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/config.h> 20 #include <linux/stddef.h> 21 #include <linux/kernel.h> 22 #include <linux/sched.h> 23 #include <linux/timer.h> 24 #include <linux/delay.h> 25 #include <linux/fd.h> 26 #include <linux/ioctl.h> 27 #include <linux/blkdev.h> 28 #include <linux/devfs_fs_kernel.h> 29 #include <linux/interrupt.h> 30 #include <linux/module.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 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(request_queue_t * 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, struct pt_regs *regs); 242 /*static void fd_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs);*/ 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 static int swim3_add_device(struct device_node *swims); 254 int swim3_init(void); 255 256 #ifndef CONFIG_PMAC_PBOOK 257 #define check_media_bay(which, what) 1 258 #endif 259 260 static void swim3_select(struct floppy_state *fs, int sel) 261 { 262 struct swim3 __iomem *sw = fs->swim3; 263 264 out_8(&sw->select, RELAX); 265 if (sel & 8) 266 out_8(&sw->control_bis, SELECT); 267 else 268 out_8(&sw->control_bic, SELECT); 269 out_8(&sw->select, sel & CA_MASK); 270 } 271 272 static void swim3_action(struct floppy_state *fs, int action) 273 { 274 struct swim3 __iomem *sw = fs->swim3; 275 276 swim3_select(fs, action); 277 udelay(1); 278 out_8(&sw->select, sw->select | LSTRB); 279 udelay(2); 280 out_8(&sw->select, sw->select & ~LSTRB); 281 udelay(1); 282 } 283 284 static int swim3_readbit(struct floppy_state *fs, int bit) 285 { 286 struct swim3 __iomem *sw = fs->swim3; 287 int stat; 288 289 swim3_select(fs, bit); 290 udelay(1); 291 stat = in_8(&sw->status); 292 return (stat & DATA) == 0; 293 } 294 295 static void do_fd_request(request_queue_t * q) 296 { 297 int i; 298 for(i=0;i<floppy_count;i++) 299 { 300 if (floppy_states[i].media_bay && 301 check_media_bay(floppy_states[i].media_bay, MB_FD)) 302 continue; 303 start_request(&floppy_states[i]); 304 } 305 sti(); 306 } 307 308 static void start_request(struct floppy_state *fs) 309 { 310 struct request *req; 311 unsigned long x; 312 313 if (fs->state == idle && fs->wanted) { 314 fs->state = available; 315 wake_up(&fs->wait); 316 return; 317 } 318 while (fs->state == idle && (req = elv_next_request(swim3_queue))) { 319 #if 0 320 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%ld buf=%p\n", 321 req->rq_disk->disk_name, req->cmd, 322 (long)req->sector, req->nr_sectors, req->buffer); 323 printk(" rq_status=%d errors=%d current_nr_sectors=%ld\n", 324 req->rq_status, req->errors, req->current_nr_sectors); 325 #endif 326 327 if (req->sector < 0 || req->sector >= fs->total_secs) { 328 end_request(req, 0); 329 continue; 330 } 331 if (req->current_nr_sectors == 0) { 332 end_request(req, 1); 333 continue; 334 } 335 if (fs->ejected) { 336 end_request(req, 0); 337 continue; 338 } 339 340 if (rq_data_dir(req) == WRITE) { 341 if (fs->write_prot < 0) 342 fs->write_prot = swim3_readbit(fs, WRITE_PROT); 343 if (fs->write_prot) { 344 end_request(req, 0); 345 continue; 346 } 347 } 348 349 /* Do not remove the cast. req->sector is now a sector_t and 350 * can be 64 bits, but it will never go past 32 bits for this 351 * driver anyway, so we can safely cast it down and not have 352 * to do a 64/32 division 353 */ 354 fs->req_cyl = ((long)req->sector) / fs->secpercyl; 355 x = ((long)req->sector) % fs->secpercyl; 356 fs->head = x / fs->secpertrack; 357 fs->req_sector = x % fs->secpertrack + 1; 358 fd_req = req; 359 fs->state = do_transfer; 360 fs->retries = 0; 361 362 act(fs); 363 } 364 } 365 366 static void set_timeout(struct floppy_state *fs, int nticks, 367 void (*proc)(unsigned long)) 368 { 369 unsigned long flags; 370 371 save_flags(flags); cli(); 372 if (fs->timeout_pending) 373 del_timer(&fs->timeout); 374 fs->timeout.expires = jiffies + nticks; 375 fs->timeout.function = proc; 376 fs->timeout.data = (unsigned long) fs; 377 add_timer(&fs->timeout); 378 fs->timeout_pending = 1; 379 restore_flags(flags); 380 } 381 382 static inline void scan_track(struct floppy_state *fs) 383 { 384 struct swim3 __iomem *sw = fs->swim3; 385 386 swim3_select(fs, READ_DATA_0); 387 in_8(&sw->intr); /* clear SEEN_SECTOR bit */ 388 in_8(&sw->error); 389 out_8(&sw->intr_enable, SEEN_SECTOR); 390 out_8(&sw->control_bis, DO_ACTION); 391 /* enable intr when track found */ 392 set_timeout(fs, HZ, scan_timeout); /* enable timeout */ 393 } 394 395 static inline void seek_track(struct floppy_state *fs, int n) 396 { 397 struct swim3 __iomem *sw = fs->swim3; 398 399 if (n >= 0) { 400 swim3_action(fs, SEEK_POSITIVE); 401 sw->nseek = n; 402 } else { 403 swim3_action(fs, SEEK_NEGATIVE); 404 sw->nseek = -n; 405 } 406 fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1; 407 swim3_select(fs, STEP); 408 in_8(&sw->error); 409 /* enable intr when seek finished */ 410 out_8(&sw->intr_enable, SEEK_DONE); 411 out_8(&sw->control_bis, DO_SEEK); 412 set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */ 413 fs->settle_time = 0; 414 } 415 416 static inline void init_dma(struct dbdma_cmd *cp, int cmd, 417 void *buf, int count) 418 { 419 st_le16(&cp->req_count, count); 420 st_le16(&cp->command, cmd); 421 st_le32(&cp->phy_addr, virt_to_bus(buf)); 422 cp->xfer_status = 0; 423 } 424 425 static inline void setup_transfer(struct floppy_state *fs) 426 { 427 int n; 428 struct swim3 __iomem *sw = fs->swim3; 429 struct dbdma_cmd *cp = fs->dma_cmd; 430 struct dbdma_regs __iomem *dr = fs->dma; 431 432 if (fd_req->current_nr_sectors <= 0) { 433 printk(KERN_ERR "swim3: transfer 0 sectors?\n"); 434 return; 435 } 436 if (rq_data_dir(fd_req) == WRITE) 437 n = 1; 438 else { 439 n = fs->secpertrack - fs->req_sector + 1; 440 if (n > fd_req->current_nr_sectors) 441 n = fd_req->current_nr_sectors; 442 } 443 fs->scount = n; 444 swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0); 445 out_8(&sw->sector, fs->req_sector); 446 out_8(&sw->nsect, n); 447 out_8(&sw->gap3, 0); 448 out_le32(&dr->cmdptr, virt_to_bus(cp)); 449 if (rq_data_dir(fd_req) == WRITE) { 450 /* Set up 3 dma commands: write preamble, data, postamble */ 451 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble)); 452 ++cp; 453 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512); 454 ++cp; 455 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble)); 456 } else { 457 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512); 458 } 459 ++cp; 460 out_le16(&cp->command, DBDMA_STOP); 461 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 462 in_8(&sw->error); 463 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 464 if (rq_data_dir(fd_req) == WRITE) 465 out_8(&sw->control_bis, WRITE_SECTORS); 466 in_8(&sw->intr); 467 out_le32(&dr->control, (RUN << 16) | RUN); 468 /* enable intr when transfer complete */ 469 out_8(&sw->intr_enable, TRANSFER_DONE); 470 out_8(&sw->control_bis, DO_ACTION); 471 set_timeout(fs, 2*HZ, xfer_timeout); /* enable timeout */ 472 } 473 474 static void act(struct floppy_state *fs) 475 { 476 for (;;) { 477 switch (fs->state) { 478 case idle: 479 return; /* XXX shouldn't get here */ 480 481 case locating: 482 if (swim3_readbit(fs, TRACK_ZERO)) { 483 fs->cur_cyl = 0; 484 if (fs->req_cyl == 0) 485 fs->state = do_transfer; 486 else 487 fs->state = seeking; 488 break; 489 } 490 scan_track(fs); 491 return; 492 493 case seeking: 494 if (fs->cur_cyl < 0) { 495 fs->expect_cyl = -1; 496 fs->state = locating; 497 break; 498 } 499 if (fs->req_cyl == fs->cur_cyl) { 500 printk("whoops, seeking 0\n"); 501 fs->state = do_transfer; 502 break; 503 } 504 seek_track(fs, fs->req_cyl - fs->cur_cyl); 505 return; 506 507 case settling: 508 /* check for SEEK_COMPLETE after 30ms */ 509 fs->settle_time = (HZ + 32) / 33; 510 set_timeout(fs, fs->settle_time, settle_timeout); 511 return; 512 513 case do_transfer: 514 if (fs->cur_cyl != fs->req_cyl) { 515 if (fs->retries > 5) { 516 end_request(fd_req, 0); 517 fs->state = idle; 518 return; 519 } 520 fs->state = seeking; 521 break; 522 } 523 setup_transfer(fs); 524 return; 525 526 case jogging: 527 seek_track(fs, -5); 528 return; 529 530 default: 531 printk(KERN_ERR"swim3: unknown state %d\n", fs->state); 532 return; 533 } 534 } 535 } 536 537 static void scan_timeout(unsigned long data) 538 { 539 struct floppy_state *fs = (struct floppy_state *) data; 540 struct swim3 __iomem *sw = fs->swim3; 541 542 fs->timeout_pending = 0; 543 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 544 out_8(&sw->select, RELAX); 545 out_8(&sw->intr_enable, 0); 546 fs->cur_cyl = -1; 547 if (fs->retries > 5) { 548 end_request(fd_req, 0); 549 fs->state = idle; 550 start_request(fs); 551 } else { 552 fs->state = jogging; 553 act(fs); 554 } 555 } 556 557 static void seek_timeout(unsigned long data) 558 { 559 struct floppy_state *fs = (struct floppy_state *) data; 560 struct swim3 __iomem *sw = fs->swim3; 561 562 fs->timeout_pending = 0; 563 out_8(&sw->control_bic, DO_SEEK); 564 out_8(&sw->select, RELAX); 565 out_8(&sw->intr_enable, 0); 566 printk(KERN_ERR "swim3: seek timeout\n"); 567 end_request(fd_req, 0); 568 fs->state = idle; 569 start_request(fs); 570 } 571 572 static void settle_timeout(unsigned long data) 573 { 574 struct floppy_state *fs = (struct floppy_state *) data; 575 struct swim3 __iomem *sw = fs->swim3; 576 577 fs->timeout_pending = 0; 578 if (swim3_readbit(fs, SEEK_COMPLETE)) { 579 out_8(&sw->select, RELAX); 580 fs->state = locating; 581 act(fs); 582 return; 583 } 584 out_8(&sw->select, RELAX); 585 if (fs->settle_time < 2*HZ) { 586 ++fs->settle_time; 587 set_timeout(fs, 1, settle_timeout); 588 return; 589 } 590 printk(KERN_ERR "swim3: seek settle timeout\n"); 591 end_request(fd_req, 0); 592 fs->state = idle; 593 start_request(fs); 594 } 595 596 static void xfer_timeout(unsigned long data) 597 { 598 struct floppy_state *fs = (struct floppy_state *) data; 599 struct swim3 __iomem *sw = fs->swim3; 600 struct dbdma_regs __iomem *dr = fs->dma; 601 struct dbdma_cmd *cp = fs->dma_cmd; 602 unsigned long s; 603 int n; 604 605 fs->timeout_pending = 0; 606 out_le32(&dr->control, RUN << 16); 607 /* We must wait a bit for dbdma to stop */ 608 for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++) 609 udelay(1); 610 out_8(&sw->intr_enable, 0); 611 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); 612 out_8(&sw->select, RELAX); 613 if (rq_data_dir(fd_req) == WRITE) 614 ++cp; 615 if (ld_le16(&cp->xfer_status) != 0) 616 s = fs->scount - ((ld_le16(&cp->res_count) + 511) >> 9); 617 else 618 s = 0; 619 fd_req->sector += s; 620 fd_req->current_nr_sectors -= s; 621 printk(KERN_ERR "swim3: timeout %sing sector %ld\n", 622 (rq_data_dir(fd_req)==WRITE? "writ": "read"), (long)fd_req->sector); 623 end_request(fd_req, 0); 624 fs->state = idle; 625 start_request(fs); 626 } 627 628 static irqreturn_t swim3_interrupt(int irq, void *dev_id, struct pt_regs *regs) 629 { 630 struct floppy_state *fs = (struct floppy_state *) dev_id; 631 struct swim3 __iomem *sw = fs->swim3; 632 int intr, err, n; 633 int stat, resid; 634 struct dbdma_regs __iomem *dr; 635 struct dbdma_cmd *cp; 636 637 intr = in_8(&sw->intr); 638 err = (intr & ERROR_INTR)? in_8(&sw->error): 0; 639 if ((intr & ERROR_INTR) && fs->state != do_transfer) 640 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%lx, intr=%x, err=%x\n", 641 fs->state, rq_data_dir(fd_req), intr, err); 642 switch (fs->state) { 643 case locating: 644 if (intr & SEEN_SECTOR) { 645 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); 646 out_8(&sw->select, RELAX); 647 out_8(&sw->intr_enable, 0); 648 del_timer(&fs->timeout); 649 fs->timeout_pending = 0; 650 if (sw->ctrack == 0xff) { 651 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n"); 652 fs->cur_cyl = -1; 653 if (fs->retries > 5) { 654 end_request(fd_req, 0); 655 fs->state = idle; 656 start_request(fs); 657 } else { 658 fs->state = jogging; 659 act(fs); 660 } 661 break; 662 } 663 fs->cur_cyl = sw->ctrack; 664 fs->cur_sector = sw->csect; 665 if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl) 666 printk(KERN_ERR "swim3: expected cyl %d, got %d\n", 667 fs->expect_cyl, fs->cur_cyl); 668 fs->state = do_transfer; 669 act(fs); 670 } 671 break; 672 case seeking: 673 case jogging: 674 if (sw->nseek == 0) { 675 out_8(&sw->control_bic, DO_SEEK); 676 out_8(&sw->select, RELAX); 677 out_8(&sw->intr_enable, 0); 678 del_timer(&fs->timeout); 679 fs->timeout_pending = 0; 680 if (fs->state == seeking) 681 ++fs->retries; 682 fs->state = settling; 683 act(fs); 684 } 685 break; 686 case settling: 687 out_8(&sw->intr_enable, 0); 688 del_timer(&fs->timeout); 689 fs->timeout_pending = 0; 690 act(fs); 691 break; 692 case do_transfer: 693 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0) 694 break; 695 out_8(&sw->intr_enable, 0); 696 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); 697 out_8(&sw->select, RELAX); 698 del_timer(&fs->timeout); 699 fs->timeout_pending = 0; 700 dr = fs->dma; 701 cp = fs->dma_cmd; 702 if (rq_data_dir(fd_req) == WRITE) 703 ++cp; 704 /* 705 * Check that the main data transfer has finished. 706 * On writing, the swim3 sometimes doesn't use 707 * up all the bytes of the postamble, so we can still 708 * see DMA active here. That doesn't matter as long 709 * as all the sector data has been transferred. 710 */ 711 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) { 712 /* wait a little while for DMA to complete */ 713 for (n = 0; n < 100; ++n) { 714 if (cp->xfer_status != 0) 715 break; 716 udelay(1); 717 barrier(); 718 } 719 } 720 /* turn off DMA */ 721 out_le32(&dr->control, (RUN | PAUSE) << 16); 722 stat = ld_le16(&cp->xfer_status); 723 resid = ld_le16(&cp->res_count); 724 if (intr & ERROR_INTR) { 725 n = fs->scount - 1 - resid / 512; 726 if (n > 0) { 727 fd_req->sector += n; 728 fd_req->current_nr_sectors -= n; 729 fd_req->buffer += n * 512; 730 fs->req_sector += n; 731 } 732 if (fs->retries < 5) { 733 ++fs->retries; 734 act(fs); 735 } else { 736 printk("swim3: error %sing block %ld (err=%x)\n", 737 rq_data_dir(fd_req) == WRITE? "writ": "read", 738 (long)fd_req->sector, err); 739 end_request(fd_req, 0); 740 fs->state = idle; 741 } 742 } else { 743 if ((stat & ACTIVE) == 0 || resid != 0) { 744 /* musta been an error */ 745 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid); 746 printk(KERN_ERR " state=%d, dir=%lx, intr=%x, err=%x\n", 747 fs->state, rq_data_dir(fd_req), intr, err); 748 end_request(fd_req, 0); 749 fs->state = idle; 750 start_request(fs); 751 break; 752 } 753 fd_req->sector += fs->scount; 754 fd_req->current_nr_sectors -= fs->scount; 755 fd_req->buffer += fs->scount * 512; 756 if (fd_req->current_nr_sectors <= 0) { 757 end_request(fd_req, 1); 758 fs->state = idle; 759 } else { 760 fs->req_sector += fs->scount; 761 if (fs->req_sector > fs->secpertrack) { 762 fs->req_sector -= fs->secpertrack; 763 if (++fs->head > 1) { 764 fs->head = 0; 765 ++fs->req_cyl; 766 } 767 } 768 act(fs); 769 } 770 } 771 if (fs->state == idle) 772 start_request(fs); 773 break; 774 default: 775 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state); 776 } 777 return IRQ_HANDLED; 778 } 779 780 /* 781 static void fd_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs) 782 { 783 } 784 */ 785 786 static int grab_drive(struct floppy_state *fs, enum swim_state state, 787 int interruptible) 788 { 789 unsigned long flags; 790 791 save_flags(flags); 792 cli(); 793 if (fs->state != idle) { 794 ++fs->wanted; 795 while (fs->state != available) { 796 if (interruptible && signal_pending(current)) { 797 --fs->wanted; 798 restore_flags(flags); 799 return -EINTR; 800 } 801 interruptible_sleep_on(&fs->wait); 802 } 803 --fs->wanted; 804 } 805 fs->state = state; 806 restore_flags(flags); 807 return 0; 808 } 809 810 static void release_drive(struct floppy_state *fs) 811 { 812 unsigned long flags; 813 814 save_flags(flags); 815 cli(); 816 fs->state = idle; 817 start_request(fs); 818 restore_flags(flags); 819 } 820 821 static int fd_eject(struct floppy_state *fs) 822 { 823 int err, n; 824 825 err = grab_drive(fs, ejecting, 1); 826 if (err) 827 return err; 828 swim3_action(fs, EJECT); 829 for (n = 20; n > 0; --n) { 830 if (signal_pending(current)) { 831 err = -EINTR; 832 break; 833 } 834 swim3_select(fs, RELAX); 835 current->state = TASK_INTERRUPTIBLE; 836 schedule_timeout(1); 837 if (swim3_readbit(fs, DISK_IN) == 0) 838 break; 839 } 840 swim3_select(fs, RELAX); 841 udelay(150); 842 fs->ejected = 1; 843 release_drive(fs); 844 return err; 845 } 846 847 static struct floppy_struct floppy_type = 848 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */ 849 850 static int floppy_ioctl(struct inode *inode, struct file *filp, 851 unsigned int cmd, unsigned long param) 852 { 853 struct floppy_state *fs = inode->i_bdev->bd_disk->private_data; 854 int err; 855 856 if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)) 857 return -EPERM; 858 859 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD)) 860 return -ENXIO; 861 862 switch (cmd) { 863 case FDEJECT: 864 if (fs->ref_count != 1) 865 return -EBUSY; 866 err = fd_eject(fs); 867 return err; 868 case FDGETPRM: 869 if (copy_to_user((void __user *) param, &floppy_type, 870 sizeof(struct floppy_struct))) 871 return -EFAULT; 872 return 0; 873 } 874 return -ENOTTY; 875 } 876 877 static int floppy_open(struct inode *inode, struct file *filp) 878 { 879 struct floppy_state *fs = inode->i_bdev->bd_disk->private_data; 880 struct swim3 __iomem *sw = fs->swim3; 881 int n, err = 0; 882 883 if (fs->ref_count == 0) { 884 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD)) 885 return -ENXIO; 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 current->state = TASK_INTERRUPTIBLE; 904 schedule_timeout(1); 905 } 906 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0 907 || swim3_readbit(fs, DISK_IN) == 0)) 908 err = -ENXIO; 909 swim3_action(fs, SETMFM); 910 swim3_select(fs, RELAX); 911 912 } else if (fs->ref_count == -1 || filp->f_flags & O_EXCL) 913 return -EBUSY; 914 915 if (err == 0 && (filp->f_flags & O_NDELAY) == 0 916 && (filp->f_mode & 3)) { 917 check_disk_change(inode->i_bdev); 918 if (fs->ejected) 919 err = -ENXIO; 920 } 921 922 if (err == 0 && (filp->f_mode & 2)) { 923 if (fs->write_prot < 0) 924 fs->write_prot = swim3_readbit(fs, WRITE_PROT); 925 if (fs->write_prot) 926 err = -EROFS; 927 } 928 929 if (err) { 930 if (fs->ref_count == 0) { 931 swim3_action(fs, MOTOR_OFF); 932 out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE); 933 swim3_select(fs, RELAX); 934 } 935 return err; 936 } 937 938 if (filp->f_flags & O_EXCL) 939 fs->ref_count = -1; 940 else 941 ++fs->ref_count; 942 943 return 0; 944 } 945 946 static int floppy_release(struct inode *inode, struct file *filp) 947 { 948 struct floppy_state *fs = inode->i_bdev->bd_disk->private_data; 949 struct swim3 __iomem *sw = fs->swim3; 950 if (fs->ref_count > 0 && --fs->ref_count == 0) { 951 swim3_action(fs, MOTOR_OFF); 952 out_8(&sw->control_bic, 0xff); 953 swim3_select(fs, RELAX); 954 } 955 return 0; 956 } 957 958 static int floppy_check_change(struct gendisk *disk) 959 { 960 struct floppy_state *fs = disk->private_data; 961 return fs->ejected; 962 } 963 964 static int floppy_revalidate(struct gendisk *disk) 965 { 966 struct floppy_state *fs = disk->private_data; 967 struct swim3 __iomem *sw; 968 int ret, n; 969 970 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD)) 971 return -ENXIO; 972 973 sw = fs->swim3; 974 grab_drive(fs, revalidating, 0); 975 out_8(&sw->intr_enable, 0); 976 out_8(&sw->control_bis, DRIVE_ENABLE); 977 swim3_action(fs, MOTOR_ON); /* necessary? */ 978 fs->write_prot = -1; 979 fs->cur_cyl = -1; 980 mdelay(1); 981 for (n = HZ; n > 0; --n) { 982 if (swim3_readbit(fs, SEEK_COMPLETE)) 983 break; 984 if (signal_pending(current)) 985 break; 986 swim3_select(fs, RELAX); 987 current->state = TASK_INTERRUPTIBLE; 988 schedule_timeout(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 int swim3_init(void) 1013 { 1014 struct device_node *swim; 1015 int err = -ENOMEM; 1016 int i; 1017 1018 devfs_mk_dir("floppy"); 1019 1020 swim = find_devices("floppy"); 1021 while (swim && (floppy_count < MAX_FLOPPIES)) 1022 { 1023 swim3_add_device(swim); 1024 swim = swim->next; 1025 } 1026 1027 swim = find_devices("swim3"); 1028 while (swim && (floppy_count < MAX_FLOPPIES)) 1029 { 1030 swim3_add_device(swim); 1031 swim = swim->next; 1032 } 1033 1034 if (!floppy_count) 1035 return -ENODEV; 1036 1037 for (i = 0; i < floppy_count; i++) { 1038 disks[i] = alloc_disk(1); 1039 if (!disks[i]) 1040 goto out; 1041 } 1042 1043 if (register_blkdev(FLOPPY_MAJOR, "fd")) { 1044 err = -EBUSY; 1045 goto out; 1046 } 1047 1048 swim3_queue = blk_init_queue(do_fd_request, &swim3_lock); 1049 if (!swim3_queue) { 1050 err = -ENOMEM; 1051 goto out_queue; 1052 } 1053 1054 for (i = 0; i < floppy_count; i++) { 1055 struct gendisk *disk = disks[i]; 1056 disk->major = FLOPPY_MAJOR; 1057 disk->first_minor = i; 1058 disk->fops = &floppy_fops; 1059 disk->private_data = &floppy_states[i]; 1060 disk->queue = swim3_queue; 1061 disk->flags |= GENHD_FL_REMOVABLE; 1062 sprintf(disk->disk_name, "fd%d", i); 1063 sprintf(disk->devfs_name, "floppy/%d", i); 1064 set_capacity(disk, 2880); 1065 add_disk(disk); 1066 } 1067 return 0; 1068 1069 out_queue: 1070 unregister_blkdev(FLOPPY_MAJOR, "fd"); 1071 out: 1072 while (i--) 1073 put_disk(disks[i]); 1074 /* shouldn't we do something with results of swim_add_device()? */ 1075 return err; 1076 } 1077 1078 static int swim3_add_device(struct device_node *swim) 1079 { 1080 struct device_node *mediabay; 1081 struct floppy_state *fs = &floppy_states[floppy_count]; 1082 1083 if (swim->n_addrs < 2) 1084 { 1085 printk(KERN_INFO "swim3: expecting 2 addrs (n_addrs:%d, n_intrs:%d)\n", 1086 swim->n_addrs, swim->n_intrs); 1087 return -EINVAL; 1088 } 1089 1090 if (swim->n_intrs < 2) 1091 { 1092 printk(KERN_INFO "swim3: expecting 2 intrs (n_addrs:%d, n_intrs:%d)\n", 1093 swim->n_addrs, swim->n_intrs); 1094 return -EINVAL; 1095 } 1096 1097 if (!request_OF_resource(swim, 0, NULL)) { 1098 printk(KERN_INFO "swim3: can't request IO resource !\n"); 1099 return -EINVAL; 1100 } 1101 1102 mediabay = (strcasecmp(swim->parent->type, "media-bay") == 0) ? swim->parent : NULL; 1103 if (mediabay == NULL) 1104 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1); 1105 1106 memset(fs, 0, sizeof(*fs)); 1107 fs->state = idle; 1108 fs->swim3 = (struct swim3 __iomem *) 1109 ioremap(swim->addrs[0].address, 0x200); 1110 fs->dma = (struct dbdma_regs __iomem *) 1111 ioremap(swim->addrs[1].address, 0x200); 1112 fs->swim3_intr = swim->intrs[0].line; 1113 fs->dma_intr = swim->intrs[1].line; 1114 fs->cur_cyl = -1; 1115 fs->cur_sector = -1; 1116 fs->secpercyl = 36; 1117 fs->secpertrack = 18; 1118 fs->total_secs = 2880; 1119 fs->media_bay = mediabay; 1120 init_waitqueue_head(&fs->wait); 1121 1122 fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space); 1123 memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd)); 1124 st_le16(&fs->dma_cmd[1].command, DBDMA_STOP); 1125 1126 if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) { 1127 printk(KERN_ERR "Couldn't get irq %d for SWIM3\n", fs->swim3_intr); 1128 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0); 1129 return -EBUSY; 1130 } 1131 /* 1132 if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) { 1133 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA", 1134 fs->dma_intr); 1135 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0); 1136 return -EBUSY; 1137 } 1138 */ 1139 1140 init_timer(&fs->timeout); 1141 1142 printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count, 1143 mediabay ? "in media bay" : ""); 1144 1145 floppy_count++; 1146 1147 return 0; 1148 } 1149 1150 module_init(swim3_init) 1151 1152 MODULE_LICENSE("GPL"); 1153 MODULE_AUTHOR("Paul Mackerras"); 1154 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR); 1155