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NetBSD/sys/dev/isa/if_el.c

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/* $NetBSD: if_el.c,v 1.91 2015/04/13 16:33:24 riastradh 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_el.c,v 1.91 2015/04/13 16:33:24 riastradh Exp $");
#include "opt_inet.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 <sys/rndsource.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/if_ether.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/if_inarp.h>
#endif
#include <net/bpf.h>
#include <net/bpfdesc.h>
#include <sys/cpu.h>
#include <sys/intr.h>
#include <sys/bus.h>
#include <dev/isa/isavar.h>
#include <dev/isa/if_elreg.h>
/* for debugging convenience */
#ifdef EL_DEBUG
#define DPRINTF(x) printf x
#else
#define DPRINTF(x)
#endif
/*
* per-line info and status
*/
struct el_softc {
device_t sc_dev;
void *sc_ih;
struct ethercom sc_ethercom; /* ethernet common */
bus_space_tag_t sc_iot; /* bus space identifier */
bus_space_handle_t sc_ioh; /* i/o handle */
krndsource_t rnd_source;
};
/*
* prototypes
*/
int elintr(void *);
void elinit(struct el_softc *);
int elioctl(struct ifnet *, u_long, void *);
void elstart(struct ifnet *);
void elwatchdog(struct ifnet *);
void elreset(struct el_softc *);
void elstop(struct el_softc *);
static int el_xmit(struct el_softc *);
void elread(struct el_softc *, int);
struct mbuf *elget(struct el_softc *sc, int);
static inline void el_hardreset(struct el_softc *);
int elprobe(device_t, cfdata_t, void *);
void elattach(device_t, device_t, void *);
CFATTACH_DECL_NEW(el, sizeof(struct el_softc),
elprobe, elattach, NULL, NULL);
/*
* Probe routine.
*
* See if the card is there and at the right place.
* (XXX - cgd -- needs help)
*/
int
elprobe(device_t parent, cfdata_t match, void *aux)
{
struct isa_attach_args *ia = aux;
bus_space_tag_t iot = ia->ia_iot;
bus_space_handle_t ioh;
int iobase;
u_int8_t station_addr[ETHER_ADDR_LEN];
u_int8_t i;
int rval;
rval = 0;
if (ia->ia_nio < 1)
return (0);
if (ia->ia_nirq < 1)
return (0);
if (ISA_DIRECT_CONFIG(ia))
return (0);
iobase = ia->ia_io[0].ir_addr;
if (ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT)
return (0);
if (ia->ia_irq[0].ir_irq == ISA_UNKNOWN_IRQ)
return (0);
/* First check the base. */
if (iobase < 0x200 || iobase > 0x3f0)
return 0;
/* Map i/o space. */
if (bus_space_map(iot, iobase, 16, 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_nio = 1;
ia->ia_io[0].ir_size = 16;
ia->ia_nirq = 1;
ia->ia_niomem = 0;
ia->ia_ndrq = 0;
rval = 1;
out:
bus_space_unmap(iot, ioh, 16);
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(device_t parent, device_t self, void *aux)
{
struct el_softc *sc = device_private(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_ethercom.ec_if;
u_int8_t myaddr[ETHER_ADDR_LEN];
u_int8_t i;
sc->sc_dev = self;
printf("\n");
DPRINTF(("Attaching %s...\n", device_xname(sc->sc_dev)));
/* Map i/o space. */
if (bus_space_map(iot, ia->ia_io[0].ir_addr, 16, 0, &ioh)) {
aprint_error_dev(self, "can't map i/o space\n");
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);
myaddr[i] = bus_space_read_1(iot, ioh, EL_EAW);
}
/* Stop the board. */
elstop(sc);
/* Initialize ifnet structure. */
strlcpy(ifp->if_xname, device_xname(sc->sc_dev), 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;
IFQ_SET_READY(&ifp->if_snd);
/* Now we can attach the interface. */
DPRINTF(("Attaching interface...\n"));
if_attach(ifp);
ether_ifattach(ifp, myaddr);
/* Print out some information for the user. */
printf("%s: address %s\n", device_xname(self), ether_sprintf(myaddr));
sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq[0].ir_irq,
IST_EDGE, IPL_NET, elintr, sc);
DPRINTF(("Attaching to random...\n"));
rnd_attach_source(&sc->rnd_source, device_xname(sc->sc_dev),
RND_TYPE_NET, RND_FLAG_DEFAULT);
DPRINTF(("elattach() finished.\n"));
}
/*
* Reset interface.
*/
void
elreset(struct el_softc *sc)
{
int s;
DPRINTF(("elreset()\n"));
s = splnet();
elstop(sc);
elinit(sc);
splx(s);
}
/*
* Stop interface.
*/
void
elstop(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(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,
CLLADDR(sc->sc_ethercom.ec_if.if_sadl)[i]);
}
/*
* Initialize interface.
*/
void
elinit(struct el_softc *sc)
{
struct ifnet *ifp = &sc->sc_ethercom.ec_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(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. */
IFQ_DEQUEUE(&ifp->if_snd, m0);
/* If there's nothing to send, return. */
if (m0 == 0)
break;
/* Give the packet to the bpf, if any. */
bpf_mtap(ifp, m0);
/* 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 - ETHER_CRC_LEN);
#ifdef DIAGNOSTIC
if ((off & 0xffff) != off)
printf("%s: bogus off 0x%x\n",
device_xname(sc->sc_dev), 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);
for (i = 0;
i < ETHER_MIN_LEN - ETHER_CRC_LEN - m0->m_pkthdr.len; i++)
bus_space_write_1(iot, ioh, EL_BUF, 0);
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(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(void *arg)
{
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_ethercom.ec_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;
rnd_add_uint32(&sc->rnd_source, rxstat);
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(struct el_softc *sc, int len)
{
struct ifnet *ifp = &sc->sc_ethercom.ec_if;
struct mbuf *m;
if (len <= sizeof(struct ether_header) ||
len > ETHER_MAX_LEN) {
printf("%s: invalid packet size %d; dropping\n",
device_xname(sc->sc_dev), len);
ifp->if_ierrors++;
return;
}
/* Pull packet off interface. */
m = elget(sc, len);
if (m == 0) {
ifp->if_ierrors++;
return;
}
ifp->if_ipackets++;
/*
* Check if there's a BPF listener on this interface.
* If so, hand off the raw packet to BPF.
*/
bpf_mtap(ifp, m);
(*ifp->if_input)(ifp, 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(struct el_softc *sc, int totlen)
{
struct ifnet *ifp = &sc->sc_ethercom.ec_if;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
struct mbuf *m, *m0, *newm;
int len;
MGETHDR(m0, M_DONTWAIT, MT_DATA);
if (m0 == 0)
return (0);
m0->m_pkthdr.rcvif = ifp;
m0->m_pkthdr.len = totlen;
len = MHLEN;
m = m0;
bus_space_write_1(iot, ioh, EL_GPBL, 0);
bus_space_write_1(iot, ioh, EL_GPBH, 0);
while (totlen > 0) {
if (totlen >= MINCLSIZE) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0)
goto bad;
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;
if (totlen > 0) {
MGET(newm, M_DONTWAIT, MT_DATA);
if (newm == 0)
goto bad;
len = MLEN;
m = m->m_next = newm;
}
}
bus_space_write_1(iot, ioh, EL_RBC, 0);
bus_space_write_1(iot, ioh, EL_AC, EL_AC_RX);
return (m0);
bad:
m_freem(m0);
return (0);
}
/*
* Process an ioctl request. This code needs some work - it looks pretty ugly.
*/
int
elioctl(struct ifnet *ifp, u_long cmd, void *data)
{
struct el_softc *sc = ifp->if_softc;
struct ifaddr *ifa = (struct ifaddr *)data;
int s, error = 0;
s = splnet();
switch (cmd) {
case SIOCINITIFADDR:
ifp->if_flags |= IFF_UP;
elinit(sc);
switch (ifa->ifa_addr->sa_family) {
#ifdef INET
case AF_INET:
arp_ifinit(ifp, ifa);
break;
#endif
default:
break;
}
break;
case SIOCSIFFLAGS:
if ((error = ifioctl_common(ifp, cmd, data)) != 0)
break;
/* XXX re-use ether_ioctl() */
switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) {
case IFF_RUNNING:
/*
* If interface is marked down and it is running, then
* stop it.
*/
elstop(sc);
ifp->if_flags &= ~IFF_RUNNING;
break;
case IFF_UP:
/*
* If interface is marked up and it is stopped, then
* start it.
*/
elinit(sc);
break;
default:
/*
* Some other important flag might have changed, so
* reset.
*/
elreset(sc);
break;
}
break;
default:
error = ether_ioctl(ifp, cmd, data);
break;
}
splx(s);
return error;
}
/*
* Device timeout routine.
*/
void
elwatchdog(struct ifnet *ifp)
{
struct el_softc *sc = ifp->if_softc;
log(LOG_ERR, "%s: device timeout\n", device_xname(sc->sc_dev));
sc->sc_ethercom.ec_if.if_oerrors++;
elreset(sc);
}
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