[unix-history] / usr / src / sys / vaxif / if_css.c

/*
 * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution is only permitted until one year after the first shipment
 * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
 * binary forms are permitted provided that: (1) source distributions retain
 * this entire copyright notice and comment, and (2) distributions including
 * binaries display the following acknowledgement:  This product includes
 * software developed by the University of California, Berkeley and its
 * contributors'' in the documentation or other materials provided with the
 * distribution and in all advertising materials mentioning features or use
 * of this software.  Neither the name of the University nor the names of
 * its contributors may 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
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *	@(#)if_css.c	7.8 (Berkeley) 6/28/90
 */

#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	/*
616d42db	2	* Copyright (c) 1982, 1986, 1988 Regents of the University of California.
3c238487	3	* All rights reserved.
da7c5cc6	4	*
1c15e888 C	5	* Redistribution is only permitted until one year after the first shipment
	6	* of 4.4BSD by the Regents. Otherwise, redistribution and use in source and
	7	* binary forms are permitted provided that: (1) source distributions retain
	8	* this entire copyright notice and comment, and (2) distributions including
	9	* binaries display the following acknowledgement: This product includes
	10	* software developed by the University of California, Berkeley and its
	11	* contributors'' in the documentation or other materials provided with the
	12	* distribution and in all advertising materials mentioning features or use
	13	* of this software. Neither the name of the University nor the names of
	14	* its contributors may be used to endorse or promote products derived from
	15	* this software without specific prior written permission.
	16	* THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
	17	* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
	18	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
3c238487	19	*
1c15e888	20	* @(#)if_css.c 7.8 (Berkeley) 6/28/90
da7c5cc6	21	*/
ee6d9923 SL	22
ee6d9923 SL	23	#include "css.h"
9a0b0c74	24	#if NCSS > 0
ee6d9923 SL	25
	26	/*
	27	* DEC/CSS IMP11-A ARPAnet IMP interface driver.
	28	* Since "imp11a" is such a mouthful, it is called
	29	* "css" after the LH/DH being called "acc".
	30	*
	31	* Configuration notes:
	32	*
	33	* As delivered from DEC/CSS, it
	34	* is addressed and vectored as two DR11-B's. This makes
	35	* Autoconfig almost IMPOSSIBLE. To make it work, the
	36	* interrupt vectors must be restrapped to make the vectors
	37	* consecutive. The 020 hole between the CSR addresses is
	38	* tolerated, althought that could be cleaned-up also.
	39	*
	40	* Additionally, the TRANSMIT side of the IMP11-A has the
	41	* lower address of the two subunits, so the vector ordering
	42	* in the CONFIG file is reversed from most other devices.
	43	* It should be:
	44	*
	45	* device css0 .... cssxint cssrint
	46	*
	47	* If you get it wrong, it will still autoconfig, but will just
fd4d8418	48	* sit there with RECEIVE IDLE indicated on the front panel.
ee6d9923	49	*/
a6e960e7 JB	50	#include "param.h"
	51	#include "systm.h"
	52	#include "mbuf.h"
	53	#include "buf.h"
	54	#include "protosw.h"
	55	#include "socket.h"
	56	#include "vmmac.h"
a9687d27	57
1c15e888	58	#include "machine/pte.h"
3c238487	59
ee6d9923	60	#include "../net/if.h"
d2cc167c	61	#include "../netimp/if_imp.h"
a9687d27 BJ	62
	63	#include "../vax/cpu.h"
	64	#include "../vax/mtpr.h"
a6e960e7 JB	65	#include "if_cssreg.h"
a6e960e7 JB	66	#include "if_uba.h"
a9687d27 BJ	67	#include "../vaxuba/ubareg.h"
a9687d27 BJ	68	#include "../vaxuba/ubavar.h"
ee6d9923 SL	69
	70	int cssprobe(), cssattach(), cssrint(), cssxint();
	71	struct uba_device *cssinfo[NCSS];
	72	u_short cssstd[] = { 0 };
	73	struct uba_driver cssdriver =
	74	{ cssprobe, 0, cssattach, 0, cssstd, "css", cssinfo };
ee6d9923	75
3c238487	76	int cssinit(), cssoutput(), cssdown(), cssreset();
ee6d9923 SL	77
	78	/*
	79	* "Lower half" of IMP interface driver.
	80	*
	81	* Each IMP interface is handled by a common module which handles
	82	* the IMP-host protocol and a hardware driver which manages the
	83	* hardware specific details of talking with the IMP.
	84	*
	85	* The hardware portion of the IMP driver handles DMA and related
	86	* management of UNIBUS resources. The IMP protocol module interprets
	87	* contents of these messages and "controls" the actions of the
	88	* hardware module during IMP resets, but not, for instance, during
	89	* UNIBUS resets.
	90	*
	91	* The two modules are coupled at "attach time", and ever after,
	92	* through the imp interface structure. Higher level protocols,
	93	* e.g. IP, interact with the IMP driver, rather than the CSS.
	94	*/
	95	struct css_softc {
3c238487 MK	96	struct imp_softc css_imp; / pointer to IMP's imp_softc struct */
	97	struct ifuba css_ifuba; /* UNIBUS resources */
	98	struct mbuf css_iq; / input reassembly queue */
	99	short css_olen; /* size of last message sent */
	100	char css_flush; /* flush remainder of message */
ee6d9923 SL	101	} css_softc[NCSS];
	102
	103	/*
	104	* Reset the IMP and cause a transmitter interrupt by
	105	* performing a null DMA.
	106	*/
	107	cssprobe(reg)
	108	caddr_t reg;
	109	{
	110	register int br, cvec; /* r11, r10 value-result */
	111	register struct cssdevice addr = (struct cssdevice )reg;
	112
ee6d9923 SL	113	#ifdef lint
	114	br = 0; cvec = br; br = cvec;
	115	cssrint(0); cssxint(0);
	116	#endif
	117
ee6d9923 SL	118	addr->css_icsr = CSS_CLR;
	119	addr->css_ocsr = CSS_CLR;
	120	DELAY(50000);
	121	addr->css_icsr = 0;
	122	addr->css_ocsr = 0;
	123	DELAY(50000);
	124
	125	addr->css_oba = 0;
	126	addr->css_owc = -1;
	127	addr->css_ocsr = CSS_IE \| CSS_GO; /* enable interrupts */
	128	DELAY(50000);
	129	addr->css_ocsr = 0;
	130
	131	return (1);
	132	}
	133
	134	/*
	135	* Call the IMP module to allow it to set up its internal
	136	* state, then tie the two modules together by setting up
	137	* the back pointers to common data structures.
	138	*/
	139	cssattach(ui)
35718d8f	140	register struct uba_device *ui;
ee6d9923 SL	141	{
	142	register struct css_softc *sc = &css_softc[ui->ui_unit];
	143	register struct impcb *ip;
ee6d9923	144
35718d8f MK	145	if ((sc->css_imp = impattach(ui->ui_driver->ud_dname, ui->ui_unit,
35718d8f MK	146	cssreset)) == 0)
fd4d8418	147	return;
3c238487	148	ip = &sc->css_imp->imp_cb;
ee6d9923	149	ip->ic_init = cssinit;
3c238487 MK	150	ip->ic_output = cssoutput;
3c238487 MK	151	ip->ic_down = cssdown;
ee6d9923 SL	152	sc->css_ifuba.ifu_flags = UBA_CANTWAIT \| UBA_NEED16;
ee6d9923 SL	153	#ifdef notdef
04ecf99a	154	sc->css_ifuba.ifu_flags \|= UBA_NEEDBDP;
ee6d9923 SL	155	#endif
	156	}
	157
	158	/*
	159	* Reset interface after UNIBUS reset.
	160	* If interface is on specified uba, reset its state.
	161	*/
	162	cssreset(unit, uban)
	163	int unit, uban;
	164	{
	165	register struct uba_device *ui;
3c238487	166	register struct css_softc *sc;
ee6d9923	167
ee6d9923 SL	168	if (unit >= NCSS \|\| (ui = cssinfo[unit]) == 0 \|\| ui->ui_alive == 0 \|\|
	169	ui->ui_ubanum != uban)
	170	return;
	171	printf(" css%d", unit);
	172	sc = &css_softc[unit];
3c238487	173	sc->css_imp->imp_if.if_flags &= ~IFF_RUNNING;
35718d8f	174	cssoflush(unit);
ee6d9923	175	/* must go through IMP to allow it to set state */
3c238487	176	(*sc->css_imp->imp_if.if_init)(sc->css_imp->imp_if.if_unit);
ee6d9923 SL	177	}
	178
	179	/*
	180	* Initialize interface: clear recorded pending operations,
	181	* and retrieve, and reinitialize UNIBUS resources.
	182	*/
	183	cssinit(unit)
	184	int unit;
	185	{
	186	register struct css_softc *sc;
	187	register struct uba_device *ui;
	188	register struct cssdevice *addr;
	189	int x, info;
	190
ee6d9923 SL	191	if (unit >= NCSS \|\| (ui = cssinfo[unit]) == 0 \|\| ui->ui_alive == 0) {
	192	printf("css%d: not alive\n", unit);
	193	return(0);
	194	}
	195	sc = &css_softc[unit];
	196
	197	/*
	198	* Header length is 0 to if_ubainit since we have to pass
	199	* the IMP leader up to the protocol interpretaion
	200	* routines. If we had the deader length as
	201	* sizeof(struct imp_leader), then the if_ routines
	202	* would assume we handle it on input and output.
	203	*/
	204
3c238487 MK	205	if ((sc->css_imp->imp_if.if_flags & IFF_RUNNING) == 0 &&
	206	if_ubainit(&sc->css_ifuba, ui->ui_ubanum, 0,
	207	(int)btoc(IMP_RCVBUF)) == 0) {
ee6d9923 SL	208	printf("css%d: can't initialize\n", unit);
ee6d9923 SL	209	ui->ui_alive = 0;
3c238487	210	sc->css_imp->imp_if.if_flags &= ~(IFF_UP \| IFF_RUNNING);
ee6d9923 SL	211	return(0);
ee6d9923 SL	212	}
3c238487	213	sc->css_imp->imp_if.if_flags \|= IFF_RUNNING;
ee6d9923 SL	214	addr = (struct cssdevice *)ui->ui_addr;
	215
	216	/* reset the imp interface. */
	217	x = spl5();
	218	addr->css_icsr = CSS_CLR;
	219	addr->css_ocsr = CSS_CLR;
	220	DELAY(100);
	221	addr->css_icsr = 0;
	222	addr->css_ocsr = 0;
	223	addr->css_icsr = IN_HRDY; /* close the relay */
	224	DELAY(5000);
	225	splx(x);
	226
	227	/*
	228	* This may hang if the imp isn't really there.
	229	* Will test and verify safe operation.
	230	*/
	231
	232	x = 500;
	233	while (x-- > 0) {
	234	if ((addr->css_icsr & (IN_HRDY\|IN_IMPNR)) == IN_HRDY)
	235	break;
	236	addr->css_icsr = IN_HRDY; /* close the relay */
	237	DELAY(5000);
	238	}
	239
	240	if (x <= 0) {
	241	printf("css%d: imp doesn't respond, icsr=%b\n", unit,
	242	CSS_INBITS, addr->css_icsr);
	243	goto down;
	244	}
	245
	246	/*
	247	* Put up a read. We can't restart any outstanding writes
	248	* until we're back in synch with the IMP (i.e. we've flushed
	249	* the NOOPs it throws at us).
3c238487	250	* Note: IMP_RCVBUF includes the leader.
ee6d9923 SL	251	*/
	252
	253	x = spl5();
	254	info = sc->css_ifuba.ifu_r.ifrw_info;
	255	addr->css_iba = (u_short)info;
3c238487	256	addr->css_iwc = -(IMP_RCVBUF >> 1);
ee6d9923 SL	257	addr->css_icsr =
	258	IN_HRDY \| CSS_IE \| IN_WEN \| ((info & 0x30000) >> 12) \| CSS_GO;
	259	splx(x);
	260	return(1);
	261
	262	down:
	263	ui->ui_alive = 0;
	264	return(0);
	265	}
	266
3c238487 MK	267	/*
	268	* Drop the host ready line to mark host down.
	269	* UNTESTED.
	270	*/
	271	cssdown(unit)
	272	int unit;
	273	{
	274	register struct cssdevice *addr;
3c238487 MK	275
	276	addr = (struct cssdevice *)(cssinfo[unit]->ui_addr);
	277	/* reset the imp interface. */
3c238487 MK	278	addr->css_icsr = CSS_CLR;
	279	addr->css_ocsr = CSS_CLR;
	280	DELAY(100);
	281	addr->css_icsr = 0;
	282	addr->css_ocsr = 0;
35718d8f	283	cssoflush(unit);
3c238487 MK	284	return (1);
	285	}
	286
35718d8f MK	287	cssoflush(unit)
	288	int unit;
	289	{
2e5d9362	290	register struct css_softc *sc = &css_softc[unit];
35718d8f	291
2e5d9362 MK	292	sc->css_imp->imp_cb.ic_oactive = 0;
	293	if (sc->css_ifuba.ifu_xtofree) {
	294	m_freem(sc->css_ifuba.ifu_xtofree);
	295	sc->css_ifuba.ifu_xtofree = 0;
35718d8f MK	296	}
	297	}
	298
ee6d9923 SL	299	/*
	300	* Start output on an interface.
	301	*/
3c238487 MK	302	cssoutput(unit, m)
	303	int unit;
	304	struct mbuf *m;
ee6d9923	305	{
3c238487	306	int info;
ee6d9923 SL	307	struct uba_device *ui = cssinfo[unit];
	308	register struct css_softc *sc = &css_softc[unit];
	309	register struct cssdevice *addr;
ee6d9923	310
ee6d9923	311	sc->css_olen = if_wubaput(&sc->css_ifuba, m);
ee6d9923 SL	312	/*
	313	* Have request mapped to UNIBUS for transmission.
	314	* Purge any stale data from the BDP, and start the output.
	315	*/
	316	if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
	317	UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_w.ifrw_bdp);
	318	addr = (struct cssdevice *)ui->ui_addr;
	319	info = sc->css_ifuba.ifu_w.ifrw_info;
	320	addr->css_oba = (u_short)info;
	321	addr->css_owc = -((sc->css_olen + 1) >> 1);
3c238487 MK	322	addr->css_ocsr =
	323	(u_short)(CSS_IE \| OUT_ENLB \| ((info & 0x30000) >> 12) \| CSS_GO);
	324	sc->css_imp->imp_cb.ic_oactive = 1;
ee6d9923 SL	325	}
	326
	327	/*
	328	* Output interrupt handler.
	329	*/
	330	cssxint(unit)
	331	{
	332	register struct uba_device *ui = cssinfo[unit];
	333	register struct css_softc *sc = &css_softc[unit];
	334	register struct cssdevice *addr;
	335
ee6d9923	336	addr = (struct cssdevice *)ui->ui_addr;
3c238487	337	if (sc->css_imp->imp_cb.ic_oactive == 0) {
ee6d9923 SL	338	printf("css%d: stray output interrupt csr=%b\n",
	339	unit, addr->css_ocsr, CSS_OUTBITS);
	340	return;
	341	}
3c238487 MK	342	sc->css_imp->imp_if.if_opackets++;
3c238487 MK	343	sc->css_imp->imp_cb.ic_oactive = 0;
ee6d9923	344	if (addr->css_ocsr & CSS_ERR){
3c238487	345	sc->css_imp->imp_if.if_oerrors++;
ee6d9923 SL	346	printf("css%d: output error, ocsr=%b icsr=%b\n", unit,
	347	addr->css_ocsr, CSS_OUTBITS,
	348	addr->css_icsr, CSS_INBITS);
	349	}
	350	if (sc->css_ifuba.ifu_xtofree) {
	351	m_freem(sc->css_ifuba.ifu_xtofree);
	352	sc->css_ifuba.ifu_xtofree = 0;
	353	}
3c238487	354	impstart(sc->css_imp);
ee6d9923 SL	355	}
	356
	357	/*
	358	* Input interrupt handler
	359	*/
	360	cssrint(unit)
	361	{
	362	register struct css_softc *sc = &css_softc[unit];
	363	register struct cssdevice *addr;
ee6d9923 SL	364	struct mbuf *m;
	365	int len, info;
	366
3c238487	367	sc->css_imp->imp_if.if_ipackets++;
ee6d9923 SL	368
	369	/*
	370	* Purge BDP; flush message if error indicated.
	371	*/
	372
	373	addr = (struct cssdevice *)cssinfo[unit]->ui_addr;
	374	if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
	375	UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_r.ifrw_bdp);
	376	if (addr->css_icsr & CSS_ERR) {
	377	printf("css%d: recv error, csr=%b\n", unit,
	378	addr->css_icsr, CSS_INBITS);
3c238487	379	sc->css_imp->imp_if.if_ierrors++;
ee6d9923 SL	380	sc->css_flush = 1;
	381	}
	382
	383	if (sc->css_flush) {
	384	if (addr->css_icsr & IN_EOM)
	385	sc->css_flush = 0;
	386	goto setup;
	387	}
	388
3c238487 MK	389	len = IMP_RCVBUF + (addr->css_iwc << 1);
3c238487 MK	390	if (len < 0 \|\| len > IMP_RCVBUF) {
ee6d9923	391	printf("css%d: bad length=%d\n", len);
3c238487	392	sc->css_imp->imp_if.if_ierrors++;
ee6d9923 SL	393	goto setup;
	394	}
	395
	396	/*
fd4d8418	397	* The offset parameter is always 0 since using
ee6d9923 SL	398	* trailers on the ARPAnet is insane.
ee6d9923 SL	399	*/
3c238487	400	m = if_rubaget(&sc->css_ifuba, len, 0, &sc->css_imp->imp_if);
ee6d9923 SL	401	if (m == 0)
	402	goto setup;
	403	if ((addr->css_icsr & IN_EOM) == 0) {
	404	if (sc->css_iq)
	405	m_cat(sc->css_iq, m);
	406	else
	407	sc->css_iq = m;
	408	goto setup;
	409	}
	410	if (sc->css_iq) {
	411	m_cat(sc->css_iq, m);
	412	m = sc->css_iq;
	413	sc->css_iq = 0;
	414	}
	415	impinput(unit, m);
	416
	417	setup:
	418	/*
	419	* Setup for next message.
	420	*/
	421	info = sc->css_ifuba.ifu_r.ifrw_info;
	422	addr->css_iba = (u_short)info;
3c238487	423	addr->css_iwc = - (IMP_RCVBUF >> 1);
ee6d9923 SL	424	addr->css_icsr =
	425	IN_HRDY \| CSS_IE \| IN_WEN \| ((info & 0x30000) >> 12) \| CSS_GO;
	426	}
9a0b0c74	427	#endif