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freebsd-nq/sys/dev/ppbus/if_plip.c
David E. O'Brien aad970f1fe Use __FBSDID(). 
Also some minor style cleanups.
2003-08-24 17:55:58 +00:00

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/*-
* 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
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* 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 <phk@freebsd.org>
*/
/*
* Update for ppbus, PLIP support only - Nicolas Souchu
*/
#include "opt_plip.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <net/bpf.h>
#include <dev/ppbus/ppbconf.h>
#include "ppbus_if.h"
#include <dev/ppbus/ppbio.h>
#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 *)&af;
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);
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