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 #undef DEBUG 20 21 #include <linux/stddef.h> 22 #include <linux/kernel.h> 23 #include <linux/sched.h> 24 #include <linux/timer.h> 25 #include <linux/delay.h> 26 #include <linux/fd.h> 27 #include <linux/ioctl.h> 28 #include <linux/blkdev.h> 29 #include <linux/interrupt.h> 30 #include <linux/mutex.h> 31 #include <linux/module.h> 32 #include <linux/spinlock.h> 33 #include <linux/wait.h> 34 #include <asm/io.h> 35 #include <asm/dbdma.h> 36 #include <asm/prom.h> 37 #include <asm/uaccess.h> 38 #include <asm/mediabay.h> 39 #include <asm/machdep.h> 40 #include <asm/pmac_feature.h> 41 42 #define MAX_FLOPPIES 2 43 44 static DEFINE_MUTEX(swim3_mutex); 45 static struct gendisk *disks[MAX_FLOPPIES]; 46 47 enum swim_state { 48 idle, 49 locating, 50 seeking, 51 settling, 52 do_transfer, 53 jogging, 54 available, 55 revalidating, 56 ejecting 57 }; 58 59 #define REG(x) unsigned char x; char x ## _pad[15]; 60 61 /* 62 * The names for these registers mostly represent speculation on my part. 63 * It will be interesting to see how close they are to the names Apple uses. 64 */ 65 struct swim3 { 66 REG(data); 67 REG(timer); /* counts down at 1MHz */ 68 REG(error); 69 REG(mode); 70 REG(select); /* controls CA0, CA1, CA2 and LSTRB signals */ 71 REG(setup); 72 REG(control); /* writing bits clears them */ 73 REG(status); /* writing bits sets them in control */ 74 REG(intr); 75 REG(nseek); /* # tracks to seek */ 76 REG(ctrack); /* current track number */ 77 REG(csect); /* current sector number */ 78 REG(gap3); /* size of gap 3 in track format */ 79 REG(sector); /* sector # to read or write */ 80 REG(nsect); /* # sectors to read or write */ 81 REG(intr_enable); 82 }; 83 84 #define control_bic control 85 #define control_bis status 86 87 /* Bits in select register */ 88 #define CA_MASK 7 89 #define LSTRB 8 90 91 /* Bits in control register */ 92 #define DO_SEEK 0x80 93 #define FORMAT 0x40 94 #define SELECT 0x20 95 #define WRITE_SECTORS 0x10 96 #define DO_ACTION 0x08 97 #define DRIVE2_ENABLE 0x04 98 #define DRIVE_ENABLE 0x02 99 #define INTR_ENABLE 0x01 100 101 /* Bits in status register */ 102 #define FIFO_1BYTE 0x80 103 #define FIFO_2BYTE 0x40 104 #define ERROR 0x20 105 #define DATA 0x08 106 #define RDDATA 0x04 107 #define INTR_PENDING 0x02 108 #define MARK_BYTE 0x01 109 110 /* Bits in intr and intr_enable registers */ 111 #define ERROR_INTR 0x20 112 #define DATA_CHANGED 0x10 113 #define TRANSFER_DONE 0x08 114 #define SEEN_SECTOR 0x04 115 #define SEEK_DONE 0x02 116 #define TIMER_DONE 0x01 117 118 /* Bits in error register */ 119 #define ERR_DATA_CRC 0x80 120 #define ERR_ADDR_CRC 0x40 121 #define ERR_OVERRUN 0x04 122 #define ERR_UNDERRUN 0x01 123 124 /* Bits in setup register */ 125 #define S_SW_RESET 0x80 126 #define S_GCR_WRITE 0x40 127 #define S_IBM_DRIVE 0x20 128 #define S_TEST_MODE 0x10 129 #define S_FCLK_DIV2 0x08 130 #define S_GCR 0x04 131 #define S_COPY_PROT 0x02 132 #define S_INV_WDATA 0x01 133 134 /* Select values for swim3_action */ 135 #define SEEK_POSITIVE 0 136 #define SEEK_NEGATIVE 4 137 #define STEP 1 138 #define MOTOR_ON 2 139 #define MOTOR_OFF 6 140 #define INDEX 3 141 #define EJECT 7 142 #define SETMFM 9 143 #define SETGCR 13 144 145 /* Select values for swim3_select and swim3_readbit */ 146 #define STEP_DIR 0 147 #define STEPPING 1 148 #define MOTOR_ON 2 149 #define RELAX 3 /* also eject in progress */ 150 #define READ_DATA_0 4 151 #define TWOMEG_DRIVE 5 152 #define SINGLE_SIDED 6 /* drive or diskette is 4MB type? */ 153 #define DRIVE_PRESENT 7 154 #define DISK_IN 8 155 #define WRITE_PROT 9 156 #define TRACK_ZERO 10 157 #define TACHO 11 158 #define READ_DATA_1 12 159 #define MFM_MODE 13 160 #define SEEK_COMPLETE 14 161 #define ONEMEG_MEDIA 15 162 163 /* Definitions of values used in writing and formatting */ 164 #define DATA_ESCAPE 0x99 165 #define GCR_SYNC_EXC 0x3f 166 #define GCR_SYNC_CONV 0x80 167 #define GCR_FIRST_MARK 0xd5 168 #define GCR_SECOND_MARK 0xaa 169 #define GCR_ADDR_MARK "\xd5\xaa\x00" 170 #define GCR_DATA_MARK "\xd5\xaa\x0b" 171 #define GCR_SLIP_BYTE "\x27\xaa" 172 #define GCR_SELF_SYNC "\x3f\xbf\x1e\x34\x3c\x3f" 173 174 #define DATA_99 "\x99\x99" 175 #define MFM_ADDR_MARK "\x99\xa1\x99\xa1\x99\xa1\x99\xfe" 176 #define MFM_INDEX_MARK "\x99\xc2\x99\xc2\x99\xc2\x99\xfc" 177 #define MFM_GAP_LEN 12 178 179 struct floppy_state { 180 enum swim_state state; 181 struct swim3 __iomem *swim3; /* hardware registers */ 182 struct dbdma_regs __iomem *dma; /* DMA controller registers */ 183 int swim3_intr; /* interrupt number for SWIM3 */ 184 int dma_intr; /* interrupt number for DMA channel */ 185 int cur_cyl; /* cylinder head is on, or -1 */ 186 int cur_sector; /* last sector we saw go past */ 187 int req_cyl; /* the cylinder for the current r/w request */ 188 int head; /* head number ditto */ 189 int req_sector; /* sector number ditto */ 190 int scount; /* # sectors we're transferring at present */ 191 int retries; 192 int settle_time; 193 int secpercyl; /* disk geometry information */ 194 int secpertrack; 195 int total_secs; 196 int write_prot; /* 1 if write-protected, 0 if not, -1 dunno */ 197 struct dbdma_cmd *dma_cmd; 198 int ref_count; 199 int expect_cyl; 200 struct timer_list timeout; 201 int timeout_pending; 202 int ejected; 203 wait_queue_head_t wait; 204 int wanted; 205 struct macio_dev *mdev; 206 char dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)]; 207 int index; 208 struct request *cur_req; 209 }; 210 211 #define swim3_err(fmt, arg...) dev_err(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) 212 #define swim3_warn(fmt, arg...) dev_warn(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) 213 #define swim3_info(fmt, arg...) dev_info(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) 214 215 #ifdef DEBUG 216 #define swim3_dbg(fmt, arg...) dev_dbg(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) 217 #else 218 #define swim3_dbg(fmt, arg...) do { } while(0) 219 #endif 220 221 static struct floppy_state floppy_states[MAX_FLOPPIES]; 222 static int floppy_count = 0; 223 static DEFINE_SPINLOCK(swim3_lock); 224 225 static unsigned short write_preamble[] = { 226 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */ 227 0, 0, 0, 0, 0, 0, /* sync field */ 228 0x99a1, 0x99a1, 0x99a1, 0x99fb, /* data address mark */ 229 0x990f /* no escape for 512 bytes */ 230 }; 231 232 static unsigned short write_postamble[] = { 233 0x9904, /* insert CRC */ 234 0x4e4e, 0x4e4e, 235 0x9908, /* stop writing */ 236 0, 0, 0, 0, 0, 0 237 }; 238 239 static void seek_track(struct floppy_state *fs, int n); 240 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count); 241 static void act(struct floppy_state *fs); 242 static void scan_timeout(unsigned long data); 243 static void seek_timeout(unsigned long data); 244 static void settle_timeout(unsigned long data); 245 static void xfer_timeout(unsigned long data); 246 static irqreturn_t swim3_interrupt(int irq, void *dev_id); 247 /*static void fd_dma_interrupt(int irq, void *dev_id);*/ 248 static int grab_drive(struct floppy_state *fs, enum swim_state state, 249 int interruptible); 250 static void release_drive(struct floppy_state *fs); 251 static int fd_eject(struct floppy_state *fs); 252 static int floppy_ioctl(struct block_device *bdev, fmode_t mode, 253 unsigned int cmd, unsigned long param); 254 static int floppy_open(struct block_device *bdev, fmode_t mode); 255 static void floppy_release(struct gendisk *disk, fmode_t mode); 256 static unsigned int floppy_check_events(struct gendisk *disk, 257 unsigned int clearing); 258 static int floppy_revalidate(struct gendisk *disk); 259 260 static bool swim3_end_request(struct floppy_state *fs, int err, unsigned int nr_bytes) 261 { 262 struct request *req = fs->cur_req; 263 int rc; 264 265 swim3_dbg(" end request, err=%d nr_bytes=%d, cur_req=%p\n", 266 err, nr_bytes, req); 267 268 if (err) 269 nr_bytes = blk_rq_cur_bytes(req); 270 rc = __blk_end_request(req, err, nr_bytes); 271 if (rc) 272 return true; 273 fs->cur_req = NULL; 274 return false; 275 } 276 277 static void swim3_select(struct floppy_state *fs, int sel) 278 { 279 struct swim3 __iomem *sw = fs->swim3; 280 281 out_8(&sw->select, RELAX); 282 if (sel & 8) 283 out_8(&sw->control_bis, SELECT); 284 else 285 out_8(&sw->control_bic, SELECT); 286 out_8(&sw->select, sel & CA_MASK); 287 } 288 289 static void swim3_action(struct floppy_state *fs, int action) 290 { 291 struct swim3 __iomem *sw = fs->swim3; 292 293 swim3_select(fs, action); 294 udelay(1); 295 out_8(&sw->select, sw->select | LSTRB); 296 udelay(2); 297 out_8(&sw->select, sw->select & ~LSTRB); 298 udelay(1); 299 } 300 301 static int swim3_readbit(struct floppy_state *fs, int bit) 302 { 303 struct swim3 __iomem *sw = fs->swim3; 304 int stat; 305 306 swim3_select(fs, bit); 307 udelay(1); 308 stat = in_8(&sw->status); 309 return (stat & DATA) == 0; 310 } 311 312 static void start_request(struct floppy_state *fs) 313 { 314 struct request *req; 315 unsigned long x; 316 317 swim3_dbg("start request, initial state=%d\n", fs->state); 318 319 if (fs->state == idle && fs->wanted) { 320 fs->state = available; 321 wake_up(&fs->wait); 322 return; 323 } 324 while (fs->state == idle) { 325 swim3_dbg("start request, idle loop, cur_req=%p\n", fs->cur_req); 326 if (!fs->cur_req) { 327 fs->cur_req = blk_fetch_request(disks[fs->index]->queue); 328 swim3_dbg(" fetched request %p\n", fs->cur_req); 329 if (!fs->cur_req) 330 break; 331 } 332 req = fs->cur_req; 333 334 if (fs->mdev->media_bay && 335 check_media_bay(fs->mdev->media_bay) != MB_FD) { 336 swim3_dbg("%s", " media bay absent, dropping req\n"); 337 swim3_end_request(fs, -ENODEV, 0); 338 continue; 339 } 340 341 #if 0 /* This is really too verbose */ 342 swim3_dbg("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n", 343 req->rq_disk->disk_name, req->cmd, 344 (long)blk_rq_pos(req), blk_rq_sectors(req), 345 bio_data(req->bio)); 346 swim3_dbg(" errors=%d current_nr_sectors=%u\n", 347 req->errors, blk_rq_cur_sectors(req)); 348 #endif 349 350 if (blk_rq_pos(req) >= fs->total_secs) { 351 swim3_dbg(" pos out of bounds (%ld, max is %ld)\n", 352 (long)blk_rq_pos(req), (long)fs->total_secs); 353 swim3_end_request(fs, -EIO, 0); 354 continue; 355 } 356 if (fs->ejected) { 357 swim3_dbg("%s", " disk ejected\n"); 358 swim3_end_request(fs, -EIO, 0); 359 continue; 360 } 361 362 if (rq_data_dir(req) == WRITE) { 363 if (fs->write_prot < 0) 364 fs->write_prot = swim3_readbit(fs, WRITE_PROT); 365 if (fs->write_prot) { 366 swim3_dbg("%s", " try to write, disk write protected\n"); 367 swim3_end_request(fs, -EIO, 0); 368 continue; 369 } 370 } 371 372 /* Do not remove the cast. blk_rq_pos(req) is now a 373 * sector_t and can be 64 bits, but it will never go 374 * past 32 bits for this driver anyway, so we can 375 * safely cast it down and not have to do a 64/32 376 * division 377 */ 378 fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl; 379 x = ((long)blk_rq_pos(req)) % fs->secpercyl; 380 fs->head = x / fs->secpertrack; 381 fs->req_sector = x % fs->secpertrack + 1; 382 fs->state = do_transfer; 383 fs->retries = 0; 384 385 act(fs); 386 } 387 } 388 389 static void do_fd_request(struct request_queue * q) 390 { 391 start_request(q->queuedata); 392 } 393 394 static void set_timeout(struct floppy_state *fs, int nticks, 395 void (*proc)(unsigned long)) 396 { 397 if (fs->timeout_pending) 398 del_timer(&fs->timeout); 399 fs->timeout.expires = jiffies + nticks; 400 fs->timeout.function = proc; 401 fs->timeout.data = (unsigned long) fs; 402 add_timer(&fs->timeout); 403 fs->timeout_pending = 1; 404 } 405 406 static inline void scan_track(struct floppy_state *fs) 407 { 408 struct swim3 __iomem *sw = fs->swim3; 409 410 swim3_select(fs, READ_DATA_0); 411 in_8(&sw->intr); /* clear SEEN_SECTOR bit */ 412 in_8(&sw->error); 413 out_8(&sw->intr_enable, SEEN_SECTOR); 414 out_8(&sw->control_bis, DO_ACTION); 415 /* enable intr when track found */ 416 set_timeout(fs, HZ, scan_timeout); /* enable timeout */ 417 } 418 419 static inline void seek_track(struct floppy_state *fs, int n) 420 { 421 struct swim3 __iomem *sw = fs->swim3; 422 423 if (n >= 0) { 424 swim3_action(fs, SEEK_POSITIVE); 425 sw->nseek = n; 426 } else { 427 swim3_action(fs, SEEK_NEGATIVE); 428 sw->nseek = -n; 429 } 430 fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1; 431 swim3_select(fs, STEP); 432 in_8(&sw->error); 433 /* enable intr when seek finished */ 434 out_8(&sw->intr_enable, SEEK_DONE); 435 out_8(&sw->control_bis, DO_SEEK); 436 set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */ 437 fs->settle_time = 0; 438 } 439 440 static inline void init_dma(struct dbdma_cmd *cp, int cmd, 441 void *buf, int count) 442 { 443 cp->req_count = cpu_to_le16(count); 444 cp->command = cpu_to_le16(cmd); 445 cp->phy_addr = cpu_to_le32(virt_to_bus(buf)); 446 cp->xfer_status = 0; 447 } 448 449 static inline void setup_transfer(struct floppy_state *fs) 450 { 451 int n; 452 struct swim3 __iomem *sw = fs->swim3; 453 struct dbdma_cmd *cp = fs->dma_cmd; 454 struct dbdma_regs __iomem *dr = fs->dma; 455 struct request *req = fs->cur_req; 456 457 if (blk_rq_cur_sectors(req) <= 0) { 458 swim3_warn("%s", "Transfer 0 sectors ?\n"); 459 return; 460 } 461 if (rq_data_dir(req) == WRITE) 462 n = 1; 463 else { 464 n = fs->secpertrack - fs->req_sector + 1; 465 if (n > blk_rq_cur_sectors(req)) 466 n = blk_rq_cur_sectors(req); 467 } 468 469 swim3_dbg(" setup xfer at sect %d (of %d) head %d for %d\n", 470 fs->req_sector, fs->secpertrack, fs->head, n); 471 472 fs->scount = n; 473 swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0); 474 out_8(&sw->sector, fs->req_sector); 475 out_8(&sw->nsect, n); 476 out_8(&sw->gap3, 0); 477 out_le32(&dr->cmdptr, virt_to_bus(cp)); 478 if (rq_data_dir(req) == WRITE) { 479 /* Set up 3 dma commands: write preamble, data, postamble */ 480 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble)); 481 ++cp; 482 init_dma(cp, OUTPUT_MORE, bio_data(req->bio), 512); 483 ++cp; 484 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble)); 485 } else { 486 init_dma(cp, INPUT_LAST, bio_data(req->bio), n * 512); 487 } 488 ++cp; 489 out_le16(&cp->command, DBDMA_STOP); 490 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 491 in_8(&sw->error); 492 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 493 if (rq_data_dir(req) == WRITE) 494 out_8(&sw->control_bis, WRITE_SECTORS); 495 in_8(&sw->intr); 496 out_le32(&dr->control, (RUN << 16) | RUN); 497 /* enable intr when transfer complete */ 498 out_8(&sw->intr_enable, TRANSFER_DONE); 499 out_8(&sw->control_bis, DO_ACTION); 500 set_timeout(fs, 2*HZ, xfer_timeout); /* enable timeout */ 501 } 502 503 static void act(struct floppy_state *fs) 504 { 505 for (;;) { 506 swim3_dbg(" act loop, state=%d, req_cyl=%d, cur_cyl=%d\n", 507 fs->state, fs->req_cyl, fs->cur_cyl); 508 509 switch (fs->state) { 510 case idle: 511 return; /* XXX shouldn't get here */ 512 513 case locating: 514 if (swim3_readbit(fs, TRACK_ZERO)) { 515 swim3_dbg("%s", " locate track 0\n"); 516 fs->cur_cyl = 0; 517 if (fs->req_cyl == 0) 518 fs->state = do_transfer; 519 else 520 fs->state = seeking; 521 break; 522 } 523 scan_track(fs); 524 return; 525 526 case seeking: 527 if (fs->cur_cyl < 0) { 528 fs->expect_cyl = -1; 529 fs->state = locating; 530 break; 531 } 532 if (fs->req_cyl == fs->cur_cyl) { 533 swim3_warn("%s", "Whoops, seeking 0\n"); 534 fs->state = do_transfer; 535 break; 536 } 537 seek_track(fs, fs->req_cyl - fs->cur_cyl); 538 return; 539 540 case settling: 541 /* check for SEEK_COMPLETE after 30ms */ 542 fs->settle_time = (HZ + 32) / 33; 543 set_timeout(fs, fs->settle_time, settle_timeout); 544 return; 545 546 case do_transfer: 547 if (fs->cur_cyl != fs->req_cyl) { 548 if (fs->retries > 5) { 549 swim3_err("Wrong cylinder in transfer, want: %d got %d\n", 550 fs->req_cyl, fs->cur_cyl); 551 swim3_end_request(fs, -EIO, 0); 552 fs->state = idle; 553 return; 554 } 555 fs->state = seeking; 556 break; 557 } 558 setup_transfer(fs); 559 return; 560 561 case jogging: 562 seek_track(fs, -5); 563 return; 564 565 default: 566 swim3_err("Unknown state %d\n", fs->state); 567 return; 568 } 569 } 570 } 571 572 static void scan_timeout(unsigned long data) 573 { 574 struct floppy_state *fs = (struct floppy_state *) data; 575 struct swim3 __iomem *sw = fs->swim3; 576 unsigned long flags; 577 578 swim3_dbg("* scan timeout, state=%d\n", fs->state); 579 580 spin_lock_irqsave(&swim3_lock, flags); 581 fs->timeout_pending = 0; 582 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 583 out_8(&sw->select, RELAX); 584 out_8(&sw->intr_enable, 0); 585 fs->cur_cyl = -1; 586 if (fs->retries > 5) { 587 swim3_end_request(fs, -EIO, 0); 588 fs->state = idle; 589 start_request(fs); 590 } else { 591 fs->state = jogging; 592 act(fs); 593 } 594 spin_unlock_irqrestore(&swim3_lock, flags); 595 } 596 597 static void seek_timeout(unsigned long data) 598 { 599 struct floppy_state *fs = (struct floppy_state *) data; 600 struct swim3 __iomem *sw = fs->swim3; 601 unsigned long flags; 602 603 swim3_dbg("* seek timeout, state=%d\n", fs->state); 604 605 spin_lock_irqsave(&swim3_lock, flags); 606 fs->timeout_pending = 0; 607 out_8(&sw->control_bic, DO_SEEK); 608 out_8(&sw->select, RELAX); 609 out_8(&sw->intr_enable, 0); 610 swim3_err("%s", "Seek timeout\n"); 611 swim3_end_request(fs, -EIO, 0); 612 fs->state = idle; 613 start_request(fs); 614 spin_unlock_irqrestore(&swim3_lock, flags); 615 } 616 617 static void settle_timeout(unsigned long data) 618 { 619 struct floppy_state *fs = (struct floppy_state *) data; 620 struct swim3 __iomem *sw = fs->swim3; 621 unsigned long flags; 622 623 swim3_dbg("* settle timeout, state=%d\n", fs->state); 624 625 spin_lock_irqsave(&swim3_lock, flags); 626 fs->timeout_pending = 0; 627 if (swim3_readbit(fs, SEEK_COMPLETE)) { 628 out_8(&sw->select, RELAX); 629 fs->state = locating; 630 act(fs); 631 goto unlock; 632 } 633 out_8(&sw->select, RELAX); 634 if (fs->settle_time < 2*HZ) { 635 ++fs->settle_time; 636 set_timeout(fs, 1, settle_timeout); 637 goto unlock; 638 } 639 swim3_err("%s", "Seek settle timeout\n"); 640 swim3_end_request(fs, -EIO, 0); 641 fs->state = idle; 642 start_request(fs); 643 unlock: 644 spin_unlock_irqrestore(&swim3_lock, flags); 645 } 646 647 static void xfer_timeout(unsigned long data) 648 { 649 struct floppy_state *fs = (struct floppy_state *) data; 650 struct swim3 __iomem *sw = fs->swim3; 651 struct dbdma_regs __iomem *dr = fs->dma; 652 unsigned long flags; 653 int n; 654 655 swim3_dbg("* xfer timeout, state=%d\n", fs->state); 656 657 spin_lock_irqsave(&swim3_lock, flags); 658 fs->timeout_pending = 0; 659 out_le32(&dr->control, RUN << 16); 660 /* We must wait a bit for dbdma to stop */ 661 for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++) 662 udelay(1); 663 out_8(&sw->intr_enable, 0); 664 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); 665 out_8(&sw->select, RELAX); 666 swim3_err("Timeout %sing sector %ld\n", 667 (rq_data_dir(fs->cur_req)==WRITE? "writ": "read"), 668 (long)blk_rq_pos(fs->cur_req)); 669 swim3_end_request(fs, -EIO, 0); 670 fs->state = idle; 671 start_request(fs); 672 spin_unlock_irqrestore(&swim3_lock, flags); 673 } 674 675 static irqreturn_t swim3_interrupt(int irq, void *dev_id) 676 { 677 struct floppy_state *fs = (struct floppy_state *) dev_id; 678 struct swim3 __iomem *sw = fs->swim3; 679 int intr, err, n; 680 int stat, resid; 681 struct dbdma_regs __iomem *dr; 682 struct dbdma_cmd *cp; 683 unsigned long flags; 684 struct request *req = fs->cur_req; 685 686 swim3_dbg("* interrupt, state=%d\n", fs->state); 687 688 spin_lock_irqsave(&swim3_lock, flags); 689 intr = in_8(&sw->intr); 690 err = (intr & ERROR_INTR)? in_8(&sw->error): 0; 691 if ((intr & ERROR_INTR) && fs->state != do_transfer) 692 swim3_err("Non-transfer error interrupt: state=%d, dir=%x, intr=%x, err=%x\n", 693 fs->state, rq_data_dir(req), intr, err); 694 switch (fs->state) { 695 case locating: 696 if (intr & SEEN_SECTOR) { 697 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 698 out_8(&sw->select, RELAX); 699 out_8(&sw->intr_enable, 0); 700 del_timer(&fs->timeout); 701 fs->timeout_pending = 0; 702 if (sw->ctrack == 0xff) { 703 swim3_err("%s", "Seen sector but cyl=ff?\n"); 704 fs->cur_cyl = -1; 705 if (fs->retries > 5) { 706 swim3_end_request(fs, -EIO, 0); 707 fs->state = idle; 708 start_request(fs); 709 } else { 710 fs->state = jogging; 711 act(fs); 712 } 713 break; 714 } 715 fs->cur_cyl = sw->ctrack; 716 fs->cur_sector = sw->csect; 717 if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl) 718 swim3_err("Expected cyl %d, got %d\n", 719 fs->expect_cyl, fs->cur_cyl); 720 fs->state = do_transfer; 721 act(fs); 722 } 723 break; 724 case seeking: 725 case jogging: 726 if (sw->nseek == 0) { 727 out_8(&sw->control_bic, DO_SEEK); 728 out_8(&sw->select, RELAX); 729 out_8(&sw->intr_enable, 0); 730 del_timer(&fs->timeout); 731 fs->timeout_pending = 0; 732 if (fs->state == seeking) 733 ++fs->retries; 734 fs->state = settling; 735 act(fs); 736 } 737 break; 738 case settling: 739 out_8(&sw->intr_enable, 0); 740 del_timer(&fs->timeout); 741 fs->timeout_pending = 0; 742 act(fs); 743 break; 744 case do_transfer: 745 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0) 746 break; 747 out_8(&sw->intr_enable, 0); 748 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); 749 out_8(&sw->select, RELAX); 750 del_timer(&fs->timeout); 751 fs->timeout_pending = 0; 752 dr = fs->dma; 753 cp = fs->dma_cmd; 754 if (rq_data_dir(req) == WRITE) 755 ++cp; 756 /* 757 * Check that the main data transfer has finished. 758 * On writing, the swim3 sometimes doesn't use 759 * up all the bytes of the postamble, so we can still 760 * see DMA active here. That doesn't matter as long 761 * as all the sector data has been transferred. 762 */ 763 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) { 764 /* wait a little while for DMA to complete */ 765 for (n = 0; n < 100; ++n) { 766 if (cp->xfer_status != 0) 767 break; 768 udelay(1); 769 barrier(); 770 } 771 } 772 /* turn off DMA */ 773 out_le32(&dr->control, (RUN | PAUSE) << 16); 774 stat = le16_to_cpu(cp->xfer_status); 775 resid = le16_to_cpu(cp->res_count); 776 if (intr & ERROR_INTR) { 777 n = fs->scount - 1 - resid / 512; 778 if (n > 0) { 779 blk_update_request(req, 0, n << 9); 780 fs->req_sector += n; 781 } 782 if (fs->retries < 5) { 783 ++fs->retries; 784 act(fs); 785 } else { 786 swim3_err("Error %sing block %ld (err=%x)\n", 787 rq_data_dir(req) == WRITE? "writ": "read", 788 (long)blk_rq_pos(req), err); 789 swim3_end_request(fs, -EIO, 0); 790 fs->state = idle; 791 } 792 } else { 793 if ((stat & ACTIVE) == 0 || resid != 0) { 794 /* musta been an error */ 795 swim3_err("fd dma error: stat=%x resid=%d\n", stat, resid); 796 swim3_err(" state=%d, dir=%x, intr=%x, err=%x\n", 797 fs->state, rq_data_dir(req), intr, err); 798 swim3_end_request(fs, -EIO, 0); 799 fs->state = idle; 800 start_request(fs); 801 break; 802 } 803 fs->retries = 0; 804 if (swim3_end_request(fs, 0, fs->scount << 9)) { 805 fs->req_sector += fs->scount; 806 if (fs->req_sector > fs->secpertrack) { 807 fs->req_sector -= fs->secpertrack; 808 if (++fs->head > 1) { 809 fs->head = 0; 810 ++fs->req_cyl; 811 } 812 } 813 act(fs); 814 } else 815 fs->state = idle; 816 } 817 if (fs->state == idle) 818 start_request(fs); 819 break; 820 default: 821 swim3_err("Don't know what to do in state %d\n", fs->state); 822 } 823 spin_unlock_irqrestore(&swim3_lock, flags); 824 return IRQ_HANDLED; 825 } 826 827 /* 828 static void fd_dma_interrupt(int irq, void *dev_id) 829 { 830 } 831 */ 832 833 /* Called under the mutex to grab exclusive access to a drive */ 834 static int grab_drive(struct floppy_state *fs, enum swim_state state, 835 int interruptible) 836 { 837 unsigned long flags; 838 839 swim3_dbg("%s", "-> grab drive\n"); 840 841 spin_lock_irqsave(&swim3_lock, flags); 842 if (fs->state != idle && fs->state != available) { 843 ++fs->wanted; 844 /* this will enable irqs in order to sleep */ 845 if (!interruptible) 846 wait_event_lock_irq(fs->wait, 847 fs->state == available, 848 swim3_lock); 849 else if (wait_event_interruptible_lock_irq(fs->wait, 850 fs->state == available, 851 swim3_lock)) { 852 --fs->wanted; 853 spin_unlock_irqrestore(&swim3_lock, flags); 854 return -EINTR; 855 } 856 --fs->wanted; 857 } 858 fs->state = state; 859 spin_unlock_irqrestore(&swim3_lock, flags); 860 861 return 0; 862 } 863 864 static void release_drive(struct floppy_state *fs) 865 { 866 unsigned long flags; 867 868 swim3_dbg("%s", "-> release drive\n"); 869 870 spin_lock_irqsave(&swim3_lock, flags); 871 fs->state = idle; 872 start_request(fs); 873 spin_unlock_irqrestore(&swim3_lock, flags); 874 } 875 876 static int fd_eject(struct floppy_state *fs) 877 { 878 int err, n; 879 880 err = grab_drive(fs, ejecting, 1); 881 if (err) 882 return err; 883 swim3_action(fs, EJECT); 884 for (n = 20; n > 0; --n) { 885 if (signal_pending(current)) { 886 err = -EINTR; 887 break; 888 } 889 swim3_select(fs, RELAX); 890 schedule_timeout_interruptible(1); 891 if (swim3_readbit(fs, DISK_IN) == 0) 892 break; 893 } 894 swim3_select(fs, RELAX); 895 udelay(150); 896 fs->ejected = 1; 897 release_drive(fs); 898 return err; 899 } 900 901 static struct floppy_struct floppy_type = 902 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */ 903 904 static int floppy_locked_ioctl(struct block_device *bdev, fmode_t mode, 905 unsigned int cmd, unsigned long param) 906 { 907 struct floppy_state *fs = bdev->bd_disk->private_data; 908 int err; 909 910 if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)) 911 return -EPERM; 912 913 if (fs->mdev->media_bay && 914 check_media_bay(fs->mdev->media_bay) != MB_FD) 915 return -ENXIO; 916 917 switch (cmd) { 918 case FDEJECT: 919 if (fs->ref_count != 1) 920 return -EBUSY; 921 err = fd_eject(fs); 922 return err; 923 case FDGETPRM: 924 if (copy_to_user((void __user *) param, &floppy_type, 925 sizeof(struct floppy_struct))) 926 return -EFAULT; 927 return 0; 928 } 929 return -ENOTTY; 930 } 931 932 static int floppy_ioctl(struct block_device *bdev, fmode_t mode, 933 unsigned int cmd, unsigned long param) 934 { 935 int ret; 936 937 mutex_lock(&swim3_mutex); 938 ret = floppy_locked_ioctl(bdev, mode, cmd, param); 939 mutex_unlock(&swim3_mutex); 940 941 return ret; 942 } 943 944 static int floppy_open(struct block_device *bdev, fmode_t mode) 945 { 946 struct floppy_state *fs = bdev->bd_disk->private_data; 947 struct swim3 __iomem *sw = fs->swim3; 948 int n, err = 0; 949 950 if (fs->ref_count == 0) { 951 if (fs->mdev->media_bay && 952 check_media_bay(fs->mdev->media_bay) != MB_FD) 953 return -ENXIO; 954 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2); 955 out_8(&sw->control_bic, 0xff); 956 out_8(&sw->mode, 0x95); 957 udelay(10); 958 out_8(&sw->intr_enable, 0); 959 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE); 960 swim3_action(fs, MOTOR_ON); 961 fs->write_prot = -1; 962 fs->cur_cyl = -1; 963 for (n = 0; n < 2 * HZ; ++n) { 964 if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE)) 965 break; 966 if (signal_pending(current)) { 967 err = -EINTR; 968 break; 969 } 970 swim3_select(fs, RELAX); 971 schedule_timeout_interruptible(1); 972 } 973 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0 974 || swim3_readbit(fs, DISK_IN) == 0)) 975 err = -ENXIO; 976 swim3_action(fs, SETMFM); 977 swim3_select(fs, RELAX); 978 979 } else if (fs->ref_count == -1 || mode & FMODE_EXCL) 980 return -EBUSY; 981 982 if (err == 0 && (mode & FMODE_NDELAY) == 0 983 && (mode & (FMODE_READ|FMODE_WRITE))) { 984 check_disk_change(bdev); 985 if (fs->ejected) 986 err = -ENXIO; 987 } 988 989 if (err == 0 && (mode & FMODE_WRITE)) { 990 if (fs->write_prot < 0) 991 fs->write_prot = swim3_readbit(fs, WRITE_PROT); 992 if (fs->write_prot) 993 err = -EROFS; 994 } 995 996 if (err) { 997 if (fs->ref_count == 0) { 998 swim3_action(fs, MOTOR_OFF); 999 out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE); 1000 swim3_select(fs, RELAX); 1001 } 1002 return err; 1003 } 1004 1005 if (mode & FMODE_EXCL) 1006 fs->ref_count = -1; 1007 else 1008 ++fs->ref_count; 1009 1010 return 0; 1011 } 1012 1013 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode) 1014 { 1015 int ret; 1016 1017 mutex_lock(&swim3_mutex); 1018 ret = floppy_open(bdev, mode); 1019 mutex_unlock(&swim3_mutex); 1020 1021 return ret; 1022 } 1023 1024 static void floppy_release(struct gendisk *disk, fmode_t mode) 1025 { 1026 struct floppy_state *fs = disk->private_data; 1027 struct swim3 __iomem *sw = fs->swim3; 1028 1029 mutex_lock(&swim3_mutex); 1030 if (fs->ref_count > 0 && --fs->ref_count == 0) { 1031 swim3_action(fs, MOTOR_OFF); 1032 out_8(&sw->control_bic, 0xff); 1033 swim3_select(fs, RELAX); 1034 } 1035 mutex_unlock(&swim3_mutex); 1036 } 1037 1038 static unsigned int floppy_check_events(struct gendisk *disk, 1039 unsigned int clearing) 1040 { 1041 struct floppy_state *fs = disk->private_data; 1042 return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0; 1043 } 1044 1045 static int floppy_revalidate(struct gendisk *disk) 1046 { 1047 struct floppy_state *fs = disk->private_data; 1048 struct swim3 __iomem *sw; 1049 int ret, n; 1050 1051 if (fs->mdev->media_bay && 1052 check_media_bay(fs->mdev->media_bay) != MB_FD) 1053 return -ENXIO; 1054 1055 sw = fs->swim3; 1056 grab_drive(fs, revalidating, 0); 1057 out_8(&sw->intr_enable, 0); 1058 out_8(&sw->control_bis, DRIVE_ENABLE); 1059 swim3_action(fs, MOTOR_ON); /* necessary? */ 1060 fs->write_prot = -1; 1061 fs->cur_cyl = -1; 1062 mdelay(1); 1063 for (n = HZ; n > 0; --n) { 1064 if (swim3_readbit(fs, SEEK_COMPLETE)) 1065 break; 1066 if (signal_pending(current)) 1067 break; 1068 swim3_select(fs, RELAX); 1069 schedule_timeout_interruptible(1); 1070 } 1071 ret = swim3_readbit(fs, SEEK_COMPLETE) == 0 1072 || swim3_readbit(fs, DISK_IN) == 0; 1073 if (ret) 1074 swim3_action(fs, MOTOR_OFF); 1075 else { 1076 fs->ejected = 0; 1077 swim3_action(fs, SETMFM); 1078 } 1079 swim3_select(fs, RELAX); 1080 1081 release_drive(fs); 1082 return ret; 1083 } 1084 1085 static const struct block_device_operations floppy_fops = { 1086 .open = floppy_unlocked_open, 1087 .release = floppy_release, 1088 .ioctl = floppy_ioctl, 1089 .check_events = floppy_check_events, 1090 .revalidate_disk= floppy_revalidate, 1091 }; 1092 1093 static void swim3_mb_event(struct macio_dev* mdev, int mb_state) 1094 { 1095 struct floppy_state *fs = macio_get_drvdata(mdev); 1096 struct swim3 __iomem *sw; 1097 1098 if (!fs) 1099 return; 1100 1101 sw = fs->swim3; 1102 1103 if (mb_state != MB_FD) 1104 return; 1105 1106 /* Clear state */ 1107 out_8(&sw->intr_enable, 0); 1108 in_8(&sw->intr); 1109 in_8(&sw->error); 1110 } 1111 1112 static int swim3_add_device(struct macio_dev *mdev, int index) 1113 { 1114 struct device_node *swim = mdev->ofdev.dev.of_node; 1115 struct floppy_state *fs = &floppy_states[index]; 1116 int rc = -EBUSY; 1117 1118 /* Do this first for message macros */ 1119 memset(fs, 0, sizeof(*fs)); 1120 fs->mdev = mdev; 1121 fs->index = index; 1122 1123 /* Check & Request resources */ 1124 if (macio_resource_count(mdev) < 2) { 1125 swim3_err("%s", "No address in device-tree\n"); 1126 return -ENXIO; 1127 } 1128 if (macio_irq_count(mdev) < 1) { 1129 swim3_err("%s", "No interrupt in device-tree\n"); 1130 return -ENXIO; 1131 } 1132 if (macio_request_resource(mdev, 0, "swim3 (mmio)")) { 1133 swim3_err("%s", "Can't request mmio resource\n"); 1134 return -EBUSY; 1135 } 1136 if (macio_request_resource(mdev, 1, "swim3 (dma)")) { 1137 swim3_err("%s", "Can't request dma resource\n"); 1138 macio_release_resource(mdev, 0); 1139 return -EBUSY; 1140 } 1141 dev_set_drvdata(&mdev->ofdev.dev, fs); 1142 1143 if (mdev->media_bay == NULL) 1144 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1); 1145 1146 fs->state = idle; 1147 fs->swim3 = (struct swim3 __iomem *) 1148 ioremap(macio_resource_start(mdev, 0), 0x200); 1149 if (fs->swim3 == NULL) { 1150 swim3_err("%s", "Couldn't map mmio registers\n"); 1151 rc = -ENOMEM; 1152 goto out_release; 1153 } 1154 fs->dma = (struct dbdma_regs __iomem *) 1155 ioremap(macio_resource_start(mdev, 1), 0x200); 1156 if (fs->dma == NULL) { 1157 swim3_err("%s", "Couldn't map dma registers\n"); 1158 iounmap(fs->swim3); 1159 rc = -ENOMEM; 1160 goto out_release; 1161 } 1162 fs->swim3_intr = macio_irq(mdev, 0); 1163 fs->dma_intr = macio_irq(mdev, 1); 1164 fs->cur_cyl = -1; 1165 fs->cur_sector = -1; 1166 fs->secpercyl = 36; 1167 fs->secpertrack = 18; 1168 fs->total_secs = 2880; 1169 init_waitqueue_head(&fs->wait); 1170 1171 fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space); 1172 memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd)); 1173 fs->dma_cmd[1].command = cpu_to_le16(DBDMA_STOP); 1174 1175 if (mdev->media_bay == NULL || check_media_bay(mdev->media_bay) == MB_FD) 1176 swim3_mb_event(mdev, MB_FD); 1177 1178 if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) { 1179 swim3_err("%s", "Couldn't request interrupt\n"); 1180 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0); 1181 goto out_unmap; 1182 return -EBUSY; 1183 } 1184 1185 init_timer(&fs->timeout); 1186 1187 swim3_info("SWIM3 floppy controller %s\n", 1188 mdev->media_bay ? "in media bay" : ""); 1189 1190 return 0; 1191 1192 out_unmap: 1193 iounmap(fs->dma); 1194 iounmap(fs->swim3); 1195 1196 out_release: 1197 macio_release_resource(mdev, 0); 1198 macio_release_resource(mdev, 1); 1199 1200 return rc; 1201 } 1202 1203 static int swim3_attach(struct macio_dev *mdev, 1204 const struct of_device_id *match) 1205 { 1206 struct gendisk *disk; 1207 int index, rc; 1208 1209 index = floppy_count++; 1210 if (index >= MAX_FLOPPIES) 1211 return -ENXIO; 1212 1213 /* Add the drive */ 1214 rc = swim3_add_device(mdev, index); 1215 if (rc) 1216 return rc; 1217 /* Now register that disk. Same comment about failure handling */ 1218 disk = disks[index] = alloc_disk(1); 1219 if (disk == NULL) 1220 return -ENOMEM; 1221 disk->queue = blk_init_queue(do_fd_request, &swim3_lock); 1222 if (disk->queue == NULL) { 1223 put_disk(disk); 1224 return -ENOMEM; 1225 } 1226 disk->queue->queuedata = &floppy_states[index]; 1227 1228 if (index == 0) { 1229 /* If we failed, there isn't much we can do as the driver is still 1230 * too dumb to remove the device, just bail out 1231 */ 1232 if (register_blkdev(FLOPPY_MAJOR, "fd")) 1233 return 0; 1234 } 1235 1236 disk->major = FLOPPY_MAJOR; 1237 disk->first_minor = index; 1238 disk->fops = &floppy_fops; 1239 disk->private_data = &floppy_states[index]; 1240 disk->flags |= GENHD_FL_REMOVABLE; 1241 sprintf(disk->disk_name, "fd%d", index); 1242 set_capacity(disk, 2880); 1243 add_disk(disk); 1244 1245 return 0; 1246 } 1247 1248 static struct of_device_id swim3_match[] = 1249 { 1250 { 1251 .name = "swim3", 1252 }, 1253 { 1254 .compatible = "ohare-swim3" 1255 }, 1256 { 1257 .compatible = "swim3" 1258 }, 1259 { /* end of list */ } 1260 }; 1261 1262 static struct macio_driver swim3_driver = 1263 { 1264 .driver = { 1265 .name = "swim3", 1266 .of_match_table = swim3_match, 1267 }, 1268 .probe = swim3_attach, 1269 #ifdef CONFIG_PMAC_MEDIABAY 1270 .mediabay_event = swim3_mb_event, 1271 #endif 1272 #if 0 1273 .suspend = swim3_suspend, 1274 .resume = swim3_resume, 1275 #endif 1276 }; 1277 1278 1279 int swim3_init(void) 1280 { 1281 macio_register_driver(&swim3_driver); 1282 return 0; 1283 } 1284 1285 module_init(swim3_init) 1286 1287 MODULE_LICENSE("GPL"); 1288 MODULE_AUTHOR("Paul Mackerras"); 1289 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR); 1290