if_plip.c revision 127189 
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 127189 2004-03-18 21:10:11Z guido $");
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	bzero(lp, sizeof(struct lp_data));
205
206	/* retrieve the ppbus irq */
207	BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq);
208
209	/* if we haven't interrupts, the probe fails */
210	if (irq == -1) {
211		device_printf(dev, "not an interrupt driven port, failed.\n");
212		return (ENXIO);
213	}
214
215	/* reserve the interrupt resource, expecting irq is available to continue */
216	lp->res_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &zero, irq, irq, 1,
217					 RF_SHAREABLE);
218	if (lp->res_irq == 0) {
219		device_printf(dev, "cannot reserve interrupt, failed.\n");
220		return (ENXIO);
221	}
222
223	/*
224	 * lp dependent initialisation.
225	 */
226
227	device_set_desc(dev, "PLIP network interface");
228
229	return (0);
230}
231
232static int
233lp_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, device_get_name(dev), 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 */
259static int
260lpinittables (void)
261{
262    int i;
263
264    if (!txmith)
265	txmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT);
266
267    if (!txmith)
268	return 1;
269
270    if (!ctxmith)
271	ctxmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT);
272
273    if (!ctxmith)
274	return 1;
275
276    for (i=0; i < LPIPTBLSIZE; i++) {
277	ctxmith[i] = (i & 0xF0) >> 4;
278	ctxmitl[i] = 0x10 | (i & 0x0F);
279	ctrecvh[i] = (i & 0x78) << 1;
280	ctrecvl[i] = (i & 0x78) >> 3;
281    }
282
283    for (i=0; i < LPIPTBLSIZE; i++) {
284	txmith[i] = ((i & 0x80) >> 3) | ((i & 0x70) >> 4) | 0x08;
285	txmitl[i] = ((i & 0x08) << 1) | (i & 0x07);
286	trecvh[i] = ((~i) & 0x80) | ((i & 0x38) << 1);
287	trecvl[i] = (((~i) & 0x80) >> 4) | ((i & 0x38) >> 3);
288    }
289
290    return 0;
291}
292
293/*
294 * Process an ioctl request.
295 */
296
297static int
298lpioctl (struct ifnet *ifp, u_long cmd, caddr_t data)
299{
300    device_t dev = UNITODEVICE(ifp->if_dunit);
301    device_t ppbus = device_get_parent(dev);
302    struct lp_data *sc = DEVTOSOFTC(dev);
303    struct ifaddr *ifa = (struct ifaddr *)data;
304    struct ifreq *ifr = (struct ifreq *)data;
305    u_char *ptr;
306    void *ih;
307    int error;
308
309    switch (cmd) {
310
311    case SIOCSIFDSTADDR:
312    case SIOCAIFADDR:
313    case SIOCSIFADDR:
314	if (ifa->ifa_addr->sa_family != AF_INET)
315	    return EAFNOSUPPORT;
316
317	ifp->if_flags |= IFF_UP;
318	/* FALLTHROUGH */
319    case SIOCSIFFLAGS:
320	if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) {
321
322	    ppb_wctr(ppbus, 0x00);
323	    ifp->if_flags &= ~IFF_RUNNING;
324
325	    /* IFF_UP is not set, try to release the bus anyway */
326	    ppb_release_bus(ppbus, dev);
327	    break;
328	}
329	if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) {
330
331	    /* XXX
332	     * Should the request be interruptible?
333	     */
334	    if ((error = ppb_request_bus(ppbus, dev, PPB_WAIT|PPB_INTR)))
335		return (error);
336
337	    /* Now IFF_UP means that we own the bus */
338
339	    ppb_set_mode(ppbus, PPB_COMPATIBLE);
340
341	    if (lpinittables()) {
342		ppb_release_bus(ppbus, dev);
343		return ENOBUFS;
344	    }
345
346	    sc->sc_ifbuf = malloc(sc->sc_if.if_mtu + MLPIPHDRLEN,
347				  M_DEVBUF, M_WAITOK);
348	    if (!sc->sc_ifbuf) {
349		ppb_release_bus(ppbus, dev);
350		return ENOBUFS;
351	    }
352
353	    /* attach our interrupt handler, later detached when the bus is released */
354	    if ((error = BUS_SETUP_INTR(ppbus, dev, sc->res_irq,
355					INTR_TYPE_NET, lp_intr, dev, &ih))) {
356		ppb_release_bus(ppbus, dev);
357		return (error);
358	    }
359
360	    ppb_wctr(ppbus, IRQENABLE);
361	    ifp->if_flags |= IFF_RUNNING;
362	}
363	break;
364
365    case SIOCSIFMTU:
366	ptr = sc->sc_ifbuf;
367	sc->sc_ifbuf = malloc(ifr->ifr_mtu+MLPIPHDRLEN, M_DEVBUF, M_NOWAIT);
368	if (!sc->sc_ifbuf) {
369	    sc->sc_ifbuf = ptr;
370	    return ENOBUFS;
371	}
372	if (ptr)
373	    free(ptr,M_DEVBUF);
374	sc->sc_if.if_mtu = ifr->ifr_mtu;
375	break;
376
377    case SIOCGIFMTU:
378	ifr->ifr_mtu = sc->sc_if.if_mtu;
379	break;
380
381    case SIOCADDMULTI:
382    case SIOCDELMULTI:
383	if (ifr == 0) {
384	    return EAFNOSUPPORT;		/* XXX */
385	}
386	switch (ifr->ifr_addr.sa_family) {
387
388	case AF_INET:
389	    break;
390
391	default:
392	    return EAFNOSUPPORT;
393	}
394	break;
395
396    case SIOCGIFMEDIA:
397	/*
398	 * No ifmedia support at this stage; maybe use it
399	 * in future for eg. protocol selection.
400	 */
401	return EINVAL;
402
403    default:
404	lprintf("LP:ioctl(0x%lx)\n", cmd);
405	return EINVAL;
406    }
407    return 0;
408}
409
410static __inline int
411clpoutbyte (u_char byte, int spin, device_t ppbus)
412{
413	ppb_wdtr(ppbus, ctxmitl[byte]);
414	while (ppb_rstr(ppbus) & CLPIP_SHAKE)
415		if (--spin == 0) {
416			return 1;
417		}
418	ppb_wdtr(ppbus, ctxmith[byte]);
419	while (!(ppb_rstr(ppbus) & CLPIP_SHAKE))
420		if (--spin == 0) {
421			return 1;
422		}
423	return 0;
424}
425
426static __inline int
427clpinbyte (int spin, device_t ppbus)
428{
429	u_char c, cl;
430
431	while((ppb_rstr(ppbus) & CLPIP_SHAKE))
432	    if(!--spin) {
433		return -1;
434	    }
435	cl = ppb_rstr(ppbus);
436	ppb_wdtr(ppbus, 0x10);
437
438	while(!(ppb_rstr(ppbus) & CLPIP_SHAKE))
439	    if(!--spin) {
440		return -1;
441	    }
442	c = ppb_rstr(ppbus);
443	ppb_wdtr(ppbus, 0x00);
444
445	return (ctrecvl[cl] | ctrecvh[c]);
446}
447
448static void
449lptap(struct ifnet *ifp, struct mbuf *m)
450{
451	u_int32_t af = AF_INET;
452	BPF_MTAP2(ifp, &af, sizeof(af), m);
453}
454
455static void
456lp_intr (void *arg)
457{
458	device_t dev = (device_t)arg;
459        device_t ppbus = device_get_parent(dev);
460	struct lp_data *sc = DEVTOSOFTC(dev);
461	int len, s, j;
462	u_char *bp;
463	u_char c, cl;
464	struct mbuf *top;
465
466	s = splhigh();
467
468	if (sc->sc_if.if_flags & IFF_LINK0) {
469
470	    /* Ack. the request */
471	    ppb_wdtr(ppbus, 0x01);
472
473	    /* Get the packet length */
474	    j = clpinbyte(LPMAXSPIN2, ppbus);
475	    if (j == -1)
476		goto err;
477	    len = j;
478	    j = clpinbyte(LPMAXSPIN2, ppbus);
479	    if (j == -1)
480		goto err;
481	    len = len + (j << 8);
482	    if (len > sc->sc_if.if_mtu + MLPIPHDRLEN)
483		goto err;
484
485	    bp  = sc->sc_ifbuf;
486
487	    while (len--) {
488	        j = clpinbyte(LPMAXSPIN2, ppbus);
489	        if (j == -1) {
490		    goto err;
491	        }
492	        *bp++ = j;
493	    }
494	    /* Get and ignore checksum */
495	    j = clpinbyte(LPMAXSPIN2, ppbus);
496	    if (j == -1) {
497	        goto err;
498	    }
499
500	    len = bp - sc->sc_ifbuf;
501	    if (len <= CLPIPHDRLEN)
502	        goto err;
503
504	    sc->sc_iferrs = 0;
505
506	    len -= CLPIPHDRLEN;
507	    sc->sc_if.if_ipackets++;
508	    sc->sc_if.if_ibytes += len;
509	    top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, &sc->sc_if, 0);
510	    if (top) {
511		if (sc->sc_if.if_bpf)
512		    lptap(&sc->sc_if, top);
513		netisr_queue(NETISR_IP, top);
514	    }
515	    goto done;
516	}
517	while ((ppb_rstr(ppbus) & LPIP_SHAKE)) {
518	    len = sc->sc_if.if_mtu + LPIPHDRLEN;
519	    bp  = sc->sc_ifbuf;
520	    while (len--) {
521
522		cl = ppb_rstr(ppbus);
523		ppb_wdtr(ppbus, 8);
524
525		j = LPMAXSPIN2;
526		while((ppb_rstr(ppbus) & LPIP_SHAKE))
527		    if(!--j) goto err;
528
529		c = ppb_rstr(ppbus);
530		ppb_wdtr(ppbus, 0);
531
532		*bp++= trecvh[cl] | trecvl[c];
533
534		j = LPMAXSPIN2;
535		while (!((cl=ppb_rstr(ppbus)) & LPIP_SHAKE)) {
536		    if (cl != c &&
537			(((cl = ppb_rstr(ppbus)) ^ 0xb8) & 0xf8) ==
538			  (c & 0xf8))
539			goto end;
540		    if (!--j) goto err;
541		}
542	    }
543
544	end:
545	    len = bp - sc->sc_ifbuf;
546	    if (len <= LPIPHDRLEN)
547		goto err;
548
549	    sc->sc_iferrs = 0;
550
551	    len -= LPIPHDRLEN;
552	    sc->sc_if.if_ipackets++;
553	    sc->sc_if.if_ibytes += len;
554	    top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, &sc->sc_if, 0);
555	    if (top) {
556		if (sc->sc_if.if_bpf)
557		    lptap(&sc->sc_if, top);
558		netisr_queue(NETISR_IP, top);
559	    }
560	}
561	goto done;
562
563    err:
564	ppb_wdtr(ppbus, 0);
565	lprintf("R");
566	sc->sc_if.if_ierrors++;
567	sc->sc_iferrs++;
568
569	/*
570	 * We are not able to send receive anything for now,
571	 * so stop wasting our time
572	 */
573	if (sc->sc_iferrs > LPMAXERRS) {
574	    printf("lp%d: Too many errors, Going off-line.\n", device_get_unit(dev));
575	    ppb_wctr(ppbus, 0x00);
576	    sc->sc_if.if_flags &= ~IFF_RUNNING;
577	    sc->sc_iferrs=0;
578	}
579
580    done:
581	splx(s);
582	return;
583}
584
585static __inline int
586lpoutbyte (u_char byte, int spin, device_t ppbus)
587{
588    ppb_wdtr(ppbus, txmith[byte]);
589    while (!(ppb_rstr(ppbus) & LPIP_SHAKE))
590	if (--spin == 0)
591		return 1;
592    ppb_wdtr(ppbus, txmitl[byte]);
593    while (ppb_rstr(ppbus) & LPIP_SHAKE)
594	if (--spin == 0)
595		return 1;
596    return 0;
597}
598
599static int
600lpoutput (struct ifnet *ifp, struct mbuf *m,
601	  struct sockaddr *dst, struct rtentry *rt)
602{
603    device_t dev = UNITODEVICE(ifp->if_dunit);
604    device_t ppbus = device_get_parent(dev);
605    int s, err;
606    struct mbuf *mm;
607    u_char *cp = "\0\0";
608    u_char chksum = 0;
609    int count = 0;
610    int i, len, spin;
611
612    /* We need a sensible value if we abort */
613    cp++;
614    ifp->if_flags |= IFF_RUNNING;
615
616    err = 1;			/* assume we're aborting because of an error */
617
618    s = splhigh();
619
620    /* Suspend (on laptops) or receive-errors might have taken us offline */
621    ppb_wctr(ppbus, IRQENABLE);
622
623    if (ifp->if_flags & IFF_LINK0) {
624
625	if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) {
626	    lprintf("&");
627	    lp_intr(dev);
628	}
629
630	/* Alert other end to pending packet */
631	spin = LPMAXSPIN1;
632	ppb_wdtr(ppbus, 0x08);
633	while ((ppb_rstr(ppbus) & 0x08) == 0)
634		if (--spin == 0) {
635			goto nend;
636		}
637
638	/* Calculate length of packet, then send that */
639
640	count += 14;		/* Ethernet header len */
641
642	mm = m;
643	for (mm = m; mm; mm = mm->m_next) {
644		count += mm->m_len;
645	}
646	if (clpoutbyte(count & 0xFF, LPMAXSPIN1, ppbus))
647		goto nend;
648	if (clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, ppbus))
649		goto nend;
650
651	/* Send dummy ethernet header */
652	for (i = 0; i < 12; i++) {
653		if (clpoutbyte(i, LPMAXSPIN1, ppbus))
654			goto nend;
655		chksum += i;
656	}
657
658	if (clpoutbyte(0x08, LPMAXSPIN1, ppbus))
659		goto nend;
660	if (clpoutbyte(0x00, LPMAXSPIN1, ppbus))
661		goto nend;
662	chksum += 0x08 + 0x00;		/* Add into checksum */
663
664	mm = m;
665	do {
666		cp = mtod(mm, u_char *);
667		len = mm->m_len;
668		while (len--) {
669			chksum += *cp;
670			if (clpoutbyte(*cp++, LPMAXSPIN2, ppbus))
671				goto nend;
672		}
673	} while ((mm = mm->m_next));
674
675	/* Send checksum */
676	if (clpoutbyte(chksum, LPMAXSPIN2, ppbus))
677		goto nend;
678
679	/* Go quiescent */
680	ppb_wdtr(ppbus, 0);
681
682	err = 0;			/* No errors */
683
684	nend:
685	if (err)  {				/* if we didn't timeout... */
686		ifp->if_oerrors++;
687		lprintf("X");
688	} else {
689		ifp->if_opackets++;
690		ifp->if_obytes += m->m_pkthdr.len;
691		if (ifp->if_bpf)
692		    lptap(ifp, m);
693	}
694
695	m_freem(m);
696
697	if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) {
698		lprintf("^");
699		lp_intr(dev);
700	}
701	(void) splx(s);
702	return 0;
703    }
704
705    if (ppb_rstr(ppbus) & LPIP_SHAKE) {
706        lprintf("&");
707        lp_intr(dev);
708    }
709
710    if (lpoutbyte(0x08, LPMAXSPIN1, ppbus))
711        goto end;
712    if (lpoutbyte(0x00, LPMAXSPIN2, ppbus))
713        goto end;
714
715    mm = m;
716    do {
717        cp = mtod(mm,u_char *);
718	len = mm->m_len;
719        while (len--)
720	    if (lpoutbyte(*cp++, LPMAXSPIN2, ppbus))
721	        goto end;
722    } while ((mm = mm->m_next));
723
724    err = 0;				/* no errors were encountered */
725
726    end:
727    --cp;
728    ppb_wdtr(ppbus, txmitl[*cp] ^ 0x17);
729
730    if (err)  {				/* if we didn't timeout... */
731	ifp->if_oerrors++;
732        lprintf("X");
733    } else {
734	ifp->if_opackets++;
735	ifp->if_obytes += m->m_pkthdr.len;
736	if (ifp->if_bpf)
737	    lptap(ifp, m);
738    }
739
740    m_freem(m);
741
742    if (ppb_rstr(ppbus) & LPIP_SHAKE) {
743	lprintf("^");
744	lp_intr(dev);
745    }
746
747    (void) splx(s);
748    return 0;
749}
750
751static device_method_t lp_methods[] = {
752  	/* device interface */
753	DEVMETHOD(device_identify,	lp_identify),
754	DEVMETHOD(device_probe,		lp_probe),
755	DEVMETHOD(device_attach,	lp_attach),
756
757	{ 0, 0 }
758};
759
760static driver_t lp_driver = {
761  "plip",
762  lp_methods,
763  sizeof(struct lp_data),
764};
765
766DRIVER_MODULE(plip, ppbus, lp_driver, lp_devclass, 0, 0);
767