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NetBSD/sys/arch/i386/isa/if_el.c

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/*
* Copyright (c) 1994, Matthew E. Kimmel. Permission is hereby granted
* to use, copy, modify and distribute this software provided that both
* the copyright notice and this permission notice appear in all copies
* of the software, derivative works or modified versions, and any
* portions thereof.
*/
/*
* 3COM Etherlink 3C501 device driver
*
* $Id: if_el.c,v 1.13 1994/05/13 06:13:48 mycroft Exp $
*/
/*
* Bugs/possible improvements:
* - Does not currently support DMA
* - Does not currently support multicasts
*/
#include "bpfilter.h"
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <sys/device.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/if_ether.h>
#endif
#ifdef NS
#include <netns/ns.h>
#include <netns/ns_if.h>
#endif
#if NBPFILTER > 0
#include <net/bpf.h>
#include <net/bpfdesc.h>
#endif
#include <machine/cpu.h>
#include <machine/pio.h>
#include <i386/isa/isavar.h>
#include <i386/isa/icu.h>
#include <i386/isa/if_elreg.h>
#define ETHER_MIN_LEN 64
#define ETHER_MAX_LEN 1518
#define ETHER_ADDR_LEN 6
/* for debugging convenience */
#ifdef EL_DEBUG
#define dprintf(x) printf x
#else
#define dprintf(x)
#endif
/*
* per-line info and status
*/
struct el_softc {
struct device sc_dev;
struct intrhand sc_ih;
struct arpcom sc_arpcom; /* ethernet common */
u_short sc_iobase; /* base I/O addr */
char sc_pktbuf[EL_BUFSIZ]; /* frame buffer */
};
/*
* prototypes
*/
int elintr __P((struct el_softc *));
static int el_init __P((struct el_softc *));
static int el_ioctl __P((struct ifnet *, int, caddr_t));
static int el_start __P((struct ifnet *));
static int el_watchdog __P((int));
static void el_reset __P((struct el_softc *));
static void el_stop __P((struct el_softc *));
static int el_xmit __P((struct el_softc *, int));
static inline void elread __P((struct el_softc *, caddr_t, int));
static struct mbuf *elget __P((caddr_t, int, struct ifnet *));
static inline void el_hardreset __P((struct el_softc *));
int elprobe();
void elattach();
/* isa_driver structure for autoconf */
struct cfdriver elcd = {
NULL, "el", elprobe, elattach, DV_IFNET, sizeof(struct el_softc)
};
/*
* Probe routine.
*
* See if the card is there and at the right place.
* (XXX - cgd -- needs help)
*/
int
elprobe(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct el_softc *sc = (void *)self;
struct isa_attach_args *ia = aux;
u_short iobase = ia->ia_iobase;
u_char station_addr[ETHER_ADDR_LEN];
int i;
/* First check the base. */
if (iobase < 0x280 || iobase > 0x3f0)
return 0;
/* Grab some info for our structure. */
sc->sc_iobase = iobase;
/*
* Now attempt to grab the station address from the PROM and see if it
* contains the 3com vendor code.
*/
dprintf(("Probing 3c501 at 0x%x...\n", iobase));
/* Reset the board. */
dprintf(("Resetting board...\n"));
outb(iobase+EL_AC, EL_AC_RESET);
delay(5);
outb(iobase+EL_AC, 0);
/* Now read the address. */
dprintf(("Reading station address...\n"));
for (i = 0; i < ETHER_ADDR_LEN; i++) {
outb(iobase+EL_GPBL, i);
station_addr[i] = inb(iobase+EL_EAW);
}
dprintf(("Address is %s\n", ether_sprintf(station_addr)));
/*
* If the vendor code is ok, return a 1. We'll assume that whoever
* configured this system is right about the IRQ.
*/
if (station_addr[0] != 0x02 || station_addr[1] != 0x60 ||
station_addr[2] != 0x8c) {
dprintf(("Bad vendor code.\n"));
return 0;
}
dprintf(("Vendor code ok.\n"));
/* Copy the station address into the arpcom structure. */
bcopy(station_addr, sc->sc_arpcom.ac_enaddr, ETHER_ADDR_LEN);
ia->ia_iosize = 4; /* XXX */
ia->ia_msize = 0;
return 1;
}
/*
* Attach the interface to the kernel data structures. By the time this is
* called, we know that the card exists at the given I/O address. We still
* assume that the IRQ given is correct.
*/
void
elattach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct el_softc *sc = (void *)self;
struct isa_attach_args *ia = aux;
struct ifnet *ifp = &sc->sc_arpcom.ac_if;
dprintf(("Attaching %s...\n", sc->sc_dev.dv_xname));
/* Stop the board. */
el_stop(sc);
/* Initialize ifnet structure. */
ifp->if_unit = sc->sc_dev.dv_unit;
ifp->if_name = elcd.cd_name;
ifp->if_output = ether_output;
ifp->if_start = el_start;
ifp->if_ioctl = el_ioctl;
ifp->if_watchdog = el_watchdog;
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS;
/* Now we can attach the interface. */
dprintf(("Attaching interface...\n"));
if_attach(ifp);
ether_ifattach(ifp);
/* Print out some information for the user. */
printf("%s: address %s\n", sc->sc_dev.dv_xname,
ether_sprintf(sc->sc_arpcom.ac_enaddr));
/* Finally, attach to bpf filter if it is present. */
#if NBPFILTER > 0
dprintf(("Attaching to BPF...\n"));
bpfattach(&ifp->if_bpf, ifp, DLT_EN10MB, sizeof(struct ether_header));
#endif
sc->sc_ih.ih_fun = elintr;
sc->sc_ih.ih_arg = sc;
sc->sc_ih.ih_level = IPL_NET;
intr_establish(ia->ia_irq, &sc->sc_ih);
dprintf(("elattach() finished.\n"));
}
/*
* Reset interface.
*/
static void
el_reset(sc)
struct el_softc *sc;
{
int s;
dprintf(("elreset()\n"));
s = splimp();
el_stop(sc);
el_init(sc);
splx(s);
}
/*
* Stop interface.
*/
static void
el_stop(sc)
struct el_softc *sc;
{
outb(sc->sc_iobase+EL_AC, 0);
}
/*
* Do a hardware reset of the board, and upload the ethernet address again in
* case the board forgets.
*/
static inline void
el_hardreset(sc)
struct el_softc *sc;
{
u_short iobase = sc->sc_iobase;
int i;
outb(iobase+EL_AC, EL_AC_RESET);
delay(5);
outb(iobase+EL_AC, 0);
for (i = 0; i < ETHER_ADDR_LEN; i++)
outb(iobase+i, sc->sc_arpcom.ac_enaddr[i]);
}
/*
* Initialize interface.
*/
static int
el_init(sc)
struct el_softc *sc;
{
struct ifnet *ifp = &sc->sc_arpcom.ac_if;
u_short iobase = sc->sc_iobase;
int s;
/* If address not known, do nothing. */
if (ifp->if_addrlist == 0)
return;
s = splimp();
/* First, reset the board. */
el_hardreset(sc);
/* Configure rx. */
dprintf(("Configuring rx...\n"));
if (ifp->if_flags & IFF_PROMISC)
outb(iobase+EL_RXC, EL_RXC_AGF | EL_RXC_DSHORT | EL_RXC_DDRIB | EL_RXC_DOFLOW | EL_RXC_PROMISC);
else
outb(iobase+EL_RXC, EL_RXC_AGF | EL_RXC_DSHORT | EL_RXC_DDRIB | EL_RXC_DOFLOW | EL_RXC_ABROAD);
outb(iobase+EL_RBC, 0);
/* Configure TX. */
dprintf(("Configuring tx...\n"));
outb(iobase+EL_TXC, 0);
/* Start reception. */
dprintf(("Starting reception...\n"));
outb(iobase+EL_AC, EL_AC_IRQE | EL_AC_RX);
/* Set flags appropriately. */
ifp->if_flags |= IFF_RUNNING;
ifp->if_flags &= ~IFF_OACTIVE;
/* And start output. */
el_start(ifp);
splx(s);
}
/*
* Start output on interface. Get datagrams from the queue and output them,
* giving the receiver a chance between datagrams. Call only from splimp or
* interrupt level!
*/
static int
el_start(ifp)
struct ifnet *ifp;
{
struct el_softc *sc = elcd.cd_devs[ifp->if_unit];
u_short iobase = sc->sc_iobase;
struct mbuf *m, *m0;
int s, i, len, retries, done;
dprintf(("el_start()...\n"));
s = splimp();
/* Don't do anything if output is active. */
if (sc->sc_arpcom.ac_if.if_flags & IFF_OACTIVE)
return;
sc->sc_arpcom.ac_if.if_flags |= IFF_OACTIVE;
/*
* The main loop. They warned me against endless loops, but would I
* listen? NOOO....
*/
for (;;) {
/* Dequeue the next datagram. */
IF_DEQUEUE(&sc->sc_arpcom.ac_if.if_snd, m0);
/* If there's nothing to send, return. */
if (!m0) {
sc->sc_arpcom.ac_if.if_flags &= ~IFF_OACTIVE;
splx(s);
return;
}
/* Disable the receiver. */
outb(iobase+EL_AC, EL_AC_HOST);
outb(iobase+EL_RBC, 0);
/* Copy the datagram to the buffer. */
len = 0;
for (m = m0; m; m = m->m_next) {
if (m->m_len == 0)
continue;
bcopy(mtod(m, caddr_t), sc->sc_pktbuf + len, m->m_len);
len += m->m_len;
}
m_freem(m0);
len = max(len, ETHER_MIN_LEN);
/* Give the packet to the bpf, if any. */
#if NBPFILTER > 0
if (sc->sc_arpcom.ac_if.if_bpf)
bpf_tap(sc->sc_arpcom.ac_if.if_bpf, sc->sc_pktbuf, len);
#endif
/* Transfer datagram to board. */
dprintf(("el: xfr pkt length=%d...\n", len));
i = EL_BUFSIZ - len;
outb(iobase+EL_GPBL, i);
outb(iobase+EL_GPBH, i >> 8);
outsb(iobase+EL_BUF, sc->sc_pktbuf, len);
/* Now transmit the datagram. */
retries = 0;
done = 0;
while (!done) {
if (el_xmit(sc, len)) {
/* Something went wrong. */
done = -1;
break;
}
/* Check out status. */
i = inb(iobase+EL_TXS);
dprintf(("tx status=0x%x\n", i));
if ((i & EL_TXS_READY) == 0) {
dprintf(("el: err txs=%x\n", i));
sc->sc_arpcom.ac_if.if_oerrors++;
if (i & (EL_TXS_COLL | EL_TXS_COLL16)) {
if ((i & EL_TXC_DCOLL16) == 0 &&
retries < 15) {
retries++;
outb(iobase+EL_AC, EL_AC_HOST);
}
} else
done = 1;
} else {
sc->sc_arpcom.ac_if.if_opackets++;
done = 1;
}
}
if (done == -1)
/* Packet not transmitted. */
continue;
/*
* Now give the card a chance to receive.
* Gotta love 3c501s...
*/
(void)inb(iobase+EL_AS);
outb(iobase+EL_AC, EL_AC_IRQE | EL_AC_RX);
splx(s);
/* Interrupt here. */
s = splimp();
}
}
/*
* This function actually attempts to transmit a datagram downloaded to the
* board. Call at splimp or interrupt, after downloading data! Returns 0 on
* success, non-0 on failure.
*/
static int
el_xmit(sc, len)
struct el_softc *sc;
int len;
{
u_short iobase = sc->sc_iobase;
int gpl;
int i;
gpl = EL_BUFSIZ - len;
dprintf(("el: xmit..."));
outb(iobase+EL_GPBL, gpl);
outb(iobase+EL_GPBH, gpl >> 8);
outb(iobase+EL_AC, EL_AC_TXFRX);
i = 20000;
while ((inb(iobase+EL_AS) & EL_AS_TXBUSY) && (i > 0))
i--;
if (i == 0) {
dprintf(("tx not ready\n"));
sc->sc_arpcom.ac_if.if_oerrors++;
return -1;
}
dprintf(("%d cycles.\n", 20000 - i));
return 0;
}
/*
* Controller interrupt.
*/
int
elintr(sc)
register struct el_softc *sc;
{
u_short iobase = sc->sc_iobase;
int stat, rxstat, len, done;
dprintf(("elintr: "));
/* Check board status. */
stat = inb(iobase+EL_AS);
if (stat & EL_AS_RXBUSY) {
(void)inb(iobase+EL_RXC);
outb(iobase+EL_AC, EL_AC_IRQE | EL_AC_RX);
return 0;
}
done = 0;
while (!done) {
rxstat = inb(iobase+EL_RXS);
if (rxstat & EL_RXS_STALE) {
(void)inb(iobase+EL_RXC);
outb(iobase+EL_AC, EL_AC_IRQE | EL_AC_RX);
return 1;
}
/* If there's an overflow, reinit the board. */
if ((rxstat & EL_RXS_NOFLOW) == 0) {
dprintf(("overflow.\n"));
el_hardreset(sc);
/* Put board back into receive mode. */
if (sc->sc_arpcom.ac_if.if_flags & IFF_PROMISC)
outb(iobase+EL_RXC, EL_RXC_AGF | EL_RXC_DSHORT | EL_RXC_DDRIB | EL_RXC_DOFLOW | EL_RXC_PROMISC);
else
outb(iobase+EL_RXC, EL_RXC_AGF | EL_RXC_DSHORT | EL_RXC_DDRIB | EL_RXC_DOFLOW | EL_RXC_ABROAD);
(void)inb(iobase+EL_AS);
outb(iobase+EL_RBC, 0);
(void)inb(iobase+EL_RXC);
outb(iobase+EL_AC, EL_AC_IRQE | EL_AC_RX);
return 1;
}
/* Incoming packet. */
len = inb(iobase+EL_RBL);
len |= inb(iobase+EL_RBH) << 8;
dprintf(("receive len=%d rxstat=%x ", len, rxstat));
outb(iobase+EL_AC, EL_AC_HOST);
/*
* If packet too short or too long, restore rx mode and return.
*/
if (len <= sizeof(struct ether_header) ||
len > ETHER_MAX_LEN) {
if (sc->sc_arpcom.ac_if.if_flags & IFF_PROMISC)
outb(iobase+EL_RXC, EL_RXC_AGF | EL_RXC_DSHORT | EL_RXC_DDRIB | EL_RXC_DOFLOW | EL_RXC_PROMISC);
else
outb(iobase+EL_RXC, EL_RXC_AGF | EL_RXC_DSHORT | EL_RXC_DDRIB | EL_RXC_DOFLOW | EL_RXC_ABROAD);
(void)inb(iobase+EL_AS);
outb(iobase+EL_RBC, 0);
(void)inb(iobase+EL_RXC);
outb(iobase+EL_AC, EL_AC_IRQE | EL_AC_RX);
return 1;
}
sc->sc_arpcom.ac_if.if_ipackets++;
/* Copy the data into our buffer. */
outb(iobase+EL_GPBL, 0);
outb(iobase+EL_GPBH, 0);
insb(iobase+EL_BUF, sc->sc_pktbuf, len);
outb(iobase+EL_RBC, 0);
outb(iobase+EL_AC, EL_AC_RX);
dprintf(("%s-->", ether_sprintf(sc->sc_pktbuf+6)));
dprintf(("%s\n", ether_sprintf(sc->sc_pktbuf)));
/* Pass data up to upper levels. */
elread(sc, (caddr_t)sc->sc_pktbuf, len);
/* Is there another packet? */
stat = inb(iobase+EL_AS);
/* If so, do it all again (i.e. don't set done to 1). */
if ((stat & EL_AS_RXBUSY) == 0)
dprintf(("<rescan> "));
else
done = 1;
}
(void)inb(iobase+EL_RXC);
outb(iobase+EL_AC, EL_AC_IRQE | EL_AC_RX);
return 1;
}
/*
* Pass a packet up to the higher levels.
*/
static inline void
elread(sc, buf, len)
struct el_softc *sc;
caddr_t buf;
int len;
{
register struct ether_header *eh;
struct mbuf *m;
eh = (struct ether_header *)buf;
len -= sizeof(struct ether_header);
if (len <= 0)
return;
/* Pull packet off interface. */
m = elget(buf, len, &sc->sc_arpcom.ac_if);
if (m == 0)
return;
#if NBPFILTER > 0
/*
* Check if there's a BPF listener on this interface.
* If so, hand off the raw packet to bpf.
*/
if (sc->sc_arpcom.ac_if.if_bpf) {
bpf_mtap(sc->sc_arpcom.ac_if.if_bpf, m);
/*
* Note that the interface cannot be in promiscuous mode if
* there are no BPF listeners. And if we are in promiscuous
* mode, we have to check if this packet is really ours.
*/
if ((sc->sc_arpcom.ac_if.if_flags & IFF_PROMISC) &&
(eh->ether_dhost[0] & 1) == 0 && /* !mcast and !bcast */
bcmp(eh->ether_dhost, sc->sc_arpcom.ac_enaddr,
sizeof(eh->ether_dhost)) != 0) {
m_freem(m);
return;
}
}
#endif
ether_input(&sc->sc_arpcom.ac_if, eh, m);
}
/*
* Pull read data off a interface. Len is length of data, with local net
* header stripped. We copy the data into mbufs. When full cluster sized
* units are present we copy into clusters.
*/
struct mbuf *
elget(buf, totlen, ifp)
caddr_t buf;
int totlen;
struct ifnet *ifp;
{
struct mbuf *top, **mp, *m, *p;
int len;
register caddr_t cp = buf;
char *epkt;
buf += sizeof(struct ether_header);
cp = buf;
epkt = cp + totlen;
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == 0)
return 0;
m->m_pkthdr.rcvif = ifp;
m->m_pkthdr.len = totlen;
m->m_len = MHLEN;
top = 0;
mp = &top;
while (totlen > 0) {
if (top) {
MGET(m, M_DONTWAIT, MT_DATA);
if (m == 0) {
m_freem(top);
return 0;
}
m->m_len = MLEN;
}
len = min(totlen, epkt - cp);
if (len >= MINCLSIZE) {
MCLGET(m, M_DONTWAIT);
if (m->m_flags & M_EXT)
m->m_len = len = min(len, MCLBYTES);
else
len = m->m_len;
} else {
/*
* Place initial small packet/header at end of mbuf.
*/
if (len < m->m_len) {
if (top == 0 && len + max_linkhdr <= m->m_len)
m->m_data += max_linkhdr;
m->m_len = len;
} else
len = m->m_len;
}
bcopy(cp, mtod(m, caddr_t), (unsigned)len);
cp += len;
*mp = m;
mp = &m->m_next;
totlen -= len;
if (cp == epkt)
cp = buf;
}
return top;
}
/*
* Process an ioctl request. This code needs some work - it looks pretty ugly.
*/
static int
el_ioctl(ifp, cmd, data)
register struct ifnet *ifp;
int cmd;
caddr_t data;
{
struct el_softc *sc = elcd.cd_devs[ifp->if_unit];
struct ifaddr *ifa = (struct ifaddr *)data;
struct ifreq *ifr = (struct ifreq *)data;
int s, error = 0;
s = splimp();
switch (cmd) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
switch (ifa->ifa_addr->sa_family) {
#ifdef INET
case AF_INET:
el_init(sc); /* before arpwhohas */
/*
* See if another station has *our* IP address.
* i.e.: There is an address conflict! If a
* conflict exists, a message is sent to the
* console.
*/
sc->sc_arpcom.ac_ipaddr = IA_SIN(ifa)->sin_addr;
arpwhohas(&sc->sc_arpcom, &IA_SIN(ifa)->sin_addr);
break;
#endif
#ifdef NS
/*
* XXX - This code is probably wrong.
*/
case AF_NS:
{
register struct ns_addr *ina = &IA_SNS(ifa)->sns_addr;
if (ns_nullhost(*ina))
ina->x_host =
*(union ns_host *)(sc->sc_arpcom.ac_enaddr);
else {
/*
*
*/
bcopy((caddr_t)ina->x_host.c_host,
(caddr_t)sc->sc_arpcom.ac_enaddr,
sizeof(sc->sc_arpcom.ac_enaddr));
}
/* Set new address. */
el_init(sc);
break;
}
#endif
default:
el_init(sc);
break;
}
break;
case SIOCSIFFLAGS:
if ((ifp->if_flags & IFF_UP) == 0 &&
(ifp->if_flags & IFF_RUNNING) != 0) {
/*
* If interface is marked down and it is running, then
* stop it.
*/
el_stop(sc);
ifp->if_flags &= ~IFF_RUNNING;
} else if ((ifp->if_flags & IFF_UP) != 0 &&
(ifp->if_flags & IFF_RUNNING) == 0) {
/*
* If interface is marked up and it is stopped, then
* start it.
*/
el_init(sc);
} else {
/*
* Some other important flag might have changed, so
* reset.
*/
el_reset(sc);
}
default:
error = EINVAL;
}
(void) splx(s);
return error;
}
/*
* Device timeout routine.
*/
static int
el_watchdog(unit)
int unit;
{
struct el_softc *sc = elcd.cd_devs[unit];
log(LOG_ERR, "%s: device timeout\n", sc->sc_dev.dv_xname);
sc->sc_arpcom.ac_if.if_oerrors++;
el_reset(sc);
}
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