1 /* $NetBSD: fd.c,v 1.45 2000/03/23 06:33:10 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1994 Christian E. Hopps 5 * Copyright (c) 1996 Ezra Story 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Christian E. Hopps. 19 * This product includes software developed by Ezra Story. 20 * 4. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/callout.h> 37 #include <sys/kernel.h> 38 #include <sys/malloc.h> 39 #include <sys/buf.h> 40 #include <sys/device.h> 41 #include <sys/ioctl.h> 42 #include <sys/fcntl.h> 43 #include <sys/disklabel.h> 44 #include <sys/disk.h> 45 #include <sys/dkbad.h> 46 #include <sys/proc.h> 47 #include <machine/cpu.h> 48 #include <amiga/amiga/device.h> 49 #include <amiga/amiga/custom.h> 50 #include <amiga/amiga/cia.h> 51 #include <amiga/amiga/cc.h> 52 53 #include <sys/conf.h> 54 #include <machine/conf.h> 55 56 #include "locators.h" 57 58 enum fdc_bits { FDB_CHANGED = 2, FDB_PROTECT, FDB_CYLZERO, FDB_READY }; 59 /* 60 * partitions in fd represent different format floppies 61 * partition a is 0 etc.. 62 */ 63 enum fd_parttypes { 64 FDAMIGAPART = 0, 65 FDMSDOSPART, 66 FDMAXPARTS 67 }; 68 69 #define FDBBSIZE (8192) 70 #define FDSBSIZE (8192) 71 72 #define FDUNIT(dev) DISKUNIT(dev) 73 #define FDPART(dev) DISKPART(dev) 74 #define FDMAKEDEV(m, u, p) MAKEDISKDEV((m), (u), (p)) 75 76 /* that's nice, but we don't want to always use this as an amiga drive 77 bunghole :-) */ 78 #define FDNHEADS (2) /* amiga drives always have 2 heads */ 79 #define FDSECSIZE (512) /* amiga drives always have 512 byte sectors */ 80 #define FDSECLWORDS (128) 81 82 #define FDSETTLEDELAY (18000) /* usec delay after seeking after switch dir */ 83 #define FDSTEPDELAY (3500) /* usec delay after steping */ 84 #define FDPRESIDEDELAY (1000) /* usec delay before writing can occur */ 85 #define FDWRITEDELAY (1300) /* usec delay after write */ 86 87 #define FDSTEPOUT (1) /* decrease track step */ 88 #define FDSTEPIN (0) /* increase track step */ 89 90 #define FDCUNITMASK (0x78) /* mask for all units (bits 6-3) */ 91 92 #define FDRETRIES (2) /* default number of retries */ 93 #define FDMAXUNITS (4) /* maximum number of supported units */ 94 95 #define DISKLEN_READ (0) /* fake mask for reading */ 96 #define DISKLEN_WRITE (1 << 14) /* bit for writing */ 97 #define DISKLEN_DMAEN (1 << 15) /* dma go */ 98 #define DMABUFSZ ((DISKLEN_WRITE - 1) * 2) /* largest dma possible */ 99 100 #define FDMFMSYNC (0x4489) 101 #define FDMFMID (0x5554) 102 #define FDMFMDATA (0x5545) 103 #define FDMFMGAP1 (0x9254) 104 #define FDMFMGAP2 (0xAAAA) 105 #define FDMFMGAP3 (0x9254) 106 #define CRC16POLY (0x1021) /* (x^16) + x^12 + x^5 + x^0 */ 107 108 /* 109 * Msdos-type MFM encode/decode 110 */ 111 static u_char msdecode[128]; 112 static u_char msencode[16] = 113 { 114 0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15, 115 0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55 116 }; 117 static u_short mscrctab[256]; 118 119 /* 120 5554 aaaa aaaa aaa5 2aa4 4452 aa51 121 00 00 03 02 ac 0d 122 */ 123 124 /* 125 * floppy device type 126 */ 127 struct fdtype { 128 u_int driveid; /* drive identification (from drive) */ 129 u_int ncylinders; /* number of cylinders on drive */ 130 u_int amiga_nsectors; /* number of sectors per amiga track */ 131 u_int msdos_nsectors; /* number of sectors per msdos track */ 132 u_int nreadw; /* number of words (short) read per track */ 133 u_int nwritew; /* number of words (short) written per track */ 134 u_int gap; /* track gap size in long words */ 135 u_int precomp[2]; /* 1st and 2nd precomp values */ 136 char *desc; /* description of drive type (useq) */ 137 }; 138 139 /* 140 * floppy disk device data 141 */ 142 struct fd_softc { 143 struct device sc_dv; /* generic device info; must come first */ 144 struct disk dkdev; /* generic disk info */ 145 struct buf_queue bufq; /* queue pending I/O operations */ 146 struct buf curbuf; /* state of current I/O operation */ 147 struct callout calibrate_ch; 148 struct callout motor_ch; 149 struct fdtype *type; 150 void *cachep; /* cached track data (write through) */ 151 int cachetrk; /* cahced track -1 for none */ 152 int hwunit; /* unit for amiga controlling hw */ 153 int unitmask; /* mask for cia select deslect */ 154 int pstepdir; /* previous step direction */ 155 int curcyl; /* current curcyl head positioned on */ 156 int flags; /* misc flags */ 157 int wlabel; 158 int stepdelay; /* useq to delay after seek user setable */ 159 int nsectors; /* number of sectors per track */ 160 int openpart; /* which partition [ab] == [12] is open */ 161 short retries; /* number of times to retry failed io */ 162 short retried; /* number of times current io retried */ 163 int bytespersec; /* number of bytes per sector */ 164 }; 165 166 /* fd_softc->flags */ 167 #define FDF_MOTORON (0x01) /* motor is running */ 168 #define FDF_MOTOROFF (0x02) /* motor is waiting to be turned off */ 169 #define FDF_WMOTOROFF (0x04) /* unit wants a wakeup after off */ 170 #define FDF_DIRTY (0x08) /* track cache needs write */ 171 #define FDF_WRITEWAIT (0x10) /* need to head select delay on next setpos */ 172 #define FDF_HAVELABEL (0x20) /* label is valid */ 173 #define FDF_JUSTFLUSH (0x40) /* don't bother caching track. */ 174 #define FDF_NOTRACK0 (0x80) /* was not able to recalibrate drive */ 175 176 int fdc_wantwakeup; 177 int fdc_side; 178 void *fdc_dmap; 179 struct fd_softc *fdc_indma; 180 int fdc_dmalen; 181 int fdc_dmawrite; 182 183 struct fdcargs { 184 struct fdtype *type; 185 int unit; 186 }; 187 188 int fdcmatch __P((struct device *, struct cfdata *, void *)); 189 void fdcattach __P((struct device *, struct device *, void *)); 190 int fdcprint __P((void *, const char *)); 191 int fdmatch __P((struct device *, struct cfdata *, void *)); 192 void fdattach __P((struct device *, struct device *, void *)); 193 194 void fdintr __P((int)); 195 void fdidxintr __P((void)); 196 void fdstrategy __P((struct buf *)); 197 int fdloaddisk __P((struct fd_softc *)); 198 void fdgetdefaultlabel __P((struct fd_softc *, struct disklabel *, int)); 199 int fdgetdisklabel __P((struct fd_softc *, dev_t)); 200 int fdsetdisklabel __P((struct fd_softc *, struct disklabel *)); 201 int fdputdisklabel __P((struct fd_softc *, dev_t)); 202 struct fdtype * fdcgetfdtype __P((int)); 203 void fdmotoroff __P((void *)); 204 void fdsetpos __P((struct fd_softc *, int, int)); 205 void fdselunit __P((struct fd_softc *)); 206 void fdstart __P((struct fd_softc *)); 207 void fdcont __P((struct fd_softc *)); 208 void fddmastart __P((struct fd_softc *, int)); 209 void fdcalibrate __P((void *)); 210 void fddmadone __P((struct fd_softc *, int)); 211 void fddone __P((struct fd_softc *)); 212 void fdfindwork __P((int)); 213 void fdminphys __P((struct buf *)); 214 void fdcachetoraw __P((struct fd_softc *)); 215 void amcachetoraw __P((struct fd_softc *)); 216 int amrawtocache __P((struct fd_softc *)); 217 u_long *fdfindsync __P((u_long *, u_long *)); 218 int fdrawtocache __P((struct fd_softc *)); 219 void mscachetoraw __P((struct fd_softc *)); 220 int msrawtocache __P((struct fd_softc *)); 221 u_long *mfmblkencode __P((u_long *, u_long *, u_long *, int)); 222 u_long *mfmblkdecode __P((u_long *, u_long *, u_long *, int)); 223 u_short *msblkdecode __P((u_short *, u_char *, int)); 224 u_short *msblkencode __P((u_short *, u_char *, int, u_short *)); 225 226 struct dkdriver fddkdriver = { fdstrategy }; 227 228 /* 229 * read size is (nsectors + 1) * mfm secsize + gap bytes + 2 shorts 230 * write size is nsectors * mfm secsize + gap bytes + 3 shorts 231 * the extra shorts are to deal with a dma hw bug in the controller 232 * they are probably too much (I belive the bug is 1 short on write and 233 * 3 bits on read) but there is no need to be cheap here. 234 */ 235 #define MAXTRKSZ (22 * FDSECSIZE) 236 struct fdtype fdtype[] = { 237 { 0x00000000, 80, 11, 9, 7358, 6815, 414, { 80, 161 }, "3.5dd" }, 238 { 0x55555555, 40, 11, 9, 7358, 6815, 414, { 80, 161 }, "5.25dd" }, 239 { 0xAAAAAAAA, 80, 22, 18, 14716, 13630, 828, { 80, 161 }, "3.5hd" } 240 }; 241 int nfdtype = sizeof(fdtype) / sizeof(*fdtype); 242 243 struct cfattach fd_ca = { 244 sizeof(struct fd_softc), fdmatch, fdattach 245 }; 246 247 extern struct cfdriver fd_cd; 248 249 struct cfattach fdc_ca = { 250 sizeof(struct device), fdcmatch, fdcattach 251 }; 252 253 /* 254 * all hw access through macros, this helps to hide the active low 255 * properties 256 */ 257 258 #define FDUNITMASK(unit) (1 << (3 + (unit))) 259 260 /* 261 * select units using mask 262 */ 263 #define FDSELECT(um) do { ciab.prb &= ~(um); } while (0) 264 265 /* 266 * deselect units using mask 267 */ 268 #define FDDESELECT(um) do { ciab.prb |= (um); delay(1); } while (0) 269 270 /* 271 * test hw condition bits 272 */ 273 #define FDTESTC(bit) ((ciaa.pra & (1 << (bit))) == 0) 274 275 /* 276 * set motor for select units, true motor on else off 277 */ 278 #define FDSETMOTOR(on) do { \ 279 if (on) ciab.prb &= ~CIAB_PRB_MTR; else ciab.prb |= CIAB_PRB_MTR; \ 280 } while (0) 281 282 /* 283 * set head for select units 284 */ 285 #define FDSETHEAD(head) do { \ 286 if (head) ciab.prb &= ~CIAB_PRB_SIDE; else ciab.prb |= CIAB_PRB_SIDE; \ 287 delay(1); } while (0) 288 289 /* 290 * select direction, true towards spindle else outwards 291 */ 292 #define FDSETDIR(in) do { \ 293 if (in) ciab.prb &= ~CIAB_PRB_DIR; else ciab.prb |= CIAB_PRB_DIR; \ 294 delay(1); } while (0) 295 296 /* 297 * step the selected units 298 */ 299 #define FDSTEP do { \ 300 ciab.prb &= ~CIAB_PRB_STEP; ciab.prb |= CIAB_PRB_STEP; \ 301 } while (0) 302 303 #define FDDMASTART(len, towrite) do { \ 304 int dmasz = (len) | ((towrite) ? DISKLEN_WRITE : 0) | DISKLEN_DMAEN; \ 305 custom.dsklen = dmasz; custom.dsklen = dmasz; } while (0) 306 307 #define FDDMASTOP do { custom.dsklen = 0; } while (0) 308 309 310 int 311 fdcmatch(pdp, cfp, auxp) 312 struct device *pdp; 313 struct cfdata *cfp; 314 void *auxp; 315 { 316 static int fdc_matched = 0; 317 318 /* Allow only once instance. */ 319 if (matchname("fdc", auxp) == 0 || fdc_matched) 320 return(0); 321 if ((fdc_dmap = alloc_chipmem(DMABUFSZ)) == NULL) { 322 printf("fdc: unable to allocate dma buffer\n"); 323 return(0); 324 } 325 326 fdc_matched = 1; 327 return(1); 328 } 329 330 void 331 fdcattach(pdp, dp, auxp) 332 struct device *pdp, *dp; 333 void *auxp; 334 { 335 struct fdcargs args; 336 337 printf(": dmabuf pa 0x%x", kvtop(fdc_dmap)); 338 printf(": dmabuf ka %p\n", fdc_dmap); 339 args.unit = 0; 340 args.type = fdcgetfdtype(args.unit); 341 342 fdc_side = -1; 343 config_found(dp, &args, fdcprint); 344 for (args.unit++; args.unit < FDMAXUNITS; args.unit++) { 345 if ((args.type = fdcgetfdtype(args.unit)) == NULL) 346 continue; 347 config_found(dp, &args, fdcprint); 348 } 349 } 350 351 int 352 fdcprint(auxp, pnp) 353 void *auxp; 354 const char *pnp; 355 { 356 struct fdcargs *fcp; 357 358 fcp = auxp; 359 if (pnp) 360 printf("fd%d at %s unit %d:", fcp->unit, pnp, 361 fcp->type->driveid); 362 return(UNCONF); 363 } 364 365 /*ARGSUSED*/ 366 int 367 fdmatch(pdp, cfp, auxp) 368 struct device *pdp; 369 struct cfdata *cfp; 370 void *auxp; 371 { 372 struct fdcargs *fdap; 373 374 fdap = auxp; 375 if (cfp->cf_loc[FDCCF_UNIT] == fdap->unit || 376 cfp->cf_loc[FDCCF_UNIT] == FDCCF_UNIT_DEFAULT) 377 return(1); 378 379 return(0); 380 } 381 382 void 383 fdattach(pdp, dp, auxp) 384 struct device *pdp, *dp; 385 void *auxp; 386 { 387 struct fdcargs *ap; 388 struct fd_softc *sc; 389 int i; 390 391 ap = auxp; 392 sc = (struct fd_softc *)dp; 393 394 BUFQ_INIT(&sc->bufq); 395 callout_init(&sc->calibrate_ch); 396 callout_init(&sc->motor_ch); 397 398 sc->curcyl = sc->cachetrk = -1; 399 sc->openpart = -1; 400 sc->type = ap->type; 401 sc->hwunit = ap->unit; 402 sc->unitmask = 1 << (3 + ap->unit); 403 sc->retries = FDRETRIES; 404 sc->stepdelay = FDSTEPDELAY; 405 sc->bytespersec = 512; 406 printf(" unit %d: %s %d cyl, %d head, %d sec [%d sec], 512 bytes/sec\n", 407 sc->hwunit, sc->type->desc, sc->type->ncylinders, FDNHEADS, 408 sc->type->amiga_nsectors, sc->type->msdos_nsectors); 409 410 /* 411 * Initialize and attach the disk structure. 412 */ 413 sc->dkdev.dk_name = sc->sc_dv.dv_xname; 414 sc->dkdev.dk_driver = &fddkdriver; 415 disk_attach(&sc->dkdev); 416 417 /* 418 * calibrate the drive 419 */ 420 fdsetpos(sc, 0, 0); 421 fdsetpos(sc, sc->type->ncylinders, 0); 422 fdsetpos(sc, 0, 0); 423 fdmotoroff(sc); 424 425 /* 426 * precalc msdos MFM and CRC 427 */ 428 for (i = 0; i < 128; i++) 429 msdecode[i] = 0xff; 430 for (i = 0; i < 16; i++) 431 msdecode[msencode[i]] = i; 432 for (i = 0; i < 256; i++) { 433 mscrctab[i] = (0x1021 * (i & 0xf0)) ^ (0x1021 * (i & 0x0f)) ^ 434 (0x1021 * (i >> 4)); 435 } 436 437 /* 438 * enable disk related interrupts 439 */ 440 custom.dmacon = DMAF_SETCLR | DMAF_MASTER | DMAF_DISK; 441 custom.intena = INTF_SETCLR | INTF_DSKBLK; 442 ciab.icr = CIA_ICR_FLG; 443 } 444 445 /*ARGSUSED*/ 446 int 447 fdopen(dev, flags, devtype, p) 448 dev_t dev; 449 int flags, devtype; 450 struct proc *p; 451 { 452 struct fd_softc *sc; 453 int wasopen, fwork, error, s; 454 455 error = 0; 456 457 if (FDPART(dev) >= FDMAXPARTS) 458 return(ENXIO); 459 460 if ((sc = getsoftc(fd_cd, FDUNIT(dev))) == NULL) 461 return(ENXIO); 462 if (sc->flags & FDF_NOTRACK0) 463 return(ENXIO); 464 if (sc->cachep == NULL) 465 sc->cachep = malloc(MAXTRKSZ, M_DEVBUF, M_WAITOK); 466 467 s = splbio(); 468 /* 469 * if we are sleeping in fdclose(); waiting for a chance to 470 * shut the motor off, do a sleep here also. 471 */ 472 while (sc->flags & FDF_WMOTOROFF) 473 tsleep(fdmotoroff, PRIBIO, "fdopen", 0); 474 475 fwork = 0; 476 /* 477 * if not open let user open request type, otherwise 478 * ensure they are trying to open same type. 479 */ 480 if (sc->openpart == FDPART(dev)) 481 wasopen = 1; 482 else if (sc->openpart == -1) { 483 sc->openpart = FDPART(dev); 484 wasopen = 0; 485 } else { 486 wasopen = 1; 487 error = EPERM; 488 goto done; 489 } 490 491 /* 492 * wait for current io to complete if any 493 */ 494 if (fdc_indma) { 495 fwork = 1; 496 fdc_wantwakeup++; 497 tsleep(fdopen, PRIBIO, "fdopen", 0); 498 } 499 if ((error = fdloaddisk(sc)) != 0) 500 goto done; 501 if ((error = fdgetdisklabel(sc, dev)) != 0) 502 goto done; 503 #ifdef FDDEBUG 504 printf(" open successful\n"); 505 #endif 506 done: 507 /* 508 * if we requested that fddone()->fdfindwork() wake us, allow it to 509 * complete its job now 510 */ 511 if (fwork) 512 fdfindwork(FDUNIT(dev)); 513 splx(s); 514 515 /* 516 * if we were not open and we marked us so reverse that. 517 */ 518 if (error && wasopen == 0) 519 sc->openpart = -1; 520 return(error); 521 } 522 523 /*ARGSUSED*/ 524 int 525 fdclose(dev, flags, devtype, p) 526 dev_t dev; 527 int flags, devtype; 528 struct proc *p; 529 { 530 struct fd_softc *sc; 531 int s; 532 533 #ifdef FDDEBUG 534 printf("fdclose()\n"); 535 #endif 536 sc = getsoftc(fd_cd, FDUNIT(dev)); 537 s = splbio(); 538 if (sc->flags & FDF_MOTORON) { 539 sc->flags |= FDF_WMOTOROFF; 540 tsleep(fdmotoroff, PRIBIO, "fdclose", 0); 541 sc->flags &= ~FDF_WMOTOROFF; 542 wakeup(fdmotoroff); 543 } 544 sc->openpart = -1; 545 splx(s); 546 return(0); 547 } 548 549 int 550 fdioctl(dev, cmd, addr, flag, p) 551 dev_t dev; 552 u_long cmd; 553 caddr_t addr; 554 int flag; 555 struct proc *p; 556 { 557 struct fd_softc *sc; 558 int error, wlab; 559 560 sc = getsoftc(fd_cd, FDUNIT(dev)); 561 562 if ((sc->flags & FDF_HAVELABEL) == 0) 563 return(EBADF); 564 565 switch (cmd) { 566 case DIOCSBAD: 567 return(EINVAL); 568 case DIOCSRETRIES: 569 if (*(int *)addr < 0) 570 return(EINVAL); 571 sc->retries = *(int *)addr; 572 return(0); 573 case DIOCSSTEP: 574 if (*(int *)addr < FDSTEPDELAY) 575 return(EINVAL); 576 sc->dkdev.dk_label->d_trkseek = sc->stepdelay = *(int *)addr; 577 return(0); 578 case DIOCGDINFO: 579 *(struct disklabel *)addr = *(sc->dkdev.dk_label); 580 return(0); 581 case DIOCGPART: 582 ((struct partinfo *)addr)->disklab = sc->dkdev.dk_label; 583 ((struct partinfo *)addr)->part = 584 &sc->dkdev.dk_label->d_partitions[FDPART(dev)]; 585 return(0); 586 case DIOCSDINFO: 587 if ((flag & FWRITE) == 0) 588 return(EBADF); 589 return(fdsetdisklabel(sc, (struct disklabel *)addr)); 590 case DIOCWDINFO: 591 if ((flag & FWRITE) == 0) 592 return(EBADF); 593 if ((error = fdsetdisklabel(sc, (struct disklabel *)addr)) != 0) 594 return(error); 595 wlab = sc->wlabel; 596 sc->wlabel = 1; 597 error = fdputdisklabel(sc, dev); 598 sc->wlabel = wlab; 599 return(error); 600 case DIOCWLABEL: 601 if ((flag & FWRITE) == 0) 602 return(EBADF); 603 sc->wlabel = *(int *)addr; 604 return(0); 605 case DIOCGDEFLABEL: 606 fdgetdefaultlabel(sc, (struct disklabel *)addr, FDPART(dev)); 607 return(0); 608 default: 609 return(ENOTTY); 610 } 611 } 612 613 /* 614 * no dumps to floppy disks thank you. 615 */ 616 int 617 fdsize(dev) 618 dev_t dev; 619 { 620 return(-1); 621 } 622 623 int 624 fdread(dev, uio, flags) 625 dev_t dev; 626 struct uio *uio; 627 int flags; 628 { 629 return (physio(fdstrategy, NULL, dev, B_READ, fdminphys, uio)); 630 } 631 632 int 633 fdwrite(dev, uio, flags) 634 dev_t dev; 635 struct uio *uio; 636 int flags; 637 { 638 return (physio(fdstrategy, NULL, dev, B_WRITE, fdminphys, uio)); 639 } 640 641 642 void 643 fdintr(flag) 644 int flag; 645 { 646 int s; 647 648 s = splbio(); 649 if (fdc_indma) 650 fddmadone(fdc_indma, 0); 651 splx(s); 652 } 653 654 void 655 fdidxintr() 656 { 657 if (fdc_indma && fdc_dmalen) { 658 /* 659 * turn off intr and start actual dma 660 */ 661 ciab.icr = CIA_ICR_FLG; 662 FDDMASTART(fdc_dmalen, fdc_dmawrite); 663 fdc_dmalen = 0; 664 } 665 } 666 667 void 668 fdstrategy(bp) 669 struct buf *bp; 670 { 671 struct disklabel *lp; 672 struct fd_softc *sc; 673 int unit, part, s; 674 675 unit = FDUNIT(bp->b_dev); 676 part = FDPART(bp->b_dev); 677 sc = getsoftc(fd_cd, unit); 678 679 #ifdef FDDEBUG 680 printf("fdstrategy: 0x%x\n", bp); 681 #endif 682 /* 683 * check for valid partition and bounds 684 */ 685 lp = sc->dkdev.dk_label; 686 if ((sc->flags & FDF_HAVELABEL) == 0) { 687 bp->b_error = EIO; 688 goto bad; 689 } 690 if (bounds_check_with_label(bp, lp, sc->wlabel) <= 0) 691 goto done; 692 693 /* 694 * trans count of zero or bounds check indicates io is done 695 * we are done. 696 */ 697 if (bp->b_bcount == 0) 698 goto done; 699 700 bp->b_rawblkno = bp->b_blkno; 701 702 /* 703 * queue the buf and kick the low level code 704 */ 705 s = splbio(); 706 disksort_cylinder(&sc->bufq, bp); 707 fdstart(sc); 708 splx(s); 709 return; 710 bad: 711 bp->b_flags |= B_ERROR; 712 done: 713 bp->b_resid = bp->b_bcount; 714 biodone(bp); 715 } 716 717 /* 718 * make sure disk is loaded and label is up-to-date. 719 */ 720 int 721 fdloaddisk(sc) 722 struct fd_softc *sc; 723 { 724 /* 725 * if diskchange is low step drive to 0 then up one then to zero. 726 */ 727 fdselunit(sc); /* make sure the unit is selected */ 728 if (FDTESTC(FDB_CHANGED)) { 729 fdsetpos(sc, 0, 0); 730 sc->cachetrk = -1; /* invalidate the cache */ 731 sc->flags &= ~FDF_HAVELABEL; 732 fdsetpos(sc, FDNHEADS, 0); 733 fdsetpos(sc, 0, 0); 734 if (FDTESTC(FDB_CHANGED)) { 735 fdmotoroff(sc); 736 FDDESELECT(sc->unitmask); 737 return(ENXIO); 738 } 739 } 740 FDDESELECT(sc->unitmask); 741 fdmotoroff(sc); 742 sc->type = fdcgetfdtype(sc->hwunit); 743 if (sc->type == NULL) 744 return(ENXIO); 745 if (sc->openpart == FDMSDOSPART) 746 sc->nsectors = sc->type->msdos_nsectors; 747 else 748 sc->nsectors = sc->type->amiga_nsectors; 749 return(0); 750 } 751 752 void 753 fdgetdefaultlabel(sc, lp, part) 754 struct fd_softc *sc; 755 struct disklabel *lp; 756 int part; /* XXX ick */ 757 { 758 759 bzero(lp, sizeof(struct disklabel)); 760 lp->d_secsize = FDSECSIZE; 761 lp->d_ntracks = FDNHEADS; 762 lp->d_ncylinders = sc->type->ncylinders; 763 lp->d_nsectors = sc->nsectors; 764 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 765 lp->d_type = DTYPE_FLOPPY; 766 lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders; 767 lp->d_rpm = 300; /* good guess I suppose. */ 768 lp->d_interleave = 1; /* should change when adding msdos */ 769 sc->stepdelay = lp->d_trkseek = FDSTEPDELAY; 770 lp->d_bbsize = 0; 771 lp->d_sbsize = 0; 772 lp->d_partitions[part].p_size = lp->d_secperunit; 773 lp->d_partitions[part].p_fstype = FS_UNUSED; 774 lp->d_partitions[part].p_fsize = 1024; 775 lp->d_partitions[part].p_frag = 8; 776 lp->d_partitions[part].p_cpg = 2; /* adosfs: reserved blocks */ 777 lp->d_npartitions = part + 1; 778 lp->d_magic = lp->d_magic2 = DISKMAGIC; 779 lp->d_checksum = dkcksum(lp); 780 } 781 782 /* 783 * read disk label, if present otherwise create one 784 * return a new label if raw part and none found, otherwise err. 785 */ 786 int 787 fdgetdisklabel(sc, dev) 788 struct fd_softc *sc; 789 dev_t dev; 790 { 791 struct disklabel *lp, *dlp; 792 struct cpu_disklabel *clp; 793 struct buf *bp; 794 int error, part; 795 796 if (sc->flags & FDF_HAVELABEL && 797 sc->dkdev.dk_label->d_npartitions == (FDPART(dev) + 1)) 798 return(0); 799 #ifdef FDDEBUG 800 printf("fdgetdisklabel()\n"); 801 #endif 802 part = FDPART(dev); 803 lp = sc->dkdev.dk_label; 804 clp = sc->dkdev.dk_cpulabel; 805 bzero(lp, sizeof(struct disklabel)); 806 bzero(clp, sizeof(struct cpu_disklabel)); 807 808 lp->d_secsize = FDSECSIZE; 809 lp->d_ntracks = FDNHEADS; 810 lp->d_ncylinders = sc->type->ncylinders; 811 lp->d_nsectors = sc->nsectors; 812 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 813 lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders; 814 lp->d_npartitions = part + 1; 815 lp->d_partitions[part].p_size = lp->d_secperunit; 816 lp->d_partitions[part].p_fstype = FS_UNUSED; 817 lp->d_partitions[part].p_fsize = 1024; 818 lp->d_partitions[part].p_frag = 8; 819 lp->d_partitions[part].p_cpg = 2; /* for adosfs: reserved blks */ 820 821 sc->flags |= FDF_HAVELABEL; 822 823 bp = (void *)geteblk((int)lp->d_secsize); 824 bp->b_dev = dev; 825 bp->b_blkno = 0; 826 bp->b_cylinder = 0; 827 bp->b_bcount = FDSECSIZE; 828 bp->b_flags = B_BUSY | B_READ; 829 fdstrategy(bp); 830 if ((error = biowait(bp)) != 0) 831 goto nolabel; 832 dlp = (struct disklabel *)(bp->b_data + LABELOFFSET); 833 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC || 834 dkcksum(dlp)) { 835 error = EINVAL; 836 goto nolabel; 837 } 838 bcopy(dlp, lp, sizeof(struct disklabel)); 839 if (lp->d_trkseek > FDSTEPDELAY) 840 sc->stepdelay = lp->d_trkseek; 841 brelse(bp); 842 return(0); 843 nolabel: 844 fdgetdefaultlabel(sc, lp, part); 845 brelse(bp); 846 return(0); 847 } 848 849 /* 850 * set the incore copy of this units disklabel 851 */ 852 int 853 fdsetdisklabel(sc, lp) 854 struct fd_softc *sc; 855 struct disklabel *lp; 856 { 857 struct disklabel *clp; 858 struct partition *pp; 859 860 /* 861 * must have at least opened raw unit to fetch the 862 * raw_part stuff. 863 */ 864 if ((sc->flags & FDF_HAVELABEL) == 0) 865 return(EINVAL); 866 clp = sc->dkdev.dk_label; 867 /* 868 * make sure things check out and we only have one valid 869 * partition 870 */ 871 #ifdef FDDEBUG 872 printf("fdsetdisklabel\n"); 873 #endif 874 if (lp->d_secsize != FDSECSIZE || 875 lp->d_nsectors != clp->d_nsectors || 876 lp->d_ntracks != FDNHEADS || 877 lp->d_ncylinders != clp->d_ncylinders || 878 lp->d_secpercyl != clp->d_secpercyl || 879 lp->d_secperunit != clp->d_secperunit || 880 lp->d_magic != DISKMAGIC || 881 lp->d_magic2 != DISKMAGIC || 882 lp->d_npartitions == 0 || 883 lp->d_npartitions > FDMAXPARTS || 884 (lp->d_partitions[0].p_offset && lp->d_partitions[1].p_offset) || 885 dkcksum(lp)) 886 return(EINVAL); 887 /* 888 * if any partitions are present make sure they 889 * represent the currently open type 890 */ 891 if ((pp = &lp->d_partitions[0])->p_size) { 892 if ((pp = &lp->d_partitions[1])->p_size == 0) 893 goto done; 894 else if (sc->openpart != 1) 895 return(EINVAL); 896 } else if (sc->openpart != 0) 897 return(EINVAL); 898 /* 899 * make sure selected partition is within bounds 900 * XXX on the second check, its to handle a bug in 901 * XXX the cluster routines as they require mutliples 902 * XXX of NBPG currently 903 */ 904 if ((pp->p_offset + pp->p_size >= lp->d_secperunit) || 905 (pp->p_frag * pp->p_fsize % NBPG)) 906 return(EINVAL); 907 done: 908 bcopy(lp, clp, sizeof(struct disklabel)); 909 return(0); 910 } 911 912 /* 913 * write out the incore copy of this units disklabel 914 */ 915 int 916 fdputdisklabel(sc, dev) 917 struct fd_softc *sc; 918 dev_t dev; 919 { 920 struct disklabel *lp, *dlp; 921 struct buf *bp; 922 int error; 923 924 if ((sc->flags & FDF_HAVELABEL) == 0) 925 return(EBADF); 926 #ifdef FDDEBUG 927 printf("fdputdisklabel\n"); 928 #endif 929 /* 930 * get buf and read in sector 0 931 */ 932 lp = sc->dkdev.dk_label; 933 bp = (void *)geteblk((int)lp->d_secsize); 934 bp->b_dev = FDMAKEDEV(major(dev), FDUNIT(dev), RAW_PART); 935 bp->b_blkno = 0; 936 bp->b_cylinder = 0; 937 bp->b_bcount = FDSECSIZE; 938 bp->b_flags = B_BUSY | B_READ; 939 fdstrategy(bp); 940 if ((error = biowait(bp)) != 0) 941 goto done; 942 /* 943 * copy disklabel to buf and write it out syncronous 944 */ 945 dlp = (struct disklabel *)(bp->b_data + LABELOFFSET); 946 bcopy(lp, dlp, sizeof(struct disklabel)); 947 bp->b_blkno = 0; 948 bp->b_cylinder = 0; 949 bp->b_flags = B_WRITE; 950 fdstrategy(bp); 951 error = biowait(bp); 952 done: 953 brelse(bp); 954 return(error); 955 } 956 957 /* 958 * figure out drive type or NULL if none. 959 */ 960 struct fdtype * 961 fdcgetfdtype(unit) 962 int unit; 963 { 964 struct fdtype *ftp; 965 u_long id, idb; 966 int cnt, umask; 967 968 id = 0; 969 umask = 1 << (3 + unit); 970 971 FDDESELECT(FDCUNITMASK); 972 973 FDSETMOTOR(1); 974 delay(1); 975 FDSELECT(umask); 976 delay(1); 977 FDDESELECT(umask); 978 979 FDSETMOTOR(0); 980 delay(1); 981 FDSELECT(umask); 982 delay(1); 983 FDDESELECT(umask); 984 985 for (idb = 0x80000000; idb; idb >>= 1) { 986 FDSELECT(umask); 987 delay(1); 988 if (FDTESTC(FDB_READY) == 0) 989 id |= idb; 990 FDDESELECT(umask); 991 delay(1); 992 } 993 #ifdef FDDEBUG 994 printf("fdcgettype unit %d id 0x%lx\n", unit, id); 995 #endif 996 997 for (cnt = 0, ftp = fdtype; cnt < nfdtype; ftp++, cnt++) 998 if (ftp->driveid == id) 999 return(ftp); 1000 /* 1001 * 3.5dd's at unit 0 do not always return id. 1002 */ 1003 if (unit == 0) 1004 return(fdtype); 1005 return(NULL); 1006 } 1007 1008 /* 1009 * turn motor off if possible otherwise mark as needed and will be done 1010 * later. 1011 */ 1012 void 1013 fdmotoroff(arg) 1014 void *arg; 1015 { 1016 struct fd_softc *sc; 1017 int s; 1018 1019 sc = arg; 1020 s = splbio(); 1021 1022 #ifdef FDDEBUG 1023 printf("fdmotoroff: unit %d\n", sc->hwunit); 1024 #endif 1025 if ((sc->flags & FDF_MOTORON) == 0) 1026 goto done; 1027 /* 1028 * if we have a timeout on a dma operation let fddmadone() 1029 * deal with it. 1030 */ 1031 if (fdc_indma == sc) { 1032 fddmadone(sc, 1); 1033 goto done; 1034 } 1035 #ifdef FDDEBUG 1036 printf(" motor was on, turning off\n"); 1037 #endif 1038 1039 /* 1040 * flush cache if needed 1041 */ 1042 if (sc->flags & FDF_DIRTY) { 1043 sc->flags |= FDF_JUSTFLUSH | FDF_MOTOROFF; 1044 #ifdef FDDEBUG 1045 printf(" flushing dirty buffer first\n"); 1046 #endif 1047 /* 1048 * if dma'ing done for now, fddone() will call us again 1049 */ 1050 if (fdc_indma) 1051 goto done; 1052 fddmastart(sc, sc->cachetrk); 1053 goto done; 1054 } 1055 1056 /* 1057 * if controller is busy just schedule us to be called back 1058 */ 1059 if (fdc_indma) { 1060 /* 1061 * someone else has the controller now 1062 * just set flag and let fddone() call us again. 1063 */ 1064 sc->flags |= FDF_MOTOROFF; 1065 goto done; 1066 } 1067 1068 #ifdef FDDEBUG 1069 printf(" hw turning unit off\n"); 1070 #endif 1071 1072 sc->flags &= ~(FDF_MOTORON | FDF_MOTOROFF); 1073 FDDESELECT(FDCUNITMASK); 1074 FDSETMOTOR(0); 1075 delay(1); 1076 FDSELECT(sc->unitmask); 1077 delay(4); 1078 FDDESELECT(sc->unitmask); 1079 delay(1); 1080 if (sc->flags & FDF_WMOTOROFF) 1081 wakeup(fdmotoroff); 1082 done: 1083 splx(s); 1084 } 1085 1086 /* 1087 * select drive seek to track exit with motor on. 1088 * fdsetpos(x, 0, 0) does calibrates the drive. 1089 */ 1090 void 1091 fdsetpos(sc, trk, towrite) 1092 struct fd_softc *sc; 1093 int trk, towrite; 1094 { 1095 int nstep, sdir, ondly, ncyl, nside; 1096 1097 FDDESELECT(FDCUNITMASK); 1098 FDSETMOTOR(1); 1099 delay(1); 1100 FDSELECT(sc->unitmask); 1101 delay(1); 1102 if ((sc->flags & FDF_MOTORON) == 0) { 1103 ondly = 0; 1104 while (FDTESTC(FDB_READY) == 0) { 1105 delay(1000); 1106 if (++ondly >= 1000) 1107 break; 1108 } 1109 } 1110 sc->flags |= FDF_MOTORON; 1111 1112 ncyl = trk / FDNHEADS; 1113 nside = trk % FDNHEADS; 1114 1115 if (sc->curcyl == ncyl && fdc_side == nside) 1116 return; 1117 1118 if (towrite) 1119 sc->flags |= FDF_WRITEWAIT; 1120 1121 #ifdef FDDEBUG 1122 printf("fdsetpos: cyl %d head %d towrite %d\n", trk / FDNHEADS, 1123 trk % FDNHEADS, towrite); 1124 #endif 1125 nstep = ncyl - sc->curcyl; 1126 if (nstep) { 1127 /* 1128 * figure direction 1129 */ 1130 if (nstep > 0 && ncyl != 0) { 1131 sdir = FDSTEPIN; 1132 FDSETDIR(1); 1133 } else { 1134 nstep = -nstep; 1135 sdir = FDSTEPOUT; 1136 FDSETDIR(0); 1137 } 1138 if (ncyl == 0) { 1139 /* 1140 * either just want cylinder 0 or doing 1141 * a calibrate. 1142 */ 1143 nstep = 256; 1144 while (FDTESTC(FDB_CYLZERO) == 0 && nstep--) { 1145 FDSTEP; 1146 delay(sc->stepdelay); 1147 } 1148 if (nstep < 0) 1149 sc->flags |= FDF_NOTRACK0; 1150 } else { 1151 /* 1152 * step the needed amount amount. 1153 */ 1154 while (nstep--) { 1155 FDSTEP; 1156 delay(sc->stepdelay); 1157 } 1158 } 1159 /* 1160 * if switched directions 1161 * allow drive to settle. 1162 */ 1163 if (sc->pstepdir != sdir) 1164 delay(FDSETTLEDELAY); 1165 sc->pstepdir = sdir; 1166 sc->curcyl = ncyl; 1167 } 1168 if (nside == fdc_side) 1169 return; 1170 /* 1171 * select side 1172 */ 1173 fdc_side = nside; 1174 FDSETHEAD(nside); 1175 delay(FDPRESIDEDELAY); 1176 } 1177 1178 void 1179 fdselunit(sc) 1180 struct fd_softc *sc; 1181 { 1182 FDDESELECT(FDCUNITMASK); /* deselect all */ 1183 FDSETMOTOR(sc->flags & FDF_MOTORON); /* set motor to unit's state */ 1184 delay(1); 1185 FDSELECT(sc->unitmask); /* select unit */ 1186 delay(1); 1187 } 1188 1189 /* 1190 * process next buf on device queue. 1191 * normall sequence of events: 1192 * fdstart() -> fddmastart(); 1193 * fdidxintr(); 1194 * fdintr() -> fddmadone() -> fddone(); 1195 * if the track is in the cache then fdstart() will short-circuit 1196 * to fddone() else if the track cache is dirty it will flush. If 1197 * the buf is not an entire track it will cache the requested track. 1198 */ 1199 void 1200 fdstart(sc) 1201 struct fd_softc *sc; 1202 { 1203 int trk, error, write; 1204 struct buf *bp, *dp; 1205 int changed; 1206 1207 #ifdef FDDEBUG 1208 printf("fdstart: unit %d\n", sc->hwunit); 1209 #endif 1210 1211 /* 1212 * if dma'ing just return. we must have been called from fdstartegy. 1213 */ 1214 if (fdc_indma) 1215 return; 1216 1217 /* 1218 * get next buf if there. 1219 */ 1220 dp = &sc->curbuf; 1221 if ((bp = BUFQ_FIRST(&sc->bufq)) == NULL) { 1222 #ifdef FDDEBUG 1223 printf(" nothing to do\n"); 1224 #endif 1225 return; 1226 } 1227 1228 /* 1229 * Mark us as busy now, in case fddone() gets called in one 1230 * of the cases below. 1231 */ 1232 disk_busy(&sc->dkdev); 1233 1234 /* 1235 * make sure same disk is loaded 1236 */ 1237 fdselunit(sc); 1238 changed = FDTESTC(FDB_CHANGED); 1239 FDDESELECT(sc->unitmask); 1240 if (changed) { 1241 /* 1242 * disk missing, invalidate all future io on 1243 * this unit until re-open()'ed also invalidate 1244 * all current io 1245 */ 1246 printf("fdstart: disk changed\n"); 1247 #ifdef FDDEBUG 1248 printf(" disk was removed invalidating all io\n"); 1249 #endif 1250 sc->flags &= ~FDF_HAVELABEL; 1251 for (;;) { 1252 bp->b_flags |= B_ERROR; 1253 bp->b_error = EIO; 1254 if (BUFQ_NEXT(bp) == NULL) 1255 break; 1256 biodone(bp); 1257 bp = BUFQ_NEXT(bp); 1258 } 1259 /* 1260 * do fddone() on last buf to allow other units to start. 1261 */ 1262 BUFQ_INSERT_HEAD(&sc->bufq, bp); 1263 fddone(sc); 1264 return; 1265 } 1266 1267 /* 1268 * we have a valid buf, setup our local version 1269 * we use this count to allow reading over multiple tracks. 1270 * into a single buffer 1271 */ 1272 dp->b_bcount = bp->b_bcount; 1273 dp->b_blkno = bp->b_blkno; 1274 dp->b_data = bp->b_data; 1275 dp->b_flags = bp->b_flags; 1276 dp->b_resid = 0; 1277 1278 if (bp->b_flags & B_READ) 1279 write = 0; 1280 else if (FDTESTC(FDB_PROTECT) == 0) 1281 write = 1; 1282 else { 1283 error = EPERM; 1284 goto bad; 1285 } 1286 1287 /* 1288 * figure trk given blkno 1289 */ 1290 trk = bp->b_blkno / sc->nsectors; 1291 1292 /* 1293 * check to see if same as currently cached track 1294 * if so we need to do no dma read. 1295 */ 1296 if (trk == sc->cachetrk) { 1297 fddone(sc); 1298 return; 1299 } 1300 1301 /* 1302 * if we will be overwriting the entire cache, don't bother to 1303 * fetch it. 1304 */ 1305 if (bp->b_bcount == (sc->nsectors * FDSECSIZE) && write && 1306 bp->b_blkno % sc->nsectors == 0) { 1307 if (sc->flags & FDF_DIRTY) 1308 sc->flags |= FDF_JUSTFLUSH; 1309 else { 1310 sc->cachetrk = trk; 1311 fddone(sc); 1312 return; 1313 } 1314 } 1315 1316 /* 1317 * start dma read of `trk' 1318 */ 1319 fddmastart(sc, trk); 1320 return; 1321 bad: 1322 bp->b_flags |= B_ERROR; 1323 bp->b_error = error; 1324 fddone(sc); 1325 } 1326 1327 /* 1328 * continue a started operation on next track. always begin at 1329 * sector 0 on the next track. 1330 */ 1331 void 1332 fdcont(sc) 1333 struct fd_softc *sc; 1334 { 1335 struct buf *dp, *bp; 1336 int trk, write; 1337 1338 dp = &sc->curbuf; 1339 bp = BUFQ_FIRST(&sc->bufq); 1340 dp->b_data += (dp->b_bcount - bp->b_resid); 1341 dp->b_blkno += (dp->b_bcount - bp->b_resid) / FDSECSIZE; 1342 dp->b_bcount = bp->b_resid; 1343 1344 /* 1345 * figure trk given blkno 1346 */ 1347 trk = dp->b_blkno / sc->nsectors; 1348 #ifdef DEBUG 1349 if (trk != sc->cachetrk + 1 || dp->b_blkno % sc->nsectors != 0) 1350 panic("fdcont: confused"); 1351 #endif 1352 if (dp->b_flags & B_READ) 1353 write = 0; 1354 else 1355 write = 1; 1356 /* 1357 * if we will be overwriting the entire cache, don't bother to 1358 * fetch it. 1359 */ 1360 if (dp->b_bcount == (sc->nsectors * FDSECSIZE) && write) { 1361 if (sc->flags & FDF_DIRTY) 1362 sc->flags |= FDF_JUSTFLUSH; 1363 else { 1364 sc->cachetrk = trk; 1365 fddone(sc); 1366 return; 1367 } 1368 } 1369 /* 1370 * start dma read of `trk' 1371 */ 1372 fddmastart(sc, trk); 1373 return; 1374 } 1375 1376 void 1377 fddmastart(sc, trk) 1378 struct fd_softc *sc; 1379 int trk; 1380 { 1381 int adkmask, ndmaw, write, dmatrk; 1382 1383 #ifdef FDDEBUG 1384 printf("fddmastart: unit %d cyl %d head %d", sc->hwunit, 1385 trk / FDNHEADS, trk % FDNHEADS); 1386 #endif 1387 /* 1388 * flush the cached track if dirty else read requested track. 1389 */ 1390 if (sc->flags & FDF_DIRTY) { 1391 fdcachetoraw(sc); 1392 ndmaw = sc->type->nwritew; 1393 dmatrk = sc->cachetrk; 1394 write = 1; 1395 } else { 1396 ndmaw = sc->type->nreadw; 1397 dmatrk = trk; 1398 write = 0; 1399 } 1400 1401 #ifdef FDDEBUG 1402 printf(" %s", write ? " flushing cache\n" : " loading cache\n"); 1403 #endif 1404 sc->cachetrk = trk; 1405 fdc_indma = sc; 1406 fdsetpos(sc, dmatrk, write); 1407 1408 /* 1409 * setup dma stuff 1410 */ 1411 if (write == 0) { 1412 custom.adkcon = ADKF_MSBSYNC; 1413 custom.adkcon = ADKF_SETCLR | ADKF_WORDSYNC | ADKF_FAST; 1414 custom.dsksync = FDMFMSYNC; 1415 } else { 1416 custom.adkcon = ADKF_PRECOMP1 | ADKF_PRECOMP0 | ADKF_WORDSYNC | 1417 ADKF_MSBSYNC; 1418 adkmask = ADKF_SETCLR | ADKF_FAST | ADKF_MFMPREC; 1419 if (dmatrk >= sc->type->precomp[0]) 1420 adkmask |= ADKF_PRECOMP0; 1421 if (dmatrk >= sc->type->precomp[1]) 1422 adkmask |= ADKF_PRECOMP1; 1423 custom.adkcon = adkmask; 1424 } 1425 custom.dskpt = (u_char *)kvtop(fdc_dmap); 1426 1427 /* 1428 * If writing an MSDOS track, activate disk index pulse 1429 * interrupt, dma will be started in the intr routine fdidxintr() 1430 * Otherwise, start the DMA here. 1431 */ 1432 if (write && sc->openpart == FDMSDOSPART) { 1433 fdc_dmalen = ndmaw; 1434 fdc_dmawrite = write; 1435 ciab.icr = CIA_ICR_IR_SC | CIA_ICR_FLG; 1436 } else { 1437 FDDMASTART(ndmaw, write); 1438 fdc_dmalen = 0; 1439 } 1440 1441 #ifdef FDDEBUG 1442 printf(" dma started\n"); 1443 #endif 1444 } 1445 1446 /* 1447 * recalibrate the drive 1448 */ 1449 void 1450 fdcalibrate(arg) 1451 void *arg; 1452 { 1453 struct fd_softc *sc; 1454 static int loopcnt; 1455 1456 sc = arg; 1457 1458 if (loopcnt == 0) { 1459 /* 1460 * seek cyl 0 1461 */ 1462 fdc_indma = sc; 1463 sc->stepdelay += 900; 1464 if (sc->cachetrk > 1) 1465 fdsetpos(sc, sc->cachetrk % FDNHEADS, 0); 1466 sc->stepdelay -= 900; 1467 } 1468 if (loopcnt++ & 1) 1469 fdsetpos(sc, sc->cachetrk, 0); 1470 else 1471 fdsetpos(sc, sc->cachetrk + FDNHEADS, 0); 1472 /* 1473 * trk++, trk, trk++, trk, trk++, trk, trk++, trk and dma 1474 */ 1475 if (loopcnt < 8) 1476 callout_reset(&sc->calibrate_ch, hz / 8, fdcalibrate, sc); 1477 else { 1478 loopcnt = 0; 1479 fdc_indma = NULL; 1480 callout_reset(&sc->motor_ch, 3 * hz / 2, fdmotoroff, sc); 1481 fddmastart(sc, sc->cachetrk); 1482 } 1483 } 1484 1485 void 1486 fddmadone(sc, timeo) 1487 struct fd_softc *sc; 1488 int timeo; 1489 { 1490 #ifdef FDDEBUG 1491 printf("fddmadone: unit %d, timeo %d\n", sc->hwunit, timeo); 1492 #endif 1493 fdc_indma = NULL; 1494 callout_stop(&sc->motor_ch); 1495 FDDMASTOP; 1496 1497 /* 1498 * guarantee the drive has been at current head and cyl 1499 * for at least FDWRITEDELAY after a write. 1500 */ 1501 if (sc->flags & FDF_WRITEWAIT) { 1502 delay(FDWRITEDELAY); 1503 sc->flags &= ~FDF_WRITEWAIT; 1504 } 1505 1506 if ((sc->flags & FDF_MOTOROFF) == 0) { 1507 /* 1508 * motor runs for 1.5 seconds after last dma 1509 */ 1510 callout_reset(&sc->motor_ch, 3 * hz / 2, fdmotoroff, sc); 1511 } 1512 if (sc->flags & FDF_DIRTY) { 1513 /* 1514 * if buffer dirty, the last dma cleaned it 1515 */ 1516 sc->flags &= ~FDF_DIRTY; 1517 if (timeo) 1518 printf("%s: write of track cache timed out.\n", 1519 sc->sc_dv.dv_xname); 1520 if (sc->flags & FDF_JUSTFLUSH) { 1521 sc->flags &= ~FDF_JUSTFLUSH; 1522 /* 1523 * we are done dma'ing 1524 */ 1525 fddone(sc); 1526 return; 1527 } 1528 /* 1529 * load the cache 1530 */ 1531 fddmastart(sc, sc->cachetrk); 1532 return; 1533 } 1534 #ifdef FDDEBUG 1535 else if (sc->flags & FDF_MOTOROFF) 1536 panic("fddmadone: FDF_MOTOROFF with no FDF_DIRTY"); 1537 #endif 1538 1539 /* 1540 * cache loaded decode it into cache buffer 1541 */ 1542 if (timeo == 0 && fdrawtocache(sc) == 0) 1543 sc->retried = 0; 1544 else { 1545 #ifdef FDDEBUG 1546 if (timeo) 1547 printf("%s: fddmadone: cache load timed out.\n", 1548 sc->sc_dv.dv_xname); 1549 #endif 1550 if (sc->retried >= sc->retries) { 1551 sc->retried = 0; 1552 sc->cachetrk = -1; 1553 } else { 1554 sc->retried++; 1555 /* 1556 * this will be restarted at end of calibrate loop. 1557 */ 1558 callout_stop(&sc->motor_ch); 1559 fdcalibrate(sc); 1560 return; 1561 } 1562 } 1563 fddone(sc); 1564 } 1565 1566 void 1567 fddone(sc) 1568 struct fd_softc *sc; 1569 { 1570 struct buf *dp, *bp; 1571 char *data; 1572 int sz; 1573 1574 #ifdef FDDEBUG 1575 printf("fddone: unit %d\n", sc->hwunit); 1576 #endif 1577 /* 1578 * check to see if unit is just flushing the cache, 1579 * that is we have no io queued. 1580 */ 1581 if (sc->flags & FDF_MOTOROFF) 1582 goto nobuf; 1583 1584 dp = &sc->curbuf; 1585 if ((bp = BUFQ_FIRST(&sc->bufq)) == NULL) 1586 panic ("fddone"); 1587 /* 1588 * check for an error that may have occured 1589 * while getting the track. 1590 */ 1591 if (sc->cachetrk == -1) { 1592 sc->retried = 0; 1593 bp->b_flags |= B_ERROR; 1594 bp->b_error = EIO; 1595 } else if ((bp->b_flags & B_ERROR) == 0) { 1596 data = sc->cachep; 1597 /* 1598 * get offset of data in track cache and limit 1599 * the copy size to not exceed the cache's end. 1600 */ 1601 data += (dp->b_blkno % sc->nsectors) * FDSECSIZE; 1602 sz = sc->nsectors - dp->b_blkno % sc->nsectors; 1603 sz *= FDSECSIZE; 1604 sz = min(dp->b_bcount, sz); 1605 if (bp->b_flags & B_READ) 1606 bcopy(data, dp->b_data, sz); 1607 else { 1608 bcopy(dp->b_data, data, sz); 1609 sc->flags |= FDF_DIRTY; 1610 } 1611 bp->b_resid = dp->b_bcount - sz; 1612 if (bp->b_resid == 0) { 1613 bp->b_error = 0; 1614 } else { 1615 /* 1616 * not done yet need to read next track 1617 */ 1618 fdcont(sc); 1619 return; 1620 } 1621 } 1622 /* 1623 * remove from queue. 1624 */ 1625 BUFQ_REMOVE(&sc->bufq, bp); 1626 1627 disk_unbusy(&sc->dkdev, (bp->b_bcount - bp->b_resid)); 1628 1629 biodone(bp); 1630 nobuf: 1631 fdfindwork(sc->sc_dv.dv_unit); 1632 } 1633 1634 void 1635 fdfindwork(unit) 1636 int unit; 1637 { 1638 struct fd_softc *ssc, *sc; 1639 int i, last; 1640 1641 /* 1642 * first see if we have any fdopen()'s waiting 1643 */ 1644 if (fdc_wantwakeup) { 1645 wakeup(fdopen); 1646 fdc_wantwakeup--; 1647 return; 1648 } 1649 1650 /* 1651 * start next available unit, linear search from the next unit 1652 * wrapping and finally this unit. 1653 */ 1654 last = 0; 1655 ssc = NULL; 1656 for (i = unit + 1; last == 0; i++) { 1657 if (i == unit) 1658 last = 1; 1659 if (i >= fd_cd.cd_ndevs) { 1660 i = -1; 1661 continue; 1662 } 1663 if ((sc = fd_cd.cd_devs[i]) == NULL) 1664 continue; 1665 1666 /* 1667 * if unit has requested to be turned off 1668 * and it has no buf's queued do it now 1669 */ 1670 if (sc->flags & FDF_MOTOROFF) { 1671 if (BUFQ_FIRST(&sc->bufq) == NULL) 1672 fdmotoroff(sc); 1673 else { 1674 /* 1675 * we gained a buf request while 1676 * we waited, forget the motoroff 1677 */ 1678 sc->flags &= ~FDF_MOTOROFF; 1679 } 1680 /* 1681 * if we now have dma unit must have needed 1682 * flushing, quit 1683 */ 1684 if (fdc_indma) 1685 return; 1686 } 1687 /* 1688 * if we have no start unit and the current unit has 1689 * io waiting choose this unit to start. 1690 */ 1691 if (ssc == NULL && BUFQ_FIRST(&sc->bufq) != NULL) 1692 ssc = sc; 1693 } 1694 if (ssc) 1695 fdstart(ssc); 1696 } 1697 1698 /* 1699 * min byte count to whats left of the track in question 1700 */ 1701 void 1702 fdminphys(bp) 1703 struct buf *bp; 1704 { 1705 struct fd_softc *sc; 1706 int trk, sec, toff, tsz; 1707 1708 if ((sc = getsoftc(fd_cd, FDUNIT(bp->b_dev))) == NULL) 1709 panic("fdminphys: couldn't get softc"); 1710 1711 trk = bp->b_blkno / sc->nsectors; 1712 sec = bp->b_blkno % sc->nsectors; 1713 1714 toff = sec * FDSECSIZE; 1715 tsz = sc->nsectors * FDSECSIZE; 1716 #ifdef FDDEBUG 1717 printf("fdminphys: before %d", bp->b_bcount); 1718 #endif 1719 bp->b_bcount = min(bp->b_bcount, tsz - toff); 1720 #ifdef FDDEBUG 1721 printf(" after %d\n", bp->b_bcount); 1722 #endif 1723 minphys(bp); 1724 } 1725 1726 /* 1727 * encode the track cache into raw MFM ready for dma 1728 * when we go to multiple disk formats, this will call type dependent 1729 * functions 1730 */ 1731 void fdcachetoraw(sc) 1732 struct fd_softc *sc; 1733 { 1734 if (sc->openpart == FDMSDOSPART) 1735 mscachetoraw(sc); 1736 else 1737 amcachetoraw(sc); 1738 } 1739 1740 /* 1741 * decode raw MFM from dma into units track cache. 1742 * when we go to multiple disk formats, this will call type dependent 1743 * functions 1744 */ 1745 int 1746 fdrawtocache(sc) 1747 struct fd_softc *sc; 1748 { 1749 1750 if (sc->openpart == FDMSDOSPART) 1751 return(msrawtocache(sc)); 1752 else 1753 return(amrawtocache(sc)); 1754 } 1755 1756 void 1757 amcachetoraw(sc) 1758 struct fd_softc *sc; 1759 { 1760 static u_long mfmnull[4]; 1761 u_long *rp, *crp, *dp, hcksum, dcksum, info, zero; 1762 int sec, i; 1763 1764 rp = fdc_dmap; 1765 1766 /* 1767 * not yet one sector (- 1 long) gap. 1768 * for now use previous drivers values 1769 */ 1770 for (i = 0; i < sc->type->gap; i++) 1771 *rp++ = 0xaaaaaaaa; 1772 /* 1773 * process sectors 1774 */ 1775 dp = sc->cachep; 1776 zero = 0; 1777 info = 0xff000000 | (sc->cachetrk << 16) | sc->nsectors; 1778 for (sec = 0; sec < sc->nsectors; sec++, info += (1 << 8) - 1) { 1779 hcksum = dcksum = 0; 1780 /* 1781 * sector format 1782 * offset description 1783 *----------------------------------- 1784 * 0 null 1785 * 1 sync 1786 * oddbits evenbits 1787 *---------------------- 1788 * 2 3 [0xff]b [trk]b [sec]b [togap]b 1789 * 4-7 8-11 null 1790 * 12 13 header cksum [2-11] 1791 * 14 15 data cksum [16-271] 1792 * 16-143 144-271 data 1793 */ 1794 *rp = 0xaaaaaaaa; 1795 if (*(rp - 1) & 0x1) 1796 *rp &= 0x7fffffff; /* clock bit correction */ 1797 rp++; 1798 *rp++ = (FDMFMSYNC << 16) | FDMFMSYNC; 1799 rp = mfmblkencode(&info, rp, &hcksum, 1); 1800 rp = mfmblkencode(mfmnull, rp, &hcksum, 4); 1801 rp = mfmblkencode(&hcksum, rp, NULL, 1); 1802 1803 crp = rp; 1804 rp = mfmblkencode(dp, rp + 2, &dcksum, FDSECLWORDS); 1805 dp += FDSECLWORDS; 1806 crp = mfmblkencode(&dcksum, crp, NULL, 1); 1807 if (*(crp - 1) & 0x1) 1808 *crp &= 0x7fffffff; /* clock bit correction */ 1809 else if ((*crp & 0x40000000) == 0) 1810 *crp |= 0x80000000; 1811 } 1812 *rp = 0xaaa80000; 1813 if (*(rp - 1) & 0x1) 1814 *rp &= 0x7fffffff; 1815 } 1816 1817 u_long * 1818 fdfindsync(rp, ep) 1819 u_long *rp, *ep; 1820 { 1821 u_short *sp; 1822 1823 sp = (u_short *)rp; 1824 while ((u_long *)sp < ep && *sp != FDMFMSYNC) 1825 sp++; 1826 while ((u_long *)sp < ep && *sp == FDMFMSYNC) 1827 sp++; 1828 if ((u_long *)sp < ep) 1829 return((u_long *)sp); 1830 return(NULL); 1831 } 1832 1833 int 1834 amrawtocache(sc) 1835 struct fd_softc *sc; 1836 { 1837 u_long mfmnull[4]; 1838 u_long *dp, *rp, *erp, *crp, *srp, hcksum, dcksum, info, cktmp; 1839 int cnt, doagain; 1840 1841 doagain = 1; 1842 srp = rp = fdc_dmap; 1843 erp = (u_long *)((u_short *)rp + sc->type->nreadw); 1844 cnt = 0; 1845 again: 1846 if (doagain == 0 || (rp = srp = fdfindsync(srp, erp)) == NULL) { 1847 #ifdef DIAGNOSTIC 1848 printf("%s: corrupted track (%d) data.\n", 1849 sc->sc_dv.dv_xname, sc->cachetrk); 1850 #endif 1851 return(-1); 1852 } 1853 1854 /* 1855 * process sectors 1856 */ 1857 for (; cnt < sc->nsectors; cnt++) { 1858 hcksum = dcksum = 0; 1859 rp = mfmblkdecode(rp, &info, &hcksum, 1); 1860 rp = mfmblkdecode(rp, mfmnull, &hcksum, 4); 1861 rp = mfmblkdecode(rp, &cktmp, NULL, 1); 1862 if (cktmp != hcksum) { 1863 #ifdef FDDEBUG 1864 printf(" info 0x%x hchksum 0x%x trkhcksum 0x%x\n", 1865 info, hcksum, cktmp); 1866 #endif 1867 goto again; 1868 } 1869 if (((info >> 16) & 0xff) != sc->cachetrk) { 1870 #ifdef DEBUG 1871 printf("%s: incorrect track found: 0x%lx %d\n", 1872 sc->sc_dv.dv_xname, info, sc->cachetrk); 1873 #endif 1874 goto again; 1875 } 1876 #ifdef FDDEBUG 1877 printf(" info 0x%x\n", info); 1878 #endif 1879 1880 rp = mfmblkdecode(rp, &cktmp, NULL, 1); 1881 dp = sc->cachep; 1882 dp += FDSECLWORDS * ((info >> 8) & 0xff); 1883 crp = mfmblkdecode(rp, dp, &dcksum, FDSECLWORDS); 1884 if (cktmp != dcksum) { 1885 #ifdef FDDEBUG 1886 printf(" info 0x%x dchksum 0x%x trkdcksum 0x%x\n", 1887 info, dcksum, cktmp); 1888 #endif 1889 goto again; 1890 } 1891 1892 /* 1893 * if we are at gap then we can no longer be sure 1894 * of correct sync marks 1895 */ 1896 if ((info && 0xff) == 1) 1897 doagain = 1; 1898 else 1899 doagain = 0; 1900 srp = rp = fdfindsync(crp, erp); 1901 } 1902 return(0); 1903 } 1904 1905 void 1906 mscachetoraw(sc) 1907 struct fd_softc *sc; 1908 { 1909 u_short *rp, *erp, crc; 1910 u_char *cp, tb[5]; 1911 int sec, i; 1912 1913 rp = (u_short *)fdc_dmap; 1914 erp = rp + sc->type->nwritew; 1915 cp = sc->cachep; 1916 1917 /* 1918 * initial track filler (828 * GAP1) 1919 */ 1920 for (i = 0; i < sc->type->gap; i++) { 1921 *rp++ = FDMFMGAP1; 1922 *rp++ = FDMFMGAP1; 1923 } 1924 1925 for (sec = 0; sec < sc->nsectors; sec++) { 1926 1927 /* 1928 * leading sector gap 1929 * (12 * GAP2) + (3 * SYNC) 1930 */ 1931 for (i = 0; i < 12; i++) 1932 *rp++ = FDMFMGAP2; 1933 *rp++ = FDMFMSYNC; 1934 *rp++ = FDMFMSYNC; 1935 *rp++ = FDMFMSYNC; 1936 1937 /* 1938 * sector information 1939 * (ID) + track + side + sector + sector size + CRC16 1940 */ 1941 *rp++ = FDMFMID; 1942 tb[0] = sc->cachetrk / FDNHEADS; 1943 tb[1] = sc->cachetrk % FDNHEADS; 1944 tb[2] = sec + 1; 1945 i = sc->bytespersec; 1946 tb[3] = i < 256 ? 0 : (i < 512 ? 1 : (i < 1024 ? 2 : 3)); 1947 rp = msblkencode(rp, tb, 4, &crc); 1948 tb[0] = crc >> 8; 1949 tb[1] = crc & 0xff; 1950 tb[2] = 0x4e; /* GAP1 decoded */ 1951 rp = msblkencode(rp, tb, 3, 0); 1952 1953 /* 1954 * sector info/data gap 1955 * (22 * GAP1) + (12 * GAP2) + (3 * SYNC) 1956 */ 1957 for (i = 0; i < 21; i++) 1958 *rp++ = FDMFMGAP1; 1959 for (i = 0; i < 12; i++) 1960 *rp++ = FDMFMGAP2; 1961 *rp++ = FDMFMSYNC; 1962 *rp++ = FDMFMSYNC; 1963 *rp++ = FDMFMSYNC; 1964 1965 /* 1966 * sector data 1967 * (DATA) + ...data... + CRC16 1968 */ 1969 *rp++ = FDMFMDATA; 1970 rp = msblkencode(rp, cp, sc->bytespersec, &crc); 1971 cp += sc->bytespersec; 1972 tb[0] = crc >> 8; 1973 tb[1] = crc & 0xff; 1974 tb[2] = 0x4e; /* GAP3 decoded */ 1975 rp = msblkencode(rp, tb, 3, 0); 1976 1977 /* 1978 * trailing sector gap 1979 * (80 * GAP3) 1980 */ 1981 for (i = 0; i < 79; i++) 1982 *rp++ = FDMFMGAP3; 1983 } 1984 1985 /* 1986 * fill rest of track with GAP3 1987 */ 1988 while (rp != erp) 1989 *rp++ = FDMFMGAP3; 1990 1991 } 1992 1993 int 1994 msrawtocache(sc) 1995 struct fd_softc *sc; 1996 { 1997 u_short *rp, *srp, *erp; 1998 u_char tb[5], *cp; 1999 int ct, sec, retry; 2000 2001 srp = rp = (u_short *)fdc_dmap; 2002 erp = rp + sc->type->nreadw; 2003 cp = sc->cachep; 2004 2005 for (ct = 0; ct < sc->nsectors; ct++) { 2006 retry = 1; 2007 do { 2008 /* 2009 * skip leading gap to sync 2010 */ 2011 if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) { 2012 #ifdef DIAGNOSTIC 2013 printf("%s: corrupted track (%d) data.\n", 2014 sc->sc_dv.dv_xname, sc->cachetrk); 2015 #endif 2016 return(-1); 2017 } 2018 2019 /* 2020 * Grab sector info 2021 */ 2022 if (*rp++ != FDMFMID) 2023 continue; 2024 rp = msblkdecode(rp, tb, 4); 2025 #ifdef FDDEBUG 2026 printf("sector id: sector %d, track %d, side %d," 2027 "bps %d\n", tb[2], tb[0], tb[1], 128 << tb[3]); 2028 #endif 2029 if ((tb[0] * FDNHEADS + tb[1]) != sc->cachetrk || 2030 tb[2] > sc->nsectors) 2031 continue; 2032 2033 sec = tb[2]; 2034 sc->bytespersec = 128 << tb[3]; 2035 rp += 2; /* skip CRC-16 */ 2036 2037 /* 2038 * skip gap and read in data 2039 */ 2040 if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) 2041 return(-1); 2042 if (*rp++ != FDMFMDATA) 2043 continue; 2044 rp = msblkdecode(rp, cp + ((sec-1) * sc->bytespersec), 2045 sc->bytespersec); 2046 rp += 2; /* skip CRC-16 */ 2047 2048 retry = 0; 2049 } while (retry); 2050 } 2051 return(0); 2052 } 2053 2054 /* 2055 * encode len longwords of `dp' data in amiga mfm block format (`rp') 2056 * this format specified that the odd bits are at current pos and even 2057 * bits at len + current pos 2058 */ 2059 u_long * 2060 mfmblkencode(dp, rp, cp, len) 2061 u_long *dp, *rp, *cp; 2062 int len; 2063 { 2064 u_long *sdp, *edp, d, dtmp, correct; 2065 2066 sdp = dp; 2067 edp = dp + len; 2068 2069 if (*(rp - 1) & 0x1) 2070 correct = 1; 2071 else 2072 correct = 0; 2073 /* 2074 * do odd bits 2075 */ 2076 while (dp < edp) { 2077 d = (*dp >> 1) & 0x55555555; /* remove clock bits */ 2078 dtmp = d ^ 0x55555555; 2079 d |= ((dtmp >> 1) | 0x80000000) & (dtmp << 1); 2080 /* 2081 * correct upper clock bit if needed 2082 */ 2083 if (correct) 2084 d &= 0x7fffffff; 2085 if (d & 0x1) 2086 correct = 1; 2087 else 2088 correct = 0; 2089 /* 2090 * do checksums and store in raw buffer 2091 */ 2092 if (cp) 2093 *cp ^= d; 2094 *rp++ = d; 2095 dp++; 2096 } 2097 /* 2098 * do even bits 2099 */ 2100 dp = sdp; 2101 while (dp < edp) { 2102 d = *dp & 0x55555555; /* remove clock bits */ 2103 dtmp = d ^ 0x55555555; 2104 d |= ((dtmp >> 1) | 0x80000000) & (dtmp << 1); 2105 /* 2106 * correct upper clock bit if needed 2107 */ 2108 if (correct) 2109 d &= 0x7fffffff; 2110 if (d & 0x1) 2111 correct = 1; 2112 else 2113 correct = 0; 2114 /* 2115 * do checksums and store in raw buffer 2116 */ 2117 if (cp) 2118 *cp ^= d; 2119 *rp++ = d; 2120 dp++; 2121 } 2122 if (cp) 2123 *cp &= 0x55555555; 2124 return(rp); 2125 } 2126 2127 /* 2128 * decode len longwords of `dp' data in amiga mfm block format (`rp') 2129 * this format specified that the odd bits are at current pos and even 2130 * bits at len + current pos 2131 */ 2132 u_long * 2133 mfmblkdecode(rp, dp, cp, len) 2134 u_long *rp, *dp, *cp; 2135 int len; 2136 { 2137 u_long o, e; 2138 int cnt; 2139 2140 cnt = len; 2141 while (cnt--) { 2142 o = *rp; 2143 e = *(rp + len); 2144 if (cp) { 2145 *cp ^= o; 2146 *cp ^= e; 2147 } 2148 o &= 0x55555555; 2149 e &= 0x55555555; 2150 *dp++ = (o << 1) | e; 2151 rp++; 2152 } 2153 if (cp) 2154 *cp &= 0x55555555; 2155 return(rp + len); 2156 } 2157 2158 /* 2159 * decode len words in standard MFM format to len bytes 2160 * of data. 2161 */ 2162 u_short * 2163 msblkdecode(rp, cp, len) 2164 u_short *rp; 2165 u_char *cp; 2166 int len; 2167 { 2168 while (len--) { 2169 *cp++ = msdecode[*rp & 0x7f] | 2170 (msdecode[(*rp >> 8) & 0x7f] << 4); 2171 rp++; 2172 } 2173 2174 return(rp); 2175 } 2176 2177 /* 2178 * encode len bytes of data into len words in standard MFM format. 2179 * If a pointer is supplied for crc, calculate the CRC-16 of the data 2180 * as well. 2181 */ 2182 u_short * 2183 msblkencode(rp, cp, len, crc) 2184 u_short *rp; 2185 u_char *cp; 2186 int len; 2187 u_short *crc; 2188 { 2189 u_short td; 2190 u_short mycrc; 2191 2192 /* preload crc for header (4 bytes) 2193 * or data (anything else) 2194 */ 2195 mycrc = (len == 4) ? 0xb230 : 0xe295; 2196 2197 while (len--) { 2198 td = (msencode[*cp >> 4] << 8) | msencode[*cp & 0x0f]; 2199 2200 /* Check for zeros in top bit of encode and bottom 2201 * bit of previous encode. if so, slap a one in betweem 2202 * them. 2203 */ 2204 if ((td & 0x140) == 0) 2205 td |= 0x80; 2206 if ((td & 0x4000) == 0 && (rp[-1] & 1) == 0) 2207 td |= 0x8000; 2208 2209 *rp++ = td; 2210 2211 /* 2212 * calc crc if requested 2213 */ 2214 if (crc) 2215 mycrc = (mycrc << 8) ^ mscrctab[*cp ^ (mycrc >> 8)]; 2216 2217 cp++; 2218 } 2219 2220 if (crc) 2221 *crc = mycrc; 2222 2223 return(rp); 2224 } 2225 2226 int 2227 fddump(dev, blkno, va, size) 2228 dev_t dev; 2229 daddr_t blkno; 2230 caddr_t va; 2231 size_t size; 2232 { 2233 return (EINVAL); 2234 } 2235