SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 #include <linux/stddef.h>
  20 #include <linux/kernel.h>
  21 #include <linux/sched.h>
  22 #include <linux/timer.h>
  23 #include <linux/delay.h>
  24 #include <linux/fd.h>
  25 #include <linux/ioctl.h>
  26 #include <linux/blkdev.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/module.h>
  29 #include <linux/spinlock.h>
  30 #include <asm/io.h>
  31 #include <asm/dbdma.h>
  32 #include <asm/prom.h>
  33 #include <asm/uaccess.h>
  34 #include <asm/mediabay.h>
  35 #include <asm/machdep.h>
  36 #include <asm/pmac_feature.h>
  37
  38 static struct request_queue *swim3_queue;
  39 static struct gendisk *disks[2];
  40 static struct request *fd_req;
  41
  42 #define MAX_FLOPPIES    2
  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 TWOMEG_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 MFM_MODE        13
 157 #define SEEK_COMPLETE   14
 158 #define ONEMEG_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         spinlock_t lock;
 179         struct swim3 __iomem *swim3;    /* hardware registers */
 180         struct dbdma_regs __iomem *dma; /* DMA controller registers */
 181         int     swim3_intr;     /* interrupt number for SWIM3 */
 182         int     dma_intr;       /* interrupt number for DMA channel */
 183         int     cur_cyl;        /* cylinder head is on, or -1 */
 184         int     cur_sector;     /* last sector we saw go past */
 185         int     req_cyl;        /* the cylinder for the current r/w request */
 186         int     head;           /* head number ditto */
 187         int     req_sector;     /* sector number ditto */
 188         int     scount;         /* # sectors we're transferring at present */
 189         int     retries;
 190         int     settle_time;
 191         int     secpercyl;      /* disk geometry information */
 192         int     secpertrack;
 193         int     total_secs;
 194         int     write_prot;     /* 1 if write-protected, 0 if not, -1 dunno */
 195         struct dbdma_cmd *dma_cmd;
 196         int     ref_count;
 197         int     expect_cyl;
 198         struct timer_list timeout;
 199         int     timeout_pending;
 200         int     ejected;
 201         wait_queue_head_t wait;
 202         int     wanted;
 203         struct device_node*     media_bay; /* NULL when not in bay */
 204         char    dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
 205 };
 206
 207 static struct floppy_state floppy_states[MAX_FLOPPIES];
 208 static int floppy_count = 0;
 209 static DEFINE_SPINLOCK(swim3_lock);
 210
 211 static unsigned short write_preamble[] = {
 212         0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */
 213         0, 0, 0, 0, 0, 0,                       /* sync field */
 214         0x99a1, 0x99a1, 0x99a1, 0x99fb,         /* data address mark */
 215         0x990f                                  /* no escape for 512 bytes */
 216 };
 217
 218 static unsigned short write_postamble[] = {
 219         0x9904,                                 /* insert CRC */
 220         0x4e4e, 0x4e4e,
 221         0x9908,                                 /* stop writing */
 222         0, 0, 0, 0, 0, 0
 223 };
 224
 225 static void swim3_select(struct floppy_state *fs, int sel);
 226 static void swim3_action(struct floppy_state *fs, int action);
 227 static int swim3_readbit(struct floppy_state *fs, int bit);
 228 static void do_fd_request(struct request_queue * q);
 229 static void start_request(struct floppy_state *fs);
 230 static void set_timeout(struct floppy_state *fs, int nticks,
 231                         void (*proc)(unsigned long));
 232 static void scan_track(struct floppy_state *fs);
 233 static void seek_track(struct floppy_state *fs, int n);
 234 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count);
 235 static void setup_transfer(struct floppy_state *fs);
 236 static void act(struct floppy_state *fs);
 237 static void scan_timeout(unsigned long data);
 238 static void seek_timeout(unsigned long data);
 239 static void settle_timeout(unsigned long data);
 240 static void xfer_timeout(unsigned long data);
 241 static irqreturn_t swim3_interrupt(int irq, void *dev_id);
 242 /*static void fd_dma_interrupt(int irq, void *dev_id);*/
 243 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 244                       int interruptible);
 245 static void release_drive(struct floppy_state *fs);
 246 static int fd_eject(struct floppy_state *fs);
 247 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
 248                         unsigned int cmd, unsigned long param);
 249 static int floppy_open(struct block_device *bdev, fmode_t mode);
 250 static int floppy_release(struct gendisk *disk, fmode_t mode);
 251 static int floppy_check_change(struct gendisk *disk);
 252 static int floppy_revalidate(struct gendisk *disk);
 253
 254 static void swim3_select(struct floppy_state *fs, int sel)
 255 {
 256         struct swim3 __iomem *sw = fs->swim3;
 257
 258         out_8(&sw->select, RELAX);
 259         if (sel & 8)
 260                 out_8(&sw->control_bis, SELECT);
 261         else
 262                 out_8(&sw->control_bic, SELECT);
 263         out_8(&sw->select, sel & CA_MASK);
 264 }
 265
 266 static void swim3_action(struct floppy_state *fs, int action)
 267 {
 268         struct swim3 __iomem *sw = fs->swim3;
 269
 270         swim3_select(fs, action);
 271         udelay(1);
 272         out_8(&sw->select, sw->select | LSTRB);
 273         udelay(2);
 274         out_8(&sw->select, sw->select & ~LSTRB);
 275         udelay(1);
 276 }
 277
 278 static int swim3_readbit(struct floppy_state *fs, int bit)
 279 {
 280         struct swim3 __iomem *sw = fs->swim3;
 281         int stat;
 282
 283         swim3_select(fs, bit);
 284         udelay(1);
 285         stat = in_8(&sw->status);
 286         return (stat & DATA) == 0;
 287 }
 288
 289 static void do_fd_request(struct request_queue * q)
 290 {
 291         int i;
 292         for(i=0;i<floppy_count;i++)
 293         {
 294 #ifdef CONFIG_PMAC_MEDIABAY
 295                 if (floppy_states[i].media_bay &&
 296                         check_media_bay(floppy_states[i].media_bay, MB_FD))
 297                         continue;
 298 #endif /* CONFIG_PMAC_MEDIABAY */
 299                 start_request(&floppy_states[i]);
 300         }
 301 }
 302
 303 static void start_request(struct floppy_state *fs)
 304 {
 305         struct request *req;
 306         unsigned long x;
 307
 308         if (fs->state == idle && fs->wanted) {
 309                 fs->state = available;
 310                 wake_up(&fs->wait);
 311                 return;
 312         }
 313         while (fs->state == idle && (req = elv_next_request(swim3_queue))) {
 314 #if 0
 315                 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n",
 316                        req->rq_disk->disk_name, req->cmd,
 317                        (long)blk_rq_pos(req), blk_rq_sectors(req), req->buffer);
 318                 printk("           errors=%d current_nr_sectors=%u\n",
 319                        req->errors, blk_rq_cur_sectors(req));
 320 #endif
 321
 322                 if (blk_rq_pos(req) >= fs->total_secs) {
 323                         __blk_end_request_cur(req, -EIO);
 324                         continue;
 325                 }
 326                 if (fs->ejected) {
 327                         __blk_end_request_cur(req, -EIO);
 328                         continue;
 329                 }
 330
 331                 if (rq_data_dir(req) == WRITE) {
 332                         if (fs->write_prot < 0)
 333                                 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 334                         if (fs->write_prot) {
 335                                 __blk_end_request_cur(req, -EIO);
 336                                 continue;
 337                         }
 338                 }
 339
 340                 /* Do not remove the cast. blk_rq_pos(req) is now a
 341                  * sector_t and can be 64 bits, but it will never go
 342                  * past 32 bits for this driver anyway, so we can
 343                  * safely cast it down and not have to do a 64/32
 344                  * division
 345                  */
 346                 fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl;
 347                 x = ((long)blk_rq_pos(req)) % fs->secpercyl;
 348                 fs->head = x / fs->secpertrack;
 349                 fs->req_sector = x % fs->secpertrack + 1;
 350                 fd_req = req;
 351                 fs->state = do_transfer;
 352                 fs->retries = 0;
 353
 354                 act(fs);
 355         }
 356 }
 357
 358 static void set_timeout(struct floppy_state *fs, int nticks,
 359                         void (*proc)(unsigned long))
 360 {
 361         unsigned long flags;
 362
 363         spin_lock_irqsave(&fs->lock, flags);
 364         if (fs->timeout_pending)
 365                 del_timer(&fs->timeout);
 366         fs->timeout.expires = jiffies + nticks;
 367         fs->timeout.function = proc;
 368         fs->timeout.data = (unsigned long) fs;
 369         add_timer(&fs->timeout);
 370         fs->timeout_pending = 1;
 371         spin_unlock_irqrestore(&fs->lock, flags);
 372 }
 373
 374 static inline void scan_track(struct floppy_state *fs)
 375 {
 376         struct swim3 __iomem *sw = fs->swim3;
 377
 378         swim3_select(fs, READ_DATA_0);
 379         in_8(&sw->intr);                /* clear SEEN_SECTOR bit */
 380         in_8(&sw->error);
 381         out_8(&sw->intr_enable, SEEN_SECTOR);
 382         out_8(&sw->control_bis, DO_ACTION);
 383         /* enable intr when track found */
 384         set_timeout(fs, HZ, scan_timeout);      /* enable timeout */
 385 }
 386
 387 static inline void seek_track(struct floppy_state *fs, int n)
 388 {
 389         struct swim3 __iomem *sw = fs->swim3;
 390
 391         if (n >= 0) {
 392                 swim3_action(fs, SEEK_POSITIVE);
 393                 sw->nseek = n;
 394         } else {
 395                 swim3_action(fs, SEEK_NEGATIVE);
 396                 sw->nseek = -n;
 397         }
 398         fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
 399         swim3_select(fs, STEP);
 400         in_8(&sw->error);
 401         /* enable intr when seek finished */
 402         out_8(&sw->intr_enable, SEEK_DONE);
 403         out_8(&sw->control_bis, DO_SEEK);
 404         set_timeout(fs, 3*HZ, seek_timeout);    /* enable timeout */
 405         fs->settle_time = 0;
 406 }
 407
 408 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
 409                             void *buf, int count)
 410 {
 411         st_le16(&cp->req_count, count);
 412         st_le16(&cp->command, cmd);
 413         st_le32(&cp->phy_addr, virt_to_bus(buf));
 414         cp->xfer_status = 0;
 415 }
 416
 417 static inline void setup_transfer(struct floppy_state *fs)
 418 {
 419         int n;
 420         struct swim3 __iomem *sw = fs->swim3;
 421         struct dbdma_cmd *cp = fs->dma_cmd;
 422         struct dbdma_regs __iomem *dr = fs->dma;
 423
 424         if (blk_rq_cur_sectors(fd_req) <= 0) {
 425                 printk(KERN_ERR "swim3: transfer 0 sectors?\n");
 426                 return;
 427         }
 428         if (rq_data_dir(fd_req) == WRITE)
 429                 n = 1;
 430         else {
 431                 n = fs->secpertrack - fs->req_sector + 1;
 432                 if (n > blk_rq_cur_sectors(fd_req))
 433                         n = blk_rq_cur_sectors(fd_req);
 434         }
 435         fs->scount = n;
 436         swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
 437         out_8(&sw->sector, fs->req_sector);
 438         out_8(&sw->nsect, n);
 439         out_8(&sw->gap3, 0);
 440         out_le32(&dr->cmdptr, virt_to_bus(cp));
 441         if (rq_data_dir(fd_req) == WRITE) {
 442                 /* Set up 3 dma commands: write preamble, data, postamble */
 443                 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
 444                 ++cp;
 445                 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512);
 446                 ++cp;
 447                 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
 448         } else {
 449                 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512);
 450         }
 451         ++cp;
 452         out_le16(&cp->command, DBDMA_STOP);
 453         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 454         in_8(&sw->error);
 455         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 456         if (rq_data_dir(fd_req) == WRITE)
 457                 out_8(&sw->control_bis, WRITE_SECTORS);
 458         in_8(&sw->intr);
 459         out_le32(&dr->control, (RUN << 16) | RUN);
 460         /* enable intr when transfer complete */
 461         out_8(&sw->intr_enable, TRANSFER_DONE);
 462         out_8(&sw->control_bis, DO_ACTION);
 463         set_timeout(fs, 2*HZ, xfer_timeout);    /* enable timeout */
 464 }
 465
 466 static void act(struct floppy_state *fs)
 467 {
 468         for (;;) {
 469                 switch (fs->state) {
 470                 case idle:
 471                         return;         /* XXX shouldn't get here */
 472
 473                 case locating:
 474                         if (swim3_readbit(fs, TRACK_ZERO)) {
 475                                 fs->cur_cyl = 0;
 476                                 if (fs->req_cyl == 0)
 477                                         fs->state = do_transfer;
 478                                 else
 479                                         fs->state = seeking;
 480                                 break;
 481                         }
 482                         scan_track(fs);
 483                         return;
 484
 485                 case seeking:
 486                         if (fs->cur_cyl < 0) {
 487                                 fs->expect_cyl = -1;
 488                                 fs->state = locating;
 489                                 break;
 490                         }
 491                         if (fs->req_cyl == fs->cur_cyl) {
 492                                 printk("whoops, seeking 0\n");
 493                                 fs->state = do_transfer;
 494                                 break;
 495                         }
 496                         seek_track(fs, fs->req_cyl - fs->cur_cyl);
 497                         return;
 498
 499                 case settling:
 500                         /* check for SEEK_COMPLETE after 30ms */
 501                         fs->settle_time = (HZ + 32) / 33;
 502                         set_timeout(fs, fs->settle_time, settle_timeout);
 503                         return;
 504
 505                 case do_transfer:
 506                         if (fs->cur_cyl != fs->req_cyl) {
 507                                 if (fs->retries > 5) {
 508                                         __blk_end_request_cur(fd_req, -EIO);
 509                                         fs->state = idle;
 510                                         return;
 511                                 }
 512                                 fs->state = seeking;
 513                                 break;
 514                         }
 515                         setup_transfer(fs);
 516                         return;
 517
 518                 case jogging:
 519                         seek_track(fs, -5);
 520                         return;
 521
 522                 default:
 523                         printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
 524                         return;
 525                 }
 526         }
 527 }
 528
 529 static void scan_timeout(unsigned long data)
 530 {
 531         struct floppy_state *fs = (struct floppy_state *) data;
 532         struct swim3 __iomem *sw = fs->swim3;
 533
 534         fs->timeout_pending = 0;
 535         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 536         out_8(&sw->select, RELAX);
 537         out_8(&sw->intr_enable, 0);
 538         fs->cur_cyl = -1;
 539         if (fs->retries > 5) {
 540                 __blk_end_request_cur(fd_req, -EIO);
 541                 fs->state = idle;
 542                 start_request(fs);
 543         } else {
 544                 fs->state = jogging;
 545                 act(fs);
 546         }
 547 }
 548
 549 static void seek_timeout(unsigned long data)
 550 {
 551         struct floppy_state *fs = (struct floppy_state *) data;
 552         struct swim3 __iomem *sw = fs->swim3;
 553
 554         fs->timeout_pending = 0;
 555         out_8(&sw->control_bic, DO_SEEK);
 556         out_8(&sw->select, RELAX);
 557         out_8(&sw->intr_enable, 0);
 558         printk(KERN_ERR "swim3: seek timeout\n");
 559         __blk_end_request_cur(fd_req, -EIO);
 560         fs->state = idle;
 561         start_request(fs);
 562 }
 563
 564 static void settle_timeout(unsigned long data)
 565 {
 566         struct floppy_state *fs = (struct floppy_state *) data;
 567         struct swim3 __iomem *sw = fs->swim3;
 568
 569         fs->timeout_pending = 0;
 570         if (swim3_readbit(fs, SEEK_COMPLETE)) {
 571                 out_8(&sw->select, RELAX);
 572                 fs->state = locating;
 573                 act(fs);
 574                 return;
 575         }
 576         out_8(&sw->select, RELAX);
 577         if (fs->settle_time < 2*HZ) {
 578                 ++fs->settle_time;
 579                 set_timeout(fs, 1, settle_timeout);
 580                 return;
 581         }
 582         printk(KERN_ERR "swim3: seek settle timeout\n");
 583         __blk_end_request_cur(fd_req, -EIO);
 584         fs->state = idle;
 585         start_request(fs);
 586 }
 587
 588 static void xfer_timeout(unsigned long data)
 589 {
 590         struct floppy_state *fs = (struct floppy_state *) data;
 591         struct swim3 __iomem *sw = fs->swim3;
 592         struct dbdma_regs __iomem *dr = fs->dma;
 593         int n;
 594
 595         fs->timeout_pending = 0;
 596         out_le32(&dr->control, RUN << 16);
 597         /* We must wait a bit for dbdma to stop */
 598         for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
 599                 udelay(1);
 600         out_8(&sw->intr_enable, 0);
 601         out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 602         out_8(&sw->select, RELAX);
 603         printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
 604                (rq_data_dir(fd_req)==WRITE? "writ": "read"),
 605                (long)blk_rq_pos(fd_req));
 606         __blk_end_request_cur(fd_req, -EIO);
 607         fs->state = idle;
 608         start_request(fs);
 609 }
 610
 611 static irqreturn_t swim3_interrupt(int irq, void *dev_id)
 612 {
 613         struct floppy_state *fs = (struct floppy_state *) dev_id;
 614         struct swim3 __iomem *sw = fs->swim3;
 615         int intr, err, n;
 616         int stat, resid;
 617         struct dbdma_regs __iomem *dr;
 618         struct dbdma_cmd *cp;
 619
 620         intr = in_8(&sw->intr);
 621         err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
 622         if ((intr & ERROR_INTR) && fs->state != do_transfer)
 623                 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%x, intr=%x, err=%x\n",
 624                        fs->state, rq_data_dir(fd_req), intr, err);
 625         switch (fs->state) {
 626         case locating:
 627                 if (intr & SEEN_SECTOR) {
 628                         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 629                         out_8(&sw->select, RELAX);
 630                         out_8(&sw->intr_enable, 0);
 631                         del_timer(&fs->timeout);
 632                         fs->timeout_pending = 0;
 633                         if (sw->ctrack == 0xff) {
 634                                 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
 635                                 fs->cur_cyl = -1;
 636                                 if (fs->retries > 5) {
 637                                         __blk_end_request_cur(fd_req, -EIO);
 638                                         fs->state = idle;
 639                                         start_request(fs);
 640                                 } else {
 641                                         fs->state = jogging;
 642                                         act(fs);
 643                                 }
 644                                 break;
 645                         }
 646                         fs->cur_cyl = sw->ctrack;
 647                         fs->cur_sector = sw->csect;
 648                         if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
 649                                 printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
 650                                        fs->expect_cyl, fs->cur_cyl);
 651                         fs->state = do_transfer;
 652                         act(fs);
 653                 }
 654                 break;
 655         case seeking:
 656         case jogging:
 657                 if (sw->nseek == 0) {
 658                         out_8(&sw->control_bic, DO_SEEK);
 659                         out_8(&sw->select, RELAX);
 660                         out_8(&sw->intr_enable, 0);
 661                         del_timer(&fs->timeout);
 662                         fs->timeout_pending = 0;
 663                         if (fs->state == seeking)
 664                                 ++fs->retries;
 665                         fs->state = settling;
 666                         act(fs);
 667                 }
 668                 break;
 669         case settling:
 670                 out_8(&sw->intr_enable, 0);
 671                 del_timer(&fs->timeout);
 672                 fs->timeout_pending = 0;
 673                 act(fs);
 674                 break;
 675         case do_transfer:
 676                 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
 677                         break;
 678                 out_8(&sw->intr_enable, 0);
 679                 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 680                 out_8(&sw->select, RELAX);
 681                 del_timer(&fs->timeout);
 682                 fs->timeout_pending = 0;
 683                 dr = fs->dma;
 684                 cp = fs->dma_cmd;
 685                 if (rq_data_dir(fd_req) == WRITE)
 686                         ++cp;
 687                 /*
 688                  * Check that the main data transfer has finished.
 689                  * On writing, the swim3 sometimes doesn't use
 690                  * up all the bytes of the postamble, so we can still
 691                  * see DMA active here.  That doesn't matter as long
 692                  * as all the sector data has been transferred.
 693                  */
 694                 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
 695                         /* wait a little while for DMA to complete */
 696                         for (n = 0; n < 100; ++n) {
 697                                 if (cp->xfer_status != 0)
 698                                         break;
 699                                 udelay(1);
 700                                 barrier();
 701                         }
 702                 }
 703                 /* turn off DMA */
 704                 out_le32(&dr->control, (RUN | PAUSE) << 16);
 705                 stat = ld_le16(&cp->xfer_status);
 706                 resid = ld_le16(&cp->res_count);
 707                 if (intr & ERROR_INTR) {
 708                         n = fs->scount - 1 - resid / 512;
 709                         if (n > 0) {
 710                                 blk_update_request(fd_req, 0, n << 9);
 711                                 fs->req_sector += n;
 712                         }
 713                         if (fs->retries < 5) {
 714                                 ++fs->retries;
 715                                 act(fs);
 716                         } else {
 717                                 printk("swim3: error %sing block %ld (err=%x)\n",
 718                                        rq_data_dir(fd_req) == WRITE? "writ": "read",
 719                                        (long)blk_rq_pos(fd_req), err);
 720                                 __blk_end_request_cur(fd_req, -EIO);
 721                                 fs->state = idle;
 722                         }
 723                 } else {
 724                         if ((stat & ACTIVE) == 0 || resid != 0) {
 725                                 /* musta been an error */
 726                                 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
 727                                 printk(KERN_ERR "  state=%d, dir=%x, intr=%x, err=%x\n",
 728                                        fs->state, rq_data_dir(fd_req), intr, err);
 729                                 __blk_end_request_cur(fd_req, -EIO);
 730                                 fs->state = idle;
 731                                 start_request(fs);
 732                                 break;
 733                         }
 734                         if (__blk_end_request(fd_req, 0, fs->scount << 9)) {
 735                                 fs->req_sector += fs->scount;
 736                                 if (fs->req_sector > fs->secpertrack) {
 737                                         fs->req_sector -= fs->secpertrack;
 738                                         if (++fs->head > 1) {
 739                                                 fs->head = 0;
 740                                                 ++fs->req_cyl;
 741                                         }
 742                                 }
 743                                 act(fs);
 744                         } else
 745                                 fs->state = idle;
 746                 }
 747                 if (fs->state == idle)
 748                         start_request(fs);
 749                 break;
 750         default:
 751                 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);
 752         }
 753         return IRQ_HANDLED;
 754 }
 755
 756 /*
 757 static void fd_dma_interrupt(int irq, void *dev_id)
 758 {
 759 }
 760 */
 761
 762 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 763                       int interruptible)
 764 {
 765         unsigned long flags;
 766
 767         spin_lock_irqsave(&fs->lock, flags);
 768         if (fs->state != idle) {
 769                 ++fs->wanted;
 770                 while (fs->state != available) {
 771                         if (interruptible && signal_pending(current)) {
 772                                 --fs->wanted;
 773                                 spin_unlock_irqrestore(&fs->lock, flags);
 774                                 return -EINTR;
 775                         }
 776                         interruptible_sleep_on(&fs->wait);
 777                 }
 778                 --fs->wanted;
 779         }
 780         fs->state = state;
 781         spin_unlock_irqrestore(&fs->lock, flags);
 782         return 0;
 783 }
 784
 785 static void release_drive(struct floppy_state *fs)
 786 {
 787         unsigned long flags;
 788
 789         spin_lock_irqsave(&fs->lock, flags);
 790         fs->state = idle;
 791         start_request(fs);
 792         spin_unlock_irqrestore(&fs->lock, flags);
 793 }
 794
 795 static int fd_eject(struct floppy_state *fs)
 796 {
 797         int err, n;
 798
 799         err = grab_drive(fs, ejecting, 1);
 800         if (err)
 801                 return err;
 802         swim3_action(fs, EJECT);
 803         for (n = 20; n > 0; --n) {
 804                 if (signal_pending(current)) {
 805                         err = -EINTR;
 806                         break;
 807                 }
 808                 swim3_select(fs, RELAX);
 809                 schedule_timeout_interruptible(1);
 810                 if (swim3_readbit(fs, DISK_IN) == 0)
 811                         break;
 812         }
 813         swim3_select(fs, RELAX);
 814         udelay(150);
 815         fs->ejected = 1;
 816         release_drive(fs);
 817         return err;
 818 }
 819
 820 static struct floppy_struct floppy_type =
 821         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL };    /*  7 1.44MB 3.5"   */
 822
 823 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
 824                         unsigned int cmd, unsigned long param)
 825 {
 826         struct floppy_state *fs = bdev->bd_disk->private_data;
 827         int err;
 828
 829         if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
 830                 return -EPERM;
 831
 832 #ifdef CONFIG_PMAC_MEDIABAY
 833         if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
 834                 return -ENXIO;
 835 #endif
 836
 837         switch (cmd) {
 838         case FDEJECT:
 839                 if (fs->ref_count != 1)
 840                         return -EBUSY;
 841                 err = fd_eject(fs);
 842                 return err;
 843         case FDGETPRM:
 844                 if (copy_to_user((void __user *) param, &floppy_type,
 845                                  sizeof(struct floppy_struct)))
 846                         return -EFAULT;
 847                 return 0;
 848         }
 849         return -ENOTTY;
 850 }
 851
 852 static int floppy_open(struct block_device *bdev, fmode_t mode)
 853 {
 854         struct floppy_state *fs = bdev->bd_disk->private_data;
 855         struct swim3 __iomem *sw = fs->swim3;
 856         int n, err = 0;
 857
 858         if (fs->ref_count == 0) {
 859 #ifdef CONFIG_PMAC_MEDIABAY
 860                 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
 861                         return -ENXIO;
 862 #endif
 863                 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
 864                 out_8(&sw->control_bic, 0xff);
 865                 out_8(&sw->mode, 0x95);
 866                 udelay(10);
 867                 out_8(&sw->intr_enable, 0);
 868                 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
 869                 swim3_action(fs, MOTOR_ON);
 870                 fs->write_prot = -1;
 871                 fs->cur_cyl = -1;
 872                 for (n = 0; n < 2 * HZ; ++n) {
 873                         if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
 874                                 break;
 875                         if (signal_pending(current)) {
 876                                 err = -EINTR;
 877                                 break;
 878                         }
 879                         swim3_select(fs, RELAX);
 880                         schedule_timeout_interruptible(1);
 881                 }
 882                 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
 883                                  || swim3_readbit(fs, DISK_IN) == 0))
 884                         err = -ENXIO;
 885                 swim3_action(fs, SETMFM);
 886                 swim3_select(fs, RELAX);
 887
 888         } else if (fs->ref_count == -1 || mode & FMODE_EXCL)
 889                 return -EBUSY;
 890
 891         if (err == 0 && (mode & FMODE_NDELAY) == 0
 892             && (mode & (FMODE_READ|FMODE_WRITE))) {
 893                 check_disk_change(bdev);
 894                 if (fs->ejected)
 895                         err = -ENXIO;
 896         }
 897
 898         if (err == 0 && (mode & FMODE_WRITE)) {
 899                 if (fs->write_prot < 0)
 900                         fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 901                 if (fs->write_prot)
 902                         err = -EROFS;
 903         }
 904
 905         if (err) {
 906                 if (fs->ref_count == 0) {
 907                         swim3_action(fs, MOTOR_OFF);
 908                         out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
 909                         swim3_select(fs, RELAX);
 910                 }
 911                 return err;
 912         }
 913
 914         if (mode & FMODE_EXCL)
 915                 fs->ref_count = -1;
 916         else
 917                 ++fs->ref_count;
 918
 919         return 0;
 920 }
 921
 922 static int floppy_release(struct gendisk *disk, fmode_t mode)
 923 {
 924         struct floppy_state *fs = disk->private_data;
 925         struct swim3 __iomem *sw = fs->swim3;
 926         if (fs->ref_count > 0 && --fs->ref_count == 0) {
 927                 swim3_action(fs, MOTOR_OFF);
 928                 out_8(&sw->control_bic, 0xff);
 929                 swim3_select(fs, RELAX);
 930         }
 931         return 0;
 932 }
 933
 934 static int floppy_check_change(struct gendisk *disk)
 935 {
 936         struct floppy_state *fs = disk->private_data;
 937         return fs->ejected;
 938 }
 939
 940 static int floppy_revalidate(struct gendisk *disk)
 941 {
 942         struct floppy_state *fs = disk->private_data;
 943         struct swim3 __iomem *sw;
 944         int ret, n;
 945
 946 #ifdef CONFIG_PMAC_MEDIABAY
 947         if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
 948                 return -ENXIO;
 949 #endif
 950
 951         sw = fs->swim3;
 952         grab_drive(fs, revalidating, 0);
 953         out_8(&sw->intr_enable, 0);
 954         out_8(&sw->control_bis, DRIVE_ENABLE);
 955         swim3_action(fs, MOTOR_ON);     /* necessary? */
 956         fs->write_prot = -1;
 957         fs->cur_cyl = -1;
 958         mdelay(1);
 959         for (n = HZ; n > 0; --n) {
 960                 if (swim3_readbit(fs, SEEK_COMPLETE))
 961                         break;
 962                 if (signal_pending(current))
 963                         break;
 964                 swim3_select(fs, RELAX);
 965                 schedule_timeout_interruptible(1);
 966         }
 967         ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
 968                 || swim3_readbit(fs, DISK_IN) == 0;
 969         if (ret)
 970                 swim3_action(fs, MOTOR_OFF);
 971         else {
 972                 fs->ejected = 0;
 973                 swim3_action(fs, SETMFM);
 974         }
 975         swim3_select(fs, RELAX);
 976
 977         release_drive(fs);
 978         return ret;
 979 }
 980
 981 static struct block_device_operations floppy_fops = {
 982         .open           = floppy_open,
 983         .release        = floppy_release,
 984         .locked_ioctl   = floppy_ioctl,
 985         .media_changed  = floppy_check_change,
 986         .revalidate_disk= floppy_revalidate,
 987 };
 988
 989 static int swim3_add_device(struct macio_dev *mdev, int index)
 990 {
 991         struct device_node *swim = mdev->ofdev.node;
 992         struct device_node *mediabay;
 993         struct floppy_state *fs = &floppy_states[index];
 994         int rc = -EBUSY;
 995
 996         /* Check & Request resources */
 997         if (macio_resource_count(mdev) < 2) {
 998                 printk(KERN_WARNING "ifd%d: no address for %s\n",
 999                        index, swim->full_name);
1000                 return -ENXIO;
1001         }
1002         if (macio_irq_count(mdev) < 2) {
1003                 printk(KERN_WARNING "fd%d: no intrs for device %s\n",
1004                         index, swim->full_name);
1005         }
1006         if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
1007                 printk(KERN_ERR "fd%d: can't request mmio resource for %s\n",
1008                        index, swim->full_name);
1009                 return -EBUSY;
1010         }
1011         if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
1012                 printk(KERN_ERR "fd%d: can't request dma resource for %s\n",
1013                        index, swim->full_name);
1014                 macio_release_resource(mdev, 0);
1015                 return -EBUSY;
1016         }
1017         dev_set_drvdata(&mdev->ofdev.dev, fs);
1018
1019         mediabay = (strcasecmp(swim->parent->type, "media-bay") == 0) ?
1020                 swim->parent : NULL;
1021         if (mediabay == NULL)
1022                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1023
1024         memset(fs, 0, sizeof(*fs));
1025         spin_lock_init(&fs->lock);
1026         fs->state = idle;
1027         fs->swim3 = (struct swim3 __iomem *)
1028                 ioremap(macio_resource_start(mdev, 0), 0x200);
1029         if (fs->swim3 == NULL) {
1030                 printk("fd%d: couldn't map registers for %s\n",
1031                        index, swim->full_name);
1032                 rc = -ENOMEM;
1033                 goto out_release;
1034         }
1035         fs->dma = (struct dbdma_regs __iomem *)
1036                 ioremap(macio_resource_start(mdev, 1), 0x200);
1037         if (fs->dma == NULL) {
1038                 printk("fd%d: couldn't map DMA for %s\n",
1039                        index, swim->full_name);
1040                 iounmap(fs->swim3);
1041                 rc = -ENOMEM;
1042                 goto out_release;
1043         }
1044         fs->swim3_intr = macio_irq(mdev, 0);
1045         fs->dma_intr = macio_irq(mdev, 1);;
1046         fs->cur_cyl = -1;
1047         fs->cur_sector = -1;
1048         fs->secpercyl = 36;
1049         fs->secpertrack = 18;
1050         fs->total_secs = 2880;
1051         fs->media_bay = mediabay;
1052         init_waitqueue_head(&fs->wait);
1053
1054         fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1055         memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1056         st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1057
1058         if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1059                 printk(KERN_ERR "fd%d: couldn't request irq %d for %s\n",
1060                        index, fs->swim3_intr, swim->full_name);
1061                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1062                 goto out_unmap;
1063                 return -EBUSY;
1064         }
1065 /*
1066         if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
1067                 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
1068                        fs->dma_intr);
1069                 return -EBUSY;
1070         }
1071 */
1072
1073         init_timer(&fs->timeout);
1074
1075         printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
1076                 mediabay ? "in media bay" : "");
1077
1078         return 0;
1079
1080  out_unmap:
1081         iounmap(fs->dma);
1082         iounmap(fs->swim3);
1083
1084  out_release:
1085         macio_release_resource(mdev, 0);
1086         macio_release_resource(mdev, 1);
1087
1088         return rc;
1089 }
1090
1091 static int __devinit swim3_attach(struct macio_dev *mdev, const struct of_device_id *match)
1092 {
1093         int i, rc;
1094         struct gendisk *disk;
1095
1096         /* Add the drive */
1097         rc = swim3_add_device(mdev, floppy_count);
1098         if (rc)
1099                 return rc;
1100
1101         /* Now create the queue if not there yet */
1102         if (swim3_queue == NULL) {
1103                 /* If we failed, there isn't much we can do as the driver is still
1104                  * too dumb to remove the device, just bail out
1105                  */
1106                 if (register_blkdev(FLOPPY_MAJOR, "fd"))
1107                         return 0;
1108                 swim3_queue = blk_init_queue(do_fd_request, &swim3_lock);
1109                 if (swim3_queue == NULL) {
1110                         unregister_blkdev(FLOPPY_MAJOR, "fd");
1111                         return 0;
1112                 }
1113         }
1114
1115         /* Now register that disk. Same comment about failure handling */
1116         i = floppy_count++;
1117         disk = disks[i] = alloc_disk(1);
1118         if (disk == NULL)
1119                 return 0;
1120
1121         disk->major = FLOPPY_MAJOR;
1122         disk->first_minor = i;
1123         disk->fops = &floppy_fops;
1124         disk->private_data = &floppy_states[i];
1125         disk->queue = swim3_queue;
1126         disk->flags |= GENHD_FL_REMOVABLE;
1127         sprintf(disk->disk_name, "fd%d", i);
1128         set_capacity(disk, 2880);
1129         add_disk(disk);
1130
1131         return 0;
1132 }
1133
1134 static struct of_device_id swim3_match[] =
1135 {
1136         {
1137         .name           = "swim3",
1138         },
1139         {
1140         .compatible     = "ohare-swim3"
1141         },
1142         {
1143         .compatible     = "swim3"
1144         },
1145 };
1146
1147 static struct macio_driver swim3_driver =
1148 {
1149         .name           = "swim3",
1150         .match_table    = swim3_match,
1151         .probe          = swim3_attach,
1152 #if 0
1153         .suspend        = swim3_suspend,
1154         .resume         = swim3_resume,
1155 #endif
1156 };
1157
1158
1159 int swim3_init(void)
1160 {
1161         macio_register_driver(&swim3_driver);
1162         return 0;
1163 }
1164
1165 module_init(swim3_init)
1166
1167 MODULE_LICENSE("GPL");
1168 MODULE_AUTHOR("Paul Mackerras");
1169 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);