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