1 /* $NetBSD: fd.c,v 1.77 2014/03/16 05:20:23 dholland 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 1.77 2014/03/16 05:20:23 dholland 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 .d_open = fdopen, 284 .d_close = fdclose, 285 .d_strategy = fdstrategy, 286 .d_ioctl = fdioctl, 287 .d_dump = nodump, 288 .d_psize = nosize, 289 .d_flag = D_DISK 290 }; 291 292 const struct cdevsw fd_cdevsw = { 293 .d_open = fdopen, 294 .d_close = fdclose, 295 .d_read = fdread, 296 .d_write = fdwrite, 297 .d_ioctl = fdioctl, 298 .d_stop = nostop, 299 .d_tty = notty, 300 .d_poll = nopoll, 301 .d_mmap = nommap, 302 .d_kqfilter = nokqfilter, 303 .d_flag = D_DISK 304 }; 305 306 static int 307 fdcmatch(device_t parent, cfdata_t match, void *aux) 308 { 309 static int fdc_matched = 0; 310 311 /* Match only once */ 312 if (strcmp("fdc", aux) || fdc_matched) 313 return 0; 314 fdc_matched = 1; 315 return 1; 316 } 317 318 static void 319 fdcattach(device_t parent, device_t self, void *aux) 320 { 321 struct fd_softc fdsoftc; 322 int i, nfound, first_found; 323 324 nfound = first_found = 0; 325 printf("\n"); 326 fddeselect(); 327 for (i = 0; i < NR_DRIVES; i++) { 328 329 /* 330 * Test if unit is present 331 */ 332 fdsoftc.unit = i; 333 fdsoftc.flags = 0; 334 st_dmagrab((dma_farg)fdcint, (dma_farg)fdtestdrv, &fdsoftc, 335 &lock_stat, 0); 336 st_dmafree(&fdsoftc, &lock_stat); 337 338 if ((fdsoftc.flags & FLPF_NOTRESP) == 0) { 339 if (nfound == 0) 340 first_found = i; 341 nfound++; 342 config_found(self, (void *)i, fdcprint); 343 } 344 } 345 346 if (nfound != 0) { 347 struct fd_softc *fdsc = 348 device_lookup_private(&fd_cd, first_found); 349 350 /* 351 * Make sure motor will be turned of when a floppy is 352 * inserted in the first selected drive. 353 */ 354 fdselect(first_found, 0, FLP_DD); 355 fd_state = FLP_MON; 356 callout_reset(&fdsc->sc_motor_ch, 0, (FPV)fdmotoroff, fdsc); 357 358 /* 359 * enable disk related interrupts 360 */ 361 MFP->mf_ierb |= IB_DINT; 362 MFP->mf_iprb = (uint8_t)~IB_DINT; 363 MFP->mf_imrb |= IB_DINT; 364 } 365 } 366 367 static int 368 fdcprint(void *aux, const char *pnp) 369 { 370 371 if (pnp != NULL) 372 aprint_normal("fd%d at %s:", (int)aux, pnp); 373 374 return UNCONF; 375 } 376 377 static int fdmatch(device_t, cfdata_t, void *); 378 static void fdattach(device_t, device_t, void *); 379 380 struct dkdriver fddkdriver = { fdstrategy }; 381 382 CFATTACH_DECL_NEW(fd, sizeof(struct fd_softc), 383 fdmatch, fdattach, NULL, NULL); 384 385 static int 386 fdmatch(device_t parent, cfdata_t match, void *aux) 387 { 388 389 return 1; 390 } 391 392 static void 393 fdattach(device_t parent, device_t self, void *aux) 394 { 395 struct fd_softc *sc; 396 struct fd_types *type; 397 u_short swtch; 398 399 sc = device_private(self); 400 sc->sc_dev = self; 401 402 callout_init(&sc->sc_motor_ch, 0); 403 404 /* 405 * Find out if an Ajax chip might be installed. Set the default 406 * floppy type accordingly. 407 */ 408 swtch = rd_cfg_switch(); 409 def_type = (swtch & CFG_SWITCH_NOHD) ? FLP_TYPE_720 : FLP_TYPE_144; 410 type = &fdtypes[def_type]; 411 412 aprint_normal(": %s %d cyl, %d head, %d sec\n", type->descr, 413 type->nblocks / (type->nsectors * type->nheads), type->nheads, 414 type->nsectors); 415 416 /* 417 * Initialize and attach the disk structure. 418 */ 419 disk_init(&sc->dkdev, device_xname(sc->sc_dev), &fddkdriver); 420 disk_attach(&sc->dkdev); 421 } 422 423 int 424 fdioctl(dev_t dev, u_long cmd, void * addr, int flag, struct lwp *l) 425 { 426 struct fd_softc *sc; 427 428 sc = device_lookup_private(&fd_cd, DISKUNIT(dev)); 429 430 if ((sc->flags & FLPF_HAVELAB) == 0) 431 return EBADF; 432 433 switch (cmd) { 434 case DIOCSBAD: 435 return EINVAL; 436 case DIOCGDINFO: 437 *(struct disklabel *)addr = *(sc->dkdev.dk_label); 438 return 0; 439 case DIOCGPART: 440 ((struct partinfo *)addr)->disklab = sc->dkdev.dk_label; 441 ((struct partinfo *)addr)->part = 442 &sc->dkdev.dk_label->d_partitions[RAW_PART]; 443 return 0; 444 #ifdef notyet /* XXX LWP */ 445 case DIOCSRETRIES: 446 case DIOCSSTEP: 447 case DIOCSDINFO: 448 case DIOCWDINFO: 449 case DIOCWLABEL: 450 break; 451 #endif /* notyet */ 452 case DIOCGDEFLABEL: 453 fdgetdefaultlabel(sc, (struct disklabel *)addr, RAW_PART); 454 return 0; 455 } 456 return ENOTTY; 457 } 458 459 /* 460 * Open the device. If this is the first open on both the floppy devices, 461 * intialize the controller. 462 * Note that partition info on the floppy device is used to distinguise 463 * between 780Kb and 360Kb floppy's. 464 * partition 0: 360Kb 465 * partition 1: 780Kb 466 */ 467 int 468 fdopen(dev_t dev, int flags, int devtype, struct lwp *l) 469 { 470 struct fd_softc *sc; 471 int s; 472 473 #ifdef FLP_DEBUG 474 printf("fdopen dev=0x%x\n", dev); 475 #endif 476 477 if (FLP_TYPE(dev) >= NR_TYPES) 478 return ENXIO; 479 480 if ((sc = device_lookup_private(&fd_cd, DISKUNIT(dev))) == NULL) 481 return ENXIO; 482 483 /* 484 * If no floppy currently open, reset the controller and select 485 * floppy type. 486 */ 487 if (nopens == 0) { 488 489 #ifdef FLP_DEBUG 490 printf("fdopen device not yet open\n"); 491 #endif 492 nopens++; 493 write_fdreg(FDC_CS, IRUPT); 494 delay(40); 495 } 496 497 /* 498 * Sleep while other process is opening the device 499 */ 500 s = splbio(); 501 while (sc->flags & FLPF_INOPEN) 502 tsleep((void *)sc, PRIBIO, "fdopen", 0); 503 splx(s); 504 505 if ((sc->flags & FLPF_ISOPEN) == 0) { 506 /* 507 * Initialise some driver values. 508 */ 509 int type; 510 void *addr; 511 512 type = FLP_TYPE(dev); 513 514 bufq_alloc(&sc->bufq, "disksort", BUFQ_SORT_RAWBLOCK); 515 sc->unit = DISKUNIT(dev); 516 sc->part = RAW_PART; 517 sc->nheads = fdtypes[type].nheads; 518 sc->nsectors = fdtypes[type].nsectors; 519 sc->nblocks = fdtypes[type].nblocks; 520 sc->density = fdtypes[type].density; 521 sc->curtrk = INV_TRK; 522 sc->sector = 0; 523 sc->errcnt = 0; 524 sc->bounceb = alloc_stmem(SECTOR_SIZE, &addr); 525 if (sc->bounceb == NULL) 526 return ENOMEM; /* XXX */ 527 528 /* 529 * Go get write protect + loaded status 530 */ 531 sc->flags |= FLPF_INOPEN|FLPF_GETSTAT; 532 s = splbio(); 533 st_dmagrab((dma_farg)fdcint, (dma_farg)fdstatus, sc, 534 &lock_stat, 0); 535 while ((sc->flags & FLPF_GETSTAT) != 0) 536 tsleep((void *)sc, PRIBIO, "fdopen", 0); 537 splx(s); 538 wakeup((void *)sc); 539 540 if ((sc->flags & FLPF_WRTPROT) != 0 && 541 (flags & FWRITE) != 0) { 542 sc->flags = 0; 543 return EPERM; 544 } 545 if ((sc->flags & FLPF_EMPTY) != 0) { 546 sc->flags = 0; 547 return ENXIO; 548 } 549 sc->flags &= ~(FLPF_INOPEN|FLPF_GETSTAT); 550 sc->flags |= FLPF_ISOPEN; 551 } else { 552 /* 553 * Multiply opens are granted when accessing the same type of 554 * floppy (eq. the same partition). 555 */ 556 if (sc->density != fdtypes[DISKPART(dev)].density) 557 return ENXIO; /* XXX temporarely out of business */ 558 } 559 fdgetdisklabel(sc, dev); 560 #ifdef FLP_DEBUG 561 printf("fdopen open succeeded on type %d\n", sc->part); 562 #endif 563 return 0; 564 } 565 566 int 567 fdclose(dev_t dev, int flags, int devtype, struct lwp *l) 568 { 569 struct fd_softc *sc; 570 571 sc = device_lookup_private(&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(struct buf *bp) 584 { 585 struct fd_softc *sc; 586 struct disklabel *lp; 587 int s, sz; 588 589 sc = device_lookup_private(&fd_cd, DISKUNIT(bp->b_dev)); 590 591 #ifdef FLP_DEBUG 592 printf("fdstrategy: %p, b_bcount: %ld\n", bp, bp->b_bcount); 593 #endif 594 595 /* 596 * check for valid partition and bounds 597 */ 598 lp = sc->dkdev.dk_label; 599 if ((sc->flags & FLPF_HAVELAB) == 0) { 600 bp->b_error = EIO; 601 goto done; 602 } 603 if (bp->b_blkno < 0 || (bp->b_bcount % SECTOR_SIZE) != 0) { 604 bp->b_error = EINVAL; 605 goto done; 606 } 607 if (bp->b_bcount == 0) 608 goto done; 609 610 sz = howmany(bp->b_bcount, SECTOR_SIZE); 611 612 if (bp->b_blkno + sz > sc->nblocks) { 613 sz = sc->nblocks - bp->b_blkno; 614 if (sz == 0) /* Exactly at EndOfDisk */ 615 goto done; 616 if (sz < 0) { /* Past EndOfDisk */ 617 bp->b_error = EINVAL; 618 goto done; 619 } 620 /* Trucate it */ 621 if (bp->b_flags & B_RAW) 622 bp->b_bcount = sz << DEV_BSHIFT; 623 else 624 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 s = 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(s); 643 644 return; 645 done: 646 bp->b_resid = bp->b_bcount; 647 biodone(bp); 648 } 649 650 int 651 fdread(dev_t dev, struct uio *uio, int flags) 652 { 653 654 return physio(fdstrategy, NULL, dev, B_READ, fdminphys, uio); 655 } 656 657 int 658 fdwrite(dev_t dev, struct uio *uio, int flags) 659 { 660 661 return physio(fdstrategy, NULL, dev, B_WRITE, fdminphys, uio); 662 } 663 664 /* 665 * Called through DMA-dispatcher, get status. 666 */ 667 static void 668 fdstatus(struct fd_softc *sc) 669 { 670 671 #ifdef FLP_DEBUG 672 printf("fdstatus\n"); 673 #endif 674 sc->errcnt = 0; 675 fd_state = FLP_STAT; 676 fd_xfer(sc); 677 } 678 679 /* 680 * Called through the DMA-dispatcher. So we know we are the only ones 681 * messing with the floppy-controller. 682 * Initialize some fields in the fdsoftc for the state-machine and get 683 * it going. 684 */ 685 static void 686 fdstart(struct fd_softc *sc) 687 { 688 struct buf *bp; 689 690 bp = bufq_peek(sc->bufq); 691 sc->sector = bp->b_blkno; /* Start sector for I/O */ 692 sc->io_data = bp->b_data; /* KVA base for I/O */ 693 sc->io_bytes = bp->b_bcount; /* Transfer size in bytes */ 694 sc->io_dir = bp->b_flags & B_READ;/* Direction of transfer */ 695 sc->errcnt = 0; /* No errors yet */ 696 fd_state = FLP_XFER; /* Yes, we're going to transfer */ 697 698 /* Instrumentation. */ 699 disk_busy(&sc->dkdev); 700 701 fd_xfer(sc); 702 } 703 704 /* 705 * The current transaction is finished (for good or bad). Let go of 706 * the DMA-resources. Call biodone() to finish the transaction. 707 * Find a new transaction to work on. 708 */ 709 static void 710 fddone(register struct fd_softc *sc) 711 { 712 struct buf *bp; 713 struct fd_softc *sc1; 714 int i, s; 715 716 /* 717 * Give others a chance to use the DMA. 718 */ 719 st_dmafree(sc, &lock_stat); 720 721 722 if (fd_state != FLP_STAT) { 723 /* 724 * Finish current transaction. 725 */ 726 s = splbio(); 727 bp = bufq_get(sc->bufq); 728 if (bp == NULL) 729 panic("fddone"); 730 splx(s); 731 732 #ifdef FLP_DEBUG 733 printf("fddone: unit: %d, buf: %p, resid: %d\n",sc->unit, bp, 734 sc->io_bytes); 735 #endif 736 bp->b_resid = sc->io_bytes; 737 738 disk_unbusy(&sc->dkdev, (bp->b_bcount - bp->b_resid), 739 (bp->b_flags & B_READ)); 740 741 biodone(bp); 742 } 743 fd_state = FLP_MON; 744 745 if (lock_stat) 746 return; /* XXX Is this possible? */ 747 748 /* 749 * Find a new transaction on round-robin basis. 750 */ 751 for (i = sc->unit + 1;; i++) { 752 if (i >= fd_cd.cd_ndevs) 753 i = 0; 754 if ((sc1 = device_lookup_private(&fd_cd, i)) == NULL) 755 continue; 756 if (bufq_peek(sc1->bufq) != NULL) 757 break; 758 if (i == sc->unit) { 759 callout_reset(&sc->sc_motor_ch, FLP_MONDELAY, 760 (FPV)fdmotoroff, sc); 761 #ifdef FLP_DEBUG 762 printf("fddone: Nothing to do\n"); 763 #endif 764 return; /* No work */ 765 } 766 } 767 fd_state = FLP_IDLE; 768 #ifdef FLP_DEBUG 769 printf("fddone: Staring job on unit %d\n", sc1->unit); 770 #endif 771 st_dmagrab((dma_farg)fdcint, (dma_farg)fdstart, sc1, &lock_stat, 0); 772 } 773 774 static int 775 fdselect(int drive, int head, int dense) 776 { 777 int i, spinning; 778 779 #ifdef FLP_DEBUG 780 printf("fdselect: drive=%d, head=%d, dense=%d\n", drive, head, dense); 781 #endif 782 i = ((drive == 1) ? PA_FLOP1 : PA_FLOP0) | head; 783 spinning = motoron; 784 motoron = 1; 785 786 switch (dense) { 787 case FLP_DD: 788 DMA->dma_drvmode = 0; 789 break; 790 case FLP_HD: 791 DMA->dma_drvmode = (FDC_HDSET|FDC_HDSIG); 792 break; 793 default: 794 panic("fdselect: unknown density code"); 795 } 796 if (i != selected) { 797 selected = i; 798 ym2149_fd_select((i ^ PA_FDSEL)); 799 } 800 return spinning; 801 } 802 803 static void 804 fddeselect(void) 805 { 806 807 ym2149_fd_select(PA_FDSEL); 808 motoron = selected = 0; 809 DMA->dma_drvmode = 0; 810 } 811 812 /**************************************************************************** 813 * The following functions assume to be running as a result of a * 814 * disk-interrupt (e.q. spl = splbio). * 815 * They form the finit-state machine, the actual driver. * 816 * * 817 * fdstart()/ --> fd_xfer() -> activate hardware * 818 * fdopen() ^ * 819 * | * 820 * +-- not ready -<------------+ * 821 * | * 822 * fdmotoroff()/ --> fdcint() -> fd_xfer_ok() ---+ * 823 * h/w interrupt | * 824 * \|/ * 825 * finished ---> fdone() * 826 * * 827 ****************************************************************************/ 828 static void 829 fd_xfer(struct fd_softc *sc) 830 { 831 int head; 832 int track, sector, hbit; 833 paddr_t phys_addr; 834 835 head = track = 0; 836 switch (fd_state) { 837 case FLP_XFER: 838 /* 839 * Calculate head/track values 840 */ 841 track = sc->sector / sc->nsectors; 842 head = track % sc->nheads; 843 track = track / sc->nheads; 844 #ifdef FLP_DEBUG 845 printf("fd_xfer: sector:%d,head:%d,track:%d\n", 846 sc->sector, head, track); 847 #endif 848 break; 849 850 case FLP_STAT: 851 /* 852 * FLP_STAT only wants to recalibrate 853 */ 854 sc->curtrk = INV_TRK; 855 break; 856 default: 857 panic("fd_xfer: wrong state (0x%x)", fd_state); 858 } 859 860 /* 861 * Select the drive. 862 */ 863 hbit = fdselect(sc->unit, head, sc->density) ? HBIT : 0; 864 865 if (sc->curtrk == INV_TRK) { 866 /* 867 * Recalibrate, since we lost track of head positioning. 868 * The floppy disk controller has no way of determining its 869 * absolute arm position (track). Instead, it steps the 870 * arm a track at a time and keeps track of where it 871 * thinks it is (in software). However, after a SEEK, the 872 * hardware reads information from the diskette telling 873 * where the arm actually is. If the arm is in the wrong place, 874 * a recalibration is done, which forces the arm to track 0. 875 * This way the controller can get back into sync with reality. 876 */ 877 fd_cmd = RESTORE; 878 write_fdreg(FDC_CS, RESTORE|VBIT|hbit); 879 callout_reset(&sc->sc_motor_ch, FLP_XFERDELAY, 880 (FPV)fdmotoroff, sc); 881 882 #ifdef FLP_DEBUG 883 printf("fd_xfer:Recalibrating drive %d\n", sc->unit); 884 #endif 885 return; 886 } 887 888 write_fdreg(FDC_TR, sc->curtrk); 889 890 /* 891 * Issue a SEEK command on the indicated drive unless the arm is 892 * already positioned on the correct track. 893 */ 894 if (track != sc->curtrk) { 895 sc->curtrk = track; /* be optimistic */ 896 write_fdreg(FDC_DR, track); 897 write_fdreg(FDC_CS, SEEK|RATE6|VBIT|hbit); 898 callout_reset(&sc->sc_motor_ch, FLP_XFERDELAY, 899 (FPV)fdmotoroff, sc); 900 fd_cmd = SEEK; 901 #ifdef FLP_DEBUG 902 printf("fd_xfer:Seek to track %d on drive %d\n", 903 track, sc->unit); 904 #endif 905 return; 906 } 907 908 /* 909 * The drive is now on the proper track. Read or write 1 block. 910 */ 911 sector = sc->sector % sc->nsectors; 912 sector++; /* start numbering at 1 */ 913 914 write_fdreg(FDC_SR, sector); 915 916 phys_addr = (paddr_t)kvtop(sc->io_data); 917 if (phys_addr >= FDC_MAX_DMA_AD) { 918 /* 919 * We _must_ bounce this address 920 */ 921 phys_addr = (paddr_t)kvtop(sc->bounceb); 922 if (sc->io_dir == B_WRITE) 923 memcpy(sc->bounceb, sc->io_data, SECTOR_SIZE); 924 sc->flags |= FLPF_BOUNCE; 925 } 926 st_dmaaddr_set((void *)phys_addr); /* DMA address setup */ 927 928 #ifdef FLP_DEBUG 929 printf("fd_xfer:Start io (io_addr:%lx)\n", (u_long)kvtop(sc->io_data)); 930 #endif 931 932 if (sc->io_dir == B_READ) { 933 /* Issue the command */ 934 st_dmacomm(DMA_FDC | DMA_SCREG, 1); 935 write_fdreg(FDC_CS, F_READ|hbit); 936 fd_cmd = F_READ; 937 } else { 938 /* Issue the command */ 939 st_dmacomm(DMA_WRBIT | DMA_FDC | DMA_SCREG, 1); 940 write_fdreg(DMA_WRBIT | FDC_CS, F_WRITE|hbit|EBIT|PBIT); 941 fd_cmd = F_WRITE; 942 } 943 callout_reset(&sc->sc_motor_ch, FLP_XFERDELAY, (FPV)fdmotoroff, sc); 944 } 945 946 /* return values of fd_xfer_ok(): */ 947 #define X_OK 0 948 #define X_AGAIN 1 949 #define X_ERROR 2 950 #define X_FAIL 3 951 952 /* 953 * Hardware interrupt function. 954 */ 955 static void 956 fdcint(struct fd_softc *sc) 957 { 958 struct buf *bp; 959 960 #ifdef FLP_DEBUG 961 printf("fdcint: unit = %d\n", sc->unit); 962 #endif 963 964 /* 965 * Cancel timeout (we made it, didn't we) 966 */ 967 callout_stop(&sc->sc_motor_ch); 968 969 switch (fd_xfer_ok(sc)) { 970 case X_ERROR: 971 if (++sc->errcnt < MAX_ERRORS) { 972 /* 973 * Command failed but still retries left. 974 */ 975 break; 976 } 977 /* FALL THROUGH */ 978 case X_FAIL: 979 /* 980 * Non recoverable error. Fall back to motor-on 981 * idle-state. 982 */ 983 if (fd_error != NULL) { 984 printf("Floppy error: %s\n", fd_error); 985 fd_error = NULL; 986 } 987 988 if (fd_state == FLP_STAT) { 989 sc->flags |= FLPF_EMPTY; 990 sc->flags &= ~FLPF_GETSTAT; 991 wakeup((void *)sc); 992 fddone(sc); 993 return; 994 } 995 996 bp = bufq_peek(sc->bufq); 997 998 bp->b_error = EIO; 999 fd_state = FLP_MON; 1000 1001 break; 1002 case X_AGAIN: 1003 /* 1004 * Start next part of state machine. 1005 */ 1006 break; 1007 case X_OK: 1008 /* 1009 * Command ok and finished. Reset error-counter. 1010 * If there are no more bytes to transfer fall back 1011 * to motor-on idle state. 1012 */ 1013 sc->errcnt = 0; 1014 1015 if (fd_state == FLP_STAT) { 1016 sc->flags &= ~FLPF_GETSTAT; 1017 wakeup((void *)sc); 1018 fddone(sc); 1019 return; 1020 } 1021 1022 if ((sc->flags & FLPF_BOUNCE) != 0 && 1023 sc->io_dir == B_READ) 1024 memcpy(sc->io_data, sc->bounceb, SECTOR_SIZE); 1025 sc->flags &= ~FLPF_BOUNCE; 1026 1027 sc->sector++; 1028 sc->io_data += SECTOR_SIZE; 1029 sc->io_bytes -= SECTOR_SIZE; 1030 if (sc->io_bytes <= 0) 1031 fd_state = FLP_MON; 1032 } 1033 if (fd_state == FLP_MON) 1034 fddone(sc); 1035 else 1036 fd_xfer(sc); 1037 } 1038 1039 /* 1040 * Determine status of last command. Should only be called through 1041 * 'fdcint()'. 1042 * Returns: 1043 * X_ERROR : Error on command; might succeed next time. 1044 * X_FAIL : Error on command; will never succeed. 1045 * X_AGAIN : Part of a command succeeded, call 'fd_xfer()' to complete. 1046 * X_OK : Command succeeded and is complete. 1047 * 1048 * This function only affects sc->curtrk. 1049 */ 1050 static int 1051 fd_xfer_ok(register struct fd_softc *sc) 1052 { 1053 int status; 1054 1055 #ifdef FLP_DEBUG 1056 printf("fd_xfer_ok: cmd: 0x%x, state: 0x%x\n", fd_cmd, fd_state); 1057 #endif 1058 switch (fd_cmd) { 1059 case IRUPT: 1060 /* 1061 * Timeout. Force a recalibrate before we try again. 1062 */ 1063 status = read_fdreg(FDC_CS); 1064 1065 fd_error = "Timeout"; 1066 sc->curtrk = INV_TRK; 1067 return X_ERROR; 1068 case F_READ: 1069 /* 1070 * Test for DMA error 1071 */ 1072 status = read_dmastat(); 1073 if ((status & DMAOK) == 0) { 1074 fd_error = "DMA error"; 1075 return X_ERROR; 1076 } 1077 /* 1078 * Get controller status and check for errors. 1079 */ 1080 status = read_fdreg(FDC_CS); 1081 if ((status & (RNF | CRCERR | LD_T00)) != 0) { 1082 fd_error = "Read error"; 1083 if ((status & RNF) != 0) 1084 sc->curtrk = INV_TRK; 1085 return X_ERROR; 1086 } 1087 break; 1088 case F_WRITE: 1089 /* 1090 * Test for DMA error 1091 */ 1092 status = read_dmastat(); 1093 if ((status & DMAOK) == 0) { 1094 fd_error = "DMA error"; 1095 return X_ERROR; 1096 } 1097 /* 1098 * Get controller status and check for errors. 1099 */ 1100 status = read_fdreg(FDC_CS); 1101 if ((status & WRI_PRO) != 0) { 1102 fd_error = "Write protected"; 1103 return X_FAIL; 1104 } 1105 if ((status & (RNF | CRCERR | LD_T00)) != 0) { 1106 fd_error = "Write error"; 1107 sc->curtrk = INV_TRK; 1108 return X_ERROR; 1109 } 1110 break; 1111 case SEEK: 1112 status = read_fdreg(FDC_CS); 1113 if ((status & (RNF | CRCERR)) != 0) { 1114 fd_error = "Seek error"; 1115 sc->curtrk = INV_TRK; 1116 return X_ERROR; 1117 } 1118 return X_AGAIN; 1119 case RESTORE: 1120 /* 1121 * Determine if the recalibration succeeded. 1122 */ 1123 status = read_fdreg(FDC_CS); 1124 if ((status & RNF) != 0) { 1125 fd_error = "Recalibrate error"; 1126 /* reset controller */ 1127 write_fdreg(FDC_CS, IRUPT); 1128 sc->curtrk = INV_TRK; 1129 return X_ERROR; 1130 } 1131 sc->curtrk = 0; 1132 if (fd_state == FLP_STAT) { 1133 if ((status & WRI_PRO) != 0) 1134 sc->flags |= FLPF_WRTPROT; 1135 break; 1136 } 1137 return X_AGAIN; 1138 default: 1139 fd_error = "Driver error: fd_xfer_ok : Unknown state"; 1140 return X_FAIL; 1141 } 1142 return X_OK; 1143 } 1144 1145 /* 1146 * All timeouts will call this function. 1147 */ 1148 static void 1149 fdmotoroff(struct fd_softc *sc) 1150 { 1151 int s; 1152 1153 /* 1154 * Get at harware interrupt level 1155 */ 1156 s = splbio(); 1157 1158 #if FLP_DEBUG 1159 printf("fdmotoroff, state = 0x%x\n", fd_state); 1160 #endif 1161 1162 switch (fd_state) { 1163 case FLP_STAT: 1164 case FLP_XFER: 1165 /* 1166 * Timeout during a transfer; cancel transaction 1167 * set command to 'IRUPT'. 1168 * A drive-interrupt is simulated to trigger the state 1169 * machine. 1170 */ 1171 /* 1172 * Cancel current transaction 1173 */ 1174 fd_cmd = IRUPT; 1175 write_fdreg(FDC_CS, IRUPT); 1176 delay(20); 1177 (void)read_fdreg(FDC_CS); 1178 write_fdreg(FDC_CS, RESTORE); 1179 break; 1180 1181 case FLP_MON: 1182 /* 1183 * Turn motor off. 1184 */ 1185 if (selected) { 1186 int tmp; 1187 1188 st_dmagrab((dma_farg)fdcint, (dma_farg)fdmoff, sc, 1189 &tmp, 0); 1190 } else 1191 fd_state = FLP_IDLE; 1192 break; 1193 } 1194 splx(s); 1195 } 1196 1197 /* 1198 * min byte count to whats left of the track in question 1199 */ 1200 static void 1201 fdminphys(struct buf *bp) 1202 { 1203 struct fd_softc *sc; 1204 int sec, toff, tsz; 1205 1206 if ((sc = device_lookup_private(&fd_cd, DISKUNIT(bp->b_dev))) == NULL) 1207 panic("fdminphys: couldn't get softc"); 1208 1209 sec = bp->b_blkno % (sc->nsectors * sc->nheads); 1210 toff = sec * SECTOR_SIZE; 1211 tsz = sc->nsectors * sc->nheads * SECTOR_SIZE; 1212 1213 #ifdef FLP_DEBUG 1214 printf("fdminphys: before %ld", bp->b_bcount); 1215 #endif 1216 1217 bp->b_bcount = min(bp->b_bcount, tsz - toff); 1218 1219 #ifdef FLP_DEBUG 1220 printf(" after %ld\n", bp->b_bcount); 1221 #endif 1222 1223 minphys(bp); 1224 } 1225 1226 /* 1227 * Called from fdmotoroff to turn the motor actually off.... 1228 * This can't be done in fdmotoroff itself, because exclusive access to the 1229 * DMA controller is needed to read the FDC-status register. The function 1230 * 'fdmoff()' always runs as the result of a 'dmagrab()'. 1231 * We need to test the status-register because we want to be sure that the 1232 * drive motor is really off before deselecting the drive. The FDC only 1233 * turns off the drive motor after having seen 10 index-pulses. You only 1234 * get index-pulses when a drive is selected....This means that if the 1235 * drive is deselected when the motor is still spinning, it will continue 1236 * to spin _even_ when you insert a floppy later on... 1237 */ 1238 static void 1239 fdmoff(struct fd_softc *fdsoftc) 1240 { 1241 int tmp; 1242 1243 if ((fd_state == FLP_MON) && selected) { 1244 tmp = read_fdreg(FDC_CS); 1245 if ((tmp & MOTORON) == 0) { 1246 fddeselect(); 1247 fd_state = FLP_IDLE; 1248 } else 1249 callout_reset(&fdsoftc->sc_motor_ch, 10 * FLP_MONDELAY, 1250 (FPV)fdmotoroff, fdsoftc); 1251 } 1252 st_dmafree(fdsoftc, &tmp); 1253 } 1254 1255 /* 1256 * Used to find out wich drives are actually connected. We do this by issuing 1257 * is 'RESTORE' command and check if the 'track-0' bit is set. This also works 1258 * if the drive is present but no floppy is inserted. 1259 */ 1260 static void 1261 fdtestdrv(struct fd_softc *fdsoftc) 1262 { 1263 int status; 1264 1265 /* 1266 * Select the right unit and head. 1267 */ 1268 fdselect(fdsoftc->unit, 0, FLP_DD); 1269 1270 write_fdreg(FDC_CS, RESTORE|HBIT); 1271 1272 /* 1273 * Wait for about 2 seconds. 1274 */ 1275 delay(2000000); 1276 1277 status = read_fdreg(FDC_CS); 1278 if ((status & (RNF|BUSY)) != 0) { 1279 write_fdreg(FDC_CS, IRUPT); /* reset controller */ 1280 delay(40); 1281 } 1282 1283 if ((status & LD_T00) == 0) 1284 fdsoftc->flags |= FLPF_NOTRESP; 1285 1286 fddeselect(); 1287 } 1288 1289 static void 1290 fdgetdefaultlabel(struct fd_softc *sc, struct disklabel *lp, int part) 1291 { 1292 1293 memset(lp, 0, sizeof(struct disklabel)); 1294 1295 lp->d_secsize = SECTOR_SIZE; 1296 lp->d_ntracks = sc->nheads; 1297 lp->d_nsectors = sc->nsectors; 1298 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 1299 lp->d_ncylinders = sc->nblocks / lp->d_secpercyl; 1300 lp->d_secperunit = sc->nblocks; 1301 1302 lp->d_type = DTYPE_FLOPPY; 1303 lp->d_rpm = 300; /* good guess I suppose. */ 1304 lp->d_interleave = 1; /* FIXME: is this OK? */ 1305 lp->d_bbsize = 0; 1306 lp->d_sbsize = 0; 1307 lp->d_npartitions = part + 1; 1308 lp->d_trkseek = STEP_DELAY; 1309 lp->d_magic = DISKMAGIC; 1310 lp->d_magic2 = DISKMAGIC; 1311 lp->d_checksum = dkcksum(lp); 1312 lp->d_partitions[part].p_size = lp->d_secperunit; 1313 lp->d_partitions[part].p_fstype = FS_UNUSED; 1314 lp->d_partitions[part].p_fsize = 1024; 1315 lp->d_partitions[part].p_frag = 8; 1316 } 1317 1318 /* 1319 * Build disk label. For now we only create a label from what we know 1320 * from 'sc'. 1321 */ 1322 static int 1323 fdgetdisklabel(struct fd_softc *sc, dev_t dev) 1324 { 1325 struct disklabel *lp; 1326 int part; 1327 1328 /* 1329 * If we already got one, get out. 1330 */ 1331 if ((sc->flags & FLPF_HAVELAB) != 0) 1332 return 0; 1333 1334 #ifdef FLP_DEBUG 1335 printf("fdgetdisklabel()\n"); 1336 #endif 1337 1338 part = RAW_PART; 1339 lp = sc->dkdev.dk_label; 1340 fdgetdefaultlabel(sc, lp, part); 1341 sc->flags |= FLPF_HAVELAB; 1342 1343 return 0; 1344 } 1345