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/smp_lock.h>
  29 #include <linux/module.h>
  30 #include <linux/spinlock.h>
  31 #include <asm/io.h>
  32 #include <asm/dbdma.h>
  33 #include <asm/prom.h>
  34 #include <asm/uaccess.h>
  35 #include <asm/mediabay.h>
  36 #include <asm/machdep.h>
  37 #include <asm/pmac_feature.h>
  38
  39 static struct request_queue *swim3_queue;
  40 static struct gendisk *disks[2];
  41 static struct request *fd_req;
  42
  43 #define MAX_FLOPPIES    2
  44
  45 enum swim_state {
  46         idle,
  47         locating,
  48         seeking,
  49         settling,
  50         do_transfer,
  51         jogging,
  52         available,
  53         revalidating,
  54         ejecting
  55 };
  56
  57 #define REG(x)  unsigned char x; char x ## _pad[15];
  58
  59 /*
  60  * The names for these registers mostly represent speculation on my part.
  61  * It will be interesting to see how close they are to the names Apple uses.
  62  */
  63 struct swim3 {
  64         REG(data);
  65         REG(timer);             /* counts down at 1MHz */
  66         REG(error);
  67         REG(mode);
  68         REG(select);            /* controls CA0, CA1, CA2 and LSTRB signals */
  69         REG(setup);
  70         REG(control);           /* writing bits clears them */
  71         REG(status);            /* writing bits sets them in control */
  72         REG(intr);
  73         REG(nseek);             /* # tracks to seek */
  74         REG(ctrack);            /* current track number */
  75         REG(csect);             /* current sector number */
  76         REG(gap3);              /* size of gap 3 in track format */
  77         REG(sector);            /* sector # to read or write */
  78         REG(nsect);             /* # sectors to read or write */
  79         REG(intr_enable);
  80 };
  81
  82 #define control_bic     control
  83 #define control_bis     status
  84
  85 /* Bits in select register */
  86 #define CA_MASK         7
  87 #define LSTRB           8
  88
  89 /* Bits in control register */
  90 #define DO_SEEK         0x80
  91 #define FORMAT          0x40
  92 #define SELECT          0x20
  93 #define WRITE_SECTORS   0x10
  94 #define DO_ACTION       0x08
  95 #define DRIVE2_ENABLE   0x04
  96 #define DRIVE_ENABLE    0x02
  97 #define INTR_ENABLE     0x01
  98
  99 /* Bits in status register */
 100 #define FIFO_1BYTE      0x80
 101 #define FIFO_2BYTE      0x40
 102 #define ERROR           0x20
 103 #define DATA            0x08
 104 #define RDDATA          0x04
 105 #define INTR_PENDING    0x02
 106 #define MARK_BYTE       0x01
 107
 108 /* Bits in intr and intr_enable registers */
 109 #define ERROR_INTR      0x20
 110 #define DATA_CHANGED    0x10
 111 #define TRANSFER_DONE   0x08
 112 #define SEEN_SECTOR     0x04
 113 #define SEEK_DONE       0x02
 114 #define TIMER_DONE      0x01
 115
 116 /* Bits in error register */
 117 #define ERR_DATA_CRC    0x80
 118 #define ERR_ADDR_CRC    0x40
 119 #define ERR_OVERRUN     0x04
 120 #define ERR_UNDERRUN    0x01
 121
 122 /* Bits in setup register */
 123 #define S_SW_RESET      0x80
 124 #define S_GCR_WRITE     0x40
 125 #define S_IBM_DRIVE     0x20
 126 #define S_TEST_MODE     0x10
 127 #define S_FCLK_DIV2     0x08
 128 #define S_GCR           0x04
 129 #define S_COPY_PROT     0x02
 130 #define S_INV_WDATA     0x01
 131
 132 /* Select values for swim3_action */
 133 #define SEEK_POSITIVE   0
 134 #define SEEK_NEGATIVE   4
 135 #define STEP            1
 136 #define MOTOR_ON        2
 137 #define MOTOR_OFF       6
 138 #define INDEX           3
 139 #define EJECT           7
 140 #define SETMFM          9
 141 #define SETGCR          13
 142
 143 /* Select values for swim3_select and swim3_readbit */
 144 #define STEP_DIR        0
 145 #define STEPPING        1
 146 #define MOTOR_ON        2
 147 #define RELAX           3       /* also eject in progress */
 148 #define READ_DATA_0     4
 149 #define TWOMEG_DRIVE    5
 150 #define SINGLE_SIDED    6       /* drive or diskette is 4MB type? */
 151 #define DRIVE_PRESENT   7
 152 #define DISK_IN         8
 153 #define WRITE_PROT      9
 154 #define TRACK_ZERO      10
 155 #define TACHO           11
 156 #define READ_DATA_1     12
 157 #define MFM_MODE        13
 158 #define SEEK_COMPLETE   14
 159 #define ONEMEG_MEDIA    15
 160
 161 /* Definitions of values used in writing and formatting */
 162 #define DATA_ESCAPE     0x99
 163 #define GCR_SYNC_EXC    0x3f
 164 #define GCR_SYNC_CONV   0x80
 165 #define GCR_FIRST_MARK  0xd5
 166 #define GCR_SECOND_MARK 0xaa
 167 #define GCR_ADDR_MARK   "\xd5\xaa\x00"
 168 #define GCR_DATA_MARK   "\xd5\xaa\x0b"
 169 #define GCR_SLIP_BYTE   "\x27\xaa"
 170 #define GCR_SELF_SYNC   "\x3f\xbf\x1e\x34\x3c\x3f"
 171
 172 #define DATA_99         "\x99\x99"
 173 #define MFM_ADDR_MARK   "\x99\xa1\x99\xa1\x99\xa1\x99\xfe"
 174 #define MFM_INDEX_MARK  "\x99\xc2\x99\xc2\x99\xc2\x99\xfc"
 175 #define MFM_GAP_LEN     12
 176
 177 struct floppy_state {
 178         enum swim_state state;
 179         spinlock_t lock;
 180         struct swim3 __iomem *swim3;    /* hardware registers */
 181         struct dbdma_regs __iomem *dma; /* DMA controller registers */
 182         int     swim3_intr;     /* interrupt number for SWIM3 */
 183         int     dma_intr;       /* interrupt number for DMA channel */
 184         int     cur_cyl;        /* cylinder head is on, or -1 */
 185         int     cur_sector;     /* last sector we saw go past */
 186         int     req_cyl;        /* the cylinder for the current r/w request */
 187         int     head;           /* head number ditto */
 188         int     req_sector;     /* sector number ditto */
 189         int     scount;         /* # sectors we're transferring at present */
 190         int     retries;
 191         int     settle_time;
 192         int     secpercyl;      /* disk geometry information */
 193         int     secpertrack;
 194         int     total_secs;
 195         int     write_prot;     /* 1 if write-protected, 0 if not, -1 dunno */
 196         struct dbdma_cmd *dma_cmd;
 197         int     ref_count;
 198         int     expect_cyl;
 199         struct timer_list timeout;
 200         int     timeout_pending;
 201         int     ejected;
 202         wait_queue_head_t wait;
 203         int     wanted;
 204         struct macio_dev *mdev;
 205         char    dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
 206 };
 207
 208 static struct floppy_state floppy_states[MAX_FLOPPIES];
 209 static int floppy_count = 0;
 210 static DEFINE_SPINLOCK(swim3_lock);
 211
 212 static unsigned short write_preamble[] = {
 213         0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */
 214         0, 0, 0, 0, 0, 0,                       /* sync field */
 215         0x99a1, 0x99a1, 0x99a1, 0x99fb,         /* data address mark */
 216         0x990f                                  /* no escape for 512 bytes */
 217 };
 218
 219 static unsigned short write_postamble[] = {
 220         0x9904,                                 /* insert CRC */
 221         0x4e4e, 0x4e4e,
 222         0x9908,                                 /* stop writing */
 223         0, 0, 0, 0, 0, 0
 224 };
 225
 226 static void swim3_select(struct floppy_state *fs, int sel);
 227 static void swim3_action(struct floppy_state *fs, int action);
 228 static int swim3_readbit(struct floppy_state *fs, int bit);
 229 static void do_fd_request(struct request_queue * q);
 230 static void start_request(struct floppy_state *fs);
 231 static void set_timeout(struct floppy_state *fs, int nticks,
 232                         void (*proc)(unsigned long));
 233 static void scan_track(struct floppy_state *fs);
 234 static void seek_track(struct floppy_state *fs, int n);
 235 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count);
 236 static void setup_transfer(struct floppy_state *fs);
 237 static void act(struct floppy_state *fs);
 238 static void scan_timeout(unsigned long data);
 239 static void seek_timeout(unsigned long data);
 240 static void settle_timeout(unsigned long data);
 241 static void xfer_timeout(unsigned long data);
 242 static irqreturn_t swim3_interrupt(int irq, void *dev_id);
 243 /*static void fd_dma_interrupt(int irq, void *dev_id);*/
 244 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 245                       int interruptible);
 246 static void release_drive(struct floppy_state *fs);
 247 static int fd_eject(struct floppy_state *fs);
 248 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
 249                         unsigned int cmd, unsigned long param);
 250 static int floppy_open(struct block_device *bdev, fmode_t mode);
 251 static int floppy_release(struct gendisk *disk, fmode_t mode);
 252 static int floppy_check_change(struct gendisk *disk);
 253 static int floppy_revalidate(struct gendisk *disk);
 254
 255 static bool swim3_end_request(int err, unsigned int nr_bytes)
 256 {
 257         if (__blk_end_request(fd_req, err, nr_bytes))
 258                 return true;
 259
 260         fd_req = NULL;
 261         return false;
 262 }
 263
 264 static bool swim3_end_request_cur(int err)
 265 {
 266         return swim3_end_request(err, blk_rq_cur_bytes(fd_req));
 267 }
 268
 269 static void swim3_select(struct floppy_state *fs, int sel)
 270 {
 271         struct swim3 __iomem *sw = fs->swim3;
 272
 273         out_8(&sw->select, RELAX);
 274         if (sel & 8)
 275                 out_8(&sw->control_bis, SELECT);
 276         else
 277                 out_8(&sw->control_bic, SELECT);
 278         out_8(&sw->select, sel & CA_MASK);
 279 }
 280
 281 static void swim3_action(struct floppy_state *fs, int action)
 282 {
 283         struct swim3 __iomem *sw = fs->swim3;
 284
 285         swim3_select(fs, action);
 286         udelay(1);
 287         out_8(&sw->select, sw->select | LSTRB);
 288         udelay(2);
 289         out_8(&sw->select, sw->select & ~LSTRB);
 290         udelay(1);
 291 }
 292
 293 static int swim3_readbit(struct floppy_state *fs, int bit)
 294 {
 295         struct swim3 __iomem *sw = fs->swim3;
 296         int stat;
 297
 298         swim3_select(fs, bit);
 299         udelay(1);
 300         stat = in_8(&sw->status);
 301         return (stat & DATA) == 0;
 302 }
 303
 304 static void do_fd_request(struct request_queue * q)
 305 {
 306         int i;
 307
 308         for(i=0; i<floppy_count; i++) {
 309                 struct floppy_state *fs = &floppy_states[i];
 310                 if (fs->mdev->media_bay &&
 311                     check_media_bay(fs->mdev->media_bay) != MB_FD)
 312                         continue;
 313                 start_request(fs);
 314         }
 315 }
 316
 317 static void start_request(struct floppy_state *fs)
 318 {
 319         struct request *req;
 320         unsigned long x;
 321
 322         if (fs->state == idle && fs->wanted) {
 323                 fs->state = available;
 324                 wake_up(&fs->wait);
 325                 return;
 326         }
 327         while (fs->state == idle) {
 328                 if (!fd_req) {
 329                         fd_req = blk_fetch_request(swim3_queue);
 330                         if (!fd_req)
 331                                 break;
 332                 }
 333                 req = fd_req;
 334 #if 0
 335                 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n",
 336                        req->rq_disk->disk_name, req->cmd,
 337                        (long)blk_rq_pos(req), blk_rq_sectors(req), req->buffer);
 338                 printk("           errors=%d current_nr_sectors=%u\n",
 339                        req->errors, blk_rq_cur_sectors(req));
 340 #endif
 341
 342                 if (blk_rq_pos(req) >= fs->total_secs) {
 343                         swim3_end_request_cur(-EIO);
 344                         continue;
 345                 }
 346                 if (fs->ejected) {
 347                         swim3_end_request_cur(-EIO);
 348                         continue;
 349                 }
 350
 351                 if (rq_data_dir(req) == WRITE) {
 352                         if (fs->write_prot < 0)
 353                                 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 354                         if (fs->write_prot) {
 355                                 swim3_end_request_cur(-EIO);
 356                                 continue;
 357                         }
 358                 }
 359
 360                 /* Do not remove the cast. blk_rq_pos(req) is now a
 361                  * sector_t and can be 64 bits, but it will never go
 362                  * past 32 bits for this driver anyway, so we can
 363                  * safely cast it down and not have to do a 64/32
 364                  * division
 365                  */
 366                 fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl;
 367                 x = ((long)blk_rq_pos(req)) % fs->secpercyl;
 368                 fs->head = x / fs->secpertrack;
 369                 fs->req_sector = x % fs->secpertrack + 1;
 370                 fd_req = req;
 371                 fs->state = do_transfer;
 372                 fs->retries = 0;
 373
 374                 act(fs);
 375         }
 376 }
 377
 378 static void set_timeout(struct floppy_state *fs, int nticks,
 379                         void (*proc)(unsigned long))
 380 {
 381         unsigned long flags;
 382
 383         spin_lock_irqsave(&fs->lock, flags);
 384         if (fs->timeout_pending)
 385                 del_timer(&fs->timeout);
 386         fs->timeout.expires = jiffies + nticks;
 387         fs->timeout.function = proc;
 388         fs->timeout.data = (unsigned long) fs;
 389         add_timer(&fs->timeout);
 390         fs->timeout_pending = 1;
 391         spin_unlock_irqrestore(&fs->lock, flags);
 392 }
 393
 394 static inline void scan_track(struct floppy_state *fs)
 395 {
 396         struct swim3 __iomem *sw = fs->swim3;
 397
 398         swim3_select(fs, READ_DATA_0);
 399         in_8(&sw->intr);                /* clear SEEN_SECTOR bit */
 400         in_8(&sw->error);
 401         out_8(&sw->intr_enable, SEEN_SECTOR);
 402         out_8(&sw->control_bis, DO_ACTION);
 403         /* enable intr when track found */
 404         set_timeout(fs, HZ, scan_timeout);      /* enable timeout */
 405 }
 406
 407 static inline void seek_track(struct floppy_state *fs, int n)
 408 {
 409         struct swim3 __iomem *sw = fs->swim3;
 410
 411         if (n >= 0) {
 412                 swim3_action(fs, SEEK_POSITIVE);
 413                 sw->nseek = n;
 414         } else {
 415                 swim3_action(fs, SEEK_NEGATIVE);
 416                 sw->nseek = -n;
 417         }
 418         fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
 419         swim3_select(fs, STEP);
 420         in_8(&sw->error);
 421         /* enable intr when seek finished */
 422         out_8(&sw->intr_enable, SEEK_DONE);
 423         out_8(&sw->control_bis, DO_SEEK);
 424         set_timeout(fs, 3*HZ, seek_timeout);    /* enable timeout */
 425         fs->settle_time = 0;
 426 }
 427
 428 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
 429                             void *buf, int count)
 430 {
 431         st_le16(&cp->req_count, count);
 432         st_le16(&cp->command, cmd);
 433         st_le32(&cp->phy_addr, virt_to_bus(buf));
 434         cp->xfer_status = 0;
 435 }
 436
 437 static inline void setup_transfer(struct floppy_state *fs)
 438 {
 439         int n;
 440         struct swim3 __iomem *sw = fs->swim3;
 441         struct dbdma_cmd *cp = fs->dma_cmd;
 442         struct dbdma_regs __iomem *dr = fs->dma;
 443
 444         if (blk_rq_cur_sectors(fd_req) <= 0) {
 445                 printk(KERN_ERR "swim3: transfer 0 sectors?\n");
 446                 return;
 447         }
 448         if (rq_data_dir(fd_req) == WRITE)
 449                 n = 1;
 450         else {
 451                 n = fs->secpertrack - fs->req_sector + 1;
 452                 if (n > blk_rq_cur_sectors(fd_req))
 453                         n = blk_rq_cur_sectors(fd_req);
 454         }
 455         fs->scount = n;
 456         swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
 457         out_8(&sw->sector, fs->req_sector);
 458         out_8(&sw->nsect, n);
 459         out_8(&sw->gap3, 0);
 460         out_le32(&dr->cmdptr, virt_to_bus(cp));
 461         if (rq_data_dir(fd_req) == WRITE) {
 462                 /* Set up 3 dma commands: write preamble, data, postamble */
 463                 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
 464                 ++cp;
 465                 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512);
 466                 ++cp;
 467                 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
 468         } else {
 469                 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512);
 470         }
 471         ++cp;
 472         out_le16(&cp->command, DBDMA_STOP);
 473         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 474         in_8(&sw->error);
 475         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 476         if (rq_data_dir(fd_req) == WRITE)
 477                 out_8(&sw->control_bis, WRITE_SECTORS);
 478         in_8(&sw->intr);
 479         out_le32(&dr->control, (RUN << 16) | RUN);
 480         /* enable intr when transfer complete */
 481         out_8(&sw->intr_enable, TRANSFER_DONE);
 482         out_8(&sw->control_bis, DO_ACTION);
 483         set_timeout(fs, 2*HZ, xfer_timeout);    /* enable timeout */
 484 }
 485
 486 static void act(struct floppy_state *fs)
 487 {
 488         for (;;) {
 489                 switch (fs->state) {
 490                 case idle:
 491                         return;         /* XXX shouldn't get here */
 492
 493                 case locating:
 494                         if (swim3_readbit(fs, TRACK_ZERO)) {
 495                                 fs->cur_cyl = 0;
 496                                 if (fs->req_cyl == 0)
 497                                         fs->state = do_transfer;
 498                                 else
 499                                         fs->state = seeking;
 500                                 break;
 501                         }
 502                         scan_track(fs);
 503                         return;
 504
 505                 case seeking:
 506                         if (fs->cur_cyl < 0) {
 507                                 fs->expect_cyl = -1;
 508                                 fs->state = locating;
 509                                 break;
 510                         }
 511                         if (fs->req_cyl == fs->cur_cyl) {
 512                                 printk("whoops, seeking 0\n");
 513                                 fs->state = do_transfer;
 514                                 break;
 515                         }
 516                         seek_track(fs, fs->req_cyl - fs->cur_cyl);
 517                         return;
 518
 519                 case settling:
 520                         /* check for SEEK_COMPLETE after 30ms */
 521                         fs->settle_time = (HZ + 32) / 33;
 522                         set_timeout(fs, fs->settle_time, settle_timeout);
 523                         return;
 524
 525                 case do_transfer:
 526                         if (fs->cur_cyl != fs->req_cyl) {
 527                                 if (fs->retries > 5) {
 528                                         swim3_end_request_cur(-EIO);
 529                                         fs->state = idle;
 530                                         return;
 531                                 }
 532                                 fs->state = seeking;
 533                                 break;
 534                         }
 535                         setup_transfer(fs);
 536                         return;
 537
 538                 case jogging:
 539                         seek_track(fs, -5);
 540                         return;
 541
 542                 default:
 543                         printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
 544                         return;
 545                 }
 546         }
 547 }
 548
 549 static void scan_timeout(unsigned long data)
 550 {
 551         struct floppy_state *fs = (struct floppy_state *) data;
 552         struct swim3 __iomem *sw = fs->swim3;
 553
 554         fs->timeout_pending = 0;
 555         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 556         out_8(&sw->select, RELAX);
 557         out_8(&sw->intr_enable, 0);
 558         fs->cur_cyl = -1;
 559         if (fs->retries > 5) {
 560                 swim3_end_request_cur(-EIO);
 561                 fs->state = idle;
 562                 start_request(fs);
 563         } else {
 564                 fs->state = jogging;
 565                 act(fs);
 566         }
 567 }
 568
 569 static void seek_timeout(unsigned long data)
 570 {
 571         struct floppy_state *fs = (struct floppy_state *) data;
 572         struct swim3 __iomem *sw = fs->swim3;
 573
 574         fs->timeout_pending = 0;
 575         out_8(&sw->control_bic, DO_SEEK);
 576         out_8(&sw->select, RELAX);
 577         out_8(&sw->intr_enable, 0);
 578         printk(KERN_ERR "swim3: seek timeout\n");
 579         swim3_end_request_cur(-EIO);
 580         fs->state = idle;
 581         start_request(fs);
 582 }
 583
 584 static void settle_timeout(unsigned long data)
 585 {
 586         struct floppy_state *fs = (struct floppy_state *) data;
 587         struct swim3 __iomem *sw = fs->swim3;
 588
 589         fs->timeout_pending = 0;
 590         if (swim3_readbit(fs, SEEK_COMPLETE)) {
 591                 out_8(&sw->select, RELAX);
 592                 fs->state = locating;
 593                 act(fs);
 594                 return;
 595         }
 596         out_8(&sw->select, RELAX);
 597         if (fs->settle_time < 2*HZ) {
 598                 ++fs->settle_time;
 599                 set_timeout(fs, 1, settle_timeout);
 600                 return;
 601         }
 602         printk(KERN_ERR "swim3: seek settle timeout\n");
 603         swim3_end_request_cur(-EIO);
 604         fs->state = idle;
 605         start_request(fs);
 606 }
 607
 608 static void xfer_timeout(unsigned long data)
 609 {
 610         struct floppy_state *fs = (struct floppy_state *) data;
 611         struct swim3 __iomem *sw = fs->swim3;
 612         struct dbdma_regs __iomem *dr = fs->dma;
 613         int n;
 614
 615         fs->timeout_pending = 0;
 616         out_le32(&dr->control, RUN << 16);
 617         /* We must wait a bit for dbdma to stop */
 618         for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
 619                 udelay(1);
 620         out_8(&sw->intr_enable, 0);
 621         out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 622         out_8(&sw->select, RELAX);
 623         printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
 624                (rq_data_dir(fd_req)==WRITE? "writ": "read"),
 625                (long)blk_rq_pos(fd_req));
 626         swim3_end_request_cur(-EIO);
 627         fs->state = idle;
 628         start_request(fs);
 629 }
 630
 631 static irqreturn_t swim3_interrupt(int irq, void *dev_id)
 632 {
 633         struct floppy_state *fs = (struct floppy_state *) dev_id;
 634         struct swim3 __iomem *sw = fs->swim3;
 635         int intr, err, n;
 636         int stat, resid;
 637         struct dbdma_regs __iomem *dr;
 638         struct dbdma_cmd *cp;
 639
 640         intr = in_8(&sw->intr);
 641         err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
 642         if ((intr & ERROR_INTR) && fs->state != do_transfer)
 643                 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%x, intr=%x, err=%x\n",
 644                        fs->state, rq_data_dir(fd_req), intr, err);
 645         switch (fs->state) {
 646         case locating:
 647                 if (intr & SEEN_SECTOR) {
 648                         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 649                         out_8(&sw->select, RELAX);
 650                         out_8(&sw->intr_enable, 0);
 651                         del_timer(&fs->timeout);
 652                         fs->timeout_pending = 0;
 653                         if (sw->ctrack == 0xff) {
 654                                 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
 655                                 fs->cur_cyl = -1;
 656                                 if (fs->retries > 5) {
 657                                         swim3_end_request_cur(-EIO);
 658                                         fs->state = idle;
 659                                         start_request(fs);
 660                                 } else {
 661                                         fs->state = jogging;
 662                                         act(fs);
 663                                 }
 664                                 break;
 665                         }
 666                         fs->cur_cyl = sw->ctrack;
 667                         fs->cur_sector = sw->csect;
 668                         if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
 669                                 printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
 670                                        fs->expect_cyl, fs->cur_cyl);
 671                         fs->state = do_transfer;
 672                         act(fs);
 673                 }
 674                 break;
 675         case seeking:
 676         case jogging:
 677                 if (sw->nseek == 0) {
 678                         out_8(&sw->control_bic, DO_SEEK);
 679                         out_8(&sw->select, RELAX);
 680                         out_8(&sw->intr_enable, 0);
 681                         del_timer(&fs->timeout);
 682                         fs->timeout_pending = 0;
 683                         if (fs->state == seeking)
 684                                 ++fs->retries;
 685                         fs->state = settling;
 686                         act(fs);
 687                 }
 688                 break;
 689         case settling:
 690                 out_8(&sw->intr_enable, 0);
 691                 del_timer(&fs->timeout);
 692                 fs->timeout_pending = 0;
 693                 act(fs);
 694                 break;
 695         case do_transfer:
 696                 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
 697                         break;
 698                 out_8(&sw->intr_enable, 0);
 699                 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 700                 out_8(&sw->select, RELAX);
 701                 del_timer(&fs->timeout);
 702                 fs->timeout_pending = 0;
 703                 dr = fs->dma;
 704                 cp = fs->dma_cmd;
 705                 if (rq_data_dir(fd_req) == WRITE)
 706                         ++cp;
 707                 /*
 708                  * Check that the main data transfer has finished.
 709                  * On writing, the swim3 sometimes doesn't use
 710                  * up all the bytes of the postamble, so we can still
 711                  * see DMA active here.  That doesn't matter as long
 712                  * as all the sector data has been transferred.
 713                  */
 714                 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
 715                         /* wait a little while for DMA to complete */
 716                         for (n = 0; n < 100; ++n) {
 717                                 if (cp->xfer_status != 0)
 718                                         break;
 719                                 udelay(1);
 720                                 barrier();
 721                         }
 722                 }
 723                 /* turn off DMA */
 724                 out_le32(&dr->control, (RUN | PAUSE) << 16);
 725                 stat = ld_le16(&cp->xfer_status);
 726                 resid = ld_le16(&cp->res_count);
 727                 if (intr & ERROR_INTR) {
 728                         n = fs->scount - 1 - resid / 512;
 729                         if (n > 0) {
 730                                 blk_update_request(fd_req, 0, n << 9);
 731                                 fs->req_sector += n;
 732                         }
 733                         if (fs->retries < 5) {
 734                                 ++fs->retries;
 735                                 act(fs);
 736                         } else {
 737                                 printk("swim3: error %sing block %ld (err=%x)\n",
 738                                        rq_data_dir(fd_req) == WRITE? "writ": "read",
 739                                        (long)blk_rq_pos(fd_req), err);
 740                                 swim3_end_request_cur(-EIO);
 741                                 fs->state = idle;
 742                         }
 743                 } else {
 744                         if ((stat & ACTIVE) == 0 || resid != 0) {
 745                                 /* musta been an error */
 746                                 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
 747                                 printk(KERN_ERR "  state=%d, dir=%x, intr=%x, err=%x\n",
 748                                        fs->state, rq_data_dir(fd_req), intr, err);
 749                                 swim3_end_request_cur(-EIO);
 750                                 fs->state = idle;
 751                                 start_request(fs);
 752                                 break;
 753                         }
 754                         if (swim3_end_request(0, fs->scount << 9)) {
 755                                 fs->req_sector += fs->scount;
 756                                 if (fs->req_sector > fs->secpertrack) {
 757                                         fs->req_sector -= fs->secpertrack;
 758                                         if (++fs->head > 1) {
 759                                                 fs->head = 0;
 760                                                 ++fs->req_cyl;
 761                                         }
 762                                 }
 763                                 act(fs);
 764                         } else
 765                                 fs->state = idle;
 766                 }
 767                 if (fs->state == idle)
 768                         start_request(fs);
 769                 break;
 770         default:
 771                 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);
 772         }
 773         return IRQ_HANDLED;
 774 }
 775
 776 /*
 777 static void fd_dma_interrupt(int irq, void *dev_id)
 778 {
 779 }
 780 */
 781
 782 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 783                       int interruptible)
 784 {
 785         unsigned long flags;
 786
 787         spin_lock_irqsave(&fs->lock, flags);
 788         if (fs->state != idle) {
 789                 ++fs->wanted;
 790                 while (fs->state != available) {
 791                         if (interruptible && signal_pending(current)) {
 792                                 --fs->wanted;
 793                                 spin_unlock_irqrestore(&fs->lock, flags);
 794                                 return -EINTR;
 795                         }
 796                         interruptible_sleep_on(&fs->wait);
 797                 }
 798                 --fs->wanted;
 799         }
 800         fs->state = state;
 801         spin_unlock_irqrestore(&fs->lock, flags);
 802         return 0;
 803 }
 804
 805 static void release_drive(struct floppy_state *fs)
 806 {
 807         unsigned long flags;
 808
 809         spin_lock_irqsave(&fs->lock, flags);
 810         fs->state = idle;
 811         start_request(fs);
 812         spin_unlock_irqrestore(&fs->lock, flags);
 813 }
 814
 815 static int fd_eject(struct floppy_state *fs)
 816 {
 817         int err, n;
 818
 819         err = grab_drive(fs, ejecting, 1);
 820         if (err)
 821                 return err;
 822         swim3_action(fs, EJECT);
 823         for (n = 20; n > 0; --n) {
 824                 if (signal_pending(current)) {
 825                         err = -EINTR;
 826                         break;
 827                 }
 828                 swim3_select(fs, RELAX);
 829                 schedule_timeout_interruptible(1);
 830                 if (swim3_readbit(fs, DISK_IN) == 0)
 831                         break;
 832         }
 833         swim3_select(fs, RELAX);
 834         udelay(150);
 835         fs->ejected = 1;
 836         release_drive(fs);
 837         return err;
 838 }
 839
 840 static struct floppy_struct floppy_type =
 841         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL };    /*  7 1.44MB 3.5"   */
 842
 843 static int floppy_locked_ioctl(struct block_device *bdev, fmode_t mode,
 844                         unsigned int cmd, unsigned long param)
 845 {
 846         struct floppy_state *fs = bdev->bd_disk->private_data;
 847         int err;
 848
 849         if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
 850                 return -EPERM;
 851
 852         if (fs->mdev->media_bay &&
 853             check_media_bay(fs->mdev->media_bay) != MB_FD)
 854                 return -ENXIO;
 855
 856         switch (cmd) {
 857         case FDEJECT:
 858                 if (fs->ref_count != 1)
 859                         return -EBUSY;
 860                 err = fd_eject(fs);
 861                 return err;
 862         case FDGETPRM:
 863                 if (copy_to_user((void __user *) param, &floppy_type,
 864                                  sizeof(struct floppy_struct)))
 865                         return -EFAULT;
 866                 return 0;
 867         }
 868         return -ENOTTY;
 869 }
 870
 871 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
 872                                  unsigned int cmd, unsigned long param)
 873 {
 874         int ret;
 875
 876         lock_kernel();
 877         ret = floppy_locked_ioctl(bdev, mode, cmd, param);
 878         unlock_kernel();
 879
 880         return ret;
 881 }
 882
 883 static int floppy_open(struct block_device *bdev, fmode_t mode)
 884 {
 885         struct floppy_state *fs = bdev->bd_disk->private_data;
 886         struct swim3 __iomem *sw = fs->swim3;
 887         int n, err = 0;
 888
 889         if (fs->ref_count == 0) {
 890                 if (fs->mdev->media_bay &&
 891                     check_media_bay(fs->mdev->media_bay) != MB_FD)
 892                         return -ENXIO;
 893                 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
 894                 out_8(&sw->control_bic, 0xff);
 895                 out_8(&sw->mode, 0x95);
 896                 udelay(10);
 897                 out_8(&sw->intr_enable, 0);
 898                 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
 899                 swim3_action(fs, MOTOR_ON);
 900                 fs->write_prot = -1;
 901                 fs->cur_cyl = -1;
 902                 for (n = 0; n < 2 * HZ; ++n) {
 903                         if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
 904                                 break;
 905                         if (signal_pending(current)) {
 906                                 err = -EINTR;
 907                                 break;
 908                         }
 909                         swim3_select(fs, RELAX);
 910                         schedule_timeout_interruptible(1);
 911                 }
 912                 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
 913                                  || swim3_readbit(fs, DISK_IN) == 0))
 914                         err = -ENXIO;
 915                 swim3_action(fs, SETMFM);
 916                 swim3_select(fs, RELAX);
 917
 918         } else if (fs->ref_count == -1 || mode & FMODE_EXCL)
 919                 return -EBUSY;
 920
 921         if (err == 0 && (mode & FMODE_NDELAY) == 0
 922             && (mode & (FMODE_READ|FMODE_WRITE))) {
 923                 check_disk_change(bdev);
 924                 if (fs->ejected)
 925                         err = -ENXIO;
 926         }
 927
 928         if (err == 0 && (mode & FMODE_WRITE)) {
 929                 if (fs->write_prot < 0)
 930                         fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 931                 if (fs->write_prot)
 932                         err = -EROFS;
 933         }
 934
 935         if (err) {
 936                 if (fs->ref_count == 0) {
 937                         swim3_action(fs, MOTOR_OFF);
 938                         out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
 939                         swim3_select(fs, RELAX);
 940                 }
 941                 return err;
 942         }
 943
 944         if (mode & FMODE_EXCL)
 945                 fs->ref_count = -1;
 946         else
 947                 ++fs->ref_count;
 948
 949         return 0;
 950 }
 951
 952 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
 953 {
 954         int ret;
 955
 956         lock_kernel();
 957         ret = floppy_open(bdev, mode);
 958         unlock_kernel();
 959
 960         return ret;
 961 }
 962
 963 static int floppy_release(struct gendisk *disk, fmode_t mode)
 964 {
 965         struct floppy_state *fs = disk->private_data;
 966         struct swim3 __iomem *sw = fs->swim3;
 967         lock_kernel();
 968         if (fs->ref_count > 0 && --fs->ref_count == 0) {
 969                 swim3_action(fs, MOTOR_OFF);
 970                 out_8(&sw->control_bic, 0xff);
 971                 swim3_select(fs, RELAX);
 972         }
 973         unlock_kernel();
 974         return 0;
 975 }
 976
 977 static int floppy_check_change(struct gendisk *disk)
 978 {
 979         struct floppy_state *fs = disk->private_data;
 980         return fs->ejected;
 981 }
 982
 983 static int floppy_revalidate(struct gendisk *disk)
 984 {
 985         struct floppy_state *fs = disk->private_data;
 986         struct swim3 __iomem *sw;
 987         int ret, n;
 988
 989         if (fs->mdev->media_bay &&
 990             check_media_bay(fs->mdev->media_bay) != MB_FD)
 991                 return -ENXIO;
 992
 993         sw = fs->swim3;
 994         grab_drive(fs, revalidating, 0);
 995         out_8(&sw->intr_enable, 0);
 996         out_8(&sw->control_bis, DRIVE_ENABLE);
 997         swim3_action(fs, MOTOR_ON);     /* necessary? */
 998         fs->write_prot = -1;
 999         fs->cur_cyl = -1;
1000         mdelay(1);
1001         for (n = HZ; n > 0; --n) {
1002                 if (swim3_readbit(fs, SEEK_COMPLETE))
1003                         break;
1004                 if (signal_pending(current))
1005                         break;
1006                 swim3_select(fs, RELAX);
1007                 schedule_timeout_interruptible(1);
1008         }
1009         ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
1010                 || swim3_readbit(fs, DISK_IN) == 0;
1011         if (ret)
1012                 swim3_action(fs, MOTOR_OFF);
1013         else {
1014                 fs->ejected = 0;
1015                 swim3_action(fs, SETMFM);
1016         }
1017         swim3_select(fs, RELAX);
1018
1019         release_drive(fs);
1020         return ret;
1021 }
1022
1023 static const struct block_device_operations floppy_fops = {
1024         .open           = floppy_unlocked_open,
1025         .release        = floppy_release,
1026         .ioctl          = floppy_ioctl,
1027         .media_changed  = floppy_check_change,
1028         .revalidate_disk= floppy_revalidate,
1029 };
1030
1031 static int swim3_add_device(struct macio_dev *mdev, int index)
1032 {
1033         struct device_node *swim = mdev->ofdev.dev.of_node;
1034         struct floppy_state *fs = &floppy_states[index];
1035         int rc = -EBUSY;
1036
1037         /* Check & Request resources */
1038         if (macio_resource_count(mdev) < 2) {
1039                 printk(KERN_WARNING "ifd%d: no address for %s\n",
1040                        index, swim->full_name);
1041                 return -ENXIO;
1042         }
1043         if (macio_irq_count(mdev) < 2) {
1044                 printk(KERN_WARNING "fd%d: no intrs for device %s\n",
1045                         index, swim->full_name);
1046         }
1047         if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
1048                 printk(KERN_ERR "fd%d: can't request mmio resource for %s\n",
1049                        index, swim->full_name);
1050                 return -EBUSY;
1051         }
1052         if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
1053                 printk(KERN_ERR "fd%d: can't request dma resource for %s\n",
1054                        index, swim->full_name);
1055                 macio_release_resource(mdev, 0);
1056                 return -EBUSY;
1057         }
1058         dev_set_drvdata(&mdev->ofdev.dev, fs);
1059
1060         if (mdev->media_bay == NULL)
1061                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1062
1063         memset(fs, 0, sizeof(*fs));
1064         spin_lock_init(&fs->lock);
1065         fs->state = idle;
1066         fs->swim3 = (struct swim3 __iomem *)
1067                 ioremap(macio_resource_start(mdev, 0), 0x200);
1068         if (fs->swim3 == NULL) {
1069                 printk("fd%d: couldn't map registers for %s\n",
1070                        index, swim->full_name);
1071                 rc = -ENOMEM;
1072                 goto out_release;
1073         }
1074         fs->dma = (struct dbdma_regs __iomem *)
1075                 ioremap(macio_resource_start(mdev, 1), 0x200);
1076         if (fs->dma == NULL) {
1077                 printk("fd%d: couldn't map DMA for %s\n",
1078                        index, swim->full_name);
1079                 iounmap(fs->swim3);
1080                 rc = -ENOMEM;
1081                 goto out_release;
1082         }
1083         fs->swim3_intr = macio_irq(mdev, 0);
1084         fs->dma_intr = macio_irq(mdev, 1);
1085         fs->cur_cyl = -1;
1086         fs->cur_sector = -1;
1087         fs->secpercyl = 36;
1088         fs->secpertrack = 18;
1089         fs->total_secs = 2880;
1090         fs->mdev = mdev;
1091         init_waitqueue_head(&fs->wait);
1092
1093         fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1094         memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1095         st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1096
1097         if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1098                 printk(KERN_ERR "fd%d: couldn't request irq %d for %s\n",
1099                        index, fs->swim3_intr, swim->full_name);
1100                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1101                 goto out_unmap;
1102                 return -EBUSY;
1103         }
1104 /*
1105         if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
1106                 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
1107                        fs->dma_intr);
1108                 return -EBUSY;
1109         }
1110 */
1111
1112         init_timer(&fs->timeout);
1113
1114         printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
1115                 mdev->media_bay ? "in media bay" : "");
1116
1117         return 0;
1118
1119  out_unmap:
1120         iounmap(fs->dma);
1121         iounmap(fs->swim3);
1122
1123  out_release:
1124         macio_release_resource(mdev, 0);
1125         macio_release_resource(mdev, 1);
1126
1127         return rc;
1128 }
1129
1130 static int __devinit swim3_attach(struct macio_dev *mdev, const struct of_device_id *match)
1131 {
1132         int i, rc;
1133         struct gendisk *disk;
1134
1135         /* Add the drive */
1136         rc = swim3_add_device(mdev, floppy_count);
1137         if (rc)
1138                 return rc;
1139
1140         /* Now create the queue if not there yet */
1141         if (swim3_queue == NULL) {
1142                 /* If we failed, there isn't much we can do as the driver is still
1143                  * too dumb to remove the device, just bail out
1144                  */
1145                 if (register_blkdev(FLOPPY_MAJOR, "fd"))
1146                         return 0;
1147                 swim3_queue = blk_init_queue(do_fd_request, &swim3_lock);
1148                 if (swim3_queue == NULL) {
1149                         unregister_blkdev(FLOPPY_MAJOR, "fd");
1150                         return 0;
1151                 }
1152         }
1153
1154         /* Now register that disk. Same comment about failure handling */
1155         i = floppy_count++;
1156         disk = disks[i] = alloc_disk(1);
1157         if (disk == NULL)
1158                 return 0;
1159
1160         disk->major = FLOPPY_MAJOR;
1161         disk->first_minor = i;
1162         disk->fops = &floppy_fops;
1163         disk->private_data = &floppy_states[i];
1164         disk->queue = swim3_queue;
1165         disk->flags |= GENHD_FL_REMOVABLE;
1166         sprintf(disk->disk_name, "fd%d", i);
1167         set_capacity(disk, 2880);
1168         add_disk(disk);
1169
1170         return 0;
1171 }
1172
1173 static struct of_device_id swim3_match[] =
1174 {
1175         {
1176         .name           = "swim3",
1177         },
1178         {
1179         .compatible     = "ohare-swim3"
1180         },
1181         {
1182         .compatible     = "swim3"
1183         },
1184 };
1185
1186 static struct macio_driver swim3_driver =
1187 {
1188         .driver = {
1189                 .name           = "swim3",
1190                 .of_match_table = swim3_match,
1191         },
1192         .probe          = swim3_attach,
1193 #if 0
1194         .suspend        = swim3_suspend,
1195         .resume         = swim3_resume,
1196 #endif
1197 };
1198
1199
1200 int swim3_init(void)
1201 {
1202         macio_register_driver(&swim3_driver);
1203         return 0;
1204 }
1205
1206 module_init(swim3_init)
1207
1208 MODULE_LICENSE("GPL");
1209 MODULE_AUTHOR("Paul Mackerras");
1210 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);