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