/* #define IYMEMDEBUG */

/* $NetBSD: if_iy.c,v 1.114 2022/09/17 17:21:52 thorpej Exp $ */
/* #define IYDEBUG */
/* #define IYMEMDEBUG */

/*-
* Copyright (c) 1996,2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Ignatios Souvatzis.
*
* 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. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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.
*/

/*
* Supported hardware:
*
* - Intel EtherExpress Pro/10.
* - possibly other boards using the i82595 chip and no special tweaks.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_iy.c,v 1.114 2022/09/17 17:21:52 thorpej 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/ioctl.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <sys/device.h>
#include <sys/endian.h>
#include <sys/rndsource.h>

#include <net/if.h>
#include <net/if_types.h>
#include <net/if_dl.h>
#include <net/bpf.h>
#include <net/if_ether.h>
#include <net/if_media.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/cpu.h>
#include <sys/bus.h>
#include <sys/intr.h>

#include <dev/isa/isareg.h>
#include <dev/isa/isavar.h>
#include <dev/ic/i82595reg.h>

/* XXX why isn't this centralized? */
#ifndef __BUS_SPACE_HAS_STREAM_METHODS
#define bus_space_write_stream_2 bus_space_write_2
#define bus_space_write_multi_stream_2 bus_space_write_multi_2
#define bus_space_read_stream_2 bus_space_read_2
#define bus_space_read_multi_stream_2 bus_space_read_multi_2
#endif /* __BUS_SPACE_HAS_STREAM_METHODS */

/*
* Ethernet status, per interface.
*/
struct iy_softc {
device_t sc_dev;
void *sc_ih;

bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;

struct ethercom sc_ethercom;

struct ifmedia iy_ifmedia;
int iy_media;

int mappedirq;

int hard_vers;

u_short promisc;

int sram, tx_size, rx_size;

int tx_start, tx_end, tx_last;
bool tx_busy;

int rx_start;

int doing_mc_setup;
#ifdef IYDEBUG
int sc_debug;
#endif

krndsource_t rnd_source;
};

void iywatchdog(struct ifnet *);
int iyioctl(struct ifnet *, u_long, void *);
int iyintr(void *);
void iyinit(struct iy_softc *);
void iystop(struct iy_softc *);
void iystart(struct ifnet *);

void iy_intr_rx(struct iy_softc *);
void iy_intr_tx(struct iy_softc *);

void iyreset(struct iy_softc *);
void iy_readframe(struct iy_softc *, int);
void iy_drop_packet_buffer(struct iy_softc *);
void iy_find_mem_size(struct iy_softc *);
void iyrint(struct iy_softc *);
void iytint(struct iy_softc *);
void iyxmit(struct iy_softc *);
static void iy_mc_setup(struct iy_softc *);
static void iy_mc_reset(struct iy_softc *);
void iyget(struct iy_softc *, bus_space_tag_t, bus_space_handle_t, int);
void iyprobemem(struct iy_softc *);
static inline void eepromwritebit(bus_space_tag_t, bus_space_handle_t, int);
static inline int eepromreadbit(bus_space_tag_t, bus_space_handle_t);

#ifdef IYDEBUGX
void print_rbd(volatile struct iy_recv_buf_desc *);

int in_ifrint = 0;
int in_iftint = 0;
#endif

int iy_mediachange(struct ifnet *);
void iy_mediastatus(struct ifnet *, struct ifmediareq *);

int iyprobe(device_t, cfdata_t, void *);
void iyattach(device_t, device_t, void *);

static uint16_t eepromread(bus_space_tag_t, bus_space_handle_t, int);

static int eepromreadall(bus_space_tag_t, bus_space_handle_t, uint16_t *,
int);

CFATTACH_DECL_NEW(iy, sizeof(struct iy_softc),
iyprobe, iyattach, NULL, NULL);

static uint8_t eepro_irqmap[] = EEPP_INTMAP;
static uint8_t eepro_revirqmap[] = EEPP_RINTMAP;

int
iyprobe(device_t parent, cfdata_t match, void *aux)
{
struct isa_attach_args *ia = aux;
uint16_t eaddr[8];
bus_space_tag_t iot;
bus_space_handle_t ioh;
uint8_t c, d;
int irq;

if (ia->ia_nio < 1)
return 0;
if (ia->ia_nirq < 1)
return 0;

if (ISA_DIRECT_CONFIG(ia))
return 0;

iot = ia->ia_iot;

if (ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT)
return 0;

if (bus_space_map(iot, ia->ia_io[0].ir_addr, 16, 0, &ioh))
return 0;

/* try to find the round robin sig: */

c = bus_space_read_1(iot, ioh, ID_REG);
if ((c & ID_REG_MASK) != ID_REG_SIG)
goto out;

d = bus_space_read_1(iot, ioh, ID_REG);
if ((d & ID_REG_MASK) != ID_REG_SIG)
goto out;

if (((d-c) & R_ROBIN_BITS) != 0x40)
goto out;

d = bus_space_read_1(iot, ioh, ID_REG);
if ((d & ID_REG_MASK) != ID_REG_SIG)
goto out;

if (((d-c) & R_ROBIN_BITS) != 0x80)
goto out;

d = bus_space_read_1(iot, ioh, ID_REG);
if ((d & ID_REG_MASK) != ID_REG_SIG)
goto out;

if (((d-c) & R_ROBIN_BITS) != 0xC0)
goto out;

d = bus_space_read_1(iot, ioh, ID_REG);
if ((d & ID_REG_MASK) != ID_REG_SIG)
goto out;

if (((d-c) & R_ROBIN_BITS) != 0x00)
goto out;

#ifdef IYDEBUG
printf("iyprobe verified working ID reg.\n");
#endif

if (eepromreadall(iot, ioh, eaddr, 8))
goto out;

if (ia->ia_irq[0].ir_irq == ISA_UNKNOWN_IRQ)
irq = eepro_irqmap[eaddr[EEPPW1] & EEPP_Int];
else
irq = ia->ia_irq[0].ir_irq;

if (irq >= sizeof(eepro_revirqmap))
goto out;

if (eepro_revirqmap[irq] == 0xff)
goto out;

/* now lets reset the chip */

bus_space_write_1(iot, ioh, COMMAND_REG, RESET_CMD);
delay(200);

ia->ia_nio = 1;
ia->ia_io[0].ir_size = 16;

ia->ia_nirq = 1;
ia->ia_irq[0].ir_irq = irq;

ia->ia_niomem = 0;
ia->ia_ndrq = 0;

bus_space_unmap(iot, ioh, 16);
return 1; /* found */
out:
bus_space_unmap(iot, ioh, 16);
return 0;
}

void
iyattach(device_t parent, device_t self, void *aux)
{
struct iy_softc *sc = device_private(self);
struct isa_attach_args *ia = aux;
struct ifnet *ifp = &sc->sc_ethercom.ec_if;
bus_space_tag_t iot;
bus_space_handle_t ioh;
unsigned temp;
uint16_t eaddr[8];
uint8_t myaddr[ETHER_ADDR_LEN];
int eirq;

sc->sc_dev = self;
iot = ia->ia_iot;

if (bus_space_map(iot, ia->ia_io[0].ir_addr, 16, 0, &ioh)) {
aprint_error(": can't map i/o space\n");
return;
}

sc->sc_iot = iot;
sc->sc_ioh = ioh;

sc->mappedirq = eepro_revirqmap[ia->ia_irq[0].ir_irq];

/* now let's reset the chip */

bus_space_write_1(iot, ioh, COMMAND_REG, RESET_CMD);
delay(200);

iyprobemem(sc);

strlcpy(ifp->if_xname, device_xname(sc->sc_dev), IFNAMSIZ);
ifp->if_softc = sc;
ifp->if_start = iystart;
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;

sc->doing_mc_setup = 0;

ifp->if_ioctl = iyioctl;
ifp->if_watchdog = iywatchdog;

IFQ_SET_READY(&ifp->if_snd);

(void)eepromreadall(iot, ioh, eaddr, 8);
sc->hard_vers = eaddr[EEPW6] & EEPP_BoardRev;

#ifdef DIAGNOSTICS
if ((eaddr[EEPPEther0] !=
eepromread(iot, ioh, EEPPEther0a)) &&
(eaddr[EEPPEther1] !=
eepromread(iot, ioh, EEPPEther1a)) &&
(eaddr[EEPPEther2] !=
eepromread(iot, ioh, EEPPEther2a)))

aprint_error("EEPROM Ethernet address differs from copy\n");
#endif

myaddr[1] = eaddr[EEPPEther0] & 0xFF;
myaddr[0] = eaddr[EEPPEther0] >> 8;
myaddr[3] = eaddr[EEPPEther1] & 0xFF;
myaddr[2] = eaddr[EEPPEther1] >> 8;
myaddr[5] = eaddr[EEPPEther2] & 0xFF;
myaddr[4] = eaddr[EEPPEther2] >> 8;

/* Initialize ifmedia structures. */
sc->sc_ethercom.ec_ifmedia = &sc->iy_ifmedia;
ifmedia_init(&sc->iy_ifmedia, 0, iy_mediachange, iy_mediastatus);
ifmedia_add(&sc->iy_ifmedia, IFM_ETHER | IFM_10_2, 0, NULL);
ifmedia_add(&sc->iy_ifmedia, IFM_ETHER | IFM_10_5, 0, NULL);
ifmedia_add(&sc->iy_ifmedia, IFM_ETHER | IFM_10_T, 0, NULL);
ifmedia_add(&sc->iy_ifmedia, IFM_ETHER | IFM_AUTO, 0, NULL);
ifmedia_set(&sc->iy_ifmedia, IFM_ETHER | IFM_AUTO);
/* Attach the interface. */
if_attach(ifp);
ether_ifattach(ifp, myaddr);
aprint_normal(": address %s, rev. %d, %d kB\n",
ether_sprintf(myaddr),
sc->hard_vers, sc->sram/1024);

eirq = eepro_irqmap[eaddr[EEPPW1] & EEPP_Int];
if (eirq != ia->ia_irq[0].ir_irq)
aprint_error("%s: EEPROM irq setting %d ignored\n",
device_xname(sc->sc_dev), eirq);

sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq[0].ir_irq,
IST_EDGE, IPL_NET, iyintr, sc);

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

temp = bus_space_read_1(iot, ioh, INT_NO_REG);
bus_space_write_1(iot, ioh, INT_NO_REG, (temp & 0xf8) | sc->mappedirq);
}

void
iystop(struct iy_softc *sc)
{
bus_space_tag_t iot;
bus_space_handle_t ioh;
#ifdef IYDEBUG
u_int p, v;
#endif

iot = sc->sc_iot;
ioh = sc->sc_ioh;

bus_space_write_1(iot, ioh, COMMAND_REG, RCV_DISABLE_CMD);

bus_space_write_1(iot, ioh, INT_MASK_REG, ALL_INTS);
bus_space_write_1(iot, ioh, STATUS_REG, ALL_INTS);

bus_space_write_1(iot, ioh, COMMAND_REG, RESET_CMD);
delay(200);
#ifdef IYDEBUG
printf("%s: dumping tx chain (st 0x%x end 0x%x last 0x%x)\n",
device_xname(sc->sc_dev), sc->tx_start, sc->tx_end, sc->tx_last);
p = sc->tx_last;
if (!p)
p = sc->tx_start;
do {
char sbuf[128];

bus_space_write_2(iot, ioh, HOST_ADDR_REG, p);

v = le16toh(bus_space_read_stream_2(iot, ioh, MEM_PORT_REG));
snprintb(sbuf, sizeof(sbuf), "\020\006Ab\010Dn", v);
printf("0x%04x: %s ", p, sbuf);

v = le16toh(bus_space_read_stream_2(iot, ioh, MEM_PORT_REG));
snprintb(sbuf, sizeof(sbuf),
"\020\6MAX_COL\7HRT_BEAT\010TX_DEF\011UND_RUN"
"\012JERR\013LST_CRS\014LTCOL\016TX_OK\020COLL", v);
printf("%s", sbuf);

p = le16toh(bus_space_read_stream_2(iot, ioh, MEM_PORT_REG));
printf(" 0x%04x", p);

v = le16toh(bus_space_read_stream_2(iot, ioh, MEM_PORT_REG));
snprintb(sbuf, sizeof(sbuf), "\020\020Ch", v);
printf(" %s\n", sbuf);

} while (v & 0x8000);
#endif
sc->tx_start = sc->tx_end = sc->rx_size;
sc->tx_last = 0;
sc->sc_ethercom.ec_if.if_flags &= ~IFF_RUNNING;
sc->tx_busy = false;
}

void
iyreset(struct iy_softc *sc)
{
int s;
s = splnet();
iystop(sc);
iyinit(sc);
splx(s);
}

void
iyinit(struct iy_softc *sc)
{
int i;
unsigned temp;
struct ifnet *ifp;
bus_space_tag_t iot;
bus_space_handle_t ioh;

iot = sc->sc_iot;
ioh = sc->sc_ioh;

ifp = &sc->sc_ethercom.ec_if;
#ifdef IYDEBUG
printf("ifp is %p\n", ifp);
#endif

bus_space_write_1(iot, ioh, 0, BANK_SEL(2));

temp = bus_space_read_1(iot, ioh, EEPROM_REG);
if (temp & 0x10)
bus_space_write_1(iot, ioh, EEPROM_REG, temp & ~0x10);

for (i=0; i<6; ++i) {
bus_space_write_1(iot, ioh, I_ADD(i), CLLADDR(ifp->if_sadl)[i]);
}

temp = bus_space_read_1(iot, ioh, REG1);
bus_space_write_1(iot, ioh, REG1,
temp | /* XMT_CHAIN_INT | XMT_CHAIN_ERRSTOP | */ RCV_DISCARD_BAD);

if (ifp->if_flags & (IFF_PROMISC | IFF_ALLMULTI))
temp = MATCH_ALL;
else
temp = MATCH_BRDCST;

bus_space_write_1(iot, ioh, RECV_MODES_REG, temp);

#ifdef IYDEBUG
{
char sbuf[128];

snprintb(sbuf, sizeof(sbuf),
"\020\1PRMSC\2NOBRDST\3SEECRC\4LENGTH\5NOSaIns\6MultiIA",
temp);

printf("%s: RECV_MODES set to %s\n", device_xname(sc->sc_dev),
sbuf);
}
#endif
/* XXX VOODOO */
temp = bus_space_read_1(iot, ioh, MEDIA_SELECT);
bus_space_write_1(iot, ioh, MEDIA_SELECT, temp);
/* XXX END OF VOODOO */

delay(500000); /* for the hardware to test for the connector */

temp = bus_space_read_1(iot, ioh, MEDIA_SELECT);
#ifdef IYDEBUG
{
char sbuf[128];

snprintb(sbuf, sizeof(sbuf),
"\020\1LnkInDis\2PolCor\3TPE\4JabberDis\5NoAport\6BNC",
temp);
printf("%s: media select was %s ", device_xname(sc->sc_dev),
sbuf);
}
#endif
temp = (temp & TEST_MODE_MASK);

switch (IFM_SUBTYPE(sc->iy_ifmedia.ifm_media)) {
case IFM_10_5:
temp &= ~ (BNC_BIT | TPE_BIT);
break;

case IFM_10_2:
temp = (temp & ~TPE_BIT) | BNC_BIT;
break;

case IFM_10_T:
temp = (temp & ~BNC_BIT) | TPE_BIT;
break;
default:
;
/* nothing; leave as it is */
}
switch (temp & (BNC_BIT | TPE_BIT)) {
case BNC_BIT:
sc->iy_media = IFM_ETHER | IFM_10_2;
break;
case TPE_BIT:
sc->iy_media = IFM_ETHER | IFM_10_T;
break;
default:
sc->iy_media = IFM_ETHER | IFM_10_5;
}

bus_space_write_1(iot, ioh, MEDIA_SELECT, temp);
#ifdef IYDEBUG
{
char sbuf[128];

snprintb(sbuf, sizeof(sbuf),
"\020\1LnkInDis\2PolCor\3TPE\4JabberDis\5NoAport\6BNC",
temp);
printf("changed to %s\n", sbuf);
}
#endif

bus_space_write_1(iot, ioh, 0, BANK_SEL(0));
bus_space_write_1(iot, ioh, INT_MASK_REG, ALL_INTS);
bus_space_write_1(iot, ioh, 0, BANK_SEL(1));

temp = bus_space_read_1(iot, ioh, INT_NO_REG);
bus_space_write_1(iot, ioh, INT_NO_REG, (temp & 0xf8) | sc->mappedirq);

#ifdef IYDEBUG
{
char sbuf[128];

snprintb(sbuf, sizeof(sbuf),
"\020\4bad_irq\010flash/boot present", temp);

printf("%s: int no was %s\n", device_xname(sc->sc_dev), sbuf);

temp = bus_space_read_1(iot, ioh, INT_NO_REG);
snprintb(sbuf, sizeof(sbuf),
"\020\4bad_irq\010flash/boot present", temp);
printf("%s: int no now %s\n", device_xname(sc->sc_dev), sbuf);
}
#endif

bus_space_write_1(iot, ioh, RCV_LOWER_LIMIT_REG, 0);
bus_space_write_1(iot, ioh, RCV_UPPER_LIMIT_REG, (sc->rx_size -2) >>8);
bus_space_write_1(iot, ioh, XMT_LOWER_LIMIT_REG, sc->rx_size >>8);
bus_space_write_1(iot, ioh, XMT_UPPER_LIMIT_REG, (sc->sram - 2) >>8);

temp = bus_space_read_1(iot, ioh, REG1);
#ifdef IYDEBUG
{
char sbuf[128];

snprintb(sbuf, sizeof(sbuf), "\020\2WORD_WIDTH\010INT_ENABLE",
temp);

printf("%s: HW access is %s\n", device_xname(sc->sc_dev), sbuf);
}
#endif
bus_space_write_1(iot, ioh, REG1, temp | INT_ENABLE); /* XXX what about WORD_WIDTH? */

#ifdef IYDEBUG
{
char sbuf[128];

temp = bus_space_read_1(iot, ioh, REG1);
snprintb(sbuf, sizeof(sbuf), "\020\2WORD_WIDTH\010INT_ENABLE",
temp);
printf("%s: HW access is %s\n", device_xname(sc->sc_dev), sbuf);
}
#endif

bus_space_write_1(iot, ioh, 0, BANK_SEL(0));

bus_space_write_1(iot, ioh, INT_MASK_REG,
ALL_INTS & ~(RX_BIT | TX_BIT));
bus_space_write_1(iot, ioh, STATUS_REG, ALL_INTS); /* clear ints */

bus_space_write_1(iot, ioh, RCV_COPY_THRESHOLD, 0);

bus_space_write_2(iot, ioh, RCV_START_LOW, 0);
bus_space_write_2(iot, ioh, RCV_STOP_LOW, sc->rx_size - 2);
sc->rx_start = 0;

bus_space_write_1(iot, ioh, 0, SEL_RESET_CMD);
delay(200);

bus_space_write_2(iot, ioh, XMT_ADDR_REG, sc->rx_size);

sc->tx_start = sc->tx_end = sc->rx_size;
sc->tx_last = 0;

bus_space_write_1(iot, ioh, 0, RCV_ENABLE_CMD);

ifp->if_flags |= IFF_RUNNING;
sc->tx_busy = false;
}

void
iystart(struct ifnet *ifp)
{
struct iy_softc *sc;

struct mbuf *m0, *m;
u_int len, pad, last, end;
u_int llen, residual;
int avail;
char *data;
unsigned temp;
uint16_t resval, stat;
bus_space_tag_t iot;
bus_space_handle_t ioh;

#ifdef IYDEBUG
printf("iystart called\n");
#endif
sc = ifp->if_softc;

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

if (sc->tx_busy)
return;

iy_intr_tx(sc);

iot = sc->sc_iot;
ioh = sc->sc_ioh;

for (;;) {
IFQ_POLL(&ifp->if_snd, m0);
if (m0 == NULL)
break;
#ifdef IYDEBUG
printf("%s: trying to write another packet to the hardware\n",
device_xname(sc->sc_dev));
#endif

/* We need to use m->m_pkthdr.len, so require the header */
if ((m0->m_flags & M_PKTHDR) == 0)
panic("iystart: no header mbuf");

len = m0->m_pkthdr.len;
pad = len & 1;

#ifdef IYDEBUG
printf("%s: length is %d.\n", device_xname(sc->sc_dev), len);
#endif
if (len < (ETHER_MIN_LEN - ETHER_CRC_LEN)) {
pad = ETHER_MIN_LEN - ETHER_CRC_LEN - len;
}

if (len + pad > ETHER_MAX_LEN) {
/* packet is obviously too large: toss it */
if_statinc(ifp, if_oerrors);
IFQ_DEQUEUE(&ifp->if_snd, m0);
m_freem(m0);
continue;
}

bpf_mtap(ifp, m0, BPF_D_OUT);

avail = sc->tx_start - sc->tx_end;
if (avail <= 0)
avail += sc->tx_size;

#ifdef IYDEBUG
printf("%s: avail is %d.\n", device_xname(sc->sc_dev), avail);
#endif
/*
* we MUST RUN at splnet here ---
* XXX todo: or even turn off the boards ints ??? hm...
*/

/* See if there is room to put another packet in the buffer. */

if ((len+pad+2*I595_XMT_HDRLEN) > avail) {
#ifdef IYDEBUG
printf("%s: len = %d, avail = %d, setting tx_busy\n",
device_xname(sc->sc_dev), len, avail);
#endif
/* mark interface as full ... */
sc->tx_busy = true;

/* and wait for any transmission result */
bus_space_write_1(iot, ioh, 0, BANK_SEL(2));

temp = bus_space_read_1(iot, ioh, REG1);
bus_space_write_1(iot, ioh, REG1,
temp & ~XMT_CHAIN_INT);

bus_space_write_1(iot, ioh, 0, BANK_SEL(0));

return;
}

/* we know it fits in the hardware now, so dequeue it */
IFQ_DEQUEUE(&ifp->if_snd, m0);

last = sc->tx_end;
end = last + pad + len + I595_XMT_HDRLEN;

if (end >= sc->sram) {
if ((sc->sram - last) <= I595_XMT_HDRLEN) {
/* keep header in one piece */
last = sc->rx_size;
end = last + pad + len + I595_XMT_HDRLEN;
} else
end -= sc->tx_size;
}

bus_space_write_2(iot, ioh, HOST_ADDR_REG, last);
bus_space_write_stream_2(iot, ioh, MEM_PORT_REG,
htole16(XMT_CMD));

bus_space_write_2(iot, ioh, MEM_PORT_REG, 0);
bus_space_write_2(iot, ioh, MEM_PORT_REG, 0);

bus_space_write_stream_2(iot, ioh, MEM_PORT_REG,
htole16(len + pad));

residual = resval = 0;

while ((m = m0)!=0) {
data = mtod(m, void *);
llen = m->m_len;
if (residual) {
#ifdef IYDEBUG
printf("%s: merging residual with next mbuf.\n",
device_xname(sc->sc_dev));
#endif
resval |= *data << 8;
bus_space_write_stream_2(iot, ioh,
MEM_PORT_REG, resval);
--llen;
++data;
}
/*
* XXX ALIGNMENT LOSSAGE HERE.
*/
if (llen > 1)
bus_space_write_multi_stream_2(iot, ioh,
MEM_PORT_REG, (uint16_t *) data,
llen>>1);
residual = llen & 1;
if (residual) {
resval = *(data + llen - 1);
#ifdef IYDEBUG
printf("%s: got odd mbuf to send.\n",
device_xname(sc->sc_dev));
#endif
}

m0 = m_free(m);
}

if (residual)
bus_space_write_stream_2(iot, ioh, MEM_PORT_REG,
resval);

pad >>= 1;
while (pad-- > 0)
bus_space_write_stream_2(iot, ioh, MEM_PORT_REG, 0);

#ifdef IYDEBUG
printf("%s: new last = 0x%x, end = 0x%x.\n",
device_xname(sc->sc_dev), last, end);
printf("%s: old start = 0x%x, end = 0x%x, last = 0x%x\n",
device_xname(sc->sc_dev), sc->tx_start, sc->tx_end,
sc->tx_last);
#endif

if (sc->tx_start != sc->tx_end) {
bus_space_write_2(iot, ioh, HOST_ADDR_REG,
sc->tx_last + XMT_COUNT);

/*
* XXX We keep stat in le order, to potentially save
* a byte swap.
*/
stat = bus_space_read_stream_2(iot, ioh, MEM_PORT_REG);

bus_space_write_2(iot, ioh, HOST_ADDR_REG,
sc->tx_last + XMT_CHAIN);

bus_space_write_stream_2(iot, ioh, MEM_PORT_REG,
htole16(last));

bus_space_write_stream_2(iot, ioh, MEM_PORT_REG,
stat | htole16(CHAIN));
#ifdef IYDEBUG
printf("%s: setting 0x%x to 0x%x\n",
device_xname(sc->sc_dev), sc->tx_last + XMT_COUNT,
le16toh(stat) | CHAIN);
#endif
}
/* dummy read */
stat = bus_space_read_2(iot, ioh, MEM_PORT_REG);

/* XXX todo: enable ints here if disabled */

if_statinc(ifp, if_opackets);

if (sc->tx_start == sc->tx_end) {
bus_space_write_2(iot, ioh, XMT_ADDR_REG, last);
bus_space_write_1(iot, ioh, 0, XMT_CMD);
sc->tx_start = last;
#ifdef IYDEBUG
printf("%s: writing 0x%x to XAR and giving XCMD\n",
device_xname(sc->sc_dev), last);
#endif
} else {
bus_space_write_1(iot, ioh, 0, RESUME_XMT_CMD);
#ifdef IYDEBUG
printf("%s: giving RESUME_XCMD\n",
device_xname(sc->sc_dev));
#endif
}
sc->tx_last = last;
sc->tx_end = end;
}
/* and wait only for end of transmission chain */
bus_space_write_1(iot, ioh, 0, BANK_SEL(2));

temp = bus_space_read_1(iot, ioh, REG1);
bus_space_write_1(iot, ioh, REG1, temp | XMT_CHAIN_INT);

bus_space_write_1(iot, ioh, 0, BANK_SEL(0));
}

static inline void
eepromwritebit(bus_space_tag_t iot, bus_space_handle_t ioh, int what)
{
bus_space_write_1(iot, ioh, EEPROM_REG, what);
delay(1);
bus_space_write_1(iot, ioh, EEPROM_REG, what | EESK);
delay(1);
bus_space_write_1(iot, ioh, EEPROM_REG, what);
delay(1);
}

static inline int
eepromreadbit(bus_space_tag_t iot, bus_space_handle_t ioh)
{
int b;

bus_space_write_1(iot, ioh, EEPROM_REG, EECS | EESK);
delay(1);
b = bus_space_read_1(iot, ioh, EEPROM_REG);
bus_space_write_1(iot, ioh, EEPROM_REG, EECS);
delay(1);

return ((b & EEDO) != 0);
}

static uint16_t
eepromread(bus_space_tag_t iot, bus_space_handle_t ioh, int offset)
{
volatile int i;
volatile int j;
volatile uint16_t readval;

bus_space_write_1(iot, ioh, 0, BANK_SEL(2));
delay(1);
bus_space_write_1(iot, ioh, EEPROM_REG, EECS); /* XXXX??? */
delay(1);

eepromwritebit(iot, ioh, EECS | EEDI);
eepromwritebit(iot, ioh, EECS | EEDI);
eepromwritebit(iot, ioh, EECS);

for (j=5; j>=0; --j) {
if ((offset>>j) & 1)
eepromwritebit(iot, ioh, EECS | EEDI);
else
eepromwritebit(iot, ioh, EECS);
}

for (readval=0, i=0; i<16; ++i) {
readval<<=1;
readval |= eepromreadbit(iot, ioh);
}

bus_space_write_1(iot, ioh, EEPROM_REG, 0 | EESK);
delay(1);
bus_space_write_1(iot, ioh, EEPROM_REG, 0);

bus_space_write_1(iot, ioh, COMMAND_REG, BANK_SEL(0));

return readval;
}

/*
* Device timeout/watchdog routine. Entered if the device neglects to generate
* an interrupt after a transmit has been started on it.
*/
void
iywatchdog(struct ifnet *ifp)
{
struct iy_softc *sc = ifp->if_softc;

log(LOG_ERR, "%s: device timeout\n", device_xname(sc->sc_dev));
if_statinc(ifp, if_oerrors);
iyreset(sc);
}

/*
* What to do upon receipt of an interrupt.
*/
int
iyintr(void *arg)
{
struct iy_softc *sc;
struct ifnet *ifp;
bus_space_tag_t iot;
bus_space_handle_t ioh;

u_short status;

sc = arg;
iot = sc->sc_iot;
ioh = sc->sc_ioh;

ifp = &sc->sc_ethercom.ec_if;

status = bus_space_read_1(iot, ioh, STATUS_REG);
#ifdef IYDEBUG
if (status & ALL_INTS) {
char sbuf[128];

snprintb(sbuf, sizeof(sbuf), "\020\1RX_STP\2RX\3TX\4EXEC",
status);
printf("%s: got interrupt %s", device_xname(sc->sc_dev), sbuf);

if (status & EXEC_INT) {
snprintb(sbuf, sizeof(sbuf),
"\020\6ABORT", bus_space_read_1(iot, ioh, 0));
printf(" event %s\n", sbuf);
} else
printf("\n");
}
#endif
if ((status & (RX_INT | TX_INT)) == 0)
return 0;

if (status & RX_INT) {
iy_intr_rx(sc);
bus_space_write_1(iot, ioh, STATUS_REG, RX_INT);
}
if (status & TX_INT) {
/* Tell feeders we may be able to accept more data... */
sc->tx_busy = false;
/* and get more data. */
iystart(ifp);
bus_space_write_1(iot, ioh, STATUS_REG, TX_INT);
}

rnd_add_uint32(&sc->rnd_source, status);

return 1;
}

void
iyget(struct iy_softc *sc, bus_space_tag_t iot, bus_space_handle_t ioh,
int rxlen)
{
struct mbuf *m, *top, **mp;
struct ifnet *ifp;
int len;

ifp = &sc->sc_ethercom.ec_if;

MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == 0)
goto dropped;
m_set_rcvif(m, ifp);
m->m_pkthdr.len = rxlen;
len = MHLEN;
top = 0;
mp = &top;

while (rxlen > 0) {
if (top) {
MGET(m, M_DONTWAIT, MT_DATA);
if (m == 0) {
m_freem(top);
goto dropped;
}
len = MLEN;
}
if (rxlen >= MINCLSIZE) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
m_free(m);
m_freem(top);
goto dropped;
}
len = MCLBYTES;
}
len = uimin(rxlen, len);
/*
* XXX ALIGNMENT LOSSAGE HERE.
*/
if (len > 1) {
len &= ~1;

bus_space_read_multi_stream_2(iot, ioh, MEM_PORT_REG,
mtod(m, uint16_t *), len / 2);
} else {
#ifdef IYDEBUG
printf("%s: received odd mbuf\n",
device_xname(sc->sc_dev));
#endif
*(mtod(m, char *)) = bus_space_read_stream_2(iot, ioh,
MEM_PORT_REG);
}
m->m_len = len;
rxlen -= len;
*mp = m;
mp = &m->m_next;
}

if (top == NULL)
return;

if_percpuq_enqueue(ifp->if_percpuq, top);
return;

dropped:
if_statinc(ifp, if_ierrors);
return;
}

void
iy_intr_rx(struct iy_softc *sc)
{
bus_space_tag_t iot;
bus_space_handle_t ioh;

u_int rxadrs, rxevnt, rxstatus, rxnext, rxlen;

iot = sc->sc_iot;
ioh = sc->sc_ioh;

rxadrs = sc->rx_start;
bus_space_write_2(iot, ioh, HOST_ADDR_REG, rxadrs);
rxevnt = le16toh(bus_space_read_stream_2(iot, ioh, MEM_PORT_REG));
rxnext = 0;

while (rxevnt == RCV_DONE) {
rxstatus = le16toh(bus_space_read_stream_2(iot, ioh,
MEM_PORT_REG));
rxnext = le16toh(bus_space_read_stream_2(iot, ioh,
MEM_PORT_REG));
rxlen = le16toh(bus_space_read_stream_2(iot, ioh,
MEM_PORT_REG));
#ifdef IYDEBUG
{
char sbuf[128];

snprintb(sbuf, sizeof(sbuf),
"\020\1RCLD\2IA_MCH\010SHORT\011OVRN\013ALGERR"
"\014CRCERR\015LENERR\016RCVOK\020TYP", rxstatus);

printf("%s: pck at 0x%04x stat %s next 0x%x len 0x%x\n",
device_xname(sc->sc_dev), rxadrs, sbuf, rxnext,
rxlen);
}
#else
__USE(rxstatus);
#endif
iyget(sc, iot, ioh, rxlen);

/* move stop address */
bus_space_write_2(iot, ioh, RCV_STOP_LOW,
rxnext == 0 ? sc->rx_size - 2 : rxnext - 2);

bus_space_write_2(iot, ioh, HOST_ADDR_REG, rxnext);
rxadrs = rxnext;
rxevnt = le16toh(bus_space_read_stream_2(iot, ioh,
MEM_PORT_REG));
}
sc->rx_start = rxnext;
}

void
iy_intr_tx(struct iy_softc *sc)
{
bus_space_tag_t iot;
bus_space_handle_t ioh;
struct ifnet *ifp;
u_int txstatus, txstat2, txlen, txnext;

ifp = &sc->sc_ethercom.ec_if;
iot = sc->sc_iot;
ioh = sc->sc_ioh;

while (sc->tx_start != sc->tx_end) {
bus_space_write_2(iot, ioh, HOST_ADDR_REG, sc->tx_start);
txstatus = le16toh(bus_space_read_stream_2(iot, ioh,
MEM_PORT_REG));

if ((txstatus & (TX_DONE | CMD_MASK)) != (TX_DONE | XMT_CMD))
break;

txstat2 = le16toh(bus_space_read_stream_2(iot, ioh,
MEM_PORT_REG));
txnext = le16toh(bus_space_read_stream_2(iot, ioh,
MEM_PORT_REG));
txlen = le16toh(bus_space_read_stream_2(iot, ioh,
MEM_PORT_REG));
#ifdef IYDEBUG
{
char sbuf[128];

snprintb(sbuf, sizeof(sbuf),
"\020\6MAX_COL\7HRT_BEAT\010TX_DEF"
"\011UND_RUN\012JERR\013LST_CRS"
"\014LTCOL\016TX_OK\020COLL", txstat2);

printf("txstat 0x%x stat2 %s next 0x%x len 0x%x\n",
txstatus, sbuf, txnext, txlen);
}
#endif
if (txlen & CHAIN)
sc->tx_start = txnext;
else
sc->tx_start = sc->tx_end;
sc->tx_busy = false;

if (txstat2 & 0x0020)
if_statadd(ifp, if_collisions, 16);
else
if_statadd(ifp, if_collisions, txstat2 & 0x000f);

if ((txstat2 & 0x2000) == 0)
if_statinc(ifp, if_oerrors);
}
}

int
iyioctl(struct ifnet *ifp, u_long cmd, void *data)
{
struct iy_softc *sc;
struct ifaddr *ifa;
int s, error = 0;

sc = ifp->if_softc;
ifa = (struct ifaddr *)data;

#ifdef IYDEBUG
printf("iyioctl called with ifp %p (%s) cmd 0x%lx data %p\n",
ifp, ifp->if_xname, cmd, data);
#endif

s = splnet();

switch (cmd) {

case SIOCINITIFADDR:
ifp->if_flags |= IFF_UP;

iyinit(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;
sc->promisc = ifp->if_flags & (IFF_PROMISC | IFF_ALLMULTI);
/* 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.
*/
iystop(sc);
ifp->if_flags &= ~IFF_RUNNING;
break;
case IFF_UP:
/*
* If interface is marked up and it is stopped, then
* start it.
*/
iyinit(sc);
break;
default:
/*
* Reset the interface to pick up changes in any other
* flags that affect hardware registers.
*/
iystop(sc);
iyinit(sc);
break;
}
#ifdef IYDEBUGX
if (ifp->if_flags & IFF_DEBUG)
sc->sc_debug = IFY_ALL;
else
sc->sc_debug = 0;
#endif
break;

case SIOCADDMULTI:
case SIOCDELMULTI:
if ((error = ether_ioctl(ifp, cmd, data)) == ENETRESET) {
/*
* Multicast list has changed; set the hardware filter
* accordingly.
*/
if (ifp->if_flags & IFF_RUNNING) {
/* XXX can't make it work otherwise */
iyreset(sc);
iy_mc_reset(sc);
}
error = 0;
}
break;

default:
error = ether_ioctl(ifp, cmd, data);
}
splx(s);
return error;
}

int
iy_mediachange(struct ifnet *ifp)
{
struct iy_softc *sc = ifp->if_softc;

if (IFM_TYPE(sc->iy_ifmedia.ifm_media) != IFM_ETHER)
return EINVAL;
switch (IFM_SUBTYPE(sc->iy_ifmedia.ifm_media)) {
case IFM_10_5:
case IFM_10_2:
case IFM_10_T:
case IFM_AUTO:
iystop(sc);
iyinit(sc);
return 0;
default:
return EINVAL;
}
}

void
iy_mediastatus(struct ifnet *ifp, struct ifmediareq *ifmr)
{
struct iy_softc *sc = ifp->if_softc;

ifmr->ifm_active = sc->iy_media;
ifmr->ifm_status = IFM_AVALID | IFM_ACTIVE;
}

static void
iy_mc_setup(struct iy_softc *sc)
{
struct ether_multi *enm;
struct ether_multistep step;
struct ethercom *ecp;
struct ifnet *ifp;
bus_space_tag_t iot;
bus_space_handle_t ioh;
int avail, last /*, end*/ , len;
int timeout;
volatile uint16_t dum;
uint8_t temp;

ecp = &sc->sc_ethercom;
ifp = &ecp->ec_if;

iot = sc->sc_iot;
ioh = sc->sc_ioh;

ETHER_LOCK(ecp);
len = 6 * ecp->ec_multicnt;

avail = sc->tx_start - sc->tx_end;
if (avail <= 0)
avail += sc->tx_size;
if (ifp->if_flags & IFF_DEBUG)
printf("%s: iy_mc_setup called, %d addresses, "
"%d/%d bytes needed/avail\n", ifp->if_xname,
ecp->ec_multicnt, len + I595_XMT_HDRLEN, avail);

last = sc->rx_size;

bus_space_write_1(iot, ioh, 0, BANK_SEL(2));
bus_space_write_1(iot, ioh, RECV_MODES_REG, MATCH_BRDCST);
/* XXX VOODOO */
temp = bus_space_read_1(iot, ioh, MEDIA_SELECT);
bus_space_write_1(iot, ioh, MEDIA_SELECT, temp);
/* XXX END OF VOODOO */
bus_space_write_1(iot, ioh, 0, BANK_SEL(0));
bus_space_write_2(iot, ioh, HOST_ADDR_REG, last);
bus_space_write_stream_2(iot, ioh, MEM_PORT_REG, htole16(MC_SETUP_CMD));
bus_space_write_2(iot, ioh, MEM_PORT_REG, 0);
bus_space_write_2(iot, ioh, MEM_PORT_REG, 0);
bus_space_write_stream_2(iot, ioh, MEM_PORT_REG, htole16(len));

ETHER_FIRST_MULTI(step, ecp, enm);
while (enm) {
/*
* XXX ALIGNMENT LOSSAGE HERE?
*/
bus_space_write_multi_stream_2(iot, ioh, MEM_PORT_REG,
(uint16_t *) enm->enm_addrlo, 3);

ETHER_NEXT_MULTI(step, enm);
}
ETHER_UNLOCK(ecp);
dum = bus_space_read_2(iot, ioh, MEM_PORT_REG); /* dummy read */
__USE(dum);
bus_space_write_2(iot, ioh, XMT_ADDR_REG, last);
bus_space_write_1(iot, ioh, 0, MC_SETUP_CMD);

sc->tx_start = sc->rx_size;
sc->tx_end = sc->rx_size + I595_XMT_HDRLEN + len;

for (timeout=0; timeout<100; timeout++) {
DELAY(2);
if ((bus_space_read_1(iot, ioh, STATUS_REG) & EXEC_INT) == 0)
continue;

temp = bus_space_read_1(iot, ioh, 0);
bus_space_write_1(iot, ioh, STATUS_REG, EXEC_INT);
#ifdef DIAGNOSTIC
if (temp & 0x20) {
aprint_error_dev(sc->sc_dev,
"mc setup failed, %d usec\n", timeout * 2);
} else if (((temp & 0x0f) == 0x03) &&
(ifp->if_flags & IFF_DEBUG)) {
printf("%s: mc setup done, %d usec\n",
device_xname(sc->sc_dev), timeout * 2);
}
#endif
break;
}
sc->tx_start = sc->tx_end;
sc->tx_busy = false;
}

static void
iy_mc_reset(struct iy_softc *sc)
{
struct ether_multi *enm;
struct ether_multistep step;
struct ethercom *ecp;
struct ifnet *ifp;
bus_space_tag_t iot;
bus_space_handle_t ioh;
uint16_t temp;

ecp = &sc->sc_ethercom;
ifp = &ecp->ec_if;

iot = sc->sc_iot;
ioh = sc->sc_ioh;

if (ecp->ec_multicnt > 63) {
ifp->if_flags |= IFF_ALLMULTI;

} else if (ecp->ec_multicnt > 0) {
/*
* Step through the list of addresses.
*/
ETHER_LOCK(ecp);
ETHER_FIRST_MULTI(step, ecp, enm);
while (enm) {
if (memcmp(enm->enm_addrlo, enm->enm_addrhi, 6) != 0) {
ifp->if_flags |= IFF_ALLMULTI;
ETHER_UNLOCK(ecp);
goto setupmulti;
}
ETHER_NEXT_MULTI(step, enm);
}
ETHER_UNLOCK(ecp);
/* OK, we really need to do it now: */
#if 0
if ((ifp->if_flags & IFF_RUNNING) == 0 || sc->tx_busy) {
/* XXX This logic is b0rk3n. */
sc->tx_busy = true;
sc->want_mc_setup = 1;
return;
}
#endif
iy_mc_setup(sc);
} else {
ifp->if_flags &= ~IFF_ALLMULTI;
}

setupmulti:
bus_space_write_1(iot, ioh, 0, BANK_SEL(2));
if (ifp->if_flags & (IFF_PROMISC | IFF_ALLMULTI))
temp = MATCH_ALL;
else
temp = MATCH_BRDCST;

bus_space_write_1(iot, ioh, RECV_MODES_REG, temp);
/* XXX VOODOO */
temp = bus_space_read_1(iot, ioh, MEDIA_SELECT);
bus_space_write_1(iot, ioh, MEDIA_SELECT, temp);
/* XXX END OF VOODOO */

/* XXX TBD: setup hardware for all multicasts */
bus_space_write_1(iot, ioh, 0, BANK_SEL(0));
return;
}

#ifdef IYDEBUGX
void
print_rbd(volatile struct ie_recv_buf_desc *rbd)
{
printf("RBD at %08lx:\nactual %04x, next %04x, buffer %08x\n"
"length %04x, mbz %04x\n", (u_long)rbd, rbd->ie_rbd_actual,
rbd->ie_rbd_next, rbd->ie_rbd_buffer, rbd->ie_rbd_length,
rbd->mbz);
}
#endif

void
iyprobemem(struct iy_softc *sc)
{
bus_space_tag_t iot;
bus_space_handle_t ioh;
int testing;

iot = sc->sc_iot;
ioh = sc->sc_ioh;

bus_space_write_1(iot, ioh, COMMAND_REG, BANK_SEL(0));
delay(1);
bus_space_write_2(iot, ioh, HOST_ADDR_REG, 4096-2);
bus_space_write_2(iot, ioh, MEM_PORT_REG, 0);

for (testing=65536; testing >= 4096; testing >>= 1) {
bus_space_write_2(iot, ioh, HOST_ADDR_REG, testing-2);
bus_space_write_2(iot, ioh, MEM_PORT_REG, 0xdead);
bus_space_write_2(iot, ioh, HOST_ADDR_REG, testing-2);
if (bus_space_read_2(iot, ioh, MEM_PORT_REG) != 0xdead) {
#ifdef IYMEMDEBUG
printf("%s: Didn't keep 0xdead at 0x%x\n",
device_xname(sc->sc_dev), testing-2);
#endif
continue;
}

bus_space_write_2(iot, ioh, HOST_ADDR_REG, testing-2);
bus_space_write_2(iot, ioh, MEM_PORT_REG, 0xbeef);
bus_space_write_2(iot, ioh, HOST_ADDR_REG, testing-2);
if (bus_space_read_2(iot, ioh, MEM_PORT_REG) != 0xbeef) {
#ifdef IYMEMDEBUG
printf("%s: Didn't keep 0xbeef at 0x%x\n",
device_xname(sc->sc_dev), testing-2);
#endif
continue;
}

bus_space_write_2(iot, ioh, HOST_ADDR_REG, 0);
bus_space_write_2(iot, ioh, MEM_PORT_REG, 0);
bus_space_write_2(iot, ioh, HOST_ADDR_REG, testing >> 1);
bus_space_write_2(iot, ioh, MEM_PORT_REG, testing >> 1);
bus_space_write_2(iot, ioh, HOST_ADDR_REG, 0);
if (bus_space_read_2(iot, ioh, MEM_PORT_REG) == (testing >> 1)) {
#ifdef IYMEMDEBUG
printf("%s: 0x%x alias of 0x0\n",
device_xname(sc->sc_dev), testing >> 1);
#endif
continue;
}

break;
}

sc->sram = testing;

switch (testing) {
case 65536:
/* 4 NFS packets + overhead RX, 2 NFS + overhead TX */
sc->rx_size = 44*1024;
break;

case 32768:
/* 2 NFS packets + overhead RX, 1 NFS + overhead TX */
sc->rx_size = 22*1024;
break;

case 16384:
/* 1 NFS packet + overhead RX, 4 big packets TX */
sc->rx_size = 10*1024;
break;
default:
sc->rx_size = testing/2;
break;
}
sc->tx_size = testing - sc->rx_size;
}

static int
eepromreadall(bus_space_tag_t iot, bus_space_handle_t ioh, uint16_t *wordp,
int maxi)
{
int i;
uint16_t checksum, tmp;

checksum = 0;

for (i=0; i<EEPP_LENGTH; ++i) {
tmp = eepromread(iot, ioh, i);
checksum += tmp;
if (i<maxi)
wordp[i] = tmp;
}

if (checksum != EEPP_CHKSUM) {
#ifdef IYDEBUG
printf("wrong EEPROM checksum 0x%x should be 0x%x\n",
checksum, EEPP_CHKSUM);
#endif
return 1;
}
return 0;
}