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 macio_dev *mdev;
 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 bool swim3_end_request(int err, unsigned int nr_bytes)
 255 {
 256         if (__blk_end_request(fd_req, err, nr_bytes))
 257                 return true;
 258
 259         fd_req = NULL;
 260         return false;
 261 }
 262
 263 static bool swim3_end_request_cur(int err)
 264 {
 265         return swim3_end_request(err, blk_rq_cur_bytes(fd_req));
 266 }
 267
 268 static void swim3_select(struct floppy_state *fs, int sel)
 269 {
 270         struct swim3 __iomem *sw = fs->swim3;
 271
 272         out_8(&sw->select, RELAX);
 273         if (sel & 8)
 274                 out_8(&sw->control_bis, SELECT);
 275         else
 276                 out_8(&sw->control_bic, SELECT);
 277         out_8(&sw->select, sel & CA_MASK);
 278 }
 279
 280 static void swim3_action(struct floppy_state *fs, int action)
 281 {
 282         struct swim3 __iomem *sw = fs->swim3;
 283
 284         swim3_select(fs, action);
 285         udelay(1);
 286         out_8(&sw->select, sw->select | LSTRB);
 287         udelay(2);
 288         out_8(&sw->select, sw->select & ~LSTRB);
 289         udelay(1);
 290 }
 291
 292 static int swim3_readbit(struct floppy_state *fs, int bit)
 293 {
 294         struct swim3 __iomem *sw = fs->swim3;
 295         int stat;
 296
 297         swim3_select(fs, bit);
 298         udelay(1);
 299         stat = in_8(&sw->status);
 300         return (stat & DATA) == 0;
 301 }
 302
 303 static void do_fd_request(struct request_queue * q)
 304 {
 305         int i;
 306
 307         for(i=0; i<floppy_count; i++) {
 308                 struct floppy_state *fs = &floppy_states[i];
 309                 if (fs->mdev->media_bay &&
 310                     check_media_bay(fs->mdev->media_bay) != MB_FD)
 311                         continue;
 312                 start_request(fs);
 313         }
 314 }
 315
 316 static void start_request(struct floppy_state *fs)
 317 {
 318         struct request *req;
 319         unsigned long x;
 320
 321         if (fs->state == idle && fs->wanted) {
 322                 fs->state = available;
 323                 wake_up(&fs->wait);
 324                 return;
 325         }
 326         while (fs->state == idle) {
 327                 if (!fd_req) {
 328                         fd_req = blk_fetch_request(swim3_queue);
 329                         if (!fd_req)
 330                                 break;
 331                 }
 332                 req = fd_req;
 333 #if 0
 334                 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n",
 335                        req->rq_disk->disk_name, req->cmd,
 336                        (long)blk_rq_pos(req), blk_rq_sectors(req), req->buffer);
 337                 printk("           errors=%d current_nr_sectors=%u\n",
 338                        req->errors, blk_rq_cur_sectors(req));
 339 #endif
 340
 341                 if (blk_rq_pos(req) >= fs->total_secs) {
 342                         swim3_end_request_cur(-EIO);
 343                         continue;
 344                 }
 345                 if (fs->ejected) {
 346                         swim3_end_request_cur(-EIO);
 347                         continue;
 348                 }
 349
 350                 if (rq_data_dir(req) == WRITE) {
 351                         if (fs->write_prot < 0)
 352                                 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 353                         if (fs->write_prot) {
 354                                 swim3_end_request_cur(-EIO);
 355                                 continue;
 356                         }
 357                 }
 358
 359                 /* Do not remove the cast. blk_rq_pos(req) is now a
 360                  * sector_t and can be 64 bits, but it will never go
 361                  * past 32 bits for this driver anyway, so we can
 362                  * safely cast it down and not have to do a 64/32
 363                  * division
 364                  */
 365                 fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl;
 366                 x = ((long)blk_rq_pos(req)) % fs->secpercyl;
 367                 fs->head = x / fs->secpertrack;
 368                 fs->req_sector = x % fs->secpertrack + 1;
 369                 fd_req = req;
 370                 fs->state = do_transfer;
 371                 fs->retries = 0;
 372
 373                 act(fs);
 374         }
 375 }
 376
 377 static void set_timeout(struct floppy_state *fs, int nticks,
 378                         void (*proc)(unsigned long))
 379 {
 380         unsigned long flags;
 381
 382         spin_lock_irqsave(&fs->lock, flags);
 383         if (fs->timeout_pending)
 384                 del_timer(&fs->timeout);
 385         fs->timeout.expires = jiffies + nticks;
 386         fs->timeout.function = proc;
 387         fs->timeout.data = (unsigned long) fs;
 388         add_timer(&fs->timeout);
 389         fs->timeout_pending = 1;
 390         spin_unlock_irqrestore(&fs->lock, flags);
 391 }
 392
 393 static inline void scan_track(struct floppy_state *fs)
 394 {
 395         struct swim3 __iomem *sw = fs->swim3;
 396
 397         swim3_select(fs, READ_DATA_0);
 398         in_8(&sw->intr);                /* clear SEEN_SECTOR bit */
 399         in_8(&sw->error);
 400         out_8(&sw->intr_enable, SEEN_SECTOR);
 401         out_8(&sw->control_bis, DO_ACTION);
 402         /* enable intr when track found */
 403         set_timeout(fs, HZ, scan_timeout);      /* enable timeout */
 404 }
 405
 406 static inline void seek_track(struct floppy_state *fs, int n)
 407 {
 408         struct swim3 __iomem *sw = fs->swim3;
 409
 410         if (n >= 0) {
 411                 swim3_action(fs, SEEK_POSITIVE);
 412                 sw->nseek = n;
 413         } else {
 414                 swim3_action(fs, SEEK_NEGATIVE);
 415                 sw->nseek = -n;
 416         }
 417         fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
 418         swim3_select(fs, STEP);
 419         in_8(&sw->error);
 420         /* enable intr when seek finished */
 421         out_8(&sw->intr_enable, SEEK_DONE);
 422         out_8(&sw->control_bis, DO_SEEK);
 423         set_timeout(fs, 3*HZ, seek_timeout);    /* enable timeout */
 424         fs->settle_time = 0;
 425 }
 426
 427 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
 428                             void *buf, int count)
 429 {
 430         st_le16(&cp->req_count, count);
 431         st_le16(&cp->command, cmd);
 432         st_le32(&cp->phy_addr, virt_to_bus(buf));
 433         cp->xfer_status = 0;
 434 }
 435
 436 static inline void setup_transfer(struct floppy_state *fs)
 437 {
 438         int n;
 439         struct swim3 __iomem *sw = fs->swim3;
 440         struct dbdma_cmd *cp = fs->dma_cmd;
 441         struct dbdma_regs __iomem *dr = fs->dma;
 442
 443         if (blk_rq_cur_sectors(fd_req) <= 0) {
 444                 printk(KERN_ERR "swim3: transfer 0 sectors?\n");
 445                 return;
 446         }
 447         if (rq_data_dir(fd_req) == WRITE)
 448                 n = 1;
 449         else {
 450                 n = fs->secpertrack - fs->req_sector + 1;
 451                 if (n > blk_rq_cur_sectors(fd_req))
 452                         n = blk_rq_cur_sectors(fd_req);
 453         }
 454         fs->scount = n;
 455         swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
 456         out_8(&sw->sector, fs->req_sector);
 457         out_8(&sw->nsect, n);
 458         out_8(&sw->gap3, 0);
 459         out_le32(&dr->cmdptr, virt_to_bus(cp));
 460         if (rq_data_dir(fd_req) == WRITE) {
 461                 /* Set up 3 dma commands: write preamble, data, postamble */
 462                 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
 463                 ++cp;
 464                 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512);
 465                 ++cp;
 466                 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
 467         } else {
 468                 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512);
 469         }
 470         ++cp;
 471         out_le16(&cp->command, DBDMA_STOP);
 472         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 473         in_8(&sw->error);
 474         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 475         if (rq_data_dir(fd_req) == WRITE)
 476                 out_8(&sw->control_bis, WRITE_SECTORS);
 477         in_8(&sw->intr);
 478         out_le32(&dr->control, (RUN << 16) | RUN);
 479         /* enable intr when transfer complete */
 480         out_8(&sw->intr_enable, TRANSFER_DONE);
 481         out_8(&sw->control_bis, DO_ACTION);
 482         set_timeout(fs, 2*HZ, xfer_timeout);    /* enable timeout */
 483 }
 484
 485 static void act(struct floppy_state *fs)
 486 {
 487         for (;;) {
 488                 switch (fs->state) {
 489                 case idle:
 490                         return;         /* XXX shouldn't get here */
 491
 492                 case locating:
 493                         if (swim3_readbit(fs, TRACK_ZERO)) {
 494                                 fs->cur_cyl = 0;
 495                                 if (fs->req_cyl == 0)
 496                                         fs->state = do_transfer;
 497                                 else
 498                                         fs->state = seeking;
 499                                 break;
 500                         }
 501                         scan_track(fs);
 502                         return;
 503
 504                 case seeking:
 505                         if (fs->cur_cyl < 0) {
 506                                 fs->expect_cyl = -1;
 507                                 fs->state = locating;
 508                                 break;
 509                         }
 510                         if (fs->req_cyl == fs->cur_cyl) {
 511                                 printk("whoops, seeking 0\n");
 512                                 fs->state = do_transfer;
 513                                 break;
 514                         }
 515                         seek_track(fs, fs->req_cyl - fs->cur_cyl);
 516                         return;
 517
 518                 case settling:
 519                         /* check for SEEK_COMPLETE after 30ms */
 520                         fs->settle_time = (HZ + 32) / 33;
 521                         set_timeout(fs, fs->settle_time, settle_timeout);
 522                         return;
 523
 524                 case do_transfer:
 525                         if (fs->cur_cyl != fs->req_cyl) {
 526                                 if (fs->retries > 5) {
 527                                         swim3_end_request_cur(-EIO);
 528                                         fs->state = idle;
 529                                         return;
 530                                 }
 531                                 fs->state = seeking;
 532                                 break;
 533                         }
 534                         setup_transfer(fs);
 535                         return;
 536
 537                 case jogging:
 538                         seek_track(fs, -5);
 539                         return;
 540
 541                 default:
 542                         printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
 543                         return;
 544                 }
 545         }
 546 }
 547
 548 static void scan_timeout(unsigned long data)
 549 {
 550         struct floppy_state *fs = (struct floppy_state *) data;
 551         struct swim3 __iomem *sw = fs->swim3;
 552
 553         fs->timeout_pending = 0;
 554         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 555         out_8(&sw->select, RELAX);
 556         out_8(&sw->intr_enable, 0);
 557         fs->cur_cyl = -1;
 558         if (fs->retries > 5) {
 559                 swim3_end_request_cur(-EIO);
 560                 fs->state = idle;
 561                 start_request(fs);
 562         } else {
 563                 fs->state = jogging;
 564                 act(fs);
 565         }
 566 }
 567
 568 static void seek_timeout(unsigned long data)
 569 {
 570         struct floppy_state *fs = (struct floppy_state *) data;
 571         struct swim3 __iomem *sw = fs->swim3;
 572
 573         fs->timeout_pending = 0;
 574         out_8(&sw->control_bic, DO_SEEK);
 575         out_8(&sw->select, RELAX);
 576         out_8(&sw->intr_enable, 0);
 577         printk(KERN_ERR "swim3: seek timeout\n");
 578         swim3_end_request_cur(-EIO);
 579         fs->state = idle;
 580         start_request(fs);
 581 }
 582
 583 static void settle_timeout(unsigned long data)
 584 {
 585         struct floppy_state *fs = (struct floppy_state *) data;
 586         struct swim3 __iomem *sw = fs->swim3;
 587
 588         fs->timeout_pending = 0;
 589         if (swim3_readbit(fs, SEEK_COMPLETE)) {
 590                 out_8(&sw->select, RELAX);
 591                 fs->state = locating;
 592                 act(fs);
 593                 return;
 594         }
 595         out_8(&sw->select, RELAX);
 596         if (fs->settle_time < 2*HZ) {
 597                 ++fs->settle_time;
 598                 set_timeout(fs, 1, settle_timeout);
 599                 return;
 600         }
 601         printk(KERN_ERR "swim3: seek settle timeout\n");
 602         swim3_end_request_cur(-EIO);
 603         fs->state = idle;
 604         start_request(fs);
 605 }
 606
 607 static void xfer_timeout(unsigned long data)
 608 {
 609         struct floppy_state *fs = (struct floppy_state *) data;
 610         struct swim3 __iomem *sw = fs->swim3;
 611         struct dbdma_regs __iomem *dr = fs->dma;
 612         int n;
 613
 614         fs->timeout_pending = 0;
 615         out_le32(&dr->control, RUN << 16);
 616         /* We must wait a bit for dbdma to stop */
 617         for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
 618                 udelay(1);
 619         out_8(&sw->intr_enable, 0);
 620         out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 621         out_8(&sw->select, RELAX);
 622         printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
 623                (rq_data_dir(fd_req)==WRITE? "writ": "read"),
 624                (long)blk_rq_pos(fd_req));
 625         swim3_end_request_cur(-EIO);
 626         fs->state = idle;
 627         start_request(fs);
 628 }
 629
 630 static irqreturn_t swim3_interrupt(int irq, void *dev_id)
 631 {
 632         struct floppy_state *fs = (struct floppy_state *) dev_id;
 633         struct swim3 __iomem *sw = fs->swim3;
 634         int intr, err, n;
 635         int stat, resid;
 636         struct dbdma_regs __iomem *dr;
 637         struct dbdma_cmd *cp;
 638
 639         intr = in_8(&sw->intr);
 640         err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
 641         if ((intr & ERROR_INTR) && fs->state != do_transfer)
 642                 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%x, intr=%x, err=%x\n",
 643                        fs->state, rq_data_dir(fd_req), intr, err);
 644         switch (fs->state) {
 645         case locating:
 646                 if (intr & SEEN_SECTOR) {
 647                         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 648                         out_8(&sw->select, RELAX);
 649                         out_8(&sw->intr_enable, 0);
 650                         del_timer(&fs->timeout);
 651                         fs->timeout_pending = 0;
 652                         if (sw->ctrack == 0xff) {
 653                                 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
 654                                 fs->cur_cyl = -1;
 655                                 if (fs->retries > 5) {
 656                                         swim3_end_request_cur(-EIO);
 657                                         fs->state = idle;
 658                                         start_request(fs);
 659                                 } else {
 660                                         fs->state = jogging;
 661                                         act(fs);
 662                                 }
 663                                 break;
 664                         }
 665                         fs->cur_cyl = sw->ctrack;
 666                         fs->cur_sector = sw->csect;
 667                         if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
 668                                 printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
 669                                        fs->expect_cyl, fs->cur_cyl);
 670                         fs->state = do_transfer;
 671                         act(fs);
 672                 }
 673                 break;
 674         case seeking:
 675         case jogging:
 676                 if (sw->nseek == 0) {
 677                         out_8(&sw->control_bic, DO_SEEK);
 678                         out_8(&sw->select, RELAX);
 679                         out_8(&sw->intr_enable, 0);
 680                         del_timer(&fs->timeout);
 681                         fs->timeout_pending = 0;
 682                         if (fs->state == seeking)
 683                                 ++fs->retries;
 684                         fs->state = settling;
 685                         act(fs);
 686                 }
 687                 break;
 688         case settling:
 689                 out_8(&sw->intr_enable, 0);
 690                 del_timer(&fs->timeout);
 691                 fs->timeout_pending = 0;
 692                 act(fs);
 693                 break;
 694         case do_transfer:
 695                 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
 696                         break;
 697                 out_8(&sw->intr_enable, 0);
 698                 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 699                 out_8(&sw->select, RELAX);
 700                 del_timer(&fs->timeout);
 701                 fs->timeout_pending = 0;
 702                 dr = fs->dma;
 703                 cp = fs->dma_cmd;
 704                 if (rq_data_dir(fd_req) == WRITE)
 705                         ++cp;
 706                 /*
 707                  * Check that the main data transfer has finished.
 708                  * On writing, the swim3 sometimes doesn't use
 709                  * up all the bytes of the postamble, so we can still
 710                  * see DMA active here.  That doesn't matter as long
 711                  * as all the sector data has been transferred.
 712                  */
 713                 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
 714                         /* wait a little while for DMA to complete */
 715                         for (n = 0; n < 100; ++n) {
 716                                 if (cp->xfer_status != 0)
 717                                         break;
 718                                 udelay(1);
 719                                 barrier();
 720                         }
 721                 }
 722                 /* turn off DMA */
 723                 out_le32(&dr->control, (RUN | PAUSE) << 16);
 724                 stat = ld_le16(&cp->xfer_status);
 725                 resid = ld_le16(&cp->res_count);
 726                 if (intr & ERROR_INTR) {
 727                         n = fs->scount - 1 - resid / 512;
 728                         if (n > 0) {
 729                                 blk_update_request(fd_req, 0, n << 9);
 730                                 fs->req_sector += n;
 731                         }
 732                         if (fs->retries < 5) {
 733                                 ++fs->retries;
 734                                 act(fs);
 735                         } else {
 736                                 printk("swim3: error %sing block %ld (err=%x)\n",
 737                                        rq_data_dir(fd_req) == WRITE? "writ": "read",
 738                                        (long)blk_rq_pos(fd_req), err);
 739                                 swim3_end_request_cur(-EIO);
 740                                 fs->state = idle;
 741                         }
 742                 } else {
 743                         if ((stat & ACTIVE) == 0 || resid != 0) {
 744                                 /* musta been an error */
 745                                 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
 746                                 printk(KERN_ERR "  state=%d, dir=%x, intr=%x, err=%x\n",
 747                                        fs->state, rq_data_dir(fd_req), intr, err);
 748                                 swim3_end_request_cur(-EIO);
 749                                 fs->state = idle;
 750                                 start_request(fs);
 751                                 break;
 752                         }
 753                         if (swim3_end_request(0, fs->scount << 9)) {
 754                                 fs->req_sector += fs->scount;
 755                                 if (fs->req_sector > fs->secpertrack) {
 756                                         fs->req_sector -= fs->secpertrack;
 757                                         if (++fs->head > 1) {
 758                                                 fs->head = 0;
 759                                                 ++fs->req_cyl;
 760                                         }
 761                                 }
 762                                 act(fs);
 763                         } else
 764                                 fs->state = idle;
 765                 }
 766                 if (fs->state == idle)
 767                         start_request(fs);
 768                 break;
 769         default:
 770                 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);
 771         }
 772         return IRQ_HANDLED;
 773 }
 774
 775 /*
 776 static void fd_dma_interrupt(int irq, void *dev_id)
 777 {
 778 }
 779 */
 780
 781 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 782                       int interruptible)
 783 {
 784         unsigned long flags;
 785
 786         spin_lock_irqsave(&fs->lock, flags);
 787         if (fs->state != idle) {
 788                 ++fs->wanted;
 789                 while (fs->state != available) {
 790                         if (interruptible && signal_pending(current)) {
 791                                 --fs->wanted;
 792                                 spin_unlock_irqrestore(&fs->lock, flags);
 793                                 return -EINTR;
 794                         }
 795                         interruptible_sleep_on(&fs->wait);
 796                 }
 797                 --fs->wanted;
 798         }
 799         fs->state = state;
 800         spin_unlock_irqrestore(&fs->lock, flags);
 801         return 0;
 802 }
 803
 804 static void release_drive(struct floppy_state *fs)
 805 {
 806         unsigned long flags;
 807
 808         spin_lock_irqsave(&fs->lock, flags);
 809         fs->state = idle;
 810         start_request(fs);
 811         spin_unlock_irqrestore(&fs->lock, flags);
 812 }
 813
 814 static int fd_eject(struct floppy_state *fs)
 815 {
 816         int err, n;
 817
 818         err = grab_drive(fs, ejecting, 1);
 819         if (err)
 820                 return err;
 821         swim3_action(fs, EJECT);
 822         for (n = 20; n > 0; --n) {
 823                 if (signal_pending(current)) {
 824                         err = -EINTR;
 825                         break;
 826                 }
 827                 swim3_select(fs, RELAX);
 828                 schedule_timeout_interruptible(1);
 829                 if (swim3_readbit(fs, DISK_IN) == 0)
 830                         break;
 831         }
 832         swim3_select(fs, RELAX);
 833         udelay(150);
 834         fs->ejected = 1;
 835         release_drive(fs);
 836         return err;
 837 }
 838
 839 static struct floppy_struct floppy_type =
 840         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL };    /*  7 1.44MB 3.5"   */
 841
 842 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
 843                         unsigned int cmd, unsigned long param)
 844 {
 845         struct floppy_state *fs = bdev->bd_disk->private_data;
 846         int err;
 847
 848         if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
 849                 return -EPERM;
 850
 851         if (fs->mdev->media_bay &&
 852             check_media_bay(fs->mdev->media_bay) != MB_FD)
 853                 return -ENXIO;
 854
 855         switch (cmd) {
 856         case FDEJECT:
 857                 if (fs->ref_count != 1)
 858                         return -EBUSY;
 859                 err = fd_eject(fs);
 860                 return err;
 861         case FDGETPRM:
 862                 if (copy_to_user((void __user *) param, &floppy_type,
 863                                  sizeof(struct floppy_struct)))
 864                         return -EFAULT;
 865                 return 0;
 866         }
 867         return -ENOTTY;
 868 }
 869
 870 static int floppy_open(struct block_device *bdev, fmode_t mode)
 871 {
 872         struct floppy_state *fs = bdev->bd_disk->private_data;
 873         struct swim3 __iomem *sw = fs->swim3;
 874         int n, err = 0;
 875
 876         if (fs->ref_count == 0) {
 877                 if (fs->mdev->media_bay &&
 878                     check_media_bay(fs->mdev->media_bay) != MB_FD)
 879                         return -ENXIO;
 880                 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
 881                 out_8(&sw->control_bic, 0xff);
 882                 out_8(&sw->mode, 0x95);
 883                 udelay(10);
 884                 out_8(&sw->intr_enable, 0);
 885                 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
 886                 swim3_action(fs, MOTOR_ON);
 887                 fs->write_prot = -1;
 888                 fs->cur_cyl = -1;
 889                 for (n = 0; n < 2 * HZ; ++n) {
 890                         if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
 891                                 break;
 892                         if (signal_pending(current)) {
 893                                 err = -EINTR;
 894                                 break;
 895                         }
 896                         swim3_select(fs, RELAX);
 897                         schedule_timeout_interruptible(1);
 898                 }
 899                 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
 900                                  || swim3_readbit(fs, DISK_IN) == 0))
 901                         err = -ENXIO;
 902                 swim3_action(fs, SETMFM);
 903                 swim3_select(fs, RELAX);
 904
 905         } else if (fs->ref_count == -1 || mode & FMODE_EXCL)
 906                 return -EBUSY;
 907
 908         if (err == 0 && (mode & FMODE_NDELAY) == 0
 909             && (mode & (FMODE_READ|FMODE_WRITE))) {
 910                 check_disk_change(bdev);
 911                 if (fs->ejected)
 912                         err = -ENXIO;
 913         }
 914
 915         if (err == 0 && (mode & FMODE_WRITE)) {
 916                 if (fs->write_prot < 0)
 917                         fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 918                 if (fs->write_prot)
 919                         err = -EROFS;
 920         }
 921
 922         if (err) {
 923                 if (fs->ref_count == 0) {
 924                         swim3_action(fs, MOTOR_OFF);
 925                         out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
 926                         swim3_select(fs, RELAX);
 927                 }
 928                 return err;
 929         }
 930
 931         if (mode & FMODE_EXCL)
 932                 fs->ref_count = -1;
 933         else
 934                 ++fs->ref_count;
 935
 936         return 0;
 937 }
 938
 939 static int floppy_release(struct gendisk *disk, fmode_t mode)
 940 {
 941         struct floppy_state *fs = disk->private_data;
 942         struct swim3 __iomem *sw = fs->swim3;
 943         if (fs->ref_count > 0 && --fs->ref_count == 0) {
 944                 swim3_action(fs, MOTOR_OFF);
 945                 out_8(&sw->control_bic, 0xff);
 946                 swim3_select(fs, RELAX);
 947         }
 948         return 0;
 949 }
 950
 951 static int floppy_check_change(struct gendisk *disk)
 952 {
 953         struct floppy_state *fs = disk->private_data;
 954         return fs->ejected;
 955 }
 956
 957 static int floppy_revalidate(struct gendisk *disk)
 958 {
 959         struct floppy_state *fs = disk->private_data;
 960         struct swim3 __iomem *sw;
 961         int ret, n;
 962
 963         if (fs->mdev->media_bay &&
 964             check_media_bay(fs->mdev->media_bay) != MB_FD)
 965                 return -ENXIO;
 966
 967         sw = fs->swim3;
 968         grab_drive(fs, revalidating, 0);
 969         out_8(&sw->intr_enable, 0);
 970         out_8(&sw->control_bis, DRIVE_ENABLE);
 971         swim3_action(fs, MOTOR_ON);     /* necessary? */
 972         fs->write_prot = -1;
 973         fs->cur_cyl = -1;
 974         mdelay(1);
 975         for (n = HZ; n > 0; --n) {
 976                 if (swim3_readbit(fs, SEEK_COMPLETE))
 977                         break;
 978                 if (signal_pending(current))
 979                         break;
 980                 swim3_select(fs, RELAX);
 981                 schedule_timeout_interruptible(1);
 982         }
 983         ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
 984                 || swim3_readbit(fs, DISK_IN) == 0;
 985         if (ret)
 986                 swim3_action(fs, MOTOR_OFF);
 987         else {
 988                 fs->ejected = 0;
 989                 swim3_action(fs, SETMFM);
 990         }
 991         swim3_select(fs, RELAX);
 992
 993         release_drive(fs);
 994         return ret;
 995 }
 996
 997 static const struct block_device_operations floppy_fops = {
 998         .open           = floppy_open,
 999         .release        = floppy_release,
1000         .locked_ioctl   = floppy_ioctl,
1001         .media_changed  = floppy_check_change,
1002         .revalidate_disk= floppy_revalidate,
1003 };
1004
1005 static int swim3_add_device(struct macio_dev *mdev, int index)
1006 {
1007         struct device_node *swim = mdev->ofdev.dev.of_node;
1008         struct floppy_state *fs = &floppy_states[index];
1009         int rc = -EBUSY;
1010
1011         /* Check & Request resources */
1012         if (macio_resource_count(mdev) < 2) {
1013                 printk(KERN_WARNING "ifd%d: no address for %s\n",
1014                        index, swim->full_name);
1015                 return -ENXIO;
1016         }
1017         if (macio_irq_count(mdev) < 2) {
1018                 printk(KERN_WARNING "fd%d: no intrs for device %s\n",
1019                         index, swim->full_name);
1020         }
1021         if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
1022                 printk(KERN_ERR "fd%d: can't request mmio resource for %s\n",
1023                        index, swim->full_name);
1024                 return -EBUSY;
1025         }
1026         if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
1027                 printk(KERN_ERR "fd%d: can't request dma resource for %s\n",
1028                        index, swim->full_name);
1029                 macio_release_resource(mdev, 0);
1030                 return -EBUSY;
1031         }
1032         dev_set_drvdata(&mdev->ofdev.dev, fs);
1033
1034         if (mdev->media_bay == NULL)
1035                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1036
1037         memset(fs, 0, sizeof(*fs));
1038         spin_lock_init(&fs->lock);
1039         fs->state = idle;
1040         fs->swim3 = (struct swim3 __iomem *)
1041                 ioremap(macio_resource_start(mdev, 0), 0x200);
1042         if (fs->swim3 == NULL) {
1043                 printk("fd%d: couldn't map registers for %s\n",
1044                        index, swim->full_name);
1045                 rc = -ENOMEM;
1046                 goto out_release;
1047         }
1048         fs->dma = (struct dbdma_regs __iomem *)
1049                 ioremap(macio_resource_start(mdev, 1), 0x200);
1050         if (fs->dma == NULL) {
1051                 printk("fd%d: couldn't map DMA for %s\n",
1052                        index, swim->full_name);
1053                 iounmap(fs->swim3);
1054                 rc = -ENOMEM;
1055                 goto out_release;
1056         }
1057         fs->swim3_intr = macio_irq(mdev, 0);
1058         fs->dma_intr = macio_irq(mdev, 1);
1059         fs->cur_cyl = -1;
1060         fs->cur_sector = -1;
1061         fs->secpercyl = 36;
1062         fs->secpertrack = 18;
1063         fs->total_secs = 2880;
1064         fs->mdev = mdev;
1065         init_waitqueue_head(&fs->wait);
1066
1067         fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1068         memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1069         st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1070
1071         if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1072                 printk(KERN_ERR "fd%d: couldn't request irq %d for %s\n",
1073                        index, fs->swim3_intr, swim->full_name);
1074                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1075                 goto out_unmap;
1076                 return -EBUSY;
1077         }
1078 /*
1079         if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
1080                 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
1081                        fs->dma_intr);
1082                 return -EBUSY;
1083         }
1084 */
1085
1086         init_timer(&fs->timeout);
1087
1088         printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
1089                 mdev->media_bay ? "in media bay" : "");
1090
1091         return 0;
1092
1093  out_unmap:
1094         iounmap(fs->dma);
1095         iounmap(fs->swim3);
1096
1097  out_release:
1098         macio_release_resource(mdev, 0);
1099         macio_release_resource(mdev, 1);
1100
1101         return rc;
1102 }
1103
1104 static int __devinit swim3_attach(struct macio_dev *mdev, const struct of_device_id *match)
1105 {
1106         int i, rc;
1107         struct gendisk *disk;
1108
1109         /* Add the drive */
1110         rc = swim3_add_device(mdev, floppy_count);
1111         if (rc)
1112                 return rc;
1113
1114         /* Now create the queue if not there yet */
1115         if (swim3_queue == NULL) {
1116                 /* If we failed, there isn't much we can do as the driver is still
1117                  * too dumb to remove the device, just bail out
1118                  */
1119                 if (register_blkdev(FLOPPY_MAJOR, "fd"))
1120                         return 0;
1121                 swim3_queue = blk_init_queue(do_fd_request, &swim3_lock);
1122                 if (swim3_queue == NULL) {
1123                         unregister_blkdev(FLOPPY_MAJOR, "fd");
1124                         return 0;
1125                 }
1126         }
1127
1128         /* Now register that disk. Same comment about failure handling */
1129         i = floppy_count++;
1130         disk = disks[i] = alloc_disk(1);
1131         if (disk == NULL)
1132                 return 0;
1133
1134         disk->major = FLOPPY_MAJOR;
1135         disk->first_minor = i;
1136         disk->fops = &floppy_fops;
1137         disk->private_data = &floppy_states[i];
1138         disk->queue = swim3_queue;
1139         disk->flags |= GENHD_FL_REMOVABLE;
1140         sprintf(disk->disk_name, "fd%d", i);
1141         set_capacity(disk, 2880);
1142         add_disk(disk);
1143
1144         return 0;
1145 }
1146
1147 static struct of_device_id swim3_match[] =
1148 {
1149         {
1150         .name           = "swim3",
1151         },
1152         {
1153         .compatible     = "ohare-swim3"
1154         },
1155         {
1156         .compatible     = "swim3"
1157         },
1158 };
1159
1160 static struct macio_driver swim3_driver =
1161 {
1162         .name           = "swim3",
1163         .match_table    = swim3_match,
1164         .probe          = swim3_attach,
1165 #if 0
1166         .suspend        = swim3_suspend,
1167         .resume         = swim3_resume,
1168 #endif
1169 };
1170
1171
1172 int swim3_init(void)
1173 {
1174         macio_register_driver(&swim3_driver);
1175         return 0;
1176 }
1177
1178 module_init(swim3_init)
1179
1180 MODULE_LICENSE("GPL");
1181 MODULE_AUTHOR("Paul Mackerras");
1182 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);