* Copyright (c) 1994, 1995, 1997 Matt Thomas <matt@3am-software.com>

/* $NetBSD: lemac.c,v 1.56 2022/09/25 18:43:32 thorpej Exp $ */

/*-
* Copyright (c) 1994, 1995, 1997 Matt Thomas <[email protected]>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

/*
* DEC EtherWORKS 3 Ethernet Controllers
*
* Written by Matt Thomas
* BPF support code stolen directly from if_ec.c
*
* This driver supports the LEMAC DE203/204/205 cards.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: lemac.c,v 1.56 2022/09/25 18:43:32 thorpej Exp $");

#include "opt_inet.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/errno.h>
#include <sys/device.h>
#include <sys/rndsource.h>

#include <net/if.h>
#include <net/if_types.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <net/if_ether.h>
#include <net/if_media.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 <sys/bus.h>

#include <dev/ic/lemacreg.h>
#include <dev/ic/lemacvar.h>
#if 0
#include <i386/isa/decether.h>
#endif

static void lemac_init(lemac_softc_t *sc);
static void lemac_ifstart(struct ifnet *ifp);
static void lemac_reset(lemac_softc_t *sc);
static void lemac_rne_intr(lemac_softc_t *sc);
static void lemac_tne_intr(lemac_softc_t *sc);
static void lemac_txd_intr(lemac_softc_t *sc, unsigned cs_value);
static void lemac_rxd_intr(lemac_softc_t *sc, unsigned cs_value);
static int lemac_read_eeprom(lemac_softc_t *sc);
static void lemac_init_adapmem(lemac_softc_t *sc);

static const uint16_t lemac_allmulti_mctbl[LEMAC_MCTBL_SIZE/sizeof(uint16_t)] = {
0xFFFFU, 0xFFFFU, 0xFFFFU, 0xFFFFU,
0xFFFFU, 0xFFFFU, 0xFFFFU, 0xFFFFU,
0xFFFFU, 0xFFFFU, 0xFFFFU, 0xFFFFU,
0xFFFFU, 0xFFFFU, 0xFFFFU, 0xFFFFU,
0xFFFFU, 0xFFFFU, 0xFFFFU, 0xFFFFU,
0xFFFFU, 0xFFFFU, 0xFFFFU, 0xFFFFU,
0xFFFFU, 0xFFFFU, 0xFFFFU, 0xFFFFU,
0xFFFFU, 0xFFFFU, 0xFFFFU, 0xFFFFU,
};

/*
* Some tuning/monitoring variables.
*/
unsigned lemac_txmax = 16;

static void
lemac_rxd_intr(lemac_softc_t *sc, unsigned cs_value)
{
/*
* Handle CS_RXD (Receiver disabled) here.
*
* Check Free Memory Queue Count. If not equal to zero
* then just turn Receiver back on. If it is equal to
* zero then check to see if transmitter is disabled.
* Process transmit TXD loop once more. If all else
* fails then do software init (0xC0 to EEPROM Init)
* and rebuild Free Memory Queue.
*/

sc->sc_cntrs.cntr_rxd_intrs++;

/* Re-enable Receiver. */

cs_value &= ~LEMAC_CS_RXD;
LEMAC_OUTB(sc, LEMAC_REG_CS, cs_value);

if (LEMAC_INB(sc, LEMAC_REG_FMC) > 0)
return;

if (cs_value & LEMAC_CS_TXD)
lemac_txd_intr(sc, cs_value);

if ((LEMAC_INB(sc, LEMAC_REG_CS) & LEMAC_CS_RXD) == 0)
return;

printf("%s: fatal RXD error, attempting recovery\n",
sc->sc_if.if_xname);

lemac_reset(sc);
if (sc->sc_if.if_flags & IFF_UP) {
lemac_init(sc);
return;
}

/* Error during initialization. Mark card as disabled. */
printf("%s: recovery failed -- board disabled\n", sc->sc_if.if_xname);
}

static void
lemac_tne_intr(lemac_softc_t *sc)
{
unsigned txcount = LEMAC_INB(sc, LEMAC_REG_TDC);

sc->sc_cntrs.cntr_tne_intrs++;
while (txcount-- > 0) {
unsigned txsts = LEMAC_INB(sc, LEMAC_REG_TDQ);
if_statinc(&sc->sc_if, if_opackets); /* another one done */
if ((txsts & (LEMAC_TDQ_LCL | LEMAC_TDQ_NCL))
|| (txsts & LEMAC_TDQ_COL) == LEMAC_TDQ_EXCCOL) {
if (txsts & LEMAC_TDQ_NCL)
sc->sc_flags &= ~LEMAC_LINKUP;
if_statinc(&sc->sc_if, if_oerrors);
} else {
sc->sc_flags |= LEMAC_LINKUP;
if ((txsts & LEMAC_TDQ_COL) != LEMAC_TDQ_NOCOL)
if_statinc(&sc->sc_if, if_collisions);
}
}
sc->sc_if.if_flags &= ~IFF_OACTIVE;
if_schedule_deferred_start(&sc->sc_if);
}

static void
lemac_txd_intr(lemac_softc_t *sc, unsigned cs_value)
{
/*
* Read transmit status, remove transmit buffer from
* transmit queue and place on free memory queue,
* then reset transmitter.
* Increment appropriate counters.
*/

sc->sc_cntrs.cntr_txd_intrs++;
if (sc->sc_txctl & LEMAC_TX_STP) {
if_statinc(&sc->sc_if, if_oerrors);
/* return page to free queue */
LEMAC_OUTB(sc, LEMAC_REG_FMQ, LEMAC_INB(sc, LEMAC_REG_TDQ));
}

/* Turn back on transmitter if disabled */
LEMAC_OUTB(sc, LEMAC_REG_CS, cs_value & ~LEMAC_CS_TXD);
sc->sc_if.if_flags &= ~IFF_OACTIVE;
}

static int
lemac_read_eeprom(lemac_softc_t *sc)
{
int word_off, cksum;
u_char *ep;

cksum = 0;
ep = sc->sc_eeprom;
for (word_off = 0; word_off < LEMAC_EEP_SIZE / 2; word_off++) {
LEMAC_OUTB(sc, LEMAC_REG_PI1, word_off);
LEMAC_OUTB(sc, LEMAC_REG_IOP, LEMAC_IOP_EEREAD);

DELAY(LEMAC_EEP_DELAY);

*ep = LEMAC_INB(sc, LEMAC_REG_EE1); cksum += *ep++;
*ep = LEMAC_INB(sc, LEMAC_REG_EE2); cksum += *ep++;
}

/* Set up Transmit Control Byte for use later during transmit. */

sc->sc_txctl |= LEMAC_TX_FLAGS;

if ((sc->sc_eeprom[LEMAC_EEP_SWFLAGS] & LEMAC_EEP_SW_SQE) == 0)
sc->sc_txctl &= ~LEMAC_TX_SQE;

if (sc->sc_eeprom[LEMAC_EEP_SWFLAGS] & LEMAC_EEP_SW_LAB)
sc->sc_txctl |= LEMAC_TX_LAB;

memcpy(sc->sc_prodname, &sc->sc_eeprom[LEMAC_EEP_PRDNM],
LEMAC_EEP_PRDNMSZ);
sc->sc_prodname[LEMAC_EEP_PRDNMSZ] = '\0';

return cksum % 256;
}

static void
lemac_init_adapmem(lemac_softc_t *sc)
{
int pg, conf;

conf = LEMAC_INB(sc, LEMAC_REG_CNF);

if ((sc->sc_eeprom[LEMAC_EEP_SETUP] & LEMAC_EEP_ST_DRAM) == 0) {
sc->sc_lastpage = 63;
conf &= ~LEMAC_CNF_DRAM;
} else {
sc->sc_lastpage = 127;
conf |= LEMAC_CNF_DRAM;
}

LEMAC_OUTB(sc, LEMAC_REG_CNF, conf);

for (pg = 1; pg <= sc->sc_lastpage; pg++)
LEMAC_OUTB(sc, LEMAC_REG_FMQ, pg);
}

static void
lemac_input(lemac_softc_t *sc, bus_addr_t offset, size_t length)
{
struct ether_header eh;
struct mbuf *m;

if (length - sizeof(eh) > ETHERMTU || length - sizeof(eh) < ETHERMIN) {
if_statinc(&sc->sc_if, if_ierrors);
return;
}
if (LEMAC_USE_PIO_MODE(sc))
LEMAC_INSB(sc, LEMAC_REG_DAT, sizeof(eh), (void *)&eh);
else
LEMAC_GETBUF16(sc, offset, sizeof(eh) / 2, (void *)&eh);

MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL) {
if_statinc(&sc->sc_if, if_ierrors);
return;
}
if (length + 2 > MHLEN) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
m_free(m);
if_statinc(&sc->sc_if, if_ierrors);
return;
}
}
m->m_data += 2;
memcpy(m->m_data, (void *)&eh, sizeof(eh));
if (LEMAC_USE_PIO_MODE(sc)) {
LEMAC_INSB(sc, LEMAC_REG_DAT, length - sizeof(eh),
mtod(m, char *) + sizeof(eh));
} else {
LEMAC_GETBUF16(sc, offset + sizeof(eh),
(length - sizeof(eh)) / 2,
(void *)(mtod(m, char *) + sizeof(eh)));
if (length & 1)
m->m_data[length - 1]
= LEMAC_GET8(sc, offset + length - 1);
}

m->m_pkthdr.len = m->m_len = length;
m_set_rcvif(m, &sc->sc_if);

if_percpuq_enqueue((&sc->sc_if)->if_percpuq, m);
}

static void
lemac_rne_intr(lemac_softc_t *sc)
{
int rxcount;

sc->sc_cntrs.cntr_rne_intrs++;
rxcount = LEMAC_INB(sc, LEMAC_REG_RQC);
while (rxcount--) {
unsigned rxpg = LEMAC_INB(sc, LEMAC_REG_RQ);
uint32_t rxlen;

if (LEMAC_USE_PIO_MODE(sc)) {
LEMAC_OUTB(sc, LEMAC_REG_IOP, rxpg);
LEMAC_OUTB(sc, LEMAC_REG_PI1, 0);
LEMAC_OUTB(sc, LEMAC_REG_PI2, 0);
LEMAC_INSB(sc, LEMAC_REG_DAT, sizeof(rxlen),
(void *)&rxlen);
} else {
LEMAC_OUTB(sc, LEMAC_REG_MPN, rxpg);
rxlen = LEMAC_GET32(sc, 0);
}
if (rxlen & LEMAC_RX_OK) {
sc->sc_flags |= LEMAC_LINKUP;
/* Get receive length - subtract out checksum. */
rxlen = ((rxlen >> 8) & 0x7FF) - 4;
lemac_input(sc, sizeof(rxlen), rxlen);
} else {
if_statinc(&sc->sc_if, if_ierrors);
}
/* Return this page to Free Memory Queue */
LEMAC_OUTB(sc, LEMAC_REG_FMQ, rxpg);
} /* end while (recv_count--) */

return;
}

/*
* This is the standard method of reading the DEC Address ROMS.
* I don't understand it but it does work.
*/
static int
lemac_read_macaddr(unsigned char *hwaddr, const bus_space_tag_t iot,
const bus_space_handle_t ioh, const bus_addr_t ioreg, int skippat)
{
int cksum, rom_cksum;
unsigned char addrbuf[6];

if (!skippat) {
int idx, idx2, found, octet;
static u_char testpat[]
= { 0xFF, 0, 0x55, 0xAA, 0xFF, 0, 0x55, 0xAA };

idx2 = found = 0;

for (idx = 0; idx < 32; idx++) {
octet = bus_space_read_1(iot, ioh, ioreg);

if (octet == testpat[idx2]) {
if (++idx2 == sizeof(testpat)) {
++found;
break;
}
} else
idx2 = 0;
}

if (!found)
return -1;
}

if (hwaddr == NULL)
hwaddr = addrbuf;

cksum = 0;
hwaddr[0] = bus_space_read_1(iot, ioh, ioreg);
hwaddr[1] = bus_space_read_1(iot, ioh, ioreg);

/* hardware address can't be multicast */
if (hwaddr[0] & 1)
return -1;

cksum = *(u_short *)&hwaddr[0];

hwaddr[2] = bus_space_read_1(iot, ioh, ioreg);
hwaddr[3] = bus_space_read_1(iot, ioh, ioreg);
cksum *= 2;
if (cksum > 65535) cksum -= 65535;
cksum += *(u_short *) &hwaddr[2];
if (cksum > 65535) cksum -= 65535;

hwaddr[4] = bus_space_read_1(iot, ioh, ioreg);
hwaddr[5] = bus_space_read_1(iot, ioh, ioreg);
cksum *= 2;
if (cksum > 65535) cksum -= 65535;
cksum += *(u_short *)&hwaddr[4];
if (cksum >= 65535) cksum -= 65535;

/* 00-00-00 is an illegal OUI */
if (hwaddr[0] == 0 && hwaddr[1] == 0 && hwaddr[2] == 0)
return -1;

rom_cksum = bus_space_read_1(iot, ioh, ioreg);
rom_cksum |= bus_space_read_1(iot, ioh, ioreg) << 8;

if (cksum != rom_cksum)
return -1;
return 0;
}

static void
lemac_multicast_op(
uint16_t *mctbl,
const u_char *mca,
int enable)
{
u_int idx, bit, crc;

crc = ether_crc32_le(mca, ETHER_ADDR_LEN);

/*
* The following two lines convert the N bit index into a longword
* index and a longword mask.
*/
#if LEMAC_MCTBL_BITS < 0
crc >>= (32 + LEMAC_MCTBL_BITS);
crc &= (1 << -LEMAC_MCTBL_BITS) - 1;
#else
crc &= (1 << LEMAC_MCTBL_BITS) - 1;
#endif
bit = 1 << (crc & 0x0F);
idx = crc >> 4;

/* Set or clear hash filter bit in our table. */
if (enable)
mctbl[idx] |= bit; /* Set Bit */
else
mctbl[idx] &= ~bit; /* Clear Bit */
}

static void
lemac_multicast_filter(lemac_softc_t *sc)
{
struct ethercom *ec = &sc->sc_ec;
struct ether_multistep step;
struct ether_multi *enm;

memset(sc->sc_mctbl, 0, LEMAC_MCTBL_BITS / 8);

lemac_multicast_op(sc->sc_mctbl, etherbroadcastaddr, TRUE);

ETHER_LOCK(ec);
ETHER_FIRST_MULTI(step, ec, enm);
while (enm != NULL) {
if (!LEMAC_ADDREQUAL(enm->enm_addrlo, enm->enm_addrhi)) {
sc->sc_flags |= LEMAC_ALLMULTI;
sc->sc_if.if_flags |= IFF_ALLMULTI;
ETHER_UNLOCK(ec);
return;
}
lemac_multicast_op(sc->sc_mctbl, enm->enm_addrlo, TRUE);
ETHER_NEXT_MULTI(step, enm);
}
ETHER_UNLOCK(ec);
sc->sc_flags &= ~LEMAC_ALLMULTI;
sc->sc_if.if_flags &= ~IFF_ALLMULTI;
}

/*
* Do a hard reset of the board;
*/
static void
lemac_reset(lemac_softc_t * const sc)
{
unsigned data;

/*
* Initialize board..
*/
sc->sc_flags &= ~LEMAC_LINKUP;
sc->sc_if.if_flags &= ~IFF_OACTIVE;
LEMAC_INTR_DISABLE(sc);

LEMAC_OUTB(sc, LEMAC_REG_IOP, LEMAC_IOP_EEINIT);
DELAY(LEMAC_EEP_DELAY);

/*
* Read EEPROM information. NOTE - the placement of this function
* is important because functions hereafter may rely on information
* read from the EEPROM.
*/
if ((data = lemac_read_eeprom(sc)) != LEMAC_EEP_CKSUM) {
printf("%s: reset: EEPROM checksum failed (0x%x)\n",
sc->sc_if.if_xname, data);
return;
}

/* Update the control register to reflect the media choice */
data = LEMAC_INB(sc, LEMAC_REG_CTL);
if ((data & (LEMAC_CTL_APD | LEMAC_CTL_PSL)) != sc->sc_ctlmode) {
data &= ~(LEMAC_CTL_APD | LEMAC_CTL_PSL);
data |= sc->sc_ctlmode;
LEMAC_OUTB(sc, LEMAC_REG_CTL, data);
}

/* Force to 2K mode if not already configured. */

data = LEMAC_INB(sc, LEMAC_REG_MBR);
if (LEMAC_IS_2K_MODE(data)) {
sc->sc_flags |= LEMAC_2K_MODE;
} else if (LEMAC_IS_64K_MODE(data)) {
data = (((data * 2) & 0xF) << 4);
sc->sc_flags |= LEMAC_WAS_64K_MODE;
LEMAC_OUTB(sc, LEMAC_REG_MBR, data);
} else if (LEMAC_IS_32K_MODE(data)) {
data = ((data & 0xF) << 4);
sc->sc_flags |= LEMAC_WAS_32K_MODE;
LEMAC_OUTB(sc, LEMAC_REG_MBR, data);
} else {
sc->sc_flags |= LEMAC_PIO_MODE;
/* PIO mode */
}

/* Initialize Free Memory Queue, Init mcast table with broadcast. */

lemac_init_adapmem(sc);
sc->sc_flags |= LEMAC_ALIVE;
}

static void
lemac_init(lemac_softc_t * const sc)
{
if ((sc->sc_flags & LEMAC_ALIVE) == 0)
return;

/*
* If the interface has the up flag
*/
if (sc->sc_if.if_flags & IFF_UP) {
int saved_cs = LEMAC_INB(sc, LEMAC_REG_CS);
LEMAC_OUTB(sc, LEMAC_REG_CS,
saved_cs | (LEMAC_CS_TXD | LEMAC_CS_RXD));
LEMAC_OUTB(sc, LEMAC_REG_PA0, sc->sc_enaddr[0]);
LEMAC_OUTB(sc, LEMAC_REG_PA1, sc->sc_enaddr[1]);
LEMAC_OUTB(sc, LEMAC_REG_PA2, sc->sc_enaddr[2]);
LEMAC_OUTB(sc, LEMAC_REG_PA3, sc->sc_enaddr[3]);
LEMAC_OUTB(sc, LEMAC_REG_PA4, sc->sc_enaddr[4]);
LEMAC_OUTB(sc, LEMAC_REG_PA5, sc->sc_enaddr[5]);

LEMAC_OUTB(sc, LEMAC_REG_IC,
LEMAC_INB(sc, LEMAC_REG_IC) | LEMAC_IC_IE);

if (sc->sc_if.if_flags & IFF_PROMISC) {
LEMAC_OUTB(sc, LEMAC_REG_CS,
LEMAC_CS_MCE | LEMAC_CS_PME);
} else {
LEMAC_INTR_DISABLE(sc);
lemac_multicast_filter(sc);
if (sc->sc_flags & LEMAC_ALLMULTI)
memcpy(sc->sc_mctbl, lemac_allmulti_mctbl,
sizeof(sc->sc_mctbl));
if (LEMAC_USE_PIO_MODE(sc)) {
LEMAC_OUTB(sc, LEMAC_REG_IOP, 0);
LEMAC_OUTB(sc, LEMAC_REG_PI1,
LEMAC_MCTBL_OFF & 0xFF);
LEMAC_OUTB(sc, LEMAC_REG_PI2,
LEMAC_MCTBL_OFF >> 8);
LEMAC_OUTSB(sc, LEMAC_REG_DAT,
sizeof(sc->sc_mctbl),
(void *)sc->sc_mctbl);
} else {
LEMAC_OUTB(sc, LEMAC_REG_MPN, 0);
LEMAC_PUTBUF8(sc, LEMAC_MCTBL_OFF,
sizeof(sc->sc_mctbl),
(void *)sc->sc_mctbl);
}

LEMAC_OUTB(sc, LEMAC_REG_CS, LEMAC_CS_MCE);
}

LEMAC_OUTB(sc, LEMAC_REG_CTL,
LEMAC_INB(sc, LEMAC_REG_CTL) ^ LEMAC_CTL_LED);

LEMAC_INTR_ENABLE(sc);
sc->sc_if.if_flags |= IFF_RUNNING;
lemac_ifstart(&sc->sc_if);
} else {
LEMAC_OUTB(sc, LEMAC_REG_CS, LEMAC_CS_RXD | LEMAC_CS_TXD);

LEMAC_INTR_DISABLE(sc);
sc->sc_if.if_flags &= ~IFF_RUNNING;
}
}

static void
lemac_ifstart(
struct ifnet *ifp)
{
lemac_softc_t * const sc = LEMAC_IFP_TO_SOFTC(ifp);

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

LEMAC_INTR_DISABLE(sc);

for (;;) {
struct mbuf *m;
struct mbuf *m0;
int tx_pg;

IFQ_POLL(&ifp->if_snd, m);
if (m == NULL)
break;

if ((sc->sc_csr.csr_tqc = LEMAC_INB(sc, LEMAC_REG_TQC))
>= lemac_txmax) {
sc->sc_cntrs.cntr_txfull++;
ifp->if_flags |= IFF_OACTIVE;
break;
}

/* Get free memory page */
tx_pg = sc->sc_csr.csr_fmq = LEMAC_INB(sc, LEMAC_REG_FMQ);

/* Check for good transmit page. */
if (tx_pg == 0 || tx_pg > sc->sc_lastpage) {
sc->sc_cntrs.cntr_txnospc++;
ifp->if_flags |= IFF_OACTIVE;
break;
}

IFQ_DEQUEUE(&ifp->if_snd, m);

/*
* The first four bytes of each transmit buffer are for
* control information. The first byte is the control
* byte, then the length (why not word aligned?), then
* the offset to the buffer.
*/

if (LEMAC_USE_PIO_MODE(sc)) {
/* Shift 2K window. */
LEMAC_OUTB(sc, LEMAC_REG_IOP, tx_pg);

LEMAC_OUTB(sc, LEMAC_REG_PI1, 0);
LEMAC_OUTB(sc, LEMAC_REG_PI2, 0);
LEMAC_OUTB(sc, LEMAC_REG_DAT, sc->sc_txctl);
LEMAC_OUTB(sc, LEMAC_REG_DAT,
(m->m_pkthdr.len >> 0) & 0xFF);
LEMAC_OUTB(sc, LEMAC_REG_DAT,
(m->m_pkthdr.len >> 8) & 0xFF);
LEMAC_OUTB(sc, LEMAC_REG_DAT, LEMAC_TX_HDRSZ);
for (m0 = m; m0 != NULL; m0 = m0->m_next)
LEMAC_OUTSB(sc, LEMAC_REG_DAT,
m0->m_len, m0->m_data);
} else {
bus_size_t txoff = /* (mtod(m, uint32_t) & (sizeof(uint32_t) - 1)) + */ LEMAC_TX_HDRSZ;

/* Shift 2K window. */
LEMAC_OUTB(sc, LEMAC_REG_MPN, tx_pg);

LEMAC_PUT8(sc, 0, sc->sc_txctl);
LEMAC_PUT8(sc, 1, (m->m_pkthdr.len >> 0) & 0xFF);
LEMAC_PUT8(sc, 2, (m->m_pkthdr.len >> 8) & 0xFF);
LEMAC_PUT8(sc, 3, txoff);

/* Copy the packet to the board */
for (m0 = m; m0 != NULL; m0 = m0->m_next) {
#if 0
LEMAC_PUTBUF8(sc, txoff, m0->m_len, m0->m_data);
txoff += m0->m_len;
#else
const uint8_t *cp = m0->m_data;
int len = m0->m_len;
#if 0
if ((txoff & 3) == (((long)cp) & 3)
&& len >= 4) {
if (txoff & 3) {
int alen = (~txoff & 3);
LEMAC_PUTBUF8(sc, txoff, alen,
cp);
cp += alen;
txoff += alen;
len -= alen;
}
if (len >= 4) {
LEMAC_PUTBUF32(sc, txoff,
len / 4, cp);
cp += len & ~3;
txoff += len & ~3;
len &= 3;
}
}
#endif
if ((txoff & 1) == (((long)cp) & 1)
&& len >= 2) {
if (txoff & 1) {
int alen = (~txoff & 1);
LEMAC_PUTBUF8(sc, txoff, alen,
cp);
cp += alen;
txoff += alen;
len -= alen;
}
if (len >= 2) {
LEMAC_PUTBUF16(sc, txoff,
len / 2, (const void *)cp);
cp += len & ~1;
txoff += len & ~1;
len &= 1;
}
}
if (len > 0) {
LEMAC_PUTBUF8(sc, txoff, len, cp);
txoff += len;
}
#endif
}
}

/* Tell chip to transmit this packet */
LEMAC_OUTB(sc, LEMAC_REG_TQ, tx_pg);
bpf_mtap(&sc->sc_if, m, BPF_D_OUT);
m_freem(m); /* Free the mbuf */
}
LEMAC_INTR_ENABLE(sc);
}

static int
lemac_ifioctl(
struct ifnet *ifp,
u_long cmd,
void *data)
{
lemac_softc_t * const sc = LEMAC_IFP_TO_SOFTC(ifp);
int s;
int error = 0;

s = splnet();

switch (cmd) {
case SIOCINITIFADDR: {
struct ifaddr *ifa = (struct ifaddr *)data;

ifp->if_flags |= IFF_UP;
lemac_init(sc);
switch (ifa->ifa_addr->sa_family) {
#ifdef INET
case AF_INET:
arp_ifinit(&sc->sc_if, ifa);
break;
#endif /* INET */

default:
break;
}
break;
}

case SIOCSIFFLAGS:
if ((error = ifioctl_common(ifp, cmd, data)) != 0)
break;
lemac_init(sc);
break;

case SIOCADDMULTI:
case SIOCDELMULTI:
/*
* Update multicast listeners
*/
if ((error = ether_ioctl(ifp, cmd, data)) == ENETRESET) {
/* reset multicast filtering */
if (ifp->if_flags & IFF_RUNNING)
lemac_init(sc);
error = 0;
}
break;

default:
error = ether_ioctl(ifp, cmd, data);
break;
}

splx(s);
return error;
}

static int
lemac_ifmedia_change(struct ifnet * const ifp)
{
lemac_softc_t * const sc = LEMAC_IFP_TO_SOFTC(ifp);
unsigned new_ctl;

switch (IFM_SUBTYPE(sc->sc_ifmedia.ifm_media)) {
case IFM_10_T: new_ctl = LEMAC_CTL_APD; break;
case IFM_10_2:
case IFM_10_5: new_ctl = LEMAC_CTL_APD | LEMAC_CTL_PSL; break;
case IFM_AUTO: new_ctl = 0; break;
default: return EINVAL;
}
if (sc->sc_ctlmode != new_ctl) {
sc->sc_ctlmode = new_ctl;
lemac_reset(sc);
if (sc->sc_if.if_flags & IFF_UP)
lemac_init(sc);
}
return 0;
}

/*
* Media status callback
*/
static void
lemac_ifmedia_status(struct ifnet * const ifp, struct ifmediareq *req)
{
lemac_softc_t *sc = LEMAC_IFP_TO_SOFTC(ifp);
unsigned data = LEMAC_INB(sc, LEMAC_REG_CNF);

req->ifm_status = IFM_AVALID;
if (sc->sc_flags & LEMAC_LINKUP)
req->ifm_status |= IFM_ACTIVE;

if (sc->sc_ctlmode & LEMAC_CTL_APD) {
if (sc->sc_ctlmode & LEMAC_CTL_PSL)
req->ifm_active = IFM_10_5;
else
req->ifm_active = IFM_10_T;
} else {
/*
* The link bit of the configuration register reflects the
* current media choice when auto-port is enabled.
*/
if (data & LEMAC_CNF_NOLINK)
req->ifm_active = IFM_10_5;
else
req->ifm_active = IFM_10_T;
}

req->ifm_active |= IFM_ETHER;
}

int
lemac_port_check(const bus_space_tag_t iot, const bus_space_handle_t ioh)
{
unsigned char hwaddr[6];

if (lemac_read_macaddr(hwaddr, iot, ioh, LEMAC_REG_APD, 0) == 0)
return 1;
if (lemac_read_macaddr(hwaddr, iot, ioh, LEMAC_REG_APD, 1) == 0)
return 1;
return 0;
}

void
lemac_info_get(const bus_space_tag_t iot, const bus_space_handle_t ioh,
bus_addr_t *maddr_p, bus_size_t *msize_p, int *irq_p)
{
unsigned data;

*irq_p = LEMAC_DECODEIRQ(bus_space_read_1(iot, ioh, LEMAC_REG_IC)
& LEMAC_IC_IRQMSK);

data = bus_space_read_1(iot, ioh, LEMAC_REG_MBR);
if (LEMAC_IS_2K_MODE(data)) {
*maddr_p = data * (2 * 1024) + (512 * 1024);
*msize_p = 2 * 1024;
} else if (LEMAC_IS_64K_MODE(data)) {
*maddr_p = data * 64 * 1024;
*msize_p = 64 * 1024;
} else if (LEMAC_IS_32K_MODE(data)) {
*maddr_p = data * 32 * 1024;
*msize_p = 32* 1024;
} else {
*maddr_p = 0;
*msize_p = 0;
}
}

/*
* What to do upon receipt of an interrupt.
*/
int
lemac_intr(void *arg)
{
lemac_softc_t * const sc = arg;
int cs_value;

LEMAC_INTR_DISABLE(sc); /* Mask interrupts */

/*
* Determine cause of interrupt. Receive events take
* priority over Transmit.
*/

cs_value = LEMAC_INB(sc, LEMAC_REG_CS);

/*
* Check for Receive Queue not being empty.
* Check for Transmit Done Queue not being empty.
*/

if (cs_value & LEMAC_CS_RNE)
lemac_rne_intr(sc);
if (cs_value & LEMAC_CS_TNE)
lemac_tne_intr(sc);

/*
* Check for Transmitter Disabled.
* Check for Receiver Disabled.
*/

if (cs_value & LEMAC_CS_TXD)
lemac_txd_intr(sc, cs_value);
if (cs_value & LEMAC_CS_RXD)
lemac_rxd_intr(sc, cs_value);

/* Toggle LED and unmask interrupts. */

sc->sc_csr.csr_cs = LEMAC_INB(sc, LEMAC_REG_CS);

LEMAC_OUTB(sc, LEMAC_REG_CTL,
LEMAC_INB(sc, LEMAC_REG_CTL) ^ LEMAC_CTL_LED);
LEMAC_INTR_ENABLE(sc); /* Unmask interrupts */

if (cs_value)
rnd_add_uint32(&sc->rnd_source, cs_value);

return 1;
}

void
lemac_shutdown(void *arg)
{

lemac_reset((lemac_softc_t *) arg);
}

static const char * const lemac_modes[4] = {
"PIO mode (internal 2KB window)",
"2KB window",
"changed 32KB window to 2KB",
"changed 64KB window to 2KB",
};

void
lemac_ifattach(lemac_softc_t *sc)
{
struct ifnet * const ifp = &sc->sc_if;

strlcpy(ifp->if_xname, device_xname(sc->sc_dev), IFNAMSIZ);

lemac_reset(sc);

(void)lemac_read_macaddr(sc->sc_enaddr, sc->sc_iot, sc->sc_ioh,
LEMAC_REG_APD, 0);

printf(": %s\n", sc->sc_prodname);

printf("%s: address %s, %dKB RAM, %s\n",
ifp->if_xname,
ether_sprintf(sc->sc_enaddr),
sc->sc_lastpage * 2 + 2,
lemac_modes[sc->sc_flags & LEMAC_MODE_MASK]);

ifp->if_softc = (void *)sc;
ifp->if_start = lemac_ifstart;
ifp->if_ioctl = lemac_ifioctl;

ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;

if (sc->sc_flags & LEMAC_ALIVE) {
int media;

IFQ_SET_READY(&ifp->if_snd);

if_attach(ifp);
if_deferred_start_init(ifp, NULL);
ether_ifattach(ifp, sc->sc_enaddr);

rnd_attach_source(&sc->rnd_source, device_xname(sc->sc_dev),
RND_TYPE_NET, RND_FLAG_DEFAULT);

/* Initialize ifmedia structures. */
sc->sc_ec.ec_ifmedia = &sc->sc_ifmedia;
ifmedia_init(&sc->sc_ifmedia, 0,
lemac_ifmedia_change, lemac_ifmedia_status);
if (sc->sc_prodname[4] == '5') /* DE205 is UTP/AUI */
ifmedia_add(&sc->sc_ifmedia, IFM_ETHER | IFM_AUTO,
0, 0);
if (sc->sc_prodname[4] != '3') /* DE204 & 205 have UTP */
ifmedia_add(&sc->sc_ifmedia, IFM_ETHER | IFM_10_T,
0, 0);
if (sc->sc_prodname[4] != '4') /* DE203 & 205 have BNC */
ifmedia_add(&sc->sc_ifmedia, IFM_ETHER | IFM_10_5,
0, 0);
switch (sc->sc_prodname[4]) {
case '3': media = IFM_10_5; break;
case '4': media = IFM_10_T; break;
default: media = IFM_AUTO; break;
}
ifmedia_set(&sc->sc_ifmedia, IFM_ETHER | media);
} else
printf("%s: disabled due to error\n", ifp->if_xname);
}