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