linux/drivers/block/amiflop.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  linux/amiga/amiflop.c
   4 *
   5 *  Copyright (C) 1993  Greg Harp
   6 *  Portions of this driver are based on code contributed by Brad Pepers
   7 *  
   8 *  revised 28.5.95 by Joerg Dorchain
   9 *  - now no bugs(?) any more for both HD & DD
  10 *  - added support for 40 Track 5.25" drives, 80-track hopefully behaves
  11 *    like 3.5" dd (no way to test - are there any 5.25" drives out there
  12 *    that work on an A4000?)
  13 *  - wrote formatting routine (maybe dirty, but works)
  14 *
  15 *  june/july 1995 added ms-dos support by Joerg Dorchain
  16 *  (portions based on messydos.device and various contributors)
  17 *  - currently only 9 and 18 sector disks
  18 *
  19 *  - fixed a bug with the internal trackbuffer when using multiple 
  20 *    disks the same time
  21 *  - made formatting a bit safer
  22 *  - added command line and machine based default for "silent" df0
  23 *
  24 *  december 1995 adapted for 1.2.13pl4 by Joerg Dorchain
  25 *  - works but I think it's inefficient. (look in redo_fd_request)
  26 *    But the changes were very efficient. (only three and a half lines)
  27 *
  28 *  january 1996 added special ioctl for tracking down read/write problems
  29 *  - usage ioctl(d, RAW_TRACK, ptr); the raw track buffer (MFM-encoded data
  30 *    is copied to area. (area should be large enough since no checking is
  31 *    done - 30K is currently sufficient). return the actual size of the
  32 *    trackbuffer
  33 *  - replaced udelays() by a timer (CIAA timer B) for the waits 
  34 *    needed for the disk mechanic.
  35 *
  36 *  february 1996 fixed error recovery and multiple disk access
  37 *  - both got broken the first time I tampered with the driver :-(
  38 *  - still not safe, but better than before
  39 *
  40 *  revised Marts 3rd, 1996 by Jes Sorensen for use in the 1.3.28 kernel.
  41 *  - Minor changes to accept the kdev_t.
  42 *  - Replaced some more udelays with ms_delays. Udelay is just a loop,
  43 *    and so the delay will be different depending on the given
  44 *    processor :-(
  45 *  - The driver could use a major cleanup because of the new
  46 *    major/minor handling that came with kdev_t. It seems to work for
  47 *    the time being, but I can't guarantee that it will stay like
  48 *    that when we start using 16 (24?) bit minors.
  49 *
  50 * restructured jan 1997 by Joerg Dorchain
  51 * - Fixed Bug accessing multiple disks
  52 * - some code cleanup
  53 * - added trackbuffer for each drive to speed things up
  54 * - fixed some race conditions (who finds the next may send it to me ;-)
  55 */
  56
  57#include <linux/module.h>
  58#include <linux/slab.h>
  59
  60#include <linux/fd.h>
  61#include <linux/hdreg.h>
  62#include <linux/delay.h>
  63#include <linux/init.h>
  64#include <linux/mutex.h>
  65#include <linux/fs.h>
  66#include <linux/blk-mq.h>
  67#include <linux/elevator.h>
  68#include <linux/interrupt.h>
  69#include <linux/platform_device.h>
  70
  71#include <asm/setup.h>
  72#include <linux/uaccess.h>
  73#include <asm/amigahw.h>
  74#include <asm/amigaints.h>
  75#include <asm/irq.h>
  76
  77#undef DEBUG /* print _LOTS_ of infos */
  78
  79#define RAW_IOCTL
  80#ifdef RAW_IOCTL
  81#define IOCTL_RAW_TRACK 0x5254524B  /* 'RTRK' */
  82#endif
  83
  84/*
  85 *  Defines
  86 */
  87
  88/*
  89 * CIAAPRA bits (read only)
  90 */
  91
  92#define DSKRDY      (0x1<<5)        /* disk ready when low */
  93#define DSKTRACK0   (0x1<<4)        /* head at track zero when low */
  94#define DSKPROT     (0x1<<3)        /* disk protected when low */
  95#define DSKCHANGE   (0x1<<2)        /* low when disk removed */
  96
  97/*
  98 * CIAAPRB bits (read/write)
  99 */
 100
 101#define DSKMOTOR    (0x1<<7)        /* motor on when low */
 102#define DSKSEL3     (0x1<<6)        /* select drive 3 when low */
 103#define DSKSEL2     (0x1<<5)        /* select drive 2 when low */
 104#define DSKSEL1     (0x1<<4)        /* select drive 1 when low */
 105#define DSKSEL0     (0x1<<3)        /* select drive 0 when low */
 106#define DSKSIDE     (0x1<<2)        /* side selection: 0 = upper, 1 = lower */
 107#define DSKDIREC    (0x1<<1)        /* step direction: 0=in, 1=out (to trk 0) */
 108#define DSKSTEP     (0x1)           /* pulse low to step head 1 track */
 109
 110/*
 111 * DSKBYTR bits (read only)
 112 */
 113
 114#define DSKBYT      (1<<15)         /* register contains valid byte when set */
 115#define DMAON       (1<<14)         /* disk DMA enabled */
 116#define DISKWRITE   (1<<13)         /* disk write bit in DSKLEN enabled */
 117#define WORDEQUAL   (1<<12)         /* DSKSYNC register match when true */
 118/* bits 7-0 are data */
 119
 120/*
 121 * ADKCON/ADKCONR bits
 122 */
 123
 124#ifndef SETCLR
 125#define ADK_SETCLR      (1<<15)     /* control bit */
 126#endif
 127#define ADK_PRECOMP1    (1<<14)     /* precompensation selection */
 128#define ADK_PRECOMP0    (1<<13)     /* 00=none, 01=140ns, 10=280ns, 11=500ns */
 129#define ADK_MFMPREC     (1<<12)     /* 0=GCR precomp., 1=MFM precomp. */
 130#define ADK_WORDSYNC    (1<<10)     /* enable DSKSYNC auto DMA */
 131#define ADK_MSBSYNC     (1<<9)      /* when 1, enable sync on MSbit (for GCR) */
 132#define ADK_FAST        (1<<8)      /* bit cell: 0=2us (GCR), 1=1us (MFM) */
 133
 134/*
 135 * DSKLEN bits
 136 */
 137
 138#define DSKLEN_DMAEN    (1<<15)
 139#define DSKLEN_WRITE    (1<<14)
 140
 141/*
 142 * INTENA/INTREQ bits
 143 */
 144
 145#define DSKINDEX    (0x1<<4)        /* DSKINDEX bit */
 146
 147/*
 148 * Misc
 149 */
 150
 151#define MFM_SYNC    0x4489          /* standard MFM sync value */
 152
 153/* Values for FD_COMMAND */
 154#define FD_RECALIBRATE          0x07    /* move to track 0 */
 155#define FD_SEEK                 0x0F    /* seek track */
 156#define FD_READ                 0xE6    /* read with MT, MFM, SKip deleted */
 157#define FD_WRITE                0xC5    /* write with MT, MFM */
 158#define FD_SENSEI               0x08    /* Sense Interrupt Status */
 159#define FD_SPECIFY              0x03    /* specify HUT etc */
 160#define FD_FORMAT               0x4D    /* format one track */
 161#define FD_VERSION              0x10    /* get version code */
 162#define FD_CONFIGURE            0x13    /* configure FIFO operation */
 163#define FD_PERPENDICULAR        0x12    /* perpendicular r/w mode */
 164
 165#define FD_MAX_UNITS    4       /* Max. Number of drives */
 166#define FLOPPY_MAX_SECTORS      22      /* Max. Number of sectors per track */
 167
 168struct fd_data_type {
 169        char *name;             /* description of data type */
 170        int sects;              /* sectors per track */
 171        int (*read_fkt)(int);   /* read whole track */
 172        void (*write_fkt)(int); /* write whole track */
 173};
 174
 175struct fd_drive_type {
 176        unsigned long code;             /* code returned from drive */
 177        char *name;                     /* description of drive */
 178        unsigned int tracks;    /* number of tracks */
 179        unsigned int heads;             /* number of heads */
 180        unsigned int read_size; /* raw read size for one track */
 181        unsigned int write_size;        /* raw write size for one track */
 182        unsigned int sect_mult; /* sectors and gap multiplier (HD = 2) */
 183        unsigned int precomp1;  /* start track for precomp 1 */
 184        unsigned int precomp2;  /* start track for precomp 2 */
 185        unsigned int step_delay;        /* time (in ms) for delay after step */
 186        unsigned int settle_time;       /* time to settle after dir change */
 187        unsigned int side_time; /* time needed to change sides */
 188};
 189
 190struct amiga_floppy_struct {
 191        struct fd_drive_type *type;     /* type of floppy for this unit */
 192        struct fd_data_type *dtype;     /* type of floppy for this unit */
 193        int track;                      /* current track (-1 == unknown) */
 194        unsigned char *trackbuf;        /* current track (kmaloc()'d */
 195
 196        int blocks;                     /* total # blocks on disk */
 197
 198        int changed;                    /* true when not known */
 199        int disk;                       /* disk in drive (-1 == unknown) */
 200        int motor;                      /* true when motor is at speed */
 201        int busy;                       /* true when drive is active */
 202        int dirty;                      /* true when trackbuf is not on disk */
 203        int status;                     /* current error code for unit */
 204        struct gendisk *gendisk[2];
 205        struct blk_mq_tag_set tag_set;
 206};
 207
 208/*
 209 *  Error codes
 210 */
 211#define FD_OK           0       /* operation succeeded */
 212#define FD_ERROR        -1      /* general error (seek, read, write, etc) */
 213#define FD_NOUNIT       1       /* unit does not exist */
 214#define FD_UNITBUSY     2       /* unit already active */
 215#define FD_NOTACTIVE    3       /* unit is not active */
 216#define FD_NOTREADY     4       /* unit is not ready (motor not on/no disk) */
 217
 218#define MFM_NOSYNC      1
 219#define MFM_HEADER      2
 220#define MFM_DATA        3
 221#define MFM_TRACK       4
 222
 223/*
 224 *  Floppy ID values
 225 */
 226#define FD_NODRIVE      0x00000000  /* response when no unit is present */
 227#define FD_DD_3         0xffffffff  /* double-density 3.5" (880K) drive */
 228#define FD_HD_3         0x55555555  /* high-density 3.5" (1760K) drive */
 229#define FD_DD_5         0xaaaaaaaa  /* double-density 5.25" (440K) drive */
 230
 231static DEFINE_MUTEX(amiflop_mutex);
 232static unsigned long int fd_def_df0 = FD_DD_3;     /* default for df0 if it doesn't identify */
 233
 234module_param(fd_def_df0, ulong, 0);
 235MODULE_LICENSE("GPL");
 236
 237/*
 238 *  Macros
 239 */
 240#define MOTOR_ON        (ciab.prb &= ~DSKMOTOR)
 241#define MOTOR_OFF       (ciab.prb |= DSKMOTOR)
 242#define SELECT(mask)    (ciab.prb &= ~mask)
 243#define DESELECT(mask)  (ciab.prb |= mask)
 244#define SELMASK(drive)  (1 << (3 + (drive & 3)))
 245
 246static struct fd_drive_type drive_types[] = {
 247/*  code        name       tr he   rdsz   wrsz sm pc1 pc2 sd  st st*/
 248/*  warning: times are now in milliseconds (ms)                    */
 249{ FD_DD_3,      "DD 3.5",  80, 2, 14716, 13630, 1, 80,161, 3, 18, 1},
 250{ FD_HD_3,      "HD 3.5",  80, 2, 28344, 27258, 2, 80,161, 3, 18, 1},
 251{ FD_DD_5,      "DD 5.25", 40, 2, 14716, 13630, 1, 40, 81, 6, 30, 2},
 252{ FD_NODRIVE, "No Drive", 0, 0,     0,     0, 0,  0,  0,  0,  0, 0}
 253};
 254static int num_dr_types = ARRAY_SIZE(drive_types);
 255
 256static int amiga_read(int), dos_read(int);
 257static void amiga_write(int), dos_write(int);
 258static struct fd_data_type data_types[] = {
 259        { "Amiga", 11 , amiga_read, amiga_write},
 260        { "MS-Dos", 9, dos_read, dos_write}
 261};
 262
 263/* current info on each unit */
 264static struct amiga_floppy_struct unit[FD_MAX_UNITS];
 265
 266static struct timer_list flush_track_timer[FD_MAX_UNITS];
 267static struct timer_list post_write_timer;
 268static unsigned long post_write_timer_drive;
 269static struct timer_list motor_on_timer;
 270static struct timer_list motor_off_timer[FD_MAX_UNITS];
 271static int on_attempts;
 272
 273/* Synchronization of FDC access */
 274/* request loop (trackbuffer) */
 275static volatile int fdc_busy = -1;
 276static volatile int fdc_nested;
 277static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
 278 
 279static DECLARE_COMPLETION(motor_on_completion);
 280
 281static volatile int selected = -1;      /* currently selected drive */
 282
 283static int writepending;
 284static int writefromint;
 285static char *raw_buf;
 286
 287static DEFINE_SPINLOCK(amiflop_lock);
 288
 289#define RAW_BUF_SIZE 30000  /* size of raw disk data */
 290
 291/*
 292 * These are global variables, as that's the easiest way to give
 293 * information to interrupts. They are the data used for the current
 294 * request.
 295 */
 296static volatile char block_flag;
 297static DECLARE_WAIT_QUEUE_HEAD(wait_fd_block);
 298
 299/* MS-Dos MFM Coding tables (should go quick and easy) */
 300static unsigned char mfmencode[16]={
 301        0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15,
 302        0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55
 303};
 304static unsigned char mfmdecode[128];
 305
 306/* floppy internal millisecond timer stuff */
 307static DECLARE_COMPLETION(ms_wait_completion);
 308#define MS_TICKS ((amiga_eclock+50)/1000)
 309
 310/*
 311 * Note that MAX_ERRORS=X doesn't imply that we retry every bad read
 312 * max X times - some types of errors increase the errorcount by 2 or
 313 * even 3, so we might actually retry only X/2 times before giving up.
 314 */
 315#define MAX_ERRORS 12
 316
 317#define custom amiga_custom
 318
 319/* Prevent "aliased" accesses. */
 320static int fd_ref[4] = { 0,0,0,0 };
 321static int fd_device[4] = { 0, 0, 0, 0 };
 322
 323/*
 324 * Here come the actual hardware access and helper functions.
 325 * They are not reentrant and single threaded because all drives
 326 * share the same hardware and the same trackbuffer.
 327 */
 328
 329/* Milliseconds timer */
 330
 331static irqreturn_t ms_isr(int irq, void *dummy)
 332{
 333        complete(&ms_wait_completion);
 334        return IRQ_HANDLED;
 335}
 336
 337/* all waits are queued up 
 338   A more generic routine would do a schedule a la timer.device */
 339static void ms_delay(int ms)
 340{
 341        int ticks;
 342        static DEFINE_MUTEX(mutex);
 343
 344        if (ms > 0) {
 345                mutex_lock(&mutex);
 346                ticks = MS_TICKS*ms-1;
 347                ciaa.tblo=ticks%256;
 348                ciaa.tbhi=ticks/256;
 349                ciaa.crb=0x19; /*count eclock, force load, one-shoot, start */
 350                wait_for_completion(&ms_wait_completion);
 351                mutex_unlock(&mutex);
 352        }
 353}
 354
 355/* Hardware semaphore */
 356
 357/* returns true when we would get the semaphore */
 358static inline int try_fdc(int drive)
 359{
 360        drive &= 3;
 361        return ((fdc_busy < 0) || (fdc_busy == drive));
 362}
 363
 364static void get_fdc(int drive)
 365{
 366        unsigned long flags;
 367
 368        drive &= 3;
 369#ifdef DEBUG
 370        printk("get_fdc: drive %d  fdc_busy %d  fdc_nested %d\n",drive,fdc_busy,fdc_nested);
 371#endif
 372        local_irq_save(flags);
 373        wait_event(fdc_wait, try_fdc(drive));
 374        fdc_busy = drive;
 375        fdc_nested++;
 376        local_irq_restore(flags);
 377}
 378
 379static inline void rel_fdc(void)
 380{
 381#ifdef DEBUG
 382        if (fdc_nested == 0)
 383                printk("fd: unmatched rel_fdc\n");
 384        printk("rel_fdc: fdc_busy %d fdc_nested %d\n",fdc_busy,fdc_nested);
 385#endif
 386        fdc_nested--;
 387        if (fdc_nested == 0) {
 388                fdc_busy = -1;
 389                wake_up(&fdc_wait);
 390        }
 391}
 392
 393static void fd_select (int drive)
 394{
 395        unsigned char prb = ~0;
 396
 397        drive&=3;
 398#ifdef DEBUG
 399        printk("selecting %d\n",drive);
 400#endif
 401        if (drive == selected)
 402                return;
 403        get_fdc(drive);
 404        selected = drive;
 405
 406        if (unit[drive].track % 2 != 0)
 407                prb &= ~DSKSIDE;
 408        if (unit[drive].motor == 1)
 409                prb &= ~DSKMOTOR;
 410        ciab.prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
 411        ciab.prb = prb;
 412        prb &= ~SELMASK(drive);
 413        ciab.prb = prb;
 414        rel_fdc();
 415}
 416
 417static void fd_deselect (int drive)
 418{
 419        unsigned char prb;
 420        unsigned long flags;
 421
 422        drive&=3;
 423#ifdef DEBUG
 424        printk("deselecting %d\n",drive);
 425#endif
 426        if (drive != selected) {
 427                printk(KERN_WARNING "Deselecting drive %d while %d was selected!\n",drive,selected);
 428                return;
 429        }
 430
 431        get_fdc(drive);
 432        local_irq_save(flags);
 433
 434        selected = -1;
 435
 436        prb = ciab.prb;
 437        prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
 438        ciab.prb = prb;
 439
 440        local_irq_restore (flags);
 441        rel_fdc();
 442
 443}
 444
 445static void motor_on_callback(struct timer_list *unused)
 446{
 447        if (!(ciaa.pra & DSKRDY) || --on_attempts == 0) {
 448                complete_all(&motor_on_completion);
 449        } else {
 450                motor_on_timer.expires = jiffies + HZ/10;
 451                add_timer(&motor_on_timer);
 452        }
 453}
 454
 455static int fd_motor_on(int nr)
 456{
 457        nr &= 3;
 458
 459        del_timer(motor_off_timer + nr);
 460
 461        if (!unit[nr].motor) {
 462                unit[nr].motor = 1;
 463                fd_select(nr);
 464
 465                reinit_completion(&motor_on_completion);
 466                mod_timer(&motor_on_timer, jiffies + HZ/2);
 467
 468                on_attempts = 10;
 469                wait_for_completion(&motor_on_completion);
 470                fd_deselect(nr);
 471        }
 472
 473        if (on_attempts == 0) {
 474                on_attempts = -1;
 475#if 0
 476                printk (KERN_ERR "motor_on failed, turning motor off\n");
 477                fd_motor_off (motor_off_timer + nr);
 478                return 0;
 479#else
 480                printk (KERN_WARNING "DSKRDY not set after 1.5 seconds - assuming drive is spinning notwithstanding\n");
 481#endif
 482        }
 483
 484        return 1;
 485}
 486
 487static void fd_motor_off(struct timer_list *timer)
 488{
 489        unsigned long drive = ((unsigned long)timer -
 490                               (unsigned long)&motor_off_timer[0]) /
 491                                        sizeof(motor_off_timer[0]);
 492
 493        drive&=3;
 494        if (!try_fdc(drive)) {
 495                /* We would be blocked in an interrupt, so try again later */
 496                timer->expires = jiffies + 1;
 497                add_timer(timer);
 498                return;
 499        }
 500        unit[drive].motor = 0;
 501        fd_select(drive);
 502        udelay (1);
 503        fd_deselect(drive);
 504}
 505
 506static void floppy_off (unsigned int nr)
 507{
 508        int drive;
 509
 510        drive = nr & 3;
 511        mod_timer(motor_off_timer + drive, jiffies + 3*HZ);
 512}
 513
 514static int fd_calibrate(int drive)
 515{
 516        unsigned char prb;
 517        int n;
 518
 519        drive &= 3;
 520        get_fdc(drive);
 521        if (!fd_motor_on (drive))
 522                return 0;
 523        fd_select (drive);
 524        prb = ciab.prb;
 525        prb |= DSKSIDE;
 526        prb &= ~DSKDIREC;
 527        ciab.prb = prb;
 528        for (n = unit[drive].type->tracks/2; n != 0; --n) {
 529                if (ciaa.pra & DSKTRACK0)
 530                        break;
 531                prb &= ~DSKSTEP;
 532                ciab.prb = prb;
 533                prb |= DSKSTEP;
 534                udelay (2);
 535                ciab.prb = prb;
 536                ms_delay(unit[drive].type->step_delay);
 537        }
 538        ms_delay (unit[drive].type->settle_time);
 539        prb |= DSKDIREC;
 540        n = unit[drive].type->tracks + 20;
 541        for (;;) {
 542                prb &= ~DSKSTEP;
 543                ciab.prb = prb;
 544                prb |= DSKSTEP;
 545                udelay (2);
 546                ciab.prb = prb;
 547                ms_delay(unit[drive].type->step_delay + 1);
 548                if ((ciaa.pra & DSKTRACK0) == 0)
 549                        break;
 550                if (--n == 0) {
 551                        printk (KERN_ERR "fd%d: calibrate failed, turning motor off\n", drive);
 552                        fd_motor_off (motor_off_timer + drive);
 553                        unit[drive].track = -1;
 554                        rel_fdc();
 555                        return 0;
 556                }
 557        }
 558        unit[drive].track = 0;
 559        ms_delay(unit[drive].type->settle_time);
 560
 561        rel_fdc();
 562        fd_deselect(drive);
 563        return 1;
 564}
 565
 566static int fd_seek(int drive, int track)
 567{
 568        unsigned char prb;
 569        int cnt;
 570
 571#ifdef DEBUG
 572        printk("seeking drive %d to track %d\n",drive,track);
 573#endif
 574        drive &= 3;
 575        get_fdc(drive);
 576        if (unit[drive].track == track) {
 577                rel_fdc();
 578                return 1;
 579        }
 580        if (!fd_motor_on(drive)) {
 581                rel_fdc();
 582                return 0;
 583        }
 584        if (unit[drive].track < 0 && !fd_calibrate(drive)) {
 585                rel_fdc();
 586                return 0;
 587        }
 588
 589        fd_select (drive);
 590        cnt = unit[drive].track/2 - track/2;
 591        prb = ciab.prb;
 592        prb |= DSKSIDE | DSKDIREC;
 593        if (track % 2 != 0)
 594                prb &= ~DSKSIDE;
 595        if (cnt < 0) {
 596                cnt = - cnt;
 597                prb &= ~DSKDIREC;
 598        }
 599        ciab.prb = prb;
 600        if (track % 2 != unit[drive].track % 2)
 601                ms_delay (unit[drive].type->side_time);
 602        unit[drive].track = track;
 603        if (cnt == 0) {
 604                rel_fdc();
 605                fd_deselect(drive);
 606                return 1;
 607        }
 608        do {
 609                prb &= ~DSKSTEP;
 610                ciab.prb = prb;
 611                prb |= DSKSTEP;
 612                udelay (1);
 613                ciab.prb = prb;
 614                ms_delay (unit[drive].type->step_delay);
 615        } while (--cnt != 0);
 616        ms_delay (unit[drive].type->settle_time);
 617
 618        rel_fdc();
 619        fd_deselect(drive);
 620        return 1;
 621}
 622
 623static unsigned long fd_get_drive_id(int drive)
 624{
 625        int i;
 626        ulong id = 0;
 627
 628        drive&=3;
 629        get_fdc(drive);
 630        /* set up for ID */
 631        MOTOR_ON;
 632        udelay(2);
 633        SELECT(SELMASK(drive));
 634        udelay(2);
 635        DESELECT(SELMASK(drive));
 636        udelay(2);
 637        MOTOR_OFF;
 638        udelay(2);
 639        SELECT(SELMASK(drive));
 640        udelay(2);
 641        DESELECT(SELMASK(drive));
 642        udelay(2);
 643
 644        /* loop and read disk ID */
 645        for (i=0; i<32; i++) {
 646                SELECT(SELMASK(drive));
 647                udelay(2);
 648
 649                /* read and store value of DSKRDY */
 650                id <<= 1;
 651                id |= (ciaa.pra & DSKRDY) ? 0 : 1;      /* cia regs are low-active! */
 652
 653                DESELECT(SELMASK(drive));
 654        }
 655
 656        rel_fdc();
 657
 658        /*
 659         * RB: At least A500/A2000's df0: don't identify themselves.
 660         * As every (real) Amiga has at least a 3.5" DD drive as df0:
 661         * we default to that if df0: doesn't identify as a certain
 662         * type.
 663         */
 664        if(drive == 0 && id == FD_NODRIVE)
 665        {
 666                id = fd_def_df0;
 667                printk(KERN_NOTICE "fd: drive 0 didn't identify, setting default %08lx\n", (ulong)fd_def_df0);
 668        }
 669        /* return the ID value */
 670        return (id);
 671}
 672
 673static irqreturn_t fd_block_done(int irq, void *dummy)
 674{
 675        if (block_flag)
 676                custom.dsklen = 0x4000;
 677
 678        if (block_flag == 2) { /* writing */
 679                writepending = 2;
 680                post_write_timer.expires = jiffies + 1; /* at least 2 ms */
 681                post_write_timer_drive = selected;
 682                add_timer(&post_write_timer);
 683        }
 684        else {                /* reading */
 685                block_flag = 0;
 686                wake_up (&wait_fd_block);
 687        }
 688        return IRQ_HANDLED;
 689}
 690
 691static void raw_read(int drive)
 692{
 693        drive&=3;
 694        get_fdc(drive);
 695        wait_event(wait_fd_block, !block_flag);
 696        fd_select(drive);
 697        /* setup adkcon bits correctly */
 698        custom.adkcon = ADK_MSBSYNC;
 699        custom.adkcon = ADK_SETCLR|ADK_WORDSYNC|ADK_FAST;
 700
 701        custom.dsksync = MFM_SYNC;
 702
 703        custom.dsklen = 0;
 704        custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf);
 705        custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN;
 706        custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN;
 707
 708        block_flag = 1;
 709
 710        wait_event(wait_fd_block, !block_flag);
 711
 712        custom.dsklen = 0;
 713        fd_deselect(drive);
 714        rel_fdc();
 715}
 716
 717static int raw_write(int drive)
 718{
 719        ushort adk;
 720
 721        drive&=3;
 722        get_fdc(drive); /* corresponds to rel_fdc() in post_write() */
 723        if ((ciaa.pra & DSKPROT) == 0) {
 724                rel_fdc();
 725                return 0;
 726        }
 727        wait_event(wait_fd_block, !block_flag);
 728        fd_select(drive);
 729        /* clear adkcon bits */
 730        custom.adkcon = ADK_PRECOMP1|ADK_PRECOMP0|ADK_WORDSYNC|ADK_MSBSYNC;
 731        /* set appropriate adkcon bits */
 732        adk = ADK_SETCLR|ADK_FAST;
 733        if ((ulong)unit[drive].track >= unit[drive].type->precomp2)
 734                adk |= ADK_PRECOMP1;
 735        else if ((ulong)unit[drive].track >= unit[drive].type->precomp1)
 736                adk |= ADK_PRECOMP0;
 737        custom.adkcon = adk;
 738
 739        custom.dsklen = DSKLEN_WRITE;
 740        custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf);
 741        custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
 742        custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
 743
 744        block_flag = 2;
 745        return 1;
 746}
 747
 748/*
 749 * to be called at least 2ms after the write has finished but before any
 750 * other access to the hardware.
 751 */
 752static void post_write (unsigned long drive)
 753{
 754#ifdef DEBUG
 755        printk("post_write for drive %ld\n",drive);
 756#endif
 757        drive &= 3;
 758        custom.dsklen = 0;
 759        block_flag = 0;
 760        writepending = 0;
 761        writefromint = 0;
 762        unit[drive].dirty = 0;
 763        wake_up(&wait_fd_block);
 764        fd_deselect(drive);
 765        rel_fdc(); /* corresponds to get_fdc() in raw_write */
 766}
 767
 768static void post_write_callback(struct timer_list *timer)
 769{
 770        post_write(post_write_timer_drive);
 771}
 772
 773/*
 774 * The following functions are to convert the block contents into raw data
 775 * written to disk and vice versa.
 776 * (Add other formats here ;-))
 777 */
 778
 779static unsigned long scan_sync(unsigned long raw, unsigned long end)
 780{
 781        ushort *ptr = (ushort *)raw, *endp = (ushort *)end;
 782
 783        while (ptr < endp && *ptr++ != 0x4489)
 784                ;
 785        if (ptr < endp) {
 786                while (*ptr == 0x4489 && ptr < endp)
 787                        ptr++;
 788                return (ulong)ptr;
 789        }
 790        return 0;
 791}
 792
 793static inline unsigned long checksum(unsigned long *addr, int len)
 794{
 795        unsigned long csum = 0;
 796
 797        len /= sizeof(*addr);
 798        while (len-- > 0)
 799                csum ^= *addr++;
 800        csum = ((csum>>1) & 0x55555555)  ^  (csum & 0x55555555);
 801
 802        return csum;
 803}
 804
 805static unsigned long decode (unsigned long *data, unsigned long *raw,
 806                             int len)
 807{
 808        ulong *odd, *even;
 809
 810        /* convert length from bytes to longwords */
 811        len >>= 2;
 812        odd = raw;
 813        even = odd + len;
 814
 815        /* prepare return pointer */
 816        raw += len * 2;
 817
 818        do {
 819                *data++ = ((*odd++ & 0x55555555) << 1) | (*even++ & 0x55555555);
 820        } while (--len != 0);
 821
 822        return (ulong)raw;
 823}
 824
 825struct header {
 826        unsigned char magic;
 827        unsigned char track;
 828        unsigned char sect;
 829        unsigned char ord;
 830        unsigned char labels[16];
 831        unsigned long hdrchk;
 832        unsigned long datachk;
 833};
 834
 835static int amiga_read(int drive)
 836{
 837        unsigned long raw;
 838        unsigned long end;
 839        int scnt;
 840        unsigned long csum;
 841        struct header hdr;
 842
 843        drive&=3;
 844        raw = (long) raw_buf;
 845        end = raw + unit[drive].type->read_size;
 846
 847        for (scnt = 0;scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) {
 848                if (!(raw = scan_sync(raw, end))) {
 849                        printk (KERN_INFO "can't find sync for sector %d\n", scnt);
 850                        return MFM_NOSYNC;
 851                }
 852
 853                raw = decode ((ulong *)&hdr.magic, (ulong *)raw, 4);
 854                raw = decode ((ulong *)&hdr.labels, (ulong *)raw, 16);
 855                raw = decode ((ulong *)&hdr.hdrchk, (ulong *)raw, 4);
 856                raw = decode ((ulong *)&hdr.datachk, (ulong *)raw, 4);
 857                csum = checksum((ulong *)&hdr,
 858                                (char *)&hdr.hdrchk-(char *)&hdr);
 859
 860#ifdef DEBUG
 861                printk ("(%x,%d,%d,%d) (%lx,%lx,%lx,%lx) %lx %lx\n",
 862                        hdr.magic, hdr.track, hdr.sect, hdr.ord,
 863                        *(ulong *)&hdr.labels[0], *(ulong *)&hdr.labels[4],
 864                        *(ulong *)&hdr.labels[8], *(ulong *)&hdr.labels[12],
 865                        hdr.hdrchk, hdr.datachk);
 866#endif
 867
 868                if (hdr.hdrchk != csum) {
 869                        printk(KERN_INFO "MFM_HEADER: %08lx,%08lx\n", hdr.hdrchk, csum);
 870                        return MFM_HEADER;
 871                }
 872
 873                /* verify track */
 874                if (hdr.track != unit[drive].track) {
 875                        printk(KERN_INFO "MFM_TRACK: %d, %d\n", hdr.track, unit[drive].track);
 876                        return MFM_TRACK;
 877                }
 878
 879                raw = decode ((ulong *)(unit[drive].trackbuf + hdr.sect*512),
 880                              (ulong *)raw, 512);
 881                csum = checksum((ulong *)(unit[drive].trackbuf + hdr.sect*512), 512);
 882
 883                if (hdr.datachk != csum) {
 884                        printk(KERN_INFO "MFM_DATA: (%x:%d:%d:%d) sc=%d %lx, %lx\n",
 885                               hdr.magic, hdr.track, hdr.sect, hdr.ord, scnt,
 886                               hdr.datachk, csum);
 887                        printk (KERN_INFO "data=(%lx,%lx,%lx,%lx)\n",
 888                                ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[0],
 889                                ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[1],
 890                                ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[2],
 891                                ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[3]);
 892                        return MFM_DATA;
 893                }
 894        }
 895
 896        return 0;
 897}
 898
 899static void encode(unsigned long data, unsigned long *dest)
 900{
 901        unsigned long data2;
 902
 903        data &= 0x55555555;
 904        data2 = data ^ 0x55555555;
 905        data |= ((data2 >> 1) | 0x80000000) & (data2 << 1);
 906
 907        if (*(dest - 1) & 0x00000001)
 908                data &= 0x7FFFFFFF;
 909
 910        *dest = data;
 911}
 912
 913static void encode_block(unsigned long *dest, unsigned long *src, int len)
 914{
 915        int cnt, to_cnt = 0;
 916        unsigned long data;
 917
 918        /* odd bits */
 919        for (cnt = 0; cnt < len / 4; cnt++) {
 920                data = src[cnt] >> 1;
 921                encode(data, dest + to_cnt++);
 922        }
 923
 924        /* even bits */
 925        for (cnt = 0; cnt < len / 4; cnt++) {
 926                data = src[cnt];
 927                encode(data, dest + to_cnt++);
 928        }
 929}
 930
 931static unsigned long *putsec(int disk, unsigned long *raw, int cnt)
 932{
 933        struct header hdr;
 934        int i;
 935
 936        disk&=3;
 937        *raw = (raw[-1]&1) ? 0x2AAAAAAA : 0xAAAAAAAA;
 938        raw++;
 939        *raw++ = 0x44894489;
 940
 941        hdr.magic = 0xFF;
 942        hdr.track = unit[disk].track;
 943        hdr.sect = cnt;
 944        hdr.ord = unit[disk].dtype->sects * unit[disk].type->sect_mult - cnt;
 945        for (i = 0; i < 16; i++)
 946                hdr.labels[i] = 0;
 947        hdr.hdrchk = checksum((ulong *)&hdr,
 948                              (char *)&hdr.hdrchk-(char *)&hdr);
 949        hdr.datachk = checksum((ulong *)(unit[disk].trackbuf+cnt*512), 512);
 950
 951        encode_block(raw, (ulong *)&hdr.magic, 4);
 952        raw += 2;
 953        encode_block(raw, (ulong *)&hdr.labels, 16);
 954        raw += 8;
 955        encode_block(raw, (ulong *)&hdr.hdrchk, 4);
 956        raw += 2;
 957        encode_block(raw, (ulong *)&hdr.datachk, 4);
 958        raw += 2;
 959        encode_block(raw, (ulong *)(unit[disk].trackbuf+cnt*512), 512);
 960        raw += 256;
 961
 962        return raw;
 963}
 964
 965static void amiga_write(int disk)
 966{
 967        unsigned int cnt;
 968        unsigned long *ptr = (unsigned long *)raw_buf;
 969
 970        disk&=3;
 971        /* gap space */
 972        for (cnt = 0; cnt < 415 * unit[disk].type->sect_mult; cnt++)
 973                *ptr++ = 0xaaaaaaaa;
 974
 975        /* sectors */
 976        for (cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++)
 977                ptr = putsec (disk, ptr, cnt);
 978        *(ushort *)ptr = (ptr[-1]&1) ? 0x2AA8 : 0xAAA8;
 979}
 980
 981
 982struct dos_header {
 983        unsigned char track,   /* 0-80 */
 984                side,    /* 0-1 */
 985                sec,     /* 0-...*/
 986                len_desc;/* 2 */
 987        unsigned short crc;     /* on 68000 we got an alignment problem, 
 988                                   but this compiler solves it  by adding silently 
 989                                   adding a pad byte so data won't fit
 990                                   and this took about 3h to discover.... */
 991        unsigned char gap1[22];     /* for longword-alignedness (0x4e) */
 992};
 993
 994/* crc routines are borrowed from the messydos-handler  */
 995
 996/* excerpt from the messydos-device           
 997; The CRC is computed not only over the actual data, but including
 998; the SYNC mark (3 * $a1) and the 'ID/DATA - Address Mark' ($fe/$fb).
 999; As we don't read or encode these fields into our buffers, we have to
1000; preload the registers containing the CRC with the values they would have
1001; after stepping over these fields.
1002;
1003; How CRCs "really" work:
1004;
1005; First, you should regard a bitstring as a series of coefficients of
1006; polynomials. We calculate with these polynomials in modulo-2
1007; arithmetic, in which both add and subtract are done the same as
1008; exclusive-or. Now, we modify our data (a very long polynomial) in
1009; such a way that it becomes divisible by the CCITT-standard 16-bit
1010;                16   12   5
1011; polynomial:   x  + x  + x + 1, represented by $11021. The easiest
1012; way to do this would be to multiply (using proper arithmetic) our
1013; datablock with $11021. So we have:
1014;   data * $11021                =
1015;   data * ($10000 + $1021)      =
1016;   data * $10000 + data * $1021
1017; The left part of this is simple: Just add two 0 bytes. But then
1018; the right part (data $1021) remains difficult and even could have
1019; a carry into the left part. The solution is to use a modified
1020; multiplication, which has a result that is not correct, but with
1021; a difference of any multiple of $11021. We then only need to keep
1022; the 16 least significant bits of the result.
1023;
1024; The following algorithm does this for us:
1025;
1026;   unsigned char *data, c, crclo, crchi;
1027;   while (not done) {
1028;       c = *data++ + crchi;
1029;       crchi = (@ c) >> 8 + crclo;
1030;       crclo = @ c;
1031;   }
1032;
1033; Remember, + is done with EOR, the @ operator is in two tables (high
1034; and low byte separately), which is calculated as
1035;
1036;      $1021 * (c & $F0)
1037;  xor $1021 * (c & $0F)
1038;  xor $1021 * (c >> 4)         (* is regular multiplication)
1039;
1040;
1041; Anyway, the end result is the same as the remainder of the division of
1042; the data by $11021. I am afraid I need to study theory a bit more...
1043
1044
1045my only works was to code this from manx to C....
1046
1047*/
1048
1049static ushort dos_crc(void * data_a3, int data_d0, int data_d1, int data_d3)
1050{
1051        static unsigned char CRCTable1[] = {
1052                0x00,0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x81,0x91,0xa1,0xb1,0xc1,0xd1,0xe1,0xf1,
1053                0x12,0x02,0x32,0x22,0x52,0x42,0x72,0x62,0x93,0x83,0xb3,0xa3,0xd3,0xc3,0xf3,0xe3,
1054                0x24,0x34,0x04,0x14,0x64,0x74,0x44,0x54,0xa5,0xb5,0x85,0x95,0xe5,0xf5,0xc5,0xd5,
1055                0x36,0x26,0x16,0x06,0x76,0x66,0x56,0x46,0xb7,0xa7,0x97,0x87,0xf7,0xe7,0xd7,0xc7,
1056                0x48,0x58,0x68,0x78,0x08,0x18,0x28,0x38,0xc9,0xd9,0xe9,0xf9,0x89,0x99,0xa9,0xb9,
1057                0x5a,0x4a,0x7a,0x6a,0x1a,0x0a,0x3a,0x2a,0xdb,0xcb,0xfb,0xeb,0x9b,0x8b,0xbb,0xab,
1058                0x6c,0x7c,0x4c,0x5c,0x2c,0x3c,0x0c,0x1c,0xed,0xfd,0xcd,0xdd,0xad,0xbd,0x8d,0x9d,
1059                0x7e,0x6e,0x5e,0x4e,0x3e,0x2e,0x1e,0x0e,0xff,0xef,0xdf,0xcf,0xbf,0xaf,0x9f,0x8f,
1060                0x91,0x81,0xb1,0xa1,0xd1,0xc1,0xf1,0xe1,0x10,0x00,0x30,0x20,0x50,0x40,0x70,0x60,
1061                0x83,0x93,0xa3,0xb3,0xc3,0xd3,0xe3,0xf3,0x02,0x12,0x22,0x32,0x42,0x52,0x62,0x72,
1062                0xb5,0xa5,0x95,0x85,0xf5,0xe5,0xd5,0xc5,0x34,0x24,0x14,0x04,0x74,0x64,0x54,0x44,
1063                0xa7,0xb7,0x87,0x97,0xe7,0xf7,0xc7,0xd7,0x26,0x36,0x06,0x16,0x66,0x76,0x46,0x56,
1064                0xd9,0xc9,0xf9,0xe9,0x99,0x89,0xb9,0xa9,0x58,0x48,0x78,0x68,0x18,0x08,0x38,0x28,
1065                0xcb,0xdb,0xeb,0xfb,0x8b,0x9b,0xab,0xbb,0x4a,0x5a,0x6a,0x7a,0x0a,0x1a,0x2a,0x3a,
1066                0xfd,0xed,0xdd,0xcd,0xbd,0xad,0x9d,0x8d,0x7c,0x6c,0x5c,0x4c,0x3c,0x2c,0x1c,0x0c,
1067                0xef,0xff,0xcf,0xdf,0xaf,0xbf,0x8f,0x9f,0x6e,0x7e,0x4e,0x5e,0x2e,0x3e,0x0e,0x1e
1068        };
1069
1070        static unsigned char CRCTable2[] = {
1071                0x00,0x21,0x42,0x63,0x84,0xa5,0xc6,0xe7,0x08,0x29,0x4a,0x6b,0x8c,0xad,0xce,0xef,
1072                0x31,0x10,0x73,0x52,0xb5,0x94,0xf7,0xd6,0x39,0x18,0x7b,0x5a,0xbd,0x9c,0xff,0xde,
1073                0x62,0x43,0x20,0x01,0xe6,0xc7,0xa4,0x85,0x6a,0x4b,0x28,0x09,0xee,0xcf,0xac,0x8d,
1074                0x53,0x72,0x11,0x30,0xd7,0xf6,0x95,0xb4,0x5b,0x7a,0x19,0x38,0xdf,0xfe,0x9d,0xbc,
1075                0xc4,0xe5,0x86,0xa7,0x40,0x61,0x02,0x23,0xcc,0xed,0x8e,0xaf,0x48,0x69,0x0a,0x2b,
1076                0xf5,0xd4,0xb7,0x96,0x71,0x50,0x33,0x12,0xfd,0xdc,0xbf,0x9e,0x79,0x58,0x3b,0x1a,
1077                0xa6,0x87,0xe4,0xc5,0x22,0x03,0x60,0x41,0xae,0x8f,0xec,0xcd,0x2a,0x0b,0x68,0x49,
1078                0x97,0xb6,0xd5,0xf4,0x13,0x32,0x51,0x70,0x9f,0xbe,0xdd,0xfc,0x1b,0x3a,0x59,0x78,
1079                0x88,0xa9,0xca,0xeb,0x0c,0x2d,0x4e,0x6f,0x80,0xa1,0xc2,0xe3,0x04,0x25,0x46,0x67,
1080                0xb9,0x98,0xfb,0xda,0x3d,0x1c,0x7f,0x5e,0xb1,0x90,0xf3,0xd2,0x35,0x14,0x77,0x56,
1081                0xea,0xcb,0xa8,0x89,0x6e,0x4f,0x2c,0x0d,0xe2,0xc3,0xa0,0x81,0x66,0x47,0x24,0x05,
1082                0xdb,0xfa,0x99,0xb8,0x5f,0x7e,0x1d,0x3c,0xd3,0xf2,0x91,0xb0,0x57,0x76,0x15,0x34,
1083                0x4c,0x6d,0x0e,0x2f,0xc8,0xe9,0x8a,0xab,0x44,0x65,0x06,0x27,0xc0,0xe1,0x82,0xa3,
1084                0x7d,0x5c,0x3f,0x1e,0xf9,0xd8,0xbb,0x9a,0x75,0x54,0x37,0x16,0xf1,0xd0,0xb3,0x92,
1085                0x2e,0x0f,0x6c,0x4d,0xaa,0x8b,0xe8,0xc9,0x26,0x07,0x64,0x45,0xa2,0x83,0xe0,0xc1,
1086                0x1f,0x3e,0x5d,0x7c,0x9b,0xba,0xd9,0xf8,0x17,0x36,0x55,0x74,0x93,0xb2,0xd1,0xf0
1087        };
1088
1089/* look at the asm-code - what looks in C a bit strange is almost as good as handmade */
1090        register int i;
1091        register unsigned char *CRCT1, *CRCT2, *data, c, crch, crcl;
1092
1093        CRCT1=CRCTable1;
1094        CRCT2=CRCTable2;
1095        data=data_a3;
1096        crcl=data_d1;
1097        crch=data_d0;
1098        for (i=data_d3; i>=0; i--) {
1099                c = (*data++) ^ crch;
1100                crch = CRCT1[c] ^ crcl;
1101                crcl = CRCT2[c];
1102        }
1103        return (crch<<8)|crcl;
1104}
1105
1106static inline ushort dos_hdr_crc (struct dos_header *hdr)
1107{
1108        return dos_crc(&(hdr->track), 0xb2, 0x30, 3); /* precomputed magic */
1109}
1110
1111static inline ushort dos_data_crc(unsigned char *data)
1112{
1113        return dos_crc(data, 0xe2, 0x95 ,511); /* precomputed magic */
1114}
1115
1116static inline unsigned char dos_decode_byte(ushort word)
1117{
1118        register ushort w2;
1119        register unsigned char byte;
1120        register unsigned char *dec = mfmdecode;
1121
1122        w2=word;
1123        w2>>=8;
1124        w2&=127;
1125        byte = dec[w2];
1126        byte <<= 4;
1127        w2 = word & 127;
1128        byte |= dec[w2];
1129        return byte;
1130}
1131
1132static unsigned long dos_decode(unsigned char *data, unsigned short *raw, int len)
1133{
1134        int i;
1135
1136        for (i = 0; i < len; i++)
1137                *data++=dos_decode_byte(*raw++);
1138        return ((ulong)raw);
1139}
1140
1141#ifdef DEBUG
1142static void dbg(unsigned long ptr)
1143{
1144        printk("raw data @%08lx: %08lx, %08lx ,%08lx, %08lx\n", ptr,
1145               ((ulong *)ptr)[0], ((ulong *)ptr)[1],
1146               ((ulong *)ptr)[2], ((ulong *)ptr)[3]);
1147}
1148#endif
1149
1150static int dos_read(int drive)
1151{
1152        unsigned long end;
1153        unsigned long raw;
1154        int scnt;
1155        unsigned short crc,data_crc[2];
1156        struct dos_header hdr;
1157
1158        drive&=3;
1159        raw = (long) raw_buf;
1160        end = raw + unit[drive].type->read_size;
1161
1162        for (scnt=0; scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) {
1163                do { /* search for the right sync of each sec-hdr */
1164                        if (!(raw = scan_sync (raw, end))) {
1165                                printk(KERN_INFO "dos_read: no hdr sync on "
1166                                       "track %d, unit %d for sector %d\n",
1167                                       unit[drive].track,drive,scnt);
1168                                return MFM_NOSYNC;
1169                        }
1170#ifdef DEBUG
1171                        dbg(raw);
1172#endif
1173                } while (*((ushort *)raw)!=0x5554); /* loop usually only once done */
1174                raw+=2; /* skip over headermark */
1175                raw = dos_decode((unsigned char *)&hdr,(ushort *) raw,8);
1176                crc = dos_hdr_crc(&hdr);
1177
1178#ifdef DEBUG
1179                printk("(%3d,%d,%2d,%d) %x\n", hdr.track, hdr.side,
1180                       hdr.sec, hdr.len_desc, hdr.crc);
1181#endif
1182
1183                if (crc != hdr.crc) {
1184                        printk(KERN_INFO "dos_read: MFM_HEADER %04x,%04x\n",
1185                               hdr.crc, crc);
1186                        return MFM_HEADER;
1187                }
1188                if (hdr.track != unit[drive].track/unit[drive].type->heads) {
1189                        printk(KERN_INFO "dos_read: MFM_TRACK %d, %d\n",
1190                               hdr.track,
1191                               unit[drive].track/unit[drive].type->heads);
1192                        return MFM_TRACK;
1193                }
1194
1195                if (hdr.side != unit[drive].track%unit[drive].type->heads) {
1196                        printk(KERN_INFO "dos_read: MFM_SIDE %d, %d\n",
1197                               hdr.side,
1198                               unit[drive].track%unit[drive].type->heads);
1199                        return MFM_TRACK;
1200                }
1201
1202                if (hdr.len_desc != 2) {
1203                        printk(KERN_INFO "dos_read: unknown sector len "
1204                               "descriptor %d\n", hdr.len_desc);
1205                        return MFM_DATA;
1206                }
1207#ifdef DEBUG
1208                printk("hdr accepted\n");
1209#endif
1210                if (!(raw = scan_sync (raw, end))) {
1211                        printk(KERN_INFO "dos_read: no data sync on track "
1212                               "%d, unit %d for sector%d, disk sector %d\n",
1213                               unit[drive].track, drive, scnt, hdr.sec);
1214                        return MFM_NOSYNC;
1215                }
1216#ifdef DEBUG
1217                dbg(raw);
1218#endif
1219
1220                if (*((ushort *)raw)!=0x5545) {
1221                        printk(KERN_INFO "dos_read: no data mark after "
1222                               "sync (%d,%d,%d,%d) sc=%d\n",
1223                               hdr.track,hdr.side,hdr.sec,hdr.len_desc,scnt);
1224                        return MFM_NOSYNC;
1225                }
1226
1227                raw+=2;  /* skip data mark (included in checksum) */
1228                raw = dos_decode((unsigned char *)(unit[drive].trackbuf + (hdr.sec - 1) * 512), (ushort *) raw, 512);
1229                raw = dos_decode((unsigned char  *)data_crc,(ushort *) raw,4);
1230                crc = dos_data_crc(unit[drive].trackbuf + (hdr.sec - 1) * 512);
1231
1232                if (crc != data_crc[0]) {
1233                        printk(KERN_INFO "dos_read: MFM_DATA (%d,%d,%d,%d) "
1234                               "sc=%d, %x %x\n", hdr.track, hdr.side,
1235                               hdr.sec, hdr.len_desc, scnt,data_crc[0], crc);
1236                        printk(KERN_INFO "data=(%lx,%lx,%lx,%lx,...)\n",
1237                               ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[0],
1238                               ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[1],
1239                               ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[2],
1240                               ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[3]);
1241                        return MFM_DATA;
1242                }
1243        }
1244        return 0;
1245}
1246
1247static inline ushort dos_encode_byte(unsigned char byte)
1248{
1249        register unsigned char *enc, b2, b1;
1250        register ushort word;
1251
1252        enc=mfmencode;
1253        b1=byte;
1254        b2=b1>>4;
1255        b1&=15;
1256        word=enc[b2] <<8 | enc [b1];
1257        return (word|((word&(256|64)) ? 0: 128));
1258}
1259
1260static void dos_encode_block(ushort *dest, unsigned char *src, int len)
1261{
1262        int i;
1263
1264        for (i = 0; i < len; i++) {
1265                *dest=dos_encode_byte(*src++);
1266                *dest|=((dest[-1]&1)||(*dest&0x4000))? 0: 0x8000;
1267                dest++;
1268        }
1269}
1270
1271static unsigned long *ms_putsec(int drive, unsigned long *raw, int cnt)
1272{
1273        static struct dos_header hdr={0,0,0,2,0,
1274          {78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78}};
1275        int i;
1276        static ushort crc[2]={0,0x4e4e};
1277
1278        drive&=3;
1279/* id gap 1 */
1280/* the MFM word before is always 9254 */
1281        for(i=0;i<6;i++)
1282                *raw++=0xaaaaaaaa;
1283/* 3 sync + 1 headermark */
1284        *raw++=0x44894489;
1285        *raw++=0x44895554;
1286
1287/* fill in the variable parts of the header */
1288        hdr.track=unit[drive].track/unit[drive].type->heads;
1289        hdr.side=unit[drive].track%unit[drive].type->heads;
1290        hdr.sec=cnt+1;
1291        hdr.crc=dos_hdr_crc(&hdr);
1292
1293/* header (without "magic") and id gap 2*/
1294        dos_encode_block((ushort *)raw,(unsigned char *) &hdr.track,28);
1295        raw+=14;
1296
1297/*id gap 3 */
1298        for(i=0;i<6;i++)
1299                *raw++=0xaaaaaaaa;
1300
1301/* 3 syncs and 1 datamark */
1302        *raw++=0x44894489;
1303        *raw++=0x44895545;
1304
1305/* data */
1306        dos_encode_block((ushort *)raw,
1307                         (unsigned char *)unit[drive].trackbuf+cnt*512,512);
1308        raw+=256;
1309
1310/*data crc + jd's special gap (long words :-/) */
1311        crc[0]=dos_data_crc(unit[drive].trackbuf+cnt*512);
1312        dos_encode_block((ushort *) raw,(unsigned char *)crc,4);
1313        raw+=2;
1314
1315/* data gap */
1316        for(i=0;i<38;i++)
1317                *raw++=0x92549254;
1318
1319        return raw; /* wrote 652 MFM words */
1320}
1321
1322static void dos_write(int disk)
1323{
1324        int cnt;
1325        unsigned long raw = (unsigned long) raw_buf;
1326        unsigned long *ptr=(unsigned long *)raw;
1327
1328        disk&=3;
1329/* really gap4 + indexgap , but we write it first and round it up */
1330        for (cnt=0;cnt<425;cnt++)
1331                *ptr++=0x92549254;
1332
1333/* the following is just guessed */
1334        if (unit[disk].type->sect_mult==2)  /* check for HD-Disks */
1335                for(cnt=0;cnt<473;cnt++)
1336                        *ptr++=0x92549254;
1337
1338/* now the index marks...*/
1339        for (cnt=0;cnt<20;cnt++)
1340                *ptr++=0x92549254;
1341        for (cnt=0;cnt<6;cnt++)
1342                *ptr++=0xaaaaaaaa;
1343        *ptr++=0x52245224;
1344        *ptr++=0x52245552;
1345        for (cnt=0;cnt<20;cnt++)
1346                *ptr++=0x92549254;
1347
1348/* sectors */
1349        for(cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++)
1350                ptr=ms_putsec(disk,ptr,cnt);
1351
1352        *(ushort *)ptr = 0xaaa8; /* MFM word before is always 0x9254 */
1353}
1354
1355/*
1356 * Here comes the high level stuff (i.e. the filesystem interface)
1357 * and helper functions.
1358 * Normally this should be the only part that has to be adapted to
1359 * different kernel versions.
1360 */
1361
1362/* FIXME: this assumes the drive is still spinning -
1363 * which is only true if we complete writing a track within three seconds
1364 */
1365static void flush_track_callback(struct timer_list *timer)
1366{
1367        unsigned long nr = ((unsigned long)timer -
1368                               (unsigned long)&flush_track_timer[0]) /
1369                                        sizeof(flush_track_timer[0]);
1370
1371        nr&=3;
1372        writefromint = 1;
1373        if (!try_fdc(nr)) {
1374                /* we might block in an interrupt, so try again later */
1375                flush_track_timer[nr].expires = jiffies + 1;
1376                add_timer(flush_track_timer + nr);
1377                return;
1378        }
1379        get_fdc(nr);
1380        (*unit[nr].dtype->write_fkt)(nr);
1381        if (!raw_write(nr)) {
1382                printk (KERN_NOTICE "floppy disk write protected\n");
1383                writefromint = 0;
1384                writepending = 0;
1385        }
1386        rel_fdc();
1387}
1388
1389static int non_int_flush_track (unsigned long nr)
1390{
1391        unsigned long flags;
1392
1393        nr&=3;
1394        writefromint = 0;
1395        del_timer(&post_write_timer);
1396        get_fdc(nr);
1397        if (!fd_motor_on(nr)) {
1398                writepending = 0;
1399                rel_fdc();
1400                return 0;
1401        }
1402        local_irq_save(flags);
1403        if (writepending != 2) {
1404                local_irq_restore(flags);
1405                (*unit[nr].dtype->write_fkt)(nr);
1406                if (!raw_write(nr)) {
1407                        printk (KERN_NOTICE "floppy disk write protected "
1408                                "in write!\n");
1409                        writepending = 0;
1410                        return 0;
1411                }
1412                wait_event(wait_fd_block, block_flag != 2);
1413        }
1414        else {
1415                local_irq_restore(flags);
1416                ms_delay(2); /* 2 ms post_write delay */
1417                post_write(nr);
1418        }
1419        rel_fdc();
1420        return 1;
1421}
1422
1423static int get_track(int drive, int track)
1424{
1425        int error, errcnt;
1426
1427        drive&=3;
1428        if (unit[drive].track == track)
1429                return 0;
1430        get_fdc(drive);
1431        if (!fd_motor_on(drive)) {
1432                rel_fdc();
1433                return -1;
1434        }
1435
1436        if (unit[drive].dirty == 1) {
1437                del_timer (flush_track_timer + drive);
1438                non_int_flush_track (drive);
1439        }
1440        errcnt = 0;
1441        while (errcnt < MAX_ERRORS) {
1442                if (!fd_seek(drive, track))
1443                        return -1;
1444                raw_read(drive);
1445                error = (*unit[drive].dtype->read_fkt)(drive);
1446                if (error == 0) {
1447                        rel_fdc();
1448                        return 0;
1449                }
1450                /* Read Error Handling: recalibrate and try again */
1451                unit[drive].track = -1;
1452                errcnt++;
1453        }
1454        rel_fdc();
1455        return -1;
1456}
1457
1458static blk_status_t amiflop_rw_cur_segment(struct amiga_floppy_struct *floppy,
1459                                           struct request *rq)
1460{
1461        int drive = floppy - unit;
1462        unsigned int cnt, block, track, sector;
1463        char *data;
1464
1465        for (cnt = 0; cnt < blk_rq_cur_sectors(rq); cnt++) {
1466#ifdef DEBUG
1467                printk("fd: sector %ld + %d requested for %s\n",
1468                       blk_rq_pos(rq), cnt,
1469                       (rq_data_dir(rq) == READ) ? "read" : "write");
1470#endif
1471                block = blk_rq_pos(rq) + cnt;
1472                track = block / (floppy->dtype->sects * floppy->type->sect_mult);
1473                sector = block % (floppy->dtype->sects * floppy->type->sect_mult);
1474                data = bio_data(rq->bio) + 512 * cnt;
1475#ifdef DEBUG
1476                printk("access to track %d, sector %d, with buffer at "
1477                       "0x%08lx\n", track, sector, data);
1478#endif
1479
1480                if (get_track(drive, track) == -1)
1481                        return BLK_STS_IOERR;
1482
1483                if (rq_data_dir(rq) == READ) {
1484                        memcpy(data, floppy->trackbuf + sector * 512, 512);
1485                } else {
1486                        memcpy(floppy->trackbuf + sector * 512, data, 512);
1487
1488                        /* keep the drive spinning while writes are scheduled */
1489                        if (!fd_motor_on(drive))
1490                                return BLK_STS_IOERR;
1491                        /*
1492                         * setup a callback to write the track buffer
1493                         * after a short (1 tick) delay.
1494                         */
1495                        floppy->dirty = 1;
1496                        /* reset the timer */
1497                        mod_timer (flush_track_timer + drive, jiffies + 1);
1498                }
1499        }
1500
1501        return BLK_STS_OK;
1502}
1503
1504static blk_status_t amiflop_queue_rq(struct blk_mq_hw_ctx *hctx,
1505                                     const struct blk_mq_queue_data *bd)
1506{
1507        struct request *rq = bd->rq;
1508        struct amiga_floppy_struct *floppy = rq->rq_disk->private_data;
1509        blk_status_t err;
1510
1511        if (!spin_trylock_irq(&amiflop_lock))
1512                return BLK_STS_DEV_RESOURCE;
1513
1514        blk_mq_start_request(rq);
1515
1516        do {
1517                err = amiflop_rw_cur_segment(floppy, rq);
1518        } while (blk_update_request(rq, err, blk_rq_cur_bytes(rq)));
1519        blk_mq_end_request(rq, err);
1520
1521        spin_unlock_irq(&amiflop_lock);
1522        return BLK_STS_OK;
1523}
1524
1525static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1526{
1527        int drive = MINOR(bdev->bd_dev) & 3;
1528
1529        geo->heads = unit[drive].type->heads;
1530        geo->sectors = unit[drive].dtype->sects * unit[drive].type->sect_mult;
1531        geo->cylinders = unit[drive].type->tracks;
1532        return 0;
1533}
1534
1535static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode,
1536                    unsigned int cmd, unsigned long param)
1537{
1538        struct amiga_floppy_struct *p = bdev->bd_disk->private_data;
1539        int drive = p - unit;
1540        static struct floppy_struct getprm;
1541        void __user *argp = (void __user *)param;
1542
1543        switch(cmd){
1544        case FDFMTBEG:
1545                get_fdc(drive);
1546                if (fd_ref[drive] > 1) {
1547                        rel_fdc();
1548                        return -EBUSY;
1549                }
1550                fsync_bdev(bdev);
1551                if (fd_motor_on(drive) == 0) {
1552                        rel_fdc();
1553                        return -ENODEV;
1554                }
1555                if (fd_calibrate(drive) == 0) {
1556                        rel_fdc();
1557                        return -ENXIO;
1558                }
1559                floppy_off(drive);
1560                rel_fdc();
1561                break;
1562        case FDFMTTRK:
1563                if (param < p->type->tracks * p->type->heads)
1564                {
1565                        get_fdc(drive);
1566                        if (fd_seek(drive,param) != 0){
1567                                memset(p->trackbuf, FD_FILL_BYTE,
1568                                       p->dtype->sects * p->type->sect_mult * 512);
1569                                non_int_flush_track(drive);
1570                        }
1571                        floppy_off(drive);
1572                        rel_fdc();
1573                }
1574                else
1575                        return -EINVAL;
1576                break;
1577        case FDFMTEND:
1578                floppy_off(drive);
1579                invalidate_bdev(bdev);
1580                break;
1581        case FDGETPRM:
1582                memset((void *)&getprm, 0, sizeof (getprm));
1583                getprm.track=p->type->tracks;
1584                getprm.head=p->type->heads;
1585                getprm.sect=p->dtype->sects * p->type->sect_mult;
1586                getprm.size=p->blocks;
1587                if (copy_to_user(argp, &getprm, sizeof(struct floppy_struct)))
1588                        return -EFAULT;
1589                break;
1590        case FDSETPRM:
1591        case FDDEFPRM:
1592                return -EINVAL;
1593        case FDFLUSH: /* unconditionally, even if not needed */
1594                del_timer (flush_track_timer + drive);
1595                non_int_flush_track(drive);
1596                break;
1597#ifdef RAW_IOCTL
1598        case IOCTL_RAW_TRACK:
1599                if (copy_to_user(argp, raw_buf, p->type->read_size))
1600                        return -EFAULT;
1601                else
1602                        return p->type->read_size;
1603#endif
1604        default:
1605                return -ENOSYS;
1606        }
1607        return 0;
1608}
1609
1610static int fd_ioctl(struct block_device *bdev, fmode_t mode,
1611                             unsigned int cmd, unsigned long param)
1612{
1613        int ret;
1614
1615        mutex_lock(&amiflop_mutex);
1616        ret = fd_locked_ioctl(bdev, mode, cmd, param);
1617        mutex_unlock(&amiflop_mutex);
1618
1619        return ret;
1620}
1621
1622static void fd_probe(int dev)
1623{
1624        unsigned long code;
1625        int type;
1626        int drive;
1627
1628        drive = dev & 3;
1629        code = fd_get_drive_id(drive);
1630
1631        /* get drive type */
1632        for (type = 0; type < num_dr_types; type++)
1633                if (drive_types[type].code == code)
1634                        break;
1635
1636        if (type >= num_dr_types) {
1637                printk(KERN_WARNING "fd_probe: unsupported drive type "
1638                       "%08lx found\n", code);
1639                unit[drive].type = &drive_types[num_dr_types-1]; /* FD_NODRIVE */
1640                return;
1641        }
1642
1643        unit[drive].type = drive_types + type;
1644        unit[drive].track = -1;
1645
1646        unit[drive].disk = -1;
1647        unit[drive].motor = 0;
1648        unit[drive].busy = 0;
1649        unit[drive].status = -1;
1650}
1651
1652/*
1653 * floppy_open check for aliasing (/dev/fd0 can be the same as
1654 * /dev/PS0 etc), and disallows simultaneous access to the same
1655 * drive with different device numbers.
1656 */
1657static int floppy_open(struct block_device *bdev, fmode_t mode)
1658{
1659        int drive = MINOR(bdev->bd_dev) & 3;
1660        int system =  (MINOR(bdev->bd_dev) & 4) >> 2;
1661        int old_dev;
1662        unsigned long flags;
1663
1664        mutex_lock(&amiflop_mutex);
1665        old_dev = fd_device[drive];
1666
1667        if (fd_ref[drive] && old_dev != system) {
1668                mutex_unlock(&amiflop_mutex);
1669                return -EBUSY;
1670        }
1671
1672        if (unit[drive].type->code == FD_NODRIVE) {
1673                mutex_unlock(&amiflop_mutex);
1674                return -ENXIO;
1675        }
1676
1677        if (mode & (FMODE_READ|FMODE_WRITE)) {
1678                bdev_check_media_change(bdev);
1679                if (mode & FMODE_WRITE) {
1680                        int wrprot;
1681
1682                        get_fdc(drive);
1683                        fd_select (drive);
1684                        wrprot = !(ciaa.pra & DSKPROT);
1685                        fd_deselect (drive);
1686                        rel_fdc();
1687
1688                        if (wrprot) {
1689                                mutex_unlock(&amiflop_mutex);
1690                                return -EROFS;
1691                        }
1692                }
1693        }
1694
1695        local_irq_save(flags);
1696        fd_ref[drive]++;
1697        fd_device[drive] = system;
1698        local_irq_restore(flags);
1699
1700        unit[drive].dtype=&data_types[system];
1701        unit[drive].blocks=unit[drive].type->heads*unit[drive].type->tracks*
1702                data_types[system].sects*unit[drive].type->sect_mult;
1703        set_capacity(unit[drive].gendisk[system], unit[drive].blocks);
1704
1705        printk(KERN_INFO "fd%d: accessing %s-disk with %s-layout\n",drive,
1706               unit[drive].type->name, data_types[system].name);
1707
1708        mutex_unlock(&amiflop_mutex);
1709        return 0;
1710}
1711
1712static void floppy_release(struct gendisk *disk, fmode_t mode)
1713{
1714        struct amiga_floppy_struct *p = disk->private_data;
1715        int drive = p - unit;
1716
1717        mutex_lock(&amiflop_mutex);
1718        if (unit[drive].dirty == 1) {
1719                del_timer (flush_track_timer + drive);
1720                non_int_flush_track (drive);
1721        }
1722  
1723        if (!fd_ref[drive]--) {
1724                printk(KERN_CRIT "floppy_release with fd_ref == 0");
1725                fd_ref[drive] = 0;
1726        }
1727#ifdef MODULE
1728        floppy_off (drive);
1729#endif
1730        mutex_unlock(&amiflop_mutex);
1731}
1732
1733/*
1734 * check_events is never called from an interrupt, so we can relax a bit
1735 * here, sleep etc. Note that floppy-on tries to set current_DOR to point
1736 * to the desired drive, but it will probably not survive the sleep if
1737 * several floppies are used at the same time: thus the loop.
1738 */
1739static unsigned amiga_check_events(struct gendisk *disk, unsigned int clearing)
1740{
1741        struct amiga_floppy_struct *p = disk->private_data;
1742        int drive = p - unit;
1743        int changed;
1744        static int first_time = 1;
1745
1746        if (first_time)
1747                changed = first_time--;
1748        else {
1749                get_fdc(drive);
1750                fd_select (drive);
1751                changed = !(ciaa.pra & DSKCHANGE);
1752                fd_deselect (drive);
1753                rel_fdc();
1754        }
1755
1756        if (changed) {
1757                fd_probe(drive);
1758                p->track = -1;
1759                p->dirty = 0;
1760                writepending = 0; /* if this was true before, too bad! */
1761                writefromint = 0;
1762                return DISK_EVENT_MEDIA_CHANGE;
1763        }
1764        return 0;
1765}
1766
1767static const struct block_device_operations floppy_fops = {
1768        .owner          = THIS_MODULE,
1769        .open           = floppy_open,
1770        .release        = floppy_release,
1771        .ioctl          = fd_ioctl,
1772        .getgeo         = fd_getgeo,
1773        .check_events   = amiga_check_events,
1774};
1775
1776static const struct blk_mq_ops amiflop_mq_ops = {
1777        .queue_rq = amiflop_queue_rq,
1778};
1779
1780static int fd_alloc_disk(int drive, int system)
1781{
1782        struct gendisk *disk;
1783
1784        disk = blk_mq_alloc_disk(&unit[drive].tag_set, NULL);
1785        if (IS_ERR(disk))
1786                return PTR_ERR(disk);
1787
1788        disk->major = FLOPPY_MAJOR;
1789        disk->first_minor = drive + system;
1790        disk->minors = 1;
1791        disk->fops = &floppy_fops;
1792        disk->events = DISK_EVENT_MEDIA_CHANGE;
1793        if (system)
1794                sprintf(disk->disk_name, "fd%d_msdos", drive);
1795        else
1796                sprintf(disk->disk_name, "fd%d", drive);
1797        disk->private_data = &unit[drive];
1798        set_capacity(disk, 880 * 2);
1799
1800        unit[drive].gendisk[system] = disk;
1801        add_disk(disk);
1802        return 0;
1803}
1804
1805static int fd_alloc_drive(int drive)
1806{
1807        unit[drive].trackbuf = kmalloc(FLOPPY_MAX_SECTORS * 512, GFP_KERNEL);
1808        if (!unit[drive].trackbuf)
1809                goto out;
1810
1811        memset(&unit[drive].tag_set, 0, sizeof(unit[drive].tag_set));
1812        unit[drive].tag_set.ops = &amiflop_mq_ops;
1813        unit[drive].tag_set.nr_hw_queues = 1;
1814        unit[drive].tag_set.nr_maps = 1;
1815        unit[drive].tag_set.queue_depth = 2;
1816        unit[drive].tag_set.numa_node = NUMA_NO_NODE;
1817        unit[drive].tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
1818        if (blk_mq_alloc_tag_set(&unit[drive].tag_set))
1819                goto out_cleanup_trackbuf;
1820
1821        pr_cont(" fd%d", drive);
1822
1823        if (fd_alloc_disk(drive, 0) || fd_alloc_disk(drive, 1))
1824                goto out_cleanup_tagset;
1825        return 0;
1826
1827out_cleanup_tagset:
1828        blk_mq_free_tag_set(&unit[drive].tag_set);
1829out_cleanup_trackbuf:
1830        kfree(unit[drive].trackbuf);
1831out:
1832        unit[drive].type->code = FD_NODRIVE;
1833        return -ENOMEM;
1834}
1835
1836static int __init fd_probe_drives(void)
1837{
1838        int drive,drives,nomem;
1839
1840        pr_info("FD: probing units\nfound");
1841        drives=0;
1842        nomem=0;
1843        for(drive=0;drive<FD_MAX_UNITS;drive++) {
1844                fd_probe(drive);
1845                if (unit[drive].type->code == FD_NODRIVE)
1846                        continue;
1847
1848                if (fd_alloc_drive(drive) < 0) {
1849                        pr_cont(" no mem for fd%d", drive);
1850                        nomem = 1;
1851                        continue;
1852                }
1853                drives++;
1854        }
1855        if ((drives > 0) || (nomem == 0)) {
1856                if (drives == 0)
1857                        pr_cont(" no drives");
1858                pr_cont("\n");
1859                return drives;
1860        }
1861        pr_cont("\n");
1862        return -ENOMEM;
1863}
1864 
1865static int __init amiga_floppy_probe(struct platform_device *pdev)
1866{
1867        int i, ret;
1868
1869        if (register_blkdev(FLOPPY_MAJOR,"fd"))
1870                return -EBUSY;
1871
1872        ret = -ENOMEM;
1873        raw_buf = amiga_chip_alloc(RAW_BUF_SIZE, "Floppy");
1874        if (!raw_buf) {
1875                printk("fd: cannot get chip mem buffer\n");
1876                goto out_blkdev;
1877        }
1878
1879        ret = -EBUSY;
1880        if (request_irq(IRQ_AMIGA_DSKBLK, fd_block_done, 0, "floppy_dma", NULL)) {
1881                printk("fd: cannot get irq for dma\n");
1882                goto out_irq;
1883        }
1884
1885        if (request_irq(IRQ_AMIGA_CIAA_TB, ms_isr, 0, "floppy_timer", NULL)) {
1886                printk("fd: cannot get irq for timer\n");
1887                goto out_irq2;
1888        }
1889
1890        ret = -ENODEV;
1891        if (fd_probe_drives() < 1) /* No usable drives */
1892                goto out_probe;
1893
1894        /* initialize variables */
1895        timer_setup(&motor_on_timer, motor_on_callback, 0);
1896        motor_on_timer.expires = 0;
1897        for (i = 0; i < FD_MAX_UNITS; i++) {
1898                timer_setup(&motor_off_timer[i], fd_motor_off, 0);
1899                motor_off_timer[i].expires = 0;
1900                timer_setup(&flush_track_timer[i], flush_track_callback, 0);
1901                flush_track_timer[i].expires = 0;
1902
1903                unit[i].track = -1;
1904        }
1905
1906        timer_setup(&post_write_timer, post_write_callback, 0);
1907        post_write_timer.expires = 0;
1908  
1909        for (i = 0; i < 128; i++)
1910                mfmdecode[i]=255;
1911        for (i = 0; i < 16; i++)
1912                mfmdecode[mfmencode[i]]=i;
1913
1914        /* make sure that disk DMA is enabled */
1915        custom.dmacon = DMAF_SETCLR | DMAF_DISK;
1916
1917        /* init ms timer */
1918        ciaa.crb = 8; /* one-shot, stop */
1919        return 0;
1920
1921out_probe:
1922        free_irq(IRQ_AMIGA_CIAA_TB, NULL);
1923out_irq2:
1924        free_irq(IRQ_AMIGA_DSKBLK, NULL);
1925out_irq:
1926        amiga_chip_free(raw_buf);
1927out_blkdev:
1928        unregister_blkdev(FLOPPY_MAJOR,"fd");
1929        return ret;
1930}
1931
1932static struct platform_driver amiga_floppy_driver = {
1933        .driver   = {
1934                .name   = "amiga-floppy",
1935        },
1936};
1937
1938static int __init amiga_floppy_init(void)
1939{
1940        return platform_driver_probe(&amiga_floppy_driver, amiga_floppy_probe);
1941}
1942
1943module_init(amiga_floppy_init);
1944
1945#ifndef MODULE
1946static int __init amiga_floppy_setup (char *str)
1947{
1948        int n;
1949        if (!MACH_IS_AMIGA)
1950                return 0;
1951        if (!get_option(&str, &n))
1952                return 0;
1953        printk (KERN_INFO "amiflop: Setting default df0 to %x\n", n);
1954        fd_def_df0 = n;
1955        return 1;
1956}
1957
1958__setup("floppy=", amiga_floppy_setup);
1959#endif
1960
1961MODULE_ALIAS("platform:amiga-floppy");
1962