2.9BSD/usr/net/sys/net/if_acc.c
/* if_acc.c 4.19 82/06/20 */
#include "acc.h"
#ifdef NACC > 0
/*
* ACC LH/DH ARPAnet IMP interface driver.
* Define "PLI" if connected to a PLI, to take care of PLI ready-line problems
*/
#include "param.h"
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/buf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/ubavar.h>
#include "../net/in.h"
#include "../net/in_systm.h"
#include "../net/if.h"
#include "../net/if_acc.h"
#include "../net/if_imp.h"
#include "../net/if_uba.h"
int accprobe(), accattach(), accrint(), accxint();
struct uba_device *accinfo[NACC];
u_short accstd[] = { 0 };
struct uba_driver accdriver =
{ accprobe, 0, accattach, 0, accstd, "acc", accinfo };
#define ACCUNIT(x) minor(x)
int accinit(), accstart(), accreset();
/*
* "Lower half" of IMP interface driver.
*
* Each IMP interface is handled by a common module which handles
* the IMP-host protocol and a hardware driver which manages the
* hardware specific details of talking with the IMP.
*
* The hardware portion of the IMP driver handles DMA and related
* management of UNIBUS resources. The IMP protocol module interprets
* contents of these messages and "controls" the actions of the
* hardware module during IMP resets, but not, for instance, during
* UNIBUS resets.
*
* The two modules are coupled at "attach time", and ever after,
* through the imp interface structure. Higher level protocols,
* e.g. IP, interact with the IMP driver, rather than the ACC.
*/
struct acc_softc {
struct ifnet *acc_if; /* pointer to IMP's ifnet struct */
struct impcb *acc_ic; /* data structure shared with IMP */
struct ifuba acc_ifuba; /* UNIBUS resources */
struct mbuf *acc_iq; /* input reassembly queue */
short acc_olen; /* size of last message sent */
char acc_flush; /* flush remainder of message */
} acc_softc[NACC];
/*
* Reset the IMP and cause a transmitter interrupt by
* performing a null DMA.
*/
accprobe(reg)
caddr_t reg;
{
#if !pdp11
register int br, cvec; /* r11, r10 value-result */
register struct accdevice *addr = (struct accdevice *)reg;
#ifdef lint
br = 0; cvec = br; br = cvec;
accrint(0); accxint(0);
#endif
addr->icsr = ACC_RESET; DELAY(5000);
addr->ocsr = ACC_RESET; DELAY(5000);
addr->ocsr = OUT_BBACK; DELAY(5000);
addr->owc = 0;
addr->ocsr = ACC_IE | ACC_GO; DELAY(5000);
addr->ocsr = 0;
if (cvec && cvec != 0x200) /* transmit -> receive */
cvec -= 4;
#ifdef ECHACK
br = 0x16;
#endif
return (1);
#endif !pdp11
}
/*
* Call the IMP module to allow it to set up its internal
* state, then tie the two modules together by setting up
* the back pointers to common data structures.
*/
accattach(ui)
struct uba_device *ui;
{
register struct acc_softc *sc = &acc_softc[ui->ui_unit];
register struct impcb *ip;
struct ifimpcb {
struct ifnet ifimp_if;
struct impcb ifimp_impcb;
} *ifimp;
if ((ifimp = (struct ifimpcb *)impattach(ui)) == 0)
panic("accattach");
sc->acc_if = &ifimp->ifimp_if;
ip = &ifimp->ifimp_impcb;
sc->acc_ic = ip;
ip->ic_init = accinit;
ip->ic_start = accstart;
sc->acc_ifuba.ifu_flags = UBA_CANTWAIT;
#ifdef notdef
sc->acc_ifuba.ifu_flags |= UBA_NEEDBDP;
#endif
}
/*
* Reset interface after UNIBUS reset.
* If interface is on specified uba, reset its state.
*/
accreset(unit, uban)
int unit, uban;
{
register struct uba_device *ui;
struct acc_softc *sc;
if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0 ||
ui->ui_ubanum != uban)
return;
printf(" acc%d", unit);
sc = &acc_softc[unit];
/* must go through IMP to allow it to set state */
(*sc->acc_if->if_init)(unit);
}
/*
* Initialize interface: clear recorded pending operations,
* and retrieve, and initialize UNIBUS resources. Note
* return value is used by IMP init routine to mark IMP
* unavailable for outgoing traffic.
*/
accinit(unit)
int unit;
{
register struct acc_softc *sc;
register struct uba_device *ui;
register struct accdevice *addr;
long info;
int i;
if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0) {
printf("acc%d: not alive\n", unit);
return (0);
}
sc = &acc_softc[unit];
/*
* Header length is 0 since we have to passs
* the IMP leader up to the protocol interpretation
* routines. If we had the header length as
* sizeof(struct imp_leader), then the if_ routines
* would asssume we handle it on input and output.
*/
if (if_ubainit(&sc->acc_ifuba, ui->ui_ubanum, 0,
(int)btoc(IMPMTU)) == 0) {
printf("acc%d: can't initialize\n", unit);
ui->ui_alive = 0;
return (0);
}
addr = (struct accdevice *)ui->ui_addr;
/*
* Reset the imp interface;
* the delays are pure guesswork.
*/
addr->ocsr = ACC_RESET; DELAY(5000);
addr->ocsr = OUT_BBACK; DELAY(5000); /* reset host master ready */
addr->ocsr = 0;
if (accinputreset(addr, unit) == 0) {
ui->ui_alive = 0;
return (0);
}
/*
* Put up a read. We can't restart any outstanding writes
* until we're back in synch with the IMP (i.e. we've flushed
* the NOOPs it throws at us).
* Note: IMPMTU includes the leader.
*/
info = sc->acc_ifuba.ifu_r.ifrw_info;
addr->iba = (u_short)info;
addr->iwc = -(IMPMTU >> 1);
#ifdef LOOPBACK
addr->ocsr |= OUT_BBACK;
#endif
addr->icsr =
IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO;
return (1);
}
accinputreset(addr, unit)
register struct accdevice *addr;
register int unit;
{
register int i;
addr->icsr = ACC_RESET; DELAY(5000);
addr->icsr = IN_MRDY | IN_WEN; /* close the relay */
DELAY(10000);
/* YECH!!! */
for (i = 0; i < 500; i++) {
if ((addr->icsr & IN_HRDY) ||
(addr->icsr & (IN_RMR | IN_IMPBSY)) == 0)
return (1);
addr->icsr = IN_MRDY | IN_WEN; DELAY(10000);
/* keep turning IN_RMR off */
}
printf("acc%d: imp doesn't respond, icsr=%b\n", unit,
addr->icsr, ACC_INBITS);
return (0);
}
/*
* Start output on an interface.
*/
accstart(dev)
dev_t dev;
{
int unit = ACCUNIT(dev);
long info;
register struct acc_softc *sc = &acc_softc[unit];
register struct accdevice *addr;
struct mbuf *m;
u_short cmd;
if (sc->acc_ic->ic_oactive)
goto restart;
/*
* Not already active, deqeue a request and
* map it onto the UNIBUS. If no more
* requeusts, just return.
*/
IF_DEQUEUE(&sc->acc_if->if_snd, m);
if (m == 0) {
sc->acc_ic->ic_oactive = 0;
return;
}
sc->acc_olen = if_wubaput(&sc->acc_ifuba, m);
restart:
/*
* Have request mapped to UNIBUS for
* transmission; start the output.
*/
if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP)
UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_w.ifrw_bdp);
addr = (struct accdevice *)accinfo[unit]->ui_addr;
info = sc->acc_ifuba.ifu_w.ifrw_info;
addr->oba = (u_short)info;
addr->owc = -((sc->acc_olen + 1) >> 1);
cmd = ACC_IE | OUT_ENLB | ((info & 0x30000) >> 12) | ACC_GO;
#ifdef LOOPBACK
cmd |= OUT_BBACK;
#endif
addr->ocsr = cmd;
sc->acc_ic->ic_oactive = 1;
}
/*
* Output interrupt handler.
*/
accxint(unit)
{
register struct acc_softc *sc = &acc_softc[unit];
register struct accdevice *addr;
MAPSAVE();
addr = (struct accdevice *)accinfo[unit]->ui_addr;
if (sc->acc_ic->ic_oactive == 0) {
printf("acc%d: stray xmit interrupt, csr=%b\n", unit,
addr->ocsr, ACC_OUTBITS);
goto out;
}
sc->acc_if->if_opackets++;
sc->acc_ic->ic_oactive = 0;
if (addr->ocsr & ACC_ERR) {
printf("acc%d: output error, ocsr=%b, icsr=%b\n", unit,
addr->ocsr, ACC_OUTBITS, addr->icsr, ACC_INBITS);
sc->acc_if->if_oerrors++;
}
if (sc->acc_ifuba.ifu_xtofree) {
m_freem(sc->acc_ifuba.ifu_xtofree);
sc->acc_ifuba.ifu_xtofree = 0;
}
if (sc->acc_if->if_snd.ifq_head)
accstart(unit);
out:
MAPREST();
}
/*
* Input interrupt handler
*/
accrint(unit)
{
register struct acc_softc *sc = &acc_softc[unit];
register struct accdevice *addr;
struct mbuf *m;
int len;
long info;
MAPSAVE();
addr = (struct accdevice *)accinfo[unit]->ui_addr;
sc->acc_if->if_ipackets++;
/*
* Purge BDP; flush message if error indicated.
*/
if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP)
UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_r.ifrw_bdp);
#ifndef PLI
if (addr->icsr & ACC_ERR) {
#else
if (addr->icsr & (ACC_ERR|IN_RMR)) {
#endif PLI
printf("acc%d: input error, csr=%b\n", unit,
addr->icsr, ACC_INBITS);
sc->acc_if->if_ierrors++;
sc->acc_flush = 1;
if(addr->icsr & IN_IMPBSY
#ifdef PLI
|| ((addr->icsr&IN_RMR) && (addr->icsr&IN_HRDY))
#endif PLI
){ /* IMP ready line dropped */
impinput(unit, (struct mbuf *)0);
goto out; /* Do NOT re-enable interrupts!!! */
}
}
if (sc->acc_flush) {
if (addr->icsr & IN_EOM)
sc->acc_flush = 0;
goto setup;
}
len = IMPMTU + (addr->iwc << 1);
if (len < 0 || len > IMPMTU) {
printf("acc%d: bad length=%d\n", len);
sc->acc_if->if_ierrors++;
goto setup;
}
/*
* The last parameter is always 0 since using
* trailers on the ARPAnet is insane.
*/
m = if_rubaget(&sc->acc_ifuba, len, 0);
if (m == 0)
goto setup;
if ((addr->icsr & IN_EOM) == 0) {
if (sc->acc_iq)
m_cat(sc->acc_iq, m);
else
sc->acc_iq = m;
goto setup;
}
if (sc->acc_iq) {
m_cat(sc->acc_iq, m);
m = sc->acc_iq;
sc->acc_iq = 0;
}
impinput(unit, m);
setup:
/*
* Setup for next message.
*/
info = sc->acc_ifuba.ifu_r.ifrw_info;
addr->iba = (u_short)info;
addr->iwc = -(IMPMTU >> 1);
addr->icsr =
IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO;
out:
MAPREST();
}
#endif