drivers/block/swim3.c

   1 /*
   2  * Driver for the SWIM3 (Super Woz Integrated Machine 3)
   3  * floppy controller found on Power Macintoshes.
   4  *
   5  * Copyright (C) 1996 Paul Mackerras.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version
  10  * 2 of the License, or (at your option) any later version.
  11  */
  12
  13 /*
  14  * TODO:
  15  * handle 2 drives
  16  * handle GCR disks
  17  */
  18
  19 #undef DEBUG
  20
  21 #include <linux/stddef.h>
  22 #include <linux/kernel.h>
  23 #include <linux/sched/signal.h>
  24 #include <linux/timer.h>
  25 #include <linux/delay.h>
  26 #include <linux/fd.h>
  27 #include <linux/ioctl.h>
  28 #include <linux/blkdev.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/mutex.h>
  31 #include <linux/module.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/wait.h>
  34 #include <asm/io.h>
  35 #include <asm/dbdma.h>
  36 #include <asm/prom.h>
  37 #include <linux/uaccess.h>
  38 #include <asm/mediabay.h>
  39 #include <asm/machdep.h>
  40 #include <asm/pmac_feature.h>
  41
  42 #define MAX_FLOPPIES    2
  43
  44 static DEFINE_MUTEX(swim3_mutex);
  45 static struct gendisk *disks[MAX_FLOPPIES];
  46
  47 enum swim_state {
  48         idle,
  49         locating,
  50         seeking,
  51         settling,
  52         do_transfer,
  53         jogging,
  54         available,
  55         revalidating,
  56         ejecting
  57 };
  58
  59 #define REG(x)  unsigned char x; char x ## _pad[15];
  60
  61 /*
  62  * The names for these registers mostly represent speculation on my part.
  63  * It will be interesting to see how close they are to the names Apple uses.
  64  */
  65 struct swim3 {
  66         REG(data);
  67         REG(timer);             /* counts down at 1MHz */
  68         REG(error);
  69         REG(mode);
  70         REG(select);            /* controls CA0, CA1, CA2 and LSTRB signals */
  71         REG(setup);
  72         REG(control);           /* writing bits clears them */
  73         REG(status);            /* writing bits sets them in control */
  74         REG(intr);
  75         REG(nseek);             /* # tracks to seek */
  76         REG(ctrack);            /* current track number */
  77         REG(csect);             /* current sector number */
  78         REG(gap3);              /* size of gap 3 in track format */
  79         REG(sector);            /* sector # to read or write */
  80         REG(nsect);             /* # sectors to read or write */
  81         REG(intr_enable);
  82 };
  83
  84 #define control_bic     control
  85 #define control_bis     status
  86
  87 /* Bits in select register */
  88 #define CA_MASK         7
  89 #define LSTRB           8
  90
  91 /* Bits in control register */
  92 #define DO_SEEK         0x80
  93 #define FORMAT          0x40
  94 #define SELECT          0x20
  95 #define WRITE_SECTORS   0x10
  96 #define DO_ACTION       0x08
  97 #define DRIVE2_ENABLE   0x04
  98 #define DRIVE_ENABLE    0x02
  99 #define INTR_ENABLE     0x01
 100
 101 /* Bits in status register */
 102 #define FIFO_1BYTE      0x80
 103 #define FIFO_2BYTE      0x40
 104 #define ERROR           0x20
 105 #define DATA            0x08
 106 #define RDDATA          0x04
 107 #define INTR_PENDING    0x02
 108 #define MARK_BYTE       0x01
 109
 110 /* Bits in intr and intr_enable registers */
 111 #define ERROR_INTR      0x20
 112 #define DATA_CHANGED    0x10
 113 #define TRANSFER_DONE   0x08
 114 #define SEEN_SECTOR     0x04
 115 #define SEEK_DONE       0x02
 116 #define TIMER_DONE      0x01
 117
 118 /* Bits in error register */
 119 #define ERR_DATA_CRC    0x80
 120 #define ERR_ADDR_CRC    0x40
 121 #define ERR_OVERRUN     0x04
 122 #define ERR_UNDERRUN    0x01
 123
 124 /* Bits in setup register */
 125 #define S_SW_RESET      0x80
 126 #define S_GCR_WRITE     0x40
 127 #define S_IBM_DRIVE     0x20
 128 #define S_TEST_MODE     0x10
 129 #define S_FCLK_DIV2     0x08
 130 #define S_GCR           0x04
 131 #define S_COPY_PROT     0x02
 132 #define S_INV_WDATA     0x01
 133
 134 /* Select values for swim3_action */
 135 #define SEEK_POSITIVE   0
 136 #define SEEK_NEGATIVE   4
 137 #define STEP            1
 138 #define MOTOR_ON        2
 139 #define MOTOR_OFF       6
 140 #define INDEX           3
 141 #define EJECT           7
 142 #define SETMFM          9
 143 #define SETGCR          13
 144
 145 /* Select values for swim3_select and swim3_readbit */
 146 #define STEP_DIR        0
 147 #define STEPPING        1
 148 #define MOTOR_ON        2
 149 #define RELAX           3       /* also eject in progress */
 150 #define READ_DATA_0     4
 151 #define ONEMEG_DRIVE    5
 152 #define SINGLE_SIDED    6       /* drive or diskette is 4MB type? */
 153 #define DRIVE_PRESENT   7
 154 #define DISK_IN         8
 155 #define WRITE_PROT      9
 156 #define TRACK_ZERO      10
 157 #define TACHO           11
 158 #define READ_DATA_1     12
 159 #define GCR_MODE        13
 160 #define SEEK_COMPLETE   14
 161 #define TWOMEG_MEDIA    15
 162
 163 /* Definitions of values used in writing and formatting */
 164 #define DATA_ESCAPE     0x99
 165 #define GCR_SYNC_EXC    0x3f
 166 #define GCR_SYNC_CONV   0x80
 167 #define GCR_FIRST_MARK  0xd5
 168 #define GCR_SECOND_MARK 0xaa
 169 #define GCR_ADDR_MARK   "\xd5\xaa\x00"
 170 #define GCR_DATA_MARK   "\xd5\xaa\x0b"
 171 #define GCR_SLIP_BYTE   "\x27\xaa"
 172 #define GCR_SELF_SYNC   "\x3f\xbf\x1e\x34\x3c\x3f"
 173
 174 #define DATA_99         "\x99\x99"
 175 #define MFM_ADDR_MARK   "\x99\xa1\x99\xa1\x99\xa1\x99\xfe"
 176 #define MFM_INDEX_MARK  "\x99\xc2\x99\xc2\x99\xc2\x99\xfc"
 177 #define MFM_GAP_LEN     12
 178
 179 struct floppy_state {
 180         enum swim_state state;
 181         struct swim3 __iomem *swim3;    /* hardware registers */
 182         struct dbdma_regs __iomem *dma; /* DMA controller registers */
 183         int     swim3_intr;     /* interrupt number for SWIM3 */
 184         int     dma_intr;       /* interrupt number for DMA channel */
 185         int     cur_cyl;        /* cylinder head is on, or -1 */
 186         int     cur_sector;     /* last sector we saw go past */
 187         int     req_cyl;        /* the cylinder for the current r/w request */
 188         int     head;           /* head number ditto */
 189         int     req_sector;     /* sector number ditto */
 190         int     scount;         /* # sectors we're transferring at present */
 191         int     retries;
 192         int     settle_time;
 193         int     secpercyl;      /* disk geometry information */
 194         int     secpertrack;
 195         int     total_secs;
 196         int     write_prot;     /* 1 if write-protected, 0 if not, -1 dunno */
 197         struct dbdma_cmd *dma_cmd;
 198         int     ref_count;
 199         int     expect_cyl;
 200         struct timer_list timeout;
 201         int     timeout_pending;
 202         int     ejected;
 203         wait_queue_head_t wait;
 204         int     wanted;
 205         struct macio_dev *mdev;
 206         char    dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
 207         int     index;
 208         struct request *cur_req;
 209 };
 210
 211 #define swim3_err(fmt, arg...)  dev_err(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
 212 #define swim3_warn(fmt, arg...) dev_warn(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
 213 #define swim3_info(fmt, arg...) dev_info(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
 214
 215 #ifdef DEBUG
 216 #define swim3_dbg(fmt, arg...)  dev_dbg(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
 217 #else
 218 #define swim3_dbg(fmt, arg...)  do { } while(0)
 219 #endif
 220
 221 static struct floppy_state floppy_states[MAX_FLOPPIES];
 222 static int floppy_count = 0;
 223 static DEFINE_SPINLOCK(swim3_lock);
 224
 225 static unsigned short write_preamble[] = {
 226         0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */
 227         0, 0, 0, 0, 0, 0,                       /* sync field */
 228         0x99a1, 0x99a1, 0x99a1, 0x99fb,         /* data address mark */
 229         0x990f                                  /* no escape for 512 bytes */
 230 };
 231
 232 static unsigned short write_postamble[] = {
 233         0x9904,                                 /* insert CRC */
 234         0x4e4e, 0x4e4e,
 235         0x9908,                                 /* stop writing */
 236         0, 0, 0, 0, 0, 0
 237 };
 238
 239 static void seek_track(struct floppy_state *fs, int n);
 240 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count);
 241 static void act(struct floppy_state *fs);
 242 static void scan_timeout(struct timer_list *t);
 243 static void seek_timeout(struct timer_list *t);
 244 static void settle_timeout(struct timer_list *t);
 245 static void xfer_timeout(struct timer_list *t);
 246 static irqreturn_t swim3_interrupt(int irq, void *dev_id);
 247 /*static void fd_dma_interrupt(int irq, void *dev_id);*/
 248 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 249                       int interruptible);
 250 static void release_drive(struct floppy_state *fs);
 251 static int fd_eject(struct floppy_state *fs);
 252 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
 253                         unsigned int cmd, unsigned long param);
 254 static int floppy_open(struct block_device *bdev, fmode_t mode);
 255 static void floppy_release(struct gendisk *disk, fmode_t mode);
 256 static unsigned int floppy_check_events(struct gendisk *disk,
 257                                         unsigned int clearing);
 258 static int floppy_revalidate(struct gendisk *disk);
 259
 260 static bool swim3_end_request(struct floppy_state *fs, blk_status_t err, unsigned int nr_bytes)
 261 {
 262         struct request *req = fs->cur_req;
 263         int rc;
 264
 265         swim3_dbg("  end request, err=%d nr_bytes=%d, cur_req=%p\n",
 266                   err, nr_bytes, req);
 267
 268         if (err)
 269                 nr_bytes = blk_rq_cur_bytes(req);
 270         rc = __blk_end_request(req, err, nr_bytes);
 271         if (rc)
 272                 return true;
 273         fs->cur_req = NULL;
 274         return false;
 275 }
 276
 277 static void swim3_select(struct floppy_state *fs, int sel)
 278 {
 279         struct swim3 __iomem *sw = fs->swim3;
 280
 281         out_8(&sw->select, RELAX);
 282         if (sel & 8)
 283                 out_8(&sw->control_bis, SELECT);
 284         else
 285                 out_8(&sw->control_bic, SELECT);
 286         out_8(&sw->select, sel & CA_MASK);
 287 }
 288
 289 static void swim3_action(struct floppy_state *fs, int action)
 290 {
 291         struct swim3 __iomem *sw = fs->swim3;
 292
 293         swim3_select(fs, action);
 294         udelay(1);
 295         out_8(&sw->select, sw->select | LSTRB);
 296         udelay(2);
 297         out_8(&sw->select, sw->select & ~LSTRB);
 298         udelay(1);
 299 }
 300
 301 static int swim3_readbit(struct floppy_state *fs, int bit)
 302 {
 303         struct swim3 __iomem *sw = fs->swim3;
 304         int stat;
 305
 306         swim3_select(fs, bit);
 307         udelay(1);
 308         stat = in_8(&sw->status);
 309         return (stat & DATA) == 0;
 310 }
 311
 312 static void start_request(struct floppy_state *fs)
 313 {
 314         struct request *req;
 315         unsigned long x;
 316
 317         swim3_dbg("start request, initial state=%d\n", fs->state);
 318
 319         if (fs->state == idle && fs->wanted) {
 320                 fs->state = available;
 321                 wake_up(&fs->wait);
 322                 return;
 323         }
 324         while (fs->state == idle) {
 325                 swim3_dbg("start request, idle loop, cur_req=%p\n", fs->cur_req);
 326                 if (!fs->cur_req) {
 327                         fs->cur_req = blk_fetch_request(disks[fs->index]->queue);
 328                         swim3_dbg("  fetched request %p\n", fs->cur_req);
 329                         if (!fs->cur_req)
 330                                 break;
 331                 }
 332                 req = fs->cur_req;
 333
 334                 if (fs->mdev->media_bay &&
 335                     check_media_bay(fs->mdev->media_bay) != MB_FD) {
 336                         swim3_dbg("%s", "  media bay absent, dropping req\n");
 337                         swim3_end_request(fs, BLK_STS_IOERR, 0);
 338                         continue;
 339                 }
 340
 341 #if 0 /* This is really too verbose */
 342                 swim3_dbg("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n",
 343                           req->rq_disk->disk_name, req->cmd,
 344                           (long)blk_rq_pos(req), blk_rq_sectors(req),
 345                           bio_data(req->bio));
 346                 swim3_dbg("           current_nr_sectors=%u\n",
 347                           blk_rq_cur_sectors(req));
 348 #endif
 349
 350                 if (blk_rq_pos(req) >= fs->total_secs) {
 351                         swim3_dbg("  pos out of bounds (%ld, max is %ld)\n",
 352                                   (long)blk_rq_pos(req), (long)fs->total_secs);
 353                         swim3_end_request(fs, BLK_STS_IOERR, 0);
 354                         continue;
 355                 }
 356                 if (fs->ejected) {
 357                         swim3_dbg("%s", "  disk ejected\n");
 358                         swim3_end_request(fs, BLK_STS_IOERR, 0);
 359                         continue;
 360                 }
 361
 362                 if (rq_data_dir(req) == WRITE) {
 363                         if (fs->write_prot < 0)
 364                                 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 365                         if (fs->write_prot) {
 366                                 swim3_dbg("%s", "  try to write, disk write protected\n");
 367                                 swim3_end_request(fs, BLK_STS_IOERR, 0);
 368                                 continue;
 369                         }
 370                 }
 371
 372                 /* Do not remove the cast. blk_rq_pos(req) is now a
 373                  * sector_t and can be 64 bits, but it will never go
 374                  * past 32 bits for this driver anyway, so we can
 375                  * safely cast it down and not have to do a 64/32
 376                  * division
 377                  */
 378                 fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl;
 379                 x = ((long)blk_rq_pos(req)) % fs->secpercyl;
 380                 fs->head = x / fs->secpertrack;
 381                 fs->req_sector = x % fs->secpertrack + 1;
 382                 fs->state = do_transfer;
 383                 fs->retries = 0;
 384
 385                 act(fs);
 386         }
 387 }
 388
 389 static void do_fd_request(struct request_queue * q)
 390 {
 391         start_request(q->queuedata);
 392 }
 393
 394 static void set_timeout(struct floppy_state *fs, int nticks,
 395                         void (*proc)(struct timer_list *t))
 396 {
 397         if (fs->timeout_pending)
 398                 del_timer(&fs->timeout);
 399         fs->timeout.expires = jiffies + nticks;
 400         fs->timeout.function = proc;
 401         add_timer(&fs->timeout);
 402         fs->timeout_pending = 1;
 403 }
 404
 405 static inline void scan_track(struct floppy_state *fs)
 406 {
 407         struct swim3 __iomem *sw = fs->swim3;
 408
 409         swim3_select(fs, READ_DATA_0);
 410         in_8(&sw->intr);                /* clear SEEN_SECTOR bit */
 411         in_8(&sw->error);
 412         out_8(&sw->intr_enable, SEEN_SECTOR);
 413         out_8(&sw->control_bis, DO_ACTION);
 414         /* enable intr when track found */
 415         set_timeout(fs, HZ, scan_timeout);      /* enable timeout */
 416 }
 417
 418 static inline void seek_track(struct floppy_state *fs, int n)
 419 {
 420         struct swim3 __iomem *sw = fs->swim3;
 421
 422         if (n >= 0) {
 423                 swim3_action(fs, SEEK_POSITIVE);
 424                 sw->nseek = n;
 425         } else {
 426                 swim3_action(fs, SEEK_NEGATIVE);
 427                 sw->nseek = -n;
 428         }
 429         fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
 430         swim3_select(fs, STEP);
 431         in_8(&sw->error);
 432         /* enable intr when seek finished */
 433         out_8(&sw->intr_enable, SEEK_DONE);
 434         out_8(&sw->control_bis, DO_SEEK);
 435         set_timeout(fs, 3*HZ, seek_timeout);    /* enable timeout */
 436         fs->settle_time = 0;
 437 }
 438
 439 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
 440                             void *buf, int count)
 441 {
 442         cp->req_count = cpu_to_le16(count);
 443         cp->command = cpu_to_le16(cmd);
 444         cp->phy_addr = cpu_to_le32(virt_to_bus(buf));
 445         cp->xfer_status = 0;
 446 }
 447
 448 static inline void setup_transfer(struct floppy_state *fs)
 449 {
 450         int n;
 451         struct swim3 __iomem *sw = fs->swim3;
 452         struct dbdma_cmd *cp = fs->dma_cmd;
 453         struct dbdma_regs __iomem *dr = fs->dma;
 454         struct request *req = fs->cur_req;
 455
 456         if (blk_rq_cur_sectors(req) <= 0) {
 457                 swim3_warn("%s", "Transfer 0 sectors ?\n");
 458                 return;
 459         }
 460         if (rq_data_dir(req) == WRITE)
 461                 n = 1;
 462         else {
 463                 n = fs->secpertrack - fs->req_sector + 1;
 464                 if (n > blk_rq_cur_sectors(req))
 465                         n = blk_rq_cur_sectors(req);
 466         }
 467
 468         swim3_dbg("  setup xfer at sect %d (of %d) head %d for %d\n",
 469                   fs->req_sector, fs->secpertrack, fs->head, n);
 470
 471         fs->scount = n;
 472         swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
 473         out_8(&sw->sector, fs->req_sector);
 474         out_8(&sw->nsect, n);
 475         out_8(&sw->gap3, 0);
 476         out_le32(&dr->cmdptr, virt_to_bus(cp));
 477         if (rq_data_dir(req) == WRITE) {
 478                 /* Set up 3 dma commands: write preamble, data, postamble */
 479                 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
 480                 ++cp;
 481                 init_dma(cp, OUTPUT_MORE, bio_data(req->bio), 512);
 482                 ++cp;
 483                 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
 484         } else {
 485                 init_dma(cp, INPUT_LAST, bio_data(req->bio), n * 512);
 486         }
 487         ++cp;
 488         out_le16(&cp->command, DBDMA_STOP);
 489         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 490         in_8(&sw->error);
 491         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 492         if (rq_data_dir(req) == WRITE)
 493                 out_8(&sw->control_bis, WRITE_SECTORS);
 494         in_8(&sw->intr);
 495         out_le32(&dr->control, (RUN << 16) | RUN);
 496         /* enable intr when transfer complete */
 497         out_8(&sw->intr_enable, TRANSFER_DONE);
 498         out_8(&sw->control_bis, DO_ACTION);
 499         set_timeout(fs, 2*HZ, xfer_timeout);    /* enable timeout */
 500 }
 501
 502 static void act(struct floppy_state *fs)
 503 {
 504         for (;;) {
 505                 swim3_dbg("  act loop, state=%d, req_cyl=%d, cur_cyl=%d\n",
 506                           fs->state, fs->req_cyl, fs->cur_cyl);
 507
 508                 switch (fs->state) {
 509                 case idle:
 510                         return;         /* XXX shouldn't get here */
 511
 512                 case locating:
 513                         if (swim3_readbit(fs, TRACK_ZERO)) {
 514                                 swim3_dbg("%s", "    locate track 0\n");
 515                                 fs->cur_cyl = 0;
 516                                 if (fs->req_cyl == 0)
 517                                         fs->state = do_transfer;
 518                                 else
 519                                         fs->state = seeking;
 520                                 break;
 521                         }
 522                         scan_track(fs);
 523                         return;
 524
 525                 case seeking:
 526                         if (fs->cur_cyl < 0) {
 527                                 fs->expect_cyl = -1;
 528                                 fs->state = locating;
 529                                 break;
 530                         }
 531                         if (fs->req_cyl == fs->cur_cyl) {
 532                                 swim3_warn("%s", "Whoops, seeking 0\n");
 533                                 fs->state = do_transfer;
 534                                 break;
 535                         }
 536                         seek_track(fs, fs->req_cyl - fs->cur_cyl);
 537                         return;
 538
 539                 case settling:
 540                         /* check for SEEK_COMPLETE after 30ms */
 541                         fs->settle_time = (HZ + 32) / 33;
 542                         set_timeout(fs, fs->settle_time, settle_timeout);
 543                         return;
 544
 545                 case do_transfer:
 546                         if (fs->cur_cyl != fs->req_cyl) {
 547                                 if (fs->retries > 5) {
 548                                         swim3_err("Wrong cylinder in transfer, want: %d got %d\n",
 549                                                   fs->req_cyl, fs->cur_cyl);
 550                                         swim3_end_request(fs, BLK_STS_IOERR, 0);
 551                                         fs->state = idle;
 552                                         return;
 553                                 }
 554                                 fs->state = seeking;
 555                                 break;
 556                         }
 557                         setup_transfer(fs);
 558                         return;
 559
 560                 case jogging:
 561                         seek_track(fs, -5);
 562                         return;
 563
 564                 default:
 565                         swim3_err("Unknown state %d\n", fs->state);
 566                         return;
 567                 }
 568         }
 569 }
 570
 571 static void scan_timeout(struct timer_list *t)
 572 {
 573         struct floppy_state *fs = from_timer(fs, t, timeout);
 574         struct swim3 __iomem *sw = fs->swim3;
 575         unsigned long flags;
 576
 577         swim3_dbg("* scan timeout, state=%d\n", fs->state);
 578
 579         spin_lock_irqsave(&swim3_lock, flags);
 580         fs->timeout_pending = 0;
 581         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 582         out_8(&sw->select, RELAX);
 583         out_8(&sw->intr_enable, 0);
 584         fs->cur_cyl = -1;
 585         if (fs->retries > 5) {
 586                 swim3_end_request(fs, BLK_STS_IOERR, 0);
 587                 fs->state = idle;
 588                 start_request(fs);
 589         } else {
 590                 fs->state = jogging;
 591                 act(fs);
 592         }
 593         spin_unlock_irqrestore(&swim3_lock, flags);
 594 }
 595
 596 static void seek_timeout(struct timer_list *t)
 597 {
 598         struct floppy_state *fs = from_timer(fs, t, timeout);
 599         struct swim3 __iomem *sw = fs->swim3;
 600         unsigned long flags;
 601
 602         swim3_dbg("* seek timeout, state=%d\n", fs->state);
 603
 604         spin_lock_irqsave(&swim3_lock, flags);
 605         fs->timeout_pending = 0;
 606         out_8(&sw->control_bic, DO_SEEK);
 607         out_8(&sw->select, RELAX);
 608         out_8(&sw->intr_enable, 0);
 609         swim3_err("%s", "Seek timeout\n");
 610         swim3_end_request(fs, BLK_STS_IOERR, 0);
 611         fs->state = idle;
 612         start_request(fs);
 613         spin_unlock_irqrestore(&swim3_lock, flags);
 614 }
 615
 616 static void settle_timeout(struct timer_list *t)
 617 {
 618         struct floppy_state *fs = from_timer(fs, t, timeout);
 619         struct swim3 __iomem *sw = fs->swim3;
 620         unsigned long flags;
 621
 622         swim3_dbg("* settle timeout, state=%d\n", fs->state);
 623
 624         spin_lock_irqsave(&swim3_lock, flags);
 625         fs->timeout_pending = 0;
 626         if (swim3_readbit(fs, SEEK_COMPLETE)) {
 627                 out_8(&sw->select, RELAX);
 628                 fs->state = locating;
 629                 act(fs);
 630                 goto unlock;
 631         }
 632         out_8(&sw->select, RELAX);
 633         if (fs->settle_time < 2*HZ) {
 634                 ++fs->settle_time;
 635                 set_timeout(fs, 1, settle_timeout);
 636                 goto unlock;
 637         }
 638         swim3_err("%s", "Seek settle timeout\n");
 639         swim3_end_request(fs, BLK_STS_IOERR, 0);
 640         fs->state = idle;
 641         start_request(fs);
 642  unlock:
 643         spin_unlock_irqrestore(&swim3_lock, flags);
 644 }
 645
 646 static void xfer_timeout(struct timer_list *t)
 647 {
 648         struct floppy_state *fs = from_timer(fs, t, timeout);
 649         struct swim3 __iomem *sw = fs->swim3;
 650         struct dbdma_regs __iomem *dr = fs->dma;
 651         unsigned long flags;
 652         int n;
 653
 654         swim3_dbg("* xfer timeout, state=%d\n", fs->state);
 655
 656         spin_lock_irqsave(&swim3_lock, flags);
 657         fs->timeout_pending = 0;
 658         out_le32(&dr->control, RUN << 16);
 659         /* We must wait a bit for dbdma to stop */
 660         for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
 661                 udelay(1);
 662         out_8(&sw->intr_enable, 0);
 663         out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 664         out_8(&sw->select, RELAX);
 665         swim3_err("Timeout %sing sector %ld\n",
 666                (rq_data_dir(fs->cur_req)==WRITE? "writ": "read"),
 667                (long)blk_rq_pos(fs->cur_req));
 668         swim3_end_request(fs, BLK_STS_IOERR, 0);
 669         fs->state = idle;
 670         start_request(fs);
 671         spin_unlock_irqrestore(&swim3_lock, flags);
 672 }
 673
 674 static irqreturn_t swim3_interrupt(int irq, void *dev_id)
 675 {
 676         struct floppy_state *fs = (struct floppy_state *) dev_id;
 677         struct swim3 __iomem *sw = fs->swim3;
 678         int intr, err, n;
 679         int stat, resid;
 680         struct dbdma_regs __iomem *dr;
 681         struct dbdma_cmd *cp;
 682         unsigned long flags;
 683         struct request *req = fs->cur_req;
 684
 685         swim3_dbg("* interrupt, state=%d\n", fs->state);
 686
 687         spin_lock_irqsave(&swim3_lock, flags);
 688         intr = in_8(&sw->intr);
 689         err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
 690         if ((intr & ERROR_INTR) && fs->state != do_transfer)
 691                 swim3_err("Non-transfer error interrupt: state=%d, dir=%x, intr=%x, err=%x\n",
 692                           fs->state, rq_data_dir(req), intr, err);
 693         switch (fs->state) {
 694         case locating:
 695                 if (intr & SEEN_SECTOR) {
 696                         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 697                         out_8(&sw->select, RELAX);
 698                         out_8(&sw->intr_enable, 0);
 699                         del_timer(&fs->timeout);
 700                         fs->timeout_pending = 0;
 701                         if (sw->ctrack == 0xff) {
 702                                 swim3_err("%s", "Seen sector but cyl=ff?\n");
 703                                 fs->cur_cyl = -1;
 704                                 if (fs->retries > 5) {
 705                                         swim3_end_request(fs, BLK_STS_IOERR, 0);
 706                                         fs->state = idle;
 707                                         start_request(fs);
 708                                 } else {
 709                                         fs->state = jogging;
 710                                         act(fs);
 711                                 }
 712                                 break;
 713                         }
 714                         fs->cur_cyl = sw->ctrack;
 715                         fs->cur_sector = sw->csect;
 716                         if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
 717                                 swim3_err("Expected cyl %d, got %d\n",
 718                                           fs->expect_cyl, fs->cur_cyl);
 719                         fs->state = do_transfer;
 720                         act(fs);
 721                 }
 722                 break;
 723         case seeking:
 724         case jogging:
 725                 if (sw->nseek == 0) {
 726                         out_8(&sw->control_bic, DO_SEEK);
 727                         out_8(&sw->select, RELAX);
 728                         out_8(&sw->intr_enable, 0);
 729                         del_timer(&fs->timeout);
 730                         fs->timeout_pending = 0;
 731                         if (fs->state == seeking)
 732                                 ++fs->retries;
 733                         fs->state = settling;
 734                         act(fs);
 735                 }
 736                 break;
 737         case settling:
 738                 out_8(&sw->intr_enable, 0);
 739                 del_timer(&fs->timeout);
 740                 fs->timeout_pending = 0;
 741                 act(fs);
 742                 break;
 743         case do_transfer:
 744                 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
 745                         break;
 746                 out_8(&sw->intr_enable, 0);
 747                 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 748                 out_8(&sw->select, RELAX);
 749                 del_timer(&fs->timeout);
 750                 fs->timeout_pending = 0;
 751                 dr = fs->dma;
 752                 cp = fs->dma_cmd;
 753                 if (rq_data_dir(req) == WRITE)
 754                         ++cp;
 755                 /*
 756                  * Check that the main data transfer has finished.
 757                  * On writing, the swim3 sometimes doesn't use
 758                  * up all the bytes of the postamble, so we can still
 759                  * see DMA active here.  That doesn't matter as long
 760                  * as all the sector data has been transferred.
 761                  */
 762                 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
 763                         /* wait a little while for DMA to complete */
 764                         for (n = 0; n < 100; ++n) {
 765                                 if (cp->xfer_status != 0)
 766                                         break;
 767                                 udelay(1);
 768                                 barrier();
 769                         }
 770                 }
 771                 /* turn off DMA */
 772                 out_le32(&dr->control, (RUN | PAUSE) << 16);
 773                 stat = le16_to_cpu(cp->xfer_status);
 774                 resid = le16_to_cpu(cp->res_count);
 775                 if (intr & ERROR_INTR) {
 776                         n = fs->scount - 1 - resid / 512;
 777                         if (n > 0) {
 778                                 blk_update_request(req, 0, n << 9);
 779                                 fs->req_sector += n;
 780                         }
 781                         if (fs->retries < 5) {
 782                                 ++fs->retries;
 783                                 act(fs);
 784                         } else {
 785                                 swim3_err("Error %sing block %ld (err=%x)\n",
 786                                        rq_data_dir(req) == WRITE? "writ": "read",
 787                                        (long)blk_rq_pos(req), err);
 788                                 swim3_end_request(fs, BLK_STS_IOERR, 0);
 789                                 fs->state = idle;
 790                         }
 791                 } else {
 792                         if ((stat & ACTIVE) == 0 || resid != 0) {
 793                                 /* musta been an error */
 794                                 swim3_err("fd dma error: stat=%x resid=%d\n", stat, resid);
 795                                 swim3_err("  state=%d, dir=%x, intr=%x, err=%x\n",
 796                                           fs->state, rq_data_dir(req), intr, err);
 797                                 swim3_end_request(fs, BLK_STS_IOERR, 0);
 798                                 fs->state = idle;
 799                                 start_request(fs);
 800                                 break;
 801                         }
 802                         fs->retries = 0;
 803                         if (swim3_end_request(fs, 0, fs->scount << 9)) {
 804                                 fs->req_sector += fs->scount;
 805                                 if (fs->req_sector > fs->secpertrack) {
 806                                         fs->req_sector -= fs->secpertrack;
 807                                         if (++fs->head > 1) {
 808                                                 fs->head = 0;
 809                                                 ++fs->req_cyl;
 810                                         }
 811                                 }
 812                                 act(fs);
 813                         } else
 814                                 fs->state = idle;
 815                 }
 816                 if (fs->state == idle)
 817                         start_request(fs);
 818                 break;
 819         default:
 820                 swim3_err("Don't know what to do in state %d\n", fs->state);
 821         }
 822         spin_unlock_irqrestore(&swim3_lock, flags);
 823         return IRQ_HANDLED;
 824 }
 825
 826 /*
 827 static void fd_dma_interrupt(int irq, void *dev_id)
 828 {
 829 }
 830 */
 831
 832 /* Called under the mutex to grab exclusive access to a drive */
 833 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 834                       int interruptible)
 835 {
 836         unsigned long flags;
 837
 838         swim3_dbg("%s", "-> grab drive\n");
 839
 840         spin_lock_irqsave(&swim3_lock, flags);
 841         if (fs->state != idle && fs->state != available) {
 842                 ++fs->wanted;
 843                 /* this will enable irqs in order to sleep */
 844                 if (!interruptible)
 845                         wait_event_lock_irq(fs->wait,
 846                                         fs->state == available,
 847                                         swim3_lock);
 848                 else if (wait_event_interruptible_lock_irq(fs->wait,
 849                                         fs->state == available,
 850                                         swim3_lock)) {
 851                         --fs->wanted;
 852                         spin_unlock_irqrestore(&swim3_lock, flags);
 853                         return -EINTR;
 854                 }
 855                 --fs->wanted;
 856         }
 857         fs->state = state;
 858         spin_unlock_irqrestore(&swim3_lock, flags);
 859
 860         return 0;
 861 }
 862
 863 static void release_drive(struct floppy_state *fs)
 864 {
 865         unsigned long flags;
 866
 867         swim3_dbg("%s", "-> release drive\n");
 868
 869         spin_lock_irqsave(&swim3_lock, flags);
 870         fs->state = idle;
 871         start_request(fs);
 872         spin_unlock_irqrestore(&swim3_lock, flags);
 873 }
 874
 875 static int fd_eject(struct floppy_state *fs)
 876 {
 877         int err, n;
 878
 879         err = grab_drive(fs, ejecting, 1);
 880         if (err)
 881                 return err;
 882         swim3_action(fs, EJECT);
 883         for (n = 20; n > 0; --n) {
 884                 if (signal_pending(current)) {
 885                         err = -EINTR;
 886                         break;
 887                 }
 888                 swim3_select(fs, RELAX);
 889                 schedule_timeout_interruptible(1);
 890                 if (swim3_readbit(fs, DISK_IN) == 0)
 891                         break;
 892         }
 893         swim3_select(fs, RELAX);
 894         udelay(150);
 895         fs->ejected = 1;
 896         release_drive(fs);
 897         return err;
 898 }
 899
 900 static struct floppy_struct floppy_type =
 901         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL };    /*  7 1.44MB 3.5"   */
 902
 903 static int floppy_locked_ioctl(struct block_device *bdev, fmode_t mode,
 904                         unsigned int cmd, unsigned long param)
 905 {
 906         struct floppy_state *fs = bdev->bd_disk->private_data;
 907         int err;
 908
 909         if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
 910                 return -EPERM;
 911
 912         if (fs->mdev->media_bay &&
 913             check_media_bay(fs->mdev->media_bay) != MB_FD)
 914                 return -ENXIO;
 915
 916         switch (cmd) {
 917         case FDEJECT:
 918                 if (fs->ref_count != 1)
 919                         return -EBUSY;
 920                 err = fd_eject(fs);
 921                 return err;
 922         case FDGETPRM:
 923                 if (copy_to_user((void __user *) param, &floppy_type,
 924                                  sizeof(struct floppy_struct)))
 925                         return -EFAULT;
 926                 return 0;
 927         }
 928         return -ENOTTY;
 929 }
 930
 931 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
 932                                  unsigned int cmd, unsigned long param)
 933 {
 934         int ret;
 935
 936         mutex_lock(&swim3_mutex);
 937         ret = floppy_locked_ioctl(bdev, mode, cmd, param);
 938         mutex_unlock(&swim3_mutex);
 939
 940         return ret;
 941 }
 942
 943 static int floppy_open(struct block_device *bdev, fmode_t mode)
 944 {
 945         struct floppy_state *fs = bdev->bd_disk->private_data;
 946         struct swim3 __iomem *sw = fs->swim3;
 947         int n, err = 0;
 948
 949         if (fs->ref_count == 0) {
 950                 if (fs->mdev->media_bay &&
 951                     check_media_bay(fs->mdev->media_bay) != MB_FD)
 952                         return -ENXIO;
 953                 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
 954                 out_8(&sw->control_bic, 0xff);
 955                 out_8(&sw->mode, 0x95);
 956                 udelay(10);
 957                 out_8(&sw->intr_enable, 0);
 958                 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
 959                 swim3_action(fs, MOTOR_ON);
 960                 fs->write_prot = -1;
 961                 fs->cur_cyl = -1;
 962                 for (n = 0; n < 2 * HZ; ++n) {
 963                         if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
 964                                 break;
 965                         if (signal_pending(current)) {
 966                                 err = -EINTR;
 967                                 break;
 968                         }
 969                         swim3_select(fs, RELAX);
 970                         schedule_timeout_interruptible(1);
 971                 }
 972                 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
 973                                  || swim3_readbit(fs, DISK_IN) == 0))
 974                         err = -ENXIO;
 975                 swim3_action(fs, SETMFM);
 976                 swim3_select(fs, RELAX);
 977
 978         } else if (fs->ref_count == -1 || mode & FMODE_EXCL)
 979                 return -EBUSY;
 980
 981         if (err == 0 && (mode & FMODE_NDELAY) == 0
 982             && (mode & (FMODE_READ|FMODE_WRITE))) {
 983                 check_disk_change(bdev);
 984                 if (fs->ejected)
 985                         err = -ENXIO;
 986         }
 987
 988         if (err == 0 && (mode & FMODE_WRITE)) {
 989                 if (fs->write_prot < 0)
 990                         fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 991                 if (fs->write_prot)
 992                         err = -EROFS;
 993         }
 994
 995         if (err) {
 996                 if (fs->ref_count == 0) {
 997                         swim3_action(fs, MOTOR_OFF);
 998                         out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
 999                         swim3_select(fs, RELAX);
1000                 }
1001                 return err;
1002         }
1003
1004         if (mode & FMODE_EXCL)
1005                 fs->ref_count = -1;
1006         else
1007                 ++fs->ref_count;
1008
1009         return 0;
1010 }
1011
1012 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
1013 {
1014         int ret;
1015
1016         mutex_lock(&swim3_mutex);
1017         ret = floppy_open(bdev, mode);
1018         mutex_unlock(&swim3_mutex);
1019
1020         return ret;
1021 }
1022
1023 static void floppy_release(struct gendisk *disk, fmode_t mode)
1024 {
1025         struct floppy_state *fs = disk->private_data;
1026         struct swim3 __iomem *sw = fs->swim3;
1027
1028         mutex_lock(&swim3_mutex);
1029         if (fs->ref_count > 0)
1030                 --fs->ref_count;
1031         else if (fs->ref_count == -1)
1032                 fs->ref_count = 0;
1033         if (fs->ref_count == 0) {
1034                 swim3_action(fs, MOTOR_OFF);
1035                 out_8(&sw->control_bic, 0xff);
1036                 swim3_select(fs, RELAX);
1037         }
1038         mutex_unlock(&swim3_mutex);
1039 }
1040
1041 static unsigned int floppy_check_events(struct gendisk *disk,
1042                                         unsigned int clearing)
1043 {
1044         struct floppy_state *fs = disk->private_data;
1045         return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0;
1046 }
1047
1048 static int floppy_revalidate(struct gendisk *disk)
1049 {
1050         struct floppy_state *fs = disk->private_data;
1051         struct swim3 __iomem *sw;
1052         int ret, n;
1053
1054         if (fs->mdev->media_bay &&
1055             check_media_bay(fs->mdev->media_bay) != MB_FD)
1056                 return -ENXIO;
1057
1058         sw = fs->swim3;
1059         grab_drive(fs, revalidating, 0);
1060         out_8(&sw->intr_enable, 0);
1061         out_8(&sw->control_bis, DRIVE_ENABLE);
1062         swim3_action(fs, MOTOR_ON);     /* necessary? */
1063         fs->write_prot = -1;
1064         fs->cur_cyl = -1;
1065         mdelay(1);
1066         for (n = HZ; n > 0; --n) {
1067                 if (swim3_readbit(fs, SEEK_COMPLETE))
1068                         break;
1069                 if (signal_pending(current))
1070                         break;
1071                 swim3_select(fs, RELAX);
1072                 schedule_timeout_interruptible(1);
1073         }
1074         ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
1075                 || swim3_readbit(fs, DISK_IN) == 0;
1076         if (ret)
1077                 swim3_action(fs, MOTOR_OFF);
1078         else {
1079                 fs->ejected = 0;
1080                 swim3_action(fs, SETMFM);
1081         }
1082         swim3_select(fs, RELAX);
1083
1084         release_drive(fs);
1085         return ret;
1086 }
1087
1088 static const struct block_device_operations floppy_fops = {
1089         .open           = floppy_unlocked_open,
1090         .release        = floppy_release,
1091         .ioctl          = floppy_ioctl,
1092         .check_events   = floppy_check_events,
1093         .revalidate_disk= floppy_revalidate,
1094 };
1095
1096 static void swim3_mb_event(struct macio_dev* mdev, int mb_state)
1097 {
1098         struct floppy_state *fs = macio_get_drvdata(mdev);
1099         struct swim3 __iomem *sw;
1100
1101         if (!fs)
1102                 return;
1103
1104         sw = fs->swim3;
1105
1106         if (mb_state != MB_FD)
1107                 return;
1108
1109         /* Clear state */
1110         out_8(&sw->intr_enable, 0);
1111         in_8(&sw->intr);
1112         in_8(&sw->error);
1113 }
1114
1115 static int swim3_add_device(struct macio_dev *mdev, int index)
1116 {
1117         struct device_node *swim = mdev->ofdev.dev.of_node;
1118         struct floppy_state *fs = &floppy_states[index];
1119         int rc = -EBUSY;
1120
1121         /* Do this first for message macros */
1122         memset(fs, 0, sizeof(*fs));
1123         fs->mdev = mdev;
1124         fs->index = index;
1125
1126         /* Check & Request resources */
1127         if (macio_resource_count(mdev) < 2) {
1128                 swim3_err("%s", "No address in device-tree\n");
1129                 return -ENXIO;
1130         }
1131         if (macio_irq_count(mdev) < 1) {
1132                 swim3_err("%s", "No interrupt in device-tree\n");
1133                 return -ENXIO;
1134         }
1135         if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
1136                 swim3_err("%s", "Can't request mmio resource\n");
1137                 return -EBUSY;
1138         }
1139         if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
1140                 swim3_err("%s", "Can't request dma resource\n");
1141                 macio_release_resource(mdev, 0);
1142                 return -EBUSY;
1143         }
1144         dev_set_drvdata(&mdev->ofdev.dev, fs);
1145
1146         if (mdev->media_bay == NULL)
1147                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1148
1149         fs->state = idle;
1150         fs->swim3 = (struct swim3 __iomem *)
1151                 ioremap(macio_resource_start(mdev, 0), 0x200);
1152         if (fs->swim3 == NULL) {
1153                 swim3_err("%s", "Couldn't map mmio registers\n");
1154                 rc = -ENOMEM;
1155                 goto out_release;
1156         }
1157         fs->dma = (struct dbdma_regs __iomem *)
1158                 ioremap(macio_resource_start(mdev, 1), 0x200);
1159         if (fs->dma == NULL) {
1160                 swim3_err("%s", "Couldn't map dma registers\n");
1161                 iounmap(fs->swim3);
1162                 rc = -ENOMEM;
1163                 goto out_release;
1164         }
1165         fs->swim3_intr = macio_irq(mdev, 0);
1166         fs->dma_intr = macio_irq(mdev, 1);
1167         fs->cur_cyl = -1;
1168         fs->cur_sector = -1;
1169         fs->secpercyl = 36;
1170         fs->secpertrack = 18;
1171         fs->total_secs = 2880;
1172         init_waitqueue_head(&fs->wait);
1173
1174         fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1175         memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1176         fs->dma_cmd[1].command = cpu_to_le16(DBDMA_STOP);
1177
1178         if (mdev->media_bay == NULL || check_media_bay(mdev->media_bay) == MB_FD)
1179                 swim3_mb_event(mdev, MB_FD);
1180
1181         if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1182                 swim3_err("%s", "Couldn't request interrupt\n");
1183                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1184                 goto out_unmap;
1185                 return -EBUSY;
1186         }
1187
1188         timer_setup(&fs->timeout, NULL, 0);
1189
1190         swim3_info("SWIM3 floppy controller %s\n",
1191                 mdev->media_bay ? "in media bay" : "");
1192
1193         return 0;
1194
1195  out_unmap:
1196         iounmap(fs->dma);
1197         iounmap(fs->swim3);
1198
1199  out_release:
1200         macio_release_resource(mdev, 0);
1201         macio_release_resource(mdev, 1);
1202
1203         return rc;
1204 }
1205
1206 static int swim3_attach(struct macio_dev *mdev,
1207                         const struct of_device_id *match)
1208 {
1209         struct gendisk *disk;
1210         int index, rc;
1211
1212         index = floppy_count++;
1213         if (index >= MAX_FLOPPIES)
1214                 return -ENXIO;
1215
1216         /* Add the drive */
1217         rc = swim3_add_device(mdev, index);
1218         if (rc)
1219                 return rc;
1220         /* Now register that disk. Same comment about failure handling */
1221         disk = disks[index] = alloc_disk(1);
1222         if (disk == NULL)
1223                 return -ENOMEM;
1224         disk->queue = blk_init_queue(do_fd_request, &swim3_lock);
1225         if (disk->queue == NULL) {
1226                 put_disk(disk);
1227                 return -ENOMEM;
1228         }
1229         blk_queue_bounce_limit(disk->queue, BLK_BOUNCE_HIGH);
1230         disk->queue->queuedata = &floppy_states[index];
1231
1232         if (index == 0) {
1233                 /* If we failed, there isn't much we can do as the driver is still
1234                  * too dumb to remove the device, just bail out
1235                  */
1236                 if (register_blkdev(FLOPPY_MAJOR, "fd"))
1237                         return 0;
1238         }
1239
1240         disk->major = FLOPPY_MAJOR;
1241         disk->first_minor = index;
1242         disk->fops = &floppy_fops;
1243         disk->private_data = &floppy_states[index];
1244         disk->flags |= GENHD_FL_REMOVABLE;
1245         sprintf(disk->disk_name, "fd%d", index);
1246         set_capacity(disk, 2880);
1247         add_disk(disk);
1248
1249         return 0;
1250 }
1251
1252 static const struct of_device_id swim3_match[] =
1253 {
1254         {
1255         .name           = "swim3",
1256         },
1257         {
1258         .compatible     = "ohare-swim3"
1259         },
1260         {
1261         .compatible     = "swim3"
1262         },
1263         { /* end of list */ }
1264 };
1265
1266 static struct macio_driver swim3_driver =
1267 {
1268         .driver = {
1269                 .name           = "swim3",
1270                 .of_match_table = swim3_match,
1271         },
1272         .probe          = swim3_attach,
1273 #ifdef CONFIG_PMAC_MEDIABAY
1274         .mediabay_event = swim3_mb_event,
1275 #endif
1276 #if 0
1277         .suspend        = swim3_suspend,
1278         .resume         = swim3_resume,
1279 #endif
1280 };
1281
1282
1283 int swim3_init(void)
1284 {
1285         macio_register_driver(&swim3_driver);
1286         return 0;
1287 }
1288
1289 module_init(swim3_init)
1290
1291 MODULE_LICENSE("GPL");
1292 MODULE_AUTHOR("Paul Mackerras");
1293 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);