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freebsd/sys/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.
*
* Questions, comments, bug reports and fixes to kimmel@cs.umass.edu.
*
* $Id: if_el.c,v 1.9 1994/11/24 14:29:17 davidg Exp $
*/
/* Except of course for the portions of code lifted from other FreeBSD
* drivers (mainly elread, elget and el_ioctl)
*/
/* 3COM Etherlink 3C501 device driver for FreeBSD */
/* Yeah, I know these cards suck, but you can also get them for free
* really easily...
*/
/* Bugs/possible improvements:
* - Does not currently support DMA
* - Does not currently support multicasts
*/
#include "el.h"
#if NEL > 0
#include "bpfilter.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <sys/devconf.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 <i386/isa/isa.h>
#include <i386/isa/isa_device.h>
#include <i386/isa/icu.h>
#include <i386/isa/if_elreg.h>
#define ETHER_MIN_LEN 64
#define ETHER_MAX_LEN 1518
/* For debugging convenience */
#ifdef EL_DEBUG
#define dprintf(x) printf x
#else
#define dprintf(x)
#endif
/* el_softc: per line info and status */
struct el_softc {
struct arpcom arpcom; /* Ethernet common */
u_short el_base; /* Base I/O addr */
caddr_t bpf; /* BPF magic cookie */
char el_pktbuf[EL_BUFSIZ]; /* Frame buffer */
} el_softc[NEL];
/* Prototypes */
int el_attach(struct isa_device *);
void el_init(int);
void elintr(int);
int el_ioctl(struct ifnet *,int,caddr_t);
int el_probe(struct isa_device *);
void el_start(struct ifnet *);
void el_reset(int);
void el_watchdog(int);
static void el_stop(int);
static int el_xmit(struct el_softc *,int);
static inline void elread(struct el_softc *,caddr_t,int);
static struct mbuf *elget(caddr_t,int,int,struct ifnet *);
static inline void el_hardreset(int);
/* isa_driver structure for autoconf */
struct isa_driver eldriver = {
el_probe, el_attach, "el"
};
static struct kern_devconf kdc_el[NEL] = { {
0, 0, 0, /* filled in by dev_attach */
"el", 0, { MDDT_ISA, 0, "net" },
isa_generic_externalize, 0, 0, ISA_EXTERNALLEN,
&kdc_isa0, /* parent */
0, /* parentdata */
DC_BUSY, /* network interfaces are always busy */
"3Com 3C501 Ethernet adapter"
} };
static inline void
el_registerdev(struct isa_device *id)
{
if(id->id_unit)
kdc_el[id->id_unit] = kdc_el[0];
kdc_el[id->id_unit].kdc_unit = id->id_unit;
kdc_el[id->id_unit].kdc_isa = id;
dev_attach(&kdc_el[id->id_unit]);
}
/* Probe routine. See if the card is there and at the right place. */
int el_probe(struct isa_device *idev)
{
struct el_softc *sc;
u_short base; /* Just for convenience */
u_char station_addr[ETHER_ADDR_LEN];
int i;
/* Grab some info for our structure */
sc = &el_softc[idev->id_unit];
sc->el_base = idev->id_iobase;
base = sc->el_base;
/* First check the base */
if((base < 0x280) || (base > 0x3f0)) {
printf("el%d: ioaddr must be between 0x280 and 0x3f0\n",
idev->id_unit);
return(0);
}
/* 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",base));
/* Reset the board */
dprintf(("Resetting board...\n"));
outb(base+EL_AC,EL_AC_RESET);
DELAY(5);
outb(base+EL_AC,0);
dprintf(("Reading station address...\n"));
/* Now read the address */
for(i=0;i<ETHER_ADDR_LEN;i++) {
outb(base+EL_GPBL,i);
station_addr[i] = inb(base+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);
} else {
dprintf(("Vendor code ok.\n"));
/* Copy the station address into the arpcom structure */
bcopy(station_addr,sc->arpcom.ac_enaddr,ETHER_ADDR_LEN);
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.
*/
int el_attach(struct isa_device *idev)
{
struct el_softc *sc;
struct ifnet *ifp;
struct ifaddr *ifa;
struct sockaddr_dl *sdl;
u_short base;
int t;
dprintf(("Attaching el%d...\n",idev->id_unit));
/* Get things pointing to the right places. */
sc = &el_softc[idev->id_unit];
ifp = &sc->arpcom.ac_if;
base = sc->el_base;
/* Now reset the board */
dprintf(("Resetting board...\n"));
el_hardreset(idev->id_unit);
/* Initialize ifnet structure */
ifp->if_unit = idev->id_unit;
ifp->if_name = "el";
ifp->if_mtu = ETHERMTU;
ifp->if_init = el_init;
ifp->if_output = ether_output;
ifp->if_start = el_start;
ifp->if_ioctl = el_ioctl;
ifp->if_reset = el_reset;
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);
el_registerdev(idev);
/* Put the station address in the ifa address list's AF_LINK
* entry, if any.
*/
ifa = ifp->if_addrlist;
while ((ifa != NULL) && (ifa->ifa_addr != NULL) &&
(ifa->ifa_addr->sa_family != AF_LINK))
ifa = ifa->ifa_next;
if((ifa != NULL) && (ifa->ifa_addr != NULL)) {
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
sdl->sdl_type = IFT_ETHER;
sdl->sdl_alen = ETHER_ADDR_LEN;
sdl->sdl_slen = 0;
bcopy(sc->arpcom.ac_enaddr,LLADDR(sdl),ETHER_ADDR_LEN);
}
/* Print out some information for the user */
printf("el%d: 3c501 address %s\n",idev->id_unit,
ether_sprintf(sc->arpcom.ac_enaddr));
/* Finally, attach to bpf filter if it is present. */
#if NBPFILTER > 0
dprintf(("Attaching to BPF...\n"));
bpfattach(&sc->bpf,ifp,DLT_EN10MB,sizeof(struct ether_header));
#endif
dprintf(("el_attach() finished.\n"));
return(1);
}
/* This routine resets the interface. */
void el_reset(int unit)
{
int s;
dprintf(("elreset()\n"));
s = splimp();
el_stop(unit);
el_init(unit);
splx(s);
}
static void el_stop(int unit)
{
struct el_softc *sc;
sc = &el_softc[unit];
outb(sc->el_base+EL_AC,0);
}
/* Do a hardware reset of the 3c501. Do not call until after el_probe()! */
static inline void el_hardreset(int unit)
{
register struct el_softc *sc;
register int base;
register int j;
sc = &el_softc[unit];
base = sc->el_base;
/* First reset the board */
outb(base+EL_AC,EL_AC_RESET);
DELAY(5);
outb(base+EL_AC,0);
/* Then give it back its ethernet address. Thanks to the mach
* source code for this undocumented goodie...
*/
for(j=0;j<ETHER_ADDR_LEN;j++)
outb(base+j,sc->arpcom.ac_enaddr[j]);
}
/* Initialize interface. */
void el_init(int unit)
{
struct el_softc *sc;
struct ifnet *ifp;
int s;
u_short base;
/* Set up pointers */
sc = &el_softc[unit];
ifp = &sc->arpcom.ac_if;
base = sc->el_base;
/* If address not known, do nothing. */
if(ifp->if_addrlist == (struct ifaddr *)0)
return;
s = splimp();
/* First, reset the board. */
dprintf(("Resetting board...\n"));
el_hardreset(unit);
/* Configure rx */
dprintf(("Configuring rx...\n"));
if(ifp->if_flags & IFF_PROMISC)
outb(base+EL_RXC,(EL_RXC_PROMISC|EL_RXC_AGF|EL_RXC_DSHORT|EL_RXC_DDRIB|EL_RXC_DOFLOW));
else
outb(base+EL_RXC,(EL_RXC_ABROAD|EL_RXC_AGF|EL_RXC_DSHORT|EL_RXC_DDRIB|EL_RXC_DOFLOW));
outb(base+EL_RBC,0);
/* Configure TX */
dprintf(("Configuring tx...\n"));
outb(base+EL_TXC,0);
/* Start reception */
dprintf(("Starting reception...\n"));
outb(base+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!
*/
void el_start(struct ifnet *ifp)
{
struct el_softc *sc;
u_short base;
struct mbuf *m, *m0;
int s, i, len, retries, done;
/* Get things pointing in the right directions */
sc = &el_softc[ifp->if_unit];
base = sc->el_base;
dprintf(("el_start()...\n"));
s = splimp();
/* Don't do anything if output is active */
if(sc->arpcom.ac_if.if_flags & IFF_OACTIVE)
return;
sc->arpcom.ac_if.if_flags |= IFF_OACTIVE;
/* The main loop. They warned me against endless loops, but
* would I listen? NOOO....
*/
while(1) {
/* Dequeue the next datagram */
IF_DEQUEUE(&sc->arpcom.ac_if.if_snd,m0);
/* If there's nothing to send, return. */
if(m0 == NULL) {
sc->arpcom.ac_if.if_flags &= ~IFF_OACTIVE;
splx(s);
return;
}
/* Disable the receiver */
outb(base+EL_AC,EL_AC_HOST);
outb(base+EL_RBC,0);
/* Copy the datagram to the buffer. */
len = 0;
for(m = m0; m != NULL; m = m->m_next) {
if(m->m_len == 0)
continue;
bcopy(mtod(m,caddr_t),sc->el_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->bpf)
bpf_tap(sc->bpf,sc->el_pktbuf,len);
#endif
/* Transfer datagram to board */
dprintf(("el: xfr pkt length=%d...\n",len));
i = EL_BUFSIZ - len;
outb(base+EL_GPBL,(i & 0xff));
outb(base+EL_GPBH,((i>>8)&0xff));
outsb(base+EL_BUF,sc->el_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(base+EL_TXS);
dprintf(("tx status=0x%x\n",i));
if(!(i & EL_TXS_READY)) {
dprintf(("el: err txs=%x\n",i));
sc->arpcom.ac_if.if_oerrors++;
if(i & (EL_TXS_COLL|EL_TXS_COLL16)) {
if((!(i & EL_TXC_DCOLL16)) && retries < 15) {
retries++;
outb(base+EL_AC,EL_AC_HOST);
}
}
else
done = 1;
}
else {
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(base+EL_AS);
outb(base+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(struct el_softc *sc,int len)
{
int gpl;
int i;
gpl = EL_BUFSIZ - len;
dprintf(("el: xmit..."));
outb((sc->el_base)+EL_GPBL,(gpl & 0xff));
outb((sc->el_base)+EL_GPBH,((gpl>>8)&0xff));
outb((sc->el_base)+EL_AC,EL_AC_TXFRX);
i = 20000;
while((inb((sc->el_base)+EL_AS) & EL_AS_TXBUSY) && (i>0))
i--;
if(i == 0) {
dprintf(("tx not ready\n"));
sc->arpcom.ac_if.if_oerrors++;
return(-1);
}
dprintf(("%d cycles.\n",(20000-i)));
return(0);
}
/* controller interrupt */
void elintr(int unit)
{
register struct el_softc *sc;
register base;
int stat, rxstat, len, done;
/* Get things pointing properly */
sc = &el_softc[unit];
base = sc->el_base;
dprintf(("elintr: "));
/* Check board status */
stat = inb(base+EL_AS);
if(stat & EL_AS_RXBUSY) {
(void)inb(base+EL_RXC);
outb(base+EL_AC,(EL_AC_IRQE|EL_AC_RX));
return;
}
done = 0;
while(!done) {
rxstat = inb(base+EL_RXS);
if(rxstat & EL_RXS_STALE) {
(void)inb(base+EL_RXC);
outb(base+EL_AC,(EL_AC_IRQE|EL_AC_RX));
return;
}
/* If there's an overflow, reinit the board. */
if(!(rxstat & EL_RXS_NOFLOW)) {
dprintf(("overflow.\n"));
el_hardreset(unit);
/* Put board back into receive mode */
if(sc->arpcom.ac_if.if_flags & IFF_PROMISC)
outb(base+EL_RXC,(EL_RXC_PROMISC|EL_RXC_AGF|EL_RXC_DSHORT|EL_RXC_DDRIB|EL_RXC_DOFLOW));
else
outb(base+EL_RXC,(EL_RXC_ABROAD|EL_RXC_AGF|EL_RXC_DSHORT|EL_RXC_DDRIB|EL_RXC_DOFLOW));
(void)inb(base+EL_AS);
outb(base+EL_RBC,0);
(void)inb(base+EL_RXC);
outb(base+EL_AC,(EL_AC_IRQE|EL_AC_RX));
return;
}
/* Incoming packet */
len = inb(base+EL_RBL);
len |= inb(base+EL_RBH) << 8;
dprintf(("receive len=%d rxstat=%x ",len,rxstat));
outb(base+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->arpcom.ac_if.if_flags & IFF_PROMISC)
outb(base+EL_RXC,(EL_RXC_PROMISC|EL_RXC_AGF|EL_RXC_DSHORT|EL_RXC_DDRIB|EL_RXC_DOFLOW));
else
outb(base+EL_RXC,(EL_RXC_ABROAD|EL_RXC_AGF|EL_RXC_DSHORT|EL_RXC_DDRIB|EL_RXC_DOFLOW));
(void)inb(base+EL_AS);
outb(base+EL_RBC,0);
(void)inb(base+EL_RXC);
outb(base+EL_AC,(EL_AC_IRQE|EL_AC_RX));
return;
}
sc->arpcom.ac_if.if_ipackets++;
/* Copy the data into our buffer */
outb(base+EL_GPBL,0);
outb(base+EL_GPBH,0);
insb(base+EL_BUF,sc->el_pktbuf,len);
outb(base+EL_RBC,0);
outb(base+EL_AC,EL_AC_RX);
dprintf(("%s-->",ether_sprintf(sc->el_pktbuf+6)));
dprintf(("%s\n",ether_sprintf(sc->el_pktbuf)));
/* Pass data up to upper levels */
len -= sizeof(struct ether_header);
elread(sc,(caddr_t)(sc->el_pktbuf),len);
/* Is there another packet? */
stat = inb(base+EL_AS);
/* If so, do it all again (i.e. don't set done to 1) */
if(!(stat & EL_AS_RXBUSY))
dprintf(("<rescan> "));
else
done = 1;
}
(void)inb(base+EL_RXC);
outb(base+EL_AC,(EL_AC_IRQE|EL_AC_RX));
return;
}
/* Pass a packet up to the higher levels. */
static inline void elread(struct el_softc *sc,caddr_t buf,int len)
{
register struct ether_header *eh;
struct mbuf *m;
eh = (struct ether_header *)buf;
#if NBPFILTER > 0
/*
* Check if there's a bpf filter listening on this interface.
* If so, hand off the raw packet to bpf.
*/
if(sc->bpf) {
bpf_tap(sc->bpf,buf,len+sizeof(struct ether_header));
/*
* Note that the interface cannot be in promiscuous mode if
* there are no bpf listeners. And if el are in promiscuous
* mode, el have to check if this packet is really ours.
*
* This test does not support multicasts.
*/
if((sc->arpcom.ac_if.if_flags & IFF_PROMISC)
&& bcmp(eh->ether_dhost,sc->arpcom.ac_enaddr,
sizeof(eh->ether_dhost)) != 0
&& bcmp(eh->ether_dhost,etherbroadcastaddr,
sizeof(eh->ether_dhost)) != 0)
return;
}
#endif
/*
* Pull packet off interface.
*/
m = elget(buf,len,0,&sc->arpcom.ac_if);
if(m == 0)
return;
ether_input(&sc->arpcom.ac_if,eh,m);
}
/*
* Pull read data off a interface.
* Len is length of data, with local net header stripped.
*/
struct mbuf *
elget(buf, totlen, off0, ifp)
caddr_t buf;
int totlen, off0;
struct ifnet *ifp;
{
struct mbuf *top, **mp, *m, *p;
int off = off0, len;
register caddr_t cp = buf;
char *epkt;
buf += sizeof(struct ether_header);
cp = buf;
epkt = cp + totlen;
if (off) {
cp += off + 2 * sizeof(u_short);
totlen -= 2 * sizeof(u_short);
}
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.
*/
int
el_ioctl(ifp, command, data)
register struct ifnet *ifp;
int command;
caddr_t data;
{
register struct ifaddr *ifa = (struct ifaddr *)data;
struct el_softc *sc = &el_softc[ifp->if_unit];
struct ifreq *ifr = (struct ifreq *)data;
int s, error = 0;
s = splimp();
switch (command) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
switch (ifa->ifa_addr->sa_family) {
#ifdef INET
case AF_INET:
el_init(ifp->if_unit); /* before arpwhohas */
arp_ifinit((struct arpcom *)ifp, ifa);
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->arpcom.ac_enaddr);
else {
/*
*
*/
bcopy((caddr_t)ina->x_host.c_host,
(caddr_t)sc->arpcom.ac_enaddr,
sizeof(sc->arpcom.ac_enaddr));
}
/*
* Set new address
*/
el_init(ifp->if_unit);
break;
}
#endif
default:
el_init(ifp->if_unit);
break;
}
break;
case SIOCGIFADDR:
{
struct sockaddr *sa;
sa = (struct sockaddr *)&ifr->ifr_data;
bcopy((caddr_t)sc->arpcom.ac_enaddr,
(caddr_t) sa->sa_data, ETHER_ADDR_LEN);
}
break;
case SIOCSIFFLAGS:
/*
* If interface is marked down and it is running, then stop it
*/
if (((ifp->if_flags & IFF_UP) == 0) &&
(ifp->if_flags & IFF_RUNNING)) {
el_stop(ifp->if_unit);
ifp->if_flags &= ~IFF_RUNNING;
} else {
/*
* If interface is marked up and it is stopped, then start it
*/
if ((ifp->if_flags & IFF_UP) &&
((ifp->if_flags & IFF_RUNNING) == 0))
el_init(ifp->if_unit);
}
case SIOCSIFMTU:
/*
* Set the interface MTU.
*/
if (ifr->ifr_mtu > ETHERMTU) {
error = EINVAL;
} else {
ifp->if_mtu = ifr->ifr_mtu;
}
break;
default:
error = EINVAL;
}
(void) splx(s);
return (error);
}
/* Device timeout routine */
void el_watchdog(int unit)
{
struct el_softc *sc;
sc = &el_softc[unit];
log(LOG_ERR,"el%d: device timeout\n",unit);
sc->arpcom.ac_if.if_oerrors++;
el_reset(unit);
}
#endif
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