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NetBSD/sys/dev/isa/if_el.c

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/* $NetBSD: if_el.c,v 1.43 1996/10/21 22:40:53 thorpej Exp $ */
/*
* 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
*/
/*
* Bugs/possible improvements:
* - Does not currently support DMA
* - Does not currently support multicasts
*/
#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/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/intr.h>
#include <machine/bus.h>
#include <dev/isa/isavar.h>
#include <dev/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;
void *sc_ih;
struct arpcom sc_arpcom; /* ethernet common */
bus_space_tag_t sc_iot; /* bus space identifier */
bus_space_handle_t sc_ioh; /* i/o handle */
};
/*
* prototypes
*/
int elintr __P((void *));
void elinit __P((struct el_softc *));
int elioctl __P((struct ifnet *, u_long, caddr_t));
void elstart __P((struct ifnet *));
void elwatchdog __P((struct ifnet *));
void elreset __P((struct el_softc *));
void elstop __P((struct el_softc *));
static int el_xmit __P((struct el_softc *));
void elread __P((struct el_softc *, int));
struct mbuf *elget __P((struct el_softc *sc, int));
static inline void el_hardreset __P((struct el_softc *));
int elprobe __P((struct device *, void *, void *));
void elattach __P((struct device *, struct device *, void *));
struct cfattach el_ca = {
sizeof(struct el_softc), elprobe, elattach
};
struct cfdriver el_cd = {
NULL, "el", DV_IFNET
};
/*
* Probe routine.
*
* See if the card is there and at the right place.
* (XXX - cgd -- needs help)
*/
int
elprobe(parent, match, aux)
struct device *parent;
void *match, *aux;
{
struct isa_attach_args *ia = aux;
bus_space_tag_t iot = ia->ia_iot;
bus_space_handle_t ioh;
int iobase = ia->ia_iobase;
u_int8_t station_addr[ETHER_ADDR_LEN];
u_int8_t i;
int rval;
rval = 0;
/* First check the base. */
if (iobase < 0x280 || iobase > 0x3f0)
return 0;
/* Map i/o space. */
if (bus_space_map(iot, iobase, 4, 0, &ioh))
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", iobase));
/* Reset the board. */
DPRINTF(("Resetting board...\n"));
bus_space_write_1(iot, ioh, EL_AC, EL_AC_RESET);
delay(5);
bus_space_write_1(iot, ioh, EL_AC, 0);
/* Now read the address. */
DPRINTF(("Reading station address...\n"));
for (i = 0; i < ETHER_ADDR_LEN; i++) {
bus_space_write_1(iot, ioh, EL_GPBL, i);
station_addr[i] = bus_space_read_1(iot, ioh, 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"));
goto out;
}
DPRINTF(("Vendor code ok.\n"));
ia->ia_iosize = 4; /* XXX */
ia->ia_msize = 0;
rval = 1;
out:
bus_space_unmap(iot, ioh, 4);
return rval;
}
/*
* 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;
bus_space_tag_t iot = ia->ia_iot;
bus_space_handle_t ioh;
struct ifnet *ifp = &sc->sc_arpcom.ac_if;
u_int8_t i;
printf("\n");
DPRINTF(("Attaching %s...\n", sc->sc_dev.dv_xname));
/* Map i/o space. */
if (bus_space_map(iot, ia->ia_iobase, ia->ia_iosize, 0, &ioh)) {
printf("%s: can't map i/o space\n", self->dv_xname);
return;
}
sc->sc_iot = iot;
sc->sc_ioh = ioh;
/* Reset the board. */
bus_space_write_1(iot, ioh, EL_AC, EL_AC_RESET);
delay(5);
bus_space_write_1(iot, ioh, EL_AC, 0);
/* Now read the address. */
for (i = 0; i < ETHER_ADDR_LEN; i++) {
bus_space_write_1(iot, ioh, EL_GPBL, i);
sc->sc_arpcom.ac_enaddr[i] = bus_space_read_1(iot, ioh, EL_EAW);
}
/* Stop the board. */
elstop(sc);
/* Initialize ifnet structure. */
bcopy(sc->sc_dev.dv_xname, ifp->if_xname, IFNAMSIZ);
ifp->if_softc = sc;
ifp->if_start = elstart;
ifp->if_ioctl = elioctl;
ifp->if_watchdog = elwatchdog;
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", self->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 = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE,
IPL_NET, elintr, sc);
DPRINTF(("elattach() finished.\n"));
}
/*
* Reset interface.
*/
void
elreset(sc)
struct el_softc *sc;
{
int s;
DPRINTF(("elreset()\n"));
s = splnet();
elstop(sc);
elinit(sc);
splx(s);
}
/*
* Stop interface.
*/
void
elstop(sc)
struct el_softc *sc;
{
bus_space_write_1(sc->sc_iot, sc->sc_ioh, 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;
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
int i;
bus_space_write_1(iot, ioh, EL_AC, EL_AC_RESET);
delay(5);
bus_space_write_1(iot, ioh, EL_AC, 0);
for (i = 0; i < ETHER_ADDR_LEN; i++)
bus_space_write_1(iot, ioh, i, sc->sc_arpcom.ac_enaddr[i]);
}
/*
* Initialize interface.
*/
void
elinit(sc)
struct el_softc *sc;
{
struct ifnet *ifp = &sc->sc_arpcom.ac_if;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
/* First, reset the board. */
el_hardreset(sc);
/* Configure rx. */
DPRINTF(("Configuring rx...\n"));
if (ifp->if_flags & IFF_PROMISC)
bus_space_write_1(iot, ioh, EL_RXC,
EL_RXC_AGF | EL_RXC_DSHORT | EL_RXC_DDRIB |
EL_RXC_DOFLOW | EL_RXC_PROMISC);
else
bus_space_write_1(iot, ioh, EL_RXC,
EL_RXC_AGF | EL_RXC_DSHORT | EL_RXC_DDRIB |
EL_RXC_DOFLOW | EL_RXC_ABROAD);
bus_space_write_1(iot, ioh, EL_RBC, 0);
/* Configure TX. */
DPRINTF(("Configuring tx...\n"));
bus_space_write_1(iot, ioh, EL_TXC, 0);
/* Start reception. */
DPRINTF(("Starting reception...\n"));
bus_space_write_1(iot, ioh, EL_AC, EL_AC_IRQE | EL_AC_RX);
/* Set flags appropriately. */
ifp->if_flags |= IFF_RUNNING;
ifp->if_flags &= ~IFF_OACTIVE;
/* And start output. */
elstart(ifp);
}
/*
* Start output on interface. Get datagrams from the queue and output them,
* giving the receiver a chance between datagrams. Call only from splnet or
* interrupt level!
*/
void
elstart(ifp)
struct ifnet *ifp;
{
struct el_softc *sc = ifp->if_softc;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
struct mbuf *m, *m0;
int s, i, off, retries;
DPRINTF(("elstart()...\n"));
s = splnet();
/* Don't do anything if output is active. */
if ((ifp->if_flags & IFF_OACTIVE) != 0) {
splx(s);
return;
}
ifp->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(&ifp->if_snd, m0);
/* If there's nothing to send, return. */
if (m0 == 0)
break;
#if NBPFILTER > 0
/* Give the packet to the bpf, if any. */
if (ifp->if_bpf)
bpf_mtap(ifp->if_bpf, m0);
#endif
/* Disable the receiver. */
bus_space_write_1(iot, ioh, EL_AC, EL_AC_HOST);
bus_space_write_1(iot, ioh, EL_RBC, 0);
/* Transfer datagram to board. */
DPRINTF(("el: xfr pkt length=%d...\n", m0->m_pkthdr.len));
off = EL_BUFSIZ - max(m0->m_pkthdr.len, ETHER_MIN_LEN);
#ifdef DIAGNOSTIC
if ((off & 0xffff) != off)
printf("%s: bogus off 0x%x\n",
sc->sc_dev.dv_xname, off);
#endif
bus_space_write_1(iot, ioh, EL_GPBL, off & 0xff);
bus_space_write_1(iot, ioh, EL_GPBH, (off >> 8) & 0xff);
/* Copy the datagram to the buffer. */
for (m = m0; m != 0; m = m->m_next)
bus_space_write_multi_1(iot, ioh, EL_BUF,
mtod(m, u_int8_t *), m->m_len);
m_freem(m0);
/* Now transmit the datagram. */
retries = 0;
for (;;) {
bus_space_write_1(iot, ioh, EL_GPBL, off & 0xff);
bus_space_write_1(iot, ioh, EL_GPBH, (off >> 8) & 0xff);
if (el_xmit(sc)) {
ifp->if_oerrors++;
break;
}
/* Check out status. */
i = bus_space_read_1(iot, ioh, EL_TXS);
DPRINTF(("tx status=0x%x\n", i));
if ((i & EL_TXS_READY) == 0) {
DPRINTF(("el: err txs=%x\n", i));
if (i & (EL_TXS_COLL | EL_TXS_COLL16)) {
ifp->if_collisions++;
if ((i & EL_TXC_DCOLL16) == 0 &&
retries < 15) {
retries++;
bus_space_write_1(iot, ioh,
EL_AC, EL_AC_HOST);
}
} else {
ifp->if_oerrors++;
break;
}
} else {
ifp->if_opackets++;
break;
}
}
/*
* Now give the card a chance to receive.
* Gotta love 3c501s...
*/
(void)bus_space_read_1(iot, ioh, EL_AS);
bus_space_write_1(iot, ioh, EL_AC, EL_AC_IRQE | EL_AC_RX);
splx(s);
/* Interrupt here. */
s = splnet();
}
(void)bus_space_read_1(iot, ioh, EL_AS);
bus_space_write_1(iot, ioh, EL_AC, EL_AC_IRQE | EL_AC_RX);
ifp->if_flags &= ~IFF_OACTIVE;
splx(s);
}
/*
* This function actually attempts to transmit a datagram downloaded to the
* board. Call at splnet or interrupt, after downloading data! Returns 0 on
* success, non-0 on failure.
*/
static int
el_xmit(sc)
struct el_softc *sc;
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
int i;
/*
* XXX
* This busy-waits for the tx completion. Can we get an interrupt
* instead?
*/
DPRINTF(("el: xmit..."));
bus_space_write_1(iot, ioh, EL_AC, EL_AC_TXFRX);
i = 20000;
while ((bus_space_read_1(iot, ioh, EL_AS) & EL_AS_TXBUSY) && (i > 0))
i--;
if (i == 0) {
DPRINTF(("tx not ready\n"));
return -1;
}
DPRINTF(("%d cycles.\n", 20000 - i));
return 0;
}
/*
* Controller interrupt.
*/
int
elintr(arg)
void *arg;
{
register struct el_softc *sc = arg;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
u_int8_t rxstat;
int len;
DPRINTF(("elintr: "));
/* Check board status. */
if ((bus_space_read_1(iot, ioh, EL_AS) & EL_AS_RXBUSY) != 0) {
(void)bus_space_read_1(iot, ioh, EL_RXC);
bus_space_write_1(iot, ioh, EL_AC, EL_AC_IRQE | EL_AC_RX);
return 0;
}
for (;;) {
rxstat = bus_space_read_1(iot, ioh, EL_RXS);
if (rxstat & EL_RXS_STALE)
break;
/* 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)
bus_space_write_1(iot, ioh, EL_RXC,
EL_RXC_AGF | EL_RXC_DSHORT | EL_RXC_DDRIB |
EL_RXC_DOFLOW | EL_RXC_PROMISC);
else
bus_space_write_1(iot, ioh, EL_RXC,
EL_RXC_AGF | EL_RXC_DSHORT | EL_RXC_DDRIB |
EL_RXC_DOFLOW | EL_RXC_ABROAD);
(void)bus_space_read_1(iot, ioh, EL_AS);
bus_space_write_1(iot, ioh, EL_RBC, 0);
break;
}
/* Incoming packet. */
len = bus_space_read_1(iot, ioh, EL_RBL);
len |= bus_space_read_1(iot, ioh, EL_RBH) << 8;
DPRINTF(("receive len=%d rxstat=%x ", len, rxstat));
bus_space_write_1(iot, ioh, EL_AC, EL_AC_HOST);
/* Pass data up to upper levels. */
elread(sc, len);
/* Is there another packet? */
if ((bus_space_read_1(iot, ioh, EL_AS) & EL_AS_RXBUSY) != 0)
break;
DPRINTF(("<rescan> "));
}
(void)bus_space_read_1(iot, ioh, EL_RXC);
bus_space_write_1(iot, ioh, EL_AC, EL_AC_IRQE | EL_AC_RX);
return 1;
}
/*
* Pass a packet to the higher levels.
*/
void
elread(sc, len)
register struct el_softc *sc;
int len;
{
struct ifnet *ifp = &sc->sc_arpcom.ac_if;
struct mbuf *m;
struct ether_header *eh;
if (len <= sizeof(struct ether_header) ||
len > ETHER_MAX_LEN) {
printf("%s: invalid packet size %d; dropping\n",
sc->sc_dev.dv_xname, len);
ifp->if_ierrors++;
return;
}
/* Pull packet off interface. */
m = elget(sc, len);
if (m == 0) {
ifp->if_ierrors++;
return;
}
ifp->if_ipackets++;
/* We assume that the header fit entirely in one mbuf. */
eh = mtod(m, struct ether_header *);
#if NBPFILTER > 0
/*
* Check if there's a BPF listener on this interface.
* If so, hand off the raw packet to BPF.
*/
if (ifp->if_bpf) {
bpf_mtap(ifp->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 ((ifp->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
/* We assume that the header fit entirely in one mbuf. */
m_adj(m, sizeof(struct ether_header));
ether_input(ifp, 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(sc, totlen)
struct el_softc *sc;
int totlen;
{
struct ifnet *ifp = &sc->sc_arpcom.ac_if;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
struct mbuf *top, **mp, *m;
int len;
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == 0)
return 0;
m->m_pkthdr.rcvif = ifp;
m->m_pkthdr.len = totlen;
len = MHLEN;
top = 0;
mp = &top;
bus_space_write_1(iot, ioh, EL_GPBL, 0);
bus_space_write_1(iot, ioh, EL_GPBH, 0);
while (totlen > 0) {
if (top) {
MGET(m, M_DONTWAIT, MT_DATA);
if (m == 0) {
m_freem(top);
return 0;
}
len = MLEN;
}
if (totlen >= MINCLSIZE) {
MCLGET(m, M_DONTWAIT);
if (m->m_flags & M_EXT)
len = MCLBYTES;
}
m->m_len = len = min(totlen, len);
bus_space_read_multi_1(iot, ioh, EL_BUF, mtod(m, u_int8_t *), len);
totlen -= len;
*mp = m;
mp = &m->m_next;
}
bus_space_write_1(iot, ioh, EL_RBC, 0);
bus_space_write_1(iot, ioh, EL_AC, EL_AC_RX);
return top;
}
/*
* Process an ioctl request. This code needs some work - it looks pretty ugly.
*/
int
elioctl(ifp, cmd, data)
register struct ifnet *ifp;
u_long cmd;
caddr_t data;
{
struct el_softc *sc = ifp->if_softc;
struct ifaddr *ifa = (struct ifaddr *)data;
int s, error = 0;
s = splnet();
switch (cmd) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
switch (ifa->ifa_addr->sa_family) {
#ifdef INET
case AF_INET:
elinit(sc);
arp_ifinit(&sc->sc_arpcom, 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->sc_arpcom.ac_enaddr);
else
bcopy(ina->x_host.c_host,
sc->sc_arpcom.ac_enaddr,
sizeof(sc->sc_arpcom.ac_enaddr));
/* Set new address. */
elinit(sc);
break;
}
#endif
default:
elinit(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.
*/
elstop(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.
*/
elinit(sc);
} else {
/*
* Some other important flag might have changed, so
* reset.
*/
elreset(sc);
}
break;
default:
error = EINVAL;
break;
}
splx(s);
return error;
}
/*
* Device timeout routine.
*/
void
elwatchdog(ifp)
struct ifnet *ifp;
{
struct el_softc *sc = ifp->if_softc;
log(LOG_ERR, "%s: device timeout\n", sc->sc_dev.dv_xname);
sc->sc_arpcom.ac_if.if_oerrors++;
elreset(sc);
}
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