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 #include <linux/slab.h>
  58
  59 #include <linux/fd.h>
  60 #include <linux/hdreg.h>
  61 #include <linux/delay.h>
  62 #include <linux/init.h>
  63 #include <linux/mutex.h>
  64 #include <linux/amifdreg.h>
  65 #include <linux/amifd.h>
  66 #include <linux/fs.h>
  67 #include <linux/blkdev.h>
  68 #include <linux/elevator.h>
  69 #include <linux/interrupt.h>
  70 #include <linux/platform_device.h>
  71
  72 #include <asm/setup.h>
  73 #include <asm/uaccess.h>
  74 #include <asm/amigahw.h>
  75 #include <asm/amigaints.h>
  76 #include <asm/irq.h>
  77
  78 #undef DEBUG /* print _LOTS_ of infos */
  79
  80 #define RAW_IOCTL
  81 #ifdef RAW_IOCTL
  82 #define IOCTL_RAW_TRACK 0x5254524B  /* 'RTRK' */
  83 #endif
  84
  85 /*
  86  *  Defines
  87  */
  88
  89 /*
  90  *  Error codes
  91  */
  92 #define FD_OK           0       /* operation succeeded */
  93 #define FD_ERROR        -1      /* general error (seek, read, write, etc) */
  94 #define FD_NOUNIT       1       /* unit does not exist */
  95 #define FD_UNITBUSY     2       /* unit already active */
  96 #define FD_NOTACTIVE    3       /* unit is not active */
  97 #define FD_NOTREADY     4       /* unit is not ready (motor not on/no disk) */
  98
  99 #define MFM_NOSYNC      1
 100 #define MFM_HEADER      2
 101 #define MFM_DATA        3
 102 #define MFM_TRACK       4
 103
 104 /*
 105  *  Floppy ID values
 106  */
 107 #define FD_NODRIVE      0x00000000  /* response when no unit is present */
 108 #define FD_DD_3         0xffffffff  /* double-density 3.5" (880K) drive */
 109 #define FD_HD_3         0x55555555  /* high-density 3.5" (1760K) drive */
 110 #define FD_DD_5         0xaaaaaaaa  /* double-density 5.25" (440K) drive */
 111
 112 static DEFINE_MUTEX(amiflop_mutex);
 113 static unsigned long int fd_def_df0 = FD_DD_3;     /* default for df0 if it doesn't identify */
 114
 115 module_param(fd_def_df0, ulong, 0);
 116 MODULE_LICENSE("GPL");
 117
 118 /*
 119  *  Macros
 120  */
 121 #define MOTOR_ON        (ciab.prb &= ~DSKMOTOR)
 122 #define MOTOR_OFF       (ciab.prb |= DSKMOTOR)
 123 #define SELECT(mask)    (ciab.prb &= ~mask)
 124 #define DESELECT(mask)  (ciab.prb |= mask)
 125 #define SELMASK(drive)  (1 << (3 + (drive & 3)))
 126
 127 static struct fd_drive_type drive_types[] = {
 128 /*  code        name       tr he   rdsz   wrsz sm pc1 pc2 sd  st st*/
 129 /*  warning: times are now in milliseconds (ms)                    */
 130 { FD_DD_3,      "DD 3.5",  80, 2, 14716, 13630, 1, 80,161, 3, 18, 1},
 131 { FD_HD_3,      "HD 3.5",  80, 2, 28344, 27258, 2, 80,161, 3, 18, 1},
 132 { FD_DD_5,      "DD 5.25", 40, 2, 14716, 13630, 1, 40, 81, 6, 30, 2},
 133 { FD_NODRIVE, "No Drive", 0, 0,     0,     0, 0,  0,  0,  0,  0, 0}
 134 };
 135 static int num_dr_types = ARRAY_SIZE(drive_types);
 136
 137 static int amiga_read(int), dos_read(int);
 138 static void amiga_write(int), dos_write(int);
 139 static struct fd_data_type data_types[] = {
 140         { "Amiga", 11 , amiga_read, amiga_write},
 141         { "MS-Dos", 9, dos_read, dos_write}
 142 };
 143
 144 /* current info on each unit */
 145 static struct amiga_floppy_struct unit[FD_MAX_UNITS];
 146
 147 static struct timer_list flush_track_timer[FD_MAX_UNITS];
 148 static struct timer_list post_write_timer;
 149 static struct timer_list motor_on_timer;
 150 static struct timer_list motor_off_timer[FD_MAX_UNITS];
 151 static int on_attempts;
 152
 153 /* Synchronization of FDC access */
 154 /* request loop (trackbuffer) */
 155 static volatile int fdc_busy = -1;
 156 static volatile int fdc_nested;
 157 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
 158
 159 static DECLARE_COMPLETION(motor_on_completion);
 160
 161 static volatile int selected = -1;      /* currently selected drive */
 162
 163 static int writepending;
 164 static int writefromint;
 165 static char *raw_buf;
 166 static int fdc_queue;
 167
 168 static DEFINE_SPINLOCK(amiflop_lock);
 169
 170 #define RAW_BUF_SIZE 30000  /* size of raw disk data */
 171
 172 /*
 173  * These are global variables, as that's the easiest way to give
 174  * information to interrupts. They are the data used for the current
 175  * request.
 176  */
 177 static volatile char block_flag;
 178 static DECLARE_WAIT_QUEUE_HEAD(wait_fd_block);
 179
 180 /* MS-Dos MFM Coding tables (should go quick and easy) */
 181 static unsigned char mfmencode[16]={
 182         0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15,
 183         0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55
 184 };
 185 static unsigned char mfmdecode[128];
 186
 187 /* floppy internal millisecond timer stuff */
 188 static DECLARE_COMPLETION(ms_wait_completion);
 189 #define MS_TICKS ((amiga_eclock+50)/1000)
 190
 191 /*
 192  * Note that MAX_ERRORS=X doesn't imply that we retry every bad read
 193  * max X times - some types of errors increase the errorcount by 2 or
 194  * even 3, so we might actually retry only X/2 times before giving up.
 195  */
 196 #define MAX_ERRORS 12
 197
 198 #define custom amiga_custom
 199
 200 /* Prevent "aliased" accesses. */
 201 static int fd_ref[4] = { 0,0,0,0 };
 202 static int fd_device[4] = { 0, 0, 0, 0 };
 203
 204 /*
 205  * Here come the actual hardware access and helper functions.
 206  * They are not reentrant and single threaded because all drives
 207  * share the same hardware and the same trackbuffer.
 208  */
 209
 210 /* Milliseconds timer */
 211
 212 static irqreturn_t ms_isr(int irq, void *dummy)
 213 {
 214         complete(&ms_wait_completion);
 215         return IRQ_HANDLED;
 216 }
 217
 218 /* all waits are queued up
 219    A more generic routine would do a schedule a la timer.device */
 220 static void ms_delay(int ms)
 221 {
 222         int ticks;
 223         static DEFINE_MUTEX(mutex);
 224
 225         if (ms > 0) {
 226                 mutex_lock(&mutex);
 227                 ticks = MS_TICKS*ms-1;
 228                 ciaa.tblo=ticks%256;
 229                 ciaa.tbhi=ticks/256;
 230                 ciaa.crb=0x19; /*count eclock, force load, one-shoot, start */
 231                 wait_for_completion(&ms_wait_completion);
 232                 mutex_unlock(&mutex);
 233         }
 234 }
 235
 236 /* Hardware semaphore */
 237
 238 /* returns true when we would get the semaphore */
 239 static inline int try_fdc(int drive)
 240 {
 241         drive &= 3;
 242         return ((fdc_busy < 0) || (fdc_busy == drive));
 243 }
 244
 245 static void get_fdc(int drive)
 246 {
 247         unsigned long flags;
 248
 249         drive &= 3;
 250 #ifdef DEBUG
 251         printk("get_fdc: drive %d  fdc_busy %d  fdc_nested %d\n",drive,fdc_busy,fdc_nested);
 252 #endif
 253         local_irq_save(flags);
 254         wait_event(fdc_wait, try_fdc(drive));
 255         fdc_busy = drive;
 256         fdc_nested++;
 257         local_irq_restore(flags);
 258 }
 259
 260 static inline void rel_fdc(void)
 261 {
 262 #ifdef DEBUG
 263         if (fdc_nested == 0)
 264                 printk("fd: unmatched rel_fdc\n");
 265         printk("rel_fdc: fdc_busy %d fdc_nested %d\n",fdc_busy,fdc_nested);
 266 #endif
 267         fdc_nested--;
 268         if (fdc_nested == 0) {
 269                 fdc_busy = -1;
 270                 wake_up(&fdc_wait);
 271         }
 272 }
 273
 274 static void fd_select (int drive)
 275 {
 276         unsigned char prb = ~0;
 277
 278         drive&=3;
 279 #ifdef DEBUG
 280         printk("selecting %d\n",drive);
 281 #endif
 282         if (drive == selected)
 283                 return;
 284         get_fdc(drive);
 285         selected = drive;
 286
 287         if (unit[drive].track % 2 != 0)
 288                 prb &= ~DSKSIDE;
 289         if (unit[drive].motor == 1)
 290                 prb &= ~DSKMOTOR;
 291         ciab.prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
 292         ciab.prb = prb;
 293         prb &= ~SELMASK(drive);
 294         ciab.prb = prb;
 295         rel_fdc();
 296 }
 297
 298 static void fd_deselect (int drive)
 299 {
 300         unsigned char prb;
 301         unsigned long flags;
 302
 303         drive&=3;
 304 #ifdef DEBUG
 305         printk("deselecting %d\n",drive);
 306 #endif
 307         if (drive != selected) {
 308                 printk(KERN_WARNING "Deselecting drive %d while %d was selected!\n",drive,selected);
 309                 return;
 310         }
 311
 312         get_fdc(drive);
 313         local_irq_save(flags);
 314
 315         selected = -1;
 316
 317         prb = ciab.prb;
 318         prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
 319         ciab.prb = prb;
 320
 321         local_irq_restore (flags);
 322         rel_fdc();
 323
 324 }
 325
 326 static void motor_on_callback(unsigned long nr)
 327 {
 328         if (!(ciaa.pra & DSKRDY) || --on_attempts == 0) {
 329                 complete_all(&motor_on_completion);
 330         } else {
 331                 motor_on_timer.expires = jiffies + HZ/10;
 332                 add_timer(&motor_on_timer);
 333         }
 334 }
 335
 336 static int fd_motor_on(int nr)
 337 {
 338         nr &= 3;
 339
 340         del_timer(motor_off_timer + nr);
 341
 342         if (!unit[nr].motor) {
 343                 unit[nr].motor = 1;
 344                 fd_select(nr);
 345
 346                 INIT_COMPLETION(motor_on_completion);
 347                 motor_on_timer.data = nr;
 348                 mod_timer(&motor_on_timer, jiffies + HZ/2);
 349
 350                 on_attempts = 10;
 351                 wait_for_completion(&motor_on_completion);
 352                 fd_deselect(nr);
 353         }
 354
 355         if (on_attempts == 0) {
 356                 on_attempts = -1;
 357 #if 0
 358                 printk (KERN_ERR "motor_on failed, turning motor off\n");
 359                 fd_motor_off (nr);
 360                 return 0;
 361 #else
 362                 printk (KERN_WARNING "DSKRDY not set after 1.5 seconds - assuming drive is spinning notwithstanding\n");
 363 #endif
 364         }
 365
 366         return 1;
 367 }
 368
 369 static void fd_motor_off(unsigned long drive)
 370 {
 371         long calledfromint;
 372 #ifdef MODULE
 373         long decusecount;
 374
 375         decusecount = drive & 0x40000000;
 376 #endif
 377         calledfromint = drive & 0x80000000;
 378         drive&=3;
 379         if (calledfromint && !try_fdc(drive)) {
 380                 /* We would be blocked in an interrupt, so try again later */
 381                 motor_off_timer[drive].expires = jiffies + 1;
 382                 add_timer(motor_off_timer + drive);
 383                 return;
 384         }
 385         unit[drive].motor = 0;
 386         fd_select(drive);
 387         udelay (1);
 388         fd_deselect(drive);
 389 }
 390
 391 static void floppy_off (unsigned int nr)
 392 {
 393         int drive;
 394
 395         drive = nr & 3;
 396         /* called this way it is always from interrupt */
 397         motor_off_timer[drive].data = nr | 0x80000000;
 398         mod_timer(motor_off_timer + drive, jiffies + 3*HZ);
 399 }
 400
 401 static int fd_calibrate(int drive)
 402 {
 403         unsigned char prb;
 404         int n;
 405
 406         drive &= 3;
 407         get_fdc(drive);
 408         if (!fd_motor_on (drive))
 409                 return 0;
 410         fd_select (drive);
 411         prb = ciab.prb;
 412         prb |= DSKSIDE;
 413         prb &= ~DSKDIREC;
 414         ciab.prb = prb;
 415         for (n = unit[drive].type->tracks/2; n != 0; --n) {
 416                 if (ciaa.pra & DSKTRACK0)
 417                         break;
 418                 prb &= ~DSKSTEP;
 419                 ciab.prb = prb;
 420                 prb |= DSKSTEP;
 421                 udelay (2);
 422                 ciab.prb = prb;
 423                 ms_delay(unit[drive].type->step_delay);
 424         }
 425         ms_delay (unit[drive].type->settle_time);
 426         prb |= DSKDIREC;
 427         n = unit[drive].type->tracks + 20;
 428         for (;;) {
 429                 prb &= ~DSKSTEP;
 430                 ciab.prb = prb;
 431                 prb |= DSKSTEP;
 432                 udelay (2);
 433                 ciab.prb = prb;
 434                 ms_delay(unit[drive].type->step_delay + 1);
 435                 if ((ciaa.pra & DSKTRACK0) == 0)
 436                         break;
 437                 if (--n == 0) {
 438                         printk (KERN_ERR "fd%d: calibrate failed, turning motor off\n", drive);
 439                         fd_motor_off (drive);
 440                         unit[drive].track = -1;
 441                         rel_fdc();
 442                         return 0;
 443                 }
 444         }
 445         unit[drive].track = 0;
 446         ms_delay(unit[drive].type->settle_time);
 447
 448         rel_fdc();
 449         fd_deselect(drive);
 450         return 1;
 451 }
 452
 453 static int fd_seek(int drive, int track)
 454 {
 455         unsigned char prb;
 456         int cnt;
 457
 458 #ifdef DEBUG
 459         printk("seeking drive %d to track %d\n",drive,track);
 460 #endif
 461         drive &= 3;
 462         get_fdc(drive);
 463         if (unit[drive].track == track) {
 464                 rel_fdc();
 465                 return 1;
 466         }
 467         if (!fd_motor_on(drive)) {
 468                 rel_fdc();
 469                 return 0;
 470         }
 471         if (unit[drive].track < 0 && !fd_calibrate(drive)) {
 472                 rel_fdc();
 473                 return 0;
 474         }
 475
 476         fd_select (drive);
 477         cnt = unit[drive].track/2 - track/2;
 478         prb = ciab.prb;
 479         prb |= DSKSIDE | DSKDIREC;
 480         if (track % 2 != 0)
 481                 prb &= ~DSKSIDE;
 482         if (cnt < 0) {
 483                 cnt = - cnt;
 484                 prb &= ~DSKDIREC;
 485         }
 486         ciab.prb = prb;
 487         if (track % 2 != unit[drive].track % 2)
 488                 ms_delay (unit[drive].type->side_time);
 489         unit[drive].track = track;
 490         if (cnt == 0) {
 491                 rel_fdc();
 492                 fd_deselect(drive);
 493                 return 1;
 494         }
 495         do {
 496                 prb &= ~DSKSTEP;
 497                 ciab.prb = prb;
 498                 prb |= DSKSTEP;
 499                 udelay (1);
 500                 ciab.prb = prb;
 501                 ms_delay (unit[drive].type->step_delay);
 502         } while (--cnt != 0);
 503         ms_delay (unit[drive].type->settle_time);
 504
 505         rel_fdc();
 506         fd_deselect(drive);
 507         return 1;
 508 }
 509
 510 static unsigned long fd_get_drive_id(int drive)
 511 {
 512         int i;
 513         ulong id = 0;
 514
 515         drive&=3;
 516         get_fdc(drive);
 517         /* set up for ID */
 518         MOTOR_ON;
 519         udelay(2);
 520         SELECT(SELMASK(drive));
 521         udelay(2);
 522         DESELECT(SELMASK(drive));
 523         udelay(2);
 524         MOTOR_OFF;
 525         udelay(2);
 526         SELECT(SELMASK(drive));
 527         udelay(2);
 528         DESELECT(SELMASK(drive));
 529         udelay(2);
 530
 531         /* loop and read disk ID */
 532         for (i=0; i<32; i++) {
 533                 SELECT(SELMASK(drive));
 534                 udelay(2);
 535
 536                 /* read and store value of DSKRDY */
 537                 id <<= 1;
 538                 id |= (ciaa.pra & DSKRDY) ? 0 : 1;      /* cia regs are low-active! */
 539
 540                 DESELECT(SELMASK(drive));
 541         }
 542
 543         rel_fdc();
 544
 545         /*
 546          * RB: At least A500/A2000's df0: don't identify themselves.
 547          * As every (real) Amiga has at least a 3.5" DD drive as df0:
 548          * we default to that if df0: doesn't identify as a certain
 549          * type.
 550          */
 551         if(drive == 0 && id == FD_NODRIVE)
 552         {
 553                 id = fd_def_df0;
 554                 printk(KERN_NOTICE "fd: drive 0 didn't identify, setting default %08lx\n", (ulong)fd_def_df0);
 555         }
 556         /* return the ID value */
 557         return (id);
 558 }
 559
 560 static irqreturn_t fd_block_done(int irq, void *dummy)
 561 {
 562         if (block_flag)
 563                 custom.dsklen = 0x4000;
 564
 565         if (block_flag == 2) { /* writing */
 566                 writepending = 2;
 567                 post_write_timer.expires = jiffies + 1; /* at least 2 ms */
 568                 post_write_timer.data = selected;
 569                 add_timer(&post_write_timer);
 570         }
 571         else {                /* reading */
 572                 block_flag = 0;
 573                 wake_up (&wait_fd_block);
 574         }
 575         return IRQ_HANDLED;
 576 }
 577
 578 static void raw_read(int drive)
 579 {
 580         drive&=3;
 581         get_fdc(drive);
 582         wait_event(wait_fd_block, !block_flag);
 583         fd_select(drive);
 584         /* setup adkcon bits correctly */
 585         custom.adkcon = ADK_MSBSYNC;
 586         custom.adkcon = ADK_SETCLR|ADK_WORDSYNC|ADK_FAST;
 587
 588         custom.dsksync = MFM_SYNC;
 589
 590         custom.dsklen = 0;
 591         custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf);
 592         custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN;
 593         custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN;
 594
 595         block_flag = 1;
 596
 597         wait_event(wait_fd_block, !block_flag);
 598
 599         custom.dsklen = 0;
 600         fd_deselect(drive);
 601         rel_fdc();
 602 }
 603
 604 static int raw_write(int drive)
 605 {
 606         ushort adk;
 607
 608         drive&=3;
 609         get_fdc(drive); /* corresponds to rel_fdc() in post_write() */
 610         if ((ciaa.pra & DSKPROT) == 0) {
 611                 rel_fdc();
 612                 return 0;
 613         }
 614         wait_event(wait_fd_block, !block_flag);
 615         fd_select(drive);
 616         /* clear adkcon bits */
 617         custom.adkcon = ADK_PRECOMP1|ADK_PRECOMP0|ADK_WORDSYNC|ADK_MSBSYNC;
 618         /* set appropriate adkcon bits */
 619         adk = ADK_SETCLR|ADK_FAST;
 620         if ((ulong)unit[drive].track >= unit[drive].type->precomp2)
 621                 adk |= ADK_PRECOMP1;
 622         else if ((ulong)unit[drive].track >= unit[drive].type->precomp1)
 623                 adk |= ADK_PRECOMP0;
 624         custom.adkcon = adk;
 625
 626         custom.dsklen = DSKLEN_WRITE;
 627         custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf);
 628         custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
 629         custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
 630
 631         block_flag = 2;
 632         return 1;
 633 }
 634
 635 /*
 636  * to be called at least 2ms after the write has finished but before any
 637  * other access to the hardware.
 638  */
 639 static void post_write (unsigned long drive)
 640 {
 641 #ifdef DEBUG
 642         printk("post_write for drive %ld\n",drive);
 643 #endif
 644         drive &= 3;
 645         custom.dsklen = 0;
 646         block_flag = 0;
 647         writepending = 0;
 648         writefromint = 0;
 649         unit[drive].dirty = 0;
 650         wake_up(&wait_fd_block);
 651         fd_deselect(drive);
 652         rel_fdc(); /* corresponds to get_fdc() in raw_write */
 653 }
 654
 655
 656 /*
 657  * The following functions are to convert the block contents into raw data
 658  * written to disk and vice versa.
 659  * (Add other formats here ;-))
 660  */
 661
 662 static unsigned long scan_sync(unsigned long raw, unsigned long end)
 663 {
 664         ushort *ptr = (ushort *)raw, *endp = (ushort *)end;
 665
 666         while (ptr < endp && *ptr++ != 0x4489)
 667                 ;
 668         if (ptr < endp) {
 669                 while (*ptr == 0x4489 && ptr < endp)
 670                         ptr++;
 671                 return (ulong)ptr;
 672         }
 673         return 0;
 674 }
 675
 676 static inline unsigned long checksum(unsigned long *addr, int len)
 677 {
 678         unsigned long csum = 0;
 679
 680         len /= sizeof(*addr);
 681         while (len-- > 0)
 682                 csum ^= *addr++;
 683         csum = ((csum>>1) & 0x55555555)  ^  (csum & 0x55555555);
 684
 685         return csum;
 686 }
 687
 688 static unsigned long decode (unsigned long *data, unsigned long *raw,
 689                              int len)
 690 {
 691         ulong *odd, *even;
 692
 693         /* convert length from bytes to longwords */
 694         len >>= 2;
 695         odd = raw;
 696         even = odd + len;
 697
 698         /* prepare return pointer */
 699         raw += len * 2;
 700
 701         do {
 702                 *data++ = ((*odd++ & 0x55555555) << 1) | (*even++ & 0x55555555);
 703         } while (--len != 0);
 704
 705         return (ulong)raw;
 706 }
 707
 708 struct header {
 709         unsigned char magic;
 710         unsigned char track;
 711         unsigned char sect;
 712         unsigned char ord;
 713         unsigned char labels[16];
 714         unsigned long hdrchk;
 715         unsigned long datachk;
 716 };
 717
 718 static int amiga_read(int drive)
 719 {
 720         unsigned long raw;
 721         unsigned long end;
 722         int scnt;
 723         unsigned long csum;
 724         struct header hdr;
 725
 726         drive&=3;
 727         raw = (long) raw_buf;
 728         end = raw + unit[drive].type->read_size;
 729
 730         for (scnt = 0;scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) {
 731                 if (!(raw = scan_sync(raw, end))) {
 732                         printk (KERN_INFO "can't find sync for sector %d\n", scnt);
 733                         return MFM_NOSYNC;
 734                 }
 735
 736                 raw = decode ((ulong *)&hdr.magic, (ulong *)raw, 4);
 737                 raw = decode ((ulong *)&hdr.labels, (ulong *)raw, 16);
 738                 raw = decode ((ulong *)&hdr.hdrchk, (ulong *)raw, 4);
 739                 raw = decode ((ulong *)&hdr.datachk, (ulong *)raw, 4);
 740                 csum = checksum((ulong *)&hdr,
 741                                 (char *)&hdr.hdrchk-(char *)&hdr);
 742
 743 #ifdef DEBUG
 744                 printk ("(%x,%d,%d,%d) (%lx,%lx,%lx,%lx) %lx %lx\n",
 745                         hdr.magic, hdr.track, hdr.sect, hdr.ord,
 746                         *(ulong *)&hdr.labels[0], *(ulong *)&hdr.labels[4],
 747                         *(ulong *)&hdr.labels[8], *(ulong *)&hdr.labels[12],
 748                         hdr.hdrchk, hdr.datachk);
 749 #endif
 750
 751                 if (hdr.hdrchk != csum) {
 752                         printk(KERN_INFO "MFM_HEADER: %08lx,%08lx\n", hdr.hdrchk, csum);
 753                         return MFM_HEADER;
 754                 }
 755
 756                 /* verify track */
 757                 if (hdr.track != unit[drive].track) {
 758                         printk(KERN_INFO "MFM_TRACK: %d, %d\n", hdr.track, unit[drive].track);
 759                         return MFM_TRACK;
 760                 }
 761
 762                 raw = decode ((ulong *)(unit[drive].trackbuf + hdr.sect*512),
 763                               (ulong *)raw, 512);
 764                 csum = checksum((ulong *)(unit[drive].trackbuf + hdr.sect*512), 512);
 765
 766                 if (hdr.datachk != csum) {
 767                         printk(KERN_INFO "MFM_DATA: (%x:%d:%d:%d) sc=%d %lx, %lx\n",
 768                                hdr.magic, hdr.track, hdr.sect, hdr.ord, scnt,
 769                                hdr.datachk, csum);
 770                         printk (KERN_INFO "data=(%lx,%lx,%lx,%lx)\n",
 771                                 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[0],
 772                                 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[1],
 773                                 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[2],
 774                                 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[3]);
 775                         return MFM_DATA;
 776                 }
 777         }
 778
 779         return 0;
 780 }
 781
 782 static void encode(unsigned long data, unsigned long *dest)
 783 {
 784         unsigned long data2;
 785
 786         data &= 0x55555555;
 787         data2 = data ^ 0x55555555;
 788         data |= ((data2 >> 1) | 0x80000000) & (data2 << 1);
 789
 790         if (*(dest - 1) & 0x00000001)
 791                 data &= 0x7FFFFFFF;
 792
 793         *dest = data;
 794 }
 795
 796 static void encode_block(unsigned long *dest, unsigned long *src, int len)
 797 {
 798         int cnt, to_cnt = 0;
 799         unsigned long data;
 800
 801         /* odd bits */
 802         for (cnt = 0; cnt < len / 4; cnt++) {
 803                 data = src[cnt] >> 1;
 804                 encode(data, dest + to_cnt++);
 805         }
 806
 807         /* even bits */
 808         for (cnt = 0; cnt < len / 4; cnt++) {
 809                 data = src[cnt];
 810                 encode(data, dest + to_cnt++);
 811         }
 812 }
 813
 814 static unsigned long *putsec(int disk, unsigned long *raw, int cnt)
 815 {
 816         struct header hdr;
 817         int i;
 818
 819         disk&=3;
 820         *raw = (raw[-1]&1) ? 0x2AAAAAAA : 0xAAAAAAAA;
 821         raw++;
 822         *raw++ = 0x44894489;
 823
 824         hdr.magic = 0xFF;
 825         hdr.track = unit[disk].track;
 826         hdr.sect = cnt;
 827         hdr.ord = unit[disk].dtype->sects * unit[disk].type->sect_mult - cnt;
 828         for (i = 0; i < 16; i++)
 829                 hdr.labels[i] = 0;
 830         hdr.hdrchk = checksum((ulong *)&hdr,
 831                               (char *)&hdr.hdrchk-(char *)&hdr);
 832         hdr.datachk = checksum((ulong *)(unit[disk].trackbuf+cnt*512), 512);
 833
 834         encode_block(raw, (ulong *)&hdr.magic, 4);
 835         raw += 2;
 836         encode_block(raw, (ulong *)&hdr.labels, 16);
 837         raw += 8;
 838         encode_block(raw, (ulong *)&hdr.hdrchk, 4);
 839         raw += 2;
 840         encode_block(raw, (ulong *)&hdr.datachk, 4);
 841         raw += 2;
 842         encode_block(raw, (ulong *)(unit[disk].trackbuf+cnt*512), 512);
 843         raw += 256;
 844
 845         return raw;
 846 }
 847
 848 static void amiga_write(int disk)
 849 {
 850         unsigned int cnt;
 851         unsigned long *ptr = (unsigned long *)raw_buf;
 852
 853         disk&=3;
 854         /* gap space */
 855         for (cnt = 0; cnt < 415 * unit[disk].type->sect_mult; cnt++)
 856                 *ptr++ = 0xaaaaaaaa;
 857
 858         /* sectors */
 859         for (cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++)
 860                 ptr = putsec (disk, ptr, cnt);
 861         *(ushort *)ptr = (ptr[-1]&1) ? 0x2AA8 : 0xAAA8;
 862 }
 863
 864
 865 struct dos_header {
 866         unsigned char track,   /* 0-80 */
 867                 side,    /* 0-1 */
 868                 sec,     /* 0-...*/
 869                 len_desc;/* 2 */
 870         unsigned short crc;     /* on 68000 we got an alignment problem,
 871                                    but this compiler solves it  by adding silently
 872                                    adding a pad byte so data won't fit
 873                                    and this took about 3h to discover.... */
 874         unsigned char gap1[22];     /* for longword-alignedness (0x4e) */
 875 };
 876
 877 /* crc routines are borrowed from the messydos-handler  */
 878
 879 /* excerpt from the messydos-device
 880 ; The CRC is computed not only over the actual data, but including
 881 ; the SYNC mark (3 * $a1) and the 'ID/DATA - Address Mark' ($fe/$fb).
 882 ; As we don't read or encode these fields into our buffers, we have to
 883 ; preload the registers containing the CRC with the values they would have
 884 ; after stepping over these fields.
 885 ;
 886 ; How CRCs "really" work:
 887 ;
 888 ; First, you should regard a bitstring as a series of coefficients of
 889 ; polynomials. We calculate with these polynomials in modulo-2
 890 ; arithmetic, in which both add and subtract are done the same as
 891 ; exclusive-or. Now, we modify our data (a very long polynomial) in
 892 ; such a way that it becomes divisible by the CCITT-standard 16-bit
 893 ;                16   12   5
 894 ; polynomial:   x  + x  + x + 1, represented by $11021. The easiest
 895 ; way to do this would be to multiply (using proper arithmetic) our
 896 ; datablock with $11021. So we have:
 897 ;   data * $11021                =
 898 ;   data * ($10000 + $1021)      =
 899 ;   data * $10000 + data * $1021
 900 ; The left part of this is simple: Just add two 0 bytes. But then
 901 ; the right part (data $1021) remains difficult and even could have
 902 ; a carry into the left part. The solution is to use a modified
 903 ; multiplication, which has a result that is not correct, but with
 904 ; a difference of any multiple of $11021. We then only need to keep
 905 ; the 16 least significant bits of the result.
 906 ;
 907 ; The following algorithm does this for us:
 908 ;
 909 ;   unsigned char *data, c, crclo, crchi;
 910 ;   while (not done) {
 911 ;       c = *data++ + crchi;
 912 ;       crchi = (@ c) >> 8 + crclo;
 913 ;       crclo = @ c;
 914 ;   }
 915 ;
 916 ; Remember, + is done with EOR, the @ operator is in two tables (high
 917 ; and low byte separately), which is calculated as
 918 ;
 919 ;      $1021 * (c & $F0)
 920 ;  xor $1021 * (c & $0F)
 921 ;  xor $1021 * (c >> 4)         (* is regular multiplication)
 922 ;
 923 ;
 924 ; Anyway, the end result is the same as the remainder of the division of
 925 ; the data by $11021. I am afraid I need to study theory a bit more...
 926
 927
 928 my only works was to code this from manx to C....
 929
 930 */
 931
 932 static ushort dos_crc(void * data_a3, int data_d0, int data_d1, int data_d3)
 933 {
 934         static unsigned char CRCTable1[] = {
 935                 0x00,0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x81,0x91,0xa1,0xb1,0xc1,0xd1,0xe1,0xf1,
 936                 0x12,0x02,0x32,0x22,0x52,0x42,0x72,0x62,0x93,0x83,0xb3,0xa3,0xd3,0xc3,0xf3,0xe3,
 937                 0x24,0x34,0x04,0x14,0x64,0x74,0x44,0x54,0xa5,0xb5,0x85,0x95,0xe5,0xf5,0xc5,0xd5,
 938                 0x36,0x26,0x16,0x06,0x76,0x66,0x56,0x46,0xb7,0xa7,0x97,0x87,0xf7,0xe7,0xd7,0xc7,
 939                 0x48,0x58,0x68,0x78,0x08,0x18,0x28,0x38,0xc9,0xd9,0xe9,0xf9,0x89,0x99,0xa9,0xb9,
 940                 0x5a,0x4a,0x7a,0x6a,0x1a,0x0a,0x3a,0x2a,0xdb,0xcb,0xfb,0xeb,0x9b,0x8b,0xbb,0xab,
 941                 0x6c,0x7c,0x4c,0x5c,0x2c,0x3c,0x0c,0x1c,0xed,0xfd,0xcd,0xdd,0xad,0xbd,0x8d,0x9d,
 942                 0x7e,0x6e,0x5e,0x4e,0x3e,0x2e,0x1e,0x0e,0xff,0xef,0xdf,0xcf,0xbf,0xaf,0x9f,0x8f,
 943                 0x91,0x81,0xb1,0xa1,0xd1,0xc1,0xf1,0xe1,0x10,0x00,0x30,0x20,0x50,0x40,0x70,0x60,
 944                 0x83,0x93,0xa3,0xb3,0xc3,0xd3,0xe3,0xf3,0x02,0x12,0x22,0x32,0x42,0x52,0x62,0x72,
 945                 0xb5,0xa5,0x95,0x85,0xf5,0xe5,0xd5,0xc5,0x34,0x24,0x14,0x04,0x74,0x64,0x54,0x44,
 946                 0xa7,0xb7,0x87,0x97,0xe7,0xf7,0xc7,0xd7,0x26,0x36,0x06,0x16,0x66,0x76,0x46,0x56,
 947                 0xd9,0xc9,0xf9,0xe9,0x99,0x89,0xb9,0xa9,0x58,0x48,0x78,0x68,0x18,0x08,0x38,0x28,
 948                 0xcb,0xdb,0xeb,0xfb,0x8b,0x9b,0xab,0xbb,0x4a,0x5a,0x6a,0x7a,0x0a,0x1a,0x2a,0x3a,
 949                 0xfd,0xed,0xdd,0xcd,0xbd,0xad,0x9d,0x8d,0x7c,0x6c,0x5c,0x4c,0x3c,0x2c,0x1c,0x0c,
 950                 0xef,0xff,0xcf,0xdf,0xaf,0xbf,0x8f,0x9f,0x6e,0x7e,0x4e,0x5e,0x2e,0x3e,0x0e,0x1e
 951         };
 952
 953         static unsigned char CRCTable2[] = {
 954                 0x00,0x21,0x42,0x63,0x84,0xa5,0xc6,0xe7,0x08,0x29,0x4a,0x6b,0x8c,0xad,0xce,0xef,
 955                 0x31,0x10,0x73,0x52,0xb5,0x94,0xf7,0xd6,0x39,0x18,0x7b,0x5a,0xbd,0x9c,0xff,0xde,
 956                 0x62,0x43,0x20,0x01,0xe6,0xc7,0xa4,0x85,0x6a,0x4b,0x28,0x09,0xee,0xcf,0xac,0x8d,
 957                 0x53,0x72,0x11,0x30,0xd7,0xf6,0x95,0xb4,0x5b,0x7a,0x19,0x38,0xdf,0xfe,0x9d,0xbc,
 958                 0xc4,0xe5,0x86,0xa7,0x40,0x61,0x02,0x23,0xcc,0xed,0x8e,0xaf,0x48,0x69,0x0a,0x2b,
 959                 0xf5,0xd4,0xb7,0x96,0x71,0x50,0x33,0x12,0xfd,0xdc,0xbf,0x9e,0x79,0x58,0x3b,0x1a,
 960                 0xa6,0x87,0xe4,0xc5,0x22,0x03,0x60,0x41,0xae,0x8f,0xec,0xcd,0x2a,0x0b,0x68,0x49,
 961                 0x97,0xb6,0xd5,0xf4,0x13,0x32,0x51,0x70,0x9f,0xbe,0xdd,0xfc,0x1b,0x3a,0x59,0x78,
 962                 0x88,0xa9,0xca,0xeb,0x0c,0x2d,0x4e,0x6f,0x80,0xa1,0xc2,0xe3,0x04,0x25,0x46,0x67,
 963                 0xb9,0x98,0xfb,0xda,0x3d,0x1c,0x7f,0x5e,0xb1,0x90,0xf3,0xd2,0x35,0x14,0x77,0x56,
 964                 0xea,0xcb,0xa8,0x89,0x6e,0x4f,0x2c,0x0d,0xe2,0xc3,0xa0,0x81,0x66,0x47,0x24,0x05,
 965                 0xdb,0xfa,0x99,0xb8,0x5f,0x7e,0x1d,0x3c,0xd3,0xf2,0x91,0xb0,0x57,0x76,0x15,0x34,
 966                 0x4c,0x6d,0x0e,0x2f,0xc8,0xe9,0x8a,0xab,0x44,0x65,0x06,0x27,0xc0,0xe1,0x82,0xa3,
 967                 0x7d,0x5c,0x3f,0x1e,0xf9,0xd8,0xbb,0x9a,0x75,0x54,0x37,0x16,0xf1,0xd0,0xb3,0x92,
 968                 0x2e,0x0f,0x6c,0x4d,0xaa,0x8b,0xe8,0xc9,0x26,0x07,0x64,0x45,0xa2,0x83,0xe0,0xc1,
 969                 0x1f,0x3e,0x5d,0x7c,0x9b,0xba,0xd9,0xf8,0x17,0x36,0x55,0x74,0x93,0xb2,0xd1,0xf0
 970         };
 971
 972 /* look at the asm-code - what looks in C a bit strange is almost as good as handmade */
 973         register int i;
 974         register unsigned char *CRCT1, *CRCT2, *data, c, crch, crcl;
 975
 976         CRCT1=CRCTable1;
 977         CRCT2=CRCTable2;
 978         data=data_a3;
 979         crcl=data_d1;
 980         crch=data_d0;
 981         for (i=data_d3; i>=0; i--) {
 982                 c = (*data++) ^ crch;
 983                 crch = CRCT1[c] ^ crcl;
 984                 crcl = CRCT2[c];
 985         }
 986         return (crch<<8)|crcl;
 987 }
 988
 989 static inline ushort dos_hdr_crc (struct dos_header *hdr)
 990 {
 991         return dos_crc(&(hdr->track), 0xb2, 0x30, 3); /* precomputed magic */
 992 }
 993
 994 static inline ushort dos_data_crc(unsigned char *data)
 995 {
 996         return dos_crc(data, 0xe2, 0x95 ,511); /* precomputed magic */
 997 }
 998
 999 static inline unsigned char dos_decode_byte(ushort word)
1000 {
1001         register ushort w2;
1002         register unsigned char byte;
1003         register unsigned char *dec = mfmdecode;
1004
1005         w2=word;
1006         w2>>=8;
1007         w2&=127;
1008         byte = dec[w2];
1009         byte <<= 4;
1010         w2 = word & 127;
1011         byte |= dec[w2];
1012         return byte;
1013 }
1014
1015 static unsigned long dos_decode(unsigned char *data, unsigned short *raw, int len)
1016 {
1017         int i;
1018
1019         for (i = 0; i < len; i++)
1020                 *data++=dos_decode_byte(*raw++);
1021         return ((ulong)raw);
1022 }
1023
1024 #ifdef DEBUG
1025 static void dbg(unsigned long ptr)
1026 {
1027         printk("raw data @%08lx: %08lx, %08lx ,%08lx, %08lx\n", ptr,
1028                ((ulong *)ptr)[0], ((ulong *)ptr)[1],
1029                ((ulong *)ptr)[2], ((ulong *)ptr)[3]);
1030 }
1031 #endif
1032
1033 static int dos_read(int drive)
1034 {
1035         unsigned long end;
1036         unsigned long raw;
1037         int scnt;
1038         unsigned short crc,data_crc[2];
1039         struct dos_header hdr;
1040
1041         drive&=3;
1042         raw = (long) raw_buf;
1043         end = raw + unit[drive].type->read_size;
1044
1045         for (scnt=0; scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) {
1046                 do { /* search for the right sync of each sec-hdr */
1047                         if (!(raw = scan_sync (raw, end))) {
1048                                 printk(KERN_INFO "dos_read: no hdr sync on "
1049                                        "track %d, unit %d for sector %d\n",
1050                                        unit[drive].track,drive,scnt);
1051                                 return MFM_NOSYNC;
1052                         }
1053 #ifdef DEBUG
1054                         dbg(raw);
1055 #endif
1056                 } while (*((ushort *)raw)!=0x5554); /* loop usually only once done */
1057                 raw+=2; /* skip over headermark */
1058                 raw = dos_decode((unsigned char *)&hdr,(ushort *) raw,8);
1059                 crc = dos_hdr_crc(&hdr);
1060
1061 #ifdef DEBUG
1062                 printk("(%3d,%d,%2d,%d) %x\n", hdr.track, hdr.side,
1063                        hdr.sec, hdr.len_desc, hdr.crc);
1064 #endif
1065
1066                 if (crc != hdr.crc) {
1067                         printk(KERN_INFO "dos_read: MFM_HEADER %04x,%04x\n",
1068                                hdr.crc, crc);
1069                         return MFM_HEADER;
1070                 }
1071                 if (hdr.track != unit[drive].track/unit[drive].type->heads) {
1072                         printk(KERN_INFO "dos_read: MFM_TRACK %d, %d\n",
1073                                hdr.track,
1074                                unit[drive].track/unit[drive].type->heads);
1075                         return MFM_TRACK;
1076                 }
1077
1078                 if (hdr.side != unit[drive].track%unit[drive].type->heads) {
1079                         printk(KERN_INFO "dos_read: MFM_SIDE %d, %d\n",
1080                                hdr.side,
1081                                unit[drive].track%unit[drive].type->heads);
1082                         return MFM_TRACK;
1083                 }
1084
1085                 if (hdr.len_desc != 2) {
1086                         printk(KERN_INFO "dos_read: unknown sector len "
1087                                "descriptor %d\n", hdr.len_desc);
1088                         return MFM_DATA;
1089                 }
1090 #ifdef DEBUG
1091                 printk("hdr accepted\n");
1092 #endif
1093                 if (!(raw = scan_sync (raw, end))) {
1094                         printk(KERN_INFO "dos_read: no data sync on track "
1095                                "%d, unit %d for sector%d, disk sector %d\n",
1096                                unit[drive].track, drive, scnt, hdr.sec);
1097                         return MFM_NOSYNC;
1098                 }
1099 #ifdef DEBUG
1100                 dbg(raw);
1101 #endif
1102
1103                 if (*((ushort *)raw)!=0x5545) {
1104                         printk(KERN_INFO "dos_read: no data mark after "
1105                                "sync (%d,%d,%d,%d) sc=%d\n",
1106                                hdr.track,hdr.side,hdr.sec,hdr.len_desc,scnt);
1107                         return MFM_NOSYNC;
1108                 }
1109
1110                 raw+=2;  /* skip data mark (included in checksum) */
1111                 raw = dos_decode((unsigned char *)(unit[drive].trackbuf + (hdr.sec - 1) * 512), (ushort *) raw, 512);
1112                 raw = dos_decode((unsigned char  *)data_crc,(ushort *) raw,4);
1113                 crc = dos_data_crc(unit[drive].trackbuf + (hdr.sec - 1) * 512);
1114
1115                 if (crc != data_crc[0]) {
1116                         printk(KERN_INFO "dos_read: MFM_DATA (%d,%d,%d,%d) "
1117                                "sc=%d, %x %x\n", hdr.track, hdr.side,
1118                                hdr.sec, hdr.len_desc, scnt,data_crc[0], crc);
1119                         printk(KERN_INFO "data=(%lx,%lx,%lx,%lx,...)\n",
1120                                ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[0],
1121                                ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[1],
1122                                ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[2],
1123                                ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[3]);
1124                         return MFM_DATA;
1125                 }
1126         }
1127         return 0;
1128 }
1129
1130 static inline ushort dos_encode_byte(unsigned char byte)
1131 {
1132         register unsigned char *enc, b2, b1;
1133         register ushort word;
1134
1135         enc=mfmencode;
1136         b1=byte;
1137         b2=b1>>4;
1138         b1&=15;
1139         word=enc[b2] <<8 | enc [b1];
1140         return (word|((word&(256|64)) ? 0: 128));
1141 }
1142
1143 static void dos_encode_block(ushort *dest, unsigned char *src, int len)
1144 {
1145         int i;
1146
1147         for (i = 0; i < len; i++) {
1148                 *dest=dos_encode_byte(*src++);
1149                 *dest|=((dest[-1]&1)||(*dest&0x4000))? 0: 0x8000;
1150                 dest++;
1151         }
1152 }
1153
1154 static unsigned long *ms_putsec(int drive, unsigned long *raw, int cnt)
1155 {
1156         static struct dos_header hdr={0,0,0,2,0,
1157           {78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78}};
1158         int i;
1159         static ushort crc[2]={0,0x4e4e};
1160
1161         drive&=3;
1162 /* id gap 1 */
1163 /* the MFM word before is always 9254 */
1164         for(i=0;i<6;i++)
1165                 *raw++=0xaaaaaaaa;
1166 /* 3 sync + 1 headermark */
1167         *raw++=0x44894489;
1168         *raw++=0x44895554;
1169
1170 /* fill in the variable parts of the header */
1171         hdr.track=unit[drive].track/unit[drive].type->heads;
1172         hdr.side=unit[drive].track%unit[drive].type->heads;
1173         hdr.sec=cnt+1;
1174         hdr.crc=dos_hdr_crc(&hdr);
1175
1176 /* header (without "magic") and id gap 2*/
1177         dos_encode_block((ushort *)raw,(unsigned char *) &hdr.track,28);
1178         raw+=14;
1179
1180 /*id gap 3 */
1181         for(i=0;i<6;i++)
1182                 *raw++=0xaaaaaaaa;
1183
1184 /* 3 syncs and 1 datamark */
1185         *raw++=0x44894489;
1186         *raw++=0x44895545;
1187
1188 /* data */
1189         dos_encode_block((ushort *)raw,
1190                          (unsigned char *)unit[drive].trackbuf+cnt*512,512);
1191         raw+=256;
1192
1193 /*data crc + jd's special gap (long words :-/) */
1194         crc[0]=dos_data_crc(unit[drive].trackbuf+cnt*512);
1195         dos_encode_block((ushort *) raw,(unsigned char *)crc,4);
1196         raw+=2;
1197
1198 /* data gap */
1199         for(i=0;i<38;i++)
1200                 *raw++=0x92549254;
1201
1202         return raw; /* wrote 652 MFM words */
1203 }
1204
1205 static void dos_write(int disk)
1206 {
1207         int cnt;
1208         unsigned long raw = (unsigned long) raw_buf;
1209         unsigned long *ptr=(unsigned long *)raw;
1210
1211         disk&=3;
1212 /* really gap4 + indexgap , but we write it first and round it up */
1213         for (cnt=0;cnt<425;cnt++)
1214                 *ptr++=0x92549254;
1215
1216 /* the following is just guessed */
1217         if (unit[disk].type->sect_mult==2)  /* check for HD-Disks */
1218                 for(cnt=0;cnt<473;cnt++)
1219                         *ptr++=0x92549254;
1220
1221 /* now the index marks...*/
1222         for (cnt=0;cnt<20;cnt++)
1223                 *ptr++=0x92549254;
1224         for (cnt=0;cnt<6;cnt++)
1225                 *ptr++=0xaaaaaaaa;
1226         *ptr++=0x52245224;
1227         *ptr++=0x52245552;
1228         for (cnt=0;cnt<20;cnt++)
1229                 *ptr++=0x92549254;
1230
1231 /* sectors */
1232         for(cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++)
1233                 ptr=ms_putsec(disk,ptr,cnt);
1234
1235         *(ushort *)ptr = 0xaaa8; /* MFM word before is always 0x9254 */
1236 }
1237
1238 /*
1239  * Here comes the high level stuff (i.e. the filesystem interface)
1240  * and helper functions.
1241  * Normally this should be the only part that has to be adapted to
1242  * different kernel versions.
1243  */
1244
1245 /* FIXME: this assumes the drive is still spinning -
1246  * which is only true if we complete writing a track within three seconds
1247  */
1248 static void flush_track_callback(unsigned long nr)
1249 {
1250         nr&=3;
1251         writefromint = 1;
1252         if (!try_fdc(nr)) {
1253                 /* we might block in an interrupt, so try again later */
1254                 flush_track_timer[nr].expires = jiffies + 1;
1255                 add_timer(flush_track_timer + nr);
1256                 return;
1257         }
1258         get_fdc(nr);
1259         (*unit[nr].dtype->write_fkt)(nr);
1260         if (!raw_write(nr)) {
1261                 printk (KERN_NOTICE "floppy disk write protected\n");
1262                 writefromint = 0;
1263                 writepending = 0;
1264         }
1265         rel_fdc();
1266 }
1267
1268 static int non_int_flush_track (unsigned long nr)
1269 {
1270         unsigned long flags;
1271
1272         nr&=3;
1273         writefromint = 0;
1274         del_timer(&post_write_timer);
1275         get_fdc(nr);
1276         if (!fd_motor_on(nr)) {
1277                 writepending = 0;
1278                 rel_fdc();
1279                 return 0;
1280         }
1281         local_irq_save(flags);
1282         if (writepending != 2) {
1283                 local_irq_restore(flags);
1284                 (*unit[nr].dtype->write_fkt)(nr);
1285                 if (!raw_write(nr)) {
1286                         printk (KERN_NOTICE "floppy disk write protected "
1287                                 "in write!\n");
1288                         writepending = 0;
1289                         return 0;
1290                 }
1291                 wait_event(wait_fd_block, block_flag != 2);
1292         }
1293         else {
1294                 local_irq_restore(flags);
1295                 ms_delay(2); /* 2 ms post_write delay */
1296                 post_write(nr);
1297         }
1298         rel_fdc();
1299         return 1;
1300 }
1301
1302 static int get_track(int drive, int track)
1303 {
1304         int error, errcnt;
1305
1306         drive&=3;
1307         if (unit[drive].track == track)
1308                 return 0;
1309         get_fdc(drive);
1310         if (!fd_motor_on(drive)) {
1311                 rel_fdc();
1312                 return -1;
1313         }
1314
1315         if (unit[drive].dirty == 1) {
1316                 del_timer (flush_track_timer + drive);
1317                 non_int_flush_track (drive);
1318         }
1319         errcnt = 0;
1320         while (errcnt < MAX_ERRORS) {
1321                 if (!fd_seek(drive, track))
1322                         return -1;
1323                 raw_read(drive);
1324                 error = (*unit[drive].dtype->read_fkt)(drive);
1325                 if (error == 0) {
1326                         rel_fdc();
1327                         return 0;
1328                 }
1329                 /* Read Error Handling: recalibrate and try again */
1330                 unit[drive].track = -1;
1331                 errcnt++;
1332         }
1333         rel_fdc();
1334         return -1;
1335 }
1336
1337 /*
1338  * Round-robin between our available drives, doing one request from each
1339  */
1340 static struct request *set_next_request(void)
1341 {
1342         struct request_queue *q;
1343         int cnt = FD_MAX_UNITS;
1344         struct request *rq = NULL;
1345
1346         /* Find next queue we can dispatch from */
1347         fdc_queue = fdc_queue + 1;
1348         if (fdc_queue == FD_MAX_UNITS)
1349                 fdc_queue = 0;
1350
1351         for(cnt = FD_MAX_UNITS; cnt > 0; cnt--) {
1352
1353                 if (unit[fdc_queue].type->code == FD_NODRIVE) {
1354                         if (++fdc_queue == FD_MAX_UNITS)
1355                                 fdc_queue = 0;
1356                         continue;
1357                 }
1358
1359                 q = unit[fdc_queue].gendisk->queue;
1360                 if (q) {
1361                         rq = blk_fetch_request(q);
1362                         if (rq)
1363                                 break;
1364                 }
1365
1366                 if (++fdc_queue == FD_MAX_UNITS)
1367                         fdc_queue = 0;
1368         }
1369
1370         return rq;
1371 }
1372
1373 static void redo_fd_request(void)
1374 {
1375         struct request *rq;
1376         unsigned int cnt, block, track, sector;
1377         int drive;
1378         struct amiga_floppy_struct *floppy;
1379         char *data;
1380         unsigned long flags;
1381         int err;
1382
1383 next_req:
1384         rq = set_next_request();
1385         if (!rq) {
1386                 /* Nothing left to do */
1387                 return;
1388         }
1389
1390         floppy = rq->rq_disk->private_data;
1391         drive = floppy - unit;
1392
1393 next_segment:
1394         /* Here someone could investigate to be more efficient */
1395         for (cnt = 0, err = 0; cnt < blk_rq_cur_sectors(rq); cnt++) {
1396 #ifdef DEBUG
1397                 printk("fd: sector %ld + %d requested for %s\n",
1398                        blk_rq_pos(rq), cnt,
1399                        (rq_data_dir(rq) == READ) ? "read" : "write");
1400 #endif
1401                 block = blk_rq_pos(rq) + cnt;
1402                 if ((int)block > floppy->blocks) {
1403                         err = -EIO;
1404                         break;
1405                 }
1406
1407                 track = block / (floppy->dtype->sects * floppy->type->sect_mult);
1408                 sector = block % (floppy->dtype->sects * floppy->type->sect_mult);
1409                 data = rq->buffer + 512 * cnt;
1410 #ifdef DEBUG
1411                 printk("access to track %d, sector %d, with buffer at "
1412                        "0x%08lx\n", track, sector, data);
1413 #endif
1414
1415                 if (get_track(drive, track) == -1) {
1416                         err = -EIO;
1417                         break;
1418                 }
1419
1420                 if (rq_data_dir(rq) == READ) {
1421                         memcpy(data, floppy->trackbuf + sector * 512, 512);
1422                 } else {
1423                         memcpy(floppy->trackbuf + sector * 512, data, 512);
1424
1425                         /* keep the drive spinning while writes are scheduled */
1426                         if (!fd_motor_on(drive)) {
1427                                 err = -EIO;
1428                                 break;
1429                         }
1430                         /*
1431                          * setup a callback to write the track buffer
1432                          * after a short (1 tick) delay.
1433                          */
1434                         local_irq_save(flags);
1435
1436                         floppy->dirty = 1;
1437                         /* reset the timer */
1438                         mod_timer (flush_track_timer + drive, jiffies + 1);
1439                         local_irq_restore(flags);
1440                 }
1441         }
1442
1443         if (__blk_end_request_cur(rq, err))
1444                 goto next_segment;
1445         goto next_req;
1446 }
1447
1448 static void do_fd_request(struct request_queue * q)
1449 {
1450         redo_fd_request();
1451 }
1452
1453 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1454 {
1455         int drive = MINOR(bdev->bd_dev) & 3;
1456
1457         geo->heads = unit[drive].type->heads;
1458         geo->sectors = unit[drive].dtype->sects * unit[drive].type->sect_mult;
1459         geo->cylinders = unit[drive].type->tracks;
1460         return 0;
1461 }
1462
1463 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode,
1464                     unsigned int cmd, unsigned long param)
1465 {
1466         struct amiga_floppy_struct *p = bdev->bd_disk->private_data;
1467         int drive = p - unit;
1468         static struct floppy_struct getprm;
1469         void __user *argp = (void __user *)param;
1470
1471         switch(cmd){
1472         case FDFMTBEG:
1473                 get_fdc(drive);
1474                 if (fd_ref[drive] > 1) {
1475                         rel_fdc();
1476                         return -EBUSY;
1477                 }
1478                 fsync_bdev(bdev);
1479                 if (fd_motor_on(drive) == 0) {
1480                         rel_fdc();
1481                         return -ENODEV;
1482                 }
1483                 if (fd_calibrate(drive) == 0) {
1484                         rel_fdc();
1485                         return -ENXIO;
1486                 }
1487                 floppy_off(drive);
1488                 rel_fdc();
1489                 break;
1490         case FDFMTTRK:
1491                 if (param < p->type->tracks * p->type->heads)
1492                 {
1493                         get_fdc(drive);
1494                         if (fd_seek(drive,param) != 0){
1495                                 memset(p->trackbuf, FD_FILL_BYTE,
1496                                        p->dtype->sects * p->type->sect_mult * 512);
1497                                 non_int_flush_track(drive);
1498                         }
1499                         floppy_off(drive);
1500                         rel_fdc();
1501                 }
1502                 else
1503                         return -EINVAL;
1504                 break;
1505         case FDFMTEND:
1506                 floppy_off(drive);
1507                 invalidate_bdev(bdev);
1508                 break;
1509         case FDGETPRM:
1510                 memset((void *)&getprm, 0, sizeof (getprm));
1511                 getprm.track=p->type->tracks;
1512                 getprm.head=p->type->heads;
1513                 getprm.sect=p->dtype->sects * p->type->sect_mult;
1514                 getprm.size=p->blocks;
1515                 if (copy_to_user(argp, &getprm, sizeof(struct floppy_struct)))
1516                         return -EFAULT;
1517                 break;
1518         case FDSETPRM:
1519         case FDDEFPRM:
1520                 return -EINVAL;
1521         case FDFLUSH: /* unconditionally, even if not needed */
1522                 del_timer (flush_track_timer + drive);
1523                 non_int_flush_track(drive);
1524                 break;
1525 #ifdef RAW_IOCTL
1526         case IOCTL_RAW_TRACK:
1527                 if (copy_to_user(argp, raw_buf, p->type->read_size))
1528                         return -EFAULT;
1529                 else
1530                         return p->type->read_size;
1531 #endif
1532         default:
1533                 printk(KERN_DEBUG "fd_ioctl: unknown cmd %d for drive %d.",
1534                        cmd, drive);
1535                 return -ENOSYS;
1536         }
1537         return 0;
1538 }
1539
1540 static int fd_ioctl(struct block_device *bdev, fmode_t mode,
1541                              unsigned int cmd, unsigned long param)
1542 {
1543         int ret;
1544
1545         mutex_lock(&amiflop_mutex);
1546         ret = fd_locked_ioctl(bdev, mode, cmd, param);
1547         mutex_unlock(&amiflop_mutex);
1548
1549         return ret;
1550 }
1551
1552 static void fd_probe(int dev)
1553 {
1554         unsigned long code;
1555         int type;
1556         int drive;
1557
1558         drive = dev & 3;
1559         code = fd_get_drive_id(drive);
1560
1561         /* get drive type */
1562         for (type = 0; type < num_dr_types; type++)
1563                 if (drive_types[type].code == code)
1564                         break;
1565
1566         if (type >= num_dr_types) {
1567                 printk(KERN_WARNING "fd_probe: unsupported drive type "
1568                        "%08lx found\n", code);
1569                 unit[drive].type = &drive_types[num_dr_types-1]; /* FD_NODRIVE */
1570                 return;
1571         }
1572
1573         unit[drive].type = drive_types + type;
1574         unit[drive].track = -1;
1575
1576         unit[drive].disk = -1;
1577         unit[drive].motor = 0;
1578         unit[drive].busy = 0;
1579         unit[drive].status = -1;
1580 }
1581
1582 /*
1583  * floppy_open check for aliasing (/dev/fd0 can be the same as
1584  * /dev/PS0 etc), and disallows simultaneous access to the same
1585  * drive with different device numbers.
1586  */
1587 static int floppy_open(struct block_device *bdev, fmode_t mode)
1588 {
1589         int drive = MINOR(bdev->bd_dev) & 3;
1590         int system =  (MINOR(bdev->bd_dev) & 4) >> 2;
1591         int old_dev;
1592         unsigned long flags;
1593
1594         mutex_lock(&amiflop_mutex);
1595         old_dev = fd_device[drive];
1596
1597         if (fd_ref[drive] && old_dev != system) {
1598                 mutex_unlock(&amiflop_mutex);
1599                 return -EBUSY;
1600         }
1601
1602         if (mode & (FMODE_READ|FMODE_WRITE)) {
1603                 check_disk_change(bdev);
1604                 if (mode & FMODE_WRITE) {
1605                         int wrprot;
1606
1607                         get_fdc(drive);
1608                         fd_select (drive);
1609                         wrprot = !(ciaa.pra & DSKPROT);
1610                         fd_deselect (drive);
1611                         rel_fdc();
1612
1613                         if (wrprot) {
1614                                 mutex_unlock(&amiflop_mutex);
1615                                 return -EROFS;
1616                         }
1617                 }
1618         }
1619
1620         local_irq_save(flags);
1621         fd_ref[drive]++;
1622         fd_device[drive] = system;
1623         local_irq_restore(flags);
1624
1625         unit[drive].dtype=&data_types[system];
1626         unit[drive].blocks=unit[drive].type->heads*unit[drive].type->tracks*
1627                 data_types[system].sects*unit[drive].type->sect_mult;
1628         set_capacity(unit[drive].gendisk, unit[drive].blocks);
1629
1630         printk(KERN_INFO "fd%d: accessing %s-disk with %s-layout\n",drive,
1631                unit[drive].type->name, data_types[system].name);
1632
1633         mutex_unlock(&amiflop_mutex);
1634         return 0;
1635 }
1636
1637 static int floppy_release(struct gendisk *disk, fmode_t mode)
1638 {
1639         struct amiga_floppy_struct *p = disk->private_data;
1640         int drive = p - unit;
1641
1642         mutex_lock(&amiflop_mutex);
1643         if (unit[drive].dirty == 1) {
1644                 del_timer (flush_track_timer + drive);
1645                 non_int_flush_track (drive);
1646         }
1647
1648         if (!fd_ref[drive]--) {
1649                 printk(KERN_CRIT "floppy_release with fd_ref == 0");
1650                 fd_ref[drive] = 0;
1651         }
1652 #ifdef MODULE
1653 /* the mod_use counter is handled this way */
1654         floppy_off (drive | 0x40000000);
1655 #endif
1656         mutex_unlock(&amiflop_mutex);
1657         return 0;
1658 }
1659
1660 /*
1661  * check_events is never called from an interrupt, so we can relax a bit
1662  * here, sleep etc. Note that floppy-on tries to set current_DOR to point
1663  * to the desired drive, but it will probably not survive the sleep if
1664  * several floppies are used at the same time: thus the loop.
1665  */
1666 static unsigned amiga_check_events(struct gendisk *disk, unsigned int clearing)
1667 {
1668         struct amiga_floppy_struct *p = disk->private_data;
1669         int drive = p - unit;
1670         int changed;
1671         static int first_time = 1;
1672
1673         if (first_time)
1674                 changed = first_time--;
1675         else {
1676                 get_fdc(drive);
1677                 fd_select (drive);
1678                 changed = !(ciaa.pra & DSKCHANGE);
1679                 fd_deselect (drive);
1680                 rel_fdc();
1681         }
1682
1683         if (changed) {
1684                 fd_probe(drive);
1685                 p->track = -1;
1686                 p->dirty = 0;
1687                 writepending = 0; /* if this was true before, too bad! */
1688                 writefromint = 0;
1689                 return DISK_EVENT_MEDIA_CHANGE;
1690         }
1691         return 0;
1692 }
1693
1694 static const struct block_device_operations floppy_fops = {
1695         .owner          = THIS_MODULE,
1696         .open           = floppy_open,
1697         .release        = floppy_release,
1698         .ioctl          = fd_ioctl,
1699         .getgeo         = fd_getgeo,
1700         .check_events   = amiga_check_events,
1701 };
1702
1703 static int __init fd_probe_drives(void)
1704 {
1705         int drive,drives,nomem;
1706
1707         printk(KERN_INFO "FD: probing units\nfound ");
1708         drives=0;
1709         nomem=0;
1710         for(drive=0;drive<FD_MAX_UNITS;drive++) {
1711                 struct gendisk *disk;
1712                 fd_probe(drive);
1713                 if (unit[drive].type->code == FD_NODRIVE)
1714                         continue;
1715                 disk = alloc_disk(1);
1716                 if (!disk) {
1717                         unit[drive].type->code = FD_NODRIVE;
1718                         continue;
1719                 }
1720                 unit[drive].gendisk = disk;
1721
1722                 disk->queue = blk_init_queue(do_fd_request, &amiflop_lock);
1723                 if (!disk->queue) {
1724                         unit[drive].type->code = FD_NODRIVE;
1725                         continue;
1726                 }
1727
1728                 drives++;
1729                 if ((unit[drive].trackbuf = kmalloc(FLOPPY_MAX_SECTORS * 512, GFP_KERNEL)) == NULL) {
1730                         printk("no mem for ");
1731                         unit[drive].type = &drive_types[num_dr_types - 1]; /* FD_NODRIVE */
1732                         drives--;
1733                         nomem = 1;
1734                 }
1735                 printk("fd%d ",drive);
1736                 disk->major = FLOPPY_MAJOR;
1737                 disk->first_minor = drive;
1738                 disk->fops = &floppy_fops;
1739                 sprintf(disk->disk_name, "fd%d", drive);
1740                 disk->private_data = &unit[drive];
1741                 set_capacity(disk, 880*2);
1742                 add_disk(disk);
1743         }
1744         if ((drives > 0) || (nomem == 0)) {
1745                 if (drives == 0)
1746                         printk("no drives");
1747                 printk("\n");
1748                 return drives;
1749         }
1750         printk("\n");
1751         return -ENOMEM;
1752 }
1753
1754 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
1755 {
1756         int drive = *part & 3;
1757         if (unit[drive].type->code == FD_NODRIVE)
1758                 return NULL;
1759         *part = 0;
1760         return get_disk(unit[drive].gendisk);
1761 }
1762
1763 static int __init amiga_floppy_probe(struct platform_device *pdev)
1764 {
1765         int i, ret;
1766
1767         if (register_blkdev(FLOPPY_MAJOR,"fd"))
1768                 return -EBUSY;
1769
1770         ret = -ENOMEM;
1771         raw_buf = amiga_chip_alloc(RAW_BUF_SIZE, "Floppy");
1772         if (!raw_buf) {
1773                 printk("fd: cannot get chip mem buffer\n");
1774                 goto out_blkdev;
1775         }
1776
1777         ret = -EBUSY;
1778         if (request_irq(IRQ_AMIGA_DSKBLK, fd_block_done, 0, "floppy_dma", NULL)) {
1779                 printk("fd: cannot get irq for dma\n");
1780                 goto out_irq;
1781         }
1782
1783         if (request_irq(IRQ_AMIGA_CIAA_TB, ms_isr, 0, "floppy_timer", NULL)) {
1784                 printk("fd: cannot get irq for timer\n");
1785                 goto out_irq2;
1786         }
1787
1788         ret = -ENODEV;
1789         if (fd_probe_drives() < 1) /* No usable drives */
1790                 goto out_probe;
1791
1792         blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
1793                                 floppy_find, NULL, NULL);
1794
1795         /* initialize variables */
1796         init_timer(&motor_on_timer);
1797         motor_on_timer.expires = 0;
1798         motor_on_timer.data = 0;
1799         motor_on_timer.function = motor_on_callback;
1800         for (i = 0; i < FD_MAX_UNITS; i++) {
1801                 init_timer(&motor_off_timer[i]);
1802                 motor_off_timer[i].expires = 0;
1803                 motor_off_timer[i].data = i|0x80000000;
1804                 motor_off_timer[i].function = fd_motor_off;
1805                 init_timer(&flush_track_timer[i]);
1806                 flush_track_timer[i].expires = 0;
1807                 flush_track_timer[i].data = i;
1808                 flush_track_timer[i].function = flush_track_callback;
1809
1810                 unit[i].track = -1;
1811         }
1812
1813         init_timer(&post_write_timer);
1814         post_write_timer.expires = 0;
1815         post_write_timer.data = 0;
1816         post_write_timer.function = post_write;
1817
1818         for (i = 0; i < 128; i++)
1819                 mfmdecode[i]=255;
1820         for (i = 0; i < 16; i++)
1821                 mfmdecode[mfmencode[i]]=i;
1822
1823         /* make sure that disk DMA is enabled */
1824         custom.dmacon = DMAF_SETCLR | DMAF_DISK;
1825
1826         /* init ms timer */
1827         ciaa.crb = 8; /* one-shot, stop */
1828         return 0;
1829
1830 out_probe:
1831         free_irq(IRQ_AMIGA_CIAA_TB, NULL);
1832 out_irq2:
1833         free_irq(IRQ_AMIGA_DSKBLK, NULL);
1834 out_irq:
1835         amiga_chip_free(raw_buf);
1836 out_blkdev:
1837         unregister_blkdev(FLOPPY_MAJOR,"fd");
1838         return ret;
1839 }
1840
1841 #if 0 /* not safe to unload */
1842 static int __exit amiga_floppy_remove(struct platform_device *pdev)
1843 {
1844         int i;
1845
1846         for( i = 0; i < FD_MAX_UNITS; i++) {
1847                 if (unit[i].type->code != FD_NODRIVE) {
1848                         struct request_queue *q = unit[i].gendisk->queue;
1849                         del_gendisk(unit[i].gendisk);
1850                         put_disk(unit[i].gendisk);
1851                         kfree(unit[i].trackbuf);
1852                         if (q)
1853                                 blk_cleanup_queue(q);
1854                 }
1855         }
1856         blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
1857         free_irq(IRQ_AMIGA_CIAA_TB, NULL);
1858         free_irq(IRQ_AMIGA_DSKBLK, NULL);
1859         custom.dmacon = DMAF_DISK; /* disable DMA */
1860         amiga_chip_free(raw_buf);
1861         unregister_blkdev(FLOPPY_MAJOR, "fd");
1862 }
1863 #endif
1864
1865 static struct platform_driver amiga_floppy_driver = {
1866         .driver   = {
1867                 .name   = "amiga-floppy",
1868                 .owner  = THIS_MODULE,
1869         },
1870 };
1871
1872 static int __init amiga_floppy_init(void)
1873 {
1874         return platform_driver_probe(&amiga_floppy_driver, amiga_floppy_probe);
1875 }
1876
1877 module_init(amiga_floppy_init);
1878
1879 #ifndef MODULE
1880 static int __init amiga_floppy_setup (char *str)
1881 {
1882         int n;
1883         if (!MACH_IS_AMIGA)
1884                 return 0;
1885         if (!get_option(&str, &n))
1886                 return 0;
1887         printk (KERN_INFO "amiflop: Setting default df0 to %x\n", n);
1888         fd_def_df0 = n;
1889         return 1;
1890 }
1891
1892 __setup("floppy=", amiga_floppy_setup);
1893 #endif
1894
1895 MODULE_ALIAS("platform:amiga-floppy");