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 * $DragonFly: src/sys/dev/netif/plip/if_plip.c,v 1.16 2005/11/28 17:13:43 dillon Exp $ 29 */ 30 31 /* 32 * Parallel port TCP/IP interfaces added. I looked at the driver from 33 * MACH but this is a complete rewrite, and btw. incompatible, and it 34 * should perform better too. I have never run the MACH driver though. 35 * 36 * This driver sends two bytes (0x08, 0x00) in front of each packet, 37 * to allow us to distinguish another format later. 38 * 39 * Now added an Linux/Crynwr compatibility mode which is enabled using 40 * IF_LINK0 - Tim Wilkinson. 41 * 42 * TODO: 43 * Make HDLC/PPP mode, use IF_LLC1 to enable. 44 * 45 * Connect the two computers using a Laplink parallel cable to use this 46 * feature: 47 * 48 * +----------------------------------------+ 49 * |A-name A-End B-End Descr. Port/Bit | 50 * +----------------------------------------+ 51 * |DATA0 2 15 Data 0/0x01 | 52 * |-ERROR 15 2 1/0x08 | 53 * +----------------------------------------+ 54 * |DATA1 3 13 Data 0/0x02 | 55 * |+SLCT 13 3 1/0x10 | 56 * +----------------------------------------+ 57 * |DATA2 4 12 Data 0/0x04 | 58 * |+PE 12 4 1/0x20 | 59 * +----------------------------------------+ 60 * |DATA3 5 10 Strobe 0/0x08 | 61 * |-ACK 10 5 1/0x40 | 62 * +----------------------------------------+ 63 * |DATA4 6 11 Data 0/0x10 | 64 * |BUSY 11 6 1/~0x80 | 65 * +----------------------------------------+ 66 * |GND 18-25 18-25 GND - | 67 * +----------------------------------------+ 68 * 69 * Expect transfer-rates up to 75 kbyte/sec. 70 * 71 * If GCC could correctly grok 72 * register int port asm("edx") 73 * the code would be cleaner 74 * 75 * Poul-Henning Kamp <phk@freebsd.org> 76 */ 77 78 /* 79 * Update for ppbus, PLIP support only - Nicolas Souchu 80 */ 81 82 #include "opt_plip.h" 83 84 #include <sys/param.h> 85 #include <sys/systm.h> 86 #include <sys/module.h> 87 #include <sys/bus.h> 88 #include <sys/mbuf.h> 89 #include <sys/socket.h> 90 #include <sys/sockio.h> 91 #include <sys/kernel.h> 92 #include <sys/malloc.h> 93 #include <sys/thread2.h> 94 95 #include <machine/clock.h> 96 #include <machine/bus.h> 97 #include <machine/resource.h> 98 #include <sys/rman.h> 99 100 #include <net/if.h> 101 #include <net/ifq_var.h> 102 #include <net/if_types.h> 103 #include <net/netisr.h> 104 105 #include <netinet/in.h> 106 #include <netinet/in_var.h> 107 108 #include <net/bpf.h> 109 110 #include <bus/ppbus/ppbconf.h> 111 #include "ppbus_if.h" 112 #include <bus/ppbus/ppbio.h> 113 114 #ifndef LPMTU /* MTU for the lp# interfaces */ 115 #define LPMTU 1500 116 #endif 117 118 #ifndef LPMAXSPIN1 /* DELAY factor for the lp# interfaces */ 119 #define LPMAXSPIN1 8000 /* Spinning for remote intr to happen */ 120 #endif 121 122 #ifndef LPMAXSPIN2 /* DELAY factor for the lp# interfaces */ 123 #define LPMAXSPIN2 500 /* Spinning for remote handshake to happen */ 124 #endif 125 126 #ifndef LPMAXERRS /* Max errors before !RUNNING */ 127 #define LPMAXERRS 100 128 #endif 129 130 #define CLPIPHDRLEN 14 /* We send dummy ethernet addresses (two) + packet type in front of packet */ 131 #define CLPIP_SHAKE 0x80 /* This bit toggles between nibble reception */ 132 #define MLPIPHDRLEN CLPIPHDRLEN 133 134 #define LPIPHDRLEN 2 /* We send 0x08, 0x00 in front of packet */ 135 #define LPIP_SHAKE 0x40 /* This bit toggles between nibble reception */ 136 #if !defined(MLPIPHDRLEN) || LPIPHDRLEN > MLPIPHDRLEN 137 #define MLPIPHDRLEN LPIPHDRLEN 138 #endif 139 140 #define LPIPTBLSIZE 256 /* Size of octet translation table */ 141 142 #define lprintf if (lptflag) printf 143 144 #ifdef PLIP_DEBUG 145 static int volatile lptflag = 1; 146 #else 147 static int volatile lptflag = 0; 148 #endif 149 150 struct lp_data { 151 unsigned short lp_unit; 152 153 struct ifnet sc_if; 154 u_char *sc_ifbuf; 155 int sc_iferrs; 156 157 struct resource *res_irq; 158 }; 159 160 /* Tables for the lp# interface */ 161 static u_char *txmith; 162 #define txmitl (txmith+(1*LPIPTBLSIZE)) 163 #define trecvh (txmith+(2*LPIPTBLSIZE)) 164 #define trecvl (txmith+(3*LPIPTBLSIZE)) 165 166 static u_char *ctxmith; 167 #define ctxmitl (ctxmith+(1*LPIPTBLSIZE)) 168 #define ctrecvh (ctxmith+(2*LPIPTBLSIZE)) 169 #define ctrecvl (ctxmith+(3*LPIPTBLSIZE)) 170 171 /* Functions for the lp# interface */ 172 static int lpinittables(void); 173 static int lpioctl(struct ifnet *, u_long, caddr_t, struct ucred *); 174 static int lpoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 175 struct rtentry *); 176 static void lp_intr(void *); 177 178 #define DEVTOSOFTC(dev) \ 179 ((struct lp_data *)device_get_softc(dev)) 180 #define UNITOSOFTC(unit) \ 181 ((struct lp_data *)devclass_get_softc(lp_devclass, (unit))) 182 #define UNITODEVICE(unit) \ 183 (devclass_get_device(lp_devclass, (unit))) 184 185 static devclass_t lp_devclass; 186 187 /* 188 * lpprobe() 189 */ 190 static int 191 lp_probe(device_t dev) 192 { 193 device_t ppbus = device_get_parent(dev); 194 struct lp_data *lp; 195 int zero = 0; 196 uintptr_t irq; 197 198 lp = DEVTOSOFTC(dev); 199 200 /* retrieve the ppbus irq */ 201 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 202 203 /* if we haven't interrupts, the probe fails */ 204 if (irq == -1) { 205 device_printf(dev, "not an interrupt driven port, failed.\n"); 206 return (ENXIO); 207 } 208 209 /* reserve the interrupt resource, expecting irq is available to continue */ 210 lp->res_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &zero, irq, irq, 1, 211 RF_SHAREABLE); 212 if (lp->res_irq == 0) { 213 device_printf(dev, "cannot reserve interrupt, failed.\n"); 214 return (ENXIO); 215 } 216 217 /* 218 * lp dependent initialisation. 219 */ 220 lp->lp_unit = device_get_unit(dev); 221 222 device_set_desc(dev, "PLIP network interface"); 223 224 return (0); 225 } 226 227 static int 228 lp_attach (device_t dev) 229 { 230 struct lp_data *lp = DEVTOSOFTC(dev); 231 struct ifnet *ifp = &lp->sc_if; 232 233 ifp->if_softc = lp; 234 if_initname(ifp, "lp", device_get_unit(dev)); 235 ifp->if_mtu = LPMTU; 236 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST; 237 ifp->if_ioctl = lpioctl; 238 ifp->if_output = lpoutput; 239 ifp->if_type = IFT_PARA; 240 ifp->if_hdrlen = 0; 241 ifp->if_addrlen = 0; 242 ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN); 243 if_attach(ifp, NULL); 244 245 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 246 247 return (0); 248 } 249 /* 250 * Build the translation tables for the LPIP (BSD unix) protocol. 251 * We don't want to calculate these nasties in our tight loop, so we 252 * precalculate them when we initialize. 253 */ 254 static int 255 lpinittables (void) 256 { 257 int i; 258 259 if (!txmith) 260 txmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_WAITOK); 261 262 if (!ctxmith) 263 ctxmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_WAITOK); 264 265 for (i=0; i < LPIPTBLSIZE; i++) { 266 ctxmith[i] = (i & 0xF0) >> 4; 267 ctxmitl[i] = 0x10 | (i & 0x0F); 268 ctrecvh[i] = (i & 0x78) << 1; 269 ctrecvl[i] = (i & 0x78) >> 3; 270 } 271 272 for (i=0; i < LPIPTBLSIZE; i++) { 273 txmith[i] = ((i & 0x80) >> 3) | ((i & 0x70) >> 4) | 0x08; 274 txmitl[i] = ((i & 0x08) << 1) | (i & 0x07); 275 trecvh[i] = ((~i) & 0x80) | ((i & 0x38) << 1); 276 trecvl[i] = (((~i) & 0x80) >> 4) | ((i & 0x38) >> 3); 277 } 278 279 return 0; 280 } 281 282 /* 283 * Process an ioctl request. 284 */ 285 286 static int 287 lpioctl (struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) 288 { 289 device_t dev = UNITODEVICE(ifp->if_dunit); 290 device_t ppbus = device_get_parent(dev); 291 struct lp_data *sc = DEVTOSOFTC(dev); 292 struct ifaddr *ifa = (struct ifaddr *)data; 293 struct ifreq *ifr = (struct ifreq *)data; 294 u_char *ptr; 295 void *ih; 296 int error; 297 298 switch (cmd) { 299 300 case SIOCSIFDSTADDR: 301 case SIOCAIFADDR: 302 case SIOCSIFADDR: 303 if (ifa->ifa_addr->sa_family != AF_INET) 304 return EAFNOSUPPORT; 305 306 ifp->if_flags |= IFF_UP; 307 /* FALLTHROUGH */ 308 case SIOCSIFFLAGS: 309 if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) { 310 311 ppb_wctr(ppbus, 0x00); 312 ifp->if_flags &= ~IFF_RUNNING; 313 314 /* IFF_UP is not set, try to release the bus anyway */ 315 ppb_release_bus(ppbus, dev); 316 break; 317 } 318 if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) { 319 320 /* XXX 321 * Should the request be interruptible? 322 */ 323 if ((error = ppb_request_bus(ppbus, dev, PPB_WAIT|PPB_INTR))) 324 return (error); 325 326 /* Now IFF_UP means that we own the bus */ 327 328 ppb_set_mode(ppbus, PPB_COMPATIBLE); 329 330 if (lpinittables()) { 331 ppb_release_bus(ppbus, dev); 332 return ENOBUFS; 333 } 334 335 sc->sc_ifbuf = malloc(sc->sc_if.if_mtu + MLPIPHDRLEN, 336 M_DEVBUF, M_WAITOK); 337 if (!sc->sc_ifbuf) { 338 ppb_release_bus(ppbus, dev); 339 return ENOBUFS; 340 } 341 342 /* attach our interrupt handler, later detached when the bus is released */ 343 error = BUS_SETUP_INTR(ppbus, dev, sc->res_irq, 0, 344 lp_intr, dev, &ih, NULL); 345 if (error) { 346 ppb_release_bus(ppbus, dev); 347 return (error); 348 } 349 350 ppb_wctr(ppbus, IRQENABLE); 351 ifp->if_flags |= IFF_RUNNING; 352 } 353 break; 354 355 case SIOCSIFMTU: 356 ptr = sc->sc_ifbuf; 357 sc->sc_ifbuf = malloc(ifr->ifr_mtu+MLPIPHDRLEN, M_DEVBUF, M_WAITOK); 358 if (ptr) 359 free(ptr,M_DEVBUF); 360 sc->sc_if.if_mtu = ifr->ifr_mtu; 361 break; 362 363 case SIOCGIFMTU: 364 ifr->ifr_mtu = sc->sc_if.if_mtu; 365 break; 366 367 case SIOCADDMULTI: 368 case SIOCDELMULTI: 369 if (ifr == 0) { 370 return EAFNOSUPPORT; /* XXX */ 371 } 372 switch (ifr->ifr_addr.sa_family) { 373 374 case AF_INET: 375 break; 376 377 default: 378 return EAFNOSUPPORT; 379 } 380 break; 381 382 case SIOCGIFMEDIA: 383 /* 384 * No ifmedia support at this stage; maybe use it 385 * in future for eg. protocol selection. 386 */ 387 return EINVAL; 388 389 default: 390 lprintf("LP:ioctl(0x%lx)\n", cmd); 391 return EINVAL; 392 } 393 return 0; 394 } 395 396 static __inline int 397 clpoutbyte (u_char byte, int spin, device_t ppbus) 398 { 399 ppb_wdtr(ppbus, ctxmitl[byte]); 400 while (ppb_rstr(ppbus) & CLPIP_SHAKE) 401 if (--spin == 0) { 402 return 1; 403 } 404 ppb_wdtr(ppbus, ctxmith[byte]); 405 while (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) 406 if (--spin == 0) { 407 return 1; 408 } 409 return 0; 410 } 411 412 static __inline int 413 clpinbyte (int spin, device_t ppbus) 414 { 415 u_char c, cl; 416 417 while((ppb_rstr(ppbus) & CLPIP_SHAKE)) 418 if(!--spin) { 419 return -1; 420 } 421 cl = ppb_rstr(ppbus); 422 ppb_wdtr(ppbus, 0x10); 423 424 while(!(ppb_rstr(ppbus) & CLPIP_SHAKE)) 425 if(!--spin) { 426 return -1; 427 } 428 c = ppb_rstr(ppbus); 429 ppb_wdtr(ppbus, 0x00); 430 431 return (ctrecvl[cl] | ctrecvh[c]); 432 } 433 434 static void 435 lptap(struct ifnet *ifp, struct mbuf *m) 436 { 437 /* 438 * We need to prepend the address family as a four byte field. 439 */ 440 static const uint32_t af = AF_INET; 441 442 if (ifp->if_bpf) 443 bpf_ptap(ifp->if_bpf, m, &af, sizeof(af)); 444 } 445 446 static void 447 lp_intr (void *arg) 448 { 449 device_t dev = (device_t)arg; 450 device_t ppbus = device_get_parent(dev); 451 struct lp_data *sc = DEVTOSOFTC(dev); 452 int len, j; 453 u_char *bp; 454 u_char c, cl; 455 struct mbuf *top; 456 457 crit_enter(); 458 459 if (sc->sc_if.if_flags & IFF_LINK0) { 460 461 /* Ack. the request */ 462 ppb_wdtr(ppbus, 0x01); 463 464 /* Get the packet length */ 465 j = clpinbyte(LPMAXSPIN2, ppbus); 466 if (j == -1) 467 goto err; 468 len = j; 469 j = clpinbyte(LPMAXSPIN2, ppbus); 470 if (j == -1) 471 goto err; 472 len = len + (j << 8); 473 if (len > sc->sc_if.if_mtu + MLPIPHDRLEN) 474 goto err; 475 476 bp = sc->sc_ifbuf; 477 478 while (len--) { 479 j = clpinbyte(LPMAXSPIN2, ppbus); 480 if (j == -1) { 481 goto err; 482 } 483 *bp++ = j; 484 } 485 /* Get and ignore checksum */ 486 j = clpinbyte(LPMAXSPIN2, ppbus); 487 if (j == -1) { 488 goto err; 489 } 490 491 len = bp - sc->sc_ifbuf; 492 if (len <= CLPIPHDRLEN) 493 goto err; 494 495 sc->sc_iferrs = 0; 496 497 len -= CLPIPHDRLEN; 498 sc->sc_if.if_ipackets++; 499 sc->sc_if.if_ibytes += len; 500 top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, &sc->sc_if, 0); 501 if (top) { 502 if (sc->sc_if.if_bpf) 503 lptap(&sc->sc_if, top); 504 netisr_queue(NETISR_IP, top); 505 } 506 goto done; 507 } 508 while ((ppb_rstr(ppbus) & LPIP_SHAKE)) { 509 len = sc->sc_if.if_mtu + LPIPHDRLEN; 510 bp = sc->sc_ifbuf; 511 while (len--) { 512 513 cl = ppb_rstr(ppbus); 514 ppb_wdtr(ppbus, 8); 515 516 j = LPMAXSPIN2; 517 while((ppb_rstr(ppbus) & LPIP_SHAKE)) 518 if(!--j) goto err; 519 520 c = ppb_rstr(ppbus); 521 ppb_wdtr(ppbus, 0); 522 523 *bp++= trecvh[cl] | trecvl[c]; 524 525 j = LPMAXSPIN2; 526 while (!((cl=ppb_rstr(ppbus)) & LPIP_SHAKE)) { 527 if (cl != c && 528 (((cl = ppb_rstr(ppbus)) ^ 0xb8) & 0xf8) == 529 (c & 0xf8)) 530 goto end; 531 if (!--j) goto err; 532 } 533 } 534 535 end: 536 len = bp - sc->sc_ifbuf; 537 if (len <= LPIPHDRLEN) 538 goto err; 539 540 sc->sc_iferrs = 0; 541 542 len -= LPIPHDRLEN; 543 sc->sc_if.if_ipackets++; 544 sc->sc_if.if_ibytes += len; 545 top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, &sc->sc_if, 0); 546 if (top) { 547 if (sc->sc_if.if_bpf) 548 lptap(&sc->sc_if, top); 549 netisr_queue(NETISR_IP, top); 550 } 551 } 552 goto done; 553 554 err: 555 ppb_wdtr(ppbus, 0); 556 lprintf("R"); 557 sc->sc_if.if_ierrors++; 558 sc->sc_iferrs++; 559 560 /* 561 * We are not able to send receive anything for now, 562 * so stop wasting our time 563 */ 564 if (sc->sc_iferrs > LPMAXERRS) { 565 printf("lp%d: Too many errors, Going off-line.\n", device_get_unit(dev)); 566 ppb_wctr(ppbus, 0x00); 567 sc->sc_if.if_flags &= ~IFF_RUNNING; 568 sc->sc_iferrs=0; 569 } 570 571 done: 572 crit_exit(); 573 return; 574 } 575 576 static __inline int 577 lpoutbyte (u_char byte, int spin, device_t ppbus) 578 { 579 ppb_wdtr(ppbus, txmith[byte]); 580 while (!(ppb_rstr(ppbus) & LPIP_SHAKE)) 581 if (--spin == 0) 582 return 1; 583 ppb_wdtr(ppbus, txmitl[byte]); 584 while (ppb_rstr(ppbus) & LPIP_SHAKE) 585 if (--spin == 0) 586 return 1; 587 return 0; 588 } 589 590 static int 591 lpoutput (struct ifnet *ifp, struct mbuf *m, 592 struct sockaddr *dst, struct rtentry *rt) 593 { 594 device_t dev = UNITODEVICE(ifp->if_dunit); 595 device_t ppbus = device_get_parent(dev); 596 int err; 597 struct mbuf *mm; 598 u_char *cp = "\0\0"; 599 u_char chksum = 0; 600 int count = 0; 601 int i, len, spin; 602 603 /* We need a sensible value if we abort */ 604 cp++; 605 ifp->if_flags |= IFF_RUNNING; 606 607 err = 1; /* assume we're aborting because of an error */ 608 609 crit_enter(); 610 611 /* Suspend (on laptops) or receive-errors might have taken us offline */ 612 ppb_wctr(ppbus, IRQENABLE); 613 614 if (ifp->if_flags & IFF_LINK0) { 615 616 if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) { 617 lprintf("&"); 618 lp_intr(dev); 619 } 620 621 /* Alert other end to pending packet */ 622 spin = LPMAXSPIN1; 623 ppb_wdtr(ppbus, 0x08); 624 while ((ppb_rstr(ppbus) & 0x08) == 0) 625 if (--spin == 0) { 626 goto nend; 627 } 628 629 /* Calculate length of packet, then send that */ 630 631 count += 14; /* Ethernet header len */ 632 633 mm = m; 634 for (mm = m; mm; mm = mm->m_next) { 635 count += mm->m_len; 636 } 637 if (clpoutbyte(count & 0xFF, LPMAXSPIN1, ppbus)) 638 goto nend; 639 if (clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, ppbus)) 640 goto nend; 641 642 /* Send dummy ethernet header */ 643 for (i = 0; i < 12; i++) { 644 if (clpoutbyte(i, LPMAXSPIN1, ppbus)) 645 goto nend; 646 chksum += i; 647 } 648 649 if (clpoutbyte(0x08, LPMAXSPIN1, ppbus)) 650 goto nend; 651 if (clpoutbyte(0x00, LPMAXSPIN1, ppbus)) 652 goto nend; 653 chksum += 0x08 + 0x00; /* Add into checksum */ 654 655 mm = m; 656 do { 657 cp = mtod(mm, u_char *); 658 len = mm->m_len; 659 while (len--) { 660 chksum += *cp; 661 if (clpoutbyte(*cp++, LPMAXSPIN2, ppbus)) 662 goto nend; 663 } 664 } while ((mm = mm->m_next)); 665 666 /* Send checksum */ 667 if (clpoutbyte(chksum, LPMAXSPIN2, ppbus)) 668 goto nend; 669 670 /* Go quiescent */ 671 ppb_wdtr(ppbus, 0); 672 673 err = 0; /* No errors */ 674 675 nend: 676 if (err) { /* if we didn't timeout... */ 677 ifp->if_oerrors++; 678 lprintf("X"); 679 } else { 680 ifp->if_opackets++; 681 ifp->if_obytes += m->m_pkthdr.len; 682 if (ifp->if_bpf) 683 lptap(ifp, m); 684 } 685 686 m_freem(m); 687 688 if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) { 689 lprintf("^"); 690 lp_intr(dev); 691 } 692 crit_exit(); 693 return 0; 694 } 695 696 if (ppb_rstr(ppbus) & LPIP_SHAKE) { 697 lprintf("&"); 698 lp_intr(dev); 699 } 700 701 if (lpoutbyte(0x08, LPMAXSPIN1, ppbus)) 702 goto end; 703 if (lpoutbyte(0x00, LPMAXSPIN2, ppbus)) 704 goto end; 705 706 mm = m; 707 do { 708 cp = mtod(mm,u_char *); 709 len = mm->m_len; 710 while (len--) 711 if (lpoutbyte(*cp++, LPMAXSPIN2, ppbus)) 712 goto end; 713 } while ((mm = mm->m_next)); 714 715 err = 0; /* no errors were encountered */ 716 717 end: 718 --cp; 719 ppb_wdtr(ppbus, txmitl[*cp] ^ 0x17); 720 721 if (err) { /* if we didn't timeout... */ 722 ifp->if_oerrors++; 723 lprintf("X"); 724 } else { 725 ifp->if_opackets++; 726 ifp->if_obytes += m->m_pkthdr.len; 727 if (ifp->if_bpf) 728 lptap(ifp, m); 729 } 730 731 m_freem(m); 732 733 if (ppb_rstr(ppbus) & LPIP_SHAKE) { 734 lprintf("^"); 735 lp_intr(dev); 736 } 737 738 crit_exit(); 739 return 0; 740 } 741 742 /* 743 * Because plip is a static device that always exists under any attached 744 * ppbus device, and not scanned by the ppbus device, we need an identify 745 * function to install the device. 746 */ 747 static device_method_t lp_methods[] = { 748 /* device interface */ 749 DEVMETHOD(device_identify, bus_generic_identify), 750 DEVMETHOD(device_probe, lp_probe), 751 DEVMETHOD(device_attach, lp_attach), 752 753 { 0, 0 } 754 }; 755 756 static driver_t lp_driver = { 757 "plip", 758 lp_methods, 759 sizeof(struct lp_data), 760 }; 761 762 DECLARE_DUMMY_MODULE(if_plip); 763 DRIVER_MODULE(if_plip, ppbus, lp_driver, lp_devclass, 0, 0); 764 765