1 /*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)wt.c 7.1 (Berkeley) 05/09/91 8 */ 9 10 /* 11 * 12 * Copyright (c) 1989 Carnegie-Mellon University. 13 * All rights reserved. 14 * 15 * Authors: Robert Baron 16 * 17 * Permission to use, copy, modify and distribute this software and 18 * its documentation is hereby granted, provided that both the copyright 19 * notice and this permission notice appear in all copies of the 20 * software, derivative works or modified versions, and any portions 21 * thereof, and that both notices appear in supporting documentation. 22 * 23 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 24 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 25 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 26 * 27 * Carnegie Mellon requests users of this software to return to 28 * 29 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 30 * School of Computer Science 31 * Carnegie Mellon University 32 * Pittsburgh PA 15213-3890 33 * 34 * any improvements or extensions that they make and grant Carnegie the 35 * rights to redistribute these changes. 36 */ 37 38 #include "wt.h" 39 #if NWT > 0 40 /* 41 * HISTORY 42 * $Log: wt.c,v $ 43 * Revision 2.2.1.3 90/01/08 13:29:38 rvb 44 * Add Intel copyright. 45 * [90/01/08 rvb] 46 * 47 * Revision 2.2.1.2 89/12/21 18:00:09 rvb 48 * Change WTPRI to make the streamer tape read/write 49 * interruptible. [lin] 50 * 51 * Revision 2.2.1.1 89/11/10 09:49:49 rvb 52 * ORC likes their streamer port at 0x288. 53 * [89/11/08 rvb] 54 * 55 * Revision 2.2 89/09/25 12:33:02 rvb 56 * Driver was provided by Intel 9/18/89. 57 * [89/09/23 rvb] 58 * 59 */ 60 61 /* 62 * 63 * Copyright 1988, 1989 by Intel Corporation 64 * 65 * Support Bell Tech QIC-02 and WANGTEK QIC-36 or QIC-02 66 */ 67 68 /*#include <sys/errno.h> 69 #include <sys/signal.h> 70 #include <sys/types.h>*/ 71 #include "sys/param.h" 72 #include "sys/buf.h" 73 #include "sys/file.h" 74 #include "sys/proc.h" 75 #include "sys/user.h" 76 #include "i386/isa/wtreg.h" 77 78 #ifdef ORC 79 unsigned wtport = 0x288; /* base I/O port of controller */ 80 #else ORC 81 unsigned wtport = 0x300; /* base I/O port of controller */ 82 #endif ORC 83 /* standard = 0x300 */ 84 /* alternate = 0x338 */ 85 86 unsigned wtchan = 1; /* DMA channel number */ 87 /* stardard = 1 */ 88 /* hardware permits 1, 2 or 3. */ 89 /* (Avoid DMA 2: used by disks) */ 90 91 int first_wtopen_ever = 1; 92 93 94 #define ERROR 1 /* return from tape routines */ 95 #define SUCCESS 0 /* return from tape routines */ 96 97 int wci = 0; 98 int exflag = 0; 99 int bytes = 0; 100 101 static unsigned char eqdma = 0x8; 102 static unsigned char pagereg = 0x83; 103 static unsigned char dmareg = 2; 104 static unsigned char dma_write = 0x49; 105 static unsigned char dma_read = 0x45; 106 static unsigned char dma_done = 2; 107 static unsigned char mode = 0; 108 static unsigned char mbits; /* map bits into each other */ 109 static long bufptr; 110 static unsigned numbytes; 111 /* 112 _wci dw 0 ; interrupt chain finished normally 113 _exflag dw 0 ; exception variable 114 _bytes dw 0 ; current bytes 115 116 eqdma db 8h ; enable dma command: ch1,ch2=8h, ch3=10h 117 pagereg db 83h ; ch1=83h, ch2=81h, ch3=82h 118 dmareg db 2 ; ch1=2, ch2=4, ch3=6 119 dma_write db 49h ; write dma command: 48h+_wtchan 120 dma_read db 45h ; read dma command: 44h+_wtchan 121 dma_done db 2 ; dma done flag: 1<<_wtchan 122 mode db 0 ; dma operation mode 123 lbufptr dw 0 ; buffer pointer to data buffers, low word 124 hbufptr dw 0 ; buffer pointer to data buffers, high word 125 numbytes dw 0 ; number of bytes to read or write (new) 126 */ 127 128 #define PAGESIZ 4096 129 #define HZ 60 130 131 /* tape controller ports */ 132 #define STATPORT wtport 133 #define CTLPORT STATPORT 134 #define CMDPORT (wtport+1) 135 #define DATAPORT CMDPORT 136 137 /* defines for reading out status from wangtek tape controller */ 138 #define READY 0x01 /* ready bit define */ 139 #define EXCEP 0x02 /* exception bit define */ 140 #define STAT (READY|EXCEP) 141 #define RESETMASK 0x7 142 #define RESETVAL (RESETMASK & ~EXCEP) 143 144 /* tape controller control bits (CTLPORT) */ 145 #define ONLINE 0x01 146 #define RESET 0x02 147 #define REQUEST 0x04 /* request command */ 148 #define CMDOFF 0xC0 149 150 /* QIC-02 commands (CMDPORT) */ 151 #define RDDATA 0x80 /* read data */ 152 #define READFM 0xA0 /* read file mark */ 153 #define WRTDATA 0x40 /* write data */ 154 #define WRITEFM 0x60 /* write file mark */ 155 #define RDSTAT 0xC0 /* read status command */ 156 #define REWIND 0x21 /* rewind command (position+bot) */ 157 158 /* 8237 DMA controller regs */ 159 #define STATUSREG 0x8 160 #define MASKREG 0xA 161 #define MODEREG 0xB 162 #define CLEARFF 0xC 163 164 /* streamer tape block size */ 165 #define BLKSIZE 512 166 167 /* Tape characteristics */ 168 #define NBPS 512 /* 512-byte blocks */ 169 #define ERROR 1 /* return from tape routines */ 170 #define SUCCESS 0 /* return from tape routines */ 171 172 /* Minor devs */ 173 #define TP_REWCLOSE(d) ((minor(d)&04) == 0) /* Rewind tape on close if read/write */ 174 #define TP_DENS(dev) ((minor(dev) >> 3) & 03) /* set density */ 175 #define TPHOG(d) 0 /* use Hogproc during tape I/O */ 176 177 /* defines for wtflags */ 178 #define TPINUSE 0x0001 /* tape is already open */ 179 #define TPREAD 0x0002 /* tape is only open for reading */ 180 #define TPWRITE 0x0004 /* tape is only open for writing */ 181 #define TPSTART 0x0008 /* tape must be rewound and reset */ 182 #define TPDEAD 0x0010 /* tape drive does not work or driver error */ 183 #define TPSESS 0x0020 /* no more reads or writes allowed in session */ 184 /* for example, when tape has to be changed */ 185 #define TPSTOP 0x0040 /* Stop command outstanding */ 186 #define TPREW 0x0080 /* Rewind command outstanding, see wtdsl2() */ 187 #define TPVOL 0x0100 /* Read file mark, or hit end of tape */ 188 #define TPWO 0x0200 /* write command outstanding */ 189 #define TPRO 0x0400 /* read command outstanding */ 190 #define TPWANY 0x0800 /* write command requested */ 191 #define TPRANY 0x1000 /* read command requested */ 192 #define TPWP 0x2000 /* write protect error seen */ 193 194 unsigned int wtflags = TPSTART; /* state of tape drive */ 195 196 struct buf rwtbuf; /* header for raw i/o */ 197 struct proc *myproc; /* process which opened tape driver */ 198 199 char wtimeron; /* wtimer() active flag */ 200 char wtio; /* dma (i/o) active flag */ 201 char isrlock; /* isr() flag */ 202 203 struct proc * Hogproc; /* no Hogproc on Microport */ 204 #define ftoseg(x) ((unsigned) (x >> 16)) 205 206 struct wtstatus { 207 ushort wt_err; /* code for error encountered */ 208 ushort wt_ercnt; /* number of error blocks */ 209 ushort wt_urcnt; /* number of underruns */ 210 } wterror; 211 212 /* defines for wtstatus.wt_err */ 213 #define TP_POR 0x100 /* Power on/reset occurred */ 214 #define TP_RES1 0x200 /* Reserved for end of media */ 215 #define TP_RES2 0x400 /* Reserved for bus parity */ 216 #define TP_BOM 0x800 /* Beginning of media */ 217 #define TP_MBD 0x1000 /* Marginal block detected */ 218 #define TP_NDT 0x2000 /* No data detected */ 219 #define TP_ILL 0x4000 /* Illegal command */ 220 #define TP_ST1 0x8000 /* Status byte 1 bits */ 221 #define TP_FIL 0x01 /* File mark detected */ 222 #define TP_BNL 0x02 /* Bad block not located */ 223 #define TP_UDA 0x04 /* Unrecoverable data error */ 224 #define TP_EOM 0x08 /* End of media */ 225 #define TP_WRP 0x10 /* Write protected cartridge */ 226 #define TP_USL 0x20 /* Unselected drive */ 227 #define TP_CNI 0x40 /* Cartridge not in place */ 228 #define TP_ST0 0x80 /* Status byte 0 bits */ 229 230 /* Grounds for reporting I/O error to user */ 231 #define TP_ERR0 (TP_BNL|TP_UDA|TP_WRP|TP_CNI|TP_FIL|TP_EOM|TP_USL) 232 #define TP_ERR1 (TP_MBD|TP_NDT|TP_ILL) 233 /* TP_ILL should never happen! */ 234 /* 235 #define TP_ERR0 0x7f 236 #define TP_ERR1 0x7700 237 */ 238 239 /* defines for reading out status from wangtek tape controller */ 240 #define READY 0x01 /* ready bit define */ 241 #define EXCEP 0x02 /* exception bit define */ 242 243 /* sleep priority */ 244 #define WTPRI (PZERO+10) 245 246 char pagebuf[NBPS]; /* buffer of size NBPS */ 247 unsigned long pageaddr; /* physical addr of pagebuf */ 248 /* pageaddr is used with DMA controller */ 249 time_t Hogtime; /* lbolt when Hog timer started */ 250 extern time_t lbolt; 251 252 #define debug printf 253 254 /* 255 * Strategy routine. 256 * 257 * Arguments: 258 * Pointer to buffer structure 259 * Function: 260 * Start transfer. 261 * 262 * It would be nice to have this multiple-threaded. 263 * There is a version of dump from Berkeley that works with multiple processes 264 * trading off with disk & tape I/O. 265 */ 266 267 int 268 wtstrategy(bp) 269 register struct buf *bp; 270 { 271 unsigned ucnt1, ucnt2, finished; 272 unsigned long adr1, adr2; 273 int bad; 274 275 adr1 = kvtop(bp->b_un.b_addr); 276 #ifdef DEBUG 277 debug("bpaddr %x\n", adr1); 278 #endif 279 ucnt1 = bp->b_bcount; 280 ucnt2 = 0; 281 adr2 = 0; 282 #ifdef DEBUG 283 debug("WTstart: adr1 %lx cnt %x\n", adr1, ucnt1); 284 #endif 285 if (ftoseg(adr1) != ftoseg(adr1 + (unsigned) ucnt1 - 1)) 286 { 287 adr2 = (adr1 & 0xffff0000L) + 0x10000L; 288 ucnt2 = (adr1 + ucnt1) - adr2; 289 ucnt1 -= ucnt2; 290 } 291 /* at file marks and end of tape, we just return '0 bytes available' */ 292 if (wtflags & TPVOL) { 293 bp->b_resid = bp->b_bcount; 294 goto xit; 295 } 296 if ((Hogproc == (struct proc *) 0) && TPHOG(bp->b_dev)) 297 { 298 #ifdef DEBUG 299 printf("setting Hogproc\n"); 300 #endif 301 Hogtime = 0; 302 Hogproc = myproc; 303 } 304 if (bp->b_flags & B_READ) { 305 bad = 0; 306 307 /* For now, we assume that all data will be copied out */ 308 /* If read command outstanding, just skip down */ 309 if (!(wtflags & TPRO)) { 310 if (ERROR == wtsense(TP_WRP)) /* clear status */ 311 goto errxit; 312 #ifdef DEBUG 313 debug("WTread: Start read\n"); 314 #endif 315 if (!(wtflags & TPREAD) || (wtflags & TPWANY) || 316 (rstart() == ERROR)) { 317 #ifdef DEBUG 318 debug("Tpstart: read init error\n"); /* */ 319 #endif 320 goto errxit; 321 } 322 wtflags |= TPRO|TPRANY; 323 } 324 325 finished = 0; 326 /* Take a deep breath */ 327 if (ucnt1) { 328 if ((rtape(adr1, ucnt1) == ERROR) && 329 (wtsense(TP_WRP) == ERROR)) 330 goto endio; 331 /* wait for it */ 332 bad = pollrdy(); 333 finished = bytes; 334 if (bad) 335 goto endio; 336 } 337 /* if a second I/O region, start it */ 338 if (ucnt2) { 339 if ((rtape(adr2, ucnt2) == ERROR) && 340 (wtsense(TP_WRP) == ERROR)) 341 ucnt2 = 0; /* don't poll for me */ 342 } 343 344 /* if second i/o pending wait for it */ 345 if (ucnt2) { 346 pollrdy(); 347 /* whether pollrdy is ok or not */ 348 finished += bytes; 349 } 350 } else { 351 if (wtflags & TPWP) /* write protected */ 352 goto errxit; 353 354 /* If write command outstanding, just skip down */ 355 if (!(wtflags & TPWO)) { 356 if (ERROR == wtsense(0)) /* clear status */ 357 { 358 #ifdef DEBUG 359 debug("TPstart: sense 0\n"); 360 #endif 361 goto errxit; 362 } 363 if (!(wtflags & TPWRITE) || (wtflags & TPRANY) || 364 (wstart() == ERROR)) { 365 #ifdef DEBUG 366 debug("Tpstart: write init error\n"); /* */ 367 #endif 368 wtsense(0); 369 370 errxit: bp->b_flags |= B_ERROR; 371 bp->b_resid = bp->b_bcount; 372 goto xit; 373 } 374 wtflags |= TPWO|TPWANY; 375 } 376 377 /* and hold your nose */ 378 if (ucnt1 && ((wtape(adr1, ucnt1) == ERROR) 379 && (wtsense(0) == ERROR))) 380 finished = bytes; 381 382 else if (ucnt2 && 383 (((ucnt1 && pollrdy()) || 384 (wtape(adr2, ucnt2) == ERROR)) && 385 (wtsense(0) == ERROR))) 386 finished = ucnt1 + NBPS + bytes; 387 /* All writes and/or copyins were fine! */ 388 else 389 finished = bp->b_bcount; 390 bad = pollrdy(); 391 } 392 393 endio: 394 if(bad == EIO) bad = 0; 395 wterror.wt_err = 0; 396 if (exflag && wtsense((bp->b_flags & B_READ) ? TP_WRP : 0)) { 397 if ((wterror.wt_err & TP_ST0) 398 && (wterror.wt_err & (TP_FIL|TP_EOM))) { 399 #ifdef DEBUG 400 debug("WTsta: Hit end of tape\n"); /* */ 401 #endif 402 wtflags |= TPVOL; 403 if (wterror.wt_err & TP_FIL) { 404 if (wtflags & TPRO) 405 /* interrupter is bogus */ 406 rstart(); /* restart read command */ 407 else 408 wtflags &= ~TPWO; 409 finished += NBPS; 410 } 411 /* Reading file marks or writing end of tape return 0 bytes */ 412 } else { 413 bp->b_flags |= B_ERROR; 414 wtflags &= ~(TPWO|TPRO); 415 } 416 } 417 418 if(bad) { 419 bp->b_flags |= B_ERROR; 420 bp->b_error = bad; 421 } 422 bp->b_resid = bp->b_bcount - finished; 423 xit: 424 biodone(bp); 425 if (wtimeron) 426 Hogtime = lbolt; 427 else if (Hogproc == myproc) 428 Hogproc = (struct proc *) 0; 429 } 430 431 /* 432 * simulate an interrupt periodically while I/O is going 433 * this is necessary in case interrupts get eaten due to 434 * multiple devices on a single IRQ line 435 */ 436 wtimer() 437 { 438 /* If I/O going and not in isr(), simulate interrupt 439 * If no I/O for at least 1 second, stop being a Hog 440 * If I/O done and not a Hog, turn off wtimer() 441 */ 442 if (wtio && !isrlock) 443 isr(); 444 445 if ((Hogproc == myproc) && Hogtime && (lbolt-Hogtime > HZ)) 446 Hogproc = (struct proc *) 0; 447 448 if (wtio || (Hogproc == myproc)) 449 timeout(wtimer, (caddr_t) 0, HZ); 450 else 451 wtimeron = 0; 452 } 453 454 455 wtrawio(bp) 456 struct buf *bp; 457 { 458 wtstrategy(bp); 459 biowait(bp); 460 return(0); 461 } 462 463 wt_minphys(bp) 464 struct buf *bp; 465 { 466 if (bp->b_bcount > PAGESIZ) 467 bp->b_bcount = PAGESIZ; 468 } 469 470 /* 471 * raw read routine 472 */ 473 wtread(dev, uio) 474 struct uio *uio; 475 { 476 if (wtflags & TPSESS) { 477 return(EIO); 478 } 479 physio(wtrawio, &rwtbuf, dev, B_READ, wt_minphys, uio); 480 return(0); 481 } 482 483 /* 484 * raw write routine 485 */ 486 wtwrite(dev, uio) 487 struct uio *uio; 488 { 489 if (wtflags & TPSESS) { 490 return(EIO); 491 } 492 physio(wtrawio, &rwtbuf, dev, B_WRITE, wt_minphys, uio); 493 return(0); 494 } 495 496 497 498 /* 499 * ioctl routine 500 * for user level QIC commands only 501 */ 502 wtioctl(dev, cmd, arg, mode) 503 int dev, cmd; 504 unsigned long arg; 505 int mode; 506 { 507 if (cmd == WTQICMD) 508 { 509 if ((qicmd((int)arg) == ERROR) || (rdyexc(HZ) == ERROR)) 510 { 511 wtsense(0); 512 return(EIO); 513 } 514 return(0); 515 } 516 return(EINVAL); 517 } 518 519 /* 520 * open routine 521 * called on every device open 522 */ 523 wtopen(dev, flag) 524 int dev, flag; 525 { 526 if (first_wtopen_ever) { 527 wtinit(); 528 first_wtopen_ever = 0; 529 } 530 #ifdef DEBUG 531 printf("wtopen ...\n"); 532 #endif 533 if (!pageaddr) { 534 return(ENXIO); 535 } 536 if (wtflags & (TPINUSE)) { 537 return(ENXIO); 538 } 539 if (wtflags & (TPDEAD)) { 540 return(EIO); 541 } 542 /* If a rewind from the last session is going on, wait */ 543 while(wtflags & TPREW) { 544 #ifdef DEBUG 545 debug("Waiting for rew to finish\n"); 546 #endif 547 delay(1000000); /* delay one second */ 548 } 549 /* Only do reset and select when tape light is off, and tape is rewound. 550 * This allows multiple volumes. */ 551 if (wtflags & TPSTART) { 552 if (t_reset() != SUCCESS) { 553 return(ENXIO); 554 } 555 #ifdef DEBUG 556 debug("reset done. calling wtsense\n"); 557 #endif 558 if (wtsense(TP_WRP) == ERROR) { 559 return (EIO); 560 } 561 #ifdef DEBUG 562 debug("wtsense done\n"); 563 #endif 564 wtflags &= ~TPSTART; 565 } 566 567 wtflags = TPINUSE; 568 if (flag & FREAD) 569 wtflags |= TPREAD; 570 if (flag & FWRITE) 571 wtflags |= TPWRITE; 572 rwtbuf.b_flags = 0; 573 myproc = curproc; /* for comparison */ 574 switch(TP_DENS(dev)) { 575 case 0: 576 cmds(0x28); 577 break; 578 case 1: 579 cmds(0x29); 580 break; 581 case 2: 582 cmds(0x27); 583 break; 584 case 3: 585 cmds(0x24); 586 } 587 return(0); 588 } 589 590 /* 591 * close routine 592 * called on last device close 593 * If not rewind-on-close, leave read or write command intact. 594 */ 595 wtclose(dev) 596 { 597 int wtdsl2(); 598 599 #ifdef DEBUG 600 debug("WTclose:\n"); 601 #endif 602 if (Hogproc == myproc) 603 Hogproc = (struct proc *) 0; 604 if (!exflag && (wtflags & TPWANY) && !(wtflags & (TPSESS|TPDEAD))) { 605 if (!(wtflags & TPWO)) 606 wstart(); 607 #ifdef DEBUG 608 debug("WT: Writing file mark\n"); 609 #endif 610 wmark(); /* write file mark */ 611 #ifdef DEBUG 612 debug("WT: Wrote file mark, going to wait\n"); 613 #endif 614 if (rdyexc(HZ/10) == ERROR) { 615 wtsense(0); 616 } 617 } 618 if (TP_REWCLOSE(dev) || (wtflags & (TPSESS|TPDEAD))) { 619 /* rewind tape to beginning of tape, deselect tape, and make a note */ 620 /* don't wait until rewind, though */ 621 /* Ending read or write causes rewind to happen, if no error, 622 * and READY and EXCEPTION stay up until it finishes */ 623 if (wtflags & (TPRO|TPWO)) 624 { 625 #ifdef DEBUG 626 debug("End read or write\n"); 627 #endif 628 rdyexc(HZ/10); 629 ioend(); 630 wtflags &= ~(TPRO|TPWO); 631 } 632 else wtwind(); 633 wtflags |= TPSTART | TPREW; 634 timeout(wtdsl2, 0, HZ); 635 } 636 else if (!(wtflags & (TPVOL|TPWANY))) 637 { 638 /* space forward to after next file mark no writing done */ 639 /* This allows skipping data without reading it.*/ 640 #ifdef DEBUG 641 debug("Reading past file mark\n"); 642 #endif 643 if (!(wtflags & TPRO)) 644 rstart(); 645 rmark(); 646 if (rdyexc(HZ/10)) 647 { 648 wtsense(TP_WRP); 649 } 650 } 651 wtflags &= TPREW|TPDEAD|TPSTART|TPRO|TPWO; 652 return(0); 653 } 654 655 /* return ERROR if user I/O request should receive an I/O error code */ 656 657 wtsense(ignor) 658 { 659 wtflags &= ~(TPRO|TPWO); 660 #ifdef DEBUGx 661 debug("WTsense: start "); 662 #endif 663 if (rdstatus(&wterror) == ERROR) 664 { 665 #ifdef DEBUG 666 debug("WTsense: Can't read status\n"); 667 #endif 668 return(ERROR); 669 } 670 #ifdef DEBUG 671 if (wterror.wt_err & (TP_ST0|TP_ST1)) 672 { 673 debug("Tperror: status %x error %d underruns %d\n", 674 wterror.wt_err, wterror.wt_ercnt, wterror.wt_urcnt); 675 } 676 else 677 debug("done. no error\n"); 678 #endif 679 wterror.wt_err &= ~ignor; /* ignore certain errors */ 680 reperr(wterror.wt_err); 681 if (((wterror.wt_err & TP_ST0) && (wterror.wt_err & TP_ERR0)) || 682 ((wterror.wt_err & TP_ST1) && (wterror.wt_err & TP_ERR1))) 683 return ERROR; 684 685 return SUCCESS; 686 } 687 688 /* lifted from tdriver.c from Wangtek */ 689 reperr(srb0) 690 int srb0; 691 { 692 int s0 = srb0 & (TP_ERR0|TP_ERR1); /* find out which exception to report */ 693 694 if (s0) { 695 if (s0 & TP_USL) 696 sterr("Drive not online"); 697 else if (s0 & TP_CNI) 698 sterr("No cartridge"); 699 else if ((s0 & TP_WRP) && !(wtflags & TPWP)) 700 { 701 sterr("Tape is write protected"); 702 wtflags |= TPWP; 703 } 704 /* 705 if (s0 & TP_FIL) 706 sterr("Filemark detected"); 707 */ 708 else if (s0 & TP_BNL) 709 sterr("Block in error not located"); 710 else if (s0 & TP_UDA) 711 sterr("Unrecoverable data error"); 712 /* 713 else if (s0 & TP_EOM) 714 sterr("End of tape"); 715 */ 716 else if (s0 & TP_NDT) 717 sterr("No data detected"); 718 /* 719 if (s0 & TP_POR) 720 sterr("Reset occured"); 721 */ 722 else if (s0 & TP_BOM) 723 sterr("Beginning of tape"); 724 else if (s0 & TP_ILL) 725 sterr("Illegal command"); 726 } 727 } 728 729 sterr(errstr) 730 char *errstr; 731 { 732 printf("Streamer: %s\n", errstr); 733 } 734 735 /* Wait until rewind finishes, and deselect drive */ 736 wtdsl2() { 737 int stat; 738 739 stat = inb(wtport) & (READY|EXCEP); 740 #ifdef DEBUG 741 debug("Timeout: Waiting for rewind to finish: stat %x\n", stat); 742 #endif 743 switch (stat) { 744 /* They're active low, ya'know */ 745 case READY|EXCEP: 746 timeout(wtdsl2, (caddr_t) 0, HZ); 747 return; 748 case EXCEP: 749 wtflags &= ~TPREW; 750 return; 751 case READY: 752 case 0: 753 wtflags &= ~TPREW; 754 sterr("Rewind failed"); 755 wtsense(TP_WRP); 756 return; 757 } 758 } 759 760 wtwind() { 761 #ifdef DEBUG 762 debug("WT: About to rewind\n"); 763 #endif 764 rwind(); /* actually start rewind */ 765 } 766 767 wtintr(unit) { 768 if (wtflags & (TPWO|TPRO)) 769 { 770 isrlock = 1; 771 if (wtio) isr(); 772 isrlock = 0; 773 } 774 } 775 776 wtinit() { 777 if (wtchan < 1 || wtchan > 3) 778 { 779 sterr("Bad DMA channel, cannot init driver"); 780 return; 781 } 782 wtlinit(); /* init assembly language variables */ 783 pageset(); 784 } 785 786 rdyexc(ticks) 787 { 788 int s; 789 #ifdef DEBUG 790 int os = 0xffff; /* force printout first time */ 791 #endif 792 for (;;) { /* loop until ready or exception */ 793 s=(inb(wtport) & 0xff); /* read the status register */ 794 #ifdef DEBUG 795 if (os != s) { 796 debug("Status reg = %x\n", s); /* */ 797 os = s; 798 } 799 #endif 800 if (!(s & EXCEP)) /* check if exception have occured */ 801 break; 802 if (!(s & READY)) /* check if controller is ready */ 803 break; 804 s = splbio(); 805 delay((ticks/HZ)*1000000); /* */ 806 splx(s); 807 } 808 #ifdef DEBUG 809 debug("Status reg = %x on return\n", s); /* */ 810 #endif 811 return((s & EXCEP)?SUCCESS:ERROR); /* return exception if it occured */ 812 } 813 814 pollrdy() 815 { 816 int sps; 817 #ifdef DEBUG 818 debug("Pollrdy\n"); 819 #endif 820 sps = splbio(); 821 while (wtio) { 822 int error; 823 824 if (error = tsleep((caddr_t)&wci, WTPRI | PCATCH, 825 "wtpoll", 0)) { 826 splx(sps); 827 return(error); 828 } 829 } 830 splx(sps); 831 #ifdef DEBUG 832 debug("Finish poll, wci %d exflag %d\n", wci, exflag); 833 #endif 834 return (EIO); 835 } 836 837 wtdma() /* start up i/o operation, called from dma() in wtlib1.s */ 838 { 839 wtio = 1; 840 if (!wtimeron) 841 { 842 wtimeron = 1; 843 timeout(wtimer, (caddr_t) 0, HZ/2); 844 } 845 } 846 847 wtwake() /* end i/o operation, called from isr() in wtlib1.s */ 848 { 849 wtio = 0; 850 wakeup(&wci); 851 } 852 853 pageset() 854 { 855 unsigned long pp; 856 857 pp = (unsigned long) pagebuf; 858 pageaddr = kvtop(pp); 859 #ifdef DEBUG 860 debug("pageset: addr %lx\n", pageaddr); 861 #endif 862 } 863 864 865 866 #define near 867 868 static near 869 sendcmd() 870 { 871 /* desired command in global mbits */ 872 873 outb(CTLPORT, mbits | REQUEST); /* set request */ 874 while (inb(STATPORT) & READY); /* wait for ready */ 875 outb(CTLPORT, mbits & ~REQUEST); /* reset request */ 876 while ((inb(STATPORT) & READY) == 0); /* wait for not ready */ 877 } 878 879 static near /* execute command */ 880 cmds(cmd) 881 { 882 register s; 883 884 do s = inb(STATPORT); 885 while ((s & STAT) == STAT); /* wait for ready */ 886 887 if ((s & EXCEP) == 0) /* if exception */ 888 return ERROR; /* error */ 889 890 outb(CMDPORT, cmd); /* output the command */ 891 892 outb(CTLPORT, mbits=ONLINE); /* set & send ONLINE */ 893 sendcmd(); 894 895 return SUCCESS; 896 } 897 898 qicmd(cmd) 899 { 900 return cmds(cmd); 901 } 902 903 rstart() 904 { 905 return cmds(RDDATA); 906 } 907 908 rmark() 909 { 910 return cmds(READFM); 911 } 912 913 wstart() 914 { 915 return cmds(WRTDATA); 916 } 917 918 ioend() 919 { 920 register s; 921 register rval = SUCCESS; 922 923 do s = inb(STATPORT); 924 while ((s & STAT) == STAT); /* wait for ready */ 925 926 if ((s & EXCEP) == 0) /* if exception */ 927 rval = ERROR; /* error */ 928 929 mbits &= ~ONLINE; 930 outb(CTLPORT, mbits); /* reset ONLINE */ 931 outb(MASKREG, wtchan+4); /* turn off dma */ 932 outb(CLEARFF, 0); /* reset direction flag */ 933 934 return rval; 935 } 936 937 wmark() 938 { 939 register s; 940 941 if (cmds(WRITEFM) == ERROR) 942 return ERROR; 943 944 do s = inb(STATPORT); 945 while ((s & STAT) == STAT); /* wait for ready */ 946 947 if ((s & EXCEP) == 0) /* if exception */ 948 return ERROR; /* error */ 949 950 return SUCCESS; 951 } 952 953 rwind() 954 { 955 register s; 956 957 mbits = CMDOFF; 958 959 do s = inb(STATPORT); 960 while ((s & STAT) == STAT); /* wait for ready */ 961 962 outb(CMDPORT, REWIND); 963 sendcmd(); 964 965 return SUCCESS; 966 } 967 968 rdstatus(stp) 969 char *stp; /* pointer to 6 byte buffer */ 970 { 971 register s; 972 int n; 973 974 do s = inb(STATPORT); 975 while ((s & STAT) == STAT); /* wait for ready or exception */ 976 977 outb(CMDPORT, RDSTAT); 978 sendcmd(); /* send read status command */ 979 980 for (n=0; n<6; n++) 981 { 982 #ifdef DEBUGx 983 debug("rdstatus: waiting, byte %d\n", n); 984 #endif 985 do s = inb(STATPORT); 986 while ((s & STAT) == STAT); /* wait for ready */ 987 #ifdef DEBUGx 988 debug("rdstatus: done\n"); 989 #endif 990 if ((s & EXCEP) == 0) /* if exception */ 991 return ERROR; /* error */ 992 993 *stp++ = inb(DATAPORT); /* read status byte */ 994 995 outb(CTLPORT, mbits | REQUEST); /* set request */ 996 #ifdef DEBUGx 997 debug("rdstatus: waiting after request, byte %d\n", n); 998 #endif 999 while ((inb(STATPORT)&READY) == 0); /* wait for not ready */ 1000 for (s=100; s>0; s--); /* wait an additional time */ 1001 1002 outb(CTLPORT, mbits & ~REQUEST);/* unset request */ 1003 #ifdef DEBUGx 1004 debug("rdstatus: done\n"); 1005 #endif 1006 } 1007 return SUCCESS; 1008 } 1009 1010 t_reset() 1011 { 1012 register i; 1013 mbits |= RESET; 1014 outb(CTLPORT, mbits); /* send reset */ 1015 delay(20); 1016 mbits &= ~RESET; 1017 outb(CTLPORT, mbits); /* turn off reset */ 1018 if ((inb(STATPORT) & RESETMASK) == RESETVAL) 1019 return SUCCESS; 1020 return ERROR; 1021 } 1022 1023 static 1024 dma() 1025 { 1026 int x=splbio(); 1027 wtdma(); 1028 outb(CLEARFF, 0); 1029 outb(MODEREG, mode); /* set dma mode */ 1030 outb(dmareg, bufptr & 0xFF); 1031 outb(dmareg, (bufptr>>8) & 0xFF); 1032 outb(pagereg, (bufptr>>16) & 0xFF); 1033 outb(dmareg+1, (BLKSIZE-1) & 0xFF); 1034 outb(dmareg+1, (BLKSIZE-1) >> 8); 1035 outb(wtport, eqdma+ONLINE); 1036 outb(MASKREG, wtchan); /* enable command to 8237, start dma */ 1037 splx(x); 1038 } 1039 1040 static near 1041 wtstart(buf, cnt) 1042 long buf; 1043 int cnt; 1044 { 1045 register s; 1046 1047 bufptr = buf; /* init statics */ 1048 numbytes = cnt; 1049 wci = 0; /* init flags */ 1050 exflag = 0; 1051 bytes = 0; /* init counter */ 1052 1053 do s = inb(STATPORT) & STAT; 1054 while (s == STAT); /* wait for ready or error */ 1055 1056 if (s & EXCEP) /* no error */ 1057 { 1058 dma(); 1059 return SUCCESS; 1060 } 1061 return ERROR; /* error */ 1062 } 1063 1064 rtape(buf, cnt) 1065 long buf; /* physical address */ 1066 int cnt; /* number of bytes */ 1067 { 1068 mode = dma_read; 1069 return wtstart(buf,cnt); 1070 } 1071 1072 wtape(buf, cnt) 1073 long buf; /* physical address */ 1074 int cnt; /* number of bytes */ 1075 { 1076 mode = dma_write; 1077 return wtstart(buf,cnt); 1078 } 1079 1080 isr() 1081 { 1082 int stat = inb(wtport); 1083 if (!(stat & EXCEP)) /* exception during I/O */ 1084 { 1085 if (bytes + BLKSIZE >= numbytes) wci = 1; 1086 exflag = 1; 1087 goto isrwake; 1088 } 1089 if ((stat & READY) || !(inb(STATUSREG) & dma_done)) 1090 return; 1091 exflag = 0; 1092 outb(wtport, ONLINE); 1093 bytes += BLKSIZE; 1094 if (bytes >= numbytes) /* normal completion of I/O */ 1095 { 1096 wci = 1; 1097 isrwake: 1098 outb(MASKREG, 4+wtchan); /* turn off dma */ 1099 wtwake(); /* wake up user level */ 1100 } 1101 else 1102 { /* continue I/O */ 1103 bufptr += BLKSIZE; 1104 dma(); 1105 } 1106 } 1107 1108 wtlinit() 1109 { 1110 switch (wtchan) { 1111 case 1: 1112 return; 1113 case 2: 1114 pagereg = 0x81; 1115 dma_done = 4; 1116 break; 1117 case 3: 1118 eqdma = 0x10; 1119 pagereg = 0x82; 1120 dma_done = 8; 1121 break; 1122 } 1123 dma_write = wtchan+0x48; 1124 dma_read = wtchan+0x44; 1125 dmareg = wtchan+wtchan; 1126 } 1127 1128 /* 1129 * delay i microseconds 1130 */ 1131 delay(i) 1132 register int i; 1133 { 1134 while (i-- > 0) 1135 DELAY(1000); 1136 } 1137 1138 wtsize() 1139 { 1140 } 1141 1142 wtdump() 1143 { 1144 } 1145 1146 #include "i386/isa/isa_device.h" 1147 #include "i386/isa/icu.h" 1148 1149 int wtprobe(), wtattach(); 1150 struct isa_driver wtdriver = { 1151 wtprobe, wtattach, "wt", 1152 }; 1153 1154 wtprobe(dvp) 1155 struct isa_device *dvp; 1156 { 1157 int val,i,s; 1158 1159 #ifdef lint 1160 wtintr(0); 1161 #endif 1162 1163 wtport = dvp->id_iobase; 1164 if(t_reset() != SUCCESS) return(0); 1165 return(1); 1166 } 1167 1168 wtattach() { } 1169 1170 #endif NWT 1171