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sys/i386/isa/wt.c
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1 2 /* 3 * Streamer tape driver for 386bsd and FreeBSD. 4 * Supports Archive and Wangtek compatible QIC-02/QIC-36 boards. 5 * 6 * Copyright (C) 1993 by: 7 * Sergey Ryzhkov <sir@kiae.su> 8 * Serge Vakulenko <vak@zebub.msk.su> 9 * 10 * This software is distributed with NO WARRANTIES, not even the implied 11 * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 12 * 13 * Authors grant any other persons or organisations permission to use 14 * or modify this software as long as this message is kept with the software, 15 * all derivative works or modified versions. 16 * 17 * This driver is derived from the old 386bsd Wangtek streamer tape driver, 18 * made by Robert Baron at CMU, based on Intel sources. 19 * Authors thank Robert Baron, CMU and Intel and retain here 20 * the original CMU copyright notice. 21 * 22 * Version 1.3, Thu Nov 11 12:09:13 MSK 1993 23 * $FreeBSD$ 24 * 25 */ 26 27 /* 28 * Code for MTERASE added by John Lind (john@starfire.mn.org) 95/09/02. 29 * This was very easy due to the excellent structure and clear coding 30 * of the original driver. 31 */ 32 33 /* 34 * Copyright (c) 1989 Carnegie-Mellon University. 35 * All rights reserved. 36 * 37 * Authors: Robert Baron 38 * 39 * Permission to use, copy, modify and distribute this software and 40 * its documentation is hereby granted, provided that both the copyright 41 * notice and this permission notice appear in all copies of the 42 * software, derivative works or modified versions, and any portions 43 * thereof, and that both notices appear in supporting documentation. 44 * 45 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 46 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 47 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 48 * 49 * Carnegie Mellon requests users of this software to return to 50 * 51 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 52 * School of Computer Science 53 * Carnegie Mellon University 54 * Pittsburgh PA 15213-3890 55 * 56 * any improvements or extensions that they make and grant Carnegie the 57 * rights to redistribute these changes. 58 */ 59 60 #include "wt.h" 61 62 #include <sys/param.h> 63 #include <sys/systm.h> 64 #include <sys/kernel.h> 65 #include <sys/buf.h> 66 #include <sys/fcntl.h> 67 #include <sys/malloc.h> 68 #include <sys/mtio.h> 69 #include <sys/conf.h> 70 71 #include <machine/clock.h> 72 73 #include <i386/isa/isa_device.h> 74 #include <i386/isa/wtreg.h> 75 76 77 /* 78 * Uncomment this to enable internal device tracing. 79 */ 80 #define TRACE(s) /* printf s */ 81 82 #define WTPRI (PZERO+10) /* sleep priority */ 83 84 /* 85 * Wangtek controller ports 86 */ 87 #define WT_CTLPORT(base) ((base)+0) /* control, write only */ 88 #define WT_STATPORT(base) ((base)+0) /* status, read only */ 89 #define WT_CMDPORT(base) ((base)+1) /* command, write only */ 90 #define WT_DATAPORT(base) ((base)+1) /* data, read only */ 91 #define WT_NPORT 2 /* 2 i/o ports */ 92 93 /* status port bits */ 94 #define WT_BUSY 0x01 /* not ready bit define */ 95 #define WT_NOEXCEP 0x02 /* no exception bit define */ 96 #define WT_RESETMASK 0x07 /* to check after reset */ 97 #define WT_RESETVAL 0x05 /* state after reset */ 98 99 /* control port bits */ 100 #define WT_ONLINE 0x01 /* device selected */ 101 #define WT_RESET 0x02 /* reset command */ 102 #define WT_REQUEST 0x04 /* request command */ 103 #define WT_IEN 0x08 /* enable dma */ 104 105 /* 106 * Archive controller ports 107 */ 108 #define AV_DATAPORT(base) ((base)+0) /* data, read only */ 109 #define AV_CMDPORT(base) ((base)+0) /* command, write only */ 110 #define AV_STATPORT(base) ((base)+1) /* status, read only */ 111 #define AV_CTLPORT(base) ((base)+1) /* control, write only */ 112 #define AV_SDMAPORT(base) ((base)+2) /* start dma */ 113 #define AV_RDMAPORT(base) ((base)+3) /* reset dma */ 114 #define AV_NPORT 4 /* 4 i/o ports */ 115 116 /* status port bits */ 117 #define AV_BUSY 0x40 /* not ready bit define */ 118 #define AV_NOEXCEP 0x20 /* no exception bit define */ 119 #define AV_RESETMASK 0xf8 /* to check after reset */ 120 #define AV_RESETVAL 0x50 /* state after reset */ 121 122 /* control port bits */ 123 #define AV_RESET 0x80 /* reset command */ 124 #define AV_REQUEST 0x40 /* request command */ 125 #define AV_IEN 0x20 /* enable interrupts */ 126 127 enum wttype { 128 UNKNOWN = 0, /* unknown type, driver disabled */ 129 ARCHIVE, /* Archive Viper SC499, SC402 etc */ 130 WANGTEK /* Wangtek */ 131 }; 132 133 typedef struct { 134 unsigned short err; /* code for error encountered */ 135 unsigned short ercnt; /* number of error blocks */ 136 unsigned short urcnt; /* number of underruns */ 137 } wtstatus_t; 138 139 typedef struct { 140 enum wttype type; /* type of controller */ 141 unsigned unit; /* unit number */ 142 unsigned port; /* base i/o port */ 143 unsigned chan; /* dma channel number, 1..3 */ 144 unsigned flags; /* state of tape drive */ 145 unsigned dens; /* tape density */ 146 int bsize; /* tape block size */ 147 void *buf; /* internal i/o buffer */ 148 149 void *dmavaddr; /* virtual address of dma i/o buffer */ 150 unsigned dmatotal; /* size of i/o buffer */ 151 unsigned dmaflags; /* i/o direction, ISADMA_READ or ISADMA_WRITE */ 152 unsigned dmacount; /* resulting length of dma i/o */ 153 154 wtstatus_t error; /* status of controller */ 155 156 unsigned short DATAPORT, CMDPORT, STATPORT, CTLPORT, SDMAPORT, RDMAPORT; 157 unsigned char BUSY, NOEXCEP, RESETMASK, RESETVAL; 158 unsigned char ONLINE, RESET, REQUEST, IEN; 159 } wtinfo_t; 160 161 static wtinfo_t wttab[NWT]; /* tape info by unit number */ 162 163 static int wtwait (wtinfo_t *t, int catch, char *msg); 164 static int wtcmd (wtinfo_t *t, int cmd); 165 static int wtstart (wtinfo_t *t, unsigned mode, void *vaddr, unsigned len); 166 static void wtdma (wtinfo_t *t); 167 static timeout_t wtimer; 168 static void wtclock (wtinfo_t *t); 169 static int wtreset (wtinfo_t *t); 170 static int wtsense (wtinfo_t *t, int verb, int ignor); 171 static int wtstatus (wtinfo_t *t); 172 static ointhand2_t wtintr; 173 static void wtrewind (wtinfo_t *t); 174 static int wtreadfm (wtinfo_t *t); 175 static int wtwritefm (wtinfo_t *t); 176 static int wtpoll (wtinfo_t *t, int mask, int bits); 177 178 static d_open_t wtopen; 179 static d_close_t wtclose; 180 static d_ioctl_t wtioctl; 181 static d_strategy_t wtstrategy; 182 183 #define CDEV_MAJOR 10 184 185 static struct cdevsw wt_cdevsw = { 186 /* open */ wtopen, 187 /* close */ wtclose, 188 /* read */ physread, 189 /* write */ physwrite, 190 /* ioctl */ wtioctl, 191 /* poll */ nopoll, 192 /* mmap */ nommap, 193 /* strategy */ wtstrategy, 194 /* name */ "wt", 195 /* maj */ CDEV_MAJOR, 196 /* dump */ nodump, 197 /* psize */ nopsize, 198 /* flags */ 0, 199 /* bmaj */ -1 200 }; 201 202 203 /* 204 * Probe for the presence of the device. 205 */ 206 static int 207 wtprobe (struct isa_device *id) 208 { 209 wtinfo_t *t = wttab + id->id_unit; 210 static int once; 211 212 if (!once++) 213 cdevsw_add(&wt_cdevsw); 214 215 t->unit = id->id_unit; 216 t->chan = id->id_drq; 217 t->port = id->id_iobase; 218 if (t->chan<1 || t->chan>3) { 219 printf ("wt%d: Bad drq=%d, should be 1..3\n", t->unit, t->chan); 220 return (0); 221 } 222 223 /* Try Wangtek. */ 224 t->type = WANGTEK; 225 t->CTLPORT = WT_CTLPORT (t->port); t->STATPORT = WT_STATPORT (t->port); 226 t->CMDPORT = WT_CMDPORT (t->port); t->DATAPORT = WT_DATAPORT (t->port); 227 t->SDMAPORT = 0; t->RDMAPORT = 0; 228 t->BUSY = WT_BUSY; t->NOEXCEP = WT_NOEXCEP; 229 t->RESETMASK = WT_RESETMASK; t->RESETVAL = WT_RESETVAL; 230 t->ONLINE = WT_ONLINE; t->RESET = WT_RESET; 231 t->REQUEST = WT_REQUEST; t->IEN = WT_IEN; 232 if (wtreset (t)) 233 return (WT_NPORT); 234 235 /* Try Archive. */ 236 t->type = ARCHIVE; 237 t->CTLPORT = AV_CTLPORT (t->port); t->STATPORT = AV_STATPORT (t->port); 238 t->CMDPORT = AV_CMDPORT (t->port); t->DATAPORT = AV_DATAPORT (t->port); 239 t->SDMAPORT = AV_SDMAPORT (t->port); t->RDMAPORT = AV_RDMAPORT (t->port); 240 t->BUSY = AV_BUSY; t->NOEXCEP = AV_NOEXCEP; 241 t->RESETMASK = AV_RESETMASK; t->RESETVAL = AV_RESETVAL; 242 t->ONLINE = 0; t->RESET = AV_RESET; 243 t->REQUEST = AV_REQUEST; t->IEN = AV_IEN; 244 if (wtreset (t)) 245 return (AV_NPORT); 246 247 /* Tape controller not found. */ 248 t->type = UNKNOWN; 249 return (0); 250 } 251 252 /* 253 * Device is found, configure it. 254 */ 255 static int 256 wtattach (struct isa_device *id) 257 { 258 wtinfo_t *t = wttab + id->id_unit; 259 260 id->id_ointr = wtintr; 261 if (t->type == ARCHIVE) { 262 printf ("wt%d: type <Archive>\n", t->unit); 263 outb (t->RDMAPORT, 0); /* reset dma */ 264 } else 265 printf ("wt%d: type <Wangtek>\n", t->unit); 266 t->flags = TPSTART; /* tape is rewound */ 267 t->dens = -1; /* unknown density */ 268 isa_dmainit(t->chan, 1024); 269 270 make_dev(&wt_cdevsw, id->id_unit, 0, 0, 0600, "rwt%d", id->id_unit); 271 return (1); 272 } 273 274 struct isa_driver wtdriver = { wtprobe, wtattach, "wt", }; 275 276 /* 277 * Open routine, called on every device open. 278 */ 279 static int 280 wtopen (dev_t dev, int flag, int fmt, struct proc *p) 281 { 282 int u = minor (dev) & T_UNIT; 283 wtinfo_t *t = wttab + u; 284 int error; 285 286 if (u >= NWT || t->type == UNKNOWN) 287 return (ENXIO); 288 289 /* Check that device is not in use */ 290 if (t->flags & TPINUSE) 291 return (EBUSY); 292 293 /* If the tape is in rewound state, check the status and set density. */ 294 if (t->flags & TPSTART) { 295 /* If rewind is going on, wait */ 296 error = wtwait (t, PCATCH, "wtrew"); 297 if (error) 298 return (error); 299 300 /* Check the controller status */ 301 if (! wtsense (t, 0, (flag & FWRITE) ? 0 : TP_WRP)) { 302 /* Bad status, reset the controller */ 303 if (! wtreset (t)) 304 return (EIO); 305 if (! wtsense (t, 1, (flag & FWRITE) ? 0 : TP_WRP)) 306 return (EIO); 307 } 308 309 /* Set up tape density. */ 310 if (t->dens != (minor (dev) & WT_DENSEL)) { 311 int d = 0; 312 313 switch (minor (dev) & WT_DENSEL) { 314 case WT_DENSDFLT: default: break; /* default density */ 315 case WT_QIC11: d = QIC_FMT11; break; /* minor 010 */ 316 case WT_QIC24: d = QIC_FMT24; break; /* minor 020 */ 317 case WT_QIC120: d = QIC_FMT120; break; /* minor 030 */ 318 case WT_QIC150: d = QIC_FMT150; break; /* minor 040 */ 319 case WT_QIC300: d = QIC_FMT300; break; /* minor 050 */ 320 case WT_QIC600: d = QIC_FMT600; break; /* minor 060 */ 321 } 322 if (d) { 323 /* Change tape density. */ 324 if (! wtcmd (t, d)) 325 return (EIO); 326 if (! wtsense (t, 1, TP_WRP | TP_ILL)) 327 return (EIO); 328 329 /* Check the status of the controller. */ 330 if (t->error.err & TP_ILL) { 331 printf ("wt%d: invalid tape density\n", t->unit); 332 return (ENODEV); 333 } 334 } 335 t->dens = minor (dev) & WT_DENSEL; 336 } 337 t->flags &= ~TPSTART; 338 } else if (t->dens != (minor (dev) & WT_DENSEL)) 339 return (ENXIO); 340 341 t->bsize = (minor (dev) & WT_BSIZE) ? 1024 : 512; 342 t->buf = malloc (t->bsize, M_TEMP, M_WAITOK); 343 if (! t->buf) 344 return (EAGAIN); 345 346 if (isa_dma_acquire(t->chan)) 347 return(EBUSY); 348 349 t->flags = TPINUSE; 350 351 if (flag & FREAD) 352 t->flags |= TPREAD; 353 if (flag & FWRITE) 354 t->flags |= TPWRITE; 355 return (0); 356 } 357 358 /* 359 * Close routine, called on last device close. 360 */ 361 static int 362 wtclose (dev_t dev, int flags, int fmt, struct proc *p) 363 { 364 int u = minor (dev) & T_UNIT; 365 wtinfo_t *t = wttab + u; 366 367 if (u >= NWT || t->type == UNKNOWN) 368 return (ENXIO); 369 370 /* If rewind is pending, do nothing */ 371 if (t->flags & TPREW) 372 goto done; 373 374 /* If seek forward is pending and no rewind on close, do nothing */ 375 if (t->flags & TPRMARK) { 376 if (minor (dev) & T_NOREWIND) 377 goto done; 378 379 /* If read file mark is going on, wait */ 380 wtwait (t, 0, "wtrfm"); 381 } 382 383 if (t->flags & TPWANY) 384 /* Tape was written. Write file mark. */ 385 wtwritefm (t); 386 387 if (! (minor (dev) & T_NOREWIND)) { 388 /* Rewind tape to beginning of tape. */ 389 /* Don't wait until rewind, though. */ 390 wtrewind (t); 391 goto done; 392 } 393 if ((t->flags & TPRANY) && ! (t->flags & (TPVOL | TPWANY))) 394 /* Space forward to after next file mark if no writing done. */ 395 /* Don't wait for completion. */ 396 wtreadfm (t); 397 done: 398 t->flags &= TPREW | TPRMARK | TPSTART | TPTIMER; 399 free (t->buf, M_TEMP); 400 isa_dma_release(t->chan); 401 return (0); 402 } 403 404 /* 405 * Ioctl routine. Compatible with BSD ioctls. 406 * There are two possible ioctls: 407 * ioctl (int fd, MTIOCGET, struct mtget *buf) -- get status 408 * ioctl (int fd, MTIOCTOP, struct mtop *buf) -- do BSD-like op 409 */ 410 static int 411 wtioctl (dev_t dev, u_long cmd, caddr_t arg, int flags, struct proc *p) 412 { 413 int u = minor (dev) & T_UNIT; 414 wtinfo_t *t = wttab + u; 415 int error, count, op; 416 417 if (u >= NWT || t->type == UNKNOWN) 418 return (ENXIO); 419 420 switch (cmd) { 421 default: 422 return (EINVAL); 423 case MTIOCIEOT: /* ignore EOT errors */ 424 case MTIOCEEOT: /* enable EOT errors */ 425 return (0); 426 case MTIOCGET: 427 ((struct mtget*)arg)->mt_type = 428 t->type == ARCHIVE ? MT_ISVIPER1 : 0x11; 429 ((struct mtget*)arg)->mt_dsreg = t->flags; /* status */ 430 ((struct mtget*)arg)->mt_erreg = t->error.err; /* errors */ 431 ((struct mtget*)arg)->mt_resid = 0; 432 ((struct mtget*)arg)->mt_fileno = 0; /* file */ 433 ((struct mtget*)arg)->mt_blkno = 0; /* block */ 434 return (0); 435 case MTIOCTOP: 436 break; 437 } 438 switch ((short) ((struct mtop*)arg)->mt_op) { 439 default: 440 case MTFSR: /* forward space record */ 441 case MTBSR: /* backward space record */ 442 case MTBSF: /* backward space file */ 443 break; 444 case MTNOP: /* no operation, sets status only */ 445 case MTCACHE: /* enable controller cache */ 446 case MTNOCACHE: /* disable controller cache */ 447 return (0); 448 case MTREW: /* rewind */ 449 case MTOFFL: /* rewind and put the drive offline */ 450 if (t->flags & TPREW) /* rewind is running */ 451 return (0); 452 error = wtwait (t, PCATCH, "wtorew"); 453 if (error) 454 return (error); 455 wtrewind (t); 456 return (0); 457 case MTFSF: /* forward space file */ 458 for (count=((struct mtop*)arg)->mt_count; count>0; --count) { 459 error = wtwait (t, PCATCH, "wtorfm"); 460 if (error) 461 return (error); 462 error = wtreadfm (t); 463 if (error) 464 return (error); 465 } 466 return (0); 467 case MTWEOF: /* write an end-of-file record */ 468 if (! (t->flags & TPWRITE) || (t->flags & TPWP)) 469 return (EACCES); 470 error = wtwait (t, PCATCH, "wtowfm"); 471 if (error) 472 return (error); 473 error = wtwritefm (t); 474 if (error) 475 return (error); 476 return (0); 477 case MTRETENS: /* re-tension tape */ 478 error = wtwait (t, PCATCH, "wtretens"); 479 if (error) 480 return (error); 481 op = QIC_RETENS; 482 goto erase_retens; 483 484 case MTERASE: /* erase to EOM */ 485 if (! (t->flags & TPWRITE) || (t->flags & TPWP)) 486 return (EACCES); 487 error = wtwait (t, PCATCH, "wterase"); 488 if (error) 489 return (error); 490 op = QIC_ERASE; 491 erase_retens: 492 /* ERASE and RETENS operations work like REWIND. */ 493 /* Simulate the rewind operation here. */ 494 t->flags &= ~(TPRO | TPWO | TPVOL); 495 if (! wtcmd (t, op)) 496 return (EIO); 497 t->flags |= TPSTART | TPREW; 498 t->flags |= TPWANY; 499 wtclock (t); 500 return (0); 501 } 502 return (EINVAL); 503 } 504 505 /* 506 * Strategy routine. 507 */ 508 static void 509 wtstrategy (struct buf *bp) 510 { 511 int u = minor (bp->b_dev) & T_UNIT; 512 wtinfo_t *t = wttab + u; 513 int s; 514 515 bp->b_resid = bp->b_bcount; 516 if (u >= NWT || t->type == UNKNOWN) { 517 bp->b_error = ENXIO; 518 goto err2xit; 519 } 520 521 /* at file marks and end of tape, we just return '0 bytes available' */ 522 if (t->flags & TPVOL) 523 goto xit; 524 525 if (bp->b_bcount % t->bsize != 0) { 526 bp->b_error = EINVAL; 527 goto err2xit; 528 } 529 530 if (bp->b_flags & B_READ) { 531 /* Check read access and no previous write to this tape. */ 532 if (! (t->flags & TPREAD) || (t->flags & TPWANY)) 533 goto errxit; 534 535 /* For now, we assume that all data will be copied out */ 536 /* If read command outstanding, just skip down */ 537 if (! (t->flags & TPRO)) { 538 if (! wtsense (t, 1, TP_WRP)) /* clear status */ 539 goto errxit; 540 if (! wtcmd (t, QIC_RDDATA)) { /* sed read mode */ 541 wtsense (t, 1, TP_WRP); 542 goto errxit; 543 } 544 t->flags |= TPRO | TPRANY; 545 } 546 } else { 547 /* Check write access and write protection. */ 548 /* No previous read from this tape allowed. */ 549 if (! (t->flags & TPWRITE) || (t->flags & (TPWP | TPRANY))) 550 goto errxit; 551 552 /* If write command outstanding, just skip down */ 553 if (! (t->flags & TPWO)) { 554 if (! wtsense (t, 1, 0)) /* clear status */ 555 goto errxit; 556 if (! wtcmd (t, QIC_WRTDATA)) { /* set write mode */ 557 wtsense (t, 1, 0); 558 goto errxit; 559 } 560 t->flags |= TPWO | TPWANY; 561 } 562 } 563 564 if (! bp->b_bcount) 565 goto xit; 566 567 t->flags &= ~TPEXCEP; 568 s = splbio (); 569 if (wtstart (t, bp->b_flags & B_READ ? ISADMA_READ : ISADMA_WRITE, bp->b_data, bp->b_bcount)) { 570 wtwait (t, 0, (bp->b_flags & B_READ) ? "wtread" : "wtwrite"); 571 bp->b_resid -= t->dmacount; 572 } 573 splx (s); 574 575 if (t->flags & TPEXCEP) { 576 errxit: bp->b_error = EIO; 577 err2xit: bp->b_flags |= B_ERROR; 578 } 579 xit: biodone (bp); 580 return; 581 } 582 583 /* 584 * Interrupt routine. 585 */ 586 static void 587 wtintr (int u) 588 { 589 wtinfo_t *t = wttab + u; 590 unsigned char s; 591 592 if (u >= NWT || t->type == UNKNOWN) { 593 TRACE (("wtintr() -- device not configured\n")); 594 return; 595 } 596 597 s = inb (t->STATPORT); /* get status */ 598 TRACE (("wtintr() status=0x%x -- ", s)); 599 if ((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP)) { 600 TRACE (("busy\n")); 601 return; /* device is busy */ 602 } 603 604 /* 605 * Check if rewind finished. 606 */ 607 if (t->flags & TPREW) { 608 TRACE (((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP) ? 609 "rewind busy?\n" : "rewind finished\n")); 610 t->flags &= ~TPREW; /* Rewind finished. */ 611 wtsense (t, 1, TP_WRP); 612 wakeup ((caddr_t)t); 613 return; 614 } 615 616 /* 617 * Check if writing/reading of file mark finished. 618 */ 619 if (t->flags & (TPRMARK | TPWMARK)) { 620 TRACE (((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP) ? 621 "marker r/w busy?\n" : "marker r/w finished\n")); 622 if (! (s & t->NOEXCEP)) /* operation failed */ 623 wtsense (t, 1, (t->flags & TPRMARK) ? TP_WRP : 0); 624 t->flags &= ~(TPRMARK | TPWMARK); /* operation finished */ 625 wakeup ((caddr_t)t); 626 return; 627 } 628 629 /* 630 * Do we started any i/o? If no, just return. 631 */ 632 if (! (t->flags & TPACTIVE)) { 633 TRACE (("unexpected interrupt\n")); 634 return; 635 } 636 637 /* 638 * Clean up dma. 639 */ 640 if ((t->dmaflags & ISADMA_READ) && (t->dmatotal - t->dmacount) < t->bsize) { 641 /* If reading short block, copy the internal buffer 642 * to the user memory. */ 643 isa_dmadone (t->dmaflags, t->buf, t->bsize, t->chan); 644 bcopy (t->buf, t->dmavaddr, t->dmatotal - t->dmacount); 645 } else 646 isa_dmadone (t->dmaflags, t->dmavaddr, t->bsize, t->chan); 647 648 t->flags &= ~TPACTIVE; 649 t->dmacount += t->bsize; 650 t->dmavaddr = (char *)t->dmavaddr + t->bsize; 651 652 /* 653 * On exception, check for end of file and end of volume. 654 */ 655 if (! (s & t->NOEXCEP)) { 656 TRACE (("i/o exception\n")); 657 wtsense (t, 1, (t->dmaflags & ISADMA_READ) ? TP_WRP : 0); 658 if (t->error.err & (TP_EOM | TP_FIL)) 659 t->flags |= TPVOL; /* end of file */ 660 else 661 t->flags |= TPEXCEP; /* i/o error */ 662 wakeup ((caddr_t)t); 663 return; 664 } 665 666 if (t->dmacount < t->dmatotal) { /* continue i/o */ 667 wtdma (t); 668 TRACE (("continue i/o, %d\n", t->dmacount)); 669 return; 670 } 671 if (t->dmacount > t->dmatotal) /* short last block */ 672 t->dmacount = t->dmatotal; 673 wakeup ((caddr_t)t); /* wake up user level */ 674 TRACE (("i/o finished, %d\n", t->dmacount)); 675 } 676 677 /* start the rewind operation */ 678 static void 679 wtrewind (wtinfo_t *t) 680 { 681 int rwmode = (t->flags & (TPRO | TPWO)); 682 683 t->flags &= ~(TPRO | TPWO | TPVOL); 684 /* 685 * Wangtek strictly follows QIC-02 standard: 686 * clearing ONLINE in read/write modes causes rewind. 687 * REWIND command is not allowed in read/write mode 688 * and gives `illegal command' error. 689 */ 690 if (t->type==WANGTEK && rwmode) { 691 outb (t->CTLPORT, 0); 692 } else if (! wtcmd (t, QIC_REWIND)) 693 return; 694 t->flags |= TPSTART | TPREW; 695 wtclock (t); 696 } 697 698 /* start the `read marker' operation */ 699 static int 700 wtreadfm (wtinfo_t *t) 701 { 702 t->flags &= ~(TPRO | TPWO | TPVOL); 703 if (! wtcmd (t, QIC_READFM)) { 704 wtsense (t, 1, TP_WRP); 705 return (EIO); 706 } 707 t->flags |= TPRMARK | TPRANY; 708 wtclock (t); 709 /* Don't wait for completion here. */ 710 return (0); 711 } 712 713 /* write marker to the tape */ 714 static int 715 wtwritefm (wtinfo_t *t) 716 { 717 tsleep ((caddr_t)wtwritefm, WTPRI, "wtwfm", hz); /* timeout: 1 second */ 718 t->flags &= ~(TPRO | TPWO); 719 if (! wtcmd (t, QIC_WRITEFM)) { 720 wtsense (t, 1, 0); 721 return (EIO); 722 } 723 t->flags |= TPWMARK | TPWANY; 724 wtclock (t); 725 return (wtwait (t, 0, "wtwfm")); 726 } 727 728 /* while controller status & mask == bits continue waiting */ 729 static int 730 wtpoll (wtinfo_t *t, int mask, int bits) 731 { 732 int s, i; 733 734 /* Poll status port, waiting for specified bits. */ 735 for (i=0; i<1000; ++i) { /* up to 1 msec */ 736 s = inb (t->STATPORT); 737 if ((s & mask) != bits) 738 return (s); 739 DELAY (1); 740 } 741 for (i=0; i<100; ++i) { /* up to 10 msec */ 742 s = inb (t->STATPORT); 743 if ((s & mask) != bits) 744 return (s); 745 DELAY (100); 746 } 747 for (;;) { /* forever */ 748 s = inb (t->STATPORT); 749 if ((s & mask) != bits) 750 return (s); 751 tsleep ((caddr_t)wtpoll, WTPRI, "wtpoll", 1); /* timeout: 1 tick */ 752 } 753 } 754 755 /* execute QIC command */ 756 static int 757 wtcmd (wtinfo_t *t, int cmd) 758 { 759 int s, x; 760 761 TRACE (("wtcmd() cmd=0x%x\n", cmd)); 762 x = splbio(); 763 s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */ 764 if (! (s & t->NOEXCEP)) { /* error */ 765 splx(x); 766 return (0); 767 } 768 769 outb (t->CMDPORT, cmd); /* output the command */ 770 771 outb (t->CTLPORT, t->REQUEST | t->ONLINE); /* set request */ 772 wtpoll (t, t->BUSY, t->BUSY); /* wait for ready */ 773 outb (t->CTLPORT, t->IEN | t->ONLINE); /* reset request */ 774 wtpoll (t, t->BUSY, 0); /* wait for not ready */ 775 splx(x); 776 return (1); 777 } 778 779 /* wait for the end of i/o, seeking marker or rewind operation */ 780 static int 781 wtwait (wtinfo_t *t, int catch, char *msg) 782 { 783 int error; 784 785 TRACE (("wtwait() `%s'\n", msg)); 786 while (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK)) { 787 error = tsleep ((caddr_t)t, WTPRI | catch, msg, 0); 788 if (error) 789 return (error); 790 } 791 return (0); 792 } 793 794 /* initialize dma for the i/o operation */ 795 static void 796 wtdma (wtinfo_t *t) 797 { 798 t->flags |= TPACTIVE; 799 wtclock (t); 800 801 if (t->type == ARCHIVE) 802 outb (t->SDMAPORT, 0); /* set dma */ 803 804 if ((t->dmaflags & ISADMA_READ) && (t->dmatotal - t->dmacount) < t->bsize) 805 /* Reading short block. Do it through the internal buffer. */ 806 isa_dmastart (t->dmaflags, t->buf, t->bsize, t->chan); 807 else 808 isa_dmastart (t->dmaflags, t->dmavaddr, t->bsize, t->chan); 809 } 810 811 /* start i/o operation */ 812 static int 813 wtstart (wtinfo_t *t, unsigned flags, void *vaddr, unsigned len) 814 { 815 int s, x; 816 817 TRACE (("wtstart()\n")); 818 x = splbio(); 819 s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */ 820 if (! (s & t->NOEXCEP)) { 821 t->flags |= TPEXCEP; /* error */ 822 splx(x); 823 return (0); 824 } 825 t->flags &= ~TPEXCEP; /* clear exception flag */ 826 t->dmavaddr = vaddr; 827 t->dmatotal = len; 828 t->dmacount = 0; 829 t->dmaflags = flags; 830 wtdma (t); 831 splx(x); 832 return (1); 833 } 834 835 /* start timer */ 836 static void 837 wtclock (wtinfo_t *t) 838 { 839 if (! (t->flags & TPTIMER)) { 840 t->flags |= TPTIMER; 841 /* Some controllers seem to lose dma interrupts too often. 842 * To make the tape stream we need 1 tick timeout. */ 843 timeout (wtimer, (caddr_t)t, (t->flags & TPACTIVE) ? 1 : hz); 844 } 845 } 846 847 /* 848 * Simulate an interrupt periodically while i/o is going. 849 * This is necessary in case interrupts get eaten due to 850 * multiple devices on a single IRQ line. 851 */ 852 static void 853 wtimer (void *xt) 854 { 855 wtinfo_t *t = (wtinfo_t *)xt; 856 int s; 857 858 t->flags &= ~TPTIMER; 859 if (! (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK))) 860 return; 861 862 /* If i/o going, simulate interrupt. */ 863 s = splbio (); 864 if ((inb (t->STATPORT) & (t->BUSY | t->NOEXCEP)) != (t->BUSY | t->NOEXCEP)) { 865 TRACE (("wtimer() -- ")); 866 wtintr (t->unit); 867 } 868 splx (s); 869 870 /* Restart timer if i/o pending. */ 871 if (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK)) 872 wtclock (t); 873 } 874 875 /* reset the controller */ 876 static int 877 wtreset (wtinfo_t *t) 878 { 879 /* Perform QIC-02 and QIC-36 compatible reset sequence. */ 880 /* Thanks to Mikael Hybsch <micke@dynas.se>. */ 881 int s, i; 882 883 outb (t->CTLPORT, t->RESET | t->ONLINE); /* send reset */ 884 DELAY (30); 885 outb (t->CTLPORT, t->ONLINE); /* turn off reset */ 886 DELAY (30); 887 888 /* Read the controller status. */ 889 s = inb (t->STATPORT); 890 if (s == 0xff) /* no port at this address? */ 891 return (0); 892 893 /* Wait 3 sec for reset to complete. Needed for QIC-36 boards? */ 894 for (i=0; i<3000; ++i) { 895 if (! (s & t->BUSY) || ! (s & t->NOEXCEP)) 896 break; 897 DELAY (1000); 898 s = inb (t->STATPORT); 899 } 900 return ((s & t->RESETMASK) == t->RESETVAL); 901 } 902 903 /* get controller status information */ 904 /* return 0 if user i/o request should receive an i/o error code */ 905 static int 906 wtsense (wtinfo_t *t, int verb, int ignor) 907 { 908 char *msg = 0; 909 int err; 910 911 TRACE (("wtsense() ignor=0x%x\n", ignor)); 912 t->flags &= ~(TPRO | TPWO); 913 if (! wtstatus (t)) 914 return (0); 915 if (! (t->error.err & TP_ST0)) 916 t->error.err &= ~TP_ST0MASK; 917 if (! (t->error.err & TP_ST1)) 918 t->error.err &= ~TP_ST1MASK; 919 t->error.err &= ~ignor; /* ignore certain errors */ 920 err = t->error.err & (TP_FIL | TP_BNL | TP_UDA | TP_EOM | TP_WRP | 921 TP_USL | TP_CNI | TP_MBD | TP_NDT | TP_ILL); 922 if (! err) 923 return (1); 924 if (! verb) 925 return (0); 926 927 /* lifted from tdriver.c from Wangtek */ 928 if (err & TP_USL) msg = "Drive not online"; 929 else if (err & TP_CNI) msg = "No cartridge"; 930 else if ((err & TP_WRP) && !(t->flags & TPWP)) { 931 msg = "Tape is write protected"; 932 t->flags |= TPWP; 933 } 934 else if (err & TP_FIL) msg = 0 /*"Filemark detected"*/; 935 else if (err & TP_EOM) msg = 0 /*"End of tape"*/; 936 else if (err & TP_BNL) msg = "Block not located"; 937 else if (err & TP_UDA) msg = "Unrecoverable data error"; 938 else if (err & TP_NDT) msg = "No data detected"; 939 else if (err & TP_ILL) msg = "Illegal command"; 940 if (msg) 941 printf ("wt%d: %s\n", t->unit, msg); 942 return (0); 943 } 944 945 /* get controller status information */ 946 static int 947 wtstatus (wtinfo_t *t) 948 { 949 char *p; 950 int x; 951 952 x = splbio(); 953 wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */ 954 outb (t->CMDPORT, QIC_RDSTAT); /* send `read status' command */ 955 956 outb (t->CTLPORT, t->REQUEST | t->ONLINE); /* set request */ 957 wtpoll (t, t->BUSY, t->BUSY); /* wait for ready */ 958 outb (t->CTLPORT, t->ONLINE); /* reset request */ 959 wtpoll (t, t->BUSY, 0); /* wait for not ready */ 960 961 p = (char*) &t->error; 962 while (p < (char*)&t->error + 6) { 963 int s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); 964 if (! (s & t->NOEXCEP)) { /* error */ 965 splx(x); 966 return (0); 967 } 968 969 *p++ = inb (t->DATAPORT); /* read status byte */ 970 971 outb (t->CTLPORT, t->REQUEST | t->ONLINE); /* set request */ 972 wtpoll (t, t->BUSY, 0); /* wait for not ready */ 973 DELAY(20); 974 outb (t->CTLPORT, t->ONLINE); /* unset request */ 975 } 976 splx(x); 977 return (1); 978 }
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