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
lp_probe(device_t dev)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 == NULL) {
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
lp_attach(device_t dev)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
lpinittables(void)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
lpioctl(struct ifnet * ifp,u_long cmd,caddr_t data,struct ucred * cr)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, 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 == NULL) {
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
clpoutbyte(u_char byte,int spin,device_t ppbus)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
clpinbyte(int spin,device_t ppbus)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
lptap(struct ifnet * ifp,struct mbuf * m)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_gettoken();
437 if (ifp->if_bpf)
438 bpf_ptap(ifp->if_bpf, m, &af, sizeof(af));
439 bpf_reltoken();
440 }
441 }
442
443 static void
lp_intr(void * arg)444 lp_intr (void *arg)
445 {
446 device_t dev = (device_t)arg;
447 device_t ppbus = device_get_parent(dev);
448 struct lp_data *sc = DEVTOSOFTC(dev);
449 int len, j;
450 u_char *bp;
451 u_char c, cl;
452 struct mbuf *top;
453
454 crit_enter();
455
456 if (sc->sc_if.if_flags & IFF_LINK0) {
457
458 /* Ack. the request */
459 ppb_wdtr(ppbus, 0x01);
460
461 /* Get the packet length */
462 j = clpinbyte(LPMAXSPIN2, ppbus);
463 if (j == -1)
464 goto err;
465 len = j;
466 j = clpinbyte(LPMAXSPIN2, ppbus);
467 if (j == -1)
468 goto err;
469 len = len + (j << 8);
470 if (len > sc->sc_if.if_mtu + MLPIPHDRLEN)
471 goto err;
472
473 bp = sc->sc_ifbuf;
474
475 while (len--) {
476 j = clpinbyte(LPMAXSPIN2, ppbus);
477 if (j == -1) {
478 goto err;
479 }
480 *bp++ = j;
481 }
482 /* Get and ignore checksum */
483 j = clpinbyte(LPMAXSPIN2, ppbus);
484 if (j == -1) {
485 goto err;
486 }
487
488 len = bp - sc->sc_ifbuf;
489 if (len <= CLPIPHDRLEN)
490 goto err;
491
492 sc->sc_iferrs = 0;
493
494 len -= CLPIPHDRLEN;
495 IFNET_STAT_INC(&sc->sc_if, ipackets, 1);
496 IFNET_STAT_INC(&sc->sc_if, ibytes, len);
497 top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, &sc->sc_if);
498 if (top) {
499 if (sc->sc_if.if_bpf)
500 lptap(&sc->sc_if, top);
501 netisr_queue(NETISR_IP, top);
502 }
503 goto done;
504 }
505 while ((ppb_rstr(ppbus) & LPIP_SHAKE)) {
506 len = sc->sc_if.if_mtu + LPIPHDRLEN;
507 bp = sc->sc_ifbuf;
508 while (len--) {
509
510 cl = ppb_rstr(ppbus);
511 ppb_wdtr(ppbus, 8);
512
513 j = LPMAXSPIN2;
514 while((ppb_rstr(ppbus) & LPIP_SHAKE))
515 if(!--j) goto err;
516
517 c = ppb_rstr(ppbus);
518 ppb_wdtr(ppbus, 0);
519
520 *bp++= trecvh[cl] | trecvl[c];
521
522 j = LPMAXSPIN2;
523 while (!((cl=ppb_rstr(ppbus)) & LPIP_SHAKE)) {
524 if (cl != c &&
525 (((cl = ppb_rstr(ppbus)) ^ 0xb8) & 0xf8) ==
526 (c & 0xf8))
527 goto end;
528 if (!--j) goto err;
529 }
530 }
531
532 end:
533 len = bp - sc->sc_ifbuf;
534 if (len <= LPIPHDRLEN)
535 goto err;
536
537 sc->sc_iferrs = 0;
538
539 len -= LPIPHDRLEN;
540 IFNET_STAT_INC(&sc->sc_if, ipackets, 1);
541 IFNET_STAT_INC(&sc->sc_if, ibytes, len);
542 top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, &sc->sc_if);
543 if (top) {
544 if (sc->sc_if.if_bpf)
545 lptap(&sc->sc_if, top);
546 netisr_queue(NETISR_IP, top);
547 }
548 }
549 goto done;
550
551 err:
552 ppb_wdtr(ppbus, 0);
553 lprintf("R");
554 IFNET_STAT_INC(&sc->sc_if, ierrors, 1);
555 sc->sc_iferrs++;
556
557 /*
558 * We are not able to send receive anything for now,
559 * so stop wasting our time
560 */
561 if (sc->sc_iferrs > LPMAXERRS) {
562 kprintf("lp%d: Too many errors, Going off-line.\n", device_get_unit(dev));
563 ppb_wctr(ppbus, 0x00);
564 sc->sc_if.if_flags &= ~IFF_RUNNING;
565 sc->sc_iferrs=0;
566 }
567
568 done:
569 crit_exit();
570 return;
571 }
572
573 static __inline int
lpoutbyte(u_char byte,int spin,device_t ppbus)574 lpoutbyte (u_char byte, int spin, device_t ppbus)
575 {
576 ppb_wdtr(ppbus, txmith[byte]);
577 while (!(ppb_rstr(ppbus) & LPIP_SHAKE))
578 if (--spin == 0)
579 return 1;
580 ppb_wdtr(ppbus, txmitl[byte]);
581 while (ppb_rstr(ppbus) & LPIP_SHAKE)
582 if (--spin == 0)
583 return 1;
584 return 0;
585 }
586
587 static int
lpoutput(struct ifnet * ifp,struct mbuf * m,struct sockaddr * dst,struct rtentry * rt)588 lpoutput (struct ifnet *ifp, struct mbuf *m,
589 struct sockaddr *dst, struct rtentry *rt)
590 {
591 device_t dev = UNITODEVICE(ifp->if_dunit);
592 device_t ppbus = device_get_parent(dev);
593 int err;
594 struct mbuf *mm;
595 u_char *cp = "\0\0";
596 u_char chksum = 0;
597 int count = 0;
598 int i, len, spin;
599
600 /* We need a sensible value if we abort */
601 cp++;
602 ifp->if_flags |= IFF_RUNNING;
603
604 err = 1; /* assume we're aborting because of an error */
605
606 crit_enter();
607
608 /* Suspend (on laptops) or receive-errors might have taken us offline */
609 ppb_wctr(ppbus, IRQENABLE);
610
611 if (ifp->if_flags & IFF_LINK0) {
612
613 if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) {
614 lprintf("&");
615 lp_intr(dev);
616 }
617
618 /* Alert other end to pending packet */
619 spin = LPMAXSPIN1;
620 ppb_wdtr(ppbus, 0x08);
621 while ((ppb_rstr(ppbus) & 0x08) == 0)
622 if (--spin == 0) {
623 goto nend;
624 }
625
626 /* Calculate length of packet, then send that */
627
628 count += 14; /* Ethernet header len */
629
630 mm = m;
631 for (mm = m; mm; mm = mm->m_next) {
632 count += mm->m_len;
633 }
634 if (clpoutbyte(count & 0xFF, LPMAXSPIN1, ppbus))
635 goto nend;
636 if (clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, ppbus))
637 goto nend;
638
639 /* Send dummy ethernet header */
640 for (i = 0; i < 12; i++) {
641 if (clpoutbyte(i, LPMAXSPIN1, ppbus))
642 goto nend;
643 chksum += i;
644 }
645
646 if (clpoutbyte(0x08, LPMAXSPIN1, ppbus))
647 goto nend;
648 if (clpoutbyte(0x00, LPMAXSPIN1, ppbus))
649 goto nend;
650 chksum += 0x08 + 0x00; /* Add into checksum */
651
652 mm = m;
653 do {
654 cp = mtod(mm, u_char *);
655 len = mm->m_len;
656 while (len--) {
657 chksum += *cp;
658 if (clpoutbyte(*cp++, LPMAXSPIN2, ppbus))
659 goto nend;
660 }
661 } while ((mm = mm->m_next));
662
663 /* Send checksum */
664 if (clpoutbyte(chksum, LPMAXSPIN2, ppbus))
665 goto nend;
666
667 /* Go quiescent */
668 ppb_wdtr(ppbus, 0);
669
670 err = 0; /* No errors */
671
672 nend:
673 if (err) { /* if we didn't timeout... */
674 IFNET_STAT_INC(ifp, oerrors, 1);
675 lprintf("X");
676 } else {
677 IFNET_STAT_INC(ifp, opackets, 1);
678 IFNET_STAT_INC(ifp, obytes, m->m_pkthdr.len);
679 if (ifp->if_bpf)
680 lptap(ifp, m);
681 }
682
683 m_freem(m);
684
685 if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) {
686 lprintf("^");
687 lp_intr(dev);
688 }
689 crit_exit();
690 return 0;
691 }
692
693 if (ppb_rstr(ppbus) & LPIP_SHAKE) {
694 lprintf("&");
695 lp_intr(dev);
696 }
697
698 if (lpoutbyte(0x08, LPMAXSPIN1, ppbus))
699 goto end;
700 if (lpoutbyte(0x00, LPMAXSPIN2, ppbus))
701 goto end;
702
703 mm = m;
704 do {
705 cp = mtod(mm,u_char *);
706 len = mm->m_len;
707 while (len--)
708 if (lpoutbyte(*cp++, LPMAXSPIN2, ppbus))
709 goto end;
710 } while ((mm = mm->m_next));
711
712 err = 0; /* no errors were encountered */
713
714 end:
715 --cp;
716 ppb_wdtr(ppbus, txmitl[*cp] ^ 0x17);
717
718 if (err) { /* if we didn't timeout... */
719 IFNET_STAT_INC(ifp, oerrors, 1);
720 lprintf("X");
721 } else {
722 IFNET_STAT_INC(ifp, opackets, 1);
723 IFNET_STAT_INC(ifp, obytes, m->m_pkthdr.len);
724 if (ifp->if_bpf)
725 lptap(ifp, m);
726 }
727
728 m_freem(m);
729
730 if (ppb_rstr(ppbus) & LPIP_SHAKE) {
731 lprintf("^");
732 lp_intr(dev);
733 }
734
735 crit_exit();
736 return 0;
737 }
738
739 /*
740 * Because plip is a static device that always exists under any attached
741 * ppbus device, and not scanned by the ppbus device, we need an identify
742 * function to install the device.
743 */
744 static device_method_t lp_methods[] = {
745 /* device interface */
746 DEVMETHOD(device_identify, bus_generic_identify),
747 DEVMETHOD(device_probe, lp_probe),
748 DEVMETHOD(device_attach, lp_attach),
749
750 DEVMETHOD_END
751 };
752
753 static driver_t lp_driver = {
754 "plip",
755 lp_methods,
756 sizeof(struct lp_data),
757 };
758
759 DECLARE_DUMMY_MODULE(if_plip);
760 DRIVER_MODULE(if_plip, ppbus, lp_driver, lp_devclass, NULL, NULL);
761
762