NetBSD-5.0.2/sys/arch/next68k/dev/mb8795.c
/* $NetBSD: mb8795.c,v 1.42 2007/10/17 19:56:03 garbled Exp $ */
/*
* Copyright (c) 1998 Darrin B. Jewell
* 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. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Darrin B. Jewell
* 4. 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mb8795.c,v 1.42 2007/10/17 19:56:03 garbled Exp $");
#include "opt_inet.h"
#include "bpfilter.h"
#include "rnd.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/syslog.h>
#include <sys/socket.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#if NRND > 0
#include <sys/rnd.h>
#endif
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_ether.h>
#include <net/if_media.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/if_inarp.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#endif
#if NBPFILTER > 0
#include <net/bpf.h>
#include <net/bpfdesc.h>
#endif
#include <machine/cpu.h>
#include <machine/bus.h>
#include <machine/intr.h>
/* @@@ this is here for the REALIGN_DMABUF hack below */
#include "nextdmareg.h"
#include "nextdmavar.h"
#include "mb8795reg.h"
#include "mb8795var.h"
#include "bmapreg.h"
#ifdef DEBUG
#define MB8795_DEBUG
#endif
#define PRINTF(x) printf x;
#ifdef MB8795_DEBUG
int mb8795_debug = 0;
#define DPRINTF(x) if (mb8795_debug) printf x;
#else
#define DPRINTF(x)
#endif
extern int turbo;
/*
* Support for
* Fujitsu Ethernet Data Link Controller (MB8795)
* and the Fujitsu Manchester Encoder/Decoder (MB502).
*/
void mb8795_shutdown(void *);
bus_dmamap_t mb8795_txdma_restart(bus_dmamap_t, void *);
void mb8795_start_dma(struct mb8795_softc *);
int mb8795_mediachange(struct ifnet *);
void mb8795_mediastatus(struct ifnet *, struct ifmediareq *);
void
mb8795_config(struct mb8795_softc *sc, int *media, int nmedia, int defmedia)
{
struct ifnet *ifp = &sc->sc_ethercom.ec_if;
DPRINTF(("%s: mb8795_config()\n",sc->sc_dev.dv_xname));
/* Initialize ifnet structure. */
bcopy(sc->sc_dev.dv_xname, ifp->if_xname, IFNAMSIZ);
ifp->if_softc = sc;
ifp->if_start = mb8795_start;
ifp->if_ioctl = mb8795_ioctl;
ifp->if_watchdog = mb8795_watchdog;
ifp->if_flags =
IFF_BROADCAST | IFF_NOTRAILERS;
/* Initialize media goo. */
ifmedia_init(&sc->sc_media, 0, mb8795_mediachange,
mb8795_mediastatus);
if (media != NULL) {
int i;
for (i = 0; i < nmedia; i++)
ifmedia_add(&sc->sc_media, media[i], 0, NULL);
ifmedia_set(&sc->sc_media, defmedia);
} else {
ifmedia_add(&sc->sc_media, IFM_ETHER|IFM_MANUAL, 0, NULL);
ifmedia_set(&sc->sc_media, IFM_ETHER|IFM_MANUAL);
}
/* Attach the interface. */
if_attach(ifp);
ether_ifattach(ifp, sc->sc_enaddr);
sc->sc_sh = shutdownhook_establish(mb8795_shutdown, sc);
if (sc->sc_sh == NULL)
panic("mb8795_config: can't establish shutdownhook");
#if NRND > 0
rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname,
RND_TYPE_NET, 0);
#endif
DPRINTF(("%s: leaving mb8795_config()\n",sc->sc_dev.dv_xname));
}
/*
* Media change callback.
*/
int
mb8795_mediachange(struct ifnet *ifp)
{
struct mb8795_softc *sc = ifp->if_softc;
int data;
if (turbo)
return (0);
switch IFM_SUBTYPE(sc->sc_media.ifm_media) {
case IFM_AUTO:
if ((bus_space_read_1(sc->sc_bmap_bst, sc->sc_bmap_bsh, BMAP_DATA) &
BMAP_DATA_UTPENABLED_MASK) ||
!(bus_space_read_1(sc->sc_bmap_bst, sc->sc_bmap_bsh, BMAP_DATA) &
BMAP_DATA_UTPCARRIER_MASK)) {
data = BMAP_DATA_UTPENABLE;
sc->sc_media.ifm_cur->ifm_data = IFM_ETHER|IFM_10_T;
} else {
data = BMAP_DATA_BNCENABLE;
sc->sc_media.ifm_cur->ifm_data = IFM_ETHER|IFM_10_2;
}
break;
case IFM_10_T:
data = BMAP_DATA_UTPENABLE;
break;
case IFM_10_2:
data = BMAP_DATA_BNCENABLE;
break;
default:
return (1);
break;
}
bus_space_write_1(sc->sc_bmap_bst, sc->sc_bmap_bsh,
BMAP_DDIR, BMAP_DDIR_UTPENABLE_MASK);
bus_space_write_1(sc->sc_bmap_bst, sc->sc_bmap_bsh,
BMAP_DATA, data);
return (0);
}
/*
* Media status callback.
*/
void
mb8795_mediastatus(struct ifnet *ifp, struct ifmediareq *ifmr)
{
struct mb8795_softc *sc = ifp->if_softc;
if (turbo)
return;
if (IFM_SUBTYPE(ifmr->ifm_active) == IFM_AUTO) {
ifmr->ifm_active = sc->sc_media.ifm_cur->ifm_data;
}
if (IFM_SUBTYPE(ifmr->ifm_active) == IFM_10_T) {
ifmr->ifm_status = IFM_AVALID;
if (!(bus_space_read_1(sc->sc_bmap_bst, sc->sc_bmap_bsh, BMAP_DATA) &
BMAP_DATA_UTPCARRIER_MASK))
ifmr->ifm_status |= IFM_ACTIVE;
} else {
ifmr->ifm_status &= ~IFM_AVALID; /* don't know for 10_2 */
}
return;
}
/****************************************************************/
#ifdef MB8795_DEBUG
#define XCHR(x) hexdigits[(x) & 0xf]
static void
mb8795_hex_dump(unsigned char *pkt, size_t len)
{
size_t i, j;
printf("00000000 ");
for(i=0; i<len; i++) {
printf("%c%c ", XCHR(pkt[i]>>4), XCHR(pkt[i]));
if ((i+1) % 16 == 8) {
printf(" ");
}
if ((i+1) % 16 == 0) {
printf(" %c", '|');
for(j=0; j<16; j++) {
printf("%c", pkt[i-15+j]>=32 && pkt[i-15+j]<127?pkt[i-15+j]:'.');
}
printf("%c\n%c%c%c%c%c%c%c%c ", '|',
XCHR((i+1)>>28),XCHR((i+1)>>24),XCHR((i+1)>>20),XCHR((i+1)>>16),
XCHR((i+1)>>12), XCHR((i+1)>>8), XCHR((i+1)>>4), XCHR(i+1));
}
}
printf("\n");
}
#undef XCHR
#endif
/*
* Controller receive interrupt.
*/
void
mb8795_rint(struct mb8795_softc *sc)
{
struct ifnet *ifp = &sc->sc_ethercom.ec_if;
int error = 0;
u_char rxstat;
u_char rxmask;
rxstat = MB_READ_REG(sc, MB8795_RXSTAT);
rxmask = MB_READ_REG(sc, MB8795_RXMASK);
MB_WRITE_REG(sc, MB8795_RXSTAT, MB8795_RXSTAT_CLEAR);
if (rxstat & MB8795_RXSTAT_RESET) {
DPRINTF(("%s: rx reset packet\n",
sc->sc_dev.dv_xname));
error++;
}
if (rxstat & MB8795_RXSTAT_SHORT) {
DPRINTF(("%s: rx short packet\n",
sc->sc_dev.dv_xname));
error++;
}
if (rxstat & MB8795_RXSTAT_ALIGNERR) {
DPRINTF(("%s: rx alignment error\n",
sc->sc_dev.dv_xname));
#if 0
error++;
#endif
}
if (rxstat & MB8795_RXSTAT_CRCERR) {
DPRINTF(("%s: rx CRC error\n",
sc->sc_dev.dv_xname));
#if 0
error++;
#endif
}
if (rxstat & MB8795_RXSTAT_OVERFLOW) {
DPRINTF(("%s: rx overflow error\n",
sc->sc_dev.dv_xname));
#if 0
error++;
#endif
}
if (error) {
ifp->if_ierrors++;
/* @@@ handle more gracefully, free memory, etc. */
}
if (rxstat & MB8795_RXSTAT_OK) {
struct mbuf *m;
int s;
s = spldma();
while ((m = MBDMA_RX_MBUF (sc))) {
/* CRC is included with the packet; trim it. */
m->m_pkthdr.len = m->m_len = m->m_len - ETHER_CRC_LEN;
m->m_pkthdr.rcvif = ifp;
/* Find receive length, keep crc */
/* enable DMA interrupts while we process the packet */
splx(s);
#if defined(MB8795_DEBUG)
/* Peek at the packet */
DPRINTF(("%s: received packet, at VA %p-%p,len %d\n",
sc->sc_dev.dv_xname,mtod(m,u_char *),mtod(m,u_char *)+m->m_len,m->m_len));
if (mb8795_debug > 3) {
mb8795_hex_dump(mtod(m,u_char *), m->m_pkthdr.len);
} else if (mb8795_debug > 2) {
mb8795_hex_dump(mtod(m,u_char *), m->m_pkthdr.len < 255 ? m->m_pkthdr.len : 128 );
}
#endif
#if NBPFILTER > 0
/*
* Pass packet to bpf if there is a listener.
*/
if (ifp->if_bpf)
bpf_mtap(ifp->if_bpf, m);
#endif
{
ifp->if_ipackets++;
/* Pass the packet up. */
(*ifp->if_input)(ifp, m);
}
s = spldma();
}
splx(s);
}
#ifdef MB8795_DEBUG
if (mb8795_debug) {
char sbuf[256];
bitmask_snprintf(rxstat, MB8795_RXSTAT_BITS, sbuf, sizeof(sbuf));
printf("%s: rx interrupt, rxstat = %s\n",
sc->sc_dev.dv_xname, sbuf);
bitmask_snprintf(MB_READ_REG(sc, MB8795_RXSTAT),
MB8795_RXSTAT_BITS, sbuf, sizeof(sbuf));
printf("rxstat = 0x%s\n", sbuf);
bitmask_snprintf(MB_READ_REG(sc, MB8795_RXMASK),
MB8795_RXMASK_BITS, sbuf, sizeof(sbuf));
printf("rxmask = 0x%s\n", sbuf);
bitmask_snprintf(MB_READ_REG(sc, MB8795_RXMODE),
MB8795_RXMODE_BITS, sbuf, sizeof(sbuf));
printf("rxmode = 0x%s\n", sbuf);
}
#endif
return;
}
/*
* Controller transmit interrupt.
*/
void
mb8795_tint(struct mb8795_softc *sc)
{
u_char txstat;
u_char txmask;
struct ifnet *ifp = &sc->sc_ethercom.ec_if;
panic ("tint");
txstat = MB_READ_REG(sc, MB8795_TXSTAT);
txmask = MB_READ_REG(sc, MB8795_TXMASK);
if ((txstat & MB8795_TXSTAT_READY) ||
(txstat & MB8795_TXSTAT_TXRECV)) {
/* printf("X"); */
MB_WRITE_REG(sc, MB8795_TXSTAT, MB8795_TXSTAT_CLEAR);
/* MB_WRITE_REG(sc, MB8795_TXMASK, txmask & ~MB8795_TXMASK_READYIE); */
/* MB_WRITE_REG(sc, MB8795_TXMASK, txmask & ~MB8795_TXMASK_TXRXIE); */
MB_WRITE_REG(sc, MB8795_TXMASK, 0);
if ((ifp->if_flags & IFF_RUNNING) && !IF_IS_EMPTY(&sc->sc_tx_snd)) {
void mb8795_start_dma(struct mb8795_softc *); /* XXXX */
/* printf ("Z"); */
mb8795_start_dma(sc);
}
return;
}
if (txstat & MB8795_TXSTAT_SHORTED) {
printf("%s: tx cable shorted\n", sc->sc_dev.dv_xname);
ifp->if_oerrors++;
}
if (txstat & MB8795_TXSTAT_UNDERFLOW) {
printf("%s: tx underflow\n", sc->sc_dev.dv_xname);
ifp->if_oerrors++;
}
if (txstat & MB8795_TXSTAT_COLLERR) {
DPRINTF(("%s: tx collision\n", sc->sc_dev.dv_xname));
ifp->if_collisions++;
}
if (txstat & MB8795_TXSTAT_COLLERR16) {
printf("%s: tx 16th collision\n", sc->sc_dev.dv_xname);
ifp->if_oerrors++;
ifp->if_collisions += 16;
}
#if 0
if (txstat & MB8795_TXSTAT_READY) {
char sbuf[256];
bitmask_snprintf(txstat, MB8795_TXSTAT_BITS, sbuf, sizeof(sbuf));
panic("%s: unexpected tx interrupt %s",
sc->sc_dev.dv_xname, sbuf);
/* turn interrupt off */
MB_WRITE_REG(sc, MB8795_TXMASK, txmask & ~MB8795_TXMASK_READYIE);
}
#endif
return;
}
/****************************************************************/
void
mb8795_reset(struct mb8795_softc *sc)
{
int s;
int i;
s = splnet();
DPRINTF (("%s: mb8795_reset()\n",sc->sc_dev.dv_xname));
sc->sc_ethercom.ec_if.if_flags &= ~(IFF_RUNNING|IFF_OACTIVE);
sc->sc_ethercom.ec_if.if_timer = 0;
MBDMA_RESET(sc);
MB_WRITE_REG(sc, MB8795_RESET, MB8795_RESET_MODE);
mb8795_mediachange(&sc->sc_ethercom.ec_if);
#if 0 /* This interrupt was sometimes failing to ack correctly
* causing a loop @@@
*/
MB_WRITE_REG(sc, MB8795_TXMASK,
MB8795_TXMASK_UNDERFLOWIE | MB8795_TXMASK_COLLIE | MB8795_TXMASK_COLL16IE
| MB8795_TXMASK_PARERRIE);
#else
MB_WRITE_REG(sc, MB8795_TXMASK, 0);
#endif
MB_WRITE_REG(sc, MB8795_TXSTAT, MB8795_TXSTAT_CLEAR);
#if 0
MB_WRITE_REG(sc, MB8795_RXMASK,
MB8795_RXMASK_OKIE | MB8795_RXMASK_RESETIE | MB8795_RXMASK_SHORTIE |
MB8795_RXMASK_ALIGNERRIE | MB8795_RXMASK_CRCERRIE | MB8795_RXMASK_OVERFLOWIE);
#else
MB_WRITE_REG(sc, MB8795_RXMASK,
MB8795_RXMASK_OKIE | MB8795_RXMASK_RESETIE | MB8795_RXMASK_SHORTIE);
#endif
MB_WRITE_REG(sc, MB8795_RXSTAT, MB8795_RXSTAT_CLEAR);
for(i=0;i<sizeof(sc->sc_enaddr);i++) {
MB_WRITE_REG(sc, MB8795_ENADDR+i, sc->sc_enaddr[i]);
}
DPRINTF(("%s: initializing ethernet %02x:%02x:%02x:%02x:%02x:%02x, size=%d\n",
sc->sc_dev.dv_xname,
sc->sc_enaddr[0],sc->sc_enaddr[1],sc->sc_enaddr[2],
sc->sc_enaddr[3],sc->sc_enaddr[4],sc->sc_enaddr[5],
sizeof(sc->sc_enaddr)));
MB_WRITE_REG(sc, MB8795_RESET, 0);
splx(s);
}
void
mb8795_watchdog(struct ifnet *ifp)
{
struct mb8795_softc *sc = ifp->if_softc;
log(LOG_ERR, "%s: device timeout\n", sc->sc_dev.dv_xname);
++ifp->if_oerrors;
DPRINTF(("%s: %lld input errors, %lld input packets\n",
sc->sc_dev.dv_xname, ifp->if_ierrors, ifp->if_ipackets));
ifp->if_flags &= ~IFF_RUNNING;
mb8795_init(sc);
}
/*
* Initialization of interface; set up initialization block
* and transmit/receive descriptor rings.
*/
void
mb8795_init(struct mb8795_softc *sc)
{
struct ifnet *ifp = &sc->sc_ethercom.ec_if;
int s;
DPRINTF (("%s: mb8795_init()\n",sc->sc_dev.dv_xname));
if (ifp->if_flags & IFF_UP) {
int rxmode;
s = spldma();
if ((ifp->if_flags & IFF_RUNNING) == 0)
mb8795_reset(sc);
if (ifp->if_flags & IFF_PROMISC)
rxmode = MB8795_RXMODE_PROMISCUOUS;
else
rxmode = MB8795_RXMODE_NORMAL;
/* XXX add support for multicast */
if (turbo)
rxmode |= MB8795_RXMODE_TEST;
/* switching mode probably borken now with turbo */
MB_WRITE_REG(sc, MB8795_TXMODE,
turbo ? MB8795_TXMODE_TURBO1 : MB8795_TXMODE_LB_DISABLE);
MB_WRITE_REG(sc, MB8795_RXMODE, rxmode);
if ((ifp->if_flags & IFF_RUNNING) == 0) {
MBDMA_RX_SETUP(sc);
MBDMA_TX_SETUP(sc);
ifp->if_flags |= IFF_RUNNING;
ifp->if_flags &= ~IFF_OACTIVE;
ifp->if_timer = 0;
MBDMA_RX_GO(sc);
}
splx(s);
#if 0
s = spldma();
if (! IF_IS_EMPTY(&sc->sc_tx_snd)) {
mb8795_start_dma(ifp);
}
splx(s);
#endif
} else {
mb8795_reset(sc);
}
}
void
mb8795_shutdown(void *arg)
{
struct mb8795_softc *sc = (struct mb8795_softc *)arg;
DPRINTF(("%s: mb8795_shutdown()\n",sc->sc_dev.dv_xname));
mb8795_reset(sc);
}
/****************************************************************/
int
mb8795_ioctl(struct ifnet *ifp, u_long cmd, void *data)
{
struct mb8795_softc *sc = ifp->if_softc;
struct ifaddr *ifa = (struct ifaddr *)data;
struct ifreq *ifr = (struct ifreq *)data;
int s, error = 0;
s = splnet();
DPRINTF(("%s: mb8795_ioctl()\n",sc->sc_dev.dv_xname));
switch (cmd) {
case SIOCSIFADDR:
DPRINTF(("%s: mb8795_ioctl() SIOCSIFADDR\n",sc->sc_dev.dv_xname));
ifp->if_flags |= IFF_UP;
switch (ifa->ifa_addr->sa_family) {
#ifdef INET
case AF_INET:
mb8795_init(sc);
arp_ifinit(ifp, ifa);
break;
#endif
default:
mb8795_init(sc);
break;
}
break;
case SIOCSIFFLAGS:
DPRINTF(("%s: mb8795_ioctl() SIOCSIFFLAGS\n",sc->sc_dev.dv_xname));
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.
*/
/* ifp->if_flags &= ~IFF_RUNNING; */
mb8795_reset(sc);
} 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.
*/
mb8795_init(sc);
} else {
/*
* Reset the interface to pick up changes in any other
* flags that affect hardware registers.
*/
mb8795_init(sc);
}
#ifdef MB8795_DEBUG
if (ifp->if_flags & IFF_DEBUG)
sc->sc_debug = 1;
else
sc->sc_debug = 0;
#endif
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
DPRINTF(("%s: mb8795_ioctl() SIOCADDMULTI\n",
sc->sc_dev.dv_xname));
if ((error = ether_ioctl(ifp, cmd, data)) == ENETRESET) {
/*
* Multicast list has changed; set the hardware filter
* accordingly.
*/
if (ifp->if_flags & IFF_RUNNING)
mb8795_init(sc);
error = 0;
}
break;
case SIOCGIFMEDIA:
case SIOCSIFMEDIA:
DPRINTF(("%s: mb8795_ioctl() SIOCSIFMEDIA\n",sc->sc_dev.dv_xname));
error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd);
break;
default:
error = EINVAL;
break;
}
splx(s);
#if 0
DPRINTF(("DEBUG: mb8795_ioctl(0x%lx) returning %d\n",
cmd,error));
#endif
return (error);
}
/*
* Setup output on interface.
* Get another datagram to send off of the interface queue, and map it to the
* interface before starting the output.
* Called only at splnet or interrupt level.
*/
void
mb8795_start(struct ifnet *ifp)
{
struct mb8795_softc *sc = ifp->if_softc;
struct mbuf *m;
int s;
DPRINTF(("%s: mb8795_start()\n",sc->sc_dev.dv_xname));
#ifdef DIAGNOSTIC
IFQ_POLL(&ifp->if_snd, m);
if (m == 0) {
panic("%s: No packet to start",
sc->sc_dev.dv_xname);
}
#endif
while (1) {
if ((ifp->if_flags & (IFF_RUNNING | IFF_OACTIVE)) != IFF_RUNNING)
return;
#if 0
return; /* @@@ Turn off xmit for debugging */
#endif
ifp->if_flags |= IFF_OACTIVE;
IFQ_DEQUEUE(&ifp->if_snd, m);
if (m == 0) {
ifp->if_flags &= ~IFF_OACTIVE;
return;
}
#if NBPFILTER > 0
/*
* Pass packet to bpf if there is a listener.
*/
if (ifp->if_bpf)
bpf_mtap(ifp->if_bpf, m);
#endif
s = spldma();
IF_ENQUEUE(&sc->sc_tx_snd, m);
if (!MBDMA_TX_ISACTIVE(sc))
mb8795_start_dma(sc);
splx(s);
ifp->if_flags &= ~IFF_OACTIVE;
}
}
void
mb8795_start_dma(struct mb8795_softc *sc)
{
struct ifnet *ifp = &sc->sc_ethercom.ec_if;
struct mbuf *m;
u_char txmask;
DPRINTF(("%s: mb8795_start_dma()\n",sc->sc_dev.dv_xname));
#if (defined(DIAGNOSTIC))
{
u_char txstat;
txstat = MB_READ_REG(sc, MB8795_TXSTAT);
if (!turbo && !(txstat & MB8795_TXSTAT_READY)) {
/* @@@ I used to panic here, but then it paniced once.
* Let's see if I can just reset instead. [ dbj 980706.1900 ]
*/
printf("%s: transmitter not ready\n",
sc->sc_dev.dv_xname);
ifp->if_flags &= ~IFF_RUNNING;
mb8795_init(sc);
return;
}
}
#endif
#if 0
return; /* @@@ Turn off xmit for debugging */
#endif
IF_DEQUEUE(&sc->sc_tx_snd, m);
if (m == 0) {
#ifdef DIAGNOSTIC
panic("%s: No packet to start_dma",
sc->sc_dev.dv_xname);
#endif
return;
}
MB_WRITE_REG(sc, MB8795_TXSTAT, MB8795_TXSTAT_CLEAR);
txmask = MB_READ_REG(sc, MB8795_TXMASK);
/* MB_WRITE_REG(sc, MB8795_TXMASK, txmask | MB8795_TXMASK_READYIE); */
/* MB_WRITE_REG(sc, MB8795_TXMASK, txmask | MB8795_TXMASK_TXRXIE); */
ifp->if_timer = 5;
if (MBDMA_TX_MBUF(sc, m))
return;
MBDMA_TX_GO(sc);
if (turbo)
MB_WRITE_REG(sc, MB8795_TXMODE, MB8795_TXMODE_TURBO1 | MB8795_TXMODE_TURBOSTART);
ifp->if_opackets++;
}
/****************************************************************/