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 1.8 2004/04/07 05:45:29 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 94 #include <machine/clock.h> 95 #include <machine/bus.h> 96 #include <machine/resource.h> 97 #include <sys/rman.h> 98 99 #include <net/if.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) printf 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 static void 186 lp_identify(driver_t *driver, device_t parent) 187 { 188 189 BUS_ADD_CHILD(parent, 0, "plip", 0); 190 } 191 /* 192 * lpprobe() 193 */ 194 static int 195 lp_probe(device_t dev) 196 { 197 device_t ppbus = device_get_parent(dev); 198 struct lp_data *lp; 199 int zero = 0; 200 uintptr_t irq; 201 202 lp = DEVTOSOFTC(dev); 203 bzero(lp, sizeof(struct lp_data)); 204 205 /* retrieve the ppbus irq */ 206 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 207 208 /* if we haven't interrupts, the probe fails */ 209 if (irq == -1) { 210 device_printf(dev, "not an interrupt driven port, failed.\n"); 211 return (ENXIO); 212 } 213 214 /* reserve the interrupt resource, expecting irq is available to continue */ 215 lp->res_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &zero, irq, irq, 1, 216 RF_SHAREABLE); 217 if (lp->res_irq == 0) { 218 device_printf(dev, "cannot reserve interrupt, failed.\n"); 219 return (ENXIO); 220 } 221 222 /* 223 * lp dependent initialisation. 224 */ 225 lp->lp_unit = device_get_unit(dev); 226 227 device_set_desc(dev, "PLIP network interface"); 228 229 return (0); 230 } 231 232 static int 233 lp_attach (device_t dev) 234 { 235 struct lp_data *lp = DEVTOSOFTC(dev); 236 struct ifnet *ifp = &lp->sc_if; 237 238 ifp->if_softc = lp; 239 if_initname(ifp, "lp", device_get_unit(dev)); 240 ifp->if_mtu = LPMTU; 241 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST; 242 ifp->if_ioctl = lpioctl; 243 ifp->if_output = lpoutput; 244 ifp->if_type = IFT_PARA; 245 ifp->if_hdrlen = 0; 246 ifp->if_addrlen = 0; 247 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 248 if_attach(ifp); 249 250 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 251 252 return (0); 253 } 254 /* 255 * Build the translation tables for the LPIP (BSD unix) protocol. 256 * We don't want to calculate these nasties in our tight loop, so we 257 * precalculate them when we initialize. 258 */ 259 static int 260 lpinittables (void) 261 { 262 int i; 263 264 if (!txmith) 265 txmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_WAITOK); 266 267 if (!ctxmith) 268 ctxmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_WAITOK); 269 270 for (i=0; i < LPIPTBLSIZE; i++) { 271 ctxmith[i] = (i & 0xF0) >> 4; 272 ctxmitl[i] = 0x10 | (i & 0x0F); 273 ctrecvh[i] = (i & 0x78) << 1; 274 ctrecvl[i] = (i & 0x78) >> 3; 275 } 276 277 for (i=0; i < LPIPTBLSIZE; i++) { 278 txmith[i] = ((i & 0x80) >> 3) | ((i & 0x70) >> 4) | 0x08; 279 txmitl[i] = ((i & 0x08) << 1) | (i & 0x07); 280 trecvh[i] = ((~i) & 0x80) | ((i & 0x38) << 1); 281 trecvl[i] = (((~i) & 0x80) >> 4) | ((i & 0x38) >> 3); 282 } 283 284 return 0; 285 } 286 287 /* 288 * Process an ioctl request. 289 */ 290 291 static int 292 lpioctl (struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) 293 { 294 device_t dev = UNITODEVICE(ifp->if_dunit); 295 device_t ppbus = device_get_parent(dev); 296 struct lp_data *sc = DEVTOSOFTC(dev); 297 struct ifaddr *ifa = (struct ifaddr *)data; 298 struct ifreq *ifr = (struct ifreq *)data; 299 u_char *ptr; 300 void *ih; 301 int error; 302 303 switch (cmd) { 304 305 case SIOCSIFDSTADDR: 306 case SIOCAIFADDR: 307 case SIOCSIFADDR: 308 if (ifa->ifa_addr->sa_family != AF_INET) 309 return EAFNOSUPPORT; 310 311 ifp->if_flags |= IFF_UP; 312 /* FALLTHROUGH */ 313 case SIOCSIFFLAGS: 314 if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) { 315 316 ppb_wctr(ppbus, 0x00); 317 ifp->if_flags &= ~IFF_RUNNING; 318 319 /* IFF_UP is not set, try to release the bus anyway */ 320 ppb_release_bus(ppbus, dev); 321 break; 322 } 323 if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) { 324 325 /* XXX 326 * Should the request be interruptible? 327 */ 328 if ((error = ppb_request_bus(ppbus, dev, PPB_WAIT|PPB_INTR))) 329 return (error); 330 331 /* Now IFF_UP means that we own the bus */ 332 333 ppb_set_mode(ppbus, PPB_COMPATIBLE); 334 335 if (lpinittables()) { 336 ppb_release_bus(ppbus, dev); 337 return ENOBUFS; 338 } 339 340 sc->sc_ifbuf = malloc(sc->sc_if.if_mtu + MLPIPHDRLEN, 341 M_DEVBUF, M_WAITOK); 342 if (!sc->sc_ifbuf) { 343 ppb_release_bus(ppbus, dev); 344 return ENOBUFS; 345 } 346 347 /* attach our interrupt handler, later detached when the bus is released */ 348 if ((error = BUS_SETUP_INTR(ppbus, dev, sc->res_irq, 349 INTR_TYPE_NET, lp_intr, dev, &ih))) { 350 ppb_release_bus(ppbus, dev); 351 return (error); 352 } 353 354 ppb_wctr(ppbus, IRQENABLE); 355 ifp->if_flags |= IFF_RUNNING; 356 } 357 break; 358 359 case SIOCSIFMTU: 360 ptr = sc->sc_ifbuf; 361 sc->sc_ifbuf = malloc(ifr->ifr_mtu+MLPIPHDRLEN, M_DEVBUF, M_WAITOK); 362 if (ptr) 363 free(ptr,M_DEVBUF); 364 sc->sc_if.if_mtu = ifr->ifr_mtu; 365 break; 366 367 case SIOCGIFMTU: 368 ifr->ifr_mtu = sc->sc_if.if_mtu; 369 break; 370 371 case SIOCADDMULTI: 372 case SIOCDELMULTI: 373 if (ifr == 0) { 374 return EAFNOSUPPORT; /* XXX */ 375 } 376 switch (ifr->ifr_addr.sa_family) { 377 378 case AF_INET: 379 break; 380 381 default: 382 return EAFNOSUPPORT; 383 } 384 break; 385 386 case SIOCGIFMEDIA: 387 /* 388 * No ifmedia support at this stage; maybe use it 389 * in future for eg. protocol selection. 390 */ 391 return EINVAL; 392 393 default: 394 lprintf("LP:ioctl(0x%lx)\n", cmd); 395 return EINVAL; 396 } 397 return 0; 398 } 399 400 static __inline int 401 clpoutbyte (u_char byte, int spin, device_t ppbus) 402 { 403 ppb_wdtr(ppbus, ctxmitl[byte]); 404 while (ppb_rstr(ppbus) & CLPIP_SHAKE) 405 if (--spin == 0) { 406 return 1; 407 } 408 ppb_wdtr(ppbus, ctxmith[byte]); 409 while (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) 410 if (--spin == 0) { 411 return 1; 412 } 413 return 0; 414 } 415 416 static __inline int 417 clpinbyte (int spin, device_t ppbus) 418 { 419 u_char c, cl; 420 421 while((ppb_rstr(ppbus) & CLPIP_SHAKE)) 422 if(!--spin) { 423 return -1; 424 } 425 cl = ppb_rstr(ppbus); 426 ppb_wdtr(ppbus, 0x10); 427 428 while(!(ppb_rstr(ppbus) & CLPIP_SHAKE)) 429 if(!--spin) { 430 return -1; 431 } 432 c = ppb_rstr(ppbus); 433 ppb_wdtr(ppbus, 0x00); 434 435 return (ctrecvl[cl] | ctrecvh[c]); 436 } 437 438 static void 439 lptap(struct ifnet *ifp, struct mbuf *m) 440 { 441 /* 442 * Send a packet through bpf. We need to prepend the address family 443 * as a four byte field. Cons up a dummy header to pacify bpf. This 444 * is safe because bpf will only read from the mbuf (i.e., it won't 445 * try to free it or keep a pointer to it). 446 */ 447 u_int32_t af = AF_INET; 448 struct mbuf m0; 449 450 m0.m_next = m; 451 m0.m_len = sizeof(u_int32_t); 452 m0.m_data = (char *)⁡ 453 bpf_mtap(ifp, &m0); 454 } 455 456 static void 457 lp_intr (void *arg) 458 { 459 device_t dev = (device_t)arg; 460 device_t ppbus = device_get_parent(dev); 461 struct lp_data *sc = DEVTOSOFTC(dev); 462 int len, s, j; 463 u_char *bp; 464 u_char c, cl; 465 struct mbuf *top; 466 467 s = splhigh(); 468 469 if (sc->sc_if.if_flags & IFF_LINK0) { 470 471 /* Ack. the request */ 472 ppb_wdtr(ppbus, 0x01); 473 474 /* Get the packet length */ 475 j = clpinbyte(LPMAXSPIN2, ppbus); 476 if (j == -1) 477 goto err; 478 len = j; 479 j = clpinbyte(LPMAXSPIN2, ppbus); 480 if (j == -1) 481 goto err; 482 len = len + (j << 8); 483 if (len > sc->sc_if.if_mtu + MLPIPHDRLEN) 484 goto err; 485 486 bp = sc->sc_ifbuf; 487 488 while (len--) { 489 j = clpinbyte(LPMAXSPIN2, ppbus); 490 if (j == -1) { 491 goto err; 492 } 493 *bp++ = j; 494 } 495 /* Get and ignore checksum */ 496 j = clpinbyte(LPMAXSPIN2, ppbus); 497 if (j == -1) { 498 goto err; 499 } 500 501 len = bp - sc->sc_ifbuf; 502 if (len <= CLPIPHDRLEN) 503 goto err; 504 505 sc->sc_iferrs = 0; 506 507 len -= CLPIPHDRLEN; 508 sc->sc_if.if_ipackets++; 509 sc->sc_if.if_ibytes += len; 510 top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, &sc->sc_if, 0); 511 if (top) { 512 if (sc->sc_if.if_bpf) 513 lptap(&sc->sc_if, top); 514 netisr_queue(NETISR_IP, top); 515 } 516 goto done; 517 } 518 while ((ppb_rstr(ppbus) & LPIP_SHAKE)) { 519 len = sc->sc_if.if_mtu + LPIPHDRLEN; 520 bp = sc->sc_ifbuf; 521 while (len--) { 522 523 cl = ppb_rstr(ppbus); 524 ppb_wdtr(ppbus, 8); 525 526 j = LPMAXSPIN2; 527 while((ppb_rstr(ppbus) & LPIP_SHAKE)) 528 if(!--j) goto err; 529 530 c = ppb_rstr(ppbus); 531 ppb_wdtr(ppbus, 0); 532 533 *bp++= trecvh[cl] | trecvl[c]; 534 535 j = LPMAXSPIN2; 536 while (!((cl=ppb_rstr(ppbus)) & LPIP_SHAKE)) { 537 if (cl != c && 538 (((cl = ppb_rstr(ppbus)) ^ 0xb8) & 0xf8) == 539 (c & 0xf8)) 540 goto end; 541 if (!--j) goto err; 542 } 543 } 544 545 end: 546 len = bp - sc->sc_ifbuf; 547 if (len <= LPIPHDRLEN) 548 goto err; 549 550 sc->sc_iferrs = 0; 551 552 len -= LPIPHDRLEN; 553 sc->sc_if.if_ipackets++; 554 sc->sc_if.if_ibytes += len; 555 top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, &sc->sc_if, 0); 556 if (top) { 557 if (sc->sc_if.if_bpf) 558 lptap(&sc->sc_if, top); 559 netisr_queue(NETISR_IP, top); 560 } 561 } 562 goto done; 563 564 err: 565 ppb_wdtr(ppbus, 0); 566 lprintf("R"); 567 sc->sc_if.if_ierrors++; 568 sc->sc_iferrs++; 569 570 /* 571 * We are not able to send receive anything for now, 572 * so stop wasting our time 573 */ 574 if (sc->sc_iferrs > LPMAXERRS) { 575 printf("lp%d: Too many errors, Going off-line.\n", device_get_unit(dev)); 576 ppb_wctr(ppbus, 0x00); 577 sc->sc_if.if_flags &= ~IFF_RUNNING; 578 sc->sc_iferrs=0; 579 } 580 581 done: 582 splx(s); 583 return; 584 } 585 586 static __inline int 587 lpoutbyte (u_char byte, int spin, device_t ppbus) 588 { 589 ppb_wdtr(ppbus, txmith[byte]); 590 while (!(ppb_rstr(ppbus) & LPIP_SHAKE)) 591 if (--spin == 0) 592 return 1; 593 ppb_wdtr(ppbus, txmitl[byte]); 594 while (ppb_rstr(ppbus) & LPIP_SHAKE) 595 if (--spin == 0) 596 return 1; 597 return 0; 598 } 599 600 static int 601 lpoutput (struct ifnet *ifp, struct mbuf *m, 602 struct sockaddr *dst, struct rtentry *rt) 603 { 604 device_t dev = UNITODEVICE(ifp->if_dunit); 605 device_t ppbus = device_get_parent(dev); 606 int s, err; 607 struct mbuf *mm; 608 u_char *cp = "\0\0"; 609 u_char chksum = 0; 610 int count = 0; 611 int i, len, spin; 612 613 /* We need a sensible value if we abort */ 614 cp++; 615 ifp->if_flags |= IFF_RUNNING; 616 617 err = 1; /* assume we're aborting because of an error */ 618 619 s = splhigh(); 620 621 /* Suspend (on laptops) or receive-errors might have taken us offline */ 622 ppb_wctr(ppbus, IRQENABLE); 623 624 if (ifp->if_flags & IFF_LINK0) { 625 626 if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) { 627 lprintf("&"); 628 lp_intr(dev); 629 } 630 631 /* Alert other end to pending packet */ 632 spin = LPMAXSPIN1; 633 ppb_wdtr(ppbus, 0x08); 634 while ((ppb_rstr(ppbus) & 0x08) == 0) 635 if (--spin == 0) { 636 goto nend; 637 } 638 639 /* Calculate length of packet, then send that */ 640 641 count += 14; /* Ethernet header len */ 642 643 mm = m; 644 for (mm = m; mm; mm = mm->m_next) { 645 count += mm->m_len; 646 } 647 if (clpoutbyte(count & 0xFF, LPMAXSPIN1, ppbus)) 648 goto nend; 649 if (clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, ppbus)) 650 goto nend; 651 652 /* Send dummy ethernet header */ 653 for (i = 0; i < 12; i++) { 654 if (clpoutbyte(i, LPMAXSPIN1, ppbus)) 655 goto nend; 656 chksum += i; 657 } 658 659 if (clpoutbyte(0x08, LPMAXSPIN1, ppbus)) 660 goto nend; 661 if (clpoutbyte(0x00, LPMAXSPIN1, ppbus)) 662 goto nend; 663 chksum += 0x08 + 0x00; /* Add into checksum */ 664 665 mm = m; 666 do { 667 cp = mtod(mm, u_char *); 668 len = mm->m_len; 669 while (len--) { 670 chksum += *cp; 671 if (clpoutbyte(*cp++, LPMAXSPIN2, ppbus)) 672 goto nend; 673 } 674 } while ((mm = mm->m_next)); 675 676 /* Send checksum */ 677 if (clpoutbyte(chksum, LPMAXSPIN2, ppbus)) 678 goto nend; 679 680 /* Go quiescent */ 681 ppb_wdtr(ppbus, 0); 682 683 err = 0; /* No errors */ 684 685 nend: 686 if (err) { /* if we didn't timeout... */ 687 ifp->if_oerrors++; 688 lprintf("X"); 689 } else { 690 ifp->if_opackets++; 691 ifp->if_obytes += m->m_pkthdr.len; 692 if (ifp->if_bpf) 693 lptap(ifp, m); 694 } 695 696 m_freem(m); 697 698 if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) { 699 lprintf("^"); 700 lp_intr(dev); 701 } 702 (void) splx(s); 703 return 0; 704 } 705 706 if (ppb_rstr(ppbus) & LPIP_SHAKE) { 707 lprintf("&"); 708 lp_intr(dev); 709 } 710 711 if (lpoutbyte(0x08, LPMAXSPIN1, ppbus)) 712 goto end; 713 if (lpoutbyte(0x00, LPMAXSPIN2, ppbus)) 714 goto end; 715 716 mm = m; 717 do { 718 cp = mtod(mm,u_char *); 719 len = mm->m_len; 720 while (len--) 721 if (lpoutbyte(*cp++, LPMAXSPIN2, ppbus)) 722 goto end; 723 } while ((mm = mm->m_next)); 724 725 err = 0; /* no errors were encountered */ 726 727 end: 728 --cp; 729 ppb_wdtr(ppbus, txmitl[*cp] ^ 0x17); 730 731 if (err) { /* if we didn't timeout... */ 732 ifp->if_oerrors++; 733 lprintf("X"); 734 } else { 735 ifp->if_opackets++; 736 ifp->if_obytes += m->m_pkthdr.len; 737 if (ifp->if_bpf) 738 lptap(ifp, m); 739 } 740 741 m_freem(m); 742 743 if (ppb_rstr(ppbus) & LPIP_SHAKE) { 744 lprintf("^"); 745 lp_intr(dev); 746 } 747 748 (void) splx(s); 749 return 0; 750 } 751 752 static device_method_t lp_methods[] = { 753 /* device interface */ 754 DEVMETHOD(device_identify, lp_identify), 755 DEVMETHOD(device_probe, lp_probe), 756 DEVMETHOD(device_attach, lp_attach), 757 758 { 0, 0 } 759 }; 760 761 static driver_t lp_driver = { 762 "plip", 763 lp_methods, 764 sizeof(struct lp_data), 765 }; 766 767 DECLARE_DUMMY_MODULE(if_plip); 768 DRIVER_MODULE(if_plip, ppbus, lp_driver, lp_devclass, 0, 0); 769 770