drivers/block/swim.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Driver for SWIM (Sander Woz Integrated Machine) floppy controller
   4  *
   5  * Copyright (C) 2004,2008 Laurent Vivier <Laurent@lvivier.info>
   6  *
   7  * based on Alastair Bridgewater SWIM analysis, 2001
   8  * based on SWIM3 driver (c) Paul Mackerras, 1996
   9  * based on netBSD IWM driver (c) 1997, 1998 Hauke Fath.
  10  *
  11  * 2004-08-21 (lv) - Initial implementation
  12  * 2008-10-30 (lv) - Port to 2.6
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/fd.h>
  17 #include <linux/slab.h>
  18 #include <linux/blk-mq.h>
  19 #include <linux/major.h>
  20 #include <linux/mutex.h>
  21 #include <linux/hdreg.h>
  22 #include <linux/kernel.h>
  23 #include <linux/delay.h>
  24 #include <linux/platform_device.h>
  25
  26 #include <asm/mac_via.h>
  27
  28 #define CARDNAME "swim"
  29
  30 struct sector_header {
  31         unsigned char side;
  32         unsigned char track;
  33         unsigned char sector;
  34         unsigned char size;
  35         unsigned char crc0;
  36         unsigned char crc1;
  37 } __attribute__((packed));
  38
  39 #define DRIVER_VERSION "Version 0.2 (2008-10-30)"
  40
  41 #define REG(x)  unsigned char x, x ## _pad[0x200 - 1];
  42
  43 struct swim {
  44         REG(write_data)
  45         REG(write_mark)
  46         REG(write_CRC)
  47         REG(write_parameter)
  48         REG(write_phase)
  49         REG(write_setup)
  50         REG(write_mode0)
  51         REG(write_mode1)
  52
  53         REG(read_data)
  54         REG(read_mark)
  55         REG(read_error)
  56         REG(read_parameter)
  57         REG(read_phase)
  58         REG(read_setup)
  59         REG(read_status)
  60         REG(read_handshake)
  61 } __attribute__((packed));
  62
  63 #define swim_write(base, reg, v)        out_8(&(base)->write_##reg, (v))
  64 #define swim_read(base, reg)            in_8(&(base)->read_##reg)
  65
  66 /* IWM registers */
  67
  68 struct iwm {
  69         REG(ph0L)
  70         REG(ph0H)
  71         REG(ph1L)
  72         REG(ph1H)
  73         REG(ph2L)
  74         REG(ph2H)
  75         REG(ph3L)
  76         REG(ph3H)
  77         REG(mtrOff)
  78         REG(mtrOn)
  79         REG(intDrive)
  80         REG(extDrive)
  81         REG(q6L)
  82         REG(q6H)
  83         REG(q7L)
  84         REG(q7H)
  85 } __attribute__((packed));
  86
  87 #define iwm_write(base, reg, v)         out_8(&(base)->reg, (v))
  88 #define iwm_read(base, reg)             in_8(&(base)->reg)
  89
  90 /* bits in phase register */
  91
  92 #define SEEK_POSITIVE   0x070
  93 #define SEEK_NEGATIVE   0x074
  94 #define STEP            0x071
  95 #define MOTOR_ON        0x072
  96 #define MOTOR_OFF       0x076
  97 #define INDEX           0x073
  98 #define EJECT           0x077
  99 #define SETMFM          0x171
 100 #define SETGCR          0x175
 101
 102 #define RELAX           0x033
 103 #define LSTRB           0x008
 104
 105 #define CA_MASK         0x077
 106
 107 /* Select values for swim_select and swim_readbit */
 108
 109 #define READ_DATA_0     0x074
 110 #define ONEMEG_DRIVE    0x075
 111 #define SINGLE_SIDED    0x076
 112 #define DRIVE_PRESENT   0x077
 113 #define DISK_IN         0x170
 114 #define WRITE_PROT      0x171
 115 #define TRACK_ZERO      0x172
 116 #define TACHO           0x173
 117 #define READ_DATA_1     0x174
 118 #define GCR_MODE        0x175
 119 #define SEEK_COMPLETE   0x176
 120 #define TWOMEG_MEDIA    0x177
 121
 122 /* Bits in handshake register */
 123
 124 #define MARK_BYTE       0x01
 125 #define CRC_ZERO        0x02
 126 #define RDDATA          0x04
 127 #define SENSE           0x08
 128 #define MOTEN           0x10
 129 #define ERROR           0x20
 130 #define DAT2BYTE        0x40
 131 #define DAT1BYTE        0x80
 132
 133 /* bits in setup register */
 134
 135 #define S_INV_WDATA     0x01
 136 #define S_3_5_SELECT    0x02
 137 #define S_GCR           0x04
 138 #define S_FCLK_DIV2     0x08
 139 #define S_ERROR_CORR    0x10
 140 #define S_IBM_DRIVE     0x20
 141 #define S_GCR_WRITE     0x40
 142 #define S_TIMEOUT       0x80
 143
 144 /* bits in mode register */
 145
 146 #define CLFIFO          0x01
 147 #define ENBL1           0x02
 148 #define ENBL2           0x04
 149 #define ACTION          0x08
 150 #define WRITE_MODE      0x10
 151 #define HEDSEL          0x20
 152 #define MOTON           0x80
 153
 154 /*----------------------------------------------------------------------------*/
 155
 156 enum drive_location {
 157         INTERNAL_DRIVE = 0x02,
 158         EXTERNAL_DRIVE = 0x04,
 159 };
 160
 161 enum media_type {
 162         DD_MEDIA,
 163         HD_MEDIA,
 164 };
 165
 166 struct floppy_state {
 167
 168         /* physical properties */
 169
 170         enum drive_location location;   /* internal or external drive */
 171         int              head_number;   /* single- or double-sided drive */
 172
 173         /* media */
 174
 175         int              disk_in;
 176         int              ejected;
 177         enum media_type  type;
 178         int              write_protected;
 179
 180         int              total_secs;
 181         int              secpercyl;
 182         int              secpertrack;
 183
 184         /* in-use information */
 185
 186         int             track;
 187         int             ref_count;
 188         bool registered;
 189
 190         struct gendisk *disk;
 191         struct blk_mq_tag_set tag_set;
 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         int floppy_count;
 214         struct floppy_state unit[FD_MAX_UNIT];
 215 };
 216
 217 extern int swim_read_sector_header(struct swim __iomem *base,
 218                                    struct sector_header *header);
 219 extern int swim_read_sector_data(struct swim __iomem *base,
 220                                  unsigned char *data);
 221
 222 static DEFINE_MUTEX(swim_mutex);
 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                         set_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                 set_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                 set_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 blk_status_t 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 BLK_STS_IOERR;
 518                 } while (ret != 512);
 519
 520                 buffer += ret;
 521         }
 522
 523         return 0;
 524 }
 525
 526 static blk_status_t swim_queue_rq(struct blk_mq_hw_ctx *hctx,
 527                                   const struct blk_mq_queue_data *bd)
 528 {
 529         struct floppy_state *fs = hctx->queue->queuedata;
 530         struct swim_priv *swd = fs->swd;
 531         struct request *req = bd->rq;
 532         blk_status_t err;
 533
 534         if (!spin_trylock_irq(&swd->lock))
 535                 return BLK_STS_DEV_RESOURCE;
 536
 537         blk_mq_start_request(req);
 538
 539         if (!fs->disk_in || rq_data_dir(req) == WRITE) {
 540                 err = BLK_STS_IOERR;
 541                 goto out;
 542         }
 543
 544         do {
 545                 err = floppy_read_sectors(fs, blk_rq_pos(req),
 546                                           blk_rq_cur_sectors(req),
 547                                           bio_data(req->bio));
 548         } while (blk_update_request(req, err, blk_rq_cur_bytes(req)));
 549         __blk_mq_end_request(req, err);
 550
 551         err = BLK_STS_OK;
 552 out:
 553         spin_unlock_irq(&swd->lock);
 554         return err;
 555
 556 }
 557
 558 static struct floppy_struct floppy_type[4] = {
 559         {    0,  0, 0,  0, 0, 0x00, 0x00, 0x00, 0x00, NULL }, /* no testing   */
 560         {  720,  9, 1, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 360KB SS 3.5"*/
 561         { 1440,  9, 2, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 720KB 3.5"   */
 562         { 2880, 18, 2, 80, 0, 0x1B, 0x00, 0xCF, 0x6C, NULL }, /* 1.44MB 3.5"  */
 563 };
 564
 565 static int get_floppy_geometry(struct floppy_state *fs, int type,
 566                                struct floppy_struct **g)
 567 {
 568         if (type >= ARRAY_SIZE(floppy_type))
 569                 return -EINVAL;
 570
 571         if (type)
 572                 *g = &floppy_type[type];
 573         else if (fs->type == HD_MEDIA) /* High-Density media */
 574                 *g = &floppy_type[3];
 575         else if (fs->head_number == 2) /* double-sided */
 576                 *g = &floppy_type[2];
 577         else
 578                 *g = &floppy_type[1];
 579
 580         return 0;
 581 }
 582
 583 static void setup_medium(struct floppy_state *fs)
 584 {
 585         struct swim __iomem *base = fs->swd->base;
 586
 587         if (swim_readbit(base, DISK_IN)) {
 588                 struct floppy_struct *g;
 589                 fs->disk_in = 1;
 590                 fs->write_protected = swim_readbit(base, WRITE_PROT);
 591
 592                 if (swim_track00(base))
 593                         printk(KERN_ERR
 594                                 "SWIM: cannot move floppy head to track 0\n");
 595
 596                 swim_track00(base);
 597
 598                 fs->type = swim_readbit(base, TWOMEG_MEDIA) ?
 599                         HD_MEDIA : DD_MEDIA;
 600                 fs->head_number = swim_readbit(base, SINGLE_SIDED) ? 1 : 2;
 601                 get_floppy_geometry(fs, 0, &g);
 602                 fs->total_secs = g->size;
 603                 fs->secpercyl = g->head * g->sect;
 604                 fs->secpertrack = g->sect;
 605                 fs->track = 0;
 606         } else {
 607                 fs->disk_in = 0;
 608         }
 609 }
 610
 611 static int floppy_open(struct block_device *bdev, fmode_t mode)
 612 {
 613         struct floppy_state *fs = bdev->bd_disk->private_data;
 614         struct swim __iomem *base = fs->swd->base;
 615         int err;
 616
 617         if (fs->ref_count == -1 || (fs->ref_count && mode & FMODE_EXCL))
 618                 return -EBUSY;
 619
 620         if (mode & FMODE_EXCL)
 621                 fs->ref_count = -1;
 622         else
 623                 fs->ref_count++;
 624
 625         swim_write(base, setup, S_IBM_DRIVE  | S_FCLK_DIV2);
 626         udelay(10);
 627         swim_drive(base, fs->location);
 628         swim_motor(base, ON);
 629         swim_action(base, SETMFM);
 630         if (fs->ejected)
 631                 setup_medium(fs);
 632         if (!fs->disk_in) {
 633                 err = -ENXIO;
 634                 goto out;
 635         }
 636
 637         set_capacity(fs->disk, fs->total_secs);
 638
 639         if (mode & FMODE_NDELAY)
 640                 return 0;
 641
 642         if (mode & (FMODE_READ|FMODE_WRITE)) {
 643                 if (bdev_check_media_change(bdev) && fs->disk_in)
 644                         fs->ejected = 0;
 645                 if ((mode & FMODE_WRITE) && fs->write_protected) {
 646                         err = -EROFS;
 647                         goto out;
 648                 }
 649         }
 650         return 0;
 651 out:
 652         if (fs->ref_count < 0)
 653                 fs->ref_count = 0;
 654         else if (fs->ref_count > 0)
 655                 --fs->ref_count;
 656
 657         if (fs->ref_count == 0)
 658                 swim_motor(base, OFF);
 659         return err;
 660 }
 661
 662 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
 663 {
 664         int ret;
 665
 666         mutex_lock(&swim_mutex);
 667         ret = floppy_open(bdev, mode);
 668         mutex_unlock(&swim_mutex);
 669
 670         return ret;
 671 }
 672
 673 static void floppy_release(struct gendisk *disk, fmode_t mode)
 674 {
 675         struct floppy_state *fs = disk->private_data;
 676         struct swim __iomem *base = fs->swd->base;
 677
 678         mutex_lock(&swim_mutex);
 679         if (fs->ref_count < 0)
 680                 fs->ref_count = 0;
 681         else if (fs->ref_count > 0)
 682                 --fs->ref_count;
 683
 684         if (fs->ref_count == 0)
 685                 swim_motor(base, OFF);
 686         mutex_unlock(&swim_mutex);
 687 }
 688
 689 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
 690                         unsigned int cmd, unsigned long param)
 691 {
 692         struct floppy_state *fs = bdev->bd_disk->private_data;
 693         int err;
 694
 695         if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
 696                         return -EPERM;
 697
 698         switch (cmd) {
 699         case FDEJECT:
 700                 if (fs->ref_count != 1)
 701                         return -EBUSY;
 702                 mutex_lock(&swim_mutex);
 703                 err = floppy_eject(fs);
 704                 mutex_unlock(&swim_mutex);
 705                 return err;
 706
 707         case FDGETPRM:
 708                 if (copy_to_user((void __user *) param, (void *) &floppy_type,
 709                                  sizeof(struct floppy_struct)))
 710                         return -EFAULT;
 711                 return 0;
 712         }
 713         return -ENOTTY;
 714 }
 715
 716 static int floppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 717 {
 718         struct floppy_state *fs = bdev->bd_disk->private_data;
 719         struct floppy_struct *g;
 720         int ret;
 721
 722         ret = get_floppy_geometry(fs, 0, &g);
 723         if (ret)
 724                 return ret;
 725
 726         geo->heads = g->head;
 727         geo->sectors = g->sect;
 728         geo->cylinders = g->track;
 729
 730         return 0;
 731 }
 732
 733 static unsigned int floppy_check_events(struct gendisk *disk,
 734                                         unsigned int clearing)
 735 {
 736         struct floppy_state *fs = disk->private_data;
 737
 738         return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0;
 739 }
 740
 741 static const struct block_device_operations floppy_fops = {
 742         .owner           = THIS_MODULE,
 743         .open            = floppy_unlocked_open,
 744         .release         = floppy_release,
 745         .ioctl           = floppy_ioctl,
 746         .getgeo          = floppy_getgeo,
 747         .check_events    = floppy_check_events,
 748 };
 749
 750 static int swim_add_floppy(struct swim_priv *swd, enum drive_location location)
 751 {
 752         struct floppy_state *fs = &swd->unit[swd->floppy_count];
 753         struct swim __iomem *base = swd->base;
 754
 755         fs->location = location;
 756
 757         swim_drive(base, location);
 758
 759         swim_motor(base, OFF);
 760
 761         fs->type = HD_MEDIA;
 762         fs->head_number = 2;
 763
 764         fs->ref_count = 0;
 765         fs->ejected = 1;
 766
 767         swd->floppy_count++;
 768
 769         return 0;
 770 }
 771
 772 static const struct blk_mq_ops swim_mq_ops = {
 773         .queue_rq = swim_queue_rq,
 774 };
 775
 776 static void swim_cleanup_floppy_disk(struct floppy_state *fs)
 777 {
 778         struct gendisk *disk = fs->disk;
 779
 780         if (!disk)
 781                 return;
 782
 783         if (fs->registered)
 784                 del_gendisk(fs->disk);
 785
 786         put_disk(disk);
 787         blk_mq_free_tag_set(&fs->tag_set);
 788 }
 789
 790 static int swim_floppy_init(struct swim_priv *swd)
 791 {
 792         int err;
 793         int drive;
 794         struct swim __iomem *base = swd->base;
 795
 796         /* scan floppy drives */
 797
 798         swim_drive(base, INTERNAL_DRIVE);
 799         if (swim_readbit(base, DRIVE_PRESENT) &&
 800             !swim_readbit(base, ONEMEG_DRIVE))
 801                 swim_add_floppy(swd, INTERNAL_DRIVE);
 802         swim_drive(base, EXTERNAL_DRIVE);
 803         if (swim_readbit(base, DRIVE_PRESENT) &&
 804             !swim_readbit(base, ONEMEG_DRIVE))
 805                 swim_add_floppy(swd, EXTERNAL_DRIVE);
 806
 807         /* register floppy drives */
 808
 809         err = register_blkdev(FLOPPY_MAJOR, "fd");
 810         if (err) {
 811                 printk(KERN_ERR "Unable to get major %d for SWIM floppy\n",
 812                        FLOPPY_MAJOR);
 813                 return -EBUSY;
 814         }
 815
 816         spin_lock_init(&swd->lock);
 817
 818         for (drive = 0; drive < swd->floppy_count; drive++) {
 819                 err = blk_mq_alloc_sq_tag_set(&swd->unit[drive].tag_set,
 820                                 &swim_mq_ops, 2, BLK_MQ_F_SHOULD_MERGE);
 821                 if (err)
 822                         goto exit_put_disks;
 823
 824                 swd->unit[drive].disk =
 825                         blk_mq_alloc_disk(&swd->unit[drive].tag_set,
 826                                           &swd->unit[drive]);
 827                 if (IS_ERR(swd->unit[drive].disk)) {
 828                         blk_mq_free_tag_set(&swd->unit[drive].tag_set);
 829                         err = PTR_ERR(swd->unit[drive].disk);
 830                         goto exit_put_disks;
 831                 }
 832
 833                 swd->unit[drive].swd = swd;
 834         }
 835
 836         for (drive = 0; drive < swd->floppy_count; drive++) {
 837                 swd->unit[drive].disk->flags = GENHD_FL_REMOVABLE;
 838                 swd->unit[drive].disk->major = FLOPPY_MAJOR;
 839                 swd->unit[drive].disk->first_minor = drive;
 840                 swd->unit[drive].disk->minors = 1;
 841                 sprintf(swd->unit[drive].disk->disk_name, "fd%d", drive);
 842                 swd->unit[drive].disk->fops = &floppy_fops;
 843                 swd->unit[drive].disk->flags |= GENHD_FL_NO_PART;
 844                 swd->unit[drive].disk->events = DISK_EVENT_MEDIA_CHANGE;
 845                 swd->unit[drive].disk->private_data = &swd->unit[drive];
 846                 set_capacity(swd->unit[drive].disk, 2880);
 847                 err = add_disk(swd->unit[drive].disk);
 848                 if (err)
 849                         goto exit_put_disks;
 850                 swd->unit[drive].registered = true;
 851         }
 852
 853         return 0;
 854
 855 exit_put_disks:
 856         unregister_blkdev(FLOPPY_MAJOR, "fd");
 857         do {
 858                 swim_cleanup_floppy_disk(&swd->unit[drive]);
 859         } while (drive--);
 860         return err;
 861 }
 862
 863 static int swim_probe(struct platform_device *dev)
 864 {
 865         struct resource *res;
 866         struct swim __iomem *swim_base;
 867         struct swim_priv *swd;
 868         int ret;
 869
 870         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 871         if (!res) {
 872                 ret = -ENODEV;
 873                 goto out;
 874         }
 875
 876         if (!request_mem_region(res->start, resource_size(res), CARDNAME)) {
 877                 ret = -EBUSY;
 878                 goto out;
 879         }
 880
 881         swim_base = (struct swim __iomem *)res->start;
 882         if (!swim_base) {
 883                 ret = -ENOMEM;
 884                 goto out_release_io;
 885         }
 886
 887         /* probe device */
 888
 889         set_swim_mode(swim_base, 1);
 890         if (!get_swim_mode(swim_base)) {
 891                 printk(KERN_INFO "SWIM device not found !\n");
 892                 ret = -ENODEV;
 893                 goto out_release_io;
 894         }
 895
 896         /* set platform driver data */
 897
 898         swd = kzalloc(sizeof(struct swim_priv), GFP_KERNEL);
 899         if (!swd) {
 900                 ret = -ENOMEM;
 901                 goto out_release_io;
 902         }
 903         platform_set_drvdata(dev, swd);
 904
 905         swd->base = swim_base;
 906
 907         ret = swim_floppy_init(swd);
 908         if (ret)
 909                 goto out_kfree;
 910
 911         return 0;
 912
 913 out_kfree:
 914         kfree(swd);
 915 out_release_io:
 916         release_mem_region(res->start, resource_size(res));
 917 out:
 918         return ret;
 919 }
 920
 921 static int swim_remove(struct platform_device *dev)
 922 {
 923         struct swim_priv *swd = platform_get_drvdata(dev);
 924         int drive;
 925         struct resource *res;
 926
 927         for (drive = 0; drive < swd->floppy_count; drive++)
 928                 swim_cleanup_floppy_disk(&swd->unit[drive]);
 929
 930         unregister_blkdev(FLOPPY_MAJOR, "fd");
 931
 932         /* eject floppies */
 933
 934         for (drive = 0; drive < swd->floppy_count; drive++)
 935                 floppy_eject(&swd->unit[drive]);
 936
 937         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 938         if (res)
 939                 release_mem_region(res->start, resource_size(res));
 940
 941         kfree(swd);
 942
 943         return 0;
 944 }
 945
 946 static struct platform_driver swim_driver = {
 947         .probe  = swim_probe,
 948         .remove = swim_remove,
 949         .driver   = {
 950                 .name   = CARDNAME,
 951         },
 952 };
 953
 954 static int __init swim_init(void)
 955 {
 956         printk(KERN_INFO "SWIM floppy driver %s\n", DRIVER_VERSION);
 957
 958         return platform_driver_register(&swim_driver);
 959 }
 960 module_init(swim_init);
 961
 962 static void __exit swim_exit(void)
 963 {
 964         platform_driver_unregister(&swim_driver);
 965 }
 966 module_exit(swim_exit);
 967
 968 MODULE_DESCRIPTION("Driver for SWIM floppy controller");
 969 MODULE_LICENSE("GPL");
 970 MODULE_AUTHOR("Laurent Vivier <laurent@lvivier.info>");
 971 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);