drivers/block/swim3.c

   1 /*
   2  * Driver for the SWIM3 (Super Woz Integrated Machine 3)
   3  * floppy controller found on Power Macintoshes.
   4  *
   5  * Copyright (C) 1996 Paul Mackerras.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version
  10  * 2 of the License, or (at your option) any later version.
  11  */
  12
  13 /*
  14  * TODO:
  15  * handle 2 drives
  16  * handle GCR disks
  17  */
  18
  19 #include <linux/stddef.h>
  20 #include <linux/kernel.h>
  21 #include <linux/sched.h>
  22 #include <linux/timer.h>
  23 #include <linux/delay.h>
  24 #include <linux/fd.h>
  25 #include <linux/ioctl.h>
  26 #include <linux/blkdev.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/module.h>
  29 #include <linux/spinlock.h>
  30 #include <asm/io.h>
  31 #include <asm/dbdma.h>
  32 #include <asm/prom.h>
  33 #include <asm/uaccess.h>
  34 #include <asm/mediabay.h>
  35 #include <asm/machdep.h>
  36 #include <asm/pmac_feature.h>
  37
  38 static struct request_queue *swim3_queue;
  39 static struct gendisk *disks[2];
  40 static struct request *fd_req;
  41
  42 #define MAX_FLOPPIES    2
  43
  44 enum swim_state {
  45         idle,
  46         locating,
  47         seeking,
  48         settling,
  49         do_transfer,
  50         jogging,
  51         available,
  52         revalidating,
  53         ejecting
  54 };
  55
  56 #define REG(x)  unsigned char x; char x ## _pad[15];
  57
  58 /*
  59  * The names for these registers mostly represent speculation on my part.
  60  * It will be interesting to see how close they are to the names Apple uses.
  61  */
  62 struct swim3 {
  63         REG(data);
  64         REG(timer);             /* counts down at 1MHz */
  65         REG(error);
  66         REG(mode);
  67         REG(select);            /* controls CA0, CA1, CA2 and LSTRB signals */
  68         REG(setup);
  69         REG(control);           /* writing bits clears them */
  70         REG(status);            /* writing bits sets them in control */
  71         REG(intr);
  72         REG(nseek);             /* # tracks to seek */
  73         REG(ctrack);            /* current track number */
  74         REG(csect);             /* current sector number */
  75         REG(gap3);              /* size of gap 3 in track format */
  76         REG(sector);            /* sector # to read or write */
  77         REG(nsect);             /* # sectors to read or write */
  78         REG(intr_enable);
  79 };
  80
  81 #define control_bic     control
  82 #define control_bis     status
  83
  84 /* Bits in select register */
  85 #define CA_MASK         7
  86 #define LSTRB           8
  87
  88 /* Bits in control register */
  89 #define DO_SEEK         0x80
  90 #define FORMAT          0x40
  91 #define SELECT          0x20
  92 #define WRITE_SECTORS   0x10
  93 #define DO_ACTION       0x08
  94 #define DRIVE2_ENABLE   0x04
  95 #define DRIVE_ENABLE    0x02
  96 #define INTR_ENABLE     0x01
  97
  98 /* Bits in status register */
  99 #define FIFO_1BYTE      0x80
 100 #define FIFO_2BYTE      0x40
 101 #define ERROR           0x20
 102 #define DATA            0x08
 103 #define RDDATA          0x04
 104 #define INTR_PENDING    0x02
 105 #define MARK_BYTE       0x01
 106
 107 /* Bits in intr and intr_enable registers */
 108 #define ERROR_INTR      0x20
 109 #define DATA_CHANGED    0x10
 110 #define TRANSFER_DONE   0x08
 111 #define SEEN_SECTOR     0x04
 112 #define SEEK_DONE       0x02
 113 #define TIMER_DONE      0x01
 114
 115 /* Bits in error register */
 116 #define ERR_DATA_CRC    0x80
 117 #define ERR_ADDR_CRC    0x40
 118 #define ERR_OVERRUN     0x04
 119 #define ERR_UNDERRUN    0x01
 120
 121 /* Bits in setup register */
 122 #define S_SW_RESET      0x80
 123 #define S_GCR_WRITE     0x40
 124 #define S_IBM_DRIVE     0x20
 125 #define S_TEST_MODE     0x10
 126 #define S_FCLK_DIV2     0x08
 127 #define S_GCR           0x04
 128 #define S_COPY_PROT     0x02
 129 #define S_INV_WDATA     0x01
 130
 131 /* Select values for swim3_action */
 132 #define SEEK_POSITIVE   0
 133 #define SEEK_NEGATIVE   4
 134 #define STEP            1
 135 #define MOTOR_ON        2
 136 #define MOTOR_OFF       6
 137 #define INDEX           3
 138 #define EJECT           7
 139 #define SETMFM          9
 140 #define SETGCR          13
 141
 142 /* Select values for swim3_select and swim3_readbit */
 143 #define STEP_DIR        0
 144 #define STEPPING        1
 145 #define MOTOR_ON        2
 146 #define RELAX           3       /* also eject in progress */
 147 #define READ_DATA_0     4
 148 #define TWOMEG_DRIVE    5
 149 #define SINGLE_SIDED    6       /* drive or diskette is 4MB type? */
 150 #define DRIVE_PRESENT   7
 151 #define DISK_IN         8
 152 #define WRITE_PROT      9
 153 #define TRACK_ZERO      10
 154 #define TACHO           11
 155 #define READ_DATA_1     12
 156 #define MFM_MODE        13
 157 #define SEEK_COMPLETE   14
 158 #define ONEMEG_MEDIA    15
 159
 160 /* Definitions of values used in writing and formatting */
 161 #define DATA_ESCAPE     0x99
 162 #define GCR_SYNC_EXC    0x3f
 163 #define GCR_SYNC_CONV   0x80
 164 #define GCR_FIRST_MARK  0xd5
 165 #define GCR_SECOND_MARK 0xaa
 166 #define GCR_ADDR_MARK   "\xd5\xaa\x00"
 167 #define GCR_DATA_MARK   "\xd5\xaa\x0b"
 168 #define GCR_SLIP_BYTE   "\x27\xaa"
 169 #define GCR_SELF_SYNC   "\x3f\xbf\x1e\x34\x3c\x3f"
 170
 171 #define DATA_99         "\x99\x99"
 172 #define MFM_ADDR_MARK   "\x99\xa1\x99\xa1\x99\xa1\x99\xfe"
 173 #define MFM_INDEX_MARK  "\x99\xc2\x99\xc2\x99\xc2\x99\xfc"
 174 #define MFM_GAP_LEN     12
 175
 176 struct floppy_state {
 177         enum swim_state state;
 178         spinlock_t lock;
 179         struct swim3 __iomem *swim3;    /* hardware registers */
 180         struct dbdma_regs __iomem *dma; /* DMA controller registers */
 181         int     swim3_intr;     /* interrupt number for SWIM3 */
 182         int     dma_intr;       /* interrupt number for DMA channel */
 183         int     cur_cyl;        /* cylinder head is on, or -1 */
 184         int     cur_sector;     /* last sector we saw go past */
 185         int     req_cyl;        /* the cylinder for the current r/w request */
 186         int     head;           /* head number ditto */
 187         int     req_sector;     /* sector number ditto */
 188         int     scount;         /* # sectors we're transferring at present */
 189         int     retries;
 190         int     settle_time;
 191         int     secpercyl;      /* disk geometry information */
 192         int     secpertrack;
 193         int     total_secs;
 194         int     write_prot;     /* 1 if write-protected, 0 if not, -1 dunno */
 195         struct dbdma_cmd *dma_cmd;
 196         int     ref_count;
 197         int     expect_cyl;
 198         struct timer_list timeout;
 199         int     timeout_pending;
 200         int     ejected;
 201         wait_queue_head_t wait;
 202         int     wanted;
 203         struct device_node*     media_bay; /* NULL when not in bay */
 204         char    dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
 205 };
 206
 207 static struct floppy_state floppy_states[MAX_FLOPPIES];
 208 static int floppy_count = 0;
 209 static DEFINE_SPINLOCK(swim3_lock);
 210
 211 static unsigned short write_preamble[] = {
 212         0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */
 213         0, 0, 0, 0, 0, 0,                       /* sync field */
 214         0x99a1, 0x99a1, 0x99a1, 0x99fb,         /* data address mark */
 215         0x990f                                  /* no escape for 512 bytes */
 216 };
 217
 218 static unsigned short write_postamble[] = {
 219         0x9904,                                 /* insert CRC */
 220         0x4e4e, 0x4e4e,
 221         0x9908,                                 /* stop writing */
 222         0, 0, 0, 0, 0, 0
 223 };
 224
 225 static void swim3_select(struct floppy_state *fs, int sel);
 226 static void swim3_action(struct floppy_state *fs, int action);
 227 static int swim3_readbit(struct floppy_state *fs, int bit);
 228 static void do_fd_request(request_queue_t * q);
 229 static void start_request(struct floppy_state *fs);
 230 static void set_timeout(struct floppy_state *fs, int nticks,
 231                         void (*proc)(unsigned long));
 232 static void scan_track(struct floppy_state *fs);
 233 static void seek_track(struct floppy_state *fs, int n);
 234 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count);
 235 static void setup_transfer(struct floppy_state *fs);
 236 static void act(struct floppy_state *fs);
 237 static void scan_timeout(unsigned long data);
 238 static void seek_timeout(unsigned long data);
 239 static void settle_timeout(unsigned long data);
 240 static void xfer_timeout(unsigned long data);
 241 static irqreturn_t swim3_interrupt(int irq, void *dev_id, struct pt_regs *regs);
 242 /*static void fd_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs);*/
 243 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 244                       int interruptible);
 245 static void release_drive(struct floppy_state *fs);
 246 static int fd_eject(struct floppy_state *fs);
 247 static int floppy_ioctl(struct inode *inode, struct file *filp,
 248                         unsigned int cmd, unsigned long param);
 249 static int floppy_open(struct inode *inode, struct file *filp);
 250 static int floppy_release(struct inode *inode, struct file *filp);
 251 static int floppy_check_change(struct gendisk *disk);
 252 static int floppy_revalidate(struct gendisk *disk);
 253 static int swim3_add_device(struct device_node *swims);
 254 int swim3_init(void);
 255
 256 #ifndef CONFIG_PMAC_MEDIABAY
 257 #define check_media_bay(which, what)    1
 258 #endif
 259
 260 static void swim3_select(struct floppy_state *fs, int sel)
 261 {
 262         struct swim3 __iomem *sw = fs->swim3;
 263
 264         out_8(&sw->select, RELAX);
 265         if (sel & 8)
 266                 out_8(&sw->control_bis, SELECT);
 267         else
 268                 out_8(&sw->control_bic, SELECT);
 269         out_8(&sw->select, sel & CA_MASK);
 270 }
 271
 272 static void swim3_action(struct floppy_state *fs, int action)
 273 {
 274         struct swim3 __iomem *sw = fs->swim3;
 275
 276         swim3_select(fs, action);
 277         udelay(1);
 278         out_8(&sw->select, sw->select | LSTRB);
 279         udelay(2);
 280         out_8(&sw->select, sw->select & ~LSTRB);
 281         udelay(1);
 282 }
 283
 284 static int swim3_readbit(struct floppy_state *fs, int bit)
 285 {
 286         struct swim3 __iomem *sw = fs->swim3;
 287         int stat;
 288
 289         swim3_select(fs, bit);
 290         udelay(1);
 291         stat = in_8(&sw->status);
 292         return (stat & DATA) == 0;
 293 }
 294
 295 static void do_fd_request(request_queue_t * q)
 296 {
 297         int i;
 298         for(i=0;i<floppy_count;i++)
 299         {
 300 #ifdef CONFIG_PMAC_MEDIABAY
 301                 if (floppy_states[i].media_bay &&
 302                         check_media_bay(floppy_states[i].media_bay, MB_FD))
 303                         continue;
 304 #endif /* CONFIG_PMAC_MEDIABAY */
 305                 start_request(&floppy_states[i]);
 306         }
 307 }
 308
 309 static void start_request(struct floppy_state *fs)
 310 {
 311         struct request *req;
 312         unsigned long x;
 313
 314         if (fs->state == idle && fs->wanted) {
 315                 fs->state = available;
 316                 wake_up(&fs->wait);
 317                 return;
 318         }
 319         while (fs->state == idle && (req = elv_next_request(swim3_queue))) {
 320 #if 0
 321                 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%ld buf=%p\n",
 322                        req->rq_disk->disk_name, req->cmd,
 323                        (long)req->sector, req->nr_sectors, req->buffer);
 324                 printk("           rq_status=%d errors=%d current_nr_sectors=%ld\n",
 325                        req->rq_status, req->errors, req->current_nr_sectors);
 326 #endif
 327
 328                 if (req->sector < 0 || req->sector >= fs->total_secs) {
 329                         end_request(req, 0);
 330                         continue;
 331                 }
 332                 if (req->current_nr_sectors == 0) {
 333                         end_request(req, 1);
 334                         continue;
 335                 }
 336                 if (fs->ejected) {
 337                         end_request(req, 0);
 338                         continue;
 339                 }
 340
 341                 if (rq_data_dir(req) == WRITE) {
 342                         if (fs->write_prot < 0)
 343                                 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 344                         if (fs->write_prot) {
 345                                 end_request(req, 0);
 346                                 continue;
 347                         }
 348                 }
 349
 350                 /* Do not remove the cast. req->sector is now a sector_t and
 351                  * can be 64 bits, but it will never go past 32 bits for this
 352                  * driver anyway, so we can safely cast it down and not have
 353                  * to do a 64/32 division
 354                  */
 355                 fs->req_cyl = ((long)req->sector) / fs->secpercyl;
 356                 x = ((long)req->sector) % fs->secpercyl;
 357                 fs->head = x / fs->secpertrack;
 358                 fs->req_sector = x % fs->secpertrack + 1;
 359                 fd_req = req;
 360                 fs->state = do_transfer;
 361                 fs->retries = 0;
 362
 363                 act(fs);
 364         }
 365 }
 366
 367 static void set_timeout(struct floppy_state *fs, int nticks,
 368                         void (*proc)(unsigned long))
 369 {
 370         unsigned long flags;
 371
 372         spin_lock_irqsave(&fs->lock, flags);
 373         if (fs->timeout_pending)
 374                 del_timer(&fs->timeout);
 375         fs->timeout.expires = jiffies + nticks;
 376         fs->timeout.function = proc;
 377         fs->timeout.data = (unsigned long) fs;
 378         add_timer(&fs->timeout);
 379         fs->timeout_pending = 1;
 380         spin_unlock_irqrestore(&fs->lock, flags);
 381 }
 382
 383 static inline void scan_track(struct floppy_state *fs)
 384 {
 385         struct swim3 __iomem *sw = fs->swim3;
 386
 387         swim3_select(fs, READ_DATA_0);
 388         in_8(&sw->intr);                /* clear SEEN_SECTOR bit */
 389         in_8(&sw->error);
 390         out_8(&sw->intr_enable, SEEN_SECTOR);
 391         out_8(&sw->control_bis, DO_ACTION);
 392         /* enable intr when track found */
 393         set_timeout(fs, HZ, scan_timeout);      /* enable timeout */
 394 }
 395
 396 static inline void seek_track(struct floppy_state *fs, int n)
 397 {
 398         struct swim3 __iomem *sw = fs->swim3;
 399
 400         if (n >= 0) {
 401                 swim3_action(fs, SEEK_POSITIVE);
 402                 sw->nseek = n;
 403         } else {
 404                 swim3_action(fs, SEEK_NEGATIVE);
 405                 sw->nseek = -n;
 406         }
 407         fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
 408         swim3_select(fs, STEP);
 409         in_8(&sw->error);
 410         /* enable intr when seek finished */
 411         out_8(&sw->intr_enable, SEEK_DONE);
 412         out_8(&sw->control_bis, DO_SEEK);
 413         set_timeout(fs, 3*HZ, seek_timeout);    /* enable timeout */
 414         fs->settle_time = 0;
 415 }
 416
 417 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
 418                             void *buf, int count)
 419 {
 420         st_le16(&cp->req_count, count);
 421         st_le16(&cp->command, cmd);
 422         st_le32(&cp->phy_addr, virt_to_bus(buf));
 423         cp->xfer_status = 0;
 424 }
 425
 426 static inline void setup_transfer(struct floppy_state *fs)
 427 {
 428         int n;
 429         struct swim3 __iomem *sw = fs->swim3;
 430         struct dbdma_cmd *cp = fs->dma_cmd;
 431         struct dbdma_regs __iomem *dr = fs->dma;
 432
 433         if (fd_req->current_nr_sectors <= 0) {
 434                 printk(KERN_ERR "swim3: transfer 0 sectors?\n");
 435                 return;
 436         }
 437         if (rq_data_dir(fd_req) == WRITE)
 438                 n = 1;
 439         else {
 440                 n = fs->secpertrack - fs->req_sector + 1;
 441                 if (n > fd_req->current_nr_sectors)
 442                         n = fd_req->current_nr_sectors;
 443         }
 444         fs->scount = n;
 445         swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
 446         out_8(&sw->sector, fs->req_sector);
 447         out_8(&sw->nsect, n);
 448         out_8(&sw->gap3, 0);
 449         out_le32(&dr->cmdptr, virt_to_bus(cp));
 450         if (rq_data_dir(fd_req) == WRITE) {
 451                 /* Set up 3 dma commands: write preamble, data, postamble */
 452                 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
 453                 ++cp;
 454                 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512);
 455                 ++cp;
 456                 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
 457         } else {
 458                 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512);
 459         }
 460         ++cp;
 461         out_le16(&cp->command, DBDMA_STOP);
 462         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 463         in_8(&sw->error);
 464         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 465         if (rq_data_dir(fd_req) == WRITE)
 466                 out_8(&sw->control_bis, WRITE_SECTORS);
 467         in_8(&sw->intr);
 468         out_le32(&dr->control, (RUN << 16) | RUN);
 469         /* enable intr when transfer complete */
 470         out_8(&sw->intr_enable, TRANSFER_DONE);
 471         out_8(&sw->control_bis, DO_ACTION);
 472         set_timeout(fs, 2*HZ, xfer_timeout);    /* enable timeout */
 473 }
 474
 475 static void act(struct floppy_state *fs)
 476 {
 477         for (;;) {
 478                 switch (fs->state) {
 479                 case idle:
 480                         return;         /* XXX shouldn't get here */
 481
 482                 case locating:
 483                         if (swim3_readbit(fs, TRACK_ZERO)) {
 484                                 fs->cur_cyl = 0;
 485                                 if (fs->req_cyl == 0)
 486                                         fs->state = do_transfer;
 487                                 else
 488                                         fs->state = seeking;
 489                                 break;
 490                         }
 491                         scan_track(fs);
 492                         return;
 493
 494                 case seeking:
 495                         if (fs->cur_cyl < 0) {
 496                                 fs->expect_cyl = -1;
 497                                 fs->state = locating;
 498                                 break;
 499                         }
 500                         if (fs->req_cyl == fs->cur_cyl) {
 501                                 printk("whoops, seeking 0\n");
 502                                 fs->state = do_transfer;
 503                                 break;
 504                         }
 505                         seek_track(fs, fs->req_cyl - fs->cur_cyl);
 506                         return;
 507
 508                 case settling:
 509                         /* check for SEEK_COMPLETE after 30ms */
 510                         fs->settle_time = (HZ + 32) / 33;
 511                         set_timeout(fs, fs->settle_time, settle_timeout);
 512                         return;
 513
 514                 case do_transfer:
 515                         if (fs->cur_cyl != fs->req_cyl) {
 516                                 if (fs->retries > 5) {
 517                                         end_request(fd_req, 0);
 518                                         fs->state = idle;
 519                                         return;
 520                                 }
 521                                 fs->state = seeking;
 522                                 break;
 523                         }
 524                         setup_transfer(fs);
 525                         return;
 526
 527                 case jogging:
 528                         seek_track(fs, -5);
 529                         return;
 530
 531                 default:
 532                         printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
 533                         return;
 534                 }
 535         }
 536 }
 537
 538 static void scan_timeout(unsigned long data)
 539 {
 540         struct floppy_state *fs = (struct floppy_state *) data;
 541         struct swim3 __iomem *sw = fs->swim3;
 542
 543         fs->timeout_pending = 0;
 544         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 545         out_8(&sw->select, RELAX);
 546         out_8(&sw->intr_enable, 0);
 547         fs->cur_cyl = -1;
 548         if (fs->retries > 5) {
 549                 end_request(fd_req, 0);
 550                 fs->state = idle;
 551                 start_request(fs);
 552         } else {
 553                 fs->state = jogging;
 554                 act(fs);
 555         }
 556 }
 557
 558 static void seek_timeout(unsigned long data)
 559 {
 560         struct floppy_state *fs = (struct floppy_state *) data;
 561         struct swim3 __iomem *sw = fs->swim3;
 562
 563         fs->timeout_pending = 0;
 564         out_8(&sw->control_bic, DO_SEEK);
 565         out_8(&sw->select, RELAX);
 566         out_8(&sw->intr_enable, 0);
 567         printk(KERN_ERR "swim3: seek timeout\n");
 568         end_request(fd_req, 0);
 569         fs->state = idle;
 570         start_request(fs);
 571 }
 572
 573 static void settle_timeout(unsigned long data)
 574 {
 575         struct floppy_state *fs = (struct floppy_state *) data;
 576         struct swim3 __iomem *sw = fs->swim3;
 577
 578         fs->timeout_pending = 0;
 579         if (swim3_readbit(fs, SEEK_COMPLETE)) {
 580                 out_8(&sw->select, RELAX);
 581                 fs->state = locating;
 582                 act(fs);
 583                 return;
 584         }
 585         out_8(&sw->select, RELAX);
 586         if (fs->settle_time < 2*HZ) {
 587                 ++fs->settle_time;
 588                 set_timeout(fs, 1, settle_timeout);
 589                 return;
 590         }
 591         printk(KERN_ERR "swim3: seek settle timeout\n");
 592         end_request(fd_req, 0);
 593         fs->state = idle;
 594         start_request(fs);
 595 }
 596
 597 static void xfer_timeout(unsigned long data)
 598 {
 599         struct floppy_state *fs = (struct floppy_state *) data;
 600         struct swim3 __iomem *sw = fs->swim3;
 601         struct dbdma_regs __iomem *dr = fs->dma;
 602         struct dbdma_cmd *cp = fs->dma_cmd;
 603         unsigned long s;
 604         int n;
 605
 606         fs->timeout_pending = 0;
 607         out_le32(&dr->control, RUN << 16);
 608         /* We must wait a bit for dbdma to stop */
 609         for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
 610                 udelay(1);
 611         out_8(&sw->intr_enable, 0);
 612         out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 613         out_8(&sw->select, RELAX);
 614         if (rq_data_dir(fd_req) == WRITE)
 615                 ++cp;
 616         if (ld_le16(&cp->xfer_status) != 0)
 617                 s = fs->scount - ((ld_le16(&cp->res_count) + 511) >> 9);
 618         else
 619                 s = 0;
 620         fd_req->sector += s;
 621         fd_req->current_nr_sectors -= s;
 622         printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
 623                (rq_data_dir(fd_req)==WRITE? "writ": "read"), (long)fd_req->sector);
 624         end_request(fd_req, 0);
 625         fs->state = idle;
 626         start_request(fs);
 627 }
 628
 629 static irqreturn_t swim3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 630 {
 631         struct floppy_state *fs = (struct floppy_state *) dev_id;
 632         struct swim3 __iomem *sw = fs->swim3;
 633         int intr, err, n;
 634         int stat, resid;
 635         struct dbdma_regs __iomem *dr;
 636         struct dbdma_cmd *cp;
 637
 638         intr = in_8(&sw->intr);
 639         err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
 640         if ((intr & ERROR_INTR) && fs->state != do_transfer)
 641                 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%lx, intr=%x, err=%x\n",
 642                        fs->state, rq_data_dir(fd_req), intr, err);
 643         switch (fs->state) {
 644         case locating:
 645                 if (intr & SEEN_SECTOR) {
 646                         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 647                         out_8(&sw->select, RELAX);
 648                         out_8(&sw->intr_enable, 0);
 649                         del_timer(&fs->timeout);
 650                         fs->timeout_pending = 0;
 651                         if (sw->ctrack == 0xff) {
 652                                 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
 653                                 fs->cur_cyl = -1;
 654                                 if (fs->retries > 5) {
 655                                         end_request(fd_req, 0);
 656                                         fs->state = idle;
 657                                         start_request(fs);
 658                                 } else {
 659                                         fs->state = jogging;
 660                                         act(fs);
 661                                 }
 662                                 break;
 663                         }
 664                         fs->cur_cyl = sw->ctrack;
 665                         fs->cur_sector = sw->csect;
 666                         if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
 667                                 printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
 668                                        fs->expect_cyl, fs->cur_cyl);
 669                         fs->state = do_transfer;
 670                         act(fs);
 671                 }
 672                 break;
 673         case seeking:
 674         case jogging:
 675                 if (sw->nseek == 0) {
 676                         out_8(&sw->control_bic, DO_SEEK);
 677                         out_8(&sw->select, RELAX);
 678                         out_8(&sw->intr_enable, 0);
 679                         del_timer(&fs->timeout);
 680                         fs->timeout_pending = 0;
 681                         if (fs->state == seeking)
 682                                 ++fs->retries;
 683                         fs->state = settling;
 684                         act(fs);
 685                 }
 686                 break;
 687         case settling:
 688                 out_8(&sw->intr_enable, 0);
 689                 del_timer(&fs->timeout);
 690                 fs->timeout_pending = 0;
 691                 act(fs);
 692                 break;
 693         case do_transfer:
 694                 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
 695                         break;
 696                 out_8(&sw->intr_enable, 0);
 697                 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 698                 out_8(&sw->select, RELAX);
 699                 del_timer(&fs->timeout);
 700                 fs->timeout_pending = 0;
 701                 dr = fs->dma;
 702                 cp = fs->dma_cmd;
 703                 if (rq_data_dir(fd_req) == WRITE)
 704                         ++cp;
 705                 /*
 706                  * Check that the main data transfer has finished.
 707                  * On writing, the swim3 sometimes doesn't use
 708                  * up all the bytes of the postamble, so we can still
 709                  * see DMA active here.  That doesn't matter as long
 710                  * as all the sector data has been transferred.
 711                  */
 712                 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
 713                         /* wait a little while for DMA to complete */
 714                         for (n = 0; n < 100; ++n) {
 715                                 if (cp->xfer_status != 0)
 716                                         break;
 717                                 udelay(1);
 718                                 barrier();
 719                         }
 720                 }
 721                 /* turn off DMA */
 722                 out_le32(&dr->control, (RUN | PAUSE) << 16);
 723                 stat = ld_le16(&cp->xfer_status);
 724                 resid = ld_le16(&cp->res_count);
 725                 if (intr & ERROR_INTR) {
 726                         n = fs->scount - 1 - resid / 512;
 727                         if (n > 0) {
 728                                 fd_req->sector += n;
 729                                 fd_req->current_nr_sectors -= n;
 730                                 fd_req->buffer += n * 512;
 731                                 fs->req_sector += n;
 732                         }
 733                         if (fs->retries < 5) {
 734                                 ++fs->retries;
 735                                 act(fs);
 736                         } else {
 737                                 printk("swim3: error %sing block %ld (err=%x)\n",
 738                                        rq_data_dir(fd_req) == WRITE? "writ": "read",
 739                                        (long)fd_req->sector, err);
 740                                 end_request(fd_req, 0);
 741                                 fs->state = idle;
 742                         }
 743                 } else {
 744                         if ((stat & ACTIVE) == 0 || resid != 0) {
 745                                 /* musta been an error */
 746                                 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
 747                                 printk(KERN_ERR "  state=%d, dir=%lx, intr=%x, err=%x\n",
 748                                        fs->state, rq_data_dir(fd_req), intr, err);
 749                                 end_request(fd_req, 0);
 750                                 fs->state = idle;
 751                                 start_request(fs);
 752                                 break;
 753                         }
 754                         fd_req->sector += fs->scount;
 755                         fd_req->current_nr_sectors -= fs->scount;
 756                         fd_req->buffer += fs->scount * 512;
 757                         if (fd_req->current_nr_sectors <= 0) {
 758                                 end_request(fd_req, 1);
 759                                 fs->state = idle;
 760                         } else {
 761                                 fs->req_sector += fs->scount;
 762                                 if (fs->req_sector > fs->secpertrack) {
 763                                         fs->req_sector -= fs->secpertrack;
 764                                         if (++fs->head > 1) {
 765                                                 fs->head = 0;
 766                                                 ++fs->req_cyl;
 767                                         }
 768                                 }
 769                                 act(fs);
 770                         }
 771                 }
 772                 if (fs->state == idle)
 773                         start_request(fs);
 774                 break;
 775         default:
 776                 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);
 777         }
 778         return IRQ_HANDLED;
 779 }
 780
 781 /*
 782 static void fd_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 783 {
 784 }
 785 */
 786
 787 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 788                       int interruptible)
 789 {
 790         unsigned long flags;
 791
 792         spin_lock_irqsave(&fs->lock, flags);
 793         if (fs->state != idle) {
 794                 ++fs->wanted;
 795                 while (fs->state != available) {
 796                         if (interruptible && signal_pending(current)) {
 797                                 --fs->wanted;
 798                                 spin_unlock_irqrestore(&fs->lock, flags);
 799                                 return -EINTR;
 800                         }
 801                         interruptible_sleep_on(&fs->wait);
 802                 }
 803                 --fs->wanted;
 804         }
 805         fs->state = state;
 806         spin_unlock_irqrestore(&fs->lock, flags);
 807         return 0;
 808 }
 809
 810 static void release_drive(struct floppy_state *fs)
 811 {
 812         unsigned long flags;
 813
 814         spin_lock_irqsave(&fs->lock, flags);
 815         fs->state = idle;
 816         start_request(fs);
 817         spin_unlock_irqrestore(&fs->lock, flags);
 818 }
 819
 820 static int fd_eject(struct floppy_state *fs)
 821 {
 822         int err, n;
 823
 824         err = grab_drive(fs, ejecting, 1);
 825         if (err)
 826                 return err;
 827         swim3_action(fs, EJECT);
 828         for (n = 20; n > 0; --n) {
 829                 if (signal_pending(current)) {
 830                         err = -EINTR;
 831                         break;
 832                 }
 833                 swim3_select(fs, RELAX);
 834                 schedule_timeout_interruptible(1);
 835                 if (swim3_readbit(fs, DISK_IN) == 0)
 836                         break;
 837         }
 838         swim3_select(fs, RELAX);
 839         udelay(150);
 840         fs->ejected = 1;
 841         release_drive(fs);
 842         return err;
 843 }
 844
 845 static struct floppy_struct floppy_type =
 846         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL };    /*  7 1.44MB 3.5"   */
 847
 848 static int floppy_ioctl(struct inode *inode, struct file *filp,
 849                         unsigned int cmd, unsigned long param)
 850 {
 851         struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
 852         int err;
 853
 854         if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
 855                 return -EPERM;
 856
 857 #ifdef CONFIG_PMAC_MEDIABAY
 858         if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
 859                 return -ENXIO;
 860 #endif
 861
 862         switch (cmd) {
 863         case FDEJECT:
 864                 if (fs->ref_count != 1)
 865                         return -EBUSY;
 866                 err = fd_eject(fs);
 867                 return err;
 868         case FDGETPRM:
 869                 if (copy_to_user((void __user *) param, &floppy_type,
 870                                  sizeof(struct floppy_struct)))
 871                         return -EFAULT;
 872                 return 0;
 873         }
 874         return -ENOTTY;
 875 }
 876
 877 static int floppy_open(struct inode *inode, struct file *filp)
 878 {
 879         struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
 880         struct swim3 __iomem *sw = fs->swim3;
 881         int n, err = 0;
 882
 883         if (fs->ref_count == 0) {
 884 #ifdef CONFIG_PMAC_MEDIABAY
 885                 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
 886                         return -ENXIO;
 887 #endif
 888                 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
 889                 out_8(&sw->control_bic, 0xff);
 890                 out_8(&sw->mode, 0x95);
 891                 udelay(10);
 892                 out_8(&sw->intr_enable, 0);
 893                 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
 894                 swim3_action(fs, MOTOR_ON);
 895                 fs->write_prot = -1;
 896                 fs->cur_cyl = -1;
 897                 for (n = 0; n < 2 * HZ; ++n) {
 898                         if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
 899                                 break;
 900                         if (signal_pending(current)) {
 901                                 err = -EINTR;
 902                                 break;
 903                         }
 904                         swim3_select(fs, RELAX);
 905                         schedule_timeout_interruptible(1);
 906                 }
 907                 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
 908                                  || swim3_readbit(fs, DISK_IN) == 0))
 909                         err = -ENXIO;
 910                 swim3_action(fs, SETMFM);
 911                 swim3_select(fs, RELAX);
 912
 913         } else if (fs->ref_count == -1 || filp->f_flags & O_EXCL)
 914                 return -EBUSY;
 915
 916         if (err == 0 && (filp->f_flags & O_NDELAY) == 0
 917             && (filp->f_mode & 3)) {
 918                 check_disk_change(inode->i_bdev);
 919                 if (fs->ejected)
 920                         err = -ENXIO;
 921         }
 922
 923         if (err == 0 && (filp->f_mode & 2)) {
 924                 if (fs->write_prot < 0)
 925                         fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 926                 if (fs->write_prot)
 927                         err = -EROFS;
 928         }
 929
 930         if (err) {
 931                 if (fs->ref_count == 0) {
 932                         swim3_action(fs, MOTOR_OFF);
 933                         out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
 934                         swim3_select(fs, RELAX);
 935                 }
 936                 return err;
 937         }
 938
 939         if (filp->f_flags & O_EXCL)
 940                 fs->ref_count = -1;
 941         else
 942                 ++fs->ref_count;
 943
 944         return 0;
 945 }
 946
 947 static int floppy_release(struct inode *inode, struct file *filp)
 948 {
 949         struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
 950         struct swim3 __iomem *sw = fs->swim3;
 951         if (fs->ref_count > 0 && --fs->ref_count == 0) {
 952                 swim3_action(fs, MOTOR_OFF);
 953                 out_8(&sw->control_bic, 0xff);
 954                 swim3_select(fs, RELAX);
 955         }
 956         return 0;
 957 }
 958
 959 static int floppy_check_change(struct gendisk *disk)
 960 {
 961         struct floppy_state *fs = disk->private_data;
 962         return fs->ejected;
 963 }
 964
 965 static int floppy_revalidate(struct gendisk *disk)
 966 {
 967         struct floppy_state *fs = disk->private_data;
 968         struct swim3 __iomem *sw;
 969         int ret, n;
 970
 971 #ifdef CONFIG_PMAC_MEDIABAY
 972         if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
 973                 return -ENXIO;
 974 #endif
 975
 976         sw = fs->swim3;
 977         grab_drive(fs, revalidating, 0);
 978         out_8(&sw->intr_enable, 0);
 979         out_8(&sw->control_bis, DRIVE_ENABLE);
 980         swim3_action(fs, MOTOR_ON);     /* necessary? */
 981         fs->write_prot = -1;
 982         fs->cur_cyl = -1;
 983         mdelay(1);
 984         for (n = HZ; n > 0; --n) {
 985                 if (swim3_readbit(fs, SEEK_COMPLETE))
 986                         break;
 987                 if (signal_pending(current))
 988                         break;
 989                 swim3_select(fs, RELAX);
 990                 schedule_timeout_interruptible(1);
 991         }
 992         ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
 993                 || swim3_readbit(fs, DISK_IN) == 0;
 994         if (ret)
 995                 swim3_action(fs, MOTOR_OFF);
 996         else {
 997                 fs->ejected = 0;
 998                 swim3_action(fs, SETMFM);
 999         }
1000         swim3_select(fs, RELAX);
1001
1002         release_drive(fs);
1003         return ret;
1004 }
1005
1006 static struct block_device_operations floppy_fops = {
1007         .open           = floppy_open,
1008         .release        = floppy_release,
1009         .ioctl          = floppy_ioctl,
1010         .media_changed  = floppy_check_change,
1011         .revalidate_disk= floppy_revalidate,
1012 };
1013
1014 int swim3_init(void)
1015 {
1016         struct device_node *swim;
1017         int err = -ENOMEM;
1018         int i;
1019
1020         swim = find_devices("floppy");
1021         while (swim && (floppy_count < MAX_FLOPPIES))
1022         {
1023                 swim3_add_device(swim);
1024                 swim = swim->next;
1025         }
1026
1027         swim = find_devices("swim3");
1028         while (swim && (floppy_count < MAX_FLOPPIES))
1029         {
1030                 swim3_add_device(swim);
1031                 swim = swim->next;
1032         }
1033
1034         if (!floppy_count)
1035                 return -ENODEV;
1036
1037         for (i = 0; i < floppy_count; i++) {
1038                 disks[i] = alloc_disk(1);
1039                 if (!disks[i])
1040                         goto out;
1041         }
1042
1043         if (register_blkdev(FLOPPY_MAJOR, "fd")) {
1044                 err = -EBUSY;
1045                 goto out;
1046         }
1047
1048         swim3_queue = blk_init_queue(do_fd_request, &swim3_lock);
1049         if (!swim3_queue) {
1050                 err = -ENOMEM;
1051                 goto out_queue;
1052         }
1053
1054         for (i = 0; i < floppy_count; i++) {
1055                 struct gendisk *disk = disks[i];
1056                 disk->major = FLOPPY_MAJOR;
1057                 disk->first_minor = i;
1058                 disk->fops = &floppy_fops;
1059                 disk->private_data = &floppy_states[i];
1060                 disk->queue = swim3_queue;
1061                 disk->flags |= GENHD_FL_REMOVABLE;
1062                 sprintf(disk->disk_name, "fd%d", i);
1063                 set_capacity(disk, 2880);
1064                 add_disk(disk);
1065         }
1066         return 0;
1067
1068 out_queue:
1069         unregister_blkdev(FLOPPY_MAJOR, "fd");
1070 out:
1071         while (i--)
1072                 put_disk(disks[i]);
1073         /* shouldn't we do something with results of swim_add_device()? */
1074         return err;
1075 }
1076
1077 static int swim3_add_device(struct device_node *swim)
1078 {
1079         struct device_node *mediabay;
1080         struct floppy_state *fs = &floppy_states[floppy_count];
1081         struct resource res_reg, res_dma;
1082
1083         if (of_address_to_resource(swim, 0, &res_reg) ||
1084             of_address_to_resource(swim, 1, &res_dma)) {
1085                 printk(KERN_ERR "swim3: Can't get addresses\n");
1086                 return -EINVAL;
1087         }
1088         if (request_mem_region(res_reg.start, res_reg.end - res_reg.start + 1,
1089                                " (reg)") == NULL) {
1090                 printk(KERN_ERR "swim3: Can't request register space\n");
1091                 return -EINVAL;
1092         }
1093         if (request_mem_region(res_dma.start, res_dma.end - res_dma.start + 1,
1094                                " (dma)") == NULL) {
1095                 release_mem_region(res_reg.start,
1096                                    res_reg.end - res_reg.start + 1);
1097                 printk(KERN_ERR "swim3: Can't request DMA space\n");
1098                 return -EINVAL;
1099         }
1100
1101         if (swim->n_intrs < 2) {
1102                 printk(KERN_INFO "swim3: expecting 2 intrs (n_intrs:%d)\n",
1103                        swim->n_intrs);
1104                 release_mem_region(res_reg.start,
1105                                    res_reg.end - res_reg.start + 1);
1106                 release_mem_region(res_dma.start,
1107                                    res_dma.end - res_dma.start + 1);
1108                 return -EINVAL;
1109         }
1110
1111         mediabay = (strcasecmp(swim->parent->type, "media-bay") == 0) ? swim->parent : NULL;
1112         if (mediabay == NULL)
1113                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1114
1115         memset(fs, 0, sizeof(*fs));
1116         spin_lock_init(&fs->lock);
1117         fs->state = idle;
1118         fs->swim3 = (struct swim3 __iomem *)ioremap(res_reg.start, 0x200);
1119         fs->dma = (struct dbdma_regs __iomem *)ioremap(res_dma.start, 0x200);
1120         fs->swim3_intr = swim->intrs[0].line;
1121         fs->dma_intr = swim->intrs[1].line;
1122         fs->cur_cyl = -1;
1123         fs->cur_sector = -1;
1124         fs->secpercyl = 36;
1125         fs->secpertrack = 18;
1126         fs->total_secs = 2880;
1127         fs->media_bay = mediabay;
1128         init_waitqueue_head(&fs->wait);
1129
1130         fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1131         memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1132         st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1133
1134         if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1135                 printk(KERN_ERR "Couldn't get irq %d for SWIM3\n", fs->swim3_intr);
1136                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1137                 return -EBUSY;
1138         }
1139 /*
1140         if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
1141                 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
1142                        fs->dma_intr);
1143                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1144                 return -EBUSY;
1145         }
1146 */
1147
1148         init_timer(&fs->timeout);
1149
1150         printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
1151                 mediabay ? "in media bay" : "");
1152
1153         floppy_count++;
1154
1155         return 0;
1156 }
1157
1158 module_init(swim3_init)
1159
1160 MODULE_LICENSE("GPL");
1161 MODULE_AUTHOR("Paul Mackerras");
1162 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);