[unix-history] / usr / src / sys / vax / if / if_css.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 this notice is preserved and that due credit is given
 * to the University of California at 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'' without express or implied warranty.
 *
 *	@(#)if_css.c	7.5 (Berkeley) %G%
 */

#include "css.h"
#if NCSS > 0

/*
 * DEC/CSS IMP11-A ARPAnet IMP interface driver.
 * Since "imp11a" is such a mouthful, it is called
 * "css" after the LH/DH being called "acc".
 *
 * Configuration notes:
 *
 * As delivered from DEC/CSS, it
 * is addressed and vectored as two DR11-B's.  This makes
 * Autoconfig almost IMPOSSIBLE.  To make it work, the
 * interrupt vectors must be restrapped to make the vectors
 * consecutive.  The 020 hole between the CSR addresses is
 * tolerated, althought that could be cleaned-up also.
 *
 * Additionally, the TRANSMIT side of the IMP11-A has the
 * lower address of the two subunits, so the vector ordering
 * in the CONFIG file is reversed from most other devices.
 * It should be:
 *
 * device css0 ....  cssxint cssrint
 *
 * If you get it wrong, it will still autoconfig, but will just
 * sit there with RECEIVE IDLE indicated on the front panel.
 */
#include "param.h"
#include "systm.h"
#include "mbuf.h"
#include "buf.h"
#include "protosw.h"
#include "socket.h"
#include "vmmac.h"

#include "../machine/pte.h"

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

#include "../vax/cpu.h"
#include "../vax/mtpr.h"
#include "if_cssreg.h"
#include "if_uba.h"
#include "../vaxuba/ubareg.h"
#include "../vaxuba/ubavar.h"

int     cssprobe(), cssattach(), cssrint(), cssxint();
struct  uba_device *cssinfo[NCSS];
u_short cssstd[] = { 0 };
struct  uba_driver cssdriver =
        { cssprobe, 0, cssattach, 0, cssstd, "css", cssinfo };

int     cssinit(), cssoutput(), cssdown(), cssreset();

/*
 * "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 CSS.
 */
struct  css_softc {
	struct	imp_softc *css_imp;	/* pointer to IMP's imp_softc struct */
	struct	ifuba css_ifuba;	/* UNIBUS resources */
	struct	mbuf *css_iq;		/* input reassembly queue */
	short	css_olen;		/* size of last message sent */
	char	css_flush;		/* flush remainder of message */
} css_softc[NCSS];

/*
 * Reset the IMP and cause a transmitter interrupt by
 * performing a null DMA.
 */
cssprobe(reg)
        caddr_t reg;
{
        register int br, cvec;          /* r11, r10 value-result */
        register struct cssdevice *addr = (struct cssdevice *)reg;

#ifdef lint
        br = 0; cvec = br; br = cvec;
        cssrint(0); cssxint(0);
#endif

        addr->css_icsr = CSS_CLR;
        addr->css_ocsr = CSS_CLR;
        DELAY(50000);
	addr->css_icsr = 0;
	addr->css_ocsr = 0;
        DELAY(50000);

	addr->css_oba = 0;
	addr->css_owc = -1;
        addr->css_ocsr = CSS_IE | CSS_GO;	/* enable interrupts */
        DELAY(50000);
        addr->css_ocsr = 0;

        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.
 */
cssattach(ui)
        register struct uba_device *ui;
{
        register struct css_softc *sc = &css_softc[ui->ui_unit];
        register struct impcb *ip;

        if ((sc->css_imp = impattach(ui->ui_driver->ud_dname, ui->ui_unit,
	    cssreset)) == 0)
                return;
	ip = &sc->css_imp->imp_cb;
        ip->ic_init = cssinit;
        ip->ic_output = cssoutput;
        ip->ic_down = cssdown;
	sc->css_ifuba.ifu_flags = UBA_CANTWAIT | UBA_NEED16;
#ifdef notdef
	sc->css_ifuba.ifu_flags |= UBA_NEEDBDP;
#endif
}

/*
 * Reset interface after UNIBUS reset.
 * If interface is on specified uba, reset its state.
 */
cssreset(unit, uban)
        int unit, uban;
{
        register struct uba_device *ui;
        register struct css_softc *sc;

        if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0 ||
            ui->ui_ubanum != uban)
                return;
        printf(" css%d", unit);
        sc = &css_softc[unit];
	sc->css_imp->imp_if.if_flags &= ~IFF_RUNNING;
	cssoflush(unit);
        /* must go through IMP to allow it to set state */
        (*sc->css_imp->imp_if.if_init)(sc->css_imp->imp_if.if_unit);
}

/*
 * Initialize interface: clear recorded pending operations,
 * and retrieve, and reinitialize UNIBUS resources.
 */
cssinit(unit)
        int unit;
{       
        register struct css_softc *sc;
        register struct uba_device *ui;
        register struct cssdevice *addr;
        int x, info;

	if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0) {
		printf("css%d: not alive\n", unit);
		return(0);
	}
	sc = &css_softc[unit];

	/*
	 * Header length is 0 to if_ubainit since we have to pass
	 * the IMP leader up to the protocol interpretaion
	 * routines.  If we had the deader length as
	 * sizeof(struct imp_leader), then the if_ routines
	 * would assume we handle it on input and output.
	 */
	
        if ((sc->css_imp->imp_if.if_flags & IFF_RUNNING) == 0 &&
	    if_ubainit(&sc->css_ifuba, ui->ui_ubanum, 0,
	    (int)btoc(IMP_RCVBUF)) == 0) {
                printf("css%d: can't initialize\n", unit);
		ui->ui_alive = 0;
		sc->css_imp->imp_if.if_flags &= ~(IFF_UP | IFF_RUNNING);
		return(0);
        }
	sc->css_imp->imp_if.if_flags |= IFF_RUNNING;
        addr = (struct cssdevice *)ui->ui_addr;

        /* reset the imp interface. */
        x = spl5();
        addr->css_icsr = CSS_CLR;
        addr->css_ocsr = CSS_CLR;
	DELAY(100);
	addr->css_icsr = 0;
	addr->css_ocsr = 0;
        addr->css_icsr = IN_HRDY;       /* close the relay */
	DELAY(5000);
        splx(x);

        /*
	 * This may hang if the imp isn't really there.
	 * Will test and verify safe operation.
	 */

	x = 500;
	while (x-- > 0) {
		if ((addr->css_icsr & (IN_HRDY|IN_IMPNR)) == IN_HRDY) 
			break;
                addr->css_icsr = IN_HRDY;	/* close the relay */
                DELAY(5000);
        }

	if (x <= 0) {
		printf("css%d: imp doesn't respond, icsr=%b\n", unit,
			CSS_INBITS, addr->css_icsr);
		goto down;
	}

        /*
         * 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.
         */

        x = spl5();
        info = sc->css_ifuba.ifu_r.ifrw_info;
        addr->css_iba = (u_short)info;
        addr->css_iwc = -(IMP_RCVBUF >> 1);
        addr->css_icsr = 
                IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO;
        splx(x);
	return(1);

down:
	ui->ui_alive = 0;
	return(0);
}

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

	addr = (struct cssdevice *)(cssinfo[unit]->ui_addr);
        /* reset the imp interface. */
        addr->css_icsr = CSS_CLR;
        addr->css_ocsr = CSS_CLR;
	DELAY(100);
	addr->css_icsr = 0;
	addr->css_ocsr = 0;
	cssoflush(unit);
	return (1);
}

cssoflush(unit)
	int unit;
{
	register struct css_softc *sc = &css_softc[unit];

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

/*
 * Start output on an interface.
 */
cssoutput(unit, m)
        int unit;
        struct mbuf *m;
{
        int info;
        struct uba_device *ui = cssinfo[unit];
        register struct css_softc *sc = &css_softc[unit];
        register struct cssdevice *addr;

        sc->css_olen = if_wubaput(&sc->css_ifuba, m);
        /*
         * Have request mapped to UNIBUS for transmission.
         * Purge any stale data from the BDP, and start the output.
         */
	if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
		UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_w.ifrw_bdp);
        addr = (struct cssdevice *)ui->ui_addr;
        info = sc->css_ifuba.ifu_w.ifrw_info;
        addr->css_oba = (u_short)info;
        addr->css_owc = -((sc->css_olen + 1) >> 1);
        addr->css_ocsr =
	    (u_short)(CSS_IE | OUT_ENLB | ((info & 0x30000) >> 12) | CSS_GO);
        sc->css_imp->imp_cb.ic_oactive = 1;
}

/*
 * Output interrupt handler.
 */
cssxint(unit)
{
        register struct uba_device *ui = cssinfo[unit];
        register struct css_softc *sc = &css_softc[unit];
        register struct cssdevice *addr;

        addr = (struct cssdevice *)ui->ui_addr;
        if (sc->css_imp->imp_cb.ic_oactive == 0) {
                printf("css%d: stray output interrupt csr=%b\n",
			unit, addr->css_ocsr, CSS_OUTBITS);
                return;
        }
        sc->css_imp->imp_if.if_opackets++;
        sc->css_imp->imp_cb.ic_oactive = 0;
        if (addr->css_ocsr & CSS_ERR){
                sc->css_imp->imp_if.if_oerrors++;
                printf("css%d: output error, ocsr=%b icsr=%b\n", unit,
                        addr->css_ocsr, CSS_OUTBITS,
			addr->css_icsr, CSS_INBITS);
	}
	if (sc->css_ifuba.ifu_xtofree) {
		m_freem(sc->css_ifuba.ifu_xtofree);
		sc->css_ifuba.ifu_xtofree = 0;
	}
	impstart(sc->css_imp);
}

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

        sc->css_imp->imp_if.if_ipackets++;

        /*
         * Purge BDP; flush message if error indicated.
         */

        addr = (struct cssdevice *)cssinfo[unit]->ui_addr;
	if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
		UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_r.ifrw_bdp);
        if (addr->css_icsr & CSS_ERR) {
                printf("css%d: recv error, csr=%b\n", unit,
                    addr->css_icsr, CSS_INBITS);
                sc->css_imp->imp_if.if_ierrors++;
                sc->css_flush = 1;
        }

        if (sc->css_flush) {
                if (addr->css_icsr & IN_EOM)
                        sc->css_flush = 0;
                goto setup;
        }

        len = IMP_RCVBUF + (addr->css_iwc << 1);
	if (len < 0 || len > IMP_RCVBUF) {
		printf("css%d: bad length=%d\n", len);
		sc->css_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->css_ifuba, len, 0, &sc->css_imp->imp_if);
        if (m == 0)
                goto setup;
        if ((addr->css_icsr & IN_EOM) == 0) {
		if (sc->css_iq)
			m_cat(sc->css_iq, m);
		else
			sc->css_iq = m;
		goto setup;
	}
	if (sc->css_iq) {
		m_cat(sc->css_iq, m);
		m = sc->css_iq;
		sc->css_iq = 0;
        }
        impinput(unit, m);

setup:
        /*
         * Setup for next message.
         */
        info = sc->css_ifuba.ifu_r.ifrw_info;
        addr->css_iba = (u_short)info;
        addr->css_iwc = - (IMP_RCVBUF >> 1);
        addr->css_icsr =
                IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO;
}
#endif
Commit	Line	Data
da7c5cc6	1	/*
3c238487 MK	2	* Copyright (c) 1982,1986,1988 Regents of the University of California.
3c238487 MK	3	* All rights reserved.
da7c5cc6	4	*
3c238487 MK	5	* Redistribution and use in source and binary forms are permitted
	6	* provided that this notice is preserved and that due credit is given
	7	* to the University of California at Berkeley. The name of the University
	8	* may not be used to endorse or promote products derived from this
	9	* software without specific prior written permission. This software
	10	* is provided ``as is'' without express or implied warranty.
	11	*
2e5d9362	12	* @(#)if_css.c 7.5 (Berkeley) %G%
da7c5cc6	13	*/
ee6d9923 SL	14
ee6d9923 SL	15	#include "css.h"
9a0b0c74	16	#if NCSS > 0
ee6d9923 SL	17
	18	/*
	19	* DEC/CSS IMP11-A ARPAnet IMP interface driver.
	20	* Since "imp11a" is such a mouthful, it is called
	21	* "css" after the LH/DH being called "acc".
	22	*
	23	* Configuration notes:
	24	*
	25	* As delivered from DEC/CSS, it
	26	* is addressed and vectored as two DR11-B's. This makes
	27	* Autoconfig almost IMPOSSIBLE. To make it work, the
	28	* interrupt vectors must be restrapped to make the vectors
	29	* consecutive. The 020 hole between the CSR addresses is
	30	* tolerated, althought that could be cleaned-up also.
	31	*
	32	* Additionally, the TRANSMIT side of the IMP11-A has the
	33	* lower address of the two subunits, so the vector ordering
	34	* in the CONFIG file is reversed from most other devices.
	35	* It should be:
	36	*
	37	* device css0 .... cssxint cssrint
	38	*
	39	* If you get it wrong, it will still autoconfig, but will just
fd4d8418	40	* sit there with RECEIVE IDLE indicated on the front panel.
ee6d9923	41	*/
a6e960e7 JB	42	#include "param.h"
	43	#include "systm.h"
	44	#include "mbuf.h"
	45	#include "buf.h"
	46	#include "protosw.h"
	47	#include "socket.h"
	48	#include "vmmac.h"
a9687d27	49
3c238487 MK	50	#include "../machine/pte.h"
3c238487 MK	51
ee6d9923	52	#include "../net/if.h"
d2cc167c	53	#include "../netimp/if_imp.h"
a9687d27 BJ	54
	55	#include "../vax/cpu.h"
	56	#include "../vax/mtpr.h"
a6e960e7 JB	57	#include "if_cssreg.h"
a6e960e7 JB	58	#include "if_uba.h"
a9687d27 BJ	59	#include "../vaxuba/ubareg.h"
a9687d27 BJ	60	#include "../vaxuba/ubavar.h"
ee6d9923 SL	61
	62	int cssprobe(), cssattach(), cssrint(), cssxint();
	63	struct uba_device *cssinfo[NCSS];
	64	u_short cssstd[] = { 0 };
	65	struct uba_driver cssdriver =
	66	{ cssprobe, 0, cssattach, 0, cssstd, "css", cssinfo };
ee6d9923	67
3c238487	68	int cssinit(), cssoutput(), cssdown(), cssreset();
ee6d9923 SL	69
	70	/*
	71	* "Lower half" of IMP interface driver.
	72	*
	73	* Each IMP interface is handled by a common module which handles
	74	* the IMP-host protocol and a hardware driver which manages the
	75	* hardware specific details of talking with the IMP.
	76	*
	77	* The hardware portion of the IMP driver handles DMA and related
	78	* management of UNIBUS resources. The IMP protocol module interprets
	79	* contents of these messages and "controls" the actions of the
	80	* hardware module during IMP resets, but not, for instance, during
	81	* UNIBUS resets.
	82	*
	83	* The two modules are coupled at "attach time", and ever after,
	84	* through the imp interface structure. Higher level protocols,
	85	* e.g. IP, interact with the IMP driver, rather than the CSS.
	86	*/
	87	struct css_softc {
3c238487 MK	88	struct imp_softc css_imp; / pointer to IMP's imp_softc struct */
	89	struct ifuba css_ifuba; /* UNIBUS resources */
	90	struct mbuf css_iq; / input reassembly queue */
	91	short css_olen; /* size of last message sent */
	92	char css_flush; /* flush remainder of message */
ee6d9923 SL	93	} css_softc[NCSS];
	94
	95	/*
	96	* Reset the IMP and cause a transmitter interrupt by
	97	* performing a null DMA.
	98	*/
	99	cssprobe(reg)
	100	caddr_t reg;
	101	{
	102	register int br, cvec; /* r11, r10 value-result */
	103	register struct cssdevice addr = (struct cssdevice )reg;
	104
ee6d9923 SL	105	#ifdef lint
	106	br = 0; cvec = br; br = cvec;
	107	cssrint(0); cssxint(0);
	108	#endif
	109
ee6d9923 SL	110	addr->css_icsr = CSS_CLR;
	111	addr->css_ocsr = CSS_CLR;
	112	DELAY(50000);
	113	addr->css_icsr = 0;
	114	addr->css_ocsr = 0;
	115	DELAY(50000);
	116
	117	addr->css_oba = 0;
	118	addr->css_owc = -1;
	119	addr->css_ocsr = CSS_IE \| CSS_GO; /* enable interrupts */
	120	DELAY(50000);
	121	addr->css_ocsr = 0;
	122
	123	return (1);
	124	}
	125
	126	/*
	127	* Call the IMP module to allow it to set up its internal
	128	* state, then tie the two modules together by setting up
	129	* the back pointers to common data structures.
	130	*/
	131	cssattach(ui)
35718d8f	132	register struct uba_device *ui;
ee6d9923 SL	133	{
	134	register struct css_softc *sc = &css_softc[ui->ui_unit];
	135	register struct impcb *ip;
ee6d9923	136
35718d8f MK	137	if ((sc->css_imp = impattach(ui->ui_driver->ud_dname, ui->ui_unit,
35718d8f MK	138	cssreset)) == 0)
fd4d8418	139	return;
3c238487	140	ip = &sc->css_imp->imp_cb;
ee6d9923	141	ip->ic_init = cssinit;
3c238487 MK	142	ip->ic_output = cssoutput;
3c238487 MK	143	ip->ic_down = cssdown;
ee6d9923 SL	144	sc->css_ifuba.ifu_flags = UBA_CANTWAIT \| UBA_NEED16;
ee6d9923 SL	145	#ifdef notdef
04ecf99a	146	sc->css_ifuba.ifu_flags \|= UBA_NEEDBDP;
ee6d9923 SL	147	#endif
	148	}
	149
	150	/*
	151	* Reset interface after UNIBUS reset.
	152	* If interface is on specified uba, reset its state.
	153	*/
	154	cssreset(unit, uban)
	155	int unit, uban;
	156	{
	157	register struct uba_device *ui;
3c238487	158	register struct css_softc *sc;
ee6d9923	159
ee6d9923 SL	160	if (unit >= NCSS \|\| (ui = cssinfo[unit]) == 0 \|\| ui->ui_alive == 0 \|\|
	161	ui->ui_ubanum != uban)
	162	return;
	163	printf(" css%d", unit);
	164	sc = &css_softc[unit];
3c238487	165	sc->css_imp->imp_if.if_flags &= ~IFF_RUNNING;
35718d8f	166	cssoflush(unit);
ee6d9923	167	/* must go through IMP to allow it to set state */
3c238487	168	(*sc->css_imp->imp_if.if_init)(sc->css_imp->imp_if.if_unit);
ee6d9923 SL	169	}
	170
	171	/*
	172	* Initialize interface: clear recorded pending operations,
	173	* and retrieve, and reinitialize UNIBUS resources.
	174	*/
	175	cssinit(unit)
	176	int unit;
	177	{
	178	register struct css_softc *sc;
	179	register struct uba_device *ui;
	180	register struct cssdevice *addr;
	181	int x, info;
	182
ee6d9923 SL	183	if (unit >= NCSS \|\| (ui = cssinfo[unit]) == 0 \|\| ui->ui_alive == 0) {
	184	printf("css%d: not alive\n", unit);
	185	return(0);
	186	}
	187	sc = &css_softc[unit];
	188
	189	/*
	190	* Header length is 0 to if_ubainit since we have to pass
	191	* the IMP leader up to the protocol interpretaion
	192	* routines. If we had the deader length as
	193	* sizeof(struct imp_leader), then the if_ routines
	194	* would assume we handle it on input and output.
	195	*/
	196
3c238487 MK	197	if ((sc->css_imp->imp_if.if_flags & IFF_RUNNING) == 0 &&
	198	if_ubainit(&sc->css_ifuba, ui->ui_ubanum, 0,
	199	(int)btoc(IMP_RCVBUF)) == 0) {
ee6d9923 SL	200	printf("css%d: can't initialize\n", unit);
ee6d9923 SL	201	ui->ui_alive = 0;
3c238487	202	sc->css_imp->imp_if.if_flags &= ~(IFF_UP \| IFF_RUNNING);
ee6d9923 SL	203	return(0);
ee6d9923 SL	204	}
3c238487	205	sc->css_imp->imp_if.if_flags \|= IFF_RUNNING;
ee6d9923 SL	206	addr = (struct cssdevice *)ui->ui_addr;
	207
	208	/* reset the imp interface. */
	209	x = spl5();
	210	addr->css_icsr = CSS_CLR;
	211	addr->css_ocsr = CSS_CLR;
	212	DELAY(100);
	213	addr->css_icsr = 0;
	214	addr->css_ocsr = 0;
	215	addr->css_icsr = IN_HRDY; /* close the relay */
	216	DELAY(5000);
	217	splx(x);
	218
	219	/*
	220	* This may hang if the imp isn't really there.
	221	* Will test and verify safe operation.
	222	*/
	223
	224	x = 500;
	225	while (x-- > 0) {
	226	if ((addr->css_icsr & (IN_HRDY\|IN_IMPNR)) == IN_HRDY)
	227	break;
	228	addr->css_icsr = IN_HRDY; /* close the relay */
	229	DELAY(5000);
	230	}
	231
	232	if (x <= 0) {
	233	printf("css%d: imp doesn't respond, icsr=%b\n", unit,
	234	CSS_INBITS, addr->css_icsr);
	235	goto down;
	236	}
	237
	238	/*
	239	* Put up a read. We can't restart any outstanding writes
	240	* until we're back in synch with the IMP (i.e. we've flushed
	241	* the NOOPs it throws at us).
3c238487	242	* Note: IMP_RCVBUF includes the leader.
ee6d9923 SL	243	*/
	244
	245	x = spl5();
	246	info = sc->css_ifuba.ifu_r.ifrw_info;
	247	addr->css_iba = (u_short)info;
3c238487	248	addr->css_iwc = -(IMP_RCVBUF >> 1);
ee6d9923 SL	249	addr->css_icsr =
	250	IN_HRDY \| CSS_IE \| IN_WEN \| ((info & 0x30000) >> 12) \| CSS_GO;
	251	splx(x);
	252	return(1);
	253
	254	down:
	255	ui->ui_alive = 0;
	256	return(0);
	257	}
	258
3c238487 MK	259	/*
	260	* Drop the host ready line to mark host down.
	261	* UNTESTED.
	262	*/
	263	cssdown(unit)
	264	int unit;
	265	{
	266	register struct cssdevice *addr;
3c238487 MK	267
	268	addr = (struct cssdevice *)(cssinfo[unit]->ui_addr);
	269	/* reset the imp interface. */
3c238487 MK	270	addr->css_icsr = CSS_CLR;
	271	addr->css_ocsr = CSS_CLR;
	272	DELAY(100);
	273	addr->css_icsr = 0;
	274	addr->css_ocsr = 0;
35718d8f	275	cssoflush(unit);
3c238487 MK	276	return (1);
	277	}
	278
35718d8f MK	279	cssoflush(unit)
	280	int unit;
	281	{
2e5d9362	282	register struct css_softc *sc = &css_softc[unit];
35718d8f	283
2e5d9362 MK	284	sc->css_imp->imp_cb.ic_oactive = 0;
	285	if (sc->css_ifuba.ifu_xtofree) {
	286	m_freem(sc->css_ifuba.ifu_xtofree);
	287	sc->css_ifuba.ifu_xtofree = 0;
35718d8f MK	288	}
	289	}
	290
ee6d9923 SL	291	/*
	292	* Start output on an interface.
	293	*/
3c238487 MK	294	cssoutput(unit, m)
	295	int unit;
	296	struct mbuf *m;
ee6d9923	297	{
3c238487	298	int info;
ee6d9923 SL	299	struct uba_device *ui = cssinfo[unit];
	300	register struct css_softc *sc = &css_softc[unit];
	301	register struct cssdevice *addr;
ee6d9923	302
ee6d9923	303	sc->css_olen = if_wubaput(&sc->css_ifuba, m);
ee6d9923 SL	304	/*
	305	* Have request mapped to UNIBUS for transmission.
	306	* Purge any stale data from the BDP, and start the output.
	307	*/
	308	if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
	309	UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_w.ifrw_bdp);
	310	addr = (struct cssdevice *)ui->ui_addr;
	311	info = sc->css_ifuba.ifu_w.ifrw_info;
	312	addr->css_oba = (u_short)info;
	313	addr->css_owc = -((sc->css_olen + 1) >> 1);
3c238487 MK	314	addr->css_ocsr =
	315	(u_short)(CSS_IE \| OUT_ENLB \| ((info & 0x30000) >> 12) \| CSS_GO);
	316	sc->css_imp->imp_cb.ic_oactive = 1;
ee6d9923 SL	317	}
	318
	319	/*
	320	* Output interrupt handler.
	321	*/
	322	cssxint(unit)
	323	{
	324	register struct uba_device *ui = cssinfo[unit];
	325	register struct css_softc *sc = &css_softc[unit];
	326	register struct cssdevice *addr;
	327
ee6d9923	328	addr = (struct cssdevice *)ui->ui_addr;
3c238487	329	if (sc->css_imp->imp_cb.ic_oactive == 0) {
ee6d9923 SL	330	printf("css%d: stray output interrupt csr=%b\n",
	331	unit, addr->css_ocsr, CSS_OUTBITS);
	332	return;
	333	}
3c238487 MK	334	sc->css_imp->imp_if.if_opackets++;
3c238487 MK	335	sc->css_imp->imp_cb.ic_oactive = 0;
ee6d9923	336	if (addr->css_ocsr & CSS_ERR){
3c238487	337	sc->css_imp->imp_if.if_oerrors++;
ee6d9923 SL	338	printf("css%d: output error, ocsr=%b icsr=%b\n", unit,
	339	addr->css_ocsr, CSS_OUTBITS,
	340	addr->css_icsr, CSS_INBITS);
	341	}
	342	if (sc->css_ifuba.ifu_xtofree) {
	343	m_freem(sc->css_ifuba.ifu_xtofree);
	344	sc->css_ifuba.ifu_xtofree = 0;
	345	}
3c238487	346	impstart(sc->css_imp);
ee6d9923 SL	347	}
	348
	349	/*
	350	* Input interrupt handler
	351	*/
	352	cssrint(unit)
	353	{
	354	register struct css_softc *sc = &css_softc[unit];
	355	register struct cssdevice *addr;
ee6d9923 SL	356	struct mbuf *m;
	357	int len, info;
	358
3c238487	359	sc->css_imp->imp_if.if_ipackets++;
ee6d9923 SL	360
	361	/*
	362	* Purge BDP; flush message if error indicated.
	363	*/
	364
	365	addr = (struct cssdevice *)cssinfo[unit]->ui_addr;
	366	if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
	367	UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_r.ifrw_bdp);
	368	if (addr->css_icsr & CSS_ERR) {
	369	printf("css%d: recv error, csr=%b\n", unit,
	370	addr->css_icsr, CSS_INBITS);
3c238487	371	sc->css_imp->imp_if.if_ierrors++;
ee6d9923 SL	372	sc->css_flush = 1;
	373	}
	374
	375	if (sc->css_flush) {
	376	if (addr->css_icsr & IN_EOM)
	377	sc->css_flush = 0;
	378	goto setup;
	379	}
	380
3c238487 MK	381	len = IMP_RCVBUF + (addr->css_iwc << 1);
3c238487 MK	382	if (len < 0 \|\| len > IMP_RCVBUF) {
ee6d9923	383	printf("css%d: bad length=%d\n", len);
3c238487	384	sc->css_imp->imp_if.if_ierrors++;
ee6d9923 SL	385	goto setup;
	386	}
	387
	388	/*
fd4d8418	389	* The offset parameter is always 0 since using
ee6d9923 SL	390	* trailers on the ARPAnet is insane.
ee6d9923 SL	391	*/
3c238487	392	m = if_rubaget(&sc->css_ifuba, len, 0, &sc->css_imp->imp_if);
ee6d9923 SL	393	if (m == 0)
	394	goto setup;
	395	if ((addr->css_icsr & IN_EOM) == 0) {
	396	if (sc->css_iq)
	397	m_cat(sc->css_iq, m);
	398	else
	399	sc->css_iq = m;
	400	goto setup;
	401	}
	402	if (sc->css_iq) {
	403	m_cat(sc->css_iq, m);
	404	m = sc->css_iq;
	405	sc->css_iq = 0;
	406	}
	407	impinput(unit, m);
	408
	409	setup:
	410	/*
	411	* Setup for next message.
	412	*/
	413	info = sc->css_ifuba.ifu_r.ifrw_info;
	414	addr->css_iba = (u_short)info;
3c238487	415	addr->css_iwc = - (IMP_RCVBUF >> 1);
ee6d9923 SL	416	addr->css_icsr =
	417	IN_HRDY \| CSS_IE \| IN_WEN \| ((info & 0x30000) >> 12) \| CSS_GO;
	418	}
9a0b0c74	419	#endif