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/blk-mq.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 ONEMEG_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 GCR_MODE        0x175
 122 #define SEEK_COMPLETE   0x176
 123 #define TWOMEG_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         struct blk_mq_tag_set tag_set;
 194
 195         /* parent controller */
 196
 197         struct swim_priv *swd;
 198 };
 199
 200 enum motor_action {
 201         OFF,
 202         ON,
 203 };
 204
 205 enum head {
 206         LOWER_HEAD = 0,
 207         UPPER_HEAD = 1,
 208 };
 209
 210 #define FD_MAX_UNIT     2
 211
 212 struct swim_priv {
 213         struct swim __iomem *base;
 214         spinlock_t lock;
 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 blk_status_t 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 BLK_STS_IOERR;
 520                 } while (ret != 512);
 521
 522                 buffer += ret;
 523         }
 524
 525         return 0;
 526 }
 527
 528 static blk_status_t swim_queue_rq(struct blk_mq_hw_ctx *hctx,
 529                                   const struct blk_mq_queue_data *bd)
 530 {
 531         struct floppy_state *fs = hctx->queue->queuedata;
 532         struct swim_priv *swd = fs->swd;
 533         struct request *req = bd->rq;
 534         blk_status_t err;
 535
 536         if (!spin_trylock_irq(&swd->lock))
 537                 return BLK_STS_DEV_RESOURCE;
 538
 539         blk_mq_start_request(req);
 540
 541         if (!fs->disk_in || rq_data_dir(req) == WRITE) {
 542                 err = BLK_STS_IOERR;
 543                 goto out;
 544         }
 545
 546         do {
 547                 err = floppy_read_sectors(fs, blk_rq_pos(req),
 548                                           blk_rq_cur_sectors(req),
 549                                           bio_data(req->bio));
 550         } while (blk_update_request(req, err, blk_rq_cur_bytes(req)));
 551         __blk_mq_end_request(req, err);
 552
 553         err = BLK_STS_OK;
 554 out:
 555         spin_unlock_irq(&swd->lock);
 556         return err;
 557
 558 }
 559
 560 static struct floppy_struct floppy_type[4] = {
 561         {    0,  0, 0,  0, 0, 0x00, 0x00, 0x00, 0x00, NULL }, /* no testing   */
 562         {  720,  9, 1, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 360KB SS 3.5"*/
 563         { 1440,  9, 2, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 720KB 3.5"   */
 564         { 2880, 18, 2, 80, 0, 0x1B, 0x00, 0xCF, 0x6C, NULL }, /* 1.44MB 3.5"  */
 565 };
 566
 567 static int get_floppy_geometry(struct floppy_state *fs, int type,
 568                                struct floppy_struct **g)
 569 {
 570         if (type >= ARRAY_SIZE(floppy_type))
 571                 return -EINVAL;
 572
 573         if (type)
 574                 *g = &floppy_type[type];
 575         else if (fs->type == HD_MEDIA) /* High-Density media */
 576                 *g = &floppy_type[3];
 577         else if (fs->head_number == 2) /* double-sided */
 578                 *g = &floppy_type[2];
 579         else
 580                 *g = &floppy_type[1];
 581
 582         return 0;
 583 }
 584
 585 static void setup_medium(struct floppy_state *fs)
 586 {
 587         struct swim __iomem *base = fs->swd->base;
 588
 589         if (swim_readbit(base, DISK_IN)) {
 590                 struct floppy_struct *g;
 591                 fs->disk_in = 1;
 592                 fs->write_protected = swim_readbit(base, WRITE_PROT);
 593
 594                 if (swim_track00(base))
 595                         printk(KERN_ERR
 596                                 "SWIM: cannot move floppy head to track 0\n");
 597
 598                 swim_track00(base);
 599
 600                 fs->type = swim_readbit(base, TWOMEG_MEDIA) ?
 601                         HD_MEDIA : DD_MEDIA;
 602                 fs->head_number = swim_readbit(base, SINGLE_SIDED) ? 1 : 2;
 603                 get_floppy_geometry(fs, 0, &g);
 604                 fs->total_secs = g->size;
 605                 fs->secpercyl = g->head * g->sect;
 606                 fs->secpertrack = g->sect;
 607                 fs->track = 0;
 608         } else {
 609                 fs->disk_in = 0;
 610         }
 611 }
 612
 613 static int floppy_open(struct block_device *bdev, fmode_t mode)
 614 {
 615         struct floppy_state *fs = bdev->bd_disk->private_data;
 616         struct swim __iomem *base = fs->swd->base;
 617         int err;
 618
 619         if (fs->ref_count == -1 || (fs->ref_count && mode & FMODE_EXCL))
 620                 return -EBUSY;
 621
 622         if (mode & FMODE_EXCL)
 623                 fs->ref_count = -1;
 624         else
 625                 fs->ref_count++;
 626
 627         swim_write(base, setup, S_IBM_DRIVE  | S_FCLK_DIV2);
 628         udelay(10);
 629         swim_drive(base, fs->location);
 630         swim_motor(base, ON);
 631         swim_action(base, SETMFM);
 632         if (fs->ejected)
 633                 setup_medium(fs);
 634         if (!fs->disk_in) {
 635                 err = -ENXIO;
 636                 goto out;
 637         }
 638
 639         set_capacity(fs->disk, fs->total_secs);
 640
 641         if (mode & FMODE_NDELAY)
 642                 return 0;
 643
 644         if (mode & (FMODE_READ|FMODE_WRITE)) {
 645                 check_disk_change(bdev);
 646                 if ((mode & FMODE_WRITE) && fs->write_protected) {
 647                         err = -EROFS;
 648                         goto out;
 649                 }
 650         }
 651         return 0;
 652 out:
 653         if (fs->ref_count < 0)
 654                 fs->ref_count = 0;
 655         else if (fs->ref_count > 0)
 656                 --fs->ref_count;
 657
 658         if (fs->ref_count == 0)
 659                 swim_motor(base, OFF);
 660         return err;
 661 }
 662
 663 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
 664 {
 665         int ret;
 666
 667         mutex_lock(&swim_mutex);
 668         ret = floppy_open(bdev, mode);
 669         mutex_unlock(&swim_mutex);
 670
 671         return ret;
 672 }
 673
 674 static void floppy_release(struct gendisk *disk, fmode_t mode)
 675 {
 676         struct floppy_state *fs = disk->private_data;
 677         struct swim __iomem *base = fs->swd->base;
 678
 679         mutex_lock(&swim_mutex);
 680         if (fs->ref_count < 0)
 681                 fs->ref_count = 0;
 682         else if (fs->ref_count > 0)
 683                 --fs->ref_count;
 684
 685         if (fs->ref_count == 0)
 686                 swim_motor(base, OFF);
 687         mutex_unlock(&swim_mutex);
 688 }
 689
 690 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
 691                         unsigned int cmd, unsigned long param)
 692 {
 693         struct floppy_state *fs = bdev->bd_disk->private_data;
 694         int err;
 695
 696         if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
 697                         return -EPERM;
 698
 699         switch (cmd) {
 700         case FDEJECT:
 701                 if (fs->ref_count != 1)
 702                         return -EBUSY;
 703                 mutex_lock(&swim_mutex);
 704                 err = floppy_eject(fs);
 705                 mutex_unlock(&swim_mutex);
 706                 return err;
 707
 708         case FDGETPRM:
 709                 if (copy_to_user((void __user *) param, (void *) &floppy_type,
 710                                  sizeof(struct floppy_struct)))
 711                         return -EFAULT;
 712                 return 0;
 713         }
 714         return -ENOTTY;
 715 }
 716
 717 static int floppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 718 {
 719         struct floppy_state *fs = bdev->bd_disk->private_data;
 720         struct floppy_struct *g;
 721         int ret;
 722
 723         ret = get_floppy_geometry(fs, 0, &g);
 724         if (ret)
 725                 return ret;
 726
 727         geo->heads = g->head;
 728         geo->sectors = g->sect;
 729         geo->cylinders = g->track;
 730
 731         return 0;
 732 }
 733
 734 static unsigned int floppy_check_events(struct gendisk *disk,
 735                                         unsigned int clearing)
 736 {
 737         struct floppy_state *fs = disk->private_data;
 738
 739         return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0;
 740 }
 741
 742 static int floppy_revalidate(struct gendisk *disk)
 743 {
 744         struct floppy_state *fs = disk->private_data;
 745         struct swim __iomem *base = fs->swd->base;
 746
 747         swim_drive(base, fs->location);
 748
 749         if (fs->ejected)
 750                 setup_medium(fs);
 751
 752         if (!fs->disk_in)
 753                 swim_motor(base, OFF);
 754         else
 755                 fs->ejected = 0;
 756
 757         return !fs->disk_in;
 758 }
 759
 760 static const struct block_device_operations floppy_fops = {
 761         .owner           = THIS_MODULE,
 762         .open            = floppy_unlocked_open,
 763         .release         = floppy_release,
 764         .ioctl           = floppy_ioctl,
 765         .getgeo          = floppy_getgeo,
 766         .check_events    = floppy_check_events,
 767         .revalidate_disk = floppy_revalidate,
 768 };
 769
 770 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
 771 {
 772         struct swim_priv *swd = data;
 773         int drive = (*part & 3);
 774
 775         if (drive >= swd->floppy_count)
 776                 return NULL;
 777
 778         *part = 0;
 779         return get_disk_and_module(swd->unit[drive].disk);
 780 }
 781
 782 static int swim_add_floppy(struct swim_priv *swd, enum drive_location location)
 783 {
 784         struct floppy_state *fs = &swd->unit[swd->floppy_count];
 785         struct swim __iomem *base = swd->base;
 786
 787         fs->location = location;
 788
 789         swim_drive(base, location);
 790
 791         swim_motor(base, OFF);
 792
 793         fs->type = HD_MEDIA;
 794         fs->head_number = 2;
 795
 796         fs->ref_count = 0;
 797         fs->ejected = 1;
 798
 799         swd->floppy_count++;
 800
 801         return 0;
 802 }
 803
 804 static const struct blk_mq_ops swim_mq_ops = {
 805         .queue_rq = swim_queue_rq,
 806 };
 807
 808 static int swim_floppy_init(struct swim_priv *swd)
 809 {
 810         int err;
 811         int drive;
 812         struct swim __iomem *base = swd->base;
 813
 814         /* scan floppy drives */
 815
 816         swim_drive(base, INTERNAL_DRIVE);
 817         if (swim_readbit(base, DRIVE_PRESENT) &&
 818             !swim_readbit(base, ONEMEG_DRIVE))
 819                 swim_add_floppy(swd, INTERNAL_DRIVE);
 820         swim_drive(base, EXTERNAL_DRIVE);
 821         if (swim_readbit(base, DRIVE_PRESENT) &&
 822             !swim_readbit(base, ONEMEG_DRIVE))
 823                 swim_add_floppy(swd, EXTERNAL_DRIVE);
 824
 825         /* register floppy drives */
 826
 827         err = register_blkdev(FLOPPY_MAJOR, "fd");
 828         if (err) {
 829                 printk(KERN_ERR "Unable to get major %d for SWIM floppy\n",
 830                        FLOPPY_MAJOR);
 831                 return -EBUSY;
 832         }
 833
 834         spin_lock_init(&swd->lock);
 835
 836         for (drive = 0; drive < swd->floppy_count; drive++) {
 837                 struct request_queue *q;
 838
 839                 swd->unit[drive].disk = alloc_disk(1);
 840                 if (swd->unit[drive].disk == NULL) {
 841                         err = -ENOMEM;
 842                         goto exit_put_disks;
 843                 }
 844
 845                 q = blk_mq_init_sq_queue(&swd->unit[drive].tag_set, &swim_mq_ops,
 846                                                 2, BLK_MQ_F_SHOULD_MERGE);
 847                 if (IS_ERR(q)) {
 848                         err = PTR_ERR(q);
 849                         goto exit_put_disks;
 850                 }
 851
 852                 swd->unit[drive].disk->queue = q;
 853                 blk_queue_bounce_limit(swd->unit[drive].disk->queue,
 854                                 BLK_BOUNCE_HIGH);
 855                 swd->unit[drive].disk->queue->queuedata = &swd->unit[drive];
 856                 swd->unit[drive].swd = swd;
 857         }
 858
 859         for (drive = 0; drive < swd->floppy_count; drive++) {
 860                 swd->unit[drive].disk->flags = GENHD_FL_REMOVABLE;
 861                 swd->unit[drive].disk->major = FLOPPY_MAJOR;
 862                 swd->unit[drive].disk->first_minor = drive;
 863                 sprintf(swd->unit[drive].disk->disk_name, "fd%d", drive);
 864                 swd->unit[drive].disk->fops = &floppy_fops;
 865                 swd->unit[drive].disk->private_data = &swd->unit[drive];
 866                 set_capacity(swd->unit[drive].disk, 2880);
 867                 add_disk(swd->unit[drive].disk);
 868         }
 869
 870         blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
 871                             floppy_find, NULL, swd);
 872
 873         return 0;
 874
 875 exit_put_disks:
 876         unregister_blkdev(FLOPPY_MAJOR, "fd");
 877         do {
 878                 struct gendisk *disk = swd->unit[drive].disk;
 879
 880                 if (disk) {
 881                         if (disk->queue) {
 882                                 blk_cleanup_queue(disk->queue);
 883                                 disk->queue = NULL;
 884                         }
 885                         blk_mq_free_tag_set(&swd->unit[drive].tag_set);
 886                         put_disk(disk);
 887                 }
 888         } while (drive--);
 889         return err;
 890 }
 891
 892 static int swim_probe(struct platform_device *dev)
 893 {
 894         struct resource *res;
 895         struct swim __iomem *swim_base;
 896         struct swim_priv *swd;
 897         int ret;
 898
 899         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 900         if (!res) {
 901                 ret = -ENODEV;
 902                 goto out;
 903         }
 904
 905         if (!request_mem_region(res->start, resource_size(res), CARDNAME)) {
 906                 ret = -EBUSY;
 907                 goto out;
 908         }
 909
 910         swim_base = (struct swim __iomem *)res->start;
 911         if (!swim_base) {
 912                 ret = -ENOMEM;
 913                 goto out_release_io;
 914         }
 915
 916         /* probe device */
 917
 918         set_swim_mode(swim_base, 1);
 919         if (!get_swim_mode(swim_base)) {
 920                 printk(KERN_INFO "SWIM device not found !\n");
 921                 ret = -ENODEV;
 922                 goto out_release_io;
 923         }
 924
 925         /* set platform driver data */
 926
 927         swd = kzalloc(sizeof(struct swim_priv), GFP_KERNEL);
 928         if (!swd) {
 929                 ret = -ENOMEM;
 930                 goto out_release_io;
 931         }
 932         platform_set_drvdata(dev, swd);
 933
 934         swd->base = swim_base;
 935
 936         ret = swim_floppy_init(swd);
 937         if (ret)
 938                 goto out_kfree;
 939
 940         return 0;
 941
 942 out_kfree:
 943         kfree(swd);
 944 out_release_io:
 945         release_mem_region(res->start, resource_size(res));
 946 out:
 947         return ret;
 948 }
 949
 950 static int swim_remove(struct platform_device *dev)
 951 {
 952         struct swim_priv *swd = platform_get_drvdata(dev);
 953         int drive;
 954         struct resource *res;
 955
 956         blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
 957
 958         for (drive = 0; drive < swd->floppy_count; drive++) {
 959                 del_gendisk(swd->unit[drive].disk);
 960                 blk_cleanup_queue(swd->unit[drive].disk->queue);
 961                 blk_mq_free_tag_set(&swd->unit[drive].tag_set);
 962                 put_disk(swd->unit[drive].disk);
 963         }
 964
 965         unregister_blkdev(FLOPPY_MAJOR, "fd");
 966
 967         /* eject floppies */
 968
 969         for (drive = 0; drive < swd->floppy_count; drive++)
 970                 floppy_eject(&swd->unit[drive]);
 971
 972         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 973         if (res)
 974                 release_mem_region(res->start, resource_size(res));
 975
 976         kfree(swd);
 977
 978         return 0;
 979 }
 980
 981 static struct platform_driver swim_driver = {
 982         .probe  = swim_probe,
 983         .remove = swim_remove,
 984         .driver   = {
 985                 .name   = CARDNAME,
 986         },
 987 };
 988
 989 static int __init swim_init(void)
 990 {
 991         printk(KERN_INFO "SWIM floppy driver %s\n", DRIVER_VERSION);
 992
 993         return platform_driver_register(&swim_driver);
 994 }
 995 module_init(swim_init);
 996
 997 static void __exit swim_exit(void)
 998 {
 999         platform_driver_unregister(&swim_driver);
1000 }
1001 module_exit(swim_exit);
1002
1003 MODULE_DESCRIPTION("Driver for SWIM floppy controller");
1004 MODULE_LICENSE("GPL");
1005 MODULE_AUTHOR("Laurent Vivier <laurent@lvivier.info>");
1006 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);