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 <linux/major.h> 31 #include <asm/io.h> 32 #include <asm/dbdma.h> 33 #include <asm/prom.h> 34 #include <linux/uaccess.h> 35 #include <asm/mediabay.h> 36 #include <asm/machdep.h> 37 #include <asm/pmac_feature.h> 38 39 #define MAX_FLOPPIES 2 40 41 static DEFINE_MUTEX(swim3_mutex); 42 static struct gendisk *disks[MAX_FLOPPIES]; 43 44 enum swim_state { 45 idle, 46 locating, 47 seeking, 48 settling, 49 do_transfer, 50 jogging, 51 available, 52 revalidating, 53 ejecting 54 }; 55 56 #define REG(x) unsigned char x; char x ## _pad[15]; 57 58 /* 59 * The names for these registers mostly represent speculation on my part. 60 * It will be interesting to see how close they are to the names Apple uses. 61 */ 62 struct swim3 { 63 REG(data); 64 REG(timer); /* counts down at 1MHz */ 65 REG(error); 66 REG(mode); 67 REG(select); /* controls CA0, CA1, CA2 and LSTRB signals */ 68 REG(setup); 69 REG(control); /* writing bits clears them */ 70 REG(status); /* writing bits sets them in control */ 71 REG(intr); 72 REG(nseek); /* # tracks to seek */ 73 REG(ctrack); /* current track number */ 74 REG(csect); /* current sector number */ 75 REG(gap3); /* size of gap 3 in track format */ 76 REG(sector); /* sector # to read or write */ 77 REG(nsect); /* # sectors to read or write */ 78 REG(intr_enable); 79 }; 80 81 #define control_bic control 82 #define control_bis status 83 84 /* Bits in select register */ 85 #define CA_MASK 7 86 #define LSTRB 8 87 88 /* Bits in control register */ 89 #define DO_SEEK 0x80 90 #define FORMAT 0x40 91 #define SELECT 0x20 92 #define WRITE_SECTORS 0x10 93 #define DO_ACTION 0x08 94 #define DRIVE2_ENABLE 0x04 95 #define DRIVE_ENABLE 0x02 96 #define INTR_ENABLE 0x01 97 98 /* Bits in status register */ 99 #define FIFO_1BYTE 0x80 100 #define FIFO_2BYTE 0x40 101 #define ERROR 0x20 102 #define DATA 0x08 103 #define RDDATA 0x04 104 #define INTR_PENDING 0x02 105 #define MARK_BYTE 0x01 106 107 /* Bits in intr and intr_enable registers */ 108 #define ERROR_INTR 0x20 109 #define DATA_CHANGED 0x10 110 #define TRANSFER_DONE 0x08 111 #define SEEN_SECTOR 0x04 112 #define SEEK_DONE 0x02 113 #define TIMER_DONE 0x01 114 115 /* Bits in error register */ 116 #define ERR_DATA_CRC 0x80 117 #define ERR_ADDR_CRC 0x40 118 #define ERR_OVERRUN 0x04 119 #define ERR_UNDERRUN 0x01 120 121 /* Bits in setup register */ 122 #define S_SW_RESET 0x80 123 #define S_GCR_WRITE 0x40 124 #define S_IBM_DRIVE 0x20 125 #define S_TEST_MODE 0x10 126 #define S_FCLK_DIV2 0x08 127 #define S_GCR 0x04 128 #define S_COPY_PROT 0x02 129 #define S_INV_WDATA 0x01 130 131 /* Select values for swim3_action */ 132 #define SEEK_POSITIVE 0 133 #define SEEK_NEGATIVE 4 134 #define STEP 1 135 #define MOTOR_ON 2 136 #define MOTOR_OFF 6 137 #define INDEX 3 138 #define EJECT 7 139 #define SETMFM 9 140 #define SETGCR 13 141 142 /* Select values for swim3_select and swim3_readbit */ 143 #define STEP_DIR 0 144 #define STEPPING 1 145 #define MOTOR_ON 2 146 #define RELAX 3 /* also eject in progress */ 147 #define READ_DATA_0 4 148 #define ONEMEG_DRIVE 5 149 #define SINGLE_SIDED 6 /* drive or diskette is 4MB type? */ 150 #define DRIVE_PRESENT 7 151 #define DISK_IN 8 152 #define WRITE_PROT 9 153 #define TRACK_ZERO 10 154 #define TACHO 11 155 #define READ_DATA_1 12 156 #define GCR_MODE 13 157 #define SEEK_COMPLETE 14 158 #define TWOMEG_MEDIA 15 159 160 /* Definitions of values used in writing and formatting */ 161 #define DATA_ESCAPE 0x99 162 #define GCR_SYNC_EXC 0x3f 163 #define GCR_SYNC_CONV 0x80 164 #define GCR_FIRST_MARK 0xd5 165 #define GCR_SECOND_MARK 0xaa 166 #define GCR_ADDR_MARK "\xd5\xaa\x00" 167 #define GCR_DATA_MARK "\xd5\xaa\x0b" 168 #define GCR_SLIP_BYTE "\x27\xaa" 169 #define GCR_SELF_SYNC "\x3f\xbf\x1e\x34\x3c\x3f" 170 171 #define DATA_99 "\x99\x99" 172 #define MFM_ADDR_MARK "\x99\xa1\x99\xa1\x99\xa1\x99\xfe" 173 #define MFM_INDEX_MARK "\x99\xc2\x99\xc2\x99\xc2\x99\xfc" 174 #define MFM_GAP_LEN 12 175 176 struct floppy_state { 177 enum swim_state state; 178 struct swim3 __iomem *swim3; /* hardware registers */ 179 struct dbdma_regs __iomem *dma; /* DMA controller registers */ 180 int swim3_intr; /* interrupt number for SWIM3 */ 181 int dma_intr; /* interrupt number for DMA channel */ 182 int cur_cyl; /* cylinder head is on, or -1 */ 183 int cur_sector; /* last sector we saw go past */ 184 int req_cyl; /* the cylinder for the current r/w request */ 185 int head; /* head number ditto */ 186 int req_sector; /* sector number ditto */ 187 int scount; /* # sectors we're transferring at present */ 188 int retries; 189 int settle_time; 190 int secpercyl; /* disk geometry information */ 191 int secpertrack; 192 int total_secs; 193 int write_prot; /* 1 if write-protected, 0 if not, -1 dunno */ 194 struct dbdma_cmd *dma_cmd; 195 int ref_count; 196 int expect_cyl; 197 struct timer_list timeout; 198 int timeout_pending; 199 int ejected; 200 wait_queue_head_t wait; 201 int wanted; 202 struct macio_dev *mdev; 203 char dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)]; 204 int index; 205 struct request *cur_req; 206 struct blk_mq_tag_set tag_set; 207 }; 208 209 #define swim3_err(fmt, arg...) dev_err(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) 210 #define swim3_warn(fmt, arg...) dev_warn(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) 211 #define swim3_info(fmt, arg...) dev_info(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) 212 213 #ifdef DEBUG 214 #define swim3_dbg(fmt, arg...) dev_dbg(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) 215 #else 216 #define swim3_dbg(fmt, arg...) do { } while(0) 217 #endif 218 219 static struct floppy_state floppy_states[MAX_FLOPPIES]; 220 static int floppy_count = 0; 221 static DEFINE_SPINLOCK(swim3_lock); 222 223 static unsigned short write_preamble[] = { 224 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */ 225 0, 0, 0, 0, 0, 0, /* sync field */ 226 0x99a1, 0x99a1, 0x99a1, 0x99fb, /* data address mark */ 227 0x990f /* no escape for 512 bytes */ 228 }; 229 230 static unsigned short write_postamble[] = { 231 0x9904, /* insert CRC */ 232 0x4e4e, 0x4e4e, 233 0x9908, /* stop writing */ 234 0, 0, 0, 0, 0, 0 235 }; 236 237 static void seek_track(struct floppy_state *fs, int n); 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, blk_mode_t mode, 250 unsigned int cmd, unsigned long param); 251 static int floppy_open(struct gendisk *disk, blk_mode_t mode); 252 static unsigned int floppy_check_events(struct gendisk *disk, 253 unsigned int clearing); 254 static int floppy_revalidate(struct gendisk *disk); 255 256 static bool swim3_end_request(struct floppy_state *fs, blk_status_t err, unsigned int nr_bytes) 257 { 258 struct request *req = fs->cur_req; 259 260 swim3_dbg(" end request, err=%d nr_bytes=%d, cur_req=%p\n", 261 err, nr_bytes, req); 262 263 if (err) 264 nr_bytes = blk_rq_cur_bytes(req); 265 if (blk_update_request(req, err, nr_bytes)) 266 return true; 267 __blk_mq_end_request(req, err); 268 fs->cur_req = NULL; 269 return false; 270 } 271 272 static void swim3_select(struct floppy_state *fs, int sel) 273 { 274 struct swim3 __iomem *sw = fs->swim3; 275 276 out_8(&sw->select, RELAX); 277 if (sel & 8) 278 out_8(&sw->control_bis, SELECT); 279 else 280 out_8(&sw->control_bic, SELECT); 281 out_8(&sw->select, sel & CA_MASK); 282 } 283 284 static void swim3_action(struct floppy_state *fs, int action) 285 { 286 struct swim3 __iomem *sw = fs->swim3; 287 288 swim3_select(fs, action); 289 udelay(1); 290 out_8(&sw->select, sw->select | LSTRB); 291 udelay(2); 292 out_8(&sw->select, sw->select & ~LSTRB); 293 udelay(1); 294 } 295 296 static int swim3_readbit(struct floppy_state *fs, int bit) 297 { 298 struct swim3 __iomem *sw = fs->swim3; 299 int stat; 300 301 swim3_select(fs, bit); 302 udelay(1); 303 stat = in_8(&sw->status); 304 return (stat & DATA) == 0; 305 } 306 307 static blk_status_t swim3_queue_rq(struct blk_mq_hw_ctx *hctx, 308 const struct blk_mq_queue_data *bd) 309 { 310 struct floppy_state *fs = hctx->queue->queuedata; 311 struct request *req = bd->rq; 312 unsigned long x; 313 314 spin_lock_irq(&swim3_lock); 315 if (fs->cur_req || fs->state != idle) { 316 spin_unlock_irq(&swim3_lock); 317 return BLK_STS_DEV_RESOURCE; 318 } 319 blk_mq_start_request(req); 320 fs->cur_req = req; 321 if (fs->mdev->media_bay && 322 check_media_bay(fs->mdev->media_bay) != MB_FD) { 323 swim3_dbg("%s", " media bay absent, dropping req\n"); 324 swim3_end_request(fs, BLK_STS_IOERR, 0); 325 goto out; 326 } 327 if (fs->ejected) { 328 swim3_dbg("%s", " disk ejected\n"); 329 swim3_end_request(fs, BLK_STS_IOERR, 0); 330 goto out; 331 } 332 if (rq_data_dir(req) == WRITE) { 333 if (fs->write_prot < 0) 334 fs->write_prot = swim3_readbit(fs, WRITE_PROT); 335 if (fs->write_prot) { 336 swim3_dbg("%s", " try to write, disk write protected\n"); 337 swim3_end_request(fs, BLK_STS_IOERR, 0); 338 goto out; 339 } 340 } 341 342 /* 343 * Do not remove the cast. blk_rq_pos(req) is now a sector_t and can be 344 * 64 bits, but it will never go past 32 bits for this driver anyway, so 345 * we can safely cast it down and not have to do a 64/32 division 346 */ 347 fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl; 348 x = ((long)blk_rq_pos(req)) % fs->secpercyl; 349 fs->head = x / fs->secpertrack; 350 fs->req_sector = x % fs->secpertrack + 1; 351 fs->state = do_transfer; 352 fs->retries = 0; 353 354 act(fs); 355 356 out: 357 spin_unlock_irq(&swim3_lock); 358 return BLK_STS_OK; 359 } 360 361 static void set_timeout(struct floppy_state *fs, int nticks, 362 void (*proc)(struct timer_list *t)) 363 { 364 if (fs->timeout_pending) 365 del_timer(&fs->timeout); 366 fs->timeout.expires = jiffies + nticks; 367 fs->timeout.function = proc; 368 add_timer(&fs->timeout); 369 fs->timeout_pending = 1; 370 } 371 372 static inline void scan_track(struct floppy_state *fs) 373 { 374 struct swim3 __iomem *sw = fs->swim3; 375 376 swim3_select(fs, READ_DATA_0); 377 in_8(&sw->intr); /* clear SEEN_SECTOR bit */ 378 in_8(&sw->error); 379 out_8(&sw->intr_enable, SEEN_SECTOR); 380 out_8(&sw->control_bis, DO_ACTION); 381 /* enable intr when track found */ 382 set_timeout(fs, HZ, scan_timeout); /* enable timeout */ 383 } 384 385 static inline void seek_track(struct floppy_state *fs, int n) 386 { 387 struct swim3 __iomem *sw = fs->swim3; 388 389 if (n >= 0) { 390 swim3_action(fs, SEEK_POSITIVE); 391 sw->nseek = n; 392 } else { 393 swim3_action(fs, SEEK_NEGATIVE); 394 sw->nseek = -n; 395 } 396 fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1; 397 swim3_select(fs, STEP); 398 in_8(&sw->error); 399 /* enable intr when seek finished */ 400 out_8(&sw->intr_enable, SEEK_DONE); 401 out_8(&sw->control_bis, DO_SEEK); 402 set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */ 403 fs->settle_time = 0; 404 } 405 406 /* 407 * XXX: this is a horrible hack, but at least allows ppc32 to get 408 * out of defining virt_to_bus, and this driver out of using the 409 * deprecated block layer bounce buffering for highmem addresses 410 * for no good reason. 411 */ 412 static unsigned long swim3_phys_to_bus(phys_addr_t paddr) 413 { 414 return paddr + PCI_DRAM_OFFSET; 415 } 416 417 static phys_addr_t swim3_bio_phys(struct bio *bio) 418 { 419 return page_to_phys(bio_page(bio)) + bio_offset(bio); 420 } 421 422 static inline void init_dma(struct dbdma_cmd *cp, int cmd, 423 phys_addr_t paddr, int count) 424 { 425 cp->req_count = cpu_to_le16(count); 426 cp->command = cpu_to_le16(cmd); 427 cp->phy_addr = cpu_to_le32(swim3_phys_to_bus(paddr)); 428 cp->xfer_status = 0; 429 } 430 431 static inline void setup_transfer(struct floppy_state *fs) 432 { 433 int n; 434 struct swim3 __iomem *sw = fs->swim3; 435 struct dbdma_cmd *cp = fs->dma_cmd; 436 struct dbdma_regs __iomem *dr = fs->dma; 437 struct request *req = fs->cur_req; 438 439 if (blk_rq_cur_sectors(req) <= 0) { 440 swim3_warn("%s", "Transfer 0 sectors ?\n"); 441 return; 442 } 443 if (rq_data_dir(req) == WRITE) 444 n = 1; 445 else { 446 n = fs->secpertrack - fs->req_sector + 1; 447 if (n > blk_rq_cur_sectors(req)) 448 n = blk_rq_cur_sectors(req); 449 } 450 451 swim3_dbg(" setup xfer at sect %d (of %d) head %d for %d\n", 452 fs->req_sector, fs->secpertrack, fs->head, n); 453 454 fs->scount = n; 455 swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0); 456 out_8(&sw->sector, fs->req_sector); 457 out_8(&sw->nsect, n); 458 out_8(&sw->gap3, 0); 459 out_le32(&dr->cmdptr, swim3_phys_to_bus(virt_to_phys(cp))); 460 if (rq_data_dir(req) == WRITE) { 461 /* Set up 3 dma commands: write preamble, data, postamble */ 462 init_dma(cp, OUTPUT_MORE, virt_to_phys(write_preamble), 463 sizeof(write_preamble)); 464 ++cp; 465 init_dma(cp, OUTPUT_MORE, swim3_bio_phys(req->bio), 512); 466 ++cp; 467 init_dma(cp, OUTPUT_LAST, virt_to_phys(write_postamble), 468 sizeof(write_postamble)); 469 } else { 470 init_dma(cp, INPUT_LAST, swim3_bio_phys(req->bio), n * 512); 471 } 472 ++cp; 473 out_le16(&cp->command, DBDMA_STOP); 474 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 475 in_8(&sw->error); 476 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 477 if (rq_data_dir(req) == WRITE) 478 out_8(&sw->control_bis, WRITE_SECTORS); 479 in_8(&sw->intr); 480 out_le32(&dr->control, (RUN << 16) | RUN); 481 /* enable intr when transfer complete */ 482 out_8(&sw->intr_enable, TRANSFER_DONE); 483 out_8(&sw->control_bis, DO_ACTION); 484 set_timeout(fs, 2*HZ, xfer_timeout); /* enable timeout */ 485 } 486 487 static void act(struct floppy_state *fs) 488 { 489 for (;;) { 490 swim3_dbg(" act loop, state=%d, req_cyl=%d, cur_cyl=%d\n", 491 fs->state, fs->req_cyl, fs->cur_cyl); 492 493 switch (fs->state) { 494 case idle: 495 return; /* XXX shouldn't get here */ 496 497 case locating: 498 if (swim3_readbit(fs, TRACK_ZERO)) { 499 swim3_dbg("%s", " locate track 0\n"); 500 fs->cur_cyl = 0; 501 if (fs->req_cyl == 0) 502 fs->state = do_transfer; 503 else 504 fs->state = seeking; 505 break; 506 } 507 scan_track(fs); 508 return; 509 510 case seeking: 511 if (fs->cur_cyl < 0) { 512 fs->expect_cyl = -1; 513 fs->state = locating; 514 break; 515 } 516 if (fs->req_cyl == fs->cur_cyl) { 517 swim3_warn("%s", "Whoops, seeking 0\n"); 518 fs->state = do_transfer; 519 break; 520 } 521 seek_track(fs, fs->req_cyl - fs->cur_cyl); 522 return; 523 524 case settling: 525 /* check for SEEK_COMPLETE after 30ms */ 526 fs->settle_time = (HZ + 32) / 33; 527 set_timeout(fs, fs->settle_time, settle_timeout); 528 return; 529 530 case do_transfer: 531 if (fs->cur_cyl != fs->req_cyl) { 532 if (fs->retries > 5) { 533 swim3_err("Wrong cylinder in transfer, want: %d got %d\n", 534 fs->req_cyl, fs->cur_cyl); 535 swim3_end_request(fs, BLK_STS_IOERR, 0); 536 fs->state = idle; 537 return; 538 } 539 fs->state = seeking; 540 break; 541 } 542 setup_transfer(fs); 543 return; 544 545 case jogging: 546 seek_track(fs, -5); 547 return; 548 549 default: 550 swim3_err("Unknown state %d\n", fs->state); 551 return; 552 } 553 } 554 } 555 556 static void scan_timeout(struct timer_list *t) 557 { 558 struct floppy_state *fs = from_timer(fs, t, timeout); 559 struct swim3 __iomem *sw = fs->swim3; 560 unsigned long flags; 561 562 swim3_dbg("* scan timeout, state=%d\n", fs->state); 563 564 spin_lock_irqsave(&swim3_lock, flags); 565 fs->timeout_pending = 0; 566 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 567 out_8(&sw->select, RELAX); 568 out_8(&sw->intr_enable, 0); 569 fs->cur_cyl = -1; 570 if (fs->retries > 5) { 571 swim3_end_request(fs, BLK_STS_IOERR, 0); 572 fs->state = idle; 573 } else { 574 fs->state = jogging; 575 act(fs); 576 } 577 spin_unlock_irqrestore(&swim3_lock, flags); 578 } 579 580 static void seek_timeout(struct timer_list *t) 581 { 582 struct floppy_state *fs = from_timer(fs, t, timeout); 583 struct swim3 __iomem *sw = fs->swim3; 584 unsigned long flags; 585 586 swim3_dbg("* seek timeout, state=%d\n", fs->state); 587 588 spin_lock_irqsave(&swim3_lock, flags); 589 fs->timeout_pending = 0; 590 out_8(&sw->control_bic, DO_SEEK); 591 out_8(&sw->select, RELAX); 592 out_8(&sw->intr_enable, 0); 593 swim3_err("%s", "Seek timeout\n"); 594 swim3_end_request(fs, BLK_STS_IOERR, 0); 595 fs->state = idle; 596 spin_unlock_irqrestore(&swim3_lock, flags); 597 } 598 599 static void settle_timeout(struct timer_list *t) 600 { 601 struct floppy_state *fs = from_timer(fs, t, timeout); 602 struct swim3 __iomem *sw = fs->swim3; 603 unsigned long flags; 604 605 swim3_dbg("* settle timeout, state=%d\n", fs->state); 606 607 spin_lock_irqsave(&swim3_lock, flags); 608 fs->timeout_pending = 0; 609 if (swim3_readbit(fs, SEEK_COMPLETE)) { 610 out_8(&sw->select, RELAX); 611 fs->state = locating; 612 act(fs); 613 goto unlock; 614 } 615 out_8(&sw->select, RELAX); 616 if (fs->settle_time < 2*HZ) { 617 ++fs->settle_time; 618 set_timeout(fs, 1, settle_timeout); 619 goto unlock; 620 } 621 swim3_err("%s", "Seek settle timeout\n"); 622 swim3_end_request(fs, BLK_STS_IOERR, 0); 623 fs->state = idle; 624 unlock: 625 spin_unlock_irqrestore(&swim3_lock, flags); 626 } 627 628 static void xfer_timeout(struct timer_list *t) 629 { 630 struct floppy_state *fs = from_timer(fs, t, timeout); 631 struct swim3 __iomem *sw = fs->swim3; 632 struct dbdma_regs __iomem *dr = fs->dma; 633 unsigned long flags; 634 int n; 635 636 swim3_dbg("* xfer timeout, state=%d\n", fs->state); 637 638 spin_lock_irqsave(&swim3_lock, flags); 639 fs->timeout_pending = 0; 640 out_le32(&dr->control, RUN << 16); 641 /* We must wait a bit for dbdma to stop */ 642 for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++) 643 udelay(1); 644 out_8(&sw->intr_enable, 0); 645 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); 646 out_8(&sw->select, RELAX); 647 swim3_err("Timeout %sing sector %ld\n", 648 (rq_data_dir(fs->cur_req)==WRITE? "writ": "read"), 649 (long)blk_rq_pos(fs->cur_req)); 650 swim3_end_request(fs, BLK_STS_IOERR, 0); 651 fs->state = idle; 652 spin_unlock_irqrestore(&swim3_lock, flags); 653 } 654 655 static irqreturn_t swim3_interrupt(int irq, void *dev_id) 656 { 657 struct floppy_state *fs = (struct floppy_state *) dev_id; 658 struct swim3 __iomem *sw = fs->swim3; 659 int intr, err, n; 660 int stat, resid; 661 struct dbdma_regs __iomem *dr; 662 struct dbdma_cmd *cp; 663 unsigned long flags; 664 struct request *req = fs->cur_req; 665 666 swim3_dbg("* interrupt, state=%d\n", fs->state); 667 668 spin_lock_irqsave(&swim3_lock, flags); 669 intr = in_8(&sw->intr); 670 err = (intr & ERROR_INTR)? in_8(&sw->error): 0; 671 if ((intr & ERROR_INTR) && fs->state != do_transfer) 672 swim3_err("Non-transfer error interrupt: state=%d, dir=%x, intr=%x, err=%x\n", 673 fs->state, rq_data_dir(req), intr, err); 674 switch (fs->state) { 675 case locating: 676 if (intr & SEEN_SECTOR) { 677 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 678 out_8(&sw->select, RELAX); 679 out_8(&sw->intr_enable, 0); 680 del_timer(&fs->timeout); 681 fs->timeout_pending = 0; 682 if (sw->ctrack == 0xff) { 683 swim3_err("%s", "Seen sector but cyl=ff?\n"); 684 fs->cur_cyl = -1; 685 if (fs->retries > 5) { 686 swim3_end_request(fs, BLK_STS_IOERR, 0); 687 fs->state = idle; 688 } else { 689 fs->state = jogging; 690 act(fs); 691 } 692 break; 693 } 694 fs->cur_cyl = sw->ctrack; 695 fs->cur_sector = sw->csect; 696 if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl) 697 swim3_err("Expected cyl %d, got %d\n", 698 fs->expect_cyl, fs->cur_cyl); 699 fs->state = do_transfer; 700 act(fs); 701 } 702 break; 703 case seeking: 704 case jogging: 705 if (sw->nseek == 0) { 706 out_8(&sw->control_bic, DO_SEEK); 707 out_8(&sw->select, RELAX); 708 out_8(&sw->intr_enable, 0); 709 del_timer(&fs->timeout); 710 fs->timeout_pending = 0; 711 if (fs->state == seeking) 712 ++fs->retries; 713 fs->state = settling; 714 act(fs); 715 } 716 break; 717 case settling: 718 out_8(&sw->intr_enable, 0); 719 del_timer(&fs->timeout); 720 fs->timeout_pending = 0; 721 act(fs); 722 break; 723 case do_transfer: 724 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0) 725 break; 726 out_8(&sw->intr_enable, 0); 727 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); 728 out_8(&sw->select, RELAX); 729 del_timer(&fs->timeout); 730 fs->timeout_pending = 0; 731 dr = fs->dma; 732 cp = fs->dma_cmd; 733 if (rq_data_dir(req) == WRITE) 734 ++cp; 735 /* 736 * Check that the main data transfer has finished. 737 * On writing, the swim3 sometimes doesn't use 738 * up all the bytes of the postamble, so we can still 739 * see DMA active here. That doesn't matter as long 740 * as all the sector data has been transferred. 741 */ 742 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) { 743 /* wait a little while for DMA to complete */ 744 for (n = 0; n < 100; ++n) { 745 if (cp->xfer_status != 0) 746 break; 747 udelay(1); 748 barrier(); 749 } 750 } 751 /* turn off DMA */ 752 out_le32(&dr->control, (RUN | PAUSE) << 16); 753 stat = le16_to_cpu(cp->xfer_status); 754 resid = le16_to_cpu(cp->res_count); 755 if (intr & ERROR_INTR) { 756 n = fs->scount - 1 - resid / 512; 757 if (n > 0) { 758 blk_update_request(req, 0, n << 9); 759 fs->req_sector += n; 760 } 761 if (fs->retries < 5) { 762 ++fs->retries; 763 act(fs); 764 } else { 765 swim3_err("Error %sing block %ld (err=%x)\n", 766 rq_data_dir(req) == WRITE? "writ": "read", 767 (long)blk_rq_pos(req), err); 768 swim3_end_request(fs, BLK_STS_IOERR, 0); 769 fs->state = idle; 770 } 771 } else { 772 if ((stat & ACTIVE) == 0 || resid != 0) { 773 /* musta been an error */ 774 swim3_err("fd dma error: stat=%x resid=%d\n", stat, resid); 775 swim3_err(" state=%d, dir=%x, intr=%x, err=%x\n", 776 fs->state, rq_data_dir(req), intr, err); 777 swim3_end_request(fs, BLK_STS_IOERR, 0); 778 fs->state = idle; 779 break; 780 } 781 fs->retries = 0; 782 if (swim3_end_request(fs, 0, fs->scount << 9)) { 783 fs->req_sector += fs->scount; 784 if (fs->req_sector > fs->secpertrack) { 785 fs->req_sector -= fs->secpertrack; 786 if (++fs->head > 1) { 787 fs->head = 0; 788 ++fs->req_cyl; 789 } 790 } 791 act(fs); 792 } else 793 fs->state = idle; 794 } 795 break; 796 default: 797 swim3_err("Don't know what to do in state %d\n", fs->state); 798 } 799 spin_unlock_irqrestore(&swim3_lock, flags); 800 return IRQ_HANDLED; 801 } 802 803 /* 804 static void fd_dma_interrupt(int irq, void *dev_id) 805 { 806 } 807 */ 808 809 /* Called under the mutex to grab exclusive access to a drive */ 810 static int grab_drive(struct floppy_state *fs, enum swim_state state, 811 int interruptible) 812 { 813 unsigned long flags; 814 815 swim3_dbg("%s", "-> grab drive\n"); 816 817 spin_lock_irqsave(&swim3_lock, flags); 818 if (fs->state != idle && fs->state != available) { 819 ++fs->wanted; 820 /* this will enable irqs in order to sleep */ 821 if (!interruptible) 822 wait_event_lock_irq(fs->wait, 823 fs->state == available, 824 swim3_lock); 825 else if (wait_event_interruptible_lock_irq(fs->wait, 826 fs->state == available, 827 swim3_lock)) { 828 --fs->wanted; 829 spin_unlock_irqrestore(&swim3_lock, flags); 830 return -EINTR; 831 } 832 --fs->wanted; 833 } 834 fs->state = state; 835 spin_unlock_irqrestore(&swim3_lock, flags); 836 837 return 0; 838 } 839 840 static void release_drive(struct floppy_state *fs) 841 { 842 struct request_queue *q = disks[fs->index]->queue; 843 unsigned long flags; 844 845 swim3_dbg("%s", "-> release drive\n"); 846 847 spin_lock_irqsave(&swim3_lock, flags); 848 fs->state = idle; 849 spin_unlock_irqrestore(&swim3_lock, flags); 850 851 blk_mq_freeze_queue(q); 852 blk_mq_quiesce_queue(q); 853 blk_mq_unquiesce_queue(q); 854 blk_mq_unfreeze_queue(q); 855 } 856 857 static int fd_eject(struct floppy_state *fs) 858 { 859 int err, n; 860 861 err = grab_drive(fs, ejecting, 1); 862 if (err) 863 return err; 864 swim3_action(fs, EJECT); 865 for (n = 20; n > 0; --n) { 866 if (signal_pending(current)) { 867 err = -EINTR; 868 break; 869 } 870 swim3_select(fs, RELAX); 871 schedule_timeout_interruptible(1); 872 if (swim3_readbit(fs, DISK_IN) == 0) 873 break; 874 } 875 swim3_select(fs, RELAX); 876 udelay(150); 877 fs->ejected = 1; 878 release_drive(fs); 879 return err; 880 } 881 882 static struct floppy_struct floppy_type = 883 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */ 884 885 static int floppy_locked_ioctl(struct block_device *bdev, blk_mode_t mode, 886 unsigned int cmd, unsigned long param) 887 { 888 struct floppy_state *fs = bdev->bd_disk->private_data; 889 int err; 890 891 if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)) 892 return -EPERM; 893 894 if (fs->mdev->media_bay && 895 check_media_bay(fs->mdev->media_bay) != MB_FD) 896 return -ENXIO; 897 898 switch (cmd) { 899 case FDEJECT: 900 if (fs->ref_count != 1) 901 return -EBUSY; 902 err = fd_eject(fs); 903 return err; 904 case FDGETPRM: 905 if (copy_to_user((void __user *) param, &floppy_type, 906 sizeof(struct floppy_struct))) 907 return -EFAULT; 908 return 0; 909 } 910 return -ENOTTY; 911 } 912 913 static int floppy_ioctl(struct block_device *bdev, blk_mode_t mode, 914 unsigned int cmd, unsigned long param) 915 { 916 int ret; 917 918 mutex_lock(&swim3_mutex); 919 ret = floppy_locked_ioctl(bdev, mode, cmd, param); 920 mutex_unlock(&swim3_mutex); 921 922 return ret; 923 } 924 925 static int floppy_open(struct gendisk *disk, blk_mode_t mode) 926 { 927 struct floppy_state *fs = disk->private_data; 928 struct swim3 __iomem *sw = fs->swim3; 929 int n, err = 0; 930 931 if (fs->ref_count == 0) { 932 if (fs->mdev->media_bay && 933 check_media_bay(fs->mdev->media_bay) != MB_FD) 934 return -ENXIO; 935 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2); 936 out_8(&sw->control_bic, 0xff); 937 out_8(&sw->mode, 0x95); 938 udelay(10); 939 out_8(&sw->intr_enable, 0); 940 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE); 941 swim3_action(fs, MOTOR_ON); 942 fs->write_prot = -1; 943 fs->cur_cyl = -1; 944 for (n = 0; n < 2 * HZ; ++n) { 945 if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE)) 946 break; 947 if (signal_pending(current)) { 948 err = -EINTR; 949 break; 950 } 951 swim3_select(fs, RELAX); 952 schedule_timeout_interruptible(1); 953 } 954 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0 955 || swim3_readbit(fs, DISK_IN) == 0)) 956 err = -ENXIO; 957 swim3_action(fs, SETMFM); 958 swim3_select(fs, RELAX); 959 960 } else if (fs->ref_count == -1 || mode & BLK_OPEN_EXCL) 961 return -EBUSY; 962 963 if (err == 0 && !(mode & BLK_OPEN_NDELAY) && 964 (mode & (BLK_OPEN_READ | BLK_OPEN_WRITE))) { 965 if (disk_check_media_change(disk)) 966 floppy_revalidate(disk); 967 if (fs->ejected) 968 err = -ENXIO; 969 } 970 971 if (err == 0 && (mode & BLK_OPEN_WRITE)) { 972 if (fs->write_prot < 0) 973 fs->write_prot = swim3_readbit(fs, WRITE_PROT); 974 if (fs->write_prot) 975 err = -EROFS; 976 } 977 978 if (err) { 979 if (fs->ref_count == 0) { 980 swim3_action(fs, MOTOR_OFF); 981 out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE); 982 swim3_select(fs, RELAX); 983 } 984 return err; 985 } 986 987 if (mode & BLK_OPEN_EXCL) 988 fs->ref_count = -1; 989 else 990 ++fs->ref_count; 991 992 return 0; 993 } 994 995 static int floppy_unlocked_open(struct gendisk *disk, blk_mode_t mode) 996 { 997 int ret; 998 999 mutex_lock(&swim3_mutex); 1000 ret = floppy_open(disk, mode); 1001 mutex_unlock(&swim3_mutex); 1002 1003 return ret; 1004 } 1005 1006 static void floppy_release(struct gendisk *disk) 1007 { 1008 struct floppy_state *fs = disk->private_data; 1009 struct swim3 __iomem *sw = fs->swim3; 1010 1011 mutex_lock(&swim3_mutex); 1012 if (fs->ref_count > 0) 1013 --fs->ref_count; 1014 else if (fs->ref_count == -1) 1015 fs->ref_count = 0; 1016 if (fs->ref_count == 0) { 1017 swim3_action(fs, MOTOR_OFF); 1018 out_8(&sw->control_bic, 0xff); 1019 swim3_select(fs, RELAX); 1020 } 1021 mutex_unlock(&swim3_mutex); 1022 } 1023 1024 static unsigned int floppy_check_events(struct gendisk *disk, 1025 unsigned int clearing) 1026 { 1027 struct floppy_state *fs = disk->private_data; 1028 return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0; 1029 } 1030 1031 static int floppy_revalidate(struct gendisk *disk) 1032 { 1033 struct floppy_state *fs = disk->private_data; 1034 struct swim3 __iomem *sw; 1035 int ret, n; 1036 1037 if (fs->mdev->media_bay && 1038 check_media_bay(fs->mdev->media_bay) != MB_FD) 1039 return -ENXIO; 1040 1041 sw = fs->swim3; 1042 grab_drive(fs, revalidating, 0); 1043 out_8(&sw->intr_enable, 0); 1044 out_8(&sw->control_bis, DRIVE_ENABLE); 1045 swim3_action(fs, MOTOR_ON); /* necessary? */ 1046 fs->write_prot = -1; 1047 fs->cur_cyl = -1; 1048 mdelay(1); 1049 for (n = HZ; n > 0; --n) { 1050 if (swim3_readbit(fs, SEEK_COMPLETE)) 1051 break; 1052 if (signal_pending(current)) 1053 break; 1054 swim3_select(fs, RELAX); 1055 schedule_timeout_interruptible(1); 1056 } 1057 ret = swim3_readbit(fs, SEEK_COMPLETE) == 0 1058 || swim3_readbit(fs, DISK_IN) == 0; 1059 if (ret) 1060 swim3_action(fs, MOTOR_OFF); 1061 else { 1062 fs->ejected = 0; 1063 swim3_action(fs, SETMFM); 1064 } 1065 swim3_select(fs, RELAX); 1066 1067 release_drive(fs); 1068 return ret; 1069 } 1070 1071 static const struct block_device_operations floppy_fops = { 1072 .open = floppy_unlocked_open, 1073 .release = floppy_release, 1074 .ioctl = floppy_ioctl, 1075 .check_events = floppy_check_events, 1076 }; 1077 1078 static const struct blk_mq_ops swim3_mq_ops = { 1079 .queue_rq = swim3_queue_rq, 1080 }; 1081 1082 static void swim3_mb_event(struct macio_dev* mdev, int mb_state) 1083 { 1084 struct floppy_state *fs = macio_get_drvdata(mdev); 1085 struct swim3 __iomem *sw; 1086 1087 if (!fs) 1088 return; 1089 1090 sw = fs->swim3; 1091 1092 if (mb_state != MB_FD) 1093 return; 1094 1095 /* Clear state */ 1096 out_8(&sw->intr_enable, 0); 1097 in_8(&sw->intr); 1098 in_8(&sw->error); 1099 } 1100 1101 static int swim3_add_device(struct macio_dev *mdev, int index) 1102 { 1103 struct device_node *swim = mdev->ofdev.dev.of_node; 1104 struct floppy_state *fs = &floppy_states[index]; 1105 int rc = -EBUSY; 1106 1107 fs->mdev = mdev; 1108 fs->index = index; 1109 1110 /* Check & Request resources */ 1111 if (macio_resource_count(mdev) < 2) { 1112 swim3_err("%s", "No address in device-tree\n"); 1113 return -ENXIO; 1114 } 1115 if (macio_irq_count(mdev) < 1) { 1116 swim3_err("%s", "No interrupt in device-tree\n"); 1117 return -ENXIO; 1118 } 1119 if (macio_request_resource(mdev, 0, "swim3 (mmio)")) { 1120 swim3_err("%s", "Can't request mmio resource\n"); 1121 return -EBUSY; 1122 } 1123 if (macio_request_resource(mdev, 1, "swim3 (dma)")) { 1124 swim3_err("%s", "Can't request dma resource\n"); 1125 macio_release_resource(mdev, 0); 1126 return -EBUSY; 1127 } 1128 dev_set_drvdata(&mdev->ofdev.dev, fs); 1129 1130 if (mdev->media_bay == NULL) 1131 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1); 1132 1133 fs->state = idle; 1134 fs->swim3 = (struct swim3 __iomem *) 1135 ioremap(macio_resource_start(mdev, 0), 0x200); 1136 if (fs->swim3 == NULL) { 1137 swim3_err("%s", "Couldn't map mmio registers\n"); 1138 rc = -ENOMEM; 1139 goto out_release; 1140 } 1141 fs->dma = (struct dbdma_regs __iomem *) 1142 ioremap(macio_resource_start(mdev, 1), 0x200); 1143 if (fs->dma == NULL) { 1144 swim3_err("%s", "Couldn't map dma registers\n"); 1145 iounmap(fs->swim3); 1146 rc = -ENOMEM; 1147 goto out_release; 1148 } 1149 fs->swim3_intr = macio_irq(mdev, 0); 1150 fs->dma_intr = macio_irq(mdev, 1); 1151 fs->cur_cyl = -1; 1152 fs->cur_sector = -1; 1153 fs->secpercyl = 36; 1154 fs->secpertrack = 18; 1155 fs->total_secs = 2880; 1156 init_waitqueue_head(&fs->wait); 1157 1158 fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space); 1159 memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd)); 1160 fs->dma_cmd[1].command = cpu_to_le16(DBDMA_STOP); 1161 1162 if (mdev->media_bay == NULL || check_media_bay(mdev->media_bay) == MB_FD) 1163 swim3_mb_event(mdev, MB_FD); 1164 1165 if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) { 1166 swim3_err("%s", "Couldn't request interrupt\n"); 1167 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0); 1168 goto out_unmap; 1169 } 1170 1171 timer_setup(&fs->timeout, NULL, 0); 1172 1173 swim3_info("SWIM3 floppy controller %s\n", 1174 mdev->media_bay ? "in media bay" : ""); 1175 1176 return 0; 1177 1178 out_unmap: 1179 iounmap(fs->dma); 1180 iounmap(fs->swim3); 1181 1182 out_release: 1183 macio_release_resource(mdev, 0); 1184 macio_release_resource(mdev, 1); 1185 1186 return rc; 1187 } 1188 1189 static int swim3_attach(struct macio_dev *mdev, 1190 const struct of_device_id *match) 1191 { 1192 struct floppy_state *fs; 1193 struct gendisk *disk; 1194 int rc; 1195 1196 if (floppy_count >= MAX_FLOPPIES) 1197 return -ENXIO; 1198 1199 if (floppy_count == 0) { 1200 rc = register_blkdev(FLOPPY_MAJOR, "fd"); 1201 if (rc) 1202 return rc; 1203 } 1204 1205 fs = &floppy_states[floppy_count]; 1206 memset(fs, 0, sizeof(*fs)); 1207 1208 rc = blk_mq_alloc_sq_tag_set(&fs->tag_set, &swim3_mq_ops, 2, 1209 BLK_MQ_F_SHOULD_MERGE); 1210 if (rc) 1211 goto out_unregister; 1212 1213 disk = blk_mq_alloc_disk(&fs->tag_set, fs); 1214 if (IS_ERR(disk)) { 1215 rc = PTR_ERR(disk); 1216 goto out_free_tag_set; 1217 } 1218 1219 rc = swim3_add_device(mdev, floppy_count); 1220 if (rc) 1221 goto out_cleanup_disk; 1222 1223 disk->major = FLOPPY_MAJOR; 1224 disk->first_minor = floppy_count; 1225 disk->minors = 1; 1226 disk->fops = &floppy_fops; 1227 disk->private_data = fs; 1228 disk->events = DISK_EVENT_MEDIA_CHANGE; 1229 disk->flags |= GENHD_FL_REMOVABLE | GENHD_FL_NO_PART; 1230 sprintf(disk->disk_name, "fd%d", floppy_count); 1231 set_capacity(disk, 2880); 1232 rc = add_disk(disk); 1233 if (rc) 1234 goto out_cleanup_disk; 1235 1236 disks[floppy_count++] = disk; 1237 return 0; 1238 1239 out_cleanup_disk: 1240 put_disk(disk); 1241 out_free_tag_set: 1242 blk_mq_free_tag_set(&fs->tag_set); 1243 out_unregister: 1244 if (floppy_count == 0) 1245 unregister_blkdev(FLOPPY_MAJOR, "fd"); 1246 return rc; 1247 } 1248 1249 static const struct of_device_id swim3_match[] = 1250 { 1251 { 1252 .name = "swim3", 1253 }, 1254 { 1255 .compatible = "ohare-swim3" 1256 }, 1257 { 1258 .compatible = "swim3" 1259 }, 1260 { /* end of list */ } 1261 }; 1262 1263 static struct macio_driver swim3_driver = 1264 { 1265 .driver = { 1266 .name = "swim3", 1267 .of_match_table = swim3_match, 1268 }, 1269 .probe = swim3_attach, 1270 #ifdef CONFIG_PMAC_MEDIABAY 1271 .mediabay_event = swim3_mb_event, 1272 #endif 1273 #if 0 1274 .suspend = swim3_suspend, 1275 .resume = swim3_resume, 1276 #endif 1277 }; 1278 1279 1280 int swim3_init(void) 1281 { 1282 macio_register_driver(&swim3_driver); 1283 return 0; 1284 } 1285 1286 module_init(swim3_init) 1287 1288 MODULE_LICENSE("GPL"); 1289 MODULE_AUTHOR("Paul Mackerras"); 1290 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR); 1291