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 <asm/io.h> 34#include <asm/dbdma.h> 35#include <asm/prom.h> 36#include <asm/uaccess.h> 37#include <asm/mediabay.h> 38#include <asm/machdep.h> 39#include <asm/pmac_feature.h> 40 41#define MAX_FLOPPIES 2 42 43static DEFINE_MUTEX(swim3_mutex); 44static struct gendisk *disks[MAX_FLOPPIES]; 45 46enum swim_state { 47 idle, 48 locating, 49 seeking, 50 settling, 51 do_transfer, 52 jogging, 53 available, 54 revalidating, 55 ejecting 56}; 57 58#define REG(x) unsigned char x; char x ## _pad[15]; 59 60/* 61 * The names for these registers mostly represent speculation on my part. 62 * It will be interesting to see how close they are to the names Apple uses. 63 */ 64struct swim3 { 65 REG(data); 66 REG(timer); /* counts down at 1MHz */ 67 REG(error); 68 REG(mode); 69 REG(select); /* controls CA0, CA1, CA2 and LSTRB signals */ 70 REG(setup); 71 REG(control); /* writing bits clears them */ 72 REG(status); /* writing bits sets them in control */ 73 REG(intr); 74 REG(nseek); /* # tracks to seek */ 75 REG(ctrack); /* current track number */ 76 REG(csect); /* current sector number */ 77 REG(gap3); /* size of gap 3 in track format */ 78 REG(sector); /* sector # to read or write */ 79 REG(nsect); /* # sectors to read or write */ 80 REG(intr_enable); 81}; 82 83#define control_bic control 84#define control_bis status 85 86/* Bits in select register */ 87#define CA_MASK 7 88#define LSTRB 8 89 90/* Bits in control register */ 91#define DO_SEEK 0x80 92#define FORMAT 0x40 93#define SELECT 0x20 94#define WRITE_SECTORS 0x10 95#define DO_ACTION 0x08 96#define DRIVE2_ENABLE 0x04 97#define DRIVE_ENABLE 0x02 98#define INTR_ENABLE 0x01 99 100/* Bits in status register */ 101#define FIFO_1BYTE 0x80 102#define FIFO_2BYTE 0x40 103#define ERROR 0x20 104#define DATA 0x08 105#define RDDATA 0x04 106#define INTR_PENDING 0x02 107#define MARK_BYTE 0x01 108 109/* Bits in intr and intr_enable registers */ 110#define ERROR_INTR 0x20 111#define DATA_CHANGED 0x10 112#define TRANSFER_DONE 0x08 113#define SEEN_SECTOR 0x04 114#define SEEK_DONE 0x02 115#define TIMER_DONE 0x01 116 117/* Bits in error register */ 118#define ERR_DATA_CRC 0x80 119#define ERR_ADDR_CRC 0x40 120#define ERR_OVERRUN 0x04 121#define ERR_UNDERRUN 0x01 122 123/* Bits in setup register */ 124#define S_SW_RESET 0x80 125#define S_GCR_WRITE 0x40 126#define S_IBM_DRIVE 0x20 127#define S_TEST_MODE 0x10 128#define S_FCLK_DIV2 0x08 129#define S_GCR 0x04 130#define S_COPY_PROT 0x02 131#define S_INV_WDATA 0x01 132 133/* Select values for swim3_action */ 134#define SEEK_POSITIVE 0 135#define SEEK_NEGATIVE 4 136#define STEP 1 137#define MOTOR_ON 2 138#define MOTOR_OFF 6 139#define INDEX 3 140#define EJECT 7 141#define SETMFM 9 142#define SETGCR 13 143 144/* Select values for swim3_select and swim3_readbit */ 145#define STEP_DIR 0 146#define STEPPING 1 147#define MOTOR_ON 2 148#define RELAX 3 /* also eject in progress */ 149#define READ_DATA_0 4 150#define TWOMEG_DRIVE 5 151#define SINGLE_SIDED 6 /* drive or diskette is 4MB type? */ 152#define DRIVE_PRESENT 7 153#define DISK_IN 8 154#define WRITE_PROT 9 155#define TRACK_ZERO 10 156#define TACHO 11 157#define READ_DATA_1 12 158#define MFM_MODE 13 159#define SEEK_COMPLETE 14 160#define ONEMEG_MEDIA 15 161 162/* Definitions of values used in writing and formatting */ 163#define DATA_ESCAPE 0x99 164#define GCR_SYNC_EXC 0x3f 165#define GCR_SYNC_CONV 0x80 166#define GCR_FIRST_MARK 0xd5 167#define GCR_SECOND_MARK 0xaa 168#define GCR_ADDR_MARK "\xd5\xaa\x00" 169#define GCR_DATA_MARK "\xd5\xaa\x0b" 170#define GCR_SLIP_BYTE "\x27\xaa" 171#define GCR_SELF_SYNC "\x3f\xbf\x1e\x34\x3c\x3f" 172 173#define DATA_99 "\x99\x99" 174#define MFM_ADDR_MARK "\x99\xa1\x99\xa1\x99\xa1\x99\xfe" 175#define MFM_INDEX_MARK "\x99\xc2\x99\xc2\x99\xc2\x99\xfc" 176#define MFM_GAP_LEN 12 177 178struct floppy_state { 179 enum swim_state state; 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 macio_dev *mdev; 205 char dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)]; 206 int index; 207 struct request *cur_req; 208}; 209 210#define swim3_err(fmt, arg...) dev_err(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) 211#define swim3_warn(fmt, arg...) dev_warn(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) 212#define swim3_info(fmt, arg...) dev_info(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) 213 214#ifdef DEBUG 215#define swim3_dbg(fmt, arg...) dev_dbg(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) 216#else 217#define swim3_dbg(fmt, arg...) do { } while(0) 218#endif 219 220static struct floppy_state floppy_states[MAX_FLOPPIES]; 221static int floppy_count = 0; 222static DEFINE_SPINLOCK(swim3_lock); 223 224static unsigned short write_preamble[] = { 225 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */ 226 0, 0, 0, 0, 0, 0, /* sync field */ 227 0x99a1, 0x99a1, 0x99a1, 0x99fb, /* data address mark */ 228 0x990f /* no escape for 512 bytes */ 229}; 230 231static unsigned short write_postamble[] = { 232 0x9904, /* insert CRC */ 233 0x4e4e, 0x4e4e, 234 0x9908, /* stop writing */ 235 0, 0, 0, 0, 0, 0 236}; 237 238static void seek_track(struct floppy_state *fs, int n); 239static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count); 240static void act(struct floppy_state *fs); 241static void scan_timeout(unsigned long data); 242static void seek_timeout(unsigned long data); 243static void settle_timeout(unsigned long data); 244static void xfer_timeout(unsigned long data); 245static irqreturn_t swim3_interrupt(int irq, void *dev_id); 246/*static void fd_dma_interrupt(int irq, void *dev_id);*/ 247static int grab_drive(struct floppy_state *fs, enum swim_state state, 248 int interruptible); 249static void release_drive(struct floppy_state *fs); 250static int fd_eject(struct floppy_state *fs); 251static int floppy_ioctl(struct block_device *bdev, fmode_t mode, 252 unsigned int cmd, unsigned long param); 253static int floppy_open(struct block_device *bdev, fmode_t mode); 254static int floppy_release(struct gendisk *disk, fmode_t mode); 255static unsigned int floppy_check_events(struct gendisk *disk, 256 unsigned int clearing); 257static int floppy_revalidate(struct gendisk *disk); 258 259static bool swim3_end_request(struct floppy_state *fs, int err, unsigned int nr_bytes) 260{ 261 struct request *req = fs->cur_req; 262 int rc; 263 264 swim3_dbg(" end request, err=%d nr_bytes=%d, cur_req=%p\n", 265 err, nr_bytes, req); 266 267 if (err) 268 nr_bytes = blk_rq_cur_bytes(req); 269 rc = __blk_end_request(req, err, nr_bytes); 270 if (rc) 271 return true; 272 fs->cur_req = NULL; 273 return false; 274} 275 276static void swim3_select(struct floppy_state *fs, int sel) 277{ 278 struct swim3 __iomem *sw = fs->swim3; 279 280 out_8(&sw->select, RELAX); 281 if (sel & 8) 282 out_8(&sw->control_bis, SELECT); 283 else 284 out_8(&sw->control_bic, SELECT); 285 out_8(&sw->select, sel & CA_MASK); 286} 287 288static void swim3_action(struct floppy_state *fs, int action) 289{ 290 struct swim3 __iomem *sw = fs->swim3; 291 292 swim3_select(fs, action); 293 udelay(1); 294 out_8(&sw->select, sw->select | LSTRB); 295 udelay(2); 296 out_8(&sw->select, sw->select & ~LSTRB); 297 udelay(1); 298} 299 300static int swim3_readbit(struct floppy_state *fs, int bit) 301{ 302 struct swim3 __iomem *sw = fs->swim3; 303 int stat; 304 305 swim3_select(fs, bit); 306 udelay(1); 307 stat = in_8(&sw->status); 308 return (stat & DATA) == 0; 309} 310 311static void start_request(struct floppy_state *fs) 312{ 313 struct request *req; 314 unsigned long x; 315 316 swim3_dbg("start request, initial state=%d\n", fs->state); 317 318 if (fs->state == idle && fs->wanted) { 319 fs->state = available; 320 wake_up(&fs->wait); 321 return; 322 } 323 while (fs->state == idle) { 324 swim3_dbg("start request, idle loop, cur_req=%p\n", fs->cur_req); 325 if (!fs->cur_req) { 326 fs->cur_req = blk_fetch_request(disks[fs->index]->queue); 327 swim3_dbg(" fetched request %p\n", fs->cur_req); 328 if (!fs->cur_req) 329 break; 330 } 331 req = fs->cur_req; 332 333 if (fs->mdev->media_bay && 334 check_media_bay(fs->mdev->media_bay) != MB_FD) { 335 swim3_dbg("%s", " media bay absent, dropping req\n"); 336 swim3_end_request(fs, -ENODEV, 0); 337 continue; 338 } 339 340#if 0 /* This is really too verbose */ 341 swim3_dbg("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n", 342 req->rq_disk->disk_name, req->cmd, 343 (long)blk_rq_pos(req), blk_rq_sectors(req), 344 req->buffer); 345 swim3_dbg(" errors=%d current_nr_sectors=%u\n", 346 req->errors, blk_rq_cur_sectors(req)); 347#endif 348 349 if (blk_rq_pos(req) >= fs->total_secs) { 350 swim3_dbg(" pos out of bounds (%ld, max is %ld)\n", 351 (long)blk_rq_pos(req), (long)fs->total_secs); 352 swim3_end_request(fs, -EIO, 0); 353 continue; 354 } 355 if (fs->ejected) { 356 swim3_dbg("%s", " disk ejected\n"); 357 swim3_end_request(fs, -EIO, 0); 358 continue; 359 } 360 361 if (rq_data_dir(req) == WRITE) { 362 if (fs->write_prot < 0) 363 fs->write_prot = swim3_readbit(fs, WRITE_PROT); 364 if (fs->write_prot) { 365 swim3_dbg("%s", " try to write, disk write protected\n"); 366 swim3_end_request(fs, -EIO, 0); 367 continue; 368 } 369 } 370 371 /* Do not remove the cast. blk_rq_pos(req) is now a 372 * sector_t and can be 64 bits, but it will never go 373 * past 32 bits for this driver anyway, so we can 374 * safely cast it down and not have to do a 64/32 375 * division 376 */ 377 fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl; 378 x = ((long)blk_rq_pos(req)) % fs->secpercyl; 379 fs->head = x / fs->secpertrack; 380 fs->req_sector = x % fs->secpertrack + 1; 381 fs->state = do_transfer; 382 fs->retries = 0; 383 384 act(fs); 385 } 386} 387 388static void do_fd_request(struct request_queue * q) 389{ 390 start_request(q->queuedata); 391} 392 393static void set_timeout(struct floppy_state *fs, int nticks, 394 void (*proc)(unsigned long)) 395{ 396 if (fs->timeout_pending) 397 del_timer(&fs->timeout); 398 fs->timeout.expires = jiffies + nticks; 399 fs->timeout.function = proc; 400 fs->timeout.data = (unsigned long) fs; 401 add_timer(&fs->timeout); 402 fs->timeout_pending = 1; 403} 404 405static inline void scan_track(struct floppy_state *fs) 406{ 407 struct swim3 __iomem *sw = fs->swim3; 408 409 swim3_select(fs, READ_DATA_0); 410 in_8(&sw->intr); /* clear SEEN_SECTOR bit */ 411 in_8(&sw->error); 412 out_8(&sw->intr_enable, SEEN_SECTOR); 413 out_8(&sw->control_bis, DO_ACTION); 414 /* enable intr when track found */ 415 set_timeout(fs, HZ, scan_timeout); /* enable timeout */ 416} 417 418static inline void seek_track(struct floppy_state *fs, int n) 419{ 420 struct swim3 __iomem *sw = fs->swim3; 421 422 if (n >= 0) { 423 swim3_action(fs, SEEK_POSITIVE); 424 sw->nseek = n; 425 } else { 426 swim3_action(fs, SEEK_NEGATIVE); 427 sw->nseek = -n; 428 } 429 fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1; 430 swim3_select(fs, STEP); 431 in_8(&sw->error); 432 /* enable intr when seek finished */ 433 out_8(&sw->intr_enable, SEEK_DONE); 434 out_8(&sw->control_bis, DO_SEEK); 435 set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */ 436 fs->settle_time = 0; 437} 438 439static inline void init_dma(struct dbdma_cmd *cp, int cmd, 440 void *buf, int count) 441{ 442 st_le16(&cp->req_count, count); 443 st_le16(&cp->command, cmd); 444 st_le32(&cp->phy_addr, virt_to_bus(buf)); 445 cp->xfer_status = 0; 446} 447 448static inline void setup_transfer(struct floppy_state *fs) 449{ 450 int n; 451 struct swim3 __iomem *sw = fs->swim3; 452 struct dbdma_cmd *cp = fs->dma_cmd; 453 struct dbdma_regs __iomem *dr = fs->dma; 454 struct request *req = fs->cur_req; 455 456 if (blk_rq_cur_sectors(req) <= 0) { 457 swim3_warn("%s", "Transfer 0 sectors ?\n"); 458 return; 459 } 460 if (rq_data_dir(req) == WRITE) 461 n = 1; 462 else { 463 n = fs->secpertrack - fs->req_sector + 1; 464 if (n > blk_rq_cur_sectors(req)) 465 n = blk_rq_cur_sectors(req); 466 } 467 468 swim3_dbg(" setup xfer at sect %d (of %d) head %d for %d\n", 469 fs->req_sector, fs->secpertrack, fs->head, n); 470 471 fs->scount = n; 472 swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0); 473 out_8(&sw->sector, fs->req_sector); 474 out_8(&sw->nsect, n); 475 out_8(&sw->gap3, 0); 476 out_le32(&dr->cmdptr, virt_to_bus(cp)); 477 if (rq_data_dir(req) == WRITE) { 478 /* Set up 3 dma commands: write preamble, data, postamble */ 479 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble)); 480 ++cp; 481 init_dma(cp, OUTPUT_MORE, req->buffer, 512); 482 ++cp; 483 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble)); 484 } else { 485 init_dma(cp, INPUT_LAST, req->buffer, n * 512); 486 } 487 ++cp; 488 out_le16(&cp->command, DBDMA_STOP); 489 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 490 in_8(&sw->error); 491 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 492 if (rq_data_dir(req) == WRITE) 493 out_8(&sw->control_bis, WRITE_SECTORS); 494 in_8(&sw->intr); 495 out_le32(&dr->control, (RUN << 16) | RUN); 496 /* enable intr when transfer complete */ 497 out_8(&sw->intr_enable, TRANSFER_DONE); 498 out_8(&sw->control_bis, DO_ACTION); 499 set_timeout(fs, 2*HZ, xfer_timeout); /* enable timeout */ 500} 501 502static void act(struct floppy_state *fs) 503{ 504 for (;;) { 505 swim3_dbg(" act loop, state=%d, req_cyl=%d, cur_cyl=%d\n", 506 fs->state, fs->req_cyl, fs->cur_cyl); 507 508 switch (fs->state) { 509 case idle: 510 return; /* XXX shouldn't get here */ 511 512 case locating: 513 if (swim3_readbit(fs, TRACK_ZERO)) { 514 swim3_dbg("%s", " locate track 0\n"); 515 fs->cur_cyl = 0; 516 if (fs->req_cyl == 0) 517 fs->state = do_transfer; 518 else 519 fs->state = seeking; 520 break; 521 } 522 scan_track(fs); 523 return; 524 525 case seeking: 526 if (fs->cur_cyl < 0) { 527 fs->expect_cyl = -1; 528 fs->state = locating; 529 break; 530 } 531 if (fs->req_cyl == fs->cur_cyl) { 532 swim3_warn("%s", "Whoops, seeking 0\n"); 533 fs->state = do_transfer; 534 break; 535 } 536 seek_track(fs, fs->req_cyl - fs->cur_cyl); 537 return; 538 539 case settling: 540 /* check for SEEK_COMPLETE after 30ms */ 541 fs->settle_time = (HZ + 32) / 33; 542 set_timeout(fs, fs->settle_time, settle_timeout); 543 return; 544 545 case do_transfer: 546 if (fs->cur_cyl != fs->req_cyl) { 547 if (fs->retries > 5) { 548 swim3_err("Wrong cylinder in transfer, want: %d got %d\n", 549 fs->req_cyl, fs->cur_cyl); 550 swim3_end_request(fs, -EIO, 0); 551 fs->state = idle; 552 return; 553 } 554 fs->state = seeking; 555 break; 556 } 557 setup_transfer(fs); 558 return; 559 560 case jogging: 561 seek_track(fs, -5); 562 return; 563 564 default: 565 swim3_err("Unknown state %d\n", fs->state); 566 return; 567 } 568 } 569} 570 571static void scan_timeout(unsigned long data) 572{ 573 struct floppy_state *fs = (struct floppy_state *) data; 574 struct swim3 __iomem *sw = fs->swim3; 575 unsigned long flags; 576 577 swim3_dbg("* scan timeout, state=%d\n", fs->state); 578 579 spin_lock_irqsave(&swim3_lock, flags); 580 fs->timeout_pending = 0; 581 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 582 out_8(&sw->select, RELAX); 583 out_8(&sw->intr_enable, 0); 584 fs->cur_cyl = -1; 585 if (fs->retries > 5) { 586 swim3_end_request(fs, -EIO, 0); 587 fs->state = idle; 588 start_request(fs); 589 } else { 590 fs->state = jogging; 591 act(fs); 592 } 593 spin_unlock_irqrestore(&swim3_lock, flags); 594} 595 596static void seek_timeout(unsigned long data) 597{ 598 struct floppy_state *fs = (struct floppy_state *) data; 599 struct swim3 __iomem *sw = fs->swim3; 600 unsigned long flags; 601 602 swim3_dbg("* seek timeout, state=%d\n", fs->state); 603 604 spin_lock_irqsave(&swim3_lock, flags); 605 fs->timeout_pending = 0; 606 out_8(&sw->control_bic, DO_SEEK); 607 out_8(&sw->select, RELAX); 608 out_8(&sw->intr_enable, 0); 609 swim3_err("%s", "Seek timeout\n"); 610 swim3_end_request(fs, -EIO, 0); 611 fs->state = idle; 612 start_request(fs); 613 spin_unlock_irqrestore(&swim3_lock, flags); 614} 615 616static void settle_timeout(unsigned long data) 617{ 618 struct floppy_state *fs = (struct floppy_state *) data; 619 struct swim3 __iomem *sw = fs->swim3; 620 unsigned long flags; 621 622 swim3_dbg("* settle timeout, state=%d\n", fs->state); 623 624 spin_lock_irqsave(&swim3_lock, flags); 625 fs->timeout_pending = 0; 626 if (swim3_readbit(fs, SEEK_COMPLETE)) { 627 out_8(&sw->select, RELAX); 628 fs->state = locating; 629 act(fs); 630 goto unlock; 631 } 632 out_8(&sw->select, RELAX); 633 if (fs->settle_time < 2*HZ) { 634 ++fs->settle_time; 635 set_timeout(fs, 1, settle_timeout); 636 goto unlock; 637 } 638 swim3_err("%s", "Seek settle timeout\n"); 639 swim3_end_request(fs, -EIO, 0); 640 fs->state = idle; 641 start_request(fs); 642 unlock: 643 spin_unlock_irqrestore(&swim3_lock, flags); 644} 645 646static void xfer_timeout(unsigned long data) 647{ 648 struct floppy_state *fs = (struct floppy_state *) data; 649 struct swim3 __iomem *sw = fs->swim3; 650 struct dbdma_regs __iomem *dr = fs->dma; 651 unsigned long flags; 652 int n; 653 654 swim3_dbg("* xfer timeout, state=%d\n", fs->state); 655 656 spin_lock_irqsave(&swim3_lock, flags); 657 fs->timeout_pending = 0; 658 out_le32(&dr->control, RUN << 16); 659 /* We must wait a bit for dbdma to stop */ 660 for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++) 661 udelay(1); 662 out_8(&sw->intr_enable, 0); 663 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); 664 out_8(&sw->select, RELAX); 665 swim3_err("Timeout %sing sector %ld\n", 666 (rq_data_dir(fs->cur_req)==WRITE? "writ": "read"), 667 (long)blk_rq_pos(fs->cur_req)); 668 swim3_end_request(fs, -EIO, 0); 669 fs->state = idle; 670 start_request(fs); 671 spin_unlock_irqrestore(&swim3_lock, flags); 672} 673 674static irqreturn_t swim3_interrupt(int irq, void *dev_id) 675{ 676 struct floppy_state *fs = (struct floppy_state *) dev_id; 677 struct swim3 __iomem *sw = fs->swim3; 678 int intr, err, n; 679 int stat, resid; 680 struct dbdma_regs __iomem *dr; 681 struct dbdma_cmd *cp; 682 unsigned long flags; 683 struct request *req = fs->cur_req; 684 685 swim3_dbg("* interrupt, state=%d\n", fs->state); 686 687 spin_lock_irqsave(&swim3_lock, flags); 688 intr = in_8(&sw->intr); 689 err = (intr & ERROR_INTR)? in_8(&sw->error): 0; 690 if ((intr & ERROR_INTR) && fs->state != do_transfer) 691 swim3_err("Non-transfer error interrupt: state=%d, dir=%x, intr=%x, err=%x\n", 692 fs->state, rq_data_dir(req), intr, err); 693 switch (fs->state) { 694 case locating: 695 if (intr & SEEN_SECTOR) { 696 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 697 out_8(&sw->select, RELAX); 698 out_8(&sw->intr_enable, 0); 699 del_timer(&fs->timeout); 700 fs->timeout_pending = 0; 701 if (sw->ctrack == 0xff) { 702 swim3_err("%s", "Seen sector but cyl=ff?\n"); 703 fs->cur_cyl = -1; 704 if (fs->retries > 5) { 705 swim3_end_request(fs, -EIO, 0); 706 fs->state = idle; 707 start_request(fs); 708 } else { 709 fs->state = jogging; 710 act(fs); 711 } 712 break; 713 } 714 fs->cur_cyl = sw->ctrack; 715 fs->cur_sector = sw->csect; 716 if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl) 717 swim3_err("Expected cyl %d, got %d\n", 718 fs->expect_cyl, fs->cur_cyl); 719 fs->state = do_transfer; 720 act(fs); 721 } 722 break; 723 case seeking: 724 case jogging: 725 if (sw->nseek == 0) { 726 out_8(&sw->control_bic, DO_SEEK); 727 out_8(&sw->select, RELAX); 728 out_8(&sw->intr_enable, 0); 729 del_timer(&fs->timeout); 730 fs->timeout_pending = 0; 731 if (fs->state == seeking) 732 ++fs->retries; 733 fs->state = settling; 734 act(fs); 735 } 736 break; 737 case settling: 738 out_8(&sw->intr_enable, 0); 739 del_timer(&fs->timeout); 740 fs->timeout_pending = 0; 741 act(fs); 742 break; 743 case do_transfer: 744 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0) 745 break; 746 out_8(&sw->intr_enable, 0); 747 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); 748 out_8(&sw->select, RELAX); 749 del_timer(&fs->timeout); 750 fs->timeout_pending = 0; 751 dr = fs->dma; 752 cp = fs->dma_cmd; 753 if (rq_data_dir(req) == WRITE) 754 ++cp; 755 /* 756 * Check that the main data transfer has finished. 757 * On writing, the swim3 sometimes doesn't use 758 * up all the bytes of the postamble, so we can still 759 * see DMA active here. That doesn't matter as long 760 * as all the sector data has been transferred. 761 */ 762 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) { 763 /* wait a little while for DMA to complete */ 764 for (n = 0; n < 100; ++n) { 765 if (cp->xfer_status != 0) 766 break; 767 udelay(1); 768 barrier(); 769 } 770 } 771 /* turn off DMA */ 772 out_le32(&dr->control, (RUN | PAUSE) << 16); 773 stat = ld_le16(&cp->xfer_status); 774 resid = ld_le16(&cp->res_count); 775 if (intr & ERROR_INTR) { 776 n = fs->scount - 1 - resid / 512; 777 if (n > 0) { 778 blk_update_request(req, 0, n << 9); 779 fs->req_sector += n; 780 } 781 if (fs->retries < 5) { 782 ++fs->retries; 783 act(fs); 784 } else { 785 swim3_err("Error %sing block %ld (err=%x)\n", 786 rq_data_dir(req) == WRITE? "writ": "read", 787 (long)blk_rq_pos(req), err); 788 swim3_end_request(fs, -EIO, 0); 789 fs->state = idle; 790 } 791 } else { 792 if ((stat & ACTIVE) == 0 || resid != 0) { 793 /* musta been an error */ 794 swim3_err("fd dma error: stat=%x resid=%d\n", stat, resid); 795 swim3_err(" state=%d, dir=%x, intr=%x, err=%x\n", 796 fs->state, rq_data_dir(req), intr, err); 797 swim3_end_request(fs, -EIO, 0); 798 fs->state = idle; 799 start_request(fs); 800 break; 801 } 802 fs->retries = 0; 803 if (swim3_end_request(fs, 0, fs->scount << 9)) { 804 fs->req_sector += fs->scount; 805 if (fs->req_sector > fs->secpertrack) { 806 fs->req_sector -= fs->secpertrack; 807 if (++fs->head > 1) { 808 fs->head = 0; 809 ++fs->req_cyl; 810 } 811 } 812 act(fs); 813 } else 814 fs->state = idle; 815 } 816 if (fs->state == idle) 817 start_request(fs); 818 break; 819 default: 820 swim3_err("Don't know what to do in state %d\n", fs->state); 821 } 822 spin_unlock_irqrestore(&swim3_lock, flags); 823 return IRQ_HANDLED; 824} 825 826/* 827static void fd_dma_interrupt(int irq, void *dev_id) 828{ 829} 830*/ 831 832/* Called under the mutex to grab exclusive access to a drive */ 833static int grab_drive(struct floppy_state *fs, enum swim_state state, 834 int interruptible) 835{ 836 unsigned long flags; 837 838 swim3_dbg("%s", "-> grab drive\n"); 839 840 spin_lock_irqsave(&swim3_lock, flags); 841 if (fs->state != idle && fs->state != available) { 842 ++fs->wanted; 843 while (fs->state != available) { 844 spin_unlock_irqrestore(&swim3_lock, flags); 845 if (interruptible && signal_pending(current)) { 846 --fs->wanted; 847 return -EINTR; 848 } 849 interruptible_sleep_on(&fs->wait); 850 spin_lock_irqsave(&swim3_lock, flags); 851 } 852 --fs->wanted; 853 } 854 fs->state = state; 855 spin_unlock_irqrestore(&swim3_lock, flags); 856 857 return 0; 858} 859 860static void release_drive(struct floppy_state *fs) 861{ 862 unsigned long flags; 863 864 swim3_dbg("%s", "-> release drive\n"); 865 866 spin_lock_irqsave(&swim3_lock, flags); 867 fs->state = idle; 868 start_request(fs); 869 spin_unlock_irqrestore(&swim3_lock, flags); 870} 871 872static int fd_eject(struct floppy_state *fs) 873{ 874 int err, n; 875 876 err = grab_drive(fs, ejecting, 1); 877 if (err) 878 return err; 879 swim3_action(fs, EJECT); 880 for (n = 20; n > 0; --n) { 881 if (signal_pending(current)) { 882 err = -EINTR; 883 break; 884 } 885 swim3_select(fs, RELAX); 886 schedule_timeout_interruptible(1); 887 if (swim3_readbit(fs, DISK_IN) == 0) 888 break; 889 } 890 swim3_select(fs, RELAX); 891 udelay(150); 892 fs->ejected = 1; 893 release_drive(fs); 894 return err; 895} 896 897static struct floppy_struct floppy_type = 898 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */ 899 900static int floppy_locked_ioctl(struct block_device *bdev, fmode_t mode, 901 unsigned int cmd, unsigned long param) 902{ 903 struct floppy_state *fs = bdev->bd_disk->private_data; 904 int err; 905 906 if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)) 907 return -EPERM; 908 909 if (fs->mdev->media_bay && 910 check_media_bay(fs->mdev->media_bay) != MB_FD) 911 return -ENXIO; 912 913 switch (cmd) { 914 case FDEJECT: 915 if (fs->ref_count != 1) 916 return -EBUSY; 917 err = fd_eject(fs); 918 return err; 919 case FDGETPRM: 920 if (copy_to_user((void __user *) param, &floppy_type, 921 sizeof(struct floppy_struct))) 922 return -EFAULT; 923 return 0; 924 } 925 return -ENOTTY; 926} 927 928static int floppy_ioctl(struct block_device *bdev, fmode_t mode, 929 unsigned int cmd, unsigned long param) 930{ 931 int ret; 932 933 mutex_lock(&swim3_mutex); 934 ret = floppy_locked_ioctl(bdev, mode, cmd, param); 935 mutex_unlock(&swim3_mutex); 936 937 return ret; 938} 939 940static int floppy_open(struct block_device *bdev, fmode_t mode) 941{ 942 struct floppy_state *fs = bdev->bd_disk->private_data; 943 struct swim3 __iomem *sw = fs->swim3; 944 int n, err = 0; 945 946 if (fs->ref_count == 0) { 947 if (fs->mdev->media_bay && 948 check_media_bay(fs->mdev->media_bay) != MB_FD) 949 return -ENXIO; 950 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2); 951 out_8(&sw->control_bic, 0xff); 952 out_8(&sw->mode, 0x95); 953 udelay(10); 954 out_8(&sw->intr_enable, 0); 955 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE); 956 swim3_action(fs, MOTOR_ON); 957 fs->write_prot = -1; 958 fs->cur_cyl = -1; 959 for (n = 0; n < 2 * HZ; ++n) { 960 if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE)) 961 break; 962 if (signal_pending(current)) { 963 err = -EINTR; 964 break; 965 } 966 swim3_select(fs, RELAX); 967 schedule_timeout_interruptible(1); 968 } 969 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0 970 || swim3_readbit(fs, DISK_IN) == 0)) 971 err = -ENXIO; 972 swim3_action(fs, SETMFM); 973 swim3_select(fs, RELAX); 974 975 } else if (fs->ref_count == -1 || mode & FMODE_EXCL) 976 return -EBUSY; 977 978 if (err == 0 && (mode & FMODE_NDELAY) == 0 979 && (mode & (FMODE_READ|FMODE_WRITE))) { 980 check_disk_change(bdev); 981 if (fs->ejected) 982 err = -ENXIO; 983 } 984 985 if (err == 0 && (mode & FMODE_WRITE)) { 986 if (fs->write_prot < 0) 987 fs->write_prot = swim3_readbit(fs, WRITE_PROT); 988 if (fs->write_prot) 989 err = -EROFS; 990 } 991 992 if (err) { 993 if (fs->ref_count == 0) { 994 swim3_action(fs, MOTOR_OFF); 995 out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE); 996 swim3_select(fs, RELAX); 997 } 998 return err; 999 } 1000 1001 if (mode & FMODE_EXCL) 1002 fs->ref_count = -1; 1003 else 1004 ++fs->ref_count; 1005 1006 return 0; 1007} 1008 1009static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode) 1010{ 1011 int ret; 1012 1013 mutex_lock(&swim3_mutex); 1014 ret = floppy_open(bdev, mode); 1015 mutex_unlock(&swim3_mutex); 1016 1017 return ret; 1018} 1019 1020static int floppy_release(struct gendisk *disk, fmode_t mode) 1021{ 1022 struct floppy_state *fs = disk->private_data; 1023 struct swim3 __iomem *sw = fs->swim3; 1024 1025 mutex_lock(&swim3_mutex); 1026 if (fs->ref_count > 0 && --fs->ref_count == 0) { 1027 swim3_action(fs, MOTOR_OFF); 1028 out_8(&sw->control_bic, 0xff); 1029 swim3_select(fs, RELAX); 1030 } 1031 mutex_unlock(&swim3_mutex); 1032 return 0; 1033} 1034 1035static unsigned int floppy_check_events(struct gendisk *disk, 1036 unsigned int clearing) 1037{ 1038 struct floppy_state *fs = disk->private_data; 1039 return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0; 1040} 1041 1042static int floppy_revalidate(struct gendisk *disk) 1043{ 1044 struct floppy_state *fs = disk->private_data; 1045 struct swim3 __iomem *sw; 1046 int ret, n; 1047 1048 if (fs->mdev->media_bay && 1049 check_media_bay(fs->mdev->media_bay) != MB_FD) 1050 return -ENXIO; 1051 1052 sw = fs->swim3; 1053 grab_drive(fs, revalidating, 0); 1054 out_8(&sw->intr_enable, 0); 1055 out_8(&sw->control_bis, DRIVE_ENABLE); 1056 swim3_action(fs, MOTOR_ON); /* necessary? */ 1057 fs->write_prot = -1; 1058 fs->cur_cyl = -1; 1059 mdelay(1); 1060 for (n = HZ; n > 0; --n) { 1061 if (swim3_readbit(fs, SEEK_COMPLETE)) 1062 break; 1063 if (signal_pending(current)) 1064 break; 1065 swim3_select(fs, RELAX); 1066 schedule_timeout_interruptible(1); 1067 } 1068 ret = swim3_readbit(fs, SEEK_COMPLETE) == 0 1069 || swim3_readbit(fs, DISK_IN) == 0; 1070 if (ret) 1071 swim3_action(fs, MOTOR_OFF); 1072 else { 1073 fs->ejected = 0; 1074 swim3_action(fs, SETMFM); 1075 } 1076 swim3_select(fs, RELAX); 1077 1078 release_drive(fs); 1079 return ret; 1080} 1081 1082static const struct block_device_operations floppy_fops = { 1083 .open = floppy_unlocked_open, 1084 .release = floppy_release, 1085 .ioctl = floppy_ioctl, 1086 .check_events = floppy_check_events, 1087 .revalidate_disk= floppy_revalidate, 1088}; 1089 1090static void swim3_mb_event(struct macio_dev* mdev, int mb_state) 1091{ 1092 struct floppy_state *fs = macio_get_drvdata(mdev); 1093 struct swim3 __iomem *sw = fs->swim3; 1094 1095 if (!fs) 1096 return; 1097 if (mb_state != MB_FD) 1098 return; 1099 1100 /* Clear state */ 1101 out_8(&sw->intr_enable, 0); 1102 in_8(&sw->intr); 1103 in_8(&sw->error); 1104} 1105 1106static int swim3_add_device(struct macio_dev *mdev, int index) 1107{ 1108 struct device_node *swim = mdev->ofdev.dev.of_node; 1109 struct floppy_state *fs = &floppy_states[index]; 1110 int rc = -EBUSY; 1111 1112 /* Do this first for message macros */ 1113 memset(fs, 0, sizeof(*fs)); 1114 fs->mdev = mdev; 1115 fs->index = index; 1116 1117 /* Check & Request resources */ 1118 if (macio_resource_count(mdev) < 2) { 1119 swim3_err("%s", "No address in device-tree\n"); 1120 return -ENXIO; 1121 } 1122 if (macio_irq_count(mdev) < 1) { 1123 swim3_err("%s", "No interrupt in device-tree\n"); 1124 return -ENXIO; 1125 } 1126 if (macio_request_resource(mdev, 0, "swim3 (mmio)")) { 1127 swim3_err("%s", "Can't request mmio resource\n"); 1128 return -EBUSY; 1129 } 1130 if (macio_request_resource(mdev, 1, "swim3 (dma)")) { 1131 swim3_err("%s", "Can't request dma resource\n"); 1132 macio_release_resource(mdev, 0); 1133 return -EBUSY; 1134 } 1135 dev_set_drvdata(&mdev->ofdev.dev, fs); 1136 1137 if (mdev->media_bay == NULL) 1138 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1); 1139 1140 fs->state = idle; 1141 fs->swim3 = (struct swim3 __iomem *) 1142 ioremap(macio_resource_start(mdev, 0), 0x200); 1143 if (fs->swim3 == NULL) { 1144 swim3_err("%s", "Couldn't map mmio registers\n"); 1145 rc = -ENOMEM; 1146 goto out_release; 1147 } 1148 fs->dma = (struct dbdma_regs __iomem *) 1149 ioremap(macio_resource_start(mdev, 1), 0x200); 1150 if (fs->dma == NULL) { 1151 swim3_err("%s", "Couldn't map dma registers\n"); 1152 iounmap(fs->swim3); 1153 rc = -ENOMEM; 1154 goto out_release; 1155 } 1156 fs->swim3_intr = macio_irq(mdev, 0); 1157 fs->dma_intr = macio_irq(mdev, 1); 1158 fs->cur_cyl = -1; 1159 fs->cur_sector = -1; 1160 fs->secpercyl = 36; 1161 fs->secpertrack = 18; 1162 fs->total_secs = 2880; 1163 init_waitqueue_head(&fs->wait); 1164 1165 fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space); 1166 memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd)); 1167 st_le16(&fs->dma_cmd[1].command, DBDMA_STOP); 1168 1169 if (mdev->media_bay == NULL || check_media_bay(mdev->media_bay) == MB_FD) 1170 swim3_mb_event(mdev, MB_FD); 1171 1172 if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) { 1173 swim3_err("%s", "Couldn't request interrupt\n"); 1174 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0); 1175 goto out_unmap; 1176 return -EBUSY; 1177 } 1178 1179 init_timer(&fs->timeout); 1180 1181 swim3_info("SWIM3 floppy controller %s\n", 1182 mdev->media_bay ? "in media bay" : ""); 1183 1184 return 0; 1185 1186 out_unmap: 1187 iounmap(fs->dma); 1188 iounmap(fs->swim3); 1189 1190 out_release: 1191 macio_release_resource(mdev, 0); 1192 macio_release_resource(mdev, 1); 1193 1194 return rc; 1195} 1196 1197static int __devinit swim3_attach(struct macio_dev *mdev, const struct of_device_id *match) 1198{ 1199 struct gendisk *disk; 1200 int index, rc; 1201 1202 index = floppy_count++; 1203 if (index >= MAX_FLOPPIES) 1204 return -ENXIO; 1205 1206 /* Add the drive */ 1207 rc = swim3_add_device(mdev, index); 1208 if (rc) 1209 return rc; 1210 /* Now register that disk. Same comment about failure handling */ 1211 disk = disks[index] = alloc_disk(1); 1212 if (disk == NULL) 1213 return -ENOMEM; 1214 disk->queue = blk_init_queue(do_fd_request, &swim3_lock); 1215 if (disk->queue == NULL) { 1216 put_disk(disk); 1217 return -ENOMEM; 1218 } 1219 disk->queue->queuedata = &floppy_states[index]; 1220 1221 if (index == 0) { 1222 /* If we failed, there isn't much we can do as the driver is still 1223 * too dumb to remove the device, just bail out 1224 */ 1225 if (register_blkdev(FLOPPY_MAJOR, "fd")) 1226 return 0; 1227 } 1228 1229 disk->major = FLOPPY_MAJOR; 1230 disk->first_minor = index; 1231 disk->fops = &floppy_fops; 1232 disk->private_data = &floppy_states[index]; 1233 disk->flags |= GENHD_FL_REMOVABLE; 1234 sprintf(disk->disk_name, "fd%d", index); 1235 set_capacity(disk, 2880); 1236 add_disk(disk); 1237 1238 return 0; 1239} 1240 1241static struct of_device_id swim3_match[] = 1242{ 1243 { 1244 .name = "swim3", 1245 }, 1246 { 1247 .compatible = "ohare-swim3" 1248 }, 1249 { 1250 .compatible = "swim3" 1251 }, 1252 { /* end of list */ } 1253}; 1254 1255static struct macio_driver swim3_driver = 1256{ 1257 .driver = { 1258 .name = "swim3", 1259 .of_match_table = swim3_match, 1260 }, 1261 .probe = swim3_attach, 1262#ifdef CONFIG_PMAC_MEDIABAY 1263 .mediabay_event = swim3_mb_event, 1264#endif 1265#if 0 1266 .suspend = swim3_suspend, 1267 .resume = swim3_resume, 1268#endif 1269}; 1270 1271 1272int swim3_init(void) 1273{ 1274 macio_register_driver(&swim3_driver); 1275 return 0; 1276} 1277 1278module_init(swim3_init) 1279 1280MODULE_LICENSE("GPL"); 1281MODULE_AUTHOR("Paul Mackerras"); 1282MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR); 1283