1 /* $NetBSD: fd.c,v 1.76 2010/04/13 11:31:11 tsutsui 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 /* 29 * This file contains a driver for the Floppy Disk Controller (FDC) 30 * on the Atari TT. It uses the WD 1772 chip, modified for steprates. 31 * 32 * The ST floppy disk controller shares the access to the DMA circuitry 33 * with other devices. For this reason the floppy disk controller makes 34 * use of some special DMA accessing code. 35 * 36 * Interrupts from the FDC are in fact DMA interrupts which get their 37 * first level handling in 'dma.c' . If the floppy driver is currently 38 * using DMA the interrupt is signalled to 'fdcint'. 39 * 40 * TODO: 41 * - Test it with 2 drives (I don't have them) 42 * - Test it with an HD-drive (Don't have that either) 43 * - Finish ioctl's 44 */ 45 46 #include <sys/cdefs.h> 47 __KERNEL_RCSID(0, "$NetBSD: fd.c,v 1.76 2010/04/13 11:31:11 tsutsui Exp $"); 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/callout.h> 52 #include <sys/kernel.h> 53 #include <sys/malloc.h> 54 #include <sys/buf.h> 55 #include <sys/bufq.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 #include "ioconf.h" 76 77 /* 78 * Be verbose for debugging 79 */ 80 /*#define FLP_DEBUG 1 */ 81 82 #define FDC_MAX_DMA_AD 0x1000000 /* No DMA possible beyond */ 83 84 /* Parameters for the disk drive. */ 85 #define SECTOR_SIZE 512 /* physical sector size in bytes */ 86 #define NR_DRIVES 2 /* maximum number of drives */ 87 #define NR_TYPES 3 /* number of diskette/drive combinations*/ 88 #define MAX_ERRORS 10 /* how often to try rd/wt before quitting*/ 89 #define STEP_DELAY 6000 /* 6ms (6000us) delay after stepping */ 90 91 92 #define INV_TRK 32000 /* Should fit in unsigned short */ 93 #define INV_PART NR_TYPES 94 95 /* 96 * Driver states 97 */ 98 #define FLP_IDLE 0x00 /* floppy is idle */ 99 #define FLP_MON 0x01 /* idle with motor on */ 100 #define FLP_STAT 0x02 /* determine floppy status */ 101 #define FLP_XFER 0x04 /* read/write data from floppy */ 102 103 /* 104 * Timer delay's 105 */ 106 #define FLP_MONDELAY (3 * hz) /* motor-on delay */ 107 #define FLP_XFERDELAY (2 * hz) /* timeout on transfer */ 108 109 /* 110 * The density codes 111 */ 112 #define FLP_DD 0 /* Double density */ 113 #define FLP_HD 1 /* High density */ 114 115 116 #define b_block b_resid /* FIXME: this is not the place */ 117 118 /* 119 * Global data for all physical floppy devices 120 */ 121 static short selected = 0; /* drive/head currently selected*/ 122 static short motoron = 0; /* motor is spinning */ 123 static short nopens = 0; /* Number of opens executed */ 124 125 static short fd_state = FLP_IDLE; /* Current driver state */ 126 static int lock_stat = 0; /* DMA locking status */ 127 static short fd_cmd = 0; /* command being executed */ 128 static const char *fd_error = NULL; /* error from fd_xfer_ok() */ 129 130 /* 131 * Private per device data 132 */ 133 struct fd_softc { 134 device_t sc_dev; /* generic device info */ 135 struct disk dkdev; /* generic disk info */ 136 struct bufq_state *bufq; /* queue of buf's */ 137 struct callout sc_motor_ch; 138 int unit; /* unit for atari controlling hw*/ 139 int nheads; /* number of heads in use */ 140 int nsectors; /* number of sectors/track */ 141 int density; /* density code */ 142 int nblocks; /* number of blocks on disk */ 143 int curtrk; /* track head positioned on */ 144 short flags; /* misc flags */ 145 short part; /* Current open partition */ 146 int sector; /* logical sector for I/O */ 147 uint8_t *io_data; /* KVA for data transfer */ 148 int io_bytes; /* bytes left for I/O */ 149 int io_dir; /* B_READ/B_WRITE */ 150 int errcnt; /* current error count */ 151 uint8_t *bounceb; /* Bounce buffer */ 152 153 }; 154 155 /* 156 * Flags in fd_softc: 157 */ 158 #define FLPF_NOTRESP 0x001 /* Unit not responding */ 159 #define FLPF_ISOPEN 0x002 /* Unit is open */ 160 #define FLPF_SPARE 0x004 /* Not used */ 161 #define FLPF_HAVELAB 0x008 /* We have a valid label */ 162 #define FLPF_BOUNCE 0x010 /* Now using the bounce buffer */ 163 #define FLPF_WRTPROT 0x020 /* Unit is write-protected */ 164 #define FLPF_EMPTY 0x040 /* Unit is empty */ 165 #define FLPF_INOPEN 0x080 /* Currently being opened */ 166 #define FLPF_GETSTAT 0x100 /* Getting unit status */ 167 168 struct fd_types { 169 int nheads; /* Heads in use */ 170 int nsectors; /* sectors per track */ 171 int nblocks; /* number of blocks */ 172 int density; /* density code */ 173 const char *descr; /* type description */ 174 } fdtypes[NR_TYPES] = { 175 { 1, 9, 720 , FLP_DD , "360KB" }, /* 360 Kb */ 176 { 2, 9, 1440 , FLP_DD , "720KB" }, /* 720 Kb */ 177 { 2, 18, 2880 , FLP_HD , "1.44MB" }, /* 1.44 Mb */ 178 }; 179 180 #define FLP_TYPE_360 0 /* XXX: Please keep these in */ 181 #define FLP_TYPE_720 1 /* sync with the numbering in */ 182 #define FLP_TYPE_144 2 /* 'fdtypes' right above! */ 183 184 /* 185 * This is set only once at attach time. The value is determined by reading 186 * the configuration switches and is one of the FLP_TYPE_*'s. 187 * This is simular to the way Atari handles the _FLP cookie. 188 */ 189 static short def_type = 0; /* Reflects config-switches */ 190 191 #define FLP_DEFTYPE 1 /* 720Kb, reasonable default */ 192 #define FLP_TYPE(dev) ( DISKPART(dev) == 0 ? def_type : DISKPART(dev) - 1 ) 193 194 typedef void (*FPV)(void *); 195 196 dev_type_open(fdopen); 197 dev_type_close(fdclose); 198 dev_type_read(fdread); 199 dev_type_write(fdwrite); 200 dev_type_ioctl(fdioctl); 201 dev_type_strategy(fdstrategy); 202 203 /* 204 * Private drive functions.... 205 */ 206 static void fdstart(struct fd_softc *); 207 static void fddone(struct fd_softc *); 208 static void fdstatus(struct fd_softc *); 209 static void fd_xfer(struct fd_softc *); 210 static void fdcint(struct fd_softc *); 211 static int fd_xfer_ok(struct fd_softc *); 212 static void fdmotoroff(struct fd_softc *); 213 static void fdminphys(struct buf *); 214 static void fdtestdrv(struct fd_softc *); 215 static void fdgetdefaultlabel(struct fd_softc *, struct disklabel *, 216 int); 217 static int fdgetdisklabel(struct fd_softc *, dev_t); 218 static int fdselect(int, int, int); 219 static void fddeselect(void); 220 static void fdmoff(struct fd_softc *); 221 222 static u_short rd_cfg_switch(void); 223 224 static inline uint8_t read_fdreg(u_short); 225 static inline void write_fdreg(u_short, u_short); 226 static inline uint8_t read_dmastat(void); 227 228 static inline 229 uint8_t read_fdreg(u_short regno) 230 { 231 232 DMA->dma_mode = regno; 233 return DMA->dma_data; 234 } 235 236 static inline 237 void write_fdreg(u_short regno, u_short val) 238 { 239 240 DMA->dma_mode = regno; 241 DMA->dma_data = val; 242 } 243 244 static inline 245 uint8_t read_dmastat(void) 246 { 247 248 DMA->dma_mode = FDC_CS | DMA_SCREG; 249 return DMA->dma_stat; 250 } 251 252 /* 253 * Config switch stuff. Used only for the floppy type for now. That's 254 * why it's here... 255 * XXX: If needed in more places, it should be moved to it's own include file. 256 * Note: This location _must_ be read as an u_short. Failure to do so 257 * will return garbage! 258 */ 259 static u_short 260 rd_cfg_switch(void) 261 { 262 263 return *(volatile u_short *)AD_CFG_SWITCH; 264 } 265 266 /* 267 * Switch definitions. 268 * Note: ON reads as a zero bit! 269 */ 270 #define CFG_SWITCH_NOHD 0x4000 271 272 /* 273 * Autoconfig stuff.... 274 */ 275 static int fdcmatch(device_t, cfdata_t, void *); 276 static int fdcprint(void *, const char *); 277 static void fdcattach(device_t, device_t, void *); 278 279 CFATTACH_DECL_NEW(fdc, 0, 280 fdcmatch, fdcattach, NULL, NULL); 281 282 const struct bdevsw fd_bdevsw = { 283 fdopen, fdclose, fdstrategy, fdioctl, nodump, nosize, D_DISK 284 }; 285 286 const struct cdevsw fd_cdevsw = { 287 fdopen, fdclose, fdread, fdwrite, fdioctl, 288 nostop, notty, nopoll, nommap, nokqfilter, D_DISK 289 }; 290 291 static int 292 fdcmatch(device_t parent, cfdata_t match, void *aux) 293 { 294 static int fdc_matched = 0; 295 296 /* Match only once */ 297 if (strcmp("fdc", aux) || fdc_matched) 298 return 0; 299 fdc_matched = 1; 300 return 1; 301 } 302 303 static void 304 fdcattach(device_t parent, device_t self, void *aux) 305 { 306 struct fd_softc fdsoftc; 307 int i, nfound, first_found; 308 309 nfound = first_found = 0; 310 printf("\n"); 311 fddeselect(); 312 for (i = 0; i < NR_DRIVES; i++) { 313 314 /* 315 * Test if unit is present 316 */ 317 fdsoftc.unit = i; 318 fdsoftc.flags = 0; 319 st_dmagrab((dma_farg)fdcint, (dma_farg)fdtestdrv, &fdsoftc, 320 &lock_stat, 0); 321 st_dmafree(&fdsoftc, &lock_stat); 322 323 if ((fdsoftc.flags & FLPF_NOTRESP) == 0) { 324 if (nfound == 0) 325 first_found = i; 326 nfound++; 327 config_found(self, (void *)i, fdcprint); 328 } 329 } 330 331 if (nfound != 0) { 332 struct fd_softc *fdsc = 333 device_lookup_private(&fd_cd, first_found); 334 335 /* 336 * Make sure motor will be turned of when a floppy is 337 * inserted in the first selected drive. 338 */ 339 fdselect(first_found, 0, FLP_DD); 340 fd_state = FLP_MON; 341 callout_reset(&fdsc->sc_motor_ch, 0, (FPV)fdmotoroff, fdsc); 342 343 /* 344 * enable disk related interrupts 345 */ 346 MFP->mf_ierb |= IB_DINT; 347 MFP->mf_iprb = (uint8_t)~IB_DINT; 348 MFP->mf_imrb |= IB_DINT; 349 } 350 } 351 352 static int 353 fdcprint(void *aux, const char *pnp) 354 { 355 356 if (pnp != NULL) 357 aprint_normal("fd%d at %s:", (int)aux, pnp); 358 359 return UNCONF; 360 } 361 362 static int fdmatch(device_t, cfdata_t, void *); 363 static void fdattach(device_t, device_t, void *); 364 365 struct dkdriver fddkdriver = { fdstrategy }; 366 367 CFATTACH_DECL_NEW(fd, sizeof(struct fd_softc), 368 fdmatch, fdattach, NULL, NULL); 369 370 static int 371 fdmatch(device_t parent, cfdata_t match, void *aux) 372 { 373 374 return 1; 375 } 376 377 static void 378 fdattach(device_t parent, device_t self, void *aux) 379 { 380 struct fd_softc *sc; 381 struct fd_types *type; 382 u_short swtch; 383 384 sc = device_private(self); 385 sc->sc_dev = self; 386 387 callout_init(&sc->sc_motor_ch, 0); 388 389 /* 390 * Find out if an Ajax chip might be installed. Set the default 391 * floppy type accordingly. 392 */ 393 swtch = rd_cfg_switch(); 394 def_type = (swtch & CFG_SWITCH_NOHD) ? FLP_TYPE_720 : FLP_TYPE_144; 395 type = &fdtypes[def_type]; 396 397 aprint_normal(": %s %d cyl, %d head, %d sec\n", type->descr, 398 type->nblocks / (type->nsectors * type->nheads), type->nheads, 399 type->nsectors); 400 401 /* 402 * Initialize and attach the disk structure. 403 */ 404 disk_init(&sc->dkdev, device_xname(sc->sc_dev), &fddkdriver); 405 disk_attach(&sc->dkdev); 406 } 407 408 int 409 fdioctl(dev_t dev, u_long cmd, void * addr, int flag, struct lwp *l) 410 { 411 struct fd_softc *sc; 412 413 sc = device_lookup_private(&fd_cd, DISKUNIT(dev)); 414 415 if ((sc->flags & FLPF_HAVELAB) == 0) 416 return EBADF; 417 418 switch (cmd) { 419 case DIOCSBAD: 420 return EINVAL; 421 case DIOCGDINFO: 422 *(struct disklabel *)addr = *(sc->dkdev.dk_label); 423 return 0; 424 case DIOCGPART: 425 ((struct partinfo *)addr)->disklab = sc->dkdev.dk_label; 426 ((struct partinfo *)addr)->part = 427 &sc->dkdev.dk_label->d_partitions[RAW_PART]; 428 return 0; 429 #ifdef notyet /* XXX LWP */ 430 case DIOCSRETRIES: 431 case DIOCSSTEP: 432 case DIOCSDINFO: 433 case DIOCWDINFO: 434 case DIOCWLABEL: 435 break; 436 #endif /* notyet */ 437 case DIOCGDEFLABEL: 438 fdgetdefaultlabel(sc, (struct disklabel *)addr, RAW_PART); 439 return 0; 440 } 441 return ENOTTY; 442 } 443 444 /* 445 * Open the device. If this is the first open on both the floppy devices, 446 * intialize the controller. 447 * Note that partition info on the floppy device is used to distinguise 448 * between 780Kb and 360Kb floppy's. 449 * partition 0: 360Kb 450 * partition 1: 780Kb 451 */ 452 int 453 fdopen(dev_t dev, int flags, int devtype, struct lwp *l) 454 { 455 struct fd_softc *sc; 456 int s; 457 458 #ifdef FLP_DEBUG 459 printf("fdopen dev=0x%x\n", dev); 460 #endif 461 462 if (FLP_TYPE(dev) >= NR_TYPES) 463 return ENXIO; 464 465 if ((sc = device_lookup_private(&fd_cd, DISKUNIT(dev))) == NULL) 466 return ENXIO; 467 468 /* 469 * If no floppy currently open, reset the controller and select 470 * floppy type. 471 */ 472 if (nopens == 0) { 473 474 #ifdef FLP_DEBUG 475 printf("fdopen device not yet open\n"); 476 #endif 477 nopens++; 478 write_fdreg(FDC_CS, IRUPT); 479 delay(40); 480 } 481 482 /* 483 * Sleep while other process is opening the device 484 */ 485 s = splbio(); 486 while (sc->flags & FLPF_INOPEN) 487 tsleep((void *)sc, PRIBIO, "fdopen", 0); 488 splx(s); 489 490 if ((sc->flags & FLPF_ISOPEN) == 0) { 491 /* 492 * Initialise some driver values. 493 */ 494 int type; 495 void *addr; 496 497 type = FLP_TYPE(dev); 498 499 bufq_alloc(&sc->bufq, "disksort", BUFQ_SORT_RAWBLOCK); 500 sc->unit = DISKUNIT(dev); 501 sc->part = RAW_PART; 502 sc->nheads = fdtypes[type].nheads; 503 sc->nsectors = fdtypes[type].nsectors; 504 sc->nblocks = fdtypes[type].nblocks; 505 sc->density = fdtypes[type].density; 506 sc->curtrk = INV_TRK; 507 sc->sector = 0; 508 sc->errcnt = 0; 509 sc->bounceb = alloc_stmem(SECTOR_SIZE, &addr); 510 if (sc->bounceb == NULL) 511 return ENOMEM; /* XXX */ 512 513 /* 514 * Go get write protect + loaded status 515 */ 516 sc->flags |= FLPF_INOPEN|FLPF_GETSTAT; 517 s = splbio(); 518 st_dmagrab((dma_farg)fdcint, (dma_farg)fdstatus, sc, 519 &lock_stat, 0); 520 while ((sc->flags & FLPF_GETSTAT) != 0) 521 tsleep((void *)sc, PRIBIO, "fdopen", 0); 522 splx(s); 523 wakeup((void *)sc); 524 525 if ((sc->flags & FLPF_WRTPROT) != 0 && 526 (flags & FWRITE) != 0) { 527 sc->flags = 0; 528 return EPERM; 529 } 530 if ((sc->flags & FLPF_EMPTY) != 0) { 531 sc->flags = 0; 532 return ENXIO; 533 } 534 sc->flags &= ~(FLPF_INOPEN|FLPF_GETSTAT); 535 sc->flags |= FLPF_ISOPEN; 536 } else { 537 /* 538 * Multiply opens are granted when accessing the same type of 539 * floppy (eq. the same partition). 540 */ 541 if (sc->density != fdtypes[DISKPART(dev)].density) 542 return ENXIO; /* XXX temporarely out of business */ 543 } 544 fdgetdisklabel(sc, dev); 545 #ifdef FLP_DEBUG 546 printf("fdopen open succeeded on type %d\n", sc->part); 547 #endif 548 return 0; 549 } 550 551 int 552 fdclose(dev_t dev, int flags, int devtype, struct lwp *l) 553 { 554 struct fd_softc *sc; 555 556 sc = device_lookup_private(&fd_cd, DISKUNIT(dev)); 557 free_stmem(sc->bounceb); 558 sc->flags = 0; 559 nopens--; 560 561 #ifdef FLP_DEBUG 562 printf("Closed floppy device -- nopens: %d\n", nopens); 563 #endif 564 return 0; 565 } 566 567 void 568 fdstrategy(struct buf *bp) 569 { 570 struct fd_softc *sc; 571 struct disklabel *lp; 572 int s, sz; 573 574 sc = device_lookup_private(&fd_cd, DISKUNIT(bp->b_dev)); 575 576 #ifdef FLP_DEBUG 577 printf("fdstrategy: %p, b_bcount: %ld\n", bp, bp->b_bcount); 578 #endif 579 580 /* 581 * check for valid partition and bounds 582 */ 583 lp = sc->dkdev.dk_label; 584 if ((sc->flags & FLPF_HAVELAB) == 0) { 585 bp->b_error = EIO; 586 goto done; 587 } 588 if (bp->b_blkno < 0 || (bp->b_bcount % SECTOR_SIZE) != 0) { 589 bp->b_error = EINVAL; 590 goto done; 591 } 592 if (bp->b_bcount == 0) 593 goto done; 594 595 sz = howmany(bp->b_bcount, SECTOR_SIZE); 596 597 if (bp->b_blkno + sz > sc->nblocks) { 598 sz = sc->nblocks - bp->b_blkno; 599 if (sz == 0) /* Exactly at EndOfDisk */ 600 goto done; 601 if (sz < 0) { /* Past EndOfDisk */ 602 bp->b_error = EINVAL; 603 goto done; 604 } 605 /* Trucate it */ 606 if (bp->b_flags & B_RAW) 607 bp->b_bcount = sz << DEV_BSHIFT; 608 else 609 bp->b_bcount = sz * lp->d_secsize; 610 } 611 612 /* No partition translation. */ 613 bp->b_rawblkno = bp->b_blkno; 614 615 /* 616 * queue the buf and kick the low level code 617 */ 618 s = splbio(); 619 bufq_put(sc->bufq, bp); /* XXX disksort_cylinder */ 620 if (!lock_stat) { 621 if (fd_state & FLP_MON) 622 callout_stop(&sc->sc_motor_ch); 623 fd_state = FLP_IDLE; 624 st_dmagrab((dma_farg)fdcint, (dma_farg)fdstart, sc, 625 &lock_stat, 0); 626 } 627 splx(s); 628 629 return; 630 done: 631 bp->b_resid = bp->b_bcount; 632 biodone(bp); 633 } 634 635 int 636 fdread(dev_t dev, struct uio *uio, int flags) 637 { 638 639 return physio(fdstrategy, NULL, dev, B_READ, fdminphys, uio); 640 } 641 642 int 643 fdwrite(dev_t dev, struct uio *uio, int flags) 644 { 645 646 return physio(fdstrategy, NULL, dev, B_WRITE, fdminphys, uio); 647 } 648 649 /* 650 * Called through DMA-dispatcher, get status. 651 */ 652 static void 653 fdstatus(struct fd_softc *sc) 654 { 655 656 #ifdef FLP_DEBUG 657 printf("fdstatus\n"); 658 #endif 659 sc->errcnt = 0; 660 fd_state = FLP_STAT; 661 fd_xfer(sc); 662 } 663 664 /* 665 * Called through the DMA-dispatcher. So we know we are the only ones 666 * messing with the floppy-controller. 667 * Initialize some fields in the fdsoftc for the state-machine and get 668 * it going. 669 */ 670 static void 671 fdstart(struct fd_softc *sc) 672 { 673 struct buf *bp; 674 675 bp = bufq_peek(sc->bufq); 676 sc->sector = bp->b_blkno; /* Start sector for I/O */ 677 sc->io_data = bp->b_data; /* KVA base for I/O */ 678 sc->io_bytes = bp->b_bcount; /* Transfer size in bytes */ 679 sc->io_dir = bp->b_flags & B_READ;/* Direction of transfer */ 680 sc->errcnt = 0; /* No errors yet */ 681 fd_state = FLP_XFER; /* Yes, we're going to transfer */ 682 683 /* Instrumentation. */ 684 disk_busy(&sc->dkdev); 685 686 fd_xfer(sc); 687 } 688 689 /* 690 * The current transaction is finished (for good or bad). Let go of 691 * the DMA-resources. Call biodone() to finish the transaction. 692 * Find a new transaction to work on. 693 */ 694 static void 695 fddone(register struct fd_softc *sc) 696 { 697 struct buf *bp; 698 struct fd_softc *sc1; 699 int i, s; 700 701 /* 702 * Give others a chance to use the DMA. 703 */ 704 st_dmafree(sc, &lock_stat); 705 706 707 if (fd_state != FLP_STAT) { 708 /* 709 * Finish current transaction. 710 */ 711 s = splbio(); 712 bp = bufq_get(sc->bufq); 713 if (bp == NULL) 714 panic("fddone"); 715 splx(s); 716 717 #ifdef FLP_DEBUG 718 printf("fddone: unit: %d, buf: %p, resid: %d\n",sc->unit, bp, 719 sc->io_bytes); 720 #endif 721 bp->b_resid = sc->io_bytes; 722 723 disk_unbusy(&sc->dkdev, (bp->b_bcount - bp->b_resid), 724 (bp->b_flags & B_READ)); 725 726 biodone(bp); 727 } 728 fd_state = FLP_MON; 729 730 if (lock_stat) 731 return; /* XXX Is this possible? */ 732 733 /* 734 * Find a new transaction on round-robin basis. 735 */ 736 for (i = sc->unit + 1;; i++) { 737 if (i >= fd_cd.cd_ndevs) 738 i = 0; 739 if ((sc1 = device_lookup_private(&fd_cd, i)) == NULL) 740 continue; 741 if (bufq_peek(sc1->bufq) != NULL) 742 break; 743 if (i == sc->unit) { 744 callout_reset(&sc->sc_motor_ch, FLP_MONDELAY, 745 (FPV)fdmotoroff, sc); 746 #ifdef FLP_DEBUG 747 printf("fddone: Nothing to do\n"); 748 #endif 749 return; /* No work */ 750 } 751 } 752 fd_state = FLP_IDLE; 753 #ifdef FLP_DEBUG 754 printf("fddone: Staring job on unit %d\n", sc1->unit); 755 #endif 756 st_dmagrab((dma_farg)fdcint, (dma_farg)fdstart, sc1, &lock_stat, 0); 757 } 758 759 static int 760 fdselect(int drive, int head, int dense) 761 { 762 int i, spinning; 763 764 #ifdef FLP_DEBUG 765 printf("fdselect: drive=%d, head=%d, dense=%d\n", drive, head, dense); 766 #endif 767 i = ((drive == 1) ? PA_FLOP1 : PA_FLOP0) | head; 768 spinning = motoron; 769 motoron = 1; 770 771 switch (dense) { 772 case FLP_DD: 773 DMA->dma_drvmode = 0; 774 break; 775 case FLP_HD: 776 DMA->dma_drvmode = (FDC_HDSET|FDC_HDSIG); 777 break; 778 default: 779 panic("fdselect: unknown density code"); 780 } 781 if (i != selected) { 782 selected = i; 783 ym2149_fd_select((i ^ PA_FDSEL)); 784 } 785 return spinning; 786 } 787 788 static void 789 fddeselect(void) 790 { 791 792 ym2149_fd_select(PA_FDSEL); 793 motoron = selected = 0; 794 DMA->dma_drvmode = 0; 795 } 796 797 /**************************************************************************** 798 * The following functions assume to be running as a result of a * 799 * disk-interrupt (e.q. spl = splbio). * 800 * They form the finit-state machine, the actual driver. * 801 * * 802 * fdstart()/ --> fd_xfer() -> activate hardware * 803 * fdopen() ^ * 804 * | * 805 * +-- not ready -<------------+ * 806 * | * 807 * fdmotoroff()/ --> fdcint() -> fd_xfer_ok() ---+ * 808 * h/w interrupt | * 809 * \|/ * 810 * finished ---> fdone() * 811 * * 812 ****************************************************************************/ 813 static void 814 fd_xfer(struct fd_softc *sc) 815 { 816 int head; 817 int track, sector, hbit; 818 paddr_t phys_addr; 819 820 head = track = 0; 821 switch (fd_state) { 822 case FLP_XFER: 823 /* 824 * Calculate head/track values 825 */ 826 track = sc->sector / sc->nsectors; 827 head = track % sc->nheads; 828 track = track / sc->nheads; 829 #ifdef FLP_DEBUG 830 printf("fd_xfer: sector:%d,head:%d,track:%d\n", 831 sc->sector, head, track); 832 #endif 833 break; 834 835 case FLP_STAT: 836 /* 837 * FLP_STAT only wants to recalibrate 838 */ 839 sc->curtrk = INV_TRK; 840 break; 841 default: 842 panic("fd_xfer: wrong state (0x%x)", fd_state); 843 } 844 845 /* 846 * Select the drive. 847 */ 848 hbit = fdselect(sc->unit, head, sc->density) ? HBIT : 0; 849 850 if (sc->curtrk == INV_TRK) { 851 /* 852 * Recalibrate, since we lost track of head positioning. 853 * The floppy disk controller has no way of determining its 854 * absolute arm position (track). Instead, it steps the 855 * arm a track at a time and keeps track of where it 856 * thinks it is (in software). However, after a SEEK, the 857 * hardware reads information from the diskette telling 858 * where the arm actually is. If the arm is in the wrong place, 859 * a recalibration is done, which forces the arm to track 0. 860 * This way the controller can get back into sync with reality. 861 */ 862 fd_cmd = RESTORE; 863 write_fdreg(FDC_CS, RESTORE|VBIT|hbit); 864 callout_reset(&sc->sc_motor_ch, FLP_XFERDELAY, 865 (FPV)fdmotoroff, sc); 866 867 #ifdef FLP_DEBUG 868 printf("fd_xfer:Recalibrating drive %d\n", sc->unit); 869 #endif 870 return; 871 } 872 873 write_fdreg(FDC_TR, sc->curtrk); 874 875 /* 876 * Issue a SEEK command on the indicated drive unless the arm is 877 * already positioned on the correct track. 878 */ 879 if (track != sc->curtrk) { 880 sc->curtrk = track; /* be optimistic */ 881 write_fdreg(FDC_DR, track); 882 write_fdreg(FDC_CS, SEEK|RATE6|VBIT|hbit); 883 callout_reset(&sc->sc_motor_ch, FLP_XFERDELAY, 884 (FPV)fdmotoroff, sc); 885 fd_cmd = SEEK; 886 #ifdef FLP_DEBUG 887 printf("fd_xfer:Seek to track %d on drive %d\n", 888 track, sc->unit); 889 #endif 890 return; 891 } 892 893 /* 894 * The drive is now on the proper track. Read or write 1 block. 895 */ 896 sector = sc->sector % sc->nsectors; 897 sector++; /* start numbering at 1 */ 898 899 write_fdreg(FDC_SR, sector); 900 901 phys_addr = (paddr_t)kvtop(sc->io_data); 902 if (phys_addr >= FDC_MAX_DMA_AD) { 903 /* 904 * We _must_ bounce this address 905 */ 906 phys_addr = (paddr_t)kvtop(sc->bounceb); 907 if (sc->io_dir == B_WRITE) 908 memcpy(sc->bounceb, sc->io_data, SECTOR_SIZE); 909 sc->flags |= FLPF_BOUNCE; 910 } 911 st_dmaaddr_set((void *)phys_addr); /* DMA address setup */ 912 913 #ifdef FLP_DEBUG 914 printf("fd_xfer:Start io (io_addr:%lx)\n", (u_long)kvtop(sc->io_data)); 915 #endif 916 917 if (sc->io_dir == B_READ) { 918 /* Issue the command */ 919 st_dmacomm(DMA_FDC | DMA_SCREG, 1); 920 write_fdreg(FDC_CS, F_READ|hbit); 921 fd_cmd = F_READ; 922 } else { 923 /* Issue the command */ 924 st_dmacomm(DMA_WRBIT | DMA_FDC | DMA_SCREG, 1); 925 write_fdreg(DMA_WRBIT | FDC_CS, F_WRITE|hbit|EBIT|PBIT); 926 fd_cmd = F_WRITE; 927 } 928 callout_reset(&sc->sc_motor_ch, FLP_XFERDELAY, (FPV)fdmotoroff, sc); 929 } 930 931 /* return values of fd_xfer_ok(): */ 932 #define X_OK 0 933 #define X_AGAIN 1 934 #define X_ERROR 2 935 #define X_FAIL 3 936 937 /* 938 * Hardware interrupt function. 939 */ 940 static void 941 fdcint(struct fd_softc *sc) 942 { 943 struct buf *bp; 944 945 #ifdef FLP_DEBUG 946 printf("fdcint: unit = %d\n", sc->unit); 947 #endif 948 949 /* 950 * Cancel timeout (we made it, didn't we) 951 */ 952 callout_stop(&sc->sc_motor_ch); 953 954 switch (fd_xfer_ok(sc)) { 955 case X_ERROR: 956 if (++sc->errcnt < MAX_ERRORS) { 957 /* 958 * Command failed but still retries left. 959 */ 960 break; 961 } 962 /* FALL THROUGH */ 963 case X_FAIL: 964 /* 965 * Non recoverable error. Fall back to motor-on 966 * idle-state. 967 */ 968 if (fd_error != NULL) { 969 printf("Floppy error: %s\n", fd_error); 970 fd_error = NULL; 971 } 972 973 if (fd_state == FLP_STAT) { 974 sc->flags |= FLPF_EMPTY; 975 sc->flags &= ~FLPF_GETSTAT; 976 wakeup((void *)sc); 977 fddone(sc); 978 return; 979 } 980 981 bp = bufq_peek(sc->bufq); 982 983 bp->b_error = EIO; 984 fd_state = FLP_MON; 985 986 break; 987 case X_AGAIN: 988 /* 989 * Start next part of state machine. 990 */ 991 break; 992 case X_OK: 993 /* 994 * Command ok and finished. Reset error-counter. 995 * If there are no more bytes to transfer fall back 996 * to motor-on idle state. 997 */ 998 sc->errcnt = 0; 999 1000 if (fd_state == FLP_STAT) { 1001 sc->flags &= ~FLPF_GETSTAT; 1002 wakeup((void *)sc); 1003 fddone(sc); 1004 return; 1005 } 1006 1007 if ((sc->flags & FLPF_BOUNCE) != 0 && 1008 sc->io_dir == B_READ) 1009 memcpy(sc->io_data, sc->bounceb, SECTOR_SIZE); 1010 sc->flags &= ~FLPF_BOUNCE; 1011 1012 sc->sector++; 1013 sc->io_data += SECTOR_SIZE; 1014 sc->io_bytes -= SECTOR_SIZE; 1015 if (sc->io_bytes <= 0) 1016 fd_state = FLP_MON; 1017 } 1018 if (fd_state == FLP_MON) 1019 fddone(sc); 1020 else 1021 fd_xfer(sc); 1022 } 1023 1024 /* 1025 * Determine status of last command. Should only be called through 1026 * 'fdcint()'. 1027 * Returns: 1028 * X_ERROR : Error on command; might succeed next time. 1029 * X_FAIL : Error on command; will never succeed. 1030 * X_AGAIN : Part of a command succeeded, call 'fd_xfer()' to complete. 1031 * X_OK : Command succeeded and is complete. 1032 * 1033 * This function only affects sc->curtrk. 1034 */ 1035 static int 1036 fd_xfer_ok(register struct fd_softc *sc) 1037 { 1038 int status; 1039 1040 #ifdef FLP_DEBUG 1041 printf("fd_xfer_ok: cmd: 0x%x, state: 0x%x\n", fd_cmd, fd_state); 1042 #endif 1043 switch (fd_cmd) { 1044 case IRUPT: 1045 /* 1046 * Timeout. Force a recalibrate before we try again. 1047 */ 1048 status = read_fdreg(FDC_CS); 1049 1050 fd_error = "Timeout"; 1051 sc->curtrk = INV_TRK; 1052 return X_ERROR; 1053 case F_READ: 1054 /* 1055 * Test for DMA error 1056 */ 1057 status = read_dmastat(); 1058 if ((status & DMAOK) == 0) { 1059 fd_error = "DMA error"; 1060 return X_ERROR; 1061 } 1062 /* 1063 * Get controller status and check for errors. 1064 */ 1065 status = read_fdreg(FDC_CS); 1066 if ((status & (RNF | CRCERR | LD_T00)) != 0) { 1067 fd_error = "Read error"; 1068 if ((status & RNF) != 0) 1069 sc->curtrk = INV_TRK; 1070 return X_ERROR; 1071 } 1072 break; 1073 case F_WRITE: 1074 /* 1075 * Test for DMA error 1076 */ 1077 status = read_dmastat(); 1078 if ((status & DMAOK) == 0) { 1079 fd_error = "DMA error"; 1080 return X_ERROR; 1081 } 1082 /* 1083 * Get controller status and check for errors. 1084 */ 1085 status = read_fdreg(FDC_CS); 1086 if ((status & WRI_PRO) != 0) { 1087 fd_error = "Write protected"; 1088 return X_FAIL; 1089 } 1090 if ((status & (RNF | CRCERR | LD_T00)) != 0) { 1091 fd_error = "Write error"; 1092 sc->curtrk = INV_TRK; 1093 return X_ERROR; 1094 } 1095 break; 1096 case SEEK: 1097 status = read_fdreg(FDC_CS); 1098 if ((status & (RNF | CRCERR)) != 0) { 1099 fd_error = "Seek error"; 1100 sc->curtrk = INV_TRK; 1101 return X_ERROR; 1102 } 1103 return X_AGAIN; 1104 case RESTORE: 1105 /* 1106 * Determine if the recalibration succeeded. 1107 */ 1108 status = read_fdreg(FDC_CS); 1109 if ((status & RNF) != 0) { 1110 fd_error = "Recalibrate error"; 1111 /* reset controller */ 1112 write_fdreg(FDC_CS, IRUPT); 1113 sc->curtrk = INV_TRK; 1114 return X_ERROR; 1115 } 1116 sc->curtrk = 0; 1117 if (fd_state == FLP_STAT) { 1118 if ((status & WRI_PRO) != 0) 1119 sc->flags |= FLPF_WRTPROT; 1120 break; 1121 } 1122 return X_AGAIN; 1123 default: 1124 fd_error = "Driver error: fd_xfer_ok : Unknown state"; 1125 return X_FAIL; 1126 } 1127 return X_OK; 1128 } 1129 1130 /* 1131 * All timeouts will call this function. 1132 */ 1133 static void 1134 fdmotoroff(struct fd_softc *sc) 1135 { 1136 int s; 1137 1138 /* 1139 * Get at harware interrupt level 1140 */ 1141 s = splbio(); 1142 1143 #if FLP_DEBUG 1144 printf("fdmotoroff, state = 0x%x\n", fd_state); 1145 #endif 1146 1147 switch (fd_state) { 1148 case FLP_STAT: 1149 case FLP_XFER: 1150 /* 1151 * Timeout during a transfer; cancel transaction 1152 * set command to 'IRUPT'. 1153 * A drive-interrupt is simulated to trigger the state 1154 * machine. 1155 */ 1156 /* 1157 * Cancel current transaction 1158 */ 1159 fd_cmd = IRUPT; 1160 write_fdreg(FDC_CS, IRUPT); 1161 delay(20); 1162 (void)read_fdreg(FDC_CS); 1163 write_fdreg(FDC_CS, RESTORE); 1164 break; 1165 1166 case FLP_MON: 1167 /* 1168 * Turn motor off. 1169 */ 1170 if (selected) { 1171 int tmp; 1172 1173 st_dmagrab((dma_farg)fdcint, (dma_farg)fdmoff, sc, 1174 &tmp, 0); 1175 } else 1176 fd_state = FLP_IDLE; 1177 break; 1178 } 1179 splx(s); 1180 } 1181 1182 /* 1183 * min byte count to whats left of the track in question 1184 */ 1185 static void 1186 fdminphys(struct buf *bp) 1187 { 1188 struct fd_softc *sc; 1189 int sec, toff, tsz; 1190 1191 if ((sc = device_lookup_private(&fd_cd, DISKUNIT(bp->b_dev))) == NULL) 1192 panic("fdminphys: couldn't get softc"); 1193 1194 sec = bp->b_blkno % (sc->nsectors * sc->nheads); 1195 toff = sec * SECTOR_SIZE; 1196 tsz = sc->nsectors * sc->nheads * SECTOR_SIZE; 1197 1198 #ifdef FLP_DEBUG 1199 printf("fdminphys: before %ld", bp->b_bcount); 1200 #endif 1201 1202 bp->b_bcount = min(bp->b_bcount, tsz - toff); 1203 1204 #ifdef FLP_DEBUG 1205 printf(" after %ld\n", bp->b_bcount); 1206 #endif 1207 1208 minphys(bp); 1209 } 1210 1211 /* 1212 * Called from fdmotoroff to turn the motor actually off.... 1213 * This can't be done in fdmotoroff itself, because exclusive access to the 1214 * DMA controller is needed to read the FDC-status register. The function 1215 * 'fdmoff()' always runs as the result of a 'dmagrab()'. 1216 * We need to test the status-register because we want to be sure that the 1217 * drive motor is really off before deselecting the drive. The FDC only 1218 * turns off the drive motor after having seen 10 index-pulses. You only 1219 * get index-pulses when a drive is selected....This means that if the 1220 * drive is deselected when the motor is still spinning, it will continue 1221 * to spin _even_ when you insert a floppy later on... 1222 */ 1223 static void 1224 fdmoff(struct fd_softc *fdsoftc) 1225 { 1226 int tmp; 1227 1228 if ((fd_state == FLP_MON) && selected) { 1229 tmp = read_fdreg(FDC_CS); 1230 if ((tmp & MOTORON) == 0) { 1231 fddeselect(); 1232 fd_state = FLP_IDLE; 1233 } else 1234 callout_reset(&fdsoftc->sc_motor_ch, 10 * FLP_MONDELAY, 1235 (FPV)fdmotoroff, fdsoftc); 1236 } 1237 st_dmafree(fdsoftc, &tmp); 1238 } 1239 1240 /* 1241 * Used to find out wich drives are actually connected. We do this by issuing 1242 * is 'RESTORE' command and check if the 'track-0' bit is set. This also works 1243 * if the drive is present but no floppy is inserted. 1244 */ 1245 static void 1246 fdtestdrv(struct fd_softc *fdsoftc) 1247 { 1248 int status; 1249 1250 /* 1251 * Select the right unit and head. 1252 */ 1253 fdselect(fdsoftc->unit, 0, FLP_DD); 1254 1255 write_fdreg(FDC_CS, RESTORE|HBIT); 1256 1257 /* 1258 * Wait for about 2 seconds. 1259 */ 1260 delay(2000000); 1261 1262 status = read_fdreg(FDC_CS); 1263 if ((status & (RNF|BUSY)) != 0) { 1264 write_fdreg(FDC_CS, IRUPT); /* reset controller */ 1265 delay(40); 1266 } 1267 1268 if ((status & LD_T00) == 0) 1269 fdsoftc->flags |= FLPF_NOTRESP; 1270 1271 fddeselect(); 1272 } 1273 1274 static void 1275 fdgetdefaultlabel(struct fd_softc *sc, struct disklabel *lp, int part) 1276 { 1277 1278 memset(lp, 0, sizeof(struct disklabel)); 1279 1280 lp->d_secsize = SECTOR_SIZE; 1281 lp->d_ntracks = sc->nheads; 1282 lp->d_nsectors = sc->nsectors; 1283 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 1284 lp->d_ncylinders = sc->nblocks / lp->d_secpercyl; 1285 lp->d_secperunit = sc->nblocks; 1286 1287 lp->d_type = DTYPE_FLOPPY; 1288 lp->d_rpm = 300; /* good guess I suppose. */ 1289 lp->d_interleave = 1; /* FIXME: is this OK? */ 1290 lp->d_bbsize = 0; 1291 lp->d_sbsize = 0; 1292 lp->d_npartitions = part + 1; 1293 lp->d_trkseek = STEP_DELAY; 1294 lp->d_magic = DISKMAGIC; 1295 lp->d_magic2 = DISKMAGIC; 1296 lp->d_checksum = dkcksum(lp); 1297 lp->d_partitions[part].p_size = lp->d_secperunit; 1298 lp->d_partitions[part].p_fstype = FS_UNUSED; 1299 lp->d_partitions[part].p_fsize = 1024; 1300 lp->d_partitions[part].p_frag = 8; 1301 } 1302 1303 /* 1304 * Build disk label. For now we only create a label from what we know 1305 * from 'sc'. 1306 */ 1307 static int 1308 fdgetdisklabel(struct fd_softc *sc, dev_t dev) 1309 { 1310 struct disklabel *lp; 1311 int part; 1312 1313 /* 1314 * If we already got one, get out. 1315 */ 1316 if ((sc->flags & FLPF_HAVELAB) != 0) 1317 return 0; 1318 1319 #ifdef FLP_DEBUG 1320 printf("fdgetdisklabel()\n"); 1321 #endif 1322 1323 part = RAW_PART; 1324 lp = sc->dkdev.dk_label; 1325 fdgetdefaultlabel(sc, lp, part); 1326 sc->flags |= FLPF_HAVELAB; 1327 1328 return 0; 1329 } 1330