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