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NetBSD/sys/arch/mac68k/dev/if_sn.c

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/* $NetBSD: if_sn.c,v 1.13 1997/04/25 03:40:10 briggs Exp $ */
/*
* National Semiconductor SONIC Driver
* Copyright (c) 1991 Algorithmics Ltd (http://www.algor.co.uk)
* You may use, copy, and modify this program so long as you retain the
* copyright line.
*
* This driver has been substantially modified since Algorithmics donated
* it.
*
* Denton Gentry <denny1@home.com>
* and also
* Yanagisawa Takeshi <yanagisw@aa.ap.titech.ac.jp>
* did the work to get this running on the Macintosh.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/buf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/device.h>
#include <net/if.h>
#include <net/if_dl.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 <vm/vm.h>
extern int kvtop(caddr_t addr);
#include "bpfilter.h"
#if NBPFILTER > 0
#include <net/bpf.h>
#include <net/bpfdesc.h>
#endif
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/viareg.h>
#include <mac68k/dev/if_snreg.h>
#include <mac68k/dev/if_snvar.h>
static void snwatchdog __P((struct ifnet *));
static int sninit __P((struct sn_softc *sc));
static int snstop __P((struct sn_softc *sc));
static int snioctl __P((struct ifnet *ifp, u_long cmd, caddr_t data));
static void snstart __P((struct ifnet *ifp));
static void snreset __P((struct sn_softc *sc));
static void caminitialise __P((struct sn_softc *));
static void camentry __P((struct sn_softc *, int, u_char *ea));
static void camprogram __P((struct sn_softc *));
static void initialise_tda __P((struct sn_softc *));
static void initialise_rda __P((struct sn_softc *));
static void initialise_rra __P((struct sn_softc *));
static void initialise_tba __P((struct sn_softc *));
#ifdef DEBUG
static void camdump __P((struct sn_softc *sc));
#endif
static void sonictxint __P((struct sn_softc *));
static void sonicrxint __P((struct sn_softc *));
static __inline__ int sonicput __P((struct sn_softc *sc, struct mbuf *m0));
static __inline__ int sonic_read __P((struct sn_softc *, caddr_t, int));
static __inline__ struct mbuf *sonic_get __P((struct sn_softc *,
struct ether_header *, int));
struct cfdriver sn_cd = {
NULL, "sn", DV_IFNET
};
#undef assert
#undef _assert
#ifdef NDEBUG
#define assert(e) ((void)0)
#define _assert(e) ((void)0)
#else
#define _assert(e) assert(e)
#ifdef __STDC__
#define assert(e) ((e) ? (void)0 : __assert("sn ", __FILE__, __LINE__, #e))
#else /* PCC */
#define assert(e) ((e) ? (void)0 : __assert("sn "__FILE__, __LINE__, "e"))
#endif
#endif
int sndebug = 0;
/*
* SONIC buffers need to be aligned 16 or 32 bit aligned.
* These macros calculate and verify alignment.
*/
#define ROUNDUP(p, N) (((int) p + N - 1) & ~(N - 1))
#define SOALIGN(m, array) (m ? (ROUNDUP(array, 4)) : (ROUNDUP(array, 2)))
#define LOWER(x) ((unsigned)(x) & 0xffff)
#define UPPER(x) ((unsigned)(x) >> 16)
/*
* Interface exists: make available by filling in network interface
* record. System will initialize the interface when it is ready
* to accept packets.
*/
int
snsetup(sc, lladdr)
struct sn_softc *sc;
u_int8_t *lladdr;
{
struct ifnet *ifp = &sc->sc_if;
u_char *p;
u_char *pp;
int i;
/*
* XXX if_sn.c is intended to be MI. Should it allocate memory
* for its descriptor areas, or expect the MD attach code
* to do that?
*/
sc->space = malloc((SN_NPAGES + 1) * NBPG, M_DEVBUF, M_WAITOK);
if (sc->space == NULL) {
printf ("%s: memory allocation for descriptors failed\n",
sc->sc_dev.dv_xname);
return (1);
}
/*
* Put the pup in reset mode (sninit() will fix it later),
* stop the timer, disable all interrupts and clear any interrupts.
*/
NIC_PUT(sc, SNR_CR, CR_STP);
wbflush();
NIC_PUT(sc, SNR_CR, CR_RST);
wbflush();
NIC_PUT(sc, SNR_IMR, 0);
wbflush();
NIC_PUT(sc, SNR_ISR, ISR_ALL);
wbflush();
/*
* because the SONIC is basically 16bit device it 'concatenates'
* a higher buffer address to a 16 bit offset--this will cause wrap
* around problems near the end of 64k !!
*/
p = sc->space;
pp = (u_char *)ROUNDUP ((int)p, NBPG);
p = pp;
/*
* Disable caching on the SONIC's data space.
* The pages might not be physically contiguous, so set
* each page individually.
*/
for (i = 0; i < SN_NPAGES; i++) {
physaccess (p, (caddr_t)kvtop(p), NBPG, PG_V | PG_RW | PG_CI);
p += NBPG;
}
p = pp;
for (i = 0; i < NRRA; i++) {
sc->p_rra[i] = (void *)p;
sc->v_rra[i] = kvtop(p);
p += RXRSRC_SIZE(sc);
}
sc->v_rea = kvtop(p);
p = (u_char *)SOALIGN(sc, p);
sc->p_cda = (void *)(p);
sc->v_cda = kvtop(p);
p += CDA_SIZE(sc);
p = (u_char *)SOALIGN(sc, p);
for (i = 0; i < NTDA; i++) {
struct mtd *mtdp = &sc->mtda[i];
mtdp->mtd_txp = (void *)p;
mtdp->mtd_vtxp = kvtop(p);
p += TXP_SIZE(sc);
}
p = (u_char *)SOALIGN(sc, p);
if ((p - pp) > NBPG) {
printf ("%s: sizeof RRA (%ld) + CDA (%ld) +"
"TDA (%ld) > NBPG (%d). Punt!\n",
sc->sc_dev.dv_xname,
(ulong)sc->p_cda - (ulong)sc->p_rra[0],
(ulong)sc->mtda[0].mtd_txp - (ulong)sc->p_cda,
(ulong)p - (ulong)sc->mtda[0].mtd_txp,
NBPG);
return(1);
}
p = pp + NBPG;
pp = p;
if ((NRDA * RXPKT_SIZE(sc)) > NBPG) {
printf ("%s: sizeof NRDA (%d) > NBPG (%d). Punt!\n",
sc->sc_dev.dv_xname,
NRDA * RXPKT_SIZE(sc), NBPG);
return (1);
}
for (i = 0; i < NRDA; i++) {
sc->p_rda[i] = (void *) p;
sc->v_rda[i] = kvtop(p);
p += RXPKT_SIZE(sc);
}
p = (u_char *)SOALIGN(sc, p);
p = pp + NBPG;
for (i = 0; i < NRBA; i++) {
sc->rbuf[i] = (caddr_t)p;
p += NBPG;
}
for (i = 0; i < NTXB; i+=2) {
sc->tbuf[i] = (caddr_t)p;
sc->tbuf[i+1] = (caddr_t)(p + (NBPG/2));
sc->vtbuf[i] = kvtop(sc->tbuf[i]);
sc->vtbuf[i+1] = kvtop(sc->tbuf[i+1]);
p += NBPG;
}
#ifdef DEBUG
camdump(sc);
#endif
printf(" address %s\n", ether_sprintf(lladdr));
#ifdef DEBUG
printf("%s: buffers: rra=%p cda=0x%x rda=0x%x tda=0x%x\n",
sc->sc_dev.dv_xname, sc->p_rra[0], sc->p_cda,
sc->p_rda[0], sc->mtda[0].mtd_txp);
#endif
bcopy(sc->sc_dev.dv_xname, ifp->if_xname, IFNAMSIZ);
ifp->if_softc = sc;
ifp->if_ioctl = snioctl;
ifp->if_start = snstart;
ifp->if_flags =
IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS | IFF_MULTICAST;
ifp->if_watchdog = snwatchdog;
#if NBPFILTER > 0
bpfattach(&ifp->if_bpf, ifp, DLT_EN10MB, sizeof(struct ether_header));
#endif
if_attach(ifp);
ether_ifattach(ifp, lladdr);
return (0);
}
static int
snioctl(ifp, cmd, data)
struct ifnet *ifp;
u_long cmd;
caddr_t data;
{
struct ifaddr *ifa;
struct ifreq *ifr;
struct sn_softc *sc = ifp->if_softc;
int s = splnet(), err = 0;
int temp;
switch (cmd) {
case SIOCSIFADDR:
ifa = (struct ifaddr *)data;
ifp->if_flags |= IFF_UP;
switch (ifa->ifa_addr->sa_family) {
#ifdef INET
case AF_INET:
(void)sninit(ifp->if_softc);
arp_ifinit(ifp, ifa);
break;
#endif
default:
(void)sninit(ifp->if_softc);
break;
}
break;
case SIOCSIFFLAGS:
if ((ifp->if_flags & IFF_UP) == 0 &&
ifp->if_flags & IFF_RUNNING) {
snstop(ifp->if_softc);
ifp->if_flags &= ~IFF_RUNNING;
} else if (ifp->if_flags & IFF_UP &&
(ifp->if_flags & IFF_RUNNING) == 0)
(void)sninit(ifp->if_softc);
/*
* If the state of the promiscuous bit changes, the interface
* must be reset to effect the change.
*/
if (((ifp->if_flags ^ sc->sc_iflags) & IFF_PROMISC) &&
(ifp->if_flags & IFF_RUNNING)) {
sc->sc_iflags = ifp->if_flags;
printf("change in flags\n");
temp = sc->sc_if.if_flags & IFF_UP;
snreset(sc);
sc->sc_if.if_flags |= temp;
snstart(ifp);
}
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
ifr = (struct ifreq *) data;
if (cmd == SIOCADDMULTI)
err = ether_addmulti(ifr, &sc->sc_ethercom);
else
err = ether_delmulti(ifr, &sc->sc_ethercom);
if (err == ENETRESET) {
/*
* Multicast list has changed; set the hardware
* filter accordingly. But remember UP flag!
*/
temp = sc->sc_if.if_flags & IFF_UP;
snreset(sc);
sc->sc_if.if_flags |= temp;
err = 0;
}
break;
default:
err = EINVAL;
}
splx(s);
return (err);
}
/*
* Encapsulate a packet of type family for the local net.
*/
static void
snstart(ifp)
struct ifnet *ifp;
{
struct sn_softc *sc = ifp->if_softc;
struct mbuf *m;
int len;
if ((ifp->if_flags & (IFF_RUNNING | IFF_OACTIVE)) != IFF_RUNNING)
return;
outloop:
/* Check for room in the xmit buffer. */
if (sc->txb_inuse == sc->txb_cnt) {
ifp->if_flags |= IFF_OACTIVE;
return;
}
IF_DEQUEUE(&ifp->if_snd, m);
if (m == 0)
return;
/* We need the header for m_pkthdr.len. */
if ((m->m_flags & M_PKTHDR) == 0)
panic("%s: snstart: no header mbuf", sc->sc_dev.dv_xname);
#if NBPFILTER > 0
/*
* If bpf is listening on this interface, let it
* see the packet before we commit it to the wire.
*/
if (ifp->if_bpf)
bpf_mtap(ifp->if_bpf, m);
#endif
/*
* If there is nothing in the o/p queue, and there is room in
* the Tx ring, then send the packet directly. Otherwise append
* it to the o/p queue.
*/
if ((len = sonicput(sc, m)) > 0) {
len = m->m_pkthdr.len;
m_freem(m);
} else {
IF_PREPEND(&ifp->if_snd, m);
return;
}
/* Point to next buffer slot and wrap if necessary. */
if (++sc->txb_new == sc->txb_cnt)
sc->txb_new = 0;
sc->txb_inuse++;
ifp->if_opackets++; /* # of pkts */
sc->sc_sum.ls_opacks++; /* # of pkts */
/* Jump back for possibly more punishment. */
goto outloop;
}
/*
* reset and restart the SONIC. Called in case of fatal
* hardware/software errors.
*/
static void
snreset(sc)
struct sn_softc *sc;
{
snstop(sc);
sninit(sc);
}
static int
sninit(sc)
struct sn_softc *sc;
{
u_long s_rcr;
int s;
if (sc->sc_if.if_flags & IFF_RUNNING)
/* already running */
return (0);
s = splnet();
NIC_PUT(sc, SNR_CR, CR_RST); /* DCR only accessable in reset mode! */
/* config it */
NIC_PUT(sc, SNR_DCR, sc->snr_dcr);
NIC_PUT(sc, SNR_DCR2, sc->snr_dcr2);
s_rcr = RCR_BRD | RCR_LBNONE;
if (sc->sc_if.if_flags & IFF_PROMISC)
s_rcr |= RCR_PRO;
if (sc->sc_if.if_flags & IFF_ALLMULTI)
s_rcr |= RCR_AMC;
NIC_PUT(sc, SNR_RCR, s_rcr);
NIC_PUT(sc, SNR_IMR, (IMR_PRXEN | IMR_PTXEN | IMR_TXEREN | IMR_LCDEN));
/* clear pending interrupts */
NIC_PUT(sc, SNR_ISR, ISR_ALL);
/* clear tally counters */
NIC_PUT(sc, SNR_CRCT, -1);
NIC_PUT(sc, SNR_FAET, -1);
NIC_PUT(sc, SNR_MPT, -1);
initialise_tda(sc);
initialise_rda(sc);
initialise_rra(sc);
initialise_tba(sc);
/* enable the chip */
NIC_PUT(sc, SNR_CR, 0);
wbflush();
/* program the CAM */
camprogram(sc);
/* get it to read resource descriptors */
NIC_PUT(sc, SNR_CR, CR_RRRA);
wbflush();
while ((NIC_GET(sc, SNR_CR)) & CR_RRRA)
continue;
/* enable rx */
NIC_PUT(sc, SNR_CR, CR_RXEN);
wbflush();
/* flag interface as "running" */
sc->sc_if.if_flags |= IFF_RUNNING;
splx(s);
return (0);
}
/*
* close down an interface and free its buffers
* Called on final close of device, or if sninit() fails
* part way through.
*/
static int
snstop(sc)
struct sn_softc *sc;
{
struct mtd *mtd;
int s = splnet();
/* stick chip in reset */
NIC_PUT(sc, SNR_CR, CR_RST);
wbflush();
/* free all receive buffers (currently static so nothing to do) */
/* free all pending transmit mbufs */
while (sc->mtd_hw != sc->mtd_free) {
mtd = &sc->mtda[sc->mtd_hw];
mtd->mtd_buf = 0;
if (++sc->mtd_hw == NTDA) sc->mtd_hw = 0;
}
sc->txb_inuse = 0;
sc->sc_if.if_timer = 0;
sc->sc_if.if_flags &= ~(IFF_RUNNING | IFF_UP);
splx(s);
return (0);
}
/*
* Called if any Tx packets remain unsent after 5 seconds,
* In all cases we just reset the chip, and any retransmission
* will be handled by higher level protocol timeouts.
*/
static void
snwatchdog(ifp)
struct ifnet *ifp;
{
struct sn_softc *sc = ifp->if_softc;
struct mtd *mtd;
int temp;
if (sc->mtd_hw != sc->mtd_free) {
/* something still pending for transmit */
mtd = &sc->mtda[sc->mtd_hw];
if (SRO(sc->bitmode, mtd->mtd_txp, TXP_STATUS) == 0)
log(LOG_ERR, "%s: Tx - timeout\n",
sc->sc_dev.dv_xname);
else
log(LOG_ERR, "%s: Tx - lost interrupt\n",
sc->sc_dev.dv_xname);
temp = ifp->if_flags & IFF_UP;
snreset(sc);
ifp->if_flags |= temp;
}
}
/*
* stuff packet into sonic (at splnet)
*/
static __inline__ int
sonicput(sc, m0)
struct sn_softc *sc;
struct mbuf *m0;
{
struct mtd *mtdp;
struct mbuf *m;
u_char *buff, *buffer;
void *txp;
u_int len = 0;
u_int totlen = 0;
int mtd_free = sc->mtd_free;
int mtd_next;
int txb_new = sc->txb_new;
if (NIC_GET(sc, SNR_CR) & CR_TXP)
return (0);
/* grab the replacement mtd */
mtdp = &sc->mtda[mtd_free];
if ((mtd_next = mtd_free + 1) == NTDA)
mtd_next = 0;
if (mtd_next == sc->mtd_hw)
return (0);
/* We are guaranteed, if we get here, that the xmit buffer is free. */
buff = buffer = sc->tbuf[txb_new];
/* this packet goes to mtdnext fill in the TDA */
mtdp->mtd_buf = buffer;
txp = mtdp->mtd_txp;
SWO(sc->bitmode, txp, TXP_CONFIG, 0);
for (m = m0; m; m = m->m_next) {
u_char *data = mtod(m, u_char *);
len = m->m_len;
totlen += len;
bcopy(data, buff, len);
buff += len;
}
if (totlen >= TXBSIZE) {
panic("%s: sonicput: packet overflow", sc->sc_dev.dv_xname);
}
SWO(sc->bitmode, txp, TXP_FRAGOFF + (0 * TXP_FRAGSIZE) + TXP_FPTRLO,
LOWER(sc->vtbuf[txb_new]));
SWO(sc->bitmode, txp, TXP_FRAGOFF + (0 * TXP_FRAGSIZE) + TXP_FPTRHI,
UPPER(sc->vtbuf[txb_new]));
if (totlen < ETHERMIN + sizeof(struct ether_header)) {
int pad = ETHERMIN + sizeof(struct ether_header) - totlen;
bzero(buffer + totlen, pad);
totlen = ETHERMIN + sizeof(struct ether_header);
}
SWO(sc->bitmode, txp, TXP_FRAGOFF + (0 * TXP_FRAGSIZE) + TXP_FSIZE,
totlen);
SWO(sc->bitmode, txp, TXP_FRAGCNT, 1);
SWO(sc->bitmode, txp, TXP_PKTSIZE, totlen);
/* link onto the next mtd that will be used */
SWO(sc->bitmode, txp, TXP_FRAGOFF + (1 * TXP_FRAGSIZE) + TXP_FPTRLO,
LOWER(sc->mtda[mtd_next].mtd_vtxp) | EOL);
/*
* The previous txp.tlink currently contains a pointer to
* our txp | EOL. Want to clear the EOL, so write our
* pointer to the previous txp.
*/
SWO(sc->bitmode, sc->mtda[sc->mtd_prev].mtd_txp, sc->mtd_tlinko,
LOWER(mtdp->mtd_vtxp));
sc->mtd_prev = mtd_free;
sc->mtd_free = mtd_next;
/* make sure chip is running */
wbflush();
NIC_PUT(sc, SNR_CR, CR_TXP);
wbflush();
sc->sc_if.if_timer = 5; /* 5 seconds to watch for failing to transmit */
return (totlen);
}
/*
* These are called from sonicioctl() when /etc/ifconfig is run to set
* the address or switch the i/f on.
*/
/*
* CAM support
*/
static void
caminitialise(sc)
struct sn_softc *sc;
{
void *p_cda = sc->p_cda;
int i;
int bitmode = sc->bitmode;
int camoffset;
for (i = 0; i < MAXCAM; i++) {
camoffset = i * CDA_CAMDESC;
SWO(bitmode, p_cda, (camoffset + CDA_CAMEP), i);
SWO(bitmode, p_cda, (camoffset + CDA_CAMAP2), 0);
SWO(bitmode, p_cda, (camoffset + CDA_CAMAP1), 0);
SWO(bitmode, p_cda, (camoffset + CDA_CAMAP0), 0);
}
SWO(bitmode, p_cda, CDA_ENABLE, 0);
}
static void
camentry(sc, entry, ea)
int entry;
u_char *ea;
struct sn_softc *sc;
{
void *p_cda = sc->p_cda;
int bitmode = sc->bitmode;
int camoffset = entry * CDA_CAMDESC;
SWO(bitmode, p_cda, camoffset + CDA_CAMEP, entry);
SWO(bitmode, p_cda, camoffset + CDA_CAMAP2, (ea[5] << 8) | ea[4]);
SWO(bitmode, p_cda, camoffset + CDA_CAMAP1, (ea[3] << 8) | ea[2]);
SWO(bitmode, p_cda, camoffset + CDA_CAMAP0, (ea[1] << 8) | ea[0]);
SWO(bitmode, p_cda, CDA_ENABLE,
(SRO(bitmode, p_cda, CDA_ENABLE) | (1 << entry)));
}
static void
camprogram(sc)
struct sn_softc *sc;
{
struct ether_multistep step;
struct ether_multi *enm;
struct ifnet *ifp;
int timeout;
int mcount = 0;
caminitialise(sc);
ifp = &sc->sc_if;
/* Always load our own address first. */
camentry (sc, mcount, LLADDR(ifp->if_sadl));
mcount++;
/* Assume we won't need allmulti bit. */
ifp->if_flags &= ~IFF_ALLMULTI;
/* Loop through multicast addresses */
ETHER_FIRST_MULTI(step, &sc->sc_ethercom, enm);
while (enm != NULL) {
if (mcount == MAXCAM) {
ifp->if_flags |= IFF_ALLMULTI;
break;
}
if (bcmp(enm->enm_addrlo, enm->enm_addrhi,
sizeof(enm->enm_addrlo)) != 0) {
/*
* SONIC's CAM is programmed with specific
* addresses. It has no way to specify a range.
* (Well, thats not exactly true. If the
* range is small one could program each addr
* within the range as a seperate CAM entry)
*/
ifp->if_flags |= IFF_ALLMULTI;
break;
}
/* program the CAM with the specified entry */
camentry(sc, mcount, enm->enm_addrlo);
mcount++;
ETHER_NEXT_MULTI(step, enm);
}
NIC_PUT(sc, SNR_CDP, LOWER(sc->v_cda));
NIC_PUT(sc, SNR_CDC, MAXCAM);
NIC_PUT(sc, SNR_CR, CR_LCAM);
wbflush();
timeout = 10000;
while ((NIC_GET(sc, SNR_CR) & CR_LCAM) && timeout--)
continue;
if (timeout == 0) {
/* XXX */
panic("%s: CAM initialisation failed\n", sc->sc_dev.dv_xname);
}
timeout = 10000;
while (((NIC_GET(sc, SNR_ISR) & ISR_LCD) == 0) && timeout--)
continue;
if (NIC_GET(sc, SNR_ISR) & ISR_LCD)
NIC_PUT(sc, SNR_ISR, ISR_LCD);
else
printf("%s: CAM initialisation without interrupt\n",
sc->sc_dev.dv_xname);
}
#ifdef DEBUG
static void
camdump(sc)
struct sn_softc *sc;
{
int i;
printf("CAM entries:\n");
NIC_PUT(sc, SNR_CR, CR_RST);
wbflush();
for (i = 0; i < 16; i++) {
ushort ap2, ap1, ap0;
NIC_PUT(sc, SNR_CEP, i);
wbflush();
ap2 = NIC_GET(sc, SNR_CAP2);
ap1 = NIC_GET(sc, SNR_CAP1);
ap0 = NIC_GET(sc, SNR_CAP0);
printf("%d: ap2=0x%x ap1=0x%x ap0=0x%x\n", i, ap2, ap1, ap0);
}
printf("CAM enable 0x%lx\n", NIC_GET(sc, SNR_CEP));
NIC_PUT(sc, SNR_CR, 0);
wbflush();
}
#endif
static void
initialise_tda(sc)
struct sn_softc *sc;
{
struct mtd *mtd;
int i;
for (i = 0; i < NTDA; i++) {
mtd = &sc->mtda[i];
mtd->mtd_buf = 0;
}
sc->mtd_hw = 0;
sc->mtd_prev = NTDA - 1;
sc->mtd_free = 0;
sc->mtd_tlinko = TXP_FRAGOFF + 1*TXP_FRAGSIZE + TXP_FPTRLO;
NIC_PUT(sc, SNR_UTDA, UPPER(sc->mtda[0].mtd_vtxp));
NIC_PUT(sc, SNR_CTDA, LOWER(sc->mtda[0].mtd_vtxp));
}
static void
initialise_rda(sc)
struct sn_softc *sc;
{
int bitmode = sc->bitmode;
int i;
/* link the RDA's together into a circular list */
for (i = 0; i < (NRDA - 1); i++) {
SWO(bitmode, sc->p_rda[i], RXPKT_RLINK, LOWER(sc->v_rda[i+1]));
SWO(bitmode, sc->p_rda[i], RXPKT_INUSE, 1);
}
SWO(bitmode, sc->p_rda[NRDA - 1], RXPKT_RLINK,
LOWER(sc->v_rda[0]) | EOL);
SWO(bitmode, sc->p_rda[NRDA - 1], RXPKT_INUSE, 1);
/* mark end of receive descriptor list */
sc->sc_rdamark = NRDA - 1;
sc->sc_rxmark = 0;
NIC_PUT(sc, SNR_URDA, UPPER(sc->v_rda[0]));
NIC_PUT(sc, SNR_CRDA, LOWER(sc->v_rda[0]));
wbflush();
}
static void
initialise_rra(sc)
struct sn_softc *sc;
{
int i;
u_int v;
int bitmode = sc->bitmode;
if (bitmode)
NIC_PUT(sc, SNR_EOBC, RBASIZE(sc) / 2 - 2);
else
NIC_PUT(sc, SNR_EOBC, RBASIZE(sc) / 2 - 1);
NIC_PUT(sc, SNR_URRA, UPPER(sc->v_rra[0]));
NIC_PUT(sc, SNR_RSA, LOWER(sc->v_rra[0]));
/* rea must point just past the end of the rra space */
NIC_PUT(sc, SNR_REA, LOWER(sc->v_rea));
NIC_PUT(sc, SNR_RRP, LOWER(sc->v_rra[0]));
NIC_PUT(sc, SNR_RSC, 0);
/* fill up SOME of the rra with buffers */
for (i = 0; i < NRBA; i++) {
v = kvtop(sc->rbuf[i]);
SWO(bitmode, sc->p_rra[i], RXRSRC_PTRHI, UPPER(v));
SWO(bitmode, sc->p_rra[i], RXRSRC_PTRLO, LOWER(v));
SWO(bitmode, sc->p_rra[i], RXRSRC_WCHI, UPPER(NBPG/2));
SWO(bitmode, sc->p_rra[i], RXRSRC_WCLO, LOWER(NBPG/2));
}
sc->sc_rramark = NRBA;
NIC_PUT(sc, SNR_RWP, LOWER(sc->v_rra[sc->sc_rramark]));
wbflush();
}
static void
initialise_tba(sc)
struct sn_softc *sc;
{
sc->txb_cnt = NTXB;
sc->txb_inuse = 0;
sc->txb_new = 0;
}
void
snintr(arg, slot)
void *arg;
int slot;
{
struct sn_softc *sc = (struct sn_softc *)arg;
int isr;
while ((isr = (NIC_GET(sc, SNR_ISR) & ISR_ALL)) != 0) {
/* scrub the interrupts that we are going to service */
NIC_PUT(sc, SNR_ISR, isr);
wbflush();
if (isr & (ISR_BR | ISR_LCD | ISR_TC))
printf("%s: unexpected interrupt status 0x%x\n",
sc->sc_dev.dv_xname, isr);
if (isr & (ISR_TXDN | ISR_TXER | ISR_PINT))
sonictxint(sc);
if (isr & ISR_PKTRX)
sonicrxint(sc);
if (isr & (ISR_HBL | ISR_RDE | ISR_RBE | ISR_RBAE | ISR_RFO)) {
if (isr & ISR_HBL)
/*
* The repeater is not providing a heartbeat.
* In itself this isn't harmful, lots of the
* cheap repeater hubs don't supply a heartbeat.
* So ignore the lack of heartbeat. Its only
* if we can't detect a carrier that we have a
* problem.
*/
;
if (isr & ISR_RDE)
printf("%s: receive descriptors exhausted\n",
sc->sc_dev.dv_xname);
if (isr & ISR_RBE)
printf("%s: receive buffers exhausted\n",
sc->sc_dev.dv_xname);
if (isr & ISR_RBAE)
printf("%s: receive buffer area exhausted\n",
sc->sc_dev.dv_xname);
if (isr & ISR_RFO)
printf("%s: receive FIFO overrun\n",
sc->sc_dev.dv_xname);
}
if (isr & (ISR_CRC | ISR_FAE | ISR_MP)) {
#ifdef notdef
if (isr & ISR_CRC)
sc->sc_crctally++;
if (isr & ISR_FAE)
sc->sc_faetally++;
if (isr & ISR_MP)
sc->sc_mptally++;
#endif
}
snstart(&sc->sc_if);
}
return;
}
/*
* Transmit interrupt routine
*/
static void
sonictxint(sc)
struct sn_softc *sc;
{
struct mtd *mtd;
void *txp;
/* XXX DG make mtd_hw a local var */
if (sc->mtd_hw == sc->mtd_free)
return;
while (sc->mtd_hw != sc->mtd_free) {
mtd = &sc->mtda[sc->mtd_hw];
if (mtd->mtd_buf == 0)
break;
txp = mtd->mtd_txp;
if (SRO(sc->bitmode, txp, TXP_STATUS) == 0)
return; /* it hasn't really gone yet */
if (sndebug) {
struct ether_header *eh;
eh = (struct ether_header *) mtd->mtd_buf;
printf("%s: xmit status=0x%x len=%d type=0x%x from %s",
sc->sc_dev.dv_xname,
SRO(sc->bitmode, txp, TXP_STATUS),
SRO(sc->bitmode, txp, TXP_PKTSIZE),
htons(eh->ether_type),
ether_sprintf(eh->ether_shost));
printf(" (to %s)\n", ether_sprintf(eh->ether_dhost));
}
sc->txb_inuse--;
mtd->mtd_buf = 0;
if (++sc->mtd_hw == NTDA) sc->mtd_hw = 0;
/* XXX - Do stats here. */
if ((SRO(sc->bitmode, txp, TXP_STATUS) & TCR_PTX) == 0) {
printf("%s: Tx packet status=0x%x\n",
sc->sc_dev.dv_xname,
SRO(sc->bitmode, txp, TXP_STATUS));
/* XXX - DG This looks bogus */
if (sc->mtd_hw != sc->mtd_free) {
printf("resubmitting remaining packets\n");
mtd = &sc->mtda[sc->mtd_hw];
NIC_PUT(sc, SNR_CTDA, LOWER(mtd->mtd_vtxp));
NIC_PUT(sc, SNR_CR, CR_TXP);
wbflush();
return;
}
}
}
}
/*
* Receive interrupt routine
*/
static void
sonicrxint(sc)
struct sn_softc *sc;
{
void *rda;
int orra;
int len;
int rramark;
int rdamark;
int bitmode = sc->bitmode;
u_int16_t rxpkt_ptr;
rda = sc->p_rda[sc->sc_rxmark];
while (SRO(bitmode, rda, RXPKT_INUSE) == 0) {
u_int status = SRO(bitmode, rda, RXPKT_STATUS);
orra = RBASEQ(SRO(bitmode, rda, RXPKT_SEQNO)) & RRAMASK;
rxpkt_ptr = SRO(bitmode, rda, RXPKT_PTRLO);
len = SRO(bitmode, rda, RXPKT_BYTEC) -
sizeof(struct ether_header) - FCSSIZE;
if (status & RCR_PRX) {
caddr_t pkt =
sc->rbuf[orra & RBAMASK] + (rxpkt_ptr & PGOFSET);
if (sonic_read(sc, pkt, len)) {
sc->sc_if.if_ipackets++;
sc->sc_sum.ls_ipacks++;
sc->sc_missed = 0;
}
} else
sc->sc_if.if_ierrors++;
/*
* give receive buffer area back to chip.
*
* If this was the last packet in the RRA, give the RRA to
* the chip again.
* If sonic read didnt copy it out then we would have to
* wait !!
* (dont bother add it back in again straight away)
*
* Really, we're doing p_rra[rramark] = p_rra[orra] but
* we have to use the macros because SONIC might be in
* 16 or 32 bit mode.
*/
if (status & RCR_LPKT) {
void *tmp1, *tmp2;
rramark = sc->sc_rramark;
tmp1 = sc->p_rra[rramark];
tmp2 = sc->p_rra[orra];
SWO(bitmode, tmp1, RXRSRC_PTRLO,
SRO(bitmode, tmp2, RXRSRC_PTRLO));
SWO(bitmode, tmp1, RXRSRC_PTRHI,
SRO(bitmode, tmp2, RXRSRC_PTRHI));
SWO(bitmode, tmp1, RXRSRC_WCLO,
SRO(bitmode, tmp2, RXRSRC_WCLO));
SWO(bitmode, tmp1, RXRSRC_WCHI,
SRO(bitmode, tmp2, RXRSRC_WCHI));
/* zap old rra for fun */
SWO(bitmode, tmp2, RXRSRC_WCHI, 0);
SWO(bitmode, tmp2, RXRSRC_WCLO, 0);
sc->sc_rramark = (++rramark) & RRAMASK;
NIC_PUT(sc, SNR_RWP, LOWER(sc->v_rra[rramark]));
wbflush();
}
/*
* give receive descriptor back to chip simple
* list is circular
*/
rdamark = sc->sc_rdamark;
SWO(bitmode, rda, RXPKT_INUSE, 1);
SWO(bitmode, rda, RXPKT_RLINK,
SRO(bitmode, rda, RXPKT_RLINK) | EOL);
SWO(bitmode, sc->p_rda[rdamark], RXPKT_RLINK,
SRO(bitmode, sc->p_rda[rdamark], RXPKT_RLINK) & ~EOL);
sc->sc_rdamark = sc->sc_rxmark;
if (++sc->sc_rxmark >= NRDA)
sc->sc_rxmark = 0;
rda = sc->p_rda[sc->sc_rxmark];
}
}
/*
* sonic_read -- pull packet off interface and forward to
* appropriate protocol handler
*/
static __inline__ int
sonic_read(sc, pkt, len)
struct sn_softc *sc;
caddr_t pkt;
int len;
{
struct ifnet *ifp = &sc->sc_if;
struct ether_header *et;
struct mbuf *m;
/*
* Get pointer to ethernet header (in input buffer).
*/
et = (struct ether_header *)pkt;
if (sndebug) {
printf("%s: rcvd 0x%p len=%d type=0x%x from %s",
sc->sc_dev.dv_xname, et, len, htons(et->ether_type),
ether_sprintf(et->ether_shost));
printf(" (to %s)\n", ether_sprintf(et->ether_dhost));
}
if (len < ETHERMIN || len > ETHERMTU) {
printf("%s: invalid packet length %d bytes\n",
sc->sc_dev.dv_xname, len);
return (0);
}
#if NBPFILTER > 0
/*
* Check if there's a bpf filter listening on this interface.
* If so, hand off the raw packet to enet, then discard things
* not destined for us (but be sure to keep broadcast/multicast).
*/
if (ifp->if_bpf) {
bpf_tap(ifp->if_bpf, pkt,
len + sizeof(struct ether_header));
if ((ifp->if_flags & IFF_PROMISC) != 0 &&
(et->ether_dhost[0] & 1) == 0 && /* !mcast and !bcast */
bcmp(et->ether_dhost, LLADDR(ifp->if_sadl),
sizeof(et->ether_dhost)) != 0)
return (0);
}
#endif
m = sonic_get(sc, et, len);
if (m == NULL)
return (0);
ether_input(ifp, et, m);
return (1);
}
#define sonicdataaddr(eh, off, type) ((type)(((caddr_t)((eh) + 1) + (off))))
/*
* munge the received packet into an mbuf chain
* because we are using stupid buffer management this
* is slow.
*/
static __inline__ struct mbuf *
sonic_get(sc, eh, datalen)
struct sn_softc *sc;
struct ether_header *eh;
int datalen;
{
struct mbuf *m;
struct mbuf *top = 0, **mp = &top;
int len;
char *spkt = sonicdataaddr(eh, 0, caddr_t);
char *epkt = spkt + datalen;
char *cp = spkt;
epkt = cp + datalen;
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == 0)
return (0);
m->m_pkthdr.rcvif = &sc->sc_if;
m->m_pkthdr.len = datalen;
m->m_len = MHLEN;
while (datalen > 0) {
if (top) {
MGET(m, M_DONTWAIT, MT_DATA);
if (m == 0) {
m_freem(top);
return (0);
}
m->m_len = MLEN;
}
len = min(datalen, 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;
datalen -= len;
if (cp == epkt)
cp = spkt;
}
return (top);
}
static u_char bbr4[] = {0,8,4,12,2,10,6,14,1,9,5,13,3,11,7,15};
#define bbr(v) ((bbr4[(v)&0xf] << 4) | bbr4[((v)>>4) & 0xf])
void
sn_get_enaddr(t, h, o, dst)
bus_space_tag_t t;
bus_space_handle_t h;
vm_offset_t o;
u_char *dst;
{
int i, do_bbr;
u_char b;
/*
* For reasons known only to Apple, MAC addresses in the ethernet
* PROM are stored in Token Ring (IEEE 802.5) format, that is
* with all of the bits in each byte reversed (canonical bit format).
* When the address is read out it must be reversed to ethernet format
* before use.
*
* Apple has been assigned OUI's 08:00:07 and 00:a0:40. All onboard
* ethernet addresses on 68K machines should be in one of these
* two ranges.
*
* Here is where it gets complicated.
*
* The PMac 7200, 7500, 8500, and 9500 accidentally had the PROM
* written in standard ethernet format. The MacOS accounted for this
* in these systems, and did not reverse the bytes. Some other
* networking utilities were not so forgiving, and got confused.
* "Some" of Apple's Nubus ethernet cards also had their bits
* burned in ethernet format.
*
* Apple petitioned the IEEE and was granted the 00:05:02 (bit reversal
* of 00:a0:40) as well. As of OpenTransport 1.1.1, Apple removed
* their workaround and now reverses the bits regardless of
* what kind of machine it is. So PMac systems and the affected
* Nubus cards now use 00:05:02, instead of the 00:a0:40 for which they
* were intended.
*
* See Apple Techinfo article TECHINFO-0020552, "OpenTransport 1.1.1
* and MacOS System 7.5.3 FAQ (10/96)" for more details.
*/
do_bbr = 0;
b = bus_space_read_1(t, h, o);
if (b == 0x10)
do_bbr = 1;
dst[0] = (do_bbr) ? bbr(b) : b;
for (i = 1 ; i < ETHER_ADDR_LEN ; i++) {
b = bus_space_read_1(t, h, o+i);
dst[i] = (do_bbr) ? bbr(b) : b;
}
}
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