2 * Copyright (c) 1997 Poul-Henning Kamp
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
26 * From Id: lpt.c,v 1.55.2.1 1996/11/12 09:08:38 phk Exp
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.
35 * This driver sends two bytes (0x08, 0x00) in front of each packet,
36 * to allow us to distinguish another format later.
38 * Now added an Linux/Crynwr compatibility mode which is enabled using
39 * IF_LINK0 - Tim Wilkinson.
42 * Make HDLC/PPP mode, use IF_LLC1 to enable.
44 * Connect the two computers using a Laplink parallel cable to use this
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 |
58 * +----------------------------------------+
59 * |DATA3 5 10 Strobe 0/0x08 |
61 * +----------------------------------------+
62 * |DATA4 6 11 Data 0/0x10 |
63 * |BUSY 11 6 1/~0x80 |
64 * +----------------------------------------+
65 * |GND 18-25 18-25 GND - |
66 * +----------------------------------------+
68 * Expect transfer-rates up to 75 kbyte/sec.
70 * If GCC could correctly grok
71 * register int port asm("edx")
72 * the code would be cleaner
74 * Poul-Henning Kamp <phk@freebsd.org>
78 * Update for ppbus, PLIP support only - Nicolas Souchu
81 #include <sys/param.h>
82 #include <sys/systm.h>
84 #include <sys/socket.h>
85 #include <sys/sockio.h>
86 #include <sys/kernel.h>
87 #include <sys/malloc.h>
90 #include <net/if_types.h>
91 #include <net/netisr.h>
93 #include <netinet/in.h>
94 #include <netinet/in_var.h>
98 #include <dev/ppbus/ppbconf.h>
100 #include "opt_plip.h"
102 #ifndef LPMTU /* MTU for the lp# interfaces */
106 #ifndef LPMAXSPIN1 /* DELAY factor for the lp# interfaces */
107 #define LPMAXSPIN1 8000 /* Spinning for remote intr to happen */
110 #ifndef LPMAXSPIN2 /* DELAY factor for the lp# interfaces */
111 #define LPMAXSPIN2 500 /* Spinning for remote handshake to happen */
114 #ifndef LPMAXERRS /* Max errors before !RUNNING */
115 #define LPMAXERRS 100
118 #define CLPIPHDRLEN 14 /* We send dummy ethernet addresses (two) + packet type in front of packet */
119 #define CLPIP_SHAKE 0x80 /* This bit toggles between nibble reception */
120 #define MLPIPHDRLEN CLPIPHDRLEN
122 #define LPIPHDRLEN 2 /* We send 0x08, 0x00 in front of packet */
123 #define LPIP_SHAKE 0x40 /* This bit toggles between nibble reception */
124 #if !defined(MLPIPHDRLEN) || LPIPHDRLEN > MLPIPHDRLEN
125 #define MLPIPHDRLEN LPIPHDRLEN
128 #define LPIPTBLSIZE 256 /* Size of octet translation table */
130 #define lprintf if (lptflag) printf
133 static int volatile lptflag = 1;
135 static int volatile lptflag = 0;
139 unsigned short lp_unit;
141 struct ppb_device lp_dev;
149 #define MAXPLIP 8 /* XXX not much better! */
150 static struct lpt_softc *lpdata[MAXPLIP];
153 /* Tables for the lp# interface */
154 static u_char *txmith;
155 #define txmitl (txmith+(1*LPIPTBLSIZE))
156 #define trecvh (txmith+(2*LPIPTBLSIZE))
157 #define trecvl (txmith+(3*LPIPTBLSIZE))
159 static u_char *ctxmith;
160 #define ctxmitl (ctxmith+(1*LPIPTBLSIZE))
161 #define ctrecvh (ctxmith+(2*LPIPTBLSIZE))
162 #define ctrecvl (ctxmith+(3*LPIPTBLSIZE))
164 /* Functions for the lp# interface */
165 static struct ppb_device *lpprobe(struct ppb_data *);
166 static int lpattach(struct ppb_device *);
168 static int lpinittables(void);
169 static int lpioctl(struct ifnet *, u_long, caddr_t);
170 static int lpoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
172 static void lpintr(int);
175 * Make ourselves visible as a ppbus driver
178 static struct ppb_driver lpdriver = {
179 lpprobe, lpattach, "lp"
181 DATA_SET(ppbdriver_set, lpdriver);
187 static struct ppb_device *
188 lpprobe(struct ppb_data *ppb)
190 struct lpt_softc *lp;
192 /* if we haven't interrupts, the probe fails */
193 if (!ppb->ppb_link->id_irq) {
194 printf("plip: not an interrupt driven port, failed.\n");
198 lp = (struct lpt_softc *) malloc(sizeof(struct lpt_softc),
201 printf("lp: cannot malloc!\n");
204 bzero(lp, sizeof(struct lpt_softc));
209 * lp dependent initialisation.
214 printf("plip: irq %d\n", ppb->ppb_link->id_irq);
217 * ppbus dependent initialisation.
219 lp->lp_dev.id_unit = lp->lp_unit;
220 lp->lp_dev.name = lpdriver.name;
221 lp->lp_dev.ppb = ppb;
222 lp->lp_dev.intr = lpintr;
224 /* Ok, go to next device on next probe */
227 return (&lp->lp_dev);
231 lpattach (struct ppb_device *dev)
233 int unit = dev->id_unit;
234 struct lpt_softc *sc = lpdata[unit];
235 struct ifnet *ifp = &sc->sc_if;
240 printf("plip%d: <PLIP network interface> on ppbus %d\n",
241 dev->id_unit, dev->ppb->ppb_link->adapter_unit);
247 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST;
248 ifp->if_ioctl = lpioctl;
249 ifp->if_output = lpoutput;
250 ifp->if_type = IFT_PARA;
253 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
256 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
261 * Build the translation tables for the LPIP (BSD unix) protocol.
262 * We don't want to calculate these nasties in our tight loop, so we
263 * precalculate them when we initialize.
271 txmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT);
277 ctxmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT);
282 for (i=0; i < LPIPTBLSIZE; i++) {
283 ctxmith[i] = (i & 0xF0) >> 4;
284 ctxmitl[i] = 0x10 | (i & 0x0F);
285 ctrecvh[i] = (i & 0x78) << 1;
286 ctrecvl[i] = (i & 0x78) >> 3;
289 for (i=0; i < LPIPTBLSIZE; i++) {
290 txmith[i] = ((i & 0x80) >> 3) | ((i & 0x70) >> 4) | 0x08;
291 txmitl[i] = ((i & 0x08) << 1) | (i & 0x07);
292 trecvh[i] = ((~i) & 0x80) | ((i & 0x38) << 1);
293 trecvl[i] = (((~i) & 0x80) >> 4) | ((i & 0x38) >> 3);
300 * Process an ioctl request.
304 lpioctl (struct ifnet *ifp, u_long cmd, caddr_t data)
306 struct lpt_softc *sc = lpdata[ifp->if_unit];
307 struct ifaddr *ifa = (struct ifaddr *)data;
308 struct ifreq *ifr = (struct ifreq *)data;
317 if (ifa->ifa_addr->sa_family != AF_INET)
320 ifp->if_flags |= IFF_UP;
323 if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) {
325 ppb_wctr(&sc->lp_dev, 0x00);
326 ifp->if_flags &= ~IFF_RUNNING;
328 /* IFF_UP is not set, try to release the bus anyway */
329 ppb_release_bus(&sc->lp_dev);
332 if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) {
335 * Should the request be interruptible?
337 if ((error = ppb_request_bus(&sc->lp_dev, PPB_WAIT|PPB_INTR)))
340 /* Now IFF_UP means that we own the bus */
342 ppb_set_mode(&sc->lp_dev, PPB_COMPATIBLE);
344 if (lpinittables()) {
345 ppb_release_bus(&sc->lp_dev);
349 sc->sc_ifbuf = malloc(sc->sc_if.if_mtu + MLPIPHDRLEN,
352 ppb_release_bus(&sc->lp_dev);
356 ppb_wctr(&sc->lp_dev, IRQENABLE);
357 ifp->if_flags |= IFF_RUNNING;
363 sc->sc_ifbuf = malloc(ifr->ifr_mtu+MLPIPHDRLEN, M_DEVBUF, M_NOWAIT);
370 sc->sc_if.if_mtu = ifr->ifr_mtu;
374 ifr->ifr_mtu = sc->sc_if.if_mtu;
380 return EAFNOSUPPORT; /* XXX */
382 switch (ifr->ifr_addr.sa_family) {
394 * No ifmedia support at this stage; maybe use it
395 * in future for eg. protocol selection.
400 lprintf("LP:ioctl(0x%lx)\n", cmd);
407 clpoutbyte (u_char byte, int spin, struct ppb_device *dev)
409 ppb_wdtr(dev, ctxmitl[byte]);
410 while (ppb_rstr(dev) & CLPIP_SHAKE)
414 ppb_wdtr(dev, ctxmith[byte]);
415 while (!(ppb_rstr(dev) & CLPIP_SHAKE))
423 clpinbyte (int spin, struct ppb_device *dev)
427 while((ppb_rstr(dev) & CLPIP_SHAKE))
434 while(!(ppb_rstr(dev) & CLPIP_SHAKE))
441 return (ctrecvl[cl] | ctrecvh[c]);
445 lptap(struct ifnet *ifp, struct mbuf *m)
448 * Send a packet through bpf. We need to prepend the address family
449 * as a four byte field. Cons up a dummy header to pacify bpf. This
450 * is safe because bpf will only read from the mbuf (i.e., it won't
451 * try to free it or keep a pointer to it).
453 u_int32_t af = AF_INET;
457 m0.m_len = sizeof(u_int32_t);
458 m0.m_data = (char *)⁡
465 struct lpt_softc *sc = lpdata[unit];
473 if (sc->sc_if.if_flags & IFF_LINK0) {
475 /* Ack. the request */
476 ppb_wdtr(&sc->lp_dev, 0x01);
478 /* Get the packet length */
479 j = clpinbyte(LPMAXSPIN2, &sc->lp_dev);
483 j = clpinbyte(LPMAXSPIN2, &sc->lp_dev);
486 len = len + (j << 8);
487 if (len > sc->sc_if.if_mtu + MLPIPHDRLEN)
493 j = clpinbyte(LPMAXSPIN2, &sc->lp_dev);
499 /* Get and ignore checksum */
500 j = clpinbyte(LPMAXSPIN2, &sc->lp_dev);
505 len = bp - sc->sc_ifbuf;
506 if (len <= CLPIPHDRLEN)
511 if (IF_QFULL(&ipintrq)) {
517 sc->sc_if.if_ipackets++;
518 sc->sc_if.if_ibytes += len;
519 top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, &sc->sc_if, 0);
521 if (sc->sc_if.if_bpf)
522 lptap(&sc->sc_if, top);
523 IF_ENQUEUE(&ipintrq, top);
524 schednetisr(NETISR_IP);
528 while ((ppb_rstr(&sc->lp_dev) & LPIP_SHAKE)) {
529 len = sc->sc_if.if_mtu + LPIPHDRLEN;
533 cl = ppb_rstr(&sc->lp_dev);
534 ppb_wdtr(&sc->lp_dev, 8);
537 while((ppb_rstr(&sc->lp_dev) & LPIP_SHAKE))
540 c = ppb_rstr(&sc->lp_dev);
541 ppb_wdtr(&sc->lp_dev, 0);
543 *bp++= trecvh[cl] | trecvl[c];
546 while (!((cl=ppb_rstr(&sc->lp_dev)) & LPIP_SHAKE)) {
548 (((cl = ppb_rstr(&sc->lp_dev)) ^ 0xb8) & 0xf8) ==
556 len = bp - sc->sc_ifbuf;
557 if (len <= LPIPHDRLEN)
562 if (IF_QFULL(&ipintrq)) {
568 sc->sc_if.if_ipackets++;
569 sc->sc_if.if_ibytes += len;
570 top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, &sc->sc_if, 0);
572 if (sc->sc_if.if_bpf)
573 lptap(&sc->sc_if, top);
574 IF_ENQUEUE(&ipintrq, top);
575 schednetisr(NETISR_IP);
581 ppb_wdtr(&sc->lp_dev, 0);
583 sc->sc_if.if_ierrors++;
587 * We are not able to send receive anything for now,
588 * so stop wasting our time
590 if (sc->sc_iferrs > LPMAXERRS) {
591 printf("lp%d: Too many errors, Going off-line.\n", unit);
592 ppb_wctr(&sc->lp_dev, 0x00);
593 sc->sc_if.if_flags &= ~IFF_RUNNING;
603 lpoutbyte (u_char byte, int spin, struct ppb_device *dev)
605 ppb_wdtr(dev, txmith[byte]);
606 while (!(ppb_rstr(dev) & LPIP_SHAKE))
609 ppb_wdtr(dev, txmitl[byte]);
610 while (ppb_rstr(dev) & LPIP_SHAKE)
617 lpoutput (struct ifnet *ifp, struct mbuf *m,
618 struct sockaddr *dst, struct rtentry *rt)
620 struct lpt_softc *sc = lpdata[ifp->if_unit];
628 /* We need a sensible value if we abort */
630 ifp->if_flags |= IFF_RUNNING;
632 err = 1; /* assume we're aborting because of an error */
636 /* Suspend (on laptops) or receive-errors might have taken us offline */
637 ppb_wctr(&sc->lp_dev, IRQENABLE);
639 if (ifp->if_flags & IFF_LINK0) {
641 if (!(ppb_rstr(&sc->lp_dev) & CLPIP_SHAKE)) {
643 lpintr(ifp->if_unit);
646 /* Alert other end to pending packet */
648 ppb_wdtr(&sc->lp_dev, 0x08);
649 while ((ppb_rstr(&sc->lp_dev) & 0x08) == 0)
654 /* Calculate length of packet, then send that */
656 count += 14; /* Ethernet header len */
659 for (mm = m; mm; mm = mm->m_next) {
662 if (clpoutbyte(count & 0xFF, LPMAXSPIN1, &sc->lp_dev))
664 if (clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, &sc->lp_dev))
667 /* Send dummy ethernet header */
668 for (i = 0; i < 12; i++) {
669 if (clpoutbyte(i, LPMAXSPIN1, &sc->lp_dev))
674 if (clpoutbyte(0x08, LPMAXSPIN1, &sc->lp_dev))
676 if (clpoutbyte(0x00, LPMAXSPIN1, &sc->lp_dev))
678 chksum += 0x08 + 0x00; /* Add into checksum */
682 cp = mtod(mm, u_char *);
686 if (clpoutbyte(*cp++, LPMAXSPIN2, &sc->lp_dev))
689 } while ((mm = mm->m_next));
692 if (clpoutbyte(chksum, LPMAXSPIN2, &sc->lp_dev))
696 ppb_wdtr(&sc->lp_dev, 0);
698 err = 0; /* No errors */
701 if (err) { /* if we didn't timeout... */
706 ifp->if_obytes += m->m_pkthdr.len;
713 if (!(ppb_rstr(&sc->lp_dev) & CLPIP_SHAKE)) {
715 lpintr(ifp->if_unit);
721 if (ppb_rstr(&sc->lp_dev) & LPIP_SHAKE) {
723 lpintr(ifp->if_unit);
726 if (lpoutbyte(0x08, LPMAXSPIN1, &sc->lp_dev))
728 if (lpoutbyte(0x00, LPMAXSPIN2, &sc->lp_dev))
733 cp = mtod(mm,u_char *);
736 if (lpoutbyte(*cp++, LPMAXSPIN2, &sc->lp_dev))
738 } while ((mm = mm->m_next));
740 err = 0; /* no errors were encountered */
744 ppb_wdtr(&sc->lp_dev, txmitl[*cp] ^ 0x17);
746 if (err) { /* if we didn't timeout... */
751 ifp->if_obytes += m->m_pkthdr.len;
758 if (ppb_rstr(&sc->lp_dev) & LPIP_SHAKE) {
760 lpintr(ifp->if_unit);