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