1 /* $NetBSD: fd.c,v 1.62 2003/07/14 15:57:39 aymeric 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 35 #include <sys/cdefs.h> 36 __KERNEL_RCSID(0, "$NetBSD: fd.c,v 1.62 2003/07/14 15:57:39 aymeric Exp $"); 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/callout.h> 41 #include <sys/kernel.h> 42 #include <sys/malloc.h> 43 #include <sys/buf.h> 44 #include <sys/device.h> 45 #include <sys/ioctl.h> 46 #include <sys/fcntl.h> 47 #include <sys/disklabel.h> 48 #include <sys/disk.h> 49 #include <sys/dkbad.h> 50 #include <sys/proc.h> 51 #include <sys/conf.h> 52 53 #include <uvm/uvm_extern.h> 54 55 #include <machine/cpu.h> 56 #include <amiga/amiga/device.h> 57 #include <amiga/amiga/custom.h> 58 #include <amiga/amiga/cia.h> 59 #include <amiga/amiga/cc.h> 60 61 #include "locators.h" 62 63 enum fdc_bits { FDB_CHANGED = 2, FDB_PROTECT, FDB_CYLZERO, FDB_READY }; 64 /* 65 * partitions in fd represent different format floppies 66 * partition a is 0 etc.. 67 */ 68 enum fd_parttypes { 69 FDAMIGAPART = 0, 70 FDMSDOSPART, 71 FDMAXPARTS 72 }; 73 74 #define FDBBSIZE (8192) 75 #define FDSBSIZE (8192) 76 77 #define FDUNIT(dev) DISKUNIT(dev) 78 #define FDPART(dev) DISKPART(dev) 79 #define FDMAKEDEV(m, u, p) MAKEDISKDEV((m), (u), (p)) 80 81 /* that's nice, but we don't want to always use this as an amiga drive 82 bunghole :-) */ 83 #define FDNHEADS (2) /* amiga drives always have 2 heads */ 84 #define FDSECSIZE (512) /* amiga drives always have 512 byte sectors */ 85 #define FDSECLWORDS (128) 86 87 #define FDSETTLEDELAY (18000) /* usec delay after seeking after switch dir */ 88 #define FDSTEPDELAY (3500) /* usec delay after steping */ 89 #define FDPRESIDEDELAY (1000) /* usec delay before writing can occur */ 90 #define FDWRITEDELAY (1300) /* usec delay after write */ 91 92 #define FDSTEPOUT (1) /* decrease track step */ 93 #define FDSTEPIN (0) /* increase track step */ 94 95 #define FDCUNITMASK (0x78) /* mask for all units (bits 6-3) */ 96 97 #define FDRETRIES (2) /* default number of retries */ 98 #define FDMAXUNITS (4) /* maximum number of supported units */ 99 100 #define DISKLEN_READ (0) /* fake mask for reading */ 101 #define DISKLEN_WRITE (1 << 14) /* bit for writing */ 102 #define DISKLEN_DMAEN (1 << 15) /* DMA go */ 103 #define DMABUFSZ ((DISKLEN_WRITE - 1) * 2) /* largest DMA possible */ 104 105 #define FDMFMSYNC (0x4489) 106 #define FDMFMID (0x5554) 107 #define FDMFMDATA (0x5545) 108 #define FDMFMGAP1 (0x9254) 109 #define FDMFMGAP2 (0xAAAA) 110 #define FDMFMGAP3 (0x9254) 111 #define CRC16POLY (0x1021) /* (x^16) + x^12 + x^5 + x^0 */ 112 113 /* 114 * Msdos-type MFM encode/decode 115 */ 116 static u_char msdecode[128]; 117 static u_char msencode[16] = 118 { 119 0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15, 120 0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55 121 }; 122 static u_short mscrctab[256]; 123 124 /* 125 5554 aaaa aaaa aaa5 2aa4 4452 aa51 126 00 00 03 02 ac 0d 127 */ 128 129 /* 130 * floppy device type 131 */ 132 struct fdtype { 133 u_int driveid; /* drive identification (from drive) */ 134 u_int ncylinders; /* number of cylinders on drive */ 135 u_int amiga_nsectors; /* number of sectors per amiga track */ 136 u_int msdos_nsectors; /* number of sectors per msdos track */ 137 u_int nreadw; /* number of words (short) read per track */ 138 u_int nwritew; /* number of words (short) written per track */ 139 u_int gap; /* track gap size in long words */ 140 u_int precomp[2]; /* 1st and 2nd precomp values */ 141 char *desc; /* description of drive type (useq) */ 142 }; 143 144 /* 145 * floppy disk device data 146 */ 147 struct fd_softc { 148 struct device sc_dv; /* generic device info; must come first */ 149 struct disk dkdev; /* generic disk info */ 150 struct bufq_state bufq; /* queue pending I/O operations */ 151 struct buf curbuf; /* state of current I/O operation */ 152 struct callout calibrate_ch; 153 struct callout motor_ch; 154 struct fdtype *type; 155 void *cachep; /* cached track data (write through) */ 156 int cachetrk; /* cahced track -1 for none */ 157 int hwunit; /* unit for amiga controlling hw */ 158 int unitmask; /* mask for cia select deslect */ 159 int pstepdir; /* previous step direction */ 160 int curcyl; /* current curcyl head positioned on */ 161 int flags; /* misc flags */ 162 int wlabel; 163 int stepdelay; /* useq to delay after seek user setable */ 164 int nsectors; /* number of sectors per track */ 165 int openpart; /* which partition [ab] == [12] is open */ 166 short retries; /* number of times to retry failed io */ 167 short retried; /* number of times current io retried */ 168 int bytespersec; /* number of bytes per sector */ 169 }; 170 171 /* fd_softc->flags */ 172 #define FDF_MOTORON (0x01) /* motor is running */ 173 #define FDF_MOTOROFF (0x02) /* motor is waiting to be turned off */ 174 #define FDF_WMOTOROFF (0x04) /* unit wants a wakeup after off */ 175 #define FDF_DIRTY (0x08) /* track cache needs write */ 176 #define FDF_WRITEWAIT (0x10) /* need to head select delay on next setpos */ 177 #define FDF_HAVELABEL (0x20) /* label is valid */ 178 #define FDF_JUSTFLUSH (0x40) /* don't bother caching track. */ 179 #define FDF_NOTRACK0 (0x80) /* was not able to recalibrate drive */ 180 181 int fdc_wantwakeup; 182 int fdc_side; 183 void *fdc_dmap; 184 struct fd_softc *fdc_indma; 185 int fdc_dmalen; 186 int fdc_dmawrite; 187 188 struct fdcargs { 189 struct fdtype *type; 190 int unit; 191 }; 192 193 int fdcmatch(struct device *, struct cfdata *, void *); 194 void fdcattach(struct device *, struct device *, void *); 195 int fdcprint(void *, const char *); 196 int fdmatch(struct device *, struct cfdata *, void *); 197 void fdattach(struct device *, struct device *, void *); 198 199 void fdintr(int); 200 void fdidxintr(void); 201 int fdloaddisk(struct fd_softc *); 202 void fdgetdefaultlabel(struct fd_softc *, struct disklabel *, int); 203 int fdgetdisklabel(struct fd_softc *, dev_t); 204 int fdsetdisklabel(struct fd_softc *, struct disklabel *); 205 int fdputdisklabel(struct fd_softc *, dev_t); 206 struct fdtype * fdcgetfdtype(int); 207 void fdmotoroff(void *); 208 void fdsetpos(struct fd_softc *, int, int); 209 void fdselunit(struct fd_softc *); 210 void fdstart(struct fd_softc *); 211 void fdcont(struct fd_softc *); 212 void fddmastart(struct fd_softc *, int); 213 void fdcalibrate(void *); 214 void fddmadone(struct fd_softc *, int); 215 void fddone(struct fd_softc *); 216 void fdfindwork(int); 217 void fdminphys(struct buf *); 218 void fdcachetoraw(struct fd_softc *); 219 void amcachetoraw(struct fd_softc *); 220 int amrawtocache(struct fd_softc *); 221 u_long *fdfindsync(u_long *, u_long *); 222 int fdrawtocache(struct fd_softc *); 223 void mscachetoraw(struct fd_softc *); 224 int msrawtocache(struct fd_softc *); 225 u_long *mfmblkencode(u_long *, u_long *, u_long *, int); 226 u_long *mfmblkdecode(u_long *, u_long *, u_long *, int); 227 u_short *msblkdecode(u_short *, u_char *, int); 228 u_short *msblkencode(u_short *, u_char *, int, u_short *); 229 230 /* 231 * read size is (nsectors + 1) * mfm secsize + gap bytes + 2 shorts 232 * write size is nsectors * mfm secsize + gap bytes + 3 shorts 233 * the extra shorts are to deal with a DMA hw bug in the controller 234 * they are probably too much (I belive the bug is 1 short on write and 235 * 3 bits on read) but there is no need to be cheap here. 236 */ 237 #define MAXTRKSZ (22 * FDSECSIZE) 238 struct fdtype fdtype[] = { 239 { 0x00000000, 80, 11, 9, 7358, 6815, 414, { 80, 161 }, "3.5dd" }, 240 { 0x55555555, 40, 11, 9, 7358, 6815, 414, { 80, 161 }, "5.25dd" }, 241 { 0xAAAAAAAA, 80, 22, 18, 14716, 13630, 828, { 80, 161 }, "3.5hd" } 242 }; 243 int nfdtype = sizeof(fdtype) / sizeof(*fdtype); 244 245 CFATTACH_DECL(fd, sizeof(struct fd_softc), 246 fdmatch, fdattach, NULL, NULL); 247 248 extern struct cfdriver fd_cd; 249 250 dev_type_open(fdopen); 251 dev_type_close(fdclose); 252 dev_type_read(fdread); 253 dev_type_write(fdwrite); 254 dev_type_ioctl(fdioctl); 255 dev_type_strategy(fdstrategy); 256 257 const struct bdevsw fd_bdevsw = { 258 fdopen, fdclose, fdstrategy, fdioctl, nodump, nosize, D_DISK 259 }; 260 261 const struct cdevsw fd_cdevsw = { 262 fdopen, fdclose, fdread, fdwrite, fdioctl, 263 nostop, notty, nopoll, nommap, nokqfilter, D_DISK 264 }; 265 266 struct dkdriver fddkdriver = { fdstrategy }; 267 268 CFATTACH_DECL(fdc, sizeof(struct device), 269 fdcmatch, fdcattach, NULL, NULL); 270 271 /* 272 * all hw access through macros, this helps to hide the active low 273 * properties 274 */ 275 276 #define FDUNITMASK(unit) (1 << (3 + (unit))) 277 278 /* 279 * select units using mask 280 */ 281 #define FDSELECT(um) do { ciab.prb &= ~(um); } while (0) 282 283 /* 284 * deselect units using mask 285 */ 286 #define FDDESELECT(um) do { ciab.prb |= (um); delay(1); } while (0) 287 288 /* 289 * test hw condition bits 290 */ 291 #define FDTESTC(bit) ((ciaa.pra & (1 << (bit))) == 0) 292 293 /* 294 * set motor for select units, true motor on else off 295 */ 296 #define FDSETMOTOR(on) do { \ 297 if (on) ciab.prb &= ~CIAB_PRB_MTR; else ciab.prb |= CIAB_PRB_MTR; \ 298 } while (0) 299 300 /* 301 * set head for select units 302 */ 303 #define FDSETHEAD(head) do { \ 304 if (head) ciab.prb &= ~CIAB_PRB_SIDE; else ciab.prb |= CIAB_PRB_SIDE; \ 305 delay(1); } while (0) 306 307 /* 308 * select direction, true towards spindle else outwards 309 */ 310 #define FDSETDIR(in) do { \ 311 if (in) ciab.prb &= ~CIAB_PRB_DIR; else ciab.prb |= CIAB_PRB_DIR; \ 312 delay(1); } while (0) 313 314 /* 315 * step the selected units 316 */ 317 #define FDSTEP do { \ 318 ciab.prb &= ~CIAB_PRB_STEP; ciab.prb |= CIAB_PRB_STEP; \ 319 } while (0) 320 321 #define FDDMASTART(len, towrite) do { \ 322 int dmasz = (len) | ((towrite) ? DISKLEN_WRITE : 0) | DISKLEN_DMAEN; \ 323 custom.dsklen = dmasz; custom.dsklen = dmasz; } while (0) 324 325 #define FDDMASTOP do { custom.dsklen = 0; } while (0) 326 327 328 int 329 fdcmatch(struct device *pdp, struct cfdata *cfp, void *auxp) 330 { 331 static int fdc_matched = 0; 332 333 /* Allow only once instance. */ 334 if (matchname("fdc", auxp) == 0 || fdc_matched) 335 return(0); 336 if ((fdc_dmap = alloc_chipmem(DMABUFSZ)) == NULL) { 337 printf("fdc: unable to allocate DMA buffer\n"); 338 return(0); 339 } 340 341 fdc_matched = 1; 342 return(1); 343 } 344 345 void 346 fdcattach(struct device *pdp, struct device *dp, void *auxp) 347 { 348 struct fdcargs args; 349 350 printf(": dmabuf pa 0x%x", kvtop(fdc_dmap)); 351 printf(": dmabuf ka %p\n", fdc_dmap); 352 args.unit = 0; 353 args.type = fdcgetfdtype(args.unit); 354 355 fdc_side = -1; 356 config_found(dp, &args, fdcprint); 357 for (args.unit++; args.unit < FDMAXUNITS; args.unit++) { 358 if ((args.type = fdcgetfdtype(args.unit)) == NULL) 359 continue; 360 config_found(dp, &args, fdcprint); 361 } 362 } 363 364 int 365 fdcprint(void *auxp, const char *pnp) 366 { 367 struct fdcargs *fcp; 368 369 fcp = auxp; 370 if (pnp) 371 aprint_normal("fd%d at %s unit %d:", fcp->unit, pnp, 372 fcp->type->driveid); 373 return(UNCONF); 374 } 375 376 /*ARGSUSED*/ 377 int 378 fdmatch(struct device *pdp, struct cfdata *cfp, void *auxp) 379 { 380 struct fdcargs *fdap; 381 382 fdap = auxp; 383 if (cfp->cf_loc[FDCCF_UNIT] == fdap->unit || 384 cfp->cf_loc[FDCCF_UNIT] == FDCCF_UNIT_DEFAULT) 385 return(1); 386 387 return(0); 388 } 389 390 void 391 fdattach(struct device *pdp, struct device *dp, void *auxp) 392 { 393 struct fdcargs *ap; 394 struct fd_softc *sc; 395 int i; 396 397 ap = auxp; 398 sc = (struct fd_softc *)dp; 399 400 bufq_alloc(&sc->bufq, BUFQ_DISKSORT|BUFQ_SORT_CYLINDER); 401 callout_init(&sc->calibrate_ch); 402 callout_init(&sc->motor_ch); 403 404 sc->curcyl = sc->cachetrk = -1; 405 sc->openpart = -1; 406 sc->type = ap->type; 407 sc->hwunit = ap->unit; 408 sc->unitmask = 1 << (3 + ap->unit); 409 sc->retries = FDRETRIES; 410 sc->stepdelay = FDSTEPDELAY; 411 sc->bytespersec = 512; 412 printf(" unit %d: %s %d cyl, %d head, %d sec [%d sec], 512 bytes/sec\n", 413 sc->hwunit, sc->type->desc, sc->type->ncylinders, FDNHEADS, 414 sc->type->amiga_nsectors, sc->type->msdos_nsectors); 415 416 /* 417 * Initialize and attach the disk structure. 418 */ 419 sc->dkdev.dk_name = sc->sc_dv.dv_xname; 420 sc->dkdev.dk_driver = &fddkdriver; 421 disk_attach(&sc->dkdev); 422 423 /* 424 * calibrate the drive 425 */ 426 fdsetpos(sc, 0, 0); 427 fdsetpos(sc, sc->type->ncylinders, 0); 428 fdsetpos(sc, 0, 0); 429 fdmotoroff(sc); 430 431 /* 432 * precalc msdos MFM and CRC 433 */ 434 for (i = 0; i < 128; i++) 435 msdecode[i] = 0xff; 436 for (i = 0; i < 16; i++) 437 msdecode[msencode[i]] = i; 438 for (i = 0; i < 256; i++) { 439 mscrctab[i] = (0x1021 * (i & 0xf0)) ^ (0x1021 * (i & 0x0f)) ^ 440 (0x1021 * (i >> 4)); 441 } 442 443 /* 444 * enable disk related interrupts 445 */ 446 custom.dmacon = DMAF_SETCLR | DMAF_MASTER | DMAF_DISK; 447 custom.intena = INTF_SETCLR | INTF_DSKBLK; 448 ciab.icr = CIA_ICR_FLG; 449 } 450 451 /*ARGSUSED*/ 452 int 453 fdopen(dev_t dev, int flags, int devtype, struct proc *p) 454 { 455 struct fd_softc *sc; 456 int wasopen, fwork, error, s; 457 458 error = 0; 459 460 if (FDPART(dev) >= FDMAXPARTS) 461 return(ENXIO); 462 463 if ((sc = getsoftc(fd_cd, FDUNIT(dev))) == NULL) 464 return(ENXIO); 465 if (sc->flags & FDF_NOTRACK0) 466 return(ENXIO); 467 if (sc->cachep == NULL) 468 sc->cachep = malloc(MAXTRKSZ, M_DEVBUF, M_WAITOK); 469 470 s = splbio(); 471 /* 472 * if we are sleeping in fdclose(); waiting for a chance to 473 * shut the motor off, do a sleep here also. 474 */ 475 while (sc->flags & FDF_WMOTOROFF) 476 tsleep(fdmotoroff, PRIBIO, "fdopen", 0); 477 478 fwork = 0; 479 /* 480 * if not open let user open request type, otherwise 481 * ensure they are trying to open same type. 482 */ 483 if (sc->openpart == FDPART(dev)) 484 wasopen = 1; 485 else if (sc->openpart == -1) { 486 sc->openpart = FDPART(dev); 487 wasopen = 0; 488 } else { 489 wasopen = 1; 490 error = EPERM; 491 goto done; 492 } 493 494 /* 495 * wait for current io to complete if any 496 */ 497 if (fdc_indma) { 498 fwork = 1; 499 fdc_wantwakeup++; 500 tsleep(fdopen, PRIBIO, "fdopen", 0); 501 } 502 if ((error = fdloaddisk(sc)) != 0) 503 goto done; 504 if ((error = fdgetdisklabel(sc, dev)) != 0) 505 goto done; 506 #ifdef FDDEBUG 507 printf(" open successful\n"); 508 #endif 509 done: 510 /* 511 * if we requested that fddone()->fdfindwork() wake us, allow it to 512 * complete its job now 513 */ 514 if (fwork) 515 fdfindwork(FDUNIT(dev)); 516 splx(s); 517 518 /* 519 * if we were not open and we marked us so reverse that. 520 */ 521 if (error && wasopen == 0) 522 sc->openpart = -1; 523 return(error); 524 } 525 526 /*ARGSUSED*/ 527 int 528 fdclose(dev_t dev, int flags, int devtype, 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_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p) 551 { 552 struct fd_softc *sc; 553 int error, wlab; 554 555 sc = getsoftc(fd_cd, FDUNIT(dev)); 556 557 if ((sc->flags & FDF_HAVELABEL) == 0) 558 return(EBADF); 559 560 switch (cmd) { 561 case DIOCSBAD: 562 return(EINVAL); 563 case DIOCSRETRIES: 564 if (*(int *)addr < 0) 565 return(EINVAL); 566 sc->retries = *(int *)addr; 567 return(0); 568 case DIOCSSTEP: 569 if (*(int *)addr < FDSTEPDELAY) 570 return(EINVAL); 571 sc->dkdev.dk_label->d_trkseek = sc->stepdelay = *(int *)addr; 572 return(0); 573 case DIOCGDINFO: 574 *(struct disklabel *)addr = *(sc->dkdev.dk_label); 575 return(0); 576 case DIOCGPART: 577 ((struct partinfo *)addr)->disklab = sc->dkdev.dk_label; 578 ((struct partinfo *)addr)->part = 579 &sc->dkdev.dk_label->d_partitions[FDPART(dev)]; 580 return(0); 581 case DIOCSDINFO: 582 if ((flag & FWRITE) == 0) 583 return(EBADF); 584 return(fdsetdisklabel(sc, (struct disklabel *)addr)); 585 case DIOCWDINFO: 586 if ((flag & FWRITE) == 0) 587 return(EBADF); 588 if ((error = fdsetdisklabel(sc, (struct disklabel *)addr)) != 0) 589 return(error); 590 wlab = sc->wlabel; 591 sc->wlabel = 1; 592 error = fdputdisklabel(sc, dev); 593 sc->wlabel = wlab; 594 return(error); 595 case DIOCWLABEL: 596 if ((flag & FWRITE) == 0) 597 return(EBADF); 598 sc->wlabel = *(int *)addr; 599 return(0); 600 case DIOCGDEFLABEL: 601 fdgetdefaultlabel(sc, (struct disklabel *)addr, FDPART(dev)); 602 return(0); 603 default: 604 return(ENOTTY); 605 } 606 } 607 608 int 609 fdread(dev_t dev, struct uio *uio, int flags) 610 { 611 return (physio(fdstrategy, NULL, dev, B_READ, fdminphys, uio)); 612 } 613 614 int 615 fdwrite(dev_t dev, struct uio *uio, int flags) 616 { 617 return (physio(fdstrategy, NULL, dev, B_WRITE, fdminphys, uio)); 618 } 619 620 621 void 622 fdintr(int flag) 623 { 624 int s; 625 626 s = splbio(); 627 if (fdc_indma) 628 fddmadone(fdc_indma, 0); 629 splx(s); 630 } 631 632 void 633 fdidxintr(void) 634 { 635 if (fdc_indma && fdc_dmalen) { 636 /* 637 * turn off intr and start actual dma 638 */ 639 ciab.icr = CIA_ICR_FLG; 640 FDDMASTART(fdc_dmalen, fdc_dmawrite); 641 fdc_dmalen = 0; 642 } 643 } 644 645 void 646 fdstrategy(struct buf *bp) 647 { 648 struct disklabel *lp; 649 struct fd_softc *sc; 650 int unit, part, s; 651 652 unit = FDUNIT(bp->b_dev); 653 part = FDPART(bp->b_dev); 654 sc = getsoftc(fd_cd, unit); 655 656 #ifdef FDDEBUG 657 printf("fdstrategy: %p\n", bp); 658 #endif 659 /* 660 * check for valid partition and bounds 661 */ 662 lp = sc->dkdev.dk_label; 663 if ((sc->flags & FDF_HAVELABEL) == 0) { 664 bp->b_error = EIO; 665 goto bad; 666 } 667 if (bounds_check_with_label(&sc->dkdev, bp, sc->wlabel) <= 0) 668 goto done; 669 670 /* 671 * trans count of zero or bounds check indicates io is done 672 * we are done. 673 */ 674 if (bp->b_bcount == 0) 675 goto done; 676 677 bp->b_rawblkno = bp->b_blkno; 678 679 /* 680 * queue the buf and kick the low level code 681 */ 682 s = splbio(); 683 BUFQ_PUT(&sc->bufq, bp); 684 fdstart(sc); 685 splx(s); 686 return; 687 bad: 688 bp->b_flags |= B_ERROR; 689 done: 690 bp->b_resid = bp->b_bcount; 691 biodone(bp); 692 } 693 694 /* 695 * make sure disk is loaded and label is up-to-date. 696 */ 697 int 698 fdloaddisk(struct fd_softc *sc) 699 { 700 /* 701 * if diskchange is low step drive to 0 then up one then to zero. 702 */ 703 fdselunit(sc); /* make sure the unit is selected */ 704 if (FDTESTC(FDB_CHANGED)) { 705 fdsetpos(sc, 0, 0); 706 sc->cachetrk = -1; /* invalidate the cache */ 707 sc->flags &= ~FDF_HAVELABEL; 708 fdsetpos(sc, FDNHEADS, 0); 709 fdsetpos(sc, 0, 0); 710 if (FDTESTC(FDB_CHANGED)) { 711 fdmotoroff(sc); 712 FDDESELECT(sc->unitmask); 713 return(ENXIO); 714 } 715 } 716 FDDESELECT(sc->unitmask); 717 fdmotoroff(sc); 718 sc->type = fdcgetfdtype(sc->hwunit); 719 if (sc->type == NULL) 720 return(ENXIO); 721 if (sc->openpart == FDMSDOSPART) 722 sc->nsectors = sc->type->msdos_nsectors; 723 else 724 sc->nsectors = sc->type->amiga_nsectors; 725 return(0); 726 } 727 728 void 729 fdgetdefaultlabel(struct fd_softc *sc, struct disklabel *lp, int part) 730 /* (variable part) XXX ick */ 731 { 732 733 bzero(lp, sizeof(struct disklabel)); 734 lp->d_secsize = FDSECSIZE; 735 lp->d_ntracks = FDNHEADS; 736 lp->d_ncylinders = sc->type->ncylinders; 737 lp->d_nsectors = sc->nsectors; 738 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 739 lp->d_type = DTYPE_FLOPPY; 740 lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders; 741 lp->d_rpm = 300; /* good guess I suppose. */ 742 lp->d_interleave = 1; /* should change when adding msdos */ 743 sc->stepdelay = lp->d_trkseek = FDSTEPDELAY; 744 lp->d_bbsize = 0; 745 lp->d_sbsize = 0; 746 lp->d_partitions[part].p_size = lp->d_secperunit; 747 lp->d_partitions[part].p_fstype = FS_UNUSED; 748 lp->d_partitions[part].p_fsize = 1024; 749 lp->d_partitions[part].p_frag = 8; 750 lp->d_partitions[part].p_cpg = 2; /* adosfs: reserved blocks */ 751 lp->d_npartitions = part + 1; 752 lp->d_magic = lp->d_magic2 = DISKMAGIC; 753 lp->d_checksum = dkcksum(lp); 754 } 755 756 /* 757 * read disk label, if present otherwise create one 758 * return a new label if raw part and none found, otherwise err. 759 */ 760 int 761 fdgetdisklabel(struct fd_softc *sc, dev_t dev) 762 { 763 struct disklabel *lp, *dlp; 764 struct cpu_disklabel *clp; 765 struct buf *bp; 766 int error, part; 767 768 if (sc->flags & FDF_HAVELABEL && 769 sc->dkdev.dk_label->d_npartitions == (FDPART(dev) + 1)) 770 return(0); 771 #ifdef FDDEBUG 772 printf("fdgetdisklabel()\n"); 773 #endif 774 part = FDPART(dev); 775 lp = sc->dkdev.dk_label; 776 clp = sc->dkdev.dk_cpulabel; 777 bzero(lp, sizeof(struct disklabel)); 778 bzero(clp, sizeof(struct cpu_disklabel)); 779 780 lp->d_secsize = FDSECSIZE; 781 lp->d_ntracks = FDNHEADS; 782 lp->d_ncylinders = sc->type->ncylinders; 783 lp->d_nsectors = sc->nsectors; 784 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 785 lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders; 786 lp->d_npartitions = part + 1; 787 lp->d_partitions[part].p_size = lp->d_secperunit; 788 lp->d_partitions[part].p_fstype = FS_UNUSED; 789 lp->d_partitions[part].p_fsize = 1024; 790 lp->d_partitions[part].p_frag = 8; 791 lp->d_partitions[part].p_cpg = 2; /* for adosfs: reserved blks */ 792 793 sc->flags |= FDF_HAVELABEL; 794 795 bp = (void *)geteblk((int)lp->d_secsize); 796 bp->b_dev = dev; 797 bp->b_blkno = 0; 798 bp->b_cylinder = 0; 799 bp->b_bcount = FDSECSIZE; 800 bp->b_flags |= B_READ; 801 fdstrategy(bp); 802 if ((error = biowait(bp)) != 0) 803 goto nolabel; 804 dlp = (struct disklabel *)(bp->b_data + LABELOFFSET); 805 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC || 806 dkcksum(dlp)) { 807 error = EINVAL; 808 goto nolabel; 809 } 810 bcopy(dlp, lp, sizeof(struct disklabel)); 811 if (lp->d_trkseek > FDSTEPDELAY) 812 sc->stepdelay = lp->d_trkseek; 813 brelse(bp); 814 return(0); 815 nolabel: 816 fdgetdefaultlabel(sc, lp, part); 817 brelse(bp); 818 return(0); 819 } 820 821 /* 822 * set the incore copy of this units disklabel 823 */ 824 int 825 fdsetdisklabel(struct fd_softc *sc, struct disklabel *lp) 826 { 827 struct disklabel *clp; 828 struct partition *pp; 829 830 /* 831 * must have at least opened raw unit to fetch the 832 * raw_part stuff. 833 */ 834 if ((sc->flags & FDF_HAVELABEL) == 0) 835 return(EINVAL); 836 clp = sc->dkdev.dk_label; 837 /* 838 * make sure things check out and we only have one valid 839 * partition 840 */ 841 #ifdef FDDEBUG 842 printf("fdsetdisklabel\n"); 843 #endif 844 if (lp->d_secsize != FDSECSIZE || 845 lp->d_nsectors != clp->d_nsectors || 846 lp->d_ntracks != FDNHEADS || 847 lp->d_ncylinders != clp->d_ncylinders || 848 lp->d_secpercyl != clp->d_secpercyl || 849 lp->d_secperunit != clp->d_secperunit || 850 lp->d_magic != DISKMAGIC || 851 lp->d_magic2 != DISKMAGIC || 852 lp->d_npartitions == 0 || 853 lp->d_npartitions > FDMAXPARTS || 854 (lp->d_partitions[0].p_offset && lp->d_partitions[1].p_offset) || 855 dkcksum(lp)) 856 return(EINVAL); 857 /* 858 * if any partitions are present make sure they 859 * represent the currently open type 860 */ 861 if ((pp = &lp->d_partitions[0])->p_size) { 862 if ((pp = &lp->d_partitions[1])->p_size == 0) 863 goto done; 864 else if (sc->openpart != 1) 865 return(EINVAL); 866 } else if (sc->openpart != 0) 867 return(EINVAL); 868 /* 869 * make sure selected partition is within bounds 870 * XXX on the second check, its to handle a bug in 871 * XXX the cluster routines as they require mutliples 872 * XXX of PAGE_SIZE currently 873 */ 874 if ((pp->p_offset + pp->p_size >= lp->d_secperunit) || 875 (pp->p_frag * pp->p_fsize % PAGE_SIZE)) 876 return(EINVAL); 877 done: 878 bcopy(lp, clp, sizeof(struct disklabel)); 879 return(0); 880 } 881 882 /* 883 * write out the incore copy of this units disklabel 884 */ 885 int 886 fdputdisklabel(struct fd_softc *sc, dev_t dev) 887 { 888 struct disklabel *lp, *dlp; 889 struct buf *bp; 890 int error; 891 892 if ((sc->flags & FDF_HAVELABEL) == 0) 893 return(EBADF); 894 #ifdef FDDEBUG 895 printf("fdputdisklabel\n"); 896 #endif 897 /* 898 * get buf and read in sector 0 899 */ 900 lp = sc->dkdev.dk_label; 901 bp = geteblk((int)lp->d_secsize); 902 bp->b_dev = FDMAKEDEV(major(dev), FDUNIT(dev), RAW_PART); 903 bp->b_blkno = 0; 904 bp->b_cylinder = 0; 905 bp->b_bcount = FDSECSIZE; 906 bp->b_flags |= B_READ; 907 fdstrategy(bp); 908 if ((error = biowait(bp)) != 0) 909 goto done; 910 /* 911 * copy disklabel to buf and write it out synchronous 912 */ 913 dlp = (struct disklabel *)(bp->b_data + LABELOFFSET); 914 bcopy(lp, dlp, sizeof(struct disklabel)); 915 bp->b_blkno = 0; 916 bp->b_cylinder = 0; 917 bp->b_flags &= ~(B_READ|B_DONE); 918 bp->b_flags |= B_WRITE; 919 fdstrategy(bp); 920 error = biowait(bp); 921 done: 922 brelse(bp); 923 return(error); 924 } 925 926 /* 927 * figure out drive type or NULL if none. 928 */ 929 struct fdtype * 930 fdcgetfdtype(int unit) 931 { 932 struct fdtype *ftp; 933 u_long id, idb; 934 int cnt, umask; 935 936 id = 0; 937 umask = 1 << (3 + unit); 938 939 FDDESELECT(FDCUNITMASK); 940 941 FDSETMOTOR(1); 942 delay(1); 943 FDSELECT(umask); 944 delay(1); 945 FDDESELECT(umask); 946 947 FDSETMOTOR(0); 948 delay(1); 949 FDSELECT(umask); 950 delay(1); 951 FDDESELECT(umask); 952 953 for (idb = 0x80000000; idb; idb >>= 1) { 954 FDSELECT(umask); 955 delay(1); 956 if (FDTESTC(FDB_READY) == 0) 957 id |= idb; 958 FDDESELECT(umask); 959 delay(1); 960 } 961 #ifdef FDDEBUG 962 printf("fdcgettype unit %d id 0x%lx\n", unit, id); 963 #endif 964 965 for (cnt = 0, ftp = fdtype; cnt < nfdtype; ftp++, cnt++) 966 if (ftp->driveid == id) 967 return(ftp); 968 /* 969 * 3.5dd's at unit 0 do not always return id. 970 */ 971 if (unit == 0) 972 return(fdtype); 973 return(NULL); 974 } 975 976 /* 977 * turn motor off if possible otherwise mark as needed and will be done 978 * later. 979 */ 980 void 981 fdmotoroff(void *arg) 982 { 983 struct fd_softc *sc; 984 int s; 985 986 sc = arg; 987 s = splbio(); 988 989 #ifdef FDDEBUG 990 printf("fdmotoroff: unit %d\n", sc->hwunit); 991 #endif 992 if ((sc->flags & FDF_MOTORON) == 0) 993 goto done; 994 /* 995 * if we have a timeout on a DMA operation let fddmadone() 996 * deal with it. 997 */ 998 if (fdc_indma == sc) { 999 fddmadone(sc, 1); 1000 goto done; 1001 } 1002 #ifdef FDDEBUG 1003 printf(" motor was on, turning off\n"); 1004 #endif 1005 1006 /* 1007 * flush cache if needed 1008 */ 1009 if (sc->flags & FDF_DIRTY) { 1010 sc->flags |= FDF_JUSTFLUSH | FDF_MOTOROFF; 1011 #ifdef FDDEBUG 1012 printf(" flushing dirty buffer first\n"); 1013 #endif 1014 /* 1015 * if DMA'ing done for now, fddone() will call us again 1016 */ 1017 if (fdc_indma) 1018 goto done; 1019 fddmastart(sc, sc->cachetrk); 1020 goto done; 1021 } 1022 1023 /* 1024 * if controller is busy just schedule us to be called back 1025 */ 1026 if (fdc_indma) { 1027 /* 1028 * someone else has the controller now 1029 * just set flag and let fddone() call us again. 1030 */ 1031 sc->flags |= FDF_MOTOROFF; 1032 goto done; 1033 } 1034 1035 #ifdef FDDEBUG 1036 printf(" hw turning unit off\n"); 1037 #endif 1038 1039 sc->flags &= ~(FDF_MOTORON | FDF_MOTOROFF); 1040 FDDESELECT(FDCUNITMASK); 1041 FDSETMOTOR(0); 1042 delay(1); 1043 FDSELECT(sc->unitmask); 1044 delay(4); 1045 FDDESELECT(sc->unitmask); 1046 delay(1); 1047 if (sc->flags & FDF_WMOTOROFF) 1048 wakeup(fdmotoroff); 1049 done: 1050 splx(s); 1051 } 1052 1053 /* 1054 * select drive seek to track exit with motor on. 1055 * fdsetpos(x, 0, 0) does calibrates the drive. 1056 */ 1057 void 1058 fdsetpos(struct fd_softc *sc, int trk, int towrite) 1059 { 1060 int nstep, sdir, ondly, ncyl, nside; 1061 1062 FDDESELECT(FDCUNITMASK); 1063 FDSETMOTOR(1); 1064 delay(1); 1065 FDSELECT(sc->unitmask); 1066 delay(1); 1067 if ((sc->flags & FDF_MOTORON) == 0) { 1068 ondly = 0; 1069 while (FDTESTC(FDB_READY) == 0) { 1070 delay(1000); 1071 if (++ondly >= 1000) 1072 break; 1073 } 1074 } 1075 sc->flags |= FDF_MOTORON; 1076 1077 ncyl = trk / FDNHEADS; 1078 nside = trk % FDNHEADS; 1079 1080 if (sc->curcyl == ncyl && fdc_side == nside) 1081 return; 1082 1083 if (towrite) 1084 sc->flags |= FDF_WRITEWAIT; 1085 1086 #ifdef FDDEBUG 1087 printf("fdsetpos: cyl %d head %d towrite %d\n", trk / FDNHEADS, 1088 trk % FDNHEADS, towrite); 1089 #endif 1090 nstep = ncyl - sc->curcyl; 1091 if (nstep) { 1092 /* 1093 * figure direction 1094 */ 1095 if (nstep > 0 && ncyl != 0) { 1096 sdir = FDSTEPIN; 1097 FDSETDIR(1); 1098 } else { 1099 nstep = -nstep; 1100 sdir = FDSTEPOUT; 1101 FDSETDIR(0); 1102 } 1103 if (ncyl == 0) { 1104 /* 1105 * either just want cylinder 0 or doing 1106 * a calibrate. 1107 */ 1108 nstep = 256; 1109 while (FDTESTC(FDB_CYLZERO) == 0 && nstep--) { 1110 FDSTEP; 1111 delay(sc->stepdelay); 1112 } 1113 if (nstep < 0) 1114 sc->flags |= FDF_NOTRACK0; 1115 } else { 1116 /* 1117 * step the needed amount amount. 1118 */ 1119 while (nstep--) { 1120 FDSTEP; 1121 delay(sc->stepdelay); 1122 } 1123 } 1124 /* 1125 * if switched directions 1126 * allow drive to settle. 1127 */ 1128 if (sc->pstepdir != sdir) 1129 delay(FDSETTLEDELAY); 1130 sc->pstepdir = sdir; 1131 sc->curcyl = ncyl; 1132 } 1133 if (nside == fdc_side) 1134 return; 1135 /* 1136 * select side 1137 */ 1138 fdc_side = nside; 1139 FDSETHEAD(nside); 1140 delay(FDPRESIDEDELAY); 1141 } 1142 1143 void 1144 fdselunit(struct fd_softc *sc) 1145 { 1146 FDDESELECT(FDCUNITMASK); /* deselect all */ 1147 FDSETMOTOR(sc->flags & FDF_MOTORON); /* set motor to unit's state */ 1148 delay(1); 1149 FDSELECT(sc->unitmask); /* select unit */ 1150 delay(1); 1151 } 1152 1153 /* 1154 * process next buf on device queue. 1155 * normall sequence of events: 1156 * fdstart() -> fddmastart(); 1157 * fdidxintr(); 1158 * fdintr() -> fddmadone() -> fddone(); 1159 * if the track is in the cache then fdstart() will short-circuit 1160 * to fddone() else if the track cache is dirty it will flush. If 1161 * the buf is not an entire track it will cache the requested track. 1162 */ 1163 void 1164 fdstart(struct fd_softc *sc) 1165 { 1166 int trk, error, write; 1167 struct buf *bp, *dp; 1168 int changed; 1169 1170 #ifdef FDDEBUG 1171 printf("fdstart: unit %d\n", sc->hwunit); 1172 #endif 1173 1174 /* 1175 * if DMA'ing just return. we must have been called from fdstartegy. 1176 */ 1177 if (fdc_indma) 1178 return; 1179 1180 /* 1181 * get next buf if there. 1182 */ 1183 dp = &sc->curbuf; 1184 if ((bp = BUFQ_PEEK(&sc->bufq)) == NULL) { 1185 #ifdef FDDEBUG 1186 printf(" nothing to do\n"); 1187 #endif 1188 return; 1189 } 1190 1191 /* 1192 * Mark us as busy now, in case fddone() gets called in one 1193 * of the cases below. 1194 */ 1195 disk_busy(&sc->dkdev); 1196 1197 /* 1198 * make sure same disk is loaded 1199 */ 1200 fdselunit(sc); 1201 changed = FDTESTC(FDB_CHANGED); 1202 FDDESELECT(sc->unitmask); 1203 if (changed) { 1204 /* 1205 * disk missing, invalidate all future io on 1206 * this unit until re-open()'ed also invalidate 1207 * all current io 1208 */ 1209 printf("fdstart: disk changed\n"); 1210 #ifdef FDDEBUG 1211 printf(" disk was removed invalidating all io\n"); 1212 #endif 1213 sc->flags &= ~FDF_HAVELABEL; 1214 for (;;) { 1215 bp = BUFQ_GET(&sc->bufq); 1216 bp->b_flags |= B_ERROR; 1217 bp->b_error = EIO; 1218 if (BUFQ_PEEK(&sc->bufq) == NULL) 1219 break; 1220 biodone(bp); 1221 } 1222 /* 1223 * do fddone() on last buf to allow other units to start. 1224 */ 1225 BUFQ_PUT(&sc->bufq, bp); 1226 fddone(sc); 1227 return; 1228 } 1229 1230 /* 1231 * we have a valid buf, setup our local version 1232 * we use this count to allow reading over multiple tracks. 1233 * into a single buffer 1234 */ 1235 dp->b_bcount = bp->b_bcount; 1236 dp->b_blkno = bp->b_blkno; 1237 dp->b_data = bp->b_data; 1238 dp->b_flags = bp->b_flags; 1239 dp->b_resid = 0; 1240 1241 if (bp->b_flags & B_READ) 1242 write = 0; 1243 else if (FDTESTC(FDB_PROTECT) == 0) 1244 write = 1; 1245 else { 1246 error = EPERM; 1247 goto bad; 1248 } 1249 1250 /* 1251 * figure trk given blkno 1252 */ 1253 trk = bp->b_blkno / sc->nsectors; 1254 1255 /* 1256 * check to see if same as currently cached track 1257 * if so we need to do no DMA read. 1258 */ 1259 if (trk == sc->cachetrk) { 1260 fddone(sc); 1261 return; 1262 } 1263 1264 /* 1265 * if we will be overwriting the entire cache, don't bother to 1266 * fetch it. 1267 */ 1268 if (bp->b_bcount == (sc->nsectors * FDSECSIZE) && write && 1269 bp->b_blkno % sc->nsectors == 0) { 1270 if (sc->flags & FDF_DIRTY) 1271 sc->flags |= FDF_JUSTFLUSH; 1272 else { 1273 sc->cachetrk = trk; 1274 fddone(sc); 1275 return; 1276 } 1277 } 1278 1279 /* 1280 * start DMA read of `trk' 1281 */ 1282 fddmastart(sc, trk); 1283 return; 1284 bad: 1285 bp->b_flags |= B_ERROR; 1286 bp->b_error = error; 1287 fddone(sc); 1288 } 1289 1290 /* 1291 * continue a started operation on next track. always begin at 1292 * sector 0 on the next track. 1293 */ 1294 void 1295 fdcont(struct fd_softc *sc) 1296 { 1297 struct buf *dp, *bp; 1298 int trk, write; 1299 1300 dp = &sc->curbuf; 1301 bp = BUFQ_PEEK(&sc->bufq); 1302 dp->b_data += (dp->b_bcount - bp->b_resid); 1303 dp->b_blkno += (dp->b_bcount - bp->b_resid) / FDSECSIZE; 1304 dp->b_bcount = bp->b_resid; 1305 1306 /* 1307 * figure trk given blkno 1308 */ 1309 trk = dp->b_blkno / sc->nsectors; 1310 #ifdef DEBUG 1311 if (trk != sc->cachetrk + 1 || dp->b_blkno % sc->nsectors != 0) 1312 panic("fdcont: confused"); 1313 #endif 1314 if (dp->b_flags & B_READ) 1315 write = 0; 1316 else 1317 write = 1; 1318 /* 1319 * if we will be overwriting the entire cache, don't bother to 1320 * fetch it. 1321 */ 1322 if (dp->b_bcount == (sc->nsectors * FDSECSIZE) && write) { 1323 if (sc->flags & FDF_DIRTY) 1324 sc->flags |= FDF_JUSTFLUSH; 1325 else { 1326 sc->cachetrk = trk; 1327 fddone(sc); 1328 return; 1329 } 1330 } 1331 /* 1332 * start DMA read of `trk' 1333 */ 1334 fddmastart(sc, trk); 1335 return; 1336 } 1337 1338 void 1339 fddmastart(struct fd_softc *sc, int trk) 1340 { 1341 int adkmask, ndmaw, write, dmatrk; 1342 1343 #ifdef FDDEBUG 1344 printf("fddmastart: unit %d cyl %d head %d", sc->hwunit, 1345 trk / FDNHEADS, trk % FDNHEADS); 1346 #endif 1347 /* 1348 * flush the cached track if dirty else read requested track. 1349 */ 1350 if (sc->flags & FDF_DIRTY) { 1351 fdcachetoraw(sc); 1352 ndmaw = sc->type->nwritew; 1353 dmatrk = sc->cachetrk; 1354 write = 1; 1355 } else { 1356 ndmaw = sc->type->nreadw; 1357 dmatrk = trk; 1358 write = 0; 1359 } 1360 1361 #ifdef FDDEBUG 1362 printf(" %s", write ? " flushing cache\n" : " loading cache\n"); 1363 #endif 1364 sc->cachetrk = trk; 1365 fdc_indma = sc; 1366 fdsetpos(sc, dmatrk, write); 1367 1368 /* 1369 * setup dma stuff 1370 */ 1371 if (write == 0) { 1372 custom.adkcon = ADKF_MSBSYNC; 1373 custom.adkcon = ADKF_SETCLR | ADKF_WORDSYNC | ADKF_FAST; 1374 custom.dsksync = FDMFMSYNC; 1375 } else { 1376 custom.adkcon = ADKF_PRECOMP1 | ADKF_PRECOMP0 | ADKF_WORDSYNC | 1377 ADKF_MSBSYNC; 1378 adkmask = ADKF_SETCLR | ADKF_FAST | ADKF_MFMPREC; 1379 if (dmatrk >= sc->type->precomp[0]) 1380 adkmask |= ADKF_PRECOMP0; 1381 if (dmatrk >= sc->type->precomp[1]) 1382 adkmask |= ADKF_PRECOMP1; 1383 custom.adkcon = adkmask; 1384 } 1385 custom.dskpt = (u_char *)kvtop(fdc_dmap); 1386 1387 /* 1388 * If writing an MSDOS track, activate disk index pulse 1389 * interrupt, DMA will be started in the intr routine fdidxintr() 1390 * Otherwise, start the DMA here. 1391 */ 1392 if (write && sc->openpart == FDMSDOSPART) { 1393 fdc_dmalen = ndmaw; 1394 fdc_dmawrite = write; 1395 ciab.icr = CIA_ICR_IR_SC | CIA_ICR_FLG; 1396 } else { 1397 FDDMASTART(ndmaw, write); 1398 fdc_dmalen = 0; 1399 } 1400 1401 #ifdef FDDEBUG 1402 printf(" DMA started\n"); 1403 #endif 1404 } 1405 1406 /* 1407 * recalibrate the drive 1408 */ 1409 void 1410 fdcalibrate(void *arg) 1411 { 1412 struct fd_softc *sc; 1413 static int loopcnt; 1414 1415 sc = arg; 1416 1417 if (loopcnt == 0) { 1418 /* 1419 * seek cyl 0 1420 */ 1421 fdc_indma = sc; 1422 sc->stepdelay += 900; 1423 if (sc->cachetrk > 1) 1424 fdsetpos(sc, sc->cachetrk % FDNHEADS, 0); 1425 sc->stepdelay -= 900; 1426 } 1427 if (loopcnt++ & 1) 1428 fdsetpos(sc, sc->cachetrk, 0); 1429 else 1430 fdsetpos(sc, sc->cachetrk + FDNHEADS, 0); 1431 /* 1432 * trk++, trk, trk++, trk, trk++, trk, trk++, trk and DMA 1433 */ 1434 if (loopcnt < 8) 1435 callout_reset(&sc->calibrate_ch, hz / 8, fdcalibrate, sc); 1436 else { 1437 loopcnt = 0; 1438 fdc_indma = NULL; 1439 callout_reset(&sc->motor_ch, 3 * hz / 2, fdmotoroff, sc); 1440 fddmastart(sc, sc->cachetrk); 1441 } 1442 } 1443 1444 void 1445 fddmadone(struct fd_softc *sc, int timeo) 1446 { 1447 #ifdef FDDEBUG 1448 printf("fddmadone: unit %d, timeo %d\n", sc->hwunit, timeo); 1449 #endif 1450 fdc_indma = NULL; 1451 callout_stop(&sc->motor_ch); 1452 FDDMASTOP; 1453 1454 /* 1455 * guarantee the drive has been at current head and cyl 1456 * for at least FDWRITEDELAY after a write. 1457 */ 1458 if (sc->flags & FDF_WRITEWAIT) { 1459 delay(FDWRITEDELAY); 1460 sc->flags &= ~FDF_WRITEWAIT; 1461 } 1462 1463 if ((sc->flags & FDF_MOTOROFF) == 0) { 1464 /* 1465 * motor runs for 1.5 seconds after last DMA 1466 */ 1467 callout_reset(&sc->motor_ch, 3 * hz / 2, fdmotoroff, sc); 1468 } 1469 if (sc->flags & FDF_DIRTY) { 1470 /* 1471 * if buffer dirty, the last DMA cleaned it 1472 */ 1473 sc->flags &= ~FDF_DIRTY; 1474 if (timeo) 1475 printf("%s: write of track cache timed out.\n", 1476 sc->sc_dv.dv_xname); 1477 if (sc->flags & FDF_JUSTFLUSH) { 1478 sc->flags &= ~FDF_JUSTFLUSH; 1479 /* 1480 * we are done DMA'ing 1481 */ 1482 fddone(sc); 1483 return; 1484 } 1485 /* 1486 * load the cache 1487 */ 1488 fddmastart(sc, sc->cachetrk); 1489 return; 1490 } 1491 #ifdef FDDEBUG 1492 else if (sc->flags & FDF_MOTOROFF) 1493 panic("fddmadone: FDF_MOTOROFF with no FDF_DIRTY"); 1494 #endif 1495 1496 /* 1497 * cache loaded decode it into cache buffer 1498 */ 1499 if (timeo == 0 && fdrawtocache(sc) == 0) 1500 sc->retried = 0; 1501 else { 1502 #ifdef FDDEBUG 1503 if (timeo) 1504 printf("%s: fddmadone: cache load timed out.\n", 1505 sc->sc_dv.dv_xname); 1506 #endif 1507 if (sc->retried >= sc->retries) { 1508 sc->retried = 0; 1509 sc->cachetrk = -1; 1510 } else { 1511 sc->retried++; 1512 /* 1513 * this will be restarted at end of calibrate loop. 1514 */ 1515 callout_stop(&sc->motor_ch); 1516 fdcalibrate(sc); 1517 return; 1518 } 1519 } 1520 fddone(sc); 1521 } 1522 1523 void 1524 fddone(struct fd_softc *sc) 1525 { 1526 struct buf *dp, *bp; 1527 char *data; 1528 int sz; 1529 1530 #ifdef FDDEBUG 1531 printf("fddone: unit %d\n", sc->hwunit); 1532 #endif 1533 /* 1534 * check to see if unit is just flushing the cache, 1535 * that is we have no io queued. 1536 */ 1537 if (sc->flags & FDF_MOTOROFF) 1538 goto nobuf; 1539 1540 dp = &sc->curbuf; 1541 if ((bp = BUFQ_PEEK(&sc->bufq)) == NULL) 1542 panic ("fddone"); 1543 /* 1544 * check for an error that may have occurred 1545 * while getting the track. 1546 */ 1547 if (sc->cachetrk == -1) { 1548 sc->retried = 0; 1549 bp->b_flags |= B_ERROR; 1550 bp->b_error = EIO; 1551 } else if ((bp->b_flags & B_ERROR) == 0) { 1552 data = sc->cachep; 1553 /* 1554 * get offset of data in track cache and limit 1555 * the copy size to not exceed the cache's end. 1556 */ 1557 data += (dp->b_blkno % sc->nsectors) * FDSECSIZE; 1558 sz = sc->nsectors - dp->b_blkno % sc->nsectors; 1559 sz *= FDSECSIZE; 1560 sz = min(dp->b_bcount, sz); 1561 if (bp->b_flags & B_READ) 1562 bcopy(data, dp->b_data, sz); 1563 else { 1564 bcopy(dp->b_data, data, sz); 1565 sc->flags |= FDF_DIRTY; 1566 } 1567 bp->b_resid = dp->b_bcount - sz; 1568 if (bp->b_resid == 0) { 1569 bp->b_error = 0; 1570 } else { 1571 /* 1572 * not done yet need to read next track 1573 */ 1574 fdcont(sc); 1575 return; 1576 } 1577 } 1578 /* 1579 * remove from queue. 1580 */ 1581 (void)BUFQ_GET(&sc->bufq); 1582 1583 disk_unbusy(&sc->dkdev, (bp->b_bcount - bp->b_resid), 1584 (bp->b_flags & B_READ)); 1585 1586 biodone(bp); 1587 nobuf: 1588 fdfindwork(sc->sc_dv.dv_unit); 1589 } 1590 1591 void 1592 fdfindwork(int unit) 1593 { 1594 struct fd_softc *ssc, *sc; 1595 int i, last; 1596 1597 /* 1598 * first see if we have any fdopen()'s waiting 1599 */ 1600 if (fdc_wantwakeup) { 1601 wakeup(fdopen); 1602 fdc_wantwakeup--; 1603 return; 1604 } 1605 1606 /* 1607 * start next available unit, linear search from the next unit 1608 * wrapping and finally this unit. 1609 */ 1610 last = 0; 1611 ssc = NULL; 1612 for (i = unit + 1; last == 0; i++) { 1613 if (i == unit) 1614 last = 1; 1615 if (i >= fd_cd.cd_ndevs) { 1616 i = -1; 1617 continue; 1618 } 1619 if ((sc = fd_cd.cd_devs[i]) == NULL) 1620 continue; 1621 1622 /* 1623 * if unit has requested to be turned off 1624 * and it has no buf's queued do it now 1625 */ 1626 if (sc->flags & FDF_MOTOROFF) { 1627 if (BUFQ_PEEK(&sc->bufq) == NULL) 1628 fdmotoroff(sc); 1629 else { 1630 /* 1631 * we gained a buf request while 1632 * we waited, forget the motoroff 1633 */ 1634 sc->flags &= ~FDF_MOTOROFF; 1635 } 1636 /* 1637 * if we now have DMA unit must have needed 1638 * flushing, quit 1639 */ 1640 if (fdc_indma) 1641 return; 1642 } 1643 /* 1644 * if we have no start unit and the current unit has 1645 * io waiting choose this unit to start. 1646 */ 1647 if (ssc == NULL && BUFQ_PEEK(&sc->bufq) != NULL) 1648 ssc = sc; 1649 } 1650 if (ssc) 1651 fdstart(ssc); 1652 } 1653 1654 /* 1655 * min byte count to whats left of the track in question 1656 */ 1657 void 1658 fdminphys(struct buf *bp) 1659 { 1660 struct fd_softc *sc; 1661 int trk, sec, toff, tsz; 1662 1663 if ((sc = getsoftc(fd_cd, FDUNIT(bp->b_dev))) == NULL) 1664 panic("fdminphys: couldn't get softc"); 1665 1666 trk = bp->b_blkno / sc->nsectors; 1667 sec = bp->b_blkno % sc->nsectors; 1668 1669 toff = sec * FDSECSIZE; 1670 tsz = sc->nsectors * FDSECSIZE; 1671 #ifdef FDDEBUG 1672 printf("fdminphys: before %ld", bp->b_bcount); 1673 #endif 1674 bp->b_bcount = min(bp->b_bcount, tsz - toff); 1675 #ifdef FDDEBUG 1676 printf(" after %ld\n", bp->b_bcount); 1677 #endif 1678 minphys(bp); 1679 } 1680 1681 /* 1682 * encode the track cache into raw MFM ready for DMA 1683 * when we go to multiple disk formats, this will call type dependent 1684 * functions 1685 */ 1686 void fdcachetoraw(struct fd_softc *sc) 1687 { 1688 if (sc->openpart == FDMSDOSPART) 1689 mscachetoraw(sc); 1690 else 1691 amcachetoraw(sc); 1692 } 1693 1694 /* 1695 * decode raw MFM from DMA into units track cache. 1696 * when we go to multiple disk formats, this will call type dependent 1697 * functions 1698 */ 1699 int 1700 fdrawtocache(struct fd_softc *sc) 1701 { 1702 1703 if (sc->openpart == FDMSDOSPART) 1704 return(msrawtocache(sc)); 1705 else 1706 return(amrawtocache(sc)); 1707 } 1708 1709 void 1710 amcachetoraw(struct fd_softc *sc) 1711 { 1712 static u_long mfmnull[4]; 1713 u_long *rp, *crp, *dp, hcksum, dcksum, info, zero; 1714 int sec, i; 1715 1716 rp = fdc_dmap; 1717 1718 /* 1719 * not yet one sector (- 1 long) gap. 1720 * for now use previous drivers values 1721 */ 1722 for (i = 0; i < sc->type->gap; i++) 1723 *rp++ = 0xaaaaaaaa; 1724 /* 1725 * process sectors 1726 */ 1727 dp = sc->cachep; 1728 zero = 0; 1729 info = 0xff000000 | (sc->cachetrk << 16) | sc->nsectors; 1730 for (sec = 0; sec < sc->nsectors; sec++, info += (1 << 8) - 1) { 1731 hcksum = dcksum = 0; 1732 /* 1733 * sector format 1734 * offset description 1735 *----------------------------------- 1736 * 0 null 1737 * 1 sync 1738 * oddbits evenbits 1739 *---------------------- 1740 * 2 3 [0xff]b [trk]b [sec]b [togap]b 1741 * 4-7 8-11 null 1742 * 12 13 header cksum [2-11] 1743 * 14 15 data cksum [16-271] 1744 * 16-143 144-271 data 1745 */ 1746 *rp = 0xaaaaaaaa; 1747 if (*(rp - 1) & 0x1) 1748 *rp &= 0x7fffffff; /* clock bit correction */ 1749 rp++; 1750 *rp++ = (FDMFMSYNC << 16) | FDMFMSYNC; 1751 rp = mfmblkencode(&info, rp, &hcksum, 1); 1752 rp = mfmblkencode(mfmnull, rp, &hcksum, 4); 1753 rp = mfmblkencode(&hcksum, rp, NULL, 1); 1754 1755 crp = rp; 1756 rp = mfmblkencode(dp, rp + 2, &dcksum, FDSECLWORDS); 1757 dp += FDSECLWORDS; 1758 crp = mfmblkencode(&dcksum, crp, NULL, 1); 1759 if (*(crp - 1) & 0x1) 1760 *crp &= 0x7fffffff; /* clock bit correction */ 1761 else if ((*crp & 0x40000000) == 0) 1762 *crp |= 0x80000000; 1763 } 1764 *rp = 0xaaa80000; 1765 if (*(rp - 1) & 0x1) 1766 *rp &= 0x7fffffff; 1767 } 1768 1769 u_long * 1770 fdfindsync(u_long *rp, u_long *ep) 1771 { 1772 u_short *sp; 1773 1774 sp = (u_short *)rp; 1775 while ((u_long *)sp < ep && *sp != FDMFMSYNC) 1776 sp++; 1777 while ((u_long *)sp < ep && *sp == FDMFMSYNC) 1778 sp++; 1779 if ((u_long *)sp < ep) 1780 return((u_long *)sp); 1781 return(NULL); 1782 } 1783 1784 int 1785 amrawtocache(struct fd_softc *sc) 1786 { 1787 u_long mfmnull[4]; 1788 u_long *dp, *rp, *erp, *crp, *srp, hcksum, dcksum, info, cktmp; 1789 int cnt, doagain; 1790 1791 doagain = 1; 1792 srp = rp = fdc_dmap; 1793 erp = (u_long *)((u_short *)rp + sc->type->nreadw); 1794 cnt = 0; 1795 again: 1796 if (doagain == 0 || (rp = srp = fdfindsync(srp, erp)) == NULL) { 1797 #ifdef DIAGNOSTIC 1798 printf("%s: corrupted track (%d) data.\n", 1799 sc->sc_dv.dv_xname, sc->cachetrk); 1800 #endif 1801 return(-1); 1802 } 1803 1804 /* 1805 * process sectors 1806 */ 1807 for (; cnt < sc->nsectors; cnt++) { 1808 hcksum = dcksum = 0; 1809 rp = mfmblkdecode(rp, &info, &hcksum, 1); 1810 rp = mfmblkdecode(rp, mfmnull, &hcksum, 4); 1811 rp = mfmblkdecode(rp, &cktmp, NULL, 1); 1812 if (cktmp != hcksum) { 1813 #ifdef FDDEBUG 1814 printf(" info 0x%lx hchksum 0x%lx trkhcksum 0x%lx\n", 1815 info, hcksum, cktmp); 1816 #endif 1817 goto again; 1818 } 1819 if (((info >> 16) & 0xff) != sc->cachetrk) { 1820 #ifdef DEBUG 1821 printf("%s: incorrect track found: 0x%lx %d\n", 1822 sc->sc_dv.dv_xname, info, sc->cachetrk); 1823 #endif 1824 goto again; 1825 } 1826 #ifdef FDDEBUG 1827 printf(" info 0x%lx\n", info); 1828 #endif 1829 1830 rp = mfmblkdecode(rp, &cktmp, NULL, 1); 1831 dp = sc->cachep; 1832 dp += FDSECLWORDS * ((info >> 8) & 0xff); 1833 crp = mfmblkdecode(rp, dp, &dcksum, FDSECLWORDS); 1834 if (cktmp != dcksum) { 1835 #ifdef FDDEBUG 1836 printf(" info 0x%lx dchksum 0x%lx trkdcksum 0x%lx\n", 1837 info, dcksum, cktmp); 1838 #endif 1839 goto again; 1840 } 1841 1842 /* 1843 * if we are at gap then we can no longer be sure 1844 * of correct sync marks 1845 */ 1846 if ((info && 0xff) == 1) 1847 doagain = 1; 1848 else 1849 doagain = 0; 1850 srp = rp = fdfindsync(crp, erp); 1851 } 1852 return(0); 1853 } 1854 1855 void 1856 mscachetoraw(struct fd_softc *sc) 1857 { 1858 u_short *rp, *erp, crc; 1859 u_char *cp, tb[5]; 1860 int sec, i; 1861 1862 rp = (u_short *)fdc_dmap; 1863 erp = rp + sc->type->nwritew; 1864 cp = sc->cachep; 1865 1866 /* 1867 * initial track filler (828 * GAP1) 1868 */ 1869 for (i = 0; i < sc->type->gap; i++) { 1870 *rp++ = FDMFMGAP1; 1871 *rp++ = FDMFMGAP1; 1872 } 1873 1874 for (sec = 0; sec < sc->nsectors; sec++) { 1875 1876 /* 1877 * leading sector gap 1878 * (12 * GAP2) + (3 * SYNC) 1879 */ 1880 for (i = 0; i < 12; i++) 1881 *rp++ = FDMFMGAP2; 1882 *rp++ = FDMFMSYNC; 1883 *rp++ = FDMFMSYNC; 1884 *rp++ = FDMFMSYNC; 1885 1886 /* 1887 * sector information 1888 * (ID) + track + side + sector + sector size + CRC16 1889 */ 1890 *rp++ = FDMFMID; 1891 tb[0] = sc->cachetrk / FDNHEADS; 1892 tb[1] = sc->cachetrk % FDNHEADS; 1893 tb[2] = sec + 1; 1894 i = sc->bytespersec; 1895 tb[3] = i < 256 ? 0 : (i < 512 ? 1 : (i < 1024 ? 2 : 3)); 1896 rp = msblkencode(rp, tb, 4, &crc); 1897 tb[0] = crc >> 8; 1898 tb[1] = crc & 0xff; 1899 tb[2] = 0x4e; /* GAP1 decoded */ 1900 rp = msblkencode(rp, tb, 3, 0); 1901 1902 /* 1903 * sector info/data gap 1904 * (22 * GAP1) + (12 * GAP2) + (3 * SYNC) 1905 */ 1906 for (i = 0; i < 21; i++) 1907 *rp++ = FDMFMGAP1; 1908 for (i = 0; i < 12; i++) 1909 *rp++ = FDMFMGAP2; 1910 *rp++ = FDMFMSYNC; 1911 *rp++ = FDMFMSYNC; 1912 *rp++ = FDMFMSYNC; 1913 1914 /* 1915 * sector data 1916 * (DATA) + ...data... + CRC16 1917 */ 1918 *rp++ = FDMFMDATA; 1919 rp = msblkencode(rp, cp, sc->bytespersec, &crc); 1920 cp += sc->bytespersec; 1921 tb[0] = crc >> 8; 1922 tb[1] = crc & 0xff; 1923 tb[2] = 0x4e; /* GAP3 decoded */ 1924 rp = msblkencode(rp, tb, 3, 0); 1925 1926 /* 1927 * trailing sector gap 1928 * (80 * GAP3) 1929 */ 1930 for (i = 0; i < 79; i++) 1931 *rp++ = FDMFMGAP3; 1932 } 1933 1934 /* 1935 * fill rest of track with GAP3 1936 */ 1937 while (rp != erp) 1938 *rp++ = FDMFMGAP3; 1939 1940 } 1941 1942 int 1943 msrawtocache(struct fd_softc *sc) 1944 { 1945 u_short *rp, *srp, *erp; 1946 u_char tb[5], *cp; 1947 int ct, sec, retry; 1948 1949 srp = rp = (u_short *)fdc_dmap; 1950 erp = rp + sc->type->nreadw; 1951 cp = sc->cachep; 1952 1953 for (ct = 0; ct < sc->nsectors; ct++) { 1954 retry = 1; 1955 do { 1956 /* 1957 * skip leading gap to sync 1958 */ 1959 if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) { 1960 #ifdef DIAGNOSTIC 1961 printf("%s: corrupted track (%d) data.\n", 1962 sc->sc_dv.dv_xname, sc->cachetrk); 1963 #endif 1964 return(-1); 1965 } 1966 1967 /* 1968 * Grab sector info 1969 */ 1970 if (*rp++ != FDMFMID) 1971 continue; 1972 rp = msblkdecode(rp, tb, 4); 1973 #ifdef FDDEBUG 1974 printf("sector id: sector %d, track %d, side %d," 1975 "bps %d\n", tb[2], tb[0], tb[1], 128 << tb[3]); 1976 #endif 1977 if ((tb[0] * FDNHEADS + tb[1]) != sc->cachetrk || 1978 tb[2] > sc->nsectors) 1979 continue; 1980 1981 sec = tb[2]; 1982 sc->bytespersec = 128 << tb[3]; 1983 rp += 2; /* skip CRC-16 */ 1984 1985 /* 1986 * skip gap and read in data 1987 */ 1988 if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) 1989 return(-1); 1990 if (*rp++ != FDMFMDATA) 1991 continue; 1992 rp = msblkdecode(rp, cp + ((sec-1) * sc->bytespersec), 1993 sc->bytespersec); 1994 rp += 2; /* skip CRC-16 */ 1995 1996 retry = 0; 1997 } while (retry); 1998 } 1999 return(0); 2000 } 2001 2002 /* 2003 * encode len longwords of `dp' data in amiga mfm block format (`rp') 2004 * this format specified that the odd bits are at current pos and even 2005 * bits at len + current pos 2006 */ 2007 u_long * 2008 mfmblkencode(u_long *dp, u_long *rp, u_long *cp, int len) 2009 { 2010 u_long *sdp, *edp, d, dtmp, correct; 2011 2012 sdp = dp; 2013 edp = dp + len; 2014 2015 if (*(rp - 1) & 0x1) 2016 correct = 1; 2017 else 2018 correct = 0; 2019 /* 2020 * do odd bits 2021 */ 2022 while (dp < edp) { 2023 d = (*dp >> 1) & 0x55555555; /* remove clock bits */ 2024 dtmp = d ^ 0x55555555; 2025 d |= ((dtmp >> 1) | 0x80000000) & (dtmp << 1); 2026 /* 2027 * correct upper clock bit if needed 2028 */ 2029 if (correct) 2030 d &= 0x7fffffff; 2031 if (d & 0x1) 2032 correct = 1; 2033 else 2034 correct = 0; 2035 /* 2036 * do checksums and store in raw buffer 2037 */ 2038 if (cp) 2039 *cp ^= d; 2040 *rp++ = d; 2041 dp++; 2042 } 2043 /* 2044 * do even bits 2045 */ 2046 dp = sdp; 2047 while (dp < edp) { 2048 d = *dp & 0x55555555; /* remove clock bits */ 2049 dtmp = d ^ 0x55555555; 2050 d |= ((dtmp >> 1) | 0x80000000) & (dtmp << 1); 2051 /* 2052 * correct upper clock bit if needed 2053 */ 2054 if (correct) 2055 d &= 0x7fffffff; 2056 if (d & 0x1) 2057 correct = 1; 2058 else 2059 correct = 0; 2060 /* 2061 * do checksums and store in raw buffer 2062 */ 2063 if (cp) 2064 *cp ^= d; 2065 *rp++ = d; 2066 dp++; 2067 } 2068 if (cp) 2069 *cp &= 0x55555555; 2070 return(rp); 2071 } 2072 2073 /* 2074 * decode len longwords of `dp' data in amiga mfm block format (`rp') 2075 * this format specified that the odd bits are at current pos and even 2076 * bits at len + current pos 2077 */ 2078 u_long * 2079 mfmblkdecode(u_long *rp, u_long *dp, u_long *cp, int len) 2080 { 2081 u_long o, e; 2082 int cnt; 2083 2084 cnt = len; 2085 while (cnt--) { 2086 o = *rp; 2087 e = *(rp + len); 2088 if (cp) { 2089 *cp ^= o; 2090 *cp ^= e; 2091 } 2092 o &= 0x55555555; 2093 e &= 0x55555555; 2094 *dp++ = (o << 1) | e; 2095 rp++; 2096 } 2097 if (cp) 2098 *cp &= 0x55555555; 2099 return(rp + len); 2100 } 2101 2102 /* 2103 * decode len words in standard MFM format to len bytes 2104 * of data. 2105 */ 2106 u_short * 2107 msblkdecode(u_short *rp, u_char *cp, int len) 2108 { 2109 while (len--) { 2110 *cp++ = msdecode[*rp & 0x7f] | 2111 (msdecode[(*rp >> 8) & 0x7f] << 4); 2112 rp++; 2113 } 2114 2115 return(rp); 2116 } 2117 2118 /* 2119 * encode len bytes of data into len words in standard MFM format. 2120 * If a pointer is supplied for crc, calculate the CRC-16 of the data 2121 * as well. 2122 */ 2123 u_short * 2124 msblkencode(u_short *rp, u_char *cp, int len, u_short *crc) 2125 { 2126 u_short td; 2127 u_short mycrc; 2128 2129 /* preload crc for header (4 bytes) 2130 * or data (anything else) 2131 */ 2132 mycrc = (len == 4) ? 0xb230 : 0xe295; 2133 2134 while (len--) { 2135 td = (msencode[*cp >> 4] << 8) | msencode[*cp & 0x0f]; 2136 2137 /* Check for zeros in top bit of encode and bottom 2138 * bit of previous encode. if so, slap a one in betweem 2139 * them. 2140 */ 2141 if ((td & 0x140) == 0) 2142 td |= 0x80; 2143 if ((td & 0x4000) == 0 && (rp[-1] & 1) == 0) 2144 td |= 0x8000; 2145 2146 *rp++ = td; 2147 2148 /* 2149 * calc crc if requested 2150 */ 2151 if (crc) 2152 mycrc = (mycrc << 8) ^ mscrctab[*cp ^ (mycrc >> 8)]; 2153 2154 cp++; 2155 } 2156 2157 if (crc) 2158 *crc = mycrc; 2159 2160 return(rp); 2161 } 2162