/*- * Copyright (c) 1997 Poul-Henning Kamp * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * From Id: lpt.c,v 1.55.2.1 1996/11/12 09:08:38 phk Exp * $FreeBSD$ */ /* * Parallel port TCP/IP interfaces added. I looked at the driver from * MACH but this is a complete rewrite, and btw. incompatible, and it * should perform better too. I have never run the MACH driver though. * * This driver sends two bytes (0x08, 0x00) in front of each packet, * to allow us to distinguish another format later. * * Now added a Linux/Crynwr compatibility mode which is enabled using * IF_LINK0 - Tim Wilkinson. * * TODO: * Make HDLC/PPP mode, use IF_LLC1 to enable. * * Connect the two computers using a Laplink parallel cable to use this * feature: * * +----------------------------------------+ * |A-name A-End B-End Descr. Port/Bit | * +----------------------------------------+ * |DATA0 2 15 Data 0/0x01 | * |-ERROR 15 2 1/0x08 | * +----------------------------------------+ * |DATA1 3 13 Data 0/0x02 | * |+SLCT 13 3 1/0x10 | * +----------------------------------------+ * |DATA2 4 12 Data 0/0x04 | * |+PE 12 4 1/0x20 | * +----------------------------------------+ * |DATA3 5 10 Strobe 0/0x08 | * |-ACK 10 5 1/0x40 | * +----------------------------------------+ * |DATA4 6 11 Data 0/0x10 | * |BUSY 11 6 1/~0x80 | * +----------------------------------------+ * |GND 18-25 18-25 GND - | * +----------------------------------------+ * * Expect transfer-rates up to 75 kbyte/sec. * * If GCC could correctly grok * register int port asm("edx") * the code would be cleaner * * Poul-Henning Kamp */ /* * Update for ppbus, PLIP support only - Nicolas Souchu */ #include "opt_plip.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ppbus_if.h" #include #ifndef LPMTU /* MTU for the lp# interfaces */ #define LPMTU 1500 #endif #ifndef LPMAXSPIN1 /* DELAY factor for the lp# interfaces */ #define LPMAXSPIN1 8000 /* Spinning for remote intr to happen */ #endif #ifndef LPMAXSPIN2 /* DELAY factor for the lp# interfaces */ #define LPMAXSPIN2 500 /* Spinning for remote handshake to happen */ #endif #ifndef LPMAXERRS /* Max errors before !RUNNING */ #define LPMAXERRS 100 #endif #define CLPIPHDRLEN 14 /* We send dummy ethernet addresses (two) + packet type in front of packet */ #define CLPIP_SHAKE 0x80 /* This bit toggles between nibble reception */ #define MLPIPHDRLEN CLPIPHDRLEN #define LPIPHDRLEN 2 /* We send 0x08, 0x00 in front of packet */ #define LPIP_SHAKE 0x40 /* This bit toggles between nibble reception */ #if !defined(MLPIPHDRLEN) || LPIPHDRLEN > MLPIPHDRLEN #define MLPIPHDRLEN LPIPHDRLEN #endif #define LPIPTBLSIZE 256 /* Size of octet translation table */ #define lprintf if (lptflag) printf #ifdef PLIP_DEBUG static int volatile lptflag = 1; #else static int volatile lptflag = 0; #endif struct lp_data { unsigned short lp_unit; struct ifnet sc_if; u_char *sc_ifbuf; int sc_iferrs; struct resource *res_irq; }; /* Tables for the lp# interface */ static u_char *txmith; #define txmitl (txmith+(1*LPIPTBLSIZE)) #define trecvh (txmith+(2*LPIPTBLSIZE)) #define trecvl (txmith+(3*LPIPTBLSIZE)) static u_char *ctxmith; #define ctxmitl (ctxmith+(1*LPIPTBLSIZE)) #define ctrecvh (ctxmith+(2*LPIPTBLSIZE)) #define ctrecvl (ctxmith+(3*LPIPTBLSIZE)) /* Functions for the lp# interface */ static int lpinittables(void); static int lpioctl(struct ifnet *, u_long, caddr_t); static int lpoutput(struct ifnet *, struct mbuf *, struct sockaddr *, struct rtentry *); static void lp_intr(void *); #define DEVTOSOFTC(dev) \ ((struct lp_data *)device_get_softc(dev)) #define UNITOSOFTC(unit) \ ((struct lp_data *)devclass_get_softc(lp_devclass, (unit))) #define UNITODEVICE(unit) \ (devclass_get_device(lp_devclass, (unit))) static devclass_t lp_devclass; static void lp_identify(driver_t *driver, device_t parent) { BUS_ADD_CHILD(parent, 0, "plip", -1); } /* * lpprobe() */ static int lp_probe(device_t dev) { device_t ppbus = device_get_parent(dev); struct lp_data *lp; int zero = 0; uintptr_t irq; lp = DEVTOSOFTC(dev); bzero(lp, sizeof(struct lp_data)); /* retrieve the ppbus irq */ BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); /* if we haven't interrupts, the probe fails */ if (irq == -1) { device_printf(dev, "not an interrupt driven port, failed.\n"); return (ENXIO); } /* reserve the interrupt resource, expecting irq is available to continue */ lp->res_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &zero, irq, irq, 1, RF_SHAREABLE); if (lp->res_irq == 0) { device_printf(dev, "cannot reserve interrupt, failed.\n"); return (ENXIO); } /* * lp dependent initialisation. */ lp->lp_unit = device_get_unit(dev); device_set_desc(dev, "PLIP network interface"); return (0); } static int lp_attach (device_t dev) { struct lp_data *lp = DEVTOSOFTC(dev); struct ifnet *ifp = &lp->sc_if; ifp->if_softc = lp; ifp->if_name = "lp"; ifp->if_unit = device_get_unit(dev); ifp->if_mtu = LPMTU; ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST; ifp->if_ioctl = lpioctl; ifp->if_output = lpoutput; ifp->if_type = IFT_PARA; ifp->if_hdrlen = 0; ifp->if_addrlen = 0; ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; if_attach(ifp); bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); return (0); } /* * Build the translation tables for the LPIP (BSD unix) protocol. * We don't want to calculate these nasties in our tight loop, so we * precalculate them when we initialize. */ static int lpinittables (void) { int i; if (!txmith) txmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT); if (!txmith) return 1; if (!ctxmith) ctxmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT); if (!ctxmith) return 1; for (i=0; i < LPIPTBLSIZE; i++) { ctxmith[i] = (i & 0xF0) >> 4; ctxmitl[i] = 0x10 | (i & 0x0F); ctrecvh[i] = (i & 0x78) << 1; ctrecvl[i] = (i & 0x78) >> 3; } for (i=0; i < LPIPTBLSIZE; i++) { txmith[i] = ((i & 0x80) >> 3) | ((i & 0x70) >> 4) | 0x08; txmitl[i] = ((i & 0x08) << 1) | (i & 0x07); trecvh[i] = ((~i) & 0x80) | ((i & 0x38) << 1); trecvl[i] = (((~i) & 0x80) >> 4) | ((i & 0x38) >> 3); } return 0; } /* * Process an ioctl request. */ static int lpioctl (struct ifnet *ifp, u_long cmd, caddr_t data) { device_t dev = UNITODEVICE(ifp->if_unit); device_t ppbus = device_get_parent(dev); struct lp_data *sc = DEVTOSOFTC(dev); struct ifaddr *ifa = (struct ifaddr *)data; struct ifreq *ifr = (struct ifreq *)data; u_char *ptr; void *ih; int error; switch (cmd) { case SIOCSIFDSTADDR: case SIOCAIFADDR: case SIOCSIFADDR: if (ifa->ifa_addr->sa_family != AF_INET) return EAFNOSUPPORT; ifp->if_flags |= IFF_UP; /* FALLTHROUGH */ case SIOCSIFFLAGS: if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) { ppb_wctr(ppbus, 0x00); ifp->if_flags &= ~IFF_RUNNING; /* IFF_UP is not set, try to release the bus anyway */ ppb_release_bus(ppbus, dev); break; } if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) { /* XXX * Should the request be interruptible? */ if ((error = ppb_request_bus(ppbus, dev, PPB_WAIT|PPB_INTR))) return (error); /* Now IFF_UP means that we own the bus */ ppb_set_mode(ppbus, PPB_COMPATIBLE); if (lpinittables()) { ppb_release_bus(ppbus, dev); return ENOBUFS; } sc->sc_ifbuf = malloc(sc->sc_if.if_mtu + MLPIPHDRLEN, M_DEVBUF, M_WAITOK); if (!sc->sc_ifbuf) { ppb_release_bus(ppbus, dev); return ENOBUFS; } /* attach our interrupt handler, later detached when the bus is released */ if ((error = BUS_SETUP_INTR(ppbus, dev, sc->res_irq, INTR_TYPE_NET, lp_intr, dev, &ih))) { ppb_release_bus(ppbus, dev); return (error); } ppb_wctr(ppbus, IRQENABLE); ifp->if_flags |= IFF_RUNNING; } break; case SIOCSIFMTU: ptr = sc->sc_ifbuf; sc->sc_ifbuf = malloc(ifr->ifr_mtu+MLPIPHDRLEN, M_DEVBUF, M_NOWAIT); if (!sc->sc_ifbuf) { sc->sc_ifbuf = ptr; return ENOBUFS; } if (ptr) free(ptr,M_DEVBUF); sc->sc_if.if_mtu = ifr->ifr_mtu; break; case SIOCGIFMTU: ifr->ifr_mtu = sc->sc_if.if_mtu; break; case SIOCADDMULTI: case SIOCDELMULTI: if (ifr == 0) { return EAFNOSUPPORT; /* XXX */ } switch (ifr->ifr_addr.sa_family) { case AF_INET: break; default: return EAFNOSUPPORT; } break; case SIOCGIFMEDIA: /* * No ifmedia support at this stage; maybe use it * in future for eg. protocol selection. */ return EINVAL; default: lprintf("LP:ioctl(0x%lx)\n", cmd); return EINVAL; } return 0; } static __inline int clpoutbyte (u_char byte, int spin, device_t ppbus) { ppb_wdtr(ppbus, ctxmitl[byte]); while (ppb_rstr(ppbus) & CLPIP_SHAKE) if (--spin == 0) { return 1; } ppb_wdtr(ppbus, ctxmith[byte]); while (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) if (--spin == 0) { return 1; } return 0; } static __inline int clpinbyte (int spin, device_t ppbus) { u_char c, cl; while((ppb_rstr(ppbus) & CLPIP_SHAKE)) if(!--spin) { return -1; } cl = ppb_rstr(ppbus); ppb_wdtr(ppbus, 0x10); while(!(ppb_rstr(ppbus) & CLPIP_SHAKE)) if(!--spin) { return -1; } c = ppb_rstr(ppbus); ppb_wdtr(ppbus, 0x00); return (ctrecvl[cl] | ctrecvh[c]); } static void lptap(struct ifnet *ifp, struct mbuf *m) { /* * Send a packet through bpf. We need to prepend the address family * as a four byte field. Cons up a dummy header to pacify bpf. This * is safe because bpf will only read from the mbuf (i.e., it won't * try to free it or keep a pointer to it). */ u_int32_t af = AF_INET; struct mbuf m0; m0.m_next = m; m0.m_len = sizeof(u_int32_t); m0.m_data = (char *)⁡ BPF_MTAP(ifp, &m0); } static void lp_intr (void *arg) { device_t dev = (device_t)arg; device_t ppbus = device_get_parent(dev); struct lp_data *sc = DEVTOSOFTC(dev); int len, s, j; u_char *bp; u_char c, cl; struct mbuf *top; s = splhigh(); if (sc->sc_if.if_flags & IFF_LINK0) { /* Ack. the request */ ppb_wdtr(ppbus, 0x01); /* Get the packet length */ j = clpinbyte(LPMAXSPIN2, ppbus); if (j == -1) goto err; len = j; j = clpinbyte(LPMAXSPIN2, ppbus); if (j == -1) goto err; len = len + (j << 8); if (len > sc->sc_if.if_mtu + MLPIPHDRLEN) goto err; bp = sc->sc_ifbuf; while (len--) { j = clpinbyte(LPMAXSPIN2, ppbus); if (j == -1) { goto err; } *bp++ = j; } /* Get and ignore checksum */ j = clpinbyte(LPMAXSPIN2, ppbus); if (j == -1) { goto err; } len = bp - sc->sc_ifbuf; if (len <= CLPIPHDRLEN) goto err; sc->sc_iferrs = 0; len -= CLPIPHDRLEN; sc->sc_if.if_ipackets++; sc->sc_if.if_ibytes += len; top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, &sc->sc_if, 0); if (top) { if (sc->sc_if.if_bpf) lptap(&sc->sc_if, top); netisr_queue(NETISR_IP, top); } goto done; } while ((ppb_rstr(ppbus) & LPIP_SHAKE)) { len = sc->sc_if.if_mtu + LPIPHDRLEN; bp = sc->sc_ifbuf; while (len--) { cl = ppb_rstr(ppbus); ppb_wdtr(ppbus, 8); j = LPMAXSPIN2; while((ppb_rstr(ppbus) & LPIP_SHAKE)) if(!--j) goto err; c = ppb_rstr(ppbus); ppb_wdtr(ppbus, 0); *bp++= trecvh[cl] | trecvl[c]; j = LPMAXSPIN2; while (!((cl=ppb_rstr(ppbus)) & LPIP_SHAKE)) { if (cl != c && (((cl = ppb_rstr(ppbus)) ^ 0xb8) & 0xf8) == (c & 0xf8)) goto end; if (!--j) goto err; } } end: len = bp - sc->sc_ifbuf; if (len <= LPIPHDRLEN) goto err; sc->sc_iferrs = 0; len -= LPIPHDRLEN; sc->sc_if.if_ipackets++; sc->sc_if.if_ibytes += len; top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, &sc->sc_if, 0); if (top) { if (sc->sc_if.if_bpf) lptap(&sc->sc_if, top); netisr_queue(NETISR_IP, top); } } goto done; err: ppb_wdtr(ppbus, 0); lprintf("R"); sc->sc_if.if_ierrors++; sc->sc_iferrs++; /* * We are not able to send receive anything for now, * so stop wasting our time */ if (sc->sc_iferrs > LPMAXERRS) { printf("lp%d: Too many errors, Going off-line.\n", device_get_unit(dev)); ppb_wctr(ppbus, 0x00); sc->sc_if.if_flags &= ~IFF_RUNNING; sc->sc_iferrs=0; } done: splx(s); return; } static __inline int lpoutbyte (u_char byte, int spin, device_t ppbus) { ppb_wdtr(ppbus, txmith[byte]); while (!(ppb_rstr(ppbus) & LPIP_SHAKE)) if (--spin == 0) return 1; ppb_wdtr(ppbus, txmitl[byte]); while (ppb_rstr(ppbus) & LPIP_SHAKE) if (--spin == 0) return 1; return 0; } static int lpoutput (struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, struct rtentry *rt) { device_t dev = UNITODEVICE(ifp->if_unit); device_t ppbus = device_get_parent(dev); int s, err; struct mbuf *mm; u_char *cp = "\0\0"; u_char chksum = 0; int count = 0; int i, len, spin; /* We need a sensible value if we abort */ cp++; ifp->if_flags |= IFF_RUNNING; err = 1; /* assume we're aborting because of an error */ s = splhigh(); /* Suspend (on laptops) or receive-errors might have taken us offline */ ppb_wctr(ppbus, IRQENABLE); if (ifp->if_flags & IFF_LINK0) { if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) { lprintf("&"); lp_intr(dev); } /* Alert other end to pending packet */ spin = LPMAXSPIN1; ppb_wdtr(ppbus, 0x08); while ((ppb_rstr(ppbus) & 0x08) == 0) if (--spin == 0) { goto nend; } /* Calculate length of packet, then send that */ count += 14; /* Ethernet header len */ mm = m; for (mm = m; mm; mm = mm->m_next) { count += mm->m_len; } if (clpoutbyte(count & 0xFF, LPMAXSPIN1, ppbus)) goto nend; if (clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, ppbus)) goto nend; /* Send dummy ethernet header */ for (i = 0; i < 12; i++) { if (clpoutbyte(i, LPMAXSPIN1, ppbus)) goto nend; chksum += i; } if (clpoutbyte(0x08, LPMAXSPIN1, ppbus)) goto nend; if (clpoutbyte(0x00, LPMAXSPIN1, ppbus)) goto nend; chksum += 0x08 + 0x00; /* Add into checksum */ mm = m; do { cp = mtod(mm, u_char *); len = mm->m_len; while (len--) { chksum += *cp; if (clpoutbyte(*cp++, LPMAXSPIN2, ppbus)) goto nend; } } while ((mm = mm->m_next)); /* Send checksum */ if (clpoutbyte(chksum, LPMAXSPIN2, ppbus)) goto nend; /* Go quiescent */ ppb_wdtr(ppbus, 0); err = 0; /* No errors */ nend: if (err) { /* if we didn't timeout... */ ifp->if_oerrors++; lprintf("X"); } else { ifp->if_opackets++; ifp->if_obytes += m->m_pkthdr.len; if (ifp->if_bpf) lptap(ifp, m); } m_freem(m); if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) { lprintf("^"); lp_intr(dev); } (void) splx(s); return 0; } if (ppb_rstr(ppbus) & LPIP_SHAKE) { lprintf("&"); lp_intr(dev); } if (lpoutbyte(0x08, LPMAXSPIN1, ppbus)) goto end; if (lpoutbyte(0x00, LPMAXSPIN2, ppbus)) goto end; mm = m; do { cp = mtod(mm,u_char *); len = mm->m_len; while (len--) if (lpoutbyte(*cp++, LPMAXSPIN2, ppbus)) goto end; } while ((mm = mm->m_next)); err = 0; /* no errors were encountered */ end: --cp; ppb_wdtr(ppbus, txmitl[*cp] ^ 0x17); if (err) { /* if we didn't timeout... */ ifp->if_oerrors++; lprintf("X"); } else { ifp->if_opackets++; ifp->if_obytes += m->m_pkthdr.len; if (ifp->if_bpf) lptap(ifp, m); } m_freem(m); if (ppb_rstr(ppbus) & LPIP_SHAKE) { lprintf("^"); lp_intr(dev); } (void) splx(s); return 0; } static device_method_t lp_methods[] = { /* device interface */ DEVMETHOD(device_identify, lp_identify), DEVMETHOD(device_probe, lp_probe), DEVMETHOD(device_attach, lp_attach), { 0, 0 } }; static driver_t lp_driver = { "plip", lp_methods, sizeof(struct lp_data), }; DRIVER_MODULE(plip, ppbus, lp_driver, lp_devclass, 0, 0);