1 /* $NetBSD: fd.c,v 1.42 2002/10/02 05:04:25 thorpej 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/callout.h> 54 #include <sys/kernel.h> 55 #include <sys/malloc.h> 56 #include <sys/buf.h> 57 #include <sys/proc.h> 58 #include <sys/device.h> 59 #include <sys/ioctl.h> 60 #include <sys/fcntl.h> 61 #include <sys/conf.h> 62 #include <sys/disklabel.h> 63 #include <sys/disk.h> 64 #include <sys/dkbad.h> 65 #include <atari/atari/device.h> 66 #include <atari/atari/stalloc.h> 67 #include <machine/disklabel.h> 68 #include <machine/iomap.h> 69 #include <machine/mfp.h> 70 #include <machine/dma.h> 71 #include <machine/video.h> 72 #include <machine/cpu.h> 73 #include <atari/dev/ym2149reg.h> 74 #include <atari/dev/fdreg.h> 75 76 /* 77 * Be verbose for debugging 78 */ 79 /*#define FLP_DEBUG 1 */ 80 81 #define FDC_MAX_DMA_AD 0x1000000 /* No DMA possible beyond */ 82 83 /* Parameters for the disk drive. */ 84 #define SECTOR_SIZE 512 /* physical sector size in bytes */ 85 #define NR_DRIVES 2 /* maximum number of drives */ 86 #define NR_TYPES 3 /* number of diskette/drive combinations*/ 87 #define MAX_ERRORS 10 /* how often to try rd/wt before quitting*/ 88 #define STEP_DELAY 6000 /* 6ms (6000us) delay after stepping */ 89 90 91 #define INV_TRK 32000 /* Should fit in unsigned short */ 92 #define INV_PART NR_TYPES 93 94 /* 95 * Driver states 96 */ 97 #define FLP_IDLE 0x00 /* floppy is idle */ 98 #define FLP_MON 0x01 /* idle with motor on */ 99 #define FLP_STAT 0x02 /* determine floppy status */ 100 #define FLP_XFER 0x04 /* read/write data from floppy */ 101 102 /* 103 * Timer delay's 104 */ 105 #define FLP_MONDELAY (3 * hz) /* motor-on delay */ 106 #define FLP_XFERDELAY (2 * hz) /* timeout on transfer */ 107 108 /* 109 * The density codes 110 */ 111 #define FLP_DD 0 /* Double density */ 112 #define FLP_HD 1 /* High density */ 113 114 115 #define b_block b_resid /* FIXME: this is not the place */ 116 117 /* 118 * Global data for all physical floppy devices 119 */ 120 static short selected = 0; /* drive/head currently selected*/ 121 static short motoron = 0; /* motor is spinning */ 122 static short nopens = 0; /* Number of opens executed */ 123 124 static short fd_state = FLP_IDLE; /* Current driver state */ 125 static int lock_stat= 0; /* dma locking status */ 126 static short fd_cmd = 0; /* command being executed */ 127 static char *fd_error= NULL; /* error from fd_xfer_ok() */ 128 129 /* 130 * Private per device data 131 */ 132 struct fd_softc { 133 struct device sc_dv; /* generic device info */ 134 struct disk dkdev; /* generic disk info */ 135 struct bufq_state bufq; /* queue of buf's */ 136 struct callout sc_motor_ch; 137 int unit; /* unit for atari controlling hw*/ 138 int nheads; /* number of heads in use */ 139 int nsectors; /* number of sectors/track */ 140 int density; /* density code */ 141 int nblocks; /* number of blocks on disk */ 142 int curtrk; /* track head positioned on */ 143 short flags; /* misc flags */ 144 short part; /* Current open partition */ 145 int sector; /* logical sector for I/O */ 146 caddr_t io_data; /* KVA for data transfer */ 147 int io_bytes; /* bytes left for I/O */ 148 int io_dir; /* B_READ/B_WRITE */ 149 int errcnt; /* current error count */ 150 u_char *bounceb; /* Bounce buffer */ 151 152 }; 153 154 /* 155 * Flags in fd_softc: 156 */ 157 #define FLPF_NOTRESP 0x001 /* Unit not responding */ 158 #define FLPF_ISOPEN 0x002 /* Unit is open */ 159 #define FLPF_SPARE 0x004 /* Not used */ 160 #define FLPF_HAVELAB 0x008 /* We have a valid label */ 161 #define FLPF_BOUNCE 0x010 /* Now using the bounce buffer */ 162 #define FLPF_WRTPROT 0x020 /* Unit is write-protected */ 163 #define FLPF_EMPTY 0x040 /* Unit is empty */ 164 #define FLPF_INOPEN 0x080 /* Currently being opened */ 165 #define FLPF_GETSTAT 0x100 /* Getting unit status */ 166 167 struct fd_types { 168 int nheads; /* Heads in use */ 169 int nsectors; /* sectors per track */ 170 int nblocks; /* number of blocks */ 171 int density; /* density code */ 172 const char *descr; /* type description */ 173 } fdtypes[NR_TYPES] = { 174 { 1, 9, 720 , FLP_DD , "360KB" }, /* 360 Kb */ 175 { 2, 9, 1440 , FLP_DD , "720KB" }, /* 720 Kb */ 176 { 2, 18, 2880 , FLP_HD , "1.44MB" }, /* 1.44 Mb */ 177 }; 178 179 #define FLP_TYPE_360 0 /* XXX: Please keep these in */ 180 #define FLP_TYPE_720 1 /* sync with the numbering in */ 181 #define FLP_TYPE_144 2 /* 'fdtypes' right above! */ 182 183 /* 184 * This is set only once at attach time. The value is determined by reading 185 * the configuration switches and is one of the FLP_TYPE_*'s. 186 * This is simular to the way Atari handles the _FLP cookie. 187 */ 188 static short def_type = 0; /* Reflects config-switches */ 189 190 #define FLP_DEFTYPE 1 /* 720Kb, reasonable default */ 191 #define FLP_TYPE(dev) ( DISKPART(dev) == 0 ? def_type : DISKPART(dev) - 1 ) 192 193 typedef void (*FPV) __P((void *)); 194 195 dev_type_open(fdopen); 196 dev_type_close(fdclose); 197 dev_type_read(fdread); 198 dev_type_write(fdwrite); 199 dev_type_ioctl(fdioctl); 200 dev_type_strategy(fdstrategy); 201 202 /* 203 * Private drive functions.... 204 */ 205 static void fdstart __P((struct fd_softc *)); 206 static void fddone __P((struct fd_softc *)); 207 static void fdstatus __P((struct fd_softc *)); 208 static void fd_xfer __P((struct fd_softc *)); 209 static void fdcint __P((struct fd_softc *)); 210 static int fd_xfer_ok __P((struct fd_softc *)); 211 static void fdmotoroff __P((struct fd_softc *)); 212 static void fdminphys __P((struct buf *)); 213 static void fdtestdrv __P((struct fd_softc *)); 214 static void fdgetdefaultlabel __P((struct fd_softc *, struct disklabel *, 215 int)); 216 static int fdgetdisklabel __P((struct fd_softc *, dev_t)); 217 static int fdselect __P((int, int, int)); 218 static void fddeselect __P((void)); 219 static void fdmoff __P((struct fd_softc *)); 220 u_char read_fdreg __P((u_short)); 221 void write_fdreg __P((u_short, u_short)); 222 u_char read_dmastat __P((void)); 223 224 extern __inline__ u_char read_fdreg(u_short regno) 225 { 226 DMA->dma_mode = regno; 227 return(DMA->dma_data); 228 } 229 230 extern __inline__ void write_fdreg(u_short regno, u_short val) 231 { 232 DMA->dma_mode = regno; 233 DMA->dma_data = val; 234 } 235 236 extern __inline__ u_char read_dmastat(void) 237 { 238 DMA->dma_mode = FDC_CS | DMA_SCREG; 239 return(DMA->dma_stat); 240 } 241 242 /* 243 * Config switch stuff. Used only for the floppy type for now. That's 244 * why it's here... 245 * XXX: If needed in more places, it should be moved to it's own include file. 246 * Note: This location _must_ be read as an u_short. Failure to do so 247 * will return garbage! 248 */ 249 static u_short rd_cfg_switch __P((void)); 250 static u_short rd_cfg_switch(void) 251 { 252 return(*((u_short*)AD_CFG_SWITCH)); 253 } 254 255 /* 256 * Switch definitions. 257 * Note: ON reads as a zero bit! 258 */ 259 #define CFG_SWITCH_NOHD 0x4000 260 261 /* 262 * Autoconfig stuff.... 263 */ 264 extern struct cfdriver fd_cd; 265 266 static int fdcmatch __P((struct device *, struct cfdata *, void *)); 267 static int fdcprint __P((void *, const char *)); 268 static void fdcattach __P((struct device *, struct device *, void *)); 269 270 CFATTACH_DECL(fdc, sizeof(struct device), 271 fdcmatch, fdcattach, NULL, NULL); 272 273 const struct bdevsw fd_bdevsw = { 274 fdopen, fdclose, fdstrategy, fdioctl, nodump, nosize, D_DISK 275 }; 276 277 const struct cdevsw fd_cdevsw = { 278 fdopen, fdclose, fdread, fdwrite, fdioctl, 279 nostop, notty, nopoll, nommap, D_DISK 280 }; 281 282 static int 283 fdcmatch(pdp, cfp, auxp) 284 struct device *pdp; 285 struct cfdata *cfp; 286 void *auxp; 287 { 288 static int fdc_matched = 0; 289 290 /* Match only once */ 291 if(strcmp("fdc", auxp) || fdc_matched) 292 return(0); 293 fdc_matched = 1; 294 return(1); 295 } 296 297 static void 298 fdcattach(pdp, dp, auxp) 299 struct device *pdp, *dp; 300 void *auxp; 301 { 302 struct fd_softc fdsoftc; 303 int i, nfound, first_found; 304 305 nfound = first_found = 0; 306 printf("\n"); 307 fddeselect(); 308 for(i = 0; i < NR_DRIVES; i++) { 309 310 /* 311 * Test if unit is present 312 */ 313 fdsoftc.unit = i; 314 fdsoftc.flags = 0; 315 st_dmagrab((dma_farg)fdcint, (dma_farg)fdtestdrv, &fdsoftc, 316 &lock_stat, 0); 317 st_dmafree(&fdsoftc, &lock_stat); 318 319 if(!(fdsoftc.flags & FLPF_NOTRESP)) { 320 if(!nfound) 321 first_found = i; 322 nfound++; 323 config_found(dp, (void*)i, fdcprint); 324 } 325 } 326 327 if(nfound) { 328 struct fd_softc *fdsc = getsoftc(fd_cd, first_found); 329 330 /* 331 * Make sure motor will be turned of when a floppy is 332 * inserted in the first selected drive. 333 */ 334 fdselect(first_found, 0, FLP_DD); 335 fd_state = FLP_MON; 336 callout_reset(&fdsc->sc_motor_ch, 0, (FPV)fdmotoroff, fdsc); 337 338 /* 339 * enable disk related interrupts 340 */ 341 MFP->mf_ierb |= IB_DINT; 342 MFP->mf_iprb = (u_int8_t)~IB_DINT; 343 MFP->mf_imrb |= IB_DINT; 344 } 345 } 346 347 static int 348 fdcprint(auxp, pnp) 349 void *auxp; 350 const char *pnp; 351 { 352 if (pnp != NULL) 353 printf("fd%d at %s:", (int)auxp, pnp); 354 355 return(UNCONF); 356 } 357 358 static int fdmatch __P((struct device *, struct cfdata *, void *)); 359 static void fdattach __P((struct device *, struct device *, void *)); 360 361 struct dkdriver fddkdriver = { fdstrategy }; 362 363 CFATTACH_DECL(fd, sizeof(struct fd_softc), 364 fdmatch, fdattach, NULL, NULL); 365 366 extern struct cfdriver fd_cd; 367 368 static int 369 fdmatch(pdp, cfp, auxp) 370 struct device *pdp; 371 struct cfdata *cfp; 372 void *auxp; 373 { 374 return(1); 375 } 376 377 static void 378 fdattach(pdp, dp, auxp) 379 struct device *pdp, *dp; 380 void *auxp; 381 { 382 struct fd_softc *sc; 383 struct fd_types *type; 384 u_short swtch; 385 386 sc = (struct fd_softc *)dp; 387 388 callout_init(&sc->sc_motor_ch); 389 390 /* 391 * Find out if an Ajax chip might be installed. Set the default 392 * floppy type accordingly. 393 */ 394 swtch = rd_cfg_switch(); 395 def_type = (swtch & CFG_SWITCH_NOHD) ? FLP_TYPE_720 : FLP_TYPE_144; 396 type = &fdtypes[def_type]; 397 398 printf(": %s %d cyl, %d head, %d sec\n", type->descr, 399 type->nblocks / (type->nsectors * type->nheads), type->nheads, 400 type->nsectors); 401 402 /* 403 * Initialize and attach the disk structure. 404 */ 405 sc->dkdev.dk_name = sc->sc_dv.dv_xname; 406 sc->dkdev.dk_driver = &fddkdriver; 407 disk_attach(&sc->dkdev); 408 } 409 410 int 411 fdioctl(dev, cmd, addr, flag, p) 412 dev_t dev; 413 u_long cmd; 414 int flag; 415 caddr_t addr; 416 struct proc *p; 417 { 418 struct fd_softc *sc; 419 420 sc = getsoftc(fd_cd, DISKUNIT(dev)); 421 422 if((sc->flags & FLPF_HAVELAB) == 0) 423 return(EBADF); 424 425 switch(cmd) { 426 case DIOCSBAD: 427 return(EINVAL); 428 case DIOCGDINFO: 429 *(struct disklabel *)addr = *(sc->dkdev.dk_label); 430 return(0); 431 case DIOCGPART: 432 ((struct partinfo *)addr)->disklab = 433 sc->dkdev.dk_label; 434 ((struct partinfo *)addr)->part = 435 &sc->dkdev.dk_label->d_partitions[RAW_PART]; 436 return(0); 437 #ifdef notyet /* XXX LWP */ 438 case DIOCSRETRIES: 439 case DIOCSSTEP: 440 case DIOCSDINFO: 441 case DIOCWDINFO: 442 case DIOCWLABEL: 443 break; 444 #endif /* notyet */ 445 case DIOCGDEFLABEL: 446 fdgetdefaultlabel(sc, (struct disklabel *)addr, 447 RAW_PART); 448 return(0); 449 } 450 return(ENOTTY); 451 } 452 453 /* 454 * Open the device. If this is the first open on both the floppy devices, 455 * intialize the controller. 456 * Note that partition info on the floppy device is used to distinguise 457 * between 780Kb and 360Kb floppy's. 458 * partition 0: 360Kb 459 * partition 1: 780Kb 460 */ 461 int 462 fdopen(dev, flags, devtype, proc) 463 dev_t dev; 464 int flags, devtype; 465 struct proc *proc; 466 { 467 struct fd_softc *sc; 468 int sps; 469 470 #ifdef FLP_DEBUG 471 printf("fdopen dev=0x%x\n", dev); 472 #endif 473 474 if(FLP_TYPE(dev) >= NR_TYPES) 475 return(ENXIO); 476 477 if((sc = getsoftc(fd_cd, DISKUNIT(dev))) == NULL) 478 return(ENXIO); 479 480 /* 481 * If no floppy currently open, reset the controller and select 482 * floppy type. 483 */ 484 if(!nopens) { 485 486 #ifdef FLP_DEBUG 487 printf("fdopen device not yet open\n"); 488 #endif 489 nopens++; 490 write_fdreg(FDC_CS, IRUPT); 491 delay(40); 492 } 493 494 /* 495 * Sleep while other process is opening the device 496 */ 497 sps = splbio(); 498 while(sc->flags & FLPF_INOPEN) 499 tsleep((caddr_t)sc, PRIBIO, "fdopen", 0); 500 splx(sps); 501 502 if(!(sc->flags & FLPF_ISOPEN)) { 503 /* 504 * Initialise some driver values. 505 */ 506 int type; 507 void *addr; 508 509 type = FLP_TYPE(dev); 510 511 bufq_alloc(&sc->bufq, BUFQ_DISKSORT|BUFQ_SORT_RAWBLOCK); 512 sc->unit = DISKUNIT(dev); 513 sc->part = RAW_PART; 514 sc->nheads = fdtypes[type].nheads; 515 sc->nsectors = fdtypes[type].nsectors; 516 sc->nblocks = fdtypes[type].nblocks; 517 sc->density = fdtypes[type].density; 518 sc->curtrk = INV_TRK; 519 sc->sector = 0; 520 sc->errcnt = 0; 521 sc->bounceb = (u_char*)alloc_stmem(SECTOR_SIZE, &addr); 522 if(sc->bounceb == NULL) 523 return(ENOMEM); /* XXX */ 524 525 /* 526 * Go get write protect + loaded status 527 */ 528 sc->flags |= FLPF_INOPEN|FLPF_GETSTAT; 529 sps = splbio(); 530 st_dmagrab((dma_farg)fdcint, (dma_farg)fdstatus, sc, 531 &lock_stat, 0); 532 while(sc->flags & FLPF_GETSTAT) 533 tsleep((caddr_t)sc, PRIBIO, "fdopen", 0); 534 splx(sps); 535 wakeup((caddr_t)sc); 536 537 if((sc->flags & FLPF_WRTPROT) && (flags & FWRITE)) { 538 sc->flags = 0; 539 return(EPERM); 540 } 541 if(sc->flags & FLPF_EMPTY) { 542 sc->flags = 0; 543 return(ENXIO); 544 } 545 sc->flags &= ~(FLPF_INOPEN|FLPF_GETSTAT); 546 sc->flags |= FLPF_ISOPEN; 547 } 548 else { 549 /* 550 * Multiply opens are granted when accessing the same type of 551 * floppy (eq. the same partition). 552 */ 553 if(sc->density != fdtypes[DISKPART(dev)].density) 554 return(ENXIO); /* XXX temporarely out of business */ 555 } 556 fdgetdisklabel(sc, dev); 557 #ifdef FLP_DEBUG 558 printf("fdopen open succeeded on type %d\n", sc->part); 559 #endif 560 return (0); 561 } 562 563 int 564 fdclose(dev, flags, devtype, proc) 565 dev_t dev; 566 int flags, devtype; 567 struct proc *proc; 568 { 569 struct fd_softc *sc; 570 571 sc = getsoftc(fd_cd, DISKUNIT(dev)); 572 free_stmem(sc->bounceb); 573 sc->flags = 0; 574 nopens--; 575 576 #ifdef FLP_DEBUG 577 printf("Closed floppy device -- nopens: %d\n", nopens); 578 #endif 579 return(0); 580 } 581 582 void 583 fdstrategy(bp) 584 struct buf *bp; 585 { 586 struct fd_softc *sc; 587 struct disklabel *lp; 588 int sps, sz; 589 590 sc = getsoftc(fd_cd, DISKUNIT(bp->b_dev)); 591 592 #ifdef FLP_DEBUG 593 printf("fdstrategy: %p, b_bcount: %ld\n", bp, bp->b_bcount); 594 #endif 595 596 /* 597 * check for valid partition and bounds 598 */ 599 lp = sc->dkdev.dk_label; 600 if ((sc->flags & FLPF_HAVELAB) == 0) { 601 bp->b_error = EIO; 602 goto bad; 603 } 604 if (bp->b_blkno < 0 || (bp->b_bcount % SECTOR_SIZE)) { 605 bp->b_error = EINVAL; 606 goto bad; 607 } 608 if (bp->b_bcount == 0) 609 goto done; 610 611 sz = howmany(bp->b_bcount, SECTOR_SIZE); 612 613 if (bp->b_blkno + sz > sc->nblocks) { 614 sz = sc->nblocks - bp->b_blkno; 615 if (sz == 0) /* Exactly at EndOfDisk */ 616 goto done; 617 if (sz < 0) { /* Past EndOfDisk */ 618 bp->b_error = EINVAL; 619 goto bad; 620 } 621 /* Trucate it */ 622 if (bp->b_flags & B_RAW) 623 bp->b_bcount = sz << DEV_BSHIFT; 624 else bp->b_bcount = sz * lp->d_secsize; 625 } 626 627 /* No partition translation. */ 628 bp->b_rawblkno = bp->b_blkno; 629 630 /* 631 * queue the buf and kick the low level code 632 */ 633 sps = splbio(); 634 BUFQ_PUT(&sc->bufq, bp); /* XXX disksort_cylinder */ 635 if (!lock_stat) { 636 if (fd_state & FLP_MON) 637 callout_stop(&sc->sc_motor_ch); 638 fd_state = FLP_IDLE; 639 st_dmagrab((dma_farg)fdcint, (dma_farg)fdstart, sc, 640 &lock_stat, 0); 641 } 642 splx(sps); 643 644 return; 645 bad: 646 bp->b_flags |= B_ERROR; 647 done: 648 bp->b_resid = bp->b_bcount; 649 biodone(bp); 650 } 651 652 int 653 fdread(dev, uio, flags) 654 dev_t dev; 655 struct uio *uio; 656 int flags; 657 { 658 return(physio(fdstrategy, NULL, dev, B_READ, fdminphys, uio)); 659 } 660 661 int 662 fdwrite(dev, uio, flags) 663 dev_t dev; 664 struct uio *uio; 665 int flags; 666 { 667 return(physio(fdstrategy, NULL, dev, B_WRITE, fdminphys, uio)); 668 } 669 670 /* 671 * Called through DMA-dispatcher, get status. 672 */ 673 static void 674 fdstatus(sc) 675 struct fd_softc *sc; 676 { 677 #ifdef FLP_DEBUG 678 printf("fdstatus\n"); 679 #endif 680 sc->errcnt = 0; 681 fd_state = FLP_STAT; 682 fd_xfer(sc); 683 } 684 685 /* 686 * Called through the dma-dispatcher. So we know we are the only ones 687 * messing with the floppy-controler. 688 * Initialize some fields in the fdsoftc for the state-machine and get 689 * it going. 690 */ 691 static void 692 fdstart(sc) 693 struct fd_softc *sc; 694 { 695 struct buf *bp; 696 697 bp = BUFQ_PEEK(&sc->bufq); 698 sc->sector = bp->b_blkno; /* Start sector for I/O */ 699 sc->io_data = bp->b_data; /* KVA base for I/O */ 700 sc->io_bytes = bp->b_bcount; /* Transfer size in bytes */ 701 sc->io_dir = bp->b_flags & B_READ;/* Direction of transfer */ 702 sc->errcnt = 0; /* No errors yet */ 703 fd_state = FLP_XFER; /* Yes, we're going to transfer */ 704 705 /* Instrumentation. */ 706 disk_busy(&sc->dkdev); 707 708 fd_xfer(sc); 709 } 710 711 /* 712 * The current transaction is finished (for good or bad). Let go of 713 * the dma-resources. Call biodone() to finish the transaction. 714 * Find a new transaction to work on. 715 */ 716 static void 717 fddone(sc) 718 register struct fd_softc *sc; 719 { 720 struct buf *bp; 721 struct fd_softc *sc1; 722 int i, sps; 723 724 /* 725 * Give others a chance to use the dma. 726 */ 727 st_dmafree(sc, &lock_stat); 728 729 730 if(fd_state != FLP_STAT) { 731 /* 732 * Finish current transaction. 733 */ 734 sps = splbio(); 735 bp = BUFQ_GET(&sc->bufq); 736 if (bp == NULL) 737 panic("fddone"); 738 splx(sps); 739 740 #ifdef FLP_DEBUG 741 printf("fddone: unit: %d, buf: %p, resid: %d\n",sc->unit,bp, 742 sc->io_bytes); 743 #endif 744 bp->b_resid = sc->io_bytes; 745 746 disk_unbusy(&sc->dkdev, (bp->b_bcount - bp->b_resid)); 747 748 biodone(bp); 749 } 750 fd_state = FLP_MON; 751 752 if(lock_stat) 753 return; /* XXX Is this possible? */ 754 755 /* 756 * Find a new transaction on round-robin basis. 757 */ 758 for(i = sc->unit + 1; ;i++) { 759 if(i >= fd_cd.cd_ndevs) 760 i = 0; 761 if((sc1 = fd_cd.cd_devs[i]) == NULL) 762 continue; 763 if (BUFQ_PEEK(&sc1->bufq) != NULL) 764 break; 765 if(i == sc->unit) { 766 callout_reset(&sc->sc_motor_ch, FLP_MONDELAY, 767 (FPV)fdmotoroff, sc); 768 #ifdef FLP_DEBUG 769 printf("fddone: Nothing to do\n"); 770 #endif 771 return; /* No work */ 772 } 773 } 774 fd_state = FLP_IDLE; 775 #ifdef FLP_DEBUG 776 printf("fddone: Staring job on unit %d\n", sc1->unit); 777 #endif 778 st_dmagrab((dma_farg)fdcint, (dma_farg)fdstart, sc1, &lock_stat, 0); 779 } 780 781 static int 782 fdselect(drive, head, dense) 783 int drive, head, dense; 784 { 785 int i, spinning; 786 #ifdef FLP_DEBUG 787 printf("fdselect: drive=%d, head=%d, dense=%d\n", drive, head, dense); 788 #endif 789 i = ((drive == 1) ? PA_FLOP1 : PA_FLOP0) | head; 790 spinning = motoron; 791 motoron = 1; 792 793 switch(dense) { 794 case FLP_DD: 795 DMA->dma_drvmode = 0; 796 break; 797 case FLP_HD: 798 DMA->dma_drvmode = (FDC_HDSET|FDC_HDSIG); 799 break; 800 default: 801 panic("fdselect: unknown density code"); 802 } 803 if(i != selected) { 804 selected = i; 805 ym2149_fd_select((i ^ PA_FDSEL)); 806 } 807 return(spinning); 808 } 809 810 static void 811 fddeselect() 812 { 813 ym2149_fd_select(PA_FDSEL); 814 motoron = selected = 0; 815 DMA->dma_drvmode = 0; 816 } 817 818 /**************************************************************************** 819 * The following functions assume to be running as a result of a * 820 * disk-interrupt (e.q. spl = splbio). * 821 * They form the finit-state machine, the actual driver. * 822 * * 823 * fdstart()/ --> fd_xfer() -> activate hardware * 824 * fdopen() ^ * 825 * | * 826 * +-- not ready -<------------+ * 827 * | * 828 * fdmotoroff()/ --> fdcint() -> fd_xfer_ok() ---+ * 829 * h/w interrupt | * 830 * \|/ * 831 * finished ---> fdone() * 832 * * 833 ****************************************************************************/ 834 static void 835 fd_xfer(sc) 836 struct fd_softc *sc; 837 { 838 register int head; 839 register int track, sector, hbit; 840 u_long phys_addr; 841 842 head = track = 0; 843 switch(fd_state) { 844 case FLP_XFER: 845 /* 846 * Calculate head/track values 847 */ 848 track = sc->sector / sc->nsectors; 849 head = track % sc->nheads; 850 track = track / sc->nheads; 851 #ifdef FLP_DEBUG 852 printf("fd_xfer: sector:%d,head:%d,track:%d\n", sc->sector,head, 853 track); 854 #endif 855 break; 856 857 case FLP_STAT: 858 /* 859 * FLP_STAT only wants to recalibrate 860 */ 861 sc->curtrk = INV_TRK; 862 break; 863 default: 864 panic("fd_xfer: wrong state (0x%x)", fd_state); 865 } 866 867 /* 868 * Select the drive. 869 */ 870 hbit = fdselect(sc->unit, head, sc->density) ? HBIT : 0; 871 872 if(sc->curtrk == INV_TRK) { 873 /* 874 * Recalibrate, since we lost track of head positioning. 875 * The floppy disk controller has no way of determining its 876 * absolute arm position (track). Instead, it steps the 877 * arm a track at a time and keeps track of where it 878 * thinks it is (in software). However, after a SEEK, the 879 * hardware reads information from the diskette telling 880 * where the arm actually is. If the arm is in the wrong place, 881 * a recalibration is done, which forces the arm to track 0. 882 * This way the controller can get back into sync with reality. 883 */ 884 fd_cmd = RESTORE; 885 write_fdreg(FDC_CS, RESTORE|VBIT|hbit); 886 callout_reset(&sc->sc_motor_ch, FLP_XFERDELAY, 887 (FPV)fdmotoroff, sc); 888 889 #ifdef FLP_DEBUG 890 printf("fd_xfer:Recalibrating drive %d\n", sc->unit); 891 #endif 892 return; 893 } 894 895 write_fdreg(FDC_TR, sc->curtrk); 896 897 /* 898 * Issue a SEEK command on the indicated drive unless the arm is 899 * already positioned on the correct track. 900 */ 901 if(track != sc->curtrk) { 902 sc->curtrk = track; /* be optimistic */ 903 write_fdreg(FDC_DR, track); 904 write_fdreg(FDC_CS, SEEK|RATE6|VBIT|hbit); 905 callout_reset(&sc->sc_motor_ch, FLP_XFERDELAY, 906 (FPV)fdmotoroff, sc); 907 fd_cmd = SEEK; 908 #ifdef FLP_DEBUG 909 printf("fd_xfer:Seek to track %d on drive %d\n",track,sc->unit); 910 #endif 911 return; 912 } 913 914 /* 915 * The drive is now on the proper track. Read or write 1 block. 916 */ 917 sector = sc->sector % sc->nsectors; 918 sector++; /* start numbering at 1 */ 919 920 write_fdreg(FDC_SR, sector); 921 922 phys_addr = (u_long)kvtop(sc->io_data); 923 if(phys_addr >= FDC_MAX_DMA_AD) { 924 /* 925 * We _must_ bounce this address 926 */ 927 phys_addr = (u_long)kvtop(sc->bounceb); 928 if(sc->io_dir == B_WRITE) 929 bcopy(sc->io_data, sc->bounceb, SECTOR_SIZE); 930 sc->flags |= FLPF_BOUNCE; 931 } 932 st_dmaaddr_set((caddr_t)phys_addr); /* DMA address setup */ 933 934 #ifdef FLP_DEBUG 935 printf("fd_xfer:Start io (io_addr:%lx)\n", (u_long)kvtop(sc->io_data)); 936 #endif 937 938 if(sc->io_dir == B_READ) { 939 /* Issue the command */ 940 st_dmacomm(DMA_FDC | DMA_SCREG, 1); 941 write_fdreg(FDC_CS, F_READ|hbit); 942 fd_cmd = F_READ; 943 } 944 else { 945 /* Issue the command */ 946 st_dmacomm(DMA_WRBIT | DMA_FDC | DMA_SCREG, 1); 947 write_fdreg(DMA_WRBIT | FDC_CS, F_WRITE|hbit|EBIT|PBIT); 948 fd_cmd = F_WRITE; 949 } 950 callout_reset(&sc->sc_motor_ch, FLP_XFERDELAY, (FPV)fdmotoroff, sc); 951 } 952 953 /* return values of fd_xfer_ok(): */ 954 #define X_OK 0 955 #define X_AGAIN 1 956 #define X_ERROR 2 957 #define X_FAIL 3 958 959 /* 960 * Hardware interrupt function. 961 */ 962 static void 963 fdcint(sc) 964 struct fd_softc *sc; 965 { 966 struct buf *bp; 967 968 #ifdef FLP_DEBUG 969 printf("fdcint: unit = %d\n", sc->unit); 970 #endif 971 972 /* 973 * Cancel timeout (we made it, didn't we) 974 */ 975 callout_stop(&sc->sc_motor_ch); 976 977 switch(fd_xfer_ok(sc)) { 978 case X_ERROR : 979 if(++(sc->errcnt) < MAX_ERRORS) { 980 /* 981 * Command failed but still retries left. 982 */ 983 break; 984 } 985 /* FALL THROUGH */ 986 case X_FAIL : 987 /* 988 * Non recoverable error. Fall back to motor-on 989 * idle-state. 990 */ 991 if(fd_error != NULL) { 992 printf("Floppy error: %s\n", fd_error); 993 fd_error = NULL; 994 } 995 996 if(fd_state == FLP_STAT) { 997 sc->flags |= FLPF_EMPTY; 998 sc->flags &= ~FLPF_GETSTAT; 999 wakeup((caddr_t)sc); 1000 fddone(sc); 1001 return; 1002 } 1003 1004 bp = BUFQ_PEEK(&sc->bufq); 1005 1006 bp->b_error = EIO; 1007 bp->b_flags |= B_ERROR; 1008 fd_state = FLP_MON; 1009 1010 break; 1011 case X_AGAIN: 1012 /* 1013 * Start next part of state machine. 1014 */ 1015 break; 1016 case X_OK: 1017 /* 1018 * Command ok and finished. Reset error-counter. 1019 * If there are no more bytes to transfer fall back 1020 * to motor-on idle state. 1021 */ 1022 sc->errcnt = 0; 1023 1024 if(fd_state == FLP_STAT) { 1025 sc->flags &= ~FLPF_GETSTAT; 1026 wakeup((caddr_t)sc); 1027 fddone(sc); 1028 return; 1029 } 1030 1031 if((sc->flags & FLPF_BOUNCE) && (sc->io_dir == B_READ)) 1032 bcopy(sc->bounceb, sc->io_data, SECTOR_SIZE); 1033 sc->flags &= ~FLPF_BOUNCE; 1034 1035 sc->sector++; 1036 sc->io_data += SECTOR_SIZE; 1037 sc->io_bytes -= SECTOR_SIZE; 1038 if(sc->io_bytes <= 0) 1039 fd_state = FLP_MON; 1040 } 1041 if(fd_state == FLP_MON) 1042 fddone(sc); 1043 else fd_xfer(sc); 1044 } 1045 1046 /* 1047 * Determine status of last command. Should only be called through 1048 * 'fdcint()'. 1049 * Returns: 1050 * X_ERROR : Error on command; might succeed next time. 1051 * X_FAIL : Error on command; will never succeed. 1052 * X_AGAIN : Part of a command succeeded, call 'fd_xfer()' to complete. 1053 * X_OK : Command succeeded and is complete. 1054 * 1055 * This function only affects sc->curtrk. 1056 */ 1057 static int 1058 fd_xfer_ok(sc) 1059 register struct fd_softc *sc; 1060 { 1061 register int status; 1062 1063 #ifdef FLP_DEBUG 1064 printf("fd_xfer_ok: cmd: 0x%x, state: 0x%x\n", fd_cmd, fd_state); 1065 #endif 1066 switch(fd_cmd) { 1067 case IRUPT: 1068 /* 1069 * Timeout. Force a recalibrate before we try again. 1070 */ 1071 status = read_fdreg(FDC_CS); 1072 1073 fd_error = "Timeout"; 1074 sc->curtrk = INV_TRK; 1075 return(X_ERROR); 1076 case F_READ: 1077 /* 1078 * Test for DMA error 1079 */ 1080 status = read_dmastat(); 1081 if(!(status & DMAOK)) { 1082 fd_error = "Dma error"; 1083 return(X_ERROR); 1084 } 1085 /* 1086 * Get controller status and check for errors. 1087 */ 1088 status = read_fdreg(FDC_CS); 1089 if(status & (RNF | CRCERR | LD_T00)) { 1090 fd_error = "Read error"; 1091 if(status & RNF) 1092 sc->curtrk = INV_TRK; 1093 return(X_ERROR); 1094 } 1095 break; 1096 case F_WRITE: 1097 /* 1098 * Test for DMA error 1099 */ 1100 status = read_dmastat(); 1101 if(!(status & DMAOK)) { 1102 fd_error = "Dma error"; 1103 return(X_ERROR); 1104 } 1105 /* 1106 * Get controller status and check for errors. 1107 */ 1108 status = read_fdreg(FDC_CS); 1109 if(status & WRI_PRO) { 1110 fd_error = "Write protected"; 1111 return(X_FAIL); 1112 } 1113 if(status & (RNF | CRCERR | LD_T00)) { 1114 fd_error = "Write error"; 1115 sc->curtrk = INV_TRK; 1116 return(X_ERROR); 1117 } 1118 break; 1119 case SEEK: 1120 status = read_fdreg(FDC_CS); 1121 if(status & (RNF | CRCERR)) { 1122 fd_error = "Seek error"; 1123 sc->curtrk = INV_TRK; 1124 return(X_ERROR); 1125 } 1126 return(X_AGAIN); 1127 case RESTORE: 1128 /* 1129 * Determine if the recalibration succeeded. 1130 */ 1131 status = read_fdreg(FDC_CS); 1132 if(status & RNF) { 1133 fd_error = "Recalibrate error"; 1134 /* reset controller */ 1135 write_fdreg(FDC_CS, IRUPT); 1136 sc->curtrk = INV_TRK; 1137 return(X_ERROR); 1138 } 1139 sc->curtrk = 0; 1140 if(fd_state == FLP_STAT) { 1141 if(status & WRI_PRO) 1142 sc->flags |= FLPF_WRTPROT; 1143 break; 1144 } 1145 return(X_AGAIN); 1146 default: 1147 fd_error = "Driver error: fd_xfer_ok : Unknown state"; 1148 return(X_FAIL); 1149 } 1150 return(X_OK); 1151 } 1152 1153 /* 1154 * All timeouts will call this function. 1155 */ 1156 static void 1157 fdmotoroff(sc) 1158 struct fd_softc *sc; 1159 { 1160 int sps; 1161 1162 /* 1163 * Get at harware interrupt level 1164 */ 1165 sps = splbio(); 1166 1167 #if FLP_DEBUG 1168 printf("fdmotoroff, state = 0x%x\n", fd_state); 1169 #endif 1170 1171 switch(fd_state) { 1172 case FLP_STAT : 1173 case FLP_XFER : 1174 /* 1175 * Timeout during a transfer; cancel transaction 1176 * set command to 'IRUPT'. 1177 * A drive-interrupt is simulated to trigger the state 1178 * machine. 1179 */ 1180 /* 1181 * Cancel current transaction 1182 */ 1183 fd_cmd = IRUPT; 1184 write_fdreg(FDC_CS, IRUPT); 1185 delay(20); 1186 (void)read_fdreg(FDC_CS); 1187 write_fdreg(FDC_CS, RESTORE); 1188 break; 1189 1190 case FLP_MON : 1191 /* 1192 * Turn motor off. 1193 */ 1194 if(selected) { 1195 int tmp; 1196 1197 st_dmagrab((dma_farg)fdcint, (dma_farg)fdmoff, 1198 sc, &tmp, 0); 1199 } 1200 else fd_state = FLP_IDLE; 1201 break; 1202 } 1203 splx(sps); 1204 } 1205 1206 /* 1207 * min byte count to whats left of the track in question 1208 */ 1209 static void 1210 fdminphys(bp) 1211 struct buf *bp; 1212 { 1213 struct fd_softc *sc; 1214 int sec, toff, tsz; 1215 1216 if((sc = getsoftc(fd_cd, DISKUNIT(bp->b_dev))) == NULL) 1217 panic("fdminphys: couldn't get softc"); 1218 1219 sec = bp->b_blkno % (sc->nsectors * sc->nheads); 1220 toff = sec * SECTOR_SIZE; 1221 tsz = sc->nsectors * sc->nheads * SECTOR_SIZE; 1222 1223 #ifdef FLP_DEBUG 1224 printf("fdminphys: before %ld", bp->b_bcount); 1225 #endif 1226 1227 bp->b_bcount = min(bp->b_bcount, tsz - toff); 1228 1229 #ifdef FLP_DEBUG 1230 printf(" after %ld\n", bp->b_bcount); 1231 #endif 1232 1233 minphys(bp); 1234 } 1235 1236 /* 1237 * Called from fdmotoroff to turn the motor actually off.... 1238 * This can't be done in fdmotoroff itself, because exclusive access to the 1239 * DMA controller is needed to read the FDC-status register. The function 1240 * 'fdmoff()' always runs as the result of a 'dmagrab()'. 1241 * We need to test the status-register because we want to be sure that the 1242 * drive motor is really off before deselecting the drive. The FDC only 1243 * turns off the drive motor after having seen 10 index-pulses. You only 1244 * get index-pulses when a drive is selected....This means that if the 1245 * drive is deselected when the motor is still spinning, it will continue 1246 * to spin _even_ when you insert a floppy later on... 1247 */ 1248 static void 1249 fdmoff(fdsoftc) 1250 struct fd_softc *fdsoftc; 1251 { 1252 int tmp; 1253 1254 if ((fd_state == FLP_MON) && selected) { 1255 tmp = read_fdreg(FDC_CS); 1256 if (!(tmp & MOTORON)) { 1257 fddeselect(); 1258 fd_state = FLP_IDLE; 1259 } 1260 else 1261 callout_reset(&fdsoftc->sc_motor_ch, 10*FLP_MONDELAY, 1262 (FPV)fdmotoroff, fdsoftc); 1263 } 1264 st_dmafree(fdsoftc, &tmp); 1265 } 1266 1267 /* 1268 * Used to find out wich drives are actually connected. We do this by issuing 1269 * is 'RESTORE' command and check if the 'track-0' bit is set. This also works 1270 * if the drive is present but no floppy is inserted. 1271 */ 1272 static void 1273 fdtestdrv(fdsoftc) 1274 struct fd_softc *fdsoftc; 1275 { 1276 int status; 1277 1278 /* 1279 * Select the right unit and head. 1280 */ 1281 fdselect(fdsoftc->unit, 0, FLP_DD); 1282 1283 write_fdreg(FDC_CS, RESTORE|HBIT); 1284 1285 /* 1286 * Wait for about 2 seconds. 1287 */ 1288 delay(2000000); 1289 1290 status = read_fdreg(FDC_CS); 1291 if(status & (RNF|BUSY)) { 1292 write_fdreg(FDC_CS, IRUPT); /* reset controller */ 1293 delay(40); 1294 } 1295 1296 if(!(status & LD_T00)) 1297 fdsoftc->flags |= FLPF_NOTRESP; 1298 1299 fddeselect(); 1300 } 1301 1302 static void 1303 fdgetdefaultlabel(sc, lp, part) 1304 struct fd_softc *sc; 1305 struct disklabel *lp; 1306 int part; 1307 { 1308 1309 bzero(lp, sizeof(struct disklabel)); 1310 1311 lp->d_secsize = SECTOR_SIZE; 1312 lp->d_ntracks = sc->nheads; 1313 lp->d_nsectors = sc->nsectors; 1314 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 1315 lp->d_ncylinders = sc->nblocks / lp->d_secpercyl; 1316 lp->d_secperunit = sc->nblocks; 1317 1318 lp->d_type = DTYPE_FLOPPY; 1319 lp->d_rpm = 300; /* good guess I suppose. */ 1320 lp->d_interleave = 1; /* FIXME: is this OK? */ 1321 lp->d_bbsize = 0; 1322 lp->d_sbsize = 0; 1323 lp->d_npartitions = part + 1; 1324 lp->d_trkseek = STEP_DELAY; 1325 lp->d_magic = DISKMAGIC; 1326 lp->d_magic2 = DISKMAGIC; 1327 lp->d_checksum = dkcksum(lp); 1328 lp->d_partitions[part].p_size = lp->d_secperunit; 1329 lp->d_partitions[part].p_fstype = FS_UNUSED; 1330 lp->d_partitions[part].p_fsize = 1024; 1331 lp->d_partitions[part].p_frag = 8; 1332 } 1333 1334 /* 1335 * Build disk label. For now we only create a label from what we know 1336 * from 'sc'. 1337 */ 1338 static int 1339 fdgetdisklabel(sc, dev) 1340 struct fd_softc *sc; 1341 dev_t dev; 1342 { 1343 struct disklabel *lp; 1344 int part; 1345 1346 /* 1347 * If we already got one, get out. 1348 */ 1349 if(sc->flags & FLPF_HAVELAB) 1350 return(0); 1351 1352 #ifdef FLP_DEBUG 1353 printf("fdgetdisklabel()\n"); 1354 #endif 1355 1356 part = RAW_PART; 1357 lp = sc->dkdev.dk_label; 1358 fdgetdefaultlabel(sc, lp, part); 1359 sc->flags |= FLPF_HAVELAB; 1360 1361 return(0); 1362 } 1363