[unix-history] / usr / src / sys / vax / if / 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	7.6 (Berkeley) %G%
 */

#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
Commit	Line	Data
da7c5cc6	1	/*
616d42db	2	* Copyright (c) 1982, 1986, 1988 Regents of the University of California.
360a9d4e	3	* All rights reserved.
da7c5cc6	4	*
360a9d4e	5	* Redistribution and use in source and binary forms are permitted
616d42db KB	6	* provided that the above copyright notice and this paragraph are
	7	* duplicated in all such forms and that any documentation,
	8	* advertising materials, and other materials related to such
	9	* distribution and use acknowledge that the software was developed
	10	* by the University of California, Berkeley. The name of the
	11	* University may not be used to endorse or promote products derived
	12	* from this software without specific prior written permission.
	13	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
	14	* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
	15	* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
360a9d4e	16	*
c18e27ed	17	* @(#)if_acc.c 7.6 (Berkeley) %G%
da7c5cc6	18	*/
28081cf8 SL	19
28081cf8 SL	20	#include "acc.h"
9498ec5c	21	#if NACC > 0
28081cf8 SL	22
	23	/*
	24	* ACC LH/DH ARPAnet IMP interface driver.
	25	*/
c18e27ed	26	#include "machine/pte.h"
28081cf8	27
a6e960e7 JB	28	#include "param.h"
	29	#include "systm.h"
	30	#include "mbuf.h"
	31	#include "buf.h"
	32	#include "protosw.h"
	33	#include "socket.h"
	34	#include "vmmac.h"
a9687d27	35
28081cf8	36	#include "../net/if.h"
d2cc167c	37	#include "../netimp/if_imp.h"
a9687d27 BJ	38
	39	#include "../vax/cpu.h"
	40	#include "../vax/mtpr.h"
a6e960e7 JB	41	#include "if_accreg.h"
a6e960e7 JB	42	#include "if_uba.h"
a9687d27 BJ	43	#include "../vaxuba/ubareg.h"
a9687d27 BJ	44	#include "../vaxuba/ubavar.h"
28081cf8 SL	45
	46	int accprobe(), accattach(), accrint(), accxint();
	47	struct uba_device *accinfo[NACC];
	48	u_short accstd[] = { 0 };
	49	struct uba_driver accdriver =
	50	{ accprobe, 0, accattach, 0, accstd, "acc", accinfo };
28081cf8	51
3c238487	52	int accinit(), accoutput(), accdown(), accreset();
28081cf8 SL	53
	54	/*
	55	* "Lower half" of IMP interface driver.
	56	*
	57	* Each IMP interface is handled by a common module which handles
	58	* the IMP-host protocol and a hardware driver which manages the
	59	* hardware specific details of talking with the IMP.
	60	*
	61	* The hardware portion of the IMP driver handles DMA and related
	62	* management of UNIBUS resources. The IMP protocol module interprets
	63	* contents of these messages and "controls" the actions of the
	64	* hardware module during IMP resets, but not, for instance, during
	65	* UNIBUS resets.
	66	*
	67	* The two modules are coupled at "attach time", and ever after,
	68	* through the imp interface structure. Higher level protocols,
	69	* e.g. IP, interact with the IMP driver, rather than the ACC.
	70	*/
	71	struct acc_softc {
3c238487	72	struct imp_softc acc_imp; / data structure shared with IMP */
28081cf8 SL	73	struct ifuba acc_ifuba; /* UNIBUS resources */
	74	struct mbuf acc_iq; / input reassembly queue */
	75	short acc_olen; /* size of last message sent */
	76	char acc_flush; /* flush remainder of message */
28081cf8 SL	77	} acc_softc[NACC];
	78
	79	/*
	80	* Reset the IMP and cause a transmitter interrupt by
	81	* performing a null DMA.
	82	*/
	83	accprobe(reg)
	84	caddr_t reg;
	85	{
	86	register int br, cvec; /* r11, r10 value-result */
	87	register struct accdevice addr = (struct accdevice )reg;
	88
28081cf8 SL	89	#ifdef lint
	90	br = 0; cvec = br; br = cvec;
	91	accrint(0); accxint(0);
	92	#endif
a2cd4df7 BJ	93	addr->icsr = ACC_RESET; DELAY(5000);
	94	addr->ocsr = ACC_RESET; DELAY(5000);
	95	addr->ocsr = OUT_BBACK; DELAY(5000);
	96	addr->owc = 0;
	97	addr->ocsr = ACC_IE \| ACC_GO; DELAY(5000);
7dd4b7cb	98	addr->ocsr = 0;
a2cd4df7	99	if (cvec && cvec != 0x200) /* transmit -> receive */
28081cf8 SL	100	cvec -= 4;
	101	return (1);
	102	}
	103
	104	/*
	105	* Call the IMP module to allow it to set up its internal
	106	* state, then tie the two modules together by setting up
	107	* the back pointers to common data structures.
	108	*/
	109	accattach(ui)
35718d8f	110	register struct uba_device *ui;
28081cf8 SL	111	{
	112	register struct acc_softc *sc = &acc_softc[ui->ui_unit];
	113	register struct impcb *ip;
28081cf8	114
35718d8f MK	115	if ((sc->acc_imp = impattach(ui->ui_driver->ud_dname, ui->ui_unit,
35718d8f MK	116	accreset)) == 0)
fd4d8418	117	return;
3c238487	118	ip = &sc->acc_imp->imp_cb;
28081cf8	119	ip->ic_init = accinit;
3c238487 MK	120	ip->ic_output = accoutput;
3c238487 MK	121	ip->ic_down = accdown;
92aca3da	122	sc->acc_ifuba.ifu_flags = UBA_CANTWAIT;
a2cd4df7	123	#ifdef notdef
7dfb87a5	124	sc->acc_ifuba.ifu_flags \|= UBA_NEEDBDP;
a2cd4df7	125	#endif
28081cf8 SL	126	}
	127
	128	/*
	129	* Reset interface after UNIBUS reset.
	130	* If interface is on specified uba, reset its state.
	131	*/
	132	accreset(unit, uban)
	133	int unit, uban;
	134	{
	135	register struct uba_device *ui;
	136	struct acc_softc *sc;
	137
28081cf8 SL	138	if (unit >= NACC \|\| (ui = accinfo[unit]) == 0 \|\| ui->ui_alive == 0 \|\|
	139	ui->ui_ubanum != uban)
	140	return;
	141	printf(" acc%d", unit);
	142	sc = &acc_softc[unit];
3c238487	143	sc->acc_imp->imp_if.if_flags &= ~IFF_RUNNING;
35718d8f	144	accoflush(unit);
28081cf8	145	/* must go through IMP to allow it to set state */
3c238487	146	(*sc->acc_imp->imp_if.if_init)(sc->acc_imp->imp_if.if_unit);
28081cf8 SL	147	}
	148
	149	/*
	150	* Initialize interface: clear recorded pending operations,
a2cd4df7 BJ	151	* and retrieve, and initialize UNIBUS resources. Note
	152	* return value is used by IMP init routine to mark IMP
	153	* unavailable for outgoing traffic.
28081cf8 SL	154	*/
	155	accinit(unit)
	156	int unit;
	157	{
a2cd4df7 BJ	158	register struct acc_softc *sc;
a2cd4df7 BJ	159	register struct uba_device *ui;
28081cf8	160	register struct accdevice *addr;
7d47e8bb	161	int info;
28081cf8	162
a2cd4df7 BJ	163	if (unit >= NACC \|\| (ui = accinfo[unit]) == 0 \|\| ui->ui_alive == 0) {
	164	printf("acc%d: not alive\n", unit);
	165	return (0);
	166	}
	167	sc = &acc_softc[unit];
	168	/*
	169	* Header length is 0 since we have to passs
	170	* the IMP leader up to the protocol interpretation
	171	* routines. If we had the header length as
	172	* sizeof(struct imp_leader), then the if_ routines
	173	* would asssume we handle it on input and output.
	174	*/
3c238487 MK	175	if ((sc->acc_imp->imp_if.if_flags & IFF_RUNNING) == 0 &&
	176	if_ubainit(&sc->acc_ifuba, ui->ui_ubanum, 0,
	177	(int)btoc(IMP_RCVBUF)) == 0) {
28081cf8	178	printf("acc%d: can't initialize\n", unit);
3c238487	179	sc->acc_imp->imp_if.if_flags &= ~(IFF_UP \| IFF_RUNNING);
7dfb87a5	180	return (0);
28081cf8	181	}
3c238487	182	sc->acc_imp->imp_if.if_flags \|= IFF_RUNNING;
28081cf8 SL	183	addr = (struct accdevice *)ui->ui_addr;
28081cf8 SL	184
a0b7c7fb	185	/*
a2cd4df7 BJ	186	* Reset the imp interface;
a2cd4df7 BJ	187	* the delays are pure guesswork.
a0b7c7fb	188	*/
a2cd4df7	189	addr->ocsr = ACC_RESET; DELAY(5000);
8129679e	190	addr->ocsr = OUT_BBACK; DELAY(5000); /* reset host master ready */
a2cd4df7	191	addr->ocsr = 0;
7dfb87a5 SL	192	if (accinputreset(addr, unit) == 0) {
	193	ui->ui_alive = 0;
	194	return (0);
a2cd4df7	195	}
28081cf8 SL	196
	197	/*
	198	* Put up a read. We can't restart any outstanding writes
	199	* until we're back in synch with the IMP (i.e. we've flushed
	200	* the NOOPs it throws at us).
3c238487	201	* Note: IMP_RCVBUF includes the leader.
28081cf8	202	*/
28081cf8	203	info = sc->acc_ifuba.ifu_r.ifrw_info;
a2cd4df7	204	addr->iba = (u_short)info;
3c238487	205	addr->iwc = -((IMP_RCVBUF) >> 1);
a2cd4df7 BJ	206	#ifdef LOOPBACK
	207	addr->ocsr \|= OUT_BBACK;
	208	#endif
	209	addr->icsr =
28081cf8	210	IN_MRDY \| ACC_IE \| IN_WEN \| ((info & 0x30000) >> 12) \| ACC_GO;
a2cd4df7	211	return (1);
28081cf8 SL	212	}
28081cf8 SL	213
7dfb87a5 SL	214	accinputreset(addr, unit)
	215	register struct accdevice *addr;
	216	register int unit;
	217	{
	218	register int i;
	219
	220	addr->icsr = ACC_RESET; DELAY(5000);
	221	addr->icsr = IN_MRDY \| IN_WEN; /* close the relay */
	222	DELAY(10000);
	223	/* YECH!!! */
	224	for (i = 0; i < 500; i++) {
	225	if ((addr->icsr & IN_HRDY) \|\|
	226	(addr->icsr & (IN_RMR \| IN_IMPBSY)) == 0)
	227	return (1);
	228	addr->icsr = IN_MRDY \| IN_WEN; DELAY(10000);
	229	/* keep turning IN_RMR off */
	230	}
	231	printf("acc%d: imp doesn't respond, icsr=%b\n", unit,
	232	addr->icsr, ACC_INBITS);
	233	return (0);
	234	}
	235
3c238487 MK	236	/*
	237	* Drop the host ready line to mark host down.
	238	*/
	239	accdown(unit)
	240	int unit;
	241	{
	242	register struct accdevice *addr;
	243
	244	addr = (struct accdevice *)(accinfo[unit]->ui_addr);
	245	addr->ocsr = ACC_RESET;
	246	DELAY(5000);
	247	addr->ocsr = OUT_BBACK; /* reset host master ready */
35718d8f	248	accoflush(unit);
3c238487 MK	249	return (1);
	250	}
	251
35718d8f MK	252	accoflush(unit)
	253	int unit;
	254	{
	255	register struct acc_softc *sc = &acc_softc[unit];
	256
	257	sc->acc_imp->imp_cb.ic_oactive = 0;
	258	if (sc->acc_ifuba.ifu_xtofree) {
	259	m_freem(sc->acc_ifuba.ifu_xtofree);
	260	sc->acc_ifuba.ifu_xtofree = 0;
	261	}
	262	}
	263
28081cf8 SL	264	/*
	265	* Start output on an interface.
	266	*/
3c238487 MK	267	accoutput(unit, m)
	268	int unit;
	269	struct mbuf *m;
28081cf8	270	{
3c238487	271	int info;
28081cf8 SL	272	register struct acc_softc *sc = &acc_softc[unit];
28081cf8 SL	273	register struct accdevice *addr;
28081cf8 SL	274	u_short cmd;
28081cf8 SL	275
28081cf8	276	sc->acc_olen = if_wubaput(&sc->acc_ifuba, m);
28081cf8	277	/*
a2cd4df7 BJ	278	* Have request mapped to UNIBUS for
a2cd4df7 BJ	279	* transmission; start the output.
28081cf8	280	*/
a2cd4df7 BJ	281	if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP)
a2cd4df7 BJ	282	UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_w.ifrw_bdp);
bcb5db7d	283	addr = (struct accdevice *)accinfo[unit]->ui_addr;
28081cf8	284	info = sc->acc_ifuba.ifu_w.ifrw_info;
a2cd4df7 BJ	285	addr->oba = (u_short)info;
a2cd4df7 BJ	286	addr->owc = -((sc->acc_olen + 1) >> 1);
28081cf8	287	cmd = ACC_IE \| OUT_ENLB \| ((info & 0x30000) >> 12) \| ACC_GO;
a2cd4df7 BJ	288	#ifdef LOOPBACK
	289	cmd \|= OUT_BBACK;
	290	#endif
	291	addr->ocsr = cmd;
3c238487	292	sc->acc_imp->imp_cb.ic_oactive = 1;
28081cf8 SL	293	}
	294
	295	/*
	296	* Output interrupt handler.
	297	*/
	298	accxint(unit)
d2cc167c	299	int unit;
28081cf8	300	{
28081cf8 SL	301	register struct acc_softc *sc = &acc_softc[unit];
	302	register struct accdevice *addr;
	303
7dfb87a5	304	addr = (struct accdevice *)accinfo[unit]->ui_addr;
3c238487	305	if (sc->acc_imp->imp_cb.ic_oactive == 0) {
7dfb87a5 SL	306	printf("acc%d: stray xmit interrupt, csr=%b\n", unit,
7dfb87a5 SL	307	addr->ocsr, ACC_OUTBITS);
28081cf8 SL	308	return;
28081cf8 SL	309	}
3c238487 MK	310	sc->acc_imp->imp_if.if_opackets++;
3c238487 MK	311	sc->acc_imp->imp_cb.ic_oactive = 0;
7dd4b7cb	312	if (addr->ocsr & ACC_ERR) {
7dfb87a5 SL	313	printf("acc%d: output error, ocsr=%b, icsr=%b\n", unit,
7dfb87a5 SL	314	addr->ocsr, ACC_OUTBITS, addr->icsr, ACC_INBITS);
3c238487	315	sc->acc_imp->imp_if.if_oerrors++;
a0b7c7fb	316	}
a2cd4df7 BJ	317	if (sc->acc_ifuba.ifu_xtofree) {
	318	m_freem(sc->acc_ifuba.ifu_xtofree);
	319	sc->acc_ifuba.ifu_xtofree = 0;
28081cf8	320	}
3c238487	321	impstart(sc->acc_imp);
28081cf8 SL	322	}
	323
	324	/*
	325	* Input interrupt handler
	326	*/
	327	accrint(unit)
d2cc167c	328	int unit;
28081cf8 SL	329	{
	330	register struct acc_softc *sc = &acc_softc[unit];
	331	register struct accdevice *addr;
28081cf8 SL	332	struct mbuf *m;
	333	int len, info;
	334
7dfb87a5	335	addr = (struct accdevice *)accinfo[unit]->ui_addr;
3c238487	336	sc->acc_imp->imp_if.if_ipackets++;
28081cf8 SL	337
	338	/*
	339	* Purge BDP; flush message if error indicated.
	340	*/
a2cd4df7 BJ	341	if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP)
a2cd4df7 BJ	342	UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_r.ifrw_bdp);
7dd4b7cb	343	if (addr->icsr & ACC_ERR) {
b690198c SL	344	printf("acc%d: input error, csr=%b\n", unit,
b690198c SL	345	addr->icsr, ACC_INBITS);
3c238487	346	sc->acc_imp->imp_if.if_ierrors++;
28081cf8 SL	347	sc->acc_flush = 1;
	348	}
	349
	350	if (sc->acc_flush) {
a2cd4df7	351	if (addr->icsr & IN_EOM)
28081cf8 SL	352	sc->acc_flush = 0;
	353	goto setup;
	354	}
3c238487 MK	355	len = IMP_RCVBUF + (addr->iwc << 1);
3c238487 MK	356	if (len < 0 \|\| len > IMP_RCVBUF) {
45ee3013	357	printf("acc%d: bad length=%d\n", unit, len);
3c238487	358	sc->acc_imp->imp_if.if_ierrors++;
a2cd4df7 BJ	359	goto setup;
a2cd4df7 BJ	360	}
28081cf8 SL	361
28081cf8 SL	362	/*
fd4d8418	363	* The offset parameter is always 0 since using
28081cf8 SL	364	* trailers on the ARPAnet is insane.
28081cf8 SL	365	*/
3c238487	366	m = if_rubaget(&sc->acc_ifuba, len, 0, &sc->acc_imp->imp_if);
28081cf8 SL	367	if (m == 0)
28081cf8 SL	368	goto setup;
a2cd4df7	369	if ((addr->icsr & IN_EOM) == 0) {
a0b7c7fb	370	if (sc->acc_iq)
28081cf8	371	m_cat(sc->acc_iq, m);
a0b7c7fb	372	else
28081cf8	373	sc->acc_iq = m;
28081cf8 SL	374	goto setup;
28081cf8 SL	375	}
a0b7c7fb	376	if (sc->acc_iq) {
28081cf8 SL	377	m_cat(sc->acc_iq, m);
	378	m = sc->acc_iq;
	379	sc->acc_iq = 0;
28081cf8 SL	380	}
	381	impinput(unit, m);
	382
	383	setup:
	384	/*
	385	* Setup for next message.
	386	*/
	387	info = sc->acc_ifuba.ifu_r.ifrw_info;
a2cd4df7	388	addr->iba = (u_short)info;
3c238487	389	addr->iwc = -((IMP_RCVBUF)>> 1);
a2cd4df7	390	addr->icsr =
28081cf8 SL	391	IN_MRDY \| ACC_IE \| IN_WEN \| ((info & 0x30000) >> 12) \| ACC_GO;
	392	}
	393	#endif