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freebsd/sys/i386/isa/if_ar.c
Joerg Wunsch 00081cc989 Major overhaul of the SyncPPP layer. Basically, this comprises now a 
full implementation of the sate machine as described in RFC1661, and
provides support for plugging in various control protocols.  I needed
this to provide PPP support for the BISDN project (right now).

Unfortunatley, while the existing API was almost up to the point, i
needed one minor API change in order to decouple the this-layer-
started and this-layer-finished actions from the respective Up and
Down events of the lower layer.  This requires two additional lines in
the attach routines of all existing lower layer interface drivers that
are using syncPPP (shortcutting these actions and events).  Apart from
this, i believe i didn't change the API of all this, so everything
should plug in without too many hassles.  Please report if i broke
something in the existing drivers.

For a list of features (including new ones like dial-on-demand), and
things still to be done, please refer to the man page i'll commit asap.

Encouraged by:	Serge Vakulenko <vak@cronyx.ru>
1997-05-19 22:03:09 +00:00

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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 1.14 1997/02/22 09:36:15 peter 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/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 "ioconf.h"
#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 void ar_xmit(struct ar_softc *sc);
static void arstart(struct ifnet *ifp);
static int arioctl(struct ifnet *ifp, int 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;
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);
/*
* Shortcut the sppp tls/tlf actions to up/down events
* since our lower layer is always ready.
*/
sc->ifsppp.pp_tls = sc->ifsppp.pp_up;
sc->ifsppp.pp_tlf = sc->ifsppp.pp_down;
#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.
*/
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 it's 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, int 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);)
if(cmd == SIOCSIFFLAGS) {
if(ifp->if_flags & IFF_LINK2)
sp->pp_flags |= PP_CISCO;
else
sp->pp_flags &= ~PP_CISCO;
}
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 %x, "
"rxdesc %x, stat %x.\n",
sc->unit,
loopcnt,
cda,
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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