1 /*- 2 * Copyright (c) 1997 Poul-Henning Kamp 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 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * From Id: lpt.c,v 1.55.2.1 1996/11/12 09:08:38 phk Exp 27 * $FreeBSD: src/sys/dev/ppbus/if_plip.c,v 1.19.2.1 2000/05/24 00:20:57 n_hibma Exp $ 28 */ 29 30 /* 31 * Parallel port TCP/IP interfaces added. I looked at the driver from 32 * MACH but this is a complete rewrite, and btw. incompatible, and it 33 * should perform better too. I have never run the MACH driver though. 34 * 35 * This driver sends two bytes (0x08, 0x00) in front of each packet, 36 * to allow us to distinguish another format later. 37 * 38 * Now added an Linux/Crynwr compatibility mode which is enabled using 39 * IF_LINK0 - Tim Wilkinson. 40 * 41 * TODO: 42 * Make HDLC/PPP mode, use IF_LLC1 to enable. 43 * 44 * Connect the two computers using a Laplink parallel cable to use this 45 * feature: 46 * 47 * +----------------------------------------+ 48 * |A-name A-End B-End Descr. Port/Bit | 49 * +----------------------------------------+ 50 * |DATA0 2 15 Data 0/0x01 | 51 * |-ERROR 15 2 1/0x08 | 52 * +----------------------------------------+ 53 * |DATA1 3 13 Data 0/0x02 | 54 * |+SLCT 13 3 1/0x10 | 55 * +----------------------------------------+ 56 * |DATA2 4 12 Data 0/0x04 | 57 * |+PE 12 4 1/0x20 | 58 * +----------------------------------------+ 59 * |DATA3 5 10 Strobe 0/0x08 | 60 * |-ACK 10 5 1/0x40 | 61 * +----------------------------------------+ 62 * |DATA4 6 11 Data 0/0x10 | 63 * |BUSY 11 6 1/~0x80 | 64 * +----------------------------------------+ 65 * |GND 18-25 18-25 GND - | 66 * +----------------------------------------+ 67 * 68 * Expect transfer-rates up to 75 kbyte/sec. 69 * 70 * If GCC could correctly grok 71 * register int port asm("edx") 72 * the code would be cleaner 73 * 74 * Poul-Henning Kamp <phk@freebsd.org> 75 */ 76 77 /* 78 * Update for ppbus, PLIP support only - Nicolas Souchu 79 */ 80 81 #include "opt_plip.h" 82 83 #include <sys/param.h> 84 #include <sys/systm.h> 85 #include <sys/module.h> 86 #include <sys/bus.h> 87 #include <sys/mbuf.h> 88 #include <sys/socket.h> 89 #include <sys/sockio.h> 90 #include <sys/kernel.h> 91 #include <sys/malloc.h> 92 #include <sys/rman.h> 93 #include <sys/thread2.h> 94 95 #include <machine/clock.h> 96 97 #include <net/if.h> 98 #include <net/ifq_var.h> 99 #include <net/if_types.h> 100 #include <net/netisr.h> 101 102 #include <netinet/in.h> 103 #include <netinet/in_var.h> 104 105 #include <net/bpf.h> 106 107 #include <bus/ppbus/ppbconf.h> 108 #include "ppbus_if.h" 109 #include <bus/ppbus/ppbio.h> 110 111 #ifndef LPMTU /* MTU for the lp# interfaces */ 112 #define LPMTU 1500 113 #endif 114 115 #ifndef LPMAXSPIN1 /* DELAY factor for the lp# interfaces */ 116 #define LPMAXSPIN1 8000 /* Spinning for remote intr to happen */ 117 #endif 118 119 #ifndef LPMAXSPIN2 /* DELAY factor for the lp# interfaces */ 120 #define LPMAXSPIN2 500 /* Spinning for remote handshake to happen */ 121 #endif 122 123 #ifndef LPMAXERRS /* Max errors before !RUNNING */ 124 #define LPMAXERRS 100 125 #endif 126 127 #define CLPIPHDRLEN 14 /* We send dummy ethernet addresses (two) + packet type in front of packet */ 128 #define CLPIP_SHAKE 0x80 /* This bit toggles between nibble reception */ 129 #define MLPIPHDRLEN CLPIPHDRLEN 130 131 #define LPIPHDRLEN 2 /* We send 0x08, 0x00 in front of packet */ 132 #define LPIP_SHAKE 0x40 /* This bit toggles between nibble reception */ 133 #if !defined(MLPIPHDRLEN) || LPIPHDRLEN > MLPIPHDRLEN 134 #define MLPIPHDRLEN LPIPHDRLEN 135 #endif 136 137 #define LPIPTBLSIZE 256 /* Size of octet translation table */ 138 139 #define lprintf if (lptflag) kprintf 140 141 #ifdef PLIP_DEBUG 142 static int volatile lptflag = 1; 143 #else 144 static int volatile lptflag = 0; 145 #endif 146 147 struct lp_data { 148 unsigned short lp_unit; 149 150 struct ifnet sc_if; 151 u_char *sc_ifbuf; 152 int sc_iferrs; 153 154 struct resource *res_irq; 155 }; 156 157 /* Tables for the lp# interface */ 158 static u_char *txmith; 159 #define txmitl (txmith+(1*LPIPTBLSIZE)) 160 #define trecvh (txmith+(2*LPIPTBLSIZE)) 161 #define trecvl (txmith+(3*LPIPTBLSIZE)) 162 163 static u_char *ctxmith; 164 #define ctxmitl (ctxmith+(1*LPIPTBLSIZE)) 165 #define ctrecvh (ctxmith+(2*LPIPTBLSIZE)) 166 #define ctrecvl (ctxmith+(3*LPIPTBLSIZE)) 167 168 /* Functions for the lp# interface */ 169 static int lpinittables(void); 170 static int lpioctl(struct ifnet *, u_long, caddr_t, struct ucred *); 171 static int lpoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 172 struct rtentry *); 173 static void lp_intr(void *); 174 175 #define DEVTOSOFTC(dev) \ 176 ((struct lp_data *)device_get_softc(dev)) 177 #define UNITOSOFTC(unit) \ 178 ((struct lp_data *)devclass_get_softc(lp_devclass, (unit))) 179 #define UNITODEVICE(unit) \ 180 (devclass_get_device(lp_devclass, (unit))) 181 182 static devclass_t lp_devclass; 183 184 /* 185 * lpprobe() 186 */ 187 static int 188 lp_probe(device_t dev) 189 { 190 device_t ppbus = device_get_parent(dev); 191 struct lp_data *lp; 192 int zero = 0; 193 uintptr_t irq; 194 195 lp = DEVTOSOFTC(dev); 196 197 /* retrieve the ppbus irq */ 198 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 199 200 /* if we haven't interrupts, the probe fails */ 201 if (irq == -1) { 202 device_printf(dev, "not an interrupt driven port, failed.\n"); 203 return (ENXIO); 204 } 205 206 /* reserve the interrupt resource, expecting irq is available to continue */ 207 lp->res_irq = bus_alloc_legacy_irq_resource(dev, &zero, irq, 208 RF_SHAREABLE); 209 if (lp->res_irq == 0) { 210 device_printf(dev, "cannot reserve interrupt, failed.\n"); 211 return (ENXIO); 212 } 213 214 /* 215 * lp dependent initialisation. 216 */ 217 lp->lp_unit = device_get_unit(dev); 218 219 device_set_desc(dev, "PLIP network interface"); 220 221 return (0); 222 } 223 224 static int 225 lp_attach (device_t dev) 226 { 227 struct lp_data *lp = DEVTOSOFTC(dev); 228 struct ifnet *ifp = &lp->sc_if; 229 230 ifp->if_softc = lp; 231 if_initname(ifp, "lp", device_get_unit(dev)); 232 ifp->if_mtu = LPMTU; 233 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST; 234 ifp->if_ioctl = lpioctl; 235 ifp->if_output = lpoutput; 236 ifp->if_type = IFT_PARA; 237 ifp->if_hdrlen = 0; 238 ifp->if_addrlen = 0; 239 ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN); 240 if_attach(ifp, NULL); 241 242 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 243 244 return (0); 245 } 246 /* 247 * Build the translation tables for the LPIP (BSD unix) protocol. 248 * We don't want to calculate these nasties in our tight loop, so we 249 * precalculate them when we initialize. 250 */ 251 static int 252 lpinittables (void) 253 { 254 int i; 255 256 if (!txmith) 257 txmith = kmalloc(4*LPIPTBLSIZE, M_DEVBUF, M_WAITOK); 258 259 if (!ctxmith) 260 ctxmith = kmalloc(4*LPIPTBLSIZE, M_DEVBUF, M_WAITOK); 261 262 for (i=0; i < LPIPTBLSIZE; i++) { 263 ctxmith[i] = (i & 0xF0) >> 4; 264 ctxmitl[i] = 0x10 | (i & 0x0F); 265 ctrecvh[i] = (i & 0x78) << 1; 266 ctrecvl[i] = (i & 0x78) >> 3; 267 } 268 269 for (i=0; i < LPIPTBLSIZE; i++) { 270 txmith[i] = ((i & 0x80) >> 3) | ((i & 0x70) >> 4) | 0x08; 271 txmitl[i] = ((i & 0x08) << 1) | (i & 0x07); 272 trecvh[i] = ((~i) & 0x80) | ((i & 0x38) << 1); 273 trecvl[i] = (((~i) & 0x80) >> 4) | ((i & 0x38) >> 3); 274 } 275 276 return 0; 277 } 278 279 /* 280 * Process an ioctl request. 281 */ 282 283 static int 284 lpioctl (struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) 285 { 286 device_t dev = UNITODEVICE(ifp->if_dunit); 287 device_t ppbus = device_get_parent(dev); 288 struct lp_data *sc = DEVTOSOFTC(dev); 289 struct ifaddr *ifa = (struct ifaddr *)data; 290 struct ifreq *ifr = (struct ifreq *)data; 291 u_char *ptr; 292 void *ih; 293 int error; 294 295 switch (cmd) { 296 297 case SIOCSIFDSTADDR: 298 case SIOCAIFADDR: 299 case SIOCSIFADDR: 300 if (ifa->ifa_addr->sa_family != AF_INET) 301 return EAFNOSUPPORT; 302 303 ifp->if_flags |= IFF_UP; 304 /* FALLTHROUGH */ 305 case SIOCSIFFLAGS: 306 if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) { 307 308 ppb_wctr(ppbus, 0x00); 309 ifp->if_flags &= ~IFF_RUNNING; 310 311 /* IFF_UP is not set, try to release the bus anyway */ 312 ppb_release_bus(ppbus, dev); 313 break; 314 } 315 if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) { 316 317 /* XXX 318 * Should the request be interruptible? 319 */ 320 if ((error = ppb_request_bus(ppbus, dev, PPB_WAIT|PPB_INTR))) 321 return (error); 322 323 /* Now IFF_UP means that we own the bus */ 324 325 ppb_set_mode(ppbus, PPB_COMPATIBLE); 326 327 if (lpinittables()) { 328 ppb_release_bus(ppbus, dev); 329 return ENOBUFS; 330 } 331 332 sc->sc_ifbuf = kmalloc(sc->sc_if.if_mtu + MLPIPHDRLEN, 333 M_DEVBUF, M_WAITOK); 334 335 /* attach our interrupt handler, later detached when the bus is released */ 336 error = BUS_SETUP_INTR(ppbus, dev, sc->res_irq, 0, 337 lp_intr, dev, &ih, NULL); 338 if (error) { 339 ppb_release_bus(ppbus, dev); 340 return (error); 341 } 342 343 ppb_wctr(ppbus, IRQENABLE); 344 ifp->if_flags |= IFF_RUNNING; 345 } 346 break; 347 348 case SIOCSIFMTU: 349 ptr = sc->sc_ifbuf; 350 sc->sc_ifbuf = kmalloc(ifr->ifr_mtu+MLPIPHDRLEN, M_DEVBUF, M_WAITOK); 351 if (ptr) 352 kfree(ptr,M_DEVBUF); 353 sc->sc_if.if_mtu = ifr->ifr_mtu; 354 break; 355 356 case SIOCGIFMTU: 357 ifr->ifr_mtu = sc->sc_if.if_mtu; 358 break; 359 360 case SIOCADDMULTI: 361 case SIOCDELMULTI: 362 if (ifr == 0) { 363 return EAFNOSUPPORT; /* XXX */ 364 } 365 switch (ifr->ifr_addr.sa_family) { 366 367 case AF_INET: 368 break; 369 370 default: 371 return EAFNOSUPPORT; 372 } 373 break; 374 375 case SIOCGIFMEDIA: 376 /* 377 * No ifmedia support at this stage; maybe use it 378 * in future for eg. protocol selection. 379 */ 380 return EINVAL; 381 382 default: 383 lprintf("LP:ioctl(0x%lx)\n", cmd); 384 return EINVAL; 385 } 386 return 0; 387 } 388 389 static __inline int 390 clpoutbyte (u_char byte, int spin, device_t ppbus) 391 { 392 ppb_wdtr(ppbus, ctxmitl[byte]); 393 while (ppb_rstr(ppbus) & CLPIP_SHAKE) 394 if (--spin == 0) { 395 return 1; 396 } 397 ppb_wdtr(ppbus, ctxmith[byte]); 398 while (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) 399 if (--spin == 0) { 400 return 1; 401 } 402 return 0; 403 } 404 405 static __inline int 406 clpinbyte (int spin, device_t ppbus) 407 { 408 u_char c, cl; 409 410 while((ppb_rstr(ppbus) & CLPIP_SHAKE)) 411 if(!--spin) { 412 return -1; 413 } 414 cl = ppb_rstr(ppbus); 415 ppb_wdtr(ppbus, 0x10); 416 417 while(!(ppb_rstr(ppbus) & CLPIP_SHAKE)) 418 if(!--spin) { 419 return -1; 420 } 421 c = ppb_rstr(ppbus); 422 ppb_wdtr(ppbus, 0x00); 423 424 return (ctrecvl[cl] | ctrecvh[c]); 425 } 426 427 static void 428 lptap(struct ifnet *ifp, struct mbuf *m) 429 { 430 /* 431 * We need to prepend the address family as a four byte field. 432 */ 433 static const uint32_t af = AF_INET; 434 435 if (ifp->if_bpf) 436 bpf_ptap(ifp->if_bpf, m, &af, sizeof(af)); 437 } 438 439 static void 440 lp_intr (void *arg) 441 { 442 device_t dev = (device_t)arg; 443 device_t ppbus = device_get_parent(dev); 444 struct lp_data *sc = DEVTOSOFTC(dev); 445 int len, j; 446 u_char *bp; 447 u_char c, cl; 448 struct mbuf *top; 449 450 crit_enter(); 451 452 if (sc->sc_if.if_flags & IFF_LINK0) { 453 454 /* Ack. the request */ 455 ppb_wdtr(ppbus, 0x01); 456 457 /* Get the packet length */ 458 j = clpinbyte(LPMAXSPIN2, ppbus); 459 if (j == -1) 460 goto err; 461 len = j; 462 j = clpinbyte(LPMAXSPIN2, ppbus); 463 if (j == -1) 464 goto err; 465 len = len + (j << 8); 466 if (len > sc->sc_if.if_mtu + MLPIPHDRLEN) 467 goto err; 468 469 bp = sc->sc_ifbuf; 470 471 while (len--) { 472 j = clpinbyte(LPMAXSPIN2, ppbus); 473 if (j == -1) { 474 goto err; 475 } 476 *bp++ = j; 477 } 478 /* Get and ignore checksum */ 479 j = clpinbyte(LPMAXSPIN2, ppbus); 480 if (j == -1) { 481 goto err; 482 } 483 484 len = bp - sc->sc_ifbuf; 485 if (len <= CLPIPHDRLEN) 486 goto err; 487 488 sc->sc_iferrs = 0; 489 490 len -= CLPIPHDRLEN; 491 sc->sc_if.if_ipackets++; 492 sc->sc_if.if_ibytes += len; 493 top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, &sc->sc_if, 0); 494 if (top) { 495 if (sc->sc_if.if_bpf) 496 lptap(&sc->sc_if, top); 497 netisr_queue(NETISR_IP, top); 498 } 499 goto done; 500 } 501 while ((ppb_rstr(ppbus) & LPIP_SHAKE)) { 502 len = sc->sc_if.if_mtu + LPIPHDRLEN; 503 bp = sc->sc_ifbuf; 504 while (len--) { 505 506 cl = ppb_rstr(ppbus); 507 ppb_wdtr(ppbus, 8); 508 509 j = LPMAXSPIN2; 510 while((ppb_rstr(ppbus) & LPIP_SHAKE)) 511 if(!--j) goto err; 512 513 c = ppb_rstr(ppbus); 514 ppb_wdtr(ppbus, 0); 515 516 *bp++= trecvh[cl] | trecvl[c]; 517 518 j = LPMAXSPIN2; 519 while (!((cl=ppb_rstr(ppbus)) & LPIP_SHAKE)) { 520 if (cl != c && 521 (((cl = ppb_rstr(ppbus)) ^ 0xb8) & 0xf8) == 522 (c & 0xf8)) 523 goto end; 524 if (!--j) goto err; 525 } 526 } 527 528 end: 529 len = bp - sc->sc_ifbuf; 530 if (len <= LPIPHDRLEN) 531 goto err; 532 533 sc->sc_iferrs = 0; 534 535 len -= LPIPHDRLEN; 536 sc->sc_if.if_ipackets++; 537 sc->sc_if.if_ibytes += len; 538 top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, &sc->sc_if, 0); 539 if (top) { 540 if (sc->sc_if.if_bpf) 541 lptap(&sc->sc_if, top); 542 netisr_queue(NETISR_IP, top); 543 } 544 } 545 goto done; 546 547 err: 548 ppb_wdtr(ppbus, 0); 549 lprintf("R"); 550 sc->sc_if.if_ierrors++; 551 sc->sc_iferrs++; 552 553 /* 554 * We are not able to send receive anything for now, 555 * so stop wasting our time 556 */ 557 if (sc->sc_iferrs > LPMAXERRS) { 558 kprintf("lp%d: Too many errors, Going off-line.\n", device_get_unit(dev)); 559 ppb_wctr(ppbus, 0x00); 560 sc->sc_if.if_flags &= ~IFF_RUNNING; 561 sc->sc_iferrs=0; 562 } 563 564 done: 565 crit_exit(); 566 return; 567 } 568 569 static __inline int 570 lpoutbyte (u_char byte, int spin, device_t ppbus) 571 { 572 ppb_wdtr(ppbus, txmith[byte]); 573 while (!(ppb_rstr(ppbus) & LPIP_SHAKE)) 574 if (--spin == 0) 575 return 1; 576 ppb_wdtr(ppbus, txmitl[byte]); 577 while (ppb_rstr(ppbus) & LPIP_SHAKE) 578 if (--spin == 0) 579 return 1; 580 return 0; 581 } 582 583 static int 584 lpoutput (struct ifnet *ifp, struct mbuf *m, 585 struct sockaddr *dst, struct rtentry *rt) 586 { 587 device_t dev = UNITODEVICE(ifp->if_dunit); 588 device_t ppbus = device_get_parent(dev); 589 int err; 590 struct mbuf *mm; 591 u_char *cp = "\0\0"; 592 u_char chksum = 0; 593 int count = 0; 594 int i, len, spin; 595 596 /* We need a sensible value if we abort */ 597 cp++; 598 ifp->if_flags |= IFF_RUNNING; 599 600 err = 1; /* assume we're aborting because of an error */ 601 602 crit_enter(); 603 604 /* Suspend (on laptops) or receive-errors might have taken us offline */ 605 ppb_wctr(ppbus, IRQENABLE); 606 607 if (ifp->if_flags & IFF_LINK0) { 608 609 if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) { 610 lprintf("&"); 611 lp_intr(dev); 612 } 613 614 /* Alert other end to pending packet */ 615 spin = LPMAXSPIN1; 616 ppb_wdtr(ppbus, 0x08); 617 while ((ppb_rstr(ppbus) & 0x08) == 0) 618 if (--spin == 0) { 619 goto nend; 620 } 621 622 /* Calculate length of packet, then send that */ 623 624 count += 14; /* Ethernet header len */ 625 626 mm = m; 627 for (mm = m; mm; mm = mm->m_next) { 628 count += mm->m_len; 629 } 630 if (clpoutbyte(count & 0xFF, LPMAXSPIN1, ppbus)) 631 goto nend; 632 if (clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, ppbus)) 633 goto nend; 634 635 /* Send dummy ethernet header */ 636 for (i = 0; i < 12; i++) { 637 if (clpoutbyte(i, LPMAXSPIN1, ppbus)) 638 goto nend; 639 chksum += i; 640 } 641 642 if (clpoutbyte(0x08, LPMAXSPIN1, ppbus)) 643 goto nend; 644 if (clpoutbyte(0x00, LPMAXSPIN1, ppbus)) 645 goto nend; 646 chksum += 0x08 + 0x00; /* Add into checksum */ 647 648 mm = m; 649 do { 650 cp = mtod(mm, u_char *); 651 len = mm->m_len; 652 while (len--) { 653 chksum += *cp; 654 if (clpoutbyte(*cp++, LPMAXSPIN2, ppbus)) 655 goto nend; 656 } 657 } while ((mm = mm->m_next)); 658 659 /* Send checksum */ 660 if (clpoutbyte(chksum, LPMAXSPIN2, ppbus)) 661 goto nend; 662 663 /* Go quiescent */ 664 ppb_wdtr(ppbus, 0); 665 666 err = 0; /* No errors */ 667 668 nend: 669 if (err) { /* if we didn't timeout... */ 670 ifp->if_oerrors++; 671 lprintf("X"); 672 } else { 673 ifp->if_opackets++; 674 ifp->if_obytes += m->m_pkthdr.len; 675 if (ifp->if_bpf) 676 lptap(ifp, m); 677 } 678 679 m_freem(m); 680 681 if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) { 682 lprintf("^"); 683 lp_intr(dev); 684 } 685 crit_exit(); 686 return 0; 687 } 688 689 if (ppb_rstr(ppbus) & LPIP_SHAKE) { 690 lprintf("&"); 691 lp_intr(dev); 692 } 693 694 if (lpoutbyte(0x08, LPMAXSPIN1, ppbus)) 695 goto end; 696 if (lpoutbyte(0x00, LPMAXSPIN2, ppbus)) 697 goto end; 698 699 mm = m; 700 do { 701 cp = mtod(mm,u_char *); 702 len = mm->m_len; 703 while (len--) 704 if (lpoutbyte(*cp++, LPMAXSPIN2, ppbus)) 705 goto end; 706 } while ((mm = mm->m_next)); 707 708 err = 0; /* no errors were encountered */ 709 710 end: 711 --cp; 712 ppb_wdtr(ppbus, txmitl[*cp] ^ 0x17); 713 714 if (err) { /* if we didn't timeout... */ 715 ifp->if_oerrors++; 716 lprintf("X"); 717 } else { 718 ifp->if_opackets++; 719 ifp->if_obytes += m->m_pkthdr.len; 720 if (ifp->if_bpf) 721 lptap(ifp, m); 722 } 723 724 m_freem(m); 725 726 if (ppb_rstr(ppbus) & LPIP_SHAKE) { 727 lprintf("^"); 728 lp_intr(dev); 729 } 730 731 crit_exit(); 732 return 0; 733 } 734 735 /* 736 * Because plip is a static device that always exists under any attached 737 * ppbus device, and not scanned by the ppbus device, we need an identify 738 * function to install the device. 739 */ 740 static device_method_t lp_methods[] = { 741 /* device interface */ 742 DEVMETHOD(device_identify, bus_generic_identify), 743 DEVMETHOD(device_probe, lp_probe), 744 DEVMETHOD(device_attach, lp_attach), 745 746 { 0, 0 } 747 }; 748 749 static driver_t lp_driver = { 750 "plip", 751 lp_methods, 752 sizeof(struct lp_data), 753 }; 754 755 DECLARE_DUMMY_MODULE(if_plip); 756 DRIVER_MODULE(if_plip, ppbus, lp_driver, lp_devclass, NULL, NULL); 757 758