wt.c revision 1.1
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 * @(#)wt.c 7.1 (Berkeley) 5/9/91 34 */ 35 36 /* 37 * 38 * Copyright (c) 1989 Carnegie-Mellon University. 39 * All rights reserved. 40 * 41 * Authors: Robert Baron 42 * 43 * Permission to use, copy, modify and distribute this software and 44 * its documentation is hereby granted, provided that both the copyright 45 * notice and this permission notice appear in all copies of the 46 * software, derivative works or modified versions, and any portions 47 * thereof, and that both notices appear in supporting documentation. 48 * 49 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 50 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 51 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 52 * 53 * Carnegie Mellon requests users of this software to return to 54 * 55 * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 56 * School of Computer Science 57 * Carnegie Mellon University 58 * Pittsburgh PA 15213-3890 59 * 60 * any improvements or extensions that they make and grant Carnegie the 61 * rights to redistribute these changes. 62 */ 63 64 #include "wt.h" 65 #if NWT > 0 66 /* 67 * HISTORY 68 * $Log: wt.c,v $ 69 * Revision 1.1 1993/03/21 09:45:37 cgd 70 * Initial revision 71 * 72 * Revision 2.2.1.3 90/01/08 13:29:38 rvb 73 * Add Intel copyright. 74 * [90/01/08 rvb] 75 * 76 * Revision 2.2.1.2 89/12/21 18:00:09 rvb 77 * Change WTPRI to make the streamer tape read/write 78 * interruptible. [lin] 79 * 80 * Revision 2.2.1.1 89/11/10 09:49:49 rvb 81 * ORC likes their streamer port at 0x288. 82 * [89/11/08 rvb] 83 * 84 * Revision 2.2 89/09/25 12:33:02 rvb 85 * Driver was provided by Intel 9/18/89. 86 * [89/09/23 rvb] 87 * 88 */ 89 90 /* 91 * 92 * Copyright 1988, 1989 by Intel Corporation 93 * 94 * Support Bell Tech QIC-02 and WANGTEK QIC-36 or QIC-02 95 */ 96 97 /*#include <sys/errno.h> 98 #include <sys/signal.h> 99 #include <sys/types.h>*/ 100 #include "sys/param.h" 101 #include "sys/buf.h" 102 #include "sys/file.h" 103 #include "sys/proc.h" 104 #include "sys/user.h" 105 #include "i386/isa/wtreg.h" 106 107 #ifdef ORC 108 unsigned wtport = 0x288; /* base I/O port of controller */ 109 #else ORC 110 unsigned wtport = 0x300; /* base I/O port of controller */ 111 #endif ORC 112 /* standard = 0x300 */ 113 /* alternate = 0x338 */ 114 115 unsigned wtchan = 1; /* DMA channel number */ 116 /* stardard = 1 */ 117 /* hardware permits 1, 2 or 3. */ 118 /* (Avoid DMA 2: used by disks) */ 119 120 int first_wtopen_ever = 1; 121 122 123 #define ERROR 1 /* return from tape routines */ 124 #define SUCCESS 0 /* return from tape routines */ 125 126 int wci = 0; 127 int exflag = 0; 128 int bytes = 0; 129 130 static unsigned char eqdma = 0x8; 131 static unsigned char pagereg = 0x83; 132 static unsigned char dmareg = 2; 133 static unsigned char dma_write = 0x49; 134 static unsigned char dma_read = 0x45; 135 static unsigned char dma_done = 2; 136 static unsigned char mode = 0; 137 static unsigned char mbits; /* map bits into each other */ 138 static long bufptr; 139 static unsigned numbytes; 140 /* 141 _wci dw 0 ; interrupt chain finished normally 142 _exflag dw 0 ; exception variable 143 _bytes dw 0 ; current bytes 144 145 eqdma db 8h ; enable dma command: ch1,ch2=8h, ch3=10h 146 pagereg db 83h ; ch1=83h, ch2=81h, ch3=82h 147 dmareg db 2 ; ch1=2, ch2=4, ch3=6 148 dma_write db 49h ; write dma command: 48h+_wtchan 149 dma_read db 45h ; read dma command: 44h+_wtchan 150 dma_done db 2 ; dma done flag: 1<<_wtchan 151 mode db 0 ; dma operation mode 152 lbufptr dw 0 ; buffer pointer to data buffers, low word 153 hbufptr dw 0 ; buffer pointer to data buffers, high word 154 numbytes dw 0 ; number of bytes to read or write (new) 155 */ 156 157 #define PAGESIZ 4096 158 #define HZ 60 159 160 /* tape controller ports */ 161 #define STATPORT wtport 162 #define CTLPORT STATPORT 163 #define CMDPORT (wtport+1) 164 #define DATAPORT CMDPORT 165 166 /* defines for reading out status from wangtek tape controller */ 167 #define READY 0x01 /* ready bit define */ 168 #define EXCEP 0x02 /* exception bit define */ 169 #define STAT (READY|EXCEP) 170 #define RESETMASK 0x7 171 #define RESETVAL (RESETMASK & ~EXCEP) 172 173 /* tape controller control bits (CTLPORT) */ 174 #define ONLINE 0x01 175 #define RESET 0x02 176 #define REQUEST 0x04 /* request command */ 177 #define CMDOFF 0xC0 178 179 /* QIC-02 commands (CMDPORT) */ 180 #define RDDATA 0x80 /* read data */ 181 #define READFM 0xA0 /* read file mark */ 182 #define WRTDATA 0x40 /* write data */ 183 #define WRITEFM 0x60 /* write file mark */ 184 #define RDSTAT 0xC0 /* read status command */ 185 #define REWIND 0x21 /* rewind command (position+bot) */ 186 187 /* 8237 DMA controller regs */ 188 #define STATUSREG 0x8 189 #define MASKREG 0xA 190 #define MODEREG 0xB 191 #define CLEARFF 0xC 192 193 /* streamer tape block size */ 194 #define BLKSIZE 512 195 196 /* Tape characteristics */ 197 #define NBPS 512 /* 512-byte blocks */ 198 #define ERROR 1 /* return from tape routines */ 199 #define SUCCESS 0 /* return from tape routines */ 200 201 /* Minor devs */ 202 #define TP_REWCLOSE(d) ((minor(d)&04) == 0) /* Rewind tape on close if read/write */ 203 #define TP_DENS(dev) ((minor(dev) >> 3) & 03) /* set density */ 204 #define TPHOG(d) 0 /* use Hogproc during tape I/O */ 205 206 /* defines for wtflags */ 207 #define TPINUSE 0x0001 /* tape is already open */ 208 #define TPREAD 0x0002 /* tape is only open for reading */ 209 #define TPWRITE 0x0004 /* tape is only open for writing */ 210 #define TPSTART 0x0008 /* tape must be rewound and reset */ 211 #define TPDEAD 0x0010 /* tape drive does not work or driver error */ 212 #define TPSESS 0x0020 /* no more reads or writes allowed in session */ 213 /* for example, when tape has to be changed */ 214 #define TPSTOP 0x0040 /* Stop command outstanding */ 215 #define TPREW 0x0080 /* Rewind command outstanding, see wtdsl2() */ 216 #define TPVOL 0x0100 /* Read file mark, or hit end of tape */ 217 #define TPWO 0x0200 /* write command outstanding */ 218 #define TPRO 0x0400 /* read command outstanding */ 219 #define TPWANY 0x0800 /* write command requested */ 220 #define TPRANY 0x1000 /* read command requested */ 221 #define TPWP 0x2000 /* write protect error seen */ 222 223 unsigned int wtflags = TPSTART; /* state of tape drive */ 224 225 struct buf rwtbuf; /* header for raw i/o */ 226 struct proc *myproc; /* process which opened tape driver */ 227 228 char wtimeron; /* wtimer() active flag */ 229 char wtio; /* dma (i/o) active flag */ 230 char isrlock; /* isr() flag */ 231 232 struct proc * Hogproc; /* no Hogproc on Microport */ 233 #define ftoseg(x) ((unsigned) (x >> 16)) 234 235 struct wtstatus { 236 ushort wt_err; /* code for error encountered */ 237 ushort wt_ercnt; /* number of error blocks */ 238 ushort wt_urcnt; /* number of underruns */ 239 } wterror; 240 241 /* defines for wtstatus.wt_err */ 242 #define TP_POR 0x100 /* Power on/reset occurred */ 243 #define TP_RES1 0x200 /* Reserved for end of media */ 244 #define TP_RES2 0x400 /* Reserved for bus parity */ 245 #define TP_BOM 0x800 /* Beginning of media */ 246 #define TP_MBD 0x1000 /* Marginal block detected */ 247 #define TP_NDT 0x2000 /* No data detected */ 248 #define TP_ILL 0x4000 /* Illegal command */ 249 #define TP_ST1 0x8000 /* Status byte 1 bits */ 250 #define TP_FIL 0x01 /* File mark detected */ 251 #define TP_BNL 0x02 /* Bad block not located */ 252 #define TP_UDA 0x04 /* Unrecoverable data error */ 253 #define TP_EOM 0x08 /* End of media */ 254 #define TP_WRP 0x10 /* Write protected cartridge */ 255 #define TP_USL 0x20 /* Unselected drive */ 256 #define TP_CNI 0x40 /* Cartridge not in place */ 257 #define TP_ST0 0x80 /* Status byte 0 bits */ 258 259 /* Grounds for reporting I/O error to user */ 260 #define TP_ERR0 (TP_BNL|TP_UDA|TP_WRP|TP_CNI|TP_FIL|TP_EOM|TP_USL) 261 #define TP_ERR1 (TP_MBD|TP_NDT|TP_ILL) 262 /* TP_ILL should never happen! */ 263 /* 264 #define TP_ERR0 0x7f 265 #define TP_ERR1 0x7700 266 */ 267 268 /* defines for reading out status from wangtek tape controller */ 269 #define READY 0x01 /* ready bit define */ 270 #define EXCEP 0x02 /* exception bit define */ 271 272 /* sleep priority */ 273 #define WTPRI (PZERO+10) 274 275 char pagebuf[NBPS]; /* buffer of size NBPS */ 276 unsigned long pageaddr; /* physical addr of pagebuf */ 277 /* pageaddr is used with DMA controller */ 278 time_t Hogtime; /* lbolt when Hog timer started */ 279 extern time_t lbolt; 280 281 #define debug printf 282 283 /* 284 * Strategy routine. 285 * 286 * Arguments: 287 * Pointer to buffer structure 288 * Function: 289 * Start transfer. 290 * 291 * It would be nice to have this multiple-threaded. 292 * There is a version of dump from Berkeley that works with multiple processes 293 * trading off with disk & tape I/O. 294 */ 295 296 int 297 wtstrategy(bp) 298 register struct buf *bp; 299 { 300 unsigned ucnt1, ucnt2, finished; 301 unsigned long adr1, adr2; 302 int bad; 303 304 adr1 = kvtop(bp->b_un.b_addr); 305 #ifdef DEBUG 306 debug("bpaddr %x\n", adr1); 307 #endif 308 ucnt1 = bp->b_bcount % NBPG; 309 ucnt2 = 0; 310 adr2 = 0; 311 #ifdef DEBUG 312 debug("WTstart: adr1 %lx cnt %x\n", adr1, ucnt1); 313 #endif 314 /* 64K boundary? (XXX) */ 315 if (ftoseg(adr1) != ftoseg(adr1 + (unsigned) ucnt1 - 1)) 316 { 317 adr2 = (adr1 & 0xffff0000L) + 0x10000L; 318 ucnt2 = (adr1 + ucnt1) - adr2; 319 ucnt1 -= ucnt2; 320 } 321 /* page boundary? */ 322 if (trunc_page(adr1) != trunc_page(adr1 + (unsigned) ucnt1 - 1)) 323 { unsigned u; 324 u = NBPG - ((unsigned)bp->b_un.b_addr & (NBPG-1)); 325 adr2 = kvtop(bp->b_un.b_addr + u); 326 ucnt2 = ucnt1 - u; 327 ucnt1 = u; 328 } 329 /* at file marks and end of tape, we just return '0 bytes available' */ 330 if (wtflags & TPVOL) { 331 bp->b_resid = bp->b_bcount; 332 goto xit; 333 } 334 if ((Hogproc == (struct proc *) 0) && TPHOG(bp->b_dev)) 335 { 336 #ifdef DEBUG 337 printf("setting Hogproc\n"); 338 #endif 339 Hogtime = 0; 340 Hogproc = myproc; 341 } 342 if (bp->b_flags & B_READ) { 343 bad = 0; 344 345 /* For now, we assume that all data will be copied out */ 346 /* If read command outstanding, just skip down */ 347 if (!(wtflags & TPRO)) { 348 if (ERROR == wtsense(TP_WRP)) /* clear status */ 349 goto errxit; 350 #ifdef DEBUG 351 debug("WTread: Start read\n"); 352 #endif 353 if (!(wtflags & TPREAD) || (wtflags & TPWANY) || 354 (rstart() == ERROR)) { 355 #ifdef DEBUG 356 debug("Tpstart: read init error\n"); /* */ 357 #endif 358 goto errxit; 359 } 360 wtflags |= TPRO|TPRANY; 361 } 362 363 finished = 0; 364 /* Take a deep breath */ 365 if (ucnt1) { 366 if ((rtape(adr1, ucnt1) == ERROR) && 367 (wtsense(TP_WRP) == ERROR)) 368 goto endio; 369 /* wait for it */ 370 bad = pollrdy(); 371 finished = bytes; 372 if (bad) 373 goto endio; 374 } 375 /* if a second I/O region, start it */ 376 if (ucnt2) { 377 if ((rtape(adr2, ucnt2) == ERROR) && 378 (wtsense(TP_WRP) == ERROR)) 379 ucnt2 = 0; /* don't poll for me */ 380 } 381 382 /* if second i/o pending wait for it */ 383 if (ucnt2) { 384 pollrdy(); 385 /* whether pollrdy is ok or not */ 386 finished += bytes; 387 } 388 } else { 389 if (wtflags & TPWP) /* write protected */ 390 goto errxit; 391 392 /* If write command outstanding, just skip down */ 393 if (!(wtflags & TPWO)) { 394 if (ERROR == wtsense(0)) /* clear status */ 395 { 396 #ifdef DEBUG 397 debug("TPstart: sense 0\n"); 398 #endif 399 goto errxit; 400 } 401 if (!(wtflags & TPWRITE) || (wtflags & TPRANY) || 402 (wstart() == ERROR)) { 403 #ifdef DEBUG 404 debug("Tpstart: write init error\n"); /* */ 405 #endif 406 wtsense(0); 407 408 errxit: bp->b_flags |= B_ERROR; 409 bp->b_resid = bp->b_bcount; 410 goto xit; 411 } 412 wtflags |= TPWO|TPWANY; 413 } 414 415 /* and hold your nose */ 416 if (ucnt1 && ((wtape(adr1, ucnt1) == ERROR) 417 && (wtsense(0) == ERROR))) 418 finished = bytes; 419 420 else if (ucnt2 && 421 (((ucnt1 && pollrdy()) || 422 (wtape(adr2, ucnt2) == ERROR)) && 423 (wtsense(0) == ERROR))) 424 finished = ucnt1 + NBPS + bytes; 425 /* All writes and/or copyins were fine! */ 426 else 427 finished = bp->b_bcount; 428 bad = pollrdy(); 429 } 430 431 endio: 432 if(bad == EIO) bad = 0; 433 wterror.wt_err = 0; 434 if (exflag && wtsense((bp->b_flags & B_READ) ? TP_WRP : 0)) { 435 if ((wterror.wt_err & TP_ST0) 436 && (wterror.wt_err & (TP_FIL|TP_EOM))) { 437 #ifdef DEBUG 438 debug("WTsta: Hit end of tape\n"); /* */ 439 #endif 440 wtflags |= TPVOL; 441 if (wterror.wt_err & TP_FIL) { 442 if (wtflags & TPRO) 443 /* interrupter is bogus */ 444 rstart(); /* restart read command */ 445 else 446 wtflags &= ~TPWO; 447 finished += NBPS; 448 } 449 /* Reading file marks or writing end of tape return 0 bytes */ 450 } else { 451 bp->b_flags |= B_ERROR; 452 wtflags &= ~(TPWO|TPRO); 453 } 454 } 455 456 if(bad) { 457 bp->b_flags |= B_ERROR; 458 bp->b_error = bad; 459 } 460 bp->b_resid = bp->b_bcount - finished; 461 xit: 462 biodone(bp); 463 if (wtimeron) 464 Hogtime = lbolt; 465 else if (Hogproc == myproc) 466 Hogproc = (struct proc *) 0; 467 } 468 469 /* 470 * simulate an interrupt periodically while I/O is going 471 * this is necessary in case interrupts get eaten due to 472 * multiple devices on a single IRQ line 473 */ 474 wtimer() 475 { 476 /* If I/O going and not in isr(), simulate interrupt 477 * If no I/O for at least 1 second, stop being a Hog 478 * If I/O done and not a Hog, turn off wtimer() 479 */ 480 if (wtio && !isrlock) 481 isr(); 482 483 if ((Hogproc == myproc) && Hogtime && (lbolt-Hogtime > HZ)) 484 Hogproc = (struct proc *) 0; 485 486 if (wtio || (Hogproc == myproc)) 487 timeout(wtimer, (caddr_t) 0, HZ); 488 else 489 wtimeron = 0; 490 } 491 492 493 wtrawio(bp) 494 struct buf *bp; 495 { 496 wtstrategy(bp); 497 biowait(bp); 498 return(0); 499 } 500 501 /* 502 * ioctl routine 503 * for user level QIC commands only 504 */ 505 wtioctl(dev, cmd, arg, mode) 506 int dev, cmd; 507 unsigned long arg; 508 int mode; 509 { 510 if (cmd == WTQICMD) 511 { 512 if ((qicmd((int)arg) == ERROR) || (rdyexc(HZ) == ERROR)) 513 { 514 wtsense(0); 515 return(EIO); 516 } 517 return(0); 518 } 519 return(EINVAL); 520 } 521 522 /* 523 * open routine 524 * called on every device open 525 */ 526 wtopen(dev, flag) 527 int dev, flag; 528 { 529 if (first_wtopen_ever) { 530 wtinit(); 531 first_wtopen_ever = 0; 532 } 533 #ifdef DEBUG 534 printf("wtopen ...\n"); 535 #endif 536 if (!pageaddr) { 537 return(ENXIO); 538 } 539 if (wtflags & (TPINUSE)) { 540 return(ENXIO); 541 } 542 if (wtflags & (TPDEAD)) { 543 return(EIO); 544 } 545 /* If a rewind from the last session is going on, wait */ 546 while(wtflags & TPREW) { 547 #ifdef DEBUG 548 debug("Waiting for rew to finish\n"); 549 #endif 550 DELAY(1000000); /* delay one second */ 551 } 552 /* Only do reset and select when tape light is off, and tape is rewound. 553 * This allows multiple volumes. */ 554 if (wtflags & TPSTART) { 555 if (t_reset() != SUCCESS) { 556 return(ENXIO); 557 } 558 #ifdef DEBUG 559 debug("reset done. calling wtsense\n"); 560 #endif 561 if (wtsense(TP_WRP) == ERROR) { 562 return (EIO); 563 } 564 #ifdef DEBUG 565 debug("wtsense done\n"); 566 #endif 567 wtflags &= ~TPSTART; 568 } 569 570 wtflags = TPINUSE; 571 if (flag & FREAD) 572 wtflags |= TPREAD; 573 if (flag & FWRITE) 574 wtflags |= TPWRITE; 575 rwtbuf.b_flags = 0; 576 myproc = curproc; /* for comparison */ 577 #ifdef not 578 switch(TP_DENS(dev)) { 579 case 0: 580 cmds(0x28); 581 break; 582 case 1: 583 cmds(0x29); 584 break; 585 case 2: 586 cmds(0x27); 587 break; 588 case 3: 589 cmds(0x24); 590 } 591 #endif 592 return(0); 593 } 594 595 /* 596 * close routine 597 * called on last device close 598 * If not rewind-on-close, leave read or write command intact. 599 */ 600 wtclose(dev) 601 { 602 int wtdsl2(); 603 604 #ifdef DEBUG 605 debug("WTclose:\n"); 606 #endif 607 if (Hogproc == myproc) 608 Hogproc = (struct proc *) 0; 609 if (!exflag && (wtflags & TPWANY) && !(wtflags & (TPSESS|TPDEAD))) { 610 if (!(wtflags & TPWO)) 611 wstart(); 612 #ifdef DEBUG 613 debug("WT: Writing file mark\n"); 614 #endif 615 wmark(); /* write file mark */ 616 #ifdef DEBUG 617 debug("WT: Wrote file mark, going to wait\n"); 618 #endif 619 if (rdyexc(HZ/10) == ERROR) { 620 wtsense(0); 621 } 622 } 623 if (TP_REWCLOSE(dev) || (wtflags & (TPSESS|TPDEAD))) { 624 /* rewind tape to beginning of tape, deselect tape, and make a note */ 625 /* don't wait until rewind, though */ 626 /* Ending read or write causes rewind to happen, if no error, 627 * and READY and EXCEPTION stay up until it finishes */ 628 if (wtflags & (TPRO|TPWO)) 629 { 630 #ifdef DEBUG 631 debug("End read or write\n"); 632 #endif 633 rdyexc(HZ/10); 634 ioend(); 635 wtflags &= ~(TPRO|TPWO); 636 } 637 else wtwind(); 638 wtflags |= TPSTART | TPREW; 639 timeout(wtdsl2, 0, HZ); 640 } 641 else if (!(wtflags & (TPVOL|TPWANY))) 642 { 643 /* space forward to after next file mark no writing done */ 644 /* This allows skipping data without reading it.*/ 645 #ifdef DEBUG 646 debug("Reading past file mark\n"); 647 #endif 648 if (!(wtflags & TPRO)) 649 rstart(); 650 rmark(); 651 if (rdyexc(HZ/10)) 652 { 653 wtsense(TP_WRP); 654 } 655 } 656 wtflags &= TPREW|TPDEAD|TPSTART|TPRO|TPWO; 657 return(0); 658 } 659 660 /* return ERROR if user I/O request should receive an I/O error code */ 661 662 wtsense(ignor) 663 { 664 wtflags &= ~(TPRO|TPWO); 665 #ifdef DEBUGx 666 debug("WTsense: start "); 667 #endif 668 if (rdstatus(&wterror) == ERROR) 669 { 670 #ifdef DEBUG 671 debug("WTsense: Can't read status\n"); 672 #endif 673 return(ERROR); 674 } 675 #ifdef DEBUG 676 if (wterror.wt_err & (TP_ST0|TP_ST1)) 677 { 678 debug("Tperror: status %x error %d underruns %d\n", 679 wterror.wt_err, wterror.wt_ercnt, wterror.wt_urcnt); 680 } 681 else 682 debug("done. no error\n"); 683 #endif 684 wterror.wt_err &= ~ignor; /* ignore certain errors */ 685 reperr(wterror.wt_err); 686 if (((wterror.wt_err & TP_ST0) && (wterror.wt_err & TP_ERR0)) || 687 ((wterror.wt_err & TP_ST1) && (wterror.wt_err & TP_ERR1))) 688 return ERROR; 689 690 return SUCCESS; 691 } 692 693 /* lifted from tdriver.c from Wangtek */ 694 reperr(srb0) 695 int srb0; 696 { 697 int s0 = srb0 & (TP_ERR0|TP_ERR1); /* find out which exception to report */ 698 699 if (s0) { 700 if (s0 & TP_USL) 701 sterr("Drive not online"); 702 else if (s0 & TP_CNI) 703 sterr("No cartridge"); 704 else if ((s0 & TP_WRP) && !(wtflags & TPWP)) 705 { 706 sterr("Tape is write protected"); 707 wtflags |= TPWP; 708 } 709 /* 710 if (s0 & TP_FIL) 711 sterr("Filemark detected"); 712 */ 713 else if (s0 & TP_BNL) 714 sterr("Block in error not located"); 715 else if (s0 & TP_UDA) 716 sterr("Unrecoverable data error"); 717 /* 718 else if (s0 & TP_EOM) 719 sterr("End of tape"); 720 */ 721 else if (s0 & TP_NDT) 722 sterr("No data detected"); 723 /* 724 if (s0 & TP_POR) 725 sterr("Reset occured"); 726 */ 727 else if (s0 & TP_BOM) 728 sterr("Beginning of tape"); 729 else if (s0 & TP_ILL) 730 sterr("Illegal command"); 731 } 732 } 733 734 sterr(errstr) 735 char *errstr; 736 { 737 printf("Streamer: %s\n", errstr); 738 } 739 740 /* Wait until rewind finishes, and deselect drive */ 741 wtdsl2() { 742 int stat; 743 744 stat = inb(wtport) & (READY|EXCEP); 745 #ifdef DEBUG 746 debug("Timeout: Waiting for rewind to finish: stat %x\n", stat); 747 #endif 748 switch (stat) { 749 /* They're active low, ya'know */ 750 case READY|EXCEP: 751 timeout(wtdsl2, (caddr_t) 0, HZ); 752 return; 753 case EXCEP: 754 wtflags &= ~TPREW; 755 return; 756 case READY: 757 case 0: 758 wtflags &= ~TPREW; 759 sterr("Rewind failed"); 760 wtsense(TP_WRP); 761 return; 762 } 763 } 764 765 wtwind() { 766 #ifdef DEBUG 767 debug("WT: About to rewind\n"); 768 #endif 769 rwind(); /* actually start rewind */ 770 } 771 772 wtintr(unit) { 773 if (wtflags & (TPWO|TPRO)) 774 { 775 isrlock = 1; 776 if (wtio) isr(); 777 isrlock = 0; 778 } 779 } 780 781 wtinit() { 782 if (wtchan < 1 || wtchan > 3) 783 { 784 sterr("Bad DMA channel, cannot init driver"); 785 return; 786 } 787 wtlinit(); /* init assembly language variables */ 788 pageset(); 789 } 790 791 rdyexc(ticks) 792 { 793 int s; 794 #ifdef DEBUG 795 int os = 0xffff; /* force printout first time */ 796 #endif 797 for (;;) { /* loop until ready or exception */ 798 s=(inb(wtport) & 0xff); /* read the status register */ 799 #ifdef DEBUG 800 if (os != s) { 801 debug("Status reg = %x\n", s); /* */ 802 os = s; 803 } 804 #endif 805 if (!(s & EXCEP)) /* check if exception have occured */ 806 break; 807 if (!(s & READY)) /* check if controller is ready */ 808 break; 809 s = splbio(); 810 DELAY((ticks/HZ)*1000000); /* */ 811 splx(s); 812 } 813 #ifdef DEBUG 814 debug("Status reg = %x on return\n", s); /* */ 815 #endif 816 return((s & EXCEP)?SUCCESS:ERROR); /* return exception if it occured */ 817 } 818 819 pollrdy() 820 { 821 int sps; 822 #ifdef DEBUG 823 debug("Pollrdy\n"); 824 #endif 825 sps = splbio(); 826 while (wtio) { 827 int error; 828 829 if (error = tsleep((caddr_t)&wci, WTPRI | PCATCH, 830 "wtpoll", 0)) { 831 splx(sps); 832 return(error); 833 } 834 } 835 splx(sps); 836 #ifdef DEBUG 837 debug("Finish poll, wci %d exflag %d\n", wci, exflag); 838 #endif 839 return (EIO); 840 } 841 842 wtdma() /* start up i/o operation, called from dma() in wtlib1.s */ 843 { 844 wtio = 1; 845 if (!wtimeron) 846 { 847 wtimeron = 1; 848 timeout(wtimer, (caddr_t) 0, HZ/2); 849 } 850 } 851 852 wtwake() /* end i/o operation, called from isr() in wtlib1.s */ 853 { 854 wtio = 0; 855 wakeup(&wci); 856 } 857 858 pageset() 859 { 860 unsigned long pp; 861 862 pp = (unsigned long) pagebuf; 863 pageaddr = kvtop(pp); 864 #ifdef DEBUG 865 debug("pageset: addr %lx\n", pageaddr); 866 #endif 867 } 868 869 870 871 #define near 872 873 static near 874 sendcmd() 875 { 876 /* desired command in global mbits */ 877 878 outb(CTLPORT, mbits | REQUEST); /* set request */ 879 while (inb(STATPORT) & READY); /* wait for ready */ 880 outb(CTLPORT, mbits & ~REQUEST); /* reset request */ 881 while ((inb(STATPORT) & READY) == 0); /* wait for not ready */ 882 } 883 884 static near /* execute command */ 885 cmds(cmd) 886 { 887 register s; 888 889 do s = inb(STATPORT); 890 while ((s & STAT) == STAT); /* wait for ready */ 891 892 if ((s & EXCEP) == 0) /* if exception */ 893 return ERROR; /* error */ 894 895 outb(CMDPORT, cmd); /* output the command */ 896 897 outb(CTLPORT, mbits=ONLINE); /* set & send ONLINE */ 898 sendcmd(); 899 900 return SUCCESS; 901 } 902 903 qicmd(cmd) 904 { 905 return cmds(cmd); 906 } 907 908 rstart() 909 { 910 return cmds(RDDATA); 911 } 912 913 rmark() 914 { 915 return cmds(READFM); 916 } 917 918 wstart() 919 { 920 return cmds(WRTDATA); 921 } 922 923 ioend() 924 { 925 register s; 926 register rval = SUCCESS; 927 928 do s = inb(STATPORT); 929 while ((s & STAT) == STAT); /* wait for ready */ 930 931 if ((s & EXCEP) == 0) /* if exception */ 932 rval = ERROR; /* error */ 933 934 mbits &= ~ONLINE; 935 outb(CTLPORT, mbits); /* reset ONLINE */ 936 outb(MASKREG, wtchan+4); /* turn off dma */ 937 outb(CLEARFF, 0); /* reset direction flag */ 938 939 return rval; 940 } 941 942 wmark() 943 { 944 register s; 945 946 if (cmds(WRITEFM) == ERROR) 947 return ERROR; 948 949 do s = inb(STATPORT); 950 while ((s & STAT) == STAT); /* wait for ready */ 951 952 if ((s & EXCEP) == 0) /* if exception */ 953 return ERROR; /* error */ 954 955 return SUCCESS; 956 } 957 958 rwind() 959 { 960 register s; 961 962 mbits = CMDOFF; 963 964 do s = inb(STATPORT); 965 while ((s & STAT) == STAT); /* wait for ready */ 966 967 outb(CMDPORT, REWIND); 968 sendcmd(); 969 970 return SUCCESS; 971 } 972 973 rdstatus(stp) 974 char *stp; /* pointer to 6 byte buffer */ 975 { 976 register s; 977 int n; 978 979 do s = inb(STATPORT); 980 while ((s & STAT) == STAT); /* wait for ready or exception */ 981 982 outb(CMDPORT, RDSTAT); 983 sendcmd(); /* send read status command */ 984 985 for (n=0; n<6; n++) 986 { 987 #ifdef DEBUGx 988 debug("rdstatus: waiting, byte %d\n", n); 989 #endif 990 do s = inb(STATPORT); 991 while ((s & STAT) == STAT); /* wait for ready */ 992 #ifdef DEBUGx 993 debug("rdstatus: done\n"); 994 #endif 995 if ((s & EXCEP) == 0) /* if exception */ 996 return ERROR; /* error */ 997 998 *stp++ = inb(DATAPORT); /* read status byte */ 999 1000 outb(CTLPORT, mbits | REQUEST); /* set request */ 1001 #ifdef DEBUGx 1002 debug("rdstatus: waiting after request, byte %d\n", n); 1003 #endif 1004 while ((inb(STATPORT)&READY) == 0); /* wait for not ready */ 1005 for (s=100; s>0; s--); /* wait an additional time */ 1006 1007 outb(CTLPORT, mbits & ~REQUEST);/* unset request */ 1008 #ifdef DEBUGx 1009 debug("rdstatus: done\n"); 1010 #endif 1011 } 1012 return SUCCESS; 1013 } 1014 1015 t_reset() 1016 { 1017 register i; 1018 mbits |= RESET; 1019 outb(CTLPORT, mbits); /* send reset */ 1020 DELAY(20); 1021 mbits &= ~RESET; 1022 outb(CTLPORT, mbits); /* turn off reset */ 1023 if ((inb(STATPORT) & RESETMASK) == RESETVAL) 1024 return SUCCESS; 1025 return ERROR; 1026 } 1027 1028 static 1029 dma() 1030 { 1031 int x=splbio(); 1032 wtdma(); 1033 outb(CLEARFF, 0); 1034 outb(MODEREG, mode); /* set dma mode */ 1035 outb(dmareg, bufptr & 0xFF); 1036 outb(dmareg, (bufptr>>8) & 0xFF); 1037 outb(pagereg, (bufptr>>16) & 0xFF); 1038 outb(dmareg+1, (BLKSIZE-1) & 0xFF); 1039 outb(dmareg+1, (BLKSIZE-1) >> 8); 1040 outb(wtport, eqdma+ONLINE); 1041 outb(MASKREG, wtchan); /* enable command to 8237, start dma */ 1042 splx(x); 1043 } 1044 1045 static near 1046 wtstart(buf, cnt) 1047 long buf; 1048 int cnt; 1049 { 1050 register s; 1051 1052 bufptr = buf; /* init statics */ 1053 numbytes = cnt; 1054 wci = 0; /* init flags */ 1055 exflag = 0; 1056 bytes = 0; /* init counter */ 1057 1058 do s = inb(STATPORT) & STAT; 1059 while (s == STAT); /* wait for ready or error */ 1060 1061 if (s & EXCEP) /* no error */ 1062 { 1063 dma(); 1064 return SUCCESS; 1065 } 1066 return ERROR; /* error */ 1067 } 1068 1069 rtape(buf, cnt) 1070 long buf; /* physical address */ 1071 int cnt; /* number of bytes */ 1072 { 1073 mode = dma_read; 1074 return wtstart(buf,cnt); 1075 } 1076 1077 wtape(buf, cnt) 1078 long buf; /* physical address */ 1079 int cnt; /* number of bytes */ 1080 { 1081 mode = dma_write; 1082 return wtstart(buf,cnt); 1083 } 1084 1085 isr() 1086 { 1087 int stat = inb(wtport); 1088 if (!(stat & EXCEP)) /* exception during I/O */ 1089 { 1090 if (bytes + BLKSIZE >= numbytes) wci = 1; 1091 exflag = 1; 1092 goto isrwake; 1093 } 1094 if ((stat & READY) || !(inb(STATUSREG) & dma_done)) 1095 return; 1096 exflag = 0; 1097 outb(wtport, ONLINE); 1098 bytes += BLKSIZE; 1099 if (bytes >= numbytes) /* normal completion of I/O */ 1100 { 1101 wci = 1; 1102 isrwake: 1103 outb(MASKREG, 4+wtchan); /* turn off dma */ 1104 wtwake(); /* wake up user level */ 1105 } 1106 else 1107 { /* continue I/O */ 1108 bufptr += BLKSIZE; 1109 dma(); 1110 } 1111 } 1112 1113 wtlinit() 1114 { 1115 switch (wtchan) { 1116 case 1: 1117 return; 1118 case 2: 1119 pagereg = 0x81; 1120 dma_done = 4; 1121 break; 1122 case 3: 1123 eqdma = 0x10; 1124 pagereg = 0x82; 1125 dma_done = 8; 1126 break; 1127 } 1128 dma_write = wtchan+0x48; 1129 dma_read = wtchan+0x44; 1130 dmareg = wtchan+wtchan; 1131 } 1132 1133 wtsize() 1134 { 1135 } 1136 1137 wtdump() 1138 { 1139 } 1140 1141 #include "i386/isa/isa_device.h" 1142 #include "i386/isa/icu.h" 1143 1144 int wtprobe(), wtattach(); 1145 struct isa_driver wtdriver = { 1146 wtprobe, wtattach, "wt", 1147 }; 1148 1149 wtprobe(dvp) 1150 struct isa_device *dvp; 1151 { 1152 int val,i,s; 1153 1154 #ifdef lint 1155 wtintr(0); 1156 #endif 1157 1158 wtport = dvp->id_iobase; 1159 if(t_reset() != SUCCESS) return(0); 1160 return(1); 1161 } 1162 1163 wtattach() { } 1164 1165 #endif NWT 1166
Indexes created Wed Sep 24 15:09:51 GMT 2025