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/signal.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 <linux/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 ONEMEG_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 GCR_MODE 13 160 #define SEEK_COMPLETE 14 161 #define TWOMEG_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(struct timer_list *t); 243 static void seek_timeout(struct timer_list *t); 244 static void settle_timeout(struct timer_list *t); 245 static void xfer_timeout(struct timer_list *t); 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, blk_status_t 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, BLK_STS_IOERR, 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(" current_nr_sectors=%u\n", 347 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, BLK_STS_IOERR, 0); 354 continue; 355 } 356 if (fs->ejected) { 357 swim3_dbg("%s", " disk ejected\n"); 358 swim3_end_request(fs, BLK_STS_IOERR, 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, BLK_STS_IOERR, 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)(struct timer_list *t)) 396 { 397 if (fs->timeout_pending) 398 del_timer(&fs->timeout); 399 fs->timeout.expires = jiffies + nticks; 400 fs->timeout.function = proc; 401 add_timer(&fs->timeout); 402 fs->timeout_pending = 1; 403 } 404 405 static 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 } 417 418 static 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 } 438 439 static inline void init_dma(struct dbdma_cmd *cp, int cmd, 440 void *buf, int count) 441 { 442 cp->req_count = cpu_to_le16(count); 443 cp->command = cpu_to_le16(cmd); 444 cp->phy_addr = cpu_to_le32(virt_to_bus(buf)); 445 cp->xfer_status = 0; 446 } 447 448 static 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, bio_data(req->bio), 512); 482 ++cp; 483 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble)); 484 } else { 485 init_dma(cp, INPUT_LAST, bio_data(req->bio), 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 } 501 502 static 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, BLK_STS_IOERR, 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 } 570 571 static void scan_timeout(struct timer_list *t) 572 { 573 struct floppy_state *fs = from_timer(fs, t, timeout); 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, BLK_STS_IOERR, 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 } 595 596 static void seek_timeout(struct timer_list *t) 597 { 598 struct floppy_state *fs = from_timer(fs, t, timeout); 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, BLK_STS_IOERR, 0); 611 fs->state = idle; 612 start_request(fs); 613 spin_unlock_irqrestore(&swim3_lock, flags); 614 } 615 616 static void settle_timeout(struct timer_list *t) 617 { 618 struct floppy_state *fs = from_timer(fs, t, timeout); 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, BLK_STS_IOERR, 0); 640 fs->state = idle; 641 start_request(fs); 642 unlock: 643 spin_unlock_irqrestore(&swim3_lock, flags); 644 } 645 646 static void xfer_timeout(struct timer_list *t) 647 { 648 struct floppy_state *fs = from_timer(fs, t, timeout); 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, BLK_STS_IOERR, 0); 669 fs->state = idle; 670 start_request(fs); 671 spin_unlock_irqrestore(&swim3_lock, flags); 672 } 673 674 static 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, BLK_STS_IOERR, 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 = le16_to_cpu(cp->xfer_status); 774 resid = le16_to_cpu(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, BLK_STS_IOERR, 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, BLK_STS_IOERR, 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 /* 827 static 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 */ 833 static 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 /* this will enable irqs in order to sleep */ 844 if (!interruptible) 845 wait_event_lock_irq(fs->wait, 846 fs->state == available, 847 swim3_lock); 848 else if (wait_event_interruptible_lock_irq(fs->wait, 849 fs->state == available, 850 swim3_lock)) { 851 --fs->wanted; 852 spin_unlock_irqrestore(&swim3_lock, flags); 853 return -EINTR; 854 } 855 --fs->wanted; 856 } 857 fs->state = state; 858 spin_unlock_irqrestore(&swim3_lock, flags); 859 860 return 0; 861 } 862 863 static void release_drive(struct floppy_state *fs) 864 { 865 unsigned long flags; 866 867 swim3_dbg("%s", "-> release drive\n"); 868 869 spin_lock_irqsave(&swim3_lock, flags); 870 fs->state = idle; 871 start_request(fs); 872 spin_unlock_irqrestore(&swim3_lock, flags); 873 } 874 875 static int fd_eject(struct floppy_state *fs) 876 { 877 int err, n; 878 879 err = grab_drive(fs, ejecting, 1); 880 if (err) 881 return err; 882 swim3_action(fs, EJECT); 883 for (n = 20; n > 0; --n) { 884 if (signal_pending(current)) { 885 err = -EINTR; 886 break; 887 } 888 swim3_select(fs, RELAX); 889 schedule_timeout_interruptible(1); 890 if (swim3_readbit(fs, DISK_IN) == 0) 891 break; 892 } 893 swim3_select(fs, RELAX); 894 udelay(150); 895 fs->ejected = 1; 896 release_drive(fs); 897 return err; 898 } 899 900 static struct floppy_struct floppy_type = 901 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */ 902 903 static int floppy_locked_ioctl(struct block_device *bdev, fmode_t mode, 904 unsigned int cmd, unsigned long param) 905 { 906 struct floppy_state *fs = bdev->bd_disk->private_data; 907 int err; 908 909 if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)) 910 return -EPERM; 911 912 if (fs->mdev->media_bay && 913 check_media_bay(fs->mdev->media_bay) != MB_FD) 914 return -ENXIO; 915 916 switch (cmd) { 917 case FDEJECT: 918 if (fs->ref_count != 1) 919 return -EBUSY; 920 err = fd_eject(fs); 921 return err; 922 case FDGETPRM: 923 if (copy_to_user((void __user *) param, &floppy_type, 924 sizeof(struct floppy_struct))) 925 return -EFAULT; 926 return 0; 927 } 928 return -ENOTTY; 929 } 930 931 static int floppy_ioctl(struct block_device *bdev, fmode_t mode, 932 unsigned int cmd, unsigned long param) 933 { 934 int ret; 935 936 mutex_lock(&swim3_mutex); 937 ret = floppy_locked_ioctl(bdev, mode, cmd, param); 938 mutex_unlock(&swim3_mutex); 939 940 return ret; 941 } 942 943 static int floppy_open(struct block_device *bdev, fmode_t mode) 944 { 945 struct floppy_state *fs = bdev->bd_disk->private_data; 946 struct swim3 __iomem *sw = fs->swim3; 947 int n, err = 0; 948 949 if (fs->ref_count == 0) { 950 if (fs->mdev->media_bay && 951 check_media_bay(fs->mdev->media_bay) != MB_FD) 952 return -ENXIO; 953 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2); 954 out_8(&sw->control_bic, 0xff); 955 out_8(&sw->mode, 0x95); 956 udelay(10); 957 out_8(&sw->intr_enable, 0); 958 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE); 959 swim3_action(fs, MOTOR_ON); 960 fs->write_prot = -1; 961 fs->cur_cyl = -1; 962 for (n = 0; n < 2 * HZ; ++n) { 963 if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE)) 964 break; 965 if (signal_pending(current)) { 966 err = -EINTR; 967 break; 968 } 969 swim3_select(fs, RELAX); 970 schedule_timeout_interruptible(1); 971 } 972 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0 973 || swim3_readbit(fs, DISK_IN) == 0)) 974 err = -ENXIO; 975 swim3_action(fs, SETMFM); 976 swim3_select(fs, RELAX); 977 978 } else if (fs->ref_count == -1 || mode & FMODE_EXCL) 979 return -EBUSY; 980 981 if (err == 0 && (mode & FMODE_NDELAY) == 0 982 && (mode & (FMODE_READ|FMODE_WRITE))) { 983 check_disk_change(bdev); 984 if (fs->ejected) 985 err = -ENXIO; 986 } 987 988 if (err == 0 && (mode & FMODE_WRITE)) { 989 if (fs->write_prot < 0) 990 fs->write_prot = swim3_readbit(fs, WRITE_PROT); 991 if (fs->write_prot) 992 err = -EROFS; 993 } 994 995 if (err) { 996 if (fs->ref_count == 0) { 997 swim3_action(fs, MOTOR_OFF); 998 out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE); 999 swim3_select(fs, RELAX); 1000 } 1001 return err; 1002 } 1003 1004 if (mode & FMODE_EXCL) 1005 fs->ref_count = -1; 1006 else 1007 ++fs->ref_count; 1008 1009 return 0; 1010 } 1011 1012 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode) 1013 { 1014 int ret; 1015 1016 mutex_lock(&swim3_mutex); 1017 ret = floppy_open(bdev, mode); 1018 mutex_unlock(&swim3_mutex); 1019 1020 return ret; 1021 } 1022 1023 static void floppy_release(struct gendisk *disk, fmode_t mode) 1024 { 1025 struct floppy_state *fs = disk->private_data; 1026 struct swim3 __iomem *sw = fs->swim3; 1027 1028 mutex_lock(&swim3_mutex); 1029 if (fs->ref_count > 0 && --fs->ref_count == 0) { 1030 swim3_action(fs, MOTOR_OFF); 1031 out_8(&sw->control_bic, 0xff); 1032 swim3_select(fs, RELAX); 1033 } 1034 mutex_unlock(&swim3_mutex); 1035 } 1036 1037 static unsigned int floppy_check_events(struct gendisk *disk, 1038 unsigned int clearing) 1039 { 1040 struct floppy_state *fs = disk->private_data; 1041 return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0; 1042 } 1043 1044 static int floppy_revalidate(struct gendisk *disk) 1045 { 1046 struct floppy_state *fs = disk->private_data; 1047 struct swim3 __iomem *sw; 1048 int ret, n; 1049 1050 if (fs->mdev->media_bay && 1051 check_media_bay(fs->mdev->media_bay) != MB_FD) 1052 return -ENXIO; 1053 1054 sw = fs->swim3; 1055 grab_drive(fs, revalidating, 0); 1056 out_8(&sw->intr_enable, 0); 1057 out_8(&sw->control_bis, DRIVE_ENABLE); 1058 swim3_action(fs, MOTOR_ON); /* necessary? */ 1059 fs->write_prot = -1; 1060 fs->cur_cyl = -1; 1061 mdelay(1); 1062 for (n = HZ; n > 0; --n) { 1063 if (swim3_readbit(fs, SEEK_COMPLETE)) 1064 break; 1065 if (signal_pending(current)) 1066 break; 1067 swim3_select(fs, RELAX); 1068 schedule_timeout_interruptible(1); 1069 } 1070 ret = swim3_readbit(fs, SEEK_COMPLETE) == 0 1071 || swim3_readbit(fs, DISK_IN) == 0; 1072 if (ret) 1073 swim3_action(fs, MOTOR_OFF); 1074 else { 1075 fs->ejected = 0; 1076 swim3_action(fs, SETMFM); 1077 } 1078 swim3_select(fs, RELAX); 1079 1080 release_drive(fs); 1081 return ret; 1082 } 1083 1084 static const struct block_device_operations floppy_fops = { 1085 .open = floppy_unlocked_open, 1086 .release = floppy_release, 1087 .ioctl = floppy_ioctl, 1088 .check_events = floppy_check_events, 1089 .revalidate_disk= floppy_revalidate, 1090 }; 1091 1092 static void swim3_mb_event(struct macio_dev* mdev, int mb_state) 1093 { 1094 struct floppy_state *fs = macio_get_drvdata(mdev); 1095 struct swim3 __iomem *sw; 1096 1097 if (!fs) 1098 return; 1099 1100 sw = fs->swim3; 1101 1102 if (mb_state != MB_FD) 1103 return; 1104 1105 /* Clear state */ 1106 out_8(&sw->intr_enable, 0); 1107 in_8(&sw->intr); 1108 in_8(&sw->error); 1109 } 1110 1111 static int swim3_add_device(struct macio_dev *mdev, int index) 1112 { 1113 struct device_node *swim = mdev->ofdev.dev.of_node; 1114 struct floppy_state *fs = &floppy_states[index]; 1115 int rc = -EBUSY; 1116 1117 /* Do this first for message macros */ 1118 memset(fs, 0, sizeof(*fs)); 1119 fs->mdev = mdev; 1120 fs->index = index; 1121 1122 /* Check & Request resources */ 1123 if (macio_resource_count(mdev) < 2) { 1124 swim3_err("%s", "No address in device-tree\n"); 1125 return -ENXIO; 1126 } 1127 if (macio_irq_count(mdev) < 1) { 1128 swim3_err("%s", "No interrupt in device-tree\n"); 1129 return -ENXIO; 1130 } 1131 if (macio_request_resource(mdev, 0, "swim3 (mmio)")) { 1132 swim3_err("%s", "Can't request mmio resource\n"); 1133 return -EBUSY; 1134 } 1135 if (macio_request_resource(mdev, 1, "swim3 (dma)")) { 1136 swim3_err("%s", "Can't request dma resource\n"); 1137 macio_release_resource(mdev, 0); 1138 return -EBUSY; 1139 } 1140 dev_set_drvdata(&mdev->ofdev.dev, fs); 1141 1142 if (mdev->media_bay == NULL) 1143 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1); 1144 1145 fs->state = idle; 1146 fs->swim3 = (struct swim3 __iomem *) 1147 ioremap(macio_resource_start(mdev, 0), 0x200); 1148 if (fs->swim3 == NULL) { 1149 swim3_err("%s", "Couldn't map mmio registers\n"); 1150 rc = -ENOMEM; 1151 goto out_release; 1152 } 1153 fs->dma = (struct dbdma_regs __iomem *) 1154 ioremap(macio_resource_start(mdev, 1), 0x200); 1155 if (fs->dma == NULL) { 1156 swim3_err("%s", "Couldn't map dma registers\n"); 1157 iounmap(fs->swim3); 1158 rc = -ENOMEM; 1159 goto out_release; 1160 } 1161 fs->swim3_intr = macio_irq(mdev, 0); 1162 fs->dma_intr = macio_irq(mdev, 1); 1163 fs->cur_cyl = -1; 1164 fs->cur_sector = -1; 1165 fs->secpercyl = 36; 1166 fs->secpertrack = 18; 1167 fs->total_secs = 2880; 1168 init_waitqueue_head(&fs->wait); 1169 1170 fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space); 1171 memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd)); 1172 fs->dma_cmd[1].command = cpu_to_le16(DBDMA_STOP); 1173 1174 if (mdev->media_bay == NULL || check_media_bay(mdev->media_bay) == MB_FD) 1175 swim3_mb_event(mdev, MB_FD); 1176 1177 if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) { 1178 swim3_err("%s", "Couldn't request interrupt\n"); 1179 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0); 1180 goto out_unmap; 1181 return -EBUSY; 1182 } 1183 1184 timer_setup(&fs->timeout, NULL, 0); 1185 1186 swim3_info("SWIM3 floppy controller %s\n", 1187 mdev->media_bay ? "in media bay" : ""); 1188 1189 return 0; 1190 1191 out_unmap: 1192 iounmap(fs->dma); 1193 iounmap(fs->swim3); 1194 1195 out_release: 1196 macio_release_resource(mdev, 0); 1197 macio_release_resource(mdev, 1); 1198 1199 return rc; 1200 } 1201 1202 static int swim3_attach(struct macio_dev *mdev, 1203 const struct of_device_id *match) 1204 { 1205 struct gendisk *disk; 1206 int index, rc; 1207 1208 index = floppy_count++; 1209 if (index >= MAX_FLOPPIES) 1210 return -ENXIO; 1211 1212 /* Add the drive */ 1213 rc = swim3_add_device(mdev, index); 1214 if (rc) 1215 return rc; 1216 /* Now register that disk. Same comment about failure handling */ 1217 disk = disks[index] = alloc_disk(1); 1218 if (disk == NULL) 1219 return -ENOMEM; 1220 disk->queue = blk_init_queue(do_fd_request, &swim3_lock); 1221 if (disk->queue == NULL) { 1222 put_disk(disk); 1223 return -ENOMEM; 1224 } 1225 blk_queue_bounce_limit(disk->queue, BLK_BOUNCE_HIGH); 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 const 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