cnt*512);
1233         dos_encode_block((ushort *) raw,(unsigned char *)crc,4);
1234         raw+=2;
1235
1236 /* data gap */
1237         for(i=0;i<38;i++)
1238                 *raw++=0x92549254;
1239
1240         return raw; /* wrote 652 MFM words */
1241 }
1242
1243 static void dos_write(int disk)
1244 {
1245         int cnt;
1246         unsigned long raw = (unsigned long) raw_buf;
1247         unsigned long *ptr=(unsigned long *)raw;
1248
1249         disk&=3;
1250 /* really gap4 + indexgap , but we write it first and round it up */
1251         for (cnt=0;cnt<425;cnt++)
1252                 *ptr++=0x92549254;
1253
1254 /* the following is just guessed */
1255         if (unit[disk].type->sect_mult==2)  /* check for HD-Disks */
1256                 for(cnt=0;cnt<473;cnt++)
1257                         *ptr++=0x92549254;
1258
1259 /* now the index marks...*/
1260         for (cnt=0;cnt<20;cnt++)
1261                 *ptr++=0x92549254;
1262         for (cnt=0;cnt<6;cnt++)
1263                 *ptr++=0xaaaaaaaa;
1264         *ptr++=0x52245224;
1265         *ptr++=0x52245552;
1266         for (cnt=0;cnt<20;cnt++)
1267                 *ptr++=0x92549254;
1268
1269 /* sectors */
1270         for(cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++)
1271                 ptr=ms_putsec(disk,ptr,cnt);
1272
1273         *(ushort *)ptr = 0xaaa8; /* MFM word before is always 0x9254 */
1274 }
1275
1276 /*
1277  * Here comes the high level stuff (i.e. the filesystem interface)
1278  * and helper functions.
1279  * Normally this should be the only part that has to be adapted to
1280  * different kernel versions.
1281  */
1282
1283 /* FIXME: this assumes the drive is still spinning -
1284  * which is only true if we complete writing a track within three seconds
1285  */
1286 static void flush_track_callback(unsigned long nr)
1287 {
1288         nr&=3;
1289         writefromint = 1;
1290         if (!try_fdc(nr)) {
1291                 /* we might block in an interrupt, so try again later */
1292                 flush_track_timer[nr].expires = jiffies + 1;
1293                 add_timer(flush_track_timer + nr);
1294                 return;
1295         }
1296         get_fdc(nr);
1297         (*unit[nr].dtype->write_fkt)(nr);
1298         if (!raw_write(nr)) {
1299                 printk (KERN_NOTICE "floppy disk write protected\n");
1300                 writefromint = 0;
1301                 writepending = 0;
1302         }
1303         rel_fdc();
1304 }
1305
1306 static int non_int_flush_track (unsigned long nr)
1307 {
1308         unsigned long flags;
1309
1310         nr&=3;
1311         writefromint = 0;
1312         del_timer(&post_write_timer);
1313         get_fdc(nr);
1314         if (!fd_motor_on(nr)) {
1315                 writepending = 0;
1316                 rel_fdc();
1317                 return 0;
1318         }
1319         save_flags(flags);
1320         cli();
1321         if (writepending != 2) {
1322                 restore_flags(flags);
1323                 (*unit[nr].dtype->write_fkt)(nr);
1324                 if (!raw_write(nr)) {
1325                         printk (KERN_NOTICE "floppy disk write protected "
1326                                 "in write!\n");
1327                         writepending = 0;
1328                         return 0;
1329                 }
1330                 while (block_flag == 2)
1331                         sleep_on (&wait_fd_block);
1332         }
1333         else {
1334                 restore_flags(flags);
1335                 ms_delay(2); /* 2 ms post_write delay */
1336                 post_write(nr);
1337         }
1338         rel_fdc();
1339         return 1;
1340 }
1341
1342 static int get_track(int drive, int track)
1343 {
1344         int error, errcnt;
1345
1346         drive&=3;
1347         if (unit[drive].track == track)
1348                 return 0;
1349         get_fdc(drive);
1350         if (!fd_motor_on(drive)) {
1351                 rel_fdc();
1352                 return -1;
1353         }
1354
1355         if (unit[drive].dirty == 1) {
1356                 del_timer (flush_track_timer + drive);
1357                 non_int_flush_track (drive);
1358         }
1359         errcnt = 0;
1360         while (errcnt < MAX_ERRORS) {
1361                 if (!fd_seek(drive, track))
1362                         return -1;
1363                 raw_read(drive);
1364                 error = (*unit[drive].dtype->read_fkt)(drive);
1365                 if (error == 0) {
1366                         rel_fdc();
1367                         return 0;
1368                 }
1369                 /* Read Error Handling: recalibrate and try again */
1370                 unit[drive].track = -1;
1371                 errcnt++;
1372         }
1373         rel_fdc();
1374         return -1;
1375 }
1376
1377 static void redo_fd_request(void)
1378 {
1379         unsigned int cnt, block, track, sector;
1380         int device, drive;
1381         struct amiga_floppy_struct *floppy;
1382         char *data;
1383         unsigned long flags;
1384
1385         if (!QUEUE_EMPTY && CURRENT->rq_status == RQ_INACTIVE){
1386                 return;
1387         }
1388
1389  repeat:
1390         if (QUEUE_EMPTY) {
1391                 /* Nothing left to do */
1392                 return;
1393         }
1394
1395         if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
1396                 panic(DEVICE_NAME ": request list destroyed");
1397
1398         if (CURRENT->bh && !buffer_locked(CURRENT->bh))
1399                 panic(DEVICE_NAME ": block not locked");
1400
1401         device = MINOR(CURRENT_DEVICE);
1402         if (device < 8) {
1403                 /* manual selection */
1404                 drive = device & 3;
1405                 floppy = unit + drive;
1406         } else {
1407                 /* Auto-detection */
1408 #ifdef DEBUG
1409                 printk("redo_fd_request: can't handle auto detect\n");
1410                 printk("redo_fd_request: default to normal\n");
1411 #endif
1412                 drive = device & 3;
1413                 floppy = unit + drive;
1414         }
1415
1416         /* Here someone could investigate to be more efficient */
1417         for (cnt = 0; cnt < CURRENT->current_nr_sectors; cnt++) {
1418 #ifdef DEBUG
1419                 printk("fd: sector %ld + %d requested for %s\n",
1420                        CURRENT->sector,cnt,
1421                        (CURRENT->cmd==READ)?"read":"write");
1422 #endif
1423                 block = CURRENT->sector + cnt;
1424                 if ((int)block > floppy->blocks) {
1425                         end_request(0);
1426                         goto repeat;
1427                 }
1428
1429                 track = block / (floppy->dtype->sects * floppy->type->sect_mult);
1430                 sector = block % (floppy->dtype->sects * floppy->type->sect_mult);
1431                 data = CURRENT->buffer + 512 * cnt;
1432 #ifdef DEBUG
1433                 printk("access to track %d, sector %d, with buffer at "
1434                        "0x%08lx\n", track, sector, data);
1435 #endif
1436
1437                 if ((CURRENT->cmd != READ) && (CURRENT->cmd != WRITE)) {
1438                         printk(KERN_WARNING "do_fd_request: unknown command\n");
1439                         end_request(0);
1440                         goto repeat;
1441                 }
1442                 if (get_track(drive, track) == -1) {
1443                         end_request(0);
1444                         goto repeat;
1445                 }
1446
1447                 switch (CURRENT->cmd) {
1448                 case READ:
1449                         memcpy(data, unit[drive].trackbuf + sector * 512, 512);
1450                         break;
1451
1452                 case WRITE:
1453                         memcpy(unit[drive].trackbuf + sector * 512, data, 512);
1454
1455                         /* keep the drive spinning while writes are scheduled */
1456                         if (!fd_motor_on(drive)) {
1457                                 end_request(0);
1458                                 goto repeat;
1459                         }
1460                         /*
1461                          * setup a callback to write the track buffer
1462                          * after a short (1 tick) delay.
1463                          */
1464                         save_flags (flags);
1465                         cli();
1466
1467                         unit[drive].dirty = 1;
1468                         /* reset the timer */
1469                         del_timer (flush_track_timer + drive);
1470
1471                         flush_track_timer[drive].expires = jiffies + 1;
1472                         add_timer (flush_track_timer + drive);
1473                         restore_flags (flags);
1474                         break;
1475                 }
1476         }
1477         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
1478         CURRENT->sector += CURRENT->current_nr_sectors;
1479
1480         end_request(1);
1481         goto repeat;
1482 }
1483
1484 static void do_fd_request(request_queue_t * q)
1485 {
1486         redo_fd_request();
1487 }
1488
1489 static int fd_ioctl(struct inode *inode, struct file *filp,
1490                     unsigned int cmd, unsigned long param)
1491 {
1492         int drive = inode->i_rdev & 3;
1493         static struct floppy_struct getprm;
1494
1495         switch(cmd){
1496         case HDIO_GETGEO:
1497         {
1498                 struct hd_geometry loc;
1499                 loc.heads = unit[drive].type->heads;
1500                 loc.sectors = unit[drive].dtype->sects * unit[drive].type->sect_mult;
1501                 loc.cylinders = unit[drive].type->tracks;
1502                 loc.start = 0;
1503                 if (copy_to_user((void *)param, (void *)&loc,
1504                                  sizeof(struct hd_geometry)))
1505                         return -EFAULT;
1506                 break;
1507         }
1508         case FDFMTBEG:
1509                 get_fdc(drive);
1510                 if (fd_ref[drive] > 1) {
1511                         rel_fdc();
1512                         return -EBUSY;
1513                 }
1514                 fsync_dev(inode->i_rdev);
1515                 if (fd_motor_on(drive) == 0) {
1516                         rel_fdc();
1517                         return -ENODEV;
1518                 }
1519                 if (fd_calibrate(drive) == 0) {
1520                         rel_fdc();
1521                         return -ENXIO;
1522                 }
1523                 floppy_off(drive);
1524                 rel_fdc();
1525                 break;
1526         case FDFMTTRK:
1527                 if (param < unit[drive].type->tracks * unit[drive].type->heads)
1528                 {
1529                         get_fdc(drive);
1530                         if (fd_seek(drive,param) != 0){
1531                                 memset(unit[drive].trackbuf, FD_FILL_BYTE,
1532                                        unit[drive].dtype->sects * unit[drive].type->sect_mult * 512);
1533                                 non_int_flush_track(drive);
1534                         }
1535                         floppy_off(drive);
1536                         rel_fdc();
1537                 }
1538                 else
1539                         return -EINVAL;
1540                 break;
1541         case FDFMTEND:
1542                 floppy_off(drive);
1543                 invalidate_device(inode->i_rdev, 0);
1544                 break;
1545         case FDGETPRM:
1546                 memset((void *)&getprm, 0, sizeof (getprm));
1547                 getprm.track=unit[drive].type->tracks;
1548                 getprm.head=unit[drive].type->heads;
1549                 getprm.sect=unit[drive].dtype->sects * unit[drive].type->sect_mult;
1550                 getprm.size=unit[drive].blocks;
1551                 if (copy_to_user((void *)param,
1552                                  (void *)&getprm,
1553                                  sizeof(struct floppy_struct)))
1554                         return -EFAULT;
1555                 break;
1556         case BLKGETSIZE:
1557                 return put_user(unit[drive].blocks,(unsigned long *)param);
1558                 break;
1559         case BLKGETSIZE64:
1560                 return put_user((u64)unit[drive].blocks << 9, (u64 *)param);
1561                 break;
1562         case FDSETPRM:
1563         case FDDEFPRM:
1564                 return -EINVAL;
1565         case FDFLUSH: /* unconditionally, even if not needed */
1566                 del_timer (flush_track_timer + drive);
1567                 non_int_flush_track(drive);
1568                 break;
1569 #ifdef RAW_IOCTL
1570         case IOCTL_RAW_TRACK:
1571                 if (copy_to_user((void *)param, raw_buf,
1572                                  unit[drive].type->read_size))
1573                         return -EFAULT;
1574                 else
1575                         return unit[drive].type->read_size;
1576 #endif
1577         default:
1578                 printk(KERN_DEBUG "fd_ioctl: unknown cmd %d for drive %d.",
1579                        cmd, drive);
1580                 return -ENOSYS;
1581         }
1582         return 0;
1583 }
1584
1585 static void fd_probe(int dev)
1586 {
1587         unsigned long code;
1588         int type;
1589         int drive;
1590
1591         drive = dev & 3;
1592         code = fd_get_drive_id(drive);
1593
1594         /* get drive type */
1595         for (type = 0; type < num_dr_types; type++)
1596                 if (drive_types[type].code == code)
1597                         break;
1598
1599         if (type >= num_dr_types) {
1600                 printk(KERN_WARNING "fd_probe: unsupported drive type "
1601                        "%08lx found\n", code);
1602                 unit[drive].type = &drive_types[num_dr_types-1]; /* FD_NODRIVE */
1603                 return;
1604         }
1605
1606         unit[drive].type = drive_types + type;
1607         unit[drive].track = -1;
1608
1609         unit[drive].disk = -1;
1610         unit[drive].motor = 0;
1611         unit[drive].busy = 0;
1612         unit[drive].status = -1;
1613 }
1614
1615 /*
1616  * floppy_open check for aliasing (/dev/fd0 can be the same as
1617  * /dev/PS0 etc), and disallows simultaneous access to the same
1618  * drive with different device numbers.
1619  */
1620 static int floppy_open(struct inode *inode, struct file *filp)
1621 {
1622         int drive;
1623         int old_dev;
1624         int system;
1625         unsigned long flags;
1626
1627         drive = MINOR(inode->i_rdev) & 3;
1628         old_dev = fd_device[drive];
1629
1630         if (fd_ref[drive])
1631                 if (old_dev != inode->i_rdev)
1632                         return -EBUSY;
1633
1634         if (unit[drive].type->code == FD_NODRIVE)
1635                 return -ENODEV;
1636
1637         if (filp && filp->f_mode & 3) {
1638                 check_disk_change(inode->i_rdev);
1639                 if (filp->f_mode & 2 ) {
1640                         int wrprot;
1641
1642                         get_fdc(drive);
1643                         fd_select (drive);
1644                         wrprot = !(ciaa.pra & DSKPROT);
1645                         fd_deselect (drive);
1646                         rel_fdc();
1647
1648                         if (wrprot)
1649                                 return -EROFS;
1650                 }
1651         }
1652
1653         save_flags(flags);
1654         cli();
1655         fd_ref[drive]++;
1656         fd_device[drive] = inode->i_rdev;
1657 #ifdef MODULE
1658         if (unit[drive].motor == 0)
1659                 MOD_INC_USE_COUNT;
1660 #endif
1661         restore_flags(flags);
1662
1663         if (old_dev && old_dev != inode->i_rdev)
1664                 invalidate_buffers(old_dev);
1665
1666         system=(inode->i_rdev & 4)>>2;
1667         unit[drive].dtype=&data_types[system];
1668         unit[drive].blocks=unit[drive].type->heads*unit[drive].type->tracks*
1669                 data_types[system].sects*unit[drive].type->sect_mult;
1670         floppy_sizes[MINOR(inode->i_rdev)] = unit[drive].blocks >> 1;
1671
1672         printk(KERN_INFO "fd%d: accessing %s-disk with %s-layout\n",drive,
1673                unit[drive].type->name, data_types[system].name);
1674
1675         return 0;
1676 }
1677
1678 static int floppy_release(struct inode * inode, struct file * filp)
1679 {
1680         int drive = MINOR(inode->i_rdev) & 3;
1681
1682         if (unit[drive].dirty == 1) {
1683                 del_timer (flush_track_timer + drive);
1684                 non_int_flush_track (drive);
1685         }
1686
1687         if (!fd_ref[drive]--) {
1688                 printk(KERN_CRIT "floppy_release with fd_ref == 0");
1689                 fd_ref[drive] = 0;
1690         }
1691 #ifdef MODULE
1692 /* the mod_use counter is handled this way */
1693         floppy_off (drive | 0x40000000);
1694 #endif
1695         return 0;
1696 }
1697
1698 /*
1699  * floppy-change is never called from an interrupt, so we can relax a bit
1700  * here, sleep etc. Note that floppy-on tries to set current_DOR to point
1701  * to the desired drive, but it will probably not survive the sleep if
1702  * several floppies are used at the same time: thus the loop.
1703  */
1704 static int amiga_floppy_change(kdev_t dev)
1705 {
1706         int drive = MINOR(dev) & 3;
1707         int changed;
1708         static int first_time = 1;
1709
1710         if (MAJOR(dev) != MAJOR_NR) {
1711                 printk(KERN_CRIT "floppy_change: not a floppy\n");
1712                 return 0;
1713         }
1714
1715         if (first_time)
1716                 changed = first_time--;
1717         else {
1718                 get_fdc(drive);
1719                 fd_select (drive);
1720                 changed = !(ciaa.pra & DSKCHANGE);
1721                 fd_deselect (drive);
1722                 rel_fdc();
1723         }
1724
1725         if (changed) {
1726                 fd_probe(drive);
1727                 unit[drive].track = -1;
1728                 unit[drive].dirty = 0;
1729                 writepending = 0; /* if this was true before, too bad! */
1730                 writefromint = 0;
1731                 return 1;
1732         }
1733         return 0;
1734 }
1735
1736 static struct block_device_operations floppy_fops = {
1737         owner:                  THIS_MODULE,
1738         open:                   floppy_open,
1739         release:                floppy_release,
1740         ioctl:                  fd_ioctl,
1741         check_media_change:     amiga_floppy_change,
1742 };
1743
1744 void __init amiga_floppy_setup (char *str, int *ints)
1745 {
1746         printk (KERN_INFO "amiflop: Setting default df0 to %x\n", ints[1]);
1747         fd_def_df0 = ints[1];
1748 }
1749
1750 static int __init fd_probe_drives(void)
1751 {
1752         int drive,drives,nomem;
1753
1754         printk(KERN_INFO "FD: probing units\n" KERN_INFO "found ");
1755         drives=0;
1756         nomem=0;
1757         for(drive=0;drive<FD_MAX_UNITS;drive++) {
1758                 fd_probe(drive);
1759                 if (unit[drive].type->code != FD_NODRIVE) {
1760                         drives++;
1761                         if ((unit[drive].trackbuf = kmalloc(FLOPPY_MAX_SECTORS * 512, GFP_KERNEL)) == NULL) {
1762                                 printk("no mem for ");
1763                                 unit[drive].type = &drive_types[num_dr_types - 1]; /* FD_NODRIVE */
1764                                 drives--;
1765                                 nomem = 1;
1766                         }
1767                         printk("fd%d ",drive);
1768                 }
1769         }
1770         if ((drives > 0) || (nomem == 0)) {
1771                 if (drives == 0)
1772                         printk("no drives");
1773                 printk("\n");
1774                 return drives;
1775         }
1776         printk("\n");
1777         return -ENOMEM;
1778 }
1779
1780 int __init amiga_floppy_init(void)
1781 {
1782         int i;
1783
1784         if (!AMIGAHW_PRESENT(AMI_FLOPPY))
1785                 return -ENXIO;
1786
1787         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
1788                 printk("fd: Unable to get major %d for floppy\n",MAJOR_NR);
1789                 return -EBUSY;
1790         }
1791         /*
1792          *  We request DSKPTR, DSKLEN and DSKDATA only, because the other
1793          *  floppy registers are too spreaded over the custom register space
1794          */
1795         if (!request_mem_region(CUSTOM_PHYSADDR+0x20, 8, "amiflop [Paula]")) {
1796                 printk("fd: cannot get floppy registers\n");
1797                 unregister_blkdev(MAJOR_NR,"fd");
1798                 return -EBUSY;
1799         }
1800         if ((raw_buf = (char *)amiga_chip_alloc (RAW_BUF_SIZE, "Floppy")) ==
1801             NULL) {
1802                 printk("fd: cannot get chip mem buffer\n");
1803                 release_mem_region(CUSTOM_PHYSADDR+0x20, 8);
1804                 unregister_blkdev(MAJOR_NR,"fd");
1805                 return -ENOMEM;
1806         }
1807         if (request_irq(IRQ_AMIGA_DSKBLK, fd_block_done, 0, "floppy_dma", NULL)) {
1808                 printk("fd: cannot get irq for dma\n");
1809                 amiga_chip_free(raw_buf);
1810                 release_mem_region(CUSTOM_PHYSADDR+0x20, 8);
1811                 unregister_blkdev(MAJOR_NR,"fd");
1812                 return -EBUSY;
1813         }
1814         if (request_irq(IRQ_AMIGA_CIAA_TB, ms_isr, 0, "floppy_timer", NULL)) {
1815                 printk("fd: cannot get irq for timer\n");
1816                 free_irq(IRQ_AMIGA_DSKBLK, NULL);
1817                 amiga_chip_free(raw_buf);
1818                 release_mem_region(CUSTOM_PHYSADDR+0x20, 8);
1819                 unregister_blkdev(MAJOR_NR,"fd");
1820                 return -EBUSY;
1821         }
1822         if (fd_probe_drives() < 1) { /* No usable drives */
1823                 free_irq(IRQ_AMIGA_CIAA_TB, NULL);
1824                 free_irq(IRQ_AMIGA_DSKBLK, NULL);
1825                 amiga_chip_free(raw_buf);
1826                 release_mem_region(CUSTOM_PHYSADDR+0x20, 8);
1827                 unregister_blkdev(MAJOR_NR,"fd");
1828                 return -ENXIO;
1829         }
1830
1831         /* initialize variables */
1832         init_timer(&motor_on_timer);
1833         motor_on_timer.expires = 0;
1834         motor_on_timer.data = 0;
1835         motor_on_timer.function = motor_on_callback;
1836         for (i = 0; i < FD_MAX_UNITS; i++) {
1837                 init_timer(&motor_off_timer[i]);
1838                 motor_off_timer[i].expires = 0;
1839                 motor_off_timer[i].data = i|0x80000000;
1840                 motor_off_timer[i].function = fd_motor_off;
1841                 init_timer(&flush_track_timer[i]);
1842                 flush_track_timer[i].expires = 0;
1843                 flush_track_timer[i].data = i;
1844                 flush_track_timer[i].function = flush_track_callback;
1845
1846                 unit[i].track = -1;
1847         }
1848
1849         init_timer(&post_write_timer);
1850         post_write_timer.expires = 0;
1851         post_write_timer.data = 0;
1852         post_write_timer.function = post_write;
1853
1854         blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
1855         blksize_size[MAJOR_NR] = floppy_blocksizes;
1856         blk_size[MAJOR_NR] = floppy_sizes;
1857
1858         for (i = 0; i < 128; i++)
1859                 mfmdecode[i]=255;
1860         for (i = 0; i < 16; i++)
1861                 mfmdecode[mfmencode[i]]=i;
1862
1863         /* make sure that disk DMA is enabled */
1864         custom.dmacon = DMAF_SETCLR | DMAF_DISK;
1865
1866         /* init ms timer */
1867         ciaa.crb = 8; /* one-shot, stop */
1868
1869         (void)do_floppy; /* avoid warning about unused variable */
1870         return 0;
1871 }
1872
1873 #ifdef MODULE
1874 #include <linux/version.h>
1875
1876 int init_module(void)
1877 {
1878         if (!MACH_IS_AMIGA)
1879                 return -ENXIO;
1880         return amiga_floppy_init();
1881 }
1882
1883 void cleanup_module(void)
1884 {
1885         int i;
1886
1887         for( i = 0; i < FD_MAX_UNITS; i++)
1888                 if (unit[i].type->code != FD_NODRIVE)
1889                         kfree(unit[i].trackbuf);
1890         free_irq(IRQ_AMIGA_CIAA_TB, NULL);
1891         free_irq(IRQ_AMIGA_DSKBLK, NULL);
1892         custom.dmacon = DMAF_DISK; /* disable DMA */
1893         amiga_chip_free(raw_buf);
1894         blk_size[MAJOR_NR] = NULL;
1895         blksize_size[MAJOR_NR] = NULL;
1896         blk_cleanup_queue(BLK_DEFAULT_QUEUE(MAJOR_NR));
1897         release_mem_region(CUSTOM_PHYSADDR+0x20, 8);
1898         unregister_blkdev(MAJOR_NR, "fd");
1899 }
1900 #endif