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 inode *inode, struct file *filp, 248 unsigned int cmd, unsigned long param); 249 static int floppy_open(struct inode *inode, struct file *filp); 250 static int floppy_release(struct inode *inode, struct file *filp); 251 static int floppy_check_change(struct gendisk *disk); 252 static int floppy_revalidate(struct gendisk *disk); 253 254 #ifndef CONFIG_PMAC_MEDIABAY 255 #define check_media_bay(which, what) 1 256 #endif 257 258 static void swim3_select(struct floppy_state *fs, int sel) 259 { 260 struct swim3 __iomem *sw = fs->swim3; 261 262 out_8(&sw->select, RELAX); 263 if (sel & 8) 264 out_8(&sw->control_bis, SELECT); 265 else 266 out_8(&sw->control_bic, SELECT); 267 out_8(&sw->select, sel & CA_MASK); 268 } 269 270 static void swim3_action(struct floppy_state *fs, int action) 271 { 272 struct swim3 __iomem *sw = fs->swim3; 273 274 swim3_select(fs, action); 275 udelay(1); 276 out_8(&sw->select, sw->select | LSTRB); 277 udelay(2); 278 out_8(&sw->select, sw->select & ~LSTRB); 279 udelay(1); 280 } 281 282 static int swim3_readbit(struct floppy_state *fs, int bit) 283 { 284 struct swim3 __iomem *sw = fs->swim3; 285 int stat; 286 287 swim3_select(fs, bit); 288 udelay(1); 289 stat = in_8(&sw->status); 290 return (stat & DATA) == 0; 291 } 292 293 static void do_fd_request(struct request_queue * q) 294 { 295 int i; 296 for(i=0;i<floppy_count;i++) 297 { 298 #ifdef CONFIG_PMAC_MEDIABAY 299 if (floppy_states[i].media_bay && 300 check_media_bay(floppy_states[i].media_bay, MB_FD)) 301 continue; 302 #endif /* CONFIG_PMAC_MEDIABAY */ 303 start_request(&floppy_states[i]); 304 } 305 } 306 307 static void start_request(struct floppy_state *fs) 308 { 309 struct request *req; 310 unsigned long x; 311 312 if (fs->state == idle && fs->wanted) { 313 fs->state = available; 314 wake_up(&fs->wait); 315 return; 316 } 317 while (fs->state == idle && (req = elv_next_request(swim3_queue))) { 318 #if 0 319 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%ld buf=%p\n", 320 req->rq_disk->disk_name, req->cmd, 321 (long)req->sector, req->nr_sectors, req->buffer); 322 printk(" errors=%d current_nr_sectors=%ld\n", 323 req->errors, req->current_nr_sectors); 324 #endif 325 326 if (req->sector < 0 || req->sector >= fs->total_secs) { 327 end_request(req, 0); 328 continue; 329 } 330 if (req->current_nr_sectors == 0) { 331 end_request(req, 1); 332 continue; 333 } 334 if (fs->ejected) { 335 end_request(req, 0); 336 continue; 337 } 338 339 if (rq_data_dir(req) == WRITE) { 340 if (fs->write_prot < 0) 341 fs->write_prot = swim3_readbit(fs, WRITE_PROT); 342 if (fs->write_prot) { 343 end_request(req, 0); 344 continue; 345 } 346 } 347 348 /* Do not remove the cast. req->sector is now a sector_t and 349 * can be 64 bits, but it will never go past 32 bits for this 350 * driver anyway, so we can safely cast it down and not have 351 * to do a 64/32 division 352 */ 353 fs->req_cyl = ((long)req->sector) / fs->secpercyl; 354 x = ((long)req->sector) % fs->secpercyl; 355 fs->head = x / fs->secpertrack; 356 fs->req_sector = x % fs->secpertrack + 1; 357 fd_req = req; 358 fs->state = do_transfer; 359 fs->retries = 0; 360 361 act(fs); 362 } 363 } 364 365 static void set_timeout(struct floppy_state *fs, int nticks, 366 void (*proc)(unsigned long)) 367 { 368 unsigned long flags; 369 370 spin_lock_irqsave(&fs->lock, flags); 371 if (fs->timeout_pending) 372 del_timer(&fs->timeout); 373 fs->timeout.expires = jiffies + nticks; 374 fs->timeout.function = proc; 375 fs->timeout.data = (unsigned long) fs; 376 add_timer(&fs->timeout); 377 fs->timeout_pending = 1; 378 spin_unlock_irqrestore(&fs->lock, flags); 379 } 380 381 static inline void scan_track(struct floppy_state *fs) 382 { 383 struct swim3 __iomem *sw = fs->swim3; 384 385 swim3_select(fs, READ_DATA_0); 386 in_8(&sw->intr); /* clear SEEN_SECTOR bit */ 387 in_8(&sw->error); 388 out_8(&sw->intr_enable, SEEN_SECTOR); 389 out_8(&sw->control_bis, DO_ACTION); 390 /* enable intr when track found */ 391 set_timeout(fs, HZ, scan_timeout); /* enable timeout */ 392 } 393 394 static inline void seek_track(struct floppy_state *fs, int n) 395 { 396 struct swim3 __iomem *sw = fs->swim3; 397 398 if (n >= 0) { 399 swim3_action(fs, SEEK_POSITIVE); 400 sw->nseek = n; 401 } else { 402 swim3_action(fs, SEEK_NEGATIVE); 403 sw->nseek = -n; 404 } 405 fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1; 406 swim3_select(fs, STEP); 407 in_8(&sw->error); 408 /* enable intr when seek finished */ 409 out_8(&sw->intr_enable, SEEK_DONE); 410 out_8(&sw->control_bis, DO_SEEK); 411 set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */ 412 fs->settle_time = 0; 413 } 414 415 static inline void init_dma(struct dbdma_cmd *cp, int cmd, 416 void *buf, int count) 417 { 418 st_le16(&cp->req_count, count); 419 st_le16(&cp->command, cmd); 420 st_le32(&cp->phy_addr, virt_to_bus(buf)); 421 cp->xfer_status = 0; 422 } 423 424 static inline void setup_transfer(struct floppy_state *fs) 425 { 426 int n; 427 struct swim3 __iomem *sw = fs->swim3; 428 struct dbdma_cmd *cp = fs->dma_cmd; 429 struct dbdma_regs __iomem *dr = fs->dma; 430 431 if (fd_req->current_nr_sectors <= 0) { 432 printk(KERN_ERR "swim3: transfer 0 sectors?\n"); 433 return; 434 } 435 if (rq_data_dir(fd_req) == WRITE) 436 n = 1; 437 else { 438 n = fs->secpertrack - fs->req_sector + 1; 439 if (n > fd_req->current_nr_sectors) 440 n = fd_req->current_nr_sectors; 441 } 442 fs->scount = n; 443 swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0); 444 out_8(&sw->sector, fs->req_sector); 445 out_8(&sw->nsect, n); 446 out_8(&sw->gap3, 0); 447 out_le32(&dr->cmdptr, virt_to_bus(cp)); 448 if (rq_data_dir(fd_req) == WRITE) { 449 /* Set up 3 dma commands: write preamble, data, postamble */ 450 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble)); 451 ++cp; 452 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512); 453 ++cp; 454 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble)); 455 } else { 456 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512); 457 } 458 ++cp; 459 out_le16(&cp->command, DBDMA_STOP); 460 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 461 in_8(&sw->error); 462 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 463 if (rq_data_dir(fd_req) == WRITE) 464 out_8(&sw->control_bis, WRITE_SECTORS); 465 in_8(&sw->intr); 466 out_le32(&dr->control, (RUN << 16) | RUN); 467 /* enable intr when transfer complete */ 468 out_8(&sw->intr_enable, TRANSFER_DONE); 469 out_8(&sw->control_bis, DO_ACTION); 470 set_timeout(fs, 2*HZ, xfer_timeout); /* enable timeout */ 471 } 472 473 static void act(struct floppy_state *fs) 474 { 475 for (;;) { 476 switch (fs->state) { 477 case idle: 478 return; /* XXX shouldn't get here */ 479 480 case locating: 481 if (swim3_readbit(fs, TRACK_ZERO)) { 482 fs->cur_cyl = 0; 483 if (fs->req_cyl == 0) 484 fs->state = do_transfer; 485 else 486 fs->state = seeking; 487 break; 488 } 489 scan_track(fs); 490 return; 491 492 case seeking: 493 if (fs->cur_cyl < 0) { 494 fs->expect_cyl = -1; 495 fs->state = locating; 496 break; 497 } 498 if (fs->req_cyl == fs->cur_cyl) { 499 printk("whoops, seeking 0\n"); 500 fs->state = do_transfer; 501 break; 502 } 503 seek_track(fs, fs->req_cyl - fs->cur_cyl); 504 return; 505 506 case settling: 507 /* check for SEEK_COMPLETE after 30ms */ 508 fs->settle_time = (HZ + 32) / 33; 509 set_timeout(fs, fs->settle_time, settle_timeout); 510 return; 511 512 case do_transfer: 513 if (fs->cur_cyl != fs->req_cyl) { 514 if (fs->retries > 5) { 515 end_request(fd_req, 0); 516 fs->state = idle; 517 return; 518 } 519 fs->state = seeking; 520 break; 521 } 522 setup_transfer(fs); 523 return; 524 525 case jogging: 526 seek_track(fs, -5); 527 return; 528 529 default: 530 printk(KERN_ERR"swim3: unknown state %d\n", fs->state); 531 return; 532 } 533 } 534 } 535 536 static void scan_timeout(unsigned long data) 537 { 538 struct floppy_state *fs = (struct floppy_state *) data; 539 struct swim3 __iomem *sw = fs->swim3; 540 541 fs->timeout_pending = 0; 542 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 543 out_8(&sw->select, RELAX); 544 out_8(&sw->intr_enable, 0); 545 fs->cur_cyl = -1; 546 if (fs->retries > 5) { 547 end_request(fd_req, 0); 548 fs->state = idle; 549 start_request(fs); 550 } else { 551 fs->state = jogging; 552 act(fs); 553 } 554 } 555 556 static void seek_timeout(unsigned long data) 557 { 558 struct floppy_state *fs = (struct floppy_state *) data; 559 struct swim3 __iomem *sw = fs->swim3; 560 561 fs->timeout_pending = 0; 562 out_8(&sw->control_bic, DO_SEEK); 563 out_8(&sw->select, RELAX); 564 out_8(&sw->intr_enable, 0); 565 printk(KERN_ERR "swim3: seek timeout\n"); 566 end_request(fd_req, 0); 567 fs->state = idle; 568 start_request(fs); 569 } 570 571 static void settle_timeout(unsigned long data) 572 { 573 struct floppy_state *fs = (struct floppy_state *) data; 574 struct swim3 __iomem *sw = fs->swim3; 575 576 fs->timeout_pending = 0; 577 if (swim3_readbit(fs, SEEK_COMPLETE)) { 578 out_8(&sw->select, RELAX); 579 fs->state = locating; 580 act(fs); 581 return; 582 } 583 out_8(&sw->select, RELAX); 584 if (fs->settle_time < 2*HZ) { 585 ++fs->settle_time; 586 set_timeout(fs, 1, settle_timeout); 587 return; 588 } 589 printk(KERN_ERR "swim3: seek settle timeout\n"); 590 end_request(fd_req, 0); 591 fs->state = idle; 592 start_request(fs); 593 } 594 595 static void xfer_timeout(unsigned long data) 596 { 597 struct floppy_state *fs = (struct floppy_state *) data; 598 struct swim3 __iomem *sw = fs->swim3; 599 struct dbdma_regs __iomem *dr = fs->dma; 600 struct dbdma_cmd *cp = fs->dma_cmd; 601 unsigned long s; 602 int n; 603 604 fs->timeout_pending = 0; 605 out_le32(&dr->control, RUN << 16); 606 /* We must wait a bit for dbdma to stop */ 607 for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++) 608 udelay(1); 609 out_8(&sw->intr_enable, 0); 610 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); 611 out_8(&sw->select, RELAX); 612 if (rq_data_dir(fd_req) == WRITE) 613 ++cp; 614 if (ld_le16(&cp->xfer_status) != 0) 615 s = fs->scount - ((ld_le16(&cp->res_count) + 511) >> 9); 616 else 617 s = 0; 618 fd_req->sector += s; 619 fd_req->current_nr_sectors -= s; 620 printk(KERN_ERR "swim3: timeout %sing sector %ld\n", 621 (rq_data_dir(fd_req)==WRITE? "writ": "read"), (long)fd_req->sector); 622 end_request(fd_req, 0); 623 fs->state = idle; 624 start_request(fs); 625 } 626 627 static irqreturn_t swim3_interrupt(int irq, void *dev_id) 628 { 629 struct floppy_state *fs = (struct floppy_state *) dev_id; 630 struct swim3 __iomem *sw = fs->swim3; 631 int intr, err, n; 632 int stat, resid; 633 struct dbdma_regs __iomem *dr; 634 struct dbdma_cmd *cp; 635 636 intr = in_8(&sw->intr); 637 err = (intr & ERROR_INTR)? in_8(&sw->error): 0; 638 if ((intr & ERROR_INTR) && fs->state != do_transfer) 639 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%x, intr=%x, err=%x\n", 640 fs->state, rq_data_dir(fd_req), intr, err); 641 switch (fs->state) { 642 case locating: 643 if (intr & SEEN_SECTOR) { 644 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 645 out_8(&sw->select, RELAX); 646 out_8(&sw->intr_enable, 0); 647 del_timer(&fs->timeout); 648 fs->timeout_pending = 0; 649 if (sw->ctrack == 0xff) { 650 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n"); 651 fs->cur_cyl = -1; 652 if (fs->retries > 5) { 653 end_request(fd_req, 0); 654 fs->state = idle; 655 start_request(fs); 656 } else { 657 fs->state = jogging; 658 act(fs); 659 } 660 break; 661 } 662 fs->cur_cyl = sw->ctrack; 663 fs->cur_sector = sw->csect; 664 if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl) 665 printk(KERN_ERR "swim3: expected cyl %d, got %d\n", 666 fs->expect_cyl, fs->cur_cyl); 667 fs->state = do_transfer; 668 act(fs); 669 } 670 break; 671 case seeking: 672 case jogging: 673 if (sw->nseek == 0) { 674 out_8(&sw->control_bic, DO_SEEK); 675 out_8(&sw->select, RELAX); 676 out_8(&sw->intr_enable, 0); 677 del_timer(&fs->timeout); 678 fs->timeout_pending = 0; 679 if (fs->state == seeking) 680 ++fs->retries; 681 fs->state = settling; 682 act(fs); 683 } 684 break; 685 case settling: 686 out_8(&sw->intr_enable, 0); 687 del_timer(&fs->timeout); 688 fs->timeout_pending = 0; 689 act(fs); 690 break; 691 case do_transfer: 692 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0) 693 break; 694 out_8(&sw->intr_enable, 0); 695 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); 696 out_8(&sw->select, RELAX); 697 del_timer(&fs->timeout); 698 fs->timeout_pending = 0; 699 dr = fs->dma; 700 cp = fs->dma_cmd; 701 if (rq_data_dir(fd_req) == WRITE) 702 ++cp; 703 /* 704 * Check that the main data transfer has finished. 705 * On writing, the swim3 sometimes doesn't use 706 * up all the bytes of the postamble, so we can still 707 * see DMA active here. That doesn't matter as long 708 * as all the sector data has been transferred. 709 */ 710 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) { 711 /* wait a little while for DMA to complete */ 712 for (n = 0; n < 100; ++n) { 713 if (cp->xfer_status != 0) 714 break; 715 udelay(1); 716 barrier(); 717 } 718 } 719 /* turn off DMA */ 720 out_le32(&dr->control, (RUN | PAUSE) << 16); 721 stat = ld_le16(&cp->xfer_status); 722 resid = ld_le16(&cp->res_count); 723 if (intr & ERROR_INTR) { 724 n = fs->scount - 1 - resid / 512; 725 if (n > 0) { 726 fd_req->sector += n; 727 fd_req->current_nr_sectors -= n; 728 fd_req->buffer += n * 512; 729 fs->req_sector += n; 730 } 731 if (fs->retries < 5) { 732 ++fs->retries; 733 act(fs); 734 } else { 735 printk("swim3: error %sing block %ld (err=%x)\n", 736 rq_data_dir(fd_req) == WRITE? "writ": "read", 737 (long)fd_req->sector, err); 738 end_request(fd_req, 0); 739 fs->state = idle; 740 } 741 } else { 742 if ((stat & ACTIVE) == 0 || resid != 0) { 743 /* musta been an error */ 744 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid); 745 printk(KERN_ERR " state=%d, dir=%x, intr=%x, err=%x\n", 746 fs->state, rq_data_dir(fd_req), intr, err); 747 end_request(fd_req, 0); 748 fs->state = idle; 749 start_request(fs); 750 break; 751 } 752 fd_req->sector += fs->scount; 753 fd_req->current_nr_sectors -= fs->scount; 754 fd_req->buffer += fs->scount * 512; 755 if (fd_req->current_nr_sectors <= 0) { 756 end_request(fd_req, 1); 757 fs->state = idle; 758 } else { 759 fs->req_sector += fs->scount; 760 if (fs->req_sector > fs->secpertrack) { 761 fs->req_sector -= fs->secpertrack; 762 if (++fs->head > 1) { 763 fs->head = 0; 764 ++fs->req_cyl; 765 } 766 } 767 act(fs); 768 } 769 } 770 if (fs->state == idle) 771 start_request(fs); 772 break; 773 default: 774 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state); 775 } 776 return IRQ_HANDLED; 777 } 778 779 /* 780 static void fd_dma_interrupt(int irq, void *dev_id) 781 { 782 } 783 */ 784 785 static int grab_drive(struct floppy_state *fs, enum swim_state state, 786 int interruptible) 787 { 788 unsigned long flags; 789 790 spin_lock_irqsave(&fs->lock, flags); 791 if (fs->state != idle) { 792 ++fs->wanted; 793 while (fs->state != available) { 794 if (interruptible && signal_pending(current)) { 795 --fs->wanted; 796 spin_unlock_irqrestore(&fs->lock, flags); 797 return -EINTR; 798 } 799 interruptible_sleep_on(&fs->wait); 800 } 801 --fs->wanted; 802 } 803 fs->state = state; 804 spin_unlock_irqrestore(&fs->lock, flags); 805 return 0; 806 } 807 808 static void release_drive(struct floppy_state *fs) 809 { 810 unsigned long flags; 811 812 spin_lock_irqsave(&fs->lock, flags); 813 fs->state = idle; 814 start_request(fs); 815 spin_unlock_irqrestore(&fs->lock, flags); 816 } 817 818 static int fd_eject(struct floppy_state *fs) 819 { 820 int err, n; 821 822 err = grab_drive(fs, ejecting, 1); 823 if (err) 824 return err; 825 swim3_action(fs, EJECT); 826 for (n = 20; n > 0; --n) { 827 if (signal_pending(current)) { 828 err = -EINTR; 829 break; 830 } 831 swim3_select(fs, RELAX); 832 schedule_timeout_interruptible(1); 833 if (swim3_readbit(fs, DISK_IN) == 0) 834 break; 835 } 836 swim3_select(fs, RELAX); 837 udelay(150); 838 fs->ejected = 1; 839 release_drive(fs); 840 return err; 841 } 842 843 static struct floppy_struct floppy_type = 844 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */ 845 846 static int floppy_ioctl(struct inode *inode, struct file *filp, 847 unsigned int cmd, unsigned long param) 848 { 849 struct floppy_state *fs = inode->i_bdev->bd_disk->private_data; 850 int err; 851 852 if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)) 853 return -EPERM; 854 855 #ifdef CONFIG_PMAC_MEDIABAY 856 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD)) 857 return -ENXIO; 858 #endif 859 860 switch (cmd) { 861 case FDEJECT: 862 if (fs->ref_count != 1) 863 return -EBUSY; 864 err = fd_eject(fs); 865 return err; 866 case FDGETPRM: 867 if (copy_to_user((void __user *) param, &floppy_type, 868 sizeof(struct floppy_struct))) 869 return -EFAULT; 870 return 0; 871 } 872 return -ENOTTY; 873 } 874 875 static int floppy_open(struct inode *inode, struct file *filp) 876 { 877 struct floppy_state *fs = inode->i_bdev->bd_disk->private_data; 878 struct swim3 __iomem *sw = fs->swim3; 879 int n, err = 0; 880 881 if (fs->ref_count == 0) { 882 #ifdef CONFIG_PMAC_MEDIABAY 883 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD)) 884 return -ENXIO; 885 #endif 886 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2); 887 out_8(&sw->control_bic, 0xff); 888 out_8(&sw->mode, 0x95); 889 udelay(10); 890 out_8(&sw->intr_enable, 0); 891 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE); 892 swim3_action(fs, MOTOR_ON); 893 fs->write_prot = -1; 894 fs->cur_cyl = -1; 895 for (n = 0; n < 2 * HZ; ++n) { 896 if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE)) 897 break; 898 if (signal_pending(current)) { 899 err = -EINTR; 900 break; 901 } 902 swim3_select(fs, RELAX); 903 schedule_timeout_interruptible(1); 904 } 905 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0 906 || swim3_readbit(fs, DISK_IN) == 0)) 907 err = -ENXIO; 908 swim3_action(fs, SETMFM); 909 swim3_select(fs, RELAX); 910 911 } else if (fs->ref_count == -1 || filp->f_flags & O_EXCL) 912 return -EBUSY; 913 914 if (err == 0 && (filp->f_flags & O_NDELAY) == 0 915 && (filp->f_mode & 3)) { 916 check_disk_change(inode->i_bdev); 917 if (fs->ejected) 918 err = -ENXIO; 919 } 920 921 if (err == 0 && (filp->f_mode & 2)) { 922 if (fs->write_prot < 0) 923 fs->write_prot = swim3_readbit(fs, WRITE_PROT); 924 if (fs->write_prot) 925 err = -EROFS; 926 } 927 928 if (err) { 929 if (fs->ref_count == 0) { 930 swim3_action(fs, MOTOR_OFF); 931 out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE); 932 swim3_select(fs, RELAX); 933 } 934 return err; 935 } 936 937 if (filp->f_flags & O_EXCL) 938 fs->ref_count = -1; 939 else 940 ++fs->ref_count; 941 942 return 0; 943 } 944 945 static int floppy_release(struct inode *inode, struct file *filp) 946 { 947 struct floppy_state *fs = inode->i_bdev->bd_disk->private_data; 948 struct swim3 __iomem *sw = fs->swim3; 949 if (fs->ref_count > 0 && --fs->ref_count == 0) { 950 swim3_action(fs, MOTOR_OFF); 951 out_8(&sw->control_bic, 0xff); 952 swim3_select(fs, RELAX); 953 } 954 return 0; 955 } 956 957 static int floppy_check_change(struct gendisk *disk) 958 { 959 struct floppy_state *fs = disk->private_data; 960 return fs->ejected; 961 } 962 963 static int floppy_revalidate(struct gendisk *disk) 964 { 965 struct floppy_state *fs = disk->private_data; 966 struct swim3 __iomem *sw; 967 int ret, n; 968 969 #ifdef CONFIG_PMAC_MEDIABAY 970 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD)) 971 return -ENXIO; 972 #endif 973 974 sw = fs->swim3; 975 grab_drive(fs, revalidating, 0); 976 out_8(&sw->intr_enable, 0); 977 out_8(&sw->control_bis, DRIVE_ENABLE); 978 swim3_action(fs, MOTOR_ON); /* necessary? */ 979 fs->write_prot = -1; 980 fs->cur_cyl = -1; 981 mdelay(1); 982 for (n = HZ; n > 0; --n) { 983 if (swim3_readbit(fs, SEEK_COMPLETE)) 984 break; 985 if (signal_pending(current)) 986 break; 987 swim3_select(fs, RELAX); 988 schedule_timeout_interruptible(1); 989 } 990 ret = swim3_readbit(fs, SEEK_COMPLETE) == 0 991 || swim3_readbit(fs, DISK_IN) == 0; 992 if (ret) 993 swim3_action(fs, MOTOR_OFF); 994 else { 995 fs->ejected = 0; 996 swim3_action(fs, SETMFM); 997 } 998 swim3_select(fs, RELAX); 999 1000 release_drive(fs); 1001 return ret; 1002 } 1003 1004 static struct block_device_operations floppy_fops = { 1005 .open = floppy_open, 1006 .release = floppy_release, 1007 .ioctl = floppy_ioctl, 1008 .media_changed = floppy_check_change, 1009 .revalidate_disk= floppy_revalidate, 1010 }; 1011 1012 static int swim3_add_device(struct macio_dev *mdev, int index) 1013 { 1014 struct device_node *swim = mdev->ofdev.node; 1015 struct device_node *mediabay; 1016 struct floppy_state *fs = &floppy_states[index]; 1017 int rc = -EBUSY; 1018 1019 /* Check & Request resources */ 1020 if (macio_resource_count(mdev) < 2) { 1021 printk(KERN_WARNING "ifd%d: no address for %s\n", 1022 index, swim->full_name); 1023 return -ENXIO; 1024 } 1025 if (macio_irq_count(mdev) < 2) { 1026 printk(KERN_WARNING "fd%d: no intrs for device %s\n", 1027 index, swim->full_name); 1028 } 1029 if (macio_request_resource(mdev, 0, "swim3 (mmio)")) { 1030 printk(KERN_ERR "fd%d: can't request mmio resource for %s\n", 1031 index, swim->full_name); 1032 return -EBUSY; 1033 } 1034 if (macio_request_resource(mdev, 1, "swim3 (dma)")) { 1035 printk(KERN_ERR "fd%d: can't request dma resource for %s\n", 1036 index, swim->full_name); 1037 macio_release_resource(mdev, 0); 1038 return -EBUSY; 1039 } 1040 dev_set_drvdata(&mdev->ofdev.dev, fs); 1041 1042 mediabay = (strcasecmp(swim->parent->type, "media-bay") == 0) ? 1043 swim->parent : NULL; 1044 if (mediabay == NULL) 1045 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1); 1046 1047 memset(fs, 0, sizeof(*fs)); 1048 spin_lock_init(&fs->lock); 1049 fs->state = idle; 1050 fs->swim3 = (struct swim3 __iomem *) 1051 ioremap(macio_resource_start(mdev, 0), 0x200); 1052 if (fs->swim3 == NULL) { 1053 printk("fd%d: couldn't map registers for %s\n", 1054 index, swim->full_name); 1055 rc = -ENOMEM; 1056 goto out_release; 1057 } 1058 fs->dma = (struct dbdma_regs __iomem *) 1059 ioremap(macio_resource_start(mdev, 1), 0x200); 1060 if (fs->dma == NULL) { 1061 printk("fd%d: couldn't map DMA for %s\n", 1062 index, swim->full_name); 1063 iounmap(fs->swim3); 1064 rc = -ENOMEM; 1065 goto out_release; 1066 } 1067 fs->swim3_intr = macio_irq(mdev, 0); 1068 fs->dma_intr = macio_irq(mdev, 1);; 1069 fs->cur_cyl = -1; 1070 fs->cur_sector = -1; 1071 fs->secpercyl = 36; 1072 fs->secpertrack = 18; 1073 fs->total_secs = 2880; 1074 fs->media_bay = mediabay; 1075 init_waitqueue_head(&fs->wait); 1076 1077 fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space); 1078 memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd)); 1079 st_le16(&fs->dma_cmd[1].command, DBDMA_STOP); 1080 1081 if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) { 1082 printk(KERN_ERR "fd%d: couldn't request irq %d for %s\n", 1083 index, fs->swim3_intr, swim->full_name); 1084 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0); 1085 goto out_unmap; 1086 return -EBUSY; 1087 } 1088 /* 1089 if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) { 1090 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA", 1091 fs->dma_intr); 1092 return -EBUSY; 1093 } 1094 */ 1095 1096 init_timer(&fs->timeout); 1097 1098 printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count, 1099 mediabay ? "in media bay" : ""); 1100 1101 return 0; 1102 1103 out_unmap: 1104 iounmap(fs->dma); 1105 iounmap(fs->swim3); 1106 1107 out_release: 1108 macio_release_resource(mdev, 0); 1109 macio_release_resource(mdev, 1); 1110 1111 return rc; 1112 } 1113 1114 static int __devinit swim3_attach(struct macio_dev *mdev, const struct of_device_id *match) 1115 { 1116 int i, rc; 1117 struct gendisk *disk; 1118 1119 /* Add the drive */ 1120 rc = swim3_add_device(mdev, floppy_count); 1121 if (rc) 1122 return rc; 1123 1124 /* Now create the queue if not there yet */ 1125 if (swim3_queue == NULL) { 1126 /* If we failed, there isn't much we can do as the driver is still 1127 * too dumb to remove the device, just bail out 1128 */ 1129 if (register_blkdev(FLOPPY_MAJOR, "fd")) 1130 return 0; 1131 swim3_queue = blk_init_queue(do_fd_request, &swim3_lock); 1132 if (swim3_queue == NULL) { 1133 unregister_blkdev(FLOPPY_MAJOR, "fd"); 1134 return 0; 1135 } 1136 } 1137 1138 /* Now register that disk. Same comment about failure handling */ 1139 i = floppy_count++; 1140 disk = disks[i] = alloc_disk(1); 1141 if (disk == NULL) 1142 return 0; 1143 1144 disk->major = FLOPPY_MAJOR; 1145 disk->first_minor = i; 1146 disk->fops = &floppy_fops; 1147 disk->private_data = &floppy_states[i]; 1148 disk->queue = swim3_queue; 1149 disk->flags |= GENHD_FL_REMOVABLE; 1150 sprintf(disk->disk_name, "fd%d", i); 1151 set_capacity(disk, 2880); 1152 add_disk(disk); 1153 1154 return 0; 1155 } 1156 1157 static struct of_device_id swim3_match[] = 1158 { 1159 { 1160 .name = "swim3", 1161 }, 1162 { 1163 .compatible = "ohare-swim3" 1164 }, 1165 { 1166 .compatible = "swim3" 1167 }, 1168 }; 1169 1170 static struct macio_driver swim3_driver = 1171 { 1172 .name = "swim3", 1173 .match_table = swim3_match, 1174 .probe = swim3_attach, 1175 #if 0 1176 .suspend = swim3_suspend, 1177 .resume = swim3_resume, 1178 #endif 1179 }; 1180 1181 1182 int swim3_init(void) 1183 { 1184 macio_register_driver(&swim3_driver); 1185 return 0; 1186 } 1187 1188 module_init(swim3_init) 1189 1190 MODULE_LICENSE("GPL"); 1191 MODULE_AUTHOR("Paul Mackerras"); 1192 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR); 1193