[unix-history] / usr / src / sys / vax / if / if_acc.c

/*	if_acc.c	4.2	82/02/01	*/

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

/*
 * ACC LH/DH ARPAnet IMP interface driver.
 */

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/mbuf.h"
#include "../h/pte.h"
#include "../h/buf.h"
#include "../h/protosw.h"
#include "../h/socket.h"
#include "../h/ubareg.h"
#include "../h/ubavar.h"
#include "../h/accreg.h"
#include "../h/cpu.h"
#include "../h/mtpr.h"
#include "../h/vmmac.h"
#include "../net/in.h"
#include "../net/in_systm.h"
#include "../net/if.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;
{
	register int br, cvec;		/* r11, r10 value-result */
	register struct accdevice *addr = (struct accdevice *)reg;

COUNT(ACCPROBE);
#ifdef lint
	br = 0; cvec = br; br = cvec;
	accrint(0); accxint(0);
#endif
	addr->acc_icsr = ACC_RESET;
	DELAY(500000);
	addr->acc_ocsr = ACC_RESET;
	DELAY(500000);

	addr->acc_ocsr = OUT_BBACK;
	DELAY(500000);
	addr->acc_owc = 0;
	addr->acc_ocsr = ACC_IE | ACC_GO;
	DELAY(500000);
	addr->acc_ocsr = 0;
	/* interrupt was for transmit, push back to receive vector */
	if (cvec && cvec != 0x200)
		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)
	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;

COUNT(ACCATTACH);
	if ((ifimp = (struct ifimpcb *)impattach(ui)) == 0)
		panic("accattach");		/* XXX */
	sc->acc_if = &ifimp->ifimp_if;
	ip = &ifimp->ifimp_impcb;
	sc->acc_ic = ip;
	ip->ic_init = accinit;
	ip->ic_start = accstart;
}

/*
 * 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;

COUNT(ACCRESET);
	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 reinitialize UNIBUS resources.
 */
accinit(unit)
	int unit;
{	
	register struct acc_softc *sc = &acc_softc[unit];
	register struct uba_device *ui = accinfo[unit];
	register struct accdevice *addr;
	int x, info;

COUNT(ACCINIT);
	if (if_ubainit(&sc->acc_ifuba, ui->ui_ubanum,
	      sizeof(struct imp_leader), (int)btop(IMP_MTU)) == 0) {
		printf("acc%d: can't initialize\n", unit);
		return;
	}
	addr = (struct accdevice *)ui->ui_addr;

	/*
	 * Reset the imp interface.
	 * the delays are totally guesses
	 */
	x = spl5();
	addr->acc_icsr = ACC_RESET;
	DELAY(100);
        addr->acc_ocsr = ACC_RESET;
	DELAY(1000);
	addr->acc_ocsr = OUT_BBACK;	/* reset host master ready */
	DELAY(1000);
	addr->acc_ocsr = 0;
	addr->acc_icsr = IN_MRDY;	/* close the relay */
	splx(x);

	/* YECH!!! */
	while ((addr->acc_icsr & IN_HRDY) == 0 ||
	       (addr->acc_icsr & (IN_RMR | IN_IMPBSY))) {
		/* keep turning IN_RMR off */
		addr->acc_icsr = IN_MRDY;
		sleep((caddr_t)&lbolt, PZERO);	/* ??? */
	}

	/*
	 * 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).
	 */
	x = spl5();
	info = sc->acc_ifuba.ifu_r.ifrw_info;
	addr->acc_iba = (u_short)info;
	addr->acc_iwc = -(sizeof(struct imp_leader) + IMP_MTU) >> 1;
	addr->acc_icsr = 
		IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO;
	splx(x);
}

/*
 * Start output on an interface.
 */
accstart(dev)
	dev_t dev;
{
	int unit = ACCUNIT(dev), info;
	struct uba_device *ui = accinfo[unit];
	register struct acc_softc *sc = &acc_softc[unit];
	register struct accdevice *addr;
	struct mbuf *m;
	u_short cmd;

COUNT(ACCSTART);
	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.
	 * Purge any stale data from the BDP, and start the output.
	 */
	UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_w.ifrw_bdp);
	addr = (struct accdevice *)ui->ui_addr;
	info = sc->acc_ifuba.ifu_w.ifrw_info;
	addr->acc_oba = (u_short)info;
	addr->acc_owc = -((sc->acc_olen + 1) >> 1);
	cmd = ACC_IE | OUT_ENLB | ((info & 0x30000) >> 12) | ACC_GO;
	addr->acc_ocsr = cmd;
	sc->acc_ic->ic_oactive = 1;
}

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

COUNT(ACCXINT);
	if (sc->acc_ic->ic_oactive == 0) {
		printf("acc%d: stray send interrupt\n", unit);
		return;
	}
	addr = (struct accdevice *)ui->ui_addr;
	sc->acc_if->if_opackets++;
	sc->acc_ic->ic_oactive = 0;
	if (addr->acc_ocsr & ACC_ERR) {
		printf("acc%d: send error, csr=%b\n", unit,
			addr->acc_ocsr, ACC_OUTBITS);
		sc->acc_if->if_oerrors++;
	}
	if (sc->acc_if->if_snd.ifq_head == 0) {
		if (sc->acc_ifuba.ifu_xtofree) {
			m_freem(sc->acc_ifuba.ifu_xtofree);
			sc->acc_ifuba.ifu_xtofree = 0;
		}
		return;
	}
	accstart(unit);
}

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

COUNT(ACCRINT);
	sc->acc_if->if_ipackets++;

	/*
	 * Purge BDP; flush message if error indicated.
	 */
	UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_r.ifrw_bdp);
	addr = (struct accdevice *)accinfo[unit]->ui_addr;
	if (addr->acc_icsr & ACC_ERR) {
		printf("acc%d: recv error, csr=%b\n", unit,
		    addr->acc_icsr, ACC_INBITS);
		sc->acc_if->if_ierrors++;
		sc->acc_flush = 1;
	}

	if (sc->acc_flush) {
		if (addr->acc_icsr & IN_EOM)
			sc->acc_flush = 0;
		goto setup;
	}
	len = sizeof(struct imp_leader) + (addr->acc_iwc << 1);

	/*
	 * 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->acc_icsr & IN_EOM) == 0) {
		if (sc->acc_iq)
			m_cat(sc->acc_iq, m);
		else
			sc->acc_iq = m;
		goto setup;
	}
	/* adjust message length for padding. */
	m->m_len -= 2;
	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->acc_iba = (u_short)info;
	addr->acc_iwc = - (sizeof(struct imp_leader) + IMP_MTU) >> 1;
	addr->acc_icsr =
		IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO;
}
#endif
Commit	Line	Data
a0b7c7fb	1	/* if_acc.c 4.2 82/02/01 */
28081cf8 SL	2
	3	#include "acc.h"
	4	#ifdef NACC > 0
	5
	6	/*
	7	* ACC LH/DH ARPAnet IMP interface driver.
	8	*/
	9
	10	#include "../h/param.h"
	11	#include "../h/systm.h"
	12	#include "../h/mbuf.h"
	13	#include "../h/pte.h"
	14	#include "../h/buf.h"
	15	#include "../h/protosw.h"
	16	#include "../h/socket.h"
	17	#include "../h/ubareg.h"
	18	#include "../h/ubavar.h"
	19	#include "../h/accreg.h"
	20	#include "../h/cpu.h"
	21	#include "../h/mtpr.h"
	22	#include "../h/vmmac.h"
	23	#include "../net/in.h"
	24	#include "../net/in_systm.h"
	25	#include "../net/if.h"
	26	#include "../net/if_imp.h"
	27	#include "../net/if_uba.h"
	28
	29	int accprobe(), accattach(), accrint(), accxint();
	30	struct uba_device *accinfo[NACC];
	31	u_short accstd[] = { 0 };
	32	struct uba_driver accdriver =
	33	{ accprobe, 0, accattach, 0, accstd, "acc", accinfo };
	34	#define ACCUNIT(x) minor(x)
	35
	36	int accinit(), accstart(), accreset();
	37
	38	/*
	39	* "Lower half" of IMP interface driver.
	40	*
	41	* Each IMP interface is handled by a common module which handles
	42	* the IMP-host protocol and a hardware driver which manages the
	43	* hardware specific details of talking with the IMP.
	44	*
	45	* The hardware portion of the IMP driver handles DMA and related
	46	* management of UNIBUS resources. The IMP protocol module interprets
	47	* contents of these messages and "controls" the actions of the
	48	* hardware module during IMP resets, but not, for instance, during
	49	* UNIBUS resets.
	50	*
	51	* The two modules are coupled at "attach time", and ever after,
	52	* through the imp interface structure. Higher level protocols,
	53	* e.g. IP, interact with the IMP driver, rather than the ACC.
	54	*/
	55	struct acc_softc {
	56	struct ifnet acc_if; / pointer to IMP's ifnet struct */
	57	struct impcb acc_ic; / data structure shared with IMP */
	58	struct ifuba acc_ifuba; /* UNIBUS resources */
	59	struct mbuf acc_iq; / input reassembly queue */
	60	short acc_olen; /* size of last message sent */
	61	char acc_flush; /* flush remainder of message */
28081cf8 SL	62	} acc_softc[NACC];
	63
	64	/*
	65	* Reset the IMP and cause a transmitter interrupt by
	66	* performing a null DMA.
	67	*/
	68	accprobe(reg)
	69	caddr_t reg;
	70	{
	71	register int br, cvec; /* r11, r10 value-result */
	72	register struct accdevice addr = (struct accdevice )reg;
	73
	74	COUNT(ACCPROBE);
	75	#ifdef lint
	76	br = 0; cvec = br; br = cvec;
	77	accrint(0); accxint(0);
	78	#endif
	79	addr->acc_icsr = ACC_RESET;
	80	DELAY(500000);
	81	addr->acc_ocsr = ACC_RESET;
	82	DELAY(500000);
	83
	84	addr->acc_ocsr = OUT_BBACK;
	85	DELAY(500000);
	86	addr->acc_owc = 0;
	87	addr->acc_ocsr = ACC_IE \| ACC_GO;
	88	DELAY(500000);
	89	addr->acc_ocsr = 0;
	90	/* interrupt was for transmit, push back to receive vector */
	91	if (cvec && cvec != 0x200)
	92	cvec -= 4;
	93	return (1);
	94	}
	95
	96	/*
	97	* Call the IMP module to allow it to set up its internal
	98	* state, then tie the two modules together by setting up
	99	* the back pointers to common data structures.
	100	*/
	101	accattach(ui)
	102	struct uba_device *ui;
	103	{
	104	register struct acc_softc *sc = &acc_softc[ui->ui_unit];
	105	register struct impcb *ip;
	106	struct ifimpcb {
	107	struct ifnet ifimp_if;
	108	struct impcb ifimp_impcb;
	109	} *ifimp;
	110
	111	COUNT(ACCATTACH);
	112	if ((ifimp = (struct ifimpcb *)impattach(ui)) == 0)
	113	panic("accattach"); /* XXX */
	114	sc->acc_if = &ifimp->ifimp_if;
	115	ip = &ifimp->ifimp_impcb;
	116	sc->acc_ic = ip;
	117	ip->ic_init = accinit;
	118	ip->ic_start = accstart;
	119	}
	120
	121	/*
	122	* Reset interface after UNIBUS reset.
	123	* If interface is on specified uba, reset its state.
	124	*/
	125	accreset(unit, uban)
126	int unit, uban;
127	{
128	register struct uba_device *ui;
129	struct acc_softc *sc;
130
131	COUNT(ACCRESET);
132	if (unit >= NACC \|\| (ui = accinfo[unit]) == 0 \|\| ui->ui_alive == 0 \|\|
133	ui->ui_ubanum != uban)
134	return;
135	printf(" acc%d", unit);
136	sc = &acc_softc[unit];
137	/* must go through IMP to allow it to set state */
138	(*sc->acc_if->if_init)(unit);
139	}
140
141	/*
142	* Initialize interface: clear recorded pending operations,
143	* and retrieve, and reinitialize UNIBUS resources.
144	*/
145	accinit(unit)
146	int unit;
147	{
148	register struct acc_softc *sc = &acc_softc[unit];
149	register struct uba_device *ui = accinfo[unit];
150	register struct accdevice *addr;
151	int x, info;
152
153	COUNT(ACCINIT);
154	if (if_ubainit(&sc->acc_ifuba, ui->ui_ubanum,
155	sizeof(struct imp_leader), (int)btop(IMP_MTU)) == 0) {
156	printf("acc%d: can't initialize\n", unit);
157	return;
158	}
159	addr = (struct accdevice *)ui->ui_addr;
160
a0b7c7fb SL	161	/*
	162	* Reset the imp interface.
	163	* the delays are totally guesses
	164	*/
28081cf8 SL	165	x = spl5();
28081cf8 SL	166	addr->acc_icsr = ACC_RESET;
a0b7c7fb	167	DELAY(100);
28081cf8	168	addr->acc_ocsr = ACC_RESET;
a0b7c7fb	169	DELAY(1000);
28081cf8	170	addr->acc_ocsr = OUT_BBACK; /* reset host master ready */
a0b7c7fb	171	DELAY(1000);
28081cf8 SL	172	addr->acc_ocsr = 0;
	173	addr->acc_icsr = IN_MRDY; /* close the relay */
	174	splx(x);
	175
	176	/* YECH!!! */
	177	while ((addr->acc_icsr & IN_HRDY) == 0 \|\|
	178	(addr->acc_icsr & (IN_RMR \| IN_IMPBSY))) {
	179	/* keep turning IN_RMR off */
	180	addr->acc_icsr = IN_MRDY;
a0b7c7fb	181	sleep((caddr_t)&lbolt, PZERO); /* ??? */
28081cf8 SL	182	}
	183
	184	/*
	185	* Put up a read. We can't restart any outstanding writes
	186	* until we're back in synch with the IMP (i.e. we've flushed
	187	* the NOOPs it throws at us).
	188	*/
	189	x = spl5();
	190	info = sc->acc_ifuba.ifu_r.ifrw_info;
	191	addr->acc_iba = (u_short)info;
	192	addr->acc_iwc = -(sizeof(struct imp_leader) + IMP_MTU) >> 1;
	193	addr->acc_icsr =
	194	IN_MRDY \| ACC_IE \| IN_WEN \| ((info & 0x30000) >> 12) \| ACC_GO;
	195	splx(x);
	196	}
	197
	198	/*
	199	* Start output on an interface.
	200	*/
	201	accstart(dev)
	202	dev_t dev;
	203	{
	204	int unit = ACCUNIT(dev), info;
	205	struct uba_device *ui = accinfo[unit];
	206	register struct acc_softc *sc = &acc_softc[unit];
	207	register struct accdevice *addr;
	208	struct mbuf *m;
	209	u_short cmd;
	210
	211	COUNT(ACCSTART);
	212	if (sc->acc_ic->ic_oactive)
	213	goto restart;
	214
	215	/*
	216	* Not already active, deqeue a request and
	217	* map it onto the UNIBUS. If no more
	218	* requeusts, just return.
	219	*/
	220	IF_DEQUEUE(&sc->acc_if->if_snd, m);
	221	if (m == 0) {
	222	sc->acc_ic->ic_oactive = 0;
	223	return;
	224	}
	225	sc->acc_olen = if_wubaput(&sc->acc_ifuba, m);
	226
	227	restart:
	228	/*
	229	* Have request mapped to UNIBUS for transmission.
	230	* Purge any stale data from the BDP, and start the output.
	231	*/
	232	UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_w.ifrw_bdp);
	233	addr = (struct accdevice *)ui->ui_addr;
	234	info = sc->acc_ifuba.ifu_w.ifrw_info;
	235	addr->acc_oba = (u_short)info;
	236	addr->acc_owc = -((sc->acc_olen + 1) >> 1);
	237	cmd = ACC_IE \| OUT_ENLB \| ((info & 0x30000) >> 12) \| ACC_GO;
	238	addr->acc_ocsr = cmd;
	239	sc->acc_ic->ic_oactive = 1;
	240	}
	241
	242	/*
	243	* Output interrupt handler.
	244	*/
	245	accxint(unit)
246	{
247	register struct uba_device *ui = accinfo[unit];
248	register struct acc_softc *sc = &acc_softc[unit];
249	register struct accdevice *addr;
250
251	COUNT(ACCXINT);
252	if (sc->acc_ic->ic_oactive == 0) {
a0b7c7fb	253	printf("acc%d: stray send interrupt\n", unit);
28081cf8 SL	254	return;
	255	}
	256	addr = (struct accdevice *)ui->ui_addr;
	257	sc->acc_if->if_opackets++;
	258	sc->acc_ic->ic_oactive = 0;
a0b7c7fb SL	259	if (addr->acc_ocsr & ACC_ERR) {
a0b7c7fb SL	260	printf("acc%d: send error, csr=%b\n", unit,
28081cf8	261	addr->acc_ocsr, ACC_OUTBITS);
28081cf8	262	sc->acc_if->if_oerrors++;
a0b7c7fb SL	263	}
a0b7c7fb SL	264	if (sc->acc_if->if_snd.ifq_head == 0) {
28081cf8 SL	265	if (sc->acc_ifuba.ifu_xtofree) {
	266	m_freem(sc->acc_ifuba.ifu_xtofree);
	267	sc->acc_ifuba.ifu_xtofree = 0;
	268	}
	269	return;
	270	}
	271	accstart(unit);
	272	}
	273
	274	/*
	275	* Input interrupt handler
	276	*/
	277	accrint(unit)
	278	{
	279	register struct acc_softc *sc = &acc_softc[unit];
	280	register struct accdevice *addr;
	281	register struct ifqueue *inq;
	282	struct mbuf *m;
	283	int len, info;
	284
	285	COUNT(ACCRINT);
	286	sc->acc_if->if_ipackets++;
	287
	288	/*
	289	* Purge BDP; flush message if error indicated.
	290	*/
	291	UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_r.ifrw_bdp);
	292	addr = (struct accdevice *)accinfo[unit]->ui_addr;
	293	if (addr->acc_icsr & ACC_ERR) {
	294	printf("acc%d: recv error, csr=%b\n", unit,
	295	addr->acc_icsr, ACC_INBITS);
	296	sc->acc_if->if_ierrors++;
	297	sc->acc_flush = 1;
	298	}
	299
	300	if (sc->acc_flush) {
	301	if (addr->acc_icsr & IN_EOM)
	302	sc->acc_flush = 0;
	303	goto setup;
	304	}
	305	len = sizeof(struct imp_leader) + (addr->acc_iwc << 1);
	306
	307	/*
	308	* The last parameter is always 0 since using
	309	* trailers on the ARPAnet is insane.
	310	*/
	311	m = if_rubaget(&sc->acc_ifuba, len, 0);
	312	if (m == 0)
	313	goto setup;
	314	if ((addr->acc_icsr & IN_EOM) == 0) {
a0b7c7fb	315	if (sc->acc_iq)
28081cf8	316	m_cat(sc->acc_iq, m);
a0b7c7fb	317	else
28081cf8	318	sc->acc_iq = m;
28081cf8 SL	319	goto setup;
	320	}
	321	/* adjust message length for padding. */
	322	m->m_len -= 2;
a0b7c7fb	323	if (sc->acc_iq) {
28081cf8 SL	324	m_cat(sc->acc_iq, m);
	325	m = sc->acc_iq;
	326	sc->acc_iq = 0;
28081cf8 SL	327	}
	328	impinput(unit, m);
	329
	330	setup:
	331	/*
	332	* Setup for next message.
	333	*/
	334	info = sc->acc_ifuba.ifu_r.ifrw_info;
	335	addr->acc_iba = (u_short)info;
	336	addr->acc_iwc = - (sizeof(struct imp_leader) + IMP_MTU) >> 1;
	337	addr->acc_icsr =
	338	IN_MRDY \| ACC_IE \| IN_WEN \| ((info & 0x30000) >> 12) \| ACC_GO;
	339	}
	340	#endif