if_plip.c revision 131882 
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 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: head/sys/dev/ppbus/if_plip.c 131882 2004-07-09 16:56:46Z cognet $");
31
32/*
33 * Parallel port TCP/IP interfaces added.  I looked at the driver from
34 * MACH but this is a complete rewrite, and btw. incompatible, and it
35 * should perform better too.  I have never run the MACH driver though.
36 *
37 * This driver sends two bytes (0x08, 0x00) in front of each packet,
38 * to allow us to distinguish another format later.
39 *
40 * Now added a Linux/Crynwr compatibility mode which is enabled using
41 * IF_LINK0 - Tim Wilkinson.
42 *
43 * TODO:
44 *    Make HDLC/PPP mode, use IF_LLC1 to enable.
45 *
46 * Connect the two computers using a Laplink parallel cable to use this
47 * feature:
48 *
49 *      +----------------------------------------+
50 * 	|A-name	A-End	B-End	Descr.	Port/Bit |
51 *      +----------------------------------------+
52 *	|DATA0	2	15	Data	0/0x01   |
53 *	|-ERROR	15	2	   	1/0x08   |
54 *      +----------------------------------------+
55 *	|DATA1	3	13	Data	0/0x02	 |
56 *	|+SLCT	13	3	   	1/0x10   |
57 *      +----------------------------------------+
58 *	|DATA2	4	12	Data	0/0x04   |
59 *	|+PE	12	4	   	1/0x20   |
60 *      +----------------------------------------+
61 *	|DATA3	5	10	Strobe	0/0x08   |
62 *	|-ACK	10	5	   	1/0x40   |
63 *      +----------------------------------------+
64 *	|DATA4	6	11	Data	0/0x10   |
65 *	|BUSY	11	6	   	1/~0x80  |
66 *      +----------------------------------------+
67 *	|GND	18-25	18-25	GND	-        |
68 *      +----------------------------------------+
69 *
70 * Expect transfer-rates up to 75 kbyte/sec.
71 *
72 * If GCC could correctly grok
73 *	register int port asm("edx")
74 * the code would be cleaner
75 *
76 * Poul-Henning Kamp <phk@freebsd.org>
77 */
78
79/*
80 * Update for ppbus, PLIP support only - Nicolas Souchu
81 */
82
83#include "opt_plip.h"
84
85#include <sys/param.h>
86#include <sys/systm.h>
87#include <sys/module.h>
88#include <sys/bus.h>
89#include <sys/mbuf.h>
90#include <sys/socket.h>
91#include <sys/sockio.h>
92#include <sys/kernel.h>
93#include <sys/malloc.h>
94
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 <dev/ppbus/ppbconf.h>
109#include "ppbus_if.h"
110#include <dev/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
143static int volatile lptflag = 1;
144#else
145static int volatile lptflag = 0;
146#endif
147
148struct lp_data {
149	struct  ifnet	sc_if;
150	u_char		*sc_ifbuf;
151	int		sc_iferrs;
152
153	struct resource *res_irq;
154};
155
156/* Tables for the lp# interface */
157static u_char *txmith;
158#define txmitl (txmith+(1*LPIPTBLSIZE))
159#define trecvh (txmith+(2*LPIPTBLSIZE))
160#define trecvl (txmith+(3*LPIPTBLSIZE))
161
162static u_char *ctxmith;
163#define ctxmitl (ctxmith+(1*LPIPTBLSIZE))
164#define ctrecvh (ctxmith+(2*LPIPTBLSIZE))
165#define ctrecvl (ctxmith+(3*LPIPTBLSIZE))
166
167/* Functions for the lp# interface */
168static int lpinittables(void);
169static int lpioctl(struct ifnet *, u_long, caddr_t);
170static int lpoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
171	struct rtentry *);
172static void lp_intr(void *);
173
174#define DEVTOSOFTC(dev) \
175	((struct lp_data *)device_get_softc(dev))
176#define UNITOSOFTC(unit) \
177	((struct lp_data *)devclass_get_softc(lp_devclass, (unit)))
178#define UNITODEVICE(unit) \
179	(devclass_get_device(lp_devclass, (unit)))
180
181static devclass_t lp_devclass;
182
183static void
184lp_identify(driver_t *driver, device_t parent)
185{
186	device_t dev;
187
188	dev = device_find_child(parent, "plip", 0);
189	if (!dev)
190		BUS_ADD_CHILD(parent, 0, "plip", -1);
191}
192/*
193 * lpprobe()
194 */
195static int
196lp_probe(device_t dev)
197{
198	device_t ppbus = device_get_parent(dev);
199	struct lp_data *lp;
200	int zero = 0;
201	uintptr_t irq;
202
203	lp = DEVTOSOFTC(dev);
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
226	device_set_desc(dev, "PLIP network interface");
227
228	return (0);
229}
230
231static int
232lp_attach (device_t dev)
233{
234	struct lp_data *lp = DEVTOSOFTC(dev);
235	struct ifnet *ifp = &lp->sc_if;
236
237	ifp->if_softc = lp;
238	if_initname(ifp, device_get_name(dev), device_get_unit(dev));
239	ifp->if_mtu = LPMTU;
240	ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST;
241	ifp->if_ioctl = lpioctl;
242	ifp->if_output = lpoutput;
243	ifp->if_type = IFT_PARA;
244	ifp->if_hdrlen = 0;
245	ifp->if_addrlen = 0;
246	ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
247	if_attach(ifp);
248
249	bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
250
251	return (0);
252}
253/*
254 * Build the translation tables for the LPIP (BSD unix) protocol.
255 * We don't want to calculate these nasties in our tight loop, so we
256 * precalculate them when we initialize.
257 */
258static int
259lpinittables (void)
260{
261    int i;
262
263    if (!txmith)
264	txmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT);
265
266    if (!txmith)
267	return 1;
268
269    if (!ctxmith)
270	ctxmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT);
271
272    if (!ctxmith)
273	return 1;
274
275    for (i=0; i < LPIPTBLSIZE; i++) {
276	ctxmith[i] = (i & 0xF0) >> 4;
277	ctxmitl[i] = 0x10 | (i & 0x0F);
278	ctrecvh[i] = (i & 0x78) << 1;
279	ctrecvl[i] = (i & 0x78) >> 3;
280    }
281
282    for (i=0; i < LPIPTBLSIZE; i++) {
283	txmith[i] = ((i & 0x80) >> 3) | ((i & 0x70) >> 4) | 0x08;
284	txmitl[i] = ((i & 0x08) << 1) | (i & 0x07);
285	trecvh[i] = ((~i) & 0x80) | ((i & 0x38) << 1);
286	trecvl[i] = (((~i) & 0x80) >> 4) | ((i & 0x38) >> 3);
287    }
288
289    return 0;
290}
291
292/*
293 * Process an ioctl request.
294 */
295
296static int
297lpioctl (struct ifnet *ifp, u_long cmd, caddr_t data)
298{
299    device_t dev = UNITODEVICE(ifp->if_dunit);
300    device_t ppbus = device_get_parent(dev);
301    struct lp_data *sc = DEVTOSOFTC(dev);
302    struct ifaddr *ifa = (struct ifaddr *)data;
303    struct ifreq *ifr = (struct ifreq *)data;
304    u_char *ptr;
305    void *ih;
306    int error;
307
308    switch (cmd) {
309
310    case SIOCSIFDSTADDR:
311    case SIOCAIFADDR:
312    case SIOCSIFADDR:
313	if (ifa->ifa_addr->sa_family != AF_INET)
314	    return EAFNOSUPPORT;
315
316	ifp->if_flags |= IFF_UP;
317	/* FALLTHROUGH */
318    case SIOCSIFFLAGS:
319	if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) {
320
321	    ppb_wctr(ppbus, 0x00);
322	    ifp->if_flags &= ~IFF_RUNNING;
323
324	    /* IFF_UP is not set, try to release the bus anyway */
325	    ppb_release_bus(ppbus, dev);
326	    break;
327	}
328	if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) {
329
330	    /* XXX
331	     * Should the request be interruptible?
332	     */
333	    if ((error = ppb_request_bus(ppbus, dev, PPB_WAIT|PPB_INTR)))
334		return (error);
335
336	    /* Now IFF_UP means that we own the bus */
337
338	    ppb_set_mode(ppbus, PPB_COMPATIBLE);
339
340	    if (lpinittables()) {
341		ppb_release_bus(ppbus, dev);
342		return ENOBUFS;
343	    }
344
345	    sc->sc_ifbuf = malloc(sc->sc_if.if_mtu + MLPIPHDRLEN,
346				  M_DEVBUF, M_WAITOK);
347	    if (!sc->sc_ifbuf) {
348		ppb_release_bus(ppbus, dev);
349		return ENOBUFS;
350	    }
351
352	    /* attach our interrupt handler, later detached when the bus is released */
353	    if ((error = BUS_SETUP_INTR(ppbus, dev, sc->res_irq,
354					INTR_TYPE_NET, lp_intr, dev, &ih))) {
355		ppb_release_bus(ppbus, dev);
356		return (error);
357	    }
358
359	    ppb_wctr(ppbus, IRQENABLE);
360	    ifp->if_flags |= IFF_RUNNING;
361	}
362	break;
363
364    case SIOCSIFMTU:
365	ptr = sc->sc_ifbuf;
366	sc->sc_ifbuf = malloc(ifr->ifr_mtu+MLPIPHDRLEN, M_DEVBUF, M_NOWAIT);
367	if (!sc->sc_ifbuf) {
368	    sc->sc_ifbuf = ptr;
369	    return ENOBUFS;
370	}
371	if (ptr)
372	    free(ptr,M_DEVBUF);
373	sc->sc_if.if_mtu = ifr->ifr_mtu;
374	break;
375
376    case SIOCGIFMTU:
377	ifr->ifr_mtu = sc->sc_if.if_mtu;
378	break;
379
380    case SIOCADDMULTI:
381    case SIOCDELMULTI:
382	if (ifr == 0) {
383	    return EAFNOSUPPORT;		/* XXX */
384	}
385	switch (ifr->ifr_addr.sa_family) {
386
387	case AF_INET:
388	    break;
389
390	default:
391	    return EAFNOSUPPORT;
392	}
393	break;
394
395    case SIOCGIFMEDIA:
396	/*
397	 * No ifmedia support at this stage; maybe use it
398	 * in future for eg. protocol selection.
399	 */
400	return EINVAL;
401
402    default:
403	lprintf("LP:ioctl(0x%lx)\n", cmd);
404	return EINVAL;
405    }
406    return 0;
407}
408
409static __inline int
410clpoutbyte (u_char byte, int spin, device_t ppbus)
411{
412	ppb_wdtr(ppbus, ctxmitl[byte]);
413	while (ppb_rstr(ppbus) & CLPIP_SHAKE)
414		if (--spin == 0) {
415			return 1;
416		}
417	ppb_wdtr(ppbus, ctxmith[byte]);
418	while (!(ppb_rstr(ppbus) & CLPIP_SHAKE))
419		if (--spin == 0) {
420			return 1;
421		}
422	return 0;
423}
424
425static __inline int
426clpinbyte (int spin, device_t ppbus)
427{
428	u_char c, cl;
429
430	while((ppb_rstr(ppbus) & CLPIP_SHAKE))
431	    if(!--spin) {
432		return -1;
433	    }
434	cl = ppb_rstr(ppbus);
435	ppb_wdtr(ppbus, 0x10);
436
437	while(!(ppb_rstr(ppbus) & CLPIP_SHAKE))
438	    if(!--spin) {
439		return -1;
440	    }
441	c = ppb_rstr(ppbus);
442	ppb_wdtr(ppbus, 0x00);
443
444	return (ctrecvl[cl] | ctrecvh[c]);
445}
446
447static void
448lptap(struct ifnet *ifp, struct mbuf *m)
449{
450	u_int32_t af = AF_INET;
451	BPF_MTAP2(ifp, &af, sizeof(af), m);
452}
453
454static void
455lp_intr (void *arg)
456{
457	device_t dev = (device_t)arg;
458        device_t ppbus = device_get_parent(dev);
459	struct lp_data *sc = DEVTOSOFTC(dev);
460	int len, s, j;
461	u_char *bp;
462	u_char c, cl;
463	struct mbuf *top;
464
465	s = splhigh();
466
467	if (sc->sc_if.if_flags & IFF_LINK0) {
468
469	    /* Ack. the request */
470	    ppb_wdtr(ppbus, 0x01);
471
472	    /* Get the packet length */
473	    j = clpinbyte(LPMAXSPIN2, ppbus);
474	    if (j == -1)
475		goto err;
476	    len = j;
477	    j = clpinbyte(LPMAXSPIN2, ppbus);
478	    if (j == -1)
479		goto err;
480	    len = len + (j << 8);
481	    if (len > sc->sc_if.if_mtu + MLPIPHDRLEN)
482		goto err;
483
484	    bp  = sc->sc_ifbuf;
485
486	    while (len--) {
487	        j = clpinbyte(LPMAXSPIN2, ppbus);
488	        if (j == -1) {
489		    goto err;
490	        }
491	        *bp++ = j;
492	    }
493	    /* Get and ignore checksum */
494	    j = clpinbyte(LPMAXSPIN2, ppbus);
495	    if (j == -1) {
496	        goto err;
497	    }
498
499	    len = bp - sc->sc_ifbuf;
500	    if (len <= CLPIPHDRLEN)
501	        goto err;
502
503	    sc->sc_iferrs = 0;
504
505	    len -= CLPIPHDRLEN;
506	    sc->sc_if.if_ipackets++;
507	    sc->sc_if.if_ibytes += len;
508	    top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, &sc->sc_if, 0);
509	    if (top) {
510		if (sc->sc_if.if_bpf)
511		    lptap(&sc->sc_if, top);
512		netisr_queue(NETISR_IP, top);
513	    }
514	    goto done;
515	}
516	while ((ppb_rstr(ppbus) & LPIP_SHAKE)) {
517	    len = sc->sc_if.if_mtu + LPIPHDRLEN;
518	    bp  = sc->sc_ifbuf;
519	    while (len--) {
520
521		cl = ppb_rstr(ppbus);
522		ppb_wdtr(ppbus, 8);
523
524		j = LPMAXSPIN2;
525		while((ppb_rstr(ppbus) & LPIP_SHAKE))
526		    if(!--j) goto err;
527
528		c = ppb_rstr(ppbus);
529		ppb_wdtr(ppbus, 0);
530
531		*bp++= trecvh[cl] | trecvl[c];
532
533		j = LPMAXSPIN2;
534		while (!((cl=ppb_rstr(ppbus)) & LPIP_SHAKE)) {
535		    if (cl != c &&
536			(((cl = ppb_rstr(ppbus)) ^ 0xb8) & 0xf8) ==
537			  (c & 0xf8))
538			goto end;
539		    if (!--j) goto err;
540		}
541	    }
542
543	end:
544	    len = bp - sc->sc_ifbuf;
545	    if (len <= LPIPHDRLEN)
546		goto err;
547
548	    sc->sc_iferrs = 0;
549
550	    len -= LPIPHDRLEN;
551	    sc->sc_if.if_ipackets++;
552	    sc->sc_if.if_ibytes += len;
553	    top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, &sc->sc_if, 0);
554	    if (top) {
555		if (sc->sc_if.if_bpf)
556		    lptap(&sc->sc_if, top);
557		netisr_queue(NETISR_IP, top);
558	    }
559	}
560	goto done;
561
562    err:
563	ppb_wdtr(ppbus, 0);
564	lprintf("R");
565	sc->sc_if.if_ierrors++;
566	sc->sc_iferrs++;
567
568	/*
569	 * We are not able to send receive anything for now,
570	 * so stop wasting our time
571	 */
572	if (sc->sc_iferrs > LPMAXERRS) {
573	    printf("lp%d: Too many errors, Going off-line.\n", device_get_unit(dev));
574	    ppb_wctr(ppbus, 0x00);
575	    sc->sc_if.if_flags &= ~IFF_RUNNING;
576	    sc->sc_iferrs=0;
577	}
578
579    done:
580	splx(s);
581	return;
582}
583
584static __inline int
585lpoutbyte (u_char byte, int spin, device_t ppbus)
586{
587    ppb_wdtr(ppbus, txmith[byte]);
588    while (!(ppb_rstr(ppbus) & LPIP_SHAKE))
589	if (--spin == 0)
590		return 1;
591    ppb_wdtr(ppbus, txmitl[byte]);
592    while (ppb_rstr(ppbus) & LPIP_SHAKE)
593	if (--spin == 0)
594		return 1;
595    return 0;
596}
597
598static int
599lpoutput (struct ifnet *ifp, struct mbuf *m,
600	  struct sockaddr *dst, struct rtentry *rt)
601{
602    device_t dev = UNITODEVICE(ifp->if_dunit);
603    device_t ppbus = device_get_parent(dev);
604    int s, err;
605    struct mbuf *mm;
606    u_char *cp = "\0\0";
607    u_char chksum = 0;
608    int count = 0;
609    int i, len, spin;
610
611    /* We need a sensible value if we abort */
612    cp++;
613    ifp->if_flags |= IFF_RUNNING;
614
615    err = 1;			/* assume we're aborting because of an error */
616
617    s = splhigh();
618
619    /* Suspend (on laptops) or receive-errors might have taken us offline */
620    ppb_wctr(ppbus, IRQENABLE);
621
622    if (ifp->if_flags & IFF_LINK0) {
623
624	if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) {
625	    lprintf("&");
626	    lp_intr(dev);
627	}
628
629	/* Alert other end to pending packet */
630	spin = LPMAXSPIN1;
631	ppb_wdtr(ppbus, 0x08);
632	while ((ppb_rstr(ppbus) & 0x08) == 0)
633		if (--spin == 0) {
634			goto nend;
635		}
636
637	/* Calculate length of packet, then send that */
638
639	count += 14;		/* Ethernet header len */
640
641	mm = m;
642	for (mm = m; mm; mm = mm->m_next) {
643		count += mm->m_len;
644	}
645	if (clpoutbyte(count & 0xFF, LPMAXSPIN1, ppbus))
646		goto nend;
647	if (clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, ppbus))
648		goto nend;
649
650	/* Send dummy ethernet header */
651	for (i = 0; i < 12; i++) {
652		if (clpoutbyte(i, LPMAXSPIN1, ppbus))
653			goto nend;
654		chksum += i;
655	}
656
657	if (clpoutbyte(0x08, LPMAXSPIN1, ppbus))
658		goto nend;
659	if (clpoutbyte(0x00, LPMAXSPIN1, ppbus))
660		goto nend;
661	chksum += 0x08 + 0x00;		/* Add into checksum */
662
663	mm = m;
664	do {
665		cp = mtod(mm, u_char *);
666		len = mm->m_len;
667		while (len--) {
668			chksum += *cp;
669			if (clpoutbyte(*cp++, LPMAXSPIN2, ppbus))
670				goto nend;
671		}
672	} while ((mm = mm->m_next));
673
674	/* Send checksum */
675	if (clpoutbyte(chksum, LPMAXSPIN2, ppbus))
676		goto nend;
677
678	/* Go quiescent */
679	ppb_wdtr(ppbus, 0);
680
681	err = 0;			/* No errors */
682
683	nend:
684	if (err)  {				/* if we didn't timeout... */
685		ifp->if_oerrors++;
686		lprintf("X");
687	} else {
688		ifp->if_opackets++;
689		ifp->if_obytes += m->m_pkthdr.len;
690		if (ifp->if_bpf)
691		    lptap(ifp, m);
692	}
693
694	m_freem(m);
695
696	if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) {
697		lprintf("^");
698		lp_intr(dev);
699	}
700	(void) splx(s);
701	return 0;
702    }
703
704    if (ppb_rstr(ppbus) & LPIP_SHAKE) {
705        lprintf("&");
706        lp_intr(dev);
707    }
708
709    if (lpoutbyte(0x08, LPMAXSPIN1, ppbus))
710        goto end;
711    if (lpoutbyte(0x00, LPMAXSPIN2, ppbus))
712        goto end;
713
714    mm = m;
715    do {
716        cp = mtod(mm,u_char *);
717	len = mm->m_len;
718        while (len--)
719	    if (lpoutbyte(*cp++, LPMAXSPIN2, ppbus))
720	        goto end;
721    } while ((mm = mm->m_next));
722
723    err = 0;				/* no errors were encountered */
724
725    end:
726    --cp;
727    ppb_wdtr(ppbus, txmitl[*cp] ^ 0x17);
728
729    if (err)  {				/* if we didn't timeout... */
730	ifp->if_oerrors++;
731        lprintf("X");
732    } else {
733	ifp->if_opackets++;
734	ifp->if_obytes += m->m_pkthdr.len;
735	if (ifp->if_bpf)
736	    lptap(ifp, m);
737    }
738
739    m_freem(m);
740
741    if (ppb_rstr(ppbus) & LPIP_SHAKE) {
742	lprintf("^");
743	lp_intr(dev);
744    }
745
746    (void) splx(s);
747    return 0;
748}
749
750static device_method_t lp_methods[] = {
751  	/* device interface */
752	DEVMETHOD(device_identify,	lp_identify),
753	DEVMETHOD(device_probe,		lp_probe),
754	DEVMETHOD(device_attach,	lp_attach),
755
756	{ 0, 0 }
757};
758
759static driver_t lp_driver = {
760  "plip",
761  lp_methods,
762  sizeof(struct lp_data),
763};
764
765DRIVER_MODULE(plip, ppbus, lp_driver, lp_devclass, 0, 0);
766