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1.1 root 1: /* if_css.c 6.1 83/07/29 */
2:
3: #include "css.h"
4:
5: /*
6: * DEC/CSS IMP11-A ARPAnet IMP interface driver.
7: * Since "imp11a" is such a mouthful, it is called
8: * "css" after the LH/DH being called "acc".
9: *
10: * Configuration notes:
11: *
12: * As delivered from DEC/CSS, it
13: * is addressed and vectored as two DR11-B's. This makes
14: * Autoconfig almost IMPOSSIBLE. To make it work, the
15: * interrupt vectors must be restrapped to make the vectors
16: * consecutive. The 020 hole between the CSR addresses is
17: * tolerated, althought that could be cleaned-up also.
18: *
19: * Additionally, the TRANSMIT side of the IMP11-A has the
20: * lower address of the two subunits, so the vector ordering
21: * in the CONFIG file is reversed from most other devices.
22: * It should be:
23: *
24: * device css0 .... cssxint cssrint
25: *
26: * If you get it wrong, it will still autoconfig, but will just
27: * sit there with RECIEVE IDLE indicated on the front panel.
28: */
29: #include "../machine/pte.h"
30:
31: #include "../h/param.h"
32: #include "../h/systm.h"
33: #include "../h/mbuf.h"
34: #include "../h/buf.h"
35: #include "../h/protosw.h"
36: #include "../h/socket.h"
37: #include "../h/vmmac.h"
38:
39: #include "../net/if.h"
40: #include "../netimp/if_imp.h"
41:
42: #include "../vax/cpu.h"
43: #include "../vax/mtpr.h"
44: #include "../vaxif/if_cssreg.h"
45: #include "../vaxif/if_uba.h"
46: #include "../vaxuba/ubareg.h"
47: #include "../vaxuba/ubavar.h"
48:
49: int cssprobe(), cssattach(), cssrint(), cssxint();
50: struct uba_device *cssinfo[NCSS];
51: u_short cssstd[] = { 0 };
52: struct uba_driver cssdriver =
53: { cssprobe, 0, cssattach, 0, cssstd, "css", cssinfo };
54: #define CSSUNIT(x) minor(x)
55:
56: int cssinit(), cssstart(), cssreset();
57:
58: /*
59: * "Lower half" of IMP interface driver.
60: *
61: * Each IMP interface is handled by a common module which handles
62: * the IMP-host protocol and a hardware driver which manages the
63: * hardware specific details of talking with the IMP.
64: *
65: * The hardware portion of the IMP driver handles DMA and related
66: * management of UNIBUS resources. The IMP protocol module interprets
67: * contents of these messages and "controls" the actions of the
68: * hardware module during IMP resets, but not, for instance, during
69: * UNIBUS resets.
70: *
71: * The two modules are coupled at "attach time", and ever after,
72: * through the imp interface structure. Higher level protocols,
73: * e.g. IP, interact with the IMP driver, rather than the CSS.
74: */
75: struct css_softc {
76: struct ifnet *css_if; /* pointer to IMP's ifnet struct */
77: struct impcb *css_ic; /* data structure shared with IMP */
78: struct ifuba css_ifuba; /* UNIBUS resources */
79: struct mbuf *css_iq; /* input reassembly queue */
80: short css_olen; /* size of last message sent */
81: char css_flush; /* flush remainder of message */
82: } css_softc[NCSS];
83:
84: /*
85: * Reset the IMP and cause a transmitter interrupt by
86: * performing a null DMA.
87: */
88: cssprobe(reg)
89: caddr_t reg;
90: {
91: register int br, cvec; /* r11, r10 value-result */
92: register struct cssdevice *addr = (struct cssdevice *)reg;
93:
94: #ifdef lint
95: br = 0; cvec = br; br = cvec;
96: cssrint(0); cssxint(0);
97: #endif
98:
99:
100: addr->css_icsr = CSS_CLR;
101: addr->css_ocsr = CSS_CLR;
102: DELAY(50000);
103: addr->css_icsr = 0;
104: addr->css_ocsr = 0;
105: DELAY(50000);
106:
107: addr->css_oba = 0;
108: addr->css_owc = -1;
109: addr->css_ocsr = CSS_IE | CSS_GO; /* enable interrupts */
110: DELAY(50000);
111: addr->css_ocsr = 0;
112:
113: return (1);
114: }
115:
116: /*
117: * Call the IMP module to allow it to set up its internal
118: * state, then tie the two modules together by setting up
119: * the back pointers to common data structures.
120: */
121: cssattach(ui)
122: struct uba_device *ui;
123: {
124: register struct css_softc *sc = &css_softc[ui->ui_unit];
125: register struct impcb *ip;
126: struct ifimpcb {
127: struct ifnet ifimp_if;
128: struct impcb ifimp_impcb;
129: } *ifimp;
130:
131: if ((ifimp = (struct ifimpcb *)impattach(ui, cssreset)) == 0)
132: panic("cssattach"); /* XXX */
133: sc->css_if = &ifimp->ifimp_if;
134: ip = &ifimp->ifimp_impcb;
135: sc->css_ic = ip;
136: ip->ic_init = cssinit;
137: ip->ic_start = cssstart;
138: sc->css_ifuba.ifu_flags = UBA_CANTWAIT | UBA_NEED16;
139: #ifdef notdef
140: sc->css_ifuba.ifu_flags =| UBA_NEEDBDP;
141: #endif
142: }
143:
144: /*
145: * Reset interface after UNIBUS reset.
146: * If interface is on specified uba, reset its state.
147: */
148: cssreset(unit, uban)
149: int unit, uban;
150: {
151: register struct uba_device *ui;
152: struct css_softc *sc;
153:
154: if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0 ||
155: ui->ui_ubanum != uban)
156: return;
157: printf(" css%d", unit);
158: sc = &css_softc[unit];
159: /* must go through IMP to allow it to set state */
160: (*sc->css_if->if_init)(unit);
161: }
162:
163: /*
164: * Initialize interface: clear recorded pending operations,
165: * and retrieve, and reinitialize UNIBUS resources.
166: */
167: cssinit(unit)
168: int unit;
169: {
170: register struct css_softc *sc;
171: register struct uba_device *ui;
172: register struct cssdevice *addr;
173: int x, info;
174:
175: if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0) {
176: printf("css%d: not alive\n", unit);
177: return(0);
178: }
179: sc = &css_softc[unit];
180:
181: /*
182: * Header length is 0 to if_ubainit since we have to pass
183: * the IMP leader up to the protocol interpretaion
184: * routines. If we had the deader length as
185: * sizeof(struct imp_leader), then the if_ routines
186: * would assume we handle it on input and output.
187: */
188:
189: if (if_ubainit(&sc->css_ifuba, ui->ui_ubanum, 0,(int)btoc(IMPMTU)) == 0) {
190: printf("css%d: can't initialize\n", unit);
191: ui->ui_alive = 0;
192: return(0);
193: }
194: addr = (struct cssdevice *)ui->ui_addr;
195:
196: /* reset the imp interface. */
197: x = spl5();
198: addr->css_icsr = CSS_CLR;
199: addr->css_ocsr = CSS_CLR;
200: DELAY(100);
201: addr->css_icsr = 0;
202: addr->css_ocsr = 0;
203: addr->css_icsr = IN_HRDY; /* close the relay */
204: DELAY(5000);
205: splx(x);
206:
207: /*
208: * This may hang if the imp isn't really there.
209: * Will test and verify safe operation.
210: */
211:
212: x = 500;
213: while (x-- > 0) {
214: if ((addr->css_icsr & (IN_HRDY|IN_IMPNR)) == IN_HRDY)
215: break;
216: addr->css_icsr = IN_HRDY; /* close the relay */
217: DELAY(5000);
218: }
219:
220: if (x <= 0) {
221: printf("css%d: imp doesn't respond, icsr=%b\n", unit,
222: CSS_INBITS, addr->css_icsr);
223: goto down;
224: }
225:
226: /*
227: * Put up a read. We can't restart any outstanding writes
228: * until we're back in synch with the IMP (i.e. we've flushed
229: * the NOOPs it throws at us).
230: * Note: IMPMTU includes the leader.
231: */
232:
233: x = spl5();
234: info = sc->css_ifuba.ifu_r.ifrw_info;
235: addr->css_iba = (u_short)info;
236: addr->css_iwc = -(IMPMTU >> 1);
237: addr->css_icsr =
238: IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO;
239: splx(x);
240: return(1);
241:
242: down:
243: ui->ui_alive = 0;
244: return(0);
245: }
246:
247: /*
248: * Start output on an interface.
249: */
250: cssstart(dev)
251: dev_t dev;
252: {
253: int unit = CSSUNIT(dev), info;
254: struct uba_device *ui = cssinfo[unit];
255: register struct css_softc *sc = &css_softc[unit];
256: register struct cssdevice *addr;
257: struct mbuf *m;
258: u_short cmd;
259:
260: if (sc->css_ic->ic_oactive)
261: goto restart;
262:
263: /*
264: * Not already active, deqeue a request and
265: * map it onto the UNIBUS. If no more
266: * requeusts, just return.
267: */
268: IF_DEQUEUE(&sc->css_if->if_snd, m);
269: if (m == 0) {
270: sc->css_ic->ic_oactive = 0;
271: return;
272: }
273: sc->css_olen = if_wubaput(&sc->css_ifuba, m);
274:
275: restart:
276: /*
277: * Have request mapped to UNIBUS for transmission.
278: * Purge any stale data from the BDP, and start the output.
279: */
280: if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
281: UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_w.ifrw_bdp);
282: addr = (struct cssdevice *)ui->ui_addr;
283: info = sc->css_ifuba.ifu_w.ifrw_info;
284: addr->css_oba = (u_short)info;
285: addr->css_owc = -((sc->css_olen + 1) >> 1);
286: cmd = CSS_IE | OUT_ENLB | ((info & 0x30000) >> 12) | CSS_GO;
287: addr->css_ocsr = cmd;
288: sc->css_ic->ic_oactive = 1;
289: }
290:
291: /*
292: * Output interrupt handler.
293: */
294: cssxint(unit)
295: {
296: register struct uba_device *ui = cssinfo[unit];
297: register struct css_softc *sc = &css_softc[unit];
298: register struct cssdevice *addr;
299:
300: addr = (struct cssdevice *)ui->ui_addr;
301: if (sc->css_ic->ic_oactive == 0) {
302: printf("css%d: stray output interrupt csr=%b\n",
303: unit, addr->css_ocsr, CSS_OUTBITS);
304: return;
305: }
306: sc->css_if->if_opackets++;
307: sc->css_ic->ic_oactive = 0;
308: if (addr->css_ocsr & CSS_ERR){
309: sc->css_if->if_oerrors++;
310: printf("css%d: output error, ocsr=%b icsr=%b\n", unit,
311: addr->css_ocsr, CSS_OUTBITS,
312: addr->css_icsr, CSS_INBITS);
313: }
314: if (sc->css_ifuba.ifu_xtofree) {
315: m_freem(sc->css_ifuba.ifu_xtofree);
316: sc->css_ifuba.ifu_xtofree = 0;
317: }
318: if (sc->css_if->if_snd.ifq_head)
319: cssstart(unit);
320: }
321:
322: /*
323: * Input interrupt handler
324: */
325: cssrint(unit)
326: {
327: register struct css_softc *sc = &css_softc[unit];
328: register struct cssdevice *addr;
329: struct mbuf *m;
330: int len, info;
331:
332: sc->css_if->if_ipackets++;
333:
334: /*
335: * Purge BDP; flush message if error indicated.
336: */
337:
338: addr = (struct cssdevice *)cssinfo[unit]->ui_addr;
339: if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
340: UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_r.ifrw_bdp);
341: if (addr->css_icsr & CSS_ERR) {
342: printf("css%d: recv error, csr=%b\n", unit,
343: addr->css_icsr, CSS_INBITS);
344: sc->css_if->if_ierrors++;
345: sc->css_flush = 1;
346: }
347:
348: if (sc->css_flush) {
349: if (addr->css_icsr & IN_EOM)
350: sc->css_flush = 0;
351: goto setup;
352: }
353:
354: len = IMPMTU + (addr->css_iwc << 1);
355: if (len < 0 || len > IMPMTU) {
356: printf("css%d: bad length=%d\n", len);
357: sc->css_if->if_ierrors++;
358: goto setup;
359: }
360:
361: /*
362: * The last parameter is always 0 since using
363: * trailers on the ARPAnet is insane.
364: */
365: m = if_rubaget(&sc->css_ifuba, len, 0);
366: if (m == 0)
367: goto setup;
368: if ((addr->css_icsr & IN_EOM) == 0) {
369: if (sc->css_iq)
370: m_cat(sc->css_iq, m);
371: else
372: sc->css_iq = m;
373: goto setup;
374: }
375: if (sc->css_iq) {
376: m_cat(sc->css_iq, m);
377: m = sc->css_iq;
378: sc->css_iq = 0;
379: }
380: impinput(unit, m);
381:
382: setup:
383: /*
384: * Setup for next message.
385: */
386: info = sc->css_ifuba.ifu_r.ifrw_info;
387: addr->css_iba = (u_short)info;
388: addr->css_iwc = - (IMPMTU >> 1);
389: addr->css_icsr =
390: IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO;
391: }
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