drivers/block/swim.c

   1 /*
   2  * Driver for SWIM (Sander Woz Integrated Machine) floppy controller
   3  *
   4  * Copyright (C) 2004,2008 Laurent Vivier <Laurent@lvivier.info>
   5  *
   6  * based on Alastair Bridgewater SWIM analysis, 2001
   7  * based on SWIM3 driver (c) Paul Mackerras, 1996
   8  * based on netBSD IWM driver (c) 1997, 1998 Hauke Fath.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version
  13  * 2 of the License, or (at your option) any later version.
  14  *
  15  * 2004-08-21 (lv) - Initial implementation
  16  * 2008-10-30 (lv) - Port to 2.6
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/fd.h>
  21 #include <linux/slab.h>
  22 #include <linux/blkdev.h>
  23 #include <linux/mutex.h>
  24 #include <linux/hdreg.h>
  25 #include <linux/kernel.h>
  26 #include <linux/delay.h>
  27 #include <linux/platform_device.h>
  28
  29 #include <asm/mac_via.h>
  30
  31 #define CARDNAME "swim"
  32
  33 struct sector_header {
  34         unsigned char side;
  35         unsigned char track;
  36         unsigned char sector;
  37         unsigned char size;
  38         unsigned char crc0;
  39         unsigned char crc1;
  40 } __attribute__((packed));
  41
  42 #define DRIVER_VERSION "Version 0.2 (2008-10-30)"
  43
  44 #define REG(x)  unsigned char x, x ## _pad[0x200 - 1];
  45
  46 struct swim {
  47         REG(write_data)
  48         REG(write_mark)
  49         REG(write_CRC)
  50         REG(write_parameter)
  51         REG(write_phase)
  52         REG(write_setup)
  53         REG(write_mode0)
  54         REG(write_mode1)
  55
  56         REG(read_data)
  57         REG(read_mark)
  58         REG(read_error)
  59         REG(read_parameter)
  60         REG(read_phase)
  61         REG(read_setup)
  62         REG(read_status)
  63         REG(read_handshake)
  64 } __attribute__((packed));
  65
  66 #define swim_write(base, reg, v)        out_8(&(base)->write_##reg, (v))
  67 #define swim_read(base, reg)            in_8(&(base)->read_##reg)
  68
  69 /* IWM registers */
  70
  71 struct iwm {
  72         REG(ph0L)
  73         REG(ph0H)
  74         REG(ph1L)
  75         REG(ph1H)
  76         REG(ph2L)
  77         REG(ph2H)
  78         REG(ph3L)
  79         REG(ph3H)
  80         REG(mtrOff)
  81         REG(mtrOn)
  82         REG(intDrive)
  83         REG(extDrive)
  84         REG(q6L)
  85         REG(q6H)
  86         REG(q7L)
  87         REG(q7H)
  88 } __attribute__((packed));
  89
  90 #define iwm_write(base, reg, v)         out_8(&(base)->reg, (v))
  91 #define iwm_read(base, reg)             in_8(&(base)->reg)
  92
  93 /* bits in phase register */
  94
  95 #define SEEK_POSITIVE   0x070
  96 #define SEEK_NEGATIVE   0x074
  97 #define STEP            0x071
  98 #define MOTOR_ON        0x072
  99 #define MOTOR_OFF       0x076
 100 #define INDEX           0x073
 101 #define EJECT           0x077
 102 #define SETMFM          0x171
 103 #define SETGCR          0x175
 104
 105 #define RELAX           0x033
 106 #define LSTRB           0x008
 107
 108 #define CA_MASK         0x077
 109
 110 /* Select values for swim_select and swim_readbit */
 111
 112 #define READ_DATA_0     0x074
 113 #define TWOMEG_DRIVE    0x075
 114 #define SINGLE_SIDED    0x076
 115 #define DRIVE_PRESENT   0x077
 116 #define DISK_IN         0x170
 117 #define WRITE_PROT      0x171
 118 #define TRACK_ZERO      0x172
 119 #define TACHO           0x173
 120 #define READ_DATA_1     0x174
 121 #define MFM_MODE        0x175
 122 #define SEEK_COMPLETE   0x176
 123 #define ONEMEG_MEDIA    0x177
 124
 125 /* Bits in handshake register */
 126
 127 #define MARK_BYTE       0x01
 128 #define CRC_ZERO        0x02
 129 #define RDDATA          0x04
 130 #define SENSE           0x08
 131 #define MOTEN           0x10
 132 #define ERROR           0x20
 133 #define DAT2BYTE        0x40
 134 #define DAT1BYTE        0x80
 135
 136 /* bits in setup register */
 137
 138 #define S_INV_WDATA     0x01
 139 #define S_3_5_SELECT    0x02
 140 #define S_GCR           0x04
 141 #define S_FCLK_DIV2     0x08
 142 #define S_ERROR_CORR    0x10
 143 #define S_IBM_DRIVE     0x20
 144 #define S_GCR_WRITE     0x40
 145 #define S_TIMEOUT       0x80
 146
 147 /* bits in mode register */
 148
 149 #define CLFIFO          0x01
 150 #define ENBL1           0x02
 151 #define ENBL2           0x04
 152 #define ACTION          0x08
 153 #define WRITE_MODE      0x10
 154 #define HEDSEL          0x20
 155 #define MOTON           0x80
 156
 157 /*----------------------------------------------------------------------------*/
 158
 159 enum drive_location {
 160         INTERNAL_DRIVE = 0x02,
 161         EXTERNAL_DRIVE = 0x04,
 162 };
 163
 164 enum media_type {
 165         DD_MEDIA,
 166         HD_MEDIA,
 167 };
 168
 169 struct floppy_state {
 170
 171         /* physical properties */
 172
 173         enum drive_location location;   /* internal or external drive */
 174         int              head_number;   /* single- or double-sided drive */
 175
 176         /* media */
 177
 178         int              disk_in;
 179         int              ejected;
 180         enum media_type  type;
 181         int              write_protected;
 182
 183         int              total_secs;
 184         int              secpercyl;
 185         int              secpertrack;
 186
 187         /* in-use information */
 188
 189         int             track;
 190         int             ref_count;
 191
 192         struct gendisk *disk;
 193
 194         /* parent controller */
 195
 196         struct swim_priv *swd;
 197 };
 198
 199 enum motor_action {
 200         OFF,
 201         ON,
 202 };
 203
 204 enum head {
 205         LOWER_HEAD = 0,
 206         UPPER_HEAD = 1,
 207 };
 208
 209 #define FD_MAX_UNIT     2
 210
 211 struct swim_priv {
 212         struct swim __iomem *base;
 213         spinlock_t lock;
 214         struct request_queue *queue;
 215         int floppy_count;
 216         struct floppy_state unit[FD_MAX_UNIT];
 217 };
 218
 219 extern int swim_read_sector_header(struct swim __iomem *base,
 220                                    struct sector_header *header);
 221 extern int swim_read_sector_data(struct swim __iomem *base,
 222                                  unsigned char *data);
 223
 224 static DEFINE_MUTEX(swim_mutex);
 225 static inline void set_swim_mode(struct swim __iomem *base, int enable)
 226 {
 227         struct iwm __iomem *iwm_base;
 228         unsigned long flags;
 229
 230         if (!enable) {
 231                 swim_write(base, mode0, 0xf8);
 232                 return;
 233         }
 234
 235         iwm_base = (struct iwm __iomem *)base;
 236         local_irq_save(flags);
 237
 238         iwm_read(iwm_base, q7L);
 239         iwm_read(iwm_base, mtrOff);
 240         iwm_read(iwm_base, q6H);
 241
 242         iwm_write(iwm_base, q7H, 0x57);
 243         iwm_write(iwm_base, q7H, 0x17);
 244         iwm_write(iwm_base, q7H, 0x57);
 245         iwm_write(iwm_base, q7H, 0x57);
 246
 247         local_irq_restore(flags);
 248 }
 249
 250 static inline int get_swim_mode(struct swim __iomem *base)
 251 {
 252         unsigned long flags;
 253
 254         local_irq_save(flags);
 255
 256         swim_write(base, phase, 0xf5);
 257         if (swim_read(base, phase) != 0xf5)
 258                 goto is_iwm;
 259         swim_write(base, phase, 0xf6);
 260         if (swim_read(base, phase) != 0xf6)
 261                 goto is_iwm;
 262         swim_write(base, phase, 0xf7);
 263         if (swim_read(base, phase) != 0xf7)
 264                 goto is_iwm;
 265         local_irq_restore(flags);
 266         return 1;
 267 is_iwm:
 268         local_irq_restore(flags);
 269         return 0;
 270 }
 271
 272 static inline void swim_select(struct swim __iomem *base, int sel)
 273 {
 274         swim_write(base, phase, RELAX);
 275
 276         via1_set_head(sel & 0x100);
 277
 278         swim_write(base, phase, sel & CA_MASK);
 279 }
 280
 281 static inline void swim_action(struct swim __iomem *base, int action)
 282 {
 283         unsigned long flags;
 284
 285         local_irq_save(flags);
 286
 287         swim_select(base, action);
 288         udelay(1);
 289         swim_write(base, phase, (LSTRB<<4) | LSTRB);
 290         udelay(1);
 291         swim_write(base, phase, (LSTRB<<4) | ((~LSTRB) & 0x0F));
 292         udelay(1);
 293
 294         local_irq_restore(flags);
 295 }
 296
 297 static inline int swim_readbit(struct swim __iomem *base, int bit)
 298 {
 299         int stat;
 300
 301         swim_select(base, bit);
 302
 303         udelay(10);
 304
 305         stat = swim_read(base, handshake);
 306
 307         return (stat & SENSE) == 0;
 308 }
 309
 310 static inline void swim_drive(struct swim __iomem *base,
 311                               enum drive_location location)
 312 {
 313         if (location == INTERNAL_DRIVE) {
 314                 swim_write(base, mode0, EXTERNAL_DRIVE); /* clear drive 1 bit */
 315                 swim_write(base, mode1, INTERNAL_DRIVE); /* set drive 0 bit */
 316         } else if (location == EXTERNAL_DRIVE) {
 317                 swim_write(base, mode0, INTERNAL_DRIVE); /* clear drive 0 bit */
 318                 swim_write(base, mode1, EXTERNAL_DRIVE); /* set drive 1 bit */
 319         }
 320 }
 321
 322 static inline void swim_motor(struct swim __iomem *base,
 323                               enum motor_action action)
 324 {
 325         if (action == ON) {
 326                 int i;
 327
 328                 swim_action(base, MOTOR_ON);
 329
 330                 for (i = 0; i < 2*HZ; i++) {
 331                         swim_select(base, RELAX);
 332                         if (swim_readbit(base, MOTOR_ON))
 333                                 break;
 334                         current->state = TASK_INTERRUPTIBLE;
 335                         schedule_timeout(1);
 336                 }
 337         } else if (action == OFF) {
 338                 swim_action(base, MOTOR_OFF);
 339                 swim_select(base, RELAX);
 340         }
 341 }
 342
 343 static inline void swim_eject(struct swim __iomem *base)
 344 {
 345         int i;
 346
 347         swim_action(base, EJECT);
 348
 349         for (i = 0; i < 2*HZ; i++) {
 350                 swim_select(base, RELAX);
 351                 if (!swim_readbit(base, DISK_IN))
 352                         break;
 353                 current->state = TASK_INTERRUPTIBLE;
 354                 schedule_timeout(1);
 355         }
 356         swim_select(base, RELAX);
 357 }
 358
 359 static inline void swim_head(struct swim __iomem *base, enum head head)
 360 {
 361         /* wait drive is ready */
 362
 363         if (head == UPPER_HEAD)
 364                 swim_select(base, READ_DATA_1);
 365         else if (head == LOWER_HEAD)
 366                 swim_select(base, READ_DATA_0);
 367 }
 368
 369 static inline int swim_step(struct swim __iomem *base)
 370 {
 371         int wait;
 372
 373         swim_action(base, STEP);
 374
 375         for (wait = 0; wait < HZ; wait++) {
 376
 377                 current->state = TASK_INTERRUPTIBLE;
 378                 schedule_timeout(1);
 379
 380                 swim_select(base, RELAX);
 381                 if (!swim_readbit(base, STEP))
 382                         return 0;
 383         }
 384         return -1;
 385 }
 386
 387 static inline int swim_track00(struct swim __iomem *base)
 388 {
 389         int try;
 390
 391         swim_action(base, SEEK_NEGATIVE);
 392
 393         for (try = 0; try < 100; try++) {
 394
 395                 swim_select(base, RELAX);
 396                 if (swim_readbit(base, TRACK_ZERO))
 397                         break;
 398
 399                 if (swim_step(base))
 400                         return -1;
 401         }
 402
 403         if (swim_readbit(base, TRACK_ZERO))
 404                 return 0;
 405
 406         return -1;
 407 }
 408
 409 static inline int swim_seek(struct swim __iomem *base, int step)
 410 {
 411         if (step == 0)
 412                 return 0;
 413
 414         if (step < 0) {
 415                 swim_action(base, SEEK_NEGATIVE);
 416                 step = -step;
 417         } else
 418                 swim_action(base, SEEK_POSITIVE);
 419
 420         for ( ; step > 0; step--) {
 421                 if (swim_step(base))
 422                         return -1;
 423         }
 424
 425         return 0;
 426 }
 427
 428 static inline int swim_track(struct floppy_state *fs,  int track)
 429 {
 430         struct swim __iomem *base = fs->swd->base;
 431         int ret;
 432
 433         ret = swim_seek(base, track - fs->track);
 434
 435         if (ret == 0)
 436                 fs->track = track;
 437         else {
 438                 swim_track00(base);
 439                 fs->track = 0;
 440         }
 441
 442         return ret;
 443 }
 444
 445 static int floppy_eject(struct floppy_state *fs)
 446 {
 447         struct swim __iomem *base = fs->swd->base;
 448
 449         swim_drive(base, fs->location);
 450         swim_motor(base, OFF);
 451         swim_eject(base);
 452
 453         fs->disk_in = 0;
 454         fs->ejected = 1;
 455
 456         return 0;
 457 }
 458
 459 static inline int swim_read_sector(struct floppy_state *fs,
 460                                    int side, int track,
 461                                    int sector, unsigned char *buffer)
 462 {
 463         struct swim __iomem *base = fs->swd->base;
 464         unsigned long flags;
 465         struct sector_header header;
 466         int ret = -1;
 467         short i;
 468
 469         swim_track(fs, track);
 470
 471         swim_write(base, mode1, MOTON);
 472         swim_head(base, side);
 473         swim_write(base, mode0, side);
 474
 475         local_irq_save(flags);
 476         for (i = 0; i < 36; i++) {
 477                 ret = swim_read_sector_header(base, &header);
 478                 if (!ret && (header.sector == sector)) {
 479                         /* found */
 480
 481                         ret = swim_read_sector_data(base, buffer);
 482                         break;
 483                 }
 484         }
 485         local_irq_restore(flags);
 486
 487         swim_write(base, mode0, MOTON);
 488
 489         if ((header.side != side)  || (header.track != track) ||
 490              (header.sector != sector))
 491                 return 0;
 492
 493         return ret;
 494 }
 495
 496 static int floppy_read_sectors(struct floppy_state *fs,
 497                                int req_sector, int sectors_nb,
 498                                unsigned char *buffer)
 499 {
 500         struct swim __iomem *base = fs->swd->base;
 501         int ret;
 502         int side, track, sector;
 503         int i, try;
 504
 505
 506         swim_drive(base, fs->location);
 507         for (i = req_sector; i < req_sector + sectors_nb; i++) {
 508                 int x;
 509                 track = i / fs->secpercyl;
 510                 x = i % fs->secpercyl;
 511                 side = x / fs->secpertrack;
 512                 sector = x % fs->secpertrack + 1;
 513
 514                 try = 5;
 515                 do {
 516                         ret = swim_read_sector(fs, side, track, sector,
 517                                                 buffer);
 518                         if (try-- == 0)
 519                                 return -EIO;
 520                 } while (ret != 512);
 521
 522                 buffer += ret;
 523         }
 524
 525         return 0;
 526 }
 527
 528 static void redo_fd_request(struct request_queue *q)
 529 {
 530         struct request *req;
 531         struct floppy_state *fs;
 532
 533         req = blk_fetch_request(q);
 534         while (req) {
 535                 int err = -EIO;
 536
 537                 fs = req->rq_disk->private_data;
 538                 if (blk_rq_pos(req) >= fs->total_secs)
 539                         goto done;
 540                 if (!fs->disk_in)
 541                         goto done;
 542                 if (rq_data_dir(req) == WRITE && fs->write_protected)
 543                         goto done;
 544
 545                 switch (rq_data_dir(req)) {
 546                 case WRITE:
 547                         /* NOT IMPLEMENTED */
 548                         break;
 549                 case READ:
 550                         err = floppy_read_sectors(fs, blk_rq_pos(req),
 551                                                   blk_rq_cur_sectors(req),
 552                                                   req->buffer);
 553                         break;
 554                 }
 555         done:
 556                 if (!__blk_end_request_cur(req, err))
 557                         req = blk_fetch_request(q);
 558         }
 559 }
 560
 561 static void do_fd_request(struct request_queue *q)
 562 {
 563         redo_fd_request(q);
 564 }
 565
 566 static struct floppy_struct floppy_type[4] = {
 567         {    0,  0, 0,  0, 0, 0x00, 0x00, 0x00, 0x00, NULL }, /* no testing   */
 568         {  720,  9, 1, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 360KB SS 3.5"*/
 569         { 1440,  9, 2, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 720KB 3.5"   */
 570         { 2880, 18, 2, 80, 0, 0x1B, 0x00, 0xCF, 0x6C, NULL }, /* 1.44MB 3.5"  */
 571 };
 572
 573 static int get_floppy_geometry(struct floppy_state *fs, int type,
 574                                struct floppy_struct **g)
 575 {
 576         if (type >= ARRAY_SIZE(floppy_type))
 577                 return -EINVAL;
 578
 579         if (type)
 580                 *g = &floppy_type[type];
 581         else if (fs->type == HD_MEDIA) /* High-Density media */
 582                 *g = &floppy_type[3];
 583         else if (fs->head_number == 2) /* double-sided */
 584                 *g = &floppy_type[2];
 585         else
 586                 *g = &floppy_type[1];
 587
 588         return 0;
 589 }
 590
 591 static void setup_medium(struct floppy_state *fs)
 592 {
 593         struct swim __iomem *base = fs->swd->base;
 594
 595         if (swim_readbit(base, DISK_IN)) {
 596                 struct floppy_struct *g;
 597                 fs->disk_in = 1;
 598                 fs->write_protected = swim_readbit(base, WRITE_PROT);
 599                 fs->type = swim_readbit(base, ONEMEG_MEDIA);
 600
 601                 if (swim_track00(base))
 602                         printk(KERN_ERR
 603                                 "SWIM: cannot move floppy head to track 0\n");
 604
 605                 swim_track00(base);
 606
 607                 get_floppy_geometry(fs, 0, &g);
 608                 fs->total_secs = g->size;
 609                 fs->secpercyl = g->head * g->sect;
 610                 fs->secpertrack = g->sect;
 611                 fs->track = 0;
 612         } else {
 613                 fs->disk_in = 0;
 614         }
 615 }
 616
 617 static int floppy_open(struct block_device *bdev, fmode_t mode)
 618 {
 619         struct floppy_state *fs = bdev->bd_disk->private_data;
 620         struct swim __iomem *base = fs->swd->base;
 621         int err;
 622
 623         if (fs->ref_count == -1 || (fs->ref_count && mode & FMODE_EXCL))
 624                 return -EBUSY;
 625
 626         if (mode & FMODE_EXCL)
 627                 fs->ref_count = -1;
 628         else
 629                 fs->ref_count++;
 630
 631         swim_write(base, setup, S_IBM_DRIVE  | S_FCLK_DIV2);
 632         udelay(10);
 633         swim_drive(base, INTERNAL_DRIVE);
 634         swim_motor(base, ON);
 635         swim_action(base, SETMFM);
 636         if (fs->ejected)
 637                 setup_medium(fs);
 638         if (!fs->disk_in) {
 639                 err = -ENXIO;
 640                 goto out;
 641         }
 642
 643         if (mode & FMODE_NDELAY)
 644                 return 0;
 645
 646         if (mode & (FMODE_READ|FMODE_WRITE)) {
 647                 check_disk_change(bdev);
 648                 if ((mode & FMODE_WRITE) && fs->write_protected) {
 649                         err = -EROFS;
 650                         goto out;
 651                 }
 652         }
 653         return 0;
 654 out:
 655         if (fs->ref_count < 0)
 656                 fs->ref_count = 0;
 657         else if (fs->ref_count > 0)
 658                 --fs->ref_count;
 659
 660         if (fs->ref_count == 0)
 661                 swim_motor(base, OFF);
 662         return err;
 663 }
 664
 665 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
 666 {
 667         int ret;
 668
 669         mutex_lock(&swim_mutex);
 670         ret = floppy_open(bdev, mode);
 671         mutex_unlock(&swim_mutex);
 672
 673         return ret;
 674 }
 675
 676 static void floppy_release(struct gendisk *disk, fmode_t mode)
 677 {
 678         struct floppy_state *fs = disk->private_data;
 679         struct swim __iomem *base = fs->swd->base;
 680
 681         mutex_lock(&swim_mutex);
 682         if (fs->ref_count < 0)
 683                 fs->ref_count = 0;
 684         else if (fs->ref_count > 0)
 685                 --fs->ref_count;
 686
 687         if (fs->ref_count == 0)
 688                 swim_motor(base, OFF);
 689         mutex_unlock(&swim_mutex);
 690 }
 691
 692 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
 693                         unsigned int cmd, unsigned long param)
 694 {
 695         struct floppy_state *fs = bdev->bd_disk->private_data;
 696         int err;
 697
 698         if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
 699                         return -EPERM;
 700
 701         switch (cmd) {
 702         case FDEJECT:
 703                 if (fs->ref_count != 1)
 704                         return -EBUSY;
 705                 mutex_lock(&swim_mutex);
 706                 err = floppy_eject(fs);
 707                 mutex_unlock(&swim_mutex);
 708                 return err;
 709
 710         case FDGETPRM:
 711                 if (copy_to_user((void __user *) param, (void *) &floppy_type,
 712                                  sizeof(struct floppy_struct)))
 713                         return -EFAULT;
 714                 break;
 715
 716         default:
 717                 printk(KERN_DEBUG "SWIM floppy_ioctl: unknown cmd %d\n",
 718                        cmd);
 719                 return -ENOSYS;
 720         }
 721         return 0;
 722 }
 723
 724 static int floppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 725 {
 726         struct floppy_state *fs = bdev->bd_disk->private_data;
 727         struct floppy_struct *g;
 728         int ret;
 729
 730         ret = get_floppy_geometry(fs, 0, &g);
 731         if (ret)
 732                 return ret;
 733
 734         geo->heads = g->head;
 735         geo->sectors = g->sect;
 736         geo->cylinders = g->track;
 737
 738         return 0;
 739 }
 740
 741 static unsigned int floppy_check_events(struct gendisk *disk,
 742                                         unsigned int clearing)
 743 {
 744         struct floppy_state *fs = disk->private_data;
 745
 746         return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0;
 747 }
 748
 749 static int floppy_revalidate(struct gendisk *disk)
 750 {
 751         struct floppy_state *fs = disk->private_data;
 752         struct swim __iomem *base = fs->swd->base;
 753
 754         swim_drive(base, fs->location);
 755
 756         if (fs->ejected)
 757                 setup_medium(fs);
 758
 759         if (!fs->disk_in)
 760                 swim_motor(base, OFF);
 761         else
 762                 fs->ejected = 0;
 763
 764         return !fs->disk_in;
 765 }
 766
 767 static const struct block_device_operations floppy_fops = {
 768         .owner           = THIS_MODULE,
 769         .open            = floppy_unlocked_open,
 770         .release         = floppy_release,
 771         .ioctl           = floppy_ioctl,
 772         .getgeo          = floppy_getgeo,
 773         .check_events    = floppy_check_events,
 774         .revalidate_disk = floppy_revalidate,
 775 };
 776
 777 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
 778 {
 779         struct swim_priv *swd = data;
 780         int drive = (*part & 3);
 781
 782         if (drive > swd->floppy_count)
 783                 return NULL;
 784
 785         *part = 0;
 786         return get_disk(swd->unit[drive].disk);
 787 }
 788
 789 static int swim_add_floppy(struct swim_priv *swd, enum drive_location location)
 790 {
 791         struct floppy_state *fs = &swd->unit[swd->floppy_count];
 792         struct swim __iomem *base = swd->base;
 793
 794         fs->location = location;
 795
 796         swim_drive(base, location);
 797
 798         swim_motor(base, OFF);
 799
 800         if (swim_readbit(base, SINGLE_SIDED))
 801                 fs->head_number = 1;
 802         else
 803                 fs->head_number = 2;
 804         fs->ref_count = 0;
 805         fs->ejected = 1;
 806
 807         swd->floppy_count++;
 808
 809         return 0;
 810 }
 811
 812 static int swim_floppy_init(struct swim_priv *swd)
 813 {
 814         int err;
 815         int drive;
 816         struct swim __iomem *base = swd->base;
 817
 818         /* scan floppy drives */
 819
 820         swim_drive(base, INTERNAL_DRIVE);
 821         if (swim_readbit(base, DRIVE_PRESENT))
 822                 swim_add_floppy(swd, INTERNAL_DRIVE);
 823         swim_drive(base, EXTERNAL_DRIVE);
 824         if (swim_readbit(base, DRIVE_PRESENT))
 825                 swim_add_floppy(swd, EXTERNAL_DRIVE);
 826
 827         /* register floppy drives */
 828
 829         err = register_blkdev(FLOPPY_MAJOR, "fd");
 830         if (err) {
 831                 printk(KERN_ERR "Unable to get major %d for SWIM floppy\n",
 832                        FLOPPY_MAJOR);
 833                 return -EBUSY;
 834         }
 835
 836         for (drive = 0; drive < swd->floppy_count; drive++) {
 837                 swd->unit[drive].disk = alloc_disk(1);
 838                 if (swd->unit[drive].disk == NULL) {
 839                         err = -ENOMEM;
 840                         goto exit_put_disks;
 841                 }
 842                 swd->unit[drive].swd = swd;
 843         }
 844
 845         spin_lock_init(&swd->lock);
 846         swd->queue = blk_init_queue(do_fd_request, &swd->lock);
 847         if (!swd->queue) {
 848                 err = -ENOMEM;
 849                 goto exit_put_disks;
 850         }
 851
 852         for (drive = 0; drive < swd->floppy_count; drive++) {
 853                 swd->unit[drive].disk->flags = GENHD_FL_REMOVABLE;
 854                 swd->unit[drive].disk->major = FLOPPY_MAJOR;
 855                 swd->unit[drive].disk->first_minor = drive;
 856                 sprintf(swd->unit[drive].disk->disk_name, "fd%d", drive);
 857                 swd->unit[drive].disk->fops = &floppy_fops;
 858                 swd->unit[drive].disk->private_data = &swd->unit[drive];
 859                 swd->unit[drive].disk->queue = swd->queue;
 860                 set_capacity(swd->unit[drive].disk, 2880);
 861                 add_disk(swd->unit[drive].disk);
 862         }
 863
 864         blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
 865                             floppy_find, NULL, swd);
 866
 867         return 0;
 868
 869 exit_put_disks:
 870         unregister_blkdev(FLOPPY_MAJOR, "fd");
 871         while (drive--)
 872                 put_disk(swd->unit[drive].disk);
 873         return err;
 874 }
 875
 876 static int swim_probe(struct platform_device *dev)
 877 {
 878         struct resource *res;
 879         struct swim __iomem *swim_base;
 880         struct swim_priv *swd;
 881         int ret;
 882
 883         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 884         if (!res) {
 885                 ret = -ENODEV;
 886                 goto out;
 887         }
 888
 889         if (!request_mem_region(res->start, resource_size(res), CARDNAME)) {
 890                 ret = -EBUSY;
 891                 goto out;
 892         }
 893
 894         swim_base = ioremap(res->start, resource_size(res));
 895         if (!swim_base) {
 896                 return -ENOMEM;
 897                 goto out_release_io;
 898         }
 899
 900         /* probe device */
 901
 902         set_swim_mode(swim_base, 1);
 903         if (!get_swim_mode(swim_base)) {
 904                 printk(KERN_INFO "SWIM device not found !\n");
 905                 ret = -ENODEV;
 906                 goto out_iounmap;
 907         }
 908
 909         /* set platform driver data */
 910
 911         swd = kzalloc(sizeof(struct swim_priv), GFP_KERNEL);
 912         if (!swd) {
 913                 ret = -ENOMEM;
 914                 goto out_iounmap;
 915         }
 916         platform_set_drvdata(dev, swd);
 917
 918         swd->base = swim_base;
 919
 920         ret = swim_floppy_init(swd);
 921         if (ret)
 922                 goto out_kfree;
 923
 924         return 0;
 925
 926 out_kfree:
 927         platform_set_drvdata(dev, NULL);
 928         kfree(swd);
 929 out_iounmap:
 930         iounmap(swim_base);
 931 out_release_io:
 932         release_mem_region(res->start, resource_size(res));
 933 out:
 934         return ret;
 935 }
 936
 937 static int swim_remove(struct platform_device *dev)
 938 {
 939         struct swim_priv *swd = platform_get_drvdata(dev);
 940         int drive;
 941         struct resource *res;
 942
 943         blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
 944
 945         for (drive = 0; drive < swd->floppy_count; drive++) {
 946                 del_gendisk(swd->unit[drive].disk);
 947                 put_disk(swd->unit[drive].disk);
 948         }
 949
 950         unregister_blkdev(FLOPPY_MAJOR, "fd");
 951
 952         blk_cleanup_queue(swd->queue);
 953
 954         /* eject floppies */
 955
 956         for (drive = 0; drive < swd->floppy_count; drive++)
 957                 floppy_eject(&swd->unit[drive]);
 958
 959         iounmap(swd->base);
 960
 961         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 962         if (res)
 963                 release_mem_region(res->start, resource_size(res));
 964
 965         platform_set_drvdata(dev, NULL);
 966         kfree(swd);
 967
 968         return 0;
 969 }
 970
 971 static struct platform_driver swim_driver = {
 972         .probe  = swim_probe,
 973         .remove = swim_remove,
 974         .driver   = {
 975                 .name   = CARDNAME,
 976                 .owner  = THIS_MODULE,
 977         },
 978 };
 979
 980 static int __init swim_init(void)
 981 {
 982         printk(KERN_INFO "SWIM floppy driver %s\n", DRIVER_VERSION);
 983
 984         return platform_driver_register(&swim_driver);
 985 }
 986 module_init(swim_init);
 987
 988 static void __exit swim_exit(void)
 989 {
 990         platform_driver_unregister(&swim_driver);
 991 }
 992 module_exit(swim_exit);
 993
 994 MODULE_DESCRIPTION("Driver for SWIM floppy controller");
 995 MODULE_LICENSE("GPL");
 996 MODULE_AUTHOR("Laurent Vivier <laurent@lvivier.info>");
 997 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);