drivers/block/swim3.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Driver for the SWIM3 (Super Woz Integrated Machine 3)
   4  * floppy controller found on Power Macintoshes.
   5  *
   6  * Copyright (C) 1996 Paul Mackerras.
   7  */
   8
   9 /*
  10  * TODO:
  11  * handle 2 drives
  12  * handle GCR disks
  13  */
  14
  15 #undef DEBUG
  16
  17 #include <linux/stddef.h>
  18 #include <linux/kernel.h>
  19 #include <linux/sched/signal.h>
  20 #include <linux/timer.h>
  21 #include <linux/delay.h>
  22 #include <linux/fd.h>
  23 #include <linux/ioctl.h>
  24 #include <linux/blk-mq.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/mutex.h>
  27 #include <linux/module.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/wait.h>
  30 #include <linux/major.h>
  31 #include <asm/io.h>
  32 #include <asm/dbdma.h>
  33 #include <asm/prom.h>
  34 #include <linux/uaccess.h>
  35 #include <asm/mediabay.h>
  36 #include <asm/machdep.h>
  37 #include <asm/pmac_feature.h>
  38
  39 #define MAX_FLOPPIES    2
  40
  41 static DEFINE_MUTEX(swim3_mutex);
  42 static struct gendisk *disks[MAX_FLOPPIES];
  43
  44 enum swim_state {
  45         idle,
  46         locating,
  47         seeking,
  48         settling,
  49         do_transfer,
  50         jogging,
  51         available,
  52         revalidating,
  53         ejecting
  54 };
  55
  56 #define REG(x)  unsigned char x; char x ## _pad[15];
  57
  58 /*
  59  * The names for these registers mostly represent speculation on my part.
  60  * It will be interesting to see how close they are to the names Apple uses.
  61  */
  62 struct swim3 {
  63         REG(data);
  64         REG(timer);             /* counts down at 1MHz */
  65         REG(error);
  66         REG(mode);
  67         REG(select);            /* controls CA0, CA1, CA2 and LSTRB signals */
  68         REG(setup);
  69         REG(control);           /* writing bits clears them */
  70         REG(status);            /* writing bits sets them in control */
  71         REG(intr);
  72         REG(nseek);             /* # tracks to seek */
  73         REG(ctrack);            /* current track number */
  74         REG(csect);             /* current sector number */
  75         REG(gap3);              /* size of gap 3 in track format */
  76         REG(sector);            /* sector # to read or write */
  77         REG(nsect);             /* # sectors to read or write */
  78         REG(intr_enable);
  79 };
  80
  81 #define control_bic     control
  82 #define control_bis     status
  83
  84 /* Bits in select register */
  85 #define CA_MASK         7
  86 #define LSTRB           8
  87
  88 /* Bits in control register */
  89 #define DO_SEEK         0x80
  90 #define FORMAT          0x40
  91 #define SELECT          0x20
  92 #define WRITE_SECTORS   0x10
  93 #define DO_ACTION       0x08
  94 #define DRIVE2_ENABLE   0x04
  95 #define DRIVE_ENABLE    0x02
  96 #define INTR_ENABLE     0x01
  97
  98 /* Bits in status register */
  99 #define FIFO_1BYTE      0x80
 100 #define FIFO_2BYTE      0x40
 101 #define ERROR           0x20
 102 #define DATA            0x08
 103 #define RDDATA          0x04
 104 #define INTR_PENDING    0x02
 105 #define MARK_BYTE       0x01
 106
 107 /* Bits in intr and intr_enable registers */
 108 #define ERROR_INTR      0x20
 109 #define DATA_CHANGED    0x10
 110 #define TRANSFER_DONE   0x08
 111 #define SEEN_SECTOR     0x04
 112 #define SEEK_DONE       0x02
 113 #define TIMER_DONE      0x01
 114
 115 /* Bits in error register */
 116 #define ERR_DATA_CRC    0x80
 117 #define ERR_ADDR_CRC    0x40
 118 #define ERR_OVERRUN     0x04
 119 #define ERR_UNDERRUN    0x01
 120
 121 /* Bits in setup register */
 122 #define S_SW_RESET      0x80
 123 #define S_GCR_WRITE     0x40
 124 #define S_IBM_DRIVE     0x20
 125 #define S_TEST_MODE     0x10
 126 #define S_FCLK_DIV2     0x08
 127 #define S_GCR           0x04
 128 #define S_COPY_PROT     0x02
 129 #define S_INV_WDATA     0x01
 130
 131 /* Select values for swim3_action */
 132 #define SEEK_POSITIVE   0
 133 #define SEEK_NEGATIVE   4
 134 #define STEP            1
 135 #define MOTOR_ON        2
 136 #define MOTOR_OFF       6
 137 #define INDEX           3
 138 #define EJECT           7
 139 #define SETMFM          9
 140 #define SETGCR          13
 141
 142 /* Select values for swim3_select and swim3_readbit */
 143 #define STEP_DIR        0
 144 #define STEPPING        1
 145 #define MOTOR_ON        2
 146 #define RELAX           3       /* also eject in progress */
 147 #define READ_DATA_0     4
 148 #define ONEMEG_DRIVE    5
 149 #define SINGLE_SIDED    6       /* drive or diskette is 4MB type? */
 150 #define DRIVE_PRESENT   7
 151 #define DISK_IN         8
 152 #define WRITE_PROT      9
 153 #define TRACK_ZERO      10
 154 #define TACHO           11
 155 #define READ_DATA_1     12
 156 #define GCR_MODE        13
 157 #define SEEK_COMPLETE   14
 158 #define TWOMEG_MEDIA    15
 159
 160 /* Definitions of values used in writing and formatting */
 161 #define DATA_ESCAPE     0x99
 162 #define GCR_SYNC_EXC    0x3f
 163 #define GCR_SYNC_CONV   0x80
 164 #define GCR_FIRST_MARK  0xd5
 165 #define GCR_SECOND_MARK 0xaa
 166 #define GCR_ADDR_MARK   "\xd5\xaa\x00"
 167 #define GCR_DATA_MARK   "\xd5\xaa\x0b"
 168 #define GCR_SLIP_BYTE   "\x27\xaa"
 169 #define GCR_SELF_SYNC   "\x3f\xbf\x1e\x34\x3c\x3f"
 170
 171 #define DATA_99         "\x99\x99"
 172 #define MFM_ADDR_MARK   "\x99\xa1\x99\xa1\x99\xa1\x99\xfe"
 173 #define MFM_INDEX_MARK  "\x99\xc2\x99\xc2\x99\xc2\x99\xfc"
 174 #define MFM_GAP_LEN     12
 175
 176 struct floppy_state {
 177         enum swim_state state;
 178         struct swim3 __iomem *swim3;    /* hardware registers */
 179         struct dbdma_regs __iomem *dma; /* DMA controller registers */
 180         int     swim3_intr;     /* interrupt number for SWIM3 */
 181         int     dma_intr;       /* interrupt number for DMA channel */
 182         int     cur_cyl;        /* cylinder head is on, or -1 */
 183         int     cur_sector;     /* last sector we saw go past */
 184         int     req_cyl;        /* the cylinder for the current r/w request */
 185         int     head;           /* head number ditto */
 186         int     req_sector;     /* sector number ditto */
 187         int     scount;         /* # sectors we're transferring at present */
 188         int     retries;
 189         int     settle_time;
 190         int     secpercyl;      /* disk geometry information */
 191         int     secpertrack;
 192         int     total_secs;
 193         int     write_prot;     /* 1 if write-protected, 0 if not, -1 dunno */
 194         struct dbdma_cmd *dma_cmd;
 195         int     ref_count;
 196         int     expect_cyl;
 197         struct timer_list timeout;
 198         int     timeout_pending;
 199         int     ejected;
 200         wait_queue_head_t wait;
 201         int     wanted;
 202         struct macio_dev *mdev;
 203         char    dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
 204         int     index;
 205         struct request *cur_req;
 206         struct blk_mq_tag_set tag_set;
 207 };
 208
 209 #define swim3_err(fmt, arg...)  dev_err(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
 210 #define swim3_warn(fmt, arg...) dev_warn(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
 211 #define swim3_info(fmt, arg...) dev_info(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
 212
 213 #ifdef DEBUG
 214 #define swim3_dbg(fmt, arg...)  dev_dbg(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
 215 #else
 216 #define swim3_dbg(fmt, arg...)  do { } while(0)
 217 #endif
 218
 219 static struct floppy_state floppy_states[MAX_FLOPPIES];
 220 static int floppy_count = 0;
 221 static DEFINE_SPINLOCK(swim3_lock);
 222
 223 static unsigned short write_preamble[] = {
 224         0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */
 225         0, 0, 0, 0, 0, 0,                       /* sync field */
 226         0x99a1, 0x99a1, 0x99a1, 0x99fb,         /* data address mark */
 227         0x990f                                  /* no escape for 512 bytes */
 228 };
 229
 230 static unsigned short write_postamble[] = {
 231         0x9904,                                 /* insert CRC */
 232         0x4e4e, 0x4e4e,
 233         0x9908,                                 /* stop writing */
 234         0, 0, 0, 0, 0, 0
 235 };
 236
 237 static void seek_track(struct floppy_state *fs, int n);
 238 static void act(struct floppy_state *fs);
 239 static void scan_timeout(struct timer_list *t);
 240 static void seek_timeout(struct timer_list *t);
 241 static void settle_timeout(struct timer_list *t);
 242 static void xfer_timeout(struct timer_list *t);
 243 static irqreturn_t swim3_interrupt(int irq, void *dev_id);
 244 /*static void fd_dma_interrupt(int irq, void *dev_id);*/
 245 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 246                       int interruptible);
 247 static void release_drive(struct floppy_state *fs);
 248 static int fd_eject(struct floppy_state *fs);
 249 static int floppy_ioctl(struct block_device *bdev, blk_mode_t mode,
 250                         unsigned int cmd, unsigned long param);
 251 static int floppy_open(struct gendisk *disk, blk_mode_t mode);
 252 static unsigned int floppy_check_events(struct gendisk *disk,
 253                                         unsigned int clearing);
 254 static int floppy_revalidate(struct gendisk *disk);
 255
 256 static bool swim3_end_request(struct floppy_state *fs, blk_status_t err, unsigned int nr_bytes)
 257 {
 258         struct request *req = fs->cur_req;
 259
 260         swim3_dbg("  end request, err=%d nr_bytes=%d, cur_req=%p\n",
 261                   err, nr_bytes, req);
 262
 263         if (err)
 264                 nr_bytes = blk_rq_cur_bytes(req);
 265         if (blk_update_request(req, err, nr_bytes))
 266                 return true;
 267         __blk_mq_end_request(req, err);
 268         fs->cur_req = NULL;
 269         return false;
 270 }
 271
 272 static void swim3_select(struct floppy_state *fs, int sel)
 273 {
 274         struct swim3 __iomem *sw = fs->swim3;
 275
 276         out_8(&sw->select, RELAX);
 277         if (sel & 8)
 278                 out_8(&sw->control_bis, SELECT);
 279         else
 280                 out_8(&sw->control_bic, SELECT);
 281         out_8(&sw->select, sel & CA_MASK);
 282 }
 283
 284 static void swim3_action(struct floppy_state *fs, int action)
 285 {
 286         struct swim3 __iomem *sw = fs->swim3;
 287
 288         swim3_select(fs, action);
 289         udelay(1);
 290         out_8(&sw->select, sw->select | LSTRB);
 291         udelay(2);
 292         out_8(&sw->select, sw->select & ~LSTRB);
 293         udelay(1);
 294 }
 295
 296 static int swim3_readbit(struct floppy_state *fs, int bit)
 297 {
 298         struct swim3 __iomem *sw = fs->swim3;
 299         int stat;
 300
 301         swim3_select(fs, bit);
 302         udelay(1);
 303         stat = in_8(&sw->status);
 304         return (stat & DATA) == 0;
 305 }
 306
 307 static blk_status_t swim3_queue_rq(struct blk_mq_hw_ctx *hctx,
 308                                    const struct blk_mq_queue_data *bd)
 309 {
 310         struct floppy_state *fs = hctx->queue->queuedata;
 311         struct request *req = bd->rq;
 312         unsigned long x;
 313
 314         spin_lock_irq(&swim3_lock);
 315         if (fs->cur_req || fs->state != idle) {
 316                 spin_unlock_irq(&swim3_lock);
 317                 return BLK_STS_DEV_RESOURCE;
 318         }
 319         blk_mq_start_request(req);
 320         fs->cur_req = req;
 321         if (fs->mdev->media_bay &&
 322             check_media_bay(fs->mdev->media_bay) != MB_FD) {
 323                 swim3_dbg("%s", "  media bay absent, dropping req\n");
 324                 swim3_end_request(fs, BLK_STS_IOERR, 0);
 325                 goto out;
 326         }
 327         if (fs->ejected) {
 328                 swim3_dbg("%s", "  disk ejected\n");
 329                 swim3_end_request(fs, BLK_STS_IOERR, 0);
 330                 goto out;
 331         }
 332         if (rq_data_dir(req) == WRITE) {
 333                 if (fs->write_prot < 0)
 334                         fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 335                 if (fs->write_prot) {
 336                         swim3_dbg("%s", "  try to write, disk write protected\n");
 337                         swim3_end_request(fs, BLK_STS_IOERR, 0);
 338                         goto out;
 339                 }
 340         }
 341
 342         /*
 343          * Do not remove the cast. blk_rq_pos(req) is now a sector_t and can be
 344          * 64 bits, but it will never go past 32 bits for this driver anyway, so
 345          * we can safely cast it down and not have to do a 64/32 division
 346          */
 347         fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl;
 348         x = ((long)blk_rq_pos(req)) % fs->secpercyl;
 349         fs->head = x / fs->secpertrack;
 350         fs->req_sector = x % fs->secpertrack + 1;
 351         fs->state = do_transfer;
 352         fs->retries = 0;
 353
 354         act(fs);
 355
 356 out:
 357         spin_unlock_irq(&swim3_lock);
 358         return BLK_STS_OK;
 359 }
 360
 361 static void set_timeout(struct floppy_state *fs, int nticks,
 362                         void (*proc)(struct timer_list *t))
 363 {
 364         if (fs->timeout_pending)
 365                 del_timer(&fs->timeout);
 366         fs->timeout.expires = jiffies + nticks;
 367         fs->timeout.function = proc;
 368         add_timer(&fs->timeout);
 369         fs->timeout_pending = 1;
 370 }
 371
 372 static inline void scan_track(struct floppy_state *fs)
 373 {
 374         struct swim3 __iomem *sw = fs->swim3;
 375
 376         swim3_select(fs, READ_DATA_0);
 377         in_8(&sw->intr);                /* clear SEEN_SECTOR bit */
 378         in_8(&sw->error);
 379         out_8(&sw->intr_enable, SEEN_SECTOR);
 380         out_8(&sw->control_bis, DO_ACTION);
 381         /* enable intr when track found */
 382         set_timeout(fs, HZ, scan_timeout);      /* enable timeout */
 383 }
 384
 385 static inline void seek_track(struct floppy_state *fs, int n)
 386 {
 387         struct swim3 __iomem *sw = fs->swim3;
 388
 389         if (n >= 0) {
 390                 swim3_action(fs, SEEK_POSITIVE);
 391                 sw->nseek = n;
 392         } else {
 393                 swim3_action(fs, SEEK_NEGATIVE);
 394                 sw->nseek = -n;
 395         }
 396         fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
 397         swim3_select(fs, STEP);
 398         in_8(&sw->error);
 399         /* enable intr when seek finished */
 400         out_8(&sw->intr_enable, SEEK_DONE);
 401         out_8(&sw->control_bis, DO_SEEK);
 402         set_timeout(fs, 3*HZ, seek_timeout);    /* enable timeout */
 403         fs->settle_time = 0;
 404 }
 405
 406 /*
 407  * XXX: this is a horrible hack, but at least allows ppc32 to get
 408  * out of defining virt_to_bus, and this driver out of using the
 409  * deprecated block layer bounce buffering for highmem addresses
 410  * for no good reason.
 411  */
 412 static unsigned long swim3_phys_to_bus(phys_addr_t paddr)
 413 {
 414         return paddr + PCI_DRAM_OFFSET;
 415 }
 416
 417 static phys_addr_t swim3_bio_phys(struct bio *bio)
 418 {
 419         return page_to_phys(bio_page(bio)) + bio_offset(bio);
 420 }
 421
 422 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
 423                             phys_addr_t paddr, int count)
 424 {
 425         cp->req_count = cpu_to_le16(count);
 426         cp->command = cpu_to_le16(cmd);
 427         cp->phy_addr = cpu_to_le32(swim3_phys_to_bus(paddr));
 428         cp->xfer_status = 0;
 429 }
 430
 431 static inline void setup_transfer(struct floppy_state *fs)
 432 {
 433         int n;
 434         struct swim3 __iomem *sw = fs->swim3;
 435         struct dbdma_cmd *cp = fs->dma_cmd;
 436         struct dbdma_regs __iomem *dr = fs->dma;
 437         struct request *req = fs->cur_req;
 438
 439         if (blk_rq_cur_sectors(req) <= 0) {
 440                 swim3_warn("%s", "Transfer 0 sectors ?\n");
 441                 return;
 442         }
 443         if (rq_data_dir(req) == WRITE)
 444                 n = 1;
 445         else {
 446                 n = fs->secpertrack - fs->req_sector + 1;
 447                 if (n > blk_rq_cur_sectors(req))
 448                         n = blk_rq_cur_sectors(req);
 449         }
 450
 451         swim3_dbg("  setup xfer at sect %d (of %d) head %d for %d\n",
 452                   fs->req_sector, fs->secpertrack, fs->head, n);
 453
 454         fs->scount = n;
 455         swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
 456         out_8(&sw->sector, fs->req_sector);
 457         out_8(&sw->nsect, n);
 458         out_8(&sw->gap3, 0);
 459         out_le32(&dr->cmdptr, swim3_phys_to_bus(virt_to_phys(cp)));
 460         if (rq_data_dir(req) == WRITE) {
 461                 /* Set up 3 dma commands: write preamble, data, postamble */
 462                 init_dma(cp, OUTPUT_MORE, virt_to_phys(write_preamble),
 463                          sizeof(write_preamble));
 464                 ++cp;
 465                 init_dma(cp, OUTPUT_MORE, swim3_bio_phys(req->bio), 512);
 466                 ++cp;
 467                 init_dma(cp, OUTPUT_LAST, virt_to_phys(write_postamble),
 468                         sizeof(write_postamble));
 469         } else {
 470                 init_dma(cp, INPUT_LAST, swim3_bio_phys(req->bio), n * 512);
 471         }
 472         ++cp;
 473         out_le16(&cp->command, DBDMA_STOP);
 474         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 475         in_8(&sw->error);
 476         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 477         if (rq_data_dir(req) == WRITE)
 478                 out_8(&sw->control_bis, WRITE_SECTORS);
 479         in_8(&sw->intr);
 480         out_le32(&dr->control, (RUN << 16) | RUN);
 481         /* enable intr when transfer complete */
 482         out_8(&sw->intr_enable, TRANSFER_DONE);
 483         out_8(&sw->control_bis, DO_ACTION);
 484         set_timeout(fs, 2*HZ, xfer_timeout);    /* enable timeout */
 485 }
 486
 487 static void act(struct floppy_state *fs)
 488 {
 489         for (;;) {
 490                 swim3_dbg("  act loop, state=%d, req_cyl=%d, cur_cyl=%d\n",
 491                           fs->state, fs->req_cyl, fs->cur_cyl);
 492
 493                 switch (fs->state) {
 494                 case idle:
 495                         return;         /* XXX shouldn't get here */
 496
 497                 case locating:
 498                         if (swim3_readbit(fs, TRACK_ZERO)) {
 499                                 swim3_dbg("%s", "    locate track 0\n");
 500                                 fs->cur_cyl = 0;
 501                                 if (fs->req_cyl == 0)
 502                                         fs->state = do_transfer;
 503                                 else
 504                                         fs->state = seeking;
 505                                 break;
 506                         }
 507                         scan_track(fs);
 508                         return;
 509
 510                 case seeking:
 511                         if (fs->cur_cyl < 0) {
 512                                 fs->expect_cyl = -1;
 513                                 fs->state = locating;
 514                                 break;
 515                         }
 516                         if (fs->req_cyl == fs->cur_cyl) {
 517                                 swim3_warn("%s", "Whoops, seeking 0\n");
 518                                 fs->state = do_transfer;
 519                                 break;
 520                         }
 521                         seek_track(fs, fs->req_cyl - fs->cur_cyl);
 522                         return;
 523
 524                 case settling:
 525                         /* check for SEEK_COMPLETE after 30ms */
 526                         fs->settle_time = (HZ + 32) / 33;
 527                         set_timeout(fs, fs->settle_time, settle_timeout);
 528                         return;
 529
 530                 case do_transfer:
 531                         if (fs->cur_cyl != fs->req_cyl) {
 532                                 if (fs->retries > 5) {
 533                                         swim3_err("Wrong cylinder in transfer, want: %d got %d\n",
 534                                                   fs->req_cyl, fs->cur_cyl);
 535                                         swim3_end_request(fs, BLK_STS_IOERR, 0);
 536                                         fs->state = idle;
 537                                         return;
 538                                 }
 539                                 fs->state = seeking;
 540                                 break;
 541                         }
 542                         setup_transfer(fs);
 543                         return;
 544
 545                 case jogging:
 546                         seek_track(fs, -5);
 547                         return;
 548
 549                 default:
 550                         swim3_err("Unknown state %d\n", fs->state);
 551                         return;
 552                 }
 553         }
 554 }
 555
 556 static void scan_timeout(struct timer_list *t)
 557 {
 558         struct floppy_state *fs = from_timer(fs, t, timeout);
 559         struct swim3 __iomem *sw = fs->swim3;
 560         unsigned long flags;
 561
 562         swim3_dbg("* scan timeout, state=%d\n", fs->state);
 563
 564         spin_lock_irqsave(&swim3_lock, flags);
 565         fs->timeout_pending = 0;
 566         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 567         out_8(&sw->select, RELAX);
 568         out_8(&sw->intr_enable, 0);
 569         fs->cur_cyl = -1;
 570         if (fs->retries > 5) {
 571                 swim3_end_request(fs, BLK_STS_IOERR, 0);
 572                 fs->state = idle;
 573         } else {
 574                 fs->state = jogging;
 575                 act(fs);
 576         }
 577         spin_unlock_irqrestore(&swim3_lock, flags);
 578 }
 579
 580 static void seek_timeout(struct timer_list *t)
 581 {
 582         struct floppy_state *fs = from_timer(fs, t, timeout);
 583         struct swim3 __iomem *sw = fs->swim3;
 584         unsigned long flags;
 585
 586         swim3_dbg("* seek timeout, state=%d\n", fs->state);
 587
 588         spin_lock_irqsave(&swim3_lock, flags);
 589         fs->timeout_pending = 0;
 590         out_8(&sw->control_bic, DO_SEEK);
 591         out_8(&sw->select, RELAX);
 592         out_8(&sw->intr_enable, 0);
 593         swim3_err("%s", "Seek timeout\n");
 594         swim3_end_request(fs, BLK_STS_IOERR, 0);
 595         fs->state = idle;
 596         spin_unlock_irqrestore(&swim3_lock, flags);
 597 }
 598
 599 static void settle_timeout(struct timer_list *t)
 600 {
 601         struct floppy_state *fs = from_timer(fs, t, timeout);
 602         struct swim3 __iomem *sw = fs->swim3;
 603         unsigned long flags;
 604
 605         swim3_dbg("* settle timeout, state=%d\n", fs->state);
 606
 607         spin_lock_irqsave(&swim3_lock, flags);
 608         fs->timeout_pending = 0;
 609         if (swim3_readbit(fs, SEEK_COMPLETE)) {
 610                 out_8(&sw->select, RELAX);
 611                 fs->state = locating;
 612                 act(fs);
 613                 goto unlock;
 614         }
 615         out_8(&sw->select, RELAX);
 616         if (fs->settle_time < 2*HZ) {
 617                 ++fs->settle_time;
 618                 set_timeout(fs, 1, settle_timeout);
 619                 goto unlock;
 620         }
 621         swim3_err("%s", "Seek settle timeout\n");
 622         swim3_end_request(fs, BLK_STS_IOERR, 0);
 623         fs->state = idle;
 624  unlock:
 625         spin_unlock_irqrestore(&swim3_lock, flags);
 626 }
 627
 628 static void xfer_timeout(struct timer_list *t)
 629 {
 630         struct floppy_state *fs = from_timer(fs, t, timeout);
 631         struct swim3 __iomem *sw = fs->swim3;
 632         struct dbdma_regs __iomem *dr = fs->dma;
 633         unsigned long flags;
 634         int n;
 635
 636         swim3_dbg("* xfer timeout, state=%d\n", fs->state);
 637
 638         spin_lock_irqsave(&swim3_lock, flags);
 639         fs->timeout_pending = 0;
 640         out_le32(&dr->control, RUN << 16);
 641         /* We must wait a bit for dbdma to stop */
 642         for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
 643                 udelay(1);
 644         out_8(&sw->intr_enable, 0);
 645         out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 646         out_8(&sw->select, RELAX);
 647         swim3_err("Timeout %sing sector %ld\n",
 648                (rq_data_dir(fs->cur_req)==WRITE? "writ": "read"),
 649                (long)blk_rq_pos(fs->cur_req));
 650         swim3_end_request(fs, BLK_STS_IOERR, 0);
 651         fs->state = idle;
 652         spin_unlock_irqrestore(&swim3_lock, flags);
 653 }
 654
 655 static irqreturn_t swim3_interrupt(int irq, void *dev_id)
 656 {
 657         struct floppy_state *fs = (struct floppy_state *) dev_id;
 658         struct swim3 __iomem *sw = fs->swim3;
 659         int intr, err, n;
 660         int stat, resid;
 661         struct dbdma_regs __iomem *dr;
 662         struct dbdma_cmd *cp;
 663         unsigned long flags;
 664         struct request *req = fs->cur_req;
 665
 666         swim3_dbg("* interrupt, state=%d\n", fs->state);
 667
 668         spin_lock_irqsave(&swim3_lock, flags);
 669         intr = in_8(&sw->intr);
 670         err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
 671         if ((intr & ERROR_INTR) && fs->state != do_transfer)
 672                 swim3_err("Non-transfer error interrupt: state=%d, dir=%x, intr=%x, err=%x\n",
 673                           fs->state, rq_data_dir(req), intr, err);
 674         switch (fs->state) {
 675         case locating:
 676                 if (intr & SEEN_SECTOR) {
 677                         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 678                         out_8(&sw->select, RELAX);
 679                         out_8(&sw->intr_enable, 0);
 680                         del_timer(&fs->timeout);
 681                         fs->timeout_pending = 0;
 682                         if (sw->ctrack == 0xff) {
 683                                 swim3_err("%s", "Seen sector but cyl=ff?\n");
 684                                 fs->cur_cyl = -1;
 685                                 if (fs->retries > 5) {
 686                                         swim3_end_request(fs, BLK_STS_IOERR, 0);
 687                                         fs->state = idle;
 688                                 } else {
 689                                         fs->state = jogging;
 690                                         act(fs);
 691                                 }
 692                                 break;
 693                         }
 694                         fs->cur_cyl = sw->ctrack;
 695                         fs->cur_sector = sw->csect;
 696                         if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
 697                                 swim3_err("Expected cyl %d, got %d\n",
 698                                           fs->expect_cyl, fs->cur_cyl);
 699                         fs->state = do_transfer;
 700                         act(fs);
 701                 }
 702                 break;
 703         case seeking:
 704         case jogging:
 705                 if (sw->nseek == 0) {
 706                         out_8(&sw->control_bic, DO_SEEK);
 707                         out_8(&sw->select, RELAX);
 708                         out_8(&sw->intr_enable, 0);
 709                         del_timer(&fs->timeout);
 710                         fs->timeout_pending = 0;
 711                         if (fs->state == seeking)
 712                                 ++fs->retries;
 713                         fs->state = settling;
 714                         act(fs);
 715                 }
 716                 break;
 717         case settling:
 718                 out_8(&sw->intr_enable, 0);
 719                 del_timer(&fs->timeout);
 720                 fs->timeout_pending = 0;
 721                 act(fs);
 722                 break;
 723         case do_transfer:
 724                 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
 725                         break;
 726                 out_8(&sw->intr_enable, 0);
 727                 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 728                 out_8(&sw->select, RELAX);
 729                 del_timer(&fs->timeout);
 730                 fs->timeout_pending = 0;
 731                 dr = fs->dma;
 732                 cp = fs->dma_cmd;
 733                 if (rq_data_dir(req) == WRITE)
 734                         ++cp;
 735                 /*
 736                  * Check that the main data transfer has finished.
 737                  * On writing, the swim3 sometimes doesn't use
 738                  * up all the bytes of the postamble, so we can still
 739                  * see DMA active here.  That doesn't matter as long
 740                  * as all the sector data has been transferred.
 741                  */
 742                 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
 743                         /* wait a little while for DMA to complete */
 744                         for (n = 0; n < 100; ++n) {
 745                                 if (cp->xfer_status != 0)
 746                                         break;
 747                                 udelay(1);
 748                                 barrier();
 749                         }
 750                 }
 751                 /* turn off DMA */
 752                 out_le32(&dr->control, (RUN | PAUSE) << 16);
 753                 stat = le16_to_cpu(cp->xfer_status);
 754                 resid = le16_to_cpu(cp->res_count);
 755                 if (intr & ERROR_INTR) {
 756                         n = fs->scount - 1 - resid / 512;
 757                         if (n > 0) {
 758                                 blk_update_request(req, 0, n << 9);
 759                                 fs->req_sector += n;
 760                         }
 761                         if (fs->retries < 5) {
 762                                 ++fs->retries;
 763                                 act(fs);
 764                         } else {
 765                                 swim3_err("Error %sing block %ld (err=%x)\n",
 766                                        rq_data_dir(req) == WRITE? "writ": "read",
 767                                        (long)blk_rq_pos(req), err);
 768                                 swim3_end_request(fs, BLK_STS_IOERR, 0);
 769                                 fs->state = idle;
 770                         }
 771                 } else {
 772                         if ((stat & ACTIVE) == 0 || resid != 0) {
 773                                 /* musta been an error */
 774                                 swim3_err("fd dma error: stat=%x resid=%d\n", stat, resid);
 775                                 swim3_err("  state=%d, dir=%x, intr=%x, err=%x\n",
 776                                           fs->state, rq_data_dir(req), intr, err);
 777                                 swim3_end_request(fs, BLK_STS_IOERR, 0);
 778                                 fs->state = idle;
 779                                 break;
 780                         }
 781                         fs->retries = 0;
 782                         if (swim3_end_request(fs, 0, fs->scount << 9)) {
 783                                 fs->req_sector += fs->scount;
 784                                 if (fs->req_sector > fs->secpertrack) {
 785                                         fs->req_sector -= fs->secpertrack;
 786                                         if (++fs->head > 1) {
 787                                                 fs->head = 0;
 788                                                 ++fs->req_cyl;
 789                                         }
 790                                 }
 791                                 act(fs);
 792                         } else
 793                                 fs->state = idle;
 794                 }
 795                 break;
 796         default:
 797                 swim3_err("Don't know what to do in state %d\n", fs->state);
 798         }
 799         spin_unlock_irqrestore(&swim3_lock, flags);
 800         return IRQ_HANDLED;
 801 }
 802
 803 /*
 804 static void fd_dma_interrupt(int irq, void *dev_id)
 805 {
 806 }
 807 */
 808
 809 /* Called under the mutex to grab exclusive access to a drive */
 810 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 811                       int interruptible)
 812 {
 813         unsigned long flags;
 814
 815         swim3_dbg("%s", "-> grab drive\n");
 816
 817         spin_lock_irqsave(&swim3_lock, flags);
 818         if (fs->state != idle && fs->state != available) {
 819                 ++fs->wanted;
 820                 /* this will enable irqs in order to sleep */
 821                 if (!interruptible)
 822                         wait_event_lock_irq(fs->wait,
 823                                         fs->state == available,
 824                                         swim3_lock);
 825                 else if (wait_event_interruptible_lock_irq(fs->wait,
 826                                         fs->state == available,
 827                                         swim3_lock)) {
 828                         --fs->wanted;
 829                         spin_unlock_irqrestore(&swim3_lock, flags);
 830                         return -EINTR;
 831                 }
 832                 --fs->wanted;
 833         }
 834         fs->state = state;
 835         spin_unlock_irqrestore(&swim3_lock, flags);
 836
 837         return 0;
 838 }
 839
 840 static void release_drive(struct floppy_state *fs)
 841 {
 842         struct request_queue *q = disks[fs->index]->queue;
 843         unsigned long flags;
 844
 845         swim3_dbg("%s", "-> release drive\n");
 846
 847         spin_lock_irqsave(&swim3_lock, flags);
 848         fs->state = idle;
 849         spin_unlock_irqrestore(&swim3_lock, flags);
 850
 851         blk_mq_freeze_queue(q);
 852         blk_mq_quiesce_queue(q);
 853         blk_mq_unquiesce_queue(q);
 854         blk_mq_unfreeze_queue(q);
 855 }
 856
 857 static int fd_eject(struct floppy_state *fs)
 858 {
 859         int err, n;
 860
 861         err = grab_drive(fs, ejecting, 1);
 862         if (err)
 863                 return err;
 864         swim3_action(fs, EJECT);
 865         for (n = 20; n > 0; --n) {
 866                 if (signal_pending(current)) {
 867                         err = -EINTR;
 868                         break;
 869                 }
 870                 swim3_select(fs, RELAX);
 871                 schedule_timeout_interruptible(1);
 872                 if (swim3_readbit(fs, DISK_IN) == 0)
 873                         break;
 874         }
 875         swim3_select(fs, RELAX);
 876         udelay(150);
 877         fs->ejected = 1;
 878         release_drive(fs);
 879         return err;
 880 }
 881
 882 static struct floppy_struct floppy_type =
 883         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL };    /*  7 1.44MB 3.5"   */
 884
 885 static int floppy_locked_ioctl(struct block_device *bdev, blk_mode_t mode,
 886                         unsigned int cmd, unsigned long param)
 887 {
 888         struct floppy_state *fs = bdev->bd_disk->private_data;
 889         int err;
 890
 891         if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
 892                 return -EPERM;
 893
 894         if (fs->mdev->media_bay &&
 895             check_media_bay(fs->mdev->media_bay) != MB_FD)
 896                 return -ENXIO;
 897
 898         switch (cmd) {
 899         case FDEJECT:
 900                 if (fs->ref_count != 1)
 901                         return -EBUSY;
 902                 err = fd_eject(fs);
 903                 return err;
 904         case FDGETPRM:
 905                 if (copy_to_user((void __user *) param, &floppy_type,
 906                                  sizeof(struct floppy_struct)))
 907                         return -EFAULT;
 908                 return 0;
 909         }
 910         return -ENOTTY;
 911 }
 912
 913 static int floppy_ioctl(struct block_device *bdev, blk_mode_t mode,
 914                                  unsigned int cmd, unsigned long param)
 915 {
 916         int ret;
 917
 918         mutex_lock(&swim3_mutex);
 919         ret = floppy_locked_ioctl(bdev, mode, cmd, param);
 920         mutex_unlock(&swim3_mutex);
 921
 922         return ret;
 923 }
 924
 925 static int floppy_open(struct gendisk *disk, blk_mode_t mode)
 926 {
 927         struct floppy_state *fs = disk->private_data;
 928         struct swim3 __iomem *sw = fs->swim3;
 929         int n, err = 0;
 930
 931         if (fs->ref_count == 0) {
 932                 if (fs->mdev->media_bay &&
 933                     check_media_bay(fs->mdev->media_bay) != MB_FD)
 934                         return -ENXIO;
 935                 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
 936                 out_8(&sw->control_bic, 0xff);
 937                 out_8(&sw->mode, 0x95);
 938                 udelay(10);
 939                 out_8(&sw->intr_enable, 0);
 940                 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
 941                 swim3_action(fs, MOTOR_ON);
 942                 fs->write_prot = -1;
 943                 fs->cur_cyl = -1;
 944                 for (n = 0; n < 2 * HZ; ++n) {
 945                         if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
 946                                 break;
 947                         if (signal_pending(current)) {
 948                                 err = -EINTR;
 949                                 break;
 950                         }
 951                         swim3_select(fs, RELAX);
 952                         schedule_timeout_interruptible(1);
 953                 }
 954                 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
 955                                  || swim3_readbit(fs, DISK_IN) == 0))
 956                         err = -ENXIO;
 957                 swim3_action(fs, SETMFM);
 958                 swim3_select(fs, RELAX);
 959
 960         } else if (fs->ref_count == -1 || mode & BLK_OPEN_EXCL)
 961                 return -EBUSY;
 962
 963         if (err == 0 && !(mode & BLK_OPEN_NDELAY) &&
 964             (mode & (BLK_OPEN_READ | BLK_OPEN_WRITE))) {
 965                 if (disk_check_media_change(disk))
 966                         floppy_revalidate(disk);
 967                 if (fs->ejected)
 968                         err = -ENXIO;
 969         }
 970
 971         if (err == 0 && (mode & BLK_OPEN_WRITE)) {
 972                 if (fs->write_prot < 0)
 973                         fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 974                 if (fs->write_prot)
 975                         err = -EROFS;
 976         }
 977
 978         if (err) {
 979                 if (fs->ref_count == 0) {
 980                         swim3_action(fs, MOTOR_OFF);
 981                         out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
 982                         swim3_select(fs, RELAX);
 983                 }
 984                 return err;
 985         }
 986
 987         if (mode & BLK_OPEN_EXCL)
 988                 fs->ref_count = -1;
 989         else
 990                 ++fs->ref_count;
 991
 992         return 0;
 993 }
 994
 995 static int floppy_unlocked_open(struct gendisk *disk, blk_mode_t mode)
 996 {
 997         int ret;
 998
 999         mutex_lock(&swim3_mutex);
1000         ret = floppy_open(disk, mode);
1001         mutex_unlock(&swim3_mutex);
1002
1003         return ret;
1004 }
1005
1006 static void floppy_release(struct gendisk *disk)
1007 {
1008         struct floppy_state *fs = disk->private_data;
1009         struct swim3 __iomem *sw = fs->swim3;
1010
1011         mutex_lock(&swim3_mutex);
1012         if (fs->ref_count > 0)
1013                 --fs->ref_count;
1014         else if (fs->ref_count == -1)
1015                 fs->ref_count = 0;
1016         if (fs->ref_count == 0) {
1017                 swim3_action(fs, MOTOR_OFF);
1018                 out_8(&sw->control_bic, 0xff);
1019                 swim3_select(fs, RELAX);
1020         }
1021         mutex_unlock(&swim3_mutex);
1022 }
1023
1024 static unsigned int floppy_check_events(struct gendisk *disk,
1025                                         unsigned int clearing)
1026 {
1027         struct floppy_state *fs = disk->private_data;
1028         return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0;
1029 }
1030
1031 static int floppy_revalidate(struct gendisk *disk)
1032 {
1033         struct floppy_state *fs = disk->private_data;
1034         struct swim3 __iomem *sw;
1035         int ret, n;
1036
1037         if (fs->mdev->media_bay &&
1038             check_media_bay(fs->mdev->media_bay) != MB_FD)
1039                 return -ENXIO;
1040
1041         sw = fs->swim3;
1042         grab_drive(fs, revalidating, 0);
1043         out_8(&sw->intr_enable, 0);
1044         out_8(&sw->control_bis, DRIVE_ENABLE);
1045         swim3_action(fs, MOTOR_ON);     /* necessary? */
1046         fs->write_prot = -1;
1047         fs->cur_cyl = -1;
1048         mdelay(1);
1049         for (n = HZ; n > 0; --n) {
1050                 if (swim3_readbit(fs, SEEK_COMPLETE))
1051                         break;
1052                 if (signal_pending(current))
1053                         break;
1054                 swim3_select(fs, RELAX);
1055                 schedule_timeout_interruptible(1);
1056         }
1057         ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
1058                 || swim3_readbit(fs, DISK_IN) == 0;
1059         if (ret)
1060                 swim3_action(fs, MOTOR_OFF);
1061         else {
1062                 fs->ejected = 0;
1063                 swim3_action(fs, SETMFM);
1064         }
1065         swim3_select(fs, RELAX);
1066
1067         release_drive(fs);
1068         return ret;
1069 }
1070
1071 static const struct block_device_operations floppy_fops = {
1072         .open           = floppy_unlocked_open,
1073         .release        = floppy_release,
1074         .ioctl          = floppy_ioctl,
1075         .check_events   = floppy_check_events,
1076 };
1077
1078 static const struct blk_mq_ops swim3_mq_ops = {
1079         .queue_rq = swim3_queue_rq,
1080 };
1081
1082 static void swim3_mb_event(struct macio_dev* mdev, int mb_state)
1083 {
1084         struct floppy_state *fs = macio_get_drvdata(mdev);
1085         struct swim3 __iomem *sw;
1086
1087         if (!fs)
1088                 return;
1089
1090         sw = fs->swim3;
1091
1092         if (mb_state != MB_FD)
1093                 return;
1094
1095         /* Clear state */
1096         out_8(&sw->intr_enable, 0);
1097         in_8(&sw->intr);
1098         in_8(&sw->error);
1099 }
1100
1101 static int swim3_add_device(struct macio_dev *mdev, int index)
1102 {
1103         struct device_node *swim = mdev->ofdev.dev.of_node;
1104         struct floppy_state *fs = &floppy_states[index];
1105         int rc = -EBUSY;
1106
1107         fs->mdev = mdev;
1108         fs->index = index;
1109
1110         /* Check & Request resources */
1111         if (macio_resource_count(mdev) < 2) {
1112                 swim3_err("%s", "No address in device-tree\n");
1113                 return -ENXIO;
1114         }
1115         if (macio_irq_count(mdev) < 1) {
1116                 swim3_err("%s", "No interrupt in device-tree\n");
1117                 return -ENXIO;
1118         }
1119         if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
1120                 swim3_err("%s", "Can't request mmio resource\n");
1121                 return -EBUSY;
1122         }
1123         if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
1124                 swim3_err("%s", "Can't request dma resource\n");
1125                 macio_release_resource(mdev, 0);
1126                 return -EBUSY;
1127         }
1128         dev_set_drvdata(&mdev->ofdev.dev, fs);
1129
1130         if (mdev->media_bay == NULL)
1131                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1132
1133         fs->state = idle;
1134         fs->swim3 = (struct swim3 __iomem *)
1135                 ioremap(macio_resource_start(mdev, 0), 0x200);
1136         if (fs->swim3 == NULL) {
1137                 swim3_err("%s", "Couldn't map mmio registers\n");
1138                 rc = -ENOMEM;
1139                 goto out_release;
1140         }
1141         fs->dma = (struct dbdma_regs __iomem *)
1142                 ioremap(macio_resource_start(mdev, 1), 0x200);
1143         if (fs->dma == NULL) {
1144                 swim3_err("%s", "Couldn't map dma registers\n");
1145                 iounmap(fs->swim3);
1146                 rc = -ENOMEM;
1147                 goto out_release;
1148         }
1149         fs->swim3_intr = macio_irq(mdev, 0);
1150         fs->dma_intr = macio_irq(mdev, 1);
1151         fs->cur_cyl = -1;
1152         fs->cur_sector = -1;
1153         fs->secpercyl = 36;
1154         fs->secpertrack = 18;
1155         fs->total_secs = 2880;
1156         init_waitqueue_head(&fs->wait);
1157
1158         fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1159         memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1160         fs->dma_cmd[1].command = cpu_to_le16(DBDMA_STOP);
1161
1162         if (mdev->media_bay == NULL || check_media_bay(mdev->media_bay) == MB_FD)
1163                 swim3_mb_event(mdev, MB_FD);
1164
1165         if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1166                 swim3_err("%s", "Couldn't request interrupt\n");
1167                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1168                 goto out_unmap;
1169         }
1170
1171         timer_setup(&fs->timeout, NULL, 0);
1172
1173         swim3_info("SWIM3 floppy controller %s\n",
1174                 mdev->media_bay ? "in media bay" : "");
1175
1176         return 0;
1177
1178  out_unmap:
1179         iounmap(fs->dma);
1180         iounmap(fs->swim3);
1181
1182  out_release:
1183         macio_release_resource(mdev, 0);
1184         macio_release_resource(mdev, 1);
1185
1186         return rc;
1187 }
1188
1189 static int swim3_attach(struct macio_dev *mdev,
1190                         const struct of_device_id *match)
1191 {
1192         struct floppy_state *fs;
1193         struct gendisk *disk;
1194         int rc;
1195
1196         if (floppy_count >= MAX_FLOPPIES)
1197                 return -ENXIO;
1198
1199         if (floppy_count == 0) {
1200                 rc = register_blkdev(FLOPPY_MAJOR, "fd");
1201                 if (rc)
1202                         return rc;
1203         }
1204
1205         fs = &floppy_states[floppy_count];
1206         memset(fs, 0, sizeof(*fs));
1207
1208         rc = blk_mq_alloc_sq_tag_set(&fs->tag_set, &swim3_mq_ops, 2,
1209                         BLK_MQ_F_SHOULD_MERGE);
1210         if (rc)
1211                 goto out_unregister;
1212
1213         disk = blk_mq_alloc_disk(&fs->tag_set, fs);
1214         if (IS_ERR(disk)) {
1215                 rc = PTR_ERR(disk);
1216                 goto out_free_tag_set;
1217         }
1218
1219         rc = swim3_add_device(mdev, floppy_count);
1220         if (rc)
1221                 goto out_cleanup_disk;
1222
1223         disk->major = FLOPPY_MAJOR;
1224         disk->first_minor = floppy_count;
1225         disk->minors = 1;
1226         disk->fops = &floppy_fops;
1227         disk->private_data = fs;
1228         disk->events = DISK_EVENT_MEDIA_CHANGE;
1229         disk->flags |= GENHD_FL_REMOVABLE | GENHD_FL_NO_PART;
1230         sprintf(disk->disk_name, "fd%d", floppy_count);
1231         set_capacity(disk, 2880);
1232         rc = add_disk(disk);
1233         if (rc)
1234                 goto out_cleanup_disk;
1235
1236         disks[floppy_count++] = disk;
1237         return 0;
1238
1239 out_cleanup_disk:
1240         put_disk(disk);
1241 out_free_tag_set:
1242         blk_mq_free_tag_set(&fs->tag_set);
1243 out_unregister:
1244         if (floppy_count == 0)
1245                 unregister_blkdev(FLOPPY_MAJOR, "fd");
1246         return rc;
1247 }
1248
1249 static const struct of_device_id swim3_match[] =
1250 {
1251         {
1252         .name           = "swim3",
1253         },
1254         {
1255         .compatible     = "ohare-swim3"
1256         },
1257         {
1258         .compatible     = "swim3"
1259         },
1260         { /* end of list */ }
1261 };
1262
1263 static struct macio_driver swim3_driver =
1264 {
1265         .driver = {
1266                 .name           = "swim3",
1267                 .of_match_table = swim3_match,
1268         },
1269         .probe          = swim3_attach,
1270 #ifdef CONFIG_PMAC_MEDIABAY
1271         .mediabay_event = swim3_mb_event,
1272 #endif
1273 #if 0
1274         .suspend        = swim3_suspend,
1275         .resume         = swim3_resume,
1276 #endif
1277 };
1278
1279
1280 static int swim3_init(void)
1281 {
1282         macio_register_driver(&swim3_driver);
1283         return 0;
1284 }
1285
1286 module_init(swim3_init)
1287
1288 MODULE_LICENSE("GPL");
1289 MODULE_AUTHOR("Paul Mackerras");
1290 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);