1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Driver for the SWIM3 (Super Woz Integrated Machine 3) 4 * floppy controller found on Power Macintoshes. 5 * 6 * Copyright (C) 1996 Paul Mackerras. 7 */ 8 9 /* 10 * TODO: 11 * handle 2 drives 12 * handle GCR disks 13 */ 14 15 #undef DEBUG 16 17 #include <linux/stddef.h> 18 #include <linux/kernel.h> 19 #include <linux/sched/signal.h> 20 #include <linux/timer.h> 21 #include <linux/delay.h> 22 #include <linux/fd.h> 23 #include <linux/ioctl.h> 24 #include <linux/blk-mq.h> 25 #include <linux/interrupt.h> 26 #include <linux/mutex.h> 27 #include <linux/module.h> 28 #include <linux/spinlock.h> 29 #include <linux/wait.h> 30 #include <asm/io.h> 31 #include <asm/dbdma.h> 32 #include <asm/prom.h> 33 #include <linux/uaccess.h> 34 #include <asm/mediabay.h> 35 #include <asm/machdep.h> 36 #include <asm/pmac_feature.h> 37 38 #define MAX_FLOPPIES 2 39 40 static DEFINE_MUTEX(swim3_mutex); 41 static struct gendisk *disks[MAX_FLOPPIES]; 42 43 enum swim_state { 44 idle, 45 locating, 46 seeking, 47 settling, 48 do_transfer, 49 jogging, 50 available, 51 revalidating, 52 ejecting 53 }; 54 55 #define REG(x) unsigned char x; char x ## _pad[15]; 56 57 /* 58 * The names for these registers mostly represent speculation on my part. 59 * It will be interesting to see how close they are to the names Apple uses. 60 */ 61 struct swim3 { 62 REG(data); 63 REG(timer); /* counts down at 1MHz */ 64 REG(error); 65 REG(mode); 66 REG(select); /* controls CA0, CA1, CA2 and LSTRB signals */ 67 REG(setup); 68 REG(control); /* writing bits clears them */ 69 REG(status); /* writing bits sets them in control */ 70 REG(intr); 71 REG(nseek); /* # tracks to seek */ 72 REG(ctrack); /* current track number */ 73 REG(csect); /* current sector number */ 74 REG(gap3); /* size of gap 3 in track format */ 75 REG(sector); /* sector # to read or write */ 76 REG(nsect); /* # sectors to read or write */ 77 REG(intr_enable); 78 }; 79 80 #define control_bic control 81 #define control_bis status 82 83 /* Bits in select register */ 84 #define CA_MASK 7 85 #define LSTRB 8 86 87 /* Bits in control register */ 88 #define DO_SEEK 0x80 89 #define FORMAT 0x40 90 #define SELECT 0x20 91 #define WRITE_SECTORS 0x10 92 #define DO_ACTION 0x08 93 #define DRIVE2_ENABLE 0x04 94 #define DRIVE_ENABLE 0x02 95 #define INTR_ENABLE 0x01 96 97 /* Bits in status register */ 98 #define FIFO_1BYTE 0x80 99 #define FIFO_2BYTE 0x40 100 #define ERROR 0x20 101 #define DATA 0x08 102 #define RDDATA 0x04 103 #define INTR_PENDING 0x02 104 #define MARK_BYTE 0x01 105 106 /* Bits in intr and intr_enable registers */ 107 #define ERROR_INTR 0x20 108 #define DATA_CHANGED 0x10 109 #define TRANSFER_DONE 0x08 110 #define SEEN_SECTOR 0x04 111 #define SEEK_DONE 0x02 112 #define TIMER_DONE 0x01 113 114 /* Bits in error register */ 115 #define ERR_DATA_CRC 0x80 116 #define ERR_ADDR_CRC 0x40 117 #define ERR_OVERRUN 0x04 118 #define ERR_UNDERRUN 0x01 119 120 /* Bits in setup register */ 121 #define S_SW_RESET 0x80 122 #define S_GCR_WRITE 0x40 123 #define S_IBM_DRIVE 0x20 124 #define S_TEST_MODE 0x10 125 #define S_FCLK_DIV2 0x08 126 #define S_GCR 0x04 127 #define S_COPY_PROT 0x02 128 #define S_INV_WDATA 0x01 129 130 /* Select values for swim3_action */ 131 #define SEEK_POSITIVE 0 132 #define SEEK_NEGATIVE 4 133 #define STEP 1 134 #define MOTOR_ON 2 135 #define MOTOR_OFF 6 136 #define INDEX 3 137 #define EJECT 7 138 #define SETMFM 9 139 #define SETGCR 13 140 141 /* Select values for swim3_select and swim3_readbit */ 142 #define STEP_DIR 0 143 #define STEPPING 1 144 #define MOTOR_ON 2 145 #define RELAX 3 /* also eject in progress */ 146 #define READ_DATA_0 4 147 #define ONEMEG_DRIVE 5 148 #define SINGLE_SIDED 6 /* drive or diskette is 4MB type? */ 149 #define DRIVE_PRESENT 7 150 #define DISK_IN 8 151 #define WRITE_PROT 9 152 #define TRACK_ZERO 10 153 #define TACHO 11 154 #define READ_DATA_1 12 155 #define GCR_MODE 13 156 #define SEEK_COMPLETE 14 157 #define TWOMEG_MEDIA 15 158 159 /* Definitions of values used in writing and formatting */ 160 #define DATA_ESCAPE 0x99 161 #define GCR_SYNC_EXC 0x3f 162 #define GCR_SYNC_CONV 0x80 163 #define GCR_FIRST_MARK 0xd5 164 #define GCR_SECOND_MARK 0xaa 165 #define GCR_ADDR_MARK "\xd5\xaa\x00" 166 #define GCR_DATA_MARK "\xd5\xaa\x0b" 167 #define GCR_SLIP_BYTE "\x27\xaa" 168 #define GCR_SELF_SYNC "\x3f\xbf\x1e\x34\x3c\x3f" 169 170 #define DATA_99 "\x99\x99" 171 #define MFM_ADDR_MARK "\x99\xa1\x99\xa1\x99\xa1\x99\xfe" 172 #define MFM_INDEX_MARK "\x99\xc2\x99\xc2\x99\xc2\x99\xfc" 173 #define MFM_GAP_LEN 12 174 175 struct floppy_state { 176 enum swim_state state; 177 struct swim3 __iomem *swim3; /* hardware registers */ 178 struct dbdma_regs __iomem *dma; /* DMA controller registers */ 179 int swim3_intr; /* interrupt number for SWIM3 */ 180 int dma_intr; /* interrupt number for DMA channel */ 181 int cur_cyl; /* cylinder head is on, or -1 */ 182 int cur_sector; /* last sector we saw go past */ 183 int req_cyl; /* the cylinder for the current r/w request */ 184 int head; /* head number ditto */ 185 int req_sector; /* sector number ditto */ 186 int scount; /* # sectors we're transferring at present */ 187 int retries; 188 int settle_time; 189 int secpercyl; /* disk geometry information */ 190 int secpertrack; 191 int total_secs; 192 int write_prot; /* 1 if write-protected, 0 if not, -1 dunno */ 193 struct dbdma_cmd *dma_cmd; 194 int ref_count; 195 int expect_cyl; 196 struct timer_list timeout; 197 int timeout_pending; 198 int ejected; 199 wait_queue_head_t wait; 200 int wanted; 201 struct macio_dev *mdev; 202 char dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)]; 203 int index; 204 struct request *cur_req; 205 struct blk_mq_tag_set tag_set; 206 }; 207 208 #define swim3_err(fmt, arg...) dev_err(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) 209 #define swim3_warn(fmt, arg...) dev_warn(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) 210 #define swim3_info(fmt, arg...) dev_info(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) 211 212 #ifdef DEBUG 213 #define swim3_dbg(fmt, arg...) dev_dbg(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) 214 #else 215 #define swim3_dbg(fmt, arg...) do { } while(0) 216 #endif 217 218 static struct floppy_state floppy_states[MAX_FLOPPIES]; 219 static int floppy_count = 0; 220 static DEFINE_SPINLOCK(swim3_lock); 221 222 static unsigned short write_preamble[] = { 223 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */ 224 0, 0, 0, 0, 0, 0, /* sync field */ 225 0x99a1, 0x99a1, 0x99a1, 0x99fb, /* data address mark */ 226 0x990f /* no escape for 512 bytes */ 227 }; 228 229 static unsigned short write_postamble[] = { 230 0x9904, /* insert CRC */ 231 0x4e4e, 0x4e4e, 232 0x9908, /* stop writing */ 233 0, 0, 0, 0, 0, 0 234 }; 235 236 static void seek_track(struct floppy_state *fs, int n); 237 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count); 238 static void act(struct floppy_state *fs); 239 static void scan_timeout(struct timer_list *t); 240 static void seek_timeout(struct timer_list *t); 241 static void settle_timeout(struct timer_list *t); 242 static void xfer_timeout(struct timer_list *t); 243 static irqreturn_t swim3_interrupt(int irq, void *dev_id); 244 /*static void fd_dma_interrupt(int irq, void *dev_id);*/ 245 static int grab_drive(struct floppy_state *fs, enum swim_state state, 246 int interruptible); 247 static void release_drive(struct floppy_state *fs); 248 static int fd_eject(struct floppy_state *fs); 249 static int floppy_ioctl(struct block_device *bdev, fmode_t mode, 250 unsigned int cmd, unsigned long param); 251 static int floppy_open(struct block_device *bdev, fmode_t mode); 252 static void floppy_release(struct gendisk *disk, fmode_t mode); 253 static unsigned int floppy_check_events(struct gendisk *disk, 254 unsigned int clearing); 255 static int floppy_revalidate(struct gendisk *disk); 256 257 static bool swim3_end_request(struct floppy_state *fs, blk_status_t err, unsigned int nr_bytes) 258 { 259 struct request *req = fs->cur_req; 260 261 swim3_dbg(" end request, err=%d nr_bytes=%d, cur_req=%p\n", 262 err, nr_bytes, req); 263 264 if (err) 265 nr_bytes = blk_rq_cur_bytes(req); 266 if (blk_update_request(req, err, nr_bytes)) 267 return true; 268 __blk_mq_end_request(req, err); 269 fs->cur_req = NULL; 270 return false; 271 } 272 273 static void swim3_select(struct floppy_state *fs, int sel) 274 { 275 struct swim3 __iomem *sw = fs->swim3; 276 277 out_8(&sw->select, RELAX); 278 if (sel & 8) 279 out_8(&sw->control_bis, SELECT); 280 else 281 out_8(&sw->control_bic, SELECT); 282 out_8(&sw->select, sel & CA_MASK); 283 } 284 285 static void swim3_action(struct floppy_state *fs, int action) 286 { 287 struct swim3 __iomem *sw = fs->swim3; 288 289 swim3_select(fs, action); 290 udelay(1); 291 out_8(&sw->select, sw->select | LSTRB); 292 udelay(2); 293 out_8(&sw->select, sw->select & ~LSTRB); 294 udelay(1); 295 } 296 297 static int swim3_readbit(struct floppy_state *fs, int bit) 298 { 299 struct swim3 __iomem *sw = fs->swim3; 300 int stat; 301 302 swim3_select(fs, bit); 303 udelay(1); 304 stat = in_8(&sw->status); 305 return (stat & DATA) == 0; 306 } 307 308 static blk_status_t swim3_queue_rq(struct blk_mq_hw_ctx *hctx, 309 const struct blk_mq_queue_data *bd) 310 { 311 struct floppy_state *fs = hctx->queue->queuedata; 312 struct request *req = bd->rq; 313 unsigned long x; 314 315 spin_lock_irq(&swim3_lock); 316 if (fs->cur_req || fs->state != idle) { 317 spin_unlock_irq(&swim3_lock); 318 return BLK_STS_DEV_RESOURCE; 319 } 320 blk_mq_start_request(req); 321 fs->cur_req = req; 322 if (fs->mdev->media_bay && 323 check_media_bay(fs->mdev->media_bay) != MB_FD) { 324 swim3_dbg("%s", " media bay absent, dropping req\n"); 325 swim3_end_request(fs, BLK_STS_IOERR, 0); 326 goto out; 327 } 328 if (fs->ejected) { 329 swim3_dbg("%s", " disk ejected\n"); 330 swim3_end_request(fs, BLK_STS_IOERR, 0); 331 goto out; 332 } 333 if (rq_data_dir(req) == WRITE) { 334 if (fs->write_prot < 0) 335 fs->write_prot = swim3_readbit(fs, WRITE_PROT); 336 if (fs->write_prot) { 337 swim3_dbg("%s", " try to write, disk write protected\n"); 338 swim3_end_request(fs, BLK_STS_IOERR, 0); 339 goto out; 340 } 341 } 342 343 /* 344 * Do not remove the cast. blk_rq_pos(req) is now a sector_t and can be 345 * 64 bits, but it will never go past 32 bits for this driver anyway, so 346 * we can safely cast it down and not have to do a 64/32 division 347 */ 348 fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl; 349 x = ((long)blk_rq_pos(req)) % fs->secpercyl; 350 fs->head = x / fs->secpertrack; 351 fs->req_sector = x % fs->secpertrack + 1; 352 fs->state = do_transfer; 353 fs->retries = 0; 354 355 act(fs); 356 357 out: 358 spin_unlock_irq(&swim3_lock); 359 return BLK_STS_OK; 360 } 361 362 static void set_timeout(struct floppy_state *fs, int nticks, 363 void (*proc)(struct timer_list *t)) 364 { 365 if (fs->timeout_pending) 366 del_timer(&fs->timeout); 367 fs->timeout.expires = jiffies + nticks; 368 fs->timeout.function = proc; 369 add_timer(&fs->timeout); 370 fs->timeout_pending = 1; 371 } 372 373 static inline void scan_track(struct floppy_state *fs) 374 { 375 struct swim3 __iomem *sw = fs->swim3; 376 377 swim3_select(fs, READ_DATA_0); 378 in_8(&sw->intr); /* clear SEEN_SECTOR bit */ 379 in_8(&sw->error); 380 out_8(&sw->intr_enable, SEEN_SECTOR); 381 out_8(&sw->control_bis, DO_ACTION); 382 /* enable intr when track found */ 383 set_timeout(fs, HZ, scan_timeout); /* enable timeout */ 384 } 385 386 static inline void seek_track(struct floppy_state *fs, int n) 387 { 388 struct swim3 __iomem *sw = fs->swim3; 389 390 if (n >= 0) { 391 swim3_action(fs, SEEK_POSITIVE); 392 sw->nseek = n; 393 } else { 394 swim3_action(fs, SEEK_NEGATIVE); 395 sw->nseek = -n; 396 } 397 fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1; 398 swim3_select(fs, STEP); 399 in_8(&sw->error); 400 /* enable intr when seek finished */ 401 out_8(&sw->intr_enable, SEEK_DONE); 402 out_8(&sw->control_bis, DO_SEEK); 403 set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */ 404 fs->settle_time = 0; 405 } 406 407 static inline void init_dma(struct dbdma_cmd *cp, int cmd, 408 void *buf, int count) 409 { 410 cp->req_count = cpu_to_le16(count); 411 cp->command = cpu_to_le16(cmd); 412 cp->phy_addr = cpu_to_le32(virt_to_bus(buf)); 413 cp->xfer_status = 0; 414 } 415 416 static inline void setup_transfer(struct floppy_state *fs) 417 { 418 int n; 419 struct swim3 __iomem *sw = fs->swim3; 420 struct dbdma_cmd *cp = fs->dma_cmd; 421 struct dbdma_regs __iomem *dr = fs->dma; 422 struct request *req = fs->cur_req; 423 424 if (blk_rq_cur_sectors(req) <= 0) { 425 swim3_warn("%s", "Transfer 0 sectors ?\n"); 426 return; 427 } 428 if (rq_data_dir(req) == WRITE) 429 n = 1; 430 else { 431 n = fs->secpertrack - fs->req_sector + 1; 432 if (n > blk_rq_cur_sectors(req)) 433 n = blk_rq_cur_sectors(req); 434 } 435 436 swim3_dbg(" setup xfer at sect %d (of %d) head %d for %d\n", 437 fs->req_sector, fs->secpertrack, fs->head, n); 438 439 fs->scount = n; 440 swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0); 441 out_8(&sw->sector, fs->req_sector); 442 out_8(&sw->nsect, n); 443 out_8(&sw->gap3, 0); 444 out_le32(&dr->cmdptr, virt_to_bus(cp)); 445 if (rq_data_dir(req) == WRITE) { 446 /* Set up 3 dma commands: write preamble, data, postamble */ 447 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble)); 448 ++cp; 449 init_dma(cp, OUTPUT_MORE, bio_data(req->bio), 512); 450 ++cp; 451 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble)); 452 } else { 453 init_dma(cp, INPUT_LAST, bio_data(req->bio), n * 512); 454 } 455 ++cp; 456 out_le16(&cp->command, DBDMA_STOP); 457 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 458 in_8(&sw->error); 459 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 460 if (rq_data_dir(req) == WRITE) 461 out_8(&sw->control_bis, WRITE_SECTORS); 462 in_8(&sw->intr); 463 out_le32(&dr->control, (RUN << 16) | RUN); 464 /* enable intr when transfer complete */ 465 out_8(&sw->intr_enable, TRANSFER_DONE); 466 out_8(&sw->control_bis, DO_ACTION); 467 set_timeout(fs, 2*HZ, xfer_timeout); /* enable timeout */ 468 } 469 470 static void act(struct floppy_state *fs) 471 { 472 for (;;) { 473 swim3_dbg(" act loop, state=%d, req_cyl=%d, cur_cyl=%d\n", 474 fs->state, fs->req_cyl, fs->cur_cyl); 475 476 switch (fs->state) { 477 case idle: 478 return; /* XXX shouldn't get here */ 479 480 case locating: 481 if (swim3_readbit(fs, TRACK_ZERO)) { 482 swim3_dbg("%s", " locate track 0\n"); 483 fs->cur_cyl = 0; 484 if (fs->req_cyl == 0) 485 fs->state = do_transfer; 486 else 487 fs->state = seeking; 488 break; 489 } 490 scan_track(fs); 491 return; 492 493 case seeking: 494 if (fs->cur_cyl < 0) { 495 fs->expect_cyl = -1; 496 fs->state = locating; 497 break; 498 } 499 if (fs->req_cyl == fs->cur_cyl) { 500 swim3_warn("%s", "Whoops, seeking 0\n"); 501 fs->state = do_transfer; 502 break; 503 } 504 seek_track(fs, fs->req_cyl - fs->cur_cyl); 505 return; 506 507 case settling: 508 /* check for SEEK_COMPLETE after 30ms */ 509 fs->settle_time = (HZ + 32) / 33; 510 set_timeout(fs, fs->settle_time, settle_timeout); 511 return; 512 513 case do_transfer: 514 if (fs->cur_cyl != fs->req_cyl) { 515 if (fs->retries > 5) { 516 swim3_err("Wrong cylinder in transfer, want: %d got %d\n", 517 fs->req_cyl, fs->cur_cyl); 518 swim3_end_request(fs, BLK_STS_IOERR, 0); 519 fs->state = idle; 520 return; 521 } 522 fs->state = seeking; 523 break; 524 } 525 setup_transfer(fs); 526 return; 527 528 case jogging: 529 seek_track(fs, -5); 530 return; 531 532 default: 533 swim3_err("Unknown state %d\n", fs->state); 534 return; 535 } 536 } 537 } 538 539 static void scan_timeout(struct timer_list *t) 540 { 541 struct floppy_state *fs = from_timer(fs, t, timeout); 542 struct swim3 __iomem *sw = fs->swim3; 543 unsigned long flags; 544 545 swim3_dbg("* scan timeout, state=%d\n", fs->state); 546 547 spin_lock_irqsave(&swim3_lock, flags); 548 fs->timeout_pending = 0; 549 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 550 out_8(&sw->select, RELAX); 551 out_8(&sw->intr_enable, 0); 552 fs->cur_cyl = -1; 553 if (fs->retries > 5) { 554 swim3_end_request(fs, BLK_STS_IOERR, 0); 555 fs->state = idle; 556 } else { 557 fs->state = jogging; 558 act(fs); 559 } 560 spin_unlock_irqrestore(&swim3_lock, flags); 561 } 562 563 static void seek_timeout(struct timer_list *t) 564 { 565 struct floppy_state *fs = from_timer(fs, t, timeout); 566 struct swim3 __iomem *sw = fs->swim3; 567 unsigned long flags; 568 569 swim3_dbg("* seek timeout, state=%d\n", fs->state); 570 571 spin_lock_irqsave(&swim3_lock, flags); 572 fs->timeout_pending = 0; 573 out_8(&sw->control_bic, DO_SEEK); 574 out_8(&sw->select, RELAX); 575 out_8(&sw->intr_enable, 0); 576 swim3_err("%s", "Seek timeout\n"); 577 swim3_end_request(fs, BLK_STS_IOERR, 0); 578 fs->state = idle; 579 spin_unlock_irqrestore(&swim3_lock, flags); 580 } 581 582 static void settle_timeout(struct timer_list *t) 583 { 584 struct floppy_state *fs = from_timer(fs, t, timeout); 585 struct swim3 __iomem *sw = fs->swim3; 586 unsigned long flags; 587 588 swim3_dbg("* settle timeout, state=%d\n", fs->state); 589 590 spin_lock_irqsave(&swim3_lock, flags); 591 fs->timeout_pending = 0; 592 if (swim3_readbit(fs, SEEK_COMPLETE)) { 593 out_8(&sw->select, RELAX); 594 fs->state = locating; 595 act(fs); 596 goto unlock; 597 } 598 out_8(&sw->select, RELAX); 599 if (fs->settle_time < 2*HZ) { 600 ++fs->settle_time; 601 set_timeout(fs, 1, settle_timeout); 602 goto unlock; 603 } 604 swim3_err("%s", "Seek settle timeout\n"); 605 swim3_end_request(fs, BLK_STS_IOERR, 0); 606 fs->state = idle; 607 unlock: 608 spin_unlock_irqrestore(&swim3_lock, flags); 609 } 610 611 static void xfer_timeout(struct timer_list *t) 612 { 613 struct floppy_state *fs = from_timer(fs, t, timeout); 614 struct swim3 __iomem *sw = fs->swim3; 615 struct dbdma_regs __iomem *dr = fs->dma; 616 unsigned long flags; 617 int n; 618 619 swim3_dbg("* xfer timeout, state=%d\n", fs->state); 620 621 spin_lock_irqsave(&swim3_lock, flags); 622 fs->timeout_pending = 0; 623 out_le32(&dr->control, RUN << 16); 624 /* We must wait a bit for dbdma to stop */ 625 for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++) 626 udelay(1); 627 out_8(&sw->intr_enable, 0); 628 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); 629 out_8(&sw->select, RELAX); 630 swim3_err("Timeout %sing sector %ld\n", 631 (rq_data_dir(fs->cur_req)==WRITE? "writ": "read"), 632 (long)blk_rq_pos(fs->cur_req)); 633 swim3_end_request(fs, BLK_STS_IOERR, 0); 634 fs->state = idle; 635 spin_unlock_irqrestore(&swim3_lock, flags); 636 } 637 638 static irqreturn_t swim3_interrupt(int irq, void *dev_id) 639 { 640 struct floppy_state *fs = (struct floppy_state *) dev_id; 641 struct swim3 __iomem *sw = fs->swim3; 642 int intr, err, n; 643 int stat, resid; 644 struct dbdma_regs __iomem *dr; 645 struct dbdma_cmd *cp; 646 unsigned long flags; 647 struct request *req = fs->cur_req; 648 649 swim3_dbg("* interrupt, state=%d\n", fs->state); 650 651 spin_lock_irqsave(&swim3_lock, flags); 652 intr = in_8(&sw->intr); 653 err = (intr & ERROR_INTR)? in_8(&sw->error): 0; 654 if ((intr & ERROR_INTR) && fs->state != do_transfer) 655 swim3_err("Non-transfer error interrupt: state=%d, dir=%x, intr=%x, err=%x\n", 656 fs->state, rq_data_dir(req), intr, err); 657 switch (fs->state) { 658 case locating: 659 if (intr & SEEN_SECTOR) { 660 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 661 out_8(&sw->select, RELAX); 662 out_8(&sw->intr_enable, 0); 663 del_timer(&fs->timeout); 664 fs->timeout_pending = 0; 665 if (sw->ctrack == 0xff) { 666 swim3_err("%s", "Seen sector but cyl=ff?\n"); 667 fs->cur_cyl = -1; 668 if (fs->retries > 5) { 669 swim3_end_request(fs, BLK_STS_IOERR, 0); 670 fs->state = idle; 671 } else { 672 fs->state = jogging; 673 act(fs); 674 } 675 break; 676 } 677 fs->cur_cyl = sw->ctrack; 678 fs->cur_sector = sw->csect; 679 if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl) 680 swim3_err("Expected cyl %d, got %d\n", 681 fs->expect_cyl, fs->cur_cyl); 682 fs->state = do_transfer; 683 act(fs); 684 } 685 break; 686 case seeking: 687 case jogging: 688 if (sw->nseek == 0) { 689 out_8(&sw->control_bic, DO_SEEK); 690 out_8(&sw->select, RELAX); 691 out_8(&sw->intr_enable, 0); 692 del_timer(&fs->timeout); 693 fs->timeout_pending = 0; 694 if (fs->state == seeking) 695 ++fs->retries; 696 fs->state = settling; 697 act(fs); 698 } 699 break; 700 case settling: 701 out_8(&sw->intr_enable, 0); 702 del_timer(&fs->timeout); 703 fs->timeout_pending = 0; 704 act(fs); 705 break; 706 case do_transfer: 707 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0) 708 break; 709 out_8(&sw->intr_enable, 0); 710 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); 711 out_8(&sw->select, RELAX); 712 del_timer(&fs->timeout); 713 fs->timeout_pending = 0; 714 dr = fs->dma; 715 cp = fs->dma_cmd; 716 if (rq_data_dir(req) == WRITE) 717 ++cp; 718 /* 719 * Check that the main data transfer has finished. 720 * On writing, the swim3 sometimes doesn't use 721 * up all the bytes of the postamble, so we can still 722 * see DMA active here. That doesn't matter as long 723 * as all the sector data has been transferred. 724 */ 725 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) { 726 /* wait a little while for DMA to complete */ 727 for (n = 0; n < 100; ++n) { 728 if (cp->xfer_status != 0) 729 break; 730 udelay(1); 731 barrier(); 732 } 733 } 734 /* turn off DMA */ 735 out_le32(&dr->control, (RUN | PAUSE) << 16); 736 stat = le16_to_cpu(cp->xfer_status); 737 resid = le16_to_cpu(cp->res_count); 738 if (intr & ERROR_INTR) { 739 n = fs->scount - 1 - resid / 512; 740 if (n > 0) { 741 blk_update_request(req, 0, n << 9); 742 fs->req_sector += n; 743 } 744 if (fs->retries < 5) { 745 ++fs->retries; 746 act(fs); 747 } else { 748 swim3_err("Error %sing block %ld (err=%x)\n", 749 rq_data_dir(req) == WRITE? "writ": "read", 750 (long)blk_rq_pos(req), err); 751 swim3_end_request(fs, BLK_STS_IOERR, 0); 752 fs->state = idle; 753 } 754 } else { 755 if ((stat & ACTIVE) == 0 || resid != 0) { 756 /* musta been an error */ 757 swim3_err("fd dma error: stat=%x resid=%d\n", stat, resid); 758 swim3_err(" state=%d, dir=%x, intr=%x, err=%x\n", 759 fs->state, rq_data_dir(req), intr, err); 760 swim3_end_request(fs, BLK_STS_IOERR, 0); 761 fs->state = idle; 762 break; 763 } 764 fs->retries = 0; 765 if (swim3_end_request(fs, 0, fs->scount << 9)) { 766 fs->req_sector += fs->scount; 767 if (fs->req_sector > fs->secpertrack) { 768 fs->req_sector -= fs->secpertrack; 769 if (++fs->head > 1) { 770 fs->head = 0; 771 ++fs->req_cyl; 772 } 773 } 774 act(fs); 775 } else 776 fs->state = idle; 777 } 778 break; 779 default: 780 swim3_err("Don't know what to do in state %d\n", fs->state); 781 } 782 spin_unlock_irqrestore(&swim3_lock, flags); 783 return IRQ_HANDLED; 784 } 785 786 /* 787 static void fd_dma_interrupt(int irq, void *dev_id) 788 { 789 } 790 */ 791 792 /* Called under the mutex to grab exclusive access to a drive */ 793 static int grab_drive(struct floppy_state *fs, enum swim_state state, 794 int interruptible) 795 { 796 unsigned long flags; 797 798 swim3_dbg("%s", "-> grab drive\n"); 799 800 spin_lock_irqsave(&swim3_lock, flags); 801 if (fs->state != idle && fs->state != available) { 802 ++fs->wanted; 803 /* this will enable irqs in order to sleep */ 804 if (!interruptible) 805 wait_event_lock_irq(fs->wait, 806 fs->state == available, 807 swim3_lock); 808 else if (wait_event_interruptible_lock_irq(fs->wait, 809 fs->state == available, 810 swim3_lock)) { 811 --fs->wanted; 812 spin_unlock_irqrestore(&swim3_lock, flags); 813 return -EINTR; 814 } 815 --fs->wanted; 816 } 817 fs->state = state; 818 spin_unlock_irqrestore(&swim3_lock, flags); 819 820 return 0; 821 } 822 823 static void release_drive(struct floppy_state *fs) 824 { 825 struct request_queue *q = disks[fs->index]->queue; 826 unsigned long flags; 827 828 swim3_dbg("%s", "-> release drive\n"); 829 830 spin_lock_irqsave(&swim3_lock, flags); 831 fs->state = idle; 832 spin_unlock_irqrestore(&swim3_lock, flags); 833 834 blk_mq_freeze_queue(q); 835 blk_mq_quiesce_queue(q); 836 blk_mq_unquiesce_queue(q); 837 blk_mq_unfreeze_queue(q); 838 } 839 840 static int fd_eject(struct floppy_state *fs) 841 { 842 int err, n; 843 844 err = grab_drive(fs, ejecting, 1); 845 if (err) 846 return err; 847 swim3_action(fs, EJECT); 848 for (n = 20; n > 0; --n) { 849 if (signal_pending(current)) { 850 err = -EINTR; 851 break; 852 } 853 swim3_select(fs, RELAX); 854 schedule_timeout_interruptible(1); 855 if (swim3_readbit(fs, DISK_IN) == 0) 856 break; 857 } 858 swim3_select(fs, RELAX); 859 udelay(150); 860 fs->ejected = 1; 861 release_drive(fs); 862 return err; 863 } 864 865 static struct floppy_struct floppy_type = 866 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */ 867 868 static int floppy_locked_ioctl(struct block_device *bdev, fmode_t mode, 869 unsigned int cmd, unsigned long param) 870 { 871 struct floppy_state *fs = bdev->bd_disk->private_data; 872 int err; 873 874 if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)) 875 return -EPERM; 876 877 if (fs->mdev->media_bay && 878 check_media_bay(fs->mdev->media_bay) != MB_FD) 879 return -ENXIO; 880 881 switch (cmd) { 882 case FDEJECT: 883 if (fs->ref_count != 1) 884 return -EBUSY; 885 err = fd_eject(fs); 886 return err; 887 case FDGETPRM: 888 if (copy_to_user((void __user *) param, &floppy_type, 889 sizeof(struct floppy_struct))) 890 return -EFAULT; 891 return 0; 892 } 893 return -ENOTTY; 894 } 895 896 static int floppy_ioctl(struct block_device *bdev, fmode_t mode, 897 unsigned int cmd, unsigned long param) 898 { 899 int ret; 900 901 mutex_lock(&swim3_mutex); 902 ret = floppy_locked_ioctl(bdev, mode, cmd, param); 903 mutex_unlock(&swim3_mutex); 904 905 return ret; 906 } 907 908 static int floppy_open(struct block_device *bdev, fmode_t mode) 909 { 910 struct floppy_state *fs = bdev->bd_disk->private_data; 911 struct swim3 __iomem *sw = fs->swim3; 912 int n, err = 0; 913 914 if (fs->ref_count == 0) { 915 if (fs->mdev->media_bay && 916 check_media_bay(fs->mdev->media_bay) != MB_FD) 917 return -ENXIO; 918 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2); 919 out_8(&sw->control_bic, 0xff); 920 out_8(&sw->mode, 0x95); 921 udelay(10); 922 out_8(&sw->intr_enable, 0); 923 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE); 924 swim3_action(fs, MOTOR_ON); 925 fs->write_prot = -1; 926 fs->cur_cyl = -1; 927 for (n = 0; n < 2 * HZ; ++n) { 928 if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE)) 929 break; 930 if (signal_pending(current)) { 931 err = -EINTR; 932 break; 933 } 934 swim3_select(fs, RELAX); 935 schedule_timeout_interruptible(1); 936 } 937 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0 938 || swim3_readbit(fs, DISK_IN) == 0)) 939 err = -ENXIO; 940 swim3_action(fs, SETMFM); 941 swim3_select(fs, RELAX); 942 943 } else if (fs->ref_count == -1 || mode & FMODE_EXCL) 944 return -EBUSY; 945 946 if (err == 0 && (mode & FMODE_NDELAY) == 0 947 && (mode & (FMODE_READ|FMODE_WRITE))) { 948 if (bdev_check_media_change(bdev)) 949 floppy_revalidate(bdev->bd_disk); 950 if (fs->ejected) 951 err = -ENXIO; 952 } 953 954 if (err == 0 && (mode & FMODE_WRITE)) { 955 if (fs->write_prot < 0) 956 fs->write_prot = swim3_readbit(fs, WRITE_PROT); 957 if (fs->write_prot) 958 err = -EROFS; 959 } 960 961 if (err) { 962 if (fs->ref_count == 0) { 963 swim3_action(fs, MOTOR_OFF); 964 out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE); 965 swim3_select(fs, RELAX); 966 } 967 return err; 968 } 969 970 if (mode & FMODE_EXCL) 971 fs->ref_count = -1; 972 else 973 ++fs->ref_count; 974 975 return 0; 976 } 977 978 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode) 979 { 980 int ret; 981 982 mutex_lock(&swim3_mutex); 983 ret = floppy_open(bdev, mode); 984 mutex_unlock(&swim3_mutex); 985 986 return ret; 987 } 988 989 static void floppy_release(struct gendisk *disk, fmode_t mode) 990 { 991 struct floppy_state *fs = disk->private_data; 992 struct swim3 __iomem *sw = fs->swim3; 993 994 mutex_lock(&swim3_mutex); 995 if (fs->ref_count > 0) 996 --fs->ref_count; 997 else if (fs->ref_count == -1) 998 fs->ref_count = 0; 999 if (fs->ref_count == 0) { 1000 swim3_action(fs, MOTOR_OFF); 1001 out_8(&sw->control_bic, 0xff); 1002 swim3_select(fs, RELAX); 1003 } 1004 mutex_unlock(&swim3_mutex); 1005 } 1006 1007 static unsigned int floppy_check_events(struct gendisk *disk, 1008 unsigned int clearing) 1009 { 1010 struct floppy_state *fs = disk->private_data; 1011 return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0; 1012 } 1013 1014 static int floppy_revalidate(struct gendisk *disk) 1015 { 1016 struct floppy_state *fs = disk->private_data; 1017 struct swim3 __iomem *sw; 1018 int ret, n; 1019 1020 if (fs->mdev->media_bay && 1021 check_media_bay(fs->mdev->media_bay) != MB_FD) 1022 return -ENXIO; 1023 1024 sw = fs->swim3; 1025 grab_drive(fs, revalidating, 0); 1026 out_8(&sw->intr_enable, 0); 1027 out_8(&sw->control_bis, DRIVE_ENABLE); 1028 swim3_action(fs, MOTOR_ON); /* necessary? */ 1029 fs->write_prot = -1; 1030 fs->cur_cyl = -1; 1031 mdelay(1); 1032 for (n = HZ; n > 0; --n) { 1033 if (swim3_readbit(fs, SEEK_COMPLETE)) 1034 break; 1035 if (signal_pending(current)) 1036 break; 1037 swim3_select(fs, RELAX); 1038 schedule_timeout_interruptible(1); 1039 } 1040 ret = swim3_readbit(fs, SEEK_COMPLETE) == 0 1041 || swim3_readbit(fs, DISK_IN) == 0; 1042 if (ret) 1043 swim3_action(fs, MOTOR_OFF); 1044 else { 1045 fs->ejected = 0; 1046 swim3_action(fs, SETMFM); 1047 } 1048 swim3_select(fs, RELAX); 1049 1050 release_drive(fs); 1051 return ret; 1052 } 1053 1054 static const struct block_device_operations floppy_fops = { 1055 .open = floppy_unlocked_open, 1056 .release = floppy_release, 1057 .ioctl = floppy_ioctl, 1058 .check_events = floppy_check_events, 1059 }; 1060 1061 static const struct blk_mq_ops swim3_mq_ops = { 1062 .queue_rq = swim3_queue_rq, 1063 }; 1064 1065 static void swim3_mb_event(struct macio_dev* mdev, int mb_state) 1066 { 1067 struct floppy_state *fs = macio_get_drvdata(mdev); 1068 struct swim3 __iomem *sw; 1069 1070 if (!fs) 1071 return; 1072 1073 sw = fs->swim3; 1074 1075 if (mb_state != MB_FD) 1076 return; 1077 1078 /* Clear state */ 1079 out_8(&sw->intr_enable, 0); 1080 in_8(&sw->intr); 1081 in_8(&sw->error); 1082 } 1083 1084 static int swim3_add_device(struct macio_dev *mdev, int index) 1085 { 1086 struct device_node *swim = mdev->ofdev.dev.of_node; 1087 struct floppy_state *fs = &floppy_states[index]; 1088 int rc = -EBUSY; 1089 1090 fs->mdev = mdev; 1091 fs->index = index; 1092 1093 /* Check & Request resources */ 1094 if (macio_resource_count(mdev) < 2) { 1095 swim3_err("%s", "No address in device-tree\n"); 1096 return -ENXIO; 1097 } 1098 if (macio_irq_count(mdev) < 1) { 1099 swim3_err("%s", "No interrupt in device-tree\n"); 1100 return -ENXIO; 1101 } 1102 if (macio_request_resource(mdev, 0, "swim3 (mmio)")) { 1103 swim3_err("%s", "Can't request mmio resource\n"); 1104 return -EBUSY; 1105 } 1106 if (macio_request_resource(mdev, 1, "swim3 (dma)")) { 1107 swim3_err("%s", "Can't request dma resource\n"); 1108 macio_release_resource(mdev, 0); 1109 return -EBUSY; 1110 } 1111 dev_set_drvdata(&mdev->ofdev.dev, fs); 1112 1113 if (mdev->media_bay == NULL) 1114 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1); 1115 1116 fs->state = idle; 1117 fs->swim3 = (struct swim3 __iomem *) 1118 ioremap(macio_resource_start(mdev, 0), 0x200); 1119 if (fs->swim3 == NULL) { 1120 swim3_err("%s", "Couldn't map mmio registers\n"); 1121 rc = -ENOMEM; 1122 goto out_release; 1123 } 1124 fs->dma = (struct dbdma_regs __iomem *) 1125 ioremap(macio_resource_start(mdev, 1), 0x200); 1126 if (fs->dma == NULL) { 1127 swim3_err("%s", "Couldn't map dma registers\n"); 1128 iounmap(fs->swim3); 1129 rc = -ENOMEM; 1130 goto out_release; 1131 } 1132 fs->swim3_intr = macio_irq(mdev, 0); 1133 fs->dma_intr = macio_irq(mdev, 1); 1134 fs->cur_cyl = -1; 1135 fs->cur_sector = -1; 1136 fs->secpercyl = 36; 1137 fs->secpertrack = 18; 1138 fs->total_secs = 2880; 1139 init_waitqueue_head(&fs->wait); 1140 1141 fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space); 1142 memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd)); 1143 fs->dma_cmd[1].command = cpu_to_le16(DBDMA_STOP); 1144 1145 if (mdev->media_bay == NULL || check_media_bay(mdev->media_bay) == MB_FD) 1146 swim3_mb_event(mdev, MB_FD); 1147 1148 if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) { 1149 swim3_err("%s", "Couldn't request interrupt\n"); 1150 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0); 1151 goto out_unmap; 1152 } 1153 1154 timer_setup(&fs->timeout, NULL, 0); 1155 1156 swim3_info("SWIM3 floppy controller %s\n", 1157 mdev->media_bay ? "in media bay" : ""); 1158 1159 return 0; 1160 1161 out_unmap: 1162 iounmap(fs->dma); 1163 iounmap(fs->swim3); 1164 1165 out_release: 1166 macio_release_resource(mdev, 0); 1167 macio_release_resource(mdev, 1); 1168 1169 return rc; 1170 } 1171 1172 static int swim3_attach(struct macio_dev *mdev, 1173 const struct of_device_id *match) 1174 { 1175 struct floppy_state *fs; 1176 struct gendisk *disk; 1177 int rc; 1178 1179 if (floppy_count >= MAX_FLOPPIES) 1180 return -ENXIO; 1181 1182 if (floppy_count == 0) { 1183 rc = register_blkdev(FLOPPY_MAJOR, "fd"); 1184 if (rc) 1185 return rc; 1186 } 1187 1188 disk = alloc_disk(1); 1189 if (disk == NULL) { 1190 rc = -ENOMEM; 1191 goto out_unregister; 1192 } 1193 1194 fs = &floppy_states[floppy_count]; 1195 memset(fs, 0, sizeof(*fs)); 1196 1197 disk->queue = blk_mq_init_sq_queue(&fs->tag_set, &swim3_mq_ops, 2, 1198 BLK_MQ_F_SHOULD_MERGE); 1199 if (IS_ERR(disk->queue)) { 1200 rc = PTR_ERR(disk->queue); 1201 disk->queue = NULL; 1202 goto out_put_disk; 1203 } 1204 blk_queue_bounce_limit(disk->queue, BLK_BOUNCE_HIGH); 1205 disk->queue->queuedata = fs; 1206 1207 rc = swim3_add_device(mdev, floppy_count); 1208 if (rc) 1209 goto out_cleanup_queue; 1210 1211 disk->major = FLOPPY_MAJOR; 1212 disk->first_minor = floppy_count; 1213 disk->fops = &floppy_fops; 1214 disk->private_data = fs; 1215 disk->events = DISK_EVENT_MEDIA_CHANGE; 1216 disk->flags |= GENHD_FL_REMOVABLE; 1217 sprintf(disk->disk_name, "fd%d", floppy_count); 1218 set_capacity(disk, 2880); 1219 add_disk(disk); 1220 1221 disks[floppy_count++] = disk; 1222 return 0; 1223 1224 out_cleanup_queue: 1225 blk_cleanup_queue(disk->queue); 1226 disk->queue = NULL; 1227 blk_mq_free_tag_set(&fs->tag_set); 1228 out_put_disk: 1229 put_disk(disk); 1230 out_unregister: 1231 if (floppy_count == 0) 1232 unregister_blkdev(FLOPPY_MAJOR, "fd"); 1233 return rc; 1234 } 1235 1236 static const struct of_device_id swim3_match[] = 1237 { 1238 { 1239 .name = "swim3", 1240 }, 1241 { 1242 .compatible = "ohare-swim3" 1243 }, 1244 { 1245 .compatible = "swim3" 1246 }, 1247 { /* end of list */ } 1248 }; 1249 1250 static struct macio_driver swim3_driver = 1251 { 1252 .driver = { 1253 .name = "swim3", 1254 .of_match_table = swim3_match, 1255 }, 1256 .probe = swim3_attach, 1257 #ifdef CONFIG_PMAC_MEDIABAY 1258 .mediabay_event = swim3_mb_event, 1259 #endif 1260 #if 0 1261 .suspend = swim3_suspend, 1262 .resume = swim3_resume, 1263 #endif 1264 }; 1265 1266 1267 int swim3_init(void) 1268 { 1269 macio_register_driver(&swim3_driver); 1270 return 0; 1271 } 1272 1273 module_init(swim3_init) 1274 1275 MODULE_LICENSE("GPL"); 1276 MODULE_AUTHOR("Paul Mackerras"); 1277 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR); 1278