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   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/interrupt.h>
  29 #include <linux/module.h>
  30 #include <linux/spinlock.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         spinlock_t lock;
 180         struct swim3 __iomem *swim3;    /* hardware registers */
 181         struct dbdma_regs __iomem *dma; /* DMA controller registers */
 182         int     swim3_intr;     /* interrupt number for SWIM3 */
 183         int     dma_intr;       /* interrupt number for DMA channel */
 184         int     cur_cyl;        /* cylinder head is on, or -1 */
 185         int     cur_sector;     /* last sector we saw go past */
 186         int     req_cyl;        /* the cylinder for the current r/w request */
 187         int     head;           /* head number ditto */
 188         int     req_sector;     /* sector number ditto */
 189         int     scount;         /* # sectors we're transferring at present */
 190         int     retries;
 191         int     settle_time;
 192         int     secpercyl;      /* disk geometry information */
 193         int     secpertrack;
 194         int     total_secs;
 195         int     write_prot;     /* 1 if write-protected, 0 if not, -1 dunno */
 196         struct dbdma_cmd *dma_cmd;
 197         int     ref_count;
 198         int     expect_cyl;
 199         struct timer_list timeout;
 200         int     timeout_pending;
 201         int     ejected;
 202         wait_queue_head_t wait;
 203         int     wanted;
 204         struct device_node*     media_bay; /* NULL when not in bay */
 205         char    dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
 206 };
 207
 208 static struct floppy_state floppy_states[MAX_FLOPPIES];
 209 static int floppy_count = 0;
 210 static DEFINE_SPINLOCK(swim3_lock);
 211
 212 static unsigned short write_preamble[] = {
 213         0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */
 214         0, 0, 0, 0, 0, 0,                       /* sync field */
 215         0x99a1, 0x99a1, 0x99a1, 0x99fb,         /* data address mark */
 216         0x990f                                  /* no escape for 512 bytes */
 217 };
 218
 219 static unsigned short write_postamble[] = {
 220         0x9904,                                 /* insert CRC */
 221         0x4e4e, 0x4e4e,
 222         0x9908,                                 /* stop writing */
 223         0, 0, 0, 0, 0, 0
 224 };
 225
 226 static void swim3_select(struct floppy_state *fs, int sel);
 227 static void swim3_action(struct floppy_state *fs, int action);
 228 static int swim3_readbit(struct floppy_state *fs, int bit);
 229 static void do_fd_request(request_queue_t * q);
 230 static void start_request(struct floppy_state *fs);
 231 static void set_timeout(struct floppy_state *fs, int nticks,
 232                         void (*proc)(unsigned long));
 233 static void scan_track(struct floppy_state *fs);
 234 static void seek_track(struct floppy_state *fs, int n);
 235 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count);
 236 static void setup_transfer(struct floppy_state *fs);
 237 static void act(struct floppy_state *fs);
 238 static void scan_timeout(unsigned long data);
 239 static void seek_timeout(unsigned long data);
 240 static void settle_timeout(unsigned long data);
 241 static void xfer_timeout(unsigned long data);
 242 static irqreturn_t swim3_interrupt(int irq, void *dev_id, struct pt_regs *regs);
 243 /*static void fd_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs);*/
 244 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 245                       int interruptible);
 246 static void release_drive(struct floppy_state *fs);
 247 static int fd_eject(struct floppy_state *fs);
 248 static int floppy_ioctl(struct inode *inode, struct file *filp,
 249                         unsigned int cmd, unsigned long param);
 250 static int floppy_open(struct inode *inode, struct file *filp);
 251 static int floppy_release(struct inode *inode, struct file *filp);
 252 static int floppy_check_change(struct gendisk *disk);
 253 static int floppy_revalidate(struct gendisk *disk);
 254 static int swim3_add_device(struct device_node *swims);
 255 int swim3_init(void);
 256
 257 #ifndef CONFIG_PMAC_MEDIABAY
 258 #define check_media_bay(which, what)    1
 259 #endif
 260
 261 static void swim3_select(struct floppy_state *fs, int sel)
 262 {
 263         struct swim3 __iomem *sw = fs->swim3;
 264
 265         out_8(&sw->select, RELAX);
 266         if (sel & 8)
 267                 out_8(&sw->control_bis, SELECT);
 268         else
 269                 out_8(&sw->control_bic, SELECT);
 270         out_8(&sw->select, sel & CA_MASK);
 271 }
 272
 273 static void swim3_action(struct floppy_state *fs, int action)
 274 {
 275         struct swim3 __iomem *sw = fs->swim3;
 276
 277         swim3_select(fs, action);
 278         udelay(1);
 279         out_8(&sw->select, sw->select | LSTRB);
 280         udelay(2);
 281         out_8(&sw->select, sw->select & ~LSTRB);
 282         udelay(1);
 283 }
 284
 285 static int swim3_readbit(struct floppy_state *fs, int bit)
 286 {
 287         struct swim3 __iomem *sw = fs->swim3;
 288         int stat;
 289
 290         swim3_select(fs, bit);
 291         udelay(1);
 292         stat = in_8(&sw->status);
 293         return (stat & DATA) == 0;
 294 }
 295
 296 static void do_fd_request(request_queue_t * q)
 297 {
 298         int i;
 299         for(i=0;i<floppy_count;i++)
 300         {
 301 #ifdef CONFIG_PMAC_MEDIABAY
 302                 if (floppy_states[i].media_bay &&
 303                         check_media_bay(floppy_states[i].media_bay, MB_FD))
 304                         continue;
 305 #endif /* CONFIG_PMAC_MEDIABAY */
 306                 start_request(&floppy_states[i]);
 307         }
 308 }
 309
 310 static void start_request(struct floppy_state *fs)
 311 {
 312         struct request *req;
 313         unsigned long x;
 314
 315         if (fs->state == idle && fs->wanted) {
 316                 fs->state = available;
 317                 wake_up(&fs->wait);
 318                 return;
 319         }
 320         while (fs->state == idle && (req = elv_next_request(swim3_queue))) {
 321 #if 0
 322                 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%ld buf=%p\n",
 323                        req->rq_disk->disk_name, req->cmd,
 324                        (long)req->sector, req->nr_sectors, req->buffer);
 325                 printk("           rq_status=%d errors=%d current_nr_sectors=%ld\n",
 326                        req->rq_status, req->errors, req->current_nr_sectors);
 327 #endif
 328
 329                 if (req->sector < 0 || req->sector >= fs->total_secs) {
 330                         end_request(req, 0);
 331                         continue;
 332                 }
 333                 if (req->current_nr_sectors == 0) {
 334                         end_request(req, 1);
 335                         continue;
 336                 }
 337                 if (fs->ejected) {
 338                         end_request(req, 0);
 339                         continue;
 340                 }
 341
 342                 if (rq_data_dir(req) == WRITE) {
 343                         if (fs->write_prot < 0)
 344                                 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 345                         if (fs->write_prot) {
 346                                 end_request(req, 0);
 347                                 continue;
 348                         }
 349                 }
 350
 351                 /* Do not remove the cast. req->sector is now a sector_t and
 352                  * can be 64 bits, but it will never go past 32 bits for this
 353                  * driver anyway, so we can safely cast it down and not have
 354                  * to do a 64/32 division
 355                  */
 356                 fs->req_cyl = ((long)req->sector) / fs->secpercyl;
 357                 x = ((long)req->sector) % fs->secpercyl;
 358                 fs->head = x / fs->secpertrack;
 359                 fs->req_sector = x % fs->secpertrack + 1;
 360                 fd_req = req;
 361                 fs->state = do_transfer;
 362                 fs->retries = 0;
 363
 364                 act(fs);
 365         }
 366 }
 367
 368 static void set_timeout(struct floppy_state *fs, int nticks,
 369                         void (*proc)(unsigned long))
 370 {
 371         unsigned long flags;
 372
 373         spin_lock_irqsave(&fs->lock, flags);
 374         if (fs->timeout_pending)
 375                 del_timer(&fs->timeout);
 376         fs->timeout.expires = jiffies + nticks;
 377         fs->timeout.function = proc;
 378         fs->timeout.data = (unsigned long) fs;
 379         add_timer(&fs->timeout);
 380         fs->timeout_pending = 1;
 381         spin_unlock_irqrestore(&fs->lock, flags);
 382 }
 383
 384 static inline void scan_track(struct floppy_state *fs)
 385 {
 386         struct swim3 __iomem *sw = fs->swim3;
 387
 388         swim3_select(fs, READ_DATA_0);
 389         in_8(&sw->intr);                /* clear SEEN_SECTOR bit */
 390         in_8(&sw->error);
 391         out_8(&sw->intr_enable, SEEN_SECTOR);
 392         out_8(&sw->control_bis, DO_ACTION);
 393         /* enable intr when track found */
 394         set_timeout(fs, HZ, scan_timeout);      /* enable timeout */
 395 }
 396
 397 static inline void seek_track(struct floppy_state *fs, int n)
 398 {
 399         struct swim3 __iomem *sw = fs->swim3;
 400
 401         if (n >= 0) {
 402                 swim3_action(fs, SEEK_POSITIVE);
 403                 sw->nseek = n;
 404         } else {
 405                 swim3_action(fs, SEEK_NEGATIVE);
 406                 sw->nseek = -n;
 407         }
 408         fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
 409         swim3_select(fs, STEP);
 410         in_8(&sw->error);
 411         /* enable intr when seek finished */
 412         out_8(&sw->intr_enable, SEEK_DONE);
 413         out_8(&sw->control_bis, DO_SEEK);
 414         set_timeout(fs, 3*HZ, seek_timeout);    /* enable timeout */
 415         fs->settle_time = 0;
 416 }
 417
 418 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
 419                             void *buf, int count)
 420 {
 421         st_le16(&cp->req_count, count);
 422         st_le16(&cp->command, cmd);
 423         st_le32(&cp->phy_addr, virt_to_bus(buf));
 424         cp->xfer_status = 0;
 425 }
 426
 427 static inline void setup_transfer(struct floppy_state *fs)
 428 {
 429         int n;
 430         struct swim3 __iomem *sw = fs->swim3;
 431         struct dbdma_cmd *cp = fs->dma_cmd;
 432         struct dbdma_regs __iomem *dr = fs->dma;
 433
 434         if (fd_req->current_nr_sectors <= 0) {
 435                 printk(KERN_ERR "swim3: transfer 0 sectors?\n");
 436                 return;
 437         }
 438         if (rq_data_dir(fd_req) == WRITE)
 439                 n = 1;
 440         else {
 441                 n = fs->secpertrack - fs->req_sector + 1;
 442                 if (n > fd_req->current_nr_sectors)
 443                         n = fd_req->current_nr_sectors;
 444         }
 445         fs->scount = n;
 446         swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
 447         out_8(&sw->sector, fs->req_sector);
 448         out_8(&sw->nsect, n);
 449         out_8(&sw->gap3, 0);
 450         out_le32(&dr->cmdptr, virt_to_bus(cp));
 451         if (rq_data_dir(fd_req) == WRITE) {
 452                 /* Set up 3 dma commands: write preamble, data, postamble */
 453                 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
 454                 ++cp;
 455                 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512);
 456                 ++cp;
 457                 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
 458         } else {
 459                 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512);
 460         }
 461         ++cp;
 462         out_le16(&cp->command, DBDMA_STOP);
 463         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 464         in_8(&sw->error);
 465         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 466         if (rq_data_dir(fd_req) == WRITE)
 467                 out_8(&sw->control_bis, WRITE_SECTORS);
 468         in_8(&sw->intr);
 469         out_le32(&dr->control, (RUN << 16) | RUN);
 470         /* enable intr when transfer complete */
 471         out_8(&sw->intr_enable, TRANSFER_DONE);
 472         out_8(&sw->control_bis, DO_ACTION);
 473         set_timeout(fs, 2*HZ, xfer_timeout);    /* enable timeout */
 474 }
 475
 476 static void act(struct floppy_state *fs)
 477 {
 478         for (;;) {
 479                 switch (fs->state) {
 480                 case idle:
 481                         return;         /* XXX shouldn't get here */
 482
 483                 case locating:
 484                         if (swim3_readbit(fs, TRACK_ZERO)) {
 485                                 fs->cur_cyl = 0;
 486                                 if (fs->req_cyl == 0)
 487                                         fs->state = do_transfer;
 488                                 else
 489                                         fs->state = seeking;
 490                                 break;
 491                         }
 492                         scan_track(fs);
 493                         return;
 494
 495                 case seeking:
 496                         if (fs->cur_cyl < 0) {
 497                                 fs->expect_cyl = -1;
 498                                 fs->state = locating;
 499                                 break;
 500                         }
 501                         if (fs->req_cyl == fs->cur_cyl) {
 502                                 printk("whoops, seeking 0\n");
 503                                 fs->state = do_transfer;
 504                                 break;
 505                         }
 506                         seek_track(fs, fs->req_cyl - fs->cur_cyl);
 507                         return;
 508
 509                 case settling:
 510                         /* check for SEEK_COMPLETE after 30ms */
 511                         fs->settle_time = (HZ + 32) / 33;
 512                         set_timeout(fs, fs->settle_time, settle_timeout);
 513                         return;
 514
 515                 case do_transfer:
 516                         if (fs->cur_cyl != fs->req_cyl) {
 517                                 if (fs->retries > 5) {
 518                                         end_request(fd_req, 0);
 519                                         fs->state = idle;
 520                                         return;
 521                                 }
 522                                 fs->state = seeking;
 523                                 break;
 524                         }
 525                         setup_transfer(fs);
 526                         return;
 527
 528                 case jogging:
 529                         seek_track(fs, -5);
 530                         return;
 531
 532                 default:
 533                         printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
 534                         return;
 535                 }
 536         }
 537 }
 538
 539 static void scan_timeout(unsigned long data)
 540 {
 541         struct floppy_state *fs = (struct floppy_state *) data;
 542         struct swim3 __iomem *sw = fs->swim3;
 543
 544         fs->timeout_pending = 0;
 545         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 546         out_8(&sw->select, RELAX);
 547         out_8(&sw->intr_enable, 0);
 548         fs->cur_cyl = -1;
 549         if (fs->retries > 5) {
 550                 end_request(fd_req, 0);
 551                 fs->state = idle;
 552                 start_request(fs);
 553         } else {
 554                 fs->state = jogging;
 555                 act(fs);
 556         }
 557 }
 558
 559 static void seek_timeout(unsigned long data)
 560 {
 561         struct floppy_state *fs = (struct floppy_state *) data;
 562         struct swim3 __iomem *sw = fs->swim3;
 563
 564         fs->timeout_pending = 0;
 565         out_8(&sw->control_bic, DO_SEEK);
 566         out_8(&sw->select, RELAX);
 567         out_8(&sw->intr_enable, 0);
 568         printk(KERN_ERR "swim3: seek timeout\n");
 569         end_request(fd_req, 0);
 570         fs->state = idle;
 571         start_request(fs);
 572 }
 573
 574 static void settle_timeout(unsigned long data)
 575 {
 576         struct floppy_state *fs = (struct floppy_state *) data;
 577         struct swim3 __iomem *sw = fs->swim3;
 578
 579         fs->timeout_pending = 0;
 580         if (swim3_readbit(fs, SEEK_COMPLETE)) {
 581                 out_8(&sw->select, RELAX);
 582                 fs->state = locating;
 583                 act(fs);
 584                 return;
 585         }
 586         out_8(&sw->select, RELAX);
 587         if (fs->settle_time < 2*HZ) {
 588                 ++fs->settle_time;
 589                 set_timeout(fs, 1, settle_timeout);
 590                 return;
 591         }
 592         printk(KERN_ERR "swim3: seek settle timeout\n");
 593         end_request(fd_req, 0);
 594         fs->state = idle;
 595         start_request(fs);
 596 }
 597
 598 static void xfer_timeout(unsigned long data)
 599 {
 600         struct floppy_state *fs = (struct floppy_state *) data;
 601         struct swim3 __iomem *sw = fs->swim3;
 602         struct dbdma_regs __iomem *dr = fs->dma;
 603         struct dbdma_cmd *cp = fs->dma_cmd;
 604         unsigned long s;
 605         int n;
 606
 607         fs->timeout_pending = 0;
 608         out_le32(&dr->control, RUN << 16);
 609         /* We must wait a bit for dbdma to stop */
 610         for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
 611                 udelay(1);
 612         out_8(&sw->intr_enable, 0);
 613         out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 614         out_8(&sw->select, RELAX);
 615         if (rq_data_dir(fd_req) == WRITE)
 616                 ++cp;
 617         if (ld_le16(&cp->xfer_status) != 0)
 618                 s = fs->scount - ((ld_le16(&cp->res_count) + 511) >> 9);
 619         else
 620                 s = 0;
 621         fd_req->sector += s;
 622         fd_req->current_nr_sectors -= s;
 623         printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
 624                (rq_data_dir(fd_req)==WRITE? "writ": "read"), (long)fd_req->sector);
 625         end_request(fd_req, 0);
 626         fs->state = idle;
 627         start_request(fs);
 628 }
 629
 630 static irqreturn_t swim3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 631 {
 632         struct floppy_state *fs = (struct floppy_state *) dev_id;
 633         struct swim3 __iomem *sw = fs->swim3;
 634         int intr, err, n;
 635         int stat, resid;
 636         struct dbdma_regs __iomem *dr;
 637         struct dbdma_cmd *cp;
 638
 639         intr = in_8(&sw->intr);
 640         err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
 641         if ((intr & ERROR_INTR) && fs->state != do_transfer)
 642                 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%lx, intr=%x, err=%x\n",
 643                        fs->state, rq_data_dir(fd_req), intr, err);
 644         switch (fs->state) {
 645         case locating:
 646                 if (intr & SEEN_SECTOR) {
 647                         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 648                         out_8(&sw->select, RELAX);
 649                         out_8(&sw->intr_enable, 0);
 650                         del_timer(&fs->timeout);
 651                         fs->timeout_pending = 0;
 652                         if (sw->ctrack == 0xff) {
 653                                 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
 654                                 fs->cur_cyl = -1;
 655                                 if (fs->retries > 5) {
 656                                         end_request(fd_req, 0);
 657                                         fs->state = idle;
 658                                         start_request(fs);
 659                                 } else {
 660                                         fs->state = jogging;
 661                                         act(fs);
 662                                 }
 663                                 break;
 664                         }
 665                         fs->cur_cyl = sw->ctrack;
 666                         fs->cur_sector = sw->csect;
 667                         if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
 668                                 printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
 669                                        fs->expect_cyl, fs->cur_cyl);
 670                         fs->state = do_transfer;
 671                         act(fs);
 672                 }
 673                 break;
 674         case seeking:
 675         case jogging:
 676                 if (sw->nseek == 0) {
 677                         out_8(&sw->control_bic, DO_SEEK);
 678                         out_8(&sw->select, RELAX);
 679                         out_8(&sw->intr_enable, 0);
 680                         del_timer(&fs->timeout);
 681                         fs->timeout_pending = 0;
 682                         if (fs->state == seeking)
 683                                 ++fs->retries;
 684                         fs->state = settling;
 685                         act(fs);
 686                 }
 687                 break;
 688         case settling:
 689                 out_8(&sw->intr_enable, 0);
 690                 del_timer(&fs->timeout);
 691                 fs->timeout_pending = 0;
 692                 act(fs);
 693                 break;
 694         case do_transfer:
 695                 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
 696                         break;
 697                 out_8(&sw->intr_enable, 0);
 698                 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 699                 out_8(&sw->select, RELAX);
 700                 del_timer(&fs->timeout);
 701                 fs->timeout_pending = 0;
 702                 dr = fs->dma;
 703                 cp = fs->dma_cmd;
 704                 if (rq_data_dir(fd_req) == WRITE)
 705                         ++cp;
 706                 /*
 707                  * Check that the main data transfer has finished.
 708                  * On writing, the swim3 sometimes doesn't use
 709                  * up all the bytes of the postamble, so we can still
 710                  * see DMA active here.  That doesn't matter as long
 711                  * as all the sector data has been transferred.
 712                  */
 713                 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
 714                         /* wait a little while for DMA to complete */
 715                         for (n = 0; n < 100; ++n) {
 716                                 if (cp->xfer_status != 0)
 717                                         break;
 718                                 udelay(1);
 719                                 barrier();
 720                         }
 721                 }
 722                 /* turn off DMA */
 723                 out_le32(&dr->control, (RUN | PAUSE) << 16);
 724                 stat = ld_le16(&cp->xfer_status);
 725                 resid = ld_le16(&cp->res_count);
 726                 if (intr & ERROR_INTR) {
 727                         n = fs->scount - 1 - resid / 512;
 728                         if (n > 0) {
 729                                 fd_req->sector += n;
 730                                 fd_req->current_nr_sectors -= n;
 731                                 fd_req->buffer += n * 512;
 732                                 fs->req_sector += n;
 733                         }
 734                         if (fs->retries < 5) {
 735                                 ++fs->retries;
 736                                 act(fs);
 737                         } else {
 738                                 printk("swim3: error %sing block %ld (err=%x)\n",
 739                                        rq_data_dir(fd_req) == WRITE? "writ": "read",
 740                                        (long)fd_req->sector, err);
 741                                 end_request(fd_req, 0);
 742                                 fs->state = idle;
 743                         }
 744                 } else {
 745                         if ((stat & ACTIVE) == 0 || resid != 0) {
 746                                 /* musta been an error */
 747                                 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
 748                                 printk(KERN_ERR "  state=%d, dir=%lx, intr=%x, err=%x\n",
 749                                        fs->state, rq_data_dir(fd_req), intr, err);
 750                                 end_request(fd_req, 0);
 751                                 fs->state = idle;
 752                                 start_request(fs);
 753                                 break;
 754                         }
 755                         fd_req->sector += fs->scount;
 756                         fd_req->current_nr_sectors -= fs->scount;
 757                         fd_req->buffer += fs->scount * 512;
 758                         if (fd_req->current_nr_sectors <= 0) {
 759                                 end_request(fd_req, 1);
 760                                 fs->state = idle;
 761                         } else {
 762                                 fs->req_sector += fs->scount;
 763                                 if (fs->req_sector > fs->secpertrack) {
 764                                         fs->req_sector -= fs->secpertrack;
 765                                         if (++fs->head > 1) {
 766                                                 fs->head = 0;
 767                                                 ++fs->req_cyl;
 768                                         }
 769                                 }
 770                                 act(fs);
 771                         }
 772                 }
 773                 if (fs->state == idle)
 774                         start_request(fs);
 775                 break;
 776         default:
 777                 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);
 778         }
 779         return IRQ_HANDLED;
 780 }
 781
 782 /*
 783 static void fd_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 784 {
 785 }
 786 */
 787
 788 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 789                       int interruptible)
 790 {
 791         unsigned long flags;
 792
 793         spin_lock_irqsave(&fs->lock, flags);
 794         if (fs->state != idle) {
 795                 ++fs->wanted;
 796                 while (fs->state != available) {
 797                         if (interruptible && signal_pending(current)) {
 798                                 --fs->wanted;
 799                                 spin_unlock_irqrestore(&fs->lock, flags);
 800                                 return -EINTR;
 801                         }
 802                         interruptible_sleep_on(&fs->wait);
 803                 }
 804                 --fs->wanted;
 805         }
 806         fs->state = state;
 807         spin_unlock_irqrestore(&fs->lock, flags);
 808         return 0;
 809 }
 810
 811 static void release_drive(struct floppy_state *fs)
 812 {
 813         unsigned long flags;
 814
 815         spin_lock_irqsave(&fs->lock, flags);
 816         fs->state = idle;
 817         start_request(fs);
 818         spin_unlock_irqrestore(&fs->lock, 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                 schedule_timeout_interruptible(1);
 836                 if (swim3_readbit(fs, DISK_IN) == 0)
 837                         break;
 838         }
 839         swim3_select(fs, RELAX);
 840         udelay(150);
 841         fs->ejected = 1;
 842         release_drive(fs);
 843         return err;
 844 }
 845
 846 static struct floppy_struct floppy_type =
 847         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL };    /*  7 1.44MB 3.5"   */
 848
 849 static int floppy_ioctl(struct inode *inode, struct file *filp,
 850                         unsigned int cmd, unsigned long param)
 851 {
 852         struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
 853         int err;
 854
 855         if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
 856                 return -EPERM;
 857
 858 #ifdef CONFIG_PMAC_MEDIABAY
 859         if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
 860                 return -ENXIO;
 861 #endif
 862
 863         switch (cmd) {
 864         case FDEJECT:
 865                 if (fs->ref_count != 1)
 866                         return -EBUSY;
 867                 err = fd_eject(fs);
 868                 return err;
 869         case FDGETPRM:
 870                 if (copy_to_user((void __user *) param, &floppy_type,
 871                                  sizeof(struct floppy_struct)))
 872                         return -EFAULT;
 873                 return 0;
 874         }
 875         return -ENOTTY;
 876 }
 877
 878 static int floppy_open(struct inode *inode, struct file *filp)
 879 {
 880         struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
 881         struct swim3 __iomem *sw = fs->swim3;
 882         int n, err = 0;
 883
 884         if (fs->ref_count == 0) {
 885 #ifdef CONFIG_PMAC_MEDIABAY
 886                 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
 887                         return -ENXIO;
 888 #endif
 889                 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
 890                 out_8(&sw->control_bic, 0xff);
 891                 out_8(&sw->mode, 0x95);
 892                 udelay(10);
 893                 out_8(&sw->intr_enable, 0);
 894                 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
 895                 swim3_action(fs, MOTOR_ON);
 896                 fs->write_prot = -1;
 897                 fs->cur_cyl = -1;
 898                 for (n = 0; n < 2 * HZ; ++n) {
 899                         if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
 900                                 break;
 901                         if (signal_pending(current)) {
 902                                 err = -EINTR;
 903                                 break;
 904                         }
 905                         swim3_select(fs, RELAX);
 906                         schedule_timeout_interruptible(1);
 907                 }
 908                 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
 909                                  || swim3_readbit(fs, DISK_IN) == 0))
 910                         err = -ENXIO;
 911                 swim3_action(fs, SETMFM);
 912                 swim3_select(fs, RELAX);
 913
 914         } else if (fs->ref_count == -1 || filp->f_flags & O_EXCL)
 915                 return -EBUSY;
 916
 917         if (err == 0 && (filp->f_flags & O_NDELAY) == 0
 918             && (filp->f_mode & 3)) {
 919                 check_disk_change(inode->i_bdev);
 920                 if (fs->ejected)
 921                         err = -ENXIO;
 922         }
 923
 924         if (err == 0 && (filp->f_mode & 2)) {
 925                 if (fs->write_prot < 0)
 926                         fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 927                 if (fs->write_prot)
 928                         err = -EROFS;
 929         }
 930
 931         if (err) {
 932                 if (fs->ref_count == 0) {
 933                         swim3_action(fs, MOTOR_OFF);
 934                         out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
 935                         swim3_select(fs, RELAX);
 936                 }
 937                 return err;
 938         }
 939
 940         if (filp->f_flags & O_EXCL)
 941                 fs->ref_count = -1;
 942         else
 943                 ++fs->ref_count;
 944
 945         return 0;
 946 }
 947
 948 static int floppy_release(struct inode *inode, struct file *filp)
 949 {
 950         struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
 951         struct swim3 __iomem *sw = fs->swim3;
 952         if (fs->ref_count > 0 && --fs->ref_count == 0) {
 953                 swim3_action(fs, MOTOR_OFF);
 954                 out_8(&sw->control_bic, 0xff);
 955                 swim3_select(fs, RELAX);
 956         }
 957         return 0;
 958 }
 959
 960 static int floppy_check_change(struct gendisk *disk)
 961 {
 962         struct floppy_state *fs = disk->private_data;
 963         return fs->ejected;
 964 }
 965
 966 static int floppy_revalidate(struct gendisk *disk)
 967 {
 968         struct floppy_state *fs = disk->private_data;
 969         struct swim3 __iomem *sw;
 970         int ret, n;
 971
 972 #ifdef CONFIG_PMAC_MEDIABAY
 973         if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
 974                 return -ENXIO;
 975 #endif
 976
 977         sw = fs->swim3;
 978         grab_drive(fs, revalidating, 0);
 979         out_8(&sw->intr_enable, 0);
 980         out_8(&sw->control_bis, DRIVE_ENABLE);
 981         swim3_action(fs, MOTOR_ON);     /* necessary? */
 982         fs->write_prot = -1;
 983         fs->cur_cyl = -1;
 984         mdelay(1);
 985         for (n = HZ; n > 0; --n) {
 986                 if (swim3_readbit(fs, SEEK_COMPLETE))
 987                         break;
 988                 if (signal_pending(current))
 989                         break;
 990                 swim3_select(fs, RELAX);
 991                 schedule_timeout_interruptible(1);
 992         }
 993         ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
 994                 || swim3_readbit(fs, DISK_IN) == 0;
 995         if (ret)
 996                 swim3_action(fs, MOTOR_OFF);
 997         else {
 998                 fs->ejected = 0;
 999                 swim3_action(fs, SETMFM);
1000         }
1001         swim3_select(fs, RELAX);
1002
1003         release_drive(fs);
1004         return ret;
1005 }
1006
1007 static struct block_device_operations floppy_fops = {
1008         .open           = floppy_open,
1009         .release        = floppy_release,
1010         .ioctl          = floppy_ioctl,
1011         .media_changed  = floppy_check_change,
1012         .revalidate_disk= floppy_revalidate,
1013 };
1014
1015 int swim3_init(void)
1016 {
1017         struct device_node *swim;
1018         int err = -ENOMEM;
1019         int i;
1020
1021         swim = find_devices("floppy");
1022         while (swim && (floppy_count < MAX_FLOPPIES))
1023         {
1024                 swim3_add_device(swim);
1025                 swim = swim->next;
1026         }
1027
1028         swim = find_devices("swim3");
1029         while (swim && (floppy_count < MAX_FLOPPIES))
1030         {
1031                 swim3_add_device(swim);
1032                 swim = swim->next;
1033         }
1034
1035         if (!floppy_count)
1036                 return -ENODEV;
1037
1038         for (i = 0; i < floppy_count; i++) {
1039                 disks[i] = alloc_disk(1);
1040                 if (!disks[i])
1041                         goto out;
1042         }
1043
1044         if (register_blkdev(FLOPPY_MAJOR, "fd")) {
1045                 err = -EBUSY;
1046                 goto out;
1047         }
1048
1049         swim3_queue = blk_init_queue(do_fd_request, &swim3_lock);
1050         if (!swim3_queue) {
1051                 err = -ENOMEM;
1052                 goto out_queue;
1053         }
1054
1055         for (i = 0; i < floppy_count; i++) {
1056                 struct gendisk *disk = disks[i];
1057                 disk->major = FLOPPY_MAJOR;
1058                 disk->first_minor = i;
1059                 disk->fops = &floppy_fops;
1060                 disk->private_data = &floppy_states[i];
1061                 disk->queue = swim3_queue;
1062                 disk->flags |= GENHD_FL_REMOVABLE;
1063                 sprintf(disk->disk_name, "fd%d", i);
1064                 sprintf(disk->devfs_name, "floppy/%d", i);
1065                 set_capacity(disk, 2880);
1066                 add_disk(disk);
1067         }
1068         return 0;
1069
1070 out_queue:
1071         unregister_blkdev(FLOPPY_MAJOR, "fd");
1072 out:
1073         while (i--)
1074                 put_disk(disks[i]);
1075         /* shouldn't we do something with results of swim_add_device()? */
1076         return err;
1077 }
1078
1079 static int swim3_add_device(struct device_node *swim)
1080 {
1081         struct device_node *mediabay;
1082         struct floppy_state *fs = &floppy_states[floppy_count];
1083         struct resource res_reg, res_dma;
1084
1085         if (of_address_to_resource(swim, 0, &res_reg) ||
1086             of_address_to_resource(swim, 1, &res_dma)) {
1087                 printk(KERN_ERR "swim3: Can't get addresses\n");
1088                 return -EINVAL;
1089         }
1090         if (request_mem_region(res_reg.start, res_reg.end - res_reg.start + 1,
1091                                " (reg)") == NULL) {
1092                 printk(KERN_ERR "swim3: Can't request register space\n");
1093                 return -EINVAL;
1094         }
1095         if (request_mem_region(res_dma.start, res_dma.end - res_dma.start + 1,
1096                                " (dma)") == NULL) {
1097                 release_mem_region(res_reg.start,
1098                                    res_reg.end - res_reg.start + 1);
1099                 printk(KERN_ERR "swim3: Can't request DMA space\n");
1100                 return -EINVAL;
1101         }
1102
1103         if (swim->n_intrs < 2) {
1104                 printk(KERN_INFO "swim3: expecting 2 intrs (n_intrs:%d)\n",
1105                        swim->n_intrs);
1106                 release_mem_region(res_reg.start,
1107                                    res_reg.end - res_reg.start + 1);
1108                 release_mem_region(res_dma.start,
1109                                    res_dma.end - res_dma.start + 1);
1110                 return -EINVAL;
1111         }
1112
1113         mediabay = (strcasecmp(swim->parent->type, "media-bay") == 0) ? swim->parent : NULL;
1114         if (mediabay == NULL)
1115                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1116
1117         memset(fs, 0, sizeof(*fs));
1118         spin_lock_init(&fs->lock);
1119         fs->state = idle;
1120         fs->swim3 = (struct swim3 __iomem *)ioremap(res_reg.start, 0x200);
1121         fs->dma = (struct dbdma_regs __iomem *)ioremap(res_dma.start, 0x200);
1122         fs->swim3_intr = swim->intrs[0].line;
1123         fs->dma_intr = swim->intrs[1].line;
1124         fs->cur_cyl = -1;
1125         fs->cur_sector = -1;
1126         fs->secpercyl = 36;
1127         fs->secpertrack = 18;
1128         fs->total_secs = 2880;
1129         fs->media_bay = mediabay;
1130         init_waitqueue_head(&fs->wait);
1131
1132         fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1133         memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1134         st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1135
1136         if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1137                 printk(KERN_ERR "Couldn't get irq %d for SWIM3\n", fs->swim3_intr);
1138                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1139                 return -EBUSY;
1140         }
1141 /*
1142         if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
1143                 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
1144                        fs->dma_intr);
1145                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1146                 return -EBUSY;
1147         }
1148 */
1149
1150         init_timer(&fs->timeout);
1151
1152         printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
1153                 mediabay ? "in media bay" : "");
1154
1155         floppy_count++;
1156
1157         return 0;
1158 }
1159
1160 module_init(swim3_init)
1161
1162 MODULE_LICENSE("GPL");
1163 MODULE_AUTHOR("Paul Mackerras");
1164 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);