if_plip.c revision 147256 
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 147256 2005-06-10 16:49:24Z brooks $");
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	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;
236
237	ifp = lp->sc_ifp = if_alloc(IFT_PARA);
238	if (ifp == NULL) {
239		return (ENOSPC);
240	}
241
242	ifp->if_softc = lp;
243	if_initname(ifp, device_get_name(dev), device_get_unit(dev));
244	ifp->if_mtu = LPMTU;
245	ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST |
246	    IFF_NEEDSGIANT;
247	ifp->if_ioctl = lpioctl;
248	ifp->if_output = lpoutput;
249	ifp->if_hdrlen = 0;
250	ifp->if_addrlen = 0;
251	ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
252	if_attach(ifp);
253
254	bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
255
256	return (0);
257}
258/*
259 * Build the translation tables for the LPIP (BSD unix) protocol.
260 * We don't want to calculate these nasties in our tight loop, so we
261 * precalculate them when we initialize.
262 */
263static int
264lpinittables (void)
265{
266    int i;
267
268    if (!txmith)
269	txmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT);
270
271    if (!txmith)
272	return 1;
273
274    if (!ctxmith)
275	ctxmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT);
276
277    if (!ctxmith)
278	return 1;
279
280    for (i=0; i < LPIPTBLSIZE; i++) {
281	ctxmith[i] = (i & 0xF0) >> 4;
282	ctxmitl[i] = 0x10 | (i & 0x0F);
283	ctrecvh[i] = (i & 0x78) << 1;
284	ctrecvl[i] = (i & 0x78) >> 3;
285    }
286
287    for (i=0; i < LPIPTBLSIZE; i++) {
288	txmith[i] = ((i & 0x80) >> 3) | ((i & 0x70) >> 4) | 0x08;
289	txmitl[i] = ((i & 0x08) << 1) | (i & 0x07);
290	trecvh[i] = ((~i) & 0x80) | ((i & 0x38) << 1);
291	trecvl[i] = (((~i) & 0x80) >> 4) | ((i & 0x38) >> 3);
292    }
293
294    return 0;
295}
296
297/*
298 * Process an ioctl request.
299 */
300
301static int
302lpioctl (struct ifnet *ifp, u_long cmd, caddr_t data)
303{
304    device_t dev = UNITODEVICE(ifp->if_dunit);
305    device_t ppbus = device_get_parent(dev);
306    struct lp_data *sc = DEVTOSOFTC(dev);
307    struct ifaddr *ifa = (struct ifaddr *)data;
308    struct ifreq *ifr = (struct ifreq *)data;
309    u_char *ptr;
310    void *ih;
311    int error;
312
313    switch (cmd) {
314
315    case SIOCSIFDSTADDR:
316    case SIOCAIFADDR:
317    case SIOCSIFADDR:
318	if (ifa->ifa_addr->sa_family != AF_INET)
319	    return EAFNOSUPPORT;
320
321	ifp->if_flags |= IFF_UP;
322	/* FALLTHROUGH */
323    case SIOCSIFFLAGS:
324	if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) {
325
326	    ppb_wctr(ppbus, 0x00);
327	    ifp->if_flags &= ~IFF_RUNNING;
328
329	    /* IFF_UP is not set, try to release the bus anyway */
330	    ppb_release_bus(ppbus, dev);
331	    break;
332	}
333	if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) {
334
335	    /* XXX
336	     * Should the request be interruptible?
337	     */
338	    if ((error = ppb_request_bus(ppbus, dev, PPB_WAIT|PPB_INTR)))
339		return (error);
340
341	    /* Now IFF_UP means that we own the bus */
342
343	    ppb_set_mode(ppbus, PPB_COMPATIBLE);
344
345	    if (lpinittables()) {
346		ppb_release_bus(ppbus, dev);
347		return ENOBUFS;
348	    }
349
350	    sc->sc_ifbuf = malloc(sc->sc_ifp->if_mtu + MLPIPHDRLEN,
351				  M_DEVBUF, M_WAITOK);
352	    if (!sc->sc_ifbuf) {
353		ppb_release_bus(ppbus, dev);
354		return ENOBUFS;
355	    }
356
357	    /* attach our interrupt handler, later detached when the bus is released */
358	    if ((error = BUS_SETUP_INTR(ppbus, dev, sc->res_irq,
359					INTR_TYPE_NET, lp_intr, dev, &ih))) {
360		ppb_release_bus(ppbus, dev);
361		return (error);
362	    }
363
364	    ppb_wctr(ppbus, IRQENABLE);
365	    ifp->if_flags |= IFF_RUNNING;
366	}
367	break;
368
369    case SIOCSIFMTU:
370	ptr = sc->sc_ifbuf;
371	sc->sc_ifbuf = malloc(ifr->ifr_mtu+MLPIPHDRLEN, M_DEVBUF, M_NOWAIT);
372	if (!sc->sc_ifbuf) {
373	    sc->sc_ifbuf = ptr;
374	    return ENOBUFS;
375	}
376	if (ptr)
377	    free(ptr,M_DEVBUF);
378	sc->sc_ifp->if_mtu = ifr->ifr_mtu;
379	break;
380
381    case SIOCGIFMTU:
382	ifr->ifr_mtu = sc->sc_ifp->if_mtu;
383	break;
384
385    case SIOCADDMULTI:
386    case SIOCDELMULTI:
387	if (ifr == 0) {
388	    return EAFNOSUPPORT;		/* XXX */
389	}
390	switch (ifr->ifr_addr.sa_family) {
391
392	case AF_INET:
393	    break;
394
395	default:
396	    return EAFNOSUPPORT;
397	}
398	break;
399
400    case SIOCGIFMEDIA:
401	/*
402	 * No ifmedia support at this stage; maybe use it
403	 * in future for eg. protocol selection.
404	 */
405	return EINVAL;
406
407    default:
408	lprintf("LP:ioctl(0x%lx)\n", cmd);
409	return EINVAL;
410    }
411    return 0;
412}
413
414static __inline int
415clpoutbyte (u_char byte, int spin, device_t ppbus)
416{
417	ppb_wdtr(ppbus, ctxmitl[byte]);
418	while (ppb_rstr(ppbus) & CLPIP_SHAKE)
419		if (--spin == 0) {
420			return 1;
421		}
422	ppb_wdtr(ppbus, ctxmith[byte]);
423	while (!(ppb_rstr(ppbus) & CLPIP_SHAKE))
424		if (--spin == 0) {
425			return 1;
426		}
427	return 0;
428}
429
430static __inline int
431clpinbyte (int spin, device_t ppbus)
432{
433	u_char c, cl;
434
435	while((ppb_rstr(ppbus) & CLPIP_SHAKE))
436	    if(!--spin) {
437		return -1;
438	    }
439	cl = ppb_rstr(ppbus);
440	ppb_wdtr(ppbus, 0x10);
441
442	while(!(ppb_rstr(ppbus) & CLPIP_SHAKE))
443	    if(!--spin) {
444		return -1;
445	    }
446	c = ppb_rstr(ppbus);
447	ppb_wdtr(ppbus, 0x00);
448
449	return (ctrecvl[cl] | ctrecvh[c]);
450}
451
452static void
453lptap(struct ifnet *ifp, struct mbuf *m)
454{
455	u_int32_t af = AF_INET;
456	BPF_MTAP2(ifp, &af, sizeof(af), m);
457}
458
459static void
460lp_intr (void *arg)
461{
462	device_t dev = (device_t)arg;
463        device_t ppbus = device_get_parent(dev);
464	struct lp_data *sc = DEVTOSOFTC(dev);
465	int len, s, j;
466	u_char *bp;
467	u_char c, cl;
468	struct mbuf *top;
469
470	s = splhigh();
471
472	if (sc->sc_ifp->if_flags & IFF_LINK0) {
473
474	    /* Ack. the request */
475	    ppb_wdtr(ppbus, 0x01);
476
477	    /* Get the packet length */
478	    j = clpinbyte(LPMAXSPIN2, ppbus);
479	    if (j == -1)
480		goto err;
481	    len = j;
482	    j = clpinbyte(LPMAXSPIN2, ppbus);
483	    if (j == -1)
484		goto err;
485	    len = len + (j << 8);
486	    if (len > sc->sc_ifp->if_mtu + MLPIPHDRLEN)
487		goto err;
488
489	    bp  = sc->sc_ifbuf;
490
491	    while (len--) {
492	        j = clpinbyte(LPMAXSPIN2, ppbus);
493	        if (j == -1) {
494		    goto err;
495	        }
496	        *bp++ = j;
497	    }
498	    /* Get and ignore checksum */
499	    j = clpinbyte(LPMAXSPIN2, ppbus);
500	    if (j == -1) {
501	        goto err;
502	    }
503
504	    len = bp - sc->sc_ifbuf;
505	    if (len <= CLPIPHDRLEN)
506	        goto err;
507
508	    sc->sc_iferrs = 0;
509
510	    len -= CLPIPHDRLEN;
511	    sc->sc_ifp->if_ipackets++;
512	    sc->sc_ifp->if_ibytes += len;
513	    top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, sc->sc_ifp, 0);
514	    if (top) {
515		if (sc->sc_ifp->if_bpf)
516		    lptap(sc->sc_ifp, top);
517		netisr_queue(NETISR_IP, top);	/* mbuf is free'd on failure. */
518	    }
519	    goto done;
520	}
521	while ((ppb_rstr(ppbus) & LPIP_SHAKE)) {
522	    len = sc->sc_ifp->if_mtu + LPIPHDRLEN;
523	    bp  = sc->sc_ifbuf;
524	    while (len--) {
525
526		cl = ppb_rstr(ppbus);
527		ppb_wdtr(ppbus, 8);
528
529		j = LPMAXSPIN2;
530		while((ppb_rstr(ppbus) & LPIP_SHAKE))
531		    if(!--j) goto err;
532
533		c = ppb_rstr(ppbus);
534		ppb_wdtr(ppbus, 0);
535
536		*bp++= trecvh[cl] | trecvl[c];
537
538		j = LPMAXSPIN2;
539		while (!((cl=ppb_rstr(ppbus)) & LPIP_SHAKE)) {
540		    if (cl != c &&
541			(((cl = ppb_rstr(ppbus)) ^ 0xb8) & 0xf8) ==
542			  (c & 0xf8))
543			goto end;
544		    if (!--j) goto err;
545		}
546	    }
547
548	end:
549	    len = bp - sc->sc_ifbuf;
550	    if (len <= LPIPHDRLEN)
551		goto err;
552
553	    sc->sc_iferrs = 0;
554
555	    len -= LPIPHDRLEN;
556	    sc->sc_ifp->if_ipackets++;
557	    sc->sc_ifp->if_ibytes += len;
558	    top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, sc->sc_ifp, 0);
559	    if (top) {
560		if (sc->sc_ifp->if_bpf)
561		    lptap(sc->sc_ifp, top);
562		netisr_queue(NETISR_IP, top);	/* mbuf is free'd on failure. */
563	    }
564	}
565	goto done;
566
567    err:
568	ppb_wdtr(ppbus, 0);
569	lprintf("R");
570	sc->sc_ifp->if_ierrors++;
571	sc->sc_iferrs++;
572
573	/*
574	 * We are not able to send receive anything for now,
575	 * so stop wasting our time
576	 */
577	if (sc->sc_iferrs > LPMAXERRS) {
578	    printf("lp%d: Too many errors, Going off-line.\n", device_get_unit(dev));
579	    ppb_wctr(ppbus, 0x00);
580	    sc->sc_ifp->if_flags &= ~IFF_RUNNING;
581	    sc->sc_iferrs=0;
582	}
583
584    done:
585	splx(s);
586	return;
587}
588
589static __inline int
590lpoutbyte (u_char byte, int spin, device_t ppbus)
591{
592    ppb_wdtr(ppbus, txmith[byte]);
593    while (!(ppb_rstr(ppbus) & LPIP_SHAKE))
594	if (--spin == 0)
595		return 1;
596    ppb_wdtr(ppbus, txmitl[byte]);
597    while (ppb_rstr(ppbus) & LPIP_SHAKE)
598	if (--spin == 0)
599		return 1;
600    return 0;
601}
602
603static int
604lpoutput (struct ifnet *ifp, struct mbuf *m,
605	  struct sockaddr *dst, struct rtentry *rt)
606{
607    device_t dev = UNITODEVICE(ifp->if_dunit);
608    device_t ppbus = device_get_parent(dev);
609    int s, err;
610    struct mbuf *mm;
611    u_char *cp = "\0\0";
612    u_char chksum = 0;
613    int count = 0;
614    int i, len, spin;
615
616    /* We need a sensible value if we abort */
617    cp++;
618    ifp->if_flags |= IFF_RUNNING;
619
620    err = 1;			/* assume we're aborting because of an error */
621
622    s = splhigh();
623
624    /* Suspend (on laptops) or receive-errors might have taken us offline */
625    ppb_wctr(ppbus, IRQENABLE);
626
627    if (ifp->if_flags & IFF_LINK0) {
628
629	if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) {
630	    lprintf("&");
631	    lp_intr(dev);
632	}
633
634	/* Alert other end to pending packet */
635	spin = LPMAXSPIN1;
636	ppb_wdtr(ppbus, 0x08);
637	while ((ppb_rstr(ppbus) & 0x08) == 0)
638		if (--spin == 0) {
639			goto nend;
640		}
641
642	/* Calculate length of packet, then send that */
643
644	count += 14;		/* Ethernet header len */
645
646	mm = m;
647	for (mm = m; mm; mm = mm->m_next) {
648		count += mm->m_len;
649	}
650	if (clpoutbyte(count & 0xFF, LPMAXSPIN1, ppbus))
651		goto nend;
652	if (clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, ppbus))
653		goto nend;
654
655	/* Send dummy ethernet header */
656	for (i = 0; i < 12; i++) {
657		if (clpoutbyte(i, LPMAXSPIN1, ppbus))
658			goto nend;
659		chksum += i;
660	}
661
662	if (clpoutbyte(0x08, LPMAXSPIN1, ppbus))
663		goto nend;
664	if (clpoutbyte(0x00, LPMAXSPIN1, ppbus))
665		goto nend;
666	chksum += 0x08 + 0x00;		/* Add into checksum */
667
668	mm = m;
669	do {
670		cp = mtod(mm, u_char *);
671		len = mm->m_len;
672		while (len--) {
673			chksum += *cp;
674			if (clpoutbyte(*cp++, LPMAXSPIN2, ppbus))
675				goto nend;
676		}
677	} while ((mm = mm->m_next));
678
679	/* Send checksum */
680	if (clpoutbyte(chksum, LPMAXSPIN2, ppbus))
681		goto nend;
682
683	/* Go quiescent */
684	ppb_wdtr(ppbus, 0);
685
686	err = 0;			/* No errors */
687
688	nend:
689	if (err)  {				/* if we didn't timeout... */
690		ifp->if_oerrors++;
691		lprintf("X");
692	} else {
693		ifp->if_opackets++;
694		ifp->if_obytes += m->m_pkthdr.len;
695		if (ifp->if_bpf)
696		    lptap(ifp, m);
697	}
698
699	m_freem(m);
700
701	if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) {
702		lprintf("^");
703		lp_intr(dev);
704	}
705	(void) splx(s);
706	return 0;
707    }
708
709    if (ppb_rstr(ppbus) & LPIP_SHAKE) {
710        lprintf("&");
711        lp_intr(dev);
712    }
713
714    if (lpoutbyte(0x08, LPMAXSPIN1, ppbus))
715        goto end;
716    if (lpoutbyte(0x00, LPMAXSPIN2, ppbus))
717        goto end;
718
719    mm = m;
720    do {
721        cp = mtod(mm,u_char *);
722	len = mm->m_len;
723        while (len--)
724	    if (lpoutbyte(*cp++, LPMAXSPIN2, ppbus))
725	        goto end;
726    } while ((mm = mm->m_next));
727
728    err = 0;				/* no errors were encountered */
729
730    end:
731    --cp;
732    ppb_wdtr(ppbus, txmitl[*cp] ^ 0x17);
733
734    if (err)  {				/* if we didn't timeout... */
735	ifp->if_oerrors++;
736        lprintf("X");
737    } else {
738	ifp->if_opackets++;
739	ifp->if_obytes += m->m_pkthdr.len;
740	if (ifp->if_bpf)
741	    lptap(ifp, m);
742    }
743
744    m_freem(m);
745
746    if (ppb_rstr(ppbus) & LPIP_SHAKE) {
747	lprintf("^");
748	lp_intr(dev);
749    }
750
751    (void) splx(s);
752    return 0;
753}
754
755static device_method_t lp_methods[] = {
756  	/* device interface */
757	DEVMETHOD(device_identify,	lp_identify),
758	DEVMETHOD(device_probe,		lp_probe),
759	DEVMETHOD(device_attach,	lp_attach),
760
761	{ 0, 0 }
762};
763
764static driver_t lp_driver = {
765  "plip",
766  lp_methods,
767  sizeof(struct lp_data),
768};
769
770DRIVER_MODULE(plip, ppbus, lp_driver, lp_devclass, 0, 0);
771