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

/*	if_acc.c	4.1	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 */
	char	acc_previous;		/* something on input queue */
} 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. */
	x = spl5();
	addr->acc_icsr = ACC_RESET;
        addr->acc_ocsr = ACC_RESET;
	addr->acc_ocsr = OUT_BBACK;	/* reset host master ready */
	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 output 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: output error, csr=%b\n", unit,
			addr->acc_ocsr, ACC_OUTBITS);
	if (sc->acc_if->if_snd.ifq_head == 0) {
		sc->acc_if->if_oerrors++;
		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_previous)
			m_cat(sc->acc_iq, m);
		else {
			sc->acc_iq = m;
			sc->acc_previous = 1;
		}
		goto setup;
	}
	/* adjust message length for padding. */
	m->m_len -= 2;
	if (sc->acc_previous) {
		m_cat(sc->acc_iq, m);
		m = sc->acc_iq;
		sc->acc_iq = 0;
		sc->acc_previous = 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
28081cf8 SL	1	/* if_acc.c 4.1 82/02/01 */
	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 */
	62	char acc_previous; /* something on input queue */
	63	} acc_softc[NACC];
	64
65	/*
66	* Reset the IMP and cause a transmitter interrupt by
67	* performing a null DMA.
68	*/
69	accprobe(reg)
70	caddr_t reg;
71	{
72	register int br, cvec; /* r11, r10 value-result */
73	register struct accdevice addr = (struct accdevice )reg;
74
75	COUNT(ACCPROBE);
76	#ifdef lint
77	br = 0; cvec = br; br = cvec;
78	accrint(0); accxint(0);
79	#endif
80	addr->acc_icsr = ACC_RESET;
81	DELAY(500000);
82	addr->acc_ocsr = ACC_RESET;
83	DELAY(500000);
84
85	addr->acc_ocsr = OUT_BBACK;
86	DELAY(500000);
87	addr->acc_owc = 0;
88	addr->acc_ocsr = ACC_IE \| ACC_GO;
89	DELAY(500000);
90	addr->acc_ocsr = 0;
91	/* interrupt was for transmit, push back to receive vector */
92	if (cvec && cvec != 0x200)
93	cvec -= 4;
94	return (1);
95	}
96
97	/*
98	* Call the IMP module to allow it to set up its internal
99	* state, then tie the two modules together by setting up
100	* the back pointers to common data structures.
101	*/
102	accattach(ui)
103	struct uba_device *ui;
104	{
105	register struct acc_softc *sc = &acc_softc[ui->ui_unit];
106	register struct impcb *ip;
107	struct ifimpcb {
108	struct ifnet ifimp_if;
109	struct impcb ifimp_impcb;
110	} *ifimp;
111
112	COUNT(ACCATTACH);
113	if ((ifimp = (struct ifimpcb *)impattach(ui)) == 0)
114	panic("accattach"); /* XXX */
115	sc->acc_if = &ifimp->ifimp_if;
116	ip = &ifimp->ifimp_impcb;
117	sc->acc_ic = ip;
118	ip->ic_init = accinit;
119	ip->ic_start = accstart;
120	}
121
122	/*
123	* Reset interface after UNIBUS reset.
124	* If interface is on specified uba, reset its state.
125	*/
126	accreset(unit, uban)
127	int unit, uban;
128	{
129	register struct uba_device *ui;
130	struct acc_softc *sc;
131
132	COUNT(ACCRESET);
133	if (unit >= NACC \|\| (ui = accinfo[unit]) == 0 \|\| ui->ui_alive == 0 \|\|
134	ui->ui_ubanum != uban)
135	return;
136	printf(" acc%d", unit);
137	sc = &acc_softc[unit];
138	/* must go through IMP to allow it to set state */
139	(*sc->acc_if->if_init)(unit);
140	}
141
142	/*
143	* Initialize interface: clear recorded pending operations,
144	* and retrieve, and reinitialize UNIBUS resources.
145	*/
146	accinit(unit)
147	int unit;
148	{
149	register struct acc_softc *sc = &acc_softc[unit];
150	register struct uba_device *ui = accinfo[unit];
151	register struct accdevice *addr;
152	int x, info;
153
154	COUNT(ACCINIT);
155	if (if_ubainit(&sc->acc_ifuba, ui->ui_ubanum,
156	sizeof(struct imp_leader), (int)btop(IMP_MTU)) == 0) {
157	printf("acc%d: can't initialize\n", unit);
158	return;
159	}
160	addr = (struct accdevice *)ui->ui_addr;
161
162	/* reset the imp interface. */
163	x = spl5();
164	addr->acc_icsr = ACC_RESET;
165	addr->acc_ocsr = ACC_RESET;
166	addr->acc_ocsr = OUT_BBACK; /* reset host master ready */
167	addr->acc_ocsr = 0;
168	addr->acc_icsr = IN_MRDY; /* close the relay */
169	splx(x);
170
171	/* YECH!!! */
172	while ((addr->acc_icsr & IN_HRDY) == 0 \|\|
173	(addr->acc_icsr & (IN_RMR \| IN_IMPBSY))) {
174	/* keep turning IN_RMR off */
175	addr->acc_icsr = IN_MRDY;
176	sleep((caddr_t)&lbolt, PZERO);
177	}
178
179	/*
180	* Put up a read. We can't restart any outstanding writes
181	* until we're back in synch with the IMP (i.e. we've flushed
182	* the NOOPs it throws at us).
183	*/
184	x = spl5();
185	info = sc->acc_ifuba.ifu_r.ifrw_info;
186	addr->acc_iba = (u_short)info;
187	addr->acc_iwc = -(sizeof(struct imp_leader) + IMP_MTU) >> 1;
188	addr->acc_icsr =
189	IN_MRDY \| ACC_IE \| IN_WEN \| ((info & 0x30000) >> 12) \| ACC_GO;
190	splx(x);
191	}
192
193	/*
194	* Start output on an interface.
195	*/
196	accstart(dev)
197	dev_t dev;
198	{
199	int unit = ACCUNIT(dev), info;
200	struct uba_device *ui = accinfo[unit];
201	register struct acc_softc *sc = &acc_softc[unit];
202	register struct accdevice *addr;
203	struct mbuf *m;
204	u_short cmd;
205
206	COUNT(ACCSTART);
207	if (sc->acc_ic->ic_oactive)
208	goto restart;
209
210	/*
211	* Not already active, deqeue a request and
212	* map it onto the UNIBUS. If no more
213	* requeusts, just return.
214	*/
215	IF_DEQUEUE(&sc->acc_if->if_snd, m);
216	if (m == 0) {
217	sc->acc_ic->ic_oactive = 0;
218	return;
219	}
220	sc->acc_olen = if_wubaput(&sc->acc_ifuba, m);
221
222	restart:
223	/*
224	* Have request mapped to UNIBUS for transmission.
225	* Purge any stale data from the BDP, and start the output.
226	*/
227	UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_w.ifrw_bdp);
228	addr = (struct accdevice *)ui->ui_addr;
229	info = sc->acc_ifuba.ifu_w.ifrw_info;
230	addr->acc_oba = (u_short)info;
231	addr->acc_owc = -((sc->acc_olen + 1) >> 1);
232	cmd = ACC_IE \| OUT_ENLB \| ((info & 0x30000) >> 12) \| ACC_GO;
233	addr->acc_ocsr = cmd;
234	sc->acc_ic->ic_oactive = 1;
235	}
236
237	/*
238	* Output interrupt handler.
239	*/
240	accxint(unit)
241	{
242	register struct uba_device *ui = accinfo[unit];
243	register struct acc_softc *sc = &acc_softc[unit];
244	register struct accdevice *addr;
245
246	COUNT(ACCXINT);
247	if (sc->acc_ic->ic_oactive == 0) {
248	printf("acc%d: stray output interrupt\n", unit);
249	return;
250	}
251	addr = (struct accdevice *)ui->ui_addr;
252	sc->acc_if->if_opackets++;
253	sc->acc_ic->ic_oactive = 0;
254	if (addr->acc_ocsr & ACC_ERR)
255	printf("acc%d: output error, csr=%b\n", unit,
256	addr->acc_ocsr, ACC_OUTBITS);
257	if (sc->acc_if->if_snd.ifq_head == 0) {
258	sc->acc_if->if_oerrors++;
259	if (sc->acc_ifuba.ifu_xtofree) {
260	m_freem(sc->acc_ifuba.ifu_xtofree);
261	sc->acc_ifuba.ifu_xtofree = 0;
262	}
263	return;
264	}
265	accstart(unit);
266	}
267
268	/*
269	* Input interrupt handler
270	*/
271	accrint(unit)
272	{
273	register struct acc_softc *sc = &acc_softc[unit];
274	register struct accdevice *addr;
275	register struct ifqueue *inq;
276	struct mbuf *m;
277	int len, info;
278
279	COUNT(ACCRINT);
280	sc->acc_if->if_ipackets++;
281
282	/*
283	* Purge BDP; flush message if error indicated.
284	*/
285	UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_r.ifrw_bdp);
286	addr = (struct accdevice *)accinfo[unit]->ui_addr;
287	if (addr->acc_icsr & ACC_ERR) {
288	printf("acc%d: recv error, csr=%b\n", unit,
289	addr->acc_icsr, ACC_INBITS);
290	sc->acc_if->if_ierrors++;
291	sc->acc_flush = 1;
292	}
293
294	if (sc->acc_flush) {
295	if (addr->acc_icsr & IN_EOM)
296	sc->acc_flush = 0;
297	goto setup;
298	}
299	len = sizeof(struct imp_leader) + (addr->acc_iwc << 1);
300
301	/*
302	* The last parameter is always 0 since using
303	* trailers on the ARPAnet is insane.
304	*/
305	m = if_rubaget(&sc->acc_ifuba, len, 0);
306	if (m == 0)
307	goto setup;
308	if ((addr->acc_icsr & IN_EOM) == 0) {
309	if (sc->acc_previous)
310	m_cat(sc->acc_iq, m);
311	else {
312	sc->acc_iq = m;
313	sc->acc_previous = 1;
314	}
315	goto setup;
316	}
317	/* adjust message length for padding. */
318	m->m_len -= 2;
319	if (sc->acc_previous) {
320	m_cat(sc->acc_iq, m);
321	m = sc->acc_iq;
322	sc->acc_iq = 0;
323	sc->acc_previous = 0;
324	}
325	impinput(unit, m);
326
327	setup:
328	/*
329	* Setup for next message.
330	*/
331	info = sc->acc_ifuba.ifu_r.ifrw_info;
332	addr->acc_iba = (u_short)info;
333	addr->acc_iwc = - (sizeof(struct imp_leader) + IMP_MTU) >> 1;
334	addr->acc_icsr =
335	IN_MRDY \| ACC_IE \| IN_WEN \| ((info & 0x30000) >> 12) \| ACC_GO;
336	}
337	#endif