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