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/config.h>
  20 #include <linux/stddef.h>
  21 #include <linux/kernel.h>
  22 #include <linux/sched.h>
  23 #include <linux/timer.h>
  24 #include <linux/delay.h>
  25 #include <linux/fd.h>
  26 #include <linux/ioctl.h>
  27 #include <linux/blkdev.h>
  28 #include <linux/devfs_fs_kernel.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/module.h>
  31 #include <linux/spinlock.h>
  32 #include <asm/io.h>
  33 #include <asm/dbdma.h>
  34 #include <asm/prom.h>
  35 #include <asm/uaccess.h>
  36 #include <asm/mediabay.h>
  37 #include <asm/machdep.h>
  38 #include <asm/pmac_feature.h>
  39
  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 device_node*     media_bay; /* NULL when not in bay */
 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(request_queue_t * 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, struct pt_regs *regs);
 244 /*static void fd_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs);*/
 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 inode *inode, struct file *filp,
 250                         unsigned int cmd, unsigned long param);
 251 static int floppy_open(struct inode *inode, struct file *filp);
 252 static int floppy_release(struct inode *inode, struct file *filp);
 253 static int floppy_check_change(struct gendisk *disk);
 254 static int floppy_revalidate(struct gendisk *disk);
 255 static int swim3_add_device(struct device_node *swims);
 256 int swim3_init(void);
 257
 258 #ifndef CONFIG_PMAC_MEDIABAY
 259 #define check_media_bay(which, what)    1
 260 #endif
 261
 262 static void swim3_select(struct floppy_state *fs, int sel)
 263 {
 264         struct swim3 __iomem *sw = fs->swim3;
 265
 266         out_8(&sw->select, RELAX);
 267         if (sel & 8)
 268                 out_8(&sw->control_bis, SELECT);
 269         else
 270                 out_8(&sw->control_bic, SELECT);
 271         out_8(&sw->select, sel & CA_MASK);
 272 }
 273
 274 static void swim3_action(struct floppy_state *fs, int action)
 275 {
 276         struct swim3 __iomem *sw = fs->swim3;
 277
 278         swim3_select(fs, action);
 279         udelay(1);
 280         out_8(&sw->select, sw->select | LSTRB);
 281         udelay(2);
 282         out_8(&sw->select, sw->select & ~LSTRB);
 283         udelay(1);
 284 }
 285
 286 static int swim3_readbit(struct floppy_state *fs, int bit)
 287 {
 288         struct swim3 __iomem *sw = fs->swim3;
 289         int stat;
 290
 291         swim3_select(fs, bit);
 292         udelay(1);
 293         stat = in_8(&sw->status);
 294         return (stat & DATA) == 0;
 295 }
 296
 297 static void do_fd_request(request_queue_t * q)
 298 {
 299         int i;
 300         for(i=0;i<floppy_count;i++)
 301         {
 302 #ifdef CONFIG_PMAC_MEDIABAY
 303                 if (floppy_states[i].media_bay &&
 304                         check_media_bay(floppy_states[i].media_bay, MB_FD))
 305                         continue;
 306 #endif /* CONFIG_PMAC_MEDIABAY */
 307                 start_request(&floppy_states[i]);
 308         }
 309 }
 310
 311 static void start_request(struct floppy_state *fs)
 312 {
 313         struct request *req;
 314         unsigned long x;
 315
 316         if (fs->state == idle && fs->wanted) {
 317                 fs->state = available;
 318                 wake_up(&fs->wait);
 319                 return;
 320         }
 321         while (fs->state == idle && (req = elv_next_request(swim3_queue))) {
 322 #if 0
 323                 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%ld buf=%p\n",
 324                        req->rq_disk->disk_name, req->cmd,
 325                        (long)req->sector, req->nr_sectors, req->buffer);
 326                 printk("           rq_status=%d errors=%d current_nr_sectors=%ld\n",
 327                        req->rq_status, req->errors, req->current_nr_sectors);
 328 #endif
 329
 330                 if (req->sector < 0 || req->sector >= fs->total_secs) {
 331                         end_request(req, 0);
 332                         continue;
 333                 }
 334                 if (req->current_nr_sectors == 0) {
 335                         end_request(req, 1);
 336                         continue;
 337                 }
 338                 if (fs->ejected) {
 339                         end_request(req, 0);
 340                         continue;
 341                 }
 342
 343                 if (rq_data_dir(req) == WRITE) {
 344                         if (fs->write_prot < 0)
 345                                 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 346                         if (fs->write_prot) {
 347                                 end_request(req, 0);
 348                                 continue;
 349                         }
 350                 }
 351
 352                 /* Do not remove the cast. req->sector is now a sector_t and
 353                  * can be 64 bits, but it will never go past 32 bits for this
 354                  * driver anyway, so we can safely cast it down and not have
 355                  * to do a 64/32 division
 356                  */
 357                 fs->req_cyl = ((long)req->sector) / fs->secpercyl;
 358                 x = ((long)req->sector) % fs->secpercyl;
 359                 fs->head = x / fs->secpertrack;
 360                 fs->req_sector = x % fs->secpertrack + 1;
 361                 fd_req = req;
 362                 fs->state = do_transfer;
 363                 fs->retries = 0;
 364
 365                 act(fs);
 366         }
 367 }
 368
 369 static void set_timeout(struct floppy_state *fs, int nticks,
 370                         void (*proc)(unsigned long))
 371 {
 372         unsigned long flags;
 373
 374         spin_lock_irqsave(&fs->lock, flags);
 375         if (fs->timeout_pending)
 376                 del_timer(&fs->timeout);
 377         fs->timeout.expires = jiffies + nticks;
 378         fs->timeout.function = proc;
 379         fs->timeout.data = (unsigned long) fs;
 380         add_timer(&fs->timeout);
 381         fs->timeout_pending = 1;
 382         spin_unlock_irqrestore(&fs->lock, flags);
 383 }
 384
 385 static inline void scan_track(struct floppy_state *fs)
 386 {
 387         struct swim3 __iomem *sw = fs->swim3;
 388
 389         swim3_select(fs, READ_DATA_0);
 390         in_8(&sw->intr);                /* clear SEEN_SECTOR bit */
 391         in_8(&sw->error);
 392         out_8(&sw->intr_enable, SEEN_SECTOR);
 393         out_8(&sw->control_bis, DO_ACTION);
 394         /* enable intr when track found */
 395         set_timeout(fs, HZ, scan_timeout);      /* enable timeout */
 396 }
 397
 398 static inline void seek_track(struct floppy_state *fs, int n)
 399 {
 400         struct swim3 __iomem *sw = fs->swim3;
 401
 402         if (n >= 0) {
 403                 swim3_action(fs, SEEK_POSITIVE);
 404                 sw->nseek = n;
 405         } else {
 406                 swim3_action(fs, SEEK_NEGATIVE);
 407                 sw->nseek = -n;
 408         }
 409         fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
 410         swim3_select(fs, STEP);
 411         in_8(&sw->error);
 412         /* enable intr when seek finished */
 413         out_8(&sw->intr_enable, SEEK_DONE);
 414         out_8(&sw->control_bis, DO_SEEK);
 415         set_timeout(fs, 3*HZ, seek_timeout);    /* enable timeout */
 416         fs->settle_time = 0;
 417 }
 418
 419 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
 420                             void *buf, int count)
 421 {
 422         st_le16(&cp->req_count, count);
 423         st_le16(&cp->command, cmd);
 424         st_le32(&cp->phy_addr, virt_to_bus(buf));
 425         cp->xfer_status = 0;
 426 }
 427
 428 static inline void setup_transfer(struct floppy_state *fs)
 429 {
 430         int n;
 431         struct swim3 __iomem *sw = fs->swim3;
 432         struct dbdma_cmd *cp = fs->dma_cmd;
 433         struct dbdma_regs __iomem *dr = fs->dma;
 434
 435         if (fd_req->current_nr_sectors <= 0) {
 436                 printk(KERN_ERR "swim3: transfer 0 sectors?\n");
 437                 return;
 438         }
 439         if (rq_data_dir(fd_req) == WRITE)
 440                 n = 1;
 441         else {
 442                 n = fs->secpertrack - fs->req_sector + 1;
 443                 if (n > fd_req->current_nr_sectors)
 444                         n = fd_req->current_nr_sectors;
 445         }
 446         fs->scount = n;
 447         swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
 448         out_8(&sw->sector, fs->req_sector);
 449         out_8(&sw->nsect, n);
 450         out_8(&sw->gap3, 0);
 451         out_le32(&dr->cmdptr, virt_to_bus(cp));
 452         if (rq_data_dir(fd_req) == WRITE) {
 453                 /* Set up 3 dma commands: write preamble, data, postamble */
 454                 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
 455                 ++cp;
 456                 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512);
 457                 ++cp;
 458                 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
 459         } else {
 460                 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512);
 461         }
 462         ++cp;
 463         out_le16(&cp->command, DBDMA_STOP);
 464         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 465         in_8(&sw->error);
 466         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 467         if (rq_data_dir(fd_req) == WRITE)
 468                 out_8(&sw->control_bis, WRITE_SECTORS);
 469         in_8(&sw->intr);
 470         out_le32(&dr->control, (RUN << 16) | RUN);
 471         /* enable intr when transfer complete */
 472         out_8(&sw->intr_enable, TRANSFER_DONE);
 473         out_8(&sw->control_bis, DO_ACTION);
 474         set_timeout(fs, 2*HZ, xfer_timeout);    /* enable timeout */
 475 }
 476
 477 static void act(struct floppy_state *fs)
 478 {
 479         for (;;) {
 480                 switch (fs->state) {
 481                 case idle:
 482                         return;         /* XXX shouldn't get here */
 483
 484                 case locating:
 485                         if (swim3_readbit(fs, TRACK_ZERO)) {
 486                                 fs->cur_cyl = 0;
 487                                 if (fs->req_cyl == 0)
 488                                         fs->state = do_transfer;
 489                                 else
 490                                         fs->state = seeking;
 491                                 break;
 492                         }
 493                         scan_track(fs);
 494                         return;
 495
 496                 case seeking:
 497                         if (fs->cur_cyl < 0) {
 498                                 fs->expect_cyl = -1;
 499                                 fs->state = locating;
 500                                 break;
 501                         }
 502                         if (fs->req_cyl == fs->cur_cyl) {
 503                                 printk("whoops, seeking 0\n");
 504                                 fs->state = do_transfer;
 505                                 break;
 506                         }
 507                         seek_track(fs, fs->req_cyl - fs->cur_cyl);
 508                         return;
 509
 510                 case settling:
 511                         /* check for SEEK_COMPLETE after 30ms */
 512                         fs->settle_time = (HZ + 32) / 33;
 513                         set_timeout(fs, fs->settle_time, settle_timeout);
 514                         return;
 515
 516                 case do_transfer:
 517                         if (fs->cur_cyl != fs->req_cyl) {
 518                                 if (fs->retries > 5) {
 519                                         end_request(fd_req, 0);
 520                                         fs->state = idle;
 521                                         return;
 522                                 }
 523                                 fs->state = seeking;
 524                                 break;
 525                         }
 526                         setup_transfer(fs);
 527                         return;
 528
 529                 case jogging:
 530                         seek_track(fs, -5);
 531                         return;
 532
 533                 default:
 534                         printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
 535                         return;
 536                 }
 537         }
 538 }
 539
 540 static void scan_timeout(unsigned long data)
 541 {
 542         struct floppy_state *fs = (struct floppy_state *) data;
 543         struct swim3 __iomem *sw = fs->swim3;
 544
 545         fs->timeout_pending = 0;
 546         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 547         out_8(&sw->select, RELAX);
 548         out_8(&sw->intr_enable, 0);
 549         fs->cur_cyl = -1;
 550         if (fs->retries > 5) {
 551                 end_request(fd_req, 0);
 552                 fs->state = idle;
 553                 start_request(fs);
 554         } else {
 555                 fs->state = jogging;
 556                 act(fs);
 557         }
 558 }
 559
 560 static void seek_timeout(unsigned long data)
 561 {
 562         struct floppy_state *fs = (struct floppy_state *) data;
 563         struct swim3 __iomem *sw = fs->swim3;
 564
 565         fs->timeout_pending = 0;
 566         out_8(&sw->control_bic, DO_SEEK);
 567         out_8(&sw->select, RELAX);
 568         out_8(&sw->intr_enable, 0);
 569         printk(KERN_ERR "swim3: seek timeout\n");
 570         end_request(fd_req, 0);
 571         fs->state = idle;
 572         start_request(fs);
 573 }
 574
 575 static void settle_timeout(unsigned long data)
 576 {
 577         struct floppy_state *fs = (struct floppy_state *) data;
 578         struct swim3 __iomem *sw = fs->swim3;
 579
 580         fs->timeout_pending = 0;
 581         if (swim3_readbit(fs, SEEK_COMPLETE)) {
 582                 out_8(&sw->select, RELAX);
 583                 fs->state = locating;
 584                 act(fs);
 585                 return;
 586         }
 587         out_8(&sw->select, RELAX);
 588         if (fs->settle_time < 2*HZ) {
 589                 ++fs->settle_time;
 590                 set_timeout(fs, 1, settle_timeout);
 591                 return;
 592         }
 593         printk(KERN_ERR "swim3: seek settle timeout\n");
 594         end_request(fd_req, 0);
 595         fs->state = idle;
 596         start_request(fs);
 597 }
 598
 599 static void xfer_timeout(unsigned long data)
 600 {
 601         struct floppy_state *fs = (struct floppy_state *) data;
 602         struct swim3 __iomem *sw = fs->swim3;
 603         struct dbdma_regs __iomem *dr = fs->dma;
 604         struct dbdma_cmd *cp = fs->dma_cmd;
 605         unsigned long s;
 606         int n;
 607
 608         fs->timeout_pending = 0;
 609         out_le32(&dr->control, RUN << 16);
 610         /* We must wait a bit for dbdma to stop */
 611         for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
 612                 udelay(1);
 613         out_8(&sw->intr_enable, 0);
 614         out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 615         out_8(&sw->select, RELAX);
 616         if (rq_data_dir(fd_req) == WRITE)
 617                 ++cp;
 618         if (ld_le16(&cp->xfer_status) != 0)
 619                 s = fs->scount - ((ld_le16(&cp->res_count) + 511) >> 9);
 620         else
 621                 s = 0;
 622         fd_req->sector += s;
 623         fd_req->current_nr_sectors -= s;
 624         printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
 625                (rq_data_dir(fd_req)==WRITE? "writ": "read"), (long)fd_req->sector);
 626         end_request(fd_req, 0);
 627         fs->state = idle;
 628         start_request(fs);
 629 }
 630
 631 static irqreturn_t swim3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 632 {
 633         struct floppy_state *fs = (struct floppy_state *) dev_id;
 634         struct swim3 __iomem *sw = fs->swim3;
 635         int intr, err, n;
 636         int stat, resid;
 637         struct dbdma_regs __iomem *dr;
 638         struct dbdma_cmd *cp;
 639
 640         intr = in_8(&sw->intr);
 641         err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
 642         if ((intr & ERROR_INTR) && fs->state != do_transfer)
 643                 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%lx, intr=%x, err=%x\n",
 644                        fs->state, rq_data_dir(fd_req), intr, err);
 645         switch (fs->state) {
 646         case locating:
 647                 if (intr & SEEN_SECTOR) {
 648                         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 649                         out_8(&sw->select, RELAX);
 650                         out_8(&sw->intr_enable, 0);
 651                         del_timer(&fs->timeout);
 652                         fs->timeout_pending = 0;
 653                         if (sw->ctrack == 0xff) {
 654                                 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
 655                                 fs->cur_cyl = -1;
 656                                 if (fs->retries > 5) {
 657                                         end_request(fd_req, 0);
 658                                         fs->state = idle;
 659                                         start_request(fs);
 660                                 } else {
 661                                         fs->state = jogging;
 662                                         act(fs);
 663                                 }
 664                                 break;
 665                         }
 666                         fs->cur_cyl = sw->ctrack;
 667                         fs->cur_sector = sw->csect;
 668                         if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
 669                                 printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
 670                                        fs->expect_cyl, fs->cur_cyl);
 671                         fs->state = do_transfer;
 672                         act(fs);
 673                 }
 674                 break;
 675         case seeking:
 676         case jogging:
 677                 if (sw->nseek == 0) {
 678                         out_8(&sw->control_bic, DO_SEEK);
 679                         out_8(&sw->select, RELAX);
 680                         out_8(&sw->intr_enable, 0);
 681                         del_timer(&fs->timeout);
 682                         fs->timeout_pending = 0;
 683                         if (fs->state == seeking)
 684                                 ++fs->retries;
 685                         fs->state = settling;
 686                         act(fs);
 687                 }
 688                 break;
 689         case settling:
 690                 out_8(&sw->intr_enable, 0);
 691                 del_timer(&fs->timeout);
 692                 fs->timeout_pending = 0;
 693                 act(fs);
 694                 break;
 695         case do_transfer:
 696                 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
 697                         break;
 698                 out_8(&sw->intr_enable, 0);
 699                 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 700                 out_8(&sw->select, RELAX);
 701                 del_timer(&fs->timeout);
 702                 fs->timeout_pending = 0;
 703                 dr = fs->dma;
 704                 cp = fs->dma_cmd;
 705                 if (rq_data_dir(fd_req) == WRITE)
 706                         ++cp;
 707                 /*
 708                  * Check that the main data transfer has finished.
 709                  * On writing, the swim3 sometimes doesn't use
 710                  * up all the bytes of the postamble, so we can still
 711                  * see DMA active here.  That doesn't matter as long
 712                  * as all the sector data has been transferred.
 713                  */
 714                 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
 715                         /* wait a little while for DMA to complete */
 716                         for (n = 0; n < 100; ++n) {
 717                                 if (cp->xfer_status != 0)
 718                                         break;
 719                                 udelay(1);
 720                                 barrier();
 721                         }
 722                 }
 723                 /* turn off DMA */
 724                 out_le32(&dr->control, (RUN | PAUSE) << 16);
 725                 stat = ld_le16(&cp->xfer_status);
 726                 resid = ld_le16(&cp->res_count);
 727                 if (intr & ERROR_INTR) {
 728                         n = fs->scount - 1 - resid / 512;
 729                         if (n > 0) {
 730                                 fd_req->sector += n;
 731                                 fd_req->current_nr_sectors -= n;
 732                                 fd_req->buffer += n * 512;
 733                                 fs->req_sector += n;
 734                         }
 735                         if (fs->retries < 5) {
 736                                 ++fs->retries;
 737                                 act(fs);
 738                         } else {
 739                                 printk("swim3: error %sing block %ld (err=%x)\n",
 740                                        rq_data_dir(fd_req) == WRITE? "writ": "read",
 741                                        (long)fd_req->sector, err);
 742                                 end_request(fd_req, 0);
 743                                 fs->state = idle;
 744                         }
 745                 } else {
 746                         if ((stat & ACTIVE) == 0 || resid != 0) {
 747                                 /* musta been an error */
 748                                 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
 749                                 printk(KERN_ERR "  state=%d, dir=%lx, intr=%x, err=%x\n",
 750                                        fs->state, rq_data_dir(fd_req), intr, err);
 751                                 end_request(fd_req, 0);
 752                                 fs->state = idle;
 753                                 start_request(fs);
 754                                 break;
 755                         }
 756                         fd_req->sector += fs->scount;
 757                         fd_req->current_nr_sectors -= fs->scount;
 758                         fd_req->buffer += fs->scount * 512;
 759                         if (fd_req->current_nr_sectors <= 0) {
 760                                 end_request(fd_req, 1);
 761                                 fs->state = idle;
 762                         } else {
 763                                 fs->req_sector += fs->scount;
 764                                 if (fs->req_sector > fs->secpertrack) {
 765                                         fs->req_sector -= fs->secpertrack;
 766                                         if (++fs->head > 1) {
 767                                                 fs->head = 0;
 768                                                 ++fs->req_cyl;
 769                                         }
 770                                 }
 771                                 act(fs);
 772                         }
 773                 }
 774                 if (fs->state == idle)
 775                         start_request(fs);
 776                 break;
 777         default:
 778                 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);
 779         }
 780         return IRQ_HANDLED;
 781 }
 782
 783 /*
 784 static void fd_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 785 {
 786 }
 787 */
 788
 789 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 790                       int interruptible)
 791 {
 792         unsigned long flags;
 793
 794         spin_lock_irqsave(&fs->lock, flags);
 795         if (fs->state != idle) {
 796                 ++fs->wanted;
 797                 while (fs->state != available) {
 798                         if (interruptible && signal_pending(current)) {
 799                                 --fs->wanted;
 800                                 spin_unlock_irqrestore(&fs->lock, flags);
 801                                 return -EINTR;
 802                         }
 803                         interruptible_sleep_on(&fs->wait);
 804                 }
 805                 --fs->wanted;
 806         }
 807         fs->state = state;
 808         spin_unlock_irqrestore(&fs->lock, flags);
 809         return 0;
 810 }
 811
 812 static void release_drive(struct floppy_state *fs)
 813 {
 814         unsigned long flags;
 815
 816         spin_lock_irqsave(&fs->lock, flags);
 817         fs->state = idle;
 818         start_request(fs);
 819         spin_unlock_irqrestore(&fs->lock, flags);
 820 }
 821
 822 static int fd_eject(struct floppy_state *fs)
 823 {
 824         int err, n;
 825
 826         err = grab_drive(fs, ejecting, 1);
 827         if (err)
 828                 return err;
 829         swim3_action(fs, EJECT);
 830         for (n = 20; n > 0; --n) {
 831                 if (signal_pending(current)) {
 832                         err = -EINTR;
 833                         break;
 834                 }
 835                 swim3_select(fs, RELAX);
 836                 schedule_timeout_interruptible(1);
 837                 if (swim3_readbit(fs, DISK_IN) == 0)
 838                         break;
 839         }
 840         swim3_select(fs, RELAX);
 841         udelay(150);
 842         fs->ejected = 1;
 843         release_drive(fs);
 844         return err;
 845 }
 846
 847 static struct floppy_struct floppy_type =
 848         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL };    /*  7 1.44MB 3.5"   */
 849
 850 static int floppy_ioctl(struct inode *inode, struct file *filp,
 851                         unsigned int cmd, unsigned long param)
 852 {
 853         struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
 854         int err;
 855
 856         if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
 857                 return -EPERM;
 858
 859 #ifdef CONFIG_PMAC_MEDIABAY
 860         if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
 861                 return -ENXIO;
 862 #endif
 863
 864         switch (cmd) {
 865         case FDEJECT:
 866                 if (fs->ref_count != 1)
 867                         return -EBUSY;
 868                 err = fd_eject(fs);
 869                 return err;
 870         case FDGETPRM:
 871                 if (copy_to_user((void __user *) param, &floppy_type,
 872                                  sizeof(struct floppy_struct)))
 873                         return -EFAULT;
 874                 return 0;
 875         }
 876         return -ENOTTY;
 877 }
 878
 879 static int floppy_open(struct inode *inode, struct file *filp)
 880 {
 881         struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
 882         struct swim3 __iomem *sw = fs->swim3;
 883         int n, err = 0;
 884
 885         if (fs->ref_count == 0) {
 886 #ifdef CONFIG_PMAC_MEDIABAY
 887                 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
 888                         return -ENXIO;
 889 #endif
 890                 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
 891                 out_8(&sw->control_bic, 0xff);
 892                 out_8(&sw->mode, 0x95);
 893                 udelay(10);
 894                 out_8(&sw->intr_enable, 0);
 895                 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
 896                 swim3_action(fs, MOTOR_ON);
 897                 fs->write_prot = -1;
 898                 fs->cur_cyl = -1;
 899                 for (n = 0; n < 2 * HZ; ++n) {
 900                         if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
 901                                 break;
 902                         if (signal_pending(current)) {
 903                                 err = -EINTR;
 904                                 break;
 905                         }
 906                         swim3_select(fs, RELAX);
 907                         schedule_timeout_interruptible(1);
 908                 }
 909                 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
 910                                  || swim3_readbit(fs, DISK_IN) == 0))
 911                         err = -ENXIO;
 912                 swim3_action(fs, SETMFM);
 913                 swim3_select(fs, RELAX);
 914
 915         } else if (fs->ref_count == -1 || filp->f_flags & O_EXCL)
 916                 return -EBUSY;
 917
 918         if (err == 0 && (filp->f_flags & O_NDELAY) == 0
 919             && (filp->f_mode & 3)) {
 920                 check_disk_change(inode->i_bdev);
 921                 if (fs->ejected)
 922                         err = -ENXIO;
 923         }
 924
 925         if (err == 0 && (filp->f_mode & 2)) {
 926                 if (fs->write_prot < 0)
 927                         fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 928                 if (fs->write_prot)
 929                         err = -EROFS;
 930         }
 931
 932         if (err) {
 933                 if (fs->ref_count == 0) {
 934                         swim3_action(fs, MOTOR_OFF);
 935                         out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
 936                         swim3_select(fs, RELAX);
 937                 }
 938                 return err;
 939         }
 940
 941         if (filp->f_flags & O_EXCL)
 942                 fs->ref_count = -1;
 943         else
 944                 ++fs->ref_count;
 945
 946         return 0;
 947 }
 948
 949 static int floppy_release(struct inode *inode, struct file *filp)
 950 {
 951         struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
 952         struct swim3 __iomem *sw = fs->swim3;
 953         if (fs->ref_count > 0 && --fs->ref_count == 0) {
 954                 swim3_action(fs, MOTOR_OFF);
 955                 out_8(&sw->control_bic, 0xff);
 956                 swim3_select(fs, RELAX);
 957         }
 958         return 0;
 959 }
 960
 961 static int floppy_check_change(struct gendisk *disk)
 962 {
 963         struct floppy_state *fs = disk->private_data;
 964         return fs->ejected;
 965 }
 966
 967 static int floppy_revalidate(struct gendisk *disk)
 968 {
 969         struct floppy_state *fs = disk->private_data;
 970         struct swim3 __iomem *sw;
 971         int ret, n;
 972
 973 #ifdef CONFIG_PMAC_MEDIABAY
 974         if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
 975                 return -ENXIO;
 976 #endif
 977
 978         sw = fs->swim3;
 979         grab_drive(fs, revalidating, 0);
 980         out_8(&sw->intr_enable, 0);
 981         out_8(&sw->control_bis, DRIVE_ENABLE);
 982         swim3_action(fs, MOTOR_ON);     /* necessary? */
 983         fs->write_prot = -1;
 984         fs->cur_cyl = -1;
 985         mdelay(1);
 986         for (n = HZ; n > 0; --n) {
 987                 if (swim3_readbit(fs, SEEK_COMPLETE))
 988                         break;
 989                 if (signal_pending(current))
 990                         break;
 991                 swim3_select(fs, RELAX);
 992                 schedule_timeout_interruptible(1);
 993         }
 994         ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
 995                 || swim3_readbit(fs, DISK_IN) == 0;
 996         if (ret)
 997                 swim3_action(fs, MOTOR_OFF);
 998         else {
 999                 fs->ejected = 0;
1000                 swim3_action(fs, SETMFM);
1001         }
1002         swim3_select(fs, RELAX);
1003
1004         release_drive(fs);
1005         return ret;
1006 }
1007
1008 static struct block_device_operations floppy_fops = {
1009         .open           = floppy_open,
1010         .release        = floppy_release,
1011         .ioctl          = floppy_ioctl,
1012         .media_changed  = floppy_check_change,
1013         .revalidate_disk= floppy_revalidate,
1014 };
1015
1016 int swim3_init(void)
1017 {
1018         struct device_node *swim;
1019         int err = -ENOMEM;
1020         int i;
1021
1022         devfs_mk_dir("floppy");
1023
1024         swim = find_devices("floppy");
1025         while (swim && (floppy_count < MAX_FLOPPIES))
1026         {
1027                 swim3_add_device(swim);
1028                 swim = swim->next;
1029         }
1030
1031         swim = find_devices("swim3");
1032         while (swim && (floppy_count < MAX_FLOPPIES))
1033         {
1034                 swim3_add_device(swim);
1035                 swim = swim->next;
1036         }
1037
1038         if (!floppy_count)
1039                 return -ENODEV;
1040
1041         for (i = 0; i < floppy_count; i++) {
1042                 disks[i] = alloc_disk(1);
1043                 if (!disks[i])
1044                         goto out;
1045         }
1046
1047         if (register_blkdev(FLOPPY_MAJOR, "fd")) {
1048                 err = -EBUSY;
1049                 goto out;
1050         }
1051
1052         swim3_queue = blk_init_queue(do_fd_request, &swim3_lock);
1053         if (!swim3_queue) {
1054                 err = -ENOMEM;
1055                 goto out_queue;
1056         }
1057
1058         for (i = 0; i < floppy_count; i++) {
1059                 struct gendisk *disk = disks[i];
1060                 disk->major = FLOPPY_MAJOR;
1061                 disk->first_minor = i;
1062                 disk->fops = &floppy_fops;
1063                 disk->private_data = &floppy_states[i];
1064                 disk->queue = swim3_queue;
1065                 disk->flags |= GENHD_FL_REMOVABLE;
1066                 sprintf(disk->disk_name, "fd%d", i);
1067                 sprintf(disk->devfs_name, "floppy/%d", i);
1068                 set_capacity(disk, 2880);
1069                 add_disk(disk);
1070         }
1071         return 0;
1072
1073 out_queue:
1074         unregister_blkdev(FLOPPY_MAJOR, "fd");
1075 out:
1076         while (i--)
1077                 put_disk(disks[i]);
1078         /* shouldn't we do something with results of swim_add_device()? */
1079         return err;
1080 }
1081
1082 static int swim3_add_device(struct device_node *swim)
1083 {
1084         struct device_node *mediabay;
1085         struct floppy_state *fs = &floppy_states[floppy_count];
1086         struct resource res_reg, res_dma;
1087
1088         if (of_address_to_resource(swim, 0, &res_reg) ||
1089             of_address_to_resource(swim, 1, &res_dma)) {
1090                 printk(KERN_ERR "swim3: Can't get addresses\n");
1091                 return -EINVAL;
1092         }
1093         if (request_mem_region(res_reg.start, res_reg.end - res_reg.start + 1,
1094                                " (reg)") == NULL) {
1095                 printk(KERN_ERR "swim3: Can't request register space\n");
1096                 return -EINVAL;
1097         }
1098         if (request_mem_region(res_dma.start, res_dma.end - res_dma.start + 1,
1099                                " (dma)") == NULL) {
1100                 release_mem_region(res_reg.start,
1101                                    res_reg.end - res_reg.start + 1);
1102                 printk(KERN_ERR "swim3: Can't request DMA space\n");
1103                 return -EINVAL;
1104         }
1105
1106         if (swim->n_intrs < 2) {
1107                 printk(KERN_INFO "swim3: expecting 2 intrs (n_intrs:%d)\n",
1108                        swim->n_intrs);
1109                 release_mem_region(res_reg.start,
1110                                    res_reg.end - res_reg.start + 1);
1111                 release_mem_region(res_dma.start,
1112                                    res_dma.end - res_dma.start + 1);
1113                 return -EINVAL;
1114         }
1115
1116         mediabay = (strcasecmp(swim->parent->type, "media-bay") == 0) ? swim->parent : NULL;
1117         if (mediabay == NULL)
1118                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1119
1120         memset(fs, 0, sizeof(*fs));
1121         spin_lock_init(&fs->lock);
1122         fs->state = idle;
1123         fs->swim3 = (struct swim3 __iomem *)ioremap(res_reg.start, 0x200);
1124         fs->dma = (struct dbdma_regs __iomem *)ioremap(res_dma.start, 0x200);
1125         fs->swim3_intr = swim->intrs[0].line;
1126         fs->dma_intr = swim->intrs[1].line;
1127         fs->cur_cyl = -1;
1128         fs->cur_sector = -1;
1129         fs->secpercyl = 36;
1130         fs->secpertrack = 18;
1131         fs->total_secs = 2880;
1132         fs->media_bay = mediabay;
1133         init_waitqueue_head(&fs->wait);
1134
1135         fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1136         memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1137         st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1138
1139         if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1140                 printk(KERN_ERR "Couldn't get irq %d for SWIM3\n", fs->swim3_intr);
1141                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1142                 return -EBUSY;
1143         }
1144 /*
1145         if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
1146                 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
1147                        fs->dma_intr);
1148                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1149                 return -EBUSY;
1150         }
1151 */
1152
1153         init_timer(&fs->timeout);
1154
1155         printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
1156                 mediabay ? "in media bay" : "");
1157
1158         floppy_count++;
1159
1160         return 0;
1161 }
1162
1163 module_init(swim3_init)
1164
1165 MODULE_LICENSE("GPL");
1166 MODULE_AUTHOR("Paul Mackerras");
1167 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);