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/mutex.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 DEFINE_MUTEX(swim3_mutex);
  40 static struct request_queue *swim3_queue;
  41 static struct gendisk *disks[2];
  42 static struct request *fd_req;
  43
  44 #define MAX_FLOPPIES    2
  45
  46 enum swim_state {
  47         idle,
  48         locating,
  49         seeking,
  50         settling,
  51         do_transfer,
  52         jogging,
  53         available,
  54         revalidating,
  55         ejecting
  56 };
  57
  58 #define REG(x)  unsigned char x; char x ## _pad[15];
  59
  60 /*
  61  * The names for these registers mostly represent speculation on my part.
  62  * It will be interesting to see how close they are to the names Apple uses.
  63  */
  64 struct swim3 {
  65         REG(data);
  66         REG(timer);             /* counts down at 1MHz */
  67         REG(error);
  68         REG(mode);
  69         REG(select);            /* controls CA0, CA1, CA2 and LSTRB signals */
  70         REG(setup);
  71         REG(control);           /* writing bits clears them */
  72         REG(status);            /* writing bits sets them in control */
  73         REG(intr);
  74         REG(nseek);             /* # tracks to seek */
  75         REG(ctrack);            /* current track number */
  76         REG(csect);             /* current sector number */
  77         REG(gap3);              /* size of gap 3 in track format */
  78         REG(sector);            /* sector # to read or write */
  79         REG(nsect);             /* # sectors to read or write */
  80         REG(intr_enable);
  81 };
  82
  83 #define control_bic     control
  84 #define control_bis     status
  85
  86 /* Bits in select register */
  87 #define CA_MASK         7
  88 #define LSTRB           8
  89
  90 /* Bits in control register */
  91 #define DO_SEEK         0x80
  92 #define FORMAT          0x40
  93 #define SELECT          0x20
  94 #define WRITE_SECTORS   0x10
  95 #define DO_ACTION       0x08
  96 #define DRIVE2_ENABLE   0x04
  97 #define DRIVE_ENABLE    0x02
  98 #define INTR_ENABLE     0x01
  99
 100 /* Bits in status register */
 101 #define FIFO_1BYTE      0x80
 102 #define FIFO_2BYTE      0x40
 103 #define ERROR           0x20
 104 #define DATA            0x08
 105 #define RDDATA          0x04
 106 #define INTR_PENDING    0x02
 107 #define MARK_BYTE       0x01
 108
 109 /* Bits in intr and intr_enable registers */
 110 #define ERROR_INTR      0x20
 111 #define DATA_CHANGED    0x10
 112 #define TRANSFER_DONE   0x08
 113 #define SEEN_SECTOR     0x04
 114 #define SEEK_DONE       0x02
 115 #define TIMER_DONE      0x01
 116
 117 /* Bits in error register */
 118 #define ERR_DATA_CRC    0x80
 119 #define ERR_ADDR_CRC    0x40
 120 #define ERR_OVERRUN     0x04
 121 #define ERR_UNDERRUN    0x01
 122
 123 /* Bits in setup register */
 124 #define S_SW_RESET      0x80
 125 #define S_GCR_WRITE     0x40
 126 #define S_IBM_DRIVE     0x20
 127 #define S_TEST_MODE     0x10
 128 #define S_FCLK_DIV2     0x08
 129 #define S_GCR           0x04
 130 #define S_COPY_PROT     0x02
 131 #define S_INV_WDATA     0x01
 132
 133 /* Select values for swim3_action */
 134 #define SEEK_POSITIVE   0
 135 #define SEEK_NEGATIVE   4
 136 #define STEP            1
 137 #define MOTOR_ON        2
 138 #define MOTOR_OFF       6
 139 #define INDEX           3
 140 #define EJECT           7
 141 #define SETMFM          9
 142 #define SETGCR          13
 143
 144 /* Select values for swim3_select and swim3_readbit */
 145 #define STEP_DIR        0
 146 #define STEPPING        1
 147 #define MOTOR_ON        2
 148 #define RELAX           3       /* also eject in progress */
 149 #define READ_DATA_0     4
 150 #define TWOMEG_DRIVE    5
 151 #define SINGLE_SIDED    6       /* drive or diskette is 4MB type? */
 152 #define DRIVE_PRESENT   7
 153 #define DISK_IN         8
 154 #define WRITE_PROT      9
 155 #define TRACK_ZERO      10
 156 #define TACHO           11
 157 #define READ_DATA_1     12
 158 #define MFM_MODE        13
 159 #define SEEK_COMPLETE   14
 160 #define ONEMEG_MEDIA    15
 161
 162 /* Definitions of values used in writing and formatting */
 163 #define DATA_ESCAPE     0x99
 164 #define GCR_SYNC_EXC    0x3f
 165 #define GCR_SYNC_CONV   0x80
 166 #define GCR_FIRST_MARK  0xd5
 167 #define GCR_SECOND_MARK 0xaa
 168 #define GCR_ADDR_MARK   "\xd5\xaa\x00"
 169 #define GCR_DATA_MARK   "\xd5\xaa\x0b"
 170 #define GCR_SLIP_BYTE   "\x27\xaa"
 171 #define GCR_SELF_SYNC   "\x3f\xbf\x1e\x34\x3c\x3f"
 172
 173 #define DATA_99         "\x99\x99"
 174 #define MFM_ADDR_MARK   "\x99\xa1\x99\xa1\x99\xa1\x99\xfe"
 175 #define MFM_INDEX_MARK  "\x99\xc2\x99\xc2\x99\xc2\x99\xfc"
 176 #define MFM_GAP_LEN     12
 177
 178 struct floppy_state {
 179         enum swim_state state;
 180         spinlock_t lock;
 181         struct swim3 __iomem *swim3;    /* hardware registers */
 182         struct dbdma_regs __iomem *dma; /* DMA controller registers */
 183         int     swim3_intr;     /* interrupt number for SWIM3 */
 184         int     dma_intr;       /* interrupt number for DMA channel */
 185         int     cur_cyl;        /* cylinder head is on, or -1 */
 186         int     cur_sector;     /* last sector we saw go past */
 187         int     req_cyl;        /* the cylinder for the current r/w request */
 188         int     head;           /* head number ditto */
 189         int     req_sector;     /* sector number ditto */
 190         int     scount;         /* # sectors we're transferring at present */
 191         int     retries;
 192         int     settle_time;
 193         int     secpercyl;      /* disk geometry information */
 194         int     secpertrack;
 195         int     total_secs;
 196         int     write_prot;     /* 1 if write-protected, 0 if not, -1 dunno */
 197         struct dbdma_cmd *dma_cmd;
 198         int     ref_count;
 199         int     expect_cyl;
 200         struct timer_list timeout;
 201         int     timeout_pending;
 202         int     ejected;
 203         wait_queue_head_t wait;
 204         int     wanted;
 205         struct macio_dev *mdev;
 206         char    dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
 207 };
 208
 209 static struct floppy_state floppy_states[MAX_FLOPPIES];
 210 static int floppy_count = 0;
 211 static DEFINE_SPINLOCK(swim3_lock);
 212
 213 static unsigned short write_preamble[] = {
 214         0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */
 215         0, 0, 0, 0, 0, 0,                       /* sync field */
 216         0x99a1, 0x99a1, 0x99a1, 0x99fb,         /* data address mark */
 217         0x990f                                  /* no escape for 512 bytes */
 218 };
 219
 220 static unsigned short write_postamble[] = {
 221         0x9904,                                 /* insert CRC */
 222         0x4e4e, 0x4e4e,
 223         0x9908,                                 /* stop writing */
 224         0, 0, 0, 0, 0, 0
 225 };
 226
 227 static void swim3_select(struct floppy_state *fs, int sel);
 228 static void swim3_action(struct floppy_state *fs, int action);
 229 static int swim3_readbit(struct floppy_state *fs, int bit);
 230 static void do_fd_request(struct request_queue * q);
 231 static void start_request(struct floppy_state *fs);
 232 static void set_timeout(struct floppy_state *fs, int nticks,
 233                         void (*proc)(unsigned long));
 234 static void scan_track(struct floppy_state *fs);
 235 static void seek_track(struct floppy_state *fs, int n);
 236 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count);
 237 static void setup_transfer(struct floppy_state *fs);
 238 static void act(struct floppy_state *fs);
 239 static void scan_timeout(unsigned long data);
 240 static void seek_timeout(unsigned long data);
 241 static void settle_timeout(unsigned long data);
 242 static void xfer_timeout(unsigned long data);
 243 static irqreturn_t swim3_interrupt(int irq, void *dev_id);
 244 /*static void fd_dma_interrupt(int irq, void *dev_id);*/
 245 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 246                       int interruptible);
 247 static void release_drive(struct floppy_state *fs);
 248 static int fd_eject(struct floppy_state *fs);
 249 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
 250                         unsigned int cmd, unsigned long param);
 251 static int floppy_open(struct block_device *bdev, fmode_t mode);
 252 static int floppy_release(struct gendisk *disk, fmode_t mode);
 253 static unsigned int floppy_check_events(struct gendisk *disk,
 254                                         unsigned int clearing);
 255 static int floppy_revalidate(struct gendisk *disk);
 256
 257 static bool swim3_end_request(int err, unsigned int nr_bytes)
 258 {
 259         if (__blk_end_request(fd_req, err, nr_bytes))
 260                 return true;
 261
 262         fd_req = NULL;
 263         return false;
 264 }
 265
 266 static bool swim3_end_request_cur(int err)
 267 {
 268         return swim3_end_request(err, blk_rq_cur_bytes(fd_req));
 269 }
 270
 271 static void swim3_select(struct floppy_state *fs, int sel)
 272 {
 273         struct swim3 __iomem *sw = fs->swim3;
 274
 275         out_8(&sw->select, RELAX);
 276         if (sel & 8)
 277                 out_8(&sw->control_bis, SELECT);
 278         else
 279                 out_8(&sw->control_bic, SELECT);
 280         out_8(&sw->select, sel & CA_MASK);
 281 }
 282
 283 static void swim3_action(struct floppy_state *fs, int action)
 284 {
 285         struct swim3 __iomem *sw = fs->swim3;
 286
 287         swim3_select(fs, action);
 288         udelay(1);
 289         out_8(&sw->select, sw->select | LSTRB);
 290         udelay(2);
 291         out_8(&sw->select, sw->select & ~LSTRB);
 292         udelay(1);
 293 }
 294
 295 static int swim3_readbit(struct floppy_state *fs, int bit)
 296 {
 297         struct swim3 __iomem *sw = fs->swim3;
 298         int stat;
 299
 300         swim3_select(fs, bit);
 301         udelay(1);
 302         stat = in_8(&sw->status);
 303         return (stat & DATA) == 0;
 304 }
 305
 306 static void do_fd_request(struct request_queue * q)
 307 {
 308         int i;
 309
 310         for(i=0; i<floppy_count; i++) {
 311                 struct floppy_state *fs = &floppy_states[i];
 312                 if (fs->mdev->media_bay &&
 313                     check_media_bay(fs->mdev->media_bay) != MB_FD)
 314                         continue;
 315                 start_request(fs);
 316         }
 317 }
 318
 319 static void start_request(struct floppy_state *fs)
 320 {
 321         struct request *req;
 322         unsigned long x;
 323
 324         if (fs->state == idle && fs->wanted) {
 325                 fs->state = available;
 326                 wake_up(&fs->wait);
 327                 return;
 328         }
 329         while (fs->state == idle) {
 330                 if (!fd_req) {
 331                         fd_req = blk_fetch_request(swim3_queue);
 332                         if (!fd_req)
 333                                 break;
 334                 }
 335                 req = fd_req;
 336 #if 0
 337                 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n",
 338                        req->rq_disk->disk_name, req->cmd,
 339                        (long)blk_rq_pos(req), blk_rq_sectors(req), req->buffer);
 340                 printk("           errors=%d current_nr_sectors=%u\n",
 341                        req->errors, blk_rq_cur_sectors(req));
 342 #endif
 343
 344                 if (blk_rq_pos(req) >= fs->total_secs) {
 345                         swim3_end_request_cur(-EIO);
 346                         continue;
 347                 }
 348                 if (fs->ejected) {
 349                         swim3_end_request_cur(-EIO);
 350                         continue;
 351                 }
 352
 353                 if (rq_data_dir(req) == WRITE) {
 354                         if (fs->write_prot < 0)
 355                                 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 356                         if (fs->write_prot) {
 357                                 swim3_end_request_cur(-EIO);
 358                                 continue;
 359                         }
 360                 }
 361
 362                 /* Do not remove the cast. blk_rq_pos(req) is now a
 363                  * sector_t and can be 64 bits, but it will never go
 364                  * past 32 bits for this driver anyway, so we can
 365                  * safely cast it down and not have to do a 64/32
 366                  * division
 367                  */
 368                 fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl;
 369                 x = ((long)blk_rq_pos(req)) % fs->secpercyl;
 370                 fs->head = x / fs->secpertrack;
 371                 fs->req_sector = x % fs->secpertrack + 1;
 372                 fd_req = req;
 373                 fs->state = do_transfer;
 374                 fs->retries = 0;
 375
 376                 act(fs);
 377         }
 378 }
 379
 380 static void set_timeout(struct floppy_state *fs, int nticks,
 381                         void (*proc)(unsigned long))
 382 {
 383         unsigned long flags;
 384
 385         spin_lock_irqsave(&fs->lock, flags);
 386         if (fs->timeout_pending)
 387                 del_timer(&fs->timeout);
 388         fs->timeout.expires = jiffies + nticks;
 389         fs->timeout.function = proc;
 390         fs->timeout.data = (unsigned long) fs;
 391         add_timer(&fs->timeout);
 392         fs->timeout_pending = 1;
 393         spin_unlock_irqrestore(&fs->lock, flags);
 394 }
 395
 396 static inline void scan_track(struct floppy_state *fs)
 397 {
 398         struct swim3 __iomem *sw = fs->swim3;
 399
 400         swim3_select(fs, READ_DATA_0);
 401         in_8(&sw->intr);                /* clear SEEN_SECTOR bit */
 402         in_8(&sw->error);
 403         out_8(&sw->intr_enable, SEEN_SECTOR);
 404         out_8(&sw->control_bis, DO_ACTION);
 405         /* enable intr when track found */
 406         set_timeout(fs, HZ, scan_timeout);      /* enable timeout */
 407 }
 408
 409 static inline void seek_track(struct floppy_state *fs, int n)
 410 {
 411         struct swim3 __iomem *sw = fs->swim3;
 412
 413         if (n >= 0) {
 414                 swim3_action(fs, SEEK_POSITIVE);
 415                 sw->nseek = n;
 416         } else {
 417                 swim3_action(fs, SEEK_NEGATIVE);
 418                 sw->nseek = -n;
 419         }
 420         fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
 421         swim3_select(fs, STEP);
 422         in_8(&sw->error);
 423         /* enable intr when seek finished */
 424         out_8(&sw->intr_enable, SEEK_DONE);
 425         out_8(&sw->control_bis, DO_SEEK);
 426         set_timeout(fs, 3*HZ, seek_timeout);    /* enable timeout */
 427         fs->settle_time = 0;
 428 }
 429
 430 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
 431                             void *buf, int count)
 432 {
 433         st_le16(&cp->req_count, count);
 434         st_le16(&cp->command, cmd);
 435         st_le32(&cp->phy_addr, virt_to_bus(buf));
 436         cp->xfer_status = 0;
 437 }
 438
 439 static inline void setup_transfer(struct floppy_state *fs)
 440 {
 441         int n;
 442         struct swim3 __iomem *sw = fs->swim3;
 443         struct dbdma_cmd *cp = fs->dma_cmd;
 444         struct dbdma_regs __iomem *dr = fs->dma;
 445
 446         if (blk_rq_cur_sectors(fd_req) <= 0) {
 447                 printk(KERN_ERR "swim3: transfer 0 sectors?\n");
 448                 return;
 449         }
 450         if (rq_data_dir(fd_req) == WRITE)
 451                 n = 1;
 452         else {
 453                 n = fs->secpertrack - fs->req_sector + 1;
 454                 if (n > blk_rq_cur_sectors(fd_req))
 455                         n = blk_rq_cur_sectors(fd_req);
 456         }
 457         fs->scount = n;
 458         swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
 459         out_8(&sw->sector, fs->req_sector);
 460         out_8(&sw->nsect, n);
 461         out_8(&sw->gap3, 0);
 462         out_le32(&dr->cmdptr, virt_to_bus(cp));
 463         if (rq_data_dir(fd_req) == WRITE) {
 464                 /* Set up 3 dma commands: write preamble, data, postamble */
 465                 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
 466                 ++cp;
 467                 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512);
 468                 ++cp;
 469                 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
 470         } else {
 471                 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512);
 472         }
 473         ++cp;
 474         out_le16(&cp->command, DBDMA_STOP);
 475         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 476         in_8(&sw->error);
 477         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 478         if (rq_data_dir(fd_req) == WRITE)
 479                 out_8(&sw->control_bis, WRITE_SECTORS);
 480         in_8(&sw->intr);
 481         out_le32(&dr->control, (RUN << 16) | RUN);
 482         /* enable intr when transfer complete */
 483         out_8(&sw->intr_enable, TRANSFER_DONE);
 484         out_8(&sw->control_bis, DO_ACTION);
 485         set_timeout(fs, 2*HZ, xfer_timeout);    /* enable timeout */
 486 }
 487
 488 static void act(struct floppy_state *fs)
 489 {
 490         for (;;) {
 491                 switch (fs->state) {
 492                 case idle:
 493                         return;         /* XXX shouldn't get here */
 494
 495                 case locating:
 496                         if (swim3_readbit(fs, TRACK_ZERO)) {
 497                                 fs->cur_cyl = 0;
 498                                 if (fs->req_cyl == 0)
 499                                         fs->state = do_transfer;
 500                                 else
 501                                         fs->state = seeking;
 502                                 break;
 503                         }
 504                         scan_track(fs);
 505                         return;
 506
 507                 case seeking:
 508                         if (fs->cur_cyl < 0) {
 509                                 fs->expect_cyl = -1;
 510                                 fs->state = locating;
 511                                 break;
 512                         }
 513                         if (fs->req_cyl == fs->cur_cyl) {
 514                                 printk("whoops, seeking 0\n");
 515                                 fs->state = do_transfer;
 516                                 break;
 517                         }
 518                         seek_track(fs, fs->req_cyl - fs->cur_cyl);
 519                         return;
 520
 521                 case settling:
 522                         /* check for SEEK_COMPLETE after 30ms */
 523                         fs->settle_time = (HZ + 32) / 33;
 524                         set_timeout(fs, fs->settle_time, settle_timeout);
 525                         return;
 526
 527                 case do_transfer:
 528                         if (fs->cur_cyl != fs->req_cyl) {
 529                                 if (fs->retries > 5) {
 530                                         swim3_end_request_cur(-EIO);
 531                                         fs->state = idle;
 532                                         return;
 533                                 }
 534                                 fs->state = seeking;
 535                                 break;
 536                         }
 537                         setup_transfer(fs);
 538                         return;
 539
 540                 case jogging:
 541                         seek_track(fs, -5);
 542                         return;
 543
 544                 default:
 545                         printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
 546                         return;
 547                 }
 548         }
 549 }
 550
 551 static void scan_timeout(unsigned long data)
 552 {
 553         struct floppy_state *fs = (struct floppy_state *) data;
 554         struct swim3 __iomem *sw = fs->swim3;
 555
 556         fs->timeout_pending = 0;
 557         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 558         out_8(&sw->select, RELAX);
 559         out_8(&sw->intr_enable, 0);
 560         fs->cur_cyl = -1;
 561         if (fs->retries > 5) {
 562                 swim3_end_request_cur(-EIO);
 563                 fs->state = idle;
 564                 start_request(fs);
 565         } else {
 566                 fs->state = jogging;
 567                 act(fs);
 568         }
 569 }
 570
 571 static void seek_timeout(unsigned long data)
 572 {
 573         struct floppy_state *fs = (struct floppy_state *) data;
 574         struct swim3 __iomem *sw = fs->swim3;
 575
 576         fs->timeout_pending = 0;
 577         out_8(&sw->control_bic, DO_SEEK);
 578         out_8(&sw->select, RELAX);
 579         out_8(&sw->intr_enable, 0);
 580         printk(KERN_ERR "swim3: seek timeout\n");
 581         swim3_end_request_cur(-EIO);
 582         fs->state = idle;
 583         start_request(fs);
 584 }
 585
 586 static void settle_timeout(unsigned long data)
 587 {
 588         struct floppy_state *fs = (struct floppy_state *) data;
 589         struct swim3 __iomem *sw = fs->swim3;
 590
 591         fs->timeout_pending = 0;
 592         if (swim3_readbit(fs, SEEK_COMPLETE)) {
 593                 out_8(&sw->select, RELAX);
 594                 fs->state = locating;
 595                 act(fs);
 596                 return;
 597         }
 598         out_8(&sw->select, RELAX);
 599         if (fs->settle_time < 2*HZ) {
 600                 ++fs->settle_time;
 601                 set_timeout(fs, 1, settle_timeout);
 602                 return;
 603         }
 604         printk(KERN_ERR "swim3: seek settle timeout\n");
 605         swim3_end_request_cur(-EIO);
 606         fs->state = idle;
 607         start_request(fs);
 608 }
 609
 610 static void xfer_timeout(unsigned long data)
 611 {
 612         struct floppy_state *fs = (struct floppy_state *) data;
 613         struct swim3 __iomem *sw = fs->swim3;
 614         struct dbdma_regs __iomem *dr = fs->dma;
 615         int n;
 616
 617         fs->timeout_pending = 0;
 618         out_le32(&dr->control, RUN << 16);
 619         /* We must wait a bit for dbdma to stop */
 620         for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
 621                 udelay(1);
 622         out_8(&sw->intr_enable, 0);
 623         out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 624         out_8(&sw->select, RELAX);
 625         printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
 626                (rq_data_dir(fd_req)==WRITE? "writ": "read"),
 627                (long)blk_rq_pos(fd_req));
 628         swim3_end_request_cur(-EIO);
 629         fs->state = idle;
 630         start_request(fs);
 631 }
 632
 633 static irqreturn_t swim3_interrupt(int irq, void *dev_id)
 634 {
 635         struct floppy_state *fs = (struct floppy_state *) dev_id;
 636         struct swim3 __iomem *sw = fs->swim3;
 637         int intr, err, n;
 638         int stat, resid;
 639         struct dbdma_regs __iomem *dr;
 640         struct dbdma_cmd *cp;
 641
 642         intr = in_8(&sw->intr);
 643         err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
 644         if ((intr & ERROR_INTR) && fs->state != do_transfer)
 645                 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%x, intr=%x, err=%x\n",
 646                        fs->state, rq_data_dir(fd_req), intr, err);
 647         switch (fs->state) {
 648         case locating:
 649                 if (intr & SEEN_SECTOR) {
 650                         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 651                         out_8(&sw->select, RELAX);
 652                         out_8(&sw->intr_enable, 0);
 653                         del_timer(&fs->timeout);
 654                         fs->timeout_pending = 0;
 655                         if (sw->ctrack == 0xff) {
 656                                 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
 657                                 fs->cur_cyl = -1;
 658                                 if (fs->retries > 5) {
 659                                         swim3_end_request_cur(-EIO);
 660                                         fs->state = idle;
 661                                         start_request(fs);
 662                                 } else {
 663                                         fs->state = jogging;
 664                                         act(fs);
 665                                 }
 666                                 break;
 667                         }
 668                         fs->cur_cyl = sw->ctrack;
 669                         fs->cur_sector = sw->csect;
 670                         if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
 671                                 printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
 672                                        fs->expect_cyl, fs->cur_cyl);
 673                         fs->state = do_transfer;
 674                         act(fs);
 675                 }
 676                 break;
 677         case seeking:
 678         case jogging:
 679                 if (sw->nseek == 0) {
 680                         out_8(&sw->control_bic, DO_SEEK);
 681                         out_8(&sw->select, RELAX);
 682                         out_8(&sw->intr_enable, 0);
 683                         del_timer(&fs->timeout);
 684                         fs->timeout_pending = 0;
 685                         if (fs->state == seeking)
 686                                 ++fs->retries;
 687                         fs->state = settling;
 688                         act(fs);
 689                 }
 690                 break;
 691         case settling:
 692                 out_8(&sw->intr_enable, 0);
 693                 del_timer(&fs->timeout);
 694                 fs->timeout_pending = 0;
 695                 act(fs);
 696                 break;
 697         case do_transfer:
 698                 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
 699                         break;
 700                 out_8(&sw->intr_enable, 0);
 701                 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 702                 out_8(&sw->select, RELAX);
 703                 del_timer(&fs->timeout);
 704                 fs->timeout_pending = 0;
 705                 dr = fs->dma;
 706                 cp = fs->dma_cmd;
 707                 if (rq_data_dir(fd_req) == WRITE)
 708                         ++cp;
 709                 /*
 710                  * Check that the main data transfer has finished.
 711                  * On writing, the swim3 sometimes doesn't use
 712                  * up all the bytes of the postamble, so we can still
 713                  * see DMA active here.  That doesn't matter as long
 714                  * as all the sector data has been transferred.
 715                  */
 716                 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
 717                         /* wait a little while for DMA to complete */
 718                         for (n = 0; n < 100; ++n) {
 719                                 if (cp->xfer_status != 0)
 720                                         break;
 721                                 udelay(1);
 722                                 barrier();
 723                         }
 724                 }
 725                 /* turn off DMA */
 726                 out_le32(&dr->control, (RUN | PAUSE) << 16);
 727                 stat = ld_le16(&cp->xfer_status);
 728                 resid = ld_le16(&cp->res_count);
 729                 if (intr & ERROR_INTR) {
 730                         n = fs->scount - 1 - resid / 512;
 731                         if (n > 0) {
 732                                 blk_update_request(fd_req, 0, n << 9);
 733                                 fs->req_sector += n;
 734                         }
 735                         if (fs->retries < 5) {
 736                                 ++fs->retries;
 737                                 act(fs);
 738                         } else {
 739                                 printk("swim3: error %sing block %ld (err=%x)\n",
 740                                        rq_data_dir(fd_req) == WRITE? "writ": "read",
 741                                        (long)blk_rq_pos(fd_req), err);
 742                                 swim3_end_request_cur(-EIO);
 743                                 fs->state = idle;
 744                         }
 745                 } else {
 746                         if ((stat & ACTIVE) == 0 || resid != 0) {
 747                                 /* musta been an error */
 748                                 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
 749                                 printk(KERN_ERR "  state=%d, dir=%x, intr=%x, err=%x\n",
 750                                        fs->state, rq_data_dir(fd_req), intr, err);
 751                                 swim3_end_request_cur(-EIO);
 752                                 fs->state = idle;
 753                                 start_request(fs);
 754                                 break;
 755                         }
 756                         if (swim3_end_request(0, fs->scount << 9)) {
 757                                 fs->req_sector += fs->scount;
 758                                 if (fs->req_sector > fs->secpertrack) {
 759                                         fs->req_sector -= fs->secpertrack;
 760                                         if (++fs->head > 1) {
 761                                                 fs->head = 0;
 762                                                 ++fs->req_cyl;
 763                                         }
 764                                 }
 765                                 act(fs);
 766                         } else
 767                                 fs->state = idle;
 768                 }
 769                 if (fs->state == idle)
 770                         start_request(fs);
 771                 break;
 772         default:
 773                 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);
 774         }
 775         return IRQ_HANDLED;
 776 }
 777
 778 /*
 779 static void fd_dma_interrupt(int irq, void *dev_id)
 780 {
 781 }
 782 */
 783
 784 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 785                       int interruptible)
 786 {
 787         unsigned long flags;
 788
 789         spin_lock_irqsave(&fs->lock, flags);
 790         if (fs->state != idle) {
 791                 ++fs->wanted;
 792                 while (fs->state != available) {
 793                         if (interruptible && signal_pending(current)) {
 794                                 --fs->wanted;
 795                                 spin_unlock_irqrestore(&fs->lock, flags);
 796                                 return -EINTR;
 797                         }
 798                         interruptible_sleep_on(&fs->wait);
 799                 }
 800                 --fs->wanted;
 801         }
 802         fs->state = state;
 803         spin_unlock_irqrestore(&fs->lock, flags);
 804         return 0;
 805 }
 806
 807 static void release_drive(struct floppy_state *fs)
 808 {
 809         unsigned long flags;
 810
 811         spin_lock_irqsave(&fs->lock, flags);
 812         fs->state = idle;
 813         start_request(fs);
 814         spin_unlock_irqrestore(&fs->lock, flags);
 815 }
 816
 817 static int fd_eject(struct floppy_state *fs)
 818 {
 819         int err, n;
 820
 821         err = grab_drive(fs, ejecting, 1);
 822         if (err)
 823                 return err;
 824         swim3_action(fs, EJECT);
 825         for (n = 20; n > 0; --n) {
 826                 if (signal_pending(current)) {
 827                         err = -EINTR;
 828                         break;
 829                 }
 830                 swim3_select(fs, RELAX);
 831                 schedule_timeout_interruptible(1);
 832                 if (swim3_readbit(fs, DISK_IN) == 0)
 833                         break;
 834         }
 835         swim3_select(fs, RELAX);
 836         udelay(150);
 837         fs->ejected = 1;
 838         release_drive(fs);
 839         return err;
 840 }
 841
 842 static struct floppy_struct floppy_type =
 843         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL };    /*  7 1.44MB 3.5"   */
 844
 845 static int floppy_locked_ioctl(struct block_device *bdev, fmode_t mode,
 846                         unsigned int cmd, unsigned long param)
 847 {
 848         struct floppy_state *fs = bdev->bd_disk->private_data;
 849         int err;
 850
 851         if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
 852                 return -EPERM;
 853
 854         if (fs->mdev->media_bay &&
 855             check_media_bay(fs->mdev->media_bay) != MB_FD)
 856                 return -ENXIO;
 857
 858         switch (cmd) {
 859         case FDEJECT:
 860                 if (fs->ref_count != 1)
 861                         return -EBUSY;
 862                 err = fd_eject(fs);
 863                 return err;
 864         case FDGETPRM:
 865                 if (copy_to_user((void __user *) param, &floppy_type,
 866                                  sizeof(struct floppy_struct)))
 867                         return -EFAULT;
 868                 return 0;
 869         }
 870         return -ENOTTY;
 871 }
 872
 873 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
 874                                  unsigned int cmd, unsigned long param)
 875 {
 876         int ret;
 877
 878         mutex_lock(&swim3_mutex);
 879         ret = floppy_locked_ioctl(bdev, mode, cmd, param);
 880         mutex_unlock(&swim3_mutex);
 881
 882         return ret;
 883 }
 884
 885 static int floppy_open(struct block_device *bdev, fmode_t mode)
 886 {
 887         struct floppy_state *fs = bdev->bd_disk->private_data;
 888         struct swim3 __iomem *sw = fs->swim3;
 889         int n, err = 0;
 890
 891         if (fs->ref_count == 0) {
 892                 if (fs->mdev->media_bay &&
 893                     check_media_bay(fs->mdev->media_bay) != MB_FD)
 894                         return -ENXIO;
 895                 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
 896                 out_8(&sw->control_bic, 0xff);
 897                 out_8(&sw->mode, 0x95);
 898                 udelay(10);
 899                 out_8(&sw->intr_enable, 0);
 900                 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
 901                 swim3_action(fs, MOTOR_ON);
 902                 fs->write_prot = -1;
 903                 fs->cur_cyl = -1;
 904                 for (n = 0; n < 2 * HZ; ++n) {
 905                         if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
 906                                 break;
 907                         if (signal_pending(current)) {
 908                                 err = -EINTR;
 909                                 break;
 910                         }
 911                         swim3_select(fs, RELAX);
 912                         schedule_timeout_interruptible(1);
 913                 }
 914                 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
 915                                  || swim3_readbit(fs, DISK_IN) == 0))
 916                         err = -ENXIO;
 917                 swim3_action(fs, SETMFM);
 918                 swim3_select(fs, RELAX);
 919
 920         } else if (fs->ref_count == -1 || mode & FMODE_EXCL)
 921                 return -EBUSY;
 922
 923         if (err == 0 && (mode & FMODE_NDELAY) == 0
 924             && (mode & (FMODE_READ|FMODE_WRITE))) {
 925                 check_disk_change(bdev);
 926                 if (fs->ejected)
 927                         err = -ENXIO;
 928         }
 929
 930         if (err == 0 && (mode & FMODE_WRITE)) {
 931                 if (fs->write_prot < 0)
 932                         fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 933                 if (fs->write_prot)
 934                         err = -EROFS;
 935         }
 936
 937         if (err) {
 938                 if (fs->ref_count == 0) {
 939                         swim3_action(fs, MOTOR_OFF);
 940                         out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
 941                         swim3_select(fs, RELAX);
 942                 }
 943                 return err;
 944         }
 945
 946         if (mode & FMODE_EXCL)
 947                 fs->ref_count = -1;
 948         else
 949                 ++fs->ref_count;
 950
 951         return 0;
 952 }
 953
 954 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
 955 {
 956         int ret;
 957
 958         mutex_lock(&swim3_mutex);
 959         ret = floppy_open(bdev, mode);
 960         mutex_unlock(&swim3_mutex);
 961
 962         return ret;
 963 }
 964
 965 static int floppy_release(struct gendisk *disk, fmode_t mode)
 966 {
 967         struct floppy_state *fs = disk->private_data;
 968         struct swim3 __iomem *sw = fs->swim3;
 969         mutex_lock(&swim3_mutex);
 970         if (fs->ref_count > 0 && --fs->ref_count == 0) {
 971                 swim3_action(fs, MOTOR_OFF);
 972                 out_8(&sw->control_bic, 0xff);
 973                 swim3_select(fs, RELAX);
 974         }
 975         mutex_unlock(&swim3_mutex);
 976         return 0;
 977 }
 978
 979 static unsigned int floppy_check_events(struct gendisk *disk,
 980                                         unsigned int clearing)
 981 {
 982         struct floppy_state *fs = disk->private_data;
 983         return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0;
 984 }
 985
 986 static int floppy_revalidate(struct gendisk *disk)
 987 {
 988         struct floppy_state *fs = disk->private_data;
 989         struct swim3 __iomem *sw;
 990         int ret, n;
 991
 992         if (fs->mdev->media_bay &&
 993             check_media_bay(fs->mdev->media_bay) != MB_FD)
 994                 return -ENXIO;
 995
 996         sw = fs->swim3;
 997         grab_drive(fs, revalidating, 0);
 998         out_8(&sw->intr_enable, 0);
 999         out_8(&sw->control_bis, DRIVE_ENABLE);
1000         swim3_action(fs, MOTOR_ON);     /* necessary? */
1001         fs->write_prot = -1;
1002         fs->cur_cyl = -1;
1003         mdelay(1);
1004         for (n = HZ; n > 0; --n) {
1005                 if (swim3_readbit(fs, SEEK_COMPLETE))
1006                         break;
1007                 if (signal_pending(current))
1008                         break;
1009                 swim3_select(fs, RELAX);
1010                 schedule_timeout_interruptible(1);
1011         }
1012         ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
1013                 || swim3_readbit(fs, DISK_IN) == 0;
1014         if (ret)
1015                 swim3_action(fs, MOTOR_OFF);
1016         else {
1017                 fs->ejected = 0;
1018                 swim3_action(fs, SETMFM);
1019         }
1020         swim3_select(fs, RELAX);
1021
1022         release_drive(fs);
1023         return ret;
1024 }
1025
1026 static const struct block_device_operations floppy_fops = {
1027         .open           = floppy_unlocked_open,
1028         .release        = floppy_release,
1029         .ioctl          = floppy_ioctl,
1030         .check_events   = floppy_check_events,
1031         .revalidate_disk= floppy_revalidate,
1032 };
1033
1034 static int swim3_add_device(struct macio_dev *mdev, int index)
1035 {
1036         struct device_node *swim = mdev->ofdev.dev.of_node;
1037         struct floppy_state *fs = &floppy_states[index];
1038         int rc = -EBUSY;
1039
1040         /* Check & Request resources */
1041         if (macio_resource_count(mdev) < 2) {
1042                 printk(KERN_WARNING "ifd%d: no address for %s\n",
1043                        index, swim->full_name);
1044                 return -ENXIO;
1045         }
1046         if (macio_irq_count(mdev) < 2) {
1047                 printk(KERN_WARNING "fd%d: no intrs for device %s\n",
1048                         index, swim->full_name);
1049         }
1050         if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
1051                 printk(KERN_ERR "fd%d: can't request mmio resource for %s\n",
1052                        index, swim->full_name);
1053                 return -EBUSY;
1054         }
1055         if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
1056                 printk(KERN_ERR "fd%d: can't request dma resource for %s\n",
1057                        index, swim->full_name);
1058                 macio_release_resource(mdev, 0);
1059                 return -EBUSY;
1060         }
1061         dev_set_drvdata(&mdev->ofdev.dev, fs);
1062
1063         if (mdev->media_bay == NULL)
1064                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1065
1066         memset(fs, 0, sizeof(*fs));
1067         spin_lock_init(&fs->lock);
1068         fs->state = idle;
1069         fs->swim3 = (struct swim3 __iomem *)
1070                 ioremap(macio_resource_start(mdev, 0), 0x200);
1071         if (fs->swim3 == NULL) {
1072                 printk("fd%d: couldn't map registers for %s\n",
1073                        index, swim->full_name);
1074                 rc = -ENOMEM;
1075                 goto out_release;
1076         }
1077         fs->dma = (struct dbdma_regs __iomem *)
1078                 ioremap(macio_resource_start(mdev, 1), 0x200);
1079         if (fs->dma == NULL) {
1080                 printk("fd%d: couldn't map DMA for %s\n",
1081                        index, swim->full_name);
1082                 iounmap(fs->swim3);
1083                 rc = -ENOMEM;
1084                 goto out_release;
1085         }
1086         fs->swim3_intr = macio_irq(mdev, 0);
1087         fs->dma_intr = macio_irq(mdev, 1);
1088         fs->cur_cyl = -1;
1089         fs->cur_sector = -1;
1090         fs->secpercyl = 36;
1091         fs->secpertrack = 18;
1092         fs->total_secs = 2880;
1093         fs->mdev = mdev;
1094         init_waitqueue_head(&fs->wait);
1095
1096         fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1097         memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1098         st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1099
1100         if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1101                 printk(KERN_ERR "fd%d: couldn't request irq %d for %s\n",
1102                        index, fs->swim3_intr, swim->full_name);
1103                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1104                 goto out_unmap;
1105                 return -EBUSY;
1106         }
1107 /*
1108         if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
1109                 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
1110                        fs->dma_intr);
1111                 return -EBUSY;
1112         }
1113 */
1114
1115         init_timer(&fs->timeout);
1116
1117         printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
1118                 mdev->media_bay ? "in media bay" : "");
1119
1120         return 0;
1121
1122  out_unmap:
1123         iounmap(fs->dma);
1124         iounmap(fs->swim3);
1125
1126  out_release:
1127         macio_release_resource(mdev, 0);
1128         macio_release_resource(mdev, 1);
1129
1130         return rc;
1131 }
1132
1133 static int __devinit swim3_attach(struct macio_dev *mdev, const struct of_device_id *match)
1134 {
1135         int i, rc;
1136         struct gendisk *disk;
1137
1138         /* Add the drive */
1139         rc = swim3_add_device(mdev, floppy_count);
1140         if (rc)
1141                 return rc;
1142
1143         /* Now create the queue if not there yet */
1144         if (swim3_queue == NULL) {
1145                 /* If we failed, there isn't much we can do as the driver is still
1146                  * too dumb to remove the device, just bail out
1147                  */
1148                 if (register_blkdev(FLOPPY_MAJOR, "fd"))
1149                         return 0;
1150                 swim3_queue = blk_init_queue(do_fd_request, &swim3_lock);
1151                 if (swim3_queue == NULL) {
1152                         unregister_blkdev(FLOPPY_MAJOR, "fd");
1153                         return 0;
1154                 }
1155         }
1156
1157         /* Now register that disk. Same comment about failure handling */
1158         i = floppy_count++;
1159         disk = disks[i] = alloc_disk(1);
1160         if (disk == NULL)
1161                 return 0;
1162
1163         disk->major = FLOPPY_MAJOR;
1164         disk->first_minor = i;
1165         disk->fops = &floppy_fops;
1166         disk->private_data = &floppy_states[i];
1167         disk->queue = swim3_queue;
1168         disk->flags |= GENHD_FL_REMOVABLE;
1169         sprintf(disk->disk_name, "fd%d", i);
1170         set_capacity(disk, 2880);
1171         add_disk(disk);
1172
1173         return 0;
1174 }
1175
1176 static struct of_device_id swim3_match[] =
1177 {
1178         {
1179         .name           = "swim3",
1180         },
1181         {
1182         .compatible     = "ohare-swim3"
1183         },
1184         {
1185         .compatible     = "swim3"
1186         },
1187         { /* end of list */ }
1188 };
1189
1190 static struct macio_driver swim3_driver =
1191 {
1192         .driver = {
1193                 .name           = "swim3",
1194                 .of_match_table = swim3_match,
1195         },
1196         .probe          = swim3_attach,
1197 #if 0
1198         .suspend        = swim3_suspend,
1199         .resume         = swim3_resume,
1200 #endif
1201 };
1202
1203
1204 int swim3_init(void)
1205 {
1206         macio_register_driver(&swim3_driver);
1207         return 0;
1208 }
1209
1210 module_init(swim3_init)
1211
1212 MODULE_LICENSE("GPL");
1213 MODULE_AUTHOR("Paul Mackerras");
1214 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);