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 #include <linux/stddef.h> 20 #include <linux/kernel.h> 21 #include <linux/sched.h> 22 #include <linux/timer.h> 23 #include <linux/delay.h> 24 #include <linux/fd.h> 25 #include <linux/ioctl.h> 26 #include <linux/blkdev.h> 27 #include <linux/interrupt.h> 28 #include <linux/module.h> 29 #include <linux/spinlock.h> 30 #include <asm/io.h> 31 #include <asm/dbdma.h> 32 #include <asm/prom.h> 33 #include <asm/uaccess.h> 34 #include <asm/mediabay.h> 35 #include <asm/machdep.h> 36 #include <asm/pmac_feature.h> 37 38 static struct request_queue *swim3_queue; 39 static struct gendisk *disks[2]; 40 static struct request *fd_req; 41 42 #define MAX_FLOPPIES 2 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 TWOMEG_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 MFM_MODE 13 157 #define SEEK_COMPLETE 14 158 #define ONEMEG_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 spinlock_t lock; 179 struct swim3 __iomem *swim3; /* hardware registers */ 180 struct dbdma_regs __iomem *dma; /* DMA controller registers */ 181 int swim3_intr; /* interrupt number for SWIM3 */ 182 int dma_intr; /* interrupt number for DMA channel */ 183 int cur_cyl; /* cylinder head is on, or -1 */ 184 int cur_sector; /* last sector we saw go past */ 185 int req_cyl; /* the cylinder for the current r/w request */ 186 int head; /* head number ditto */ 187 int req_sector; /* sector number ditto */ 188 int scount; /* # sectors we're transferring at present */ 189 int retries; 190 int settle_time; 191 int secpercyl; /* disk geometry information */ 192 int secpertrack; 193 int total_secs; 194 int write_prot; /* 1 if write-protected, 0 if not, -1 dunno */ 195 struct dbdma_cmd *dma_cmd; 196 int ref_count; 197 int expect_cyl; 198 struct timer_list timeout; 199 int timeout_pending; 200 int ejected; 201 wait_queue_head_t wait; 202 int wanted; 203 struct device_node* media_bay; /* NULL when not in bay */ 204 char dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)]; 205 }; 206 207 static struct floppy_state floppy_states[MAX_FLOPPIES]; 208 static int floppy_count = 0; 209 static DEFINE_SPINLOCK(swim3_lock); 210 211 static unsigned short write_preamble[] = { 212 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */ 213 0, 0, 0, 0, 0, 0, /* sync field */ 214 0x99a1, 0x99a1, 0x99a1, 0x99fb, /* data address mark */ 215 0x990f /* no escape for 512 bytes */ 216 }; 217 218 static unsigned short write_postamble[] = { 219 0x9904, /* insert CRC */ 220 0x4e4e, 0x4e4e, 221 0x9908, /* stop writing */ 222 0, 0, 0, 0, 0, 0 223 }; 224 225 static void swim3_select(struct floppy_state *fs, int sel); 226 static void swim3_action(struct floppy_state *fs, int action); 227 static int swim3_readbit(struct floppy_state *fs, int bit); 228 static void do_fd_request(struct request_queue * q); 229 static void start_request(struct floppy_state *fs); 230 static void set_timeout(struct floppy_state *fs, int nticks, 231 void (*proc)(unsigned long)); 232 static void scan_track(struct floppy_state *fs); 233 static void seek_track(struct floppy_state *fs, int n); 234 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count); 235 static void setup_transfer(struct floppy_state *fs); 236 static void act(struct floppy_state *fs); 237 static void scan_timeout(unsigned long data); 238 static void seek_timeout(unsigned long data); 239 static void settle_timeout(unsigned long data); 240 static void xfer_timeout(unsigned long data); 241 static irqreturn_t swim3_interrupt(int irq, void *dev_id); 242 /*static void fd_dma_interrupt(int irq, void *dev_id);*/ 243 static int grab_drive(struct floppy_state *fs, enum swim_state state, 244 int interruptible); 245 static void release_drive(struct floppy_state *fs); 246 static int fd_eject(struct floppy_state *fs); 247 static int floppy_ioctl(struct block_device *bdev, fmode_t mode, 248 unsigned int cmd, unsigned long param); 249 static int floppy_open(struct block_device *bdev, fmode_t mode); 250 static int floppy_release(struct gendisk *disk, fmode_t mode); 251 static int floppy_check_change(struct gendisk *disk); 252 static int floppy_revalidate(struct gendisk *disk); 253 254 static void swim3_select(struct floppy_state *fs, int sel) 255 { 256 struct swim3 __iomem *sw = fs->swim3; 257 258 out_8(&sw->select, RELAX); 259 if (sel & 8) 260 out_8(&sw->control_bis, SELECT); 261 else 262 out_8(&sw->control_bic, SELECT); 263 out_8(&sw->select, sel & CA_MASK); 264 } 265 266 static void swim3_action(struct floppy_state *fs, int action) 267 { 268 struct swim3 __iomem *sw = fs->swim3; 269 270 swim3_select(fs, action); 271 udelay(1); 272 out_8(&sw->select, sw->select | LSTRB); 273 udelay(2); 274 out_8(&sw->select, sw->select & ~LSTRB); 275 udelay(1); 276 } 277 278 static int swim3_readbit(struct floppy_state *fs, int bit) 279 { 280 struct swim3 __iomem *sw = fs->swim3; 281 int stat; 282 283 swim3_select(fs, bit); 284 udelay(1); 285 stat = in_8(&sw->status); 286 return (stat & DATA) == 0; 287 } 288 289 static void do_fd_request(struct request_queue * q) 290 { 291 int i; 292 for(i=0;i<floppy_count;i++) 293 { 294 #ifdef CONFIG_PMAC_MEDIABAY 295 if (floppy_states[i].media_bay && 296 check_media_bay(floppy_states[i].media_bay, MB_FD)) 297 continue; 298 #endif /* CONFIG_PMAC_MEDIABAY */ 299 start_request(&floppy_states[i]); 300 } 301 } 302 303 static void start_request(struct floppy_state *fs) 304 { 305 struct request *req; 306 unsigned long x; 307 308 if (fs->state == idle && fs->wanted) { 309 fs->state = available; 310 wake_up(&fs->wait); 311 return; 312 } 313 while (fs->state == idle && (req = elv_next_request(swim3_queue))) { 314 #if 0 315 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%ld buf=%p\n", 316 req->rq_disk->disk_name, req->cmd, 317 (long)req->sector, req->nr_sectors, req->buffer); 318 printk(" errors=%d current_nr_sectors=%ld\n", 319 req->errors, req->current_nr_sectors); 320 #endif 321 322 if (req->sector < 0 || req->sector >= fs->total_secs) { 323 end_request(req, 0); 324 continue; 325 } 326 if (req->current_nr_sectors == 0) { 327 end_request(req, 1); 328 continue; 329 } 330 if (fs->ejected) { 331 end_request(req, 0); 332 continue; 333 } 334 335 if (rq_data_dir(req) == WRITE) { 336 if (fs->write_prot < 0) 337 fs->write_prot = swim3_readbit(fs, WRITE_PROT); 338 if (fs->write_prot) { 339 end_request(req, 0); 340 continue; 341 } 342 } 343 344 /* Do not remove the cast. req->sector is now a sector_t and 345 * can be 64 bits, but it will never go past 32 bits for this 346 * driver anyway, so we can safely cast it down and not have 347 * to do a 64/32 division 348 */ 349 fs->req_cyl = ((long)req->sector) / fs->secpercyl; 350 x = ((long)req->sector) % fs->secpercyl; 351 fs->head = x / fs->secpertrack; 352 fs->req_sector = x % fs->secpertrack + 1; 353 fd_req = req; 354 fs->state = do_transfer; 355 fs->retries = 0; 356 357 act(fs); 358 } 359 } 360 361 static void set_timeout(struct floppy_state *fs, int nticks, 362 void (*proc)(unsigned long)) 363 { 364 unsigned long flags; 365 366 spin_lock_irqsave(&fs->lock, flags); 367 if (fs->timeout_pending) 368 del_timer(&fs->timeout); 369 fs->timeout.expires = jiffies + nticks; 370 fs->timeout.function = proc; 371 fs->timeout.data = (unsigned long) fs; 372 add_timer(&fs->timeout); 373 fs->timeout_pending = 1; 374 spin_unlock_irqrestore(&fs->lock, flags); 375 } 376 377 static inline void scan_track(struct floppy_state *fs) 378 { 379 struct swim3 __iomem *sw = fs->swim3; 380 381 swim3_select(fs, READ_DATA_0); 382 in_8(&sw->intr); /* clear SEEN_SECTOR bit */ 383 in_8(&sw->error); 384 out_8(&sw->intr_enable, SEEN_SECTOR); 385 out_8(&sw->control_bis, DO_ACTION); 386 /* enable intr when track found */ 387 set_timeout(fs, HZ, scan_timeout); /* enable timeout */ 388 } 389 390 static inline void seek_track(struct floppy_state *fs, int n) 391 { 392 struct swim3 __iomem *sw = fs->swim3; 393 394 if (n >= 0) { 395 swim3_action(fs, SEEK_POSITIVE); 396 sw->nseek = n; 397 } else { 398 swim3_action(fs, SEEK_NEGATIVE); 399 sw->nseek = -n; 400 } 401 fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1; 402 swim3_select(fs, STEP); 403 in_8(&sw->error); 404 /* enable intr when seek finished */ 405 out_8(&sw->intr_enable, SEEK_DONE); 406 out_8(&sw->control_bis, DO_SEEK); 407 set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */ 408 fs->settle_time = 0; 409 } 410 411 static inline void init_dma(struct dbdma_cmd *cp, int cmd, 412 void *buf, int count) 413 { 414 st_le16(&cp->req_count, count); 415 st_le16(&cp->command, cmd); 416 st_le32(&cp->phy_addr, virt_to_bus(buf)); 417 cp->xfer_status = 0; 418 } 419 420 static inline void setup_transfer(struct floppy_state *fs) 421 { 422 int n; 423 struct swim3 __iomem *sw = fs->swim3; 424 struct dbdma_cmd *cp = fs->dma_cmd; 425 struct dbdma_regs __iomem *dr = fs->dma; 426 427 if (fd_req->current_nr_sectors <= 0) { 428 printk(KERN_ERR "swim3: transfer 0 sectors?\n"); 429 return; 430 } 431 if (rq_data_dir(fd_req) == WRITE) 432 n = 1; 433 else { 434 n = fs->secpertrack - fs->req_sector + 1; 435 if (n > fd_req->current_nr_sectors) 436 n = fd_req->current_nr_sectors; 437 } 438 fs->scount = n; 439 swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0); 440 out_8(&sw->sector, fs->req_sector); 441 out_8(&sw->nsect, n); 442 out_8(&sw->gap3, 0); 443 out_le32(&dr->cmdptr, virt_to_bus(cp)); 444 if (rq_data_dir(fd_req) == WRITE) { 445 /* Set up 3 dma commands: write preamble, data, postamble */ 446 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble)); 447 ++cp; 448 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512); 449 ++cp; 450 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble)); 451 } else { 452 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512); 453 } 454 ++cp; 455 out_le16(&cp->command, DBDMA_STOP); 456 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 457 in_8(&sw->error); 458 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 459 if (rq_data_dir(fd_req) == WRITE) 460 out_8(&sw->control_bis, WRITE_SECTORS); 461 in_8(&sw->intr); 462 out_le32(&dr->control, (RUN << 16) | RUN); 463 /* enable intr when transfer complete */ 464 out_8(&sw->intr_enable, TRANSFER_DONE); 465 out_8(&sw->control_bis, DO_ACTION); 466 set_timeout(fs, 2*HZ, xfer_timeout); /* enable timeout */ 467 } 468 469 static void act(struct floppy_state *fs) 470 { 471 for (;;) { 472 switch (fs->state) { 473 case idle: 474 return; /* XXX shouldn't get here */ 475 476 case locating: 477 if (swim3_readbit(fs, TRACK_ZERO)) { 478 fs->cur_cyl = 0; 479 if (fs->req_cyl == 0) 480 fs->state = do_transfer; 481 else 482 fs->state = seeking; 483 break; 484 } 485 scan_track(fs); 486 return; 487 488 case seeking: 489 if (fs->cur_cyl < 0) { 490 fs->expect_cyl = -1; 491 fs->state = locating; 492 break; 493 } 494 if (fs->req_cyl == fs->cur_cyl) { 495 printk("whoops, seeking 0\n"); 496 fs->state = do_transfer; 497 break; 498 } 499 seek_track(fs, fs->req_cyl - fs->cur_cyl); 500 return; 501 502 case settling: 503 /* check for SEEK_COMPLETE after 30ms */ 504 fs->settle_time = (HZ + 32) / 33; 505 set_timeout(fs, fs->settle_time, settle_timeout); 506 return; 507 508 case do_transfer: 509 if (fs->cur_cyl != fs->req_cyl) { 510 if (fs->retries > 5) { 511 end_request(fd_req, 0); 512 fs->state = idle; 513 return; 514 } 515 fs->state = seeking; 516 break; 517 } 518 setup_transfer(fs); 519 return; 520 521 case jogging: 522 seek_track(fs, -5); 523 return; 524 525 default: 526 printk(KERN_ERR"swim3: unknown state %d\n", fs->state); 527 return; 528 } 529 } 530 } 531 532 static void scan_timeout(unsigned long data) 533 { 534 struct floppy_state *fs = (struct floppy_state *) data; 535 struct swim3 __iomem *sw = fs->swim3; 536 537 fs->timeout_pending = 0; 538 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 539 out_8(&sw->select, RELAX); 540 out_8(&sw->intr_enable, 0); 541 fs->cur_cyl = -1; 542 if (fs->retries > 5) { 543 end_request(fd_req, 0); 544 fs->state = idle; 545 start_request(fs); 546 } else { 547 fs->state = jogging; 548 act(fs); 549 } 550 } 551 552 static void seek_timeout(unsigned long data) 553 { 554 struct floppy_state *fs = (struct floppy_state *) data; 555 struct swim3 __iomem *sw = fs->swim3; 556 557 fs->timeout_pending = 0; 558 out_8(&sw->control_bic, DO_SEEK); 559 out_8(&sw->select, RELAX); 560 out_8(&sw->intr_enable, 0); 561 printk(KERN_ERR "swim3: seek timeout\n"); 562 end_request(fd_req, 0); 563 fs->state = idle; 564 start_request(fs); 565 } 566 567 static void settle_timeout(unsigned long data) 568 { 569 struct floppy_state *fs = (struct floppy_state *) data; 570 struct swim3 __iomem *sw = fs->swim3; 571 572 fs->timeout_pending = 0; 573 if (swim3_readbit(fs, SEEK_COMPLETE)) { 574 out_8(&sw->select, RELAX); 575 fs->state = locating; 576 act(fs); 577 return; 578 } 579 out_8(&sw->select, RELAX); 580 if (fs->settle_time < 2*HZ) { 581 ++fs->settle_time; 582 set_timeout(fs, 1, settle_timeout); 583 return; 584 } 585 printk(KERN_ERR "swim3: seek settle timeout\n"); 586 end_request(fd_req, 0); 587 fs->state = idle; 588 start_request(fs); 589 } 590 591 static void xfer_timeout(unsigned long data) 592 { 593 struct floppy_state *fs = (struct floppy_state *) data; 594 struct swim3 __iomem *sw = fs->swim3; 595 struct dbdma_regs __iomem *dr = fs->dma; 596 struct dbdma_cmd *cp = fs->dma_cmd; 597 unsigned long s; 598 int n; 599 600 fs->timeout_pending = 0; 601 out_le32(&dr->control, RUN << 16); 602 /* We must wait a bit for dbdma to stop */ 603 for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++) 604 udelay(1); 605 out_8(&sw->intr_enable, 0); 606 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); 607 out_8(&sw->select, RELAX); 608 if (rq_data_dir(fd_req) == WRITE) 609 ++cp; 610 if (ld_le16(&cp->xfer_status) != 0) 611 s = fs->scount - ((ld_le16(&cp->res_count) + 511) >> 9); 612 else 613 s = 0; 614 fd_req->sector += s; 615 fd_req->current_nr_sectors -= s; 616 printk(KERN_ERR "swim3: timeout %sing sector %ld\n", 617 (rq_data_dir(fd_req)==WRITE? "writ": "read"), (long)fd_req->sector); 618 end_request(fd_req, 0); 619 fs->state = idle; 620 start_request(fs); 621 } 622 623 static irqreturn_t swim3_interrupt(int irq, void *dev_id) 624 { 625 struct floppy_state *fs = (struct floppy_state *) dev_id; 626 struct swim3 __iomem *sw = fs->swim3; 627 int intr, err, n; 628 int stat, resid; 629 struct dbdma_regs __iomem *dr; 630 struct dbdma_cmd *cp; 631 632 intr = in_8(&sw->intr); 633 err = (intr & ERROR_INTR)? in_8(&sw->error): 0; 634 if ((intr & ERROR_INTR) && fs->state != do_transfer) 635 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%x, intr=%x, err=%x\n", 636 fs->state, rq_data_dir(fd_req), intr, err); 637 switch (fs->state) { 638 case locating: 639 if (intr & SEEN_SECTOR) { 640 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 641 out_8(&sw->select, RELAX); 642 out_8(&sw->intr_enable, 0); 643 del_timer(&fs->timeout); 644 fs->timeout_pending = 0; 645 if (sw->ctrack == 0xff) { 646 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n"); 647 fs->cur_cyl = -1; 648 if (fs->retries > 5) { 649 end_request(fd_req, 0); 650 fs->state = idle; 651 start_request(fs); 652 } else { 653 fs->state = jogging; 654 act(fs); 655 } 656 break; 657 } 658 fs->cur_cyl = sw->ctrack; 659 fs->cur_sector = sw->csect; 660 if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl) 661 printk(KERN_ERR "swim3: expected cyl %d, got %d\n", 662 fs->expect_cyl, fs->cur_cyl); 663 fs->state = do_transfer; 664 act(fs); 665 } 666 break; 667 case seeking: 668 case jogging: 669 if (sw->nseek == 0) { 670 out_8(&sw->control_bic, DO_SEEK); 671 out_8(&sw->select, RELAX); 672 out_8(&sw->intr_enable, 0); 673 del_timer(&fs->timeout); 674 fs->timeout_pending = 0; 675 if (fs->state == seeking) 676 ++fs->retries; 677 fs->state = settling; 678 act(fs); 679 } 680 break; 681 case settling: 682 out_8(&sw->intr_enable, 0); 683 del_timer(&fs->timeout); 684 fs->timeout_pending = 0; 685 act(fs); 686 break; 687 case do_transfer: 688 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0) 689 break; 690 out_8(&sw->intr_enable, 0); 691 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); 692 out_8(&sw->select, RELAX); 693 del_timer(&fs->timeout); 694 fs->timeout_pending = 0; 695 dr = fs->dma; 696 cp = fs->dma_cmd; 697 if (rq_data_dir(fd_req) == WRITE) 698 ++cp; 699 /* 700 * Check that the main data transfer has finished. 701 * On writing, the swim3 sometimes doesn't use 702 * up all the bytes of the postamble, so we can still 703 * see DMA active here. That doesn't matter as long 704 * as all the sector data has been transferred. 705 */ 706 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) { 707 /* wait a little while for DMA to complete */ 708 for (n = 0; n < 100; ++n) { 709 if (cp->xfer_status != 0) 710 break; 711 udelay(1); 712 barrier(); 713 } 714 } 715 /* turn off DMA */ 716 out_le32(&dr->control, (RUN | PAUSE) << 16); 717 stat = ld_le16(&cp->xfer_status); 718 resid = ld_le16(&cp->res_count); 719 if (intr & ERROR_INTR) { 720 n = fs->scount - 1 - resid / 512; 721 if (n > 0) { 722 fd_req->sector += n; 723 fd_req->current_nr_sectors -= n; 724 fd_req->buffer += n * 512; 725 fs->req_sector += n; 726 } 727 if (fs->retries < 5) { 728 ++fs->retries; 729 act(fs); 730 } else { 731 printk("swim3: error %sing block %ld (err=%x)\n", 732 rq_data_dir(fd_req) == WRITE? "writ": "read", 733 (long)fd_req->sector, err); 734 end_request(fd_req, 0); 735 fs->state = idle; 736 } 737 } else { 738 if ((stat & ACTIVE) == 0 || resid != 0) { 739 /* musta been an error */ 740 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid); 741 printk(KERN_ERR " state=%d, dir=%x, intr=%x, err=%x\n", 742 fs->state, rq_data_dir(fd_req), intr, err); 743 end_request(fd_req, 0); 744 fs->state = idle; 745 start_request(fs); 746 break; 747 } 748 fd_req->sector += fs->scount; 749 fd_req->current_nr_sectors -= fs->scount; 750 fd_req->buffer += fs->scount * 512; 751 if (fd_req->current_nr_sectors <= 0) { 752 end_request(fd_req, 1); 753 fs->state = idle; 754 } else { 755 fs->req_sector += fs->scount; 756 if (fs->req_sector > fs->secpertrack) { 757 fs->req_sector -= fs->secpertrack; 758 if (++fs->head > 1) { 759 fs->head = 0; 760 ++fs->req_cyl; 761 } 762 } 763 act(fs); 764 } 765 } 766 if (fs->state == idle) 767 start_request(fs); 768 break; 769 default: 770 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state); 771 } 772 return IRQ_HANDLED; 773 } 774 775 /* 776 static void fd_dma_interrupt(int irq, void *dev_id) 777 { 778 } 779 */ 780 781 static int grab_drive(struct floppy_state *fs, enum swim_state state, 782 int interruptible) 783 { 784 unsigned long flags; 785 786 spin_lock_irqsave(&fs->lock, flags); 787 if (fs->state != idle) { 788 ++fs->wanted; 789 while (fs->state != available) { 790 if (interruptible && signal_pending(current)) { 791 --fs->wanted; 792 spin_unlock_irqrestore(&fs->lock, flags); 793 return -EINTR; 794 } 795 interruptible_sleep_on(&fs->wait); 796 } 797 --fs->wanted; 798 } 799 fs->state = state; 800 spin_unlock_irqrestore(&fs->lock, flags); 801 return 0; 802 } 803 804 static void release_drive(struct floppy_state *fs) 805 { 806 unsigned long flags; 807 808 spin_lock_irqsave(&fs->lock, flags); 809 fs->state = idle; 810 start_request(fs); 811 spin_unlock_irqrestore(&fs->lock, flags); 812 } 813 814 static int fd_eject(struct floppy_state *fs) 815 { 816 int err, n; 817 818 err = grab_drive(fs, ejecting, 1); 819 if (err) 820 return err; 821 swim3_action(fs, EJECT); 822 for (n = 20; n > 0; --n) { 823 if (signal_pending(current)) { 824 err = -EINTR; 825 break; 826 } 827 swim3_select(fs, RELAX); 828 schedule_timeout_interruptible(1); 829 if (swim3_readbit(fs, DISK_IN) == 0) 830 break; 831 } 832 swim3_select(fs, RELAX); 833 udelay(150); 834 fs->ejected = 1; 835 release_drive(fs); 836 return err; 837 } 838 839 static struct floppy_struct floppy_type = 840 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */ 841 842 static int floppy_ioctl(struct block_device *bdev, fmode_t mode, 843 unsigned int cmd, unsigned long param) 844 { 845 struct floppy_state *fs = bdev->bd_disk->private_data; 846 int err; 847 848 if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)) 849 return -EPERM; 850 851 #ifdef CONFIG_PMAC_MEDIABAY 852 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD)) 853 return -ENXIO; 854 #endif 855 856 switch (cmd) { 857 case FDEJECT: 858 if (fs->ref_count != 1) 859 return -EBUSY; 860 err = fd_eject(fs); 861 return err; 862 case FDGETPRM: 863 if (copy_to_user((void __user *) param, &floppy_type, 864 sizeof(struct floppy_struct))) 865 return -EFAULT; 866 return 0; 867 } 868 return -ENOTTY; 869 } 870 871 static int floppy_open(struct block_device *bdev, fmode_t mode) 872 { 873 struct floppy_state *fs = bdev->bd_disk->private_data; 874 struct swim3 __iomem *sw = fs->swim3; 875 int n, err = 0; 876 877 if (fs->ref_count == 0) { 878 #ifdef CONFIG_PMAC_MEDIABAY 879 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD)) 880 return -ENXIO; 881 #endif 882 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2); 883 out_8(&sw->control_bic, 0xff); 884 out_8(&sw->mode, 0x95); 885 udelay(10); 886 out_8(&sw->intr_enable, 0); 887 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE); 888 swim3_action(fs, MOTOR_ON); 889 fs->write_prot = -1; 890 fs->cur_cyl = -1; 891 for (n = 0; n < 2 * HZ; ++n) { 892 if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE)) 893 break; 894 if (signal_pending(current)) { 895 err = -EINTR; 896 break; 897 } 898 swim3_select(fs, RELAX); 899 schedule_timeout_interruptible(1); 900 } 901 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0 902 || swim3_readbit(fs, DISK_IN) == 0)) 903 err = -ENXIO; 904 swim3_action(fs, SETMFM); 905 swim3_select(fs, RELAX); 906 907 } else if (fs->ref_count == -1 || mode & FMODE_EXCL) 908 return -EBUSY; 909 910 if (err == 0 && (mode & FMODE_NDELAY) == 0 911 && (mode & (FMODE_READ|FMODE_WRITE))) { 912 check_disk_change(bdev); 913 if (fs->ejected) 914 err = -ENXIO; 915 } 916 917 if (err == 0 && (mode & FMODE_WRITE)) { 918 if (fs->write_prot < 0) 919 fs->write_prot = swim3_readbit(fs, WRITE_PROT); 920 if (fs->write_prot) 921 err = -EROFS; 922 } 923 924 if (err) { 925 if (fs->ref_count == 0) { 926 swim3_action(fs, MOTOR_OFF); 927 out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE); 928 swim3_select(fs, RELAX); 929 } 930 return err; 931 } 932 933 if (mode & FMODE_EXCL) 934 fs->ref_count = -1; 935 else 936 ++fs->ref_count; 937 938 return 0; 939 } 940 941 static int floppy_release(struct gendisk *disk, fmode_t mode) 942 { 943 struct floppy_state *fs = disk->private_data; 944 struct swim3 __iomem *sw = fs->swim3; 945 if (fs->ref_count > 0 && --fs->ref_count == 0) { 946 swim3_action(fs, MOTOR_OFF); 947 out_8(&sw->control_bic, 0xff); 948 swim3_select(fs, RELAX); 949 } 950 return 0; 951 } 952 953 static int floppy_check_change(struct gendisk *disk) 954 { 955 struct floppy_state *fs = disk->private_data; 956 return fs->ejected; 957 } 958 959 static int floppy_revalidate(struct gendisk *disk) 960 { 961 struct floppy_state *fs = disk->private_data; 962 struct swim3 __iomem *sw; 963 int ret, n; 964 965 #ifdef CONFIG_PMAC_MEDIABAY 966 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD)) 967 return -ENXIO; 968 #endif 969 970 sw = fs->swim3; 971 grab_drive(fs, revalidating, 0); 972 out_8(&sw->intr_enable, 0); 973 out_8(&sw->control_bis, DRIVE_ENABLE); 974 swim3_action(fs, MOTOR_ON); /* necessary? */ 975 fs->write_prot = -1; 976 fs->cur_cyl = -1; 977 mdelay(1); 978 for (n = HZ; n > 0; --n) { 979 if (swim3_readbit(fs, SEEK_COMPLETE)) 980 break; 981 if (signal_pending(current)) 982 break; 983 swim3_select(fs, RELAX); 984 schedule_timeout_interruptible(1); 985 } 986 ret = swim3_readbit(fs, SEEK_COMPLETE) == 0 987 || swim3_readbit(fs, DISK_IN) == 0; 988 if (ret) 989 swim3_action(fs, MOTOR_OFF); 990 else { 991 fs->ejected = 0; 992 swim3_action(fs, SETMFM); 993 } 994 swim3_select(fs, RELAX); 995 996 release_drive(fs); 997 return ret; 998 } 999 1000 static struct block_device_operations floppy_fops = { 1001 .open = floppy_open, 1002 .release = floppy_release, 1003 .locked_ioctl = floppy_ioctl, 1004 .media_changed = floppy_check_change, 1005 .revalidate_disk= floppy_revalidate, 1006 }; 1007 1008 static int swim3_add_device(struct macio_dev *mdev, int index) 1009 { 1010 struct device_node *swim = mdev->ofdev.node; 1011 struct device_node *mediabay; 1012 struct floppy_state *fs = &floppy_states[index]; 1013 int rc = -EBUSY; 1014 1015 /* Check & Request resources */ 1016 if (macio_resource_count(mdev) < 2) { 1017 printk(KERN_WARNING "ifd%d: no address for %s\n", 1018 index, swim->full_name); 1019 return -ENXIO; 1020 } 1021 if (macio_irq_count(mdev) < 2) { 1022 printk(KERN_WARNING "fd%d: no intrs for device %s\n", 1023 index, swim->full_name); 1024 } 1025 if (macio_request_resource(mdev, 0, "swim3 (mmio)")) { 1026 printk(KERN_ERR "fd%d: can't request mmio resource for %s\n", 1027 index, swim->full_name); 1028 return -EBUSY; 1029 } 1030 if (macio_request_resource(mdev, 1, "swim3 (dma)")) { 1031 printk(KERN_ERR "fd%d: can't request dma resource for %s\n", 1032 index, swim->full_name); 1033 macio_release_resource(mdev, 0); 1034 return -EBUSY; 1035 } 1036 dev_set_drvdata(&mdev->ofdev.dev, fs); 1037 1038 mediabay = (strcasecmp(swim->parent->type, "media-bay") == 0) ? 1039 swim->parent : NULL; 1040 if (mediabay == NULL) 1041 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1); 1042 1043 memset(fs, 0, sizeof(*fs)); 1044 spin_lock_init(&fs->lock); 1045 fs->state = idle; 1046 fs->swim3 = (struct swim3 __iomem *) 1047 ioremap(macio_resource_start(mdev, 0), 0x200); 1048 if (fs->swim3 == NULL) { 1049 printk("fd%d: couldn't map registers for %s\n", 1050 index, swim->full_name); 1051 rc = -ENOMEM; 1052 goto out_release; 1053 } 1054 fs->dma = (struct dbdma_regs __iomem *) 1055 ioremap(macio_resource_start(mdev, 1), 0x200); 1056 if (fs->dma == NULL) { 1057 printk("fd%d: couldn't map DMA for %s\n", 1058 index, swim->full_name); 1059 iounmap(fs->swim3); 1060 rc = -ENOMEM; 1061 goto out_release; 1062 } 1063 fs->swim3_intr = macio_irq(mdev, 0); 1064 fs->dma_intr = macio_irq(mdev, 1);; 1065 fs->cur_cyl = -1; 1066 fs->cur_sector = -1; 1067 fs->secpercyl = 36; 1068 fs->secpertrack = 18; 1069 fs->total_secs = 2880; 1070 fs->media_bay = mediabay; 1071 init_waitqueue_head(&fs->wait); 1072 1073 fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space); 1074 memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd)); 1075 st_le16(&fs->dma_cmd[1].command, DBDMA_STOP); 1076 1077 if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) { 1078 printk(KERN_ERR "fd%d: couldn't request irq %d for %s\n", 1079 index, fs->swim3_intr, swim->full_name); 1080 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0); 1081 goto out_unmap; 1082 return -EBUSY; 1083 } 1084 /* 1085 if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) { 1086 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA", 1087 fs->dma_intr); 1088 return -EBUSY; 1089 } 1090 */ 1091 1092 init_timer(&fs->timeout); 1093 1094 printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count, 1095 mediabay ? "in media bay" : ""); 1096 1097 return 0; 1098 1099 out_unmap: 1100 iounmap(fs->dma); 1101 iounmap(fs->swim3); 1102 1103 out_release: 1104 macio_release_resource(mdev, 0); 1105 macio_release_resource(mdev, 1); 1106 1107 return rc; 1108 } 1109 1110 static int __devinit swim3_attach(struct macio_dev *mdev, const struct of_device_id *match) 1111 { 1112 int i, rc; 1113 struct gendisk *disk; 1114 1115 /* Add the drive */ 1116 rc = swim3_add_device(mdev, floppy_count); 1117 if (rc) 1118 return rc; 1119 1120 /* Now create the queue if not there yet */ 1121 if (swim3_queue == NULL) { 1122 /* If we failed, there isn't much we can do as the driver is still 1123 * too dumb to remove the device, just bail out 1124 */ 1125 if (register_blkdev(FLOPPY_MAJOR, "fd")) 1126 return 0; 1127 swim3_queue = blk_init_queue(do_fd_request, &swim3_lock); 1128 if (swim3_queue == NULL) { 1129 unregister_blkdev(FLOPPY_MAJOR, "fd"); 1130 return 0; 1131 } 1132 } 1133 1134 /* Now register that disk. Same comment about failure handling */ 1135 i = floppy_count++; 1136 disk = disks[i] = alloc_disk(1); 1137 if (disk == NULL) 1138 return 0; 1139 1140 disk->major = FLOPPY_MAJOR; 1141 disk->first_minor = i; 1142 disk->fops = &floppy_fops; 1143 disk->private_data = &floppy_states[i]; 1144 disk->queue = swim3_queue; 1145 disk->flags |= GENHD_FL_REMOVABLE; 1146 sprintf(disk->disk_name, "fd%d", i); 1147 set_capacity(disk, 2880); 1148 add_disk(disk); 1149 1150 return 0; 1151 } 1152 1153 static struct of_device_id swim3_match[] = 1154 { 1155 { 1156 .name = "swim3", 1157 }, 1158 { 1159 .compatible = "ohare-swim3" 1160 }, 1161 { 1162 .compatible = "swim3" 1163 }, 1164 }; 1165 1166 static struct macio_driver swim3_driver = 1167 { 1168 .name = "swim3", 1169 .match_table = swim3_match, 1170 .probe = swim3_attach, 1171 #if 0 1172 .suspend = swim3_suspend, 1173 .resume = swim3_resume, 1174 #endif 1175 }; 1176 1177 1178 int swim3_init(void) 1179 { 1180 macio_register_driver(&swim3_driver); 1181 return 0; 1182 } 1183 1184 module_init(swim3_init) 1185 1186 MODULE_LICENSE("GPL"); 1187 MODULE_AUTHOR("Paul Mackerras"); 1188 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR); 1189