wt.c revision 1.4
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 1.4 1993/07/19 16:58:20 cgd 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 * (Mach) HISTORY 69 * Revision 2.2.1.3 90/01/08 13:29:38 rvb 70 * Add Intel copyright. 71 * [90/01/08 rvb] 72 * 73 * Revision 2.2.1.2 89/12/21 18:00:09 rvb 74 * Change WTPRI to make the streamer tape read/write 75 * interruptible. [lin] 76 * 77 * Revision 2.2.1.1 89/11/10 09:49:49 rvb 78 * ORC likes their streamer port at 0x288. 79 * [89/11/08 rvb] 80 * 81 * Revision 2.2 89/09/25 12:33:02 rvb 82 * Driver was provided by Intel 9/18/89. 83 * [89/09/23 rvb] 84 * 85 */ 86 87 /* 88 * 89 * Copyright 1988, 1989 by Intel Corporation 90 * 91 * Support Bell Tech QIC-02 and WANGTEK QIC-36 or QIC-02 92 */ 93 94 /*#include <sys/errno.h> 95 #include <sys/signal.h> 96 #include <sys/types.h>*/ 97 #include "sys/param.h" 98 #include "sys/buf.h" 99 #include "sys/file.h" 100 #include "sys/proc.h" 101 #include "sys/user.h" 102 #include "i386/isa/wtreg.h" 103 104 #ifdef ORC 105 unsigned wtport = 0x288; /* base I/O port of controller */ 106 #else ORC 107 unsigned wtport = 0x300; /* base I/O port of controller */ 108 #endif ORC 109 /* standard = 0x300 */ 110 /* alternate = 0x338 */ 111 112 unsigned wtchan = 1; /* DMA channel number */ 113 /* stardard = 1 */ 114 /* hardware permits 1, 2 or 3. */ 115 /* (Avoid DMA 2: used by disks) */ 116 117 int first_wtopen_ever = 1; 118 119 120 #define ERROR 1 /* return from tape routines */ 121 #define SUCCESS 0 /* return from tape routines */ 122 123 int wci = 0; 124 int exflag = 0; 125 int bytes = 0; 126 127 static unsigned char eqdma = 0x8; 128 static unsigned char pagereg = 0x83; 129 static unsigned char dmareg = 2; 130 static unsigned char dma_write = 0x49; 131 static unsigned char dma_read = 0x45; 132 static unsigned char dma_done = 2; 133 static unsigned char mode = 0; 134 static unsigned char mbits; /* map bits into each other */ 135 static long bufptr; 136 static unsigned numbytes; 137 /* 138 _wci dw 0 ; interrupt chain finished normally 139 _exflag dw 0 ; exception variable 140 _bytes dw 0 ; current bytes 141 142 eqdma db 8h ; enable dma command: ch1,ch2=8h, ch3=10h 143 pagereg db 83h ; ch1=83h, ch2=81h, ch3=82h 144 dmareg db 2 ; ch1=2, ch2=4, ch3=6 145 dma_write db 49h ; write dma command: 48h+_wtchan 146 dma_read db 45h ; read dma command: 44h+_wtchan 147 dma_done db 2 ; dma done flag: 1<<_wtchan 148 mode db 0 ; dma operation mode 149 lbufptr dw 0 ; buffer pointer to data buffers, low word 150 hbufptr dw 0 ; buffer pointer to data buffers, high word 151 numbytes dw 0 ; number of bytes to read or write (new) 152 */ 153 154 #define PAGESIZ 4096 155 #define HZ 60 156 157 /* tape controller ports */ 158 #define STATPORT wtport 159 #define CTLPORT STATPORT 160 #define CMDPORT (wtport+1) 161 #define DATAPORT CMDPORT 162 163 /* defines for reading out status from wangtek tape controller */ 164 #define READY 0x01 /* ready bit define */ 165 #define EXCEP 0x02 /* exception bit define */ 166 #define STAT (READY|EXCEP) 167 #define RESETMASK 0x7 168 #define RESETVAL (RESETMASK & ~EXCEP) 169 170 /* tape controller control bits (CTLPORT) */ 171 #define ONLINE 0x01 172 #define RESET 0x02 173 #define REQUEST 0x04 /* request command */ 174 #define CMDOFF 0xC0 175 176 /* QIC-02 commands (CMDPORT) */ 177 #define RDDATA 0x80 /* read data */ 178 #define READFM 0xA0 /* read file mark */ 179 #define WRTDATA 0x40 /* write data */ 180 #define WRITEFM 0x60 /* write file mark */ 181 #define RDSTAT 0xC0 /* read status command */ 182 #define REWIND 0x21 /* rewind command (position+bot) */ 183 184 /* 8237 DMA controller regs */ 185 #define STATUSREG 0x8 186 #define MASKREG 0xA 187 #define MODEREG 0xB 188 #define CLEARFF 0xC 189 190 /* streamer tape block size */ 191 #define BLKSIZE 512 192 193 /* Tape characteristics */ 194 #define NBPS 512 /* 512-byte blocks */ 195 #define ERROR 1 /* return from tape routines */ 196 #define SUCCESS 0 /* return from tape routines */ 197 198 /* Minor devs */ 199 #define TP_REWCLOSE(d) ((minor(d)&04) == 0) /* Rewind tape on close if read/write */ 200 #define TP_DENS(dev) ((minor(dev) >> 3) & 03) /* set density */ 201 #define TPHOG(d) 0 /* use Hogproc during tape I/O */ 202 203 /* defines for wtflags */ 204 #define TPINUSE 0x0001 /* tape is already open */ 205 #define TPREAD 0x0002 /* tape is only open for reading */ 206 #define TPWRITE 0x0004 /* tape is only open for writing */ 207 #define TPSTART 0x0008 /* tape must be rewound and reset */ 208 #define TPDEAD 0x0010 /* tape drive does not work or driver error */ 209 #define TPSESS 0x0020 /* no more reads or writes allowed in session */ 210 /* for example, when tape has to be changed */ 211 #define TPSTOP 0x0040 /* Stop command outstanding */ 212 #define TPREW 0x0080 /* Rewind command outstanding, see wtdsl2() */ 213 #define TPVOL 0x0100 /* Read file mark, or hit end of tape */ 214 #define TPWO 0x0200 /* write command outstanding */ 215 #define TPRO 0x0400 /* read command outstanding */ 216 #define TPWANY 0x0800 /* write command requested */ 217 #define TPRANY 0x1000 /* read command requested */ 218 #define TPWP 0x2000 /* write protect error seen */ 219 220 unsigned int wtflags = TPSTART; /* state of tape drive */ 221 222 struct buf rwtbuf; /* header for raw i/o */ 223 struct proc *myproc; /* process which opened tape driver */ 224 225 char wtimeron; /* wtimer() active flag */ 226 char wtio; /* dma (i/o) active flag */ 227 char isrlock; /* isr() flag */ 228 229 struct proc * Hogproc; /* no Hogproc on Microport */ 230 #define ftoseg(x) ((unsigned) (x >> 16)) 231 232 struct wtstatus { 233 ushort wt_err; /* code for error encountered */ 234 ushort wt_ercnt; /* number of error blocks */ 235 ushort wt_urcnt; /* number of underruns */ 236 } wterror; 237 238 /* defines for wtstatus.wt_err */ 239 #define TP_POR 0x100 /* Power on/reset occurred */ 240 #define TP_RES1 0x200 /* Reserved for end of media */ 241 #define TP_RES2 0x400 /* Reserved for bus parity */ 242 #define TP_BOM 0x800 /* Beginning of media */ 243 #define TP_MBD 0x1000 /* Marginal block detected */ 244 #define TP_NDT 0x2000 /* No data detected */ 245 #define TP_ILL 0x4000 /* Illegal command */ 246 #define TP_ST1 0x8000 /* Status byte 1 bits */ 247 #define TP_FIL 0x01 /* File mark detected */ 248 #define TP_BNL 0x02 /* Bad block not located */ 249 #define TP_UDA 0x04 /* Unrecoverable data error */ 250 #define TP_EOM 0x08 /* End of media */ 251 #define TP_WRP 0x10 /* Write protected cartridge */ 252 #define TP_USL 0x20 /* Unselected drive */ 253 #define TP_CNI 0x40 /* Cartridge not in place */ 254 #define TP_ST0 0x80 /* Status byte 0 bits */ 255 256 /* Grounds for reporting I/O error to user */ 257 #define TP_ERR0 (TP_BNL|TP_UDA|TP_WRP|TP_CNI|TP_FIL|TP_EOM|TP_USL) 258 #define TP_ERR1 (TP_MBD|TP_NDT|TP_ILL) 259 /* TP_ILL should never happen! */ 260 /* 261 #define TP_ERR0 0x7f 262 #define TP_ERR1 0x7700 263 */ 264 265 /* defines for reading out status from wangtek tape controller */ 266 #define READY 0x01 /* ready bit define */ 267 #define EXCEP 0x02 /* exception bit define */ 268 269 /* sleep priority */ 270 #define WTPRI (PZERO+10) 271 272 char pagebuf[NBPS]; /* buffer of size NBPS */ 273 unsigned long pageaddr; /* physical addr of pagebuf */ 274 /* pageaddr is used with DMA controller */ 275 time_t Hogtime; /* lbolt when Hog timer started */ 276 extern time_t lbolt; 277 278 #define debug printf 279 280 /* 281 * Strategy routine. 282 * 283 * Arguments: 284 * Pointer to buffer structure 285 * Function: 286 * Start transfer. 287 * 288 * It would be nice to have this multiple-threaded. 289 * There is a version of dump from Berkeley that works with multiple processes 290 * trading off with disk & tape I/O. 291 */ 292 293 int 294 wtstrategy(bp) 295 register struct buf *bp; 296 { 297 unsigned ucnt1, ucnt2, finished; 298 unsigned long adr1, adr2; 299 int bad; 300 301 adr1 = kvtop(bp->b_un.b_addr); 302 #ifdef DEBUG 303 debug("bpaddr %x\n", adr1); 304 #endif 305 ucnt1 = bp->b_bcount % NBPG; 306 ucnt2 = 0; 307 adr2 = 0; 308 #ifdef DEBUG 309 debug("WTstart: adr1 %lx cnt %x\n", adr1, ucnt1); 310 #endif 311 /* 64K boundary? (XXX) */ 312 if (ftoseg(adr1) != ftoseg(adr1 + (unsigned) ucnt1 - 1)) 313 { 314 adr2 = (adr1 & 0xffff0000L) + 0x10000L; 315 ucnt2 = (adr1 + ucnt1) - adr2; 316 ucnt1 -= ucnt2; 317 } 318 /* page boundary? */ 319 if (trunc_page(adr1) != trunc_page(adr1 + (unsigned) ucnt1 - 1)) 320 { unsigned u; 321 u = NBPG - ((unsigned)bp->b_un.b_addr & (NBPG-1)); 322 adr2 = kvtop(bp->b_un.b_addr + u); 323 ucnt2 = ucnt1 - u; 324 ucnt1 = u; 325 } 326 /* at file marks and end of tape, we just return '0 bytes available' */ 327 if (wtflags & TPVOL) { 328 bp->b_resid = bp->b_bcount; 329 goto xit; 330 } 331 if ((Hogproc == (struct proc *) 0) && TPHOG(bp->b_dev)) 332 { 333 #ifdef DEBUG 334 printf("setting Hogproc\n"); 335 #endif 336 Hogtime = 0; 337 Hogproc = myproc; 338 } 339 if (bp->b_flags & B_READ) { 340 bad = 0; 341 342 /* For now, we assume that all data will be copied out */ 343 /* If read command outstanding, just skip down */ 344 if (!(wtflags & TPRO)) { 345 if (ERROR == wtsense(TP_WRP)) /* clear status */ 346 goto errxit; 347 #ifdef DEBUG 348 debug("WTread: Start read\n"); 349 #endif 350 if (!(wtflags & TPREAD) || (wtflags & TPWANY) || 351 (rstart() == ERROR)) { 352 #ifdef DEBUG 353 debug("Tpstart: read init error\n"); /* */ 354 #endif 355 goto errxit; 356 } 357 wtflags |= TPRO|TPRANY; 358 } 359 360 finished = 0; 361 /* Take a deep breath */ 362 if (ucnt1) { 363 if ((rtape(adr1, ucnt1) == ERROR) && 364 (wtsense(TP_WRP) == ERROR)) 365 goto endio; 366 /* wait for it */ 367 bad = pollrdy(); 368 finished = bytes; 369 if (bad) 370 goto endio; 371 } 372 /* if a second I/O region, start it */ 373 if (ucnt2) { 374 if ((rtape(adr2, ucnt2) == ERROR) && 375 (wtsense(TP_WRP) == ERROR)) 376 ucnt2 = 0; /* don't poll for me */ 377 } 378 379 /* if second i/o pending wait for it */ 380 if (ucnt2) { 381 pollrdy(); 382 /* whether pollrdy is ok or not */ 383 finished += bytes; 384 } 385 } else { 386 if (wtflags & TPWP) /* write protected */ 387 goto errxit; 388 389 /* If write command outstanding, just skip down */ 390 if (!(wtflags & TPWO)) { 391 if (ERROR == wtsense(0)) /* clear status */ 392 { 393 #ifdef DEBUG 394 debug("TPstart: sense 0\n"); 395 #endif 396 goto errxit; 397 } 398 if (!(wtflags & TPWRITE) || (wtflags & TPRANY) || 399 (wstart() == ERROR)) { 400 #ifdef DEBUG 401 debug("Tpstart: write init error\n"); /* */ 402 #endif 403 wtsense(0); 404 405 errxit: bp->b_flags |= B_ERROR; 406 bp->b_resid = bp->b_bcount; 407 goto xit; 408 } 409 wtflags |= TPWO|TPWANY; 410 } 411 412 /* and hold your nose */ 413 if (ucnt1 && ((wtape(adr1, ucnt1) == ERROR) 414 && (wtsense(0) == ERROR))) 415 finished = bytes; 416 417 else if (ucnt2 && 418 (((ucnt1 && pollrdy()) || 419 (wtape(adr2, ucnt2) == ERROR)) && 420 (wtsense(0) == ERROR))) 421 finished = ucnt1 + NBPS + bytes; 422 /* All writes and/or copyins were fine! */ 423 else 424 finished = bp->b_bcount; 425 bad = pollrdy(); 426 } 427 428 endio: 429 if(bad == EIO) bad = 0; 430 wterror.wt_err = 0; 431 if (exflag && wtsense((bp->b_flags & B_READ) ? TP_WRP : 0)) { 432 if ((wterror.wt_err & TP_ST0) 433 && (wterror.wt_err & (TP_FIL|TP_EOM))) { 434 #ifdef DEBUG 435 debug("WTsta: Hit end of tape\n"); /* */ 436 #endif 437 wtflags |= TPVOL; 438 if (wterror.wt_err & TP_FIL) { 439 if (wtflags & TPRO) 440 /* interrupter is bogus */ 441 rstart(); /* restart read command */ 442 else 443 wtflags &= ~TPWO; 444 finished += NBPS; 445 } 446 /* Reading file marks or writing end of tape return 0 bytes */ 447 } else { 448 /* XXX (cgd) - for broken 386bsd physio only: 449 * bp->b_flags |= B_ERROR; 450 */ 451 wtflags &= ~(TPWO|TPRO); 452 } 453 } 454 455 if(bad) { 456 bp->b_flags |= B_ERROR; 457 bp->b_error = bad; 458 } 459 bp->b_resid = bp->b_bcount - finished; 460 xit: 461 biodone(bp); 462 if (wtimeron) 463 Hogtime = lbolt; 464 else if (Hogproc == myproc) 465 Hogproc = (struct proc *) 0; 466 } 467 468 /* 469 * simulate an interrupt periodically while I/O is going 470 * this is necessary in case interrupts get eaten due to 471 * multiple devices on a single IRQ line 472 */ 473 wtimer() 474 { 475 /* If I/O going and not in isr(), simulate interrupt 476 * If no I/O for at least 1 second, stop being a Hog 477 * If I/O done and not a Hog, turn off wtimer() 478 */ 479 if (wtio && !isrlock) 480 isr(); 481 482 if ((Hogproc == myproc) && Hogtime && (lbolt-Hogtime > HZ)) 483 Hogproc = (struct proc *) 0; 484 485 if (wtio || (Hogproc == myproc)) 486 timeout(wtimer, (caddr_t) 0, HZ); 487 else 488 wtimeron = 0; 489 } 490 491 492 wtrawio(bp) 493 struct buf *bp; 494 { 495 wtstrategy(bp); 496 biowait(bp); 497 return(0); 498 } 499 500 /* 501 * ioctl routine 502 * for user level QIC commands only 503 */ 504 wtioctl(dev, cmd, arg, mode) 505 int dev, cmd; 506 unsigned long arg; 507 int mode; 508 { 509 if (cmd == WTQICMD) 510 { 511 if ((qicmd((int)arg) == ERROR) || (rdyexc(HZ) == ERROR)) 512 { 513 wtsense(0); 514 return(EIO); 515 } 516 return(0); 517 } 518 return(EINVAL); 519 } 520 521 /* 522 * open routine 523 * called on every device open 524 */ 525 wtopen(dev, flag) 526 int dev, flag; 527 { 528 if (first_wtopen_ever) { 529 wtinit(); 530 first_wtopen_ever = 0; 531 } 532 #ifdef DEBUG 533 printf("wtopen ...\n"); 534 #endif 535 if (!pageaddr) { 536 return(ENXIO); 537 } 538 if (wtflags & (TPINUSE)) { 539 return(ENXIO); 540 } 541 if (wtflags & (TPDEAD)) { 542 return(EIO); 543 } 544 /* If a rewind from the last session is going on, wait */ 545 while(wtflags & TPREW) { 546 #ifdef DEBUG 547 debug("Waiting for rew to finish\n"); 548 #endif 549 DELAY(1000000); /* delay one second */ 550 } 551 /* Only do reset and select when tape light is off, and tape is rewound. 552 * This allows multiple volumes. */ 553 if (wtflags & TPSTART) { 554 if (t_reset() != SUCCESS) { 555 return(ENXIO); 556 } 557 #ifdef DEBUG 558 debug("reset done. calling wtsense\n"); 559 #endif 560 if (wtsense(TP_WRP) == ERROR) { 561 return (EIO); 562 } 563 #ifdef DEBUG 564 debug("wtsense done\n"); 565 #endif 566 wtflags &= ~TPSTART; 567 } 568 569 wtflags = TPINUSE; 570 if (flag & FREAD) 571 wtflags |= TPREAD; 572 if (flag & FWRITE) 573 wtflags |= TPWRITE; 574 rwtbuf.b_flags = 0; 575 myproc = curproc; /* for comparison */ 576 #ifdef not 577 switch(TP_DENS(dev)) { 578 case 0: 579 cmds(0x28); 580 break; 581 case 1: 582 cmds(0x29); 583 break; 584 case 2: 585 cmds(0x27); 586 break; 587 case 3: 588 cmds(0x24); 589 } 590 #endif 591 return(0); 592 } 593 594 /* 595 * close routine 596 * called on last device close 597 * If not rewind-on-close, leave read or write command intact. 598 */ 599 wtclose(dev) 600 { 601 int wtdsl2(); 602 603 #ifdef DEBUG 604 debug("WTclose:\n"); 605 #endif 606 if (Hogproc == myproc) 607 Hogproc = (struct proc *) 0; 608 if (!exflag && (wtflags & TPWANY) && !(wtflags & (TPSESS|TPDEAD))) { 609 if (!(wtflags & TPWO)) 610 wstart(); 611 #ifdef DEBUG 612 debug("WT: Writing file mark\n"); 613 #endif 614 wmark(); /* write file mark */ 615 #ifdef DEBUG 616 debug("WT: Wrote file mark, going to wait\n"); 617 #endif 618 if (rdyexc(HZ/10) == ERROR) { 619 wtsense(0); 620 } 621 } 622 if (TP_REWCLOSE(dev) || (wtflags & (TPSESS|TPDEAD))) { 623 /* rewind tape to beginning of tape, deselect tape, and make a note */ 624 /* don't wait until rewind, though */ 625 /* Ending read or write causes rewind to happen, if no error, 626 * and READY and EXCEPTION stay up until it finishes */ 627 if (wtflags & (TPRO|TPWO)) 628 { 629 #ifdef DEBUG 630 debug("End read or write\n"); 631 #endif 632 rdyexc(HZ/10); 633 ioend(); 634 wtflags &= ~(TPRO|TPWO); 635 } 636 else wtwind(); 637 wtflags |= TPSTART | TPREW; 638 timeout(wtdsl2, 0, HZ); 639 } 640 else if (!(wtflags & (TPVOL|TPWANY))) 641 { 642 /* space forward to after next file mark no writing done */ 643 /* This allows skipping data without reading it.*/ 644 #ifdef DEBUG 645 debug("Reading past file mark\n"); 646 #endif 647 if (!(wtflags & TPRO)) 648 rstart(); 649 rmark(); 650 if (rdyexc(HZ/10)) 651 { 652 wtsense(TP_WRP); 653 } 654 } 655 wtflags &= TPREW|TPDEAD|TPSTART|TPRO|TPWO; 656 return(0); 657 } 658 659 /* return ERROR if user I/O request should receive an I/O error code */ 660 661 wtsense(ignor) 662 { 663 wtflags &= ~(TPRO|TPWO); 664 #ifdef DEBUGx 665 debug("WTsense: start "); 666 #endif 667 if (rdstatus(&wterror) == ERROR) 668 { 669 #ifdef DEBUG 670 debug("WTsense: Can't read status\n"); 671 #endif 672 return(ERROR); 673 } 674 #ifdef DEBUG 675 if (wterror.wt_err & (TP_ST0|TP_ST1)) 676 { 677 debug("Tperror: status %x error %d underruns %d\n", 678 wterror.wt_err, wterror.wt_ercnt, wterror.wt_urcnt); 679 } 680 else 681 debug("done. no error\n"); 682 #endif 683 wterror.wt_err &= ~ignor; /* ignore certain errors */ 684 reperr(wterror.wt_err); 685 if (((wterror.wt_err & TP_ST0) && (wterror.wt_err & TP_ERR0)) || 686 ((wterror.wt_err & TP_ST1) && (wterror.wt_err & TP_ERR1))) 687 return ERROR; 688 689 return SUCCESS; 690 } 691 692 /* lifted from tdriver.c from Wangtek */ 693 reperr(srb0) 694 int srb0; 695 { 696 int s0 = srb0 & (TP_ERR0|TP_ERR1); /* find out which exception to report */ 697 698 if (s0) { 699 if (s0 & TP_USL) 700 sterr("Drive not online"); 701 else if (s0 & TP_CNI) 702 sterr("No cartridge"); 703 else if ((s0 & TP_WRP) && !(wtflags & TPWP)) 704 { 705 sterr("Tape is write protected"); 706 wtflags |= TPWP; 707 } 708 /* 709 if (s0 & TP_FIL) 710 sterr("Filemark detected"); 711 */ 712 else if (s0 & TP_BNL) 713 sterr("Block in error not located"); 714 else if (s0 & TP_UDA) 715 sterr("Unrecoverable data error"); 716 /* 717 else if (s0 & TP_EOM) 718 sterr("End of tape"); 719 */ 720 else if (s0 & TP_NDT) 721 sterr("No data detected"); 722 /* 723 if (s0 & TP_POR) 724 sterr("Reset occured"); 725 */ 726 else if (s0 & TP_BOM) 727 sterr("Beginning of tape"); 728 else if (s0 & TP_ILL) 729 sterr("Illegal command"); 730 } 731 } 732 733 sterr(errstr) 734 char *errstr; 735 { 736 printf("Streamer: %s\n", errstr); 737 } 738 739 /* Wait until rewind finishes, and deselect drive */ 740 wtdsl2() { 741 int stat; 742 743 stat = inb(wtport) & (READY|EXCEP); 744 #ifdef DEBUG 745 debug("Timeout: Waiting for rewind to finish: stat %x\n", stat); 746 #endif 747 switch (stat) { 748 /* They're active low, ya'know */ 749 case READY|EXCEP: 750 timeout(wtdsl2, (caddr_t) 0, HZ); 751 return; 752 case EXCEP: 753 wtflags &= ~TPREW; 754 return; 755 case READY: 756 case 0: 757 wtflags &= ~TPREW; 758 sterr("Rewind failed"); 759 wtsense(TP_WRP); 760 return; 761 } 762 } 763 764 wtwind() { 765 #ifdef DEBUG 766 debug("WT: About to rewind\n"); 767 #endif 768 rwind(); /* actually start rewind */ 769 } 770 771 wtintr(unit) { 772 if (wtflags & (TPWO|TPRO)) 773 { 774 isrlock = 1; 775 if (wtio) isr(); 776 isrlock = 0; 777 } 778 } 779 780 wtinit() { 781 if (wtchan < 1 || wtchan > 3) 782 { 783 sterr("Bad DMA channel, cannot init driver"); 784 return; 785 } 786 wtlinit(); /* init assembly language variables */ 787 pageset(); 788 } 789 790 rdyexc(ticks) 791 { 792 int s; 793 #ifdef DEBUG 794 int os = 0xffff; /* force printout first time */ 795 #endif 796 for (;;) { /* loop until ready or exception */ 797 s=(inb(wtport) & 0xff); /* read the status register */ 798 #ifdef DEBUG 799 if (os != s) { 800 debug("Status reg = %x\n", s); /* */ 801 os = s; 802 } 803 #endif 804 if (!(s & EXCEP)) /* check if exception have occured */ 805 break; 806 if (!(s & READY)) /* check if controller is ready */ 807 break; 808 s = splbio(); 809 DELAY((ticks/HZ)*1000000); /* */ 810 splx(s); 811 } 812 #ifdef DEBUG 813 debug("Status reg = %x on return\n", s); /* */ 814 #endif 815 return((s & EXCEP)?SUCCESS:ERROR); /* return exception if it occured */ 816 } 817 818 pollrdy() 819 { 820 int sps; 821 #ifdef DEBUG 822 debug("Pollrdy\n"); 823 #endif 824 sps = splbio(); 825 while (wtio) { 826 int error; 827 828 if (error = tsleep((caddr_t)&wci, WTPRI | PCATCH, 829 "wtpoll", 0)) { 830 splx(sps); 831 return(error); 832 } 833 } 834 splx(sps); 835 #ifdef DEBUG 836 debug("Finish poll, wci %d exflag %d\n", wci, exflag); 837 #endif 838 return (EIO); 839 } 840 841 wtdma() /* start up i/o operation, called from dma() in wtlib1.s */ 842 { 843 wtio = 1; 844 if (!wtimeron) 845 { 846 wtimeron = 1; 847 timeout(wtimer, (caddr_t) 0, HZ/2); 848 } 849 } 850 851 wtwake() /* end i/o operation, called from isr() in wtlib1.s */ 852 { 853 wtio = 0; 854 wakeup(&wci); 855 } 856 857 pageset() 858 { 859 unsigned long pp; 860 861 pp = (unsigned long) pagebuf; 862 pageaddr = kvtop(pp); 863 #ifdef DEBUG 864 debug("pageset: addr %lx\n", pageaddr); 865 #endif 866 } 867 868 869 870 #define near 871 872 static near 873 sendcmd() 874 { 875 /* desired command in global mbits */ 876 877 outb(CTLPORT, mbits | REQUEST); /* set request */ 878 while (inb(STATPORT) & READY); /* wait for ready */ 879 outb(CTLPORT, mbits & ~REQUEST); /* reset request */ 880 while ((inb(STATPORT) & READY) == 0); /* wait for not ready */ 881 } 882 883 static near /* execute command */ 884 cmds(cmd) 885 { 886 register s; 887 888 do s = inb(STATPORT); 889 while ((s & STAT) == STAT); /* wait for ready */ 890 891 if ((s & EXCEP) == 0) /* if exception */ 892 return ERROR; /* error */ 893 894 outb(CMDPORT, cmd); /* output the command */ 895 896 outb(CTLPORT, mbits=ONLINE); /* set & send ONLINE */ 897 sendcmd(); 898 899 return SUCCESS; 900 } 901 902 qicmd(cmd) 903 { 904 return cmds(cmd); 905 } 906 907 rstart() 908 { 909 return cmds(RDDATA); 910 } 911 912 rmark() 913 { 914 return cmds(READFM); 915 } 916 917 wstart() 918 { 919 return cmds(WRTDATA); 920 } 921 922 ioend() 923 { 924 register s; 925 register rval = SUCCESS; 926 927 do s = inb(STATPORT); 928 while ((s & STAT) == STAT); /* wait for ready */ 929 930 if ((s & EXCEP) == 0) /* if exception */ 931 rval = ERROR; /* error */ 932 933 mbits &= ~ONLINE; 934 outb(CTLPORT, mbits); /* reset ONLINE */ 935 outb(MASKREG, wtchan+4); /* turn off dma */ 936 outb(CLEARFF, 0); /* reset direction flag */ 937 938 return rval; 939 } 940 941 wmark() 942 { 943 register s; 944 945 if (cmds(WRITEFM) == ERROR) 946 return ERROR; 947 948 do s = inb(STATPORT); 949 while ((s & STAT) == STAT); /* wait for ready */ 950 951 if ((s & EXCEP) == 0) /* if exception */ 952 return ERROR; /* error */ 953 954 return SUCCESS; 955 } 956 957 rwind() 958 { 959 register s; 960 961 mbits = CMDOFF; 962 963 do s = inb(STATPORT); 964 while ((s & STAT) == STAT); /* wait for ready */ 965 966 outb(CMDPORT, REWIND); 967 sendcmd(); 968 969 return SUCCESS; 970 } 971 972 rdstatus(stp) 973 char *stp; /* pointer to 6 byte buffer */ 974 { 975 register s; 976 int n; 977 978 do s = inb(STATPORT); 979 while ((s & STAT) == STAT); /* wait for ready or exception */ 980 981 outb(CMDPORT, RDSTAT); 982 sendcmd(); /* send read status command */ 983 984 for (n=0; n<6; n++) 985 { 986 #ifdef DEBUGx 987 debug("rdstatus: waiting, byte %d\n", n); 988 #endif 989 do s = inb(STATPORT); 990 while ((s & STAT) == STAT); /* wait for ready */ 991 #ifdef DEBUGx 992 debug("rdstatus: done\n"); 993 #endif 994 if ((s & EXCEP) == 0) /* if exception */ 995 return ERROR; /* error */ 996 997 *stp++ = inb(DATAPORT); /* read status byte */ 998 999 outb(CTLPORT, mbits | REQUEST); /* set request */ 1000 #ifdef DEBUGx 1001 debug("rdstatus: waiting after request, byte %d\n", n); 1002 #endif 1003 while ((inb(STATPORT)&READY) == 0); /* wait for not ready */ 1004 for (s=100; s>0; s--); /* wait an additional time */ 1005 1006 outb(CTLPORT, mbits & ~REQUEST);/* unset request */ 1007 #ifdef DEBUGx 1008 debug("rdstatus: done\n"); 1009 #endif 1010 } 1011 return SUCCESS; 1012 } 1013 1014 t_reset() 1015 { 1016 register i; 1017 mbits |= RESET; 1018 outb(CTLPORT, mbits); /* send reset */ 1019 DELAY(20); 1020 mbits &= ~RESET; 1021 outb(CTLPORT, mbits); /* turn off reset */ 1022 if ((inb(STATPORT) & RESETMASK) == RESETVAL) 1023 return SUCCESS; 1024 return ERROR; 1025 } 1026 1027 static 1028 dma() 1029 { 1030 int x=splbio(); 1031 wtdma(); 1032 outb(CLEARFF, 0); 1033 outb(MODEREG, mode); /* set dma mode */ 1034 outb(dmareg, bufptr & 0xFF); 1035 outb(dmareg, (bufptr>>8) & 0xFF); 1036 outb(pagereg, (bufptr>>16) & 0xFF); 1037 outb(dmareg+1, (BLKSIZE-1) & 0xFF); 1038 outb(dmareg+1, (BLKSIZE-1) >> 8); 1039 outb(wtport, eqdma+ONLINE); 1040 outb(MASKREG, wtchan); /* enable command to 8237, start dma */ 1041 splx(x); 1042 } 1043 1044 static near 1045 wtstart(buf, cnt) 1046 long buf; 1047 int cnt; 1048 { 1049 register s; 1050 1051 bufptr = buf; /* init statics */ 1052 numbytes = cnt; 1053 wci = 0; /* init flags */ 1054 exflag = 0; 1055 bytes = 0; /* init counter */ 1056 1057 do s = inb(STATPORT) & STAT; 1058 while (s == STAT); /* wait for ready or error */ 1059 1060 if (s & EXCEP) /* no error */ 1061 { 1062 dma(); 1063 return SUCCESS; 1064 } 1065 return ERROR; /* error */ 1066 } 1067 1068 rtape(buf, cnt) 1069 long buf; /* physical address */ 1070 int cnt; /* number of bytes */ 1071 { 1072 mode = dma_read; 1073 return wtstart(buf,cnt); 1074 } 1075 1076 wtape(buf, cnt) 1077 long buf; /* physical address */ 1078 int cnt; /* number of bytes */ 1079 { 1080 mode = dma_write; 1081 return wtstart(buf,cnt); 1082 } 1083 1084 isr() 1085 { 1086 int stat = inb(wtport); 1087 if (!(stat & EXCEP)) /* exception during I/O */ 1088 { 1089 if (bytes + BLKSIZE >= numbytes) wci = 1; 1090 exflag = 1; 1091 goto isrwake; 1092 } 1093 if ((stat & READY) || !(inb(STATUSREG) & dma_done)) 1094 return; 1095 exflag = 0; 1096 outb(wtport, ONLINE); 1097 bytes += BLKSIZE; 1098 if (bytes >= numbytes) /* normal completion of I/O */ 1099 { 1100 wci = 1; 1101 isrwake: 1102 outb(MASKREG, 4+wtchan); /* turn off dma */ 1103 wtwake(); /* wake up user level */ 1104 } 1105 else 1106 { /* continue I/O */ 1107 bufptr += BLKSIZE; 1108 dma(); 1109 } 1110 } 1111 1112 wtlinit() 1113 { 1114 switch (wtchan) { 1115 case 1: 1116 return; 1117 case 2: 1118 pagereg = 0x81; 1119 dma_done = 4; 1120 break; 1121 case 3: 1122 eqdma = 0x10; 1123 pagereg = 0x82; 1124 dma_done = 8; 1125 break; 1126 } 1127 dma_write = wtchan+0x48; 1128 dma_read = wtchan+0x44; 1129 dmareg = wtchan+wtchan; 1130 } 1131 1132 wtsize() 1133 { 1134 } 1135 1136 wtdump() 1137 { 1138 } 1139 1140 #include "i386/isa/isa_device.h" 1141 #include "i386/isa/icu.h" 1142 1143 int wtprobe(), wtattach(); 1144 struct isa_driver wtdriver = { 1145 wtprobe, wtattach, "wt", 1146 }; 1147 1148 wtprobe(dvp) 1149 struct isa_device *dvp; 1150 { 1151 int val,i,s; 1152 1153 #ifdef lint 1154 wtintr(0); 1155 #endif 1156 1157 wtport = dvp->id_iobase; 1158 if(t_reset() != SUCCESS) return(0); 1159 return(1); 1160 } 1161 1162 wtattach() { } 1163 1164 #endif NWT 1165
Indexes created Sat Oct 25 01:09:55 GMT 2025