![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to if_acc.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [CSRG BSD Unix] / 42BSD / sys / vaxif|
Return to if_acc.c CVS log | Up to [CSRG BSD Unix] / 42BSD / sys / vaxif |
1.1 root 1: /* if_acc.c 6.1 83/07/29 */
2:
3: #include "acc.h"
4: #ifdef NACC > 0
5:
6: /*
7: * ACC LH/DH ARPAnet IMP interface driver.
8: */
9: #include "../machine/pte.h"
10:
11: #include "../h/param.h"
12: #include "../h/systm.h"
13: #include "../h/mbuf.h"
14: #include "../h/buf.h"
15: #include "../h/protosw.h"
16: #include "../h/socket.h"
17: #include "../h/vmmac.h"
18:
19: #include "../net/if.h"
20: #include "../netimp/if_imp.h"
21:
22: #include "../vax/cpu.h"
23: #include "../vax/mtpr.h"
24: #include "../vaxif/if_accreg.h"
25: #include "../vaxif/if_uba.h"
26: #include "../vaxuba/ubareg.h"
27: #include "../vaxuba/ubavar.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: } 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: #ifdef lint
75: br = 0; cvec = br; br = cvec;
76: accrint(0); accxint(0);
77: #endif
78: addr->icsr = ACC_RESET; DELAY(5000);
79: addr->ocsr = ACC_RESET; DELAY(5000);
80: addr->ocsr = OUT_BBACK; DELAY(5000);
81: addr->owc = 0;
82: addr->ocsr = ACC_IE | ACC_GO; DELAY(5000);
83: addr->ocsr = 0;
84: if (cvec && cvec != 0x200) /* transmit -> receive */
85: cvec -= 4;
86: return (1);
87: }
88:
89: /*
90: * Call the IMP module to allow it to set up its internal
91: * state, then tie the two modules together by setting up
92: * the back pointers to common data structures.
93: */
94: accattach(ui)
95: struct uba_device *ui;
96: {
97: register struct acc_softc *sc = &acc_softc[ui->ui_unit];
98: register struct impcb *ip;
99: struct ifimpcb {
100: struct ifnet ifimp_if;
101: struct impcb ifimp_impcb;
102: } *ifimp;
103:
104: if ((ifimp = (struct ifimpcb *)impattach(ui, accreset)) == 0)
105: panic("accattach");
106: sc->acc_if = &ifimp->ifimp_if;
107: ip = &ifimp->ifimp_impcb;
108: sc->acc_ic = ip;
109: ip->ic_init = accinit;
110: ip->ic_start = accstart;
111: sc->acc_ifuba.ifu_flags = UBA_CANTWAIT;
112: #ifdef notdef
113: sc->acc_ifuba.ifu_flags |= UBA_NEEDBDP;
114: #endif
115: }
116:
117: /*
118: * Reset interface after UNIBUS reset.
119: * If interface is on specified uba, reset its state.
120: */
121: accreset(unit, uban)
122: int unit, uban;
123: {
124: register struct uba_device *ui;
125: struct acc_softc *sc;
126:
127: if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0 ||
128: ui->ui_ubanum != uban)
129: return;
130: printf(" acc%d", unit);
131: sc = &acc_softc[unit];
132: /* must go through IMP to allow it to set state */
133: (*sc->acc_if->if_init)(unit);
134: }
135:
136: /*
137: * Initialize interface: clear recorded pending operations,
138: * and retrieve, and initialize UNIBUS resources. Note
139: * return value is used by IMP init routine to mark IMP
140: * unavailable for outgoing traffic.
141: */
142: accinit(unit)
143: int unit;
144: {
145: register struct acc_softc *sc;
146: register struct uba_device *ui;
147: register struct accdevice *addr;
148: int info;
149:
150: if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0) {
151: printf("acc%d: not alive\n", unit);
152: return (0);
153: }
154: sc = &acc_softc[unit];
155: /*
156: * Header length is 0 since we have to passs
157: * the IMP leader up to the protocol interpretation
158: * routines. If we had the header length as
159: * sizeof(struct imp_leader), then the if_ routines
160: * would asssume we handle it on input and output.
161: */
162: if (if_ubainit(&sc->acc_ifuba, ui->ui_ubanum, 0,
163: (int)btoc(IMPMTU)) == 0) {
164: printf("acc%d: can't initialize\n", unit);
165: ui->ui_alive = 0;
166: return (0);
167: }
168: addr = (struct accdevice *)ui->ui_addr;
169:
170: /*
171: * Reset the imp interface;
172: * the delays are pure guesswork.
173: */
174: addr->ocsr = ACC_RESET; DELAY(5000);
175: addr->ocsr = OUT_BBACK; DELAY(5000); /* reset host master ready */
176: addr->ocsr = 0;
177: if (accinputreset(addr, unit) == 0) {
178: ui->ui_alive = 0;
179: return (0);
180: }
181:
182: /*
183: * Put up a read. We can't restart any outstanding writes
184: * until we're back in synch with the IMP (i.e. we've flushed
185: * the NOOPs it throws at us).
186: * Note: IMPMTU includes the leader.
187: */
188: info = sc->acc_ifuba.ifu_r.ifrw_info;
189: addr->iba = (u_short)info;
190: addr->iwc = -(IMPMTU >> 1);
191: #ifdef LOOPBACK
192: addr->ocsr |= OUT_BBACK;
193: #endif
194: addr->icsr =
195: IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO;
196: return (1);
197: }
198:
199: accinputreset(addr, unit)
200: register struct accdevice *addr;
201: register int unit;
202: {
203: register int i;
204:
205: addr->icsr = ACC_RESET; DELAY(5000);
206: addr->icsr = IN_MRDY | IN_WEN; /* close the relay */
207: DELAY(10000);
208: /* YECH!!! */
209: for (i = 0; i < 500; i++) {
210: if ((addr->icsr & IN_HRDY) ||
211: (addr->icsr & (IN_RMR | IN_IMPBSY)) == 0)
212: return (1);
213: addr->icsr = IN_MRDY | IN_WEN; DELAY(10000);
214: /* keep turning IN_RMR off */
215: }
216: printf("acc%d: imp doesn't respond, icsr=%b\n", unit,
217: addr->icsr, ACC_INBITS);
218: return (0);
219: }
220:
221: /*
222: * Start output on an interface.
223: */
224: accstart(dev)
225: dev_t dev;
226: {
227: int unit = ACCUNIT(dev), info;
228: register struct acc_softc *sc = &acc_softc[unit];
229: register struct accdevice *addr;
230: struct mbuf *m;
231: u_short cmd;
232:
233: if (sc->acc_ic->ic_oactive)
234: goto restart;
235:
236: /*
237: * Not already active, deqeue a request and
238: * map it onto the UNIBUS. If no more
239: * requeusts, just return.
240: */
241: IF_DEQUEUE(&sc->acc_if->if_snd, m);
242: if (m == 0) {
243: sc->acc_ic->ic_oactive = 0;
244: return;
245: }
246: sc->acc_olen = if_wubaput(&sc->acc_ifuba, m);
247:
248: restart:
249: /*
250: * Have request mapped to UNIBUS for
251: * transmission; start the output.
252: */
253: if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP)
254: UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_w.ifrw_bdp);
255: addr = (struct accdevice *)accinfo[unit]->ui_addr;
256: info = sc->acc_ifuba.ifu_w.ifrw_info;
257: addr->oba = (u_short)info;
258: addr->owc = -((sc->acc_olen + 1) >> 1);
259: cmd = ACC_IE | OUT_ENLB | ((info & 0x30000) >> 12) | ACC_GO;
260: #ifdef LOOPBACK
261: cmd |= OUT_BBACK;
262: #endif
263: addr->ocsr = cmd;
264: sc->acc_ic->ic_oactive = 1;
265: }
266:
267: /*
268: * Output interrupt handler.
269: */
270: accxint(unit)
271: int unit;
272: {
273: register struct acc_softc *sc = &acc_softc[unit];
274: register struct accdevice *addr;
275:
276: addr = (struct accdevice *)accinfo[unit]->ui_addr;
277: if (sc->acc_ic->ic_oactive == 0) {
278: printf("acc%d: stray xmit interrupt, csr=%b\n", unit,
279: addr->ocsr, ACC_OUTBITS);
280: return;
281: }
282: sc->acc_if->if_opackets++;
283: sc->acc_ic->ic_oactive = 0;
284: if (addr->ocsr & ACC_ERR) {
285: printf("acc%d: output error, ocsr=%b, icsr=%b\n", unit,
286: addr->ocsr, ACC_OUTBITS, addr->icsr, ACC_INBITS);
287: sc->acc_if->if_oerrors++;
288: }
289: if (sc->acc_ifuba.ifu_xtofree) {
290: m_freem(sc->acc_ifuba.ifu_xtofree);
291: sc->acc_ifuba.ifu_xtofree = 0;
292: }
293: if (sc->acc_if->if_snd.ifq_head)
294: accstart(unit);
295: }
296:
297: /*
298: * Input interrupt handler
299: */
300: accrint(unit)
301: int unit;
302: {
303: register struct acc_softc *sc = &acc_softc[unit];
304: register struct accdevice *addr;
305: struct mbuf *m;
306: int len, info;
307:
308: addr = (struct accdevice *)accinfo[unit]->ui_addr;
309: sc->acc_if->if_ipackets++;
310:
311: /*
312: * Purge BDP; flush message if error indicated.
313: */
314: if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP)
315: UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_r.ifrw_bdp);
316: if (addr->icsr & ACC_ERR) {
317: printf("acc%d: input error, csr=%b\n", unit,
318: addr->icsr, ACC_INBITS);
319: sc->acc_if->if_ierrors++;
320: sc->acc_flush = 1;
321: }
322:
323: if (sc->acc_flush) {
324: if (addr->icsr & IN_EOM)
325: sc->acc_flush = 0;
326: goto setup;
327: }
328: len = IMPMTU + (addr->iwc << 1);
329: if (len < 0 || len > IMPMTU) {
330: printf("acc%d: bad length=%d\n", len);
331: sc->acc_if->if_ierrors++;
332: goto setup;
333: }
334:
335: /*
336: * The last parameter is always 0 since using
337: * trailers on the ARPAnet is insane.
338: */
339: m = if_rubaget(&sc->acc_ifuba, len, 0);
340: if (m == 0)
341: goto setup;
342: if ((addr->icsr & IN_EOM) == 0) {
343: if (sc->acc_iq)
344: m_cat(sc->acc_iq, m);
345: else
346: sc->acc_iq = m;
347: goto setup;
348: }
349: if (sc->acc_iq) {
350: m_cat(sc->acc_iq, m);
351: m = sc->acc_iq;
352: sc->acc_iq = 0;
353: }
354: impinput(unit, m);
355:
356: setup:
357: /*
358: * Setup for next message.
359: */
360: info = sc->acc_ifuba.ifu_r.ifrw_info;
361: addr->iba = (u_short)info;
362: addr->iwc = -(IMPMTU >> 1);
363: addr->icsr =
364: IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO;
365: }
366: #endif
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.