Annotation of sys/arch/hp300/dev/hpib.c, Revision 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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