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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.
*
* $FreeBSD$
*/
/* 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"
#include "opt_inet.h"
#include "opt_ipx.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <sys/bus.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <net/bpf.h>
#include <i386/isa/isa_device.h>
#include <i386/isa/if_elreg.h>
#ifndef COMPAT_OLDISA
#error "The el device requires the old isa compatibility shims"
#endif
/* For debugging convenience */
#ifdef EL_DEBUG
#define dprintf(x) printf x
#else
#define dprintf(x)
#endif
/* el_softc: per line info and status */
static struct el_softc {
struct arpcom arpcom; /* Ethernet common */
u_short el_base; /* Base I/O addr */
char el_pktbuf[EL_BUFSIZ]; /* Frame buffer */
} el_softc[NEL];
/* Prototypes */
static int el_attach(struct isa_device *);
static void el_init(void *);
static int el_ioctl(struct ifnet *,u_long,caddr_t);
static int el_probe(struct isa_device *);
static void el_start(struct ifnet *);
static void el_reset(void *);
static void el_watchdog(struct ifnet *);
static void el_stop(void *);
static int el_xmit(struct el_softc *,int);
static ointhand2_t elintr;
static __inline void elread(struct el_softc *,caddr_t,int);
static struct mbuf *elget(caddr_t,int,struct ifnet *);
static __inline void el_hardreset(void *);
/* isa_driver structure for autoconf */
struct isa_driver eldriver = {
INTR_TYPE_NET,
el_probe,
el_attach,
"el"
};
COMPAT_ISA_DRIVER(el, eldriver);
/* Probe routine. See if the card is there and at the right place. */
static 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 %6D\n",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);
}
}
/* Do a hardware reset of the 3c501. Do not call until after el_probe()! */
static __inline void
el_hardreset(xsc)
void *xsc;
{
register struct el_softc *sc = xsc;
register int base;
register int j;
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]);
}
/* 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.
*/
static int
el_attach(struct isa_device *idev)
{
struct el_softc *sc;
struct ifnet *ifp;
u_short base;
dprintf(("Attaching el%d...\n",idev->id_unit));
/* Get things pointing to the right places. */
idev->id_ointr = elintr;
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(sc);
/* Initialize ifnet structure */
ifp->if_softc = sc;
ifp->if_unit = idev->id_unit;
ifp->if_name = "el";
ifp->if_mtu = ETHERMTU;
ifp->if_output = ether_output;
ifp->if_start = el_start;
ifp->if_ioctl = el_ioctl;
ifp->if_watchdog = el_watchdog;
ifp->if_init = el_init;
ifp->if_flags = (IFF_BROADCAST | IFF_SIMPLEX);
/* Now we can attach the interface */
dprintf(("Attaching interface...\n"));
ether_ifattach(ifp, ETHER_BPF_SUPPORTED);
/* Print out some information for the user */
printf("el%d: 3c501 address %6D\n",idev->id_unit,
sc->arpcom.ac_enaddr, ":");
dprintf(("el_attach() finished.\n"));
return(1);
}
/* This routine resets the interface. */
static void
el_reset(xsc)
void *xsc;
{
struct el_softc *sc = xsc;
int s;
dprintf(("elreset()\n"));
s = splimp();
el_stop(sc);
el_init(sc);
splx(s);
}
static void el_stop(xsc)
void *xsc;
{
struct el_softc *sc = xsc;
outb(sc->el_base+EL_AC,0);
}
/* Initialize interface. */
static void
el_init(xsc)
void *xsc;
{
struct el_softc *sc = xsc;
struct ifnet *ifp;
int s;
u_short base;
/* Set up pointers */
ifp = &sc->arpcom.ac_if;
base = sc->el_base;
/* If address not known, do nothing. */
if(TAILQ_EMPTY(&ifp->if_addrhead)) /* XXX unlikely */
return;
s = splimp();
/* First, reset the board. */
dprintf(("Resetting board...\n"));
el_hardreset(sc);
/* 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!
*/
static 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 = ifp->if_softc;
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(sc->arpcom.ac_if.if_bpf)
bpf_tap(&sc->arpcom.ac_if, sc->el_pktbuf, len);
/* 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);
}
/* 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;
/*
* Put packet into an mbuf chain
*/
m = elget(buf,len,&sc->arpcom.ac_if);
if(m == 0)
return;
ether_input(&sc->arpcom.ac_if,eh,m);
}
/* controller interrupt */
static void
elintr(int unit)
{
register struct el_softc *sc;
register int 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(sc);
/* 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(("%6D-->",sc->el_pktbuf+6,":"));
dprintf(("%6D\n",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;
}
/*
* Pull read data off a interface.
* Len is length of data, with local net header stripped.
*/
static struct mbuf *
elget(buf, totlen, ifp)
caddr_t buf;
int totlen;
struct ifnet *ifp;
{
struct mbuf *top, **mp, *m;
int len;
register caddr_t cp;
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 = ⊤
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, command, data)
register struct ifnet *ifp;
u_long command;
caddr_t data;
{
int s, error = 0;
s = splimp();
switch (command) {
case SIOCSIFADDR:
case SIOCGIFADDR:
case SIOCSIFMTU:
error = ether_ioctl(ifp, command, data);
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_softc);
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_softc);
}
break;
default:
error = EINVAL;
}
(void) splx(s);
return (error);
}
/* Device timeout routine */
static void
el_watchdog(struct ifnet *ifp)
{
log(LOG_ERR,"el%d: device timeout\n", ifp->if_unit);
ifp->if_oerrors++;
el_reset(ifp->if_softc);
}
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