wt.c revision 1.8
1 /*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * from: @(#)wt.c 7.1 (Berkeley) 5/9/91 34 * $Id: wt.c,v 1.8 1994/03/06 17:19:22 mycroft Exp $ 35 */ 36 37 /* 38 * 39 * Copyright (c) 1989 Carnegie-Mellon University. 40 * All rights reserved. 41 * 42 * Authors: Robert Baron 43 * 44 * Permission to use, copy, modify and distribute this software and 45 * its documentation is hereby granted, provided that both the copyright 46 * notice and this permission notice appear in all copies of the 47 * software, derivative works or modified versions, and any portions 48 * thereof, and that both notices appear in supporting documentation. 49 * 50 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 51 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 52 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 53 * 54 * Carnegie Mellon requests users of this software to return to 55 * 56 * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 57 * School of Computer Science 58 * Carnegie Mellon University 59 * Pittsburgh PA 15213-3890 60 * 61 * any improvements or extensions that they make and grant Carnegie the 62 * rights to redistribute these changes. 63 */ 64 65 #include "wt.h" 66 #if NWT > 0 67 68 /* 69 * 70 * Copyright 1988, 1989 by Intel Corporation 71 * 72 * Support Bell Tech QIC-02 and WANGTEK QIC-36 or QIC-02 73 */ 74 75 #include <sys/param.h> 76 #include <sys/buf.h> 77 #include <sys/file.h> 78 #include <sys/proc.h> 79 #include <sys/user.h> 80 81 #include <machine/pio.h> 82 83 #include <i386/isa/wtreg.h> 84 85 #ifdef ORC 86 unsigned wtport = 0x288; /* base I/O port of controller */ 87 #else ORC 88 unsigned wtport = 0x300; /* base I/O port of controller */ 89 #endif ORC 90 /* standard = 0x300 */ 91 /* alternate = 0x338 */ 92 93 unsigned wtchan = 1; /* DMA channel number */ 94 /* stardard = 1 */ 95 /* hardware permits 1, 2 or 3. */ 96 /* (Avoid DMA 2: used by disks) */ 97 98 int first_wtopen_ever = 1; 99 100 101 #define ERROR 1 /* return from tape routines */ 102 #define SUCCESS 0 /* return from tape routines */ 103 104 int wci = 0; 105 int exflag = 0; 106 int bytes = 0; 107 108 static unsigned char eqdma = 0x8; 109 static unsigned char pagereg = 0x83; 110 static unsigned char dmareg = 2; 111 static unsigned char dma_write = 0x49; 112 static unsigned char dma_read = 0x45; 113 static unsigned char dma_done = 2; 114 static unsigned char mode = 0; 115 static unsigned char mbits; /* map bits into each other */ 116 static long bufptr; 117 static unsigned numbytes; 118 /* 119 _wci dw 0 ; interrupt chain finished normally 120 _exflag dw 0 ; exception variable 121 _bytes dw 0 ; current bytes 122 123 eqdma db 8h ; enable dma command: ch1,ch2=8h, ch3=10h 124 pagereg db 83h ; ch1=83h, ch2=81h, ch3=82h 125 dmareg db 2 ; ch1=2, ch2=4, ch3=6 126 dma_write db 49h ; write dma command: 48h+_wtchan 127 dma_read db 45h ; read dma command: 44h+_wtchan 128 dma_done db 2 ; dma done flag: 1<<_wtchan 129 mode db 0 ; dma operation mode 130 lbufptr dw 0 ; buffer pointer to data buffers, low word 131 hbufptr dw 0 ; buffer pointer to data buffers, high word 132 numbytes dw 0 ; number of bytes to read or write (new) 133 */ 134 135 #define PAGESIZ 4096 136 #define HZ 60 137 138 /* tape controller ports */ 139 #define STATPORT wtport 140 #define CTLPORT STATPORT 141 #define CMDPORT (wtport+1) 142 #define DATAPORT CMDPORT 143 144 /* defines for reading out status from wangtek tape controller */ 145 #define READY 0x01 /* ready bit define */ 146 #define EXCEP 0x02 /* exception bit define */ 147 #define STAT (READY|EXCEP) 148 #define RESETMASK 0x7 149 #define RESETVAL (RESETMASK & ~EXCEP) 150 151 /* tape controller control bits (CTLPORT) */ 152 #define ONLINE 0x01 153 #define RESET 0x02 154 #define REQUEST 0x04 /* request command */ 155 #define CMDOFF 0xC0 156 157 /* QIC-02 commands (CMDPORT) */ 158 #define RDDATA 0x80 /* read data */ 159 #define READFM 0xA0 /* read file mark */ 160 #define WRTDATA 0x40 /* write data */ 161 #define WRITEFM 0x60 /* write file mark */ 162 #define RDSTAT 0xC0 /* read status command */ 163 #define REWIND 0x21 /* rewind command (position+bot) */ 164 165 /* 8237 DMA controller regs */ 166 #define STATUSREG 0x8 167 #define MASKREG 0xA 168 #define MODEREG 0xB 169 #define CLEARFF 0xC 170 171 /* streamer tape block size */ 172 #define BLKSIZE 512 173 174 /* Tape characteristics */ 175 #define NBPS 512 /* 512-byte blocks */ 176 #define ERROR 1 /* return from tape routines */ 177 #define SUCCESS 0 /* return from tape routines */ 178 179 /* Minor devs */ 180 #define TP_REWCLOSE(d) ((minor(d)&04) == 0) /* Rewind tape on close if read/write */ 181 #define TP_DENS(dev) ((minor(dev) >> 3) & 03) /* set density */ 182 #define TPHOG(d) 0 /* use Hogproc during tape I/O */ 183 184 /* defines for wtflags */ 185 #define TPINUSE 0x0001 /* tape is already open */ 186 #define TPREAD 0x0002 /* tape is only open for reading */ 187 #define TPWRITE 0x0004 /* tape is only open for writing */ 188 #define TPSTART 0x0008 /* tape must be rewound and reset */ 189 #define TPDEAD 0x0010 /* tape drive does not work or driver error */ 190 #define TPSESS 0x0020 /* no more reads or writes allowed in session */ 191 /* for example, when tape has to be changed */ 192 #define TPSTOP 0x0040 /* Stop command outstanding */ 193 #define TPREW 0x0080 /* Rewind command outstanding, see wtdsl2() */ 194 #define TPVOL 0x0100 /* Read file mark, or hit end of tape */ 195 #define TPWO 0x0200 /* write command outstanding */ 196 #define TPRO 0x0400 /* read command outstanding */ 197 #define TPWANY 0x0800 /* write command requested */ 198 #define TPRANY 0x1000 /* read command requested */ 199 #define TPWP 0x2000 /* write protect error seen */ 200 201 unsigned int wtflags = TPSTART; /* state of tape drive */ 202 203 struct buf rwtbuf; /* header for raw i/o */ 204 struct proc *myproc; /* process which opened tape driver */ 205 206 char wtimeron; /* wtimer() active flag */ 207 char wtio; /* dma (i/o) active flag */ 208 char isrlock; /* isr() flag */ 209 210 struct proc * Hogproc; /* no Hogproc on Microport */ 211 #define ftoseg(x) ((unsigned) (x >> 16)) 212 213 struct wtstatus { 214 ushort wt_err; /* code for error encountered */ 215 ushort wt_ercnt; /* number of error blocks */ 216 ushort wt_urcnt; /* number of underruns */ 217 } wterror; 218 219 /* defines for wtstatus.wt_err */ 220 #define TP_POR 0x100 /* Power on/reset occurred */ 221 #define TP_RES1 0x200 /* Reserved for end of media */ 222 #define TP_RES2 0x400 /* Reserved for bus parity */ 223 #define TP_BOM 0x800 /* Beginning of media */ 224 #define TP_MBD 0x1000 /* Marginal block detected */ 225 #define TP_NDT 0x2000 /* No data detected */ 226 #define TP_ILL 0x4000 /* Illegal command */ 227 #define TP_ST1 0x8000 /* Status byte 1 bits */ 228 #define TP_FIL 0x01 /* File mark detected */ 229 #define TP_BNL 0x02 /* Bad block not located */ 230 #define TP_UDA 0x04 /* Unrecoverable data error */ 231 #define TP_EOM 0x08 /* End of media */ 232 #define TP_WRP 0x10 /* Write protected cartridge */ 233 #define TP_USL 0x20 /* Unselected drive */ 234 #define TP_CNI 0x40 /* Cartridge not in place */ 235 #define TP_ST0 0x80 /* Status byte 0 bits */ 236 237 /* Grounds for reporting I/O error to user */ 238 #define TP_ERR0 (TP_BNL|TP_UDA|TP_WRP|TP_CNI|TP_FIL|TP_EOM|TP_USL) 239 #define TP_ERR1 (TP_MBD|TP_NDT|TP_ILL) 240 /* TP_ILL should never happen! */ 241 /* 242 #define TP_ERR0 0x7f 243 #define TP_ERR1 0x7700 244 */ 245 246 /* defines for reading out status from wangtek tape controller */ 247 #define READY 0x01 /* ready bit define */ 248 #define EXCEP 0x02 /* exception bit define */ 249 250 /* sleep priority */ 251 #define WTPRI (PZERO+10) 252 253 char pagebuf[NBPS]; /* buffer of size NBPS */ 254 unsigned long pageaddr; /* physical addr of pagebuf */ 255 /* pageaddr is used with DMA controller */ 256 time_t Hogtime; /* lbolt when Hog timer started */ 257 extern time_t lbolt; 258 259 #define debug printf 260 261 /* 262 * Strategy routine. 263 * 264 * Arguments: 265 * Pointer to buffer structure 266 * Function: 267 * Start transfer. 268 * 269 * It would be nice to have this multiple-threaded. 270 * There is a version of dump from Berkeley that works with multiple processes 271 * trading off with disk & tape I/O. 272 */ 273 274 int 275 wtstrategy(bp) 276 register struct buf *bp; 277 { 278 unsigned ucnt1, ucnt2, finished; 279 unsigned long adr1, adr2; 280 int bad; 281 282 adr1 = kvtop(bp->b_un.b_addr); 283 #ifdef DEBUG 284 debug("bpaddr %x\n", adr1); 285 #endif 286 ucnt1 = bp->b_bcount % NBPG; 287 ucnt2 = 0; 288 adr2 = 0; 289 #ifdef DEBUG 290 debug("WTstart: adr1 %lx cnt %x\n", adr1, ucnt1); 291 #endif 292 /* 64K boundary? (XXX) */ 293 if (ftoseg(adr1) != ftoseg(adr1 + (unsigned) ucnt1 - 1)) 294 { 295 adr2 = (adr1 & 0xffff0000L) + 0x10000L; 296 ucnt2 = (adr1 + ucnt1) - adr2; 297 ucnt1 -= ucnt2; 298 } 299 /* page boundary? */ 300 if (trunc_page(adr1) != trunc_page(adr1 + (unsigned) ucnt1 - 1)) 301 { unsigned u; 302 u = NBPG - ((unsigned)bp->b_un.b_addr & (NBPG-1)); 303 adr2 = kvtop(bp->b_un.b_addr + u); 304 ucnt2 = ucnt1 - u; 305 ucnt1 = u; 306 } 307 /* at file marks and end of tape, we just return '0 bytes available' */ 308 if (wtflags & TPVOL) { 309 bp->b_resid = bp->b_bcount; 310 goto xit; 311 } 312 if ((Hogproc == (struct proc *) 0) && TPHOG(bp->b_dev)) 313 { 314 #ifdef DEBUG 315 printf("setting Hogproc\n"); 316 #endif 317 Hogtime = 0; 318 Hogproc = myproc; 319 } 320 if (bp->b_flags & B_READ) { 321 bad = 0; 322 323 /* For now, we assume that all data will be copied out */ 324 /* If read command outstanding, just skip down */ 325 if (!(wtflags & TPRO)) { 326 if (ERROR == wtsense(TP_WRP)) /* clear status */ 327 goto errxit; 328 #ifdef DEBUG 329 debug("WTread: Start read\n"); 330 #endif 331 if (!(wtflags & TPREAD) || (wtflags & TPWANY) || 332 (rstart() == ERROR)) { 333 #ifdef DEBUG 334 debug("Tpstart: read init error\n"); /* */ 335 #endif 336 goto errxit; 337 } 338 wtflags |= TPRO|TPRANY; 339 } 340 341 finished = 0; 342 /* Take a deep breath */ 343 if (ucnt1) { 344 if ((rtape(adr1, ucnt1) == ERROR) && 345 (wtsense(TP_WRP) == ERROR)) 346 goto endio; 347 /* wait for it */ 348 bad = pollrdy(); 349 finished = bytes; 350 if (bad) 351 goto endio; 352 } 353 /* if a second I/O region, start it */ 354 if (ucnt2) { 355 if ((rtape(adr2, ucnt2) == ERROR) && 356 (wtsense(TP_WRP) == ERROR)) 357 ucnt2 = 0; /* don't poll for me */ 358 } 359 360 /* if second i/o pending wait for it */ 361 if (ucnt2) { 362 pollrdy(); 363 /* whether pollrdy is ok or not */ 364 finished += bytes; 365 } 366 } else { 367 if (wtflags & TPWP) /* write protected */ 368 goto errxit; 369 370 /* If write command outstanding, just skip down */ 371 if (!(wtflags & TPWO)) { 372 if (ERROR == wtsense(0)) /* clear status */ 373 { 374 #ifdef DEBUG 375 debug("TPstart: sense 0\n"); 376 #endif 377 goto errxit; 378 } 379 if (!(wtflags & TPWRITE) || (wtflags & TPRANY) || 380 (wstart() == ERROR)) { 381 #ifdef DEBUG 382 debug("Tpstart: write init error\n"); /* */ 383 #endif 384 wtsense(0); 385 386 errxit: bp->b_flags |= B_ERROR; 387 bp->b_resid = bp->b_bcount; 388 goto xit; 389 } 390 wtflags |= TPWO|TPWANY; 391 } 392 393 /* and hold your nose */ 394 if (ucnt1 && ((wtape(adr1, ucnt1) == ERROR) 395 && (wtsense(0) == ERROR))) 396 finished = bytes; 397 398 else if (ucnt2 && 399 (((ucnt1 && pollrdy()) || 400 (wtape(adr2, ucnt2) == ERROR)) && 401 (wtsense(0) == ERROR))) 402 finished = ucnt1 + NBPS + bytes; 403 /* All writes and/or copyins were fine! */ 404 else 405 finished = bp->b_bcount; 406 bad = pollrdy(); 407 } 408 409 endio: 410 if(bad == EIO) bad = 0; 411 wterror.wt_err = 0; 412 if (exflag && wtsense((bp->b_flags & B_READ) ? TP_WRP : 0)) { 413 if ((wterror.wt_err & TP_ST0) 414 && (wterror.wt_err & (TP_FIL|TP_EOM))) { 415 #ifdef DEBUG 416 debug("WTsta: Hit end of tape\n"); /* */ 417 #endif 418 wtflags |= TPVOL; 419 if (wterror.wt_err & TP_FIL) { 420 if (wtflags & TPRO) 421 /* interrupter is bogus */ 422 rstart(); /* restart read command */ 423 else 424 wtflags &= ~TPWO; 425 finished += NBPS; 426 } 427 /* Reading file marks or writing end of tape return 0 bytes */ 428 } else { 429 bp->b_flags |= B_ERROR; 430 wtflags &= ~(TPWO|TPRO); 431 } 432 } 433 434 if(bad) { 435 bp->b_flags |= B_ERROR; 436 bp->b_error = bad; 437 } 438 bp->b_resid = bp->b_bcount - finished; 439 xit: 440 biodone(bp); 441 if (wtimeron) 442 Hogtime = lbolt; 443 else if (Hogproc == myproc) 444 Hogproc = (struct proc *) 0; 445 } 446 447 /* 448 * simulate an interrupt periodically while I/O is going 449 * this is necessary in case interrupts get eaten due to 450 * multiple devices on a single IRQ line 451 */ 452 wtimer() 453 { 454 /* If I/O going and not in isr(), simulate interrupt 455 * If no I/O for at least 1 second, stop being a Hog 456 * If I/O done and not a Hog, turn off wtimer() 457 */ 458 if (wtio && !isrlock) 459 isr(); 460 461 if ((Hogproc == myproc) && Hogtime && (lbolt-Hogtime > HZ)) 462 Hogproc = (struct proc *) 0; 463 464 if (wtio || (Hogproc == myproc)) 465 timeout(wtimer, (caddr_t) 0, HZ); 466 else 467 wtimeron = 0; 468 } 469 470 471 wtrawio(bp) 472 struct buf *bp; 473 { 474 wtstrategy(bp); 475 biowait(bp); 476 return(0); 477 } 478 479 /* 480 * ioctl routine 481 * for user level QIC commands only 482 */ 483 wtioctl(dev, cmd, arg, mode, p) 484 int dev, cmd; 485 unsigned long arg; 486 int mode; 487 struct proc *p; 488 { 489 if (cmd == WTQICMD) 490 { 491 if ((qicmd((int)arg) == ERROR) || (rdyexc(HZ) == ERROR)) 492 { 493 wtsense(0); 494 return(EIO); 495 } 496 return(0); 497 } 498 return(EINVAL); 499 } 500 501 /* 502 * open routine 503 * called on every device open 504 */ 505 wtopen(dev, flag) 506 int dev, flag; 507 { 508 if (first_wtopen_ever) { 509 wtinit(); 510 first_wtopen_ever = 0; 511 } 512 #ifdef DEBUG 513 printf("wtopen ...\n"); 514 #endif 515 if (!pageaddr) { 516 return(ENXIO); 517 } 518 if (wtflags & (TPINUSE)) { 519 return(ENXIO); 520 } 521 if (wtflags & (TPDEAD)) { 522 return(EIO); 523 } 524 /* If a rewind from the last session is going on, wait */ 525 while(wtflags & TPREW) { 526 #ifdef DEBUG 527 debug("Waiting for rew to finish\n"); 528 #endif 529 delay(1000000); /* delay one second */ 530 } 531 /* Only do reset and select when tape light is off, and tape is rewound. 532 * This allows multiple volumes. */ 533 if (wtflags & TPSTART) { 534 if (t_reset() != SUCCESS) { 535 return(ENXIO); 536 } 537 #ifdef DEBUG 538 debug("reset done. calling wtsense\n"); 539 #endif 540 if (wtsense(TP_WRP) == ERROR) { 541 return (EIO); 542 } 543 #ifdef DEBUG 544 debug("wtsense done\n"); 545 #endif 546 wtflags &= ~TPSTART; 547 } 548 549 wtflags = TPINUSE; 550 if (flag & FREAD) 551 wtflags |= TPREAD; 552 if (flag & FWRITE) 553 wtflags |= TPWRITE; 554 rwtbuf.b_flags = 0; 555 myproc = curproc; /* for comparison */ 556 #ifdef not 557 switch(TP_DENS(dev)) { 558 case 0: 559 cmds(0x28); 560 break; 561 case 1: 562 cmds(0x29); 563 break; 564 case 2: 565 cmds(0x27); 566 break; 567 case 3: 568 cmds(0x24); 569 } 570 #endif 571 return(0); 572 } 573 574 /* 575 * close routine 576 * called on last device close 577 * If not rewind-on-close, leave read or write command intact. 578 */ 579 wtclose(dev) 580 { 581 int wtdsl2(); 582 583 #ifdef DEBUG 584 debug("WTclose:\n"); 585 #endif 586 if (Hogproc == myproc) 587 Hogproc = (struct proc *) 0; 588 if (!exflag && (wtflags & TPWANY) && !(wtflags & (TPSESS|TPDEAD))) { 589 if (!(wtflags & TPWO)) 590 wstart(); 591 #ifdef DEBUG 592 debug("WT: Writing file mark\n"); 593 #endif 594 wmark(); /* write file mark */ 595 #ifdef DEBUG 596 debug("WT: Wrote file mark, going to wait\n"); 597 #endif 598 if (rdyexc(HZ/10) == ERROR) { 599 wtsense(0); 600 } 601 } 602 if (TP_REWCLOSE(dev) || (wtflags & (TPSESS|TPDEAD))) { 603 /* rewind tape to beginning of tape, deselect tape, and make a note */ 604 /* don't wait until rewind, though */ 605 /* Ending read or write causes rewind to happen, if no error, 606 * and READY and EXCEPTION stay up until it finishes */ 607 if (wtflags & (TPRO|TPWO)) 608 { 609 #ifdef DEBUG 610 debug("End read or write\n"); 611 #endif 612 rdyexc(HZ/10); 613 ioend(); 614 wtflags &= ~(TPRO|TPWO); 615 } 616 else wtwind(); 617 wtflags |= TPSTART | TPREW; 618 timeout(wtdsl2, 0, HZ); 619 } 620 else if (!(wtflags & (TPVOL|TPWANY))) 621 { 622 /* space forward to after next file mark no writing done */ 623 /* This allows skipping data without reading it.*/ 624 #ifdef DEBUG 625 debug("Reading past file mark\n"); 626 #endif 627 if (!(wtflags & TPRO)) 628 rstart(); 629 rmark(); 630 if (rdyexc(HZ/10)) 631 { 632 wtsense(TP_WRP); 633 } 634 } 635 wtflags &= TPREW|TPDEAD|TPSTART|TPRO|TPWO; 636 return(0); 637 } 638 639 /* return ERROR if user I/O request should receive an I/O error code */ 640 641 wtsense(ignor) 642 { 643 wtflags &= ~(TPRO|TPWO); 644 #ifdef DEBUGx 645 debug("WTsense: start "); 646 #endif 647 if (rdstatus(&wterror) == ERROR) 648 { 649 #ifdef DEBUG 650 debug("WTsense: Can't read status\n"); 651 #endif 652 return(ERROR); 653 } 654 #ifdef DEBUG 655 if (wterror.wt_err & (TP_ST0|TP_ST1)) 656 { 657 debug("Tperror: status %x error %d underruns %d\n", 658 wterror.wt_err, wterror.wt_ercnt, wterror.wt_urcnt); 659 } 660 else 661 debug("done. no error\n"); 662 #endif 663 wterror.wt_err &= ~ignor; /* ignore certain errors */ 664 reperr(wterror.wt_err); 665 if (((wterror.wt_err & TP_ST0) && (wterror.wt_err & TP_ERR0)) || 666 ((wterror.wt_err & TP_ST1) && (wterror.wt_err & TP_ERR1))) 667 return ERROR; 668 669 return SUCCESS; 670 } 671 672 /* lifted from tdriver.c from Wangtek */ 673 reperr(srb0) 674 int srb0; 675 { 676 int s0 = srb0 & (TP_ERR0|TP_ERR1); /* find out which exception to report */ 677 678 if (s0) { 679 if (s0 & TP_USL) 680 sterr("Drive not online"); 681 else if (s0 & TP_CNI) 682 sterr("No cartridge"); 683 else if ((s0 & TP_WRP) && !(wtflags & TPWP)) 684 { 685 sterr("Tape is write protected"); 686 wtflags |= TPWP; 687 } 688 /* 689 if (s0 & TP_FIL) 690 sterr("Filemark detected"); 691 */ 692 else if (s0 & TP_BNL) 693 sterr("Block in error not located"); 694 else if (s0 & TP_UDA) 695 sterr("Unrecoverable data error"); 696 /* 697 else if (s0 & TP_EOM) 698 sterr("End of tape"); 699 */ 700 else if (s0 & TP_NDT) 701 sterr("No data detected"); 702 /* 703 if (s0 & TP_POR) 704 sterr("Reset occured"); 705 */ 706 else if (s0 & TP_BOM) 707 sterr("Beginning of tape"); 708 else if (s0 & TP_ILL) 709 sterr("Illegal command"); 710 } 711 } 712 713 sterr(errstr) 714 char *errstr; 715 { 716 printf("Streamer: %s\n", errstr); 717 } 718 719 /* Wait until rewind finishes, and deselect drive */ 720 wtdsl2() { 721 int stat; 722 723 stat = inb(wtport) & (READY|EXCEP); 724 #ifdef DEBUG 725 debug("Timeout: Waiting for rewind to finish: stat %x\n", stat); 726 #endif 727 switch (stat) { 728 /* They're active low, ya'know */ 729 case READY|EXCEP: 730 timeout(wtdsl2, (caddr_t) 0, HZ); 731 return; 732 case EXCEP: 733 wtflags &= ~TPREW; 734 return; 735 case READY: 736 case 0: 737 wtflags &= ~TPREW; 738 sterr("Rewind failed"); 739 wtsense(TP_WRP); 740 return; 741 } 742 } 743 744 wtwind() { 745 #ifdef DEBUG 746 debug("WT: About to rewind\n"); 747 #endif 748 rwind(); /* actually start rewind */ 749 } 750 751 wtintr(unit) { 752 if (wtflags & (TPWO|TPRO)) 753 { 754 isrlock = 1; 755 if (wtio) isr(); 756 isrlock = 0; 757 } 758 } 759 760 wtinit() { 761 if (wtchan < 1 || wtchan > 3) 762 { 763 sterr("Bad DMA channel, cannot init driver"); 764 return; 765 } 766 wtlinit(); /* init assembly language variables */ 767 pageset(); 768 } 769 770 rdyexc(ticks) 771 { 772 int s; 773 #ifdef DEBUG 774 int os = 0xffff; /* force printout first time */ 775 #endif 776 for (;;) { /* loop until ready or exception */ 777 s=(inb(wtport) & 0xff); /* read the status register */ 778 #ifdef DEBUG 779 if (os != s) { 780 debug("Status reg = %x\n", s); /* */ 781 os = s; 782 } 783 #endif 784 if (!(s & EXCEP)) /* check if exception have occured */ 785 break; 786 if (!(s & READY)) /* check if controller is ready */ 787 break; 788 s = splbio(); 789 delay((ticks/HZ)*1000000); /* */ 790 splx(s); 791 } 792 #ifdef DEBUG 793 debug("Status reg = %x on return\n", s); /* */ 794 #endif 795 return((s & EXCEP)?SUCCESS:ERROR); /* return exception if it occured */ 796 } 797 798 pollrdy() 799 { 800 int sps; 801 #ifdef DEBUG 802 debug("Pollrdy\n"); 803 #endif 804 sps = splbio(); 805 while (wtio) { 806 int error; 807 808 if (error = tsleep((caddr_t)&wci, WTPRI | PCATCH, 809 "wtpoll", 0)) { 810 splx(sps); 811 return(error); 812 } 813 } 814 splx(sps); 815 #ifdef DEBUG 816 debug("Finish poll, wci %d exflag %d\n", wci, exflag); 817 #endif 818 return (EIO); 819 } 820 821 wtdma() /* start up i/o operation, called from dma() in wtlib1.s */ 822 { 823 wtio = 1; 824 if (!wtimeron) 825 { 826 wtimeron = 1; 827 timeout(wtimer, (caddr_t) 0, HZ/2); 828 } 829 } 830 831 wtwake() /* end i/o operation, called from isr() in wtlib1.s */ 832 { 833 wtio = 0; 834 wakeup(&wci); 835 } 836 837 pageset() 838 { 839 unsigned long pp; 840 841 pp = (unsigned long) pagebuf; 842 pageaddr = kvtop(pp); 843 #ifdef DEBUG 844 debug("pageset: addr %lx\n", pageaddr); 845 #endif 846 } 847 848 849 850 #define near 851 852 static near 853 sendcmd() 854 { 855 /* desired command in global mbits */ 856 857 outb(CTLPORT, mbits | REQUEST); /* set request */ 858 while (inb(STATPORT) & READY); /* wait for ready */ 859 outb(CTLPORT, mbits & ~REQUEST); /* reset request */ 860 while ((inb(STATPORT) & READY) == 0); /* wait for not ready */ 861 } 862 863 static near /* execute command */ 864 cmds(cmd) 865 { 866 register s; 867 868 do s = inb(STATPORT); 869 while ((s & STAT) == STAT); /* wait for ready */ 870 871 if ((s & EXCEP) == 0) /* if exception */ 872 return ERROR; /* error */ 873 874 outb(CMDPORT, cmd); /* output the command */ 875 876 outb(CTLPORT, mbits=ONLINE); /* set & send ONLINE */ 877 sendcmd(); 878 879 return SUCCESS; 880 } 881 882 qicmd(cmd) 883 { 884 return cmds(cmd); 885 } 886 887 rstart() 888 { 889 return cmds(RDDATA); 890 } 891 892 rmark() 893 { 894 return cmds(READFM); 895 } 896 897 wstart() 898 { 899 return cmds(WRTDATA); 900 } 901 902 ioend() 903 { 904 register s; 905 register rval = SUCCESS; 906 907 do s = inb(STATPORT); 908 while ((s & STAT) == STAT); /* wait for ready */ 909 910 if ((s & EXCEP) == 0) /* if exception */ 911 rval = ERROR; /* error */ 912 913 mbits &= ~ONLINE; 914 outb(CTLPORT, mbits); /* reset ONLINE */ 915 outb(MASKREG, wtchan+4); /* turn off dma */ 916 outb(CLEARFF, 0); /* reset direction flag */ 917 918 return rval; 919 } 920 921 wmark() 922 { 923 register s; 924 925 if (cmds(WRITEFM) == ERROR) 926 return ERROR; 927 928 do s = inb(STATPORT); 929 while ((s & STAT) == STAT); /* wait for ready */ 930 931 if ((s & EXCEP) == 0) /* if exception */ 932 return ERROR; /* error */ 933 934 return SUCCESS; 935 } 936 937 rwind() 938 { 939 register s; 940 941 mbits = CMDOFF; 942 943 do s = inb(STATPORT); 944 while ((s & STAT) == STAT); /* wait for ready */ 945 946 outb(CMDPORT, REWIND); 947 sendcmd(); 948 949 return SUCCESS; 950 } 951 952 rdstatus(stp) 953 char *stp; /* pointer to 6 byte buffer */ 954 { 955 register s; 956 int n; 957 958 do s = inb(STATPORT); 959 while ((s & STAT) == STAT); /* wait for ready or exception */ 960 961 outb(CMDPORT, RDSTAT); 962 sendcmd(); /* send read status command */ 963 964 for (n=0; n<6; n++) 965 { 966 #ifdef DEBUGx 967 debug("rdstatus: waiting, byte %d\n", n); 968 #endif 969 do s = inb(STATPORT); 970 while ((s & STAT) == STAT); /* wait for ready */ 971 #ifdef DEBUGx 972 debug("rdstatus: done\n"); 973 #endif 974 if ((s & EXCEP) == 0) /* if exception */ 975 return ERROR; /* error */ 976 977 *stp++ = inb(DATAPORT); /* read status byte */ 978 979 outb(CTLPORT, mbits | REQUEST); /* set request */ 980 #ifdef DEBUGx 981 debug("rdstatus: waiting after request, byte %d\n", n); 982 #endif 983 while ((inb(STATPORT)&READY) == 0); /* wait for not ready */ 984 for (s=100; s>0; s--); /* wait an additional time */ 985 986 outb(CTLPORT, mbits & ~REQUEST);/* unset request */ 987 #ifdef DEBUGx 988 debug("rdstatus: done\n"); 989 #endif 990 } 991 return SUCCESS; 992 } 993 994 t_reset() 995 { 996 register i; 997 mbits |= RESET; 998 outb(CTLPORT, mbits); /* send reset */ 999 delay(20); 1000 mbits &= ~RESET; 1001 outb(CTLPORT, mbits); /* turn off reset */ 1002 if ((inb(STATPORT) & RESETMASK) == RESETVAL) 1003 return SUCCESS; 1004 return ERROR; 1005 } 1006 1007 static 1008 dma() 1009 { 1010 int x=splbio(); 1011 wtdma(); 1012 outb(CLEARFF, 0); 1013 outb(MODEREG, mode); /* set dma mode */ 1014 outb(dmareg, bufptr & 0xFF); 1015 outb(dmareg, (bufptr>>8) & 0xFF); 1016 outb(pagereg, (bufptr>>16) & 0xFF); 1017 outb(dmareg+1, (BLKSIZE-1) & 0xFF); 1018 outb(dmareg+1, (BLKSIZE-1) >> 8); 1019 outb(wtport, eqdma+ONLINE); 1020 outb(MASKREG, wtchan); /* enable command to 8237, start dma */ 1021 splx(x); 1022 } 1023 1024 static near 1025 wtstart(buf, cnt) 1026 long buf; 1027 int cnt; 1028 { 1029 register s; 1030 1031 bufptr = buf; /* init statics */ 1032 numbytes = cnt; 1033 wci = 0; /* init flags */ 1034 exflag = 0; 1035 bytes = 0; /* init counter */ 1036 1037 do s = inb(STATPORT) & STAT; 1038 while (s == STAT); /* wait for ready or error */ 1039 1040 if (s & EXCEP) /* no error */ 1041 { 1042 dma(); 1043 return SUCCESS; 1044 } 1045 return ERROR; /* error */ 1046 } 1047 1048 rtape(buf, cnt) 1049 long buf; /* physical address */ 1050 int cnt; /* number of bytes */ 1051 { 1052 mode = dma_read; 1053 return wtstart(buf,cnt); 1054 } 1055 1056 wtape(buf, cnt) 1057 long buf; /* physical address */ 1058 int cnt; /* number of bytes */ 1059 { 1060 mode = dma_write; 1061 return wtstart(buf,cnt); 1062 } 1063 1064 isr() 1065 { 1066 int stat = inb(wtport); 1067 if (!(stat & EXCEP)) /* exception during I/O */ 1068 { 1069 if (bytes + BLKSIZE >= numbytes) wci = 1; 1070 exflag = 1; 1071 goto isrwake; 1072 } 1073 if ((stat & READY) || !(inb(STATUSREG) & dma_done)) 1074 return; 1075 exflag = 0; 1076 outb(wtport, ONLINE); 1077 bytes += BLKSIZE; 1078 if (bytes >= numbytes) /* normal completion of I/O */ 1079 { 1080 wci = 1; 1081 isrwake: 1082 outb(MASKREG, 4+wtchan); /* turn off dma */ 1083 wtwake(); /* wake up user level */ 1084 } 1085 else 1086 { /* continue I/O */ 1087 bufptr += BLKSIZE; 1088 dma(); 1089 } 1090 } 1091 1092 wtlinit() 1093 { 1094 switch (wtchan) { 1095 case 1: 1096 return; 1097 case 2: 1098 pagereg = 0x81; 1099 dma_done = 4; 1100 break; 1101 case 3: 1102 eqdma = 0x10; 1103 pagereg = 0x82; 1104 dma_done = 8; 1105 break; 1106 } 1107 dma_write = wtchan+0x48; 1108 dma_read = wtchan+0x44; 1109 dmareg = wtchan+wtchan; 1110 } 1111 1112 wtsize() 1113 { 1114 } 1115 1116 wtdump() 1117 { 1118 } 1119 1120 #include <i386/isa/isa_device.h> 1121 #include <i386/isa/icu.h> 1122 1123 int wtprobe(), wtattach(); 1124 struct isa_driver wtdriver = { 1125 wtprobe, wtattach, "wt", 1126 }; 1127 1128 wtprobe(dvp) 1129 struct isa_device *dvp; 1130 { 1131 int val,i,s; 1132 1133 #ifdef lint 1134 wtintr(0); 1135 #endif 1136 1137 wtport = dvp->id_iobase; 1138 if(t_reset() != SUCCESS) return(0); 1139 return(1); 1140 } 1141 1142 wtattach() { } 1143 1144 #endif NWT 1145
Indexes created Sat Oct 25 01:09:55 GMT 2025