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freebsd-dev/sys/i386/isa/if_ar.c
Poul-Henning Kamp 4738ca443e Organize the various modes (CISCO/AUTO/DEMAND/LEASED) a little bit better, 
centralize the code.

Remember to call TLF/TLS on the hardware in CISCO mode.
1999-03-30 13:28:23 +00:00

1590 lines
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/*
* Copyright (c) 1995 John Hay. 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 John Hay.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY John Hay ``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 John Hay 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.
*
* $Id: if_ar.c,v 1.24 1998/12/16 18:42:38 phk Exp $
*/
/*
* Programming assumptions and other issues.
*
* The descriptors of a DMA channel will fit in a 16K memory window.
*
* The buffers of a transmit DMA channel will fit in a 16K memory window.
*
* Only the ISA bus cards with X.21 and V.35 is tested.
*
* When interface is going up, handshaking is set and it is only cleared
* when the interface is down'ed.
*
* There should be a way to set/reset Raw HDLC/PPP, Loopback, DCE/DTE,
* internal/external clock, etc.....
*
*/
#include "ar.h"
#include "bpfilter.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/sockio.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_sppp.h>
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#include <machine/clock.h>
#include <machine/md_var.h>
#include <i386/isa/if_arregs.h>
#include <i386/isa/ic/hd64570.h>
#include <i386/isa/isa_device.h>
#include "sppp.h"
#if NSPPP <= 0
#error device 'ar' require sppp.
#endif
#ifdef TRACE
#define TRC(x) x
#else
#define TRC(x)
#endif
#define TRCL(x) x
#define PPP_HEADER_LEN 4
#define ARC_GET_WIN(addr) ((addr >> ARC_WIN_SHFT) & AR_WIN_MSK)
#define ARC_SET_MEM(iobase,win) outb(iobase+AR_MSCA_EN, AR_ENA_MEM | \
ARC_GET_WIN(win))
#define ARC_SET_SCA(iobase,ch) outb(iobase+AR_MSCA_EN, AR_ENA_MEM | \
AR_ENA_SCA | (ch ? AR_SEL_SCA_1:AR_SEL_SCA_0))
#define ARC_SET_OFF(iobase) outb(iobase+AR_MSCA_EN, 0)
static struct ar_hardc {
int cunit;
struct ar_softc *sc;
u_short iobase;
int startunit;
int numports;
caddr_t mem_start;
caddr_t mem_end;
u_int memsize; /* in bytes */
u_char bustype; /* ISA, MCA, PCI.... */
u_char interface; /* X21, V.35, EIA-530.... */
u_char revision;
u_char handshake; /* handshake lines supported by card. */
u_char txc_dtr[NPORT/NCHAN]; /* the register is write only */
u_int txc_dtr_off[NPORT/NCHAN];
sca_regs *sca;
}ar_hardc[NAR];
struct ar_softc {
struct sppp ifsppp;
int unit; /* With regards to all ar devices */
int subunit; /* With regards to this card */
struct ar_hardc *hc;
struct buf_block {
u_int txdesc; /* On card address */
u_int txstart; /* On card address */
u_int txend; /* On card address */
u_int txtail; /* Index of first unused buffer */
u_int txmax; /* number of usable buffers/descriptors */
u_int txeda; /* Error descriptor addresses */
}block[AR_TX_BLOCKS];
char xmit_busy; /* Transmitter is busy */
char txb_inuse; /* Number of tx blocks currently in use */
char txb_new; /* Index to where new buffer will be added */
char txb_next_tx; /* Index to next block ready to tx */
u_int rxdesc; /* On card address */
u_int rxstart; /* On card address */
u_int rxend; /* On card address */
u_int rxhind; /* Index to the head of the rx buffers. */
u_int rxmax; /* number of usable buffers/descriptors */
int scano;
int scachan;
};
static int arprobe(struct isa_device *id);
static int arattach(struct isa_device *id);
/*
* This translate from irq numbers to
* the value that the arnet card needs
* in the lower part of the AR_INT_SEL
* register.
*/
static int irqtable[16] = {
0, /* 0 */
0, /* 1 */
0, /* 2 */
1, /* 3 */
0, /* 4 */
2, /* 5 */
0, /* 6 */
3, /* 7 */
0, /* 8 */
0, /* 9 */
4, /* 10 */
5, /* 11 */
6, /* 12 */
0, /* 13 */
0, /* 14 */
7 /* 15 */
};
struct isa_driver ardriver = {arprobe, arattach, "arc"};
static ointhand2_t arintr;
static void ar_xmit(struct ar_softc *sc);
static void arstart(struct ifnet *ifp);
static int arioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
static void arwatchdog(struct ifnet *ifp);
static int ar_packet_avail(struct ar_softc *sc, int *len, u_char *rxstat);
static void ar_copy_rxbuf(struct mbuf *m, struct ar_softc *sc, int len);
static void ar_eat_packet(struct ar_softc *sc, int single);
static void ar_get_packets(struct ar_softc *sc);
static void ar_up(struct ar_softc *sc);
static void ar_down(struct ar_softc *sc);
static void arc_init(struct isa_device *id);
static void ar_init_sca(struct ar_hardc *hc, int scano);
static void ar_init_msci(struct ar_softc *sc);
static void ar_init_rx_dmac(struct ar_softc *sc);
static void ar_init_tx_dmac(struct ar_softc *sc);
static void ar_dmac_intr(struct ar_hardc *hc, int scano, u_char isr);
static void ar_msci_intr(struct ar_hardc *hc, int scano, u_char isr);
static void ar_timer_intr(struct ar_hardc *hc, int scano, u_char isr);
/*
* Register the Adapter.
* Probe to see if it is there.
* Get its information and fill it in.
*/
static int
arprobe(struct isa_device *id)
{
struct ar_hardc *hc = &ar_hardc[id->id_unit];
u_int tmp;
u_short port;
/*
* Register the card.
*/
/*
* Now see if the card is realy there.
*
* XXX For now I just check the undocumented ports
* for "570". We will probably have to do more checking.
*/
port = id->id_iobase;
if((inb(port+AR_ID_5) != '5') || (inb(port+AR_ID_7) != '7') ||
(inb(port+AR_ID_0) != '0'))
return 0;
/*
* We have a card here, fill in what we can.
*/
tmp = inb(port + AR_BMI);
hc->bustype = tmp & AR_BUS_MSK;
hc->memsize = (tmp & AR_MEM_MSK) >> AR_MEM_SHFT;
hc->memsize = 1 << hc->memsize;
hc->memsize <<= 16;
hc->interface = (tmp & AR_IFACE_MSK);
hc->revision = inb(port + AR_REV);
hc->numports = inb(port + AR_PNUM);
hc->handshake = inb(port + AR_HNDSH);
id->id_msize = ARC_WIN_SIZ;
hc->iobase = id->id_iobase;
hc->mem_start = id->id_maddr;
hc->mem_end = id->id_maddr + id->id_msize;
hc->cunit = id->id_unit;
switch(hc->interface) {
case AR_IFACE_EIA_232:
printf("ar%d: The EIA 232 interface is not supported.\n",
id->id_unit);
return 0;
case AR_IFACE_V_35:
break;
case AR_IFACE_EIA_530:
printf("ar%d: WARNING: The EIA 530 interface is untested.\n",
id->id_unit);
break;
case AR_IFACE_X_21:
break;
case AR_IFACE_COMBO:
printf("ar%d: WARNING: The COMBO interface is untested.\n",
id->id_unit);
break;
}
if(id->id_unit == 0)
hc->startunit = 0;
else
hc->startunit = ar_hardc[id->id_unit - 1].startunit +
ar_hardc[id->id_unit - 1].numports;
/*
* Do a little sanity check.
*/
if((hc->numports > NPORT) || (hc->memsize > (512*1024)))
return 0;
return ARC_IO_SIZ; /* return the amount of IO addresses used. */
}
/*
* Malloc memory for the softc structures.
* Reset the card to put it in a known state.
* Register the ports on the adapter.
* Fill in the info for each port.
* Attach each port to sppp and bpf.
*/
static int
arattach(struct isa_device *id)
{
struct ar_hardc *hc = &ar_hardc[id->id_unit];
struct ar_softc *sc;
struct ifnet *ifp;
int unit;
char *iface;
id->id_ointr = arintr;
switch(hc->interface) {
default: iface = "UNKNOWN"; break;
case AR_IFACE_EIA_232: iface = "EIA-232"; break;
case AR_IFACE_V_35: iface = "EIA-232 or V.35"; break;
case AR_IFACE_EIA_530: iface = "EIA-530"; break;
case AR_IFACE_X_21: iface = "X.21"; break;
case AR_IFACE_COMBO: iface = "COMBO X.21 / EIA-530"; break;
}
printf("arc%d: %uK RAM, %u ports, rev %u, "
"%s interface.\n",
id->id_unit,
hc->memsize/1024,
hc->numports,
hc->revision,
iface);
arc_init(id);
sc = hc->sc;
for(unit=0;unit<hc->numports;unit+=NCHAN)
ar_init_sca(hc, unit / NCHAN);
/*
* Now configure each port on the card.
*/
for(unit=0;unit<hc->numports;sc++,unit++) {
sc->hc = hc;
sc->subunit = unit;
sc->unit = hc->startunit + unit;
sc->scano = unit / NCHAN;
sc->scachan = unit%NCHAN;
ar_init_rx_dmac(sc);
ar_init_tx_dmac(sc);
ar_init_msci(sc);
ifp = &sc->ifsppp.pp_if;
ifp->if_softc = sc;
ifp->if_unit = hc->startunit + unit;
ifp->if_name = "ar";
ifp->if_mtu = PP_MTU;
ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
ifp->if_ioctl = arioctl;
ifp->if_start = arstart;
ifp->if_watchdog = arwatchdog;
sc->ifsppp.pp_flags = PP_KEEPALIVE;
printf("ar%d: Adapter %d, port %d.\n",
sc->unit,
hc->cunit,
sc->subunit);
sppp_attach((struct ifnet *)&sc->ifsppp);
if_attach(ifp);
#if NBPFILTER > 0
bpfattach(ifp, DLT_PPP, PPP_HEADER_LEN);
#endif
}
ARC_SET_OFF(hc->iobase);
return 1;
}
/*
* First figure out which SCA gave the interrupt.
* Process it.
* See if there is other interrupts pending.
* Repeat until there is no more interrupts.
*/
static void
arintr(int unit)
{
struct ar_hardc *hc = &ar_hardc[unit];
sca_regs *sca = hc->sca;
u_char isr0, isr1, isr2, arisr;
int scano;
arisr = inb(hc->iobase + AR_ISTAT);
while(arisr & AR_BD_INT) {
if(arisr & AR_INT_0)
scano = 0;
else if(arisr & AR_INT_1)
scano = 1;
else {
/* XXX Oops this shouldn't happen. */
printf("arc%d: Interrupted with no interrupt.\n", unit);
return;
}
ARC_SET_SCA(hc->iobase, scano);
isr0 = sca->isr0;
isr1 = sca->isr1;
isr2 = sca->isr2;
TRC(printf("arc%d: ARINTR isr0 %x, isr1 %x, isr2 %x\n",
unit,
isr0,
isr1,
isr2));
if(isr0)
ar_msci_intr(hc, scano, isr0);
if(isr1)
ar_dmac_intr(hc, scano, isr1);
if(isr2)
ar_timer_intr(hc, scano, isr2);
/*
* Proccess the second sca's interrupt if available.
* Else see if there are any new interrupts.
*/
if((arisr & AR_INT_0) && (arisr & AR_INT_1))
arisr &= ~AR_INT_0;
else
arisr = inb(hc->iobase + AR_ISTAT);
}
ARC_SET_OFF(hc->iobase);
}
/*
* This will only start the transmitter. It is assumed that the data
* is already there. It is normally called from arstart() or ar_dmac_intr().
*
*/
static void
ar_xmit(struct ar_softc *sc)
{
struct ifnet *ifp = &sc->ifsppp.pp_if;
dmac_channel *dmac = &sc->hc->sca->dmac[DMAC_TXCH(sc->scachan)];
ARC_SET_SCA(sc->hc->iobase, sc->scano);
dmac->cda = (u_short)(sc->block[sc->txb_next_tx].txdesc & 0xffff);
dmac->eda = (u_short)(sc->block[sc->txb_next_tx].txeda & 0xffff);
dmac->dsr = SCA_DSR_DE;
sc->xmit_busy = 1;
sc->txb_next_tx++;
if(sc->txb_next_tx == AR_TX_BLOCKS)
sc->txb_next_tx = 0;
ifp->if_timer = 2; /* Value in seconds. */
ARC_SET_OFF(sc->hc->iobase);
}
/*
* This function will be called from the upper level when a user add a
* packet to be send, and from the interrupt handler after a finished
* transmit.
*
* NOTE: it should run at spl_imp().
*
* This function only place the data in the oncard buffers. It does not
* start the transmition. ar_xmit() does that.
*
* Transmitter idle state is indicated by the IFF_OACTIVE flag. The function
* that clears that should ensure that the transmitter and its DMA is
* in a "good" idle state.
*/
static void
arstart(struct ifnet *ifp)
{
struct ar_softc *sc = ifp->if_softc;
int i, len, tlen;
struct mbuf *mtx;
u_char *txdata;
sca_descriptor *txdesc;
struct buf_block *blkp;
if(!(ifp->if_flags & IFF_RUNNING))
return;
top_arstart:
/*
* See if we have space for more packets.
*/
if(sc->txb_inuse == AR_TX_BLOCKS) {
ifp->if_flags |= IFF_OACTIVE;
return;
}
mtx = sppp_dequeue(ifp);
if(!mtx)
return;
/*
* It is OK to set the memory window outside the loop because
* all tx buffers and descriptors are assumed to be in the same
* 16K window.
*/
ARC_SET_MEM(sc->hc->iobase, sc->block[0].txdesc);
/*
* We stay in this loop until there is nothing in the
* TX queue left or the tx buffer is full.
*/
i = 0;
blkp = &sc->block[sc->txb_new];
txdesc = (sca_descriptor *)
(sc->hc->mem_start + (blkp->txdesc & ARC_WIN_MSK));
txdata = (u_char *)(sc->hc->mem_start + (blkp->txstart & ARC_WIN_MSK));
for(;;) {
len = mtx->m_pkthdr.len;
TRC(printf("ar%d: ARstart len %u\n", sc->unit, len));
/*
* We can do this because the tx buffers don't wrap.
*/
m_copydata(mtx, 0, len, txdata);
tlen = len;
while(tlen > AR_BUF_SIZ) {
txdesc->stat = 0;
txdesc->len = AR_BUF_SIZ;
tlen -= AR_BUF_SIZ;
txdesc++;
txdata += AR_BUF_SIZ;
i++;
}
/* XXX Move into the loop? */
txdesc->stat = SCA_DESC_EOM;
txdesc->len = tlen;
txdesc++;
txdata += AR_BUF_SIZ;
i++;
#if NBPFILTER > 0
if(ifp->if_bpf)
bpf_mtap(ifp, mtx);
#endif
m_freem(mtx);
++sc->ifsppp.pp_if.if_opackets;
/*
* Check if we have space for another mbuf.
* XXX This is hardcoded. A packet won't be larger
* than 3 buffers (3 x 512).
*/
if((i + 3) >= blkp->txmax)
break;
mtx = sppp_dequeue(ifp);
if(!mtx)
break;
}
blkp->txtail = i;
/*
* Mark the last descriptor, so that the SCA know where
* to stop.
*/
txdesc--;
txdesc->stat |= SCA_DESC_EOT;
txdesc = (sca_descriptor *)blkp->txdesc;
blkp->txeda = (u_short)((u_int)&txdesc[i]);
#if 0
printf("ARstart: %p desc->cp %x\n", &txdesc->cp, txdesc->cp);
printf("ARstart: %p desc->bp %x\n", &txdesc->bp, txdesc->bp);
printf("ARstart: %p desc->bpb %x\n", &txdesc->bpb, txdesc->bpb);
printf("ARstart: %p desc->len %x\n", &txdesc->len, txdesc->len);
printf("ARstart: %p desc->stat %x\n", &txdesc->stat, txdesc->stat);
#endif
sc->txb_inuse++;
sc->txb_new++;
if(sc->txb_new == AR_TX_BLOCKS)
sc->txb_new = 0;
if(sc->xmit_busy == 0)
ar_xmit(sc);
ARC_SET_OFF(sc->hc->iobase);
goto top_arstart;
}
static int
arioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
int s, error;
int was_up, should_be_up;
struct sppp *sp = (struct sppp *)ifp;
struct ar_softc *sc = ifp->if_softc;
TRC(printf("ar%d: arioctl.\n", ifp->if_unit);)
was_up = ifp->if_flags & IFF_RUNNING;
error = sppp_ioctl(ifp, cmd, data);
TRC(printf("ar%d: ioctl: ifsppp.pp_flags = %x, if_flags %x.\n",
ifp->if_unit, ((struct sppp *)ifp)->pp_flags, ifp->if_flags);)
if(error)
return error;
if((cmd != SIOCSIFFLAGS) && cmd != (SIOCSIFADDR))
return 0;
TRC(printf("ar%d: arioctl %s.\n", ifp->if_unit,
(cmd == SIOCSIFFLAGS) ? "SIOCSIFFLAGS" : "SIOCSIFADDR");)
s = splimp();
should_be_up = ifp->if_flags & IFF_RUNNING;
if(!was_up && should_be_up) {
/* Interface should be up -- start it. */
ar_up(sc);
arstart(ifp);
/* XXX Maybe clear the IFF_UP flag so that the link
* will only go up after sppp lcp and ipcp negotiation.
*/
} else if(was_up && !should_be_up) {
/* Interface should be down -- stop it. */
ar_down(sc);
sppp_flush(ifp);
}
splx(s);
return 0;
}
/*
* This is to catch lost tx interrupts.
*/
static void
arwatchdog(struct ifnet *ifp)
{
struct ar_softc *sc = ifp->if_softc;
msci_channel *msci = &sc->hc->sca->msci[sc->scachan];
if(!(ifp->if_flags & IFF_RUNNING))
return;
ARC_SET_SCA(sc->hc->iobase, sc->scano);
/* XXX if(sc->ifsppp.pp_if.if_flags & IFF_DEBUG) */
printf("ar%d: transmit failed, "
"ST0 %x, ST1 %x, ST3 %x, DSR %x.\n",
ifp->if_unit,
msci->st0,
msci->st1,
msci->st3,
sc->hc->sca->dmac[DMAC_TXCH(sc->scachan)].dsr);
if(msci->st1 & SCA_ST1_UDRN) {
msci->cmd = SCA_CMD_TXABORT;
msci->cmd = SCA_CMD_TXENABLE;
msci->st1 = SCA_ST1_UDRN;
}
sc->xmit_busy = 0;
ifp->if_flags &= ~IFF_OACTIVE;
if(sc->txb_inuse && --sc->txb_inuse)
ar_xmit(sc);
arstart(ifp);
}
static void
ar_up(struct ar_softc *sc)
{
sca_regs *sca = sc->hc->sca;
msci_channel *msci = &sca->msci[sc->scachan];
TRC(printf("ar%d: sca %p, msci %p, ch %d\n",
sc->unit, sca, msci, sc->scachan));
/*
* Enable transmitter and receiver.
* Raise DTR and RTS.
* Enable interrupts.
*/
ARC_SET_SCA(sc->hc->iobase, sc->scano);
/* XXX
* What about using AUTO mode in msci->md0 ???
* And what about CTS/DCD etc... ?
*/
if(sc->hc->handshake & AR_SHSK_RTS)
msci->ctl &= ~SCA_CTL_RTS;
if(sc->hc->handshake & AR_SHSK_DTR) {
sc->hc->txc_dtr[sc->scano] &= sc->scachan ?
~AR_TXC_DTR_DTR1 : ~AR_TXC_DTR_DTR0;
outb(sc->hc->iobase + sc->hc->txc_dtr_off[sc->scano],
sc->hc->txc_dtr[sc->scano]);
}
if(sc->scachan == 0) {
sca->ier0 |= 0x0F;
sca->ier1 |= 0x0F;
} else {
sca->ier0 |= 0xF0;
sca->ier1 |= 0xF0;
}
msci->cmd = SCA_CMD_RXENABLE;
inb(sc->hc->iobase + AR_ID_5); /* XXX slow it down a bit. */
msci->cmd = SCA_CMD_TXENABLE;
ARC_SET_OFF(sc->hc->iobase);
}
static void
ar_down(struct ar_softc *sc)
{
sca_regs *sca = sc->hc->sca;
msci_channel *msci = &sca->msci[sc->scachan];
/*
* Disable transmitter and receiver.
* Lower DTR and RTS.
* Disable interrupts.
*/
ARC_SET_SCA(sc->hc->iobase, sc->scano);
msci->cmd = SCA_CMD_RXDISABLE;
inb(sc->hc->iobase + AR_ID_5); /* XXX slow it down a bit. */
msci->cmd = SCA_CMD_TXDISABLE;
if(sc->hc->handshake & AR_SHSK_RTS)
msci->ctl |= SCA_CTL_RTS;
if(sc->hc->handshake & AR_SHSK_DTR) {
sc->hc->txc_dtr[sc->scano] |= sc->scachan ?
AR_TXC_DTR_DTR1 : AR_TXC_DTR_DTR0;
outb(sc->hc->iobase + sc->hc->txc_dtr_off[sc->scano],
sc->hc->txc_dtr[sc->scano]);
}
if(sc->scachan == 0) {
sca->ier0 &= ~0x0F;
sca->ier1 &= ~0x0F;
} else {
sca->ier0 &= ~0xF0;
sca->ier1 &= ~0xF0;
}
ARC_SET_OFF(sc->hc->iobase);
}
/*
* Initialize the card, allocate memory for the ar_softc structures
* and fill in the pointers.
*/
static void
arc_init(struct isa_device *id)
{
struct ar_hardc *hc = &ar_hardc[id->id_unit];
struct ar_softc *sc;
int x;
u_int chanmem;
u_int bufmem;
u_int next;
u_int descneeded;
u_char isr, mar;
sc = hc->sc = malloc(hc->numports * sizeof(struct ar_softc),
M_DEVBUF, M_WAITOK);
bzero(sc, hc->numports * sizeof(struct ar_softc));
hc->txc_dtr[0] = AR_TXC_DTR_NOTRESET |
AR_TXC_DTR_DTR0 | AR_TXC_DTR_DTR1;
hc->txc_dtr[1] = AR_TXC_DTR_DTR0 | AR_TXC_DTR_DTR1;
hc->txc_dtr_off[0] = AR_TXC_DTR0;
hc->txc_dtr_off[1] = AR_TXC_DTR2;
/*
* reset the card and wait at least 1uS.
*/
outb(hc->iobase + AR_TXC_DTR0, ~AR_TXC_DTR_NOTRESET & hc->txc_dtr[0]);
DELAY(2);
outb(hc->iobase + AR_TXC_DTR0, hc->txc_dtr[0]);
/*
* Configure the card.
* Mem address, irq,
*/
mar = kvtop(id->id_maddr) >> 16;
isr = irqtable[ffs(id->id_irq) - 1] << 1;
if(isr == 0)
printf("ar%d: Warning illegal interrupt %d\n",
id->id_unit, ffs(id->id_irq) - 1);
isr = isr | ((kvtop(id->id_maddr) & 0xc000) >> 10);
hc->sca = (sca_regs *)hc->mem_start;
outb(hc->iobase + AR_MEM_SEL, mar);
outb(hc->iobase + AR_INT_SEL, isr | AR_INTS_CEN);
/*
* Set the TX clock direction and enable TX.
*/
switch(hc->interface) {
case AR_IFACE_V_35:
hc->txc_dtr[0] |= AR_TXC_DTR_TX0 | AR_TXC_DTR_TX1 |
AR_TXC_DTR_TXCS0 | AR_TXC_DTR_TXCS1;
hc->txc_dtr[1] |= AR_TXC_DTR_TX0 | AR_TXC_DTR_TX1 |
AR_TXC_DTR_TXCS0 | AR_TXC_DTR_TXCS1;
break;
case AR_IFACE_EIA_530:
case AR_IFACE_COMBO:
case AR_IFACE_X_21:
hc->txc_dtr[0] |= AR_TXC_DTR_TX0 | AR_TXC_DTR_TX1;
hc->txc_dtr[1] |= AR_TXC_DTR_TX0 | AR_TXC_DTR_TX1;
}
outb(hc->iobase + AR_TXC_DTR0, hc->txc_dtr[0]);
if(hc->numports > NCHAN)
outb(hc->iobase + AR_TXC_DTR2, hc->txc_dtr[1]);
chanmem = hc->memsize / hc->numports;
next = 0;
for(x=0;x<hc->numports;x++, sc++) {
int blk;
for(blk = 0; blk < AR_TX_BLOCKS; blk++) {
sc->block[blk].txdesc = next;
bufmem = (16 * 1024) / AR_TX_BLOCKS;
descneeded = bufmem / AR_BUF_SIZ;
sc->block[blk].txstart = sc->block[blk].txdesc +
((((descneeded * sizeof(sca_descriptor)) /
AR_BUF_SIZ) + 1) * AR_BUF_SIZ);
sc->block[blk].txend = next + bufmem;
sc->block[blk].txmax =
(sc->block[blk].txend - sc->block[blk].txstart)
/ AR_BUF_SIZ;
next += bufmem;
TRC(printf("ar%d: blk %d: txdesc %x, txstart %x, "
"txend %x, txmax %d\n",
x,
blk,
sc->block[blk].txdesc,
sc->block[blk].txstart,
sc->block[blk].txend,
sc->block[blk].txmax));
}
sc->rxdesc = next;
bufmem = chanmem - (bufmem * AR_TX_BLOCKS);
descneeded = bufmem / AR_BUF_SIZ;
sc->rxstart = sc->rxdesc +
((((descneeded * sizeof(sca_descriptor)) /
AR_BUF_SIZ) + 1) * AR_BUF_SIZ);
sc->rxend = next + bufmem;
sc->rxmax = (sc->rxend - sc->rxstart) / AR_BUF_SIZ;
next += bufmem;
}
}
/*
* The things done here are channel independent.
*
* Configure the sca waitstates.
* Configure the global interrupt registers.
* Enable master dma enable.
*/
static void
ar_init_sca(struct ar_hardc *hc, int scano)
{
sca_regs *sca = hc->sca;
ARC_SET_SCA(hc->iobase, scano);
/*
* Do the wait registers.
* Set everything to 0 wait states.
*/
sca->pabr0 = 0;
sca->pabr1 = 0;
sca->wcrl = 0;
sca->wcrm = 0;
sca->wcrh = 0;
/*
* Configure the interrupt registers.
* Most are cleared until the interface is configured.
*/
sca->ier0 = 0x00; /* MSCI interrupts... Not used with dma. */
sca->ier1 = 0x00; /* DMAC interrupts */
sca->ier2 = 0x00; /* TIMER interrupts... Not used yet. */
sca->itcr = 0x00; /* Use ivr and no intr ack */
sca->ivr = 0x40; /* Fill in the interrupt vector. */
sca->imvr = 0x40;
/*
* Configure the timers.
* XXX Later
*/
/*
* Set the DMA channel priority to rotate between
* all four channels.
*
* Enable all dma channels.
*/
sca->pcr = SCA_PCR_PR2;
sca->dmer = SCA_DMER_EN;
}
/*
* Configure the msci
*
* NOTE: The serial port configuration is hardcoded at the moment.
*/
static void
ar_init_msci(struct ar_softc *sc)
{
msci_channel *msci = &sc->hc->sca->msci[sc->scachan];
ARC_SET_SCA(sc->hc->iobase, sc->scano);
msci->cmd = SCA_CMD_RESET;
msci->md0 = SCA_MD0_CRC_1 |
SCA_MD0_CRC_CCITT |
SCA_MD0_CRC_ENABLE |
SCA_MD0_MODE_HDLC;
msci->md1 = SCA_MD1_NOADDRCHK;
msci->md2 = SCA_MD2_DUPLEX | SCA_MD2_NRZ;
/*
* Acording to the manual I should give a reset after changing the
* mode registers.
*/
msci->cmd = SCA_CMD_RXRESET;
msci->ctl = SCA_CTL_IDLPAT | SCA_CTL_UDRNC | SCA_CTL_RTS;
/*
* For now all interfaces are programmed to use the RX clock for
* the TX clock.
*/
switch(sc->hc->interface) {
case AR_IFACE_V_35:
msci->rxs = SCA_RXS_CLK_RXC0 | SCA_RXS_DIV1;
msci->txs = SCA_TXS_CLK_TXC | SCA_TXS_DIV1;
break;
case AR_IFACE_X_21:
case AR_IFACE_EIA_530:
case AR_IFACE_COMBO:
msci->rxs = SCA_RXS_CLK_RXC0 | SCA_RXS_DIV1;
msci->txs = SCA_TXS_CLK_RX | SCA_TXS_DIV1;
}
msci->tmc = 153; /* This give 64k for loopback */
/* XXX
* Disable all interrupts for now. I think if you are using
* the dmac you don't use these interrupts.
*/
msci->ie0 = 0;
msci->ie1 = 0x0C; /* XXX CTS and DCD (DSR on 570I) level change. */
msci->ie2 = 0;
msci->fie = 0;
msci->sa0 = 0;
msci->sa1 = 0;
msci->idl = 0x7E; /* XXX This is what cisco does. */
/*
* This is what the ARNET diags use.
*/
msci->rrc = 0x0E;
msci->trc0 = 0x12;
msci->trc1 = 0x1F;
}
/*
* Configure the rx dma controller.
*/
static void
ar_init_rx_dmac(struct ar_softc *sc)
{
dmac_channel *dmac = &sc->hc->sca->dmac[DMAC_RXCH(sc->scachan)];
sca_descriptor *rxd;
u_int rxbuf;
u_int rxda;
u_int rxda_d;
ARC_SET_MEM(sc->hc->iobase, sc->rxdesc);
rxd = (sca_descriptor *)(sc->hc->mem_start + (sc->rxdesc&ARC_WIN_MSK));
rxda_d = (u_int)sc->hc->mem_start - (sc->rxdesc & ~ARC_WIN_MSK);
for(rxbuf=sc->rxstart;rxbuf<sc->rxend;rxbuf += AR_BUF_SIZ, rxd++) {
rxda = (u_int)&rxd[1] - rxda_d;
rxd->cp = (u_short)(rxda & 0xfffful);
TRC(printf("Descrp %p, data pt %p, data long %lx, ",
&sc->rxdesc[x], rxinuse->buf, rxbuf));
rxd->bp = (u_short)(rxbuf & 0xfffful);
rxd->bpb = (u_char)((rxbuf >> 16) & 0xff);
rxd->len = 0;
rxd->stat = 0xff; /* The sca write here when it is finished. */
TRC(printf("bpb %x, bp %x.\n", rxd->bpb, rxd->bp));
}
rxd--;
rxd->cp = (u_short)(sc->rxdesc & 0xfffful);
sc->rxhind = 0;
ARC_SET_SCA(sc->hc->iobase, sc->scano);
dmac->dsr = 0; /* Disable DMA transfer */
dmac->dcr = SCA_DCR_ABRT;
/* XXX maybe also SCA_DMR_CNTE */
dmac->dmr = SCA_DMR_TMOD | SCA_DMR_NF;
dmac->bfl = AR_BUF_SIZ;
dmac->cda = (u_short)(sc->rxdesc & 0xffff);
dmac->sarb = (u_char)((sc->rxdesc >> 16) & 0xff);
rxd = (sca_descriptor *)sc->rxstart;
dmac->eda = (u_short)((u_int)&rxd[sc->rxmax - 1] & 0xffff);
dmac->dir = 0xF0;
dmac->dsr = SCA_DSR_DE;
}
/*
* Configure the TX DMA descriptors.
* Initialize the needed values and chain the descriptors.
*/
static void
ar_init_tx_dmac(struct ar_softc *sc)
{
dmac_channel *dmac = &sc->hc->sca->dmac[DMAC_TXCH(sc->scachan)];
struct buf_block *blkp;
int blk;
sca_descriptor *txd;
u_int txbuf;
u_int txda;
u_int txda_d;
ARC_SET_MEM(sc->hc->iobase, sc->block[0].txdesc);
for(blk = 0; blk < AR_TX_BLOCKS; blk++) {
blkp = &sc->block[blk];
txd = (sca_descriptor *)(sc->hc->mem_start +
(blkp->txdesc&ARC_WIN_MSK));
txda_d = (u_int)sc->hc->mem_start -
(blkp->txdesc & ~ARC_WIN_MSK);
txbuf=blkp->txstart;
for(;txbuf<blkp->txend;txbuf += AR_BUF_SIZ, txd++) {
txda = (u_int)&txd[1] - txda_d;
txd->cp = (u_short)(txda & 0xfffful);
txd->bp = (u_short)(txbuf & 0xfffful);
txd->bpb = (u_char)((txbuf >> 16) & 0xff);
TRC(printf("ar%d: txbuf %x, bpb %x, bp %x\n",
sc->unit, txbuf, txd->bpb, txd->bp));
txd->len = 0;
txd->stat = 0;
}
txd--;
txd->cp = (u_short)(blkp->txdesc & 0xfffful);
blkp->txtail = (u_int)txd - (u_int)sc->hc->mem_start;
TRC(printf("TX Descriptors start %x, end %x.\n",
blkp->txhead,
blkp->txtail));
}
ARC_SET_SCA(sc->hc->iobase, sc->scano);
dmac->dsr = 0; /* Disable DMA */
dmac->dcr = SCA_DCR_ABRT;
dmac->dmr = SCA_DMR_TMOD | SCA_DMR_NF;
dmac->dir = SCA_DIR_EOT | SCA_DIR_BOF | SCA_DIR_COF;
dmac->sarb = (u_char)((sc->block[0].txdesc >> 16) & 0xff);
}
/*
* Look through the descriptors to see if there is a complete packet
* available. Stop if we get to where the sca is busy.
*
* Return the length and status of the packet.
* Return nonzero if there is a packet available.
*
* NOTE:
* It seems that we get the interrupt a bit early. The updateing of
* descriptor values is not always completed when this is called.
*/
static int
ar_packet_avail(struct ar_softc *sc,
int *len,
u_char *rxstat)
{
sca_descriptor *rxdesc;
sca_descriptor *endp;
sca_descriptor *cda;
ARC_SET_SCA(sc->hc->iobase, sc->scano);
cda = (sca_descriptor *)(sc->hc->mem_start +
(sc->hc->sca->dmac[DMAC_RXCH(sc->scachan)].cda & ARC_WIN_MSK));
ARC_SET_MEM(sc->hc->iobase, sc->rxdesc);
rxdesc = (sca_descriptor *)
(sc->hc->mem_start + (sc->rxdesc & ARC_WIN_MSK));
endp = rxdesc;
rxdesc = &rxdesc[sc->rxhind];
endp = &endp[sc->rxmax];
*len = 0;
while(rxdesc != cda) {
*len += rxdesc->len;
if(rxdesc->stat & SCA_DESC_EOM) {
*rxstat = rxdesc->stat;
TRC(printf("ar%d: PKT AVAIL len %d, %x, bufs %u.\n",
sc->unit, *len, *rxstat, x));
return 1;
}
rxdesc++;
if(rxdesc == endp)
rxdesc = (sca_descriptor *)
(sc->hc->mem_start + (sc->rxdesc & ARC_WIN_MSK));
}
*len = 0;
*rxstat = 0;
return 0;
}
/*
* Copy a packet from the on card memory into a provided mbuf.
* Take into account that buffers wrap and that a packet may
* be larger than a buffer.
*/
static void
ar_copy_rxbuf(struct mbuf *m,
struct ar_softc *sc,
int len)
{
sca_descriptor *rxdesc;
u_int rxdata;
u_int rxmax;
u_int off = 0;
u_int tlen;
rxdata = sc->rxstart + (sc->rxhind * AR_BUF_SIZ);
rxmax = sc->rxstart + (sc->rxmax * AR_BUF_SIZ);
rxdesc = (sca_descriptor *)
(sc->hc->mem_start + (sc->rxdesc & ARC_WIN_MSK));
rxdesc = &rxdesc[sc->rxhind];
while(len) {
tlen = (len < AR_BUF_SIZ) ? len : AR_BUF_SIZ;
ARC_SET_MEM(sc->hc->iobase, rxdata);
bcopy(sc->hc->mem_start + (rxdata & ARC_WIN_MSK),
mtod(m, caddr_t) + off,
tlen);
off += tlen;
len -= tlen;
ARC_SET_MEM(sc->hc->iobase, sc->rxdesc);
rxdesc->len = 0;
rxdesc->stat = 0xff;
rxdata += AR_BUF_SIZ;
rxdesc++;
if(rxdata == rxmax) {
rxdata = sc->rxstart;
rxdesc = (sca_descriptor *)
(sc->hc->mem_start + (sc->rxdesc & ARC_WIN_MSK));
}
}
}
/*
* If single is set, just eat a packet. Otherwise eat everything up to
* where cda points. Update pointers to point to the next packet.
*/
static void
ar_eat_packet(struct ar_softc *sc, int single)
{
sca_descriptor *rxdesc;
sca_descriptor *endp;
sca_descriptor *cda;
int loopcnt = 0;
u_char stat;
ARC_SET_SCA(sc->hc->iobase, sc->scano);
cda = (sca_descriptor *)(sc->hc->mem_start +
(sc->hc->sca->dmac[DMAC_RXCH(sc->scachan)].cda & ARC_WIN_MSK));
/*
* Loop until desc->stat == (0xff || EOM)
* Clear the status and length in the descriptor.
* Increment the descriptor.
*/
ARC_SET_MEM(sc->hc->iobase, sc->rxdesc);
rxdesc = (sca_descriptor *)
(sc->hc->mem_start + (sc->rxdesc & ARC_WIN_MSK));
endp = rxdesc;
rxdesc = &rxdesc[sc->rxhind];
endp = &endp[sc->rxmax];
while(rxdesc != cda) {
loopcnt++;
if(loopcnt > sc->rxmax) {
printf("ar%d: eat pkt %d loop, cda %p, "
"rxdesc %p, stat %x.\n",
sc->unit,
loopcnt,
(void *)cda,
(void *)rxdesc,
rxdesc->stat);
break;
}
stat = rxdesc->stat;
rxdesc->len = 0;
rxdesc->stat = 0xff;
rxdesc++;
sc->rxhind++;
if(rxdesc == endp) {
rxdesc = (sca_descriptor *)
(sc->hc->mem_start + (sc->rxdesc & ARC_WIN_MSK));
sc->rxhind = 0;
}
if(single && (stat == SCA_DESC_EOM))
break;
}
/*
* Update the eda to the previous descriptor.
*/
ARC_SET_SCA(sc->hc->iobase, sc->scano);
rxdesc = (sca_descriptor *)sc->rxdesc;
rxdesc = &rxdesc[(sc->rxhind + sc->rxmax - 2 ) % sc->rxmax];
sc->hc->sca->dmac[DMAC_RXCH(sc->scachan)].eda =
(u_short)((u_int)rxdesc & 0xffff);
}
/*
* While there is packets available in the rx buffer, read them out
* into mbufs and ship them off.
*/
static void
ar_get_packets(struct ar_softc *sc)
{
sca_descriptor *rxdesc;
struct mbuf *m = NULL;
int i;
int len;
u_char rxstat;
while(ar_packet_avail(sc, &len, &rxstat)) {
if(((rxstat & SCA_DESC_ERRORS) == 0) && (len < MCLBYTES)) {
MGETHDR(m, M_DONTWAIT, MT_DATA);
if(m == NULL) {
/* eat packet if get mbuf fail!! */
ar_eat_packet(sc, 1);
continue;
}
m->m_pkthdr.rcvif = &sc->ifsppp.pp_if;
m->m_pkthdr.len = m->m_len = len;
if(len > MHLEN) {
MCLGET(m, M_DONTWAIT);
if((m->m_flags & M_EXT) == 0) {
m_freem(m);
ar_eat_packet(sc, 1);
continue;
}
}
ar_copy_rxbuf(m, sc, len);
#if NBPFILTER > 0
if(sc->ifsppp.pp_if.if_bpf)
bpf_mtap(&sc->ifsppp.pp_if, m);
#endif
sppp_input(&sc->ifsppp.pp_if, m);
sc->ifsppp.pp_if.if_ipackets++;
/*
* Update the eda to the previous descriptor.
*/
i = (len + AR_BUF_SIZ - 1) / AR_BUF_SIZ;
sc->rxhind = (sc->rxhind + i) % sc->rxmax;
ARC_SET_SCA(sc->hc->iobase, sc->scano);
rxdesc = (sca_descriptor *)sc->rxdesc;
rxdesc =
&rxdesc[(sc->rxhind + sc->rxmax - 2 ) % sc->rxmax];
sc->hc->sca->dmac[DMAC_RXCH(sc->scachan)].eda =
(u_short)((u_int)rxdesc & 0xffff);
} else {
int tries = 5;
while((rxstat == 0xff) && --tries)
ar_packet_avail(sc, &len, &rxstat);
/*
* It look like we get an interrupt early
* sometimes and then the status is not
* filled in yet.
*/
if(tries && (tries != 5))
continue;
ar_eat_packet(sc, 1);
sc->ifsppp.pp_if.if_ierrors++;
ARC_SET_SCA(sc->hc->iobase, sc->scano);
TRCL(printf("ar%d: Receive error chan %d, "
"stat %x, msci st3 %x,"
"rxhind %d, cda %x, eda %x.\n",
sc->unit,
sc->scachan,
rxstat,
sc->hc->sca->msci[sc->scachan].st3,
sc->rxhind,
sc->hc->sca->dmac[
DMAC_RXCH(sc->scachan)].cda,
sc->hc->sca->dmac[
DMAC_RXCH(sc->scachan)].eda));
}
}
}
/*
* All DMA interrupts come here.
*
* Each channel has two interrupts.
* Interrupt A for errors and Interrupt B for normal stuff like end
* of transmit or receive dmas.
*/
static void
ar_dmac_intr(struct ar_hardc *hc, int scano, u_char isr1)
{
u_char dsr;
u_char dotxstart = isr1;
int mch;
struct ar_softc *sc;
sca_regs *sca = hc->sca;
dmac_channel *dmac;
mch = 0;
/*
* Shortcut if there is no interrupts for dma channel 0 or 1
*/
if((isr1 & 0x0F) == 0) {
mch = 1;
isr1 >>= 4;
}
do {
sc = &hc->sc[mch + (NCHAN * scano)];
/*
* Transmit channel
*/
if(isr1 & 0x0C) {
dmac = &sca->dmac[DMAC_TXCH(mch)];
ARC_SET_SCA(hc->iobase, scano);
dsr = dmac->dsr;
dmac->dsr = dsr;
/* Counter overflow */
if(dsr & SCA_DSR_COF) {
printf("ar%d: TX DMA Counter overflow, "
"txpacket no %lu.\n",
sc->unit,
sc->ifsppp.pp_if.if_opackets);
sc->ifsppp.pp_if.if_oerrors++;
}
/* Buffer overflow */
if(dsr & SCA_DSR_BOF) {
printf("ar%d: TX DMA Buffer overflow, "
"txpacket no %lu, dsr %02x, "
"cda %04x, eda %04x.\n",
sc->unit,
sc->ifsppp.pp_if.if_opackets,
dsr,
dmac->cda,
dmac->eda);
sc->ifsppp.pp_if.if_oerrors++;
}
/* End of Transfer */
if(dsr & SCA_DSR_EOT) {
/*
* This should be the most common case.
*
* Clear the IFF_OACTIVE flag.
*
* Call arstart to start a new transmit if
* there is data to transmit.
*/
sc->xmit_busy = 0;
sc->ifsppp.pp_if.if_flags &= ~IFF_OACTIVE;
sc->ifsppp.pp_if.if_timer = 0;
if(sc->txb_inuse && --sc->txb_inuse)
ar_xmit(sc);
}
}
/*
* Receive channel
*/
if(isr1 & 0x03) {
dmac = &sca->dmac[DMAC_RXCH(mch)];
ARC_SET_SCA(hc->iobase, scano);
dsr = dmac->dsr;
dmac->dsr = dsr;
TRC(printf("AR: RX DSR %x\n", dsr));
/* End of frame */
if(dsr & SCA_DSR_EOM) {
TRC(int tt = sc->ifsppp.pp_if.if_ipackets;)
TRC(int ind = sc->rxhind;)
ar_get_packets(sc);
TRC(
if(tt == sc->ifsppp.pp_if.if_ipackets) {
sca_descriptor *rxdesc;
int i;
ARC_SET_SCA(hc->iobase, scano);
printf("AR: RXINTR isr1 %x, dsr %x, "
"no data %d pkts, orxhind %d.\n",
dotxstart,
dsr,
tt,
ind);
printf("AR: rxdesc %x, rxstart %x, "
"rxend %x, rxhind %d, "
"rxmax %d.\n",
sc->rxdesc,
sc->rxstart,
sc->rxend,
sc->rxhind,
sc->rxmax);
printf("AR: cda %x, eda %x.\n",
dmac->cda,
dmac->eda);
ARC_SET_MEM(sc->hc->iobase, sc->rxdesc);
rxdesc = (sca_descriptor *)
(sc->hc->mem_start +
(sc->rxdesc & ARC_WIN_MSK));
rxdesc = &rxdesc[sc->rxhind];
for(i=0;i<3;i++,rxdesc++)
printf("AR: rxdesc->stat %x, "
"len %d.\n",
rxdesc->stat,
rxdesc->len);
})
}
/* Counter overflow */
if(dsr & SCA_DSR_COF) {
printf("ar%d: RX DMA Counter overflow, "
"rxpkts %lu.\n",
sc->unit,
sc->ifsppp.pp_if.if_ipackets);
sc->ifsppp.pp_if.if_ierrors++;
}
/* Buffer overflow */
if(dsr & SCA_DSR_BOF) {
ARC_SET_SCA(hc->iobase, scano);
printf("ar%d: RX DMA Buffer overflow, "
"rxpkts %lu, rxind %d, "
"cda %x, eda %x, dsr %x.\n",
sc->unit,
sc->ifsppp.pp_if.if_ipackets,
sc->rxhind,
dmac->cda,
dmac->eda,
dsr);
/*
* Make sure we eat as many as possible.
* Then get the system running again.
*/
ar_eat_packet(sc, 0);
sc->ifsppp.pp_if.if_ierrors++;
ARC_SET_SCA(hc->iobase, scano);
sca->msci[mch].cmd = SCA_CMD_RXMSGREJ;
dmac->dsr = SCA_DSR_DE;
TRC(printf("ar%d: RX DMA Buffer overflow, "
"rxpkts %lu, rxind %d, "
"cda %x, eda %x, dsr %x. After\n",
sc->unit,
sc->ifsppp.pp_if.if_ipackets,
sc->rxhind,
dmac->cda,
dmac->eda,
dmac->dsr);)
}
/* End of Transfer */
if(dsr & SCA_DSR_EOT) {
/*
* If this happen, it means that we are
* receiving faster than what the processor
* can handle.
*
* XXX We should enable the dma again.
*/
printf("ar%d: RX End of transfer, rxpkts %lu.\n",
sc->unit,
sc->ifsppp.pp_if.if_ipackets);
sc->ifsppp.pp_if.if_ierrors++;
}
}
isr1 >>= 4;
mch++;
}while((mch<NCHAN) && isr1);
/*
* Now that we have done all the urgent things, see if we
* can fill the transmit buffers.
*/
for(mch = 0; mch < NCHAN; mch++) {
if(dotxstart & 0x0C) {
sc = &hc->sc[mch + (NCHAN * scano)];
arstart(&sc->ifsppp.pp_if);
}
dotxstart >>= 4;
}
}
static void
ar_msci_intr(struct ar_hardc *hc, int scano, u_char isr0)
{
printf("arc%d: ARINTR: MSCI\n", hc->cunit);
}
static void
ar_timer_intr(struct ar_hardc *hc, int scano, u_char isr2)
{
printf("arc%d: ARINTR: TIMER\n", hc->cunit);
}
/*
********************************* END ************************************
*/
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