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 1.20 2008/01/06 16:55:50 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); 335 336 /* attach our interrupt handler, later detached when the bus is released */ 337 error = BUS_SETUP_INTR(ppbus, dev, sc->res_irq, 0, 338 lp_intr, dev, &ih, NULL); 339 if (error) { 340 ppb_release_bus(ppbus, dev); 341 return (error); 342 } 343 344 ppb_wctr(ppbus, IRQENABLE); 345 ifp->if_flags |= IFF_RUNNING; 346 } 347 break; 348 349 case SIOCSIFMTU: 350 ptr = sc->sc_ifbuf; 351 sc->sc_ifbuf = kmalloc(ifr->ifr_mtu+MLPIPHDRLEN, M_DEVBUF, M_WAITOK); 352 if (ptr) 353 kfree(ptr,M_DEVBUF); 354 sc->sc_if.if_mtu = ifr->ifr_mtu; 355 break; 356 357 case SIOCGIFMTU: 358 ifr->ifr_mtu = sc->sc_if.if_mtu; 359 break; 360 361 case SIOCADDMULTI: 362 case SIOCDELMULTI: 363 if (ifr == 0) { 364 return EAFNOSUPPORT; /* XXX */ 365 } 366 switch (ifr->ifr_addr.sa_family) { 367 368 case AF_INET: 369 break; 370 371 default: 372 return EAFNOSUPPORT; 373 } 374 break; 375 376 case SIOCGIFMEDIA: 377 /* 378 * No ifmedia support at this stage; maybe use it 379 * in future for eg. protocol selection. 380 */ 381 return EINVAL; 382 383 default: 384 lprintf("LP:ioctl(0x%lx)\n", cmd); 385 return EINVAL; 386 } 387 return 0; 388 } 389 390 static __inline int 391 clpoutbyte (u_char byte, int spin, device_t ppbus) 392 { 393 ppb_wdtr(ppbus, ctxmitl[byte]); 394 while (ppb_rstr(ppbus) & CLPIP_SHAKE) 395 if (--spin == 0) { 396 return 1; 397 } 398 ppb_wdtr(ppbus, ctxmith[byte]); 399 while (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) 400 if (--spin == 0) { 401 return 1; 402 } 403 return 0; 404 } 405 406 static __inline int 407 clpinbyte (int spin, device_t ppbus) 408 { 409 u_char c, cl; 410 411 while((ppb_rstr(ppbus) & CLPIP_SHAKE)) 412 if(!--spin) { 413 return -1; 414 } 415 cl = ppb_rstr(ppbus); 416 ppb_wdtr(ppbus, 0x10); 417 418 while(!(ppb_rstr(ppbus) & CLPIP_SHAKE)) 419 if(!--spin) { 420 return -1; 421 } 422 c = ppb_rstr(ppbus); 423 ppb_wdtr(ppbus, 0x00); 424 425 return (ctrecvl[cl] | ctrecvh[c]); 426 } 427 428 static void 429 lptap(struct ifnet *ifp, struct mbuf *m) 430 { 431 /* 432 * We need to prepend the address family as a four byte field. 433 */ 434 static const uint32_t af = AF_INET; 435 436 if (ifp->if_bpf) 437 bpf_ptap(ifp->if_bpf, m, &af, sizeof(af)); 438 } 439 440 static void 441 lp_intr (void *arg) 442 { 443 device_t dev = (device_t)arg; 444 device_t ppbus = device_get_parent(dev); 445 struct lp_data *sc = DEVTOSOFTC(dev); 446 int len, j; 447 u_char *bp; 448 u_char c, cl; 449 struct mbuf *top; 450 451 crit_enter(); 452 453 if (sc->sc_if.if_flags & IFF_LINK0) { 454 455 /* Ack. the request */ 456 ppb_wdtr(ppbus, 0x01); 457 458 /* Get the packet length */ 459 j = clpinbyte(LPMAXSPIN2, ppbus); 460 if (j == -1) 461 goto err; 462 len = j; 463 j = clpinbyte(LPMAXSPIN2, ppbus); 464 if (j == -1) 465 goto err; 466 len = len + (j << 8); 467 if (len > sc->sc_if.if_mtu + MLPIPHDRLEN) 468 goto err; 469 470 bp = sc->sc_ifbuf; 471 472 while (len--) { 473 j = clpinbyte(LPMAXSPIN2, ppbus); 474 if (j == -1) { 475 goto err; 476 } 477 *bp++ = j; 478 } 479 /* Get and ignore checksum */ 480 j = clpinbyte(LPMAXSPIN2, ppbus); 481 if (j == -1) { 482 goto err; 483 } 484 485 len = bp - sc->sc_ifbuf; 486 if (len <= CLPIPHDRLEN) 487 goto err; 488 489 sc->sc_iferrs = 0; 490 491 len -= CLPIPHDRLEN; 492 sc->sc_if.if_ipackets++; 493 sc->sc_if.if_ibytes += len; 494 top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, &sc->sc_if, 0); 495 if (top) { 496 if (sc->sc_if.if_bpf) 497 lptap(&sc->sc_if, top); 498 netisr_queue(NETISR_IP, top); 499 } 500 goto done; 501 } 502 while ((ppb_rstr(ppbus) & LPIP_SHAKE)) { 503 len = sc->sc_if.if_mtu + LPIPHDRLEN; 504 bp = sc->sc_ifbuf; 505 while (len--) { 506 507 cl = ppb_rstr(ppbus); 508 ppb_wdtr(ppbus, 8); 509 510 j = LPMAXSPIN2; 511 while((ppb_rstr(ppbus) & LPIP_SHAKE)) 512 if(!--j) goto err; 513 514 c = ppb_rstr(ppbus); 515 ppb_wdtr(ppbus, 0); 516 517 *bp++= trecvh[cl] | trecvl[c]; 518 519 j = LPMAXSPIN2; 520 while (!((cl=ppb_rstr(ppbus)) & LPIP_SHAKE)) { 521 if (cl != c && 522 (((cl = ppb_rstr(ppbus)) ^ 0xb8) & 0xf8) == 523 (c & 0xf8)) 524 goto end; 525 if (!--j) goto err; 526 } 527 } 528 529 end: 530 len = bp - sc->sc_ifbuf; 531 if (len <= LPIPHDRLEN) 532 goto err; 533 534 sc->sc_iferrs = 0; 535 536 len -= LPIPHDRLEN; 537 sc->sc_if.if_ipackets++; 538 sc->sc_if.if_ibytes += len; 539 top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, &sc->sc_if, 0); 540 if (top) { 541 if (sc->sc_if.if_bpf) 542 lptap(&sc->sc_if, top); 543 netisr_queue(NETISR_IP, top); 544 } 545 } 546 goto done; 547 548 err: 549 ppb_wdtr(ppbus, 0); 550 lprintf("R"); 551 sc->sc_if.if_ierrors++; 552 sc->sc_iferrs++; 553 554 /* 555 * We are not able to send receive anything for now, 556 * so stop wasting our time 557 */ 558 if (sc->sc_iferrs > LPMAXERRS) { 559 kprintf("lp%d: Too many errors, Going off-line.\n", device_get_unit(dev)); 560 ppb_wctr(ppbus, 0x00); 561 sc->sc_if.if_flags &= ~IFF_RUNNING; 562 sc->sc_iferrs=0; 563 } 564 565 done: 566 crit_exit(); 567 return; 568 } 569 570 static __inline int 571 lpoutbyte (u_char byte, int spin, device_t ppbus) 572 { 573 ppb_wdtr(ppbus, txmith[byte]); 574 while (!(ppb_rstr(ppbus) & LPIP_SHAKE)) 575 if (--spin == 0) 576 return 1; 577 ppb_wdtr(ppbus, txmitl[byte]); 578 while (ppb_rstr(ppbus) & LPIP_SHAKE) 579 if (--spin == 0) 580 return 1; 581 return 0; 582 } 583 584 static int 585 lpoutput (struct ifnet *ifp, struct mbuf *m, 586 struct sockaddr *dst, struct rtentry *rt) 587 { 588 device_t dev = UNITODEVICE(ifp->if_dunit); 589 device_t ppbus = device_get_parent(dev); 590 int err; 591 struct mbuf *mm; 592 u_char *cp = "\0\0"; 593 u_char chksum = 0; 594 int count = 0; 595 int i, len, spin; 596 597 /* We need a sensible value if we abort */ 598 cp++; 599 ifp->if_flags |= IFF_RUNNING; 600 601 err = 1; /* assume we're aborting because of an error */ 602 603 crit_enter(); 604 605 /* Suspend (on laptops) or receive-errors might have taken us offline */ 606 ppb_wctr(ppbus, IRQENABLE); 607 608 if (ifp->if_flags & IFF_LINK0) { 609 610 if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) { 611 lprintf("&"); 612 lp_intr(dev); 613 } 614 615 /* Alert other end to pending packet */ 616 spin = LPMAXSPIN1; 617 ppb_wdtr(ppbus, 0x08); 618 while ((ppb_rstr(ppbus) & 0x08) == 0) 619 if (--spin == 0) { 620 goto nend; 621 } 622 623 /* Calculate length of packet, then send that */ 624 625 count += 14; /* Ethernet header len */ 626 627 mm = m; 628 for (mm = m; mm; mm = mm->m_next) { 629 count += mm->m_len; 630 } 631 if (clpoutbyte(count & 0xFF, LPMAXSPIN1, ppbus)) 632 goto nend; 633 if (clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, ppbus)) 634 goto nend; 635 636 /* Send dummy ethernet header */ 637 for (i = 0; i < 12; i++) { 638 if (clpoutbyte(i, LPMAXSPIN1, ppbus)) 639 goto nend; 640 chksum += i; 641 } 642 643 if (clpoutbyte(0x08, LPMAXSPIN1, ppbus)) 644 goto nend; 645 if (clpoutbyte(0x00, LPMAXSPIN1, ppbus)) 646 goto nend; 647 chksum += 0x08 + 0x00; /* Add into checksum */ 648 649 mm = m; 650 do { 651 cp = mtod(mm, u_char *); 652 len = mm->m_len; 653 while (len--) { 654 chksum += *cp; 655 if (clpoutbyte(*cp++, LPMAXSPIN2, ppbus)) 656 goto nend; 657 } 658 } while ((mm = mm->m_next)); 659 660 /* Send checksum */ 661 if (clpoutbyte(chksum, LPMAXSPIN2, ppbus)) 662 goto nend; 663 664 /* Go quiescent */ 665 ppb_wdtr(ppbus, 0); 666 667 err = 0; /* No errors */ 668 669 nend: 670 if (err) { /* if we didn't timeout... */ 671 ifp->if_oerrors++; 672 lprintf("X"); 673 } else { 674 ifp->if_opackets++; 675 ifp->if_obytes += m->m_pkthdr.len; 676 if (ifp->if_bpf) 677 lptap(ifp, m); 678 } 679 680 m_freem(m); 681 682 if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) { 683 lprintf("^"); 684 lp_intr(dev); 685 } 686 crit_exit(); 687 return 0; 688 } 689 690 if (ppb_rstr(ppbus) & LPIP_SHAKE) { 691 lprintf("&"); 692 lp_intr(dev); 693 } 694 695 if (lpoutbyte(0x08, LPMAXSPIN1, ppbus)) 696 goto end; 697 if (lpoutbyte(0x00, LPMAXSPIN2, ppbus)) 698 goto end; 699 700 mm = m; 701 do { 702 cp = mtod(mm,u_char *); 703 len = mm->m_len; 704 while (len--) 705 if (lpoutbyte(*cp++, LPMAXSPIN2, ppbus)) 706 goto end; 707 } while ((mm = mm->m_next)); 708 709 err = 0; /* no errors were encountered */ 710 711 end: 712 --cp; 713 ppb_wdtr(ppbus, txmitl[*cp] ^ 0x17); 714 715 if (err) { /* if we didn't timeout... */ 716 ifp->if_oerrors++; 717 lprintf("X"); 718 } else { 719 ifp->if_opackets++; 720 ifp->if_obytes += m->m_pkthdr.len; 721 if (ifp->if_bpf) 722 lptap(ifp, m); 723 } 724 725 m_freem(m); 726 727 if (ppb_rstr(ppbus) & LPIP_SHAKE) { 728 lprintf("^"); 729 lp_intr(dev); 730 } 731 732 crit_exit(); 733 return 0; 734 } 735 736 /* 737 * Because plip is a static device that always exists under any attached 738 * ppbus device, and not scanned by the ppbus device, we need an identify 739 * function to install the device. 740 */ 741 static device_method_t lp_methods[] = { 742 /* device interface */ 743 DEVMETHOD(device_identify, bus_generic_identify), 744 DEVMETHOD(device_probe, lp_probe), 745 DEVMETHOD(device_attach, lp_attach), 746 747 { 0, 0 } 748 }; 749 750 static driver_t lp_driver = { 751 "plip", 752 lp_methods, 753 sizeof(struct lp_data), 754 }; 755 756 DECLARE_DUMMY_MODULE(if_plip); 757 DRIVER_MODULE(if_plip, ppbus, lp_driver, lp_devclass, 0, 0); 758 759