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/smp_lock.h> 29 #include <linux/module.h> 30 #include <linux/spinlock.h> 31 #include <asm/io.h> 32 #include <asm/dbdma.h> 33 #include <asm/prom.h> 34 #include <asm/uaccess.h> 35 #include <asm/mediabay.h> 36 #include <asm/machdep.h> 37 #include <asm/pmac_feature.h> 38 39 static struct request_queue *swim3_queue; 40 static struct gendisk *disks[2]; 41 static struct request *fd_req; 42 43 #define MAX_FLOPPIES 2 44 45 enum swim_state { 46 idle, 47 locating, 48 seeking, 49 settling, 50 do_transfer, 51 jogging, 52 available, 53 revalidating, 54 ejecting 55 }; 56 57 #define REG(x) unsigned char x; char x ## _pad[15]; 58 59 /* 60 * The names for these registers mostly represent speculation on my part. 61 * It will be interesting to see how close they are to the names Apple uses. 62 */ 63 struct swim3 { 64 REG(data); 65 REG(timer); /* counts down at 1MHz */ 66 REG(error); 67 REG(mode); 68 REG(select); /* controls CA0, CA1, CA2 and LSTRB signals */ 69 REG(setup); 70 REG(control); /* writing bits clears them */ 71 REG(status); /* writing bits sets them in control */ 72 REG(intr); 73 REG(nseek); /* # tracks to seek */ 74 REG(ctrack); /* current track number */ 75 REG(csect); /* current sector number */ 76 REG(gap3); /* size of gap 3 in track format */ 77 REG(sector); /* sector # to read or write */ 78 REG(nsect); /* # sectors to read or write */ 79 REG(intr_enable); 80 }; 81 82 #define control_bic control 83 #define control_bis status 84 85 /* Bits in select register */ 86 #define CA_MASK 7 87 #define LSTRB 8 88 89 /* Bits in control register */ 90 #define DO_SEEK 0x80 91 #define FORMAT 0x40 92 #define SELECT 0x20 93 #define WRITE_SECTORS 0x10 94 #define DO_ACTION 0x08 95 #define DRIVE2_ENABLE 0x04 96 #define DRIVE_ENABLE 0x02 97 #define INTR_ENABLE 0x01 98 99 /* Bits in status register */ 100 #define FIFO_1BYTE 0x80 101 #define FIFO_2BYTE 0x40 102 #define ERROR 0x20 103 #define DATA 0x08 104 #define RDDATA 0x04 105 #define INTR_PENDING 0x02 106 #define MARK_BYTE 0x01 107 108 /* Bits in intr and intr_enable registers */ 109 #define ERROR_INTR 0x20 110 #define DATA_CHANGED 0x10 111 #define TRANSFER_DONE 0x08 112 #define SEEN_SECTOR 0x04 113 #define SEEK_DONE 0x02 114 #define TIMER_DONE 0x01 115 116 /* Bits in error register */ 117 #define ERR_DATA_CRC 0x80 118 #define ERR_ADDR_CRC 0x40 119 #define ERR_OVERRUN 0x04 120 #define ERR_UNDERRUN 0x01 121 122 /* Bits in setup register */ 123 #define S_SW_RESET 0x80 124 #define S_GCR_WRITE 0x40 125 #define S_IBM_DRIVE 0x20 126 #define S_TEST_MODE 0x10 127 #define S_FCLK_DIV2 0x08 128 #define S_GCR 0x04 129 #define S_COPY_PROT 0x02 130 #define S_INV_WDATA 0x01 131 132 /* Select values for swim3_action */ 133 #define SEEK_POSITIVE 0 134 #define SEEK_NEGATIVE 4 135 #define STEP 1 136 #define MOTOR_ON 2 137 #define MOTOR_OFF 6 138 #define INDEX 3 139 #define EJECT 7 140 #define SETMFM 9 141 #define SETGCR 13 142 143 /* Select values for swim3_select and swim3_readbit */ 144 #define STEP_DIR 0 145 #define STEPPING 1 146 #define MOTOR_ON 2 147 #define RELAX 3 /* also eject in progress */ 148 #define READ_DATA_0 4 149 #define TWOMEG_DRIVE 5 150 #define SINGLE_SIDED 6 /* drive or diskette is 4MB type? */ 151 #define DRIVE_PRESENT 7 152 #define DISK_IN 8 153 #define WRITE_PROT 9 154 #define TRACK_ZERO 10 155 #define TACHO 11 156 #define READ_DATA_1 12 157 #define MFM_MODE 13 158 #define SEEK_COMPLETE 14 159 #define ONEMEG_MEDIA 15 160 161 /* Definitions of values used in writing and formatting */ 162 #define DATA_ESCAPE 0x99 163 #define GCR_SYNC_EXC 0x3f 164 #define GCR_SYNC_CONV 0x80 165 #define GCR_FIRST_MARK 0xd5 166 #define GCR_SECOND_MARK 0xaa 167 #define GCR_ADDR_MARK "\xd5\xaa\x00" 168 #define GCR_DATA_MARK "\xd5\xaa\x0b" 169 #define GCR_SLIP_BYTE "\x27\xaa" 170 #define GCR_SELF_SYNC "\x3f\xbf\x1e\x34\x3c\x3f" 171 172 #define DATA_99 "\x99\x99" 173 #define MFM_ADDR_MARK "\x99\xa1\x99\xa1\x99\xa1\x99\xfe" 174 #define MFM_INDEX_MARK "\x99\xc2\x99\xc2\x99\xc2\x99\xfc" 175 #define MFM_GAP_LEN 12 176 177 struct floppy_state { 178 enum swim_state state; 179 spinlock_t lock; 180 struct swim3 __iomem *swim3; /* hardware registers */ 181 struct dbdma_regs __iomem *dma; /* DMA controller registers */ 182 int swim3_intr; /* interrupt number for SWIM3 */ 183 int dma_intr; /* interrupt number for DMA channel */ 184 int cur_cyl; /* cylinder head is on, or -1 */ 185 int cur_sector; /* last sector we saw go past */ 186 int req_cyl; /* the cylinder for the current r/w request */ 187 int head; /* head number ditto */ 188 int req_sector; /* sector number ditto */ 189 int scount; /* # sectors we're transferring at present */ 190 int retries; 191 int settle_time; 192 int secpercyl; /* disk geometry information */ 193 int secpertrack; 194 int total_secs; 195 int write_prot; /* 1 if write-protected, 0 if not, -1 dunno */ 196 struct dbdma_cmd *dma_cmd; 197 int ref_count; 198 int expect_cyl; 199 struct timer_list timeout; 200 int timeout_pending; 201 int ejected; 202 wait_queue_head_t wait; 203 int wanted; 204 struct macio_dev *mdev; 205 char dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)]; 206 }; 207 208 static struct floppy_state floppy_states[MAX_FLOPPIES]; 209 static int floppy_count = 0; 210 static DEFINE_SPINLOCK(swim3_lock); 211 212 static unsigned short write_preamble[] = { 213 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */ 214 0, 0, 0, 0, 0, 0, /* sync field */ 215 0x99a1, 0x99a1, 0x99a1, 0x99fb, /* data address mark */ 216 0x990f /* no escape for 512 bytes */ 217 }; 218 219 static unsigned short write_postamble[] = { 220 0x9904, /* insert CRC */ 221 0x4e4e, 0x4e4e, 222 0x9908, /* stop writing */ 223 0, 0, 0, 0, 0, 0 224 }; 225 226 static void swim3_select(struct floppy_state *fs, int sel); 227 static void swim3_action(struct floppy_state *fs, int action); 228 static int swim3_readbit(struct floppy_state *fs, int bit); 229 static void do_fd_request(struct request_queue * q); 230 static void start_request(struct floppy_state *fs); 231 static void set_timeout(struct floppy_state *fs, int nticks, 232 void (*proc)(unsigned long)); 233 static void scan_track(struct floppy_state *fs); 234 static void seek_track(struct floppy_state *fs, int n); 235 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count); 236 static void setup_transfer(struct floppy_state *fs); 237 static void act(struct floppy_state *fs); 238 static void scan_timeout(unsigned long data); 239 static void seek_timeout(unsigned long data); 240 static void settle_timeout(unsigned long data); 241 static void xfer_timeout(unsigned long data); 242 static irqreturn_t swim3_interrupt(int irq, void *dev_id); 243 /*static void fd_dma_interrupt(int irq, void *dev_id);*/ 244 static int grab_drive(struct floppy_state *fs, enum swim_state state, 245 int interruptible); 246 static void release_drive(struct floppy_state *fs); 247 static int fd_eject(struct floppy_state *fs); 248 static int floppy_ioctl(struct block_device *bdev, fmode_t mode, 249 unsigned int cmd, unsigned long param); 250 static int floppy_open(struct block_device *bdev, fmode_t mode); 251 static int floppy_release(struct gendisk *disk, fmode_t mode); 252 static int floppy_check_change(struct gendisk *disk); 253 static int floppy_revalidate(struct gendisk *disk); 254 255 static bool swim3_end_request(int err, unsigned int nr_bytes) 256 { 257 if (__blk_end_request(fd_req, err, nr_bytes)) 258 return true; 259 260 fd_req = NULL; 261 return false; 262 } 263 264 static bool swim3_end_request_cur(int err) 265 { 266 return swim3_end_request(err, blk_rq_cur_bytes(fd_req)); 267 } 268 269 static void swim3_select(struct floppy_state *fs, int sel) 270 { 271 struct swim3 __iomem *sw = fs->swim3; 272 273 out_8(&sw->select, RELAX); 274 if (sel & 8) 275 out_8(&sw->control_bis, SELECT); 276 else 277 out_8(&sw->control_bic, SELECT); 278 out_8(&sw->select, sel & CA_MASK); 279 } 280 281 static void swim3_action(struct floppy_state *fs, int action) 282 { 283 struct swim3 __iomem *sw = fs->swim3; 284 285 swim3_select(fs, action); 286 udelay(1); 287 out_8(&sw->select, sw->select | LSTRB); 288 udelay(2); 289 out_8(&sw->select, sw->select & ~LSTRB); 290 udelay(1); 291 } 292 293 static int swim3_readbit(struct floppy_state *fs, int bit) 294 { 295 struct swim3 __iomem *sw = fs->swim3; 296 int stat; 297 298 swim3_select(fs, bit); 299 udelay(1); 300 stat = in_8(&sw->status); 301 return (stat & DATA) == 0; 302 } 303 304 static void do_fd_request(struct request_queue * q) 305 { 306 int i; 307 308 for(i=0; i<floppy_count; i++) { 309 struct floppy_state *fs = &floppy_states[i]; 310 if (fs->mdev->media_bay && 311 check_media_bay(fs->mdev->media_bay) != MB_FD) 312 continue; 313 start_request(fs); 314 } 315 } 316 317 static void start_request(struct floppy_state *fs) 318 { 319 struct request *req; 320 unsigned long x; 321 322 if (fs->state == idle && fs->wanted) { 323 fs->state = available; 324 wake_up(&fs->wait); 325 return; 326 } 327 while (fs->state == idle) { 328 if (!fd_req) { 329 fd_req = blk_fetch_request(swim3_queue); 330 if (!fd_req) 331 break; 332 } 333 req = fd_req; 334 #if 0 335 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n", 336 req->rq_disk->disk_name, req->cmd, 337 (long)blk_rq_pos(req), blk_rq_sectors(req), req->buffer); 338 printk(" errors=%d current_nr_sectors=%u\n", 339 req->errors, blk_rq_cur_sectors(req)); 340 #endif 341 342 if (blk_rq_pos(req) >= fs->total_secs) { 343 swim3_end_request_cur(-EIO); 344 continue; 345 } 346 if (fs->ejected) { 347 swim3_end_request_cur(-EIO); 348 continue; 349 } 350 351 if (rq_data_dir(req) == WRITE) { 352 if (fs->write_prot < 0) 353 fs->write_prot = swim3_readbit(fs, WRITE_PROT); 354 if (fs->write_prot) { 355 swim3_end_request_cur(-EIO); 356 continue; 357 } 358 } 359 360 /* Do not remove the cast. blk_rq_pos(req) is now a 361 * sector_t and can be 64 bits, but it will never go 362 * past 32 bits for this driver anyway, so we can 363 * safely cast it down and not have to do a 64/32 364 * division 365 */ 366 fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl; 367 x = ((long)blk_rq_pos(req)) % fs->secpercyl; 368 fs->head = x / fs->secpertrack; 369 fs->req_sector = x % fs->secpertrack + 1; 370 fd_req = req; 371 fs->state = do_transfer; 372 fs->retries = 0; 373 374 act(fs); 375 } 376 } 377 378 static void set_timeout(struct floppy_state *fs, int nticks, 379 void (*proc)(unsigned long)) 380 { 381 unsigned long flags; 382 383 spin_lock_irqsave(&fs->lock, flags); 384 if (fs->timeout_pending) 385 del_timer(&fs->timeout); 386 fs->timeout.expires = jiffies + nticks; 387 fs->timeout.function = proc; 388 fs->timeout.data = (unsigned long) fs; 389 add_timer(&fs->timeout); 390 fs->timeout_pending = 1; 391 spin_unlock_irqrestore(&fs->lock, flags); 392 } 393 394 static inline void scan_track(struct floppy_state *fs) 395 { 396 struct swim3 __iomem *sw = fs->swim3; 397 398 swim3_select(fs, READ_DATA_0); 399 in_8(&sw->intr); /* clear SEEN_SECTOR bit */ 400 in_8(&sw->error); 401 out_8(&sw->intr_enable, SEEN_SECTOR); 402 out_8(&sw->control_bis, DO_ACTION); 403 /* enable intr when track found */ 404 set_timeout(fs, HZ, scan_timeout); /* enable timeout */ 405 } 406 407 static inline void seek_track(struct floppy_state *fs, int n) 408 { 409 struct swim3 __iomem *sw = fs->swim3; 410 411 if (n >= 0) { 412 swim3_action(fs, SEEK_POSITIVE); 413 sw->nseek = n; 414 } else { 415 swim3_action(fs, SEEK_NEGATIVE); 416 sw->nseek = -n; 417 } 418 fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1; 419 swim3_select(fs, STEP); 420 in_8(&sw->error); 421 /* enable intr when seek finished */ 422 out_8(&sw->intr_enable, SEEK_DONE); 423 out_8(&sw->control_bis, DO_SEEK); 424 set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */ 425 fs->settle_time = 0; 426 } 427 428 static inline void init_dma(struct dbdma_cmd *cp, int cmd, 429 void *buf, int count) 430 { 431 st_le16(&cp->req_count, count); 432 st_le16(&cp->command, cmd); 433 st_le32(&cp->phy_addr, virt_to_bus(buf)); 434 cp->xfer_status = 0; 435 } 436 437 static inline void setup_transfer(struct floppy_state *fs) 438 { 439 int n; 440 struct swim3 __iomem *sw = fs->swim3; 441 struct dbdma_cmd *cp = fs->dma_cmd; 442 struct dbdma_regs __iomem *dr = fs->dma; 443 444 if (blk_rq_cur_sectors(fd_req) <= 0) { 445 printk(KERN_ERR "swim3: transfer 0 sectors?\n"); 446 return; 447 } 448 if (rq_data_dir(fd_req) == WRITE) 449 n = 1; 450 else { 451 n = fs->secpertrack - fs->req_sector + 1; 452 if (n > blk_rq_cur_sectors(fd_req)) 453 n = blk_rq_cur_sectors(fd_req); 454 } 455 fs->scount = n; 456 swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0); 457 out_8(&sw->sector, fs->req_sector); 458 out_8(&sw->nsect, n); 459 out_8(&sw->gap3, 0); 460 out_le32(&dr->cmdptr, virt_to_bus(cp)); 461 if (rq_data_dir(fd_req) == WRITE) { 462 /* Set up 3 dma commands: write preamble, data, postamble */ 463 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble)); 464 ++cp; 465 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512); 466 ++cp; 467 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble)); 468 } else { 469 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512); 470 } 471 ++cp; 472 out_le16(&cp->command, DBDMA_STOP); 473 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 474 in_8(&sw->error); 475 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 476 if (rq_data_dir(fd_req) == WRITE) 477 out_8(&sw->control_bis, WRITE_SECTORS); 478 in_8(&sw->intr); 479 out_le32(&dr->control, (RUN << 16) | RUN); 480 /* enable intr when transfer complete */ 481 out_8(&sw->intr_enable, TRANSFER_DONE); 482 out_8(&sw->control_bis, DO_ACTION); 483 set_timeout(fs, 2*HZ, xfer_timeout); /* enable timeout */ 484 } 485 486 static void act(struct floppy_state *fs) 487 { 488 for (;;) { 489 switch (fs->state) { 490 case idle: 491 return; /* XXX shouldn't get here */ 492 493 case locating: 494 if (swim3_readbit(fs, TRACK_ZERO)) { 495 fs->cur_cyl = 0; 496 if (fs->req_cyl == 0) 497 fs->state = do_transfer; 498 else 499 fs->state = seeking; 500 break; 501 } 502 scan_track(fs); 503 return; 504 505 case seeking: 506 if (fs->cur_cyl < 0) { 507 fs->expect_cyl = -1; 508 fs->state = locating; 509 break; 510 } 511 if (fs->req_cyl == fs->cur_cyl) { 512 printk("whoops, seeking 0\n"); 513 fs->state = do_transfer; 514 break; 515 } 516 seek_track(fs, fs->req_cyl - fs->cur_cyl); 517 return; 518 519 case settling: 520 /* check for SEEK_COMPLETE after 30ms */ 521 fs->settle_time = (HZ + 32) / 33; 522 set_timeout(fs, fs->settle_time, settle_timeout); 523 return; 524 525 case do_transfer: 526 if (fs->cur_cyl != fs->req_cyl) { 527 if (fs->retries > 5) { 528 swim3_end_request_cur(-EIO); 529 fs->state = idle; 530 return; 531 } 532 fs->state = seeking; 533 break; 534 } 535 setup_transfer(fs); 536 return; 537 538 case jogging: 539 seek_track(fs, -5); 540 return; 541 542 default: 543 printk(KERN_ERR"swim3: unknown state %d\n", fs->state); 544 return; 545 } 546 } 547 } 548 549 static void scan_timeout(unsigned long data) 550 { 551 struct floppy_state *fs = (struct floppy_state *) data; 552 struct swim3 __iomem *sw = fs->swim3; 553 554 fs->timeout_pending = 0; 555 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 556 out_8(&sw->select, RELAX); 557 out_8(&sw->intr_enable, 0); 558 fs->cur_cyl = -1; 559 if (fs->retries > 5) { 560 swim3_end_request_cur(-EIO); 561 fs->state = idle; 562 start_request(fs); 563 } else { 564 fs->state = jogging; 565 act(fs); 566 } 567 } 568 569 static void seek_timeout(unsigned long data) 570 { 571 struct floppy_state *fs = (struct floppy_state *) data; 572 struct swim3 __iomem *sw = fs->swim3; 573 574 fs->timeout_pending = 0; 575 out_8(&sw->control_bic, DO_SEEK); 576 out_8(&sw->select, RELAX); 577 out_8(&sw->intr_enable, 0); 578 printk(KERN_ERR "swim3: seek timeout\n"); 579 swim3_end_request_cur(-EIO); 580 fs->state = idle; 581 start_request(fs); 582 } 583 584 static void settle_timeout(unsigned long data) 585 { 586 struct floppy_state *fs = (struct floppy_state *) data; 587 struct swim3 __iomem *sw = fs->swim3; 588 589 fs->timeout_pending = 0; 590 if (swim3_readbit(fs, SEEK_COMPLETE)) { 591 out_8(&sw->select, RELAX); 592 fs->state = locating; 593 act(fs); 594 return; 595 } 596 out_8(&sw->select, RELAX); 597 if (fs->settle_time < 2*HZ) { 598 ++fs->settle_time; 599 set_timeout(fs, 1, settle_timeout); 600 return; 601 } 602 printk(KERN_ERR "swim3: seek settle timeout\n"); 603 swim3_end_request_cur(-EIO); 604 fs->state = idle; 605 start_request(fs); 606 } 607 608 static void xfer_timeout(unsigned long data) 609 { 610 struct floppy_state *fs = (struct floppy_state *) data; 611 struct swim3 __iomem *sw = fs->swim3; 612 struct dbdma_regs __iomem *dr = fs->dma; 613 int n; 614 615 fs->timeout_pending = 0; 616 out_le32(&dr->control, RUN << 16); 617 /* We must wait a bit for dbdma to stop */ 618 for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++) 619 udelay(1); 620 out_8(&sw->intr_enable, 0); 621 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); 622 out_8(&sw->select, RELAX); 623 printk(KERN_ERR "swim3: timeout %sing sector %ld\n", 624 (rq_data_dir(fd_req)==WRITE? "writ": "read"), 625 (long)blk_rq_pos(fd_req)); 626 swim3_end_request_cur(-EIO); 627 fs->state = idle; 628 start_request(fs); 629 } 630 631 static irqreturn_t swim3_interrupt(int irq, void *dev_id) 632 { 633 struct floppy_state *fs = (struct floppy_state *) dev_id; 634 struct swim3 __iomem *sw = fs->swim3; 635 int intr, err, n; 636 int stat, resid; 637 struct dbdma_regs __iomem *dr; 638 struct dbdma_cmd *cp; 639 640 intr = in_8(&sw->intr); 641 err = (intr & ERROR_INTR)? in_8(&sw->error): 0; 642 if ((intr & ERROR_INTR) && fs->state != do_transfer) 643 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%x, intr=%x, err=%x\n", 644 fs->state, rq_data_dir(fd_req), intr, err); 645 switch (fs->state) { 646 case locating: 647 if (intr & SEEN_SECTOR) { 648 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 649 out_8(&sw->select, RELAX); 650 out_8(&sw->intr_enable, 0); 651 del_timer(&fs->timeout); 652 fs->timeout_pending = 0; 653 if (sw->ctrack == 0xff) { 654 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n"); 655 fs->cur_cyl = -1; 656 if (fs->retries > 5) { 657 swim3_end_request_cur(-EIO); 658 fs->state = idle; 659 start_request(fs); 660 } else { 661 fs->state = jogging; 662 act(fs); 663 } 664 break; 665 } 666 fs->cur_cyl = sw->ctrack; 667 fs->cur_sector = sw->csect; 668 if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl) 669 printk(KERN_ERR "swim3: expected cyl %d, got %d\n", 670 fs->expect_cyl, fs->cur_cyl); 671 fs->state = do_transfer; 672 act(fs); 673 } 674 break; 675 case seeking: 676 case jogging: 677 if (sw->nseek == 0) { 678 out_8(&sw->control_bic, DO_SEEK); 679 out_8(&sw->select, RELAX); 680 out_8(&sw->intr_enable, 0); 681 del_timer(&fs->timeout); 682 fs->timeout_pending = 0; 683 if (fs->state == seeking) 684 ++fs->retries; 685 fs->state = settling; 686 act(fs); 687 } 688 break; 689 case settling: 690 out_8(&sw->intr_enable, 0); 691 del_timer(&fs->timeout); 692 fs->timeout_pending = 0; 693 act(fs); 694 break; 695 case do_transfer: 696 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0) 697 break; 698 out_8(&sw->intr_enable, 0); 699 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); 700 out_8(&sw->select, RELAX); 701 del_timer(&fs->timeout); 702 fs->timeout_pending = 0; 703 dr = fs->dma; 704 cp = fs->dma_cmd; 705 if (rq_data_dir(fd_req) == WRITE) 706 ++cp; 707 /* 708 * Check that the main data transfer has finished. 709 * On writing, the swim3 sometimes doesn't use 710 * up all the bytes of the postamble, so we can still 711 * see DMA active here. That doesn't matter as long 712 * as all the sector data has been transferred. 713 */ 714 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) { 715 /* wait a little while for DMA to complete */ 716 for (n = 0; n < 100; ++n) { 717 if (cp->xfer_status != 0) 718 break; 719 udelay(1); 720 barrier(); 721 } 722 } 723 /* turn off DMA */ 724 out_le32(&dr->control, (RUN | PAUSE) << 16); 725 stat = ld_le16(&cp->xfer_status); 726 resid = ld_le16(&cp->res_count); 727 if (intr & ERROR_INTR) { 728 n = fs->scount - 1 - resid / 512; 729 if (n > 0) { 730 blk_update_request(fd_req, 0, n << 9); 731 fs->req_sector += n; 732 } 733 if (fs->retries < 5) { 734 ++fs->retries; 735 act(fs); 736 } else { 737 printk("swim3: error %sing block %ld (err=%x)\n", 738 rq_data_dir(fd_req) == WRITE? "writ": "read", 739 (long)blk_rq_pos(fd_req), err); 740 swim3_end_request_cur(-EIO); 741 fs->state = idle; 742 } 743 } else { 744 if ((stat & ACTIVE) == 0 || resid != 0) { 745 /* musta been an error */ 746 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid); 747 printk(KERN_ERR " state=%d, dir=%x, intr=%x, err=%x\n", 748 fs->state, rq_data_dir(fd_req), intr, err); 749 swim3_end_request_cur(-EIO); 750 fs->state = idle; 751 start_request(fs); 752 break; 753 } 754 if (swim3_end_request(0, fs->scount << 9)) { 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 } else 765 fs->state = idle; 766 } 767 if (fs->state == idle) 768 start_request(fs); 769 break; 770 default: 771 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state); 772 } 773 return IRQ_HANDLED; 774 } 775 776 /* 777 static void fd_dma_interrupt(int irq, void *dev_id) 778 { 779 } 780 */ 781 782 static int grab_drive(struct floppy_state *fs, enum swim_state state, 783 int interruptible) 784 { 785 unsigned long flags; 786 787 spin_lock_irqsave(&fs->lock, flags); 788 if (fs->state != idle) { 789 ++fs->wanted; 790 while (fs->state != available) { 791 if (interruptible && signal_pending(current)) { 792 --fs->wanted; 793 spin_unlock_irqrestore(&fs->lock, flags); 794 return -EINTR; 795 } 796 interruptible_sleep_on(&fs->wait); 797 } 798 --fs->wanted; 799 } 800 fs->state = state; 801 spin_unlock_irqrestore(&fs->lock, flags); 802 return 0; 803 } 804 805 static void release_drive(struct floppy_state *fs) 806 { 807 unsigned long flags; 808 809 spin_lock_irqsave(&fs->lock, flags); 810 fs->state = idle; 811 start_request(fs); 812 spin_unlock_irqrestore(&fs->lock, flags); 813 } 814 815 static int fd_eject(struct floppy_state *fs) 816 { 817 int err, n; 818 819 err = grab_drive(fs, ejecting, 1); 820 if (err) 821 return err; 822 swim3_action(fs, EJECT); 823 for (n = 20; n > 0; --n) { 824 if (signal_pending(current)) { 825 err = -EINTR; 826 break; 827 } 828 swim3_select(fs, RELAX); 829 schedule_timeout_interruptible(1); 830 if (swim3_readbit(fs, DISK_IN) == 0) 831 break; 832 } 833 swim3_select(fs, RELAX); 834 udelay(150); 835 fs->ejected = 1; 836 release_drive(fs); 837 return err; 838 } 839 840 static struct floppy_struct floppy_type = 841 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */ 842 843 static int floppy_locked_ioctl(struct block_device *bdev, fmode_t mode, 844 unsigned int cmd, unsigned long param) 845 { 846 struct floppy_state *fs = bdev->bd_disk->private_data; 847 int err; 848 849 if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)) 850 return -EPERM; 851 852 if (fs->mdev->media_bay && 853 check_media_bay(fs->mdev->media_bay) != MB_FD) 854 return -ENXIO; 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_ioctl(struct block_device *bdev, fmode_t mode, 872 unsigned int cmd, unsigned long param) 873 { 874 int ret; 875 876 lock_kernel(); 877 ret = floppy_locked_ioctl(bdev, mode, cmd, param); 878 unlock_kernel(); 879 880 return ret; 881 } 882 883 static int floppy_open(struct block_device *bdev, fmode_t mode) 884 { 885 struct floppy_state *fs = bdev->bd_disk->private_data; 886 struct swim3 __iomem *sw = fs->swim3; 887 int n, err = 0; 888 889 if (fs->ref_count == 0) { 890 if (fs->mdev->media_bay && 891 check_media_bay(fs->mdev->media_bay) != MB_FD) 892 return -ENXIO; 893 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2); 894 out_8(&sw->control_bic, 0xff); 895 out_8(&sw->mode, 0x95); 896 udelay(10); 897 out_8(&sw->intr_enable, 0); 898 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE); 899 swim3_action(fs, MOTOR_ON); 900 fs->write_prot = -1; 901 fs->cur_cyl = -1; 902 for (n = 0; n < 2 * HZ; ++n) { 903 if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE)) 904 break; 905 if (signal_pending(current)) { 906 err = -EINTR; 907 break; 908 } 909 swim3_select(fs, RELAX); 910 schedule_timeout_interruptible(1); 911 } 912 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0 913 || swim3_readbit(fs, DISK_IN) == 0)) 914 err = -ENXIO; 915 swim3_action(fs, SETMFM); 916 swim3_select(fs, RELAX); 917 918 } else if (fs->ref_count == -1 || mode & FMODE_EXCL) 919 return -EBUSY; 920 921 if (err == 0 && (mode & FMODE_NDELAY) == 0 922 && (mode & (FMODE_READ|FMODE_WRITE))) { 923 check_disk_change(bdev); 924 if (fs->ejected) 925 err = -ENXIO; 926 } 927 928 if (err == 0 && (mode & FMODE_WRITE)) { 929 if (fs->write_prot < 0) 930 fs->write_prot = swim3_readbit(fs, WRITE_PROT); 931 if (fs->write_prot) 932 err = -EROFS; 933 } 934 935 if (err) { 936 if (fs->ref_count == 0) { 937 swim3_action(fs, MOTOR_OFF); 938 out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE); 939 swim3_select(fs, RELAX); 940 } 941 return err; 942 } 943 944 if (mode & FMODE_EXCL) 945 fs->ref_count = -1; 946 else 947 ++fs->ref_count; 948 949 return 0; 950 } 951 952 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode) 953 { 954 int ret; 955 956 lock_kernel(); 957 ret = floppy_open(bdev, mode); 958 unlock_kernel(); 959 960 return ret; 961 } 962 963 static int floppy_release(struct gendisk *disk, fmode_t mode) 964 { 965 struct floppy_state *fs = disk->private_data; 966 struct swim3 __iomem *sw = fs->swim3; 967 lock_kernel(); 968 if (fs->ref_count > 0 && --fs->ref_count == 0) { 969 swim3_action(fs, MOTOR_OFF); 970 out_8(&sw->control_bic, 0xff); 971 swim3_select(fs, RELAX); 972 } 973 unlock_kernel(); 974 return 0; 975 } 976 977 static int floppy_check_change(struct gendisk *disk) 978 { 979 struct floppy_state *fs = disk->private_data; 980 return fs->ejected; 981 } 982 983 static int floppy_revalidate(struct gendisk *disk) 984 { 985 struct floppy_state *fs = disk->private_data; 986 struct swim3 __iomem *sw; 987 int ret, n; 988 989 if (fs->mdev->media_bay && 990 check_media_bay(fs->mdev->media_bay) != MB_FD) 991 return -ENXIO; 992 993 sw = fs->swim3; 994 grab_drive(fs, revalidating, 0); 995 out_8(&sw->intr_enable, 0); 996 out_8(&sw->control_bis, DRIVE_ENABLE); 997 swim3_action(fs, MOTOR_ON); /* necessary? */ 998 fs->write_prot = -1; 999 fs->cur_cyl = -1; 1000 mdelay(1); 1001 for (n = HZ; n > 0; --n) { 1002 if (swim3_readbit(fs, SEEK_COMPLETE)) 1003 break; 1004 if (signal_pending(current)) 1005 break; 1006 swim3_select(fs, RELAX); 1007 schedule_timeout_interruptible(1); 1008 } 1009 ret = swim3_readbit(fs, SEEK_COMPLETE) == 0 1010 || swim3_readbit(fs, DISK_IN) == 0; 1011 if (ret) 1012 swim3_action(fs, MOTOR_OFF); 1013 else { 1014 fs->ejected = 0; 1015 swim3_action(fs, SETMFM); 1016 } 1017 swim3_select(fs, RELAX); 1018 1019 release_drive(fs); 1020 return ret; 1021 } 1022 1023 static const struct block_device_operations floppy_fops = { 1024 .open = floppy_unlocked_open, 1025 .release = floppy_release, 1026 .ioctl = floppy_ioctl, 1027 .media_changed = floppy_check_change, 1028 .revalidate_disk= floppy_revalidate, 1029 }; 1030 1031 static int swim3_add_device(struct macio_dev *mdev, int index) 1032 { 1033 struct device_node *swim = mdev->ofdev.dev.of_node; 1034 struct floppy_state *fs = &floppy_states[index]; 1035 int rc = -EBUSY; 1036 1037 /* Check & Request resources */ 1038 if (macio_resource_count(mdev) < 2) { 1039 printk(KERN_WARNING "ifd%d: no address for %s\n", 1040 index, swim->full_name); 1041 return -ENXIO; 1042 } 1043 if (macio_irq_count(mdev) < 2) { 1044 printk(KERN_WARNING "fd%d: no intrs for device %s\n", 1045 index, swim->full_name); 1046 } 1047 if (macio_request_resource(mdev, 0, "swim3 (mmio)")) { 1048 printk(KERN_ERR "fd%d: can't request mmio resource for %s\n", 1049 index, swim->full_name); 1050 return -EBUSY; 1051 } 1052 if (macio_request_resource(mdev, 1, "swim3 (dma)")) { 1053 printk(KERN_ERR "fd%d: can't request dma resource for %s\n", 1054 index, swim->full_name); 1055 macio_release_resource(mdev, 0); 1056 return -EBUSY; 1057 } 1058 dev_set_drvdata(&mdev->ofdev.dev, fs); 1059 1060 if (mdev->media_bay == NULL) 1061 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1); 1062 1063 memset(fs, 0, sizeof(*fs)); 1064 spin_lock_init(&fs->lock); 1065 fs->state = idle; 1066 fs->swim3 = (struct swim3 __iomem *) 1067 ioremap(macio_resource_start(mdev, 0), 0x200); 1068 if (fs->swim3 == NULL) { 1069 printk("fd%d: couldn't map registers for %s\n", 1070 index, swim->full_name); 1071 rc = -ENOMEM; 1072 goto out_release; 1073 } 1074 fs->dma = (struct dbdma_regs __iomem *) 1075 ioremap(macio_resource_start(mdev, 1), 0x200); 1076 if (fs->dma == NULL) { 1077 printk("fd%d: couldn't map DMA for %s\n", 1078 index, swim->full_name); 1079 iounmap(fs->swim3); 1080 rc = -ENOMEM; 1081 goto out_release; 1082 } 1083 fs->swim3_intr = macio_irq(mdev, 0); 1084 fs->dma_intr = macio_irq(mdev, 1); 1085 fs->cur_cyl = -1; 1086 fs->cur_sector = -1; 1087 fs->secpercyl = 36; 1088 fs->secpertrack = 18; 1089 fs->total_secs = 2880; 1090 fs->mdev = mdev; 1091 init_waitqueue_head(&fs->wait); 1092 1093 fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space); 1094 memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd)); 1095 st_le16(&fs->dma_cmd[1].command, DBDMA_STOP); 1096 1097 if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) { 1098 printk(KERN_ERR "fd%d: couldn't request irq %d for %s\n", 1099 index, fs->swim3_intr, swim->full_name); 1100 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0); 1101 goto out_unmap; 1102 return -EBUSY; 1103 } 1104 /* 1105 if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) { 1106 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA", 1107 fs->dma_intr); 1108 return -EBUSY; 1109 } 1110 */ 1111 1112 init_timer(&fs->timeout); 1113 1114 printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count, 1115 mdev->media_bay ? "in media bay" : ""); 1116 1117 return 0; 1118 1119 out_unmap: 1120 iounmap(fs->dma); 1121 iounmap(fs->swim3); 1122 1123 out_release: 1124 macio_release_resource(mdev, 0); 1125 macio_release_resource(mdev, 1); 1126 1127 return rc; 1128 } 1129 1130 static int __devinit swim3_attach(struct macio_dev *mdev, const struct of_device_id *match) 1131 { 1132 int i, rc; 1133 struct gendisk *disk; 1134 1135 /* Add the drive */ 1136 rc = swim3_add_device(mdev, floppy_count); 1137 if (rc) 1138 return rc; 1139 1140 /* Now create the queue if not there yet */ 1141 if (swim3_queue == NULL) { 1142 /* If we failed, there isn't much we can do as the driver is still 1143 * too dumb to remove the device, just bail out 1144 */ 1145 if (register_blkdev(FLOPPY_MAJOR, "fd")) 1146 return 0; 1147 swim3_queue = blk_init_queue(do_fd_request, &swim3_lock); 1148 if (swim3_queue == NULL) { 1149 unregister_blkdev(FLOPPY_MAJOR, "fd"); 1150 return 0; 1151 } 1152 } 1153 1154 /* Now register that disk. Same comment about failure handling */ 1155 i = floppy_count++; 1156 disk = disks[i] = alloc_disk(1); 1157 if (disk == NULL) 1158 return 0; 1159 1160 disk->major = FLOPPY_MAJOR; 1161 disk->first_minor = i; 1162 disk->fops = &floppy_fops; 1163 disk->private_data = &floppy_states[i]; 1164 disk->queue = swim3_queue; 1165 disk->flags |= GENHD_FL_REMOVABLE; 1166 sprintf(disk->disk_name, "fd%d", i); 1167 set_capacity(disk, 2880); 1168 add_disk(disk); 1169 1170 return 0; 1171 } 1172 1173 static struct of_device_id swim3_match[] = 1174 { 1175 { 1176 .name = "swim3", 1177 }, 1178 { 1179 .compatible = "ohare-swim3" 1180 }, 1181 { 1182 .compatible = "swim3" 1183 }, 1184 }; 1185 1186 static struct macio_driver swim3_driver = 1187 { 1188 .driver = { 1189 .name = "swim3", 1190 .of_match_table = swim3_match, 1191 }, 1192 .probe = swim3_attach, 1193 #if 0 1194 .suspend = swim3_suspend, 1195 .resume = swim3_resume, 1196 #endif 1197 }; 1198 1199 1200 int swim3_init(void) 1201 { 1202 macio_register_driver(&swim3_driver); 1203 return 0; 1204 } 1205 1206 module_init(swim3_init) 1207 1208 MODULE_LICENSE("GPL"); 1209 MODULE_AUTHOR("Paul Mackerras"); 1210 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR); 1211