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 <asm/io.h>
  28 #include <asm/dbdma.h>
  29 #include <asm/prom.h>
  30 #include <asm/uaccess.h>
  31 #include <asm/mediabay.h>
  32 #include <asm/machdep.h>
  33 #include <asm/pmac_feature.h>
  34
  35 #define MAJOR_NR        FLOPPY_MAJOR
  36 #include <linux/blk.h>
  37 #include <linux/devfs_fs_kernel.h>
  38
  39 static int floppy_blocksizes[2] = {512,512};
  40 static int floppy_sizes[2] = {1440,1440};
  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
 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         volatile struct swim3 *swim3;   /* hardware registers */
 179         struct dbdma_regs *dma; /* DMA controller registers */
 180         int     swim3_intr;     /* interrupt number for SWIM3 */
 181         int     dma_intr;       /* interrupt number for DMA channel */
 182         int     cur_cyl;        /* cylinder head is on, or -1 */
 183         int     cur_sector;     /* last sector we saw go past */
 184         int     req_cyl;        /* the cylinder for the current r/w request */
 185         int     head;           /* head number ditto */
 186         int     req_sector;     /* sector number ditto */
 187         int     scount;         /* # sectors we're transferring at present */
 188         int     retries;
 189         int     secpercyl;      /* disk geometry information */
 190         int     secpertrack;
 191         int     total_secs;
 192         int     write_prot;     /* 1 if write-protected, 0 if not, -1 dunno */
 193         struct dbdma_cmd *dma_cmd;
 194         int     ref_count;
 195         int     expect_cyl;
 196         struct timer_list timeout;
 197         int     timeout_pending;
 198         int     ejected;
 199         wait_queue_head_t wait;
 200         int     wanted;
 201         struct device_node*     media_bay; /* NULL when not in bay */
 202         char    dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
 203 };
 204
 205 static struct floppy_state floppy_states[MAX_FLOPPIES];
 206 static int floppy_count = 0;
 207
 208 static unsigned short write_preamble[] = {
 209         0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */
 210         0, 0, 0, 0, 0, 0,                       /* sync field */
 211         0x99a1, 0x99a1, 0x99a1, 0x99fb,         /* data address mark */
 212         0x990f                                  /* no escape for 512 bytes */
 213 };
 214
 215 static unsigned short write_postamble[] = {
 216         0x9904,                                 /* insert CRC */
 217         0x4e4e, 0x4e4e,
 218         0x9908,                                 /* stop writing */
 219         0, 0, 0, 0, 0, 0
 220 };
 221
 222 static void swim3_select(struct floppy_state *fs, int sel);
 223 static void swim3_action(struct floppy_state *fs, int action);
 224 static int swim3_readbit(struct floppy_state *fs, int bit);
 225 static void do_fd_request(request_queue_t * q);
 226 static void start_request(struct floppy_state *fs);
 227 static void set_timeout(struct floppy_state *fs, int nticks,
 228                         void (*proc)(unsigned long));
 229 static void scan_track(struct floppy_state *fs);
 230 static void seek_track(struct floppy_state *fs, int n);
 231 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count);
 232 static void setup_transfer(struct floppy_state *fs);
 233 static void act(struct floppy_state *fs);
 234 static void scan_timeout(unsigned long data);
 235 static void seek_timeout(unsigned long data);
 236 static void xfer_timeout(unsigned long data);
 237 static void swim3_interrupt(int irq, void *dev_id, struct pt_regs *regs);
 238 /*static void fd_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs);*/
 239 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 240                       int interruptible);
 241 static void release_drive(struct floppy_state *fs);
 242 static int fd_eject(struct floppy_state *fs);
 243 static int floppy_ioctl(struct inode *inode, struct file *filp,
 244                         unsigned int cmd, unsigned long param);
 245 static int floppy_open(struct inode *inode, struct file *filp);
 246 static int floppy_release(struct inode *inode, struct file *filp);
 247 static int floppy_check_change(kdev_t dev);
 248 static int floppy_revalidate(kdev_t dev);
 249 static int swim3_add_device(struct device_node *swims);
 250 int swim3_init(void);
 251
 252 #ifndef CONFIG_PMAC_PBOOK
 253 #define check_media_bay(which, what)    1
 254 #endif
 255
 256 static void swim3_select(struct floppy_state *fs, int sel)
 257 {
 258         volatile struct swim3 *sw = fs->swim3;
 259
 260         out_8(&sw->select, RELAX);
 261         if (sel & 8)
 262                 out_8(&sw->control_bis, SELECT);
 263         else
 264                 out_8(&sw->control_bic, SELECT);
 265         out_8(&sw->select, sel & CA_MASK);
 266 }
 267
 268 static void swim3_action(struct floppy_state *fs, int action)
 269 {
 270         volatile struct swim3 *sw = fs->swim3;
 271
 272         swim3_select(fs, action);
 273         udelay(1);
 274         out_8(&sw->select, sw->select | LSTRB);
 275         udelay(2);
 276         out_8(&sw->select, sw->select & ~LSTRB);
 277         udelay(1);
 278         out_8(&sw->select, RELAX);
 279 }
 280
 281 static int swim3_readbit(struct floppy_state *fs, int bit)
 282 {
 283         volatile struct swim3 *sw = fs->swim3;
 284         int stat;
 285
 286         swim3_select(fs, bit);
 287         udelay(10);
 288         stat = in_8(&sw->status);
 289         out_8(&sw->select, RELAX);
 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                 if (floppy_states[i].media_bay &&
 299                         check_media_bay(floppy_states[i].media_bay, MB_FD))
 300                         continue;
 301                 start_request(&floppy_states[i]);
 302         }
 303         sti();
 304 }
 305
 306 static void start_request(struct floppy_state *fs)
 307 {
 308         unsigned long x;
 309
 310         if (fs->state == idle && fs->wanted) {
 311                 fs->state = available;
 312                 wake_up(&fs->wait);
 313                 return;
 314         }
 315         while (!QUEUE_EMPTY && fs->state == idle) {
 316                 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
 317                         panic(DEVICE_NAME ": request list destroyed");
 318                 if (CURRENT->bh && !buffer_locked(CURRENT->bh))
 319                         panic(DEVICE_NAME ": block not locked");
 320 #if 0
 321                 printk("do_fd_req: dev=%x cmd=%d sec=%ld nr_sec=%ld buf=%p\n",
 322                        kdev_t_to_nr(CURRENT->rq_dev), CURRENT->cmd,
 323                        CURRENT->sector, CURRENT->nr_sectors, CURRENT->buffer);
 324                 printk("           rq_status=%d errors=%d current_nr_sectors=%ld\n",
 325                        CURRENT->rq_status, CURRENT->errors, CURRENT->current_nr_sectors);
 326 #endif
 327
 328                 if (CURRENT->sector < 0 || CURRENT->sector >= fs->total_secs) {
 329                         end_request(0);
 330                         continue;
 331                 }
 332                 if (CURRENT->current_nr_sectors == 0) {
 333                         end_request(1);
 334                         continue;
 335                 }
 336                 if (fs->ejected) {
 337                         end_request(0);
 338                         continue;
 339                 }
 340
 341                 if (CURRENT->cmd == WRITE) {
 342                         if (fs->write_prot < 0)
 343                                 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 344                         if (fs->write_prot) {
 345                                 end_request(0);
 346                                 continue;
 347                         }
 348                 }
 349
 350                 fs->req_cyl = CURRENT->sector / fs->secpercyl;
 351                 x = CURRENT->sector % fs->secpercyl;
 352                 fs->head = x / fs->secpertrack;
 353                 fs->req_sector = x % fs->secpertrack + 1;
 354                 fs->state = do_transfer;
 355                 fs->retries = 0;
 356
 357                 act(fs);
 358         }
 359 }
 360
 361 static void set_timeout(struct floppy_state *fs, int nticks,
 362                         void (*proc)(unsigned long))
 363 {
 364         unsigned long flags;
 365
 366         save_flags(flags); cli();
 367         if (fs->timeout_pending)
 368                 del_timer(&fs->timeout);
 369         fs->timeout.expires = jiffies + nticks;
 370         fs->timeout.function = proc;
 371         fs->timeout.data = (unsigned long) fs;
 372         add_timer(&fs->timeout);
 373         fs->timeout_pending = 1;
 374         restore_flags(flags);
 375 }
 376
 377 static inline void scan_track(struct floppy_state *fs)
 378 {
 379         volatile struct swim3 *sw = fs->swim3;
 380         int xx;
 381
 382         swim3_select(fs, READ_DATA_0);
 383         xx = sw->intr;          /* clear SEEN_SECTOR bit */
 384         out_8(&sw->control_bis, DO_ACTION);
 385         /* enable intr when track found */
 386         out_8(&sw->intr_enable, ERROR_INTR | SEEN_SECTOR);
 387         set_timeout(fs, HZ, scan_timeout);      /* enable timeout */
 388 }
 389
 390 static inline void seek_track(struct floppy_state *fs, int n)
 391 {
 392         volatile struct swim3 *sw = fs->swim3;
 393
 394         if (n >= 0) {
 395                 swim3_action(fs, SEEK_POSITIVE);
 396                 sw->nseek = n;
 397         } else {
 398                 swim3_action(fs, SEEK_NEGATIVE);
 399                 sw->nseek = -n;
 400         }
 401         fs->expect_cyl = (fs->cur_cyl > 0)? fs->cur_cyl + n: -1;
 402         swim3_select(fs, STEP);
 403         out_8(&sw->control_bis, DO_SEEK);
 404         /* enable intr when seek finished */
 405         out_8(&sw->intr_enable, ERROR_INTR | SEEK_DONE);
 406         set_timeout(fs, HZ/2, seek_timeout);    /* enable timeout */
 407 }
 408
 409 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
 410                             void *buf, int count)
 411 {
 412         st_le16(&cp->req_count, count);
 413         st_le16(&cp->command, cmd);
 414         st_le32(&cp->phy_addr, virt_to_bus(buf));
 415         cp->xfer_status = 0;
 416 }
 417
 418 static inline void setup_transfer(struct floppy_state *fs)
 419 {
 420         int n;
 421         volatile struct swim3 *sw = fs->swim3;
 422         struct dbdma_cmd *cp = fs->dma_cmd;
 423         struct dbdma_regs *dr = fs->dma;
 424
 425         if (CURRENT->current_nr_sectors <= 0) {
 426                 printk(KERN_ERR "swim3: transfer 0 sectors?\n");
 427                 return;
 428         }
 429         if (CURRENT->cmd == WRITE)
 430                 n = 1;
 431         else {
 432                 n = fs->secpertrack - fs->req_sector + 1;
 433                 if (n > CURRENT->current_nr_sectors)
 434                         n = CURRENT->current_nr_sectors;
 435         }
 436         fs->scount = n;
 437         swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
 438         out_8(&sw->sector, fs->req_sector);
 439         out_8(&sw->nsect, n);
 440         out_8(&sw->gap3, 0);
 441         st_le32(&dr->cmdptr, virt_to_bus(cp));
 442         if (CURRENT->cmd == WRITE) {
 443                 /* Set up 3 dma commands: write preamble, data, postamble */
 444                 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
 445                 ++cp;
 446                 init_dma(cp, OUTPUT_MORE, CURRENT->buffer, 512);
 447                 ++cp;
 448                 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
 449         } else {
 450                 init_dma(cp, INPUT_LAST, CURRENT->buffer, n * 512);
 451         }
 452         ++cp;
 453         out_le16(&cp->command, DBDMA_STOP);
 454         out_le32(&dr->control, (RUN << 16) | RUN);
 455         out_8(&sw->control_bis,
 456               (CURRENT->cmd == WRITE? WRITE_SECTORS: 0) | DO_ACTION);
 457         /* enable intr when transfer complete */
 458         out_8(&sw->intr_enable, ERROR_INTR | TRANSFER_DONE);
 459         set_timeout(fs, 2*HZ, xfer_timeout);    /* enable timeout */
 460 }
 461
 462 static void act(struct floppy_state *fs)
 463 {
 464         volatile struct swim3 *sw = fs->swim3;
 465
 466         for (;;) {
 467                 switch (fs->state) {
 468                 case idle:
 469                         return;         /* XXX shouldn't get here */
 470
 471                 case locating:
 472                         if (swim3_readbit(fs, TRACK_ZERO)) {
 473                                 fs->cur_cyl = 0;
 474                                 if (fs->req_cyl == 0)
 475                                         fs->state = do_transfer;
 476                                 else
 477                                         fs->state = seeking;
 478                                 break;
 479                         }
 480                         scan_track(fs);
 481                         return;
 482
 483                 case seeking:
 484                         if (fs->cur_cyl < 0) {
 485                                 fs->expect_cyl = -1;
 486                                 fs->state = locating;
 487                                 break;
 488                         }
 489                         if (fs->req_cyl == fs->cur_cyl) {
 490                                 printk("whoops, seeking 0\n");
 491                                 fs->state = do_transfer;
 492                                 break;
 493                         }
 494                         seek_track(fs, fs->req_cyl - fs->cur_cyl);
 495                         return;
 496
 497                 case settling:
 498                         /* wait for SEEK_COMPLETE to become true */
 499                         swim3_select(fs, SEEK_COMPLETE);
 500                         udelay(10);
 501                         out_8(&sw->intr_enable, ERROR_INTR | DATA_CHANGED);
 502                         in_8(&sw->intr);        /* clear DATA_CHANGED */
 503                         if (in_8(&sw->status) & DATA) {
 504                                 /* seek_complete is not yet true */
 505                                 set_timeout(fs, HZ/2, seek_timeout);
 506                                 return;
 507                         }
 508                         out_8(&sw->intr_enable, 0);
 509                         in_8(&sw->intr);
 510                         fs->state = locating;
 511                         break;
 512
 513                 case do_transfer:
 514                         if (fs->cur_cyl != fs->req_cyl) {
 515                                 if (fs->retries > 5) {
 516                                         end_request(0);
 517                                         fs->state = idle;
 518                                         return;
 519                                 }
 520                                 fs->state = seeking;
 521                                 break;
 522                         }
 523                         setup_transfer(fs);
 524                         return;
 525
 526                 case jogging:
 527                         seek_track(fs, -5);
 528                         return;
 529
 530                 default:
 531                         printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
 532                         return;
 533                 }
 534         }
 535 }
 536
 537 static void scan_timeout(unsigned long data)
 538 {
 539         struct floppy_state *fs = (struct floppy_state *) data;
 540         volatile struct swim3 *sw = fs->swim3;
 541
 542         fs->timeout_pending = 0;
 543         out_8(&sw->control_bic, DO_ACTION);
 544         out_8(&sw->select, RELAX);
 545         out_8(&sw->intr_enable, 0);
 546         fs->cur_cyl = -1;
 547         if (fs->retries > 5) {
 548                 end_request(0);
 549                 fs->state = idle;
 550                 start_request(fs);
 551         } else {
 552                 fs->state = jogging;
 553                 act(fs);
 554         }
 555 }
 556
 557 static void seek_timeout(unsigned long data)
 558 {
 559         struct floppy_state *fs = (struct floppy_state *) data;
 560         volatile struct swim3 *sw = fs->swim3;
 561
 562         fs->timeout_pending = 0;
 563         if (fs->state == settling) {
 564                 printk(KERN_ERR "swim3: MSI sel=%x ctrl=%x stat=%x intr=%x ie=%x\n",
 565                        sw->select, sw->control, sw->status, sw->intr, sw->intr_enable);
 566         }
 567         out_8(&sw->control_bic, DO_SEEK);
 568         out_8(&sw->select, RELAX);
 569         out_8(&sw->intr_enable, 0);
 570         if (fs->state == settling && swim3_readbit(fs, SEEK_COMPLETE)) {
 571                 /* printk(KERN_DEBUG "swim3: missed settling interrupt\n"); */
 572                 fs->state = locating;
 573                 act(fs);
 574                 return;
 575         }
 576         printk(KERN_ERR "swim3: seek timeout\n");
 577         end_request(0);
 578         fs->state = idle;
 579         start_request(fs);
 580 }
 581
 582 static void xfer_timeout(unsigned long data)
 583 {
 584         struct floppy_state *fs = (struct floppy_state *) data;
 585         volatile struct swim3 *sw = fs->swim3;
 586         struct dbdma_regs *dr = fs->dma;
 587         struct dbdma_cmd *cp = fs->dma_cmd;
 588         unsigned long s;
 589
 590         fs->timeout_pending = 0;
 591         st_le32(&dr->control, RUN << 16);
 592         out_8(&sw->intr_enable, 0);
 593         out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 594         out_8(&sw->select, RELAX);
 595         if (CURRENT->cmd == WRITE)
 596                 ++cp;
 597         if (ld_le16(&cp->xfer_status) != 0)
 598                 s = fs->scount - ((ld_le16(&cp->res_count) + 511) >> 9);
 599         else
 600                 s = 0;
 601         CURRENT->sector += s;
 602         CURRENT->current_nr_sectors -= s;
 603         printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
 604                (CURRENT->cmd==WRITE? "writ": "read"), CURRENT->sector);
 605         end_request(0);
 606         fs->state = idle;
 607         start_request(fs);
 608 }
 609
 610 static void swim3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 611 {
 612         struct floppy_state *fs = (struct floppy_state *) dev_id;
 613         volatile struct swim3 *sw = fs->swim3;
 614         int intr, err, n;
 615         int stat, resid;
 616         struct dbdma_regs *dr;
 617         struct dbdma_cmd *cp;
 618
 619         err = in_8(&sw->error);
 620         intr = in_8(&sw->intr);
 621 #if 0
 622         printk("swim3 intr state=%d intr=%x err=%x\n", fs->state, intr, err);
 623 #endif
 624         if ((intr & ERROR_INTR) && fs->state != do_transfer)
 625                 printk(KERN_ERR "swim3_interrupt, state=%d, cmd=%x, intr=%x, err=%x\n",
 626                        fs->state, CURRENT->cmd, intr, err);
 627         switch (fs->state) {
 628         case locating:
 629                 if (intr & SEEN_SECTOR) {
 630                         out_8(&sw->control_bic, DO_ACTION);
 631                         out_8(&sw->select, RELAX);
 632                         out_8(&sw->intr_enable, 0);
 633                         del_timer(&fs->timeout);
 634                         fs->timeout_pending = 0;
 635                         if (sw->ctrack == 0xff) {
 636                                 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
 637                                 fs->cur_cyl = -1;
 638                                 if (fs->retries > 5) {
 639                                         end_request(0);
 640                                         fs->state = idle;
 641                                         start_request(fs);
 642                                 } else {
 643                                         fs->state = jogging;
 644                                         act(fs);
 645                                 }
 646                                 break;
 647                         }
 648                         fs->cur_cyl = sw->ctrack;
 649                         fs->cur_sector = sw->csect;
 650                         if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
 651                                 printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
 652                                        fs->expect_cyl, fs->cur_cyl);
 653                         fs->state = do_transfer;
 654                         act(fs);
 655                 }
 656                 break;
 657         case seeking:
 658         case jogging:
 659                 if (sw->nseek == 0) {
 660                         out_8(&sw->control_bic, DO_SEEK);
 661                         out_8(&sw->select, RELAX);
 662                         out_8(&sw->intr_enable, 0);
 663                         del_timer(&fs->timeout);
 664                         fs->timeout_pending = 0;
 665                         if (fs->state == seeking)
 666                                 ++fs->retries;
 667                         fs->state = settling;
 668                         act(fs);
 669                 }
 670                 break;
 671         case settling:
 672                 out_8(&sw->intr_enable, 0);
 673                 del_timer(&fs->timeout);
 674                 fs->timeout_pending = 0;
 675                 act(fs);
 676                 break;
 677         case do_transfer:
 678                 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
 679                         break;
 680                 dr = fs->dma;
 681                 cp = fs->dma_cmd;
 682                 /* We must wait a bit for dbdma to complete */
 683                 for (n=0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
 684                         udelay(10);
 685                 DBDMA_DO_STOP(dr);
 686                 out_8(&sw->intr_enable, 0);
 687                 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 688                 out_8(&sw->select, RELAX);
 689                 del_timer(&fs->timeout);
 690                 fs->timeout_pending = 0;
 691                 if (CURRENT->cmd == WRITE)
 692                         ++cp;
 693                 stat = ld_le16(&cp->xfer_status);
 694                 resid = ld_le16(&cp->res_count);
 695                 if (intr & ERROR_INTR) {
 696                         n = fs->scount - 1 - resid / 512;
 697                         if (n > 0) {
 698                                 CURRENT->sector += n;
 699                                 CURRENT->current_nr_sectors -= n;
 700                                 CURRENT->buffer += n * 512;
 701                                 fs->req_sector += n;
 702                         }
 703                         if (fs->retries < 5) {
 704                                 ++fs->retries;
 705                                 act(fs);
 706                         } else {
 707                                 printk("swim3: error %sing block %ld (err=%x)\n",
 708                                        CURRENT->cmd == WRITE? "writ": "read",
 709                                        CURRENT->sector, err);
 710                                 end_request(0);
 711                                 fs->state = idle;
 712                         }
 713                 } else {
 714                         if ((stat & ACTIVE) == 0 || resid != 0) {
 715                                 /* musta been an error */
 716                                 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
 717                                 printk(KERN_ERR "  state=%d, cmd=%x, intr=%x, err=%x\n",
 718                                        fs->state, CURRENT->cmd, intr, err);
 719                                 end_request(0);
 720                                 fs->state = idle;
 721                                 start_request(fs);
 722                                 break;
 723                         }
 724                         CURRENT->sector += fs->scount;
 725                         CURRENT->current_nr_sectors -= fs->scount;
 726                         CURRENT->buffer += fs->scount * 512;
 727                         if (CURRENT->current_nr_sectors <= 0) {
 728                                 end_request(1);
 729                                 fs->state = idle;
 730                         } else {
 731                                 fs->req_sector += fs->scount;
 732                                 if (fs->req_sector > fs->secpertrack) {
 733                                         fs->req_sector -= fs->secpertrack;
 734                                         if (++fs->head > 1) {
 735                                                 fs->head = 0;
 736                                                 ++fs->req_cyl;
 737                                         }
 738                                 }
 739                                 act(fs);
 740                         }
 741                 }
 742                 if (fs->state == idle)
 743                         start_request(fs);
 744                 break;
 745         default:
 746                 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);
 747         }
 748 }
 749
 750 /*
 751 static void fd_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 752 {
 753 }
 754 */
 755
 756 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 757                       int interruptible)
 758 {
 759         unsigned long flags;
 760
 761         save_flags(flags);
 762         cli();
 763         if (fs->state != idle) {
 764                 ++fs->wanted;
 765                 while (fs->state != available) {
 766                         if (interruptible && signal_pending(current)) {
 767                                 --fs->wanted;
 768                                 restore_flags(flags);
 769                                 return -EINTR;
 770                         }
 771                         interruptible_sleep_on(&fs->wait);
 772                 }
 773                 --fs->wanted;
 774         }
 775         fs->state = state;
 776         restore_flags(flags);
 777         return 0;
 778 }
 779
 780 static void release_drive(struct floppy_state *fs)
 781 {
 782         unsigned long flags;
 783
 784         save_flags(flags);
 785         cli();
 786         fs->state = idle;
 787         start_request(fs);
 788         restore_flags(flags);
 789 }
 790
 791 static int fd_eject(struct floppy_state *fs)
 792 {
 793         int err, n;
 794
 795         err = grab_drive(fs, ejecting, 1);
 796         if (err)
 797                 return err;
 798         swim3_action(fs, EJECT);
 799         for (n = 2*HZ; n > 0; --n) {
 800                 if (swim3_readbit(fs, RELAX))
 801                         break;
 802                 if (signal_pending(current)) {
 803                         err = -EINTR;
 804                         break;
 805                 }
 806                 current->state = TASK_INTERRUPTIBLE;
 807                 schedule_timeout(1);
 808         }
 809         fs->ejected = 1;
 810         release_drive(fs);
 811         return err;
 812 }
 813
 814 static struct floppy_struct floppy_type =
 815         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL };    /*  7 1.44MB 3.5"   */
 816
 817 static int floppy_ioctl(struct inode *inode, struct file *filp,
 818                         unsigned int cmd, unsigned long param)
 819 {
 820         struct floppy_state *fs;
 821         int err;
 822         int devnum = MINOR(inode->i_rdev);
 823
 824         if (devnum >= floppy_count)
 825                 return -ENODEV;
 826
 827         if ((cmd & 0x80) && !suser())
 828                 return -EPERM;
 829
 830         fs = &floppy_states[devnum];
 831
 832         if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
 833                 return -ENXIO;
 834
 835         switch (cmd) {
 836         case FDEJECT:
 837                 if (fs->ref_count != 1)
 838                         return -EBUSY;
 839                 err = fd_eject(fs);
 840                 return err;
 841         case FDGETPRM:
 842                 if (copy_to_user((void *) param, (void *)&floppy_type,
 843                                  sizeof(struct floppy_struct)))
 844                         return -EFAULT;
 845                 return 0;
 846         }
 847         return -ENOTTY;
 848 }
 849
 850 static int floppy_open(struct inode *inode, struct file *filp)
 851 {
 852         struct floppy_state *fs;
 853         volatile struct swim3 *sw;
 854         int n, err;
 855         int devnum = MINOR(inode->i_rdev);
 856
 857         if (devnum >= floppy_count)
 858                 return -ENODEV;
 859         if (filp == 0)
 860                 return -EIO;
 861
 862         fs = &floppy_states[devnum];
 863         sw = fs->swim3;
 864         err = 0;
 865         if (fs->ref_count == 0) {
 866                 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
 867                         return -ENXIO;
 868                 out_8(&sw->mode, 0x95);
 869                 out_8(&sw->control_bic, 0xff);
 870                 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
 871                 udelay(10);
 872                 out_8(&sw->intr_enable, 0);
 873                 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
 874                 swim3_action(fs, MOTOR_ON);
 875                 fs->write_prot = -1;
 876                 fs->cur_cyl = -1;
 877                 for (n = HZ; n > 0; --n) {
 878                         if (swim3_readbit(fs, SEEK_COMPLETE))
 879                                 break;
 880                         if (signal_pending(current)) {
 881                                 err = -EINTR;
 882                                 break;
 883                         }
 884                         current->state = TASK_INTERRUPTIBLE;
 885                         schedule_timeout(1);
 886                 }
 887                 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
 888                                  || swim3_readbit(fs, DISK_IN) == 0))
 889                         err = -ENXIO;
 890                 swim3_action(fs, 9);
 891
 892         } else if (fs->ref_count == -1 || filp->f_flags & O_EXCL)
 893                 return -EBUSY;
 894
 895         if (err == 0 && (filp->f_flags & O_NDELAY) == 0
 896             && (filp->f_mode & 3)) {
 897                 check_disk_change(inode->i_rdev);
 898                 if (fs->ejected)
 899                         err = -ENXIO;
 900         }
 901
 902         if (err == 0 && (filp->f_mode & 2)) {
 903                 if (fs->write_prot < 0)
 904                         fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 905                 if (fs->write_prot)
 906                         err = -EROFS;
 907         }
 908
 909         if (err) {
 910                 if (fs->ref_count == 0) {
 911                         swim3_action(fs, MOTOR_OFF);
 912                         out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
 913                 }
 914                 return err;
 915         }
 916
 917         if (filp->f_flags & O_EXCL)
 918                 fs->ref_count = -1;
 919         else
 920                 ++fs->ref_count;
 921
 922         return 0;
 923 }
 924
 925 static int floppy_release(struct inode *inode, struct file *filp)
 926 {
 927         struct floppy_state *fs;
 928         volatile struct swim3 *sw;
 929         int devnum = MINOR(inode->i_rdev);
 930
 931         if (devnum >= floppy_count)
 932                 return -ENODEV;
 933
 934         fs = &floppy_states[devnum];
 935         sw = fs->swim3;
 936         if (fs->ref_count > 0 && --fs->ref_count == 0) {
 937                 swim3_action(fs, MOTOR_OFF);
 938                 out_8(&sw->control_bic, 0xff);
 939         }
 940         return 0;
 941 }
 942
 943 static int floppy_check_change(kdev_t dev)
 944 {
 945         struct floppy_state *fs;
 946         int devnum = MINOR(dev);
 947
 948         if (MAJOR(dev) != MAJOR_NR || (devnum >= floppy_count))
 949                 return 0;
 950
 951         fs = &floppy_states[devnum];
 952         return fs->ejected;
 953 }
 954
 955 static int floppy_revalidate(kdev_t dev)
 956 {
 957         struct floppy_state *fs;
 958         volatile struct swim3 *sw;
 959         int ret, n;
 960         int devnum = MINOR(dev);
 961
 962         if (MAJOR(dev) != MAJOR_NR || (devnum >= floppy_count))
 963                 return 0;
 964
 965         fs = &floppy_states[devnum];
 966
 967         if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
 968                 return -ENXIO;
 969
 970         sw = fs->swim3;
 971         grab_drive(fs, revalidating, 0);
 972         out_8(&sw->intr_enable, 0);
 973         out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
 974         swim3_action(fs, MOTOR_ON);
 975         fs->write_prot = -1;
 976         fs->cur_cyl = -1;
 977         for (n = HZ; n > 0; --n) {
 978                 if (swim3_readbit(fs, SEEK_COMPLETE))
 979                         break;
 980                 if (signal_pending(current))
 981                         break;
 982                 current->state = TASK_INTERRUPTIBLE;
 983                 schedule_timeout(1);
 984         }
 985         ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
 986                 || swim3_readbit(fs, DISK_IN) == 0;
 987         if (ret)
 988                 swim3_action(fs, MOTOR_OFF);
 989         else {
 990                 fs->ejected = 0;
 991                 swim3_action(fs, 9);
 992         }
 993
 994         release_drive(fs);
 995         return ret;
 996 }
 997
 998 static void floppy_off(unsigned int nr)
 999 {
1000 }
1001
1002 static struct block_device_operations floppy_fops = {
1003         open:                   floppy_open,
1004         release:                floppy_release,
1005         ioctl:                  floppy_ioctl,
1006         check_media_change:     floppy_check_change,
1007         revalidate:             floppy_revalidate,
1008 };
1009
1010 static devfs_handle_t floppy_devfs_handle;
1011
1012 int swim3_init(void)
1013 {
1014         struct device_node *swim;
1015
1016         floppy_devfs_handle = devfs_mk_dir(NULL, "floppy", NULL);
1017
1018         swim = find_devices("floppy");
1019         while (swim && (floppy_count < MAX_FLOPPIES))
1020         {
1021                 swim3_add_device(swim);
1022                 swim = swim->next;
1023         }
1024
1025         swim = find_devices("swim3");
1026         while (swim && (floppy_count < MAX_FLOPPIES))
1027         {
1028                 swim3_add_device(swim);
1029                 swim = swim->next;
1030         }
1031
1032         if (floppy_count > 0)
1033         {
1034                 if (devfs_register_blkdev(MAJOR_NR, "fd", &floppy_fops)) {
1035                         printk(KERN_ERR "Unable to get major %d for floppy\n",
1036                                MAJOR_NR);
1037                         return -EBUSY;
1038                 }
1039                 blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
1040                 blksize_size[MAJOR_NR] = floppy_blocksizes;
1041                 blk_size[MAJOR_NR] = floppy_sizes;
1042         }
1043
1044         return 0;
1045 }
1046
1047 static int swim3_add_device(struct device_node *swim)
1048 {
1049         struct device_node *mediabay;
1050         struct floppy_state *fs = &floppy_states[floppy_count];
1051         char floppy_name[16];
1052         devfs_handle_t floppy_handle;
1053
1054         if (swim->n_addrs < 2)
1055         {
1056                 printk(KERN_INFO "swim3: expecting 2 addrs (n_addrs:%d, n_intrs:%d)\n",
1057                        swim->n_addrs, swim->n_intrs);
1058                 return -EINVAL;
1059         }
1060
1061         if (swim->n_intrs < 2)
1062         {
1063                 printk(KERN_INFO "swim3: expecting 2 intrs (n_addrs:%d, n_intrs:%d)\n",
1064                        swim->n_addrs, swim->n_intrs);
1065                 return -EINVAL;
1066         }
1067
1068         if (!request_OF_resource(swim, 0, NULL)) {
1069                 printk(KERN_INFO "swim3: can't request IO resource !\n");
1070                 return -EINVAL;
1071         }
1072
1073         mediabay = (strcasecmp(swim->parent->type, "media-bay") == 0) ? swim->parent : NULL;
1074         if (mediabay == NULL)
1075                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1076
1077         memset(fs, 0, sizeof(*fs));
1078         fs->state = idle;
1079         fs->swim3 = (volatile struct swim3 *) ioremap(swim->addrs[0].address, 0x200);
1080         fs->dma = (struct dbdma_regs *) ioremap(swim->addrs[1].address, 0x200);
1081         fs->swim3_intr = swim->intrs[0].line;
1082         fs->dma_intr = swim->intrs[1].line;
1083         fs->cur_cyl = -1;
1084         fs->cur_sector = -1;
1085         fs->secpercyl = 36;
1086         fs->secpertrack = 18;
1087         fs->total_secs = 2880;
1088         fs->media_bay = mediabay;
1089         init_waitqueue_head(&fs->wait);
1090
1091         fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1092         memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1093         st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1094
1095         if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1096                 printk(KERN_ERR "Couldn't get irq %d for SWIM3\n", fs->swim3_intr);
1097                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1098                 return -EBUSY;
1099         }
1100 /*
1101         if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
1102                 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
1103                        fs->dma_intr);
1104                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1105                 return -EBUSY;
1106         }
1107 */
1108
1109         init_timer(&fs->timeout);
1110
1111         do_floppy = NULL;
1112
1113         printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
1114                 mediabay ? "in media bay" : "");
1115         sprintf(floppy_name, "%s%d", floppy_devfs_handle ? "" : "floppy",
1116                         floppy_count);
1117         floppy_handle = devfs_register(floppy_devfs_handle, floppy_name,
1118                         DEVFS_FL_DEFAULT, MAJOR_NR, floppy_count,
1119                         S_IFBLK | S_IRUSR | S_IWUSR | S_IRGRP |S_IWGRP,
1120                         &floppy_fops, NULL);
1121
1122         floppy_count++;
1123
1124         return 0;
1125 }