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 1.19 2006/12/22 23:26:21 swildner 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/rman.h> 94 #include <sys/thread2.h> 95 96 #include <machine/clock.h> 97 98 #include <net/if.h> 99 #include <net/ifq_var.h> 100 #include <net/if_types.h> 101 #include <net/netisr.h> 102 103 #include <netinet/in.h> 104 #include <netinet/in_var.h> 105 106 #include <net/bpf.h> 107 108 #include <bus/ppbus/ppbconf.h> 109 #include "ppbus_if.h" 110 #include <bus/ppbus/ppbio.h> 111 112 #ifndef LPMTU /* MTU for the lp# interfaces */ 113 #define LPMTU 1500 114 #endif 115 116 #ifndef LPMAXSPIN1 /* DELAY factor for the lp# interfaces */ 117 #define LPMAXSPIN1 8000 /* Spinning for remote intr to happen */ 118 #endif 119 120 #ifndef LPMAXSPIN2 /* DELAY factor for the lp# interfaces */ 121 #define LPMAXSPIN2 500 /* Spinning for remote handshake to happen */ 122 #endif 123 124 #ifndef LPMAXERRS /* Max errors before !RUNNING */ 125 #define LPMAXERRS 100 126 #endif 127 128 #define CLPIPHDRLEN 14 /* We send dummy ethernet addresses (two) + packet type in front of packet */ 129 #define CLPIP_SHAKE 0x80 /* This bit toggles between nibble reception */ 130 #define MLPIPHDRLEN CLPIPHDRLEN 131 132 #define LPIPHDRLEN 2 /* We send 0x08, 0x00 in front of packet */ 133 #define LPIP_SHAKE 0x40 /* This bit toggles between nibble reception */ 134 #if !defined(MLPIPHDRLEN) || LPIPHDRLEN > MLPIPHDRLEN 135 #define MLPIPHDRLEN LPIPHDRLEN 136 #endif 137 138 #define LPIPTBLSIZE 256 /* Size of octet translation table */ 139 140 #define lprintf if (lptflag) kprintf 141 142 #ifdef PLIP_DEBUG 143 static int volatile lptflag = 1; 144 #else 145 static int volatile lptflag = 0; 146 #endif 147 148 struct lp_data { 149 unsigned short lp_unit; 150 151 struct ifnet sc_if; 152 u_char *sc_ifbuf; 153 int sc_iferrs; 154 155 struct resource *res_irq; 156 }; 157 158 /* Tables for the lp# interface */ 159 static u_char *txmith; 160 #define txmitl (txmith+(1*LPIPTBLSIZE)) 161 #define trecvh (txmith+(2*LPIPTBLSIZE)) 162 #define trecvl (txmith+(3*LPIPTBLSIZE)) 163 164 static u_char *ctxmith; 165 #define ctxmitl (ctxmith+(1*LPIPTBLSIZE)) 166 #define ctrecvh (ctxmith+(2*LPIPTBLSIZE)) 167 #define ctrecvl (ctxmith+(3*LPIPTBLSIZE)) 168 169 /* Functions for the lp# interface */ 170 static int lpinittables(void); 171 static int lpioctl(struct ifnet *, u_long, caddr_t, struct ucred *); 172 static int lpoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 173 struct rtentry *); 174 static void lp_intr(void *); 175 176 #define DEVTOSOFTC(dev) \ 177 ((struct lp_data *)device_get_softc(dev)) 178 #define UNITOSOFTC(unit) \ 179 ((struct lp_data *)devclass_get_softc(lp_devclass, (unit))) 180 #define UNITODEVICE(unit) \ 181 (devclass_get_device(lp_devclass, (unit))) 182 183 static devclass_t lp_devclass; 184 185 /* 186 * lpprobe() 187 */ 188 static int 189 lp_probe(device_t dev) 190 { 191 device_t ppbus = device_get_parent(dev); 192 struct lp_data *lp; 193 int zero = 0; 194 uintptr_t irq; 195 196 lp = DEVTOSOFTC(dev); 197 198 /* retrieve the ppbus irq */ 199 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 200 201 /* if we haven't interrupts, the probe fails */ 202 if (irq == -1) { 203 device_printf(dev, "not an interrupt driven port, failed.\n"); 204 return (ENXIO); 205 } 206 207 /* reserve the interrupt resource, expecting irq is available to continue */ 208 lp->res_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &zero, irq, irq, 1, 209 RF_SHAREABLE); 210 if (lp->res_irq == 0) { 211 device_printf(dev, "cannot reserve interrupt, failed.\n"); 212 return (ENXIO); 213 } 214 215 /* 216 * lp dependent initialisation. 217 */ 218 lp->lp_unit = device_get_unit(dev); 219 220 device_set_desc(dev, "PLIP network interface"); 221 222 return (0); 223 } 224 225 static int 226 lp_attach (device_t dev) 227 { 228 struct lp_data *lp = DEVTOSOFTC(dev); 229 struct ifnet *ifp = &lp->sc_if; 230 231 ifp->if_softc = lp; 232 if_initname(ifp, "lp", device_get_unit(dev)); 233 ifp->if_mtu = LPMTU; 234 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST; 235 ifp->if_ioctl = lpioctl; 236 ifp->if_output = lpoutput; 237 ifp->if_type = IFT_PARA; 238 ifp->if_hdrlen = 0; 239 ifp->if_addrlen = 0; 240 ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN); 241 if_attach(ifp, NULL); 242 243 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 244 245 return (0); 246 } 247 /* 248 * Build the translation tables for the LPIP (BSD unix) protocol. 249 * We don't want to calculate these nasties in our tight loop, so we 250 * precalculate them when we initialize. 251 */ 252 static int 253 lpinittables (void) 254 { 255 int i; 256 257 if (!txmith) 258 txmith = kmalloc(4*LPIPTBLSIZE, M_DEVBUF, M_WAITOK); 259 260 if (!ctxmith) 261 ctxmith = kmalloc(4*LPIPTBLSIZE, M_DEVBUF, M_WAITOK); 262 263 for (i=0; i < LPIPTBLSIZE; i++) { 264 ctxmith[i] = (i & 0xF0) >> 4; 265 ctxmitl[i] = 0x10 | (i & 0x0F); 266 ctrecvh[i] = (i & 0x78) << 1; 267 ctrecvl[i] = (i & 0x78) >> 3; 268 } 269 270 for (i=0; i < LPIPTBLSIZE; i++) { 271 txmith[i] = ((i & 0x80) >> 3) | ((i & 0x70) >> 4) | 0x08; 272 txmitl[i] = ((i & 0x08) << 1) | (i & 0x07); 273 trecvh[i] = ((~i) & 0x80) | ((i & 0x38) << 1); 274 trecvl[i] = (((~i) & 0x80) >> 4) | ((i & 0x38) >> 3); 275 } 276 277 return 0; 278 } 279 280 /* 281 * Process an ioctl request. 282 */ 283 284 static int 285 lpioctl (struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) 286 { 287 device_t dev = UNITODEVICE(ifp->if_dunit); 288 device_t ppbus = device_get_parent(dev); 289 struct lp_data *sc = DEVTOSOFTC(dev); 290 struct ifaddr *ifa = (struct ifaddr *)data; 291 struct ifreq *ifr = (struct ifreq *)data; 292 u_char *ptr; 293 void *ih; 294 int error; 295 296 switch (cmd) { 297 298 case SIOCSIFDSTADDR: 299 case SIOCAIFADDR: 300 case SIOCSIFADDR: 301 if (ifa->ifa_addr->sa_family != AF_INET) 302 return EAFNOSUPPORT; 303 304 ifp->if_flags |= IFF_UP; 305 /* FALLTHROUGH */ 306 case SIOCSIFFLAGS: 307 if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) { 308 309 ppb_wctr(ppbus, 0x00); 310 ifp->if_flags &= ~IFF_RUNNING; 311 312 /* IFF_UP is not set, try to release the bus anyway */ 313 ppb_release_bus(ppbus, dev); 314 break; 315 } 316 if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) { 317 318 /* XXX 319 * Should the request be interruptible? 320 */ 321 if ((error = ppb_request_bus(ppbus, dev, PPB_WAIT|PPB_INTR))) 322 return (error); 323 324 /* Now IFF_UP means that we own the bus */ 325 326 ppb_set_mode(ppbus, PPB_COMPATIBLE); 327 328 if (lpinittables()) { 329 ppb_release_bus(ppbus, dev); 330 return ENOBUFS; 331 } 332 333 sc->sc_ifbuf = kmalloc(sc->sc_if.if_mtu + MLPIPHDRLEN, 334 M_DEVBUF, M_WAITOK); 335 if (!sc->sc_ifbuf) { 336 ppb_release_bus(ppbus, dev); 337 return ENOBUFS; 338 } 339 340 /* attach our interrupt handler, later detached when the bus is released */ 341 error = BUS_SETUP_INTR(ppbus, dev, sc->res_irq, 0, 342 lp_intr, dev, &ih, NULL); 343 if (error) { 344 ppb_release_bus(ppbus, dev); 345 return (error); 346 } 347 348 ppb_wctr(ppbus, IRQENABLE); 349 ifp->if_flags |= IFF_RUNNING; 350 } 351 break; 352 353 case SIOCSIFMTU: 354 ptr = sc->sc_ifbuf; 355 sc->sc_ifbuf = kmalloc(ifr->ifr_mtu+MLPIPHDRLEN, M_DEVBUF, M_WAITOK); 356 if (ptr) 357 kfree(ptr,M_DEVBUF); 358 sc->sc_if.if_mtu = ifr->ifr_mtu; 359 break; 360 361 case SIOCGIFMTU: 362 ifr->ifr_mtu = sc->sc_if.if_mtu; 363 break; 364 365 case SIOCADDMULTI: 366 case SIOCDELMULTI: 367 if (ifr == 0) { 368 return EAFNOSUPPORT; /* XXX */ 369 } 370 switch (ifr->ifr_addr.sa_family) { 371 372 case AF_INET: 373 break; 374 375 default: 376 return EAFNOSUPPORT; 377 } 378 break; 379 380 case SIOCGIFMEDIA: 381 /* 382 * No ifmedia support at this stage; maybe use it 383 * in future for eg. protocol selection. 384 */ 385 return EINVAL; 386 387 default: 388 lprintf("LP:ioctl(0x%lx)\n", cmd); 389 return EINVAL; 390 } 391 return 0; 392 } 393 394 static __inline int 395 clpoutbyte (u_char byte, int spin, device_t ppbus) 396 { 397 ppb_wdtr(ppbus, ctxmitl[byte]); 398 while (ppb_rstr(ppbus) & CLPIP_SHAKE) 399 if (--spin == 0) { 400 return 1; 401 } 402 ppb_wdtr(ppbus, ctxmith[byte]); 403 while (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) 404 if (--spin == 0) { 405 return 1; 406 } 407 return 0; 408 } 409 410 static __inline int 411 clpinbyte (int spin, device_t ppbus) 412 { 413 u_char c, cl; 414 415 while((ppb_rstr(ppbus) & CLPIP_SHAKE)) 416 if(!--spin) { 417 return -1; 418 } 419 cl = ppb_rstr(ppbus); 420 ppb_wdtr(ppbus, 0x10); 421 422 while(!(ppb_rstr(ppbus) & CLPIP_SHAKE)) 423 if(!--spin) { 424 return -1; 425 } 426 c = ppb_rstr(ppbus); 427 ppb_wdtr(ppbus, 0x00); 428 429 return (ctrecvl[cl] | ctrecvh[c]); 430 } 431 432 static void 433 lptap(struct ifnet *ifp, struct mbuf *m) 434 { 435 /* 436 * We need to prepend the address family as a four byte field. 437 */ 438 static const uint32_t af = AF_INET; 439 440 if (ifp->if_bpf) 441 bpf_ptap(ifp->if_bpf, m, &af, sizeof(af)); 442 } 443 444 static void 445 lp_intr (void *arg) 446 { 447 device_t dev = (device_t)arg; 448 device_t ppbus = device_get_parent(dev); 449 struct lp_data *sc = DEVTOSOFTC(dev); 450 int len, j; 451 u_char *bp; 452 u_char c, cl; 453 struct mbuf *top; 454 455 crit_enter(); 456 457 if (sc->sc_if.if_flags & IFF_LINK0) { 458 459 /* Ack. the request */ 460 ppb_wdtr(ppbus, 0x01); 461 462 /* Get the packet length */ 463 j = clpinbyte(LPMAXSPIN2, ppbus); 464 if (j == -1) 465 goto err; 466 len = j; 467 j = clpinbyte(LPMAXSPIN2, ppbus); 468 if (j == -1) 469 goto err; 470 len = len + (j << 8); 471 if (len > sc->sc_if.if_mtu + MLPIPHDRLEN) 472 goto err; 473 474 bp = sc->sc_ifbuf; 475 476 while (len--) { 477 j = clpinbyte(LPMAXSPIN2, ppbus); 478 if (j == -1) { 479 goto err; 480 } 481 *bp++ = j; 482 } 483 /* Get and ignore checksum */ 484 j = clpinbyte(LPMAXSPIN2, ppbus); 485 if (j == -1) { 486 goto err; 487 } 488 489 len = bp - sc->sc_ifbuf; 490 if (len <= CLPIPHDRLEN) 491 goto err; 492 493 sc->sc_iferrs = 0; 494 495 len -= CLPIPHDRLEN; 496 sc->sc_if.if_ipackets++; 497 sc->sc_if.if_ibytes += len; 498 top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, &sc->sc_if, 0); 499 if (top) { 500 if (sc->sc_if.if_bpf) 501 lptap(&sc->sc_if, top); 502 netisr_queue(NETISR_IP, top); 503 } 504 goto done; 505 } 506 while ((ppb_rstr(ppbus) & LPIP_SHAKE)) { 507 len = sc->sc_if.if_mtu + LPIPHDRLEN; 508 bp = sc->sc_ifbuf; 509 while (len--) { 510 511 cl = ppb_rstr(ppbus); 512 ppb_wdtr(ppbus, 8); 513 514 j = LPMAXSPIN2; 515 while((ppb_rstr(ppbus) & LPIP_SHAKE)) 516 if(!--j) goto err; 517 518 c = ppb_rstr(ppbus); 519 ppb_wdtr(ppbus, 0); 520 521 *bp++= trecvh[cl] | trecvl[c]; 522 523 j = LPMAXSPIN2; 524 while (!((cl=ppb_rstr(ppbus)) & LPIP_SHAKE)) { 525 if (cl != c && 526 (((cl = ppb_rstr(ppbus)) ^ 0xb8) & 0xf8) == 527 (c & 0xf8)) 528 goto end; 529 if (!--j) goto err; 530 } 531 } 532 533 end: 534 len = bp - sc->sc_ifbuf; 535 if (len <= LPIPHDRLEN) 536 goto err; 537 538 sc->sc_iferrs = 0; 539 540 len -= LPIPHDRLEN; 541 sc->sc_if.if_ipackets++; 542 sc->sc_if.if_ibytes += len; 543 top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, &sc->sc_if, 0); 544 if (top) { 545 if (sc->sc_if.if_bpf) 546 lptap(&sc->sc_if, top); 547 netisr_queue(NETISR_IP, top); 548 } 549 } 550 goto done; 551 552 err: 553 ppb_wdtr(ppbus, 0); 554 lprintf("R"); 555 sc->sc_if.if_ierrors++; 556 sc->sc_iferrs++; 557 558 /* 559 * We are not able to send receive anything for now, 560 * so stop wasting our time 561 */ 562 if (sc->sc_iferrs > LPMAXERRS) { 563 kprintf("lp%d: Too many errors, Going off-line.\n", device_get_unit(dev)); 564 ppb_wctr(ppbus, 0x00); 565 sc->sc_if.if_flags &= ~IFF_RUNNING; 566 sc->sc_iferrs=0; 567 } 568 569 done: 570 crit_exit(); 571 return; 572 } 573 574 static __inline int 575 lpoutbyte (u_char byte, int spin, device_t ppbus) 576 { 577 ppb_wdtr(ppbus, txmith[byte]); 578 while (!(ppb_rstr(ppbus) & LPIP_SHAKE)) 579 if (--spin == 0) 580 return 1; 581 ppb_wdtr(ppbus, txmitl[byte]); 582 while (ppb_rstr(ppbus) & LPIP_SHAKE) 583 if (--spin == 0) 584 return 1; 585 return 0; 586 } 587 588 static int 589 lpoutput (struct ifnet *ifp, struct mbuf *m, 590 struct sockaddr *dst, struct rtentry *rt) 591 { 592 device_t dev = UNITODEVICE(ifp->if_dunit); 593 device_t ppbus = device_get_parent(dev); 594 int err; 595 struct mbuf *mm; 596 u_char *cp = "\0\0"; 597 u_char chksum = 0; 598 int count = 0; 599 int i, len, spin; 600 601 /* We need a sensible value if we abort */ 602 cp++; 603 ifp->if_flags |= IFF_RUNNING; 604 605 err = 1; /* assume we're aborting because of an error */ 606 607 crit_enter(); 608 609 /* Suspend (on laptops) or receive-errors might have taken us offline */ 610 ppb_wctr(ppbus, IRQENABLE); 611 612 if (ifp->if_flags & IFF_LINK0) { 613 614 if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) { 615 lprintf("&"); 616 lp_intr(dev); 617 } 618 619 /* Alert other end to pending packet */ 620 spin = LPMAXSPIN1; 621 ppb_wdtr(ppbus, 0x08); 622 while ((ppb_rstr(ppbus) & 0x08) == 0) 623 if (--spin == 0) { 624 goto nend; 625 } 626 627 /* Calculate length of packet, then send that */ 628 629 count += 14; /* Ethernet header len */ 630 631 mm = m; 632 for (mm = m; mm; mm = mm->m_next) { 633 count += mm->m_len; 634 } 635 if (clpoutbyte(count & 0xFF, LPMAXSPIN1, ppbus)) 636 goto nend; 637 if (clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, ppbus)) 638 goto nend; 639 640 /* Send dummy ethernet header */ 641 for (i = 0; i < 12; i++) { 642 if (clpoutbyte(i, LPMAXSPIN1, ppbus)) 643 goto nend; 644 chksum += i; 645 } 646 647 if (clpoutbyte(0x08, LPMAXSPIN1, ppbus)) 648 goto nend; 649 if (clpoutbyte(0x00, LPMAXSPIN1, ppbus)) 650 goto nend; 651 chksum += 0x08 + 0x00; /* Add into checksum */ 652 653 mm = m; 654 do { 655 cp = mtod(mm, u_char *); 656 len = mm->m_len; 657 while (len--) { 658 chksum += *cp; 659 if (clpoutbyte(*cp++, LPMAXSPIN2, ppbus)) 660 goto nend; 661 } 662 } while ((mm = mm->m_next)); 663 664 /* Send checksum */ 665 if (clpoutbyte(chksum, LPMAXSPIN2, ppbus)) 666 goto nend; 667 668 /* Go quiescent */ 669 ppb_wdtr(ppbus, 0); 670 671 err = 0; /* No errors */ 672 673 nend: 674 if (err) { /* if we didn't timeout... */ 675 ifp->if_oerrors++; 676 lprintf("X"); 677 } else { 678 ifp->if_opackets++; 679 ifp->if_obytes += m->m_pkthdr.len; 680 if (ifp->if_bpf) 681 lptap(ifp, m); 682 } 683 684 m_freem(m); 685 686 if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) { 687 lprintf("^"); 688 lp_intr(dev); 689 } 690 crit_exit(); 691 return 0; 692 } 693 694 if (ppb_rstr(ppbus) & LPIP_SHAKE) { 695 lprintf("&"); 696 lp_intr(dev); 697 } 698 699 if (lpoutbyte(0x08, LPMAXSPIN1, ppbus)) 700 goto end; 701 if (lpoutbyte(0x00, LPMAXSPIN2, ppbus)) 702 goto end; 703 704 mm = m; 705 do { 706 cp = mtod(mm,u_char *); 707 len = mm->m_len; 708 while (len--) 709 if (lpoutbyte(*cp++, LPMAXSPIN2, ppbus)) 710 goto end; 711 } while ((mm = mm->m_next)); 712 713 err = 0; /* no errors were encountered */ 714 715 end: 716 --cp; 717 ppb_wdtr(ppbus, txmitl[*cp] ^ 0x17); 718 719 if (err) { /* if we didn't timeout... */ 720 ifp->if_oerrors++; 721 lprintf("X"); 722 } else { 723 ifp->if_opackets++; 724 ifp->if_obytes += m->m_pkthdr.len; 725 if (ifp->if_bpf) 726 lptap(ifp, m); 727 } 728 729 m_freem(m); 730 731 if (ppb_rstr(ppbus) & LPIP_SHAKE) { 732 lprintf("^"); 733 lp_intr(dev); 734 } 735 736 crit_exit(); 737 return 0; 738 } 739 740 /* 741 * Because plip is a static device that always exists under any attached 742 * ppbus device, and not scanned by the ppbus device, we need an identify 743 * function to install the device. 744 */ 745 static device_method_t lp_methods[] = { 746 /* device interface */ 747 DEVMETHOD(device_identify, bus_generic_identify), 748 DEVMETHOD(device_probe, lp_probe), 749 DEVMETHOD(device_attach, lp_attach), 750 751 { 0, 0 } 752 }; 753 754 static driver_t lp_driver = { 755 "plip", 756 lp_methods, 757 sizeof(struct lp_data), 758 }; 759 760 DECLARE_DUMMY_MODULE(if_plip); 761 DRIVER_MODULE(if_plip, ppbus, lp_driver, lp_devclass, 0, 0); 762 763