drivers/block/swim3.c

   1 /*
   2  * Driver for the SWIM3 (Super Woz Integrated Machine 3)
   3  * floppy controller found on Power Macintoshes.
   4  *
   5  * Copyright (C) 1996 Paul Mackerras.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version
  10  * 2 of the License, or (at your option) any later version.
  11  */
  12
  13 /*
  14  * TODO:
  15  * handle 2 drives
  16  * handle GCR disks
  17  */
  18
  19 #include <linux/stddef.h>
  20 #include <linux/kernel.h>
  21 #include <linux/sched.h>
  22 #include <linux/timer.h>
  23 #include <linux/delay.h>
  24 #include <linux/fd.h>
  25 #include <linux/ioctl.h>
  26 #include <linux/blkdev.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/module.h>
  29 #include <linux/spinlock.h>
  30 #include <asm/io.h>
  31 #include <asm/dbdma.h>
  32 #include <asm/prom.h>
  33 #include <asm/uaccess.h>
  34 #include <asm/mediabay.h>
  35 #include <asm/machdep.h>
  36 #include <asm/pmac_feature.h>
  37
  38 static struct request_queue *swim3_queue;
  39 static struct gendisk *disks[2];
  40 static struct request *fd_req;
  41
  42 #define MAX_FLOPPIES    2
  43
  44 enum swim_state {
  45         idle,
  46         locating,
  47         seeking,
  48         settling,
  49         do_transfer,
  50         jogging,
  51         available,
  52         revalidating,
  53         ejecting
  54 };
  55
  56 #define REG(x)  unsigned char x; char x ## _pad[15];
  57
  58 /*
  59  * The names for these registers mostly represent speculation on my part.
  60  * It will be interesting to see how close they are to the names Apple uses.
  61  */
  62 struct swim3 {
  63         REG(data);
  64         REG(timer);             /* counts down at 1MHz */
  65         REG(error);
  66         REG(mode);
  67         REG(select);            /* controls CA0, CA1, CA2 and LSTRB signals */
  68         REG(setup);
  69         REG(control);           /* writing bits clears them */
  70         REG(status);            /* writing bits sets them in control */
  71         REG(intr);
  72         REG(nseek);             /* # tracks to seek */
  73         REG(ctrack);            /* current track number */
  74         REG(csect);             /* current sector number */
  75         REG(gap3);              /* size of gap 3 in track format */
  76         REG(sector);            /* sector # to read or write */
  77         REG(nsect);             /* # sectors to read or write */
  78         REG(intr_enable);
  79 };
  80
  81 #define control_bic     control
  82 #define control_bis     status
  83
  84 /* Bits in select register */
  85 #define CA_MASK         7
  86 #define LSTRB           8
  87
  88 /* Bits in control register */
  89 #define DO_SEEK         0x80
  90 #define FORMAT          0x40
  91 #define SELECT          0x20
  92 #define WRITE_SECTORS   0x10
  93 #define DO_ACTION       0x08
  94 #define DRIVE2_ENABLE   0x04
  95 #define DRIVE_ENABLE    0x02
  96 #define INTR_ENABLE     0x01
  97
  98 /* Bits in status register */
  99 #define FIFO_1BYTE      0x80
 100 #define FIFO_2BYTE      0x40
 101 #define ERROR           0x20
 102 #define DATA            0x08
 103 #define RDDATA          0x04
 104 #define INTR_PENDING    0x02
 105 #define MARK_BYTE       0x01
 106
 107 /* Bits in intr and intr_enable registers */
 108 #define ERROR_INTR      0x20
 109 #define DATA_CHANGED    0x10
 110 #define TRANSFER_DONE   0x08
 111 #define SEEN_SECTOR     0x04
 112 #define SEEK_DONE       0x02
 113 #define TIMER_DONE      0x01
 114
 115 /* Bits in error register */
 116 #define ERR_DATA_CRC    0x80
 117 #define ERR_ADDR_CRC    0x40
 118 #define ERR_OVERRUN     0x04
 119 #define ERR_UNDERRUN    0x01
 120
 121 /* Bits in setup register */
 122 #define S_SW_RESET      0x80
 123 #define S_GCR_WRITE     0x40
 124 #define S_IBM_DRIVE     0x20
 125 #define S_TEST_MODE     0x10
 126 #define S_FCLK_DIV2     0x08
 127 #define S_GCR           0x04
 128 #define S_COPY_PROT     0x02
 129 #define S_INV_WDATA     0x01
 130
 131 /* Select values for swim3_action */
 132 #define SEEK_POSITIVE   0
 133 #define SEEK_NEGATIVE   4
 134 #define STEP            1
 135 #define MOTOR_ON        2
 136 #define MOTOR_OFF       6
 137 #define INDEX           3
 138 #define EJECT           7
 139 #define SETMFM          9
 140 #define SETGCR          13
 141
 142 /* Select values for swim3_select and swim3_readbit */
 143 #define STEP_DIR        0
 144 #define STEPPING        1
 145 #define MOTOR_ON        2
 146 #define RELAX           3       /* also eject in progress */
 147 #define READ_DATA_0     4
 148 #define TWOMEG_DRIVE    5
 149 #define SINGLE_SIDED    6       /* drive or diskette is 4MB type? */
 150 #define DRIVE_PRESENT   7
 151 #define DISK_IN         8
 152 #define WRITE_PROT      9
 153 #define TRACK_ZERO      10
 154 #define TACHO           11
 155 #define READ_DATA_1     12
 156 #define MFM_MODE        13
 157 #define SEEK_COMPLETE   14
 158 #define ONEMEG_MEDIA    15
 159
 160 /* Definitions of values used in writing and formatting */
 161 #define DATA_ESCAPE     0x99
 162 #define GCR_SYNC_EXC    0x3f
 163 #define GCR_SYNC_CONV   0x80
 164 #define GCR_FIRST_MARK  0xd5
 165 #define GCR_SECOND_MARK 0xaa
 166 #define GCR_ADDR_MARK   "\xd5\xaa\x00"
 167 #define GCR_DATA_MARK   "\xd5\xaa\x0b"
 168 #define GCR_SLIP_BYTE   "\x27\xaa"
 169 #define GCR_SELF_SYNC   "\x3f\xbf\x1e\x34\x3c\x3f"
 170
 171 #define DATA_99         "\x99\x99"
 172 #define MFM_ADDR_MARK   "\x99\xa1\x99\xa1\x99\xa1\x99\xfe"
 173 #define MFM_INDEX_MARK  "\x99\xc2\x99\xc2\x99\xc2\x99\xfc"
 174 #define MFM_GAP_LEN     12
 175
 176 struct floppy_state {
 177         enum swim_state state;
 178         spinlock_t lock;
 179         struct swim3 __iomem *swim3;    /* hardware registers */
 180         struct dbdma_regs __iomem *dma; /* DMA controller registers */
 181         int     swim3_intr;     /* interrupt number for SWIM3 */
 182         int     dma_intr;       /* interrupt number for DMA channel */
 183         int     cur_cyl;        /* cylinder head is on, or -1 */
 184         int     cur_sector;     /* last sector we saw go past */
 185         int     req_cyl;        /* the cylinder for the current r/w request */
 186         int     head;           /* head number ditto */
 187         int     req_sector;     /* sector number ditto */
 188         int     scount;         /* # sectors we're transferring at present */
 189         int     retries;
 190         int     settle_time;
 191         int     secpercyl;      /* disk geometry information */
 192         int     secpertrack;
 193         int     total_secs;
 194         int     write_prot;     /* 1 if write-protected, 0 if not, -1 dunno */
 195         struct dbdma_cmd *dma_cmd;
 196         int     ref_count;
 197         int     expect_cyl;
 198         struct timer_list timeout;
 199         int     timeout_pending;
 200         int     ejected;
 201         wait_queue_head_t wait;
 202         int     wanted;
 203         struct device_node*     media_bay; /* NULL when not in bay */
 204         char    dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
 205 };
 206
 207 static struct floppy_state floppy_states[MAX_FLOPPIES];
 208 static int floppy_count = 0;
 209 static DEFINE_SPINLOCK(swim3_lock);
 210
 211 static unsigned short write_preamble[] = {
 212         0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */
 213         0, 0, 0, 0, 0, 0,                       /* sync field */
 214         0x99a1, 0x99a1, 0x99a1, 0x99fb,         /* data address mark */
 215         0x990f                                  /* no escape for 512 bytes */
 216 };
 217
 218 static unsigned short write_postamble[] = {
 219         0x9904,                                 /* insert CRC */
 220         0x4e4e, 0x4e4e,
 221         0x9908,                                 /* stop writing */
 222         0, 0, 0, 0, 0, 0
 223 };
 224
 225 static void swim3_select(struct floppy_state *fs, int sel);
 226 static void swim3_action(struct floppy_state *fs, int action);
 227 static int swim3_readbit(struct floppy_state *fs, int bit);
 228 static void do_fd_request(struct request_queue * 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);
 242 /*static void fd_dma_interrupt(int irq, void *dev_id);*/
 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 block_device *bdev, fmode_t mode,
 248                         unsigned int cmd, unsigned long param);
 249 static int floppy_open(struct block_device *bdev, fmode_t mode);
 250 static int floppy_release(struct gendisk *disk, fmode_t mode);
 251 static int floppy_check_change(struct gendisk *disk);
 252 static int floppy_revalidate(struct gendisk *disk);
 253
 254 static void swim3_select(struct floppy_state *fs, int sel)
 255 {
 256         struct swim3 __iomem *sw = fs->swim3;
 257
 258         out_8(&sw->select, RELAX);
 259         if (sel & 8)
 260                 out_8(&sw->control_bis, SELECT);
 261         else
 262                 out_8(&sw->control_bic, SELECT);
 263         out_8(&sw->select, sel & CA_MASK);
 264 }
 265
 266 static void swim3_action(struct floppy_state *fs, int action)
 267 {
 268         struct swim3 __iomem *sw = fs->swim3;
 269
 270         swim3_select(fs, action);
 271         udelay(1);
 272         out_8(&sw->select, sw->select | LSTRB);
 273         udelay(2);
 274         out_8(&sw->select, sw->select & ~LSTRB);
 275         udelay(1);
 276 }
 277
 278 static int swim3_readbit(struct floppy_state *fs, int bit)
 279 {
 280         struct swim3 __iomem *sw = fs->swim3;
 281         int stat;
 282
 283         swim3_select(fs, bit);
 284         udelay(1);
 285         stat = in_8(&sw->status);
 286         return (stat & DATA) == 0;
 287 }
 288
 289 static void do_fd_request(struct request_queue * q)
 290 {
 291         int i;
 292         for(i=0;i<floppy_count;i++)
 293         {
 294 #ifdef CONFIG_PMAC_MEDIABAY
 295                 if (floppy_states[i].media_bay &&
 296                         check_media_bay(floppy_states[i].media_bay, MB_FD))
 297                         continue;
 298 #endif /* CONFIG_PMAC_MEDIABAY */
 299                 start_request(&floppy_states[i]);
 300         }
 301 }
 302
 303 static void start_request(struct floppy_state *fs)
 304 {
 305         struct request *req;
 306         unsigned long x;
 307
 308         if (fs->state == idle && fs->wanted) {
 309                 fs->state = available;
 310                 wake_up(&fs->wait);
 311                 return;
 312         }
 313         while (fs->state == idle && (req = elv_next_request(swim3_queue))) {
 314 #if 0
 315                 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%ld buf=%p\n",
 316                        req->rq_disk->disk_name, req->cmd,
 317                        (long)req->sector, req->nr_sectors, req->buffer);
 318                 printk("           errors=%d current_nr_sectors=%ld\n",
 319                        req->errors, req->current_nr_sectors);
 320 #endif
 321
 322                 if (req->sector < 0 || req->sector >= fs->total_secs) {
 323                         end_request(req, 0);
 324                         continue;
 325                 }
 326                 if (req->current_nr_sectors == 0) {
 327                         end_request(req, 1);
 328                         continue;
 329                 }
 330                 if (fs->ejected) {
 331                         end_request(req, 0);
 332                         continue;
 333                 }
 334
 335                 if (rq_data_dir(req) == WRITE) {
 336                         if (fs->write_prot < 0)
 337                                 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 338                         if (fs->write_prot) {
 339                                 end_request(req, 0);
 340                                 continue;
 341                         }
 342                 }
 343
 344                 /* Do not remove the cast. req->sector is now a sector_t and
 345                  * can be 64 bits, but it will never go past 32 bits for this
 346                  * driver anyway, so we can safely cast it down and not have
 347                  * to do a 64/32 division
 348                  */
 349                 fs->req_cyl = ((long)req->sector) / fs->secpercyl;
 350                 x = ((long)req->sector) % fs->secpercyl;
 351                 fs->head = x / fs->secpertrack;
 352                 fs->req_sector = x % fs->secpertrack + 1;
 353                 fd_req = req;
 354                 fs->state = do_transfer;
 355                 fs->retries = 0;
 356
 357                 act(fs);
 358         }
 359 }
 360
 361 static void set_timeout(struct floppy_state *fs, int nticks,
 362                         void (*proc)(unsigned long))
 363 {
 364         unsigned long flags;
 365
 366         spin_lock_irqsave(&fs->lock, flags);
 367         if (fs->timeout_pending)
 368                 del_timer(&fs->timeout);
 369         fs->timeout.expires = jiffies + nticks;
 370         fs->timeout.function = proc;
 371         fs->timeout.data = (unsigned long) fs;
 372         add_timer(&fs->timeout);
 373         fs->timeout_pending = 1;
 374         spin_unlock_irqrestore(&fs->lock, flags);
 375 }
 376
 377 static inline void scan_track(struct floppy_state *fs)
 378 {
 379         struct swim3 __iomem *sw = fs->swim3;
 380
 381         swim3_select(fs, READ_DATA_0);
 382         in_8(&sw->intr);                /* clear SEEN_SECTOR bit */
 383         in_8(&sw->error);
 384         out_8(&sw->intr_enable, SEEN_SECTOR);
 385         out_8(&sw->control_bis, DO_ACTION);
 386         /* enable intr when track found */
 387         set_timeout(fs, HZ, scan_timeout);      /* enable timeout */
 388 }
 389
 390 static inline void seek_track(struct floppy_state *fs, int n)
 391 {
 392         struct swim3 __iomem *sw = fs->swim3;
 393
 394         if (n >= 0) {
 395                 swim3_action(fs, SEEK_POSITIVE);
 396                 sw->nseek = n;
 397         } else {
 398                 swim3_action(fs, SEEK_NEGATIVE);
 399                 sw->nseek = -n;
 400         }
 401         fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
 402         swim3_select(fs, STEP);
 403         in_8(&sw->error);
 404         /* enable intr when seek finished */
 405         out_8(&sw->intr_enable, SEEK_DONE);
 406         out_8(&sw->control_bis, DO_SEEK);
 407         set_timeout(fs, 3*HZ, seek_timeout);    /* enable timeout */
 408         fs->settle_time = 0;
 409 }
 410
 411 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
 412                             void *buf, int count)
 413 {
 414         st_le16(&cp->req_count, count);
 415         st_le16(&cp->command, cmd);
 416         st_le32(&cp->phy_addr, virt_to_bus(buf));
 417         cp->xfer_status = 0;
 418 }
 419
 420 static inline void setup_transfer(struct floppy_state *fs)
 421 {
 422         int n;
 423         struct swim3 __iomem *sw = fs->swim3;
 424         struct dbdma_cmd *cp = fs->dma_cmd;
 425         struct dbdma_regs __iomem *dr = fs->dma;
 426
 427         if (fd_req->current_nr_sectors <= 0) {
 428                 printk(KERN_ERR "swim3: transfer 0 sectors?\n");
 429                 return;
 430         }
 431         if (rq_data_dir(fd_req) == WRITE)
 432                 n = 1;
 433         else {
 434                 n = fs->secpertrack - fs->req_sector + 1;
 435                 if (n > fd_req->current_nr_sectors)
 436                         n = fd_req->current_nr_sectors;
 437         }
 438         fs->scount = n;
 439         swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
 440         out_8(&sw->sector, fs->req_sector);
 441         out_8(&sw->nsect, n);
 442         out_8(&sw->gap3, 0);
 443         out_le32(&dr->cmdptr, virt_to_bus(cp));
 444         if (rq_data_dir(fd_req) == WRITE) {
 445                 /* Set up 3 dma commands: write preamble, data, postamble */
 446                 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
 447                 ++cp;
 448                 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512);
 449                 ++cp;
 450                 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
 451         } else {
 452                 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512);
 453         }
 454         ++cp;
 455         out_le16(&cp->command, DBDMA_STOP);
 456         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 457         in_8(&sw->error);
 458         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 459         if (rq_data_dir(fd_req) == WRITE)
 460                 out_8(&sw->control_bis, WRITE_SECTORS);
 461         in_8(&sw->intr);
 462         out_le32(&dr->control, (RUN << 16) | RUN);
 463         /* enable intr when transfer complete */
 464         out_8(&sw->intr_enable, TRANSFER_DONE);
 465         out_8(&sw->control_bis, DO_ACTION);
 466         set_timeout(fs, 2*HZ, xfer_timeout);    /* enable timeout */
 467 }
 468
 469 static void act(struct floppy_state *fs)
 470 {
 471         for (;;) {
 472                 switch (fs->state) {
 473                 case idle:
 474                         return;         /* XXX shouldn't get here */
 475
 476                 case locating:
 477                         if (swim3_readbit(fs, TRACK_ZERO)) {
 478                                 fs->cur_cyl = 0;
 479                                 if (fs->req_cyl == 0)
 480                                         fs->state = do_transfer;
 481                                 else
 482                                         fs->state = seeking;
 483                                 break;
 484                         }
 485                         scan_track(fs);
 486                         return;
 487
 488                 case seeking:
 489                         if (fs->cur_cyl < 0) {
 490                                 fs->expect_cyl = -1;
 491                                 fs->state = locating;
 492                                 break;
 493                         }
 494                         if (fs->req_cyl == fs->cur_cyl) {
 495                                 printk("whoops, seeking 0\n");
 496                                 fs->state = do_transfer;
 497                                 break;
 498                         }
 499                         seek_track(fs, fs->req_cyl - fs->cur_cyl);
 500                         return;
 501
 502                 case settling:
 503                         /* check for SEEK_COMPLETE after 30ms */
 504                         fs->settle_time = (HZ + 32) / 33;
 505                         set_timeout(fs, fs->settle_time, settle_timeout);
 506                         return;
 507
 508                 case do_transfer:
 509                         if (fs->cur_cyl != fs->req_cyl) {
 510                                 if (fs->retries > 5) {
 511                                         end_request(fd_req, 0);
 512                                         fs->state = idle;
 513                                         return;
 514                                 }
 515                                 fs->state = seeking;
 516                                 break;
 517                         }
 518                         setup_transfer(fs);
 519                         return;
 520
 521                 case jogging:
 522                         seek_track(fs, -5);
 523                         return;
 524
 525                 default:
 526                         printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
 527                         return;
 528                 }
 529         }
 530 }
 531
 532 static void scan_timeout(unsigned long data)
 533 {
 534         struct floppy_state *fs = (struct floppy_state *) data;
 535         struct swim3 __iomem *sw = fs->swim3;
 536
 537         fs->timeout_pending = 0;
 538         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 539         out_8(&sw->select, RELAX);
 540         out_8(&sw->intr_enable, 0);
 541         fs->cur_cyl = -1;
 542         if (fs->retries > 5) {
 543                 end_request(fd_req, 0);
 544                 fs->state = idle;
 545                 start_request(fs);
 546         } else {
 547                 fs->state = jogging;
 548                 act(fs);
 549         }
 550 }
 551
 552 static void seek_timeout(unsigned long data)
 553 {
 554         struct floppy_state *fs = (struct floppy_state *) data;
 555         struct swim3 __iomem *sw = fs->swim3;
 556
 557         fs->timeout_pending = 0;
 558         out_8(&sw->control_bic, DO_SEEK);
 559         out_8(&sw->select, RELAX);
 560         out_8(&sw->intr_enable, 0);
 561         printk(KERN_ERR "swim3: seek timeout\n");
 562         end_request(fd_req, 0);
 563         fs->state = idle;
 564         start_request(fs);
 565 }
 566
 567 static void settle_timeout(unsigned long data)
 568 {
 569         struct floppy_state *fs = (struct floppy_state *) data;
 570         struct swim3 __iomem *sw = fs->swim3;
 571
 572         fs->timeout_pending = 0;
 573         if (swim3_readbit(fs, SEEK_COMPLETE)) {
 574                 out_8(&sw->select, RELAX);
 575                 fs->state = locating;
 576                 act(fs);
 577                 return;
 578         }
 579         out_8(&sw->select, RELAX);
 580         if (fs->settle_time < 2*HZ) {
 581                 ++fs->settle_time;
 582                 set_timeout(fs, 1, settle_timeout);
 583                 return;
 584         }
 585         printk(KERN_ERR "swim3: seek settle timeout\n");
 586         end_request(fd_req, 0);
 587         fs->state = idle;
 588         start_request(fs);
 589 }
 590
 591 static void xfer_timeout(unsigned long data)
 592 {
 593         struct floppy_state *fs = (struct floppy_state *) data;
 594         struct swim3 __iomem *sw = fs->swim3;
 595         struct dbdma_regs __iomem *dr = fs->dma;
 596         struct dbdma_cmd *cp = fs->dma_cmd;
 597         unsigned long s;
 598         int n;
 599
 600         fs->timeout_pending = 0;
 601         out_le32(&dr->control, RUN << 16);
 602         /* We must wait a bit for dbdma to stop */
 603         for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
 604                 udelay(1);
 605         out_8(&sw->intr_enable, 0);
 606         out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 607         out_8(&sw->select, RELAX);
 608         if (rq_data_dir(fd_req) == WRITE)
 609                 ++cp;
 610         if (ld_le16(&cp->xfer_status) != 0)
 611                 s = fs->scount - ((ld_le16(&cp->res_count) + 511) >> 9);
 612         else
 613                 s = 0;
 614         fd_req->sector += s;
 615         fd_req->current_nr_sectors -= s;
 616         printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
 617                (rq_data_dir(fd_req)==WRITE? "writ": "read"), (long)fd_req->sector);
 618         end_request(fd_req, 0);
 619         fs->state = idle;
 620         start_request(fs);
 621 }
 622
 623 static irqreturn_t swim3_interrupt(int irq, void *dev_id)
 624 {
 625         struct floppy_state *fs = (struct floppy_state *) dev_id;
 626         struct swim3 __iomem *sw = fs->swim3;
 627         int intr, err, n;
 628         int stat, resid;
 629         struct dbdma_regs __iomem *dr;
 630         struct dbdma_cmd *cp;
 631
 632         intr = in_8(&sw->intr);
 633         err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
 634         if ((intr & ERROR_INTR) && fs->state != do_transfer)
 635                 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%x, intr=%x, err=%x\n",
 636                        fs->state, rq_data_dir(fd_req), intr, err);
 637         switch (fs->state) {
 638         case locating:
 639                 if (intr & SEEN_SECTOR) {
 640                         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 641                         out_8(&sw->select, RELAX);
 642                         out_8(&sw->intr_enable, 0);
 643                         del_timer(&fs->timeout);
 644                         fs->timeout_pending = 0;
 645                         if (sw->ctrack == 0xff) {
 646                                 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
 647                                 fs->cur_cyl = -1;
 648                                 if (fs->retries > 5) {
 649                                         end_request(fd_req, 0);
 650                                         fs->state = idle;
 651                                         start_request(fs);
 652                                 } else {
 653                                         fs->state = jogging;
 654                                         act(fs);
 655                                 }
 656                                 break;
 657                         }
 658                         fs->cur_cyl = sw->ctrack;
 659                         fs->cur_sector = sw->csect;
 660                         if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
 661                                 printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
 662                                        fs->expect_cyl, fs->cur_cyl);
 663                         fs->state = do_transfer;
 664                         act(fs);
 665                 }
 666                 break;
 667         case seeking:
 668         case jogging:
 669                 if (sw->nseek == 0) {
 670                         out_8(&sw->control_bic, DO_SEEK);
 671                         out_8(&sw->select, RELAX);
 672                         out_8(&sw->intr_enable, 0);
 673                         del_timer(&fs->timeout);
 674                         fs->timeout_pending = 0;
 675                         if (fs->state == seeking)
 676                                 ++fs->retries;
 677                         fs->state = settling;
 678                         act(fs);
 679                 }
 680                 break;
 681         case settling:
 682                 out_8(&sw->intr_enable, 0);
 683                 del_timer(&fs->timeout);
 684                 fs->timeout_pending = 0;
 685                 act(fs);
 686                 break;
 687         case do_transfer:
 688                 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
 689                         break;
 690                 out_8(&sw->intr_enable, 0);
 691                 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 692                 out_8(&sw->select, RELAX);
 693                 del_timer(&fs->timeout);
 694                 fs->timeout_pending = 0;
 695                 dr = fs->dma;
 696                 cp = fs->dma_cmd;
 697                 if (rq_data_dir(fd_req) == WRITE)
 698                         ++cp;
 699                 /*
 700                  * Check that the main data transfer has finished.
 701                  * On writing, the swim3 sometimes doesn't use
 702                  * up all the bytes of the postamble, so we can still
 703                  * see DMA active here.  That doesn't matter as long
 704                  * as all the sector data has been transferred.
 705                  */
 706                 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
 707                         /* wait a little while for DMA to complete */
 708                         for (n = 0; n < 100; ++n) {
 709                                 if (cp->xfer_status != 0)
 710                                         break;
 711                                 udelay(1);
 712                                 barrier();
 713                         }
 714                 }
 715                 /* turn off DMA */
 716                 out_le32(&dr->control, (RUN | PAUSE) << 16);
 717                 stat = ld_le16(&cp->xfer_status);
 718                 resid = ld_le16(&cp->res_count);
 719                 if (intr & ERROR_INTR) {
 720                         n = fs->scount - 1 - resid / 512;
 721                         if (n > 0) {
 722                                 fd_req->sector += n;
 723                                 fd_req->current_nr_sectors -= n;
 724                                 fd_req->buffer += n * 512;
 725                                 fs->req_sector += n;
 726                         }
 727                         if (fs->retries < 5) {
 728                                 ++fs->retries;
 729                                 act(fs);
 730                         } else {
 731                                 printk("swim3: error %sing block %ld (err=%x)\n",
 732                                        rq_data_dir(fd_req) == WRITE? "writ": "read",
 733                                        (long)fd_req->sector, err);
 734                                 end_request(fd_req, 0);
 735                                 fs->state = idle;
 736                         }
 737                 } else {
 738                         if ((stat & ACTIVE) == 0 || resid != 0) {
 739                                 /* musta been an error */
 740                                 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
 741                                 printk(KERN_ERR "  state=%d, dir=%x, intr=%x, err=%x\n",
 742                                        fs->state, rq_data_dir(fd_req), intr, err);
 743                                 end_request(fd_req, 0);
 744                                 fs->state = idle;
 745                                 start_request(fs);
 746                                 break;
 747                         }
 748                         fd_req->sector += fs->scount;
 749                         fd_req->current_nr_sectors -= fs->scount;
 750                         fd_req->buffer += fs->scount * 512;
 751                         if (fd_req->current_nr_sectors <= 0) {
 752                                 end_request(fd_req, 1);
 753                                 fs->state = idle;
 754                         } else {
 755                                 fs->req_sector += fs->scount;
 756                                 if (fs->req_sector > fs->secpertrack) {
 757                                         fs->req_sector -= fs->secpertrack;
 758                                         if (++fs->head > 1) {
 759                                                 fs->head = 0;
 760                                                 ++fs->req_cyl;
 761                                         }
 762                                 }
 763                                 act(fs);
 764                         }
 765                 }
 766                 if (fs->state == idle)
 767                         start_request(fs);
 768                 break;
 769         default:
 770                 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);
 771         }
 772         return IRQ_HANDLED;
 773 }
 774
 775 /*
 776 static void fd_dma_interrupt(int irq, void *dev_id)
 777 {
 778 }
 779 */
 780
 781 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 782                       int interruptible)
 783 {
 784         unsigned long flags;
 785
 786         spin_lock_irqsave(&fs->lock, flags);
 787         if (fs->state != idle) {
 788                 ++fs->wanted;
 789                 while (fs->state != available) {
 790                         if (interruptible && signal_pending(current)) {
 791                                 --fs->wanted;
 792                                 spin_unlock_irqrestore(&fs->lock, flags);
 793                                 return -EINTR;
 794                         }
 795                         interruptible_sleep_on(&fs->wait);
 796                 }
 797                 --fs->wanted;
 798         }
 799         fs->state = state;
 800         spin_unlock_irqrestore(&fs->lock, flags);
 801         return 0;
 802 }
 803
 804 static void release_drive(struct floppy_state *fs)
 805 {
 806         unsigned long flags;
 807
 808         spin_lock_irqsave(&fs->lock, flags);
 809         fs->state = idle;
 810         start_request(fs);
 811         spin_unlock_irqrestore(&fs->lock, flags);
 812 }
 813
 814 static int fd_eject(struct floppy_state *fs)
 815 {
 816         int err, n;
 817
 818         err = grab_drive(fs, ejecting, 1);
 819         if (err)
 820                 return err;
 821         swim3_action(fs, EJECT);
 822         for (n = 20; n > 0; --n) {
 823                 if (signal_pending(current)) {
 824                         err = -EINTR;
 825                         break;
 826                 }
 827                 swim3_select(fs, RELAX);
 828                 schedule_timeout_interruptible(1);
 829                 if (swim3_readbit(fs, DISK_IN) == 0)
 830                         break;
 831         }
 832         swim3_select(fs, RELAX);
 833         udelay(150);
 834         fs->ejected = 1;
 835         release_drive(fs);
 836         return err;
 837 }
 838
 839 static struct floppy_struct floppy_type =
 840         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL };    /*  7 1.44MB 3.5"   */
 841
 842 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
 843                         unsigned int cmd, unsigned long param)
 844 {
 845         struct floppy_state *fs = bdev->bd_disk->private_data;
 846         int err;
 847
 848         if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
 849                 return -EPERM;
 850
 851 #ifdef CONFIG_PMAC_MEDIABAY
 852         if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
 853                 return -ENXIO;
 854 #endif
 855
 856         switch (cmd) {
 857         case FDEJECT:
 858                 if (fs->ref_count != 1)
 859                         return -EBUSY;
 860                 err = fd_eject(fs);
 861                 return err;
 862         case FDGETPRM:
 863                 if (copy_to_user((void __user *) param, &floppy_type,
 864                                  sizeof(struct floppy_struct)))
 865                         return -EFAULT;
 866                 return 0;
 867         }
 868         return -ENOTTY;
 869 }
 870
 871 static int floppy_open(struct block_device *bdev, fmode_t mode)
 872 {
 873         struct floppy_state *fs = bdev->bd_disk->private_data;
 874         struct swim3 __iomem *sw = fs->swim3;
 875         int n, err = 0;
 876
 877         if (fs->ref_count == 0) {
 878 #ifdef CONFIG_PMAC_MEDIABAY
 879                 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
 880                         return -ENXIO;
 881 #endif
 882                 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
 883                 out_8(&sw->control_bic, 0xff);
 884                 out_8(&sw->mode, 0x95);
 885                 udelay(10);
 886                 out_8(&sw->intr_enable, 0);
 887                 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
 888                 swim3_action(fs, MOTOR_ON);
 889                 fs->write_prot = -1;
 890                 fs->cur_cyl = -1;
 891                 for (n = 0; n < 2 * HZ; ++n) {
 892                         if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
 893                                 break;
 894                         if (signal_pending(current)) {
 895                                 err = -EINTR;
 896                                 break;
 897                         }
 898                         swim3_select(fs, RELAX);
 899                         schedule_timeout_interruptible(1);
 900                 }
 901                 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
 902                                  || swim3_readbit(fs, DISK_IN) == 0))
 903                         err = -ENXIO;
 904                 swim3_action(fs, SETMFM);
 905                 swim3_select(fs, RELAX);
 906
 907         } else if (fs->ref_count == -1 || mode & FMODE_EXCL)
 908                 return -EBUSY;
 909
 910         if (err == 0 && (mode & FMODE_NDELAY) == 0
 911             && (mode & (FMODE_READ|FMODE_WRITE))) {
 912                 check_disk_change(bdev);
 913                 if (fs->ejected)
 914                         err = -ENXIO;
 915         }
 916
 917         if (err == 0 && (mode & FMODE_WRITE)) {
 918                 if (fs->write_prot < 0)
 919                         fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 920                 if (fs->write_prot)
 921                         err = -EROFS;
 922         }
 923
 924         if (err) {
 925                 if (fs->ref_count == 0) {
 926                         swim3_action(fs, MOTOR_OFF);
 927                         out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
 928                         swim3_select(fs, RELAX);
 929                 }
 930                 return err;
 931         }
 932
 933         if (mode & FMODE_EXCL)
 934                 fs->ref_count = -1;
 935         else
 936                 ++fs->ref_count;
 937
 938         return 0;
 939 }
 940
 941 static int floppy_release(struct gendisk *disk, fmode_t mode)
 942 {
 943         struct floppy_state *fs = disk->private_data;
 944         struct swim3 __iomem *sw = fs->swim3;
 945         if (fs->ref_count > 0 && --fs->ref_count == 0) {
 946                 swim3_action(fs, MOTOR_OFF);
 947                 out_8(&sw->control_bic, 0xff);
 948                 swim3_select(fs, RELAX);
 949         }
 950         return 0;
 951 }
 952
 953 static int floppy_check_change(struct gendisk *disk)
 954 {
 955         struct floppy_state *fs = disk->private_data;
 956         return fs->ejected;
 957 }
 958
 959 static int floppy_revalidate(struct gendisk *disk)
 960 {
 961         struct floppy_state *fs = disk->private_data;
 962         struct swim3 __iomem *sw;
 963         int ret, n;
 964
 965 #ifdef CONFIG_PMAC_MEDIABAY
 966         if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
 967                 return -ENXIO;
 968 #endif
 969
 970         sw = fs->swim3;
 971         grab_drive(fs, revalidating, 0);
 972         out_8(&sw->intr_enable, 0);
 973         out_8(&sw->control_bis, DRIVE_ENABLE);
 974         swim3_action(fs, MOTOR_ON);     /* necessary? */
 975         fs->write_prot = -1;
 976         fs->cur_cyl = -1;
 977         mdelay(1);
 978         for (n = HZ; n > 0; --n) {
 979                 if (swim3_readbit(fs, SEEK_COMPLETE))
 980                         break;
 981                 if (signal_pending(current))
 982                         break;
 983                 swim3_select(fs, RELAX);
 984                 schedule_timeout_interruptible(1);
 985         }
 986         ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
 987                 || swim3_readbit(fs, DISK_IN) == 0;
 988         if (ret)
 989                 swim3_action(fs, MOTOR_OFF);
 990         else {
 991                 fs->ejected = 0;
 992                 swim3_action(fs, SETMFM);
 993         }
 994         swim3_select(fs, RELAX);
 995
 996         release_drive(fs);
 997         return ret;
 998 }
 999
1000 static struct block_device_operations floppy_fops = {
1001         .open           = floppy_open,
1002         .release        = floppy_release,
1003         .locked_ioctl   = floppy_ioctl,
1004         .media_changed  = floppy_check_change,
1005         .revalidate_disk= floppy_revalidate,
1006 };
1007
1008 static int swim3_add_device(struct macio_dev *mdev, int index)
1009 {
1010         struct device_node *swim = mdev->ofdev.node;
1011         struct device_node *mediabay;
1012         struct floppy_state *fs = &floppy_states[index];
1013         int rc = -EBUSY;
1014
1015         /* Check & Request resources */
1016         if (macio_resource_count(mdev) < 2) {
1017                 printk(KERN_WARNING "ifd%d: no address for %s\n",
1018                        index, swim->full_name);
1019                 return -ENXIO;
1020         }
1021         if (macio_irq_count(mdev) < 2) {
1022                 printk(KERN_WARNING "fd%d: no intrs for device %s\n",
1023                         index, swim->full_name);
1024         }
1025         if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
1026                 printk(KERN_ERR "fd%d: can't request mmio resource for %s\n",
1027                        index, swim->full_name);
1028                 return -EBUSY;
1029         }
1030         if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
1031                 printk(KERN_ERR "fd%d: can't request dma resource for %s\n",
1032                        index, swim->full_name);
1033                 macio_release_resource(mdev, 0);
1034                 return -EBUSY;
1035         }
1036         dev_set_drvdata(&mdev->ofdev.dev, fs);
1037
1038         mediabay = (strcasecmp(swim->parent->type, "media-bay") == 0) ?
1039                 swim->parent : NULL;
1040         if (mediabay == NULL)
1041                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1042
1043         memset(fs, 0, sizeof(*fs));
1044         spin_lock_init(&fs->lock);
1045         fs->state = idle;
1046         fs->swim3 = (struct swim3 __iomem *)
1047                 ioremap(macio_resource_start(mdev, 0), 0x200);
1048         if (fs->swim3 == NULL) {
1049                 printk("fd%d: couldn't map registers for %s\n",
1050                        index, swim->full_name);
1051                 rc = -ENOMEM;
1052                 goto out_release;
1053         }
1054         fs->dma = (struct dbdma_regs __iomem *)
1055                 ioremap(macio_resource_start(mdev, 1), 0x200);
1056         if (fs->dma == NULL) {
1057                 printk("fd%d: couldn't map DMA for %s\n",
1058                        index, swim->full_name);
1059                 iounmap(fs->swim3);
1060                 rc = -ENOMEM;
1061                 goto out_release;
1062         }
1063         fs->swim3_intr = macio_irq(mdev, 0);
1064         fs->dma_intr = macio_irq(mdev, 1);;
1065         fs->cur_cyl = -1;
1066         fs->cur_sector = -1;
1067         fs->secpercyl = 36;
1068         fs->secpertrack = 18;
1069         fs->total_secs = 2880;
1070         fs->media_bay = mediabay;
1071         init_waitqueue_head(&fs->wait);
1072
1073         fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1074         memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1075         st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1076
1077         if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1078                 printk(KERN_ERR "fd%d: couldn't request irq %d for %s\n",
1079                        index, fs->swim3_intr, swim->full_name);
1080                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1081                 goto out_unmap;
1082                 return -EBUSY;
1083         }
1084 /*
1085         if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
1086                 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
1087                        fs->dma_intr);
1088                 return -EBUSY;
1089         }
1090 */
1091
1092         init_timer(&fs->timeout);
1093
1094         printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
1095                 mediabay ? "in media bay" : "");
1096
1097         return 0;
1098
1099  out_unmap:
1100         iounmap(fs->dma);
1101         iounmap(fs->swim3);
1102
1103  out_release:
1104         macio_release_resource(mdev, 0);
1105         macio_release_resource(mdev, 1);
1106
1107         return rc;
1108 }
1109
1110 static int __devinit swim3_attach(struct macio_dev *mdev, const struct of_device_id *match)
1111 {
1112         int i, rc;
1113         struct gendisk *disk;
1114
1115         /* Add the drive */
1116         rc = swim3_add_device(mdev, floppy_count);
1117         if (rc)
1118                 return rc;
1119
1120         /* Now create the queue if not there yet */
1121         if (swim3_queue == NULL) {
1122                 /* If we failed, there isn't much we can do as the driver is still
1123                  * too dumb to remove the device, just bail out
1124                  */
1125                 if (register_blkdev(FLOPPY_MAJOR, "fd"))
1126                         return 0;
1127                 swim3_queue = blk_init_queue(do_fd_request, &swim3_lock);
1128                 if (swim3_queue == NULL) {
1129                         unregister_blkdev(FLOPPY_MAJOR, "fd");
1130                         return 0;
1131                 }
1132         }
1133
1134         /* Now register that disk. Same comment about failure handling */
1135         i = floppy_count++;
1136         disk = disks[i] = alloc_disk(1);
1137         if (disk == NULL)
1138                 return 0;
1139
1140         disk->major = FLOPPY_MAJOR;
1141         disk->first_minor = i;
1142         disk->fops = &floppy_fops;
1143         disk->private_data = &floppy_states[i];
1144         disk->queue = swim3_queue;
1145         disk->flags |= GENHD_FL_REMOVABLE;
1146         sprintf(disk->disk_name, "fd%d", i);
1147         set_capacity(disk, 2880);
1148         add_disk(disk);
1149
1150         return 0;
1151 }
1152
1153 static struct of_device_id swim3_match[] =
1154 {
1155         {
1156         .name           = "swim3",
1157         },
1158         {
1159         .compatible     = "ohare-swim3"
1160         },
1161         {
1162         .compatible     = "swim3"
1163         },
1164 };
1165
1166 static struct macio_driver swim3_driver =
1167 {
1168         .name           = "swim3",
1169         .match_table    = swim3_match,
1170         .probe          = swim3_attach,
1171 #if 0
1172         .suspend        = swim3_suspend,
1173         .resume         = swim3_resume,
1174 #endif
1175 };
1176
1177
1178 int swim3_init(void)
1179 {
1180         macio_register_driver(&swim3_driver);
1181         return 0;
1182 }
1183
1184 module_init(swim3_init)
1185
1186 MODULE_LICENSE("GPL");
1187 MODULE_AUTHOR("Paul Mackerras");
1188 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);