* National Semiconductor DP8393X SONIC Driver

/* $NetBSD: if_sn.c,v 1.56 2024/07/05 04:31:49 rin Exp $ */

/*
* National Semiconductor DP8393X 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 <[email protected]>
* and also
* Yanagisawa Takeshi <[email protected]>
* did the work to get this running on the Macintosh.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_sn.c,v 1.56 2024/07/05 04:31:49 rin Exp $");

#include "opt_inet.h"

#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>
#include <net/bpf.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 <uvm/uvm_extern.h>

#include <machine/cpu.h>
#include <newsmips/apbus/apbusvar.h>
#include <newsmips/apbus/if_snreg.h>
#include <newsmips/apbus/if_snvar.h>

/* #define SNDEBUG */

#ifdef SNDEBUG
# define DPRINTF printf
#else
# define DPRINTF while (0) printf
#endif

static void snwatchdog(struct ifnet *);
static int sninit(struct sn_softc *sc);
static int snstop(struct sn_softc *sc);
static int snioctl(struct ifnet *ifp, u_long cmd, void *data);
static void snstart(struct ifnet *ifp);
static void snreset(struct sn_softc *sc);

static void caminitialise(struct sn_softc *);
static void camentry(struct sn_softc *, int, const u_char *ea);
static void camprogram(struct sn_softc *);
static void initialise_tda(struct sn_softc *);
static void initialise_rda(struct sn_softc *);
static void initialise_rra(struct sn_softc *);
#ifdef SNDEBUG
static void camdump(struct sn_softc *sc);
#endif

static void sonictxint(struct sn_softc *);
static void sonicrxint(struct sn_softc *);

static inline u_int sonicput(struct sn_softc *sc, struct mbuf *m0,
int mtd_next);
static inline int sonic_read(struct sn_softc *, void *, int);
static inline struct mbuf *sonic_get(struct sn_softc *, void *, int);

/*
* SONIC buffers need to be aligned 16 or 32 bit aligned.
* These macros calculate and verify alignment.
*/
#define SOALIGN(m, array) (m ? (roundup((int)array, 4)) : \
(roundup((int)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(struct sn_softc *sc, uint8_t *lladdr)
{
struct ifnet *ifp = &sc->sc_if;
uint8_t *p;
uint8_t *pp;
int i;

if (sc->memory == NULL) {
aprint_error_dev(sc->sc_dev,
"memory allocation for descriptors failed\n");
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->memory;
pp = (uint8_t *)roundup((int)p, PAGE_SIZE);
p = pp;

for (i = 0; i < NRRA; i++) {
sc->p_rra[i] = (void *)p;
sc->v_rra[i] = SONIC_GETDMA(sc, p);
p += RXRSRC_SIZE(sc);
}
sc->v_rea = SONIC_GETDMA(sc, p);

p = (uint8_t *)SOALIGN(sc, p);

sc->p_cda = (void *)(p);
sc->v_cda = SONIC_GETDMA(sc, p);
p += CDA_SIZE(sc);

p = (uint8_t *)SOALIGN(sc, p);

for (i = 0; i < NTDA; i++) {
struct mtd *mtdp = &sc->mtda[i];
mtdp->mtd_txp = (void *)p;
mtdp->mtd_vtxp = SONIC_GETDMA(sc, p);
p += TXP_SIZE(sc);
}

p = (uint8_t *)SOALIGN(sc, p);

if ((p - pp) > PAGE_SIZE) {
aprint_error_dev(sc->sc_dev, "sizeof RRA (%ld) + CDA (%ld) +"
"TDA (%ld) > PAGE_SIZE (%d). Punt!\n",
(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,
PAGE_SIZE);
return 1;
}

p = pp + PAGE_SIZE;
pp = p;

sc->sc_nrda = PAGE_SIZE / RXPKT_SIZE(sc);
sc->p_rda = (void *)p;
sc->v_rda = SONIC_GETDMA(sc, p);

p = pp + PAGE_SIZE;

for (i = 0; i < NRBA; i++) {
sc->rbuf[i] = SONIC_BUFFER(sc, p);
p += PAGE_SIZE;
}

pp = p;
for (i = 0; i < NTDA; i++) {
struct mtd *mtdp = &sc->mtda[i];

mtdp->mtd_buf = SONIC_BUFFER(sc, p);
mtdp->mtd_vbuf = SONIC_GETDMA(sc, p);
p += TXBSIZE;
}

#ifdef SNDEBUG
camdump(sc);
#endif
aprint_normal_dev(sc->sc_dev, "Ethernet address %s\n",
ether_sprintf(lladdr));

#ifdef SNDEBUG
aprint_debug_dev(sc->sc_dev, "buffers: rra=%p cda=%p rda=%p tda=%p\n",
sc->p_rra[0], sc->p_cda,
sc->p_rda, sc->mtda[0].mtd_txp);
#endif

strcpy(ifp->if_xname, device_xname(sc->sc_dev));
ifp->if_softc = sc;
ifp->if_ioctl = snioctl;
ifp->if_start = snstart;
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_watchdog = snwatchdog;
if_attach(ifp);
if_deferred_start_init(ifp, NULL);
ether_ifattach(ifp, lladdr);

return 0;
}

static int
snioctl(struct ifnet *ifp, u_long cmd, void *data)
{
struct ifaddr *ifa;
struct sn_softc *sc = ifp->if_softc;
int s = splnet(), err = 0;
u_short temp;

switch (cmd) {

case SIOCINITIFADDR:
ifa = (struct ifaddr *)data;
ifp->if_flags |= IFF_UP;
(void)sninit(sc);
switch (ifa->ifa_addr->sa_family) {
#ifdef INET
case AF_INET:
arp_ifinit(ifp, ifa);
break;
#endif
default:
break;
}
break;

case SIOCSIFFLAGS:
if ((err = ifioctl_common(ifp, cmd, data)) != 0)
break;
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.
*/
snstop(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.
*/
(void)sninit(sc);
} else {
/*
* reset the interface to pick up any other changes
* in flags
*/
temp = ifp->if_flags & IFF_UP;
snreset(sc);
ifp->if_flags |= temp;
snstart(ifp);
}
break;

case SIOCADDMULTI:
case SIOCDELMULTI:
if ((err = ether_ioctl(ifp, cmd, data)) == ENETRESET) {
/*
* Multicast list has changed; set the hardware
* filter accordingly. But remember UP flag!
*/
if (ifp->if_flags & IFF_RUNNING) {
temp = ifp->if_flags & IFF_UP;
snreset(sc);
ifp->if_flags |= temp;
}
err = 0;
}
break;
default:
err = ether_ioctl(ifp, cmd, data);
break;
}
splx(s);
return err;
}

/*
* Encapsulate a packet of type family for the local net.
*/
static void
snstart(struct ifnet *ifp)
{
struct sn_softc *sc = ifp->if_softc;
struct mbuf *m;
int mtd_next;

if ((ifp->if_flags & IFF_RUNNING) == 0)
return;

outloop:
/* Check for room in the xmit buffer. */
if ((mtd_next = (sc->mtd_free + 1)) == NTDA)
mtd_next = 0;

if (mtd_next == sc->mtd_hw) {
return;
}

IF_POLL(&ifp->if_snd, m);
if (m == 0)
return;

/* We need the header for m_pkthdr.len. */
KASSERT(m->m_flags & M_PKTHDR);

/*
* If bpf is listening on this interface, let it
* see the packet before we commit it to the wire.
*/
bpf_mtap(ifp, m, BPF_D_OUT);

/*
* If there is nothing in the o/p queue, and there is room in
* the Tx ring, then send the packet directly. Otherwise it
* stays on the queue.
*/
if ((sonicput(sc, m, mtd_next)) == 0) {
return;
}
IF_DEQUEUE(&ifp->if_snd, m);

sc->mtd_prev = sc->mtd_free;
sc->mtd_free = mtd_next;

if_statinc(ifp, if_opackets); /* # 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(struct sn_softc *sc)
{

snstop(sc);
sninit(sc);
}

static int
sninit(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 accessible in reset mode! */

/* config it */
NIC_PUT(sc, SNR_DCR, (sc->snr_dcr |
(sc->bitmode ? DCR_DW32 : DCR_DW16)));
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);

#if 0
NIC_PUT(sc, SNR_IMR, (IMR_PRXEN | IMR_PTXEN | IMR_TXEREN | IMR_LCDEN));
#else
NIC_PUT(sc, SNR_IMR, IMR_PRXEN | IMR_PTXEN | IMR_TXEREN | IMR_LCDEN |
IMR_BREN | IMR_HBLEN | IMR_RDEEN | IMR_RBEEN |
IMR_RBAEEN | IMR_RFOEN);
#endif

/* 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);

sn_md_init(sc); /* MD initialization */

/* 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(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];
m_freem(mtd->mtd_mbuf);
if (++sc->mtd_hw == NTDA) sc->mtd_hw = 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(struct ifnet *ifp)
{
struct sn_softc *sc = ifp->if_softc;
struct mtd *mtd;
u_short 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",
device_xname(sc->sc_dev));
else
log(LOG_ERR, "%s: Tx - lost interrupt\n",
device_xname(sc->sc_dev));
temp = ifp->if_flags & IFF_UP;
snreset(sc);
ifp->if_flags |= temp;
}
}

/*
* stuff packet into sonic (at splnet)
*/
static inline u_int
sonicput(struct sn_softc *sc, struct mbuf *m0, int mtd_next)
{
struct mtd *mtdp;
struct mbuf *m;
u_char *buff;
void *txp;
u_int len = 0;
u_int totlen = 0;

#ifdef whyonearthwouldyoudothis
if (NIC_GET(sc, SNR_CR) & CR_TXP)
return 0;
#endif

/* grab the replacement mtd */
mtdp = &sc->mtda[sc->mtd_free];

buff = mtdp->mtd_buf;

/* this packet goes to mtdnext fill in the TDA */
mtdp->mtd_mbuf = m0;
txp = mtdp->mtd_txp;

/* Write to the config word. Every (NTDA/2)+1 packets we set an intr */
if (sc->mtd_pint == 0) {
sc->mtd_pint = NTDA/2;
SWO(sc->bitmode, txp, TXP_CONFIG, TCR_PINT);
} else {
sc->mtd_pint--;
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;
memcpy(buff, data, len);
buff += len;
}
if (totlen >= TXBSIZE) {
panic("%s: sonicput: packet overflow",
device_xname(sc->sc_dev));
}

SWO(sc->bitmode, txp, TXP_FRAGOFF + (0 * TXP_FRAGSIZE) + TXP_FPTRLO,
LOWER(mtdp->mtd_vbuf));
SWO(sc->bitmode, txp, TXP_FRAGOFF + (0 * TXP_FRAGSIZE) + TXP_FPTRHI,
UPPER(mtdp->mtd_vbuf));

if (totlen < ETHERMIN + ETHER_HDR_LEN) {
int pad = ETHERMIN + ETHER_HDR_LEN - totlen;
memset((char *)mtdp->mtd_buf + totlen, 0, pad);
totlen = ETHERMIN + ETHER_HDR_LEN;
}

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));

/* 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(struct sn_softc *sc)
{
void *p_cda = sc->p_cda;
int i;
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(struct sn_softc *sc, int entry, const u_char *ea)
{
void *p_cda = sc->p_cda;
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(struct sn_softc *sc)
{
struct ethercom *ec = &sc->sc_ethercom;
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, CLLADDR(ifp->if_sadl));
mcount++;

/* Assume we won't need allmulti bit. */
ifp->if_flags &= ~IFF_ALLMULTI;

/* Loop through multicast addresses */
ETHER_LOCK(ec);
ETHER_FIRST_MULTI(step, ec, enm);
while (enm != NULL) {
if (mcount == MAXCAM) {
ifp->if_flags |= IFF_ALLMULTI;
break;
}

if (memcmp(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 separate 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);
}
ETHER_UNLOCK(ec);

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--)
delay(10);
if (timeout == 0) {
/* XXX */
panic("%s: CAM initialisation failed",
device_xname(sc->sc_dev));
}
timeout = 10000;
while (((NIC_GET(sc, SNR_ISR) & ISR_LCD) == 0) && timeout--)
delay(10);

if (NIC_GET(sc, SNR_ISR) & ISR_LCD)
NIC_PUT(sc, SNR_ISR, ISR_LCD);
else
printf("%s: CAM initialisation without interrupt\n",
device_xname(sc->sc_dev));
}

#ifdef SNDEBUG
static void
camdump(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%x\n", NIC_GET(sc, SNR_CEP));

NIC_PUT(sc, SNR_CR, 0);
wbflush();
}
#endif

static void
initialise_tda(struct sn_softc *sc)
{
struct mtd *mtd;
int i;

for (i = 0; i < NTDA; i++) {
mtd = &sc->mtda[i];
mtd->mtd_mbuf = 0;
}

sc->mtd_hw = 0;
sc->mtd_prev = NTDA - 1;
sc->mtd_free = 0;
sc->mtd_tlinko = TXP_FRAGOFF + 1*TXP_FRAGSIZE + TXP_FPTRLO;
sc->mtd_pint = NTDA/2;

NIC_PUT(sc, SNR_UTDA, UPPER(sc->mtda[0].mtd_vtxp));
NIC_PUT(sc, SNR_CTDA, LOWER(sc->mtda[0].mtd_vtxp));
wbflush();
}

static void
initialise_rda(struct sn_softc *sc)
{
int i;
char *p_rda = 0;
uint32_t v_rda = 0;

/* link the RDA's together into a circular list */
for (i = 0; i < (sc->sc_nrda - 1); i++) {
p_rda = (char *)sc->p_rda + (i * RXPKT_SIZE(sc));
v_rda = sc->v_rda + ((i+1) * RXPKT_SIZE(sc));
SWO(bitmode, p_rda, RXPKT_RLINK, LOWER(v_rda));
SWO(bitmode, p_rda, RXPKT_INUSE, 1);
}
p_rda = (char *)sc->p_rda + ((sc->sc_nrda - 1) * RXPKT_SIZE(sc));
SWO(bitmode, p_rda, RXPKT_RLINK, LOWER(sc->v_rda) | EOL);
SWO(bitmode, p_rda, RXPKT_INUSE, 1);

/* mark end of receive descriptor list */
sc->sc_rdamark = sc->sc_nrda - 1;

sc->sc_rxmark = 0;

NIC_PUT(sc, SNR_URDA, UPPER(sc->v_rda));
NIC_PUT(sc, SNR_CRDA, LOWER(sc->v_rda));
wbflush();
}

static void
initialise_rra(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 = SONIC_GETDMA(sc, 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(PAGE_SIZE/2));
SWO(bitmode, sc->p_rra[i], RXRSRC_WCLO, LOWER(PAGE_SIZE/2));
}
sc->sc_rramark = NRBA;
NIC_PUT(sc, SNR_RWP, LOWER(sc->v_rra[sc->sc_rramark]));
wbflush();
}

int
snintr(void *arg)
{
struct sn_softc *sc = (struct sn_softc *)arg;
int handled = 0;
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);
handled = 1;
wbflush();

if (isr & (ISR_BR | ISR_LCD | ISR_TC))
printf("%s: unexpected interrupt status 0x%x\n",
device_xname(sc->sc_dev), 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",
device_xname(sc->sc_dev));
if (isr & ISR_RBE)
printf("%s: receive buffers exhausted\n",
device_xname(sc->sc_dev));
if (isr & ISR_RBAE)
printf("%s: receive buffer area exhausted\n",
device_xname(sc->sc_dev));
if (isr & ISR_RFO)
printf("%s: receive FIFO overrun\n",
device_xname(sc->sc_dev));
}
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
}
if_schedule_deferred_start(&sc->sc_if);
}
return handled;
}

/*
* Transmit interrupt routine
*/
static void
sonictxint(struct sn_softc *sc)
{
struct mtd *mtd;
void *txp;
unsigned short txp_status;
int mtd_hw;
struct ifnet *ifp = &sc->sc_if;

mtd_hw = sc->mtd_hw;

if (mtd_hw == sc->mtd_free)
return;

while (mtd_hw != sc->mtd_free) {
mtd = &sc->mtda[mtd_hw];

txp = mtd->mtd_txp;

if (SRO(sc->bitmode, txp, TXP_STATUS) == 0) {
break; /* it hasn't really gone yet */
}

#ifdef 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",
device_xname(sc->sc_dev),
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));
}
#endif /* SNDEBUG */

m_freem(mtd->mtd_mbuf);
mtd->mtd_mbuf = NULL;
if (++mtd_hw == NTDA) mtd_hw = 0;

txp_status = SRO(sc->bitmode, txp, TXP_STATUS);

if_statadd(ifp, if_collisions, (txp_status & TCR_EXC) ? 16 :
((txp_status & TCR_NC) >> 12));

if ((txp_status & TCR_PTX) == 0) {
if_statinc(ifp, if_oerrors);
printf("%s: Tx packet status=0x%x\n",
device_xname(sc->sc_dev), txp_status);

/* XXX - DG This looks bogus */
if (mtd_hw != sc->mtd_free) {
printf("resubmitting remaining packets\n");
mtd = &sc->mtda[mtd_hw];
NIC_PUT(sc, SNR_CTDA, LOWER(mtd->mtd_vtxp));
NIC_PUT(sc, SNR_CR, CR_TXP);
wbflush();
break;
}
}
}

sc->mtd_hw = mtd_hw;
return;
}

/*
* Receive interrupt routine
*/
static void
sonicrxint(struct sn_softc *sc)
{
void * rda;
int orra;
int len;
int rramark;
int rdamark;
uint16_t rxpkt_ptr;

rda = (char *)sc->p_rda + (sc->sc_rxmark * RXPKT_SIZE(sc));

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) - FCSSIZE;
if (status & RCR_PRX) {
void *pkt =
(char *)sc->rbuf[orra & RBAMASK] +
(rxpkt_ptr & PGOFSET);
if (sonic_read(sc, pkt, len) == 0)
if_statinc(&sc->sc_if, if_ierrors);
} else
if_statinc(&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, ((char *)sc->p_rda + (rdamark * RXPKT_SIZE(sc))),
RXPKT_RLINK,
SRO(bitmode, ((char *)sc->p_rda +
(rdamark * RXPKT_SIZE(sc))),
RXPKT_RLINK) & ~EOL);
sc->sc_rdamark = sc->sc_rxmark;

if (++sc->sc_rxmark >= sc->sc_nrda)
sc->sc_rxmark = 0;
rda = (char *)sc->p_rda + (sc->sc_rxmark * RXPKT_SIZE(sc));
}
}

/*
* sonic_read -- pull packet off interface and forward to
* appropriate protocol handler
*/
static inline int
sonic_read(struct sn_softc *sc, void *pkt, int len)
{
struct ifnet *ifp = &sc->sc_if;
struct mbuf *m;

if (len < (ETHER_MIN_LEN - ETHER_CRC_LEN) ||
len > (ETHER_MAX_LEN - ETHER_CRC_LEN)) {
printf("%s: invalid packet length %d bytes\n",
device_xname(sc->sc_dev), len);
return 0;
}

#ifdef SNDEBUG
{
struct ether_header eh_s, *eh = &eh_s;
memcpy(eh, pkt, sizeof(*eh));
CTASSERT(sizeof(*eh) <= ETHER_MIN_LEN);
printf("%s: rcvd %p len=%d type=0x%x from %s",
device_xname(sc->sc_dev), eh, len, htons(eh->ether_type),
ether_sprintf(eh->ether_shost));
printf(" (to %s)\n", ether_sprintf(eh->ether_dhost));
}
#endif /* SNDEBUG */

m = sonic_get(sc, pkt, len);
if (m == NULL)
return 0;
if_percpuq_enqueue(ifp->if_percpuq, m);
return 1;
}

/*
* munge the received packet into an mbuf chain
*/
static inline struct mbuf *
sonic_get(struct sn_softc *sc, void *pkt, int datalen)
{
struct mbuf *m, *top, **mp;
int len;

MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == 0)
return 0;
m_set_rcvif(m, &sc->sc_if);
m->m_pkthdr.len = datalen;
len = MHLEN;
top = 0;
mp = &top;

while (datalen > 0) {
if (top) {
MGET(m, M_DONTWAIT, MT_DATA);
if (m == 0) {
m_freem(top);
return 0;
}
len = MLEN;
}
if (datalen >= MINCLSIZE) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
if (top)
m_freem(top);
else
m_freem(m);
return 0;
}
len = MCLBYTES;
}

if (mp == &top) {
char *newdata = (char *)
ALIGN((char *)m->m_data +
sizeof(struct ether_header)) -
sizeof(struct ether_header);
len -= newdata - m->m_data;
m->m_data = newdata;
}

m->m_len = len = uimin(datalen, len);

memcpy(mtod(m, void *), pkt, (unsigned) len);
pkt = (char *)pkt + len;
datalen -= len;
*mp = m;
mp = &m->m_next;
}

return top;
}