Annotation of sys/arch/hp300/dev/hpib.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: hpib.c,v 1.13 2005/11/16 21:23:55 miod Exp $ */
2: /* $NetBSD: hpib.c,v 1.16 1997/04/27 20:58:57 thorpej Exp $ */
3:
4: /*
5: * Copyright (c) 1996, 1997 Jason R. Thorpe. All rights reserved.
6: * Copyright (c) 1982, 1990, 1993
7: * The Regents of the University of California. All rights reserved.
8: *
9: * Redistribution and use in source and binary forms, with or without
10: * modification, are permitted provided that the following conditions
11: * are met:
12: * 1. Redistributions of source code must retain the above copyright
13: * notice, this list of conditions and the following disclaimer.
14: * 2. Redistributions in binary form must reproduce the above copyright
15: * notice, this list of conditions and the following disclaimer in the
16: * documentation and/or other materials provided with the distribution.
17: * 3. Neither the name of the University nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: *
33: * @(#)hpib.c 8.2 (Berkeley) 1/12/94
34: */
35:
36: /*
37: * HP-IB bus driver
38: */
39:
40: #include <sys/param.h>
41: #include <sys/systm.h>
42: #include <sys/buf.h>
43: #include <sys/malloc.h>
44: #include <sys/device.h>
45:
46: #include <hp300/dev/dmavar.h>
47:
48: #include <hp300/dev/hpibvar.h>
49:
50: #include <machine/cpu.h>
51: #include <machine/hp300spu.h>
52:
53: int hpibbusmatch(struct device *, void *, void *);
54: void hpibbusattach(struct device *, struct device *, void *);
55:
56: struct cfattach hpibbus_ca = {
57: sizeof(struct hpibbus_softc), hpibbusmatch, hpibbusattach
58: };
59:
60: struct cfdriver hpibbus_cd = {
61: NULL, "hpibbus", DV_DULL
62: };
63:
64: void hpibbus_attach_children(struct hpibbus_softc *);
65: int hpibbussubmatch(struct device *, void *, void *);
66: int hpibbusprint(void *, const char *);
67:
68: void hpibstart(void *);
69: void hpibdone(void *);
70:
71: int hpibtimeout = 100000; /* # of status tests before we give up */
72: int hpibidtimeout = 10000; /* # of status tests for hpibid() calls */
73: int hpibdmathresh = 3; /* byte count beyond which to attempt dma */
74:
75: /*
76: * HP-IB is essentially an IEEE 488 bus, with an HP command
77: * set (CS/80 on `newer' devices, Amigo on before-you-were-born
78: * devices) thrown on top. Devices that respond to CS/80 (and
79: * probably Amigo, too) are tagged with a 16-bit ID.
80: *
81: * HP-IB has a 2-level addressing scheme; slave, the analog
82: * of a SCSI ID, and punit, the analog of a SCSI LUN. Unfortunately,
83: * IDs are on a per-slave basis; punits are often used for disk
84: * drives that have an accompanying tape drive on the second punit.
85: *
86: * In addition, not all HP-IB devices speak CS/80 or Amigo.
87: * Examples of such devices are HP-IB plotters, which simply
88: * take raw plotter commands over 488. These devices do not
89: * have ID tags, and often the host cannot even tell if such
90: * a device is attached to the system!
91: *
92: * We nevertheless probe the whole (slave, punit) tuple space, since
93: * drivers for devices with a unique ID know exactly where to attach;
94: * and we disallow ``star'' locators for other drivers.
95: */
96:
97: int
98: hpibbusmatch(parent, match, aux)
99: struct device *parent;
100: void *match, *aux;
101: {
102:
103: return (1);
104: }
105:
106: void
107: hpibbusattach(parent, self, aux)
108: struct device *parent, *self;
109: void *aux;
110: {
111: struct hpibbus_softc *sc = (struct hpibbus_softc *)self;
112: struct hpibdev_attach_args *ha = aux;
113:
114: printf("\n");
115:
116: /* Get the operations vector for the controller. */
117: sc->sc_ops = ha->ha_ops;
118: sc->sc_type = ha->ha_type; /* XXX */
119: sc->sc_ba = ha->ha_ba;
120: *(ha->ha_softcpp) = sc; /* XXX */
121:
122: hpibreset(self->dv_unit); /* XXX souldn't be here */
123:
124: /*
125: * Initialize the DMA queue entry.
126: */
127: sc->sc_dq = (struct dmaqueue *)malloc(sizeof(struct dmaqueue),
128: M_DEVBUF, M_NOWAIT);
129: if (sc->sc_dq == NULL) {
130: printf("%s: can't allocate DMA queue entry\n", self->dv_xname);
131: return;
132: }
133: sc->sc_dq->dq_softc = sc;
134: sc->sc_dq->dq_start = hpibstart;
135: sc->sc_dq->dq_done = hpibdone;
136:
137: /* Initialize the slave request queue. */
138: TAILQ_INIT(&sc->sc_queue);
139:
140: /* Attach any devices on the bus. */
141: hpibbus_attach_children(sc);
142: }
143:
144: void
145: hpibbus_attach_children(sc)
146: struct hpibbus_softc *sc;
147: {
148: struct hpibbus_attach_args ha;
149: int id, slave, punit;
150: int i;
151:
152: for (slave = 0; slave < HPIB_NSLAVES; slave++) {
153: /*
154: * Get the ID tag for the device, if any.
155: * Plotters won't identify themselves, and
156: * get the same value as non-existent devices.
157: * However, aging HP-IB drives are slow to respond; try up
158: * to three times to get a valid ID.
159: */
160: for (i = 0; i < 3; i++) {
161: id = hpibid(sc->sc_dev.dv_unit, slave);
162: if ((id & 0x200) != 0)
163: break;
164: delay(10000);
165: }
166:
167: for (punit = 0; punit < HPIB_NPUNITS; punit++) {
168: /*
169: * Search through all configured children for this bus.
170: */
171: ha.ha_id = id;
172: ha.ha_slave = slave;
173: ha.ha_punit = punit;
174: (void)config_found_sm(&sc->sc_dev, &ha, hpibbusprint,
175: hpibbussubmatch);
176: }
177: }
178: }
179:
180: int
181: hpibbussubmatch(parent, match, aux)
182: struct device *parent;
183: void *match, *aux;
184: {
185: struct cfdata *cf = match;
186: struct hpibbus_attach_args *ha = aux;
187:
188: if (cf->hpibbuscf_slave != HPIBBUS_SLAVE_UNK &&
189: cf->hpibbuscf_slave != ha->ha_slave)
190: return (0);
191: if (cf->hpibbuscf_punit != HPIBBUS_PUNIT_UNK &&
192: cf->hpibbuscf_punit != ha->ha_punit)
193: return (0);
194: return ((*cf->cf_attach->ca_match)(parent, match, aux));
195: }
196:
197: int
198: hpibbusprint(aux, pnp)
199: void *aux;
200: const char *pnp;
201: {
202: struct hpibbus_attach_args *ha = aux;
203:
204: if (pnp != NULL) {
205: if (ha->ha_id == 0 || ha->ha_punit != 0 /* XXX */)
206: return (QUIET);
207: printf("HP-IB device (id %04X) at %s", ha->ha_id, pnp);
208: }
209: printf(" slave %d punit %d", ha->ha_slave, ha->ha_punit);
210: return (UNCONF);
211: }
212:
213: int
214: hpibdevprint(aux, pnp)
215: void *aux;
216: const char *pnp;
217: {
218:
219: /* only hpibbus's can attach to hpibdev's -- easy. */
220: if (pnp != NULL)
221: printf("hpibbus at %s", pnp);
222: return (UNCONF);
223: }
224:
225: void
226: hpibreset(unit)
227: int unit;
228: {
229: struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit];
230:
231: (*sc->sc_ops->hpib_reset)(sc);
232: }
233:
234: int
235: hpibreq(pdev, hq)
236: struct device *pdev;
237: struct hpibqueue *hq;
238: {
239: struct hpibbus_softc *sc = (struct hpibbus_softc *)pdev;
240: int s;
241:
242: s = splhigh(); /* XXXthorpej */
243: TAILQ_INSERT_TAIL(&sc->sc_queue, hq, hq_list);
244: splx(s);
245:
246: if (TAILQ_FIRST(&sc->sc_queue) == hq)
247: return (1);
248:
249: return (0);
250: }
251:
252: void
253: hpibfree(pdev, hq)
254: struct device *pdev;
255: struct hpibqueue *hq;
256: {
257: struct hpibbus_softc *sc = (struct hpibbus_softc *)pdev;
258: int s;
259:
260: s = splhigh(); /* XXXthorpej */
261: TAILQ_REMOVE(&sc->sc_queue, hq, hq_list);
262: splx(s);
263:
264: if ((hq = TAILQ_FIRST(&sc->sc_queue)) != NULL)
265: (*hq->hq_start)(hq->hq_softc);
266: }
267:
268: int
269: hpibid(unit, slave)
270: int unit, slave;
271: {
272: short id;
273: int ohpibtimeout;
274:
275: /*
276: * XXX shorten timeout value so autoconfig doesn't
277: * take forever on slow CPUs.
278: */
279: ohpibtimeout = hpibtimeout;
280: hpibtimeout = hpibidtimeout * (cpuspeed / 8);
281: if (hpibrecv(unit, 31, slave, &id, 2) != 2)
282: id = 0;
283: hpibtimeout = ohpibtimeout;
284: return(id);
285: }
286:
287: int
288: hpibsend(unit, slave, sec, addr, cnt)
289: int unit, slave, sec, cnt;
290: void *addr;
291: {
292: struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit];
293:
294: return ((*sc->sc_ops->hpib_send)(sc, slave, sec, addr, cnt));
295: }
296:
297: int
298: hpibrecv(unit, slave, sec, addr, cnt)
299: int unit, slave, sec, cnt;
300: void *addr;
301: {
302: struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit];
303:
304: return ((*sc->sc_ops->hpib_recv)(sc, slave, sec, addr, cnt));
305: }
306:
307: int
308: hpibpptest(unit, slave)
309: int unit;
310: int slave;
311: {
312: struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit];
313:
314: return ((*sc->sc_ops->hpib_ppoll)(sc) & (0x80 >> slave));
315: }
316:
317: void
318: hpibppclear(unit)
319: int unit;
320: {
321: struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit];
322:
323: sc->sc_flags &= ~HPIBF_PPOLL;
324: }
325:
326: void
327: hpibawait(unit)
328: int unit;
329: {
330: struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit];
331:
332: sc->sc_flags |= HPIBF_PPOLL;
333: (*sc->sc_ops->hpib_ppwatch)(sc);
334: }
335:
336: int
337: hpibswait(unit, slave)
338: int unit;
339: int slave;
340: {
341: struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit];
342: int timo = hpibtimeout;
343: int mask, (*ppoll)(struct hpibbus_softc *);
344:
345: ppoll = sc->sc_ops->hpib_ppoll;
346: mask = 0x80 >> slave;
347: while (((*ppoll)(sc) & mask) == 0) {
348: if (--timo == 0) {
349: printf("%s: swait timeout\n", sc->sc_dev.dv_xname);
350: return(-1);
351: }
352: }
353: return(0);
354: }
355:
356: int
357: hpibustart(unit)
358: int unit;
359: {
360: struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit];
361:
362: if (sc->sc_type == HPIBA)
363: sc->sc_dq->dq_chan = DMA0;
364: else
365: sc->sc_dq->dq_chan = DMA0 | DMA1;
366: if (dmareq(sc->sc_dq))
367: return(1);
368: return(0);
369: }
370:
371: void
372: hpibstart(arg)
373: void *arg;
374: {
375: struct hpibbus_softc *sc = arg;
376: struct hpibqueue *hq;
377:
378: hq = TAILQ_FIRST(&sc->sc_queue);
379: (*hq->hq_go)(hq->hq_softc);
380: }
381:
382: void
383: hpibgo(unit, slave, sec, vbuf, count, rw, timo)
384: int unit, slave, sec;
385: void *vbuf;
386: int count, rw, timo;
387: {
388: struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit];
389:
390: (*sc->sc_ops->hpib_go)(sc, slave, sec, vbuf, count, rw, timo);
391: }
392:
393: void
394: hpibdone(arg)
395: void *arg;
396: {
397: struct hpibbus_softc *sc = arg;
398:
399: (*sc->sc_ops->hpib_done)(sc);
400: }
401:
402: int
403: hpibintr(arg)
404: void *arg;
405: {
406: struct hpibbus_softc *sc = arg;
407:
408: return ((sc->sc_ops->hpib_intr)(arg));
409: }
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