if_plip.c revision 184130 
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 184130 2008-10-21 18:30:10Z jhb $");
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_ifp;
150	device_t	sc_dev;
151	u_char		*sc_ifbuf;
152	int		sc_iferrs;
153
154	struct resource *res_irq;
155};
156
157/* Tables for the lp# interface */
158static u_char *txmith;
159#define txmitl (txmith+(1*LPIPTBLSIZE))
160#define trecvh (txmith+(2*LPIPTBLSIZE))
161#define trecvl (txmith+(3*LPIPTBLSIZE))
162
163static 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 */
169static int lpinittables(void);
170static int lpioctl(struct ifnet *, u_long, caddr_t);
171static int lpoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
172	struct rtentry *);
173static void lp_intr(void *);
174
175#define DEVTOSOFTC(dev) \
176	((struct lp_data *)device_get_softc(dev))
177
178static devclass_t lp_devclass;
179
180static void
181lp_identify(driver_t *driver, device_t parent)
182{
183	device_t dev;
184
185	dev = device_find_child(parent, "plip", -1);
186	if (!dev)
187		BUS_ADD_CHILD(parent, 0, "plip", -1);
188}
189/*
190 * lpprobe()
191 */
192static int
193lp_probe(device_t dev)
194{
195
196	device_set_desc(dev, "PLIP network interface");
197
198	return (0);
199}
200
201static int
202lp_attach (device_t dev)
203{
204	struct lp_data *lp = DEVTOSOFTC(dev);
205	struct ifnet *ifp;
206	int rid = 0;
207
208	lp->sc_dev = dev;
209
210	/*
211	 * Reserve the interrupt resource.  If we don't have one, the
212	 * attach fails.
213	 */
214	lp->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
215	    RF_SHAREABLE);
216	if (lp->res_irq == 0) {
217		device_printf(dev, "cannot reserve interrupt, failed.\n");
218		return (ENXIO);
219	}
220
221	ifp = lp->sc_ifp = if_alloc(IFT_PARA);
222	if (ifp == NULL) {
223		return (ENOSPC);
224	}
225
226	ifp->if_softc = lp;
227	if_initname(ifp, device_get_name(dev), device_get_unit(dev));
228	ifp->if_mtu = LPMTU;
229	ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST |
230	    IFF_NEEDSGIANT;
231	ifp->if_ioctl = lpioctl;
232	ifp->if_output = lpoutput;
233	ifp->if_hdrlen = 0;
234	ifp->if_addrlen = 0;
235	ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
236	if_attach(ifp);
237
238	bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
239
240	return (0);
241}
242/*
243 * Build the translation tables for the LPIP (BSD unix) protocol.
244 * We don't want to calculate these nasties in our tight loop, so we
245 * precalculate them when we initialize.
246 */
247static int
248lpinittables (void)
249{
250    int i;
251
252    if (!txmith)
253	txmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT);
254
255    if (!txmith)
256	return 1;
257
258    if (!ctxmith)
259	ctxmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT);
260
261    if (!ctxmith)
262	return 1;
263
264    for (i=0; i < LPIPTBLSIZE; i++) {
265	ctxmith[i] = (i & 0xF0) >> 4;
266	ctxmitl[i] = 0x10 | (i & 0x0F);
267	ctrecvh[i] = (i & 0x78) << 1;
268	ctrecvl[i] = (i & 0x78) >> 3;
269    }
270
271    for (i=0; i < LPIPTBLSIZE; i++) {
272	txmith[i] = ((i & 0x80) >> 3) | ((i & 0x70) >> 4) | 0x08;
273	txmitl[i] = ((i & 0x08) << 1) | (i & 0x07);
274	trecvh[i] = ((~i) & 0x80) | ((i & 0x38) << 1);
275	trecvl[i] = (((~i) & 0x80) >> 4) | ((i & 0x38) >> 3);
276    }
277
278    return 0;
279}
280
281/*
282 * Process an ioctl request.
283 */
284
285static int
286lpioctl (struct ifnet *ifp, u_long cmd, caddr_t data)
287{
288    struct lp_data *sc = ifp->if_softc;
289    device_t dev = sc->sc_dev;
290    device_t ppbus = device_get_parent(dev);
291    struct ifaddr *ifa = (struct ifaddr *)data;
292    struct ifreq *ifr = (struct ifreq *)data;
293    u_char *ptr;
294    void *ih;
295    int error;
296
297    switch (cmd) {
298
299    case SIOCSIFDSTADDR:
300    case SIOCAIFADDR:
301    case SIOCSIFADDR:
302	if (ifa->ifa_addr->sa_family != AF_INET)
303	    return EAFNOSUPPORT;
304
305	ifp->if_flags |= IFF_UP;
306	/* FALLTHROUGH */
307    case SIOCSIFFLAGS:
308	if ((!(ifp->if_flags & IFF_UP)) &&
309	  (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
310
311	    ppb_wctr(ppbus, 0x00);
312	    ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
313
314	    /* IFF_UP is not set, try to release the bus anyway */
315	    ppb_release_bus(ppbus, dev);
316	    break;
317	}
318	if (((ifp->if_flags & IFF_UP)) &&
319	  (!(ifp->if_drv_flags & IFF_DRV_RUNNING))) {
320
321	    /* XXX
322	     * Should the request be interruptible?
323	     */
324	    if ((error = ppb_request_bus(ppbus, dev, PPB_WAIT|PPB_INTR)))
325		return (error);
326
327	    /* Now IFF_UP means that we own the bus */
328
329	    ppb_set_mode(ppbus, PPB_COMPATIBLE);
330
331	    if (lpinittables()) {
332		ppb_release_bus(ppbus, dev);
333		return ENOBUFS;
334	    }
335
336	    sc->sc_ifbuf = malloc(sc->sc_ifp->if_mtu + MLPIPHDRLEN,
337				  M_DEVBUF, M_WAITOK);
338	    if (!sc->sc_ifbuf) {
339		ppb_release_bus(ppbus, dev);
340		return ENOBUFS;
341	    }
342
343	    /* attach our interrupt handler, later detached when the bus is released */
344	    if ((error = bus_setup_intr(dev, sc->res_irq,
345					INTR_TYPE_NET, NULL, lp_intr, dev, &ih))) {
346		ppb_release_bus(ppbus, dev);
347		return (error);
348	    }
349
350	    ppb_wctr(ppbus, IRQENABLE);
351	    ifp->if_drv_flags |= IFF_DRV_RUNNING;
352	}
353	break;
354
355    case SIOCSIFMTU:
356	ptr = sc->sc_ifbuf;
357	sc->sc_ifbuf = malloc(ifr->ifr_mtu+MLPIPHDRLEN, M_DEVBUF, M_NOWAIT);
358	if (!sc->sc_ifbuf) {
359	    sc->sc_ifbuf = ptr;
360	    return ENOBUFS;
361	}
362	if (ptr)
363	    free(ptr,M_DEVBUF);
364	sc->sc_ifp->if_mtu = ifr->ifr_mtu;
365	break;
366
367    case SIOCGIFMTU:
368	ifr->ifr_mtu = sc->sc_ifp->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
400static __inline int
401clpoutbyte (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
416static __inline int
417clpinbyte (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
438static void
439lptap(struct ifnet *ifp, struct mbuf *m)
440{
441	u_int32_t af = AF_INET;
442	bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
443}
444
445static void
446lp_intr (void *arg)
447{
448	device_t dev = (device_t)arg;
449        device_t ppbus = device_get_parent(dev);
450	struct lp_data *sc = DEVTOSOFTC(dev);
451	int len, s, j;
452	u_char *bp;
453	u_char c, cl;
454	struct mbuf *top;
455
456	s = splhigh();
457
458	if (sc->sc_ifp->if_flags & IFF_LINK0) {
459
460	    /* Ack. the request */
461	    ppb_wdtr(ppbus, 0x01);
462
463	    /* Get the packet length */
464	    j = clpinbyte(LPMAXSPIN2, ppbus);
465	    if (j == -1)
466		goto err;
467	    len = j;
468	    j = clpinbyte(LPMAXSPIN2, ppbus);
469	    if (j == -1)
470		goto err;
471	    len = len + (j << 8);
472	    if (len > sc->sc_ifp->if_mtu + MLPIPHDRLEN)
473		goto err;
474
475	    bp  = sc->sc_ifbuf;
476
477	    while (len--) {
478	        j = clpinbyte(LPMAXSPIN2, ppbus);
479	        if (j == -1) {
480		    goto err;
481	        }
482	        *bp++ = j;
483	    }
484	    /* Get and ignore checksum */
485	    j = clpinbyte(LPMAXSPIN2, ppbus);
486	    if (j == -1) {
487	        goto err;
488	    }
489
490	    len = bp - sc->sc_ifbuf;
491	    if (len <= CLPIPHDRLEN)
492	        goto err;
493
494	    sc->sc_iferrs = 0;
495
496	    len -= CLPIPHDRLEN;
497	    sc->sc_ifp->if_ipackets++;
498	    sc->sc_ifp->if_ibytes += len;
499	    top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, sc->sc_ifp, 0);
500	    if (top) {
501		if (bpf_peers_present(sc->sc_ifp->if_bpf))
502		    lptap(sc->sc_ifp, top);
503		netisr_queue(NETISR_IP, top);	/* mbuf is free'd on failure. */
504	    }
505	    goto done;
506	}
507	while ((ppb_rstr(ppbus) & LPIP_SHAKE)) {
508	    len = sc->sc_ifp->if_mtu + LPIPHDRLEN;
509	    bp  = sc->sc_ifbuf;
510	    while (len--) {
511
512		cl = ppb_rstr(ppbus);
513		ppb_wdtr(ppbus, 8);
514
515		j = LPMAXSPIN2;
516		while((ppb_rstr(ppbus) & LPIP_SHAKE))
517		    if(!--j) goto err;
518
519		c = ppb_rstr(ppbus);
520		ppb_wdtr(ppbus, 0);
521
522		*bp++= trecvh[cl] | trecvl[c];
523
524		j = LPMAXSPIN2;
525		while (!((cl=ppb_rstr(ppbus)) & LPIP_SHAKE)) {
526		    if (cl != c &&
527			(((cl = ppb_rstr(ppbus)) ^ 0xb8) & 0xf8) ==
528			  (c & 0xf8))
529			goto end;
530		    if (!--j) goto err;
531		}
532	    }
533
534	end:
535	    len = bp - sc->sc_ifbuf;
536	    if (len <= LPIPHDRLEN)
537		goto err;
538
539	    sc->sc_iferrs = 0;
540
541	    len -= LPIPHDRLEN;
542	    sc->sc_ifp->if_ipackets++;
543	    sc->sc_ifp->if_ibytes += len;
544	    top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, sc->sc_ifp, 0);
545	    if (top) {
546		if (bpf_peers_present(sc->sc_ifp->if_bpf))
547		    lptap(sc->sc_ifp, top);
548		netisr_queue(NETISR_IP, top);	/* mbuf is free'd on failure. */
549	    }
550	}
551	goto done;
552
553    err:
554	ppb_wdtr(ppbus, 0);
555	lprintf("R");
556	sc->sc_ifp->if_ierrors++;
557	sc->sc_iferrs++;
558
559	/*
560	 * We are not able to send receive anything for now,
561	 * so stop wasting our time
562	 */
563	if (sc->sc_iferrs > LPMAXERRS) {
564	    if_printf(sc->sc_ifp, "Too many errors, Going off-line.\n");
565	    ppb_wctr(ppbus, 0x00);
566	    sc->sc_ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
567	    sc->sc_iferrs=0;
568	}
569
570    done:
571	splx(s);
572	return;
573}
574
575static __inline int
576lpoutbyte (u_char byte, int spin, device_t ppbus)
577{
578    ppb_wdtr(ppbus, txmith[byte]);
579    while (!(ppb_rstr(ppbus) & LPIP_SHAKE))
580	if (--spin == 0)
581		return 1;
582    ppb_wdtr(ppbus, txmitl[byte]);
583    while (ppb_rstr(ppbus) & LPIP_SHAKE)
584	if (--spin == 0)
585		return 1;
586    return 0;
587}
588
589static int
590lpoutput (struct ifnet *ifp, struct mbuf *m,
591	  struct sockaddr *dst, struct rtentry *rt)
592{
593    struct lp_data *sc = ifp->if_softc;
594    device_t dev = sc->sc_dev;
595    device_t ppbus = device_get_parent(dev);
596    int s, err;
597    struct mbuf *mm;
598    u_char *cp = "\0\0";
599    u_char chksum = 0;
600    int count = 0;
601    int i, len, spin;
602
603    /* We need a sensible value if we abort */
604    cp++;
605    ifp->if_drv_flags |= IFF_DRV_RUNNING;
606
607    err = 1;			/* assume we're aborting because of an error */
608
609    s = splhigh();
610
611    /* Suspend (on laptops) or receive-errors might have taken us offline */
612    ppb_wctr(ppbus, IRQENABLE);
613
614    if (ifp->if_flags & IFF_LINK0) {
615
616	if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) {
617	    lprintf("&");
618	    lp_intr(dev);
619	}
620
621	/* Alert other end to pending packet */
622	spin = LPMAXSPIN1;
623	ppb_wdtr(ppbus, 0x08);
624	while ((ppb_rstr(ppbus) & 0x08) == 0)
625		if (--spin == 0) {
626			goto nend;
627		}
628
629	/* Calculate length of packet, then send that */
630
631	count += 14;		/* Ethernet header len */
632
633	mm = m;
634	for (mm = m; mm; mm = mm->m_next) {
635		count += mm->m_len;
636	}
637	if (clpoutbyte(count & 0xFF, LPMAXSPIN1, ppbus))
638		goto nend;
639	if (clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, ppbus))
640		goto nend;
641
642	/* Send dummy ethernet header */
643	for (i = 0; i < 12; i++) {
644		if (clpoutbyte(i, LPMAXSPIN1, ppbus))
645			goto nend;
646		chksum += i;
647	}
648
649	if (clpoutbyte(0x08, LPMAXSPIN1, ppbus))
650		goto nend;
651	if (clpoutbyte(0x00, LPMAXSPIN1, ppbus))
652		goto nend;
653	chksum += 0x08 + 0x00;		/* Add into checksum */
654
655	mm = m;
656	do {
657		cp = mtod(mm, u_char *);
658		len = mm->m_len;
659		while (len--) {
660			chksum += *cp;
661			if (clpoutbyte(*cp++, LPMAXSPIN2, ppbus))
662				goto nend;
663		}
664	} while ((mm = mm->m_next));
665
666	/* Send checksum */
667	if (clpoutbyte(chksum, LPMAXSPIN2, ppbus))
668		goto nend;
669
670	/* Go quiescent */
671	ppb_wdtr(ppbus, 0);
672
673	err = 0;			/* No errors */
674
675	nend:
676	if (err)  {				/* if we didn't timeout... */
677		ifp->if_oerrors++;
678		lprintf("X");
679	} else {
680		ifp->if_opackets++;
681		ifp->if_obytes += m->m_pkthdr.len;
682		if (bpf_peers_present(ifp->if_bpf))
683		    lptap(ifp, m);
684	}
685
686	m_freem(m);
687
688	if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) {
689		lprintf("^");
690		lp_intr(dev);
691	}
692	(void) splx(s);
693	return 0;
694    }
695
696    if (ppb_rstr(ppbus) & LPIP_SHAKE) {
697        lprintf("&");
698        lp_intr(dev);
699    }
700
701    if (lpoutbyte(0x08, LPMAXSPIN1, ppbus))
702        goto end;
703    if (lpoutbyte(0x00, LPMAXSPIN2, ppbus))
704        goto end;
705
706    mm = m;
707    do {
708        cp = mtod(mm,u_char *);
709	len = mm->m_len;
710        while (len--)
711	    if (lpoutbyte(*cp++, LPMAXSPIN2, ppbus))
712	        goto end;
713    } while ((mm = mm->m_next));
714
715    err = 0;				/* no errors were encountered */
716
717    end:
718    --cp;
719    ppb_wdtr(ppbus, txmitl[*cp] ^ 0x17);
720
721    if (err)  {				/* if we didn't timeout... */
722	ifp->if_oerrors++;
723        lprintf("X");
724    } else {
725	ifp->if_opackets++;
726	ifp->if_obytes += m->m_pkthdr.len;
727	if (bpf_peers_present(ifp->if_bpf))
728	    lptap(ifp, m);
729    }
730
731    m_freem(m);
732
733    if (ppb_rstr(ppbus) & LPIP_SHAKE) {
734	lprintf("^");
735	lp_intr(dev);
736    }
737
738    (void) splx(s);
739    return 0;
740}
741
742static device_method_t lp_methods[] = {
743  	/* device interface */
744	DEVMETHOD(device_identify,	lp_identify),
745	DEVMETHOD(device_probe,		lp_probe),
746	DEVMETHOD(device_attach,	lp_attach),
747
748	{ 0, 0 }
749};
750
751static driver_t lp_driver = {
752  "plip",
753  lp_methods,
754  sizeof(struct lp_data),
755};
756
757DRIVER_MODULE(plip, ppbus, lp_driver, lp_devclass, 0, 0);
758MODULE_DEPEND(plip, ppbus, 1, 1, 1);
759