wt.c revision 1.5.2.2
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 1.5.2.2 1994/02/02 19:49:51 mycroft Exp $ 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 /* 65 * (Mach) HISTORY 66 * Revision 2.2.1.3 90/01/08 13:29:38 rvb 67 * Add Intel copyright. 68 * [90/01/08 rvb] 69 * 70 * Revision 2.2.1.2 89/12/21 18:00:09 rvb 71 * Change WTPRI to make the streamer tape read/write 72 * interruptible. [lin] 73 * 74 * Revision 2.2.1.1 89/11/10 09:49:49 rvb 75 * ORC likes their streamer port at 0x288. 76 * [89/11/08 rvb] 77 * 78 * Revision 2.2 89/09/25 12:33:02 rvb 79 * Driver was provided by Intel 9/18/89. 80 * [89/09/23 rvb] 81 * 82 */ 83 84 /* 85 * 86 * Copyright 1988, 1989 by Intel Corporation 87 * 88 * Support Bell Tech QIC-02 and WANGTEK QIC-36 or QIC-02 89 */ 90 91 /*#include <sys/errno.h> 92 #include <sys/signal.h> 93 #include <sys/types.h>*/ 94 #include "sys/param.h" 95 #include "sys/buf.h" 96 #include "sys/file.h" 97 #include "sys/proc.h" 98 #include "sys/user.h" 99 #include "i386/isa/wtreg.h" 100 101 #ifdef ORC 102 unsigned wtport = 0x288; /* base I/O port of controller */ 103 #else ORC 104 unsigned wtport = 0x300; /* base I/O port of controller */ 105 #endif ORC 106 /* standard = 0x300 */ 107 /* alternate = 0x338 */ 108 109 unsigned wtchan = 1; /* DMA channel number */ 110 /* stardard = 1 */ 111 /* hardware permits 1, 2 or 3. */ 112 /* (Avoid DMA 2: used by disks) */ 113 114 int first_wtopen_ever = 1; 115 116 117 #define ERROR 1 /* return from tape routines */ 118 #define SUCCESS 0 /* return from tape routines */ 119 120 int wci = 0; 121 int exflag = 0; 122 int bytes = 0; 123 124 static unsigned char eqdma = 0x8; 125 static unsigned char pagereg = 0x83; 126 static unsigned char dmareg = 2; 127 static unsigned char dma_write = 0x49; 128 static unsigned char dma_read = 0x45; 129 static unsigned char dma_done = 2; 130 static unsigned char mode = 0; 131 static unsigned char mbits; /* map bits into each other */ 132 static long bufptr; 133 static unsigned numbytes; 134 /* 135 _wci dw 0 ; interrupt chain finished normally 136 _exflag dw 0 ; exception variable 137 _bytes dw 0 ; current bytes 138 139 eqdma db 8h ; enable dma command: ch1,ch2=8h, ch3=10h 140 pagereg db 83h ; ch1=83h, ch2=81h, ch3=82h 141 dmareg db 2 ; ch1=2, ch2=4, ch3=6 142 dma_write db 49h ; write dma command: 48h+_wtchan 143 dma_read db 45h ; read dma command: 44h+_wtchan 144 dma_done db 2 ; dma done flag: 1<<_wtchan 145 mode db 0 ; dma operation mode 146 lbufptr dw 0 ; buffer pointer to data buffers, low word 147 hbufptr dw 0 ; buffer pointer to data buffers, high word 148 numbytes dw 0 ; number of bytes to read or write (new) 149 */ 150 151 /* tape controller ports */ 152 #define STATPORT wtport 153 #define CTLPORT STATPORT 154 #define CMDPORT (wtport+1) 155 #define DATAPORT CMDPORT 156 157 /* defines for reading out status from wangtek tape controller */ 158 #define READY 0x01 /* ready bit define */ 159 #define EXCEP 0x02 /* exception bit define */ 160 #define STAT (READY|EXCEP) 161 #define RESETMASK 0x7 162 #define RESETVAL (RESETMASK & ~EXCEP) 163 164 /* tape controller control bits (CTLPORT) */ 165 #define ONLINE 0x01 166 #define RESET 0x02 167 #define REQUEST 0x04 /* request command */ 168 #define CMDOFF 0xC0 169 170 /* QIC-02 commands (CMDPORT) */ 171 #define RDDATA 0x80 /* read data */ 172 #define READFM 0xA0 /* read file mark */ 173 #define WRTDATA 0x40 /* write data */ 174 #define WRITEFM 0x60 /* write file mark */ 175 #define RDSTAT 0xC0 /* read status command */ 176 #define REWIND 0x21 /* rewind command (position+bot) */ 177 178 /* 8237 DMA controller regs */ 179 #define STATUSREG 0x8 180 #define MASKREG 0xA 181 #define MODEREG 0xB 182 #define CLEARFF 0xC 183 184 /* streamer tape block size */ 185 #define BLKSIZE 512 186 187 /* Tape characteristics */ 188 #define NBPS 512 /* 512-byte blocks */ 189 #define ERROR 1 /* return from tape routines */ 190 #define SUCCESS 0 /* return from tape routines */ 191 192 /* Minor devs */ 193 #define TP_REWCLOSE(d) ((minor(d)&04) == 0) /* Rewind tape on close if read/write */ 194 #define TP_DENS(dev) ((minor(dev) >> 3) & 03) /* set density */ 195 #define TPHOG(d) 0 /* use Hogproc during tape I/O */ 196 197 /* defines for wtflags */ 198 #define TPINUSE 0x0001 /* tape is already open */ 199 #define TPREAD 0x0002 /* tape is only open for reading */ 200 #define TPWRITE 0x0004 /* tape is only open for writing */ 201 #define TPSTART 0x0008 /* tape must be rewound and reset */ 202 #define TPDEAD 0x0010 /* tape drive does not work or driver error */ 203 #define TPSESS 0x0020 /* no more reads or writes allowed in session */ 204 /* for example, when tape has to be changed */ 205 #define TPSTOP 0x0040 /* Stop command outstanding */ 206 #define TPREW 0x0080 /* Rewind command outstanding, see wtdsl2() */ 207 #define TPVOL 0x0100 /* Read file mark, or hit end of tape */ 208 #define TPWO 0x0200 /* write command outstanding */ 209 #define TPRO 0x0400 /* read command outstanding */ 210 #define TPWANY 0x0800 /* write command requested */ 211 #define TPRANY 0x1000 /* read command requested */ 212 #define TPWP 0x2000 /* write protect error seen */ 213 214 unsigned int wtflags = TPSTART; /* state of tape drive */ 215 216 struct buf rwtbuf; /* header for raw i/o */ 217 struct proc *myproc; /* process which opened tape driver */ 218 219 char wtimeron; /* wtimer() active flag */ 220 char wtio; /* dma (i/o) active flag */ 221 char isrlock; /* isr() flag */ 222 223 struct proc * Hogproc; /* no Hogproc on Microport */ 224 #define ftoseg(x) ((unsigned) (x >> 16)) 225 226 struct wtstatus { 227 ushort wt_err; /* code for error encountered */ 228 ushort wt_ercnt; /* number of error blocks */ 229 ushort wt_urcnt; /* number of underruns */ 230 } wterror; 231 232 /* defines for wtstatus.wt_err */ 233 #define TP_POR 0x100 /* Power on/reset occurred */ 234 #define TP_RES1 0x200 /* Reserved for end of media */ 235 #define TP_RES2 0x400 /* Reserved for bus parity */ 236 #define TP_BOM 0x800 /* Beginning of media */ 237 #define TP_MBD 0x1000 /* Marginal block detected */ 238 #define TP_NDT 0x2000 /* No data detected */ 239 #define TP_ILL 0x4000 /* Illegal command */ 240 #define TP_ST1 0x8000 /* Status byte 1 bits */ 241 #define TP_FIL 0x01 /* File mark detected */ 242 #define TP_BNL 0x02 /* Bad block not located */ 243 #define TP_UDA 0x04 /* Unrecoverable data error */ 244 #define TP_EOM 0x08 /* End of media */ 245 #define TP_WRP 0x10 /* Write protected cartridge */ 246 #define TP_USL 0x20 /* Unselected drive */ 247 #define TP_CNI 0x40 /* Cartridge not in place */ 248 #define TP_ST0 0x80 /* Status byte 0 bits */ 249 250 /* Grounds for reporting I/O error to user */ 251 #define TP_ERR0 (TP_BNL|TP_UDA|TP_WRP|TP_CNI|TP_FIL|TP_EOM|TP_USL) 252 #define TP_ERR1 (TP_MBD|TP_NDT|TP_ILL) 253 /* TP_ILL should never happen! */ 254 /* 255 #define TP_ERR0 0x7f 256 #define TP_ERR1 0x7700 257 */ 258 259 /* defines for reading out status from wangtek tape controller */ 260 #define READY 0x01 /* ready bit define */ 261 #define EXCEP 0x02 /* exception bit define */ 262 263 /* sleep priority */ 264 #define WTPRI (PZERO+10) 265 266 char pagebuf[NBPS]; /* buffer of size NBPS */ 267 unsigned long pageaddr; /* physical addr of pagebuf */ 268 /* pageaddr is used with DMA controller */ 269 time_t Hogtime; /* lbolt when Hog timer started */ 270 extern time_t lbolt; 271 272 #define debug printf 273 274 /* 275 * Strategy routine. 276 * 277 * Arguments: 278 * Pointer to buffer structure 279 * Function: 280 * Start transfer. 281 * 282 * It would be nice to have this multiple-threaded. 283 * There is a version of dump from Berkeley that works with multiple processes 284 * trading off with disk & tape I/O. 285 */ 286 287 void 288 wtstrategy(bp) 289 register struct buf *bp; 290 { 291 unsigned ucnt1, ucnt2, finished; 292 unsigned long adr1, adr2; 293 int bad; 294 295 adr1 = kvtop(bp->b_un.b_addr); 296 #ifdef DEBUG 297 debug("bpaddr %x\n", adr1); 298 #endif 299 ucnt1 = bp->b_bcount % NBPG; 300 ucnt2 = 0; 301 adr2 = 0; 302 #ifdef DEBUG 303 debug("WTstart: adr1 %lx cnt %x\n", adr1, ucnt1); 304 #endif 305 /* 64K boundary? (XXX) */ 306 if (ftoseg(adr1) != ftoseg(adr1 + (unsigned) ucnt1 - 1)) { 307 adr2 = (adr1 & 0xffff0000L) + 0x10000L; 308 ucnt2 = (adr1 + ucnt1) - adr2; 309 ucnt1 -= ucnt2; 310 } 311 /* page boundary? */ 312 if (trunc_page(adr1) != trunc_page(adr1 + (unsigned) ucnt1 - 1)) 313 { unsigned u; 314 u = NBPG - ((unsigned)bp->b_un.b_addr & (NBPG-1)); 315 adr2 = kvtop(bp->b_un.b_addr + u); 316 ucnt2 = ucnt1 - u; 317 ucnt1 = u; 318 } 319 /* at file marks and end of tape, we just return '0 bytes available' */ 320 if (wtflags & TPVOL) { 321 bp->b_resid = bp->b_bcount; 322 goto xit; 323 } 324 if ((Hogproc == (struct proc *) 0) && TPHOG(bp->b_dev)) { 325 #ifdef DEBUG 326 printf("setting Hogproc\n"); 327 #endif 328 Hogtime = 0; 329 Hogproc = myproc; 330 } 331 if (bp->b_flags & B_READ) { 332 bad = 0; 333 334 /* For now, we assume that all data will be copied out */ 335 /* If read command outstanding, just skip down */ 336 if (!(wtflags & TPRO)) { 337 if (ERROR == wtsense(TP_WRP)) /* clear status */ 338 goto errxit; 339 #ifdef DEBUG 340 debug("WTread: Start read\n"); 341 #endif 342 if (!(wtflags & TPREAD) || (wtflags & TPWANY) || 343 (rstart() == ERROR)) { 344 #ifdef DEBUG 345 debug("Tpstart: read init error\n"); /* */ 346 #endif 347 goto errxit; 348 } 349 wtflags |= TPRO|TPRANY; 350 } 351 352 finished = 0; 353 /* Take a deep breath */ 354 if (ucnt1) { 355 if ((rtape(adr1, ucnt1) == ERROR) && 356 (wtsense(TP_WRP) == ERROR)) 357 goto endio; 358 /* wait for it */ 359 bad = pollrdy(); 360 finished = bytes; 361 if (bad) 362 goto endio; 363 } 364 /* if a second I/O region, start it */ 365 if (ucnt2) { 366 if ((rtape(adr2, ucnt2) == ERROR) && 367 (wtsense(TP_WRP) == ERROR)) 368 ucnt2 = 0; /* don't poll for me */ 369 } 370 371 /* if second i/o pending wait for it */ 372 if (ucnt2) { 373 pollrdy(); 374 /* whether pollrdy is ok or not */ 375 finished += bytes; 376 } 377 } else { 378 if (wtflags & TPWP) /* write protected */ 379 goto errxit; 380 381 /* If write command outstanding, just skip down */ 382 if (!(wtflags & TPWO)) { 383 if (ERROR == wtsense(0)) { /* clear status */ 384 #ifdef DEBUG 385 debug("TPstart: sense 0\n"); 386 #endif 387 goto errxit; 388 } 389 if (!(wtflags & TPWRITE) || (wtflags & TPRANY) || 390 (wstart() == ERROR)) { 391 #ifdef DEBUG 392 debug("Tpstart: write init error\n"); /* */ 393 #endif 394 wtsense(0); 395 396 errxit: bp->b_flags |= B_ERROR; 397 bp->b_resid = bp->b_bcount; 398 goto xit; 399 } 400 wtflags |= TPWO | TPWANY; 401 } 402 403 /* and hold your nose */ 404 if (ucnt1 && ((wtape(adr1, ucnt1) == ERROR) 405 && (wtsense(0) == ERROR))) 406 finished = bytes; 407 408 else if (ucnt2 && 409 (((ucnt1 && pollrdy()) || 410 (wtape(adr2, ucnt2) == ERROR)) && 411 (wtsense(0) == ERROR))) 412 finished = ucnt1 + NBPS + bytes; 413 /* All writes and/or copyins were fine! */ 414 else 415 finished = bp->b_bcount; 416 bad = pollrdy(); 417 } 418 419 endio: 420 if (bad == EIO) 421 bad = 0; 422 wterror.wt_err = 0; 423 if (exflag && wtsense((bp->b_flags & B_READ) ? TP_WRP : 0)) { 424 if ((wterror.wt_err & TP_ST0) 425 && (wterror.wt_err & (TP_FIL | TP_EOM))) { 426 #ifdef DEBUG 427 debug("WTsta: Hit end of tape\n"); /* */ 428 #endif 429 wtflags |= TPVOL; 430 if (wterror.wt_err & TP_FIL) { 431 if (wtflags & TPRO) 432 /* interrupter is bogus */ 433 rstart(); /* restart read command */ 434 else 435 wtflags &= ~TPWO; 436 finished += NBPS; 437 } 438 /* Reading file marks or writing end of tape return 0 bytes */ 439 } else { 440 bp->b_flags |= B_ERROR; 441 wtflags &= ~(TPWO | TPRO); 442 } 443 } 444 445 if(bad) { 446 bp->b_flags |= B_ERROR; 447 bp->b_error = bad; 448 } 449 bp->b_resid = bp->b_bcount - finished; 450 xit: 451 biodone(bp); 452 if (wtimeron) 453 Hogtime = lbolt; 454 else if (Hogproc == myproc) 455 Hogproc = (struct proc *) 0; 456 } 457 458 /* 459 * simulate an interrupt periodically while I/O is going 460 * this is necessary in case interrupts get eaten due to 461 * multiple devices on a single IRQ line 462 */ 463 wtimer() 464 { 465 466 /* If I/O going and not in isr(), simulate interrupt 467 * If no I/O for at least 1 second, stop being a Hog 468 * If I/O done and not a Hog, turn off wtimer() 469 */ 470 if (wtio && !isrlock) 471 isr(); 472 473 if ((Hogproc == myproc) && Hogtime && (lbolt-Hogtime > hz)) 474 Hogproc = (struct proc *) 0; 475 476 if (wtio || (Hogproc == myproc)) 477 timeout(wtimer, (caddr_t) 0, hz); 478 else 479 wtimeron = 0; 480 } 481 482 483 wtrawio(bp) 484 struct buf *bp; 485 { 486 487 wtstrategy(bp); 488 biowait(bp); 489 return(0); 490 } 491 492 /* 493 * ioctl routine 494 * for user level QIC commands only 495 */ 496 wtioctl(dev, cmd, arg, mode) 497 int dev, cmd; 498 unsigned long arg; 499 int mode; 500 { 501 502 if (cmd == WTQICMD) { 503 if ((qicmd((int)arg) == ERROR) || (rdyexc(hz) == ERROR)) { 504 wtsense(0); 505 return(EIO); 506 } 507 return(0); 508 } 509 return(EINVAL); 510 } 511 512 /* 513 * open routine 514 * called on every device open 515 */ 516 wtopen(dev, flag) 517 int dev, flag; 518 { 519 520 if (first_wtopen_ever) { 521 wtinit(); 522 first_wtopen_ever = 0; 523 } 524 #ifdef DEBUG 525 printf("wtopen ...\n"); 526 #endif 527 if (!pageaddr) 528 return(ENXIO); 529 if (wtflags & TPINUSE) 530 return(ENXIO); 531 if (wtflags & TPDEAD) 532 return(EIO); 533 /* If a rewind from the last session is going on, wait */ 534 while(wtflags & TPREW) { 535 #ifdef DEBUG 536 debug("Waiting for rew to finish\n"); 537 #endif 538 DELAY(1000000); /* delay one second */ 539 } 540 /* Only do reset and select when tape light is off, and tape is rewound. 541 * This allows multiple volumes. */ 542 if (wtflags & TPSTART) { 543 if (t_reset() != SUCCESS) 544 return(ENXIO); 545 #ifdef DEBUG 546 debug("reset done. calling wtsense\n"); 547 #endif 548 if (wtsense(TP_WRP) == ERROR) 549 return (EIO); 550 #ifdef DEBUG 551 debug("wtsense done\n"); 552 #endif 553 wtflags &= ~TPSTART; 554 } 555 556 wtflags = TPINUSE; 557 if (flag & FREAD) 558 wtflags |= TPREAD; 559 if (flag & FWRITE) 560 wtflags |= TPWRITE; 561 rwtbuf.b_flags = 0; 562 myproc = curproc; /* for comparison */ 563 #ifdef not 564 switch(TP_DENS(dev)) { 565 case 0: 566 cmds(0x28); 567 break; 568 case 1: 569 cmds(0x29); 570 break; 571 case 2: 572 cmds(0x27); 573 break; 574 case 3: 575 cmds(0x24); 576 } 577 #endif 578 return(0); 579 } 580 581 /* 582 * close routine 583 * called on last device close 584 * If not rewind-on-close, leave read or write command intact. 585 */ 586 wtclose(dev) 587 { 588 int wtdsl2(); 589 590 #ifdef DEBUG 591 debug("WTclose:\n"); 592 #endif 593 if (Hogproc == myproc) 594 Hogproc = (struct proc *) 0; 595 if (!exflag && (wtflags & TPWANY) && !(wtflags & (TPSESS | TPDEAD))) { 596 if (!(wtflags & TPWO)) 597 wstart(); 598 #ifdef DEBUG 599 debug("WT: Writing file mark\n"); 600 #endif 601 wmark(); /* write file mark */ 602 #ifdef DEBUG 603 debug("WT: Wrote file mark, going to wait\n"); 604 #endif 605 if (rdyexc(hz/10) == ERROR) 606 wtsense(0); 607 } 608 if (TP_REWCLOSE(dev) || (wtflags & (TPSESS | TPDEAD))) { 609 /* rewind tape to beginning of tape, deselect tape, and make a note */ 610 /* don't wait until rewind, though */ 611 /* Ending read or write causes rewind to happen, if no error, 612 * and READY and EXCEPTION stay up until it finishes */ 613 if (wtflags & (TPRO | TPWO)) { 614 #ifdef DEBUG 615 debug("End read or write\n"); 616 #endif 617 rdyexc(hz/10); 618 ioend(); 619 wtflags &= ~(TPRO | TPWO); 620 } else 621 wtwind(); 622 wtflags |= TPSTART | TPREW; 623 timeout(wtdsl2, 0, hz); 624 } else if (!(wtflags & (TPVOL | TPWANY))) { 625 /* space forward to after next file mark no writing done */ 626 /* This allows skipping data without reading it.*/ 627 #ifdef DEBUG 628 debug("Reading past file mark\n"); 629 #endif 630 if (!(wtflags & TPRO)) 631 rstart(); 632 rmark(); 633 if (rdyexc(hz/10)) 634 wtsense(TP_WRP); 635 } 636 wtflags &= TPREW | TPDEAD | TPSTART | TPRO | TPWO; 637 return(0); 638 } 639 640 /* return ERROR if user I/O request should receive an I/O error code */ 641 642 wtsense(ignor) 643 { 644 645 wtflags &= ~(TPRO | TPWO); 646 #ifdef DEBUGx 647 debug("WTsense: start "); 648 #endif 649 if (rdstatus(&wterror) == ERROR) { 650 #ifdef DEBUG 651 debug("WTsense: Can't read status\n"); 652 #endif 653 return(ERROR); 654 } 655 #ifdef DEBUG 656 if (wterror.wt_err & (TP_ST0 | TP_ST1)) 657 debug("Tperror: status %x error %d underruns %d\n", 658 wterror.wt_err, wterror.wt_ercnt, wterror.wt_urcnt); 659 else 660 debug("done. no error\n"); 661 #endif 662 wterror.wt_err &= ~ignor; /* ignore certain errors */ 663 reperr(wterror.wt_err); 664 if (((wterror.wt_err & TP_ST0) && (wterror.wt_err & TP_ERR0)) || 665 ((wterror.wt_err & TP_ST1) && (wterror.wt_err & TP_ERR1))) 666 return ERROR; 667 668 return SUCCESS; 669 } 670 671 /* lifted from tdriver.c from Wangtek */ 672 reperr(srb0) 673 int srb0; 674 { 675 int s0 = srb0 & (TP_ERR0 | TP_ERR1); /* find out which exception to report */ 676 677 if (s0) { 678 if (s0 & TP_USL) 679 sterr("Drive not online"); 680 else if (s0 & TP_CNI) 681 sterr("No cartridge"); 682 else if ((s0 & TP_WRP) && !(wtflags & TPWP)) 683 { 684 sterr("Tape is write protected"); 685 wtflags |= TPWP; 686 } 687 /* 688 if (s0 & TP_FIL) 689 sterr("Filemark detected"); 690 */ 691 else if (s0 & TP_BNL) 692 sterr("Block in error not located"); 693 else if (s0 & TP_UDA) 694 sterr("Unrecoverable data error"); 695 #ifdef notdef 696 else if (s0 & TP_EOM) 697 sterr("End of tape"); 698 #endif 699 else if (s0 & TP_NDT) 700 sterr("No data detected"); 701 #ifdef notdef 702 if (s0 & TP_POR) 703 sterr("Reset occured"); 704 #endif 705 else if (s0 & TP_BOM) 706 sterr("Beginning of tape"); 707 else if (s0 & TP_ILL) 708 sterr("Illegal command"); 709 } 710 } 711 712 sterr(errstr) 713 char *errstr; 714 { 715 716 printf("Streamer: %s\n", errstr); 717 } 718 719 /* Wait until rewind finishes, and deselect drive */ 720 wtdsl2() 721 { 722 int stat; 723 724 stat = inb(wtport) & (READY | EXCEP); 725 #ifdef DEBUG 726 debug("Timeout: Waiting for rewind to finish: stat %x\n", stat); 727 #endif 728 switch (stat) { 729 /* They're active low, ya'know */ 730 case READY|EXCEP: 731 timeout(wtdsl2, (caddr_t) 0, hz); 732 return; 733 case EXCEP: 734 wtflags &= ~TPREW; 735 return; 736 case READY: 737 case 0: 738 wtflags &= ~TPREW; 739 sterr("Rewind failed"); 740 wtsense(TP_WRP); 741 return; 742 } 743 } 744 745 wtwind() 746 { 747 748 #ifdef DEBUG 749 debug("WT: About to rewind\n"); 750 #endif 751 rwind(); /* actually start rewind */ 752 } 753 754 wtintr(unit) 755 int unit; 756 { 757 758 if (wtflags & (TPWO|TPRO)) { 759 isrlock = 1; 760 if (wtio) 761 isr(); 762 isrlock = 0; 763 } 764 } 765 766 wtinit() { 767 if (wtchan < 1 || wtchan > 3) { 768 sterr("Bad DMA channel, cannot init driver"); 769 return; 770 } 771 wtlinit(); /* init assembly language variables */ 772 pageset(); 773 } 774 775 rdyexc(ticks) 776 { 777 int s; 778 779 #ifdef DEBUG 780 int os = 0xffff; /* force printout first time */ 781 #endif 782 for (;;) { /* loop until ready or exception */ 783 s=(inb(wtport) & 0xff); /* read the status register */ 784 #ifdef DEBUG 785 if (os != s) { 786 debug("Status reg = %x\n", s); /* */ 787 os = s; 788 } 789 #endif 790 if (!(s & EXCEP)) /* check if exception have occured */ 791 break; 792 if (!(s & READY)) /* check if controller is ready */ 793 break; 794 s = splbio(); 795 DELAY((ticks/hz)*1000000); /* */ 796 splx(s); 797 } 798 #ifdef DEBUG 799 debug("Status reg = %x on return\n", s); /* */ 800 #endif 801 return((s & EXCEP) ? SUCCESS : ERROR); /* return exception if it occured */ 802 } 803 804 pollrdy() 805 { 806 int s; 807 808 #ifdef DEBUG 809 debug("Pollrdy\n"); 810 #endif 811 s = splbio(); 812 while (wtio) { 813 int error; 814 815 if (error = tsleep((caddr_t)&wci, WTPRI | PCATCH, 816 "wtpoll", 0)) { 817 splx(s); 818 return(error); 819 } 820 } 821 splx(s); 822 #ifdef DEBUG 823 debug("Finish poll, wci %d exflag %d\n", wci, exflag); 824 #endif 825 return (EIO); 826 } 827 828 wtdma() /* start up i/o operation, called from dma() in wtlib1.s */ 829 { 830 wtio = 1; 831 if (!wtimeron) { 832 wtimeron = 1; 833 timeout(wtimer, (caddr_t) 0, hz/2); 834 } 835 } 836 837 wtwake() /* end i/o operation, called from isr() in wtlib1.s */ 838 { 839 840 wtio = 0; 841 wakeup(&wci); 842 } 843 844 pageset() 845 { 846 unsigned long pp; 847 848 pp = (unsigned long) pagebuf; 849 pageaddr = kvtop(pp); 850 #ifdef DEBUG 851 debug("pageset: addr %lx\n", pageaddr); 852 #endif 853 } 854 855 static 856 sendcmd() 857 { 858 859 /* desired command in global mbits */ 860 outb(CTLPORT, mbits | REQUEST); /* set request */ 861 while (inb(STATPORT) & READY); /* wait for ready */ 862 outb(CTLPORT, mbits & ~REQUEST); /* reset request */ 863 while ((inb(STATPORT) & READY) == 0); /* wait for not ready */ 864 } 865 866 static /* execute command */ 867 cmds(cmd) 868 { 869 register s; 870 871 do 872 s = inb(STATPORT); 873 while ((s & STAT) == STAT); /* wait for ready */ 874 875 if ((s & EXCEP) == 0) /* if exception */ 876 return ERROR; /* error */ 877 878 outb(CMDPORT, cmd); /* output the command */ 879 880 outb(CTLPORT, mbits=ONLINE); /* set & send ONLINE */ 881 sendcmd(); 882 883 return SUCCESS; 884 } 885 886 qicmd(cmd) 887 { 888 return cmds(cmd); 889 } 890 891 rstart() 892 { 893 894 return cmds(RDDATA); 895 } 896 897 rmark() 898 { 899 900 return cmds(READFM); 901 } 902 903 wstart() 904 { 905 906 return cmds(WRTDATA); 907 } 908 909 ioend() 910 { 911 register s; 912 register rval = SUCCESS; 913 914 do 915 s = inb(STATPORT); 916 while ((s & STAT) == STAT); /* wait for ready */ 917 918 if ((s & EXCEP) == 0) /* if exception */ 919 rval = ERROR; /* error */ 920 921 mbits &= ~ONLINE; 922 outb(CTLPORT, mbits); /* reset ONLINE */ 923 outb(MASKREG, wtchan+4); /* turn off dma */ 924 outb(CLEARFF, 0); /* reset direction flag */ 925 926 return rval; 927 } 928 929 wmark() 930 { 931 register s; 932 933 if (cmds(WRITEFM) == ERROR) 934 return ERROR; 935 936 do 937 s = inb(STATPORT); 938 while ((s & STAT) == STAT); /* wait for ready */ 939 940 if ((s & EXCEP) == 0) /* if exception */ 941 return ERROR; /* error */ 942 943 return SUCCESS; 944 } 945 946 rwind() 947 { 948 register s; 949 950 mbits = CMDOFF; 951 952 do 953 s = inb(STATPORT); 954 while ((s & STAT) == STAT); /* wait for ready */ 955 956 outb(CMDPORT, REWIND); 957 sendcmd(); 958 959 return SUCCESS; 960 } 961 962 rdstatus(stp) 963 char *stp; /* pointer to 6 byte buffer */ 964 { 965 register s; 966 int n; 967 968 do 969 s = inb(STATPORT); 970 while ((s & STAT) == STAT); /* wait for ready or exception */ 971 972 outb(CMDPORT, RDSTAT); 973 sendcmd(); /* send read status command */ 974 975 for (n = 0; n < 6; n++) { 976 #ifdef DEBUGx 977 debug("rdstatus: waiting, byte %d\n", n); 978 #endif 979 do 980 s = inb(STATPORT); 981 while ((s & STAT) == STAT); /* wait for ready */ 982 #ifdef DEBUGx 983 debug("rdstatus: done\n"); 984 #endif 985 if ((s & EXCEP) == 0) /* if exception */ 986 return ERROR; /* error */ 987 988 *stp++ = inb(DATAPORT); /* read status byte */ 989 990 outb(CTLPORT, mbits | REQUEST); /* set request */ 991 #ifdef DEBUGx 992 debug("rdstatus: waiting after request, byte %d\n", n); 993 #endif 994 while ((inb(STATPORT) & READY) == 0); /* wait for not ready */ 995 for (s=100; s>0; s--); /* wait an additional time */ 996 997 outb(CTLPORT, mbits & ~REQUEST);/* unset request */ 998 #ifdef DEBUGx 999 debug("rdstatus: done\n"); 1000 #endif 1001 } 1002 return SUCCESS; 1003 } 1004 1005 t_reset() 1006 { 1007 1008 mbits |= RESET; 1009 outb(CTLPORT, mbits); /* send reset */ 1010 DELAY(20); 1011 mbits &= ~RESET; 1012 outb(CTLPORT, mbits); /* turn off reset */ 1013 if ((inb(STATPORT) & RESETMASK) == RESETVAL) 1014 return SUCCESS; 1015 return ERROR; 1016 } 1017 1018 static 1019 dma() 1020 { 1021 int s = splbio(); 1022 1023 wtdma(); 1024 outb(CLEARFF, 0); 1025 outb(MODEREG, mode); /* set dma mode */ 1026 outb(dmareg, bufptr & 0xFF); 1027 outb(dmareg, (bufptr>>8) & 0xFF); 1028 outb(pagereg, (bufptr>>16) & 0xFF); 1029 outb(dmareg+1, (BLKSIZE-1) & 0xFF); 1030 outb(dmareg+1, (BLKSIZE-1) >> 8); 1031 outb(wtport, eqdma+ONLINE); 1032 outb(MASKREG, wtchan); /* enable command to 8237, start dma */ 1033 splx(s); 1034 } 1035 1036 static 1037 wtstart(buf, cnt) 1038 long buf; 1039 int cnt; 1040 { 1041 register s; 1042 1043 bufptr = buf; /* init statics */ 1044 numbytes = cnt; 1045 wci = 0; /* init flags */ 1046 exflag = 0; 1047 bytes = 0; /* init counter */ 1048 1049 do 1050 s = inb(STATPORT); 1051 while ((s & STAT) == STAT); /* wait for ready or error */ 1052 1053 if (s & EXCEP) { /* no error */ 1054 dma(); 1055 return SUCCESS; 1056 } 1057 return ERROR; /* error */ 1058 } 1059 1060 rtape(buf, cnt) 1061 long buf; /* physical address */ 1062 int cnt; /* number of bytes */ 1063 { 1064 1065 mode = dma_read; 1066 return wtstart(buf,cnt); 1067 } 1068 1069 wtape(buf, cnt) 1070 long buf; /* physical address */ 1071 int cnt; /* number of bytes */ 1072 { 1073 1074 mode = dma_write; 1075 return wtstart(buf,cnt); 1076 } 1077 1078 isr() 1079 { 1080 int stat = inb(wtport); 1081 1082 if (!(stat & EXCEP)) { /* exception during I/O */ 1083 if (bytes + BLKSIZE >= numbytes) wci = 1; 1084 exflag = 1; 1085 goto isrwake; 1086 } 1087 if ((stat & READY) || !(inb(STATUSREG) & dma_done)) 1088 return; 1089 exflag = 0; 1090 outb(wtport, ONLINE); 1091 bytes += BLKSIZE; 1092 if (bytes >= numbytes) { /* normal completion of I/O */ 1093 wci = 1; 1094 isrwake: 1095 outb(MASKREG, 4+wtchan); /* turn off dma */ 1096 wtwake(); /* wake up user level */ 1097 } else { /* continue I/O */ 1098 bufptr += BLKSIZE; 1099 dma(); 1100 } 1101 } 1102 1103 wtlinit() 1104 { 1105 switch (wtchan) { 1106 case 1: 1107 return; 1108 case 2: 1109 pagereg = 0x81; 1110 dma_done = 4; 1111 break; 1112 case 3: 1113 eqdma = 0x10; 1114 pagereg = 0x82; 1115 dma_done = 8; 1116 break; 1117 } 1118 dma_write = wtchan+0x48; 1119 dma_read = wtchan+0x44; 1120 dmareg = wtchan+wtchan; 1121 } 1122 1123 wtsize() 1124 { 1125 } 1126 1127 wtdump() 1128 { 1129 } 1130 1131 #include "i386/isa/isa_device.h" 1132 #include "i386/isa/icu.h" 1133 1134 int wtprobe(), wtattach(); 1135 struct isa_driver wtdriver = { 1136 wtprobe, wtattach, "wt", 1137 }; 1138 1139 wtprobe(dvp) 1140 struct isa_device *dvp; 1141 { 1142 int val,i,s; 1143 1144 #ifdef lint 1145 wtintr(0); 1146 #endif 1147 1148 wtport = dvp->id_iobase; 1149 if(t_reset() != SUCCESS) return(0); 1150 return(1); 1151 } 1152 1153 wtattach() { } 1154
Indexes created Sun Oct 19 21:10:07 GMT 2025