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, fmode_t mode,
 250                         unsigned int cmd, unsigned long param);
 251 static int floppy_open(struct block_device *bdev, fmode_t mode);
 252 static void floppy_release(struct gendisk *disk, fmode_t mode);
 253 static unsigned int floppy_check_events(struct gendisk *disk,
 254                                         unsigned int clearing);
 255 static int floppy_revalidate(struct gendisk *disk);
 256
 257 static bool swim3_end_request(struct floppy_state *fs, blk_status_t err, unsigned int nr_bytes)
 258 {
 259         struct request *req = fs->cur_req;
 260
 261         swim3_dbg("  end request, err=%d nr_bytes=%d, cur_req=%p\n",
 262                   err, nr_bytes, req);
 263
 264         if (err)
 265                 nr_bytes = blk_rq_cur_bytes(req);
 266         if (blk_update_request(req, err, nr_bytes))
 267                 return true;
 268         __blk_mq_end_request(req, err);
 269         fs->cur_req = NULL;
 270         return false;
 271 }
 272
 273 static void swim3_select(struct floppy_state *fs, int sel)
 274 {
 275         struct swim3 __iomem *sw = fs->swim3;
 276
 277         out_8(&sw->select, RELAX);
 278         if (sel & 8)
 279                 out_8(&sw->control_bis, SELECT);
 280         else
 281                 out_8(&sw->control_bic, SELECT);
 282         out_8(&sw->select, sel & CA_MASK);
 283 }
 284
 285 static void swim3_action(struct floppy_state *fs, int action)
 286 {
 287         struct swim3 __iomem *sw = fs->swim3;
 288
 289         swim3_select(fs, action);
 290         udelay(1);
 291         out_8(&sw->select, sw->select | LSTRB);
 292         udelay(2);
 293         out_8(&sw->select, sw->select & ~LSTRB);
 294         udelay(1);
 295 }
 296
 297 static int swim3_readbit(struct floppy_state *fs, int bit)
 298 {
 299         struct swim3 __iomem *sw = fs->swim3;
 300         int stat;
 301
 302         swim3_select(fs, bit);
 303         udelay(1);
 304         stat = in_8(&sw->status);
 305         return (stat & DATA) == 0;
 306 }
 307
 308 static blk_status_t swim3_queue_rq(struct blk_mq_hw_ctx *hctx,
 309                                    const struct blk_mq_queue_data *bd)
 310 {
 311         struct floppy_state *fs = hctx->queue->queuedata;
 312         struct request *req = bd->rq;
 313         unsigned long x;
 314
 315         spin_lock_irq(&swim3_lock);
 316         if (fs->cur_req || fs->state != idle) {
 317                 spin_unlock_irq(&swim3_lock);
 318                 return BLK_STS_DEV_RESOURCE;
 319         }
 320         blk_mq_start_request(req);
 321         fs->cur_req = req;
 322         if (fs->mdev->media_bay &&
 323             check_media_bay(fs->mdev->media_bay) != MB_FD) {
 324                 swim3_dbg("%s", "  media bay absent, dropping req\n");
 325                 swim3_end_request(fs, BLK_STS_IOERR, 0);
 326                 goto out;
 327         }
 328         if (fs->ejected) {
 329                 swim3_dbg("%s", "  disk ejected\n");
 330                 swim3_end_request(fs, BLK_STS_IOERR, 0);
 331                 goto out;
 332         }
 333         if (rq_data_dir(req) == WRITE) {
 334                 if (fs->write_prot < 0)
 335                         fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 336                 if (fs->write_prot) {
 337                         swim3_dbg("%s", "  try to write, disk write protected\n");
 338                         swim3_end_request(fs, BLK_STS_IOERR, 0);
 339                         goto out;
 340                 }
 341         }
 342
 343         /*
 344          * Do not remove the cast. blk_rq_pos(req) is now a sector_t and can be
 345          * 64 bits, but it will never go past 32 bits for this driver anyway, so
 346          * we can safely cast it down and not have to do a 64/32 division
 347          */
 348         fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl;
 349         x = ((long)blk_rq_pos(req)) % fs->secpercyl;
 350         fs->head = x / fs->secpertrack;
 351         fs->req_sector = x % fs->secpertrack + 1;
 352         fs->state = do_transfer;
 353         fs->retries = 0;
 354
 355         act(fs);
 356
 357 out:
 358         spin_unlock_irq(&swim3_lock);
 359         return BLK_STS_OK;
 360 }
 361
 362 static void set_timeout(struct floppy_state *fs, int nticks,
 363                         void (*proc)(struct timer_list *t))
 364 {
 365         if (fs->timeout_pending)
 366                 del_timer(&fs->timeout);
 367         fs->timeout.expires = jiffies + nticks;
 368         fs->timeout.function = proc;
 369         add_timer(&fs->timeout);
 370         fs->timeout_pending = 1;
 371 }
 372
 373 static inline void scan_track(struct floppy_state *fs)
 374 {
 375         struct swim3 __iomem *sw = fs->swim3;
 376
 377         swim3_select(fs, READ_DATA_0);
 378         in_8(&sw->intr);                /* clear SEEN_SECTOR bit */
 379         in_8(&sw->error);
 380         out_8(&sw->intr_enable, SEEN_SECTOR);
 381         out_8(&sw->control_bis, DO_ACTION);
 382         /* enable intr when track found */
 383         set_timeout(fs, HZ, scan_timeout);      /* enable timeout */
 384 }
 385
 386 static inline void seek_track(struct floppy_state *fs, int n)
 387 {
 388         struct swim3 __iomem *sw = fs->swim3;
 389
 390         if (n >= 0) {
 391                 swim3_action(fs, SEEK_POSITIVE);
 392                 sw->nseek = n;
 393         } else {
 394                 swim3_action(fs, SEEK_NEGATIVE);
 395                 sw->nseek = -n;
 396         }
 397         fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
 398         swim3_select(fs, STEP);
 399         in_8(&sw->error);
 400         /* enable intr when seek finished */
 401         out_8(&sw->intr_enable, SEEK_DONE);
 402         out_8(&sw->control_bis, DO_SEEK);
 403         set_timeout(fs, 3*HZ, seek_timeout);    /* enable timeout */
 404         fs->settle_time = 0;
 405 }
 406
 407 /*
 408  * XXX: this is a horrible hack, but at least allows ppc32 to get
 409  * out of defining virt_to_bus, and this driver out of using the
 410  * deprecated block layer bounce buffering for highmem addresses
 411  * for no good reason.
 412  */
 413 static unsigned long swim3_phys_to_bus(phys_addr_t paddr)
 414 {
 415         return paddr + PCI_DRAM_OFFSET;
 416 }
 417
 418 static phys_addr_t swim3_bio_phys(struct bio *bio)
 419 {
 420         return page_to_phys(bio_page(bio)) + bio_offset(bio);
 421 }
 422
 423 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
 424                             phys_addr_t paddr, int count)
 425 {
 426         cp->req_count = cpu_to_le16(count);
 427         cp->command = cpu_to_le16(cmd);
 428         cp->phy_addr = cpu_to_le32(swim3_phys_to_bus(paddr));
 429         cp->xfer_status = 0;
 430 }
 431
 432 static inline void setup_transfer(struct floppy_state *fs)
 433 {
 434         int n;
 435         struct swim3 __iomem *sw = fs->swim3;
 436         struct dbdma_cmd *cp = fs->dma_cmd;
 437         struct dbdma_regs __iomem *dr = fs->dma;
 438         struct request *req = fs->cur_req;
 439
 440         if (blk_rq_cur_sectors(req) <= 0) {
 441                 swim3_warn("%s", "Transfer 0 sectors ?\n");
 442                 return;
 443         }
 444         if (rq_data_dir(req) == WRITE)
 445                 n = 1;
 446         else {
 447                 n = fs->secpertrack - fs->req_sector + 1;
 448                 if (n > blk_rq_cur_sectors(req))
 449                         n = blk_rq_cur_sectors(req);
 450         }
 451
 452         swim3_dbg("  setup xfer at sect %d (of %d) head %d for %d\n",
 453                   fs->req_sector, fs->secpertrack, fs->head, n);
 454
 455         fs->scount = n;
 456         swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
 457         out_8(&sw->sector, fs->req_sector);
 458         out_8(&sw->nsect, n);
 459         out_8(&sw->gap3, 0);
 460         out_le32(&dr->cmdptr, swim3_phys_to_bus(virt_to_phys(cp)));
 461         if (rq_data_dir(req) == WRITE) {
 462                 /* Set up 3 dma commands: write preamble, data, postamble */
 463                 init_dma(cp, OUTPUT_MORE, virt_to_phys(write_preamble),
 464                          sizeof(write_preamble));
 465                 ++cp;
 466                 init_dma(cp, OUTPUT_MORE, swim3_bio_phys(req->bio), 512);
 467                 ++cp;
 468                 init_dma(cp, OUTPUT_LAST, virt_to_phys(write_postamble),
 469                         sizeof(write_postamble));
 470         } else {
 471                 init_dma(cp, INPUT_LAST, swim3_bio_phys(req->bio), n * 512);
 472         }
 473         ++cp;
 474         out_le16(&cp->command, DBDMA_STOP);
 475         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 476         in_8(&sw->error);
 477         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 478         if (rq_data_dir(req) == WRITE)
 479                 out_8(&sw->control_bis, WRITE_SECTORS);
 480         in_8(&sw->intr);
 481         out_le32(&dr->control, (RUN << 16) | RUN);
 482         /* enable intr when transfer complete */
 483         out_8(&sw->intr_enable, TRANSFER_DONE);
 484         out_8(&sw->control_bis, DO_ACTION);
 485         set_timeout(fs, 2*HZ, xfer_timeout);    /* enable timeout */
 486 }
 487
 488 static void act(struct floppy_state *fs)
 489 {
 490         for (;;) {
 491                 swim3_dbg("  act loop, state=%d, req_cyl=%d, cur_cyl=%d\n",
 492                           fs->state, fs->req_cyl, fs->cur_cyl);
 493
 494                 switch (fs->state) {
 495                 case idle:
 496                         return;         /* XXX shouldn't get here */
 497
 498                 case locating:
 499                         if (swim3_readbit(fs, TRACK_ZERO)) {
 500                                 swim3_dbg("%s", "    locate track 0\n");
 501                                 fs->cur_cyl = 0;
 502                                 if (fs->req_cyl == 0)
 503                                         fs->state = do_transfer;
 504                                 else
 505                                         fs->state = seeking;
 506                                 break;
 507                         }
 508                         scan_track(fs);
 509                         return;
 510
 511                 case seeking:
 512                         if (fs->cur_cyl < 0) {
 513                                 fs->expect_cyl = -1;
 514                                 fs->state = locating;
 515                                 break;
 516                         }
 517                         if (fs->req_cyl == fs->cur_cyl) {
 518                                 swim3_warn("%s", "Whoops, seeking 0\n");
 519                                 fs->state = do_transfer;
 520                                 break;
 521                         }
 522                         seek_track(fs, fs->req_cyl - fs->cur_cyl);
 523                         return;
 524
 525                 case settling:
 526                         /* check for SEEK_COMPLETE after 30ms */
 527                         fs->settle_time = (HZ + 32) / 33;
 528                         set_timeout(fs, fs->settle_time, settle_timeout);
 529                         return;
 530
 531                 case do_transfer:
 532                         if (fs->cur_cyl != fs->req_cyl) {
 533                                 if (fs->retries > 5) {
 534                                         swim3_err("Wrong cylinder in transfer, want: %d got %d\n",
 535                                                   fs->req_cyl, fs->cur_cyl);
 536                                         swim3_end_request(fs, BLK_STS_IOERR, 0);
 537                                         fs->state = idle;
 538                                         return;
 539                                 }
 540                                 fs->state = seeking;
 541                                 break;
 542                         }
 543                         setup_transfer(fs);
 544                         return;
 545
 546                 case jogging:
 547                         seek_track(fs, -5);
 548                         return;
 549
 550                 default:
 551                         swim3_err("Unknown state %d\n", fs->state);
 552                         return;
 553                 }
 554         }
 555 }
 556
 557 static void scan_timeout(struct timer_list *t)
 558 {
 559         struct floppy_state *fs = from_timer(fs, t, timeout);
 560         struct swim3 __iomem *sw = fs->swim3;
 561         unsigned long flags;
 562
 563         swim3_dbg("* scan timeout, state=%d\n", fs->state);
 564
 565         spin_lock_irqsave(&swim3_lock, flags);
 566         fs->timeout_pending = 0;
 567         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 568         out_8(&sw->select, RELAX);
 569         out_8(&sw->intr_enable, 0);
 570         fs->cur_cyl = -1;
 571         if (fs->retries > 5) {
 572                 swim3_end_request(fs, BLK_STS_IOERR, 0);
 573                 fs->state = idle;
 574         } else {
 575                 fs->state = jogging;
 576                 act(fs);
 577         }
 578         spin_unlock_irqrestore(&swim3_lock, flags);
 579 }
 580
 581 static void seek_timeout(struct timer_list *t)
 582 {
 583         struct floppy_state *fs = from_timer(fs, t, timeout);
 584         struct swim3 __iomem *sw = fs->swim3;
 585         unsigned long flags;
 586
 587         swim3_dbg("* seek timeout, state=%d\n", fs->state);
 588
 589         spin_lock_irqsave(&swim3_lock, flags);
 590         fs->timeout_pending = 0;
 591         out_8(&sw->control_bic, DO_SEEK);
 592         out_8(&sw->select, RELAX);
 593         out_8(&sw->intr_enable, 0);
 594         swim3_err("%s", "Seek timeout\n");
 595         swim3_end_request(fs, BLK_STS_IOERR, 0);
 596         fs->state = idle;
 597         spin_unlock_irqrestore(&swim3_lock, flags);
 598 }
 599
 600 static void settle_timeout(struct timer_list *t)
 601 {
 602         struct floppy_state *fs = from_timer(fs, t, timeout);
 603         struct swim3 __iomem *sw = fs->swim3;
 604         unsigned long flags;
 605
 606         swim3_dbg("* settle timeout, state=%d\n", fs->state);
 607
 608         spin_lock_irqsave(&swim3_lock, flags);
 609         fs->timeout_pending = 0;
 610         if (swim3_readbit(fs, SEEK_COMPLETE)) {
 611                 out_8(&sw->select, RELAX);
 612                 fs->state = locating;
 613                 act(fs);
 614                 goto unlock;
 615         }
 616         out_8(&sw->select, RELAX);
 617         if (fs->settle_time < 2*HZ) {
 618                 ++fs->settle_time;
 619                 set_timeout(fs, 1, settle_timeout);
 620                 goto unlock;
 621         }
 622         swim3_err("%s", "Seek settle timeout\n");
 623         swim3_end_request(fs, BLK_STS_IOERR, 0);
 624         fs->state = idle;
 625  unlock:
 626         spin_unlock_irqrestore(&swim3_lock, flags);
 627 }
 628
 629 static void xfer_timeout(struct timer_list *t)
 630 {
 631         struct floppy_state *fs = from_timer(fs, t, timeout);
 632         struct swim3 __iomem *sw = fs->swim3;
 633         struct dbdma_regs __iomem *dr = fs->dma;
 634         unsigned long flags;
 635         int n;
 636
 637         swim3_dbg("* xfer timeout, state=%d\n", fs->state);
 638
 639         spin_lock_irqsave(&swim3_lock, flags);
 640         fs->timeout_pending = 0;
 641         out_le32(&dr->control, RUN << 16);
 642         /* We must wait a bit for dbdma to stop */
 643         for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
 644                 udelay(1);
 645         out_8(&sw->intr_enable, 0);
 646         out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 647         out_8(&sw->select, RELAX);
 648         swim3_err("Timeout %sing sector %ld\n",
 649                (rq_data_dir(fs->cur_req)==WRITE? "writ": "read"),
 650                (long)blk_rq_pos(fs->cur_req));
 651         swim3_end_request(fs, BLK_STS_IOERR, 0);
 652         fs->state = idle;
 653         spin_unlock_irqrestore(&swim3_lock, flags);
 654 }
 655
 656 static irqreturn_t swim3_interrupt(int irq, void *dev_id)
 657 {
 658         struct floppy_state *fs = (struct floppy_state *) dev_id;
 659         struct swim3 __iomem *sw = fs->swim3;
 660         int intr, err, n;
 661         int stat, resid;
 662         struct dbdma_regs __iomem *dr;
 663         struct dbdma_cmd *cp;
 664         unsigned long flags;
 665         struct request *req = fs->cur_req;
 666
 667         swim3_dbg("* interrupt, state=%d\n", fs->state);
 668
 669         spin_lock_irqsave(&swim3_lock, flags);
 670         intr = in_8(&sw->intr);
 671         err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
 672         if ((intr & ERROR_INTR) && fs->state != do_transfer)
 673                 swim3_err("Non-transfer error interrupt: state=%d, dir=%x, intr=%x, err=%x\n",
 674                           fs->state, rq_data_dir(req), intr, err);
 675         switch (fs->state) {
 676         case locating:
 677                 if (intr & SEEN_SECTOR) {
 678                         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 679                         out_8(&sw->select, RELAX);
 680                         out_8(&sw->intr_enable, 0);
 681                         del_timer(&fs->timeout);
 682                         fs->timeout_pending = 0;
 683                         if (sw->ctrack == 0xff) {
 684                                 swim3_err("%s", "Seen sector but cyl=ff?\n");
 685                                 fs->cur_cyl = -1;
 686                                 if (fs->retries > 5) {
 687                                         swim3_end_request(fs, BLK_STS_IOERR, 0);
 688                                         fs->state = idle;
 689                                 } else {
 690                                         fs->state = jogging;
 691                                         act(fs);
 692                                 }
 693                                 break;
 694                         }
 695                         fs->cur_cyl = sw->ctrack;
 696                         fs->cur_sector = sw->csect;
 697                         if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
 698                                 swim3_err("Expected cyl %d, got %d\n",
 699                                           fs->expect_cyl, fs->cur_cyl);
 700                         fs->state = do_transfer;
 701                         act(fs);
 702                 }
 703                 break;
 704         case seeking:
 705         case jogging:
 706                 if (sw->nseek == 0) {
 707                         out_8(&sw->control_bic, DO_SEEK);
 708                         out_8(&sw->select, RELAX);
 709                         out_8(&sw->intr_enable, 0);
 710                         del_timer(&fs->timeout);
 711                         fs->timeout_pending = 0;
 712                         if (fs->state == seeking)
 713                                 ++fs->retries;
 714                         fs->state = settling;
 715                         act(fs);
 716                 }
 717                 break;
 718         case settling:
 719                 out_8(&sw->intr_enable, 0);
 720                 del_timer(&fs->timeout);
 721                 fs->timeout_pending = 0;
 722                 act(fs);
 723                 break;
 724         case do_transfer:
 725                 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
 726                         break;
 727                 out_8(&sw->intr_enable, 0);
 728                 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 729                 out_8(&sw->select, RELAX);
 730                 del_timer(&fs->timeout);
 731                 fs->timeout_pending = 0;
 732                 dr = fs->dma;
 733                 cp = fs->dma_cmd;
 734                 if (rq_data_dir(req) == WRITE)
 735                         ++cp;
 736                 /*
 737                  * Check that the main data transfer has finished.
 738                  * On writing, the swim3 sometimes doesn't use
 739                  * up all the bytes of the postamble, so we can still
 740                  * see DMA active here.  That doesn't matter as long
 741                  * as all the sector data has been transferred.
 742                  */
 743                 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
 744                         /* wait a little while for DMA to complete */
 745                         for (n = 0; n < 100; ++n) {
 746                                 if (cp->xfer_status != 0)
 747                                         break;
 748                                 udelay(1);
 749                                 barrier();
 750                         }
 751                 }
 752                 /* turn off DMA */
 753                 out_le32(&dr->control, (RUN | PAUSE) << 16);
 754                 stat = le16_to_cpu(cp->xfer_status);
 755                 resid = le16_to_cpu(cp->res_count);
 756                 if (intr & ERROR_INTR) {
 757                         n = fs->scount - 1 - resid / 512;
 758                         if (n > 0) {
 759                                 blk_update_request(req, 0, n << 9);
 760                                 fs->req_sector += n;
 761                         }
 762                         if (fs->retries < 5) {
 763                                 ++fs->retries;
 764                                 act(fs);
 765                         } else {
 766                                 swim3_err("Error %sing block %ld (err=%x)\n",
 767                                        rq_data_dir(req) == WRITE? "writ": "read",
 768                                        (long)blk_rq_pos(req), err);
 769                                 swim3_end_request(fs, BLK_STS_IOERR, 0);
 770                                 fs->state = idle;
 771                         }
 772                 } else {
 773                         if ((stat & ACTIVE) == 0 || resid != 0) {
 774                                 /* musta been an error */
 775                                 swim3_err("fd dma error: stat=%x resid=%d\n", stat, resid);
 776                                 swim3_err("  state=%d, dir=%x, intr=%x, err=%x\n",
 777                                           fs->state, rq_data_dir(req), intr, err);
 778                                 swim3_end_request(fs, BLK_STS_IOERR, 0);
 779                                 fs->state = idle;
 780                                 break;
 781                         }
 782                         fs->retries = 0;
 783                         if (swim3_end_request(fs, 0, fs->scount << 9)) {
 784                                 fs->req_sector += fs->scount;
 785                                 if (fs->req_sector > fs->secpertrack) {
 786                                         fs->req_sector -= fs->secpertrack;
 787                                         if (++fs->head > 1) {
 788                                                 fs->head = 0;
 789                                                 ++fs->req_cyl;
 790                                         }
 791                                 }
 792                                 act(fs);
 793                         } else
 794                                 fs->state = idle;
 795                 }
 796                 break;
 797         default:
 798                 swim3_err("Don't know what to do in state %d\n", fs->state);
 799         }
 800         spin_unlock_irqrestore(&swim3_lock, flags);
 801         return IRQ_HANDLED;
 802 }
 803
 804 /*
 805 static void fd_dma_interrupt(int irq, void *dev_id)
 806 {
 807 }
 808 */
 809
 810 /* Called under the mutex to grab exclusive access to a drive */
 811 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 812                       int interruptible)
 813 {
 814         unsigned long flags;
 815
 816         swim3_dbg("%s", "-> grab drive\n");
 817
 818         spin_lock_irqsave(&swim3_lock, flags);
 819         if (fs->state != idle && fs->state != available) {
 820                 ++fs->wanted;
 821                 /* this will enable irqs in order to sleep */
 822                 if (!interruptible)
 823                         wait_event_lock_irq(fs->wait,
 824                                         fs->state == available,
 825                                         swim3_lock);
 826                 else if (wait_event_interruptible_lock_irq(fs->wait,
 827                                         fs->state == available,
 828                                         swim3_lock)) {
 829                         --fs->wanted;
 830                         spin_unlock_irqrestore(&swim3_lock, flags);
 831                         return -EINTR;
 832                 }
 833                 --fs->wanted;
 834         }
 835         fs->state = state;
 836         spin_unlock_irqrestore(&swim3_lock, flags);
 837
 838         return 0;
 839 }
 840
 841 static void release_drive(struct floppy_state *fs)
 842 {
 843         struct request_queue *q = disks[fs->index]->queue;
 844         unsigned long flags;
 845
 846         swim3_dbg("%s", "-> release drive\n");
 847
 848         spin_lock_irqsave(&swim3_lock, flags);
 849         fs->state = idle;
 850         spin_unlock_irqrestore(&swim3_lock, flags);
 851
 852         blk_mq_freeze_queue(q);
 853         blk_mq_quiesce_queue(q);
 854         blk_mq_unquiesce_queue(q);
 855         blk_mq_unfreeze_queue(q);
 856 }
 857
 858 static int fd_eject(struct floppy_state *fs)
 859 {
 860         int err, n;
 861
 862         err = grab_drive(fs, ejecting, 1);
 863         if (err)
 864                 return err;
 865         swim3_action(fs, EJECT);
 866         for (n = 20; n > 0; --n) {
 867                 if (signal_pending(current)) {
 868                         err = -EINTR;
 869                         break;
 870                 }
 871                 swim3_select(fs, RELAX);
 872                 schedule_timeout_interruptible(1);
 873                 if (swim3_readbit(fs, DISK_IN) == 0)
 874                         break;
 875         }
 876         swim3_select(fs, RELAX);
 877         udelay(150);
 878         fs->ejected = 1;
 879         release_drive(fs);
 880         return err;
 881 }
 882
 883 static struct floppy_struct floppy_type =
 884         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL };    /*  7 1.44MB 3.5"   */
 885
 886 static int floppy_locked_ioctl(struct block_device *bdev, fmode_t mode,
 887                         unsigned int cmd, unsigned long param)
 888 {
 889         struct floppy_state *fs = bdev->bd_disk->private_data;
 890         int err;
 891
 892         if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
 893                 return -EPERM;
 894
 895         if (fs->mdev->media_bay &&
 896             check_media_bay(fs->mdev->media_bay) != MB_FD)
 897                 return -ENXIO;
 898
 899         switch (cmd) {
 900         case FDEJECT:
 901                 if (fs->ref_count != 1)
 902                         return -EBUSY;
 903                 err = fd_eject(fs);
 904                 return err;
 905         case FDGETPRM:
 906                 if (copy_to_user((void __user *) param, &floppy_type,
 907                                  sizeof(struct floppy_struct)))
 908                         return -EFAULT;
 909                 return 0;
 910         }
 911         return -ENOTTY;
 912 }
 913
 914 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
 915                                  unsigned int cmd, unsigned long param)
 916 {
 917         int ret;
 918
 919         mutex_lock(&swim3_mutex);
 920         ret = floppy_locked_ioctl(bdev, mode, cmd, param);
 921         mutex_unlock(&swim3_mutex);
 922
 923         return ret;
 924 }
 925
 926 static int floppy_open(struct block_device *bdev, fmode_t mode)
 927 {
 928         struct floppy_state *fs = bdev->bd_disk->private_data;
 929         struct swim3 __iomem *sw = fs->swim3;
 930         int n, err = 0;
 931
 932         if (fs->ref_count == 0) {
 933                 if (fs->mdev->media_bay &&
 934                     check_media_bay(fs->mdev->media_bay) != MB_FD)
 935                         return -ENXIO;
 936                 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
 937                 out_8(&sw->control_bic, 0xff);
 938                 out_8(&sw->mode, 0x95);
 939                 udelay(10);
 940                 out_8(&sw->intr_enable, 0);
 941                 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
 942                 swim3_action(fs, MOTOR_ON);
 943                 fs->write_prot = -1;
 944                 fs->cur_cyl = -1;
 945                 for (n = 0; n < 2 * HZ; ++n) {
 946                         if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
 947                                 break;
 948                         if (signal_pending(current)) {
 949                                 err = -EINTR;
 950                                 break;
 951                         }
 952                         swim3_select(fs, RELAX);
 953                         schedule_timeout_interruptible(1);
 954                 }
 955                 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
 956                                  || swim3_readbit(fs, DISK_IN) == 0))
 957                         err = -ENXIO;
 958                 swim3_action(fs, SETMFM);
 959                 swim3_select(fs, RELAX);
 960
 961         } else if (fs->ref_count == -1 || mode & FMODE_EXCL)
 962                 return -EBUSY;
 963
 964         if (err == 0 && (mode & FMODE_NDELAY) == 0
 965             && (mode & (FMODE_READ|FMODE_WRITE))) {
 966                 if (bdev_check_media_change(bdev))
 967                         floppy_revalidate(bdev->bd_disk);
 968                 if (fs->ejected)
 969                         err = -ENXIO;
 970         }
 971
 972         if (err == 0 && (mode & FMODE_WRITE)) {
 973                 if (fs->write_prot < 0)
 974                         fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 975                 if (fs->write_prot)
 976                         err = -EROFS;
 977         }
 978
 979         if (err) {
 980                 if (fs->ref_count == 0) {
 981                         swim3_action(fs, MOTOR_OFF);
 982                         out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
 983                         swim3_select(fs, RELAX);
 984                 }
 985                 return err;
 986         }
 987
 988         if (mode & FMODE_EXCL)
 989                 fs->ref_count = -1;
 990         else
 991                 ++fs->ref_count;
 992
 993         return 0;
 994 }
 995
 996 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
 997 {
 998         int ret;
 999
1000         mutex_lock(&swim3_mutex);
1001         ret = floppy_open(bdev, mode);
1002         mutex_unlock(&swim3_mutex);
1003
1004         return ret;
1005 }
1006
1007 static void floppy_release(struct gendisk *disk, fmode_t mode)
1008 {
1009         struct floppy_state *fs = disk->private_data;
1010         struct swim3 __iomem *sw = fs->swim3;
1011
1012         mutex_lock(&swim3_mutex);
1013         if (fs->ref_count > 0)
1014                 --fs->ref_count;
1015         else if (fs->ref_count == -1)
1016                 fs->ref_count = 0;
1017         if (fs->ref_count == 0) {
1018                 swim3_action(fs, MOTOR_OFF);
1019                 out_8(&sw->control_bic, 0xff);
1020                 swim3_select(fs, RELAX);
1021         }
1022         mutex_unlock(&swim3_mutex);
1023 }
1024
1025 static unsigned int floppy_check_events(struct gendisk *disk,
1026                                         unsigned int clearing)
1027 {
1028         struct floppy_state *fs = disk->private_data;
1029         return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0;
1030 }
1031
1032 static int floppy_revalidate(struct gendisk *disk)
1033 {
1034         struct floppy_state *fs = disk->private_data;
1035         struct swim3 __iomem *sw;
1036         int ret, n;
1037
1038         if (fs->mdev->media_bay &&
1039             check_media_bay(fs->mdev->media_bay) != MB_FD)
1040                 return -ENXIO;
1041
1042         sw = fs->swim3;
1043         grab_drive(fs, revalidating, 0);
1044         out_8(&sw->intr_enable, 0);
1045         out_8(&sw->control_bis, DRIVE_ENABLE);
1046         swim3_action(fs, MOTOR_ON);     /* necessary? */
1047         fs->write_prot = -1;
1048         fs->cur_cyl = -1;
1049         mdelay(1);
1050         for (n = HZ; n > 0; --n) {
1051                 if (swim3_readbit(fs, SEEK_COMPLETE))
1052                         break;
1053                 if (signal_pending(current))
1054                         break;
1055                 swim3_select(fs, RELAX);
1056                 schedule_timeout_interruptible(1);
1057         }
1058         ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
1059                 || swim3_readbit(fs, DISK_IN) == 0;
1060         if (ret)
1061                 swim3_action(fs, MOTOR_OFF);
1062         else {
1063                 fs->ejected = 0;
1064                 swim3_action(fs, SETMFM);
1065         }
1066         swim3_select(fs, RELAX);
1067
1068         release_drive(fs);
1069         return ret;
1070 }
1071
1072 static const struct block_device_operations floppy_fops = {
1073         .open           = floppy_unlocked_open,
1074         .release        = floppy_release,
1075         .ioctl          = floppy_ioctl,
1076         .check_events   = floppy_check_events,
1077 };
1078
1079 static const struct blk_mq_ops swim3_mq_ops = {
1080         .queue_rq = swim3_queue_rq,
1081 };
1082
1083 static void swim3_mb_event(struct macio_dev* mdev, int mb_state)
1084 {
1085         struct floppy_state *fs = macio_get_drvdata(mdev);
1086         struct swim3 __iomem *sw;
1087
1088         if (!fs)
1089                 return;
1090
1091         sw = fs->swim3;
1092
1093         if (mb_state != MB_FD)
1094                 return;
1095
1096         /* Clear state */
1097         out_8(&sw->intr_enable, 0);
1098         in_8(&sw->intr);
1099         in_8(&sw->error);
1100 }
1101
1102 static int swim3_add_device(struct macio_dev *mdev, int index)
1103 {
1104         struct device_node *swim = mdev->ofdev.dev.of_node;
1105         struct floppy_state *fs = &floppy_states[index];
1106         int rc = -EBUSY;
1107
1108         fs->mdev = mdev;
1109         fs->index = index;
1110
1111         /* Check & Request resources */
1112         if (macio_resource_count(mdev) < 2) {
1113                 swim3_err("%s", "No address in device-tree\n");
1114                 return -ENXIO;
1115         }
1116         if (macio_irq_count(mdev) < 1) {
1117                 swim3_err("%s", "No interrupt in device-tree\n");
1118                 return -ENXIO;
1119         }
1120         if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
1121                 swim3_err("%s", "Can't request mmio resource\n");
1122                 return -EBUSY;
1123         }
1124         if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
1125                 swim3_err("%s", "Can't request dma resource\n");
1126                 macio_release_resource(mdev, 0);
1127                 return -EBUSY;
1128         }
1129         dev_set_drvdata(&mdev->ofdev.dev, fs);
1130
1131         if (mdev->media_bay == NULL)
1132                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1133
1134         fs->state = idle;
1135         fs->swim3 = (struct swim3 __iomem *)
1136                 ioremap(macio_resource_start(mdev, 0), 0x200);
1137         if (fs->swim3 == NULL) {
1138                 swim3_err("%s", "Couldn't map mmio registers\n");
1139                 rc = -ENOMEM;
1140                 goto out_release;
1141         }
1142         fs->dma = (struct dbdma_regs __iomem *)
1143                 ioremap(macio_resource_start(mdev, 1), 0x200);
1144         if (fs->dma == NULL) {
1145                 swim3_err("%s", "Couldn't map dma registers\n");
1146                 iounmap(fs->swim3);
1147                 rc = -ENOMEM;
1148                 goto out_release;
1149         }
1150         fs->swim3_intr = macio_irq(mdev, 0);
1151         fs->dma_intr = macio_irq(mdev, 1);
1152         fs->cur_cyl = -1;
1153         fs->cur_sector = -1;
1154         fs->secpercyl = 36;
1155         fs->secpertrack = 18;
1156         fs->total_secs = 2880;
1157         init_waitqueue_head(&fs->wait);
1158
1159         fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1160         memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1161         fs->dma_cmd[1].command = cpu_to_le16(DBDMA_STOP);
1162
1163         if (mdev->media_bay == NULL || check_media_bay(mdev->media_bay) == MB_FD)
1164                 swim3_mb_event(mdev, MB_FD);
1165
1166         if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1167                 swim3_err("%s", "Couldn't request interrupt\n");
1168                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1169                 goto out_unmap;
1170         }
1171
1172         timer_setup(&fs->timeout, NULL, 0);
1173
1174         swim3_info("SWIM3 floppy controller %s\n",
1175                 mdev->media_bay ? "in media bay" : "");
1176
1177         return 0;
1178
1179  out_unmap:
1180         iounmap(fs->dma);
1181         iounmap(fs->swim3);
1182
1183  out_release:
1184         macio_release_resource(mdev, 0);
1185         macio_release_resource(mdev, 1);
1186
1187         return rc;
1188 }
1189
1190 static int swim3_attach(struct macio_dev *mdev,
1191                         const struct of_device_id *match)
1192 {
1193         struct floppy_state *fs;
1194         struct gendisk *disk;
1195         int rc;
1196
1197         if (floppy_count >= MAX_FLOPPIES)
1198                 return -ENXIO;
1199
1200         if (floppy_count == 0) {
1201                 rc = register_blkdev(FLOPPY_MAJOR, "fd");
1202                 if (rc)
1203                         return rc;
1204         }
1205
1206         fs = &floppy_states[floppy_count];
1207         memset(fs, 0, sizeof(*fs));
1208
1209         rc = blk_mq_alloc_sq_tag_set(&fs->tag_set, &swim3_mq_ops, 2,
1210                         BLK_MQ_F_SHOULD_MERGE);
1211         if (rc)
1212                 goto out_unregister;
1213
1214         disk = blk_mq_alloc_disk(&fs->tag_set, fs);
1215         if (IS_ERR(disk)) {
1216                 rc = PTR_ERR(disk);
1217                 goto out_free_tag_set;
1218         }
1219
1220         rc = swim3_add_device(mdev, floppy_count);
1221         if (rc)
1222                 goto out_cleanup_disk;
1223
1224         disk->major = FLOPPY_MAJOR;
1225         disk->first_minor = floppy_count;
1226         disk->minors = 1;
1227         disk->fops = &floppy_fops;
1228         disk->private_data = fs;
1229         disk->events = DISK_EVENT_MEDIA_CHANGE;
1230         disk->flags |= GENHD_FL_REMOVABLE | GENHD_FL_NO_PART;
1231         sprintf(disk->disk_name, "fd%d", floppy_count);
1232         set_capacity(disk, 2880);
1233         rc = add_disk(disk);
1234         if (rc)
1235                 goto out_cleanup_disk;
1236
1237         disks[floppy_count++] = disk;
1238         return 0;
1239
1240 out_cleanup_disk:
1241         put_disk(disk);
1242 out_free_tag_set:
1243         blk_mq_free_tag_set(&fs->tag_set);
1244 out_unregister:
1245         if (floppy_count == 0)
1246                 unregister_blkdev(FLOPPY_MAJOR, "fd");
1247         return rc;
1248 }
1249
1250 static const struct of_device_id swim3_match[] =
1251 {
1252         {
1253         .name           = "swim3",
1254         },
1255         {
1256         .compatible     = "ohare-swim3"
1257         },
1258         {
1259         .compatible     = "swim3"
1260         },
1261         { /* end of list */ }
1262 };
1263
1264 static struct macio_driver swim3_driver =
1265 {
1266         .driver = {
1267                 .name           = "swim3",
1268                 .of_match_table = swim3_match,
1269         },
1270         .probe          = swim3_attach,
1271 #ifdef CONFIG_PMAC_MEDIABAY
1272         .mediabay_event = swim3_mb_event,
1273 #endif
1274 #if 0
1275         .suspend        = swim3_suspend,
1276         .resume         = swim3_resume,
1277 #endif
1278 };
1279
1280
1281 int swim3_init(void)
1282 {
1283         macio_register_driver(&swim3_driver);
1284         return 0;
1285 }
1286
1287 module_init(swim3_init)
1288
1289 MODULE_LICENSE("GPL");
1290 MODULE_AUTHOR("Paul Mackerras");
1291 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);