fd.c revision 1.24
1 /* $NetBSD: fd.c,v 1.24 1996/11/06 14:03:15 leo 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/proc.h> 57 #include <sys/device.h> 58 #include <sys/ioctl.h> 59 #include <sys/fcntl.h> 60 #include <sys/conf.h> 61 #include <sys/disklabel.h> 62 #include <sys/disk.h> 63 #include <sys/dkbad.h> 64 #include <atari/atari/device.h> 65 #include <atari/atari/stalloc.h> 66 #include <machine/disklabel.h> 67 #include <machine/iomap.h> 68 #include <machine/mfp.h> 69 #include <machine/dma.h> 70 #include <machine/video.h> 71 #include <machine/cpu.h> 72 #include <atari/dev/ym2149reg.h> 73 #include <atari/dev/fdreg.h> 74 75 /* 76 * Be verbose for debugging 77 */ 78 /*#define FLP_DEBUG 1 */ 79 80 #define FDC_MAX_DMA_AD 0x1000000 /* No DMA possible beyond */ 81 82 /* Parameters for the disk drive. */ 83 #define SECTOR_SIZE 512 /* physical sector size in bytes */ 84 #define NR_DRIVES 2 /* maximum number of drives */ 85 #define NR_TYPES 3 /* number of diskette/drive combinations*/ 86 #define MAX_ERRORS 10 /* how often to try rd/wt before quitting*/ 87 #define STEP_DELAY 6000 /* 6ms (6000us) delay after stepping */ 88 89 90 #define INV_TRK 32000 /* Should fit in unsigned short */ 91 #define INV_PART NR_TYPES 92 93 /* 94 * Driver states 95 */ 96 #define FLP_IDLE 0x00 /* floppy is idle */ 97 #define FLP_MON 0x01 /* idle with motor on */ 98 #define FLP_STAT 0x02 /* determine floppy status */ 99 #define FLP_XFER 0x04 /* read/write data from floppy */ 100 101 /* 102 * Timer delay's 103 */ 104 #define FLP_MONDELAY (3 * hz) /* motor-on delay */ 105 #define FLP_XFERDELAY (2 * hz) /* timeout on transfer */ 106 107 /* 108 * The density codes 109 */ 110 #define FLP_DD 0 /* Double density */ 111 #define FLP_HD 1 /* High density */ 112 113 114 #define b_block b_resid /* FIXME: this is not the place */ 115 116 /* 117 * Global data for all physical floppy devices 118 */ 119 static short selected = 0; /* drive/head currently selected*/ 120 static short motoron = 0; /* motor is spinning */ 121 static short nopens = 0; /* Number of opens executed */ 122 123 static short fd_state = FLP_IDLE; /* Current driver state */ 124 static int lock_stat= 0; /* dma locking status */ 125 static short fd_cmd = 0; /* command being executed */ 126 static char *fd_error= NULL; /* error from fd_xfer_ok() */ 127 128 /* 129 * Private per device data 130 */ 131 struct fd_softc { 132 struct device sc_dv; /* generic device info */ 133 struct disk dkdev; /* generic disk info */ 134 struct buf bufq; /* queue of buf's */ 135 int unit; /* unit for atari controlling hw*/ 136 int nheads; /* number of heads in use */ 137 int nsectors; /* number of sectors/track */ 138 int density; /* density code */ 139 int nblocks; /* number of blocks on disk */ 140 int curtrk; /* track head positioned on */ 141 short flags; /* misc flags */ 142 short part; /* Current open partition */ 143 int sector; /* logical sector for I/O */ 144 caddr_t io_data; /* KVA for data transfer */ 145 int io_bytes; /* bytes left for I/O */ 146 int io_dir; /* B_READ/B_WRITE */ 147 int errcnt; /* current error count */ 148 u_char *bounceb; /* Bounce buffer */ 149 150 }; 151 152 /* 153 * Flags in fd_softc: 154 */ 155 #define FLPF_NOTRESP 0x001 /* Unit not responding */ 156 #define FLPF_ISOPEN 0x002 /* Unit is open */ 157 #define FLPF_SPARE 0x004 /* Not used */ 158 #define FLPF_HAVELAB 0x008 /* We have a valid label */ 159 #define FLPF_BOUNCE 0x010 /* Now using the bounce buffer */ 160 #define FLPF_WRTPROT 0x020 /* Unit is write-protected */ 161 #define FLPF_EMPTY 0x040 /* Unit is empty */ 162 #define FLPF_INOPEN 0x080 /* Currently being opened */ 163 #define FLPF_GETSTAT 0x100 /* Getting unit status */ 164 165 struct fd_types { 166 int nheads; /* Heads in use */ 167 int nsectors; /* sectors per track */ 168 int nblocks; /* number of blocks */ 169 int density; /* density code */ 170 const char *descr; /* type description */ 171 } fdtypes[NR_TYPES] = { 172 { 1, 9, 720 , FLP_DD , "360KB" }, /* 360 Kb */ 173 { 2, 9, 1440 , FLP_DD , "720KB" }, /* 720 Kb */ 174 { 2, 18, 2880 , FLP_HD , "1.44MB" }, /* 1.44 Mb */ 175 }; 176 177 #define FLP_DEFTYPE 1 /* 720Kb, reasonable default */ 178 #define FLP_TYPE(dev) ( DISKPART(dev) == 0 ? FLP_DEFTYPE : DISKPART(dev) - 1 ) 179 180 typedef void (*FPV) __P((void *)); 181 182 /* 183 * {b,c}devsw[] function prototypes 184 */ 185 dev_type_open(fdopen); 186 dev_type_close(fdclose); 187 dev_type_read(fdread); 188 dev_type_write(fdwrite); 189 dev_type_ioctl(fdioctl); 190 dev_type_size(fdsize); 191 dev_type_dump(fddump); 192 193 /* 194 * Private drive functions.... 195 */ 196 static void fdstart __P((struct fd_softc *)); 197 static void fddone __P((struct fd_softc *)); 198 static void fdstatus __P((struct fd_softc *)); 199 static void fd_xfer __P((struct fd_softc *)); 200 static void fdcint __P((struct fd_softc *)); 201 static int fd_xfer_ok __P((struct fd_softc *)); 202 static void fdmotoroff __P((struct fd_softc *)); 203 static void fdminphys __P((struct buf *)); 204 static void fdtestdrv __P((struct fd_softc *)); 205 static int fdgetdisklabel __P((struct fd_softc *, dev_t)); 206 static int fdselect __P((int, int, int)); 207 static void fddeselect __P((void)); 208 static void fdmoff __P((struct fd_softc *)); 209 u_char read_fdreg __P((u_short)); 210 void write_fdreg __P((u_short, u_short)); 211 u_char read_dmastat __P((void)); 212 213 extern __inline__ u_char read_fdreg(u_short regno) 214 { 215 DMA->dma_mode = regno; 216 return(DMA->dma_data); 217 } 218 219 extern __inline__ void write_fdreg(u_short regno, u_short val) 220 { 221 DMA->dma_mode = regno; 222 DMA->dma_data = val; 223 } 224 225 extern __inline__ u_char read_dmastat(void) 226 { 227 DMA->dma_mode = FDC_CS | DMA_SCREG; 228 return(DMA->dma_stat); 229 } 230 231 /* 232 * Autoconfig stuff.... 233 */ 234 static int fdcmatch __P((struct device *, void *, void *)); 235 static int fdcprint __P((void *, const char *)); 236 static void fdcattach __P((struct device *, struct device *, void *)); 237 238 struct cfattach fdc_ca = { 239 sizeof(struct device), fdcmatch, fdcattach 240 }; 241 242 struct cfdriver fdc_cd = { 243 NULL, "fdc", DV_DULL, NULL, 0 244 }; 245 246 static int 247 fdcmatch(pdp, match, auxp) 248 struct device *pdp; 249 void *match, *auxp; 250 { 251 struct cfdata *cfp = match; 252 253 if(strcmp("fdc", auxp) || cfp->cf_unit != 0) 254 return(0); 255 return(1); 256 } 257 258 static void 259 fdcattach(pdp, dp, auxp) 260 struct device *pdp, *dp; 261 void *auxp; 262 { 263 extern struct cfdriver fd_cd; 264 struct fd_softc fdsoftc; 265 int i, nfound, first_found; 266 267 nfound = first_found = 0; 268 printf("\n"); 269 fddeselect(); 270 for(i = 0; i < NR_DRIVES; i++) { 271 272 /* 273 * Test if unit is present 274 */ 275 fdsoftc.unit = i; 276 fdsoftc.flags = 0; 277 st_dmagrab((dma_farg)fdcint, (dma_farg)fdtestdrv, &fdsoftc, 278 &lock_stat, 0); 279 st_dmafree(&fdsoftc, &lock_stat); 280 281 if(!(fdsoftc.flags & FLPF_NOTRESP)) { 282 if(!nfound) 283 first_found = i; 284 nfound++; 285 config_found(dp, (void*)i, fdcprint); 286 } 287 } 288 289 if(nfound) { 290 291 /* 292 * Make sure motor will be turned of when a floppy is 293 * inserted in the first selected drive. 294 */ 295 fdselect(first_found, 0, FLP_DD); 296 fd_state = FLP_MON; 297 timeout((FPV)fdmotoroff, (void*)getsoftc(fd_cd,first_found), 0); 298 299 /* 300 * enable disk related interrupts 301 */ 302 MFP->mf_ierb |= IB_DINT; 303 MFP->mf_iprb &= ~IB_DINT; 304 MFP->mf_imrb |= IB_DINT; 305 } 306 } 307 308 static int 309 fdcprint(auxp, pnp) 310 void *auxp; 311 const char *pnp; 312 { 313 if (pnp != NULL) 314 printf("fd%d at %s:", (int)auxp, pnp); 315 316 return(UNCONF); 317 } 318 319 static int fdmatch __P((struct device *, void *, void *)); 320 static void fdattach __P((struct device *, struct device *, void *)); 321 322 void fdstrategy __P((struct buf *)); 323 struct dkdriver fddkdriver = { fdstrategy }; 324 325 struct cfattach fd_ca = { 326 sizeof(struct fd_softc), fdmatch, fdattach 327 }; 328 329 struct cfdriver fd_cd = { 330 NULL, "fd", DV_DISK, NULL, 0 331 }; 332 333 static int 334 fdmatch(pdp, match, auxp) 335 struct device *pdp; 336 void *match, *auxp; 337 { 338 return(1); 339 } 340 341 static void 342 fdattach(pdp, dp, auxp) 343 struct device *pdp, *dp; 344 void *auxp; 345 { 346 struct fd_softc *sc; 347 struct fd_types *type = &fdtypes[FLP_DEFTYPE]; /* XXX: switches??? */ 348 349 sc = (struct fd_softc *)dp; 350 351 printf(": %s %d cyl, %d head, %d sec\n", type->descr, 352 type->nblocks / (type->nsectors * type->nheads), type->nheads, 353 type->nsectors); 354 355 /* 356 * Initialize and attach the disk structure. 357 */ 358 sc->dkdev.dk_name = sc->sc_dv.dv_xname; 359 sc->dkdev.dk_driver = &fddkdriver; 360 disk_attach(&sc->dkdev); 361 } 362 363 int 364 fdioctl(dev, cmd, addr, flag, p) 365 dev_t dev; 366 u_long cmd; 367 int flag; 368 caddr_t addr; 369 struct proc *p; 370 { 371 struct fd_softc *sc; 372 373 sc = getsoftc(fd_cd, DISKUNIT(dev)); 374 375 if((sc->flags & FLPF_HAVELAB) == 0) 376 return(EBADF); 377 378 switch(cmd) { 379 case DIOCSBAD: 380 return(EINVAL); 381 case DIOCGDINFO: 382 *(struct disklabel *)addr = *(sc->dkdev.dk_label); 383 return(0); 384 case DIOCGPART: 385 ((struct partinfo *)addr)->disklab = 386 sc->dkdev.dk_label; 387 ((struct partinfo *)addr)->part = 388 &sc->dkdev.dk_label->d_partitions[RAW_PART]; 389 return(0); 390 #ifdef notyet /* XXX LWP */ 391 case DIOCSRETRIES: 392 case DIOCSSTEP: 393 case DIOCSDINFO: 394 case DIOCWDINFO: 395 case DIOCWLABEL: 396 #endif /* notyet */ 397 } 398 return(ENOTTY); 399 } 400 401 /* 402 * Open the device. If this is the first open on both the floppy devices, 403 * intialize the controller. 404 * Note that partition info on the floppy device is used to distinguise 405 * between 780Kb and 360Kb floppy's. 406 * partition 0: 360Kb 407 * partition 1: 780Kb 408 */ 409 int 410 fdopen(dev, flags, devtype, proc) 411 dev_t dev; 412 int flags, devtype; 413 struct proc *proc; 414 { 415 struct fd_softc *sc; 416 int sps; 417 418 #ifdef FLP_DEBUG 419 printf("fdopen dev=0x%x\n", dev); 420 #endif 421 422 if(FLP_TYPE(dev) >= NR_TYPES) 423 return(ENXIO); 424 425 if((sc = getsoftc(fd_cd, DISKUNIT(dev))) == NULL) 426 return(ENXIO); 427 428 /* 429 * If no floppy currently open, reset the controller and select 430 * floppy type. 431 */ 432 if(!nopens) { 433 434 #ifdef FLP_DEBUG 435 printf("fdopen device not yet open\n"); 436 #endif 437 nopens++; 438 write_fdreg(FDC_CS, IRUPT); 439 delay(40); 440 } 441 442 /* 443 * Sleep while other process is opening the device 444 */ 445 sps = splbio(); 446 while(sc->flags & FLPF_INOPEN) 447 tsleep((caddr_t)sc, PRIBIO, "fdopen", 0); 448 splx(sps); 449 450 if(!(sc->flags & FLPF_ISOPEN)) { 451 /* 452 * Initialise some driver values. 453 */ 454 int type; 455 void *addr; 456 457 type = FLP_TYPE(dev); 458 459 sc->bufq.b_actf = NULL; 460 sc->unit = DISKUNIT(dev); 461 sc->part = RAW_PART; 462 sc->nheads = fdtypes[type].nheads; 463 sc->nsectors = fdtypes[type].nsectors; 464 sc->nblocks = fdtypes[type].nblocks; 465 sc->density = fdtypes[type].density; 466 sc->curtrk = INV_TRK; 467 sc->sector = 0; 468 sc->errcnt = 0; 469 sc->bounceb = (u_char*)alloc_stmem(SECTOR_SIZE, &addr); 470 if(sc->bounceb == NULL) 471 return(ENOMEM); /* XXX */ 472 473 /* 474 * Go get write protect + loaded status 475 */ 476 sc->flags |= FLPF_INOPEN|FLPF_GETSTAT; 477 sps = splbio(); 478 st_dmagrab((dma_farg)fdcint, (dma_farg)fdstatus, sc, 479 &lock_stat, 0); 480 while(sc->flags & FLPF_GETSTAT) 481 tsleep((caddr_t)sc, PRIBIO, "fdopen", 0); 482 splx(sps); 483 wakeup((caddr_t)sc); 484 485 if((sc->flags & FLPF_WRTPROT) && (flags & FWRITE)) { 486 sc->flags = 0; 487 return(EPERM); 488 } 489 if(sc->flags & FLPF_EMPTY) { 490 sc->flags = 0; 491 return(ENXIO); 492 } 493 sc->flags &= ~(FLPF_INOPEN|FLPF_GETSTAT); 494 sc->flags |= FLPF_ISOPEN; 495 } 496 else { 497 /* 498 * Multiply opens are granted when accessing the same type of 499 * floppy (eq. the same partition). 500 */ 501 if(sc->density != fdtypes[DISKPART(dev)].density) 502 return(ENXIO); /* XXX temporarely out of business */ 503 } 504 fdgetdisklabel(sc, dev); 505 #ifdef FLP_DEBUG 506 printf("fdopen open succeeded on type %d\n", sc->part); 507 #endif 508 return (0); 509 } 510 511 int 512 fdclose(dev, flags, devtype, proc) 513 dev_t dev; 514 int flags, devtype; 515 struct proc *proc; 516 { 517 struct fd_softc *sc; 518 519 sc = getsoftc(fd_cd, DISKUNIT(dev)); 520 free_stmem(sc->bounceb); 521 sc->flags = 0; 522 nopens--; 523 524 #ifdef FLP_DEBUG 525 printf("Closed floppy device -- nopens: %d\n", nopens); 526 #endif 527 return(0); 528 } 529 530 void 531 fdstrategy(bp) 532 struct buf *bp; 533 { 534 struct fd_softc *sc; 535 struct disklabel *lp; 536 int sps, sz; 537 538 sc = getsoftc(fd_cd, DISKUNIT(bp->b_dev)); 539 540 #ifdef FLP_DEBUG 541 printf("fdstrategy: %p, b_bcount: %ld\n", bp, bp->b_bcount); 542 #endif 543 544 /* 545 * check for valid partition and bounds 546 */ 547 lp = sc->dkdev.dk_label; 548 if ((sc->flags & FLPF_HAVELAB) == 0) { 549 bp->b_error = EIO; 550 goto bad; 551 } 552 if (bp->b_blkno < 0 || (bp->b_bcount % SECTOR_SIZE)) { 553 bp->b_error = EINVAL; 554 goto bad; 555 } 556 if (bp->b_bcount == 0) 557 goto done; 558 559 sz = howmany(bp->b_bcount, SECTOR_SIZE); 560 561 if (bp->b_blkno + sz > sc->nblocks) { 562 sz = sc->nblocks - bp->b_blkno; 563 if (sz == 0) /* Exactly at EndOfDisk */ 564 goto done; 565 if (sz < 0) { /* Past EndOfDisk */ 566 bp->b_error = EINVAL; 567 goto bad; 568 } 569 /* Trucate it */ 570 if (bp->b_flags & B_RAW) 571 bp->b_bcount = sz << DEV_BSHIFT; 572 else bp->b_bcount = sz * lp->d_secsize; 573 } 574 575 /* 576 * queue the buf and kick the low level code 577 */ 578 sps = splbio(); 579 disksort(&sc->bufq, bp); 580 if (!lock_stat) { 581 if (fd_state & FLP_MON) 582 untimeout((FPV)fdmotoroff, (void*)sc); 583 fd_state = FLP_IDLE; 584 st_dmagrab((dma_farg)fdcint, (dma_farg)fdstart, sc, 585 &lock_stat, 0); 586 } 587 splx(sps); 588 589 return; 590 bad: 591 bp->b_flags |= B_ERROR; 592 done: 593 bp->b_resid = bp->b_bcount; 594 biodone(bp); 595 } 596 597 /* 598 * no dumps to floppy disks thank you. 599 */ 600 int 601 fddump(dev, blkno, va, size) 602 dev_t dev; 603 daddr_t blkno; 604 caddr_t va; 605 size_t size; 606 { 607 return(ENXIO); 608 } 609 610 /* 611 * no dumps to floppy disks thank you. 612 */ 613 int 614 fdsize(dev) 615 dev_t dev; 616 { 617 return(-1); 618 } 619 620 int 621 fdread(dev, uio, flags) 622 dev_t dev; 623 struct uio *uio; 624 int flags; 625 { 626 return(physio(fdstrategy, NULL, dev, B_READ, fdminphys, uio)); 627 } 628 629 int 630 fdwrite(dev, uio, flags) 631 dev_t dev; 632 struct uio *uio; 633 int flags; 634 { 635 return(physio(fdstrategy, NULL, dev, B_WRITE, fdminphys, uio)); 636 } 637 638 /* 639 * Called through DMA-dispatcher, get status. 640 */ 641 static void 642 fdstatus(sc) 643 struct fd_softc *sc; 644 { 645 #ifdef FLP_DEBUG 646 printf("fdstatus\n"); 647 #endif 648 sc->errcnt = 0; 649 fd_state = FLP_STAT; 650 fd_xfer(sc); 651 } 652 653 /* 654 * Called through the dma-dispatcher. So we know we are the only ones 655 * messing with the floppy-controler. 656 * Initialize some fields in the fdsoftc for the state-machine and get 657 * it going. 658 */ 659 static void 660 fdstart(sc) 661 struct fd_softc *sc; 662 { 663 struct buf *bp; 664 665 bp = sc->bufq.b_actf; 666 sc->sector = bp->b_blkno; /* Start sector for I/O */ 667 sc->io_data = bp->b_data; /* KVA base for I/O */ 668 sc->io_bytes = bp->b_bcount; /* Transfer size in bytes */ 669 sc->io_dir = bp->b_flags & B_READ;/* Direction of transfer */ 670 sc->errcnt = 0; /* No errors yet */ 671 fd_state = FLP_XFER; /* Yes, we're going to transfer */ 672 673 /* Instrumentation. */ 674 disk_busy(&sc->dkdev); 675 676 fd_xfer(sc); 677 } 678 679 /* 680 * The current transaction is finished (for good or bad). Let go of 681 * the the dma-resources. Call biodone() to finish the transaction. 682 * Find a new transaction to work on. 683 */ 684 static void 685 fddone(sc) 686 register struct fd_softc *sc; 687 { 688 struct buf *bp, *dp; 689 struct fd_softc *sc1; 690 int i, sps; 691 692 /* 693 * Give others a chance to use the dma. 694 */ 695 st_dmafree(sc, &lock_stat); 696 697 698 if(fd_state != FLP_STAT) { 699 /* 700 * Finish current transaction. 701 */ 702 sps = splbio(); 703 dp = &sc->bufq; 704 bp = dp->b_actf; 705 if(bp == NULL) 706 panic("fddone"); 707 dp->b_actf = bp->b_actf; 708 splx(sps); 709 710 #ifdef FLP_DEBUG 711 printf("fddone: unit: %d, buf: %p, resid: %d\n",sc->unit,bp, 712 sc->io_bytes); 713 #endif 714 bp->b_resid = sc->io_bytes; 715 716 disk_unbusy(&sc->dkdev, (bp->b_bcount - bp->b_resid)); 717 718 biodone(bp); 719 } 720 fd_state = FLP_MON; 721 722 if(lock_stat) 723 return; /* XXX Is this possible? */ 724 725 /* 726 * Find a new transaction on round-robin basis. 727 */ 728 for(i = sc->unit + 1; ;i++) { 729 if(i >= fd_cd.cd_ndevs) 730 i = 0; 731 if((sc1 = fd_cd.cd_devs[i]) == NULL) 732 continue; 733 if(sc1->bufq.b_actf) 734 break; 735 if(i == sc->unit) { 736 timeout((FPV)fdmotoroff, (void*)sc, FLP_MONDELAY); 737 #ifdef FLP_DEBUG 738 printf("fddone: Nothing to do\n"); 739 #endif 740 return; /* No work */ 741 } 742 } 743 fd_state = FLP_IDLE; 744 #ifdef FLP_DEBUG 745 printf("fddone: Staring job on unit %d\n", sc1->unit); 746 #endif 747 st_dmagrab((dma_farg)fdcint, (dma_farg)fdstart, sc1, &lock_stat, 0); 748 } 749 750 static int 751 fdselect(drive, head, dense) 752 int drive, head, dense; 753 { 754 int i, spinning; 755 #ifdef FLP_DEBUG 756 printf("fdselect: drive=%d, head=%d, dense=%d\n", drive, head, dense); 757 #endif 758 i = ((drive == 1) ? PA_FLOP1 : PA_FLOP0) | head; 759 spinning = motoron; 760 motoron = 1; 761 762 switch(dense) { 763 case FLP_DD: 764 DMA->dma_drvmode = 0; 765 break; 766 case FLP_HD: 767 DMA->dma_drvmode = (FDC_HDSET|FDC_HDSIG); 768 break; 769 default: 770 panic("fdselect: unknown density code\n"); 771 } 772 if(i != selected) { 773 selected = i; 774 ym2149_fd_select((i ^ PA_FDSEL)); 775 } 776 return(spinning); 777 } 778 779 static void 780 fddeselect() 781 { 782 ym2149_fd_select(PA_FDSEL); 783 motoron = selected = 0; 784 DMA->dma_drvmode = 0; 785 } 786 787 /**************************************************************************** 788 * The following functions assume to be running as a result of a * 789 * disk-interrupt (e.q. spl = splbio). * 790 * They form the finit-state machine, the actual driver. * 791 * * 792 * fdstart()/ --> fd_xfer() -> activate hardware * 793 * fdopen() ^ * 794 * | * 795 * +-- not ready -<------------+ * 796 * | * 797 * fdmotoroff()/ --> fdcint() -> fd_xfer_ok() ---+ * 798 * h/w interrupt | * 799 * \|/ * 800 * finished ---> fdone() * 801 * * 802 ****************************************************************************/ 803 static void 804 fd_xfer(sc) 805 struct fd_softc *sc; 806 { 807 register int head; 808 register int track, sector, hbit; 809 u_long phys_addr; 810 811 head = track = 0; 812 switch(fd_state) { 813 case FLP_XFER: 814 /* 815 * Calculate head/track values 816 */ 817 track = sc->sector / sc->nsectors; 818 head = track % sc->nheads; 819 track = track / sc->nheads; 820 #ifdef FLP_DEBUG 821 printf("fd_xfer: sector:%d,head:%d,track:%d\n", sc->sector,head, 822 track); 823 #endif 824 break; 825 826 case FLP_STAT: 827 /* 828 * FLP_STAT only wants to recalibrate 829 */ 830 sc->curtrk = INV_TRK; 831 break; 832 default: 833 panic("fd_xfer: wrong state (0x%x)", fd_state); 834 } 835 836 /* 837 * Select the drive. 838 */ 839 hbit = fdselect(sc->unit, head, sc->density) ? HBIT : 0; 840 841 if(sc->curtrk == INV_TRK) { 842 /* 843 * Recalibrate, since we lost track of head positioning. 844 * The floppy disk controller has no way of determining its 845 * absolute arm position (track). Instead, it steps the 846 * arm a track at a time and keeps track of where it 847 * thinks it is (in software). However, after a SEEK, the 848 * hardware reads information from the diskette telling 849 * where the arm actually is. If the arm is in the wrong place, 850 * a recalibration is done, which forces the arm to track 0. 851 * This way the controller can get back into sync with reality. 852 */ 853 fd_cmd = RESTORE; 854 write_fdreg(FDC_CS, RESTORE|VBIT|hbit); 855 timeout((FPV)fdmotoroff, (void*)sc, FLP_XFERDELAY); 856 857 #ifdef FLP_DEBUG 858 printf("fd_xfer:Recalibrating drive %d\n", sc->unit); 859 #endif 860 return; 861 } 862 863 write_fdreg(FDC_TR, sc->curtrk); 864 865 /* 866 * Issue a SEEK command on the indicated drive unless the arm is 867 * already positioned on the correct track. 868 */ 869 if(track != sc->curtrk) { 870 sc->curtrk = track; /* be optimistic */ 871 write_fdreg(FDC_DR, track); 872 write_fdreg(FDC_CS, SEEK|RATE6|VBIT|hbit); 873 timeout((FPV)fdmotoroff, (void*)sc, FLP_XFERDELAY); 874 fd_cmd = SEEK; 875 #ifdef FLP_DEBUG 876 printf("fd_xfer:Seek to track %d on drive %d\n",track,sc->unit); 877 #endif 878 return; 879 } 880 881 /* 882 * The drive is now on the proper track. Read or write 1 block. 883 */ 884 sector = sc->sector % sc->nsectors; 885 sector++; /* start numbering at 1 */ 886 887 write_fdreg(FDC_SR, sector); 888 889 phys_addr = (u_long)kvtop(sc->io_data); 890 if(phys_addr >= FDC_MAX_DMA_AD) { 891 /* 892 * We _must_ bounce this address 893 */ 894 phys_addr = (u_long)kvtop(sc->bounceb); 895 if(sc->io_dir == B_WRITE) 896 bcopy(sc->io_data, sc->bounceb, SECTOR_SIZE); 897 sc->flags |= FLPF_BOUNCE; 898 } 899 st_dmaaddr_set((caddr_t)phys_addr); /* DMA address setup */ 900 901 #ifdef FLP_DEBUG 902 printf("fd_xfer:Start io (io_addr:%lx)\n", (u_long)kvtop(sc->io_data)); 903 #endif 904 905 if(sc->io_dir == B_READ) { 906 /* Issue the command */ 907 st_dmacomm(DMA_FDC | DMA_SCREG, 1); 908 write_fdreg(FDC_CS, F_READ|hbit); 909 fd_cmd = F_READ; 910 } 911 else { 912 /* Issue the command */ 913 st_dmacomm(DMA_WRBIT | DMA_FDC | DMA_SCREG, 1); 914 write_fdreg(DMA_WRBIT | FDC_CS, F_WRITE|hbit|EBIT|PBIT); 915 fd_cmd = F_WRITE; 916 } 917 timeout((FPV)fdmotoroff, (void*)sc, FLP_XFERDELAY); 918 } 919 920 /* return values of fd_xfer_ok(): */ 921 #define X_OK 0 922 #define X_AGAIN 1 923 #define X_ERROR 2 924 #define X_FAIL 3 925 926 /* 927 * Hardware interrupt function. 928 */ 929 static void 930 fdcint(sc) 931 struct fd_softc *sc; 932 { 933 struct buf *bp; 934 935 #ifdef FLP_DEBUG 936 printf("fdcint: unit = %d\n", sc->unit); 937 #endif 938 939 /* 940 * Cancel timeout (we made it, didn't we) 941 */ 942 untimeout((FPV)fdmotoroff, (void*)sc); 943 944 switch(fd_xfer_ok(sc)) { 945 case X_ERROR : 946 if(++(sc->errcnt) < MAX_ERRORS) { 947 /* 948 * Command failed but still retries left. 949 */ 950 break; 951 } 952 /* FALL THROUGH */ 953 case X_FAIL : 954 /* 955 * Non recoverable error. Fall back to motor-on 956 * idle-state. 957 */ 958 if(fd_error != NULL) { 959 printf("Floppy error: %s\n", fd_error); 960 fd_error = NULL; 961 } 962 963 if(fd_state == FLP_STAT) { 964 sc->flags |= FLPF_EMPTY; 965 sc->flags &= ~FLPF_GETSTAT; 966 wakeup((caddr_t)sc); 967 fddone(sc); 968 return; 969 } 970 971 bp = sc->bufq.b_actf; 972 973 bp->b_error = EIO; 974 bp->b_flags |= B_ERROR; 975 fd_state = FLP_MON; 976 977 break; 978 case X_AGAIN: 979 /* 980 * Start next part of state machine. 981 */ 982 break; 983 case X_OK: 984 /* 985 * Command ok and finished. Reset error-counter. 986 * If there are no more bytes to transfer fall back 987 * to motor-on idle state. 988 */ 989 sc->errcnt = 0; 990 991 if(fd_state == FLP_STAT) { 992 sc->flags &= ~FLPF_GETSTAT; 993 wakeup((caddr_t)sc); 994 fddone(sc); 995 return; 996 } 997 998 if((sc->flags & FLPF_BOUNCE) && (sc->io_dir == B_READ)) 999 bcopy(sc->bounceb, sc->io_data, SECTOR_SIZE); 1000 sc->flags &= ~FLPF_BOUNCE; 1001 1002 sc->sector++; 1003 sc->io_data += SECTOR_SIZE; 1004 sc->io_bytes -= SECTOR_SIZE; 1005 if(sc->io_bytes <= 0) 1006 fd_state = FLP_MON; 1007 } 1008 if(fd_state == FLP_MON) 1009 fddone(sc); 1010 else fd_xfer(sc); 1011 } 1012 1013 /* 1014 * Determine status of last command. Should only be called through 1015 * 'fdcint()'. 1016 * Returns: 1017 * X_ERROR : Error on command; might succeed next time. 1018 * X_FAIL : Error on command; will never succeed. 1019 * X_AGAIN : Part of a command succeeded, call 'fd_xfer()' to complete. 1020 * X_OK : Command succeeded and is complete. 1021 * 1022 * This function only affects sc->curtrk. 1023 */ 1024 static int 1025 fd_xfer_ok(sc) 1026 register struct fd_softc *sc; 1027 { 1028 register int status; 1029 1030 #ifdef FLP_DEBUG 1031 printf("fd_xfer_ok: cmd: 0x%x, state: 0x%x\n", fd_cmd, fd_state); 1032 #endif 1033 switch(fd_cmd) { 1034 case IRUPT: 1035 /* 1036 * Timeout. Force a recalibrate before we try again. 1037 */ 1038 status = read_fdreg(FDC_CS); 1039 1040 fd_error = "Timeout"; 1041 sc->curtrk = INV_TRK; 1042 return(X_ERROR); 1043 case F_READ: 1044 /* 1045 * Test for DMA error 1046 */ 1047 status = read_dmastat(); 1048 if(!(status & DMAOK)) { 1049 fd_error = "Dma error"; 1050 return(X_ERROR); 1051 } 1052 /* 1053 * Get controller status and check for errors. 1054 */ 1055 status = read_fdreg(FDC_CS); 1056 if(status & (RNF | CRCERR | LD_T00)) { 1057 fd_error = "Read error"; 1058 if(status & RNF) 1059 sc->curtrk = INV_TRK; 1060 return(X_ERROR); 1061 } 1062 break; 1063 case F_WRITE: 1064 /* 1065 * Test for DMA error 1066 */ 1067 status = read_dmastat(); 1068 if(!(status & DMAOK)) { 1069 fd_error = "Dma error"; 1070 return(X_ERROR); 1071 } 1072 /* 1073 * Get controller status and check for errors. 1074 */ 1075 status = read_fdreg(FDC_CS); 1076 if(status & WRI_PRO) { 1077 fd_error = "Write protected"; 1078 return(X_FAIL); 1079 } 1080 if(status & (RNF | CRCERR | LD_T00)) { 1081 fd_error = "Write error"; 1082 sc->curtrk = INV_TRK; 1083 return(X_ERROR); 1084 } 1085 break; 1086 case SEEK: 1087 status = read_fdreg(FDC_CS); 1088 if(status & (RNF | CRCERR)) { 1089 fd_error = "Seek error"; 1090 sc->curtrk = INV_TRK; 1091 return(X_ERROR); 1092 } 1093 return(X_AGAIN); 1094 case RESTORE: 1095 /* 1096 * Determine if the recalibration succeeded. 1097 */ 1098 status = read_fdreg(FDC_CS); 1099 if(status & RNF) { 1100 fd_error = "Recalibrate error"; 1101 /* reset controller */ 1102 write_fdreg(FDC_CS, IRUPT); 1103 sc->curtrk = INV_TRK; 1104 return(X_ERROR); 1105 } 1106 sc->curtrk = 0; 1107 if(fd_state == FLP_STAT) { 1108 if(status & WRI_PRO) 1109 sc->flags |= FLPF_WRTPROT; 1110 break; 1111 } 1112 return(X_AGAIN); 1113 default: 1114 fd_error = "Driver error: fd_xfer_ok : Unknown state"; 1115 return(X_FAIL); 1116 } 1117 return(X_OK); 1118 } 1119 1120 /* 1121 * All timeouts will call this function. 1122 */ 1123 static void 1124 fdmotoroff(sc) 1125 struct fd_softc *sc; 1126 { 1127 int sps; 1128 1129 /* 1130 * Get at harware interrupt level 1131 */ 1132 sps = splbio(); 1133 1134 #if FLP_DEBUG 1135 printf("fdmotoroff, state = 0x%x\n", fd_state); 1136 #endif 1137 1138 switch(fd_state) { 1139 case FLP_STAT : 1140 case FLP_XFER : 1141 /* 1142 * Timeout during a transfer; cancel transaction 1143 * set command to 'IRUPT'. 1144 * A drive-interrupt is simulated to trigger the state 1145 * machine. 1146 */ 1147 /* 1148 * Cancel current transaction 1149 */ 1150 fd_cmd = IRUPT; 1151 write_fdreg(FDC_CS, IRUPT); 1152 delay(20); 1153 (void)read_fdreg(FDC_CS); 1154 write_fdreg(FDC_CS, RESTORE); 1155 break; 1156 1157 case FLP_MON : 1158 /* 1159 * Turn motor off. 1160 */ 1161 if(selected) { 1162 int tmp; 1163 1164 st_dmagrab((dma_farg)fdcint, (dma_farg)fdmoff, 1165 sc, &tmp, 0); 1166 } 1167 else fd_state = FLP_IDLE; 1168 break; 1169 } 1170 splx(sps); 1171 } 1172 1173 /* 1174 * min byte count to whats left of the track in question 1175 */ 1176 static void 1177 fdminphys(bp) 1178 struct buf *bp; 1179 { 1180 struct fd_softc *sc; 1181 int sec, toff, tsz; 1182 1183 if((sc = getsoftc(fd_cd, DISKUNIT(bp->b_dev))) == NULL) 1184 panic("fdminphys: couldn't get softc"); 1185 1186 sec = bp->b_blkno % (sc->nsectors * sc->nheads); 1187 toff = sec * SECTOR_SIZE; 1188 tsz = sc->nsectors * sc->nheads * SECTOR_SIZE; 1189 1190 #ifdef FLP_DEBUG 1191 printf("fdminphys: before %ld", bp->b_bcount); 1192 #endif 1193 1194 bp->b_bcount = min(bp->b_bcount, tsz - toff); 1195 1196 #ifdef FLP_DEBUG 1197 printf(" after %ld\n", bp->b_bcount); 1198 #endif 1199 1200 minphys(bp); 1201 } 1202 1203 /* 1204 * Called from fdmotoroff to turn the motor actually off.... 1205 * This can't be done in fdmotoroff itself, because exclusive access to the 1206 * DMA controller is needed to read the FDC-status register. The function 1207 * 'fdmoff()' always runs as the result of a 'dmagrab()'. 1208 * We need to test the status-register because we want to be sure that the 1209 * drive motor is really off before deselecting the drive. The FDC only 1210 * turns off the drive motor after having seen 10 index-pulses. You only 1211 * get index-pulses when a drive is selected....This means that if the 1212 * drive is deselected when the motor is still spinning, it will continue 1213 * to spin _even_ when you insert a floppy later on... 1214 */ 1215 static void 1216 fdmoff(fdsoftc) 1217 struct fd_softc *fdsoftc; 1218 { 1219 int tmp; 1220 1221 if ((fd_state == FLP_MON) && selected) { 1222 tmp = read_fdreg(FDC_CS); 1223 if (!(tmp & MOTORON)) { 1224 fddeselect(); 1225 fd_state = FLP_IDLE; 1226 } 1227 else timeout((FPV)fdmotoroff, (void*)fdsoftc, 10*FLP_MONDELAY); 1228 } 1229 st_dmafree(fdsoftc, &tmp); 1230 } 1231 1232 /* 1233 * Used to find out wich drives are actually connected. We do this by issueing 1234 * is 'RESTORE' command and check if the 'track-0' bit is set. This also works 1235 * if the drive is present but no floppy is inserted. 1236 */ 1237 static void 1238 fdtestdrv(fdsoftc) 1239 struct fd_softc *fdsoftc; 1240 { 1241 int status; 1242 1243 /* 1244 * Select the right unit and head. 1245 */ 1246 fdselect(fdsoftc->unit, 0, FLP_DD); 1247 1248 write_fdreg(FDC_CS, RESTORE|HBIT); 1249 1250 /* 1251 * Wait for about 2 seconds. 1252 */ 1253 delay(2000000); 1254 1255 status = read_fdreg(FDC_CS); 1256 if(status & (RNF|BUSY)) { 1257 write_fdreg(FDC_CS, IRUPT); /* reset controller */ 1258 delay(40); 1259 } 1260 1261 if(!(status & LD_T00)) 1262 fdsoftc->flags |= FLPF_NOTRESP; 1263 1264 fddeselect(); 1265 } 1266 1267 /* 1268 * Build disk label. For now we only create a label from what we know 1269 * from 'sc'. 1270 */ 1271 static int 1272 fdgetdisklabel(sc, dev) 1273 struct fd_softc *sc; 1274 dev_t dev; 1275 { 1276 struct disklabel *lp; 1277 int part; 1278 1279 /* 1280 * If we already got one, get out. 1281 */ 1282 if(sc->flags & FLPF_HAVELAB) 1283 return(0); 1284 1285 #ifdef FLP_DEBUG 1286 printf("fdgetdisklabel()\n"); 1287 #endif 1288 1289 part = RAW_PART; 1290 lp = sc->dkdev.dk_label; 1291 bzero(lp, sizeof(struct disklabel)); 1292 1293 lp->d_secsize = SECTOR_SIZE; 1294 lp->d_ntracks = sc->nheads; 1295 lp->d_nsectors = sc->nsectors; 1296 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 1297 lp->d_ncylinders = sc->nblocks / lp->d_secpercyl; 1298 lp->d_secperunit = sc->nblocks; 1299 1300 lp->d_type = DTYPE_FLOPPY; 1301 lp->d_rpm = 300; /* good guess I suppose. */ 1302 lp->d_interleave = 1; /* FIXME: is this OK? */ 1303 lp->d_bbsize = 0; 1304 lp->d_sbsize = 0; 1305 lp->d_npartitions = part + 1; 1306 lp->d_trkseek = STEP_DELAY; 1307 lp->d_magic = DISKMAGIC; 1308 lp->d_magic2 = DISKMAGIC; 1309 lp->d_checksum = dkcksum(lp); 1310 lp->d_partitions[part].p_size = lp->d_secperunit; 1311 lp->d_partitions[part].p_fstype = FS_UNUSED; 1312 lp->d_partitions[part].p_fsize = 1024; 1313 lp->d_partitions[part].p_frag = 8; 1314 sc->flags |= FLPF_HAVELAB; 1315 1316 return(0); 1317 } 1318
Indexes created Sun Sep 28 07:09:56 GMT 2025