fd.c revision 1.2
1 /* $NetBSD: fd.c,v 1.2 1995/04/10 08:56:18 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Leo Weppelman. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Leo Weppelman. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * This file contains a driver for the Floppy Disk Controller (FDC) 35 * on the Atari TT. It uses the WD 1772 chip, modified for steprates. 36 * 37 * The ST floppy disk controller shares the access to the DMA circuitry 38 * with other devices. For this reason the floppy disk controller makes 39 * use of some special DMA accessing code. 40 * 41 * Interrupts from the FDC are in fact DMA interrupts which get their 42 * first level handling in 'dma.c' . If the floppy driver is currently 43 * using DMA the interrupt is signalled to 'fdcint'. 44 * 45 * TODO: 46 * - Test it with 2 drives (I don't have them) 47 * - Test it with an HD-drive (Don't have that either) 48 * - Finish ioctl's 49 */ 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/kernel.h> 54 #include <sys/malloc.h> 55 #include <sys/buf.h> 56 #include <sys/device.h> 57 #include <sys/ioctl.h> 58 #include <sys/fcntl.h> 59 #include <sys/conf.h> 60 #include <sys/disklabel.h> 61 #include <sys/disk.h> 62 #include <sys/dkbad.h> 63 #include <atari/atari/device.h> 64 #include <machine/disklabel.h> 65 #include <machine/iomap.h> 66 #include <machine/mfp.h> 67 #include <machine/dma.h> 68 #include <machine/video.h> 69 #include <atari/dev/fdreg.h> 70 71 /* 72 * Be verbose for debugging 73 */ 74 /*#define FLP_DEBUG 1 */ 75 76 #define FDC_DELAY 64 /* for dma[rw]dat() */ 77 #define FDC_MAX_DMA_AD 0x1000000 /* No DMA possible beyond */ 78 79 /* Parameters for the disk drive. */ 80 #define SECTOR_SIZE 512 /* physical sector size in bytes */ 81 #define NR_DRIVES 2 /* maximum number of drives */ 82 #define NR_TYPES 3 /* number of diskette/drive combinations*/ 83 #define MAX_ERRORS 10 /* how often to try rd/wt before quitting*/ 84 #define STEP_DELAY 6000 /* 6ms (6000us) delay after stepping */ 85 86 87 #define INV_TRK 32000 /* Should fit in unsigned short */ 88 #define INV_PART NR_TYPES 89 90 /* 91 * Driver states 92 */ 93 #define FLP_IDLE 0x00 /* floppy is idle */ 94 #define FLP_MON 0x01 /* idle with motor on */ 95 #define FLP_STAT 0x02 /* determine floppy status */ 96 #define FLP_XFER 0x04 /* read/write data from floppy */ 97 98 /* 99 * Timer delay's 100 */ 101 #define FLP_MONDELAY (3 * hz) /* motor-on delay */ 102 #define FLP_XFERDELAY (2 * hz) /* timeout on transfer */ 103 104 105 #define b_block b_resid /* FIXME: this is not the place */ 106 107 /* 108 * Global data for all physical floppy devices 109 */ 110 static short selected = 0; /* drive/head currently selected*/ 111 static short motoron = 0; /* motor is spinning */ 112 static short nopens = 0; /* Number of opens executed */ 113 114 static short fd_state = FLP_IDLE;/* Current driver state */ 115 static short fd_in_dma= 0; /* 1: dmagrab() called */ 116 static short fd_cmd = 0; /* command being executed */ 117 static char *fd_error= NULL; /* error from fd_xfer_ok() */ 118 119 /* 120 * Private per device data 121 */ 122 struct fd_softc { 123 struct dkdevice dkdev; 124 struct buf bufq; /* queue of buf's */ 125 int unit; /* unit for atari controlling hw*/ 126 int nheads; /* number of heads in use */ 127 int nsectors; /* number of sectors/track */ 128 int nblocks; /* number of blocks on disk */ 129 int curtrk; /* track head positioned on */ 130 short flags; /* misc flags */ 131 short part; /* Current open partition */ 132 int sector; /* logical sector for I/O */ 133 caddr_t io_data; /* KVA for data transfer */ 134 int io_bytes; /* bytes left for I/O */ 135 int io_dir; /* B_READ/B_WRITE */ 136 int errcnt; /* current error count */ 137 u_char *bounceb; /* Bounce buffer */ 138 139 }; 140 141 /* 142 * Flags in fd_softc: 143 */ 144 #define FLPF_NOTRESP 0x01 /* Unit not responding */ 145 #define FLPF_ISOPEN 0x02 /* Unit is open */ 146 #define FLPF_ISHD 0x04 /* Use High Density */ 147 #define FLPF_HAVELAB 0x08 /* We have a valid label */ 148 #define FLPF_BOUNCE 0x10 /* Now using the bounce buffer */ 149 150 struct fd_types { 151 int nheads; /* Heads in use */ 152 int nsectors; /* sectors per track */ 153 int nblocks; /* number of blocks */ 154 } fdtypes[NR_TYPES] = { 155 { 1, 9, 720 }, /* 360 Kb */ 156 { 2, 9, 1440 }, /* 720 Kb */ 157 { 1, 18, 2880 }, /* 1.44 Mb */ 158 }; 159 160 typedef void (*FPV)(); 161 162 /* 163 * Private drive functions.... 164 */ 165 static void fdstart __P((struct fd_softc *)); 166 static void fddone __P((struct fd_softc *)); 167 static void fd_xfer __P((struct fd_softc *)); 168 static int fdcint __P((struct fd_softc *)); 169 static int fd_xfer_ok __P((struct fd_softc *)); 170 static void fdmotoroff __P((struct fd_softc *)); 171 static int fdminphys __P((struct buf *)); 172 static void fdtestdrv __P((struct fd_softc *)); 173 static int fdgetdisklabel __P((struct fd_softc *, dev_t)); 174 175 /* 176 * Autoconfig stuff.... 177 */ 178 static int fdcmatch __P((struct device *, struct cfdata *, void *)); 179 static int fdcprint __P((void *, char *)); 180 static void fdcattach __P((struct device *, struct device *, void *)); 181 182 struct cfdriver fdccd = { 183 NULL, "fdc", (cfmatch_t)fdcmatch, fdcattach, DV_DULL, 184 sizeof(struct device), NULL, 0 }; 185 186 static int 187 fdcmatch(pdp, cfp, auxp) 188 struct device *pdp; 189 struct cfdata *cfp; 190 void *auxp; 191 { 192 if(strcmp("fdc", auxp) || cfp->cf_unit != 0) 193 return(0); 194 return(1); 195 } 196 197 static void 198 fdcattach(pdp, dp, auxp) 199 struct device *pdp, *dp; 200 void *auxp; 201 { 202 struct fd_softc fdsoftc; 203 int i, nfound = 0; 204 205 printf("\n"); 206 for(i = 0; i < NR_DRIVES; i++) { 207 208 /* 209 * Test if unit is present 210 */ 211 fdsoftc.unit = i; 212 fdsoftc.flags = 0; 213 dmagrab(fdcint, fdtestdrv, &fdsoftc); 214 dmafree(); 215 216 if(!(fdsoftc.flags & FLPF_NOTRESP)) { 217 nfound++; 218 config_found(dp, (void*)i, fdcprint); 219 } 220 } 221 222 if(nfound) { 223 /* 224 * enable disk related interrupts 225 */ 226 MFP->mf_ierb |= IB_DINT; 227 MFP->mf_iprb &= ~IB_DINT; 228 MFP->mf_imrb |= IB_DINT; 229 } 230 } 231 232 static int 233 fdcprint(auxp, pnp) 234 void *auxp; 235 char *pnp; 236 { 237 return(UNCONF); 238 } 239 240 static int fdmatch __P((struct device *, struct cfdata *, void *)); 241 static void fdattach __P((struct device *, struct device *, void *)); 242 void fdstrategy __P((struct buf *)); 243 struct dkdriver fddkdriver = { fdstrategy }; 244 245 struct cfdriver fdcd = { 246 NULL, "fd", (cfmatch_t)fdmatch, fdattach, DV_DISK, 247 sizeof(struct fd_softc), NULL, 0 }; 248 249 static int 250 fdmatch(pdp, cfp, auxp) 251 struct device *pdp; 252 struct cfdata *cfp; 253 void *auxp; 254 { 255 int unit = (int)auxp; 256 return(1); 257 } 258 259 static void 260 fdattach(pdp, dp, auxp) 261 struct device *pdp, *dp; 262 void *auxp; 263 { 264 struct fd_softc *sc; 265 266 sc = (struct fd_softc *)dp; 267 268 printf("\n"); 269 270 sc->dkdev.dk_driver = &fddkdriver; 271 } 272 273 fdioctl(dev, cmd, addr, flag, p) 274 dev_t dev; 275 u_long cmd; 276 int flag; 277 caddr_t addr; 278 struct proc *p; 279 { 280 struct fd_softc *sc; 281 void *data; 282 283 sc = getsoftc(fdcd, DISKUNIT(dev)); 284 285 if((sc->flags & FLPF_HAVELAB) == 0) 286 return(EBADF); 287 288 switch(cmd) { 289 case DIOCSBAD: 290 return(EINVAL); 291 case DIOCGDINFO: 292 *(struct disklabel *)addr = sc->dkdev.dk_label; 293 return(0); 294 case DIOCGPART: 295 ((struct partinfo *)addr)->disklab = 296 &sc->dkdev.dk_label; 297 ((struct partinfo *)addr)->part = 298 &sc->dkdev.dk_label.d_partitions[DISKPART(dev)]; 299 return(0); 300 #ifdef notyet /* XXX LWP */ 301 case DIOCSRETRIES: 302 case DIOCSSTEP: 303 case DIOCSDINFO: 304 case DIOCWDINFO: 305 case DIOCWLABEL: 306 #endif /* notyet */ 307 default: 308 return(ENOTTY); 309 } 310 } 311 312 /* 313 * Open the device. If this is the first open on both the floppy devices, 314 * intialize the controller. 315 * Note that partition info on the floppy device is used to distinguise 316 * between 780Kb and 360Kb floppy's. 317 * partition 0: 360Kb 318 * partition 1: 780Kb 319 */ 320 Fdopen(dev, flags, devtype, proc) 321 dev_t dev; 322 int flags, devtype; 323 struct proc *proc; 324 { 325 struct fd_softc *sc; 326 int sps; 327 328 #ifdef FLP_DEBUG 329 printf("Fdopen dev=0x%x\n", dev); 330 #endif 331 332 if(DISKPART(dev) >= NR_TYPES) 333 return(ENXIO); 334 335 if((sc = getsoftc(fdcd, DISKUNIT(dev))) == NULL) 336 return(ENXIO); 337 338 /* 339 * If no floppy currently open, reset the controller and select 340 * floppy type. 341 */ 342 if(!nopens) { 343 344 #ifdef FLP_DEBUG 345 printf("Fdopen device not yet open\n"); 346 #endif 347 nopens++; 348 dmawdat(FDC_CS, IRUPT, FDC_DELAY); 349 } 350 351 if(!(sc->flags & FLPF_ISOPEN)) { 352 /* 353 * Initialise some driver values. 354 */ 355 int part = DISKPART(dev); 356 void *addr; 357 358 sc->bufq.b_actf = NULL; 359 sc->unit = DISKUNIT(dev); 360 sc->part = part; 361 sc->nheads = fdtypes[part].nheads; 362 sc->nsectors = fdtypes[part].nsectors; 363 sc->nblocks = fdtypes[part].nblocks; 364 sc->curtrk = INV_TRK; 365 sc->sector = 0; 366 sc->errcnt = 0; 367 sc->bounceb = (u_char*)alloc_stmem(SECTOR_SIZE, &addr); 368 if(sc->bounceb == NULL) 369 return(ENOMEM); /* XXX */ 370 if(sc->nsectors > 9) /* XXX */ 371 sc->flags |= FLPF_ISHD; 372 373 sc->flags = FLPF_ISOPEN; 374 } 375 else { 376 /* 377 * Multiply opens are granted when accessing the same type of 378 * floppy (eq. the same partition). 379 */ 380 if(sc->part != DISKPART(dev)) 381 return(ENXIO); /* XXX temporarely out of business */ 382 } 383 fdgetdisklabel(sc, dev); 384 #ifdef FLP_DEBUG 385 printf("Fdopen open succeeded on type %d\n", sc->part); 386 #endif 387 } 388 389 fdclose(dev, flags, devtype, proc) 390 dev_t dev; 391 int flags, devtype; 392 struct proc *proc; 393 { 394 struct fd_softc *sc; 395 396 sc = getsoftc(fdcd, DISKUNIT(dev)); 397 free_stmem(sc->bounceb); 398 sc->flags = 0; 399 nopens--; 400 401 #ifdef FLP_DEBUG 402 printf("Closed floppy device -- nopens: %d\n", nopens); 403 #endif 404 } 405 406 void 407 fdstrategy(bp) 408 struct buf *bp; 409 { 410 struct fd_softc *sc; 411 int sps, nblocks; 412 413 sc = getsoftc(fdcd, DISKUNIT(bp->b_dev)); 414 415 #ifdef FLP_DEBUG 416 printf("fdstrategy: 0x%x\n", bp); 417 #endif 418 419 /* 420 * check for valid partition and bounds 421 */ 422 nblocks = (bp->b_bcount + SECTOR_SIZE - 1) / SECTOR_SIZE; 423 if((bp->b_blkno < 0) || ((bp->b_blkno + nblocks) >= sc->nblocks)) { 424 if((bp->b_blkno == sc->nblocks) && (bp->b_flags & B_READ)) { 425 /* 426 * Read 1 block beyond, return EOF 427 */ 428 bp->b_resid = bp->b_bcount; 429 goto done; 430 } 431 /* 432 * Try to limit the size of the transaction, adjust count 433 * if we succeed. 434 */ 435 nblocks = sc->nblocks - bp->b_blkno; 436 if((nblocks <= 0) || (bp->b_blkno < 0)) { 437 bp->b_error = EINVAL; 438 bp->b_flags |= B_ERROR; 439 goto done; 440 } 441 bp->b_bcount = nblocks * SECTOR_SIZE; 442 } 443 if(bp->b_bcount == 0) 444 goto done; 445 446 /* 447 * Set order info for disksort 448 */ 449 bp->b_block = bp->b_blkno / (sc->nsectors * sc->nheads); 450 451 /* 452 * queue the buf and kick the low level code 453 */ 454 sps = splbio(); 455 disksort(&sc->bufq, bp); 456 if(!fd_in_dma) { 457 if(fd_state & FLP_MON) 458 untimeout((FPV)fdmotoroff, (void*)sc); 459 fd_state = FLP_IDLE; 460 fd_in_dma = 1; dmagrab(fdcint, fdstart, sc); 461 } 462 splx(sps); 463 464 return; 465 done: 466 bp->b_resid = bp->b_bcount; 467 biodone(bp); 468 } 469 470 /* 471 * no dumps to floppy disks thank you. 472 */ 473 int 474 fdsize(dev) 475 dev_t dev; 476 { 477 return(-1); 478 } 479 480 int 481 fdread(dev, uio) 482 dev_t dev; 483 struct uio *uio; 484 { 485 return(physio(cdevsw[major(dev)].d_strategy, (struct buf *)NULL, 486 dev, B_READ, fdminphys, uio)); 487 } 488 489 int 490 fdwrite(dev, uio) 491 dev_t dev; 492 struct uio *uio; 493 { 494 return(physio(cdevsw[major(dev)].d_strategy, (struct buf *)NULL, 495 dev, B_WRITE, fdminphys, uio)); 496 } 497 498 /* 499 * Called through the dma-dispatcher. So we know we are the only ones 500 * messing with the floppy-controler. 501 * Initialize some fields in the fdsoftc for the state-machine and get 502 * it going. 503 */ 504 static void 505 fdstart(sc) 506 struct fd_softc *sc; 507 { 508 struct buf *bp; 509 510 bp = sc->bufq.b_actf; 511 sc->sector = bp->b_blkno; /* Start sector for I/O */ 512 sc->io_data = bp->b_data; /* KVA base for I/O */ 513 sc->io_bytes = bp->b_bcount; /* Transfer size in bytes */ 514 sc->io_dir = bp->b_flags & B_READ;/* Direction of transfer */ 515 sc->errcnt = 0; /* No errors yet */ 516 fd_state = FLP_XFER; /* Yes, we're going to transfer */ 517 518 /* 519 * Make sure the floppy controller is the correct density mode 520 */ 521 if(sc->flags & FLPF_ISHD) 522 DMA->dma_drvmode |= (FDC_HDSET|FDC_HDSIG); 523 else DMA->dma_drvmode &= ~(FDC_HDSET|FDC_HDSIG); 524 fd_xfer(sc); 525 } 526 527 /* 528 * The current transaction is finished (for good or bad). Let go of 529 * the the dma-resources. Call biodone() to finish the transaction. 530 * Find a new transaction to work on. 531 */ 532 static void 533 fddone(sc) 534 register struct fd_softc *sc; 535 { 536 struct buf *bp, *dp; 537 struct fd_softc *sc1; 538 int i; 539 540 /* 541 * Lower clock frequency of FDC (better for some old ones). 542 */ 543 DMA->dma_drvmode &= ~(FDC_HDSET|FDC_HDSIG); 544 545 dp = &sc->bufq; 546 bp = dp->b_actf; 547 if(bp == NULL) 548 panic("fddone"); 549 dp->b_actf = bp->b_actf; 550 551 #ifdef FLP_DEBUG 552 printf("fddone: unit: %d, buf: %x, resid: %d\n",sc->unit,bp, 553 sc->io_bytes); 554 #endif 555 /* 556 * Give others a chance to use the dma. 557 */ 558 fd_in_dma = 0; dmafree(); 559 560 /* 561 * Finish current transaction. 562 */ 563 bp->b_resid = sc->io_bytes; 564 biodone(bp); 565 566 if(fd_in_dma) 567 return; /* XXX Is this possible? */ 568 569 /* 570 * Find a new transaction on round-robin basis. 571 */ 572 for(i = sc->unit + 1; ;i++) { 573 if(i >= fdcd.cd_ndevs) 574 i = 0; 575 if((sc1 = fdcd.cd_devs[i]) == NULL) 576 continue; 577 if(sc1->bufq.b_actf) 578 break; 579 if(i == sc->unit) { 580 timeout((FPV)fdmotoroff, (void*)sc, FLP_MONDELAY); 581 #ifdef FLP_DEBUG 582 printf("fddone: Nothing to do\n"); 583 #endif 584 return; /* No work */ 585 } 586 } 587 fd_state = FLP_IDLE; 588 #ifdef FLP_DEBUG 589 printf("fddone: Staring job on unit %d\n", sc1->unit); 590 #endif 591 fd_in_dma = 1; dmagrab(fdcint, fdstart, sc1); 592 } 593 594 /**************************************************************************** 595 * The following functions assume to be running as a result of a * 596 * disk-interrupt (e.q. spl = splbio). * 597 * They form the finit-state machine, the actual driver. * 598 * * 599 * fdstart()/ --> fd_xfer() -> activate hardware * 600 * fdopen() ^ * 601 * | * 602 * +-- not ready -<------------+ * 603 * | * 604 * fdmotoroff()/ --> fdcint() -> fd_xfer_ok() ---+ * 605 * h/w interrupt | * 606 * \|/ * 607 * finished ---> fdone() * 608 * * 609 ****************************************************************************/ 610 static void 611 fd_xfer(sc) 612 struct fd_softc *sc; 613 { 614 register int head = 0; 615 register int track, sector, hbit; 616 int i; 617 u_long phys_addr; 618 619 if(fd_state != FLP_XFER) 620 panic("fd_xfer: wrong state (0x%x)", fd_state); 621 622 /* 623 * Calculate head/track values 624 */ 625 track = sc->sector / sc->nsectors; 626 head = track % sc->nheads; 627 track = track / sc->nheads; 628 #ifdef FLP_DEBUG 629 printf("fd_xfer: sector:%d,head:%d,track:%d\n", sc->sector,head,track); 630 #endif 631 632 /* 633 * Determine if the controller should check spin-up. 634 */ 635 hbit = motoron ? HBIT : 0; 636 motoron = 1; 637 638 /* 639 * Select the right unit and head. 640 */ 641 i = (sc->unit ? PA_FLOP1 : PA_FLOP0) | head; 642 if(i != selected) { 643 selected = i; 644 SOUND->sd_selr = YM_IOA; 645 SOUND->sd_wdat = (SOUND->sd_rdat & 0xF8) | (i ^ 0x07); 646 } 647 648 if(sc->curtrk == INV_TRK) { 649 /* 650 * Recalibrate, since we lost track of head positioning. 651 * The floppy disk controller has no way of determining its 652 * absolute arm position (track). Instead, it steps the 653 * arm a track at a time and keeps track of where it 654 * thinks it is (in software). However, after a SEEK, the 655 * hardware reads information from the diskette telling 656 * where the arm actually is. If the arm is in the wrong place, 657 * a recalibration is done, which forces the arm to track 0. 658 * This way the controller can get back into sync with reality. 659 */ 660 dmawdat(FDC_CS, RESTORE|VBIT|hbit, FDC_DELAY); 661 fd_cmd = RESTORE; 662 timeout((FPV)fdmotoroff, (void*)sc, FLP_XFERDELAY); 663 664 #ifdef FLP_DEBUG 665 printf("fd_xfer:Recalibrating drive %d\n", sc->unit); 666 #endif 667 return; 668 } 669 670 dmawdat(FDC_TR, sc->curtrk, FDC_DELAY); 671 672 /* 673 * Issue a SEEK command on the indicated drive unless the arm is 674 * already positioned on the correct track. 675 */ 676 if(track != sc->curtrk) { 677 sc->curtrk = track; /* be optimistic */ 678 dmawdat(FDC_DR, track, FDC_DELAY); 679 dmawdat(FDC_CS, SEEK|RATE6|VBIT|hbit, FDC_DELAY); 680 timeout((FPV)fdmotoroff, (void*)sc, FLP_XFERDELAY); 681 fd_cmd = SEEK; 682 #ifdef FLP_DEBUG 683 printf("fd_xfer:Seek to track %d on drive %d\n",track,sc->unit); 684 #endif 685 return; 686 } 687 688 /* 689 * The drive is now on the proper track. Read or write 1 block. 690 */ 691 sector = sc->sector % sc->nsectors; 692 sector++; /* start numbering at 1 */ 693 694 dmawdat(FDC_SR, sector, FDC_DELAY); 695 696 phys_addr = (u_long)kvtop(sc->io_data); 697 if(phys_addr >= FDC_MAX_DMA_AD) { 698 /* 699 * We _must_ bounce this address 700 */ 701 phys_addr = (u_long)kvtop(sc->bounceb); 702 if(sc->io_dir == B_WRITE) 703 bcopy(sc->io_data, sc->bounceb, SECTOR_SIZE); 704 sc->flags |= FLPF_BOUNCE; 705 } 706 dmaaddr(phys_addr); /* DMA address setup */ 707 708 #ifdef FLP_DEBUG 709 printf("fd_xfer:Start io (io_addr:%x)\n", kvtop(sc->io_data)); 710 #endif 711 712 if(sc->io_dir == B_READ) { 713 /* Issue the command */ 714 dmacomm(FDC | SCREG, 1, 0); 715 dmawdat(FDC_CS, F_READ|hbit, FDC_DELAY); 716 fd_cmd = F_READ; 717 } 718 else { 719 /* Issue the command */ 720 dmacomm(WRBIT | FDC | SCREG, 1, FDC_DELAY); 721 dmawdat(WRBIT | FDC_CS, F_WRITE|hbit|EBIT|PBIT, FDC_DELAY); 722 fd_cmd = F_WRITE; 723 } 724 timeout((FPV)fdmotoroff, (void*)sc, FLP_XFERDELAY); 725 } 726 727 /* return values of fd_xfer_ok(): */ 728 #define X_OK 0 729 #define X_AGAIN 1 730 #define X_ERROR 2 731 #define X_FAIL 3 732 733 /* 734 * Hardware interrupt function. 735 */ 736 static int 737 fdcint(sc) 738 struct fd_softc *sc; 739 { 740 struct buf *bp; 741 742 #ifdef FLP_DEBUG 743 printf("fdcint: unit = %d\n", sc->unit); 744 #endif 745 746 /* 747 * Cancel timeout (we made it, didn't we) 748 */ 749 untimeout((FPV)fdmotoroff, (void*)sc); 750 751 switch(fd_xfer_ok(sc)) { 752 case X_ERROR : 753 if(++(sc->errcnt) < MAX_ERRORS) { 754 /* 755 * Command failed but still retries left. 756 */ 757 break; 758 } 759 /* FALL THROUGH */ 760 case X_FAIL : 761 /* 762 * Non recoverable error. Fall back to motor-on 763 * idle-state. 764 */ 765 bp = sc->bufq.b_actf; 766 767 bp->b_error = EIO; 768 bp->b_flags |= B_ERROR; 769 fd_state = FLP_MON; 770 if(fd_error != NULL) { 771 printf("Floppy error: %s\n", fd_error); 772 fd_error = NULL; 773 } 774 775 break; 776 case X_AGAIN: 777 /* 778 * Start next part of state machine. 779 */ 780 break; 781 case X_OK: 782 /* 783 * Command ok and finished. Reset error-counter. 784 * If there are no more bytes to transfer fall back 785 * to motor-on idle state. 786 */ 787 sc->errcnt = 0; 788 if((sc->flags & FLPF_BOUNCE) && (sc->io_dir == B_READ)) 789 bcopy(sc->bounceb, sc->io_data, SECTOR_SIZE); 790 sc->flags &= ~FLPF_BOUNCE; 791 792 sc->sector++; 793 sc->io_data += SECTOR_SIZE; 794 sc->io_bytes -= SECTOR_SIZE; 795 if(sc->io_bytes <= 0) 796 fd_state = FLP_MON; 797 } 798 if(fd_state == FLP_MON) 799 fddone(sc); 800 else fd_xfer(sc); 801 } 802 803 /* 804 * Determine status of last command. Should only be called through 805 * 'fdcint()'. 806 * Returns: 807 * X_ERROR : Error on command; might succeed next time. 808 * X_FAIL : Error on command; will never succeed. 809 * X_AGAIN : Part of a command succeeded, call 'fd_xfer()' to complete. 810 * X_OK : Command succeeded and is complete. 811 * 812 * This function only affects sc->curtrk. 813 */ 814 static int 815 fd_xfer_ok(sc) 816 register struct fd_softc *sc; 817 { 818 register int status; 819 820 switch(fd_cmd) { 821 case IRUPT: 822 /* 823 * Timeout. Force a recalibrate before we try again. 824 */ 825 fd_error = "Timeout"; 826 sc->curtrk = INV_TRK; 827 return(X_ERROR); 828 case F_READ: 829 /* 830 * Test for DMA error 831 */ 832 status = dmastat(FDC_CS | SCREG, 0); 833 if(!(status & DMAOK)) { 834 fd_error = "Dma error"; 835 return(X_ERROR); 836 } 837 /* 838 * Get controller status and check for errors. 839 */ 840 status = dmardat(FDC_CS, FDC_DELAY); 841 if(status & (RNF | CRCERR | LD_T00)) { 842 fd_error = "Read error"; 843 if(status & RNF) 844 sc->curtrk = INV_TRK; 845 return(X_ERROR); 846 } 847 break; 848 case F_WRITE: 849 /* 850 * Get controller status and check for errors. 851 */ 852 status = dmardat(WRBIT | FDC_CS, FDC_DELAY); 853 if(status & WRI_PRO) { 854 fd_error = "Write protected"; 855 return(X_FAIL); 856 } 857 if(status & (RNF | CRCERR | LD_T00)) { 858 fd_error = "Write error"; 859 sc->curtrk = INV_TRK; 860 return(X_ERROR); 861 } 862 break; 863 case SEEK: 864 status = dmardat(FDC_CS, FDC_DELAY); 865 if(status & (RNF | CRCERR)) { 866 fd_error = "Seek error"; 867 sc->curtrk = INV_TRK; 868 return(X_ERROR); 869 } 870 return(X_AGAIN); 871 case RESTORE: 872 /* 873 * Determine if the recalibration succeeded. 874 */ 875 status = dmardat(FDC_CS, FDC_DELAY); 876 if(status & RNF) { 877 fd_error = "Recalibrate error"; 878 /* reset controller */ 879 dmawdat(FDC_CS, IRUPT, FDC_DELAY); 880 sc->curtrk = INV_TRK; 881 return(X_ERROR); 882 } 883 sc->curtrk = 0; 884 return(X_AGAIN); 885 default: 886 fd_error = "Driver error: fd_xfer_ok : Unknown state"; 887 return(X_FAIL); 888 } 889 return(X_OK); 890 } 891 892 /* 893 * All timeouts will call this function. 894 */ 895 static void 896 fdmotoroff(sc) 897 struct fd_softc *sc; 898 { 899 int sps, wrbit; 900 901 /* 902 * Get at harware interrupt level 903 */ 904 sps = splbio(); 905 906 #if FLP_DEBUG 907 printf("fdmotoroff, state = 0x%x\n", fd_state); 908 #endif 909 910 switch(fd_state) { 911 case FLP_XFER : 912 /* 913 * Timeout during a transfer; cancel transaction 914 * set command to 'IRUPT'. 915 * A drive-interrupt is simulated to trigger the state 916 * machine. 917 */ 918 /* 919 * Cancel current transaction 920 */ 921 wrbit = (fd_cmd == F_WRITE) ? WRBIT : 0; 922 fd_cmd = IRUPT; 923 dmawdat(FDC_CS, wrbit|IRUPT, FDC_DELAY); 924 925 /* 926 * Simulate floppy interrupt. 927 */ 928 fdcint(sc); 929 return; 930 case FLP_MON : 931 /* 932 * Turn motor off. 933 */ 934 if(selected) { 935 SOUND->sd_selr = YM_IOA; 936 SOUND->sd_wdat = SOUND->sd_rdat | 0x07; 937 motoron = selected = 0; 938 } 939 fd_state = FLP_IDLE; 940 break; 941 } 942 splx(sps); 943 } 944 945 /* 946 * min byte count to whats left of the track in question 947 */ 948 static int 949 fdminphys(bp) 950 struct buf *bp; 951 { 952 struct fd_softc *sc; 953 int sec, toff, tsz; 954 955 if((sc = getsoftc(fdcd, DISKUNIT(bp->b_dev))) == NULL) 956 return(ENXIO); 957 958 sec = bp->b_blkno % (sc->nsectors * sc->nheads); 959 toff = sec * SECTOR_SIZE; 960 tsz = sc->nsectors * sc->nheads * SECTOR_SIZE; 961 962 #ifdef FLP_DEBUG 963 printf("fdminphys: before %d", bp->b_bcount); 964 #endif 965 966 bp->b_bcount = min(bp->b_bcount, tsz - toff); 967 968 #ifdef FLP_DEBUG 969 printf(" after %d\n", bp->b_bcount); 970 #endif 971 972 return(bp->b_bcount); 973 } 974 975 /* 976 * Used to find out wich drives are actually connected. We do this by issueing 977 * is 'RESTORE' command and check if the 'track-0' bit is set. This also works 978 * if the drive is present but no floppy is inserted. 979 */ 980 static void 981 fdtestdrv(fdsoftc) 982 struct fd_softc *fdsoftc; 983 { 984 int i, status; 985 986 /* 987 * Select the right unit and head. 988 */ 989 i = fdsoftc->unit ? PA_FLOP1 : PA_FLOP0; 990 if(i != selected) { 991 selected = i; 992 SOUND->sd_selr = YM_IOA; 993 SOUND->sd_wdat = (SOUND->sd_rdat & 0xF8) | (i ^ 0x07); 994 } 995 996 dmawdat(FDC_CS, RESTORE|VBIT|HBIT, FDC_DELAY); 997 998 /* 999 * Wait for about 2 seconds. 1000 */ 1001 delay(2000000); 1002 1003 status = dmardat(FDC_CS, FDC_DELAY); 1004 if(status & (RNF|BUSY)) 1005 dmawdat(FDC_CS, IRUPT, FDC_DELAY); /* reset controller */ 1006 1007 if(!(status & LD_T00)) 1008 fdsoftc->flags |= FLPF_NOTRESP; 1009 } 1010 1011 /* 1012 * Build disk label. For now we only create a label from what we know 1013 * from 'sc'. 1014 */ 1015 static int 1016 fdgetdisklabel(sc, dev) 1017 struct fd_softc *sc; 1018 dev_t dev; 1019 { 1020 struct disklabel *lp, *dlp; 1021 int part; 1022 1023 /* 1024 * If we already got one, get out. 1025 */ 1026 if(sc->flags & FLPF_HAVELAB) 1027 return(0); 1028 1029 #ifdef FLP_DEBUG 1030 printf("fdgetdisklabel()\n"); 1031 #endif 1032 1033 part = DISKPART(dev); 1034 lp = &sc->dkdev.dk_label; 1035 bzero(lp, sizeof(struct disklabel)); 1036 1037 lp->d_secsize = SECTOR_SIZE; 1038 lp->d_ntracks = sc->nheads; 1039 lp->d_nsectors = sc->nsectors; 1040 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 1041 lp->d_ncylinders = sc->nblocks / lp->d_secpercyl; 1042 lp->d_secperunit = sc->nblocks; 1043 1044 lp->d_type = DTYPE_FLOPPY; 1045 lp->d_rpm = 300; /* good guess I suppose. */ 1046 lp->d_interleave = 1; /* FIXME: is this OK? */ 1047 lp->d_bbsize = 0; 1048 lp->d_sbsize = 0; 1049 lp->d_npartitions = part + 1; 1050 lp->d_trkseek = STEP_DELAY; 1051 lp->d_magic = DISKMAGIC; 1052 lp->d_magic2 = DISKMAGIC; 1053 lp->d_checksum = dkcksum(lp); 1054 lp->d_partitions[part].p_size = lp->d_secperunit; 1055 lp->d_partitions[part].p_fstype = FS_UNUSED; 1056 lp->d_partitions[part].p_fsize = 1024; 1057 lp->d_partitions[part].p_frag = 8; 1058 sc->flags |= FLPF_HAVELAB; 1059 1060 return(0); 1061 } 1062
Indexes created Mon Sep 29 21:09:56 GMT 2025