BSD 4_3_Net_1 release

[unix-history] / sys / vaxif / if_acc.c

/*
* Copyright (c) 1982, 1986, 1988 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley.  The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
*      @(#)if_acc.c    7.5 (Berkeley) 6/29/88
*/

#include "acc.h"
#if NACC > 0

/*
* ACC LH/DH ARPAnet IMP interface driver.
*/
#include "../machine/pte.h"

#include "param.h"
#include "systm.h"
#include "mbuf.h"
#include "buf.h"
#include "protosw.h"
#include "socket.h"
#include "vmmac.h"

#include "../net/if.h"
#include "../netimp/if_imp.h"

#include "../vax/cpu.h"
#include "../vax/mtpr.h"
#include "if_accreg.h"
#include "if_uba.h"
#include "../vaxuba/ubareg.h"
#include "../vaxuba/ubavar.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 };

int     accinit(), accoutput(), accdown(), 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  imp_softc *acc_imp;     /* 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;
{
       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;
       return (1);
}

/*
* 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)
       register struct uba_device *ui;
{
       register struct acc_softc *sc = &acc_softc[ui->ui_unit];
       register struct impcb *ip;

       if ((sc->acc_imp = impattach(ui->ui_driver->ud_dname, ui->ui_unit,
           accreset)) == 0)
               return;
       ip = &sc->acc_imp->imp_cb;
       ip->ic_init = accinit;
       ip->ic_output = accoutput;
       ip->ic_down = accdown;
       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];
       sc->acc_imp->imp_if.if_flags &= ~IFF_RUNNING;
       accoflush(unit);
       /* must go through IMP to allow it to set state */
       (*sc->acc_imp->imp_if.if_init)(sc->acc_imp->imp_if.if_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;
       int info;

       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 ((sc->acc_imp->imp_if.if_flags & IFF_RUNNING) == 0 &&
           if_ubainit(&sc->acc_ifuba, ui->ui_ubanum, 0,
            (int)btoc(IMP_RCVBUF)) == 0) {
               printf("acc%d: can't initialize\n", unit);
               sc->acc_imp->imp_if.if_flags &= ~(IFF_UP | IFF_RUNNING);
               return (0);
       }
       sc->acc_imp->imp_if.if_flags |= IFF_RUNNING;
       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: IMP_RCVBUF includes the leader.
        */
       info = sc->acc_ifuba.ifu_r.ifrw_info;
       addr->iba = (u_short)info;
       addr->iwc = -((IMP_RCVBUF) >> 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);
}

/*
* Drop the host ready line to mark host down.
*/
accdown(unit)
       int unit;
{
       register struct accdevice *addr;

       addr = (struct accdevice *)(accinfo[unit]->ui_addr);
       addr->ocsr = ACC_RESET;
       DELAY(5000);
       addr->ocsr = OUT_BBACK;         /* reset host master ready */
       accoflush(unit);
       return (1);
}

accoflush(unit)
       int unit;
{
       register struct acc_softc *sc = &acc_softc[unit];

       sc->acc_imp->imp_cb.ic_oactive = 0;
       if (sc->acc_ifuba.ifu_xtofree) {
               m_freem(sc->acc_ifuba.ifu_xtofree);
               sc->acc_ifuba.ifu_xtofree = 0;
       }
}

/*
* Start output on an interface.
*/
accoutput(unit, m)
       int unit;
       struct mbuf *m;
{
       int info;
       register struct acc_softc *sc = &acc_softc[unit];
       register struct accdevice *addr;
       u_short cmd;

       sc->acc_olen = if_wubaput(&sc->acc_ifuba, m);
       /*
        * 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_imp->imp_cb.ic_oactive = 1;
}

/*
* Output interrupt handler.
*/
accxint(unit)
       int unit;
{
       register struct acc_softc *sc = &acc_softc[unit];
       register struct accdevice *addr;

       addr = (struct accdevice *)accinfo[unit]->ui_addr;
       if (sc->acc_imp->imp_cb.ic_oactive == 0) {
               printf("acc%d: stray xmit interrupt, csr=%b\n", unit,
                       addr->ocsr, ACC_OUTBITS);
               return;
       }
       sc->acc_imp->imp_if.if_opackets++;
       sc->acc_imp->imp_cb.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_imp->imp_if.if_oerrors++;
       }
       if (sc->acc_ifuba.ifu_xtofree) {
               m_freem(sc->acc_ifuba.ifu_xtofree);
               sc->acc_ifuba.ifu_xtofree = 0;
       }
       impstart(sc->acc_imp);
}

/*
* Input interrupt handler
*/
accrint(unit)
       int unit;
{
       register struct acc_softc *sc = &acc_softc[unit];
       register struct accdevice *addr;
       struct mbuf *m;
       int len, info;

       addr = (struct accdevice *)accinfo[unit]->ui_addr;
       sc->acc_imp->imp_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);
       if (addr->icsr & ACC_ERR) {
               printf("acc%d: input error, csr=%b\n", unit,
                   addr->icsr, ACC_INBITS);
               sc->acc_imp->imp_if.if_ierrors++;
               sc->acc_flush = 1;
       }

       if (sc->acc_flush) {
               if (addr->icsr & IN_EOM)
                       sc->acc_flush = 0;
               goto setup;
       }
       len = IMP_RCVBUF + (addr->iwc << 1);
       if (len < 0 || len > IMP_RCVBUF) {
               printf("acc%d: bad length=%d\n", unit, len);
               sc->acc_imp->imp_if.if_ierrors++;
               goto setup;
       }

       /*
        * The offset parameter is always 0 since using
        * trailers on the ARPAnet is insane.
        */
       m = if_rubaget(&sc->acc_ifuba, len, 0, &sc->acc_imp->imp_if);
       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 = -((IMP_RCVBUF)>> 1);
       addr->icsr =
               IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO;
}
#endif